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 - 2016 Intel Deutschland GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/crc32.h>
  24 #include <linux/slab.h>
  25 #include <linux/export.h>
  26 #include <net/mac80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "led.h"
  33
  34 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  35 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  36 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  37 #define IEEE80211_AUTH_MAX_TRIES        3
  38 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  39 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  40 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  41 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  42 #define IEEE80211_ASSOC_MAX_TRIES       3
  43
  44 static int max_nullfunc_tries = 2;
  45 module_param(max_nullfunc_tries, int, 0644);
  46 MODULE_PARM_DESC(max_nullfunc_tries,
  47                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  48
  49 static int max_probe_tries = 5;
  50 module_param(max_probe_tries, int, 0644);
  51 MODULE_PARM_DESC(max_probe_tries,
  52                  "Maximum probe tries before disconnecting (reason 4).");
  53
  54 /*
  55  * Beacon loss timeout is calculated as N frames times the
  56  * advertised beacon interval.  This may need to be somewhat
  57  * higher than what hardware might detect to account for
  58  * delays in the host processing frames. But since we also
  59  * probe on beacon miss before declaring the connection lost
  60  * default to what we want.
  61  */
  62 static int beacon_loss_count = 7;
  63 module_param(beacon_loss_count, int, 0644);
  64 MODULE_PARM_DESC(beacon_loss_count,
  65                  "Number of beacon intervals before we decide beacon was lost.");
  66
  67 /*
  68  * Time the connection can be idle before we probe
  69  * it to see if we can still talk to the AP.
  70  */
  71 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  72 /*
  73  * Time we wait for a probe response after sending
  74  * a probe request because of beacon loss or for
  75  * checking the connection still works.
  76  */
  77 static int probe_wait_ms = 500;
  78 module_param(probe_wait_ms, int, 0644);
  79 MODULE_PARM_DESC(probe_wait_ms,
  80                  "Maximum time(ms) to wait for probe response"
  81                  " before disconnecting (reason 4).");
  82
  83 /*
  84  * How many Beacon frames need to have been used in average signal strength
  85  * before starting to indicate signal change events.
  86  */
  87 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  88
  89 /*
  90  * We can have multiple work items (and connection probing)
  91  * scheduling this timer, but we need to take care to only
  92  * reschedule it when it should fire _earlier_ than it was
  93  * asked for before, or if it's not pending right now. This
  94  * function ensures that. Note that it then is required to
  95  * run this function for all timeouts after the first one
  96  * has happened -- the work that runs from this timer will
  97  * do that.
  98  */
  99 static void run_again(struct ieee80211_sub_if_data *sdata,
 100                       unsigned long timeout)
 101 {
 102         sdata_assert_lock(sdata);
 103
 104         if (!timer_pending(&sdata->u.mgd.timer) ||
 105             time_before(timeout, sdata->u.mgd.timer.expires))
 106                 mod_timer(&sdata->u.mgd.timer, timeout);
 107 }
 108
 109 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 110 {
 111         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 112                 return;
 113
 114         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 119 }
 120
 121 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 122 {
 123         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 124
 125         if (unlikely(!ifmgd->associated))
 126                 return;
 127
 128         if (ifmgd->probe_send_count)
 129                 ifmgd->probe_send_count = 0;
 130
 131         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 132                 return;
 133
 134         mod_timer(&ifmgd->conn_mon_timer,
 135                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 136 }
 137
 138 static int ecw2cw(int ecw)
 139 {
 140         return (1 << ecw) - 1;
 141 }
 142
 143 static u32
 144 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 145                              struct ieee80211_supported_band *sband,
 146                              struct ieee80211_channel *channel,
 147                              const struct ieee80211_ht_cap *ht_cap,
 148                              const struct ieee80211_ht_operation *ht_oper,
 149                              const struct ieee80211_vht_operation *vht_oper,
 150                              struct cfg80211_chan_def *chandef, bool tracking)
 151 {
 152         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 153         struct cfg80211_chan_def vht_chandef;
 154         struct ieee80211_sta_ht_cap sta_ht_cap;
 155         u32 ht_cfreq, ret;
 156
 157         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 158         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 159
 160         chandef->chan = channel;
 161         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 162         chandef->center_freq1 = channel->center_freq;
 163         chandef->center_freq2 = 0;
 164
 165         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 166                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 167                 goto out;
 168         }
 169
 170         chandef->width = NL80211_CHAN_WIDTH_20;
 171
 172         if (!(ht_cap->cap_info &
 173               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 174                 ret = IEEE80211_STA_DISABLE_40MHZ;
 175                 vht_chandef = *chandef;
 176                 goto out;
 177         }
 178
 179         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 180                                                   channel->band);
 181         /* check that channel matches the right operating channel */
 182         if (!tracking && channel->center_freq != ht_cfreq) {
 183                 /*
 184                  * It's possible that some APs are confused here;
 185                  * Netgear WNDR3700 sometimes reports 4 higher than
 186                  * the actual channel in association responses, but
 187                  * since we look at probe response/beacon data here
 188                  * it should be OK.
 189                  */
 190                 sdata_info(sdata,
 191                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 192                            channel->center_freq, ht_cfreq,
 193                            ht_oper->primary_chan, channel->band);
 194                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 195                 goto out;
 196         }
 197
 198         /* check 40 MHz support, if we have it */
 199         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 200                 ieee80211_chandef_ht_oper(ht_oper, chandef);
 201         } else {
 202                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 203                 ret = IEEE80211_STA_DISABLE_VHT;
 204                 /* also mark 40 MHz disabled */
 205                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 206                 goto out;
 207         }
 208
 209         if (!vht_oper || !sband->vht_cap.vht_supported) {
 210                 ret = IEEE80211_STA_DISABLE_VHT;
 211                 goto out;
 212         }
 213
 214         vht_chandef = *chandef;
 215         if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
 216                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 217                         sdata_info(sdata,
 218                                    "AP VHT information is invalid, disable VHT\n");
 219                 ret = IEEE80211_STA_DISABLE_VHT;
 220                 goto out;
 221         }
 222
 223         if (!cfg80211_chandef_valid(&vht_chandef)) {
 224                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 225                         sdata_info(sdata,
 226                                    "AP VHT information is invalid, disable VHT\n");
 227                 ret = IEEE80211_STA_DISABLE_VHT;
 228                 goto out;
 229         }
 230
 231         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 232                 ret = 0;
 233                 goto out;
 234         }
 235
 236         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 237                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 238                         sdata_info(sdata,
 239                                    "AP VHT information doesn't match HT, disable VHT\n");
 240                 ret = IEEE80211_STA_DISABLE_VHT;
 241                 goto out;
 242         }
 243
 244         *chandef = vht_chandef;
 245
 246         ret = 0;
 247
 248 out:
 249         /*
 250          * When tracking the current AP, don't do any further checks if the
 251          * new chandef is identical to the one we're currently using for the
 252          * connection. This keeps us from playing ping-pong with regulatory,
 253          * without it the following can happen (for example):
 254          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 255          *  - AP advertises regdom US
 256          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 257          *  - the code below detects an unsupported channel, downgrades, and
 258          *    we disconnect from the AP in the caller
 259          *  - disconnect causes CRDA to reload world regdomain and the game
 260          *    starts anew.
 261          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 262          *
 263          * It seems possible that there are still scenarios with CSA or real
 264          * bandwidth changes where a this could happen, but those cases are
 265          * less common and wouldn't completely prevent using the AP.
 266          */
 267         if (tracking &&
 268             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 269                 return ret;
 270
 271         /* don't print the message below for VHT mismatch if VHT is disabled */
 272         if (ret & IEEE80211_STA_DISABLE_VHT)
 273                 vht_chandef = *chandef;
 274
 275         /*
 276          * Ignore the DISABLED flag when we're already connected and only
 277          * tracking the APs beacon for bandwidth changes - otherwise we
 278          * might get disconnected here if we connect to an AP, update our
 279          * regulatory information based on the AP's country IE and the
 280          * information we have is wrong/outdated and disables the channel
 281          * that we're actually using for the connection to the AP.
 282          */
 283         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 284                                         tracking ? 0 :
 285                                                    IEEE80211_CHAN_DISABLED)) {
 286                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 287                         ret = IEEE80211_STA_DISABLE_HT |
 288                               IEEE80211_STA_DISABLE_VHT;
 289                         break;
 290                 }
 291
 292                 ret |= ieee80211_chandef_downgrade(chandef);
 293         }
 294
 295         if (chandef->width != vht_chandef.width && !tracking)
 296                 sdata_info(sdata,
 297                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 298
 299         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 300         return ret;
 301 }
 302
 303 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 304                                struct sta_info *sta,
 305                                const struct ieee80211_ht_cap *ht_cap,
 306                                const struct ieee80211_ht_operation *ht_oper,
 307                                const struct ieee80211_vht_operation *vht_oper,
 308                                const u8 *bssid, u32 *changed)
 309 {
 310         struct ieee80211_local *local = sdata->local;
 311         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 312         struct ieee80211_supported_band *sband;
 313         struct ieee80211_channel *chan;
 314         struct cfg80211_chan_def chandef;
 315         u16 ht_opmode;
 316         u32 flags;
 317         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 318         int ret;
 319
 320         /* if HT was/is disabled, don't track any bandwidth changes */
 321         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 322                 return 0;
 323
 324         /* don't check VHT if we associated as non-VHT station */
 325         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 326                 vht_oper = NULL;
 327
 328         if (WARN_ON_ONCE(!sta))
 329                 return -EINVAL;
 330
 331         /*
 332          * if bss configuration changed store the new one -
 333          * this may be applicable even if channel is identical
 334          */
 335         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 336         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 337                 *changed |= BSS_CHANGED_HT;
 338                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 339         }
 340
 341         chan = sdata->vif.bss_conf.chandef.chan;
 342         sband = local->hw.wiphy->bands[chan->band];
 343
 344         /* calculate new channel (type) based on HT/VHT operation IEs */
 345         flags = ieee80211_determine_chantype(sdata, sband, chan,
 346                                              ht_cap, ht_oper, vht_oper,
 347                                              &chandef, true);
 348
 349         /*
 350          * Downgrade the new channel if we associated with restricted
 351          * capabilities. For example, if we associated as a 20 MHz STA
 352          * to a 40 MHz AP (due to regulatory, capabilities or config
 353          * reasons) then switching to a 40 MHz channel now won't do us
 354          * any good -- we couldn't use it with the AP.
 355          */
 356         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 357             chandef.width == NL80211_CHAN_WIDTH_80P80)
 358                 flags |= ieee80211_chandef_downgrade(&chandef);
 359         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 360             chandef.width == NL80211_CHAN_WIDTH_160)
 361                 flags |= ieee80211_chandef_downgrade(&chandef);
 362         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 363             chandef.width > NL80211_CHAN_WIDTH_20)
 364                 flags |= ieee80211_chandef_downgrade(&chandef);
 365
 366         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 367                 return 0;
 368
 369         sdata_info(sdata,
 370                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 371                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 372                    chandef.center_freq1, chandef.center_freq2);
 373
 374         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 375                                       IEEE80211_STA_DISABLE_VHT |
 376                                       IEEE80211_STA_DISABLE_40MHZ |
 377                                       IEEE80211_STA_DISABLE_80P80MHZ |
 378                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 379             !cfg80211_chandef_valid(&chandef)) {
 380                 sdata_info(sdata,
 381                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 382                            ifmgd->bssid);
 383                 return -EINVAL;
 384         }
 385
 386         switch (chandef.width) {
 387         case NL80211_CHAN_WIDTH_20_NOHT:
 388         case NL80211_CHAN_WIDTH_20:
 389                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 390                 break;
 391         case NL80211_CHAN_WIDTH_40:
 392                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 393                 break;
 394         case NL80211_CHAN_WIDTH_80:
 395                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 396                 break;
 397         case NL80211_CHAN_WIDTH_80P80:
 398         case NL80211_CHAN_WIDTH_160:
 399                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 400                 break;
 401         default:
 402                 return -EINVAL;
 403         }
 404
 405         if (new_sta_bw > sta->cur_max_bandwidth)
 406                 new_sta_bw = sta->cur_max_bandwidth;
 407
 408         if (new_sta_bw < sta->sta.bandwidth) {
 409                 sta->sta.bandwidth = new_sta_bw;
 410                 rate_control_rate_update(local, sband, sta,
 411                                          IEEE80211_RC_BW_CHANGED);
 412         }
 413
 414         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 415         if (ret) {
 416                 sdata_info(sdata,
 417                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 418                            ifmgd->bssid);
 419                 return ret;
 420         }
 421
 422         if (new_sta_bw > sta->sta.bandwidth) {
 423                 sta->sta.bandwidth = new_sta_bw;
 424                 rate_control_rate_update(local, sband, sta,
 425                                          IEEE80211_RC_BW_CHANGED);
 426         }
 427
 428         return 0;
 429 }
 430
 431 /* frame sending functions */
 432
 433 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 434                                 struct sk_buff *skb, u8 ap_ht_param,
 435                                 struct ieee80211_supported_band *sband,
 436                                 struct ieee80211_channel *channel,
 437                                 enum ieee80211_smps_mode smps)
 438 {
 439         u8 *pos;
 440         u32 flags = channel->flags;
 441         u16 cap;
 442         struct ieee80211_sta_ht_cap ht_cap;
 443
 444         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 445
 446         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 447         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 448
 449         /* determine capability flags */
 450         cap = ht_cap.cap;
 451
 452         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 453         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 454                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 455                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 456                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 457                 }
 458                 break;
 459         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 460                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 461                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 462                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 463                 }
 464                 break;
 465         }
 466
 467         /*
 468          * If 40 MHz was disabled associate as though we weren't
 469          * capable of 40 MHz -- some broken APs will never fall
 470          * back to trying to transmit in 20 MHz.
 471          */
 472         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 473                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 474                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 475         }
 476
 477         /* set SM PS mode properly */
 478         cap &= ~IEEE80211_HT_CAP_SM_PS;
 479         switch (smps) {
 480         case IEEE80211_SMPS_AUTOMATIC:
 481         case IEEE80211_SMPS_NUM_MODES:
 482                 WARN_ON(1);
 483         case IEEE80211_SMPS_OFF:
 484                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 485                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 486                 break;
 487         case IEEE80211_SMPS_STATIC:
 488                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 489                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 490                 break;
 491         case IEEE80211_SMPS_DYNAMIC:
 492                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 493                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 494                 break;
 495         }
 496
 497         /* reserve and fill IE */
 498         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 499         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 500 }
 501
 502 /* This function determines vht capability flags for the association
 503  * and builds the IE.
 504  * Note - the function may set the owner of the MU-MIMO capability
 505  */
 506 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 507                                  struct sk_buff *skb,
 508                                  struct ieee80211_supported_band *sband,
 509                                  struct ieee80211_vht_cap *ap_vht_cap)
 510 {
 511         struct ieee80211_local *local = sdata->local;
 512         u8 *pos;
 513         u32 cap;
 514         struct ieee80211_sta_vht_cap vht_cap;
 515         u32 mask, ap_bf_sts, our_bf_sts;
 516
 517         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 518
 519         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 520         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 521
 522         /* determine capability flags */
 523         cap = vht_cap.cap;
 524
 525         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 526                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 527
 528                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 529                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 530                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 531                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 532         }
 533
 534         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 535                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 536                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 537         }
 538
 539         /*
 540          * Some APs apparently get confused if our capabilities are better
 541          * than theirs, so restrict what we advertise in the assoc request.
 542          */
 543         if (!(ap_vht_cap->vht_cap_info &
 544                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 545                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 546                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 547         else if (!(ap_vht_cap->vht_cap_info &
 548                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 549                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 550
 551         /*
 552          * If some other vif is using the MU-MIMO capablity we cannot associate
 553          * using MU-MIMO - this will lead to contradictions in the group-id
 554          * mechanism.
 555          * Ownership is defined since association request, in order to avoid
 556          * simultaneous associations with MU-MIMO.
 557          */
 558         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 559                 bool disable_mu_mimo = false;
 560                 struct ieee80211_sub_if_data *other;
 561
 562                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 563                         if (other->vif.mu_mimo_owner) {
 564                                 disable_mu_mimo = true;
 565                                 break;
 566                         }
 567                 }
 568                 if (disable_mu_mimo)
 569                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 570                 else
 571                         sdata->vif.mu_mimo_owner = true;
 572         }
 573
 574         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 575
 576         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 577         our_bf_sts = cap & mask;
 578
 579         if (ap_bf_sts < our_bf_sts) {
 580                 cap &= ~mask;
 581                 cap |= ap_bf_sts;
 582         }
 583
 584         /* reserve and fill IE */
 585         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 586         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 587 }
 588
 589 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 590 {
 591         struct ieee80211_local *local = sdata->local;
 592         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 593         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 594         struct sk_buff *skb;
 595         struct ieee80211_mgmt *mgmt;
 596         u8 *pos, qos_info;
 597         size_t offset = 0, noffset;
 598         int i, count, rates_len, supp_rates_len, shift;
 599         u16 capab;
 600         struct ieee80211_supported_band *sband;
 601         struct ieee80211_chanctx_conf *chanctx_conf;
 602         struct ieee80211_channel *chan;
 603         u32 rate_flags, rates = 0;
 604
 605         sdata_assert_lock(sdata);
 606
 607         rcu_read_lock();
 608         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 609         if (WARN_ON(!chanctx_conf)) {
 610                 rcu_read_unlock();
 611                 return;
 612         }
 613         chan = chanctx_conf->def.chan;
 614         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 615         rcu_read_unlock();
 616         sband = local->hw.wiphy->bands[chan->band];
 617         shift = ieee80211_vif_get_shift(&sdata->vif);
 618
 619         if (assoc_data->supp_rates_len) {
 620                 /*
 621                  * Get all rates supported by the device and the AP as
 622                  * some APs don't like getting a superset of their rates
 623                  * in the association request (e.g. D-Link DAP 1353 in
 624                  * b-only mode)...
 625                  */
 626                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 627                                                      assoc_data->supp_rates,
 628                                                      assoc_data->supp_rates_len,
 629                                                      &rates);
 630         } else {
 631                 /*
 632                  * In case AP not provide any supported rates information
 633                  * before association, we send information element(s) with
 634                  * all rates that we support.
 635                  */
 636                 rates_len = 0;
 637                 for (i = 0; i < sband->n_bitrates; i++) {
 638                         if ((rate_flags & sband->bitrates[i].flags)
 639                             != rate_flags)
 640                                 continue;
 641                         rates |= BIT(i);
 642                         rates_len++;
 643                 }
 644         }
 645
 646         skb = alloc_skb(local->hw.extra_tx_headroom +
 647                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 648                         2 + assoc_data->ssid_len + /* SSID */
 649                         4 + rates_len + /* (extended) rates */
 650                         4 + /* power capability */
 651                         2 + 2 * sband->n_channels + /* supported channels */
 652                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 653                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 654                         assoc_data->ie_len + /* extra IEs */
 655                         9, /* WMM */
 656                         GFP_KERNEL);
 657         if (!skb)
 658                 return;
 659
 660         skb_reserve(skb, local->hw.extra_tx_headroom);
 661
 662         capab = WLAN_CAPABILITY_ESS;
 663
 664         if (sband->band == NL80211_BAND_2GHZ) {
 665                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 666                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 667         }
 668
 669         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 670                 capab |= WLAN_CAPABILITY_PRIVACY;
 671
 672         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 673             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 674                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 675
 676         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 677                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 678
 679         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 680         memset(mgmt, 0, 24);
 681         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 682         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 683         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 684
 685         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 686                 skb_put(skb, 10);
 687                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 688                                                   IEEE80211_STYPE_REASSOC_REQ);
 689                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 690                 mgmt->u.reassoc_req.listen_interval =
 691                                 cpu_to_le16(local->hw.conf.listen_interval);
 692                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 693                        ETH_ALEN);
 694         } else {
 695                 skb_put(skb, 4);
 696                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 697                                                   IEEE80211_STYPE_ASSOC_REQ);
 698                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 699                 mgmt->u.assoc_req.listen_interval =
 700                                 cpu_to_le16(local->hw.conf.listen_interval);
 701         }
 702
 703         /* SSID */
 704         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 705         *pos++ = WLAN_EID_SSID;
 706         *pos++ = assoc_data->ssid_len;
 707         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 708
 709         /* add all rates which were marked to be used above */
 710         supp_rates_len = rates_len;
 711         if (supp_rates_len > 8)
 712                 supp_rates_len = 8;
 713
 714         pos = skb_put(skb, supp_rates_len + 2);
 715         *pos++ = WLAN_EID_SUPP_RATES;
 716         *pos++ = supp_rates_len;
 717
 718         count = 0;
 719         for (i = 0; i < sband->n_bitrates; i++) {
 720                 if (BIT(i) & rates) {
 721                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 722                                                 5 * (1 << shift));
 723                         *pos++ = (u8) rate;
 724                         if (++count == 8)
 725                                 break;
 726                 }
 727         }
 728
 729         if (rates_len > count) {
 730                 pos = skb_put(skb, rates_len - count + 2);
 731                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 732                 *pos++ = rates_len - count;
 733
 734                 for (i++; i < sband->n_bitrates; i++) {
 735                         if (BIT(i) & rates) {
 736                                 int rate;
 737                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 738                                                     5 * (1 << shift));
 739                                 *pos++ = (u8) rate;
 740                         }
 741                 }
 742         }
 743
 744         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 745             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 746                 pos = skb_put(skb, 4);
 747                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 748                 *pos++ = 2;
 749                 *pos++ = 0; /* min tx power */
 750                  /* max tx power */
 751                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 752         }
 753
 754         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 755                 /* TODO: get this in reg domain format */
 756                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 757                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 758                 *pos++ = 2 * sband->n_channels;
 759                 for (i = 0; i < sband->n_channels; i++) {
 760                         *pos++ = ieee80211_frequency_to_channel(
 761                                         sband->channels[i].center_freq);
 762                         *pos++ = 1; /* one channel in the subband*/
 763                 }
 764         }
 765
 766         /* if present, add any custom IEs that go before HT */
 767         if (assoc_data->ie_len) {
 768                 static const u8 before_ht[] = {
 769                         WLAN_EID_SSID,
 770                         WLAN_EID_SUPP_RATES,
 771                         WLAN_EID_EXT_SUPP_RATES,
 772                         WLAN_EID_PWR_CAPABILITY,
 773                         WLAN_EID_SUPPORTED_CHANNELS,
 774                         WLAN_EID_RSN,
 775                         WLAN_EID_QOS_CAPA,
 776                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 777                         WLAN_EID_MOBILITY_DOMAIN,
 778                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 779                         WLAN_EID_RIC_DATA,              /* reassoc only */
 780                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 781                 };
 782                 static const u8 after_ric[] = {
 783                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 784                         WLAN_EID_HT_CAPABILITY,
 785                         WLAN_EID_BSS_COEX_2040,
 786                         WLAN_EID_EXT_CAPABILITY,
 787                         WLAN_EID_QOS_TRAFFIC_CAPA,
 788                         WLAN_EID_TIM_BCAST_REQ,
 789                         WLAN_EID_INTERWORKING,
 790                         /* 60GHz doesn't happen right now */
 791                         WLAN_EID_VHT_CAPABILITY,
 792                         WLAN_EID_OPMODE_NOTIF,
 793                 };
 794
 795                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 796                                                  assoc_data->ie_len,
 797                                                  before_ht,
 798                                                  ARRAY_SIZE(before_ht),
 799                                                  after_ric,
 800                                                  ARRAY_SIZE(after_ric),
 801                                                  offset);
 802                 pos = skb_put(skb, noffset - offset);
 803                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 804                 offset = noffset;
 805         }
 806
 807         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 808                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 809                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 810
 811         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 812                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 813                                     sband, chan, sdata->smps_mode);
 814
 815         /* if present, add any custom IEs that go before VHT */
 816         if (assoc_data->ie_len) {
 817                 static const u8 before_vht[] = {
 818                         WLAN_EID_SSID,
 819                         WLAN_EID_SUPP_RATES,
 820                         WLAN_EID_EXT_SUPP_RATES,
 821                         WLAN_EID_PWR_CAPABILITY,
 822                         WLAN_EID_SUPPORTED_CHANNELS,
 823                         WLAN_EID_RSN,
 824                         WLAN_EID_QOS_CAPA,
 825                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 826                         WLAN_EID_MOBILITY_DOMAIN,
 827                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 828                         WLAN_EID_HT_CAPABILITY,
 829                         WLAN_EID_BSS_COEX_2040,
 830                         WLAN_EID_EXT_CAPABILITY,
 831                         WLAN_EID_QOS_TRAFFIC_CAPA,
 832                         WLAN_EID_TIM_BCAST_REQ,
 833                         WLAN_EID_INTERWORKING,
 834                 };
 835
 836                 /* RIC already taken above, so no need to handle here anymore */
 837                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 838                                              before_vht, ARRAY_SIZE(before_vht),
 839                                              offset);
 840                 pos = skb_put(skb, noffset - offset);
 841                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 842                 offset = noffset;
 843         }
 844
 845         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 846                 ieee80211_add_vht_ie(sdata, skb, sband,
 847                                      &assoc_data->ap_vht_cap);
 848
 849         /* if present, add any custom non-vendor IEs that go after HT */
 850         if (assoc_data->ie_len) {
 851                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 852                                                     assoc_data->ie_len,
 853                                                     offset);
 854                 pos = skb_put(skb, noffset - offset);
 855                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 856                 offset = noffset;
 857         }
 858
 859         if (assoc_data->wmm) {
 860                 if (assoc_data->uapsd) {
 861                         qos_info = ifmgd->uapsd_queues;
 862                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 863                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 864                 } else {
 865                         qos_info = 0;
 866                 }
 867
 868                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 869         }
 870
 871         /* add any remaining custom (i.e. vendor specific here) IEs */
 872         if (assoc_data->ie_len) {
 873                 noffset = assoc_data->ie_len;
 874                 pos = skb_put(skb, noffset - offset);
 875                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 876         }
 877
 878         drv_mgd_prepare_tx(local, sdata);
 879
 880         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 881         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 882                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 883                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 884         ieee80211_tx_skb(sdata, skb);
 885 }
 886
 887 void ieee80211_send_pspoll(struct ieee80211_local *local,
 888                            struct ieee80211_sub_if_data *sdata)
 889 {
 890         struct ieee80211_pspoll *pspoll;
 891         struct sk_buff *skb;
 892
 893         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 894         if (!skb)
 895                 return;
 896
 897         pspoll = (struct ieee80211_pspoll *) skb->data;
 898         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 899
 900         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 901         ieee80211_tx_skb(sdata, skb);
 902 }
 903
 904 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 905                              struct ieee80211_sub_if_data *sdata,
 906                              bool powersave)
 907 {
 908         struct sk_buff *skb;
 909         struct ieee80211_hdr_3addr *nullfunc;
 910         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 911
 912         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 913         if (!skb)
 914                 return;
 915
 916         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 917         if (powersave)
 918                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 919
 920         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 921                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 922
 923         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 924                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 925
 926         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 927                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 928
 929         ieee80211_tx_skb(sdata, skb);
 930 }
 931
 932 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 933                                           struct ieee80211_sub_if_data *sdata)
 934 {
 935         struct sk_buff *skb;
 936         struct ieee80211_hdr *nullfunc;
 937         __le16 fc;
 938
 939         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 940                 return;
 941
 942         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 943         if (!skb)
 944                 return;
 945
 946         skb_reserve(skb, local->hw.extra_tx_headroom);
 947
 948         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 949         memset(nullfunc, 0, 30);
 950         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 951                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 952         nullfunc->frame_control = fc;
 953         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 954         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 955         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 956         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 957
 958         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 959         ieee80211_tx_skb(sdata, skb);
 960 }
 961
 962 /* spectrum management related things */
 963 static void ieee80211_chswitch_work(struct work_struct *work)
 964 {
 965         struct ieee80211_sub_if_data *sdata =
 966                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 967         struct ieee80211_local *local = sdata->local;
 968         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 969         int ret;
 970
 971         if (!ieee80211_sdata_running(sdata))
 972                 return;
 973
 974         sdata_lock(sdata);
 975         mutex_lock(&local->mtx);
 976         mutex_lock(&local->chanctx_mtx);
 977
 978         if (!ifmgd->associated)
 979                 goto out;
 980
 981         if (!sdata->vif.csa_active)
 982                 goto out;
 983
 984         /*
 985          * using reservation isn't immediate as it may be deferred until later
 986          * with multi-vif. once reservation is complete it will re-schedule the
 987          * work with no reserved_chanctx so verify chandef to check if it
 988          * completed successfully
 989          */
 990
 991         if (sdata->reserved_chanctx) {
 992                 /*
 993                  * with multi-vif csa driver may call ieee80211_csa_finish()
 994                  * many times while waiting for other interfaces to use their
 995                  * reservations
 996                  */
 997                 if (sdata->reserved_ready)
 998                         goto out;
 999
1000                 ret = ieee80211_vif_use_reserved_context(sdata);
1001                 if (ret) {
1002                         sdata_info(sdata,
1003                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1004                                    ret);
1005                         ieee80211_queue_work(&sdata->local->hw,
1006                                              &ifmgd->csa_connection_drop_work);
1007                         goto out;
1008                 }
1009
1010                 goto out;
1011         }
1012
1013         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1014                                         &sdata->csa_chandef)) {
1015                 sdata_info(sdata,
1016                            "failed to finalize channel switch, disconnecting\n");
1017                 ieee80211_queue_work(&sdata->local->hw,
1018                                      &ifmgd->csa_connection_drop_work);
1019                 goto out;
1020         }
1021
1022         /* XXX: shouldn't really modify cfg80211-owned data! */
1023         ifmgd->associated->channel = sdata->csa_chandef.chan;
1024
1025         ifmgd->csa_waiting_bcn = true;
1026
1027         ieee80211_sta_reset_beacon_monitor(sdata);
1028         ieee80211_sta_reset_conn_monitor(sdata);
1029
1030 out:
1031         mutex_unlock(&local->chanctx_mtx);
1032         mutex_unlock(&local->mtx);
1033         sdata_unlock(sdata);
1034 }
1035
1036 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1037 {
1038         struct ieee80211_local *local = sdata->local;
1039         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1040         int ret;
1041
1042         sdata_assert_lock(sdata);
1043
1044         WARN_ON(!sdata->vif.csa_active);
1045
1046         if (sdata->csa_block_tx) {
1047                 ieee80211_wake_vif_queues(local, sdata,
1048                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1049                 sdata->csa_block_tx = false;
1050         }
1051
1052         sdata->vif.csa_active = false;
1053         ifmgd->csa_waiting_bcn = false;
1054
1055         ret = drv_post_channel_switch(sdata);
1056         if (ret) {
1057                 sdata_info(sdata,
1058                            "driver post channel switch failed, disconnecting\n");
1059                 ieee80211_queue_work(&local->hw,
1060                                      &ifmgd->csa_connection_drop_work);
1061                 return;
1062         }
1063
1064         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1065 }
1066
1067 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1068 {
1069         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1070         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1071
1072         trace_api_chswitch_done(sdata, success);
1073         if (!success) {
1074                 sdata_info(sdata,
1075                            "driver channel switch failed, disconnecting\n");
1076                 ieee80211_queue_work(&sdata->local->hw,
1077                                      &ifmgd->csa_connection_drop_work);
1078         } else {
1079                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1080         }
1081 }
1082 EXPORT_SYMBOL(ieee80211_chswitch_done);
1083
1084 static void ieee80211_chswitch_timer(unsigned long data)
1085 {
1086         struct ieee80211_sub_if_data *sdata =
1087                 (struct ieee80211_sub_if_data *) data;
1088
1089         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1090 }
1091
1092 static void
1093 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1094                                  u64 timestamp, u32 device_timestamp,
1095                                  struct ieee802_11_elems *elems,
1096                                  bool beacon)
1097 {
1098         struct ieee80211_local *local = sdata->local;
1099         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1100         struct cfg80211_bss *cbss = ifmgd->associated;
1101         struct ieee80211_chanctx_conf *conf;
1102         struct ieee80211_chanctx *chanctx;
1103         enum nl80211_band current_band;
1104         struct ieee80211_csa_ie csa_ie;
1105         struct ieee80211_channel_switch ch_switch;
1106         int res;
1107
1108         sdata_assert_lock(sdata);
1109
1110         if (!cbss)
1111                 return;
1112
1113         if (local->scanning)
1114                 return;
1115
1116         /* disregard subsequent announcements if we are already processing */
1117         if (sdata->vif.csa_active)
1118                 return;
1119
1120         current_band = cbss->channel->band;
1121         memset(&csa_ie, 0, sizeof(csa_ie));
1122         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1123                                            ifmgd->flags,
1124                                            ifmgd->associated->bssid, &csa_ie);
1125         if (res < 0)
1126                 ieee80211_queue_work(&local->hw,
1127                                      &ifmgd->csa_connection_drop_work);
1128         if (res)
1129                 return;
1130
1131         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1132                                      IEEE80211_CHAN_DISABLED)) {
1133                 sdata_info(sdata,
1134                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1135                            ifmgd->associated->bssid,
1136                            csa_ie.chandef.chan->center_freq,
1137                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1138                            csa_ie.chandef.center_freq2);
1139                 ieee80211_queue_work(&local->hw,
1140                                      &ifmgd->csa_connection_drop_work);
1141                 return;
1142         }
1143
1144         if (cfg80211_chandef_identical(&csa_ie.chandef,
1145                                        &sdata->vif.bss_conf.chandef)) {
1146                 if (ifmgd->csa_ignored_same_chan)
1147                         return;
1148                 sdata_info(sdata,
1149                            "AP %pM tries to chanswitch to same channel, ignore\n",
1150                            ifmgd->associated->bssid);
1151                 ifmgd->csa_ignored_same_chan = true;
1152                 return;
1153         }
1154
1155         /*
1156          * Drop all TDLS peers - either we disconnect or move to a different
1157          * channel from this point on. There's no telling what our peer will do.
1158          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1159          * have an incompatible wider chandef.
1160          */
1161         ieee80211_teardown_tdls_peers(sdata);
1162
1163         mutex_lock(&local->mtx);
1164         mutex_lock(&local->chanctx_mtx);
1165         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1166                                          lockdep_is_held(&local->chanctx_mtx));
1167         if (!conf) {
1168                 sdata_info(sdata,
1169                            "no channel context assigned to vif?, disconnecting\n");
1170                 goto drop_connection;
1171         }
1172
1173         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1174
1175         if (local->use_chanctx &&
1176             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1177                 sdata_info(sdata,
1178                            "driver doesn't support chan-switch with channel contexts\n");
1179                 goto drop_connection;
1180         }
1181
1182         ch_switch.timestamp = timestamp;
1183         ch_switch.device_timestamp = device_timestamp;
1184         ch_switch.block_tx = csa_ie.mode;
1185         ch_switch.chandef = csa_ie.chandef;
1186         ch_switch.count = csa_ie.count;
1187
1188         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1189                 sdata_info(sdata,
1190                            "preparing for channel switch failed, disconnecting\n");
1191                 goto drop_connection;
1192         }
1193
1194         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1195                                             chanctx->mode, false);
1196         if (res) {
1197                 sdata_info(sdata,
1198                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1199                            res);
1200                 goto drop_connection;
1201         }
1202         mutex_unlock(&local->chanctx_mtx);
1203
1204         sdata->vif.csa_active = true;
1205         sdata->csa_chandef = csa_ie.chandef;
1206         sdata->csa_block_tx = csa_ie.mode;
1207         ifmgd->csa_ignored_same_chan = false;
1208
1209         if (sdata->csa_block_tx)
1210                 ieee80211_stop_vif_queues(local, sdata,
1211                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1212         mutex_unlock(&local->mtx);
1213
1214         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1215                                           csa_ie.count);
1216
1217         if (local->ops->channel_switch) {
1218                 /* use driver's channel switch callback */
1219                 drv_channel_switch(local, sdata, &ch_switch);
1220                 return;
1221         }
1222
1223         /* channel switch handled in software */
1224         if (csa_ie.count <= 1)
1225                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1226         else
1227                 mod_timer(&ifmgd->chswitch_timer,
1228                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1229                                          cbss->beacon_interval));
1230         return;
1231  drop_connection:
1232         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1233         mutex_unlock(&local->chanctx_mtx);
1234         mutex_unlock(&local->mtx);
1235 }
1236
1237 static bool
1238 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1239                                  struct ieee80211_channel *channel,
1240                                  const u8 *country_ie, u8 country_ie_len,
1241                                  const u8 *pwr_constr_elem,
1242                                  int *chan_pwr, int *pwr_reduction)
1243 {
1244         struct ieee80211_country_ie_triplet *triplet;
1245         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1246         int i, chan_increment;
1247         bool have_chan_pwr = false;
1248
1249         /* Invalid IE */
1250         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1251                 return false;
1252
1253         triplet = (void *)(country_ie + 3);
1254         country_ie_len -= 3;
1255
1256         switch (channel->band) {
1257         default:
1258                 WARN_ON_ONCE(1);
1259                 /* fall through */
1260         case NL80211_BAND_2GHZ:
1261         case NL80211_BAND_60GHZ:
1262                 chan_increment = 1;
1263                 break;
1264         case NL80211_BAND_5GHZ:
1265                 chan_increment = 4;
1266                 break;
1267         }
1268
1269         /* find channel */
1270         while (country_ie_len >= 3) {
1271                 u8 first_channel = triplet->chans.first_channel;
1272
1273                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1274                         goto next;
1275
1276                 for (i = 0; i < triplet->chans.num_channels; i++) {
1277                         if (first_channel + i * chan_increment == chan) {
1278                                 have_chan_pwr = true;
1279                                 *chan_pwr = triplet->chans.max_power;
1280                                 break;
1281                         }
1282                 }
1283                 if (have_chan_pwr)
1284                         break;
1285
1286  next:
1287                 triplet++;
1288                 country_ie_len -= 3;
1289         }
1290
1291         if (have_chan_pwr && pwr_constr_elem)
1292                 *pwr_reduction = *pwr_constr_elem;
1293         else
1294                 *pwr_reduction = 0;
1295
1296         return have_chan_pwr;
1297 }
1298
1299 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1300                                       struct ieee80211_channel *channel,
1301                                       const u8 *cisco_dtpc_ie,
1302                                       int *pwr_level)
1303 {
1304         /* From practical testing, the first data byte of the DTPC element
1305          * seems to contain the requested dBm level, and the CLI on Cisco
1306          * APs clearly state the range is -127 to 127 dBm, which indicates
1307          * a signed byte, although it seemingly never actually goes negative.
1308          * The other byte seems to always be zero.
1309          */
1310         *pwr_level = (__s8)cisco_dtpc_ie[4];
1311 }
1312
1313 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1314                                        struct ieee80211_channel *channel,
1315                                        struct ieee80211_mgmt *mgmt,
1316                                        const u8 *country_ie, u8 country_ie_len,
1317                                        const u8 *pwr_constr_ie,
1318                                        const u8 *cisco_dtpc_ie)
1319 {
1320         bool has_80211h_pwr = false, has_cisco_pwr = false;
1321         int chan_pwr = 0, pwr_reduction_80211h = 0;
1322         int pwr_level_cisco, pwr_level_80211h;
1323         int new_ap_level;
1324         __le16 capab = mgmt->u.probe_resp.capab_info;
1325
1326         if (country_ie &&
1327             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1328              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1329                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1330                         sdata, channel, country_ie, country_ie_len,
1331                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1332                 pwr_level_80211h =
1333                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1334         }
1335
1336         if (cisco_dtpc_ie) {
1337                 ieee80211_find_cisco_dtpc(
1338                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1339                 has_cisco_pwr = true;
1340         }
1341
1342         if (!has_80211h_pwr && !has_cisco_pwr)
1343                 return 0;
1344
1345         /* If we have both 802.11h and Cisco DTPC, apply both limits
1346          * by picking the smallest of the two power levels advertised.
1347          */
1348         if (has_80211h_pwr &&
1349             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1350                 new_ap_level = pwr_level_80211h;
1351
1352                 if (sdata->ap_power_level == new_ap_level)
1353                         return 0;
1354
1355                 sdata_dbg(sdata,
1356                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1357                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1358                           sdata->u.mgd.bssid);
1359         } else {  /* has_cisco_pwr is always true here. */
1360                 new_ap_level = pwr_level_cisco;
1361
1362                 if (sdata->ap_power_level == new_ap_level)
1363                         return 0;
1364
1365                 sdata_dbg(sdata,
1366                           "Limiting TX power to %d dBm as advertised by %pM\n",
1367                           pwr_level_cisco, sdata->u.mgd.bssid);
1368         }
1369
1370         sdata->ap_power_level = new_ap_level;
1371         if (__ieee80211_recalc_txpower(sdata))
1372                 return BSS_CHANGED_TXPOWER;
1373         return 0;
1374 }
1375
1376 /* powersave */
1377 static void ieee80211_enable_ps(struct ieee80211_local *local,
1378                                 struct ieee80211_sub_if_data *sdata)
1379 {
1380         struct ieee80211_conf *conf = &local->hw.conf;
1381
1382         /*
1383          * If we are scanning right now then the parameters will
1384          * take effect when scan finishes.
1385          */
1386         if (local->scanning)
1387                 return;
1388
1389         if (conf->dynamic_ps_timeout > 0 &&
1390             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1391                 mod_timer(&local->dynamic_ps_timer, jiffies +
1392                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1393         } else {
1394                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1395                         ieee80211_send_nullfunc(local, sdata, true);
1396
1397                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1398                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1399                         return;
1400
1401                 conf->flags |= IEEE80211_CONF_PS;
1402                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1403         }
1404 }
1405
1406 static void ieee80211_change_ps(struct ieee80211_local *local)
1407 {
1408         struct ieee80211_conf *conf = &local->hw.conf;
1409
1410         if (local->ps_sdata) {
1411                 ieee80211_enable_ps(local, local->ps_sdata);
1412         } else if (conf->flags & IEEE80211_CONF_PS) {
1413                 conf->flags &= ~IEEE80211_CONF_PS;
1414                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1415                 del_timer_sync(&local->dynamic_ps_timer);
1416                 cancel_work_sync(&local->dynamic_ps_enable_work);
1417         }
1418 }
1419
1420 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1421 {
1422         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1423         struct sta_info *sta = NULL;
1424         bool authorized = false;
1425
1426         if (!mgd->powersave)
1427                 return false;
1428
1429         if (mgd->broken_ap)
1430                 return false;
1431
1432         if (!mgd->associated)
1433                 return false;
1434
1435         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1436                 return false;
1437
1438         if (!mgd->have_beacon)
1439                 return false;
1440
1441         rcu_read_lock();
1442         sta = sta_info_get(sdata, mgd->bssid);
1443         if (sta)
1444                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1445         rcu_read_unlock();
1446
1447         return authorized;
1448 }
1449
1450 /* need to hold RTNL or interface lock */
1451 void ieee80211_recalc_ps(struct ieee80211_local *local)
1452 {
1453         struct ieee80211_sub_if_data *sdata, *found = NULL;
1454         int count = 0;
1455         int timeout;
1456
1457         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1458                 local->ps_sdata = NULL;
1459                 return;
1460         }
1461
1462         list_for_each_entry(sdata, &local->interfaces, list) {
1463                 if (!ieee80211_sdata_running(sdata))
1464                         continue;
1465                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1466                         /* If an AP vif is found, then disable PS
1467                          * by setting the count to zero thereby setting
1468                          * ps_sdata to NULL.
1469                          */
1470                         count = 0;
1471                         break;
1472                 }
1473                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1474                         continue;
1475                 found = sdata;
1476                 count++;
1477         }
1478
1479         if (count == 1 && ieee80211_powersave_allowed(found)) {
1480                 u8 dtimper = found->u.mgd.dtim_period;
1481                 s32 beaconint_us;
1482
1483                 beaconint_us = ieee80211_tu_to_usec(
1484                                         found->vif.bss_conf.beacon_int);
1485
1486                 timeout = local->dynamic_ps_forced_timeout;
1487                 if (timeout < 0)
1488                         timeout = 100;
1489                 local->hw.conf.dynamic_ps_timeout = timeout;
1490
1491                 /* If the TIM IE is invalid, pretend the value is 1 */
1492                 if (!dtimper)
1493                         dtimper = 1;
1494
1495                 local->hw.conf.ps_dtim_period = dtimper;
1496                 local->ps_sdata = found;
1497         } else {
1498                 local->ps_sdata = NULL;
1499         }
1500
1501         ieee80211_change_ps(local);
1502 }
1503
1504 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1505 {
1506         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1507
1508         if (sdata->vif.bss_conf.ps != ps_allowed) {
1509                 sdata->vif.bss_conf.ps = ps_allowed;
1510                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1511         }
1512 }
1513
1514 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1515 {
1516         struct ieee80211_local *local =
1517                 container_of(work, struct ieee80211_local,
1518                              dynamic_ps_disable_work);
1519
1520         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1521                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1522                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1523         }
1524
1525         ieee80211_wake_queues_by_reason(&local->hw,
1526                                         IEEE80211_MAX_QUEUE_MAP,
1527                                         IEEE80211_QUEUE_STOP_REASON_PS,
1528                                         false);
1529 }
1530
1531 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1532 {
1533         struct ieee80211_local *local =
1534                 container_of(work, struct ieee80211_local,
1535                              dynamic_ps_enable_work);
1536         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1537         struct ieee80211_if_managed *ifmgd;
1538         unsigned long flags;
1539         int q;
1540
1541         /* can only happen when PS was just disabled anyway */
1542         if (!sdata)
1543                 return;
1544
1545         ifmgd = &sdata->u.mgd;
1546
1547         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1548                 return;
1549
1550         if (local->hw.conf.dynamic_ps_timeout > 0) {
1551                 /* don't enter PS if TX frames are pending */
1552                 if (drv_tx_frames_pending(local)) {
1553                         mod_timer(&local->dynamic_ps_timer, jiffies +
1554                                   msecs_to_jiffies(
1555                                   local->hw.conf.dynamic_ps_timeout));
1556                         return;
1557                 }
1558
1559                 /*
1560                  * transmission can be stopped by others which leads to
1561                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1562                  * is not the actual idle state.
1563                  */
1564                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1565                 for (q = 0; q < local->hw.queues; q++) {
1566                         if (local->queue_stop_reasons[q]) {
1567                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1568                                                        flags);
1569                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1570                                           msecs_to_jiffies(
1571                                           local->hw.conf.dynamic_ps_timeout));
1572                                 return;
1573                         }
1574                 }
1575                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1576         }
1577
1578         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1579             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1580                 if (drv_tx_frames_pending(local)) {
1581                         mod_timer(&local->dynamic_ps_timer, jiffies +
1582                                   msecs_to_jiffies(
1583                                   local->hw.conf.dynamic_ps_timeout));
1584                 } else {
1585                         ieee80211_send_nullfunc(local, sdata, true);
1586                         /* Flush to get the tx status of nullfunc frame */
1587                         ieee80211_flush_queues(local, sdata, false);
1588                 }
1589         }
1590
1591         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1592               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1593             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1594                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1595                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1596                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1597         }
1598 }
1599
1600 void ieee80211_dynamic_ps_timer(unsigned long data)
1601 {
1602         struct ieee80211_local *local = (void *) data;
1603
1604         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1605 }
1606
1607 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1608 {
1609         struct delayed_work *delayed_work = to_delayed_work(work);
1610         struct ieee80211_sub_if_data *sdata =
1611                 container_of(delayed_work, struct ieee80211_sub_if_data,
1612                              dfs_cac_timer_work);
1613         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1614
1615         mutex_lock(&sdata->local->mtx);
1616         if (sdata->wdev.cac_started) {
1617                 ieee80211_vif_release_channel(sdata);
1618                 cfg80211_cac_event(sdata->dev, &chandef,
1619                                    NL80211_RADAR_CAC_FINISHED,
1620                                    GFP_KERNEL);
1621         }
1622         mutex_unlock(&sdata->local->mtx);
1623 }
1624
1625 static bool
1626 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1627 {
1628         struct ieee80211_local *local = sdata->local;
1629         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1630         bool ret = false;
1631         int ac;
1632
1633         if (local->hw.queues < IEEE80211_NUM_ACS)
1634                 return false;
1635
1636         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1637                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1638                 int non_acm_ac;
1639                 unsigned long now = jiffies;
1640
1641                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1642                     tx_tspec->admitted_time &&
1643                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1644                         tx_tspec->consumed_tx_time = 0;
1645                         tx_tspec->time_slice_start = now;
1646
1647                         if (tx_tspec->downgraded)
1648                                 tx_tspec->action =
1649                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1650                 }
1651
1652                 switch (tx_tspec->action) {
1653                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1654                         /* take the original parameters */
1655                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1656                                 sdata_err(sdata,
1657                                           "failed to set TX queue parameters for queue %d\n",
1658                                           ac);
1659                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1660                         tx_tspec->downgraded = false;
1661                         ret = true;
1662                         break;
1663                 case TX_TSPEC_ACTION_DOWNGRADE:
1664                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1665                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1666                                 ret = true;
1667                                 break;
1668                         }
1669                         /* downgrade next lower non-ACM AC */
1670                         for (non_acm_ac = ac + 1;
1671                              non_acm_ac < IEEE80211_NUM_ACS;
1672                              non_acm_ac++)
1673                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1674                                         break;
1675                         /* The loop will result in using BK even if it requires
1676                          * admission control, such configuration makes no sense
1677                          * and we have to transmit somehow - the AC selection
1678                          * does the same thing.
1679                          */
1680                         if (drv_conf_tx(local, sdata, ac,
1681                                         &sdata->tx_conf[non_acm_ac]))
1682                                 sdata_err(sdata,
1683                                           "failed to set TX queue parameters for queue %d\n",
1684                                           ac);
1685                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1686                         ret = true;
1687                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1688                                 tx_tspec->time_slice_start + HZ - now + 1);
1689                         break;
1690                 case TX_TSPEC_ACTION_NONE:
1691                         /* nothing now */
1692                         break;
1693                 }
1694         }
1695
1696         return ret;
1697 }
1698
1699 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1700 {
1701         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1702                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1703 }
1704
1705 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1706 {
1707         struct ieee80211_sub_if_data *sdata;
1708
1709         sdata = container_of(work, struct ieee80211_sub_if_data,
1710                              u.mgd.tx_tspec_wk.work);
1711         ieee80211_sta_handle_tspec_ac_params(sdata);
1712 }
1713
1714 /* MLME */
1715 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1716                                      struct ieee80211_sub_if_data *sdata,
1717                                      const u8 *wmm_param, size_t wmm_param_len)
1718 {
1719         struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1720         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1721         size_t left;
1722         int count, ac;
1723         const u8 *pos;
1724         u8 uapsd_queues = 0;
1725
1726         if (!local->ops->conf_tx)
1727                 return false;
1728
1729         if (local->hw.queues < IEEE80211_NUM_ACS)
1730                 return false;
1731
1732         if (!wmm_param)
1733                 return false;
1734
1735         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1736                 return false;
1737
1738         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1739                 uapsd_queues = ifmgd->uapsd_queues;
1740
1741         count = wmm_param[6] & 0x0f;
1742         if (count == ifmgd->wmm_last_param_set)
1743                 return false;
1744         ifmgd->wmm_last_param_set = count;
1745
1746         pos = wmm_param + 8;
1747         left = wmm_param_len - 8;
1748
1749         memset(&params, 0, sizeof(params));
1750
1751         sdata->wmm_acm = 0;
1752         for (; left >= 4; left -= 4, pos += 4) {
1753                 int aci = (pos[0] >> 5) & 0x03;
1754                 int acm = (pos[0] >> 4) & 0x01;
1755                 bool uapsd = false;
1756
1757                 switch (aci) {
1758                 case 1: /* AC_BK */
1759                         ac = IEEE80211_AC_BK;
1760                         if (acm)
1761                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1762                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1763                                 uapsd = true;
1764                         break;
1765                 case 2: /* AC_VI */
1766                         ac = IEEE80211_AC_VI;
1767                         if (acm)
1768                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1769                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1770                                 uapsd = true;
1771                         break;
1772                 case 3: /* AC_VO */
1773                         ac = IEEE80211_AC_VO;
1774                         if (acm)
1775                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1776                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1777                                 uapsd = true;
1778                         break;
1779                 case 0: /* AC_BE */
1780                 default:
1781                         ac = IEEE80211_AC_BE;
1782                         if (acm)
1783                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1784                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1785                                 uapsd = true;
1786                         break;
1787                 }
1788
1789                 params[ac].aifs = pos[0] & 0x0f;
1790
1791                 if (params[ac].aifs < 2) {
1792                         sdata_info(sdata,
1793                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1794                                    params[ac].aifs, aci);
1795                         params[ac].aifs = 2;
1796                 }
1797                 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1798                 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1799                 params[ac].txop = get_unaligned_le16(pos + 2);
1800                 params[ac].acm = acm;
1801                 params[ac].uapsd = uapsd;
1802
1803                 if (params[ac].cw_min > params[ac].cw_max) {
1804                         sdata_info(sdata,
1805                                    "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1806                                    params[ac].cw_min, params[ac].cw_max, aci);
1807                         return false;
1808                 }
1809         }
1810
1811         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1812                 mlme_dbg(sdata,
1813                          "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1814                          ac, params[ac].acm,
1815                          params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1816                          params[ac].txop, params[ac].uapsd,
1817                          ifmgd->tx_tspec[ac].downgraded);
1818                 sdata->tx_conf[ac] = params[ac];
1819                 if (!ifmgd->tx_tspec[ac].downgraded &&
1820                     drv_conf_tx(local, sdata, ac, &params[ac]))
1821                         sdata_err(sdata,
1822                                   "failed to set TX queue parameters for AC %d\n",
1823                                   ac);
1824         }
1825
1826         /* enable WMM or activate new settings */
1827         sdata->vif.bss_conf.qos = true;
1828         return true;
1829 }
1830
1831 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1832 {
1833         lockdep_assert_held(&sdata->local->mtx);
1834
1835         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1836         ieee80211_run_deferred_scan(sdata->local);
1837 }
1838
1839 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1840 {
1841         mutex_lock(&sdata->local->mtx);
1842         __ieee80211_stop_poll(sdata);
1843         mutex_unlock(&sdata->local->mtx);
1844 }
1845
1846 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1847                                            u16 capab, bool erp_valid, u8 erp)
1848 {
1849         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1850         u32 changed = 0;
1851         bool use_protection;
1852         bool use_short_preamble;
1853         bool use_short_slot;
1854
1855         if (erp_valid) {
1856                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1857                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1858         } else {
1859                 use_protection = false;
1860                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1861         }
1862
1863         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1864         if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_5GHZ)
1865                 use_short_slot = true;
1866
1867         if (use_protection != bss_conf->use_cts_prot) {
1868                 bss_conf->use_cts_prot = use_protection;
1869                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1870         }
1871
1872         if (use_short_preamble != bss_conf->use_short_preamble) {
1873                 bss_conf->use_short_preamble = use_short_preamble;
1874                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1875         }
1876
1877         if (use_short_slot != bss_conf->use_short_slot) {
1878                 bss_conf->use_short_slot = use_short_slot;
1879                 changed |= BSS_CHANGED_ERP_SLOT;
1880         }
1881
1882         return changed;
1883 }
1884
1885 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1886                                      struct cfg80211_bss *cbss,
1887                                      u32 bss_info_changed)
1888 {
1889         struct ieee80211_bss *bss = (void *)cbss->priv;
1890         struct ieee80211_local *local = sdata->local;
1891         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1892
1893         bss_info_changed |= BSS_CHANGED_ASSOC;
1894         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1895                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1896
1897         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1898                 beacon_loss_count * bss_conf->beacon_int));
1899
1900         sdata->u.mgd.associated = cbss;
1901         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1902
1903         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1904
1905         if (sdata->vif.p2p ||
1906             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1907                 const struct cfg80211_bss_ies *ies;
1908
1909                 rcu_read_lock();
1910                 ies = rcu_dereference(cbss->ies);
1911                 if (ies) {
1912                         int ret;
1913
1914                         ret = cfg80211_get_p2p_attr(
1915                                         ies->data, ies->len,
1916                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1917                                         (u8 *) &bss_conf->p2p_noa_attr,
1918                                         sizeof(bss_conf->p2p_noa_attr));
1919                         if (ret >= 2) {
1920                                 sdata->u.mgd.p2p_noa_index =
1921                                         bss_conf->p2p_noa_attr.index;
1922                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1923                         }
1924                 }
1925                 rcu_read_unlock();
1926         }
1927
1928         /* just to be sure */
1929         ieee80211_stop_poll(sdata);
1930
1931         ieee80211_led_assoc(local, 1);
1932
1933         if (sdata->u.mgd.have_beacon) {
1934                 /*
1935                  * If the AP is buggy we may get here with no DTIM period
1936                  * known, so assume it's 1 which is the only safe assumption
1937                  * in that case, although if the TIM IE is broken powersave
1938                  * probably just won't work at all.
1939                  */
1940                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1941                 bss_conf->beacon_rate = bss->beacon_rate;
1942                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1943         } else {
1944                 bss_conf->beacon_rate = NULL;
1945                 bss_conf->dtim_period = 0;
1946         }
1947
1948         bss_conf->assoc = 1;
1949
1950         /* Tell the driver to monitor connection quality (if supported) */
1951         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1952             bss_conf->cqm_rssi_thold)
1953                 bss_info_changed |= BSS_CHANGED_CQM;
1954
1955         /* Enable ARP filtering */
1956         if (bss_conf->arp_addr_cnt)
1957                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1958
1959         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1960
1961         mutex_lock(&local->iflist_mtx);
1962         ieee80211_recalc_ps(local);
1963         mutex_unlock(&local->iflist_mtx);
1964
1965         ieee80211_recalc_smps(sdata);
1966         ieee80211_recalc_ps_vif(sdata);
1967
1968         netif_carrier_on(sdata->dev);
1969 }
1970
1971 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1972                                    u16 stype, u16 reason, bool tx,
1973                                    u8 *frame_buf)
1974 {
1975         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1976         struct ieee80211_local *local = sdata->local;
1977         u32 changed = 0;
1978
1979         sdata_assert_lock(sdata);
1980
1981         if (WARN_ON_ONCE(tx && !frame_buf))
1982                 return;
1983
1984         if (WARN_ON(!ifmgd->associated))
1985                 return;
1986
1987         ieee80211_stop_poll(sdata);
1988
1989         ifmgd->associated = NULL;
1990         netif_carrier_off(sdata->dev);
1991
1992         /*
1993          * if we want to get out of ps before disassoc (why?) we have
1994          * to do it before sending disassoc, as otherwise the null-packet
1995          * won't be valid.
1996          */
1997         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1998                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1999                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2000         }
2001         local->ps_sdata = NULL;
2002
2003         /* disable per-vif ps */
2004         ieee80211_recalc_ps_vif(sdata);
2005
2006         /* make sure ongoing transmission finishes */
2007         synchronize_net();
2008
2009         /*
2010          * drop any frame before deauth/disassoc, this can be data or
2011          * management frame. Since we are disconnecting, we should not
2012          * insist sending these frames which can take time and delay
2013          * the disconnection and possible the roaming.
2014          */
2015         if (tx)
2016                 ieee80211_flush_queues(local, sdata, true);
2017
2018         /* deauthenticate/disassociate now */
2019         if (tx || frame_buf)
2020                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2021                                                reason, tx, frame_buf);
2022
2023         /* flush out frame - make sure the deauth was actually sent */
2024         if (tx)
2025                 ieee80211_flush_queues(local, sdata, false);
2026
2027         /* clear bssid only after building the needed mgmt frames */
2028         eth_zero_addr(ifmgd->bssid);
2029
2030         /* remove AP and TDLS peers */
2031         sta_info_flush(sdata);
2032
2033         /* finally reset all BSS / config parameters */
2034         changed |= ieee80211_reset_erp_info(sdata);
2035
2036         ieee80211_led_assoc(local, 0);
2037         changed |= BSS_CHANGED_ASSOC;
2038         sdata->vif.bss_conf.assoc = false;
2039
2040         ifmgd->p2p_noa_index = -1;
2041         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2042                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2043
2044         /* on the next assoc, re-program HT/VHT parameters */
2045         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2046         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2047         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2048         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2049
2050         /* reset MU-MIMO ownership and group data */
2051         memset(sdata->vif.bss_conf.mu_group.membership, 0,
2052                sizeof(sdata->vif.bss_conf.mu_group.membership));
2053         memset(sdata->vif.bss_conf.mu_group.position, 0,
2054                sizeof(sdata->vif.bss_conf.mu_group.position));
2055         changed |= BSS_CHANGED_MU_GROUPS;
2056         sdata->vif.mu_mimo_owner = false;
2057
2058         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2059
2060         del_timer_sync(&local->dynamic_ps_timer);
2061         cancel_work_sync(&local->dynamic_ps_enable_work);
2062
2063         /* Disable ARP filtering */
2064         if (sdata->vif.bss_conf.arp_addr_cnt)
2065                 changed |= BSS_CHANGED_ARP_FILTER;
2066
2067         sdata->vif.bss_conf.qos = false;
2068         changed |= BSS_CHANGED_QOS;
2069
2070         /* The BSSID (not really interesting) and HT changed */
2071         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2072         ieee80211_bss_info_change_notify(sdata, changed);
2073
2074         /* disassociated - set to defaults now */
2075         ieee80211_set_wmm_default(sdata, false, false);
2076
2077         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2078         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2079         del_timer_sync(&sdata->u.mgd.timer);
2080         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2081
2082         sdata->vif.bss_conf.dtim_period = 0;
2083         sdata->vif.bss_conf.beacon_rate = NULL;
2084
2085         ifmgd->have_beacon = false;
2086
2087         ifmgd->flags = 0;
2088         mutex_lock(&local->mtx);
2089         ieee80211_vif_release_channel(sdata);
2090
2091         sdata->vif.csa_active = false;
2092         ifmgd->csa_waiting_bcn = false;
2093         ifmgd->csa_ignored_same_chan = false;
2094         if (sdata->csa_block_tx) {
2095                 ieee80211_wake_vif_queues(local, sdata,
2096                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2097                 sdata->csa_block_tx = false;
2098         }
2099         mutex_unlock(&local->mtx);
2100
2101         /* existing TX TSPEC sessions no longer exist */
2102         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2103         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2104
2105         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2106 }
2107
2108 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2109                              struct ieee80211_hdr *hdr)
2110 {
2111         /*
2112          * We can postpone the mgd.timer whenever receiving unicast frames
2113          * from AP because we know that the connection is working both ways
2114          * at that time. But multicast frames (and hence also beacons) must
2115          * be ignored here, because we need to trigger the timer during
2116          * data idle periods for sending the periodic probe request to the
2117          * AP we're connected to.
2118          */
2119         if (is_multicast_ether_addr(hdr->addr1))
2120                 return;
2121
2122         ieee80211_sta_reset_conn_monitor(sdata);
2123 }
2124
2125 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2126 {
2127         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2128         struct ieee80211_local *local = sdata->local;
2129
2130         mutex_lock(&local->mtx);
2131         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2132                 goto out;
2133
2134         __ieee80211_stop_poll(sdata);
2135
2136         mutex_lock(&local->iflist_mtx);
2137         ieee80211_recalc_ps(local);
2138         mutex_unlock(&local->iflist_mtx);
2139
2140         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2141                 goto out;
2142
2143         /*
2144          * We've received a probe response, but are not sure whether
2145          * we have or will be receiving any beacons or data, so let's
2146          * schedule the timers again, just in case.
2147          */
2148         ieee80211_sta_reset_beacon_monitor(sdata);
2149
2150         mod_timer(&ifmgd->conn_mon_timer,
2151                   round_jiffies_up(jiffies +
2152                                    IEEE80211_CONNECTION_IDLE_TIME));
2153 out:
2154         mutex_unlock(&local->mtx);
2155 }
2156
2157 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2158                                            struct ieee80211_hdr *hdr,
2159                                            u16 tx_time)
2160 {
2161         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2162         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2163         int ac = ieee80211_ac_from_tid(tid);
2164         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2165         unsigned long now = jiffies;
2166
2167         if (likely(!tx_tspec->admitted_time))
2168                 return;
2169
2170         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2171                 tx_tspec->consumed_tx_time = 0;
2172                 tx_tspec->time_slice_start = now;
2173
2174                 if (tx_tspec->downgraded) {
2175                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2176                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2177                 }
2178         }
2179
2180         if (tx_tspec->downgraded)
2181                 return;
2182
2183         tx_tspec->consumed_tx_time += tx_time;
2184
2185         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2186                 tx_tspec->downgraded = true;
2187                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2188                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2189         }
2190 }
2191
2192 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2193                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2194 {
2195         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2196
2197         if (!ieee80211_is_data(hdr->frame_control))
2198             return;
2199
2200         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2201             sdata->u.mgd.probe_send_count > 0) {
2202                 if (ack)
2203                         ieee80211_sta_reset_conn_monitor(sdata);
2204                 else
2205                         sdata->u.mgd.nullfunc_failed = true;
2206                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2207                 return;
2208         }
2209
2210         if (ack)
2211                 ieee80211_sta_reset_conn_monitor(sdata);
2212 }
2213
2214 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2215 {
2216         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2217         const u8 *ssid;
2218         u8 *dst = ifmgd->associated->bssid;
2219         u8 unicast_limit = max(1, max_probe_tries - 3);
2220         struct sta_info *sta;
2221
2222         /*
2223          * Try sending broadcast probe requests for the last three
2224          * probe requests after the first ones failed since some
2225          * buggy APs only support broadcast probe requests.
2226          */
2227         if (ifmgd->probe_send_count >= unicast_limit)
2228                 dst = NULL;
2229
2230         /*
2231          * When the hardware reports an accurate Tx ACK status, it's
2232          * better to send a nullfunc frame instead of a probe request,
2233          * as it will kick us off the AP quickly if we aren't associated
2234          * anymore. The timeout will be reset if the frame is ACKed by
2235          * the AP.
2236          */
2237         ifmgd->probe_send_count++;
2238
2239         if (dst) {
2240                 mutex_lock(&sdata->local->sta_mtx);
2241                 sta = sta_info_get(sdata, dst);
2242                 if (!WARN_ON(!sta))
2243                         ieee80211_check_fast_rx(sta);
2244                 mutex_unlock(&sdata->local->sta_mtx);
2245         }
2246
2247         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2248                 ifmgd->nullfunc_failed = false;
2249                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2250         } else {
2251                 int ssid_len;
2252
2253                 rcu_read_lock();
2254                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2255                 if (WARN_ON_ONCE(ssid == NULL))
2256                         ssid_len = 0;
2257                 else
2258                         ssid_len = ssid[1];
2259
2260                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2261                                          ssid + 2, ssid_len, NULL,
2262                                          0, (u32) -1, true, 0,
2263                                          ifmgd->associated->channel, false);
2264                 rcu_read_unlock();
2265         }
2266
2267         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2268         run_again(sdata, ifmgd->probe_timeout);
2269 }
2270
2271 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2272                                    bool beacon)
2273 {
2274         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2275         bool already = false;
2276
2277         if (!ieee80211_sdata_running(sdata))
2278                 return;
2279
2280         sdata_lock(sdata);
2281
2282         if (!ifmgd->associated)
2283                 goto out;
2284
2285         mutex_lock(&sdata->local->mtx);
2286
2287         if (sdata->local->tmp_channel || sdata->local->scanning) {
2288                 mutex_unlock(&sdata->local->mtx);
2289                 goto out;
2290         }
2291
2292         if (beacon) {
2293                 mlme_dbg_ratelimited(sdata,
2294                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2295                                      beacon_loss_count);
2296
2297                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2298         }
2299
2300         /*
2301          * The driver/our work has already reported this event or the
2302          * connection monitoring has kicked in and we have already sent
2303          * a probe request. Or maybe the AP died and the driver keeps
2304          * reporting until we disassociate...
2305          *
2306          * In either case we have to ignore the current call to this
2307          * function (except for setting the correct probe reason bit)
2308          * because otherwise we would reset the timer every time and
2309          * never check whether we received a probe response!
2310          */
2311         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2312                 already = true;
2313
2314         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2315
2316         mutex_unlock(&sdata->local->mtx);
2317
2318         if (already)
2319                 goto out;
2320
2321         mutex_lock(&sdata->local->iflist_mtx);
2322         ieee80211_recalc_ps(sdata->local);
2323         mutex_unlock(&sdata->local->iflist_mtx);
2324
2325         ifmgd->probe_send_count = 0;
2326         ieee80211_mgd_probe_ap_send(sdata);
2327  out:
2328         sdata_unlock(sdata);
2329 }
2330
2331 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2332                                           struct ieee80211_vif *vif)
2333 {
2334         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2335         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2336         struct cfg80211_bss *cbss;
2337         struct sk_buff *skb;
2338         const u8 *ssid;
2339         int ssid_len;
2340
2341         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2342                 return NULL;
2343
2344         sdata_assert_lock(sdata);
2345
2346         if (ifmgd->associated)
2347                 cbss = ifmgd->associated;
2348         else if (ifmgd->auth_data)
2349                 cbss = ifmgd->auth_data->bss;
2350         else if (ifmgd->assoc_data)
2351                 cbss = ifmgd->assoc_data->bss;
2352         else
2353                 return NULL;
2354
2355         rcu_read_lock();
2356         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2357         if (WARN_ON_ONCE(ssid == NULL))
2358                 ssid_len = 0;
2359         else
2360                 ssid_len = ssid[1];
2361
2362         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2363                                         (u32) -1, cbss->channel,
2364                                         ssid + 2, ssid_len,
2365                                         NULL, 0, true);
2366         rcu_read_unlock();
2367
2368         return skb;
2369 }
2370 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2371
2372 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2373                                         const u8 *buf, size_t len, bool tx,
2374                                         u16 reason)
2375 {
2376         struct ieee80211_event event = {
2377                 .type = MLME_EVENT,
2378                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2379                 .u.mlme.reason = reason,
2380         };
2381
2382         if (tx)
2383                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2384         else
2385                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2386
2387         drv_event_callback(sdata->local, sdata, &event);
2388 }
2389
2390 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2391 {
2392         struct ieee80211_local *local = sdata->local;
2393         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2394         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2395
2396         sdata_lock(sdata);
2397         if (!ifmgd->associated) {
2398                 sdata_unlock(sdata);
2399                 return;
2400         }
2401
2402         /* AP is probably out of range (or not reachable for another reason) so
2403          * remove the bss struct for that AP.
2404          */
2405         cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
2406
2407         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2408                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2409                                true, frame_buf);
2410         mutex_lock(&local->mtx);
2411         sdata->vif.csa_active = false;
2412         ifmgd->csa_waiting_bcn = false;
2413         if (sdata->csa_block_tx) {
2414                 ieee80211_wake_vif_queues(local, sdata,
2415                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2416                 sdata->csa_block_tx = false;
2417         }
2418         mutex_unlock(&local->mtx);
2419
2420         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2421                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2422
2423         sdata_unlock(sdata);
2424 }
2425
2426 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2427 {
2428         struct ieee80211_sub_if_data *sdata =
2429                 container_of(work, struct ieee80211_sub_if_data,
2430                              u.mgd.beacon_connection_loss_work);
2431         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2432
2433         if (ifmgd->associated)
2434                 ifmgd->beacon_loss_count++;
2435
2436         if (ifmgd->connection_loss) {
2437                 sdata_info(sdata, "Connection to AP %pM lost\n",
2438                            ifmgd->bssid);
2439                 __ieee80211_disconnect(sdata);
2440         } else {
2441                 ieee80211_mgd_probe_ap(sdata, true);
2442         }
2443 }
2444
2445 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2446 {
2447         struct ieee80211_sub_if_data *sdata =
2448                 container_of(work, struct ieee80211_sub_if_data,
2449                              u.mgd.csa_connection_drop_work);
2450
2451         __ieee80211_disconnect(sdata);
2452 }
2453
2454 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2455 {
2456         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2457         struct ieee80211_hw *hw = &sdata->local->hw;
2458
2459         trace_api_beacon_loss(sdata);
2460
2461         sdata->u.mgd.connection_loss = false;
2462         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2463 }
2464 EXPORT_SYMBOL(ieee80211_beacon_loss);
2465
2466 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2467 {
2468         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2469         struct ieee80211_hw *hw = &sdata->local->hw;
2470
2471         trace_api_connection_loss(sdata);
2472
2473         sdata->u.mgd.connection_loss = true;
2474         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2475 }
2476 EXPORT_SYMBOL(ieee80211_connection_loss);
2477
2478
2479 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2480                                         bool assoc)
2481 {
2482         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2483
2484         sdata_assert_lock(sdata);
2485
2486         if (!assoc) {
2487                 /*
2488                  * we are not authenticated yet, the only timer that could be
2489                  * running is the timeout for the authentication response which
2490                  * which is not relevant anymore.
2491                  */
2492                 del_timer_sync(&sdata->u.mgd.timer);
2493                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2494
2495                 eth_zero_addr(sdata->u.mgd.bssid);
2496                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2497                 sdata->u.mgd.flags = 0;
2498                 mutex_lock(&sdata->local->mtx);
2499                 ieee80211_vif_release_channel(sdata);
2500                 mutex_unlock(&sdata->local->mtx);
2501         }
2502
2503         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2504         kfree(auth_data);
2505         sdata->u.mgd.auth_data = NULL;
2506 }
2507
2508 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2509                                          bool assoc)
2510 {
2511         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2512
2513         sdata_assert_lock(sdata);
2514
2515         if (!assoc) {
2516                 /*
2517                  * we are not associated yet, the only timer that could be
2518                  * running is the timeout for the association response which
2519                  * which is not relevant anymore.
2520                  */
2521                 del_timer_sync(&sdata->u.mgd.timer);
2522                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2523
2524                 eth_zero_addr(sdata->u.mgd.bssid);
2525                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2526                 sdata->u.mgd.flags = 0;
2527                 sdata->vif.mu_mimo_owner = false;
2528
2529                 mutex_lock(&sdata->local->mtx);
2530                 ieee80211_vif_release_channel(sdata);
2531                 mutex_unlock(&sdata->local->mtx);
2532         }
2533
2534         kfree(assoc_data);
2535         sdata->u.mgd.assoc_data = NULL;
2536 }
2537
2538 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2539                                      struct ieee80211_mgmt *mgmt, size_t len)
2540 {
2541         struct ieee80211_local *local = sdata->local;
2542         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2543         u8 *pos;
2544         struct ieee802_11_elems elems;
2545         u32 tx_flags = 0;
2546
2547         pos = mgmt->u.auth.variable;
2548         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2549         if (!elems.challenge)
2550                 return;
2551         auth_data->expected_transaction = 4;
2552         drv_mgd_prepare_tx(sdata->local, sdata);
2553         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2554                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2555                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2556         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2557                             elems.challenge - 2, elems.challenge_len + 2,
2558                             auth_data->bss->bssid, auth_data->bss->bssid,
2559                             auth_data->key, auth_data->key_len,
2560                             auth_data->key_idx, tx_flags);
2561 }
2562
2563 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2564                                    struct ieee80211_mgmt *mgmt, size_t len)
2565 {
2566         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2567         u8 bssid[ETH_ALEN];
2568         u16 auth_alg, auth_transaction, status_code;
2569         struct sta_info *sta;
2570         struct ieee80211_event event = {
2571                 .type = MLME_EVENT,
2572                 .u.mlme.data = AUTH_EVENT,
2573         };
2574
2575         sdata_assert_lock(sdata);
2576
2577         if (len < 24 + 6)
2578                 return;
2579
2580         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2581                 return;
2582
2583         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2584
2585         if (!ether_addr_equal(bssid, mgmt->bssid))
2586                 return;
2587
2588         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2589         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2590         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2591
2592         if (auth_alg != ifmgd->auth_data->algorithm ||
2593             auth_transaction != ifmgd->auth_data->expected_transaction) {
2594                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2595                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2596                            auth_transaction,
2597                            ifmgd->auth_data->expected_transaction);
2598                 return;
2599         }
2600
2601         if (status_code != WLAN_STATUS_SUCCESS) {
2602                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2603                            mgmt->sa, status_code);
2604                 ieee80211_destroy_auth_data(sdata, false);
2605                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2606                 event.u.mlme.status = MLME_DENIED;
2607                 event.u.mlme.reason = status_code;
2608                 drv_event_callback(sdata->local, sdata, &event);
2609                 return;
2610         }
2611
2612         switch (ifmgd->auth_data->algorithm) {
2613         case WLAN_AUTH_OPEN:
2614         case WLAN_AUTH_LEAP:
2615         case WLAN_AUTH_FT:
2616         case WLAN_AUTH_SAE:
2617                 break;
2618         case WLAN_AUTH_SHARED_KEY:
2619                 if (ifmgd->auth_data->expected_transaction != 4) {
2620                         ieee80211_auth_challenge(sdata, mgmt, len);
2621                         /* need another frame */
2622                         return;
2623                 }
2624                 break;
2625         default:
2626                 WARN_ONCE(1, "invalid auth alg %d",
2627                           ifmgd->auth_data->algorithm);
2628                 return;
2629         }
2630
2631         event.u.mlme.status = MLME_SUCCESS;
2632         drv_event_callback(sdata->local, sdata, &event);
2633         sdata_info(sdata, "authenticated\n");
2634         ifmgd->auth_data->done = true;
2635         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2636         ifmgd->auth_data->timeout_started = true;
2637         run_again(sdata, ifmgd->auth_data->timeout);
2638
2639         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2640             ifmgd->auth_data->expected_transaction != 2) {
2641                 /*
2642                  * Report auth frame to user space for processing since another
2643                  * round of Authentication frames is still needed.
2644                  */
2645                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2646                 return;
2647         }
2648
2649         /* move station state to auth */
2650         mutex_lock(&sdata->local->sta_mtx);
2651         sta = sta_info_get(sdata, bssid);
2652         if (!sta) {
2653                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2654                 goto out_err;
2655         }
2656         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2657                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2658                 goto out_err;
2659         }
2660         mutex_unlock(&sdata->local->sta_mtx);
2661
2662         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2663         return;
2664  out_err:
2665         mutex_unlock(&sdata->local->sta_mtx);
2666         /* ignore frame -- wait for timeout */
2667 }
2668
2669 #define case_WLAN(type) \
2670         case WLAN_REASON_##type: return #type
2671
2672 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2673 {
2674         switch (reason_code) {
2675         case_WLAN(UNSPECIFIED);
2676         case_WLAN(PREV_AUTH_NOT_VALID);
2677         case_WLAN(DEAUTH_LEAVING);
2678         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2679         case_WLAN(DISASSOC_AP_BUSY);
2680         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2681         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2682         case_WLAN(DISASSOC_STA_HAS_LEFT);
2683         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2684         case_WLAN(DISASSOC_BAD_POWER);
2685         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2686         case_WLAN(INVALID_IE);
2687         case_WLAN(MIC_FAILURE);
2688         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2689         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2690         case_WLAN(IE_DIFFERENT);
2691         case_WLAN(INVALID_GROUP_CIPHER);
2692         case_WLAN(INVALID_PAIRWISE_CIPHER);
2693         case_WLAN(INVALID_AKMP);
2694         case_WLAN(UNSUPP_RSN_VERSION);
2695         case_WLAN(INVALID_RSN_IE_CAP);
2696         case_WLAN(IEEE8021X_FAILED);
2697         case_WLAN(CIPHER_SUITE_REJECTED);
2698         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2699         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2700         case_WLAN(DISASSOC_LOW_ACK);
2701         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2702         case_WLAN(QSTA_LEAVE_QBSS);
2703         case_WLAN(QSTA_NOT_USE);
2704         case_WLAN(QSTA_REQUIRE_SETUP);
2705         case_WLAN(QSTA_TIMEOUT);
2706         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2707         case_WLAN(MESH_PEER_CANCELED);
2708         case_WLAN(MESH_MAX_PEERS);
2709         case_WLAN(MESH_CONFIG);
2710         case_WLAN(MESH_CLOSE);
2711         case_WLAN(MESH_MAX_RETRIES);
2712         case_WLAN(MESH_CONFIRM_TIMEOUT);
2713         case_WLAN(MESH_INVALID_GTK);
2714         case_WLAN(MESH_INCONSISTENT_PARAM);
2715         case_WLAN(MESH_INVALID_SECURITY);
2716         case_WLAN(MESH_PATH_ERROR);
2717         case_WLAN(MESH_PATH_NOFORWARD);
2718         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2719         case_WLAN(MAC_EXISTS_IN_MBSS);
2720         case_WLAN(MESH_CHAN_REGULATORY);
2721         case_WLAN(MESH_CHAN);
2722         default: return "<unknown>";
2723         }
2724 }
2725
2726 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2727                                      struct ieee80211_mgmt *mgmt, size_t len)
2728 {
2729         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2730         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2731
2732         sdata_assert_lock(sdata);
2733
2734         if (len < 24 + 2)
2735                 return;
2736
2737         if (ifmgd->associated &&
2738             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2739                 const u8 *bssid = ifmgd->associated->bssid;
2740
2741                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2742                            bssid, reason_code,
2743                            ieee80211_get_reason_code_string(reason_code));
2744
2745                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2746
2747                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2748                                             reason_code);
2749                 return;
2750         }
2751
2752         if (ifmgd->assoc_data &&
2753             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2754                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2755
2756                 sdata_info(sdata,
2757                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2758                            bssid, reason_code,
2759                            ieee80211_get_reason_code_string(reason_code));
2760
2761                 ieee80211_destroy_assoc_data(sdata, false);
2762
2763                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2764                 return;
2765         }
2766 }
2767
2768
2769 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2770                                        struct ieee80211_mgmt *mgmt, size_t len)
2771 {
2772         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2773         u16 reason_code;
2774
2775         sdata_assert_lock(sdata);
2776
2777         if (len < 24 + 2)
2778                 return;
2779
2780         if (!ifmgd->associated ||
2781             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2782                 return;
2783
2784         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2785
2786         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2787                    mgmt->sa, reason_code);
2788
2789         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2790
2791         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2792 }
2793
2794 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2795                                 u8 *supp_rates, unsigned int supp_rates_len,
2796                                 u32 *rates, u32 *basic_rates,
2797                                 bool *have_higher_than_11mbit,
2798                                 int *min_rate, int *min_rate_index,
2799                                 int shift, u32 rate_flags)
2800 {
2801         int i, j;
2802
2803         for (i = 0; i < supp_rates_len; i++) {
2804                 int rate = supp_rates[i] & 0x7f;
2805                 bool is_basic = !!(supp_rates[i] & 0x80);
2806
2807                 if ((rate * 5 * (1 << shift)) > 110)
2808                         *have_higher_than_11mbit = true;
2809
2810                 /*
2811                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2812                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2813                  *
2814                  * Note: Even through the membership selector and the basic
2815                  *       rate flag share the same bit, they are not exactly
2816                  *       the same.
2817                  */
2818                 if (!!(supp_rates[i] & 0x80) &&
2819                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2820                         continue;
2821
2822                 for (j = 0; j < sband->n_bitrates; j++) {
2823                         struct ieee80211_rate *br;
2824                         int brate;
2825
2826                         br = &sband->bitrates[j];
2827                         if ((rate_flags & br->flags) != rate_flags)
2828                                 continue;
2829
2830                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2831                         if (brate == rate) {
2832                                 *rates |= BIT(j);
2833                                 if (is_basic)
2834                                         *basic_rates |= BIT(j);
2835                                 if ((rate * 5) < *min_rate) {
2836                                         *min_rate = rate * 5;
2837                                         *min_rate_index = j;
2838                                 }
2839                                 break;
2840                         }
2841                 }
2842         }
2843 }
2844
2845 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2846                                     struct cfg80211_bss *cbss,
2847                                     struct ieee80211_mgmt *mgmt, size_t len)
2848 {
2849         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2850         struct ieee80211_local *local = sdata->local;
2851         struct ieee80211_supported_band *sband;
2852         struct sta_info *sta;
2853         u8 *pos;
2854         u16 capab_info, aid;
2855         struct ieee802_11_elems elems;
2856         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2857         const struct cfg80211_bss_ies *bss_ies = NULL;
2858         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2859         u32 changed = 0;
2860         int err;
2861         bool ret;
2862
2863         /* AssocResp and ReassocResp have identical structure */
2864
2865         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2866         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2867
2868         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2869                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2870                            aid);
2871         aid &= ~(BIT(15) | BIT(14));
2872
2873         ifmgd->broken_ap = false;
2874
2875         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2876                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2877                            aid);
2878                 aid = 0;
2879                 ifmgd->broken_ap = true;
2880         }
2881
2882         pos = mgmt->u.assoc_resp.variable;
2883         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2884
2885         if (!elems.supp_rates) {
2886                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2887                 return false;
2888         }
2889
2890         ifmgd->aid = aid;
2891         ifmgd->tdls_chan_switch_prohibited =
2892                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2893                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2894
2895         /*
2896          * Some APs are erroneously not including some information in their
2897          * (re)association response frames. Try to recover by using the data
2898          * from the beacon or probe response. This seems to afflict mobile
2899          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2900          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2901          */
2902         if ((assoc_data->wmm && !elems.wmm_param) ||
2903             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2904              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2905             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2906              (!elems.vht_cap_elem || !elems.vht_operation))) {
2907                 const struct cfg80211_bss_ies *ies;
2908                 struct ieee802_11_elems bss_elems;
2909
2910                 rcu_read_lock();
2911                 ies = rcu_dereference(cbss->ies);
2912                 if (ies)
2913                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2914                                           GFP_ATOMIC);
2915                 rcu_read_unlock();
2916                 if (!bss_ies)
2917                         return false;
2918
2919                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2920                                        false, &bss_elems);
2921                 if (assoc_data->wmm &&
2922                     !elems.wmm_param && bss_elems.wmm_param) {
2923                         elems.wmm_param = bss_elems.wmm_param;
2924                         sdata_info(sdata,
2925                                    "AP bug: WMM param missing from AssocResp\n");
2926                 }
2927
2928                 /*
2929                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2930                  * have to include the IEs in the (re)association response.
2931                  */
2932                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2933                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2934                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2935                         sdata_info(sdata,
2936                                    "AP bug: HT capability missing from AssocResp\n");
2937                 }
2938                 if (!elems.ht_operation && bss_elems.ht_operation &&
2939                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2940                         elems.ht_operation = bss_elems.ht_operation;
2941                         sdata_info(sdata,
2942                                    "AP bug: HT operation missing from AssocResp\n");
2943                 }
2944                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2945                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2946                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2947                         sdata_info(sdata,
2948                                    "AP bug: VHT capa missing from AssocResp\n");
2949                 }
2950                 if (!elems.vht_operation && bss_elems.vht_operation &&
2951                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2952                         elems.vht_operation = bss_elems.vht_operation;
2953                         sdata_info(sdata,
2954                                    "AP bug: VHT operation missing from AssocResp\n");
2955                 }
2956         }
2957
2958         /*
2959          * We previously checked these in the beacon/probe response, so
2960          * they should be present here. This is just a safety net.
2961          */
2962         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2963             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2964                 sdata_info(sdata,
2965                            "HT AP is missing WMM params or HT capability/operation\n");
2966                 ret = false;
2967                 goto out;
2968         }
2969
2970         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2971             (!elems.vht_cap_elem || !elems.vht_operation)) {
2972                 sdata_info(sdata,
2973                            "VHT AP is missing VHT capability/operation\n");
2974                 ret = false;
2975                 goto out;
2976         }
2977
2978         mutex_lock(&sdata->local->sta_mtx);
2979         /*
2980          * station info was already allocated and inserted before
2981          * the association and should be available to us
2982          */
2983         sta = sta_info_get(sdata, cbss->bssid);
2984         if (WARN_ON(!sta)) {
2985                 mutex_unlock(&sdata->local->sta_mtx);
2986                 ret = false;
2987                 goto out;
2988         }
2989
2990         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2991
2992         /* Set up internal HT/VHT capabilities */
2993         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2994                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2995                                                   elems.ht_cap_elem, sta);
2996
2997         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2998                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2999                                                     elems.vht_cap_elem, sta);
3000
3001         /*
3002          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3003          * in their association response, so ignore that data for our own
3004          * configuration. If it changed since the last beacon, we'll get the
3005          * next beacon and update then.
3006          */
3007
3008         /*
3009          * If an operating mode notification IE is present, override the
3010          * NSS calculation (that would be done in rate_control_rate_init())
3011          * and use the # of streams from that element.
3012          */
3013         if (elems.opmode_notif &&
3014             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3015                 u8 nss;
3016
3017                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3018                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3019                 nss += 1;
3020                 sta->sta.rx_nss = nss;
3021         }
3022
3023         rate_control_rate_init(sta);
3024
3025         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3026                 set_sta_flag(sta, WLAN_STA_MFP);
3027                 sta->sta.mfp = true;
3028         } else {
3029                 sta->sta.mfp = false;
3030         }
3031
3032         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3033
3034         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3035         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3036                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3037         if (err) {
3038                 sdata_info(sdata,
3039                            "failed to move station %pM to desired state\n",
3040                            sta->sta.addr);
3041                 WARN_ON(__sta_info_destroy(sta));
3042                 mutex_unlock(&sdata->local->sta_mtx);
3043                 ret = false;
3044                 goto out;
3045         }
3046
3047         mutex_unlock(&sdata->local->sta_mtx);
3048
3049         /*
3050          * Always handle WMM once after association regardless
3051          * of the first value the AP uses. Setting -1 here has
3052          * that effect because the AP values is an unsigned
3053          * 4-bit value.
3054          */
3055         ifmgd->wmm_last_param_set = -1;
3056
3057         if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3058                 ieee80211_set_wmm_default(sdata, false, false);
3059         } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3060                                              elems.wmm_param_len)) {
3061                 /* still enable QoS since we might have HT/VHT */
3062                 ieee80211_set_wmm_default(sdata, false, true);
3063                 /* set the disable-WMM flag in this case to disable
3064                  * tracking WMM parameter changes in the beacon if
3065                  * the parameters weren't actually valid. Doing so
3066                  * avoids changing parameters very strangely when
3067                  * the AP is going back and forth between valid and
3068                  * invalid parameters.
3069                  */
3070                 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3071         }
3072         changed |= BSS_CHANGED_QOS;
3073
3074         /* set AID and assoc capability,
3075          * ieee80211_set_associated() will tell the driver */
3076         bss_conf->aid = aid;
3077         bss_conf->assoc_capability = capab_info;
3078         ieee80211_set_associated(sdata, cbss, changed);
3079
3080         /*
3081          * If we're using 4-addr mode, let the AP know that we're
3082          * doing so, so that it can create the STA VLAN on its side
3083          */
3084         if (ifmgd->use_4addr)
3085                 ieee80211_send_4addr_nullfunc(local, sdata);
3086
3087         /*
3088          * Start timer to probe the connection to the AP now.
3089          * Also start the timer that will detect beacon loss.
3090          */
3091         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3092         ieee80211_sta_reset_beacon_monitor(sdata);
3093
3094         ret = true;
3095  out:
3096         kfree(bss_ies);
3097         return ret;
3098 }
3099
3100 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3101                                          struct ieee80211_mgmt *mgmt,
3102                                          size_t len)
3103 {
3104         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3105         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3106         u16 capab_info, status_code, aid;
3107         struct ieee802_11_elems elems;
3108         int ac, uapsd_queues = -1;
3109         u8 *pos;
3110         bool reassoc;
3111         struct cfg80211_bss *bss;
3112         struct ieee80211_event event = {
3113                 .type = MLME_EVENT,
3114                 .u.mlme.data = ASSOC_EVENT,
3115         };
3116
3117         sdata_assert_lock(sdata);
3118
3119         if (!assoc_data)
3120                 return;
3121         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3122                 return;
3123
3124         /*
3125          * AssocResp and ReassocResp have identical structure, so process both
3126          * of them in this function.
3127          */
3128
3129         if (len < 24 + 6)
3130                 return;
3131
3132         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3133         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3134         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3135         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3136
3137         sdata_info(sdata,
3138                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3139                    reassoc ? "Rea" : "A", mgmt->sa,
3140                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3141
3142         pos = mgmt->u.assoc_resp.variable;
3143         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3144
3145         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3146             elems.timeout_int &&
3147             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3148                 u32 tu, ms;
3149                 tu = le32_to_cpu(elems.timeout_int->value);
3150                 ms = tu * 1024 / 1000;
3151                 sdata_info(sdata,
3152                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3153                            mgmt->sa, tu, ms);
3154                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3155                 assoc_data->timeout_started = true;
3156                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3157                         run_again(sdata, assoc_data->timeout);
3158                 return;
3159         }
3160
3161         bss = assoc_data->bss;
3162
3163         if (status_code != WLAN_STATUS_SUCCESS) {
3164                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3165                            mgmt->sa, status_code);
3166                 ieee80211_destroy_assoc_data(sdata, false);
3167                 event.u.mlme.status = MLME_DENIED;
3168                 event.u.mlme.reason = status_code;
3169                 drv_event_callback(sdata->local, sdata, &event);
3170         } else {
3171                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3172                         /* oops -- internal error -- send timeout for now */
3173                         ieee80211_destroy_assoc_data(sdata, false);
3174                         cfg80211_assoc_timeout(sdata->dev, bss);
3175                         return;
3176                 }
3177                 event.u.mlme.status = MLME_SUCCESS;
3178                 drv_event_callback(sdata->local, sdata, &event);
3179                 sdata_info(sdata, "associated\n");
3180
3181                 /*
3182                  * destroy assoc_data afterwards, as otherwise an idle
3183                  * recalc after assoc_data is NULL but before associated
3184                  * is set can cause the interface to go idle
3185                  */
3186                 ieee80211_destroy_assoc_data(sdata, true);
3187
3188                 /* get uapsd queues configuration */
3189                 uapsd_queues = 0;
3190                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3191                         if (sdata->tx_conf[ac].uapsd)
3192                                 uapsd_queues |= BIT(ac);
3193         }
3194
3195         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3196 }
3197
3198 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3199                                   struct ieee80211_mgmt *mgmt, size_t len,
3200                                   struct ieee80211_rx_status *rx_status,
3201                                   struct ieee802_11_elems *elems)
3202 {
3203         struct ieee80211_local *local = sdata->local;
3204         struct ieee80211_bss *bss;
3205         struct ieee80211_channel *channel;
3206
3207         sdata_assert_lock(sdata);
3208
3209         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3210         if (!channel)
3211                 return;
3212
3213         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3214                                         channel);
3215         if (bss) {
3216                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3217                 ieee80211_rx_bss_put(local, bss);
3218         }
3219 }
3220
3221
3222 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3223                                          struct sk_buff *skb)
3224 {
3225         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3226         struct ieee80211_if_managed *ifmgd;
3227         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3228         size_t baselen, len = skb->len;
3229         struct ieee802_11_elems elems;
3230
3231         ifmgd = &sdata->u.mgd;
3232
3233         sdata_assert_lock(sdata);
3234
3235         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3236                 return; /* ignore ProbeResp to foreign address */
3237
3238         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3239         if (baselen > len)
3240                 return;
3241
3242         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3243                                false, &elems);
3244
3245         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3246
3247         if (ifmgd->associated &&
3248             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3249                 ieee80211_reset_ap_probe(sdata);
3250 }
3251
3252 /*
3253  * This is the canonical list of information elements we care about,
3254  * the filter code also gives us all changes to the Microsoft OUI
3255  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3256  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3257  * changes to requested client power.
3258  *
3259  * We implement beacon filtering in software since that means we can
3260  * avoid processing the frame here and in cfg80211, and userspace
3261  * will not be able to tell whether the hardware supports it or not.
3262  *
3263  * XXX: This list needs to be dynamic -- userspace needs to be able to
3264  *      add items it requires. It also needs to be able to tell us to
3265  *      look out for other vendor IEs.
3266  */
3267 static const u64 care_about_ies =
3268         (1ULL << WLAN_EID_COUNTRY) |
3269         (1ULL << WLAN_EID_ERP_INFO) |
3270         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3271         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3272         (1ULL << WLAN_EID_HT_CAPABILITY) |
3273         (1ULL << WLAN_EID_HT_OPERATION) |
3274         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3275
3276 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3277                                      struct ieee80211_mgmt *mgmt, size_t len,
3278                                      struct ieee80211_rx_status *rx_status)
3279 {
3280         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3281         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3282         size_t baselen;
3283         struct ieee802_11_elems elems;
3284         struct ieee80211_local *local = sdata->local;
3285         struct ieee80211_chanctx_conf *chanctx_conf;
3286         struct ieee80211_channel *chan;
3287         struct sta_info *sta;
3288         u32 changed = 0;
3289         bool erp_valid;
3290         u8 erp_value = 0;
3291         u32 ncrc;
3292         u8 *bssid;
3293         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3294
3295         sdata_assert_lock(sdata);
3296
3297         /* Process beacon from the current BSS */
3298         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3299         if (baselen > len)
3300                 return;
3301
3302         rcu_read_lock();
3303         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3304         if (!chanctx_conf) {
3305                 rcu_read_unlock();
3306                 return;
3307         }
3308
3309         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3310                 rcu_read_unlock();
3311                 return;
3312         }
3313         chan = chanctx_conf->def.chan;
3314         rcu_read_unlock();
3315
3316         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3317             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3318                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3319                                        len - baselen, false, &elems);
3320
3321                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3322                 if (elems.tim && !elems.parse_error) {
3323                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3324                         ifmgd->dtim_period = tim_ie->dtim_period;
3325                 }
3326                 ifmgd->have_beacon = true;
3327                 ifmgd->assoc_data->need_beacon = false;
3328                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3329                         sdata->vif.bss_conf.sync_tsf =
3330                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3331                         sdata->vif.bss_conf.sync_device_ts =
3332                                 rx_status->device_timestamp;
3333                         if (elems.tim)
3334                                 sdata->vif.bss_conf.sync_dtim_count =
3335                                         elems.tim->dtim_count;
3336                         else
3337                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3338                 }
3339                 /* continue assoc process */
3340                 ifmgd->assoc_data->timeout = jiffies;
3341                 ifmgd->assoc_data->timeout_started = true;
3342                 run_again(sdata, ifmgd->assoc_data->timeout);
3343                 return;
3344         }
3345
3346         if (!ifmgd->associated ||
3347             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3348                 return;
3349         bssid = ifmgd->associated->bssid;
3350
3351         /* Track average RSSI from the Beacon frames of the current AP */
3352         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3353                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3354                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3355                 ifmgd->last_cqm_event_signal = 0;
3356                 ifmgd->count_beacon_signal = 1;
3357                 ifmgd->last_ave_beacon_signal = 0;
3358         } else {
3359                 ifmgd->count_beacon_signal++;
3360         }
3361
3362         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3363
3364         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3365             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3366                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3367                 int last_sig = ifmgd->last_ave_beacon_signal;
3368                 struct ieee80211_event event = {
3369                         .type = RSSI_EVENT,
3370                 };
3371
3372                 /*
3373                  * if signal crosses either of the boundaries, invoke callback
3374                  * with appropriate parameters
3375                  */
3376                 if (sig > ifmgd->rssi_max_thold &&
3377                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3378                         ifmgd->last_ave_beacon_signal = sig;
3379                         event.u.rssi.data = RSSI_EVENT_HIGH;
3380                         drv_event_callback(local, sdata, &event);
3381                 } else if (sig < ifmgd->rssi_min_thold &&
3382                            (last_sig >= ifmgd->rssi_max_thold ||
3383                            last_sig == 0)) {
3384                         ifmgd->last_ave_beacon_signal = sig;
3385                         event.u.rssi.data = RSSI_EVENT_LOW;
3386                         drv_event_callback(local, sdata, &event);
3387                 }
3388         }
3389
3390         if (bss_conf->cqm_rssi_thold &&
3391             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3392             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3393                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3394                 int last_event = ifmgd->last_cqm_event_signal;
3395                 int thold = bss_conf->cqm_rssi_thold;
3396                 int hyst = bss_conf->cqm_rssi_hyst;
3397
3398                 if (sig < thold &&
3399                     (last_event == 0 || sig < last_event - hyst)) {
3400                         ifmgd->last_cqm_event_signal = sig;
3401                         ieee80211_cqm_rssi_notify(
3402                                 &sdata->vif,
3403                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3404                                 GFP_KERNEL);
3405                 } else if (sig > thold &&
3406                            (last_event == 0 || sig > last_event + hyst)) {
3407                         ifmgd->last_cqm_event_signal = sig;
3408                         ieee80211_cqm_rssi_notify(
3409                                 &sdata->vif,
3410                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3411                                 GFP_KERNEL);
3412                 }
3413         }
3414
3415         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3416                 mlme_dbg_ratelimited(sdata,
3417                                      "cancelling AP probe due to a received beacon\n");
3418                 ieee80211_reset_ap_probe(sdata);
3419         }
3420
3421         /*
3422          * Push the beacon loss detection into the future since
3423          * we are processing a beacon from the AP just now.
3424          */
3425         ieee80211_sta_reset_beacon_monitor(sdata);
3426
3427         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3428         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3429                                           len - baselen, false, &elems,
3430                                           care_about_ies, ncrc);
3431
3432         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3433             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3434                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3435                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3436                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3437                                 ieee80211_hw_config(local,
3438                                                     IEEE80211_CONF_CHANGE_PS);
3439                         }
3440                         ieee80211_send_nullfunc(local, sdata, false);
3441                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3442                         local->pspolling = true;
3443
3444                         /*
3445                          * Here is assumed that the driver will be
3446                          * able to send ps-poll frame and receive a
3447                          * response even though power save mode is
3448                          * enabled, but some drivers might require
3449                          * to disable power save here. This needs
3450                          * to be investigated.
3451                          */
3452                         ieee80211_send_pspoll(local, sdata);
3453                 }
3454         }
3455
3456         if (sdata->vif.p2p ||
3457             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3458                 struct ieee80211_p2p_noa_attr noa = {};
3459                 int ret;
3460
3461                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3462                                             len - baselen,
3463                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3464                                             (u8 *) &noa, sizeof(noa));
3465                 if (ret >= 2) {
3466                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3467                                 /* valid noa_attr and index changed */
3468                                 sdata->u.mgd.p2p_noa_index = noa.index;
3469                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3470                                 changed |= BSS_CHANGED_P2P_PS;
3471                                 /*
3472                                  * make sure we update all information, the CRC
3473                                  * mechanism doesn't look at P2P attributes.
3474                                  */
3475                                 ifmgd->beacon_crc_valid = false;
3476                         }
3477                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3478                         /* noa_attr not found and we had valid noa_attr before */
3479                         sdata->u.mgd.p2p_noa_index = -1;
3480                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3481                         changed |= BSS_CHANGED_P2P_PS;
3482                         ifmgd->beacon_crc_valid = false;
3483                 }
3484         }
3485
3486         if (ifmgd->csa_waiting_bcn)
3487                 ieee80211_chswitch_post_beacon(sdata);
3488
3489         /*
3490          * Update beacon timing and dtim count on every beacon appearance. This
3491          * will allow the driver to use the most updated values. Do it before
3492          * comparing this one with last received beacon.
3493          * IMPORTANT: These parameters would possibly be out of sync by the time
3494          * the driver will use them. The synchronized view is currently
3495          * guaranteed only in certain callbacks.
3496          */
3497         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3498                 sdata->vif.bss_conf.sync_tsf =
3499                         le64_to_cpu(mgmt->u.beacon.timestamp);
3500                 sdata->vif.bss_conf.sync_device_ts =
3501                         rx_status->device_timestamp;
3502                 if (elems.tim)
3503                         sdata->vif.bss_conf.sync_dtim_count =
3504                                 elems.tim->dtim_count;
3505                 else
3506                         sdata->vif.bss_conf.sync_dtim_count = 0;
3507         }
3508
3509         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3510                 return;
3511         ifmgd->beacon_crc = ncrc;
3512         ifmgd->beacon_crc_valid = true;
3513
3514         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3515
3516         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3517                                          rx_status->device_timestamp,
3518                                          &elems, true);
3519
3520         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3521             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3522                                      elems.wmm_param_len))
3523                 changed |= BSS_CHANGED_QOS;
3524
3525         /*
3526          * If we haven't had a beacon before, tell the driver about the
3527          * DTIM period (and beacon timing if desired) now.
3528          */
3529         if (!ifmgd->have_beacon) {
3530                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3531                 if (elems.tim)
3532                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3533                 else
3534                         bss_conf->dtim_period = 1;
3535
3536                 changed |= BSS_CHANGED_BEACON_INFO;
3537                 ifmgd->have_beacon = true;
3538
3539                 mutex_lock(&local->iflist_mtx);
3540                 ieee80211_recalc_ps(local);
3541                 mutex_unlock(&local->iflist_mtx);
3542
3543                 ieee80211_recalc_ps_vif(sdata);
3544         }
3545
3546         if (elems.erp_info) {
3547                 erp_valid = true;
3548                 erp_value = elems.erp_info[0];
3549         } else {
3550                 erp_valid = false;
3551         }
3552         changed |= ieee80211_handle_bss_capability(sdata,
3553                         le16_to_cpu(mgmt->u.beacon.capab_info),
3554                         erp_valid, erp_value);
3555
3556         mutex_lock(&local->sta_mtx);
3557         sta = sta_info_get(sdata, bssid);
3558
3559         if (ieee80211_config_bw(sdata, sta,
3560                                 elems.ht_cap_elem, elems.ht_operation,
3561                                 elems.vht_operation, bssid, &changed)) {
3562                 mutex_unlock(&local->sta_mtx);
3563                 sdata_info(sdata,
3564                            "failed to follow AP %pM bandwidth change, disconnect\n",
3565                            bssid);
3566                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3567                                        WLAN_REASON_DEAUTH_LEAVING,
3568                                        true, deauth_buf);
3569                 ieee80211_report_disconnect(sdata, deauth_buf,
3570                                             sizeof(deauth_buf), true,
3571                                             WLAN_REASON_DEAUTH_LEAVING);
3572                 return;
3573         }
3574
3575         if (sta && elems.opmode_notif)
3576                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3577                                             rx_status->band);
3578         mutex_unlock(&local->sta_mtx);
3579
3580         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3581                                                elems.country_elem,
3582                                                elems.country_elem_len,
3583                                                elems.pwr_constr_elem,
3584                                                elems.cisco_dtpc_elem);
3585
3586         ieee80211_bss_info_change_notify(sdata, changed);
3587 }
3588
3589 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3590                                   struct sk_buff *skb)
3591 {
3592         struct ieee80211_rx_status *rx_status;
3593         struct ieee80211_mgmt *mgmt;
3594         u16 fc;
3595         struct ieee802_11_elems elems;
3596         int ies_len;
3597
3598         rx_status = (struct ieee80211_rx_status *) skb->cb;
3599         mgmt = (struct ieee80211_mgmt *) skb->data;
3600         fc = le16_to_cpu(mgmt->frame_control);
3601
3602         sdata_lock(sdata);
3603
3604         switch (fc & IEEE80211_FCTL_STYPE) {
3605         case IEEE80211_STYPE_BEACON:
3606                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3607                 break;
3608         case IEEE80211_STYPE_PROBE_RESP:
3609                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3610                 break;
3611         case IEEE80211_STYPE_AUTH:
3612                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3613                 break;
3614         case IEEE80211_STYPE_DEAUTH:
3615                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3616                 break;
3617         case IEEE80211_STYPE_DISASSOC:
3618                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3619                 break;
3620         case IEEE80211_STYPE_ASSOC_RESP:
3621         case IEEE80211_STYPE_REASSOC_RESP:
3622                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3623                 break;
3624         case IEEE80211_STYPE_ACTION:
3625                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3626                         ies_len = skb->len -
3627                                   offsetof(struct ieee80211_mgmt,
3628                                            u.action.u.chan_switch.variable);
3629
3630                         if (ies_len < 0)
3631                                 break;
3632
3633                         ieee802_11_parse_elems(
3634                                 mgmt->u.action.u.chan_switch.variable,
3635                                 ies_len, true, &elems);
3636
3637                         if (elems.parse_error)
3638                                 break;
3639
3640                         ieee80211_sta_process_chanswitch(sdata,
3641                                                  rx_status->mactime,
3642                                                  rx_status->device_timestamp,
3643                                                  &elems, false);
3644                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3645                         ies_len = skb->len -
3646                                   offsetof(struct ieee80211_mgmt,
3647                                            u.action.u.ext_chan_switch.variable);
3648
3649                         if (ies_len < 0)
3650                                 break;
3651
3652                         ieee802_11_parse_elems(
3653                                 mgmt->u.action.u.ext_chan_switch.variable,
3654                                 ies_len, true, &elems);
3655
3656                         if (elems.parse_error)
3657                                 break;
3658
3659                         /* for the handling code pretend this was also an IE */
3660                         elems.ext_chansw_ie =
3661                                 &mgmt->u.action.u.ext_chan_switch.data;
3662
3663                         ieee80211_sta_process_chanswitch(sdata,
3664                                                  rx_status->mactime,
3665                                                  rx_status->device_timestamp,
3666                                                  &elems, false);
3667                 }
3668                 break;
3669         }
3670         sdata_unlock(sdata);
3671 }
3672
3673 static void ieee80211_sta_timer(unsigned long data)
3674 {
3675         struct ieee80211_sub_if_data *sdata =
3676                 (struct ieee80211_sub_if_data *) data;
3677
3678         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3679 }
3680
3681 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3682                                           u8 *bssid, u8 reason, bool tx)
3683 {
3684         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3685
3686         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3687                                tx, frame_buf);
3688
3689         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3690                                     reason);
3691 }
3692
3693 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3694 {
3695         struct ieee80211_local *local = sdata->local;
3696         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3697         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3698         u32 tx_flags = 0;
3699         u16 trans = 1;
3700         u16 status = 0;
3701
3702         sdata_assert_lock(sdata);
3703
3704         if (WARN_ON_ONCE(!auth_data))
3705                 return -EINVAL;
3706
3707         auth_data->tries++;
3708
3709         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3710                 sdata_info(sdata, "authentication with %pM timed out\n",
3711                            auth_data->bss->bssid);
3712
3713                 /*
3714                  * Most likely AP is not in the range so remove the
3715                  * bss struct for that AP.
3716                  */
3717                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3718
3719                 return -ETIMEDOUT;
3720         }
3721
3722         drv_mgd_prepare_tx(local, sdata);
3723
3724         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3725                    auth_data->bss->bssid, auth_data->tries,
3726                    IEEE80211_AUTH_MAX_TRIES);
3727
3728         auth_data->expected_transaction = 2;
3729
3730         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3731                 trans = auth_data->sae_trans;
3732                 status = auth_data->sae_status;
3733                 auth_data->expected_transaction = trans;
3734         }
3735
3736         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3737                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3738                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3739
3740         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3741                             auth_data->data, auth_data->data_len,
3742                             auth_data->bss->bssid,
3743                             auth_data->bss->bssid, NULL, 0, 0,
3744                             tx_flags);
3745
3746         if (tx_flags == 0) {
3747                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3748                 auth_data->timeout_started = true;
3749                 run_again(sdata, auth_data->timeout);
3750         } else {
3751                 auth_data->timeout =
3752                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3753                 auth_data->timeout_started = true;
3754                 run_again(sdata, auth_data->timeout);
3755         }
3756
3757         return 0;
3758 }
3759
3760 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3761 {
3762         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3763         struct ieee80211_local *local = sdata->local;
3764
3765         sdata_assert_lock(sdata);
3766
3767         assoc_data->tries++;
3768         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3769                 sdata_info(sdata, "association with %pM timed out\n",
3770                            assoc_data->bss->bssid);
3771
3772                 /*
3773                  * Most likely AP is not in the range so remove the
3774                  * bss struct for that AP.
3775                  */
3776                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3777
3778                 return -ETIMEDOUT;
3779         }
3780
3781         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3782                    assoc_data->bss->bssid, assoc_data->tries,
3783                    IEEE80211_ASSOC_MAX_TRIES);
3784         ieee80211_send_assoc(sdata);
3785
3786         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3787                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3788                 assoc_data->timeout_started = true;
3789                 run_again(sdata, assoc_data->timeout);
3790         } else {
3791                 assoc_data->timeout =
3792                         round_jiffies_up(jiffies +
3793                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3794                 assoc_data->timeout_started = true;
3795                 run_again(sdata, assoc_data->timeout);
3796         }
3797
3798         return 0;
3799 }
3800
3801 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3802                                   __le16 fc, bool acked)
3803 {
3804         struct ieee80211_local *local = sdata->local;
3805
3806         sdata->u.mgd.status_fc = fc;
3807         sdata->u.mgd.status_acked = acked;
3808         sdata->u.mgd.status_received = true;
3809
3810         ieee80211_queue_work(&local->hw, &sdata->work);
3811 }
3812
3813 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3814 {
3815         struct ieee80211_local *local = sdata->local;
3816         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3817
3818         sdata_lock(sdata);
3819
3820         if (ifmgd->status_received) {
3821                 __le16 fc = ifmgd->status_fc;
3822                 bool status_acked = ifmgd->status_acked;
3823
3824                 ifmgd->status_received = false;
3825                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3826                         if (status_acked) {
3827                                 ifmgd->auth_data->timeout =
3828                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3829                                 run_again(sdata, ifmgd->auth_data->timeout);
3830                         } else {
3831                                 ifmgd->auth_data->timeout = jiffies - 1;
3832                         }
3833                         ifmgd->auth_data->timeout_started = true;
3834                 } else if (ifmgd->assoc_data &&
3835                            (ieee80211_is_assoc_req(fc) ||
3836                             ieee80211_is_reassoc_req(fc))) {
3837                         if (status_acked) {
3838                                 ifmgd->assoc_data->timeout =
3839                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3840                                 run_again(sdata, ifmgd->assoc_data->timeout);
3841                         } else {
3842                                 ifmgd->assoc_data->timeout = jiffies - 1;
3843                         }
3844                         ifmgd->assoc_data->timeout_started = true;
3845                 }
3846         }
3847
3848         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3849             time_after(jiffies, ifmgd->auth_data->timeout)) {
3850                 if (ifmgd->auth_data->done) {
3851                         /*
3852                          * ok ... we waited for assoc but userspace didn't,
3853                          * so let's just kill the auth data
3854                          */
3855                         ieee80211_destroy_auth_data(sdata, false);
3856                 } else if (ieee80211_auth(sdata)) {
3857                         u8 bssid[ETH_ALEN];
3858                         struct ieee80211_event event = {
3859                                 .type = MLME_EVENT,
3860                                 .u.mlme.data = AUTH_EVENT,
3861                                 .u.mlme.status = MLME_TIMEOUT,
3862                         };
3863
3864                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3865
3866                         ieee80211_destroy_auth_data(sdata, false);
3867
3868                         cfg80211_auth_timeout(sdata->dev, bssid);
3869                         drv_event_callback(sdata->local, sdata, &event);
3870                 }
3871         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3872                 run_again(sdata, ifmgd->auth_data->timeout);
3873
3874         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3875             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3876                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3877                     ieee80211_do_assoc(sdata)) {
3878                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3879                         struct ieee80211_event event = {
3880                                 .type = MLME_EVENT,
3881                                 .u.mlme.data = ASSOC_EVENT,
3882                                 .u.mlme.status = MLME_TIMEOUT,
3883                         };
3884
3885                         ieee80211_destroy_assoc_data(sdata, false);
3886                         cfg80211_assoc_timeout(sdata->dev, bss);
3887                         drv_event_callback(sdata->local, sdata, &event);
3888                 }
3889         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3890                 run_again(sdata, ifmgd->assoc_data->timeout);
3891
3892         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3893             ifmgd->associated) {
3894                 u8 bssid[ETH_ALEN];
3895                 int max_tries;
3896
3897                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3898
3899                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3900                         max_tries = max_nullfunc_tries;
3901                 else
3902                         max_tries = max_probe_tries;
3903
3904                 /* ACK received for nullfunc probing frame */
3905                 if (!ifmgd->probe_send_count)
3906                         ieee80211_reset_ap_probe(sdata);
3907                 else if (ifmgd->nullfunc_failed) {
3908                         if (ifmgd->probe_send_count < max_tries) {
3909                                 mlme_dbg(sdata,
3910                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3911                                          bssid, ifmgd->probe_send_count,
3912                                          max_tries);
3913                                 ieee80211_mgd_probe_ap_send(sdata);
3914                         } else {
3915                                 mlme_dbg(sdata,
3916                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3917                                          bssid);
3918                                 ieee80211_sta_connection_lost(sdata, bssid,
3919                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3920                                         false);
3921                         }
3922                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3923                         run_again(sdata, ifmgd->probe_timeout);
3924                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3925                         mlme_dbg(sdata,
3926                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3927                                  bssid, probe_wait_ms);
3928                         ieee80211_sta_connection_lost(sdata, bssid,
3929                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3930                 } else if (ifmgd->probe_send_count < max_tries) {
3931                         mlme_dbg(sdata,
3932                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3933                                  bssid, probe_wait_ms,
3934                                  ifmgd->probe_send_count, max_tries);
3935                         ieee80211_mgd_probe_ap_send(sdata);
3936                 } else {
3937                         /*
3938                          * We actually lost the connection ... or did we?
3939                          * Let's make sure!
3940                          */
3941                         mlme_dbg(sdata,
3942                                  "No probe response from AP %pM after %dms, disconnecting.\n",
3943                                  bssid, probe_wait_ms);
3944
3945                         ieee80211_sta_connection_lost(sdata, bssid,
3946                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3947                 }
3948         }
3949
3950         sdata_unlock(sdata);
3951 }
3952
3953 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3954 {
3955         struct ieee80211_sub_if_data *sdata =
3956                 (struct ieee80211_sub_if_data *) data;
3957         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3958
3959         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3960                 return;
3961
3962         sdata->u.mgd.connection_loss = false;
3963         ieee80211_queue_work(&sdata->local->hw,
3964                              &sdata->u.mgd.beacon_connection_loss_work);
3965 }
3966
3967 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3968 {
3969         struct ieee80211_sub_if_data *sdata =
3970                 (struct ieee80211_sub_if_data *) data;
3971         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3972         struct ieee80211_local *local = sdata->local;
3973
3974         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3975                 return;
3976
3977         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3978 }
3979
3980 static void ieee80211_sta_monitor_work(struct work_struct *work)
3981 {
3982         struct ieee80211_sub_if_data *sdata =
3983                 container_of(work, struct ieee80211_sub_if_data,
3984                              u.mgd.monitor_work);
3985
3986         ieee80211_mgd_probe_ap(sdata, false);
3987 }
3988
3989 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3990 {
3991         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3992                 __ieee80211_stop_poll(sdata);
3993
3994                 /* let's probe the connection once */
3995                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
3996                         ieee80211_queue_work(&sdata->local->hw,
3997                                              &sdata->u.mgd.monitor_work);
3998         }
3999 }
4000
4001 #ifdef CONFIG_PM
4002 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4003 {
4004         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4005         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4006
4007         sdata_lock(sdata);
4008
4009         if (ifmgd->auth_data || ifmgd->assoc_data) {
4010                 const u8 *bssid = ifmgd->auth_data ?
4011                                 ifmgd->auth_data->bss->bssid :
4012                                 ifmgd->assoc_data->bss->bssid;
4013
4014                 /*
4015                  * If we are trying to authenticate / associate while suspending,
4016                  * cfg80211 won't know and won't actually abort those attempts,
4017                  * thus we need to do that ourselves.
4018                  */
4019                 ieee80211_send_deauth_disassoc(sdata, bssid,
4020                                                IEEE80211_STYPE_DEAUTH,
4021                                                WLAN_REASON_DEAUTH_LEAVING,
4022                                                false, frame_buf);
4023                 if (ifmgd->assoc_data)
4024                         ieee80211_destroy_assoc_data(sdata, false);
4025                 if (ifmgd->auth_data)
4026                         ieee80211_destroy_auth_data(sdata, false);
4027                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4028                                       IEEE80211_DEAUTH_FRAME_LEN);
4029         }
4030
4031         /* This is a bit of a hack - we should find a better and more generic
4032          * solution to this. Normally when suspending, cfg80211 will in fact
4033          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4034          * auth (not so important) or assoc (this is the problem) process.
4035          *
4036          * As a consequence, it can happen that we are in the process of both
4037          * associating and suspending, and receive an association response
4038          * after cfg80211 has checked if it needs to disconnect, but before
4039          * we actually set the flag to drop incoming frames. This will then
4040          * cause the workqueue flush to process the association response in
4041          * the suspend, resulting in a successful association just before it
4042          * tries to remove the interface from the driver, which now though
4043          * has a channel context assigned ... this results in issues.
4044          *
4045          * To work around this (for now) simply deauth here again if we're
4046          * now connected.
4047          */
4048         if (ifmgd->associated && !sdata->local->wowlan) {
4049                 u8 bssid[ETH_ALEN];
4050                 struct cfg80211_deauth_request req = {
4051                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4052                         .bssid = bssid,
4053                 };
4054
4055                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4056                 ieee80211_mgd_deauth(sdata, &req);
4057         }
4058
4059         sdata_unlock(sdata);
4060 }
4061
4062 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4063 {
4064         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4065
4066         sdata_lock(sdata);
4067         if (!ifmgd->associated) {
4068                 sdata_unlock(sdata);
4069                 return;
4070         }
4071
4072         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4073                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4074                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4075                 ieee80211_sta_connection_lost(sdata,
4076                                               ifmgd->associated->bssid,
4077                                               WLAN_REASON_UNSPECIFIED,
4078                                               true);
4079                 sdata_unlock(sdata);
4080                 return;
4081         }
4082         sdata_unlock(sdata);
4083 }
4084 #endif
4085
4086 /* interface setup */
4087 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4088 {
4089         struct ieee80211_if_managed *ifmgd;
4090
4091         ifmgd = &sdata->u.mgd;
4092         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4093         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4094         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4095                   ieee80211_beacon_connection_loss_work);
4096         INIT_WORK(&ifmgd->csa_connection_drop_work,
4097                   ieee80211_csa_connection_drop_work);
4098         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4099         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4100                           ieee80211_tdls_peer_del_work);
4101         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4102                     (unsigned long) sdata);
4103         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4104                     (unsigned long) sdata);
4105         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4106                     (unsigned long) sdata);
4107         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4108                     (unsigned long) sdata);
4109         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4110                           ieee80211_sta_handle_tspec_ac_params_wk);
4111
4112         ifmgd->flags = 0;
4113         ifmgd->powersave = sdata->wdev.ps;
4114         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4115         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4116         ifmgd->p2p_noa_index = -1;
4117
4118         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4119                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4120         else
4121                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4122
4123         /* Setup TDLS data */
4124         spin_lock_init(&ifmgd->teardown_lock);
4125         ifmgd->teardown_skb = NULL;
4126         ifmgd->orig_teardown_skb = NULL;
4127 }
4128
4129 /* scan finished notification */
4130 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4131 {
4132         struct ieee80211_sub_if_data *sdata;
4133
4134         /* Restart STA timers */
4135         rcu_read_lock();
4136         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4137                 if (ieee80211_sdata_running(sdata))
4138                         ieee80211_restart_sta_timer(sdata);
4139         }
4140         rcu_read_unlock();
4141 }
4142
4143 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4144                                      struct cfg80211_bss *cbss)
4145 {
4146         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4147         const u8 *ht_cap_ie, *vht_cap_ie;
4148         const struct ieee80211_ht_cap *ht_cap;
4149         const struct ieee80211_vht_cap *vht_cap;
4150         u8 chains = 1;
4151
4152         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4153                 return chains;
4154
4155         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4156         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4157                 ht_cap = (void *)(ht_cap_ie + 2);
4158                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4159                 /*
4160                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4161                  *       "Tx Unequal Modulation Supported" fields.
4162                  */
4163         }
4164
4165         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4166                 return chains;
4167
4168         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4169         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4170                 u8 nss;
4171                 u16 tx_mcs_map;
4172
4173                 vht_cap = (void *)(vht_cap_ie + 2);
4174                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4175                 for (nss = 8; nss > 0; nss--) {
4176                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4177                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4178                                 break;
4179                 }
4180                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4181                 chains = max(chains, nss);
4182         }
4183
4184         return chains;
4185 }
4186
4187 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4188                                   struct cfg80211_bss *cbss)
4189 {
4190         struct ieee80211_local *local = sdata->local;
4191         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4192         const struct ieee80211_ht_cap *ht_cap = NULL;
4193         const struct ieee80211_ht_operation *ht_oper = NULL;
4194         const struct ieee80211_vht_operation *vht_oper = NULL;
4195         struct ieee80211_supported_band *sband;
4196         struct cfg80211_chan_def chandef;
4197         int ret;
4198         u32 i;
4199         bool have_80mhz;
4200
4201         sband = local->hw.wiphy->bands[cbss->channel->band];
4202
4203         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4204                           IEEE80211_STA_DISABLE_80P80MHZ |
4205                           IEEE80211_STA_DISABLE_160MHZ);
4206
4207         rcu_read_lock();
4208
4209         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4210             sband->ht_cap.ht_supported) {
4211                 const u8 *ht_oper_ie, *ht_cap_ie;
4212
4213                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4214                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4215                         ht_oper = (void *)(ht_oper_ie + 2);
4216
4217                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4218                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4219                         ht_cap = (void *)(ht_cap_ie + 2);
4220
4221                 if (!ht_cap) {
4222                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4223                         ht_oper = NULL;
4224                 }
4225         }
4226
4227         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4228             sband->vht_cap.vht_supported) {
4229                 const u8 *vht_oper_ie, *vht_cap;
4230
4231                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4232                                                    WLAN_EID_VHT_OPERATION);
4233                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4234                         vht_oper = (void *)(vht_oper_ie + 2);
4235                 if (vht_oper && !ht_oper) {
4236                         vht_oper = NULL;
4237                         sdata_info(sdata,
4238                                    "AP advertised VHT without HT, disabling both\n");
4239                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4240                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4241                 }
4242
4243                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4244                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4245                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4246                         vht_oper = NULL;
4247                 }
4248         }
4249
4250         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4251         have_80mhz = false;
4252         for (i = 0; i < sband->n_channels; i++) {
4253                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4254                                                 IEEE80211_CHAN_NO_80MHZ))
4255                         continue;
4256
4257                 have_80mhz = true;
4258                 break;
4259         }
4260
4261         if (!have_80mhz)
4262                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4263
4264         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4265                                                      cbss->channel,
4266                                                      ht_cap, ht_oper, vht_oper,
4267                                                      &chandef, false);
4268
4269         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4270                                       local->rx_chains);
4271
4272         rcu_read_unlock();
4273
4274         /* will change later if needed */
4275         sdata->smps_mode = IEEE80211_SMPS_OFF;
4276
4277         mutex_lock(&local->mtx);
4278         /*
4279          * If this fails (possibly due to channel context sharing
4280          * on incompatible channels, e.g. 80+80 and 160 sharing the
4281          * same control channel) try to use a smaller bandwidth.
4282          */
4283         ret = ieee80211_vif_use_channel(sdata, &chandef,
4284                                         IEEE80211_CHANCTX_SHARED);
4285
4286         /* don't downgrade for 5 and 10 MHz channels, though. */
4287         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4288             chandef.width == NL80211_CHAN_WIDTH_10)
4289                 goto out;
4290
4291         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4292                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4293                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4294                                                 IEEE80211_CHANCTX_SHARED);
4295         }
4296  out:
4297         mutex_unlock(&local->mtx);
4298         return ret;
4299 }
4300
4301 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4302                                      struct cfg80211_bss *cbss, bool assoc,
4303                                      bool override)
4304 {
4305         struct ieee80211_local *local = sdata->local;
4306         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4307         struct ieee80211_bss *bss = (void *)cbss->priv;
4308         struct sta_info *new_sta = NULL;
4309         struct ieee80211_supported_band *sband;
4310         bool have_sta = false;
4311         int err;
4312
4313         sband = local->hw.wiphy->bands[cbss->channel->band];
4314
4315         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4316                 return -EINVAL;
4317
4318         if (assoc) {
4319                 rcu_read_lock();
4320                 have_sta = sta_info_get(sdata, cbss->bssid);
4321                 rcu_read_unlock();
4322         }
4323
4324         if (!have_sta) {
4325                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4326                 if (!new_sta)
4327                         return -ENOMEM;
4328         }
4329
4330         if (new_sta || override) {
4331                 err = ieee80211_prep_channel(sdata, cbss);
4332                 if (err) {
4333                         if (new_sta)
4334                                 sta_info_free(local, new_sta);
4335                         return -EINVAL;
4336                 }
4337         }
4338
4339         if (new_sta) {
4340                 u32 rates = 0, basic_rates = 0;
4341                 bool have_higher_than_11mbit;
4342                 int min_rate = INT_MAX, min_rate_index = -1;
4343                 struct ieee80211_chanctx_conf *chanctx_conf;
4344                 const struct cfg80211_bss_ies *ies;
4345                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4346                 u32 rate_flags;
4347
4348                 rcu_read_lock();
4349                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4350                 if (WARN_ON(!chanctx_conf)) {
4351                         rcu_read_unlock();
4352                         sta_info_free(local, new_sta);
4353                         return -EINVAL;
4354                 }
4355                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4356                 rcu_read_unlock();
4357
4358                 ieee80211_get_rates(sband, bss->supp_rates,
4359                                     bss->supp_rates_len,
4360                                     &rates, &basic_rates,
4361                                     &have_higher_than_11mbit,
4362                                     &min_rate, &min_rate_index,
4363                                     shift, rate_flags);
4364
4365                 /*
4366                  * This used to be a workaround for basic rates missing
4367                  * in the association response frame. Now that we no
4368                  * longer use the basic rates from there, it probably
4369                  * doesn't happen any more, but keep the workaround so
4370                  * in case some *other* APs are buggy in different ways
4371                  * we can connect -- with a warning.
4372                  */
4373                 if (!basic_rates && min_rate_index >= 0) {
4374                         sdata_info(sdata,
4375                                    "No basic rates, using min rate instead\n");
4376                         basic_rates = BIT(min_rate_index);
4377                 }
4378
4379                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4380                 sdata->vif.bss_conf.basic_rates = basic_rates;
4381
4382                 /* cf. IEEE 802.11 9.2.12 */
4383                 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4384                     have_higher_than_11mbit)
4385                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4386                 else
4387                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4388
4389                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4390
4391                 /* set timing information */
4392                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4393                 rcu_read_lock();
4394                 ies = rcu_dereference(cbss->beacon_ies);
4395                 if (ies) {
4396                         const u8 *tim_ie;
4397
4398                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4399                         sdata->vif.bss_conf.sync_device_ts =
4400                                 bss->device_ts_beacon;
4401                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4402                                                   ies->data, ies->len);
4403                         if (tim_ie && tim_ie[1] >= 2)
4404                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4405                         else
4406                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4407                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4408                                                TIMING_BEACON_ONLY)) {
4409                         ies = rcu_dereference(cbss->proberesp_ies);
4410                         /* must be non-NULL since beacon IEs were NULL */
4411                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4412                         sdata->vif.bss_conf.sync_device_ts =
4413                                 bss->device_ts_presp;
4414                         sdata->vif.bss_conf.sync_dtim_count = 0;
4415                 } else {
4416                         sdata->vif.bss_conf.sync_tsf = 0;
4417                         sdata->vif.bss_conf.sync_device_ts = 0;
4418                         sdata->vif.bss_conf.sync_dtim_count = 0;
4419                 }
4420                 rcu_read_unlock();
4421
4422                 /* tell driver about BSSID, basic rates and timing */
4423                 ieee80211_bss_info_change_notify(sdata,
4424                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4425                         BSS_CHANGED_BEACON_INT);
4426
4427                 if (assoc)
4428                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4429
4430                 err = sta_info_insert(new_sta);
4431                 new_sta = NULL;
4432                 if (err) {
4433                         sdata_info(sdata,
4434                                    "failed to insert STA entry for the AP (error %d)\n",
4435                                    err);
4436                         return err;
4437                 }
4438         } else
4439                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4440
4441         /* Cancel scan to ensure that nothing interferes with connection */
4442         if (local->scanning)
4443                 ieee80211_scan_cancel(local);
4444
4445         return 0;
4446 }
4447
4448 /* config hooks */
4449 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4450                        struct cfg80211_auth_request *req)
4451 {
4452         struct ieee80211_local *local = sdata->local;
4453         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4454         struct ieee80211_mgd_auth_data *auth_data;
4455         u16 auth_alg;
4456         int err;
4457
4458         /* prepare auth data structure */
4459
4460         switch (req->auth_type) {
4461         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4462                 auth_alg = WLAN_AUTH_OPEN;
4463                 break;
4464         case NL80211_AUTHTYPE_SHARED_KEY:
4465                 if (IS_ERR(local->wep_tx_tfm))
4466                         return -EOPNOTSUPP;
4467                 auth_alg = WLAN_AUTH_SHARED_KEY;
4468                 break;
4469         case NL80211_AUTHTYPE_FT:
4470                 auth_alg = WLAN_AUTH_FT;
4471                 break;
4472         case NL80211_AUTHTYPE_NETWORK_EAP:
4473                 auth_alg = WLAN_AUTH_LEAP;
4474                 break;
4475         case NL80211_AUTHTYPE_SAE:
4476                 auth_alg = WLAN_AUTH_SAE;
4477                 break;
4478         default:
4479                 return -EOPNOTSUPP;
4480         }
4481
4482         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4483                             req->ie_len, GFP_KERNEL);
4484         if (!auth_data)
4485                 return -ENOMEM;
4486
4487         auth_data->bss = req->bss;
4488
4489         if (req->sae_data_len >= 4) {
4490                 __le16 *pos = (__le16 *) req->sae_data;
4491                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4492                 auth_data->sae_status = le16_to_cpu(pos[1]);
4493                 memcpy(auth_data->data, req->sae_data + 4,
4494                        req->sae_data_len - 4);
4495                 auth_data->data_len += req->sae_data_len - 4;
4496         }
4497
4498         if (req->ie && req->ie_len) {
4499                 memcpy(&auth_data->data[auth_data->data_len],
4500                        req->ie, req->ie_len);
4501                 auth_data->data_len += req->ie_len;
4502         }
4503
4504         if (req->key && req->key_len) {
4505                 auth_data->key_len = req->key_len;
4506                 auth_data->key_idx = req->key_idx;
4507                 memcpy(auth_data->key, req->key, req->key_len);
4508         }
4509
4510         auth_data->algorithm = auth_alg;
4511
4512         /* try to authenticate/probe */
4513
4514         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4515             ifmgd->assoc_data) {
4516                 err = -EBUSY;
4517                 goto err_free;
4518         }
4519
4520         if (ifmgd->auth_data)
4521                 ieee80211_destroy_auth_data(sdata, false);
4522
4523         /* prep auth_data so we don't go into idle on disassoc */
4524         ifmgd->auth_data = auth_data;
4525
4526         if (ifmgd->associated) {
4527                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4528
4529                 sdata_info(sdata,
4530                            "disconnect from AP %pM for new auth to %pM\n",
4531                            ifmgd->associated->bssid, req->bss->bssid);
4532                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4533                                        WLAN_REASON_UNSPECIFIED,
4534                                        false, frame_buf);
4535
4536                 ieee80211_report_disconnect(sdata, frame_buf,
4537                                             sizeof(frame_buf), true,
4538                                             WLAN_REASON_UNSPECIFIED);
4539         }
4540
4541         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4542
4543         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4544         if (err)
4545                 goto err_clear;
4546
4547         err = ieee80211_auth(sdata);
4548         if (err) {
4549                 sta_info_destroy_addr(sdata, req->bss->bssid);
4550                 goto err_clear;
4551         }
4552
4553         /* hold our own reference */
4554         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4555         return 0;
4556
4557  err_clear:
4558         eth_zero_addr(ifmgd->bssid);
4559         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4560         ifmgd->auth_data = NULL;
4561         mutex_lock(&sdata->local->mtx);
4562         ieee80211_vif_release_channel(sdata);
4563         mutex_unlock(&sdata->local->mtx);
4564  err_free:
4565         kfree(auth_data);
4566         return err;
4567 }
4568
4569 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4570                         struct cfg80211_assoc_request *req)
4571 {
4572         struct ieee80211_local *local = sdata->local;
4573         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4574         struct ieee80211_bss *bss = (void *)req->bss->priv;
4575         struct ieee80211_mgd_assoc_data *assoc_data;
4576         const struct cfg80211_bss_ies *beacon_ies;
4577         struct ieee80211_supported_band *sband;
4578         const u8 *ssidie, *ht_ie, *vht_ie;
4579         int i, err;
4580         bool override = false;
4581
4582         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4583         if (!assoc_data)
4584                 return -ENOMEM;
4585
4586         rcu_read_lock();
4587         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4588         if (!ssidie) {
4589                 rcu_read_unlock();
4590                 kfree(assoc_data);
4591                 return -EINVAL;
4592         }
4593         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4594         assoc_data->ssid_len = ssidie[1];
4595         rcu_read_unlock();
4596
4597         if (ifmgd->associated) {
4598                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4599
4600                 sdata_info(sdata,
4601                            "disconnect from AP %pM for new assoc to %pM\n",
4602                            ifmgd->associated->bssid, req->bss->bssid);
4603                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4604                                        WLAN_REASON_UNSPECIFIED,
4605                                        false, frame_buf);
4606
4607                 ieee80211_report_disconnect(sdata, frame_buf,
4608                                             sizeof(frame_buf), true,
4609                                             WLAN_REASON_UNSPECIFIED);
4610         }
4611
4612         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4613                 err = -EBUSY;
4614                 goto err_free;
4615         }
4616
4617         if (ifmgd->assoc_data) {
4618                 err = -EBUSY;
4619                 goto err_free;
4620         }
4621
4622         if (ifmgd->auth_data) {
4623                 bool match;
4624
4625                 /* keep sta info, bssid if matching */
4626                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4627                 ieee80211_destroy_auth_data(sdata, match);
4628         }
4629
4630         /* prepare assoc data */
4631
4632         ifmgd->beacon_crc_valid = false;
4633
4634         assoc_data->wmm = bss->wmm_used &&
4635                           (local->hw.queues >= IEEE80211_NUM_ACS);
4636
4637         /*
4638          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4639          * We still associate in non-HT mode (11a/b/g) if any one of these
4640          * ciphers is configured as pairwise.
4641          * We can set this to true for non-11n hardware, that'll be checked
4642          * separately along with the peer capabilities.
4643          */
4644         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4645                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4646                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4647                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4648                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4649                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4650                         netdev_info(sdata->dev,
4651                                     "disabling HT/VHT due to WEP/TKIP use\n");
4652                 }
4653         }
4654
4655         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4656         sband = local->hw.wiphy->bands[req->bss->channel->band];
4657         if (!sband->ht_cap.ht_supported ||
4658             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4659             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4660                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4661                 if (!bss->wmm_used &&
4662                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4663                         netdev_info(sdata->dev,
4664                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4665         }
4666
4667         /* disable VHT if we don't support it or the AP doesn't use WMM */
4668         if (!sband->vht_cap.vht_supported ||
4669             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4670             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4671                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4672                 if (!bss->wmm_used &&
4673                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4674                         netdev_info(sdata->dev,
4675                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4676         }
4677
4678         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4679         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4680                sizeof(ifmgd->ht_capa_mask));
4681
4682         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4683         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4684                sizeof(ifmgd->vht_capa_mask));
4685
4686         if (req->ie && req->ie_len) {
4687                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4688                 assoc_data->ie_len = req->ie_len;
4689         }
4690
4691         assoc_data->bss = req->bss;
4692
4693         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4694                 if (ifmgd->powersave)
4695                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4696                 else
4697                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4698         } else
4699                 sdata->smps_mode = ifmgd->req_smps;
4700
4701         assoc_data->capability = req->bss->capability;
4702         assoc_data->supp_rates = bss->supp_rates;
4703         assoc_data->supp_rates_len = bss->supp_rates_len;
4704
4705         rcu_read_lock();
4706         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4707         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4708                 assoc_data->ap_ht_param =
4709                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4710         else
4711                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4712         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4713         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4714                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4715                        sizeof(struct ieee80211_vht_cap));
4716         else
4717                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4718         rcu_read_unlock();
4719
4720         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4721                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4722              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4723                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4724
4725         if (bss->wmm_used && bss->uapsd_supported &&
4726             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4727                 assoc_data->uapsd = true;
4728                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4729         } else {
4730                 assoc_data->uapsd = false;
4731                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4732         }
4733
4734         if (req->prev_bssid)
4735                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4736
4737         if (req->use_mfp) {
4738                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4739                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4740         } else {
4741                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4742                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4743         }
4744
4745         if (req->flags & ASSOC_REQ_USE_RRM)
4746                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4747         else
4748                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4749
4750         if (req->crypto.control_port)
4751                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4752         else
4753                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4754
4755         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4756         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4757         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4758                                                         sdata->vif.type);
4759
4760         /* kick off associate process */
4761
4762         ifmgd->assoc_data = assoc_data;
4763         ifmgd->dtim_period = 0;
4764         ifmgd->have_beacon = false;
4765
4766         /* override HT/VHT configuration only if the AP and we support it */
4767         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4768                 struct ieee80211_sta_ht_cap sta_ht_cap;
4769
4770                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4771                         override = true;
4772
4773                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4774                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4775
4776                 /* check for 40 MHz disable override */
4777                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4778                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4779                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4780                         override = true;
4781
4782                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4783                     req->flags & ASSOC_REQ_DISABLE_VHT)
4784                         override = true;
4785         }
4786
4787         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4788                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4789                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4790         }
4791
4792         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4793                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4794
4795         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4796         if (err)
4797                 goto err_clear;
4798
4799         rcu_read_lock();
4800         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4801
4802         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4803             !beacon_ies) {
4804                 /*
4805                  * Wait up to one beacon interval ...
4806                  * should this be more if we miss one?
4807                  */
4808                 sdata_info(sdata, "waiting for beacon from %pM\n",
4809                            ifmgd->bssid);
4810                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4811                 assoc_data->timeout_started = true;
4812                 assoc_data->need_beacon = true;
4813         } else if (beacon_ies) {
4814                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4815                                                     beacon_ies->data,
4816                                                     beacon_ies->len);
4817                 u8 dtim_count = 0;
4818
4819                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4820                         const struct ieee80211_tim_ie *tim;
4821                         tim = (void *)(tim_ie + 2);
4822                         ifmgd->dtim_period = tim->dtim_period;
4823                         dtim_count = tim->dtim_count;
4824                 }
4825                 ifmgd->have_beacon = true;
4826                 assoc_data->timeout = jiffies;
4827                 assoc_data->timeout_started = true;
4828
4829                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4830                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4831                         sdata->vif.bss_conf.sync_device_ts =
4832                                 bss->device_ts_beacon;
4833                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4834                 }
4835         } else {
4836                 assoc_data->timeout = jiffies;
4837                 assoc_data->timeout_started = true;
4838         }
4839         rcu_read_unlock();
4840
4841         run_again(sdata, assoc_data->timeout);
4842
4843         if (bss->corrupt_data) {
4844                 char *corrupt_type = "data";
4845                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4846                         if (bss->corrupt_data &
4847                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4848                                 corrupt_type = "beacon and probe response";
4849                         else
4850                                 corrupt_type = "beacon";
4851                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4852                         corrupt_type = "probe response";
4853                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4854                            corrupt_type);
4855         }
4856
4857         return 0;
4858  err_clear:
4859         eth_zero_addr(ifmgd->bssid);
4860         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4861         ifmgd->assoc_data = NULL;
4862  err_free:
4863         kfree(assoc_data);
4864         return err;
4865 }
4866
4867 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4868                          struct cfg80211_deauth_request *req)
4869 {
4870         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4871         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4872         bool tx = !req->local_state_change;
4873
4874         if (ifmgd->auth_data &&
4875             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4876                 sdata_info(sdata,
4877                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4878                            req->bssid, req->reason_code,
4879                            ieee80211_get_reason_code_string(req->reason_code));
4880
4881                 drv_mgd_prepare_tx(sdata->local, sdata);
4882                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4883                                                IEEE80211_STYPE_DEAUTH,
4884                                                req->reason_code, tx,
4885                                                frame_buf);
4886                 ieee80211_destroy_auth_data(sdata, false);
4887                 ieee80211_report_disconnect(sdata, frame_buf,
4888                                             sizeof(frame_buf), true,
4889                                             req->reason_code);
4890
4891                 return 0;
4892         }
4893
4894         if (ifmgd->assoc_data &&
4895             ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4896                 sdata_info(sdata,
4897                            "aborting association with %pM by local choice (Reason: %u=%s)\n",
4898                            req->bssid, req->reason_code,
4899                            ieee80211_get_reason_code_string(req->reason_code));
4900
4901                 drv_mgd_prepare_tx(sdata->local, sdata);
4902                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4903                                                IEEE80211_STYPE_DEAUTH,
4904                                                req->reason_code, tx,
4905                                                frame_buf);
4906                 ieee80211_destroy_assoc_data(sdata, false);
4907                 ieee80211_report_disconnect(sdata, frame_buf,
4908                                             sizeof(frame_buf), true,
4909                                             req->reason_code);
4910                 return 0;
4911         }
4912
4913         if (ifmgd->associated &&
4914             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4915                 sdata_info(sdata,
4916                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4917                            req->bssid, req->reason_code,
4918                            ieee80211_get_reason_code_string(req->reason_code));
4919
4920                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4921                                        req->reason_code, tx, frame_buf);
4922                 ieee80211_report_disconnect(sdata, frame_buf,
4923                                             sizeof(frame_buf), true,
4924                                             req->reason_code);
4925                 return 0;
4926         }
4927
4928         return -ENOTCONN;
4929 }
4930
4931 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4932                            struct cfg80211_disassoc_request *req)
4933 {
4934         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4935         u8 bssid[ETH_ALEN];
4936         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4937
4938         /*
4939          * cfg80211 should catch this ... but it's racy since
4940          * we can receive a disassoc frame, process it, hand it
4941          * to cfg80211 while that's in a locked section already
4942          * trying to tell us that the user wants to disconnect.
4943          */
4944         if (ifmgd->associated != req->bss)
4945                 return -ENOLINK;
4946
4947         sdata_info(sdata,
4948                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4949                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4950
4951         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4952         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4953                                req->reason_code, !req->local_state_change,
4954                                frame_buf);
4955
4956         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
4957                                     req->reason_code);
4958
4959         return 0;
4960 }
4961
4962 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4963 {
4964         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4965
4966         /*
4967          * Make sure some work items will not run after this,
4968          * they will not do anything but might not have been
4969          * cancelled when disconnecting.
4970          */
4971         cancel_work_sync(&ifmgd->monitor_work);
4972         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4973         cancel_work_sync(&ifmgd->request_smps_work);
4974         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4975         cancel_work_sync(&ifmgd->chswitch_work);
4976         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4977
4978         sdata_lock(sdata);
4979         if (ifmgd->assoc_data) {
4980                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4981                 ieee80211_destroy_assoc_data(sdata, false);
4982                 cfg80211_assoc_timeout(sdata->dev, bss);
4983         }
4984         if (ifmgd->auth_data)
4985                 ieee80211_destroy_auth_data(sdata, false);
4986         spin_lock_bh(&ifmgd->teardown_lock);
4987         if (ifmgd->teardown_skb) {
4988                 kfree_skb(ifmgd->teardown_skb);
4989                 ifmgd->teardown_skb = NULL;
4990                 ifmgd->orig_teardown_skb = NULL;
4991         }
4992         spin_unlock_bh(&ifmgd->teardown_lock);
4993         del_timer_sync(&ifmgd->timer);
4994         sdata_unlock(sdata);
4995 }
4996
4997 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4998                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4999                                gfp_t gfp)
5000 {
5001         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5002
5003         trace_api_cqm_rssi_notify(sdata, rssi_event);
5004
5005         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5006 }
5007 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5008
5009 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5010 {
5011         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5012
5013         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5014
5015         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5016 }
5017 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);