net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/pm_qos.h>
  23 #include <linux/crc32.h>
  24 #include <linux/slab.h>
  25 #include <linux/export.h>
  26 #include <net/mac80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "led.h"
  33
  34 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  35 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  36 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  37 #define IEEE80211_AUTH_MAX_TRIES        3
  38 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  39 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  40 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  41 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  42 #define IEEE80211_ASSOC_MAX_TRIES       3
  43
  44 static int max_nullfunc_tries = 2;
  45 module_param(max_nullfunc_tries, int, 0644);
  46 MODULE_PARM_DESC(max_nullfunc_tries,
  47                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  48
  49 static int max_probe_tries = 5;
  50 module_param(max_probe_tries, int, 0644);
  51 MODULE_PARM_DESC(max_probe_tries,
  52                  "Maximum probe tries before disconnecting (reason 4).");
  53
  54 /*
  55  * Beacon loss timeout is calculated as N frames times the
  56  * advertised beacon interval.  This may need to be somewhat
  57  * higher than what hardware might detect to account for
  58  * delays in the host processing frames. But since we also
  59  * probe on beacon miss before declaring the connection lost
  60  * default to what we want.
  61  */
  62 static int beacon_loss_count = 7;
  63 module_param(beacon_loss_count, int, 0644);
  64 MODULE_PARM_DESC(beacon_loss_count,
  65                  "Number of beacon intervals before we decide beacon was lost.");
  66
  67 /*
  68  * Time the connection can be idle before we probe
  69  * it to see if we can still talk to the AP.
  70  */
  71 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  72 /*
  73  * Time we wait for a probe response after sending
  74  * a probe request because of beacon loss or for
  75  * checking the connection still works.
  76  */
  77 static int probe_wait_ms = 500;
  78 module_param(probe_wait_ms, int, 0644);
  79 MODULE_PARM_DESC(probe_wait_ms,
  80                  "Maximum time(ms) to wait for probe response"
  81                  " before disconnecting (reason 4).");
  82
  83 /*
  84  * Weight given to the latest Beacon frame when calculating average signal
  85  * strength for Beacon frames received in the current BSS. This must be
  86  * between 1 and 15.
  87  */
  88 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  89
  90 /*
  91  * How many Beacon frames need to have been used in average signal strength
  92  * before starting to indicate signal change events.
  93  */
  94 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  95
  96 /*
  97  * We can have multiple work items (and connection probing)
  98  * scheduling this timer, but we need to take care to only
  99  * reschedule it when it should fire _earlier_ than it was
 100  * asked for before, or if it's not pending right now. This
 101  * function ensures that. Note that it then is required to
 102  * run this function for all timeouts after the first one
 103  * has happened -- the work that runs from this timer will
 104  * do that.
 105  */
 106 static void run_again(struct ieee80211_sub_if_data *sdata,
 107                       unsigned long timeout)
 108 {
 109         sdata_assert_lock(sdata);
 110
 111         if (!timer_pending(&sdata->u.mgd.timer) ||
 112             time_before(timeout, sdata->u.mgd.timer.expires))
 113                 mod_timer(&sdata->u.mgd.timer, timeout);
 114 }
 115
 116 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 117 {
 118         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 119                 return;
 120
 121         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 122                 return;
 123
 124         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 125                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 126 }
 127
 128 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 129 {
 130         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 131
 132         if (unlikely(!sdata->u.mgd.associated))
 133                 return;
 134
 135         ifmgd->probe_send_count = 0;
 136
 137         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 138                 return;
 139
 140         mod_timer(&sdata->u.mgd.conn_mon_timer,
 141                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 142 }
 143
 144 static int ecw2cw(int ecw)
 145 {
 146         return (1 << ecw) - 1;
 147 }
 148
 149 static u32
 150 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 151                              struct ieee80211_supported_band *sband,
 152                              struct ieee80211_channel *channel,
 153                              const struct ieee80211_ht_cap *ht_cap,
 154                              const struct ieee80211_ht_operation *ht_oper,
 155                              const struct ieee80211_vht_operation *vht_oper,
 156                              struct cfg80211_chan_def *chandef, bool tracking)
 157 {
 158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 159         struct cfg80211_chan_def vht_chandef;
 160         struct ieee80211_sta_ht_cap sta_ht_cap;
 161         u32 ht_cfreq, ret;
 162
 163         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 164         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 165
 166         chandef->chan = channel;
 167         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 168         chandef->center_freq1 = channel->center_freq;
 169         chandef->center_freq2 = 0;
 170
 171         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 172                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 173                 goto out;
 174         }
 175
 176         chandef->width = NL80211_CHAN_WIDTH_20;
 177
 178         if (!(ht_cap->cap_info &
 179               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 180                 ret = IEEE80211_STA_DISABLE_40MHZ;
 181                 vht_chandef = *chandef;
 182                 goto out;
 183         }
 184
 185         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 186                                                   channel->band);
 187         /* check that channel matches the right operating channel */
 188         if (!tracking && channel->center_freq != ht_cfreq) {
 189                 /*
 190                  * It's possible that some APs are confused here;
 191                  * Netgear WNDR3700 sometimes reports 4 higher than
 192                  * the actual channel in association responses, but
 193                  * since we look at probe response/beacon data here
 194                  * it should be OK.
 195                  */
 196                 sdata_info(sdata,
 197                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 198                            channel->center_freq, ht_cfreq,
 199                            ht_oper->primary_chan, channel->band);
 200                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 201                 goto out;
 202         }
 203
 204         /* check 40 MHz support, if we have it */
 205         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 206                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 207                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 208                         chandef->width = NL80211_CHAN_WIDTH_40;
 209                         chandef->center_freq1 += 10;
 210                         break;
 211                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 212                         chandef->width = NL80211_CHAN_WIDTH_40;
 213                         chandef->center_freq1 -= 10;
 214                         break;
 215                 }
 216         } else {
 217                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 218                 ret = IEEE80211_STA_DISABLE_VHT;
 219                 /* also mark 40 MHz disabled */
 220                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 221                 goto out;
 222         }
 223
 224         if (!vht_oper || !sband->vht_cap.vht_supported) {
 225                 ret = IEEE80211_STA_DISABLE_VHT;
 226                 goto out;
 227         }
 228
 229         vht_chandef.chan = channel;
 230         vht_chandef.center_freq1 =
 231                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 232                                                channel->band);
 233         vht_chandef.center_freq2 = 0;
 234
 235         switch (vht_oper->chan_width) {
 236         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 237                 vht_chandef.width = chandef->width;
 238                 vht_chandef.center_freq1 = chandef->center_freq1;
 239                 break;
 240         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 241                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 242                 break;
 243         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 244                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 245                 break;
 246         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 247                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 248                 vht_chandef.center_freq2 =
 249                         ieee80211_channel_to_frequency(
 250                                 vht_oper->center_freq_seg2_idx,
 251                                 channel->band);
 252                 break;
 253         default:
 254                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 255                         sdata_info(sdata,
 256                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 257                                    vht_oper->chan_width);
 258                 ret = IEEE80211_STA_DISABLE_VHT;
 259                 goto out;
 260         }
 261
 262         if (!cfg80211_chandef_valid(&vht_chandef)) {
 263                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 264                         sdata_info(sdata,
 265                                    "AP VHT information is invalid, disable VHT\n");
 266                 ret = IEEE80211_STA_DISABLE_VHT;
 267                 goto out;
 268         }
 269
 270         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 271                 ret = 0;
 272                 goto out;
 273         }
 274
 275         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 276                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 277                         sdata_info(sdata,
 278                                    "AP VHT information doesn't match HT, disable VHT\n");
 279                 ret = IEEE80211_STA_DISABLE_VHT;
 280                 goto out;
 281         }
 282
 283         *chandef = vht_chandef;
 284
 285         ret = 0;
 286
 287 out:
 288         /*
 289          * When tracking the current AP, don't do any further checks if the
 290          * new chandef is identical to the one we're currently using for the
 291          * connection. This keeps us from playing ping-pong with regulatory,
 292          * without it the following can happen (for example):
 293          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 294          *  - AP advertises regdom US
 295          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 296          *  - the code below detects an unsupported channel, downgrades, and
 297          *    we disconnect from the AP in the caller
 298          *  - disconnect causes CRDA to reload world regdomain and the game
 299          *    starts anew.
 300          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 301          *
 302          * It seems possible that there are still scenarios with CSA or real
 303          * bandwidth changes where a this could happen, but those cases are
 304          * less common and wouldn't completely prevent using the AP.
 305          */
 306         if (tracking &&
 307             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 308                 return ret;
 309
 310         /* don't print the message below for VHT mismatch if VHT is disabled */
 311         if (ret & IEEE80211_STA_DISABLE_VHT)
 312                 vht_chandef = *chandef;
 313
 314         /*
 315          * Ignore the DISABLED flag when we're already connected and only
 316          * tracking the APs beacon for bandwidth changes - otherwise we
 317          * might get disconnected here if we connect to an AP, update our
 318          * regulatory information based on the AP's country IE and the
 319          * information we have is wrong/outdated and disables the channel
 320          * that we're actually using for the connection to the AP.
 321          */
 322         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 323                                         tracking ? 0 :
 324                                                    IEEE80211_CHAN_DISABLED)) {
 325                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 326                         ret = IEEE80211_STA_DISABLE_HT |
 327                               IEEE80211_STA_DISABLE_VHT;
 328                         break;
 329                 }
 330
 331                 ret |= ieee80211_chandef_downgrade(chandef);
 332         }
 333
 334         if (chandef->width != vht_chandef.width && !tracking)
 335                 sdata_info(sdata,
 336                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 337
 338         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 339         return ret;
 340 }
 341
 342 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 343                                struct sta_info *sta,
 344                                const struct ieee80211_ht_cap *ht_cap,
 345                                const struct ieee80211_ht_operation *ht_oper,
 346                                const struct ieee80211_vht_operation *vht_oper,
 347                                const u8 *bssid, u32 *changed)
 348 {
 349         struct ieee80211_local *local = sdata->local;
 350         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 351         struct ieee80211_supported_band *sband;
 352         struct ieee80211_channel *chan;
 353         struct cfg80211_chan_def chandef;
 354         u16 ht_opmode;
 355         u32 flags;
 356         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 357         int ret;
 358
 359         /* if HT was/is disabled, don't track any bandwidth changes */
 360         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 361                 return 0;
 362
 363         /* don't check VHT if we associated as non-VHT station */
 364         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 365                 vht_oper = NULL;
 366
 367         if (WARN_ON_ONCE(!sta))
 368                 return -EINVAL;
 369
 370         /*
 371          * if bss configuration changed store the new one -
 372          * this may be applicable even if channel is identical
 373          */
 374         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 375         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 376                 *changed |= BSS_CHANGED_HT;
 377                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 378         }
 379
 380         chan = sdata->vif.bss_conf.chandef.chan;
 381         sband = local->hw.wiphy->bands[chan->band];
 382
 383         /* calculate new channel (type) based on HT/VHT operation IEs */
 384         flags = ieee80211_determine_chantype(sdata, sband, chan,
 385                                              ht_cap, ht_oper, vht_oper,
 386                                              &chandef, true);
 387
 388         /*
 389          * Downgrade the new channel if we associated with restricted
 390          * capabilities. For example, if we associated as a 20 MHz STA
 391          * to a 40 MHz AP (due to regulatory, capabilities or config
 392          * reasons) then switching to a 40 MHz channel now won't do us
 393          * any good -- we couldn't use it with the AP.
 394          */
 395         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 396             chandef.width == NL80211_CHAN_WIDTH_80P80)
 397                 flags |= ieee80211_chandef_downgrade(&chandef);
 398         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 399             chandef.width == NL80211_CHAN_WIDTH_160)
 400                 flags |= ieee80211_chandef_downgrade(&chandef);
 401         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 402             chandef.width > NL80211_CHAN_WIDTH_20)
 403                 flags |= ieee80211_chandef_downgrade(&chandef);
 404
 405         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 406                 return 0;
 407
 408         sdata_info(sdata,
 409                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 410                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 411                    chandef.center_freq1, chandef.center_freq2);
 412
 413         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 414                                       IEEE80211_STA_DISABLE_VHT |
 415                                       IEEE80211_STA_DISABLE_40MHZ |
 416                                       IEEE80211_STA_DISABLE_80P80MHZ |
 417                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 418             !cfg80211_chandef_valid(&chandef)) {
 419                 sdata_info(sdata,
 420                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 421                            ifmgd->bssid);
 422                 return -EINVAL;
 423         }
 424
 425         switch (chandef.width) {
 426         case NL80211_CHAN_WIDTH_20_NOHT:
 427         case NL80211_CHAN_WIDTH_20:
 428                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 429                 break;
 430         case NL80211_CHAN_WIDTH_40:
 431                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 432                 break;
 433         case NL80211_CHAN_WIDTH_80:
 434                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 435                 break;
 436         case NL80211_CHAN_WIDTH_80P80:
 437         case NL80211_CHAN_WIDTH_160:
 438                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 439                 break;
 440         default:
 441                 return -EINVAL;
 442         }
 443
 444         if (new_sta_bw > sta->cur_max_bandwidth)
 445                 new_sta_bw = sta->cur_max_bandwidth;
 446
 447         if (new_sta_bw < sta->sta.bandwidth) {
 448                 sta->sta.bandwidth = new_sta_bw;
 449                 rate_control_rate_update(local, sband, sta,
 450                                          IEEE80211_RC_BW_CHANGED);
 451         }
 452
 453         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 454         if (ret) {
 455                 sdata_info(sdata,
 456                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 457                            ifmgd->bssid);
 458                 return ret;
 459         }
 460
 461         if (new_sta_bw > sta->sta.bandwidth) {
 462                 sta->sta.bandwidth = new_sta_bw;
 463                 rate_control_rate_update(local, sband, sta,
 464                                          IEEE80211_RC_BW_CHANGED);
 465         }
 466
 467         return 0;
 468 }
 469
 470 /* frame sending functions */
 471
 472 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 473                                 struct sk_buff *skb, u8 ap_ht_param,
 474                                 struct ieee80211_supported_band *sband,
 475                                 struct ieee80211_channel *channel,
 476                                 enum ieee80211_smps_mode smps)
 477 {
 478         u8 *pos;
 479         u32 flags = channel->flags;
 480         u16 cap;
 481         struct ieee80211_sta_ht_cap ht_cap;
 482
 483         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 484
 485         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 486         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 487
 488         /* determine capability flags */
 489         cap = ht_cap.cap;
 490
 491         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 492         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 493                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 494                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 495                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 496                 }
 497                 break;
 498         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 499                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 500                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 501                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 502                 }
 503                 break;
 504         }
 505
 506         /*
 507          * If 40 MHz was disabled associate as though we weren't
 508          * capable of 40 MHz -- some broken APs will never fall
 509          * back to trying to transmit in 20 MHz.
 510          */
 511         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 512                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 513                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 514         }
 515
 516         /* set SM PS mode properly */
 517         cap &= ~IEEE80211_HT_CAP_SM_PS;
 518         switch (smps) {
 519         case IEEE80211_SMPS_AUTOMATIC:
 520         case IEEE80211_SMPS_NUM_MODES:
 521                 WARN_ON(1);
 522         case IEEE80211_SMPS_OFF:
 523                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 524                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 525                 break;
 526         case IEEE80211_SMPS_STATIC:
 527                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 528                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 529                 break;
 530         case IEEE80211_SMPS_DYNAMIC:
 531                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 532                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 533                 break;
 534         }
 535
 536         /* reserve and fill IE */
 537         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 538         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 539 }
 540
 541 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 542                                  struct sk_buff *skb,
 543                                  struct ieee80211_supported_band *sband,
 544                                  struct ieee80211_vht_cap *ap_vht_cap)
 545 {
 546         u8 *pos;
 547         u32 cap;
 548         struct ieee80211_sta_vht_cap vht_cap;
 549         u32 mask, ap_bf_sts, our_bf_sts;
 550
 551         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 552
 553         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 554         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 555
 556         /* determine capability flags */
 557         cap = vht_cap.cap;
 558
 559         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 560                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 561
 562                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 563                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 564                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 565                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 566         }
 567
 568         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 569                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 570                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 571         }
 572
 573         /*
 574          * Some APs apparently get confused if our capabilities are better
 575          * than theirs, so restrict what we advertise in the assoc request.
 576          */
 577         if (!(ap_vht_cap->vht_cap_info &
 578                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 579                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 580
 581         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 582
 583         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 584         our_bf_sts = cap & mask;
 585
 586         if (ap_bf_sts < our_bf_sts) {
 587                 cap &= ~mask;
 588                 cap |= ap_bf_sts;
 589         }
 590
 591         /* reserve and fill IE */
 592         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 593         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 594 }
 595
 596 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 597 {
 598         struct ieee80211_local *local = sdata->local;
 599         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 600         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 601         struct sk_buff *skb;
 602         struct ieee80211_mgmt *mgmt;
 603         u8 *pos, qos_info;
 604         size_t offset = 0, noffset;
 605         int i, count, rates_len, supp_rates_len, shift;
 606         u16 capab;
 607         struct ieee80211_supported_band *sband;
 608         struct ieee80211_chanctx_conf *chanctx_conf;
 609         struct ieee80211_channel *chan;
 610         u32 rate_flags, rates = 0;
 611
 612         sdata_assert_lock(sdata);
 613
 614         rcu_read_lock();
 615         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 616         if (WARN_ON(!chanctx_conf)) {
 617                 rcu_read_unlock();
 618                 return;
 619         }
 620         chan = chanctx_conf->def.chan;
 621         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 622         rcu_read_unlock();
 623         sband = local->hw.wiphy->bands[chan->band];
 624         shift = ieee80211_vif_get_shift(&sdata->vif);
 625
 626         if (assoc_data->supp_rates_len) {
 627                 /*
 628                  * Get all rates supported by the device and the AP as
 629                  * some APs don't like getting a superset of their rates
 630                  * in the association request (e.g. D-Link DAP 1353 in
 631                  * b-only mode)...
 632                  */
 633                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 634                                                      assoc_data->supp_rates,
 635                                                      assoc_data->supp_rates_len,
 636                                                      &rates);
 637         } else {
 638                 /*
 639                  * In case AP not provide any supported rates information
 640                  * before association, we send information element(s) with
 641                  * all rates that we support.
 642                  */
 643                 rates_len = 0;
 644                 for (i = 0; i < sband->n_bitrates; i++) {
 645                         if ((rate_flags & sband->bitrates[i].flags)
 646                             != rate_flags)
 647                                 continue;
 648                         rates |= BIT(i);
 649                         rates_len++;
 650                 }
 651         }
 652
 653         skb = alloc_skb(local->hw.extra_tx_headroom +
 654                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 655                         2 + assoc_data->ssid_len + /* SSID */
 656                         4 + rates_len + /* (extended) rates */
 657                         4 + /* power capability */
 658                         2 + 2 * sband->n_channels + /* supported channels */
 659                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 660                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 661                         assoc_data->ie_len + /* extra IEs */
 662                         9, /* WMM */
 663                         GFP_KERNEL);
 664         if (!skb)
 665                 return;
 666
 667         skb_reserve(skb, local->hw.extra_tx_headroom);
 668
 669         capab = WLAN_CAPABILITY_ESS;
 670
 671         if (sband->band == IEEE80211_BAND_2GHZ) {
 672                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 673                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 674                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 675                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 676         }
 677
 678         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 679                 capab |= WLAN_CAPABILITY_PRIVACY;
 680
 681         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 682             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 683                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 684
 685         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 686                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 687
 688         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 689         memset(mgmt, 0, 24);
 690         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 691         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 692         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 693
 694         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 695                 skb_put(skb, 10);
 696                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 697                                                   IEEE80211_STYPE_REASSOC_REQ);
 698                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 699                 mgmt->u.reassoc_req.listen_interval =
 700                                 cpu_to_le16(local->hw.conf.listen_interval);
 701                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 702                        ETH_ALEN);
 703         } else {
 704                 skb_put(skb, 4);
 705                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 706                                                   IEEE80211_STYPE_ASSOC_REQ);
 707                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 708                 mgmt->u.assoc_req.listen_interval =
 709                                 cpu_to_le16(local->hw.conf.listen_interval);
 710         }
 711
 712         /* SSID */
 713         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 714         *pos++ = WLAN_EID_SSID;
 715         *pos++ = assoc_data->ssid_len;
 716         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 717
 718         /* add all rates which were marked to be used above */
 719         supp_rates_len = rates_len;
 720         if (supp_rates_len > 8)
 721                 supp_rates_len = 8;
 722
 723         pos = skb_put(skb, supp_rates_len + 2);
 724         *pos++ = WLAN_EID_SUPP_RATES;
 725         *pos++ = supp_rates_len;
 726
 727         count = 0;
 728         for (i = 0; i < sband->n_bitrates; i++) {
 729                 if (BIT(i) & rates) {
 730                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 731                                                 5 * (1 << shift));
 732                         *pos++ = (u8) rate;
 733                         if (++count == 8)
 734                                 break;
 735                 }
 736         }
 737
 738         if (rates_len > count) {
 739                 pos = skb_put(skb, rates_len - count + 2);
 740                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 741                 *pos++ = rates_len - count;
 742
 743                 for (i++; i < sband->n_bitrates; i++) {
 744                         if (BIT(i) & rates) {
 745                                 int rate;
 746                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 747                                                     5 * (1 << shift));
 748                                 *pos++ = (u8) rate;
 749                         }
 750                 }
 751         }
 752
 753         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 754             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 755                 pos = skb_put(skb, 4);
 756                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 757                 *pos++ = 2;
 758                 *pos++ = 0; /* min tx power */
 759                  /* max tx power */
 760                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 761         }
 762
 763         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 764                 /* TODO: get this in reg domain format */
 765                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 766                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 767                 *pos++ = 2 * sband->n_channels;
 768                 for (i = 0; i < sband->n_channels; i++) {
 769                         *pos++ = ieee80211_frequency_to_channel(
 770                                         sband->channels[i].center_freq);
 771                         *pos++ = 1; /* one channel in the subband*/
 772                 }
 773         }
 774
 775         /* if present, add any custom IEs that go before HT */
 776         if (assoc_data->ie_len) {
 777                 static const u8 before_ht[] = {
 778                         WLAN_EID_SSID,
 779                         WLAN_EID_SUPP_RATES,
 780                         WLAN_EID_EXT_SUPP_RATES,
 781                         WLAN_EID_PWR_CAPABILITY,
 782                         WLAN_EID_SUPPORTED_CHANNELS,
 783                         WLAN_EID_RSN,
 784                         WLAN_EID_QOS_CAPA,
 785                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 786                         WLAN_EID_MOBILITY_DOMAIN,
 787                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 788                         WLAN_EID_RIC_DATA,              /* reassoc only */
 789                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 790                 };
 791                 static const u8 after_ric[] = {
 792                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 793                         WLAN_EID_HT_CAPABILITY,
 794                         WLAN_EID_BSS_COEX_2040,
 795                         WLAN_EID_EXT_CAPABILITY,
 796                         WLAN_EID_QOS_TRAFFIC_CAPA,
 797                         WLAN_EID_TIM_BCAST_REQ,
 798                         WLAN_EID_INTERWORKING,
 799                         /* 60GHz doesn't happen right now */
 800                         WLAN_EID_VHT_CAPABILITY,
 801                         WLAN_EID_OPMODE_NOTIF,
 802                 };
 803
 804                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 805                                                  assoc_data->ie_len,
 806                                                  before_ht,
 807                                                  ARRAY_SIZE(before_ht),
 808                                                  after_ric,
 809                                                  ARRAY_SIZE(after_ric),
 810                                                  offset);
 811                 pos = skb_put(skb, noffset - offset);
 812                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 813                 offset = noffset;
 814         }
 815
 816         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 817                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 818                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 819
 820         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 821                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 822                                     sband, chan, sdata->smps_mode);
 823
 824         /* if present, add any custom IEs that go before VHT */
 825         if (assoc_data->ie_len) {
 826                 static const u8 before_vht[] = {
 827                         WLAN_EID_SSID,
 828                         WLAN_EID_SUPP_RATES,
 829                         WLAN_EID_EXT_SUPP_RATES,
 830                         WLAN_EID_PWR_CAPABILITY,
 831                         WLAN_EID_SUPPORTED_CHANNELS,
 832                         WLAN_EID_RSN,
 833                         WLAN_EID_QOS_CAPA,
 834                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 835                         WLAN_EID_MOBILITY_DOMAIN,
 836                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 837                         WLAN_EID_HT_CAPABILITY,
 838                         WLAN_EID_BSS_COEX_2040,
 839                         WLAN_EID_EXT_CAPABILITY,
 840                         WLAN_EID_QOS_TRAFFIC_CAPA,
 841                         WLAN_EID_TIM_BCAST_REQ,
 842                         WLAN_EID_INTERWORKING,
 843                 };
 844
 845                 /* RIC already taken above, so no need to handle here anymore */
 846                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 847                                              before_vht, ARRAY_SIZE(before_vht),
 848                                              offset);
 849                 pos = skb_put(skb, noffset - offset);
 850                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 851                 offset = noffset;
 852         }
 853
 854         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 855                 ieee80211_add_vht_ie(sdata, skb, sband,
 856                                      &assoc_data->ap_vht_cap);
 857
 858         /* if present, add any custom non-vendor IEs that go after HT */
 859         if (assoc_data->ie_len) {
 860                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 861                                                     assoc_data->ie_len,
 862                                                     offset);
 863                 pos = skb_put(skb, noffset - offset);
 864                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 865                 offset = noffset;
 866         }
 867
 868         if (assoc_data->wmm) {
 869                 if (assoc_data->uapsd) {
 870                         qos_info = ifmgd->uapsd_queues;
 871                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 872                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 873                 } else {
 874                         qos_info = 0;
 875                 }
 876
 877                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 878         }
 879
 880         /* add any remaining custom (i.e. vendor specific here) IEs */
 881         if (assoc_data->ie_len) {
 882                 noffset = assoc_data->ie_len;
 883                 pos = skb_put(skb, noffset - offset);
 884                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 885         }
 886
 887         drv_mgd_prepare_tx(local, sdata);
 888
 889         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 890         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 891                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 892                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 893         ieee80211_tx_skb(sdata, skb);
 894 }
 895
 896 void ieee80211_send_pspoll(struct ieee80211_local *local,
 897                            struct ieee80211_sub_if_data *sdata)
 898 {
 899         struct ieee80211_pspoll *pspoll;
 900         struct sk_buff *skb;
 901
 902         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 903         if (!skb)
 904                 return;
 905
 906         pspoll = (struct ieee80211_pspoll *) skb->data;
 907         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 908
 909         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 910         ieee80211_tx_skb(sdata, skb);
 911 }
 912
 913 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 914                              struct ieee80211_sub_if_data *sdata,
 915                              int powersave)
 916 {
 917         struct sk_buff *skb;
 918         struct ieee80211_hdr_3addr *nullfunc;
 919         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 920
 921         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 922         if (!skb)
 923                 return;
 924
 925         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 926         if (powersave)
 927                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 928
 929         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 930                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 931
 932         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 933                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 934
 935         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 936                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 937
 938         ieee80211_tx_skb(sdata, skb);
 939 }
 940
 941 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 942                                           struct ieee80211_sub_if_data *sdata)
 943 {
 944         struct sk_buff *skb;
 945         struct ieee80211_hdr *nullfunc;
 946         __le16 fc;
 947
 948         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 949                 return;
 950
 951         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 952         if (!skb)
 953                 return;
 954
 955         skb_reserve(skb, local->hw.extra_tx_headroom);
 956
 957         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 958         memset(nullfunc, 0, 30);
 959         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 960                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 961         nullfunc->frame_control = fc;
 962         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 963         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 964         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 965         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 966
 967         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 968         ieee80211_tx_skb(sdata, skb);
 969 }
 970
 971 /* spectrum management related things */
 972 static void ieee80211_chswitch_work(struct work_struct *work)
 973 {
 974         struct ieee80211_sub_if_data *sdata =
 975                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 976         struct ieee80211_local *local = sdata->local;
 977         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 978         int ret;
 979
 980         if (!ieee80211_sdata_running(sdata))
 981                 return;
 982
 983         sdata_lock(sdata);
 984         mutex_lock(&local->mtx);
 985         mutex_lock(&local->chanctx_mtx);
 986
 987         if (!ifmgd->associated)
 988                 goto out;
 989
 990         if (!sdata->vif.csa_active)
 991                 goto out;
 992
 993         /*
 994          * using reservation isn't immediate as it may be deferred until later
 995          * with multi-vif. once reservation is complete it will re-schedule the
 996          * work with no reserved_chanctx so verify chandef to check if it
 997          * completed successfully
 998          */
 999
1000         if (sdata->reserved_chanctx) {
1001                 /*
1002                  * with multi-vif csa driver may call ieee80211_csa_finish()
1003                  * many times while waiting for other interfaces to use their
1004                  * reservations
1005                  */
1006                 if (sdata->reserved_ready)
1007                         goto out;
1008
1009                 ret = ieee80211_vif_use_reserved_context(sdata);
1010                 if (ret) {
1011                         sdata_info(sdata,
1012                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1013                                    ret);
1014                         ieee80211_queue_work(&sdata->local->hw,
1015                                              &ifmgd->csa_connection_drop_work);
1016                         goto out;
1017                 }
1018
1019                 goto out;
1020         }
1021
1022         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1023                                         &sdata->csa_chandef)) {
1024                 sdata_info(sdata,
1025                            "failed to finalize channel switch, disconnecting\n");
1026                 ieee80211_queue_work(&sdata->local->hw,
1027                                      &ifmgd->csa_connection_drop_work);
1028                 goto out;
1029         }
1030
1031         /* XXX: shouldn't really modify cfg80211-owned data! */
1032         ifmgd->associated->channel = sdata->csa_chandef.chan;
1033
1034         ifmgd->csa_waiting_bcn = true;
1035
1036         ieee80211_sta_reset_beacon_monitor(sdata);
1037         ieee80211_sta_reset_conn_monitor(sdata);
1038
1039 out:
1040         mutex_unlock(&local->chanctx_mtx);
1041         mutex_unlock(&local->mtx);
1042         sdata_unlock(sdata);
1043 }
1044
1045 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1046 {
1047         struct ieee80211_local *local = sdata->local;
1048         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1049         int ret;
1050
1051         sdata_assert_lock(sdata);
1052
1053         WARN_ON(!sdata->vif.csa_active);
1054
1055         if (sdata->csa_block_tx) {
1056                 ieee80211_wake_vif_queues(local, sdata,
1057                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1058                 sdata->csa_block_tx = false;
1059         }
1060
1061         sdata->vif.csa_active = false;
1062         ifmgd->csa_waiting_bcn = false;
1063
1064         ret = drv_post_channel_switch(sdata);
1065         if (ret) {
1066                 sdata_info(sdata,
1067                            "driver post channel switch failed, disconnecting\n");
1068                 ieee80211_queue_work(&local->hw,
1069                                      &ifmgd->csa_connection_drop_work);
1070                 return;
1071         }
1072
1073         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1074 }
1075
1076 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1077 {
1078         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1079         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1080
1081         trace_api_chswitch_done(sdata, success);
1082         if (!success) {
1083                 sdata_info(sdata,
1084                            "driver channel switch failed, disconnecting\n");
1085                 ieee80211_queue_work(&sdata->local->hw,
1086                                      &ifmgd->csa_connection_drop_work);
1087         } else {
1088                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1089         }
1090 }
1091 EXPORT_SYMBOL(ieee80211_chswitch_done);
1092
1093 static void ieee80211_chswitch_timer(unsigned long data)
1094 {
1095         struct ieee80211_sub_if_data *sdata =
1096                 (struct ieee80211_sub_if_data *) data;
1097
1098         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1099 }
1100
1101 static void
1102 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1103                                  u64 timestamp, u32 device_timestamp,
1104                                  struct ieee802_11_elems *elems,
1105                                  bool beacon)
1106 {
1107         struct ieee80211_local *local = sdata->local;
1108         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1109         struct cfg80211_bss *cbss = ifmgd->associated;
1110         struct ieee80211_chanctx_conf *conf;
1111         struct ieee80211_chanctx *chanctx;
1112         enum ieee80211_band current_band;
1113         struct ieee80211_csa_ie csa_ie;
1114         struct ieee80211_channel_switch ch_switch;
1115         int res;
1116
1117         sdata_assert_lock(sdata);
1118
1119         if (!cbss)
1120                 return;
1121
1122         if (local->scanning)
1123                 return;
1124
1125         /* disregard subsequent announcements if we are already processing */
1126         if (sdata->vif.csa_active)
1127                 return;
1128
1129         current_band = cbss->channel->band;
1130         memset(&csa_ie, 0, sizeof(csa_ie));
1131         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1132                                            ifmgd->flags,
1133                                            ifmgd->associated->bssid, &csa_ie);
1134         if (res < 0)
1135                 ieee80211_queue_work(&local->hw,
1136                                      &ifmgd->csa_connection_drop_work);
1137         if (res)
1138                 return;
1139
1140         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1141                                      IEEE80211_CHAN_DISABLED)) {
1142                 sdata_info(sdata,
1143                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1144                            ifmgd->associated->bssid,
1145                            csa_ie.chandef.chan->center_freq,
1146                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1147                            csa_ie.chandef.center_freq2);
1148                 ieee80211_queue_work(&local->hw,
1149                                      &ifmgd->csa_connection_drop_work);
1150                 return;
1151         }
1152
1153         mutex_lock(&local->mtx);
1154         mutex_lock(&local->chanctx_mtx);
1155         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1156                                          lockdep_is_held(&local->chanctx_mtx));
1157         if (!conf) {
1158                 sdata_info(sdata,
1159                            "no channel context assigned to vif?, disconnecting\n");
1160                 goto drop_connection;
1161         }
1162
1163         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1164
1165         if (local->use_chanctx &&
1166             !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1167                 sdata_info(sdata,
1168                            "driver doesn't support chan-switch with channel contexts\n");
1169                 goto drop_connection;
1170         }
1171
1172         ch_switch.timestamp = timestamp;
1173         ch_switch.device_timestamp = device_timestamp;
1174         ch_switch.block_tx = csa_ie.mode;
1175         ch_switch.chandef = csa_ie.chandef;
1176         ch_switch.count = csa_ie.count;
1177
1178         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1179                 sdata_info(sdata,
1180                            "preparing for channel switch failed, disconnecting\n");
1181                 goto drop_connection;
1182         }
1183
1184         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1185                                             chanctx->mode, false);
1186         if (res) {
1187                 sdata_info(sdata,
1188                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1189                            res);
1190                 goto drop_connection;
1191         }
1192         mutex_unlock(&local->chanctx_mtx);
1193
1194         sdata->vif.csa_active = true;
1195         sdata->csa_chandef = csa_ie.chandef;
1196         sdata->csa_block_tx = csa_ie.mode;
1197
1198         if (sdata->csa_block_tx)
1199                 ieee80211_stop_vif_queues(local, sdata,
1200                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1201         mutex_unlock(&local->mtx);
1202
1203         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1204                                           csa_ie.count);
1205
1206         if (local->ops->channel_switch) {
1207                 /* use driver's channel switch callback */
1208                 drv_channel_switch(local, sdata, &ch_switch);
1209                 return;
1210         }
1211
1212         /* channel switch handled in software */
1213         if (csa_ie.count <= 1)
1214                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1215         else
1216                 mod_timer(&ifmgd->chswitch_timer,
1217                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1218                                          cbss->beacon_interval));
1219         return;
1220  drop_connection:
1221         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1222         mutex_unlock(&local->chanctx_mtx);
1223         mutex_unlock(&local->mtx);
1224 }
1225
1226 static bool
1227 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1228                                  struct ieee80211_channel *channel,
1229                                  const u8 *country_ie, u8 country_ie_len,
1230                                  const u8 *pwr_constr_elem,
1231                                  int *chan_pwr, int *pwr_reduction)
1232 {
1233         struct ieee80211_country_ie_triplet *triplet;
1234         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1235         int i, chan_increment;
1236         bool have_chan_pwr = false;
1237
1238         /* Invalid IE */
1239         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1240                 return false;
1241
1242         triplet = (void *)(country_ie + 3);
1243         country_ie_len -= 3;
1244
1245         switch (channel->band) {
1246         default:
1247                 WARN_ON_ONCE(1);
1248                 /* fall through */
1249         case IEEE80211_BAND_2GHZ:
1250         case IEEE80211_BAND_60GHZ:
1251                 chan_increment = 1;
1252                 break;
1253         case IEEE80211_BAND_5GHZ:
1254                 chan_increment = 4;
1255                 break;
1256         }
1257
1258         /* find channel */
1259         while (country_ie_len >= 3) {
1260                 u8 first_channel = triplet->chans.first_channel;
1261
1262                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1263                         goto next;
1264
1265                 for (i = 0; i < triplet->chans.num_channels; i++) {
1266                         if (first_channel + i * chan_increment == chan) {
1267                                 have_chan_pwr = true;
1268                                 *chan_pwr = triplet->chans.max_power;
1269                                 break;
1270                         }
1271                 }
1272                 if (have_chan_pwr)
1273                         break;
1274
1275  next:
1276                 triplet++;
1277                 country_ie_len -= 3;
1278         }
1279
1280         if (have_chan_pwr && pwr_constr_elem)
1281                 *pwr_reduction = *pwr_constr_elem;
1282         else
1283                 *pwr_reduction = 0;
1284
1285         return have_chan_pwr;
1286 }
1287
1288 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1289                                       struct ieee80211_channel *channel,
1290                                       const u8 *cisco_dtpc_ie,
1291                                       int *pwr_level)
1292 {
1293         /* From practical testing, the first data byte of the DTPC element
1294          * seems to contain the requested dBm level, and the CLI on Cisco
1295          * APs clearly state the range is -127 to 127 dBm, which indicates
1296          * a signed byte, although it seemingly never actually goes negative.
1297          * The other byte seems to always be zero.
1298          */
1299         *pwr_level = (__s8)cisco_dtpc_ie[4];
1300 }
1301
1302 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1303                                        struct ieee80211_channel *channel,
1304                                        struct ieee80211_mgmt *mgmt,
1305                                        const u8 *country_ie, u8 country_ie_len,
1306                                        const u8 *pwr_constr_ie,
1307                                        const u8 *cisco_dtpc_ie)
1308 {
1309         bool has_80211h_pwr = false, has_cisco_pwr = false;
1310         int chan_pwr = 0, pwr_reduction_80211h = 0;
1311         int pwr_level_cisco, pwr_level_80211h;
1312         int new_ap_level;
1313         __le16 capab = mgmt->u.probe_resp.capab_info;
1314
1315         if (country_ie &&
1316             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1317              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1318                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1319                         sdata, channel, country_ie, country_ie_len,
1320                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1321                 pwr_level_80211h =
1322                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1323         }
1324
1325         if (cisco_dtpc_ie) {
1326                 ieee80211_find_cisco_dtpc(
1327                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1328                 has_cisco_pwr = true;
1329         }
1330
1331         if (!has_80211h_pwr && !has_cisco_pwr)
1332                 return 0;
1333
1334         /* If we have both 802.11h and Cisco DTPC, apply both limits
1335          * by picking the smallest of the two power levels advertised.
1336          */
1337         if (has_80211h_pwr &&
1338             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1339                 sdata_info(sdata,
1340                            "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1341                            pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1342                            sdata->u.mgd.bssid);
1343                 new_ap_level = pwr_level_80211h;
1344         } else {  /* has_cisco_pwr is always true here. */
1345                 sdata_info(sdata,
1346                            "Limiting TX power to %d dBm as advertised by %pM\n",
1347                            pwr_level_cisco, sdata->u.mgd.bssid);
1348                 new_ap_level = pwr_level_cisco;
1349         }
1350
1351         if (sdata->ap_power_level == new_ap_level)
1352                 return 0;
1353
1354         sdata->ap_power_level = new_ap_level;
1355         if (__ieee80211_recalc_txpower(sdata))
1356                 return BSS_CHANGED_TXPOWER;
1357         return 0;
1358 }
1359
1360 /* powersave */
1361 static void ieee80211_enable_ps(struct ieee80211_local *local,
1362                                 struct ieee80211_sub_if_data *sdata)
1363 {
1364         struct ieee80211_conf *conf = &local->hw.conf;
1365
1366         /*
1367          * If we are scanning right now then the parameters will
1368          * take effect when scan finishes.
1369          */
1370         if (local->scanning)
1371                 return;
1372
1373         if (conf->dynamic_ps_timeout > 0 &&
1374             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1375                 mod_timer(&local->dynamic_ps_timer, jiffies +
1376                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1377         } else {
1378                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1379                         ieee80211_send_nullfunc(local, sdata, 1);
1380
1381                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1382                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1383                         return;
1384
1385                 conf->flags |= IEEE80211_CONF_PS;
1386                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1387         }
1388 }
1389
1390 static void ieee80211_change_ps(struct ieee80211_local *local)
1391 {
1392         struct ieee80211_conf *conf = &local->hw.conf;
1393
1394         if (local->ps_sdata) {
1395                 ieee80211_enable_ps(local, local->ps_sdata);
1396         } else if (conf->flags & IEEE80211_CONF_PS) {
1397                 conf->flags &= ~IEEE80211_CONF_PS;
1398                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1399                 del_timer_sync(&local->dynamic_ps_timer);
1400                 cancel_work_sync(&local->dynamic_ps_enable_work);
1401         }
1402 }
1403
1404 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1405 {
1406         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1407         struct sta_info *sta = NULL;
1408         bool authorized = false;
1409
1410         if (!mgd->powersave)
1411                 return false;
1412
1413         if (mgd->broken_ap)
1414                 return false;
1415
1416         if (!mgd->associated)
1417                 return false;
1418
1419         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1420                 return false;
1421
1422         if (!mgd->have_beacon)
1423                 return false;
1424
1425         rcu_read_lock();
1426         sta = sta_info_get(sdata, mgd->bssid);
1427         if (sta)
1428                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1429         rcu_read_unlock();
1430
1431         return authorized;
1432 }
1433
1434 /* need to hold RTNL or interface lock */
1435 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1436 {
1437         struct ieee80211_sub_if_data *sdata, *found = NULL;
1438         int count = 0;
1439         int timeout;
1440
1441         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1442                 local->ps_sdata = NULL;
1443                 return;
1444         }
1445
1446         list_for_each_entry(sdata, &local->interfaces, list) {
1447                 if (!ieee80211_sdata_running(sdata))
1448                         continue;
1449                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1450                         /* If an AP vif is found, then disable PS
1451                          * by setting the count to zero thereby setting
1452                          * ps_sdata to NULL.
1453                          */
1454                         count = 0;
1455                         break;
1456                 }
1457                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1458                         continue;
1459                 found = sdata;
1460                 count++;
1461         }
1462
1463         if (count == 1 && ieee80211_powersave_allowed(found)) {
1464                 s32 beaconint_us;
1465
1466                 if (latency < 0)
1467                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1468
1469                 beaconint_us = ieee80211_tu_to_usec(
1470                                         found->vif.bss_conf.beacon_int);
1471
1472                 timeout = local->dynamic_ps_forced_timeout;
1473                 if (timeout < 0) {
1474                         /*
1475                          * Go to full PSM if the user configures a very low
1476                          * latency requirement.
1477                          * The 2000 second value is there for compatibility
1478                          * until the PM_QOS_NETWORK_LATENCY is configured
1479                          * with real values.
1480                          */
1481                         if (latency > (1900 * USEC_PER_MSEC) &&
1482                             latency != (2000 * USEC_PER_SEC))
1483                                 timeout = 0;
1484                         else
1485                                 timeout = 100;
1486                 }
1487                 local->hw.conf.dynamic_ps_timeout = timeout;
1488
1489                 if (beaconint_us > latency) {
1490                         local->ps_sdata = NULL;
1491                 } else {
1492                         int maxslp = 1;
1493                         u8 dtimper = found->u.mgd.dtim_period;
1494
1495                         /* If the TIM IE is invalid, pretend the value is 1 */
1496                         if (!dtimper)
1497                                 dtimper = 1;
1498                         else if (dtimper > 1)
1499                                 maxslp = min_t(int, dtimper,
1500                                                     latency / beaconint_us);
1501
1502                         local->hw.conf.max_sleep_period = maxslp;
1503                         local->hw.conf.ps_dtim_period = dtimper;
1504                         local->ps_sdata = found;
1505                 }
1506         } else {
1507                 local->ps_sdata = NULL;
1508         }
1509
1510         ieee80211_change_ps(local);
1511 }
1512
1513 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1514 {
1515         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1516
1517         if (sdata->vif.bss_conf.ps != ps_allowed) {
1518                 sdata->vif.bss_conf.ps = ps_allowed;
1519                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1520         }
1521 }
1522
1523 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1524 {
1525         struct ieee80211_local *local =
1526                 container_of(work, struct ieee80211_local,
1527                              dynamic_ps_disable_work);
1528
1529         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1530                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1531                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1532         }
1533
1534         ieee80211_wake_queues_by_reason(&local->hw,
1535                                         IEEE80211_MAX_QUEUE_MAP,
1536                                         IEEE80211_QUEUE_STOP_REASON_PS,
1537                                         false);
1538 }
1539
1540 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1541 {
1542         struct ieee80211_local *local =
1543                 container_of(work, struct ieee80211_local,
1544                              dynamic_ps_enable_work);
1545         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1546         struct ieee80211_if_managed *ifmgd;
1547         unsigned long flags;
1548         int q;
1549
1550         /* can only happen when PS was just disabled anyway */
1551         if (!sdata)
1552                 return;
1553
1554         ifmgd = &sdata->u.mgd;
1555
1556         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1557                 return;
1558
1559         if (local->hw.conf.dynamic_ps_timeout > 0) {
1560                 /* don't enter PS if TX frames are pending */
1561                 if (drv_tx_frames_pending(local)) {
1562                         mod_timer(&local->dynamic_ps_timer, jiffies +
1563                                   msecs_to_jiffies(
1564                                   local->hw.conf.dynamic_ps_timeout));
1565                         return;
1566                 }
1567
1568                 /*
1569                  * transmission can be stopped by others which leads to
1570                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1571                  * is not the actual idle state.
1572                  */
1573                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1574                 for (q = 0; q < local->hw.queues; q++) {
1575                         if (local->queue_stop_reasons[q]) {
1576                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1577                                                        flags);
1578                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1579                                           msecs_to_jiffies(
1580                                           local->hw.conf.dynamic_ps_timeout));
1581                                 return;
1582                         }
1583                 }
1584                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1585         }
1586
1587         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1588             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1589                 if (drv_tx_frames_pending(local)) {
1590                         mod_timer(&local->dynamic_ps_timer, jiffies +
1591                                   msecs_to_jiffies(
1592                                   local->hw.conf.dynamic_ps_timeout));
1593                 } else {
1594                         ieee80211_send_nullfunc(local, sdata, 1);
1595                         /* Flush to get the tx status of nullfunc frame */
1596                         ieee80211_flush_queues(local, sdata, false);
1597                 }
1598         }
1599
1600         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1601               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1602             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1603                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1604                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1605                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1606         }
1607 }
1608
1609 void ieee80211_dynamic_ps_timer(unsigned long data)
1610 {
1611         struct ieee80211_local *local = (void *) data;
1612
1613         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1614 }
1615
1616 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1617 {
1618         struct delayed_work *delayed_work =
1619                 container_of(work, struct delayed_work, work);
1620         struct ieee80211_sub_if_data *sdata =
1621                 container_of(delayed_work, struct ieee80211_sub_if_data,
1622                              dfs_cac_timer_work);
1623         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1624
1625         mutex_lock(&sdata->local->mtx);
1626         if (sdata->wdev.cac_started) {
1627                 ieee80211_vif_release_channel(sdata);
1628                 cfg80211_cac_event(sdata->dev, &chandef,
1629                                    NL80211_RADAR_CAC_FINISHED,
1630                                    GFP_KERNEL);
1631         }
1632         mutex_unlock(&sdata->local->mtx);
1633 }
1634
1635 static bool
1636 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1637 {
1638         struct ieee80211_local *local = sdata->local;
1639         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1640         bool ret = false;
1641         int ac;
1642
1643         if (local->hw.queues < IEEE80211_NUM_ACS)
1644                 return false;
1645
1646         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1647                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1648                 int non_acm_ac;
1649                 unsigned long now = jiffies;
1650
1651                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1652                     tx_tspec->admitted_time &&
1653                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1654                         tx_tspec->consumed_tx_time = 0;
1655                         tx_tspec->time_slice_start = now;
1656
1657                         if (tx_tspec->downgraded)
1658                                 tx_tspec->action =
1659                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1660                 }
1661
1662                 switch (tx_tspec->action) {
1663                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1664                         /* take the original parameters */
1665                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1666                                 sdata_err(sdata,
1667                                           "failed to set TX queue parameters for queue %d\n",
1668                                           ac);
1669                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1670                         tx_tspec->downgraded = false;
1671                         ret = true;
1672                         break;
1673                 case TX_TSPEC_ACTION_DOWNGRADE:
1674                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1675                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1676                                 ret = true;
1677                                 break;
1678                         }
1679                         /* downgrade next lower non-ACM AC */
1680                         for (non_acm_ac = ac + 1;
1681                              non_acm_ac < IEEE80211_NUM_ACS;
1682                              non_acm_ac++)
1683                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1684                                         break;
1685                         /* The loop will result in using BK even if it requires
1686                          * admission control, such configuration makes no sense
1687                          * and we have to transmit somehow - the AC selection
1688                          * does the same thing.
1689                          */
1690                         if (drv_conf_tx(local, sdata, ac,
1691                                         &sdata->tx_conf[non_acm_ac]))
1692                                 sdata_err(sdata,
1693                                           "failed to set TX queue parameters for queue %d\n",
1694                                           ac);
1695                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1696                         ret = true;
1697                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1698                                 tx_tspec->time_slice_start + HZ - now + 1);
1699                         break;
1700                 case TX_TSPEC_ACTION_NONE:
1701                         /* nothing now */
1702                         break;
1703                 }
1704         }
1705
1706         return ret;
1707 }
1708
1709 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1710 {
1711         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1712                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1713 }
1714
1715 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1716 {
1717         struct ieee80211_sub_if_data *sdata;
1718
1719         sdata = container_of(work, struct ieee80211_sub_if_data,
1720                              u.mgd.tx_tspec_wk.work);
1721         ieee80211_sta_handle_tspec_ac_params(sdata);
1722 }
1723
1724 /* MLME */
1725 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1726                                      struct ieee80211_sub_if_data *sdata,
1727                                      const u8 *wmm_param, size_t wmm_param_len)
1728 {
1729         struct ieee80211_tx_queue_params params;
1730         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1731         size_t left;
1732         int count;
1733         const u8 *pos;
1734         u8 uapsd_queues = 0;
1735
1736         if (!local->ops->conf_tx)
1737                 return false;
1738
1739         if (local->hw.queues < IEEE80211_NUM_ACS)
1740                 return false;
1741
1742         if (!wmm_param)
1743                 return false;
1744
1745         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1746                 return false;
1747
1748         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1749                 uapsd_queues = ifmgd->uapsd_queues;
1750
1751         count = wmm_param[6] & 0x0f;
1752         if (count == ifmgd->wmm_last_param_set)
1753                 return false;
1754         ifmgd->wmm_last_param_set = count;
1755
1756         pos = wmm_param + 8;
1757         left = wmm_param_len - 8;
1758
1759         memset(&params, 0, sizeof(params));
1760
1761         sdata->wmm_acm = 0;
1762         for (; left >= 4; left -= 4, pos += 4) {
1763                 int aci = (pos[0] >> 5) & 0x03;
1764                 int acm = (pos[0] >> 4) & 0x01;
1765                 bool uapsd = false;
1766                 int queue;
1767
1768                 switch (aci) {
1769                 case 1: /* AC_BK */
1770                         queue = 3;
1771                         if (acm)
1772                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1773                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1774                                 uapsd = true;
1775                         break;
1776                 case 2: /* AC_VI */
1777                         queue = 1;
1778                         if (acm)
1779                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1780                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1781                                 uapsd = true;
1782                         break;
1783                 case 3: /* AC_VO */
1784                         queue = 0;
1785                         if (acm)
1786                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1787                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1788                                 uapsd = true;
1789                         break;
1790                 case 0: /* AC_BE */
1791                 default:
1792                         queue = 2;
1793                         if (acm)
1794                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1795                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1796                                 uapsd = true;
1797                         break;
1798                 }
1799
1800                 params.aifs = pos[0] & 0x0f;
1801                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1802                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1803                 params.txop = get_unaligned_le16(pos + 2);
1804                 params.acm = acm;
1805                 params.uapsd = uapsd;
1806
1807                 mlme_dbg(sdata,
1808                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1809                          queue, aci, acm,
1810                          params.aifs, params.cw_min, params.cw_max,
1811                          params.txop, params.uapsd,
1812                          ifmgd->tx_tspec[queue].downgraded);
1813                 sdata->tx_conf[queue] = params;
1814                 if (!ifmgd->tx_tspec[queue].downgraded &&
1815                     drv_conf_tx(local, sdata, queue, &params))
1816                         sdata_err(sdata,
1817                                   "failed to set TX queue parameters for queue %d\n",
1818                                   queue);
1819         }
1820
1821         /* enable WMM or activate new settings */
1822         sdata->vif.bss_conf.qos = true;
1823         return true;
1824 }
1825
1826 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1827 {
1828         lockdep_assert_held(&sdata->local->mtx);
1829
1830         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1831         ieee80211_run_deferred_scan(sdata->local);
1832 }
1833
1834 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1835 {
1836         mutex_lock(&sdata->local->mtx);
1837         __ieee80211_stop_poll(sdata);
1838         mutex_unlock(&sdata->local->mtx);
1839 }
1840
1841 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1842                                            u16 capab, bool erp_valid, u8 erp)
1843 {
1844         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1845         u32 changed = 0;
1846         bool use_protection;
1847         bool use_short_preamble;
1848         bool use_short_slot;
1849
1850         if (erp_valid) {
1851                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1852                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1853         } else {
1854                 use_protection = false;
1855                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1856         }
1857
1858         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1859         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1860                 use_short_slot = true;
1861
1862         if (use_protection != bss_conf->use_cts_prot) {
1863                 bss_conf->use_cts_prot = use_protection;
1864                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1865         }
1866
1867         if (use_short_preamble != bss_conf->use_short_preamble) {
1868                 bss_conf->use_short_preamble = use_short_preamble;
1869                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1870         }
1871
1872         if (use_short_slot != bss_conf->use_short_slot) {
1873                 bss_conf->use_short_slot = use_short_slot;
1874                 changed |= BSS_CHANGED_ERP_SLOT;
1875         }
1876
1877         return changed;
1878 }
1879
1880 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1881                                      struct cfg80211_bss *cbss,
1882                                      u32 bss_info_changed)
1883 {
1884         struct ieee80211_bss *bss = (void *)cbss->priv;
1885         struct ieee80211_local *local = sdata->local;
1886         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1887
1888         bss_info_changed |= BSS_CHANGED_ASSOC;
1889         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1890                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1891
1892         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1893                 beacon_loss_count * bss_conf->beacon_int));
1894
1895         sdata->u.mgd.associated = cbss;
1896         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1897
1898         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1899
1900         if (sdata->vif.p2p) {
1901                 const struct cfg80211_bss_ies *ies;
1902
1903                 rcu_read_lock();
1904                 ies = rcu_dereference(cbss->ies);
1905                 if (ies) {
1906                         int ret;
1907
1908                         ret = cfg80211_get_p2p_attr(
1909                                         ies->data, ies->len,
1910                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1911                                         (u8 *) &bss_conf->p2p_noa_attr,
1912                                         sizeof(bss_conf->p2p_noa_attr));
1913                         if (ret >= 2) {
1914                                 sdata->u.mgd.p2p_noa_index =
1915                                         bss_conf->p2p_noa_attr.index;
1916                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1917                         }
1918                 }
1919                 rcu_read_unlock();
1920         }
1921
1922         /* just to be sure */
1923         ieee80211_stop_poll(sdata);
1924
1925         ieee80211_led_assoc(local, 1);
1926
1927         if (sdata->u.mgd.have_beacon) {
1928                 /*
1929                  * If the AP is buggy we may get here with no DTIM period
1930                  * known, so assume it's 1 which is the only safe assumption
1931                  * in that case, although if the TIM IE is broken powersave
1932                  * probably just won't work at all.
1933                  */
1934                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1935                 bss_conf->beacon_rate = bss->beacon_rate;
1936                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1937         } else {
1938                 bss_conf->beacon_rate = NULL;
1939                 bss_conf->dtim_period = 0;
1940         }
1941
1942         bss_conf->assoc = 1;
1943
1944         /* Tell the driver to monitor connection quality (if supported) */
1945         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1946             bss_conf->cqm_rssi_thold)
1947                 bss_info_changed |= BSS_CHANGED_CQM;
1948
1949         /* Enable ARP filtering */
1950         if (bss_conf->arp_addr_cnt)
1951                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1952
1953         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1954
1955         mutex_lock(&local->iflist_mtx);
1956         ieee80211_recalc_ps(local, -1);
1957         mutex_unlock(&local->iflist_mtx);
1958
1959         ieee80211_recalc_smps(sdata);
1960         ieee80211_recalc_ps_vif(sdata);
1961
1962         netif_carrier_on(sdata->dev);
1963 }
1964
1965 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1966                                    u16 stype, u16 reason, bool tx,
1967                                    u8 *frame_buf)
1968 {
1969         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1970         struct ieee80211_local *local = sdata->local;
1971         u32 changed = 0;
1972
1973         sdata_assert_lock(sdata);
1974
1975         if (WARN_ON_ONCE(tx && !frame_buf))
1976                 return;
1977
1978         if (WARN_ON(!ifmgd->associated))
1979                 return;
1980
1981         ieee80211_stop_poll(sdata);
1982
1983         ifmgd->associated = NULL;
1984         netif_carrier_off(sdata->dev);
1985
1986         /*
1987          * if we want to get out of ps before disassoc (why?) we have
1988          * to do it before sending disassoc, as otherwise the null-packet
1989          * won't be valid.
1990          */
1991         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1992                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1993                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1994         }
1995         local->ps_sdata = NULL;
1996
1997         /* disable per-vif ps */
1998         ieee80211_recalc_ps_vif(sdata);
1999
2000         /* make sure ongoing transmission finishes */
2001         synchronize_net();
2002
2003         /*
2004          * drop any frame before deauth/disassoc, this can be data or
2005          * management frame. Since we are disconnecting, we should not
2006          * insist sending these frames which can take time and delay
2007          * the disconnection and possible the roaming.
2008          */
2009         if (tx)
2010                 ieee80211_flush_queues(local, sdata, true);
2011
2012         /* deauthenticate/disassociate now */
2013         if (tx || frame_buf)
2014                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2015                                                reason, tx, frame_buf);
2016
2017         /* flush out frame - make sure the deauth was actually sent */
2018         if (tx)
2019                 ieee80211_flush_queues(local, sdata, false);
2020
2021         /* clear bssid only after building the needed mgmt frames */
2022         memset(ifmgd->bssid, 0, ETH_ALEN);
2023
2024         /* remove AP and TDLS peers */
2025         sta_info_flush(sdata);
2026
2027         /* finally reset all BSS / config parameters */
2028         changed |= ieee80211_reset_erp_info(sdata);
2029
2030         ieee80211_led_assoc(local, 0);
2031         changed |= BSS_CHANGED_ASSOC;
2032         sdata->vif.bss_conf.assoc = false;
2033
2034         ifmgd->p2p_noa_index = -1;
2035         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2036                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2037
2038         /* on the next assoc, re-program HT/VHT parameters */
2039         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2040         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2041         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2042         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2043
2044         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2045
2046         del_timer_sync(&local->dynamic_ps_timer);
2047         cancel_work_sync(&local->dynamic_ps_enable_work);
2048
2049         /* Disable ARP filtering */
2050         if (sdata->vif.bss_conf.arp_addr_cnt)
2051                 changed |= BSS_CHANGED_ARP_FILTER;
2052
2053         sdata->vif.bss_conf.qos = false;
2054         changed |= BSS_CHANGED_QOS;
2055
2056         /* The BSSID (not really interesting) and HT changed */
2057         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2058         ieee80211_bss_info_change_notify(sdata, changed);
2059
2060         /* disassociated - set to defaults now */
2061         ieee80211_set_wmm_default(sdata, false);
2062
2063         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2064         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2065         del_timer_sync(&sdata->u.mgd.timer);
2066         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2067
2068         sdata->vif.bss_conf.dtim_period = 0;
2069         sdata->vif.bss_conf.beacon_rate = NULL;
2070
2071         ifmgd->have_beacon = false;
2072
2073         ifmgd->flags = 0;
2074         mutex_lock(&local->mtx);
2075         ieee80211_vif_release_channel(sdata);
2076
2077         sdata->vif.csa_active = false;
2078         ifmgd->csa_waiting_bcn = false;
2079         if (sdata->csa_block_tx) {
2080                 ieee80211_wake_vif_queues(local, sdata,
2081                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2082                 sdata->csa_block_tx = false;
2083         }
2084         mutex_unlock(&local->mtx);
2085
2086         /* existing TX TSPEC sessions no longer exist */
2087         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2088         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2089
2090         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2091 }
2092
2093 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2094                              struct ieee80211_hdr *hdr)
2095 {
2096         /*
2097          * We can postpone the mgd.timer whenever receiving unicast frames
2098          * from AP because we know that the connection is working both ways
2099          * at that time. But multicast frames (and hence also beacons) must
2100          * be ignored here, because we need to trigger the timer during
2101          * data idle periods for sending the periodic probe request to the
2102          * AP we're connected to.
2103          */
2104         if (is_multicast_ether_addr(hdr->addr1))
2105                 return;
2106
2107         ieee80211_sta_reset_conn_monitor(sdata);
2108 }
2109
2110 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2111 {
2112         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2113         struct ieee80211_local *local = sdata->local;
2114
2115         mutex_lock(&local->mtx);
2116         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2117                 goto out;
2118
2119         __ieee80211_stop_poll(sdata);
2120
2121         mutex_lock(&local->iflist_mtx);
2122         ieee80211_recalc_ps(local, -1);
2123         mutex_unlock(&local->iflist_mtx);
2124
2125         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2126                 goto out;
2127
2128         /*
2129          * We've received a probe response, but are not sure whether
2130          * we have or will be receiving any beacons or data, so let's
2131          * schedule the timers again, just in case.
2132          */
2133         ieee80211_sta_reset_beacon_monitor(sdata);
2134
2135         mod_timer(&ifmgd->conn_mon_timer,
2136                   round_jiffies_up(jiffies +
2137                                    IEEE80211_CONNECTION_IDLE_TIME));
2138 out:
2139         mutex_unlock(&local->mtx);
2140 }
2141
2142 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2143                                            struct ieee80211_hdr *hdr,
2144                                            u16 tx_time)
2145 {
2146         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2147         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2148         int ac = ieee80211_ac_from_tid(tid);
2149         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2150         unsigned long now = jiffies;
2151
2152         if (likely(!tx_tspec->admitted_time))
2153                 return;
2154
2155         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2156                 tx_tspec->consumed_tx_time = 0;
2157                 tx_tspec->time_slice_start = now;
2158
2159                 if (tx_tspec->downgraded) {
2160                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2161                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2162                 }
2163         }
2164
2165         if (tx_tspec->downgraded)
2166                 return;
2167
2168         tx_tspec->consumed_tx_time += tx_time;
2169
2170         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2171                 tx_tspec->downgraded = true;
2172                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2173                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2174         }
2175 }
2176
2177 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2178                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2179 {
2180         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2181
2182         if (!ieee80211_is_data(hdr->frame_control))
2183             return;
2184
2185         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2186             sdata->u.mgd.probe_send_count > 0) {
2187                 if (ack)
2188                         ieee80211_sta_reset_conn_monitor(sdata);
2189                 else
2190                         sdata->u.mgd.nullfunc_failed = true;
2191                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2192                 return;
2193         }
2194
2195         if (ack)
2196                 ieee80211_sta_reset_conn_monitor(sdata);
2197 }
2198
2199 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2200 {
2201         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2202         const u8 *ssid;
2203         u8 *dst = ifmgd->associated->bssid;
2204         u8 unicast_limit = max(1, max_probe_tries - 3);
2205
2206         /*
2207          * Try sending broadcast probe requests for the last three
2208          * probe requests after the first ones failed since some
2209          * buggy APs only support broadcast probe requests.
2210          */
2211         if (ifmgd->probe_send_count >= unicast_limit)
2212                 dst = NULL;
2213
2214         /*
2215          * When the hardware reports an accurate Tx ACK status, it's
2216          * better to send a nullfunc frame instead of a probe request,
2217          * as it will kick us off the AP quickly if we aren't associated
2218          * anymore. The timeout will be reset if the frame is ACKed by
2219          * the AP.
2220          */
2221         ifmgd->probe_send_count++;
2222
2223         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2224                 ifmgd->nullfunc_failed = false;
2225                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2226         } else {
2227                 int ssid_len;
2228
2229                 rcu_read_lock();
2230                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2231                 if (WARN_ON_ONCE(ssid == NULL))
2232                         ssid_len = 0;
2233                 else
2234                         ssid_len = ssid[1];
2235
2236                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2237                                          ssid + 2, ssid_len, NULL,
2238                                          0, (u32) -1, true, 0,
2239                                          ifmgd->associated->channel, false);
2240                 rcu_read_unlock();
2241         }
2242
2243         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2244         run_again(sdata, ifmgd->probe_timeout);
2245 }
2246
2247 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2248                                    bool beacon)
2249 {
2250         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2251         bool already = false;
2252
2253         if (!ieee80211_sdata_running(sdata))
2254                 return;
2255
2256         sdata_lock(sdata);
2257
2258         if (!ifmgd->associated)
2259                 goto out;
2260
2261         mutex_lock(&sdata->local->mtx);
2262
2263         if (sdata->local->tmp_channel || sdata->local->scanning) {
2264                 mutex_unlock(&sdata->local->mtx);
2265                 goto out;
2266         }
2267
2268         if (beacon) {
2269                 mlme_dbg_ratelimited(sdata,
2270                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2271                                      beacon_loss_count);
2272
2273                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2274         }
2275
2276         /*
2277          * The driver/our work has already reported this event or the
2278          * connection monitoring has kicked in and we have already sent
2279          * a probe request. Or maybe the AP died and the driver keeps
2280          * reporting until we disassociate...
2281          *
2282          * In either case we have to ignore the current call to this
2283          * function (except for setting the correct probe reason bit)
2284          * because otherwise we would reset the timer every time and
2285          * never check whether we received a probe response!
2286          */
2287         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2288                 already = true;
2289
2290         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2291
2292         mutex_unlock(&sdata->local->mtx);
2293
2294         if (already)
2295                 goto out;
2296
2297         mutex_lock(&sdata->local->iflist_mtx);
2298         ieee80211_recalc_ps(sdata->local, -1);
2299         mutex_unlock(&sdata->local->iflist_mtx);
2300
2301         ifmgd->probe_send_count = 0;
2302         ieee80211_mgd_probe_ap_send(sdata);
2303  out:
2304         sdata_unlock(sdata);
2305 }
2306
2307 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2308                                           struct ieee80211_vif *vif)
2309 {
2310         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2311         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2312         struct cfg80211_bss *cbss;
2313         struct sk_buff *skb;
2314         const u8 *ssid;
2315         int ssid_len;
2316
2317         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2318                 return NULL;
2319
2320         sdata_assert_lock(sdata);
2321
2322         if (ifmgd->associated)
2323                 cbss = ifmgd->associated;
2324         else if (ifmgd->auth_data)
2325                 cbss = ifmgd->auth_data->bss;
2326         else if (ifmgd->assoc_data)
2327                 cbss = ifmgd->assoc_data->bss;
2328         else
2329                 return NULL;
2330
2331         rcu_read_lock();
2332         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2333         if (WARN_ON_ONCE(ssid == NULL))
2334                 ssid_len = 0;
2335         else
2336                 ssid_len = ssid[1];
2337
2338         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2339                                         (u32) -1, cbss->channel,
2340                                         ssid + 2, ssid_len,
2341                                         NULL, 0, true);
2342         rcu_read_unlock();
2343
2344         return skb;
2345 }
2346 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2347
2348 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2349                                         const u8 *buf, size_t len, bool tx,
2350                                         u16 reason)
2351 {
2352         struct ieee80211_event event = {
2353                 .type = MLME_EVENT,
2354                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2355                 .u.mlme.reason = reason,
2356         };
2357
2358         if (tx)
2359                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2360         else
2361                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2362
2363         drv_event_callback(sdata->local, sdata, &event);
2364 }
2365
2366 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2367 {
2368         struct ieee80211_local *local = sdata->local;
2369         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2370         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2371
2372         sdata_lock(sdata);
2373         if (!ifmgd->associated) {
2374                 sdata_unlock(sdata);
2375                 return;
2376         }
2377
2378         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2379                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2380                                true, frame_buf);
2381         mutex_lock(&local->mtx);
2382         sdata->vif.csa_active = false;
2383         ifmgd->csa_waiting_bcn = false;
2384         if (sdata->csa_block_tx) {
2385                 ieee80211_wake_vif_queues(local, sdata,
2386                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2387                 sdata->csa_block_tx = false;
2388         }
2389         mutex_unlock(&local->mtx);
2390
2391         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2392                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2393
2394         sdata_unlock(sdata);
2395 }
2396
2397 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2398 {
2399         struct ieee80211_sub_if_data *sdata =
2400                 container_of(work, struct ieee80211_sub_if_data,
2401                              u.mgd.beacon_connection_loss_work);
2402         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2403         struct sta_info *sta;
2404
2405         if (ifmgd->associated) {
2406                 rcu_read_lock();
2407                 sta = sta_info_get(sdata, ifmgd->bssid);
2408                 if (sta)
2409                         sta->beacon_loss_count++;
2410                 rcu_read_unlock();
2411         }
2412
2413         if (ifmgd->connection_loss) {
2414                 sdata_info(sdata, "Connection to AP %pM lost\n",
2415                            ifmgd->bssid);
2416                 __ieee80211_disconnect(sdata);
2417         } else {
2418                 ieee80211_mgd_probe_ap(sdata, true);
2419         }
2420 }
2421
2422 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2423 {
2424         struct ieee80211_sub_if_data *sdata =
2425                 container_of(work, struct ieee80211_sub_if_data,
2426                              u.mgd.csa_connection_drop_work);
2427
2428         __ieee80211_disconnect(sdata);
2429 }
2430
2431 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2432 {
2433         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2434         struct ieee80211_hw *hw = &sdata->local->hw;
2435
2436         trace_api_beacon_loss(sdata);
2437
2438         sdata->u.mgd.connection_loss = false;
2439         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2440 }
2441 EXPORT_SYMBOL(ieee80211_beacon_loss);
2442
2443 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2444 {
2445         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2446         struct ieee80211_hw *hw = &sdata->local->hw;
2447
2448         trace_api_connection_loss(sdata);
2449
2450         sdata->u.mgd.connection_loss = true;
2451         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2452 }
2453 EXPORT_SYMBOL(ieee80211_connection_loss);
2454
2455
2456 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2457                                         bool assoc)
2458 {
2459         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2460
2461         sdata_assert_lock(sdata);
2462
2463         if (!assoc) {
2464                 /*
2465                  * we are not authenticated yet, the only timer that could be
2466                  * running is the timeout for the authentication response which
2467                  * which is not relevant anymore.
2468                  */
2469                 del_timer_sync(&sdata->u.mgd.timer);
2470                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2471
2472                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2473                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2474                 sdata->u.mgd.flags = 0;
2475                 mutex_lock(&sdata->local->mtx);
2476                 ieee80211_vif_release_channel(sdata);
2477                 mutex_unlock(&sdata->local->mtx);
2478         }
2479
2480         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2481         kfree(auth_data);
2482         sdata->u.mgd.auth_data = NULL;
2483 }
2484
2485 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2486                                      struct ieee80211_mgmt *mgmt, size_t len)
2487 {
2488         struct ieee80211_local *local = sdata->local;
2489         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2490         u8 *pos;
2491         struct ieee802_11_elems elems;
2492         u32 tx_flags = 0;
2493
2494         pos = mgmt->u.auth.variable;
2495         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2496         if (!elems.challenge)
2497                 return;
2498         auth_data->expected_transaction = 4;
2499         drv_mgd_prepare_tx(sdata->local, sdata);
2500         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2501                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2502                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2503         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2504                             elems.challenge - 2, elems.challenge_len + 2,
2505                             auth_data->bss->bssid, auth_data->bss->bssid,
2506                             auth_data->key, auth_data->key_len,
2507                             auth_data->key_idx, tx_flags);
2508 }
2509
2510 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2511                                    struct ieee80211_mgmt *mgmt, size_t len)
2512 {
2513         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2514         u8 bssid[ETH_ALEN];
2515         u16 auth_alg, auth_transaction, status_code;
2516         struct sta_info *sta;
2517         struct ieee80211_event event = {
2518                 .type = MLME_EVENT,
2519                 .u.mlme.data = AUTH_EVENT,
2520         };
2521
2522         sdata_assert_lock(sdata);
2523
2524         if (len < 24 + 6)
2525                 return;
2526
2527         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2528                 return;
2529
2530         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2531
2532         if (!ether_addr_equal(bssid, mgmt->bssid))
2533                 return;
2534
2535         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2536         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2537         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2538
2539         if (auth_alg != ifmgd->auth_data->algorithm ||
2540             auth_transaction != ifmgd->auth_data->expected_transaction) {
2541                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2542                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2543                            auth_transaction,
2544                            ifmgd->auth_data->expected_transaction);
2545                 return;
2546         }
2547
2548         if (status_code != WLAN_STATUS_SUCCESS) {
2549                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2550                            mgmt->sa, status_code);
2551                 ieee80211_destroy_auth_data(sdata, false);
2552                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2553                 event.u.mlme.status = MLME_DENIED;
2554                 event.u.mlme.reason = status_code;
2555                 drv_event_callback(sdata->local, sdata, &event);
2556                 return;
2557         }
2558
2559         switch (ifmgd->auth_data->algorithm) {
2560         case WLAN_AUTH_OPEN:
2561         case WLAN_AUTH_LEAP:
2562         case WLAN_AUTH_FT:
2563         case WLAN_AUTH_SAE:
2564                 break;
2565         case WLAN_AUTH_SHARED_KEY:
2566                 if (ifmgd->auth_data->expected_transaction != 4) {
2567                         ieee80211_auth_challenge(sdata, mgmt, len);
2568                         /* need another frame */
2569                         return;
2570                 }
2571                 break;
2572         default:
2573                 WARN_ONCE(1, "invalid auth alg %d",
2574                           ifmgd->auth_data->algorithm);
2575                 return;
2576         }
2577
2578         event.u.mlme.status = MLME_SUCCESS;
2579         drv_event_callback(sdata->local, sdata, &event);
2580         sdata_info(sdata, "authenticated\n");
2581         ifmgd->auth_data->done = true;
2582         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2583         ifmgd->auth_data->timeout_started = true;
2584         run_again(sdata, ifmgd->auth_data->timeout);
2585
2586         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2587             ifmgd->auth_data->expected_transaction != 2) {
2588                 /*
2589                  * Report auth frame to user space for processing since another
2590                  * round of Authentication frames is still needed.
2591                  */
2592                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2593                 return;
2594         }
2595
2596         /* move station state to auth */
2597         mutex_lock(&sdata->local->sta_mtx);
2598         sta = sta_info_get(sdata, bssid);
2599         if (!sta) {
2600                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2601                 goto out_err;
2602         }
2603         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2604                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2605                 goto out_err;
2606         }
2607         mutex_unlock(&sdata->local->sta_mtx);
2608
2609         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2610         return;
2611  out_err:
2612         mutex_unlock(&sdata->local->sta_mtx);
2613         /* ignore frame -- wait for timeout */
2614 }
2615
2616 #define case_WLAN(type) \
2617         case WLAN_REASON_##type: return #type
2618
2619 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2620 {
2621         switch (reason_code) {
2622         case_WLAN(UNSPECIFIED);
2623         case_WLAN(PREV_AUTH_NOT_VALID);
2624         case_WLAN(DEAUTH_LEAVING);
2625         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2626         case_WLAN(DISASSOC_AP_BUSY);
2627         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2628         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2629         case_WLAN(DISASSOC_STA_HAS_LEFT);
2630         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2631         case_WLAN(DISASSOC_BAD_POWER);
2632         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2633         case_WLAN(INVALID_IE);
2634         case_WLAN(MIC_FAILURE);
2635         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2636         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2637         case_WLAN(IE_DIFFERENT);
2638         case_WLAN(INVALID_GROUP_CIPHER);
2639         case_WLAN(INVALID_PAIRWISE_CIPHER);
2640         case_WLAN(INVALID_AKMP);
2641         case_WLAN(UNSUPP_RSN_VERSION);
2642         case_WLAN(INVALID_RSN_IE_CAP);
2643         case_WLAN(IEEE8021X_FAILED);
2644         case_WLAN(CIPHER_SUITE_REJECTED);
2645         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2646         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2647         case_WLAN(DISASSOC_LOW_ACK);
2648         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2649         case_WLAN(QSTA_LEAVE_QBSS);
2650         case_WLAN(QSTA_NOT_USE);
2651         case_WLAN(QSTA_REQUIRE_SETUP);
2652         case_WLAN(QSTA_TIMEOUT);
2653         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2654         case_WLAN(MESH_PEER_CANCELED);
2655         case_WLAN(MESH_MAX_PEERS);
2656         case_WLAN(MESH_CONFIG);
2657         case_WLAN(MESH_CLOSE);
2658         case_WLAN(MESH_MAX_RETRIES);
2659         case_WLAN(MESH_CONFIRM_TIMEOUT);
2660         case_WLAN(MESH_INVALID_GTK);
2661         case_WLAN(MESH_INCONSISTENT_PARAM);
2662         case_WLAN(MESH_INVALID_SECURITY);
2663         case_WLAN(MESH_PATH_ERROR);
2664         case_WLAN(MESH_PATH_NOFORWARD);
2665         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2666         case_WLAN(MAC_EXISTS_IN_MBSS);
2667         case_WLAN(MESH_CHAN_REGULATORY);
2668         case_WLAN(MESH_CHAN);
2669         default: return "<unknown>";
2670         }
2671 }
2672
2673 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2674                                      struct ieee80211_mgmt *mgmt, size_t len)
2675 {
2676         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2677         const u8 *bssid = NULL;
2678         u16 reason_code;
2679
2680         sdata_assert_lock(sdata);
2681
2682         if (len < 24 + 2)
2683                 return;
2684
2685         if (!ifmgd->associated ||
2686             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2687                 return;
2688
2689         bssid = ifmgd->associated->bssid;
2690
2691         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2692
2693         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2694                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2695
2696         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2697
2698         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2699 }
2700
2701
2702 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2703                                        struct ieee80211_mgmt *mgmt, size_t len)
2704 {
2705         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2706         u16 reason_code;
2707
2708         sdata_assert_lock(sdata);
2709
2710         if (len < 24 + 2)
2711                 return;
2712
2713         if (!ifmgd->associated ||
2714             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2715                 return;
2716
2717         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2718
2719         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2720                    mgmt->sa, reason_code);
2721
2722         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2723
2724         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2725 }
2726
2727 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2728                                 u8 *supp_rates, unsigned int supp_rates_len,
2729                                 u32 *rates, u32 *basic_rates,
2730                                 bool *have_higher_than_11mbit,
2731                                 int *min_rate, int *min_rate_index,
2732                                 int shift, u32 rate_flags)
2733 {
2734         int i, j;
2735
2736         for (i = 0; i < supp_rates_len; i++) {
2737                 int rate = supp_rates[i] & 0x7f;
2738                 bool is_basic = !!(supp_rates[i] & 0x80);
2739
2740                 if ((rate * 5 * (1 << shift)) > 110)
2741                         *have_higher_than_11mbit = true;
2742
2743                 /*
2744                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2745                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2746                  *
2747                  * Note: Even through the membership selector and the basic
2748                  *       rate flag share the same bit, they are not exactly
2749                  *       the same.
2750                  */
2751                 if (!!(supp_rates[i] & 0x80) &&
2752                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2753                         continue;
2754
2755                 for (j = 0; j < sband->n_bitrates; j++) {
2756                         struct ieee80211_rate *br;
2757                         int brate;
2758
2759                         br = &sband->bitrates[j];
2760                         if ((rate_flags & br->flags) != rate_flags)
2761                                 continue;
2762
2763                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2764                         if (brate == rate) {
2765                                 *rates |= BIT(j);
2766                                 if (is_basic)
2767                                         *basic_rates |= BIT(j);
2768                                 if ((rate * 5) < *min_rate) {
2769                                         *min_rate = rate * 5;
2770                                         *min_rate_index = j;
2771                                 }
2772                                 break;
2773                         }
2774                 }
2775         }
2776 }
2777
2778 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2779                                          bool assoc)
2780 {
2781         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2782
2783         sdata_assert_lock(sdata);
2784
2785         if (!assoc) {
2786                 /*
2787                  * we are not associated yet, the only timer that could be
2788                  * running is the timeout for the association response which
2789                  * which is not relevant anymore.
2790                  */
2791                 del_timer_sync(&sdata->u.mgd.timer);
2792                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2793
2794                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2795                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2796                 sdata->u.mgd.flags = 0;
2797                 mutex_lock(&sdata->local->mtx);
2798                 ieee80211_vif_release_channel(sdata);
2799                 mutex_unlock(&sdata->local->mtx);
2800         }
2801
2802         kfree(assoc_data);
2803         sdata->u.mgd.assoc_data = NULL;
2804 }
2805
2806 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2807                                     struct cfg80211_bss *cbss,
2808                                     struct ieee80211_mgmt *mgmt, size_t len)
2809 {
2810         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2811         struct ieee80211_local *local = sdata->local;
2812         struct ieee80211_supported_band *sband;
2813         struct sta_info *sta;
2814         u8 *pos;
2815         u16 capab_info, aid;
2816         struct ieee802_11_elems elems;
2817         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2818         const struct cfg80211_bss_ies *bss_ies = NULL;
2819         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2820         u32 changed = 0;
2821         int err;
2822         bool ret;
2823
2824         /* AssocResp and ReassocResp have identical structure */
2825
2826         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2827         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2828
2829         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2830                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2831                            aid);
2832         aid &= ~(BIT(15) | BIT(14));
2833
2834         ifmgd->broken_ap = false;
2835
2836         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2837                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2838                            aid);
2839                 aid = 0;
2840                 ifmgd->broken_ap = true;
2841         }
2842
2843         pos = mgmt->u.assoc_resp.variable;
2844         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2845
2846         if (!elems.supp_rates) {
2847                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2848                 return false;
2849         }
2850
2851         ifmgd->aid = aid;
2852         ifmgd->tdls_chan_switch_prohibited =
2853                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2854                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2855
2856         /*
2857          * Some APs are erroneously not including some information in their
2858          * (re)association response frames. Try to recover by using the data
2859          * from the beacon or probe response. This seems to afflict mobile
2860          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2861          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2862          */
2863         if ((assoc_data->wmm && !elems.wmm_param) ||
2864             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2865              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2866             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2867              (!elems.vht_cap_elem || !elems.vht_operation))) {
2868                 const struct cfg80211_bss_ies *ies;
2869                 struct ieee802_11_elems bss_elems;
2870
2871                 rcu_read_lock();
2872                 ies = rcu_dereference(cbss->ies);
2873                 if (ies)
2874                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2875                                           GFP_ATOMIC);
2876                 rcu_read_unlock();
2877                 if (!bss_ies)
2878                         return false;
2879
2880                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2881                                        false, &bss_elems);
2882                 if (assoc_data->wmm &&
2883                     !elems.wmm_param && bss_elems.wmm_param) {
2884                         elems.wmm_param = bss_elems.wmm_param;
2885                         sdata_info(sdata,
2886                                    "AP bug: WMM param missing from AssocResp\n");
2887                 }
2888
2889                 /*
2890                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2891                  * have to include the IEs in the (re)association response.
2892                  */
2893                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2894                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2895                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2896                         sdata_info(sdata,
2897                                    "AP bug: HT capability missing from AssocResp\n");
2898                 }
2899                 if (!elems.ht_operation && bss_elems.ht_operation &&
2900                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2901                         elems.ht_operation = bss_elems.ht_operation;
2902                         sdata_info(sdata,
2903                                    "AP bug: HT operation missing from AssocResp\n");
2904                 }
2905                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2906                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2907                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2908                         sdata_info(sdata,
2909                                    "AP bug: VHT capa missing from AssocResp\n");
2910                 }
2911                 if (!elems.vht_operation && bss_elems.vht_operation &&
2912                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2913                         elems.vht_operation = bss_elems.vht_operation;
2914                         sdata_info(sdata,
2915                                    "AP bug: VHT operation missing from AssocResp\n");
2916                 }
2917         }
2918
2919         /*
2920          * We previously checked these in the beacon/probe response, so
2921          * they should be present here. This is just a safety net.
2922          */
2923         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2924             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2925                 sdata_info(sdata,
2926                            "HT AP is missing WMM params or HT capability/operation\n");
2927                 ret = false;
2928                 goto out;
2929         }
2930
2931         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2932             (!elems.vht_cap_elem || !elems.vht_operation)) {
2933                 sdata_info(sdata,
2934                            "VHT AP is missing VHT capability/operation\n");
2935                 ret = false;
2936                 goto out;
2937         }
2938
2939         mutex_lock(&sdata->local->sta_mtx);
2940         /*
2941          * station info was already allocated and inserted before
2942          * the association and should be available to us
2943          */
2944         sta = sta_info_get(sdata, cbss->bssid);
2945         if (WARN_ON(!sta)) {
2946                 mutex_unlock(&sdata->local->sta_mtx);
2947                 ret = false;
2948                 goto out;
2949         }
2950
2951         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2952
2953         /* Set up internal HT/VHT capabilities */
2954         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2955                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2956                                                   elems.ht_cap_elem, sta);
2957
2958         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2959                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2960                                                     elems.vht_cap_elem, sta);
2961
2962         /*
2963          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2964          * in their association response, so ignore that data for our own
2965          * configuration. If it changed since the last beacon, we'll get the
2966          * next beacon and update then.
2967          */
2968
2969         /*
2970          * If an operating mode notification IE is present, override the
2971          * NSS calculation (that would be done in rate_control_rate_init())
2972          * and use the # of streams from that element.
2973          */
2974         if (elems.opmode_notif &&
2975             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2976                 u8 nss;
2977
2978                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2979                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2980                 nss += 1;
2981                 sta->sta.rx_nss = nss;
2982         }
2983
2984         rate_control_rate_init(sta);
2985
2986         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
2987                 set_sta_flag(sta, WLAN_STA_MFP);
2988                 sta->sta.mfp = true;
2989         } else {
2990                 sta->sta.mfp = false;
2991         }
2992
2993         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
2994
2995         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2996         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2997                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2998         if (err) {
2999                 sdata_info(sdata,
3000                            "failed to move station %pM to desired state\n",
3001                            sta->sta.addr);
3002                 WARN_ON(__sta_info_destroy(sta));
3003                 mutex_unlock(&sdata->local->sta_mtx);
3004                 ret = false;
3005                 goto out;
3006         }
3007
3008         mutex_unlock(&sdata->local->sta_mtx);
3009
3010         /*
3011          * Always handle WMM once after association regardless
3012          * of the first value the AP uses. Setting -1 here has
3013          * that effect because the AP values is an unsigned
3014          * 4-bit value.
3015          */
3016         ifmgd->wmm_last_param_set = -1;
3017
3018         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
3019                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3020                                          elems.wmm_param_len);
3021         else
3022                 ieee80211_set_wmm_default(sdata, false);
3023         changed |= BSS_CHANGED_QOS;
3024
3025         /* set AID and assoc capability,
3026          * ieee80211_set_associated() will tell the driver */
3027         bss_conf->aid = aid;
3028         bss_conf->assoc_capability = capab_info;
3029         ieee80211_set_associated(sdata, cbss, changed);
3030
3031         /*
3032          * If we're using 4-addr mode, let the AP know that we're
3033          * doing so, so that it can create the STA VLAN on its side
3034          */
3035         if (ifmgd->use_4addr)
3036                 ieee80211_send_4addr_nullfunc(local, sdata);
3037
3038         /*
3039          * Start timer to probe the connection to the AP now.
3040          * Also start the timer that will detect beacon loss.
3041          */
3042         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3043         ieee80211_sta_reset_beacon_monitor(sdata);
3044
3045         ret = true;
3046  out:
3047         kfree(bss_ies);
3048         return ret;
3049 }
3050
3051 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3052                                          struct ieee80211_mgmt *mgmt,
3053                                          size_t len)
3054 {
3055         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3056         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3057         u16 capab_info, status_code, aid;
3058         struct ieee802_11_elems elems;
3059         int ac, uapsd_queues = -1;
3060         u8 *pos;
3061         bool reassoc;
3062         struct cfg80211_bss *bss;
3063         struct ieee80211_event event = {
3064                 .type = MLME_EVENT,
3065                 .u.mlme.data = ASSOC_EVENT,
3066         };
3067
3068         sdata_assert_lock(sdata);
3069
3070         if (!assoc_data)
3071                 return;
3072         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3073                 return;
3074
3075         /*
3076          * AssocResp and ReassocResp have identical structure, so process both
3077          * of them in this function.
3078          */
3079
3080         if (len < 24 + 6)
3081                 return;
3082
3083         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3084         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3085         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3086         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3087
3088         sdata_info(sdata,
3089                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3090                    reassoc ? "Rea" : "A", mgmt->sa,
3091                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3092
3093         pos = mgmt->u.assoc_resp.variable;
3094         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3095
3096         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3097             elems.timeout_int &&
3098             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3099                 u32 tu, ms;
3100                 tu = le32_to_cpu(elems.timeout_int->value);
3101                 ms = tu * 1024 / 1000;
3102                 sdata_info(sdata,
3103                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3104                            mgmt->sa, tu, ms);
3105                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3106                 assoc_data->timeout_started = true;
3107                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3108                         run_again(sdata, assoc_data->timeout);
3109                 return;
3110         }
3111
3112         bss = assoc_data->bss;
3113
3114         if (status_code != WLAN_STATUS_SUCCESS) {
3115                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3116                            mgmt->sa, status_code);
3117                 ieee80211_destroy_assoc_data(sdata, false);
3118                 event.u.mlme.status = MLME_DENIED;
3119                 event.u.mlme.reason = status_code;
3120                 drv_event_callback(sdata->local, sdata, &event);
3121         } else {
3122                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3123                         /* oops -- internal error -- send timeout for now */
3124                         ieee80211_destroy_assoc_data(sdata, false);
3125                         cfg80211_assoc_timeout(sdata->dev, bss);
3126                         return;
3127                 }
3128                 event.u.mlme.status = MLME_SUCCESS;
3129                 drv_event_callback(sdata->local, sdata, &event);
3130                 sdata_info(sdata, "associated\n");
3131
3132                 /*
3133                  * destroy assoc_data afterwards, as otherwise an idle
3134                  * recalc after assoc_data is NULL but before associated
3135                  * is set can cause the interface to go idle
3136                  */
3137                 ieee80211_destroy_assoc_data(sdata, true);
3138
3139                 /* get uapsd queues configuration */
3140                 uapsd_queues = 0;
3141                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3142                         if (sdata->tx_conf[ac].uapsd)
3143                                 uapsd_queues |= BIT(ac);
3144         }
3145
3146         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3147 }
3148
3149 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3150                                   struct ieee80211_mgmt *mgmt, size_t len,
3151                                   struct ieee80211_rx_status *rx_status,
3152                                   struct ieee802_11_elems *elems)
3153 {
3154         struct ieee80211_local *local = sdata->local;
3155         struct ieee80211_bss *bss;
3156         struct ieee80211_channel *channel;
3157
3158         sdata_assert_lock(sdata);
3159
3160         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3161         if (!channel)
3162                 return;
3163
3164         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3165                                         channel);
3166         if (bss) {
3167                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3168                 ieee80211_rx_bss_put(local, bss);
3169         }
3170 }
3171
3172
3173 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3174                                          struct sk_buff *skb)
3175 {
3176         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3177         struct ieee80211_if_managed *ifmgd;
3178         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3179         size_t baselen, len = skb->len;
3180         struct ieee802_11_elems elems;
3181
3182         ifmgd = &sdata->u.mgd;
3183
3184         sdata_assert_lock(sdata);
3185
3186         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3187                 return; /* ignore ProbeResp to foreign address */
3188
3189         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3190         if (baselen > len)
3191                 return;
3192
3193         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3194                                false, &elems);
3195
3196         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3197
3198         if (ifmgd->associated &&
3199             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3200                 ieee80211_reset_ap_probe(sdata);
3201
3202         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3203             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3204                 /* got probe response, continue with auth */
3205                 sdata_info(sdata, "direct probe responded\n");
3206                 ifmgd->auth_data->tries = 0;
3207                 ifmgd->auth_data->timeout = jiffies;
3208                 ifmgd->auth_data->timeout_started = true;
3209                 run_again(sdata, ifmgd->auth_data->timeout);
3210         }
3211 }
3212
3213 /*
3214  * This is the canonical list of information elements we care about,
3215  * the filter code also gives us all changes to the Microsoft OUI
3216  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3217  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3218  * changes to requested client power.
3219  *
3220  * We implement beacon filtering in software since that means we can
3221  * avoid processing the frame here and in cfg80211, and userspace
3222  * will not be able to tell whether the hardware supports it or not.
3223  *
3224  * XXX: This list needs to be dynamic -- userspace needs to be able to
3225  *      add items it requires. It also needs to be able to tell us to
3226  *      look out for other vendor IEs.
3227  */
3228 static const u64 care_about_ies =
3229         (1ULL << WLAN_EID_COUNTRY) |
3230         (1ULL << WLAN_EID_ERP_INFO) |
3231         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3232         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3233         (1ULL << WLAN_EID_HT_CAPABILITY) |
3234         (1ULL << WLAN_EID_HT_OPERATION);
3235
3236 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3237                                      struct ieee80211_mgmt *mgmt, size_t len,
3238                                      struct ieee80211_rx_status *rx_status)
3239 {
3240         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3241         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3242         size_t baselen;
3243         struct ieee802_11_elems elems;
3244         struct ieee80211_local *local = sdata->local;
3245         struct ieee80211_chanctx_conf *chanctx_conf;
3246         struct ieee80211_channel *chan;
3247         struct sta_info *sta;
3248         u32 changed = 0;
3249         bool erp_valid;
3250         u8 erp_value = 0;
3251         u32 ncrc;
3252         u8 *bssid;
3253         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3254
3255         sdata_assert_lock(sdata);
3256
3257         /* Process beacon from the current BSS */
3258         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3259         if (baselen > len)
3260                 return;
3261
3262         rcu_read_lock();
3263         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3264         if (!chanctx_conf) {
3265                 rcu_read_unlock();
3266                 return;
3267         }
3268
3269         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3270                 rcu_read_unlock();
3271                 return;
3272         }
3273         chan = chanctx_conf->def.chan;
3274         rcu_read_unlock();
3275
3276         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3277             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3278                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3279                                        len - baselen, false, &elems);
3280
3281                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3282                 if (elems.tim && !elems.parse_error) {
3283                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3284                         ifmgd->dtim_period = tim_ie->dtim_period;
3285                 }
3286                 ifmgd->have_beacon = true;
3287                 ifmgd->assoc_data->need_beacon = false;
3288                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3289                         sdata->vif.bss_conf.sync_tsf =
3290                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3291                         sdata->vif.bss_conf.sync_device_ts =
3292                                 rx_status->device_timestamp;
3293                         if (elems.tim)
3294                                 sdata->vif.bss_conf.sync_dtim_count =
3295                                         elems.tim->dtim_count;
3296                         else
3297                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3298                 }
3299                 /* continue assoc process */
3300                 ifmgd->assoc_data->timeout = jiffies;
3301                 ifmgd->assoc_data->timeout_started = true;
3302                 run_again(sdata, ifmgd->assoc_data->timeout);
3303                 return;
3304         }
3305
3306         if (!ifmgd->associated ||
3307             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3308                 return;
3309         bssid = ifmgd->associated->bssid;
3310
3311         /* Track average RSSI from the Beacon frames of the current AP */
3312         ifmgd->last_beacon_signal = rx_status->signal;
3313         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3314                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3315                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3316                 ifmgd->last_cqm_event_signal = 0;
3317                 ifmgd->count_beacon_signal = 1;
3318                 ifmgd->last_ave_beacon_signal = 0;
3319         } else {
3320                 ifmgd->ave_beacon_signal =
3321                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3322                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3323                          ifmgd->ave_beacon_signal) / 16;
3324                 ifmgd->count_beacon_signal++;
3325         }
3326
3327         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3328             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3329                 int sig = ifmgd->ave_beacon_signal;
3330                 int last_sig = ifmgd->last_ave_beacon_signal;
3331                 struct ieee80211_event event = {
3332                         .type = RSSI_EVENT,
3333                 };
3334
3335                 /*
3336                  * if signal crosses either of the boundaries, invoke callback
3337                  * with appropriate parameters
3338                  */
3339                 if (sig > ifmgd->rssi_max_thold &&
3340                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3341                         ifmgd->last_ave_beacon_signal = sig;
3342                         event.u.rssi.data = RSSI_EVENT_HIGH;
3343                         drv_event_callback(local, sdata, &event);
3344                 } else if (sig < ifmgd->rssi_min_thold &&
3345                            (last_sig >= ifmgd->rssi_max_thold ||
3346                            last_sig == 0)) {
3347                         ifmgd->last_ave_beacon_signal = sig;
3348                         event.u.rssi.data = RSSI_EVENT_LOW;
3349                         drv_event_callback(local, sdata, &event);
3350                 }
3351         }
3352
3353         if (bss_conf->cqm_rssi_thold &&
3354             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3355             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3356                 int sig = ifmgd->ave_beacon_signal / 16;
3357                 int last_event = ifmgd->last_cqm_event_signal;
3358                 int thold = bss_conf->cqm_rssi_thold;
3359                 int hyst = bss_conf->cqm_rssi_hyst;
3360                 if (sig < thold &&
3361                     (last_event == 0 || sig < last_event - hyst)) {
3362                         ifmgd->last_cqm_event_signal = sig;
3363                         ieee80211_cqm_rssi_notify(
3364                                 &sdata->vif,
3365                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3366                                 GFP_KERNEL);
3367                 } else if (sig > thold &&
3368                            (last_event == 0 || sig > last_event + hyst)) {
3369                         ifmgd->last_cqm_event_signal = sig;
3370                         ieee80211_cqm_rssi_notify(
3371                                 &sdata->vif,
3372                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3373                                 GFP_KERNEL);
3374                 }
3375         }
3376
3377         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3378                 mlme_dbg_ratelimited(sdata,
3379                                      "cancelling AP probe due to a received beacon\n");
3380                 ieee80211_reset_ap_probe(sdata);
3381         }
3382
3383         /*
3384          * Push the beacon loss detection into the future since
3385          * we are processing a beacon from the AP just now.
3386          */
3387         ieee80211_sta_reset_beacon_monitor(sdata);
3388
3389         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3390         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3391                                           len - baselen, false, &elems,
3392                                           care_about_ies, ncrc);
3393
3394         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3395                 bool directed_tim = ieee80211_check_tim(elems.tim,
3396                                                         elems.tim_len,
3397                                                         ifmgd->aid);
3398                 if (directed_tim) {
3399                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3400                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3401                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3402                                         ieee80211_hw_config(local,
3403                                                             IEEE80211_CONF_CHANGE_PS);
3404                                 }
3405                                 ieee80211_send_nullfunc(local, sdata, 0);
3406                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3407                                 local->pspolling = true;
3408
3409                                 /*
3410                                  * Here is assumed that the driver will be
3411                                  * able to send ps-poll frame and receive a
3412                                  * response even though power save mode is
3413                                  * enabled, but some drivers might require
3414                                  * to disable power save here. This needs
3415                                  * to be investigated.
3416                                  */
3417                                 ieee80211_send_pspoll(local, sdata);
3418                         }
3419                 }
3420         }
3421
3422         if (sdata->vif.p2p) {
3423                 struct ieee80211_p2p_noa_attr noa = {};
3424                 int ret;
3425
3426                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3427                                             len - baselen,
3428                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3429                                             (u8 *) &noa, sizeof(noa));
3430                 if (ret >= 2) {
3431                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3432                                 /* valid noa_attr and index changed */
3433                                 sdata->u.mgd.p2p_noa_index = noa.index;
3434                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3435                                 changed |= BSS_CHANGED_P2P_PS;
3436                                 /*
3437                                  * make sure we update all information, the CRC
3438                                  * mechanism doesn't look at P2P attributes.
3439                                  */
3440                                 ifmgd->beacon_crc_valid = false;
3441                         }
3442                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3443                         /* noa_attr not found and we had valid noa_attr before */
3444                         sdata->u.mgd.p2p_noa_index = -1;
3445                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3446                         changed |= BSS_CHANGED_P2P_PS;
3447                         ifmgd->beacon_crc_valid = false;
3448                 }
3449         }
3450
3451         if (ifmgd->csa_waiting_bcn)
3452                 ieee80211_chswitch_post_beacon(sdata);
3453
3454         /*
3455          * Update beacon timing and dtim count on every beacon appearance. This
3456          * will allow the driver to use the most updated values. Do it before
3457          * comparing this one with last received beacon.
3458          * IMPORTANT: These parameters would possibly be out of sync by the time
3459          * the driver will use them. The synchronized view is currently
3460          * guaranteed only in certain callbacks.
3461          */
3462         if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3463                 sdata->vif.bss_conf.sync_tsf =
3464                         le64_to_cpu(mgmt->u.beacon.timestamp);
3465                 sdata->vif.bss_conf.sync_device_ts =
3466                         rx_status->device_timestamp;
3467                 if (elems.tim)
3468                         sdata->vif.bss_conf.sync_dtim_count =
3469                                 elems.tim->dtim_count;
3470                 else
3471                         sdata->vif.bss_conf.sync_dtim_count = 0;
3472         }
3473
3474         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3475                 return;
3476         ifmgd->beacon_crc = ncrc;
3477         ifmgd->beacon_crc_valid = true;
3478
3479         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3480
3481         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3482                                          rx_status->device_timestamp,
3483                                          &elems, true);
3484
3485         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3486             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3487                                      elems.wmm_param_len))
3488                 changed |= BSS_CHANGED_QOS;
3489
3490         /*
3491          * If we haven't had a beacon before, tell the driver about the
3492          * DTIM period (and beacon timing if desired) now.
3493          */
3494         if (!ifmgd->have_beacon) {
3495                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3496                 if (elems.tim)
3497                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3498                 else
3499                         bss_conf->dtim_period = 1;
3500
3501                 changed |= BSS_CHANGED_BEACON_INFO;
3502                 ifmgd->have_beacon = true;
3503
3504                 mutex_lock(&local->iflist_mtx);
3505                 ieee80211_recalc_ps(local, -1);
3506                 mutex_unlock(&local->iflist_mtx);
3507
3508                 ieee80211_recalc_ps_vif(sdata);
3509         }
3510
3511         if (elems.erp_info) {
3512                 erp_valid = true;
3513                 erp_value = elems.erp_info[0];
3514         } else {
3515                 erp_valid = false;
3516         }
3517         changed |= ieee80211_handle_bss_capability(sdata,
3518                         le16_to_cpu(mgmt->u.beacon.capab_info),
3519                         erp_valid, erp_value);
3520
3521         mutex_lock(&local->sta_mtx);
3522         sta = sta_info_get(sdata, bssid);
3523
3524         if (ieee80211_config_bw(sdata, sta,
3525                                 elems.ht_cap_elem, elems.ht_operation,
3526                                 elems.vht_operation, bssid, &changed)) {
3527                 mutex_unlock(&local->sta_mtx);
3528                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3529                                        WLAN_REASON_DEAUTH_LEAVING,
3530                                        true, deauth_buf);
3531                 ieee80211_report_disconnect(sdata, deauth_buf,
3532                                             sizeof(deauth_buf), true,
3533                                             WLAN_REASON_DEAUTH_LEAVING);
3534                 return;
3535         }
3536
3537         if (sta && elems.opmode_notif)
3538                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3539                                             rx_status->band, true);
3540         mutex_unlock(&local->sta_mtx);
3541
3542         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3543                                                elems.country_elem,
3544                                                elems.country_elem_len,
3545                                                elems.pwr_constr_elem,
3546                                                elems.cisco_dtpc_elem);
3547
3548         ieee80211_bss_info_change_notify(sdata, changed);
3549 }
3550
3551 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3552                                   struct sk_buff *skb)
3553 {
3554         struct ieee80211_rx_status *rx_status;
3555         struct ieee80211_mgmt *mgmt;
3556         u16 fc;
3557         struct ieee802_11_elems elems;
3558         int ies_len;
3559
3560         rx_status = (struct ieee80211_rx_status *) skb->cb;
3561         mgmt = (struct ieee80211_mgmt *) skb->data;
3562         fc = le16_to_cpu(mgmt->frame_control);
3563
3564         sdata_lock(sdata);
3565
3566         switch (fc & IEEE80211_FCTL_STYPE) {
3567         case IEEE80211_STYPE_BEACON:
3568                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3569                 break;
3570         case IEEE80211_STYPE_PROBE_RESP:
3571                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3572                 break;
3573         case IEEE80211_STYPE_AUTH:
3574                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3575                 break;
3576         case IEEE80211_STYPE_DEAUTH:
3577                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3578                 break;
3579         case IEEE80211_STYPE_DISASSOC:
3580                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3581                 break;
3582         case IEEE80211_STYPE_ASSOC_RESP:
3583         case IEEE80211_STYPE_REASSOC_RESP:
3584                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3585                 break;
3586         case IEEE80211_STYPE_ACTION:
3587                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3588                         ies_len = skb->len -
3589                                   offsetof(struct ieee80211_mgmt,
3590                                            u.action.u.chan_switch.variable);
3591
3592                         if (ies_len < 0)
3593                                 break;
3594
3595                         ieee802_11_parse_elems(
3596                                 mgmt->u.action.u.chan_switch.variable,
3597                                 ies_len, true, &elems);
3598
3599                         if (elems.parse_error)
3600                                 break;
3601
3602                         ieee80211_sta_process_chanswitch(sdata,
3603                                                  rx_status->mactime,
3604                                                  rx_status->device_timestamp,
3605                                                  &elems, false);
3606                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3607                         ies_len = skb->len -
3608                                   offsetof(struct ieee80211_mgmt,
3609                                            u.action.u.ext_chan_switch.variable);
3610
3611                         if (ies_len < 0)
3612                                 break;
3613
3614                         ieee802_11_parse_elems(
3615                                 mgmt->u.action.u.ext_chan_switch.variable,
3616                                 ies_len, true, &elems);
3617
3618                         if (elems.parse_error)
3619                                 break;
3620
3621                         /* for the handling code pretend this was also an IE */
3622                         elems.ext_chansw_ie =
3623                                 &mgmt->u.action.u.ext_chan_switch.data;
3624
3625                         ieee80211_sta_process_chanswitch(sdata,
3626                                                  rx_status->mactime,
3627                                                  rx_status->device_timestamp,
3628                                                  &elems, false);
3629                 }
3630                 break;
3631         }
3632         sdata_unlock(sdata);
3633 }
3634
3635 static void ieee80211_sta_timer(unsigned long data)
3636 {
3637         struct ieee80211_sub_if_data *sdata =
3638                 (struct ieee80211_sub_if_data *) data;
3639
3640         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3641 }
3642
3643 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3644                                           u8 *bssid, u8 reason, bool tx)
3645 {
3646         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3647
3648         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3649                                tx, frame_buf);
3650
3651         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3652                                     reason);
3653 }
3654
3655 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3656 {
3657         struct ieee80211_local *local = sdata->local;
3658         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3659         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3660         u32 tx_flags = 0;
3661
3662         sdata_assert_lock(sdata);
3663
3664         if (WARN_ON_ONCE(!auth_data))
3665                 return -EINVAL;
3666
3667         auth_data->tries++;
3668
3669         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3670                 sdata_info(sdata, "authentication with %pM timed out\n",
3671                            auth_data->bss->bssid);
3672
3673                 /*
3674                  * Most likely AP is not in the range so remove the
3675                  * bss struct for that AP.
3676                  */
3677                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3678
3679                 return -ETIMEDOUT;
3680         }
3681
3682         drv_mgd_prepare_tx(local, sdata);
3683
3684         if (auth_data->bss->proberesp_ies) {
3685                 u16 trans = 1;
3686                 u16 status = 0;
3687
3688                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3689                            auth_data->bss->bssid, auth_data->tries,
3690                            IEEE80211_AUTH_MAX_TRIES);
3691
3692                 auth_data->expected_transaction = 2;
3693
3694                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3695                         trans = auth_data->sae_trans;
3696                         status = auth_data->sae_status;
3697                         auth_data->expected_transaction = trans;
3698                 }
3699
3700                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3701                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3702                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3703
3704                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3705                                     auth_data->data, auth_data->data_len,
3706                                     auth_data->bss->bssid,
3707                                     auth_data->bss->bssid, NULL, 0, 0,
3708                                     tx_flags);
3709         } else {
3710                 const u8 *ssidie;
3711
3712                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3713                            auth_data->bss->bssid, auth_data->tries,
3714                            IEEE80211_AUTH_MAX_TRIES);
3715
3716                 rcu_read_lock();
3717                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3718                 if (!ssidie) {
3719                         rcu_read_unlock();
3720                         return -EINVAL;
3721                 }
3722                 /*
3723                  * Direct probe is sent to broadcast address as some APs
3724                  * will not answer to direct packet in unassociated state.
3725                  */
3726                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
3727                                          ssidie + 2, ssidie[1],
3728                                          NULL, 0, (u32) -1, true, 0,
3729                                          auth_data->bss->channel, false);
3730                 rcu_read_unlock();
3731         }
3732
3733         if (tx_flags == 0) {
3734                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3735                 auth_data->timeout_started = true;
3736                 run_again(sdata, auth_data->timeout);
3737         } else {
3738                 auth_data->timeout =
3739                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3740                 auth_data->timeout_started = true;
3741                 run_again(sdata, auth_data->timeout);
3742         }
3743
3744         return 0;
3745 }
3746
3747 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3748 {
3749         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3750         struct ieee80211_local *local = sdata->local;
3751
3752         sdata_assert_lock(sdata);
3753
3754         assoc_data->tries++;
3755         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3756                 sdata_info(sdata, "association with %pM timed out\n",
3757                            assoc_data->bss->bssid);
3758
3759                 /*
3760                  * Most likely AP is not in the range so remove the
3761                  * bss struct for that AP.
3762                  */
3763                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3764
3765                 return -ETIMEDOUT;
3766         }
3767
3768         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3769                    assoc_data->bss->bssid, assoc_data->tries,
3770                    IEEE80211_ASSOC_MAX_TRIES);
3771         ieee80211_send_assoc(sdata);
3772
3773         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3774                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3775                 assoc_data->timeout_started = true;
3776                 run_again(sdata, assoc_data->timeout);
3777         } else {
3778                 assoc_data->timeout =
3779                         round_jiffies_up(jiffies +
3780                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3781                 assoc_data->timeout_started = true;
3782                 run_again(sdata, assoc_data->timeout);
3783         }
3784
3785         return 0;
3786 }
3787
3788 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3789                                   __le16 fc, bool acked)
3790 {
3791         struct ieee80211_local *local = sdata->local;
3792
3793         sdata->u.mgd.status_fc = fc;
3794         sdata->u.mgd.status_acked = acked;
3795         sdata->u.mgd.status_received = true;
3796
3797         ieee80211_queue_work(&local->hw, &sdata->work);
3798 }
3799
3800 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3801 {
3802         struct ieee80211_local *local = sdata->local;
3803         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3804
3805         sdata_lock(sdata);
3806
3807         if (ifmgd->status_received) {
3808                 __le16 fc = ifmgd->status_fc;
3809                 bool status_acked = ifmgd->status_acked;
3810
3811                 ifmgd->status_received = false;
3812                 if (ifmgd->auth_data &&
3813                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3814                         if (status_acked) {
3815                                 ifmgd->auth_data->timeout =
3816                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3817                                 run_again(sdata, ifmgd->auth_data->timeout);
3818                         } else {
3819                                 ifmgd->auth_data->timeout = jiffies - 1;
3820                         }
3821                         ifmgd->auth_data->timeout_started = true;
3822                 } else if (ifmgd->assoc_data &&
3823                            (ieee80211_is_assoc_req(fc) ||
3824                             ieee80211_is_reassoc_req(fc))) {
3825                         if (status_acked) {
3826                                 ifmgd->assoc_data->timeout =
3827                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3828                                 run_again(sdata, ifmgd->assoc_data->timeout);
3829                         } else {
3830                                 ifmgd->assoc_data->timeout = jiffies - 1;
3831                         }
3832                         ifmgd->assoc_data->timeout_started = true;
3833                 }
3834         }
3835
3836         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3837             time_after(jiffies, ifmgd->auth_data->timeout)) {
3838                 if (ifmgd->auth_data->done) {
3839                         /*
3840                          * ok ... we waited for assoc but userspace didn't,
3841                          * so let's just kill the auth data
3842                          */
3843                         ieee80211_destroy_auth_data(sdata, false);
3844                 } else if (ieee80211_probe_auth(sdata)) {
3845                         u8 bssid[ETH_ALEN];
3846                         struct ieee80211_event event = {
3847                                 .type = MLME_EVENT,
3848                                 .u.mlme.data = AUTH_EVENT,
3849                                 .u.mlme.status = MLME_TIMEOUT,
3850                         };
3851
3852                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3853
3854                         ieee80211_destroy_auth_data(sdata, false);
3855
3856                         cfg80211_auth_timeout(sdata->dev, bssid);
3857                         drv_event_callback(sdata->local, sdata, &event);
3858                 }
3859         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3860                 run_again(sdata, ifmgd->auth_data->timeout);
3861
3862         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3863             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3864                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3865                     ieee80211_do_assoc(sdata)) {
3866                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3867                         struct ieee80211_event event = {
3868                                 .type = MLME_EVENT,
3869                                 .u.mlme.data = ASSOC_EVENT,
3870                                 .u.mlme.status = MLME_TIMEOUT,
3871                         };
3872
3873                         ieee80211_destroy_assoc_data(sdata, false);
3874                         cfg80211_assoc_timeout(sdata->dev, bss);
3875                         drv_event_callback(sdata->local, sdata, &event);
3876                 }
3877         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3878                 run_again(sdata, ifmgd->assoc_data->timeout);
3879
3880         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3881             ifmgd->associated) {
3882                 u8 bssid[ETH_ALEN];
3883                 int max_tries;
3884
3885                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3886
3887                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3888                         max_tries = max_nullfunc_tries;
3889                 else
3890                         max_tries = max_probe_tries;
3891
3892                 /* ACK received for nullfunc probing frame */
3893                 if (!ifmgd->probe_send_count)
3894                         ieee80211_reset_ap_probe(sdata);
3895                 else if (ifmgd->nullfunc_failed) {
3896                         if (ifmgd->probe_send_count < max_tries) {
3897                                 mlme_dbg(sdata,
3898                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3899                                          bssid, ifmgd->probe_send_count,
3900                                          max_tries);
3901                                 ieee80211_mgd_probe_ap_send(sdata);
3902                         } else {
3903                                 mlme_dbg(sdata,
3904                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3905                                          bssid);
3906                                 ieee80211_sta_connection_lost(sdata, bssid,
3907                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3908                                         false);
3909                         }
3910                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3911                         run_again(sdata, ifmgd->probe_timeout);
3912                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3913                         mlme_dbg(sdata,
3914                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3915                                  bssid, probe_wait_ms);
3916                         ieee80211_sta_connection_lost(sdata, bssid,
3917                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3918                 } else if (ifmgd->probe_send_count < max_tries) {
3919                         mlme_dbg(sdata,
3920                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3921                                  bssid, probe_wait_ms,
3922                                  ifmgd->probe_send_count, max_tries);
3923                         ieee80211_mgd_probe_ap_send(sdata);
3924                 } else {
3925                         /*
3926                          * We actually lost the connection ... or did we?
3927                          * Let's make sure!
3928                          */
3929                         wiphy_debug(local->hw.wiphy,
3930                                     "%s: No probe response from AP %pM"
3931                                     " after %dms, disconnecting.\n",
3932                                     sdata->name,
3933                                     bssid, probe_wait_ms);
3934
3935                         ieee80211_sta_connection_lost(sdata, bssid,
3936                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3937                 }
3938         }
3939
3940         sdata_unlock(sdata);
3941 }
3942
3943 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3944 {
3945         struct ieee80211_sub_if_data *sdata =
3946                 (struct ieee80211_sub_if_data *) data;
3947         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3948
3949         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3950                 return;
3951
3952         sdata->u.mgd.connection_loss = false;
3953         ieee80211_queue_work(&sdata->local->hw,
3954                              &sdata->u.mgd.beacon_connection_loss_work);
3955 }
3956
3957 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3958 {
3959         struct ieee80211_sub_if_data *sdata =
3960                 (struct ieee80211_sub_if_data *) data;
3961         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3962         struct ieee80211_local *local = sdata->local;
3963
3964         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3965                 return;
3966
3967         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3968 }
3969
3970 static void ieee80211_sta_monitor_work(struct work_struct *work)
3971 {
3972         struct ieee80211_sub_if_data *sdata =
3973                 container_of(work, struct ieee80211_sub_if_data,
3974                              u.mgd.monitor_work);
3975
3976         ieee80211_mgd_probe_ap(sdata, false);
3977 }
3978
3979 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3980 {
3981         u32 flags;
3982
3983         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3984                 __ieee80211_stop_poll(sdata);
3985
3986                 /* let's probe the connection once */
3987                 flags = sdata->local->hw.flags;
3988                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3989                         ieee80211_queue_work(&sdata->local->hw,
3990                                              &sdata->u.mgd.monitor_work);
3991                 /* and do all the other regular work too */
3992                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3993         }
3994 }
3995
3996 #ifdef CONFIG_PM
3997 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3998 {
3999         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4000         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4001
4002         sdata_lock(sdata);
4003
4004         if (ifmgd->auth_data || ifmgd->assoc_data) {
4005                 const u8 *bssid = ifmgd->auth_data ?
4006                                 ifmgd->auth_data->bss->bssid :
4007                                 ifmgd->assoc_data->bss->bssid;
4008
4009                 /*
4010                  * If we are trying to authenticate / associate while suspending,
4011                  * cfg80211 won't know and won't actually abort those attempts,
4012                  * thus we need to do that ourselves.
4013                  */
4014                 ieee80211_send_deauth_disassoc(sdata, bssid,
4015                                                IEEE80211_STYPE_DEAUTH,
4016                                                WLAN_REASON_DEAUTH_LEAVING,
4017                                                false, frame_buf);
4018                 if (ifmgd->assoc_data)
4019                         ieee80211_destroy_assoc_data(sdata, false);
4020                 if (ifmgd->auth_data)
4021                         ieee80211_destroy_auth_data(sdata, false);
4022                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4023                                       IEEE80211_DEAUTH_FRAME_LEN);
4024         }
4025
4026         /* This is a bit of a hack - we should find a better and more generic
4027          * solution to this. Normally when suspending, cfg80211 will in fact
4028          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4029          * auth (not so important) or assoc (this is the problem) process.
4030          *
4031          * As a consequence, it can happen that we are in the process of both
4032          * associating and suspending, and receive an association response
4033          * after cfg80211 has checked if it needs to disconnect, but before
4034          * we actually set the flag to drop incoming frames. This will then
4035          * cause the workqueue flush to process the association response in
4036          * the suspend, resulting in a successful association just before it
4037          * tries to remove the interface from the driver, which now though
4038          * has a channel context assigned ... this results in issues.
4039          *
4040          * To work around this (for now) simply deauth here again if we're
4041          * now connected.
4042          */
4043         if (ifmgd->associated && !sdata->local->wowlan) {
4044                 u8 bssid[ETH_ALEN];
4045                 struct cfg80211_deauth_request req = {
4046                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4047                         .bssid = bssid,
4048                 };
4049
4050                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4051                 ieee80211_mgd_deauth(sdata, &req);
4052         }
4053
4054         sdata_unlock(sdata);
4055 }
4056
4057 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4058 {
4059         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4060
4061         sdata_lock(sdata);
4062         if (!ifmgd->associated) {
4063                 sdata_unlock(sdata);
4064                 return;
4065         }
4066
4067         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4068                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4069                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4070                 ieee80211_sta_connection_lost(sdata,
4071                                               ifmgd->associated->bssid,
4072                                               WLAN_REASON_UNSPECIFIED,
4073                                               true);
4074                 sdata_unlock(sdata);
4075                 return;
4076         }
4077         sdata_unlock(sdata);
4078 }
4079 #endif
4080
4081 /* interface setup */
4082 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4083 {
4084         struct ieee80211_if_managed *ifmgd;
4085
4086         ifmgd = &sdata->u.mgd;
4087         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4088         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4089         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4090                   ieee80211_beacon_connection_loss_work);
4091         INIT_WORK(&ifmgd->csa_connection_drop_work,
4092                   ieee80211_csa_connection_drop_work);
4093         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4094         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4095                           ieee80211_tdls_peer_del_work);
4096         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4097                     (unsigned long) sdata);
4098         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4099                     (unsigned long) sdata);
4100         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4101                     (unsigned long) sdata);
4102         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4103                     (unsigned long) sdata);
4104         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4105                           ieee80211_sta_handle_tspec_ac_params_wk);
4106
4107         ifmgd->flags = 0;
4108         ifmgd->powersave = sdata->wdev.ps;
4109         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4110         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4111         ifmgd->p2p_noa_index = -1;
4112
4113         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4114                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4115         else
4116                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4117
4118         /* Setup TDLS data */
4119         spin_lock_init(&ifmgd->teardown_lock);
4120         ifmgd->teardown_skb = NULL;
4121         ifmgd->orig_teardown_skb = NULL;
4122 }
4123
4124 /* scan finished notification */
4125 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4126 {
4127         struct ieee80211_sub_if_data *sdata;
4128
4129         /* Restart STA timers */
4130         rcu_read_lock();
4131         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4132                 if (ieee80211_sdata_running(sdata))
4133                         ieee80211_restart_sta_timer(sdata);
4134         }
4135         rcu_read_unlock();
4136 }
4137
4138 int ieee80211_max_network_latency(struct notifier_block *nb,
4139                                   unsigned long data, void *dummy)
4140 {
4141         s32 latency_usec = (s32) data;
4142         struct ieee80211_local *local =
4143                 container_of(nb, struct ieee80211_local,
4144                              network_latency_notifier);
4145
4146         mutex_lock(&local->iflist_mtx);
4147         ieee80211_recalc_ps(local, latency_usec);
4148         mutex_unlock(&local->iflist_mtx);
4149
4150         return NOTIFY_OK;
4151 }
4152
4153 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4154                                      struct cfg80211_bss *cbss)
4155 {
4156         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4157         const u8 *ht_cap_ie, *vht_cap_ie;
4158         const struct ieee80211_ht_cap *ht_cap;
4159         const struct ieee80211_vht_cap *vht_cap;
4160         u8 chains = 1;
4161
4162         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4163                 return chains;
4164
4165         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4166         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4167                 ht_cap = (void *)(ht_cap_ie + 2);
4168                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4169                 /*
4170                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4171                  *       "Tx Unequal Modulation Supported" fields.
4172                  */
4173         }
4174
4175         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4176                 return chains;
4177
4178         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4179         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4180                 u8 nss;
4181                 u16 tx_mcs_map;
4182
4183                 vht_cap = (void *)(vht_cap_ie + 2);
4184                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4185                 for (nss = 8; nss > 0; nss--) {
4186                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4187                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4188                                 break;
4189                 }
4190                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4191                 chains = max(chains, nss);
4192         }
4193
4194         return chains;
4195 }
4196
4197 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4198                                   struct cfg80211_bss *cbss)
4199 {
4200         struct ieee80211_local *local = sdata->local;
4201         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4202         const struct ieee80211_ht_cap *ht_cap = NULL;
4203         const struct ieee80211_ht_operation *ht_oper = NULL;
4204         const struct ieee80211_vht_operation *vht_oper = NULL;
4205         struct ieee80211_supported_band *sband;
4206         struct cfg80211_chan_def chandef;
4207         int ret;
4208
4209         sband = local->hw.wiphy->bands[cbss->channel->band];
4210
4211         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4212                           IEEE80211_STA_DISABLE_80P80MHZ |
4213                           IEEE80211_STA_DISABLE_160MHZ);
4214
4215         rcu_read_lock();
4216
4217         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4218             sband->ht_cap.ht_supported) {
4219                 const u8 *ht_oper_ie, *ht_cap_ie;
4220
4221                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4222                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4223                         ht_oper = (void *)(ht_oper_ie + 2);
4224
4225                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4226                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4227                         ht_cap = (void *)(ht_cap_ie + 2);
4228
4229                 if (!ht_cap) {
4230                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4231                         ht_oper = NULL;
4232                 }
4233         }
4234
4235         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4236             sband->vht_cap.vht_supported) {
4237                 const u8 *vht_oper_ie, *vht_cap;
4238
4239                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4240                                                    WLAN_EID_VHT_OPERATION);
4241                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4242                         vht_oper = (void *)(vht_oper_ie + 2);
4243                 if (vht_oper && !ht_oper) {
4244                         vht_oper = NULL;
4245                         sdata_info(sdata,
4246                                    "AP advertised VHT without HT, disabling both\n");
4247                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4248                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4249                 }
4250
4251                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4252                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4253                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4254                         vht_oper = NULL;
4255                 }
4256         }
4257
4258         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4259                                                      cbss->channel,
4260                                                      ht_cap, ht_oper, vht_oper,
4261                                                      &chandef, false);
4262
4263         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4264                                       local->rx_chains);
4265
4266         rcu_read_unlock();
4267
4268         /* will change later if needed */
4269         sdata->smps_mode = IEEE80211_SMPS_OFF;
4270
4271         mutex_lock(&local->mtx);
4272         /*
4273          * If this fails (possibly due to channel context sharing
4274          * on incompatible channels, e.g. 80+80 and 160 sharing the
4275          * same control channel) try to use a smaller bandwidth.
4276          */
4277         ret = ieee80211_vif_use_channel(sdata, &chandef,
4278                                         IEEE80211_CHANCTX_SHARED);
4279
4280         /* don't downgrade for 5 and 10 MHz channels, though. */
4281         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4282             chandef.width == NL80211_CHAN_WIDTH_10)
4283                 goto out;
4284
4285         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4286                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4287                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4288                                                 IEEE80211_CHANCTX_SHARED);
4289         }
4290  out:
4291         mutex_unlock(&local->mtx);
4292         return ret;
4293 }
4294
4295 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4296                                      struct cfg80211_bss *cbss, bool assoc)
4297 {
4298         struct ieee80211_local *local = sdata->local;
4299         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4300         struct ieee80211_bss *bss = (void *)cbss->priv;
4301         struct sta_info *new_sta = NULL;
4302         struct ieee80211_supported_band *sband;
4303         struct ieee80211_sta_ht_cap sta_ht_cap;
4304         bool have_sta = false, is_override = false;
4305         int err;
4306
4307         sband = local->hw.wiphy->bands[cbss->channel->band];
4308
4309         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4310                 return -EINVAL;
4311
4312         if (assoc) {
4313                 rcu_read_lock();
4314                 have_sta = sta_info_get(sdata, cbss->bssid);
4315                 rcu_read_unlock();
4316         }
4317
4318         if (!have_sta) {
4319                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4320                 if (!new_sta)
4321                         return -ENOMEM;
4322         }
4323
4324         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4325         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4326
4327         is_override = (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) !=
4328                       (sband->ht_cap.cap &
4329                        IEEE80211_HT_CAP_SUP_WIDTH_20_40);
4330
4331         if (new_sta || is_override) {
4332                 err = ieee80211_prep_channel(sdata, cbss);
4333                 if (err) {
4334                         if (new_sta)
4335                                 sta_info_free(local, new_sta);
4336                         return -EINVAL;
4337                 }
4338         }
4339
4340         if (new_sta) {
4341                 u32 rates = 0, basic_rates = 0;
4342                 bool have_higher_than_11mbit;
4343                 int min_rate = INT_MAX, min_rate_index = -1;
4344                 struct ieee80211_chanctx_conf *chanctx_conf;
4345                 const struct cfg80211_bss_ies *ies;
4346                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4347                 u32 rate_flags;
4348
4349                 rcu_read_lock();
4350                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4351                 if (WARN_ON(!chanctx_conf)) {
4352                         rcu_read_unlock();
4353                         sta_info_free(local, new_sta);
4354                         return -EINVAL;
4355                 }
4356                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4357                 rcu_read_unlock();
4358
4359                 ieee80211_get_rates(sband, bss->supp_rates,
4360                                     bss->supp_rates_len,
4361                                     &rates, &basic_rates,
4362                                     &have_higher_than_11mbit,
4363                                     &min_rate, &min_rate_index,
4364                                     shift, rate_flags);
4365
4366                 /*
4367                  * This used to be a workaround for basic rates missing
4368                  * in the association response frame. Now that we no
4369                  * longer use the basic rates from there, it probably
4370                  * doesn't happen any more, but keep the workaround so
4371                  * in case some *other* APs are buggy in different ways
4372                  * we can connect -- with a warning.
4373                  */
4374                 if (!basic_rates && min_rate_index >= 0) {
4375                         sdata_info(sdata,
4376                                    "No basic rates, using min rate instead\n");
4377                         basic_rates = BIT(min_rate_index);
4378                 }
4379
4380                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4381                 sdata->vif.bss_conf.basic_rates = basic_rates;
4382
4383                 /* cf. IEEE 802.11 9.2.12 */
4384                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4385                     have_higher_than_11mbit)
4386                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4387                 else
4388                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4389
4390                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4391
4392                 /* set timing information */
4393                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4394                 rcu_read_lock();
4395                 ies = rcu_dereference(cbss->beacon_ies);
4396                 if (ies) {
4397                         const u8 *tim_ie;
4398
4399                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4400                         sdata->vif.bss_conf.sync_device_ts =
4401                                 bss->device_ts_beacon;
4402                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4403                                                   ies->data, ies->len);
4404                         if (tim_ie && tim_ie[1] >= 2)
4405                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4406                         else
4407                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4408                 } else if (!(local->hw.flags &
4409                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4410                         ies = rcu_dereference(cbss->proberesp_ies);
4411                         /* must be non-NULL since beacon IEs were NULL */
4412                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4413                         sdata->vif.bss_conf.sync_device_ts =
4414                                 bss->device_ts_presp;
4415                         sdata->vif.bss_conf.sync_dtim_count = 0;
4416                 } else {
4417                         sdata->vif.bss_conf.sync_tsf = 0;
4418                         sdata->vif.bss_conf.sync_device_ts = 0;
4419                         sdata->vif.bss_conf.sync_dtim_count = 0;
4420                 }
4421                 rcu_read_unlock();
4422
4423                 /* tell driver about BSSID, basic rates and timing */
4424                 ieee80211_bss_info_change_notify(sdata,
4425                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4426                         BSS_CHANGED_BEACON_INT);
4427
4428                 if (assoc)
4429                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4430
4431                 err = sta_info_insert(new_sta);
4432                 new_sta = NULL;
4433                 if (err) {
4434                         sdata_info(sdata,
4435                                    "failed to insert STA entry for the AP (error %d)\n",
4436                                    err);
4437                         return err;
4438                 }
4439         } else
4440                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4441
4442         /* Cancel scan to ensure that nothing interferes with connection */
4443         if (local->scanning)
4444                 ieee80211_scan_cancel(local);
4445
4446         return 0;
4447 }
4448
4449 /* config hooks */
4450 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4451                        struct cfg80211_auth_request *req)
4452 {
4453         struct ieee80211_local *local = sdata->local;
4454         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4455         struct ieee80211_mgd_auth_data *auth_data;
4456         u16 auth_alg;
4457         int err;
4458
4459         /* prepare auth data structure */
4460
4461         switch (req->auth_type) {
4462         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4463                 auth_alg = WLAN_AUTH_OPEN;
4464                 break;
4465         case NL80211_AUTHTYPE_SHARED_KEY:
4466                 if (IS_ERR(local->wep_tx_tfm))
4467                         return -EOPNOTSUPP;
4468                 auth_alg = WLAN_AUTH_SHARED_KEY;
4469                 break;
4470         case NL80211_AUTHTYPE_FT:
4471                 auth_alg = WLAN_AUTH_FT;
4472                 break;
4473         case NL80211_AUTHTYPE_NETWORK_EAP:
4474                 auth_alg = WLAN_AUTH_LEAP;
4475                 break;
4476         case NL80211_AUTHTYPE_SAE:
4477                 auth_alg = WLAN_AUTH_SAE;
4478                 break;
4479         default:
4480                 return -EOPNOTSUPP;
4481         }
4482
4483         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4484                             req->ie_len, GFP_KERNEL);
4485         if (!auth_data)
4486                 return -ENOMEM;
4487
4488         auth_data->bss = req->bss;
4489
4490         if (req->sae_data_len >= 4) {
4491                 __le16 *pos = (__le16 *) req->sae_data;
4492                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4493                 auth_data->sae_status = le16_to_cpu(pos[1]);
4494                 memcpy(auth_data->data, req->sae_data + 4,
4495                        req->sae_data_len - 4);
4496                 auth_data->data_len += req->sae_data_len - 4;
4497         }
4498
4499         if (req->ie && req->ie_len) {
4500                 memcpy(&auth_data->data[auth_data->data_len],
4501                        req->ie, req->ie_len);
4502                 auth_data->data_len += req->ie_len;
4503         }
4504
4505         if (req->key && req->key_len) {
4506                 auth_data->key_len = req->key_len;
4507                 auth_data->key_idx = req->key_idx;
4508                 memcpy(auth_data->key, req->key, req->key_len);
4509         }
4510
4511         auth_data->algorithm = auth_alg;
4512
4513         /* try to authenticate/probe */
4514
4515         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4516             ifmgd->assoc_data) {
4517                 err = -EBUSY;
4518                 goto err_free;
4519         }
4520
4521         if (ifmgd->auth_data)
4522                 ieee80211_destroy_auth_data(sdata, false);
4523
4524         /* prep auth_data so we don't go into idle on disassoc */
4525         ifmgd->auth_data = auth_data;
4526
4527         if (ifmgd->associated) {
4528                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4529
4530                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4531                                        WLAN_REASON_UNSPECIFIED,
4532                                        false, frame_buf);
4533
4534                 ieee80211_report_disconnect(sdata, frame_buf,
4535                                             sizeof(frame_buf), true,
4536                                             WLAN_REASON_UNSPECIFIED);
4537         }
4538
4539         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4540
4541         err = ieee80211_prep_connection(sdata, req->bss, false);
4542         if (err)
4543                 goto err_clear;
4544
4545         err = ieee80211_probe_auth(sdata);
4546         if (err) {
4547                 sta_info_destroy_addr(sdata, req->bss->bssid);
4548                 goto err_clear;
4549         }
4550
4551         /* hold our own reference */
4552         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4553         return 0;
4554
4555  err_clear:
4556         memset(ifmgd->bssid, 0, ETH_ALEN);
4557         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4558         ifmgd->auth_data = NULL;
4559  err_free:
4560         kfree(auth_data);
4561         return err;
4562 }
4563
4564 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4565                                         const u8 *wmm_param, int len)
4566 {
4567         const u8 *pos;
4568         size_t left;
4569
4570         if (len < 8)
4571                 return false;
4572
4573         if (wmm_param[5] != 1 /* version */)
4574                 return false;
4575
4576         pos = wmm_param + 8;
4577         left = len - 8;
4578
4579         for (; left >= 4; left -= 4, pos += 4) {
4580                 u8 aifsn = pos[0] & 0x0f;
4581                 u8 ecwmin = pos[1] & 0x0f;
4582                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4583                 int aci = (pos[0] >> 5) & 0x03;
4584
4585                 if (aifsn < 2) {
4586                         sdata_info(sdata,
4587                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4588                                    aifsn, aci);
4589                         return false;
4590                 }
4591                 if (ecwmin > ecwmax) {
4592                         sdata_info(sdata,
4593                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4594                                    ecwmin, ecwmax, aci);
4595                         return false;
4596                 }
4597         }
4598
4599         return true;
4600 }
4601
4602 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4603                         struct cfg80211_assoc_request *req)
4604 {
4605         struct ieee80211_local *local = sdata->local;
4606         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4607         struct ieee80211_bss *bss = (void *)req->bss->priv;
4608         struct ieee80211_mgd_assoc_data *assoc_data;
4609         const struct cfg80211_bss_ies *beacon_ies;
4610         struct ieee80211_supported_band *sband;
4611         const u8 *ssidie, *ht_ie, *vht_ie;
4612         int i, err;
4613
4614         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4615         if (!assoc_data)
4616                 return -ENOMEM;
4617
4618         rcu_read_lock();
4619         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4620         if (!ssidie) {
4621                 rcu_read_unlock();
4622                 kfree(assoc_data);
4623                 return -EINVAL;
4624         }
4625         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4626         assoc_data->ssid_len = ssidie[1];
4627         rcu_read_unlock();
4628
4629         if (ifmgd->associated) {
4630                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4631
4632                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4633                                        WLAN_REASON_UNSPECIFIED,
4634                                        false, frame_buf);
4635
4636                 ieee80211_report_disconnect(sdata, frame_buf,
4637                                             sizeof(frame_buf), true,
4638                                             WLAN_REASON_UNSPECIFIED);
4639         }
4640
4641         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4642                 err = -EBUSY;
4643                 goto err_free;
4644         }
4645
4646         if (ifmgd->assoc_data) {
4647                 err = -EBUSY;
4648                 goto err_free;
4649         }
4650
4651         if (ifmgd->auth_data) {
4652                 bool match;
4653
4654                 /* keep sta info, bssid if matching */
4655                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4656                 ieee80211_destroy_auth_data(sdata, match);
4657         }
4658
4659         /* prepare assoc data */
4660
4661         ifmgd->beacon_crc_valid = false;
4662
4663         assoc_data->wmm = bss->wmm_used &&
4664                           (local->hw.queues >= IEEE80211_NUM_ACS);
4665         if (assoc_data->wmm) {
4666                 /* try to check validity of WMM params IE */
4667                 const struct cfg80211_bss_ies *ies;
4668                 const u8 *wp, *start, *end;
4669
4670                 rcu_read_lock();
4671                 ies = rcu_dereference(req->bss->ies);
4672                 start = ies->data;
4673                 end = start + ies->len;
4674
4675                 while (true) {
4676                         wp = cfg80211_find_vendor_ie(
4677                                 WLAN_OUI_MICROSOFT,
4678                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4679                                 start, end - start);
4680                         if (!wp)
4681                                 break;
4682                         start = wp + wp[1] + 2;
4683                         /* if this IE is too short, try the next */
4684                         if (wp[1] <= 4)
4685                                 continue;
4686                         /* if this IE is WMM params, we found what we wanted */
4687                         if (wp[6] == 1)
4688                                 break;
4689                 }
4690
4691                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4692                                                         wp[1] - 2)) {
4693                         assoc_data->wmm = false;
4694                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4695                 }
4696                 rcu_read_unlock();
4697         }
4698
4699         /*
4700          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4701          * We still associate in non-HT mode (11a/b/g) if any one of these
4702          * ciphers is configured as pairwise.
4703          * We can set this to true for non-11n hardware, that'll be checked
4704          * separately along with the peer capabilities.
4705          */
4706         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4707                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4708                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4709                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4710                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4711                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4712                         netdev_info(sdata->dev,
4713                                     "disabling HT/VHT due to WEP/TKIP use\n");
4714                 }
4715         }
4716
4717         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4718                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4719                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4720         }
4721
4722         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4723                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4724
4725         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4726         sband = local->hw.wiphy->bands[req->bss->channel->band];
4727         if (!sband->ht_cap.ht_supported ||
4728             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4729             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4730                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4731                 if (!bss->wmm_used &&
4732                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4733                         netdev_info(sdata->dev,
4734                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4735         }
4736
4737         /* disable VHT if we don't support it or the AP doesn't use WMM */
4738         if (!sband->vht_cap.vht_supported ||
4739             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4740             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4741                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4742                 if (!bss->wmm_used &&
4743                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4744                         netdev_info(sdata->dev,
4745                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4746         }
4747
4748         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4749         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4750                sizeof(ifmgd->ht_capa_mask));
4751
4752         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4753         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4754                sizeof(ifmgd->vht_capa_mask));
4755
4756         if (req->ie && req->ie_len) {
4757                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4758                 assoc_data->ie_len = req->ie_len;
4759         }
4760
4761         assoc_data->bss = req->bss;
4762
4763         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4764                 if (ifmgd->powersave)
4765                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4766                 else
4767                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4768         } else
4769                 sdata->smps_mode = ifmgd->req_smps;
4770
4771         assoc_data->capability = req->bss->capability;
4772         assoc_data->supp_rates = bss->supp_rates;
4773         assoc_data->supp_rates_len = bss->supp_rates_len;
4774
4775         rcu_read_lock();
4776         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4777         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4778                 assoc_data->ap_ht_param =
4779                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4780         else
4781                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4782         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4783         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4784                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4785                        sizeof(struct ieee80211_vht_cap));
4786         else
4787                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4788         rcu_read_unlock();
4789
4790         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4791                  (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
4792              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4793                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4794
4795         if (bss->wmm_used && bss->uapsd_supported &&
4796             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4797                 assoc_data->uapsd = true;
4798                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4799         } else {
4800                 assoc_data->uapsd = false;
4801                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4802         }
4803
4804         if (req->prev_bssid)
4805                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4806
4807         if (req->use_mfp) {
4808                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4809                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4810         } else {
4811                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4812                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4813         }
4814
4815         if (req->flags & ASSOC_REQ_USE_RRM)
4816                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4817         else
4818                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4819
4820         if (req->crypto.control_port)
4821                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4822         else
4823                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4824
4825         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4826         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4827         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4828                                                         sdata->vif.type);
4829
4830         /* kick off associate process */
4831
4832         ifmgd->assoc_data = assoc_data;
4833         ifmgd->dtim_period = 0;
4834         ifmgd->have_beacon = false;
4835
4836         err = ieee80211_prep_connection(sdata, req->bss, true);
4837         if (err)
4838                 goto err_clear;
4839
4840         rcu_read_lock();
4841         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4842
4843         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4844             !beacon_ies) {
4845                 /*
4846                  * Wait up to one beacon interval ...
4847                  * should this be more if we miss one?
4848                  */
4849                 sdata_info(sdata, "waiting for beacon from %pM\n",
4850                            ifmgd->bssid);
4851                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4852                 assoc_data->timeout_started = true;
4853                 assoc_data->need_beacon = true;
4854         } else if (beacon_ies) {
4855                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4856                                                     beacon_ies->data,
4857                                                     beacon_ies->len);
4858                 u8 dtim_count = 0;
4859
4860                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4861                         const struct ieee80211_tim_ie *tim;
4862                         tim = (void *)(tim_ie + 2);
4863                         ifmgd->dtim_period = tim->dtim_period;
4864                         dtim_count = tim->dtim_count;
4865                 }
4866                 ifmgd->have_beacon = true;
4867                 assoc_data->timeout = jiffies;
4868                 assoc_data->timeout_started = true;
4869
4870                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4871                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4872                         sdata->vif.bss_conf.sync_device_ts =
4873                                 bss->device_ts_beacon;
4874                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4875                 }
4876         } else {
4877                 assoc_data->timeout = jiffies;
4878                 assoc_data->timeout_started = true;
4879         }
4880         rcu_read_unlock();
4881
4882         run_again(sdata, assoc_data->timeout);
4883
4884         if (bss->corrupt_data) {
4885                 char *corrupt_type = "data";
4886                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4887                         if (bss->corrupt_data &
4888                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4889                                 corrupt_type = "beacon and probe response";
4890                         else
4891                                 corrupt_type = "beacon";
4892                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4893                         corrupt_type = "probe response";
4894                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4895                            corrupt_type);
4896         }
4897
4898         return 0;
4899  err_clear:
4900         memset(ifmgd->bssid, 0, ETH_ALEN);
4901         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4902         ifmgd->assoc_data = NULL;
4903  err_free:
4904         kfree(assoc_data);
4905         return err;
4906 }
4907
4908 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4909                          struct cfg80211_deauth_request *req)
4910 {
4911         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4912         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4913         bool tx = !req->local_state_change;
4914
4915         if (ifmgd->auth_data &&
4916             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4917                 sdata_info(sdata,
4918                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4919                            req->bssid, req->reason_code,
4920                            ieee80211_get_reason_code_string(req->reason_code));
4921
4922                 drv_mgd_prepare_tx(sdata->local, sdata);
4923                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4924                                                IEEE80211_STYPE_DEAUTH,
4925                                                req->reason_code, tx,
4926                                                frame_buf);
4927                 ieee80211_destroy_auth_data(sdata, false);
4928                 ieee80211_report_disconnect(sdata, frame_buf,
4929                                             sizeof(frame_buf), true,
4930                                             req->reason_code);
4931
4932                 return 0;
4933         }
4934
4935         if (ifmgd->associated &&
4936             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4937                 sdata_info(sdata,
4938                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4939                            req->bssid, req->reason_code,
4940                            ieee80211_get_reason_code_string(req->reason_code));
4941
4942                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4943                                        req->reason_code, tx, frame_buf);
4944                 ieee80211_report_disconnect(sdata, frame_buf,
4945                                             sizeof(frame_buf), true,
4946                                             req->reason_code);
4947                 return 0;
4948         }
4949
4950         return -ENOTCONN;
4951 }
4952
4953 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4954                            struct cfg80211_disassoc_request *req)
4955 {
4956         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4957         u8 bssid[ETH_ALEN];
4958         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4959
4960         /*
4961          * cfg80211 should catch this ... but it's racy since
4962          * we can receive a disassoc frame, process it, hand it
4963          * to cfg80211 while that's in a locked section already
4964          * trying to tell us that the user wants to disconnect.
4965          */
4966         if (ifmgd->associated != req->bss)
4967                 return -ENOLINK;
4968
4969         sdata_info(sdata,
4970                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4971                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4972
4973         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4974         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4975                                req->reason_code, !req->local_state_change,
4976                                frame_buf);
4977
4978         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
4979                                     req->reason_code);
4980
4981         return 0;
4982 }
4983
4984 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4985 {
4986         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4987
4988         /*
4989          * Make sure some work items will not run after this,
4990          * they will not do anything but might not have been
4991          * cancelled when disconnecting.
4992          */
4993         cancel_work_sync(&ifmgd->monitor_work);
4994         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4995         cancel_work_sync(&ifmgd->request_smps_work);
4996         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4997         cancel_work_sync(&ifmgd->chswitch_work);
4998         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4999
5000         sdata_lock(sdata);
5001         if (ifmgd->assoc_data) {
5002                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5003                 ieee80211_destroy_assoc_data(sdata, false);
5004                 cfg80211_assoc_timeout(sdata->dev, bss);
5005         }
5006         if (ifmgd->auth_data)
5007                 ieee80211_destroy_auth_data(sdata, false);
5008         spin_lock_bh(&ifmgd->teardown_lock);
5009         if (ifmgd->teardown_skb) {
5010                 kfree_skb(ifmgd->teardown_skb);
5011                 ifmgd->teardown_skb = NULL;
5012                 ifmgd->orig_teardown_skb = NULL;
5013         }
5014         spin_unlock_bh(&ifmgd->teardown_lock);
5015         del_timer_sync(&ifmgd->timer);
5016         sdata_unlock(sdata);
5017 }
5018
5019 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5020                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5021                                gfp_t gfp)
5022 {
5023         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5024
5025         trace_api_cqm_rssi_notify(sdata, rssi_event);
5026
5027         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5028 }
5029 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5030
5031 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5032 {
5033         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5034
5035         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5036
5037         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5038 }
5039 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);