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  * Copyright (C) 2018        Intel Corporation
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/delay.h>
  18 #include <linux/if_ether.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/rtnetlink.h>
  24 #include <linux/crc32.h>
  25 #include <linux/slab.h>
  26 #include <linux/export.h>
  27 #include <net/mac80211.h>
  28 #include <asm/unaligned.h>
  29
  30 #include "ieee80211_i.h"
  31 #include "driver-ops.h"
  32 #include "rate.h"
  33 #include "led.h"
  34 #include "fils_aead.h"
  35
  36 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  37 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  38 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  39 #define IEEE80211_AUTH_MAX_TRIES        3
  40 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  41 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  42 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  43 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  44 #define IEEE80211_ASSOC_MAX_TRIES       3
  45
  46 static int max_nullfunc_tries = 2;
  47 module_param(max_nullfunc_tries, int, 0644);
  48 MODULE_PARM_DESC(max_nullfunc_tries,
  49                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  50
  51 static int max_probe_tries = 5;
  52 module_param(max_probe_tries, int, 0644);
  53 MODULE_PARM_DESC(max_probe_tries,
  54                  "Maximum probe tries before disconnecting (reason 4).");
  55
  56 /*
  57  * Beacon loss timeout is calculated as N frames times the
  58  * advertised beacon interval.  This may need to be somewhat
  59  * higher than what hardware might detect to account for
  60  * delays in the host processing frames. But since we also
  61  * probe on beacon miss before declaring the connection lost
  62  * default to what we want.
  63  */
  64 static int beacon_loss_count = 7;
  65 module_param(beacon_loss_count, int, 0644);
  66 MODULE_PARM_DESC(beacon_loss_count,
  67                  "Number of beacon intervals before we decide beacon was lost.");
  68
  69 /*
  70  * Time the connection can be idle before we probe
  71  * it to see if we can still talk to the AP.
  72  */
  73 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  74 /*
  75  * Time we wait for a probe response after sending
  76  * a probe request because of beacon loss or for
  77  * checking the connection still works.
  78  */
  79 static int probe_wait_ms = 500;
  80 module_param(probe_wait_ms, int, 0644);
  81 MODULE_PARM_DESC(probe_wait_ms,
  82                  "Maximum time(ms) to wait for probe response"
  83                  " before disconnecting (reason 4).");
  84
  85 /*
  86  * How many Beacon frames need to have been used in average signal strength
  87  * before starting to indicate signal change events.
  88  */
  89 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  90
  91 /*
  92  * We can have multiple work items (and connection probing)
  93  * scheduling this timer, but we need to take care to only
  94  * reschedule it when it should fire _earlier_ than it was
  95  * asked for before, or if it's not pending right now. This
  96  * function ensures that. Note that it then is required to
  97  * run this function for all timeouts after the first one
  98  * has happened -- the work that runs from this timer will
  99  * do that.
 100  */
 101 static void run_again(struct ieee80211_sub_if_data *sdata,
 102                       unsigned long timeout)
 103 {
 104         sdata_assert_lock(sdata);
 105
 106         if (!timer_pending(&sdata->u.mgd.timer) ||
 107             time_before(timeout, sdata->u.mgd.timer.expires))
 108                 mod_timer(&sdata->u.mgd.timer, timeout);
 109 }
 110
 111 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 112 {
 113         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 114                 return;
 115
 116         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 117                 return;
 118
 119         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 120                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 121 }
 122
 123 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 124 {
 125         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 126
 127         if (unlikely(!ifmgd->associated))
 128                 return;
 129
 130         if (ifmgd->probe_send_count)
 131                 ifmgd->probe_send_count = 0;
 132
 133         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 134                 return;
 135
 136         mod_timer(&ifmgd->conn_mon_timer,
 137                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 138 }
 139
 140 static int ecw2cw(int ecw)
 141 {
 142         return (1 << ecw) - 1;
 143 }
 144
 145 static u32
 146 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 147                              struct ieee80211_supported_band *sband,
 148                              struct ieee80211_channel *channel,
 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_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         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 174                                                   channel->band);
 175         /* check that channel matches the right operating channel */
 176         if (!tracking && channel->center_freq != ht_cfreq) {
 177                 /*
 178                  * It's possible that some APs are confused here;
 179                  * Netgear WNDR3700 sometimes reports 4 higher than
 180                  * the actual channel in association responses, but
 181                  * since we look at probe response/beacon data here
 182                  * it should be OK.
 183                  */
 184                 sdata_info(sdata,
 185                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 186                            channel->center_freq, ht_cfreq,
 187                            ht_oper->primary_chan, channel->band);
 188                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 189                 goto out;
 190         }
 191
 192         /* check 40 MHz support, if we have it */
 193         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 194                 ieee80211_chandef_ht_oper(ht_oper, chandef);
 195         } else {
 196                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 197                 ret = IEEE80211_STA_DISABLE_VHT;
 198                 /* also mark 40 MHz disabled */
 199                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 200                 goto out;
 201         }
 202
 203         if (!vht_oper || !sband->vht_cap.vht_supported) {
 204                 ret = IEEE80211_STA_DISABLE_VHT;
 205                 goto out;
 206         }
 207
 208         vht_chandef = *chandef;
 209         if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
 210                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 211                         sdata_info(sdata,
 212                                    "AP VHT information is invalid, disable VHT\n");
 213                 ret = IEEE80211_STA_DISABLE_VHT;
 214                 goto out;
 215         }
 216
 217         if (!cfg80211_chandef_valid(&vht_chandef)) {
 218                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 219                         sdata_info(sdata,
 220                                    "AP VHT information is invalid, disable VHT\n");
 221                 ret = IEEE80211_STA_DISABLE_VHT;
 222                 goto out;
 223         }
 224
 225         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 226                 ret = 0;
 227                 goto out;
 228         }
 229
 230         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 231                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 232                         sdata_info(sdata,
 233                                    "AP VHT information doesn't match HT, disable VHT\n");
 234                 ret = IEEE80211_STA_DISABLE_VHT;
 235                 goto out;
 236         }
 237
 238         *chandef = vht_chandef;
 239
 240         ret = 0;
 241
 242 out:
 243         /*
 244          * When tracking the current AP, don't do any further checks if the
 245          * new chandef is identical to the one we're currently using for the
 246          * connection. This keeps us from playing ping-pong with regulatory,
 247          * without it the following can happen (for example):
 248          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 249          *  - AP advertises regdom US
 250          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 251          *  - the code below detects an unsupported channel, downgrades, and
 252          *    we disconnect from the AP in the caller
 253          *  - disconnect causes CRDA to reload world regdomain and the game
 254          *    starts anew.
 255          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 256          *
 257          * It seems possible that there are still scenarios with CSA or real
 258          * bandwidth changes where a this could happen, but those cases are
 259          * less common and wouldn't completely prevent using the AP.
 260          */
 261         if (tracking &&
 262             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 263                 return ret;
 264
 265         /* don't print the message below for VHT mismatch if VHT is disabled */
 266         if (ret & IEEE80211_STA_DISABLE_VHT)
 267                 vht_chandef = *chandef;
 268
 269         /*
 270          * Ignore the DISABLED flag when we're already connected and only
 271          * tracking the APs beacon for bandwidth changes - otherwise we
 272          * might get disconnected here if we connect to an AP, update our
 273          * regulatory information based on the AP's country IE and the
 274          * information we have is wrong/outdated and disables the channel
 275          * that we're actually using for the connection to the AP.
 276          */
 277         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 278                                         tracking ? 0 :
 279                                                    IEEE80211_CHAN_DISABLED)) {
 280                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 281                         ret = IEEE80211_STA_DISABLE_HT |
 282                               IEEE80211_STA_DISABLE_VHT;
 283                         break;
 284                 }
 285
 286                 ret |= ieee80211_chandef_downgrade(chandef);
 287         }
 288
 289         if (chandef->width != vht_chandef.width && !tracking)
 290                 sdata_info(sdata,
 291                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 292
 293         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 294         return ret;
 295 }
 296
 297 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 298                                struct sta_info *sta,
 299                                const struct ieee80211_ht_cap *ht_cap,
 300                                const struct ieee80211_ht_operation *ht_oper,
 301                                const struct ieee80211_vht_operation *vht_oper,
 302                                const u8 *bssid, u32 *changed)
 303 {
 304         struct ieee80211_local *local = sdata->local;
 305         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 306         struct ieee80211_supported_band *sband;
 307         struct ieee80211_channel *chan;
 308         struct cfg80211_chan_def chandef;
 309         u16 ht_opmode;
 310         u32 flags;
 311         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 312         int ret;
 313
 314         /* if HT was/is disabled, don't track any bandwidth changes */
 315         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 316                 return 0;
 317
 318         /* don't check VHT if we associated as non-VHT station */
 319         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 320                 vht_oper = NULL;
 321
 322         if (WARN_ON_ONCE(!sta))
 323                 return -EINVAL;
 324
 325         /*
 326          * if bss configuration changed store the new one -
 327          * this may be applicable even if channel is identical
 328          */
 329         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 330         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 331                 *changed |= BSS_CHANGED_HT;
 332                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 333         }
 334
 335         chan = sdata->vif.bss_conf.chandef.chan;
 336         sband = local->hw.wiphy->bands[chan->band];
 337
 338         /* calculate new channel (type) based on HT/VHT operation IEs */
 339         flags = ieee80211_determine_chantype(sdata, sband, chan,
 340                                              ht_oper, vht_oper,
 341                                              &chandef, true);
 342
 343         /*
 344          * Downgrade the new channel if we associated with restricted
 345          * capabilities. For example, if we associated as a 20 MHz STA
 346          * to a 40 MHz AP (due to regulatory, capabilities or config
 347          * reasons) then switching to a 40 MHz channel now won't do us
 348          * any good -- we couldn't use it with the AP.
 349          */
 350         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 351             chandef.width == NL80211_CHAN_WIDTH_80P80)
 352                 flags |= ieee80211_chandef_downgrade(&chandef);
 353         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 354             chandef.width == NL80211_CHAN_WIDTH_160)
 355                 flags |= ieee80211_chandef_downgrade(&chandef);
 356         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 357             chandef.width > NL80211_CHAN_WIDTH_20)
 358                 flags |= ieee80211_chandef_downgrade(&chandef);
 359
 360         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 361                 return 0;
 362
 363         sdata_info(sdata,
 364                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 365                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 366                    chandef.center_freq1, chandef.center_freq2);
 367
 368         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 369                                       IEEE80211_STA_DISABLE_VHT |
 370                                       IEEE80211_STA_DISABLE_40MHZ |
 371                                       IEEE80211_STA_DISABLE_80P80MHZ |
 372                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 373             !cfg80211_chandef_valid(&chandef)) {
 374                 sdata_info(sdata,
 375                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 376                            ifmgd->bssid);
 377                 return -EINVAL;
 378         }
 379
 380         switch (chandef.width) {
 381         case NL80211_CHAN_WIDTH_20_NOHT:
 382         case NL80211_CHAN_WIDTH_20:
 383                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 384                 break;
 385         case NL80211_CHAN_WIDTH_40:
 386                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 387                 break;
 388         case NL80211_CHAN_WIDTH_80:
 389                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 390                 break;
 391         case NL80211_CHAN_WIDTH_80P80:
 392         case NL80211_CHAN_WIDTH_160:
 393                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 394                 break;
 395         default:
 396                 return -EINVAL;
 397         }
 398
 399         if (new_sta_bw > sta->cur_max_bandwidth)
 400                 new_sta_bw = sta->cur_max_bandwidth;
 401
 402         if (new_sta_bw < sta->sta.bandwidth) {
 403                 sta->sta.bandwidth = new_sta_bw;
 404                 rate_control_rate_update(local, sband, sta,
 405                                          IEEE80211_RC_BW_CHANGED);
 406         }
 407
 408         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 409         if (ret) {
 410                 sdata_info(sdata,
 411                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 412                            ifmgd->bssid);
 413                 return ret;
 414         }
 415
 416         if (new_sta_bw > sta->sta.bandwidth) {
 417                 sta->sta.bandwidth = new_sta_bw;
 418                 rate_control_rate_update(local, sband, sta,
 419                                          IEEE80211_RC_BW_CHANGED);
 420         }
 421
 422         return 0;
 423 }
 424
 425 /* frame sending functions */
 426
 427 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 428                                 struct sk_buff *skb, u8 ap_ht_param,
 429                                 struct ieee80211_supported_band *sband,
 430                                 struct ieee80211_channel *channel,
 431                                 enum ieee80211_smps_mode smps)
 432 {
 433         u8 *pos;
 434         u32 flags = channel->flags;
 435         u16 cap;
 436         struct ieee80211_sta_ht_cap ht_cap;
 437
 438         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 439
 440         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 441         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 442
 443         /* determine capability flags */
 444         cap = ht_cap.cap;
 445
 446         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 447         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 448                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 449                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 450                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 451                 }
 452                 break;
 453         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 454                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 455                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 456                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 457                 }
 458                 break;
 459         }
 460
 461         /*
 462          * If 40 MHz was disabled associate as though we weren't
 463          * capable of 40 MHz -- some broken APs will never fall
 464          * back to trying to transmit in 20 MHz.
 465          */
 466         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 467                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 468                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 469         }
 470
 471         /* set SM PS mode properly */
 472         cap &= ~IEEE80211_HT_CAP_SM_PS;
 473         switch (smps) {
 474         case IEEE80211_SMPS_AUTOMATIC:
 475         case IEEE80211_SMPS_NUM_MODES:
 476                 WARN_ON(1);
 477                 /* fall through */
 478         case IEEE80211_SMPS_OFF:
 479                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 480                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 481                 break;
 482         case IEEE80211_SMPS_STATIC:
 483                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 484                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 485                 break;
 486         case IEEE80211_SMPS_DYNAMIC:
 487                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 488                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 489                 break;
 490         }
 491
 492         /* reserve and fill IE */
 493         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 494         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 495 }
 496
 497 /* This function determines vht capability flags for the association
 498  * and builds the IE.
 499  * Note - the function may set the owner of the MU-MIMO capability
 500  */
 501 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 502                                  struct sk_buff *skb,
 503                                  struct ieee80211_supported_band *sband,
 504                                  struct ieee80211_vht_cap *ap_vht_cap)
 505 {
 506         struct ieee80211_local *local = sdata->local;
 507         u8 *pos;
 508         u32 cap;
 509         struct ieee80211_sta_vht_cap vht_cap;
 510         u32 mask, ap_bf_sts, our_bf_sts;
 511
 512         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 513
 514         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 515         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 516
 517         /* determine capability flags */
 518         cap = vht_cap.cap;
 519
 520         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 521                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 522
 523                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 524                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 525                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 526                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 527         }
 528
 529         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 530                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 531                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 532         }
 533
 534         /*
 535          * Some APs apparently get confused if our capabilities are better
 536          * than theirs, so restrict what we advertise in the assoc request.
 537          */
 538         if (!(ap_vht_cap->vht_cap_info &
 539                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 540                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 541                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 542         else if (!(ap_vht_cap->vht_cap_info &
 543                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 544                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 545
 546         /*
 547          * If some other vif is using the MU-MIMO capablity we cannot associate
 548          * using MU-MIMO - this will lead to contradictions in the group-id
 549          * mechanism.
 550          * Ownership is defined since association request, in order to avoid
 551          * simultaneous associations with MU-MIMO.
 552          */
 553         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 554                 bool disable_mu_mimo = false;
 555                 struct ieee80211_sub_if_data *other;
 556
 557                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 558                         if (other->vif.mu_mimo_owner) {
 559                                 disable_mu_mimo = true;
 560                                 break;
 561                         }
 562                 }
 563                 if (disable_mu_mimo)
 564                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 565                 else
 566                         sdata->vif.mu_mimo_owner = true;
 567         }
 568
 569         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 570
 571         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 572         our_bf_sts = cap & mask;
 573
 574         if (ap_bf_sts < our_bf_sts) {
 575                 cap &= ~mask;
 576                 cap |= ap_bf_sts;
 577         }
 578
 579         /* reserve and fill IE */
 580         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 581         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 582 }
 583
 584 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 585 {
 586         struct ieee80211_local *local = sdata->local;
 587         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 588         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 589         struct sk_buff *skb;
 590         struct ieee80211_mgmt *mgmt;
 591         u8 *pos, qos_info;
 592         size_t offset = 0, noffset;
 593         int i, count, rates_len, supp_rates_len, shift;
 594         u16 capab;
 595         struct ieee80211_supported_band *sband;
 596         struct ieee80211_chanctx_conf *chanctx_conf;
 597         struct ieee80211_channel *chan;
 598         u32 rates = 0;
 599
 600         sdata_assert_lock(sdata);
 601
 602         rcu_read_lock();
 603         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 604         if (WARN_ON(!chanctx_conf)) {
 605                 rcu_read_unlock();
 606                 return;
 607         }
 608         chan = chanctx_conf->def.chan;
 609         rcu_read_unlock();
 610         sband = local->hw.wiphy->bands[chan->band];
 611         shift = ieee80211_vif_get_shift(&sdata->vif);
 612
 613         if (assoc_data->supp_rates_len) {
 614                 /*
 615                  * Get all rates supported by the device and the AP as
 616                  * some APs don't like getting a superset of their rates
 617                  * in the association request (e.g. D-Link DAP 1353 in
 618                  * b-only mode)...
 619                  */
 620                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 621                                                      assoc_data->supp_rates,
 622                                                      assoc_data->supp_rates_len,
 623                                                      &rates);
 624         } else {
 625                 /*
 626                  * In case AP not provide any supported rates information
 627                  * before association, we send information element(s) with
 628                  * all rates that we support.
 629                  */
 630                 rates_len = 0;
 631                 for (i = 0; i < sband->n_bitrates; i++) {
 632                         rates |= BIT(i);
 633                         rates_len++;
 634                 }
 635         }
 636
 637         skb = alloc_skb(local->hw.extra_tx_headroom +
 638                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 639                         2 + assoc_data->ssid_len + /* SSID */
 640                         4 + rates_len + /* (extended) rates */
 641                         4 + /* power capability */
 642                         2 + 2 * sband->n_channels + /* supported channels */
 643                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 644                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 645                         assoc_data->ie_len + /* extra IEs */
 646                         (assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
 647                         9, /* WMM */
 648                         GFP_KERNEL);
 649         if (!skb)
 650                 return;
 651
 652         skb_reserve(skb, local->hw.extra_tx_headroom);
 653
 654         capab = WLAN_CAPABILITY_ESS;
 655
 656         if (sband->band == NL80211_BAND_2GHZ) {
 657                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 658                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 659         }
 660
 661         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 662                 capab |= WLAN_CAPABILITY_PRIVACY;
 663
 664         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 665             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 666                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 667
 668         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 669                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 670
 671         mgmt = skb_put_zero(skb, 24);
 672         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 673         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 674         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 675
 676         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 677                 skb_put(skb, 10);
 678                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 679                                                   IEEE80211_STYPE_REASSOC_REQ);
 680                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 681                 mgmt->u.reassoc_req.listen_interval =
 682                                 cpu_to_le16(local->hw.conf.listen_interval);
 683                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 684                        ETH_ALEN);
 685         } else {
 686                 skb_put(skb, 4);
 687                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 688                                                   IEEE80211_STYPE_ASSOC_REQ);
 689                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 690                 mgmt->u.assoc_req.listen_interval =
 691                                 cpu_to_le16(local->hw.conf.listen_interval);
 692         }
 693
 694         /* SSID */
 695         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 696         *pos++ = WLAN_EID_SSID;
 697         *pos++ = assoc_data->ssid_len;
 698         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 699
 700         /* add all rates which were marked to be used above */
 701         supp_rates_len = rates_len;
 702         if (supp_rates_len > 8)
 703                 supp_rates_len = 8;
 704
 705         pos = skb_put(skb, supp_rates_len + 2);
 706         *pos++ = WLAN_EID_SUPP_RATES;
 707         *pos++ = supp_rates_len;
 708
 709         count = 0;
 710         for (i = 0; i < sband->n_bitrates; i++) {
 711                 if (BIT(i) & rates) {
 712                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 713                                                 5 * (1 << shift));
 714                         *pos++ = (u8) rate;
 715                         if (++count == 8)
 716                                 break;
 717                 }
 718         }
 719
 720         if (rates_len > count) {
 721                 pos = skb_put(skb, rates_len - count + 2);
 722                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 723                 *pos++ = rates_len - count;
 724
 725                 for (i++; i < sband->n_bitrates; i++) {
 726                         if (BIT(i) & rates) {
 727                                 int rate;
 728                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 729                                                     5 * (1 << shift));
 730                                 *pos++ = (u8) rate;
 731                         }
 732                 }
 733         }
 734
 735         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 736             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 737                 pos = skb_put(skb, 4);
 738                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 739                 *pos++ = 2;
 740                 *pos++ = 0; /* min tx power */
 741                  /* max tx power */
 742                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 743         }
 744
 745         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 746                 /* TODO: get this in reg domain format */
 747                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 748                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 749                 *pos++ = 2 * sband->n_channels;
 750                 for (i = 0; i < sband->n_channels; i++) {
 751                         *pos++ = ieee80211_frequency_to_channel(
 752                                         sband->channels[i].center_freq);
 753                         *pos++ = 1; /* one channel in the subband*/
 754                 }
 755         }
 756
 757         /* if present, add any custom IEs that go before HT */
 758         if (assoc_data->ie_len) {
 759                 static const u8 before_ht[] = {
 760                         WLAN_EID_SSID,
 761                         WLAN_EID_SUPP_RATES,
 762                         WLAN_EID_EXT_SUPP_RATES,
 763                         WLAN_EID_PWR_CAPABILITY,
 764                         WLAN_EID_SUPPORTED_CHANNELS,
 765                         WLAN_EID_RSN,
 766                         WLAN_EID_QOS_CAPA,
 767                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 768                         WLAN_EID_MOBILITY_DOMAIN,
 769                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 770                         WLAN_EID_RIC_DATA,              /* reassoc only */
 771                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 772                 };
 773                 static const u8 after_ric[] = {
 774                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 775                         WLAN_EID_HT_CAPABILITY,
 776                         WLAN_EID_BSS_COEX_2040,
 777                         /* luckily this is almost always there */
 778                         WLAN_EID_EXT_CAPABILITY,
 779                         WLAN_EID_QOS_TRAFFIC_CAPA,
 780                         WLAN_EID_TIM_BCAST_REQ,
 781                         WLAN_EID_INTERWORKING,
 782                         /* 60 GHz (Multi-band, DMG, MMS) can't happen */
 783                         WLAN_EID_VHT_CAPABILITY,
 784                         WLAN_EID_OPMODE_NOTIF,
 785                 };
 786
 787                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 788                                                  assoc_data->ie_len,
 789                                                  before_ht,
 790                                                  ARRAY_SIZE(before_ht),
 791                                                  after_ric,
 792                                                  ARRAY_SIZE(after_ric),
 793                                                  offset);
 794                 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
 795                 offset = noffset;
 796         }
 797
 798         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 799                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 800                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 801
 802         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 803                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 804                                     sband, chan, sdata->smps_mode);
 805
 806         /* if present, add any custom IEs that go before VHT */
 807         if (assoc_data->ie_len) {
 808                 static const u8 before_vht[] = {
 809                         /*
 810                          * no need to list the ones split off before HT
 811                          * or generated here
 812                          */
 813                         WLAN_EID_BSS_COEX_2040,
 814                         WLAN_EID_EXT_CAPABILITY,
 815                         WLAN_EID_QOS_TRAFFIC_CAPA,
 816                         WLAN_EID_TIM_BCAST_REQ,
 817                         WLAN_EID_INTERWORKING,
 818                         /* 60 GHz (Multi-band, DMG, MMS) can't happen */
 819                 };
 820
 821                 /* RIC already taken above, so no need to handle here anymore */
 822                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 823                                              before_vht, ARRAY_SIZE(before_vht),
 824                                              offset);
 825                 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
 826                 offset = noffset;
 827         }
 828
 829         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 830                 ieee80211_add_vht_ie(sdata, skb, sband,
 831                                      &assoc_data->ap_vht_cap);
 832
 833         /* if present, add any custom non-vendor IEs that go after HT */
 834         if (assoc_data->ie_len) {
 835                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 836                                                     assoc_data->ie_len,
 837                                                     offset);
 838                 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
 839                 offset = noffset;
 840         }
 841
 842         if (assoc_data->wmm) {
 843                 if (assoc_data->uapsd) {
 844                         qos_info = ifmgd->uapsd_queues;
 845                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 846                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 847                 } else {
 848                         qos_info = 0;
 849                 }
 850
 851                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 852         }
 853
 854         /* add any remaining custom (i.e. vendor specific here) IEs */
 855         if (assoc_data->ie_len) {
 856                 noffset = assoc_data->ie_len;
 857                 skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
 858         }
 859
 860         if (assoc_data->fils_kek_len &&
 861             fils_encrypt_assoc_req(skb, assoc_data) < 0) {
 862                 dev_kfree_skb(skb);
 863                 return;
 864         }
 865
 866         drv_mgd_prepare_tx(local, sdata);
 867
 868         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 869         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 870                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 871                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 872         ieee80211_tx_skb(sdata, skb);
 873 }
 874
 875 void ieee80211_send_pspoll(struct ieee80211_local *local,
 876                            struct ieee80211_sub_if_data *sdata)
 877 {
 878         struct ieee80211_pspoll *pspoll;
 879         struct sk_buff *skb;
 880
 881         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 882         if (!skb)
 883                 return;
 884
 885         pspoll = (struct ieee80211_pspoll *) skb->data;
 886         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 887
 888         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 889         ieee80211_tx_skb(sdata, skb);
 890 }
 891
 892 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 893                              struct ieee80211_sub_if_data *sdata,
 894                              bool powersave)
 895 {
 896         struct sk_buff *skb;
 897         struct ieee80211_hdr_3addr *nullfunc;
 898         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 899
 900         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif,
 901                 !ieee80211_hw_check(&local->hw, DOESNT_SUPPORT_QOS_NDP));
 902         if (!skb)
 903                 return;
 904
 905         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 906         if (powersave)
 907                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 908
 909         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 910                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 911
 912         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 913                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 914
 915         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 916                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 917
 918         ieee80211_tx_skb(sdata, skb);
 919 }
 920
 921 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 922                                           struct ieee80211_sub_if_data *sdata)
 923 {
 924         struct sk_buff *skb;
 925         struct ieee80211_hdr *nullfunc;
 926         __le16 fc;
 927
 928         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 929                 return;
 930
 931         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 932         if (!skb)
 933                 return;
 934
 935         skb_reserve(skb, local->hw.extra_tx_headroom);
 936
 937         nullfunc = skb_put_zero(skb, 30);
 938         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 939                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 940         nullfunc->frame_control = fc;
 941         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 942         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 943         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 944         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 945
 946         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 947         ieee80211_tx_skb(sdata, skb);
 948 }
 949
 950 /* spectrum management related things */
 951 static void ieee80211_chswitch_work(struct work_struct *work)
 952 {
 953         struct ieee80211_sub_if_data *sdata =
 954                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 955         struct ieee80211_local *local = sdata->local;
 956         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 957         int ret;
 958
 959         if (!ieee80211_sdata_running(sdata))
 960                 return;
 961
 962         sdata_lock(sdata);
 963         mutex_lock(&local->mtx);
 964         mutex_lock(&local->chanctx_mtx);
 965
 966         if (!ifmgd->associated)
 967                 goto out;
 968
 969         if (!sdata->vif.csa_active)
 970                 goto out;
 971
 972         /*
 973          * using reservation isn't immediate as it may be deferred until later
 974          * with multi-vif. once reservation is complete it will re-schedule the
 975          * work with no reserved_chanctx so verify chandef to check if it
 976          * completed successfully
 977          */
 978
 979         if (sdata->reserved_chanctx) {
 980                 /*
 981                  * with multi-vif csa driver may call ieee80211_csa_finish()
 982                  * many times while waiting for other interfaces to use their
 983                  * reservations
 984                  */
 985                 if (sdata->reserved_ready)
 986                         goto out;
 987
 988                 ret = ieee80211_vif_use_reserved_context(sdata);
 989                 if (ret) {
 990                         sdata_info(sdata,
 991                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
 992                                    ret);
 993                         ieee80211_queue_work(&sdata->local->hw,
 994                                              &ifmgd->csa_connection_drop_work);
 995                         goto out;
 996                 }
 997
 998                 goto out;
 999         }
1000
1001         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1002                                         &sdata->csa_chandef)) {
1003                 sdata_info(sdata,
1004                            "failed to finalize channel switch, disconnecting\n");
1005                 ieee80211_queue_work(&sdata->local->hw,
1006                                      &ifmgd->csa_connection_drop_work);
1007                 goto out;
1008         }
1009
1010         /* XXX: shouldn't really modify cfg80211-owned data! */
1011         ifmgd->associated->channel = sdata->csa_chandef.chan;
1012
1013         ifmgd->csa_waiting_bcn = true;
1014
1015         ieee80211_sta_reset_beacon_monitor(sdata);
1016         ieee80211_sta_reset_conn_monitor(sdata);
1017
1018 out:
1019         mutex_unlock(&local->chanctx_mtx);
1020         mutex_unlock(&local->mtx);
1021         sdata_unlock(sdata);
1022 }
1023
1024 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1025 {
1026         struct ieee80211_local *local = sdata->local;
1027         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1028         int ret;
1029
1030         sdata_assert_lock(sdata);
1031
1032         WARN_ON(!sdata->vif.csa_active);
1033
1034         if (sdata->csa_block_tx) {
1035                 ieee80211_wake_vif_queues(local, sdata,
1036                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1037                 sdata->csa_block_tx = false;
1038         }
1039
1040         sdata->vif.csa_active = false;
1041         ifmgd->csa_waiting_bcn = false;
1042
1043         ret = drv_post_channel_switch(sdata);
1044         if (ret) {
1045                 sdata_info(sdata,
1046                            "driver post channel switch failed, disconnecting\n");
1047                 ieee80211_queue_work(&local->hw,
1048                                      &ifmgd->csa_connection_drop_work);
1049                 return;
1050         }
1051
1052         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1053 }
1054
1055 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1056 {
1057         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1058         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1059
1060         trace_api_chswitch_done(sdata, success);
1061         if (!success) {
1062                 sdata_info(sdata,
1063                            "driver channel switch failed, disconnecting\n");
1064                 ieee80211_queue_work(&sdata->local->hw,
1065                                      &ifmgd->csa_connection_drop_work);
1066         } else {
1067                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1068         }
1069 }
1070 EXPORT_SYMBOL(ieee80211_chswitch_done);
1071
1072 static void ieee80211_chswitch_timer(struct timer_list *t)
1073 {
1074         struct ieee80211_sub_if_data *sdata =
1075                 from_timer(sdata, t, u.mgd.chswitch_timer);
1076
1077         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1078 }
1079
1080 static void
1081 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1082                                  u64 timestamp, u32 device_timestamp,
1083                                  struct ieee802_11_elems *elems,
1084                                  bool beacon)
1085 {
1086         struct ieee80211_local *local = sdata->local;
1087         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1088         struct cfg80211_bss *cbss = ifmgd->associated;
1089         struct ieee80211_chanctx_conf *conf;
1090         struct ieee80211_chanctx *chanctx;
1091         enum nl80211_band current_band;
1092         struct ieee80211_csa_ie csa_ie;
1093         struct ieee80211_channel_switch ch_switch;
1094         int res;
1095
1096         sdata_assert_lock(sdata);
1097
1098         if (!cbss)
1099                 return;
1100
1101         if (local->scanning)
1102                 return;
1103
1104         /* disregard subsequent announcements if we are already processing */
1105         if (sdata->vif.csa_active)
1106                 return;
1107
1108         current_band = cbss->channel->band;
1109         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1110                                            ifmgd->flags,
1111                                            ifmgd->associated->bssid, &csa_ie);
1112         if (res < 0)
1113                 ieee80211_queue_work(&local->hw,
1114                                      &ifmgd->csa_connection_drop_work);
1115         if (res)
1116                 return;
1117
1118         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1119                                      IEEE80211_CHAN_DISABLED)) {
1120                 sdata_info(sdata,
1121                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1122                            ifmgd->associated->bssid,
1123                            csa_ie.chandef.chan->center_freq,
1124                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1125                            csa_ie.chandef.center_freq2);
1126                 ieee80211_queue_work(&local->hw,
1127                                      &ifmgd->csa_connection_drop_work);
1128                 return;
1129         }
1130
1131         if (cfg80211_chandef_identical(&csa_ie.chandef,
1132                                        &sdata->vif.bss_conf.chandef)) {
1133                 if (ifmgd->csa_ignored_same_chan)
1134                         return;
1135                 sdata_info(sdata,
1136                            "AP %pM tries to chanswitch to same channel, ignore\n",
1137                            ifmgd->associated->bssid);
1138                 ifmgd->csa_ignored_same_chan = true;
1139                 return;
1140         }
1141
1142         /*
1143          * Drop all TDLS peers - either we disconnect or move to a different
1144          * channel from this point on. There's no telling what our peer will do.
1145          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1146          * have an incompatible wider chandef.
1147          */
1148         ieee80211_teardown_tdls_peers(sdata);
1149
1150         mutex_lock(&local->mtx);
1151         mutex_lock(&local->chanctx_mtx);
1152         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1153                                          lockdep_is_held(&local->chanctx_mtx));
1154         if (!conf) {
1155                 sdata_info(sdata,
1156                            "no channel context assigned to vif?, disconnecting\n");
1157                 goto drop_connection;
1158         }
1159
1160         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1161
1162         if (local->use_chanctx &&
1163             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1164                 sdata_info(sdata,
1165                            "driver doesn't support chan-switch with channel contexts\n");
1166                 goto drop_connection;
1167         }
1168
1169         ch_switch.timestamp = timestamp;
1170         ch_switch.device_timestamp = device_timestamp;
1171         ch_switch.block_tx = csa_ie.mode;
1172         ch_switch.chandef = csa_ie.chandef;
1173         ch_switch.count = csa_ie.count;
1174
1175         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1176                 sdata_info(sdata,
1177                            "preparing for channel switch failed, disconnecting\n");
1178                 goto drop_connection;
1179         }
1180
1181         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1182                                             chanctx->mode, false);
1183         if (res) {
1184                 sdata_info(sdata,
1185                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1186                            res);
1187                 goto drop_connection;
1188         }
1189         mutex_unlock(&local->chanctx_mtx);
1190
1191         sdata->vif.csa_active = true;
1192         sdata->csa_chandef = csa_ie.chandef;
1193         sdata->csa_block_tx = csa_ie.mode;
1194         ifmgd->csa_ignored_same_chan = false;
1195
1196         if (sdata->csa_block_tx)
1197                 ieee80211_stop_vif_queues(local, sdata,
1198                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1199         mutex_unlock(&local->mtx);
1200
1201         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1202                                           csa_ie.count);
1203
1204         if (local->ops->channel_switch) {
1205                 /* use driver's channel switch callback */
1206                 drv_channel_switch(local, sdata, &ch_switch);
1207                 return;
1208         }
1209
1210         /* channel switch handled in software */
1211         if (csa_ie.count <= 1)
1212                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1213         else
1214                 mod_timer(&ifmgd->chswitch_timer,
1215                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1216                                          cbss->beacon_interval));
1217         return;
1218  drop_connection:
1219         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1220         mutex_unlock(&local->chanctx_mtx);
1221         mutex_unlock(&local->mtx);
1222 }
1223
1224 static bool
1225 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1226                                  struct ieee80211_channel *channel,
1227                                  const u8 *country_ie, u8 country_ie_len,
1228                                  const u8 *pwr_constr_elem,
1229                                  int *chan_pwr, int *pwr_reduction)
1230 {
1231         struct ieee80211_country_ie_triplet *triplet;
1232         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1233         int i, chan_increment;
1234         bool have_chan_pwr = false;
1235
1236         /* Invalid IE */
1237         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1238                 return false;
1239
1240         triplet = (void *)(country_ie + 3);
1241         country_ie_len -= 3;
1242
1243         switch (channel->band) {
1244         default:
1245                 WARN_ON_ONCE(1);
1246                 /* fall through */
1247         case NL80211_BAND_2GHZ:
1248         case NL80211_BAND_60GHZ:
1249                 chan_increment = 1;
1250                 break;
1251         case NL80211_BAND_5GHZ:
1252                 chan_increment = 4;
1253                 break;
1254         }
1255
1256         /* find channel */
1257         while (country_ie_len >= 3) {
1258                 u8 first_channel = triplet->chans.first_channel;
1259
1260                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1261                         goto next;
1262
1263                 for (i = 0; i < triplet->chans.num_channels; i++) {
1264                         if (first_channel + i * chan_increment == chan) {
1265                                 have_chan_pwr = true;
1266                                 *chan_pwr = triplet->chans.max_power;
1267                                 break;
1268                         }
1269                 }
1270                 if (have_chan_pwr)
1271                         break;
1272
1273  next:
1274                 triplet++;
1275                 country_ie_len -= 3;
1276         }
1277
1278         if (have_chan_pwr && pwr_constr_elem)
1279                 *pwr_reduction = *pwr_constr_elem;
1280         else
1281                 *pwr_reduction = 0;
1282
1283         return have_chan_pwr;
1284 }
1285
1286 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1287                                       struct ieee80211_channel *channel,
1288                                       const u8 *cisco_dtpc_ie,
1289                                       int *pwr_level)
1290 {
1291         /* From practical testing, the first data byte of the DTPC element
1292          * seems to contain the requested dBm level, and the CLI on Cisco
1293          * APs clearly state the range is -127 to 127 dBm, which indicates
1294          * a signed byte, although it seemingly never actually goes negative.
1295          * The other byte seems to always be zero.
1296          */
1297         *pwr_level = (__s8)cisco_dtpc_ie[4];
1298 }
1299
1300 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1301                                        struct ieee80211_channel *channel,
1302                                        struct ieee80211_mgmt *mgmt,
1303                                        const u8 *country_ie, u8 country_ie_len,
1304                                        const u8 *pwr_constr_ie,
1305                                        const u8 *cisco_dtpc_ie)
1306 {
1307         bool has_80211h_pwr = false, has_cisco_pwr = false;
1308         int chan_pwr = 0, pwr_reduction_80211h = 0;
1309         int pwr_level_cisco, pwr_level_80211h;
1310         int new_ap_level;
1311         __le16 capab = mgmt->u.probe_resp.capab_info;
1312
1313         if (country_ie &&
1314             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1315              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1316                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1317                         sdata, channel, country_ie, country_ie_len,
1318                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1319                 pwr_level_80211h =
1320                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1321         }
1322
1323         if (cisco_dtpc_ie) {
1324                 ieee80211_find_cisco_dtpc(
1325                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1326                 has_cisco_pwr = true;
1327         }
1328
1329         if (!has_80211h_pwr && !has_cisco_pwr)
1330                 return 0;
1331
1332         /* If we have both 802.11h and Cisco DTPC, apply both limits
1333          * by picking the smallest of the two power levels advertised.
1334          */
1335         if (has_80211h_pwr &&
1336             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1337                 new_ap_level = pwr_level_80211h;
1338
1339                 if (sdata->ap_power_level == new_ap_level)
1340                         return 0;
1341
1342                 sdata_dbg(sdata,
1343                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1344                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1345                           sdata->u.mgd.bssid);
1346         } else {  /* has_cisco_pwr is always true here. */
1347                 new_ap_level = pwr_level_cisco;
1348
1349                 if (sdata->ap_power_level == new_ap_level)
1350                         return 0;
1351
1352                 sdata_dbg(sdata,
1353                           "Limiting TX power to %d dBm as advertised by %pM\n",
1354                           pwr_level_cisco, sdata->u.mgd.bssid);
1355         }
1356
1357         sdata->ap_power_level = new_ap_level;
1358         if (__ieee80211_recalc_txpower(sdata))
1359                 return BSS_CHANGED_TXPOWER;
1360         return 0;
1361 }
1362
1363 /* powersave */
1364 static void ieee80211_enable_ps(struct ieee80211_local *local,
1365                                 struct ieee80211_sub_if_data *sdata)
1366 {
1367         struct ieee80211_conf *conf = &local->hw.conf;
1368
1369         /*
1370          * If we are scanning right now then the parameters will
1371          * take effect when scan finishes.
1372          */
1373         if (local->scanning)
1374                 return;
1375
1376         if (conf->dynamic_ps_timeout > 0 &&
1377             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1378                 mod_timer(&local->dynamic_ps_timer, jiffies +
1379                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1380         } else {
1381                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1382                         ieee80211_send_nullfunc(local, sdata, true);
1383
1384                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1385                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1386                         return;
1387
1388                 conf->flags |= IEEE80211_CONF_PS;
1389                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1390         }
1391 }
1392
1393 static void ieee80211_change_ps(struct ieee80211_local *local)
1394 {
1395         struct ieee80211_conf *conf = &local->hw.conf;
1396
1397         if (local->ps_sdata) {
1398                 ieee80211_enable_ps(local, local->ps_sdata);
1399         } else if (conf->flags & IEEE80211_CONF_PS) {
1400                 conf->flags &= ~IEEE80211_CONF_PS;
1401                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1402                 del_timer_sync(&local->dynamic_ps_timer);
1403                 cancel_work_sync(&local->dynamic_ps_enable_work);
1404         }
1405 }
1406
1407 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1408 {
1409         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1410         struct sta_info *sta = NULL;
1411         bool authorized = false;
1412
1413         if (!mgd->powersave)
1414                 return false;
1415
1416         if (mgd->broken_ap)
1417                 return false;
1418
1419         if (!mgd->associated)
1420                 return false;
1421
1422         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1423                 return false;
1424
1425         if (!mgd->have_beacon)
1426                 return false;
1427
1428         rcu_read_lock();
1429         sta = sta_info_get(sdata, mgd->bssid);
1430         if (sta)
1431                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1432         rcu_read_unlock();
1433
1434         return authorized;
1435 }
1436
1437 /* need to hold RTNL or interface lock */
1438 void ieee80211_recalc_ps(struct ieee80211_local *local)
1439 {
1440         struct ieee80211_sub_if_data *sdata, *found = NULL;
1441         int count = 0;
1442         int timeout;
1443
1444         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1445                 local->ps_sdata = NULL;
1446                 return;
1447         }
1448
1449         list_for_each_entry(sdata, &local->interfaces, list) {
1450                 if (!ieee80211_sdata_running(sdata))
1451                         continue;
1452                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1453                         /* If an AP vif is found, then disable PS
1454                          * by setting the count to zero thereby setting
1455                          * ps_sdata to NULL.
1456                          */
1457                         count = 0;
1458                         break;
1459                 }
1460                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1461                         continue;
1462                 found = sdata;
1463                 count++;
1464         }
1465
1466         if (count == 1 && ieee80211_powersave_allowed(found)) {
1467                 u8 dtimper = found->u.mgd.dtim_period;
1468
1469                 timeout = local->dynamic_ps_forced_timeout;
1470                 if (timeout < 0)
1471                         timeout = 100;
1472                 local->hw.conf.dynamic_ps_timeout = timeout;
1473
1474                 /* If the TIM IE is invalid, pretend the value is 1 */
1475                 if (!dtimper)
1476                         dtimper = 1;
1477
1478                 local->hw.conf.ps_dtim_period = dtimper;
1479                 local->ps_sdata = found;
1480         } else {
1481                 local->ps_sdata = NULL;
1482         }
1483
1484         ieee80211_change_ps(local);
1485 }
1486
1487 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1488 {
1489         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1490
1491         if (sdata->vif.bss_conf.ps != ps_allowed) {
1492                 sdata->vif.bss_conf.ps = ps_allowed;
1493                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1494         }
1495 }
1496
1497 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1498 {
1499         struct ieee80211_local *local =
1500                 container_of(work, struct ieee80211_local,
1501                              dynamic_ps_disable_work);
1502
1503         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1504                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1505                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1506         }
1507
1508         ieee80211_wake_queues_by_reason(&local->hw,
1509                                         IEEE80211_MAX_QUEUE_MAP,
1510                                         IEEE80211_QUEUE_STOP_REASON_PS,
1511                                         false);
1512 }
1513
1514 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1515 {
1516         struct ieee80211_local *local =
1517                 container_of(work, struct ieee80211_local,
1518                              dynamic_ps_enable_work);
1519         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1520         struct ieee80211_if_managed *ifmgd;
1521         unsigned long flags;
1522         int q;
1523
1524         /* can only happen when PS was just disabled anyway */
1525         if (!sdata)
1526                 return;
1527
1528         ifmgd = &sdata->u.mgd;
1529
1530         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1531                 return;
1532
1533         if (local->hw.conf.dynamic_ps_timeout > 0) {
1534                 /* don't enter PS if TX frames are pending */
1535                 if (drv_tx_frames_pending(local)) {
1536                         mod_timer(&local->dynamic_ps_timer, jiffies +
1537                                   msecs_to_jiffies(
1538                                   local->hw.conf.dynamic_ps_timeout));
1539                         return;
1540                 }
1541
1542                 /*
1543                  * transmission can be stopped by others which leads to
1544                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1545                  * is not the actual idle state.
1546                  */
1547                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1548                 for (q = 0; q < local->hw.queues; q++) {
1549                         if (local->queue_stop_reasons[q]) {
1550                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1551                                                        flags);
1552                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1553                                           msecs_to_jiffies(
1554                                           local->hw.conf.dynamic_ps_timeout));
1555                                 return;
1556                         }
1557                 }
1558                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1559         }
1560
1561         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1562             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1563                 if (drv_tx_frames_pending(local)) {
1564                         mod_timer(&local->dynamic_ps_timer, jiffies +
1565                                   msecs_to_jiffies(
1566                                   local->hw.conf.dynamic_ps_timeout));
1567                 } else {
1568                         ieee80211_send_nullfunc(local, sdata, true);
1569                         /* Flush to get the tx status of nullfunc frame */
1570                         ieee80211_flush_queues(local, sdata, false);
1571                 }
1572         }
1573
1574         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1575               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1576             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1577                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1578                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1579                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1580         }
1581 }
1582
1583 void ieee80211_dynamic_ps_timer(struct timer_list *t)
1584 {
1585         struct ieee80211_local *local = from_timer(local, t, dynamic_ps_timer);
1586
1587         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1588 }
1589
1590 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1591 {
1592         struct delayed_work *delayed_work = to_delayed_work(work);
1593         struct ieee80211_sub_if_data *sdata =
1594                 container_of(delayed_work, struct ieee80211_sub_if_data,
1595                              dfs_cac_timer_work);
1596         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1597
1598         mutex_lock(&sdata->local->mtx);
1599         if (sdata->wdev.cac_started) {
1600                 ieee80211_vif_release_channel(sdata);
1601                 cfg80211_cac_event(sdata->dev, &chandef,
1602                                    NL80211_RADAR_CAC_FINISHED,
1603                                    GFP_KERNEL);
1604         }
1605         mutex_unlock(&sdata->local->mtx);
1606 }
1607
1608 static bool
1609 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1610 {
1611         struct ieee80211_local *local = sdata->local;
1612         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1613         bool ret = false;
1614         int ac;
1615
1616         if (local->hw.queues < IEEE80211_NUM_ACS)
1617                 return false;
1618
1619         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1620                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1621                 int non_acm_ac;
1622                 unsigned long now = jiffies;
1623
1624                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1625                     tx_tspec->admitted_time &&
1626                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1627                         tx_tspec->consumed_tx_time = 0;
1628                         tx_tspec->time_slice_start = now;
1629
1630                         if (tx_tspec->downgraded)
1631                                 tx_tspec->action =
1632                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1633                 }
1634
1635                 switch (tx_tspec->action) {
1636                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1637                         /* take the original parameters */
1638                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1639                                 sdata_err(sdata,
1640                                           "failed to set TX queue parameters for queue %d\n",
1641                                           ac);
1642                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1643                         tx_tspec->downgraded = false;
1644                         ret = true;
1645                         break;
1646                 case TX_TSPEC_ACTION_DOWNGRADE:
1647                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1648                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1649                                 ret = true;
1650                                 break;
1651                         }
1652                         /* downgrade next lower non-ACM AC */
1653                         for (non_acm_ac = ac + 1;
1654                              non_acm_ac < IEEE80211_NUM_ACS;
1655                              non_acm_ac++)
1656                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1657                                         break;
1658                         /* Usually the loop will result in using BK even if it
1659                          * requires admission control, but such a configuration
1660                          * makes no sense and we have to transmit somehow - the
1661                          * AC selection does the same thing.
1662                          * If we started out trying to downgrade from BK, then
1663                          * the extra condition here might be needed.
1664                          */
1665                         if (non_acm_ac >= IEEE80211_NUM_ACS)
1666                                 non_acm_ac = IEEE80211_AC_BK;
1667                         if (drv_conf_tx(local, sdata, ac,
1668                                         &sdata->tx_conf[non_acm_ac]))
1669                                 sdata_err(sdata,
1670                                           "failed to set TX queue parameters for queue %d\n",
1671                                           ac);
1672                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1673                         ret = true;
1674                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1675                                 tx_tspec->time_slice_start + HZ - now + 1);
1676                         break;
1677                 case TX_TSPEC_ACTION_NONE:
1678                         /* nothing now */
1679                         break;
1680                 }
1681         }
1682
1683         return ret;
1684 }
1685
1686 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1687 {
1688         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1689                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1690 }
1691
1692 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1693 {
1694         struct ieee80211_sub_if_data *sdata;
1695
1696         sdata = container_of(work, struct ieee80211_sub_if_data,
1697                              u.mgd.tx_tspec_wk.work);
1698         ieee80211_sta_handle_tspec_ac_params(sdata);
1699 }
1700
1701 /* MLME */
1702 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1703                                      struct ieee80211_sub_if_data *sdata,
1704                                      const u8 *wmm_param, size_t wmm_param_len)
1705 {
1706         struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1707         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1708         size_t left;
1709         int count, ac;
1710         const u8 *pos;
1711         u8 uapsd_queues = 0;
1712
1713         if (!local->ops->conf_tx)
1714                 return false;
1715
1716         if (local->hw.queues < IEEE80211_NUM_ACS)
1717                 return false;
1718
1719         if (!wmm_param)
1720                 return false;
1721
1722         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1723                 return false;
1724
1725         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1726                 uapsd_queues = ifmgd->uapsd_queues;
1727
1728         count = wmm_param[6] & 0x0f;
1729         if (count == ifmgd->wmm_last_param_set)
1730                 return false;
1731         ifmgd->wmm_last_param_set = count;
1732
1733         pos = wmm_param + 8;
1734         left = wmm_param_len - 8;
1735
1736         memset(&params, 0, sizeof(params));
1737
1738         sdata->wmm_acm = 0;
1739         for (; left >= 4; left -= 4, pos += 4) {
1740                 int aci = (pos[0] >> 5) & 0x03;
1741                 int acm = (pos[0] >> 4) & 0x01;
1742                 bool uapsd = false;
1743
1744                 switch (aci) {
1745                 case 1: /* AC_BK */
1746                         ac = IEEE80211_AC_BK;
1747                         if (acm)
1748                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1749                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1750                                 uapsd = true;
1751                         break;
1752                 case 2: /* AC_VI */
1753                         ac = IEEE80211_AC_VI;
1754                         if (acm)
1755                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1756                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1757                                 uapsd = true;
1758                         break;
1759                 case 3: /* AC_VO */
1760                         ac = IEEE80211_AC_VO;
1761                         if (acm)
1762                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1763                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1764                                 uapsd = true;
1765                         break;
1766                 case 0: /* AC_BE */
1767                 default:
1768                         ac = IEEE80211_AC_BE;
1769                         if (acm)
1770                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1771                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1772                                 uapsd = true;
1773                         break;
1774                 }
1775
1776                 params[ac].aifs = pos[0] & 0x0f;
1777
1778                 if (params[ac].aifs < 2) {
1779                         sdata_info(sdata,
1780                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1781                                    params[ac].aifs, aci);
1782                         params[ac].aifs = 2;
1783                 }
1784                 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1785                 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1786                 params[ac].txop = get_unaligned_le16(pos + 2);
1787                 params[ac].acm = acm;
1788                 params[ac].uapsd = uapsd;
1789
1790                 if (params->cw_min == 0 ||
1791                     params[ac].cw_min > params[ac].cw_max) {
1792                         sdata_info(sdata,
1793                                    "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1794                                    params[ac].cw_min, params[ac].cw_max, aci);
1795                         return false;
1796                 }
1797                 ieee80211_regulatory_limit_wmm_params(sdata, &params[ac], ac);
1798         }
1799
1800         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1801                 mlme_dbg(sdata,
1802                          "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1803                          ac, params[ac].acm,
1804                          params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1805                          params[ac].txop, params[ac].uapsd,
1806                          ifmgd->tx_tspec[ac].downgraded);
1807                 sdata->tx_conf[ac] = params[ac];
1808                 if (!ifmgd->tx_tspec[ac].downgraded &&
1809                     drv_conf_tx(local, sdata, ac, &params[ac]))
1810                         sdata_err(sdata,
1811                                   "failed to set TX queue parameters for AC %d\n",
1812                                   ac);
1813         }
1814
1815         /* enable WMM or activate new settings */
1816         sdata->vif.bss_conf.qos = true;
1817         return true;
1818 }
1819
1820 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1821 {
1822         lockdep_assert_held(&sdata->local->mtx);
1823
1824         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1825         ieee80211_run_deferred_scan(sdata->local);
1826 }
1827
1828 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1829 {
1830         mutex_lock(&sdata->local->mtx);
1831         __ieee80211_stop_poll(sdata);
1832         mutex_unlock(&sdata->local->mtx);
1833 }
1834
1835 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1836                                            u16 capab, bool erp_valid, u8 erp)
1837 {
1838         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1839         struct ieee80211_supported_band *sband;
1840         u32 changed = 0;
1841         bool use_protection;
1842         bool use_short_preamble;
1843         bool use_short_slot;
1844
1845         sband = ieee80211_get_sband(sdata);
1846         if (!sband)
1847                 return changed;
1848
1849         if (erp_valid) {
1850                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1851                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1852         } else {
1853                 use_protection = false;
1854                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1855         }
1856
1857         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1858         if (sband->band == NL80211_BAND_5GHZ)
1859                 use_short_slot = true;
1860
1861         if (use_protection != bss_conf->use_cts_prot) {
1862                 bss_conf->use_cts_prot = use_protection;
1863                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1864         }
1865
1866         if (use_short_preamble != bss_conf->use_short_preamble) {
1867                 bss_conf->use_short_preamble = use_short_preamble;
1868                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1869         }
1870
1871         if (use_short_slot != bss_conf->use_short_slot) {
1872                 bss_conf->use_short_slot = use_short_slot;
1873                 changed |= BSS_CHANGED_ERP_SLOT;
1874         }
1875
1876         return changed;
1877 }
1878
1879 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1880                                      struct cfg80211_bss *cbss,
1881                                      u32 bss_info_changed)
1882 {
1883         struct ieee80211_bss *bss = (void *)cbss->priv;
1884         struct ieee80211_local *local = sdata->local;
1885         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1886
1887         bss_info_changed |= BSS_CHANGED_ASSOC;
1888         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1889                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1890
1891         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1892                 beacon_loss_count * bss_conf->beacon_int));
1893
1894         sdata->u.mgd.associated = cbss;
1895         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1896
1897         ieee80211_check_rate_mask(sdata);
1898
1899         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1900
1901         if (sdata->vif.p2p ||
1902             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1903                 const struct cfg80211_bss_ies *ies;
1904
1905                 rcu_read_lock();
1906                 ies = rcu_dereference(cbss->ies);
1907                 if (ies) {
1908                         int ret;
1909
1910                         ret = cfg80211_get_p2p_attr(
1911                                         ies->data, ies->len,
1912                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1913                                         (u8 *) &bss_conf->p2p_noa_attr,
1914                                         sizeof(bss_conf->p2p_noa_attr));
1915                         if (ret >= 2) {
1916                                 sdata->u.mgd.p2p_noa_index =
1917                                         bss_conf->p2p_noa_attr.index;
1918                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1919                         }
1920                 }
1921                 rcu_read_unlock();
1922         }
1923
1924         /* just to be sure */
1925         ieee80211_stop_poll(sdata);
1926
1927         ieee80211_led_assoc(local, 1);
1928
1929         if (sdata->u.mgd.have_beacon) {
1930                 /*
1931                  * If the AP is buggy we may get here with no DTIM period
1932                  * known, so assume it's 1 which is the only safe assumption
1933                  * in that case, although if the TIM IE is broken powersave
1934                  * probably just won't work at all.
1935                  */
1936                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1937                 bss_conf->beacon_rate = bss->beacon_rate;
1938                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1939         } else {
1940                 bss_conf->beacon_rate = NULL;
1941                 bss_conf->dtim_period = 0;
1942         }
1943
1944         bss_conf->assoc = 1;
1945
1946         /* Tell the driver to monitor connection quality (if supported) */
1947         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1948             bss_conf->cqm_rssi_thold)
1949                 bss_info_changed |= BSS_CHANGED_CQM;
1950
1951         /* Enable ARP filtering */
1952         if (bss_conf->arp_addr_cnt)
1953                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1954
1955         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1956
1957         mutex_lock(&local->iflist_mtx);
1958         ieee80211_recalc_ps(local);
1959         mutex_unlock(&local->iflist_mtx);
1960
1961         ieee80211_recalc_smps(sdata);
1962         ieee80211_recalc_ps_vif(sdata);
1963
1964         netif_carrier_on(sdata->dev);
1965 }
1966
1967 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1968                                    u16 stype, u16 reason, bool tx,
1969                                    u8 *frame_buf)
1970 {
1971         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1972         struct ieee80211_local *local = sdata->local;
1973         u32 changed = 0;
1974
1975         sdata_assert_lock(sdata);
1976
1977         if (WARN_ON_ONCE(tx && !frame_buf))
1978                 return;
1979
1980         if (WARN_ON(!ifmgd->associated))
1981                 return;
1982
1983         ieee80211_stop_poll(sdata);
1984
1985         ifmgd->associated = NULL;
1986         netif_carrier_off(sdata->dev);
1987
1988         /*
1989          * if we want to get out of ps before disassoc (why?) we have
1990          * to do it before sending disassoc, as otherwise the null-packet
1991          * won't be valid.
1992          */
1993         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1994                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1995                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1996         }
1997         local->ps_sdata = NULL;
1998
1999         /* disable per-vif ps */
2000         ieee80211_recalc_ps_vif(sdata);
2001
2002         /* make sure ongoing transmission finishes */
2003         synchronize_net();
2004
2005         /*
2006          * drop any frame before deauth/disassoc, this can be data or
2007          * management frame. Since we are disconnecting, we should not
2008          * insist sending these frames which can take time and delay
2009          * the disconnection and possible the roaming.
2010          */
2011         if (tx)
2012                 ieee80211_flush_queues(local, sdata, true);
2013
2014         /* deauthenticate/disassociate now */
2015         if (tx || frame_buf) {
2016                 /*
2017                  * In multi channel scenarios guarantee that the virtual
2018                  * interface is granted immediate airtime to transmit the
2019                  * deauthentication frame by calling mgd_prepare_tx, if the
2020                  * driver requested so.
2021                  */
2022                 if (ieee80211_hw_check(&local->hw, DEAUTH_NEED_MGD_TX_PREP) &&
2023                     !ifmgd->have_beacon)
2024                         drv_mgd_prepare_tx(sdata->local, sdata);
2025
2026                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2027                                                reason, tx, frame_buf);
2028         }
2029
2030         /* flush out frame - make sure the deauth was actually sent */
2031         if (tx)
2032                 ieee80211_flush_queues(local, sdata, false);
2033
2034         /* clear bssid only after building the needed mgmt frames */
2035         eth_zero_addr(ifmgd->bssid);
2036
2037         /* remove AP and TDLS peers */
2038         sta_info_flush(sdata);
2039
2040         /* finally reset all BSS / config parameters */
2041         changed |= ieee80211_reset_erp_info(sdata);
2042
2043         ieee80211_led_assoc(local, 0);
2044         changed |= BSS_CHANGED_ASSOC;
2045         sdata->vif.bss_conf.assoc = false;
2046
2047         ifmgd->p2p_noa_index = -1;
2048         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2049                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2050
2051         /* on the next assoc, re-program HT/VHT parameters */
2052         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2053         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2054         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2055         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2056
2057         /* reset MU-MIMO ownership and group data */
2058         memset(sdata->vif.bss_conf.mu_group.membership, 0,
2059                sizeof(sdata->vif.bss_conf.mu_group.membership));
2060         memset(sdata->vif.bss_conf.mu_group.position, 0,
2061                sizeof(sdata->vif.bss_conf.mu_group.position));
2062         changed |= BSS_CHANGED_MU_GROUPS;
2063         sdata->vif.mu_mimo_owner = false;
2064
2065         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2066
2067         del_timer_sync(&local->dynamic_ps_timer);
2068         cancel_work_sync(&local->dynamic_ps_enable_work);
2069
2070         /* Disable ARP filtering */
2071         if (sdata->vif.bss_conf.arp_addr_cnt)
2072                 changed |= BSS_CHANGED_ARP_FILTER;
2073
2074         sdata->vif.bss_conf.qos = false;
2075         changed |= BSS_CHANGED_QOS;
2076
2077         /* The BSSID (not really interesting) and HT changed */
2078         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2079         ieee80211_bss_info_change_notify(sdata, changed);
2080
2081         /* disassociated - set to defaults now */
2082         ieee80211_set_wmm_default(sdata, false, false);
2083
2084         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2085         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2086         del_timer_sync(&sdata->u.mgd.timer);
2087         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2088
2089         sdata->vif.bss_conf.dtim_period = 0;
2090         sdata->vif.bss_conf.beacon_rate = NULL;
2091
2092         ifmgd->have_beacon = false;
2093
2094         ifmgd->flags = 0;
2095         mutex_lock(&local->mtx);
2096         ieee80211_vif_release_channel(sdata);
2097
2098         sdata->vif.csa_active = false;
2099         ifmgd->csa_waiting_bcn = false;
2100         ifmgd->csa_ignored_same_chan = false;
2101         if (sdata->csa_block_tx) {
2102                 ieee80211_wake_vif_queues(local, sdata,
2103                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2104                 sdata->csa_block_tx = false;
2105         }
2106         mutex_unlock(&local->mtx);
2107
2108         /* existing TX TSPEC sessions no longer exist */
2109         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2110         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2111
2112         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2113 }
2114
2115 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2116                              struct ieee80211_hdr *hdr)
2117 {
2118         /*
2119          * We can postpone the mgd.timer whenever receiving unicast frames
2120          * from AP because we know that the connection is working both ways
2121          * at that time. But multicast frames (and hence also beacons) must
2122          * be ignored here, because we need to trigger the timer during
2123          * data idle periods for sending the periodic probe request to the
2124          * AP we're connected to.
2125          */
2126         if (is_multicast_ether_addr(hdr->addr1))
2127                 return;
2128
2129         ieee80211_sta_reset_conn_monitor(sdata);
2130 }
2131
2132 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2133 {
2134         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2135         struct ieee80211_local *local = sdata->local;
2136
2137         mutex_lock(&local->mtx);
2138         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2139                 goto out;
2140
2141         __ieee80211_stop_poll(sdata);
2142
2143         mutex_lock(&local->iflist_mtx);
2144         ieee80211_recalc_ps(local);
2145         mutex_unlock(&local->iflist_mtx);
2146
2147         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2148                 goto out;
2149
2150         /*
2151          * We've received a probe response, but are not sure whether
2152          * we have or will be receiving any beacons or data, so let's
2153          * schedule the timers again, just in case.
2154          */
2155         ieee80211_sta_reset_beacon_monitor(sdata);
2156
2157         mod_timer(&ifmgd->conn_mon_timer,
2158                   round_jiffies_up(jiffies +
2159                                    IEEE80211_CONNECTION_IDLE_TIME));
2160 out:
2161         mutex_unlock(&local->mtx);
2162 }
2163
2164 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2165                                            struct ieee80211_hdr *hdr,
2166                                            u16 tx_time)
2167 {
2168         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2169         u16 tid = ieee80211_get_tid(hdr);
2170         int ac = ieee80211_ac_from_tid(tid);
2171         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2172         unsigned long now = jiffies;
2173
2174         if (likely(!tx_tspec->admitted_time))
2175                 return;
2176
2177         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2178                 tx_tspec->consumed_tx_time = 0;
2179                 tx_tspec->time_slice_start = now;
2180
2181                 if (tx_tspec->downgraded) {
2182                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2183                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2184                 }
2185         }
2186
2187         if (tx_tspec->downgraded)
2188                 return;
2189
2190         tx_tspec->consumed_tx_time += tx_time;
2191
2192         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2193                 tx_tspec->downgraded = true;
2194                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2195                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2196         }
2197 }
2198
2199 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2200                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2201 {
2202         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2203
2204         if (!ieee80211_is_data(hdr->frame_control))
2205             return;
2206
2207         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2208             sdata->u.mgd.probe_send_count > 0) {
2209                 if (ack)
2210                         ieee80211_sta_reset_conn_monitor(sdata);
2211                 else
2212                         sdata->u.mgd.nullfunc_failed = true;
2213                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2214                 return;
2215         }
2216
2217         if (ack)
2218                 ieee80211_sta_reset_conn_monitor(sdata);
2219 }
2220
2221 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2222 {
2223         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2224         const u8 *ssid;
2225         u8 *dst = ifmgd->associated->bssid;
2226         u8 unicast_limit = max(1, max_probe_tries - 3);
2227         struct sta_info *sta;
2228
2229         /*
2230          * Try sending broadcast probe requests for the last three
2231          * probe requests after the first ones failed since some
2232          * buggy APs only support broadcast probe requests.
2233          */
2234         if (ifmgd->probe_send_count >= unicast_limit)
2235                 dst = NULL;
2236
2237         /*
2238          * When the hardware reports an accurate Tx ACK status, it's
2239          * better to send a nullfunc frame instead of a probe request,
2240          * as it will kick us off the AP quickly if we aren't associated
2241          * anymore. The timeout will be reset if the frame is ACKed by
2242          * the AP.
2243          */
2244         ifmgd->probe_send_count++;
2245
2246         if (dst) {
2247                 mutex_lock(&sdata->local->sta_mtx);
2248                 sta = sta_info_get(sdata, dst);
2249                 if (!WARN_ON(!sta))
2250                         ieee80211_check_fast_rx(sta);
2251                 mutex_unlock(&sdata->local->sta_mtx);
2252         }
2253
2254         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2255                 ifmgd->nullfunc_failed = false;
2256                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2257         } else {
2258                 int ssid_len;
2259
2260                 rcu_read_lock();
2261                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2262                 if (WARN_ON_ONCE(ssid == NULL))
2263                         ssid_len = 0;
2264                 else
2265                         ssid_len = ssid[1];
2266
2267                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2268                                          ssid + 2, ssid_len, NULL,
2269                                          0, (u32) -1, true, 0,
2270                                          ifmgd->associated->channel, false);
2271                 rcu_read_unlock();
2272         }
2273
2274         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2275         run_again(sdata, ifmgd->probe_timeout);
2276 }
2277
2278 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2279                                    bool beacon)
2280 {
2281         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2282         bool already = false;
2283
2284         if (!ieee80211_sdata_running(sdata))
2285                 return;
2286
2287         sdata_lock(sdata);
2288
2289         if (!ifmgd->associated)
2290                 goto out;
2291
2292         mutex_lock(&sdata->local->mtx);
2293
2294         if (sdata->local->tmp_channel || sdata->local->scanning) {
2295                 mutex_unlock(&sdata->local->mtx);
2296                 goto out;
2297         }
2298
2299         if (beacon) {
2300                 mlme_dbg_ratelimited(sdata,
2301                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2302                                      beacon_loss_count);
2303
2304                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2305         }
2306
2307         /*
2308          * The driver/our work has already reported this event or the
2309          * connection monitoring has kicked in and we have already sent
2310          * a probe request. Or maybe the AP died and the driver keeps
2311          * reporting until we disassociate...
2312          *
2313          * In either case we have to ignore the current call to this
2314          * function (except for setting the correct probe reason bit)
2315          * because otherwise we would reset the timer every time and
2316          * never check whether we received a probe response!
2317          */
2318         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2319                 already = true;
2320
2321         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2322
2323         mutex_unlock(&sdata->local->mtx);
2324
2325         if (already)
2326                 goto out;
2327
2328         mutex_lock(&sdata->local->iflist_mtx);
2329         ieee80211_recalc_ps(sdata->local);
2330         mutex_unlock(&sdata->local->iflist_mtx);
2331
2332         ifmgd->probe_send_count = 0;
2333         ieee80211_mgd_probe_ap_send(sdata);
2334  out:
2335         sdata_unlock(sdata);
2336 }
2337
2338 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2339                                           struct ieee80211_vif *vif)
2340 {
2341         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2342         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2343         struct cfg80211_bss *cbss;
2344         struct sk_buff *skb;
2345         const u8 *ssid;
2346         int ssid_len;
2347
2348         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2349                 return NULL;
2350
2351         sdata_assert_lock(sdata);
2352
2353         if (ifmgd->associated)
2354                 cbss = ifmgd->associated;
2355         else if (ifmgd->auth_data)
2356                 cbss = ifmgd->auth_data->bss;
2357         else if (ifmgd->assoc_data)
2358                 cbss = ifmgd->assoc_data->bss;
2359         else
2360                 return NULL;
2361
2362         rcu_read_lock();
2363         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2364         if (WARN_ON_ONCE(ssid == NULL))
2365                 ssid_len = 0;
2366         else
2367                 ssid_len = ssid[1];
2368
2369         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2370                                         (u32) -1, cbss->channel,
2371                                         ssid + 2, ssid_len,
2372                                         NULL, 0, true);
2373         rcu_read_unlock();
2374
2375         return skb;
2376 }
2377 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2378
2379 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2380                                         const u8 *buf, size_t len, bool tx,
2381                                         u16 reason)
2382 {
2383         struct ieee80211_event event = {
2384                 .type = MLME_EVENT,
2385                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2386                 .u.mlme.reason = reason,
2387         };
2388
2389         if (tx)
2390                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2391         else
2392                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2393
2394         drv_event_callback(sdata->local, sdata, &event);
2395 }
2396
2397 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2398 {
2399         struct ieee80211_local *local = sdata->local;
2400         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2401         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2402
2403         sdata_lock(sdata);
2404         if (!ifmgd->associated) {
2405                 sdata_unlock(sdata);
2406                 return;
2407         }
2408
2409         /* AP is probably out of range (or not reachable for another reason) so
2410          * remove the bss struct for that AP.
2411          */
2412         cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
2413
2414         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2415                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2416                                true, frame_buf);
2417         mutex_lock(&local->mtx);
2418         sdata->vif.csa_active = false;
2419         ifmgd->csa_waiting_bcn = false;
2420         if (sdata->csa_block_tx) {
2421                 ieee80211_wake_vif_queues(local, sdata,
2422                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2423                 sdata->csa_block_tx = false;
2424         }
2425         mutex_unlock(&local->mtx);
2426
2427         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2428                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2429
2430         sdata_unlock(sdata);
2431 }
2432
2433 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2434 {
2435         struct ieee80211_sub_if_data *sdata =
2436                 container_of(work, struct ieee80211_sub_if_data,
2437                              u.mgd.beacon_connection_loss_work);
2438         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2439
2440         if (ifmgd->associated)
2441                 ifmgd->beacon_loss_count++;
2442
2443         if (ifmgd->connection_loss) {
2444                 sdata_info(sdata, "Connection to AP %pM lost\n",
2445                            ifmgd->bssid);
2446                 __ieee80211_disconnect(sdata);
2447         } else {
2448                 ieee80211_mgd_probe_ap(sdata, true);
2449         }
2450 }
2451
2452 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2453 {
2454         struct ieee80211_sub_if_data *sdata =
2455                 container_of(work, struct ieee80211_sub_if_data,
2456                              u.mgd.csa_connection_drop_work);
2457
2458         __ieee80211_disconnect(sdata);
2459 }
2460
2461 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2462 {
2463         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2464         struct ieee80211_hw *hw = &sdata->local->hw;
2465
2466         trace_api_beacon_loss(sdata);
2467
2468         sdata->u.mgd.connection_loss = false;
2469         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2470 }
2471 EXPORT_SYMBOL(ieee80211_beacon_loss);
2472
2473 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2474 {
2475         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2476         struct ieee80211_hw *hw = &sdata->local->hw;
2477
2478         trace_api_connection_loss(sdata);
2479
2480         sdata->u.mgd.connection_loss = true;
2481         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2482 }
2483 EXPORT_SYMBOL(ieee80211_connection_loss);
2484
2485
2486 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2487                                         bool assoc)
2488 {
2489         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2490
2491         sdata_assert_lock(sdata);
2492
2493         if (!assoc) {
2494                 /*
2495                  * we are not authenticated yet, the only timer that could be
2496                  * running is the timeout for the authentication response which
2497                  * which is not relevant anymore.
2498                  */
2499                 del_timer_sync(&sdata->u.mgd.timer);
2500                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2501
2502                 eth_zero_addr(sdata->u.mgd.bssid);
2503                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2504                 sdata->u.mgd.flags = 0;
2505                 mutex_lock(&sdata->local->mtx);
2506                 ieee80211_vif_release_channel(sdata);
2507                 mutex_unlock(&sdata->local->mtx);
2508         }
2509
2510         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2511         kfree(auth_data);
2512         sdata->u.mgd.auth_data = NULL;
2513 }
2514
2515 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2516                                          bool assoc, bool abandon)
2517 {
2518         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2519
2520         sdata_assert_lock(sdata);
2521
2522         if (!assoc) {
2523                 /*
2524                  * we are not associated yet, the only timer that could be
2525                  * running is the timeout for the association response which
2526                  * which is not relevant anymore.
2527                  */
2528                 del_timer_sync(&sdata->u.mgd.timer);
2529                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2530
2531                 eth_zero_addr(sdata->u.mgd.bssid);
2532                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2533                 sdata->u.mgd.flags = 0;
2534                 sdata->vif.mu_mimo_owner = false;
2535
2536                 mutex_lock(&sdata->local->mtx);
2537                 ieee80211_vif_release_channel(sdata);
2538                 mutex_unlock(&sdata->local->mtx);
2539
2540                 if (abandon)
2541                         cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2542         }
2543
2544         kfree(assoc_data);
2545         sdata->u.mgd.assoc_data = NULL;
2546 }
2547
2548 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2549                                      struct ieee80211_mgmt *mgmt, size_t len)
2550 {
2551         struct ieee80211_local *local = sdata->local;
2552         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2553         u8 *pos;
2554         struct ieee802_11_elems elems;
2555         u32 tx_flags = 0;
2556
2557         pos = mgmt->u.auth.variable;
2558         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2559         if (!elems.challenge)
2560                 return;
2561         auth_data->expected_transaction = 4;
2562         drv_mgd_prepare_tx(sdata->local, sdata);
2563         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2564                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2565                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2566         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2567                             elems.challenge - 2, elems.challenge_len + 2,
2568                             auth_data->bss->bssid, auth_data->bss->bssid,
2569                             auth_data->key, auth_data->key_len,
2570                             auth_data->key_idx, tx_flags);
2571 }
2572
2573 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2574                                    struct ieee80211_mgmt *mgmt, size_t len)
2575 {
2576         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2577         u8 bssid[ETH_ALEN];
2578         u16 auth_alg, auth_transaction, status_code;
2579         struct sta_info *sta;
2580         struct ieee80211_event event = {
2581                 .type = MLME_EVENT,
2582                 .u.mlme.data = AUTH_EVENT,
2583         };
2584
2585         sdata_assert_lock(sdata);
2586
2587         if (len < 24 + 6)
2588                 return;
2589
2590         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2591                 return;
2592
2593         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2594
2595         if (!ether_addr_equal(bssid, mgmt->bssid))
2596                 return;
2597
2598         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2599         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2600         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2601
2602         if (auth_alg != ifmgd->auth_data->algorithm ||
2603             auth_transaction != ifmgd->auth_data->expected_transaction) {
2604                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2605                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2606                            auth_transaction,
2607                            ifmgd->auth_data->expected_transaction);
2608                 return;
2609         }
2610
2611         if (status_code != WLAN_STATUS_SUCCESS) {
2612                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2613                            mgmt->sa, status_code);
2614                 ieee80211_destroy_auth_data(sdata, false);
2615                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2616                 event.u.mlme.status = MLME_DENIED;
2617                 event.u.mlme.reason = status_code;
2618                 drv_event_callback(sdata->local, sdata, &event);
2619                 return;
2620         }
2621
2622         switch (ifmgd->auth_data->algorithm) {
2623         case WLAN_AUTH_OPEN:
2624         case WLAN_AUTH_LEAP:
2625         case WLAN_AUTH_FT:
2626         case WLAN_AUTH_SAE:
2627         case WLAN_AUTH_FILS_SK:
2628         case WLAN_AUTH_FILS_SK_PFS:
2629         case WLAN_AUTH_FILS_PK:
2630                 break;
2631         case WLAN_AUTH_SHARED_KEY:
2632                 if (ifmgd->auth_data->expected_transaction != 4) {
2633                         ieee80211_auth_challenge(sdata, mgmt, len);
2634                         /* need another frame */
2635                         return;
2636                 }
2637                 break;
2638         default:
2639                 WARN_ONCE(1, "invalid auth alg %d",
2640                           ifmgd->auth_data->algorithm);
2641                 return;
2642         }
2643
2644         event.u.mlme.status = MLME_SUCCESS;
2645         drv_event_callback(sdata->local, sdata, &event);
2646         sdata_info(sdata, "authenticated\n");
2647         ifmgd->auth_data->done = true;
2648         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2649         ifmgd->auth_data->timeout_started = true;
2650         run_again(sdata, ifmgd->auth_data->timeout);
2651
2652         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2653             ifmgd->auth_data->expected_transaction != 2) {
2654                 /*
2655                  * Report auth frame to user space for processing since another
2656                  * round of Authentication frames is still needed.
2657                  */
2658                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2659                 return;
2660         }
2661
2662         /* move station state to auth */
2663         mutex_lock(&sdata->local->sta_mtx);
2664         sta = sta_info_get(sdata, bssid);
2665         if (!sta) {
2666                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2667                 goto out_err;
2668         }
2669         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2670                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2671                 goto out_err;
2672         }
2673         mutex_unlock(&sdata->local->sta_mtx);
2674
2675         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2676         return;
2677  out_err:
2678         mutex_unlock(&sdata->local->sta_mtx);
2679         /* ignore frame -- wait for timeout */
2680 }
2681
2682 #define case_WLAN(type) \
2683         case WLAN_REASON_##type: return #type
2684
2685 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2686 {
2687         switch (reason_code) {
2688         case_WLAN(UNSPECIFIED);
2689         case_WLAN(PREV_AUTH_NOT_VALID);
2690         case_WLAN(DEAUTH_LEAVING);
2691         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2692         case_WLAN(DISASSOC_AP_BUSY);
2693         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2694         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2695         case_WLAN(DISASSOC_STA_HAS_LEFT);
2696         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2697         case_WLAN(DISASSOC_BAD_POWER);
2698         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2699         case_WLAN(INVALID_IE);
2700         case_WLAN(MIC_FAILURE);
2701         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2702         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2703         case_WLAN(IE_DIFFERENT);
2704         case_WLAN(INVALID_GROUP_CIPHER);
2705         case_WLAN(INVALID_PAIRWISE_CIPHER);
2706         case_WLAN(INVALID_AKMP);
2707         case_WLAN(UNSUPP_RSN_VERSION);
2708         case_WLAN(INVALID_RSN_IE_CAP);
2709         case_WLAN(IEEE8021X_FAILED);
2710         case_WLAN(CIPHER_SUITE_REJECTED);
2711         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2712         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2713         case_WLAN(DISASSOC_LOW_ACK);
2714         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2715         case_WLAN(QSTA_LEAVE_QBSS);
2716         case_WLAN(QSTA_NOT_USE);
2717         case_WLAN(QSTA_REQUIRE_SETUP);
2718         case_WLAN(QSTA_TIMEOUT);
2719         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2720         case_WLAN(MESH_PEER_CANCELED);
2721         case_WLAN(MESH_MAX_PEERS);
2722         case_WLAN(MESH_CONFIG);
2723         case_WLAN(MESH_CLOSE);
2724         case_WLAN(MESH_MAX_RETRIES);
2725         case_WLAN(MESH_CONFIRM_TIMEOUT);
2726         case_WLAN(MESH_INVALID_GTK);
2727         case_WLAN(MESH_INCONSISTENT_PARAM);
2728         case_WLAN(MESH_INVALID_SECURITY);
2729         case_WLAN(MESH_PATH_ERROR);
2730         case_WLAN(MESH_PATH_NOFORWARD);
2731         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2732         case_WLAN(MAC_EXISTS_IN_MBSS);
2733         case_WLAN(MESH_CHAN_REGULATORY);
2734         case_WLAN(MESH_CHAN);
2735         default: return "<unknown>";
2736         }
2737 }
2738
2739 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2740                                      struct ieee80211_mgmt *mgmt, size_t len)
2741 {
2742         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2743         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2744
2745         sdata_assert_lock(sdata);
2746
2747         if (len < 24 + 2)
2748                 return;
2749
2750         if (ifmgd->associated &&
2751             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2752                 const u8 *bssid = ifmgd->associated->bssid;
2753
2754                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2755                            bssid, reason_code,
2756                            ieee80211_get_reason_code_string(reason_code));
2757
2758                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2759
2760                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2761                                             reason_code);
2762                 return;
2763         }
2764
2765         if (ifmgd->assoc_data &&
2766             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2767                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2768
2769                 sdata_info(sdata,
2770                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2771                            bssid, reason_code,
2772                            ieee80211_get_reason_code_string(reason_code));
2773
2774                 ieee80211_destroy_assoc_data(sdata, false, true);
2775
2776                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2777                 return;
2778         }
2779 }
2780
2781
2782 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2783                                        struct ieee80211_mgmt *mgmt, size_t len)
2784 {
2785         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2786         u16 reason_code;
2787
2788         sdata_assert_lock(sdata);
2789
2790         if (len < 24 + 2)
2791                 return;
2792
2793         if (!ifmgd->associated ||
2794             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2795                 return;
2796
2797         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2798
2799         sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
2800                    mgmt->sa, reason_code,
2801                    ieee80211_get_reason_code_string(reason_code));
2802
2803         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2804
2805         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2806 }
2807
2808 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2809                                 u8 *supp_rates, unsigned int supp_rates_len,
2810                                 u32 *rates, u32 *basic_rates,
2811                                 bool *have_higher_than_11mbit,
2812                                 int *min_rate, int *min_rate_index,
2813                                 int shift)
2814 {
2815         int i, j;
2816
2817         for (i = 0; i < supp_rates_len; i++) {
2818                 int rate = supp_rates[i] & 0x7f;
2819                 bool is_basic = !!(supp_rates[i] & 0x80);
2820
2821                 if ((rate * 5 * (1 << shift)) > 110)
2822                         *have_higher_than_11mbit = true;
2823
2824                 /*
2825                  * Skip HT and VHT BSS membership selectors since they're not
2826                  * rates.
2827                  *
2828                  * Note: Even though the membership selector and the basic
2829                  *       rate flag share the same bit, they are not exactly
2830                  *       the same.
2831                  */
2832                 if (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) ||
2833                     supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY))
2834                         continue;
2835
2836                 for (j = 0; j < sband->n_bitrates; j++) {
2837                         struct ieee80211_rate *br;
2838                         int brate;
2839
2840                         br = &sband->bitrates[j];
2841
2842                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2843                         if (brate == rate) {
2844                                 *rates |= BIT(j);
2845                                 if (is_basic)
2846                                         *basic_rates |= BIT(j);
2847                                 if ((rate * 5) < *min_rate) {
2848                                         *min_rate = rate * 5;
2849                                         *min_rate_index = j;
2850                                 }
2851                                 break;
2852                         }
2853                 }
2854         }
2855 }
2856
2857 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2858                                     struct cfg80211_bss *cbss,
2859                                     struct ieee80211_mgmt *mgmt, size_t len)
2860 {
2861         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2862         struct ieee80211_local *local = sdata->local;
2863         struct ieee80211_supported_band *sband;
2864         struct sta_info *sta;
2865         u8 *pos;
2866         u16 capab_info, aid;
2867         struct ieee802_11_elems elems;
2868         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2869         const struct cfg80211_bss_ies *bss_ies = NULL;
2870         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2871         u32 changed = 0;
2872         int err;
2873         bool ret;
2874
2875         /* AssocResp and ReassocResp have identical structure */
2876
2877         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2878         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2879
2880         /*
2881          * The 5 MSB of the AID field are reserved
2882          * (802.11-2016 9.4.1.8 AID field)
2883          */
2884         aid &= 0x7ff;
2885
2886         ifmgd->broken_ap = false;
2887
2888         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2889                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2890                            aid);
2891                 aid = 0;
2892                 ifmgd->broken_ap = true;
2893         }
2894
2895         pos = mgmt->u.assoc_resp.variable;
2896         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2897
2898         if (!elems.supp_rates) {
2899                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2900                 return false;
2901         }
2902
2903         ifmgd->aid = aid;
2904         ifmgd->tdls_chan_switch_prohibited =
2905                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2906                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2907
2908         /*
2909          * Some APs are erroneously not including some information in their
2910          * (re)association response frames. Try to recover by using the data
2911          * from the beacon or probe response. This seems to afflict mobile
2912          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2913          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2914          */
2915         if ((assoc_data->wmm && !elems.wmm_param) ||
2916             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2917              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2918             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2919              (!elems.vht_cap_elem || !elems.vht_operation))) {
2920                 const struct cfg80211_bss_ies *ies;
2921                 struct ieee802_11_elems bss_elems;
2922
2923                 rcu_read_lock();
2924                 ies = rcu_dereference(cbss->ies);
2925                 if (ies)
2926                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2927                                           GFP_ATOMIC);
2928                 rcu_read_unlock();
2929                 if (!bss_ies)
2930                         return false;
2931
2932                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2933                                        false, &bss_elems);
2934                 if (assoc_data->wmm &&
2935                     !elems.wmm_param && bss_elems.wmm_param) {
2936                         elems.wmm_param = bss_elems.wmm_param;
2937                         sdata_info(sdata,
2938                                    "AP bug: WMM param missing from AssocResp\n");
2939                 }
2940
2941                 /*
2942                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2943                  * have to include the IEs in the (re)association response.
2944                  */
2945                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2946                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2947                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2948                         sdata_info(sdata,
2949                                    "AP bug: HT capability missing from AssocResp\n");
2950                 }
2951                 if (!elems.ht_operation && bss_elems.ht_operation &&
2952                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2953                         elems.ht_operation = bss_elems.ht_operation;
2954                         sdata_info(sdata,
2955                                    "AP bug: HT operation missing from AssocResp\n");
2956                 }
2957                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2958                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2959                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2960                         sdata_info(sdata,
2961                                    "AP bug: VHT capa missing from AssocResp\n");
2962                 }
2963                 if (!elems.vht_operation && bss_elems.vht_operation &&
2964                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2965                         elems.vht_operation = bss_elems.vht_operation;
2966                         sdata_info(sdata,
2967                                    "AP bug: VHT operation missing from AssocResp\n");
2968                 }
2969         }
2970
2971         /*
2972          * We previously checked these in the beacon/probe response, so
2973          * they should be present here. This is just a safety net.
2974          */
2975         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2976             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2977                 sdata_info(sdata,
2978                            "HT AP is missing WMM params or HT capability/operation\n");
2979                 ret = false;
2980                 goto out;
2981         }
2982
2983         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2984             (!elems.vht_cap_elem || !elems.vht_operation)) {
2985                 sdata_info(sdata,
2986                            "VHT AP is missing VHT capability/operation\n");
2987                 ret = false;
2988                 goto out;
2989         }
2990
2991         mutex_lock(&sdata->local->sta_mtx);
2992         /*
2993          * station info was already allocated and inserted before
2994          * the association and should be available to us
2995          */
2996         sta = sta_info_get(sdata, cbss->bssid);
2997         if (WARN_ON(!sta)) {
2998                 mutex_unlock(&sdata->local->sta_mtx);
2999                 ret = false;
3000                 goto out;
3001         }
3002
3003         sband = ieee80211_get_sband(sdata);
3004         if (!sband) {
3005                 mutex_unlock(&sdata->local->sta_mtx);
3006                 ret = false;
3007                 goto out;
3008         }
3009
3010         /* Set up internal HT/VHT capabilities */
3011         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3012                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3013                                                   elems.ht_cap_elem, sta);
3014
3015         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3016                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3017                                                     elems.vht_cap_elem, sta);
3018
3019         /*
3020          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3021          * in their association response, so ignore that data for our own
3022          * configuration. If it changed since the last beacon, we'll get the
3023          * next beacon and update then.
3024          */
3025
3026         /*
3027          * If an operating mode notification IE is present, override the
3028          * NSS calculation (that would be done in rate_control_rate_init())
3029          * and use the # of streams from that element.
3030          */
3031         if (elems.opmode_notif &&
3032             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3033                 u8 nss;
3034
3035                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3036                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3037                 nss += 1;
3038                 sta->sta.rx_nss = nss;
3039         }
3040
3041         rate_control_rate_init(sta);
3042
3043         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3044                 set_sta_flag(sta, WLAN_STA_MFP);
3045                 sta->sta.mfp = true;
3046         } else {
3047                 sta->sta.mfp = false;
3048         }
3049
3050         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3051
3052         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3053         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3054                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3055         if (err) {
3056                 sdata_info(sdata,
3057                            "failed to move station %pM to desired state\n",
3058                            sta->sta.addr);
3059                 WARN_ON(__sta_info_destroy(sta));
3060                 mutex_unlock(&sdata->local->sta_mtx);
3061                 ret = false;
3062                 goto out;
3063         }
3064
3065         mutex_unlock(&sdata->local->sta_mtx);
3066
3067         /*
3068          * Always handle WMM once after association regardless
3069          * of the first value the AP uses. Setting -1 here has
3070          * that effect because the AP values is an unsigned
3071          * 4-bit value.
3072          */
3073         ifmgd->wmm_last_param_set = -1;
3074
3075         if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3076                 ieee80211_set_wmm_default(sdata, false, false);
3077         } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3078                                              elems.wmm_param_len)) {
3079                 /* still enable QoS since we might have HT/VHT */
3080                 ieee80211_set_wmm_default(sdata, false, true);
3081                 /* set the disable-WMM flag in this case to disable
3082                  * tracking WMM parameter changes in the beacon if
3083                  * the parameters weren't actually valid. Doing so
3084                  * avoids changing parameters very strangely when
3085                  * the AP is going back and forth between valid and
3086                  * invalid parameters.
3087                  */
3088                 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3089         }
3090         changed |= BSS_CHANGED_QOS;
3091
3092         if (elems.max_idle_period_ie) {
3093                 bss_conf->max_idle_period =
3094                         le16_to_cpu(elems.max_idle_period_ie->max_idle_period);
3095                 bss_conf->protected_keep_alive =
3096                         !!(elems.max_idle_period_ie->idle_options &
3097                            WLAN_IDLE_OPTIONS_PROTECTED_KEEP_ALIVE);
3098                 changed |= BSS_CHANGED_KEEP_ALIVE;
3099         } else {
3100                 bss_conf->max_idle_period = 0;
3101                 bss_conf->protected_keep_alive = false;
3102         }
3103
3104         /* set AID and assoc capability,
3105          * ieee80211_set_associated() will tell the driver */
3106         bss_conf->aid = aid;
3107         bss_conf->assoc_capability = capab_info;
3108         ieee80211_set_associated(sdata, cbss, changed);
3109
3110         /*
3111          * If we're using 4-addr mode, let the AP know that we're
3112          * doing so, so that it can create the STA VLAN on its side
3113          */
3114         if (ifmgd->use_4addr)
3115                 ieee80211_send_4addr_nullfunc(local, sdata);
3116
3117         /*
3118          * Start timer to probe the connection to the AP now.
3119          * Also start the timer that will detect beacon loss.
3120          */
3121         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3122         ieee80211_sta_reset_beacon_monitor(sdata);
3123
3124         ret = true;
3125  out:
3126         kfree(bss_ies);
3127         return ret;
3128 }
3129
3130 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3131                                          struct ieee80211_mgmt *mgmt,
3132                                          size_t len)
3133 {
3134         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3135         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3136         u16 capab_info, status_code, aid;
3137         struct ieee802_11_elems elems;
3138         int ac, uapsd_queues = -1;
3139         u8 *pos;
3140         bool reassoc;
3141         struct cfg80211_bss *bss;
3142         struct ieee80211_event event = {
3143                 .type = MLME_EVENT,
3144                 .u.mlme.data = ASSOC_EVENT,
3145         };
3146
3147         sdata_assert_lock(sdata);
3148
3149         if (!assoc_data)
3150                 return;
3151         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3152                 return;
3153
3154         /*
3155          * AssocResp and ReassocResp have identical structure, so process both
3156          * of them in this function.
3157          */
3158
3159         if (len < 24 + 6)
3160                 return;
3161
3162         reassoc = ieee80211_is_reassoc_resp(mgmt->frame_control);
3163         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3164         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3165         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3166
3167         sdata_info(sdata,
3168                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3169                    reassoc ? "Rea" : "A", mgmt->sa,
3170                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3171
3172         if (assoc_data->fils_kek_len &&
3173             fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
3174                 return;
3175
3176         pos = mgmt->u.assoc_resp.variable;
3177         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3178
3179         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3180             elems.timeout_int &&
3181             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3182                 u32 tu, ms;
3183                 tu = le32_to_cpu(elems.timeout_int->value);
3184                 ms = tu * 1024 / 1000;
3185                 sdata_info(sdata,
3186                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3187                            mgmt->sa, tu, ms);
3188                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3189                 assoc_data->timeout_started = true;
3190                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3191                         run_again(sdata, assoc_data->timeout);
3192                 return;
3193         }
3194
3195         bss = assoc_data->bss;
3196
3197         if (status_code != WLAN_STATUS_SUCCESS) {
3198                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3199                            mgmt->sa, status_code);
3200                 ieee80211_destroy_assoc_data(sdata, false, false);
3201                 event.u.mlme.status = MLME_DENIED;
3202                 event.u.mlme.reason = status_code;
3203                 drv_event_callback(sdata->local, sdata, &event);
3204         } else {
3205                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3206                         /* oops -- internal error -- send timeout for now */
3207                         ieee80211_destroy_assoc_data(sdata, false, false);
3208                         cfg80211_assoc_timeout(sdata->dev, bss);
3209                         return;
3210                 }
3211                 event.u.mlme.status = MLME_SUCCESS;
3212                 drv_event_callback(sdata->local, sdata, &event);
3213                 sdata_info(sdata, "associated\n");
3214
3215                 /*
3216                  * destroy assoc_data afterwards, as otherwise an idle
3217                  * recalc after assoc_data is NULL but before associated
3218                  * is set can cause the interface to go idle
3219                  */
3220                 ieee80211_destroy_assoc_data(sdata, true, false);
3221
3222                 /* get uapsd queues configuration */
3223                 uapsd_queues = 0;
3224                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3225                         if (sdata->tx_conf[ac].uapsd)
3226                                 uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
3227         }
3228
3229         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3230 }
3231
3232 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3233                                   struct ieee80211_mgmt *mgmt, size_t len,
3234                                   struct ieee80211_rx_status *rx_status,
3235                                   struct ieee802_11_elems *elems)
3236 {
3237         struct ieee80211_local *local = sdata->local;
3238         struct ieee80211_bss *bss;
3239         struct ieee80211_channel *channel;
3240
3241         sdata_assert_lock(sdata);
3242
3243         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3244         if (!channel)
3245                 return;
3246
3247         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3248                                         channel);
3249         if (bss) {
3250                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3251                 ieee80211_rx_bss_put(local, bss);
3252         }
3253 }
3254
3255
3256 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3257                                          struct sk_buff *skb)
3258 {
3259         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3260         struct ieee80211_if_managed *ifmgd;
3261         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3262         size_t baselen, len = skb->len;
3263         struct ieee802_11_elems elems;
3264
3265         ifmgd = &sdata->u.mgd;
3266
3267         sdata_assert_lock(sdata);
3268
3269         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3270                 return; /* ignore ProbeResp to foreign address */
3271
3272         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3273         if (baselen > len)
3274                 return;
3275
3276         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3277                                false, &elems);
3278
3279         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3280
3281         if (ifmgd->associated &&
3282             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3283                 ieee80211_reset_ap_probe(sdata);
3284 }
3285
3286 /*
3287  * This is the canonical list of information elements we care about,
3288  * the filter code also gives us all changes to the Microsoft OUI
3289  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3290  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3291  * changes to requested client power.
3292  *
3293  * We implement beacon filtering in software since that means we can
3294  * avoid processing the frame here and in cfg80211, and userspace
3295  * will not be able to tell whether the hardware supports it or not.
3296  *
3297  * XXX: This list needs to be dynamic -- userspace needs to be able to
3298  *      add items it requires. It also needs to be able to tell us to
3299  *      look out for other vendor IEs.
3300  */
3301 static const u64 care_about_ies =
3302         (1ULL << WLAN_EID_COUNTRY) |
3303         (1ULL << WLAN_EID_ERP_INFO) |
3304         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3305         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3306         (1ULL << WLAN_EID_HT_CAPABILITY) |
3307         (1ULL << WLAN_EID_HT_OPERATION) |
3308         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3309
3310 static void ieee80211_handle_beacon_sig(struct ieee80211_sub_if_data *sdata,
3311                                         struct ieee80211_if_managed *ifmgd,
3312                                         struct ieee80211_bss_conf *bss_conf,
3313                                         struct ieee80211_local *local,
3314                                         struct ieee80211_rx_status *rx_status)
3315 {
3316         /* Track average RSSI from the Beacon frames of the current AP */
3317
3318         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3319                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3320                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3321                 ifmgd->last_cqm_event_signal = 0;
3322                 ifmgd->count_beacon_signal = 1;
3323                 ifmgd->last_ave_beacon_signal = 0;
3324         } else {
3325                 ifmgd->count_beacon_signal++;
3326         }
3327
3328         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3329
3330         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3331             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3332                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3333                 int last_sig = ifmgd->last_ave_beacon_signal;
3334                 struct ieee80211_event event = {
3335                         .type = RSSI_EVENT,
3336                 };
3337
3338                 /*
3339                  * if signal crosses either of the boundaries, invoke callback
3340                  * with appropriate parameters
3341                  */
3342                 if (sig > ifmgd->rssi_max_thold &&
3343                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3344                         ifmgd->last_ave_beacon_signal = sig;
3345                         event.u.rssi.data = RSSI_EVENT_HIGH;
3346                         drv_event_callback(local, sdata, &event);
3347                 } else if (sig < ifmgd->rssi_min_thold &&
3348                            (last_sig >= ifmgd->rssi_max_thold ||
3349                            last_sig == 0)) {
3350                         ifmgd->last_ave_beacon_signal = sig;
3351                         event.u.rssi.data = RSSI_EVENT_LOW;
3352                         drv_event_callback(local, sdata, &event);
3353                 }
3354         }
3355
3356         if (bss_conf->cqm_rssi_thold &&
3357             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3358             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3359                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3360                 int last_event = ifmgd->last_cqm_event_signal;
3361                 int thold = bss_conf->cqm_rssi_thold;
3362                 int hyst = bss_conf->cqm_rssi_hyst;
3363
3364                 if (sig < thold &&
3365                     (last_event == 0 || sig < last_event - hyst)) {
3366                         ifmgd->last_cqm_event_signal = sig;
3367                         ieee80211_cqm_rssi_notify(
3368                                 &sdata->vif,
3369                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3370                                 sig, GFP_KERNEL);
3371                 } else if (sig > thold &&
3372                            (last_event == 0 || sig > last_event + hyst)) {
3373                         ifmgd->last_cqm_event_signal = sig;
3374                         ieee80211_cqm_rssi_notify(
3375                                 &sdata->vif,
3376                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3377                                 sig, GFP_KERNEL);
3378                 }
3379         }
3380
3381         if (bss_conf->cqm_rssi_low &&
3382             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3383                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3384                 int last_event = ifmgd->last_cqm_event_signal;
3385                 int low = bss_conf->cqm_rssi_low;
3386                 int high = bss_conf->cqm_rssi_high;
3387
3388                 if (sig < low &&
3389                     (last_event == 0 || last_event >= low)) {
3390                         ifmgd->last_cqm_event_signal = sig;
3391                         ieee80211_cqm_rssi_notify(
3392                                 &sdata->vif,
3393                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3394                                 sig, GFP_KERNEL);
3395                 } else if (sig > high &&
3396                            (last_event == 0 || last_event <= high)) {
3397                         ifmgd->last_cqm_event_signal = sig;
3398                         ieee80211_cqm_rssi_notify(
3399                                 &sdata->vif,
3400                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3401                                 sig, GFP_KERNEL);
3402                 }
3403         }
3404 }
3405
3406 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3407                                      struct ieee80211_mgmt *mgmt, size_t len,
3408                                      struct ieee80211_rx_status *rx_status)
3409 {
3410         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3411         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3412         size_t baselen;
3413         struct ieee802_11_elems elems;
3414         struct ieee80211_local *local = sdata->local;
3415         struct ieee80211_chanctx_conf *chanctx_conf;
3416         struct ieee80211_channel *chan;
3417         struct sta_info *sta;
3418         u32 changed = 0;
3419         bool erp_valid;
3420         u8 erp_value = 0;
3421         u32 ncrc;
3422         u8 *bssid;
3423         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3424
3425         sdata_assert_lock(sdata);
3426
3427         /* Process beacon from the current BSS */
3428         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3429         if (baselen > len)
3430                 return;
3431
3432         rcu_read_lock();
3433         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3434         if (!chanctx_conf) {
3435                 rcu_read_unlock();
3436                 return;
3437         }
3438
3439         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3440                 rcu_read_unlock();
3441                 return;
3442         }
3443         chan = chanctx_conf->def.chan;
3444         rcu_read_unlock();
3445
3446         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3447             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3448                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3449                                        len - baselen, false, &elems);
3450
3451                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3452                 if (elems.tim && !elems.parse_error) {
3453                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3454                         ifmgd->dtim_period = tim_ie->dtim_period;
3455                 }
3456                 ifmgd->have_beacon = true;
3457                 ifmgd->assoc_data->need_beacon = false;
3458                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3459                         sdata->vif.bss_conf.sync_tsf =
3460                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3461                         sdata->vif.bss_conf.sync_device_ts =
3462                                 rx_status->device_timestamp;
3463                         if (elems.tim)
3464                                 sdata->vif.bss_conf.sync_dtim_count =
3465                                         elems.tim->dtim_count;
3466                         else
3467                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3468                 }
3469                 /* continue assoc process */
3470                 ifmgd->assoc_data->timeout = jiffies;
3471                 ifmgd->assoc_data->timeout_started = true;
3472                 run_again(sdata, ifmgd->assoc_data->timeout);
3473                 return;
3474         }
3475
3476         if (!ifmgd->associated ||
3477             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3478                 return;
3479         bssid = ifmgd->associated->bssid;
3480
3481         if (!(rx_status->flag & RX_FLAG_NO_SIGNAL_VAL))
3482                 ieee80211_handle_beacon_sig(sdata, ifmgd, bss_conf,
3483                                             local, rx_status);
3484
3485         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3486                 mlme_dbg_ratelimited(sdata,
3487                                      "cancelling AP probe due to a received beacon\n");
3488                 ieee80211_reset_ap_probe(sdata);
3489         }
3490
3491         /*
3492          * Push the beacon loss detection into the future since
3493          * we are processing a beacon from the AP just now.
3494          */
3495         ieee80211_sta_reset_beacon_monitor(sdata);
3496
3497         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3498         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3499                                           len - baselen, false, &elems,
3500                                           care_about_ies, ncrc);
3501
3502         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3503             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3504                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3505                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3506                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3507                                 ieee80211_hw_config(local,
3508                                                     IEEE80211_CONF_CHANGE_PS);
3509                         }
3510                         ieee80211_send_nullfunc(local, sdata, false);
3511                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3512                         local->pspolling = true;
3513
3514                         /*
3515                          * Here is assumed that the driver will be
3516                          * able to send ps-poll frame and receive a
3517                          * response even though power save mode is
3518                          * enabled, but some drivers might require
3519                          * to disable power save here. This needs
3520                          * to be investigated.
3521                          */
3522                         ieee80211_send_pspoll(local, sdata);
3523                 }
3524         }
3525
3526         if (sdata->vif.p2p ||
3527             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3528                 struct ieee80211_p2p_noa_attr noa = {};
3529                 int ret;
3530
3531                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3532                                             len - baselen,
3533                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3534                                             (u8 *) &noa, sizeof(noa));
3535                 if (ret >= 2) {
3536                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3537                                 /* valid noa_attr and index changed */
3538                                 sdata->u.mgd.p2p_noa_index = noa.index;
3539                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3540                                 changed |= BSS_CHANGED_P2P_PS;
3541                                 /*
3542                                  * make sure we update all information, the CRC
3543                                  * mechanism doesn't look at P2P attributes.
3544                                  */
3545                                 ifmgd->beacon_crc_valid = false;
3546                         }
3547                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3548                         /* noa_attr not found and we had valid noa_attr before */
3549                         sdata->u.mgd.p2p_noa_index = -1;
3550                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3551                         changed |= BSS_CHANGED_P2P_PS;
3552                         ifmgd->beacon_crc_valid = false;
3553                 }
3554         }
3555
3556         if (ifmgd->csa_waiting_bcn)
3557                 ieee80211_chswitch_post_beacon(sdata);
3558
3559         /*
3560          * Update beacon timing and dtim count on every beacon appearance. This
3561          * will allow the driver to use the most updated values. Do it before
3562          * comparing this one with last received beacon.
3563          * IMPORTANT: These parameters would possibly be out of sync by the time
3564          * the driver will use them. The synchronized view is currently
3565          * guaranteed only in certain callbacks.
3566          */
3567         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3568                 sdata->vif.bss_conf.sync_tsf =
3569                         le64_to_cpu(mgmt->u.beacon.timestamp);
3570                 sdata->vif.bss_conf.sync_device_ts =
3571                         rx_status->device_timestamp;
3572                 if (elems.tim)
3573                         sdata->vif.bss_conf.sync_dtim_count =
3574                                 elems.tim->dtim_count;
3575                 else
3576                         sdata->vif.bss_conf.sync_dtim_count = 0;
3577         }
3578
3579         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3580                 return;
3581         ifmgd->beacon_crc = ncrc;
3582         ifmgd->beacon_crc_valid = true;
3583
3584         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3585
3586         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3587                                          rx_status->device_timestamp,
3588                                          &elems, true);
3589
3590         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3591             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3592                                      elems.wmm_param_len))
3593                 changed |= BSS_CHANGED_QOS;
3594
3595         /*
3596          * If we haven't had a beacon before, tell the driver about the
3597          * DTIM period (and beacon timing if desired) now.
3598          */
3599         if (!ifmgd->have_beacon) {
3600                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3601                 if (elems.tim)
3602                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3603                 else
3604                         bss_conf->dtim_period = 1;
3605
3606                 changed |= BSS_CHANGED_BEACON_INFO;
3607                 ifmgd->have_beacon = true;
3608
3609                 mutex_lock(&local->iflist_mtx);
3610                 ieee80211_recalc_ps(local);
3611                 mutex_unlock(&local->iflist_mtx);
3612
3613                 ieee80211_recalc_ps_vif(sdata);
3614         }
3615
3616         if (elems.erp_info) {
3617                 erp_valid = true;
3618                 erp_value = elems.erp_info[0];
3619         } else {
3620                 erp_valid = false;
3621         }
3622         changed |= ieee80211_handle_bss_capability(sdata,
3623                         le16_to_cpu(mgmt->u.beacon.capab_info),
3624                         erp_valid, erp_value);
3625
3626         mutex_lock(&local->sta_mtx);
3627         sta = sta_info_get(sdata, bssid);
3628
3629         if (ieee80211_config_bw(sdata, sta,
3630                                 elems.ht_cap_elem, elems.ht_operation,
3631                                 elems.vht_operation, bssid, &changed)) {
3632                 mutex_unlock(&local->sta_mtx);
3633                 sdata_info(sdata,
3634                            "failed to follow AP %pM bandwidth change, disconnect\n",
3635                            bssid);
3636                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3637                                        WLAN_REASON_DEAUTH_LEAVING,
3638                                        true, deauth_buf);
3639                 ieee80211_report_disconnect(sdata, deauth_buf,
3640                                             sizeof(deauth_buf), true,
3641                                             WLAN_REASON_DEAUTH_LEAVING);
3642                 return;
3643         }
3644
3645         if (sta && elems.opmode_notif)
3646                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3647                                             rx_status->band);
3648         mutex_unlock(&local->sta_mtx);
3649
3650         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3651                                                elems.country_elem,
3652                                                elems.country_elem_len,
3653                                                elems.pwr_constr_elem,
3654                                                elems.cisco_dtpc_elem);
3655
3656         ieee80211_bss_info_change_notify(sdata, changed);
3657 }
3658
3659 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3660                                   struct sk_buff *skb)
3661 {
3662         struct ieee80211_rx_status *rx_status;
3663         struct ieee80211_mgmt *mgmt;
3664         u16 fc;
3665         struct ieee802_11_elems elems;
3666         int ies_len;
3667
3668         rx_status = (struct ieee80211_rx_status *) skb->cb;
3669         mgmt = (struct ieee80211_mgmt *) skb->data;
3670         fc = le16_to_cpu(mgmt->frame_control);
3671
3672         sdata_lock(sdata);
3673
3674         switch (fc & IEEE80211_FCTL_STYPE) {
3675         case IEEE80211_STYPE_BEACON:
3676                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3677                 break;
3678         case IEEE80211_STYPE_PROBE_RESP:
3679                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3680                 break;
3681         case IEEE80211_STYPE_AUTH:
3682                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3683                 break;
3684         case IEEE80211_STYPE_DEAUTH:
3685                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3686                 break;
3687         case IEEE80211_STYPE_DISASSOC:
3688                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3689                 break;
3690         case IEEE80211_STYPE_ASSOC_RESP:
3691         case IEEE80211_STYPE_REASSOC_RESP:
3692                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3693                 break;
3694         case IEEE80211_STYPE_ACTION:
3695                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3696                         ies_len = skb->len -
3697                                   offsetof(struct ieee80211_mgmt,
3698                                            u.action.u.chan_switch.variable);
3699
3700                         if (ies_len < 0)
3701                                 break;
3702
3703                         ieee802_11_parse_elems(
3704                                 mgmt->u.action.u.chan_switch.variable,
3705                                 ies_len, true, &elems);
3706
3707                         if (elems.parse_error)
3708                                 break;
3709
3710                         ieee80211_sta_process_chanswitch(sdata,
3711                                                  rx_status->mactime,
3712                                                  rx_status->device_timestamp,
3713                                                  &elems, false);
3714                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3715                         ies_len = skb->len -
3716                                   offsetof(struct ieee80211_mgmt,
3717                                            u.action.u.ext_chan_switch.variable);
3718
3719                         if (ies_len < 0)
3720                                 break;
3721
3722                         ieee802_11_parse_elems(
3723                                 mgmt->u.action.u.ext_chan_switch.variable,
3724                                 ies_len, true, &elems);
3725
3726                         if (elems.parse_error)
3727                                 break;
3728
3729                         /* for the handling code pretend this was also an IE */
3730                         elems.ext_chansw_ie =
3731                                 &mgmt->u.action.u.ext_chan_switch.data;
3732
3733                         ieee80211_sta_process_chanswitch(sdata,
3734                                                  rx_status->mactime,
3735                                                  rx_status->device_timestamp,
3736                                                  &elems, false);
3737                 }
3738                 break;
3739         }
3740         sdata_unlock(sdata);
3741 }
3742
3743 static void ieee80211_sta_timer(struct timer_list *t)
3744 {
3745         struct ieee80211_sub_if_data *sdata =
3746                 from_timer(sdata, t, u.mgd.timer);
3747
3748         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3749 }
3750
3751 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3752                                           u8 *bssid, u8 reason, bool tx)
3753 {
3754         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3755
3756         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3757                                tx, frame_buf);
3758
3759         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3760                                     reason);
3761 }
3762
3763 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3764 {
3765         struct ieee80211_local *local = sdata->local;
3766         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3767         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3768         u32 tx_flags = 0;
3769         u16 trans = 1;
3770         u16 status = 0;
3771
3772         sdata_assert_lock(sdata);
3773
3774         if (WARN_ON_ONCE(!auth_data))
3775                 return -EINVAL;
3776
3777         auth_data->tries++;
3778
3779         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3780                 sdata_info(sdata, "authentication with %pM timed out\n",
3781                            auth_data->bss->bssid);
3782
3783                 /*
3784                  * Most likely AP is not in the range so remove the
3785                  * bss struct for that AP.
3786                  */
3787                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3788
3789                 return -ETIMEDOUT;
3790         }
3791
3792         drv_mgd_prepare_tx(local, sdata);
3793
3794         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3795                    auth_data->bss->bssid, auth_data->tries,
3796                    IEEE80211_AUTH_MAX_TRIES);
3797
3798         auth_data->expected_transaction = 2;
3799
3800         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3801                 trans = auth_data->sae_trans;
3802                 status = auth_data->sae_status;
3803                 auth_data->expected_transaction = trans;
3804         }
3805
3806         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3807                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3808                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3809
3810         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3811                             auth_data->data, auth_data->data_len,
3812                             auth_data->bss->bssid,
3813                             auth_data->bss->bssid, NULL, 0, 0,
3814                             tx_flags);
3815
3816         if (tx_flags == 0) {
3817                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3818                 auth_data->timeout_started = true;
3819                 run_again(sdata, auth_data->timeout);
3820         } else {
3821                 auth_data->timeout =
3822                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3823                 auth_data->timeout_started = true;
3824                 run_again(sdata, auth_data->timeout);
3825         }
3826
3827         return 0;
3828 }
3829
3830 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3831 {
3832         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3833         struct ieee80211_local *local = sdata->local;
3834
3835         sdata_assert_lock(sdata);
3836
3837         assoc_data->tries++;
3838         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3839                 sdata_info(sdata, "association with %pM timed out\n",
3840                            assoc_data->bss->bssid);
3841
3842                 /*
3843                  * Most likely AP is not in the range so remove the
3844                  * bss struct for that AP.
3845                  */
3846                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3847
3848                 return -ETIMEDOUT;
3849         }
3850
3851         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3852                    assoc_data->bss->bssid, assoc_data->tries,
3853                    IEEE80211_ASSOC_MAX_TRIES);
3854         ieee80211_send_assoc(sdata);
3855
3856         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3857                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3858                 assoc_data->timeout_started = true;
3859                 run_again(sdata, assoc_data->timeout);
3860         } else {
3861                 assoc_data->timeout =
3862                         round_jiffies_up(jiffies +
3863                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3864                 assoc_data->timeout_started = true;
3865                 run_again(sdata, assoc_data->timeout);
3866         }
3867
3868         return 0;
3869 }
3870
3871 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3872                                   __le16 fc, bool acked)
3873 {
3874         struct ieee80211_local *local = sdata->local;
3875
3876         sdata->u.mgd.status_fc = fc;
3877         sdata->u.mgd.status_acked = acked;
3878         sdata->u.mgd.status_received = true;
3879
3880         ieee80211_queue_work(&local->hw, &sdata->work);
3881 }
3882
3883 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3884 {
3885         struct ieee80211_local *local = sdata->local;
3886         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3887
3888         sdata_lock(sdata);
3889
3890         if (ifmgd->status_received) {
3891                 __le16 fc = ifmgd->status_fc;
3892                 bool status_acked = ifmgd->status_acked;
3893
3894                 ifmgd->status_received = false;
3895                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3896                         if (status_acked) {
3897                                 ifmgd->auth_data->timeout =
3898                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3899                                 run_again(sdata, ifmgd->auth_data->timeout);
3900                         } else {
3901                                 ifmgd->auth_data->timeout = jiffies - 1;
3902                         }
3903                         ifmgd->auth_data->timeout_started = true;
3904                 } else if (ifmgd->assoc_data &&
3905                            (ieee80211_is_assoc_req(fc) ||
3906                             ieee80211_is_reassoc_req(fc))) {
3907                         if (status_acked) {
3908                                 ifmgd->assoc_data->timeout =
3909                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3910                                 run_again(sdata, ifmgd->assoc_data->timeout);
3911                         } else {
3912                                 ifmgd->assoc_data->timeout = jiffies - 1;
3913                         }
3914                         ifmgd->assoc_data->timeout_started = true;
3915                 }
3916         }
3917
3918         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3919             time_after(jiffies, ifmgd->auth_data->timeout)) {
3920                 if (ifmgd->auth_data->done) {
3921                         /*
3922                          * ok ... we waited for assoc but userspace didn't,
3923                          * so let's just kill the auth data
3924                          */
3925                         ieee80211_destroy_auth_data(sdata, false);
3926                 } else if (ieee80211_auth(sdata)) {
3927                         u8 bssid[ETH_ALEN];
3928                         struct ieee80211_event event = {
3929                                 .type = MLME_EVENT,
3930                                 .u.mlme.data = AUTH_EVENT,
3931                                 .u.mlme.status = MLME_TIMEOUT,
3932                         };
3933
3934                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3935
3936                         ieee80211_destroy_auth_data(sdata, false);
3937
3938                         cfg80211_auth_timeout(sdata->dev, bssid);
3939                         drv_event_callback(sdata->local, sdata, &event);
3940                 }
3941         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3942                 run_again(sdata, ifmgd->auth_data->timeout);
3943
3944         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3945             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3946                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3947                     ieee80211_do_assoc(sdata)) {
3948                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3949                         struct ieee80211_event event = {
3950                                 .type = MLME_EVENT,
3951                                 .u.mlme.data = ASSOC_EVENT,
3952                                 .u.mlme.status = MLME_TIMEOUT,
3953                         };
3954
3955                         ieee80211_destroy_assoc_data(sdata, false, false);
3956                         cfg80211_assoc_timeout(sdata->dev, bss);
3957                         drv_event_callback(sdata->local, sdata, &event);
3958                 }
3959         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3960                 run_again(sdata, ifmgd->assoc_data->timeout);
3961
3962         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3963             ifmgd->associated) {
3964                 u8 bssid[ETH_ALEN];
3965                 int max_tries;
3966
3967                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3968
3969                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3970                         max_tries = max_nullfunc_tries;
3971                 else
3972                         max_tries = max_probe_tries;
3973
3974                 /* ACK received for nullfunc probing frame */
3975                 if (!ifmgd->probe_send_count)
3976                         ieee80211_reset_ap_probe(sdata);
3977                 else if (ifmgd->nullfunc_failed) {
3978                         if (ifmgd->probe_send_count < max_tries) {
3979                                 mlme_dbg(sdata,
3980                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3981                                          bssid, ifmgd->probe_send_count,
3982                                          max_tries);
3983                                 ieee80211_mgd_probe_ap_send(sdata);
3984                         } else {
3985                                 mlme_dbg(sdata,
3986                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3987                                          bssid);
3988                                 ieee80211_sta_connection_lost(sdata, bssid,
3989                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3990                                         false);
3991                         }
3992                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3993                         run_again(sdata, ifmgd->probe_timeout);
3994                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3995                         mlme_dbg(sdata,
3996                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3997                                  bssid, probe_wait_ms);
3998                         ieee80211_sta_connection_lost(sdata, bssid,
3999                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4000                 } else if (ifmgd->probe_send_count < max_tries) {
4001                         mlme_dbg(sdata,
4002                                  "No probe response from AP %pM after %dms, try %d/%i\n",
4003                                  bssid, probe_wait_ms,
4004                                  ifmgd->probe_send_count, max_tries);
4005                         ieee80211_mgd_probe_ap_send(sdata);
4006                 } else {
4007                         /*
4008                          * We actually lost the connection ... or did we?
4009                          * Let's make sure!
4010                          */
4011                         mlme_dbg(sdata,
4012                                  "No probe response from AP %pM after %dms, disconnecting.\n",
4013                                  bssid, probe_wait_ms);
4014
4015                         ieee80211_sta_connection_lost(sdata, bssid,
4016                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4017                 }
4018         }
4019
4020         sdata_unlock(sdata);
4021 }
4022
4023 static void ieee80211_sta_bcn_mon_timer(struct timer_list *t)
4024 {
4025         struct ieee80211_sub_if_data *sdata =
4026                 from_timer(sdata, t, u.mgd.bcn_mon_timer);
4027         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4028
4029         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4030                 return;
4031
4032         sdata->u.mgd.connection_loss = false;
4033         ieee80211_queue_work(&sdata->local->hw,
4034                              &sdata->u.mgd.beacon_connection_loss_work);
4035 }
4036
4037 static void ieee80211_sta_conn_mon_timer(struct timer_list *t)
4038 {
4039         struct ieee80211_sub_if_data *sdata =
4040                 from_timer(sdata, t, u.mgd.conn_mon_timer);
4041         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4042         struct ieee80211_local *local = sdata->local;
4043
4044         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4045                 return;
4046
4047         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4048 }
4049
4050 static void ieee80211_sta_monitor_work(struct work_struct *work)
4051 {
4052         struct ieee80211_sub_if_data *sdata =
4053                 container_of(work, struct ieee80211_sub_if_data,
4054                              u.mgd.monitor_work);
4055
4056         ieee80211_mgd_probe_ap(sdata, false);
4057 }
4058
4059 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4060 {
4061         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4062                 __ieee80211_stop_poll(sdata);
4063
4064                 /* let's probe the connection once */
4065                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4066                         ieee80211_queue_work(&sdata->local->hw,
4067                                              &sdata->u.mgd.monitor_work);
4068         }
4069 }
4070
4071 #ifdef CONFIG_PM
4072 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4073 {
4074         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4075         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4076
4077         sdata_lock(sdata);
4078
4079         if (ifmgd->auth_data || ifmgd->assoc_data) {
4080                 const u8 *bssid = ifmgd->auth_data ?
4081                                 ifmgd->auth_data->bss->bssid :
4082                                 ifmgd->assoc_data->bss->bssid;
4083
4084                 /*
4085                  * If we are trying to authenticate / associate while suspending,
4086                  * cfg80211 won't know and won't actually abort those attempts,
4087                  * thus we need to do that ourselves.
4088                  */
4089                 ieee80211_send_deauth_disassoc(sdata, bssid,
4090                                                IEEE80211_STYPE_DEAUTH,
4091                                                WLAN_REASON_DEAUTH_LEAVING,
4092                                                false, frame_buf);
4093                 if (ifmgd->assoc_data)
4094                         ieee80211_destroy_assoc_data(sdata, false, true);
4095                 if (ifmgd->auth_data)
4096                         ieee80211_destroy_auth_data(sdata, false);
4097                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4098                                       IEEE80211_DEAUTH_FRAME_LEN);
4099         }
4100
4101         /* This is a bit of a hack - we should find a better and more generic
4102          * solution to this. Normally when suspending, cfg80211 will in fact
4103          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4104          * auth (not so important) or assoc (this is the problem) process.
4105          *
4106          * As a consequence, it can happen that we are in the process of both
4107          * associating and suspending, and receive an association response
4108          * after cfg80211 has checked if it needs to disconnect, but before
4109          * we actually set the flag to drop incoming frames. This will then
4110          * cause the workqueue flush to process the association response in
4111          * the suspend, resulting in a successful association just before it
4112          * tries to remove the interface from the driver, which now though
4113          * has a channel context assigned ... this results in issues.
4114          *
4115          * To work around this (for now) simply deauth here again if we're
4116          * now connected.
4117          */
4118         if (ifmgd->associated && !sdata->local->wowlan) {
4119                 u8 bssid[ETH_ALEN];
4120                 struct cfg80211_deauth_request req = {
4121                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4122                         .bssid = bssid,
4123                 };
4124
4125                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4126                 ieee80211_mgd_deauth(sdata, &req);
4127         }
4128
4129         sdata_unlock(sdata);
4130 }
4131
4132 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4133 {
4134         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4135
4136         sdata_lock(sdata);
4137         if (!ifmgd->associated) {
4138                 sdata_unlock(sdata);
4139                 return;
4140         }
4141
4142         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4143                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4144                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4145                 ieee80211_sta_connection_lost(sdata,
4146                                               ifmgd->associated->bssid,
4147                                               WLAN_REASON_UNSPECIFIED,
4148                                               true);
4149                 sdata_unlock(sdata);
4150                 return;
4151         }
4152         sdata_unlock(sdata);
4153 }
4154 #endif
4155
4156 /* interface setup */
4157 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4158 {
4159         struct ieee80211_if_managed *ifmgd;
4160
4161         ifmgd = &sdata->u.mgd;
4162         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4163         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4164         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4165                   ieee80211_beacon_connection_loss_work);
4166         INIT_WORK(&ifmgd->csa_connection_drop_work,
4167                   ieee80211_csa_connection_drop_work);
4168         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4169         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4170                           ieee80211_tdls_peer_del_work);
4171         timer_setup(&ifmgd->timer, ieee80211_sta_timer, 0);
4172         timer_setup(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer, 0);
4173         timer_setup(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer, 0);
4174         timer_setup(&ifmgd->chswitch_timer, ieee80211_chswitch_timer, 0);
4175         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4176                           ieee80211_sta_handle_tspec_ac_params_wk);
4177
4178         ifmgd->flags = 0;
4179         ifmgd->powersave = sdata->wdev.ps;
4180         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4181         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4182         ifmgd->p2p_noa_index = -1;
4183
4184         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4185                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4186         else
4187                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4188
4189         /* Setup TDLS data */
4190         spin_lock_init(&ifmgd->teardown_lock);
4191         ifmgd->teardown_skb = NULL;
4192         ifmgd->orig_teardown_skb = NULL;
4193 }
4194
4195 /* scan finished notification */
4196 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4197 {
4198         struct ieee80211_sub_if_data *sdata;
4199
4200         /* Restart STA timers */
4201         rcu_read_lock();
4202         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4203                 if (ieee80211_sdata_running(sdata))
4204                         ieee80211_restart_sta_timer(sdata);
4205         }
4206         rcu_read_unlock();
4207 }
4208
4209 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4210                                      struct cfg80211_bss *cbss)
4211 {
4212         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4213         const u8 *ht_cap_ie, *vht_cap_ie;
4214         const struct ieee80211_ht_cap *ht_cap;
4215         const struct ieee80211_vht_cap *vht_cap;
4216         u8 chains = 1;
4217
4218         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4219                 return chains;
4220
4221         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4222         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4223                 ht_cap = (void *)(ht_cap_ie + 2);
4224                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4225                 /*
4226                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4227                  *       "Tx Unequal Modulation Supported" fields.
4228                  */
4229         }
4230
4231         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4232                 return chains;
4233
4234         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4235         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4236                 u8 nss;
4237                 u16 tx_mcs_map;
4238
4239                 vht_cap = (void *)(vht_cap_ie + 2);
4240                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4241                 for (nss = 8; nss > 0; nss--) {
4242                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4243                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4244                                 break;
4245                 }
4246                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4247                 chains = max(chains, nss);
4248         }
4249
4250         return chains;
4251 }
4252
4253 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4254                                   struct cfg80211_bss *cbss)
4255 {
4256         struct ieee80211_local *local = sdata->local;
4257         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4258         const struct ieee80211_ht_cap *ht_cap = NULL;
4259         const struct ieee80211_ht_operation *ht_oper = NULL;
4260         const struct ieee80211_vht_operation *vht_oper = NULL;
4261         struct ieee80211_supported_band *sband;
4262         struct cfg80211_chan_def chandef;
4263         int ret;
4264         u32 i;
4265         bool have_80mhz;
4266
4267         sband = local->hw.wiphy->bands[cbss->channel->band];
4268
4269         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4270                           IEEE80211_STA_DISABLE_80P80MHZ |
4271                           IEEE80211_STA_DISABLE_160MHZ);
4272
4273         rcu_read_lock();
4274
4275         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4276             sband->ht_cap.ht_supported) {
4277                 const u8 *ht_oper_ie, *ht_cap_ie;
4278
4279                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4280                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4281                         ht_oper = (void *)(ht_oper_ie + 2);
4282
4283                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4284                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4285                         ht_cap = (void *)(ht_cap_ie + 2);
4286
4287                 if (!ht_cap) {
4288                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4289                         ht_oper = NULL;
4290                 }
4291         }
4292
4293         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4294             sband->vht_cap.vht_supported) {
4295                 const u8 *vht_oper_ie, *vht_cap;
4296
4297                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4298                                                    WLAN_EID_VHT_OPERATION);
4299                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4300                         vht_oper = (void *)(vht_oper_ie + 2);
4301                 if (vht_oper && !ht_oper) {
4302                         vht_oper = NULL;
4303                         sdata_info(sdata,
4304                                    "AP advertised VHT without HT, disabling both\n");
4305                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4306                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4307                 }
4308
4309                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4310                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4311                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4312                         vht_oper = NULL;
4313                 }
4314         }
4315
4316         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4317         have_80mhz = false;
4318         for (i = 0; i < sband->n_channels; i++) {
4319                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4320                                                 IEEE80211_CHAN_NO_80MHZ))
4321                         continue;
4322
4323                 have_80mhz = true;
4324                 break;
4325         }
4326
4327         if (!have_80mhz)
4328                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4329
4330         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4331                                                      cbss->channel,
4332                                                      ht_oper, vht_oper,
4333                                                      &chandef, false);
4334
4335         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4336                                       local->rx_chains);
4337
4338         rcu_read_unlock();
4339
4340         /* will change later if needed */
4341         sdata->smps_mode = IEEE80211_SMPS_OFF;
4342
4343         mutex_lock(&local->mtx);
4344         /*
4345          * If this fails (possibly due to channel context sharing
4346          * on incompatible channels, e.g. 80+80 and 160 sharing the
4347          * same control channel) try to use a smaller bandwidth.
4348          */
4349         ret = ieee80211_vif_use_channel(sdata, &chandef,
4350                                         IEEE80211_CHANCTX_SHARED);
4351
4352         /* don't downgrade for 5 and 10 MHz channels, though. */
4353         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4354             chandef.width == NL80211_CHAN_WIDTH_10)
4355                 goto out;
4356
4357         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4358                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4359                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4360                                                 IEEE80211_CHANCTX_SHARED);
4361         }
4362  out:
4363         mutex_unlock(&local->mtx);
4364         return ret;
4365 }
4366
4367 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4368                                      struct cfg80211_bss *cbss, bool assoc,
4369                                      bool override)
4370 {
4371         struct ieee80211_local *local = sdata->local;
4372         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4373         struct ieee80211_bss *bss = (void *)cbss->priv;
4374         struct sta_info *new_sta = NULL;
4375         struct ieee80211_supported_band *sband;
4376         bool have_sta = false;
4377         int err;
4378
4379         sband = local->hw.wiphy->bands[cbss->channel->band];
4380
4381         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4382                 return -EINVAL;
4383
4384         /* If a reconfig is happening, bail out */
4385         if (local->in_reconfig)
4386                 return -EBUSY;
4387
4388         if (assoc) {
4389                 rcu_read_lock();
4390                 have_sta = sta_info_get(sdata, cbss->bssid);
4391                 rcu_read_unlock();
4392         }
4393
4394         if (!have_sta) {
4395                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4396                 if (!new_sta)
4397                         return -ENOMEM;
4398         }
4399
4400         /*
4401          * Set up the information for the new channel before setting the
4402          * new channel. We can't - completely race-free - change the basic
4403          * rates bitmap and the channel (sband) that it refers to, but if
4404          * we set it up before we at least avoid calling into the driver's
4405          * bss_info_changed() method with invalid information (since we do
4406          * call that from changing the channel - only for IDLE and perhaps
4407          * some others, but ...).
4408          *
4409          * So to avoid that, just set up all the new information before the
4410          * channel, but tell the driver to apply it only afterwards, since
4411          * it might need the new channel for that.
4412          */
4413         if (new_sta) {
4414                 u32 rates = 0, basic_rates = 0;
4415                 bool have_higher_than_11mbit;
4416                 int min_rate = INT_MAX, min_rate_index = -1;
4417                 const struct cfg80211_bss_ies *ies;
4418                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4419
4420                 ieee80211_get_rates(sband, bss->supp_rates,
4421                                     bss->supp_rates_len,
4422                                     &rates, &basic_rates,
4423                                     &have_higher_than_11mbit,
4424                                     &min_rate, &min_rate_index,
4425                                     shift);
4426
4427                 /*
4428                  * This used to be a workaround for basic rates missing
4429                  * in the association response frame. Now that we no
4430                  * longer use the basic rates from there, it probably
4431                  * doesn't happen any more, but keep the workaround so
4432                  * in case some *other* APs are buggy in different ways
4433                  * we can connect -- with a warning.
4434                  */
4435                 if (!basic_rates && min_rate_index >= 0) {
4436                         sdata_info(sdata,
4437                                    "No basic rates, using min rate instead\n");
4438                         basic_rates = BIT(min_rate_index);
4439                 }
4440
4441                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4442                 sdata->vif.bss_conf.basic_rates = basic_rates;
4443
4444                 /* cf. IEEE 802.11 9.2.12 */
4445                 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4446                     have_higher_than_11mbit)
4447                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4448                 else
4449                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4450
4451                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4452
4453                 /* set timing information */
4454                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4455                 rcu_read_lock();
4456                 ies = rcu_dereference(cbss->beacon_ies);
4457                 if (ies) {
4458                         const u8 *tim_ie;
4459
4460                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4461                         sdata->vif.bss_conf.sync_device_ts =
4462                                 bss->device_ts_beacon;
4463                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4464                                                   ies->data, ies->len);
4465                         if (tim_ie && tim_ie[1] >= 2)
4466                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4467                         else
4468                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4469                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4470                                                TIMING_BEACON_ONLY)) {
4471                         ies = rcu_dereference(cbss->proberesp_ies);
4472                         /* must be non-NULL since beacon IEs were NULL */
4473                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4474                         sdata->vif.bss_conf.sync_device_ts =
4475                                 bss->device_ts_presp;
4476                         sdata->vif.bss_conf.sync_dtim_count = 0;
4477                 } else {
4478                         sdata->vif.bss_conf.sync_tsf = 0;
4479                         sdata->vif.bss_conf.sync_device_ts = 0;
4480                         sdata->vif.bss_conf.sync_dtim_count = 0;
4481                 }
4482                 rcu_read_unlock();
4483         }
4484
4485         if (new_sta || override) {
4486                 err = ieee80211_prep_channel(sdata, cbss);
4487                 if (err) {
4488                         if (new_sta)
4489                                 sta_info_free(local, new_sta);
4490                         return -EINVAL;
4491                 }
4492         }
4493
4494         if (new_sta) {
4495                 /*
4496                  * tell driver about BSSID, basic rates and timing
4497                  * this was set up above, before setting the channel
4498                  */
4499                 ieee80211_bss_info_change_notify(sdata,
4500                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4501                         BSS_CHANGED_BEACON_INT);
4502
4503                 if (assoc)
4504                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4505
4506                 err = sta_info_insert(new_sta);
4507                 new_sta = NULL;
4508                 if (err) {
4509                         sdata_info(sdata,
4510                                    "failed to insert STA entry for the AP (error %d)\n",
4511                                    err);
4512                         return err;
4513                 }
4514         } else
4515                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4516
4517         /* Cancel scan to ensure that nothing interferes with connection */
4518         if (local->scanning)
4519                 ieee80211_scan_cancel(local);
4520
4521         return 0;
4522 }
4523
4524 /* config hooks */
4525 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4526                        struct cfg80211_auth_request *req)
4527 {
4528         struct ieee80211_local *local = sdata->local;
4529         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4530         struct ieee80211_mgd_auth_data *auth_data;
4531         u16 auth_alg;
4532         int err;
4533
4534         /* prepare auth data structure */
4535
4536         switch (req->auth_type) {
4537         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4538                 auth_alg = WLAN_AUTH_OPEN;
4539                 break;
4540         case NL80211_AUTHTYPE_SHARED_KEY:
4541                 if (IS_ERR(local->wep_tx_tfm))
4542                         return -EOPNOTSUPP;
4543                 auth_alg = WLAN_AUTH_SHARED_KEY;
4544                 break;
4545         case NL80211_AUTHTYPE_FT:
4546                 auth_alg = WLAN_AUTH_FT;
4547                 break;
4548         case NL80211_AUTHTYPE_NETWORK_EAP:
4549                 auth_alg = WLAN_AUTH_LEAP;
4550                 break;
4551         case NL80211_AUTHTYPE_SAE:
4552                 auth_alg = WLAN_AUTH_SAE;
4553                 break;
4554         case NL80211_AUTHTYPE_FILS_SK:
4555                 auth_alg = WLAN_AUTH_FILS_SK;
4556                 break;
4557         case NL80211_AUTHTYPE_FILS_SK_PFS:
4558                 auth_alg = WLAN_AUTH_FILS_SK_PFS;
4559                 break;
4560         case NL80211_AUTHTYPE_FILS_PK:
4561                 auth_alg = WLAN_AUTH_FILS_PK;
4562                 break;
4563         default:
4564                 return -EOPNOTSUPP;
4565         }
4566
4567         auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4568                             req->ie_len, GFP_KERNEL);
4569         if (!auth_data)
4570                 return -ENOMEM;
4571
4572         auth_data->bss = req->bss;
4573
4574         if (req->auth_data_len >= 4) {
4575                 if (req->auth_type == NL80211_AUTHTYPE_SAE) {
4576                         __le16 *pos = (__le16 *) req->auth_data;
4577
4578                         auth_data->sae_trans = le16_to_cpu(pos[0]);
4579                         auth_data->sae_status = le16_to_cpu(pos[1]);
4580                 }
4581                 memcpy(auth_data->data, req->auth_data + 4,
4582                        req->auth_data_len - 4);
4583                 auth_data->data_len += req->auth_data_len - 4;
4584         }
4585
4586         if (req->ie && req->ie_len) {
4587                 memcpy(&auth_data->data[auth_data->data_len],
4588                        req->ie, req->ie_len);
4589                 auth_data->data_len += req->ie_len;
4590         }
4591
4592         if (req->key && req->key_len) {
4593                 auth_data->key_len = req->key_len;
4594                 auth_data->key_idx = req->key_idx;
4595                 memcpy(auth_data->key, req->key, req->key_len);
4596         }
4597
4598         auth_data->algorithm = auth_alg;
4599
4600         /* try to authenticate/probe */
4601
4602         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4603             ifmgd->assoc_data) {
4604                 err = -EBUSY;
4605                 goto err_free;
4606         }
4607
4608         if (ifmgd->auth_data)
4609                 ieee80211_destroy_auth_data(sdata, false);
4610
4611         /* prep auth_data so we don't go into idle on disassoc */
4612         ifmgd->auth_data = auth_data;
4613
4614         if (ifmgd->associated) {
4615                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4616
4617                 sdata_info(sdata,
4618                            "disconnect from AP %pM for new auth to %pM\n",
4619                            ifmgd->associated->bssid, req->bss->bssid);
4620                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4621                                        WLAN_REASON_UNSPECIFIED,
4622                                        false, frame_buf);
4623
4624                 ieee80211_report_disconnect(sdata, frame_buf,
4625                                             sizeof(frame_buf), true,
4626                                             WLAN_REASON_UNSPECIFIED);
4627         }
4628
4629         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4630
4631         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4632         if (err)
4633                 goto err_clear;
4634
4635         err = ieee80211_auth(sdata);
4636         if (err) {
4637                 sta_info_destroy_addr(sdata, req->bss->bssid);
4638                 goto err_clear;
4639         }
4640
4641         /* hold our own reference */
4642         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4643         return 0;
4644
4645  err_clear:
4646         eth_zero_addr(ifmgd->bssid);
4647         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4648         ifmgd->auth_data = NULL;
4649         mutex_lock(&sdata->local->mtx);
4650         ieee80211_vif_release_channel(sdata);
4651         mutex_unlock(&sdata->local->mtx);
4652  err_free:
4653         kfree(auth_data);
4654         return err;
4655 }
4656
4657 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4658                         struct cfg80211_assoc_request *req)
4659 {
4660         struct ieee80211_local *local = sdata->local;
4661         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4662         struct ieee80211_bss *bss = (void *)req->bss->priv;
4663         struct ieee80211_mgd_assoc_data *assoc_data;
4664         const struct cfg80211_bss_ies *beacon_ies;
4665         struct ieee80211_supported_band *sband;
4666         const u8 *ssidie, *ht_ie, *vht_ie;
4667         int i, err;
4668         bool override = false;
4669
4670         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4671         if (!assoc_data)
4672                 return -ENOMEM;
4673
4674         rcu_read_lock();
4675         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4676         if (!ssidie) {
4677                 rcu_read_unlock();
4678                 kfree(assoc_data);
4679                 return -EINVAL;
4680         }
4681         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4682         assoc_data->ssid_len = ssidie[1];
4683         rcu_read_unlock();
4684
4685         if (ifmgd->associated) {
4686                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4687
4688                 sdata_info(sdata,
4689                            "disconnect from AP %pM for new assoc to %pM\n",
4690                            ifmgd->associated->bssid, req->bss->bssid);
4691                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4692                                        WLAN_REASON_UNSPECIFIED,
4693                                        false, frame_buf);
4694
4695                 ieee80211_report_disconnect(sdata, frame_buf,
4696                                             sizeof(frame_buf), true,
4697                                             WLAN_REASON_UNSPECIFIED);
4698         }
4699
4700         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4701                 err = -EBUSY;
4702                 goto err_free;
4703         }
4704
4705         if (ifmgd->assoc_data) {
4706                 err = -EBUSY;
4707                 goto err_free;
4708         }
4709
4710         if (ifmgd->auth_data) {
4711                 bool match;
4712
4713                 /* keep sta info, bssid if matching */
4714                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4715                 ieee80211_destroy_auth_data(sdata, match);
4716         }
4717
4718         /* prepare assoc data */
4719
4720         ifmgd->beacon_crc_valid = false;
4721
4722         assoc_data->wmm = bss->wmm_used &&
4723                           (local->hw.queues >= IEEE80211_NUM_ACS);
4724
4725         /*
4726          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4727          * We still associate in non-HT mode (11a/b/g) if any one of these
4728          * ciphers is configured as pairwise.
4729          * We can set this to true for non-11n hardware, that'll be checked
4730          * separately along with the peer capabilities.
4731          */
4732         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4733                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4734                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4735                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4736                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4737                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4738                         netdev_info(sdata->dev,
4739                                     "disabling HT/VHT due to WEP/TKIP use\n");
4740                 }
4741         }
4742
4743         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4744         sband = local->hw.wiphy->bands[req->bss->channel->band];
4745         if (!sband->ht_cap.ht_supported ||
4746             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4747             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4748                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4749                 if (!bss->wmm_used &&
4750                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4751                         netdev_info(sdata->dev,
4752                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4753         }
4754
4755         /* disable VHT if we don't support it or the AP doesn't use WMM */
4756         if (!sband->vht_cap.vht_supported ||
4757             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4758             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4759                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4760                 if (!bss->wmm_used &&
4761                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4762                         netdev_info(sdata->dev,
4763                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4764         }
4765
4766         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4767         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4768                sizeof(ifmgd->ht_capa_mask));
4769
4770         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4771         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4772                sizeof(ifmgd->vht_capa_mask));
4773
4774         if (req->ie && req->ie_len) {
4775                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4776                 assoc_data->ie_len = req->ie_len;
4777         }
4778
4779         if (req->fils_kek) {
4780                 /* should already be checked in cfg80211 - so warn */
4781                 if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) {
4782                         err = -EINVAL;
4783                         goto err_free;
4784                 }
4785                 memcpy(assoc_data->fils_kek, req->fils_kek,
4786                        req->fils_kek_len);
4787                 assoc_data->fils_kek_len = req->fils_kek_len;
4788         }
4789
4790         if (req->fils_nonces)
4791                 memcpy(assoc_data->fils_nonces, req->fils_nonces,
4792                        2 * FILS_NONCE_LEN);
4793
4794         assoc_data->bss = req->bss;
4795
4796         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4797                 if (ifmgd->powersave)
4798                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4799                 else
4800                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4801         } else
4802                 sdata->smps_mode = ifmgd->req_smps;
4803
4804         assoc_data->capability = req->bss->capability;
4805         assoc_data->supp_rates = bss->supp_rates;
4806         assoc_data->supp_rates_len = bss->supp_rates_len;
4807
4808         rcu_read_lock();
4809         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4810         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4811                 assoc_data->ap_ht_param =
4812                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4813         else
4814                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4815         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4816         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4817                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4818                        sizeof(struct ieee80211_vht_cap));
4819         else
4820                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4821         rcu_read_unlock();
4822
4823         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4824                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4825              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4826                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4827
4828         if (bss->wmm_used && bss->uapsd_supported &&
4829             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4830                 assoc_data->uapsd = true;
4831                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4832         } else {
4833                 assoc_data->uapsd = false;
4834                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4835         }
4836
4837         if (req->prev_bssid)
4838                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4839
4840         if (req->use_mfp) {
4841                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4842                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4843         } else {
4844                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4845                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4846         }
4847
4848         if (req->flags & ASSOC_REQ_USE_RRM)
4849                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4850         else
4851                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4852
4853         if (req->crypto.control_port)
4854                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4855         else
4856                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4857
4858         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4859         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4860         sdata->control_port_over_nl80211 =
4861                                         req->crypto.control_port_over_nl80211;
4862         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4863                                                         sdata->vif.type);
4864
4865         /* kick off associate process */
4866
4867         ifmgd->assoc_data = assoc_data;
4868         ifmgd->dtim_period = 0;
4869         ifmgd->have_beacon = false;
4870
4871         /* override HT/VHT configuration only if the AP and we support it */
4872         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4873                 struct ieee80211_sta_ht_cap sta_ht_cap;
4874
4875                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4876                         override = true;
4877
4878                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4879                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4880
4881                 /* check for 40 MHz disable override */
4882                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4883                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4884                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4885                         override = true;
4886
4887                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4888                     req->flags & ASSOC_REQ_DISABLE_VHT)
4889                         override = true;
4890         }
4891
4892         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4893                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4894                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4895         }
4896
4897         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4898                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4899
4900         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4901         if (err)
4902                 goto err_clear;
4903
4904         rcu_read_lock();
4905         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4906
4907         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4908             !beacon_ies) {
4909                 /*
4910                  * Wait up to one beacon interval ...
4911                  * should this be more if we miss one?
4912                  */
4913                 sdata_info(sdata, "waiting for beacon from %pM\n",
4914                            ifmgd->bssid);
4915                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4916                 assoc_data->timeout_started = true;
4917                 assoc_data->need_beacon = true;
4918         } else if (beacon_ies) {
4919                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4920                                                     beacon_ies->data,
4921                                                     beacon_ies->len);
4922                 u8 dtim_count = 0;
4923
4924                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4925                         const struct ieee80211_tim_ie *tim;
4926                         tim = (void *)(tim_ie + 2);
4927                         ifmgd->dtim_period = tim->dtim_period;
4928                         dtim_count = tim->dtim_count;
4929                 }
4930                 ifmgd->have_beacon = true;
4931                 assoc_data->timeout = jiffies;
4932                 assoc_data->timeout_started = true;
4933
4934                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4935                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4936                         sdata->vif.bss_conf.sync_device_ts =
4937                                 bss->device_ts_beacon;
4938                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4939                 }
4940         } else {
4941                 assoc_data->timeout = jiffies;
4942                 assoc_data->timeout_started = true;
4943         }
4944         rcu_read_unlock();
4945
4946         run_again(sdata, assoc_data->timeout);
4947
4948         if (bss->corrupt_data) {
4949                 char *corrupt_type = "data";
4950                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4951                         if (bss->corrupt_data &
4952                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4953                                 corrupt_type = "beacon and probe response";
4954                         else
4955                                 corrupt_type = "beacon";
4956                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4957                         corrupt_type = "probe response";
4958                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4959                            corrupt_type);
4960         }
4961
4962         return 0;
4963  err_clear:
4964         eth_zero_addr(ifmgd->bssid);
4965         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4966         ifmgd->assoc_data = NULL;
4967  err_free:
4968         kfree(assoc_data);
4969         return err;
4970 }
4971
4972 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4973                          struct cfg80211_deauth_request *req)
4974 {
4975         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4976         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4977         bool tx = !req->local_state_change;
4978
4979         if (ifmgd->auth_data &&
4980             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4981                 sdata_info(sdata,
4982                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4983                            req->bssid, req->reason_code,
4984                            ieee80211_get_reason_code_string(req->reason_code));
4985
4986                 drv_mgd_prepare_tx(sdata->local, sdata);
4987                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4988                                                IEEE80211_STYPE_DEAUTH,
4989                                                req->reason_code, tx,
4990                                                frame_buf);
4991                 ieee80211_destroy_auth_data(sdata, false);
4992                 ieee80211_report_disconnect(sdata, frame_buf,
4993                                             sizeof(frame_buf), true,
4994                                             req->reason_code);
4995
4996                 return 0;
4997         }
4998
4999         if (ifmgd->assoc_data &&
5000             ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
5001                 sdata_info(sdata,
5002                            "aborting association with %pM by local choice (Reason: %u=%s)\n",
5003                            req->bssid, req->reason_code,
5004                            ieee80211_get_reason_code_string(req->reason_code));
5005
5006                 drv_mgd_prepare_tx(sdata->local, sdata);
5007                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
5008                                                IEEE80211_STYPE_DEAUTH,
5009                                                req->reason_code, tx,
5010                                                frame_buf);
5011                 ieee80211_destroy_assoc_data(sdata, false, true);
5012                 ieee80211_report_disconnect(sdata, frame_buf,
5013                                             sizeof(frame_buf), true,
5014                                             req->reason_code);
5015                 return 0;
5016         }
5017
5018         if (ifmgd->associated &&
5019             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5020                 sdata_info(sdata,
5021                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
5022                            req->bssid, req->reason_code,
5023                            ieee80211_get_reason_code_string(req->reason_code));
5024
5025                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5026                                        req->reason_code, tx, frame_buf);
5027                 ieee80211_report_disconnect(sdata, frame_buf,
5028                                             sizeof(frame_buf), true,
5029                                             req->reason_code);
5030                 return 0;
5031         }
5032
5033         return -ENOTCONN;
5034 }
5035
5036 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5037                            struct cfg80211_disassoc_request *req)
5038 {
5039         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5040         u8 bssid[ETH_ALEN];
5041         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5042
5043         /*
5044          * cfg80211 should catch this ... but it's racy since
5045          * we can receive a disassoc frame, process it, hand it
5046          * to cfg80211 while that's in a locked section already
5047          * trying to tell us that the user wants to disconnect.
5048          */
5049         if (ifmgd->associated != req->bss)
5050                 return -ENOLINK;
5051
5052         sdata_info(sdata,
5053                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
5054                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5055
5056         memcpy(bssid, req->bss->bssid, ETH_ALEN);
5057         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5058                                req->reason_code, !req->local_state_change,
5059                                frame_buf);
5060
5061         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5062                                     req->reason_code);
5063
5064         return 0;
5065 }
5066
5067 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5068 {
5069         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5070
5071         /*
5072          * Make sure some work items will not run after this,
5073          * they will not do anything but might not have been
5074          * cancelled when disconnecting.
5075          */
5076         cancel_work_sync(&ifmgd->monitor_work);
5077         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5078         cancel_work_sync(&ifmgd->request_smps_work);
5079         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5080         cancel_work_sync(&ifmgd->chswitch_work);
5081         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5082
5083         sdata_lock(sdata);
5084         if (ifmgd->assoc_data) {
5085                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5086                 ieee80211_destroy_assoc_data(sdata, false, false);
5087                 cfg80211_assoc_timeout(sdata->dev, bss);
5088         }
5089         if (ifmgd->auth_data)
5090                 ieee80211_destroy_auth_data(sdata, false);
5091         spin_lock_bh(&ifmgd->teardown_lock);
5092         if (ifmgd->teardown_skb) {
5093                 kfree_skb(ifmgd->teardown_skb);
5094                 ifmgd->teardown_skb = NULL;
5095                 ifmgd->orig_teardown_skb = NULL;
5096         }
5097         spin_unlock_bh(&ifmgd->teardown_lock);
5098         del_timer_sync(&ifmgd->timer);
5099         sdata_unlock(sdata);
5100 }
5101
5102 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5103                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5104                                s32 rssi_level,
5105                                gfp_t gfp)
5106 {
5107         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5108
5109         trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level);
5110
5111         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp);
5112 }
5113 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5114
5115 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5116 {
5117         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5118
5119         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5120
5121         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5122 }
5123 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);