kernel/net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  *
  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         if (cfg80211_chandef_identical(&csa_ie.chandef,
1154                                        &sdata->vif.bss_conf.chandef)) {
1155                 if (ifmgd->csa_ignored_same_chan)
1156                         return;
1157                 sdata_info(sdata,
1158                            "AP %pM tries to chanswitch to same channel, ignore\n",
1159                            ifmgd->associated->bssid);
1160                 ifmgd->csa_ignored_same_chan = true;
1161                 return;
1162         }
1163
1164         mutex_lock(&local->mtx);
1165         mutex_lock(&local->chanctx_mtx);
1166         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1167                                          lockdep_is_held(&local->chanctx_mtx));
1168         if (!conf) {
1169                 sdata_info(sdata,
1170                            "no channel context assigned to vif?, disconnecting\n");
1171                 goto drop_connection;
1172         }
1173
1174         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1175
1176         if (local->use_chanctx &&
1177             !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1178                 sdata_info(sdata,
1179                            "driver doesn't support chan-switch with channel contexts\n");
1180                 goto drop_connection;
1181         }
1182
1183         ch_switch.timestamp = timestamp;
1184         ch_switch.device_timestamp = device_timestamp;
1185         ch_switch.block_tx = csa_ie.mode;
1186         ch_switch.chandef = csa_ie.chandef;
1187         ch_switch.count = csa_ie.count;
1188
1189         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1190                 sdata_info(sdata,
1191                            "preparing for channel switch failed, disconnecting\n");
1192                 goto drop_connection;
1193         }
1194
1195         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1196                                             chanctx->mode, false);
1197         if (res) {
1198                 sdata_info(sdata,
1199                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1200                            res);
1201                 goto drop_connection;
1202         }
1203         mutex_unlock(&local->chanctx_mtx);
1204
1205         sdata->vif.csa_active = true;
1206         sdata->csa_chandef = csa_ie.chandef;
1207         sdata->csa_block_tx = csa_ie.mode;
1208         ifmgd->csa_ignored_same_chan = false;
1209
1210         if (sdata->csa_block_tx)
1211                 ieee80211_stop_vif_queues(local, sdata,
1212                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1213         mutex_unlock(&local->mtx);
1214
1215         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1216                                           csa_ie.count);
1217
1218         if (local->ops->channel_switch) {
1219                 /* use driver's channel switch callback */
1220                 drv_channel_switch(local, sdata, &ch_switch);
1221                 return;
1222         }
1223
1224         /* channel switch handled in software */
1225         if (csa_ie.count <= 1)
1226                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1227         else
1228                 mod_timer(&ifmgd->chswitch_timer,
1229                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1230                                          cbss->beacon_interval));
1231         return;
1232  drop_connection:
1233         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1234         mutex_unlock(&local->chanctx_mtx);
1235         mutex_unlock(&local->mtx);
1236 }
1237
1238 static bool
1239 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1240                                  struct ieee80211_channel *channel,
1241                                  const u8 *country_ie, u8 country_ie_len,
1242                                  const u8 *pwr_constr_elem,
1243                                  int *chan_pwr, int *pwr_reduction)
1244 {
1245         struct ieee80211_country_ie_triplet *triplet;
1246         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1247         int i, chan_increment;
1248         bool have_chan_pwr = false;
1249
1250         /* Invalid IE */
1251         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1252                 return false;
1253
1254         triplet = (void *)(country_ie + 3);
1255         country_ie_len -= 3;
1256
1257         switch (channel->band) {
1258         default:
1259                 WARN_ON_ONCE(1);
1260                 /* fall through */
1261         case IEEE80211_BAND_2GHZ:
1262         case IEEE80211_BAND_60GHZ:
1263                 chan_increment = 1;
1264                 break;
1265         case IEEE80211_BAND_5GHZ:
1266                 chan_increment = 4;
1267                 break;
1268         }
1269
1270         /* find channel */
1271         while (country_ie_len >= 3) {
1272                 u8 first_channel = triplet->chans.first_channel;
1273
1274                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1275                         goto next;
1276
1277                 for (i = 0; i < triplet->chans.num_channels; i++) {
1278                         if (first_channel + i * chan_increment == chan) {
1279                                 have_chan_pwr = true;
1280                                 *chan_pwr = triplet->chans.max_power;
1281                                 break;
1282                         }
1283                 }
1284                 if (have_chan_pwr)
1285                         break;
1286
1287  next:
1288                 triplet++;
1289                 country_ie_len -= 3;
1290         }
1291
1292         if (have_chan_pwr && pwr_constr_elem)
1293                 *pwr_reduction = *pwr_constr_elem;
1294         else
1295                 *pwr_reduction = 0;
1296
1297         return have_chan_pwr;
1298 }
1299
1300 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1301                                       struct ieee80211_channel *channel,
1302                                       const u8 *cisco_dtpc_ie,
1303                                       int *pwr_level)
1304 {
1305         /* From practical testing, the first data byte of the DTPC element
1306          * seems to contain the requested dBm level, and the CLI on Cisco
1307          * APs clearly state the range is -127 to 127 dBm, which indicates
1308          * a signed byte, although it seemingly never actually goes negative.
1309          * The other byte seems to always be zero.
1310          */
1311         *pwr_level = (__s8)cisco_dtpc_ie[4];
1312 }
1313
1314 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1315                                        struct ieee80211_channel *channel,
1316                                        struct ieee80211_mgmt *mgmt,
1317                                        const u8 *country_ie, u8 country_ie_len,
1318                                        const u8 *pwr_constr_ie,
1319                                        const u8 *cisco_dtpc_ie)
1320 {
1321         bool has_80211h_pwr = false, has_cisco_pwr = false;
1322         int chan_pwr = 0, pwr_reduction_80211h = 0;
1323         int pwr_level_cisco, pwr_level_80211h;
1324         int new_ap_level;
1325         __le16 capab = mgmt->u.probe_resp.capab_info;
1326
1327         if (country_ie &&
1328             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1329              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1330                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1331                         sdata, channel, country_ie, country_ie_len,
1332                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1333                 pwr_level_80211h =
1334                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1335         }
1336
1337         if (cisco_dtpc_ie) {
1338                 ieee80211_find_cisco_dtpc(
1339                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1340                 has_cisco_pwr = true;
1341         }
1342
1343         if (!has_80211h_pwr && !has_cisco_pwr)
1344                 return 0;
1345
1346         /* If we have both 802.11h and Cisco DTPC, apply both limits
1347          * by picking the smallest of the two power levels advertised.
1348          */
1349         if (has_80211h_pwr &&
1350             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1351                 sdata_dbg(sdata,
1352                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1353                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1354                           sdata->u.mgd.bssid);
1355                 new_ap_level = pwr_level_80211h;
1356         } else {  /* has_cisco_pwr is always true here. */
1357                 sdata_dbg(sdata,
1358                           "Limiting TX power to %d dBm as advertised by %pM\n",
1359                           pwr_level_cisco, sdata->u.mgd.bssid);
1360                 new_ap_level = pwr_level_cisco;
1361         }
1362
1363         if (sdata->ap_power_level == new_ap_level)
1364                 return 0;
1365
1366         sdata->ap_power_level = new_ap_level;
1367         if (__ieee80211_recalc_txpower(sdata))
1368                 return BSS_CHANGED_TXPOWER;
1369         return 0;
1370 }
1371
1372 /* powersave */
1373 static void ieee80211_enable_ps(struct ieee80211_local *local,
1374                                 struct ieee80211_sub_if_data *sdata)
1375 {
1376         struct ieee80211_conf *conf = &local->hw.conf;
1377
1378         /*
1379          * If we are scanning right now then the parameters will
1380          * take effect when scan finishes.
1381          */
1382         if (local->scanning)
1383                 return;
1384
1385         if (conf->dynamic_ps_timeout > 0 &&
1386             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1387                 mod_timer(&local->dynamic_ps_timer, jiffies +
1388                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1389         } else {
1390                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1391                         ieee80211_send_nullfunc(local, sdata, 1);
1392
1393                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1394                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1395                         return;
1396
1397                 conf->flags |= IEEE80211_CONF_PS;
1398                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1399         }
1400 }
1401
1402 static void ieee80211_change_ps(struct ieee80211_local *local)
1403 {
1404         struct ieee80211_conf *conf = &local->hw.conf;
1405
1406         if (local->ps_sdata) {
1407                 ieee80211_enable_ps(local, local->ps_sdata);
1408         } else if (conf->flags & IEEE80211_CONF_PS) {
1409                 conf->flags &= ~IEEE80211_CONF_PS;
1410                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1411                 del_timer_sync(&local->dynamic_ps_timer);
1412                 cancel_work_sync(&local->dynamic_ps_enable_work);
1413         }
1414 }
1415
1416 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1417 {
1418         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1419         struct sta_info *sta = NULL;
1420         bool authorized = false;
1421
1422         if (!mgd->powersave)
1423                 return false;
1424
1425         if (mgd->broken_ap)
1426                 return false;
1427
1428         if (!mgd->associated)
1429                 return false;
1430
1431         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1432                 return false;
1433
1434         if (!mgd->have_beacon)
1435                 return false;
1436
1437         rcu_read_lock();
1438         sta = sta_info_get(sdata, mgd->bssid);
1439         if (sta)
1440                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1441         rcu_read_unlock();
1442
1443         return authorized;
1444 }
1445
1446 /* need to hold RTNL or interface lock */
1447 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1448 {
1449         struct ieee80211_sub_if_data *sdata, *found = NULL;
1450         int count = 0;
1451         int timeout;
1452
1453         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1454                 local->ps_sdata = NULL;
1455                 return;
1456         }
1457
1458         list_for_each_entry(sdata, &local->interfaces, list) {
1459                 if (!ieee80211_sdata_running(sdata))
1460                         continue;
1461                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1462                         /* If an AP vif is found, then disable PS
1463                          * by setting the count to zero thereby setting
1464                          * ps_sdata to NULL.
1465                          */
1466                         count = 0;
1467                         break;
1468                 }
1469                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1470                         continue;
1471                 found = sdata;
1472                 count++;
1473         }
1474
1475         if (count == 1 && ieee80211_powersave_allowed(found)) {
1476                 s32 beaconint_us;
1477
1478                 if (latency < 0)
1479                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1480
1481                 beaconint_us = ieee80211_tu_to_usec(
1482                                         found->vif.bss_conf.beacon_int);
1483
1484                 timeout = local->dynamic_ps_forced_timeout;
1485                 if (timeout < 0) {
1486                         /*
1487                          * Go to full PSM if the user configures a very low
1488                          * latency requirement.
1489                          * The 2000 second value is there for compatibility
1490                          * until the PM_QOS_NETWORK_LATENCY is configured
1491                          * with real values.
1492                          */
1493                         if (latency > (1900 * USEC_PER_MSEC) &&
1494                             latency != (2000 * USEC_PER_SEC))
1495                                 timeout = 0;
1496                         else
1497                                 timeout = 100;
1498                 }
1499                 local->hw.conf.dynamic_ps_timeout = timeout;
1500
1501                 if (beaconint_us > latency) {
1502                         local->ps_sdata = NULL;
1503                 } else {
1504                         int maxslp = 1;
1505                         u8 dtimper = found->u.mgd.dtim_period;
1506
1507                         /* If the TIM IE is invalid, pretend the value is 1 */
1508                         if (!dtimper)
1509                                 dtimper = 1;
1510                         else if (dtimper > 1)
1511                                 maxslp = min_t(int, dtimper,
1512                                                     latency / beaconint_us);
1513
1514                         local->hw.conf.max_sleep_period = maxslp;
1515                         local->hw.conf.ps_dtim_period = dtimper;
1516                         local->ps_sdata = found;
1517                 }
1518         } else {
1519                 local->ps_sdata = NULL;
1520         }
1521
1522         ieee80211_change_ps(local);
1523 }
1524
1525 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1526 {
1527         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1528
1529         if (sdata->vif.bss_conf.ps != ps_allowed) {
1530                 sdata->vif.bss_conf.ps = ps_allowed;
1531                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1532         }
1533 }
1534
1535 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1536 {
1537         struct ieee80211_local *local =
1538                 container_of(work, struct ieee80211_local,
1539                              dynamic_ps_disable_work);
1540
1541         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1542                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1543                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1544         }
1545
1546         ieee80211_wake_queues_by_reason(&local->hw,
1547                                         IEEE80211_MAX_QUEUE_MAP,
1548                                         IEEE80211_QUEUE_STOP_REASON_PS,
1549                                         false);
1550 }
1551
1552 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1553 {
1554         struct ieee80211_local *local =
1555                 container_of(work, struct ieee80211_local,
1556                              dynamic_ps_enable_work);
1557         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1558         struct ieee80211_if_managed *ifmgd;
1559         unsigned long flags;
1560         int q;
1561
1562         /* can only happen when PS was just disabled anyway */
1563         if (!sdata)
1564                 return;
1565
1566         ifmgd = &sdata->u.mgd;
1567
1568         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1569                 return;
1570
1571         if (local->hw.conf.dynamic_ps_timeout > 0) {
1572                 /* don't enter PS if TX frames are pending */
1573                 if (drv_tx_frames_pending(local)) {
1574                         mod_timer(&local->dynamic_ps_timer, jiffies +
1575                                   msecs_to_jiffies(
1576                                   local->hw.conf.dynamic_ps_timeout));
1577                         return;
1578                 }
1579
1580                 /*
1581                  * transmission can be stopped by others which leads to
1582                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1583                  * is not the actual idle state.
1584                  */
1585                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1586                 for (q = 0; q < local->hw.queues; q++) {
1587                         if (local->queue_stop_reasons[q]) {
1588                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1589                                                        flags);
1590                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1591                                           msecs_to_jiffies(
1592                                           local->hw.conf.dynamic_ps_timeout));
1593                                 return;
1594                         }
1595                 }
1596                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1597         }
1598
1599         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1600             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1601                 if (drv_tx_frames_pending(local)) {
1602                         mod_timer(&local->dynamic_ps_timer, jiffies +
1603                                   msecs_to_jiffies(
1604                                   local->hw.conf.dynamic_ps_timeout));
1605                 } else {
1606                         ieee80211_send_nullfunc(local, sdata, 1);
1607                         /* Flush to get the tx status of nullfunc frame */
1608                         ieee80211_flush_queues(local, sdata, false);
1609                 }
1610         }
1611
1612         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1613               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1614             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1615                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1616                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1617                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1618         }
1619 }
1620
1621 void ieee80211_dynamic_ps_timer(unsigned long data)
1622 {
1623         struct ieee80211_local *local = (void *) data;
1624
1625         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1626 }
1627
1628 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1629 {
1630         struct delayed_work *delayed_work =
1631                 container_of(work, struct delayed_work, work);
1632         struct ieee80211_sub_if_data *sdata =
1633                 container_of(delayed_work, struct ieee80211_sub_if_data,
1634                              dfs_cac_timer_work);
1635         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1636
1637         mutex_lock(&sdata->local->mtx);
1638         if (sdata->wdev.cac_started) {
1639                 ieee80211_vif_release_channel(sdata);
1640                 cfg80211_cac_event(sdata->dev, &chandef,
1641                                    NL80211_RADAR_CAC_FINISHED,
1642                                    GFP_KERNEL);
1643         }
1644         mutex_unlock(&sdata->local->mtx);
1645 }
1646
1647 static bool
1648 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1649 {
1650         struct ieee80211_local *local = sdata->local;
1651         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1652         bool ret = false;
1653         int ac;
1654
1655         if (local->hw.queues < IEEE80211_NUM_ACS)
1656                 return false;
1657
1658         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1659                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1660                 int non_acm_ac;
1661                 unsigned long now = jiffies;
1662
1663                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1664                     tx_tspec->admitted_time &&
1665                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1666                         tx_tspec->consumed_tx_time = 0;
1667                         tx_tspec->time_slice_start = now;
1668
1669                         if (tx_tspec->downgraded)
1670                                 tx_tspec->action =
1671                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1672                 }
1673
1674                 switch (tx_tspec->action) {
1675                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1676                         /* take the original parameters */
1677                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1678                                 sdata_err(sdata,
1679                                           "failed to set TX queue parameters for queue %d\n",
1680                                           ac);
1681                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1682                         tx_tspec->downgraded = false;
1683                         ret = true;
1684                         break;
1685                 case TX_TSPEC_ACTION_DOWNGRADE:
1686                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1687                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1688                                 ret = true;
1689                                 break;
1690                         }
1691                         /* downgrade next lower non-ACM AC */
1692                         for (non_acm_ac = ac + 1;
1693                              non_acm_ac < IEEE80211_NUM_ACS;
1694                              non_acm_ac++)
1695                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1696                                         break;
1697                         /* The loop will result in using BK even if it requires
1698                          * admission control, such configuration makes no sense
1699                          * and we have to transmit somehow - the AC selection
1700                          * does the same thing.
1701                          */
1702                         if (drv_conf_tx(local, sdata, ac,
1703                                         &sdata->tx_conf[non_acm_ac]))
1704                                 sdata_err(sdata,
1705                                           "failed to set TX queue parameters for queue %d\n",
1706                                           ac);
1707                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1708                         ret = true;
1709                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1710                                 tx_tspec->time_slice_start + HZ - now + 1);
1711                         break;
1712                 case TX_TSPEC_ACTION_NONE:
1713                         /* nothing now */
1714                         break;
1715                 }
1716         }
1717
1718         return ret;
1719 }
1720
1721 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1722 {
1723         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1724                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1725 }
1726
1727 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1728 {
1729         struct ieee80211_sub_if_data *sdata;
1730
1731         sdata = container_of(work, struct ieee80211_sub_if_data,
1732                              u.mgd.tx_tspec_wk.work);
1733         ieee80211_sta_handle_tspec_ac_params(sdata);
1734 }
1735
1736 /* MLME */
1737 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1738                                      struct ieee80211_sub_if_data *sdata,
1739                                      const u8 *wmm_param, size_t wmm_param_len)
1740 {
1741         struct ieee80211_tx_queue_params params;
1742         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1743         size_t left;
1744         int count;
1745         const u8 *pos;
1746         u8 uapsd_queues = 0;
1747
1748         if (!local->ops->conf_tx)
1749                 return false;
1750
1751         if (local->hw.queues < IEEE80211_NUM_ACS)
1752                 return false;
1753
1754         if (!wmm_param)
1755                 return false;
1756
1757         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1758                 return false;
1759
1760         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1761                 uapsd_queues = ifmgd->uapsd_queues;
1762
1763         count = wmm_param[6] & 0x0f;
1764         if (count == ifmgd->wmm_last_param_set)
1765                 return false;
1766         ifmgd->wmm_last_param_set = count;
1767
1768         pos = wmm_param + 8;
1769         left = wmm_param_len - 8;
1770
1771         memset(&params, 0, sizeof(params));
1772
1773         sdata->wmm_acm = 0;
1774         for (; left >= 4; left -= 4, pos += 4) {
1775                 int aci = (pos[0] >> 5) & 0x03;
1776                 int acm = (pos[0] >> 4) & 0x01;
1777                 bool uapsd = false;
1778                 int queue;
1779
1780                 switch (aci) {
1781                 case 1: /* AC_BK */
1782                         queue = 3;
1783                         if (acm)
1784                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1785                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1786                                 uapsd = true;
1787                         break;
1788                 case 2: /* AC_VI */
1789                         queue = 1;
1790                         if (acm)
1791                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1792                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1793                                 uapsd = true;
1794                         break;
1795                 case 3: /* AC_VO */
1796                         queue = 0;
1797                         if (acm)
1798                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1799                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1800                                 uapsd = true;
1801                         break;
1802                 case 0: /* AC_BE */
1803                 default:
1804                         queue = 2;
1805                         if (acm)
1806                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1807                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1808                                 uapsd = true;
1809                         break;
1810                 }
1811
1812                 params.aifs = pos[0] & 0x0f;
1813                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1814                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1815                 params.txop = get_unaligned_le16(pos + 2);
1816                 params.acm = acm;
1817                 params.uapsd = uapsd;
1818
1819                 mlme_dbg(sdata,
1820                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1821                          queue, aci, acm,
1822                          params.aifs, params.cw_min, params.cw_max,
1823                          params.txop, params.uapsd,
1824                          ifmgd->tx_tspec[queue].downgraded);
1825                 sdata->tx_conf[queue] = params;
1826                 if (!ifmgd->tx_tspec[queue].downgraded &&
1827                     drv_conf_tx(local, sdata, queue, &params))
1828                         sdata_err(sdata,
1829                                   "failed to set TX queue parameters for queue %d\n",
1830                                   queue);
1831         }
1832
1833         /* enable WMM or activate new settings */
1834         sdata->vif.bss_conf.qos = true;
1835         return true;
1836 }
1837
1838 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1839 {
1840         lockdep_assert_held(&sdata->local->mtx);
1841
1842         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1843         ieee80211_run_deferred_scan(sdata->local);
1844 }
1845
1846 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1847 {
1848         mutex_lock(&sdata->local->mtx);
1849         __ieee80211_stop_poll(sdata);
1850         mutex_unlock(&sdata->local->mtx);
1851 }
1852
1853 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1854                                            u16 capab, bool erp_valid, u8 erp)
1855 {
1856         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1857         u32 changed = 0;
1858         bool use_protection;
1859         bool use_short_preamble;
1860         bool use_short_slot;
1861
1862         if (erp_valid) {
1863                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1864                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1865         } else {
1866                 use_protection = false;
1867                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1868         }
1869
1870         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1871         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1872                 use_short_slot = true;
1873
1874         if (use_protection != bss_conf->use_cts_prot) {
1875                 bss_conf->use_cts_prot = use_protection;
1876                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1877         }
1878
1879         if (use_short_preamble != bss_conf->use_short_preamble) {
1880                 bss_conf->use_short_preamble = use_short_preamble;
1881                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1882         }
1883
1884         if (use_short_slot != bss_conf->use_short_slot) {
1885                 bss_conf->use_short_slot = use_short_slot;
1886                 changed |= BSS_CHANGED_ERP_SLOT;
1887         }
1888
1889         return changed;
1890 }
1891
1892 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1893                                      struct cfg80211_bss *cbss,
1894                                      u32 bss_info_changed)
1895 {
1896         struct ieee80211_bss *bss = (void *)cbss->priv;
1897         struct ieee80211_local *local = sdata->local;
1898         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1899
1900         bss_info_changed |= BSS_CHANGED_ASSOC;
1901         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1902                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1903
1904         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1905                 beacon_loss_count * bss_conf->beacon_int));
1906
1907         sdata->u.mgd.associated = cbss;
1908         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1909
1910         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1911
1912         if (sdata->vif.p2p) {
1913                 const struct cfg80211_bss_ies *ies;
1914
1915                 rcu_read_lock();
1916                 ies = rcu_dereference(cbss->ies);
1917                 if (ies) {
1918                         int ret;
1919
1920                         ret = cfg80211_get_p2p_attr(
1921                                         ies->data, ies->len,
1922                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1923                                         (u8 *) &bss_conf->p2p_noa_attr,
1924                                         sizeof(bss_conf->p2p_noa_attr));
1925                         if (ret >= 2) {
1926                                 sdata->u.mgd.p2p_noa_index =
1927                                         bss_conf->p2p_noa_attr.index;
1928                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1929                         }
1930                 }
1931                 rcu_read_unlock();
1932         }
1933
1934         /* just to be sure */
1935         ieee80211_stop_poll(sdata);
1936
1937         ieee80211_led_assoc(local, 1);
1938
1939         if (sdata->u.mgd.have_beacon) {
1940                 /*
1941                  * If the AP is buggy we may get here with no DTIM period
1942                  * known, so assume it's 1 which is the only safe assumption
1943                  * in that case, although if the TIM IE is broken powersave
1944                  * probably just won't work at all.
1945                  */
1946                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1947                 bss_conf->beacon_rate = bss->beacon_rate;
1948                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1949         } else {
1950                 bss_conf->beacon_rate = NULL;
1951                 bss_conf->dtim_period = 0;
1952         }
1953
1954         bss_conf->assoc = 1;
1955
1956         /* Tell the driver to monitor connection quality (if supported) */
1957         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1958             bss_conf->cqm_rssi_thold)
1959                 bss_info_changed |= BSS_CHANGED_CQM;
1960
1961         /* Enable ARP filtering */
1962         if (bss_conf->arp_addr_cnt)
1963                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1964
1965         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1966
1967         mutex_lock(&local->iflist_mtx);
1968         ieee80211_recalc_ps(local, -1);
1969         mutex_unlock(&local->iflist_mtx);
1970
1971         ieee80211_recalc_smps(sdata);
1972         ieee80211_recalc_ps_vif(sdata);
1973
1974         netif_carrier_on(sdata->dev);
1975 }
1976
1977 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1978                                    u16 stype, u16 reason, bool tx,
1979                                    u8 *frame_buf)
1980 {
1981         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1982         struct ieee80211_local *local = sdata->local;
1983         u32 changed = 0;
1984
1985         sdata_assert_lock(sdata);
1986
1987         if (WARN_ON_ONCE(tx && !frame_buf))
1988                 return;
1989
1990         if (WARN_ON(!ifmgd->associated))
1991                 return;
1992
1993         ieee80211_stop_poll(sdata);
1994
1995         ifmgd->associated = NULL;
1996         netif_carrier_off(sdata->dev);
1997
1998         /*
1999          * if we want to get out of ps before disassoc (why?) we have
2000          * to do it before sending disassoc, as otherwise the null-packet
2001          * won't be valid.
2002          */
2003         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2004                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2005                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2006         }
2007         local->ps_sdata = NULL;
2008
2009         /* disable per-vif ps */
2010         ieee80211_recalc_ps_vif(sdata);
2011
2012         /* make sure ongoing transmission finishes */
2013         synchronize_net();
2014
2015         /*
2016          * drop any frame before deauth/disassoc, this can be data or
2017          * management frame. Since we are disconnecting, we should not
2018          * insist sending these frames which can take time and delay
2019          * the disconnection and possible the roaming.
2020          */
2021         if (tx)
2022                 ieee80211_flush_queues(local, sdata, true);
2023
2024         /* deauthenticate/disassociate now */
2025         if (tx || frame_buf)
2026                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2027                                                reason, tx, frame_buf);
2028
2029         /* flush out frame - make sure the deauth was actually sent */
2030         if (tx)
2031                 ieee80211_flush_queues(local, sdata, false);
2032
2033         /* clear bssid only after building the needed mgmt frames */
2034         eth_zero_addr(ifmgd->bssid);
2035
2036         /* remove AP and TDLS peers */
2037         sta_info_flush(sdata);
2038
2039         /* finally reset all BSS / config parameters */
2040         changed |= ieee80211_reset_erp_info(sdata);
2041
2042         ieee80211_led_assoc(local, 0);
2043         changed |= BSS_CHANGED_ASSOC;
2044         sdata->vif.bss_conf.assoc = false;
2045
2046         ifmgd->p2p_noa_index = -1;
2047         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2048                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2049
2050         /* on the next assoc, re-program HT/VHT parameters */
2051         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2052         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2053         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2054         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2055
2056         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2057
2058         del_timer_sync(&local->dynamic_ps_timer);
2059         cancel_work_sync(&local->dynamic_ps_enable_work);
2060
2061         /* Disable ARP filtering */
2062         if (sdata->vif.bss_conf.arp_addr_cnt)
2063                 changed |= BSS_CHANGED_ARP_FILTER;
2064
2065         sdata->vif.bss_conf.qos = false;
2066         changed |= BSS_CHANGED_QOS;
2067
2068         /* The BSSID (not really interesting) and HT changed */
2069         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2070         ieee80211_bss_info_change_notify(sdata, changed);
2071
2072         /* disassociated - set to defaults now */
2073         ieee80211_set_wmm_default(sdata, false);
2074
2075         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2076         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2077         del_timer_sync(&sdata->u.mgd.timer);
2078         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2079
2080         sdata->vif.bss_conf.dtim_period = 0;
2081         sdata->vif.bss_conf.beacon_rate = NULL;
2082
2083         ifmgd->have_beacon = false;
2084
2085         ifmgd->flags = 0;
2086         mutex_lock(&local->mtx);
2087         ieee80211_vif_release_channel(sdata);
2088
2089         sdata->vif.csa_active = false;
2090         ifmgd->csa_waiting_bcn = false;
2091         ifmgd->csa_ignored_same_chan = false;
2092         if (sdata->csa_block_tx) {
2093                 ieee80211_wake_vif_queues(local, sdata,
2094                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2095                 sdata->csa_block_tx = false;
2096         }
2097         mutex_unlock(&local->mtx);
2098
2099         /* existing TX TSPEC sessions no longer exist */
2100         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2101         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2102
2103         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2104 }
2105
2106 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2107                              struct ieee80211_hdr *hdr)
2108 {
2109         /*
2110          * We can postpone the mgd.timer whenever receiving unicast frames
2111          * from AP because we know that the connection is working both ways
2112          * at that time. But multicast frames (and hence also beacons) must
2113          * be ignored here, because we need to trigger the timer during
2114          * data idle periods for sending the periodic probe request to the
2115          * AP we're connected to.
2116          */
2117         if (is_multicast_ether_addr(hdr->addr1))
2118                 return;
2119
2120         ieee80211_sta_reset_conn_monitor(sdata);
2121 }
2122
2123 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2124 {
2125         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2126         struct ieee80211_local *local = sdata->local;
2127
2128         mutex_lock(&local->mtx);
2129         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2130                 goto out;
2131
2132         __ieee80211_stop_poll(sdata);
2133
2134         mutex_lock(&local->iflist_mtx);
2135         ieee80211_recalc_ps(local, -1);
2136         mutex_unlock(&local->iflist_mtx);
2137
2138         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2139                 goto out;
2140
2141         /*
2142          * We've received a probe response, but are not sure whether
2143          * we have or will be receiving any beacons or data, so let's
2144          * schedule the timers again, just in case.
2145          */
2146         ieee80211_sta_reset_beacon_monitor(sdata);
2147
2148         mod_timer(&ifmgd->conn_mon_timer,
2149                   round_jiffies_up(jiffies +
2150                                    IEEE80211_CONNECTION_IDLE_TIME));
2151 out:
2152         mutex_unlock(&local->mtx);
2153 }
2154
2155 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2156                                            struct ieee80211_hdr *hdr,
2157                                            u16 tx_time)
2158 {
2159         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2160         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2161         int ac = ieee80211_ac_from_tid(tid);
2162         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2163         unsigned long now = jiffies;
2164
2165         if (likely(!tx_tspec->admitted_time))
2166                 return;
2167
2168         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2169                 tx_tspec->consumed_tx_time = 0;
2170                 tx_tspec->time_slice_start = now;
2171
2172                 if (tx_tspec->downgraded) {
2173                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2174                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2175                 }
2176         }
2177
2178         if (tx_tspec->downgraded)
2179                 return;
2180
2181         tx_tspec->consumed_tx_time += tx_time;
2182
2183         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2184                 tx_tspec->downgraded = true;
2185                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2186                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2187         }
2188 }
2189
2190 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2191                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2192 {
2193         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2194
2195         if (!ieee80211_is_data(hdr->frame_control))
2196             return;
2197
2198         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2199             sdata->u.mgd.probe_send_count > 0) {
2200                 if (ack)
2201                         ieee80211_sta_reset_conn_monitor(sdata);
2202                 else
2203                         sdata->u.mgd.nullfunc_failed = true;
2204                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2205                 return;
2206         }
2207
2208         if (ack)
2209                 ieee80211_sta_reset_conn_monitor(sdata);
2210 }
2211
2212 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2213 {
2214         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2215         const u8 *ssid;
2216         u8 *dst = ifmgd->associated->bssid;
2217         u8 unicast_limit = max(1, max_probe_tries - 3);
2218
2219         /*
2220          * Try sending broadcast probe requests for the last three
2221          * probe requests after the first ones failed since some
2222          * buggy APs only support broadcast probe requests.
2223          */
2224         if (ifmgd->probe_send_count >= unicast_limit)
2225                 dst = NULL;
2226
2227         /*
2228          * When the hardware reports an accurate Tx ACK status, it's
2229          * better to send a nullfunc frame instead of a probe request,
2230          * as it will kick us off the AP quickly if we aren't associated
2231          * anymore. The timeout will be reset if the frame is ACKed by
2232          * the AP.
2233          */
2234         ifmgd->probe_send_count++;
2235
2236         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2237                 ifmgd->nullfunc_failed = false;
2238                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2239         } else {
2240                 int ssid_len;
2241
2242                 rcu_read_lock();
2243                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2244                 if (WARN_ON_ONCE(ssid == NULL))
2245                         ssid_len = 0;
2246                 else
2247                         ssid_len = ssid[1];
2248
2249                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2250                                          ssid + 2, ssid_len, NULL,
2251                                          0, (u32) -1, true, 0,
2252                                          ifmgd->associated->channel, false);
2253                 rcu_read_unlock();
2254         }
2255
2256         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2257         run_again(sdata, ifmgd->probe_timeout);
2258 }
2259
2260 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2261                                    bool beacon)
2262 {
2263         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2264         bool already = false;
2265
2266         if (!ieee80211_sdata_running(sdata))
2267                 return;
2268
2269         sdata_lock(sdata);
2270
2271         if (!ifmgd->associated)
2272                 goto out;
2273
2274         mutex_lock(&sdata->local->mtx);
2275
2276         if (sdata->local->tmp_channel || sdata->local->scanning) {
2277                 mutex_unlock(&sdata->local->mtx);
2278                 goto out;
2279         }
2280
2281         if (beacon) {
2282                 mlme_dbg_ratelimited(sdata,
2283                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2284                                      beacon_loss_count);
2285
2286                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2287         }
2288
2289         /*
2290          * The driver/our work has already reported this event or the
2291          * connection monitoring has kicked in and we have already sent
2292          * a probe request. Or maybe the AP died and the driver keeps
2293          * reporting until we disassociate...
2294          *
2295          * In either case we have to ignore the current call to this
2296          * function (except for setting the correct probe reason bit)
2297          * because otherwise we would reset the timer every time and
2298          * never check whether we received a probe response!
2299          */
2300         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2301                 already = true;
2302
2303         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2304
2305         mutex_unlock(&sdata->local->mtx);
2306
2307         if (already)
2308                 goto out;
2309
2310         mutex_lock(&sdata->local->iflist_mtx);
2311         ieee80211_recalc_ps(sdata->local, -1);
2312         mutex_unlock(&sdata->local->iflist_mtx);
2313
2314         ifmgd->probe_send_count = 0;
2315         ieee80211_mgd_probe_ap_send(sdata);
2316  out:
2317         sdata_unlock(sdata);
2318 }
2319
2320 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2321                                           struct ieee80211_vif *vif)
2322 {
2323         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2324         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2325         struct cfg80211_bss *cbss;
2326         struct sk_buff *skb;
2327         const u8 *ssid;
2328         int ssid_len;
2329
2330         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2331                 return NULL;
2332
2333         sdata_assert_lock(sdata);
2334
2335         if (ifmgd->associated)
2336                 cbss = ifmgd->associated;
2337         else if (ifmgd->auth_data)
2338                 cbss = ifmgd->auth_data->bss;
2339         else if (ifmgd->assoc_data)
2340                 cbss = ifmgd->assoc_data->bss;
2341         else
2342                 return NULL;
2343
2344         rcu_read_lock();
2345         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2346         if (WARN_ON_ONCE(ssid == NULL))
2347                 ssid_len = 0;
2348         else
2349                 ssid_len = ssid[1];
2350
2351         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2352                                         (u32) -1, cbss->channel,
2353                                         ssid + 2, ssid_len,
2354                                         NULL, 0, true);
2355         rcu_read_unlock();
2356
2357         return skb;
2358 }
2359 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2360
2361 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2362                                         const u8 *buf, size_t len, bool tx,
2363                                         u16 reason)
2364 {
2365         struct ieee80211_event event = {
2366                 .type = MLME_EVENT,
2367                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2368                 .u.mlme.reason = reason,
2369         };
2370
2371         if (tx)
2372                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2373         else
2374                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2375
2376         drv_event_callback(sdata->local, sdata, &event);
2377 }
2378
2379 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2380 {
2381         struct ieee80211_local *local = sdata->local;
2382         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2383         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2384
2385         sdata_lock(sdata);
2386         if (!ifmgd->associated) {
2387                 sdata_unlock(sdata);
2388                 return;
2389         }
2390
2391         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2392                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2393                                true, frame_buf);
2394         mutex_lock(&local->mtx);
2395         sdata->vif.csa_active = false;
2396         ifmgd->csa_waiting_bcn = false;
2397         if (sdata->csa_block_tx) {
2398                 ieee80211_wake_vif_queues(local, sdata,
2399                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2400                 sdata->csa_block_tx = false;
2401         }
2402         mutex_unlock(&local->mtx);
2403
2404         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2405                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2406
2407         sdata_unlock(sdata);
2408 }
2409
2410 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2411 {
2412         struct ieee80211_sub_if_data *sdata =
2413                 container_of(work, struct ieee80211_sub_if_data,
2414                              u.mgd.beacon_connection_loss_work);
2415         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2416         struct sta_info *sta;
2417
2418         if (ifmgd->associated) {
2419                 rcu_read_lock();
2420                 sta = sta_info_get(sdata, ifmgd->bssid);
2421                 if (sta)
2422                         sta->beacon_loss_count++;
2423                 rcu_read_unlock();
2424         }
2425
2426         if (ifmgd->connection_loss) {
2427                 sdata_info(sdata, "Connection to AP %pM lost\n",
2428                            ifmgd->bssid);
2429                 __ieee80211_disconnect(sdata);
2430         } else {
2431                 ieee80211_mgd_probe_ap(sdata, true);
2432         }
2433 }
2434
2435 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2436 {
2437         struct ieee80211_sub_if_data *sdata =
2438                 container_of(work, struct ieee80211_sub_if_data,
2439                              u.mgd.csa_connection_drop_work);
2440
2441         __ieee80211_disconnect(sdata);
2442 }
2443
2444 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2445 {
2446         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2447         struct ieee80211_hw *hw = &sdata->local->hw;
2448
2449         trace_api_beacon_loss(sdata);
2450
2451         sdata->u.mgd.connection_loss = false;
2452         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2453 }
2454 EXPORT_SYMBOL(ieee80211_beacon_loss);
2455
2456 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2457 {
2458         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2459         struct ieee80211_hw *hw = &sdata->local->hw;
2460
2461         trace_api_connection_loss(sdata);
2462
2463         sdata->u.mgd.connection_loss = true;
2464         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2465 }
2466 EXPORT_SYMBOL(ieee80211_connection_loss);
2467
2468
2469 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2470                                         bool assoc)
2471 {
2472         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2473
2474         sdata_assert_lock(sdata);
2475
2476         if (!assoc) {
2477                 /*
2478                  * we are not authenticated yet, the only timer that could be
2479                  * running is the timeout for the authentication response which
2480                  * which is not relevant anymore.
2481                  */
2482                 del_timer_sync(&sdata->u.mgd.timer);
2483                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2484
2485                 eth_zero_addr(sdata->u.mgd.bssid);
2486                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2487                 sdata->u.mgd.flags = 0;
2488                 mutex_lock(&sdata->local->mtx);
2489                 ieee80211_vif_release_channel(sdata);
2490                 mutex_unlock(&sdata->local->mtx);
2491         }
2492
2493         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2494         kfree(auth_data);
2495         sdata->u.mgd.auth_data = NULL;
2496 }
2497
2498 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2499                                      struct ieee80211_mgmt *mgmt, size_t len)
2500 {
2501         struct ieee80211_local *local = sdata->local;
2502         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2503         u8 *pos;
2504         struct ieee802_11_elems elems;
2505         u32 tx_flags = 0;
2506
2507         pos = mgmt->u.auth.variable;
2508         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2509         if (!elems.challenge)
2510                 return;
2511         auth_data->expected_transaction = 4;
2512         drv_mgd_prepare_tx(sdata->local, sdata);
2513         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2514                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2515                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2516         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2517                             elems.challenge - 2, elems.challenge_len + 2,
2518                             auth_data->bss->bssid, auth_data->bss->bssid,
2519                             auth_data->key, auth_data->key_len,
2520                             auth_data->key_idx, tx_flags);
2521 }
2522
2523 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2524                                    struct ieee80211_mgmt *mgmt, size_t len)
2525 {
2526         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2527         u8 bssid[ETH_ALEN];
2528         u16 auth_alg, auth_transaction, status_code;
2529         struct sta_info *sta;
2530         struct ieee80211_event event = {
2531                 .type = MLME_EVENT,
2532                 .u.mlme.data = AUTH_EVENT,
2533         };
2534
2535         sdata_assert_lock(sdata);
2536
2537         if (len < 24 + 6)
2538                 return;
2539
2540         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2541                 return;
2542
2543         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2544
2545         if (!ether_addr_equal(bssid, mgmt->bssid))
2546                 return;
2547
2548         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2549         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2550         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2551
2552         if (auth_alg != ifmgd->auth_data->algorithm ||
2553             auth_transaction != ifmgd->auth_data->expected_transaction) {
2554                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2555                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2556                            auth_transaction,
2557                            ifmgd->auth_data->expected_transaction);
2558                 return;
2559         }
2560
2561         if (status_code != WLAN_STATUS_SUCCESS) {
2562                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2563                            mgmt->sa, status_code);
2564                 ieee80211_destroy_auth_data(sdata, false);
2565                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2566                 event.u.mlme.status = MLME_DENIED;
2567                 event.u.mlme.reason = status_code;
2568                 drv_event_callback(sdata->local, sdata, &event);
2569                 return;
2570         }
2571
2572         switch (ifmgd->auth_data->algorithm) {
2573         case WLAN_AUTH_OPEN:
2574         case WLAN_AUTH_LEAP:
2575         case WLAN_AUTH_FT:
2576         case WLAN_AUTH_SAE:
2577                 break;
2578         case WLAN_AUTH_SHARED_KEY:
2579                 if (ifmgd->auth_data->expected_transaction != 4) {
2580                         ieee80211_auth_challenge(sdata, mgmt, len);
2581                         /* need another frame */
2582                         return;
2583                 }
2584                 break;
2585         default:
2586                 WARN_ONCE(1, "invalid auth alg %d",
2587                           ifmgd->auth_data->algorithm);
2588                 return;
2589         }
2590
2591         event.u.mlme.status = MLME_SUCCESS;
2592         drv_event_callback(sdata->local, sdata, &event);
2593         sdata_info(sdata, "authenticated\n");
2594         ifmgd->auth_data->done = true;
2595         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2596         ifmgd->auth_data->timeout_started = true;
2597         run_again(sdata, ifmgd->auth_data->timeout);
2598
2599         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2600             ifmgd->auth_data->expected_transaction != 2) {
2601                 /*
2602                  * Report auth frame to user space for processing since another
2603                  * round of Authentication frames is still needed.
2604                  */
2605                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2606                 return;
2607         }
2608
2609         /* move station state to auth */
2610         mutex_lock(&sdata->local->sta_mtx);
2611         sta = sta_info_get(sdata, bssid);
2612         if (!sta) {
2613                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2614                 goto out_err;
2615         }
2616         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2617                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2618                 goto out_err;
2619         }
2620         mutex_unlock(&sdata->local->sta_mtx);
2621
2622         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2623         return;
2624  out_err:
2625         mutex_unlock(&sdata->local->sta_mtx);
2626         /* ignore frame -- wait for timeout */
2627 }
2628
2629 #define case_WLAN(type) \
2630         case WLAN_REASON_##type: return #type
2631
2632 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2633 {
2634         switch (reason_code) {
2635         case_WLAN(UNSPECIFIED);
2636         case_WLAN(PREV_AUTH_NOT_VALID);
2637         case_WLAN(DEAUTH_LEAVING);
2638         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2639         case_WLAN(DISASSOC_AP_BUSY);
2640         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2641         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2642         case_WLAN(DISASSOC_STA_HAS_LEFT);
2643         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2644         case_WLAN(DISASSOC_BAD_POWER);
2645         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2646         case_WLAN(INVALID_IE);
2647         case_WLAN(MIC_FAILURE);
2648         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2649         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2650         case_WLAN(IE_DIFFERENT);
2651         case_WLAN(INVALID_GROUP_CIPHER);
2652         case_WLAN(INVALID_PAIRWISE_CIPHER);
2653         case_WLAN(INVALID_AKMP);
2654         case_WLAN(UNSUPP_RSN_VERSION);
2655         case_WLAN(INVALID_RSN_IE_CAP);
2656         case_WLAN(IEEE8021X_FAILED);
2657         case_WLAN(CIPHER_SUITE_REJECTED);
2658         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2659         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2660         case_WLAN(DISASSOC_LOW_ACK);
2661         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2662         case_WLAN(QSTA_LEAVE_QBSS);
2663         case_WLAN(QSTA_NOT_USE);
2664         case_WLAN(QSTA_REQUIRE_SETUP);
2665         case_WLAN(QSTA_TIMEOUT);
2666         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2667         case_WLAN(MESH_PEER_CANCELED);
2668         case_WLAN(MESH_MAX_PEERS);
2669         case_WLAN(MESH_CONFIG);
2670         case_WLAN(MESH_CLOSE);
2671         case_WLAN(MESH_MAX_RETRIES);
2672         case_WLAN(MESH_CONFIRM_TIMEOUT);
2673         case_WLAN(MESH_INVALID_GTK);
2674         case_WLAN(MESH_INCONSISTENT_PARAM);
2675         case_WLAN(MESH_INVALID_SECURITY);
2676         case_WLAN(MESH_PATH_ERROR);
2677         case_WLAN(MESH_PATH_NOFORWARD);
2678         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2679         case_WLAN(MAC_EXISTS_IN_MBSS);
2680         case_WLAN(MESH_CHAN_REGULATORY);
2681         case_WLAN(MESH_CHAN);
2682         default: return "<unknown>";
2683         }
2684 }
2685
2686 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2687                                      struct ieee80211_mgmt *mgmt, size_t len)
2688 {
2689         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2690         const u8 *bssid = NULL;
2691         u16 reason_code;
2692
2693         sdata_assert_lock(sdata);
2694
2695         if (len < 24 + 2)
2696                 return;
2697
2698         if (!ifmgd->associated ||
2699             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2700                 return;
2701
2702         bssid = ifmgd->associated->bssid;
2703
2704         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2705
2706         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2707                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2708
2709         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2710
2711         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2712 }
2713
2714
2715 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2716                                        struct ieee80211_mgmt *mgmt, size_t len)
2717 {
2718         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2719         u16 reason_code;
2720
2721         sdata_assert_lock(sdata);
2722
2723         if (len < 24 + 2)
2724                 return;
2725
2726         if (!ifmgd->associated ||
2727             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2728                 return;
2729
2730         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2731
2732         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2733                    mgmt->sa, reason_code);
2734
2735         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2736
2737         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2738 }
2739
2740 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2741                                 u8 *supp_rates, unsigned int supp_rates_len,
2742                                 u32 *rates, u32 *basic_rates,
2743                                 bool *have_higher_than_11mbit,
2744                                 int *min_rate, int *min_rate_index,
2745                                 int shift, u32 rate_flags)
2746 {
2747         int i, j;
2748
2749         for (i = 0; i < supp_rates_len; i++) {
2750                 int rate = supp_rates[i] & 0x7f;
2751                 bool is_basic = !!(supp_rates[i] & 0x80);
2752
2753                 if ((rate * 5 * (1 << shift)) > 110)
2754                         *have_higher_than_11mbit = true;
2755
2756                 /*
2757                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2758                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2759                  *
2760                  * Note: Even through the membership selector and the basic
2761                  *       rate flag share the same bit, they are not exactly
2762                  *       the same.
2763                  */
2764                 if (!!(supp_rates[i] & 0x80) &&
2765                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2766                         continue;
2767
2768                 for (j = 0; j < sband->n_bitrates; j++) {
2769                         struct ieee80211_rate *br;
2770                         int brate;
2771
2772                         br = &sband->bitrates[j];
2773                         if ((rate_flags & br->flags) != rate_flags)
2774                                 continue;
2775
2776                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2777                         if (brate == rate) {
2778                                 *rates |= BIT(j);
2779                                 if (is_basic)
2780                                         *basic_rates |= BIT(j);
2781                                 if ((rate * 5) < *min_rate) {
2782                                         *min_rate = rate * 5;
2783                                         *min_rate_index = j;
2784                                 }
2785                                 break;
2786                         }
2787                 }
2788         }
2789 }
2790
2791 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2792                                          bool assoc)
2793 {
2794         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2795
2796         sdata_assert_lock(sdata);
2797
2798         if (!assoc) {
2799                 /*
2800                  * we are not associated yet, the only timer that could be
2801                  * running is the timeout for the association response which
2802                  * which is not relevant anymore.
2803                  */
2804                 del_timer_sync(&sdata->u.mgd.timer);
2805                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2806
2807                 eth_zero_addr(sdata->u.mgd.bssid);
2808                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2809                 sdata->u.mgd.flags = 0;
2810                 mutex_lock(&sdata->local->mtx);
2811                 ieee80211_vif_release_channel(sdata);
2812                 mutex_unlock(&sdata->local->mtx);
2813         }
2814
2815         kfree(assoc_data);
2816         sdata->u.mgd.assoc_data = NULL;
2817 }
2818
2819 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2820                                     struct cfg80211_bss *cbss,
2821                                     struct ieee80211_mgmt *mgmt, size_t len)
2822 {
2823         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2824         struct ieee80211_local *local = sdata->local;
2825         struct ieee80211_supported_band *sband;
2826         struct sta_info *sta;
2827         u8 *pos;
2828         u16 capab_info, aid;
2829         struct ieee802_11_elems elems;
2830         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2831         const struct cfg80211_bss_ies *bss_ies = NULL;
2832         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2833         u32 changed = 0;
2834         int err;
2835         bool ret;
2836
2837         /* AssocResp and ReassocResp have identical structure */
2838
2839         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2840         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2841
2842         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2843                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2844                            aid);
2845         aid &= ~(BIT(15) | BIT(14));
2846
2847         ifmgd->broken_ap = false;
2848
2849         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2850                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2851                            aid);
2852                 aid = 0;
2853                 ifmgd->broken_ap = true;
2854         }
2855
2856         pos = mgmt->u.assoc_resp.variable;
2857         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2858
2859         if (!elems.supp_rates) {
2860                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2861                 return false;
2862         }
2863
2864         ifmgd->aid = aid;
2865         ifmgd->tdls_chan_switch_prohibited =
2866                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2867                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2868
2869         /*
2870          * Some APs are erroneously not including some information in their
2871          * (re)association response frames. Try to recover by using the data
2872          * from the beacon or probe response. This seems to afflict mobile
2873          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2874          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2875          */
2876         if ((assoc_data->wmm && !elems.wmm_param) ||
2877             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2878              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2879             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2880              (!elems.vht_cap_elem || !elems.vht_operation))) {
2881                 const struct cfg80211_bss_ies *ies;
2882                 struct ieee802_11_elems bss_elems;
2883
2884                 rcu_read_lock();
2885                 ies = rcu_dereference(cbss->ies);
2886                 if (ies)
2887                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2888                                           GFP_ATOMIC);
2889                 rcu_read_unlock();
2890                 if (!bss_ies)
2891                         return false;
2892
2893                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2894                                        false, &bss_elems);
2895                 if (assoc_data->wmm &&
2896                     !elems.wmm_param && bss_elems.wmm_param) {
2897                         elems.wmm_param = bss_elems.wmm_param;
2898                         sdata_info(sdata,
2899                                    "AP bug: WMM param missing from AssocResp\n");
2900                 }
2901
2902                 /*
2903                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2904                  * have to include the IEs in the (re)association response.
2905                  */
2906                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2907                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2908                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2909                         sdata_info(sdata,
2910                                    "AP bug: HT capability missing from AssocResp\n");
2911                 }
2912                 if (!elems.ht_operation && bss_elems.ht_operation &&
2913                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2914                         elems.ht_operation = bss_elems.ht_operation;
2915                         sdata_info(sdata,
2916                                    "AP bug: HT operation missing from AssocResp\n");
2917                 }
2918                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2919                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2920                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2921                         sdata_info(sdata,
2922                                    "AP bug: VHT capa missing from AssocResp\n");
2923                 }
2924                 if (!elems.vht_operation && bss_elems.vht_operation &&
2925                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2926                         elems.vht_operation = bss_elems.vht_operation;
2927                         sdata_info(sdata,
2928                                    "AP bug: VHT operation missing from AssocResp\n");
2929                 }
2930         }
2931
2932         /*
2933          * We previously checked these in the beacon/probe response, so
2934          * they should be present here. This is just a safety net.
2935          */
2936         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2937             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2938                 sdata_info(sdata,
2939                            "HT AP is missing WMM params or HT capability/operation\n");
2940                 ret = false;
2941                 goto out;
2942         }
2943
2944         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2945             (!elems.vht_cap_elem || !elems.vht_operation)) {
2946                 sdata_info(sdata,
2947                            "VHT AP is missing VHT capability/operation\n");
2948                 ret = false;
2949                 goto out;
2950         }
2951
2952         mutex_lock(&sdata->local->sta_mtx);
2953         /*
2954          * station info was already allocated and inserted before
2955          * the association and should be available to us
2956          */
2957         sta = sta_info_get(sdata, cbss->bssid);
2958         if (WARN_ON(!sta)) {
2959                 mutex_unlock(&sdata->local->sta_mtx);
2960                 ret = false;
2961                 goto out;
2962         }
2963
2964         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2965
2966         /* Set up internal HT/VHT capabilities */
2967         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2968                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2969                                                   elems.ht_cap_elem, sta);
2970
2971         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2972                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2973                                                     elems.vht_cap_elem, sta);
2974
2975         /*
2976          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2977          * in their association response, so ignore that data for our own
2978          * configuration. If it changed since the last beacon, we'll get the
2979          * next beacon and update then.
2980          */
2981
2982         /*
2983          * If an operating mode notification IE is present, override the
2984          * NSS calculation (that would be done in rate_control_rate_init())
2985          * and use the # of streams from that element.
2986          */
2987         if (elems.opmode_notif &&
2988             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2989                 u8 nss;
2990
2991                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2992                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2993                 nss += 1;
2994                 sta->sta.rx_nss = nss;
2995         }
2996
2997         rate_control_rate_init(sta);
2998
2999         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3000                 set_sta_flag(sta, WLAN_STA_MFP);
3001                 sta->sta.mfp = true;
3002         } else {
3003                 sta->sta.mfp = false;
3004         }
3005
3006         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3007
3008         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3009         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3010                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3011         if (err) {
3012                 sdata_info(sdata,
3013                            "failed to move station %pM to desired state\n",
3014                            sta->sta.addr);
3015                 WARN_ON(__sta_info_destroy(sta));
3016                 mutex_unlock(&sdata->local->sta_mtx);
3017                 ret = false;
3018                 goto out;
3019         }
3020
3021         mutex_unlock(&sdata->local->sta_mtx);
3022
3023         /*
3024          * Always handle WMM once after association regardless
3025          * of the first value the AP uses. Setting -1 here has
3026          * that effect because the AP values is an unsigned
3027          * 4-bit value.
3028          */
3029         ifmgd->wmm_last_param_set = -1;
3030
3031         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
3032                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3033                                          elems.wmm_param_len);
3034         else
3035                 ieee80211_set_wmm_default(sdata, false);
3036         changed |= BSS_CHANGED_QOS;
3037
3038         /* set AID and assoc capability,
3039          * ieee80211_set_associated() will tell the driver */
3040         bss_conf->aid = aid;
3041         bss_conf->assoc_capability = capab_info;
3042         ieee80211_set_associated(sdata, cbss, changed);
3043
3044         /*
3045          * If we're using 4-addr mode, let the AP know that we're
3046          * doing so, so that it can create the STA VLAN on its side
3047          */
3048         if (ifmgd->use_4addr)
3049                 ieee80211_send_4addr_nullfunc(local, sdata);
3050
3051         /*
3052          * Start timer to probe the connection to the AP now.
3053          * Also start the timer that will detect beacon loss.
3054          */
3055         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3056         ieee80211_sta_reset_beacon_monitor(sdata);
3057
3058         ret = true;
3059  out:
3060         kfree(bss_ies);
3061         return ret;
3062 }
3063
3064 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3065                                          struct ieee80211_mgmt *mgmt,
3066                                          size_t len)
3067 {
3068         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3069         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3070         u16 capab_info, status_code, aid;
3071         struct ieee802_11_elems elems;
3072         int ac, uapsd_queues = -1;
3073         u8 *pos;
3074         bool reassoc;
3075         struct cfg80211_bss *bss;
3076         struct ieee80211_event event = {
3077                 .type = MLME_EVENT,
3078                 .u.mlme.data = ASSOC_EVENT,
3079         };
3080
3081         sdata_assert_lock(sdata);
3082
3083         if (!assoc_data)
3084                 return;
3085         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3086                 return;
3087
3088         /*
3089          * AssocResp and ReassocResp have identical structure, so process both
3090          * of them in this function.
3091          */
3092
3093         if (len < 24 + 6)
3094                 return;
3095
3096         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3097         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3098         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3099         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3100
3101         sdata_info(sdata,
3102                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3103                    reassoc ? "Rea" : "A", mgmt->sa,
3104                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3105
3106         pos = mgmt->u.assoc_resp.variable;
3107         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3108
3109         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3110             elems.timeout_int &&
3111             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3112                 u32 tu, ms;
3113                 tu = le32_to_cpu(elems.timeout_int->value);
3114                 ms = tu * 1024 / 1000;
3115                 sdata_info(sdata,
3116                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3117                            mgmt->sa, tu, ms);
3118                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3119                 assoc_data->timeout_started = true;
3120                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3121                         run_again(sdata, assoc_data->timeout);
3122                 return;
3123         }
3124
3125         bss = assoc_data->bss;
3126
3127         if (status_code != WLAN_STATUS_SUCCESS) {
3128                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3129                            mgmt->sa, status_code);
3130                 ieee80211_destroy_assoc_data(sdata, false);
3131                 event.u.mlme.status = MLME_DENIED;
3132                 event.u.mlme.reason = status_code;
3133                 drv_event_callback(sdata->local, sdata, &event);
3134         } else {
3135                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3136                         /* oops -- internal error -- send timeout for now */
3137                         ieee80211_destroy_assoc_data(sdata, false);
3138                         cfg80211_assoc_timeout(sdata->dev, bss);
3139                         return;
3140                 }
3141                 event.u.mlme.status = MLME_SUCCESS;
3142                 drv_event_callback(sdata->local, sdata, &event);
3143                 sdata_info(sdata, "associated\n");
3144
3145                 /*
3146                  * destroy assoc_data afterwards, as otherwise an idle
3147                  * recalc after assoc_data is NULL but before associated
3148                  * is set can cause the interface to go idle
3149                  */
3150                 ieee80211_destroy_assoc_data(sdata, true);
3151
3152                 /* get uapsd queues configuration */
3153                 uapsd_queues = 0;
3154                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3155                         if (sdata->tx_conf[ac].uapsd)
3156                                 uapsd_queues |= BIT(ac);
3157         }
3158
3159         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3160 }
3161
3162 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3163                                   struct ieee80211_mgmt *mgmt, size_t len,
3164                                   struct ieee80211_rx_status *rx_status,
3165                                   struct ieee802_11_elems *elems)
3166 {
3167         struct ieee80211_local *local = sdata->local;
3168         struct ieee80211_bss *bss;
3169         struct ieee80211_channel *channel;
3170
3171         sdata_assert_lock(sdata);
3172
3173         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3174         if (!channel)
3175                 return;
3176
3177         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3178                                         channel);
3179         if (bss) {
3180                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3181                 ieee80211_rx_bss_put(local, bss);
3182         }
3183 }
3184
3185
3186 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3187                                          struct sk_buff *skb)
3188 {
3189         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3190         struct ieee80211_if_managed *ifmgd;
3191         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3192         size_t baselen, len = skb->len;
3193         struct ieee802_11_elems elems;
3194
3195         ifmgd = &sdata->u.mgd;
3196
3197         sdata_assert_lock(sdata);
3198
3199         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3200                 return; /* ignore ProbeResp to foreign address */
3201
3202         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3203         if (baselen > len)
3204                 return;
3205
3206         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3207                                false, &elems);
3208
3209         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3210
3211         if (ifmgd->associated &&
3212             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3213                 ieee80211_reset_ap_probe(sdata);
3214
3215         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3216             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3217                 /* got probe response, continue with auth */
3218                 sdata_info(sdata, "direct probe responded\n");
3219                 ifmgd->auth_data->tries = 0;
3220                 ifmgd->auth_data->timeout = jiffies;
3221                 ifmgd->auth_data->timeout_started = true;
3222                 run_again(sdata, ifmgd->auth_data->timeout);
3223         }
3224 }
3225
3226 /*
3227  * This is the canonical list of information elements we care about,
3228  * the filter code also gives us all changes to the Microsoft OUI
3229  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3230  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3231  * changes to requested client power.
3232  *
3233  * We implement beacon filtering in software since that means we can
3234  * avoid processing the frame here and in cfg80211, and userspace
3235  * will not be able to tell whether the hardware supports it or not.
3236  *
3237  * XXX: This list needs to be dynamic -- userspace needs to be able to
3238  *      add items it requires. It also needs to be able to tell us to
3239  *      look out for other vendor IEs.
3240  */
3241 static const u64 care_about_ies =
3242         (1ULL << WLAN_EID_COUNTRY) |
3243         (1ULL << WLAN_EID_ERP_INFO) |
3244         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3245         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3246         (1ULL << WLAN_EID_HT_CAPABILITY) |
3247         (1ULL << WLAN_EID_HT_OPERATION) |
3248         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3249
3250 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3251                                      struct ieee80211_mgmt *mgmt, size_t len,
3252                                      struct ieee80211_rx_status *rx_status)
3253 {
3254         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3255         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3256         size_t baselen;
3257         struct ieee802_11_elems elems;
3258         struct ieee80211_local *local = sdata->local;
3259         struct ieee80211_chanctx_conf *chanctx_conf;
3260         struct ieee80211_channel *chan;
3261         struct sta_info *sta;
3262         u32 changed = 0;
3263         bool erp_valid;
3264         u8 erp_value = 0;
3265         u32 ncrc;
3266         u8 *bssid;
3267         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3268
3269         sdata_assert_lock(sdata);
3270
3271         /* Process beacon from the current BSS */
3272         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3273         if (baselen > len)
3274                 return;
3275
3276         rcu_read_lock();
3277         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3278         if (!chanctx_conf) {
3279                 rcu_read_unlock();
3280                 return;
3281         }
3282
3283         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3284                 rcu_read_unlock();
3285                 return;
3286         }
3287         chan = chanctx_conf->def.chan;
3288         rcu_read_unlock();
3289
3290         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3291             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3292                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3293                                        len - baselen, false, &elems);
3294
3295                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3296                 if (elems.tim && !elems.parse_error) {
3297                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3298                         ifmgd->dtim_period = tim_ie->dtim_period;
3299                 }
3300                 ifmgd->have_beacon = true;
3301                 ifmgd->assoc_data->need_beacon = false;
3302                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3303                         sdata->vif.bss_conf.sync_tsf =
3304                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3305                         sdata->vif.bss_conf.sync_device_ts =
3306                                 rx_status->device_timestamp;
3307                         if (elems.tim)
3308                                 sdata->vif.bss_conf.sync_dtim_count =
3309                                         elems.tim->dtim_count;
3310                         else
3311                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3312                 }
3313                 /* continue assoc process */
3314                 ifmgd->assoc_data->timeout = jiffies;
3315                 ifmgd->assoc_data->timeout_started = true;
3316                 run_again(sdata, ifmgd->assoc_data->timeout);
3317                 return;
3318         }
3319
3320         if (!ifmgd->associated ||
3321             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3322                 return;
3323         bssid = ifmgd->associated->bssid;
3324
3325         /* Track average RSSI from the Beacon frames of the current AP */
3326         ifmgd->last_beacon_signal = rx_status->signal;
3327         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3328                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3329                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3330                 ifmgd->last_cqm_event_signal = 0;
3331                 ifmgd->count_beacon_signal = 1;
3332                 ifmgd->last_ave_beacon_signal = 0;
3333         } else {
3334                 ifmgd->ave_beacon_signal =
3335                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3336                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3337                          ifmgd->ave_beacon_signal) / 16;
3338                 ifmgd->count_beacon_signal++;
3339         }
3340
3341         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3342             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3343                 int sig = ifmgd->ave_beacon_signal;
3344                 int last_sig = ifmgd->last_ave_beacon_signal;
3345                 struct ieee80211_event event = {
3346                         .type = RSSI_EVENT,
3347                 };
3348
3349                 /*
3350                  * if signal crosses either of the boundaries, invoke callback
3351                  * with appropriate parameters
3352                  */
3353                 if (sig > ifmgd->rssi_max_thold &&
3354                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3355                         ifmgd->last_ave_beacon_signal = sig;
3356                         event.u.rssi.data = RSSI_EVENT_HIGH;
3357                         drv_event_callback(local, sdata, &event);
3358                 } else if (sig < ifmgd->rssi_min_thold &&
3359                            (last_sig >= ifmgd->rssi_max_thold ||
3360                            last_sig == 0)) {
3361                         ifmgd->last_ave_beacon_signal = sig;
3362                         event.u.rssi.data = RSSI_EVENT_LOW;
3363                         drv_event_callback(local, sdata, &event);
3364                 }
3365         }
3366
3367         if (bss_conf->cqm_rssi_thold &&
3368             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3369             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3370                 int sig = ifmgd->ave_beacon_signal / 16;
3371                 int last_event = ifmgd->last_cqm_event_signal;
3372                 int thold = bss_conf->cqm_rssi_thold;
3373                 int hyst = bss_conf->cqm_rssi_hyst;
3374                 if (sig < thold &&
3375                     (last_event == 0 || sig < last_event - hyst)) {
3376                         ifmgd->last_cqm_event_signal = sig;
3377                         ieee80211_cqm_rssi_notify(
3378                                 &sdata->vif,
3379                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3380                                 GFP_KERNEL);
3381                 } else if (sig > thold &&
3382                            (last_event == 0 || sig > last_event + hyst)) {
3383                         ifmgd->last_cqm_event_signal = sig;
3384                         ieee80211_cqm_rssi_notify(
3385                                 &sdata->vif,
3386                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3387                                 GFP_KERNEL);
3388                 }
3389         }
3390
3391         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3392                 mlme_dbg_ratelimited(sdata,
3393                                      "cancelling AP probe due to a received beacon\n");
3394                 ieee80211_reset_ap_probe(sdata);
3395         }
3396
3397         /*
3398          * Push the beacon loss detection into the future since
3399          * we are processing a beacon from the AP just now.
3400          */
3401         ieee80211_sta_reset_beacon_monitor(sdata);
3402
3403         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3404         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3405                                           len - baselen, false, &elems,
3406                                           care_about_ies, ncrc);
3407
3408         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3409                 bool directed_tim = ieee80211_check_tim(elems.tim,
3410                                                         elems.tim_len,
3411                                                         ifmgd->aid);
3412                 if (directed_tim) {
3413                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3414                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3415                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3416                                         ieee80211_hw_config(local,
3417                                                             IEEE80211_CONF_CHANGE_PS);
3418                                 }
3419                                 ieee80211_send_nullfunc(local, sdata, 0);
3420                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3421                                 local->pspolling = true;
3422
3423                                 /*
3424                                  * Here is assumed that the driver will be
3425                                  * able to send ps-poll frame and receive a
3426                                  * response even though power save mode is
3427                                  * enabled, but some drivers might require
3428                                  * to disable power save here. This needs
3429                                  * to be investigated.
3430                                  */
3431                                 ieee80211_send_pspoll(local, sdata);
3432                         }
3433                 }
3434         }
3435
3436         if (sdata->vif.p2p) {
3437                 struct ieee80211_p2p_noa_attr noa = {};
3438                 int ret;
3439
3440                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3441                                             len - baselen,
3442                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3443                                             (u8 *) &noa, sizeof(noa));
3444                 if (ret >= 2) {
3445                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3446                                 /* valid noa_attr and index changed */
3447                                 sdata->u.mgd.p2p_noa_index = noa.index;
3448                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3449                                 changed |= BSS_CHANGED_P2P_PS;
3450                                 /*
3451                                  * make sure we update all information, the CRC
3452                                  * mechanism doesn't look at P2P attributes.
3453                                  */
3454                                 ifmgd->beacon_crc_valid = false;
3455                         }
3456                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3457                         /* noa_attr not found and we had valid noa_attr before */
3458                         sdata->u.mgd.p2p_noa_index = -1;
3459                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3460                         changed |= BSS_CHANGED_P2P_PS;
3461                         ifmgd->beacon_crc_valid = false;
3462                 }
3463         }
3464
3465         if (ifmgd->csa_waiting_bcn)
3466                 ieee80211_chswitch_post_beacon(sdata);
3467
3468         /*
3469          * Update beacon timing and dtim count on every beacon appearance. This
3470          * will allow the driver to use the most updated values. Do it before
3471          * comparing this one with last received beacon.
3472          * IMPORTANT: These parameters would possibly be out of sync by the time
3473          * the driver will use them. The synchronized view is currently
3474          * guaranteed only in certain callbacks.
3475          */
3476         if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3477                 sdata->vif.bss_conf.sync_tsf =
3478                         le64_to_cpu(mgmt->u.beacon.timestamp);
3479                 sdata->vif.bss_conf.sync_device_ts =
3480                         rx_status->device_timestamp;
3481                 if (elems.tim)
3482                         sdata->vif.bss_conf.sync_dtim_count =
3483                                 elems.tim->dtim_count;
3484                 else
3485                         sdata->vif.bss_conf.sync_dtim_count = 0;
3486         }
3487
3488         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3489                 return;
3490         ifmgd->beacon_crc = ncrc;
3491         ifmgd->beacon_crc_valid = true;
3492
3493         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3494
3495         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3496                                          rx_status->device_timestamp,
3497                                          &elems, true);
3498
3499         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3500             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3501                                      elems.wmm_param_len))
3502                 changed |= BSS_CHANGED_QOS;
3503
3504         /*
3505          * If we haven't had a beacon before, tell the driver about the
3506          * DTIM period (and beacon timing if desired) now.
3507          */
3508         if (!ifmgd->have_beacon) {
3509                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3510                 if (elems.tim)
3511                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3512                 else
3513                         bss_conf->dtim_period = 1;
3514
3515                 changed |= BSS_CHANGED_BEACON_INFO;
3516                 ifmgd->have_beacon = true;
3517
3518                 mutex_lock(&local->iflist_mtx);
3519                 ieee80211_recalc_ps(local, -1);
3520                 mutex_unlock(&local->iflist_mtx);
3521
3522                 ieee80211_recalc_ps_vif(sdata);
3523         }
3524
3525         if (elems.erp_info) {
3526                 erp_valid = true;
3527                 erp_value = elems.erp_info[0];
3528         } else {
3529                 erp_valid = false;
3530         }
3531         changed |= ieee80211_handle_bss_capability(sdata,
3532                         le16_to_cpu(mgmt->u.beacon.capab_info),
3533                         erp_valid, erp_value);
3534
3535         mutex_lock(&local->sta_mtx);
3536         sta = sta_info_get(sdata, bssid);
3537
3538         if (ieee80211_config_bw(sdata, sta,
3539                                 elems.ht_cap_elem, elems.ht_operation,
3540                                 elems.vht_operation, bssid, &changed)) {
3541                 mutex_unlock(&local->sta_mtx);
3542                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3543                                        WLAN_REASON_DEAUTH_LEAVING,
3544                                        true, deauth_buf);
3545                 ieee80211_report_disconnect(sdata, deauth_buf,
3546                                             sizeof(deauth_buf), true,
3547                                             WLAN_REASON_DEAUTH_LEAVING);
3548                 return;
3549         }
3550
3551         if (sta && elems.opmode_notif)
3552                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3553                                             rx_status->band, true);
3554         mutex_unlock(&local->sta_mtx);
3555
3556         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3557                                                elems.country_elem,
3558                                                elems.country_elem_len,
3559                                                elems.pwr_constr_elem,
3560                                                elems.cisco_dtpc_elem);
3561
3562         ieee80211_bss_info_change_notify(sdata, changed);
3563 }
3564
3565 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3566                                   struct sk_buff *skb)
3567 {
3568         struct ieee80211_rx_status *rx_status;
3569         struct ieee80211_mgmt *mgmt;
3570         u16 fc;
3571         struct ieee802_11_elems elems;
3572         int ies_len;
3573
3574         rx_status = (struct ieee80211_rx_status *) skb->cb;
3575         mgmt = (struct ieee80211_mgmt *) skb->data;
3576         fc = le16_to_cpu(mgmt->frame_control);
3577
3578         sdata_lock(sdata);
3579
3580         switch (fc & IEEE80211_FCTL_STYPE) {
3581         case IEEE80211_STYPE_BEACON:
3582                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3583                 break;
3584         case IEEE80211_STYPE_PROBE_RESP:
3585                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3586                 break;
3587         case IEEE80211_STYPE_AUTH:
3588                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3589                 break;
3590         case IEEE80211_STYPE_DEAUTH:
3591                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3592                 break;
3593         case IEEE80211_STYPE_DISASSOC:
3594                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3595                 break;
3596         case IEEE80211_STYPE_ASSOC_RESP:
3597         case IEEE80211_STYPE_REASSOC_RESP:
3598                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3599                 break;
3600         case IEEE80211_STYPE_ACTION:
3601                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3602                         ies_len = skb->len -
3603                                   offsetof(struct ieee80211_mgmt,
3604                                            u.action.u.chan_switch.variable);
3605
3606                         if (ies_len < 0)
3607                                 break;
3608
3609                         ieee802_11_parse_elems(
3610                                 mgmt->u.action.u.chan_switch.variable,
3611                                 ies_len, true, &elems);
3612
3613                         if (elems.parse_error)
3614                                 break;
3615
3616                         ieee80211_sta_process_chanswitch(sdata,
3617                                                  rx_status->mactime,
3618                                                  rx_status->device_timestamp,
3619                                                  &elems, false);
3620                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3621                         ies_len = skb->len -
3622                                   offsetof(struct ieee80211_mgmt,
3623                                            u.action.u.ext_chan_switch.variable);
3624
3625                         if (ies_len < 0)
3626                                 break;
3627
3628                         ieee802_11_parse_elems(
3629                                 mgmt->u.action.u.ext_chan_switch.variable,
3630                                 ies_len, true, &elems);
3631
3632                         if (elems.parse_error)
3633                                 break;
3634
3635                         /* for the handling code pretend this was also an IE */
3636                         elems.ext_chansw_ie =
3637                                 &mgmt->u.action.u.ext_chan_switch.data;
3638
3639                         ieee80211_sta_process_chanswitch(sdata,
3640                                                  rx_status->mactime,
3641                                                  rx_status->device_timestamp,
3642                                                  &elems, false);
3643                 }
3644                 break;
3645         }
3646         sdata_unlock(sdata);
3647 }
3648
3649 static void ieee80211_sta_timer(unsigned long data)
3650 {
3651         struct ieee80211_sub_if_data *sdata =
3652                 (struct ieee80211_sub_if_data *) data;
3653
3654         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3655 }
3656
3657 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3658                                           u8 *bssid, u8 reason, bool tx)
3659 {
3660         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3661
3662         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3663                                tx, frame_buf);
3664
3665         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3666                                     reason);
3667 }
3668
3669 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3670 {
3671         struct ieee80211_local *local = sdata->local;
3672         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3673         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3674         u32 tx_flags = 0;
3675
3676         sdata_assert_lock(sdata);
3677
3678         if (WARN_ON_ONCE(!auth_data))
3679                 return -EINVAL;
3680
3681         auth_data->tries++;
3682
3683         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3684                 sdata_info(sdata, "authentication with %pM timed out\n",
3685                            auth_data->bss->bssid);
3686
3687                 /*
3688                  * Most likely AP is not in the range so remove the
3689                  * bss struct for that AP.
3690                  */
3691                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3692
3693                 return -ETIMEDOUT;
3694         }
3695
3696         drv_mgd_prepare_tx(local, sdata);
3697
3698         if (auth_data->bss->proberesp_ies) {
3699                 u16 trans = 1;
3700                 u16 status = 0;
3701
3702                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3703                            auth_data->bss->bssid, auth_data->tries,
3704                            IEEE80211_AUTH_MAX_TRIES);
3705
3706                 auth_data->expected_transaction = 2;
3707
3708                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3709                         trans = auth_data->sae_trans;
3710                         status = auth_data->sae_status;
3711                         auth_data->expected_transaction = trans;
3712                 }
3713
3714                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3715                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3716                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3717
3718                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3719                                     auth_data->data, auth_data->data_len,
3720                                     auth_data->bss->bssid,
3721                                     auth_data->bss->bssid, NULL, 0, 0,
3722                                     tx_flags);
3723         } else {
3724                 const u8 *ssidie;
3725
3726                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3727                            auth_data->bss->bssid, auth_data->tries,
3728                            IEEE80211_AUTH_MAX_TRIES);
3729
3730                 rcu_read_lock();
3731                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3732                 if (!ssidie) {
3733                         rcu_read_unlock();
3734                         return -EINVAL;
3735                 }
3736                 /*
3737                  * Direct probe is sent to broadcast address as some APs
3738                  * will not answer to direct packet in unassociated state.
3739                  */
3740                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
3741                                          ssidie + 2, ssidie[1],
3742                                          NULL, 0, (u32) -1, true, 0,
3743                                          auth_data->bss->channel, false);
3744                 rcu_read_unlock();
3745         }
3746
3747         if (tx_flags == 0) {
3748                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3749                 auth_data->timeout_started = true;
3750                 run_again(sdata, auth_data->timeout);
3751         } else {
3752                 auth_data->timeout =
3753                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3754                 auth_data->timeout_started = true;
3755                 run_again(sdata, auth_data->timeout);
3756         }
3757
3758         return 0;
3759 }
3760
3761 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3762 {
3763         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3764         struct ieee80211_local *local = sdata->local;
3765
3766         sdata_assert_lock(sdata);
3767
3768         assoc_data->tries++;
3769         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3770                 sdata_info(sdata, "association with %pM timed out\n",
3771                            assoc_data->bss->bssid);
3772
3773                 /*
3774                  * Most likely AP is not in the range so remove the
3775                  * bss struct for that AP.
3776                  */
3777                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3778
3779                 return -ETIMEDOUT;
3780         }
3781
3782         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3783                    assoc_data->bss->bssid, assoc_data->tries,
3784                    IEEE80211_ASSOC_MAX_TRIES);
3785         ieee80211_send_assoc(sdata);
3786
3787         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3788                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3789                 assoc_data->timeout_started = true;
3790                 run_again(sdata, assoc_data->timeout);
3791         } else {
3792                 assoc_data->timeout =
3793                         round_jiffies_up(jiffies +
3794                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3795                 assoc_data->timeout_started = true;
3796                 run_again(sdata, assoc_data->timeout);
3797         }
3798
3799         return 0;
3800 }
3801
3802 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3803                                   __le16 fc, bool acked)
3804 {
3805         struct ieee80211_local *local = sdata->local;
3806
3807         sdata->u.mgd.status_fc = fc;
3808         sdata->u.mgd.status_acked = acked;
3809         sdata->u.mgd.status_received = true;
3810
3811         ieee80211_queue_work(&local->hw, &sdata->work);
3812 }
3813
3814 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3815 {
3816         struct ieee80211_local *local = sdata->local;
3817         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3818
3819         sdata_lock(sdata);
3820
3821         if (ifmgd->status_received) {
3822                 __le16 fc = ifmgd->status_fc;
3823                 bool status_acked = ifmgd->status_acked;
3824
3825                 ifmgd->status_received = false;
3826                 if (ifmgd->auth_data &&
3827                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3828                         if (status_acked) {
3829                                 ifmgd->auth_data->timeout =
3830                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3831                                 run_again(sdata, ifmgd->auth_data->timeout);
3832                         } else {
3833                                 ifmgd->auth_data->timeout = jiffies - 1;
3834                         }
3835                         ifmgd->auth_data->timeout_started = true;
3836                 } else if (ifmgd->assoc_data &&
3837                            (ieee80211_is_assoc_req(fc) ||
3838                             ieee80211_is_reassoc_req(fc))) {
3839                         if (status_acked) {
3840                                 ifmgd->assoc_data->timeout =
3841                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3842                                 run_again(sdata, ifmgd->assoc_data->timeout);
3843                         } else {
3844                                 ifmgd->assoc_data->timeout = jiffies - 1;
3845                         }
3846                         ifmgd->assoc_data->timeout_started = true;
3847                 }
3848         }
3849
3850         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3851             time_after(jiffies, ifmgd->auth_data->timeout)) {
3852                 if (ifmgd->auth_data->done) {
3853                         /*
3854                          * ok ... we waited for assoc but userspace didn't,
3855                          * so let's just kill the auth data
3856                          */
3857                         ieee80211_destroy_auth_data(sdata, false);
3858                 } else if (ieee80211_probe_auth(sdata)) {
3859                         u8 bssid[ETH_ALEN];
3860                         struct ieee80211_event event = {
3861                                 .type = MLME_EVENT,
3862                                 .u.mlme.data = AUTH_EVENT,
3863                                 .u.mlme.status = MLME_TIMEOUT,
3864                         };
3865
3866                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3867
3868                         ieee80211_destroy_auth_data(sdata, false);
3869
3870                         cfg80211_auth_timeout(sdata->dev, bssid);
3871                         drv_event_callback(sdata->local, sdata, &event);
3872                 }
3873         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3874                 run_again(sdata, ifmgd->auth_data->timeout);
3875
3876         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3877             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3878                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3879                     ieee80211_do_assoc(sdata)) {
3880                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3881                         struct ieee80211_event event = {
3882                                 .type = MLME_EVENT,
3883                                 .u.mlme.data = ASSOC_EVENT,
3884                                 .u.mlme.status = MLME_TIMEOUT,
3885                         };
3886
3887                         ieee80211_destroy_assoc_data(sdata, false);
3888                         cfg80211_assoc_timeout(sdata->dev, bss);
3889                         drv_event_callback(sdata->local, sdata, &event);
3890                 }
3891         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3892                 run_again(sdata, ifmgd->assoc_data->timeout);
3893
3894         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3895             ifmgd->associated) {
3896                 u8 bssid[ETH_ALEN];
3897                 int max_tries;
3898
3899                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3900
3901                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3902                         max_tries = max_nullfunc_tries;
3903                 else
3904                         max_tries = max_probe_tries;
3905
3906                 /* ACK received for nullfunc probing frame */
3907                 if (!ifmgd->probe_send_count)
3908                         ieee80211_reset_ap_probe(sdata);
3909                 else if (ifmgd->nullfunc_failed) {
3910                         if (ifmgd->probe_send_count < max_tries) {
3911                                 mlme_dbg(sdata,
3912                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3913                                          bssid, ifmgd->probe_send_count,
3914                                          max_tries);
3915                                 ieee80211_mgd_probe_ap_send(sdata);
3916                         } else {
3917                                 mlme_dbg(sdata,
3918                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3919                                          bssid);
3920                                 ieee80211_sta_connection_lost(sdata, bssid,
3921                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3922                                         false);
3923                         }
3924                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3925                         run_again(sdata, ifmgd->probe_timeout);
3926                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3927                         mlme_dbg(sdata,
3928                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3929                                  bssid, probe_wait_ms);
3930                         ieee80211_sta_connection_lost(sdata, bssid,
3931                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3932                 } else if (ifmgd->probe_send_count < max_tries) {
3933                         mlme_dbg(sdata,
3934                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3935                                  bssid, probe_wait_ms,
3936                                  ifmgd->probe_send_count, max_tries);
3937                         ieee80211_mgd_probe_ap_send(sdata);
3938                 } else {
3939                         /*
3940                          * We actually lost the connection ... or did we?
3941                          * Let's make sure!
3942                          */
3943                         wiphy_debug(local->hw.wiphy,
3944                                     "%s: No probe response from AP %pM"
3945                                     " after %dms, disconnecting.\n",
3946                                     sdata->name,
3947                                     bssid, probe_wait_ms);
3948
3949                         ieee80211_sta_connection_lost(sdata, bssid,
3950                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3951                 }
3952         }
3953
3954         sdata_unlock(sdata);
3955 }
3956
3957 static void ieee80211_sta_bcn_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
3963         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3964                 return;
3965
3966         sdata->u.mgd.connection_loss = false;
3967         ieee80211_queue_work(&sdata->local->hw,
3968                              &sdata->u.mgd.beacon_connection_loss_work);
3969 }
3970
3971 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3972 {
3973         struct ieee80211_sub_if_data *sdata =
3974                 (struct ieee80211_sub_if_data *) data;
3975         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3976         struct ieee80211_local *local = sdata->local;
3977
3978         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3979                 return;
3980
3981         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3982 }
3983
3984 static void ieee80211_sta_monitor_work(struct work_struct *work)
3985 {
3986         struct ieee80211_sub_if_data *sdata =
3987                 container_of(work, struct ieee80211_sub_if_data,
3988                              u.mgd.monitor_work);
3989
3990         ieee80211_mgd_probe_ap(sdata, false);
3991 }
3992
3993 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3994 {
3995         u32 flags;
3996
3997         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3998                 __ieee80211_stop_poll(sdata);
3999
4000                 /* let's probe the connection once */
4001                 flags = sdata->local->hw.flags;
4002                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
4003                         ieee80211_queue_work(&sdata->local->hw,
4004                                              &sdata->u.mgd.monitor_work);
4005                 /* and do all the other regular work too */
4006                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
4007         }
4008 }
4009
4010 #ifdef CONFIG_PM
4011 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4012 {
4013         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4014         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4015
4016         sdata_lock(sdata);
4017
4018         if (ifmgd->auth_data || ifmgd->assoc_data) {
4019                 const u8 *bssid = ifmgd->auth_data ?
4020                                 ifmgd->auth_data->bss->bssid :
4021                                 ifmgd->assoc_data->bss->bssid;
4022
4023                 /*
4024                  * If we are trying to authenticate / associate while suspending,
4025                  * cfg80211 won't know and won't actually abort those attempts,
4026                  * thus we need to do that ourselves.
4027                  */
4028                 ieee80211_send_deauth_disassoc(sdata, bssid,
4029                                                IEEE80211_STYPE_DEAUTH,
4030                                                WLAN_REASON_DEAUTH_LEAVING,
4031                                                false, frame_buf);
4032                 if (ifmgd->assoc_data)
4033                         ieee80211_destroy_assoc_data(sdata, false);
4034                 if (ifmgd->auth_data)
4035                         ieee80211_destroy_auth_data(sdata, false);
4036                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4037                                       IEEE80211_DEAUTH_FRAME_LEN);
4038         }
4039
4040         /* This is a bit of a hack - we should find a better and more generic
4041          * solution to this. Normally when suspending, cfg80211 will in fact
4042          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4043          * auth (not so important) or assoc (this is the problem) process.
4044          *
4045          * As a consequence, it can happen that we are in the process of both
4046          * associating and suspending, and receive an association response
4047          * after cfg80211 has checked if it needs to disconnect, but before
4048          * we actually set the flag to drop incoming frames. This will then
4049          * cause the workqueue flush to process the association response in
4050          * the suspend, resulting in a successful association just before it
4051          * tries to remove the interface from the driver, which now though
4052          * has a channel context assigned ... this results in issues.
4053          *
4054          * To work around this (for now) simply deauth here again if we're
4055          * now connected.
4056          */
4057         if (ifmgd->associated && !sdata->local->wowlan) {
4058                 u8 bssid[ETH_ALEN];
4059                 struct cfg80211_deauth_request req = {
4060                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4061                         .bssid = bssid,
4062                 };
4063
4064                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4065                 ieee80211_mgd_deauth(sdata, &req);
4066         }
4067
4068         sdata_unlock(sdata);
4069 }
4070
4071 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4072 {
4073         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4074
4075         sdata_lock(sdata);
4076         if (!ifmgd->associated) {
4077                 sdata_unlock(sdata);
4078                 return;
4079         }
4080
4081         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4082                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4083                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4084                 ieee80211_sta_connection_lost(sdata,
4085                                               ifmgd->associated->bssid,
4086                                               WLAN_REASON_UNSPECIFIED,
4087                                               true);
4088                 sdata_unlock(sdata);
4089                 return;
4090         }
4091         sdata_unlock(sdata);
4092 }
4093 #endif
4094
4095 /* interface setup */
4096 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4097 {
4098         struct ieee80211_if_managed *ifmgd;
4099
4100         ifmgd = &sdata->u.mgd;
4101         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4102         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4103         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4104                   ieee80211_beacon_connection_loss_work);
4105         INIT_WORK(&ifmgd->csa_connection_drop_work,
4106                   ieee80211_csa_connection_drop_work);
4107         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4108         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4109                           ieee80211_tdls_peer_del_work);
4110         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4111                     (unsigned long) sdata);
4112         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4113                     (unsigned long) sdata);
4114         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4115                     (unsigned long) sdata);
4116         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4117                     (unsigned long) sdata);
4118         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4119                           ieee80211_sta_handle_tspec_ac_params_wk);
4120
4121         ifmgd->flags = 0;
4122         ifmgd->powersave = sdata->wdev.ps;
4123         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4124         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4125         ifmgd->p2p_noa_index = -1;
4126
4127         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4128                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4129         else
4130                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4131
4132         /* Setup TDLS data */
4133         spin_lock_init(&ifmgd->teardown_lock);
4134         ifmgd->teardown_skb = NULL;
4135         ifmgd->orig_teardown_skb = NULL;
4136 }
4137
4138 /* scan finished notification */
4139 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4140 {
4141         struct ieee80211_sub_if_data *sdata;
4142
4143         /* Restart STA timers */
4144         rcu_read_lock();
4145         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4146                 if (ieee80211_sdata_running(sdata))
4147                         ieee80211_restart_sta_timer(sdata);
4148         }
4149         rcu_read_unlock();
4150 }
4151
4152 int ieee80211_max_network_latency(struct notifier_block *nb,
4153                                   unsigned long data, void *dummy)
4154 {
4155         s32 latency_usec = (s32) data;
4156         struct ieee80211_local *local =
4157                 container_of(nb, struct ieee80211_local,
4158                              network_latency_notifier);
4159
4160         mutex_lock(&local->iflist_mtx);
4161         ieee80211_recalc_ps(local, latency_usec);
4162         mutex_unlock(&local->iflist_mtx);
4163
4164         return NOTIFY_OK;
4165 }
4166
4167 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4168                                      struct cfg80211_bss *cbss)
4169 {
4170         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4171         const u8 *ht_cap_ie, *vht_cap_ie;
4172         const struct ieee80211_ht_cap *ht_cap;
4173         const struct ieee80211_vht_cap *vht_cap;
4174         u8 chains = 1;
4175
4176         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4177                 return chains;
4178
4179         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4180         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4181                 ht_cap = (void *)(ht_cap_ie + 2);
4182                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4183                 /*
4184                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4185                  *       "Tx Unequal Modulation Supported" fields.
4186                  */
4187         }
4188
4189         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4190                 return chains;
4191
4192         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4193         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4194                 u8 nss;
4195                 u16 tx_mcs_map;
4196
4197                 vht_cap = (void *)(vht_cap_ie + 2);
4198                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4199                 for (nss = 8; nss > 0; nss--) {
4200                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4201                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4202                                 break;
4203                 }
4204                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4205                 chains = max(chains, nss);
4206         }
4207
4208         return chains;
4209 }
4210
4211 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4212                                   struct cfg80211_bss *cbss)
4213 {
4214         struct ieee80211_local *local = sdata->local;
4215         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4216         const struct ieee80211_ht_cap *ht_cap = NULL;
4217         const struct ieee80211_ht_operation *ht_oper = NULL;
4218         const struct ieee80211_vht_operation *vht_oper = NULL;
4219         struct ieee80211_supported_band *sband;
4220         struct cfg80211_chan_def chandef;
4221         int ret;
4222
4223         sband = local->hw.wiphy->bands[cbss->channel->band];
4224
4225         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4226                           IEEE80211_STA_DISABLE_80P80MHZ |
4227                           IEEE80211_STA_DISABLE_160MHZ);
4228
4229         rcu_read_lock();
4230
4231         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4232             sband->ht_cap.ht_supported) {
4233                 const u8 *ht_oper_ie, *ht_cap_ie;
4234
4235                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4236                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4237                         ht_oper = (void *)(ht_oper_ie + 2);
4238
4239                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4240                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4241                         ht_cap = (void *)(ht_cap_ie + 2);
4242
4243                 if (!ht_cap) {
4244                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4245                         ht_oper = NULL;
4246                 }
4247         }
4248
4249         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4250             sband->vht_cap.vht_supported) {
4251                 const u8 *vht_oper_ie, *vht_cap;
4252
4253                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4254                                                    WLAN_EID_VHT_OPERATION);
4255                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4256                         vht_oper = (void *)(vht_oper_ie + 2);
4257                 if (vht_oper && !ht_oper) {
4258                         vht_oper = NULL;
4259                         sdata_info(sdata,
4260                                    "AP advertised VHT without HT, disabling both\n");
4261                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4262                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4263                 }
4264
4265                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4266                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4267                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4268                         vht_oper = NULL;
4269                 }
4270         }
4271
4272         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4273                                                      cbss->channel,
4274                                                      ht_cap, ht_oper, vht_oper,
4275                                                      &chandef, false);
4276
4277         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4278                                       local->rx_chains);
4279
4280         rcu_read_unlock();
4281
4282         /* will change later if needed */
4283         sdata->smps_mode = IEEE80211_SMPS_OFF;
4284
4285         mutex_lock(&local->mtx);
4286         /*
4287          * If this fails (possibly due to channel context sharing
4288          * on incompatible channels, e.g. 80+80 and 160 sharing the
4289          * same control channel) try to use a smaller bandwidth.
4290          */
4291         ret = ieee80211_vif_use_channel(sdata, &chandef,
4292                                         IEEE80211_CHANCTX_SHARED);
4293
4294         /* don't downgrade for 5 and 10 MHz channels, though. */
4295         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4296             chandef.width == NL80211_CHAN_WIDTH_10)
4297                 goto out;
4298
4299         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4300                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4301                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4302                                                 IEEE80211_CHANCTX_SHARED);
4303         }
4304  out:
4305         mutex_unlock(&local->mtx);
4306         return ret;
4307 }
4308
4309 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4310                                      struct cfg80211_bss *cbss, bool assoc)
4311 {
4312         struct ieee80211_local *local = sdata->local;
4313         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4314         struct ieee80211_bss *bss = (void *)cbss->priv;
4315         struct sta_info *new_sta = NULL;
4316         struct ieee80211_supported_band *sband;
4317         struct ieee80211_sta_ht_cap sta_ht_cap;
4318         bool have_sta = false, is_override = false;
4319         int err;
4320
4321         sband = local->hw.wiphy->bands[cbss->channel->band];
4322
4323         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4324                 return -EINVAL;
4325
4326         if (assoc) {
4327                 rcu_read_lock();
4328                 have_sta = sta_info_get(sdata, cbss->bssid);
4329                 rcu_read_unlock();
4330         }
4331
4332         if (!have_sta) {
4333                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4334                 if (!new_sta)
4335                         return -ENOMEM;
4336         }
4337
4338         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4339         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4340
4341         is_override = (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) !=
4342                       (sband->ht_cap.cap &
4343                        IEEE80211_HT_CAP_SUP_WIDTH_20_40);
4344
4345         if (new_sta || is_override) {
4346                 err = ieee80211_prep_channel(sdata, cbss);
4347                 if (err) {
4348                         if (new_sta)
4349                                 sta_info_free(local, new_sta);
4350                         return -EINVAL;
4351                 }
4352         }
4353
4354         if (new_sta) {
4355                 u32 rates = 0, basic_rates = 0;
4356                 bool have_higher_than_11mbit;
4357                 int min_rate = INT_MAX, min_rate_index = -1;
4358                 struct ieee80211_chanctx_conf *chanctx_conf;
4359                 const struct cfg80211_bss_ies *ies;
4360                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4361                 u32 rate_flags;
4362
4363                 rcu_read_lock();
4364                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4365                 if (WARN_ON(!chanctx_conf)) {
4366                         rcu_read_unlock();
4367                         sta_info_free(local, new_sta);
4368                         return -EINVAL;
4369                 }
4370                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4371                 rcu_read_unlock();
4372
4373                 ieee80211_get_rates(sband, bss->supp_rates,
4374                                     bss->supp_rates_len,
4375                                     &rates, &basic_rates,
4376                                     &have_higher_than_11mbit,
4377                                     &min_rate, &min_rate_index,
4378                                     shift, rate_flags);
4379
4380                 /*
4381                  * This used to be a workaround for basic rates missing
4382                  * in the association response frame. Now that we no
4383                  * longer use the basic rates from there, it probably
4384                  * doesn't happen any more, but keep the workaround so
4385                  * in case some *other* APs are buggy in different ways
4386                  * we can connect -- with a warning.
4387                  */
4388                 if (!basic_rates && min_rate_index >= 0) {
4389                         sdata_info(sdata,
4390                                    "No basic rates, using min rate instead\n");
4391                         basic_rates = BIT(min_rate_index);
4392                 }
4393
4394                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4395                 sdata->vif.bss_conf.basic_rates = basic_rates;
4396
4397                 /* cf. IEEE 802.11 9.2.12 */
4398                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4399                     have_higher_than_11mbit)
4400                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4401                 else
4402                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4403
4404                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4405
4406                 /* set timing information */
4407                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4408                 rcu_read_lock();
4409                 ies = rcu_dereference(cbss->beacon_ies);
4410                 if (ies) {
4411                         const u8 *tim_ie;
4412
4413                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4414                         sdata->vif.bss_conf.sync_device_ts =
4415                                 bss->device_ts_beacon;
4416                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4417                                                   ies->data, ies->len);
4418                         if (tim_ie && tim_ie[1] >= 2)
4419                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4420                         else
4421                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4422                 } else if (!(local->hw.flags &
4423                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4424                         ies = rcu_dereference(cbss->proberesp_ies);
4425                         /* must be non-NULL since beacon IEs were NULL */
4426                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4427                         sdata->vif.bss_conf.sync_device_ts =
4428                                 bss->device_ts_presp;
4429                         sdata->vif.bss_conf.sync_dtim_count = 0;
4430                 } else {
4431                         sdata->vif.bss_conf.sync_tsf = 0;
4432                         sdata->vif.bss_conf.sync_device_ts = 0;
4433                         sdata->vif.bss_conf.sync_dtim_count = 0;
4434                 }
4435                 rcu_read_unlock();
4436
4437                 /* tell driver about BSSID, basic rates and timing */
4438                 ieee80211_bss_info_change_notify(sdata,
4439                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4440                         BSS_CHANGED_BEACON_INT);
4441
4442                 if (assoc)
4443                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4444
4445                 err = sta_info_insert(new_sta);
4446                 new_sta = NULL;
4447                 if (err) {
4448                         sdata_info(sdata,
4449                                    "failed to insert STA entry for the AP (error %d)\n",
4450                                    err);
4451                         return err;
4452                 }
4453         } else
4454                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4455
4456         /* Cancel scan to ensure that nothing interferes with connection */
4457         if (local->scanning)
4458                 ieee80211_scan_cancel(local);
4459
4460         return 0;
4461 }
4462
4463 /* config hooks */
4464 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4465                        struct cfg80211_auth_request *req)
4466 {
4467         struct ieee80211_local *local = sdata->local;
4468         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4469         struct ieee80211_mgd_auth_data *auth_data;
4470         u16 auth_alg;
4471         int err;
4472
4473         /* prepare auth data structure */
4474
4475         switch (req->auth_type) {
4476         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4477                 auth_alg = WLAN_AUTH_OPEN;
4478                 break;
4479         case NL80211_AUTHTYPE_SHARED_KEY:
4480                 if (IS_ERR(local->wep_tx_tfm))
4481                         return -EOPNOTSUPP;
4482                 auth_alg = WLAN_AUTH_SHARED_KEY;
4483                 break;
4484         case NL80211_AUTHTYPE_FT:
4485                 auth_alg = WLAN_AUTH_FT;
4486                 break;
4487         case NL80211_AUTHTYPE_NETWORK_EAP:
4488                 auth_alg = WLAN_AUTH_LEAP;
4489                 break;
4490         case NL80211_AUTHTYPE_SAE:
4491                 auth_alg = WLAN_AUTH_SAE;
4492                 break;
4493         default:
4494                 return -EOPNOTSUPP;
4495         }
4496
4497         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4498                             req->ie_len, GFP_KERNEL);
4499         if (!auth_data)
4500                 return -ENOMEM;
4501
4502         auth_data->bss = req->bss;
4503
4504         if (req->sae_data_len >= 4) {
4505                 __le16 *pos = (__le16 *) req->sae_data;
4506                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4507                 auth_data->sae_status = le16_to_cpu(pos[1]);
4508                 memcpy(auth_data->data, req->sae_data + 4,
4509                        req->sae_data_len - 4);
4510                 auth_data->data_len += req->sae_data_len - 4;
4511         }
4512
4513         if (req->ie && req->ie_len) {
4514                 memcpy(&auth_data->data[auth_data->data_len],
4515                        req->ie, req->ie_len);
4516                 auth_data->data_len += req->ie_len;
4517         }
4518
4519         if (req->key && req->key_len) {
4520                 auth_data->key_len = req->key_len;
4521                 auth_data->key_idx = req->key_idx;
4522                 memcpy(auth_data->key, req->key, req->key_len);
4523         }
4524
4525         auth_data->algorithm = auth_alg;
4526
4527         /* try to authenticate/probe */
4528
4529         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4530             ifmgd->assoc_data) {
4531                 err = -EBUSY;
4532                 goto err_free;
4533         }
4534
4535         if (ifmgd->auth_data)
4536                 ieee80211_destroy_auth_data(sdata, false);
4537
4538         /* prep auth_data so we don't go into idle on disassoc */
4539         ifmgd->auth_data = auth_data;
4540
4541         if (ifmgd->associated) {
4542                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4543
4544                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4545                                        WLAN_REASON_UNSPECIFIED,
4546                                        false, frame_buf);
4547
4548                 ieee80211_report_disconnect(sdata, frame_buf,
4549                                             sizeof(frame_buf), true,
4550                                             WLAN_REASON_UNSPECIFIED);
4551         }
4552
4553         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4554
4555         err = ieee80211_prep_connection(sdata, req->bss, false);
4556         if (err)
4557                 goto err_clear;
4558
4559         err = ieee80211_probe_auth(sdata);
4560         if (err) {
4561                 sta_info_destroy_addr(sdata, req->bss->bssid);
4562                 goto err_clear;
4563         }
4564
4565         /* hold our own reference */
4566         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4567         return 0;
4568
4569  err_clear:
4570         eth_zero_addr(ifmgd->bssid);
4571         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4572         ifmgd->auth_data = NULL;
4573  err_free:
4574         kfree(auth_data);
4575         return err;
4576 }
4577
4578 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4579                                         const u8 *wmm_param, int len)
4580 {
4581         const u8 *pos;
4582         size_t left;
4583
4584         if (len < 8)
4585                 return false;
4586
4587         if (wmm_param[5] != 1 /* version */)
4588                 return false;
4589
4590         pos = wmm_param + 8;
4591         left = len - 8;
4592
4593         for (; left >= 4; left -= 4, pos += 4) {
4594                 u8 aifsn = pos[0] & 0x0f;
4595                 u8 ecwmin = pos[1] & 0x0f;
4596                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4597                 int aci = (pos[0] >> 5) & 0x03;
4598
4599                 if (aifsn < 2) {
4600                         sdata_info(sdata,
4601                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4602                                    aifsn, aci);
4603                         return false;
4604                 }
4605                 if (ecwmin > ecwmax) {
4606                         sdata_info(sdata,
4607                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4608                                    ecwmin, ecwmax, aci);
4609                         return false;
4610                 }
4611         }
4612
4613         return true;
4614 }
4615
4616 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4617                         struct cfg80211_assoc_request *req)
4618 {
4619         struct ieee80211_local *local = sdata->local;
4620         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4621         struct ieee80211_bss *bss = (void *)req->bss->priv;
4622         struct ieee80211_mgd_assoc_data *assoc_data;
4623         const struct cfg80211_bss_ies *beacon_ies;
4624         struct ieee80211_supported_band *sband;
4625         const u8 *ssidie, *ht_ie, *vht_ie;
4626         int i, err;
4627
4628         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4629         if (!assoc_data)
4630                 return -ENOMEM;
4631
4632         rcu_read_lock();
4633         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4634         if (!ssidie) {
4635                 rcu_read_unlock();
4636                 kfree(assoc_data);
4637                 return -EINVAL;
4638         }
4639         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4640         assoc_data->ssid_len = ssidie[1];
4641         rcu_read_unlock();
4642
4643         if (ifmgd->associated) {
4644                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4645
4646                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4647                                        WLAN_REASON_UNSPECIFIED,
4648                                        false, frame_buf);
4649
4650                 ieee80211_report_disconnect(sdata, frame_buf,
4651                                             sizeof(frame_buf), true,
4652                                             WLAN_REASON_UNSPECIFIED);
4653         }
4654
4655         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4656                 err = -EBUSY;
4657                 goto err_free;
4658         }
4659
4660         if (ifmgd->assoc_data) {
4661                 err = -EBUSY;
4662                 goto err_free;
4663         }
4664
4665         if (ifmgd->auth_data) {
4666                 bool match;
4667
4668                 /* keep sta info, bssid if matching */
4669                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4670                 ieee80211_destroy_auth_data(sdata, match);
4671         }
4672
4673         /* prepare assoc data */
4674
4675         ifmgd->beacon_crc_valid = false;
4676
4677         assoc_data->wmm = bss->wmm_used &&
4678                           (local->hw.queues >= IEEE80211_NUM_ACS);
4679         if (assoc_data->wmm) {
4680                 /* try to check validity of WMM params IE */
4681                 const struct cfg80211_bss_ies *ies;
4682                 const u8 *wp, *start, *end;
4683
4684                 rcu_read_lock();
4685                 ies = rcu_dereference(req->bss->ies);
4686                 start = ies->data;
4687                 end = start + ies->len;
4688
4689                 while (true) {
4690                         wp = cfg80211_find_vendor_ie(
4691                                 WLAN_OUI_MICROSOFT,
4692                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4693                                 start, end - start);
4694                         if (!wp)
4695                                 break;
4696                         start = wp + wp[1] + 2;
4697                         /* if this IE is too short, try the next */
4698                         if (wp[1] <= 4)
4699                                 continue;
4700                         /* if this IE is WMM params, we found what we wanted */
4701                         if (wp[6] == 1)
4702                                 break;
4703                 }
4704
4705                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4706                                                         wp[1] - 2)) {
4707                         assoc_data->wmm = false;
4708                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4709                 }
4710                 rcu_read_unlock();
4711         }
4712
4713         /*
4714          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4715          * We still associate in non-HT mode (11a/b/g) if any one of these
4716          * ciphers is configured as pairwise.
4717          * We can set this to true for non-11n hardware, that'll be checked
4718          * separately along with the peer capabilities.
4719          */
4720         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4721                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4722                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4723                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4724                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4725                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4726                         netdev_info(sdata->dev,
4727                                     "disabling HT/VHT due to WEP/TKIP use\n");
4728                 }
4729         }
4730
4731         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4732                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4733                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4734         }
4735
4736         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4737                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4738
4739         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4740         sband = local->hw.wiphy->bands[req->bss->channel->band];
4741         if (!sband->ht_cap.ht_supported ||
4742             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4743             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4744                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4745                 if (!bss->wmm_used &&
4746                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4747                         netdev_info(sdata->dev,
4748                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4749         }
4750
4751         /* disable VHT if we don't support it or the AP doesn't use WMM */
4752         if (!sband->vht_cap.vht_supported ||
4753             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4754             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4755                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4756                 if (!bss->wmm_used &&
4757                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4758                         netdev_info(sdata->dev,
4759                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4760         }
4761
4762         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4763         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4764                sizeof(ifmgd->ht_capa_mask));
4765
4766         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4767         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4768                sizeof(ifmgd->vht_capa_mask));
4769
4770         if (req->ie && req->ie_len) {
4771                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4772                 assoc_data->ie_len = req->ie_len;
4773         }
4774
4775         assoc_data->bss = req->bss;
4776
4777         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4778                 if (ifmgd->powersave)
4779                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4780                 else
4781                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4782         } else
4783                 sdata->smps_mode = ifmgd->req_smps;
4784
4785         assoc_data->capability = req->bss->capability;
4786         assoc_data->supp_rates = bss->supp_rates;
4787         assoc_data->supp_rates_len = bss->supp_rates_len;
4788
4789         rcu_read_lock();
4790         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4791         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4792                 assoc_data->ap_ht_param =
4793                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4794         else
4795                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4796         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4797         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4798                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4799                        sizeof(struct ieee80211_vht_cap));
4800         else
4801                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4802         rcu_read_unlock();
4803
4804         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4805                  (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
4806              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4807                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4808
4809         if (bss->wmm_used && bss->uapsd_supported &&
4810             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4811                 assoc_data->uapsd = true;
4812                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4813         } else {
4814                 assoc_data->uapsd = false;
4815                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4816         }
4817
4818         if (req->prev_bssid)
4819                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4820
4821         if (req->use_mfp) {
4822                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4823                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4824         } else {
4825                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4826                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4827         }
4828
4829         if (req->flags & ASSOC_REQ_USE_RRM)
4830                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4831         else
4832                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4833
4834         if (req->crypto.control_port)
4835                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4836         else
4837                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4838
4839         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4840         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4841         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4842                                                         sdata->vif.type);
4843
4844         /* kick off associate process */
4845
4846         ifmgd->assoc_data = assoc_data;
4847         ifmgd->dtim_period = 0;
4848         ifmgd->have_beacon = false;
4849
4850         err = ieee80211_prep_connection(sdata, req->bss, true);
4851         if (err)
4852                 goto err_clear;
4853
4854         rcu_read_lock();
4855         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4856
4857         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4858             !beacon_ies) {
4859                 /*
4860                  * Wait up to one beacon interval ...
4861                  * should this be more if we miss one?
4862                  */
4863                 sdata_info(sdata, "waiting for beacon from %pM\n",
4864                            ifmgd->bssid);
4865                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4866                 assoc_data->timeout_started = true;
4867                 assoc_data->need_beacon = true;
4868         } else if (beacon_ies) {
4869                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4870                                                     beacon_ies->data,
4871                                                     beacon_ies->len);
4872                 u8 dtim_count = 0;
4873
4874                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4875                         const struct ieee80211_tim_ie *tim;
4876                         tim = (void *)(tim_ie + 2);
4877                         ifmgd->dtim_period = tim->dtim_period;
4878                         dtim_count = tim->dtim_count;
4879                 }
4880                 ifmgd->have_beacon = true;
4881                 assoc_data->timeout = jiffies;
4882                 assoc_data->timeout_started = true;
4883
4884                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4885                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4886                         sdata->vif.bss_conf.sync_device_ts =
4887                                 bss->device_ts_beacon;
4888                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4889                 }
4890         } else {
4891                 assoc_data->timeout = jiffies;
4892                 assoc_data->timeout_started = true;
4893         }
4894         rcu_read_unlock();
4895
4896         run_again(sdata, assoc_data->timeout);
4897
4898         if (bss->corrupt_data) {
4899                 char *corrupt_type = "data";
4900                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4901                         if (bss->corrupt_data &
4902                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4903                                 corrupt_type = "beacon and probe response";
4904                         else
4905                                 corrupt_type = "beacon";
4906                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4907                         corrupt_type = "probe response";
4908                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4909                            corrupt_type);
4910         }
4911
4912         return 0;
4913  err_clear:
4914         eth_zero_addr(ifmgd->bssid);
4915         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4916         ifmgd->assoc_data = NULL;
4917  err_free:
4918         kfree(assoc_data);
4919         return err;
4920 }
4921
4922 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4923                          struct cfg80211_deauth_request *req)
4924 {
4925         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4926         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4927         bool tx = !req->local_state_change;
4928
4929         if (ifmgd->auth_data &&
4930             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4931                 sdata_info(sdata,
4932                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4933                            req->bssid, req->reason_code,
4934                            ieee80211_get_reason_code_string(req->reason_code));
4935
4936                 drv_mgd_prepare_tx(sdata->local, sdata);
4937                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4938                                                IEEE80211_STYPE_DEAUTH,
4939                                                req->reason_code, tx,
4940                                                frame_buf);
4941                 ieee80211_destroy_auth_data(sdata, false);
4942                 ieee80211_report_disconnect(sdata, frame_buf,
4943                                             sizeof(frame_buf), true,
4944                                             req->reason_code);
4945
4946                 return 0;
4947         }
4948
4949         if (ifmgd->associated &&
4950             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4951                 sdata_info(sdata,
4952                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4953                            req->bssid, req->reason_code,
4954                            ieee80211_get_reason_code_string(req->reason_code));
4955
4956                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4957                                        req->reason_code, tx, frame_buf);
4958                 ieee80211_report_disconnect(sdata, frame_buf,
4959                                             sizeof(frame_buf), true,
4960                                             req->reason_code);
4961                 return 0;
4962         }
4963
4964         return -ENOTCONN;
4965 }
4966
4967 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4968                            struct cfg80211_disassoc_request *req)
4969 {
4970         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4971         u8 bssid[ETH_ALEN];
4972         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4973
4974         /*
4975          * cfg80211 should catch this ... but it's racy since
4976          * we can receive a disassoc frame, process it, hand it
4977          * to cfg80211 while that's in a locked section already
4978          * trying to tell us that the user wants to disconnect.
4979          */
4980         if (ifmgd->associated != req->bss)
4981                 return -ENOLINK;
4982
4983         sdata_info(sdata,
4984                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4985                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4986
4987         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4988         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4989                                req->reason_code, !req->local_state_change,
4990                                frame_buf);
4991
4992         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
4993                                     req->reason_code);
4994
4995         return 0;
4996 }
4997
4998 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4999 {
5000         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5001
5002         /*
5003          * Make sure some work items will not run after this,
5004          * they will not do anything but might not have been
5005          * cancelled when disconnecting.
5006          */
5007         cancel_work_sync(&ifmgd->monitor_work);
5008         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5009         cancel_work_sync(&ifmgd->request_smps_work);
5010         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5011         cancel_work_sync(&ifmgd->chswitch_work);
5012         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5013
5014         sdata_lock(sdata);
5015         if (ifmgd->assoc_data) {
5016                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5017                 ieee80211_destroy_assoc_data(sdata, false);
5018                 cfg80211_assoc_timeout(sdata->dev, bss);
5019         }
5020         if (ifmgd->auth_data)
5021                 ieee80211_destroy_auth_data(sdata, false);
5022         spin_lock_bh(&ifmgd->teardown_lock);
5023         if (ifmgd->teardown_skb) {
5024                 kfree_skb(ifmgd->teardown_skb);
5025                 ifmgd->teardown_skb = NULL;
5026                 ifmgd->orig_teardown_skb = NULL;
5027         }
5028         spin_unlock_bh(&ifmgd->teardown_lock);
5029         del_timer_sync(&ifmgd->timer);
5030         sdata_unlock(sdata);
5031 }
5032
5033 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5034                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5035                                gfp_t gfp)
5036 {
5037         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5038
5039         trace_api_cqm_rssi_notify(sdata, rssi_event);
5040
5041         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5042 }
5043 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5044
5045 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5046 {
5047         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5048
5049         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5050
5051         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5052 }
5053 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);