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         if (local->quiescing || local->suspended)
1625                 return;
1626
1627         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1628 }
1629
1630 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1631 {
1632         struct delayed_work *delayed_work =
1633                 container_of(work, struct delayed_work, work);
1634         struct ieee80211_sub_if_data *sdata =
1635                 container_of(delayed_work, struct ieee80211_sub_if_data,
1636                              dfs_cac_timer_work);
1637         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1638
1639         mutex_lock(&sdata->local->mtx);
1640         if (sdata->wdev.cac_started) {
1641                 ieee80211_vif_release_channel(sdata);
1642                 cfg80211_cac_event(sdata->dev, &chandef,
1643                                    NL80211_RADAR_CAC_FINISHED,
1644                                    GFP_KERNEL);
1645         }
1646         mutex_unlock(&sdata->local->mtx);
1647 }
1648
1649 static bool
1650 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1651 {
1652         struct ieee80211_local *local = sdata->local;
1653         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1654         bool ret = false;
1655         int ac;
1656
1657         if (local->hw.queues < IEEE80211_NUM_ACS)
1658                 return false;
1659
1660         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1661                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1662                 int non_acm_ac;
1663                 unsigned long now = jiffies;
1664
1665                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1666                     tx_tspec->admitted_time &&
1667                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1668                         tx_tspec->consumed_tx_time = 0;
1669                         tx_tspec->time_slice_start = now;
1670
1671                         if (tx_tspec->downgraded)
1672                                 tx_tspec->action =
1673                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1674                 }
1675
1676                 switch (tx_tspec->action) {
1677                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1678                         /* take the original parameters */
1679                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1680                                 sdata_err(sdata,
1681                                           "failed to set TX queue parameters for queue %d\n",
1682                                           ac);
1683                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1684                         tx_tspec->downgraded = false;
1685                         ret = true;
1686                         break;
1687                 case TX_TSPEC_ACTION_DOWNGRADE:
1688                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1689                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1690                                 ret = true;
1691                                 break;
1692                         }
1693                         /* downgrade next lower non-ACM AC */
1694                         for (non_acm_ac = ac + 1;
1695                              non_acm_ac < IEEE80211_NUM_ACS;
1696                              non_acm_ac++)
1697                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1698                                         break;
1699                         /* The loop will result in using BK even if it requires
1700                          * admission control, such configuration makes no sense
1701                          * and we have to transmit somehow - the AC selection
1702                          * does the same thing.
1703                          */
1704                         if (drv_conf_tx(local, sdata, ac,
1705                                         &sdata->tx_conf[non_acm_ac]))
1706                                 sdata_err(sdata,
1707                                           "failed to set TX queue parameters for queue %d\n",
1708                                           ac);
1709                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1710                         ret = true;
1711                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1712                                 tx_tspec->time_slice_start + HZ - now + 1);
1713                         break;
1714                 case TX_TSPEC_ACTION_NONE:
1715                         /* nothing now */
1716                         break;
1717                 }
1718         }
1719
1720         return ret;
1721 }
1722
1723 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1724 {
1725         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1726                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1727 }
1728
1729 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1730 {
1731         struct ieee80211_sub_if_data *sdata;
1732
1733         sdata = container_of(work, struct ieee80211_sub_if_data,
1734                              u.mgd.tx_tspec_wk.work);
1735         ieee80211_sta_handle_tspec_ac_params(sdata);
1736 }
1737
1738 /* MLME */
1739 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1740                                      struct ieee80211_sub_if_data *sdata,
1741                                      const u8 *wmm_param, size_t wmm_param_len)
1742 {
1743         struct ieee80211_tx_queue_params params;
1744         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1745         size_t left;
1746         int count;
1747         const u8 *pos;
1748         u8 uapsd_queues = 0;
1749
1750         if (!local->ops->conf_tx)
1751                 return false;
1752
1753         if (local->hw.queues < IEEE80211_NUM_ACS)
1754                 return false;
1755
1756         if (!wmm_param)
1757                 return false;
1758
1759         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1760                 return false;
1761
1762         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1763                 uapsd_queues = ifmgd->uapsd_queues;
1764
1765         count = wmm_param[6] & 0x0f;
1766         if (count == ifmgd->wmm_last_param_set)
1767                 return false;
1768         ifmgd->wmm_last_param_set = count;
1769
1770         pos = wmm_param + 8;
1771         left = wmm_param_len - 8;
1772
1773         memset(&params, 0, sizeof(params));
1774
1775         sdata->wmm_acm = 0;
1776         for (; left >= 4; left -= 4, pos += 4) {
1777                 int aci = (pos[0] >> 5) & 0x03;
1778                 int acm = (pos[0] >> 4) & 0x01;
1779                 bool uapsd = false;
1780                 int queue;
1781
1782                 switch (aci) {
1783                 case 1: /* AC_BK */
1784                         queue = 3;
1785                         if (acm)
1786                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1787                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1788                                 uapsd = true;
1789                         break;
1790                 case 2: /* AC_VI */
1791                         queue = 1;
1792                         if (acm)
1793                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1794                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1795                                 uapsd = true;
1796                         break;
1797                 case 3: /* AC_VO */
1798                         queue = 0;
1799                         if (acm)
1800                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1801                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1802                                 uapsd = true;
1803                         break;
1804                 case 0: /* AC_BE */
1805                 default:
1806                         queue = 2;
1807                         if (acm)
1808                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1809                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1810                                 uapsd = true;
1811                         break;
1812                 }
1813
1814                 params.aifs = pos[0] & 0x0f;
1815                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1816                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1817                 params.txop = get_unaligned_le16(pos + 2);
1818                 params.acm = acm;
1819                 params.uapsd = uapsd;
1820
1821                 mlme_dbg(sdata,
1822                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1823                          queue, aci, acm,
1824                          params.aifs, params.cw_min, params.cw_max,
1825                          params.txop, params.uapsd,
1826                          ifmgd->tx_tspec[queue].downgraded);
1827                 sdata->tx_conf[queue] = params;
1828                 if (!ifmgd->tx_tspec[queue].downgraded &&
1829                     drv_conf_tx(local, sdata, queue, &params))
1830                         sdata_err(sdata,
1831                                   "failed to set TX queue parameters for queue %d\n",
1832                                   queue);
1833         }
1834
1835         /* enable WMM or activate new settings */
1836         sdata->vif.bss_conf.qos = true;
1837         return true;
1838 }
1839
1840 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1841 {
1842         lockdep_assert_held(&sdata->local->mtx);
1843
1844         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1845         ieee80211_run_deferred_scan(sdata->local);
1846 }
1847
1848 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1849 {
1850         mutex_lock(&sdata->local->mtx);
1851         __ieee80211_stop_poll(sdata);
1852         mutex_unlock(&sdata->local->mtx);
1853 }
1854
1855 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1856                                            u16 capab, bool erp_valid, u8 erp)
1857 {
1858         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1859         u32 changed = 0;
1860         bool use_protection;
1861         bool use_short_preamble;
1862         bool use_short_slot;
1863
1864         if (erp_valid) {
1865                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1866                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1867         } else {
1868                 use_protection = false;
1869                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1870         }
1871
1872         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1873         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1874                 use_short_slot = true;
1875
1876         if (use_protection != bss_conf->use_cts_prot) {
1877                 bss_conf->use_cts_prot = use_protection;
1878                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1879         }
1880
1881         if (use_short_preamble != bss_conf->use_short_preamble) {
1882                 bss_conf->use_short_preamble = use_short_preamble;
1883                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1884         }
1885
1886         if (use_short_slot != bss_conf->use_short_slot) {
1887                 bss_conf->use_short_slot = use_short_slot;
1888                 changed |= BSS_CHANGED_ERP_SLOT;
1889         }
1890
1891         return changed;
1892 }
1893
1894 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1895                                      struct cfg80211_bss *cbss,
1896                                      u32 bss_info_changed)
1897 {
1898         struct ieee80211_bss *bss = (void *)cbss->priv;
1899         struct ieee80211_local *local = sdata->local;
1900         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1901
1902         bss_info_changed |= BSS_CHANGED_ASSOC;
1903         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1904                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1905
1906         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1907                 beacon_loss_count * bss_conf->beacon_int));
1908
1909         sdata->u.mgd.associated = cbss;
1910         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1911
1912         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1913
1914         if (sdata->vif.p2p) {
1915                 const struct cfg80211_bss_ies *ies;
1916
1917                 rcu_read_lock();
1918                 ies = rcu_dereference(cbss->ies);
1919                 if (ies) {
1920                         int ret;
1921
1922                         ret = cfg80211_get_p2p_attr(
1923                                         ies->data, ies->len,
1924                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1925                                         (u8 *) &bss_conf->p2p_noa_attr,
1926                                         sizeof(bss_conf->p2p_noa_attr));
1927                         if (ret >= 2) {
1928                                 sdata->u.mgd.p2p_noa_index =
1929                                         bss_conf->p2p_noa_attr.index;
1930                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1931                         }
1932                 }
1933                 rcu_read_unlock();
1934         }
1935
1936         /* just to be sure */
1937         ieee80211_stop_poll(sdata);
1938
1939         ieee80211_led_assoc(local, 1);
1940
1941         if (sdata->u.mgd.have_beacon) {
1942                 /*
1943                  * If the AP is buggy we may get here with no DTIM period
1944                  * known, so assume it's 1 which is the only safe assumption
1945                  * in that case, although if the TIM IE is broken powersave
1946                  * probably just won't work at all.
1947                  */
1948                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1949                 bss_conf->beacon_rate = bss->beacon_rate;
1950                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1951         } else {
1952                 bss_conf->beacon_rate = NULL;
1953                 bss_conf->dtim_period = 0;
1954         }
1955
1956         bss_conf->assoc = 1;
1957
1958         /* Tell the driver to monitor connection quality (if supported) */
1959         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1960             bss_conf->cqm_rssi_thold)
1961                 bss_info_changed |= BSS_CHANGED_CQM;
1962
1963         /* Enable ARP filtering */
1964         if (bss_conf->arp_addr_cnt)
1965                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1966
1967         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1968
1969         mutex_lock(&local->iflist_mtx);
1970         ieee80211_recalc_ps(local, -1);
1971         mutex_unlock(&local->iflist_mtx);
1972
1973         ieee80211_recalc_smps(sdata);
1974         ieee80211_recalc_ps_vif(sdata);
1975
1976         netif_carrier_on(sdata->dev);
1977 }
1978
1979 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1980                                    u16 stype, u16 reason, bool tx,
1981                                    u8 *frame_buf)
1982 {
1983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1984         struct ieee80211_local *local = sdata->local;
1985         u32 changed = 0;
1986
1987         sdata_assert_lock(sdata);
1988
1989         if (WARN_ON_ONCE(tx && !frame_buf))
1990                 return;
1991
1992         if (WARN_ON(!ifmgd->associated))
1993                 return;
1994
1995         ieee80211_stop_poll(sdata);
1996
1997         ifmgd->associated = NULL;
1998         netif_carrier_off(sdata->dev);
1999
2000         /*
2001          * if we want to get out of ps before disassoc (why?) we have
2002          * to do it before sending disassoc, as otherwise the null-packet
2003          * won't be valid.
2004          */
2005         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2006                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2007                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2008         }
2009         local->ps_sdata = NULL;
2010
2011         /* disable per-vif ps */
2012         ieee80211_recalc_ps_vif(sdata);
2013
2014         /* make sure ongoing transmission finishes */
2015         synchronize_net();
2016
2017         /*
2018          * drop any frame before deauth/disassoc, this can be data or
2019          * management frame. Since we are disconnecting, we should not
2020          * insist sending these frames which can take time and delay
2021          * the disconnection and possible the roaming.
2022          */
2023         if (tx)
2024                 ieee80211_flush_queues(local, sdata, true);
2025
2026         /* deauthenticate/disassociate now */
2027         if (tx || frame_buf)
2028                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2029                                                reason, tx, frame_buf);
2030
2031         /* flush out frame - make sure the deauth was actually sent */
2032         if (tx)
2033                 ieee80211_flush_queues(local, sdata, false);
2034
2035         /* clear bssid only after building the needed mgmt frames */
2036         memset(ifmgd->bssid, 0, ETH_ALEN);
2037
2038         /* remove AP and TDLS peers */
2039         sta_info_flush(sdata);
2040
2041         /* finally reset all BSS / config parameters */
2042         changed |= ieee80211_reset_erp_info(sdata);
2043
2044         ieee80211_led_assoc(local, 0);
2045         changed |= BSS_CHANGED_ASSOC;
2046         sdata->vif.bss_conf.assoc = false;
2047
2048         ifmgd->p2p_noa_index = -1;
2049         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2050                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2051
2052         /* on the next assoc, re-program HT/VHT parameters */
2053         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2054         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2055         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2056         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2057
2058         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2059
2060         del_timer_sync(&local->dynamic_ps_timer);
2061         cancel_work_sync(&local->dynamic_ps_enable_work);
2062
2063         /* Disable ARP filtering */
2064         if (sdata->vif.bss_conf.arp_addr_cnt)
2065                 changed |= BSS_CHANGED_ARP_FILTER;
2066
2067         sdata->vif.bss_conf.qos = false;
2068         changed |= BSS_CHANGED_QOS;
2069
2070         /* The BSSID (not really interesting) and HT changed */
2071         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2072         ieee80211_bss_info_change_notify(sdata, changed);
2073
2074         /* disassociated - set to defaults now */
2075         ieee80211_set_wmm_default(sdata, false);
2076
2077         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2078         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2079         del_timer_sync(&sdata->u.mgd.timer);
2080         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2081
2082         sdata->vif.bss_conf.dtim_period = 0;
2083         sdata->vif.bss_conf.beacon_rate = NULL;
2084
2085         ifmgd->have_beacon = false;
2086
2087         ifmgd->flags = 0;
2088         mutex_lock(&local->mtx);
2089         ieee80211_vif_release_channel(sdata);
2090
2091         sdata->vif.csa_active = false;
2092         ifmgd->csa_waiting_bcn = false;
2093         if (sdata->csa_block_tx) {
2094                 ieee80211_wake_vif_queues(local, sdata,
2095                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2096                 sdata->csa_block_tx = false;
2097         }
2098         mutex_unlock(&local->mtx);
2099
2100         /* existing TX TSPEC sessions no longer exist */
2101         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2102         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2103
2104         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2105 }
2106
2107 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2108                              struct ieee80211_hdr *hdr)
2109 {
2110         /*
2111          * We can postpone the mgd.timer whenever receiving unicast frames
2112          * from AP because we know that the connection is working both ways
2113          * at that time. But multicast frames (and hence also beacons) must
2114          * be ignored here, because we need to trigger the timer during
2115          * data idle periods for sending the periodic probe request to the
2116          * AP we're connected to.
2117          */
2118         if (is_multicast_ether_addr(hdr->addr1))
2119                 return;
2120
2121         ieee80211_sta_reset_conn_monitor(sdata);
2122 }
2123
2124 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2125 {
2126         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2127         struct ieee80211_local *local = sdata->local;
2128
2129         mutex_lock(&local->mtx);
2130         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2131                 goto out;
2132
2133         __ieee80211_stop_poll(sdata);
2134
2135         mutex_lock(&local->iflist_mtx);
2136         ieee80211_recalc_ps(local, -1);
2137         mutex_unlock(&local->iflist_mtx);
2138
2139         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2140                 goto out;
2141
2142         /*
2143          * We've received a probe response, but are not sure whether
2144          * we have or will be receiving any beacons or data, so let's
2145          * schedule the timers again, just in case.
2146          */
2147         ieee80211_sta_reset_beacon_monitor(sdata);
2148
2149         mod_timer(&ifmgd->conn_mon_timer,
2150                   round_jiffies_up(jiffies +
2151                                    IEEE80211_CONNECTION_IDLE_TIME));
2152 out:
2153         mutex_unlock(&local->mtx);
2154 }
2155
2156 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2157                                            struct ieee80211_hdr *hdr,
2158                                            u16 tx_time)
2159 {
2160         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2161         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2162         int ac = ieee80211_ac_from_tid(tid);
2163         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2164         unsigned long now = jiffies;
2165
2166         if (likely(!tx_tspec->admitted_time))
2167                 return;
2168
2169         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2170                 tx_tspec->consumed_tx_time = 0;
2171                 tx_tspec->time_slice_start = now;
2172
2173                 if (tx_tspec->downgraded) {
2174                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2175                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2176                 }
2177         }
2178
2179         if (tx_tspec->downgraded)
2180                 return;
2181
2182         tx_tspec->consumed_tx_time += tx_time;
2183
2184         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2185                 tx_tspec->downgraded = true;
2186                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2187                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2188         }
2189 }
2190
2191 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2192                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2193 {
2194         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2195
2196         if (!ieee80211_is_data(hdr->frame_control))
2197             return;
2198
2199         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2200             sdata->u.mgd.probe_send_count > 0) {
2201                 if (ack)
2202                         ieee80211_sta_reset_conn_monitor(sdata);
2203                 else
2204                         sdata->u.mgd.nullfunc_failed = true;
2205                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2206                 return;
2207         }
2208
2209         if (ack)
2210                 ieee80211_sta_reset_conn_monitor(sdata);
2211 }
2212
2213 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2214 {
2215         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2216         const u8 *ssid;
2217         u8 *dst = ifmgd->associated->bssid;
2218         u8 unicast_limit = max(1, max_probe_tries - 3);
2219
2220         /*
2221          * Try sending broadcast probe requests for the last three
2222          * probe requests after the first ones failed since some
2223          * buggy APs only support broadcast probe requests.
2224          */
2225         if (ifmgd->probe_send_count >= unicast_limit)
2226                 dst = NULL;
2227
2228         /*
2229          * When the hardware reports an accurate Tx ACK status, it's
2230          * better to send a nullfunc frame instead of a probe request,
2231          * as it will kick us off the AP quickly if we aren't associated
2232          * anymore. The timeout will be reset if the frame is ACKed by
2233          * the AP.
2234          */
2235         ifmgd->probe_send_count++;
2236
2237         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2238                 ifmgd->nullfunc_failed = false;
2239                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2240         } else {
2241                 int ssid_len;
2242
2243                 rcu_read_lock();
2244                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2245                 if (WARN_ON_ONCE(ssid == NULL))
2246                         ssid_len = 0;
2247                 else
2248                         ssid_len = ssid[1];
2249
2250                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
2251                                          ssid + 2, ssid_len, NULL,
2252                                          0, (u32) -1, true, 0,
2253                                          ifmgd->associated->channel, false);
2254                 rcu_read_unlock();
2255         }
2256
2257         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2258         run_again(sdata, ifmgd->probe_timeout);
2259 }
2260
2261 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2262                                    bool beacon)
2263 {
2264         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2265         bool already = false;
2266
2267         if (!ieee80211_sdata_running(sdata))
2268                 return;
2269
2270         sdata_lock(sdata);
2271
2272         if (!ifmgd->associated)
2273                 goto out;
2274
2275         mutex_lock(&sdata->local->mtx);
2276
2277         if (sdata->local->tmp_channel || sdata->local->scanning) {
2278                 mutex_unlock(&sdata->local->mtx);
2279                 goto out;
2280         }
2281
2282         if (beacon) {
2283                 mlme_dbg_ratelimited(sdata,
2284                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2285                                      beacon_loss_count);
2286
2287                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2288         }
2289
2290         /*
2291          * The driver/our work has already reported this event or the
2292          * connection monitoring has kicked in and we have already sent
2293          * a probe request. Or maybe the AP died and the driver keeps
2294          * reporting until we disassociate...
2295          *
2296          * In either case we have to ignore the current call to this
2297          * function (except for setting the correct probe reason bit)
2298          * because otherwise we would reset the timer every time and
2299          * never check whether we received a probe response!
2300          */
2301         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2302                 already = true;
2303
2304         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2305
2306         mutex_unlock(&sdata->local->mtx);
2307
2308         if (already)
2309                 goto out;
2310
2311         mutex_lock(&sdata->local->iflist_mtx);
2312         ieee80211_recalc_ps(sdata->local, -1);
2313         mutex_unlock(&sdata->local->iflist_mtx);
2314
2315         ifmgd->probe_send_count = 0;
2316         ieee80211_mgd_probe_ap_send(sdata);
2317  out:
2318         sdata_unlock(sdata);
2319 }
2320
2321 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2322                                           struct ieee80211_vif *vif)
2323 {
2324         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2325         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2326         struct cfg80211_bss *cbss;
2327         struct sk_buff *skb;
2328         const u8 *ssid;
2329         int ssid_len;
2330
2331         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2332                 return NULL;
2333
2334         sdata_assert_lock(sdata);
2335
2336         if (ifmgd->associated)
2337                 cbss = ifmgd->associated;
2338         else if (ifmgd->auth_data)
2339                 cbss = ifmgd->auth_data->bss;
2340         else if (ifmgd->assoc_data)
2341                 cbss = ifmgd->assoc_data->bss;
2342         else
2343                 return NULL;
2344
2345         rcu_read_lock();
2346         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2347         if (WARN_ON_ONCE(ssid == NULL))
2348                 ssid_len = 0;
2349         else
2350                 ssid_len = ssid[1];
2351
2352         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2353                                         (u32) -1, cbss->channel,
2354                                         ssid + 2, ssid_len,
2355                                         NULL, 0, true);
2356         rcu_read_unlock();
2357
2358         return skb;
2359 }
2360 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2361
2362 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2363 {
2364         struct ieee80211_local *local = sdata->local;
2365         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2366         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2367
2368         sdata_lock(sdata);
2369         if (!ifmgd->associated) {
2370                 sdata_unlock(sdata);
2371                 return;
2372         }
2373
2374         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2375                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2376                                true, frame_buf);
2377         mutex_lock(&local->mtx);
2378         sdata->vif.csa_active = false;
2379         ifmgd->csa_waiting_bcn = false;
2380         if (sdata->csa_block_tx) {
2381                 ieee80211_wake_vif_queues(local, sdata,
2382                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2383                 sdata->csa_block_tx = false;
2384         }
2385         mutex_unlock(&local->mtx);
2386
2387         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2388                               IEEE80211_DEAUTH_FRAME_LEN);
2389         sdata_unlock(sdata);
2390 }
2391
2392 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2393 {
2394         struct ieee80211_sub_if_data *sdata =
2395                 container_of(work, struct ieee80211_sub_if_data,
2396                              u.mgd.beacon_connection_loss_work);
2397         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2398         struct sta_info *sta;
2399
2400         if (ifmgd->associated) {
2401                 rcu_read_lock();
2402                 sta = sta_info_get(sdata, ifmgd->bssid);
2403                 if (sta)
2404                         sta->beacon_loss_count++;
2405                 rcu_read_unlock();
2406         }
2407
2408         if (ifmgd->connection_loss) {
2409                 sdata_info(sdata, "Connection to AP %pM lost\n",
2410                            ifmgd->bssid);
2411                 __ieee80211_disconnect(sdata);
2412         } else {
2413                 ieee80211_mgd_probe_ap(sdata, true);
2414         }
2415 }
2416
2417 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2418 {
2419         struct ieee80211_sub_if_data *sdata =
2420                 container_of(work, struct ieee80211_sub_if_data,
2421                              u.mgd.csa_connection_drop_work);
2422
2423         __ieee80211_disconnect(sdata);
2424 }
2425
2426 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2427 {
2428         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2429         struct ieee80211_hw *hw = &sdata->local->hw;
2430
2431         trace_api_beacon_loss(sdata);
2432
2433         sdata->u.mgd.connection_loss = false;
2434         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2435 }
2436 EXPORT_SYMBOL(ieee80211_beacon_loss);
2437
2438 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2439 {
2440         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2441         struct ieee80211_hw *hw = &sdata->local->hw;
2442
2443         trace_api_connection_loss(sdata);
2444
2445         sdata->u.mgd.connection_loss = true;
2446         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2447 }
2448 EXPORT_SYMBOL(ieee80211_connection_loss);
2449
2450
2451 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2452                                         bool assoc)
2453 {
2454         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2455
2456         sdata_assert_lock(sdata);
2457
2458         if (!assoc) {
2459                 /*
2460                  * we are not authenticated yet, the only timer that could be
2461                  * running is the timeout for the authentication response which
2462                  * which is not relevant anymore.
2463                  */
2464                 del_timer_sync(&sdata->u.mgd.timer);
2465                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2466
2467                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2468                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2469                 sdata->u.mgd.flags = 0;
2470                 mutex_lock(&sdata->local->mtx);
2471                 ieee80211_vif_release_channel(sdata);
2472                 mutex_unlock(&sdata->local->mtx);
2473         }
2474
2475         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2476         kfree(auth_data);
2477         sdata->u.mgd.auth_data = NULL;
2478 }
2479
2480 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2481                                      struct ieee80211_mgmt *mgmt, size_t len)
2482 {
2483         struct ieee80211_local *local = sdata->local;
2484         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2485         u8 *pos;
2486         struct ieee802_11_elems elems;
2487         u32 tx_flags = 0;
2488
2489         pos = mgmt->u.auth.variable;
2490         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2491         if (!elems.challenge)
2492                 return;
2493         auth_data->expected_transaction = 4;
2494         drv_mgd_prepare_tx(sdata->local, sdata);
2495         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2496                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2497                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2498         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2499                             elems.challenge - 2, elems.challenge_len + 2,
2500                             auth_data->bss->bssid, auth_data->bss->bssid,
2501                             auth_data->key, auth_data->key_len,
2502                             auth_data->key_idx, tx_flags);
2503 }
2504
2505 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2506                                    struct ieee80211_mgmt *mgmt, size_t len)
2507 {
2508         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2509         u8 bssid[ETH_ALEN];
2510         u16 auth_alg, auth_transaction, status_code;
2511         struct sta_info *sta;
2512
2513         sdata_assert_lock(sdata);
2514
2515         if (len < 24 + 6)
2516                 return;
2517
2518         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2519                 return;
2520
2521         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2522
2523         if (!ether_addr_equal(bssid, mgmt->bssid))
2524                 return;
2525
2526         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2527         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2528         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2529
2530         if (auth_alg != ifmgd->auth_data->algorithm ||
2531             auth_transaction != ifmgd->auth_data->expected_transaction) {
2532                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2533                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2534                            auth_transaction,
2535                            ifmgd->auth_data->expected_transaction);
2536                 return;
2537         }
2538
2539         if (status_code != WLAN_STATUS_SUCCESS) {
2540                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2541                            mgmt->sa, status_code);
2542                 ieee80211_destroy_auth_data(sdata, false);
2543                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2544                 return;
2545         }
2546
2547         switch (ifmgd->auth_data->algorithm) {
2548         case WLAN_AUTH_OPEN:
2549         case WLAN_AUTH_LEAP:
2550         case WLAN_AUTH_FT:
2551         case WLAN_AUTH_SAE:
2552                 break;
2553         case WLAN_AUTH_SHARED_KEY:
2554                 if (ifmgd->auth_data->expected_transaction != 4) {
2555                         ieee80211_auth_challenge(sdata, mgmt, len);
2556                         /* need another frame */
2557                         return;
2558                 }
2559                 break;
2560         default:
2561                 WARN_ONCE(1, "invalid auth alg %d",
2562                           ifmgd->auth_data->algorithm);
2563                 return;
2564         }
2565
2566         sdata_info(sdata, "authenticated\n");
2567         ifmgd->auth_data->done = true;
2568         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2569         ifmgd->auth_data->timeout_started = true;
2570         run_again(sdata, ifmgd->auth_data->timeout);
2571
2572         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2573             ifmgd->auth_data->expected_transaction != 2) {
2574                 /*
2575                  * Report auth frame to user space for processing since another
2576                  * round of Authentication frames is still needed.
2577                  */
2578                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2579                 return;
2580         }
2581
2582         /* move station state to auth */
2583         mutex_lock(&sdata->local->sta_mtx);
2584         sta = sta_info_get(sdata, bssid);
2585         if (!sta) {
2586                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2587                 goto out_err;
2588         }
2589         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2590                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2591                 goto out_err;
2592         }
2593         mutex_unlock(&sdata->local->sta_mtx);
2594
2595         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2596         return;
2597  out_err:
2598         mutex_unlock(&sdata->local->sta_mtx);
2599         /* ignore frame -- wait for timeout */
2600 }
2601
2602 #define case_WLAN(type) \
2603         case WLAN_REASON_##type: return #type
2604
2605 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2606 {
2607         switch (reason_code) {
2608         case_WLAN(UNSPECIFIED);
2609         case_WLAN(PREV_AUTH_NOT_VALID);
2610         case_WLAN(DEAUTH_LEAVING);
2611         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2612         case_WLAN(DISASSOC_AP_BUSY);
2613         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2614         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2615         case_WLAN(DISASSOC_STA_HAS_LEFT);
2616         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2617         case_WLAN(DISASSOC_BAD_POWER);
2618         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2619         case_WLAN(INVALID_IE);
2620         case_WLAN(MIC_FAILURE);
2621         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2622         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2623         case_WLAN(IE_DIFFERENT);
2624         case_WLAN(INVALID_GROUP_CIPHER);
2625         case_WLAN(INVALID_PAIRWISE_CIPHER);
2626         case_WLAN(INVALID_AKMP);
2627         case_WLAN(UNSUPP_RSN_VERSION);
2628         case_WLAN(INVALID_RSN_IE_CAP);
2629         case_WLAN(IEEE8021X_FAILED);
2630         case_WLAN(CIPHER_SUITE_REJECTED);
2631         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2632         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2633         case_WLAN(DISASSOC_LOW_ACK);
2634         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2635         case_WLAN(QSTA_LEAVE_QBSS);
2636         case_WLAN(QSTA_NOT_USE);
2637         case_WLAN(QSTA_REQUIRE_SETUP);
2638         case_WLAN(QSTA_TIMEOUT);
2639         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2640         case_WLAN(MESH_PEER_CANCELED);
2641         case_WLAN(MESH_MAX_PEERS);
2642         case_WLAN(MESH_CONFIG);
2643         case_WLAN(MESH_CLOSE);
2644         case_WLAN(MESH_MAX_RETRIES);
2645         case_WLAN(MESH_CONFIRM_TIMEOUT);
2646         case_WLAN(MESH_INVALID_GTK);
2647         case_WLAN(MESH_INCONSISTENT_PARAM);
2648         case_WLAN(MESH_INVALID_SECURITY);
2649         case_WLAN(MESH_PATH_ERROR);
2650         case_WLAN(MESH_PATH_NOFORWARD);
2651         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2652         case_WLAN(MAC_EXISTS_IN_MBSS);
2653         case_WLAN(MESH_CHAN_REGULATORY);
2654         case_WLAN(MESH_CHAN);
2655         default: return "<unknown>";
2656         }
2657 }
2658
2659 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2660                                      struct ieee80211_mgmt *mgmt, size_t len)
2661 {
2662         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2663         const u8 *bssid = NULL;
2664         u16 reason_code;
2665
2666         sdata_assert_lock(sdata);
2667
2668         if (len < 24 + 2)
2669                 return;
2670
2671         if (!ifmgd->associated ||
2672             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2673                 return;
2674
2675         bssid = ifmgd->associated->bssid;
2676
2677         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2678
2679         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2680                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2681
2682         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2683
2684         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2685 }
2686
2687
2688 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2689                                        struct ieee80211_mgmt *mgmt, size_t len)
2690 {
2691         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2692         u16 reason_code;
2693
2694         sdata_assert_lock(sdata);
2695
2696         if (len < 24 + 2)
2697                 return;
2698
2699         if (!ifmgd->associated ||
2700             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2701                 return;
2702
2703         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2704
2705         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2706                    mgmt->sa, reason_code);
2707
2708         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2709
2710         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2711 }
2712
2713 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2714                                 u8 *supp_rates, unsigned int supp_rates_len,
2715                                 u32 *rates, u32 *basic_rates,
2716                                 bool *have_higher_than_11mbit,
2717                                 int *min_rate, int *min_rate_index,
2718                                 int shift, u32 rate_flags)
2719 {
2720         int i, j;
2721
2722         for (i = 0; i < supp_rates_len; i++) {
2723                 int rate = supp_rates[i] & 0x7f;
2724                 bool is_basic = !!(supp_rates[i] & 0x80);
2725
2726                 if ((rate * 5 * (1 << shift)) > 110)
2727                         *have_higher_than_11mbit = true;
2728
2729                 /*
2730                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2731                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2732                  *
2733                  * Note: Even through the membership selector and the basic
2734                  *       rate flag share the same bit, they are not exactly
2735                  *       the same.
2736                  */
2737                 if (!!(supp_rates[i] & 0x80) &&
2738                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2739                         continue;
2740
2741                 for (j = 0; j < sband->n_bitrates; j++) {
2742                         struct ieee80211_rate *br;
2743                         int brate;
2744
2745                         br = &sband->bitrates[j];
2746                         if ((rate_flags & br->flags) != rate_flags)
2747                                 continue;
2748
2749                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2750                         if (brate == rate) {
2751                                 *rates |= BIT(j);
2752                                 if (is_basic)
2753                                         *basic_rates |= BIT(j);
2754                                 if ((rate * 5) < *min_rate) {
2755                                         *min_rate = rate * 5;
2756                                         *min_rate_index = j;
2757                                 }
2758                                 break;
2759                         }
2760                 }
2761         }
2762 }
2763
2764 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2765                                          bool assoc)
2766 {
2767         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2768
2769         sdata_assert_lock(sdata);
2770
2771         if (!assoc) {
2772                 /*
2773                  * we are not associated yet, the only timer that could be
2774                  * running is the timeout for the association response which
2775                  * which is not relevant anymore.
2776                  */
2777                 del_timer_sync(&sdata->u.mgd.timer);
2778                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2779
2780                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2781                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2782                 sdata->u.mgd.flags = 0;
2783                 mutex_lock(&sdata->local->mtx);
2784                 ieee80211_vif_release_channel(sdata);
2785                 mutex_unlock(&sdata->local->mtx);
2786         }
2787
2788         kfree(assoc_data);
2789         sdata->u.mgd.assoc_data = NULL;
2790 }
2791
2792 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2793                                     struct cfg80211_bss *cbss,
2794                                     struct ieee80211_mgmt *mgmt, size_t len)
2795 {
2796         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2797         struct ieee80211_local *local = sdata->local;
2798         struct ieee80211_supported_band *sband;
2799         struct sta_info *sta;
2800         u8 *pos;
2801         u16 capab_info, aid;
2802         struct ieee802_11_elems elems;
2803         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2804         const struct cfg80211_bss_ies *bss_ies = NULL;
2805         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2806         u32 changed = 0;
2807         int err;
2808         bool ret;
2809
2810         /* AssocResp and ReassocResp have identical structure */
2811
2812         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2813         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2814
2815         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2816                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2817                            aid);
2818         aid &= ~(BIT(15) | BIT(14));
2819
2820         ifmgd->broken_ap = false;
2821
2822         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2823                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2824                            aid);
2825                 aid = 0;
2826                 ifmgd->broken_ap = true;
2827         }
2828
2829         pos = mgmt->u.assoc_resp.variable;
2830         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2831
2832         if (!elems.supp_rates) {
2833                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2834                 return false;
2835         }
2836
2837         ifmgd->aid = aid;
2838         ifmgd->tdls_chan_switch_prohibited =
2839                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2840                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2841
2842         /*
2843          * Some APs are erroneously not including some information in their
2844          * (re)association response frames. Try to recover by using the data
2845          * from the beacon or probe response. This seems to afflict mobile
2846          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2847          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2848          */
2849         if ((assoc_data->wmm && !elems.wmm_param) ||
2850             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2851              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2852             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2853              (!elems.vht_cap_elem || !elems.vht_operation))) {
2854                 const struct cfg80211_bss_ies *ies;
2855                 struct ieee802_11_elems bss_elems;
2856
2857                 rcu_read_lock();
2858                 ies = rcu_dereference(cbss->ies);
2859                 if (ies)
2860                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2861                                           GFP_ATOMIC);
2862                 rcu_read_unlock();
2863                 if (!bss_ies)
2864                         return false;
2865
2866                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2867                                        false, &bss_elems);
2868                 if (assoc_data->wmm &&
2869                     !elems.wmm_param && bss_elems.wmm_param) {
2870                         elems.wmm_param = bss_elems.wmm_param;
2871                         sdata_info(sdata,
2872                                    "AP bug: WMM param missing from AssocResp\n");
2873                 }
2874
2875                 /*
2876                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2877                  * have to include the IEs in the (re)association response.
2878                  */
2879                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2880                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2881                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2882                         sdata_info(sdata,
2883                                    "AP bug: HT capability missing from AssocResp\n");
2884                 }
2885                 if (!elems.ht_operation && bss_elems.ht_operation &&
2886                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2887                         elems.ht_operation = bss_elems.ht_operation;
2888                         sdata_info(sdata,
2889                                    "AP bug: HT operation missing from AssocResp\n");
2890                 }
2891                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2892                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2893                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2894                         sdata_info(sdata,
2895                                    "AP bug: VHT capa missing from AssocResp\n");
2896                 }
2897                 if (!elems.vht_operation && bss_elems.vht_operation &&
2898                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2899                         elems.vht_operation = bss_elems.vht_operation;
2900                         sdata_info(sdata,
2901                                    "AP bug: VHT operation missing from AssocResp\n");
2902                 }
2903         }
2904
2905         /*
2906          * We previously checked these in the beacon/probe response, so
2907          * they should be present here. This is just a safety net.
2908          */
2909         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2910             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2911                 sdata_info(sdata,
2912                            "HT AP is missing WMM params or HT capability/operation\n");
2913                 ret = false;
2914                 goto out;
2915         }
2916
2917         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2918             (!elems.vht_cap_elem || !elems.vht_operation)) {
2919                 sdata_info(sdata,
2920                            "VHT AP is missing VHT capability/operation\n");
2921                 ret = false;
2922                 goto out;
2923         }
2924
2925         mutex_lock(&sdata->local->sta_mtx);
2926         /*
2927          * station info was already allocated and inserted before
2928          * the association and should be available to us
2929          */
2930         sta = sta_info_get(sdata, cbss->bssid);
2931         if (WARN_ON(!sta)) {
2932                 mutex_unlock(&sdata->local->sta_mtx);
2933                 ret = false;
2934                 goto out;
2935         }
2936
2937         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2938
2939         /* Set up internal HT/VHT capabilities */
2940         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2941                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2942                                                   elems.ht_cap_elem, sta);
2943
2944         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2945                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2946                                                     elems.vht_cap_elem, sta);
2947
2948         /*
2949          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2950          * in their association response, so ignore that data for our own
2951          * configuration. If it changed since the last beacon, we'll get the
2952          * next beacon and update then.
2953          */
2954
2955         /*
2956          * If an operating mode notification IE is present, override the
2957          * NSS calculation (that would be done in rate_control_rate_init())
2958          * and use the # of streams from that element.
2959          */
2960         if (elems.opmode_notif &&
2961             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2962                 u8 nss;
2963
2964                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2965                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2966                 nss += 1;
2967                 sta->sta.rx_nss = nss;
2968         }
2969
2970         rate_control_rate_init(sta);
2971
2972         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2973                 set_sta_flag(sta, WLAN_STA_MFP);
2974
2975         sta->sta.wme = elems.wmm_param;
2976
2977         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2978         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2979                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2980         if (err) {
2981                 sdata_info(sdata,
2982                            "failed to move station %pM to desired state\n",
2983                            sta->sta.addr);
2984                 WARN_ON(__sta_info_destroy(sta));
2985                 mutex_unlock(&sdata->local->sta_mtx);
2986                 ret = false;
2987                 goto out;
2988         }
2989
2990         mutex_unlock(&sdata->local->sta_mtx);
2991
2992         /*
2993          * Always handle WMM once after association regardless
2994          * of the first value the AP uses. Setting -1 here has
2995          * that effect because the AP values is an unsigned
2996          * 4-bit value.
2997          */
2998         ifmgd->wmm_last_param_set = -1;
2999
3000         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
3001                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3002                                          elems.wmm_param_len);
3003         else
3004                 ieee80211_set_wmm_default(sdata, false);
3005         changed |= BSS_CHANGED_QOS;
3006
3007         /* set AID and assoc capability,
3008          * ieee80211_set_associated() will tell the driver */
3009         bss_conf->aid = aid;
3010         bss_conf->assoc_capability = capab_info;
3011         ieee80211_set_associated(sdata, cbss, changed);
3012
3013         /*
3014          * If we're using 4-addr mode, let the AP know that we're
3015          * doing so, so that it can create the STA VLAN on its side
3016          */
3017         if (ifmgd->use_4addr)
3018                 ieee80211_send_4addr_nullfunc(local, sdata);
3019
3020         /*
3021          * Start timer to probe the connection to the AP now.
3022          * Also start the timer that will detect beacon loss.
3023          */
3024         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3025         ieee80211_sta_reset_beacon_monitor(sdata);
3026
3027         ret = true;
3028  out:
3029         kfree(bss_ies);
3030         return ret;
3031 }
3032
3033 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3034                                          struct ieee80211_mgmt *mgmt,
3035                                          size_t len)
3036 {
3037         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3038         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3039         u16 capab_info, status_code, aid;
3040         struct ieee802_11_elems elems;
3041         int ac, uapsd_queues = -1;
3042         u8 *pos;
3043         bool reassoc;
3044         struct cfg80211_bss *bss;
3045
3046         sdata_assert_lock(sdata);
3047
3048         if (!assoc_data)
3049                 return;
3050         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3051                 return;
3052
3053         /*
3054          * AssocResp and ReassocResp have identical structure, so process both
3055          * of them in this function.
3056          */
3057
3058         if (len < 24 + 6)
3059                 return;
3060
3061         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3062         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3063         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3064         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3065
3066         sdata_info(sdata,
3067                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3068                    reassoc ? "Rea" : "A", mgmt->sa,
3069                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3070
3071         pos = mgmt->u.assoc_resp.variable;
3072         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3073
3074         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3075             elems.timeout_int &&
3076             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3077                 u32 tu, ms;
3078                 tu = le32_to_cpu(elems.timeout_int->value);
3079                 ms = tu * 1024 / 1000;
3080                 sdata_info(sdata,
3081                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3082                            mgmt->sa, tu, ms);
3083                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3084                 assoc_data->timeout_started = true;
3085                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3086                         run_again(sdata, assoc_data->timeout);
3087                 return;
3088         }
3089
3090         bss = assoc_data->bss;
3091
3092         if (status_code != WLAN_STATUS_SUCCESS) {
3093                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3094                            mgmt->sa, status_code);
3095                 ieee80211_destroy_assoc_data(sdata, false);
3096         } else {
3097                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3098                         /* oops -- internal error -- send timeout for now */
3099                         ieee80211_destroy_assoc_data(sdata, false);
3100                         cfg80211_assoc_timeout(sdata->dev, bss);
3101                         return;
3102                 }
3103                 sdata_info(sdata, "associated\n");
3104
3105                 /*
3106                  * destroy assoc_data afterwards, as otherwise an idle
3107                  * recalc after assoc_data is NULL but before associated
3108                  * is set can cause the interface to go idle
3109                  */
3110                 ieee80211_destroy_assoc_data(sdata, true);
3111
3112                 /* get uapsd queues configuration */
3113                 uapsd_queues = 0;
3114                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3115                         if (sdata->tx_conf[ac].uapsd)
3116                                 uapsd_queues |= BIT(ac);
3117         }
3118
3119         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3120 }
3121
3122 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3123                                   struct ieee80211_mgmt *mgmt, size_t len,
3124                                   struct ieee80211_rx_status *rx_status,
3125                                   struct ieee802_11_elems *elems)
3126 {
3127         struct ieee80211_local *local = sdata->local;
3128         struct ieee80211_bss *bss;
3129         struct ieee80211_channel *channel;
3130
3131         sdata_assert_lock(sdata);
3132
3133         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3134         if (!channel)
3135                 return;
3136
3137         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3138                                         channel);
3139         if (bss) {
3140                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3141                 ieee80211_rx_bss_put(local, bss);
3142         }
3143 }
3144
3145
3146 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3147                                          struct sk_buff *skb)
3148 {
3149         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3150         struct ieee80211_if_managed *ifmgd;
3151         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3152         size_t baselen, len = skb->len;
3153         struct ieee802_11_elems elems;
3154
3155         ifmgd = &sdata->u.mgd;
3156
3157         sdata_assert_lock(sdata);
3158
3159         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3160                 return; /* ignore ProbeResp to foreign address */
3161
3162         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3163         if (baselen > len)
3164                 return;
3165
3166         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3167                                false, &elems);
3168
3169         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3170
3171         if (ifmgd->associated &&
3172             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3173                 ieee80211_reset_ap_probe(sdata);
3174
3175         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3176             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3177                 /* got probe response, continue with auth */
3178                 sdata_info(sdata, "direct probe responded\n");
3179                 ifmgd->auth_data->tries = 0;
3180                 ifmgd->auth_data->timeout = jiffies;
3181                 ifmgd->auth_data->timeout_started = true;
3182                 run_again(sdata, ifmgd->auth_data->timeout);
3183         }
3184 }
3185
3186 /*
3187  * This is the canonical list of information elements we care about,
3188  * the filter code also gives us all changes to the Microsoft OUI
3189  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3190  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3191  * changes to requested client power.
3192  *
3193  * We implement beacon filtering in software since that means we can
3194  * avoid processing the frame here and in cfg80211, and userspace
3195  * will not be able to tell whether the hardware supports it or not.
3196  *
3197  * XXX: This list needs to be dynamic -- userspace needs to be able to
3198  *      add items it requires. It also needs to be able to tell us to
3199  *      look out for other vendor IEs.
3200  */
3201 static const u64 care_about_ies =
3202         (1ULL << WLAN_EID_COUNTRY) |
3203         (1ULL << WLAN_EID_ERP_INFO) |
3204         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3205         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3206         (1ULL << WLAN_EID_HT_CAPABILITY) |
3207         (1ULL << WLAN_EID_HT_OPERATION);
3208
3209 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3210                                      struct ieee80211_mgmt *mgmt, size_t len,
3211                                      struct ieee80211_rx_status *rx_status)
3212 {
3213         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3214         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3215         size_t baselen;
3216         struct ieee802_11_elems elems;
3217         struct ieee80211_local *local = sdata->local;
3218         struct ieee80211_chanctx_conf *chanctx_conf;
3219         struct ieee80211_channel *chan;
3220         struct sta_info *sta;
3221         u32 changed = 0;
3222         bool erp_valid;
3223         u8 erp_value = 0;
3224         u32 ncrc;
3225         u8 *bssid;
3226         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3227
3228         sdata_assert_lock(sdata);
3229
3230         /* Process beacon from the current BSS */
3231         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3232         if (baselen > len)
3233                 return;
3234
3235         rcu_read_lock();
3236         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3237         if (!chanctx_conf) {
3238                 rcu_read_unlock();
3239                 return;
3240         }
3241
3242         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3243                 rcu_read_unlock();
3244                 return;
3245         }
3246         chan = chanctx_conf->def.chan;
3247         rcu_read_unlock();
3248
3249         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3250             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3251                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3252                                        len - baselen, false, &elems);
3253
3254                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3255                 if (elems.tim && !elems.parse_error) {
3256                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3257                         ifmgd->dtim_period = tim_ie->dtim_period;
3258                 }
3259                 ifmgd->have_beacon = true;
3260                 ifmgd->assoc_data->need_beacon = false;
3261                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3262                         sdata->vif.bss_conf.sync_tsf =
3263                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3264                         sdata->vif.bss_conf.sync_device_ts =
3265                                 rx_status->device_timestamp;
3266                         if (elems.tim)
3267                                 sdata->vif.bss_conf.sync_dtim_count =
3268                                         elems.tim->dtim_count;
3269                         else
3270                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3271                 }
3272                 /* continue assoc process */
3273                 ifmgd->assoc_data->timeout = jiffies;
3274                 ifmgd->assoc_data->timeout_started = true;
3275                 run_again(sdata, ifmgd->assoc_data->timeout);
3276                 return;
3277         }
3278
3279         if (!ifmgd->associated ||
3280             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3281                 return;
3282         bssid = ifmgd->associated->bssid;
3283
3284         /* Track average RSSI from the Beacon frames of the current AP */
3285         ifmgd->last_beacon_signal = rx_status->signal;
3286         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3287                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3288                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3289                 ifmgd->last_cqm_event_signal = 0;
3290                 ifmgd->count_beacon_signal = 1;
3291                 ifmgd->last_ave_beacon_signal = 0;
3292         } else {
3293                 ifmgd->ave_beacon_signal =
3294                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3295                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3296                          ifmgd->ave_beacon_signal) / 16;
3297                 ifmgd->count_beacon_signal++;
3298         }
3299
3300         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3301             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3302                 int sig = ifmgd->ave_beacon_signal;
3303                 int last_sig = ifmgd->last_ave_beacon_signal;
3304
3305                 /*
3306                  * if signal crosses either of the boundaries, invoke callback
3307                  * with appropriate parameters
3308                  */
3309                 if (sig > ifmgd->rssi_max_thold &&
3310                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3311                         ifmgd->last_ave_beacon_signal = sig;
3312                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3313                 } else if (sig < ifmgd->rssi_min_thold &&
3314                            (last_sig >= ifmgd->rssi_max_thold ||
3315                            last_sig == 0)) {
3316                         ifmgd->last_ave_beacon_signal = sig;
3317                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3318                 }
3319         }
3320
3321         if (bss_conf->cqm_rssi_thold &&
3322             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3323             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3324                 int sig = ifmgd->ave_beacon_signal / 16;
3325                 int last_event = ifmgd->last_cqm_event_signal;
3326                 int thold = bss_conf->cqm_rssi_thold;
3327                 int hyst = bss_conf->cqm_rssi_hyst;
3328                 if (sig < thold &&
3329                     (last_event == 0 || sig < last_event - hyst)) {
3330                         ifmgd->last_cqm_event_signal = sig;
3331                         ieee80211_cqm_rssi_notify(
3332                                 &sdata->vif,
3333                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3334                                 GFP_KERNEL);
3335                 } else if (sig > thold &&
3336                            (last_event == 0 || sig > last_event + hyst)) {
3337                         ifmgd->last_cqm_event_signal = sig;
3338                         ieee80211_cqm_rssi_notify(
3339                                 &sdata->vif,
3340                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3341                                 GFP_KERNEL);
3342                 }
3343         }
3344
3345         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3346                 mlme_dbg_ratelimited(sdata,
3347                                      "cancelling AP probe due to a received beacon\n");
3348                 ieee80211_reset_ap_probe(sdata);
3349         }
3350
3351         /*
3352          * Push the beacon loss detection into the future since
3353          * we are processing a beacon from the AP just now.
3354          */
3355         ieee80211_sta_reset_beacon_monitor(sdata);
3356
3357         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3358         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3359                                           len - baselen, false, &elems,
3360                                           care_about_ies, ncrc);
3361
3362         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3363                 bool directed_tim = ieee80211_check_tim(elems.tim,
3364                                                         elems.tim_len,
3365                                                         ifmgd->aid);
3366                 if (directed_tim) {
3367                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3368                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3369                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3370                                         ieee80211_hw_config(local,
3371                                                             IEEE80211_CONF_CHANGE_PS);
3372                                 }
3373                                 ieee80211_send_nullfunc(local, sdata, 0);
3374                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3375                                 local->pspolling = true;
3376
3377                                 /*
3378                                  * Here is assumed that the driver will be
3379                                  * able to send ps-poll frame and receive a
3380                                  * response even though power save mode is
3381                                  * enabled, but some drivers might require
3382                                  * to disable power save here. This needs
3383                                  * to be investigated.
3384                                  */
3385                                 ieee80211_send_pspoll(local, sdata);
3386                         }
3387                 }
3388         }
3389
3390         if (sdata->vif.p2p) {
3391                 struct ieee80211_p2p_noa_attr noa = {};
3392                 int ret;
3393
3394                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3395                                             len - baselen,
3396                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3397                                             (u8 *) &noa, sizeof(noa));
3398                 if (ret >= 2) {
3399                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3400                                 /* valid noa_attr and index changed */
3401                                 sdata->u.mgd.p2p_noa_index = noa.index;
3402                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3403                                 changed |= BSS_CHANGED_P2P_PS;
3404                                 /*
3405                                  * make sure we update all information, the CRC
3406                                  * mechanism doesn't look at P2P attributes.
3407                                  */
3408                                 ifmgd->beacon_crc_valid = false;
3409                         }
3410                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3411                         /* noa_attr not found and we had valid noa_attr before */
3412                         sdata->u.mgd.p2p_noa_index = -1;
3413                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3414                         changed |= BSS_CHANGED_P2P_PS;
3415                         ifmgd->beacon_crc_valid = false;
3416                 }
3417         }
3418
3419         if (ifmgd->csa_waiting_bcn)
3420                 ieee80211_chswitch_post_beacon(sdata);
3421
3422         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3423                 return;
3424         ifmgd->beacon_crc = ncrc;
3425         ifmgd->beacon_crc_valid = true;
3426
3427         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3428
3429         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3430                                          rx_status->device_timestamp,
3431                                          &elems, true);
3432
3433         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3434             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3435                                      elems.wmm_param_len))
3436                 changed |= BSS_CHANGED_QOS;
3437
3438         /*
3439          * If we haven't had a beacon before, tell the driver about the
3440          * DTIM period (and beacon timing if desired) now.
3441          */
3442         if (!ifmgd->have_beacon) {
3443                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3444                 if (elems.tim)
3445                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3446                 else
3447                         bss_conf->dtim_period = 1;
3448
3449                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3450                         sdata->vif.bss_conf.sync_tsf =
3451                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3452                         sdata->vif.bss_conf.sync_device_ts =
3453                                 rx_status->device_timestamp;
3454                         if (elems.tim)
3455                                 sdata->vif.bss_conf.sync_dtim_count =
3456                                         elems.tim->dtim_count;
3457                         else
3458                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3459                 }
3460
3461                 changed |= BSS_CHANGED_BEACON_INFO;
3462                 ifmgd->have_beacon = true;
3463
3464                 mutex_lock(&local->iflist_mtx);
3465                 ieee80211_recalc_ps(local, -1);
3466                 mutex_unlock(&local->iflist_mtx);
3467
3468                 ieee80211_recalc_ps_vif(sdata);
3469         }
3470
3471         if (elems.erp_info) {
3472                 erp_valid = true;
3473                 erp_value = elems.erp_info[0];
3474         } else {
3475                 erp_valid = false;
3476         }
3477         changed |= ieee80211_handle_bss_capability(sdata,
3478                         le16_to_cpu(mgmt->u.beacon.capab_info),
3479                         erp_valid, erp_value);
3480
3481         mutex_lock(&local->sta_mtx);
3482         sta = sta_info_get(sdata, bssid);
3483
3484         if (ieee80211_config_bw(sdata, sta,
3485                                 elems.ht_cap_elem, elems.ht_operation,
3486                                 elems.vht_operation, bssid, &changed)) {
3487                 mutex_unlock(&local->sta_mtx);
3488                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3489                                        WLAN_REASON_DEAUTH_LEAVING,
3490                                        true, deauth_buf);
3491                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3492                                       sizeof(deauth_buf));
3493                 return;
3494         }
3495
3496         if (sta && elems.opmode_notif)
3497                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3498                                             rx_status->band, true);
3499         mutex_unlock(&local->sta_mtx);
3500
3501         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3502                                                elems.country_elem,
3503                                                elems.country_elem_len,
3504                                                elems.pwr_constr_elem,
3505                                                elems.cisco_dtpc_elem);
3506
3507         ieee80211_bss_info_change_notify(sdata, changed);
3508 }
3509
3510 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3511                                   struct sk_buff *skb)
3512 {
3513         struct ieee80211_rx_status *rx_status;
3514         struct ieee80211_mgmt *mgmt;
3515         u16 fc;
3516         struct ieee802_11_elems elems;
3517         int ies_len;
3518
3519         rx_status = (struct ieee80211_rx_status *) skb->cb;
3520         mgmt = (struct ieee80211_mgmt *) skb->data;
3521         fc = le16_to_cpu(mgmt->frame_control);
3522
3523         sdata_lock(sdata);
3524
3525         switch (fc & IEEE80211_FCTL_STYPE) {
3526         case IEEE80211_STYPE_BEACON:
3527                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3528                 break;
3529         case IEEE80211_STYPE_PROBE_RESP:
3530                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3531                 break;
3532         case IEEE80211_STYPE_AUTH:
3533                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3534                 break;
3535         case IEEE80211_STYPE_DEAUTH:
3536                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3537                 break;
3538         case IEEE80211_STYPE_DISASSOC:
3539                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3540                 break;
3541         case IEEE80211_STYPE_ASSOC_RESP:
3542         case IEEE80211_STYPE_REASSOC_RESP:
3543                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3544                 break;
3545         case IEEE80211_STYPE_ACTION:
3546                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3547                         ies_len = skb->len -
3548                                   offsetof(struct ieee80211_mgmt,
3549                                            u.action.u.chan_switch.variable);
3550
3551                         if (ies_len < 0)
3552                                 break;
3553
3554                         ieee802_11_parse_elems(
3555                                 mgmt->u.action.u.chan_switch.variable,
3556                                 ies_len, true, &elems);
3557
3558                         if (elems.parse_error)
3559                                 break;
3560
3561                         ieee80211_sta_process_chanswitch(sdata,
3562                                                  rx_status->mactime,
3563                                                  rx_status->device_timestamp,
3564                                                  &elems, false);
3565                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3566                         ies_len = skb->len -
3567                                   offsetof(struct ieee80211_mgmt,
3568                                            u.action.u.ext_chan_switch.variable);
3569
3570                         if (ies_len < 0)
3571                                 break;
3572
3573                         ieee802_11_parse_elems(
3574                                 mgmt->u.action.u.ext_chan_switch.variable,
3575                                 ies_len, true, &elems);
3576
3577                         if (elems.parse_error)
3578                                 break;
3579
3580                         /* for the handling code pretend this was also an IE */
3581                         elems.ext_chansw_ie =
3582                                 &mgmt->u.action.u.ext_chan_switch.data;
3583
3584                         ieee80211_sta_process_chanswitch(sdata,
3585                                                  rx_status->mactime,
3586                                                  rx_status->device_timestamp,
3587                                                  &elems, false);
3588                 }
3589                 break;
3590         }
3591         sdata_unlock(sdata);
3592 }
3593
3594 static void ieee80211_sta_timer(unsigned long data)
3595 {
3596         struct ieee80211_sub_if_data *sdata =
3597                 (struct ieee80211_sub_if_data *) data;
3598
3599         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3600 }
3601
3602 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3603                                           u8 *bssid, u8 reason, bool tx)
3604 {
3605         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3606
3607         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3608                                tx, frame_buf);
3609
3610         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3611                               IEEE80211_DEAUTH_FRAME_LEN);
3612 }
3613
3614 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3615 {
3616         struct ieee80211_local *local = sdata->local;
3617         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3618         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3619         u32 tx_flags = 0;
3620
3621         sdata_assert_lock(sdata);
3622
3623         if (WARN_ON_ONCE(!auth_data))
3624                 return -EINVAL;
3625
3626         auth_data->tries++;
3627
3628         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3629                 sdata_info(sdata, "authentication with %pM timed out\n",
3630                            auth_data->bss->bssid);
3631
3632                 /*
3633                  * Most likely AP is not in the range so remove the
3634                  * bss struct for that AP.
3635                  */
3636                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3637
3638                 return -ETIMEDOUT;
3639         }
3640
3641         drv_mgd_prepare_tx(local, sdata);
3642
3643         if (auth_data->bss->proberesp_ies) {
3644                 u16 trans = 1;
3645                 u16 status = 0;
3646
3647                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3648                            auth_data->bss->bssid, auth_data->tries,
3649                            IEEE80211_AUTH_MAX_TRIES);
3650
3651                 auth_data->expected_transaction = 2;
3652
3653                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3654                         trans = auth_data->sae_trans;
3655                         status = auth_data->sae_status;
3656                         auth_data->expected_transaction = trans;
3657                 }
3658
3659                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3660                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3661                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3662
3663                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3664                                     auth_data->data, auth_data->data_len,
3665                                     auth_data->bss->bssid,
3666                                     auth_data->bss->bssid, NULL, 0, 0,
3667                                     tx_flags);
3668         } else {
3669                 const u8 *ssidie;
3670
3671                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3672                            auth_data->bss->bssid, auth_data->tries,
3673                            IEEE80211_AUTH_MAX_TRIES);
3674
3675                 rcu_read_lock();
3676                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3677                 if (!ssidie) {
3678                         rcu_read_unlock();
3679                         return -EINVAL;
3680                 }
3681                 /*
3682                  * Direct probe is sent to broadcast address as some APs
3683                  * will not answer to direct packet in unassociated state.
3684                  */
3685                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
3686                                          ssidie + 2, ssidie[1],
3687                                          NULL, 0, (u32) -1, true, 0,
3688                                          auth_data->bss->channel, false);
3689                 rcu_read_unlock();
3690         }
3691
3692         if (tx_flags == 0) {
3693                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3694                 auth_data->timeout_started = true;
3695                 run_again(sdata, auth_data->timeout);
3696         } else {
3697                 auth_data->timeout =
3698                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3699                 auth_data->timeout_started = true;
3700                 run_again(sdata, auth_data->timeout);
3701         }
3702
3703         return 0;
3704 }
3705
3706 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3707 {
3708         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3709         struct ieee80211_local *local = sdata->local;
3710
3711         sdata_assert_lock(sdata);
3712
3713         assoc_data->tries++;
3714         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3715                 sdata_info(sdata, "association with %pM timed out\n",
3716                            assoc_data->bss->bssid);
3717
3718                 /*
3719                  * Most likely AP is not in the range so remove the
3720                  * bss struct for that AP.
3721                  */
3722                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3723
3724                 return -ETIMEDOUT;
3725         }
3726
3727         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3728                    assoc_data->bss->bssid, assoc_data->tries,
3729                    IEEE80211_ASSOC_MAX_TRIES);
3730         ieee80211_send_assoc(sdata);
3731
3732         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3733                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3734                 assoc_data->timeout_started = true;
3735                 run_again(sdata, assoc_data->timeout);
3736         } else {
3737                 assoc_data->timeout =
3738                         round_jiffies_up(jiffies +
3739                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3740                 assoc_data->timeout_started = true;
3741                 run_again(sdata, assoc_data->timeout);
3742         }
3743
3744         return 0;
3745 }
3746
3747 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3748                                   __le16 fc, bool acked)
3749 {
3750         struct ieee80211_local *local = sdata->local;
3751
3752         sdata->u.mgd.status_fc = fc;
3753         sdata->u.mgd.status_acked = acked;
3754         sdata->u.mgd.status_received = true;
3755
3756         ieee80211_queue_work(&local->hw, &sdata->work);
3757 }
3758
3759 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3760 {
3761         struct ieee80211_local *local = sdata->local;
3762         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3763
3764         sdata_lock(sdata);
3765
3766         if (ifmgd->status_received) {
3767                 __le16 fc = ifmgd->status_fc;
3768                 bool status_acked = ifmgd->status_acked;
3769
3770                 ifmgd->status_received = false;
3771                 if (ifmgd->auth_data &&
3772                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3773                         if (status_acked) {
3774                                 ifmgd->auth_data->timeout =
3775                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3776                                 run_again(sdata, ifmgd->auth_data->timeout);
3777                         } else {
3778                                 ifmgd->auth_data->timeout = jiffies - 1;
3779                         }
3780                         ifmgd->auth_data->timeout_started = true;
3781                 } else if (ifmgd->assoc_data &&
3782                            (ieee80211_is_assoc_req(fc) ||
3783                             ieee80211_is_reassoc_req(fc))) {
3784                         if (status_acked) {
3785                                 ifmgd->assoc_data->timeout =
3786                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3787                                 run_again(sdata, ifmgd->assoc_data->timeout);
3788                         } else {
3789                                 ifmgd->assoc_data->timeout = jiffies - 1;
3790                         }
3791                         ifmgd->assoc_data->timeout_started = true;
3792                 }
3793         }
3794
3795         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3796             time_after(jiffies, ifmgd->auth_data->timeout)) {
3797                 if (ifmgd->auth_data->done) {
3798                         /*
3799                          * ok ... we waited for assoc but userspace didn't,
3800                          * so let's just kill the auth data
3801                          */
3802                         ieee80211_destroy_auth_data(sdata, false);
3803                 } else if (ieee80211_probe_auth(sdata)) {
3804                         u8 bssid[ETH_ALEN];
3805
3806                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3807
3808                         ieee80211_destroy_auth_data(sdata, false);
3809
3810                         cfg80211_auth_timeout(sdata->dev, bssid);
3811                 }
3812         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3813                 run_again(sdata, ifmgd->auth_data->timeout);
3814
3815         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3816             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3817                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3818                     ieee80211_do_assoc(sdata)) {
3819                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3820
3821                         ieee80211_destroy_assoc_data(sdata, false);
3822                         cfg80211_assoc_timeout(sdata->dev, bss);
3823                 }
3824         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3825                 run_again(sdata, ifmgd->assoc_data->timeout);
3826
3827         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3828             ifmgd->associated) {
3829                 u8 bssid[ETH_ALEN];
3830                 int max_tries;
3831
3832                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3833
3834                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3835                         max_tries = max_nullfunc_tries;
3836                 else
3837                         max_tries = max_probe_tries;
3838
3839                 /* ACK received for nullfunc probing frame */
3840                 if (!ifmgd->probe_send_count)
3841                         ieee80211_reset_ap_probe(sdata);
3842                 else if (ifmgd->nullfunc_failed) {
3843                         if (ifmgd->probe_send_count < max_tries) {
3844                                 mlme_dbg(sdata,
3845                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3846                                          bssid, ifmgd->probe_send_count,
3847                                          max_tries);
3848                                 ieee80211_mgd_probe_ap_send(sdata);
3849                         } else {
3850                                 mlme_dbg(sdata,
3851                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3852                                          bssid);
3853                                 ieee80211_sta_connection_lost(sdata, bssid,
3854                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3855                                         false);
3856                         }
3857                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3858                         run_again(sdata, ifmgd->probe_timeout);
3859                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3860                         mlme_dbg(sdata,
3861                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3862                                  bssid, probe_wait_ms);
3863                         ieee80211_sta_connection_lost(sdata, bssid,
3864                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3865                 } else if (ifmgd->probe_send_count < max_tries) {
3866                         mlme_dbg(sdata,
3867                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3868                                  bssid, probe_wait_ms,
3869                                  ifmgd->probe_send_count, max_tries);
3870                         ieee80211_mgd_probe_ap_send(sdata);
3871                 } else {
3872                         /*
3873                          * We actually lost the connection ... or did we?
3874                          * Let's make sure!
3875                          */
3876                         wiphy_debug(local->hw.wiphy,
3877                                     "%s: No probe response from AP %pM"
3878                                     " after %dms, disconnecting.\n",
3879                                     sdata->name,
3880                                     bssid, probe_wait_ms);
3881
3882                         ieee80211_sta_connection_lost(sdata, bssid,
3883                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3884                 }
3885         }
3886
3887         sdata_unlock(sdata);
3888 }
3889
3890 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3891 {
3892         struct ieee80211_sub_if_data *sdata =
3893                 (struct ieee80211_sub_if_data *) data;
3894         struct ieee80211_local *local = sdata->local;
3895         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3896
3897         if (local->quiescing)
3898                 return;
3899
3900         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3901                 return;
3902
3903         sdata->u.mgd.connection_loss = false;
3904         ieee80211_queue_work(&sdata->local->hw,
3905                              &sdata->u.mgd.beacon_connection_loss_work);
3906 }
3907
3908 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3909 {
3910         struct ieee80211_sub_if_data *sdata =
3911                 (struct ieee80211_sub_if_data *) data;
3912         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3913         struct ieee80211_local *local = sdata->local;
3914
3915         if (local->quiescing)
3916                 return;
3917
3918         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3919                 return;
3920
3921         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3922 }
3923
3924 static void ieee80211_sta_monitor_work(struct work_struct *work)
3925 {
3926         struct ieee80211_sub_if_data *sdata =
3927                 container_of(work, struct ieee80211_sub_if_data,
3928                              u.mgd.monitor_work);
3929
3930         ieee80211_mgd_probe_ap(sdata, false);
3931 }
3932
3933 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3934 {
3935         u32 flags;
3936
3937         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3938                 __ieee80211_stop_poll(sdata);
3939
3940                 /* let's probe the connection once */
3941                 flags = sdata->local->hw.flags;
3942                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3943                         ieee80211_queue_work(&sdata->local->hw,
3944                                              &sdata->u.mgd.monitor_work);
3945                 /* and do all the other regular work too */
3946                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3947         }
3948 }
3949
3950 #ifdef CONFIG_PM
3951 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3952 {
3953         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3954         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3955
3956         sdata_lock(sdata);
3957
3958         if (ifmgd->auth_data || ifmgd->assoc_data) {
3959                 const u8 *bssid = ifmgd->auth_data ?
3960                                 ifmgd->auth_data->bss->bssid :
3961                                 ifmgd->assoc_data->bss->bssid;
3962
3963                 /*
3964                  * If we are trying to authenticate / associate while suspending,
3965                  * cfg80211 won't know and won't actually abort those attempts,
3966                  * thus we need to do that ourselves.
3967                  */
3968                 ieee80211_send_deauth_disassoc(sdata, bssid,
3969                                                IEEE80211_STYPE_DEAUTH,
3970                                                WLAN_REASON_DEAUTH_LEAVING,
3971                                                false, frame_buf);
3972                 if (ifmgd->assoc_data)
3973                         ieee80211_destroy_assoc_data(sdata, false);
3974                 if (ifmgd->auth_data)
3975                         ieee80211_destroy_auth_data(sdata, false);
3976                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3977                                       IEEE80211_DEAUTH_FRAME_LEN);
3978         }
3979
3980         sdata_unlock(sdata);
3981 }
3982
3983 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3984 {
3985         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3986
3987         sdata_lock(sdata);
3988         if (!ifmgd->associated) {
3989                 sdata_unlock(sdata);
3990                 return;
3991         }
3992
3993         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3994                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3995                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3996                 ieee80211_sta_connection_lost(sdata,
3997                                               ifmgd->associated->bssid,
3998                                               WLAN_REASON_UNSPECIFIED,
3999                                               true);
4000                 sdata_unlock(sdata);
4001                 return;
4002         }
4003         sdata_unlock(sdata);
4004 }
4005 #endif
4006
4007 /* interface setup */
4008 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4009 {
4010         struct ieee80211_if_managed *ifmgd;
4011
4012         ifmgd = &sdata->u.mgd;
4013         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4014         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4015         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4016                   ieee80211_beacon_connection_loss_work);
4017         INIT_WORK(&ifmgd->csa_connection_drop_work,
4018                   ieee80211_csa_connection_drop_work);
4019         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4020         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4021                           ieee80211_tdls_peer_del_work);
4022         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4023                     (unsigned long) sdata);
4024         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4025                     (unsigned long) sdata);
4026         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4027                     (unsigned long) sdata);
4028         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4029                     (unsigned long) sdata);
4030         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4031                           ieee80211_sta_handle_tspec_ac_params_wk);
4032
4033         ifmgd->flags = 0;
4034         ifmgd->powersave = sdata->wdev.ps;
4035         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4036         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4037         ifmgd->p2p_noa_index = -1;
4038
4039         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4040                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4041         else
4042                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4043
4044         /* Setup TDLS data */
4045         spin_lock_init(&ifmgd->teardown_lock);
4046         ifmgd->teardown_skb = NULL;
4047         ifmgd->orig_teardown_skb = NULL;
4048 }
4049
4050 /* scan finished notification */
4051 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4052 {
4053         struct ieee80211_sub_if_data *sdata;
4054
4055         /* Restart STA timers */
4056         rcu_read_lock();
4057         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4058                 if (ieee80211_sdata_running(sdata))
4059                         ieee80211_restart_sta_timer(sdata);
4060         }
4061         rcu_read_unlock();
4062 }
4063
4064 int ieee80211_max_network_latency(struct notifier_block *nb,
4065                                   unsigned long data, void *dummy)
4066 {
4067         s32 latency_usec = (s32) data;
4068         struct ieee80211_local *local =
4069                 container_of(nb, struct ieee80211_local,
4070                              network_latency_notifier);
4071
4072         mutex_lock(&local->iflist_mtx);
4073         ieee80211_recalc_ps(local, latency_usec);
4074         mutex_unlock(&local->iflist_mtx);
4075
4076         return NOTIFY_OK;
4077 }
4078
4079 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4080                                      struct cfg80211_bss *cbss)
4081 {
4082         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4083         const u8 *ht_cap_ie, *vht_cap_ie;
4084         const struct ieee80211_ht_cap *ht_cap;
4085         const struct ieee80211_vht_cap *vht_cap;
4086         u8 chains = 1;
4087
4088         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4089                 return chains;
4090
4091         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4092         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4093                 ht_cap = (void *)(ht_cap_ie + 2);
4094                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4095                 /*
4096                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4097                  *       "Tx Unequal Modulation Supported" fields.
4098                  */
4099         }
4100
4101         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4102                 return chains;
4103
4104         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4105         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4106                 u8 nss;
4107                 u16 tx_mcs_map;
4108
4109                 vht_cap = (void *)(vht_cap_ie + 2);
4110                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4111                 for (nss = 8; nss > 0; nss--) {
4112                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4113                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4114                                 break;
4115                 }
4116                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4117                 chains = max(chains, nss);
4118         }
4119
4120         return chains;
4121 }
4122
4123 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4124                                   struct cfg80211_bss *cbss)
4125 {
4126         struct ieee80211_local *local = sdata->local;
4127         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4128         const struct ieee80211_ht_cap *ht_cap = NULL;
4129         const struct ieee80211_ht_operation *ht_oper = NULL;
4130         const struct ieee80211_vht_operation *vht_oper = NULL;
4131         struct ieee80211_supported_band *sband;
4132         struct cfg80211_chan_def chandef;
4133         int ret;
4134
4135         sband = local->hw.wiphy->bands[cbss->channel->band];
4136
4137         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4138                           IEEE80211_STA_DISABLE_80P80MHZ |
4139                           IEEE80211_STA_DISABLE_160MHZ);
4140
4141         rcu_read_lock();
4142
4143         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4144             sband->ht_cap.ht_supported) {
4145                 const u8 *ht_oper_ie, *ht_cap_ie;
4146
4147                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4148                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4149                         ht_oper = (void *)(ht_oper_ie + 2);
4150
4151                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4152                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4153                         ht_cap = (void *)(ht_cap_ie + 2);
4154
4155                 if (!ht_cap) {
4156                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4157                         ht_oper = NULL;
4158                 }
4159         }
4160
4161         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4162             sband->vht_cap.vht_supported) {
4163                 const u8 *vht_oper_ie, *vht_cap;
4164
4165                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4166                                                    WLAN_EID_VHT_OPERATION);
4167                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4168                         vht_oper = (void *)(vht_oper_ie + 2);
4169                 if (vht_oper && !ht_oper) {
4170                         vht_oper = NULL;
4171                         sdata_info(sdata,
4172                                    "AP advertised VHT without HT, disabling both\n");
4173                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4174                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4175                 }
4176
4177                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4178                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4179                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4180                         vht_oper = NULL;
4181                 }
4182         }
4183
4184         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4185                                                      cbss->channel,
4186                                                      ht_cap, ht_oper, vht_oper,
4187                                                      &chandef, false);
4188
4189         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4190                                       local->rx_chains);
4191
4192         rcu_read_unlock();
4193
4194         /* will change later if needed */
4195         sdata->smps_mode = IEEE80211_SMPS_OFF;
4196
4197         mutex_lock(&local->mtx);
4198         /*
4199          * If this fails (possibly due to channel context sharing
4200          * on incompatible channels, e.g. 80+80 and 160 sharing the
4201          * same control channel) try to use a smaller bandwidth.
4202          */
4203         ret = ieee80211_vif_use_channel(sdata, &chandef,
4204                                         IEEE80211_CHANCTX_SHARED);
4205
4206         /* don't downgrade for 5 and 10 MHz channels, though. */
4207         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4208             chandef.width == NL80211_CHAN_WIDTH_10)
4209                 goto out;
4210
4211         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4212                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4213                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4214                                                 IEEE80211_CHANCTX_SHARED);
4215         }
4216  out:
4217         mutex_unlock(&local->mtx);
4218         return ret;
4219 }
4220
4221 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4222                                      struct cfg80211_bss *cbss, bool assoc)
4223 {
4224         struct ieee80211_local *local = sdata->local;
4225         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4226         struct ieee80211_bss *bss = (void *)cbss->priv;
4227         struct sta_info *new_sta = NULL;
4228         struct ieee80211_supported_band *sband;
4229         struct ieee80211_sta_ht_cap sta_ht_cap;
4230         bool have_sta = false, is_override = false;
4231         int err;
4232
4233         sband = local->hw.wiphy->bands[cbss->channel->band];
4234
4235         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4236                 return -EINVAL;
4237
4238         if (assoc) {
4239                 rcu_read_lock();
4240                 have_sta = sta_info_get(sdata, cbss->bssid);
4241                 rcu_read_unlock();
4242         }
4243
4244         if (!have_sta) {
4245                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4246                 if (!new_sta)
4247                         return -ENOMEM;
4248         }
4249
4250         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4251         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4252
4253         is_override = (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) !=
4254                       (sband->ht_cap.cap &
4255                        IEEE80211_HT_CAP_SUP_WIDTH_20_40);
4256
4257         if (new_sta || is_override) {
4258                 err = ieee80211_prep_channel(sdata, cbss);
4259                 if (err) {
4260                         if (new_sta)
4261                                 sta_info_free(local, new_sta);
4262                         return -EINVAL;
4263                 }
4264         }
4265
4266         if (new_sta) {
4267                 u32 rates = 0, basic_rates = 0;
4268                 bool have_higher_than_11mbit;
4269                 int min_rate = INT_MAX, min_rate_index = -1;
4270                 struct ieee80211_chanctx_conf *chanctx_conf;
4271                 const struct cfg80211_bss_ies *ies;
4272                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4273                 u32 rate_flags;
4274
4275                 rcu_read_lock();
4276                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4277                 if (WARN_ON(!chanctx_conf)) {
4278                         rcu_read_unlock();
4279                         sta_info_free(local, new_sta);
4280                         return -EINVAL;
4281                 }
4282                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4283                 rcu_read_unlock();
4284
4285                 ieee80211_get_rates(sband, bss->supp_rates,
4286                                     bss->supp_rates_len,
4287                                     &rates, &basic_rates,
4288                                     &have_higher_than_11mbit,
4289                                     &min_rate, &min_rate_index,
4290                                     shift, rate_flags);
4291
4292                 /*
4293                  * This used to be a workaround for basic rates missing
4294                  * in the association response frame. Now that we no
4295                  * longer use the basic rates from there, it probably
4296                  * doesn't happen any more, but keep the workaround so
4297                  * in case some *other* APs are buggy in different ways
4298                  * we can connect -- with a warning.
4299                  */
4300                 if (!basic_rates && min_rate_index >= 0) {
4301                         sdata_info(sdata,
4302                                    "No basic rates, using min rate instead\n");
4303                         basic_rates = BIT(min_rate_index);
4304                 }
4305
4306                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4307                 sdata->vif.bss_conf.basic_rates = basic_rates;
4308
4309                 /* cf. IEEE 802.11 9.2.12 */
4310                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4311                     have_higher_than_11mbit)
4312                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4313                 else
4314                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4315
4316                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4317
4318                 /* set timing information */
4319                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4320                 rcu_read_lock();
4321                 ies = rcu_dereference(cbss->beacon_ies);
4322                 if (ies) {
4323                         const u8 *tim_ie;
4324
4325                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4326                         sdata->vif.bss_conf.sync_device_ts =
4327                                 bss->device_ts_beacon;
4328                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4329                                                   ies->data, ies->len);
4330                         if (tim_ie && tim_ie[1] >= 2)
4331                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4332                         else
4333                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4334                 } else if (!(local->hw.flags &
4335                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4336                         ies = rcu_dereference(cbss->proberesp_ies);
4337                         /* must be non-NULL since beacon IEs were NULL */
4338                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4339                         sdata->vif.bss_conf.sync_device_ts =
4340                                 bss->device_ts_presp;
4341                         sdata->vif.bss_conf.sync_dtim_count = 0;
4342                 } else {
4343                         sdata->vif.bss_conf.sync_tsf = 0;
4344                         sdata->vif.bss_conf.sync_device_ts = 0;
4345                         sdata->vif.bss_conf.sync_dtim_count = 0;
4346                 }
4347                 rcu_read_unlock();
4348
4349                 /* tell driver about BSSID, basic rates and timing */
4350                 ieee80211_bss_info_change_notify(sdata,
4351                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4352                         BSS_CHANGED_BEACON_INT);
4353
4354                 if (assoc)
4355                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4356
4357                 err = sta_info_insert(new_sta);
4358                 new_sta = NULL;
4359                 if (err) {
4360                         sdata_info(sdata,
4361                                    "failed to insert STA entry for the AP (error %d)\n",
4362                                    err);
4363                         return err;
4364                 }
4365         } else
4366                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4367
4368         return 0;
4369 }
4370
4371 /* config hooks */
4372 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4373                        struct cfg80211_auth_request *req)
4374 {
4375         struct ieee80211_local *local = sdata->local;
4376         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4377         struct ieee80211_mgd_auth_data *auth_data;
4378         u16 auth_alg;
4379         int err;
4380
4381         /* prepare auth data structure */
4382
4383         switch (req->auth_type) {
4384         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4385                 auth_alg = WLAN_AUTH_OPEN;
4386                 break;
4387         case NL80211_AUTHTYPE_SHARED_KEY:
4388                 if (IS_ERR(local->wep_tx_tfm))
4389                         return -EOPNOTSUPP;
4390                 auth_alg = WLAN_AUTH_SHARED_KEY;
4391                 break;
4392         case NL80211_AUTHTYPE_FT:
4393                 auth_alg = WLAN_AUTH_FT;
4394                 break;
4395         case NL80211_AUTHTYPE_NETWORK_EAP:
4396                 auth_alg = WLAN_AUTH_LEAP;
4397                 break;
4398         case NL80211_AUTHTYPE_SAE:
4399                 auth_alg = WLAN_AUTH_SAE;
4400                 break;
4401         default:
4402                 return -EOPNOTSUPP;
4403         }
4404
4405         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4406                             req->ie_len, GFP_KERNEL);
4407         if (!auth_data)
4408                 return -ENOMEM;
4409
4410         auth_data->bss = req->bss;
4411
4412         if (req->sae_data_len >= 4) {
4413                 __le16 *pos = (__le16 *) req->sae_data;
4414                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4415                 auth_data->sae_status = le16_to_cpu(pos[1]);
4416                 memcpy(auth_data->data, req->sae_data + 4,
4417                        req->sae_data_len - 4);
4418                 auth_data->data_len += req->sae_data_len - 4;
4419         }
4420
4421         if (req->ie && req->ie_len) {
4422                 memcpy(&auth_data->data[auth_data->data_len],
4423                        req->ie, req->ie_len);
4424                 auth_data->data_len += req->ie_len;
4425         }
4426
4427         if (req->key && req->key_len) {
4428                 auth_data->key_len = req->key_len;
4429                 auth_data->key_idx = req->key_idx;
4430                 memcpy(auth_data->key, req->key, req->key_len);
4431         }
4432
4433         auth_data->algorithm = auth_alg;
4434
4435         /* try to authenticate/probe */
4436
4437         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4438             ifmgd->assoc_data) {
4439                 err = -EBUSY;
4440                 goto err_free;
4441         }
4442
4443         if (ifmgd->auth_data)
4444                 ieee80211_destroy_auth_data(sdata, false);
4445
4446         /* prep auth_data so we don't go into idle on disassoc */
4447         ifmgd->auth_data = auth_data;
4448
4449         if (ifmgd->associated) {
4450                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4451
4452                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4453                                        WLAN_REASON_UNSPECIFIED,
4454                                        false, frame_buf);
4455
4456                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4457                                       sizeof(frame_buf));
4458         }
4459
4460         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4461
4462         err = ieee80211_prep_connection(sdata, req->bss, false);
4463         if (err)
4464                 goto err_clear;
4465
4466         err = ieee80211_probe_auth(sdata);
4467         if (err) {
4468                 sta_info_destroy_addr(sdata, req->bss->bssid);
4469                 goto err_clear;
4470         }
4471
4472         /* hold our own reference */
4473         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4474         return 0;
4475
4476  err_clear:
4477         memset(ifmgd->bssid, 0, ETH_ALEN);
4478         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4479         ifmgd->auth_data = NULL;
4480  err_free:
4481         kfree(auth_data);
4482         return err;
4483 }
4484
4485 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4486                                         const u8 *wmm_param, int len)
4487 {
4488         const u8 *pos;
4489         size_t left;
4490
4491         if (len < 8)
4492                 return false;
4493
4494         if (wmm_param[5] != 1 /* version */)
4495                 return false;
4496
4497         pos = wmm_param + 8;
4498         left = len - 8;
4499
4500         for (; left >= 4; left -= 4, pos += 4) {
4501                 u8 aifsn = pos[0] & 0x0f;
4502                 u8 ecwmin = pos[1] & 0x0f;
4503                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4504                 int aci = (pos[0] >> 5) & 0x03;
4505
4506                 if (aifsn < 2) {
4507                         sdata_info(sdata,
4508                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4509                                    aifsn, aci);
4510                         return false;
4511                 }
4512                 if (ecwmin > ecwmax) {
4513                         sdata_info(sdata,
4514                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4515                                    ecwmin, ecwmax, aci);
4516                         return false;
4517                 }
4518         }
4519
4520         return true;
4521 }
4522
4523 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4524                         struct cfg80211_assoc_request *req)
4525 {
4526         struct ieee80211_local *local = sdata->local;
4527         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4528         struct ieee80211_bss *bss = (void *)req->bss->priv;
4529         struct ieee80211_mgd_assoc_data *assoc_data;
4530         const struct cfg80211_bss_ies *beacon_ies;
4531         struct ieee80211_supported_band *sband;
4532         const u8 *ssidie, *ht_ie, *vht_ie;
4533         int i, err;
4534
4535         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4536         if (!assoc_data)
4537                 return -ENOMEM;
4538
4539         rcu_read_lock();
4540         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4541         if (!ssidie) {
4542                 rcu_read_unlock();
4543                 kfree(assoc_data);
4544                 return -EINVAL;
4545         }
4546         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4547         assoc_data->ssid_len = ssidie[1];
4548         rcu_read_unlock();
4549
4550         if (ifmgd->associated) {
4551                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4552
4553                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4554                                        WLAN_REASON_UNSPECIFIED,
4555                                        false, frame_buf);
4556
4557                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4558                                       sizeof(frame_buf));
4559         }
4560
4561         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4562                 err = -EBUSY;
4563                 goto err_free;
4564         }
4565
4566         if (ifmgd->assoc_data) {
4567                 err = -EBUSY;
4568                 goto err_free;
4569         }
4570
4571         if (ifmgd->auth_data) {
4572                 bool match;
4573
4574                 /* keep sta info, bssid if matching */
4575                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4576                 ieee80211_destroy_auth_data(sdata, match);
4577         }
4578
4579         /* prepare assoc data */
4580
4581         ifmgd->beacon_crc_valid = false;
4582
4583         assoc_data->wmm = bss->wmm_used &&
4584                           (local->hw.queues >= IEEE80211_NUM_ACS);
4585         if (assoc_data->wmm) {
4586                 /* try to check validity of WMM params IE */
4587                 const struct cfg80211_bss_ies *ies;
4588                 const u8 *wp, *start, *end;
4589
4590                 rcu_read_lock();
4591                 ies = rcu_dereference(req->bss->ies);
4592                 start = ies->data;
4593                 end = start + ies->len;
4594
4595                 while (true) {
4596                         wp = cfg80211_find_vendor_ie(
4597                                 WLAN_OUI_MICROSOFT,
4598                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4599                                 start, end - start);
4600                         if (!wp)
4601                                 break;
4602                         start = wp + wp[1] + 2;
4603                         /* if this IE is too short, try the next */
4604                         if (wp[1] <= 4)
4605                                 continue;
4606                         /* if this IE is WMM params, we found what we wanted */
4607                         if (wp[6] == 1)
4608                                 break;
4609                 }
4610
4611                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4612                                                         wp[1] - 2)) {
4613                         assoc_data->wmm = false;
4614                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4615                 }
4616                 rcu_read_unlock();
4617         }
4618
4619         /*
4620          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4621          * We still associate in non-HT mode (11a/b/g) if any one of these
4622          * ciphers is configured as pairwise.
4623          * We can set this to true for non-11n hardware, that'll be checked
4624          * separately along with the peer capabilities.
4625          */
4626         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4627                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4628                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4629                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4630                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4631                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4632                         netdev_info(sdata->dev,
4633                                     "disabling HT/VHT due to WEP/TKIP use\n");
4634                 }
4635         }
4636
4637         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4638                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4639                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4640         }
4641
4642         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4643                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4644
4645         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4646         sband = local->hw.wiphy->bands[req->bss->channel->band];
4647         if (!sband->ht_cap.ht_supported ||
4648             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4649             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4650                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4651                 if (!bss->wmm_used &&
4652                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4653                         netdev_info(sdata->dev,
4654                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4655         }
4656
4657         /* disable VHT if we don't support it or the AP doesn't use WMM */
4658         if (!sband->vht_cap.vht_supported ||
4659             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4660             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4661                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4662                 if (!bss->wmm_used &&
4663                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4664                         netdev_info(sdata->dev,
4665                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4666         }
4667
4668         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4669         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4670                sizeof(ifmgd->ht_capa_mask));
4671
4672         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4673         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4674                sizeof(ifmgd->vht_capa_mask));
4675
4676         if (req->ie && req->ie_len) {
4677                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4678                 assoc_data->ie_len = req->ie_len;
4679         }
4680
4681         assoc_data->bss = req->bss;
4682
4683         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4684                 if (ifmgd->powersave)
4685                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4686                 else
4687                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4688         } else
4689                 sdata->smps_mode = ifmgd->req_smps;
4690
4691         assoc_data->capability = req->bss->capability;
4692         assoc_data->supp_rates = bss->supp_rates;
4693         assoc_data->supp_rates_len = bss->supp_rates_len;
4694
4695         rcu_read_lock();
4696         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4697         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4698                 assoc_data->ap_ht_param =
4699                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4700         else
4701                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4702         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4703         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4704                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4705                        sizeof(struct ieee80211_vht_cap));
4706         else
4707                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4708         rcu_read_unlock();
4709
4710         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4711                  (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
4712              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4713                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4714
4715         if (bss->wmm_used && bss->uapsd_supported &&
4716             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4717                 assoc_data->uapsd = true;
4718                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4719         } else {
4720                 assoc_data->uapsd = false;
4721                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4722         }
4723
4724         if (req->prev_bssid)
4725                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4726
4727         if (req->use_mfp) {
4728                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4729                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4730         } else {
4731                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4732                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4733         }
4734
4735         if (req->flags & ASSOC_REQ_USE_RRM)
4736                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4737         else
4738                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4739
4740         if (req->crypto.control_port)
4741                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4742         else
4743                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4744
4745         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4746         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4747         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4748                                                         sdata->vif.type);
4749
4750         /* kick off associate process */
4751
4752         ifmgd->assoc_data = assoc_data;
4753         ifmgd->dtim_period = 0;
4754         ifmgd->have_beacon = false;
4755
4756         err = ieee80211_prep_connection(sdata, req->bss, true);
4757         if (err)
4758                 goto err_clear;
4759
4760         rcu_read_lock();
4761         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4762
4763         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4764             !beacon_ies) {
4765                 /*
4766                  * Wait up to one beacon interval ...
4767                  * should this be more if we miss one?
4768                  */
4769                 sdata_info(sdata, "waiting for beacon from %pM\n",
4770                            ifmgd->bssid);
4771                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4772                 assoc_data->timeout_started = true;
4773                 assoc_data->need_beacon = true;
4774         } else if (beacon_ies) {
4775                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4776                                                     beacon_ies->data,
4777                                                     beacon_ies->len);
4778                 u8 dtim_count = 0;
4779
4780                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4781                         const struct ieee80211_tim_ie *tim;
4782                         tim = (void *)(tim_ie + 2);
4783                         ifmgd->dtim_period = tim->dtim_period;
4784                         dtim_count = tim->dtim_count;
4785                 }
4786                 ifmgd->have_beacon = true;
4787                 assoc_data->timeout = jiffies;
4788                 assoc_data->timeout_started = true;
4789
4790                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4791                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4792                         sdata->vif.bss_conf.sync_device_ts =
4793                                 bss->device_ts_beacon;
4794                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4795                 }
4796         } else {
4797                 assoc_data->timeout = jiffies;
4798                 assoc_data->timeout_started = true;
4799         }
4800         rcu_read_unlock();
4801
4802         run_again(sdata, assoc_data->timeout);
4803
4804         if (bss->corrupt_data) {
4805                 char *corrupt_type = "data";
4806                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4807                         if (bss->corrupt_data &
4808                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4809                                 corrupt_type = "beacon and probe response";
4810                         else
4811                                 corrupt_type = "beacon";
4812                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4813                         corrupt_type = "probe response";
4814                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4815                            corrupt_type);
4816         }
4817
4818         return 0;
4819  err_clear:
4820         memset(ifmgd->bssid, 0, ETH_ALEN);
4821         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4822         ifmgd->assoc_data = NULL;
4823  err_free:
4824         kfree(assoc_data);
4825         return err;
4826 }
4827
4828 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4829                          struct cfg80211_deauth_request *req)
4830 {
4831         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4832         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4833         bool tx = !req->local_state_change;
4834
4835         if (ifmgd->auth_data &&
4836             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4837                 sdata_info(sdata,
4838                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4839                            req->bssid, req->reason_code,
4840                            ieee80211_get_reason_code_string(req->reason_code));
4841
4842                 drv_mgd_prepare_tx(sdata->local, sdata);
4843                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4844                                                IEEE80211_STYPE_DEAUTH,
4845                                                req->reason_code, tx,
4846                                                frame_buf);
4847                 ieee80211_destroy_auth_data(sdata, false);
4848                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4849                                       IEEE80211_DEAUTH_FRAME_LEN);
4850
4851                 return 0;
4852         }
4853
4854         if (ifmgd->associated &&
4855             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4856                 sdata_info(sdata,
4857                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4858                            req->bssid, req->reason_code,
4859                            ieee80211_get_reason_code_string(req->reason_code));
4860
4861                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4862                                        req->reason_code, tx, frame_buf);
4863                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4864                                       IEEE80211_DEAUTH_FRAME_LEN);
4865                 return 0;
4866         }
4867
4868         return -ENOTCONN;
4869 }
4870
4871 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4872                            struct cfg80211_disassoc_request *req)
4873 {
4874         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4875         u8 bssid[ETH_ALEN];
4876         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4877
4878         /*
4879          * cfg80211 should catch this ... but it's racy since
4880          * we can receive a disassoc frame, process it, hand it
4881          * to cfg80211 while that's in a locked section already
4882          * trying to tell us that the user wants to disconnect.
4883          */
4884         if (ifmgd->associated != req->bss)
4885                 return -ENOLINK;
4886
4887         sdata_info(sdata,
4888                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4889                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4890
4891         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4892         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4893                                req->reason_code, !req->local_state_change,
4894                                frame_buf);
4895
4896         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4897                               IEEE80211_DEAUTH_FRAME_LEN);
4898
4899         return 0;
4900 }
4901
4902 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4903 {
4904         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4905
4906         /*
4907          * Make sure some work items will not run after this,
4908          * they will not do anything but might not have been
4909          * cancelled when disconnecting.
4910          */
4911         cancel_work_sync(&ifmgd->monitor_work);
4912         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4913         cancel_work_sync(&ifmgd->request_smps_work);
4914         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4915         cancel_work_sync(&ifmgd->chswitch_work);
4916         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4917
4918         sdata_lock(sdata);
4919         if (ifmgd->assoc_data) {
4920                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4921                 ieee80211_destroy_assoc_data(sdata, false);
4922                 cfg80211_assoc_timeout(sdata->dev, bss);
4923         }
4924         if (ifmgd->auth_data)
4925                 ieee80211_destroy_auth_data(sdata, false);
4926         spin_lock_bh(&ifmgd->teardown_lock);
4927         if (ifmgd->teardown_skb) {
4928                 kfree_skb(ifmgd->teardown_skb);
4929                 ifmgd->teardown_skb = NULL;
4930                 ifmgd->orig_teardown_skb = NULL;
4931         }
4932         spin_unlock_bh(&ifmgd->teardown_lock);
4933         del_timer_sync(&ifmgd->timer);
4934         sdata_unlock(sdata);
4935 }
4936
4937 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4938                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4939                                gfp_t gfp)
4940 {
4941         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4942
4943         trace_api_cqm_rssi_notify(sdata, rssi_event);
4944
4945         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4946 }
4947 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
4948
4949 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
4950 {
4951         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4952
4953         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
4954
4955         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
4956 }
4957 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);