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  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/pm_qos.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  * Weight given to the latest Beacon frame when calculating average signal
  85  * strength for Beacon frames received in the current BSS. This must be
  86  * between 1 and 15.
  87  */
  88 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  89
  90 /*
  91  * How many Beacon frames need to have been used in average signal strength
  92  * before starting to indicate signal change events.
  93  */
  94 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  95
  96 /*
  97  * We can have multiple work items (and connection probing)
  98  * scheduling this timer, but we need to take care to only
  99  * reschedule it when it should fire _earlier_ than it was
 100  * asked for before, or if it's not pending right now. This
 101  * function ensures that. Note that it then is required to
 102  * run this function for all timeouts after the first one
 103  * has happened -- the work that runs from this timer will
 104  * do that.
 105  */
 106 static void run_again(struct ieee80211_sub_if_data *sdata,
 107                       unsigned long timeout)
 108 {
 109         sdata_assert_lock(sdata);
 110
 111         if (!timer_pending(&sdata->u.mgd.timer) ||
 112             time_before(timeout, sdata->u.mgd.timer.expires))
 113                 mod_timer(&sdata->u.mgd.timer, timeout);
 114 }
 115
 116 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 117 {
 118         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 119                 return;
 120
 121         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 122                 return;
 123
 124         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 125                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 126 }
 127
 128 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 129 {
 130         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 131
 132         if (unlikely(!sdata->u.mgd.associated))
 133                 return;
 134
 135         ifmgd->probe_send_count = 0;
 136
 137         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 138                 return;
 139
 140         mod_timer(&sdata->u.mgd.conn_mon_timer,
 141                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 142 }
 143
 144 static int ecw2cw(int ecw)
 145 {
 146         return (1 << ecw) - 1;
 147 }
 148
 149 static u32
 150 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 151                              struct ieee80211_supported_band *sband,
 152                              struct ieee80211_channel *channel,
 153                              const struct ieee80211_ht_cap *ht_cap,
 154                              const struct ieee80211_ht_operation *ht_oper,
 155                              const struct ieee80211_vht_operation *vht_oper,
 156                              struct cfg80211_chan_def *chandef, bool tracking)
 157 {
 158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 159         struct cfg80211_chan_def vht_chandef;
 160         struct ieee80211_sta_ht_cap sta_ht_cap;
 161         u32 ht_cfreq, ret;
 162
 163         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 164         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 165
 166         chandef->chan = channel;
 167         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 168         chandef->center_freq1 = channel->center_freq;
 169         chandef->center_freq2 = 0;
 170
 171         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 172                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 173                 goto out;
 174         }
 175
 176         chandef->width = NL80211_CHAN_WIDTH_20;
 177
 178         if (!(ht_cap->cap_info &
 179               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 180                 ret = IEEE80211_STA_DISABLE_40MHZ;
 181                 vht_chandef = *chandef;
 182                 goto out;
 183         }
 184
 185         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 186                                                   channel->band);
 187         /* check that channel matches the right operating channel */
 188         if (!tracking && channel->center_freq != ht_cfreq) {
 189                 /*
 190                  * It's possible that some APs are confused here;
 191                  * Netgear WNDR3700 sometimes reports 4 higher than
 192                  * the actual channel in association responses, but
 193                  * since we look at probe response/beacon data here
 194                  * it should be OK.
 195                  */
 196                 sdata_info(sdata,
 197                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 198                            channel->center_freq, ht_cfreq,
 199                            ht_oper->primary_chan, channel->band);
 200                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 201                 goto out;
 202         }
 203
 204         /* check 40 MHz support, if we have it */
 205         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 206                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 207                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 208                         chandef->width = NL80211_CHAN_WIDTH_40;
 209                         chandef->center_freq1 += 10;
 210                         break;
 211                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 212                         chandef->width = NL80211_CHAN_WIDTH_40;
 213                         chandef->center_freq1 -= 10;
 214                         break;
 215                 }
 216         } else {
 217                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 218                 ret = IEEE80211_STA_DISABLE_VHT;
 219                 /* also mark 40 MHz disabled */
 220                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 221                 goto out;
 222         }
 223
 224         if (!vht_oper || !sband->vht_cap.vht_supported) {
 225                 ret = IEEE80211_STA_DISABLE_VHT;
 226                 goto out;
 227         }
 228
 229         vht_chandef.chan = channel;
 230         vht_chandef.center_freq1 =
 231                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 232                                                channel->band);
 233         vht_chandef.center_freq2 = 0;
 234
 235         switch (vht_oper->chan_width) {
 236         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 237                 vht_chandef.width = chandef->width;
 238                 vht_chandef.center_freq1 = chandef->center_freq1;
 239                 break;
 240         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 241                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 242                 break;
 243         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 244                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 245                 break;
 246         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 247                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 248                 vht_chandef.center_freq2 =
 249                         ieee80211_channel_to_frequency(
 250                                 vht_oper->center_freq_seg2_idx,
 251                                 channel->band);
 252                 break;
 253         default:
 254                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 255                         sdata_info(sdata,
 256                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 257                                    vht_oper->chan_width);
 258                 ret = IEEE80211_STA_DISABLE_VHT;
 259                 goto out;
 260         }
 261
 262         if (!cfg80211_chandef_valid(&vht_chandef)) {
 263                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 264                         sdata_info(sdata,
 265                                    "AP VHT information is invalid, disable VHT\n");
 266                 ret = IEEE80211_STA_DISABLE_VHT;
 267                 goto out;
 268         }
 269
 270         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 271                 ret = 0;
 272                 goto out;
 273         }
 274
 275         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 276                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 277                         sdata_info(sdata,
 278                                    "AP VHT information doesn't match HT, disable VHT\n");
 279                 ret = IEEE80211_STA_DISABLE_VHT;
 280                 goto out;
 281         }
 282
 283         *chandef = vht_chandef;
 284
 285         ret = 0;
 286
 287 out:
 288         /*
 289          * When tracking the current AP, don't do any further checks if the
 290          * new chandef is identical to the one we're currently using for the
 291          * connection. This keeps us from playing ping-pong with regulatory,
 292          * without it the following can happen (for example):
 293          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 294          *  - AP advertises regdom US
 295          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 296          *  - the code below detects an unsupported channel, downgrades, and
 297          *    we disconnect from the AP in the caller
 298          *  - disconnect causes CRDA to reload world regdomain and the game
 299          *    starts anew.
 300          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 301          *
 302          * It seems possible that there are still scenarios with CSA or real
 303          * bandwidth changes where a this could happen, but those cases are
 304          * less common and wouldn't completely prevent using the AP.
 305          */
 306         if (tracking &&
 307             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 308                 return ret;
 309
 310         /* don't print the message below for VHT mismatch if VHT is disabled */
 311         if (ret & IEEE80211_STA_DISABLE_VHT)
 312                 vht_chandef = *chandef;
 313
 314         /*
 315          * Ignore the DISABLED flag when we're already connected and only
 316          * tracking the APs beacon for bandwidth changes - otherwise we
 317          * might get disconnected here if we connect to an AP, update our
 318          * regulatory information based on the AP's country IE and the
 319          * information we have is wrong/outdated and disables the channel
 320          * that we're actually using for the connection to the AP.
 321          */
 322         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 323                                         tracking ? 0 :
 324                                                    IEEE80211_CHAN_DISABLED)) {
 325                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 326                         ret = IEEE80211_STA_DISABLE_HT |
 327                               IEEE80211_STA_DISABLE_VHT;
 328                         break;
 329                 }
 330
 331                 ret |= ieee80211_chandef_downgrade(chandef);
 332         }
 333
 334         if (chandef->width != vht_chandef.width && !tracking)
 335                 sdata_info(sdata,
 336                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 337
 338         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 339         return ret;
 340 }
 341
 342 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 343                                struct sta_info *sta,
 344                                const struct ieee80211_ht_cap *ht_cap,
 345                                const struct ieee80211_ht_operation *ht_oper,
 346                                const struct ieee80211_vht_operation *vht_oper,
 347                                const u8 *bssid, u32 *changed)
 348 {
 349         struct ieee80211_local *local = sdata->local;
 350         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 351         struct ieee80211_supported_band *sband;
 352         struct ieee80211_channel *chan;
 353         struct cfg80211_chan_def chandef;
 354         u16 ht_opmode;
 355         u32 flags;
 356         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 357         int ret;
 358
 359         /* if HT was/is disabled, don't track any bandwidth changes */
 360         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 361                 return 0;
 362
 363         /* don't check VHT if we associated as non-VHT station */
 364         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 365                 vht_oper = NULL;
 366
 367         if (WARN_ON_ONCE(!sta))
 368                 return -EINVAL;
 369
 370         /*
 371          * if bss configuration changed store the new one -
 372          * this may be applicable even if channel is identical
 373          */
 374         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 375         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 376                 *changed |= BSS_CHANGED_HT;
 377                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 378         }
 379
 380         chan = sdata->vif.bss_conf.chandef.chan;
 381         sband = local->hw.wiphy->bands[chan->band];
 382
 383         /* calculate new channel (type) based on HT/VHT operation IEs */
 384         flags = ieee80211_determine_chantype(sdata, sband, chan,
 385                                              ht_cap, ht_oper, vht_oper,
 386                                              &chandef, true);
 387
 388         /*
 389          * Downgrade the new channel if we associated with restricted
 390          * capabilities. For example, if we associated as a 20 MHz STA
 391          * to a 40 MHz AP (due to regulatory, capabilities or config
 392          * reasons) then switching to a 40 MHz channel now won't do us
 393          * any good -- we couldn't use it with the AP.
 394          */
 395         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 396             chandef.width == NL80211_CHAN_WIDTH_80P80)
 397                 flags |= ieee80211_chandef_downgrade(&chandef);
 398         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 399             chandef.width == NL80211_CHAN_WIDTH_160)
 400                 flags |= ieee80211_chandef_downgrade(&chandef);
 401         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 402             chandef.width > NL80211_CHAN_WIDTH_20)
 403                 flags |= ieee80211_chandef_downgrade(&chandef);
 404
 405         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 406                 return 0;
 407
 408         sdata_info(sdata,
 409                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 410                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 411                    chandef.center_freq1, chandef.center_freq2);
 412
 413         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 414                                       IEEE80211_STA_DISABLE_VHT |
 415                                       IEEE80211_STA_DISABLE_40MHZ |
 416                                       IEEE80211_STA_DISABLE_80P80MHZ |
 417                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 418             !cfg80211_chandef_valid(&chandef)) {
 419                 sdata_info(sdata,
 420                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 421                            ifmgd->bssid);
 422                 return -EINVAL;
 423         }
 424
 425         switch (chandef.width) {
 426         case NL80211_CHAN_WIDTH_20_NOHT:
 427         case NL80211_CHAN_WIDTH_20:
 428                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 429                 break;
 430         case NL80211_CHAN_WIDTH_40:
 431                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 432                 break;
 433         case NL80211_CHAN_WIDTH_80:
 434                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 435                 break;
 436         case NL80211_CHAN_WIDTH_80P80:
 437         case NL80211_CHAN_WIDTH_160:
 438                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 439                 break;
 440         default:
 441                 return -EINVAL;
 442         }
 443
 444         if (new_sta_bw > sta->cur_max_bandwidth)
 445                 new_sta_bw = sta->cur_max_bandwidth;
 446
 447         if (new_sta_bw < sta->sta.bandwidth) {
 448                 sta->sta.bandwidth = new_sta_bw;
 449                 rate_control_rate_update(local, sband, sta,
 450                                          IEEE80211_RC_BW_CHANGED);
 451         }
 452
 453         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 454         if (ret) {
 455                 sdata_info(sdata,
 456                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 457                            ifmgd->bssid);
 458                 return ret;
 459         }
 460
 461         if (new_sta_bw > sta->sta.bandwidth) {
 462                 sta->sta.bandwidth = new_sta_bw;
 463                 rate_control_rate_update(local, sband, sta,
 464                                          IEEE80211_RC_BW_CHANGED);
 465         }
 466
 467         return 0;
 468 }
 469
 470 /* frame sending functions */
 471
 472 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 473                                 struct sk_buff *skb, u8 ap_ht_param,
 474                                 struct ieee80211_supported_band *sband,
 475                                 struct ieee80211_channel *channel,
 476                                 enum ieee80211_smps_mode smps)
 477 {
 478         u8 *pos;
 479         u32 flags = channel->flags;
 480         u16 cap;
 481         struct ieee80211_sta_ht_cap ht_cap;
 482
 483         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 484
 485         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 486         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 487
 488         /* determine capability flags */
 489         cap = ht_cap.cap;
 490
 491         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 492         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 493                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 494                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 495                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 496                 }
 497                 break;
 498         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 499                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 500                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 501                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 502                 }
 503                 break;
 504         }
 505
 506         /*
 507          * If 40 MHz was disabled associate as though we weren't
 508          * capable of 40 MHz -- some broken APs will never fall
 509          * back to trying to transmit in 20 MHz.
 510          */
 511         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 512                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 513                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 514         }
 515
 516         /* set SM PS mode properly */
 517         cap &= ~IEEE80211_HT_CAP_SM_PS;
 518         switch (smps) {
 519         case IEEE80211_SMPS_AUTOMATIC:
 520         case IEEE80211_SMPS_NUM_MODES:
 521                 WARN_ON(1);
 522         case IEEE80211_SMPS_OFF:
 523                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 524                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 525                 break;
 526         case IEEE80211_SMPS_STATIC:
 527                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 528                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 529                 break;
 530         case IEEE80211_SMPS_DYNAMIC:
 531                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 532                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 533                 break;
 534         }
 535
 536         /* reserve and fill IE */
 537         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 538         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 539 }
 540
 541 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 542                                  struct sk_buff *skb,
 543                                  struct ieee80211_supported_band *sband,
 544                                  struct ieee80211_vht_cap *ap_vht_cap)
 545 {
 546         u8 *pos;
 547         u32 cap;
 548         struct ieee80211_sta_vht_cap vht_cap;
 549         u32 mask, ap_bf_sts, our_bf_sts;
 550
 551         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 552
 553         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 554         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 555
 556         /* determine capability flags */
 557         cap = vht_cap.cap;
 558
 559         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 560                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 561
 562                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 563                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 564                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 565                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 566         }
 567
 568         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 569                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 570                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 571         }
 572
 573         /*
 574          * Some APs apparently get confused if our capabilities are better
 575          * than theirs, so restrict what we advertise in the assoc request.
 576          */
 577         if (!(ap_vht_cap->vht_cap_info &
 578                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 579                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 580
 581         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 582
 583         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 584         our_bf_sts = cap & mask;
 585
 586         if (ap_bf_sts < our_bf_sts) {
 587                 cap &= ~mask;
 588                 cap |= ap_bf_sts;
 589         }
 590
 591         /* reserve and fill IE */
 592         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 593         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 594 }
 595
 596 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 597 {
 598         struct ieee80211_local *local = sdata->local;
 599         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 600         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 601         struct sk_buff *skb;
 602         struct ieee80211_mgmt *mgmt;
 603         u8 *pos, qos_info;
 604         size_t offset = 0, noffset;
 605         int i, count, rates_len, supp_rates_len, shift;
 606         u16 capab;
 607         struct ieee80211_supported_band *sband;
 608         struct ieee80211_chanctx_conf *chanctx_conf;
 609         struct ieee80211_channel *chan;
 610         u32 rate_flags, rates = 0;
 611
 612         sdata_assert_lock(sdata);
 613
 614         rcu_read_lock();
 615         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 616         if (WARN_ON(!chanctx_conf)) {
 617                 rcu_read_unlock();
 618                 return;
 619         }
 620         chan = chanctx_conf->def.chan;
 621         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 622         rcu_read_unlock();
 623         sband = local->hw.wiphy->bands[chan->band];
 624         shift = ieee80211_vif_get_shift(&sdata->vif);
 625
 626         if (assoc_data->supp_rates_len) {
 627                 /*
 628                  * Get all rates supported by the device and the AP as
 629                  * some APs don't like getting a superset of their rates
 630                  * in the association request (e.g. D-Link DAP 1353 in
 631                  * b-only mode)...
 632                  */
 633                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 634                                                      assoc_data->supp_rates,
 635                                                      assoc_data->supp_rates_len,
 636                                                      &rates);
 637         } else {
 638                 /*
 639                  * In case AP not provide any supported rates information
 640                  * before association, we send information element(s) with
 641                  * all rates that we support.
 642                  */
 643                 rates_len = 0;
 644                 for (i = 0; i < sband->n_bitrates; i++) {
 645                         if ((rate_flags & sband->bitrates[i].flags)
 646                             != rate_flags)
 647                                 continue;
 648                         rates |= BIT(i);
 649                         rates_len++;
 650                 }
 651         }
 652
 653         skb = alloc_skb(local->hw.extra_tx_headroom +
 654                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 655                         2 + assoc_data->ssid_len + /* SSID */
 656                         4 + rates_len + /* (extended) rates */
 657                         4 + /* power capability */
 658                         2 + 2 * sband->n_channels + /* supported channels */
 659                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 660                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 661                         assoc_data->ie_len + /* extra IEs */
 662                         9, /* WMM */
 663                         GFP_KERNEL);
 664         if (!skb)
 665                 return;
 666
 667         skb_reserve(skb, local->hw.extra_tx_headroom);
 668
 669         capab = WLAN_CAPABILITY_ESS;
 670
 671         if (sband->band == IEEE80211_BAND_2GHZ) {
 672                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 673                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 674                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 675                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 676         }
 677
 678         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 679                 capab |= WLAN_CAPABILITY_PRIVACY;
 680
 681         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 682             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 683                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 684
 685         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 686                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 687
 688         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 689         memset(mgmt, 0, 24);
 690         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 691         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 692         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 693
 694         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 695                 skb_put(skb, 10);
 696                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 697                                                   IEEE80211_STYPE_REASSOC_REQ);
 698                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 699                 mgmt->u.reassoc_req.listen_interval =
 700                                 cpu_to_le16(local->hw.conf.listen_interval);
 701                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 702                        ETH_ALEN);
 703         } else {
 704                 skb_put(skb, 4);
 705                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 706                                                   IEEE80211_STYPE_ASSOC_REQ);
 707                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 708                 mgmt->u.assoc_req.listen_interval =
 709                                 cpu_to_le16(local->hw.conf.listen_interval);
 710         }
 711
 712         /* SSID */
 713         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 714         *pos++ = WLAN_EID_SSID;
 715         *pos++ = assoc_data->ssid_len;
 716         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 717
 718         /* add all rates which were marked to be used above */
 719         supp_rates_len = rates_len;
 720         if (supp_rates_len > 8)
 721                 supp_rates_len = 8;
 722
 723         pos = skb_put(skb, supp_rates_len + 2);
 724         *pos++ = WLAN_EID_SUPP_RATES;
 725         *pos++ = supp_rates_len;
 726
 727         count = 0;
 728         for (i = 0; i < sband->n_bitrates; i++) {
 729                 if (BIT(i) & rates) {
 730                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 731                                                 5 * (1 << shift));
 732                         *pos++ = (u8) rate;
 733                         if (++count == 8)
 734                                 break;
 735                 }
 736         }
 737
 738         if (rates_len > count) {
 739                 pos = skb_put(skb, rates_len - count + 2);
 740                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 741                 *pos++ = rates_len - count;
 742
 743                 for (i++; i < sband->n_bitrates; i++) {
 744                         if (BIT(i) & rates) {
 745                                 int rate;
 746                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 747                                                     5 * (1 << shift));
 748                                 *pos++ = (u8) rate;
 749                         }
 750                 }
 751         }
 752
 753         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 754             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 755                 pos = skb_put(skb, 4);
 756                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 757                 *pos++ = 2;
 758                 *pos++ = 0; /* min tx power */
 759                  /* max tx power */
 760                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 761         }
 762
 763         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 764                 /* TODO: get this in reg domain format */
 765                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 766                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 767                 *pos++ = 2 * sband->n_channels;
 768                 for (i = 0; i < sband->n_channels; i++) {
 769                         *pos++ = ieee80211_frequency_to_channel(
 770                                         sband->channels[i].center_freq);
 771                         *pos++ = 1; /* one channel in the subband*/
 772                 }
 773         }
 774
 775         /* if present, add any custom IEs that go before HT */
 776         if (assoc_data->ie_len) {
 777                 static const u8 before_ht[] = {
 778                         WLAN_EID_SSID,
 779                         WLAN_EID_SUPP_RATES,
 780                         WLAN_EID_EXT_SUPP_RATES,
 781                         WLAN_EID_PWR_CAPABILITY,
 782                         WLAN_EID_SUPPORTED_CHANNELS,
 783                         WLAN_EID_RSN,
 784                         WLAN_EID_QOS_CAPA,
 785                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 786                         WLAN_EID_MOBILITY_DOMAIN,
 787                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 788                         WLAN_EID_RIC_DATA,              /* reassoc only */
 789                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 790                 };
 791                 static const u8 after_ric[] = {
 792                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 793                         WLAN_EID_HT_CAPABILITY,
 794                         WLAN_EID_BSS_COEX_2040,
 795                         WLAN_EID_EXT_CAPABILITY,
 796                         WLAN_EID_QOS_TRAFFIC_CAPA,
 797                         WLAN_EID_TIM_BCAST_REQ,
 798                         WLAN_EID_INTERWORKING,
 799                         /* 60GHz doesn't happen right now */
 800                         WLAN_EID_VHT_CAPABILITY,
 801                         WLAN_EID_OPMODE_NOTIF,
 802                 };
 803
 804                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 805                                                  assoc_data->ie_len,
 806                                                  before_ht,
 807                                                  ARRAY_SIZE(before_ht),
 808                                                  after_ric,
 809                                                  ARRAY_SIZE(after_ric),
 810                                                  offset);
 811                 pos = skb_put(skb, noffset - offset);
 812                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 813                 offset = noffset;
 814         }
 815
 816         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 817                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 818                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 819
 820         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 821                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 822                                     sband, chan, sdata->smps_mode);
 823
 824         /* if present, add any custom IEs that go before VHT */
 825         if (assoc_data->ie_len) {
 826                 static const u8 before_vht[] = {
 827                         WLAN_EID_SSID,
 828                         WLAN_EID_SUPP_RATES,
 829                         WLAN_EID_EXT_SUPP_RATES,
 830                         WLAN_EID_PWR_CAPABILITY,
 831                         WLAN_EID_SUPPORTED_CHANNELS,
 832                         WLAN_EID_RSN,
 833                         WLAN_EID_QOS_CAPA,
 834                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 835                         WLAN_EID_MOBILITY_DOMAIN,
 836                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 837                         WLAN_EID_HT_CAPABILITY,
 838                         WLAN_EID_BSS_COEX_2040,
 839                         WLAN_EID_EXT_CAPABILITY,
 840                         WLAN_EID_QOS_TRAFFIC_CAPA,
 841                         WLAN_EID_TIM_BCAST_REQ,
 842                         WLAN_EID_INTERWORKING,
 843                 };
 844
 845                 /* RIC already taken above, so no need to handle here anymore */
 846                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 847                                              before_vht, ARRAY_SIZE(before_vht),
 848                                              offset);
 849                 pos = skb_put(skb, noffset - offset);
 850                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 851                 offset = noffset;
 852         }
 853
 854         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 855                 ieee80211_add_vht_ie(sdata, skb, sband,
 856                                      &assoc_data->ap_vht_cap);
 857
 858         /* if present, add any custom non-vendor IEs that go after HT */
 859         if (assoc_data->ie_len) {
 860                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 861                                                     assoc_data->ie_len,
 862                                                     offset);
 863                 pos = skb_put(skb, noffset - offset);
 864                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 865                 offset = noffset;
 866         }
 867
 868         if (assoc_data->wmm) {
 869                 if (assoc_data->uapsd) {
 870                         qos_info = ifmgd->uapsd_queues;
 871                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 872                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 873                 } else {
 874                         qos_info = 0;
 875                 }
 876
 877                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 878         }
 879
 880         /* add any remaining custom (i.e. vendor specific here) IEs */
 881         if (assoc_data->ie_len) {
 882                 noffset = assoc_data->ie_len;
 883                 pos = skb_put(skb, noffset - offset);
 884                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 885         }
 886
 887         drv_mgd_prepare_tx(local, sdata);
 888
 889         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 890         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 891                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 892                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 893         ieee80211_tx_skb(sdata, skb);
 894 }
 895
 896 void ieee80211_send_pspoll(struct ieee80211_local *local,
 897                            struct ieee80211_sub_if_data *sdata)
 898 {
 899         struct ieee80211_pspoll *pspoll;
 900         struct sk_buff *skb;
 901
 902         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 903         if (!skb)
 904                 return;
 905
 906         pspoll = (struct ieee80211_pspoll *) skb->data;
 907         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 908
 909         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 910         ieee80211_tx_skb(sdata, skb);
 911 }
 912
 913 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 914                              struct ieee80211_sub_if_data *sdata,
 915                              int powersave)
 916 {
 917         struct sk_buff *skb;
 918         struct ieee80211_hdr_3addr *nullfunc;
 919         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 920
 921         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 922         if (!skb)
 923                 return;
 924
 925         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 926         if (powersave)
 927                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 928
 929         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 930                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 931
 932         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 933                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 934
 935         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 936                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 937
 938         ieee80211_tx_skb(sdata, skb);
 939 }
 940
 941 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 942                                           struct ieee80211_sub_if_data *sdata)
 943 {
 944         struct sk_buff *skb;
 945         struct ieee80211_hdr *nullfunc;
 946         __le16 fc;
 947
 948         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 949                 return;
 950
 951         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 952         if (!skb)
 953                 return;
 954
 955         skb_reserve(skb, local->hw.extra_tx_headroom);
 956
 957         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 958         memset(nullfunc, 0, 30);
 959         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 960                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 961         nullfunc->frame_control = fc;
 962         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 963         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 964         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 965         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 966
 967         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 968         ieee80211_tx_skb(sdata, skb);
 969 }
 970
 971 /* spectrum management related things */
 972 static void ieee80211_chswitch_work(struct work_struct *work)
 973 {
 974         struct ieee80211_sub_if_data *sdata =
 975                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 976         struct ieee80211_local *local = sdata->local;
 977         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 978         int ret;
 979
 980         if (!ieee80211_sdata_running(sdata))
 981                 return;
 982
 983         sdata_lock(sdata);
 984         mutex_lock(&local->mtx);
 985         mutex_lock(&local->chanctx_mtx);
 986
 987         if (!ifmgd->associated)
 988                 goto out;
 989
 990         if (!sdata->vif.csa_active)
 991                 goto out;
 992
 993         /*
 994          * using reservation isn't immediate as it may be deferred until later
 995          * with multi-vif. once reservation is complete it will re-schedule the
 996          * work with no reserved_chanctx so verify chandef to check if it
 997          * completed successfully
 998          */
 999
1000         if (sdata->reserved_chanctx) {
1001                 /*
1002                  * with multi-vif csa driver may call ieee80211_csa_finish()
1003                  * many times while waiting for other interfaces to use their
1004                  * reservations
1005                  */
1006                 if (sdata->reserved_ready)
1007                         goto out;
1008
1009                 ret = ieee80211_vif_use_reserved_context(sdata);
1010                 if (ret) {
1011                         sdata_info(sdata,
1012                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1013                                    ret);
1014                         ieee80211_queue_work(&sdata->local->hw,
1015                                              &ifmgd->csa_connection_drop_work);
1016                         goto out;
1017                 }
1018
1019                 goto out;
1020         }
1021
1022         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1023                                         &sdata->csa_chandef)) {
1024                 sdata_info(sdata,
1025                            "failed to finalize channel switch, disconnecting\n");
1026                 ieee80211_queue_work(&sdata->local->hw,
1027                                      &ifmgd->csa_connection_drop_work);
1028                 goto out;
1029         }
1030
1031         /* XXX: shouldn't really modify cfg80211-owned data! */
1032         ifmgd->associated->channel = sdata->csa_chandef.chan;
1033
1034         ifmgd->csa_waiting_bcn = true;
1035
1036         ieee80211_sta_reset_beacon_monitor(sdata);
1037         ieee80211_sta_reset_conn_monitor(sdata);
1038
1039 out:
1040         mutex_unlock(&local->chanctx_mtx);
1041         mutex_unlock(&local->mtx);
1042         sdata_unlock(sdata);
1043 }
1044
1045 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1046 {
1047         struct ieee80211_local *local = sdata->local;
1048         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1049         int ret;
1050
1051         sdata_assert_lock(sdata);
1052
1053         WARN_ON(!sdata->vif.csa_active);
1054
1055         if (sdata->csa_block_tx) {
1056                 ieee80211_wake_vif_queues(local, sdata,
1057                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1058                 sdata->csa_block_tx = false;
1059         }
1060
1061         sdata->vif.csa_active = false;
1062         ifmgd->csa_waiting_bcn = false;
1063
1064         ret = drv_post_channel_switch(sdata);
1065         if (ret) {
1066                 sdata_info(sdata,
1067                            "driver post channel switch failed, disconnecting\n");
1068                 ieee80211_queue_work(&local->hw,
1069                                      &ifmgd->csa_connection_drop_work);
1070                 return;
1071         }
1072
1073         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1074 }
1075
1076 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1077 {
1078         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1079         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1080
1081         trace_api_chswitch_done(sdata, success);
1082         if (!success) {
1083                 sdata_info(sdata,
1084                            "driver channel switch failed, disconnecting\n");
1085                 ieee80211_queue_work(&sdata->local->hw,
1086                                      &ifmgd->csa_connection_drop_work);
1087         } else {
1088                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1089         }
1090 }
1091 EXPORT_SYMBOL(ieee80211_chswitch_done);
1092
1093 static void ieee80211_chswitch_timer(unsigned long data)
1094 {
1095         struct ieee80211_sub_if_data *sdata =
1096                 (struct ieee80211_sub_if_data *) data;
1097
1098         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1099 }
1100
1101 static void
1102 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1103                                  u64 timestamp, u32 device_timestamp,
1104                                  struct ieee802_11_elems *elems,
1105                                  bool beacon)
1106 {
1107         struct ieee80211_local *local = sdata->local;
1108         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1109         struct cfg80211_bss *cbss = ifmgd->associated;
1110         struct ieee80211_chanctx_conf *conf;
1111         struct ieee80211_chanctx *chanctx;
1112         enum ieee80211_band current_band;
1113         struct ieee80211_csa_ie csa_ie;
1114         struct ieee80211_channel_switch ch_switch;
1115         int res;
1116
1117         sdata_assert_lock(sdata);
1118
1119         if (!cbss)
1120                 return;
1121
1122         if (local->scanning)
1123                 return;
1124
1125         /* disregard subsequent announcements if we are already processing */
1126         if (sdata->vif.csa_active)
1127                 return;
1128
1129         current_band = cbss->channel->band;
1130         memset(&csa_ie, 0, sizeof(csa_ie));
1131         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1132                                            ifmgd->flags,
1133                                            ifmgd->associated->bssid, &csa_ie);
1134         if (res < 0)
1135                 ieee80211_queue_work(&local->hw,
1136                                      &ifmgd->csa_connection_drop_work);
1137         if (res)
1138                 return;
1139
1140         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1141                                      IEEE80211_CHAN_DISABLED)) {
1142                 sdata_info(sdata,
1143                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1144                            ifmgd->associated->bssid,
1145                            csa_ie.chandef.chan->center_freq,
1146                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1147                            csa_ie.chandef.center_freq2);
1148                 ieee80211_queue_work(&local->hw,
1149                                      &ifmgd->csa_connection_drop_work);
1150                 return;
1151         }
1152
1153         mutex_lock(&local->mtx);
1154         mutex_lock(&local->chanctx_mtx);
1155         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1156                                          lockdep_is_held(&local->chanctx_mtx));
1157         if (!conf) {
1158                 sdata_info(sdata,
1159                            "no channel context assigned to vif?, disconnecting\n");
1160                 ieee80211_queue_work(&local->hw,
1161                                      &ifmgd->csa_connection_drop_work);
1162                 mutex_unlock(&local->chanctx_mtx);
1163                 mutex_unlock(&local->mtx);
1164                 return;
1165         }
1166
1167         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1168
1169         if (local->use_chanctx &&
1170             !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1171                 sdata_info(sdata,
1172                            "driver doesn't support chan-switch with channel contexts\n");
1173                 ieee80211_queue_work(&local->hw,
1174                                      &ifmgd->csa_connection_drop_work);
1175                 mutex_unlock(&local->chanctx_mtx);
1176                 mutex_unlock(&local->mtx);
1177                 return;
1178         }
1179
1180         ch_switch.timestamp = timestamp;
1181         ch_switch.device_timestamp = device_timestamp;
1182         ch_switch.block_tx = csa_ie.mode;
1183         ch_switch.chandef = csa_ie.chandef;
1184         ch_switch.count = csa_ie.count;
1185
1186         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1187                 sdata_info(sdata,
1188                            "preparing for channel switch failed, disconnecting\n");
1189                 ieee80211_queue_work(&local->hw,
1190                                      &ifmgd->csa_connection_drop_work);
1191                 mutex_unlock(&local->chanctx_mtx);
1192                 mutex_unlock(&local->mtx);
1193                 return;
1194         }
1195
1196         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1197                                             chanctx->mode, false);
1198         if (res) {
1199                 sdata_info(sdata,
1200                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1201                            res);
1202                 ieee80211_queue_work(&local->hw,
1203                                      &ifmgd->csa_connection_drop_work);
1204                 mutex_unlock(&local->chanctx_mtx);
1205                 mutex_unlock(&local->mtx);
1206                 return;
1207         }
1208         mutex_unlock(&local->chanctx_mtx);
1209
1210         sdata->vif.csa_active = true;
1211         sdata->csa_chandef = csa_ie.chandef;
1212         sdata->csa_block_tx = csa_ie.mode;
1213
1214         if (sdata->csa_block_tx)
1215                 ieee80211_stop_vif_queues(local, sdata,
1216                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1217         mutex_unlock(&local->mtx);
1218
1219         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1220                                           csa_ie.count);
1221
1222         if (local->ops->channel_switch) {
1223                 /* use driver's channel switch callback */
1224                 drv_channel_switch(local, sdata, &ch_switch);
1225                 return;
1226         }
1227
1228         /* channel switch handled in software */
1229         if (csa_ie.count <= 1)
1230                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1231         else
1232                 mod_timer(&ifmgd->chswitch_timer,
1233                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1234                                          cbss->beacon_interval));
1235 }
1236
1237 static bool
1238 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1239                                  struct ieee80211_channel *channel,
1240                                  const u8 *country_ie, u8 country_ie_len,
1241                                  const u8 *pwr_constr_elem,
1242                                  int *chan_pwr, int *pwr_reduction)
1243 {
1244         struct ieee80211_country_ie_triplet *triplet;
1245         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1246         int i, chan_increment;
1247         bool have_chan_pwr = false;
1248
1249         /* Invalid IE */
1250         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1251                 return false;
1252
1253         triplet = (void *)(country_ie + 3);
1254         country_ie_len -= 3;
1255
1256         switch (channel->band) {
1257         default:
1258                 WARN_ON_ONCE(1);
1259                 /* fall through */
1260         case IEEE80211_BAND_2GHZ:
1261         case IEEE80211_BAND_60GHZ:
1262                 chan_increment = 1;
1263                 break;
1264         case IEEE80211_BAND_5GHZ:
1265                 chan_increment = 4;
1266                 break;
1267         }
1268
1269         /* find channel */
1270         while (country_ie_len >= 3) {
1271                 u8 first_channel = triplet->chans.first_channel;
1272
1273                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1274                         goto next;
1275
1276                 for (i = 0; i < triplet->chans.num_channels; i++) {
1277                         if (first_channel + i * chan_increment == chan) {
1278                                 have_chan_pwr = true;
1279                                 *chan_pwr = triplet->chans.max_power;
1280                                 break;
1281                         }
1282                 }
1283                 if (have_chan_pwr)
1284                         break;
1285
1286  next:
1287                 triplet++;
1288                 country_ie_len -= 3;
1289         }
1290
1291         if (have_chan_pwr && pwr_constr_elem)
1292                 *pwr_reduction = *pwr_constr_elem;
1293         else
1294                 *pwr_reduction = 0;
1295
1296         return have_chan_pwr;
1297 }
1298
1299 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1300                                       struct ieee80211_channel *channel,
1301                                       const u8 *cisco_dtpc_ie,
1302                                       int *pwr_level)
1303 {
1304         /* From practical testing, the first data byte of the DTPC element
1305          * seems to contain the requested dBm level, and the CLI on Cisco
1306          * APs clearly state the range is -127 to 127 dBm, which indicates
1307          * a signed byte, although it seemingly never actually goes negative.
1308          * The other byte seems to always be zero.
1309          */
1310         *pwr_level = (__s8)cisco_dtpc_ie[4];
1311 }
1312
1313 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1314                                        struct ieee80211_channel *channel,
1315                                        struct ieee80211_mgmt *mgmt,
1316                                        const u8 *country_ie, u8 country_ie_len,
1317                                        const u8 *pwr_constr_ie,
1318                                        const u8 *cisco_dtpc_ie)
1319 {
1320         bool has_80211h_pwr = false, has_cisco_pwr = false;
1321         int chan_pwr = 0, pwr_reduction_80211h = 0;
1322         int pwr_level_cisco, pwr_level_80211h;
1323         int new_ap_level;
1324         __le16 capab = mgmt->u.probe_resp.capab_info;
1325
1326         if (country_ie &&
1327             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1328              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1329                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1330                         sdata, channel, country_ie, country_ie_len,
1331                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1332                 pwr_level_80211h =
1333                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1334         }
1335
1336         if (cisco_dtpc_ie) {
1337                 ieee80211_find_cisco_dtpc(
1338                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1339                 has_cisco_pwr = true;
1340         }
1341
1342         if (!has_80211h_pwr && !has_cisco_pwr)
1343                 return 0;
1344
1345         /* If we have both 802.11h and Cisco DTPC, apply both limits
1346          * by picking the smallest of the two power levels advertised.
1347          */
1348         if (has_80211h_pwr &&
1349             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1350                 sdata_info(sdata,
1351                            "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1352                            pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1353                            sdata->u.mgd.bssid);
1354                 new_ap_level = pwr_level_80211h;
1355         } else {  /* has_cisco_pwr is always true here. */
1356                 sdata_info(sdata,
1357                            "Limiting TX power to %d dBm as advertised by %pM\n",
1358                            pwr_level_cisco, sdata->u.mgd.bssid);
1359                 new_ap_level = pwr_level_cisco;
1360         }
1361
1362         if (sdata->ap_power_level == new_ap_level)
1363                 return 0;
1364
1365         sdata->ap_power_level = new_ap_level;
1366         if (__ieee80211_recalc_txpower(sdata))
1367                 return BSS_CHANGED_TXPOWER;
1368         return 0;
1369 }
1370
1371 /* powersave */
1372 static void ieee80211_enable_ps(struct ieee80211_local *local,
1373                                 struct ieee80211_sub_if_data *sdata)
1374 {
1375         struct ieee80211_conf *conf = &local->hw.conf;
1376
1377         /*
1378          * If we are scanning right now then the parameters will
1379          * take effect when scan finishes.
1380          */
1381         if (local->scanning)
1382                 return;
1383
1384         if (conf->dynamic_ps_timeout > 0 &&
1385             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1386                 mod_timer(&local->dynamic_ps_timer, jiffies +
1387                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1388         } else {
1389                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1390                         ieee80211_send_nullfunc(local, sdata, 1);
1391
1392                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1393                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1394                         return;
1395
1396                 conf->flags |= IEEE80211_CONF_PS;
1397                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1398         }
1399 }
1400
1401 static void ieee80211_change_ps(struct ieee80211_local *local)
1402 {
1403         struct ieee80211_conf *conf = &local->hw.conf;
1404
1405         if (local->ps_sdata) {
1406                 ieee80211_enable_ps(local, local->ps_sdata);
1407         } else if (conf->flags & IEEE80211_CONF_PS) {
1408                 conf->flags &= ~IEEE80211_CONF_PS;
1409                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1410                 del_timer_sync(&local->dynamic_ps_timer);
1411                 cancel_work_sync(&local->dynamic_ps_enable_work);
1412         }
1413 }
1414
1415 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1416 {
1417         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1418         struct sta_info *sta = NULL;
1419         bool authorized = false;
1420
1421         if (!mgd->powersave)
1422                 return false;
1423
1424         if (mgd->broken_ap)
1425                 return false;
1426
1427         if (!mgd->associated)
1428                 return false;
1429
1430         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1431                 return false;
1432
1433         if (!mgd->have_beacon)
1434                 return false;
1435
1436         rcu_read_lock();
1437         sta = sta_info_get(sdata, mgd->bssid);
1438         if (sta)
1439                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1440         rcu_read_unlock();
1441
1442         return authorized;
1443 }
1444
1445 /* need to hold RTNL or interface lock */
1446 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1447 {
1448         struct ieee80211_sub_if_data *sdata, *found = NULL;
1449         int count = 0;
1450         int timeout;
1451
1452         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1453                 local->ps_sdata = NULL;
1454                 return;
1455         }
1456
1457         list_for_each_entry(sdata, &local->interfaces, list) {
1458                 if (!ieee80211_sdata_running(sdata))
1459                         continue;
1460                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1461                         /* If an AP vif is found, then disable PS
1462                          * by setting the count to zero thereby setting
1463                          * ps_sdata to NULL.
1464                          */
1465                         count = 0;
1466                         break;
1467                 }
1468                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1469                         continue;
1470                 found = sdata;
1471                 count++;
1472         }
1473
1474         if (count == 1 && ieee80211_powersave_allowed(found)) {
1475                 s32 beaconint_us;
1476
1477                 if (latency < 0)
1478                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1479
1480                 beaconint_us = ieee80211_tu_to_usec(
1481                                         found->vif.bss_conf.beacon_int);
1482
1483                 timeout = local->dynamic_ps_forced_timeout;
1484                 if (timeout < 0) {
1485                         /*
1486                          * Go to full PSM if the user configures a very low
1487                          * latency requirement.
1488                          * The 2000 second value is there for compatibility
1489                          * until the PM_QOS_NETWORK_LATENCY is configured
1490                          * with real values.
1491                          */
1492                         if (latency > (1900 * USEC_PER_MSEC) &&
1493                             latency != (2000 * USEC_PER_SEC))
1494                                 timeout = 0;
1495                         else
1496                                 timeout = 100;
1497                 }
1498                 local->hw.conf.dynamic_ps_timeout = timeout;
1499
1500                 if (beaconint_us > latency) {
1501                         local->ps_sdata = NULL;
1502                 } else {
1503                         int maxslp = 1;
1504                         u8 dtimper = found->u.mgd.dtim_period;
1505
1506                         /* If the TIM IE is invalid, pretend the value is 1 */
1507                         if (!dtimper)
1508                                 dtimper = 1;
1509                         else if (dtimper > 1)
1510                                 maxslp = min_t(int, dtimper,
1511                                                     latency / beaconint_us);
1512
1513                         local->hw.conf.max_sleep_period = maxslp;
1514                         local->hw.conf.ps_dtim_period = dtimper;
1515                         local->ps_sdata = found;
1516                 }
1517         } else {
1518                 local->ps_sdata = NULL;
1519         }
1520
1521         ieee80211_change_ps(local);
1522 }
1523
1524 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1525 {
1526         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1527
1528         if (sdata->vif.bss_conf.ps != ps_allowed) {
1529                 sdata->vif.bss_conf.ps = ps_allowed;
1530                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1531         }
1532 }
1533
1534 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1535 {
1536         struct ieee80211_local *local =
1537                 container_of(work, struct ieee80211_local,
1538                              dynamic_ps_disable_work);
1539
1540         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1541                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1542                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1543         }
1544
1545         ieee80211_wake_queues_by_reason(&local->hw,
1546                                         IEEE80211_MAX_QUEUE_MAP,
1547                                         IEEE80211_QUEUE_STOP_REASON_PS,
1548                                         false);
1549 }
1550
1551 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1552 {
1553         struct ieee80211_local *local =
1554                 container_of(work, struct ieee80211_local,
1555                              dynamic_ps_enable_work);
1556         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1557         struct ieee80211_if_managed *ifmgd;
1558         unsigned long flags;
1559         int q;
1560
1561         /* can only happen when PS was just disabled anyway */
1562         if (!sdata)
1563                 return;
1564
1565         ifmgd = &sdata->u.mgd;
1566
1567         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1568                 return;
1569
1570         if (local->hw.conf.dynamic_ps_timeout > 0) {
1571                 /* don't enter PS if TX frames are pending */
1572                 if (drv_tx_frames_pending(local)) {
1573                         mod_timer(&local->dynamic_ps_timer, jiffies +
1574                                   msecs_to_jiffies(
1575                                   local->hw.conf.dynamic_ps_timeout));
1576                         return;
1577                 }
1578
1579                 /*
1580                  * transmission can be stopped by others which leads to
1581                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1582                  * is not the actual idle state.
1583                  */
1584                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1585                 for (q = 0; q < local->hw.queues; q++) {
1586                         if (local->queue_stop_reasons[q]) {
1587                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1588                                                        flags);
1589                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1590                                           msecs_to_jiffies(
1591                                           local->hw.conf.dynamic_ps_timeout));
1592                                 return;
1593                         }
1594                 }
1595                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1596         }
1597
1598         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1599             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1600                 if (drv_tx_frames_pending(local)) {
1601                         mod_timer(&local->dynamic_ps_timer, jiffies +
1602                                   msecs_to_jiffies(
1603                                   local->hw.conf.dynamic_ps_timeout));
1604                 } else {
1605                         ieee80211_send_nullfunc(local, sdata, 1);
1606                         /* Flush to get the tx status of nullfunc frame */
1607                         ieee80211_flush_queues(local, sdata, false);
1608                 }
1609         }
1610
1611         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1612               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1613             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1614                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1615                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1616                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1617         }
1618 }
1619
1620 void ieee80211_dynamic_ps_timer(unsigned long data)
1621 {
1622         struct ieee80211_local *local = (void *) data;
1623
1624         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1625 }
1626
1627 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1628 {
1629         struct delayed_work *delayed_work =
1630                 container_of(work, struct delayed_work, work);
1631         struct ieee80211_sub_if_data *sdata =
1632                 container_of(delayed_work, struct ieee80211_sub_if_data,
1633                              dfs_cac_timer_work);
1634         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1635
1636         mutex_lock(&sdata->local->mtx);
1637         if (sdata->wdev.cac_started) {
1638                 ieee80211_vif_release_channel(sdata);
1639                 cfg80211_cac_event(sdata->dev, &chandef,
1640                                    NL80211_RADAR_CAC_FINISHED,
1641                                    GFP_KERNEL);
1642         }
1643         mutex_unlock(&sdata->local->mtx);
1644 }
1645
1646 static bool
1647 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1648 {
1649         struct ieee80211_local *local = sdata->local;
1650         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1651         bool ret = false;
1652         int ac;
1653
1654         if (local->hw.queues < IEEE80211_NUM_ACS)
1655                 return false;
1656
1657         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1658                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1659                 int non_acm_ac;
1660                 unsigned long now = jiffies;
1661
1662                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1663                     tx_tspec->admitted_time &&
1664                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1665                         tx_tspec->consumed_tx_time = 0;
1666                         tx_tspec->time_slice_start = now;
1667
1668                         if (tx_tspec->downgraded)
1669                                 tx_tspec->action =
1670                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1671                 }
1672
1673                 switch (tx_tspec->action) {
1674                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1675                         /* take the original parameters */
1676                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1677                                 sdata_err(sdata,
1678                                           "failed to set TX queue parameters for queue %d\n",
1679                                           ac);
1680                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1681                         tx_tspec->downgraded = false;
1682                         ret = true;
1683                         break;
1684                 case TX_TSPEC_ACTION_DOWNGRADE:
1685                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1686                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1687                                 ret = true;
1688                                 break;
1689                         }
1690                         /* downgrade next lower non-ACM AC */
1691                         for (non_acm_ac = ac + 1;
1692                              non_acm_ac < IEEE80211_NUM_ACS;
1693                              non_acm_ac++)
1694                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1695                                         break;
1696                         /* The loop will result in using BK even if it requires
1697                          * admission control, such configuration makes no sense
1698                          * and we have to transmit somehow - the AC selection
1699                          * does the same thing.
1700                          */
1701                         if (drv_conf_tx(local, sdata, ac,
1702                                         &sdata->tx_conf[non_acm_ac]))
1703                                 sdata_err(sdata,
1704                                           "failed to set TX queue parameters for queue %d\n",
1705                                           ac);
1706                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1707                         ret = true;
1708                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1709                                 tx_tspec->time_slice_start + HZ - now + 1);
1710                         break;
1711                 case TX_TSPEC_ACTION_NONE:
1712                         /* nothing now */
1713                         break;
1714                 }
1715         }
1716
1717         return ret;
1718 }
1719
1720 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1721 {
1722         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1723                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1724 }
1725
1726 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1727 {
1728         struct ieee80211_sub_if_data *sdata;
1729
1730         sdata = container_of(work, struct ieee80211_sub_if_data,
1731                              u.mgd.tx_tspec_wk.work);
1732         ieee80211_sta_handle_tspec_ac_params(sdata);
1733 }
1734
1735 /* MLME */
1736 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1737                                      struct ieee80211_sub_if_data *sdata,
1738                                      const u8 *wmm_param, size_t wmm_param_len)
1739 {
1740         struct ieee80211_tx_queue_params params;
1741         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1742         size_t left;
1743         int count;
1744         const u8 *pos;
1745         u8 uapsd_queues = 0;
1746
1747         if (!local->ops->conf_tx)
1748                 return false;
1749
1750         if (local->hw.queues < IEEE80211_NUM_ACS)
1751                 return false;
1752
1753         if (!wmm_param)
1754                 return false;
1755
1756         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1757                 return false;
1758
1759         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1760                 uapsd_queues = ifmgd->uapsd_queues;
1761
1762         count = wmm_param[6] & 0x0f;
1763         if (count == ifmgd->wmm_last_param_set)
1764                 return false;
1765         ifmgd->wmm_last_param_set = count;
1766
1767         pos = wmm_param + 8;
1768         left = wmm_param_len - 8;
1769
1770         memset(&params, 0, sizeof(params));
1771
1772         sdata->wmm_acm = 0;
1773         for (; left >= 4; left -= 4, pos += 4) {
1774                 int aci = (pos[0] >> 5) & 0x03;
1775                 int acm = (pos[0] >> 4) & 0x01;
1776                 bool uapsd = false;
1777                 int queue;
1778
1779                 switch (aci) {
1780                 case 1: /* AC_BK */
1781                         queue = 3;
1782                         if (acm)
1783                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1784                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1785                                 uapsd = true;
1786                         break;
1787                 case 2: /* AC_VI */
1788                         queue = 1;
1789                         if (acm)
1790                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1791                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1792                                 uapsd = true;
1793                         break;
1794                 case 3: /* AC_VO */
1795                         queue = 0;
1796                         if (acm)
1797                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1798                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1799                                 uapsd = true;
1800                         break;
1801                 case 0: /* AC_BE */
1802                 default:
1803                         queue = 2;
1804                         if (acm)
1805                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1806                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1807                                 uapsd = true;
1808                         break;
1809                 }
1810
1811                 params.aifs = pos[0] & 0x0f;
1812                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1813                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1814                 params.txop = get_unaligned_le16(pos + 2);
1815                 params.acm = acm;
1816                 params.uapsd = uapsd;
1817
1818                 mlme_dbg(sdata,
1819                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1820                          queue, aci, acm,
1821                          params.aifs, params.cw_min, params.cw_max,
1822                          params.txop, params.uapsd,
1823                          ifmgd->tx_tspec[queue].downgraded);
1824                 sdata->tx_conf[queue] = params;
1825                 if (!ifmgd->tx_tspec[queue].downgraded &&
1826                     drv_conf_tx(local, sdata, queue, &params))
1827                         sdata_err(sdata,
1828                                   "failed to set TX queue parameters for queue %d\n",
1829                                   queue);
1830         }
1831
1832         /* enable WMM or activate new settings */
1833         sdata->vif.bss_conf.qos = true;
1834         return true;
1835 }
1836
1837 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1838 {
1839         lockdep_assert_held(&sdata->local->mtx);
1840
1841         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1842         ieee80211_run_deferred_scan(sdata->local);
1843 }
1844
1845 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1846 {
1847         mutex_lock(&sdata->local->mtx);
1848         __ieee80211_stop_poll(sdata);
1849         mutex_unlock(&sdata->local->mtx);
1850 }
1851
1852 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1853                                            u16 capab, bool erp_valid, u8 erp)
1854 {
1855         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1856         u32 changed = 0;
1857         bool use_protection;
1858         bool use_short_preamble;
1859         bool use_short_slot;
1860
1861         if (erp_valid) {
1862                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1863                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1864         } else {
1865                 use_protection = false;
1866                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1867         }
1868
1869         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1870         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1871                 use_short_slot = true;
1872
1873         if (use_protection != bss_conf->use_cts_prot) {
1874                 bss_conf->use_cts_prot = use_protection;
1875                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1876         }
1877
1878         if (use_short_preamble != bss_conf->use_short_preamble) {
1879                 bss_conf->use_short_preamble = use_short_preamble;
1880                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1881         }
1882
1883         if (use_short_slot != bss_conf->use_short_slot) {
1884                 bss_conf->use_short_slot = use_short_slot;
1885                 changed |= BSS_CHANGED_ERP_SLOT;
1886         }
1887
1888         return changed;
1889 }
1890
1891 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1892                                      struct cfg80211_bss *cbss,
1893                                      u32 bss_info_changed)
1894 {
1895         struct ieee80211_bss *bss = (void *)cbss->priv;
1896         struct ieee80211_local *local = sdata->local;
1897         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1898
1899         bss_info_changed |= BSS_CHANGED_ASSOC;
1900         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1901                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1902
1903         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1904                 beacon_loss_count * bss_conf->beacon_int));
1905
1906         sdata->u.mgd.associated = cbss;
1907         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1908
1909         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1910
1911         if (sdata->vif.p2p) {
1912                 const struct cfg80211_bss_ies *ies;
1913
1914                 rcu_read_lock();
1915                 ies = rcu_dereference(cbss->ies);
1916                 if (ies) {
1917                         int ret;
1918
1919                         ret = cfg80211_get_p2p_attr(
1920                                         ies->data, ies->len,
1921                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1922                                         (u8 *) &bss_conf->p2p_noa_attr,
1923                                         sizeof(bss_conf->p2p_noa_attr));
1924                         if (ret >= 2) {
1925                                 sdata->u.mgd.p2p_noa_index =
1926                                         bss_conf->p2p_noa_attr.index;
1927                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1928                         }
1929                 }
1930                 rcu_read_unlock();
1931         }
1932
1933         /* just to be sure */
1934         ieee80211_stop_poll(sdata);
1935
1936         ieee80211_led_assoc(local, 1);
1937
1938         if (sdata->u.mgd.have_beacon) {
1939                 /*
1940                  * If the AP is buggy we may get here with no DTIM period
1941                  * known, so assume it's 1 which is the only safe assumption
1942                  * in that case, although if the TIM IE is broken powersave
1943                  * probably just won't work at all.
1944                  */
1945                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1946                 bss_conf->beacon_rate = bss->beacon_rate;
1947                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1948         } else {
1949                 bss_conf->beacon_rate = NULL;
1950                 bss_conf->dtim_period = 0;
1951         }
1952
1953         bss_conf->assoc = 1;
1954
1955         /* Tell the driver to monitor connection quality (if supported) */
1956         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1957             bss_conf->cqm_rssi_thold)
1958                 bss_info_changed |= BSS_CHANGED_CQM;
1959
1960         /* Enable ARP filtering */
1961         if (bss_conf->arp_addr_cnt)
1962                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1963
1964         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1965
1966         mutex_lock(&local->iflist_mtx);
1967         ieee80211_recalc_ps(local, -1);
1968         mutex_unlock(&local->iflist_mtx);
1969
1970         ieee80211_recalc_smps(sdata);
1971         ieee80211_recalc_ps_vif(sdata);
1972
1973         netif_carrier_on(sdata->dev);
1974 }
1975
1976 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1977                                    u16 stype, u16 reason, bool tx,
1978                                    u8 *frame_buf)
1979 {
1980         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1981         struct ieee80211_local *local = sdata->local;
1982         u32 changed = 0;
1983
1984         sdata_assert_lock(sdata);
1985
1986         if (WARN_ON_ONCE(tx && !frame_buf))
1987                 return;
1988
1989         if (WARN_ON(!ifmgd->associated))
1990                 return;
1991
1992         ieee80211_stop_poll(sdata);
1993
1994         ifmgd->associated = NULL;
1995         netif_carrier_off(sdata->dev);
1996
1997         /*
1998          * if we want to get out of ps before disassoc (why?) we have
1999          * to do it before sending disassoc, as otherwise the null-packet
2000          * won't be valid.
2001          */
2002         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2003                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2004                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2005         }
2006         local->ps_sdata = NULL;
2007
2008         /* disable per-vif ps */
2009         ieee80211_recalc_ps_vif(sdata);
2010
2011         /* make sure ongoing transmission finishes */
2012         synchronize_net();
2013
2014         /*
2015          * drop any frame before deauth/disassoc, this can be data or
2016          * management frame. Since we are disconnecting, we should not
2017          * insist sending these frames which can take time and delay
2018          * the disconnection and possible the roaming.
2019          */
2020         if (tx)
2021                 ieee80211_flush_queues(local, sdata, true);
2022
2023         /* deauthenticate/disassociate now */
2024         if (tx || frame_buf)
2025                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2026                                                reason, tx, frame_buf);
2027
2028         /* flush out frame - make sure the deauth was actually sent */
2029         if (tx)
2030                 ieee80211_flush_queues(local, sdata, false);
2031
2032         /* clear bssid only after building the needed mgmt frames */
2033         memset(ifmgd->bssid, 0, ETH_ALEN);
2034
2035         /* remove AP and TDLS peers */
2036         sta_info_flush(sdata);
2037
2038         /* finally reset all BSS / config parameters */
2039         changed |= ieee80211_reset_erp_info(sdata);
2040
2041         ieee80211_led_assoc(local, 0);
2042         changed |= BSS_CHANGED_ASSOC;
2043         sdata->vif.bss_conf.assoc = false;
2044
2045         ifmgd->p2p_noa_index = -1;
2046         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2047                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2048
2049         /* on the next assoc, re-program HT/VHT parameters */
2050         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2051         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2052         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2053         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2054
2055         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2056
2057         del_timer_sync(&local->dynamic_ps_timer);
2058         cancel_work_sync(&local->dynamic_ps_enable_work);
2059
2060         /* Disable ARP filtering */
2061         if (sdata->vif.bss_conf.arp_addr_cnt)
2062                 changed |= BSS_CHANGED_ARP_FILTER;
2063
2064         sdata->vif.bss_conf.qos = false;
2065         changed |= BSS_CHANGED_QOS;
2066
2067         /* The BSSID (not really interesting) and HT changed */
2068         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2069         ieee80211_bss_info_change_notify(sdata, changed);
2070
2071         /* disassociated - set to defaults now */
2072         ieee80211_set_wmm_default(sdata, false);
2073
2074         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2075         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2076         del_timer_sync(&sdata->u.mgd.timer);
2077         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2078
2079         sdata->vif.bss_conf.dtim_period = 0;
2080         sdata->vif.bss_conf.beacon_rate = NULL;
2081
2082         ifmgd->have_beacon = false;
2083
2084         ifmgd->flags = 0;
2085         mutex_lock(&local->mtx);
2086         ieee80211_vif_release_channel(sdata);
2087
2088         sdata->vif.csa_active = false;
2089         ifmgd->csa_waiting_bcn = false;
2090         if (sdata->csa_block_tx) {
2091                 ieee80211_wake_vif_queues(local, sdata,
2092                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2093                 sdata->csa_block_tx = false;
2094         }
2095         mutex_unlock(&local->mtx);
2096
2097         /* existing TX TSPEC sessions no longer exist */
2098         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2099         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2100
2101         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2102 }
2103
2104 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2105                              struct ieee80211_hdr *hdr)
2106 {
2107         /*
2108          * We can postpone the mgd.timer whenever receiving unicast frames
2109          * from AP because we know that the connection is working both ways
2110          * at that time. But multicast frames (and hence also beacons) must
2111          * be ignored here, because we need to trigger the timer during
2112          * data idle periods for sending the periodic probe request to the
2113          * AP we're connected to.
2114          */
2115         if (is_multicast_ether_addr(hdr->addr1))
2116                 return;
2117
2118         ieee80211_sta_reset_conn_monitor(sdata);
2119 }
2120
2121 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2122 {
2123         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2124         struct ieee80211_local *local = sdata->local;
2125
2126         mutex_lock(&local->mtx);
2127         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2128                 goto out;
2129
2130         __ieee80211_stop_poll(sdata);
2131
2132         mutex_lock(&local->iflist_mtx);
2133         ieee80211_recalc_ps(local, -1);
2134         mutex_unlock(&local->iflist_mtx);
2135
2136         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2137                 goto out;
2138
2139         /*
2140          * We've received a probe response, but are not sure whether
2141          * we have or will be receiving any beacons or data, so let's
2142          * schedule the timers again, just in case.
2143          */
2144         ieee80211_sta_reset_beacon_monitor(sdata);
2145
2146         mod_timer(&ifmgd->conn_mon_timer,
2147                   round_jiffies_up(jiffies +
2148                                    IEEE80211_CONNECTION_IDLE_TIME));
2149 out:
2150         mutex_unlock(&local->mtx);
2151 }
2152
2153 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2154                                            struct ieee80211_hdr *hdr,
2155                                            u16 tx_time)
2156 {
2157         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2158         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2159         int ac = ieee80211_ac_from_tid(tid);
2160         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2161         unsigned long now = jiffies;
2162
2163         if (likely(!tx_tspec->admitted_time))
2164                 return;
2165
2166         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2167                 tx_tspec->consumed_tx_time = 0;
2168                 tx_tspec->time_slice_start = now;
2169
2170                 if (tx_tspec->downgraded) {
2171                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2172                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2173                 }
2174         }
2175
2176         if (tx_tspec->downgraded)
2177                 return;
2178
2179         tx_tspec->consumed_tx_time += tx_time;
2180
2181         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2182                 tx_tspec->downgraded = true;
2183                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2184                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2185         }
2186 }
2187
2188 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2189                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2190 {
2191         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2192
2193         if (!ieee80211_is_data(hdr->frame_control))
2194             return;
2195
2196         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2197             sdata->u.mgd.probe_send_count > 0) {
2198                 if (ack)
2199                         ieee80211_sta_reset_conn_monitor(sdata);
2200                 else
2201                         sdata->u.mgd.nullfunc_failed = true;
2202                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2203                 return;
2204         }
2205
2206         if (ack)
2207                 ieee80211_sta_reset_conn_monitor(sdata);
2208 }
2209
2210 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2211 {
2212         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2213         const u8 *ssid;
2214         u8 *dst = ifmgd->associated->bssid;
2215         u8 unicast_limit = max(1, max_probe_tries - 3);
2216
2217         /*
2218          * Try sending broadcast probe requests for the last three
2219          * probe requests after the first ones failed since some
2220          * buggy APs only support broadcast probe requests.
2221          */
2222         if (ifmgd->probe_send_count >= unicast_limit)
2223                 dst = NULL;
2224
2225         /*
2226          * When the hardware reports an accurate Tx ACK status, it's
2227          * better to send a nullfunc frame instead of a probe request,
2228          * as it will kick us off the AP quickly if we aren't associated
2229          * anymore. The timeout will be reset if the frame is ACKed by
2230          * the AP.
2231          */
2232         ifmgd->probe_send_count++;
2233
2234         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2235                 ifmgd->nullfunc_failed = false;
2236                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2237         } else {
2238                 int ssid_len;
2239
2240                 rcu_read_lock();
2241                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2242                 if (WARN_ON_ONCE(ssid == NULL))
2243                         ssid_len = 0;
2244                 else
2245                         ssid_len = ssid[1];
2246
2247                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
2248                                          ssid + 2, ssid_len, NULL,
2249                                          0, (u32) -1, true, 0,
2250                                          ifmgd->associated->channel, false);
2251                 rcu_read_unlock();
2252         }
2253
2254         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2255         run_again(sdata, ifmgd->probe_timeout);
2256 }
2257
2258 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2259                                    bool beacon)
2260 {
2261         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2262         bool already = false;
2263
2264         if (!ieee80211_sdata_running(sdata))
2265                 return;
2266
2267         sdata_lock(sdata);
2268
2269         if (!ifmgd->associated)
2270                 goto out;
2271
2272         mutex_lock(&sdata->local->mtx);
2273
2274         if (sdata->local->tmp_channel || sdata->local->scanning) {
2275                 mutex_unlock(&sdata->local->mtx);
2276                 goto out;
2277         }
2278
2279         if (beacon) {
2280                 mlme_dbg_ratelimited(sdata,
2281                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2282                                      beacon_loss_count);
2283
2284                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2285         }
2286
2287         /*
2288          * The driver/our work has already reported this event or the
2289          * connection monitoring has kicked in and we have already sent
2290          * a probe request. Or maybe the AP died and the driver keeps
2291          * reporting until we disassociate...
2292          *
2293          * In either case we have to ignore the current call to this
2294          * function (except for setting the correct probe reason bit)
2295          * because otherwise we would reset the timer every time and
2296          * never check whether we received a probe response!
2297          */
2298         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2299                 already = true;
2300
2301         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2302
2303         mutex_unlock(&sdata->local->mtx);
2304
2305         if (already)
2306                 goto out;
2307
2308         mutex_lock(&sdata->local->iflist_mtx);
2309         ieee80211_recalc_ps(sdata->local, -1);
2310         mutex_unlock(&sdata->local->iflist_mtx);
2311
2312         ifmgd->probe_send_count = 0;
2313         ieee80211_mgd_probe_ap_send(sdata);
2314  out:
2315         sdata_unlock(sdata);
2316 }
2317
2318 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2319                                           struct ieee80211_vif *vif)
2320 {
2321         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2322         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2323         struct cfg80211_bss *cbss;
2324         struct sk_buff *skb;
2325         const u8 *ssid;
2326         int ssid_len;
2327
2328         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2329                 return NULL;
2330
2331         sdata_assert_lock(sdata);
2332
2333         if (ifmgd->associated)
2334                 cbss = ifmgd->associated;
2335         else if (ifmgd->auth_data)
2336                 cbss = ifmgd->auth_data->bss;
2337         else if (ifmgd->assoc_data)
2338                 cbss = ifmgd->assoc_data->bss;
2339         else
2340                 return NULL;
2341
2342         rcu_read_lock();
2343         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2344         if (WARN_ON_ONCE(ssid == NULL))
2345                 ssid_len = 0;
2346         else
2347                 ssid_len = ssid[1];
2348
2349         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2350                                         (u32) -1, cbss->channel,
2351                                         ssid + 2, ssid_len,
2352                                         NULL, 0, true);
2353         rcu_read_unlock();
2354
2355         return skb;
2356 }
2357 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2358
2359 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2360 {
2361         struct ieee80211_local *local = sdata->local;
2362         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2363         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2364
2365         sdata_lock(sdata);
2366         if (!ifmgd->associated) {
2367                 sdata_unlock(sdata);
2368                 return;
2369         }
2370
2371         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2372                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2373                                true, frame_buf);
2374         mutex_lock(&local->mtx);
2375         sdata->vif.csa_active = false;
2376         ifmgd->csa_waiting_bcn = false;
2377         if (sdata->csa_block_tx) {
2378                 ieee80211_wake_vif_queues(local, sdata,
2379                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2380                 sdata->csa_block_tx = false;
2381         }
2382         mutex_unlock(&local->mtx);
2383
2384         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2385                               IEEE80211_DEAUTH_FRAME_LEN);
2386         sdata_unlock(sdata);
2387 }
2388
2389 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2390 {
2391         struct ieee80211_sub_if_data *sdata =
2392                 container_of(work, struct ieee80211_sub_if_data,
2393                              u.mgd.beacon_connection_loss_work);
2394         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2395         struct sta_info *sta;
2396
2397         if (ifmgd->associated) {
2398                 rcu_read_lock();
2399                 sta = sta_info_get(sdata, ifmgd->bssid);
2400                 if (sta)
2401                         sta->beacon_loss_count++;
2402                 rcu_read_unlock();
2403         }
2404
2405         if (ifmgd->connection_loss) {
2406                 sdata_info(sdata, "Connection to AP %pM lost\n",
2407                            ifmgd->bssid);
2408                 __ieee80211_disconnect(sdata);
2409         } else {
2410                 ieee80211_mgd_probe_ap(sdata, true);
2411         }
2412 }
2413
2414 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2415 {
2416         struct ieee80211_sub_if_data *sdata =
2417                 container_of(work, struct ieee80211_sub_if_data,
2418                              u.mgd.csa_connection_drop_work);
2419
2420         __ieee80211_disconnect(sdata);
2421 }
2422
2423 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2424 {
2425         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2426         struct ieee80211_hw *hw = &sdata->local->hw;
2427
2428         trace_api_beacon_loss(sdata);
2429
2430         sdata->u.mgd.connection_loss = false;
2431         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2432 }
2433 EXPORT_SYMBOL(ieee80211_beacon_loss);
2434
2435 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2436 {
2437         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2438         struct ieee80211_hw *hw = &sdata->local->hw;
2439
2440         trace_api_connection_loss(sdata);
2441
2442         sdata->u.mgd.connection_loss = true;
2443         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2444 }
2445 EXPORT_SYMBOL(ieee80211_connection_loss);
2446
2447
2448 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2449                                         bool assoc)
2450 {
2451         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2452
2453         sdata_assert_lock(sdata);
2454
2455         if (!assoc) {
2456                 /*
2457                  * we are not authenticated yet, the only timer that could be
2458                  * running is the timeout for the authentication response which
2459                  * which is not relevant anymore.
2460                  */
2461                 del_timer_sync(&sdata->u.mgd.timer);
2462                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2463
2464                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2465                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2466                 sdata->u.mgd.flags = 0;
2467                 mutex_lock(&sdata->local->mtx);
2468                 ieee80211_vif_release_channel(sdata);
2469                 mutex_unlock(&sdata->local->mtx);
2470         }
2471
2472         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2473         kfree(auth_data);
2474         sdata->u.mgd.auth_data = NULL;
2475 }
2476
2477 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2478                                      struct ieee80211_mgmt *mgmt, size_t len)
2479 {
2480         struct ieee80211_local *local = sdata->local;
2481         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2482         u8 *pos;
2483         struct ieee802_11_elems elems;
2484         u32 tx_flags = 0;
2485
2486         pos = mgmt->u.auth.variable;
2487         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2488         if (!elems.challenge)
2489                 return;
2490         auth_data->expected_transaction = 4;
2491         drv_mgd_prepare_tx(sdata->local, sdata);
2492         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2493                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2494                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2495         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2496                             elems.challenge - 2, elems.challenge_len + 2,
2497                             auth_data->bss->bssid, auth_data->bss->bssid,
2498                             auth_data->key, auth_data->key_len,
2499                             auth_data->key_idx, tx_flags);
2500 }
2501
2502 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2503                                    struct ieee80211_mgmt *mgmt, size_t len)
2504 {
2505         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2506         u8 bssid[ETH_ALEN];
2507         u16 auth_alg, auth_transaction, status_code;
2508         struct sta_info *sta;
2509
2510         sdata_assert_lock(sdata);
2511
2512         if (len < 24 + 6)
2513                 return;
2514
2515         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2516                 return;
2517
2518         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2519
2520         if (!ether_addr_equal(bssid, mgmt->bssid))
2521                 return;
2522
2523         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2524         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2525         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2526
2527         if (auth_alg != ifmgd->auth_data->algorithm ||
2528             auth_transaction != ifmgd->auth_data->expected_transaction) {
2529                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2530                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2531                            auth_transaction,
2532                            ifmgd->auth_data->expected_transaction);
2533                 return;
2534         }
2535
2536         if (status_code != WLAN_STATUS_SUCCESS) {
2537                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2538                            mgmt->sa, status_code);
2539                 ieee80211_destroy_auth_data(sdata, false);
2540                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2541                 return;
2542         }
2543
2544         switch (ifmgd->auth_data->algorithm) {
2545         case WLAN_AUTH_OPEN:
2546         case WLAN_AUTH_LEAP:
2547         case WLAN_AUTH_FT:
2548         case WLAN_AUTH_SAE:
2549                 break;
2550         case WLAN_AUTH_SHARED_KEY:
2551                 if (ifmgd->auth_data->expected_transaction != 4) {
2552                         ieee80211_auth_challenge(sdata, mgmt, len);
2553                         /* need another frame */
2554                         return;
2555                 }
2556                 break;
2557         default:
2558                 WARN_ONCE(1, "invalid auth alg %d",
2559                           ifmgd->auth_data->algorithm);
2560                 return;
2561         }
2562
2563         sdata_info(sdata, "authenticated\n");
2564         ifmgd->auth_data->done = true;
2565         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2566         ifmgd->auth_data->timeout_started = true;
2567         run_again(sdata, ifmgd->auth_data->timeout);
2568
2569         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2570             ifmgd->auth_data->expected_transaction != 2) {
2571                 /*
2572                  * Report auth frame to user space for processing since another
2573                  * round of Authentication frames is still needed.
2574                  */
2575                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2576                 return;
2577         }
2578
2579         /* move station state to auth */
2580         mutex_lock(&sdata->local->sta_mtx);
2581         sta = sta_info_get(sdata, bssid);
2582         if (!sta) {
2583                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2584                 goto out_err;
2585         }
2586         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2587                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2588                 goto out_err;
2589         }
2590         mutex_unlock(&sdata->local->sta_mtx);
2591
2592         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2593         return;
2594  out_err:
2595         mutex_unlock(&sdata->local->sta_mtx);
2596         /* ignore frame -- wait for timeout */
2597 }
2598
2599 #define case_WLAN(type) \
2600         case WLAN_REASON_##type: return #type
2601
2602 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2603 {
2604         switch (reason_code) {
2605         case_WLAN(UNSPECIFIED);
2606         case_WLAN(PREV_AUTH_NOT_VALID);
2607         case_WLAN(DEAUTH_LEAVING);
2608         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2609         case_WLAN(DISASSOC_AP_BUSY);
2610         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2611         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2612         case_WLAN(DISASSOC_STA_HAS_LEFT);
2613         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2614         case_WLAN(DISASSOC_BAD_POWER);
2615         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2616         case_WLAN(INVALID_IE);
2617         case_WLAN(MIC_FAILURE);
2618         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2619         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2620         case_WLAN(IE_DIFFERENT);
2621         case_WLAN(INVALID_GROUP_CIPHER);
2622         case_WLAN(INVALID_PAIRWISE_CIPHER);
2623         case_WLAN(INVALID_AKMP);
2624         case_WLAN(UNSUPP_RSN_VERSION);
2625         case_WLAN(INVALID_RSN_IE_CAP);
2626         case_WLAN(IEEE8021X_FAILED);
2627         case_WLAN(CIPHER_SUITE_REJECTED);
2628         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2629         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2630         case_WLAN(DISASSOC_LOW_ACK);
2631         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2632         case_WLAN(QSTA_LEAVE_QBSS);
2633         case_WLAN(QSTA_NOT_USE);
2634         case_WLAN(QSTA_REQUIRE_SETUP);
2635         case_WLAN(QSTA_TIMEOUT);
2636         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2637         case_WLAN(MESH_PEER_CANCELED);
2638         case_WLAN(MESH_MAX_PEERS);
2639         case_WLAN(MESH_CONFIG);
2640         case_WLAN(MESH_CLOSE);
2641         case_WLAN(MESH_MAX_RETRIES);
2642         case_WLAN(MESH_CONFIRM_TIMEOUT);
2643         case_WLAN(MESH_INVALID_GTK);
2644         case_WLAN(MESH_INCONSISTENT_PARAM);
2645         case_WLAN(MESH_INVALID_SECURITY);
2646         case_WLAN(MESH_PATH_ERROR);
2647         case_WLAN(MESH_PATH_NOFORWARD);
2648         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2649         case_WLAN(MAC_EXISTS_IN_MBSS);
2650         case_WLAN(MESH_CHAN_REGULATORY);
2651         case_WLAN(MESH_CHAN);
2652         default: return "<unknown>";
2653         }
2654 }
2655
2656 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2657                                      struct ieee80211_mgmt *mgmt, size_t len)
2658 {
2659         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2660         const u8 *bssid = NULL;
2661         u16 reason_code;
2662
2663         sdata_assert_lock(sdata);
2664
2665         if (len < 24 + 2)
2666                 return;
2667
2668         if (!ifmgd->associated ||
2669             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2670                 return;
2671
2672         bssid = ifmgd->associated->bssid;
2673
2674         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2675
2676         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2677                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2678
2679         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2680
2681         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2682 }
2683
2684
2685 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2686                                        struct ieee80211_mgmt *mgmt, size_t len)
2687 {
2688         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2689         u16 reason_code;
2690
2691         sdata_assert_lock(sdata);
2692
2693         if (len < 24 + 2)
2694                 return;
2695
2696         if (!ifmgd->associated ||
2697             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2698                 return;
2699
2700         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2701
2702         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2703                    mgmt->sa, reason_code);
2704
2705         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2706
2707         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2708 }
2709
2710 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2711                                 u8 *supp_rates, unsigned int supp_rates_len,
2712                                 u32 *rates, u32 *basic_rates,
2713                                 bool *have_higher_than_11mbit,
2714                                 int *min_rate, int *min_rate_index,
2715                                 int shift, u32 rate_flags)
2716 {
2717         int i, j;
2718
2719         for (i = 0; i < supp_rates_len; i++) {
2720                 int rate = supp_rates[i] & 0x7f;
2721                 bool is_basic = !!(supp_rates[i] & 0x80);
2722
2723                 if ((rate * 5 * (1 << shift)) > 110)
2724                         *have_higher_than_11mbit = true;
2725
2726                 /*
2727                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2728                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2729                  *
2730                  * Note: Even through the membership selector and the basic
2731                  *       rate flag share the same bit, they are not exactly
2732                  *       the same.
2733                  */
2734                 if (!!(supp_rates[i] & 0x80) &&
2735                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2736                         continue;
2737
2738                 for (j = 0; j < sband->n_bitrates; j++) {
2739                         struct ieee80211_rate *br;
2740                         int brate;
2741
2742                         br = &sband->bitrates[j];
2743                         if ((rate_flags & br->flags) != rate_flags)
2744                                 continue;
2745
2746                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2747                         if (brate == rate) {
2748                                 *rates |= BIT(j);
2749                                 if (is_basic)
2750                                         *basic_rates |= BIT(j);
2751                                 if ((rate * 5) < *min_rate) {
2752                                         *min_rate = rate * 5;
2753                                         *min_rate_index = j;
2754                                 }
2755                                 break;
2756                         }
2757                 }
2758         }
2759 }
2760
2761 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2762                                          bool assoc)
2763 {
2764         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2765
2766         sdata_assert_lock(sdata);
2767
2768         if (!assoc) {
2769                 /*
2770                  * we are not associated yet, the only timer that could be
2771                  * running is the timeout for the association response which
2772                  * which is not relevant anymore.
2773                  */
2774                 del_timer_sync(&sdata->u.mgd.timer);
2775                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2776
2777                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2778                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2779                 sdata->u.mgd.flags = 0;
2780                 mutex_lock(&sdata->local->mtx);
2781                 ieee80211_vif_release_channel(sdata);
2782                 mutex_unlock(&sdata->local->mtx);
2783         }
2784
2785         kfree(assoc_data);
2786         sdata->u.mgd.assoc_data = NULL;
2787 }
2788
2789 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2790                                     struct cfg80211_bss *cbss,
2791                                     struct ieee80211_mgmt *mgmt, size_t len)
2792 {
2793         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2794         struct ieee80211_local *local = sdata->local;
2795         struct ieee80211_supported_band *sband;
2796         struct sta_info *sta;
2797         u8 *pos;
2798         u16 capab_info, aid;
2799         struct ieee802_11_elems elems;
2800         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2801         const struct cfg80211_bss_ies *bss_ies = NULL;
2802         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2803         u32 changed = 0;
2804         int err;
2805         bool ret;
2806
2807         /* AssocResp and ReassocResp have identical structure */
2808
2809         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2810         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2811
2812         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2813                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2814                            aid);
2815         aid &= ~(BIT(15) | BIT(14));
2816
2817         ifmgd->broken_ap = false;
2818
2819         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2820                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2821                            aid);
2822                 aid = 0;
2823                 ifmgd->broken_ap = true;
2824         }
2825
2826         pos = mgmt->u.assoc_resp.variable;
2827         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2828
2829         if (!elems.supp_rates) {
2830                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2831                 return false;
2832         }
2833
2834         ifmgd->aid = aid;
2835         ifmgd->tdls_chan_switch_prohibited =
2836                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2837                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2838
2839         /*
2840          * Some APs are erroneously not including some information in their
2841          * (re)association response frames. Try to recover by using the data
2842          * from the beacon or probe response. This seems to afflict mobile
2843          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2844          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2845          */
2846         if ((assoc_data->wmm && !elems.wmm_param) ||
2847             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2848              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2849             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2850              (!elems.vht_cap_elem || !elems.vht_operation))) {
2851                 const struct cfg80211_bss_ies *ies;
2852                 struct ieee802_11_elems bss_elems;
2853
2854                 rcu_read_lock();
2855                 ies = rcu_dereference(cbss->ies);
2856                 if (ies)
2857                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2858                                           GFP_ATOMIC);
2859                 rcu_read_unlock();
2860                 if (!bss_ies)
2861                         return false;
2862
2863                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2864                                        false, &bss_elems);
2865                 if (assoc_data->wmm &&
2866                     !elems.wmm_param && bss_elems.wmm_param) {
2867                         elems.wmm_param = bss_elems.wmm_param;
2868                         sdata_info(sdata,
2869                                    "AP bug: WMM param missing from AssocResp\n");
2870                 }
2871
2872                 /*
2873                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2874                  * have to include the IEs in the (re)association response.
2875                  */
2876                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2877                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2878                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2879                         sdata_info(sdata,
2880                                    "AP bug: HT capability missing from AssocResp\n");
2881                 }
2882                 if (!elems.ht_operation && bss_elems.ht_operation &&
2883                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2884                         elems.ht_operation = bss_elems.ht_operation;
2885                         sdata_info(sdata,
2886                                    "AP bug: HT operation missing from AssocResp\n");
2887                 }
2888                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2889                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2890                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2891                         sdata_info(sdata,
2892                                    "AP bug: VHT capa missing from AssocResp\n");
2893                 }
2894                 if (!elems.vht_operation && bss_elems.vht_operation &&
2895                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2896                         elems.vht_operation = bss_elems.vht_operation;
2897                         sdata_info(sdata,
2898                                    "AP bug: VHT operation missing from AssocResp\n");
2899                 }
2900         }
2901
2902         /*
2903          * We previously checked these in the beacon/probe response, so
2904          * they should be present here. This is just a safety net.
2905          */
2906         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2907             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2908                 sdata_info(sdata,
2909                            "HT AP is missing WMM params or HT capability/operation\n");
2910                 ret = false;
2911                 goto out;
2912         }
2913
2914         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2915             (!elems.vht_cap_elem || !elems.vht_operation)) {
2916                 sdata_info(sdata,
2917                            "VHT AP is missing VHT capability/operation\n");
2918                 ret = false;
2919                 goto out;
2920         }
2921
2922         mutex_lock(&sdata->local->sta_mtx);
2923         /*
2924          * station info was already allocated and inserted before
2925          * the association and should be available to us
2926          */
2927         sta = sta_info_get(sdata, cbss->bssid);
2928         if (WARN_ON(!sta)) {
2929                 mutex_unlock(&sdata->local->sta_mtx);
2930                 ret = false;
2931                 goto out;
2932         }
2933
2934         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2935
2936         /* Set up internal HT/VHT capabilities */
2937         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2938                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2939                                                   elems.ht_cap_elem, sta);
2940
2941         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2942                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2943                                                     elems.vht_cap_elem, sta);
2944
2945         /*
2946          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2947          * in their association response, so ignore that data for our own
2948          * configuration. If it changed since the last beacon, we'll get the
2949          * next beacon and update then.
2950          */
2951
2952         /*
2953          * If an operating mode notification IE is present, override the
2954          * NSS calculation (that would be done in rate_control_rate_init())
2955          * and use the # of streams from that element.
2956          */
2957         if (elems.opmode_notif &&
2958             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2959                 u8 nss;
2960
2961                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2962                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2963                 nss += 1;
2964                 sta->sta.rx_nss = nss;
2965         }
2966
2967         rate_control_rate_init(sta);
2968
2969         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2970                 set_sta_flag(sta, WLAN_STA_MFP);
2971
2972         sta->sta.wme = elems.wmm_param;
2973
2974         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2975         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2976                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2977         if (err) {
2978                 sdata_info(sdata,
2979                            "failed to move station %pM to desired state\n",
2980                            sta->sta.addr);
2981                 WARN_ON(__sta_info_destroy(sta));
2982                 mutex_unlock(&sdata->local->sta_mtx);
2983                 ret = false;
2984                 goto out;
2985         }
2986
2987         mutex_unlock(&sdata->local->sta_mtx);
2988
2989         /*
2990          * Always handle WMM once after association regardless
2991          * of the first value the AP uses. Setting -1 here has
2992          * that effect because the AP values is an unsigned
2993          * 4-bit value.
2994          */
2995         ifmgd->wmm_last_param_set = -1;
2996
2997         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2998                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2999                                          elems.wmm_param_len);
3000         else
3001                 ieee80211_set_wmm_default(sdata, false);
3002         changed |= BSS_CHANGED_QOS;
3003
3004         /* set AID and assoc capability,
3005          * ieee80211_set_associated() will tell the driver */
3006         bss_conf->aid = aid;
3007         bss_conf->assoc_capability = capab_info;
3008         ieee80211_set_associated(sdata, cbss, changed);
3009
3010         /*
3011          * If we're using 4-addr mode, let the AP know that we're
3012          * doing so, so that it can create the STA VLAN on its side
3013          */
3014         if (ifmgd->use_4addr)
3015                 ieee80211_send_4addr_nullfunc(local, sdata);
3016
3017         /*
3018          * Start timer to probe the connection to the AP now.
3019          * Also start the timer that will detect beacon loss.
3020          */
3021         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3022         ieee80211_sta_reset_beacon_monitor(sdata);
3023
3024         ret = true;
3025  out:
3026         kfree(bss_ies);
3027         return ret;
3028 }
3029
3030 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3031                                          struct ieee80211_mgmt *mgmt,
3032                                          size_t len)
3033 {
3034         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3035         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3036         u16 capab_info, status_code, aid;
3037         struct ieee802_11_elems elems;
3038         int ac, uapsd_queues = -1;
3039         u8 *pos;
3040         bool reassoc;
3041         struct cfg80211_bss *bss;
3042
3043         sdata_assert_lock(sdata);
3044
3045         if (!assoc_data)
3046                 return;
3047         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3048                 return;
3049
3050         /*
3051          * AssocResp and ReassocResp have identical structure, so process both
3052          * of them in this function.
3053          */
3054
3055         if (len < 24 + 6)
3056                 return;
3057
3058         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3059         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3060         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3061         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3062
3063         sdata_info(sdata,
3064                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3065                    reassoc ? "Rea" : "A", mgmt->sa,
3066                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3067
3068         pos = mgmt->u.assoc_resp.variable;
3069         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3070
3071         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3072             elems.timeout_int &&
3073             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3074                 u32 tu, ms;
3075                 tu = le32_to_cpu(elems.timeout_int->value);
3076                 ms = tu * 1024 / 1000;
3077                 sdata_info(sdata,
3078                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3079                            mgmt->sa, tu, ms);
3080                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3081                 assoc_data->timeout_started = true;
3082                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3083                         run_again(sdata, assoc_data->timeout);
3084                 return;
3085         }
3086
3087         bss = assoc_data->bss;
3088
3089         if (status_code != WLAN_STATUS_SUCCESS) {
3090                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3091                            mgmt->sa, status_code);
3092                 ieee80211_destroy_assoc_data(sdata, false);
3093         } else {
3094                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3095                         /* oops -- internal error -- send timeout for now */
3096                         ieee80211_destroy_assoc_data(sdata, false);
3097                         cfg80211_assoc_timeout(sdata->dev, bss);
3098                         return;
3099                 }
3100                 sdata_info(sdata, "associated\n");
3101
3102                 /*
3103                  * destroy assoc_data afterwards, as otherwise an idle
3104                  * recalc after assoc_data is NULL but before associated
3105                  * is set can cause the interface to go idle
3106                  */
3107                 ieee80211_destroy_assoc_data(sdata, true);
3108
3109                 /* get uapsd queues configuration */
3110                 uapsd_queues = 0;
3111                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3112                         if (sdata->tx_conf[ac].uapsd)
3113                                 uapsd_queues |= BIT(ac);
3114         }
3115
3116         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3117 }
3118
3119 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3120                                   struct ieee80211_mgmt *mgmt, size_t len,
3121                                   struct ieee80211_rx_status *rx_status,
3122                                   struct ieee802_11_elems *elems)
3123 {
3124         struct ieee80211_local *local = sdata->local;
3125         struct ieee80211_bss *bss;
3126         struct ieee80211_channel *channel;
3127
3128         sdata_assert_lock(sdata);
3129
3130         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3131         if (!channel)
3132                 return;
3133
3134         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3135                                         channel);
3136         if (bss) {
3137                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3138                 ieee80211_rx_bss_put(local, bss);
3139         }
3140 }
3141
3142
3143 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3144                                          struct sk_buff *skb)
3145 {
3146         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3147         struct ieee80211_if_managed *ifmgd;
3148         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3149         size_t baselen, len = skb->len;
3150         struct ieee802_11_elems elems;
3151
3152         ifmgd = &sdata->u.mgd;
3153
3154         sdata_assert_lock(sdata);
3155
3156         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3157                 return; /* ignore ProbeResp to foreign address */
3158
3159         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3160         if (baselen > len)
3161                 return;
3162
3163         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3164                                false, &elems);
3165
3166         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3167
3168         if (ifmgd->associated &&
3169             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3170                 ieee80211_reset_ap_probe(sdata);
3171
3172         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3173             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3174                 /* got probe response, continue with auth */
3175                 sdata_info(sdata, "direct probe responded\n");
3176                 ifmgd->auth_data->tries = 0;
3177                 ifmgd->auth_data->timeout = jiffies;
3178                 ifmgd->auth_data->timeout_started = true;
3179                 run_again(sdata, ifmgd->auth_data->timeout);
3180         }
3181 }
3182
3183 /*
3184  * This is the canonical list of information elements we care about,
3185  * the filter code also gives us all changes to the Microsoft OUI
3186  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3187  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3188  * changes to requested client power.
3189  *
3190  * We implement beacon filtering in software since that means we can
3191  * avoid processing the frame here and in cfg80211, and userspace
3192  * will not be able to tell whether the hardware supports it or not.
3193  *
3194  * XXX: This list needs to be dynamic -- userspace needs to be able to
3195  *      add items it requires. It also needs to be able to tell us to
3196  *      look out for other vendor IEs.
3197  */
3198 static const u64 care_about_ies =
3199         (1ULL << WLAN_EID_COUNTRY) |
3200         (1ULL << WLAN_EID_ERP_INFO) |
3201         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3202         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3203         (1ULL << WLAN_EID_HT_CAPABILITY) |
3204         (1ULL << WLAN_EID_HT_OPERATION);
3205
3206 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3207                                      struct ieee80211_mgmt *mgmt, size_t len,
3208                                      struct ieee80211_rx_status *rx_status)
3209 {
3210         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3211         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3212         size_t baselen;
3213         struct ieee802_11_elems elems;
3214         struct ieee80211_local *local = sdata->local;
3215         struct ieee80211_chanctx_conf *chanctx_conf;
3216         struct ieee80211_channel *chan;
3217         struct sta_info *sta;
3218         u32 changed = 0;
3219         bool erp_valid;
3220         u8 erp_value = 0;
3221         u32 ncrc;
3222         u8 *bssid;
3223         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3224
3225         sdata_assert_lock(sdata);
3226
3227         /* Process beacon from the current BSS */
3228         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3229         if (baselen > len)
3230                 return;
3231
3232         rcu_read_lock();
3233         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3234         if (!chanctx_conf) {
3235                 rcu_read_unlock();
3236                 return;
3237         }
3238
3239         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3240                 rcu_read_unlock();
3241                 return;
3242         }
3243         chan = chanctx_conf->def.chan;
3244         rcu_read_unlock();
3245
3246         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3247             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3248                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3249                                        len - baselen, false, &elems);
3250
3251                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3252                 if (elems.tim && !elems.parse_error) {
3253                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3254                         ifmgd->dtim_period = tim_ie->dtim_period;
3255                 }
3256                 ifmgd->have_beacon = true;
3257                 ifmgd->assoc_data->need_beacon = false;
3258                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3259                         sdata->vif.bss_conf.sync_tsf =
3260                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3261                         sdata->vif.bss_conf.sync_device_ts =
3262                                 rx_status->device_timestamp;
3263                         if (elems.tim)
3264                                 sdata->vif.bss_conf.sync_dtim_count =
3265                                         elems.tim->dtim_count;
3266                         else
3267                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3268                 }
3269                 /* continue assoc process */
3270                 ifmgd->assoc_data->timeout = jiffies;
3271                 ifmgd->assoc_data->timeout_started = true;
3272                 run_again(sdata, ifmgd->assoc_data->timeout);
3273                 return;
3274         }
3275
3276         if (!ifmgd->associated ||
3277             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3278                 return;
3279         bssid = ifmgd->associated->bssid;
3280
3281         /* Track average RSSI from the Beacon frames of the current AP */
3282         ifmgd->last_beacon_signal = rx_status->signal;
3283         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3284                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3285                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3286                 ifmgd->last_cqm_event_signal = 0;
3287                 ifmgd->count_beacon_signal = 1;
3288                 ifmgd->last_ave_beacon_signal = 0;
3289         } else {
3290                 ifmgd->ave_beacon_signal =
3291                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3292                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3293                          ifmgd->ave_beacon_signal) / 16;
3294                 ifmgd->count_beacon_signal++;
3295         }
3296
3297         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3298             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3299                 int sig = ifmgd->ave_beacon_signal;
3300                 int last_sig = ifmgd->last_ave_beacon_signal;
3301
3302                 /*
3303                  * if signal crosses either of the boundaries, invoke callback
3304                  * with appropriate parameters
3305                  */
3306                 if (sig > ifmgd->rssi_max_thold &&
3307                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3308                         ifmgd->last_ave_beacon_signal = sig;
3309                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3310                 } else if (sig < ifmgd->rssi_min_thold &&
3311                            (last_sig >= ifmgd->rssi_max_thold ||
3312                            last_sig == 0)) {
3313                         ifmgd->last_ave_beacon_signal = sig;
3314                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3315                 }
3316         }
3317
3318         if (bss_conf->cqm_rssi_thold &&
3319             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3320             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3321                 int sig = ifmgd->ave_beacon_signal / 16;
3322                 int last_event = ifmgd->last_cqm_event_signal;
3323                 int thold = bss_conf->cqm_rssi_thold;
3324                 int hyst = bss_conf->cqm_rssi_hyst;
3325                 if (sig < thold &&
3326                     (last_event == 0 || sig < last_event - hyst)) {
3327                         ifmgd->last_cqm_event_signal = sig;
3328                         ieee80211_cqm_rssi_notify(
3329                                 &sdata->vif,
3330                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3331                                 GFP_KERNEL);
3332                 } else if (sig > thold &&
3333                            (last_event == 0 || sig > last_event + hyst)) {
3334                         ifmgd->last_cqm_event_signal = sig;
3335                         ieee80211_cqm_rssi_notify(
3336                                 &sdata->vif,
3337                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3338                                 GFP_KERNEL);
3339                 }
3340         }
3341
3342         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3343                 mlme_dbg_ratelimited(sdata,
3344                                      "cancelling AP probe due to a received beacon\n");
3345                 ieee80211_reset_ap_probe(sdata);
3346         }
3347
3348         /*
3349          * Push the beacon loss detection into the future since
3350          * we are processing a beacon from the AP just now.
3351          */
3352         ieee80211_sta_reset_beacon_monitor(sdata);
3353
3354         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3355         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3356                                           len - baselen, false, &elems,
3357                                           care_about_ies, ncrc);
3358
3359         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3360                 bool directed_tim = ieee80211_check_tim(elems.tim,
3361                                                         elems.tim_len,
3362                                                         ifmgd->aid);
3363                 if (directed_tim) {
3364                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3365                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3366                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3367                                         ieee80211_hw_config(local,
3368                                                             IEEE80211_CONF_CHANGE_PS);
3369                                 }
3370                                 ieee80211_send_nullfunc(local, sdata, 0);
3371                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3372                                 local->pspolling = true;
3373
3374                                 /*
3375                                  * Here is assumed that the driver will be
3376                                  * able to send ps-poll frame and receive a
3377                                  * response even though power save mode is
3378                                  * enabled, but some drivers might require
3379                                  * to disable power save here. This needs
3380                                  * to be investigated.
3381                                  */
3382                                 ieee80211_send_pspoll(local, sdata);
3383                         }
3384                 }
3385         }
3386
3387         if (sdata->vif.p2p) {
3388                 struct ieee80211_p2p_noa_attr noa = {};
3389                 int ret;
3390
3391                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3392                                             len - baselen,
3393                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3394                                             (u8 *) &noa, sizeof(noa));
3395                 if (ret >= 2) {
3396                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3397                                 /* valid noa_attr and index changed */
3398                                 sdata->u.mgd.p2p_noa_index = noa.index;
3399                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3400                                 changed |= BSS_CHANGED_P2P_PS;
3401                                 /*
3402                                  * make sure we update all information, the CRC
3403                                  * mechanism doesn't look at P2P attributes.
3404                                  */
3405                                 ifmgd->beacon_crc_valid = false;
3406                         }
3407                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3408                         /* noa_attr not found and we had valid noa_attr before */
3409                         sdata->u.mgd.p2p_noa_index = -1;
3410                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3411                         changed |= BSS_CHANGED_P2P_PS;
3412                         ifmgd->beacon_crc_valid = false;
3413                 }
3414         }
3415
3416         if (ifmgd->csa_waiting_bcn)
3417                 ieee80211_chswitch_post_beacon(sdata);
3418
3419         /*
3420          * Update beacon timing and dtim count on every beacon appearance. This
3421          * will allow the driver to use the most updated values. Do it before
3422          * comparing this one with last received beacon.
3423          * IMPORTANT: These parameters would possibly be out of sync by the time
3424          * the driver will use them. The synchronized view is currently
3425          * guaranteed only in certain callbacks.
3426          */
3427         if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3428                 sdata->vif.bss_conf.sync_tsf =
3429                         le64_to_cpu(mgmt->u.beacon.timestamp);
3430                 sdata->vif.bss_conf.sync_device_ts =
3431                         rx_status->device_timestamp;
3432                 if (elems.tim)
3433                         sdata->vif.bss_conf.sync_dtim_count =
3434                                 elems.tim->dtim_count;
3435                 else
3436                         sdata->vif.bss_conf.sync_dtim_count = 0;
3437         }
3438
3439         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3440                 return;
3441         ifmgd->beacon_crc = ncrc;
3442         ifmgd->beacon_crc_valid = true;
3443
3444         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3445
3446         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3447                                          rx_status->device_timestamp,
3448                                          &elems, true);
3449
3450         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3451             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3452                                      elems.wmm_param_len))
3453                 changed |= BSS_CHANGED_QOS;
3454
3455         /*
3456          * If we haven't had a beacon before, tell the driver about the
3457          * DTIM period (and beacon timing if desired) now.
3458          */
3459         if (!ifmgd->have_beacon) {
3460                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3461                 if (elems.tim)
3462                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3463                 else
3464                         bss_conf->dtim_period = 1;
3465
3466                 changed |= BSS_CHANGED_BEACON_INFO;
3467                 ifmgd->have_beacon = true;
3468
3469                 mutex_lock(&local->iflist_mtx);
3470                 ieee80211_recalc_ps(local, -1);
3471                 mutex_unlock(&local->iflist_mtx);
3472
3473                 ieee80211_recalc_ps_vif(sdata);
3474         }
3475
3476         if (elems.erp_info) {
3477                 erp_valid = true;
3478                 erp_value = elems.erp_info[0];
3479         } else {
3480                 erp_valid = false;
3481         }
3482         changed |= ieee80211_handle_bss_capability(sdata,
3483                         le16_to_cpu(mgmt->u.beacon.capab_info),
3484                         erp_valid, erp_value);
3485
3486         mutex_lock(&local->sta_mtx);
3487         sta = sta_info_get(sdata, bssid);
3488
3489         if (ieee80211_config_bw(sdata, sta,
3490                                 elems.ht_cap_elem, elems.ht_operation,
3491                                 elems.vht_operation, bssid, &changed)) {
3492                 mutex_unlock(&local->sta_mtx);
3493                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3494                                        WLAN_REASON_DEAUTH_LEAVING,
3495                                        true, deauth_buf);
3496                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3497                                       sizeof(deauth_buf));
3498                 return;
3499         }
3500
3501         if (sta && elems.opmode_notif)
3502                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3503                                             rx_status->band, true);
3504         mutex_unlock(&local->sta_mtx);
3505
3506         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3507                                                elems.country_elem,
3508                                                elems.country_elem_len,
3509                                                elems.pwr_constr_elem,
3510                                                elems.cisco_dtpc_elem);
3511
3512         ieee80211_bss_info_change_notify(sdata, changed);
3513 }
3514
3515 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3516                                   struct sk_buff *skb)
3517 {
3518         struct ieee80211_rx_status *rx_status;
3519         struct ieee80211_mgmt *mgmt;
3520         u16 fc;
3521         struct ieee802_11_elems elems;
3522         int ies_len;
3523
3524         rx_status = (struct ieee80211_rx_status *) skb->cb;
3525         mgmt = (struct ieee80211_mgmt *) skb->data;
3526         fc = le16_to_cpu(mgmt->frame_control);
3527
3528         sdata_lock(sdata);
3529
3530         switch (fc & IEEE80211_FCTL_STYPE) {
3531         case IEEE80211_STYPE_BEACON:
3532                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3533                 break;
3534         case IEEE80211_STYPE_PROBE_RESP:
3535                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3536                 break;
3537         case IEEE80211_STYPE_AUTH:
3538                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3539                 break;
3540         case IEEE80211_STYPE_DEAUTH:
3541                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3542                 break;
3543         case IEEE80211_STYPE_DISASSOC:
3544                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3545                 break;
3546         case IEEE80211_STYPE_ASSOC_RESP:
3547         case IEEE80211_STYPE_REASSOC_RESP:
3548                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3549                 break;
3550         case IEEE80211_STYPE_ACTION:
3551                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3552                         ies_len = skb->len -
3553                                   offsetof(struct ieee80211_mgmt,
3554                                            u.action.u.chan_switch.variable);
3555
3556                         if (ies_len < 0)
3557                                 break;
3558
3559                         ieee802_11_parse_elems(
3560                                 mgmt->u.action.u.chan_switch.variable,
3561                                 ies_len, true, &elems);
3562
3563                         if (elems.parse_error)
3564                                 break;
3565
3566                         ieee80211_sta_process_chanswitch(sdata,
3567                                                  rx_status->mactime,
3568                                                  rx_status->device_timestamp,
3569                                                  &elems, false);
3570                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3571                         ies_len = skb->len -
3572                                   offsetof(struct ieee80211_mgmt,
3573                                            u.action.u.ext_chan_switch.variable);
3574
3575                         if (ies_len < 0)
3576                                 break;
3577
3578                         ieee802_11_parse_elems(
3579                                 mgmt->u.action.u.ext_chan_switch.variable,
3580                                 ies_len, true, &elems);
3581
3582                         if (elems.parse_error)
3583                                 break;
3584
3585                         /* for the handling code pretend this was also an IE */
3586                         elems.ext_chansw_ie =
3587                                 &mgmt->u.action.u.ext_chan_switch.data;
3588
3589                         ieee80211_sta_process_chanswitch(sdata,
3590                                                  rx_status->mactime,
3591                                                  rx_status->device_timestamp,
3592                                                  &elems, false);
3593                 }
3594                 break;
3595         }
3596         sdata_unlock(sdata);
3597 }
3598
3599 static void ieee80211_sta_timer(unsigned long data)
3600 {
3601         struct ieee80211_sub_if_data *sdata =
3602                 (struct ieee80211_sub_if_data *) data;
3603
3604         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3605 }
3606
3607 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3608                                           u8 *bssid, u8 reason, bool tx)
3609 {
3610         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3611
3612         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3613                                tx, frame_buf);
3614
3615         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3616                               IEEE80211_DEAUTH_FRAME_LEN);
3617 }
3618
3619 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3620 {
3621         struct ieee80211_local *local = sdata->local;
3622         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3623         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3624         u32 tx_flags = 0;
3625
3626         sdata_assert_lock(sdata);
3627
3628         if (WARN_ON_ONCE(!auth_data))
3629                 return -EINVAL;
3630
3631         auth_data->tries++;
3632
3633         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3634                 sdata_info(sdata, "authentication with %pM timed out\n",
3635                            auth_data->bss->bssid);
3636
3637                 /*
3638                  * Most likely AP is not in the range so remove the
3639                  * bss struct for that AP.
3640                  */
3641                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3642
3643                 return -ETIMEDOUT;
3644         }
3645
3646         drv_mgd_prepare_tx(local, sdata);
3647
3648         if (auth_data->bss->proberesp_ies) {
3649                 u16 trans = 1;
3650                 u16 status = 0;
3651
3652                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3653                            auth_data->bss->bssid, auth_data->tries,
3654                            IEEE80211_AUTH_MAX_TRIES);
3655
3656                 auth_data->expected_transaction = 2;
3657
3658                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3659                         trans = auth_data->sae_trans;
3660                         status = auth_data->sae_status;
3661                         auth_data->expected_transaction = trans;
3662                 }
3663
3664                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3665                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3666                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3667
3668                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3669                                     auth_data->data, auth_data->data_len,
3670                                     auth_data->bss->bssid,
3671                                     auth_data->bss->bssid, NULL, 0, 0,
3672                                     tx_flags);
3673         } else {
3674                 const u8 *ssidie;
3675
3676                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3677                            auth_data->bss->bssid, auth_data->tries,
3678                            IEEE80211_AUTH_MAX_TRIES);
3679
3680                 rcu_read_lock();
3681                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3682                 if (!ssidie) {
3683                         rcu_read_unlock();
3684                         return -EINVAL;
3685                 }
3686                 /*
3687                  * Direct probe is sent to broadcast address as some APs
3688                  * will not answer to direct packet in unassociated state.
3689                  */
3690                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
3691                                          ssidie + 2, ssidie[1],
3692                                          NULL, 0, (u32) -1, true, 0,
3693                                          auth_data->bss->channel, false);
3694                 rcu_read_unlock();
3695         }
3696
3697         if (tx_flags == 0) {
3698                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3699                 auth_data->timeout_started = true;
3700                 run_again(sdata, auth_data->timeout);
3701         } else {
3702                 auth_data->timeout =
3703                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3704                 auth_data->timeout_started = true;
3705                 run_again(sdata, auth_data->timeout);
3706         }
3707
3708         return 0;
3709 }
3710
3711 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3712 {
3713         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3714         struct ieee80211_local *local = sdata->local;
3715
3716         sdata_assert_lock(sdata);
3717
3718         assoc_data->tries++;
3719         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3720                 sdata_info(sdata, "association with %pM timed out\n",
3721                            assoc_data->bss->bssid);
3722
3723                 /*
3724                  * Most likely AP is not in the range so remove the
3725                  * bss struct for that AP.
3726                  */
3727                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3728
3729                 return -ETIMEDOUT;
3730         }
3731
3732         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3733                    assoc_data->bss->bssid, assoc_data->tries,
3734                    IEEE80211_ASSOC_MAX_TRIES);
3735         ieee80211_send_assoc(sdata);
3736
3737         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3738                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3739                 assoc_data->timeout_started = true;
3740                 run_again(sdata, assoc_data->timeout);
3741         } else {
3742                 assoc_data->timeout =
3743                         round_jiffies_up(jiffies +
3744                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3745                 assoc_data->timeout_started = true;
3746                 run_again(sdata, assoc_data->timeout);
3747         }
3748
3749         return 0;
3750 }
3751
3752 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3753                                   __le16 fc, bool acked)
3754 {
3755         struct ieee80211_local *local = sdata->local;
3756
3757         sdata->u.mgd.status_fc = fc;
3758         sdata->u.mgd.status_acked = acked;
3759         sdata->u.mgd.status_received = true;
3760
3761         ieee80211_queue_work(&local->hw, &sdata->work);
3762 }
3763
3764 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3765 {
3766         struct ieee80211_local *local = sdata->local;
3767         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3768
3769         sdata_lock(sdata);
3770
3771         if (ifmgd->status_received) {
3772                 __le16 fc = ifmgd->status_fc;
3773                 bool status_acked = ifmgd->status_acked;
3774
3775                 ifmgd->status_received = false;
3776                 if (ifmgd->auth_data &&
3777                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3778                         if (status_acked) {
3779                                 ifmgd->auth_data->timeout =
3780                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3781                                 run_again(sdata, ifmgd->auth_data->timeout);
3782                         } else {
3783                                 ifmgd->auth_data->timeout = jiffies - 1;
3784                         }
3785                         ifmgd->auth_data->timeout_started = true;
3786                 } else if (ifmgd->assoc_data &&
3787                            (ieee80211_is_assoc_req(fc) ||
3788                             ieee80211_is_reassoc_req(fc))) {
3789                         if (status_acked) {
3790                                 ifmgd->assoc_data->timeout =
3791                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3792                                 run_again(sdata, ifmgd->assoc_data->timeout);
3793                         } else {
3794                                 ifmgd->assoc_data->timeout = jiffies - 1;
3795                         }
3796                         ifmgd->assoc_data->timeout_started = true;
3797                 }
3798         }
3799
3800         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3801             time_after(jiffies, ifmgd->auth_data->timeout)) {
3802                 if (ifmgd->auth_data->done) {
3803                         /*
3804                          * ok ... we waited for assoc but userspace didn't,
3805                          * so let's just kill the auth data
3806                          */
3807                         ieee80211_destroy_auth_data(sdata, false);
3808                 } else if (ieee80211_probe_auth(sdata)) {
3809                         u8 bssid[ETH_ALEN];
3810
3811                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3812
3813                         ieee80211_destroy_auth_data(sdata, false);
3814
3815                         cfg80211_auth_timeout(sdata->dev, bssid);
3816                 }
3817         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3818                 run_again(sdata, ifmgd->auth_data->timeout);
3819
3820         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3821             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3822                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3823                     ieee80211_do_assoc(sdata)) {
3824                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3825
3826                         ieee80211_destroy_assoc_data(sdata, false);
3827                         cfg80211_assoc_timeout(sdata->dev, bss);
3828                 }
3829         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3830                 run_again(sdata, ifmgd->assoc_data->timeout);
3831
3832         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3833             ifmgd->associated) {
3834                 u8 bssid[ETH_ALEN];
3835                 int max_tries;
3836
3837                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3838
3839                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3840                         max_tries = max_nullfunc_tries;
3841                 else
3842                         max_tries = max_probe_tries;
3843
3844                 /* ACK received for nullfunc probing frame */
3845                 if (!ifmgd->probe_send_count)
3846                         ieee80211_reset_ap_probe(sdata);
3847                 else if (ifmgd->nullfunc_failed) {
3848                         if (ifmgd->probe_send_count < max_tries) {
3849                                 mlme_dbg(sdata,
3850                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3851                                          bssid, ifmgd->probe_send_count,
3852                                          max_tries);
3853                                 ieee80211_mgd_probe_ap_send(sdata);
3854                         } else {
3855                                 mlme_dbg(sdata,
3856                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3857                                          bssid);
3858                                 ieee80211_sta_connection_lost(sdata, bssid,
3859                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3860                                         false);
3861                         }
3862                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3863                         run_again(sdata, ifmgd->probe_timeout);
3864                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3865                         mlme_dbg(sdata,
3866                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3867                                  bssid, probe_wait_ms);
3868                         ieee80211_sta_connection_lost(sdata, bssid,
3869                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3870                 } else if (ifmgd->probe_send_count < max_tries) {
3871                         mlme_dbg(sdata,
3872                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3873                                  bssid, probe_wait_ms,
3874                                  ifmgd->probe_send_count, max_tries);
3875                         ieee80211_mgd_probe_ap_send(sdata);
3876                 } else {
3877                         /*
3878                          * We actually lost the connection ... or did we?
3879                          * Let's make sure!
3880                          */
3881                         wiphy_debug(local->hw.wiphy,
3882                                     "%s: No probe response from AP %pM"
3883                                     " after %dms, disconnecting.\n",
3884                                     sdata->name,
3885                                     bssid, probe_wait_ms);
3886
3887                         ieee80211_sta_connection_lost(sdata, bssid,
3888                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3889                 }
3890         }
3891
3892         sdata_unlock(sdata);
3893 }
3894
3895 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3896 {
3897         struct ieee80211_sub_if_data *sdata =
3898                 (struct ieee80211_sub_if_data *) data;
3899         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3900
3901         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3902                 return;
3903
3904         sdata->u.mgd.connection_loss = false;
3905         ieee80211_queue_work(&sdata->local->hw,
3906                              &sdata->u.mgd.beacon_connection_loss_work);
3907 }
3908
3909 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3910 {
3911         struct ieee80211_sub_if_data *sdata =
3912                 (struct ieee80211_sub_if_data *) data;
3913         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3914         struct ieee80211_local *local = sdata->local;
3915
3916         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3917                 return;
3918
3919         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3920 }
3921
3922 static void ieee80211_sta_monitor_work(struct work_struct *work)
3923 {
3924         struct ieee80211_sub_if_data *sdata =
3925                 container_of(work, struct ieee80211_sub_if_data,
3926                              u.mgd.monitor_work);
3927
3928         ieee80211_mgd_probe_ap(sdata, false);
3929 }
3930
3931 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3932 {
3933         u32 flags;
3934
3935         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3936                 __ieee80211_stop_poll(sdata);
3937
3938                 /* let's probe the connection once */
3939                 flags = sdata->local->hw.flags;
3940                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3941                         ieee80211_queue_work(&sdata->local->hw,
3942                                              &sdata->u.mgd.monitor_work);
3943                 /* and do all the other regular work too */
3944                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3945         }
3946 }
3947
3948 #ifdef CONFIG_PM
3949 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3950 {
3951         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3952         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3953
3954         sdata_lock(sdata);
3955
3956         if (ifmgd->auth_data || ifmgd->assoc_data) {
3957                 const u8 *bssid = ifmgd->auth_data ?
3958                                 ifmgd->auth_data->bss->bssid :
3959                                 ifmgd->assoc_data->bss->bssid;
3960
3961                 /*
3962                  * If we are trying to authenticate / associate while suspending,
3963                  * cfg80211 won't know and won't actually abort those attempts,
3964                  * thus we need to do that ourselves.
3965                  */
3966                 ieee80211_send_deauth_disassoc(sdata, bssid,
3967                                                IEEE80211_STYPE_DEAUTH,
3968                                                WLAN_REASON_DEAUTH_LEAVING,
3969                                                false, frame_buf);
3970                 if (ifmgd->assoc_data)
3971                         ieee80211_destroy_assoc_data(sdata, false);
3972                 if (ifmgd->auth_data)
3973                         ieee80211_destroy_auth_data(sdata, false);
3974                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3975                                       IEEE80211_DEAUTH_FRAME_LEN);
3976         }
3977
3978         /* This is a bit of a hack - we should find a better and more generic
3979          * solution to this. Normally when suspending, cfg80211 will in fact
3980          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
3981          * auth (not so important) or assoc (this is the problem) process.
3982          *
3983          * As a consequence, it can happen that we are in the process of both
3984          * associating and suspending, and receive an association response
3985          * after cfg80211 has checked if it needs to disconnect, but before
3986          * we actually set the flag to drop incoming frames. This will then
3987          * cause the workqueue flush to process the association response in
3988          * the suspend, resulting in a successful association just before it
3989          * tries to remove the interface from the driver, which now though
3990          * has a channel context assigned ... this results in issues.
3991          *
3992          * To work around this (for now) simply deauth here again if we're
3993          * now connected.
3994          */
3995         if (ifmgd->associated && !sdata->local->wowlan) {
3996                 u8 bssid[ETH_ALEN];
3997                 struct cfg80211_deauth_request req = {
3998                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
3999                         .bssid = bssid,
4000                 };
4001
4002                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4003                 ieee80211_mgd_deauth(sdata, &req);
4004         }
4005
4006         sdata_unlock(sdata);
4007 }
4008
4009 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4010 {
4011         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4012
4013         sdata_lock(sdata);
4014         if (!ifmgd->associated) {
4015                 sdata_unlock(sdata);
4016                 return;
4017         }
4018
4019         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4020                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4021                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4022                 ieee80211_sta_connection_lost(sdata,
4023                                               ifmgd->associated->bssid,
4024                                               WLAN_REASON_UNSPECIFIED,
4025                                               true);
4026                 sdata_unlock(sdata);
4027                 return;
4028         }
4029         sdata_unlock(sdata);
4030 }
4031 #endif
4032
4033 /* interface setup */
4034 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4035 {
4036         struct ieee80211_if_managed *ifmgd;
4037
4038         ifmgd = &sdata->u.mgd;
4039         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4040         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4041         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4042                   ieee80211_beacon_connection_loss_work);
4043         INIT_WORK(&ifmgd->csa_connection_drop_work,
4044                   ieee80211_csa_connection_drop_work);
4045         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4046         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4047                           ieee80211_tdls_peer_del_work);
4048         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4049                     (unsigned long) sdata);
4050         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4051                     (unsigned long) sdata);
4052         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4053                     (unsigned long) sdata);
4054         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4055                     (unsigned long) sdata);
4056         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4057                           ieee80211_sta_handle_tspec_ac_params_wk);
4058
4059         ifmgd->flags = 0;
4060         ifmgd->powersave = sdata->wdev.ps;
4061         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4062         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4063         ifmgd->p2p_noa_index = -1;
4064
4065         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4066                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4067         else
4068                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4069
4070         /* Setup TDLS data */
4071         spin_lock_init(&ifmgd->teardown_lock);
4072         ifmgd->teardown_skb = NULL;
4073         ifmgd->orig_teardown_skb = NULL;
4074 }
4075
4076 /* scan finished notification */
4077 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4078 {
4079         struct ieee80211_sub_if_data *sdata;
4080
4081         /* Restart STA timers */
4082         rcu_read_lock();
4083         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4084                 if (ieee80211_sdata_running(sdata))
4085                         ieee80211_restart_sta_timer(sdata);
4086         }
4087         rcu_read_unlock();
4088 }
4089
4090 int ieee80211_max_network_latency(struct notifier_block *nb,
4091                                   unsigned long data, void *dummy)
4092 {
4093         s32 latency_usec = (s32) data;
4094         struct ieee80211_local *local =
4095                 container_of(nb, struct ieee80211_local,
4096                              network_latency_notifier);
4097
4098         mutex_lock(&local->iflist_mtx);
4099         ieee80211_recalc_ps(local, latency_usec);
4100         mutex_unlock(&local->iflist_mtx);
4101
4102         return NOTIFY_OK;
4103 }
4104
4105 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4106                                      struct cfg80211_bss *cbss)
4107 {
4108         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4109         const u8 *ht_cap_ie, *vht_cap_ie;
4110         const struct ieee80211_ht_cap *ht_cap;
4111         const struct ieee80211_vht_cap *vht_cap;
4112         u8 chains = 1;
4113
4114         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4115                 return chains;
4116
4117         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4118         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4119                 ht_cap = (void *)(ht_cap_ie + 2);
4120                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4121                 /*
4122                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4123                  *       "Tx Unequal Modulation Supported" fields.
4124                  */
4125         }
4126
4127         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4128                 return chains;
4129
4130         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4131         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4132                 u8 nss;
4133                 u16 tx_mcs_map;
4134
4135                 vht_cap = (void *)(vht_cap_ie + 2);
4136                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4137                 for (nss = 8; nss > 0; nss--) {
4138                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4139                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4140                                 break;
4141                 }
4142                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4143                 chains = max(chains, nss);
4144         }
4145
4146         return chains;
4147 }
4148
4149 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4150                                   struct cfg80211_bss *cbss)
4151 {
4152         struct ieee80211_local *local = sdata->local;
4153         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4154         const struct ieee80211_ht_cap *ht_cap = NULL;
4155         const struct ieee80211_ht_operation *ht_oper = NULL;
4156         const struct ieee80211_vht_operation *vht_oper = NULL;
4157         struct ieee80211_supported_band *sband;
4158         struct cfg80211_chan_def chandef;
4159         int ret;
4160
4161         sband = local->hw.wiphy->bands[cbss->channel->band];
4162
4163         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4164                           IEEE80211_STA_DISABLE_80P80MHZ |
4165                           IEEE80211_STA_DISABLE_160MHZ);
4166
4167         rcu_read_lock();
4168
4169         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4170             sband->ht_cap.ht_supported) {
4171                 const u8 *ht_oper_ie, *ht_cap_ie;
4172
4173                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4174                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4175                         ht_oper = (void *)(ht_oper_ie + 2);
4176
4177                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4178                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4179                         ht_cap = (void *)(ht_cap_ie + 2);
4180
4181                 if (!ht_cap) {
4182                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4183                         ht_oper = NULL;
4184                 }
4185         }
4186
4187         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4188             sband->vht_cap.vht_supported) {
4189                 const u8 *vht_oper_ie, *vht_cap;
4190
4191                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4192                                                    WLAN_EID_VHT_OPERATION);
4193                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4194                         vht_oper = (void *)(vht_oper_ie + 2);
4195                 if (vht_oper && !ht_oper) {
4196                         vht_oper = NULL;
4197                         sdata_info(sdata,
4198                                    "AP advertised VHT without HT, disabling both\n");
4199                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4200                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4201                 }
4202
4203                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4204                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4205                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4206                         vht_oper = NULL;
4207                 }
4208         }
4209
4210         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4211                                                      cbss->channel,
4212                                                      ht_cap, ht_oper, vht_oper,
4213                                                      &chandef, false);
4214
4215         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4216                                       local->rx_chains);
4217
4218         rcu_read_unlock();
4219
4220         /* will change later if needed */
4221         sdata->smps_mode = IEEE80211_SMPS_OFF;
4222
4223         mutex_lock(&local->mtx);
4224         /*
4225          * If this fails (possibly due to channel context sharing
4226          * on incompatible channels, e.g. 80+80 and 160 sharing the
4227          * same control channel) try to use a smaller bandwidth.
4228          */
4229         ret = ieee80211_vif_use_channel(sdata, &chandef,
4230                                         IEEE80211_CHANCTX_SHARED);
4231
4232         /* don't downgrade for 5 and 10 MHz channels, though. */
4233         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4234             chandef.width == NL80211_CHAN_WIDTH_10)
4235                 goto out;
4236
4237         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4238                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4239                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4240                                                 IEEE80211_CHANCTX_SHARED);
4241         }
4242  out:
4243         mutex_unlock(&local->mtx);
4244         return ret;
4245 }
4246
4247 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4248                                      struct cfg80211_bss *cbss, bool assoc)
4249 {
4250         struct ieee80211_local *local = sdata->local;
4251         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4252         struct ieee80211_bss *bss = (void *)cbss->priv;
4253         struct sta_info *new_sta = NULL;
4254         struct ieee80211_supported_band *sband;
4255         struct ieee80211_sta_ht_cap sta_ht_cap;
4256         bool have_sta = false, is_override = false;
4257         int err;
4258
4259         sband = local->hw.wiphy->bands[cbss->channel->band];
4260
4261         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4262                 return -EINVAL;
4263
4264         if (assoc) {
4265                 rcu_read_lock();
4266                 have_sta = sta_info_get(sdata, cbss->bssid);
4267                 rcu_read_unlock();
4268         }
4269
4270         if (!have_sta) {
4271                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4272                 if (!new_sta)
4273                         return -ENOMEM;
4274         }
4275
4276         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4277         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4278
4279         is_override = (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) !=
4280                       (sband->ht_cap.cap &
4281                        IEEE80211_HT_CAP_SUP_WIDTH_20_40);
4282
4283         if (new_sta || is_override) {
4284                 err = ieee80211_prep_channel(sdata, cbss);
4285                 if (err) {
4286                         if (new_sta)
4287                                 sta_info_free(local, new_sta);
4288                         return -EINVAL;
4289                 }
4290         }
4291
4292         if (new_sta) {
4293                 u32 rates = 0, basic_rates = 0;
4294                 bool have_higher_than_11mbit;
4295                 int min_rate = INT_MAX, min_rate_index = -1;
4296                 struct ieee80211_chanctx_conf *chanctx_conf;
4297                 const struct cfg80211_bss_ies *ies;
4298                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4299                 u32 rate_flags;
4300
4301                 rcu_read_lock();
4302                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4303                 if (WARN_ON(!chanctx_conf)) {
4304                         rcu_read_unlock();
4305                         sta_info_free(local, new_sta);
4306                         return -EINVAL;
4307                 }
4308                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4309                 rcu_read_unlock();
4310
4311                 ieee80211_get_rates(sband, bss->supp_rates,
4312                                     bss->supp_rates_len,
4313                                     &rates, &basic_rates,
4314                                     &have_higher_than_11mbit,
4315                                     &min_rate, &min_rate_index,
4316                                     shift, rate_flags);
4317
4318                 /*
4319                  * This used to be a workaround for basic rates missing
4320                  * in the association response frame. Now that we no
4321                  * longer use the basic rates from there, it probably
4322                  * doesn't happen any more, but keep the workaround so
4323                  * in case some *other* APs are buggy in different ways
4324                  * we can connect -- with a warning.
4325                  */
4326                 if (!basic_rates && min_rate_index >= 0) {
4327                         sdata_info(sdata,
4328                                    "No basic rates, using min rate instead\n");
4329                         basic_rates = BIT(min_rate_index);
4330                 }
4331
4332                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4333                 sdata->vif.bss_conf.basic_rates = basic_rates;
4334
4335                 /* cf. IEEE 802.11 9.2.12 */
4336                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4337                     have_higher_than_11mbit)
4338                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4339                 else
4340                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4341
4342                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4343
4344                 /* set timing information */
4345                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4346                 rcu_read_lock();
4347                 ies = rcu_dereference(cbss->beacon_ies);
4348                 if (ies) {
4349                         const u8 *tim_ie;
4350
4351                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4352                         sdata->vif.bss_conf.sync_device_ts =
4353                                 bss->device_ts_beacon;
4354                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4355                                                   ies->data, ies->len);
4356                         if (tim_ie && tim_ie[1] >= 2)
4357                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4358                         else
4359                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4360                 } else if (!(local->hw.flags &
4361                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4362                         ies = rcu_dereference(cbss->proberesp_ies);
4363                         /* must be non-NULL since beacon IEs were NULL */
4364                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4365                         sdata->vif.bss_conf.sync_device_ts =
4366                                 bss->device_ts_presp;
4367                         sdata->vif.bss_conf.sync_dtim_count = 0;
4368                 } else {
4369                         sdata->vif.bss_conf.sync_tsf = 0;
4370                         sdata->vif.bss_conf.sync_device_ts = 0;
4371                         sdata->vif.bss_conf.sync_dtim_count = 0;
4372                 }
4373                 rcu_read_unlock();
4374
4375                 /* tell driver about BSSID, basic rates and timing */
4376                 ieee80211_bss_info_change_notify(sdata,
4377                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4378                         BSS_CHANGED_BEACON_INT);
4379
4380                 if (assoc)
4381                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4382
4383                 err = sta_info_insert(new_sta);
4384                 new_sta = NULL;
4385                 if (err) {
4386                         sdata_info(sdata,
4387                                    "failed to insert STA entry for the AP (error %d)\n",
4388                                    err);
4389                         return err;
4390                 }
4391         } else
4392                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4393
4394         return 0;
4395 }
4396
4397 /* config hooks */
4398 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4399                        struct cfg80211_auth_request *req)
4400 {
4401         struct ieee80211_local *local = sdata->local;
4402         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4403         struct ieee80211_mgd_auth_data *auth_data;
4404         u16 auth_alg;
4405         int err;
4406
4407         /* prepare auth data structure */
4408
4409         switch (req->auth_type) {
4410         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4411                 auth_alg = WLAN_AUTH_OPEN;
4412                 break;
4413         case NL80211_AUTHTYPE_SHARED_KEY:
4414                 if (IS_ERR(local->wep_tx_tfm))
4415                         return -EOPNOTSUPP;
4416                 auth_alg = WLAN_AUTH_SHARED_KEY;
4417                 break;
4418         case NL80211_AUTHTYPE_FT:
4419                 auth_alg = WLAN_AUTH_FT;
4420                 break;
4421         case NL80211_AUTHTYPE_NETWORK_EAP:
4422                 auth_alg = WLAN_AUTH_LEAP;
4423                 break;
4424         case NL80211_AUTHTYPE_SAE:
4425                 auth_alg = WLAN_AUTH_SAE;
4426                 break;
4427         default:
4428                 return -EOPNOTSUPP;
4429         }
4430
4431         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4432                             req->ie_len, GFP_KERNEL);
4433         if (!auth_data)
4434                 return -ENOMEM;
4435
4436         auth_data->bss = req->bss;
4437
4438         if (req->sae_data_len >= 4) {
4439                 __le16 *pos = (__le16 *) req->sae_data;
4440                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4441                 auth_data->sae_status = le16_to_cpu(pos[1]);
4442                 memcpy(auth_data->data, req->sae_data + 4,
4443                        req->sae_data_len - 4);
4444                 auth_data->data_len += req->sae_data_len - 4;
4445         }
4446
4447         if (req->ie && req->ie_len) {
4448                 memcpy(&auth_data->data[auth_data->data_len],
4449                        req->ie, req->ie_len);
4450                 auth_data->data_len += req->ie_len;
4451         }
4452
4453         if (req->key && req->key_len) {
4454                 auth_data->key_len = req->key_len;
4455                 auth_data->key_idx = req->key_idx;
4456                 memcpy(auth_data->key, req->key, req->key_len);
4457         }
4458
4459         auth_data->algorithm = auth_alg;
4460
4461         /* try to authenticate/probe */
4462
4463         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4464             ifmgd->assoc_data) {
4465                 err = -EBUSY;
4466                 goto err_free;
4467         }
4468
4469         if (ifmgd->auth_data)
4470                 ieee80211_destroy_auth_data(sdata, false);
4471
4472         /* prep auth_data so we don't go into idle on disassoc */
4473         ifmgd->auth_data = auth_data;
4474
4475         if (ifmgd->associated) {
4476                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4477
4478                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4479                                        WLAN_REASON_UNSPECIFIED,
4480                                        false, frame_buf);
4481
4482                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4483                                       sizeof(frame_buf));
4484         }
4485
4486         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4487
4488         err = ieee80211_prep_connection(sdata, req->bss, false);
4489         if (err)
4490                 goto err_clear;
4491
4492         err = ieee80211_probe_auth(sdata);
4493         if (err) {
4494                 sta_info_destroy_addr(sdata, req->bss->bssid);
4495                 goto err_clear;
4496         }
4497
4498         /* hold our own reference */
4499         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4500         return 0;
4501
4502  err_clear:
4503         memset(ifmgd->bssid, 0, ETH_ALEN);
4504         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4505         ifmgd->auth_data = NULL;
4506  err_free:
4507         kfree(auth_data);
4508         return err;
4509 }
4510
4511 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4512                                         const u8 *wmm_param, int len)
4513 {
4514         const u8 *pos;
4515         size_t left;
4516
4517         if (len < 8)
4518                 return false;
4519
4520         if (wmm_param[5] != 1 /* version */)
4521                 return false;
4522
4523         pos = wmm_param + 8;
4524         left = len - 8;
4525
4526         for (; left >= 4; left -= 4, pos += 4) {
4527                 u8 aifsn = pos[0] & 0x0f;
4528                 u8 ecwmin = pos[1] & 0x0f;
4529                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4530                 int aci = (pos[0] >> 5) & 0x03;
4531
4532                 if (aifsn < 2) {
4533                         sdata_info(sdata,
4534                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4535                                    aifsn, aci);
4536                         return false;
4537                 }
4538                 if (ecwmin > ecwmax) {
4539                         sdata_info(sdata,
4540                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4541                                    ecwmin, ecwmax, aci);
4542                         return false;
4543                 }
4544         }
4545
4546         return true;
4547 }
4548
4549 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4550                         struct cfg80211_assoc_request *req)
4551 {
4552         struct ieee80211_local *local = sdata->local;
4553         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4554         struct ieee80211_bss *bss = (void *)req->bss->priv;
4555         struct ieee80211_mgd_assoc_data *assoc_data;
4556         const struct cfg80211_bss_ies *beacon_ies;
4557         struct ieee80211_supported_band *sband;
4558         const u8 *ssidie, *ht_ie, *vht_ie;
4559         int i, err;
4560
4561         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4562         if (!assoc_data)
4563                 return -ENOMEM;
4564
4565         rcu_read_lock();
4566         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4567         if (!ssidie) {
4568                 rcu_read_unlock();
4569                 kfree(assoc_data);
4570                 return -EINVAL;
4571         }
4572         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4573         assoc_data->ssid_len = ssidie[1];
4574         rcu_read_unlock();
4575
4576         if (ifmgd->associated) {
4577                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4578
4579                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4580                                        WLAN_REASON_UNSPECIFIED,
4581                                        false, frame_buf);
4582
4583                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4584                                       sizeof(frame_buf));
4585         }
4586
4587         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4588                 err = -EBUSY;
4589                 goto err_free;
4590         }
4591
4592         if (ifmgd->assoc_data) {
4593                 err = -EBUSY;
4594                 goto err_free;
4595         }
4596
4597         if (ifmgd->auth_data) {
4598                 bool match;
4599
4600                 /* keep sta info, bssid if matching */
4601                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4602                 ieee80211_destroy_auth_data(sdata, match);
4603         }
4604
4605         /* prepare assoc data */
4606
4607         ifmgd->beacon_crc_valid = false;
4608
4609         assoc_data->wmm = bss->wmm_used &&
4610                           (local->hw.queues >= IEEE80211_NUM_ACS);
4611         if (assoc_data->wmm) {
4612                 /* try to check validity of WMM params IE */
4613                 const struct cfg80211_bss_ies *ies;
4614                 const u8 *wp, *start, *end;
4615
4616                 rcu_read_lock();
4617                 ies = rcu_dereference(req->bss->ies);
4618                 start = ies->data;
4619                 end = start + ies->len;
4620
4621                 while (true) {
4622                         wp = cfg80211_find_vendor_ie(
4623                                 WLAN_OUI_MICROSOFT,
4624                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4625                                 start, end - start);
4626                         if (!wp)
4627                                 break;
4628                         start = wp + wp[1] + 2;
4629                         /* if this IE is too short, try the next */
4630                         if (wp[1] <= 4)
4631                                 continue;
4632                         /* if this IE is WMM params, we found what we wanted */
4633                         if (wp[6] == 1)
4634                                 break;
4635                 }
4636
4637                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4638                                                         wp[1] - 2)) {
4639                         assoc_data->wmm = false;
4640                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4641                 }
4642                 rcu_read_unlock();
4643         }
4644
4645         /*
4646          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4647          * We still associate in non-HT mode (11a/b/g) if any one of these
4648          * ciphers is configured as pairwise.
4649          * We can set this to true for non-11n hardware, that'll be checked
4650          * separately along with the peer capabilities.
4651          */
4652         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4653                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4654                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4655                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4656                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4657                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4658                         netdev_info(sdata->dev,
4659                                     "disabling HT/VHT due to WEP/TKIP use\n");
4660                 }
4661         }
4662
4663         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4664                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4665                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4666         }
4667
4668         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4669                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4670
4671         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4672         sband = local->hw.wiphy->bands[req->bss->channel->band];
4673         if (!sband->ht_cap.ht_supported ||
4674             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4675             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4676                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4677                 if (!bss->wmm_used &&
4678                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4679                         netdev_info(sdata->dev,
4680                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4681         }
4682
4683         /* disable VHT if we don't support it or the AP doesn't use WMM */
4684         if (!sband->vht_cap.vht_supported ||
4685             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4686             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4687                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4688                 if (!bss->wmm_used &&
4689                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4690                         netdev_info(sdata->dev,
4691                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4692         }
4693
4694         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4695         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4696                sizeof(ifmgd->ht_capa_mask));
4697
4698         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4699         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4700                sizeof(ifmgd->vht_capa_mask));
4701
4702         if (req->ie && req->ie_len) {
4703                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4704                 assoc_data->ie_len = req->ie_len;
4705         }
4706
4707         assoc_data->bss = req->bss;
4708
4709         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4710                 if (ifmgd->powersave)
4711                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4712                 else
4713                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4714         } else
4715                 sdata->smps_mode = ifmgd->req_smps;
4716
4717         assoc_data->capability = req->bss->capability;
4718         assoc_data->supp_rates = bss->supp_rates;
4719         assoc_data->supp_rates_len = bss->supp_rates_len;
4720
4721         rcu_read_lock();
4722         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4723         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4724                 assoc_data->ap_ht_param =
4725                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4726         else
4727                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4728         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4729         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4730                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4731                        sizeof(struct ieee80211_vht_cap));
4732         else
4733                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4734         rcu_read_unlock();
4735
4736         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4737                  (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
4738              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4739                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4740
4741         if (bss->wmm_used && bss->uapsd_supported &&
4742             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4743                 assoc_data->uapsd = true;
4744                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4745         } else {
4746                 assoc_data->uapsd = false;
4747                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4748         }
4749
4750         if (req->prev_bssid)
4751                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4752
4753         if (req->use_mfp) {
4754                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4755                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4756         } else {
4757                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4758                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4759         }
4760
4761         if (req->flags & ASSOC_REQ_USE_RRM)
4762                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4763         else
4764                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4765
4766         if (req->crypto.control_port)
4767                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4768         else
4769                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4770
4771         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4772         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4773         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4774                                                         sdata->vif.type);
4775
4776         /* kick off associate process */
4777
4778         ifmgd->assoc_data = assoc_data;
4779         ifmgd->dtim_period = 0;
4780         ifmgd->have_beacon = false;
4781
4782         err = ieee80211_prep_connection(sdata, req->bss, true);
4783         if (err)
4784                 goto err_clear;
4785
4786         rcu_read_lock();
4787         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4788
4789         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4790             !beacon_ies) {
4791                 /*
4792                  * Wait up to one beacon interval ...
4793                  * should this be more if we miss one?
4794                  */
4795                 sdata_info(sdata, "waiting for beacon from %pM\n",
4796                            ifmgd->bssid);
4797                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4798                 assoc_data->timeout_started = true;
4799                 assoc_data->need_beacon = true;
4800         } else if (beacon_ies) {
4801                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4802                                                     beacon_ies->data,
4803                                                     beacon_ies->len);
4804                 u8 dtim_count = 0;
4805
4806                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4807                         const struct ieee80211_tim_ie *tim;
4808                         tim = (void *)(tim_ie + 2);
4809                         ifmgd->dtim_period = tim->dtim_period;
4810                         dtim_count = tim->dtim_count;
4811                 }
4812                 ifmgd->have_beacon = true;
4813                 assoc_data->timeout = jiffies;
4814                 assoc_data->timeout_started = true;
4815
4816                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4817                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4818                         sdata->vif.bss_conf.sync_device_ts =
4819                                 bss->device_ts_beacon;
4820                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4821                 }
4822         } else {
4823                 assoc_data->timeout = jiffies;
4824                 assoc_data->timeout_started = true;
4825         }
4826         rcu_read_unlock();
4827
4828         run_again(sdata, assoc_data->timeout);
4829
4830         if (bss->corrupt_data) {
4831                 char *corrupt_type = "data";
4832                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4833                         if (bss->corrupt_data &
4834                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4835                                 corrupt_type = "beacon and probe response";
4836                         else
4837                                 corrupt_type = "beacon";
4838                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4839                         corrupt_type = "probe response";
4840                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4841                            corrupt_type);
4842         }
4843
4844         return 0;
4845  err_clear:
4846         memset(ifmgd->bssid, 0, ETH_ALEN);
4847         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4848         ifmgd->assoc_data = NULL;
4849  err_free:
4850         kfree(assoc_data);
4851         return err;
4852 }
4853
4854 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4855                          struct cfg80211_deauth_request *req)
4856 {
4857         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4858         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4859         bool tx = !req->local_state_change;
4860
4861         if (ifmgd->auth_data &&
4862             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4863                 sdata_info(sdata,
4864                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4865                            req->bssid, req->reason_code,
4866                            ieee80211_get_reason_code_string(req->reason_code));
4867
4868                 drv_mgd_prepare_tx(sdata->local, sdata);
4869                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4870                                                IEEE80211_STYPE_DEAUTH,
4871                                                req->reason_code, tx,
4872                                                frame_buf);
4873                 ieee80211_destroy_auth_data(sdata, false);
4874                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4875                                       IEEE80211_DEAUTH_FRAME_LEN);
4876
4877                 return 0;
4878         }
4879
4880         if (ifmgd->associated &&
4881             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4882                 sdata_info(sdata,
4883                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4884                            req->bssid, req->reason_code,
4885                            ieee80211_get_reason_code_string(req->reason_code));
4886
4887                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4888                                        req->reason_code, tx, frame_buf);
4889                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4890                                       IEEE80211_DEAUTH_FRAME_LEN);
4891                 return 0;
4892         }
4893
4894         return -ENOTCONN;
4895 }
4896
4897 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4898                            struct cfg80211_disassoc_request *req)
4899 {
4900         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4901         u8 bssid[ETH_ALEN];
4902         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4903
4904         /*
4905          * cfg80211 should catch this ... but it's racy since
4906          * we can receive a disassoc frame, process it, hand it
4907          * to cfg80211 while that's in a locked section already
4908          * trying to tell us that the user wants to disconnect.
4909          */
4910         if (ifmgd->associated != req->bss)
4911                 return -ENOLINK;
4912
4913         sdata_info(sdata,
4914                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4915                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4916
4917         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4918         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4919                                req->reason_code, !req->local_state_change,
4920                                frame_buf);
4921
4922         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4923                               IEEE80211_DEAUTH_FRAME_LEN);
4924
4925         return 0;
4926 }
4927
4928 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4929 {
4930         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4931
4932         /*
4933          * Make sure some work items will not run after this,
4934          * they will not do anything but might not have been
4935          * cancelled when disconnecting.
4936          */
4937         cancel_work_sync(&ifmgd->monitor_work);
4938         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4939         cancel_work_sync(&ifmgd->request_smps_work);
4940         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4941         cancel_work_sync(&ifmgd->chswitch_work);
4942         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4943
4944         sdata_lock(sdata);
4945         if (ifmgd->assoc_data) {
4946                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4947                 ieee80211_destroy_assoc_data(sdata, false);
4948                 cfg80211_assoc_timeout(sdata->dev, bss);
4949         }
4950         if (ifmgd->auth_data)
4951                 ieee80211_destroy_auth_data(sdata, false);
4952         spin_lock_bh(&ifmgd->teardown_lock);
4953         if (ifmgd->teardown_skb) {
4954                 kfree_skb(ifmgd->teardown_skb);
4955                 ifmgd->teardown_skb = NULL;
4956                 ifmgd->orig_teardown_skb = NULL;
4957         }
4958         spin_unlock_bh(&ifmgd->teardown_lock);
4959         del_timer_sync(&ifmgd->timer);
4960         sdata_unlock(sdata);
4961 }
4962
4963 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4964                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4965                                gfp_t gfp)
4966 {
4967         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4968
4969         trace_api_cqm_rssi_notify(sdata, rssi_event);
4970
4971         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4972 }
4973 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
4974
4975 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
4976 {
4977         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4978
4979         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
4980
4981         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
4982 }
4983 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);