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  * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/rtnetlink.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 #include "fils_aead.h"
  34
  35 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  36 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  37 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  38 #define IEEE80211_AUTH_MAX_TRIES        3
  39 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  40 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  41 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  42 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  43 #define IEEE80211_ASSOC_MAX_TRIES       3
  44
  45 static int max_nullfunc_tries = 2;
  46 module_param(max_nullfunc_tries, int, 0644);
  47 MODULE_PARM_DESC(max_nullfunc_tries,
  48                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  49
  50 static int max_probe_tries = 5;
  51 module_param(max_probe_tries, int, 0644);
  52 MODULE_PARM_DESC(max_probe_tries,
  53                  "Maximum probe tries before disconnecting (reason 4).");
  54
  55 /*
  56  * Beacon loss timeout is calculated as N frames times the
  57  * advertised beacon interval.  This may need to be somewhat
  58  * higher than what hardware might detect to account for
  59  * delays in the host processing frames. But since we also
  60  * probe on beacon miss before declaring the connection lost
  61  * default to what we want.
  62  */
  63 static int beacon_loss_count = 7;
  64 module_param(beacon_loss_count, int, 0644);
  65 MODULE_PARM_DESC(beacon_loss_count,
  66                  "Number of beacon intervals before we decide beacon was lost.");
  67
  68 /*
  69  * Time the connection can be idle before we probe
  70  * it to see if we can still talk to the AP.
  71  */
  72 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  73 /*
  74  * Time we wait for a probe response after sending
  75  * a probe request because of beacon loss or for
  76  * checking the connection still works.
  77  */
  78 static int probe_wait_ms = 500;
  79 module_param(probe_wait_ms, int, 0644);
  80 MODULE_PARM_DESC(probe_wait_ms,
  81                  "Maximum time(ms) to wait for probe response"
  82                  " before disconnecting (reason 4).");
  83
  84 /*
  85  * How many Beacon frames need to have been used in average signal strength
  86  * before starting to indicate signal change events.
  87  */
  88 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  89
  90 /*
  91  * We can have multiple work items (and connection probing)
  92  * scheduling this timer, but we need to take care to only
  93  * reschedule it when it should fire _earlier_ than it was
  94  * asked for before, or if it's not pending right now. This
  95  * function ensures that. Note that it then is required to
  96  * run this function for all timeouts after the first one
  97  * has happened -- the work that runs from this timer will
  98  * do that.
  99  */
 100 static void run_again(struct ieee80211_sub_if_data *sdata,
 101                       unsigned long timeout)
 102 {
 103         sdata_assert_lock(sdata);
 104
 105         if (!timer_pending(&sdata->u.mgd.timer) ||
 106             time_before(timeout, sdata->u.mgd.timer.expires))
 107                 mod_timer(&sdata->u.mgd.timer, timeout);
 108 }
 109
 110 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 111 {
 112         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 113                 return;
 114
 115         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 116                 return;
 117
 118         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 119                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 120 }
 121
 122 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 123 {
 124         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 125
 126         if (unlikely(!ifmgd->associated))
 127                 return;
 128
 129         if (ifmgd->probe_send_count)
 130                 ifmgd->probe_send_count = 0;
 131
 132         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 133                 return;
 134
 135         mod_timer(&ifmgd->conn_mon_timer,
 136                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 137 }
 138
 139 static int ecw2cw(int ecw)
 140 {
 141         return (1 << ecw) - 1;
 142 }
 143
 144 static u32
 145 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 146                              struct ieee80211_supported_band *sband,
 147                              struct ieee80211_channel *channel,
 148                              const struct ieee80211_ht_cap *ht_cap,
 149                              const struct ieee80211_ht_operation *ht_oper,
 150                              const struct ieee80211_vht_operation *vht_oper,
 151                              struct cfg80211_chan_def *chandef, bool tracking)
 152 {
 153         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 154         struct cfg80211_chan_def vht_chandef;
 155         struct ieee80211_sta_ht_cap sta_ht_cap;
 156         u32 ht_cfreq, ret;
 157
 158         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 159         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 160
 161         chandef->chan = channel;
 162         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 163         chandef->center_freq1 = channel->center_freq;
 164         chandef->center_freq2 = 0;
 165
 166         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 167                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 168                 goto out;
 169         }
 170
 171         chandef->width = NL80211_CHAN_WIDTH_20;
 172
 173         if (!(ht_cap->cap_info &
 174               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 175                 ret = IEEE80211_STA_DISABLE_40MHZ;
 176                 vht_chandef = *chandef;
 177                 goto out;
 178         }
 179
 180         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 181                                                   channel->band);
 182         /* check that channel matches the right operating channel */
 183         if (!tracking && channel->center_freq != ht_cfreq) {
 184                 /*
 185                  * It's possible that some APs are confused here;
 186                  * Netgear WNDR3700 sometimes reports 4 higher than
 187                  * the actual channel in association responses, but
 188                  * since we look at probe response/beacon data here
 189                  * it should be OK.
 190                  */
 191                 sdata_info(sdata,
 192                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 193                            channel->center_freq, ht_cfreq,
 194                            ht_oper->primary_chan, channel->band);
 195                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 196                 goto out;
 197         }
 198
 199         /* check 40 MHz support, if we have it */
 200         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 201                 ieee80211_chandef_ht_oper(ht_oper, chandef);
 202         } else {
 203                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 204                 ret = IEEE80211_STA_DISABLE_VHT;
 205                 /* also mark 40 MHz disabled */
 206                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 207                 goto out;
 208         }
 209
 210         if (!vht_oper || !sband->vht_cap.vht_supported) {
 211                 ret = IEEE80211_STA_DISABLE_VHT;
 212                 goto out;
 213         }
 214
 215         vht_chandef = *chandef;
 216         if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
 217                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 218                         sdata_info(sdata,
 219                                    "AP VHT information is invalid, disable VHT\n");
 220                 ret = IEEE80211_STA_DISABLE_VHT;
 221                 goto out;
 222         }
 223
 224         if (!cfg80211_chandef_valid(&vht_chandef)) {
 225                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 226                         sdata_info(sdata,
 227                                    "AP VHT information is invalid, disable VHT\n");
 228                 ret = IEEE80211_STA_DISABLE_VHT;
 229                 goto out;
 230         }
 231
 232         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 233                 ret = 0;
 234                 goto out;
 235         }
 236
 237         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 238                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 239                         sdata_info(sdata,
 240                                    "AP VHT information doesn't match HT, disable VHT\n");
 241                 ret = IEEE80211_STA_DISABLE_VHT;
 242                 goto out;
 243         }
 244
 245         *chandef = vht_chandef;
 246
 247         ret = 0;
 248
 249 out:
 250         /*
 251          * When tracking the current AP, don't do any further checks if the
 252          * new chandef is identical to the one we're currently using for the
 253          * connection. This keeps us from playing ping-pong with regulatory,
 254          * without it the following can happen (for example):
 255          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 256          *  - AP advertises regdom US
 257          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 258          *  - the code below detects an unsupported channel, downgrades, and
 259          *    we disconnect from the AP in the caller
 260          *  - disconnect causes CRDA to reload world regdomain and the game
 261          *    starts anew.
 262          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 263          *
 264          * It seems possible that there are still scenarios with CSA or real
 265          * bandwidth changes where a this could happen, but those cases are
 266          * less common and wouldn't completely prevent using the AP.
 267          */
 268         if (tracking &&
 269             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 270                 return ret;
 271
 272         /* don't print the message below for VHT mismatch if VHT is disabled */
 273         if (ret & IEEE80211_STA_DISABLE_VHT)
 274                 vht_chandef = *chandef;
 275
 276         /*
 277          * Ignore the DISABLED flag when we're already connected and only
 278          * tracking the APs beacon for bandwidth changes - otherwise we
 279          * might get disconnected here if we connect to an AP, update our
 280          * regulatory information based on the AP's country IE and the
 281          * information we have is wrong/outdated and disables the channel
 282          * that we're actually using for the connection to the AP.
 283          */
 284         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 285                                         tracking ? 0 :
 286                                                    IEEE80211_CHAN_DISABLED)) {
 287                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 288                         ret = IEEE80211_STA_DISABLE_HT |
 289                               IEEE80211_STA_DISABLE_VHT;
 290                         break;
 291                 }
 292
 293                 ret |= ieee80211_chandef_downgrade(chandef);
 294         }
 295
 296         if (chandef->width != vht_chandef.width && !tracking)
 297                 sdata_info(sdata,
 298                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 299
 300         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 301         return ret;
 302 }
 303
 304 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 305                                struct sta_info *sta,
 306                                const struct ieee80211_ht_cap *ht_cap,
 307                                const struct ieee80211_ht_operation *ht_oper,
 308                                const struct ieee80211_vht_operation *vht_oper,
 309                                const u8 *bssid, u32 *changed)
 310 {
 311         struct ieee80211_local *local = sdata->local;
 312         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 313         struct ieee80211_supported_band *sband;
 314         struct ieee80211_channel *chan;
 315         struct cfg80211_chan_def chandef;
 316         u16 ht_opmode;
 317         u32 flags;
 318         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 319         int ret;
 320
 321         /* if HT was/is disabled, don't track any bandwidth changes */
 322         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 323                 return 0;
 324
 325         /* don't check VHT if we associated as non-VHT station */
 326         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 327                 vht_oper = NULL;
 328
 329         if (WARN_ON_ONCE(!sta))
 330                 return -EINVAL;
 331
 332         /*
 333          * if bss configuration changed store the new one -
 334          * this may be applicable even if channel is identical
 335          */
 336         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 337         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 338                 *changed |= BSS_CHANGED_HT;
 339                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 340         }
 341
 342         chan = sdata->vif.bss_conf.chandef.chan;
 343         sband = local->hw.wiphy->bands[chan->band];
 344
 345         /* calculate new channel (type) based on HT/VHT operation IEs */
 346         flags = ieee80211_determine_chantype(sdata, sband, chan,
 347                                              ht_cap, ht_oper, vht_oper,
 348                                              &chandef, true);
 349
 350         /*
 351          * Downgrade the new channel if we associated with restricted
 352          * capabilities. For example, if we associated as a 20 MHz STA
 353          * to a 40 MHz AP (due to regulatory, capabilities or config
 354          * reasons) then switching to a 40 MHz channel now won't do us
 355          * any good -- we couldn't use it with the AP.
 356          */
 357         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 358             chandef.width == NL80211_CHAN_WIDTH_80P80)
 359                 flags |= ieee80211_chandef_downgrade(&chandef);
 360         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 361             chandef.width == NL80211_CHAN_WIDTH_160)
 362                 flags |= ieee80211_chandef_downgrade(&chandef);
 363         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 364             chandef.width > NL80211_CHAN_WIDTH_20)
 365                 flags |= ieee80211_chandef_downgrade(&chandef);
 366
 367         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 368                 return 0;
 369
 370         sdata_info(sdata,
 371                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 372                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 373                    chandef.center_freq1, chandef.center_freq2);
 374
 375         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 376                                       IEEE80211_STA_DISABLE_VHT |
 377                                       IEEE80211_STA_DISABLE_40MHZ |
 378                                       IEEE80211_STA_DISABLE_80P80MHZ |
 379                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 380             !cfg80211_chandef_valid(&chandef)) {
 381                 sdata_info(sdata,
 382                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 383                            ifmgd->bssid);
 384                 return -EINVAL;
 385         }
 386
 387         switch (chandef.width) {
 388         case NL80211_CHAN_WIDTH_20_NOHT:
 389         case NL80211_CHAN_WIDTH_20:
 390                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 391                 break;
 392         case NL80211_CHAN_WIDTH_40:
 393                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 394                 break;
 395         case NL80211_CHAN_WIDTH_80:
 396                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 397                 break;
 398         case NL80211_CHAN_WIDTH_80P80:
 399         case NL80211_CHAN_WIDTH_160:
 400                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 401                 break;
 402         default:
 403                 return -EINVAL;
 404         }
 405
 406         if (new_sta_bw > sta->cur_max_bandwidth)
 407                 new_sta_bw = sta->cur_max_bandwidth;
 408
 409         if (new_sta_bw < sta->sta.bandwidth) {
 410                 sta->sta.bandwidth = new_sta_bw;
 411                 rate_control_rate_update(local, sband, sta,
 412                                          IEEE80211_RC_BW_CHANGED);
 413         }
 414
 415         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 416         if (ret) {
 417                 sdata_info(sdata,
 418                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 419                            ifmgd->bssid);
 420                 return ret;
 421         }
 422
 423         if (new_sta_bw > sta->sta.bandwidth) {
 424                 sta->sta.bandwidth = new_sta_bw;
 425                 rate_control_rate_update(local, sband, sta,
 426                                          IEEE80211_RC_BW_CHANGED);
 427         }
 428
 429         return 0;
 430 }
 431
 432 /* frame sending functions */
 433
 434 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 435                                 struct sk_buff *skb, u8 ap_ht_param,
 436                                 struct ieee80211_supported_band *sband,
 437                                 struct ieee80211_channel *channel,
 438                                 enum ieee80211_smps_mode smps)
 439 {
 440         u8 *pos;
 441         u32 flags = channel->flags;
 442         u16 cap;
 443         struct ieee80211_sta_ht_cap ht_cap;
 444
 445         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 446
 447         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 448         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 449
 450         /* determine capability flags */
 451         cap = ht_cap.cap;
 452
 453         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 454         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 455                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 456                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 457                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 458                 }
 459                 break;
 460         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 461                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 462                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 463                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 464                 }
 465                 break;
 466         }
 467
 468         /*
 469          * If 40 MHz was disabled associate as though we weren't
 470          * capable of 40 MHz -- some broken APs will never fall
 471          * back to trying to transmit in 20 MHz.
 472          */
 473         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 474                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 475                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 476         }
 477
 478         /* set SM PS mode properly */
 479         cap &= ~IEEE80211_HT_CAP_SM_PS;
 480         switch (smps) {
 481         case IEEE80211_SMPS_AUTOMATIC:
 482         case IEEE80211_SMPS_NUM_MODES:
 483                 WARN_ON(1);
 484         case IEEE80211_SMPS_OFF:
 485                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 486                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 487                 break;
 488         case IEEE80211_SMPS_STATIC:
 489                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 490                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 491                 break;
 492         case IEEE80211_SMPS_DYNAMIC:
 493                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 494                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 495                 break;
 496         }
 497
 498         /* reserve and fill IE */
 499         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 500         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 501 }
 502
 503 /* This function determines vht capability flags for the association
 504  * and builds the IE.
 505  * Note - the function may set the owner of the MU-MIMO capability
 506  */
 507 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 508                                  struct sk_buff *skb,
 509                                  struct ieee80211_supported_band *sband,
 510                                  struct ieee80211_vht_cap *ap_vht_cap)
 511 {
 512         struct ieee80211_local *local = sdata->local;
 513         u8 *pos;
 514         u32 cap;
 515         struct ieee80211_sta_vht_cap vht_cap;
 516         u32 mask, ap_bf_sts, our_bf_sts;
 517
 518         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 519
 520         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 521         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 522
 523         /* determine capability flags */
 524         cap = vht_cap.cap;
 525
 526         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 527                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 528
 529                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 530                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 531                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 532                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 533         }
 534
 535         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 536                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 537                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 538         }
 539
 540         /*
 541          * Some APs apparently get confused if our capabilities are better
 542          * than theirs, so restrict what we advertise in the assoc request.
 543          */
 544         if (!(ap_vht_cap->vht_cap_info &
 545                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 546                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 547                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 548         else if (!(ap_vht_cap->vht_cap_info &
 549                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 550                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 551
 552         /*
 553          * If some other vif is using the MU-MIMO capablity we cannot associate
 554          * using MU-MIMO - this will lead to contradictions in the group-id
 555          * mechanism.
 556          * Ownership is defined since association request, in order to avoid
 557          * simultaneous associations with MU-MIMO.
 558          */
 559         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 560                 bool disable_mu_mimo = false;
 561                 struct ieee80211_sub_if_data *other;
 562
 563                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 564                         if (other->vif.mu_mimo_owner) {
 565                                 disable_mu_mimo = true;
 566                                 break;
 567                         }
 568                 }
 569                 if (disable_mu_mimo)
 570                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 571                 else
 572                         sdata->vif.mu_mimo_owner = true;
 573         }
 574
 575         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 576
 577         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 578         our_bf_sts = cap & mask;
 579
 580         if (ap_bf_sts < our_bf_sts) {
 581                 cap &= ~mask;
 582                 cap |= ap_bf_sts;
 583         }
 584
 585         /* reserve and fill IE */
 586         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 587         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 588 }
 589
 590 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 591 {
 592         struct ieee80211_local *local = sdata->local;
 593         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 594         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 595         struct sk_buff *skb;
 596         struct ieee80211_mgmt *mgmt;
 597         u8 *pos, qos_info;
 598         size_t offset = 0, noffset;
 599         int i, count, rates_len, supp_rates_len, shift;
 600         u16 capab;
 601         struct ieee80211_supported_band *sband;
 602         struct ieee80211_chanctx_conf *chanctx_conf;
 603         struct ieee80211_channel *chan;
 604         u32 rate_flags, rates = 0;
 605
 606         sdata_assert_lock(sdata);
 607
 608         rcu_read_lock();
 609         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 610         if (WARN_ON(!chanctx_conf)) {
 611                 rcu_read_unlock();
 612                 return;
 613         }
 614         chan = chanctx_conf->def.chan;
 615         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 616         rcu_read_unlock();
 617         sband = local->hw.wiphy->bands[chan->band];
 618         shift = ieee80211_vif_get_shift(&sdata->vif);
 619
 620         if (assoc_data->supp_rates_len) {
 621                 /*
 622                  * Get all rates supported by the device and the AP as
 623                  * some APs don't like getting a superset of their rates
 624                  * in the association request (e.g. D-Link DAP 1353 in
 625                  * b-only mode)...
 626                  */
 627                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 628                                                      assoc_data->supp_rates,
 629                                                      assoc_data->supp_rates_len,
 630                                                      &rates);
 631         } else {
 632                 /*
 633                  * In case AP not provide any supported rates information
 634                  * before association, we send information element(s) with
 635                  * all rates that we support.
 636                  */
 637                 rates_len = 0;
 638                 for (i = 0; i < sband->n_bitrates; i++) {
 639                         if ((rate_flags & sband->bitrates[i].flags)
 640                             != rate_flags)
 641                                 continue;
 642                         rates |= BIT(i);
 643                         rates_len++;
 644                 }
 645         }
 646
 647         skb = alloc_skb(local->hw.extra_tx_headroom +
 648                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 649                         2 + assoc_data->ssid_len + /* SSID */
 650                         4 + rates_len + /* (extended) rates */
 651                         4 + /* power capability */
 652                         2 + 2 * sband->n_channels + /* supported channels */
 653                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 654                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 655                         assoc_data->ie_len + /* extra IEs */
 656                         (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
 657                         9, /* WMM */
 658                         GFP_KERNEL);
 659         if (!skb)
 660                 return;
 661
 662         skb_reserve(skb, local->hw.extra_tx_headroom);
 663
 664         capab = WLAN_CAPABILITY_ESS;
 665
 666         if (sband->band == NL80211_BAND_2GHZ) {
 667                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 668                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 669         }
 670
 671         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 672                 capab |= WLAN_CAPABILITY_PRIVACY;
 673
 674         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 675             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 676                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 677
 678         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 679                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 680
 681         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 682         memset(mgmt, 0, 24);
 683         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 684         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 685         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 686
 687         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 688                 skb_put(skb, 10);
 689                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 690                                                   IEEE80211_STYPE_REASSOC_REQ);
 691                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 692                 mgmt->u.reassoc_req.listen_interval =
 693                                 cpu_to_le16(local->hw.conf.listen_interval);
 694                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 695                        ETH_ALEN);
 696         } else {
 697                 skb_put(skb, 4);
 698                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 699                                                   IEEE80211_STYPE_ASSOC_REQ);
 700                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 701                 mgmt->u.assoc_req.listen_interval =
 702                                 cpu_to_le16(local->hw.conf.listen_interval);
 703         }
 704
 705         /* SSID */
 706         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 707         *pos++ = WLAN_EID_SSID;
 708         *pos++ = assoc_data->ssid_len;
 709         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 710
 711         /* add all rates which were marked to be used above */
 712         supp_rates_len = rates_len;
 713         if (supp_rates_len > 8)
 714                 supp_rates_len = 8;
 715
 716         pos = skb_put(skb, supp_rates_len + 2);
 717         *pos++ = WLAN_EID_SUPP_RATES;
 718         *pos++ = supp_rates_len;
 719
 720         count = 0;
 721         for (i = 0; i < sband->n_bitrates; i++) {
 722                 if (BIT(i) & rates) {
 723                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 724                                                 5 * (1 << shift));
 725                         *pos++ = (u8) rate;
 726                         if (++count == 8)
 727                                 break;
 728                 }
 729         }
 730
 731         if (rates_len > count) {
 732                 pos = skb_put(skb, rates_len - count + 2);
 733                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 734                 *pos++ = rates_len - count;
 735
 736                 for (i++; i < sband->n_bitrates; i++) {
 737                         if (BIT(i) & rates) {
 738                                 int rate;
 739                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 740                                                     5 * (1 << shift));
 741                                 *pos++ = (u8) rate;
 742                         }
 743                 }
 744         }
 745
 746         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 747             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 748                 pos = skb_put(skb, 4);
 749                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 750                 *pos++ = 2;
 751                 *pos++ = 0; /* min tx power */
 752                  /* max tx power */
 753                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 754         }
 755
 756         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 757                 /* TODO: get this in reg domain format */
 758                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 759                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 760                 *pos++ = 2 * sband->n_channels;
 761                 for (i = 0; i < sband->n_channels; i++) {
 762                         *pos++ = ieee80211_frequency_to_channel(
 763                                         sband->channels[i].center_freq);
 764                         *pos++ = 1; /* one channel in the subband*/
 765                 }
 766         }
 767
 768         /* if present, add any custom IEs that go before HT */
 769         if (assoc_data->ie_len) {
 770                 static const u8 before_ht[] = {
 771                         WLAN_EID_SSID,
 772                         WLAN_EID_SUPP_RATES,
 773                         WLAN_EID_EXT_SUPP_RATES,
 774                         WLAN_EID_PWR_CAPABILITY,
 775                         WLAN_EID_SUPPORTED_CHANNELS,
 776                         WLAN_EID_RSN,
 777                         WLAN_EID_QOS_CAPA,
 778                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 779                         WLAN_EID_MOBILITY_DOMAIN,
 780                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 781                         WLAN_EID_RIC_DATA,              /* reassoc only */
 782                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 783                 };
 784                 static const u8 after_ric[] = {
 785                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 786                         WLAN_EID_HT_CAPABILITY,
 787                         WLAN_EID_BSS_COEX_2040,
 788                         WLAN_EID_EXT_CAPABILITY,
 789                         WLAN_EID_QOS_TRAFFIC_CAPA,
 790                         WLAN_EID_TIM_BCAST_REQ,
 791                         WLAN_EID_INTERWORKING,
 792                         /* 60GHz doesn't happen right now */
 793                         WLAN_EID_VHT_CAPABILITY,
 794                         WLAN_EID_OPMODE_NOTIF,
 795                 };
 796
 797                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 798                                                  assoc_data->ie_len,
 799                                                  before_ht,
 800                                                  ARRAY_SIZE(before_ht),
 801                                                  after_ric,
 802                                                  ARRAY_SIZE(after_ric),
 803                                                  offset);
 804                 pos = skb_put(skb, noffset - offset);
 805                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 806                 offset = noffset;
 807         }
 808
 809         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 810                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 811                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 812
 813         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 814                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 815                                     sband, chan, sdata->smps_mode);
 816
 817         /* if present, add any custom IEs that go before VHT */
 818         if (assoc_data->ie_len) {
 819                 static const u8 before_vht[] = {
 820                         WLAN_EID_SSID,
 821                         WLAN_EID_SUPP_RATES,
 822                         WLAN_EID_EXT_SUPP_RATES,
 823                         WLAN_EID_PWR_CAPABILITY,
 824                         WLAN_EID_SUPPORTED_CHANNELS,
 825                         WLAN_EID_RSN,
 826                         WLAN_EID_QOS_CAPA,
 827                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 828                         WLAN_EID_MOBILITY_DOMAIN,
 829                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 830                         WLAN_EID_HT_CAPABILITY,
 831                         WLAN_EID_BSS_COEX_2040,
 832                         WLAN_EID_EXT_CAPABILITY,
 833                         WLAN_EID_QOS_TRAFFIC_CAPA,
 834                         WLAN_EID_TIM_BCAST_REQ,
 835                         WLAN_EID_INTERWORKING,
 836                 };
 837
 838                 /* RIC already taken above, so no need to handle here anymore */
 839                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 840                                              before_vht, ARRAY_SIZE(before_vht),
 841                                              offset);
 842                 pos = skb_put(skb, noffset - offset);
 843                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 844                 offset = noffset;
 845         }
 846
 847         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 848                 ieee80211_add_vht_ie(sdata, skb, sband,
 849                                      &assoc_data->ap_vht_cap);
 850
 851         /* if present, add any custom non-vendor IEs that go after HT */
 852         if (assoc_data->ie_len) {
 853                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 854                                                     assoc_data->ie_len,
 855                                                     offset);
 856                 pos = skb_put(skb, noffset - offset);
 857                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 858                 offset = noffset;
 859         }
 860
 861         if (assoc_data->wmm) {
 862                 if (assoc_data->uapsd) {
 863                         qos_info = ifmgd->uapsd_queues;
 864                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 865                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 866                 } else {
 867                         qos_info = 0;
 868                 }
 869
 870                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 871         }
 872
 873         /* add any remaining custom (i.e. vendor specific here) IEs */
 874         if (assoc_data->ie_len) {
 875                 noffset = assoc_data->ie_len;
 876                 pos = skb_put(skb, noffset - offset);
 877                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 878         }
 879
 880         if (assoc_data->fils_kek_len &&
 881             fils_encrypt_assoc_req(skb, assoc_data) < 0) {
 882                 dev_kfree_skb(skb);
 883                 return;
 884         }
 885
 886         drv_mgd_prepare_tx(local, sdata);
 887
 888         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 889         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 890                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 891                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 892         ieee80211_tx_skb(sdata, skb);
 893 }
 894
 895 void ieee80211_send_pspoll(struct ieee80211_local *local,
 896                            struct ieee80211_sub_if_data *sdata)
 897 {
 898         struct ieee80211_pspoll *pspoll;
 899         struct sk_buff *skb;
 900
 901         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 902         if (!skb)
 903                 return;
 904
 905         pspoll = (struct ieee80211_pspoll *) skb->data;
 906         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 907
 908         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 909         ieee80211_tx_skb(sdata, skb);
 910 }
 911
 912 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 913                              struct ieee80211_sub_if_data *sdata,
 914                              bool powersave)
 915 {
 916         struct sk_buff *skb;
 917         struct ieee80211_hdr_3addr *nullfunc;
 918         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 919
 920         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 921         if (!skb)
 922                 return;
 923
 924         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 925         if (powersave)
 926                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 927
 928         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 929                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 930
 931         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 932                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 933
 934         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 935                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 936
 937         ieee80211_tx_skb(sdata, skb);
 938 }
 939
 940 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 941                                           struct ieee80211_sub_if_data *sdata)
 942 {
 943         struct sk_buff *skb;
 944         struct ieee80211_hdr *nullfunc;
 945         __le16 fc;
 946
 947         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 948                 return;
 949
 950         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 951         if (!skb)
 952                 return;
 953
 954         skb_reserve(skb, local->hw.extra_tx_headroom);
 955
 956         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 957         memset(nullfunc, 0, 30);
 958         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 959                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 960         nullfunc->frame_control = fc;
 961         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 962         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 963         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 964         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 965
 966         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 967         ieee80211_tx_skb(sdata, skb);
 968 }
 969
 970 /* spectrum management related things */
 971 static void ieee80211_chswitch_work(struct work_struct *work)
 972 {
 973         struct ieee80211_sub_if_data *sdata =
 974                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 975         struct ieee80211_local *local = sdata->local;
 976         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 977         int ret;
 978
 979         if (!ieee80211_sdata_running(sdata))
 980                 return;
 981
 982         sdata_lock(sdata);
 983         mutex_lock(&local->mtx);
 984         mutex_lock(&local->chanctx_mtx);
 985
 986         if (!ifmgd->associated)
 987                 goto out;
 988
 989         if (!sdata->vif.csa_active)
 990                 goto out;
 991
 992         /*
 993          * using reservation isn't immediate as it may be deferred until later
 994          * with multi-vif. once reservation is complete it will re-schedule the
 995          * work with no reserved_chanctx so verify chandef to check if it
 996          * completed successfully
 997          */
 998
 999         if (sdata->reserved_chanctx) {
1000                 /*
1001                  * with multi-vif csa driver may call ieee80211_csa_finish()
1002                  * many times while waiting for other interfaces to use their
1003                  * reservations
1004                  */
1005                 if (sdata->reserved_ready)
1006                         goto out;
1007
1008                 ret = ieee80211_vif_use_reserved_context(sdata);
1009                 if (ret) {
1010                         sdata_info(sdata,
1011                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1012                                    ret);
1013                         ieee80211_queue_work(&sdata->local->hw,
1014                                              &ifmgd->csa_connection_drop_work);
1015                         goto out;
1016                 }
1017
1018                 goto out;
1019         }
1020
1021         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1022                                         &sdata->csa_chandef)) {
1023                 sdata_info(sdata,
1024                            "failed to finalize channel switch, disconnecting\n");
1025                 ieee80211_queue_work(&sdata->local->hw,
1026                                      &ifmgd->csa_connection_drop_work);
1027                 goto out;
1028         }
1029
1030         /* XXX: shouldn't really modify cfg80211-owned data! */
1031         ifmgd->associated->channel = sdata->csa_chandef.chan;
1032
1033         ifmgd->csa_waiting_bcn = true;
1034
1035         ieee80211_sta_reset_beacon_monitor(sdata);
1036         ieee80211_sta_reset_conn_monitor(sdata);
1037
1038 out:
1039         mutex_unlock(&local->chanctx_mtx);
1040         mutex_unlock(&local->mtx);
1041         sdata_unlock(sdata);
1042 }
1043
1044 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1045 {
1046         struct ieee80211_local *local = sdata->local;
1047         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1048         int ret;
1049
1050         sdata_assert_lock(sdata);
1051
1052         WARN_ON(!sdata->vif.csa_active);
1053
1054         if (sdata->csa_block_tx) {
1055                 ieee80211_wake_vif_queues(local, sdata,
1056                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1057                 sdata->csa_block_tx = false;
1058         }
1059
1060         sdata->vif.csa_active = false;
1061         ifmgd->csa_waiting_bcn = false;
1062
1063         ret = drv_post_channel_switch(sdata);
1064         if (ret) {
1065                 sdata_info(sdata,
1066                            "driver post channel switch failed, disconnecting\n");
1067                 ieee80211_queue_work(&local->hw,
1068                                      &ifmgd->csa_connection_drop_work);
1069                 return;
1070         }
1071
1072         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1073 }
1074
1075 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1076 {
1077         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1078         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1079
1080         trace_api_chswitch_done(sdata, success);
1081         if (!success) {
1082                 sdata_info(sdata,
1083                            "driver channel switch failed, disconnecting\n");
1084                 ieee80211_queue_work(&sdata->local->hw,
1085                                      &ifmgd->csa_connection_drop_work);
1086         } else {
1087                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1088         }
1089 }
1090 EXPORT_SYMBOL(ieee80211_chswitch_done);
1091
1092 static void ieee80211_chswitch_timer(unsigned long data)
1093 {
1094         struct ieee80211_sub_if_data *sdata =
1095                 (struct ieee80211_sub_if_data *) data;
1096
1097         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1098 }
1099
1100 static void
1101 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1102                                  u64 timestamp, u32 device_timestamp,
1103                                  struct ieee802_11_elems *elems,
1104                                  bool beacon)
1105 {
1106         struct ieee80211_local *local = sdata->local;
1107         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1108         struct cfg80211_bss *cbss = ifmgd->associated;
1109         struct ieee80211_chanctx_conf *conf;
1110         struct ieee80211_chanctx *chanctx;
1111         enum nl80211_band current_band;
1112         struct ieee80211_csa_ie csa_ie;
1113         struct ieee80211_channel_switch ch_switch;
1114         int res;
1115
1116         sdata_assert_lock(sdata);
1117
1118         if (!cbss)
1119                 return;
1120
1121         if (local->scanning)
1122                 return;
1123
1124         /* disregard subsequent announcements if we are already processing */
1125         if (sdata->vif.csa_active)
1126                 return;
1127
1128         current_band = cbss->channel->band;
1129         memset(&csa_ie, 0, sizeof(csa_ie));
1130         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1131                                            ifmgd->flags,
1132                                            ifmgd->associated->bssid, &csa_ie);
1133         if (res < 0)
1134                 ieee80211_queue_work(&local->hw,
1135                                      &ifmgd->csa_connection_drop_work);
1136         if (res)
1137                 return;
1138
1139         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1140                                      IEEE80211_CHAN_DISABLED)) {
1141                 sdata_info(sdata,
1142                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1143                            ifmgd->associated->bssid,
1144                            csa_ie.chandef.chan->center_freq,
1145                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1146                            csa_ie.chandef.center_freq2);
1147                 ieee80211_queue_work(&local->hw,
1148                                      &ifmgd->csa_connection_drop_work);
1149                 return;
1150         }
1151
1152         if (cfg80211_chandef_identical(&csa_ie.chandef,
1153                                        &sdata->vif.bss_conf.chandef)) {
1154                 if (ifmgd->csa_ignored_same_chan)
1155                         return;
1156                 sdata_info(sdata,
1157                            "AP %pM tries to chanswitch to same channel, ignore\n",
1158                            ifmgd->associated->bssid);
1159                 ifmgd->csa_ignored_same_chan = true;
1160                 return;
1161         }
1162
1163         /*
1164          * Drop all TDLS peers - either we disconnect or move to a different
1165          * channel from this point on. There's no telling what our peer will do.
1166          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1167          * have an incompatible wider chandef.
1168          */
1169         ieee80211_teardown_tdls_peers(sdata);
1170
1171         mutex_lock(&local->mtx);
1172         mutex_lock(&local->chanctx_mtx);
1173         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1174                                          lockdep_is_held(&local->chanctx_mtx));
1175         if (!conf) {
1176                 sdata_info(sdata,
1177                            "no channel context assigned to vif?, disconnecting\n");
1178                 goto drop_connection;
1179         }
1180
1181         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1182
1183         if (local->use_chanctx &&
1184             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1185                 sdata_info(sdata,
1186                            "driver doesn't support chan-switch with channel contexts\n");
1187                 goto drop_connection;
1188         }
1189
1190         ch_switch.timestamp = timestamp;
1191         ch_switch.device_timestamp = device_timestamp;
1192         ch_switch.block_tx = csa_ie.mode;
1193         ch_switch.chandef = csa_ie.chandef;
1194         ch_switch.count = csa_ie.count;
1195
1196         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1197                 sdata_info(sdata,
1198                            "preparing for channel switch failed, disconnecting\n");
1199                 goto drop_connection;
1200         }
1201
1202         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1203                                             chanctx->mode, false);
1204         if (res) {
1205                 sdata_info(sdata,
1206                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1207                            res);
1208                 goto drop_connection;
1209         }
1210         mutex_unlock(&local->chanctx_mtx);
1211
1212         sdata->vif.csa_active = true;
1213         sdata->csa_chandef = csa_ie.chandef;
1214         sdata->csa_block_tx = csa_ie.mode;
1215         ifmgd->csa_ignored_same_chan = false;
1216
1217         if (sdata->csa_block_tx)
1218                 ieee80211_stop_vif_queues(local, sdata,
1219                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1220         mutex_unlock(&local->mtx);
1221
1222         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1223                                           csa_ie.count);
1224
1225         if (local->ops->channel_switch) {
1226                 /* use driver's channel switch callback */
1227                 drv_channel_switch(local, sdata, &ch_switch);
1228                 return;
1229         }
1230
1231         /* channel switch handled in software */
1232         if (csa_ie.count <= 1)
1233                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1234         else
1235                 mod_timer(&ifmgd->chswitch_timer,
1236                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1237                                          cbss->beacon_interval));
1238         return;
1239  drop_connection:
1240         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1241         mutex_unlock(&local->chanctx_mtx);
1242         mutex_unlock(&local->mtx);
1243 }
1244
1245 static bool
1246 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1247                                  struct ieee80211_channel *channel,
1248                                  const u8 *country_ie, u8 country_ie_len,
1249                                  const u8 *pwr_constr_elem,
1250                                  int *chan_pwr, int *pwr_reduction)
1251 {
1252         struct ieee80211_country_ie_triplet *triplet;
1253         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1254         int i, chan_increment;
1255         bool have_chan_pwr = false;
1256
1257         /* Invalid IE */
1258         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1259                 return false;
1260
1261         triplet = (void *)(country_ie + 3);
1262         country_ie_len -= 3;
1263
1264         switch (channel->band) {
1265         default:
1266                 WARN_ON_ONCE(1);
1267                 /* fall through */
1268         case NL80211_BAND_2GHZ:
1269         case NL80211_BAND_60GHZ:
1270                 chan_increment = 1;
1271                 break;
1272         case NL80211_BAND_5GHZ:
1273                 chan_increment = 4;
1274                 break;
1275         }
1276
1277         /* find channel */
1278         while (country_ie_len >= 3) {
1279                 u8 first_channel = triplet->chans.first_channel;
1280
1281                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1282                         goto next;
1283
1284                 for (i = 0; i < triplet->chans.num_channels; i++) {
1285                         if (first_channel + i * chan_increment == chan) {
1286                                 have_chan_pwr = true;
1287                                 *chan_pwr = triplet->chans.max_power;
1288                                 break;
1289                         }
1290                 }
1291                 if (have_chan_pwr)
1292                         break;
1293
1294  next:
1295                 triplet++;
1296                 country_ie_len -= 3;
1297         }
1298
1299         if (have_chan_pwr && pwr_constr_elem)
1300                 *pwr_reduction = *pwr_constr_elem;
1301         else
1302                 *pwr_reduction = 0;
1303
1304         return have_chan_pwr;
1305 }
1306
1307 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1308                                       struct ieee80211_channel *channel,
1309                                       const u8 *cisco_dtpc_ie,
1310                                       int *pwr_level)
1311 {
1312         /* From practical testing, the first data byte of the DTPC element
1313          * seems to contain the requested dBm level, and the CLI on Cisco
1314          * APs clearly state the range is -127 to 127 dBm, which indicates
1315          * a signed byte, although it seemingly never actually goes negative.
1316          * The other byte seems to always be zero.
1317          */
1318         *pwr_level = (__s8)cisco_dtpc_ie[4];
1319 }
1320
1321 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1322                                        struct ieee80211_channel *channel,
1323                                        struct ieee80211_mgmt *mgmt,
1324                                        const u8 *country_ie, u8 country_ie_len,
1325                                        const u8 *pwr_constr_ie,
1326                                        const u8 *cisco_dtpc_ie)
1327 {
1328         bool has_80211h_pwr = false, has_cisco_pwr = false;
1329         int chan_pwr = 0, pwr_reduction_80211h = 0;
1330         int pwr_level_cisco, pwr_level_80211h;
1331         int new_ap_level;
1332         __le16 capab = mgmt->u.probe_resp.capab_info;
1333
1334         if (country_ie &&
1335             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1336              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1337                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1338                         sdata, channel, country_ie, country_ie_len,
1339                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1340                 pwr_level_80211h =
1341                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1342         }
1343
1344         if (cisco_dtpc_ie) {
1345                 ieee80211_find_cisco_dtpc(
1346                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1347                 has_cisco_pwr = true;
1348         }
1349
1350         if (!has_80211h_pwr && !has_cisco_pwr)
1351                 return 0;
1352
1353         /* If we have both 802.11h and Cisco DTPC, apply both limits
1354          * by picking the smallest of the two power levels advertised.
1355          */
1356         if (has_80211h_pwr &&
1357             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1358                 new_ap_level = pwr_level_80211h;
1359
1360                 if (sdata->ap_power_level == new_ap_level)
1361                         return 0;
1362
1363                 sdata_dbg(sdata,
1364                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1365                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1366                           sdata->u.mgd.bssid);
1367         } else {  /* has_cisco_pwr is always true here. */
1368                 new_ap_level = pwr_level_cisco;
1369
1370                 if (sdata->ap_power_level == new_ap_level)
1371                         return 0;
1372
1373                 sdata_dbg(sdata,
1374                           "Limiting TX power to %d dBm as advertised by %pM\n",
1375                           pwr_level_cisco, sdata->u.mgd.bssid);
1376         }
1377
1378         sdata->ap_power_level = new_ap_level;
1379         if (__ieee80211_recalc_txpower(sdata))
1380                 return BSS_CHANGED_TXPOWER;
1381         return 0;
1382 }
1383
1384 /* powersave */
1385 static void ieee80211_enable_ps(struct ieee80211_local *local,
1386                                 struct ieee80211_sub_if_data *sdata)
1387 {
1388         struct ieee80211_conf *conf = &local->hw.conf;
1389
1390         /*
1391          * If we are scanning right now then the parameters will
1392          * take effect when scan finishes.
1393          */
1394         if (local->scanning)
1395                 return;
1396
1397         if (conf->dynamic_ps_timeout > 0 &&
1398             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1399                 mod_timer(&local->dynamic_ps_timer, jiffies +
1400                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1401         } else {
1402                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1403                         ieee80211_send_nullfunc(local, sdata, true);
1404
1405                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1406                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1407                         return;
1408
1409                 conf->flags |= IEEE80211_CONF_PS;
1410                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1411         }
1412 }
1413
1414 static void ieee80211_change_ps(struct ieee80211_local *local)
1415 {
1416         struct ieee80211_conf *conf = &local->hw.conf;
1417
1418         if (local->ps_sdata) {
1419                 ieee80211_enable_ps(local, local->ps_sdata);
1420         } else if (conf->flags & IEEE80211_CONF_PS) {
1421                 conf->flags &= ~IEEE80211_CONF_PS;
1422                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1423                 del_timer_sync(&local->dynamic_ps_timer);
1424                 cancel_work_sync(&local->dynamic_ps_enable_work);
1425         }
1426 }
1427
1428 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1429 {
1430         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1431         struct sta_info *sta = NULL;
1432         bool authorized = false;
1433
1434         if (!mgd->powersave)
1435                 return false;
1436
1437         if (mgd->broken_ap)
1438                 return false;
1439
1440         if (!mgd->associated)
1441                 return false;
1442
1443         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1444                 return false;
1445
1446         if (!mgd->have_beacon)
1447                 return false;
1448
1449         rcu_read_lock();
1450         sta = sta_info_get(sdata, mgd->bssid);
1451         if (sta)
1452                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1453         rcu_read_unlock();
1454
1455         return authorized;
1456 }
1457
1458 /* need to hold RTNL or interface lock */
1459 void ieee80211_recalc_ps(struct ieee80211_local *local)
1460 {
1461         struct ieee80211_sub_if_data *sdata, *found = NULL;
1462         int count = 0;
1463         int timeout;
1464
1465         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1466                 local->ps_sdata = NULL;
1467                 return;
1468         }
1469
1470         list_for_each_entry(sdata, &local->interfaces, list) {
1471                 if (!ieee80211_sdata_running(sdata))
1472                         continue;
1473                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1474                         /* If an AP vif is found, then disable PS
1475                          * by setting the count to zero thereby setting
1476                          * ps_sdata to NULL.
1477                          */
1478                         count = 0;
1479                         break;
1480                 }
1481                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1482                         continue;
1483                 found = sdata;
1484                 count++;
1485         }
1486
1487         if (count == 1 && ieee80211_powersave_allowed(found)) {
1488                 u8 dtimper = found->u.mgd.dtim_period;
1489
1490                 timeout = local->dynamic_ps_forced_timeout;
1491                 if (timeout < 0)
1492                         timeout = 100;
1493                 local->hw.conf.dynamic_ps_timeout = timeout;
1494
1495                 /* If the TIM IE is invalid, pretend the value is 1 */
1496                 if (!dtimper)
1497                         dtimper = 1;
1498
1499                 local->hw.conf.ps_dtim_period = dtimper;
1500                 local->ps_sdata = found;
1501         } else {
1502                 local->ps_sdata = NULL;
1503         }
1504
1505         ieee80211_change_ps(local);
1506 }
1507
1508 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1509 {
1510         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1511
1512         if (sdata->vif.bss_conf.ps != ps_allowed) {
1513                 sdata->vif.bss_conf.ps = ps_allowed;
1514                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1515         }
1516 }
1517
1518 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1519 {
1520         struct ieee80211_local *local =
1521                 container_of(work, struct ieee80211_local,
1522                              dynamic_ps_disable_work);
1523
1524         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1525                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1526                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1527         }
1528
1529         ieee80211_wake_queues_by_reason(&local->hw,
1530                                         IEEE80211_MAX_QUEUE_MAP,
1531                                         IEEE80211_QUEUE_STOP_REASON_PS,
1532                                         false);
1533 }
1534
1535 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1536 {
1537         struct ieee80211_local *local =
1538                 container_of(work, struct ieee80211_local,
1539                              dynamic_ps_enable_work);
1540         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1541         struct ieee80211_if_managed *ifmgd;
1542         unsigned long flags;
1543         int q;
1544
1545         /* can only happen when PS was just disabled anyway */
1546         if (!sdata)
1547                 return;
1548
1549         ifmgd = &sdata->u.mgd;
1550
1551         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1552                 return;
1553
1554         if (local->hw.conf.dynamic_ps_timeout > 0) {
1555                 /* don't enter PS if TX frames are pending */
1556                 if (drv_tx_frames_pending(local)) {
1557                         mod_timer(&local->dynamic_ps_timer, jiffies +
1558                                   msecs_to_jiffies(
1559                                   local->hw.conf.dynamic_ps_timeout));
1560                         return;
1561                 }
1562
1563                 /*
1564                  * transmission can be stopped by others which leads to
1565                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1566                  * is not the actual idle state.
1567                  */
1568                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1569                 for (q = 0; q < local->hw.queues; q++) {
1570                         if (local->queue_stop_reasons[q]) {
1571                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1572                                                        flags);
1573                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1574                                           msecs_to_jiffies(
1575                                           local->hw.conf.dynamic_ps_timeout));
1576                                 return;
1577                         }
1578                 }
1579                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1580         }
1581
1582         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1583             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1584                 if (drv_tx_frames_pending(local)) {
1585                         mod_timer(&local->dynamic_ps_timer, jiffies +
1586                                   msecs_to_jiffies(
1587                                   local->hw.conf.dynamic_ps_timeout));
1588                 } else {
1589                         ieee80211_send_nullfunc(local, sdata, true);
1590                         /* Flush to get the tx status of nullfunc frame */
1591                         ieee80211_flush_queues(local, sdata, false);
1592                 }
1593         }
1594
1595         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1596               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1597             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1598                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1599                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1600                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1601         }
1602 }
1603
1604 void ieee80211_dynamic_ps_timer(unsigned long data)
1605 {
1606         struct ieee80211_local *local = (void *) data;
1607
1608         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1609 }
1610
1611 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1612 {
1613         struct delayed_work *delayed_work = to_delayed_work(work);
1614         struct ieee80211_sub_if_data *sdata =
1615                 container_of(delayed_work, struct ieee80211_sub_if_data,
1616                              dfs_cac_timer_work);
1617         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1618
1619         mutex_lock(&sdata->local->mtx);
1620         if (sdata->wdev.cac_started) {
1621                 ieee80211_vif_release_channel(sdata);
1622                 cfg80211_cac_event(sdata->dev, &chandef,
1623                                    NL80211_RADAR_CAC_FINISHED,
1624                                    GFP_KERNEL);
1625         }
1626         mutex_unlock(&sdata->local->mtx);
1627 }
1628
1629 static bool
1630 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1631 {
1632         struct ieee80211_local *local = sdata->local;
1633         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1634         bool ret = false;
1635         int ac;
1636
1637         if (local->hw.queues < IEEE80211_NUM_ACS)
1638                 return false;
1639
1640         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1641                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1642                 int non_acm_ac;
1643                 unsigned long now = jiffies;
1644
1645                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1646                     tx_tspec->admitted_time &&
1647                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1648                         tx_tspec->consumed_tx_time = 0;
1649                         tx_tspec->time_slice_start = now;
1650
1651                         if (tx_tspec->downgraded)
1652                                 tx_tspec->action =
1653                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1654                 }
1655
1656                 switch (tx_tspec->action) {
1657                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1658                         /* take the original parameters */
1659                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1660                                 sdata_err(sdata,
1661                                           "failed to set TX queue parameters for queue %d\n",
1662                                           ac);
1663                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1664                         tx_tspec->downgraded = false;
1665                         ret = true;
1666                         break;
1667                 case TX_TSPEC_ACTION_DOWNGRADE:
1668                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1669                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1670                                 ret = true;
1671                                 break;
1672                         }
1673                         /* downgrade next lower non-ACM AC */
1674                         for (non_acm_ac = ac + 1;
1675                              non_acm_ac < IEEE80211_NUM_ACS;
1676                              non_acm_ac++)
1677                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1678                                         break;
1679                         /* Usually the loop will result in using BK even if it
1680                          * requires admission control, but such a configuration
1681                          * makes no sense and we have to transmit somehow - the
1682                          * AC selection does the same thing.
1683                          * If we started out trying to downgrade from BK, then
1684                          * the extra condition here might be needed.
1685                          */
1686                         if (non_acm_ac >= IEEE80211_NUM_ACS)
1687                                 non_acm_ac = IEEE80211_AC_BK;
1688                         if (drv_conf_tx(local, sdata, ac,
1689                                         &sdata->tx_conf[non_acm_ac]))
1690                                 sdata_err(sdata,
1691                                           "failed to set TX queue parameters for queue %d\n",
1692                                           ac);
1693                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1694                         ret = true;
1695                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1696                                 tx_tspec->time_slice_start + HZ - now + 1);
1697                         break;
1698                 case TX_TSPEC_ACTION_NONE:
1699                         /* nothing now */
1700                         break;
1701                 }
1702         }
1703
1704         return ret;
1705 }
1706
1707 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1708 {
1709         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1710                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1711 }
1712
1713 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1714 {
1715         struct ieee80211_sub_if_data *sdata;
1716
1717         sdata = container_of(work, struct ieee80211_sub_if_data,
1718                              u.mgd.tx_tspec_wk.work);
1719         ieee80211_sta_handle_tspec_ac_params(sdata);
1720 }
1721
1722 /* MLME */
1723 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1724                                      struct ieee80211_sub_if_data *sdata,
1725                                      const u8 *wmm_param, size_t wmm_param_len)
1726 {
1727         struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1728         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1729         size_t left;
1730         int count, ac;
1731         const u8 *pos;
1732         u8 uapsd_queues = 0;
1733
1734         if (!local->ops->conf_tx)
1735                 return false;
1736
1737         if (local->hw.queues < IEEE80211_NUM_ACS)
1738                 return false;
1739
1740         if (!wmm_param)
1741                 return false;
1742
1743         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1744                 return false;
1745
1746         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1747                 uapsd_queues = ifmgd->uapsd_queues;
1748
1749         count = wmm_param[6] & 0x0f;
1750         if (count == ifmgd->wmm_last_param_set)
1751                 return false;
1752         ifmgd->wmm_last_param_set = count;
1753
1754         pos = wmm_param + 8;
1755         left = wmm_param_len - 8;
1756
1757         memset(&params, 0, sizeof(params));
1758
1759         sdata->wmm_acm = 0;
1760         for (; left >= 4; left -= 4, pos += 4) {
1761                 int aci = (pos[0] >> 5) & 0x03;
1762                 int acm = (pos[0] >> 4) & 0x01;
1763                 bool uapsd = false;
1764
1765                 switch (aci) {
1766                 case 1: /* AC_BK */
1767                         ac = IEEE80211_AC_BK;
1768                         if (acm)
1769                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1770                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1771                                 uapsd = true;
1772                         break;
1773                 case 2: /* AC_VI */
1774                         ac = IEEE80211_AC_VI;
1775                         if (acm)
1776                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1777                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1778                                 uapsd = true;
1779                         break;
1780                 case 3: /* AC_VO */
1781                         ac = IEEE80211_AC_VO;
1782                         if (acm)
1783                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1784                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1785                                 uapsd = true;
1786                         break;
1787                 case 0: /* AC_BE */
1788                 default:
1789                         ac = IEEE80211_AC_BE;
1790                         if (acm)
1791                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1792                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1793                                 uapsd = true;
1794                         break;
1795                 }
1796
1797                 params[ac].aifs = pos[0] & 0x0f;
1798
1799                 if (params[ac].aifs < 2) {
1800                         sdata_info(sdata,
1801                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1802                                    params[ac].aifs, aci);
1803                         params[ac].aifs = 2;
1804                 }
1805                 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1806                 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1807                 params[ac].txop = get_unaligned_le16(pos + 2);
1808                 params[ac].acm = acm;
1809                 params[ac].uapsd = uapsd;
1810
1811                 if (params[ac].cw_min > params[ac].cw_max) {
1812                         sdata_info(sdata,
1813                                    "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1814                                    params[ac].cw_min, params[ac].cw_max, aci);
1815                         return false;
1816                 }
1817         }
1818
1819         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1820                 mlme_dbg(sdata,
1821                          "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1822                          ac, params[ac].acm,
1823                          params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1824                          params[ac].txop, params[ac].uapsd,
1825                          ifmgd->tx_tspec[ac].downgraded);
1826                 sdata->tx_conf[ac] = params[ac];
1827                 if (!ifmgd->tx_tspec[ac].downgraded &&
1828                     drv_conf_tx(local, sdata, ac, &params[ac]))
1829                         sdata_err(sdata,
1830                                   "failed to set TX queue parameters for AC %d\n",
1831                                   ac);
1832         }
1833
1834         /* enable WMM or activate new settings */
1835         sdata->vif.bss_conf.qos = true;
1836         return true;
1837 }
1838
1839 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1840 {
1841         lockdep_assert_held(&sdata->local->mtx);
1842
1843         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1844         ieee80211_run_deferred_scan(sdata->local);
1845 }
1846
1847 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1848 {
1849         mutex_lock(&sdata->local->mtx);
1850         __ieee80211_stop_poll(sdata);
1851         mutex_unlock(&sdata->local->mtx);
1852 }
1853
1854 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1855                                            u16 capab, bool erp_valid, u8 erp)
1856 {
1857         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1858         struct ieee80211_supported_band *sband;
1859         u32 changed = 0;
1860         bool use_protection;
1861         bool use_short_preamble;
1862         bool use_short_slot;
1863
1864         sband = ieee80211_get_sband(sdata);
1865         if (!sband)
1866                 return changed;
1867
1868         if (erp_valid) {
1869                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1870                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1871         } else {
1872                 use_protection = false;
1873                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1874         }
1875
1876         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1877         if (sband->band == NL80211_BAND_5GHZ)
1878                 use_short_slot = true;
1879
1880         if (use_protection != bss_conf->use_cts_prot) {
1881                 bss_conf->use_cts_prot = use_protection;
1882                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1883         }
1884
1885         if (use_short_preamble != bss_conf->use_short_preamble) {
1886                 bss_conf->use_short_preamble = use_short_preamble;
1887                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1888         }
1889
1890         if (use_short_slot != bss_conf->use_short_slot) {
1891                 bss_conf->use_short_slot = use_short_slot;
1892                 changed |= BSS_CHANGED_ERP_SLOT;
1893         }
1894
1895         return changed;
1896 }
1897
1898 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1899                                      struct cfg80211_bss *cbss,
1900                                      u32 bss_info_changed)
1901 {
1902         struct ieee80211_bss *bss = (void *)cbss->priv;
1903         struct ieee80211_local *local = sdata->local;
1904         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1905
1906         bss_info_changed |= BSS_CHANGED_ASSOC;
1907         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1908                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1909
1910         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1911                 beacon_loss_count * bss_conf->beacon_int));
1912
1913         sdata->u.mgd.associated = cbss;
1914         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1915
1916         ieee80211_check_rate_mask(sdata);
1917
1918         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1919
1920         if (sdata->vif.p2p ||
1921             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1922                 const struct cfg80211_bss_ies *ies;
1923
1924                 rcu_read_lock();
1925                 ies = rcu_dereference(cbss->ies);
1926                 if (ies) {
1927                         int ret;
1928
1929                         ret = cfg80211_get_p2p_attr(
1930                                         ies->data, ies->len,
1931                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1932                                         (u8 *) &bss_conf->p2p_noa_attr,
1933                                         sizeof(bss_conf->p2p_noa_attr));
1934                         if (ret >= 2) {
1935                                 sdata->u.mgd.p2p_noa_index =
1936                                         bss_conf->p2p_noa_attr.index;
1937                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1938                         }
1939                 }
1940                 rcu_read_unlock();
1941         }
1942
1943         /* just to be sure */
1944         ieee80211_stop_poll(sdata);
1945
1946         ieee80211_led_assoc(local, 1);
1947
1948         if (sdata->u.mgd.have_beacon) {
1949                 /*
1950                  * If the AP is buggy we may get here with no DTIM period
1951                  * known, so assume it's 1 which is the only safe assumption
1952                  * in that case, although if the TIM IE is broken powersave
1953                  * probably just won't work at all.
1954                  */
1955                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1956                 bss_conf->beacon_rate = bss->beacon_rate;
1957                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1958         } else {
1959                 bss_conf->beacon_rate = NULL;
1960                 bss_conf->dtim_period = 0;
1961         }
1962
1963         bss_conf->assoc = 1;
1964
1965         /* Tell the driver to monitor connection quality (if supported) */
1966         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1967             bss_conf->cqm_rssi_thold)
1968                 bss_info_changed |= BSS_CHANGED_CQM;
1969
1970         /* Enable ARP filtering */
1971         if (bss_conf->arp_addr_cnt)
1972                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1973
1974         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1975
1976         mutex_lock(&local->iflist_mtx);
1977         ieee80211_recalc_ps(local);
1978         mutex_unlock(&local->iflist_mtx);
1979
1980         ieee80211_recalc_smps(sdata);
1981         ieee80211_recalc_ps_vif(sdata);
1982
1983         netif_carrier_on(sdata->dev);
1984 }
1985
1986 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1987                                    u16 stype, u16 reason, bool tx,
1988                                    u8 *frame_buf)
1989 {
1990         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1991         struct ieee80211_local *local = sdata->local;
1992         u32 changed = 0;
1993
1994         sdata_assert_lock(sdata);
1995
1996         if (WARN_ON_ONCE(tx && !frame_buf))
1997                 return;
1998
1999         if (WARN_ON(!ifmgd->associated))
2000                 return;
2001
2002         ieee80211_stop_poll(sdata);
2003
2004         ifmgd->associated = NULL;
2005         netif_carrier_off(sdata->dev);
2006
2007         /*
2008          * if we want to get out of ps before disassoc (why?) we have
2009          * to do it before sending disassoc, as otherwise the null-packet
2010          * won't be valid.
2011          */
2012         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2013                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2014                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2015         }
2016         local->ps_sdata = NULL;
2017
2018         /* disable per-vif ps */
2019         ieee80211_recalc_ps_vif(sdata);
2020
2021         /* make sure ongoing transmission finishes */
2022         synchronize_net();
2023
2024         /*
2025          * drop any frame before deauth/disassoc, this can be data or
2026          * management frame. Since we are disconnecting, we should not
2027          * insist sending these frames which can take time and delay
2028          * the disconnection and possible the roaming.
2029          */
2030         if (tx)
2031                 ieee80211_flush_queues(local, sdata, true);
2032
2033         /* deauthenticate/disassociate now */
2034         if (tx || frame_buf)
2035                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2036                                                reason, tx, frame_buf);
2037
2038         /* flush out frame - make sure the deauth was actually sent */
2039         if (tx)
2040                 ieee80211_flush_queues(local, sdata, false);
2041
2042         /* clear bssid only after building the needed mgmt frames */
2043         eth_zero_addr(ifmgd->bssid);
2044
2045         /* remove AP and TDLS peers */
2046         sta_info_flush(sdata);
2047
2048         /* finally reset all BSS / config parameters */
2049         changed |= ieee80211_reset_erp_info(sdata);
2050
2051         ieee80211_led_assoc(local, 0);
2052         changed |= BSS_CHANGED_ASSOC;
2053         sdata->vif.bss_conf.assoc = false;
2054
2055         ifmgd->p2p_noa_index = -1;
2056         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2057                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2058
2059         /* on the next assoc, re-program HT/VHT parameters */
2060         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2061         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2062         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2063         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2064
2065         /* reset MU-MIMO ownership and group data */
2066         memset(sdata->vif.bss_conf.mu_group.membership, 0,
2067                sizeof(sdata->vif.bss_conf.mu_group.membership));
2068         memset(sdata->vif.bss_conf.mu_group.position, 0,
2069                sizeof(sdata->vif.bss_conf.mu_group.position));
2070         changed |= BSS_CHANGED_MU_GROUPS;
2071         sdata->vif.mu_mimo_owner = false;
2072
2073         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2074
2075         del_timer_sync(&local->dynamic_ps_timer);
2076         cancel_work_sync(&local->dynamic_ps_enable_work);
2077
2078         /* Disable ARP filtering */
2079         if (sdata->vif.bss_conf.arp_addr_cnt)
2080                 changed |= BSS_CHANGED_ARP_FILTER;
2081
2082         sdata->vif.bss_conf.qos = false;
2083         changed |= BSS_CHANGED_QOS;
2084
2085         /* The BSSID (not really interesting) and HT changed */
2086         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2087         ieee80211_bss_info_change_notify(sdata, changed);
2088
2089         /* disassociated - set to defaults now */
2090         ieee80211_set_wmm_default(sdata, false, false);
2091
2092         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2093         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2094         del_timer_sync(&sdata->u.mgd.timer);
2095         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2096
2097         sdata->vif.bss_conf.dtim_period = 0;
2098         sdata->vif.bss_conf.beacon_rate = NULL;
2099
2100         ifmgd->have_beacon = false;
2101
2102         ifmgd->flags = 0;
2103         mutex_lock(&local->mtx);
2104         ieee80211_vif_release_channel(sdata);
2105
2106         sdata->vif.csa_active = false;
2107         ifmgd->csa_waiting_bcn = false;
2108         ifmgd->csa_ignored_same_chan = false;
2109         if (sdata->csa_block_tx) {
2110                 ieee80211_wake_vif_queues(local, sdata,
2111                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2112                 sdata->csa_block_tx = false;
2113         }
2114         mutex_unlock(&local->mtx);
2115
2116         /* existing TX TSPEC sessions no longer exist */
2117         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2118         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2119
2120         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2121 }
2122
2123 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2124                              struct ieee80211_hdr *hdr)
2125 {
2126         /*
2127          * We can postpone the mgd.timer whenever receiving unicast frames
2128          * from AP because we know that the connection is working both ways
2129          * at that time. But multicast frames (and hence also beacons) must
2130          * be ignored here, because we need to trigger the timer during
2131          * data idle periods for sending the periodic probe request to the
2132          * AP we're connected to.
2133          */
2134         if (is_multicast_ether_addr(hdr->addr1))
2135                 return;
2136
2137         ieee80211_sta_reset_conn_monitor(sdata);
2138 }
2139
2140 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2141 {
2142         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2143         struct ieee80211_local *local = sdata->local;
2144
2145         mutex_lock(&local->mtx);
2146         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2147                 goto out;
2148
2149         __ieee80211_stop_poll(sdata);
2150
2151         mutex_lock(&local->iflist_mtx);
2152         ieee80211_recalc_ps(local);
2153         mutex_unlock(&local->iflist_mtx);
2154
2155         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2156                 goto out;
2157
2158         /*
2159          * We've received a probe response, but are not sure whether
2160          * we have or will be receiving any beacons or data, so let's
2161          * schedule the timers again, just in case.
2162          */
2163         ieee80211_sta_reset_beacon_monitor(sdata);
2164
2165         mod_timer(&ifmgd->conn_mon_timer,
2166                   round_jiffies_up(jiffies +
2167                                    IEEE80211_CONNECTION_IDLE_TIME));
2168 out:
2169         mutex_unlock(&local->mtx);
2170 }
2171
2172 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2173                                            struct ieee80211_hdr *hdr,
2174                                            u16 tx_time)
2175 {
2176         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2177         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2178         int ac = ieee80211_ac_from_tid(tid);
2179         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2180         unsigned long now = jiffies;
2181
2182         if (likely(!tx_tspec->admitted_time))
2183                 return;
2184
2185         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2186                 tx_tspec->consumed_tx_time = 0;
2187                 tx_tspec->time_slice_start = now;
2188
2189                 if (tx_tspec->downgraded) {
2190                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2191                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2192                 }
2193         }
2194
2195         if (tx_tspec->downgraded)
2196                 return;
2197
2198         tx_tspec->consumed_tx_time += tx_time;
2199
2200         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2201                 tx_tspec->downgraded = true;
2202                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2203                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2204         }
2205 }
2206
2207 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2208                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2209 {
2210         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2211
2212         if (!ieee80211_is_data(hdr->frame_control))
2213             return;
2214
2215         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2216             sdata->u.mgd.probe_send_count > 0) {
2217                 if (ack)
2218                         ieee80211_sta_reset_conn_monitor(sdata);
2219                 else
2220                         sdata->u.mgd.nullfunc_failed = true;
2221                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2222                 return;
2223         }
2224
2225         if (ack)
2226                 ieee80211_sta_reset_conn_monitor(sdata);
2227 }
2228
2229 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2230 {
2231         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2232         const u8 *ssid;
2233         u8 *dst = ifmgd->associated->bssid;
2234         u8 unicast_limit = max(1, max_probe_tries - 3);
2235         struct sta_info *sta;
2236
2237         /*
2238          * Try sending broadcast probe requests for the last three
2239          * probe requests after the first ones failed since some
2240          * buggy APs only support broadcast probe requests.
2241          */
2242         if (ifmgd->probe_send_count >= unicast_limit)
2243                 dst = NULL;
2244
2245         /*
2246          * When the hardware reports an accurate Tx ACK status, it's
2247          * better to send a nullfunc frame instead of a probe request,
2248          * as it will kick us off the AP quickly if we aren't associated
2249          * anymore. The timeout will be reset if the frame is ACKed by
2250          * the AP.
2251          */
2252         ifmgd->probe_send_count++;
2253
2254         if (dst) {
2255                 mutex_lock(&sdata->local->sta_mtx);
2256                 sta = sta_info_get(sdata, dst);
2257                 if (!WARN_ON(!sta))
2258                         ieee80211_check_fast_rx(sta);
2259                 mutex_unlock(&sdata->local->sta_mtx);
2260         }
2261
2262         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2263                 ifmgd->nullfunc_failed = false;
2264                 ieee80211_send_nullfunc(sdata->local, sdata, false);
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);
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         /* AP is probably out of range (or not reachable for another reason) so
2418          * remove the bss struct for that AP.
2419          */
2420         cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
2421
2422         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2423                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2424                                true, frame_buf);
2425         mutex_lock(&local->mtx);
2426         sdata->vif.csa_active = false;
2427         ifmgd->csa_waiting_bcn = false;
2428         if (sdata->csa_block_tx) {
2429                 ieee80211_wake_vif_queues(local, sdata,
2430                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2431                 sdata->csa_block_tx = false;
2432         }
2433         mutex_unlock(&local->mtx);
2434
2435         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2436                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2437
2438         sdata_unlock(sdata);
2439 }
2440
2441 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2442 {
2443         struct ieee80211_sub_if_data *sdata =
2444                 container_of(work, struct ieee80211_sub_if_data,
2445                              u.mgd.beacon_connection_loss_work);
2446         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2447
2448         if (ifmgd->associated)
2449                 ifmgd->beacon_loss_count++;
2450
2451         if (ifmgd->connection_loss) {
2452                 sdata_info(sdata, "Connection to AP %pM lost\n",
2453                            ifmgd->bssid);
2454                 __ieee80211_disconnect(sdata);
2455         } else {
2456                 ieee80211_mgd_probe_ap(sdata, true);
2457         }
2458 }
2459
2460 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2461 {
2462         struct ieee80211_sub_if_data *sdata =
2463                 container_of(work, struct ieee80211_sub_if_data,
2464                              u.mgd.csa_connection_drop_work);
2465
2466         __ieee80211_disconnect(sdata);
2467 }
2468
2469 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2470 {
2471         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2472         struct ieee80211_hw *hw = &sdata->local->hw;
2473
2474         trace_api_beacon_loss(sdata);
2475
2476         sdata->u.mgd.connection_loss = false;
2477         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2478 }
2479 EXPORT_SYMBOL(ieee80211_beacon_loss);
2480
2481 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2482 {
2483         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2484         struct ieee80211_hw *hw = &sdata->local->hw;
2485
2486         trace_api_connection_loss(sdata);
2487
2488         sdata->u.mgd.connection_loss = true;
2489         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2490 }
2491 EXPORT_SYMBOL(ieee80211_connection_loss);
2492
2493
2494 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2495                                         bool assoc)
2496 {
2497         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2498
2499         sdata_assert_lock(sdata);
2500
2501         if (!assoc) {
2502                 /*
2503                  * we are not authenticated yet, the only timer that could be
2504                  * running is the timeout for the authentication response which
2505                  * which is not relevant anymore.
2506                  */
2507                 del_timer_sync(&sdata->u.mgd.timer);
2508                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2509
2510                 eth_zero_addr(sdata->u.mgd.bssid);
2511                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2512                 sdata->u.mgd.flags = 0;
2513                 mutex_lock(&sdata->local->mtx);
2514                 ieee80211_vif_release_channel(sdata);
2515                 mutex_unlock(&sdata->local->mtx);
2516         }
2517
2518         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2519         kfree(auth_data);
2520         sdata->u.mgd.auth_data = NULL;
2521 }
2522
2523 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2524                                          bool assoc, bool abandon)
2525 {
2526         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2527
2528         sdata_assert_lock(sdata);
2529
2530         if (!assoc) {
2531                 /*
2532                  * we are not associated yet, the only timer that could be
2533                  * running is the timeout for the association response which
2534                  * which is not relevant anymore.
2535                  */
2536                 del_timer_sync(&sdata->u.mgd.timer);
2537                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2538
2539                 eth_zero_addr(sdata->u.mgd.bssid);
2540                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2541                 sdata->u.mgd.flags = 0;
2542                 sdata->vif.mu_mimo_owner = false;
2543
2544                 mutex_lock(&sdata->local->mtx);
2545                 ieee80211_vif_release_channel(sdata);
2546                 mutex_unlock(&sdata->local->mtx);
2547
2548                 if (abandon)
2549                         cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2550         }
2551
2552         kfree(assoc_data);
2553         sdata->u.mgd.assoc_data = NULL;
2554 }
2555
2556 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2557                                      struct ieee80211_mgmt *mgmt, size_t len)
2558 {
2559         struct ieee80211_local *local = sdata->local;
2560         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2561         u8 *pos;
2562         struct ieee802_11_elems elems;
2563         u32 tx_flags = 0;
2564
2565         pos = mgmt->u.auth.variable;
2566         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2567         if (!elems.challenge)
2568                 return;
2569         auth_data->expected_transaction = 4;
2570         drv_mgd_prepare_tx(sdata->local, sdata);
2571         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2572                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2573                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2574         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2575                             elems.challenge - 2, elems.challenge_len + 2,
2576                             auth_data->bss->bssid, auth_data->bss->bssid,
2577                             auth_data->key, auth_data->key_len,
2578                             auth_data->key_idx, tx_flags);
2579 }
2580
2581 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2582                                    struct ieee80211_mgmt *mgmt, size_t len)
2583 {
2584         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2585         u8 bssid[ETH_ALEN];
2586         u16 auth_alg, auth_transaction, status_code;
2587         struct sta_info *sta;
2588         struct ieee80211_event event = {
2589                 .type = MLME_EVENT,
2590                 .u.mlme.data = AUTH_EVENT,
2591         };
2592
2593         sdata_assert_lock(sdata);
2594
2595         if (len < 24 + 6)
2596                 return;
2597
2598         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2599                 return;
2600
2601         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2602
2603         if (!ether_addr_equal(bssid, mgmt->bssid))
2604                 return;
2605
2606         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2607         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2608         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2609
2610         if (auth_alg != ifmgd->auth_data->algorithm ||
2611             auth_transaction != ifmgd->auth_data->expected_transaction) {
2612                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2613                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2614                            auth_transaction,
2615                            ifmgd->auth_data->expected_transaction);
2616                 return;
2617         }
2618
2619         if (status_code != WLAN_STATUS_SUCCESS) {
2620                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2621                            mgmt->sa, status_code);
2622                 ieee80211_destroy_auth_data(sdata, false);
2623                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2624                 event.u.mlme.status = MLME_DENIED;
2625                 event.u.mlme.reason = status_code;
2626                 drv_event_callback(sdata->local, sdata, &event);
2627                 return;
2628         }
2629
2630         switch (ifmgd->auth_data->algorithm) {
2631         case WLAN_AUTH_OPEN:
2632         case WLAN_AUTH_LEAP:
2633         case WLAN_AUTH_FT:
2634         case WLAN_AUTH_SAE:
2635         case WLAN_AUTH_FILS_SK:
2636         case WLAN_AUTH_FILS_SK_PFS:
2637         case WLAN_AUTH_FILS_PK:
2638                 break;
2639         case WLAN_AUTH_SHARED_KEY:
2640                 if (ifmgd->auth_data->expected_transaction != 4) {
2641                         ieee80211_auth_challenge(sdata, mgmt, len);
2642                         /* need another frame */
2643                         return;
2644                 }
2645                 break;
2646         default:
2647                 WARN_ONCE(1, "invalid auth alg %d",
2648                           ifmgd->auth_data->algorithm);
2649                 return;
2650         }
2651
2652         event.u.mlme.status = MLME_SUCCESS;
2653         drv_event_callback(sdata->local, sdata, &event);
2654         sdata_info(sdata, "authenticated\n");
2655         ifmgd->auth_data->done = true;
2656         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2657         ifmgd->auth_data->timeout_started = true;
2658         run_again(sdata, ifmgd->auth_data->timeout);
2659
2660         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2661             ifmgd->auth_data->expected_transaction != 2) {
2662                 /*
2663                  * Report auth frame to user space for processing since another
2664                  * round of Authentication frames is still needed.
2665                  */
2666                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2667                 return;
2668         }
2669
2670         /* move station state to auth */
2671         mutex_lock(&sdata->local->sta_mtx);
2672         sta = sta_info_get(sdata, bssid);
2673         if (!sta) {
2674                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2675                 goto out_err;
2676         }
2677         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2678                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2679                 goto out_err;
2680         }
2681         mutex_unlock(&sdata->local->sta_mtx);
2682
2683         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2684         return;
2685  out_err:
2686         mutex_unlock(&sdata->local->sta_mtx);
2687         /* ignore frame -- wait for timeout */
2688 }
2689
2690 #define case_WLAN(type) \
2691         case WLAN_REASON_##type: return #type
2692
2693 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2694 {
2695         switch (reason_code) {
2696         case_WLAN(UNSPECIFIED);
2697         case_WLAN(PREV_AUTH_NOT_VALID);
2698         case_WLAN(DEAUTH_LEAVING);
2699         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2700         case_WLAN(DISASSOC_AP_BUSY);
2701         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2702         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2703         case_WLAN(DISASSOC_STA_HAS_LEFT);
2704         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2705         case_WLAN(DISASSOC_BAD_POWER);
2706         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2707         case_WLAN(INVALID_IE);
2708         case_WLAN(MIC_FAILURE);
2709         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2710         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2711         case_WLAN(IE_DIFFERENT);
2712         case_WLAN(INVALID_GROUP_CIPHER);
2713         case_WLAN(INVALID_PAIRWISE_CIPHER);
2714         case_WLAN(INVALID_AKMP);
2715         case_WLAN(UNSUPP_RSN_VERSION);
2716         case_WLAN(INVALID_RSN_IE_CAP);
2717         case_WLAN(IEEE8021X_FAILED);
2718         case_WLAN(CIPHER_SUITE_REJECTED);
2719         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2720         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2721         case_WLAN(DISASSOC_LOW_ACK);
2722         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2723         case_WLAN(QSTA_LEAVE_QBSS);
2724         case_WLAN(QSTA_NOT_USE);
2725         case_WLAN(QSTA_REQUIRE_SETUP);
2726         case_WLAN(QSTA_TIMEOUT);
2727         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2728         case_WLAN(MESH_PEER_CANCELED);
2729         case_WLAN(MESH_MAX_PEERS);
2730         case_WLAN(MESH_CONFIG);
2731         case_WLAN(MESH_CLOSE);
2732         case_WLAN(MESH_MAX_RETRIES);
2733         case_WLAN(MESH_CONFIRM_TIMEOUT);
2734         case_WLAN(MESH_INVALID_GTK);
2735         case_WLAN(MESH_INCONSISTENT_PARAM);
2736         case_WLAN(MESH_INVALID_SECURITY);
2737         case_WLAN(MESH_PATH_ERROR);
2738         case_WLAN(MESH_PATH_NOFORWARD);
2739         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2740         case_WLAN(MAC_EXISTS_IN_MBSS);
2741         case_WLAN(MESH_CHAN_REGULATORY);
2742         case_WLAN(MESH_CHAN);
2743         default: return "<unknown>";
2744         }
2745 }
2746
2747 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2748                                      struct ieee80211_mgmt *mgmt, size_t len)
2749 {
2750         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2751         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2752
2753         sdata_assert_lock(sdata);
2754
2755         if (len < 24 + 2)
2756                 return;
2757
2758         if (ifmgd->associated &&
2759             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2760                 const u8 *bssid = ifmgd->associated->bssid;
2761
2762                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2763                            bssid, reason_code,
2764                            ieee80211_get_reason_code_string(reason_code));
2765
2766                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2767
2768                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2769                                             reason_code);
2770                 return;
2771         }
2772
2773         if (ifmgd->assoc_data &&
2774             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2775                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2776
2777                 sdata_info(sdata,
2778                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2779                            bssid, reason_code,
2780                            ieee80211_get_reason_code_string(reason_code));
2781
2782                 ieee80211_destroy_assoc_data(sdata, false, true);
2783
2784                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2785                 return;
2786         }
2787 }
2788
2789
2790 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2791                                        struct ieee80211_mgmt *mgmt, size_t len)
2792 {
2793         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2794         u16 reason_code;
2795
2796         sdata_assert_lock(sdata);
2797
2798         if (len < 24 + 2)
2799                 return;
2800
2801         if (!ifmgd->associated ||
2802             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2803                 return;
2804
2805         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2806
2807         sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
2808                    mgmt->sa, reason_code,
2809                    ieee80211_get_reason_code_string(reason_code));
2810
2811         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2812
2813         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2814 }
2815
2816 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2817                                 u8 *supp_rates, unsigned int supp_rates_len,
2818                                 u32 *rates, u32 *basic_rates,
2819                                 bool *have_higher_than_11mbit,
2820                                 int *min_rate, int *min_rate_index,
2821                                 int shift, u32 rate_flags)
2822 {
2823         int i, j;
2824
2825         for (i = 0; i < supp_rates_len; i++) {
2826                 int rate = supp_rates[i] & 0x7f;
2827                 bool is_basic = !!(supp_rates[i] & 0x80);
2828
2829                 if ((rate * 5 * (1 << shift)) > 110)
2830                         *have_higher_than_11mbit = true;
2831
2832                 /*
2833                  * Skip HT and VHT BSS membership selectors since they're not
2834                  * rates.
2835                  *
2836                  * Note: Even though the membership selector and the basic
2837                  *       rate flag share the same bit, they are not exactly
2838                  *       the same.
2839                  */
2840                 if (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) ||
2841                     supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY))
2842                         continue;
2843
2844                 for (j = 0; j < sband->n_bitrates; j++) {
2845                         struct ieee80211_rate *br;
2846                         int brate;
2847
2848                         br = &sband->bitrates[j];
2849                         if ((rate_flags & br->flags) != rate_flags)
2850                                 continue;
2851
2852                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2853                         if (brate == rate) {
2854                                 *rates |= BIT(j);
2855                                 if (is_basic)
2856                                         *basic_rates |= BIT(j);
2857                                 if ((rate * 5) < *min_rate) {
2858                                         *min_rate = rate * 5;
2859                                         *min_rate_index = j;
2860                                 }
2861                                 break;
2862                         }
2863                 }
2864         }
2865 }
2866
2867 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2868                                     struct cfg80211_bss *cbss,
2869                                     struct ieee80211_mgmt *mgmt, size_t len)
2870 {
2871         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2872         struct ieee80211_local *local = sdata->local;
2873         struct ieee80211_supported_band *sband;
2874         struct sta_info *sta;
2875         u8 *pos;
2876         u16 capab_info, aid;
2877         struct ieee802_11_elems elems;
2878         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2879         const struct cfg80211_bss_ies *bss_ies = NULL;
2880         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2881         u32 changed = 0;
2882         int err;
2883         bool ret;
2884
2885         /* AssocResp and ReassocResp have identical structure */
2886
2887         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2888         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2889
2890         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2891                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2892                            aid);
2893         aid &= ~(BIT(15) | BIT(14));
2894
2895         ifmgd->broken_ap = false;
2896
2897         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2898                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2899                            aid);
2900                 aid = 0;
2901                 ifmgd->broken_ap = true;
2902         }
2903
2904         pos = mgmt->u.assoc_resp.variable;
2905         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2906
2907         if (!elems.supp_rates) {
2908                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2909                 return false;
2910         }
2911
2912         ifmgd->aid = aid;
2913         ifmgd->tdls_chan_switch_prohibited =
2914                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2915                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2916
2917         /*
2918          * Some APs are erroneously not including some information in their
2919          * (re)association response frames. Try to recover by using the data
2920          * from the beacon or probe response. This seems to afflict mobile
2921          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2922          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2923          */
2924         if ((assoc_data->wmm && !elems.wmm_param) ||
2925             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2926              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2927             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2928              (!elems.vht_cap_elem || !elems.vht_operation))) {
2929                 const struct cfg80211_bss_ies *ies;
2930                 struct ieee802_11_elems bss_elems;
2931
2932                 rcu_read_lock();
2933                 ies = rcu_dereference(cbss->ies);
2934                 if (ies)
2935                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2936                                           GFP_ATOMIC);
2937                 rcu_read_unlock();
2938                 if (!bss_ies)
2939                         return false;
2940
2941                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2942                                        false, &bss_elems);
2943                 if (assoc_data->wmm &&
2944                     !elems.wmm_param && bss_elems.wmm_param) {
2945                         elems.wmm_param = bss_elems.wmm_param;
2946                         sdata_info(sdata,
2947                                    "AP bug: WMM param missing from AssocResp\n");
2948                 }
2949
2950                 /*
2951                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2952                  * have to include the IEs in the (re)association response.
2953                  */
2954                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2955                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2956                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2957                         sdata_info(sdata,
2958                                    "AP bug: HT capability missing from AssocResp\n");
2959                 }
2960                 if (!elems.ht_operation && bss_elems.ht_operation &&
2961                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2962                         elems.ht_operation = bss_elems.ht_operation;
2963                         sdata_info(sdata,
2964                                    "AP bug: HT operation missing from AssocResp\n");
2965                 }
2966                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2967                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2968                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2969                         sdata_info(sdata,
2970                                    "AP bug: VHT capa missing from AssocResp\n");
2971                 }
2972                 if (!elems.vht_operation && bss_elems.vht_operation &&
2973                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2974                         elems.vht_operation = bss_elems.vht_operation;
2975                         sdata_info(sdata,
2976                                    "AP bug: VHT operation missing from AssocResp\n");
2977                 }
2978         }
2979
2980         /*
2981          * We previously checked these in the beacon/probe response, so
2982          * they should be present here. This is just a safety net.
2983          */
2984         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2985             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2986                 sdata_info(sdata,
2987                            "HT AP is missing WMM params or HT capability/operation\n");
2988                 ret = false;
2989                 goto out;
2990         }
2991
2992         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2993             (!elems.vht_cap_elem || !elems.vht_operation)) {
2994                 sdata_info(sdata,
2995                            "VHT AP is missing VHT capability/operation\n");
2996                 ret = false;
2997                 goto out;
2998         }
2999
3000         mutex_lock(&sdata->local->sta_mtx);
3001         /*
3002          * station info was already allocated and inserted before
3003          * the association and should be available to us
3004          */
3005         sta = sta_info_get(sdata, cbss->bssid);
3006         if (WARN_ON(!sta)) {
3007                 mutex_unlock(&sdata->local->sta_mtx);
3008                 ret = false;
3009                 goto out;
3010         }
3011
3012         sband = ieee80211_get_sband(sdata);
3013         if (!sband) {
3014                 mutex_unlock(&sdata->local->sta_mtx);
3015                 ret = false;
3016                 goto out;
3017         }
3018
3019         /* Set up internal HT/VHT capabilities */
3020         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3021                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3022                                                   elems.ht_cap_elem, sta);
3023
3024         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3025                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3026                                                     elems.vht_cap_elem, sta);
3027
3028         /*
3029          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3030          * in their association response, so ignore that data for our own
3031          * configuration. If it changed since the last beacon, we'll get the
3032          * next beacon and update then.
3033          */
3034
3035         /*
3036          * If an operating mode notification IE is present, override the
3037          * NSS calculation (that would be done in rate_control_rate_init())
3038          * and use the # of streams from that element.
3039          */
3040         if (elems.opmode_notif &&
3041             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3042                 u8 nss;
3043
3044                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3045                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3046                 nss += 1;
3047                 sta->sta.rx_nss = nss;
3048         }
3049
3050         rate_control_rate_init(sta);
3051
3052         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3053                 set_sta_flag(sta, WLAN_STA_MFP);
3054                 sta->sta.mfp = true;
3055         } else {
3056                 sta->sta.mfp = false;
3057         }
3058
3059         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3060
3061         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3062         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3063                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3064         if (err) {
3065                 sdata_info(sdata,
3066                            "failed to move station %pM to desired state\n",
3067                            sta->sta.addr);
3068                 WARN_ON(__sta_info_destroy(sta));
3069                 mutex_unlock(&sdata->local->sta_mtx);
3070                 ret = false;
3071                 goto out;
3072         }
3073
3074         mutex_unlock(&sdata->local->sta_mtx);
3075
3076         /*
3077          * Always handle WMM once after association regardless
3078          * of the first value the AP uses. Setting -1 here has
3079          * that effect because the AP values is an unsigned
3080          * 4-bit value.
3081          */
3082         ifmgd->wmm_last_param_set = -1;
3083
3084         if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3085                 ieee80211_set_wmm_default(sdata, false, false);
3086         } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3087                                              elems.wmm_param_len)) {
3088                 /* still enable QoS since we might have HT/VHT */
3089                 ieee80211_set_wmm_default(sdata, false, true);
3090                 /* set the disable-WMM flag in this case to disable
3091                  * tracking WMM parameter changes in the beacon if
3092                  * the parameters weren't actually valid. Doing so
3093                  * avoids changing parameters very strangely when
3094                  * the AP is going back and forth between valid and
3095                  * invalid parameters.
3096                  */
3097                 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3098         }
3099         changed |= BSS_CHANGED_QOS;
3100
3101         if (elems.max_idle_period_ie) {
3102                 bss_conf->max_idle_period =
3103                         le16_to_cpu(elems.max_idle_period_ie->max_idle_period);
3104                 bss_conf->protected_keep_alive =
3105                         !!(elems.max_idle_period_ie->idle_options &
3106                            WLAN_IDLE_OPTIONS_PROTECTED_KEEP_ALIVE);
3107                 changed |= BSS_CHANGED_KEEP_ALIVE;
3108         } else {
3109                 bss_conf->max_idle_period = 0;
3110                 bss_conf->protected_keep_alive = false;
3111         }
3112
3113         /* set AID and assoc capability,
3114          * ieee80211_set_associated() will tell the driver */
3115         bss_conf->aid = aid;
3116         bss_conf->assoc_capability = capab_info;
3117         ieee80211_set_associated(sdata, cbss, changed);
3118
3119         /*
3120          * If we're using 4-addr mode, let the AP know that we're
3121          * doing so, so that it can create the STA VLAN on its side
3122          */
3123         if (ifmgd->use_4addr)
3124                 ieee80211_send_4addr_nullfunc(local, sdata);
3125
3126         /*
3127          * Start timer to probe the connection to the AP now.
3128          * Also start the timer that will detect beacon loss.
3129          */
3130         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3131         ieee80211_sta_reset_beacon_monitor(sdata);
3132
3133         ret = true;
3134  out:
3135         kfree(bss_ies);
3136         return ret;
3137 }
3138
3139 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3140                                          struct ieee80211_mgmt *mgmt,
3141                                          size_t len)
3142 {
3143         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3144         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3145         u16 capab_info, status_code, aid;
3146         struct ieee802_11_elems elems;
3147         int ac, uapsd_queues = -1;
3148         u8 *pos;
3149         bool reassoc;
3150         struct cfg80211_bss *bss;
3151         struct ieee80211_event event = {
3152                 .type = MLME_EVENT,
3153                 .u.mlme.data = ASSOC_EVENT,
3154         };
3155
3156         sdata_assert_lock(sdata);
3157
3158         if (!assoc_data)
3159                 return;
3160         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3161                 return;
3162
3163         /*
3164          * AssocResp and ReassocResp have identical structure, so process both
3165          * of them in this function.
3166          */
3167
3168         if (len < 24 + 6)
3169                 return;
3170
3171         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3172         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3173         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3174         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3175
3176         sdata_info(sdata,
3177                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3178                    reassoc ? "Rea" : "A", mgmt->sa,
3179                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3180
3181         if (assoc_data->fils_kek_len &&
3182             fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
3183                 return;
3184
3185         pos = mgmt->u.assoc_resp.variable;
3186         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3187
3188         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3189             elems.timeout_int &&
3190             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3191                 u32 tu, ms;
3192                 tu = le32_to_cpu(elems.timeout_int->value);
3193                 ms = tu * 1024 / 1000;
3194                 sdata_info(sdata,
3195                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3196                            mgmt->sa, tu, ms);
3197                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3198                 assoc_data->timeout_started = true;
3199                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3200                         run_again(sdata, assoc_data->timeout);
3201                 return;
3202         }
3203
3204         bss = assoc_data->bss;
3205
3206         if (status_code != WLAN_STATUS_SUCCESS) {
3207                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3208                            mgmt->sa, status_code);
3209                 ieee80211_destroy_assoc_data(sdata, false, false);
3210                 event.u.mlme.status = MLME_DENIED;
3211                 event.u.mlme.reason = status_code;
3212                 drv_event_callback(sdata->local, sdata, &event);
3213         } else {
3214                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3215                         /* oops -- internal error -- send timeout for now */
3216                         ieee80211_destroy_assoc_data(sdata, false, false);
3217                         cfg80211_assoc_timeout(sdata->dev, bss);
3218                         return;
3219                 }
3220                 event.u.mlme.status = MLME_SUCCESS;
3221                 drv_event_callback(sdata->local, sdata, &event);
3222                 sdata_info(sdata, "associated\n");
3223
3224                 /*
3225                  * destroy assoc_data afterwards, as otherwise an idle
3226                  * recalc after assoc_data is NULL but before associated
3227                  * is set can cause the interface to go idle
3228                  */
3229                 ieee80211_destroy_assoc_data(sdata, true, false);
3230
3231                 /* get uapsd queues configuration */
3232                 uapsd_queues = 0;
3233                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3234                         if (sdata->tx_conf[ac].uapsd)
3235                                 uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
3236         }
3237
3238         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3239 }
3240
3241 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3242                                   struct ieee80211_mgmt *mgmt, size_t len,
3243                                   struct ieee80211_rx_status *rx_status,
3244                                   struct ieee802_11_elems *elems)
3245 {
3246         struct ieee80211_local *local = sdata->local;
3247         struct ieee80211_bss *bss;
3248         struct ieee80211_channel *channel;
3249
3250         sdata_assert_lock(sdata);
3251
3252         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3253         if (!channel)
3254                 return;
3255
3256         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3257                                         channel);
3258         if (bss) {
3259                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3260                 ieee80211_rx_bss_put(local, bss);
3261         }
3262 }
3263
3264
3265 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3266                                          struct sk_buff *skb)
3267 {
3268         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3269         struct ieee80211_if_managed *ifmgd;
3270         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3271         size_t baselen, len = skb->len;
3272         struct ieee802_11_elems elems;
3273
3274         ifmgd = &sdata->u.mgd;
3275
3276         sdata_assert_lock(sdata);
3277
3278         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3279                 return; /* ignore ProbeResp to foreign address */
3280
3281         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3282         if (baselen > len)
3283                 return;
3284
3285         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3286                                false, &elems);
3287
3288         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3289
3290         if (ifmgd->associated &&
3291             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3292                 ieee80211_reset_ap_probe(sdata);
3293 }
3294
3295 /*
3296  * This is the canonical list of information elements we care about,
3297  * the filter code also gives us all changes to the Microsoft OUI
3298  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3299  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3300  * changes to requested client power.
3301  *
3302  * We implement beacon filtering in software since that means we can
3303  * avoid processing the frame here and in cfg80211, and userspace
3304  * will not be able to tell whether the hardware supports it or not.
3305  *
3306  * XXX: This list needs to be dynamic -- userspace needs to be able to
3307  *      add items it requires. It also needs to be able to tell us to
3308  *      look out for other vendor IEs.
3309  */
3310 static const u64 care_about_ies =
3311         (1ULL << WLAN_EID_COUNTRY) |
3312         (1ULL << WLAN_EID_ERP_INFO) |
3313         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3314         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3315         (1ULL << WLAN_EID_HT_CAPABILITY) |
3316         (1ULL << WLAN_EID_HT_OPERATION) |
3317         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3318
3319 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3320                                      struct ieee80211_mgmt *mgmt, size_t len,
3321                                      struct ieee80211_rx_status *rx_status)
3322 {
3323         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3324         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3325         size_t baselen;
3326         struct ieee802_11_elems elems;
3327         struct ieee80211_local *local = sdata->local;
3328         struct ieee80211_chanctx_conf *chanctx_conf;
3329         struct ieee80211_channel *chan;
3330         struct sta_info *sta;
3331         u32 changed = 0;
3332         bool erp_valid;
3333         u8 erp_value = 0;
3334         u32 ncrc;
3335         u8 *bssid;
3336         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3337
3338         sdata_assert_lock(sdata);
3339
3340         /* Process beacon from the current BSS */
3341         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3342         if (baselen > len)
3343                 return;
3344
3345         rcu_read_lock();
3346         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3347         if (!chanctx_conf) {
3348                 rcu_read_unlock();
3349                 return;
3350         }
3351
3352         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3353                 rcu_read_unlock();
3354                 return;
3355         }
3356         chan = chanctx_conf->def.chan;
3357         rcu_read_unlock();
3358
3359         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3360             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3361                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3362                                        len - baselen, false, &elems);
3363
3364                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3365                 if (elems.tim && !elems.parse_error) {
3366                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3367                         ifmgd->dtim_period = tim_ie->dtim_period;
3368                 }
3369                 ifmgd->have_beacon = true;
3370                 ifmgd->assoc_data->need_beacon = false;
3371                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3372                         sdata->vif.bss_conf.sync_tsf =
3373                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3374                         sdata->vif.bss_conf.sync_device_ts =
3375                                 rx_status->device_timestamp;
3376                         if (elems.tim)
3377                                 sdata->vif.bss_conf.sync_dtim_count =
3378                                         elems.tim->dtim_count;
3379                         else
3380                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3381                 }
3382                 /* continue assoc process */
3383                 ifmgd->assoc_data->timeout = jiffies;
3384                 ifmgd->assoc_data->timeout_started = true;
3385                 run_again(sdata, ifmgd->assoc_data->timeout);
3386                 return;
3387         }
3388
3389         if (!ifmgd->associated ||
3390             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3391                 return;
3392         bssid = ifmgd->associated->bssid;
3393
3394         /* Track average RSSI from the Beacon frames of the current AP */
3395         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3396                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3397                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3398                 ifmgd->last_cqm_event_signal = 0;
3399                 ifmgd->count_beacon_signal = 1;
3400                 ifmgd->last_ave_beacon_signal = 0;
3401         } else {
3402                 ifmgd->count_beacon_signal++;
3403         }
3404
3405         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3406
3407         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3408             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3409                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3410                 int last_sig = ifmgd->last_ave_beacon_signal;
3411                 struct ieee80211_event event = {
3412                         .type = RSSI_EVENT,
3413                 };
3414
3415                 /*
3416                  * if signal crosses either of the boundaries, invoke callback
3417                  * with appropriate parameters
3418                  */
3419                 if (sig > ifmgd->rssi_max_thold &&
3420                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3421                         ifmgd->last_ave_beacon_signal = sig;
3422                         event.u.rssi.data = RSSI_EVENT_HIGH;
3423                         drv_event_callback(local, sdata, &event);
3424                 } else if (sig < ifmgd->rssi_min_thold &&
3425                            (last_sig >= ifmgd->rssi_max_thold ||
3426                            last_sig == 0)) {
3427                         ifmgd->last_ave_beacon_signal = sig;
3428                         event.u.rssi.data = RSSI_EVENT_LOW;
3429                         drv_event_callback(local, sdata, &event);
3430                 }
3431         }
3432
3433         if (bss_conf->cqm_rssi_thold &&
3434             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3435             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3436                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3437                 int last_event = ifmgd->last_cqm_event_signal;
3438                 int thold = bss_conf->cqm_rssi_thold;
3439                 int hyst = bss_conf->cqm_rssi_hyst;
3440
3441                 if (sig < thold &&
3442                     (last_event == 0 || sig < last_event - hyst)) {
3443                         ifmgd->last_cqm_event_signal = sig;
3444                         ieee80211_cqm_rssi_notify(
3445                                 &sdata->vif,
3446                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3447                                 sig, GFP_KERNEL);
3448                 } else if (sig > thold &&
3449                            (last_event == 0 || sig > last_event + hyst)) {
3450                         ifmgd->last_cqm_event_signal = sig;
3451                         ieee80211_cqm_rssi_notify(
3452                                 &sdata->vif,
3453                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3454                                 sig, GFP_KERNEL);
3455                 }
3456         }
3457
3458         if (bss_conf->cqm_rssi_low &&
3459             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3460                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3461                 int last_event = ifmgd->last_cqm_event_signal;
3462                 int low = bss_conf->cqm_rssi_low;
3463                 int high = bss_conf->cqm_rssi_high;
3464
3465                 if (sig < low &&
3466                     (last_event == 0 || last_event >= low)) {
3467                         ifmgd->last_cqm_event_signal = sig;
3468                         ieee80211_cqm_rssi_notify(
3469                                 &sdata->vif,
3470                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3471                                 sig, GFP_KERNEL);
3472                 } else if (sig > high &&
3473                            (last_event == 0 || last_event <= high)) {
3474                         ifmgd->last_cqm_event_signal = sig;
3475                         ieee80211_cqm_rssi_notify(
3476                                 &sdata->vif,
3477                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3478                                 sig, GFP_KERNEL);
3479                 }
3480         }
3481
3482         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3483                 mlme_dbg_ratelimited(sdata,
3484                                      "cancelling AP probe due to a received beacon\n");
3485                 ieee80211_reset_ap_probe(sdata);
3486         }
3487
3488         /*
3489          * Push the beacon loss detection into the future since
3490          * we are processing a beacon from the AP just now.
3491          */
3492         ieee80211_sta_reset_beacon_monitor(sdata);
3493
3494         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3495         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3496                                           len - baselen, false, &elems,
3497                                           care_about_ies, ncrc);
3498
3499         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3500             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3501                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3502                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3503                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3504                                 ieee80211_hw_config(local,
3505                                                     IEEE80211_CONF_CHANGE_PS);
3506                         }
3507                         ieee80211_send_nullfunc(local, sdata, false);
3508                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3509                         local->pspolling = true;
3510
3511                         /*
3512                          * Here is assumed that the driver will be
3513                          * able to send ps-poll frame and receive a
3514                          * response even though power save mode is
3515                          * enabled, but some drivers might require
3516                          * to disable power save here. This needs
3517                          * to be investigated.
3518                          */
3519                         ieee80211_send_pspoll(local, sdata);
3520                 }
3521         }
3522
3523         if (sdata->vif.p2p ||
3524             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3525                 struct ieee80211_p2p_noa_attr noa = {};
3526                 int ret;
3527
3528                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3529                                             len - baselen,
3530                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3531                                             (u8 *) &noa, sizeof(noa));
3532                 if (ret >= 2) {
3533                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3534                                 /* valid noa_attr and index changed */
3535                                 sdata->u.mgd.p2p_noa_index = noa.index;
3536                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3537                                 changed |= BSS_CHANGED_P2P_PS;
3538                                 /*
3539                                  * make sure we update all information, the CRC
3540                                  * mechanism doesn't look at P2P attributes.
3541                                  */
3542                                 ifmgd->beacon_crc_valid = false;
3543                         }
3544                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3545                         /* noa_attr not found and we had valid noa_attr before */
3546                         sdata->u.mgd.p2p_noa_index = -1;
3547                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3548                         changed |= BSS_CHANGED_P2P_PS;
3549                         ifmgd->beacon_crc_valid = false;
3550                 }
3551         }
3552
3553         if (ifmgd->csa_waiting_bcn)
3554                 ieee80211_chswitch_post_beacon(sdata);
3555
3556         /*
3557          * Update beacon timing and dtim count on every beacon appearance. This
3558          * will allow the driver to use the most updated values. Do it before
3559          * comparing this one with last received beacon.
3560          * IMPORTANT: These parameters would possibly be out of sync by the time
3561          * the driver will use them. The synchronized view is currently
3562          * guaranteed only in certain callbacks.
3563          */
3564         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3565                 sdata->vif.bss_conf.sync_tsf =
3566                         le64_to_cpu(mgmt->u.beacon.timestamp);
3567                 sdata->vif.bss_conf.sync_device_ts =
3568                         rx_status->device_timestamp;
3569                 if (elems.tim)
3570                         sdata->vif.bss_conf.sync_dtim_count =
3571                                 elems.tim->dtim_count;
3572                 else
3573                         sdata->vif.bss_conf.sync_dtim_count = 0;
3574         }
3575
3576         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3577                 return;
3578         ifmgd->beacon_crc = ncrc;
3579         ifmgd->beacon_crc_valid = true;
3580
3581         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3582
3583         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3584                                          rx_status->device_timestamp,
3585                                          &elems, true);
3586
3587         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3588             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3589                                      elems.wmm_param_len))
3590                 changed |= BSS_CHANGED_QOS;
3591
3592         /*
3593          * If we haven't had a beacon before, tell the driver about the
3594          * DTIM period (and beacon timing if desired) now.
3595          */
3596         if (!ifmgd->have_beacon) {
3597                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3598                 if (elems.tim)
3599                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3600                 else
3601                         bss_conf->dtim_period = 1;
3602
3603                 changed |= BSS_CHANGED_BEACON_INFO;
3604                 ifmgd->have_beacon = true;
3605
3606                 mutex_lock(&local->iflist_mtx);
3607                 ieee80211_recalc_ps(local);
3608                 mutex_unlock(&local->iflist_mtx);
3609
3610                 ieee80211_recalc_ps_vif(sdata);
3611         }
3612
3613         if (elems.erp_info) {
3614                 erp_valid = true;
3615                 erp_value = elems.erp_info[0];
3616         } else {
3617                 erp_valid = false;
3618         }
3619         changed |= ieee80211_handle_bss_capability(sdata,
3620                         le16_to_cpu(mgmt->u.beacon.capab_info),
3621                         erp_valid, erp_value);
3622
3623         mutex_lock(&local->sta_mtx);
3624         sta = sta_info_get(sdata, bssid);
3625
3626         if (ieee80211_config_bw(sdata, sta,
3627                                 elems.ht_cap_elem, elems.ht_operation,
3628                                 elems.vht_operation, bssid, &changed)) {
3629                 mutex_unlock(&local->sta_mtx);
3630                 sdata_info(sdata,
3631                            "failed to follow AP %pM bandwidth change, disconnect\n",
3632                            bssid);
3633                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3634                                        WLAN_REASON_DEAUTH_LEAVING,
3635                                        true, deauth_buf);
3636                 ieee80211_report_disconnect(sdata, deauth_buf,
3637                                             sizeof(deauth_buf), true,
3638                                             WLAN_REASON_DEAUTH_LEAVING);
3639                 return;
3640         }
3641
3642         if (sta && elems.opmode_notif)
3643                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3644                                             rx_status->band);
3645         mutex_unlock(&local->sta_mtx);
3646
3647         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3648                                                elems.country_elem,
3649                                                elems.country_elem_len,
3650                                                elems.pwr_constr_elem,
3651                                                elems.cisco_dtpc_elem);
3652
3653         ieee80211_bss_info_change_notify(sdata, changed);
3654 }
3655
3656 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3657                                   struct sk_buff *skb)
3658 {
3659         struct ieee80211_rx_status *rx_status;
3660         struct ieee80211_mgmt *mgmt;
3661         u16 fc;
3662         struct ieee802_11_elems elems;
3663         int ies_len;
3664
3665         rx_status = (struct ieee80211_rx_status *) skb->cb;
3666         mgmt = (struct ieee80211_mgmt *) skb->data;
3667         fc = le16_to_cpu(mgmt->frame_control);
3668
3669         sdata_lock(sdata);
3670
3671         switch (fc & IEEE80211_FCTL_STYPE) {
3672         case IEEE80211_STYPE_BEACON:
3673                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3674                 break;
3675         case IEEE80211_STYPE_PROBE_RESP:
3676                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3677                 break;
3678         case IEEE80211_STYPE_AUTH:
3679                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3680                 break;
3681         case IEEE80211_STYPE_DEAUTH:
3682                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3683                 break;
3684         case IEEE80211_STYPE_DISASSOC:
3685                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3686                 break;
3687         case IEEE80211_STYPE_ASSOC_RESP:
3688         case IEEE80211_STYPE_REASSOC_RESP:
3689                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3690                 break;
3691         case IEEE80211_STYPE_ACTION:
3692                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3693                         ies_len = skb->len -
3694                                   offsetof(struct ieee80211_mgmt,
3695                                            u.action.u.chan_switch.variable);
3696
3697                         if (ies_len < 0)
3698                                 break;
3699
3700                         ieee802_11_parse_elems(
3701                                 mgmt->u.action.u.chan_switch.variable,
3702                                 ies_len, true, &elems);
3703
3704                         if (elems.parse_error)
3705                                 break;
3706
3707                         ieee80211_sta_process_chanswitch(sdata,
3708                                                  rx_status->mactime,
3709                                                  rx_status->device_timestamp,
3710                                                  &elems, false);
3711                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3712                         ies_len = skb->len -
3713                                   offsetof(struct ieee80211_mgmt,
3714                                            u.action.u.ext_chan_switch.variable);
3715
3716                         if (ies_len < 0)
3717                                 break;
3718
3719                         ieee802_11_parse_elems(
3720                                 mgmt->u.action.u.ext_chan_switch.variable,
3721                                 ies_len, true, &elems);
3722
3723                         if (elems.parse_error)
3724                                 break;
3725
3726                         /* for the handling code pretend this was also an IE */
3727                         elems.ext_chansw_ie =
3728                                 &mgmt->u.action.u.ext_chan_switch.data;
3729
3730                         ieee80211_sta_process_chanswitch(sdata,
3731                                                  rx_status->mactime,
3732                                                  rx_status->device_timestamp,
3733                                                  &elems, false);
3734                 }
3735                 break;
3736         }
3737         sdata_unlock(sdata);
3738 }
3739
3740 static void ieee80211_sta_timer(unsigned long data)
3741 {
3742         struct ieee80211_sub_if_data *sdata =
3743                 (struct ieee80211_sub_if_data *) data;
3744
3745         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3746 }
3747
3748 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3749                                           u8 *bssid, u8 reason, bool tx)
3750 {
3751         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3752
3753         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3754                                tx, frame_buf);
3755
3756         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3757                                     reason);
3758 }
3759
3760 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3761 {
3762         struct ieee80211_local *local = sdata->local;
3763         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3764         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3765         u32 tx_flags = 0;
3766         u16 trans = 1;
3767         u16 status = 0;
3768
3769         sdata_assert_lock(sdata);
3770
3771         if (WARN_ON_ONCE(!auth_data))
3772                 return -EINVAL;
3773
3774         auth_data->tries++;
3775
3776         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3777                 sdata_info(sdata, "authentication with %pM timed out\n",
3778                            auth_data->bss->bssid);
3779
3780                 /*
3781                  * Most likely AP is not in the range so remove the
3782                  * bss struct for that AP.
3783                  */
3784                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3785
3786                 return -ETIMEDOUT;
3787         }
3788
3789         drv_mgd_prepare_tx(local, sdata);
3790
3791         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3792                    auth_data->bss->bssid, auth_data->tries,
3793                    IEEE80211_AUTH_MAX_TRIES);
3794
3795         auth_data->expected_transaction = 2;
3796
3797         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3798                 trans = auth_data->sae_trans;
3799                 status = auth_data->sae_status;
3800                 auth_data->expected_transaction = trans;
3801         }
3802
3803         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3804                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3805                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3806
3807         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3808                             auth_data->data, auth_data->data_len,
3809                             auth_data->bss->bssid,
3810                             auth_data->bss->bssid, NULL, 0, 0,
3811                             tx_flags);
3812
3813         if (tx_flags == 0) {
3814                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3815                 auth_data->timeout_started = true;
3816                 run_again(sdata, auth_data->timeout);
3817         } else {
3818                 auth_data->timeout =
3819                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3820                 auth_data->timeout_started = true;
3821                 run_again(sdata, auth_data->timeout);
3822         }
3823
3824         return 0;
3825 }
3826
3827 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3828 {
3829         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3830         struct ieee80211_local *local = sdata->local;
3831
3832         sdata_assert_lock(sdata);
3833
3834         assoc_data->tries++;
3835         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3836                 sdata_info(sdata, "association with %pM timed out\n",
3837                            assoc_data->bss->bssid);
3838
3839                 /*
3840                  * Most likely AP is not in the range so remove the
3841                  * bss struct for that AP.
3842                  */
3843                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3844
3845                 return -ETIMEDOUT;
3846         }
3847
3848         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3849                    assoc_data->bss->bssid, assoc_data->tries,
3850                    IEEE80211_ASSOC_MAX_TRIES);
3851         ieee80211_send_assoc(sdata);
3852
3853         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3854                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3855                 assoc_data->timeout_started = true;
3856                 run_again(sdata, assoc_data->timeout);
3857         } else {
3858                 assoc_data->timeout =
3859                         round_jiffies_up(jiffies +
3860                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3861                 assoc_data->timeout_started = true;
3862                 run_again(sdata, assoc_data->timeout);
3863         }
3864
3865         return 0;
3866 }
3867
3868 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3869                                   __le16 fc, bool acked)
3870 {
3871         struct ieee80211_local *local = sdata->local;
3872
3873         sdata->u.mgd.status_fc = fc;
3874         sdata->u.mgd.status_acked = acked;
3875         sdata->u.mgd.status_received = true;
3876
3877         ieee80211_queue_work(&local->hw, &sdata->work);
3878 }
3879
3880 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3881 {
3882         struct ieee80211_local *local = sdata->local;
3883         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3884
3885         sdata_lock(sdata);
3886
3887         if (ifmgd->status_received) {
3888                 __le16 fc = ifmgd->status_fc;
3889                 bool status_acked = ifmgd->status_acked;
3890
3891                 ifmgd->status_received = false;
3892                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3893                         if (status_acked) {
3894                                 ifmgd->auth_data->timeout =
3895                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3896                                 run_again(sdata, ifmgd->auth_data->timeout);
3897                         } else {
3898                                 ifmgd->auth_data->timeout = jiffies - 1;
3899                         }
3900                         ifmgd->auth_data->timeout_started = true;
3901                 } else if (ifmgd->assoc_data &&
3902                            (ieee80211_is_assoc_req(fc) ||
3903                             ieee80211_is_reassoc_req(fc))) {
3904                         if (status_acked) {
3905                                 ifmgd->assoc_data->timeout =
3906                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3907                                 run_again(sdata, ifmgd->assoc_data->timeout);
3908                         } else {
3909                                 ifmgd->assoc_data->timeout = jiffies - 1;
3910                         }
3911                         ifmgd->assoc_data->timeout_started = true;
3912                 }
3913         }
3914
3915         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3916             time_after(jiffies, ifmgd->auth_data->timeout)) {
3917                 if (ifmgd->auth_data->done) {
3918                         /*
3919                          * ok ... we waited for assoc but userspace didn't,
3920                          * so let's just kill the auth data
3921                          */
3922                         ieee80211_destroy_auth_data(sdata, false);
3923                 } else if (ieee80211_auth(sdata)) {
3924                         u8 bssid[ETH_ALEN];
3925                         struct ieee80211_event event = {
3926                                 .type = MLME_EVENT,
3927                                 .u.mlme.data = AUTH_EVENT,
3928                                 .u.mlme.status = MLME_TIMEOUT,
3929                         };
3930
3931                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3932
3933                         ieee80211_destroy_auth_data(sdata, false);
3934
3935                         cfg80211_auth_timeout(sdata->dev, bssid);
3936                         drv_event_callback(sdata->local, sdata, &event);
3937                 }
3938         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3939                 run_again(sdata, ifmgd->auth_data->timeout);
3940
3941         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3942             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3943                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3944                     ieee80211_do_assoc(sdata)) {
3945                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3946                         struct ieee80211_event event = {
3947                                 .type = MLME_EVENT,
3948                                 .u.mlme.data = ASSOC_EVENT,
3949                                 .u.mlme.status = MLME_TIMEOUT,
3950                         };
3951
3952                         ieee80211_destroy_assoc_data(sdata, false, false);
3953                         cfg80211_assoc_timeout(sdata->dev, bss);
3954                         drv_event_callback(sdata->local, sdata, &event);
3955                 }
3956         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3957                 run_again(sdata, ifmgd->assoc_data->timeout);
3958
3959         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3960             ifmgd->associated) {
3961                 u8 bssid[ETH_ALEN];
3962                 int max_tries;
3963
3964                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3965
3966                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3967                         max_tries = max_nullfunc_tries;
3968                 else
3969                         max_tries = max_probe_tries;
3970
3971                 /* ACK received for nullfunc probing frame */
3972                 if (!ifmgd->probe_send_count)
3973                         ieee80211_reset_ap_probe(sdata);
3974                 else if (ifmgd->nullfunc_failed) {
3975                         if (ifmgd->probe_send_count < max_tries) {
3976                                 mlme_dbg(sdata,
3977                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3978                                          bssid, ifmgd->probe_send_count,
3979                                          max_tries);
3980                                 ieee80211_mgd_probe_ap_send(sdata);
3981                         } else {
3982                                 mlme_dbg(sdata,
3983                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3984                                          bssid);
3985                                 ieee80211_sta_connection_lost(sdata, bssid,
3986                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3987                                         false);
3988                         }
3989                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3990                         run_again(sdata, ifmgd->probe_timeout);
3991                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3992                         mlme_dbg(sdata,
3993                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3994                                  bssid, probe_wait_ms);
3995                         ieee80211_sta_connection_lost(sdata, bssid,
3996                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3997                 } else if (ifmgd->probe_send_count < max_tries) {
3998                         mlme_dbg(sdata,
3999                                  "No probe response from AP %pM after %dms, try %d/%i\n",
4000                                  bssid, probe_wait_ms,
4001                                  ifmgd->probe_send_count, max_tries);
4002                         ieee80211_mgd_probe_ap_send(sdata);
4003                 } else {
4004                         /*
4005                          * We actually lost the connection ... or did we?
4006                          * Let's make sure!
4007                          */
4008                         mlme_dbg(sdata,
4009                                  "No probe response from AP %pM after %dms, disconnecting.\n",
4010                                  bssid, probe_wait_ms);
4011
4012                         ieee80211_sta_connection_lost(sdata, bssid,
4013                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4014                 }
4015         }
4016
4017         sdata_unlock(sdata);
4018 }
4019
4020 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
4021 {
4022         struct ieee80211_sub_if_data *sdata =
4023                 (struct ieee80211_sub_if_data *) data;
4024         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4025
4026         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4027                 return;
4028
4029         sdata->u.mgd.connection_loss = false;
4030         ieee80211_queue_work(&sdata->local->hw,
4031                              &sdata->u.mgd.beacon_connection_loss_work);
4032 }
4033
4034 static void ieee80211_sta_conn_mon_timer(unsigned long data)
4035 {
4036         struct ieee80211_sub_if_data *sdata =
4037                 (struct ieee80211_sub_if_data *) data;
4038         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4039         struct ieee80211_local *local = sdata->local;
4040
4041         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4042                 return;
4043
4044         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4045 }
4046
4047 static void ieee80211_sta_monitor_work(struct work_struct *work)
4048 {
4049         struct ieee80211_sub_if_data *sdata =
4050                 container_of(work, struct ieee80211_sub_if_data,
4051                              u.mgd.monitor_work);
4052
4053         ieee80211_mgd_probe_ap(sdata, false);
4054 }
4055
4056 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4057 {
4058         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4059                 __ieee80211_stop_poll(sdata);
4060
4061                 /* let's probe the connection once */
4062                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4063                         ieee80211_queue_work(&sdata->local->hw,
4064                                              &sdata->u.mgd.monitor_work);
4065         }
4066 }
4067
4068 #ifdef CONFIG_PM
4069 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4070 {
4071         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4072         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4073
4074         sdata_lock(sdata);
4075
4076         if (ifmgd->auth_data || ifmgd->assoc_data) {
4077                 const u8 *bssid = ifmgd->auth_data ?
4078                                 ifmgd->auth_data->bss->bssid :
4079                                 ifmgd->assoc_data->bss->bssid;
4080
4081                 /*
4082                  * If we are trying to authenticate / associate while suspending,
4083                  * cfg80211 won't know and won't actually abort those attempts,
4084                  * thus we need to do that ourselves.
4085                  */
4086                 ieee80211_send_deauth_disassoc(sdata, bssid,
4087                                                IEEE80211_STYPE_DEAUTH,
4088                                                WLAN_REASON_DEAUTH_LEAVING,
4089                                                false, frame_buf);
4090                 if (ifmgd->assoc_data)
4091                         ieee80211_destroy_assoc_data(sdata, false, true);
4092                 if (ifmgd->auth_data)
4093                         ieee80211_destroy_auth_data(sdata, false);
4094                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4095                                       IEEE80211_DEAUTH_FRAME_LEN);
4096         }
4097
4098         /* This is a bit of a hack - we should find a better and more generic
4099          * solution to this. Normally when suspending, cfg80211 will in fact
4100          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4101          * auth (not so important) or assoc (this is the problem) process.
4102          *
4103          * As a consequence, it can happen that we are in the process of both
4104          * associating and suspending, and receive an association response
4105          * after cfg80211 has checked if it needs to disconnect, but before
4106          * we actually set the flag to drop incoming frames. This will then
4107          * cause the workqueue flush to process the association response in
4108          * the suspend, resulting in a successful association just before it
4109          * tries to remove the interface from the driver, which now though
4110          * has a channel context assigned ... this results in issues.
4111          *
4112          * To work around this (for now) simply deauth here again if we're
4113          * now connected.
4114          */
4115         if (ifmgd->associated && !sdata->local->wowlan) {
4116                 u8 bssid[ETH_ALEN];
4117                 struct cfg80211_deauth_request req = {
4118                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4119                         .bssid = bssid,
4120                 };
4121
4122                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4123                 ieee80211_mgd_deauth(sdata, &req);
4124         }
4125
4126         sdata_unlock(sdata);
4127 }
4128
4129 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4130 {
4131         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4132
4133         sdata_lock(sdata);
4134         if (!ifmgd->associated) {
4135                 sdata_unlock(sdata);
4136                 return;
4137         }
4138
4139         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4140                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4141                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4142                 ieee80211_sta_connection_lost(sdata,
4143                                               ifmgd->associated->bssid,
4144                                               WLAN_REASON_UNSPECIFIED,
4145                                               true);
4146                 sdata_unlock(sdata);
4147                 return;
4148         }
4149         sdata_unlock(sdata);
4150 }
4151 #endif
4152
4153 /* interface setup */
4154 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4155 {
4156         struct ieee80211_if_managed *ifmgd;
4157
4158         ifmgd = &sdata->u.mgd;
4159         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4160         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4161         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4162                   ieee80211_beacon_connection_loss_work);
4163         INIT_WORK(&ifmgd->csa_connection_drop_work,
4164                   ieee80211_csa_connection_drop_work);
4165         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4166         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4167                           ieee80211_tdls_peer_del_work);
4168         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4169                     (unsigned long) sdata);
4170         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4171                     (unsigned long) sdata);
4172         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4173                     (unsigned long) sdata);
4174         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4175                     (unsigned long) sdata);
4176         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4177                           ieee80211_sta_handle_tspec_ac_params_wk);
4178
4179         ifmgd->flags = 0;
4180         ifmgd->powersave = sdata->wdev.ps;
4181         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4182         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4183         ifmgd->p2p_noa_index = -1;
4184
4185         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4186                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4187         else
4188                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4189
4190         /* Setup TDLS data */
4191         spin_lock_init(&ifmgd->teardown_lock);
4192         ifmgd->teardown_skb = NULL;
4193         ifmgd->orig_teardown_skb = NULL;
4194 }
4195
4196 /* scan finished notification */
4197 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4198 {
4199         struct ieee80211_sub_if_data *sdata;
4200
4201         /* Restart STA timers */
4202         rcu_read_lock();
4203         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4204                 if (ieee80211_sdata_running(sdata))
4205                         ieee80211_restart_sta_timer(sdata);
4206         }
4207         rcu_read_unlock();
4208 }
4209
4210 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4211                                      struct cfg80211_bss *cbss)
4212 {
4213         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4214         const u8 *ht_cap_ie, *vht_cap_ie;
4215         const struct ieee80211_ht_cap *ht_cap;
4216         const struct ieee80211_vht_cap *vht_cap;
4217         u8 chains = 1;
4218
4219         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4220                 return chains;
4221
4222         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4223         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4224                 ht_cap = (void *)(ht_cap_ie + 2);
4225                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4226                 /*
4227                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4228                  *       "Tx Unequal Modulation Supported" fields.
4229                  */
4230         }
4231
4232         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4233                 return chains;
4234
4235         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4236         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4237                 u8 nss;
4238                 u16 tx_mcs_map;
4239
4240                 vht_cap = (void *)(vht_cap_ie + 2);
4241                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4242                 for (nss = 8; nss > 0; nss--) {
4243                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4244                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4245                                 break;
4246                 }
4247                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4248                 chains = max(chains, nss);
4249         }
4250
4251         return chains;
4252 }
4253
4254 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4255                                   struct cfg80211_bss *cbss)
4256 {
4257         struct ieee80211_local *local = sdata->local;
4258         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4259         const struct ieee80211_ht_cap *ht_cap = NULL;
4260         const struct ieee80211_ht_operation *ht_oper = NULL;
4261         const struct ieee80211_vht_operation *vht_oper = NULL;
4262         struct ieee80211_supported_band *sband;
4263         struct cfg80211_chan_def chandef;
4264         int ret;
4265         u32 i;
4266         bool have_80mhz;
4267
4268         sband = local->hw.wiphy->bands[cbss->channel->band];
4269
4270         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4271                           IEEE80211_STA_DISABLE_80P80MHZ |
4272                           IEEE80211_STA_DISABLE_160MHZ);
4273
4274         rcu_read_lock();
4275
4276         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4277             sband->ht_cap.ht_supported) {
4278                 const u8 *ht_oper_ie, *ht_cap_ie;
4279
4280                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4281                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4282                         ht_oper = (void *)(ht_oper_ie + 2);
4283
4284                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4285                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4286                         ht_cap = (void *)(ht_cap_ie + 2);
4287
4288                 if (!ht_cap) {
4289                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4290                         ht_oper = NULL;
4291                 }
4292         }
4293
4294         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4295             sband->vht_cap.vht_supported) {
4296                 const u8 *vht_oper_ie, *vht_cap;
4297
4298                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4299                                                    WLAN_EID_VHT_OPERATION);
4300                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4301                         vht_oper = (void *)(vht_oper_ie + 2);
4302                 if (vht_oper && !ht_oper) {
4303                         vht_oper = NULL;
4304                         sdata_info(sdata,
4305                                    "AP advertised VHT without HT, disabling both\n");
4306                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4307                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4308                 }
4309
4310                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4311                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4312                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4313                         vht_oper = NULL;
4314                 }
4315         }
4316
4317         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4318         have_80mhz = false;
4319         for (i = 0; i < sband->n_channels; i++) {
4320                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4321                                                 IEEE80211_CHAN_NO_80MHZ))
4322                         continue;
4323
4324                 have_80mhz = true;
4325                 break;
4326         }
4327
4328         if (!have_80mhz)
4329                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4330
4331         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4332                                                      cbss->channel,
4333                                                      ht_cap, ht_oper, vht_oper,
4334                                                      &chandef, false);
4335
4336         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4337                                       local->rx_chains);
4338
4339         rcu_read_unlock();
4340
4341         /* will change later if needed */
4342         sdata->smps_mode = IEEE80211_SMPS_OFF;
4343
4344         mutex_lock(&local->mtx);
4345         /*
4346          * If this fails (possibly due to channel context sharing
4347          * on incompatible channels, e.g. 80+80 and 160 sharing the
4348          * same control channel) try to use a smaller bandwidth.
4349          */
4350         ret = ieee80211_vif_use_channel(sdata, &chandef,
4351                                         IEEE80211_CHANCTX_SHARED);
4352
4353         /* don't downgrade for 5 and 10 MHz channels, though. */
4354         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4355             chandef.width == NL80211_CHAN_WIDTH_10)
4356                 goto out;
4357
4358         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4359                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4360                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4361                                                 IEEE80211_CHANCTX_SHARED);
4362         }
4363  out:
4364         mutex_unlock(&local->mtx);
4365         return ret;
4366 }
4367
4368 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4369                                      struct cfg80211_bss *cbss, bool assoc,
4370                                      bool override)
4371 {
4372         struct ieee80211_local *local = sdata->local;
4373         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4374         struct ieee80211_bss *bss = (void *)cbss->priv;
4375         struct sta_info *new_sta = NULL;
4376         struct ieee80211_supported_band *sband;
4377         bool have_sta = false;
4378         int err;
4379
4380         sband = local->hw.wiphy->bands[cbss->channel->band];
4381
4382         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4383                 return -EINVAL;
4384
4385         /* If a reconfig is happening, bail out */
4386         if (local->in_reconfig)
4387                 return -EBUSY;
4388
4389         if (assoc) {
4390                 rcu_read_lock();
4391                 have_sta = sta_info_get(sdata, cbss->bssid);
4392                 rcu_read_unlock();
4393         }
4394
4395         if (!have_sta) {
4396                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4397                 if (!new_sta)
4398                         return -ENOMEM;
4399         }
4400
4401         if (new_sta || override) {
4402                 err = ieee80211_prep_channel(sdata, cbss);
4403                 if (err) {
4404                         if (new_sta)
4405                                 sta_info_free(local, new_sta);
4406                         return -EINVAL;
4407                 }
4408         }
4409
4410         if (new_sta) {
4411                 u32 rates = 0, basic_rates = 0;
4412                 bool have_higher_than_11mbit;
4413                 int min_rate = INT_MAX, min_rate_index = -1;
4414                 struct ieee80211_chanctx_conf *chanctx_conf;
4415                 const struct cfg80211_bss_ies *ies;
4416                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4417                 u32 rate_flags;
4418
4419                 rcu_read_lock();
4420                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4421                 if (WARN_ON(!chanctx_conf)) {
4422                         rcu_read_unlock();
4423                         sta_info_free(local, new_sta);
4424                         return -EINVAL;
4425                 }
4426                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4427                 rcu_read_unlock();
4428
4429                 ieee80211_get_rates(sband, bss->supp_rates,
4430                                     bss->supp_rates_len,
4431                                     &rates, &basic_rates,
4432                                     &have_higher_than_11mbit,
4433                                     &min_rate, &min_rate_index,
4434                                     shift, rate_flags);
4435
4436                 /*
4437                  * This used to be a workaround for basic rates missing
4438                  * in the association response frame. Now that we no
4439                  * longer use the basic rates from there, it probably
4440                  * doesn't happen any more, but keep the workaround so
4441                  * in case some *other* APs are buggy in different ways
4442                  * we can connect -- with a warning.
4443                  */
4444                 if (!basic_rates && min_rate_index >= 0) {
4445                         sdata_info(sdata,
4446                                    "No basic rates, using min rate instead\n");
4447                         basic_rates = BIT(min_rate_index);
4448                 }
4449
4450                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4451                 sdata->vif.bss_conf.basic_rates = basic_rates;
4452
4453                 /* cf. IEEE 802.11 9.2.12 */
4454                 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4455                     have_higher_than_11mbit)
4456                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4457                 else
4458                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4459
4460                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4461
4462                 /* set timing information */
4463                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4464                 rcu_read_lock();
4465                 ies = rcu_dereference(cbss->beacon_ies);
4466                 if (ies) {
4467                         const u8 *tim_ie;
4468
4469                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4470                         sdata->vif.bss_conf.sync_device_ts =
4471                                 bss->device_ts_beacon;
4472                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4473                                                   ies->data, ies->len);
4474                         if (tim_ie && tim_ie[1] >= 2)
4475                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4476                         else
4477                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4478                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4479                                                TIMING_BEACON_ONLY)) {
4480                         ies = rcu_dereference(cbss->proberesp_ies);
4481                         /* must be non-NULL since beacon IEs were NULL */
4482                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4483                         sdata->vif.bss_conf.sync_device_ts =
4484                                 bss->device_ts_presp;
4485                         sdata->vif.bss_conf.sync_dtim_count = 0;
4486                 } else {
4487                         sdata->vif.bss_conf.sync_tsf = 0;
4488                         sdata->vif.bss_conf.sync_device_ts = 0;
4489                         sdata->vif.bss_conf.sync_dtim_count = 0;
4490                 }
4491                 rcu_read_unlock();
4492
4493                 /* tell driver about BSSID, basic rates and timing */
4494                 ieee80211_bss_info_change_notify(sdata,
4495                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4496                         BSS_CHANGED_BEACON_INT);
4497
4498                 if (assoc)
4499                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4500
4501                 err = sta_info_insert(new_sta);
4502                 new_sta = NULL;
4503                 if (err) {
4504                         sdata_info(sdata,
4505                                    "failed to insert STA entry for the AP (error %d)\n",
4506                                    err);
4507                         return err;
4508                 }
4509         } else
4510                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4511
4512         /* Cancel scan to ensure that nothing interferes with connection */
4513         if (local->scanning)
4514                 ieee80211_scan_cancel(local);
4515
4516         return 0;
4517 }
4518
4519 /* config hooks */
4520 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4521                        struct cfg80211_auth_request *req)
4522 {
4523         struct ieee80211_local *local = sdata->local;
4524         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4525         struct ieee80211_mgd_auth_data *auth_data;
4526         u16 auth_alg;
4527         int err;
4528
4529         /* prepare auth data structure */
4530
4531         switch (req->auth_type) {
4532         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4533                 auth_alg = WLAN_AUTH_OPEN;
4534                 break;
4535         case NL80211_AUTHTYPE_SHARED_KEY:
4536                 if (IS_ERR(local->wep_tx_tfm))
4537                         return -EOPNOTSUPP;
4538                 auth_alg = WLAN_AUTH_SHARED_KEY;
4539                 break;
4540         case NL80211_AUTHTYPE_FT:
4541                 auth_alg = WLAN_AUTH_FT;
4542                 break;
4543         case NL80211_AUTHTYPE_NETWORK_EAP:
4544                 auth_alg = WLAN_AUTH_LEAP;
4545                 break;
4546         case NL80211_AUTHTYPE_SAE:
4547                 auth_alg = WLAN_AUTH_SAE;
4548                 break;
4549         case NL80211_AUTHTYPE_FILS_SK:
4550                 auth_alg = WLAN_AUTH_FILS_SK;
4551                 break;
4552         case NL80211_AUTHTYPE_FILS_SK_PFS:
4553                 auth_alg = WLAN_AUTH_FILS_SK_PFS;
4554                 break;
4555         case NL80211_AUTHTYPE_FILS_PK:
4556                 auth_alg = WLAN_AUTH_FILS_PK;
4557                 break;
4558         default:
4559                 return -EOPNOTSUPP;
4560         }
4561
4562         auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4563                             req->ie_len, GFP_KERNEL);
4564         if (!auth_data)
4565                 return -ENOMEM;
4566
4567         auth_data->bss = req->bss;
4568
4569         if (req->auth_data_len >= 4) {
4570                 if (req->auth_type == NL80211_AUTHTYPE_SAE) {
4571                         __le16 *pos = (__le16 *) req->auth_data;
4572
4573                         auth_data->sae_trans = le16_to_cpu(pos[0]);
4574                         auth_data->sae_status = le16_to_cpu(pos[1]);
4575                 }
4576                 memcpy(auth_data->data, req->auth_data + 4,
4577                        req->auth_data_len - 4);
4578                 auth_data->data_len += req->auth_data_len - 4;
4579         }
4580
4581         if (req->ie && req->ie_len) {
4582                 memcpy(&auth_data->data[auth_data->data_len],
4583                        req->ie, req->ie_len);
4584                 auth_data->data_len += req->ie_len;
4585         }
4586
4587         if (req->key && req->key_len) {
4588                 auth_data->key_len = req->key_len;
4589                 auth_data->key_idx = req->key_idx;
4590                 memcpy(auth_data->key, req->key, req->key_len);
4591         }
4592
4593         auth_data->algorithm = auth_alg;
4594
4595         /* try to authenticate/probe */
4596
4597         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4598             ifmgd->assoc_data) {
4599                 err = -EBUSY;
4600                 goto err_free;
4601         }
4602
4603         if (ifmgd->auth_data)
4604                 ieee80211_destroy_auth_data(sdata, false);
4605
4606         /* prep auth_data so we don't go into idle on disassoc */
4607         ifmgd->auth_data = auth_data;
4608
4609         if (ifmgd->associated) {
4610                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4611
4612                 sdata_info(sdata,
4613                            "disconnect from AP %pM for new auth to %pM\n",
4614                            ifmgd->associated->bssid, req->bss->bssid);
4615                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4616                                        WLAN_REASON_UNSPECIFIED,
4617                                        false, frame_buf);
4618
4619                 ieee80211_report_disconnect(sdata, frame_buf,
4620                                             sizeof(frame_buf), true,
4621                                             WLAN_REASON_UNSPECIFIED);
4622         }
4623
4624         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4625
4626         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4627         if (err)
4628                 goto err_clear;
4629
4630         err = ieee80211_auth(sdata);
4631         if (err) {
4632                 sta_info_destroy_addr(sdata, req->bss->bssid);
4633                 goto err_clear;
4634         }
4635
4636         /* hold our own reference */
4637         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4638         return 0;
4639
4640  err_clear:
4641         eth_zero_addr(ifmgd->bssid);
4642         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4643         ifmgd->auth_data = NULL;
4644         mutex_lock(&sdata->local->mtx);
4645         ieee80211_vif_release_channel(sdata);
4646         mutex_unlock(&sdata->local->mtx);
4647  err_free:
4648         kfree(auth_data);
4649         return err;
4650 }
4651
4652 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4653                         struct cfg80211_assoc_request *req)
4654 {
4655         struct ieee80211_local *local = sdata->local;
4656         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4657         struct ieee80211_bss *bss = (void *)req->bss->priv;
4658         struct ieee80211_mgd_assoc_data *assoc_data;
4659         const struct cfg80211_bss_ies *beacon_ies;
4660         struct ieee80211_supported_band *sband;
4661         const u8 *ssidie, *ht_ie, *vht_ie;
4662         int i, err;
4663         bool override = false;
4664
4665         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4666         if (!assoc_data)
4667                 return -ENOMEM;
4668
4669         rcu_read_lock();
4670         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4671         if (!ssidie) {
4672                 rcu_read_unlock();
4673                 kfree(assoc_data);
4674                 return -EINVAL;
4675         }
4676         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4677         assoc_data->ssid_len = ssidie[1];
4678         rcu_read_unlock();
4679
4680         if (ifmgd->associated) {
4681                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4682
4683                 sdata_info(sdata,
4684                            "disconnect from AP %pM for new assoc to %pM\n",
4685                            ifmgd->associated->bssid, req->bss->bssid);
4686                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4687                                        WLAN_REASON_UNSPECIFIED,
4688                                        false, frame_buf);
4689
4690                 ieee80211_report_disconnect(sdata, frame_buf,
4691                                             sizeof(frame_buf), true,
4692                                             WLAN_REASON_UNSPECIFIED);
4693         }
4694
4695         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4696                 err = -EBUSY;
4697                 goto err_free;
4698         }
4699
4700         if (ifmgd->assoc_data) {
4701                 err = -EBUSY;
4702                 goto err_free;
4703         }
4704
4705         if (ifmgd->auth_data) {
4706                 bool match;
4707
4708                 /* keep sta info, bssid if matching */
4709                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4710                 ieee80211_destroy_auth_data(sdata, match);
4711         }
4712
4713         /* prepare assoc data */
4714
4715         ifmgd->beacon_crc_valid = false;
4716
4717         assoc_data->wmm = bss->wmm_used &&
4718                           (local->hw.queues >= IEEE80211_NUM_ACS);
4719
4720         /*
4721          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4722          * We still associate in non-HT mode (11a/b/g) if any one of these
4723          * ciphers is configured as pairwise.
4724          * We can set this to true for non-11n hardware, that'll be checked
4725          * separately along with the peer capabilities.
4726          */
4727         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4728                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4729                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4730                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4731                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4732                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4733                         netdev_info(sdata->dev,
4734                                     "disabling HT/VHT due to WEP/TKIP use\n");
4735                 }
4736         }
4737
4738         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4739         sband = local->hw.wiphy->bands[req->bss->channel->band];
4740         if (!sband->ht_cap.ht_supported ||
4741             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4742             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4743                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4744                 if (!bss->wmm_used &&
4745                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4746                         netdev_info(sdata->dev,
4747                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4748         }
4749
4750         /* disable VHT if we don't support it or the AP doesn't use WMM */
4751         if (!sband->vht_cap.vht_supported ||
4752             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4753             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4754                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4755                 if (!bss->wmm_used &&
4756                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4757                         netdev_info(sdata->dev,
4758                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4759         }
4760
4761         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4762         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4763                sizeof(ifmgd->ht_capa_mask));
4764
4765         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4766         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4767                sizeof(ifmgd->vht_capa_mask));
4768
4769         if (req->ie && req->ie_len) {
4770                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4771                 assoc_data->ie_len = req->ie_len;
4772         }
4773
4774         if (req->fils_kek) {
4775                 /* should already be checked in cfg80211 - so warn */
4776                 if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) {
4777                         err = -EINVAL;
4778                         goto err_free;
4779                 }
4780                 memcpy(assoc_data->fils_kek, req->fils_kek,
4781                        req->fils_kek_len);
4782                 assoc_data->fils_kek_len = req->fils_kek_len;
4783         }
4784
4785         if (req->fils_nonces)
4786                 memcpy(assoc_data->fils_nonces, req->fils_nonces,
4787                        2 * FILS_NONCE_LEN);
4788
4789         assoc_data->bss = req->bss;
4790
4791         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4792                 if (ifmgd->powersave)
4793                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4794                 else
4795                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4796         } else
4797                 sdata->smps_mode = ifmgd->req_smps;
4798
4799         assoc_data->capability = req->bss->capability;
4800         assoc_data->supp_rates = bss->supp_rates;
4801         assoc_data->supp_rates_len = bss->supp_rates_len;
4802
4803         rcu_read_lock();
4804         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4805         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4806                 assoc_data->ap_ht_param =
4807                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4808         else
4809                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4810         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4811         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4812                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4813                        sizeof(struct ieee80211_vht_cap));
4814         else
4815                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4816         rcu_read_unlock();
4817
4818         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4819                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4820              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4821                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4822
4823         if (bss->wmm_used && bss->uapsd_supported &&
4824             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4825                 assoc_data->uapsd = true;
4826                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4827         } else {
4828                 assoc_data->uapsd = false;
4829                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4830         }
4831
4832         if (req->prev_bssid)
4833                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4834
4835         if (req->use_mfp) {
4836                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4837                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4838         } else {
4839                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4840                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4841         }
4842
4843         if (req->flags & ASSOC_REQ_USE_RRM)
4844                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4845         else
4846                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4847
4848         if (req->crypto.control_port)
4849                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4850         else
4851                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4852
4853         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4854         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4855         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4856                                                         sdata->vif.type);
4857
4858         /* kick off associate process */
4859
4860         ifmgd->assoc_data = assoc_data;
4861         ifmgd->dtim_period = 0;
4862         ifmgd->have_beacon = false;
4863
4864         /* override HT/VHT configuration only if the AP and we support it */
4865         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4866                 struct ieee80211_sta_ht_cap sta_ht_cap;
4867
4868                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4869                         override = true;
4870
4871                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4872                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4873
4874                 /* check for 40 MHz disable override */
4875                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4876                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4877                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4878                         override = true;
4879
4880                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4881                     req->flags & ASSOC_REQ_DISABLE_VHT)
4882                         override = true;
4883         }
4884
4885         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4886                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4887                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4888         }
4889
4890         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4891                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4892
4893         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4894         if (err)
4895                 goto err_clear;
4896
4897         rcu_read_lock();
4898         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4899
4900         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4901             !beacon_ies) {
4902                 /*
4903                  * Wait up to one beacon interval ...
4904                  * should this be more if we miss one?
4905                  */
4906                 sdata_info(sdata, "waiting for beacon from %pM\n",
4907                            ifmgd->bssid);
4908                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4909                 assoc_data->timeout_started = true;
4910                 assoc_data->need_beacon = true;
4911         } else if (beacon_ies) {
4912                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4913                                                     beacon_ies->data,
4914                                                     beacon_ies->len);
4915                 u8 dtim_count = 0;
4916
4917                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4918                         const struct ieee80211_tim_ie *tim;
4919                         tim = (void *)(tim_ie + 2);
4920                         ifmgd->dtim_period = tim->dtim_period;
4921                         dtim_count = tim->dtim_count;
4922                 }
4923                 ifmgd->have_beacon = true;
4924                 assoc_data->timeout = jiffies;
4925                 assoc_data->timeout_started = true;
4926
4927                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4928                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4929                         sdata->vif.bss_conf.sync_device_ts =
4930                                 bss->device_ts_beacon;
4931                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4932                 }
4933         } else {
4934                 assoc_data->timeout = jiffies;
4935                 assoc_data->timeout_started = true;
4936         }
4937         rcu_read_unlock();
4938
4939         run_again(sdata, assoc_data->timeout);
4940
4941         if (bss->corrupt_data) {
4942                 char *corrupt_type = "data";
4943                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4944                         if (bss->corrupt_data &
4945                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4946                                 corrupt_type = "beacon and probe response";
4947                         else
4948                                 corrupt_type = "beacon";
4949                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4950                         corrupt_type = "probe response";
4951                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4952                            corrupt_type);
4953         }
4954
4955         return 0;
4956  err_clear:
4957         eth_zero_addr(ifmgd->bssid);
4958         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4959         ifmgd->assoc_data = NULL;
4960  err_free:
4961         kfree(assoc_data);
4962         return err;
4963 }
4964
4965 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4966                          struct cfg80211_deauth_request *req)
4967 {
4968         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4969         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4970         bool tx = !req->local_state_change;
4971
4972         if (ifmgd->auth_data &&
4973             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4974                 sdata_info(sdata,
4975                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4976                            req->bssid, req->reason_code,
4977                            ieee80211_get_reason_code_string(req->reason_code));
4978
4979                 drv_mgd_prepare_tx(sdata->local, sdata);
4980                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4981                                                IEEE80211_STYPE_DEAUTH,
4982                                                req->reason_code, tx,
4983                                                frame_buf);
4984                 ieee80211_destroy_auth_data(sdata, false);
4985                 ieee80211_report_disconnect(sdata, frame_buf,
4986                                             sizeof(frame_buf), true,
4987                                             req->reason_code);
4988
4989                 return 0;
4990         }
4991
4992         if (ifmgd->assoc_data &&
4993             ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4994                 sdata_info(sdata,
4995                            "aborting association with %pM by local choice (Reason: %u=%s)\n",
4996                            req->bssid, req->reason_code,
4997                            ieee80211_get_reason_code_string(req->reason_code));
4998
4999                 drv_mgd_prepare_tx(sdata->local, sdata);
5000                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
5001                                                IEEE80211_STYPE_DEAUTH,
5002                                                req->reason_code, tx,
5003                                                frame_buf);
5004                 ieee80211_destroy_assoc_data(sdata, false, true);
5005                 ieee80211_report_disconnect(sdata, frame_buf,
5006                                             sizeof(frame_buf), true,
5007                                             req->reason_code);
5008                 return 0;
5009         }
5010
5011         if (ifmgd->associated &&
5012             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5013                 sdata_info(sdata,
5014                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
5015                            req->bssid, req->reason_code,
5016                            ieee80211_get_reason_code_string(req->reason_code));
5017
5018                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5019                                        req->reason_code, tx, frame_buf);
5020                 ieee80211_report_disconnect(sdata, frame_buf,
5021                                             sizeof(frame_buf), true,
5022                                             req->reason_code);
5023                 return 0;
5024         }
5025
5026         return -ENOTCONN;
5027 }
5028
5029 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5030                            struct cfg80211_disassoc_request *req)
5031 {
5032         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5033         u8 bssid[ETH_ALEN];
5034         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5035
5036         /*
5037          * cfg80211 should catch this ... but it's racy since
5038          * we can receive a disassoc frame, process it, hand it
5039          * to cfg80211 while that's in a locked section already
5040          * trying to tell us that the user wants to disconnect.
5041          */
5042         if (ifmgd->associated != req->bss)
5043                 return -ENOLINK;
5044
5045         sdata_info(sdata,
5046                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
5047                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5048
5049         memcpy(bssid, req->bss->bssid, ETH_ALEN);
5050         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5051                                req->reason_code, !req->local_state_change,
5052                                frame_buf);
5053
5054         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5055                                     req->reason_code);
5056
5057         return 0;
5058 }
5059
5060 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5061 {
5062         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5063
5064         /*
5065          * Make sure some work items will not run after this,
5066          * they will not do anything but might not have been
5067          * cancelled when disconnecting.
5068          */
5069         cancel_work_sync(&ifmgd->monitor_work);
5070         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5071         cancel_work_sync(&ifmgd->request_smps_work);
5072         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5073         cancel_work_sync(&ifmgd->chswitch_work);
5074         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5075
5076         sdata_lock(sdata);
5077         if (ifmgd->assoc_data) {
5078                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5079                 ieee80211_destroy_assoc_data(sdata, false, false);
5080                 cfg80211_assoc_timeout(sdata->dev, bss);
5081         }
5082         if (ifmgd->auth_data)
5083                 ieee80211_destroy_auth_data(sdata, false);
5084         spin_lock_bh(&ifmgd->teardown_lock);
5085         if (ifmgd->teardown_skb) {
5086                 kfree_skb(ifmgd->teardown_skb);
5087                 ifmgd->teardown_skb = NULL;
5088                 ifmgd->orig_teardown_skb = NULL;
5089         }
5090         spin_unlock_bh(&ifmgd->teardown_lock);
5091         del_timer_sync(&ifmgd->timer);
5092         sdata_unlock(sdata);
5093 }
5094
5095 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5096                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5097                                s32 rssi_level,
5098                                gfp_t gfp)
5099 {
5100         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5101
5102         trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level);
5103
5104         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp);
5105 }
5106 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5107
5108 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5109 {
5110         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5111
5112         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5113
5114         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5115 }
5116 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);