kernel/net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  * Copyright (C) 2015 Intel Deutschland GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/crc32.h>
  24 #include <linux/slab.h>
  25 #include <linux/export.h>
  26 #include <net/mac80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "led.h"
  33
  34 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  35 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  36 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  37 #define IEEE80211_AUTH_MAX_TRIES        3
  38 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  39 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  40 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  41 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  42 #define IEEE80211_ASSOC_MAX_TRIES       3
  43
  44 static int max_nullfunc_tries = 2;
  45 module_param(max_nullfunc_tries, int, 0644);
  46 MODULE_PARM_DESC(max_nullfunc_tries,
  47                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  48
  49 static int max_probe_tries = 5;
  50 module_param(max_probe_tries, int, 0644);
  51 MODULE_PARM_DESC(max_probe_tries,
  52                  "Maximum probe tries before disconnecting (reason 4).");
  53
  54 /*
  55  * Beacon loss timeout is calculated as N frames times the
  56  * advertised beacon interval.  This may need to be somewhat
  57  * higher than what hardware might detect to account for
  58  * delays in the host processing frames. But since we also
  59  * probe on beacon miss before declaring the connection lost
  60  * default to what we want.
  61  */
  62 static int beacon_loss_count = 7;
  63 module_param(beacon_loss_count, int, 0644);
  64 MODULE_PARM_DESC(beacon_loss_count,
  65                  "Number of beacon intervals before we decide beacon was lost.");
  66
  67 /*
  68  * Time the connection can be idle before we probe
  69  * it to see if we can still talk to the AP.
  70  */
  71 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  72 /*
  73  * Time we wait for a probe response after sending
  74  * a probe request because of beacon loss or for
  75  * checking the connection still works.
  76  */
  77 static int probe_wait_ms = 500;
  78 module_param(probe_wait_ms, int, 0644);
  79 MODULE_PARM_DESC(probe_wait_ms,
  80                  "Maximum time(ms) to wait for probe response"
  81                  " before disconnecting (reason 4).");
  82
  83 /*
  84  * How many Beacon frames need to have been used in average signal strength
  85  * before starting to indicate signal change events.
  86  */
  87 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  88
  89 /*
  90  * We can have multiple work items (and connection probing)
  91  * scheduling this timer, but we need to take care to only
  92  * reschedule it when it should fire _earlier_ than it was
  93  * asked for before, or if it's not pending right now. This
  94  * function ensures that. Note that it then is required to
  95  * run this function for all timeouts after the first one
  96  * has happened -- the work that runs from this timer will
  97  * do that.
  98  */
  99 static void run_again(struct ieee80211_sub_if_data *sdata,
 100                       unsigned long timeout)
 101 {
 102         sdata_assert_lock(sdata);
 103
 104         if (!timer_pending(&sdata->u.mgd.timer) ||
 105             time_before(timeout, sdata->u.mgd.timer.expires))
 106                 mod_timer(&sdata->u.mgd.timer, timeout);
 107 }
 108
 109 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 110 {
 111         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 112                 return;
 113
 114         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 119 }
 120
 121 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 122 {
 123         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 124
 125         if (unlikely(!sdata->u.mgd.associated))
 126                 return;
 127
 128         ifmgd->probe_send_count = 0;
 129
 130         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 131                 return;
 132
 133         mod_timer(&sdata->u.mgd.conn_mon_timer,
 134                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 135 }
 136
 137 static int ecw2cw(int ecw)
 138 {
 139         return (1 << ecw) - 1;
 140 }
 141
 142 static u32
 143 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 144                              struct ieee80211_supported_band *sband,
 145                              struct ieee80211_channel *channel,
 146                              const struct ieee80211_ht_cap *ht_cap,
 147                              const struct ieee80211_ht_operation *ht_oper,
 148                              const struct ieee80211_vht_operation *vht_oper,
 149                              struct cfg80211_chan_def *chandef, bool tracking)
 150 {
 151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 152         struct cfg80211_chan_def vht_chandef;
 153         struct ieee80211_sta_ht_cap sta_ht_cap;
 154         u32 ht_cfreq, ret;
 155
 156         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 157         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 158
 159         chandef->chan = channel;
 160         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 161         chandef->center_freq1 = channel->center_freq;
 162         chandef->center_freq2 = 0;
 163
 164         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 165                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 166                 goto out;
 167         }
 168
 169         chandef->width = NL80211_CHAN_WIDTH_20;
 170
 171         if (!(ht_cap->cap_info &
 172               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 173                 ret = IEEE80211_STA_DISABLE_40MHZ;
 174                 vht_chandef = *chandef;
 175                 goto out;
 176         }
 177
 178         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 179                                                   channel->band);
 180         /* check that channel matches the right operating channel */
 181         if (!tracking && channel->center_freq != ht_cfreq) {
 182                 /*
 183                  * It's possible that some APs are confused here;
 184                  * Netgear WNDR3700 sometimes reports 4 higher than
 185                  * the actual channel in association responses, but
 186                  * since we look at probe response/beacon data here
 187                  * it should be OK.
 188                  */
 189                 sdata_info(sdata,
 190                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 191                            channel->center_freq, ht_cfreq,
 192                            ht_oper->primary_chan, channel->band);
 193                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 194                 goto out;
 195         }
 196
 197         /* check 40 MHz support, if we have it */
 198         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 199                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 200                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 201                         chandef->width = NL80211_CHAN_WIDTH_40;
 202                         chandef->center_freq1 += 10;
 203                         break;
 204                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 205                         chandef->width = NL80211_CHAN_WIDTH_40;
 206                         chandef->center_freq1 -= 10;
 207                         break;
 208                 }
 209         } else {
 210                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 211                 ret = IEEE80211_STA_DISABLE_VHT;
 212                 /* also mark 40 MHz disabled */
 213                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 214                 goto out;
 215         }
 216
 217         if (!vht_oper || !sband->vht_cap.vht_supported) {
 218                 ret = IEEE80211_STA_DISABLE_VHT;
 219                 goto out;
 220         }
 221
 222         vht_chandef.chan = channel;
 223         vht_chandef.center_freq1 =
 224                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 225                                                channel->band);
 226         vht_chandef.center_freq2 = 0;
 227
 228         switch (vht_oper->chan_width) {
 229         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 230                 vht_chandef.width = chandef->width;
 231                 vht_chandef.center_freq1 = chandef->center_freq1;
 232                 break;
 233         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 234                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 235                 break;
 236         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 237                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 238                 break;
 239         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 240                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 241                 vht_chandef.center_freq2 =
 242                         ieee80211_channel_to_frequency(
 243                                 vht_oper->center_freq_seg2_idx,
 244                                 channel->band);
 245                 break;
 246         default:
 247                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 248                         sdata_info(sdata,
 249                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 250                                    vht_oper->chan_width);
 251                 ret = IEEE80211_STA_DISABLE_VHT;
 252                 goto out;
 253         }
 254
 255         if (!cfg80211_chandef_valid(&vht_chandef)) {
 256                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 257                         sdata_info(sdata,
 258                                    "AP VHT information is invalid, disable VHT\n");
 259                 ret = IEEE80211_STA_DISABLE_VHT;
 260                 goto out;
 261         }
 262
 263         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 264                 ret = 0;
 265                 goto out;
 266         }
 267
 268         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 269                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 270                         sdata_info(sdata,
 271                                    "AP VHT information doesn't match HT, disable VHT\n");
 272                 ret = IEEE80211_STA_DISABLE_VHT;
 273                 goto out;
 274         }
 275
 276         *chandef = vht_chandef;
 277
 278         ret = 0;
 279
 280 out:
 281         /*
 282          * When tracking the current AP, don't do any further checks if the
 283          * new chandef is identical to the one we're currently using for the
 284          * connection. This keeps us from playing ping-pong with regulatory,
 285          * without it the following can happen (for example):
 286          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 287          *  - AP advertises regdom US
 288          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 289          *  - the code below detects an unsupported channel, downgrades, and
 290          *    we disconnect from the AP in the caller
 291          *  - disconnect causes CRDA to reload world regdomain and the game
 292          *    starts anew.
 293          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 294          *
 295          * It seems possible that there are still scenarios with CSA or real
 296          * bandwidth changes where a this could happen, but those cases are
 297          * less common and wouldn't completely prevent using the AP.
 298          */
 299         if (tracking &&
 300             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 301                 return ret;
 302
 303         /* don't print the message below for VHT mismatch if VHT is disabled */
 304         if (ret & IEEE80211_STA_DISABLE_VHT)
 305                 vht_chandef = *chandef;
 306
 307         /*
 308          * Ignore the DISABLED flag when we're already connected and only
 309          * tracking the APs beacon for bandwidth changes - otherwise we
 310          * might get disconnected here if we connect to an AP, update our
 311          * regulatory information based on the AP's country IE and the
 312          * information we have is wrong/outdated and disables the channel
 313          * that we're actually using for the connection to the AP.
 314          */
 315         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 316                                         tracking ? 0 :
 317                                                    IEEE80211_CHAN_DISABLED)) {
 318                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 319                         ret = IEEE80211_STA_DISABLE_HT |
 320                               IEEE80211_STA_DISABLE_VHT;
 321                         break;
 322                 }
 323
 324                 ret |= ieee80211_chandef_downgrade(chandef);
 325         }
 326
 327         if (chandef->width != vht_chandef.width && !tracking)
 328                 sdata_info(sdata,
 329                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 330
 331         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 332         return ret;
 333 }
 334
 335 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 336                                struct sta_info *sta,
 337                                const struct ieee80211_ht_cap *ht_cap,
 338                                const struct ieee80211_ht_operation *ht_oper,
 339                                const struct ieee80211_vht_operation *vht_oper,
 340                                const u8 *bssid, u32 *changed)
 341 {
 342         struct ieee80211_local *local = sdata->local;
 343         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 344         struct ieee80211_supported_band *sband;
 345         struct ieee80211_channel *chan;
 346         struct cfg80211_chan_def chandef;
 347         u16 ht_opmode;
 348         u32 flags;
 349         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 350         int ret;
 351
 352         /* if HT was/is disabled, don't track any bandwidth changes */
 353         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 354                 return 0;
 355
 356         /* don't check VHT if we associated as non-VHT station */
 357         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 358                 vht_oper = NULL;
 359
 360         if (WARN_ON_ONCE(!sta))
 361                 return -EINVAL;
 362
 363         /*
 364          * if bss configuration changed store the new one -
 365          * this may be applicable even if channel is identical
 366          */
 367         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 368         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 369                 *changed |= BSS_CHANGED_HT;
 370                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 371         }
 372
 373         chan = sdata->vif.bss_conf.chandef.chan;
 374         sband = local->hw.wiphy->bands[chan->band];
 375
 376         /* calculate new channel (type) based on HT/VHT operation IEs */
 377         flags = ieee80211_determine_chantype(sdata, sband, chan,
 378                                              ht_cap, ht_oper, vht_oper,
 379                                              &chandef, true);
 380
 381         /*
 382          * Downgrade the new channel if we associated with restricted
 383          * capabilities. For example, if we associated as a 20 MHz STA
 384          * to a 40 MHz AP (due to regulatory, capabilities or config
 385          * reasons) then switching to a 40 MHz channel now won't do us
 386          * any good -- we couldn't use it with the AP.
 387          */
 388         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 389             chandef.width == NL80211_CHAN_WIDTH_80P80)
 390                 flags |= ieee80211_chandef_downgrade(&chandef);
 391         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 392             chandef.width == NL80211_CHAN_WIDTH_160)
 393                 flags |= ieee80211_chandef_downgrade(&chandef);
 394         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 395             chandef.width > NL80211_CHAN_WIDTH_20)
 396                 flags |= ieee80211_chandef_downgrade(&chandef);
 397
 398         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 399                 return 0;
 400
 401         sdata_info(sdata,
 402                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 403                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 404                    chandef.center_freq1, chandef.center_freq2);
 405
 406         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 407                                       IEEE80211_STA_DISABLE_VHT |
 408                                       IEEE80211_STA_DISABLE_40MHZ |
 409                                       IEEE80211_STA_DISABLE_80P80MHZ |
 410                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 411             !cfg80211_chandef_valid(&chandef)) {
 412                 sdata_info(sdata,
 413                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 414                            ifmgd->bssid);
 415                 return -EINVAL;
 416         }
 417
 418         switch (chandef.width) {
 419         case NL80211_CHAN_WIDTH_20_NOHT:
 420         case NL80211_CHAN_WIDTH_20:
 421                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 422                 break;
 423         case NL80211_CHAN_WIDTH_40:
 424                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 425                 break;
 426         case NL80211_CHAN_WIDTH_80:
 427                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 428                 break;
 429         case NL80211_CHAN_WIDTH_80P80:
 430         case NL80211_CHAN_WIDTH_160:
 431                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 432                 break;
 433         default:
 434                 return -EINVAL;
 435         }
 436
 437         if (new_sta_bw > sta->cur_max_bandwidth)
 438                 new_sta_bw = sta->cur_max_bandwidth;
 439
 440         if (new_sta_bw < sta->sta.bandwidth) {
 441                 sta->sta.bandwidth = new_sta_bw;
 442                 rate_control_rate_update(local, sband, sta,
 443                                          IEEE80211_RC_BW_CHANGED);
 444         }
 445
 446         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 447         if (ret) {
 448                 sdata_info(sdata,
 449                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 450                            ifmgd->bssid);
 451                 return ret;
 452         }
 453
 454         if (new_sta_bw > sta->sta.bandwidth) {
 455                 sta->sta.bandwidth = new_sta_bw;
 456                 rate_control_rate_update(local, sband, sta,
 457                                          IEEE80211_RC_BW_CHANGED);
 458         }
 459
 460         return 0;
 461 }
 462
 463 /* frame sending functions */
 464
 465 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 466                                 struct sk_buff *skb, u8 ap_ht_param,
 467                                 struct ieee80211_supported_band *sband,
 468                                 struct ieee80211_channel *channel,
 469                                 enum ieee80211_smps_mode smps)
 470 {
 471         u8 *pos;
 472         u32 flags = channel->flags;
 473         u16 cap;
 474         struct ieee80211_sta_ht_cap ht_cap;
 475
 476         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 477
 478         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 479         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 480
 481         /* determine capability flags */
 482         cap = ht_cap.cap;
 483
 484         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 485         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 486                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 487                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 488                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 489                 }
 490                 break;
 491         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 492                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 493                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 494                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 495                 }
 496                 break;
 497         }
 498
 499         /*
 500          * If 40 MHz was disabled associate as though we weren't
 501          * capable of 40 MHz -- some broken APs will never fall
 502          * back to trying to transmit in 20 MHz.
 503          */
 504         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 505                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 506                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 507         }
 508
 509         /* set SM PS mode properly */
 510         cap &= ~IEEE80211_HT_CAP_SM_PS;
 511         switch (smps) {
 512         case IEEE80211_SMPS_AUTOMATIC:
 513         case IEEE80211_SMPS_NUM_MODES:
 514                 WARN_ON(1);
 515         case IEEE80211_SMPS_OFF:
 516                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 517                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 518                 break;
 519         case IEEE80211_SMPS_STATIC:
 520                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 521                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 522                 break;
 523         case IEEE80211_SMPS_DYNAMIC:
 524                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 525                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 526                 break;
 527         }
 528
 529         /* reserve and fill IE */
 530         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 531         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 532 }
 533
 534 /* This function determines vht capability flags for the association
 535  * and builds the IE.
 536  * Note - the function may set the owner of the MU-MIMO capability
 537  */
 538 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 539                                  struct sk_buff *skb,
 540                                  struct ieee80211_supported_band *sband,
 541                                  struct ieee80211_vht_cap *ap_vht_cap)
 542 {
 543         struct ieee80211_local *local = sdata->local;
 544         u8 *pos;
 545         u32 cap;
 546         struct ieee80211_sta_vht_cap vht_cap;
 547         u32 mask, ap_bf_sts, our_bf_sts;
 548
 549         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 550
 551         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 552         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 553
 554         /* determine capability flags */
 555         cap = vht_cap.cap;
 556
 557         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 558                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 559
 560                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 561                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 562                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 563                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 564         }
 565
 566         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 567                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 568                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 569         }
 570
 571         /*
 572          * Some APs apparently get confused if our capabilities are better
 573          * than theirs, so restrict what we advertise in the assoc request.
 574          */
 575         if (!(ap_vht_cap->vht_cap_info &
 576                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 577                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 578                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 579         else if (!(ap_vht_cap->vht_cap_info &
 580                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 581                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 582
 583         /*
 584          * If some other vif is using the MU-MIMO capablity we cannot associate
 585          * using MU-MIMO - this will lead to contradictions in the group-id
 586          * mechanism.
 587          * Ownership is defined since association request, in order to avoid
 588          * simultaneous associations with MU-MIMO.
 589          */
 590         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 591                 bool disable_mu_mimo = false;
 592                 struct ieee80211_sub_if_data *other;
 593
 594                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 595                         if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) {
 596                                 disable_mu_mimo = true;
 597                                 break;
 598                         }
 599                 }
 600                 if (disable_mu_mimo)
 601                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 602                 else
 603                         sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER;
 604         }
 605
 606         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 607
 608         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 609         our_bf_sts = cap & mask;
 610
 611         if (ap_bf_sts < our_bf_sts) {
 612                 cap &= ~mask;
 613                 cap |= ap_bf_sts;
 614         }
 615
 616         /* reserve and fill IE */
 617         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 618         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 619 }
 620
 621 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 622 {
 623         struct ieee80211_local *local = sdata->local;
 624         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 625         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 626         struct sk_buff *skb;
 627         struct ieee80211_mgmt *mgmt;
 628         u8 *pos, qos_info;
 629         size_t offset = 0, noffset;
 630         int i, count, rates_len, supp_rates_len, shift;
 631         u16 capab;
 632         struct ieee80211_supported_band *sband;
 633         struct ieee80211_chanctx_conf *chanctx_conf;
 634         struct ieee80211_channel *chan;
 635         u32 rate_flags, rates = 0;
 636
 637         sdata_assert_lock(sdata);
 638
 639         rcu_read_lock();
 640         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 641         if (WARN_ON(!chanctx_conf)) {
 642                 rcu_read_unlock();
 643                 return;
 644         }
 645         chan = chanctx_conf->def.chan;
 646         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 647         rcu_read_unlock();
 648         sband = local->hw.wiphy->bands[chan->band];
 649         shift = ieee80211_vif_get_shift(&sdata->vif);
 650
 651         if (assoc_data->supp_rates_len) {
 652                 /*
 653                  * Get all rates supported by the device and the AP as
 654                  * some APs don't like getting a superset of their rates
 655                  * in the association request (e.g. D-Link DAP 1353 in
 656                  * b-only mode)...
 657                  */
 658                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 659                                                      assoc_data->supp_rates,
 660                                                      assoc_data->supp_rates_len,
 661                                                      &rates);
 662         } else {
 663                 /*
 664                  * In case AP not provide any supported rates information
 665                  * before association, we send information element(s) with
 666                  * all rates that we support.
 667                  */
 668                 rates_len = 0;
 669                 for (i = 0; i < sband->n_bitrates; i++) {
 670                         if ((rate_flags & sband->bitrates[i].flags)
 671                             != rate_flags)
 672                                 continue;
 673                         rates |= BIT(i);
 674                         rates_len++;
 675                 }
 676         }
 677
 678         skb = alloc_skb(local->hw.extra_tx_headroom +
 679                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 680                         2 + assoc_data->ssid_len + /* SSID */
 681                         4 + rates_len + /* (extended) rates */
 682                         4 + /* power capability */
 683                         2 + 2 * sband->n_channels + /* supported channels */
 684                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 685                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 686                         assoc_data->ie_len + /* extra IEs */
 687                         9, /* WMM */
 688                         GFP_KERNEL);
 689         if (!skb)
 690                 return;
 691
 692         skb_reserve(skb, local->hw.extra_tx_headroom);
 693
 694         capab = WLAN_CAPABILITY_ESS;
 695
 696         if (sband->band == IEEE80211_BAND_2GHZ) {
 697                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 698                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 699         }
 700
 701         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 702                 capab |= WLAN_CAPABILITY_PRIVACY;
 703
 704         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 705             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 706                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 707
 708         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 709                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 710
 711         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 712         memset(mgmt, 0, 24);
 713         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 714         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 715         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 716
 717         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 718                 skb_put(skb, 10);
 719                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 720                                                   IEEE80211_STYPE_REASSOC_REQ);
 721                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 722                 mgmt->u.reassoc_req.listen_interval =
 723                                 cpu_to_le16(local->hw.conf.listen_interval);
 724                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 725                        ETH_ALEN);
 726         } else {
 727                 skb_put(skb, 4);
 728                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 729                                                   IEEE80211_STYPE_ASSOC_REQ);
 730                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 731                 mgmt->u.assoc_req.listen_interval =
 732                                 cpu_to_le16(local->hw.conf.listen_interval);
 733         }
 734
 735         /* SSID */
 736         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 737         *pos++ = WLAN_EID_SSID;
 738         *pos++ = assoc_data->ssid_len;
 739         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 740
 741         /* add all rates which were marked to be used above */
 742         supp_rates_len = rates_len;
 743         if (supp_rates_len > 8)
 744                 supp_rates_len = 8;
 745
 746         pos = skb_put(skb, supp_rates_len + 2);
 747         *pos++ = WLAN_EID_SUPP_RATES;
 748         *pos++ = supp_rates_len;
 749
 750         count = 0;
 751         for (i = 0; i < sband->n_bitrates; i++) {
 752                 if (BIT(i) & rates) {
 753                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 754                                                 5 * (1 << shift));
 755                         *pos++ = (u8) rate;
 756                         if (++count == 8)
 757                                 break;
 758                 }
 759         }
 760
 761         if (rates_len > count) {
 762                 pos = skb_put(skb, rates_len - count + 2);
 763                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 764                 *pos++ = rates_len - count;
 765
 766                 for (i++; i < sband->n_bitrates; i++) {
 767                         if (BIT(i) & rates) {
 768                                 int rate;
 769                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 770                                                     5 * (1 << shift));
 771                                 *pos++ = (u8) rate;
 772                         }
 773                 }
 774         }
 775
 776         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 777             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 778                 pos = skb_put(skb, 4);
 779                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 780                 *pos++ = 2;
 781                 *pos++ = 0; /* min tx power */
 782                  /* max tx power */
 783                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 784         }
 785
 786         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 787                 /* TODO: get this in reg domain format */
 788                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 789                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 790                 *pos++ = 2 * sband->n_channels;
 791                 for (i = 0; i < sband->n_channels; i++) {
 792                         *pos++ = ieee80211_frequency_to_channel(
 793                                         sband->channels[i].center_freq);
 794                         *pos++ = 1; /* one channel in the subband*/
 795                 }
 796         }
 797
 798         /* if present, add any custom IEs that go before HT */
 799         if (assoc_data->ie_len) {
 800                 static const u8 before_ht[] = {
 801                         WLAN_EID_SSID,
 802                         WLAN_EID_SUPP_RATES,
 803                         WLAN_EID_EXT_SUPP_RATES,
 804                         WLAN_EID_PWR_CAPABILITY,
 805                         WLAN_EID_SUPPORTED_CHANNELS,
 806                         WLAN_EID_RSN,
 807                         WLAN_EID_QOS_CAPA,
 808                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 809                         WLAN_EID_MOBILITY_DOMAIN,
 810                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 811                         WLAN_EID_RIC_DATA,              /* reassoc only */
 812                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 813                 };
 814                 static const u8 after_ric[] = {
 815                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 816                         WLAN_EID_HT_CAPABILITY,
 817                         WLAN_EID_BSS_COEX_2040,
 818                         WLAN_EID_EXT_CAPABILITY,
 819                         WLAN_EID_QOS_TRAFFIC_CAPA,
 820                         WLAN_EID_TIM_BCAST_REQ,
 821                         WLAN_EID_INTERWORKING,
 822                         /* 60GHz doesn't happen right now */
 823                         WLAN_EID_VHT_CAPABILITY,
 824                         WLAN_EID_OPMODE_NOTIF,
 825                 };
 826
 827                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 828                                                  assoc_data->ie_len,
 829                                                  before_ht,
 830                                                  ARRAY_SIZE(before_ht),
 831                                                  after_ric,
 832                                                  ARRAY_SIZE(after_ric),
 833                                                  offset);
 834                 pos = skb_put(skb, noffset - offset);
 835                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 836                 offset = noffset;
 837         }
 838
 839         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 840                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 841                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 842
 843         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 844                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 845                                     sband, chan, sdata->smps_mode);
 846
 847         /* if present, add any custom IEs that go before VHT */
 848         if (assoc_data->ie_len) {
 849                 static const u8 before_vht[] = {
 850                         WLAN_EID_SSID,
 851                         WLAN_EID_SUPP_RATES,
 852                         WLAN_EID_EXT_SUPP_RATES,
 853                         WLAN_EID_PWR_CAPABILITY,
 854                         WLAN_EID_SUPPORTED_CHANNELS,
 855                         WLAN_EID_RSN,
 856                         WLAN_EID_QOS_CAPA,
 857                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 858                         WLAN_EID_MOBILITY_DOMAIN,
 859                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 860                         WLAN_EID_HT_CAPABILITY,
 861                         WLAN_EID_BSS_COEX_2040,
 862                         WLAN_EID_EXT_CAPABILITY,
 863                         WLAN_EID_QOS_TRAFFIC_CAPA,
 864                         WLAN_EID_TIM_BCAST_REQ,
 865                         WLAN_EID_INTERWORKING,
 866                 };
 867
 868                 /* RIC already taken above, so no need to handle here anymore */
 869                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 870                                              before_vht, ARRAY_SIZE(before_vht),
 871                                              offset);
 872                 pos = skb_put(skb, noffset - offset);
 873                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 874                 offset = noffset;
 875         }
 876
 877         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 878                 ieee80211_add_vht_ie(sdata, skb, sband,
 879                                      &assoc_data->ap_vht_cap);
 880
 881         /* if present, add any custom non-vendor IEs that go after HT */
 882         if (assoc_data->ie_len) {
 883                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 884                                                     assoc_data->ie_len,
 885                                                     offset);
 886                 pos = skb_put(skb, noffset - offset);
 887                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 888                 offset = noffset;
 889         }
 890
 891         if (assoc_data->wmm) {
 892                 if (assoc_data->uapsd) {
 893                         qos_info = ifmgd->uapsd_queues;
 894                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 895                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 896                 } else {
 897                         qos_info = 0;
 898                 }
 899
 900                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 901         }
 902
 903         /* add any remaining custom (i.e. vendor specific here) IEs */
 904         if (assoc_data->ie_len) {
 905                 noffset = assoc_data->ie_len;
 906                 pos = skb_put(skb, noffset - offset);
 907                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 908         }
 909
 910         drv_mgd_prepare_tx(local, sdata);
 911
 912         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 913         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 914                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 915                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 916         ieee80211_tx_skb(sdata, skb);
 917 }
 918
 919 void ieee80211_send_pspoll(struct ieee80211_local *local,
 920                            struct ieee80211_sub_if_data *sdata)
 921 {
 922         struct ieee80211_pspoll *pspoll;
 923         struct sk_buff *skb;
 924
 925         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 926         if (!skb)
 927                 return;
 928
 929         pspoll = (struct ieee80211_pspoll *) skb->data;
 930         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 931
 932         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 933         ieee80211_tx_skb(sdata, skb);
 934 }
 935
 936 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 937                              struct ieee80211_sub_if_data *sdata,
 938                              bool powersave)
 939 {
 940         struct sk_buff *skb;
 941         struct ieee80211_hdr_3addr *nullfunc;
 942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 943
 944         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 945         if (!skb)
 946                 return;
 947
 948         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 949         if (powersave)
 950                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 951
 952         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 953                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 954
 955         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 956                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 957
 958         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 959                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 960
 961         ieee80211_tx_skb(sdata, skb);
 962 }
 963
 964 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 965                                           struct ieee80211_sub_if_data *sdata)
 966 {
 967         struct sk_buff *skb;
 968         struct ieee80211_hdr *nullfunc;
 969         __le16 fc;
 970
 971         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 972                 return;
 973
 974         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 975         if (!skb)
 976                 return;
 977
 978         skb_reserve(skb, local->hw.extra_tx_headroom);
 979
 980         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 981         memset(nullfunc, 0, 30);
 982         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 983                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 984         nullfunc->frame_control = fc;
 985         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 986         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 987         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 988         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 989
 990         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 991         ieee80211_tx_skb(sdata, skb);
 992 }
 993
 994 /* spectrum management related things */
 995 static void ieee80211_chswitch_work(struct work_struct *work)
 996 {
 997         struct ieee80211_sub_if_data *sdata =
 998                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 999         struct ieee80211_local *local = sdata->local;
1000         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1001         int ret;
1002
1003         if (!ieee80211_sdata_running(sdata))
1004                 return;
1005
1006         sdata_lock(sdata);
1007         mutex_lock(&local->mtx);
1008         mutex_lock(&local->chanctx_mtx);
1009
1010         if (!ifmgd->associated)
1011                 goto out;
1012
1013         if (!sdata->vif.csa_active)
1014                 goto out;
1015
1016         /*
1017          * using reservation isn't immediate as it may be deferred until later
1018          * with multi-vif. once reservation is complete it will re-schedule the
1019          * work with no reserved_chanctx so verify chandef to check if it
1020          * completed successfully
1021          */
1022
1023         if (sdata->reserved_chanctx) {
1024                 /*
1025                  * with multi-vif csa driver may call ieee80211_csa_finish()
1026                  * many times while waiting for other interfaces to use their
1027                  * reservations
1028                  */
1029                 if (sdata->reserved_ready)
1030                         goto out;
1031
1032                 ret = ieee80211_vif_use_reserved_context(sdata);
1033                 if (ret) {
1034                         sdata_info(sdata,
1035                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1036                                    ret);
1037                         ieee80211_queue_work(&sdata->local->hw,
1038                                              &ifmgd->csa_connection_drop_work);
1039                         goto out;
1040                 }
1041
1042                 goto out;
1043         }
1044
1045         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1046                                         &sdata->csa_chandef)) {
1047                 sdata_info(sdata,
1048                            "failed to finalize channel switch, disconnecting\n");
1049                 ieee80211_queue_work(&sdata->local->hw,
1050                                      &ifmgd->csa_connection_drop_work);
1051                 goto out;
1052         }
1053
1054         /* XXX: shouldn't really modify cfg80211-owned data! */
1055         ifmgd->associated->channel = sdata->csa_chandef.chan;
1056
1057         ifmgd->csa_waiting_bcn = true;
1058
1059         ieee80211_sta_reset_beacon_monitor(sdata);
1060         ieee80211_sta_reset_conn_monitor(sdata);
1061
1062 out:
1063         mutex_unlock(&local->chanctx_mtx);
1064         mutex_unlock(&local->mtx);
1065         sdata_unlock(sdata);
1066 }
1067
1068 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1069 {
1070         struct ieee80211_local *local = sdata->local;
1071         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1072         int ret;
1073
1074         sdata_assert_lock(sdata);
1075
1076         WARN_ON(!sdata->vif.csa_active);
1077
1078         if (sdata->csa_block_tx) {
1079                 ieee80211_wake_vif_queues(local, sdata,
1080                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1081                 sdata->csa_block_tx = false;
1082         }
1083
1084         sdata->vif.csa_active = false;
1085         ifmgd->csa_waiting_bcn = false;
1086
1087         ret = drv_post_channel_switch(sdata);
1088         if (ret) {
1089                 sdata_info(sdata,
1090                            "driver post channel switch failed, disconnecting\n");
1091                 ieee80211_queue_work(&local->hw,
1092                                      &ifmgd->csa_connection_drop_work);
1093                 return;
1094         }
1095
1096         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1097 }
1098
1099 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1100 {
1101         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1102         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1103
1104         trace_api_chswitch_done(sdata, success);
1105         if (!success) {
1106                 sdata_info(sdata,
1107                            "driver channel switch failed, disconnecting\n");
1108                 ieee80211_queue_work(&sdata->local->hw,
1109                                      &ifmgd->csa_connection_drop_work);
1110         } else {
1111                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1112         }
1113 }
1114 EXPORT_SYMBOL(ieee80211_chswitch_done);
1115
1116 static void ieee80211_chswitch_timer(unsigned long data)
1117 {
1118         struct ieee80211_sub_if_data *sdata =
1119                 (struct ieee80211_sub_if_data *) data;
1120
1121         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1122 }
1123
1124 static void
1125 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1126                                  u64 timestamp, u32 device_timestamp,
1127                                  struct ieee802_11_elems *elems,
1128                                  bool beacon)
1129 {
1130         struct ieee80211_local *local = sdata->local;
1131         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1132         struct cfg80211_bss *cbss = ifmgd->associated;
1133         struct ieee80211_chanctx_conf *conf;
1134         struct ieee80211_chanctx *chanctx;
1135         enum ieee80211_band current_band;
1136         struct ieee80211_csa_ie csa_ie;
1137         struct ieee80211_channel_switch ch_switch;
1138         int res;
1139
1140         sdata_assert_lock(sdata);
1141
1142         if (!cbss)
1143                 return;
1144
1145         if (local->scanning)
1146                 return;
1147
1148         /* disregard subsequent announcements if we are already processing */
1149         if (sdata->vif.csa_active)
1150                 return;
1151
1152         current_band = cbss->channel->band;
1153         memset(&csa_ie, 0, sizeof(csa_ie));
1154         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1155                                            ifmgd->flags,
1156                                            ifmgd->associated->bssid, &csa_ie);
1157         if (res < 0)
1158                 ieee80211_queue_work(&local->hw,
1159                                      &ifmgd->csa_connection_drop_work);
1160         if (res)
1161                 return;
1162
1163         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1164                                      IEEE80211_CHAN_DISABLED)) {
1165                 sdata_info(sdata,
1166                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1167                            ifmgd->associated->bssid,
1168                            csa_ie.chandef.chan->center_freq,
1169                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1170                            csa_ie.chandef.center_freq2);
1171                 ieee80211_queue_work(&local->hw,
1172                                      &ifmgd->csa_connection_drop_work);
1173                 return;
1174         }
1175
1176         if (cfg80211_chandef_identical(&csa_ie.chandef,
1177                                        &sdata->vif.bss_conf.chandef)) {
1178                 if (ifmgd->csa_ignored_same_chan)
1179                         return;
1180                 sdata_info(sdata,
1181                            "AP %pM tries to chanswitch to same channel, ignore\n",
1182                            ifmgd->associated->bssid);
1183                 ifmgd->csa_ignored_same_chan = true;
1184                 return;
1185         }
1186
1187         /*
1188          * Drop all TDLS peers - either we disconnect or move to a different
1189          * channel from this point on. There's no telling what our peer will do.
1190          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1191          * have an incompatible wider chandef.
1192          */
1193         ieee80211_teardown_tdls_peers(sdata);
1194
1195         mutex_lock(&local->mtx);
1196         mutex_lock(&local->chanctx_mtx);
1197         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1198                                          lockdep_is_held(&local->chanctx_mtx));
1199         if (!conf) {
1200                 sdata_info(sdata,
1201                            "no channel context assigned to vif?, disconnecting\n");
1202                 goto drop_connection;
1203         }
1204
1205         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1206
1207         if (local->use_chanctx &&
1208             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1209                 sdata_info(sdata,
1210                            "driver doesn't support chan-switch with channel contexts\n");
1211                 goto drop_connection;
1212         }
1213
1214         ch_switch.timestamp = timestamp;
1215         ch_switch.device_timestamp = device_timestamp;
1216         ch_switch.block_tx = csa_ie.mode;
1217         ch_switch.chandef = csa_ie.chandef;
1218         ch_switch.count = csa_ie.count;
1219
1220         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1221                 sdata_info(sdata,
1222                            "preparing for channel switch failed, disconnecting\n");
1223                 goto drop_connection;
1224         }
1225
1226         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1227                                             chanctx->mode, false);
1228         if (res) {
1229                 sdata_info(sdata,
1230                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1231                            res);
1232                 goto drop_connection;
1233         }
1234         mutex_unlock(&local->chanctx_mtx);
1235
1236         sdata->vif.csa_active = true;
1237         sdata->csa_chandef = csa_ie.chandef;
1238         sdata->csa_block_tx = csa_ie.mode;
1239         ifmgd->csa_ignored_same_chan = false;
1240
1241         if (sdata->csa_block_tx)
1242                 ieee80211_stop_vif_queues(local, sdata,
1243                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1244         mutex_unlock(&local->mtx);
1245
1246         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1247                                           csa_ie.count);
1248
1249         if (local->ops->channel_switch) {
1250                 /* use driver's channel switch callback */
1251                 drv_channel_switch(local, sdata, &ch_switch);
1252                 return;
1253         }
1254
1255         /* channel switch handled in software */
1256         if (csa_ie.count <= 1)
1257                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1258         else
1259                 mod_timer(&ifmgd->chswitch_timer,
1260                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1261                                          cbss->beacon_interval));
1262         return;
1263  drop_connection:
1264         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1265         mutex_unlock(&local->chanctx_mtx);
1266         mutex_unlock(&local->mtx);
1267 }
1268
1269 static bool
1270 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1271                                  struct ieee80211_channel *channel,
1272                                  const u8 *country_ie, u8 country_ie_len,
1273                                  const u8 *pwr_constr_elem,
1274                                  int *chan_pwr, int *pwr_reduction)
1275 {
1276         struct ieee80211_country_ie_triplet *triplet;
1277         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1278         int i, chan_increment;
1279         bool have_chan_pwr = false;
1280
1281         /* Invalid IE */
1282         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1283                 return false;
1284
1285         triplet = (void *)(country_ie + 3);
1286         country_ie_len -= 3;
1287
1288         switch (channel->band) {
1289         default:
1290                 WARN_ON_ONCE(1);
1291                 /* fall through */
1292         case IEEE80211_BAND_2GHZ:
1293         case IEEE80211_BAND_60GHZ:
1294                 chan_increment = 1;
1295                 break;
1296         case IEEE80211_BAND_5GHZ:
1297                 chan_increment = 4;
1298                 break;
1299         }
1300
1301         /* find channel */
1302         while (country_ie_len >= 3) {
1303                 u8 first_channel = triplet->chans.first_channel;
1304
1305                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1306                         goto next;
1307
1308                 for (i = 0; i < triplet->chans.num_channels; i++) {
1309                         if (first_channel + i * chan_increment == chan) {
1310                                 have_chan_pwr = true;
1311                                 *chan_pwr = triplet->chans.max_power;
1312                                 break;
1313                         }
1314                 }
1315                 if (have_chan_pwr)
1316                         break;
1317
1318  next:
1319                 triplet++;
1320                 country_ie_len -= 3;
1321         }
1322
1323         if (have_chan_pwr && pwr_constr_elem)
1324                 *pwr_reduction = *pwr_constr_elem;
1325         else
1326                 *pwr_reduction = 0;
1327
1328         return have_chan_pwr;
1329 }
1330
1331 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1332                                       struct ieee80211_channel *channel,
1333                                       const u8 *cisco_dtpc_ie,
1334                                       int *pwr_level)
1335 {
1336         /* From practical testing, the first data byte of the DTPC element
1337          * seems to contain the requested dBm level, and the CLI on Cisco
1338          * APs clearly state the range is -127 to 127 dBm, which indicates
1339          * a signed byte, although it seemingly never actually goes negative.
1340          * The other byte seems to always be zero.
1341          */
1342         *pwr_level = (__s8)cisco_dtpc_ie[4];
1343 }
1344
1345 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1346                                        struct ieee80211_channel *channel,
1347                                        struct ieee80211_mgmt *mgmt,
1348                                        const u8 *country_ie, u8 country_ie_len,
1349                                        const u8 *pwr_constr_ie,
1350                                        const u8 *cisco_dtpc_ie)
1351 {
1352         bool has_80211h_pwr = false, has_cisco_pwr = false;
1353         int chan_pwr = 0, pwr_reduction_80211h = 0;
1354         int pwr_level_cisco, pwr_level_80211h;
1355         int new_ap_level;
1356         __le16 capab = mgmt->u.probe_resp.capab_info;
1357
1358         if (country_ie &&
1359             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1360              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1361                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1362                         sdata, channel, country_ie, country_ie_len,
1363                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1364                 pwr_level_80211h =
1365                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1366         }
1367
1368         if (cisco_dtpc_ie) {
1369                 ieee80211_find_cisco_dtpc(
1370                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1371                 has_cisco_pwr = true;
1372         }
1373
1374         if (!has_80211h_pwr && !has_cisco_pwr)
1375                 return 0;
1376
1377         /* If we have both 802.11h and Cisco DTPC, apply both limits
1378          * by picking the smallest of the two power levels advertised.
1379          */
1380         if (has_80211h_pwr &&
1381             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1382                 new_ap_level = pwr_level_80211h;
1383
1384                 if (sdata->ap_power_level == new_ap_level)
1385                         return 0;
1386
1387                 sdata_dbg(sdata,
1388                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1389                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1390                           sdata->u.mgd.bssid);
1391         } else {  /* has_cisco_pwr is always true here. */
1392                 new_ap_level = pwr_level_cisco;
1393
1394                 if (sdata->ap_power_level == new_ap_level)
1395                         return 0;
1396
1397                 sdata_dbg(sdata,
1398                           "Limiting TX power to %d dBm as advertised by %pM\n",
1399                           pwr_level_cisco, sdata->u.mgd.bssid);
1400         }
1401
1402         sdata->ap_power_level = new_ap_level;
1403         if (__ieee80211_recalc_txpower(sdata))
1404                 return BSS_CHANGED_TXPOWER;
1405         return 0;
1406 }
1407
1408 /* powersave */
1409 static void ieee80211_enable_ps(struct ieee80211_local *local,
1410                                 struct ieee80211_sub_if_data *sdata)
1411 {
1412         struct ieee80211_conf *conf = &local->hw.conf;
1413
1414         /*
1415          * If we are scanning right now then the parameters will
1416          * take effect when scan finishes.
1417          */
1418         if (local->scanning)
1419                 return;
1420
1421         if (conf->dynamic_ps_timeout > 0 &&
1422             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1423                 mod_timer(&local->dynamic_ps_timer, jiffies +
1424                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1425         } else {
1426                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1427                         ieee80211_send_nullfunc(local, sdata, true);
1428
1429                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1430                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1431                         return;
1432
1433                 conf->flags |= IEEE80211_CONF_PS;
1434                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1435         }
1436 }
1437
1438 static void ieee80211_change_ps(struct ieee80211_local *local)
1439 {
1440         struct ieee80211_conf *conf = &local->hw.conf;
1441
1442         if (local->ps_sdata) {
1443                 ieee80211_enable_ps(local, local->ps_sdata);
1444         } else if (conf->flags & IEEE80211_CONF_PS) {
1445                 conf->flags &= ~IEEE80211_CONF_PS;
1446                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1447                 del_timer_sync(&local->dynamic_ps_timer);
1448                 cancel_work_sync(&local->dynamic_ps_enable_work);
1449         }
1450 }
1451
1452 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1453 {
1454         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1455         struct sta_info *sta = NULL;
1456         bool authorized = false;
1457
1458         if (!mgd->powersave)
1459                 return false;
1460
1461         if (mgd->broken_ap)
1462                 return false;
1463
1464         if (!mgd->associated)
1465                 return false;
1466
1467         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1468                 return false;
1469
1470         if (!mgd->have_beacon)
1471                 return false;
1472
1473         rcu_read_lock();
1474         sta = sta_info_get(sdata, mgd->bssid);
1475         if (sta)
1476                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1477         rcu_read_unlock();
1478
1479         return authorized;
1480 }
1481
1482 /* need to hold RTNL or interface lock */
1483 void ieee80211_recalc_ps(struct ieee80211_local *local)
1484 {
1485         struct ieee80211_sub_if_data *sdata, *found = NULL;
1486         int count = 0;
1487         int timeout;
1488
1489         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1490                 local->ps_sdata = NULL;
1491                 return;
1492         }
1493
1494         list_for_each_entry(sdata, &local->interfaces, list) {
1495                 if (!ieee80211_sdata_running(sdata))
1496                         continue;
1497                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1498                         /* If an AP vif is found, then disable PS
1499                          * by setting the count to zero thereby setting
1500                          * ps_sdata to NULL.
1501                          */
1502                         count = 0;
1503                         break;
1504                 }
1505                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1506                         continue;
1507                 found = sdata;
1508                 count++;
1509         }
1510
1511         if (count == 1 && ieee80211_powersave_allowed(found)) {
1512                 u8 dtimper = found->u.mgd.dtim_period;
1513                 s32 beaconint_us;
1514
1515                 beaconint_us = ieee80211_tu_to_usec(
1516                                         found->vif.bss_conf.beacon_int);
1517
1518                 timeout = local->dynamic_ps_forced_timeout;
1519                 if (timeout < 0)
1520                         timeout = 100;
1521                 local->hw.conf.dynamic_ps_timeout = timeout;
1522
1523                 /* If the TIM IE is invalid, pretend the value is 1 */
1524                 if (!dtimper)
1525                         dtimper = 1;
1526
1527                 local->hw.conf.ps_dtim_period = dtimper;
1528                 local->ps_sdata = found;
1529         } else {
1530                 local->ps_sdata = NULL;
1531         }
1532
1533         ieee80211_change_ps(local);
1534 }
1535
1536 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1537 {
1538         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1539
1540         if (sdata->vif.bss_conf.ps != ps_allowed) {
1541                 sdata->vif.bss_conf.ps = ps_allowed;
1542                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1543         }
1544 }
1545
1546 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1547 {
1548         struct ieee80211_local *local =
1549                 container_of(work, struct ieee80211_local,
1550                              dynamic_ps_disable_work);
1551
1552         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1553                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1554                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1555         }
1556
1557         ieee80211_wake_queues_by_reason(&local->hw,
1558                                         IEEE80211_MAX_QUEUE_MAP,
1559                                         IEEE80211_QUEUE_STOP_REASON_PS,
1560                                         false);
1561 }
1562
1563 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1564 {
1565         struct ieee80211_local *local =
1566                 container_of(work, struct ieee80211_local,
1567                              dynamic_ps_enable_work);
1568         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1569         struct ieee80211_if_managed *ifmgd;
1570         unsigned long flags;
1571         int q;
1572
1573         /* can only happen when PS was just disabled anyway */
1574         if (!sdata)
1575                 return;
1576
1577         ifmgd = &sdata->u.mgd;
1578
1579         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1580                 return;
1581
1582         if (local->hw.conf.dynamic_ps_timeout > 0) {
1583                 /* don't enter PS if TX frames are pending */
1584                 if (drv_tx_frames_pending(local)) {
1585                         mod_timer(&local->dynamic_ps_timer, jiffies +
1586                                   msecs_to_jiffies(
1587                                   local->hw.conf.dynamic_ps_timeout));
1588                         return;
1589                 }
1590
1591                 /*
1592                  * transmission can be stopped by others which leads to
1593                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1594                  * is not the actual idle state.
1595                  */
1596                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1597                 for (q = 0; q < local->hw.queues; q++) {
1598                         if (local->queue_stop_reasons[q]) {
1599                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1600                                                        flags);
1601                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1602                                           msecs_to_jiffies(
1603                                           local->hw.conf.dynamic_ps_timeout));
1604                                 return;
1605                         }
1606                 }
1607                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1608         }
1609
1610         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1611             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1612                 if (drv_tx_frames_pending(local)) {
1613                         mod_timer(&local->dynamic_ps_timer, jiffies +
1614                                   msecs_to_jiffies(
1615                                   local->hw.conf.dynamic_ps_timeout));
1616                 } else {
1617                         ieee80211_send_nullfunc(local, sdata, true);
1618                         /* Flush to get the tx status of nullfunc frame */
1619                         ieee80211_flush_queues(local, sdata, false);
1620                 }
1621         }
1622
1623         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1624               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1625             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1626                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1627                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1628                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1629         }
1630 }
1631
1632 void ieee80211_dynamic_ps_timer(unsigned long data)
1633 {
1634         struct ieee80211_local *local = (void *) data;
1635
1636         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1637 }
1638
1639 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1640 {
1641         struct delayed_work *delayed_work =
1642                 container_of(work, struct delayed_work, work);
1643         struct ieee80211_sub_if_data *sdata =
1644                 container_of(delayed_work, struct ieee80211_sub_if_data,
1645                              dfs_cac_timer_work);
1646         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1647
1648         mutex_lock(&sdata->local->mtx);
1649         if (sdata->wdev.cac_started) {
1650                 ieee80211_vif_release_channel(sdata);
1651                 cfg80211_cac_event(sdata->dev, &chandef,
1652                                    NL80211_RADAR_CAC_FINISHED,
1653                                    GFP_KERNEL);
1654         }
1655         mutex_unlock(&sdata->local->mtx);
1656 }
1657
1658 static bool
1659 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1660 {
1661         struct ieee80211_local *local = sdata->local;
1662         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1663         bool ret = false;
1664         int ac;
1665
1666         if (local->hw.queues < IEEE80211_NUM_ACS)
1667                 return false;
1668
1669         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1670                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1671                 int non_acm_ac;
1672                 unsigned long now = jiffies;
1673
1674                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1675                     tx_tspec->admitted_time &&
1676                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1677                         tx_tspec->consumed_tx_time = 0;
1678                         tx_tspec->time_slice_start = now;
1679
1680                         if (tx_tspec->downgraded)
1681                                 tx_tspec->action =
1682                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1683                 }
1684
1685                 switch (tx_tspec->action) {
1686                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1687                         /* take the original parameters */
1688                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1689                                 sdata_err(sdata,
1690                                           "failed to set TX queue parameters for queue %d\n",
1691                                           ac);
1692                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1693                         tx_tspec->downgraded = false;
1694                         ret = true;
1695                         break;
1696                 case TX_TSPEC_ACTION_DOWNGRADE:
1697                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1698                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1699                                 ret = true;
1700                                 break;
1701                         }
1702                         /* downgrade next lower non-ACM AC */
1703                         for (non_acm_ac = ac + 1;
1704                              non_acm_ac < IEEE80211_NUM_ACS;
1705                              non_acm_ac++)
1706                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1707                                         break;
1708                         /* The loop will result in using BK even if it requires
1709                          * admission control, such configuration makes no sense
1710                          * and we have to transmit somehow - the AC selection
1711                          * does the same thing.
1712                          */
1713                         if (drv_conf_tx(local, sdata, ac,
1714                                         &sdata->tx_conf[non_acm_ac]))
1715                                 sdata_err(sdata,
1716                                           "failed to set TX queue parameters for queue %d\n",
1717                                           ac);
1718                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1719                         ret = true;
1720                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1721                                 tx_tspec->time_slice_start + HZ - now + 1);
1722                         break;
1723                 case TX_TSPEC_ACTION_NONE:
1724                         /* nothing now */
1725                         break;
1726                 }
1727         }
1728
1729         return ret;
1730 }
1731
1732 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1733 {
1734         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1735                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1736 }
1737
1738 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1739 {
1740         struct ieee80211_sub_if_data *sdata;
1741
1742         sdata = container_of(work, struct ieee80211_sub_if_data,
1743                              u.mgd.tx_tspec_wk.work);
1744         ieee80211_sta_handle_tspec_ac_params(sdata);
1745 }
1746
1747 /* MLME */
1748 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1749                                      struct ieee80211_sub_if_data *sdata,
1750                                      const u8 *wmm_param, size_t wmm_param_len)
1751 {
1752         struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1753         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1754         size_t left;
1755         int count, ac;
1756         const u8 *pos;
1757         u8 uapsd_queues = 0;
1758
1759         if (!local->ops->conf_tx)
1760                 return false;
1761
1762         if (local->hw.queues < IEEE80211_NUM_ACS)
1763                 return false;
1764
1765         if (!wmm_param)
1766                 return false;
1767
1768         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1769                 return false;
1770
1771         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1772                 uapsd_queues = ifmgd->uapsd_queues;
1773
1774         count = wmm_param[6] & 0x0f;
1775         if (count == ifmgd->wmm_last_param_set)
1776                 return false;
1777         ifmgd->wmm_last_param_set = count;
1778
1779         pos = wmm_param + 8;
1780         left = wmm_param_len - 8;
1781
1782         memset(&params, 0, sizeof(params));
1783
1784         sdata->wmm_acm = 0;
1785         for (; left >= 4; left -= 4, pos += 4) {
1786                 int aci = (pos[0] >> 5) & 0x03;
1787                 int acm = (pos[0] >> 4) & 0x01;
1788                 bool uapsd = false;
1789
1790                 switch (aci) {
1791                 case 1: /* AC_BK */
1792                         ac = IEEE80211_AC_BK;
1793                         if (acm)
1794                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1795                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1796                                 uapsd = true;
1797                         break;
1798                 case 2: /* AC_VI */
1799                         ac = IEEE80211_AC_VI;
1800                         if (acm)
1801                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1802                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1803                                 uapsd = true;
1804                         break;
1805                 case 3: /* AC_VO */
1806                         ac = IEEE80211_AC_VO;
1807                         if (acm)
1808                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1809                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1810                                 uapsd = true;
1811                         break;
1812                 case 0: /* AC_BE */
1813                 default:
1814                         ac = IEEE80211_AC_BE;
1815                         if (acm)
1816                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1817                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1818                                 uapsd = true;
1819                         break;
1820                 }
1821
1822                 params[ac].aifs = pos[0] & 0x0f;
1823
1824                 if (params[ac].aifs < 2) {
1825                         sdata_info(sdata,
1826                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1827                                    params[ac].aifs, aci);
1828                         params[ac].aifs = 2;
1829                 }
1830                 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1831                 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1832                 params[ac].txop = get_unaligned_le16(pos + 2);
1833                 params[ac].acm = acm;
1834                 params[ac].uapsd = uapsd;
1835
1836                 if (params[ac].cw_min > params[ac].cw_max) {
1837                         sdata_info(sdata,
1838                                    "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1839                                    params[ac].cw_min, params[ac].cw_max, aci);
1840                         return false;
1841                 }
1842         }
1843
1844         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1845                 mlme_dbg(sdata,
1846                          "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1847                          ac, params[ac].acm,
1848                          params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1849                          params[ac].txop, params[ac].uapsd,
1850                          ifmgd->tx_tspec[ac].downgraded);
1851                 sdata->tx_conf[ac] = params[ac];
1852                 if (!ifmgd->tx_tspec[ac].downgraded &&
1853                     drv_conf_tx(local, sdata, ac, &params[ac]))
1854                         sdata_err(sdata,
1855                                   "failed to set TX queue parameters for AC %d\n",
1856                                   ac);
1857         }
1858
1859         /* enable WMM or activate new settings */
1860         sdata->vif.bss_conf.qos = true;
1861         return true;
1862 }
1863
1864 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1865 {
1866         lockdep_assert_held(&sdata->local->mtx);
1867
1868         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1869         ieee80211_run_deferred_scan(sdata->local);
1870 }
1871
1872 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1873 {
1874         mutex_lock(&sdata->local->mtx);
1875         __ieee80211_stop_poll(sdata);
1876         mutex_unlock(&sdata->local->mtx);
1877 }
1878
1879 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1880                                            u16 capab, bool erp_valid, u8 erp)
1881 {
1882         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1883         u32 changed = 0;
1884         bool use_protection;
1885         bool use_short_preamble;
1886         bool use_short_slot;
1887
1888         if (erp_valid) {
1889                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1890                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1891         } else {
1892                 use_protection = false;
1893                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1894         }
1895
1896         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1897         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1898                 use_short_slot = true;
1899
1900         if (use_protection != bss_conf->use_cts_prot) {
1901                 bss_conf->use_cts_prot = use_protection;
1902                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1903         }
1904
1905         if (use_short_preamble != bss_conf->use_short_preamble) {
1906                 bss_conf->use_short_preamble = use_short_preamble;
1907                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1908         }
1909
1910         if (use_short_slot != bss_conf->use_short_slot) {
1911                 bss_conf->use_short_slot = use_short_slot;
1912                 changed |= BSS_CHANGED_ERP_SLOT;
1913         }
1914
1915         return changed;
1916 }
1917
1918 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1919                                      struct cfg80211_bss *cbss,
1920                                      u32 bss_info_changed)
1921 {
1922         struct ieee80211_bss *bss = (void *)cbss->priv;
1923         struct ieee80211_local *local = sdata->local;
1924         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1925
1926         bss_info_changed |= BSS_CHANGED_ASSOC;
1927         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1928                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1929
1930         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1931                 beacon_loss_count * bss_conf->beacon_int));
1932
1933         sdata->u.mgd.associated = cbss;
1934         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1935
1936         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1937
1938         if (sdata->vif.p2p) {
1939                 const struct cfg80211_bss_ies *ies;
1940
1941                 rcu_read_lock();
1942                 ies = rcu_dereference(cbss->ies);
1943                 if (ies) {
1944                         int ret;
1945
1946                         ret = cfg80211_get_p2p_attr(
1947                                         ies->data, ies->len,
1948                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1949                                         (u8 *) &bss_conf->p2p_noa_attr,
1950                                         sizeof(bss_conf->p2p_noa_attr));
1951                         if (ret >= 2) {
1952                                 sdata->u.mgd.p2p_noa_index =
1953                                         bss_conf->p2p_noa_attr.index;
1954                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1955                         }
1956                 }
1957                 rcu_read_unlock();
1958         }
1959
1960         /* just to be sure */
1961         ieee80211_stop_poll(sdata);
1962
1963         ieee80211_led_assoc(local, 1);
1964
1965         if (sdata->u.mgd.have_beacon) {
1966                 /*
1967                  * If the AP is buggy we may get here with no DTIM period
1968                  * known, so assume it's 1 which is the only safe assumption
1969                  * in that case, although if the TIM IE is broken powersave
1970                  * probably just won't work at all.
1971                  */
1972                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1973                 bss_conf->beacon_rate = bss->beacon_rate;
1974                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1975         } else {
1976                 bss_conf->beacon_rate = NULL;
1977                 bss_conf->dtim_period = 0;
1978         }
1979
1980         bss_conf->assoc = 1;
1981
1982         /* Tell the driver to monitor connection quality (if supported) */
1983         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1984             bss_conf->cqm_rssi_thold)
1985                 bss_info_changed |= BSS_CHANGED_CQM;
1986
1987         /* Enable ARP filtering */
1988         if (bss_conf->arp_addr_cnt)
1989                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1990
1991         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1992
1993         mutex_lock(&local->iflist_mtx);
1994         ieee80211_recalc_ps(local);
1995         mutex_unlock(&local->iflist_mtx);
1996
1997         ieee80211_recalc_smps(sdata);
1998         ieee80211_recalc_ps_vif(sdata);
1999
2000         netif_carrier_on(sdata->dev);
2001 }
2002
2003 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2004                                    u16 stype, u16 reason, bool tx,
2005                                    u8 *frame_buf)
2006 {
2007         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2008         struct ieee80211_local *local = sdata->local;
2009         u32 changed = 0;
2010
2011         sdata_assert_lock(sdata);
2012
2013         if (WARN_ON_ONCE(tx && !frame_buf))
2014                 return;
2015
2016         if (WARN_ON(!ifmgd->associated))
2017                 return;
2018
2019         ieee80211_stop_poll(sdata);
2020
2021         ifmgd->associated = NULL;
2022         netif_carrier_off(sdata->dev);
2023
2024         /*
2025          * if we want to get out of ps before disassoc (why?) we have
2026          * to do it before sending disassoc, as otherwise the null-packet
2027          * won't be valid.
2028          */
2029         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2030                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2031                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2032         }
2033         local->ps_sdata = NULL;
2034
2035         /* disable per-vif ps */
2036         ieee80211_recalc_ps_vif(sdata);
2037
2038         /* make sure ongoing transmission finishes */
2039         synchronize_net();
2040
2041         /*
2042          * drop any frame before deauth/disassoc, this can be data or
2043          * management frame. Since we are disconnecting, we should not
2044          * insist sending these frames which can take time and delay
2045          * the disconnection and possible the roaming.
2046          */
2047         if (tx)
2048                 ieee80211_flush_queues(local, sdata, true);
2049
2050         /* deauthenticate/disassociate now */
2051         if (tx || frame_buf)
2052                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2053                                                reason, tx, frame_buf);
2054
2055         /* flush out frame - make sure the deauth was actually sent */
2056         if (tx)
2057                 ieee80211_flush_queues(local, sdata, false);
2058
2059         /* clear bssid only after building the needed mgmt frames */
2060         eth_zero_addr(ifmgd->bssid);
2061
2062         /* remove AP and TDLS peers */
2063         sta_info_flush(sdata);
2064
2065         /* finally reset all BSS / config parameters */
2066         changed |= ieee80211_reset_erp_info(sdata);
2067
2068         ieee80211_led_assoc(local, 0);
2069         changed |= BSS_CHANGED_ASSOC;
2070         sdata->vif.bss_conf.assoc = false;
2071
2072         ifmgd->p2p_noa_index = -1;
2073         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2074                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2075
2076         /* on the next assoc, re-program HT/VHT parameters */
2077         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2078         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2079         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2080         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2081         sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2082
2083         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2084
2085         del_timer_sync(&local->dynamic_ps_timer);
2086         cancel_work_sync(&local->dynamic_ps_enable_work);
2087
2088         /* Disable ARP filtering */
2089         if (sdata->vif.bss_conf.arp_addr_cnt)
2090                 changed |= BSS_CHANGED_ARP_FILTER;
2091
2092         sdata->vif.bss_conf.qos = false;
2093         changed |= BSS_CHANGED_QOS;
2094
2095         /* The BSSID (not really interesting) and HT changed */
2096         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2097         ieee80211_bss_info_change_notify(sdata, changed);
2098
2099         /* disassociated - set to defaults now */
2100         ieee80211_set_wmm_default(sdata, false, false);
2101
2102         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2103         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2104         del_timer_sync(&sdata->u.mgd.timer);
2105         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2106
2107         sdata->vif.bss_conf.dtim_period = 0;
2108         sdata->vif.bss_conf.beacon_rate = NULL;
2109
2110         ifmgd->have_beacon = false;
2111
2112         ifmgd->flags = 0;
2113         mutex_lock(&local->mtx);
2114         ieee80211_vif_release_channel(sdata);
2115
2116         sdata->vif.csa_active = false;
2117         ifmgd->csa_waiting_bcn = false;
2118         ifmgd->csa_ignored_same_chan = false;
2119         if (sdata->csa_block_tx) {
2120                 ieee80211_wake_vif_queues(local, sdata,
2121                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2122                 sdata->csa_block_tx = false;
2123         }
2124         mutex_unlock(&local->mtx);
2125
2126         /* existing TX TSPEC sessions no longer exist */
2127         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2128         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2129
2130         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2131 }
2132
2133 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2134                              struct ieee80211_hdr *hdr)
2135 {
2136         /*
2137          * We can postpone the mgd.timer whenever receiving unicast frames
2138          * from AP because we know that the connection is working both ways
2139          * at that time. But multicast frames (and hence also beacons) must
2140          * be ignored here, because we need to trigger the timer during
2141          * data idle periods for sending the periodic probe request to the
2142          * AP we're connected to.
2143          */
2144         if (is_multicast_ether_addr(hdr->addr1))
2145                 return;
2146
2147         ieee80211_sta_reset_conn_monitor(sdata);
2148 }
2149
2150 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2151 {
2152         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2153         struct ieee80211_local *local = sdata->local;
2154
2155         mutex_lock(&local->mtx);
2156         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2157                 goto out;
2158
2159         __ieee80211_stop_poll(sdata);
2160
2161         mutex_lock(&local->iflist_mtx);
2162         ieee80211_recalc_ps(local);
2163         mutex_unlock(&local->iflist_mtx);
2164
2165         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2166                 goto out;
2167
2168         /*
2169          * We've received a probe response, but are not sure whether
2170          * we have or will be receiving any beacons or data, so let's
2171          * schedule the timers again, just in case.
2172          */
2173         ieee80211_sta_reset_beacon_monitor(sdata);
2174
2175         mod_timer(&ifmgd->conn_mon_timer,
2176                   round_jiffies_up(jiffies +
2177                                    IEEE80211_CONNECTION_IDLE_TIME));
2178 out:
2179         mutex_unlock(&local->mtx);
2180 }
2181
2182 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2183                                            struct ieee80211_hdr *hdr,
2184                                            u16 tx_time)
2185 {
2186         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2187         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2188         int ac = ieee80211_ac_from_tid(tid);
2189         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2190         unsigned long now = jiffies;
2191
2192         if (likely(!tx_tspec->admitted_time))
2193                 return;
2194
2195         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2196                 tx_tspec->consumed_tx_time = 0;
2197                 tx_tspec->time_slice_start = now;
2198
2199                 if (tx_tspec->downgraded) {
2200                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2201                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2202                 }
2203         }
2204
2205         if (tx_tspec->downgraded)
2206                 return;
2207
2208         tx_tspec->consumed_tx_time += tx_time;
2209
2210         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2211                 tx_tspec->downgraded = true;
2212                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2213                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2214         }
2215 }
2216
2217 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2218                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2219 {
2220         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2221
2222         if (!ieee80211_is_data(hdr->frame_control))
2223             return;
2224
2225         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2226             sdata->u.mgd.probe_send_count > 0) {
2227                 if (ack)
2228                         ieee80211_sta_reset_conn_monitor(sdata);
2229                 else
2230                         sdata->u.mgd.nullfunc_failed = true;
2231                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2232                 return;
2233         }
2234
2235         if (ack)
2236                 ieee80211_sta_reset_conn_monitor(sdata);
2237 }
2238
2239 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2240 {
2241         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2242         const u8 *ssid;
2243         u8 *dst = ifmgd->associated->bssid;
2244         u8 unicast_limit = max(1, max_probe_tries - 3);
2245
2246         /*
2247          * Try sending broadcast probe requests for the last three
2248          * probe requests after the first ones failed since some
2249          * buggy APs only support broadcast probe requests.
2250          */
2251         if (ifmgd->probe_send_count >= unicast_limit)
2252                 dst = NULL;
2253
2254         /*
2255          * When the hardware reports an accurate Tx ACK status, it's
2256          * better to send a nullfunc frame instead of a probe request,
2257          * as it will kick us off the AP quickly if we aren't associated
2258          * anymore. The timeout will be reset if the frame is ACKed by
2259          * the AP.
2260          */
2261         ifmgd->probe_send_count++;
2262
2263         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2264                 ifmgd->nullfunc_failed = false;
2265                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2266         } else {
2267                 int ssid_len;
2268
2269                 rcu_read_lock();
2270                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2271                 if (WARN_ON_ONCE(ssid == NULL))
2272                         ssid_len = 0;
2273                 else
2274                         ssid_len = ssid[1];
2275
2276                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2277                                          ssid + 2, ssid_len, NULL,
2278                                          0, (u32) -1, true, 0,
2279                                          ifmgd->associated->channel, false);
2280                 rcu_read_unlock();
2281         }
2282
2283         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2284         run_again(sdata, ifmgd->probe_timeout);
2285 }
2286
2287 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2288                                    bool beacon)
2289 {
2290         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2291         bool already = false;
2292
2293         if (!ieee80211_sdata_running(sdata))
2294                 return;
2295
2296         sdata_lock(sdata);
2297
2298         if (!ifmgd->associated)
2299                 goto out;
2300
2301         mutex_lock(&sdata->local->mtx);
2302
2303         if (sdata->local->tmp_channel || sdata->local->scanning) {
2304                 mutex_unlock(&sdata->local->mtx);
2305                 goto out;
2306         }
2307
2308         if (beacon) {
2309                 mlme_dbg_ratelimited(sdata,
2310                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2311                                      beacon_loss_count);
2312
2313                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2314         }
2315
2316         /*
2317          * The driver/our work has already reported this event or the
2318          * connection monitoring has kicked in and we have already sent
2319          * a probe request. Or maybe the AP died and the driver keeps
2320          * reporting until we disassociate...
2321          *
2322          * In either case we have to ignore the current call to this
2323          * function (except for setting the correct probe reason bit)
2324          * because otherwise we would reset the timer every time and
2325          * never check whether we received a probe response!
2326          */
2327         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2328                 already = true;
2329
2330         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2331
2332         mutex_unlock(&sdata->local->mtx);
2333
2334         if (already)
2335                 goto out;
2336
2337         mutex_lock(&sdata->local->iflist_mtx);
2338         ieee80211_recalc_ps(sdata->local);
2339         mutex_unlock(&sdata->local->iflist_mtx);
2340
2341         ifmgd->probe_send_count = 0;
2342         ieee80211_mgd_probe_ap_send(sdata);
2343  out:
2344         sdata_unlock(sdata);
2345 }
2346
2347 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2348                                           struct ieee80211_vif *vif)
2349 {
2350         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2351         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2352         struct cfg80211_bss *cbss;
2353         struct sk_buff *skb;
2354         const u8 *ssid;
2355         int ssid_len;
2356
2357         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2358                 return NULL;
2359
2360         sdata_assert_lock(sdata);
2361
2362         if (ifmgd->associated)
2363                 cbss = ifmgd->associated;
2364         else if (ifmgd->auth_data)
2365                 cbss = ifmgd->auth_data->bss;
2366         else if (ifmgd->assoc_data)
2367                 cbss = ifmgd->assoc_data->bss;
2368         else
2369                 return NULL;
2370
2371         rcu_read_lock();
2372         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2373         if (WARN_ON_ONCE(ssid == NULL))
2374                 ssid_len = 0;
2375         else
2376                 ssid_len = ssid[1];
2377
2378         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2379                                         (u32) -1, cbss->channel,
2380                                         ssid + 2, ssid_len,
2381                                         NULL, 0, true);
2382         rcu_read_unlock();
2383
2384         return skb;
2385 }
2386 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2387
2388 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2389                                         const u8 *buf, size_t len, bool tx,
2390                                         u16 reason)
2391 {
2392         struct ieee80211_event event = {
2393                 .type = MLME_EVENT,
2394                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2395                 .u.mlme.reason = reason,
2396         };
2397
2398         if (tx)
2399                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2400         else
2401                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2402
2403         drv_event_callback(sdata->local, sdata, &event);
2404 }
2405
2406 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2407 {
2408         struct ieee80211_local *local = sdata->local;
2409         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2410         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2411
2412         sdata_lock(sdata);
2413         if (!ifmgd->associated) {
2414                 sdata_unlock(sdata);
2415                 return;
2416         }
2417
2418         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2419                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2420                                true, frame_buf);
2421         mutex_lock(&local->mtx);
2422         sdata->vif.csa_active = false;
2423         ifmgd->csa_waiting_bcn = false;
2424         if (sdata->csa_block_tx) {
2425                 ieee80211_wake_vif_queues(local, sdata,
2426                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2427                 sdata->csa_block_tx = false;
2428         }
2429         mutex_unlock(&local->mtx);
2430
2431         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2432                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2433
2434         sdata_unlock(sdata);
2435 }
2436
2437 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2438 {
2439         struct ieee80211_sub_if_data *sdata =
2440                 container_of(work, struct ieee80211_sub_if_data,
2441                              u.mgd.beacon_connection_loss_work);
2442         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2443
2444         if (ifmgd->associated)
2445                 ifmgd->beacon_loss_count++;
2446
2447         if (ifmgd->connection_loss) {
2448                 sdata_info(sdata, "Connection to AP %pM lost\n",
2449                            ifmgd->bssid);
2450                 __ieee80211_disconnect(sdata);
2451         } else {
2452                 ieee80211_mgd_probe_ap(sdata, true);
2453         }
2454 }
2455
2456 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2457 {
2458         struct ieee80211_sub_if_data *sdata =
2459                 container_of(work, struct ieee80211_sub_if_data,
2460                              u.mgd.csa_connection_drop_work);
2461
2462         __ieee80211_disconnect(sdata);
2463 }
2464
2465 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2466 {
2467         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2468         struct ieee80211_hw *hw = &sdata->local->hw;
2469
2470         trace_api_beacon_loss(sdata);
2471
2472         sdata->u.mgd.connection_loss = false;
2473         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2474 }
2475 EXPORT_SYMBOL(ieee80211_beacon_loss);
2476
2477 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2478 {
2479         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2480         struct ieee80211_hw *hw = &sdata->local->hw;
2481
2482         trace_api_connection_loss(sdata);
2483
2484         sdata->u.mgd.connection_loss = true;
2485         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2486 }
2487 EXPORT_SYMBOL(ieee80211_connection_loss);
2488
2489
2490 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2491                                         bool assoc)
2492 {
2493         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2494
2495         sdata_assert_lock(sdata);
2496
2497         if (!assoc) {
2498                 /*
2499                  * we are not authenticated yet, the only timer that could be
2500                  * running is the timeout for the authentication response which
2501                  * which is not relevant anymore.
2502                  */
2503                 del_timer_sync(&sdata->u.mgd.timer);
2504                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2505
2506                 eth_zero_addr(sdata->u.mgd.bssid);
2507                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2508                 sdata->u.mgd.flags = 0;
2509                 mutex_lock(&sdata->local->mtx);
2510                 ieee80211_vif_release_channel(sdata);
2511                 mutex_unlock(&sdata->local->mtx);
2512         }
2513
2514         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2515         kfree(auth_data);
2516         sdata->u.mgd.auth_data = NULL;
2517 }
2518
2519 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2520                                          bool assoc, bool abandon)
2521 {
2522         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2523
2524         sdata_assert_lock(sdata);
2525
2526         if (!assoc) {
2527                 /*
2528                  * we are not associated yet, the only timer that could be
2529                  * running is the timeout for the association response which
2530                  * which is not relevant anymore.
2531                  */
2532                 del_timer_sync(&sdata->u.mgd.timer);
2533                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2534
2535                 eth_zero_addr(sdata->u.mgd.bssid);
2536                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2537                 sdata->u.mgd.flags = 0;
2538                 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2539                 mutex_lock(&sdata->local->mtx);
2540                 ieee80211_vif_release_channel(sdata);
2541                 mutex_unlock(&sdata->local->mtx);
2542
2543                 if (abandon)
2544                         cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2545         }
2546
2547         kfree(assoc_data);
2548         sdata->u.mgd.assoc_data = NULL;
2549 }
2550
2551 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2552                                      struct ieee80211_mgmt *mgmt, size_t len)
2553 {
2554         struct ieee80211_local *local = sdata->local;
2555         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2556         u8 *pos;
2557         struct ieee802_11_elems elems;
2558         u32 tx_flags = 0;
2559
2560         pos = mgmt->u.auth.variable;
2561         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2562         if (!elems.challenge)
2563                 return;
2564         auth_data->expected_transaction = 4;
2565         drv_mgd_prepare_tx(sdata->local, sdata);
2566         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2567                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2568                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2569         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2570                             elems.challenge - 2, elems.challenge_len + 2,
2571                             auth_data->bss->bssid, auth_data->bss->bssid,
2572                             auth_data->key, auth_data->key_len,
2573                             auth_data->key_idx, tx_flags);
2574 }
2575
2576 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2577                                    struct ieee80211_mgmt *mgmt, size_t len)
2578 {
2579         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2580         u8 bssid[ETH_ALEN];
2581         u16 auth_alg, auth_transaction, status_code;
2582         struct sta_info *sta;
2583         struct ieee80211_event event = {
2584                 .type = MLME_EVENT,
2585                 .u.mlme.data = AUTH_EVENT,
2586         };
2587
2588         sdata_assert_lock(sdata);
2589
2590         if (len < 24 + 6)
2591                 return;
2592
2593         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2594                 return;
2595
2596         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2597
2598         if (!ether_addr_equal(bssid, mgmt->bssid))
2599                 return;
2600
2601         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2602         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2603         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2604
2605         if (auth_alg != ifmgd->auth_data->algorithm ||
2606             auth_transaction != ifmgd->auth_data->expected_transaction) {
2607                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2608                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2609                            auth_transaction,
2610                            ifmgd->auth_data->expected_transaction);
2611                 return;
2612         }
2613
2614         if (status_code != WLAN_STATUS_SUCCESS) {
2615                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2616                            mgmt->sa, status_code);
2617                 ieee80211_destroy_auth_data(sdata, false);
2618                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2619                 event.u.mlme.status = MLME_DENIED;
2620                 event.u.mlme.reason = status_code;
2621                 drv_event_callback(sdata->local, sdata, &event);
2622                 return;
2623         }
2624
2625         switch (ifmgd->auth_data->algorithm) {
2626         case WLAN_AUTH_OPEN:
2627         case WLAN_AUTH_LEAP:
2628         case WLAN_AUTH_FT:
2629         case WLAN_AUTH_SAE:
2630                 break;
2631         case WLAN_AUTH_SHARED_KEY:
2632                 if (ifmgd->auth_data->expected_transaction != 4) {
2633                         ieee80211_auth_challenge(sdata, mgmt, len);
2634                         /* need another frame */
2635                         return;
2636                 }
2637                 break;
2638         default:
2639                 WARN_ONCE(1, "invalid auth alg %d",
2640                           ifmgd->auth_data->algorithm);
2641                 return;
2642         }
2643
2644         event.u.mlme.status = MLME_SUCCESS;
2645         drv_event_callback(sdata->local, sdata, &event);
2646         sdata_info(sdata, "authenticated\n");
2647         ifmgd->auth_data->done = true;
2648         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2649         ifmgd->auth_data->timeout_started = true;
2650         run_again(sdata, ifmgd->auth_data->timeout);
2651
2652         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2653             ifmgd->auth_data->expected_transaction != 2) {
2654                 /*
2655                  * Report auth frame to user space for processing since another
2656                  * round of Authentication frames is still needed.
2657                  */
2658                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2659                 return;
2660         }
2661
2662         /* move station state to auth */
2663         mutex_lock(&sdata->local->sta_mtx);
2664         sta = sta_info_get(sdata, bssid);
2665         if (!sta) {
2666                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2667                 goto out_err;
2668         }
2669         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2670                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2671                 goto out_err;
2672         }
2673         mutex_unlock(&sdata->local->sta_mtx);
2674
2675         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2676         return;
2677  out_err:
2678         mutex_unlock(&sdata->local->sta_mtx);
2679         /* ignore frame -- wait for timeout */
2680 }
2681
2682 #define case_WLAN(type) \
2683         case WLAN_REASON_##type: return #type
2684
2685 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2686 {
2687         switch (reason_code) {
2688         case_WLAN(UNSPECIFIED);
2689         case_WLAN(PREV_AUTH_NOT_VALID);
2690         case_WLAN(DEAUTH_LEAVING);
2691         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2692         case_WLAN(DISASSOC_AP_BUSY);
2693         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2694         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2695         case_WLAN(DISASSOC_STA_HAS_LEFT);
2696         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2697         case_WLAN(DISASSOC_BAD_POWER);
2698         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2699         case_WLAN(INVALID_IE);
2700         case_WLAN(MIC_FAILURE);
2701         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2702         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2703         case_WLAN(IE_DIFFERENT);
2704         case_WLAN(INVALID_GROUP_CIPHER);
2705         case_WLAN(INVALID_PAIRWISE_CIPHER);
2706         case_WLAN(INVALID_AKMP);
2707         case_WLAN(UNSUPP_RSN_VERSION);
2708         case_WLAN(INVALID_RSN_IE_CAP);
2709         case_WLAN(IEEE8021X_FAILED);
2710         case_WLAN(CIPHER_SUITE_REJECTED);
2711         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2712         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2713         case_WLAN(DISASSOC_LOW_ACK);
2714         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2715         case_WLAN(QSTA_LEAVE_QBSS);
2716         case_WLAN(QSTA_NOT_USE);
2717         case_WLAN(QSTA_REQUIRE_SETUP);
2718         case_WLAN(QSTA_TIMEOUT);
2719         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2720         case_WLAN(MESH_PEER_CANCELED);
2721         case_WLAN(MESH_MAX_PEERS);
2722         case_WLAN(MESH_CONFIG);
2723         case_WLAN(MESH_CLOSE);
2724         case_WLAN(MESH_MAX_RETRIES);
2725         case_WLAN(MESH_CONFIRM_TIMEOUT);
2726         case_WLAN(MESH_INVALID_GTK);
2727         case_WLAN(MESH_INCONSISTENT_PARAM);
2728         case_WLAN(MESH_INVALID_SECURITY);
2729         case_WLAN(MESH_PATH_ERROR);
2730         case_WLAN(MESH_PATH_NOFORWARD);
2731         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2732         case_WLAN(MAC_EXISTS_IN_MBSS);
2733         case_WLAN(MESH_CHAN_REGULATORY);
2734         case_WLAN(MESH_CHAN);
2735         default: return "<unknown>";
2736         }
2737 }
2738
2739 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2740                                      struct ieee80211_mgmt *mgmt, size_t len)
2741 {
2742         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2743         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2744
2745         sdata_assert_lock(sdata);
2746
2747         if (len < 24 + 2)
2748                 return;
2749
2750         if (ifmgd->associated &&
2751             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2752                 const u8 *bssid = ifmgd->associated->bssid;
2753
2754                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2755                            bssid, reason_code,
2756                            ieee80211_get_reason_code_string(reason_code));
2757
2758                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2759
2760                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2761                                             reason_code);
2762                 return;
2763         }
2764
2765         if (ifmgd->assoc_data &&
2766             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2767                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2768
2769                 sdata_info(sdata,
2770                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2771                            bssid, reason_code,
2772                            ieee80211_get_reason_code_string(reason_code));
2773
2774                 ieee80211_destroy_assoc_data(sdata, false, true);
2775
2776                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2777                 return;
2778         }
2779 }
2780
2781
2782 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2783                                        struct ieee80211_mgmt *mgmt, size_t len)
2784 {
2785         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2786         u16 reason_code;
2787
2788         sdata_assert_lock(sdata);
2789
2790         if (len < 24 + 2)
2791                 return;
2792
2793         if (!ifmgd->associated ||
2794             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2795                 return;
2796
2797         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2798
2799         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2800                    mgmt->sa, reason_code);
2801
2802         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2803
2804         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2805 }
2806
2807 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2808                                 u8 *supp_rates, unsigned int supp_rates_len,
2809                                 u32 *rates, u32 *basic_rates,
2810                                 bool *have_higher_than_11mbit,
2811                                 int *min_rate, int *min_rate_index,
2812                                 int shift, u32 rate_flags)
2813 {
2814         int i, j;
2815
2816         for (i = 0; i < supp_rates_len; i++) {
2817                 int rate = supp_rates[i] & 0x7f;
2818                 bool is_basic = !!(supp_rates[i] & 0x80);
2819
2820                 if ((rate * 5 * (1 << shift)) > 110)
2821                         *have_higher_than_11mbit = true;
2822
2823                 /*
2824                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2825                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2826                  *
2827                  * Note: Even through the membership selector and the basic
2828                  *       rate flag share the same bit, they are not exactly
2829                  *       the same.
2830                  */
2831                 if (!!(supp_rates[i] & 0x80) &&
2832                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2833                         continue;
2834
2835                 for (j = 0; j < sband->n_bitrates; j++) {
2836                         struct ieee80211_rate *br;
2837                         int brate;
2838
2839                         br = &sband->bitrates[j];
2840                         if ((rate_flags & br->flags) != rate_flags)
2841                                 continue;
2842
2843                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2844                         if (brate == rate) {
2845                                 *rates |= BIT(j);
2846                                 if (is_basic)
2847                                         *basic_rates |= BIT(j);
2848                                 if ((rate * 5) < *min_rate) {
2849                                         *min_rate = rate * 5;
2850                                         *min_rate_index = j;
2851                                 }
2852                                 break;
2853                         }
2854                 }
2855         }
2856 }
2857
2858 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2859                                     struct cfg80211_bss *cbss,
2860                                     struct ieee80211_mgmt *mgmt, size_t len)
2861 {
2862         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2863         struct ieee80211_local *local = sdata->local;
2864         struct ieee80211_supported_band *sband;
2865         struct sta_info *sta;
2866         u8 *pos;
2867         u16 capab_info, aid;
2868         struct ieee802_11_elems elems;
2869         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2870         const struct cfg80211_bss_ies *bss_ies = NULL;
2871         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2872         u32 changed = 0;
2873         int err;
2874         bool ret;
2875
2876         /* AssocResp and ReassocResp have identical structure */
2877
2878         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2879         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2880
2881         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2882                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2883                            aid);
2884         aid &= ~(BIT(15) | BIT(14));
2885
2886         ifmgd->broken_ap = false;
2887
2888         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2889                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2890                            aid);
2891                 aid = 0;
2892                 ifmgd->broken_ap = true;
2893         }
2894
2895         pos = mgmt->u.assoc_resp.variable;
2896         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2897
2898         if (!elems.supp_rates) {
2899                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2900                 return false;
2901         }
2902
2903         ifmgd->aid = aid;
2904         ifmgd->tdls_chan_switch_prohibited =
2905                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2906                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2907
2908         /*
2909          * Some APs are erroneously not including some information in their
2910          * (re)association response frames. Try to recover by using the data
2911          * from the beacon or probe response. This seems to afflict mobile
2912          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2913          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2914          */
2915         if ((assoc_data->wmm && !elems.wmm_param) ||
2916             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2917              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2918             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2919              (!elems.vht_cap_elem || !elems.vht_operation))) {
2920                 const struct cfg80211_bss_ies *ies;
2921                 struct ieee802_11_elems bss_elems;
2922
2923                 rcu_read_lock();
2924                 ies = rcu_dereference(cbss->ies);
2925                 if (ies)
2926                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2927                                           GFP_ATOMIC);
2928                 rcu_read_unlock();
2929                 if (!bss_ies)
2930                         return false;
2931
2932                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2933                                        false, &bss_elems);
2934                 if (assoc_data->wmm &&
2935                     !elems.wmm_param && bss_elems.wmm_param) {
2936                         elems.wmm_param = bss_elems.wmm_param;
2937                         sdata_info(sdata,
2938                                    "AP bug: WMM param missing from AssocResp\n");
2939                 }
2940
2941                 /*
2942                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2943                  * have to include the IEs in the (re)association response.
2944                  */
2945                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2946                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2947                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2948                         sdata_info(sdata,
2949                                    "AP bug: HT capability missing from AssocResp\n");
2950                 }
2951                 if (!elems.ht_operation && bss_elems.ht_operation &&
2952                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2953                         elems.ht_operation = bss_elems.ht_operation;
2954                         sdata_info(sdata,
2955                                    "AP bug: HT operation missing from AssocResp\n");
2956                 }
2957                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2958                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2959                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2960                         sdata_info(sdata,
2961                                    "AP bug: VHT capa missing from AssocResp\n");
2962                 }
2963                 if (!elems.vht_operation && bss_elems.vht_operation &&
2964                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2965                         elems.vht_operation = bss_elems.vht_operation;
2966                         sdata_info(sdata,
2967                                    "AP bug: VHT operation missing from AssocResp\n");
2968                 }
2969         }
2970
2971         /*
2972          * We previously checked these in the beacon/probe response, so
2973          * they should be present here. This is just a safety net.
2974          */
2975         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2976             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2977                 sdata_info(sdata,
2978                            "HT AP is missing WMM params or HT capability/operation\n");
2979                 ret = false;
2980                 goto out;
2981         }
2982
2983         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2984             (!elems.vht_cap_elem || !elems.vht_operation)) {
2985                 sdata_info(sdata,
2986                            "VHT AP is missing VHT capability/operation\n");
2987                 ret = false;
2988                 goto out;
2989         }
2990
2991         mutex_lock(&sdata->local->sta_mtx);
2992         /*
2993          * station info was already allocated and inserted before
2994          * the association and should be available to us
2995          */
2996         sta = sta_info_get(sdata, cbss->bssid);
2997         if (WARN_ON(!sta)) {
2998                 mutex_unlock(&sdata->local->sta_mtx);
2999                 ret = false;
3000                 goto out;
3001         }
3002
3003         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
3004
3005         /* Set up internal HT/VHT capabilities */
3006         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3007                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3008                                                   elems.ht_cap_elem, sta);
3009
3010         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3011                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3012                                                     elems.vht_cap_elem, sta);
3013
3014         /*
3015          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3016          * in their association response, so ignore that data for our own
3017          * configuration. If it changed since the last beacon, we'll get the
3018          * next beacon and update then.
3019          */
3020
3021         /*
3022          * If an operating mode notification IE is present, override the
3023          * NSS calculation (that would be done in rate_control_rate_init())
3024          * and use the # of streams from that element.
3025          */
3026         if (elems.opmode_notif &&
3027             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3028                 u8 nss;
3029
3030                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3031                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3032                 nss += 1;
3033                 sta->sta.rx_nss = nss;
3034         }
3035
3036         rate_control_rate_init(sta);
3037
3038         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3039                 set_sta_flag(sta, WLAN_STA_MFP);
3040                 sta->sta.mfp = true;
3041         } else {
3042                 sta->sta.mfp = false;
3043         }
3044
3045         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3046
3047         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3048         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3049                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3050         if (err) {
3051                 sdata_info(sdata,
3052                            "failed to move station %pM to desired state\n",
3053                            sta->sta.addr);
3054                 WARN_ON(__sta_info_destroy(sta));
3055                 mutex_unlock(&sdata->local->sta_mtx);
3056                 ret = false;
3057                 goto out;
3058         }
3059
3060         mutex_unlock(&sdata->local->sta_mtx);
3061
3062         /*
3063          * Always handle WMM once after association regardless
3064          * of the first value the AP uses. Setting -1 here has
3065          * that effect because the AP values is an unsigned
3066          * 4-bit value.
3067          */
3068         ifmgd->wmm_last_param_set = -1;
3069
3070         if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3071                 ieee80211_set_wmm_default(sdata, false, false);
3072         } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3073                                              elems.wmm_param_len)) {
3074                 /* still enable QoS since we might have HT/VHT */
3075                 ieee80211_set_wmm_default(sdata, false, true);
3076                 /* set the disable-WMM flag in this case to disable
3077                  * tracking WMM parameter changes in the beacon if
3078                  * the parameters weren't actually valid. Doing so
3079                  * avoids changing parameters very strangely when
3080                  * the AP is going back and forth between valid and
3081                  * invalid parameters.
3082                  */
3083                 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3084         }
3085         changed |= BSS_CHANGED_QOS;
3086
3087         /* set AID and assoc capability,
3088          * ieee80211_set_associated() will tell the driver */
3089         bss_conf->aid = aid;
3090         bss_conf->assoc_capability = capab_info;
3091         ieee80211_set_associated(sdata, cbss, changed);
3092
3093         /*
3094          * If we're using 4-addr mode, let the AP know that we're
3095          * doing so, so that it can create the STA VLAN on its side
3096          */
3097         if (ifmgd->use_4addr)
3098                 ieee80211_send_4addr_nullfunc(local, sdata);
3099
3100         /*
3101          * Start timer to probe the connection to the AP now.
3102          * Also start the timer that will detect beacon loss.
3103          */
3104         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3105         ieee80211_sta_reset_beacon_monitor(sdata);
3106
3107         ret = true;
3108  out:
3109         kfree(bss_ies);
3110         return ret;
3111 }
3112
3113 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3114                                          struct ieee80211_mgmt *mgmt,
3115                                          size_t len)
3116 {
3117         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3118         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3119         u16 capab_info, status_code, aid;
3120         struct ieee802_11_elems elems;
3121         int ac, uapsd_queues = -1;
3122         u8 *pos;
3123         bool reassoc;
3124         struct cfg80211_bss *bss;
3125         struct ieee80211_event event = {
3126                 .type = MLME_EVENT,
3127                 .u.mlme.data = ASSOC_EVENT,
3128         };
3129
3130         sdata_assert_lock(sdata);
3131
3132         if (!assoc_data)
3133                 return;
3134         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3135                 return;
3136
3137         /*
3138          * AssocResp and ReassocResp have identical structure, so process both
3139          * of them in this function.
3140          */
3141
3142         if (len < 24 + 6)
3143                 return;
3144
3145         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3146         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3147         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3148         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3149
3150         sdata_info(sdata,
3151                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3152                    reassoc ? "Rea" : "A", mgmt->sa,
3153                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3154
3155         pos = mgmt->u.assoc_resp.variable;
3156         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3157
3158         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3159             elems.timeout_int &&
3160             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3161                 u32 tu, ms;
3162                 tu = le32_to_cpu(elems.timeout_int->value);
3163                 ms = tu * 1024 / 1000;
3164                 sdata_info(sdata,
3165                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3166                            mgmt->sa, tu, ms);
3167                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3168                 assoc_data->timeout_started = true;
3169                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3170                         run_again(sdata, assoc_data->timeout);
3171                 return;
3172         }
3173
3174         bss = assoc_data->bss;
3175
3176         if (status_code != WLAN_STATUS_SUCCESS) {
3177                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3178                            mgmt->sa, status_code);
3179                 ieee80211_destroy_assoc_data(sdata, false, false);
3180                 event.u.mlme.status = MLME_DENIED;
3181                 event.u.mlme.reason = status_code;
3182                 drv_event_callback(sdata->local, sdata, &event);
3183         } else {
3184                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3185                         /* oops -- internal error -- send timeout for now */
3186                         ieee80211_destroy_assoc_data(sdata, false, false);
3187                         cfg80211_assoc_timeout(sdata->dev, bss);
3188                         return;
3189                 }
3190                 event.u.mlme.status = MLME_SUCCESS;
3191                 drv_event_callback(sdata->local, sdata, &event);
3192                 sdata_info(sdata, "associated\n");
3193
3194                 /*
3195                  * destroy assoc_data afterwards, as otherwise an idle
3196                  * recalc after assoc_data is NULL but before associated
3197                  * is set can cause the interface to go idle
3198                  */
3199                 ieee80211_destroy_assoc_data(sdata, true, false);
3200
3201                 /* get uapsd queues configuration */
3202                 uapsd_queues = 0;
3203                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3204                         if (sdata->tx_conf[ac].uapsd)
3205                                 uapsd_queues |= BIT(ac);
3206         }
3207
3208         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3209 }
3210
3211 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3212                                   struct ieee80211_mgmt *mgmt, size_t len,
3213                                   struct ieee80211_rx_status *rx_status,
3214                                   struct ieee802_11_elems *elems)
3215 {
3216         struct ieee80211_local *local = sdata->local;
3217         struct ieee80211_bss *bss;
3218         struct ieee80211_channel *channel;
3219
3220         sdata_assert_lock(sdata);
3221
3222         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3223         if (!channel)
3224                 return;
3225
3226         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3227                                         channel);
3228         if (bss) {
3229                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3230                 ieee80211_rx_bss_put(local, bss);
3231         }
3232 }
3233
3234
3235 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3236                                          struct sk_buff *skb)
3237 {
3238         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3239         struct ieee80211_if_managed *ifmgd;
3240         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3241         size_t baselen, len = skb->len;
3242         struct ieee802_11_elems elems;
3243
3244         ifmgd = &sdata->u.mgd;
3245
3246         sdata_assert_lock(sdata);
3247
3248         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3249                 return; /* ignore ProbeResp to foreign address */
3250
3251         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3252         if (baselen > len)
3253                 return;
3254
3255         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3256                                false, &elems);
3257
3258         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3259
3260         if (ifmgd->associated &&
3261             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3262                 ieee80211_reset_ap_probe(sdata);
3263 }
3264
3265 /*
3266  * This is the canonical list of information elements we care about,
3267  * the filter code also gives us all changes to the Microsoft OUI
3268  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3269  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3270  * changes to requested client power.
3271  *
3272  * We implement beacon filtering in software since that means we can
3273  * avoid processing the frame here and in cfg80211, and userspace
3274  * will not be able to tell whether the hardware supports it or not.
3275  *
3276  * XXX: This list needs to be dynamic -- userspace needs to be able to
3277  *      add items it requires. It also needs to be able to tell us to
3278  *      look out for other vendor IEs.
3279  */
3280 static const u64 care_about_ies =
3281         (1ULL << WLAN_EID_COUNTRY) |
3282         (1ULL << WLAN_EID_ERP_INFO) |
3283         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3284         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3285         (1ULL << WLAN_EID_HT_CAPABILITY) |
3286         (1ULL << WLAN_EID_HT_OPERATION) |
3287         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3288
3289 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3290                                      struct ieee80211_mgmt *mgmt, size_t len,
3291                                      struct ieee80211_rx_status *rx_status)
3292 {
3293         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3294         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3295         size_t baselen;
3296         struct ieee802_11_elems elems;
3297         struct ieee80211_local *local = sdata->local;
3298         struct ieee80211_chanctx_conf *chanctx_conf;
3299         struct ieee80211_channel *chan;
3300         struct sta_info *sta;
3301         u32 changed = 0;
3302         bool erp_valid;
3303         u8 erp_value = 0;
3304         u32 ncrc;
3305         u8 *bssid;
3306         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3307
3308         sdata_assert_lock(sdata);
3309
3310         /* Process beacon from the current BSS */
3311         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3312         if (baselen > len)
3313                 return;
3314
3315         rcu_read_lock();
3316         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3317         if (!chanctx_conf) {
3318                 rcu_read_unlock();
3319                 return;
3320         }
3321
3322         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3323                 rcu_read_unlock();
3324                 return;
3325         }
3326         chan = chanctx_conf->def.chan;
3327         rcu_read_unlock();
3328
3329         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3330             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3331                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3332                                        len - baselen, false, &elems);
3333
3334                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3335                 if (elems.tim && !elems.parse_error) {
3336                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3337                         ifmgd->dtim_period = tim_ie->dtim_period;
3338                 }
3339                 ifmgd->have_beacon = true;
3340                 ifmgd->assoc_data->need_beacon = false;
3341                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3342                         sdata->vif.bss_conf.sync_tsf =
3343                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3344                         sdata->vif.bss_conf.sync_device_ts =
3345                                 rx_status->device_timestamp;
3346                         if (elems.tim)
3347                                 sdata->vif.bss_conf.sync_dtim_count =
3348                                         elems.tim->dtim_count;
3349                         else
3350                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3351                 }
3352                 /* continue assoc process */
3353                 ifmgd->assoc_data->timeout = jiffies;
3354                 ifmgd->assoc_data->timeout_started = true;
3355                 run_again(sdata, ifmgd->assoc_data->timeout);
3356                 return;
3357         }
3358
3359         if (!ifmgd->associated ||
3360             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3361                 return;
3362         bssid = ifmgd->associated->bssid;
3363
3364         /* Track average RSSI from the Beacon frames of the current AP */
3365         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3366                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3367                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3368                 ifmgd->last_cqm_event_signal = 0;
3369                 ifmgd->count_beacon_signal = 1;
3370                 ifmgd->last_ave_beacon_signal = 0;
3371         } else {
3372                 ifmgd->count_beacon_signal++;
3373         }
3374
3375         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3376
3377         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3378             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3379                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3380                 int last_sig = ifmgd->last_ave_beacon_signal;
3381                 struct ieee80211_event event = {
3382                         .type = RSSI_EVENT,
3383                 };
3384
3385                 /*
3386                  * if signal crosses either of the boundaries, invoke callback
3387                  * with appropriate parameters
3388                  */
3389                 if (sig > ifmgd->rssi_max_thold &&
3390                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3391                         ifmgd->last_ave_beacon_signal = sig;
3392                         event.u.rssi.data = RSSI_EVENT_HIGH;
3393                         drv_event_callback(local, sdata, &event);
3394                 } else if (sig < ifmgd->rssi_min_thold &&
3395                            (last_sig >= ifmgd->rssi_max_thold ||
3396                            last_sig == 0)) {
3397                         ifmgd->last_ave_beacon_signal = sig;
3398                         event.u.rssi.data = RSSI_EVENT_LOW;
3399                         drv_event_callback(local, sdata, &event);
3400                 }
3401         }
3402
3403         if (bss_conf->cqm_rssi_thold &&
3404             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3405             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3406                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3407                 int last_event = ifmgd->last_cqm_event_signal;
3408                 int thold = bss_conf->cqm_rssi_thold;
3409                 int hyst = bss_conf->cqm_rssi_hyst;
3410
3411                 if (sig < thold &&
3412                     (last_event == 0 || sig < last_event - hyst)) {
3413                         ifmgd->last_cqm_event_signal = sig;
3414                         ieee80211_cqm_rssi_notify(
3415                                 &sdata->vif,
3416                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3417                                 GFP_KERNEL);
3418                 } else if (sig > thold &&
3419                            (last_event == 0 || sig > last_event + hyst)) {
3420                         ifmgd->last_cqm_event_signal = sig;
3421                         ieee80211_cqm_rssi_notify(
3422                                 &sdata->vif,
3423                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3424                                 GFP_KERNEL);
3425                 }
3426         }
3427
3428         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3429                 mlme_dbg_ratelimited(sdata,
3430                                      "cancelling AP probe due to a received beacon\n");
3431                 ieee80211_reset_ap_probe(sdata);
3432         }
3433
3434         /*
3435          * Push the beacon loss detection into the future since
3436          * we are processing a beacon from the AP just now.
3437          */
3438         ieee80211_sta_reset_beacon_monitor(sdata);
3439
3440         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3441         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3442                                           len - baselen, false, &elems,
3443                                           care_about_ies, ncrc);
3444
3445         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3446             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3447                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3448                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3449                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3450                                 ieee80211_hw_config(local,
3451                                                     IEEE80211_CONF_CHANGE_PS);
3452                         }
3453                         ieee80211_send_nullfunc(local, sdata, false);
3454                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3455                         local->pspolling = true;
3456
3457                         /*
3458                          * Here is assumed that the driver will be
3459                          * able to send ps-poll frame and receive a
3460                          * response even though power save mode is
3461                          * enabled, but some drivers might require
3462                          * to disable power save here. This needs
3463                          * to be investigated.
3464                          */
3465                         ieee80211_send_pspoll(local, sdata);
3466                 }
3467         }
3468
3469         if (sdata->vif.p2p) {
3470                 struct ieee80211_p2p_noa_attr noa = {};
3471                 int ret;
3472
3473                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3474                                             len - baselen,
3475                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3476                                             (u8 *) &noa, sizeof(noa));
3477                 if (ret >= 2) {
3478                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3479                                 /* valid noa_attr and index changed */
3480                                 sdata->u.mgd.p2p_noa_index = noa.index;
3481                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3482                                 changed |= BSS_CHANGED_P2P_PS;
3483                                 /*
3484                                  * make sure we update all information, the CRC
3485                                  * mechanism doesn't look at P2P attributes.
3486                                  */
3487                                 ifmgd->beacon_crc_valid = false;
3488                         }
3489                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3490                         /* noa_attr not found and we had valid noa_attr before */
3491                         sdata->u.mgd.p2p_noa_index = -1;
3492                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3493                         changed |= BSS_CHANGED_P2P_PS;
3494                         ifmgd->beacon_crc_valid = false;
3495                 }
3496         }
3497
3498         if (ifmgd->csa_waiting_bcn)
3499                 ieee80211_chswitch_post_beacon(sdata);
3500
3501         /*
3502          * Update beacon timing and dtim count on every beacon appearance. This
3503          * will allow the driver to use the most updated values. Do it before
3504          * comparing this one with last received beacon.
3505          * IMPORTANT: These parameters would possibly be out of sync by the time
3506          * the driver will use them. The synchronized view is currently
3507          * guaranteed only in certain callbacks.
3508          */
3509         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3510                 sdata->vif.bss_conf.sync_tsf =
3511                         le64_to_cpu(mgmt->u.beacon.timestamp);
3512                 sdata->vif.bss_conf.sync_device_ts =
3513                         rx_status->device_timestamp;
3514                 if (elems.tim)
3515                         sdata->vif.bss_conf.sync_dtim_count =
3516                                 elems.tim->dtim_count;
3517                 else
3518                         sdata->vif.bss_conf.sync_dtim_count = 0;
3519         }
3520
3521         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3522                 return;
3523         ifmgd->beacon_crc = ncrc;
3524         ifmgd->beacon_crc_valid = true;
3525
3526         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3527
3528         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3529                                          rx_status->device_timestamp,
3530                                          &elems, true);
3531
3532         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3533             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3534                                      elems.wmm_param_len))
3535                 changed |= BSS_CHANGED_QOS;
3536
3537         /*
3538          * If we haven't had a beacon before, tell the driver about the
3539          * DTIM period (and beacon timing if desired) now.
3540          */
3541         if (!ifmgd->have_beacon) {
3542                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3543                 if (elems.tim)
3544                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3545                 else
3546                         bss_conf->dtim_period = 1;
3547
3548                 changed |= BSS_CHANGED_BEACON_INFO;
3549                 ifmgd->have_beacon = true;
3550
3551                 mutex_lock(&local->iflist_mtx);
3552                 ieee80211_recalc_ps(local);
3553                 mutex_unlock(&local->iflist_mtx);
3554
3555                 ieee80211_recalc_ps_vif(sdata);
3556         }
3557
3558         if (elems.erp_info) {
3559                 erp_valid = true;
3560                 erp_value = elems.erp_info[0];
3561         } else {
3562                 erp_valid = false;
3563         }
3564         changed |= ieee80211_handle_bss_capability(sdata,
3565                         le16_to_cpu(mgmt->u.beacon.capab_info),
3566                         erp_valid, erp_value);
3567
3568         mutex_lock(&local->sta_mtx);
3569         sta = sta_info_get(sdata, bssid);
3570
3571         if (ieee80211_config_bw(sdata, sta,
3572                                 elems.ht_cap_elem, elems.ht_operation,
3573                                 elems.vht_operation, bssid, &changed)) {
3574                 mutex_unlock(&local->sta_mtx);
3575                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3576                                        WLAN_REASON_DEAUTH_LEAVING,
3577                                        true, deauth_buf);
3578                 ieee80211_report_disconnect(sdata, deauth_buf,
3579                                             sizeof(deauth_buf), true,
3580                                             WLAN_REASON_DEAUTH_LEAVING);
3581                 return;
3582         }
3583
3584         if (sta && elems.opmode_notif)
3585                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3586                                             rx_status->band);
3587         mutex_unlock(&local->sta_mtx);
3588
3589         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3590                                                elems.country_elem,
3591                                                elems.country_elem_len,
3592                                                elems.pwr_constr_elem,
3593                                                elems.cisco_dtpc_elem);
3594
3595         ieee80211_bss_info_change_notify(sdata, changed);
3596 }
3597
3598 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3599                                   struct sk_buff *skb)
3600 {
3601         struct ieee80211_rx_status *rx_status;
3602         struct ieee80211_mgmt *mgmt;
3603         u16 fc;
3604         struct ieee802_11_elems elems;
3605         int ies_len;
3606
3607         rx_status = (struct ieee80211_rx_status *) skb->cb;
3608         mgmt = (struct ieee80211_mgmt *) skb->data;
3609         fc = le16_to_cpu(mgmt->frame_control);
3610
3611         sdata_lock(sdata);
3612
3613         switch (fc & IEEE80211_FCTL_STYPE) {
3614         case IEEE80211_STYPE_BEACON:
3615                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3616                 break;
3617         case IEEE80211_STYPE_PROBE_RESP:
3618                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3619                 break;
3620         case IEEE80211_STYPE_AUTH:
3621                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3622                 break;
3623         case IEEE80211_STYPE_DEAUTH:
3624                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3625                 break;
3626         case IEEE80211_STYPE_DISASSOC:
3627                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3628                 break;
3629         case IEEE80211_STYPE_ASSOC_RESP:
3630         case IEEE80211_STYPE_REASSOC_RESP:
3631                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3632                 break;
3633         case IEEE80211_STYPE_ACTION:
3634                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3635                         ies_len = skb->len -
3636                                   offsetof(struct ieee80211_mgmt,
3637                                            u.action.u.chan_switch.variable);
3638
3639                         if (ies_len < 0)
3640                                 break;
3641
3642                         ieee802_11_parse_elems(
3643                                 mgmt->u.action.u.chan_switch.variable,
3644                                 ies_len, true, &elems);
3645
3646                         if (elems.parse_error)
3647                                 break;
3648
3649                         ieee80211_sta_process_chanswitch(sdata,
3650                                                  rx_status->mactime,
3651                                                  rx_status->device_timestamp,
3652                                                  &elems, false);
3653                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3654                         ies_len = skb->len -
3655                                   offsetof(struct ieee80211_mgmt,
3656                                            u.action.u.ext_chan_switch.variable);
3657
3658                         if (ies_len < 0)
3659                                 break;
3660
3661                         ieee802_11_parse_elems(
3662                                 mgmt->u.action.u.ext_chan_switch.variable,
3663                                 ies_len, true, &elems);
3664
3665                         if (elems.parse_error)
3666                                 break;
3667
3668                         /* for the handling code pretend this was also an IE */
3669                         elems.ext_chansw_ie =
3670                                 &mgmt->u.action.u.ext_chan_switch.data;
3671
3672                         ieee80211_sta_process_chanswitch(sdata,
3673                                                  rx_status->mactime,
3674                                                  rx_status->device_timestamp,
3675                                                  &elems, false);
3676                 }
3677                 break;
3678         }
3679         sdata_unlock(sdata);
3680 }
3681
3682 static void ieee80211_sta_timer(unsigned long data)
3683 {
3684         struct ieee80211_sub_if_data *sdata =
3685                 (struct ieee80211_sub_if_data *) data;
3686
3687         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3688 }
3689
3690 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3691                                           u8 *bssid, u8 reason, bool tx)
3692 {
3693         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3694
3695         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3696                                tx, frame_buf);
3697
3698         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3699                                     reason);
3700 }
3701
3702 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3703 {
3704         struct ieee80211_local *local = sdata->local;
3705         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3706         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3707         u32 tx_flags = 0;
3708         u16 trans = 1;
3709         u16 status = 0;
3710
3711         sdata_assert_lock(sdata);
3712
3713         if (WARN_ON_ONCE(!auth_data))
3714                 return -EINVAL;
3715
3716         auth_data->tries++;
3717
3718         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3719                 sdata_info(sdata, "authentication with %pM timed out\n",
3720                            auth_data->bss->bssid);
3721
3722                 /*
3723                  * Most likely AP is not in the range so remove the
3724                  * bss struct for that AP.
3725                  */
3726                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3727
3728                 return -ETIMEDOUT;
3729         }
3730
3731         drv_mgd_prepare_tx(local, sdata);
3732
3733         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3734                    auth_data->bss->bssid, auth_data->tries,
3735                    IEEE80211_AUTH_MAX_TRIES);
3736
3737         auth_data->expected_transaction = 2;
3738
3739         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3740                 trans = auth_data->sae_trans;
3741                 status = auth_data->sae_status;
3742                 auth_data->expected_transaction = trans;
3743         }
3744
3745         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3746                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3747                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3748
3749         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3750                             auth_data->data, auth_data->data_len,
3751                             auth_data->bss->bssid,
3752                             auth_data->bss->bssid, NULL, 0, 0,
3753                             tx_flags);
3754
3755         if (tx_flags == 0) {
3756                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3757                 auth_data->timeout_started = true;
3758                 run_again(sdata, auth_data->timeout);
3759         } else {
3760                 auth_data->timeout =
3761                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3762                 auth_data->timeout_started = true;
3763                 run_again(sdata, auth_data->timeout);
3764         }
3765
3766         return 0;
3767 }
3768
3769 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3770 {
3771         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3772         struct ieee80211_local *local = sdata->local;
3773
3774         sdata_assert_lock(sdata);
3775
3776         assoc_data->tries++;
3777         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3778                 sdata_info(sdata, "association with %pM timed out\n",
3779                            assoc_data->bss->bssid);
3780
3781                 /*
3782                  * Most likely AP is not in the range so remove the
3783                  * bss struct for that AP.
3784                  */
3785                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3786
3787                 return -ETIMEDOUT;
3788         }
3789
3790         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3791                    assoc_data->bss->bssid, assoc_data->tries,
3792                    IEEE80211_ASSOC_MAX_TRIES);
3793         ieee80211_send_assoc(sdata);
3794
3795         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3796                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3797                 assoc_data->timeout_started = true;
3798                 run_again(sdata, assoc_data->timeout);
3799         } else {
3800                 assoc_data->timeout =
3801                         round_jiffies_up(jiffies +
3802                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3803                 assoc_data->timeout_started = true;
3804                 run_again(sdata, assoc_data->timeout);
3805         }
3806
3807         return 0;
3808 }
3809
3810 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3811                                   __le16 fc, bool acked)
3812 {
3813         struct ieee80211_local *local = sdata->local;
3814
3815         sdata->u.mgd.status_fc = fc;
3816         sdata->u.mgd.status_acked = acked;
3817         sdata->u.mgd.status_received = true;
3818
3819         ieee80211_queue_work(&local->hw, &sdata->work);
3820 }
3821
3822 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3823 {
3824         struct ieee80211_local *local = sdata->local;
3825         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3826
3827         sdata_lock(sdata);
3828
3829         if (ifmgd->status_received) {
3830                 __le16 fc = ifmgd->status_fc;
3831                 bool status_acked = ifmgd->status_acked;
3832
3833                 ifmgd->status_received = false;
3834                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3835                         if (status_acked) {
3836                                 ifmgd->auth_data->timeout =
3837                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3838                                 run_again(sdata, ifmgd->auth_data->timeout);
3839                         } else {
3840                                 ifmgd->auth_data->timeout = jiffies - 1;
3841                         }
3842                         ifmgd->auth_data->timeout_started = true;
3843                 } else if (ifmgd->assoc_data &&
3844                            (ieee80211_is_assoc_req(fc) ||
3845                             ieee80211_is_reassoc_req(fc))) {
3846                         if (status_acked) {
3847                                 ifmgd->assoc_data->timeout =
3848                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3849                                 run_again(sdata, ifmgd->assoc_data->timeout);
3850                         } else {
3851                                 ifmgd->assoc_data->timeout = jiffies - 1;
3852                         }
3853                         ifmgd->assoc_data->timeout_started = true;
3854                 }
3855         }
3856
3857         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3858             time_after(jiffies, ifmgd->auth_data->timeout)) {
3859                 if (ifmgd->auth_data->done) {
3860                         /*
3861                          * ok ... we waited for assoc but userspace didn't,
3862                          * so let's just kill the auth data
3863                          */
3864                         ieee80211_destroy_auth_data(sdata, false);
3865                 } else if (ieee80211_auth(sdata)) {
3866                         u8 bssid[ETH_ALEN];
3867                         struct ieee80211_event event = {
3868                                 .type = MLME_EVENT,
3869                                 .u.mlme.data = AUTH_EVENT,
3870                                 .u.mlme.status = MLME_TIMEOUT,
3871                         };
3872
3873                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3874
3875                         ieee80211_destroy_auth_data(sdata, false);
3876
3877                         cfg80211_auth_timeout(sdata->dev, bssid);
3878                         drv_event_callback(sdata->local, sdata, &event);
3879                 }
3880         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3881                 run_again(sdata, ifmgd->auth_data->timeout);
3882
3883         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3884             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3885                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3886                     ieee80211_do_assoc(sdata)) {
3887                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3888                         struct ieee80211_event event = {
3889                                 .type = MLME_EVENT,
3890                                 .u.mlme.data = ASSOC_EVENT,
3891                                 .u.mlme.status = MLME_TIMEOUT,
3892                         };
3893
3894                         ieee80211_destroy_assoc_data(sdata, false, false);
3895                         cfg80211_assoc_timeout(sdata->dev, bss);
3896                         drv_event_callback(sdata->local, sdata, &event);
3897                 }
3898         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3899                 run_again(sdata, ifmgd->assoc_data->timeout);
3900
3901         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3902             ifmgd->associated) {
3903                 u8 bssid[ETH_ALEN];
3904                 int max_tries;
3905
3906                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3907
3908                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3909                         max_tries = max_nullfunc_tries;
3910                 else
3911                         max_tries = max_probe_tries;
3912
3913                 /* ACK received for nullfunc probing frame */
3914                 if (!ifmgd->probe_send_count)
3915                         ieee80211_reset_ap_probe(sdata);
3916                 else if (ifmgd->nullfunc_failed) {
3917                         if (ifmgd->probe_send_count < max_tries) {
3918                                 mlme_dbg(sdata,
3919                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3920                                          bssid, ifmgd->probe_send_count,
3921                                          max_tries);
3922                                 ieee80211_mgd_probe_ap_send(sdata);
3923                         } else {
3924                                 mlme_dbg(sdata,
3925                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3926                                          bssid);
3927                                 ieee80211_sta_connection_lost(sdata, bssid,
3928                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3929                                         false);
3930                         }
3931                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3932                         run_again(sdata, ifmgd->probe_timeout);
3933                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3934                         mlme_dbg(sdata,
3935                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3936                                  bssid, probe_wait_ms);
3937                         ieee80211_sta_connection_lost(sdata, bssid,
3938                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3939                 } else if (ifmgd->probe_send_count < max_tries) {
3940                         mlme_dbg(sdata,
3941                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3942                                  bssid, probe_wait_ms,
3943                                  ifmgd->probe_send_count, max_tries);
3944                         ieee80211_mgd_probe_ap_send(sdata);
3945                 } else {
3946                         /*
3947                          * We actually lost the connection ... or did we?
3948                          * Let's make sure!
3949                          */
3950                         wiphy_debug(local->hw.wiphy,
3951                                     "%s: No probe response from AP %pM"
3952                                     " after %dms, disconnecting.\n",
3953                                     sdata->name,
3954                                     bssid, probe_wait_ms);
3955
3956                         ieee80211_sta_connection_lost(sdata, bssid,
3957                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3958                 }
3959         }
3960
3961         sdata_unlock(sdata);
3962 }
3963
3964 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3965 {
3966         struct ieee80211_sub_if_data *sdata =
3967                 (struct ieee80211_sub_if_data *) data;
3968         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3969
3970         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3971                 return;
3972
3973         sdata->u.mgd.connection_loss = false;
3974         ieee80211_queue_work(&sdata->local->hw,
3975                              &sdata->u.mgd.beacon_connection_loss_work);
3976 }
3977
3978 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3979 {
3980         struct ieee80211_sub_if_data *sdata =
3981                 (struct ieee80211_sub_if_data *) data;
3982         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3983         struct ieee80211_local *local = sdata->local;
3984
3985         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3986                 return;
3987
3988         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3989 }
3990
3991 static void ieee80211_sta_monitor_work(struct work_struct *work)
3992 {
3993         struct ieee80211_sub_if_data *sdata =
3994                 container_of(work, struct ieee80211_sub_if_data,
3995                              u.mgd.monitor_work);
3996
3997         ieee80211_mgd_probe_ap(sdata, false);
3998 }
3999
4000 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4001 {
4002         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4003                 __ieee80211_stop_poll(sdata);
4004
4005                 /* let's probe the connection once */
4006                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4007                         ieee80211_queue_work(&sdata->local->hw,
4008                                              &sdata->u.mgd.monitor_work);
4009         }
4010 }
4011
4012 #ifdef CONFIG_PM
4013 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4014 {
4015         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4016         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4017
4018         sdata_lock(sdata);
4019
4020         if (ifmgd->auth_data || ifmgd->assoc_data) {
4021                 const u8 *bssid = ifmgd->auth_data ?
4022                                 ifmgd->auth_data->bss->bssid :
4023                                 ifmgd->assoc_data->bss->bssid;
4024
4025                 /*
4026                  * If we are trying to authenticate / associate while suspending,
4027                  * cfg80211 won't know and won't actually abort those attempts,
4028                  * thus we need to do that ourselves.
4029                  */
4030                 ieee80211_send_deauth_disassoc(sdata, bssid,
4031                                                IEEE80211_STYPE_DEAUTH,
4032                                                WLAN_REASON_DEAUTH_LEAVING,
4033                                                false, frame_buf);
4034                 if (ifmgd->assoc_data)
4035                         ieee80211_destroy_assoc_data(sdata, false, true);
4036                 if (ifmgd->auth_data)
4037                         ieee80211_destroy_auth_data(sdata, false);
4038                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4039                                       IEEE80211_DEAUTH_FRAME_LEN);
4040         }
4041
4042         /* This is a bit of a hack - we should find a better and more generic
4043          * solution to this. Normally when suspending, cfg80211 will in fact
4044          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4045          * auth (not so important) or assoc (this is the problem) process.
4046          *
4047          * As a consequence, it can happen that we are in the process of both
4048          * associating and suspending, and receive an association response
4049          * after cfg80211 has checked if it needs to disconnect, but before
4050          * we actually set the flag to drop incoming frames. This will then
4051          * cause the workqueue flush to process the association response in
4052          * the suspend, resulting in a successful association just before it
4053          * tries to remove the interface from the driver, which now though
4054          * has a channel context assigned ... this results in issues.
4055          *
4056          * To work around this (for now) simply deauth here again if we're
4057          * now connected.
4058          */
4059         if (ifmgd->associated && !sdata->local->wowlan) {
4060                 u8 bssid[ETH_ALEN];
4061                 struct cfg80211_deauth_request req = {
4062                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4063                         .bssid = bssid,
4064                 };
4065
4066                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4067                 ieee80211_mgd_deauth(sdata, &req);
4068         }
4069
4070         sdata_unlock(sdata);
4071 }
4072
4073 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4074 {
4075         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4076
4077         sdata_lock(sdata);
4078         if (!ifmgd->associated) {
4079                 sdata_unlock(sdata);
4080                 return;
4081         }
4082
4083         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4084                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4085                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4086                 ieee80211_sta_connection_lost(sdata,
4087                                               ifmgd->associated->bssid,
4088                                               WLAN_REASON_UNSPECIFIED,
4089                                               true);
4090                 sdata_unlock(sdata);
4091                 return;
4092         }
4093         sdata_unlock(sdata);
4094 }
4095 #endif
4096
4097 /* interface setup */
4098 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4099 {
4100         struct ieee80211_if_managed *ifmgd;
4101
4102         ifmgd = &sdata->u.mgd;
4103         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4104         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4105         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4106                   ieee80211_beacon_connection_loss_work);
4107         INIT_WORK(&ifmgd->csa_connection_drop_work,
4108                   ieee80211_csa_connection_drop_work);
4109         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4110         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4111                           ieee80211_tdls_peer_del_work);
4112         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4113                     (unsigned long) sdata);
4114         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4115                     (unsigned long) sdata);
4116         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4117                     (unsigned long) sdata);
4118         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4119                     (unsigned long) sdata);
4120         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4121                           ieee80211_sta_handle_tspec_ac_params_wk);
4122
4123         ifmgd->flags = 0;
4124         ifmgd->powersave = sdata->wdev.ps;
4125         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4126         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4127         ifmgd->p2p_noa_index = -1;
4128
4129         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4130                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4131         else
4132                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4133
4134         /* Setup TDLS data */
4135         spin_lock_init(&ifmgd->teardown_lock);
4136         ifmgd->teardown_skb = NULL;
4137         ifmgd->orig_teardown_skb = NULL;
4138 }
4139
4140 /* scan finished notification */
4141 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4142 {
4143         struct ieee80211_sub_if_data *sdata;
4144
4145         /* Restart STA timers */
4146         rcu_read_lock();
4147         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4148                 if (ieee80211_sdata_running(sdata))
4149                         ieee80211_restart_sta_timer(sdata);
4150         }
4151         rcu_read_unlock();
4152 }
4153
4154 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4155                                      struct cfg80211_bss *cbss)
4156 {
4157         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4158         const u8 *ht_cap_ie, *vht_cap_ie;
4159         const struct ieee80211_ht_cap *ht_cap;
4160         const struct ieee80211_vht_cap *vht_cap;
4161         u8 chains = 1;
4162
4163         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4164                 return chains;
4165
4166         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4167         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4168                 ht_cap = (void *)(ht_cap_ie + 2);
4169                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4170                 /*
4171                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4172                  *       "Tx Unequal Modulation Supported" fields.
4173                  */
4174         }
4175
4176         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4177                 return chains;
4178
4179         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4180         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4181                 u8 nss;
4182                 u16 tx_mcs_map;
4183
4184                 vht_cap = (void *)(vht_cap_ie + 2);
4185                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4186                 for (nss = 8; nss > 0; nss--) {
4187                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4188                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4189                                 break;
4190                 }
4191                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4192                 chains = max(chains, nss);
4193         }
4194
4195         return chains;
4196 }
4197
4198 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4199                                   struct cfg80211_bss *cbss)
4200 {
4201         struct ieee80211_local *local = sdata->local;
4202         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4203         const struct ieee80211_ht_cap *ht_cap = NULL;
4204         const struct ieee80211_ht_operation *ht_oper = NULL;
4205         const struct ieee80211_vht_operation *vht_oper = NULL;
4206         struct ieee80211_supported_band *sband;
4207         struct cfg80211_chan_def chandef;
4208         int ret;
4209         u32 i;
4210         bool have_80mhz;
4211
4212         sband = local->hw.wiphy->bands[cbss->channel->band];
4213
4214         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4215                           IEEE80211_STA_DISABLE_80P80MHZ |
4216                           IEEE80211_STA_DISABLE_160MHZ);
4217
4218         rcu_read_lock();
4219
4220         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4221             sband->ht_cap.ht_supported) {
4222                 const u8 *ht_oper_ie, *ht_cap_ie;
4223
4224                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4225                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4226                         ht_oper = (void *)(ht_oper_ie + 2);
4227
4228                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4229                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4230                         ht_cap = (void *)(ht_cap_ie + 2);
4231
4232                 if (!ht_cap) {
4233                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4234                         ht_oper = NULL;
4235                 }
4236         }
4237
4238         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4239             sband->vht_cap.vht_supported) {
4240                 const u8 *vht_oper_ie, *vht_cap;
4241
4242                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4243                                                    WLAN_EID_VHT_OPERATION);
4244                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4245                         vht_oper = (void *)(vht_oper_ie + 2);
4246                 if (vht_oper && !ht_oper) {
4247                         vht_oper = NULL;
4248                         sdata_info(sdata,
4249                                    "AP advertised VHT without HT, disabling both\n");
4250                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4251                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4252                 }
4253
4254                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4255                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4256                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4257                         vht_oper = NULL;
4258                 }
4259         }
4260
4261         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4262         have_80mhz = false;
4263         for (i = 0; i < sband->n_channels; i++) {
4264                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4265                                                 IEEE80211_CHAN_NO_80MHZ))
4266                         continue;
4267
4268                 have_80mhz = true;
4269                 break;
4270         }
4271
4272         if (!have_80mhz)
4273                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4274
4275         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4276                                                      cbss->channel,
4277                                                      ht_cap, ht_oper, vht_oper,
4278                                                      &chandef, false);
4279
4280         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4281                                       local->rx_chains);
4282
4283         rcu_read_unlock();
4284
4285         /* will change later if needed */
4286         sdata->smps_mode = IEEE80211_SMPS_OFF;
4287
4288         mutex_lock(&local->mtx);
4289         /*
4290          * If this fails (possibly due to channel context sharing
4291          * on incompatible channels, e.g. 80+80 and 160 sharing the
4292          * same control channel) try to use a smaller bandwidth.
4293          */
4294         ret = ieee80211_vif_use_channel(sdata, &chandef,
4295                                         IEEE80211_CHANCTX_SHARED);
4296
4297         /* don't downgrade for 5 and 10 MHz channels, though. */
4298         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4299             chandef.width == NL80211_CHAN_WIDTH_10)
4300                 goto out;
4301
4302         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4303                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4304                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4305                                                 IEEE80211_CHANCTX_SHARED);
4306         }
4307  out:
4308         mutex_unlock(&local->mtx);
4309         return ret;
4310 }
4311
4312 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4313                                      struct cfg80211_bss *cbss, bool assoc,
4314                                      bool override)
4315 {
4316         struct ieee80211_local *local = sdata->local;
4317         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4318         struct ieee80211_bss *bss = (void *)cbss->priv;
4319         struct sta_info *new_sta = NULL;
4320         struct ieee80211_supported_band *sband;
4321         bool have_sta = false;
4322         int err;
4323
4324         sband = local->hw.wiphy->bands[cbss->channel->band];
4325
4326         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4327                 return -EINVAL;
4328
4329         if (assoc) {
4330                 rcu_read_lock();
4331                 have_sta = sta_info_get(sdata, cbss->bssid);
4332                 rcu_read_unlock();
4333         }
4334
4335         if (!have_sta) {
4336                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4337                 if (!new_sta)
4338                         return -ENOMEM;
4339         }
4340
4341         if (new_sta || override) {
4342                 err = ieee80211_prep_channel(sdata, cbss);
4343                 if (err) {
4344                         if (new_sta)
4345                                 sta_info_free(local, new_sta);
4346                         return -EINVAL;
4347                 }
4348         }
4349
4350         if (new_sta) {
4351                 u32 rates = 0, basic_rates = 0;
4352                 bool have_higher_than_11mbit;
4353                 int min_rate = INT_MAX, min_rate_index = -1;
4354                 struct ieee80211_chanctx_conf *chanctx_conf;
4355                 const struct cfg80211_bss_ies *ies;
4356                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4357                 u32 rate_flags;
4358
4359                 rcu_read_lock();
4360                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4361                 if (WARN_ON(!chanctx_conf)) {
4362                         rcu_read_unlock();
4363                         sta_info_free(local, new_sta);
4364                         return -EINVAL;
4365                 }
4366                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4367                 rcu_read_unlock();
4368
4369                 ieee80211_get_rates(sband, bss->supp_rates,
4370                                     bss->supp_rates_len,
4371                                     &rates, &basic_rates,
4372                                     &have_higher_than_11mbit,
4373                                     &min_rate, &min_rate_index,
4374                                     shift, rate_flags);
4375
4376                 /*
4377                  * This used to be a workaround for basic rates missing
4378                  * in the association response frame. Now that we no
4379                  * longer use the basic rates from there, it probably
4380                  * doesn't happen any more, but keep the workaround so
4381                  * in case some *other* APs are buggy in different ways
4382                  * we can connect -- with a warning.
4383                  */
4384                 if (!basic_rates && min_rate_index >= 0) {
4385                         sdata_info(sdata,
4386                                    "No basic rates, using min rate instead\n");
4387                         basic_rates = BIT(min_rate_index);
4388                 }
4389
4390                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4391                 sdata->vif.bss_conf.basic_rates = basic_rates;
4392
4393                 /* cf. IEEE 802.11 9.2.12 */
4394                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4395                     have_higher_than_11mbit)
4396                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4397                 else
4398                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4399
4400                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4401
4402                 /* set timing information */
4403                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4404                 rcu_read_lock();
4405                 ies = rcu_dereference(cbss->beacon_ies);
4406                 if (ies) {
4407                         const u8 *tim_ie;
4408
4409                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4410                         sdata->vif.bss_conf.sync_device_ts =
4411                                 bss->device_ts_beacon;
4412                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4413                                                   ies->data, ies->len);
4414                         if (tim_ie && tim_ie[1] >= 2)
4415                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4416                         else
4417                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4418                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4419                                                TIMING_BEACON_ONLY)) {
4420                         ies = rcu_dereference(cbss->proberesp_ies);
4421                         /* must be non-NULL since beacon IEs were NULL */
4422                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4423                         sdata->vif.bss_conf.sync_device_ts =
4424                                 bss->device_ts_presp;
4425                         sdata->vif.bss_conf.sync_dtim_count = 0;
4426                 } else {
4427                         sdata->vif.bss_conf.sync_tsf = 0;
4428                         sdata->vif.bss_conf.sync_device_ts = 0;
4429                         sdata->vif.bss_conf.sync_dtim_count = 0;
4430                 }
4431                 rcu_read_unlock();
4432
4433                 /* tell driver about BSSID, basic rates and timing */
4434                 ieee80211_bss_info_change_notify(sdata,
4435                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4436                         BSS_CHANGED_BEACON_INT);
4437
4438                 if (assoc)
4439                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4440
4441                 err = sta_info_insert(new_sta);
4442                 new_sta = NULL;
4443                 if (err) {
4444                         sdata_info(sdata,
4445                                    "failed to insert STA entry for the AP (error %d)\n",
4446                                    err);
4447                         return err;
4448                 }
4449         } else
4450                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4451
4452         /* Cancel scan to ensure that nothing interferes with connection */
4453         if (local->scanning)
4454                 ieee80211_scan_cancel(local);
4455
4456         return 0;
4457 }
4458
4459 /* config hooks */
4460 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4461                        struct cfg80211_auth_request *req)
4462 {
4463         struct ieee80211_local *local = sdata->local;
4464         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4465         struct ieee80211_mgd_auth_data *auth_data;
4466         u16 auth_alg;
4467         int err;
4468
4469         /* prepare auth data structure */
4470
4471         switch (req->auth_type) {
4472         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4473                 auth_alg = WLAN_AUTH_OPEN;
4474                 break;
4475         case NL80211_AUTHTYPE_SHARED_KEY:
4476                 if (IS_ERR(local->wep_tx_tfm))
4477                         return -EOPNOTSUPP;
4478                 auth_alg = WLAN_AUTH_SHARED_KEY;
4479                 break;
4480         case NL80211_AUTHTYPE_FT:
4481                 auth_alg = WLAN_AUTH_FT;
4482                 break;
4483         case NL80211_AUTHTYPE_NETWORK_EAP:
4484                 auth_alg = WLAN_AUTH_LEAP;
4485                 break;
4486         case NL80211_AUTHTYPE_SAE:
4487                 auth_alg = WLAN_AUTH_SAE;
4488                 break;
4489         default:
4490                 return -EOPNOTSUPP;
4491         }
4492
4493         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4494                             req->ie_len, GFP_KERNEL);
4495         if (!auth_data)
4496                 return -ENOMEM;
4497
4498         auth_data->bss = req->bss;
4499
4500         if (req->sae_data_len >= 4) {
4501                 __le16 *pos = (__le16 *) req->sae_data;
4502                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4503                 auth_data->sae_status = le16_to_cpu(pos[1]);
4504                 memcpy(auth_data->data, req->sae_data + 4,
4505                        req->sae_data_len - 4);
4506                 auth_data->data_len += req->sae_data_len - 4;
4507         }
4508
4509         if (req->ie && req->ie_len) {
4510                 memcpy(&auth_data->data[auth_data->data_len],
4511                        req->ie, req->ie_len);
4512                 auth_data->data_len += req->ie_len;
4513         }
4514
4515         if (req->key && req->key_len) {
4516                 auth_data->key_len = req->key_len;
4517                 auth_data->key_idx = req->key_idx;
4518                 memcpy(auth_data->key, req->key, req->key_len);
4519         }
4520
4521         auth_data->algorithm = auth_alg;
4522
4523         /* try to authenticate/probe */
4524
4525         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4526             ifmgd->assoc_data) {
4527                 err = -EBUSY;
4528                 goto err_free;
4529         }
4530
4531         if (ifmgd->auth_data)
4532                 ieee80211_destroy_auth_data(sdata, false);
4533
4534         /* prep auth_data so we don't go into idle on disassoc */
4535         ifmgd->auth_data = auth_data;
4536
4537         if (ifmgd->associated) {
4538                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4539
4540                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4541                                        WLAN_REASON_UNSPECIFIED,
4542                                        false, frame_buf);
4543
4544                 ieee80211_report_disconnect(sdata, frame_buf,
4545                                             sizeof(frame_buf), true,
4546                                             WLAN_REASON_UNSPECIFIED);
4547         }
4548
4549         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4550
4551         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4552         if (err)
4553                 goto err_clear;
4554
4555         err = ieee80211_auth(sdata);
4556         if (err) {
4557                 sta_info_destroy_addr(sdata, req->bss->bssid);
4558                 goto err_clear;
4559         }
4560
4561         /* hold our own reference */
4562         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4563         return 0;
4564
4565  err_clear:
4566         eth_zero_addr(ifmgd->bssid);
4567         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4568         ifmgd->auth_data = NULL;
4569         mutex_lock(&sdata->local->mtx);
4570         ieee80211_vif_release_channel(sdata);
4571         mutex_unlock(&sdata->local->mtx);
4572  err_free:
4573         kfree(auth_data);
4574         return err;
4575 }
4576
4577 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4578                         struct cfg80211_assoc_request *req)
4579 {
4580         struct ieee80211_local *local = sdata->local;
4581         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4582         struct ieee80211_bss *bss = (void *)req->bss->priv;
4583         struct ieee80211_mgd_assoc_data *assoc_data;
4584         const struct cfg80211_bss_ies *beacon_ies;
4585         struct ieee80211_supported_band *sband;
4586         const u8 *ssidie, *ht_ie, *vht_ie;
4587         int i, err;
4588         bool override = false;
4589
4590         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4591         if (!assoc_data)
4592                 return -ENOMEM;
4593
4594         rcu_read_lock();
4595         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4596         if (!ssidie) {
4597                 rcu_read_unlock();
4598                 kfree(assoc_data);
4599                 return -EINVAL;
4600         }
4601         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4602         assoc_data->ssid_len = ssidie[1];
4603         rcu_read_unlock();
4604
4605         if (ifmgd->associated) {
4606                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4607
4608                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4609                                        WLAN_REASON_UNSPECIFIED,
4610                                        false, frame_buf);
4611
4612                 ieee80211_report_disconnect(sdata, frame_buf,
4613                                             sizeof(frame_buf), true,
4614                                             WLAN_REASON_UNSPECIFIED);
4615         }
4616
4617         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4618                 err = -EBUSY;
4619                 goto err_free;
4620         }
4621
4622         if (ifmgd->assoc_data) {
4623                 err = -EBUSY;
4624                 goto err_free;
4625         }
4626
4627         if (ifmgd->auth_data) {
4628                 bool match;
4629
4630                 /* keep sta info, bssid if matching */
4631                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4632                 ieee80211_destroy_auth_data(sdata, match);
4633         }
4634
4635         /* prepare assoc data */
4636
4637         ifmgd->beacon_crc_valid = false;
4638
4639         assoc_data->wmm = bss->wmm_used &&
4640                           (local->hw.queues >= IEEE80211_NUM_ACS);
4641
4642         /*
4643          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4644          * We still associate in non-HT mode (11a/b/g) if any one of these
4645          * ciphers is configured as pairwise.
4646          * We can set this to true for non-11n hardware, that'll be checked
4647          * separately along with the peer capabilities.
4648          */
4649         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4650                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4651                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4652                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4653                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4654                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4655                         netdev_info(sdata->dev,
4656                                     "disabling HT/VHT due to WEP/TKIP use\n");
4657                 }
4658         }
4659
4660         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4661         sband = local->hw.wiphy->bands[req->bss->channel->band];
4662         if (!sband->ht_cap.ht_supported ||
4663             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4664             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4665                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4666                 if (!bss->wmm_used &&
4667                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4668                         netdev_info(sdata->dev,
4669                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4670         }
4671
4672         /* disable VHT if we don't support it or the AP doesn't use WMM */
4673         if (!sband->vht_cap.vht_supported ||
4674             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4675             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4676                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4677                 if (!bss->wmm_used &&
4678                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4679                         netdev_info(sdata->dev,
4680                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4681         }
4682
4683         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4684         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4685                sizeof(ifmgd->ht_capa_mask));
4686
4687         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4688         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4689                sizeof(ifmgd->vht_capa_mask));
4690
4691         if (req->ie && req->ie_len) {
4692                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4693                 assoc_data->ie_len = req->ie_len;
4694         }
4695
4696         assoc_data->bss = req->bss;
4697
4698         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4699                 if (ifmgd->powersave)
4700                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4701                 else
4702                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4703         } else
4704                 sdata->smps_mode = ifmgd->req_smps;
4705
4706         assoc_data->capability = req->bss->capability;
4707         assoc_data->supp_rates = bss->supp_rates;
4708         assoc_data->supp_rates_len = bss->supp_rates_len;
4709
4710         rcu_read_lock();
4711         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4712         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4713                 assoc_data->ap_ht_param =
4714                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4715         else
4716                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4717         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4718         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4719                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4720                        sizeof(struct ieee80211_vht_cap));
4721         else
4722                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4723         rcu_read_unlock();
4724
4725         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4726                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4727              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4728                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4729
4730         if (bss->wmm_used && bss->uapsd_supported &&
4731             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4732                 assoc_data->uapsd = true;
4733                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4734         } else {
4735                 assoc_data->uapsd = false;
4736                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4737         }
4738
4739         if (req->prev_bssid)
4740                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4741
4742         if (req->use_mfp) {
4743                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4744                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4745         } else {
4746                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4747                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4748         }
4749
4750         if (req->flags & ASSOC_REQ_USE_RRM)
4751                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4752         else
4753                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4754
4755         if (req->crypto.control_port)
4756                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4757         else
4758                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4759
4760         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4761         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4762         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4763                                                         sdata->vif.type);
4764
4765         /* kick off associate process */
4766
4767         ifmgd->assoc_data = assoc_data;
4768         ifmgd->dtim_period = 0;
4769         ifmgd->have_beacon = false;
4770
4771         /* override HT/VHT configuration only if the AP and we support it */
4772         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4773                 struct ieee80211_sta_ht_cap sta_ht_cap;
4774
4775                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4776                         override = true;
4777
4778                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4779                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4780
4781                 /* check for 40 MHz disable override */
4782                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4783                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4784                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4785                         override = true;
4786
4787                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4788                     req->flags & ASSOC_REQ_DISABLE_VHT)
4789                         override = true;
4790         }
4791
4792         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4793                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4794                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4795         }
4796
4797         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4798                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4799
4800         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4801         if (err)
4802                 goto err_clear;
4803
4804         rcu_read_lock();
4805         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4806
4807         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4808             !beacon_ies) {
4809                 /*
4810                  * Wait up to one beacon interval ...
4811                  * should this be more if we miss one?
4812                  */
4813                 sdata_info(sdata, "waiting for beacon from %pM\n",
4814                            ifmgd->bssid);
4815                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4816                 assoc_data->timeout_started = true;
4817                 assoc_data->need_beacon = true;
4818         } else if (beacon_ies) {
4819                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4820                                                     beacon_ies->data,
4821                                                     beacon_ies->len);
4822                 u8 dtim_count = 0;
4823
4824                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4825                         const struct ieee80211_tim_ie *tim;
4826                         tim = (void *)(tim_ie + 2);
4827                         ifmgd->dtim_period = tim->dtim_period;
4828                         dtim_count = tim->dtim_count;
4829                 }
4830                 ifmgd->have_beacon = true;
4831                 assoc_data->timeout = jiffies;
4832                 assoc_data->timeout_started = true;
4833
4834                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4835                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4836                         sdata->vif.bss_conf.sync_device_ts =
4837                                 bss->device_ts_beacon;
4838                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4839                 }
4840         } else {
4841                 assoc_data->timeout = jiffies;
4842                 assoc_data->timeout_started = true;
4843         }
4844         rcu_read_unlock();
4845
4846         run_again(sdata, assoc_data->timeout);
4847
4848         if (bss->corrupt_data) {
4849                 char *corrupt_type = "data";
4850                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4851                         if (bss->corrupt_data &
4852                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4853                                 corrupt_type = "beacon and probe response";
4854                         else
4855                                 corrupt_type = "beacon";
4856                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4857                         corrupt_type = "probe response";
4858                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4859                            corrupt_type);
4860         }
4861
4862         return 0;
4863  err_clear:
4864         eth_zero_addr(ifmgd->bssid);
4865         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4866         ifmgd->assoc_data = NULL;
4867  err_free:
4868         kfree(assoc_data);
4869         return err;
4870 }
4871
4872 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4873                          struct cfg80211_deauth_request *req)
4874 {
4875         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4876         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4877         bool tx = !req->local_state_change;
4878
4879         if (ifmgd->auth_data &&
4880             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4881                 sdata_info(sdata,
4882                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4883                            req->bssid, req->reason_code,
4884                            ieee80211_get_reason_code_string(req->reason_code));
4885
4886                 drv_mgd_prepare_tx(sdata->local, sdata);
4887                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4888                                                IEEE80211_STYPE_DEAUTH,
4889                                                req->reason_code, tx,
4890                                                frame_buf);
4891                 ieee80211_destroy_auth_data(sdata, false);
4892                 ieee80211_report_disconnect(sdata, frame_buf,
4893                                             sizeof(frame_buf), true,
4894                                             req->reason_code);
4895
4896                 return 0;
4897         }
4898
4899         if (ifmgd->assoc_data &&
4900             ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4901                 sdata_info(sdata,
4902                            "aborting association with %pM by local choice (Reason: %u=%s)\n",
4903                            req->bssid, req->reason_code,
4904                            ieee80211_get_reason_code_string(req->reason_code));
4905
4906                 drv_mgd_prepare_tx(sdata->local, sdata);
4907                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4908                                                IEEE80211_STYPE_DEAUTH,
4909                                                req->reason_code, tx,
4910                                                frame_buf);
4911                 ieee80211_destroy_assoc_data(sdata, false, true);
4912                 ieee80211_report_disconnect(sdata, frame_buf,
4913                                             sizeof(frame_buf), true,
4914                                             req->reason_code);
4915                 return 0;
4916         }
4917
4918         if (ifmgd->associated &&
4919             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4920                 sdata_info(sdata,
4921                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4922                            req->bssid, req->reason_code,
4923                            ieee80211_get_reason_code_string(req->reason_code));
4924
4925                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4926                                        req->reason_code, tx, frame_buf);
4927                 ieee80211_report_disconnect(sdata, frame_buf,
4928                                             sizeof(frame_buf), true,
4929                                             req->reason_code);
4930                 return 0;
4931         }
4932
4933         return -ENOTCONN;
4934 }
4935
4936 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4937                            struct cfg80211_disassoc_request *req)
4938 {
4939         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4940         u8 bssid[ETH_ALEN];
4941         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4942
4943         /*
4944          * cfg80211 should catch this ... but it's racy since
4945          * we can receive a disassoc frame, process it, hand it
4946          * to cfg80211 while that's in a locked section already
4947          * trying to tell us that the user wants to disconnect.
4948          */
4949         if (ifmgd->associated != req->bss)
4950                 return -ENOLINK;
4951
4952         sdata_info(sdata,
4953                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4954                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4955
4956         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4957         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4958                                req->reason_code, !req->local_state_change,
4959                                frame_buf);
4960
4961         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
4962                                     req->reason_code);
4963
4964         return 0;
4965 }
4966
4967 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4968 {
4969         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4970
4971         /*
4972          * Make sure some work items will not run after this,
4973          * they will not do anything but might not have been
4974          * cancelled when disconnecting.
4975          */
4976         cancel_work_sync(&ifmgd->monitor_work);
4977         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4978         cancel_work_sync(&ifmgd->request_smps_work);
4979         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4980         cancel_work_sync(&ifmgd->chswitch_work);
4981         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4982
4983         sdata_lock(sdata);
4984         if (ifmgd->assoc_data) {
4985                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4986                 ieee80211_destroy_assoc_data(sdata, false, false);
4987                 cfg80211_assoc_timeout(sdata->dev, bss);
4988         }
4989         if (ifmgd->auth_data)
4990                 ieee80211_destroy_auth_data(sdata, false);
4991         spin_lock_bh(&ifmgd->teardown_lock);
4992         if (ifmgd->teardown_skb) {
4993                 kfree_skb(ifmgd->teardown_skb);
4994                 ifmgd->teardown_skb = NULL;
4995                 ifmgd->orig_teardown_skb = NULL;
4996         }
4997         spin_unlock_bh(&ifmgd->teardown_lock);
4998         del_timer_sync(&ifmgd->timer);
4999         sdata_unlock(sdata);
5000 }
5001
5002 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5003                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5004                                gfp_t gfp)
5005 {
5006         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5007
5008         trace_api_cqm_rssi_notify(sdata, rssi_event);
5009
5010         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5011 }
5012 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5013
5014 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5015 {
5016         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5017
5018         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5019
5020         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5021 }
5022 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);