net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/pm_qos.h>
  23 #include <linux/crc32.h>
  24 #include <linux/slab.h>
  25 #include <linux/export.h>
  26 #include <net/mac80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "led.h"
  33
  34 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  35 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  36 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  37 #define IEEE80211_AUTH_MAX_TRIES        3
  38 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  39 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  40 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  41 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  42 #define IEEE80211_ASSOC_MAX_TRIES       3
  43
  44 static int max_nullfunc_tries = 2;
  45 module_param(max_nullfunc_tries, int, 0644);
  46 MODULE_PARM_DESC(max_nullfunc_tries,
  47                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  48
  49 static int max_probe_tries = 5;
  50 module_param(max_probe_tries, int, 0644);
  51 MODULE_PARM_DESC(max_probe_tries,
  52                  "Maximum probe tries before disconnecting (reason 4).");
  53
  54 /*
  55  * Beacon loss timeout is calculated as N frames times the
  56  * advertised beacon interval.  This may need to be somewhat
  57  * higher than what hardware might detect to account for
  58  * delays in the host processing frames. But since we also
  59  * probe on beacon miss before declaring the connection lost
  60  * default to what we want.
  61  */
  62 static int beacon_loss_count = 7;
  63 module_param(beacon_loss_count, int, 0644);
  64 MODULE_PARM_DESC(beacon_loss_count,
  65                  "Number of beacon intervals before we decide beacon was lost.");
  66
  67 /*
  68  * Time the connection can be idle before we probe
  69  * it to see if we can still talk to the AP.
  70  */
  71 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  72 /*
  73  * Time we wait for a probe response after sending
  74  * a probe request because of beacon loss or for
  75  * checking the connection still works.
  76  */
  77 static int probe_wait_ms = 500;
  78 module_param(probe_wait_ms, int, 0644);
  79 MODULE_PARM_DESC(probe_wait_ms,
  80                  "Maximum time(ms) to wait for probe response"
  81                  " before disconnecting (reason 4).");
  82
  83 /*
  84  * Weight given to the latest Beacon frame when calculating average signal
  85  * strength for Beacon frames received in the current BSS. This must be
  86  * between 1 and 15.
  87  */
  88 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  89
  90 /*
  91  * How many Beacon frames need to have been used in average signal strength
  92  * before starting to indicate signal change events.
  93  */
  94 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  95
  96 /*
  97  * We can have multiple work items (and connection probing)
  98  * scheduling this timer, but we need to take care to only
  99  * reschedule it when it should fire _earlier_ than it was
 100  * asked for before, or if it's not pending right now. This
 101  * function ensures that. Note that it then is required to
 102  * run this function for all timeouts after the first one
 103  * has happened -- the work that runs from this timer will
 104  * do that.
 105  */
 106 static void run_again(struct ieee80211_sub_if_data *sdata,
 107                       unsigned long timeout)
 108 {
 109         sdata_assert_lock(sdata);
 110
 111         if (!timer_pending(&sdata->u.mgd.timer) ||
 112             time_before(timeout, sdata->u.mgd.timer.expires))
 113                 mod_timer(&sdata->u.mgd.timer, timeout);
 114 }
 115
 116 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 117 {
 118         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 119                 return;
 120
 121         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 122                 return;
 123
 124         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 125                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 126 }
 127
 128 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 129 {
 130         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 131
 132         if (unlikely(!sdata->u.mgd.associated))
 133                 return;
 134
 135         ifmgd->probe_send_count = 0;
 136
 137         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 138                 return;
 139
 140         mod_timer(&sdata->u.mgd.conn_mon_timer,
 141                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 142 }
 143
 144 static int ecw2cw(int ecw)
 145 {
 146         return (1 << ecw) - 1;
 147 }
 148
 149 static u32
 150 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 151                              struct ieee80211_supported_band *sband,
 152                              struct ieee80211_channel *channel,
 153                              const struct ieee80211_ht_cap *ht_cap,
 154                              const struct ieee80211_ht_operation *ht_oper,
 155                              const struct ieee80211_vht_operation *vht_oper,
 156                              struct cfg80211_chan_def *chandef, bool tracking)
 157 {
 158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 159         struct cfg80211_chan_def vht_chandef;
 160         struct ieee80211_sta_ht_cap sta_ht_cap;
 161         u32 ht_cfreq, ret;
 162
 163         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 164         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 165
 166         chandef->chan = channel;
 167         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 168         chandef->center_freq1 = channel->center_freq;
 169         chandef->center_freq2 = 0;
 170
 171         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 172                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 173                 goto out;
 174         }
 175
 176         chandef->width = NL80211_CHAN_WIDTH_20;
 177
 178         if (!(ht_cap->cap_info &
 179               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 180                 ret = IEEE80211_STA_DISABLE_40MHZ;
 181                 vht_chandef = *chandef;
 182                 goto out;
 183         }
 184
 185         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 186                                                   channel->band);
 187         /* check that channel matches the right operating channel */
 188         if (!tracking && channel->center_freq != ht_cfreq) {
 189                 /*
 190                  * It's possible that some APs are confused here;
 191                  * Netgear WNDR3700 sometimes reports 4 higher than
 192                  * the actual channel in association responses, but
 193                  * since we look at probe response/beacon data here
 194                  * it should be OK.
 195                  */
 196                 sdata_info(sdata,
 197                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 198                            channel->center_freq, ht_cfreq,
 199                            ht_oper->primary_chan, channel->band);
 200                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 201                 goto out;
 202         }
 203
 204         /* check 40 MHz support, if we have it */
 205         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 206                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 207                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 208                         chandef->width = NL80211_CHAN_WIDTH_40;
 209                         chandef->center_freq1 += 10;
 210                         break;
 211                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 212                         chandef->width = NL80211_CHAN_WIDTH_40;
 213                         chandef->center_freq1 -= 10;
 214                         break;
 215                 }
 216         } else {
 217                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 218                 ret = IEEE80211_STA_DISABLE_VHT;
 219                 /* also mark 40 MHz disabled */
 220                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 221                 goto out;
 222         }
 223
 224         if (!vht_oper || !sband->vht_cap.vht_supported) {
 225                 ret = IEEE80211_STA_DISABLE_VHT;
 226                 goto out;
 227         }
 228
 229         vht_chandef.chan = channel;
 230         vht_chandef.center_freq1 =
 231                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 232                                                channel->band);
 233         vht_chandef.center_freq2 = 0;
 234
 235         switch (vht_oper->chan_width) {
 236         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 237                 vht_chandef.width = chandef->width;
 238                 vht_chandef.center_freq1 = chandef->center_freq1;
 239                 break;
 240         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 241                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 242                 break;
 243         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 244                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 245                 break;
 246         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 247                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 248                 vht_chandef.center_freq2 =
 249                         ieee80211_channel_to_frequency(
 250                                 vht_oper->center_freq_seg2_idx,
 251                                 channel->band);
 252                 break;
 253         default:
 254                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 255                         sdata_info(sdata,
 256                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 257                                    vht_oper->chan_width);
 258                 ret = IEEE80211_STA_DISABLE_VHT;
 259                 goto out;
 260         }
 261
 262         if (!cfg80211_chandef_valid(&vht_chandef)) {
 263                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 264                         sdata_info(sdata,
 265                                    "AP VHT information is invalid, disable VHT\n");
 266                 ret = IEEE80211_STA_DISABLE_VHT;
 267                 goto out;
 268         }
 269
 270         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 271                 ret = 0;
 272                 goto out;
 273         }
 274
 275         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 276                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 277                         sdata_info(sdata,
 278                                    "AP VHT information doesn't match HT, disable VHT\n");
 279                 ret = IEEE80211_STA_DISABLE_VHT;
 280                 goto out;
 281         }
 282
 283         *chandef = vht_chandef;
 284
 285         ret = 0;
 286
 287 out:
 288         /*
 289          * When tracking the current AP, don't do any further checks if the
 290          * new chandef is identical to the one we're currently using for the
 291          * connection. This keeps us from playing ping-pong with regulatory,
 292          * without it the following can happen (for example):
 293          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 294          *  - AP advertises regdom US
 295          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 296          *  - the code below detects an unsupported channel, downgrades, and
 297          *    we disconnect from the AP in the caller
 298          *  - disconnect causes CRDA to reload world regdomain and the game
 299          *    starts anew.
 300          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 301          *
 302          * It seems possible that there are still scenarios with CSA or real
 303          * bandwidth changes where a this could happen, but those cases are
 304          * less common and wouldn't completely prevent using the AP.
 305          */
 306         if (tracking &&
 307             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 308                 return ret;
 309
 310         /* don't print the message below for VHT mismatch if VHT is disabled */
 311         if (ret & IEEE80211_STA_DISABLE_VHT)
 312                 vht_chandef = *chandef;
 313
 314         /*
 315          * Ignore the DISABLED flag when we're already connected and only
 316          * tracking the APs beacon for bandwidth changes - otherwise we
 317          * might get disconnected here if we connect to an AP, update our
 318          * regulatory information based on the AP's country IE and the
 319          * information we have is wrong/outdated and disables the channel
 320          * that we're actually using for the connection to the AP.
 321          */
 322         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 323                                         tracking ? 0 :
 324                                                    IEEE80211_CHAN_DISABLED)) {
 325                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 326                         ret = IEEE80211_STA_DISABLE_HT |
 327                               IEEE80211_STA_DISABLE_VHT;
 328                         break;
 329                 }
 330
 331                 ret |= ieee80211_chandef_downgrade(chandef);
 332         }
 333
 334         if (chandef->width != vht_chandef.width && !tracking)
 335                 sdata_info(sdata,
 336                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 337
 338         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 339         return ret;
 340 }
 341
 342 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 343                                struct sta_info *sta,
 344                                const struct ieee80211_ht_cap *ht_cap,
 345                                const struct ieee80211_ht_operation *ht_oper,
 346                                const struct ieee80211_vht_operation *vht_oper,
 347                                const u8 *bssid, u32 *changed)
 348 {
 349         struct ieee80211_local *local = sdata->local;
 350         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 351         struct ieee80211_supported_band *sband;
 352         struct ieee80211_channel *chan;
 353         struct cfg80211_chan_def chandef;
 354         u16 ht_opmode;
 355         u32 flags;
 356         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 357         int ret;
 358
 359         /* if HT was/is disabled, don't track any bandwidth changes */
 360         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 361                 return 0;
 362
 363         /* don't check VHT if we associated as non-VHT station */
 364         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 365                 vht_oper = NULL;
 366
 367         if (WARN_ON_ONCE(!sta))
 368                 return -EINVAL;
 369
 370         /*
 371          * if bss configuration changed store the new one -
 372          * this may be applicable even if channel is identical
 373          */
 374         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 375         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 376                 *changed |= BSS_CHANGED_HT;
 377                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 378         }
 379
 380         chan = sdata->vif.bss_conf.chandef.chan;
 381         sband = local->hw.wiphy->bands[chan->band];
 382
 383         /* calculate new channel (type) based on HT/VHT operation IEs */
 384         flags = ieee80211_determine_chantype(sdata, sband, chan,
 385                                              ht_cap, ht_oper, vht_oper,
 386                                              &chandef, true);
 387
 388         /*
 389          * Downgrade the new channel if we associated with restricted
 390          * capabilities. For example, if we associated as a 20 MHz STA
 391          * to a 40 MHz AP (due to regulatory, capabilities or config
 392          * reasons) then switching to a 40 MHz channel now won't do us
 393          * any good -- we couldn't use it with the AP.
 394          */
 395         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 396             chandef.width == NL80211_CHAN_WIDTH_80P80)
 397                 flags |= ieee80211_chandef_downgrade(&chandef);
 398         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 399             chandef.width == NL80211_CHAN_WIDTH_160)
 400                 flags |= ieee80211_chandef_downgrade(&chandef);
 401         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 402             chandef.width > NL80211_CHAN_WIDTH_20)
 403                 flags |= ieee80211_chandef_downgrade(&chandef);
 404
 405         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 406                 return 0;
 407
 408         sdata_info(sdata,
 409                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 410                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 411                    chandef.center_freq1, chandef.center_freq2);
 412
 413         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 414                                       IEEE80211_STA_DISABLE_VHT |
 415                                       IEEE80211_STA_DISABLE_40MHZ |
 416                                       IEEE80211_STA_DISABLE_80P80MHZ |
 417                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 418             !cfg80211_chandef_valid(&chandef)) {
 419                 sdata_info(sdata,
 420                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 421                            ifmgd->bssid);
 422                 return -EINVAL;
 423         }
 424
 425         switch (chandef.width) {
 426         case NL80211_CHAN_WIDTH_20_NOHT:
 427         case NL80211_CHAN_WIDTH_20:
 428                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 429                 break;
 430         case NL80211_CHAN_WIDTH_40:
 431                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 432                 break;
 433         case NL80211_CHAN_WIDTH_80:
 434                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 435                 break;
 436         case NL80211_CHAN_WIDTH_80P80:
 437         case NL80211_CHAN_WIDTH_160:
 438                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 439                 break;
 440         default:
 441                 return -EINVAL;
 442         }
 443
 444         if (new_sta_bw > sta->cur_max_bandwidth)
 445                 new_sta_bw = sta->cur_max_bandwidth;
 446
 447         if (new_sta_bw < sta->sta.bandwidth) {
 448                 sta->sta.bandwidth = new_sta_bw;
 449                 rate_control_rate_update(local, sband, sta,
 450                                          IEEE80211_RC_BW_CHANGED);
 451         }
 452
 453         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 454         if (ret) {
 455                 sdata_info(sdata,
 456                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 457                            ifmgd->bssid);
 458                 return ret;
 459         }
 460
 461         if (new_sta_bw > sta->sta.bandwidth) {
 462                 sta->sta.bandwidth = new_sta_bw;
 463                 rate_control_rate_update(local, sband, sta,
 464                                          IEEE80211_RC_BW_CHANGED);
 465         }
 466
 467         return 0;
 468 }
 469
 470 /* frame sending functions */
 471
 472 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 473                                 struct sk_buff *skb, u8 ap_ht_param,
 474                                 struct ieee80211_supported_band *sband,
 475                                 struct ieee80211_channel *channel,
 476                                 enum ieee80211_smps_mode smps)
 477 {
 478         u8 *pos;
 479         u32 flags = channel->flags;
 480         u16 cap;
 481         struct ieee80211_sta_ht_cap ht_cap;
 482
 483         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 484
 485         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 486         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 487
 488         /* determine capability flags */
 489         cap = ht_cap.cap;
 490
 491         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 492         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 493                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 494                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 495                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 496                 }
 497                 break;
 498         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 499                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 500                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 501                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 502                 }
 503                 break;
 504         }
 505
 506         /*
 507          * If 40 MHz was disabled associate as though we weren't
 508          * capable of 40 MHz -- some broken APs will never fall
 509          * back to trying to transmit in 20 MHz.
 510          */
 511         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 512                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 513                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 514         }
 515
 516         /* set SM PS mode properly */
 517         cap &= ~IEEE80211_HT_CAP_SM_PS;
 518         switch (smps) {
 519         case IEEE80211_SMPS_AUTOMATIC:
 520         case IEEE80211_SMPS_NUM_MODES:
 521                 WARN_ON(1);
 522         case IEEE80211_SMPS_OFF:
 523                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 524                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 525                 break;
 526         case IEEE80211_SMPS_STATIC:
 527                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 528                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 529                 break;
 530         case IEEE80211_SMPS_DYNAMIC:
 531                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 532                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 533                 break;
 534         }
 535
 536         /* reserve and fill IE */
 537         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 538         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 539 }
 540
 541 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 542                                  struct sk_buff *skb,
 543                                  struct ieee80211_supported_band *sband,
 544                                  struct ieee80211_vht_cap *ap_vht_cap)
 545 {
 546         u8 *pos;
 547         u32 cap;
 548         struct ieee80211_sta_vht_cap vht_cap;
 549         u32 mask, ap_bf_sts, our_bf_sts;
 550
 551         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 552
 553         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 554         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 555
 556         /* determine capability flags */
 557         cap = vht_cap.cap;
 558
 559         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 560                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 561
 562                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 563                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 564                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 565                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 566         }
 567
 568         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 569                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 570                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 571         }
 572
 573         /*
 574          * Some APs apparently get confused if our capabilities are better
 575          * than theirs, so restrict what we advertise in the assoc request.
 576          */
 577         if (!(ap_vht_cap->vht_cap_info &
 578                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 579                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 580
 581         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 582
 583         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 584         our_bf_sts = cap & mask;
 585
 586         if (ap_bf_sts < our_bf_sts) {
 587                 cap &= ~mask;
 588                 cap |= ap_bf_sts;
 589         }
 590
 591         /* reserve and fill IE */
 592         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 593         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 594 }
 595
 596 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 597 {
 598         struct ieee80211_local *local = sdata->local;
 599         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 600         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 601         struct sk_buff *skb;
 602         struct ieee80211_mgmt *mgmt;
 603         u8 *pos, qos_info;
 604         size_t offset = 0, noffset;
 605         int i, count, rates_len, supp_rates_len, shift;
 606         u16 capab;
 607         struct ieee80211_supported_band *sband;
 608         struct ieee80211_chanctx_conf *chanctx_conf;
 609         struct ieee80211_channel *chan;
 610         u32 rate_flags, rates = 0;
 611
 612         sdata_assert_lock(sdata);
 613
 614         rcu_read_lock();
 615         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 616         if (WARN_ON(!chanctx_conf)) {
 617                 rcu_read_unlock();
 618                 return;
 619         }
 620         chan = chanctx_conf->def.chan;
 621         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 622         rcu_read_unlock();
 623         sband = local->hw.wiphy->bands[chan->band];
 624         shift = ieee80211_vif_get_shift(&sdata->vif);
 625
 626         if (assoc_data->supp_rates_len) {
 627                 /*
 628                  * Get all rates supported by the device and the AP as
 629                  * some APs don't like getting a superset of their rates
 630                  * in the association request (e.g. D-Link DAP 1353 in
 631                  * b-only mode)...
 632                  */
 633                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 634                                                      assoc_data->supp_rates,
 635                                                      assoc_data->supp_rates_len,
 636                                                      &rates);
 637         } else {
 638                 /*
 639                  * In case AP not provide any supported rates information
 640                  * before association, we send information element(s) with
 641                  * all rates that we support.
 642                  */
 643                 rates_len = 0;
 644                 for (i = 0; i < sband->n_bitrates; i++) {
 645                         if ((rate_flags & sband->bitrates[i].flags)
 646                             != rate_flags)
 647                                 continue;
 648                         rates |= BIT(i);
 649                         rates_len++;
 650                 }
 651         }
 652
 653         skb = alloc_skb(local->hw.extra_tx_headroom +
 654                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 655                         2 + assoc_data->ssid_len + /* SSID */
 656                         4 + rates_len + /* (extended) rates */
 657                         4 + /* power capability */
 658                         2 + 2 * sband->n_channels + /* supported channels */
 659                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 660                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 661                         assoc_data->ie_len + /* extra IEs */
 662                         9, /* WMM */
 663                         GFP_KERNEL);
 664         if (!skb)
 665                 return;
 666
 667         skb_reserve(skb, local->hw.extra_tx_headroom);
 668
 669         capab = WLAN_CAPABILITY_ESS;
 670
 671         if (sband->band == IEEE80211_BAND_2GHZ) {
 672                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 673                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 674                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 675                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 676         }
 677
 678         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 679                 capab |= WLAN_CAPABILITY_PRIVACY;
 680
 681         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 682             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 683                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 684
 685         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 686                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 687
 688         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 689         memset(mgmt, 0, 24);
 690         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 691         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 692         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 693
 694         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 695                 skb_put(skb, 10);
 696                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 697                                                   IEEE80211_STYPE_REASSOC_REQ);
 698                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 699                 mgmt->u.reassoc_req.listen_interval =
 700                                 cpu_to_le16(local->hw.conf.listen_interval);
 701                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 702                        ETH_ALEN);
 703         } else {
 704                 skb_put(skb, 4);
 705                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 706                                                   IEEE80211_STYPE_ASSOC_REQ);
 707                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 708                 mgmt->u.assoc_req.listen_interval =
 709                                 cpu_to_le16(local->hw.conf.listen_interval);
 710         }
 711
 712         /* SSID */
 713         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 714         *pos++ = WLAN_EID_SSID;
 715         *pos++ = assoc_data->ssid_len;
 716         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 717
 718         /* add all rates which were marked to be used above */
 719         supp_rates_len = rates_len;
 720         if (supp_rates_len > 8)
 721                 supp_rates_len = 8;
 722
 723         pos = skb_put(skb, supp_rates_len + 2);
 724         *pos++ = WLAN_EID_SUPP_RATES;
 725         *pos++ = supp_rates_len;
 726
 727         count = 0;
 728         for (i = 0; i < sband->n_bitrates; i++) {
 729                 if (BIT(i) & rates) {
 730                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 731                                                 5 * (1 << shift));
 732                         *pos++ = (u8) rate;
 733                         if (++count == 8)
 734                                 break;
 735                 }
 736         }
 737
 738         if (rates_len > count) {
 739                 pos = skb_put(skb, rates_len - count + 2);
 740                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 741                 *pos++ = rates_len - count;
 742
 743                 for (i++; i < sband->n_bitrates; i++) {
 744                         if (BIT(i) & rates) {
 745                                 int rate;
 746                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 747                                                     5 * (1 << shift));
 748                                 *pos++ = (u8) rate;
 749                         }
 750                 }
 751         }
 752
 753         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 754             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 755                 pos = skb_put(skb, 4);
 756                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 757                 *pos++ = 2;
 758                 *pos++ = 0; /* min tx power */
 759                  /* max tx power */
 760                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 761         }
 762
 763         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 764                 /* TODO: get this in reg domain format */
 765                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 766                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 767                 *pos++ = 2 * sband->n_channels;
 768                 for (i = 0; i < sband->n_channels; i++) {
 769                         *pos++ = ieee80211_frequency_to_channel(
 770                                         sband->channels[i].center_freq);
 771                         *pos++ = 1; /* one channel in the subband*/
 772                 }
 773         }
 774
 775         /* if present, add any custom IEs that go before HT */
 776         if (assoc_data->ie_len) {
 777                 static const u8 before_ht[] = {
 778                         WLAN_EID_SSID,
 779                         WLAN_EID_SUPP_RATES,
 780                         WLAN_EID_EXT_SUPP_RATES,
 781                         WLAN_EID_PWR_CAPABILITY,
 782                         WLAN_EID_SUPPORTED_CHANNELS,
 783                         WLAN_EID_RSN,
 784                         WLAN_EID_QOS_CAPA,
 785                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 786                         WLAN_EID_MOBILITY_DOMAIN,
 787                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 788                         WLAN_EID_RIC_DATA,              /* reassoc only */
 789                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 790                 };
 791                 static const u8 after_ric[] = {
 792                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 793                         WLAN_EID_HT_CAPABILITY,
 794                         WLAN_EID_BSS_COEX_2040,
 795                         WLAN_EID_EXT_CAPABILITY,
 796                         WLAN_EID_QOS_TRAFFIC_CAPA,
 797                         WLAN_EID_TIM_BCAST_REQ,
 798                         WLAN_EID_INTERWORKING,
 799                         /* 60GHz doesn't happen right now */
 800                         WLAN_EID_VHT_CAPABILITY,
 801                         WLAN_EID_OPMODE_NOTIF,
 802                 };
 803
 804                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 805                                                  assoc_data->ie_len,
 806                                                  before_ht,
 807                                                  ARRAY_SIZE(before_ht),
 808                                                  after_ric,
 809                                                  ARRAY_SIZE(after_ric),
 810                                                  offset);
 811                 pos = skb_put(skb, noffset - offset);
 812                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 813                 offset = noffset;
 814         }
 815
 816         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 817                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 818                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 819
 820         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 821                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 822                                     sband, chan, sdata->smps_mode);
 823
 824         /* if present, add any custom IEs that go before VHT */
 825         if (assoc_data->ie_len) {
 826                 static const u8 before_vht[] = {
 827                         WLAN_EID_SSID,
 828                         WLAN_EID_SUPP_RATES,
 829                         WLAN_EID_EXT_SUPP_RATES,
 830                         WLAN_EID_PWR_CAPABILITY,
 831                         WLAN_EID_SUPPORTED_CHANNELS,
 832                         WLAN_EID_RSN,
 833                         WLAN_EID_QOS_CAPA,
 834                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 835                         WLAN_EID_MOBILITY_DOMAIN,
 836                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 837                         WLAN_EID_HT_CAPABILITY,
 838                         WLAN_EID_BSS_COEX_2040,
 839                         WLAN_EID_EXT_CAPABILITY,
 840                         WLAN_EID_QOS_TRAFFIC_CAPA,
 841                         WLAN_EID_TIM_BCAST_REQ,
 842                         WLAN_EID_INTERWORKING,
 843                 };
 844
 845                 /* RIC already taken above, so no need to handle here anymore */
 846                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 847                                              before_vht, ARRAY_SIZE(before_vht),
 848                                              offset);
 849                 pos = skb_put(skb, noffset - offset);
 850                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 851                 offset = noffset;
 852         }
 853
 854         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 855                 ieee80211_add_vht_ie(sdata, skb, sband,
 856                                      &assoc_data->ap_vht_cap);
 857
 858         /* if present, add any custom non-vendor IEs that go after HT */
 859         if (assoc_data->ie_len) {
 860                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 861                                                     assoc_data->ie_len,
 862                                                     offset);
 863                 pos = skb_put(skb, noffset - offset);
 864                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 865                 offset = noffset;
 866         }
 867
 868         if (assoc_data->wmm) {
 869                 if (assoc_data->uapsd) {
 870                         qos_info = ifmgd->uapsd_queues;
 871                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 872                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 873                 } else {
 874                         qos_info = 0;
 875                 }
 876
 877                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 878         }
 879
 880         /* add any remaining custom (i.e. vendor specific here) IEs */
 881         if (assoc_data->ie_len) {
 882                 noffset = assoc_data->ie_len;
 883                 pos = skb_put(skb, noffset - offset);
 884                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 885         }
 886
 887         drv_mgd_prepare_tx(local, sdata);
 888
 889         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 890         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 891                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 892                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 893         ieee80211_tx_skb(sdata, skb);
 894 }
 895
 896 void ieee80211_send_pspoll(struct ieee80211_local *local,
 897                            struct ieee80211_sub_if_data *sdata)
 898 {
 899         struct ieee80211_pspoll *pspoll;
 900         struct sk_buff *skb;
 901
 902         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 903         if (!skb)
 904                 return;
 905
 906         pspoll = (struct ieee80211_pspoll *) skb->data;
 907         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 908
 909         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 910         ieee80211_tx_skb(sdata, skb);
 911 }
 912
 913 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 914                              struct ieee80211_sub_if_data *sdata,
 915                              int powersave)
 916 {
 917         struct sk_buff *skb;
 918         struct ieee80211_hdr_3addr *nullfunc;
 919         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 920
 921         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 922         if (!skb)
 923                 return;
 924
 925         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 926         if (powersave)
 927                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 928
 929         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 930                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 931
 932         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 933                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 934
 935         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 936                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 937
 938         ieee80211_tx_skb(sdata, skb);
 939 }
 940
 941 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 942                                           struct ieee80211_sub_if_data *sdata)
 943 {
 944         struct sk_buff *skb;
 945         struct ieee80211_hdr *nullfunc;
 946         __le16 fc;
 947
 948         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 949                 return;
 950
 951         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 952         if (!skb)
 953                 return;
 954
 955         skb_reserve(skb, local->hw.extra_tx_headroom);
 956
 957         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 958         memset(nullfunc, 0, 30);
 959         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 960                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 961         nullfunc->frame_control = fc;
 962         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 963         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 964         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 965         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 966
 967         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 968         ieee80211_tx_skb(sdata, skb);
 969 }
 970
 971 /* spectrum management related things */
 972 static void ieee80211_chswitch_work(struct work_struct *work)
 973 {
 974         struct ieee80211_sub_if_data *sdata =
 975                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 976         struct ieee80211_local *local = sdata->local;
 977         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 978         int ret;
 979
 980         if (!ieee80211_sdata_running(sdata))
 981                 return;
 982
 983         sdata_lock(sdata);
 984         mutex_lock(&local->mtx);
 985         mutex_lock(&local->chanctx_mtx);
 986
 987         if (!ifmgd->associated)
 988                 goto out;
 989
 990         if (!sdata->vif.csa_active)
 991                 goto out;
 992
 993         /*
 994          * using reservation isn't immediate as it may be deferred until later
 995          * with multi-vif. once reservation is complete it will re-schedule the
 996          * work with no reserved_chanctx so verify chandef to check if it
 997          * completed successfully
 998          */
 999
1000         if (sdata->reserved_chanctx) {
1001                 /*
1002                  * with multi-vif csa driver may call ieee80211_csa_finish()
1003                  * many times while waiting for other interfaces to use their
1004                  * reservations
1005                  */
1006                 if (sdata->reserved_ready)
1007                         goto out;
1008
1009                 ret = ieee80211_vif_use_reserved_context(sdata);
1010                 if (ret) {
1011                         sdata_info(sdata,
1012                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1013                                    ret);
1014                         ieee80211_queue_work(&sdata->local->hw,
1015                                              &ifmgd->csa_connection_drop_work);
1016                         goto out;
1017                 }
1018
1019                 goto out;
1020         }
1021
1022         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1023                                         &sdata->csa_chandef)) {
1024                 sdata_info(sdata,
1025                            "failed to finalize channel switch, disconnecting\n");
1026                 ieee80211_queue_work(&sdata->local->hw,
1027                                      &ifmgd->csa_connection_drop_work);
1028                 goto out;
1029         }
1030
1031         /* XXX: shouldn't really modify cfg80211-owned data! */
1032         ifmgd->associated->channel = sdata->csa_chandef.chan;
1033
1034         ifmgd->csa_waiting_bcn = true;
1035
1036         ieee80211_sta_reset_beacon_monitor(sdata);
1037         ieee80211_sta_reset_conn_monitor(sdata);
1038
1039 out:
1040         mutex_unlock(&local->chanctx_mtx);
1041         mutex_unlock(&local->mtx);
1042         sdata_unlock(sdata);
1043 }
1044
1045 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1046 {
1047         struct ieee80211_local *local = sdata->local;
1048         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1049         int ret;
1050
1051         sdata_assert_lock(sdata);
1052
1053         WARN_ON(!sdata->vif.csa_active);
1054
1055         if (sdata->csa_block_tx) {
1056                 ieee80211_wake_vif_queues(local, sdata,
1057                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1058                 sdata->csa_block_tx = false;
1059         }
1060
1061         sdata->vif.csa_active = false;
1062         ifmgd->csa_waiting_bcn = false;
1063
1064         ret = drv_post_channel_switch(sdata);
1065         if (ret) {
1066                 sdata_info(sdata,
1067                            "driver post channel switch failed, disconnecting\n");
1068                 ieee80211_queue_work(&local->hw,
1069                                      &ifmgd->csa_connection_drop_work);
1070                 return;
1071         }
1072
1073         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1074 }
1075
1076 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1077 {
1078         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1079         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1080
1081         trace_api_chswitch_done(sdata, success);
1082         if (!success) {
1083                 sdata_info(sdata,
1084                            "driver channel switch failed, disconnecting\n");
1085                 ieee80211_queue_work(&sdata->local->hw,
1086                                      &ifmgd->csa_connection_drop_work);
1087         } else {
1088                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1089         }
1090 }
1091 EXPORT_SYMBOL(ieee80211_chswitch_done);
1092
1093 static void ieee80211_chswitch_timer(unsigned long data)
1094 {
1095         struct ieee80211_sub_if_data *sdata =
1096                 (struct ieee80211_sub_if_data *) data;
1097
1098         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1099 }
1100
1101 static void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata)
1102 {
1103         struct sta_info *sta;
1104         u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED;
1105
1106         rcu_read_lock();
1107         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
1108                 if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded ||
1109                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1110                         continue;
1111
1112                 ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr,
1113                                             NL80211_TDLS_TEARDOWN, reason,
1114                                             GFP_ATOMIC);
1115         }
1116         rcu_read_unlock();
1117 }
1118
1119 static void
1120 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1121                                  u64 timestamp, u32 device_timestamp,
1122                                  struct ieee802_11_elems *elems,
1123                                  bool beacon)
1124 {
1125         struct ieee80211_local *local = sdata->local;
1126         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1127         struct cfg80211_bss *cbss = ifmgd->associated;
1128         struct ieee80211_chanctx_conf *conf;
1129         struct ieee80211_chanctx *chanctx;
1130         enum ieee80211_band current_band;
1131         struct ieee80211_csa_ie csa_ie;
1132         struct ieee80211_channel_switch ch_switch;
1133         int res;
1134
1135         sdata_assert_lock(sdata);
1136
1137         if (!cbss)
1138                 return;
1139
1140         if (local->scanning)
1141                 return;
1142
1143         /* disregard subsequent announcements if we are already processing */
1144         if (sdata->vif.csa_active)
1145                 return;
1146
1147         current_band = cbss->channel->band;
1148         memset(&csa_ie, 0, sizeof(csa_ie));
1149         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1150                                            ifmgd->flags,
1151                                            ifmgd->associated->bssid, &csa_ie);
1152         if (res < 0)
1153                 ieee80211_queue_work(&local->hw,
1154                                      &ifmgd->csa_connection_drop_work);
1155         if (res)
1156                 return;
1157
1158         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1159                                      IEEE80211_CHAN_DISABLED)) {
1160                 sdata_info(sdata,
1161                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1162                            ifmgd->associated->bssid,
1163                            csa_ie.chandef.chan->center_freq,
1164                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1165                            csa_ie.chandef.center_freq2);
1166                 ieee80211_queue_work(&local->hw,
1167                                      &ifmgd->csa_connection_drop_work);
1168                 return;
1169         }
1170
1171         if (cfg80211_chandef_identical(&csa_ie.chandef,
1172                                        &sdata->vif.bss_conf.chandef)) {
1173                 if (ifmgd->csa_ignored_same_chan)
1174                         return;
1175                 sdata_info(sdata,
1176                            "AP %pM tries to chanswitch to same channel, ignore\n",
1177                            ifmgd->associated->bssid);
1178                 ifmgd->csa_ignored_same_chan = true;
1179                 return;
1180         }
1181
1182         /*
1183          * Drop all TDLS peers - either we disconnect or move to a different
1184          * channel from this point on. There's no telling what our peer will do.
1185          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1186          * have an incompatible wider chandef.
1187          */
1188         ieee80211_teardown_tdls_peers(sdata);
1189
1190         mutex_lock(&local->mtx);
1191         mutex_lock(&local->chanctx_mtx);
1192         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1193                                          lockdep_is_held(&local->chanctx_mtx));
1194         if (!conf) {
1195                 sdata_info(sdata,
1196                            "no channel context assigned to vif?, disconnecting\n");
1197                 goto drop_connection;
1198         }
1199
1200         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1201
1202         if (local->use_chanctx &&
1203             !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1204                 sdata_info(sdata,
1205                            "driver doesn't support chan-switch with channel contexts\n");
1206                 goto drop_connection;
1207         }
1208
1209         ch_switch.timestamp = timestamp;
1210         ch_switch.device_timestamp = device_timestamp;
1211         ch_switch.block_tx = csa_ie.mode;
1212         ch_switch.chandef = csa_ie.chandef;
1213         ch_switch.count = csa_ie.count;
1214
1215         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1216                 sdata_info(sdata,
1217                            "preparing for channel switch failed, disconnecting\n");
1218                 goto drop_connection;
1219         }
1220
1221         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1222                                             chanctx->mode, false);
1223         if (res) {
1224                 sdata_info(sdata,
1225                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1226                            res);
1227                 goto drop_connection;
1228         }
1229         mutex_unlock(&local->chanctx_mtx);
1230
1231         sdata->vif.csa_active = true;
1232         sdata->csa_chandef = csa_ie.chandef;
1233         sdata->csa_block_tx = csa_ie.mode;
1234         ifmgd->csa_ignored_same_chan = false;
1235
1236         if (sdata->csa_block_tx)
1237                 ieee80211_stop_vif_queues(local, sdata,
1238                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1239         mutex_unlock(&local->mtx);
1240
1241         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1242                                           csa_ie.count);
1243
1244         if (local->ops->channel_switch) {
1245                 /* use driver's channel switch callback */
1246                 drv_channel_switch(local, sdata, &ch_switch);
1247                 return;
1248         }
1249
1250         /* channel switch handled in software */
1251         if (csa_ie.count <= 1)
1252                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1253         else
1254                 mod_timer(&ifmgd->chswitch_timer,
1255                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1256                                          cbss->beacon_interval));
1257         return;
1258  drop_connection:
1259         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1260         mutex_unlock(&local->chanctx_mtx);
1261         mutex_unlock(&local->mtx);
1262 }
1263
1264 static bool
1265 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1266                                  struct ieee80211_channel *channel,
1267                                  const u8 *country_ie, u8 country_ie_len,
1268                                  const u8 *pwr_constr_elem,
1269                                  int *chan_pwr, int *pwr_reduction)
1270 {
1271         struct ieee80211_country_ie_triplet *triplet;
1272         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1273         int i, chan_increment;
1274         bool have_chan_pwr = false;
1275
1276         /* Invalid IE */
1277         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1278                 return false;
1279
1280         triplet = (void *)(country_ie + 3);
1281         country_ie_len -= 3;
1282
1283         switch (channel->band) {
1284         default:
1285                 WARN_ON_ONCE(1);
1286                 /* fall through */
1287         case IEEE80211_BAND_2GHZ:
1288         case IEEE80211_BAND_60GHZ:
1289                 chan_increment = 1;
1290                 break;
1291         case IEEE80211_BAND_5GHZ:
1292                 chan_increment = 4;
1293                 break;
1294         }
1295
1296         /* find channel */
1297         while (country_ie_len >= 3) {
1298                 u8 first_channel = triplet->chans.first_channel;
1299
1300                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1301                         goto next;
1302
1303                 for (i = 0; i < triplet->chans.num_channels; i++) {
1304                         if (first_channel + i * chan_increment == chan) {
1305                                 have_chan_pwr = true;
1306                                 *chan_pwr = triplet->chans.max_power;
1307                                 break;
1308                         }
1309                 }
1310                 if (have_chan_pwr)
1311                         break;
1312
1313  next:
1314                 triplet++;
1315                 country_ie_len -= 3;
1316         }
1317
1318         if (have_chan_pwr && pwr_constr_elem)
1319                 *pwr_reduction = *pwr_constr_elem;
1320         else
1321                 *pwr_reduction = 0;
1322
1323         return have_chan_pwr;
1324 }
1325
1326 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1327                                       struct ieee80211_channel *channel,
1328                                       const u8 *cisco_dtpc_ie,
1329                                       int *pwr_level)
1330 {
1331         /* From practical testing, the first data byte of the DTPC element
1332          * seems to contain the requested dBm level, and the CLI on Cisco
1333          * APs clearly state the range is -127 to 127 dBm, which indicates
1334          * a signed byte, although it seemingly never actually goes negative.
1335          * The other byte seems to always be zero.
1336          */
1337         *pwr_level = (__s8)cisco_dtpc_ie[4];
1338 }
1339
1340 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1341                                        struct ieee80211_channel *channel,
1342                                        struct ieee80211_mgmt *mgmt,
1343                                        const u8 *country_ie, u8 country_ie_len,
1344                                        const u8 *pwr_constr_ie,
1345                                        const u8 *cisco_dtpc_ie)
1346 {
1347         bool has_80211h_pwr = false, has_cisco_pwr = false;
1348         int chan_pwr = 0, pwr_reduction_80211h = 0;
1349         int pwr_level_cisco, pwr_level_80211h;
1350         int new_ap_level;
1351         __le16 capab = mgmt->u.probe_resp.capab_info;
1352
1353         if (country_ie &&
1354             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1355              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1356                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1357                         sdata, channel, country_ie, country_ie_len,
1358                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1359                 pwr_level_80211h =
1360                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1361         }
1362
1363         if (cisco_dtpc_ie) {
1364                 ieee80211_find_cisco_dtpc(
1365                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1366                 has_cisco_pwr = true;
1367         }
1368
1369         if (!has_80211h_pwr && !has_cisco_pwr)
1370                 return 0;
1371
1372         /* If we have both 802.11h and Cisco DTPC, apply both limits
1373          * by picking the smallest of the two power levels advertised.
1374          */
1375         if (has_80211h_pwr &&
1376             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1377                 sdata_dbg(sdata,
1378                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1379                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1380                           sdata->u.mgd.bssid);
1381                 new_ap_level = pwr_level_80211h;
1382         } else {  /* has_cisco_pwr is always true here. */
1383                 sdata_dbg(sdata,
1384                           "Limiting TX power to %d dBm as advertised by %pM\n",
1385                           pwr_level_cisco, sdata->u.mgd.bssid);
1386                 new_ap_level = pwr_level_cisco;
1387         }
1388
1389         if (sdata->ap_power_level == new_ap_level)
1390                 return 0;
1391
1392         sdata->ap_power_level = new_ap_level;
1393         if (__ieee80211_recalc_txpower(sdata))
1394                 return BSS_CHANGED_TXPOWER;
1395         return 0;
1396 }
1397
1398 /* powersave */
1399 static void ieee80211_enable_ps(struct ieee80211_local *local,
1400                                 struct ieee80211_sub_if_data *sdata)
1401 {
1402         struct ieee80211_conf *conf = &local->hw.conf;
1403
1404         /*
1405          * If we are scanning right now then the parameters will
1406          * take effect when scan finishes.
1407          */
1408         if (local->scanning)
1409                 return;
1410
1411         if (conf->dynamic_ps_timeout > 0 &&
1412             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1413                 mod_timer(&local->dynamic_ps_timer, jiffies +
1414                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1415         } else {
1416                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1417                         ieee80211_send_nullfunc(local, sdata, 1);
1418
1419                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1420                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1421                         return;
1422
1423                 conf->flags |= IEEE80211_CONF_PS;
1424                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1425         }
1426 }
1427
1428 static void ieee80211_change_ps(struct ieee80211_local *local)
1429 {
1430         struct ieee80211_conf *conf = &local->hw.conf;
1431
1432         if (local->ps_sdata) {
1433                 ieee80211_enable_ps(local, local->ps_sdata);
1434         } else if (conf->flags & IEEE80211_CONF_PS) {
1435                 conf->flags &= ~IEEE80211_CONF_PS;
1436                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1437                 del_timer_sync(&local->dynamic_ps_timer);
1438                 cancel_work_sync(&local->dynamic_ps_enable_work);
1439         }
1440 }
1441
1442 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1443 {
1444         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1445         struct sta_info *sta = NULL;
1446         bool authorized = false;
1447
1448         if (!mgd->powersave)
1449                 return false;
1450
1451         if (mgd->broken_ap)
1452                 return false;
1453
1454         if (!mgd->associated)
1455                 return false;
1456
1457         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1458                 return false;
1459
1460         if (!mgd->have_beacon)
1461                 return false;
1462
1463         rcu_read_lock();
1464         sta = sta_info_get(sdata, mgd->bssid);
1465         if (sta)
1466                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1467         rcu_read_unlock();
1468
1469         return authorized;
1470 }
1471
1472 /* need to hold RTNL or interface lock */
1473 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1474 {
1475         struct ieee80211_sub_if_data *sdata, *found = NULL;
1476         int count = 0;
1477         int timeout;
1478
1479         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1480                 local->ps_sdata = NULL;
1481                 return;
1482         }
1483
1484         list_for_each_entry(sdata, &local->interfaces, list) {
1485                 if (!ieee80211_sdata_running(sdata))
1486                         continue;
1487                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1488                         /* If an AP vif is found, then disable PS
1489                          * by setting the count to zero thereby setting
1490                          * ps_sdata to NULL.
1491                          */
1492                         count = 0;
1493                         break;
1494                 }
1495                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1496                         continue;
1497                 found = sdata;
1498                 count++;
1499         }
1500
1501         if (count == 1 && ieee80211_powersave_allowed(found)) {
1502                 s32 beaconint_us;
1503
1504                 if (latency < 0)
1505                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1506
1507                 beaconint_us = ieee80211_tu_to_usec(
1508                                         found->vif.bss_conf.beacon_int);
1509
1510                 timeout = local->dynamic_ps_forced_timeout;
1511                 if (timeout < 0) {
1512                         /*
1513                          * Go to full PSM if the user configures a very low
1514                          * latency requirement.
1515                          * The 2000 second value is there for compatibility
1516                          * until the PM_QOS_NETWORK_LATENCY is configured
1517                          * with real values.
1518                          */
1519                         if (latency > (1900 * USEC_PER_MSEC) &&
1520                             latency != (2000 * USEC_PER_SEC))
1521                                 timeout = 0;
1522                         else
1523                                 timeout = 100;
1524                 }
1525                 local->hw.conf.dynamic_ps_timeout = timeout;
1526
1527                 if (beaconint_us > latency) {
1528                         local->ps_sdata = NULL;
1529                 } else {
1530                         int maxslp = 1;
1531                         u8 dtimper = found->u.mgd.dtim_period;
1532
1533                         /* If the TIM IE is invalid, pretend the value is 1 */
1534                         if (!dtimper)
1535                                 dtimper = 1;
1536                         else if (dtimper > 1)
1537                                 maxslp = min_t(int, dtimper,
1538                                                     latency / beaconint_us);
1539
1540                         local->hw.conf.max_sleep_period = maxslp;
1541                         local->hw.conf.ps_dtim_period = dtimper;
1542                         local->ps_sdata = found;
1543                 }
1544         } else {
1545                 local->ps_sdata = NULL;
1546         }
1547
1548         ieee80211_change_ps(local);
1549 }
1550
1551 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1552 {
1553         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1554
1555         if (sdata->vif.bss_conf.ps != ps_allowed) {
1556                 sdata->vif.bss_conf.ps = ps_allowed;
1557                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1558         }
1559 }
1560
1561 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1562 {
1563         struct ieee80211_local *local =
1564                 container_of(work, struct ieee80211_local,
1565                              dynamic_ps_disable_work);
1566
1567         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1568                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1569                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1570         }
1571
1572         ieee80211_wake_queues_by_reason(&local->hw,
1573                                         IEEE80211_MAX_QUEUE_MAP,
1574                                         IEEE80211_QUEUE_STOP_REASON_PS,
1575                                         false);
1576 }
1577
1578 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1579 {
1580         struct ieee80211_local *local =
1581                 container_of(work, struct ieee80211_local,
1582                              dynamic_ps_enable_work);
1583         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1584         struct ieee80211_if_managed *ifmgd;
1585         unsigned long flags;
1586         int q;
1587
1588         /* can only happen when PS was just disabled anyway */
1589         if (!sdata)
1590                 return;
1591
1592         ifmgd = &sdata->u.mgd;
1593
1594         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1595                 return;
1596
1597         if (local->hw.conf.dynamic_ps_timeout > 0) {
1598                 /* don't enter PS if TX frames are pending */
1599                 if (drv_tx_frames_pending(local)) {
1600                         mod_timer(&local->dynamic_ps_timer, jiffies +
1601                                   msecs_to_jiffies(
1602                                   local->hw.conf.dynamic_ps_timeout));
1603                         return;
1604                 }
1605
1606                 /*
1607                  * transmission can be stopped by others which leads to
1608                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1609                  * is not the actual idle state.
1610                  */
1611                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1612                 for (q = 0; q < local->hw.queues; q++) {
1613                         if (local->queue_stop_reasons[q]) {
1614                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1615                                                        flags);
1616                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1617                                           msecs_to_jiffies(
1618                                           local->hw.conf.dynamic_ps_timeout));
1619                                 return;
1620                         }
1621                 }
1622                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1623         }
1624
1625         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1626             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1627                 if (drv_tx_frames_pending(local)) {
1628                         mod_timer(&local->dynamic_ps_timer, jiffies +
1629                                   msecs_to_jiffies(
1630                                   local->hw.conf.dynamic_ps_timeout));
1631                 } else {
1632                         ieee80211_send_nullfunc(local, sdata, 1);
1633                         /* Flush to get the tx status of nullfunc frame */
1634                         ieee80211_flush_queues(local, sdata, false);
1635                 }
1636         }
1637
1638         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1639               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1640             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1641                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1642                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1643                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1644         }
1645 }
1646
1647 void ieee80211_dynamic_ps_timer(unsigned long data)
1648 {
1649         struct ieee80211_local *local = (void *) data;
1650
1651         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1652 }
1653
1654 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1655 {
1656         struct delayed_work *delayed_work =
1657                 container_of(work, struct delayed_work, work);
1658         struct ieee80211_sub_if_data *sdata =
1659                 container_of(delayed_work, struct ieee80211_sub_if_data,
1660                              dfs_cac_timer_work);
1661         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1662
1663         mutex_lock(&sdata->local->mtx);
1664         if (sdata->wdev.cac_started) {
1665                 ieee80211_vif_release_channel(sdata);
1666                 cfg80211_cac_event(sdata->dev, &chandef,
1667                                    NL80211_RADAR_CAC_FINISHED,
1668                                    GFP_KERNEL);
1669         }
1670         mutex_unlock(&sdata->local->mtx);
1671 }
1672
1673 static bool
1674 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1675 {
1676         struct ieee80211_local *local = sdata->local;
1677         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1678         bool ret = false;
1679         int ac;
1680
1681         if (local->hw.queues < IEEE80211_NUM_ACS)
1682                 return false;
1683
1684         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1685                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1686                 int non_acm_ac;
1687                 unsigned long now = jiffies;
1688
1689                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1690                     tx_tspec->admitted_time &&
1691                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1692                         tx_tspec->consumed_tx_time = 0;
1693                         tx_tspec->time_slice_start = now;
1694
1695                         if (tx_tspec->downgraded)
1696                                 tx_tspec->action =
1697                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1698                 }
1699
1700                 switch (tx_tspec->action) {
1701                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1702                         /* take the original parameters */
1703                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1704                                 sdata_err(sdata,
1705                                           "failed to set TX queue parameters for queue %d\n",
1706                                           ac);
1707                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1708                         tx_tspec->downgraded = false;
1709                         ret = true;
1710                         break;
1711                 case TX_TSPEC_ACTION_DOWNGRADE:
1712                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1713                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1714                                 ret = true;
1715                                 break;
1716                         }
1717                         /* downgrade next lower non-ACM AC */
1718                         for (non_acm_ac = ac + 1;
1719                              non_acm_ac < IEEE80211_NUM_ACS;
1720                              non_acm_ac++)
1721                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1722                                         break;
1723                         /* The loop will result in using BK even if it requires
1724                          * admission control, such configuration makes no sense
1725                          * and we have to transmit somehow - the AC selection
1726                          * does the same thing.
1727                          */
1728                         if (drv_conf_tx(local, sdata, ac,
1729                                         &sdata->tx_conf[non_acm_ac]))
1730                                 sdata_err(sdata,
1731                                           "failed to set TX queue parameters for queue %d\n",
1732                                           ac);
1733                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1734                         ret = true;
1735                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1736                                 tx_tspec->time_slice_start + HZ - now + 1);
1737                         break;
1738                 case TX_TSPEC_ACTION_NONE:
1739                         /* nothing now */
1740                         break;
1741                 }
1742         }
1743
1744         return ret;
1745 }
1746
1747 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1748 {
1749         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1750                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1751 }
1752
1753 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1754 {
1755         struct ieee80211_sub_if_data *sdata;
1756
1757         sdata = container_of(work, struct ieee80211_sub_if_data,
1758                              u.mgd.tx_tspec_wk.work);
1759         ieee80211_sta_handle_tspec_ac_params(sdata);
1760 }
1761
1762 /* MLME */
1763 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1764                                      struct ieee80211_sub_if_data *sdata,
1765                                      const u8 *wmm_param, size_t wmm_param_len)
1766 {
1767         struct ieee80211_tx_queue_params params;
1768         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1769         size_t left;
1770         int count;
1771         const u8 *pos;
1772         u8 uapsd_queues = 0;
1773
1774         if (!local->ops->conf_tx)
1775                 return false;
1776
1777         if (local->hw.queues < IEEE80211_NUM_ACS)
1778                 return false;
1779
1780         if (!wmm_param)
1781                 return false;
1782
1783         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1784                 return false;
1785
1786         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1787                 uapsd_queues = ifmgd->uapsd_queues;
1788
1789         count = wmm_param[6] & 0x0f;
1790         if (count == ifmgd->wmm_last_param_set)
1791                 return false;
1792         ifmgd->wmm_last_param_set = count;
1793
1794         pos = wmm_param + 8;
1795         left = wmm_param_len - 8;
1796
1797         memset(&params, 0, sizeof(params));
1798
1799         sdata->wmm_acm = 0;
1800         for (; left >= 4; left -= 4, pos += 4) {
1801                 int aci = (pos[0] >> 5) & 0x03;
1802                 int acm = (pos[0] >> 4) & 0x01;
1803                 bool uapsd = false;
1804                 int queue;
1805
1806                 switch (aci) {
1807                 case 1: /* AC_BK */
1808                         queue = 3;
1809                         if (acm)
1810                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1811                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1812                                 uapsd = true;
1813                         break;
1814                 case 2: /* AC_VI */
1815                         queue = 1;
1816                         if (acm)
1817                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1818                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1819                                 uapsd = true;
1820                         break;
1821                 case 3: /* AC_VO */
1822                         queue = 0;
1823                         if (acm)
1824                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1825                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1826                                 uapsd = true;
1827                         break;
1828                 case 0: /* AC_BE */
1829                 default:
1830                         queue = 2;
1831                         if (acm)
1832                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1833                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1834                                 uapsd = true;
1835                         break;
1836                 }
1837
1838                 params.aifs = pos[0] & 0x0f;
1839                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1840                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1841                 params.txop = get_unaligned_le16(pos + 2);
1842                 params.acm = acm;
1843                 params.uapsd = uapsd;
1844
1845                 mlme_dbg(sdata,
1846                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1847                          queue, aci, acm,
1848                          params.aifs, params.cw_min, params.cw_max,
1849                          params.txop, params.uapsd,
1850                          ifmgd->tx_tspec[queue].downgraded);
1851                 sdata->tx_conf[queue] = params;
1852                 if (!ifmgd->tx_tspec[queue].downgraded &&
1853                     drv_conf_tx(local, sdata, queue, &params))
1854                         sdata_err(sdata,
1855                                   "failed to set TX queue parameters for queue %d\n",
1856                                   queue);
1857         }
1858
1859         /* enable WMM or activate new settings */
1860         sdata->vif.bss_conf.qos = true;
1861         return true;
1862 }
1863
1864 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1865 {
1866         lockdep_assert_held(&sdata->local->mtx);
1867
1868         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1869         ieee80211_run_deferred_scan(sdata->local);
1870 }
1871
1872 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1873 {
1874         mutex_lock(&sdata->local->mtx);
1875         __ieee80211_stop_poll(sdata);
1876         mutex_unlock(&sdata->local->mtx);
1877 }
1878
1879 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1880                                            u16 capab, bool erp_valid, u8 erp)
1881 {
1882         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1883         u32 changed = 0;
1884         bool use_protection;
1885         bool use_short_preamble;
1886         bool use_short_slot;
1887
1888         if (erp_valid) {
1889                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1890                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1891         } else {
1892                 use_protection = false;
1893                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1894         }
1895
1896         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1897         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1898                 use_short_slot = true;
1899
1900         if (use_protection != bss_conf->use_cts_prot) {
1901                 bss_conf->use_cts_prot = use_protection;
1902                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1903         }
1904
1905         if (use_short_preamble != bss_conf->use_short_preamble) {
1906                 bss_conf->use_short_preamble = use_short_preamble;
1907                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1908         }
1909
1910         if (use_short_slot != bss_conf->use_short_slot) {
1911                 bss_conf->use_short_slot = use_short_slot;
1912                 changed |= BSS_CHANGED_ERP_SLOT;
1913         }
1914
1915         return changed;
1916 }
1917
1918 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1919                                      struct cfg80211_bss *cbss,
1920                                      u32 bss_info_changed)
1921 {
1922         struct ieee80211_bss *bss = (void *)cbss->priv;
1923         struct ieee80211_local *local = sdata->local;
1924         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1925
1926         bss_info_changed |= BSS_CHANGED_ASSOC;
1927         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1928                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1929
1930         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1931                 beacon_loss_count * bss_conf->beacon_int));
1932
1933         sdata->u.mgd.associated = cbss;
1934         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1935
1936         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1937
1938         if (sdata->vif.p2p) {
1939                 const struct cfg80211_bss_ies *ies;
1940
1941                 rcu_read_lock();
1942                 ies = rcu_dereference(cbss->ies);
1943                 if (ies) {
1944                         int ret;
1945
1946                         ret = cfg80211_get_p2p_attr(
1947                                         ies->data, ies->len,
1948                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1949                                         (u8 *) &bss_conf->p2p_noa_attr,
1950                                         sizeof(bss_conf->p2p_noa_attr));
1951                         if (ret >= 2) {
1952                                 sdata->u.mgd.p2p_noa_index =
1953                                         bss_conf->p2p_noa_attr.index;
1954                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1955                         }
1956                 }
1957                 rcu_read_unlock();
1958         }
1959
1960         /* just to be sure */
1961         ieee80211_stop_poll(sdata);
1962
1963         ieee80211_led_assoc(local, 1);
1964
1965         if (sdata->u.mgd.have_beacon) {
1966                 /*
1967                  * If the AP is buggy we may get here with no DTIM period
1968                  * known, so assume it's 1 which is the only safe assumption
1969                  * in that case, although if the TIM IE is broken powersave
1970                  * probably just won't work at all.
1971                  */
1972                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1973                 bss_conf->beacon_rate = bss->beacon_rate;
1974                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1975         } else {
1976                 bss_conf->beacon_rate = NULL;
1977                 bss_conf->dtim_period = 0;
1978         }
1979
1980         bss_conf->assoc = 1;
1981
1982         /* Tell the driver to monitor connection quality (if supported) */
1983         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1984             bss_conf->cqm_rssi_thold)
1985                 bss_info_changed |= BSS_CHANGED_CQM;
1986
1987         /* Enable ARP filtering */
1988         if (bss_conf->arp_addr_cnt)
1989                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1990
1991         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1992
1993         mutex_lock(&local->iflist_mtx);
1994         ieee80211_recalc_ps(local, -1);
1995         mutex_unlock(&local->iflist_mtx);
1996
1997         ieee80211_recalc_smps(sdata);
1998         ieee80211_recalc_ps_vif(sdata);
1999
2000         netif_carrier_on(sdata->dev);
2001 }
2002
2003 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2004                                    u16 stype, u16 reason, bool tx,
2005                                    u8 *frame_buf)
2006 {
2007         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2008         struct ieee80211_local *local = sdata->local;
2009         u32 changed = 0;
2010
2011         sdata_assert_lock(sdata);
2012
2013         if (WARN_ON_ONCE(tx && !frame_buf))
2014                 return;
2015
2016         if (WARN_ON(!ifmgd->associated))
2017                 return;
2018
2019         ieee80211_stop_poll(sdata);
2020
2021         ifmgd->associated = NULL;
2022         netif_carrier_off(sdata->dev);
2023
2024         /*
2025          * if we want to get out of ps before disassoc (why?) we have
2026          * to do it before sending disassoc, as otherwise the null-packet
2027          * won't be valid.
2028          */
2029         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2030                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2031                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2032         }
2033         local->ps_sdata = NULL;
2034
2035         /* disable per-vif ps */
2036         ieee80211_recalc_ps_vif(sdata);
2037
2038         /* make sure ongoing transmission finishes */
2039         synchronize_net();
2040
2041         /*
2042          * drop any frame before deauth/disassoc, this can be data or
2043          * management frame. Since we are disconnecting, we should not
2044          * insist sending these frames which can take time and delay
2045          * the disconnection and possible the roaming.
2046          */
2047         if (tx)
2048                 ieee80211_flush_queues(local, sdata, true);
2049
2050         /* deauthenticate/disassociate now */
2051         if (tx || frame_buf)
2052                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2053                                                reason, tx, frame_buf);
2054
2055         /* flush out frame - make sure the deauth was actually sent */
2056         if (tx)
2057                 ieee80211_flush_queues(local, sdata, false);
2058
2059         /* clear bssid only after building the needed mgmt frames */
2060         eth_zero_addr(ifmgd->bssid);
2061
2062         /* remove AP and TDLS peers */
2063         sta_info_flush(sdata);
2064
2065         /* finally reset all BSS / config parameters */
2066         changed |= ieee80211_reset_erp_info(sdata);
2067
2068         ieee80211_led_assoc(local, 0);
2069         changed |= BSS_CHANGED_ASSOC;
2070         sdata->vif.bss_conf.assoc = false;
2071
2072         ifmgd->p2p_noa_index = -1;
2073         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2074                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2075
2076         /* on the next assoc, re-program HT/VHT parameters */
2077         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2078         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2079         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2080         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2081
2082         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2083
2084         del_timer_sync(&local->dynamic_ps_timer);
2085         cancel_work_sync(&local->dynamic_ps_enable_work);
2086
2087         /* Disable ARP filtering */
2088         if (sdata->vif.bss_conf.arp_addr_cnt)
2089                 changed |= BSS_CHANGED_ARP_FILTER;
2090
2091         sdata->vif.bss_conf.qos = false;
2092         changed |= BSS_CHANGED_QOS;
2093
2094         /* The BSSID (not really interesting) and HT changed */
2095         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2096         ieee80211_bss_info_change_notify(sdata, changed);
2097
2098         /* disassociated - set to defaults now */
2099         ieee80211_set_wmm_default(sdata, false);
2100
2101         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2102         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2103         del_timer_sync(&sdata->u.mgd.timer);
2104         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2105
2106         sdata->vif.bss_conf.dtim_period = 0;
2107         sdata->vif.bss_conf.beacon_rate = NULL;
2108
2109         ifmgd->have_beacon = false;
2110
2111         ifmgd->flags = 0;
2112         mutex_lock(&local->mtx);
2113         ieee80211_vif_release_channel(sdata);
2114
2115         sdata->vif.csa_active = false;
2116         ifmgd->csa_waiting_bcn = false;
2117         ifmgd->csa_ignored_same_chan = false;
2118         if (sdata->csa_block_tx) {
2119                 ieee80211_wake_vif_queues(local, sdata,
2120                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2121                 sdata->csa_block_tx = false;
2122         }
2123         mutex_unlock(&local->mtx);
2124
2125         /* existing TX TSPEC sessions no longer exist */
2126         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2127         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2128
2129         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2130 }
2131
2132 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2133                              struct ieee80211_hdr *hdr)
2134 {
2135         /*
2136          * We can postpone the mgd.timer whenever receiving unicast frames
2137          * from AP because we know that the connection is working both ways
2138          * at that time. But multicast frames (and hence also beacons) must
2139          * be ignored here, because we need to trigger the timer during
2140          * data idle periods for sending the periodic probe request to the
2141          * AP we're connected to.
2142          */
2143         if (is_multicast_ether_addr(hdr->addr1))
2144                 return;
2145
2146         ieee80211_sta_reset_conn_monitor(sdata);
2147 }
2148
2149 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2150 {
2151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2152         struct ieee80211_local *local = sdata->local;
2153
2154         mutex_lock(&local->mtx);
2155         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2156                 goto out;
2157
2158         __ieee80211_stop_poll(sdata);
2159
2160         mutex_lock(&local->iflist_mtx);
2161         ieee80211_recalc_ps(local, -1);
2162         mutex_unlock(&local->iflist_mtx);
2163
2164         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2165                 goto out;
2166
2167         /*
2168          * We've received a probe response, but are not sure whether
2169          * we have or will be receiving any beacons or data, so let's
2170          * schedule the timers again, just in case.
2171          */
2172         ieee80211_sta_reset_beacon_monitor(sdata);
2173
2174         mod_timer(&ifmgd->conn_mon_timer,
2175                   round_jiffies_up(jiffies +
2176                                    IEEE80211_CONNECTION_IDLE_TIME));
2177 out:
2178         mutex_unlock(&local->mtx);
2179 }
2180
2181 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2182                                            struct ieee80211_hdr *hdr,
2183                                            u16 tx_time)
2184 {
2185         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2186         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2187         int ac = ieee80211_ac_from_tid(tid);
2188         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2189         unsigned long now = jiffies;
2190
2191         if (likely(!tx_tspec->admitted_time))
2192                 return;
2193
2194         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2195                 tx_tspec->consumed_tx_time = 0;
2196                 tx_tspec->time_slice_start = now;
2197
2198                 if (tx_tspec->downgraded) {
2199                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2200                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2201                 }
2202         }
2203
2204         if (tx_tspec->downgraded)
2205                 return;
2206
2207         tx_tspec->consumed_tx_time += tx_time;
2208
2209         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2210                 tx_tspec->downgraded = true;
2211                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2212                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2213         }
2214 }
2215
2216 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2217                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2218 {
2219         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2220
2221         if (!ieee80211_is_data(hdr->frame_control))
2222             return;
2223
2224         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2225             sdata->u.mgd.probe_send_count > 0) {
2226                 if (ack)
2227                         ieee80211_sta_reset_conn_monitor(sdata);
2228                 else
2229                         sdata->u.mgd.nullfunc_failed = true;
2230                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2231                 return;
2232         }
2233
2234         if (ack)
2235                 ieee80211_sta_reset_conn_monitor(sdata);
2236 }
2237
2238 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2239 {
2240         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2241         const u8 *ssid;
2242         u8 *dst = ifmgd->associated->bssid;
2243         u8 unicast_limit = max(1, max_probe_tries - 3);
2244
2245         /*
2246          * Try sending broadcast probe requests for the last three
2247          * probe requests after the first ones failed since some
2248          * buggy APs only support broadcast probe requests.
2249          */
2250         if (ifmgd->probe_send_count >= unicast_limit)
2251                 dst = NULL;
2252
2253         /*
2254          * When the hardware reports an accurate Tx ACK status, it's
2255          * better to send a nullfunc frame instead of a probe request,
2256          * as it will kick us off the AP quickly if we aren't associated
2257          * anymore. The timeout will be reset if the frame is ACKed by
2258          * the AP.
2259          */
2260         ifmgd->probe_send_count++;
2261
2262         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2263                 ifmgd->nullfunc_failed = false;
2264                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2265         } else {
2266                 int ssid_len;
2267
2268                 rcu_read_lock();
2269                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2270                 if (WARN_ON_ONCE(ssid == NULL))
2271                         ssid_len = 0;
2272                 else
2273                         ssid_len = ssid[1];
2274
2275                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2276                                          ssid + 2, ssid_len, NULL,
2277                                          0, (u32) -1, true, 0,
2278                                          ifmgd->associated->channel, false);
2279                 rcu_read_unlock();
2280         }
2281
2282         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2283         run_again(sdata, ifmgd->probe_timeout);
2284 }
2285
2286 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2287                                    bool beacon)
2288 {
2289         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2290         bool already = false;
2291
2292         if (!ieee80211_sdata_running(sdata))
2293                 return;
2294
2295         sdata_lock(sdata);
2296
2297         if (!ifmgd->associated)
2298                 goto out;
2299
2300         mutex_lock(&sdata->local->mtx);
2301
2302         if (sdata->local->tmp_channel || sdata->local->scanning) {
2303                 mutex_unlock(&sdata->local->mtx);
2304                 goto out;
2305         }
2306
2307         if (beacon) {
2308                 mlme_dbg_ratelimited(sdata,
2309                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2310                                      beacon_loss_count);
2311
2312                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2313         }
2314
2315         /*
2316          * The driver/our work has already reported this event or the
2317          * connection monitoring has kicked in and we have already sent
2318          * a probe request. Or maybe the AP died and the driver keeps
2319          * reporting until we disassociate...
2320          *
2321          * In either case we have to ignore the current call to this
2322          * function (except for setting the correct probe reason bit)
2323          * because otherwise we would reset the timer every time and
2324          * never check whether we received a probe response!
2325          */
2326         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2327                 already = true;
2328
2329         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2330
2331         mutex_unlock(&sdata->local->mtx);
2332
2333         if (already)
2334                 goto out;
2335
2336         mutex_lock(&sdata->local->iflist_mtx);
2337         ieee80211_recalc_ps(sdata->local, -1);
2338         mutex_unlock(&sdata->local->iflist_mtx);
2339
2340         ifmgd->probe_send_count = 0;
2341         ieee80211_mgd_probe_ap_send(sdata);
2342  out:
2343         sdata_unlock(sdata);
2344 }
2345
2346 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2347                                           struct ieee80211_vif *vif)
2348 {
2349         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2350         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2351         struct cfg80211_bss *cbss;
2352         struct sk_buff *skb;
2353         const u8 *ssid;
2354         int ssid_len;
2355
2356         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2357                 return NULL;
2358
2359         sdata_assert_lock(sdata);
2360
2361         if (ifmgd->associated)
2362                 cbss = ifmgd->associated;
2363         else if (ifmgd->auth_data)
2364                 cbss = ifmgd->auth_data->bss;
2365         else if (ifmgd->assoc_data)
2366                 cbss = ifmgd->assoc_data->bss;
2367         else
2368                 return NULL;
2369
2370         rcu_read_lock();
2371         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2372         if (WARN_ON_ONCE(ssid == NULL))
2373                 ssid_len = 0;
2374         else
2375                 ssid_len = ssid[1];
2376
2377         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2378                                         (u32) -1, cbss->channel,
2379                                         ssid + 2, ssid_len,
2380                                         NULL, 0, true);
2381         rcu_read_unlock();
2382
2383         return skb;
2384 }
2385 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2386
2387 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2388                                         const u8 *buf, size_t len, bool tx,
2389                                         u16 reason)
2390 {
2391         struct ieee80211_event event = {
2392                 .type = MLME_EVENT,
2393                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2394                 .u.mlme.reason = reason,
2395         };
2396
2397         if (tx)
2398                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2399         else
2400                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2401
2402         drv_event_callback(sdata->local, sdata, &event);
2403 }
2404
2405 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2406 {
2407         struct ieee80211_local *local = sdata->local;
2408         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2409         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2410
2411         sdata_lock(sdata);
2412         if (!ifmgd->associated) {
2413                 sdata_unlock(sdata);
2414                 return;
2415         }
2416
2417         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2418                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2419                                true, frame_buf);
2420         mutex_lock(&local->mtx);
2421         sdata->vif.csa_active = false;
2422         ifmgd->csa_waiting_bcn = false;
2423         if (sdata->csa_block_tx) {
2424                 ieee80211_wake_vif_queues(local, sdata,
2425                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2426                 sdata->csa_block_tx = false;
2427         }
2428         mutex_unlock(&local->mtx);
2429
2430         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2431                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2432
2433         sdata_unlock(sdata);
2434 }
2435
2436 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2437 {
2438         struct ieee80211_sub_if_data *sdata =
2439                 container_of(work, struct ieee80211_sub_if_data,
2440                              u.mgd.beacon_connection_loss_work);
2441         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2442         struct sta_info *sta;
2443
2444         if (ifmgd->associated) {
2445                 rcu_read_lock();
2446                 sta = sta_info_get(sdata, ifmgd->bssid);
2447                 if (sta)
2448                         sta->beacon_loss_count++;
2449                 rcu_read_unlock();
2450         }
2451
2452         if (ifmgd->connection_loss) {
2453                 sdata_info(sdata, "Connection to AP %pM lost\n",
2454                            ifmgd->bssid);
2455                 __ieee80211_disconnect(sdata);
2456         } else {
2457                 ieee80211_mgd_probe_ap(sdata, true);
2458         }
2459 }
2460
2461 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2462 {
2463         struct ieee80211_sub_if_data *sdata =
2464                 container_of(work, struct ieee80211_sub_if_data,
2465                              u.mgd.csa_connection_drop_work);
2466
2467         __ieee80211_disconnect(sdata);
2468 }
2469
2470 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2471 {
2472         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2473         struct ieee80211_hw *hw = &sdata->local->hw;
2474
2475         trace_api_beacon_loss(sdata);
2476
2477         sdata->u.mgd.connection_loss = false;
2478         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2479 }
2480 EXPORT_SYMBOL(ieee80211_beacon_loss);
2481
2482 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2483 {
2484         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2485         struct ieee80211_hw *hw = &sdata->local->hw;
2486
2487         trace_api_connection_loss(sdata);
2488
2489         sdata->u.mgd.connection_loss = true;
2490         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2491 }
2492 EXPORT_SYMBOL(ieee80211_connection_loss);
2493
2494
2495 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2496                                         bool assoc)
2497 {
2498         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2499
2500         sdata_assert_lock(sdata);
2501
2502         if (!assoc) {
2503                 /*
2504                  * we are not authenticated yet, the only timer that could be
2505                  * running is the timeout for the authentication response which
2506                  * which is not relevant anymore.
2507                  */
2508                 del_timer_sync(&sdata->u.mgd.timer);
2509                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2510
2511                 eth_zero_addr(sdata->u.mgd.bssid);
2512                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2513                 sdata->u.mgd.flags = 0;
2514                 mutex_lock(&sdata->local->mtx);
2515                 ieee80211_vif_release_channel(sdata);
2516                 mutex_unlock(&sdata->local->mtx);
2517         }
2518
2519         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2520         kfree(auth_data);
2521         sdata->u.mgd.auth_data = NULL;
2522 }
2523
2524 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2525                                          bool assoc)
2526 {
2527         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2528
2529         sdata_assert_lock(sdata);
2530
2531         if (!assoc) {
2532                 /*
2533                  * we are not associated yet, the only timer that could be
2534                  * running is the timeout for the association response which
2535                  * which is not relevant anymore.
2536                  */
2537                 del_timer_sync(&sdata->u.mgd.timer);
2538                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2539
2540                 eth_zero_addr(sdata->u.mgd.bssid);
2541                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2542                 sdata->u.mgd.flags = 0;
2543                 mutex_lock(&sdata->local->mtx);
2544                 ieee80211_vif_release_channel(sdata);
2545                 mutex_unlock(&sdata->local->mtx);
2546         }
2547
2548         kfree(assoc_data);
2549         sdata->u.mgd.assoc_data = NULL;
2550 }
2551
2552 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2553                                      struct ieee80211_mgmt *mgmt, size_t len)
2554 {
2555         struct ieee80211_local *local = sdata->local;
2556         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2557         u8 *pos;
2558         struct ieee802_11_elems elems;
2559         u32 tx_flags = 0;
2560
2561         pos = mgmt->u.auth.variable;
2562         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2563         if (!elems.challenge)
2564                 return;
2565         auth_data->expected_transaction = 4;
2566         drv_mgd_prepare_tx(sdata->local, sdata);
2567         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2568                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2569                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2570         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2571                             elems.challenge - 2, elems.challenge_len + 2,
2572                             auth_data->bss->bssid, auth_data->bss->bssid,
2573                             auth_data->key, auth_data->key_len,
2574                             auth_data->key_idx, tx_flags);
2575 }
2576
2577 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2578                                    struct ieee80211_mgmt *mgmt, size_t len)
2579 {
2580         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2581         u8 bssid[ETH_ALEN];
2582         u16 auth_alg, auth_transaction, status_code;
2583         struct sta_info *sta;
2584         struct ieee80211_event event = {
2585                 .type = MLME_EVENT,
2586                 .u.mlme.data = AUTH_EVENT,
2587         };
2588
2589         sdata_assert_lock(sdata);
2590
2591         if (len < 24 + 6)
2592                 return;
2593
2594         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2595                 return;
2596
2597         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2598
2599         if (!ether_addr_equal(bssid, mgmt->bssid))
2600                 return;
2601
2602         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2603         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2604         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2605
2606         if (auth_alg != ifmgd->auth_data->algorithm ||
2607             auth_transaction != ifmgd->auth_data->expected_transaction) {
2608                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2609                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2610                            auth_transaction,
2611                            ifmgd->auth_data->expected_transaction);
2612                 return;
2613         }
2614
2615         if (status_code != WLAN_STATUS_SUCCESS) {
2616                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2617                            mgmt->sa, status_code);
2618                 ieee80211_destroy_auth_data(sdata, false);
2619                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2620                 event.u.mlme.status = MLME_DENIED;
2621                 event.u.mlme.reason = status_code;
2622                 drv_event_callback(sdata->local, sdata, &event);
2623                 return;
2624         }
2625
2626         switch (ifmgd->auth_data->algorithm) {
2627         case WLAN_AUTH_OPEN:
2628         case WLAN_AUTH_LEAP:
2629         case WLAN_AUTH_FT:
2630         case WLAN_AUTH_SAE:
2631                 break;
2632         case WLAN_AUTH_SHARED_KEY:
2633                 if (ifmgd->auth_data->expected_transaction != 4) {
2634                         ieee80211_auth_challenge(sdata, mgmt, len);
2635                         /* need another frame */
2636                         return;
2637                 }
2638                 break;
2639         default:
2640                 WARN_ONCE(1, "invalid auth alg %d",
2641                           ifmgd->auth_data->algorithm);
2642                 return;
2643         }
2644
2645         event.u.mlme.status = MLME_SUCCESS;
2646         drv_event_callback(sdata->local, sdata, &event);
2647         sdata_info(sdata, "authenticated\n");
2648         ifmgd->auth_data->done = true;
2649         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2650         ifmgd->auth_data->timeout_started = true;
2651         run_again(sdata, ifmgd->auth_data->timeout);
2652
2653         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2654             ifmgd->auth_data->expected_transaction != 2) {
2655                 /*
2656                  * Report auth frame to user space for processing since another
2657                  * round of Authentication frames is still needed.
2658                  */
2659                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2660                 return;
2661         }
2662
2663         /* move station state to auth */
2664         mutex_lock(&sdata->local->sta_mtx);
2665         sta = sta_info_get(sdata, bssid);
2666         if (!sta) {
2667                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2668                 goto out_err;
2669         }
2670         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2671                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2672                 goto out_err;
2673         }
2674         mutex_unlock(&sdata->local->sta_mtx);
2675
2676         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2677         return;
2678  out_err:
2679         mutex_unlock(&sdata->local->sta_mtx);
2680         /* ignore frame -- wait for timeout */
2681 }
2682
2683 #define case_WLAN(type) \
2684         case WLAN_REASON_##type: return #type
2685
2686 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2687 {
2688         switch (reason_code) {
2689         case_WLAN(UNSPECIFIED);
2690         case_WLAN(PREV_AUTH_NOT_VALID);
2691         case_WLAN(DEAUTH_LEAVING);
2692         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2693         case_WLAN(DISASSOC_AP_BUSY);
2694         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2695         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2696         case_WLAN(DISASSOC_STA_HAS_LEFT);
2697         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2698         case_WLAN(DISASSOC_BAD_POWER);
2699         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2700         case_WLAN(INVALID_IE);
2701         case_WLAN(MIC_FAILURE);
2702         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2703         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2704         case_WLAN(IE_DIFFERENT);
2705         case_WLAN(INVALID_GROUP_CIPHER);
2706         case_WLAN(INVALID_PAIRWISE_CIPHER);
2707         case_WLAN(INVALID_AKMP);
2708         case_WLAN(UNSUPP_RSN_VERSION);
2709         case_WLAN(INVALID_RSN_IE_CAP);
2710         case_WLAN(IEEE8021X_FAILED);
2711         case_WLAN(CIPHER_SUITE_REJECTED);
2712         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2713         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2714         case_WLAN(DISASSOC_LOW_ACK);
2715         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2716         case_WLAN(QSTA_LEAVE_QBSS);
2717         case_WLAN(QSTA_NOT_USE);
2718         case_WLAN(QSTA_REQUIRE_SETUP);
2719         case_WLAN(QSTA_TIMEOUT);
2720         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2721         case_WLAN(MESH_PEER_CANCELED);
2722         case_WLAN(MESH_MAX_PEERS);
2723         case_WLAN(MESH_CONFIG);
2724         case_WLAN(MESH_CLOSE);
2725         case_WLAN(MESH_MAX_RETRIES);
2726         case_WLAN(MESH_CONFIRM_TIMEOUT);
2727         case_WLAN(MESH_INVALID_GTK);
2728         case_WLAN(MESH_INCONSISTENT_PARAM);
2729         case_WLAN(MESH_INVALID_SECURITY);
2730         case_WLAN(MESH_PATH_ERROR);
2731         case_WLAN(MESH_PATH_NOFORWARD);
2732         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2733         case_WLAN(MAC_EXISTS_IN_MBSS);
2734         case_WLAN(MESH_CHAN_REGULATORY);
2735         case_WLAN(MESH_CHAN);
2736         default: return "<unknown>";
2737         }
2738 }
2739
2740 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2741                                      struct ieee80211_mgmt *mgmt, size_t len)
2742 {
2743         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2744         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2745
2746         sdata_assert_lock(sdata);
2747
2748         if (len < 24 + 2)
2749                 return;
2750
2751         if (ifmgd->associated &&
2752             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2753                 const u8 *bssid = ifmgd->associated->bssid;
2754
2755                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2756                            bssid, reason_code,
2757                            ieee80211_get_reason_code_string(reason_code));
2758
2759                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2760
2761                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2762                                             reason_code);
2763                 return;
2764         }
2765
2766         if (ifmgd->assoc_data &&
2767             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2768                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2769
2770                 sdata_info(sdata,
2771                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2772                            bssid, reason_code,
2773                            ieee80211_get_reason_code_string(reason_code));
2774
2775                 ieee80211_destroy_assoc_data(sdata, false);
2776
2777                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2778                 return;
2779         }
2780 }
2781
2782
2783 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2784                                        struct ieee80211_mgmt *mgmt, size_t len)
2785 {
2786         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2787         u16 reason_code;
2788
2789         sdata_assert_lock(sdata);
2790
2791         if (len < 24 + 2)
2792                 return;
2793
2794         if (!ifmgd->associated ||
2795             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2796                 return;
2797
2798         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2799
2800         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2801                    mgmt->sa, reason_code);
2802
2803         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2804
2805         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2806 }
2807
2808 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2809                                 u8 *supp_rates, unsigned int supp_rates_len,
2810                                 u32 *rates, u32 *basic_rates,
2811                                 bool *have_higher_than_11mbit,
2812                                 int *min_rate, int *min_rate_index,
2813                                 int shift, u32 rate_flags)
2814 {
2815         int i, j;
2816
2817         for (i = 0; i < supp_rates_len; i++) {
2818                 int rate = supp_rates[i] & 0x7f;
2819                 bool is_basic = !!(supp_rates[i] & 0x80);
2820
2821                 if ((rate * 5 * (1 << shift)) > 110)
2822                         *have_higher_than_11mbit = true;
2823
2824                 /*
2825                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2826                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2827                  *
2828                  * Note: Even through the membership selector and the basic
2829                  *       rate flag share the same bit, they are not exactly
2830                  *       the same.
2831                  */
2832                 if (!!(supp_rates[i] & 0x80) &&
2833                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2834                         continue;
2835
2836                 for (j = 0; j < sband->n_bitrates; j++) {
2837                         struct ieee80211_rate *br;
2838                         int brate;
2839
2840                         br = &sband->bitrates[j];
2841                         if ((rate_flags & br->flags) != rate_flags)
2842                                 continue;
2843
2844                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2845                         if (brate == rate) {
2846                                 *rates |= BIT(j);
2847                                 if (is_basic)
2848                                         *basic_rates |= BIT(j);
2849                                 if ((rate * 5) < *min_rate) {
2850                                         *min_rate = rate * 5;
2851                                         *min_rate_index = j;
2852                                 }
2853                                 break;
2854                         }
2855                 }
2856         }
2857 }
2858
2859 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2860                                     struct cfg80211_bss *cbss,
2861                                     struct ieee80211_mgmt *mgmt, size_t len)
2862 {
2863         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2864         struct ieee80211_local *local = sdata->local;
2865         struct ieee80211_supported_band *sband;
2866         struct sta_info *sta;
2867         u8 *pos;
2868         u16 capab_info, aid;
2869         struct ieee802_11_elems elems;
2870         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2871         const struct cfg80211_bss_ies *bss_ies = NULL;
2872         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2873         u32 changed = 0;
2874         int err;
2875         bool ret;
2876
2877         /* AssocResp and ReassocResp have identical structure */
2878
2879         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2880         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2881
2882         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2883                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2884                            aid);
2885         aid &= ~(BIT(15) | BIT(14));
2886
2887         ifmgd->broken_ap = false;
2888
2889         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2890                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2891                            aid);
2892                 aid = 0;
2893                 ifmgd->broken_ap = true;
2894         }
2895
2896         pos = mgmt->u.assoc_resp.variable;
2897         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2898
2899         if (!elems.supp_rates) {
2900                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2901                 return false;
2902         }
2903
2904         ifmgd->aid = aid;
2905         ifmgd->tdls_chan_switch_prohibited =
2906                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2907                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2908
2909         /*
2910          * Some APs are erroneously not including some information in their
2911          * (re)association response frames. Try to recover by using the data
2912          * from the beacon or probe response. This seems to afflict mobile
2913          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2914          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2915          */
2916         if ((assoc_data->wmm && !elems.wmm_param) ||
2917             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2918              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2919             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2920              (!elems.vht_cap_elem || !elems.vht_operation))) {
2921                 const struct cfg80211_bss_ies *ies;
2922                 struct ieee802_11_elems bss_elems;
2923
2924                 rcu_read_lock();
2925                 ies = rcu_dereference(cbss->ies);
2926                 if (ies)
2927                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2928                                           GFP_ATOMIC);
2929                 rcu_read_unlock();
2930                 if (!bss_ies)
2931                         return false;
2932
2933                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2934                                        false, &bss_elems);
2935                 if (assoc_data->wmm &&
2936                     !elems.wmm_param && bss_elems.wmm_param) {
2937                         elems.wmm_param = bss_elems.wmm_param;
2938                         sdata_info(sdata,
2939                                    "AP bug: WMM param missing from AssocResp\n");
2940                 }
2941
2942                 /*
2943                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2944                  * have to include the IEs in the (re)association response.
2945                  */
2946                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2947                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2948                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2949                         sdata_info(sdata,
2950                                    "AP bug: HT capability missing from AssocResp\n");
2951                 }
2952                 if (!elems.ht_operation && bss_elems.ht_operation &&
2953                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2954                         elems.ht_operation = bss_elems.ht_operation;
2955                         sdata_info(sdata,
2956                                    "AP bug: HT operation missing from AssocResp\n");
2957                 }
2958                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2959                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2960                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2961                         sdata_info(sdata,
2962                                    "AP bug: VHT capa missing from AssocResp\n");
2963                 }
2964                 if (!elems.vht_operation && bss_elems.vht_operation &&
2965                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2966                         elems.vht_operation = bss_elems.vht_operation;
2967                         sdata_info(sdata,
2968                                    "AP bug: VHT operation missing from AssocResp\n");
2969                 }
2970         }
2971
2972         /*
2973          * We previously checked these in the beacon/probe response, so
2974          * they should be present here. This is just a safety net.
2975          */
2976         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2977             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2978                 sdata_info(sdata,
2979                            "HT AP is missing WMM params or HT capability/operation\n");
2980                 ret = false;
2981                 goto out;
2982         }
2983
2984         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2985             (!elems.vht_cap_elem || !elems.vht_operation)) {
2986                 sdata_info(sdata,
2987                            "VHT AP is missing VHT capability/operation\n");
2988                 ret = false;
2989                 goto out;
2990         }
2991
2992         mutex_lock(&sdata->local->sta_mtx);
2993         /*
2994          * station info was already allocated and inserted before
2995          * the association and should be available to us
2996          */
2997         sta = sta_info_get(sdata, cbss->bssid);
2998         if (WARN_ON(!sta)) {
2999                 mutex_unlock(&sdata->local->sta_mtx);
3000                 ret = false;
3001                 goto out;
3002         }
3003
3004         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
3005
3006         /* Set up internal HT/VHT capabilities */
3007         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3008                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3009                                                   elems.ht_cap_elem, sta);
3010
3011         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3012                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3013                                                     elems.vht_cap_elem, sta);
3014
3015         /*
3016          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3017          * in their association response, so ignore that data for our own
3018          * configuration. If it changed since the last beacon, we'll get the
3019          * next beacon and update then.
3020          */
3021
3022         /*
3023          * If an operating mode notification IE is present, override the
3024          * NSS calculation (that would be done in rate_control_rate_init())
3025          * and use the # of streams from that element.
3026          */
3027         if (elems.opmode_notif &&
3028             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3029                 u8 nss;
3030
3031                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3032                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3033                 nss += 1;
3034                 sta->sta.rx_nss = nss;
3035         }
3036
3037         rate_control_rate_init(sta);
3038
3039         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3040                 set_sta_flag(sta, WLAN_STA_MFP);
3041                 sta->sta.mfp = true;
3042         } else {
3043                 sta->sta.mfp = false;
3044         }
3045
3046         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3047
3048         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3049         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3050                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3051         if (err) {
3052                 sdata_info(sdata,
3053                            "failed to move station %pM to desired state\n",
3054                            sta->sta.addr);
3055                 WARN_ON(__sta_info_destroy(sta));
3056                 mutex_unlock(&sdata->local->sta_mtx);
3057                 ret = false;
3058                 goto out;
3059         }
3060
3061         mutex_unlock(&sdata->local->sta_mtx);
3062
3063         /*
3064          * Always handle WMM once after association regardless
3065          * of the first value the AP uses. Setting -1 here has
3066          * that effect because the AP values is an unsigned
3067          * 4-bit value.
3068          */
3069         ifmgd->wmm_last_param_set = -1;
3070
3071         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
3072                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3073                                          elems.wmm_param_len);
3074         else
3075                 ieee80211_set_wmm_default(sdata, false);
3076         changed |= BSS_CHANGED_QOS;
3077
3078         /* set AID and assoc capability,
3079          * ieee80211_set_associated() will tell the driver */
3080         bss_conf->aid = aid;
3081         bss_conf->assoc_capability = capab_info;
3082         ieee80211_set_associated(sdata, cbss, changed);
3083
3084         /*
3085          * If we're using 4-addr mode, let the AP know that we're
3086          * doing so, so that it can create the STA VLAN on its side
3087          */
3088         if (ifmgd->use_4addr)
3089                 ieee80211_send_4addr_nullfunc(local, sdata);
3090
3091         /*
3092          * Start timer to probe the connection to the AP now.
3093          * Also start the timer that will detect beacon loss.
3094          */
3095         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3096         ieee80211_sta_reset_beacon_monitor(sdata);
3097
3098         ret = true;
3099  out:
3100         kfree(bss_ies);
3101         return ret;
3102 }
3103
3104 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3105                                          struct ieee80211_mgmt *mgmt,
3106                                          size_t len)
3107 {
3108         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3109         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3110         u16 capab_info, status_code, aid;
3111         struct ieee802_11_elems elems;
3112         int ac, uapsd_queues = -1;
3113         u8 *pos;
3114         bool reassoc;
3115         struct cfg80211_bss *bss;
3116         struct ieee80211_event event = {
3117                 .type = MLME_EVENT,
3118                 .u.mlme.data = ASSOC_EVENT,
3119         };
3120
3121         sdata_assert_lock(sdata);
3122
3123         if (!assoc_data)
3124                 return;
3125         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3126                 return;
3127
3128         /*
3129          * AssocResp and ReassocResp have identical structure, so process both
3130          * of them in this function.
3131          */
3132
3133         if (len < 24 + 6)
3134                 return;
3135
3136         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3137         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3138         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3139         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3140
3141         sdata_info(sdata,
3142                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3143                    reassoc ? "Rea" : "A", mgmt->sa,
3144                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3145
3146         pos = mgmt->u.assoc_resp.variable;
3147         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3148
3149         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3150             elems.timeout_int &&
3151             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3152                 u32 tu, ms;
3153                 tu = le32_to_cpu(elems.timeout_int->value);
3154                 ms = tu * 1024 / 1000;
3155                 sdata_info(sdata,
3156                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3157                            mgmt->sa, tu, ms);
3158                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3159                 assoc_data->timeout_started = true;
3160                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3161                         run_again(sdata, assoc_data->timeout);
3162                 return;
3163         }
3164
3165         bss = assoc_data->bss;
3166
3167         if (status_code != WLAN_STATUS_SUCCESS) {
3168                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3169                            mgmt->sa, status_code);
3170                 ieee80211_destroy_assoc_data(sdata, false);
3171                 event.u.mlme.status = MLME_DENIED;
3172                 event.u.mlme.reason = status_code;
3173                 drv_event_callback(sdata->local, sdata, &event);
3174         } else {
3175                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3176                         /* oops -- internal error -- send timeout for now */
3177                         ieee80211_destroy_assoc_data(sdata, false);
3178                         cfg80211_assoc_timeout(sdata->dev, bss);
3179                         return;
3180                 }
3181                 event.u.mlme.status = MLME_SUCCESS;
3182                 drv_event_callback(sdata->local, sdata, &event);
3183                 sdata_info(sdata, "associated\n");
3184
3185                 /*
3186                  * destroy assoc_data afterwards, as otherwise an idle
3187                  * recalc after assoc_data is NULL but before associated
3188                  * is set can cause the interface to go idle
3189                  */
3190                 ieee80211_destroy_assoc_data(sdata, true);
3191
3192                 /* get uapsd queues configuration */
3193                 uapsd_queues = 0;
3194                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3195                         if (sdata->tx_conf[ac].uapsd)
3196                                 uapsd_queues |= BIT(ac);
3197         }
3198
3199         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3200 }
3201
3202 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3203                                   struct ieee80211_mgmt *mgmt, size_t len,
3204                                   struct ieee80211_rx_status *rx_status,
3205                                   struct ieee802_11_elems *elems)
3206 {
3207         struct ieee80211_local *local = sdata->local;
3208         struct ieee80211_bss *bss;
3209         struct ieee80211_channel *channel;
3210
3211         sdata_assert_lock(sdata);
3212
3213         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3214         if (!channel)
3215                 return;
3216
3217         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3218                                         channel);
3219         if (bss) {
3220                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3221                 ieee80211_rx_bss_put(local, bss);
3222         }
3223 }
3224
3225
3226 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3227                                          struct sk_buff *skb)
3228 {
3229         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3230         struct ieee80211_if_managed *ifmgd;
3231         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3232         size_t baselen, len = skb->len;
3233         struct ieee802_11_elems elems;
3234
3235         ifmgd = &sdata->u.mgd;
3236
3237         sdata_assert_lock(sdata);
3238
3239         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3240                 return; /* ignore ProbeResp to foreign address */
3241
3242         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3243         if (baselen > len)
3244                 return;
3245
3246         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3247                                false, &elems);
3248
3249         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3250
3251         if (ifmgd->associated &&
3252             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3253                 ieee80211_reset_ap_probe(sdata);
3254
3255         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3256             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3257                 /* got probe response, continue with auth */
3258                 sdata_info(sdata, "direct probe responded\n");
3259                 ifmgd->auth_data->tries = 0;
3260                 ifmgd->auth_data->timeout = jiffies;
3261                 ifmgd->auth_data->timeout_started = true;
3262                 run_again(sdata, ifmgd->auth_data->timeout);
3263         }
3264 }
3265
3266 /*
3267  * This is the canonical list of information elements we care about,
3268  * the filter code also gives us all changes to the Microsoft OUI
3269  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3270  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3271  * changes to requested client power.
3272  *
3273  * We implement beacon filtering in software since that means we can
3274  * avoid processing the frame here and in cfg80211, and userspace
3275  * will not be able to tell whether the hardware supports it or not.
3276  *
3277  * XXX: This list needs to be dynamic -- userspace needs to be able to
3278  *      add items it requires. It also needs to be able to tell us to
3279  *      look out for other vendor IEs.
3280  */
3281 static const u64 care_about_ies =
3282         (1ULL << WLAN_EID_COUNTRY) |
3283         (1ULL << WLAN_EID_ERP_INFO) |
3284         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3285         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3286         (1ULL << WLAN_EID_HT_CAPABILITY) |
3287         (1ULL << WLAN_EID_HT_OPERATION) |
3288         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3289
3290 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3291                                      struct ieee80211_mgmt *mgmt, size_t len,
3292                                      struct ieee80211_rx_status *rx_status)
3293 {
3294         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3295         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3296         size_t baselen;
3297         struct ieee802_11_elems elems;
3298         struct ieee80211_local *local = sdata->local;
3299         struct ieee80211_chanctx_conf *chanctx_conf;
3300         struct ieee80211_channel *chan;
3301         struct sta_info *sta;
3302         u32 changed = 0;
3303         bool erp_valid;
3304         u8 erp_value = 0;
3305         u32 ncrc;
3306         u8 *bssid;
3307         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3308
3309         sdata_assert_lock(sdata);
3310
3311         /* Process beacon from the current BSS */
3312         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3313         if (baselen > len)
3314                 return;
3315
3316         rcu_read_lock();
3317         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3318         if (!chanctx_conf) {
3319                 rcu_read_unlock();
3320                 return;
3321         }
3322
3323         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3324                 rcu_read_unlock();
3325                 return;
3326         }
3327         chan = chanctx_conf->def.chan;
3328         rcu_read_unlock();
3329
3330         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3331             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3332                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3333                                        len - baselen, false, &elems);
3334
3335                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3336                 if (elems.tim && !elems.parse_error) {
3337                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3338                         ifmgd->dtim_period = tim_ie->dtim_period;
3339                 }
3340                 ifmgd->have_beacon = true;
3341                 ifmgd->assoc_data->need_beacon = false;
3342                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3343                         sdata->vif.bss_conf.sync_tsf =
3344                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3345                         sdata->vif.bss_conf.sync_device_ts =
3346                                 rx_status->device_timestamp;
3347                         if (elems.tim)
3348                                 sdata->vif.bss_conf.sync_dtim_count =
3349                                         elems.tim->dtim_count;
3350                         else
3351                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3352                 }
3353                 /* continue assoc process */
3354                 ifmgd->assoc_data->timeout = jiffies;
3355                 ifmgd->assoc_data->timeout_started = true;
3356                 run_again(sdata, ifmgd->assoc_data->timeout);
3357                 return;
3358         }
3359
3360         if (!ifmgd->associated ||
3361             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3362                 return;
3363         bssid = ifmgd->associated->bssid;
3364
3365         /* Track average RSSI from the Beacon frames of the current AP */
3366         ifmgd->last_beacon_signal = rx_status->signal;
3367         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3368                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3369                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3370                 ifmgd->last_cqm_event_signal = 0;
3371                 ifmgd->count_beacon_signal = 1;
3372                 ifmgd->last_ave_beacon_signal = 0;
3373         } else {
3374                 ifmgd->ave_beacon_signal =
3375                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3376                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3377                          ifmgd->ave_beacon_signal) / 16;
3378                 ifmgd->count_beacon_signal++;
3379         }
3380
3381         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3382             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3383                 int sig = ifmgd->ave_beacon_signal;
3384                 int last_sig = ifmgd->last_ave_beacon_signal;
3385                 struct ieee80211_event event = {
3386                         .type = RSSI_EVENT,
3387                 };
3388
3389                 /*
3390                  * if signal crosses either of the boundaries, invoke callback
3391                  * with appropriate parameters
3392                  */
3393                 if (sig > ifmgd->rssi_max_thold &&
3394                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3395                         ifmgd->last_ave_beacon_signal = sig;
3396                         event.u.rssi.data = RSSI_EVENT_HIGH;
3397                         drv_event_callback(local, sdata, &event);
3398                 } else if (sig < ifmgd->rssi_min_thold &&
3399                            (last_sig >= ifmgd->rssi_max_thold ||
3400                            last_sig == 0)) {
3401                         ifmgd->last_ave_beacon_signal = sig;
3402                         event.u.rssi.data = RSSI_EVENT_LOW;
3403                         drv_event_callback(local, sdata, &event);
3404                 }
3405         }
3406
3407         if (bss_conf->cqm_rssi_thold &&
3408             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3409             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3410                 int sig = ifmgd->ave_beacon_signal / 16;
3411                 int last_event = ifmgd->last_cqm_event_signal;
3412                 int thold = bss_conf->cqm_rssi_thold;
3413                 int hyst = bss_conf->cqm_rssi_hyst;
3414                 if (sig < thold &&
3415                     (last_event == 0 || sig < last_event - hyst)) {
3416                         ifmgd->last_cqm_event_signal = sig;
3417                         ieee80211_cqm_rssi_notify(
3418                                 &sdata->vif,
3419                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3420                                 GFP_KERNEL);
3421                 } else if (sig > thold &&
3422                            (last_event == 0 || sig > last_event + hyst)) {
3423                         ifmgd->last_cqm_event_signal = sig;
3424                         ieee80211_cqm_rssi_notify(
3425                                 &sdata->vif,
3426                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3427                                 GFP_KERNEL);
3428                 }
3429         }
3430
3431         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3432                 mlme_dbg_ratelimited(sdata,
3433                                      "cancelling AP probe due to a received beacon\n");
3434                 ieee80211_reset_ap_probe(sdata);
3435         }
3436
3437         /*
3438          * Push the beacon loss detection into the future since
3439          * we are processing a beacon from the AP just now.
3440          */
3441         ieee80211_sta_reset_beacon_monitor(sdata);
3442
3443         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3444         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3445                                           len - baselen, false, &elems,
3446                                           care_about_ies, ncrc);
3447
3448         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3449                 bool directed_tim = ieee80211_check_tim(elems.tim,
3450                                                         elems.tim_len,
3451                                                         ifmgd->aid);
3452                 if (directed_tim) {
3453                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3454                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3455                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3456                                         ieee80211_hw_config(local,
3457                                                             IEEE80211_CONF_CHANGE_PS);
3458                                 }
3459                                 ieee80211_send_nullfunc(local, sdata, 0);
3460                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3461                                 local->pspolling = true;
3462
3463                                 /*
3464                                  * Here is assumed that the driver will be
3465                                  * able to send ps-poll frame and receive a
3466                                  * response even though power save mode is
3467                                  * enabled, but some drivers might require
3468                                  * to disable power save here. This needs
3469                                  * to be investigated.
3470                                  */
3471                                 ieee80211_send_pspoll(local, sdata);
3472                         }
3473                 }
3474         }
3475
3476         if (sdata->vif.p2p) {
3477                 struct ieee80211_p2p_noa_attr noa = {};
3478                 int ret;
3479
3480                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3481                                             len - baselen,
3482                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3483                                             (u8 *) &noa, sizeof(noa));
3484                 if (ret >= 2) {
3485                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3486                                 /* valid noa_attr and index changed */
3487                                 sdata->u.mgd.p2p_noa_index = noa.index;
3488                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3489                                 changed |= BSS_CHANGED_P2P_PS;
3490                                 /*
3491                                  * make sure we update all information, the CRC
3492                                  * mechanism doesn't look at P2P attributes.
3493                                  */
3494                                 ifmgd->beacon_crc_valid = false;
3495                         }
3496                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3497                         /* noa_attr not found and we had valid noa_attr before */
3498                         sdata->u.mgd.p2p_noa_index = -1;
3499                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3500                         changed |= BSS_CHANGED_P2P_PS;
3501                         ifmgd->beacon_crc_valid = false;
3502                 }
3503         }
3504
3505         if (ifmgd->csa_waiting_bcn)
3506                 ieee80211_chswitch_post_beacon(sdata);
3507
3508         /*
3509          * Update beacon timing and dtim count on every beacon appearance. This
3510          * will allow the driver to use the most updated values. Do it before
3511          * comparing this one with last received beacon.
3512          * IMPORTANT: These parameters would possibly be out of sync by the time
3513          * the driver will use them. The synchronized view is currently
3514          * guaranteed only in certain callbacks.
3515          */
3516         if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3517                 sdata->vif.bss_conf.sync_tsf =
3518                         le64_to_cpu(mgmt->u.beacon.timestamp);
3519                 sdata->vif.bss_conf.sync_device_ts =
3520                         rx_status->device_timestamp;
3521                 if (elems.tim)
3522                         sdata->vif.bss_conf.sync_dtim_count =
3523                                 elems.tim->dtim_count;
3524                 else
3525                         sdata->vif.bss_conf.sync_dtim_count = 0;
3526         }
3527
3528         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3529                 return;
3530         ifmgd->beacon_crc = ncrc;
3531         ifmgd->beacon_crc_valid = true;
3532
3533         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3534
3535         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3536                                          rx_status->device_timestamp,
3537                                          &elems, true);
3538
3539         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3540             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3541                                      elems.wmm_param_len))
3542                 changed |= BSS_CHANGED_QOS;
3543
3544         /*
3545          * If we haven't had a beacon before, tell the driver about the
3546          * DTIM period (and beacon timing if desired) now.
3547          */
3548         if (!ifmgd->have_beacon) {
3549                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3550                 if (elems.tim)
3551                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3552                 else
3553                         bss_conf->dtim_period = 1;
3554
3555                 changed |= BSS_CHANGED_BEACON_INFO;
3556                 ifmgd->have_beacon = true;
3557
3558                 mutex_lock(&local->iflist_mtx);
3559                 ieee80211_recalc_ps(local, -1);
3560                 mutex_unlock(&local->iflist_mtx);
3561
3562                 ieee80211_recalc_ps_vif(sdata);
3563         }
3564
3565         if (elems.erp_info) {
3566                 erp_valid = true;
3567                 erp_value = elems.erp_info[0];
3568         } else {
3569                 erp_valid = false;
3570         }
3571         changed |= ieee80211_handle_bss_capability(sdata,
3572                         le16_to_cpu(mgmt->u.beacon.capab_info),
3573                         erp_valid, erp_value);
3574
3575         mutex_lock(&local->sta_mtx);
3576         sta = sta_info_get(sdata, bssid);
3577
3578         if (ieee80211_config_bw(sdata, sta,
3579                                 elems.ht_cap_elem, elems.ht_operation,
3580                                 elems.vht_operation, bssid, &changed)) {
3581                 mutex_unlock(&local->sta_mtx);
3582                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3583                                        WLAN_REASON_DEAUTH_LEAVING,
3584                                        true, deauth_buf);
3585                 ieee80211_report_disconnect(sdata, deauth_buf,
3586                                             sizeof(deauth_buf), true,
3587                                             WLAN_REASON_DEAUTH_LEAVING);
3588                 return;
3589         }
3590
3591         if (sta && elems.opmode_notif)
3592                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3593                                             rx_status->band, true);
3594         mutex_unlock(&local->sta_mtx);
3595
3596         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3597                                                elems.country_elem,
3598                                                elems.country_elem_len,
3599                                                elems.pwr_constr_elem,
3600                                                elems.cisco_dtpc_elem);
3601
3602         ieee80211_bss_info_change_notify(sdata, changed);
3603 }
3604
3605 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3606                                   struct sk_buff *skb)
3607 {
3608         struct ieee80211_rx_status *rx_status;
3609         struct ieee80211_mgmt *mgmt;
3610         u16 fc;
3611         struct ieee802_11_elems elems;
3612         int ies_len;
3613
3614         rx_status = (struct ieee80211_rx_status *) skb->cb;
3615         mgmt = (struct ieee80211_mgmt *) skb->data;
3616         fc = le16_to_cpu(mgmt->frame_control);
3617
3618         sdata_lock(sdata);
3619
3620         switch (fc & IEEE80211_FCTL_STYPE) {
3621         case IEEE80211_STYPE_BEACON:
3622                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3623                 break;
3624         case IEEE80211_STYPE_PROBE_RESP:
3625                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3626                 break;
3627         case IEEE80211_STYPE_AUTH:
3628                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3629                 break;
3630         case IEEE80211_STYPE_DEAUTH:
3631                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3632                 break;
3633         case IEEE80211_STYPE_DISASSOC:
3634                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3635                 break;
3636         case IEEE80211_STYPE_ASSOC_RESP:
3637         case IEEE80211_STYPE_REASSOC_RESP:
3638                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3639                 break;
3640         case IEEE80211_STYPE_ACTION:
3641                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3642                         ies_len = skb->len -
3643                                   offsetof(struct ieee80211_mgmt,
3644                                            u.action.u.chan_switch.variable);
3645
3646                         if (ies_len < 0)
3647                                 break;
3648
3649                         ieee802_11_parse_elems(
3650                                 mgmt->u.action.u.chan_switch.variable,
3651                                 ies_len, true, &elems);
3652
3653                         if (elems.parse_error)
3654                                 break;
3655
3656                         ieee80211_sta_process_chanswitch(sdata,
3657                                                  rx_status->mactime,
3658                                                  rx_status->device_timestamp,
3659                                                  &elems, false);
3660                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3661                         ies_len = skb->len -
3662                                   offsetof(struct ieee80211_mgmt,
3663                                            u.action.u.ext_chan_switch.variable);
3664
3665                         if (ies_len < 0)
3666                                 break;
3667
3668                         ieee802_11_parse_elems(
3669                                 mgmt->u.action.u.ext_chan_switch.variable,
3670                                 ies_len, true, &elems);
3671
3672                         if (elems.parse_error)
3673                                 break;
3674
3675                         /* for the handling code pretend this was also an IE */
3676                         elems.ext_chansw_ie =
3677                                 &mgmt->u.action.u.ext_chan_switch.data;
3678
3679                         ieee80211_sta_process_chanswitch(sdata,
3680                                                  rx_status->mactime,
3681                                                  rx_status->device_timestamp,
3682                                                  &elems, false);
3683                 }
3684                 break;
3685         }
3686         sdata_unlock(sdata);
3687 }
3688
3689 static void ieee80211_sta_timer(unsigned long data)
3690 {
3691         struct ieee80211_sub_if_data *sdata =
3692                 (struct ieee80211_sub_if_data *) data;
3693
3694         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3695 }
3696
3697 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3698                                           u8 *bssid, u8 reason, bool tx)
3699 {
3700         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3701
3702         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3703                                tx, frame_buf);
3704
3705         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3706                                     reason);
3707 }
3708
3709 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3710 {
3711         struct ieee80211_local *local = sdata->local;
3712         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3713         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3714         u32 tx_flags = 0;
3715
3716         sdata_assert_lock(sdata);
3717
3718         if (WARN_ON_ONCE(!auth_data))
3719                 return -EINVAL;
3720
3721         auth_data->tries++;
3722
3723         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3724                 sdata_info(sdata, "authentication with %pM timed out\n",
3725                            auth_data->bss->bssid);
3726
3727                 /*
3728                  * Most likely AP is not in the range so remove the
3729                  * bss struct for that AP.
3730                  */
3731                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3732
3733                 return -ETIMEDOUT;
3734         }
3735
3736         drv_mgd_prepare_tx(local, sdata);
3737
3738         if (auth_data->bss->proberesp_ies) {
3739                 u16 trans = 1;
3740                 u16 status = 0;
3741
3742                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3743                            auth_data->bss->bssid, auth_data->tries,
3744                            IEEE80211_AUTH_MAX_TRIES);
3745
3746                 auth_data->expected_transaction = 2;
3747
3748                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3749                         trans = auth_data->sae_trans;
3750                         status = auth_data->sae_status;
3751                         auth_data->expected_transaction = trans;
3752                 }
3753
3754                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3755                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3756                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3757
3758                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3759                                     auth_data->data, auth_data->data_len,
3760                                     auth_data->bss->bssid,
3761                                     auth_data->bss->bssid, NULL, 0, 0,
3762                                     tx_flags);
3763         } else {
3764                 const u8 *ssidie;
3765
3766                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3767                            auth_data->bss->bssid, auth_data->tries,
3768                            IEEE80211_AUTH_MAX_TRIES);
3769
3770                 rcu_read_lock();
3771                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3772                 if (!ssidie) {
3773                         rcu_read_unlock();
3774                         return -EINVAL;
3775                 }
3776                 /*
3777                  * Direct probe is sent to broadcast address as some APs
3778                  * will not answer to direct packet in unassociated state.
3779                  */
3780                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
3781                                          ssidie + 2, ssidie[1],
3782                                          NULL, 0, (u32) -1, true, 0,
3783                                          auth_data->bss->channel, false);
3784                 rcu_read_unlock();
3785         }
3786
3787         if (tx_flags == 0) {
3788                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3789                 auth_data->timeout_started = true;
3790                 run_again(sdata, auth_data->timeout);
3791         } else {
3792                 auth_data->timeout =
3793                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3794                 auth_data->timeout_started = true;
3795                 run_again(sdata, auth_data->timeout);
3796         }
3797
3798         return 0;
3799 }
3800
3801 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3802 {
3803         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3804         struct ieee80211_local *local = sdata->local;
3805
3806         sdata_assert_lock(sdata);
3807
3808         assoc_data->tries++;
3809         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3810                 sdata_info(sdata, "association with %pM timed out\n",
3811                            assoc_data->bss->bssid);
3812
3813                 /*
3814                  * Most likely AP is not in the range so remove the
3815                  * bss struct for that AP.
3816                  */
3817                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3818
3819                 return -ETIMEDOUT;
3820         }
3821
3822         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3823                    assoc_data->bss->bssid, assoc_data->tries,
3824                    IEEE80211_ASSOC_MAX_TRIES);
3825         ieee80211_send_assoc(sdata);
3826
3827         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3828                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3829                 assoc_data->timeout_started = true;
3830                 run_again(sdata, assoc_data->timeout);
3831         } else {
3832                 assoc_data->timeout =
3833                         round_jiffies_up(jiffies +
3834                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3835                 assoc_data->timeout_started = true;
3836                 run_again(sdata, assoc_data->timeout);
3837         }
3838
3839         return 0;
3840 }
3841
3842 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3843                                   __le16 fc, bool acked)
3844 {
3845         struct ieee80211_local *local = sdata->local;
3846
3847         sdata->u.mgd.status_fc = fc;
3848         sdata->u.mgd.status_acked = acked;
3849         sdata->u.mgd.status_received = true;
3850
3851         ieee80211_queue_work(&local->hw, &sdata->work);
3852 }
3853
3854 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3855 {
3856         struct ieee80211_local *local = sdata->local;
3857         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3858
3859         sdata_lock(sdata);
3860
3861         if (ifmgd->status_received) {
3862                 __le16 fc = ifmgd->status_fc;
3863                 bool status_acked = ifmgd->status_acked;
3864
3865                 ifmgd->status_received = false;
3866                 if (ifmgd->auth_data &&
3867                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3868                         if (status_acked) {
3869                                 ifmgd->auth_data->timeout =
3870                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3871                                 run_again(sdata, ifmgd->auth_data->timeout);
3872                         } else {
3873                                 ifmgd->auth_data->timeout = jiffies - 1;
3874                         }
3875                         ifmgd->auth_data->timeout_started = true;
3876                 } else if (ifmgd->assoc_data &&
3877                            (ieee80211_is_assoc_req(fc) ||
3878                             ieee80211_is_reassoc_req(fc))) {
3879                         if (status_acked) {
3880                                 ifmgd->assoc_data->timeout =
3881                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3882                                 run_again(sdata, ifmgd->assoc_data->timeout);
3883                         } else {
3884                                 ifmgd->assoc_data->timeout = jiffies - 1;
3885                         }
3886                         ifmgd->assoc_data->timeout_started = true;
3887                 }
3888         }
3889
3890         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3891             time_after(jiffies, ifmgd->auth_data->timeout)) {
3892                 if (ifmgd->auth_data->done) {
3893                         /*
3894                          * ok ... we waited for assoc but userspace didn't,
3895                          * so let's just kill the auth data
3896                          */
3897                         ieee80211_destroy_auth_data(sdata, false);
3898                 } else if (ieee80211_probe_auth(sdata)) {
3899                         u8 bssid[ETH_ALEN];
3900                         struct ieee80211_event event = {
3901                                 .type = MLME_EVENT,
3902                                 .u.mlme.data = AUTH_EVENT,
3903                                 .u.mlme.status = MLME_TIMEOUT,
3904                         };
3905
3906                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3907
3908                         ieee80211_destroy_auth_data(sdata, false);
3909
3910                         cfg80211_auth_timeout(sdata->dev, bssid);
3911                         drv_event_callback(sdata->local, sdata, &event);
3912                 }
3913         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3914                 run_again(sdata, ifmgd->auth_data->timeout);
3915
3916         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3917             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3918                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3919                     ieee80211_do_assoc(sdata)) {
3920                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3921                         struct ieee80211_event event = {
3922                                 .type = MLME_EVENT,
3923                                 .u.mlme.data = ASSOC_EVENT,
3924                                 .u.mlme.status = MLME_TIMEOUT,
3925                         };
3926
3927                         ieee80211_destroy_assoc_data(sdata, false);
3928                         cfg80211_assoc_timeout(sdata->dev, bss);
3929                         drv_event_callback(sdata->local, sdata, &event);
3930                 }
3931         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3932                 run_again(sdata, ifmgd->assoc_data->timeout);
3933
3934         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3935             ifmgd->associated) {
3936                 u8 bssid[ETH_ALEN];
3937                 int max_tries;
3938
3939                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3940
3941                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3942                         max_tries = max_nullfunc_tries;
3943                 else
3944                         max_tries = max_probe_tries;
3945
3946                 /* ACK received for nullfunc probing frame */
3947                 if (!ifmgd->probe_send_count)
3948                         ieee80211_reset_ap_probe(sdata);
3949                 else if (ifmgd->nullfunc_failed) {
3950                         if (ifmgd->probe_send_count < max_tries) {
3951                                 mlme_dbg(sdata,
3952                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3953                                          bssid, ifmgd->probe_send_count,
3954                                          max_tries);
3955                                 ieee80211_mgd_probe_ap_send(sdata);
3956                         } else {
3957                                 mlme_dbg(sdata,
3958                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3959                                          bssid);
3960                                 ieee80211_sta_connection_lost(sdata, bssid,
3961                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3962                                         false);
3963                         }
3964                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3965                         run_again(sdata, ifmgd->probe_timeout);
3966                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3967                         mlme_dbg(sdata,
3968                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3969                                  bssid, probe_wait_ms);
3970                         ieee80211_sta_connection_lost(sdata, bssid,
3971                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3972                 } else if (ifmgd->probe_send_count < max_tries) {
3973                         mlme_dbg(sdata,
3974                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3975                                  bssid, probe_wait_ms,
3976                                  ifmgd->probe_send_count, max_tries);
3977                         ieee80211_mgd_probe_ap_send(sdata);
3978                 } else {
3979                         /*
3980                          * We actually lost the connection ... or did we?
3981                          * Let's make sure!
3982                          */
3983                         wiphy_debug(local->hw.wiphy,
3984                                     "%s: No probe response from AP %pM"
3985                                     " after %dms, disconnecting.\n",
3986                                     sdata->name,
3987                                     bssid, probe_wait_ms);
3988
3989                         ieee80211_sta_connection_lost(sdata, bssid,
3990                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3991                 }
3992         }
3993
3994         sdata_unlock(sdata);
3995 }
3996
3997 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3998 {
3999         struct ieee80211_sub_if_data *sdata =
4000                 (struct ieee80211_sub_if_data *) data;
4001         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4002
4003         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4004                 return;
4005
4006         sdata->u.mgd.connection_loss = false;
4007         ieee80211_queue_work(&sdata->local->hw,
4008                              &sdata->u.mgd.beacon_connection_loss_work);
4009 }
4010
4011 static void ieee80211_sta_conn_mon_timer(unsigned long data)
4012 {
4013         struct ieee80211_sub_if_data *sdata =
4014                 (struct ieee80211_sub_if_data *) data;
4015         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4016         struct ieee80211_local *local = sdata->local;
4017
4018         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4019                 return;
4020
4021         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4022 }
4023
4024 static void ieee80211_sta_monitor_work(struct work_struct *work)
4025 {
4026         struct ieee80211_sub_if_data *sdata =
4027                 container_of(work, struct ieee80211_sub_if_data,
4028                              u.mgd.monitor_work);
4029
4030         ieee80211_mgd_probe_ap(sdata, false);
4031 }
4032
4033 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4034 {
4035         u32 flags;
4036
4037         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4038                 __ieee80211_stop_poll(sdata);
4039
4040                 /* let's probe the connection once */
4041                 flags = sdata->local->hw.flags;
4042                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
4043                         ieee80211_queue_work(&sdata->local->hw,
4044                                              &sdata->u.mgd.monitor_work);
4045                 /* and do all the other regular work too */
4046                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
4047         }
4048 }
4049
4050 #ifdef CONFIG_PM
4051 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4052 {
4053         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4054         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4055
4056         sdata_lock(sdata);
4057
4058         if (ifmgd->auth_data || ifmgd->assoc_data) {
4059                 const u8 *bssid = ifmgd->auth_data ?
4060                                 ifmgd->auth_data->bss->bssid :
4061                                 ifmgd->assoc_data->bss->bssid;
4062
4063                 /*
4064                  * If we are trying to authenticate / associate while suspending,
4065                  * cfg80211 won't know and won't actually abort those attempts,
4066                  * thus we need to do that ourselves.
4067                  */
4068                 ieee80211_send_deauth_disassoc(sdata, bssid,
4069                                                IEEE80211_STYPE_DEAUTH,
4070                                                WLAN_REASON_DEAUTH_LEAVING,
4071                                                false, frame_buf);
4072                 if (ifmgd->assoc_data)
4073                         ieee80211_destroy_assoc_data(sdata, false);
4074                 if (ifmgd->auth_data)
4075                         ieee80211_destroy_auth_data(sdata, false);
4076                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4077                                       IEEE80211_DEAUTH_FRAME_LEN);
4078         }
4079
4080         /* This is a bit of a hack - we should find a better and more generic
4081          * solution to this. Normally when suspending, cfg80211 will in fact
4082          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4083          * auth (not so important) or assoc (this is the problem) process.
4084          *
4085          * As a consequence, it can happen that we are in the process of both
4086          * associating and suspending, and receive an association response
4087          * after cfg80211 has checked if it needs to disconnect, but before
4088          * we actually set the flag to drop incoming frames. This will then
4089          * cause the workqueue flush to process the association response in
4090          * the suspend, resulting in a successful association just before it
4091          * tries to remove the interface from the driver, which now though
4092          * has a channel context assigned ... this results in issues.
4093          *
4094          * To work around this (for now) simply deauth here again if we're
4095          * now connected.
4096          */
4097         if (ifmgd->associated && !sdata->local->wowlan) {
4098                 u8 bssid[ETH_ALEN];
4099                 struct cfg80211_deauth_request req = {
4100                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4101                         .bssid = bssid,
4102                 };
4103
4104                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4105                 ieee80211_mgd_deauth(sdata, &req);
4106         }
4107
4108         sdata_unlock(sdata);
4109 }
4110
4111 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4112 {
4113         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4114
4115         sdata_lock(sdata);
4116         if (!ifmgd->associated) {
4117                 sdata_unlock(sdata);
4118                 return;
4119         }
4120
4121         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4122                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4123                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4124                 ieee80211_sta_connection_lost(sdata,
4125                                               ifmgd->associated->bssid,
4126                                               WLAN_REASON_UNSPECIFIED,
4127                                               true);
4128                 sdata_unlock(sdata);
4129                 return;
4130         }
4131         sdata_unlock(sdata);
4132 }
4133 #endif
4134
4135 /* interface setup */
4136 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4137 {
4138         struct ieee80211_if_managed *ifmgd;
4139
4140         ifmgd = &sdata->u.mgd;
4141         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4142         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4143         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4144                   ieee80211_beacon_connection_loss_work);
4145         INIT_WORK(&ifmgd->csa_connection_drop_work,
4146                   ieee80211_csa_connection_drop_work);
4147         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4148         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4149                           ieee80211_tdls_peer_del_work);
4150         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4151                     (unsigned long) sdata);
4152         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4153                     (unsigned long) sdata);
4154         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4155                     (unsigned long) sdata);
4156         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4157                     (unsigned long) sdata);
4158         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4159                           ieee80211_sta_handle_tspec_ac_params_wk);
4160
4161         ifmgd->flags = 0;
4162         ifmgd->powersave = sdata->wdev.ps;
4163         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4164         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4165         ifmgd->p2p_noa_index = -1;
4166
4167         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4168                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4169         else
4170                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4171
4172         /* Setup TDLS data */
4173         spin_lock_init(&ifmgd->teardown_lock);
4174         ifmgd->teardown_skb = NULL;
4175         ifmgd->orig_teardown_skb = NULL;
4176 }
4177
4178 /* scan finished notification */
4179 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4180 {
4181         struct ieee80211_sub_if_data *sdata;
4182
4183         /* Restart STA timers */
4184         rcu_read_lock();
4185         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4186                 if (ieee80211_sdata_running(sdata))
4187                         ieee80211_restart_sta_timer(sdata);
4188         }
4189         rcu_read_unlock();
4190 }
4191
4192 int ieee80211_max_network_latency(struct notifier_block *nb,
4193                                   unsigned long data, void *dummy)
4194 {
4195         s32 latency_usec = (s32) data;
4196         struct ieee80211_local *local =
4197                 container_of(nb, struct ieee80211_local,
4198                              network_latency_notifier);
4199
4200         mutex_lock(&local->iflist_mtx);
4201         ieee80211_recalc_ps(local, latency_usec);
4202         mutex_unlock(&local->iflist_mtx);
4203
4204         return NOTIFY_OK;
4205 }
4206
4207 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4208                                      struct cfg80211_bss *cbss)
4209 {
4210         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4211         const u8 *ht_cap_ie, *vht_cap_ie;
4212         const struct ieee80211_ht_cap *ht_cap;
4213         const struct ieee80211_vht_cap *vht_cap;
4214         u8 chains = 1;
4215
4216         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4217                 return chains;
4218
4219         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4220         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4221                 ht_cap = (void *)(ht_cap_ie + 2);
4222                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4223                 /*
4224                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4225                  *       "Tx Unequal Modulation Supported" fields.
4226                  */
4227         }
4228
4229         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4230                 return chains;
4231
4232         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4233         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4234                 u8 nss;
4235                 u16 tx_mcs_map;
4236
4237                 vht_cap = (void *)(vht_cap_ie + 2);
4238                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4239                 for (nss = 8; nss > 0; nss--) {
4240                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4241                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4242                                 break;
4243                 }
4244                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4245                 chains = max(chains, nss);
4246         }
4247
4248         return chains;
4249 }
4250
4251 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4252                                   struct cfg80211_bss *cbss)
4253 {
4254         struct ieee80211_local *local = sdata->local;
4255         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4256         const struct ieee80211_ht_cap *ht_cap = NULL;
4257         const struct ieee80211_ht_operation *ht_oper = NULL;
4258         const struct ieee80211_vht_operation *vht_oper = NULL;
4259         struct ieee80211_supported_band *sband;
4260         struct cfg80211_chan_def chandef;
4261         int ret;
4262
4263         sband = local->hw.wiphy->bands[cbss->channel->band];
4264
4265         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4266                           IEEE80211_STA_DISABLE_80P80MHZ |
4267                           IEEE80211_STA_DISABLE_160MHZ);
4268
4269         rcu_read_lock();
4270
4271         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4272             sband->ht_cap.ht_supported) {
4273                 const u8 *ht_oper_ie, *ht_cap_ie;
4274
4275                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4276                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4277                         ht_oper = (void *)(ht_oper_ie + 2);
4278
4279                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4280                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4281                         ht_cap = (void *)(ht_cap_ie + 2);
4282
4283                 if (!ht_cap) {
4284                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4285                         ht_oper = NULL;
4286                 }
4287         }
4288
4289         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4290             sband->vht_cap.vht_supported) {
4291                 const u8 *vht_oper_ie, *vht_cap;
4292
4293                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4294                                                    WLAN_EID_VHT_OPERATION);
4295                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4296                         vht_oper = (void *)(vht_oper_ie + 2);
4297                 if (vht_oper && !ht_oper) {
4298                         vht_oper = NULL;
4299                         sdata_info(sdata,
4300                                    "AP advertised VHT without HT, disabling both\n");
4301                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4302                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4303                 }
4304
4305                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4306                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4307                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4308                         vht_oper = NULL;
4309                 }
4310         }
4311
4312         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4313                                                      cbss->channel,
4314                                                      ht_cap, ht_oper, vht_oper,
4315                                                      &chandef, false);
4316
4317         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4318                                       local->rx_chains);
4319
4320         rcu_read_unlock();
4321
4322         /* will change later if needed */
4323         sdata->smps_mode = IEEE80211_SMPS_OFF;
4324
4325         mutex_lock(&local->mtx);
4326         /*
4327          * If this fails (possibly due to channel context sharing
4328          * on incompatible channels, e.g. 80+80 and 160 sharing the
4329          * same control channel) try to use a smaller bandwidth.
4330          */
4331         ret = ieee80211_vif_use_channel(sdata, &chandef,
4332                                         IEEE80211_CHANCTX_SHARED);
4333
4334         /* don't downgrade for 5 and 10 MHz channels, though. */
4335         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4336             chandef.width == NL80211_CHAN_WIDTH_10)
4337                 goto out;
4338
4339         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4340                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4341                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4342                                                 IEEE80211_CHANCTX_SHARED);
4343         }
4344  out:
4345         mutex_unlock(&local->mtx);
4346         return ret;
4347 }
4348
4349 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4350                                      struct cfg80211_bss *cbss, bool assoc,
4351                                      bool override)
4352 {
4353         struct ieee80211_local *local = sdata->local;
4354         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4355         struct ieee80211_bss *bss = (void *)cbss->priv;
4356         struct sta_info *new_sta = NULL;
4357         struct ieee80211_supported_band *sband;
4358         bool have_sta = false;
4359         int err;
4360
4361         sband = local->hw.wiphy->bands[cbss->channel->band];
4362
4363         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4364                 return -EINVAL;
4365
4366         if (assoc) {
4367                 rcu_read_lock();
4368                 have_sta = sta_info_get(sdata, cbss->bssid);
4369                 rcu_read_unlock();
4370         }
4371
4372         if (!have_sta) {
4373                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4374                 if (!new_sta)
4375                         return -ENOMEM;
4376         }
4377
4378         if (new_sta || override) {
4379                 err = ieee80211_prep_channel(sdata, cbss);
4380                 if (err) {
4381                         if (new_sta)
4382                                 sta_info_free(local, new_sta);
4383                         return -EINVAL;
4384                 }
4385         }
4386
4387         if (new_sta) {
4388                 u32 rates = 0, basic_rates = 0;
4389                 bool have_higher_than_11mbit;
4390                 int min_rate = INT_MAX, min_rate_index = -1;
4391                 struct ieee80211_chanctx_conf *chanctx_conf;
4392                 const struct cfg80211_bss_ies *ies;
4393                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4394                 u32 rate_flags;
4395
4396                 rcu_read_lock();
4397                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4398                 if (WARN_ON(!chanctx_conf)) {
4399                         rcu_read_unlock();
4400                         sta_info_free(local, new_sta);
4401                         return -EINVAL;
4402                 }
4403                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4404                 rcu_read_unlock();
4405
4406                 ieee80211_get_rates(sband, bss->supp_rates,
4407                                     bss->supp_rates_len,
4408                                     &rates, &basic_rates,
4409                                     &have_higher_than_11mbit,
4410                                     &min_rate, &min_rate_index,
4411                                     shift, rate_flags);
4412
4413                 /*
4414                  * This used to be a workaround for basic rates missing
4415                  * in the association response frame. Now that we no
4416                  * longer use the basic rates from there, it probably
4417                  * doesn't happen any more, but keep the workaround so
4418                  * in case some *other* APs are buggy in different ways
4419                  * we can connect -- with a warning.
4420                  */
4421                 if (!basic_rates && min_rate_index >= 0) {
4422                         sdata_info(sdata,
4423                                    "No basic rates, using min rate instead\n");
4424                         basic_rates = BIT(min_rate_index);
4425                 }
4426
4427                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4428                 sdata->vif.bss_conf.basic_rates = basic_rates;
4429
4430                 /* cf. IEEE 802.11 9.2.12 */
4431                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4432                     have_higher_than_11mbit)
4433                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4434                 else
4435                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4436
4437                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4438
4439                 /* set timing information */
4440                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4441                 rcu_read_lock();
4442                 ies = rcu_dereference(cbss->beacon_ies);
4443                 if (ies) {
4444                         const u8 *tim_ie;
4445
4446                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4447                         sdata->vif.bss_conf.sync_device_ts =
4448                                 bss->device_ts_beacon;
4449                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4450                                                   ies->data, ies->len);
4451                         if (tim_ie && tim_ie[1] >= 2)
4452                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4453                         else
4454                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4455                 } else if (!(local->hw.flags &
4456                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4457                         ies = rcu_dereference(cbss->proberesp_ies);
4458                         /* must be non-NULL since beacon IEs were NULL */
4459                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4460                         sdata->vif.bss_conf.sync_device_ts =
4461                                 bss->device_ts_presp;
4462                         sdata->vif.bss_conf.sync_dtim_count = 0;
4463                 } else {
4464                         sdata->vif.bss_conf.sync_tsf = 0;
4465                         sdata->vif.bss_conf.sync_device_ts = 0;
4466                         sdata->vif.bss_conf.sync_dtim_count = 0;
4467                 }
4468                 rcu_read_unlock();
4469
4470                 /* tell driver about BSSID, basic rates and timing */
4471                 ieee80211_bss_info_change_notify(sdata,
4472                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4473                         BSS_CHANGED_BEACON_INT);
4474
4475                 if (assoc)
4476                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4477
4478                 err = sta_info_insert(new_sta);
4479                 new_sta = NULL;
4480                 if (err) {
4481                         sdata_info(sdata,
4482                                    "failed to insert STA entry for the AP (error %d)\n",
4483                                    err);
4484                         return err;
4485                 }
4486         } else
4487                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4488
4489         /* Cancel scan to ensure that nothing interferes with connection */
4490         if (local->scanning)
4491                 ieee80211_scan_cancel(local);
4492
4493         return 0;
4494 }
4495
4496 /* config hooks */
4497 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4498                        struct cfg80211_auth_request *req)
4499 {
4500         struct ieee80211_local *local = sdata->local;
4501         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4502         struct ieee80211_mgd_auth_data *auth_data;
4503         u16 auth_alg;
4504         int err;
4505
4506         /* prepare auth data structure */
4507
4508         switch (req->auth_type) {
4509         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4510                 auth_alg = WLAN_AUTH_OPEN;
4511                 break;
4512         case NL80211_AUTHTYPE_SHARED_KEY:
4513                 if (IS_ERR(local->wep_tx_tfm))
4514                         return -EOPNOTSUPP;
4515                 auth_alg = WLAN_AUTH_SHARED_KEY;
4516                 break;
4517         case NL80211_AUTHTYPE_FT:
4518                 auth_alg = WLAN_AUTH_FT;
4519                 break;
4520         case NL80211_AUTHTYPE_NETWORK_EAP:
4521                 auth_alg = WLAN_AUTH_LEAP;
4522                 break;
4523         case NL80211_AUTHTYPE_SAE:
4524                 auth_alg = WLAN_AUTH_SAE;
4525                 break;
4526         default:
4527                 return -EOPNOTSUPP;
4528         }
4529
4530         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4531                             req->ie_len, GFP_KERNEL);
4532         if (!auth_data)
4533                 return -ENOMEM;
4534
4535         auth_data->bss = req->bss;
4536
4537         if (req->sae_data_len >= 4) {
4538                 __le16 *pos = (__le16 *) req->sae_data;
4539                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4540                 auth_data->sae_status = le16_to_cpu(pos[1]);
4541                 memcpy(auth_data->data, req->sae_data + 4,
4542                        req->sae_data_len - 4);
4543                 auth_data->data_len += req->sae_data_len - 4;
4544         }
4545
4546         if (req->ie && req->ie_len) {
4547                 memcpy(&auth_data->data[auth_data->data_len],
4548                        req->ie, req->ie_len);
4549                 auth_data->data_len += req->ie_len;
4550         }
4551
4552         if (req->key && req->key_len) {
4553                 auth_data->key_len = req->key_len;
4554                 auth_data->key_idx = req->key_idx;
4555                 memcpy(auth_data->key, req->key, req->key_len);
4556         }
4557
4558         auth_data->algorithm = auth_alg;
4559
4560         /* try to authenticate/probe */
4561
4562         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4563             ifmgd->assoc_data) {
4564                 err = -EBUSY;
4565                 goto err_free;
4566         }
4567
4568         if (ifmgd->auth_data)
4569                 ieee80211_destroy_auth_data(sdata, false);
4570
4571         /* prep auth_data so we don't go into idle on disassoc */
4572         ifmgd->auth_data = auth_data;
4573
4574         if (ifmgd->associated) {
4575                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4576
4577                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4578                                        WLAN_REASON_UNSPECIFIED,
4579                                        false, frame_buf);
4580
4581                 ieee80211_report_disconnect(sdata, frame_buf,
4582                                             sizeof(frame_buf), true,
4583                                             WLAN_REASON_UNSPECIFIED);
4584         }
4585
4586         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4587
4588         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4589         if (err)
4590                 goto err_clear;
4591
4592         err = ieee80211_probe_auth(sdata);
4593         if (err) {
4594                 sta_info_destroy_addr(sdata, req->bss->bssid);
4595                 goto err_clear;
4596         }
4597
4598         /* hold our own reference */
4599         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4600         return 0;
4601
4602  err_clear:
4603         eth_zero_addr(ifmgd->bssid);
4604         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4605         ifmgd->auth_data = NULL;
4606  err_free:
4607         kfree(auth_data);
4608         return err;
4609 }
4610
4611 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4612                                         const u8 *wmm_param, int len)
4613 {
4614         const u8 *pos;
4615         size_t left;
4616
4617         if (len < 8)
4618                 return false;
4619
4620         if (wmm_param[5] != 1 /* version */)
4621                 return false;
4622
4623         pos = wmm_param + 8;
4624         left = len - 8;
4625
4626         for (; left >= 4; left -= 4, pos += 4) {
4627                 u8 aifsn = pos[0] & 0x0f;
4628                 u8 ecwmin = pos[1] & 0x0f;
4629                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4630                 int aci = (pos[0] >> 5) & 0x03;
4631
4632                 if (aifsn < 2) {
4633                         sdata_info(sdata,
4634                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4635                                    aifsn, aci);
4636                         return false;
4637                 }
4638                 if (ecwmin > ecwmax) {
4639                         sdata_info(sdata,
4640                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4641                                    ecwmin, ecwmax, aci);
4642                         return false;
4643                 }
4644         }
4645
4646         return true;
4647 }
4648
4649 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4650                         struct cfg80211_assoc_request *req)
4651 {
4652         struct ieee80211_local *local = sdata->local;
4653         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4654         struct ieee80211_bss *bss = (void *)req->bss->priv;
4655         struct ieee80211_mgd_assoc_data *assoc_data;
4656         const struct cfg80211_bss_ies *beacon_ies;
4657         struct ieee80211_supported_band *sband;
4658         const u8 *ssidie, *ht_ie, *vht_ie;
4659         int i, err;
4660         bool override = false;
4661
4662         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4663         if (!assoc_data)
4664                 return -ENOMEM;
4665
4666         rcu_read_lock();
4667         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4668         if (!ssidie) {
4669                 rcu_read_unlock();
4670                 kfree(assoc_data);
4671                 return -EINVAL;
4672         }
4673         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4674         assoc_data->ssid_len = ssidie[1];
4675         rcu_read_unlock();
4676
4677         if (ifmgd->associated) {
4678                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4679
4680                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4681                                        WLAN_REASON_UNSPECIFIED,
4682                                        false, frame_buf);
4683
4684                 ieee80211_report_disconnect(sdata, frame_buf,
4685                                             sizeof(frame_buf), true,
4686                                             WLAN_REASON_UNSPECIFIED);
4687         }
4688
4689         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4690                 err = -EBUSY;
4691                 goto err_free;
4692         }
4693
4694         if (ifmgd->assoc_data) {
4695                 err = -EBUSY;
4696                 goto err_free;
4697         }
4698
4699         if (ifmgd->auth_data) {
4700                 bool match;
4701
4702                 /* keep sta info, bssid if matching */
4703                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4704                 ieee80211_destroy_auth_data(sdata, match);
4705         }
4706
4707         /* prepare assoc data */
4708
4709         ifmgd->beacon_crc_valid = false;
4710
4711         assoc_data->wmm = bss->wmm_used &&
4712                           (local->hw.queues >= IEEE80211_NUM_ACS);
4713         if (assoc_data->wmm) {
4714                 /* try to check validity of WMM params IE */
4715                 const struct cfg80211_bss_ies *ies;
4716                 const u8 *wp, *start, *end;
4717
4718                 rcu_read_lock();
4719                 ies = rcu_dereference(req->bss->ies);
4720                 start = ies->data;
4721                 end = start + ies->len;
4722
4723                 while (true) {
4724                         wp = cfg80211_find_vendor_ie(
4725                                 WLAN_OUI_MICROSOFT,
4726                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4727                                 start, end - start);
4728                         if (!wp)
4729                                 break;
4730                         start = wp + wp[1] + 2;
4731                         /* if this IE is too short, try the next */
4732                         if (wp[1] <= 4)
4733                                 continue;
4734                         /* if this IE is WMM params, we found what we wanted */
4735                         if (wp[6] == 1)
4736                                 break;
4737                 }
4738
4739                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4740                                                         wp[1] - 2)) {
4741                         assoc_data->wmm = false;
4742                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4743                 }
4744                 rcu_read_unlock();
4745         }
4746
4747         /*
4748          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4749          * We still associate in non-HT mode (11a/b/g) if any one of these
4750          * ciphers is configured as pairwise.
4751          * We can set this to true for non-11n hardware, that'll be checked
4752          * separately along with the peer capabilities.
4753          */
4754         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4755                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4756                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4757                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4758                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4759                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4760                         netdev_info(sdata->dev,
4761                                     "disabling HT/VHT due to WEP/TKIP use\n");
4762                 }
4763         }
4764
4765         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4766         sband = local->hw.wiphy->bands[req->bss->channel->band];
4767         if (!sband->ht_cap.ht_supported ||
4768             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4769             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4770                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4771                 if (!bss->wmm_used &&
4772                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4773                         netdev_info(sdata->dev,
4774                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4775         }
4776
4777         /* disable VHT if we don't support it or the AP doesn't use WMM */
4778         if (!sband->vht_cap.vht_supported ||
4779             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4780             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4781                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4782                 if (!bss->wmm_used &&
4783                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4784                         netdev_info(sdata->dev,
4785                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4786         }
4787
4788         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4789         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4790                sizeof(ifmgd->ht_capa_mask));
4791
4792         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4793         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4794                sizeof(ifmgd->vht_capa_mask));
4795
4796         if (req->ie && req->ie_len) {
4797                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4798                 assoc_data->ie_len = req->ie_len;
4799         }
4800
4801         assoc_data->bss = req->bss;
4802
4803         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4804                 if (ifmgd->powersave)
4805                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4806                 else
4807                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4808         } else
4809                 sdata->smps_mode = ifmgd->req_smps;
4810
4811         assoc_data->capability = req->bss->capability;
4812         assoc_data->supp_rates = bss->supp_rates;
4813         assoc_data->supp_rates_len = bss->supp_rates_len;
4814
4815         rcu_read_lock();
4816         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4817         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4818                 assoc_data->ap_ht_param =
4819                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4820         else
4821                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4822         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4823         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4824                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4825                        sizeof(struct ieee80211_vht_cap));
4826         else
4827                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4828         rcu_read_unlock();
4829
4830         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4831                  (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
4832              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4833                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4834
4835         if (bss->wmm_used && bss->uapsd_supported &&
4836             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4837                 assoc_data->uapsd = true;
4838                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4839         } else {
4840                 assoc_data->uapsd = false;
4841                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4842         }
4843
4844         if (req->prev_bssid)
4845                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4846
4847         if (req->use_mfp) {
4848                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4849                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4850         } else {
4851                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4852                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4853         }
4854
4855         if (req->flags & ASSOC_REQ_USE_RRM)
4856                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4857         else
4858                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4859
4860         if (req->crypto.control_port)
4861                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4862         else
4863                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4864
4865         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4866         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4867         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4868                                                         sdata->vif.type);
4869
4870         /* kick off associate process */
4871
4872         ifmgd->assoc_data = assoc_data;
4873         ifmgd->dtim_period = 0;
4874         ifmgd->have_beacon = false;
4875
4876         /* override HT/VHT configuration only if the AP and we support it */
4877         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4878                 struct ieee80211_sta_ht_cap sta_ht_cap;
4879
4880                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4881                         override = true;
4882
4883                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4884                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4885
4886                 /* check for 40 MHz disable override */
4887                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4888                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4889                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4890                         override = true;
4891
4892                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4893                     req->flags & ASSOC_REQ_DISABLE_VHT)
4894                         override = true;
4895         }
4896
4897         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4898                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4899                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4900         }
4901
4902         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4903                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4904
4905         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4906         if (err)
4907                 goto err_clear;
4908
4909         rcu_read_lock();
4910         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4911
4912         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4913             !beacon_ies) {
4914                 /*
4915                  * Wait up to one beacon interval ...
4916                  * should this be more if we miss one?
4917                  */
4918                 sdata_info(sdata, "waiting for beacon from %pM\n",
4919                            ifmgd->bssid);
4920                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4921                 assoc_data->timeout_started = true;
4922                 assoc_data->need_beacon = true;
4923         } else if (beacon_ies) {
4924                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4925                                                     beacon_ies->data,
4926                                                     beacon_ies->len);
4927                 u8 dtim_count = 0;
4928
4929                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4930                         const struct ieee80211_tim_ie *tim;
4931                         tim = (void *)(tim_ie + 2);
4932                         ifmgd->dtim_period = tim->dtim_period;
4933                         dtim_count = tim->dtim_count;
4934                 }
4935                 ifmgd->have_beacon = true;
4936                 assoc_data->timeout = jiffies;
4937                 assoc_data->timeout_started = true;
4938
4939                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4940                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4941                         sdata->vif.bss_conf.sync_device_ts =
4942                                 bss->device_ts_beacon;
4943                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4944                 }
4945         } else {
4946                 assoc_data->timeout = jiffies;
4947                 assoc_data->timeout_started = true;
4948         }
4949         rcu_read_unlock();
4950
4951         run_again(sdata, assoc_data->timeout);
4952
4953         if (bss->corrupt_data) {
4954                 char *corrupt_type = "data";
4955                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4956                         if (bss->corrupt_data &
4957                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4958                                 corrupt_type = "beacon and probe response";
4959                         else
4960                                 corrupt_type = "beacon";
4961                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4962                         corrupt_type = "probe response";
4963                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4964                            corrupt_type);
4965         }
4966
4967         return 0;
4968  err_clear:
4969         eth_zero_addr(ifmgd->bssid);
4970         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4971         ifmgd->assoc_data = NULL;
4972  err_free:
4973         kfree(assoc_data);
4974         return err;
4975 }
4976
4977 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4978                          struct cfg80211_deauth_request *req)
4979 {
4980         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4981         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4982         bool tx = !req->local_state_change;
4983
4984         if (ifmgd->auth_data &&
4985             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4986                 sdata_info(sdata,
4987                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4988                            req->bssid, req->reason_code,
4989                            ieee80211_get_reason_code_string(req->reason_code));
4990
4991                 drv_mgd_prepare_tx(sdata->local, sdata);
4992                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4993                                                IEEE80211_STYPE_DEAUTH,
4994                                                req->reason_code, tx,
4995                                                frame_buf);
4996                 ieee80211_destroy_auth_data(sdata, false);
4997                 ieee80211_report_disconnect(sdata, frame_buf,
4998                                             sizeof(frame_buf), true,
4999                                             req->reason_code);
5000
5001                 return 0;
5002         }
5003
5004         if (ifmgd->associated &&
5005             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5006                 sdata_info(sdata,
5007                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
5008                            req->bssid, req->reason_code,
5009                            ieee80211_get_reason_code_string(req->reason_code));
5010
5011                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5012                                        req->reason_code, tx, frame_buf);
5013                 ieee80211_report_disconnect(sdata, frame_buf,
5014                                             sizeof(frame_buf), true,
5015                                             req->reason_code);
5016                 return 0;
5017         }
5018
5019         return -ENOTCONN;
5020 }
5021
5022 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5023                            struct cfg80211_disassoc_request *req)
5024 {
5025         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5026         u8 bssid[ETH_ALEN];
5027         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5028
5029         /*
5030          * cfg80211 should catch this ... but it's racy since
5031          * we can receive a disassoc frame, process it, hand it
5032          * to cfg80211 while that's in a locked section already
5033          * trying to tell us that the user wants to disconnect.
5034          */
5035         if (ifmgd->associated != req->bss)
5036                 return -ENOLINK;
5037
5038         sdata_info(sdata,
5039                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
5040                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5041
5042         memcpy(bssid, req->bss->bssid, ETH_ALEN);
5043         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5044                                req->reason_code, !req->local_state_change,
5045                                frame_buf);
5046
5047         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5048                                     req->reason_code);
5049
5050         return 0;
5051 }
5052
5053 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5054 {
5055         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5056
5057         /*
5058          * Make sure some work items will not run after this,
5059          * they will not do anything but might not have been
5060          * cancelled when disconnecting.
5061          */
5062         cancel_work_sync(&ifmgd->monitor_work);
5063         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5064         cancel_work_sync(&ifmgd->request_smps_work);
5065         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5066         cancel_work_sync(&ifmgd->chswitch_work);
5067         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5068
5069         sdata_lock(sdata);
5070         if (ifmgd->assoc_data) {
5071                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5072                 ieee80211_destroy_assoc_data(sdata, false);
5073                 cfg80211_assoc_timeout(sdata->dev, bss);
5074         }
5075         if (ifmgd->auth_data)
5076                 ieee80211_destroy_auth_data(sdata, false);
5077         spin_lock_bh(&ifmgd->teardown_lock);
5078         if (ifmgd->teardown_skb) {
5079                 kfree_skb(ifmgd->teardown_skb);
5080                 ifmgd->teardown_skb = NULL;
5081                 ifmgd->orig_teardown_skb = NULL;
5082         }
5083         spin_unlock_bh(&ifmgd->teardown_lock);
5084         del_timer_sync(&ifmgd->timer);
5085         sdata_unlock(sdata);
5086 }
5087
5088 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5089                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5090                                gfp_t gfp)
5091 {
5092         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5093
5094         trace_api_cqm_rssi_notify(sdata, rssi_event);
5095
5096         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5097 }
5098 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5099
5100 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5101 {
5102         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5103
5104         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5105
5106         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5107 }
5108 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);