net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  34 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  35 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  36 #define IEEE80211_AUTH_MAX_TRIES        3
  37 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  38 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  39 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  40 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  41 #define IEEE80211_ASSOC_MAX_TRIES       3
  42
  43 static int max_nullfunc_tries = 2;
  44 module_param(max_nullfunc_tries, int, 0644);
  45 MODULE_PARM_DESC(max_nullfunc_tries,
  46                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  47
  48 static int max_probe_tries = 5;
  49 module_param(max_probe_tries, int, 0644);
  50 MODULE_PARM_DESC(max_probe_tries,
  51                  "Maximum probe tries before disconnecting (reason 4).");
  52
  53 /*
  54  * Beacon loss timeout is calculated as N frames times the
  55  * advertised beacon interval.  This may need to be somewhat
  56  * higher than what hardware might detect to account for
  57  * delays in the host processing frames. But since we also
  58  * probe on beacon miss before declaring the connection lost
  59  * default to what we want.
  60  */
  61 static int beacon_loss_count = 7;
  62 module_param(beacon_loss_count, int, 0644);
  63 MODULE_PARM_DESC(beacon_loss_count,
  64                  "Number of beacon intervals before we decide beacon was lost.");
  65
  66 /*
  67  * Time the connection can be idle before we probe
  68  * it to see if we can still talk to the AP.
  69  */
  70 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  71 /*
  72  * Time we wait for a probe response after sending
  73  * a probe request because of beacon loss or for
  74  * checking the connection still works.
  75  */
  76 static int probe_wait_ms = 500;
  77 module_param(probe_wait_ms, int, 0644);
  78 MODULE_PARM_DESC(probe_wait_ms,
  79                  "Maximum time(ms) to wait for probe response"
  80                  " before disconnecting (reason 4).");
  81
  82 /*
  83  * Weight given to the latest Beacon frame when calculating average signal
  84  * strength for Beacon frames received in the current BSS. This must be
  85  * between 1 and 15.
  86  */
  87 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  88
  89 /*
  90  * How many Beacon frames need to have been used in average signal strength
  91  * before starting to indicate signal change events.
  92  */
  93 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  94
  95 /*
  96  * We can have multiple work items (and connection probing)
  97  * scheduling this timer, but we need to take care to only
  98  * reschedule it when it should fire _earlier_ than it was
  99  * asked for before, or if it's not pending right now. This
 100  * function ensures that. Note that it then is required to
 101  * run this function for all timeouts after the first one
 102  * has happened -- the work that runs from this timer will
 103  * do that.
 104  */
 105 static void run_again(struct ieee80211_sub_if_data *sdata,
 106                       unsigned long timeout)
 107 {
 108         sdata_assert_lock(sdata);
 109
 110         if (!timer_pending(&sdata->u.mgd.timer) ||
 111             time_before(timeout, sdata->u.mgd.timer.expires))
 112                 mod_timer(&sdata->u.mgd.timer, timeout);
 113 }
 114
 115 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 116 {
 117         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 118                 return;
 119
 120         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 121                 return;
 122
 123         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 124                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 125 }
 126
 127 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 128 {
 129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 130
 131         if (unlikely(!sdata->u.mgd.associated))
 132                 return;
 133
 134         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 135                 return;
 136
 137         mod_timer(&sdata->u.mgd.conn_mon_timer,
 138                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 139
 140         ifmgd->probe_send_count = 0;
 141 }
 142
 143 static int ecw2cw(int ecw)
 144 {
 145         return (1 << ecw) - 1;
 146 }
 147
 148 static u32
 149 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 150                              struct ieee80211_supported_band *sband,
 151                              struct ieee80211_channel *channel,
 152                              const struct ieee80211_ht_operation *ht_oper,
 153                              const struct ieee80211_vht_operation *vht_oper,
 154                              struct cfg80211_chan_def *chandef, bool tracking)
 155 {
 156         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 157         struct cfg80211_chan_def vht_chandef;
 158         u32 ht_cfreq, ret;
 159
 160         chandef->chan = channel;
 161         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 162         chandef->center_freq1 = channel->center_freq;
 163         chandef->center_freq2 = 0;
 164
 165         if (!ht_oper || !sband->ht_cap.ht_supported) {
 166                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 167                 goto out;
 168         }
 169
 170         chandef->width = NL80211_CHAN_WIDTH_20;
 171
 172         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 173                                                   channel->band);
 174         /* check that channel matches the right operating channel */
 175         if (!tracking && channel->center_freq != ht_cfreq) {
 176                 /*
 177                  * It's possible that some APs are confused here;
 178                  * Netgear WNDR3700 sometimes reports 4 higher than
 179                  * the actual channel in association responses, but
 180                  * since we look at probe response/beacon data here
 181                  * it should be OK.
 182                  */
 183                 sdata_info(sdata,
 184                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 185                            channel->center_freq, ht_cfreq,
 186                            ht_oper->primary_chan, channel->band);
 187                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 188                 goto out;
 189         }
 190
 191         /* check 40 MHz support, if we have it */
 192         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 193                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 194                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 195                         chandef->width = NL80211_CHAN_WIDTH_40;
 196                         chandef->center_freq1 += 10;
 197                         break;
 198                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 199                         chandef->width = NL80211_CHAN_WIDTH_40;
 200                         chandef->center_freq1 -= 10;
 201                         break;
 202                 }
 203         } else {
 204                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 205                 ret = IEEE80211_STA_DISABLE_VHT;
 206                 /* also mark 40 MHz disabled */
 207                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 208                 goto out;
 209         }
 210
 211         if (!vht_oper || !sband->vht_cap.vht_supported) {
 212                 ret = IEEE80211_STA_DISABLE_VHT;
 213                 goto out;
 214         }
 215
 216         vht_chandef.chan = channel;
 217         vht_chandef.center_freq1 =
 218                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 219                                                channel->band);
 220         vht_chandef.center_freq2 = 0;
 221
 222         switch (vht_oper->chan_width) {
 223         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 224                 vht_chandef.width = chandef->width;
 225                 vht_chandef.center_freq1 = chandef->center_freq1;
 226                 break;
 227         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 228                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 229                 break;
 230         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 231                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 232                 break;
 233         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 234                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 235                 vht_chandef.center_freq2 =
 236                         ieee80211_channel_to_frequency(
 237                                 vht_oper->center_freq_seg2_idx,
 238                                 channel->band);
 239                 break;
 240         default:
 241                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 242                         sdata_info(sdata,
 243                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 244                                    vht_oper->chan_width);
 245                 ret = IEEE80211_STA_DISABLE_VHT;
 246                 goto out;
 247         }
 248
 249         if (!cfg80211_chandef_valid(&vht_chandef)) {
 250                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 251                         sdata_info(sdata,
 252                                    "AP VHT information is invalid, disable VHT\n");
 253                 ret = IEEE80211_STA_DISABLE_VHT;
 254                 goto out;
 255         }
 256
 257         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 258                 ret = 0;
 259                 goto out;
 260         }
 261
 262         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 263                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 264                         sdata_info(sdata,
 265                                    "AP VHT information doesn't match HT, disable VHT\n");
 266                 ret = IEEE80211_STA_DISABLE_VHT;
 267                 goto out;
 268         }
 269
 270         *chandef = vht_chandef;
 271
 272         ret = 0;
 273
 274 out:
 275         /*
 276          * When tracking the current AP, don't do any further checks if the
 277          * new chandef is identical to the one we're currently using for the
 278          * connection. This keeps us from playing ping-pong with regulatory,
 279          * without it the following can happen (for example):
 280          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 281          *  - AP advertises regdom US
 282          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 283          *  - the code below detects an unsupported channel, downgrades, and
 284          *    we disconnect from the AP in the caller
 285          *  - disconnect causes CRDA to reload world regdomain and the game
 286          *    starts anew.
 287          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 288          *
 289          * It seems possible that there are still scenarios with CSA or real
 290          * bandwidth changes where a this could happen, but those cases are
 291          * less common and wouldn't completely prevent using the AP.
 292          */
 293         if (tracking &&
 294             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 295                 return ret;
 296
 297         /* don't print the message below for VHT mismatch if VHT is disabled */
 298         if (ret & IEEE80211_STA_DISABLE_VHT)
 299                 vht_chandef = *chandef;
 300
 301         /*
 302          * Ignore the DISABLED flag when we're already connected and only
 303          * tracking the APs beacon for bandwidth changes - otherwise we
 304          * might get disconnected here if we connect to an AP, update our
 305          * regulatory information based on the AP's country IE and the
 306          * information we have is wrong/outdated and disables the channel
 307          * that we're actually using for the connection to the AP.
 308          */
 309         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 310                                         tracking ? 0 :
 311                                                    IEEE80211_CHAN_DISABLED)) {
 312                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 313                         ret = IEEE80211_STA_DISABLE_HT |
 314                               IEEE80211_STA_DISABLE_VHT;
 315                         break;
 316                 }
 317
 318                 ret |= ieee80211_chandef_downgrade(chandef);
 319         }
 320
 321         if (chandef->width != vht_chandef.width && !tracking)
 322                 sdata_info(sdata,
 323                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 324
 325         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 326         return ret;
 327 }
 328
 329 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 330                                struct sta_info *sta,
 331                                const struct ieee80211_ht_operation *ht_oper,
 332                                const struct ieee80211_vht_operation *vht_oper,
 333                                const u8 *bssid, u32 *changed)
 334 {
 335         struct ieee80211_local *local = sdata->local;
 336         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 337         struct ieee80211_supported_band *sband;
 338         struct ieee80211_channel *chan;
 339         struct cfg80211_chan_def chandef;
 340         u16 ht_opmode;
 341         u32 flags;
 342         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 343         int ret;
 344
 345         /* if HT was/is disabled, don't track any bandwidth changes */
 346         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 347                 return 0;
 348
 349         /* don't check VHT if we associated as non-VHT station */
 350         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 351                 vht_oper = NULL;
 352
 353         if (WARN_ON_ONCE(!sta))
 354                 return -EINVAL;
 355
 356         /*
 357          * if bss configuration changed store the new one -
 358          * this may be applicable even if channel is identical
 359          */
 360         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 361         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 362                 *changed |= BSS_CHANGED_HT;
 363                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 364         }
 365
 366         chan = sdata->vif.bss_conf.chandef.chan;
 367         sband = local->hw.wiphy->bands[chan->band];
 368
 369         /* calculate new channel (type) based on HT/VHT operation IEs */
 370         flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
 371                                              vht_oper, &chandef, true);
 372
 373         /*
 374          * Downgrade the new channel if we associated with restricted
 375          * capabilities. For example, if we associated as a 20 MHz STA
 376          * to a 40 MHz AP (due to regulatory, capabilities or config
 377          * reasons) then switching to a 40 MHz channel now won't do us
 378          * any good -- we couldn't use it with the AP.
 379          */
 380         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 381             chandef.width == NL80211_CHAN_WIDTH_80P80)
 382                 flags |= ieee80211_chandef_downgrade(&chandef);
 383         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 384             chandef.width == NL80211_CHAN_WIDTH_160)
 385                 flags |= ieee80211_chandef_downgrade(&chandef);
 386         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 387             chandef.width > NL80211_CHAN_WIDTH_20)
 388                 flags |= ieee80211_chandef_downgrade(&chandef);
 389
 390         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 391                 return 0;
 392
 393         sdata_info(sdata,
 394                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 395                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 396                    chandef.center_freq1, chandef.center_freq2);
 397
 398         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 399                                       IEEE80211_STA_DISABLE_VHT |
 400                                       IEEE80211_STA_DISABLE_40MHZ |
 401                                       IEEE80211_STA_DISABLE_80P80MHZ |
 402                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 403             !cfg80211_chandef_valid(&chandef)) {
 404                 sdata_info(sdata,
 405                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 406                            ifmgd->bssid);
 407                 return -EINVAL;
 408         }
 409
 410         switch (chandef.width) {
 411         case NL80211_CHAN_WIDTH_20_NOHT:
 412         case NL80211_CHAN_WIDTH_20:
 413                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 414                 break;
 415         case NL80211_CHAN_WIDTH_40:
 416                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 417                 break;
 418         case NL80211_CHAN_WIDTH_80:
 419                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 420                 break;
 421         case NL80211_CHAN_WIDTH_80P80:
 422         case NL80211_CHAN_WIDTH_160:
 423                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 424                 break;
 425         default:
 426                 return -EINVAL;
 427         }
 428
 429         if (new_sta_bw > sta->cur_max_bandwidth)
 430                 new_sta_bw = sta->cur_max_bandwidth;
 431
 432         if (new_sta_bw < sta->sta.bandwidth) {
 433                 sta->sta.bandwidth = new_sta_bw;
 434                 rate_control_rate_update(local, sband, sta,
 435                                          IEEE80211_RC_BW_CHANGED);
 436         }
 437
 438         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 439         if (ret) {
 440                 sdata_info(sdata,
 441                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 442                            ifmgd->bssid);
 443                 return ret;
 444         }
 445
 446         if (new_sta_bw > sta->sta.bandwidth) {
 447                 sta->sta.bandwidth = new_sta_bw;
 448                 rate_control_rate_update(local, sband, sta,
 449                                          IEEE80211_RC_BW_CHANGED);
 450         }
 451
 452         return 0;
 453 }
 454
 455 /* frame sending functions */
 456
 457 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 458                                 struct sk_buff *skb, u8 ap_ht_param,
 459                                 struct ieee80211_supported_band *sband,
 460                                 struct ieee80211_channel *channel,
 461                                 enum ieee80211_smps_mode smps)
 462 {
 463         u8 *pos;
 464         u32 flags = channel->flags;
 465         u16 cap;
 466         struct ieee80211_sta_ht_cap ht_cap;
 467
 468         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 469
 470         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 471         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 472
 473         /* determine capability flags */
 474         cap = ht_cap.cap;
 475
 476         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 477         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 478                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 479                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 480                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 481                 }
 482                 break;
 483         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 484                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 485                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 486                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 487                 }
 488                 break;
 489         }
 490
 491         /*
 492          * If 40 MHz was disabled associate as though we weren't
 493          * capable of 40 MHz -- some broken APs will never fall
 494          * back to trying to transmit in 20 MHz.
 495          */
 496         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 497                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 498                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 499         }
 500
 501         /* set SM PS mode properly */
 502         cap &= ~IEEE80211_HT_CAP_SM_PS;
 503         switch (smps) {
 504         case IEEE80211_SMPS_AUTOMATIC:
 505         case IEEE80211_SMPS_NUM_MODES:
 506                 WARN_ON(1);
 507         case IEEE80211_SMPS_OFF:
 508                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 509                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 510                 break;
 511         case IEEE80211_SMPS_STATIC:
 512                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 513                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 514                 break;
 515         case IEEE80211_SMPS_DYNAMIC:
 516                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 517                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 518                 break;
 519         }
 520
 521         /* reserve and fill IE */
 522         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 523         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 524 }
 525
 526 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 527                                  struct sk_buff *skb,
 528                                  struct ieee80211_supported_band *sband,
 529                                  struct ieee80211_vht_cap *ap_vht_cap)
 530 {
 531         u8 *pos;
 532         u32 cap;
 533         struct ieee80211_sta_vht_cap vht_cap;
 534
 535         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 536
 537         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 538         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 539
 540         /* determine capability flags */
 541         cap = vht_cap.cap;
 542
 543         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 544                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 545                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 546         }
 547
 548         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 549                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 550                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 551         }
 552
 553         /*
 554          * Some APs apparently get confused if our capabilities are better
 555          * than theirs, so restrict what we advertise in the assoc request.
 556          */
 557         if (!(ap_vht_cap->vht_cap_info &
 558                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 559                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 560
 561         /* reserve and fill IE */
 562         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 563         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 564 }
 565
 566 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 567 {
 568         struct ieee80211_local *local = sdata->local;
 569         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 570         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 571         struct sk_buff *skb;
 572         struct ieee80211_mgmt *mgmt;
 573         u8 *pos, qos_info;
 574         size_t offset = 0, noffset;
 575         int i, count, rates_len, supp_rates_len, shift;
 576         u16 capab;
 577         struct ieee80211_supported_band *sband;
 578         struct ieee80211_chanctx_conf *chanctx_conf;
 579         struct ieee80211_channel *chan;
 580         u32 rate_flags, rates = 0;
 581
 582         sdata_assert_lock(sdata);
 583
 584         rcu_read_lock();
 585         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 586         if (WARN_ON(!chanctx_conf)) {
 587                 rcu_read_unlock();
 588                 return;
 589         }
 590         chan = chanctx_conf->def.chan;
 591         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 592         rcu_read_unlock();
 593         sband = local->hw.wiphy->bands[chan->band];
 594         shift = ieee80211_vif_get_shift(&sdata->vif);
 595
 596         if (assoc_data->supp_rates_len) {
 597                 /*
 598                  * Get all rates supported by the device and the AP as
 599                  * some APs don't like getting a superset of their rates
 600                  * in the association request (e.g. D-Link DAP 1353 in
 601                  * b-only mode)...
 602                  */
 603                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 604                                                      assoc_data->supp_rates,
 605                                                      assoc_data->supp_rates_len,
 606                                                      &rates);
 607         } else {
 608                 /*
 609                  * In case AP not provide any supported rates information
 610                  * before association, we send information element(s) with
 611                  * all rates that we support.
 612                  */
 613                 rates_len = 0;
 614                 for (i = 0; i < sband->n_bitrates; i++) {
 615                         if ((rate_flags & sband->bitrates[i].flags)
 616                             != rate_flags)
 617                                 continue;
 618                         rates |= BIT(i);
 619                         rates_len++;
 620                 }
 621         }
 622
 623         skb = alloc_skb(local->hw.extra_tx_headroom +
 624                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 625                         2 + assoc_data->ssid_len + /* SSID */
 626                         4 + rates_len + /* (extended) rates */
 627                         4 + /* power capability */
 628                         2 + 2 * sband->n_channels + /* supported channels */
 629                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 630                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 631                         assoc_data->ie_len + /* extra IEs */
 632                         9, /* WMM */
 633                         GFP_KERNEL);
 634         if (!skb)
 635                 return;
 636
 637         skb_reserve(skb, local->hw.extra_tx_headroom);
 638
 639         capab = WLAN_CAPABILITY_ESS;
 640
 641         if (sband->band == IEEE80211_BAND_2GHZ) {
 642                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 643                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 644                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 645                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 646         }
 647
 648         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 649                 capab |= WLAN_CAPABILITY_PRIVACY;
 650
 651         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 652             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 653                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 654
 655         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 656         memset(mgmt, 0, 24);
 657         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 658         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 659         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 660
 661         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 662                 skb_put(skb, 10);
 663                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 664                                                   IEEE80211_STYPE_REASSOC_REQ);
 665                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 666                 mgmt->u.reassoc_req.listen_interval =
 667                                 cpu_to_le16(local->hw.conf.listen_interval);
 668                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 669                        ETH_ALEN);
 670         } else {
 671                 skb_put(skb, 4);
 672                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 673                                                   IEEE80211_STYPE_ASSOC_REQ);
 674                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 675                 mgmt->u.assoc_req.listen_interval =
 676                                 cpu_to_le16(local->hw.conf.listen_interval);
 677         }
 678
 679         /* SSID */
 680         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 681         *pos++ = WLAN_EID_SSID;
 682         *pos++ = assoc_data->ssid_len;
 683         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 684
 685         /* add all rates which were marked to be used above */
 686         supp_rates_len = rates_len;
 687         if (supp_rates_len > 8)
 688                 supp_rates_len = 8;
 689
 690         pos = skb_put(skb, supp_rates_len + 2);
 691         *pos++ = WLAN_EID_SUPP_RATES;
 692         *pos++ = supp_rates_len;
 693
 694         count = 0;
 695         for (i = 0; i < sband->n_bitrates; i++) {
 696                 if (BIT(i) & rates) {
 697                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 698                                                 5 * (1 << shift));
 699                         *pos++ = (u8) rate;
 700                         if (++count == 8)
 701                                 break;
 702                 }
 703         }
 704
 705         if (rates_len > count) {
 706                 pos = skb_put(skb, rates_len - count + 2);
 707                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 708                 *pos++ = rates_len - count;
 709
 710                 for (i++; i < sband->n_bitrates; i++) {
 711                         if (BIT(i) & rates) {
 712                                 int rate;
 713                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 714                                                     5 * (1 << shift));
 715                                 *pos++ = (u8) rate;
 716                         }
 717                 }
 718         }
 719
 720         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 721                 /* 1. power capabilities */
 722                 pos = skb_put(skb, 4);
 723                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 724                 *pos++ = 2;
 725                 *pos++ = 0; /* min tx power */
 726                  /* max tx power */
 727                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 728
 729                 /* 2. supported channels */
 730                 /* TODO: get this in reg domain format */
 731                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 732                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 733                 *pos++ = 2 * sband->n_channels;
 734                 for (i = 0; i < sband->n_channels; i++) {
 735                         *pos++ = ieee80211_frequency_to_channel(
 736                                         sband->channels[i].center_freq);
 737                         *pos++ = 1; /* one channel in the subband*/
 738                 }
 739         }
 740
 741         /* if present, add any custom IEs that go before HT */
 742         if (assoc_data->ie_len) {
 743                 static const u8 before_ht[] = {
 744                         WLAN_EID_SSID,
 745                         WLAN_EID_SUPP_RATES,
 746                         WLAN_EID_EXT_SUPP_RATES,
 747                         WLAN_EID_PWR_CAPABILITY,
 748                         WLAN_EID_SUPPORTED_CHANNELS,
 749                         WLAN_EID_RSN,
 750                         WLAN_EID_QOS_CAPA,
 751                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 752                         WLAN_EID_MOBILITY_DOMAIN,
 753                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 754                 };
 755                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 756                                              before_ht, ARRAY_SIZE(before_ht),
 757                                              offset);
 758                 pos = skb_put(skb, noffset - offset);
 759                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 760                 offset = noffset;
 761         }
 762
 763         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 764                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 765                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 766
 767         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 768                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 769                                     sband, chan, sdata->smps_mode);
 770
 771         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 772                 ieee80211_add_vht_ie(sdata, skb, sband,
 773                                      &assoc_data->ap_vht_cap);
 774
 775         /* if present, add any custom non-vendor IEs that go after HT */
 776         if (assoc_data->ie_len) {
 777                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 778                                                     assoc_data->ie_len,
 779                                                     offset);
 780                 pos = skb_put(skb, noffset - offset);
 781                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 782                 offset = noffset;
 783         }
 784
 785         if (assoc_data->wmm) {
 786                 if (assoc_data->uapsd) {
 787                         qos_info = ifmgd->uapsd_queues;
 788                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 789                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 790                 } else {
 791                         qos_info = 0;
 792                 }
 793
 794                 pos = skb_put(skb, 9);
 795                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 796                 *pos++ = 7; /* len */
 797                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 798                 *pos++ = 0x50;
 799                 *pos++ = 0xf2;
 800                 *pos++ = 2; /* WME */
 801                 *pos++ = 0; /* WME info */
 802                 *pos++ = 1; /* WME ver */
 803                 *pos++ = qos_info;
 804         }
 805
 806         /* add any remaining custom (i.e. vendor specific here) IEs */
 807         if (assoc_data->ie_len) {
 808                 noffset = assoc_data->ie_len;
 809                 pos = skb_put(skb, noffset - offset);
 810                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 811         }
 812
 813         drv_mgd_prepare_tx(local, sdata);
 814
 815         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 816         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 817                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 818                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 819         ieee80211_tx_skb(sdata, skb);
 820 }
 821
 822 void ieee80211_send_pspoll(struct ieee80211_local *local,
 823                            struct ieee80211_sub_if_data *sdata)
 824 {
 825         struct ieee80211_pspoll *pspoll;
 826         struct sk_buff *skb;
 827
 828         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 829         if (!skb)
 830                 return;
 831
 832         pspoll = (struct ieee80211_pspoll *) skb->data;
 833         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 834
 835         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 836         ieee80211_tx_skb(sdata, skb);
 837 }
 838
 839 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 840                              struct ieee80211_sub_if_data *sdata,
 841                              int powersave)
 842 {
 843         struct sk_buff *skb;
 844         struct ieee80211_hdr_3addr *nullfunc;
 845         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 846
 847         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 848         if (!skb)
 849                 return;
 850
 851         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 852         if (powersave)
 853                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 854
 855         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 856                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 857
 858         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 859                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 860
 861         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 862                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 863
 864         ieee80211_tx_skb(sdata, skb);
 865 }
 866
 867 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 868                                           struct ieee80211_sub_if_data *sdata)
 869 {
 870         struct sk_buff *skb;
 871         struct ieee80211_hdr *nullfunc;
 872         __le16 fc;
 873
 874         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 875                 return;
 876
 877         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 878         if (!skb)
 879                 return;
 880
 881         skb_reserve(skb, local->hw.extra_tx_headroom);
 882
 883         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 884         memset(nullfunc, 0, 30);
 885         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 886                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 887         nullfunc->frame_control = fc;
 888         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 889         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 890         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 891         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 892
 893         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 894         ieee80211_tx_skb(sdata, skb);
 895 }
 896
 897 /* spectrum management related things */
 898 static void ieee80211_chswitch_work(struct work_struct *work)
 899 {
 900         struct ieee80211_sub_if_data *sdata =
 901                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 902         struct ieee80211_local *local = sdata->local;
 903         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 904         u32 changed = 0;
 905         int ret;
 906
 907         if (!ieee80211_sdata_running(sdata))
 908                 return;
 909
 910         sdata_lock(sdata);
 911         if (!ifmgd->associated)
 912                 goto out;
 913
 914         mutex_lock(&local->mtx);
 915         ret = ieee80211_vif_change_channel(sdata, &changed);
 916         mutex_unlock(&local->mtx);
 917         if (ret) {
 918                 sdata_info(sdata,
 919                            "vif channel switch failed, disconnecting\n");
 920                 ieee80211_queue_work(&sdata->local->hw,
 921                                      &ifmgd->csa_connection_drop_work);
 922                 goto out;
 923         }
 924
 925         if (!local->use_chanctx) {
 926                 local->_oper_chandef = sdata->csa_chandef;
 927                 /* Call "hw_config" only if doing sw channel switch.
 928                  * Otherwise update the channel directly
 929                  */
 930                 if (!local->ops->channel_switch)
 931                         ieee80211_hw_config(local, 0);
 932                 else
 933                         local->hw.conf.chandef = local->_oper_chandef;
 934         }
 935
 936         /* XXX: shouldn't really modify cfg80211-owned data! */
 937         ifmgd->associated->channel = sdata->csa_chandef.chan;
 938
 939         /* XXX: wait for a beacon first? */
 940         ieee80211_wake_queues_by_reason(&local->hw,
 941                                         IEEE80211_MAX_QUEUE_MAP,
 942                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 943
 944         ieee80211_bss_info_change_notify(sdata, changed);
 945
 946  out:
 947         sdata->vif.csa_active = false;
 948         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 949         sdata_unlock(sdata);
 950 }
 951
 952 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 953 {
 954         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 955         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 956
 957         trace_api_chswitch_done(sdata, success);
 958         if (!success) {
 959                 sdata_info(sdata,
 960                            "driver channel switch failed, disconnecting\n");
 961                 ieee80211_queue_work(&sdata->local->hw,
 962                                      &ifmgd->csa_connection_drop_work);
 963         } else {
 964                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 965         }
 966 }
 967 EXPORT_SYMBOL(ieee80211_chswitch_done);
 968
 969 static void ieee80211_chswitch_timer(unsigned long data)
 970 {
 971         struct ieee80211_sub_if_data *sdata =
 972                 (struct ieee80211_sub_if_data *) data;
 973
 974         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
 975 }
 976
 977 static void
 978 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 979                                  u64 timestamp, struct ieee802_11_elems *elems,
 980                                  bool beacon)
 981 {
 982         struct ieee80211_local *local = sdata->local;
 983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 984         struct cfg80211_bss *cbss = ifmgd->associated;
 985         struct ieee80211_chanctx *chanctx;
 986         enum ieee80211_band current_band;
 987         struct ieee80211_csa_ie csa_ie;
 988         int res;
 989
 990         sdata_assert_lock(sdata);
 991
 992         if (!cbss)
 993                 return;
 994
 995         if (local->scanning)
 996                 return;
 997
 998         /* disregard subsequent announcements if we are already processing */
 999         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
1000                 return;
1001
1002         current_band = cbss->channel->band;
1003         memset(&csa_ie, 0, sizeof(csa_ie));
1004         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1005                                            ifmgd->flags,
1006                                            ifmgd->associated->bssid, &csa_ie);
1007         if (res < 0)
1008                 ieee80211_queue_work(&local->hw,
1009                                      &ifmgd->csa_connection_drop_work);
1010         if (res)
1011                 return;
1012
1013         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1014                                      IEEE80211_CHAN_DISABLED)) {
1015                 sdata_info(sdata,
1016                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1017                            ifmgd->associated->bssid,
1018                            csa_ie.chandef.chan->center_freq,
1019                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1020                            csa_ie.chandef.center_freq2);
1021                 ieee80211_queue_work(&local->hw,
1022                                      &ifmgd->csa_connection_drop_work);
1023                 return;
1024         }
1025
1026         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1027         sdata->vif.csa_active = true;
1028
1029         mutex_lock(&local->chanctx_mtx);
1030         if (local->use_chanctx) {
1031                 u32 num_chanctx = 0;
1032                 list_for_each_entry(chanctx, &local->chanctx_list, list)
1033                        num_chanctx++;
1034
1035                 if (num_chanctx > 1 ||
1036                     !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1037                         sdata_info(sdata,
1038                                    "not handling chan-switch with channel contexts\n");
1039                         ieee80211_queue_work(&local->hw,
1040                                              &ifmgd->csa_connection_drop_work);
1041                         mutex_unlock(&local->chanctx_mtx);
1042                         return;
1043                 }
1044         }
1045
1046         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1047                 ieee80211_queue_work(&local->hw,
1048                                      &ifmgd->csa_connection_drop_work);
1049                 mutex_unlock(&local->chanctx_mtx);
1050                 return;
1051         }
1052         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1053                                struct ieee80211_chanctx, conf);
1054         if (chanctx->refcount > 1) {
1055                 sdata_info(sdata,
1056                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
1057                 ieee80211_queue_work(&local->hw,
1058                                      &ifmgd->csa_connection_drop_work);
1059                 mutex_unlock(&local->chanctx_mtx);
1060                 return;
1061         }
1062         mutex_unlock(&local->chanctx_mtx);
1063
1064         sdata->csa_chandef = csa_ie.chandef;
1065
1066         if (csa_ie.mode)
1067                 ieee80211_stop_queues_by_reason(&local->hw,
1068                                 IEEE80211_MAX_QUEUE_MAP,
1069                                 IEEE80211_QUEUE_STOP_REASON_CSA);
1070
1071         if (local->ops->channel_switch) {
1072                 /* use driver's channel switch callback */
1073                 struct ieee80211_channel_switch ch_switch = {
1074                         .timestamp = timestamp,
1075                         .block_tx = csa_ie.mode,
1076                         .chandef = csa_ie.chandef,
1077                         .count = csa_ie.count,
1078                 };
1079
1080                 drv_channel_switch(local, &ch_switch);
1081                 return;
1082         }
1083
1084         /* channel switch handled in software */
1085         if (csa_ie.count <= 1)
1086                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1087         else
1088                 mod_timer(&ifmgd->chswitch_timer,
1089                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1090                                          cbss->beacon_interval));
1091 }
1092
1093 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1094                                        struct ieee80211_channel *channel,
1095                                        const u8 *country_ie, u8 country_ie_len,
1096                                        const u8 *pwr_constr_elem)
1097 {
1098         struct ieee80211_country_ie_triplet *triplet;
1099         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1100         int i, chan_pwr, chan_increment, new_ap_level;
1101         bool have_chan_pwr = false;
1102
1103         /* Invalid IE */
1104         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1105                 return 0;
1106
1107         triplet = (void *)(country_ie + 3);
1108         country_ie_len -= 3;
1109
1110         switch (channel->band) {
1111         default:
1112                 WARN_ON_ONCE(1);
1113                 /* fall through */
1114         case IEEE80211_BAND_2GHZ:
1115         case IEEE80211_BAND_60GHZ:
1116                 chan_increment = 1;
1117                 break;
1118         case IEEE80211_BAND_5GHZ:
1119                 chan_increment = 4;
1120                 break;
1121         }
1122
1123         /* find channel */
1124         while (country_ie_len >= 3) {
1125                 u8 first_channel = triplet->chans.first_channel;
1126
1127                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1128                         goto next;
1129
1130                 for (i = 0; i < triplet->chans.num_channels; i++) {
1131                         if (first_channel + i * chan_increment == chan) {
1132                                 have_chan_pwr = true;
1133                                 chan_pwr = triplet->chans.max_power;
1134                                 break;
1135                         }
1136                 }
1137                 if (have_chan_pwr)
1138                         break;
1139
1140  next:
1141                 triplet++;
1142                 country_ie_len -= 3;
1143         }
1144
1145         if (!have_chan_pwr)
1146                 return 0;
1147
1148         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1149
1150         if (sdata->ap_power_level == new_ap_level)
1151                 return 0;
1152
1153         sdata_info(sdata,
1154                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1155                    new_ap_level, chan_pwr, *pwr_constr_elem,
1156                    sdata->u.mgd.bssid);
1157         sdata->ap_power_level = new_ap_level;
1158         if (__ieee80211_recalc_txpower(sdata))
1159                 return BSS_CHANGED_TXPOWER;
1160         return 0;
1161 }
1162
1163 /* powersave */
1164 static void ieee80211_enable_ps(struct ieee80211_local *local,
1165                                 struct ieee80211_sub_if_data *sdata)
1166 {
1167         struct ieee80211_conf *conf = &local->hw.conf;
1168
1169         /*
1170          * If we are scanning right now then the parameters will
1171          * take effect when scan finishes.
1172          */
1173         if (local->scanning)
1174                 return;
1175
1176         if (conf->dynamic_ps_timeout > 0 &&
1177             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1178                 mod_timer(&local->dynamic_ps_timer, jiffies +
1179                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1180         } else {
1181                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1182                         ieee80211_send_nullfunc(local, sdata, 1);
1183
1184                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1185                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1186                         return;
1187
1188                 conf->flags |= IEEE80211_CONF_PS;
1189                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1190         }
1191 }
1192
1193 static void ieee80211_change_ps(struct ieee80211_local *local)
1194 {
1195         struct ieee80211_conf *conf = &local->hw.conf;
1196
1197         if (local->ps_sdata) {
1198                 ieee80211_enable_ps(local, local->ps_sdata);
1199         } else if (conf->flags & IEEE80211_CONF_PS) {
1200                 conf->flags &= ~IEEE80211_CONF_PS;
1201                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1202                 del_timer_sync(&local->dynamic_ps_timer);
1203                 cancel_work_sync(&local->dynamic_ps_enable_work);
1204         }
1205 }
1206
1207 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1208 {
1209         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1210         struct sta_info *sta = NULL;
1211         bool authorized = false;
1212
1213         if (!mgd->powersave)
1214                 return false;
1215
1216         if (mgd->broken_ap)
1217                 return false;
1218
1219         if (!mgd->associated)
1220                 return false;
1221
1222         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1223                 return false;
1224
1225         if (!mgd->have_beacon)
1226                 return false;
1227
1228         rcu_read_lock();
1229         sta = sta_info_get(sdata, mgd->bssid);
1230         if (sta)
1231                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1232         rcu_read_unlock();
1233
1234         return authorized;
1235 }
1236
1237 /* need to hold RTNL or interface lock */
1238 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1239 {
1240         struct ieee80211_sub_if_data *sdata, *found = NULL;
1241         int count = 0;
1242         int timeout;
1243
1244         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1245                 local->ps_sdata = NULL;
1246                 return;
1247         }
1248
1249         list_for_each_entry(sdata, &local->interfaces, list) {
1250                 if (!ieee80211_sdata_running(sdata))
1251                         continue;
1252                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1253                         /* If an AP vif is found, then disable PS
1254                          * by setting the count to zero thereby setting
1255                          * ps_sdata to NULL.
1256                          */
1257                         count = 0;
1258                         break;
1259                 }
1260                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1261                         continue;
1262                 found = sdata;
1263                 count++;
1264         }
1265
1266         if (count == 1 && ieee80211_powersave_allowed(found)) {
1267                 s32 beaconint_us;
1268
1269                 if (latency < 0)
1270                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1271
1272                 beaconint_us = ieee80211_tu_to_usec(
1273                                         found->vif.bss_conf.beacon_int);
1274
1275                 timeout = local->dynamic_ps_forced_timeout;
1276                 if (timeout < 0) {
1277                         /*
1278                          * Go to full PSM if the user configures a very low
1279                          * latency requirement.
1280                          * The 2000 second value is there for compatibility
1281                          * until the PM_QOS_NETWORK_LATENCY is configured
1282                          * with real values.
1283                          */
1284                         if (latency > (1900 * USEC_PER_MSEC) &&
1285                             latency != (2000 * USEC_PER_SEC))
1286                                 timeout = 0;
1287                         else
1288                                 timeout = 100;
1289                 }
1290                 local->hw.conf.dynamic_ps_timeout = timeout;
1291
1292                 if (beaconint_us > latency) {
1293                         local->ps_sdata = NULL;
1294                 } else {
1295                         int maxslp = 1;
1296                         u8 dtimper = found->u.mgd.dtim_period;
1297
1298                         /* If the TIM IE is invalid, pretend the value is 1 */
1299                         if (!dtimper)
1300                                 dtimper = 1;
1301                         else if (dtimper > 1)
1302                                 maxslp = min_t(int, dtimper,
1303                                                     latency / beaconint_us);
1304
1305                         local->hw.conf.max_sleep_period = maxslp;
1306                         local->hw.conf.ps_dtim_period = dtimper;
1307                         local->ps_sdata = found;
1308                 }
1309         } else {
1310                 local->ps_sdata = NULL;
1311         }
1312
1313         ieee80211_change_ps(local);
1314 }
1315
1316 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1317 {
1318         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1319
1320         if (sdata->vif.bss_conf.ps != ps_allowed) {
1321                 sdata->vif.bss_conf.ps = ps_allowed;
1322                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1323         }
1324 }
1325
1326 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1327 {
1328         struct ieee80211_local *local =
1329                 container_of(work, struct ieee80211_local,
1330                              dynamic_ps_disable_work);
1331
1332         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1333                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1334                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1335         }
1336
1337         ieee80211_wake_queues_by_reason(&local->hw,
1338                                         IEEE80211_MAX_QUEUE_MAP,
1339                                         IEEE80211_QUEUE_STOP_REASON_PS);
1340 }
1341
1342 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1343 {
1344         struct ieee80211_local *local =
1345                 container_of(work, struct ieee80211_local,
1346                              dynamic_ps_enable_work);
1347         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1348         struct ieee80211_if_managed *ifmgd;
1349         unsigned long flags;
1350         int q;
1351
1352         /* can only happen when PS was just disabled anyway */
1353         if (!sdata)
1354                 return;
1355
1356         ifmgd = &sdata->u.mgd;
1357
1358         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1359                 return;
1360
1361         if (local->hw.conf.dynamic_ps_timeout > 0) {
1362                 /* don't enter PS if TX frames are pending */
1363                 if (drv_tx_frames_pending(local)) {
1364                         mod_timer(&local->dynamic_ps_timer, jiffies +
1365                                   msecs_to_jiffies(
1366                                   local->hw.conf.dynamic_ps_timeout));
1367                         return;
1368                 }
1369
1370                 /*
1371                  * transmission can be stopped by others which leads to
1372                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1373                  * is not the actual idle state.
1374                  */
1375                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1376                 for (q = 0; q < local->hw.queues; q++) {
1377                         if (local->queue_stop_reasons[q]) {
1378                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1379                                                        flags);
1380                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1381                                           msecs_to_jiffies(
1382                                           local->hw.conf.dynamic_ps_timeout));
1383                                 return;
1384                         }
1385                 }
1386                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1387         }
1388
1389         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1390             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1391                 if (drv_tx_frames_pending(local)) {
1392                         mod_timer(&local->dynamic_ps_timer, jiffies +
1393                                   msecs_to_jiffies(
1394                                   local->hw.conf.dynamic_ps_timeout));
1395                 } else {
1396                         ieee80211_send_nullfunc(local, sdata, 1);
1397                         /* Flush to get the tx status of nullfunc frame */
1398                         ieee80211_flush_queues(local, sdata);
1399                 }
1400         }
1401
1402         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1403               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1404             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1405                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1406                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1407                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1408         }
1409 }
1410
1411 void ieee80211_dynamic_ps_timer(unsigned long data)
1412 {
1413         struct ieee80211_local *local = (void *) data;
1414
1415         if (local->quiescing || local->suspended)
1416                 return;
1417
1418         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1419 }
1420
1421 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1422 {
1423         struct delayed_work *delayed_work =
1424                 container_of(work, struct delayed_work, work);
1425         struct ieee80211_sub_if_data *sdata =
1426                 container_of(delayed_work, struct ieee80211_sub_if_data,
1427                              dfs_cac_timer_work);
1428         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1429
1430         mutex_lock(&sdata->local->mtx);
1431         if (sdata->wdev.cac_started) {
1432                 ieee80211_vif_release_channel(sdata);
1433                 cfg80211_cac_event(sdata->dev, &chandef,
1434                                    NL80211_RADAR_CAC_FINISHED,
1435                                    GFP_KERNEL);
1436         }
1437         mutex_unlock(&sdata->local->mtx);
1438 }
1439
1440 /* MLME */
1441 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1442                                      struct ieee80211_sub_if_data *sdata,
1443                                      const u8 *wmm_param, size_t wmm_param_len)
1444 {
1445         struct ieee80211_tx_queue_params params;
1446         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1447         size_t left;
1448         int count;
1449         const u8 *pos;
1450         u8 uapsd_queues = 0;
1451
1452         if (!local->ops->conf_tx)
1453                 return false;
1454
1455         if (local->hw.queues < IEEE80211_NUM_ACS)
1456                 return false;
1457
1458         if (!wmm_param)
1459                 return false;
1460
1461         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1462                 return false;
1463
1464         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1465                 uapsd_queues = ifmgd->uapsd_queues;
1466
1467         count = wmm_param[6] & 0x0f;
1468         if (count == ifmgd->wmm_last_param_set)
1469                 return false;
1470         ifmgd->wmm_last_param_set = count;
1471
1472         pos = wmm_param + 8;
1473         left = wmm_param_len - 8;
1474
1475         memset(&params, 0, sizeof(params));
1476
1477         sdata->wmm_acm = 0;
1478         for (; left >= 4; left -= 4, pos += 4) {
1479                 int aci = (pos[0] >> 5) & 0x03;
1480                 int acm = (pos[0] >> 4) & 0x01;
1481                 bool uapsd = false;
1482                 int queue;
1483
1484                 switch (aci) {
1485                 case 1: /* AC_BK */
1486                         queue = 3;
1487                         if (acm)
1488                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1489                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1490                                 uapsd = true;
1491                         break;
1492                 case 2: /* AC_VI */
1493                         queue = 1;
1494                         if (acm)
1495                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1496                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1497                                 uapsd = true;
1498                         break;
1499                 case 3: /* AC_VO */
1500                         queue = 0;
1501                         if (acm)
1502                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1503                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1504                                 uapsd = true;
1505                         break;
1506                 case 0: /* AC_BE */
1507                 default:
1508                         queue = 2;
1509                         if (acm)
1510                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1511                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1512                                 uapsd = true;
1513                         break;
1514                 }
1515
1516                 params.aifs = pos[0] & 0x0f;
1517                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1518                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1519                 params.txop = get_unaligned_le16(pos + 2);
1520                 params.acm = acm;
1521                 params.uapsd = uapsd;
1522
1523                 mlme_dbg(sdata,
1524                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1525                          queue, aci, acm,
1526                          params.aifs, params.cw_min, params.cw_max,
1527                          params.txop, params.uapsd);
1528                 sdata->tx_conf[queue] = params;
1529                 if (drv_conf_tx(local, sdata, queue, &params))
1530                         sdata_err(sdata,
1531                                   "failed to set TX queue parameters for queue %d\n",
1532                                   queue);
1533         }
1534
1535         /* enable WMM or activate new settings */
1536         sdata->vif.bss_conf.qos = true;
1537         return true;
1538 }
1539
1540 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1541 {
1542         lockdep_assert_held(&sdata->local->mtx);
1543
1544         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1545         ieee80211_run_deferred_scan(sdata->local);
1546 }
1547
1548 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1549 {
1550         mutex_lock(&sdata->local->mtx);
1551         __ieee80211_stop_poll(sdata);
1552         mutex_unlock(&sdata->local->mtx);
1553 }
1554
1555 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1556                                            u16 capab, bool erp_valid, u8 erp)
1557 {
1558         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1559         u32 changed = 0;
1560         bool use_protection;
1561         bool use_short_preamble;
1562         bool use_short_slot;
1563
1564         if (erp_valid) {
1565                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1566                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1567         } else {
1568                 use_protection = false;
1569                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1570         }
1571
1572         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1573         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1574                 use_short_slot = true;
1575
1576         if (use_protection != bss_conf->use_cts_prot) {
1577                 bss_conf->use_cts_prot = use_protection;
1578                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1579         }
1580
1581         if (use_short_preamble != bss_conf->use_short_preamble) {
1582                 bss_conf->use_short_preamble = use_short_preamble;
1583                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1584         }
1585
1586         if (use_short_slot != bss_conf->use_short_slot) {
1587                 bss_conf->use_short_slot = use_short_slot;
1588                 changed |= BSS_CHANGED_ERP_SLOT;
1589         }
1590
1591         return changed;
1592 }
1593
1594 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1595                                      struct cfg80211_bss *cbss,
1596                                      u32 bss_info_changed)
1597 {
1598         struct ieee80211_bss *bss = (void *)cbss->priv;
1599         struct ieee80211_local *local = sdata->local;
1600         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1601
1602         bss_info_changed |= BSS_CHANGED_ASSOC;
1603         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1604                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1605
1606         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1607                 beacon_loss_count * bss_conf->beacon_int));
1608
1609         sdata->u.mgd.associated = cbss;
1610         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1611
1612         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1613
1614         if (sdata->vif.p2p) {
1615                 const struct cfg80211_bss_ies *ies;
1616
1617                 rcu_read_lock();
1618                 ies = rcu_dereference(cbss->ies);
1619                 if (ies) {
1620                         int ret;
1621
1622                         ret = cfg80211_get_p2p_attr(
1623                                         ies->data, ies->len,
1624                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1625                                         (u8 *) &bss_conf->p2p_noa_attr,
1626                                         sizeof(bss_conf->p2p_noa_attr));
1627                         if (ret >= 2) {
1628                                 sdata->u.mgd.p2p_noa_index =
1629                                         bss_conf->p2p_noa_attr.index;
1630                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1631                         }
1632                 }
1633                 rcu_read_unlock();
1634         }
1635
1636         /* just to be sure */
1637         ieee80211_stop_poll(sdata);
1638
1639         ieee80211_led_assoc(local, 1);
1640
1641         if (sdata->u.mgd.have_beacon) {
1642                 /*
1643                  * If the AP is buggy we may get here with no DTIM period
1644                  * known, so assume it's 1 which is the only safe assumption
1645                  * in that case, although if the TIM IE is broken powersave
1646                  * probably just won't work at all.
1647                  */
1648                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1649                 bss_conf->beacon_rate = bss->beacon_rate;
1650                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1651         } else {
1652                 bss_conf->beacon_rate = NULL;
1653                 bss_conf->dtim_period = 0;
1654         }
1655
1656         bss_conf->assoc = 1;
1657
1658         /* Tell the driver to monitor connection quality (if supported) */
1659         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1660             bss_conf->cqm_rssi_thold)
1661                 bss_info_changed |= BSS_CHANGED_CQM;
1662
1663         /* Enable ARP filtering */
1664         if (bss_conf->arp_addr_cnt)
1665                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1666
1667         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1668
1669         mutex_lock(&local->iflist_mtx);
1670         ieee80211_recalc_ps(local, -1);
1671         mutex_unlock(&local->iflist_mtx);
1672
1673         ieee80211_recalc_smps(sdata);
1674         ieee80211_recalc_ps_vif(sdata);
1675
1676         netif_carrier_on(sdata->dev);
1677 }
1678
1679 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1680                                    u16 stype, u16 reason, bool tx,
1681                                    u8 *frame_buf)
1682 {
1683         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1684         struct ieee80211_local *local = sdata->local;
1685         u32 changed = 0;
1686
1687         sdata_assert_lock(sdata);
1688
1689         if (WARN_ON_ONCE(tx && !frame_buf))
1690                 return;
1691
1692         if (WARN_ON(!ifmgd->associated))
1693                 return;
1694
1695         ieee80211_stop_poll(sdata);
1696
1697         ifmgd->associated = NULL;
1698         netif_carrier_off(sdata->dev);
1699
1700         /*
1701          * if we want to get out of ps before disassoc (why?) we have
1702          * to do it before sending disassoc, as otherwise the null-packet
1703          * won't be valid.
1704          */
1705         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1706                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1707                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1708         }
1709         local->ps_sdata = NULL;
1710
1711         /* disable per-vif ps */
1712         ieee80211_recalc_ps_vif(sdata);
1713
1714         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1715         if (tx)
1716                 ieee80211_flush_queues(local, sdata);
1717
1718         /* deauthenticate/disassociate now */
1719         if (tx || frame_buf)
1720                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1721                                                reason, tx, frame_buf);
1722
1723         /* flush out frame */
1724         if (tx)
1725                 ieee80211_flush_queues(local, sdata);
1726
1727         /* clear bssid only after building the needed mgmt frames */
1728         memset(ifmgd->bssid, 0, ETH_ALEN);
1729
1730         /* remove AP and TDLS peers */
1731         sta_info_flush(sdata);
1732
1733         /* finally reset all BSS / config parameters */
1734         changed |= ieee80211_reset_erp_info(sdata);
1735
1736         ieee80211_led_assoc(local, 0);
1737         changed |= BSS_CHANGED_ASSOC;
1738         sdata->vif.bss_conf.assoc = false;
1739
1740         ifmgd->p2p_noa_index = -1;
1741         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1742                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1743
1744         /* on the next assoc, re-program HT/VHT parameters */
1745         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1746         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1747         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1748         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1749
1750         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1751
1752         del_timer_sync(&local->dynamic_ps_timer);
1753         cancel_work_sync(&local->dynamic_ps_enable_work);
1754
1755         /* Disable ARP filtering */
1756         if (sdata->vif.bss_conf.arp_addr_cnt)
1757                 changed |= BSS_CHANGED_ARP_FILTER;
1758
1759         sdata->vif.bss_conf.qos = false;
1760         changed |= BSS_CHANGED_QOS;
1761
1762         /* The BSSID (not really interesting) and HT changed */
1763         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1764         ieee80211_bss_info_change_notify(sdata, changed);
1765
1766         /* disassociated - set to defaults now */
1767         ieee80211_set_wmm_default(sdata, false);
1768
1769         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1770         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1771         del_timer_sync(&sdata->u.mgd.timer);
1772         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1773
1774         sdata->vif.bss_conf.dtim_period = 0;
1775         sdata->vif.bss_conf.beacon_rate = NULL;
1776
1777         ifmgd->have_beacon = false;
1778
1779         ifmgd->flags = 0;
1780         mutex_lock(&local->mtx);
1781         ieee80211_vif_release_channel(sdata);
1782         mutex_unlock(&local->mtx);
1783
1784         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1785 }
1786
1787 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1788                              struct ieee80211_hdr *hdr)
1789 {
1790         /*
1791          * We can postpone the mgd.timer whenever receiving unicast frames
1792          * from AP because we know that the connection is working both ways
1793          * at that time. But multicast frames (and hence also beacons) must
1794          * be ignored here, because we need to trigger the timer during
1795          * data idle periods for sending the periodic probe request to the
1796          * AP we're connected to.
1797          */
1798         if (is_multicast_ether_addr(hdr->addr1))
1799                 return;
1800
1801         ieee80211_sta_reset_conn_monitor(sdata);
1802 }
1803
1804 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1805 {
1806         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1807         struct ieee80211_local *local = sdata->local;
1808
1809         mutex_lock(&local->mtx);
1810         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
1811                 goto out;
1812
1813         __ieee80211_stop_poll(sdata);
1814
1815         mutex_lock(&local->iflist_mtx);
1816         ieee80211_recalc_ps(local, -1);
1817         mutex_unlock(&local->iflist_mtx);
1818
1819         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1820                 goto out;
1821
1822         /*
1823          * We've received a probe response, but are not sure whether
1824          * we have or will be receiving any beacons or data, so let's
1825          * schedule the timers again, just in case.
1826          */
1827         ieee80211_sta_reset_beacon_monitor(sdata);
1828
1829         mod_timer(&ifmgd->conn_mon_timer,
1830                   round_jiffies_up(jiffies +
1831                                    IEEE80211_CONNECTION_IDLE_TIME));
1832 out:
1833         mutex_unlock(&local->mtx);
1834 }
1835
1836 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1837                              struct ieee80211_hdr *hdr, bool ack)
1838 {
1839         if (!ieee80211_is_data(hdr->frame_control))
1840             return;
1841
1842         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1843             sdata->u.mgd.probe_send_count > 0) {
1844                 if (ack)
1845                         ieee80211_sta_reset_conn_monitor(sdata);
1846                 else
1847                         sdata->u.mgd.nullfunc_failed = true;
1848                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1849                 return;
1850         }
1851
1852         if (ack)
1853                 ieee80211_sta_reset_conn_monitor(sdata);
1854 }
1855
1856 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1857 {
1858         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1859         const u8 *ssid;
1860         u8 *dst = ifmgd->associated->bssid;
1861         u8 unicast_limit = max(1, max_probe_tries - 3);
1862
1863         /*
1864          * Try sending broadcast probe requests for the last three
1865          * probe requests after the first ones failed since some
1866          * buggy APs only support broadcast probe requests.
1867          */
1868         if (ifmgd->probe_send_count >= unicast_limit)
1869                 dst = NULL;
1870
1871         /*
1872          * When the hardware reports an accurate Tx ACK status, it's
1873          * better to send a nullfunc frame instead of a probe request,
1874          * as it will kick us off the AP quickly if we aren't associated
1875          * anymore. The timeout will be reset if the frame is ACKed by
1876          * the AP.
1877          */
1878         ifmgd->probe_send_count++;
1879
1880         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1881                 ifmgd->nullfunc_failed = false;
1882                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1883         } else {
1884                 int ssid_len;
1885
1886                 rcu_read_lock();
1887                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1888                 if (WARN_ON_ONCE(ssid == NULL))
1889                         ssid_len = 0;
1890                 else
1891                         ssid_len = ssid[1];
1892
1893                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1894                                          0, (u32) -1, true, 0,
1895                                          ifmgd->associated->channel, false);
1896                 rcu_read_unlock();
1897         }
1898
1899         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1900         run_again(sdata, ifmgd->probe_timeout);
1901         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1902                 ieee80211_flush_queues(sdata->local, sdata);
1903 }
1904
1905 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1906                                    bool beacon)
1907 {
1908         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1909         bool already = false;
1910
1911         if (!ieee80211_sdata_running(sdata))
1912                 return;
1913
1914         sdata_lock(sdata);
1915
1916         if (!ifmgd->associated)
1917                 goto out;
1918
1919         mutex_lock(&sdata->local->mtx);
1920
1921         if (sdata->local->tmp_channel || sdata->local->scanning) {
1922                 mutex_unlock(&sdata->local->mtx);
1923                 goto out;
1924         }
1925
1926         if (beacon) {
1927                 mlme_dbg_ratelimited(sdata,
1928                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
1929                                      beacon_loss_count);
1930
1931                 ieee80211_cqm_rssi_notify(&sdata->vif,
1932                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
1933                                           GFP_KERNEL);
1934         }
1935
1936         /*
1937          * The driver/our work has already reported this event or the
1938          * connection monitoring has kicked in and we have already sent
1939          * a probe request. Or maybe the AP died and the driver keeps
1940          * reporting until we disassociate...
1941          *
1942          * In either case we have to ignore the current call to this
1943          * function (except for setting the correct probe reason bit)
1944          * because otherwise we would reset the timer every time and
1945          * never check whether we received a probe response!
1946          */
1947         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
1948                 already = true;
1949
1950         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1951
1952         mutex_unlock(&sdata->local->mtx);
1953
1954         if (already)
1955                 goto out;
1956
1957         mutex_lock(&sdata->local->iflist_mtx);
1958         ieee80211_recalc_ps(sdata->local, -1);
1959         mutex_unlock(&sdata->local->iflist_mtx);
1960
1961         ifmgd->probe_send_count = 0;
1962         ieee80211_mgd_probe_ap_send(sdata);
1963  out:
1964         sdata_unlock(sdata);
1965 }
1966
1967 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1968                                           struct ieee80211_vif *vif)
1969 {
1970         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1971         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1972         struct cfg80211_bss *cbss;
1973         struct sk_buff *skb;
1974         const u8 *ssid;
1975         int ssid_len;
1976
1977         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1978                 return NULL;
1979
1980         sdata_assert_lock(sdata);
1981
1982         if (ifmgd->associated)
1983                 cbss = ifmgd->associated;
1984         else if (ifmgd->auth_data)
1985                 cbss = ifmgd->auth_data->bss;
1986         else if (ifmgd->assoc_data)
1987                 cbss = ifmgd->assoc_data->bss;
1988         else
1989                 return NULL;
1990
1991         rcu_read_lock();
1992         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1993         if (WARN_ON_ONCE(ssid == NULL))
1994                 ssid_len = 0;
1995         else
1996                 ssid_len = ssid[1];
1997
1998         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1999                                         (u32) -1, cbss->channel,
2000                                         ssid + 2, ssid_len,
2001                                         NULL, 0, true);
2002         rcu_read_unlock();
2003
2004         return skb;
2005 }
2006 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2007
2008 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2009 {
2010         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2011         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2012
2013         sdata_lock(sdata);
2014         if (!ifmgd->associated) {
2015                 sdata_unlock(sdata);
2016                 return;
2017         }
2018
2019         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2020                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2021                                true, frame_buf);
2022         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2023         sdata->vif.csa_active = false;
2024         ieee80211_wake_queues_by_reason(&sdata->local->hw,
2025                                         IEEE80211_MAX_QUEUE_MAP,
2026                                         IEEE80211_QUEUE_STOP_REASON_CSA);
2027
2028         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2029                               IEEE80211_DEAUTH_FRAME_LEN);
2030         sdata_unlock(sdata);
2031 }
2032
2033 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2034 {
2035         struct ieee80211_sub_if_data *sdata =
2036                 container_of(work, struct ieee80211_sub_if_data,
2037                              u.mgd.beacon_connection_loss_work);
2038         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2039         struct sta_info *sta;
2040
2041         if (ifmgd->associated) {
2042                 rcu_read_lock();
2043                 sta = sta_info_get(sdata, ifmgd->bssid);
2044                 if (sta)
2045                         sta->beacon_loss_count++;
2046                 rcu_read_unlock();
2047         }
2048
2049         if (ifmgd->connection_loss) {
2050                 sdata_info(sdata, "Connection to AP %pM lost\n",
2051                            ifmgd->bssid);
2052                 __ieee80211_disconnect(sdata);
2053         } else {
2054                 ieee80211_mgd_probe_ap(sdata, true);
2055         }
2056 }
2057
2058 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2059 {
2060         struct ieee80211_sub_if_data *sdata =
2061                 container_of(work, struct ieee80211_sub_if_data,
2062                              u.mgd.csa_connection_drop_work);
2063
2064         __ieee80211_disconnect(sdata);
2065 }
2066
2067 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2068 {
2069         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2070         struct ieee80211_hw *hw = &sdata->local->hw;
2071
2072         trace_api_beacon_loss(sdata);
2073
2074         sdata->u.mgd.connection_loss = false;
2075         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2076 }
2077 EXPORT_SYMBOL(ieee80211_beacon_loss);
2078
2079 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2080 {
2081         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2082         struct ieee80211_hw *hw = &sdata->local->hw;
2083
2084         trace_api_connection_loss(sdata);
2085
2086         sdata->u.mgd.connection_loss = true;
2087         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2088 }
2089 EXPORT_SYMBOL(ieee80211_connection_loss);
2090
2091
2092 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2093                                         bool assoc)
2094 {
2095         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2096
2097         sdata_assert_lock(sdata);
2098
2099         if (!assoc) {
2100                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2101
2102                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2103                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2104                 sdata->u.mgd.flags = 0;
2105                 mutex_lock(&sdata->local->mtx);
2106                 ieee80211_vif_release_channel(sdata);
2107                 mutex_unlock(&sdata->local->mtx);
2108         }
2109
2110         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2111         kfree(auth_data);
2112         sdata->u.mgd.auth_data = NULL;
2113 }
2114
2115 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2116                                      struct ieee80211_mgmt *mgmt, size_t len)
2117 {
2118         struct ieee80211_local *local = sdata->local;
2119         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2120         u8 *pos;
2121         struct ieee802_11_elems elems;
2122         u32 tx_flags = 0;
2123
2124         pos = mgmt->u.auth.variable;
2125         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2126         if (!elems.challenge)
2127                 return;
2128         auth_data->expected_transaction = 4;
2129         drv_mgd_prepare_tx(sdata->local, sdata);
2130         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2131                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2132                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2133         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2134                             elems.challenge - 2, elems.challenge_len + 2,
2135                             auth_data->bss->bssid, auth_data->bss->bssid,
2136                             auth_data->key, auth_data->key_len,
2137                             auth_data->key_idx, tx_flags);
2138 }
2139
2140 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2141                                    struct ieee80211_mgmt *mgmt, size_t len)
2142 {
2143         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2144         u8 bssid[ETH_ALEN];
2145         u16 auth_alg, auth_transaction, status_code;
2146         struct sta_info *sta;
2147
2148         sdata_assert_lock(sdata);
2149
2150         if (len < 24 + 6)
2151                 return;
2152
2153         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2154                 return;
2155
2156         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2157
2158         if (!ether_addr_equal(bssid, mgmt->bssid))
2159                 return;
2160
2161         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2162         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2163         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2164
2165         if (auth_alg != ifmgd->auth_data->algorithm ||
2166             auth_transaction != ifmgd->auth_data->expected_transaction) {
2167                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2168                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2169                            auth_transaction,
2170                            ifmgd->auth_data->expected_transaction);
2171                 return;
2172         }
2173
2174         if (status_code != WLAN_STATUS_SUCCESS) {
2175                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2176                            mgmt->sa, status_code);
2177                 ieee80211_destroy_auth_data(sdata, false);
2178                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2179                 return;
2180         }
2181
2182         switch (ifmgd->auth_data->algorithm) {
2183         case WLAN_AUTH_OPEN:
2184         case WLAN_AUTH_LEAP:
2185         case WLAN_AUTH_FT:
2186         case WLAN_AUTH_SAE:
2187                 break;
2188         case WLAN_AUTH_SHARED_KEY:
2189                 if (ifmgd->auth_data->expected_transaction != 4) {
2190                         ieee80211_auth_challenge(sdata, mgmt, len);
2191                         /* need another frame */
2192                         return;
2193                 }
2194                 break;
2195         default:
2196                 WARN_ONCE(1, "invalid auth alg %d",
2197                           ifmgd->auth_data->algorithm);
2198                 return;
2199         }
2200
2201         sdata_info(sdata, "authenticated\n");
2202         ifmgd->auth_data->done = true;
2203         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2204         ifmgd->auth_data->timeout_started = true;
2205         run_again(sdata, ifmgd->auth_data->timeout);
2206
2207         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2208             ifmgd->auth_data->expected_transaction != 2) {
2209                 /*
2210                  * Report auth frame to user space for processing since another
2211                  * round of Authentication frames is still needed.
2212                  */
2213                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2214                 return;
2215         }
2216
2217         /* move station state to auth */
2218         mutex_lock(&sdata->local->sta_mtx);
2219         sta = sta_info_get(sdata, bssid);
2220         if (!sta) {
2221                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2222                 goto out_err;
2223         }
2224         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2225                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2226                 goto out_err;
2227         }
2228         mutex_unlock(&sdata->local->sta_mtx);
2229
2230         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2231         return;
2232  out_err:
2233         mutex_unlock(&sdata->local->sta_mtx);
2234         /* ignore frame -- wait for timeout */
2235 }
2236
2237
2238 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2239                                      struct ieee80211_mgmt *mgmt, size_t len)
2240 {
2241         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2242         const u8 *bssid = NULL;
2243         u16 reason_code;
2244
2245         sdata_assert_lock(sdata);
2246
2247         if (len < 24 + 2)
2248                 return;
2249
2250         if (!ifmgd->associated ||
2251             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2252                 return;
2253
2254         bssid = ifmgd->associated->bssid;
2255
2256         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2257
2258         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2259                    bssid, reason_code);
2260
2261         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2262
2263         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2264 }
2265
2266
2267 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2268                                        struct ieee80211_mgmt *mgmt, size_t len)
2269 {
2270         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2271         u16 reason_code;
2272
2273         sdata_assert_lock(sdata);
2274
2275         if (len < 24 + 2)
2276                 return;
2277
2278         if (!ifmgd->associated ||
2279             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2280                 return;
2281
2282         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2283
2284         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2285                    mgmt->sa, reason_code);
2286
2287         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2288
2289         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2290 }
2291
2292 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2293                                 u8 *supp_rates, unsigned int supp_rates_len,
2294                                 u32 *rates, u32 *basic_rates,
2295                                 bool *have_higher_than_11mbit,
2296                                 int *min_rate, int *min_rate_index,
2297                                 int shift, u32 rate_flags)
2298 {
2299         int i, j;
2300
2301         for (i = 0; i < supp_rates_len; i++) {
2302                 int rate = supp_rates[i] & 0x7f;
2303                 bool is_basic = !!(supp_rates[i] & 0x80);
2304
2305                 if ((rate * 5 * (1 << shift)) > 110)
2306                         *have_higher_than_11mbit = true;
2307
2308                 /*
2309                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2310                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2311                  *
2312                  * Note: Even through the membership selector and the basic
2313                  *       rate flag share the same bit, they are not exactly
2314                  *       the same.
2315                  */
2316                 if (!!(supp_rates[i] & 0x80) &&
2317                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2318                         continue;
2319
2320                 for (j = 0; j < sband->n_bitrates; j++) {
2321                         struct ieee80211_rate *br;
2322                         int brate;
2323
2324                         br = &sband->bitrates[j];
2325                         if ((rate_flags & br->flags) != rate_flags)
2326                                 continue;
2327
2328                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2329                         if (brate == rate) {
2330                                 *rates |= BIT(j);
2331                                 if (is_basic)
2332                                         *basic_rates |= BIT(j);
2333                                 if ((rate * 5) < *min_rate) {
2334                                         *min_rate = rate * 5;
2335                                         *min_rate_index = j;
2336                                 }
2337                                 break;
2338                         }
2339                 }
2340         }
2341 }
2342
2343 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2344                                          bool assoc)
2345 {
2346         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2347
2348         sdata_assert_lock(sdata);
2349
2350         if (!assoc) {
2351                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2352
2353                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2354                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2355                 sdata->u.mgd.flags = 0;
2356                 mutex_lock(&sdata->local->mtx);
2357                 ieee80211_vif_release_channel(sdata);
2358                 mutex_unlock(&sdata->local->mtx);
2359         }
2360
2361         kfree(assoc_data);
2362         sdata->u.mgd.assoc_data = NULL;
2363 }
2364
2365 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2366                                     struct cfg80211_bss *cbss,
2367                                     struct ieee80211_mgmt *mgmt, size_t len)
2368 {
2369         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2370         struct ieee80211_local *local = sdata->local;
2371         struct ieee80211_supported_band *sband;
2372         struct sta_info *sta;
2373         u8 *pos;
2374         u16 capab_info, aid;
2375         struct ieee802_11_elems elems;
2376         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2377         const struct cfg80211_bss_ies *bss_ies = NULL;
2378         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2379         u32 changed = 0;
2380         int err;
2381         bool ret;
2382
2383         /* AssocResp and ReassocResp have identical structure */
2384
2385         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2386         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2387
2388         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2389                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2390                            aid);
2391         aid &= ~(BIT(15) | BIT(14));
2392
2393         ifmgd->broken_ap = false;
2394
2395         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2396                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2397                            aid);
2398                 aid = 0;
2399                 ifmgd->broken_ap = true;
2400         }
2401
2402         pos = mgmt->u.assoc_resp.variable;
2403         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2404
2405         if (!elems.supp_rates) {
2406                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2407                 return false;
2408         }
2409
2410         ifmgd->aid = aid;
2411
2412         /*
2413          * Some APs are erroneously not including some information in their
2414          * (re)association response frames. Try to recover by using the data
2415          * from the beacon or probe response. This seems to afflict mobile
2416          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2417          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2418          */
2419         if ((assoc_data->wmm && !elems.wmm_param) ||
2420             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2421              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2422             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2423              (!elems.vht_cap_elem || !elems.vht_operation))) {
2424                 const struct cfg80211_bss_ies *ies;
2425                 struct ieee802_11_elems bss_elems;
2426
2427                 rcu_read_lock();
2428                 ies = rcu_dereference(cbss->ies);
2429                 if (ies)
2430                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2431                                           GFP_ATOMIC);
2432                 rcu_read_unlock();
2433                 if (!bss_ies)
2434                         return false;
2435
2436                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2437                                        false, &bss_elems);
2438                 if (assoc_data->wmm &&
2439                     !elems.wmm_param && bss_elems.wmm_param) {
2440                         elems.wmm_param = bss_elems.wmm_param;
2441                         sdata_info(sdata,
2442                                    "AP bug: WMM param missing from AssocResp\n");
2443                 }
2444
2445                 /*
2446                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2447                  * have to include the IEs in the (re)association response.
2448                  */
2449                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2450                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2451                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2452                         sdata_info(sdata,
2453                                    "AP bug: HT capability missing from AssocResp\n");
2454                 }
2455                 if (!elems.ht_operation && bss_elems.ht_operation &&
2456                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2457                         elems.ht_operation = bss_elems.ht_operation;
2458                         sdata_info(sdata,
2459                                    "AP bug: HT operation missing from AssocResp\n");
2460                 }
2461                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2462                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2463                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2464                         sdata_info(sdata,
2465                                    "AP bug: VHT capa missing from AssocResp\n");
2466                 }
2467                 if (!elems.vht_operation && bss_elems.vht_operation &&
2468                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2469                         elems.vht_operation = bss_elems.vht_operation;
2470                         sdata_info(sdata,
2471                                    "AP bug: VHT operation missing from AssocResp\n");
2472                 }
2473         }
2474
2475         /*
2476          * We previously checked these in the beacon/probe response, so
2477          * they should be present here. This is just a safety net.
2478          */
2479         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2480             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2481                 sdata_info(sdata,
2482                            "HT AP is missing WMM params or HT capability/operation\n");
2483                 ret = false;
2484                 goto out;
2485         }
2486
2487         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2488             (!elems.vht_cap_elem || !elems.vht_operation)) {
2489                 sdata_info(sdata,
2490                            "VHT AP is missing VHT capability/operation\n");
2491                 ret = false;
2492                 goto out;
2493         }
2494
2495         mutex_lock(&sdata->local->sta_mtx);
2496         /*
2497          * station info was already allocated and inserted before
2498          * the association and should be available to us
2499          */
2500         sta = sta_info_get(sdata, cbss->bssid);
2501         if (WARN_ON(!sta)) {
2502                 mutex_unlock(&sdata->local->sta_mtx);
2503                 ret = false;
2504                 goto out;
2505         }
2506
2507         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2508
2509         /* Set up internal HT/VHT capabilities */
2510         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2511                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2512                                                   elems.ht_cap_elem, sta);
2513
2514         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2515                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2516                                                     elems.vht_cap_elem, sta);
2517
2518         /*
2519          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2520          * in their association response, so ignore that data for our own
2521          * configuration. If it changed since the last beacon, we'll get the
2522          * next beacon and update then.
2523          */
2524
2525         /*
2526          * If an operating mode notification IE is present, override the
2527          * NSS calculation (that would be done in rate_control_rate_init())
2528          * and use the # of streams from that element.
2529          */
2530         if (elems.opmode_notif &&
2531             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2532                 u8 nss;
2533
2534                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2535                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2536                 nss += 1;
2537                 sta->sta.rx_nss = nss;
2538         }
2539
2540         rate_control_rate_init(sta);
2541
2542         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2543                 set_sta_flag(sta, WLAN_STA_MFP);
2544
2545         if (elems.wmm_param)
2546                 set_sta_flag(sta, WLAN_STA_WME);
2547
2548         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2549         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2550                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2551         if (err) {
2552                 sdata_info(sdata,
2553                            "failed to move station %pM to desired state\n",
2554                            sta->sta.addr);
2555                 WARN_ON(__sta_info_destroy(sta));
2556                 mutex_unlock(&sdata->local->sta_mtx);
2557                 ret = false;
2558                 goto out;
2559         }
2560
2561         mutex_unlock(&sdata->local->sta_mtx);
2562
2563         /*
2564          * Always handle WMM once after association regardless
2565          * of the first value the AP uses. Setting -1 here has
2566          * that effect because the AP values is an unsigned
2567          * 4-bit value.
2568          */
2569         ifmgd->wmm_last_param_set = -1;
2570
2571         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2572                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2573                                          elems.wmm_param_len);
2574         else
2575                 ieee80211_set_wmm_default(sdata, false);
2576         changed |= BSS_CHANGED_QOS;
2577
2578         /* set AID and assoc capability,
2579          * ieee80211_set_associated() will tell the driver */
2580         bss_conf->aid = aid;
2581         bss_conf->assoc_capability = capab_info;
2582         ieee80211_set_associated(sdata, cbss, changed);
2583
2584         /*
2585          * If we're using 4-addr mode, let the AP know that we're
2586          * doing so, so that it can create the STA VLAN on its side
2587          */
2588         if (ifmgd->use_4addr)
2589                 ieee80211_send_4addr_nullfunc(local, sdata);
2590
2591         /*
2592          * Start timer to probe the connection to the AP now.
2593          * Also start the timer that will detect beacon loss.
2594          */
2595         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2596         ieee80211_sta_reset_beacon_monitor(sdata);
2597
2598         ret = true;
2599  out:
2600         kfree(bss_ies);
2601         return ret;
2602 }
2603
2604 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2605                                          struct ieee80211_mgmt *mgmt,
2606                                          size_t len)
2607 {
2608         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2609         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2610         u16 capab_info, status_code, aid;
2611         struct ieee802_11_elems elems;
2612         u8 *pos;
2613         bool reassoc;
2614         struct cfg80211_bss *bss;
2615
2616         sdata_assert_lock(sdata);
2617
2618         if (!assoc_data)
2619                 return;
2620         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2621                 return;
2622
2623         /*
2624          * AssocResp and ReassocResp have identical structure, so process both
2625          * of them in this function.
2626          */
2627
2628         if (len < 24 + 6)
2629                 return;
2630
2631         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2632         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2633         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2634         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2635
2636         sdata_info(sdata,
2637                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2638                    reassoc ? "Rea" : "A", mgmt->sa,
2639                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2640
2641         pos = mgmt->u.assoc_resp.variable;
2642         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2643
2644         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2645             elems.timeout_int &&
2646             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2647                 u32 tu, ms;
2648                 tu = le32_to_cpu(elems.timeout_int->value);
2649                 ms = tu * 1024 / 1000;
2650                 sdata_info(sdata,
2651                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2652                            mgmt->sa, tu, ms);
2653                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2654                 assoc_data->timeout_started = true;
2655                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2656                         run_again(sdata, assoc_data->timeout);
2657                 return;
2658         }
2659
2660         bss = assoc_data->bss;
2661
2662         if (status_code != WLAN_STATUS_SUCCESS) {
2663                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2664                            mgmt->sa, status_code);
2665                 ieee80211_destroy_assoc_data(sdata, false);
2666         } else {
2667                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2668                         /* oops -- internal error -- send timeout for now */
2669                         ieee80211_destroy_assoc_data(sdata, false);
2670                         cfg80211_assoc_timeout(sdata->dev, bss);
2671                         return;
2672                 }
2673                 sdata_info(sdata, "associated\n");
2674
2675                 /*
2676                  * destroy assoc_data afterwards, as otherwise an idle
2677                  * recalc after assoc_data is NULL but before associated
2678                  * is set can cause the interface to go idle
2679                  */
2680                 ieee80211_destroy_assoc_data(sdata, true);
2681         }
2682
2683         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
2684 }
2685
2686 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2687                                   struct ieee80211_mgmt *mgmt, size_t len,
2688                                   struct ieee80211_rx_status *rx_status,
2689                                   struct ieee802_11_elems *elems)
2690 {
2691         struct ieee80211_local *local = sdata->local;
2692         int freq;
2693         struct ieee80211_bss *bss;
2694         struct ieee80211_channel *channel;
2695
2696         sdata_assert_lock(sdata);
2697
2698         if (elems->ds_params)
2699                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2700                                                       rx_status->band);
2701         else
2702                 freq = rx_status->freq;
2703
2704         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2705
2706         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2707                 return;
2708
2709         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2710                                         channel);
2711         if (bss) {
2712                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2713                 ieee80211_rx_bss_put(local, bss);
2714         }
2715 }
2716
2717
2718 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2719                                          struct sk_buff *skb)
2720 {
2721         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2722         struct ieee80211_if_managed *ifmgd;
2723         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2724         size_t baselen, len = skb->len;
2725         struct ieee802_11_elems elems;
2726
2727         ifmgd = &sdata->u.mgd;
2728
2729         sdata_assert_lock(sdata);
2730
2731         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2732                 return; /* ignore ProbeResp to foreign address */
2733
2734         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2735         if (baselen > len)
2736                 return;
2737
2738         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2739                                false, &elems);
2740
2741         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2742
2743         if (ifmgd->associated &&
2744             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2745                 ieee80211_reset_ap_probe(sdata);
2746
2747         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2748             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2749                 /* got probe response, continue with auth */
2750                 sdata_info(sdata, "direct probe responded\n");
2751                 ifmgd->auth_data->tries = 0;
2752                 ifmgd->auth_data->timeout = jiffies;
2753                 ifmgd->auth_data->timeout_started = true;
2754                 run_again(sdata, ifmgd->auth_data->timeout);
2755         }
2756 }
2757
2758 /*
2759  * This is the canonical list of information elements we care about,
2760  * the filter code also gives us all changes to the Microsoft OUI
2761  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2762  *
2763  * We implement beacon filtering in software since that means we can
2764  * avoid processing the frame here and in cfg80211, and userspace
2765  * will not be able to tell whether the hardware supports it or not.
2766  *
2767  * XXX: This list needs to be dynamic -- userspace needs to be able to
2768  *      add items it requires. It also needs to be able to tell us to
2769  *      look out for other vendor IEs.
2770  */
2771 static const u64 care_about_ies =
2772         (1ULL << WLAN_EID_COUNTRY) |
2773         (1ULL << WLAN_EID_ERP_INFO) |
2774         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2775         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2776         (1ULL << WLAN_EID_HT_CAPABILITY) |
2777         (1ULL << WLAN_EID_HT_OPERATION);
2778
2779 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2780                                      struct ieee80211_mgmt *mgmt, size_t len,
2781                                      struct ieee80211_rx_status *rx_status)
2782 {
2783         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2784         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2785         size_t baselen;
2786         struct ieee802_11_elems elems;
2787         struct ieee80211_local *local = sdata->local;
2788         struct ieee80211_chanctx_conf *chanctx_conf;
2789         struct ieee80211_channel *chan;
2790         struct sta_info *sta;
2791         u32 changed = 0;
2792         bool erp_valid;
2793         u8 erp_value = 0;
2794         u32 ncrc;
2795         u8 *bssid;
2796         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2797
2798         sdata_assert_lock(sdata);
2799
2800         /* Process beacon from the current BSS */
2801         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2802         if (baselen > len)
2803                 return;
2804
2805         rcu_read_lock();
2806         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2807         if (!chanctx_conf) {
2808                 rcu_read_unlock();
2809                 return;
2810         }
2811
2812         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2813                 rcu_read_unlock();
2814                 return;
2815         }
2816         chan = chanctx_conf->def.chan;
2817         rcu_read_unlock();
2818
2819         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2820             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2821                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2822                                        len - baselen, false, &elems);
2823
2824                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2825                 if (elems.tim && !elems.parse_error) {
2826                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
2827                         ifmgd->dtim_period = tim_ie->dtim_period;
2828                 }
2829                 ifmgd->have_beacon = true;
2830                 ifmgd->assoc_data->need_beacon = false;
2831                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2832                         sdata->vif.bss_conf.sync_tsf =
2833                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2834                         sdata->vif.bss_conf.sync_device_ts =
2835                                 rx_status->device_timestamp;
2836                         if (elems.tim)
2837                                 sdata->vif.bss_conf.sync_dtim_count =
2838                                         elems.tim->dtim_count;
2839                         else
2840                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2841                 }
2842                 /* continue assoc process */
2843                 ifmgd->assoc_data->timeout = jiffies;
2844                 ifmgd->assoc_data->timeout_started = true;
2845                 run_again(sdata, ifmgd->assoc_data->timeout);
2846                 return;
2847         }
2848
2849         if (!ifmgd->associated ||
2850             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2851                 return;
2852         bssid = ifmgd->associated->bssid;
2853
2854         /* Track average RSSI from the Beacon frames of the current AP */
2855         ifmgd->last_beacon_signal = rx_status->signal;
2856         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2857                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2858                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2859                 ifmgd->last_cqm_event_signal = 0;
2860                 ifmgd->count_beacon_signal = 1;
2861                 ifmgd->last_ave_beacon_signal = 0;
2862         } else {
2863                 ifmgd->ave_beacon_signal =
2864                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2865                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2866                          ifmgd->ave_beacon_signal) / 16;
2867                 ifmgd->count_beacon_signal++;
2868         }
2869
2870         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2871             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2872                 int sig = ifmgd->ave_beacon_signal;
2873                 int last_sig = ifmgd->last_ave_beacon_signal;
2874
2875                 /*
2876                  * if signal crosses either of the boundaries, invoke callback
2877                  * with appropriate parameters
2878                  */
2879                 if (sig > ifmgd->rssi_max_thold &&
2880                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2881                         ifmgd->last_ave_beacon_signal = sig;
2882                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2883                 } else if (sig < ifmgd->rssi_min_thold &&
2884                            (last_sig >= ifmgd->rssi_max_thold ||
2885                            last_sig == 0)) {
2886                         ifmgd->last_ave_beacon_signal = sig;
2887                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2888                 }
2889         }
2890
2891         if (bss_conf->cqm_rssi_thold &&
2892             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2893             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2894                 int sig = ifmgd->ave_beacon_signal / 16;
2895                 int last_event = ifmgd->last_cqm_event_signal;
2896                 int thold = bss_conf->cqm_rssi_thold;
2897                 int hyst = bss_conf->cqm_rssi_hyst;
2898                 if (sig < thold &&
2899                     (last_event == 0 || sig < last_event - hyst)) {
2900                         ifmgd->last_cqm_event_signal = sig;
2901                         ieee80211_cqm_rssi_notify(
2902                                 &sdata->vif,
2903                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2904                                 GFP_KERNEL);
2905                 } else if (sig > thold &&
2906                            (last_event == 0 || sig > last_event + hyst)) {
2907                         ifmgd->last_cqm_event_signal = sig;
2908                         ieee80211_cqm_rssi_notify(
2909                                 &sdata->vif,
2910                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2911                                 GFP_KERNEL);
2912                 }
2913         }
2914
2915         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
2916                 mlme_dbg_ratelimited(sdata,
2917                                      "cancelling AP probe due to a received beacon\n");
2918                 ieee80211_reset_ap_probe(sdata);
2919         }
2920
2921         /*
2922          * Push the beacon loss detection into the future since
2923          * we are processing a beacon from the AP just now.
2924          */
2925         ieee80211_sta_reset_beacon_monitor(sdata);
2926
2927         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2928         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2929                                           len - baselen, false, &elems,
2930                                           care_about_ies, ncrc);
2931
2932         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2933                 bool directed_tim = ieee80211_check_tim(elems.tim,
2934                                                         elems.tim_len,
2935                                                         ifmgd->aid);
2936                 if (directed_tim) {
2937                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2938                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2939                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2940                                         ieee80211_hw_config(local,
2941                                                             IEEE80211_CONF_CHANGE_PS);
2942                                 }
2943                                 ieee80211_send_nullfunc(local, sdata, 0);
2944                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2945                                 local->pspolling = true;
2946
2947                                 /*
2948                                  * Here is assumed that the driver will be
2949                                  * able to send ps-poll frame and receive a
2950                                  * response even though power save mode is
2951                                  * enabled, but some drivers might require
2952                                  * to disable power save here. This needs
2953                                  * to be investigated.
2954                                  */
2955                                 ieee80211_send_pspoll(local, sdata);
2956                         }
2957                 }
2958         }
2959
2960         if (sdata->vif.p2p) {
2961                 struct ieee80211_p2p_noa_attr noa = {};
2962                 int ret;
2963
2964                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
2965                                             len - baselen,
2966                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2967                                             (u8 *) &noa, sizeof(noa));
2968                 if (ret >= 2) {
2969                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
2970                                 /* valid noa_attr and index changed */
2971                                 sdata->u.mgd.p2p_noa_index = noa.index;
2972                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
2973                                 changed |= BSS_CHANGED_P2P_PS;
2974                                 /*
2975                                  * make sure we update all information, the CRC
2976                                  * mechanism doesn't look at P2P attributes.
2977                                  */
2978                                 ifmgd->beacon_crc_valid = false;
2979                         }
2980                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
2981                         /* noa_attr not found and we had valid noa_attr before */
2982                         sdata->u.mgd.p2p_noa_index = -1;
2983                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
2984                         changed |= BSS_CHANGED_P2P_PS;
2985                         ifmgd->beacon_crc_valid = false;
2986                 }
2987         }
2988
2989         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2990                 return;
2991         ifmgd->beacon_crc = ncrc;
2992         ifmgd->beacon_crc_valid = true;
2993
2994         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2995
2996         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
2997                                          &elems, true);
2998
2999         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3000             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3001                                      elems.wmm_param_len))
3002                 changed |= BSS_CHANGED_QOS;
3003
3004         /*
3005          * If we haven't had a beacon before, tell the driver about the
3006          * DTIM period (and beacon timing if desired) now.
3007          */
3008         if (!ifmgd->have_beacon) {
3009                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3010                 if (elems.tim)
3011                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3012                 else
3013                         bss_conf->dtim_period = 1;
3014
3015                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3016                         sdata->vif.bss_conf.sync_tsf =
3017                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3018                         sdata->vif.bss_conf.sync_device_ts =
3019                                 rx_status->device_timestamp;
3020                         if (elems.tim)
3021                                 sdata->vif.bss_conf.sync_dtim_count =
3022                                         elems.tim->dtim_count;
3023                         else
3024                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3025                 }
3026
3027                 changed |= BSS_CHANGED_BEACON_INFO;
3028                 ifmgd->have_beacon = true;
3029
3030                 mutex_lock(&local->iflist_mtx);
3031                 ieee80211_recalc_ps(local, -1);
3032                 mutex_unlock(&local->iflist_mtx);
3033
3034                 ieee80211_recalc_ps_vif(sdata);
3035         }
3036
3037         if (elems.erp_info) {
3038                 erp_valid = true;
3039                 erp_value = elems.erp_info[0];
3040         } else {
3041                 erp_valid = false;
3042         }
3043         changed |= ieee80211_handle_bss_capability(sdata,
3044                         le16_to_cpu(mgmt->u.beacon.capab_info),
3045                         erp_valid, erp_value);
3046
3047         mutex_lock(&local->sta_mtx);
3048         sta = sta_info_get(sdata, bssid);
3049
3050         if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3051                                 elems.vht_operation, bssid, &changed)) {
3052                 mutex_unlock(&local->sta_mtx);
3053                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3054                                        WLAN_REASON_DEAUTH_LEAVING,
3055                                        true, deauth_buf);
3056                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3057                                       sizeof(deauth_buf));
3058                 return;
3059         }
3060
3061         if (sta && elems.opmode_notif)
3062                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3063                                             rx_status->band, true);
3064         mutex_unlock(&local->sta_mtx);
3065
3066         if (elems.country_elem && elems.pwr_constr_elem &&
3067             mgmt->u.probe_resp.capab_info &
3068                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3069                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3070                                                        elems.country_elem,
3071                                                        elems.country_elem_len,
3072                                                        elems.pwr_constr_elem);
3073
3074         ieee80211_bss_info_change_notify(sdata, changed);
3075 }
3076
3077 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3078                                   struct sk_buff *skb)
3079 {
3080         struct ieee80211_rx_status *rx_status;
3081         struct ieee80211_mgmt *mgmt;
3082         u16 fc;
3083         struct ieee802_11_elems elems;
3084         int ies_len;
3085
3086         rx_status = (struct ieee80211_rx_status *) skb->cb;
3087         mgmt = (struct ieee80211_mgmt *) skb->data;
3088         fc = le16_to_cpu(mgmt->frame_control);
3089
3090         sdata_lock(sdata);
3091
3092         switch (fc & IEEE80211_FCTL_STYPE) {
3093         case IEEE80211_STYPE_BEACON:
3094                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3095                 break;
3096         case IEEE80211_STYPE_PROBE_RESP:
3097                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3098                 break;
3099         case IEEE80211_STYPE_AUTH:
3100                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3101                 break;
3102         case IEEE80211_STYPE_DEAUTH:
3103                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3104                 break;
3105         case IEEE80211_STYPE_DISASSOC:
3106                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3107                 break;
3108         case IEEE80211_STYPE_ASSOC_RESP:
3109         case IEEE80211_STYPE_REASSOC_RESP:
3110                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3111                 break;
3112         case IEEE80211_STYPE_ACTION:
3113                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3114                         ies_len = skb->len -
3115                                   offsetof(struct ieee80211_mgmt,
3116                                            u.action.u.chan_switch.variable);
3117
3118                         if (ies_len < 0)
3119                                 break;
3120
3121                         ieee802_11_parse_elems(
3122                                 mgmt->u.action.u.chan_switch.variable,
3123                                 ies_len, true, &elems);
3124
3125                         if (elems.parse_error)
3126                                 break;
3127
3128                         ieee80211_sta_process_chanswitch(sdata,
3129                                                          rx_status->mactime,
3130                                                          &elems, false);
3131                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3132                         ies_len = skb->len -
3133                                   offsetof(struct ieee80211_mgmt,
3134                                            u.action.u.ext_chan_switch.variable);
3135
3136                         if (ies_len < 0)
3137                                 break;
3138
3139                         ieee802_11_parse_elems(
3140                                 mgmt->u.action.u.ext_chan_switch.variable,
3141                                 ies_len, true, &elems);
3142
3143                         if (elems.parse_error)
3144                                 break;
3145
3146                         /* for the handling code pretend this was also an IE */
3147                         elems.ext_chansw_ie =
3148                                 &mgmt->u.action.u.ext_chan_switch.data;
3149
3150                         ieee80211_sta_process_chanswitch(sdata,
3151                                                          rx_status->mactime,
3152                                                          &elems, false);
3153                 }
3154                 break;
3155         }
3156         sdata_unlock(sdata);
3157 }
3158
3159 static void ieee80211_sta_timer(unsigned long data)
3160 {
3161         struct ieee80211_sub_if_data *sdata =
3162                 (struct ieee80211_sub_if_data *) data;
3163
3164         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3165 }
3166
3167 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3168                                           u8 *bssid, u8 reason, bool tx)
3169 {
3170         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3171
3172         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3173                                tx, frame_buf);
3174
3175         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3176                               IEEE80211_DEAUTH_FRAME_LEN);
3177 }
3178
3179 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3180 {
3181         struct ieee80211_local *local = sdata->local;
3182         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3183         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3184         u32 tx_flags = 0;
3185
3186         sdata_assert_lock(sdata);
3187
3188         if (WARN_ON_ONCE(!auth_data))
3189                 return -EINVAL;
3190
3191         auth_data->tries++;
3192
3193         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3194                 sdata_info(sdata, "authentication with %pM timed out\n",
3195                            auth_data->bss->bssid);
3196
3197                 /*
3198                  * Most likely AP is not in the range so remove the
3199                  * bss struct for that AP.
3200                  */
3201                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3202
3203                 return -ETIMEDOUT;
3204         }
3205
3206         drv_mgd_prepare_tx(local, sdata);
3207
3208         if (auth_data->bss->proberesp_ies) {
3209                 u16 trans = 1;
3210                 u16 status = 0;
3211
3212                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3213                            auth_data->bss->bssid, auth_data->tries,
3214                            IEEE80211_AUTH_MAX_TRIES);
3215
3216                 auth_data->expected_transaction = 2;
3217
3218                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3219                         trans = auth_data->sae_trans;
3220                         status = auth_data->sae_status;
3221                         auth_data->expected_transaction = trans;
3222                 }
3223
3224                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3225                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3226                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3227
3228                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3229                                     auth_data->data, auth_data->data_len,
3230                                     auth_data->bss->bssid,
3231                                     auth_data->bss->bssid, NULL, 0, 0,
3232                                     tx_flags);
3233         } else {
3234                 const u8 *ssidie;
3235
3236                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3237                            auth_data->bss->bssid, auth_data->tries,
3238                            IEEE80211_AUTH_MAX_TRIES);
3239
3240                 rcu_read_lock();
3241                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3242                 if (!ssidie) {
3243                         rcu_read_unlock();
3244                         return -EINVAL;
3245                 }
3246                 /*
3247                  * Direct probe is sent to broadcast address as some APs
3248                  * will not answer to direct packet in unassociated state.
3249                  */
3250                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3251                                          NULL, 0, (u32) -1, true, 0,
3252                                          auth_data->bss->channel, false);
3253                 rcu_read_unlock();
3254         }
3255
3256         if (tx_flags == 0) {
3257                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3258                 auth_data->timeout_started = true;
3259                 run_again(sdata, auth_data->timeout);
3260         } else {
3261                 auth_data->timeout =
3262                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3263                 auth_data->timeout_started = true;
3264                 run_again(sdata, auth_data->timeout);
3265         }
3266
3267         return 0;
3268 }
3269
3270 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3271 {
3272         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3273         struct ieee80211_local *local = sdata->local;
3274
3275         sdata_assert_lock(sdata);
3276
3277         assoc_data->tries++;
3278         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3279                 sdata_info(sdata, "association with %pM timed out\n",
3280                            assoc_data->bss->bssid);
3281
3282                 /*
3283                  * Most likely AP is not in the range so remove the
3284                  * bss struct for that AP.
3285                  */
3286                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3287
3288                 return -ETIMEDOUT;
3289         }
3290
3291         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3292                    assoc_data->bss->bssid, assoc_data->tries,
3293                    IEEE80211_ASSOC_MAX_TRIES);
3294         ieee80211_send_assoc(sdata);
3295
3296         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3297                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3298                 assoc_data->timeout_started = true;
3299                 run_again(sdata, assoc_data->timeout);
3300         } else {
3301                 assoc_data->timeout =
3302                         round_jiffies_up(jiffies +
3303                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3304                 assoc_data->timeout_started = true;
3305                 run_again(sdata, assoc_data->timeout);
3306         }
3307
3308         return 0;
3309 }
3310
3311 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3312                                   __le16 fc, bool acked)
3313 {
3314         struct ieee80211_local *local = sdata->local;
3315
3316         sdata->u.mgd.status_fc = fc;
3317         sdata->u.mgd.status_acked = acked;
3318         sdata->u.mgd.status_received = true;
3319
3320         ieee80211_queue_work(&local->hw, &sdata->work);
3321 }
3322
3323 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3324 {
3325         struct ieee80211_local *local = sdata->local;
3326         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3327
3328         sdata_lock(sdata);
3329
3330         if (ifmgd->status_received) {
3331                 __le16 fc = ifmgd->status_fc;
3332                 bool status_acked = ifmgd->status_acked;
3333
3334                 ifmgd->status_received = false;
3335                 if (ifmgd->auth_data &&
3336                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3337                         if (status_acked) {
3338                                 ifmgd->auth_data->timeout =
3339                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3340                                 run_again(sdata, ifmgd->auth_data->timeout);
3341                         } else {
3342                                 ifmgd->auth_data->timeout = jiffies - 1;
3343                         }
3344                         ifmgd->auth_data->timeout_started = true;
3345                 } else if (ifmgd->assoc_data &&
3346                            (ieee80211_is_assoc_req(fc) ||
3347                             ieee80211_is_reassoc_req(fc))) {
3348                         if (status_acked) {
3349                                 ifmgd->assoc_data->timeout =
3350                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3351                                 run_again(sdata, ifmgd->assoc_data->timeout);
3352                         } else {
3353                                 ifmgd->assoc_data->timeout = jiffies - 1;
3354                         }
3355                         ifmgd->assoc_data->timeout_started = true;
3356                 }
3357         }
3358
3359         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3360             time_after(jiffies, ifmgd->auth_data->timeout)) {
3361                 if (ifmgd->auth_data->done) {
3362                         /*
3363                          * ok ... we waited for assoc but userspace didn't,
3364                          * so let's just kill the auth data
3365                          */
3366                         ieee80211_destroy_auth_data(sdata, false);
3367                 } else if (ieee80211_probe_auth(sdata)) {
3368                         u8 bssid[ETH_ALEN];
3369
3370                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3371
3372                         ieee80211_destroy_auth_data(sdata, false);
3373
3374                         cfg80211_auth_timeout(sdata->dev, bssid);
3375                 }
3376         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3377                 run_again(sdata, ifmgd->auth_data->timeout);
3378
3379         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3380             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3381                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3382                     ieee80211_do_assoc(sdata)) {
3383                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3384
3385                         ieee80211_destroy_assoc_data(sdata, false);
3386                         cfg80211_assoc_timeout(sdata->dev, bss);
3387                 }
3388         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3389                 run_again(sdata, ifmgd->assoc_data->timeout);
3390
3391         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3392             ifmgd->associated) {
3393                 u8 bssid[ETH_ALEN];
3394                 int max_tries;
3395
3396                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3397
3398                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3399                         max_tries = max_nullfunc_tries;
3400                 else
3401                         max_tries = max_probe_tries;
3402
3403                 /* ACK received for nullfunc probing frame */
3404                 if (!ifmgd->probe_send_count)
3405                         ieee80211_reset_ap_probe(sdata);
3406                 else if (ifmgd->nullfunc_failed) {
3407                         if (ifmgd->probe_send_count < max_tries) {
3408                                 mlme_dbg(sdata,
3409                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3410                                          bssid, ifmgd->probe_send_count,
3411                                          max_tries);
3412                                 ieee80211_mgd_probe_ap_send(sdata);
3413                         } else {
3414                                 mlme_dbg(sdata,
3415                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3416                                          bssid);
3417                                 ieee80211_sta_connection_lost(sdata, bssid,
3418                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3419                                         false);
3420                         }
3421                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3422                         run_again(sdata, ifmgd->probe_timeout);
3423                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3424                         mlme_dbg(sdata,
3425                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3426                                  bssid, probe_wait_ms);
3427                         ieee80211_sta_connection_lost(sdata, bssid,
3428                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3429                 } else if (ifmgd->probe_send_count < max_tries) {
3430                         mlme_dbg(sdata,
3431                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3432                                  bssid, probe_wait_ms,
3433                                  ifmgd->probe_send_count, max_tries);
3434                         ieee80211_mgd_probe_ap_send(sdata);
3435                 } else {
3436                         /*
3437                          * We actually lost the connection ... or did we?
3438                          * Let's make sure!
3439                          */
3440                         wiphy_debug(local->hw.wiphy,
3441                                     "%s: No probe response from AP %pM"
3442                                     " after %dms, disconnecting.\n",
3443                                     sdata->name,
3444                                     bssid, probe_wait_ms);
3445
3446                         ieee80211_sta_connection_lost(sdata, bssid,
3447                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3448                 }
3449         }
3450
3451         sdata_unlock(sdata);
3452 }
3453
3454 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3455 {
3456         struct ieee80211_sub_if_data *sdata =
3457                 (struct ieee80211_sub_if_data *) data;
3458         struct ieee80211_local *local = sdata->local;
3459
3460         if (local->quiescing)
3461                 return;
3462
3463         sdata->u.mgd.connection_loss = false;
3464         ieee80211_queue_work(&sdata->local->hw,
3465                              &sdata->u.mgd.beacon_connection_loss_work);
3466 }
3467
3468 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3469 {
3470         struct ieee80211_sub_if_data *sdata =
3471                 (struct ieee80211_sub_if_data *) data;
3472         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3473         struct ieee80211_local *local = sdata->local;
3474
3475         if (local->quiescing)
3476                 return;
3477
3478         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3479 }
3480
3481 static void ieee80211_sta_monitor_work(struct work_struct *work)
3482 {
3483         struct ieee80211_sub_if_data *sdata =
3484                 container_of(work, struct ieee80211_sub_if_data,
3485                              u.mgd.monitor_work);
3486
3487         ieee80211_mgd_probe_ap(sdata, false);
3488 }
3489
3490 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3491 {
3492         u32 flags;
3493
3494         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3495                 __ieee80211_stop_poll(sdata);
3496
3497                 /* let's probe the connection once */
3498                 flags = sdata->local->hw.flags;
3499                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3500                         ieee80211_queue_work(&sdata->local->hw,
3501                                              &sdata->u.mgd.monitor_work);
3502                 /* and do all the other regular work too */
3503                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3504         }
3505 }
3506
3507 #ifdef CONFIG_PM
3508 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3509 {
3510         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3511         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3512
3513         sdata_lock(sdata);
3514
3515         if (ifmgd->auth_data || ifmgd->assoc_data) {
3516                 const u8 *bssid = ifmgd->auth_data ?
3517                                 ifmgd->auth_data->bss->bssid :
3518                                 ifmgd->assoc_data->bss->bssid;
3519
3520                 /*
3521                  * If we are trying to authenticate / associate while suspending,
3522                  * cfg80211 won't know and won't actually abort those attempts,
3523                  * thus we need to do that ourselves.
3524                  */
3525                 ieee80211_send_deauth_disassoc(sdata, bssid,
3526                                                IEEE80211_STYPE_DEAUTH,
3527                                                WLAN_REASON_DEAUTH_LEAVING,
3528                                                false, frame_buf);
3529                 if (ifmgd->assoc_data)
3530                         ieee80211_destroy_assoc_data(sdata, false);
3531                 if (ifmgd->auth_data)
3532                         ieee80211_destroy_auth_data(sdata, false);
3533                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3534                                       IEEE80211_DEAUTH_FRAME_LEN);
3535         }
3536
3537         sdata_unlock(sdata);
3538 }
3539
3540 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3541 {
3542         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3543
3544         sdata_lock(sdata);
3545         if (!ifmgd->associated) {
3546                 sdata_unlock(sdata);
3547                 return;
3548         }
3549
3550         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3551                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3552                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3553                 ieee80211_sta_connection_lost(sdata,
3554                                               ifmgd->associated->bssid,
3555                                               WLAN_REASON_UNSPECIFIED,
3556                                               true);
3557                 sdata_unlock(sdata);
3558                 return;
3559         }
3560         sdata_unlock(sdata);
3561 }
3562 #endif
3563
3564 /* interface setup */
3565 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3566 {
3567         struct ieee80211_if_managed *ifmgd;
3568
3569         ifmgd = &sdata->u.mgd;
3570         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3571         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3572         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3573                   ieee80211_beacon_connection_loss_work);
3574         INIT_WORK(&ifmgd->csa_connection_drop_work,
3575                   ieee80211_csa_connection_drop_work);
3576         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3577         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3578                     (unsigned long) sdata);
3579         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3580                     (unsigned long) sdata);
3581         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3582                     (unsigned long) sdata);
3583         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3584                     (unsigned long) sdata);
3585
3586         ifmgd->flags = 0;
3587         ifmgd->powersave = sdata->wdev.ps;
3588         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3589         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3590         ifmgd->p2p_noa_index = -1;
3591
3592         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3593                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3594         else
3595                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3596 }
3597
3598 /* scan finished notification */
3599 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3600 {
3601         struct ieee80211_sub_if_data *sdata;
3602
3603         /* Restart STA timers */
3604         rcu_read_lock();
3605         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3606                 if (ieee80211_sdata_running(sdata))
3607                         ieee80211_restart_sta_timer(sdata);
3608         }
3609         rcu_read_unlock();
3610 }
3611
3612 int ieee80211_max_network_latency(struct notifier_block *nb,
3613                                   unsigned long data, void *dummy)
3614 {
3615         s32 latency_usec = (s32) data;
3616         struct ieee80211_local *local =
3617                 container_of(nb, struct ieee80211_local,
3618                              network_latency_notifier);
3619
3620         mutex_lock(&local->iflist_mtx);
3621         ieee80211_recalc_ps(local, latency_usec);
3622         mutex_unlock(&local->iflist_mtx);
3623
3624         return 0;
3625 }
3626
3627 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3628                                      struct cfg80211_bss *cbss)
3629 {
3630         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3631         const u8 *ht_cap_ie, *vht_cap_ie;
3632         const struct ieee80211_ht_cap *ht_cap;
3633         const struct ieee80211_vht_cap *vht_cap;
3634         u8 chains = 1;
3635
3636         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3637                 return chains;
3638
3639         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3640         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3641                 ht_cap = (void *)(ht_cap_ie + 2);
3642                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3643                 /*
3644                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3645                  *       "Tx Unequal Modulation Supported" fields.
3646                  */
3647         }
3648
3649         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3650                 return chains;
3651
3652         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3653         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3654                 u8 nss;
3655                 u16 tx_mcs_map;
3656
3657                 vht_cap = (void *)(vht_cap_ie + 2);
3658                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3659                 for (nss = 8; nss > 0; nss--) {
3660                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3661                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3662                                 break;
3663                 }
3664                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3665                 chains = max(chains, nss);
3666         }
3667
3668         return chains;
3669 }
3670
3671 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3672                                   struct cfg80211_bss *cbss)
3673 {
3674         struct ieee80211_local *local = sdata->local;
3675         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3676         const struct ieee80211_ht_operation *ht_oper = NULL;
3677         const struct ieee80211_vht_operation *vht_oper = NULL;
3678         struct ieee80211_supported_band *sband;
3679         struct cfg80211_chan_def chandef;
3680         int ret;
3681
3682         sband = local->hw.wiphy->bands[cbss->channel->band];
3683
3684         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3685                           IEEE80211_STA_DISABLE_80P80MHZ |
3686                           IEEE80211_STA_DISABLE_160MHZ);
3687
3688         rcu_read_lock();
3689
3690         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3691             sband->ht_cap.ht_supported) {
3692                 const u8 *ht_oper_ie, *ht_cap;
3693
3694                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3695                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3696                         ht_oper = (void *)(ht_oper_ie + 2);
3697
3698                 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3699                 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3700                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3701                         ht_oper = NULL;
3702                 }
3703         }
3704
3705         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3706             sband->vht_cap.vht_supported) {
3707                 const u8 *vht_oper_ie, *vht_cap;
3708
3709                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3710                                                    WLAN_EID_VHT_OPERATION);
3711                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3712                         vht_oper = (void *)(vht_oper_ie + 2);
3713                 if (vht_oper && !ht_oper) {
3714                         vht_oper = NULL;
3715                         sdata_info(sdata,
3716                                    "AP advertised VHT without HT, disabling both\n");
3717                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3718                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3719                 }
3720
3721                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3722                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3723                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3724                         vht_oper = NULL;
3725                 }
3726         }
3727
3728         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3729                                                      cbss->channel,
3730                                                      ht_oper, vht_oper,
3731                                                      &chandef, false);
3732
3733         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3734                                       local->rx_chains);
3735
3736         rcu_read_unlock();
3737
3738         /* will change later if needed */
3739         sdata->smps_mode = IEEE80211_SMPS_OFF;
3740
3741         mutex_lock(&local->mtx);
3742         /*
3743          * If this fails (possibly due to channel context sharing
3744          * on incompatible channels, e.g. 80+80 and 160 sharing the
3745          * same control channel) try to use a smaller bandwidth.
3746          */
3747         ret = ieee80211_vif_use_channel(sdata, &chandef,
3748                                         IEEE80211_CHANCTX_SHARED);
3749
3750         /* don't downgrade for 5 and 10 MHz channels, though. */
3751         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3752             chandef.width == NL80211_CHAN_WIDTH_10)
3753                 goto out;
3754
3755         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3756                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3757                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3758                                                 IEEE80211_CHANCTX_SHARED);
3759         }
3760  out:
3761         mutex_unlock(&local->mtx);
3762         return ret;
3763 }
3764
3765 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3766                                      struct cfg80211_bss *cbss, bool assoc)
3767 {
3768         struct ieee80211_local *local = sdata->local;
3769         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3770         struct ieee80211_bss *bss = (void *)cbss->priv;
3771         struct sta_info *new_sta = NULL;
3772         bool have_sta = false;
3773         int err;
3774
3775         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3776                 return -EINVAL;
3777
3778         if (assoc) {
3779                 rcu_read_lock();
3780                 have_sta = sta_info_get(sdata, cbss->bssid);
3781                 rcu_read_unlock();
3782         }
3783
3784         if (!have_sta) {
3785                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3786                 if (!new_sta)
3787                         return -ENOMEM;
3788         }
3789         if (new_sta) {
3790                 u32 rates = 0, basic_rates = 0;
3791                 bool have_higher_than_11mbit;
3792                 int min_rate = INT_MAX, min_rate_index = -1;
3793                 struct ieee80211_chanctx_conf *chanctx_conf;
3794                 struct ieee80211_supported_band *sband;
3795                 const struct cfg80211_bss_ies *ies;
3796                 int shift;
3797                 u32 rate_flags;
3798
3799                 sband = local->hw.wiphy->bands[cbss->channel->band];
3800
3801                 err = ieee80211_prep_channel(sdata, cbss);
3802                 if (err) {
3803                         sta_info_free(local, new_sta);
3804                         return -EINVAL;
3805                 }
3806                 shift = ieee80211_vif_get_shift(&sdata->vif);
3807
3808                 rcu_read_lock();
3809                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3810                 if (WARN_ON(!chanctx_conf)) {
3811                         rcu_read_unlock();
3812                         sta_info_free(local, new_sta);
3813                         return -EINVAL;
3814                 }
3815                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
3816                 rcu_read_unlock();
3817
3818                 ieee80211_get_rates(sband, bss->supp_rates,
3819                                     bss->supp_rates_len,
3820                                     &rates, &basic_rates,
3821                                     &have_higher_than_11mbit,
3822                                     &min_rate, &min_rate_index,
3823                                     shift, rate_flags);
3824
3825                 /*
3826                  * This used to be a workaround for basic rates missing
3827                  * in the association response frame. Now that we no
3828                  * longer use the basic rates from there, it probably
3829                  * doesn't happen any more, but keep the workaround so
3830                  * in case some *other* APs are buggy in different ways
3831                  * we can connect -- with a warning.
3832                  */
3833                 if (!basic_rates && min_rate_index >= 0) {
3834                         sdata_info(sdata,
3835                                    "No basic rates, using min rate instead\n");
3836                         basic_rates = BIT(min_rate_index);
3837                 }
3838
3839                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3840                 sdata->vif.bss_conf.basic_rates = basic_rates;
3841
3842                 /* cf. IEEE 802.11 9.2.12 */
3843                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3844                     have_higher_than_11mbit)
3845                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3846                 else
3847                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3848
3849                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3850
3851                 /* set timing information */
3852                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3853                 rcu_read_lock();
3854                 ies = rcu_dereference(cbss->beacon_ies);
3855                 if (ies) {
3856                         const u8 *tim_ie;
3857
3858                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3859                         sdata->vif.bss_conf.sync_device_ts =
3860                                 bss->device_ts_beacon;
3861                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3862                                                   ies->data, ies->len);
3863                         if (tim_ie && tim_ie[1] >= 2)
3864                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
3865                         else
3866                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3867                 } else if (!(local->hw.flags &
3868                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
3869                         ies = rcu_dereference(cbss->proberesp_ies);
3870                         /* must be non-NULL since beacon IEs were NULL */
3871                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3872                         sdata->vif.bss_conf.sync_device_ts =
3873                                 bss->device_ts_presp;
3874                         sdata->vif.bss_conf.sync_dtim_count = 0;
3875                 } else {
3876                         sdata->vif.bss_conf.sync_tsf = 0;
3877                         sdata->vif.bss_conf.sync_device_ts = 0;
3878                         sdata->vif.bss_conf.sync_dtim_count = 0;
3879                 }
3880                 rcu_read_unlock();
3881
3882                 /* tell driver about BSSID, basic rates and timing */
3883                 ieee80211_bss_info_change_notify(sdata,
3884                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3885                         BSS_CHANGED_BEACON_INT);
3886
3887                 if (assoc)
3888                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3889
3890                 err = sta_info_insert(new_sta);
3891                 new_sta = NULL;
3892                 if (err) {
3893                         sdata_info(sdata,
3894                                    "failed to insert STA entry for the AP (error %d)\n",
3895                                    err);
3896                         return err;
3897                 }
3898         } else
3899                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3900
3901         return 0;
3902 }
3903
3904 /* config hooks */
3905 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3906                        struct cfg80211_auth_request *req)
3907 {
3908         struct ieee80211_local *local = sdata->local;
3909         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3910         struct ieee80211_mgd_auth_data *auth_data;
3911         u16 auth_alg;
3912         int err;
3913
3914         /* prepare auth data structure */
3915
3916         switch (req->auth_type) {
3917         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3918                 auth_alg = WLAN_AUTH_OPEN;
3919                 break;
3920         case NL80211_AUTHTYPE_SHARED_KEY:
3921                 if (IS_ERR(local->wep_tx_tfm))
3922                         return -EOPNOTSUPP;
3923                 auth_alg = WLAN_AUTH_SHARED_KEY;
3924                 break;
3925         case NL80211_AUTHTYPE_FT:
3926                 auth_alg = WLAN_AUTH_FT;
3927                 break;
3928         case NL80211_AUTHTYPE_NETWORK_EAP:
3929                 auth_alg = WLAN_AUTH_LEAP;
3930                 break;
3931         case NL80211_AUTHTYPE_SAE:
3932                 auth_alg = WLAN_AUTH_SAE;
3933                 break;
3934         default:
3935                 return -EOPNOTSUPP;
3936         }
3937
3938         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3939                             req->ie_len, GFP_KERNEL);
3940         if (!auth_data)
3941                 return -ENOMEM;
3942
3943         auth_data->bss = req->bss;
3944
3945         if (req->sae_data_len >= 4) {
3946                 __le16 *pos = (__le16 *) req->sae_data;
3947                 auth_data->sae_trans = le16_to_cpu(pos[0]);
3948                 auth_data->sae_status = le16_to_cpu(pos[1]);
3949                 memcpy(auth_data->data, req->sae_data + 4,
3950                        req->sae_data_len - 4);
3951                 auth_data->data_len += req->sae_data_len - 4;
3952         }
3953
3954         if (req->ie && req->ie_len) {
3955                 memcpy(&auth_data->data[auth_data->data_len],
3956                        req->ie, req->ie_len);
3957                 auth_data->data_len += req->ie_len;
3958         }
3959
3960         if (req->key && req->key_len) {
3961                 auth_data->key_len = req->key_len;
3962                 auth_data->key_idx = req->key_idx;
3963                 memcpy(auth_data->key, req->key, req->key_len);
3964         }
3965
3966         auth_data->algorithm = auth_alg;
3967
3968         /* try to authenticate/probe */
3969
3970         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3971             ifmgd->assoc_data) {
3972                 err = -EBUSY;
3973                 goto err_free;
3974         }
3975
3976         if (ifmgd->auth_data)
3977                 ieee80211_destroy_auth_data(sdata, false);
3978
3979         /* prep auth_data so we don't go into idle on disassoc */
3980         ifmgd->auth_data = auth_data;
3981
3982         if (ifmgd->associated) {
3983                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3984
3985                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3986                                        WLAN_REASON_UNSPECIFIED,
3987                                        false, frame_buf);
3988
3989                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3990                                       sizeof(frame_buf));
3991         }
3992
3993         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3994
3995         err = ieee80211_prep_connection(sdata, req->bss, false);
3996         if (err)
3997                 goto err_clear;
3998
3999         err = ieee80211_probe_auth(sdata);
4000         if (err) {
4001                 sta_info_destroy_addr(sdata, req->bss->bssid);
4002                 goto err_clear;
4003         }
4004
4005         /* hold our own reference */
4006         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4007         return 0;
4008
4009  err_clear:
4010         memset(ifmgd->bssid, 0, ETH_ALEN);
4011         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4012         ifmgd->auth_data = NULL;
4013  err_free:
4014         kfree(auth_data);
4015         return err;
4016 }
4017
4018 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4019                                         const u8 *wmm_param, int len)
4020 {
4021         const u8 *pos;
4022         size_t left;
4023
4024         if (len < 8)
4025                 return false;
4026
4027         if (wmm_param[5] != 1 /* version */)
4028                 return false;
4029
4030         pos = wmm_param + 8;
4031         left = len - 8;
4032
4033         for (; left >= 4; left -= 4, pos += 4) {
4034                 u8 aifsn = pos[0] & 0x0f;
4035                 u8 ecwmin = pos[1] & 0x0f;
4036                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4037                 int aci = (pos[0] >> 5) & 0x03;
4038
4039                 if (aifsn < 2) {
4040                         sdata_info(sdata,
4041                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4042                                    aifsn, aci);
4043                         return false;
4044                 }
4045                 if (ecwmin > ecwmax) {
4046                         sdata_info(sdata,
4047                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4048                                    ecwmin, ecwmax, aci);
4049                         return false;
4050                 }
4051         }
4052
4053         return true;
4054 }
4055
4056 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4057                         struct cfg80211_assoc_request *req)
4058 {
4059         struct ieee80211_local *local = sdata->local;
4060         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4061         struct ieee80211_bss *bss = (void *)req->bss->priv;
4062         struct ieee80211_mgd_assoc_data *assoc_data;
4063         const struct cfg80211_bss_ies *beacon_ies;
4064         struct ieee80211_supported_band *sband;
4065         const u8 *ssidie, *ht_ie, *vht_ie;
4066         int i, err;
4067
4068         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4069         if (!assoc_data)
4070                 return -ENOMEM;
4071
4072         rcu_read_lock();
4073         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4074         if (!ssidie) {
4075                 rcu_read_unlock();
4076                 kfree(assoc_data);
4077                 return -EINVAL;
4078         }
4079         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4080         assoc_data->ssid_len = ssidie[1];
4081         rcu_read_unlock();
4082
4083         if (ifmgd->associated) {
4084                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4085
4086                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4087                                        WLAN_REASON_UNSPECIFIED,
4088                                        false, frame_buf);
4089
4090                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4091                                       sizeof(frame_buf));
4092         }
4093
4094         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4095                 err = -EBUSY;
4096                 goto err_free;
4097         }
4098
4099         if (ifmgd->assoc_data) {
4100                 err = -EBUSY;
4101                 goto err_free;
4102         }
4103
4104         if (ifmgd->auth_data) {
4105                 bool match;
4106
4107                 /* keep sta info, bssid if matching */
4108                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4109                 ieee80211_destroy_auth_data(sdata, match);
4110         }
4111
4112         /* prepare assoc data */
4113
4114         ifmgd->beacon_crc_valid = false;
4115
4116         assoc_data->wmm = bss->wmm_used &&
4117                           (local->hw.queues >= IEEE80211_NUM_ACS);
4118         if (assoc_data->wmm) {
4119                 /* try to check validity of WMM params IE */
4120                 const struct cfg80211_bss_ies *ies;
4121                 const u8 *wp, *start, *end;
4122
4123                 rcu_read_lock();
4124                 ies = rcu_dereference(req->bss->ies);
4125                 start = ies->data;
4126                 end = start + ies->len;
4127
4128                 while (true) {
4129                         wp = cfg80211_find_vendor_ie(
4130                                 WLAN_OUI_MICROSOFT,
4131                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4132                                 start, end - start);
4133                         if (!wp)
4134                                 break;
4135                         start = wp + wp[1] + 2;
4136                         /* if this IE is too short, try the next */
4137                         if (wp[1] <= 4)
4138                                 continue;
4139                         /* if this IE is WMM params, we found what we wanted */
4140                         if (wp[6] == 1)
4141                                 break;
4142                 }
4143
4144                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4145                                                         wp[1] - 2)) {
4146                         assoc_data->wmm = false;
4147                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4148                 }
4149                 rcu_read_unlock();
4150         }
4151
4152         /*
4153          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4154          * We still associate in non-HT mode (11a/b/g) if any one of these
4155          * ciphers is configured as pairwise.
4156          * We can set this to true for non-11n hardware, that'll be checked
4157          * separately along with the peer capabilities.
4158          */
4159         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4160                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4161                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4162                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4163                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4164                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4165                         netdev_info(sdata->dev,
4166                                     "disabling HT/VHT due to WEP/TKIP use\n");
4167                 }
4168         }
4169
4170         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4171                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4172                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4173         }
4174
4175         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4176                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4177
4178         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4179         sband = local->hw.wiphy->bands[req->bss->channel->band];
4180         if (!sband->ht_cap.ht_supported ||
4181             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4182             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4183                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4184                 if (!bss->wmm_used &&
4185                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4186                         netdev_info(sdata->dev,
4187                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4188         }
4189
4190         /* disable VHT if we don't support it or the AP doesn't use WMM */
4191         if (!sband->vht_cap.vht_supported ||
4192             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4193             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4194                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4195                 if (!bss->wmm_used &&
4196                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4197                         netdev_info(sdata->dev,
4198                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4199         }
4200
4201         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4202         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4203                sizeof(ifmgd->ht_capa_mask));
4204
4205         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4206         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4207                sizeof(ifmgd->vht_capa_mask));
4208
4209         if (req->ie && req->ie_len) {
4210                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4211                 assoc_data->ie_len = req->ie_len;
4212         }
4213
4214         assoc_data->bss = req->bss;
4215
4216         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4217                 if (ifmgd->powersave)
4218                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4219                 else
4220                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4221         } else
4222                 sdata->smps_mode = ifmgd->req_smps;
4223
4224         assoc_data->capability = req->bss->capability;
4225         assoc_data->supp_rates = bss->supp_rates;
4226         assoc_data->supp_rates_len = bss->supp_rates_len;
4227
4228         rcu_read_lock();
4229         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4230         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4231                 assoc_data->ap_ht_param =
4232                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4233         else
4234                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4235         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4236         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4237                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4238                        sizeof(struct ieee80211_vht_cap));
4239         else
4240                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4241         rcu_read_unlock();
4242
4243         if (bss->wmm_used && bss->uapsd_supported &&
4244             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4245                 assoc_data->uapsd = true;
4246                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4247         } else {
4248                 assoc_data->uapsd = false;
4249                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4250         }
4251
4252         if (req->prev_bssid)
4253                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4254
4255         if (req->use_mfp) {
4256                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4257                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4258         } else {
4259                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4260                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4261         }
4262
4263         if (req->crypto.control_port)
4264                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4265         else
4266                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4267
4268         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4269         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4270         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4271                                                         sdata->vif.type);
4272
4273         /* kick off associate process */
4274
4275         ifmgd->assoc_data = assoc_data;
4276         ifmgd->dtim_period = 0;
4277         ifmgd->have_beacon = false;
4278
4279         err = ieee80211_prep_connection(sdata, req->bss, true);
4280         if (err)
4281                 goto err_clear;
4282
4283         rcu_read_lock();
4284         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4285
4286         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4287             !beacon_ies) {
4288                 /*
4289                  * Wait up to one beacon interval ...
4290                  * should this be more if we miss one?
4291                  */
4292                 sdata_info(sdata, "waiting for beacon from %pM\n",
4293                            ifmgd->bssid);
4294                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4295                 assoc_data->timeout_started = true;
4296                 assoc_data->need_beacon = true;
4297         } else if (beacon_ies) {
4298                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4299                                                     beacon_ies->data,
4300                                                     beacon_ies->len);
4301                 u8 dtim_count = 0;
4302
4303                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4304                         const struct ieee80211_tim_ie *tim;
4305                         tim = (void *)(tim_ie + 2);
4306                         ifmgd->dtim_period = tim->dtim_period;
4307                         dtim_count = tim->dtim_count;
4308                 }
4309                 ifmgd->have_beacon = true;
4310                 assoc_data->timeout = jiffies;
4311                 assoc_data->timeout_started = true;
4312
4313                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4314                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4315                         sdata->vif.bss_conf.sync_device_ts =
4316                                 bss->device_ts_beacon;
4317                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4318                 }
4319         } else {
4320                 assoc_data->timeout = jiffies;
4321                 assoc_data->timeout_started = true;
4322         }
4323         rcu_read_unlock();
4324
4325         run_again(sdata, assoc_data->timeout);
4326
4327         if (bss->corrupt_data) {
4328                 char *corrupt_type = "data";
4329                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4330                         if (bss->corrupt_data &
4331                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4332                                 corrupt_type = "beacon and probe response";
4333                         else
4334                                 corrupt_type = "beacon";
4335                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4336                         corrupt_type = "probe response";
4337                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4338                            corrupt_type);
4339         }
4340
4341         return 0;
4342  err_clear:
4343         memset(ifmgd->bssid, 0, ETH_ALEN);
4344         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4345         ifmgd->assoc_data = NULL;
4346  err_free:
4347         kfree(assoc_data);
4348         return err;
4349 }
4350
4351 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4352                          struct cfg80211_deauth_request *req)
4353 {
4354         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4355         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4356         bool tx = !req->local_state_change;
4357         bool report_frame = false;
4358
4359         sdata_info(sdata,
4360                    "deauthenticating from %pM by local choice (reason=%d)\n",
4361                    req->bssid, req->reason_code);
4362
4363         if (ifmgd->auth_data) {
4364                 drv_mgd_prepare_tx(sdata->local, sdata);
4365                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4366                                                IEEE80211_STYPE_DEAUTH,
4367                                                req->reason_code, tx,
4368                                                frame_buf);
4369                 ieee80211_destroy_auth_data(sdata, false);
4370
4371                 report_frame = true;
4372                 goto out;
4373         }
4374
4375         if (ifmgd->associated &&
4376             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4377                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4378                                        req->reason_code, tx, frame_buf);
4379                 report_frame = true;
4380         }
4381
4382  out:
4383         if (report_frame)
4384                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4385                                       IEEE80211_DEAUTH_FRAME_LEN);
4386
4387         return 0;
4388 }
4389
4390 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4391                            struct cfg80211_disassoc_request *req)
4392 {
4393         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4394         u8 bssid[ETH_ALEN];
4395         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4396
4397         /*
4398          * cfg80211 should catch this ... but it's racy since
4399          * we can receive a disassoc frame, process it, hand it
4400          * to cfg80211 while that's in a locked section already
4401          * trying to tell us that the user wants to disconnect.
4402          */
4403         if (ifmgd->associated != req->bss)
4404                 return -ENOLINK;
4405
4406         sdata_info(sdata,
4407                    "disassociating from %pM by local choice (reason=%d)\n",
4408                    req->bss->bssid, req->reason_code);
4409
4410         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4411         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4412                                req->reason_code, !req->local_state_change,
4413                                frame_buf);
4414
4415         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4416                               IEEE80211_DEAUTH_FRAME_LEN);
4417
4418         return 0;
4419 }
4420
4421 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4422 {
4423         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4424
4425         /*
4426          * Make sure some work items will not run after this,
4427          * they will not do anything but might not have been
4428          * cancelled when disconnecting.
4429          */
4430         cancel_work_sync(&ifmgd->monitor_work);
4431         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4432         cancel_work_sync(&ifmgd->request_smps_work);
4433         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4434         cancel_work_sync(&ifmgd->chswitch_work);
4435
4436         sdata_lock(sdata);
4437         if (ifmgd->assoc_data) {
4438                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4439                 ieee80211_destroy_assoc_data(sdata, false);
4440                 cfg80211_assoc_timeout(sdata->dev, bss);
4441         }
4442         if (ifmgd->auth_data)
4443                 ieee80211_destroy_auth_data(sdata, false);
4444         del_timer_sync(&ifmgd->timer);
4445         sdata_unlock(sdata);
4446 }
4447
4448 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4449                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4450                                gfp_t gfp)
4451 {
4452         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4453
4454         trace_api_cqm_rssi_notify(sdata, rssi_event);
4455
4456         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4457 }
4458 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);