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 (ieee80211_hw_check(&sdata->local->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 (ieee80211_hw_check(&sdata->local->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                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 673                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 674         }
 675
 676         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 677                 capab |= WLAN_CAPABILITY_PRIVACY;
 678
 679         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 680             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 681                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 682
 683         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 684                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 685
 686         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 687         memset(mgmt, 0, 24);
 688         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 689         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 690         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 691
 692         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 693                 skb_put(skb, 10);
 694                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 695                                                   IEEE80211_STYPE_REASSOC_REQ);
 696                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 697                 mgmt->u.reassoc_req.listen_interval =
 698                                 cpu_to_le16(local->hw.conf.listen_interval);
 699                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 700                        ETH_ALEN);
 701         } else {
 702                 skb_put(skb, 4);
 703                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 704                                                   IEEE80211_STYPE_ASSOC_REQ);
 705                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 706                 mgmt->u.assoc_req.listen_interval =
 707                                 cpu_to_le16(local->hw.conf.listen_interval);
 708         }
 709
 710         /* SSID */
 711         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 712         *pos++ = WLAN_EID_SSID;
 713         *pos++ = assoc_data->ssid_len;
 714         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 715
 716         /* add all rates which were marked to be used above */
 717         supp_rates_len = rates_len;
 718         if (supp_rates_len > 8)
 719                 supp_rates_len = 8;
 720
 721         pos = skb_put(skb, supp_rates_len + 2);
 722         *pos++ = WLAN_EID_SUPP_RATES;
 723         *pos++ = supp_rates_len;
 724
 725         count = 0;
 726         for (i = 0; i < sband->n_bitrates; i++) {
 727                 if (BIT(i) & rates) {
 728                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 729                                                 5 * (1 << shift));
 730                         *pos++ = (u8) rate;
 731                         if (++count == 8)
 732                                 break;
 733                 }
 734         }
 735
 736         if (rates_len > count) {
 737                 pos = skb_put(skb, rates_len - count + 2);
 738                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 739                 *pos++ = rates_len - count;
 740
 741                 for (i++; i < sband->n_bitrates; i++) {
 742                         if (BIT(i) & rates) {
 743                                 int rate;
 744                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 745                                                     5 * (1 << shift));
 746                                 *pos++ = (u8) rate;
 747                         }
 748                 }
 749         }
 750
 751         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 752             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 753                 pos = skb_put(skb, 4);
 754                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 755                 *pos++ = 2;
 756                 *pos++ = 0; /* min tx power */
 757                  /* max tx power */
 758                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 759         }
 760
 761         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 762                 /* TODO: get this in reg domain format */
 763                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 764                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 765                 *pos++ = 2 * sband->n_channels;
 766                 for (i = 0; i < sband->n_channels; i++) {
 767                         *pos++ = ieee80211_frequency_to_channel(
 768                                         sband->channels[i].center_freq);
 769                         *pos++ = 1; /* one channel in the subband*/
 770                 }
 771         }
 772
 773         /* if present, add any custom IEs that go before HT */
 774         if (assoc_data->ie_len) {
 775                 static const u8 before_ht[] = {
 776                         WLAN_EID_SSID,
 777                         WLAN_EID_SUPP_RATES,
 778                         WLAN_EID_EXT_SUPP_RATES,
 779                         WLAN_EID_PWR_CAPABILITY,
 780                         WLAN_EID_SUPPORTED_CHANNELS,
 781                         WLAN_EID_RSN,
 782                         WLAN_EID_QOS_CAPA,
 783                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 784                         WLAN_EID_MOBILITY_DOMAIN,
 785                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 786                         WLAN_EID_RIC_DATA,              /* reassoc only */
 787                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 788                 };
 789                 static const u8 after_ric[] = {
 790                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 791                         WLAN_EID_HT_CAPABILITY,
 792                         WLAN_EID_BSS_COEX_2040,
 793                         WLAN_EID_EXT_CAPABILITY,
 794                         WLAN_EID_QOS_TRAFFIC_CAPA,
 795                         WLAN_EID_TIM_BCAST_REQ,
 796                         WLAN_EID_INTERWORKING,
 797                         /* 60GHz doesn't happen right now */
 798                         WLAN_EID_VHT_CAPABILITY,
 799                         WLAN_EID_OPMODE_NOTIF,
 800                 };
 801
 802                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 803                                                  assoc_data->ie_len,
 804                                                  before_ht,
 805                                                  ARRAY_SIZE(before_ht),
 806                                                  after_ric,
 807                                                  ARRAY_SIZE(after_ric),
 808                                                  offset);
 809                 pos = skb_put(skb, noffset - offset);
 810                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 811                 offset = noffset;
 812         }
 813
 814         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 815                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 816                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 817
 818         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 819                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 820                                     sband, chan, sdata->smps_mode);
 821
 822         /* if present, add any custom IEs that go before VHT */
 823         if (assoc_data->ie_len) {
 824                 static const u8 before_vht[] = {
 825                         WLAN_EID_SSID,
 826                         WLAN_EID_SUPP_RATES,
 827                         WLAN_EID_EXT_SUPP_RATES,
 828                         WLAN_EID_PWR_CAPABILITY,
 829                         WLAN_EID_SUPPORTED_CHANNELS,
 830                         WLAN_EID_RSN,
 831                         WLAN_EID_QOS_CAPA,
 832                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 833                         WLAN_EID_MOBILITY_DOMAIN,
 834                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 835                         WLAN_EID_HT_CAPABILITY,
 836                         WLAN_EID_BSS_COEX_2040,
 837                         WLAN_EID_EXT_CAPABILITY,
 838                         WLAN_EID_QOS_TRAFFIC_CAPA,
 839                         WLAN_EID_TIM_BCAST_REQ,
 840                         WLAN_EID_INTERWORKING,
 841                 };
 842
 843                 /* RIC already taken above, so no need to handle here anymore */
 844                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 845                                              before_vht, ARRAY_SIZE(before_vht),
 846                                              offset);
 847                 pos = skb_put(skb, noffset - offset);
 848                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 849                 offset = noffset;
 850         }
 851
 852         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 853                 ieee80211_add_vht_ie(sdata, skb, sband,
 854                                      &assoc_data->ap_vht_cap);
 855
 856         /* if present, add any custom non-vendor IEs that go after HT */
 857         if (assoc_data->ie_len) {
 858                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 859                                                     assoc_data->ie_len,
 860                                                     offset);
 861                 pos = skb_put(skb, noffset - offset);
 862                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 863                 offset = noffset;
 864         }
 865
 866         if (assoc_data->wmm) {
 867                 if (assoc_data->uapsd) {
 868                         qos_info = ifmgd->uapsd_queues;
 869                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 870                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 871                 } else {
 872                         qos_info = 0;
 873                 }
 874
 875                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 876         }
 877
 878         /* add any remaining custom (i.e. vendor specific here) IEs */
 879         if (assoc_data->ie_len) {
 880                 noffset = assoc_data->ie_len;
 881                 pos = skb_put(skb, noffset - offset);
 882                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 883         }
 884
 885         drv_mgd_prepare_tx(local, sdata);
 886
 887         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 888         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 889                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 890                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 891         ieee80211_tx_skb(sdata, skb);
 892 }
 893
 894 void ieee80211_send_pspoll(struct ieee80211_local *local,
 895                            struct ieee80211_sub_if_data *sdata)
 896 {
 897         struct ieee80211_pspoll *pspoll;
 898         struct sk_buff *skb;
 899
 900         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 901         if (!skb)
 902                 return;
 903
 904         pspoll = (struct ieee80211_pspoll *) skb->data;
 905         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 906
 907         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 908         ieee80211_tx_skb(sdata, skb);
 909 }
 910
 911 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 912                              struct ieee80211_sub_if_data *sdata,
 913                              int powersave)
 914 {
 915         struct sk_buff *skb;
 916         struct ieee80211_hdr_3addr *nullfunc;
 917         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 918
 919         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 920         if (!skb)
 921                 return;
 922
 923         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 924         if (powersave)
 925                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 926
 927         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 928                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 929
 930         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 931                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 932
 933         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 934                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 935
 936         ieee80211_tx_skb(sdata, skb);
 937 }
 938
 939 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 940                                           struct ieee80211_sub_if_data *sdata)
 941 {
 942         struct sk_buff *skb;
 943         struct ieee80211_hdr *nullfunc;
 944         __le16 fc;
 945
 946         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 947                 return;
 948
 949         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 950         if (!skb)
 951                 return;
 952
 953         skb_reserve(skb, local->hw.extra_tx_headroom);
 954
 955         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 956         memset(nullfunc, 0, 30);
 957         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 958                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 959         nullfunc->frame_control = fc;
 960         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 961         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 962         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 963         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 964
 965         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 966         ieee80211_tx_skb(sdata, skb);
 967 }
 968
 969 /* spectrum management related things */
 970 static void ieee80211_chswitch_work(struct work_struct *work)
 971 {
 972         struct ieee80211_sub_if_data *sdata =
 973                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 974         struct ieee80211_local *local = sdata->local;
 975         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 976         int ret;
 977
 978         if (!ieee80211_sdata_running(sdata))
 979                 return;
 980
 981         sdata_lock(sdata);
 982         mutex_lock(&local->mtx);
 983         mutex_lock(&local->chanctx_mtx);
 984
 985         if (!ifmgd->associated)
 986                 goto out;
 987
 988         if (!sdata->vif.csa_active)
 989                 goto out;
 990
 991         /*
 992          * using reservation isn't immediate as it may be deferred until later
 993          * with multi-vif. once reservation is complete it will re-schedule the
 994          * work with no reserved_chanctx so verify chandef to check if it
 995          * completed successfully
 996          */
 997
 998         if (sdata->reserved_chanctx) {
 999                 /*
1000                  * with multi-vif csa driver may call ieee80211_csa_finish()
1001                  * many times while waiting for other interfaces to use their
1002                  * reservations
1003                  */
1004                 if (sdata->reserved_ready)
1005                         goto out;
1006
1007                 ret = ieee80211_vif_use_reserved_context(sdata);
1008                 if (ret) {
1009                         sdata_info(sdata,
1010                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1011                                    ret);
1012                         ieee80211_queue_work(&sdata->local->hw,
1013                                              &ifmgd->csa_connection_drop_work);
1014                         goto out;
1015                 }
1016
1017                 goto out;
1018         }
1019
1020         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1021                                         &sdata->csa_chandef)) {
1022                 sdata_info(sdata,
1023                            "failed to finalize channel switch, disconnecting\n");
1024                 ieee80211_queue_work(&sdata->local->hw,
1025                                      &ifmgd->csa_connection_drop_work);
1026                 goto out;
1027         }
1028
1029         /* XXX: shouldn't really modify cfg80211-owned data! */
1030         ifmgd->associated->channel = sdata->csa_chandef.chan;
1031
1032         ifmgd->csa_waiting_bcn = true;
1033
1034         ieee80211_sta_reset_beacon_monitor(sdata);
1035         ieee80211_sta_reset_conn_monitor(sdata);
1036
1037 out:
1038         mutex_unlock(&local->chanctx_mtx);
1039         mutex_unlock(&local->mtx);
1040         sdata_unlock(sdata);
1041 }
1042
1043 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1044 {
1045         struct ieee80211_local *local = sdata->local;
1046         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1047         int ret;
1048
1049         sdata_assert_lock(sdata);
1050
1051         WARN_ON(!sdata->vif.csa_active);
1052
1053         if (sdata->csa_block_tx) {
1054                 ieee80211_wake_vif_queues(local, sdata,
1055                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1056                 sdata->csa_block_tx = false;
1057         }
1058
1059         sdata->vif.csa_active = false;
1060         ifmgd->csa_waiting_bcn = false;
1061
1062         ret = drv_post_channel_switch(sdata);
1063         if (ret) {
1064                 sdata_info(sdata,
1065                            "driver post channel switch failed, disconnecting\n");
1066                 ieee80211_queue_work(&local->hw,
1067                                      &ifmgd->csa_connection_drop_work);
1068                 return;
1069         }
1070
1071         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1072 }
1073
1074 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1075 {
1076         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1077         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1078
1079         trace_api_chswitch_done(sdata, success);
1080         if (!success) {
1081                 sdata_info(sdata,
1082                            "driver channel switch failed, disconnecting\n");
1083                 ieee80211_queue_work(&sdata->local->hw,
1084                                      &ifmgd->csa_connection_drop_work);
1085         } else {
1086                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1087         }
1088 }
1089 EXPORT_SYMBOL(ieee80211_chswitch_done);
1090
1091 static void ieee80211_chswitch_timer(unsigned long data)
1092 {
1093         struct ieee80211_sub_if_data *sdata =
1094                 (struct ieee80211_sub_if_data *) data;
1095
1096         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1097 }
1098
1099 static void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1100 {
1101         struct sta_info *sta;
1102         u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1103
1104         rcu_read_lock();
1105         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1106                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1107                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1108                         continue;
1109
1110                 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1111                                             NL80211_TDLS_TEARDOWN, reason,
1112                                             GFP_ATOMIC);
1113         }
1114         rcu_read_unlock();
1115 }
1116
1117 static void
1118 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1119                                  u64 timestamp, u32 device_timestamp,
1120                                  struct ieee802_11_elems *elems,
1121                                  bool beacon)
1122 {
1123         struct ieee80211_local *local = sdata->local;
1124         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1125         struct cfg80211_bss *cbss = ifmgd->associated;
1126         struct ieee80211_chanctx_conf *conf;
1127         struct ieee80211_chanctx *chanctx;
1128         enum ieee80211_band current_band;
1129         struct ieee80211_csa_ie csa_ie;
1130         struct ieee80211_channel_switch ch_switch;
1131         int res;
1132
1133         sdata_assert_lock(sdata);
1134
1135         if (!cbss)
1136                 return;
1137
1138         if (local->scanning)
1139                 return;
1140
1141         /* disregard subsequent announcements if we are already processing */
1142         if (sdata->vif.csa_active)
1143                 return;
1144
1145         current_band = cbss->channel->band;
1146         memset(&csa_ie, 0, sizeof(csa_ie));
1147         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1148                                            ifmgd->flags,
1149                                            ifmgd->associated->bssid, &csa_ie);
1150         if (res < 0)
1151                 ieee80211_queue_work(&local->hw,
1152                                      &ifmgd->csa_connection_drop_work);
1153         if (res)
1154                 return;
1155
1156         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1157                                      IEEE80211_CHAN_DISABLED)) {
1158                 sdata_info(sdata,
1159                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1160                            ifmgd->associated->bssid,
1161                            csa_ie.chandef.chan->center_freq,
1162                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1163                            csa_ie.chandef.center_freq2);
1164                 ieee80211_queue_work(&local->hw,
1165                                      &ifmgd->csa_connection_drop_work);
1166                 return;
1167         }
1168
1169         if (cfg80211_chandef_identical(&csa_ie.chandef,
1170                                        &sdata->vif.bss_conf.chandef)) {
1171                 if (ifmgd->csa_ignored_same_chan)
1172                         return;
1173                 sdata_info(sdata,
1174                            "AP %pM tries to chanswitch to same channel, ignore\n",
1175                            ifmgd->associated->bssid);
1176                 ifmgd->csa_ignored_same_chan = true;
1177                 return;
1178         }
1179
1180         /*
1181          * Drop all TDLS peers - either we disconnect or move to a different
1182          * channel from this point on. There's no telling what our peer will do.
1183          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1184          * have an incompatible wider chandef.
1185          */
1186         ieee80211_teardown_tdls_peers(sdata);
1187
1188         mutex_lock(&local->mtx);
1189         mutex_lock(&local->chanctx_mtx);
1190         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1191                                          lockdep_is_held(&local->chanctx_mtx));
1192         if (!conf) {
1193                 sdata_info(sdata,
1194                            "no channel context assigned to vif?, disconnecting\n");
1195                 goto drop_connection;
1196         }
1197
1198         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1199
1200         if (local->use_chanctx &&
1201             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1202                 sdata_info(sdata,
1203                            "driver doesn't support chan-switch with channel contexts\n");
1204                 goto drop_connection;
1205         }
1206
1207         ch_switch.timestamp = timestamp;
1208         ch_switch.device_timestamp = device_timestamp;
1209         ch_switch.block_tx = csa_ie.mode;
1210         ch_switch.chandef = csa_ie.chandef;
1211         ch_switch.count = csa_ie.count;
1212
1213         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1214                 sdata_info(sdata,
1215                            "preparing for channel switch failed, disconnecting\n");
1216                 goto drop_connection;
1217         }
1218
1219         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1220                                             chanctx->mode, false);
1221         if (res) {
1222                 sdata_info(sdata,
1223                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1224                            res);
1225                 goto drop_connection;
1226         }
1227         mutex_unlock(&local->chanctx_mtx);
1228
1229         sdata->vif.csa_active = true;
1230         sdata->csa_chandef = csa_ie.chandef;
1231         sdata->csa_block_tx = csa_ie.mode;
1232         ifmgd->csa_ignored_same_chan = false;
1233
1234         if (sdata->csa_block_tx)
1235                 ieee80211_stop_vif_queues(local, sdata,
1236                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1237         mutex_unlock(&local->mtx);
1238
1239         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1240                                           csa_ie.count);
1241
1242         if (local->ops->channel_switch) {
1243                 /* use driver's channel switch callback */
1244                 drv_channel_switch(local, sdata, &ch_switch);
1245                 return;
1246         }
1247
1248         /* channel switch handled in software */
1249         if (csa_ie.count <= 1)
1250                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1251         else
1252                 mod_timer(&ifmgd->chswitch_timer,
1253                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1254                                          cbss->beacon_interval));
1255         return;
1256  drop_connection:
1257         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1258         mutex_unlock(&local->chanctx_mtx);
1259         mutex_unlock(&local->mtx);
1260 }
1261
1262 static bool
1263 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1264                                  struct ieee80211_channel *channel,
1265                                  const u8 *country_ie, u8 country_ie_len,
1266                                  const u8 *pwr_constr_elem,
1267                                  int *chan_pwr, int *pwr_reduction)
1268 {
1269         struct ieee80211_country_ie_triplet *triplet;
1270         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1271         int i, chan_increment;
1272         bool have_chan_pwr = false;
1273
1274         /* Invalid IE */
1275         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1276                 return false;
1277
1278         triplet = (void *)(country_ie + 3);
1279         country_ie_len -= 3;
1280
1281         switch (channel->band) {
1282         default:
1283                 WARN_ON_ONCE(1);
1284                 /* fall through */
1285         case IEEE80211_BAND_2GHZ:
1286         case IEEE80211_BAND_60GHZ:
1287                 chan_increment = 1;
1288                 break;
1289         case IEEE80211_BAND_5GHZ:
1290                 chan_increment = 4;
1291                 break;
1292         }
1293
1294         /* find channel */
1295         while (country_ie_len >= 3) {
1296                 u8 first_channel = triplet->chans.first_channel;
1297
1298                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1299                         goto next;
1300
1301                 for (i = 0; i < triplet->chans.num_channels; i++) {
1302                         if (first_channel + i * chan_increment == chan) {
1303                                 have_chan_pwr = true;
1304                                 *chan_pwr = triplet->chans.max_power;
1305                                 break;
1306                         }
1307                 }
1308                 if (have_chan_pwr)
1309                         break;
1310
1311  next:
1312                 triplet++;
1313                 country_ie_len -= 3;
1314         }
1315
1316         if (have_chan_pwr && pwr_constr_elem)
1317                 *pwr_reduction = *pwr_constr_elem;
1318         else
1319                 *pwr_reduction = 0;
1320
1321         return have_chan_pwr;
1322 }
1323
1324 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1325                                       struct ieee80211_channel *channel,
1326                                       const u8 *cisco_dtpc_ie,
1327                                       int *pwr_level)
1328 {
1329         /* From practical testing, the first data byte of the DTPC element
1330          * seems to contain the requested dBm level, and the CLI on Cisco
1331          * APs clearly state the range is -127 to 127 dBm, which indicates
1332          * a signed byte, although it seemingly never actually goes negative.
1333          * The other byte seems to always be zero.
1334          */
1335         *pwr_level = (__s8)cisco_dtpc_ie[4];
1336 }
1337
1338 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1339                                        struct ieee80211_channel *channel,
1340                                        struct ieee80211_mgmt *mgmt,
1341                                        const u8 *country_ie, u8 country_ie_len,
1342                                        const u8 *pwr_constr_ie,
1343                                        const u8 *cisco_dtpc_ie)
1344 {
1345         bool has_80211h_pwr = false, has_cisco_pwr = false;
1346         int chan_pwr = 0, pwr_reduction_80211h = 0;
1347         int pwr_level_cisco, pwr_level_80211h;
1348         int new_ap_level;
1349         __le16 capab = mgmt->u.probe_resp.capab_info;
1350
1351         if (country_ie &&
1352             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1353              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1354                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1355                         sdata, channel, country_ie, country_ie_len,
1356                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1357                 pwr_level_80211h =
1358                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1359         }
1360
1361         if (cisco_dtpc_ie) {
1362                 ieee80211_find_cisco_dtpc(
1363                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1364                 has_cisco_pwr = true;
1365         }
1366
1367         if (!has_80211h_pwr && !has_cisco_pwr)
1368                 return 0;
1369
1370         /* If we have both 802.11h and Cisco DTPC, apply both limits
1371          * by picking the smallest of the two power levels advertised.
1372          */
1373         if (has_80211h_pwr &&
1374             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1375                 sdata_dbg(sdata,
1376                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1377                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1378                           sdata->u.mgd.bssid);
1379                 new_ap_level = pwr_level_80211h;
1380         } else {  /* has_cisco_pwr is always true here. */
1381                 sdata_dbg(sdata,
1382                           "Limiting TX power to %d dBm as advertised by %pM\n",
1383                           pwr_level_cisco, sdata->u.mgd.bssid);
1384                 new_ap_level = pwr_level_cisco;
1385         }
1386
1387         if (sdata->ap_power_level == new_ap_level)
1388                 return 0;
1389
1390         sdata->ap_power_level = new_ap_level;
1391         if (__ieee80211_recalc_txpower(sdata))
1392                 return BSS_CHANGED_TXPOWER;
1393         return 0;
1394 }
1395
1396 /* powersave */
1397 static void ieee80211_enable_ps(struct ieee80211_local *local,
1398                                 struct ieee80211_sub_if_data *sdata)
1399 {
1400         struct ieee80211_conf *conf = &local->hw.conf;
1401
1402         /*
1403          * If we are scanning right now then the parameters will
1404          * take effect when scan finishes.
1405          */
1406         if (local->scanning)
1407                 return;
1408
1409         if (conf->dynamic_ps_timeout > 0 &&
1410             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1411                 mod_timer(&local->dynamic_ps_timer, jiffies +
1412                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1413         } else {
1414                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1415                         ieee80211_send_nullfunc(local, sdata, 1);
1416
1417                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1418                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1419                         return;
1420
1421                 conf->flags |= IEEE80211_CONF_PS;
1422                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1423         }
1424 }
1425
1426 static void ieee80211_change_ps(struct ieee80211_local *local)
1427 {
1428         struct ieee80211_conf *conf = &local->hw.conf;
1429
1430         if (local->ps_sdata) {
1431                 ieee80211_enable_ps(local, local->ps_sdata);
1432         } else if (conf->flags & IEEE80211_CONF_PS) {
1433                 conf->flags &= ~IEEE80211_CONF_PS;
1434                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1435                 del_timer_sync(&local->dynamic_ps_timer);
1436                 cancel_work_sync(&local->dynamic_ps_enable_work);
1437         }
1438 }
1439
1440 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1441 {
1442         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1443         struct sta_info *sta = NULL;
1444         bool authorized = false;
1445
1446         if (!mgd->powersave)
1447                 return false;
1448
1449         if (mgd->broken_ap)
1450                 return false;
1451
1452         if (!mgd->associated)
1453                 return false;
1454
1455         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1456                 return false;
1457
1458         if (!mgd->have_beacon)
1459                 return false;
1460
1461         rcu_read_lock();
1462         sta = sta_info_get(sdata, mgd->bssid);
1463         if (sta)
1464                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1465         rcu_read_unlock();
1466
1467         return authorized;
1468 }
1469
1470 /* need to hold RTNL or interface lock */
1471 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1472 {
1473         struct ieee80211_sub_if_data *sdata, *found = NULL;
1474         int count = 0;
1475         int timeout;
1476
1477         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1478                 local->ps_sdata = NULL;
1479                 return;
1480         }
1481
1482         list_for_each_entry(sdata, &local->interfaces, list) {
1483                 if (!ieee80211_sdata_running(sdata))
1484                         continue;
1485                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1486                         /* If an AP vif is found, then disable PS
1487                          * by setting the count to zero thereby setting
1488                          * ps_sdata to NULL.
1489                          */
1490                         count = 0;
1491                         break;
1492                 }
1493                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1494                         continue;
1495                 found = sdata;
1496                 count++;
1497         }
1498
1499         if (count == 1 && ieee80211_powersave_allowed(found)) {
1500                 s32 beaconint_us;
1501
1502                 if (latency < 0)
1503                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1504
1505                 beaconint_us = ieee80211_tu_to_usec(
1506                                         found->vif.bss_conf.beacon_int);
1507
1508                 timeout = local->dynamic_ps_forced_timeout;
1509                 if (timeout < 0) {
1510                         /*
1511                          * Go to full PSM if the user configures a very low
1512                          * latency requirement.
1513                          * The 2000 second value is there for compatibility
1514                          * until the PM_QOS_NETWORK_LATENCY is configured
1515                          * with real values.
1516                          */
1517                         if (latency > (1900 * USEC_PER_MSEC) &&
1518                             latency != (2000 * USEC_PER_SEC))
1519                                 timeout = 0;
1520                         else
1521                                 timeout = 100;
1522                 }
1523                 local->hw.conf.dynamic_ps_timeout = timeout;
1524
1525                 if (beaconint_us > latency) {
1526                         local->ps_sdata = NULL;
1527                 } else {
1528                         int maxslp = 1;
1529                         u8 dtimper = found->u.mgd.dtim_period;
1530
1531                         /* If the TIM IE is invalid, pretend the value is 1 */
1532                         if (!dtimper)
1533                                 dtimper = 1;
1534                         else if (dtimper > 1)
1535                                 maxslp = min_t(int, dtimper,
1536                                                     latency / beaconint_us);
1537
1538                         local->hw.conf.max_sleep_period = maxslp;
1539                         local->hw.conf.ps_dtim_period = dtimper;
1540                         local->ps_sdata = found;
1541                 }
1542         } else {
1543                 local->ps_sdata = NULL;
1544         }
1545
1546         ieee80211_change_ps(local);
1547 }
1548
1549 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1550 {
1551         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1552
1553         if (sdata->vif.bss_conf.ps != ps_allowed) {
1554                 sdata->vif.bss_conf.ps = ps_allowed;
1555                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1556         }
1557 }
1558
1559 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1560 {
1561         struct ieee80211_local *local =
1562                 container_of(work, struct ieee80211_local,
1563                              dynamic_ps_disable_work);
1564
1565         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1566                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1567                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1568         }
1569
1570         ieee80211_wake_queues_by_reason(&local->hw,
1571                                         IEEE80211_MAX_QUEUE_MAP,
1572                                         IEEE80211_QUEUE_STOP_REASON_PS,
1573                                         false);
1574 }
1575
1576 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1577 {
1578         struct ieee80211_local *local =
1579                 container_of(work, struct ieee80211_local,
1580                              dynamic_ps_enable_work);
1581         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1582         struct ieee80211_if_managed *ifmgd;
1583         unsigned long flags;
1584         int q;
1585
1586         /* can only happen when PS was just disabled anyway */
1587         if (!sdata)
1588                 return;
1589
1590         ifmgd = &sdata->u.mgd;
1591
1592         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1593                 return;
1594
1595         if (local->hw.conf.dynamic_ps_timeout > 0) {
1596                 /* don't enter PS if TX frames are pending */
1597                 if (drv_tx_frames_pending(local)) {
1598                         mod_timer(&local->dynamic_ps_timer, jiffies +
1599                                   msecs_to_jiffies(
1600                                   local->hw.conf.dynamic_ps_timeout));
1601                         return;
1602                 }
1603
1604                 /*
1605                  * transmission can be stopped by others which leads to
1606                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1607                  * is not the actual idle state.
1608                  */
1609                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1610                 for (q = 0; q < local->hw.queues; q++) {
1611                         if (local->queue_stop_reasons[q]) {
1612                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1613                                                        flags);
1614                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1615                                           msecs_to_jiffies(
1616                                           local->hw.conf.dynamic_ps_timeout));
1617                                 return;
1618                         }
1619                 }
1620                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1621         }
1622
1623         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1624             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1625                 if (drv_tx_frames_pending(local)) {
1626                         mod_timer(&local->dynamic_ps_timer, jiffies +
1627                                   msecs_to_jiffies(
1628                                   local->hw.conf.dynamic_ps_timeout));
1629                 } else {
1630                         ieee80211_send_nullfunc(local, sdata, 1);
1631                         /* Flush to get the tx status of nullfunc frame */
1632                         ieee80211_flush_queues(local, sdata, false);
1633                 }
1634         }
1635
1636         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1637               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1638             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1639                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1640                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1641                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1642         }
1643 }
1644
1645 void ieee80211_dynamic_ps_timer(unsigned long data)
1646 {
1647         struct ieee80211_local *local = (void *) data;
1648
1649         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1650 }
1651
1652 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1653 {
1654         struct delayed_work *delayed_work =
1655                 container_of(work, struct delayed_work, work);
1656         struct ieee80211_sub_if_data *sdata =
1657                 container_of(delayed_work, struct ieee80211_sub_if_data,
1658                              dfs_cac_timer_work);
1659         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1660
1661         mutex_lock(&sdata->local->mtx);
1662         if (sdata->wdev.cac_started) {
1663                 ieee80211_vif_release_channel(sdata);
1664                 cfg80211_cac_event(sdata->dev, &chandef,
1665                                    NL80211_RADAR_CAC_FINISHED,
1666                                    GFP_KERNEL);
1667         }
1668         mutex_unlock(&sdata->local->mtx);
1669 }
1670
1671 static bool
1672 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1673 {
1674         struct ieee80211_local *local = sdata->local;
1675         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1676         bool ret = false;
1677         int ac;
1678
1679         if (local->hw.queues < IEEE80211_NUM_ACS)
1680                 return false;
1681
1682         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1683                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1684                 int non_acm_ac;
1685                 unsigned long now = jiffies;
1686
1687                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1688                     tx_tspec->admitted_time &&
1689                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1690                         tx_tspec->consumed_tx_time = 0;
1691                         tx_tspec->time_slice_start = now;
1692
1693                         if (tx_tspec->downgraded)
1694                                 tx_tspec->action =
1695                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1696                 }
1697
1698                 switch (tx_tspec->action) {
1699                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1700                         /* take the original parameters */
1701                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1702                                 sdata_err(sdata,
1703                                           "failed to set TX queue parameters for queue %d\n",
1704                                           ac);
1705                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1706                         tx_tspec->downgraded = false;
1707                         ret = true;
1708                         break;
1709                 case TX_TSPEC_ACTION_DOWNGRADE:
1710                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1711                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1712                                 ret = true;
1713                                 break;
1714                         }
1715                         /* downgrade next lower non-ACM AC */
1716                         for (non_acm_ac = ac + 1;
1717                              non_acm_ac < IEEE80211_NUM_ACS;
1718                              non_acm_ac++)
1719                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1720                                         break;
1721                         /* The loop will result in using BK even if it requires
1722                          * admission control, such configuration makes no sense
1723                          * and we have to transmit somehow - the AC selection
1724                          * does the same thing.
1725                          */
1726                         if (drv_conf_tx(local, sdata, ac,
1727                                         &sdata->tx_conf[non_acm_ac]))
1728                                 sdata_err(sdata,
1729                                           "failed to set TX queue parameters for queue %d\n",
1730                                           ac);
1731                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1732                         ret = true;
1733                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1734                                 tx_tspec->time_slice_start + HZ - now + 1);
1735                         break;
1736                 case TX_TSPEC_ACTION_NONE:
1737                         /* nothing now */
1738                         break;
1739                 }
1740         }
1741
1742         return ret;
1743 }
1744
1745 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1746 {
1747         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1748                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1749 }
1750
1751 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1752 {
1753         struct ieee80211_sub_if_data *sdata;
1754
1755         sdata = container_of(work, struct ieee80211_sub_if_data,
1756                              u.mgd.tx_tspec_wk.work);
1757         ieee80211_sta_handle_tspec_ac_params(sdata);
1758 }
1759
1760 /* MLME */
1761 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1762                                      struct ieee80211_sub_if_data *sdata,
1763                                      const u8 *wmm_param, size_t wmm_param_len)
1764 {
1765         struct ieee80211_tx_queue_params params;
1766         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1767         size_t left;
1768         int count;
1769         const u8 *pos;
1770         u8 uapsd_queues = 0;
1771
1772         if (!local->ops->conf_tx)
1773                 return false;
1774
1775         if (local->hw.queues < IEEE80211_NUM_ACS)
1776                 return false;
1777
1778         if (!wmm_param)
1779                 return false;
1780
1781         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1782                 return false;
1783
1784         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1785                 uapsd_queues = ifmgd->uapsd_queues;
1786
1787         count = wmm_param[6] & 0x0f;
1788         if (count == ifmgd->wmm_last_param_set)
1789                 return false;
1790         ifmgd->wmm_last_param_set = count;
1791
1792         pos = wmm_param + 8;
1793         left = wmm_param_len - 8;
1794
1795         memset(&params, 0, sizeof(params));
1796
1797         sdata->wmm_acm = 0;
1798         for (; left >= 4; left -= 4, pos += 4) {
1799                 int aci = (pos[0] >> 5) & 0x03;
1800                 int acm = (pos[0] >> 4) & 0x01;
1801                 bool uapsd = false;
1802                 int queue;
1803
1804                 switch (aci) {
1805                 case 1: /* AC_BK */
1806                         queue = 3;
1807                         if (acm)
1808                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1809                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1810                                 uapsd = true;
1811                         break;
1812                 case 2: /* AC_VI */
1813                         queue = 1;
1814                         if (acm)
1815                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1816                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1817                                 uapsd = true;
1818                         break;
1819                 case 3: /* AC_VO */
1820                         queue = 0;
1821                         if (acm)
1822                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1823                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1824                                 uapsd = true;
1825                         break;
1826                 case 0: /* AC_BE */
1827                 default:
1828                         queue = 2;
1829                         if (acm)
1830                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1831                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1832                                 uapsd = true;
1833                         break;
1834                 }
1835
1836                 params.aifs = pos[0] & 0x0f;
1837                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1838                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1839                 params.txop = get_unaligned_le16(pos + 2);
1840                 params.acm = acm;
1841                 params.uapsd = uapsd;
1842
1843                 mlme_dbg(sdata,
1844                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1845                          queue, aci, acm,
1846                          params.aifs, params.cw_min, params.cw_max,
1847                          params.txop, params.uapsd,
1848                          ifmgd->tx_tspec[queue].downgraded);
1849                 sdata->tx_conf[queue] = params;
1850                 if (!ifmgd->tx_tspec[queue].downgraded &&
1851                     drv_conf_tx(local, sdata, queue, &params))
1852                         sdata_err(sdata,
1853                                   "failed to set TX queue parameters for queue %d\n",
1854                                   queue);
1855         }
1856
1857         /* enable WMM or activate new settings */
1858         sdata->vif.bss_conf.qos = true;
1859         return true;
1860 }
1861
1862 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1863 {
1864         lockdep_assert_held(&sdata->local->mtx);
1865
1866         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1867         ieee80211_run_deferred_scan(sdata->local);
1868 }
1869
1870 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1871 {
1872         mutex_lock(&sdata->local->mtx);
1873         __ieee80211_stop_poll(sdata);
1874         mutex_unlock(&sdata->local->mtx);
1875 }
1876
1877 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1878                                            u16 capab, bool erp_valid, u8 erp)
1879 {
1880         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1881         u32 changed = 0;
1882         bool use_protection;
1883         bool use_short_preamble;
1884         bool use_short_slot;
1885
1886         if (erp_valid) {
1887                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1888                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1889         } else {
1890                 use_protection = false;
1891                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1892         }
1893
1894         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1895         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1896                 use_short_slot = true;
1897
1898         if (use_protection != bss_conf->use_cts_prot) {
1899                 bss_conf->use_cts_prot = use_protection;
1900                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1901         }
1902
1903         if (use_short_preamble != bss_conf->use_short_preamble) {
1904                 bss_conf->use_short_preamble = use_short_preamble;
1905                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1906         }
1907
1908         if (use_short_slot != bss_conf->use_short_slot) {
1909                 bss_conf->use_short_slot = use_short_slot;
1910                 changed |= BSS_CHANGED_ERP_SLOT;
1911         }
1912
1913         return changed;
1914 }
1915
1916 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1917                                      struct cfg80211_bss *cbss,
1918                                      u32 bss_info_changed)
1919 {
1920         struct ieee80211_bss *bss = (void *)cbss->priv;
1921         struct ieee80211_local *local = sdata->local;
1922         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1923
1924         bss_info_changed |= BSS_CHANGED_ASSOC;
1925         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1926                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1927
1928         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1929                 beacon_loss_count * bss_conf->beacon_int));
1930
1931         sdata->u.mgd.associated = cbss;
1932         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1933
1934         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1935
1936         if (sdata->vif.p2p) {
1937                 const struct cfg80211_bss_ies *ies;
1938
1939                 rcu_read_lock();
1940                 ies = rcu_dereference(cbss->ies);
1941                 if (ies) {
1942                         int ret;
1943
1944                         ret = cfg80211_get_p2p_attr(
1945                                         ies->data, ies->len,
1946                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1947                                         (u8 *) &bss_conf->p2p_noa_attr,
1948                                         sizeof(bss_conf->p2p_noa_attr));
1949                         if (ret >= 2) {
1950                                 sdata->u.mgd.p2p_noa_index =
1951                                         bss_conf->p2p_noa_attr.index;
1952                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1953                         }
1954                 }
1955                 rcu_read_unlock();
1956         }
1957
1958         /* just to be sure */
1959         ieee80211_stop_poll(sdata);
1960
1961         ieee80211_led_assoc(local, 1);
1962
1963         if (sdata->u.mgd.have_beacon) {
1964                 /*
1965                  * If the AP is buggy we may get here with no DTIM period
1966                  * known, so assume it's 1 which is the only safe assumption
1967                  * in that case, although if the TIM IE is broken powersave
1968                  * probably just won't work at all.
1969                  */
1970                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1971                 bss_conf->beacon_rate = bss->beacon_rate;
1972                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1973         } else {
1974                 bss_conf->beacon_rate = NULL;
1975                 bss_conf->dtim_period = 0;
1976         }
1977
1978         bss_conf->assoc = 1;
1979
1980         /* Tell the driver to monitor connection quality (if supported) */
1981         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1982             bss_conf->cqm_rssi_thold)
1983                 bss_info_changed |= BSS_CHANGED_CQM;
1984
1985         /* Enable ARP filtering */
1986         if (bss_conf->arp_addr_cnt)
1987                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1988
1989         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1990
1991         mutex_lock(&local->iflist_mtx);
1992         ieee80211_recalc_ps(local, -1);
1993         mutex_unlock(&local->iflist_mtx);
1994
1995         ieee80211_recalc_smps(sdata);
1996         ieee80211_recalc_ps_vif(sdata);
1997
1998         netif_carrier_on(sdata->dev);
1999 }
2000
2001 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2002                                    u16 stype, u16 reason, bool tx,
2003                                    u8 *frame_buf)
2004 {
2005         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2006         struct ieee80211_local *local = sdata->local;
2007         u32 changed = 0;
2008
2009         sdata_assert_lock(sdata);
2010
2011         if (WARN_ON_ONCE(tx && !frame_buf))
2012                 return;
2013
2014         if (WARN_ON(!ifmgd->associated))
2015                 return;
2016
2017         ieee80211_stop_poll(sdata);
2018
2019         ifmgd->associated = NULL;
2020         netif_carrier_off(sdata->dev);
2021
2022         /*
2023          * if we want to get out of ps before disassoc (why?) we have
2024          * to do it before sending disassoc, as otherwise the null-packet
2025          * won't be valid.
2026          */
2027         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2028                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2029                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2030         }
2031         local->ps_sdata = NULL;
2032
2033         /* disable per-vif ps */
2034         ieee80211_recalc_ps_vif(sdata);
2035
2036         /* make sure ongoing transmission finishes */
2037         synchronize_net();
2038
2039         /*
2040          * drop any frame before deauth/disassoc, this can be data or
2041          * management frame. Since we are disconnecting, we should not
2042          * insist sending these frames which can take time and delay
2043          * the disconnection and possible the roaming.
2044          */
2045         if (tx)
2046                 ieee80211_flush_queues(local, sdata, true);
2047
2048         /* deauthenticate/disassociate now */
2049         if (tx || frame_buf)
2050                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2051                                                reason, tx, frame_buf);
2052
2053         /* flush out frame - make sure the deauth was actually sent */
2054         if (tx)
2055                 ieee80211_flush_queues(local, sdata, false);
2056
2057         /* clear bssid only after building the needed mgmt frames */
2058         eth_zero_addr(ifmgd->bssid);
2059
2060         /* remove AP and TDLS peers */
2061         sta_info_flush(sdata);
2062
2063         /* finally reset all BSS / config parameters */
2064         changed |= ieee80211_reset_erp_info(sdata);
2065
2066         ieee80211_led_assoc(local, 0);
2067         changed |= BSS_CHANGED_ASSOC;
2068         sdata->vif.bss_conf.assoc = false;
2069
2070         ifmgd->p2p_noa_index = -1;
2071         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2072                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2073
2074         /* on the next assoc, re-program HT/VHT parameters */
2075         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2076         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2077         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2078         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2079
2080         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2081
2082         del_timer_sync(&local->dynamic_ps_timer);
2083         cancel_work_sync(&local->dynamic_ps_enable_work);
2084
2085         /* Disable ARP filtering */
2086         if (sdata->vif.bss_conf.arp_addr_cnt)
2087                 changed |= BSS_CHANGED_ARP_FILTER;
2088
2089         sdata->vif.bss_conf.qos = false;
2090         changed |= BSS_CHANGED_QOS;
2091
2092         /* The BSSID (not really interesting) and HT changed */
2093         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2094         ieee80211_bss_info_change_notify(sdata, changed);
2095
2096         /* disassociated - set to defaults now */
2097         ieee80211_set_wmm_default(sdata, false);
2098
2099         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2100         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2101         del_timer_sync(&sdata->u.mgd.timer);
2102         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2103
2104         sdata->vif.bss_conf.dtim_period = 0;
2105         sdata->vif.bss_conf.beacon_rate = NULL;
2106
2107         ifmgd->have_beacon = false;
2108
2109         ifmgd->flags = 0;
2110         mutex_lock(&local->mtx);
2111         ieee80211_vif_release_channel(sdata);
2112
2113         sdata->vif.csa_active = false;
2114         ifmgd->csa_waiting_bcn = false;
2115         ifmgd->csa_ignored_same_chan = false;
2116         if (sdata->csa_block_tx) {
2117                 ieee80211_wake_vif_queues(local, sdata,
2118                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2119                 sdata->csa_block_tx = false;
2120         }
2121         mutex_unlock(&local->mtx);
2122
2123         /* existing TX TSPEC sessions no longer exist */
2124         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2125         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2126
2127         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2128 }
2129
2130 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2131                              struct ieee80211_hdr *hdr)
2132 {
2133         /*
2134          * We can postpone the mgd.timer whenever receiving unicast frames
2135          * from AP because we know that the connection is working both ways
2136          * at that time. But multicast frames (and hence also beacons) must
2137          * be ignored here, because we need to trigger the timer during
2138          * data idle periods for sending the periodic probe request to the
2139          * AP we're connected to.
2140          */
2141         if (is_multicast_ether_addr(hdr->addr1))
2142                 return;
2143
2144         ieee80211_sta_reset_conn_monitor(sdata);
2145 }
2146
2147 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2148 {
2149         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2150         struct ieee80211_local *local = sdata->local;
2151
2152         mutex_lock(&local->mtx);
2153         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2154                 goto out;
2155
2156         __ieee80211_stop_poll(sdata);
2157
2158         mutex_lock(&local->iflist_mtx);
2159         ieee80211_recalc_ps(local, -1);
2160         mutex_unlock(&local->iflist_mtx);
2161
2162         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2163                 goto out;
2164
2165         /*
2166          * We've received a probe response, but are not sure whether
2167          * we have or will be receiving any beacons or data, so let's
2168          * schedule the timers again, just in case.
2169          */
2170         ieee80211_sta_reset_beacon_monitor(sdata);
2171
2172         mod_timer(&ifmgd->conn_mon_timer,
2173                   round_jiffies_up(jiffies +
2174                                    IEEE80211_CONNECTION_IDLE_TIME));
2175 out:
2176         mutex_unlock(&local->mtx);
2177 }
2178
2179 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2180                                            struct ieee80211_hdr *hdr,
2181                                            u16 tx_time)
2182 {
2183         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2184         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2185         int ac = ieee80211_ac_from_tid(tid);
2186         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2187         unsigned long now = jiffies;
2188
2189         if (likely(!tx_tspec->admitted_time))
2190                 return;
2191
2192         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2193                 tx_tspec->consumed_tx_time = 0;
2194                 tx_tspec->time_slice_start = now;
2195
2196                 if (tx_tspec->downgraded) {
2197                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2198                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2199                 }
2200         }
2201
2202         if (tx_tspec->downgraded)
2203                 return;
2204
2205         tx_tspec->consumed_tx_time += tx_time;
2206
2207         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2208                 tx_tspec->downgraded = true;
2209                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2210                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2211         }
2212 }
2213
2214 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2215                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2216 {
2217         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2218
2219         if (!ieee80211_is_data(hdr->frame_control))
2220             return;
2221
2222         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2223             sdata->u.mgd.probe_send_count > 0) {
2224                 if (ack)
2225                         ieee80211_sta_reset_conn_monitor(sdata);
2226                 else
2227                         sdata->u.mgd.nullfunc_failed = true;
2228                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2229                 return;
2230         }
2231
2232         if (ack)
2233                 ieee80211_sta_reset_conn_monitor(sdata);
2234 }
2235
2236 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2237 {
2238         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2239         const u8 *ssid;
2240         u8 *dst = ifmgd->associated->bssid;
2241         u8 unicast_limit = max(1, max_probe_tries - 3);
2242
2243         /*
2244          * Try sending broadcast probe requests for the last three
2245          * probe requests after the first ones failed since some
2246          * buggy APs only support broadcast probe requests.
2247          */
2248         if (ifmgd->probe_send_count >= unicast_limit)
2249                 dst = NULL;
2250
2251         /*
2252          * When the hardware reports an accurate Tx ACK status, it's
2253          * better to send a nullfunc frame instead of a probe request,
2254          * as it will kick us off the AP quickly if we aren't associated
2255          * anymore. The timeout will be reset if the frame is ACKed by
2256          * the AP.
2257          */
2258         ifmgd->probe_send_count++;
2259
2260         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2261                 ifmgd->nullfunc_failed = false;
2262                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2263         } else {
2264                 int ssid_len;
2265
2266                 rcu_read_lock();
2267                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2268                 if (WARN_ON_ONCE(ssid == NULL))
2269                         ssid_len = 0;
2270                 else
2271                         ssid_len = ssid[1];
2272
2273                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2274                                          ssid + 2, ssid_len, NULL,
2275                                          0, (u32) -1, true, 0,
2276                                          ifmgd->associated->channel, false);
2277                 rcu_read_unlock();
2278         }
2279
2280         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2281         run_again(sdata, ifmgd->probe_timeout);
2282 }
2283
2284 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2285                                    bool beacon)
2286 {
2287         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2288         bool already = false;
2289
2290         if (!ieee80211_sdata_running(sdata))
2291                 return;
2292
2293         sdata_lock(sdata);
2294
2295         if (!ifmgd->associated)
2296                 goto out;
2297
2298         mutex_lock(&sdata->local->mtx);
2299
2300         if (sdata->local->tmp_channel || sdata->local->scanning) {
2301                 mutex_unlock(&sdata->local->mtx);
2302                 goto out;
2303         }
2304
2305         if (beacon) {
2306                 mlme_dbg_ratelimited(sdata,
2307                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2308                                      beacon_loss_count);
2309
2310                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2311         }
2312
2313         /*
2314          * The driver/our work has already reported this event or the
2315          * connection monitoring has kicked in and we have already sent
2316          * a probe request. Or maybe the AP died and the driver keeps
2317          * reporting until we disassociate...
2318          *
2319          * In either case we have to ignore the current call to this
2320          * function (except for setting the correct probe reason bit)
2321          * because otherwise we would reset the timer every time and
2322          * never check whether we received a probe response!
2323          */
2324         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2325                 already = true;
2326
2327         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2328
2329         mutex_unlock(&sdata->local->mtx);
2330
2331         if (already)
2332                 goto out;
2333
2334         mutex_lock(&sdata->local->iflist_mtx);
2335         ieee80211_recalc_ps(sdata->local, -1);
2336         mutex_unlock(&sdata->local->iflist_mtx);
2337
2338         ifmgd->probe_send_count = 0;
2339         ieee80211_mgd_probe_ap_send(sdata);
2340  out:
2341         sdata_unlock(sdata);
2342 }
2343
2344 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2345                                           struct ieee80211_vif *vif)
2346 {
2347         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2348         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2349         struct cfg80211_bss *cbss;
2350         struct sk_buff *skb;
2351         const u8 *ssid;
2352         int ssid_len;
2353
2354         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2355                 return NULL;
2356
2357         sdata_assert_lock(sdata);
2358
2359         if (ifmgd->associated)
2360                 cbss = ifmgd->associated;
2361         else if (ifmgd->auth_data)
2362                 cbss = ifmgd->auth_data->bss;
2363         else if (ifmgd->assoc_data)
2364                 cbss = ifmgd->assoc_data->bss;
2365         else
2366                 return NULL;
2367
2368         rcu_read_lock();
2369         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2370         if (WARN_ON_ONCE(ssid == NULL))
2371                 ssid_len = 0;
2372         else
2373                 ssid_len = ssid[1];
2374
2375         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2376                                         (u32) -1, cbss->channel,
2377                                         ssid + 2, ssid_len,
2378                                         NULL, 0, true);
2379         rcu_read_unlock();
2380
2381         return skb;
2382 }
2383 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2384
2385 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2386                                         const u8 *buf, size_t len, bool tx,
2387                                         u16 reason)
2388 {
2389         struct ieee80211_event event = {
2390                 .type = MLME_EVENT,
2391                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2392                 .u.mlme.reason = reason,
2393         };
2394
2395         if (tx)
2396                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2397         else
2398                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2399
2400         drv_event_callback(sdata->local, sdata, &event);
2401 }
2402
2403 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2404 {
2405         struct ieee80211_local *local = sdata->local;
2406         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2407         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2408
2409         sdata_lock(sdata);
2410         if (!ifmgd->associated) {
2411                 sdata_unlock(sdata);
2412                 return;
2413         }
2414
2415         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2416                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2417                                true, frame_buf);
2418         mutex_lock(&local->mtx);
2419         sdata->vif.csa_active = false;
2420         ifmgd->csa_waiting_bcn = false;
2421         if (sdata->csa_block_tx) {
2422                 ieee80211_wake_vif_queues(local, sdata,
2423                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2424                 sdata->csa_block_tx = false;
2425         }
2426         mutex_unlock(&local->mtx);
2427
2428         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2429                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2430
2431         sdata_unlock(sdata);
2432 }
2433
2434 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2435 {
2436         struct ieee80211_sub_if_data *sdata =
2437                 container_of(work, struct ieee80211_sub_if_data,
2438                              u.mgd.beacon_connection_loss_work);
2439         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2440         struct sta_info *sta;
2441
2442         if (ifmgd->associated) {
2443                 rcu_read_lock();
2444                 sta = sta_info_get(sdata, ifmgd->bssid);
2445                 if (sta)
2446                         sta->beacon_loss_count++;
2447                 rcu_read_unlock();
2448         }
2449
2450         if (ifmgd->connection_loss) {
2451                 sdata_info(sdata, "Connection to AP %pM lost\n",
2452                            ifmgd->bssid);
2453                 __ieee80211_disconnect(sdata);
2454         } else {
2455                 ieee80211_mgd_probe_ap(sdata, true);
2456         }
2457 }
2458
2459 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2460 {
2461         struct ieee80211_sub_if_data *sdata =
2462                 container_of(work, struct ieee80211_sub_if_data,
2463                              u.mgd.csa_connection_drop_work);
2464
2465         __ieee80211_disconnect(sdata);
2466 }
2467
2468 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2469 {
2470         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2471         struct ieee80211_hw *hw = &sdata->local->hw;
2472
2473         trace_api_beacon_loss(sdata);
2474
2475         sdata->u.mgd.connection_loss = false;
2476         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2477 }
2478 EXPORT_SYMBOL(ieee80211_beacon_loss);
2479
2480 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2481 {
2482         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2483         struct ieee80211_hw *hw = &sdata->local->hw;
2484
2485         trace_api_connection_loss(sdata);
2486
2487         sdata->u.mgd.connection_loss = true;
2488         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2489 }
2490 EXPORT_SYMBOL(ieee80211_connection_loss);
2491
2492
2493 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2494                                         bool assoc)
2495 {
2496         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2497
2498         sdata_assert_lock(sdata);
2499
2500         if (!assoc) {
2501                 /*
2502                  * we are not authenticated yet, the only timer that could be
2503                  * running is the timeout for the authentication response which
2504                  * which is not relevant anymore.
2505                  */
2506                 del_timer_sync(&sdata->u.mgd.timer);
2507                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2508
2509                 eth_zero_addr(sdata->u.mgd.bssid);
2510                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2511                 sdata->u.mgd.flags = 0;
2512                 mutex_lock(&sdata->local->mtx);
2513                 ieee80211_vif_release_channel(sdata);
2514                 mutex_unlock(&sdata->local->mtx);
2515         }
2516
2517         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2518         kfree(auth_data);
2519         sdata->u.mgd.auth_data = NULL;
2520 }
2521
2522 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2523                                          bool assoc)
2524 {
2525         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2526
2527         sdata_assert_lock(sdata);
2528
2529         if (!assoc) {
2530                 /*
2531                  * we are not associated yet, the only timer that could be
2532                  * running is the timeout for the association response which
2533                  * which is not relevant anymore.
2534                  */
2535                 del_timer_sync(&sdata->u.mgd.timer);
2536                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2537
2538                 eth_zero_addr(sdata->u.mgd.bssid);
2539                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2540                 sdata->u.mgd.flags = 0;
2541                 mutex_lock(&sdata->local->mtx);
2542                 ieee80211_vif_release_channel(sdata);
2543                 mutex_unlock(&sdata->local->mtx);
2544         }
2545
2546         kfree(assoc_data);
2547         sdata->u.mgd.assoc_data = NULL;
2548 }
2549
2550 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2551                                      struct ieee80211_mgmt *mgmt, size_t len)
2552 {
2553         struct ieee80211_local *local = sdata->local;
2554         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2555         u8 *pos;
2556         struct ieee802_11_elems elems;
2557         u32 tx_flags = 0;
2558
2559         pos = mgmt->u.auth.variable;
2560         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2561         if (!elems.challenge)
2562                 return;
2563         auth_data->expected_transaction = 4;
2564         drv_mgd_prepare_tx(sdata->local, sdata);
2565         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2566                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2567                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2568         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2569                             elems.challenge - 2, elems.challenge_len + 2,
2570                             auth_data->bss->bssid, auth_data->bss->bssid,
2571                             auth_data->key, auth_data->key_len,
2572                             auth_data->key_idx, tx_flags);
2573 }
2574
2575 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2576                                    struct ieee80211_mgmt *mgmt, size_t len)
2577 {
2578         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2579         u8 bssid[ETH_ALEN];
2580         u16 auth_alg, auth_transaction, status_code;
2581         struct sta_info *sta;
2582         struct ieee80211_event event = {
2583                 .type = MLME_EVENT,
2584                 .u.mlme.data = AUTH_EVENT,
2585         };
2586
2587         sdata_assert_lock(sdata);
2588
2589         if (len < 24 + 6)
2590                 return;
2591
2592         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2593                 return;
2594
2595         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2596
2597         if (!ether_addr_equal(bssid, mgmt->bssid))
2598                 return;
2599
2600         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2601         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2602         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2603
2604         if (auth_alg != ifmgd->auth_data->algorithm ||
2605             auth_transaction != ifmgd->auth_data->expected_transaction) {
2606                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2607                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2608                            auth_transaction,
2609                            ifmgd->auth_data->expected_transaction);
2610                 return;
2611         }
2612
2613         if (status_code != WLAN_STATUS_SUCCESS) {
2614                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2615                            mgmt->sa, status_code);
2616                 ieee80211_destroy_auth_data(sdata, false);
2617                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2618                 event.u.mlme.status = MLME_DENIED;
2619                 event.u.mlme.reason = status_code;
2620                 drv_event_callback(sdata->local, sdata, &event);
2621                 return;
2622         }
2623
2624         switch (ifmgd->auth_data->algorithm) {
2625         case WLAN_AUTH_OPEN:
2626         case WLAN_AUTH_LEAP:
2627         case WLAN_AUTH_FT:
2628         case WLAN_AUTH_SAE:
2629                 break;
2630         case WLAN_AUTH_SHARED_KEY:
2631                 if (ifmgd->auth_data->expected_transaction != 4) {
2632                         ieee80211_auth_challenge(sdata, mgmt, len);
2633                         /* need another frame */
2634                         return;
2635                 }
2636                 break;
2637         default:
2638                 WARN_ONCE(1, "invalid auth alg %d",
2639                           ifmgd->auth_data->algorithm);
2640                 return;
2641         }
2642
2643         event.u.mlme.status = MLME_SUCCESS;
2644         drv_event_callback(sdata->local, sdata, &event);
2645         sdata_info(sdata, "authenticated\n");
2646         ifmgd->auth_data->done = true;
2647         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2648         ifmgd->auth_data->timeout_started = true;
2649         run_again(sdata, ifmgd->auth_data->timeout);
2650
2651         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2652             ifmgd->auth_data->expected_transaction != 2) {
2653                 /*
2654                  * Report auth frame to user space for processing since another
2655                  * round of Authentication frames is still needed.
2656                  */
2657                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2658                 return;
2659         }
2660
2661         /* move station state to auth */
2662         mutex_lock(&sdata->local->sta_mtx);
2663         sta = sta_info_get(sdata, bssid);
2664         if (!sta) {
2665                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2666                 goto out_err;
2667         }
2668         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2669                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2670                 goto out_err;
2671         }
2672         mutex_unlock(&sdata->local->sta_mtx);
2673
2674         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2675         return;
2676  out_err:
2677         mutex_unlock(&sdata->local->sta_mtx);
2678         /* ignore frame -- wait for timeout */
2679 }
2680
2681 #define case_WLAN(type) \
2682         case WLAN_REASON_##type: return #type
2683
2684 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2685 {
2686         switch (reason_code) {
2687         case_WLAN(UNSPECIFIED);
2688         case_WLAN(PREV_AUTH_NOT_VALID);
2689         case_WLAN(DEAUTH_LEAVING);
2690         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2691         case_WLAN(DISASSOC_AP_BUSY);
2692         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2693         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2694         case_WLAN(DISASSOC_STA_HAS_LEFT);
2695         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2696         case_WLAN(DISASSOC_BAD_POWER);
2697         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2698         case_WLAN(INVALID_IE);
2699         case_WLAN(MIC_FAILURE);
2700         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2701         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2702         case_WLAN(IE_DIFFERENT);
2703         case_WLAN(INVALID_GROUP_CIPHER);
2704         case_WLAN(INVALID_PAIRWISE_CIPHER);
2705         case_WLAN(INVALID_AKMP);
2706         case_WLAN(UNSUPP_RSN_VERSION);
2707         case_WLAN(INVALID_RSN_IE_CAP);
2708         case_WLAN(IEEE8021X_FAILED);
2709         case_WLAN(CIPHER_SUITE_REJECTED);
2710         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2711         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2712         case_WLAN(DISASSOC_LOW_ACK);
2713         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2714         case_WLAN(QSTA_LEAVE_QBSS);
2715         case_WLAN(QSTA_NOT_USE);
2716         case_WLAN(QSTA_REQUIRE_SETUP);
2717         case_WLAN(QSTA_TIMEOUT);
2718         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2719         case_WLAN(MESH_PEER_CANCELED);
2720         case_WLAN(MESH_MAX_PEERS);
2721         case_WLAN(MESH_CONFIG);
2722         case_WLAN(MESH_CLOSE);
2723         case_WLAN(MESH_MAX_RETRIES);
2724         case_WLAN(MESH_CONFIRM_TIMEOUT);
2725         case_WLAN(MESH_INVALID_GTK);
2726         case_WLAN(MESH_INCONSISTENT_PARAM);
2727         case_WLAN(MESH_INVALID_SECURITY);
2728         case_WLAN(MESH_PATH_ERROR);
2729         case_WLAN(MESH_PATH_NOFORWARD);
2730         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2731         case_WLAN(MAC_EXISTS_IN_MBSS);
2732         case_WLAN(MESH_CHAN_REGULATORY);
2733         case_WLAN(MESH_CHAN);
2734         default: return "<unknown>";
2735         }
2736 }
2737
2738 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2739                                      struct ieee80211_mgmt *mgmt, size_t len)
2740 {
2741         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2742         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2743
2744         sdata_assert_lock(sdata);
2745
2746         if (len < 24 + 2)
2747                 return;
2748
2749         if (ifmgd->associated &&
2750             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2751                 const u8 *bssid = ifmgd->associated->bssid;
2752
2753                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2754                            bssid, reason_code,
2755                            ieee80211_get_reason_code_string(reason_code));
2756
2757                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2758
2759                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2760                                             reason_code);
2761                 return;
2762         }
2763
2764         if (ifmgd->assoc_data &&
2765             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2766                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2767
2768                 sdata_info(sdata,
2769                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2770                            bssid, reason_code,
2771                            ieee80211_get_reason_code_string(reason_code));
2772
2773                 ieee80211_destroy_assoc_data(sdata, false);
2774
2775                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2776                 return;
2777         }
2778 }
2779
2780
2781 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2782                                        struct ieee80211_mgmt *mgmt, size_t len)
2783 {
2784         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2785         u16 reason_code;
2786
2787         sdata_assert_lock(sdata);
2788
2789         if (len < 24 + 2)
2790                 return;
2791
2792         if (!ifmgd->associated ||
2793             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2794                 return;
2795
2796         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2797
2798         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2799                    mgmt->sa, reason_code);
2800
2801         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2802
2803         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2804 }
2805
2806 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2807                                 u8 *supp_rates, unsigned int supp_rates_len,
2808                                 u32 *rates, u32 *basic_rates,
2809                                 bool *have_higher_than_11mbit,
2810                                 int *min_rate, int *min_rate_index,
2811                                 int shift, u32 rate_flags)
2812 {
2813         int i, j;
2814
2815         for (i = 0; i < supp_rates_len; i++) {
2816                 int rate = supp_rates[i] & 0x7f;
2817                 bool is_basic = !!(supp_rates[i] & 0x80);
2818
2819                 if ((rate * 5 * (1 << shift)) > 110)
2820                         *have_higher_than_11mbit = true;
2821
2822                 /*
2823                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2824                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2825                  *
2826                  * Note: Even through the membership selector and the basic
2827                  *       rate flag share the same bit, they are not exactly
2828                  *       the same.
2829                  */
2830                 if (!!(supp_rates[i] & 0x80) &&
2831                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2832                         continue;
2833
2834                 for (j = 0; j < sband->n_bitrates; j++) {
2835                         struct ieee80211_rate *br;
2836                         int brate;
2837
2838                         br = &sband->bitrates[j];
2839                         if ((rate_flags & br->flags) != rate_flags)
2840                                 continue;
2841
2842                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2843                         if (brate == rate) {
2844                                 *rates |= BIT(j);
2845                                 if (is_basic)
2846                                         *basic_rates |= BIT(j);
2847                                 if ((rate * 5) < *min_rate) {
2848                                         *min_rate = rate * 5;
2849                                         *min_rate_index = j;
2850                                 }
2851                                 break;
2852                         }
2853                 }
2854         }
2855 }
2856
2857 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2858                                     struct cfg80211_bss *cbss,
2859                                     struct ieee80211_mgmt *mgmt, size_t len)
2860 {
2861         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2862         struct ieee80211_local *local = sdata->local;
2863         struct ieee80211_supported_band *sband;
2864         struct sta_info *sta;
2865         u8 *pos;
2866         u16 capab_info, aid;
2867         struct ieee802_11_elems elems;
2868         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2869         const struct cfg80211_bss_ies *bss_ies = NULL;
2870         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2871         u32 changed = 0;
2872         int err;
2873         bool ret;
2874
2875         /* AssocResp and ReassocResp have identical structure */
2876
2877         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2878         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2879
2880         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2881                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2882                            aid);
2883         aid &= ~(BIT(15) | BIT(14));
2884
2885         ifmgd->broken_ap = false;
2886
2887         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2888                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2889                            aid);
2890                 aid = 0;
2891                 ifmgd->broken_ap = true;
2892         }
2893
2894         pos = mgmt->u.assoc_resp.variable;
2895         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2896
2897         if (!elems.supp_rates) {
2898                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2899                 return false;
2900         }
2901
2902         ifmgd->aid = aid;
2903         ifmgd->tdls_chan_switch_prohibited =
2904                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2905                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2906
2907         /*
2908          * Some APs are erroneously not including some information in their
2909          * (re)association response frames. Try to recover by using the data
2910          * from the beacon or probe response. This seems to afflict mobile
2911          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2912          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2913          */
2914         if ((assoc_data->wmm && !elems.wmm_param) ||
2915             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2916              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2917             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2918              (!elems.vht_cap_elem || !elems.vht_operation))) {
2919                 const struct cfg80211_bss_ies *ies;
2920                 struct ieee802_11_elems bss_elems;
2921
2922                 rcu_read_lock();
2923                 ies = rcu_dereference(cbss->ies);
2924                 if (ies)
2925                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2926                                           GFP_ATOMIC);
2927                 rcu_read_unlock();
2928                 if (!bss_ies)
2929                         return false;
2930
2931                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2932                                        false, &bss_elems);
2933                 if (assoc_data->wmm &&
2934                     !elems.wmm_param && bss_elems.wmm_param) {
2935                         elems.wmm_param = bss_elems.wmm_param;
2936                         sdata_info(sdata,
2937                                    "AP bug: WMM param missing from AssocResp\n");
2938                 }
2939
2940                 /*
2941                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2942                  * have to include the IEs in the (re)association response.
2943                  */
2944                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2945                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2946                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2947                         sdata_info(sdata,
2948                                    "AP bug: HT capability missing from AssocResp\n");
2949                 }
2950                 if (!elems.ht_operation && bss_elems.ht_operation &&
2951                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2952                         elems.ht_operation = bss_elems.ht_operation;
2953                         sdata_info(sdata,
2954                                    "AP bug: HT operation missing from AssocResp\n");
2955                 }
2956                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2957                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2958                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2959                         sdata_info(sdata,
2960                                    "AP bug: VHT capa missing from AssocResp\n");
2961                 }
2962                 if (!elems.vht_operation && bss_elems.vht_operation &&
2963                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2964                         elems.vht_operation = bss_elems.vht_operation;
2965                         sdata_info(sdata,
2966                                    "AP bug: VHT operation missing from AssocResp\n");
2967                 }
2968         }
2969
2970         /*
2971          * We previously checked these in the beacon/probe response, so
2972          * they should be present here. This is just a safety net.
2973          */
2974         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2975             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2976                 sdata_info(sdata,
2977                            "HT AP is missing WMM params or HT capability/operation\n");
2978                 ret = false;
2979                 goto out;
2980         }
2981
2982         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2983             (!elems.vht_cap_elem || !elems.vht_operation)) {
2984                 sdata_info(sdata,
2985                            "VHT AP is missing VHT capability/operation\n");
2986                 ret = false;
2987                 goto out;
2988         }
2989
2990         mutex_lock(&sdata->local->sta_mtx);
2991         /*
2992          * station info was already allocated and inserted before
2993          * the association and should be available to us
2994          */
2995         sta = sta_info_get(sdata, cbss->bssid);
2996         if (WARN_ON(!sta)) {
2997                 mutex_unlock(&sdata->local->sta_mtx);
2998                 ret = false;
2999                 goto out;
3000         }
3001
3002         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
3003
3004         /* Set up internal HT/VHT capabilities */
3005         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3006                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3007                                                   elems.ht_cap_elem, sta);
3008
3009         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3010                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3011                                                     elems.vht_cap_elem, sta);
3012
3013         /*
3014          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3015          * in their association response, so ignore that data for our own
3016          * configuration. If it changed since the last beacon, we'll get the
3017          * next beacon and update then.
3018          */
3019
3020         /*
3021          * If an operating mode notification IE is present, override the
3022          * NSS calculation (that would be done in rate_control_rate_init())
3023          * and use the # of streams from that element.
3024          */
3025         if (elems.opmode_notif &&
3026             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3027                 u8 nss;
3028
3029                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3030                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3031                 nss += 1;
3032                 sta->sta.rx_nss = nss;
3033         }
3034
3035         rate_control_rate_init(sta);
3036
3037         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3038                 set_sta_flag(sta, WLAN_STA_MFP);
3039                 sta->sta.mfp = true;
3040         } else {
3041                 sta->sta.mfp = false;
3042         }
3043
3044         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3045
3046         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3047         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3048                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3049         if (err) {
3050                 sdata_info(sdata,
3051                            "failed to move station %pM to desired state\n",
3052                            sta->sta.addr);
3053                 WARN_ON(__sta_info_destroy(sta));
3054                 mutex_unlock(&sdata->local->sta_mtx);
3055                 ret = false;
3056                 goto out;
3057         }
3058
3059         mutex_unlock(&sdata->local->sta_mtx);
3060
3061         /*
3062          * Always handle WMM once after association regardless
3063          * of the first value the AP uses. Setting -1 here has
3064          * that effect because the AP values is an unsigned
3065          * 4-bit value.
3066          */
3067         ifmgd->wmm_last_param_set = -1;
3068
3069         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
3070                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3071                                          elems.wmm_param_len);
3072         else
3073                 ieee80211_set_wmm_default(sdata, false);
3074         changed |= BSS_CHANGED_QOS;
3075
3076         /* set AID and assoc capability,
3077          * ieee80211_set_associated() will tell the driver */
3078         bss_conf->aid = aid;
3079         bss_conf->assoc_capability = capab_info;
3080         ieee80211_set_associated(sdata, cbss, changed);
3081
3082         /*
3083          * If we're using 4-addr mode, let the AP know that we're
3084          * doing so, so that it can create the STA VLAN on its side
3085          */
3086         if (ifmgd->use_4addr)
3087                 ieee80211_send_4addr_nullfunc(local, sdata);
3088
3089         /*
3090          * Start timer to probe the connection to the AP now.
3091          * Also start the timer that will detect beacon loss.
3092          */
3093         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3094         ieee80211_sta_reset_beacon_monitor(sdata);
3095
3096         ret = true;
3097  out:
3098         kfree(bss_ies);
3099         return ret;
3100 }
3101
3102 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3103                                          struct ieee80211_mgmt *mgmt,
3104                                          size_t len)
3105 {
3106         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3107         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3108         u16 capab_info, status_code, aid;
3109         struct ieee802_11_elems elems;
3110         int ac, uapsd_queues = -1;
3111         u8 *pos;
3112         bool reassoc;
3113         struct cfg80211_bss *bss;
3114         struct ieee80211_event event = {
3115                 .type = MLME_EVENT,
3116                 .u.mlme.data = ASSOC_EVENT,
3117         };
3118
3119         sdata_assert_lock(sdata);
3120
3121         if (!assoc_data)
3122                 return;
3123         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3124                 return;
3125
3126         /*
3127          * AssocResp and ReassocResp have identical structure, so process both
3128          * of them in this function.
3129          */
3130
3131         if (len < 24 + 6)
3132                 return;
3133
3134         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3135         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3136         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3137         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3138
3139         sdata_info(sdata,
3140                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3141                    reassoc ? "Rea" : "A", mgmt->sa,
3142                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3143
3144         pos = mgmt->u.assoc_resp.variable;
3145         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3146
3147         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3148             elems.timeout_int &&
3149             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3150                 u32 tu, ms;
3151                 tu = le32_to_cpu(elems.timeout_int->value);
3152                 ms = tu * 1024 / 1000;
3153                 sdata_info(sdata,
3154                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3155                            mgmt->sa, tu, ms);
3156                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3157                 assoc_data->timeout_started = true;
3158                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3159                         run_again(sdata, assoc_data->timeout);
3160                 return;
3161         }
3162
3163         bss = assoc_data->bss;
3164
3165         if (status_code != WLAN_STATUS_SUCCESS) {
3166                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3167                            mgmt->sa, status_code);
3168                 ieee80211_destroy_assoc_data(sdata, false);
3169                 event.u.mlme.status = MLME_DENIED;
3170                 event.u.mlme.reason = status_code;
3171                 drv_event_callback(sdata->local, sdata, &event);
3172         } else {
3173                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3174                         /* oops -- internal error -- send timeout for now */
3175                         ieee80211_destroy_assoc_data(sdata, false);
3176                         cfg80211_assoc_timeout(sdata->dev, bss);
3177                         return;
3178                 }
3179                 event.u.mlme.status = MLME_SUCCESS;
3180                 drv_event_callback(sdata->local, sdata, &event);
3181                 sdata_info(sdata, "associated\n");
3182
3183                 /*
3184                  * destroy assoc_data afterwards, as otherwise an idle
3185                  * recalc after assoc_data is NULL but before associated
3186                  * is set can cause the interface to go idle
3187                  */
3188                 ieee80211_destroy_assoc_data(sdata, true);
3189
3190                 /* get uapsd queues configuration */
3191                 uapsd_queues = 0;
3192                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3193                         if (sdata->tx_conf[ac].uapsd)
3194                                 uapsd_queues |= BIT(ac);
3195         }
3196
3197         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3198 }
3199
3200 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3201                                   struct ieee80211_mgmt *mgmt, size_t len,
3202                                   struct ieee80211_rx_status *rx_status,
3203                                   struct ieee802_11_elems *elems)
3204 {
3205         struct ieee80211_local *local = sdata->local;
3206         struct ieee80211_bss *bss;
3207         struct ieee80211_channel *channel;
3208
3209         sdata_assert_lock(sdata);
3210
3211         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3212         if (!channel)
3213                 return;
3214
3215         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3216                                         channel);
3217         if (bss) {
3218                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3219                 ieee80211_rx_bss_put(local, bss);
3220         }
3221 }
3222
3223
3224 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3225                                          struct sk_buff *skb)
3226 {
3227         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3228         struct ieee80211_if_managed *ifmgd;
3229         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3230         size_t baselen, len = skb->len;
3231         struct ieee802_11_elems elems;
3232
3233         ifmgd = &sdata->u.mgd;
3234
3235         sdata_assert_lock(sdata);
3236
3237         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3238                 return; /* ignore ProbeResp to foreign address */
3239
3240         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3241         if (baselen > len)
3242                 return;
3243
3244         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3245                                false, &elems);
3246
3247         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3248
3249         if (ifmgd->associated &&
3250             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3251                 ieee80211_reset_ap_probe(sdata);
3252
3253         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3254             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3255                 /* got probe response, continue with auth */
3256                 sdata_info(sdata, "direct probe responded\n");
3257                 ifmgd->auth_data->tries = 0;
3258                 ifmgd->auth_data->timeout = jiffies;
3259                 ifmgd->auth_data->timeout_started = true;
3260                 run_again(sdata, ifmgd->auth_data->timeout);
3261         }
3262 }
3263
3264 /*
3265  * This is the canonical list of information elements we care about,
3266  * the filter code also gives us all changes to the Microsoft OUI
3267  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3268  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3269  * changes to requested client power.
3270  *
3271  * We implement beacon filtering in software since that means we can
3272  * avoid processing the frame here and in cfg80211, and userspace
3273  * will not be able to tell whether the hardware supports it or not.
3274  *
3275  * XXX: This list needs to be dynamic -- userspace needs to be able to
3276  *      add items it requires. It also needs to be able to tell us to
3277  *      look out for other vendor IEs.
3278  */
3279 static const u64 care_about_ies =
3280         (1ULL << WLAN_EID_COUNTRY) |
3281         (1ULL << WLAN_EID_ERP_INFO) |
3282         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3283         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3284         (1ULL << WLAN_EID_HT_CAPABILITY) |
3285         (1ULL << WLAN_EID_HT_OPERATION) |
3286         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3287
3288 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3289                                      struct ieee80211_mgmt *mgmt, size_t len,
3290                                      struct ieee80211_rx_status *rx_status)
3291 {
3292         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3293         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3294         size_t baselen;
3295         struct ieee802_11_elems elems;
3296         struct ieee80211_local *local = sdata->local;
3297         struct ieee80211_chanctx_conf *chanctx_conf;
3298         struct ieee80211_channel *chan;
3299         struct sta_info *sta;
3300         u32 changed = 0;
3301         bool erp_valid;
3302         u8 erp_value = 0;
3303         u32 ncrc;
3304         u8 *bssid;
3305         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3306
3307         sdata_assert_lock(sdata);
3308
3309         /* Process beacon from the current BSS */
3310         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3311         if (baselen > len)
3312                 return;
3313
3314         rcu_read_lock();
3315         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3316         if (!chanctx_conf) {
3317                 rcu_read_unlock();
3318                 return;
3319         }
3320
3321         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3322                 rcu_read_unlock();
3323                 return;
3324         }
3325         chan = chanctx_conf->def.chan;
3326         rcu_read_unlock();
3327
3328         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3329             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3330                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3331                                        len - baselen, false, &elems);
3332
3333                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3334                 if (elems.tim && !elems.parse_error) {
3335                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3336                         ifmgd->dtim_period = tim_ie->dtim_period;
3337                 }
3338                 ifmgd->have_beacon = true;
3339                 ifmgd->assoc_data->need_beacon = false;
3340                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3341                         sdata->vif.bss_conf.sync_tsf =
3342                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3343                         sdata->vif.bss_conf.sync_device_ts =
3344                                 rx_status->device_timestamp;
3345                         if (elems.tim)
3346                                 sdata->vif.bss_conf.sync_dtim_count =
3347                                         elems.tim->dtim_count;
3348                         else
3349                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3350                 }
3351                 /* continue assoc process */
3352                 ifmgd->assoc_data->timeout = jiffies;
3353                 ifmgd->assoc_data->timeout_started = true;
3354                 run_again(sdata, ifmgd->assoc_data->timeout);
3355                 return;
3356         }
3357
3358         if (!ifmgd->associated ||
3359             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3360                 return;
3361         bssid = ifmgd->associated->bssid;
3362
3363         /* Track average RSSI from the Beacon frames of the current AP */
3364         ifmgd->last_beacon_signal = rx_status->signal;
3365         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3366                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3367                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3368                 ifmgd->last_cqm_event_signal = 0;
3369                 ifmgd->count_beacon_signal = 1;
3370                 ifmgd->last_ave_beacon_signal = 0;
3371         } else {
3372                 ifmgd->ave_beacon_signal =
3373                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3374                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3375                          ifmgd->ave_beacon_signal) / 16;
3376                 ifmgd->count_beacon_signal++;
3377         }
3378
3379         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3380             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3381                 int sig = ifmgd->ave_beacon_signal;
3382                 int last_sig = ifmgd->last_ave_beacon_signal;
3383                 struct ieee80211_event event = {
3384                         .type = RSSI_EVENT,
3385                 };
3386
3387                 /*
3388                  * if signal crosses either of the boundaries, invoke callback
3389                  * with appropriate parameters
3390                  */
3391                 if (sig > ifmgd->rssi_max_thold &&
3392                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3393                         ifmgd->last_ave_beacon_signal = sig;
3394                         event.u.rssi.data = RSSI_EVENT_HIGH;
3395                         drv_event_callback(local, sdata, &event);
3396                 } else if (sig < ifmgd->rssi_min_thold &&
3397                            (last_sig >= ifmgd->rssi_max_thold ||
3398                            last_sig == 0)) {
3399                         ifmgd->last_ave_beacon_signal = sig;
3400                         event.u.rssi.data = RSSI_EVENT_LOW;
3401                         drv_event_callback(local, sdata, &event);
3402                 }
3403         }
3404
3405         if (bss_conf->cqm_rssi_thold &&
3406             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3407             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3408                 int sig = ifmgd->ave_beacon_signal / 16;
3409                 int last_event = ifmgd->last_cqm_event_signal;
3410                 int thold = bss_conf->cqm_rssi_thold;
3411                 int hyst = bss_conf->cqm_rssi_hyst;
3412                 if (sig < thold &&
3413                     (last_event == 0 || sig < last_event - hyst)) {
3414                         ifmgd->last_cqm_event_signal = sig;
3415                         ieee80211_cqm_rssi_notify(
3416                                 &sdata->vif,
3417                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3418                                 GFP_KERNEL);
3419                 } else if (sig > thold &&
3420                            (last_event == 0 || sig > last_event + hyst)) {
3421                         ifmgd->last_cqm_event_signal = sig;
3422                         ieee80211_cqm_rssi_notify(
3423                                 &sdata->vif,
3424                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3425                                 GFP_KERNEL);
3426                 }
3427         }
3428
3429         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3430                 mlme_dbg_ratelimited(sdata,
3431                                      "cancelling AP probe due to a received beacon\n");
3432                 ieee80211_reset_ap_probe(sdata);
3433         }
3434
3435         /*
3436          * Push the beacon loss detection into the future since
3437          * we are processing a beacon from the AP just now.
3438          */
3439         ieee80211_sta_reset_beacon_monitor(sdata);
3440
3441         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3442         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3443                                           len - baselen, false, &elems,
3444                                           care_about_ies, ncrc);
3445
3446         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) {
3447                 bool directed_tim = ieee80211_check_tim(elems.tim,
3448                                                         elems.tim_len,
3449                                                         ifmgd->aid);
3450                 if (directed_tim) {
3451                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3452                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3453                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3454                                         ieee80211_hw_config(local,
3455                                                             IEEE80211_CONF_CHANGE_PS);
3456                                 }
3457                                 ieee80211_send_nullfunc(local, sdata, 0);
3458                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3459                                 local->pspolling = true;
3460
3461                                 /*
3462                                  * Here is assumed that the driver will be
3463                                  * able to send ps-poll frame and receive a
3464                                  * response even though power save mode is
3465                                  * enabled, but some drivers might require
3466                                  * to disable power save here. This needs
3467                                  * to be investigated.
3468                                  */
3469                                 ieee80211_send_pspoll(local, sdata);
3470                         }
3471                 }
3472         }
3473
3474         if (sdata->vif.p2p) {
3475                 struct ieee80211_p2p_noa_attr noa = {};
3476                 int ret;
3477
3478                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3479                                             len - baselen,
3480                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3481                                             (u8 *) &noa, sizeof(noa));
3482                 if (ret >= 2) {
3483                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3484                                 /* valid noa_attr and index changed */
3485                                 sdata->u.mgd.p2p_noa_index = noa.index;
3486                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3487                                 changed |= BSS_CHANGED_P2P_PS;
3488                                 /*
3489                                  * make sure we update all information, the CRC
3490                                  * mechanism doesn't look at P2P attributes.
3491                                  */
3492                                 ifmgd->beacon_crc_valid = false;
3493                         }
3494                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3495                         /* noa_attr not found and we had valid noa_attr before */
3496                         sdata->u.mgd.p2p_noa_index = -1;
3497                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3498                         changed |= BSS_CHANGED_P2P_PS;
3499                         ifmgd->beacon_crc_valid = false;
3500                 }
3501         }
3502
3503         if (ifmgd->csa_waiting_bcn)
3504                 ieee80211_chswitch_post_beacon(sdata);
3505
3506         /*
3507          * Update beacon timing and dtim count on every beacon appearance. This
3508          * will allow the driver to use the most updated values. Do it before
3509          * comparing this one with last received beacon.
3510          * IMPORTANT: These parameters would possibly be out of sync by the time
3511          * the driver will use them. The synchronized view is currently
3512          * guaranteed only in certain callbacks.
3513          */
3514         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3515                 sdata->vif.bss_conf.sync_tsf =
3516                         le64_to_cpu(mgmt->u.beacon.timestamp);
3517                 sdata->vif.bss_conf.sync_device_ts =
3518                         rx_status->device_timestamp;
3519                 if (elems.tim)
3520                         sdata->vif.bss_conf.sync_dtim_count =
3521                                 elems.tim->dtim_count;
3522                 else
3523                         sdata->vif.bss_conf.sync_dtim_count = 0;
3524         }
3525
3526         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3527                 return;
3528         ifmgd->beacon_crc = ncrc;
3529         ifmgd->beacon_crc_valid = true;
3530
3531         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3532
3533         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3534                                          rx_status->device_timestamp,
3535                                          &elems, true);
3536
3537         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3538             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3539                                      elems.wmm_param_len))
3540                 changed |= BSS_CHANGED_QOS;
3541
3542         /*
3543          * If we haven't had a beacon before, tell the driver about the
3544          * DTIM period (and beacon timing if desired) now.
3545          */
3546         if (!ifmgd->have_beacon) {
3547                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3548                 if (elems.tim)
3549                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3550                 else
3551                         bss_conf->dtim_period = 1;
3552
3553                 changed |= BSS_CHANGED_BEACON_INFO;
3554                 ifmgd->have_beacon = true;
3555
3556                 mutex_lock(&local->iflist_mtx);
3557                 ieee80211_recalc_ps(local, -1);
3558                 mutex_unlock(&local->iflist_mtx);
3559
3560                 ieee80211_recalc_ps_vif(sdata);
3561         }
3562
3563         if (elems.erp_info) {
3564                 erp_valid = true;
3565                 erp_value = elems.erp_info[0];
3566         } else {
3567                 erp_valid = false;
3568         }
3569         changed |= ieee80211_handle_bss_capability(sdata,
3570                         le16_to_cpu(mgmt->u.beacon.capab_info),
3571                         erp_valid, erp_value);
3572
3573         mutex_lock(&local->sta_mtx);
3574         sta = sta_info_get(sdata, bssid);
3575
3576         if (ieee80211_config_bw(sdata, sta,
3577                                 elems.ht_cap_elem, elems.ht_operation,
3578                                 elems.vht_operation, bssid, &changed)) {
3579                 mutex_unlock(&local->sta_mtx);
3580                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3581                                        WLAN_REASON_DEAUTH_LEAVING,
3582                                        true, deauth_buf);
3583                 ieee80211_report_disconnect(sdata, deauth_buf,
3584                                             sizeof(deauth_buf), true,
3585                                             WLAN_REASON_DEAUTH_LEAVING);
3586                 return;
3587         }
3588
3589         if (sta && elems.opmode_notif)
3590                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3591                                             rx_status->band, true);
3592         mutex_unlock(&local->sta_mtx);
3593
3594         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3595                                                elems.country_elem,
3596                                                elems.country_elem_len,
3597                                                elems.pwr_constr_elem,
3598                                                elems.cisco_dtpc_elem);
3599
3600         ieee80211_bss_info_change_notify(sdata, changed);
3601 }
3602
3603 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3604                                   struct sk_buff *skb)
3605 {
3606         struct ieee80211_rx_status *rx_status;
3607         struct ieee80211_mgmt *mgmt;
3608         u16 fc;
3609         struct ieee802_11_elems elems;
3610         int ies_len;
3611
3612         rx_status = (struct ieee80211_rx_status *) skb->cb;
3613         mgmt = (struct ieee80211_mgmt *) skb->data;
3614         fc = le16_to_cpu(mgmt->frame_control);
3615
3616         sdata_lock(sdata);
3617
3618         switch (fc & IEEE80211_FCTL_STYPE) {
3619         case IEEE80211_STYPE_BEACON:
3620                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3621                 break;
3622         case IEEE80211_STYPE_PROBE_RESP:
3623                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3624                 break;
3625         case IEEE80211_STYPE_AUTH:
3626                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3627                 break;
3628         case IEEE80211_STYPE_DEAUTH:
3629                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3630                 break;
3631         case IEEE80211_STYPE_DISASSOC:
3632                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3633                 break;
3634         case IEEE80211_STYPE_ASSOC_RESP:
3635         case IEEE80211_STYPE_REASSOC_RESP:
3636                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3637                 break;
3638         case IEEE80211_STYPE_ACTION:
3639                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3640                         ies_len = skb->len -
3641                                   offsetof(struct ieee80211_mgmt,
3642                                            u.action.u.chan_switch.variable);
3643
3644                         if (ies_len < 0)
3645                                 break;
3646
3647                         ieee802_11_parse_elems(
3648                                 mgmt->u.action.u.chan_switch.variable,
3649                                 ies_len, true, &elems);
3650
3651                         if (elems.parse_error)
3652                                 break;
3653
3654                         ieee80211_sta_process_chanswitch(sdata,
3655                                                  rx_status->mactime,
3656                                                  rx_status->device_timestamp,
3657                                                  &elems, false);
3658                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3659                         ies_len = skb->len -
3660                                   offsetof(struct ieee80211_mgmt,
3661                                            u.action.u.ext_chan_switch.variable);
3662
3663                         if (ies_len < 0)
3664                                 break;
3665
3666                         ieee802_11_parse_elems(
3667                                 mgmt->u.action.u.ext_chan_switch.variable,
3668                                 ies_len, true, &elems);
3669
3670                         if (elems.parse_error)
3671                                 break;
3672
3673                         /* for the handling code pretend this was also an IE */
3674                         elems.ext_chansw_ie =
3675                                 &mgmt->u.action.u.ext_chan_switch.data;
3676
3677                         ieee80211_sta_process_chanswitch(sdata,
3678                                                  rx_status->mactime,
3679                                                  rx_status->device_timestamp,
3680                                                  &elems, false);
3681                 }
3682                 break;
3683         }
3684         sdata_unlock(sdata);
3685 }
3686
3687 static void ieee80211_sta_timer(unsigned long data)
3688 {
3689         struct ieee80211_sub_if_data *sdata =
3690                 (struct ieee80211_sub_if_data *) data;
3691
3692         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3693 }
3694
3695 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3696                                           u8 *bssid, u8 reason, bool tx)
3697 {
3698         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3699
3700         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3701                                tx, frame_buf);
3702
3703         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3704                                     reason);
3705 }
3706
3707 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3708 {
3709         struct ieee80211_local *local = sdata->local;
3710         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3711         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3712         u32 tx_flags = 0;
3713
3714         sdata_assert_lock(sdata);
3715
3716         if (WARN_ON_ONCE(!auth_data))
3717                 return -EINVAL;
3718
3719         auth_data->tries++;
3720
3721         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3722                 sdata_info(sdata, "authentication with %pM timed out\n",
3723                            auth_data->bss->bssid);
3724
3725                 /*
3726                  * Most likely AP is not in the range so remove the
3727                  * bss struct for that AP.
3728                  */
3729                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3730
3731                 return -ETIMEDOUT;
3732         }
3733
3734         drv_mgd_prepare_tx(local, sdata);
3735
3736         if (auth_data->bss->proberesp_ies) {
3737                 u16 trans = 1;
3738                 u16 status = 0;
3739
3740                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3741                            auth_data->bss->bssid, auth_data->tries,
3742                            IEEE80211_AUTH_MAX_TRIES);
3743
3744                 auth_data->expected_transaction = 2;
3745
3746                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3747                         trans = auth_data->sae_trans;
3748                         status = auth_data->sae_status;
3749                         auth_data->expected_transaction = trans;
3750                 }
3751
3752                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3753                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3754                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3755
3756                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3757                                     auth_data->data, auth_data->data_len,
3758                                     auth_data->bss->bssid,
3759                                     auth_data->bss->bssid, NULL, 0, 0,
3760                                     tx_flags);
3761         } else {
3762                 const u8 *ssidie;
3763
3764                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3765                            auth_data->bss->bssid, auth_data->tries,
3766                            IEEE80211_AUTH_MAX_TRIES);
3767
3768                 rcu_read_lock();
3769                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3770                 if (!ssidie) {
3771                         rcu_read_unlock();
3772                         return -EINVAL;
3773                 }
3774                 /*
3775                  * Direct probe is sent to broadcast address as some APs
3776                  * will not answer to direct packet in unassociated state.
3777                  */
3778                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
3779                                          ssidie + 2, ssidie[1],
3780                                          NULL, 0, (u32) -1, true, 0,
3781                                          auth_data->bss->channel, false);
3782                 rcu_read_unlock();
3783         }
3784
3785         if (tx_flags == 0) {
3786                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3787                 auth_data->timeout_started = true;
3788                 run_again(sdata, auth_data->timeout);
3789         } else {
3790                 auth_data->timeout =
3791                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3792                 auth_data->timeout_started = true;
3793                 run_again(sdata, auth_data->timeout);
3794         }
3795
3796         return 0;
3797 }
3798
3799 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3800 {
3801         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3802         struct ieee80211_local *local = sdata->local;
3803
3804         sdata_assert_lock(sdata);
3805
3806         assoc_data->tries++;
3807         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3808                 sdata_info(sdata, "association with %pM timed out\n",
3809                            assoc_data->bss->bssid);
3810
3811                 /*
3812                  * Most likely AP is not in the range so remove the
3813                  * bss struct for that AP.
3814                  */
3815                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3816
3817                 return -ETIMEDOUT;
3818         }
3819
3820         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3821                    assoc_data->bss->bssid, assoc_data->tries,
3822                    IEEE80211_ASSOC_MAX_TRIES);
3823         ieee80211_send_assoc(sdata);
3824
3825         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3826                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3827                 assoc_data->timeout_started = true;
3828                 run_again(sdata, assoc_data->timeout);
3829         } else {
3830                 assoc_data->timeout =
3831                         round_jiffies_up(jiffies +
3832                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3833                 assoc_data->timeout_started = true;
3834                 run_again(sdata, assoc_data->timeout);
3835         }
3836
3837         return 0;
3838 }
3839
3840 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3841                                   __le16 fc, bool acked)
3842 {
3843         struct ieee80211_local *local = sdata->local;
3844
3845         sdata->u.mgd.status_fc = fc;
3846         sdata->u.mgd.status_acked = acked;
3847         sdata->u.mgd.status_received = true;
3848
3849         ieee80211_queue_work(&local->hw, &sdata->work);
3850 }
3851
3852 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3853 {
3854         struct ieee80211_local *local = sdata->local;
3855         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3856
3857         sdata_lock(sdata);
3858
3859         if (ifmgd->status_received) {
3860                 __le16 fc = ifmgd->status_fc;
3861                 bool status_acked = ifmgd->status_acked;
3862
3863                 ifmgd->status_received = false;
3864                 if (ifmgd->auth_data &&
3865                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3866                         if (status_acked) {
3867                                 ifmgd->auth_data->timeout =
3868                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3869                                 run_again(sdata, ifmgd->auth_data->timeout);
3870                         } else {
3871                                 ifmgd->auth_data->timeout = jiffies - 1;
3872                         }
3873                         ifmgd->auth_data->timeout_started = true;
3874                 } else if (ifmgd->assoc_data &&
3875                            (ieee80211_is_assoc_req(fc) ||
3876                             ieee80211_is_reassoc_req(fc))) {
3877                         if (status_acked) {
3878                                 ifmgd->assoc_data->timeout =
3879                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3880                                 run_again(sdata, ifmgd->assoc_data->timeout);
3881                         } else {
3882                                 ifmgd->assoc_data->timeout = jiffies - 1;
3883                         }
3884                         ifmgd->assoc_data->timeout_started = true;
3885                 }
3886         }
3887
3888         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3889             time_after(jiffies, ifmgd->auth_data->timeout)) {
3890                 if (ifmgd->auth_data->done) {
3891                         /*
3892                          * ok ... we waited for assoc but userspace didn't,
3893                          * so let's just kill the auth data
3894                          */
3895                         ieee80211_destroy_auth_data(sdata, false);
3896                 } else if (ieee80211_probe_auth(sdata)) {
3897                         u8 bssid[ETH_ALEN];
3898                         struct ieee80211_event event = {
3899                                 .type = MLME_EVENT,
3900                                 .u.mlme.data = AUTH_EVENT,
3901                                 .u.mlme.status = MLME_TIMEOUT,
3902                         };
3903
3904                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3905
3906                         ieee80211_destroy_auth_data(sdata, false);
3907
3908                         cfg80211_auth_timeout(sdata->dev, bssid);
3909                         drv_event_callback(sdata->local, sdata, &event);
3910                 }
3911         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3912                 run_again(sdata, ifmgd->auth_data->timeout);
3913
3914         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3915             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3916                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3917                     ieee80211_do_assoc(sdata)) {
3918                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3919                         struct ieee80211_event event = {
3920                                 .type = MLME_EVENT,
3921                                 .u.mlme.data = ASSOC_EVENT,
3922                                 .u.mlme.status = MLME_TIMEOUT,
3923                         };
3924
3925                         ieee80211_destroy_assoc_data(sdata, false);
3926                         cfg80211_assoc_timeout(sdata->dev, bss);
3927                         drv_event_callback(sdata->local, sdata, &event);
3928                 }
3929         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3930                 run_again(sdata, ifmgd->assoc_data->timeout);
3931
3932         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3933             ifmgd->associated) {
3934                 u8 bssid[ETH_ALEN];
3935                 int max_tries;
3936
3937                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3938
3939                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3940                         max_tries = max_nullfunc_tries;
3941                 else
3942                         max_tries = max_probe_tries;
3943
3944                 /* ACK received for nullfunc probing frame */
3945                 if (!ifmgd->probe_send_count)
3946                         ieee80211_reset_ap_probe(sdata);
3947                 else if (ifmgd->nullfunc_failed) {
3948                         if (ifmgd->probe_send_count < max_tries) {
3949                                 mlme_dbg(sdata,
3950                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3951                                          bssid, ifmgd->probe_send_count,
3952                                          max_tries);
3953                                 ieee80211_mgd_probe_ap_send(sdata);
3954                         } else {
3955                                 mlme_dbg(sdata,
3956                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3957                                          bssid);
3958                                 ieee80211_sta_connection_lost(sdata, bssid,
3959                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3960                                         false);
3961                         }
3962                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3963                         run_again(sdata, ifmgd->probe_timeout);
3964                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3965                         mlme_dbg(sdata,
3966                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3967                                  bssid, probe_wait_ms);
3968                         ieee80211_sta_connection_lost(sdata, bssid,
3969                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3970                 } else if (ifmgd->probe_send_count < max_tries) {
3971                         mlme_dbg(sdata,
3972                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3973                                  bssid, probe_wait_ms,
3974                                  ifmgd->probe_send_count, max_tries);
3975                         ieee80211_mgd_probe_ap_send(sdata);
3976                 } else {
3977                         /*
3978                          * We actually lost the connection ... or did we?
3979                          * Let's make sure!
3980                          */
3981                         wiphy_debug(local->hw.wiphy,
3982                                     "%s: No probe response from AP %pM"
3983                                     " after %dms, disconnecting.\n",
3984                                     sdata->name,
3985                                     bssid, probe_wait_ms);
3986
3987                         ieee80211_sta_connection_lost(sdata, bssid,
3988                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3989                 }
3990         }
3991
3992         sdata_unlock(sdata);
3993 }
3994
3995 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3996 {
3997         struct ieee80211_sub_if_data *sdata =
3998                 (struct ieee80211_sub_if_data *) data;
3999         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4000
4001         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4002                 return;
4003
4004         sdata->u.mgd.connection_loss = false;
4005         ieee80211_queue_work(&sdata->local->hw,
4006                              &sdata->u.mgd.beacon_connection_loss_work);
4007 }
4008
4009 static void ieee80211_sta_conn_mon_timer(unsigned long data)
4010 {
4011         struct ieee80211_sub_if_data *sdata =
4012                 (struct ieee80211_sub_if_data *) data;
4013         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4014         struct ieee80211_local *local = sdata->local;
4015
4016         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4017                 return;
4018
4019         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4020 }
4021
4022 static void ieee80211_sta_monitor_work(struct work_struct *work)
4023 {
4024         struct ieee80211_sub_if_data *sdata =
4025                 container_of(work, struct ieee80211_sub_if_data,
4026                              u.mgd.monitor_work);
4027
4028         ieee80211_mgd_probe_ap(sdata, false);
4029 }
4030
4031 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4032 {
4033         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4034                 __ieee80211_stop_poll(sdata);
4035
4036                 /* let's probe the connection once */
4037                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4038                         ieee80211_queue_work(&sdata->local->hw,
4039                                              &sdata->u.mgd.monitor_work);
4040                 /* and do all the other regular work too */
4041                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
4042         }
4043 }
4044
4045 #ifdef CONFIG_PM
4046 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4047 {
4048         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4049         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4050
4051         sdata_lock(sdata);
4052
4053         if (ifmgd->auth_data || ifmgd->assoc_data) {
4054                 const u8 *bssid = ifmgd->auth_data ?
4055                                 ifmgd->auth_data->bss->bssid :
4056                                 ifmgd->assoc_data->bss->bssid;
4057
4058                 /*
4059                  * If we are trying to authenticate / associate while suspending,
4060                  * cfg80211 won't know and won't actually abort those attempts,
4061                  * thus we need to do that ourselves.
4062                  */
4063                 ieee80211_send_deauth_disassoc(sdata, bssid,
4064                                                IEEE80211_STYPE_DEAUTH,
4065                                                WLAN_REASON_DEAUTH_LEAVING,
4066                                                false, frame_buf);
4067                 if (ifmgd->assoc_data)
4068                         ieee80211_destroy_assoc_data(sdata, false);
4069                 if (ifmgd->auth_data)
4070                         ieee80211_destroy_auth_data(sdata, false);
4071                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4072                                       IEEE80211_DEAUTH_FRAME_LEN);
4073         }
4074
4075         /* This is a bit of a hack - we should find a better and more generic
4076          * solution to this. Normally when suspending, cfg80211 will in fact
4077          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4078          * auth (not so important) or assoc (this is the problem) process.
4079          *
4080          * As a consequence, it can happen that we are in the process of both
4081          * associating and suspending, and receive an association response
4082          * after cfg80211 has checked if it needs to disconnect, but before
4083          * we actually set the flag to drop incoming frames. This will then
4084          * cause the workqueue flush to process the association response in
4085          * the suspend, resulting in a successful association just before it
4086          * tries to remove the interface from the driver, which now though
4087          * has a channel context assigned ... this results in issues.
4088          *
4089          * To work around this (for now) simply deauth here again if we're
4090          * now connected.
4091          */
4092         if (ifmgd->associated && !sdata->local->wowlan) {
4093                 u8 bssid[ETH_ALEN];
4094                 struct cfg80211_deauth_request req = {
4095                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4096                         .bssid = bssid,
4097                 };
4098
4099                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4100                 ieee80211_mgd_deauth(sdata, &req);
4101         }
4102
4103         sdata_unlock(sdata);
4104 }
4105
4106 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4107 {
4108         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4109
4110         sdata_lock(sdata);
4111         if (!ifmgd->associated) {
4112                 sdata_unlock(sdata);
4113                 return;
4114         }
4115
4116         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4117                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4118                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4119                 ieee80211_sta_connection_lost(sdata,
4120                                               ifmgd->associated->bssid,
4121                                               WLAN_REASON_UNSPECIFIED,
4122                                               true);
4123                 sdata_unlock(sdata);
4124                 return;
4125         }
4126         sdata_unlock(sdata);
4127 }
4128 #endif
4129
4130 /* interface setup */
4131 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4132 {
4133         struct ieee80211_if_managed *ifmgd;
4134
4135         ifmgd = &sdata->u.mgd;
4136         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4137         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4138         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4139                   ieee80211_beacon_connection_loss_work);
4140         INIT_WORK(&ifmgd->csa_connection_drop_work,
4141                   ieee80211_csa_connection_drop_work);
4142         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4143         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4144                           ieee80211_tdls_peer_del_work);
4145         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4146                     (unsigned long) sdata);
4147         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4148                     (unsigned long) sdata);
4149         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4150                     (unsigned long) sdata);
4151         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4152                     (unsigned long) sdata);
4153         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4154                           ieee80211_sta_handle_tspec_ac_params_wk);
4155
4156         ifmgd->flags = 0;
4157         ifmgd->powersave = sdata->wdev.ps;
4158         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4159         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4160         ifmgd->p2p_noa_index = -1;
4161
4162         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4163                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4164         else
4165                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4166
4167         /* Setup TDLS data */
4168         spin_lock_init(&ifmgd->teardown_lock);
4169         ifmgd->teardown_skb = NULL;
4170         ifmgd->orig_teardown_skb = NULL;
4171 }
4172
4173 /* scan finished notification */
4174 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4175 {
4176         struct ieee80211_sub_if_data *sdata;
4177
4178         /* Restart STA timers */
4179         rcu_read_lock();
4180         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4181                 if (ieee80211_sdata_running(sdata))
4182                         ieee80211_restart_sta_timer(sdata);
4183         }
4184         rcu_read_unlock();
4185 }
4186
4187 int ieee80211_max_network_latency(struct notifier_block *nb,
4188                                   unsigned long data, void *dummy)
4189 {
4190         s32 latency_usec = (s32) data;
4191         struct ieee80211_local *local =
4192                 container_of(nb, struct ieee80211_local,
4193                              network_latency_notifier);
4194
4195         mutex_lock(&local->iflist_mtx);
4196         ieee80211_recalc_ps(local, latency_usec);
4197         mutex_unlock(&local->iflist_mtx);
4198
4199         return NOTIFY_OK;
4200 }
4201
4202 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4203                                      struct cfg80211_bss *cbss)
4204 {
4205         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4206         const u8 *ht_cap_ie, *vht_cap_ie;
4207         const struct ieee80211_ht_cap *ht_cap;
4208         const struct ieee80211_vht_cap *vht_cap;
4209         u8 chains = 1;
4210
4211         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4212                 return chains;
4213
4214         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4215         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4216                 ht_cap = (void *)(ht_cap_ie + 2);
4217                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4218                 /*
4219                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4220                  *       "Tx Unequal Modulation Supported" fields.
4221                  */
4222         }
4223
4224         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4225                 return chains;
4226
4227         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4228         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4229                 u8 nss;
4230                 u16 tx_mcs_map;
4231
4232                 vht_cap = (void *)(vht_cap_ie + 2);
4233                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4234                 for (nss = 8; nss > 0; nss--) {
4235                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4236                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4237                                 break;
4238                 }
4239                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4240                 chains = max(chains, nss);
4241         }
4242
4243         return chains;
4244 }
4245
4246 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4247                                   struct cfg80211_bss *cbss)
4248 {
4249         struct ieee80211_local *local = sdata->local;
4250         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4251         const struct ieee80211_ht_cap *ht_cap = NULL;
4252         const struct ieee80211_ht_operation *ht_oper = NULL;
4253         const struct ieee80211_vht_operation *vht_oper = NULL;
4254         struct ieee80211_supported_band *sband;
4255         struct cfg80211_chan_def chandef;
4256         int ret;
4257
4258         sband = local->hw.wiphy->bands[cbss->channel->band];
4259
4260         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4261                           IEEE80211_STA_DISABLE_80P80MHZ |
4262                           IEEE80211_STA_DISABLE_160MHZ);
4263
4264         rcu_read_lock();
4265
4266         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4267             sband->ht_cap.ht_supported) {
4268                 const u8 *ht_oper_ie, *ht_cap_ie;
4269
4270                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4271                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4272                         ht_oper = (void *)(ht_oper_ie + 2);
4273
4274                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4275                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4276                         ht_cap = (void *)(ht_cap_ie + 2);
4277
4278                 if (!ht_cap) {
4279                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4280                         ht_oper = NULL;
4281                 }
4282         }
4283
4284         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4285             sband->vht_cap.vht_supported) {
4286                 const u8 *vht_oper_ie, *vht_cap;
4287
4288                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4289                                                    WLAN_EID_VHT_OPERATION);
4290                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4291                         vht_oper = (void *)(vht_oper_ie + 2);
4292                 if (vht_oper && !ht_oper) {
4293                         vht_oper = NULL;
4294                         sdata_info(sdata,
4295                                    "AP advertised VHT without HT, disabling both\n");
4296                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4297                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4298                 }
4299
4300                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4301                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4302                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4303                         vht_oper = NULL;
4304                 }
4305         }
4306
4307         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4308                                                      cbss->channel,
4309                                                      ht_cap, ht_oper, vht_oper,
4310                                                      &chandef, false);
4311
4312         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4313                                       local->rx_chains);
4314
4315         rcu_read_unlock();
4316
4317         /* will change later if needed */
4318         sdata->smps_mode = IEEE80211_SMPS_OFF;
4319
4320         mutex_lock(&local->mtx);
4321         /*
4322          * If this fails (possibly due to channel context sharing
4323          * on incompatible channels, e.g. 80+80 and 160 sharing the
4324          * same control channel) try to use a smaller bandwidth.
4325          */
4326         ret = ieee80211_vif_use_channel(sdata, &chandef,
4327                                         IEEE80211_CHANCTX_SHARED);
4328
4329         /* don't downgrade for 5 and 10 MHz channels, though. */
4330         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4331             chandef.width == NL80211_CHAN_WIDTH_10)
4332                 goto out;
4333
4334         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4335                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4336                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4337                                                 IEEE80211_CHANCTX_SHARED);
4338         }
4339  out:
4340         mutex_unlock(&local->mtx);
4341         return ret;
4342 }
4343
4344 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4345                                      struct cfg80211_bss *cbss, bool assoc,
4346                                      bool override)
4347 {
4348         struct ieee80211_local *local = sdata->local;
4349         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4350         struct ieee80211_bss *bss = (void *)cbss->priv;
4351         struct sta_info *new_sta = NULL;
4352         struct ieee80211_supported_band *sband;
4353         bool have_sta = false;
4354         int err;
4355
4356         sband = local->hw.wiphy->bands[cbss->channel->band];
4357
4358         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4359                 return -EINVAL;
4360
4361         if (assoc) {
4362                 rcu_read_lock();
4363                 have_sta = sta_info_get(sdata, cbss->bssid);
4364                 rcu_read_unlock();
4365         }
4366
4367         if (!have_sta) {
4368                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4369                 if (!new_sta)
4370                         return -ENOMEM;
4371         }
4372
4373         if (new_sta || override) {
4374                 err = ieee80211_prep_channel(sdata, cbss);
4375                 if (err) {
4376                         if (new_sta)
4377                                 sta_info_free(local, new_sta);
4378                         return -EINVAL;
4379                 }
4380         }
4381
4382         if (new_sta) {
4383                 u32 rates = 0, basic_rates = 0;
4384                 bool have_higher_than_11mbit;
4385                 int min_rate = INT_MAX, min_rate_index = -1;
4386                 struct ieee80211_chanctx_conf *chanctx_conf;
4387                 const struct cfg80211_bss_ies *ies;
4388                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4389                 u32 rate_flags;
4390
4391                 rcu_read_lock();
4392                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4393                 if (WARN_ON(!chanctx_conf)) {
4394                         rcu_read_unlock();
4395                         sta_info_free(local, new_sta);
4396                         return -EINVAL;
4397                 }
4398                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4399                 rcu_read_unlock();
4400
4401                 ieee80211_get_rates(sband, bss->supp_rates,
4402                                     bss->supp_rates_len,
4403                                     &rates, &basic_rates,
4404                                     &have_higher_than_11mbit,
4405                                     &min_rate, &min_rate_index,
4406                                     shift, rate_flags);
4407
4408                 /*
4409                  * This used to be a workaround for basic rates missing
4410                  * in the association response frame. Now that we no
4411                  * longer use the basic rates from there, it probably
4412                  * doesn't happen any more, but keep the workaround so
4413                  * in case some *other* APs are buggy in different ways
4414                  * we can connect -- with a warning.
4415                  */
4416                 if (!basic_rates && min_rate_index >= 0) {
4417                         sdata_info(sdata,
4418                                    "No basic rates, using min rate instead\n");
4419                         basic_rates = BIT(min_rate_index);
4420                 }
4421
4422                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4423                 sdata->vif.bss_conf.basic_rates = basic_rates;
4424
4425                 /* cf. IEEE 802.11 9.2.12 */
4426                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4427                     have_higher_than_11mbit)
4428                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4429                 else
4430                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4431
4432                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4433
4434                 /* set timing information */
4435                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4436                 rcu_read_lock();
4437                 ies = rcu_dereference(cbss->beacon_ies);
4438                 if (ies) {
4439                         const u8 *tim_ie;
4440
4441                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4442                         sdata->vif.bss_conf.sync_device_ts =
4443                                 bss->device_ts_beacon;
4444                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4445                                                   ies->data, ies->len);
4446                         if (tim_ie && tim_ie[1] >= 2)
4447                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4448                         else
4449                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4450                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4451                                                TIMING_BEACON_ONLY)) {
4452                         ies = rcu_dereference(cbss->proberesp_ies);
4453                         /* must be non-NULL since beacon IEs were NULL */
4454                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4455                         sdata->vif.bss_conf.sync_device_ts =
4456                                 bss->device_ts_presp;
4457                         sdata->vif.bss_conf.sync_dtim_count = 0;
4458                 } else {
4459                         sdata->vif.bss_conf.sync_tsf = 0;
4460                         sdata->vif.bss_conf.sync_device_ts = 0;
4461                         sdata->vif.bss_conf.sync_dtim_count = 0;
4462                 }
4463                 rcu_read_unlock();
4464
4465                 /* tell driver about BSSID, basic rates and timing */
4466                 ieee80211_bss_info_change_notify(sdata,
4467                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4468                         BSS_CHANGED_BEACON_INT);
4469
4470                 if (assoc)
4471                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4472
4473                 err = sta_info_insert(new_sta);
4474                 new_sta = NULL;
4475                 if (err) {
4476                         sdata_info(sdata,
4477                                    "failed to insert STA entry for the AP (error %d)\n",
4478                                    err);
4479                         return err;
4480                 }
4481         } else
4482                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4483
4484         /* Cancel scan to ensure that nothing interferes with connection */
4485         if (local->scanning)
4486                 ieee80211_scan_cancel(local);
4487
4488         return 0;
4489 }
4490
4491 /* config hooks */
4492 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4493                        struct cfg80211_auth_request *req)
4494 {
4495         struct ieee80211_local *local = sdata->local;
4496         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4497         struct ieee80211_mgd_auth_data *auth_data;
4498         u16 auth_alg;
4499         int err;
4500
4501         /* prepare auth data structure */
4502
4503         switch (req->auth_type) {
4504         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4505                 auth_alg = WLAN_AUTH_OPEN;
4506                 break;
4507         case NL80211_AUTHTYPE_SHARED_KEY:
4508                 if (IS_ERR(local->wep_tx_tfm))
4509                         return -EOPNOTSUPP;
4510                 auth_alg = WLAN_AUTH_SHARED_KEY;
4511                 break;
4512         case NL80211_AUTHTYPE_FT:
4513                 auth_alg = WLAN_AUTH_FT;
4514                 break;
4515         case NL80211_AUTHTYPE_NETWORK_EAP:
4516                 auth_alg = WLAN_AUTH_LEAP;
4517                 break;
4518         case NL80211_AUTHTYPE_SAE:
4519                 auth_alg = WLAN_AUTH_SAE;
4520                 break;
4521         default:
4522                 return -EOPNOTSUPP;
4523         }
4524
4525         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4526                             req->ie_len, GFP_KERNEL);
4527         if (!auth_data)
4528                 return -ENOMEM;
4529
4530         auth_data->bss = req->bss;
4531
4532         if (req->sae_data_len >= 4) {
4533                 __le16 *pos = (__le16 *) req->sae_data;
4534                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4535                 auth_data->sae_status = le16_to_cpu(pos[1]);
4536                 memcpy(auth_data->data, req->sae_data + 4,
4537                        req->sae_data_len - 4);
4538                 auth_data->data_len += req->sae_data_len - 4;
4539         }
4540
4541         if (req->ie && req->ie_len) {
4542                 memcpy(&auth_data->data[auth_data->data_len],
4543                        req->ie, req->ie_len);
4544                 auth_data->data_len += req->ie_len;
4545         }
4546
4547         if (req->key && req->key_len) {
4548                 auth_data->key_len = req->key_len;
4549                 auth_data->key_idx = req->key_idx;
4550                 memcpy(auth_data->key, req->key, req->key_len);
4551         }
4552
4553         auth_data->algorithm = auth_alg;
4554
4555         /* try to authenticate/probe */
4556
4557         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4558             ifmgd->assoc_data) {
4559                 err = -EBUSY;
4560                 goto err_free;
4561         }
4562
4563         if (ifmgd->auth_data)
4564                 ieee80211_destroy_auth_data(sdata, false);
4565
4566         /* prep auth_data so we don't go into idle on disassoc */
4567         ifmgd->auth_data = auth_data;
4568
4569         if (ifmgd->associated) {
4570                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4571
4572                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4573                                        WLAN_REASON_UNSPECIFIED,
4574                                        false, frame_buf);
4575
4576                 ieee80211_report_disconnect(sdata, frame_buf,
4577                                             sizeof(frame_buf), true,
4578                                             WLAN_REASON_UNSPECIFIED);
4579         }
4580
4581         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4582
4583         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4584         if (err)
4585                 goto err_clear;
4586
4587         err = ieee80211_probe_auth(sdata);
4588         if (err) {
4589                 sta_info_destroy_addr(sdata, req->bss->bssid);
4590                 goto err_clear;
4591         }
4592
4593         /* hold our own reference */
4594         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4595         return 0;
4596
4597  err_clear:
4598         eth_zero_addr(ifmgd->bssid);
4599         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4600         ifmgd->auth_data = NULL;
4601         mutex_lock(&sdata->local->mtx);
4602         ieee80211_vif_release_channel(sdata);
4603         mutex_unlock(&sdata->local->mtx);
4604  err_free:
4605         kfree(auth_data);
4606         return err;
4607 }
4608
4609 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4610                                         const u8 *wmm_param, int len)
4611 {
4612         const u8 *pos;
4613         size_t left;
4614
4615         if (len < 8)
4616                 return false;
4617
4618         if (wmm_param[5] != 1 /* version */)
4619                 return false;
4620
4621         pos = wmm_param + 8;
4622         left = len - 8;
4623
4624         for (; left >= 4; left -= 4, pos += 4) {
4625                 u8 aifsn = pos[0] & 0x0f;
4626                 u8 ecwmin = pos[1] & 0x0f;
4627                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4628                 int aci = (pos[0] >> 5) & 0x03;
4629
4630                 if (aifsn < 2) {
4631                         sdata_info(sdata,
4632                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4633                                    aifsn, aci);
4634                         return false;
4635                 }
4636                 if (ecwmin > ecwmax) {
4637                         sdata_info(sdata,
4638                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4639                                    ecwmin, ecwmax, aci);
4640                         return false;
4641                 }
4642         }
4643
4644         return true;
4645 }
4646
4647 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4648                         struct cfg80211_assoc_request *req)
4649 {
4650         struct ieee80211_local *local = sdata->local;
4651         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4652         struct ieee80211_bss *bss = (void *)req->bss->priv;
4653         struct ieee80211_mgd_assoc_data *assoc_data;
4654         const struct cfg80211_bss_ies *beacon_ies;
4655         struct ieee80211_supported_band *sband;
4656         const u8 *ssidie, *ht_ie, *vht_ie;
4657         int i, err;
4658         bool override = false;
4659
4660         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4661         if (!assoc_data)
4662                 return -ENOMEM;
4663
4664         rcu_read_lock();
4665         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4666         if (!ssidie) {
4667                 rcu_read_unlock();
4668                 kfree(assoc_data);
4669                 return -EINVAL;
4670         }
4671         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4672         assoc_data->ssid_len = ssidie[1];
4673         rcu_read_unlock();
4674
4675         if (ifmgd->associated) {
4676                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4677
4678                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4679                                        WLAN_REASON_UNSPECIFIED,
4680                                        false, frame_buf);
4681
4682                 ieee80211_report_disconnect(sdata, frame_buf,
4683                                             sizeof(frame_buf), true,
4684                                             WLAN_REASON_UNSPECIFIED);
4685         }
4686
4687         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4688                 err = -EBUSY;
4689                 goto err_free;
4690         }
4691
4692         if (ifmgd->assoc_data) {
4693                 err = -EBUSY;
4694                 goto err_free;
4695         }
4696
4697         if (ifmgd->auth_data) {
4698                 bool match;
4699
4700                 /* keep sta info, bssid if matching */
4701                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4702                 ieee80211_destroy_auth_data(sdata, match);
4703         }
4704
4705         /* prepare assoc data */
4706
4707         ifmgd->beacon_crc_valid = false;
4708
4709         assoc_data->wmm = bss->wmm_used &&
4710                           (local->hw.queues >= IEEE80211_NUM_ACS);
4711         if (assoc_data->wmm) {
4712                 /* try to check validity of WMM params IE */
4713                 const struct cfg80211_bss_ies *ies;
4714                 const u8 *wp, *start, *end;
4715
4716                 rcu_read_lock();
4717                 ies = rcu_dereference(req->bss->ies);
4718                 start = ies->data;
4719                 end = start + ies->len;
4720
4721                 while (true) {
4722                         wp = cfg80211_find_vendor_ie(
4723                                 WLAN_OUI_MICROSOFT,
4724                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4725                                 start, end - start);
4726                         if (!wp)
4727                                 break;
4728                         start = wp + wp[1] + 2;
4729                         /* if this IE is too short, try the next */
4730                         if (wp[1] <= 4)
4731                                 continue;
4732                         /* if this IE is WMM params, we found what we wanted */
4733                         if (wp[6] == 1)
4734                                 break;
4735                 }
4736
4737                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4738                                                         wp[1] - 2)) {
4739                         assoc_data->wmm = false;
4740                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4741                 }
4742                 rcu_read_unlock();
4743         }
4744
4745         /*
4746          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4747          * We still associate in non-HT mode (11a/b/g) if any one of these
4748          * ciphers is configured as pairwise.
4749          * We can set this to true for non-11n hardware, that'll be checked
4750          * separately along with the peer capabilities.
4751          */
4752         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4753                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4754                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4755                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4756                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4757                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4758                         netdev_info(sdata->dev,
4759                                     "disabling HT/VHT due to WEP/TKIP use\n");
4760                 }
4761         }
4762
4763         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4764         sband = local->hw.wiphy->bands[req->bss->channel->band];
4765         if (!sband->ht_cap.ht_supported ||
4766             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4767             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4768                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4769                 if (!bss->wmm_used &&
4770                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4771                         netdev_info(sdata->dev,
4772                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4773         }
4774
4775         /* disable VHT if we don't support it or the AP doesn't use WMM */
4776         if (!sband->vht_cap.vht_supported ||
4777             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4778             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4779                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4780                 if (!bss->wmm_used &&
4781                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4782                         netdev_info(sdata->dev,
4783                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4784         }
4785
4786         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4787         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4788                sizeof(ifmgd->ht_capa_mask));
4789
4790         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4791         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4792                sizeof(ifmgd->vht_capa_mask));
4793
4794         if (req->ie && req->ie_len) {
4795                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4796                 assoc_data->ie_len = req->ie_len;
4797         }
4798
4799         assoc_data->bss = req->bss;
4800
4801         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4802                 if (ifmgd->powersave)
4803                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4804                 else
4805                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4806         } else
4807                 sdata->smps_mode = ifmgd->req_smps;
4808
4809         assoc_data->capability = req->bss->capability;
4810         assoc_data->supp_rates = bss->supp_rates;
4811         assoc_data->supp_rates_len = bss->supp_rates_len;
4812
4813         rcu_read_lock();
4814         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4815         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4816                 assoc_data->ap_ht_param =
4817                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4818         else
4819                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4820         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4821         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4822                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4823                        sizeof(struct ieee80211_vht_cap));
4824         else
4825                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4826         rcu_read_unlock();
4827
4828         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4829                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4830              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4831                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4832
4833         if (bss->wmm_used && bss->uapsd_supported &&
4834             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4835                 assoc_data->uapsd = true;
4836                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4837         } else {
4838                 assoc_data->uapsd = false;
4839                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4840         }
4841
4842         if (req->prev_bssid)
4843                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4844
4845         if (req->use_mfp) {
4846                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4847                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4848         } else {
4849                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4850                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4851         }
4852
4853         if (req->flags & ASSOC_REQ_USE_RRM)
4854                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4855         else
4856                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4857
4858         if (req->crypto.control_port)
4859                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4860         else
4861                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4862
4863         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4864         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4865         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4866                                                         sdata->vif.type);
4867
4868         /* kick off associate process */
4869
4870         ifmgd->assoc_data = assoc_data;
4871         ifmgd->dtim_period = 0;
4872         ifmgd->have_beacon = false;
4873
4874         /* override HT/VHT configuration only if the AP and we support it */
4875         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4876                 struct ieee80211_sta_ht_cap sta_ht_cap;
4877
4878                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4879                         override = true;
4880
4881                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4882                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4883
4884                 /* check for 40 MHz disable override */
4885                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4886                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4887                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4888                         override = true;
4889
4890                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4891                     req->flags & ASSOC_REQ_DISABLE_VHT)
4892                         override = true;
4893         }
4894
4895         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4896                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4897                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4898         }
4899
4900         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4901                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4902
4903         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4904         if (err)
4905                 goto err_clear;
4906
4907         rcu_read_lock();
4908         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4909
4910         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4911             !beacon_ies) {
4912                 /*
4913                  * Wait up to one beacon interval ...
4914                  * should this be more if we miss one?
4915                  */
4916                 sdata_info(sdata, "waiting for beacon from %pM\n",
4917                            ifmgd->bssid);
4918                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4919                 assoc_data->timeout_started = true;
4920                 assoc_data->need_beacon = true;
4921         } else if (beacon_ies) {
4922                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4923                                                     beacon_ies->data,
4924                                                     beacon_ies->len);
4925                 u8 dtim_count = 0;
4926
4927                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4928                         const struct ieee80211_tim_ie *tim;
4929                         tim = (void *)(tim_ie + 2);
4930                         ifmgd->dtim_period = tim->dtim_period;
4931                         dtim_count = tim->dtim_count;
4932                 }
4933                 ifmgd->have_beacon = true;
4934                 assoc_data->timeout = jiffies;
4935                 assoc_data->timeout_started = true;
4936
4937                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4938                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4939                         sdata->vif.bss_conf.sync_device_ts =
4940                                 bss->device_ts_beacon;
4941                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4942                 }
4943         } else {
4944                 assoc_data->timeout = jiffies;
4945                 assoc_data->timeout_started = true;
4946         }
4947         rcu_read_unlock();
4948
4949         run_again(sdata, assoc_data->timeout);
4950
4951         if (bss->corrupt_data) {
4952                 char *corrupt_type = "data";
4953                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4954                         if (bss->corrupt_data &
4955                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4956                                 corrupt_type = "beacon and probe response";
4957                         else
4958                                 corrupt_type = "beacon";
4959                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4960                         corrupt_type = "probe response";
4961                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4962                            corrupt_type);
4963         }
4964
4965         return 0;
4966  err_clear:
4967         eth_zero_addr(ifmgd->bssid);
4968         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4969         ifmgd->assoc_data = NULL;
4970  err_free:
4971         kfree(assoc_data);
4972         return err;
4973 }
4974
4975 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4976                          struct cfg80211_deauth_request *req)
4977 {
4978         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4979         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4980         bool tx = !req->local_state_change;
4981
4982         if (ifmgd->auth_data &&
4983             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4984                 sdata_info(sdata,
4985                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4986                            req->bssid, req->reason_code,
4987                            ieee80211_get_reason_code_string(req->reason_code));
4988
4989                 drv_mgd_prepare_tx(sdata->local, sdata);
4990                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4991                                                IEEE80211_STYPE_DEAUTH,
4992                                                req->reason_code, tx,
4993                                                frame_buf);
4994                 ieee80211_destroy_auth_data(sdata, false);
4995                 ieee80211_report_disconnect(sdata, frame_buf,
4996                                             sizeof(frame_buf), true,
4997                                             req->reason_code);
4998
4999                 return 0;
5000         }
5001
5002         if (ifmgd->associated &&
5003             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5004                 sdata_info(sdata,
5005                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
5006                            req->bssid, req->reason_code,
5007                            ieee80211_get_reason_code_string(req->reason_code));
5008
5009                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5010                                        req->reason_code, tx, frame_buf);
5011                 ieee80211_report_disconnect(sdata, frame_buf,
5012                                             sizeof(frame_buf), true,
5013                                             req->reason_code);
5014                 return 0;
5015         }
5016
5017         return -ENOTCONN;
5018 }
5019
5020 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5021                            struct cfg80211_disassoc_request *req)
5022 {
5023         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5024         u8 bssid[ETH_ALEN];
5025         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5026
5027         /*
5028          * cfg80211 should catch this ... but it's racy since
5029          * we can receive a disassoc frame, process it, hand it
5030          * to cfg80211 while that's in a locked section already
5031          * trying to tell us that the user wants to disconnect.
5032          */
5033         if (ifmgd->associated != req->bss)
5034                 return -ENOLINK;
5035
5036         sdata_info(sdata,
5037                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
5038                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5039
5040         memcpy(bssid, req->bss->bssid, ETH_ALEN);
5041         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5042                                req->reason_code, !req->local_state_change,
5043                                frame_buf);
5044
5045         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5046                                     req->reason_code);
5047
5048         return 0;
5049 }
5050
5051 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5052 {
5053         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5054
5055         /*
5056          * Make sure some work items will not run after this,
5057          * they will not do anything but might not have been
5058          * cancelled when disconnecting.
5059          */
5060         cancel_work_sync(&ifmgd->monitor_work);
5061         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5062         cancel_work_sync(&ifmgd->request_smps_work);
5063         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5064         cancel_work_sync(&ifmgd->chswitch_work);
5065         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5066
5067         sdata_lock(sdata);
5068         if (ifmgd->assoc_data) {
5069                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5070                 ieee80211_destroy_assoc_data(sdata, false);
5071                 cfg80211_assoc_timeout(sdata->dev, bss);
5072         }
5073         if (ifmgd->auth_data)
5074                 ieee80211_destroy_auth_data(sdata, false);
5075         spin_lock_bh(&ifmgd->teardown_lock);
5076         if (ifmgd->teardown_skb) {
5077                 kfree_skb(ifmgd->teardown_skb);
5078                 ifmgd->teardown_skb = NULL;
5079                 ifmgd->orig_teardown_skb = NULL;
5080         }
5081         spin_unlock_bh(&ifmgd->teardown_lock);
5082         del_timer_sync(&ifmgd->timer);
5083         sdata_unlock(sdata);
5084 }
5085
5086 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5087                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5088                                gfp_t gfp)
5089 {
5090         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5091
5092         trace_api_cqm_rssi_notify(sdata, rssi_event);
5093
5094         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5095 }
5096 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5097
5098 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5099 {
5100         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5101
5102         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5103
5104         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5105 }
5106 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);