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 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(!sdata->u.mgd.associated))
 126                 return;
 127
 128         ifmgd->probe_send_count = 0;
 129
 130         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 131                 return;
 132
 133         mod_timer(&sdata->u.mgd.conn_mon_timer,
 134                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 135 }
 136
 137 static int ecw2cw(int ecw)
 138 {
 139         return (1 << ecw) - 1;
 140 }
 141
 142 static u32
 143 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 144                              struct ieee80211_supported_band *sband,
 145                              struct ieee80211_channel *channel,
 146                              const struct ieee80211_ht_cap *ht_cap,
 147                              const struct ieee80211_ht_operation *ht_oper,
 148                              const struct ieee80211_vht_operation *vht_oper,
 149                              struct cfg80211_chan_def *chandef, bool tracking)
 150 {
 151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 152         struct cfg80211_chan_def vht_chandef;
 153         struct ieee80211_sta_ht_cap sta_ht_cap;
 154         u32 ht_cfreq, ret;
 155
 156         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 157         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 158
 159         chandef->chan = channel;
 160         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 161         chandef->center_freq1 = channel->center_freq;
 162         chandef->center_freq2 = 0;
 163
 164         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 165                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 166                 goto out;
 167         }
 168
 169         chandef->width = NL80211_CHAN_WIDTH_20;
 170
 171         if (!(ht_cap->cap_info &
 172               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 173                 ret = IEEE80211_STA_DISABLE_40MHZ;
 174                 vht_chandef = *chandef;
 175                 goto out;
 176         }
 177
 178         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 179                                                   channel->band);
 180         /* check that channel matches the right operating channel */
 181         if (!tracking && channel->center_freq != ht_cfreq) {
 182                 /*
 183                  * It's possible that some APs are confused here;
 184                  * Netgear WNDR3700 sometimes reports 4 higher than
 185                  * the actual channel in association responses, but
 186                  * since we look at probe response/beacon data here
 187                  * it should be OK.
 188                  */
 189                 sdata_info(sdata,
 190                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 191                            channel->center_freq, ht_cfreq,
 192                            ht_oper->primary_chan, channel->band);
 193                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 194                 goto out;
 195         }
 196
 197         /* check 40 MHz support, if we have it */
 198         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 199                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 200                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 201                         chandef->width = NL80211_CHAN_WIDTH_40;
 202                         chandef->center_freq1 += 10;
 203                         break;
 204                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 205                         chandef->width = NL80211_CHAN_WIDTH_40;
 206                         chandef->center_freq1 -= 10;
 207                         break;
 208                 }
 209         } else {
 210                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 211                 ret = IEEE80211_STA_DISABLE_VHT;
 212                 /* also mark 40 MHz disabled */
 213                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 214                 goto out;
 215         }
 216
 217         if (!vht_oper || !sband->vht_cap.vht_supported) {
 218                 ret = IEEE80211_STA_DISABLE_VHT;
 219                 goto out;
 220         }
 221
 222         vht_chandef.chan = channel;
 223         vht_chandef.center_freq1 =
 224                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 225                                                channel->band);
 226         vht_chandef.center_freq2 = 0;
 227
 228         switch (vht_oper->chan_width) {
 229         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 230                 vht_chandef.width = chandef->width;
 231                 vht_chandef.center_freq1 = chandef->center_freq1;
 232                 break;
 233         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 234                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 235                 break;
 236         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 237                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 238                 break;
 239         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 240                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 241                 vht_chandef.center_freq2 =
 242                         ieee80211_channel_to_frequency(
 243                                 vht_oper->center_freq_seg2_idx,
 244                                 channel->band);
 245                 break;
 246         default:
 247                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 248                         sdata_info(sdata,
 249                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 250                                    vht_oper->chan_width);
 251                 ret = IEEE80211_STA_DISABLE_VHT;
 252                 goto out;
 253         }
 254
 255         if (!cfg80211_chandef_valid(&vht_chandef)) {
 256                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 257                         sdata_info(sdata,
 258                                    "AP VHT information is invalid, disable VHT\n");
 259                 ret = IEEE80211_STA_DISABLE_VHT;
 260                 goto out;
 261         }
 262
 263         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 264                 ret = 0;
 265                 goto out;
 266         }
 267
 268         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 269                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 270                         sdata_info(sdata,
 271                                    "AP VHT information doesn't match HT, disable VHT\n");
 272                 ret = IEEE80211_STA_DISABLE_VHT;
 273                 goto out;
 274         }
 275
 276         *chandef = vht_chandef;
 277
 278         ret = 0;
 279
 280 out:
 281         /*
 282          * When tracking the current AP, don't do any further checks if the
 283          * new chandef is identical to the one we're currently using for the
 284          * connection. This keeps us from playing ping-pong with regulatory,
 285          * without it the following can happen (for example):
 286          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 287          *  - AP advertises regdom US
 288          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 289          *  - the code below detects an unsupported channel, downgrades, and
 290          *    we disconnect from the AP in the caller
 291          *  - disconnect causes CRDA to reload world regdomain and the game
 292          *    starts anew.
 293          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 294          *
 295          * It seems possible that there are still scenarios with CSA or real
 296          * bandwidth changes where a this could happen, but those cases are
 297          * less common and wouldn't completely prevent using the AP.
 298          */
 299         if (tracking &&
 300             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 301                 return ret;
 302
 303         /* don't print the message below for VHT mismatch if VHT is disabled */
 304         if (ret & IEEE80211_STA_DISABLE_VHT)
 305                 vht_chandef = *chandef;
 306
 307         /*
 308          * Ignore the DISABLED flag when we're already connected and only
 309          * tracking the APs beacon for bandwidth changes - otherwise we
 310          * might get disconnected here if we connect to an AP, update our
 311          * regulatory information based on the AP's country IE and the
 312          * information we have is wrong/outdated and disables the channel
 313          * that we're actually using for the connection to the AP.
 314          */
 315         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 316                                         tracking ? 0 :
 317                                                    IEEE80211_CHAN_DISABLED)) {
 318                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 319                         ret = IEEE80211_STA_DISABLE_HT |
 320                               IEEE80211_STA_DISABLE_VHT;
 321                         break;
 322                 }
 323
 324                 ret |= ieee80211_chandef_downgrade(chandef);
 325         }
 326
 327         if (chandef->width != vht_chandef.width && !tracking)
 328                 sdata_info(sdata,
 329                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 330
 331         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 332         return ret;
 333 }
 334
 335 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 336                                struct sta_info *sta,
 337                                const struct ieee80211_ht_cap *ht_cap,
 338                                const struct ieee80211_ht_operation *ht_oper,
 339                                const struct ieee80211_vht_operation *vht_oper,
 340                                const u8 *bssid, u32 *changed)
 341 {
 342         struct ieee80211_local *local = sdata->local;
 343         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 344         struct ieee80211_supported_band *sband;
 345         struct ieee80211_channel *chan;
 346         struct cfg80211_chan_def chandef;
 347         u16 ht_opmode;
 348         u32 flags;
 349         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 350         int ret;
 351
 352         /* if HT was/is disabled, don't track any bandwidth changes */
 353         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 354                 return 0;
 355
 356         /* don't check VHT if we associated as non-VHT station */
 357         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 358                 vht_oper = NULL;
 359
 360         if (WARN_ON_ONCE(!sta))
 361                 return -EINVAL;
 362
 363         /*
 364          * if bss configuration changed store the new one -
 365          * this may be applicable even if channel is identical
 366          */
 367         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 368         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 369                 *changed |= BSS_CHANGED_HT;
 370                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 371         }
 372
 373         chan = sdata->vif.bss_conf.chandef.chan;
 374         sband = local->hw.wiphy->bands[chan->band];
 375
 376         /* calculate new channel (type) based on HT/VHT operation IEs */
 377         flags = ieee80211_determine_chantype(sdata, sband, chan,
 378                                              ht_cap, ht_oper, vht_oper,
 379                                              &chandef, true);
 380
 381         /*
 382          * Downgrade the new channel if we associated with restricted
 383          * capabilities. For example, if we associated as a 20 MHz STA
 384          * to a 40 MHz AP (due to regulatory, capabilities or config
 385          * reasons) then switching to a 40 MHz channel now won't do us
 386          * any good -- we couldn't use it with the AP.
 387          */
 388         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 389             chandef.width == NL80211_CHAN_WIDTH_80P80)
 390                 flags |= ieee80211_chandef_downgrade(&chandef);
 391         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 392             chandef.width == NL80211_CHAN_WIDTH_160)
 393                 flags |= ieee80211_chandef_downgrade(&chandef);
 394         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 395             chandef.width > NL80211_CHAN_WIDTH_20)
 396                 flags |= ieee80211_chandef_downgrade(&chandef);
 397
 398         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 399                 return 0;
 400
 401         sdata_info(sdata,
 402                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 403                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 404                    chandef.center_freq1, chandef.center_freq2);
 405
 406         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 407                                       IEEE80211_STA_DISABLE_VHT |
 408                                       IEEE80211_STA_DISABLE_40MHZ |
 409                                       IEEE80211_STA_DISABLE_80P80MHZ |
 410                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 411             !cfg80211_chandef_valid(&chandef)) {
 412                 sdata_info(sdata,
 413                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 414                            ifmgd->bssid);
 415                 return -EINVAL;
 416         }
 417
 418         switch (chandef.width) {
 419         case NL80211_CHAN_WIDTH_20_NOHT:
 420         case NL80211_CHAN_WIDTH_20:
 421                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 422                 break;
 423         case NL80211_CHAN_WIDTH_40:
 424                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 425                 break;
 426         case NL80211_CHAN_WIDTH_80:
 427                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 428                 break;
 429         case NL80211_CHAN_WIDTH_80P80:
 430         case NL80211_CHAN_WIDTH_160:
 431                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 432                 break;
 433         default:
 434                 return -EINVAL;
 435         }
 436
 437         if (new_sta_bw > sta->cur_max_bandwidth)
 438                 new_sta_bw = sta->cur_max_bandwidth;
 439
 440         if (new_sta_bw < sta->sta.bandwidth) {
 441                 sta->sta.bandwidth = new_sta_bw;
 442                 rate_control_rate_update(local, sband, sta,
 443                                          IEEE80211_RC_BW_CHANGED);
 444         }
 445
 446         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 447         if (ret) {
 448                 sdata_info(sdata,
 449                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 450                            ifmgd->bssid);
 451                 return ret;
 452         }
 453
 454         if (new_sta_bw > sta->sta.bandwidth) {
 455                 sta->sta.bandwidth = new_sta_bw;
 456                 rate_control_rate_update(local, sband, sta,
 457                                          IEEE80211_RC_BW_CHANGED);
 458         }
 459
 460         return 0;
 461 }
 462
 463 /* frame sending functions */
 464
 465 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 466                                 struct sk_buff *skb, u8 ap_ht_param,
 467                                 struct ieee80211_supported_band *sband,
 468                                 struct ieee80211_channel *channel,
 469                                 enum ieee80211_smps_mode smps)
 470 {
 471         u8 *pos;
 472         u32 flags = channel->flags;
 473         u16 cap;
 474         struct ieee80211_sta_ht_cap ht_cap;
 475
 476         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 477
 478         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 479         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 480
 481         /* determine capability flags */
 482         cap = ht_cap.cap;
 483
 484         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 485         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 486                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 487                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 488                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 489                 }
 490                 break;
 491         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 492                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 493                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 494                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 495                 }
 496                 break;
 497         }
 498
 499         /*
 500          * If 40 MHz was disabled associate as though we weren't
 501          * capable of 40 MHz -- some broken APs will never fall
 502          * back to trying to transmit in 20 MHz.
 503          */
 504         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 505                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 506                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 507         }
 508
 509         /* set SM PS mode properly */
 510         cap &= ~IEEE80211_HT_CAP_SM_PS;
 511         switch (smps) {
 512         case IEEE80211_SMPS_AUTOMATIC:
 513         case IEEE80211_SMPS_NUM_MODES:
 514                 WARN_ON(1);
 515         case IEEE80211_SMPS_OFF:
 516                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 517                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 518                 break;
 519         case IEEE80211_SMPS_STATIC:
 520                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 521                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 522                 break;
 523         case IEEE80211_SMPS_DYNAMIC:
 524                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 525                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 526                 break;
 527         }
 528
 529         /* reserve and fill IE */
 530         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 531         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 532 }
 533
 534 /* This function determines vht capability flags for the association
 535  * and builds the IE.
 536  * Note - the function may set the owner of the MU-MIMO capability
 537  */
 538 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 539                                  struct sk_buff *skb,
 540                                  struct ieee80211_supported_band *sband,
 541                                  struct ieee80211_vht_cap *ap_vht_cap)
 542 {
 543         struct ieee80211_local *local = sdata->local;
 544         u8 *pos;
 545         u32 cap;
 546         struct ieee80211_sta_vht_cap vht_cap;
 547         u32 mask, ap_bf_sts, our_bf_sts;
 548
 549         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 550
 551         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 552         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 553
 554         /* determine capability flags */
 555         cap = vht_cap.cap;
 556
 557         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 558                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 559
 560                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 561                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 562                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 563                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 564         }
 565
 566         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 567                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 568                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 569         }
 570
 571         /*
 572          * Some APs apparently get confused if our capabilities are better
 573          * than theirs, so restrict what we advertise in the assoc request.
 574          */
 575         if (!(ap_vht_cap->vht_cap_info &
 576                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 577                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 578                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 579         else if (!(ap_vht_cap->vht_cap_info &
 580                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 581                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 582
 583         /*
 584          * If some other vif is using the MU-MIMO capablity we cannot associate
 585          * using MU-MIMO - this will lead to contradictions in the group-id
 586          * mechanism.
 587          * Ownership is defined since association request, in order to avoid
 588          * simultaneous associations with MU-MIMO.
 589          */
 590         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 591                 bool disable_mu_mimo = false;
 592                 struct ieee80211_sub_if_data *other;
 593
 594                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 595                         if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) {
 596                                 disable_mu_mimo = true;
 597                                 break;
 598                         }
 599                 }
 600                 if (disable_mu_mimo)
 601                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 602                 else
 603                         sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER;
 604         }
 605
 606         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 607
 608         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 609         our_bf_sts = cap & mask;
 610
 611         if (ap_bf_sts < our_bf_sts) {
 612                 cap &= ~mask;
 613                 cap |= ap_bf_sts;
 614         }
 615
 616         /* reserve and fill IE */
 617         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 618         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 619 }
 620
 621 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 622 {
 623         struct ieee80211_local *local = sdata->local;
 624         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 625         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 626         struct sk_buff *skb;
 627         struct ieee80211_mgmt *mgmt;
 628         u8 *pos, qos_info;
 629         size_t offset = 0, noffset;
 630         int i, count, rates_len, supp_rates_len, shift;
 631         u16 capab;
 632         struct ieee80211_supported_band *sband;
 633         struct ieee80211_chanctx_conf *chanctx_conf;
 634         struct ieee80211_channel *chan;
 635         u32 rate_flags, rates = 0;
 636
 637         sdata_assert_lock(sdata);
 638
 639         rcu_read_lock();
 640         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 641         if (WARN_ON(!chanctx_conf)) {
 642                 rcu_read_unlock();
 643                 return;
 644         }
 645         chan = chanctx_conf->def.chan;
 646         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 647         rcu_read_unlock();
 648         sband = local->hw.wiphy->bands[chan->band];
 649         shift = ieee80211_vif_get_shift(&sdata->vif);
 650
 651         if (assoc_data->supp_rates_len) {
 652                 /*
 653                  * Get all rates supported by the device and the AP as
 654                  * some APs don't like getting a superset of their rates
 655                  * in the association request (e.g. D-Link DAP 1353 in
 656                  * b-only mode)...
 657                  */
 658                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 659                                                      assoc_data->supp_rates,
 660                                                      assoc_data->supp_rates_len,
 661                                                      &rates);
 662         } else {
 663                 /*
 664                  * In case AP not provide any supported rates information
 665                  * before association, we send information element(s) with
 666                  * all rates that we support.
 667                  */
 668                 rates_len = 0;
 669                 for (i = 0; i < sband->n_bitrates; i++) {
 670                         if ((rate_flags & sband->bitrates[i].flags)
 671                             != rate_flags)
 672                                 continue;
 673                         rates |= BIT(i);
 674                         rates_len++;
 675                 }
 676         }
 677
 678         skb = alloc_skb(local->hw.extra_tx_headroom +
 679                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 680                         2 + assoc_data->ssid_len + /* SSID */
 681                         4 + rates_len + /* (extended) rates */
 682                         4 + /* power capability */
 683                         2 + 2 * sband->n_channels + /* supported channels */
 684                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 685                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 686                         assoc_data->ie_len + /* extra IEs */
 687                         9, /* WMM */
 688                         GFP_KERNEL);
 689         if (!skb)
 690                 return;
 691
 692         skb_reserve(skb, local->hw.extra_tx_headroom);
 693
 694         capab = WLAN_CAPABILITY_ESS;
 695
 696         if (sband->band == IEEE80211_BAND_2GHZ) {
 697                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 698                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 699         }
 700
 701         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 702                 capab |= WLAN_CAPABILITY_PRIVACY;
 703
 704         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 705             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 706                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 707
 708         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 709                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 710
 711         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 712         memset(mgmt, 0, 24);
 713         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 714         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 715         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 716
 717         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 718                 skb_put(skb, 10);
 719                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 720                                                   IEEE80211_STYPE_REASSOC_REQ);
 721                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 722                 mgmt->u.reassoc_req.listen_interval =
 723                                 cpu_to_le16(local->hw.conf.listen_interval);
 724                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 725                        ETH_ALEN);
 726         } else {
 727                 skb_put(skb, 4);
 728                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 729                                                   IEEE80211_STYPE_ASSOC_REQ);
 730                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 731                 mgmt->u.assoc_req.listen_interval =
 732                                 cpu_to_le16(local->hw.conf.listen_interval);
 733         }
 734
 735         /* SSID */
 736         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 737         *pos++ = WLAN_EID_SSID;
 738         *pos++ = assoc_data->ssid_len;
 739         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 740
 741         /* add all rates which were marked to be used above */
 742         supp_rates_len = rates_len;
 743         if (supp_rates_len > 8)
 744                 supp_rates_len = 8;
 745
 746         pos = skb_put(skb, supp_rates_len + 2);
 747         *pos++ = WLAN_EID_SUPP_RATES;
 748         *pos++ = supp_rates_len;
 749
 750         count = 0;
 751         for (i = 0; i < sband->n_bitrates; i++) {
 752                 if (BIT(i) & rates) {
 753                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 754                                                 5 * (1 << shift));
 755                         *pos++ = (u8) rate;
 756                         if (++count == 8)
 757                                 break;
 758                 }
 759         }
 760
 761         if (rates_len > count) {
 762                 pos = skb_put(skb, rates_len - count + 2);
 763                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 764                 *pos++ = rates_len - count;
 765
 766                 for (i++; i < sband->n_bitrates; i++) {
 767                         if (BIT(i) & rates) {
 768                                 int rate;
 769                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 770                                                     5 * (1 << shift));
 771                                 *pos++ = (u8) rate;
 772                         }
 773                 }
 774         }
 775
 776         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 777             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 778                 pos = skb_put(skb, 4);
 779                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 780                 *pos++ = 2;
 781                 *pos++ = 0; /* min tx power */
 782                  /* max tx power */
 783                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 784         }
 785
 786         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 787                 /* TODO: get this in reg domain format */
 788                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 789                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 790                 *pos++ = 2 * sband->n_channels;
 791                 for (i = 0; i < sband->n_channels; i++) {
 792                         *pos++ = ieee80211_frequency_to_channel(
 793                                         sband->channels[i].center_freq);
 794                         *pos++ = 1; /* one channel in the subband*/
 795                 }
 796         }
 797
 798         /* if present, add any custom IEs that go before HT */
 799         if (assoc_data->ie_len) {
 800                 static const u8 before_ht[] = {
 801                         WLAN_EID_SSID,
 802                         WLAN_EID_SUPP_RATES,
 803                         WLAN_EID_EXT_SUPP_RATES,
 804                         WLAN_EID_PWR_CAPABILITY,
 805                         WLAN_EID_SUPPORTED_CHANNELS,
 806                         WLAN_EID_RSN,
 807                         WLAN_EID_QOS_CAPA,
 808                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 809                         WLAN_EID_MOBILITY_DOMAIN,
 810                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 811                         WLAN_EID_RIC_DATA,              /* reassoc only */
 812                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 813                 };
 814                 static const u8 after_ric[] = {
 815                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 816                         WLAN_EID_HT_CAPABILITY,
 817                         WLAN_EID_BSS_COEX_2040,
 818                         WLAN_EID_EXT_CAPABILITY,
 819                         WLAN_EID_QOS_TRAFFIC_CAPA,
 820                         WLAN_EID_TIM_BCAST_REQ,
 821                         WLAN_EID_INTERWORKING,
 822                         /* 60GHz doesn't happen right now */
 823                         WLAN_EID_VHT_CAPABILITY,
 824                         WLAN_EID_OPMODE_NOTIF,
 825                 };
 826
 827                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 828                                                  assoc_data->ie_len,
 829                                                  before_ht,
 830                                                  ARRAY_SIZE(before_ht),
 831                                                  after_ric,
 832                                                  ARRAY_SIZE(after_ric),
 833                                                  offset);
 834                 pos = skb_put(skb, noffset - offset);
 835                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 836                 offset = noffset;
 837         }
 838
 839         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 840                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 841                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 842
 843         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 844                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 845                                     sband, chan, sdata->smps_mode);
 846
 847         /* if present, add any custom IEs that go before VHT */
 848         if (assoc_data->ie_len) {
 849                 static const u8 before_vht[] = {
 850                         WLAN_EID_SSID,
 851                         WLAN_EID_SUPP_RATES,
 852                         WLAN_EID_EXT_SUPP_RATES,
 853                         WLAN_EID_PWR_CAPABILITY,
 854                         WLAN_EID_SUPPORTED_CHANNELS,
 855                         WLAN_EID_RSN,
 856                         WLAN_EID_QOS_CAPA,
 857                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 858                         WLAN_EID_MOBILITY_DOMAIN,
 859                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 860                         WLAN_EID_HT_CAPABILITY,
 861                         WLAN_EID_BSS_COEX_2040,
 862                         WLAN_EID_EXT_CAPABILITY,
 863                         WLAN_EID_QOS_TRAFFIC_CAPA,
 864                         WLAN_EID_TIM_BCAST_REQ,
 865                         WLAN_EID_INTERWORKING,
 866                 };
 867
 868                 /* RIC already taken above, so no need to handle here anymore */
 869                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 870                                              before_vht, ARRAY_SIZE(before_vht),
 871                                              offset);
 872                 pos = skb_put(skb, noffset - offset);
 873                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 874                 offset = noffset;
 875         }
 876
 877         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 878                 ieee80211_add_vht_ie(sdata, skb, sband,
 879                                      &assoc_data->ap_vht_cap);
 880
 881         /* if present, add any custom non-vendor IEs that go after HT */
 882         if (assoc_data->ie_len) {
 883                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 884                                                     assoc_data->ie_len,
 885                                                     offset);
 886                 pos = skb_put(skb, noffset - offset);
 887                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 888                 offset = noffset;
 889         }
 890
 891         if (assoc_data->wmm) {
 892                 if (assoc_data->uapsd) {
 893                         qos_info = ifmgd->uapsd_queues;
 894                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 895                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 896                 } else {
 897                         qos_info = 0;
 898                 }
 899
 900                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 901         }
 902
 903         /* add any remaining custom (i.e. vendor specific here) IEs */
 904         if (assoc_data->ie_len) {
 905                 noffset = assoc_data->ie_len;
 906                 pos = skb_put(skb, noffset - offset);
 907                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 908         }
 909
 910         drv_mgd_prepare_tx(local, sdata);
 911
 912         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 913         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 914                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 915                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 916         ieee80211_tx_skb(sdata, skb);
 917 }
 918
 919 void ieee80211_send_pspoll(struct ieee80211_local *local,
 920                            struct ieee80211_sub_if_data *sdata)
 921 {
 922         struct ieee80211_pspoll *pspoll;
 923         struct sk_buff *skb;
 924
 925         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 926         if (!skb)
 927                 return;
 928
 929         pspoll = (struct ieee80211_pspoll *) skb->data;
 930         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 931
 932         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 933         ieee80211_tx_skb(sdata, skb);
 934 }
 935
 936 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 937                              struct ieee80211_sub_if_data *sdata,
 938                              bool powersave)
 939 {
 940         struct sk_buff *skb;
 941         struct ieee80211_hdr_3addr *nullfunc;
 942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 943
 944         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 945         if (!skb)
 946                 return;
 947
 948         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 949         if (powersave)
 950                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 951
 952         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 953                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 954
 955         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 956                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 957
 958         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 959                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 960
 961         ieee80211_tx_skb(sdata, skb);
 962 }
 963
 964 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 965                                           struct ieee80211_sub_if_data *sdata)
 966 {
 967         struct sk_buff *skb;
 968         struct ieee80211_hdr *nullfunc;
 969         __le16 fc;
 970
 971         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 972                 return;
 973
 974         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 975         if (!skb)
 976                 return;
 977
 978         skb_reserve(skb, local->hw.extra_tx_headroom);
 979
 980         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 981         memset(nullfunc, 0, 30);
 982         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 983                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 984         nullfunc->frame_control = fc;
 985         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 986         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 987         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 988         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 989
 990         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 991         ieee80211_tx_skb(sdata, skb);
 992 }
 993
 994 /* spectrum management related things */
 995 static void ieee80211_chswitch_work(struct work_struct *work)
 996 {
 997         struct ieee80211_sub_if_data *sdata =
 998                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 999         struct ieee80211_local *local = sdata->local;
1000         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1001         int ret;
1002
1003         if (!ieee80211_sdata_running(sdata))
1004                 return;
1005
1006         sdata_lock(sdata);
1007         mutex_lock(&local->mtx);
1008         mutex_lock(&local->chanctx_mtx);
1009
1010         if (!ifmgd->associated)
1011                 goto out;
1012
1013         if (!sdata->vif.csa_active)
1014                 goto out;
1015
1016         /*
1017          * using reservation isn't immediate as it may be deferred until later
1018          * with multi-vif. once reservation is complete it will re-schedule the
1019          * work with no reserved_chanctx so verify chandef to check if it
1020          * completed successfully
1021          */
1022
1023         if (sdata->reserved_chanctx) {
1024                 struct ieee80211_supported_band *sband = NULL;
1025                 struct sta_info *mgd_sta = NULL;
1026                 enum ieee80211_sta_rx_bandwidth bw = IEEE80211_STA_RX_BW_20;
1027
1028                 /*
1029                  * with multi-vif csa driver may call ieee80211_csa_finish()
1030                  * many times while waiting for other interfaces to use their
1031                  * reservations
1032                  */
1033                 if (sdata->reserved_ready)
1034                         goto out;
1035
1036                 if (sdata->vif.bss_conf.chandef.width !=
1037                     sdata->csa_chandef.width) {
1038                         /*
1039                          * For managed interface, we need to also update the AP
1040                          * station bandwidth and align the rate scale algorithm
1041                          * on the bandwidth change. Here we only consider the
1042                          * bandwidth of the new channel definition (as channel
1043                          * switch flow does not have the full HT/VHT/HE
1044                          * information), assuming that if additional changes are
1045                          * required they would be done as part of the processing
1046                          * of the next beacon from the AP.
1047                          */
1048                         switch (sdata->csa_chandef.width) {
1049                         case NL80211_CHAN_WIDTH_20_NOHT:
1050                         case NL80211_CHAN_WIDTH_20:
1051                         default:
1052                                 bw = IEEE80211_STA_RX_BW_20;
1053                                 break;
1054                         case NL80211_CHAN_WIDTH_40:
1055                                 bw = IEEE80211_STA_RX_BW_40;
1056                                 break;
1057                         case NL80211_CHAN_WIDTH_80:
1058                                 bw = IEEE80211_STA_RX_BW_80;
1059                                 break;
1060                         case NL80211_CHAN_WIDTH_80P80:
1061                         case NL80211_CHAN_WIDTH_160:
1062                                 bw = IEEE80211_STA_RX_BW_160;
1063                                 break;
1064                         }
1065
1066                         mgd_sta = sta_info_get(sdata, ifmgd->bssid);
1067                         sband =
1068                                 local->hw.wiphy->bands[sdata->csa_chandef.chan->band];
1069                 }
1070
1071                 if (sdata->vif.bss_conf.chandef.width >
1072                     sdata->csa_chandef.width) {
1073                         mgd_sta->sta.bandwidth = bw;
1074                         rate_control_rate_update(local, sband, mgd_sta,
1075                                                  IEEE80211_RC_BW_CHANGED);
1076                 }
1077
1078                 ret = ieee80211_vif_use_reserved_context(sdata);
1079                 if (ret) {
1080                         sdata_info(sdata,
1081                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1082                                    ret);
1083                         ieee80211_queue_work(&sdata->local->hw,
1084                                              &ifmgd->csa_connection_drop_work);
1085                         goto out;
1086                 }
1087
1088                 if (sdata->vif.bss_conf.chandef.width <
1089                     sdata->csa_chandef.width) {
1090                         mgd_sta->sta.bandwidth = bw;
1091                         rate_control_rate_update(local, sband, mgd_sta,
1092                                                  IEEE80211_RC_BW_CHANGED);
1093                 }
1094
1095                 goto out;
1096         }
1097
1098         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1099                                         &sdata->csa_chandef)) {
1100                 sdata_info(sdata,
1101                            "failed to finalize channel switch, disconnecting\n");
1102                 ieee80211_queue_work(&sdata->local->hw,
1103                                      &ifmgd->csa_connection_drop_work);
1104                 goto out;
1105         }
1106
1107         ifmgd->csa_waiting_bcn = true;
1108
1109         ieee80211_sta_reset_beacon_monitor(sdata);
1110         ieee80211_sta_reset_conn_monitor(sdata);
1111
1112 out:
1113         mutex_unlock(&local->chanctx_mtx);
1114         mutex_unlock(&local->mtx);
1115         sdata_unlock(sdata);
1116 }
1117
1118 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1119 {
1120         struct ieee80211_local *local = sdata->local;
1121         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1122         int ret;
1123
1124         sdata_assert_lock(sdata);
1125
1126         WARN_ON(!sdata->vif.csa_active);
1127
1128         if (sdata->csa_block_tx) {
1129                 ieee80211_wake_vif_queues(local, sdata,
1130                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1131                 sdata->csa_block_tx = false;
1132         }
1133
1134         sdata->vif.csa_active = false;
1135         ifmgd->csa_waiting_bcn = false;
1136         /*
1137          * If the CSA IE is still present on the beacon after the switch,
1138          * we need to consider it as a new CSA (possibly to self).
1139          */
1140         ifmgd->beacon_crc_valid = false;
1141
1142         ret = drv_post_channel_switch(sdata);
1143         if (ret) {
1144                 sdata_info(sdata,
1145                            "driver post channel switch failed, disconnecting\n");
1146                 ieee80211_queue_work(&local->hw,
1147                                      &ifmgd->csa_connection_drop_work);
1148                 return;
1149         }
1150
1151         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1152 }
1153
1154 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1155 {
1156         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1157         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1158
1159         trace_api_chswitch_done(sdata, success);
1160         if (!success) {
1161                 sdata_info(sdata,
1162                            "driver channel switch failed, disconnecting\n");
1163                 ieee80211_queue_work(&sdata->local->hw,
1164                                      &ifmgd->csa_connection_drop_work);
1165         } else {
1166                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1167         }
1168 }
1169 EXPORT_SYMBOL(ieee80211_chswitch_done);
1170
1171 static void ieee80211_chswitch_timer(unsigned long data)
1172 {
1173         struct ieee80211_sub_if_data *sdata =
1174                 (struct ieee80211_sub_if_data *) data;
1175
1176         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1177 }
1178
1179 static void
1180 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1181                                  u64 timestamp, u32 device_timestamp,
1182                                  struct ieee802_11_elems *elems,
1183                                  bool beacon)
1184 {
1185         struct ieee80211_local *local = sdata->local;
1186         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1187         struct cfg80211_bss *cbss = ifmgd->associated;
1188         struct ieee80211_chanctx_conf *conf;
1189         struct ieee80211_chanctx *chanctx;
1190         enum ieee80211_band current_band;
1191         struct ieee80211_csa_ie csa_ie;
1192         struct ieee80211_channel_switch ch_switch;
1193         int res;
1194
1195         sdata_assert_lock(sdata);
1196
1197         if (!cbss)
1198                 return;
1199
1200         if (local->scanning)
1201                 return;
1202
1203         /* disregard subsequent announcements if we are already processing */
1204         if (sdata->vif.csa_active)
1205                 return;
1206
1207         current_band = cbss->channel->band;
1208         memset(&csa_ie, 0, sizeof(csa_ie));
1209         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1210                                            ifmgd->flags,
1211                                            ifmgd->associated->bssid, &csa_ie);
1212         if (res < 0)
1213                 ieee80211_queue_work(&local->hw,
1214                                      &ifmgd->csa_connection_drop_work);
1215         if (res)
1216                 return;
1217
1218         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1219                                      IEEE80211_CHAN_DISABLED)) {
1220                 sdata_info(sdata,
1221                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1222                            ifmgd->associated->bssid,
1223                            csa_ie.chandef.chan->center_freq,
1224                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1225                            csa_ie.chandef.center_freq2);
1226                 ieee80211_queue_work(&local->hw,
1227                                      &ifmgd->csa_connection_drop_work);
1228                 return;
1229         }
1230
1231         if (cfg80211_chandef_identical(&csa_ie.chandef,
1232                                        &sdata->vif.bss_conf.chandef)) {
1233                 if (ifmgd->csa_ignored_same_chan)
1234                         return;
1235                 sdata_info(sdata,
1236                            "AP %pM tries to chanswitch to same channel, ignore\n",
1237                            ifmgd->associated->bssid);
1238                 ifmgd->csa_ignored_same_chan = true;
1239                 return;
1240         }
1241
1242         /*
1243          * Drop all TDLS peers - either we disconnect or move to a different
1244          * channel from this point on. There's no telling what our peer will do.
1245          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1246          * have an incompatible wider chandef.
1247          */
1248         ieee80211_teardown_tdls_peers(sdata);
1249
1250         mutex_lock(&local->mtx);
1251         mutex_lock(&local->chanctx_mtx);
1252         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1253                                          lockdep_is_held(&local->chanctx_mtx));
1254         if (!conf) {
1255                 sdata_info(sdata,
1256                            "no channel context assigned to vif?, disconnecting\n");
1257                 goto drop_connection;
1258         }
1259
1260         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1261
1262         if (local->use_chanctx &&
1263             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1264                 sdata_info(sdata,
1265                            "driver doesn't support chan-switch with channel contexts\n");
1266                 goto drop_connection;
1267         }
1268
1269         ch_switch.timestamp = timestamp;
1270         ch_switch.device_timestamp = device_timestamp;
1271         ch_switch.block_tx = csa_ie.mode;
1272         ch_switch.chandef = csa_ie.chandef;
1273         ch_switch.count = csa_ie.count;
1274
1275         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1276                 sdata_info(sdata,
1277                            "preparing for channel switch failed, disconnecting\n");
1278                 goto drop_connection;
1279         }
1280
1281         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1282                                             chanctx->mode, false);
1283         if (res) {
1284                 sdata_info(sdata,
1285                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1286                            res);
1287                 goto drop_connection;
1288         }
1289         mutex_unlock(&local->chanctx_mtx);
1290
1291         sdata->vif.csa_active = true;
1292         sdata->csa_chandef = csa_ie.chandef;
1293         sdata->csa_block_tx = csa_ie.mode;
1294         ifmgd->csa_ignored_same_chan = false;
1295
1296         if (sdata->csa_block_tx)
1297                 ieee80211_stop_vif_queues(local, sdata,
1298                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1299         mutex_unlock(&local->mtx);
1300
1301         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1302                                           csa_ie.count);
1303
1304         if (local->ops->channel_switch) {
1305                 /* use driver's channel switch callback */
1306                 drv_channel_switch(local, sdata, &ch_switch);
1307                 return;
1308         }
1309
1310         /* channel switch handled in software */
1311         if (csa_ie.count <= 1)
1312                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1313         else
1314                 mod_timer(&ifmgd->chswitch_timer,
1315                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1316                                          cbss->beacon_interval));
1317         return;
1318  drop_connection:
1319         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1320         mutex_unlock(&local->chanctx_mtx);
1321         mutex_unlock(&local->mtx);
1322 }
1323
1324 static bool
1325 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1326                                  struct ieee80211_channel *channel,
1327                                  const u8 *country_ie, u8 country_ie_len,
1328                                  const u8 *pwr_constr_elem,
1329                                  int *chan_pwr, int *pwr_reduction)
1330 {
1331         struct ieee80211_country_ie_triplet *triplet;
1332         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1333         int i, chan_increment;
1334         bool have_chan_pwr = false;
1335
1336         /* Invalid IE */
1337         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1338                 return false;
1339
1340         triplet = (void *)(country_ie + 3);
1341         country_ie_len -= 3;
1342
1343         switch (channel->band) {
1344         default:
1345                 WARN_ON_ONCE(1);
1346                 /* fall through */
1347         case IEEE80211_BAND_2GHZ:
1348         case IEEE80211_BAND_60GHZ:
1349                 chan_increment = 1;
1350                 break;
1351         case IEEE80211_BAND_5GHZ:
1352                 chan_increment = 4;
1353                 break;
1354         }
1355
1356         /* find channel */
1357         while (country_ie_len >= 3) {
1358                 u8 first_channel = triplet->chans.first_channel;
1359
1360                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1361                         goto next;
1362
1363                 for (i = 0; i < triplet->chans.num_channels; i++) {
1364                         if (first_channel + i * chan_increment == chan) {
1365                                 have_chan_pwr = true;
1366                                 *chan_pwr = triplet->chans.max_power;
1367                                 break;
1368                         }
1369                 }
1370                 if (have_chan_pwr)
1371                         break;
1372
1373  next:
1374                 triplet++;
1375                 country_ie_len -= 3;
1376         }
1377
1378         if (have_chan_pwr && pwr_constr_elem)
1379                 *pwr_reduction = *pwr_constr_elem;
1380         else
1381                 *pwr_reduction = 0;
1382
1383         return have_chan_pwr;
1384 }
1385
1386 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1387                                       struct ieee80211_channel *channel,
1388                                       const u8 *cisco_dtpc_ie,
1389                                       int *pwr_level)
1390 {
1391         /* From practical testing, the first data byte of the DTPC element
1392          * seems to contain the requested dBm level, and the CLI on Cisco
1393          * APs clearly state the range is -127 to 127 dBm, which indicates
1394          * a signed byte, although it seemingly never actually goes negative.
1395          * The other byte seems to always be zero.
1396          */
1397         *pwr_level = (__s8)cisco_dtpc_ie[4];
1398 }
1399
1400 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1401                                        struct ieee80211_channel *channel,
1402                                        struct ieee80211_mgmt *mgmt,
1403                                        const u8 *country_ie, u8 country_ie_len,
1404                                        const u8 *pwr_constr_ie,
1405                                        const u8 *cisco_dtpc_ie)
1406 {
1407         bool has_80211h_pwr = false, has_cisco_pwr = false;
1408         int chan_pwr = 0, pwr_reduction_80211h = 0;
1409         int pwr_level_cisco, pwr_level_80211h;
1410         int new_ap_level;
1411         __le16 capab = mgmt->u.probe_resp.capab_info;
1412
1413         if (country_ie &&
1414             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1415              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1416                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1417                         sdata, channel, country_ie, country_ie_len,
1418                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1419                 pwr_level_80211h =
1420                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1421         }
1422
1423         if (cisco_dtpc_ie) {
1424                 ieee80211_find_cisco_dtpc(
1425                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1426                 has_cisco_pwr = true;
1427         }
1428
1429         if (!has_80211h_pwr && !has_cisco_pwr)
1430                 return 0;
1431
1432         /* If we have both 802.11h and Cisco DTPC, apply both limits
1433          * by picking the smallest of the two power levels advertised.
1434          */
1435         if (has_80211h_pwr &&
1436             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1437                 new_ap_level = pwr_level_80211h;
1438
1439                 if (sdata->ap_power_level == new_ap_level)
1440                         return 0;
1441
1442                 sdata_dbg(sdata,
1443                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1444                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1445                           sdata->u.mgd.bssid);
1446         } else {  /* has_cisco_pwr is always true here. */
1447                 new_ap_level = pwr_level_cisco;
1448
1449                 if (sdata->ap_power_level == new_ap_level)
1450                         return 0;
1451
1452                 sdata_dbg(sdata,
1453                           "Limiting TX power to %d dBm as advertised by %pM\n",
1454                           pwr_level_cisco, sdata->u.mgd.bssid);
1455         }
1456
1457         sdata->ap_power_level = new_ap_level;
1458         if (__ieee80211_recalc_txpower(sdata))
1459                 return BSS_CHANGED_TXPOWER;
1460         return 0;
1461 }
1462
1463 /* powersave */
1464 static void ieee80211_enable_ps(struct ieee80211_local *local,
1465                                 struct ieee80211_sub_if_data *sdata)
1466 {
1467         struct ieee80211_conf *conf = &local->hw.conf;
1468
1469         /*
1470          * If we are scanning right now then the parameters will
1471          * take effect when scan finishes.
1472          */
1473         if (local->scanning)
1474                 return;
1475
1476         if (conf->dynamic_ps_timeout > 0 &&
1477             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1478                 mod_timer(&local->dynamic_ps_timer, jiffies +
1479                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1480         } else {
1481                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1482                         ieee80211_send_nullfunc(local, sdata, true);
1483
1484                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1485                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1486                         return;
1487
1488                 conf->flags |= IEEE80211_CONF_PS;
1489                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1490         }
1491 }
1492
1493 static void ieee80211_change_ps(struct ieee80211_local *local)
1494 {
1495         struct ieee80211_conf *conf = &local->hw.conf;
1496
1497         if (local->ps_sdata) {
1498                 ieee80211_enable_ps(local, local->ps_sdata);
1499         } else if (conf->flags & IEEE80211_CONF_PS) {
1500                 conf->flags &= ~IEEE80211_CONF_PS;
1501                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1502                 del_timer_sync(&local->dynamic_ps_timer);
1503                 cancel_work_sync(&local->dynamic_ps_enable_work);
1504         }
1505 }
1506
1507 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1508 {
1509         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1510         struct sta_info *sta = NULL;
1511         bool authorized = false;
1512
1513         if (!mgd->powersave)
1514                 return false;
1515
1516         if (mgd->broken_ap)
1517                 return false;
1518
1519         if (!mgd->associated)
1520                 return false;
1521
1522         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1523                 return false;
1524
1525         if (!mgd->have_beacon)
1526                 return false;
1527
1528         rcu_read_lock();
1529         sta = sta_info_get(sdata, mgd->bssid);
1530         if (sta)
1531                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1532         rcu_read_unlock();
1533
1534         return authorized;
1535 }
1536
1537 /* need to hold RTNL or interface lock */
1538 void ieee80211_recalc_ps(struct ieee80211_local *local)
1539 {
1540         struct ieee80211_sub_if_data *sdata, *found = NULL;
1541         int count = 0;
1542         int timeout;
1543
1544         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1545                 local->ps_sdata = NULL;
1546                 return;
1547         }
1548
1549         list_for_each_entry(sdata, &local->interfaces, list) {
1550                 if (!ieee80211_sdata_running(sdata))
1551                         continue;
1552                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1553                         /* If an AP vif is found, then disable PS
1554                          * by setting the count to zero thereby setting
1555                          * ps_sdata to NULL.
1556                          */
1557                         count = 0;
1558                         break;
1559                 }
1560                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1561                         continue;
1562                 found = sdata;
1563                 count++;
1564         }
1565
1566         if (count == 1 && ieee80211_powersave_allowed(found)) {
1567                 u8 dtimper = found->u.mgd.dtim_period;
1568                 s32 beaconint_us;
1569
1570                 beaconint_us = ieee80211_tu_to_usec(
1571                                         found->vif.bss_conf.beacon_int);
1572
1573                 timeout = local->dynamic_ps_forced_timeout;
1574                 if (timeout < 0)
1575                         timeout = 100;
1576                 local->hw.conf.dynamic_ps_timeout = timeout;
1577
1578                 /* If the TIM IE is invalid, pretend the value is 1 */
1579                 if (!dtimper)
1580                         dtimper = 1;
1581
1582                 local->hw.conf.ps_dtim_period = dtimper;
1583                 local->ps_sdata = found;
1584         } else {
1585                 local->ps_sdata = NULL;
1586         }
1587
1588         ieee80211_change_ps(local);
1589 }
1590
1591 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1592 {
1593         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1594
1595         if (sdata->vif.bss_conf.ps != ps_allowed) {
1596                 sdata->vif.bss_conf.ps = ps_allowed;
1597                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1598         }
1599 }
1600
1601 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1602 {
1603         struct ieee80211_local *local =
1604                 container_of(work, struct ieee80211_local,
1605                              dynamic_ps_disable_work);
1606
1607         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1608                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1609                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1610         }
1611
1612         ieee80211_wake_queues_by_reason(&local->hw,
1613                                         IEEE80211_MAX_QUEUE_MAP,
1614                                         IEEE80211_QUEUE_STOP_REASON_PS,
1615                                         false);
1616 }
1617
1618 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1619 {
1620         struct ieee80211_local *local =
1621                 container_of(work, struct ieee80211_local,
1622                              dynamic_ps_enable_work);
1623         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1624         struct ieee80211_if_managed *ifmgd;
1625         unsigned long flags;
1626         int q;
1627
1628         /* can only happen when PS was just disabled anyway */
1629         if (!sdata)
1630                 return;
1631
1632         ifmgd = &sdata->u.mgd;
1633
1634         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1635                 return;
1636
1637         if (local->hw.conf.dynamic_ps_timeout > 0) {
1638                 /* don't enter PS if TX frames are pending */
1639                 if (drv_tx_frames_pending(local)) {
1640                         mod_timer(&local->dynamic_ps_timer, jiffies +
1641                                   msecs_to_jiffies(
1642                                   local->hw.conf.dynamic_ps_timeout));
1643                         return;
1644                 }
1645
1646                 /*
1647                  * transmission can be stopped by others which leads to
1648                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1649                  * is not the actual idle state.
1650                  */
1651                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1652                 for (q = 0; q < local->hw.queues; q++) {
1653                         if (local->queue_stop_reasons[q]) {
1654                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1655                                                        flags);
1656                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1657                                           msecs_to_jiffies(
1658                                           local->hw.conf.dynamic_ps_timeout));
1659                                 return;
1660                         }
1661                 }
1662                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1663         }
1664
1665         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1666             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1667                 if (drv_tx_frames_pending(local)) {
1668                         mod_timer(&local->dynamic_ps_timer, jiffies +
1669                                   msecs_to_jiffies(
1670                                   local->hw.conf.dynamic_ps_timeout));
1671                 } else {
1672                         ieee80211_send_nullfunc(local, sdata, true);
1673                         /* Flush to get the tx status of nullfunc frame */
1674                         ieee80211_flush_queues(local, sdata, false);
1675                 }
1676         }
1677
1678         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1679               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1680             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1681                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1682                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1683                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1684         }
1685 }
1686
1687 void ieee80211_dynamic_ps_timer(unsigned long data)
1688 {
1689         struct ieee80211_local *local = (void *) data;
1690
1691         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1692 }
1693
1694 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1695 {
1696         struct delayed_work *delayed_work =
1697                 container_of(work, struct delayed_work, work);
1698         struct ieee80211_sub_if_data *sdata =
1699                 container_of(delayed_work, struct ieee80211_sub_if_data,
1700                              dfs_cac_timer_work);
1701         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1702
1703         mutex_lock(&sdata->local->mtx);
1704         if (sdata->wdev.cac_started) {
1705                 ieee80211_vif_release_channel(sdata);
1706                 cfg80211_cac_event(sdata->dev, &chandef,
1707                                    NL80211_RADAR_CAC_FINISHED,
1708                                    GFP_KERNEL);
1709         }
1710         mutex_unlock(&sdata->local->mtx);
1711 }
1712
1713 static bool
1714 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1715 {
1716         struct ieee80211_local *local = sdata->local;
1717         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1718         bool ret = false;
1719         int ac;
1720
1721         if (local->hw.queues < IEEE80211_NUM_ACS)
1722                 return false;
1723
1724         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1725                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1726                 int non_acm_ac;
1727                 unsigned long now = jiffies;
1728
1729                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1730                     tx_tspec->admitted_time &&
1731                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1732                         tx_tspec->consumed_tx_time = 0;
1733                         tx_tspec->time_slice_start = now;
1734
1735                         if (tx_tspec->downgraded)
1736                                 tx_tspec->action =
1737                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1738                 }
1739
1740                 switch (tx_tspec->action) {
1741                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1742                         /* take the original parameters */
1743                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1744                                 sdata_err(sdata,
1745                                           "failed to set TX queue parameters for queue %d\n",
1746                                           ac);
1747                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1748                         tx_tspec->downgraded = false;
1749                         ret = true;
1750                         break;
1751                 case TX_TSPEC_ACTION_DOWNGRADE:
1752                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1753                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1754                                 ret = true;
1755                                 break;
1756                         }
1757                         /* downgrade next lower non-ACM AC */
1758                         for (non_acm_ac = ac + 1;
1759                              non_acm_ac < IEEE80211_NUM_ACS;
1760                              non_acm_ac++)
1761                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1762                                         break;
1763                         /* The loop will result in using BK even if it requires
1764                          * admission control, such configuration makes no sense
1765                          * and we have to transmit somehow - the AC selection
1766                          * does the same thing.
1767                          */
1768                         if (drv_conf_tx(local, sdata, ac,
1769                                         &sdata->tx_conf[non_acm_ac]))
1770                                 sdata_err(sdata,
1771                                           "failed to set TX queue parameters for queue %d\n",
1772                                           ac);
1773                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1774                         ret = true;
1775                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1776                                 tx_tspec->time_slice_start + HZ - now + 1);
1777                         break;
1778                 case TX_TSPEC_ACTION_NONE:
1779                         /* nothing now */
1780                         break;
1781                 }
1782         }
1783
1784         return ret;
1785 }
1786
1787 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1788 {
1789         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1790                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1791 }
1792
1793 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1794 {
1795         struct ieee80211_sub_if_data *sdata;
1796
1797         sdata = container_of(work, struct ieee80211_sub_if_data,
1798                              u.mgd.tx_tspec_wk.work);
1799         ieee80211_sta_handle_tspec_ac_params(sdata);
1800 }
1801
1802 /* MLME */
1803 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1804                                      struct ieee80211_sub_if_data *sdata,
1805                                      const u8 *wmm_param, size_t wmm_param_len)
1806 {
1807         struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1808         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1809         size_t left;
1810         int count, ac;
1811         const u8 *pos;
1812         u8 uapsd_queues = 0;
1813
1814         if (!local->ops->conf_tx)
1815                 return false;
1816
1817         if (local->hw.queues < IEEE80211_NUM_ACS)
1818                 return false;
1819
1820         if (!wmm_param)
1821                 return false;
1822
1823         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1824                 return false;
1825
1826         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1827                 uapsd_queues = ifmgd->uapsd_queues;
1828
1829         count = wmm_param[6] & 0x0f;
1830         if (count == ifmgd->wmm_last_param_set)
1831                 return false;
1832         ifmgd->wmm_last_param_set = count;
1833
1834         pos = wmm_param + 8;
1835         left = wmm_param_len - 8;
1836
1837         memset(&params, 0, sizeof(params));
1838
1839         sdata->wmm_acm = 0;
1840         for (; left >= 4; left -= 4, pos += 4) {
1841                 int aci = (pos[0] >> 5) & 0x03;
1842                 int acm = (pos[0] >> 4) & 0x01;
1843                 bool uapsd = false;
1844
1845                 switch (aci) {
1846                 case 1: /* AC_BK */
1847                         ac = IEEE80211_AC_BK;
1848                         if (acm)
1849                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1850                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1851                                 uapsd = true;
1852                         break;
1853                 case 2: /* AC_VI */
1854                         ac = IEEE80211_AC_VI;
1855                         if (acm)
1856                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1857                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1858                                 uapsd = true;
1859                         break;
1860                 case 3: /* AC_VO */
1861                         ac = IEEE80211_AC_VO;
1862                         if (acm)
1863                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1864                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1865                                 uapsd = true;
1866                         break;
1867                 case 0: /* AC_BE */
1868                 default:
1869                         ac = IEEE80211_AC_BE;
1870                         if (acm)
1871                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1872                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1873                                 uapsd = true;
1874                         break;
1875                 }
1876
1877                 params[ac].aifs = pos[0] & 0x0f;
1878
1879                 if (params[ac].aifs < 2) {
1880                         sdata_info(sdata,
1881                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1882                                    params[ac].aifs, aci);
1883                         params[ac].aifs = 2;
1884                 }
1885                 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1886                 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1887                 params[ac].txop = get_unaligned_le16(pos + 2);
1888                 params[ac].acm = acm;
1889                 params[ac].uapsd = uapsd;
1890
1891                 if (params[ac].cw_min == 0 ||
1892                     params[ac].cw_min > params[ac].cw_max) {
1893                         sdata_info(sdata,
1894                                    "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1895                                    params[ac].cw_min, params[ac].cw_max, aci);
1896                         return false;
1897                 }
1898         }
1899
1900         /* WMM specification requires all 4 ACIs. */
1901         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1902                 if (params[ac].cw_min == 0) {
1903                         sdata_info(sdata,
1904                                    "AP has invalid WMM params (missing AC %d), using defaults\n",
1905                                    ac);
1906                         return false;
1907                 }
1908         }
1909
1910         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1911                 mlme_dbg(sdata,
1912                          "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1913                          ac, params[ac].acm,
1914                          params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1915                          params[ac].txop, params[ac].uapsd,
1916                          ifmgd->tx_tspec[ac].downgraded);
1917                 sdata->tx_conf[ac] = params[ac];
1918                 if (!ifmgd->tx_tspec[ac].downgraded &&
1919                     drv_conf_tx(local, sdata, ac, &params[ac]))
1920                         sdata_err(sdata,
1921                                   "failed to set TX queue parameters for AC %d\n",
1922                                   ac);
1923         }
1924
1925         /* enable WMM or activate new settings */
1926         sdata->vif.bss_conf.qos = true;
1927         return true;
1928 }
1929
1930 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1931 {
1932         lockdep_assert_held(&sdata->local->mtx);
1933
1934         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1935         ieee80211_run_deferred_scan(sdata->local);
1936 }
1937
1938 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1939 {
1940         mutex_lock(&sdata->local->mtx);
1941         __ieee80211_stop_poll(sdata);
1942         mutex_unlock(&sdata->local->mtx);
1943 }
1944
1945 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1946                                            u16 capab, bool erp_valid, u8 erp)
1947 {
1948         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1949         u32 changed = 0;
1950         bool use_protection;
1951         bool use_short_preamble;
1952         bool use_short_slot;
1953
1954         if (erp_valid) {
1955                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1956                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1957         } else {
1958                 use_protection = false;
1959                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1960         }
1961
1962         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1963         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1964                 use_short_slot = true;
1965
1966         if (use_protection != bss_conf->use_cts_prot) {
1967                 bss_conf->use_cts_prot = use_protection;
1968                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1969         }
1970
1971         if (use_short_preamble != bss_conf->use_short_preamble) {
1972                 bss_conf->use_short_preamble = use_short_preamble;
1973                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1974         }
1975
1976         if (use_short_slot != bss_conf->use_short_slot) {
1977                 bss_conf->use_short_slot = use_short_slot;
1978                 changed |= BSS_CHANGED_ERP_SLOT;
1979         }
1980
1981         return changed;
1982 }
1983
1984 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1985                                      struct cfg80211_bss *cbss,
1986                                      u32 bss_info_changed)
1987 {
1988         struct ieee80211_bss *bss = (void *)cbss->priv;
1989         struct ieee80211_local *local = sdata->local;
1990         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1991
1992         bss_info_changed |= BSS_CHANGED_ASSOC;
1993         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1994                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1995
1996         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1997                 beacon_loss_count * bss_conf->beacon_int));
1998
1999         sdata->u.mgd.associated = cbss;
2000         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
2001
2002         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
2003
2004         if (sdata->vif.p2p) {
2005                 const struct cfg80211_bss_ies *ies;
2006
2007                 rcu_read_lock();
2008                 ies = rcu_dereference(cbss->ies);
2009                 if (ies) {
2010                         int ret;
2011
2012                         ret = cfg80211_get_p2p_attr(
2013                                         ies->data, ies->len,
2014                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2015                                         (u8 *) &bss_conf->p2p_noa_attr,
2016                                         sizeof(bss_conf->p2p_noa_attr));
2017                         if (ret >= 2) {
2018                                 sdata->u.mgd.p2p_noa_index =
2019                                         bss_conf->p2p_noa_attr.index;
2020                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
2021                         }
2022                 }
2023                 rcu_read_unlock();
2024         }
2025
2026         /* just to be sure */
2027         ieee80211_stop_poll(sdata);
2028
2029         ieee80211_led_assoc(local, 1);
2030
2031         if (sdata->u.mgd.have_beacon) {
2032                 /*
2033                  * If the AP is buggy we may get here with no DTIM period
2034                  * known, so assume it's 1 which is the only safe assumption
2035                  * in that case, although if the TIM IE is broken powersave
2036                  * probably just won't work at all.
2037                  */
2038                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
2039                 bss_conf->beacon_rate = bss->beacon_rate;
2040                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
2041         } else {
2042                 bss_conf->beacon_rate = NULL;
2043                 bss_conf->dtim_period = 0;
2044         }
2045
2046         bss_conf->assoc = 1;
2047
2048         /* Tell the driver to monitor connection quality (if supported) */
2049         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
2050             bss_conf->cqm_rssi_thold)
2051                 bss_info_changed |= BSS_CHANGED_CQM;
2052
2053         /* Enable ARP filtering */
2054         if (bss_conf->arp_addr_cnt)
2055                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
2056
2057         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
2058
2059         mutex_lock(&local->iflist_mtx);
2060         ieee80211_recalc_ps(local);
2061         mutex_unlock(&local->iflist_mtx);
2062
2063         ieee80211_recalc_smps(sdata);
2064         ieee80211_recalc_ps_vif(sdata);
2065
2066         netif_carrier_on(sdata->dev);
2067 }
2068
2069 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2070                                    u16 stype, u16 reason, bool tx,
2071                                    u8 *frame_buf)
2072 {
2073         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2074         struct ieee80211_local *local = sdata->local;
2075         u32 changed = 0;
2076
2077         sdata_assert_lock(sdata);
2078
2079         if (WARN_ON_ONCE(tx && !frame_buf))
2080                 return;
2081
2082         if (WARN_ON(!ifmgd->associated))
2083                 return;
2084
2085         ieee80211_stop_poll(sdata);
2086
2087         ifmgd->associated = NULL;
2088         netif_carrier_off(sdata->dev);
2089
2090         /*
2091          * if we want to get out of ps before disassoc (why?) we have
2092          * to do it before sending disassoc, as otherwise the null-packet
2093          * won't be valid.
2094          */
2095         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2096                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2097                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2098         }
2099         local->ps_sdata = NULL;
2100
2101         /* disable per-vif ps */
2102         ieee80211_recalc_ps_vif(sdata);
2103
2104         /* make sure ongoing transmission finishes */
2105         synchronize_net();
2106
2107         /*
2108          * drop any frame before deauth/disassoc, this can be data or
2109          * management frame. Since we are disconnecting, we should not
2110          * insist sending these frames which can take time and delay
2111          * the disconnection and possible the roaming.
2112          */
2113         if (tx)
2114                 ieee80211_flush_queues(local, sdata, true);
2115
2116         /* deauthenticate/disassociate now */
2117         if (tx || frame_buf)
2118                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2119                                                reason, tx, frame_buf);
2120
2121         /* flush out frame - make sure the deauth was actually sent */
2122         if (tx)
2123                 ieee80211_flush_queues(local, sdata, false);
2124
2125         /* clear bssid only after building the needed mgmt frames */
2126         eth_zero_addr(ifmgd->bssid);
2127
2128         /* remove AP and TDLS peers */
2129         sta_info_flush(sdata);
2130
2131         /* finally reset all BSS / config parameters */
2132         changed |= ieee80211_reset_erp_info(sdata);
2133
2134         ieee80211_led_assoc(local, 0);
2135         changed |= BSS_CHANGED_ASSOC;
2136         sdata->vif.bss_conf.assoc = false;
2137
2138         ifmgd->p2p_noa_index = -1;
2139         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2140                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2141
2142         /* on the next assoc, re-program HT/VHT parameters */
2143         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2144         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2145         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2146         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2147         sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2148
2149         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2150
2151         del_timer_sync(&local->dynamic_ps_timer);
2152         cancel_work_sync(&local->dynamic_ps_enable_work);
2153
2154         /* Disable ARP filtering */
2155         if (sdata->vif.bss_conf.arp_addr_cnt)
2156                 changed |= BSS_CHANGED_ARP_FILTER;
2157
2158         sdata->vif.bss_conf.qos = false;
2159         changed |= BSS_CHANGED_QOS;
2160
2161         /* The BSSID (not really interesting) and HT changed */
2162         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2163         ieee80211_bss_info_change_notify(sdata, changed);
2164
2165         /* disassociated - set to defaults now */
2166         ieee80211_set_wmm_default(sdata, false, false);
2167
2168         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2169         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2170         del_timer_sync(&sdata->u.mgd.timer);
2171         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2172
2173         sdata->vif.bss_conf.dtim_period = 0;
2174         sdata->vif.bss_conf.beacon_rate = NULL;
2175
2176         ifmgd->have_beacon = false;
2177
2178         ifmgd->flags = 0;
2179         mutex_lock(&local->mtx);
2180         ieee80211_vif_release_channel(sdata);
2181
2182         sdata->vif.csa_active = false;
2183         ifmgd->csa_waiting_bcn = false;
2184         ifmgd->csa_ignored_same_chan = false;
2185         if (sdata->csa_block_tx) {
2186                 ieee80211_wake_vif_queues(local, sdata,
2187                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2188                 sdata->csa_block_tx = false;
2189         }
2190         mutex_unlock(&local->mtx);
2191
2192         /* existing TX TSPEC sessions no longer exist */
2193         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2194         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2195
2196         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2197 }
2198
2199 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2200                              struct ieee80211_hdr *hdr)
2201 {
2202         /*
2203          * We can postpone the mgd.timer whenever receiving unicast frames
2204          * from AP because we know that the connection is working both ways
2205          * at that time. But multicast frames (and hence also beacons) must
2206          * be ignored here, because we need to trigger the timer during
2207          * data idle periods for sending the periodic probe request to the
2208          * AP we're connected to.
2209          */
2210         if (is_multicast_ether_addr(hdr->addr1))
2211                 return;
2212
2213         ieee80211_sta_reset_conn_monitor(sdata);
2214 }
2215
2216 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2217 {
2218         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2219         struct ieee80211_local *local = sdata->local;
2220
2221         mutex_lock(&local->mtx);
2222         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2223                 goto out;
2224
2225         __ieee80211_stop_poll(sdata);
2226
2227         mutex_lock(&local->iflist_mtx);
2228         ieee80211_recalc_ps(local);
2229         mutex_unlock(&local->iflist_mtx);
2230
2231         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2232                 goto out;
2233
2234         /*
2235          * We've received a probe response, but are not sure whether
2236          * we have or will be receiving any beacons or data, so let's
2237          * schedule the timers again, just in case.
2238          */
2239         ieee80211_sta_reset_beacon_monitor(sdata);
2240
2241         mod_timer(&ifmgd->conn_mon_timer,
2242                   round_jiffies_up(jiffies +
2243                                    IEEE80211_CONNECTION_IDLE_TIME));
2244 out:
2245         mutex_unlock(&local->mtx);
2246 }
2247
2248 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2249                                            struct ieee80211_hdr *hdr,
2250                                            u16 tx_time)
2251 {
2252         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2253         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2254         int ac = ieee80211_ac_from_tid(tid);
2255         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2256         unsigned long now = jiffies;
2257
2258         if (likely(!tx_tspec->admitted_time))
2259                 return;
2260
2261         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2262                 tx_tspec->consumed_tx_time = 0;
2263                 tx_tspec->time_slice_start = now;
2264
2265                 if (tx_tspec->downgraded) {
2266                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2267                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2268                 }
2269         }
2270
2271         if (tx_tspec->downgraded)
2272                 return;
2273
2274         tx_tspec->consumed_tx_time += tx_time;
2275
2276         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2277                 tx_tspec->downgraded = true;
2278                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2279                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2280         }
2281 }
2282
2283 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2284                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2285 {
2286         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2287
2288         if (!ieee80211_is_data(hdr->frame_control))
2289             return;
2290
2291         if (ieee80211_is_any_nullfunc(hdr->frame_control) &&
2292             sdata->u.mgd.probe_send_count > 0) {
2293                 if (ack)
2294                         ieee80211_sta_reset_conn_monitor(sdata);
2295                 else
2296                         sdata->u.mgd.nullfunc_failed = true;
2297                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2298                 return;
2299         }
2300
2301         if (ack)
2302                 ieee80211_sta_reset_conn_monitor(sdata);
2303 }
2304
2305 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2306 {
2307         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2308         const u8 *ssid;
2309         u8 *dst = ifmgd->associated->bssid;
2310         u8 unicast_limit = max(1, max_probe_tries - 3);
2311
2312         /*
2313          * Try sending broadcast probe requests for the last three
2314          * probe requests after the first ones failed since some
2315          * buggy APs only support broadcast probe requests.
2316          */
2317         if (ifmgd->probe_send_count >= unicast_limit)
2318                 dst = NULL;
2319
2320         /*
2321          * When the hardware reports an accurate Tx ACK status, it's
2322          * better to send a nullfunc frame instead of a probe request,
2323          * as it will kick us off the AP quickly if we aren't associated
2324          * anymore. The timeout will be reset if the frame is ACKed by
2325          * the AP.
2326          */
2327         ifmgd->probe_send_count++;
2328
2329         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2330                 ifmgd->nullfunc_failed = false;
2331                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2332         } else {
2333                 int ssid_len;
2334
2335                 rcu_read_lock();
2336                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2337                 if (WARN_ON_ONCE(ssid == NULL))
2338                         ssid_len = 0;
2339                 else
2340                         ssid_len = ssid[1];
2341
2342                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2343                                          ssid + 2, ssid_len, NULL,
2344                                          0, (u32) -1, true, 0,
2345                                          ifmgd->associated->channel, false);
2346                 rcu_read_unlock();
2347         }
2348
2349         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2350         run_again(sdata, ifmgd->probe_timeout);
2351 }
2352
2353 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2354                                    bool beacon)
2355 {
2356         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2357         bool already = false;
2358
2359         if (!ieee80211_sdata_running(sdata))
2360                 return;
2361
2362         sdata_lock(sdata);
2363
2364         if (!ifmgd->associated)
2365                 goto out;
2366
2367         mutex_lock(&sdata->local->mtx);
2368
2369         if (sdata->local->tmp_channel || sdata->local->scanning) {
2370                 mutex_unlock(&sdata->local->mtx);
2371                 goto out;
2372         }
2373
2374         if (beacon) {
2375                 mlme_dbg_ratelimited(sdata,
2376                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2377                                      beacon_loss_count);
2378
2379                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2380         }
2381
2382         /*
2383          * The driver/our work has already reported this event or the
2384          * connection monitoring has kicked in and we have already sent
2385          * a probe request. Or maybe the AP died and the driver keeps
2386          * reporting until we disassociate...
2387          *
2388          * In either case we have to ignore the current call to this
2389          * function (except for setting the correct probe reason bit)
2390          * because otherwise we would reset the timer every time and
2391          * never check whether we received a probe response!
2392          */
2393         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2394                 already = true;
2395
2396         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2397
2398         mutex_unlock(&sdata->local->mtx);
2399
2400         if (already)
2401                 goto out;
2402
2403         mutex_lock(&sdata->local->iflist_mtx);
2404         ieee80211_recalc_ps(sdata->local);
2405         mutex_unlock(&sdata->local->iflist_mtx);
2406
2407         ifmgd->probe_send_count = 0;
2408         ieee80211_mgd_probe_ap_send(sdata);
2409  out:
2410         sdata_unlock(sdata);
2411 }
2412
2413 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2414                                           struct ieee80211_vif *vif)
2415 {
2416         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2417         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2418         struct cfg80211_bss *cbss;
2419         struct sk_buff *skb;
2420         const u8 *ssid;
2421         int ssid_len;
2422
2423         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2424                 return NULL;
2425
2426         sdata_assert_lock(sdata);
2427
2428         if (ifmgd->associated)
2429                 cbss = ifmgd->associated;
2430         else if (ifmgd->auth_data)
2431                 cbss = ifmgd->auth_data->bss;
2432         else if (ifmgd->assoc_data)
2433                 cbss = ifmgd->assoc_data->bss;
2434         else
2435                 return NULL;
2436
2437         rcu_read_lock();
2438         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2439         if (WARN_ONCE(!ssid || ssid[1] > IEEE80211_MAX_SSID_LEN,
2440                       "invalid SSID element (len=%d)", ssid ? ssid[1] : -1))
2441                 ssid_len = 0;
2442         else
2443                 ssid_len = ssid[1];
2444
2445         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2446                                         (u32) -1, cbss->channel,
2447                                         ssid + 2, ssid_len,
2448                                         NULL, 0, true);
2449         rcu_read_unlock();
2450
2451         return skb;
2452 }
2453 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2454
2455 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2456                                         const u8 *buf, size_t len, bool tx,
2457                                         u16 reason)
2458 {
2459         struct ieee80211_event event = {
2460                 .type = MLME_EVENT,
2461                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2462                 .u.mlme.reason = reason,
2463         };
2464
2465         if (tx)
2466                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2467         else
2468                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2469
2470         drv_event_callback(sdata->local, sdata, &event);
2471 }
2472
2473 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2474 {
2475         struct ieee80211_local *local = sdata->local;
2476         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2477         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2478
2479         sdata_lock(sdata);
2480         if (!ifmgd->associated) {
2481                 sdata_unlock(sdata);
2482                 return;
2483         }
2484
2485         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2486                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2487                                true, frame_buf);
2488         mutex_lock(&local->mtx);
2489         sdata->vif.csa_active = false;
2490         ifmgd->csa_waiting_bcn = false;
2491         if (sdata->csa_block_tx) {
2492                 ieee80211_wake_vif_queues(local, sdata,
2493                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2494                 sdata->csa_block_tx = false;
2495         }
2496         mutex_unlock(&local->mtx);
2497
2498         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2499                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2500
2501         sdata_unlock(sdata);
2502 }
2503
2504 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2505 {
2506         struct ieee80211_sub_if_data *sdata =
2507                 container_of(work, struct ieee80211_sub_if_data,
2508                              u.mgd.beacon_connection_loss_work);
2509         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2510
2511         if (ifmgd->associated)
2512                 ifmgd->beacon_loss_count++;
2513
2514         if (ifmgd->connection_loss) {
2515                 sdata_info(sdata, "Connection to AP %pM lost\n",
2516                            ifmgd->bssid);
2517                 __ieee80211_disconnect(sdata);
2518         } else {
2519                 ieee80211_mgd_probe_ap(sdata, true);
2520         }
2521 }
2522
2523 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2524 {
2525         struct ieee80211_sub_if_data *sdata =
2526                 container_of(work, struct ieee80211_sub_if_data,
2527                              u.mgd.csa_connection_drop_work);
2528
2529         __ieee80211_disconnect(sdata);
2530 }
2531
2532 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2533 {
2534         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2535         struct ieee80211_hw *hw = &sdata->local->hw;
2536
2537         trace_api_beacon_loss(sdata);
2538
2539         sdata->u.mgd.connection_loss = false;
2540         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2541 }
2542 EXPORT_SYMBOL(ieee80211_beacon_loss);
2543
2544 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2545 {
2546         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2547         struct ieee80211_hw *hw = &sdata->local->hw;
2548
2549         trace_api_connection_loss(sdata);
2550
2551         sdata->u.mgd.connection_loss = true;
2552         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2553 }
2554 EXPORT_SYMBOL(ieee80211_connection_loss);
2555
2556
2557 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2558                                         bool assoc)
2559 {
2560         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2561
2562         sdata_assert_lock(sdata);
2563
2564         if (!assoc) {
2565                 /*
2566                  * we are not authenticated yet, the only timer that could be
2567                  * running is the timeout for the authentication response which
2568                  * which is not relevant anymore.
2569                  */
2570                 del_timer_sync(&sdata->u.mgd.timer);
2571                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2572
2573                 eth_zero_addr(sdata->u.mgd.bssid);
2574                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2575                 sdata->u.mgd.flags = 0;
2576                 mutex_lock(&sdata->local->mtx);
2577                 ieee80211_vif_release_channel(sdata);
2578                 mutex_unlock(&sdata->local->mtx);
2579         }
2580
2581         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2582         kfree(auth_data);
2583         sdata->u.mgd.auth_data = NULL;
2584 }
2585
2586 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2587                                          bool assoc, bool abandon)
2588 {
2589         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2590
2591         sdata_assert_lock(sdata);
2592
2593         if (!assoc) {
2594                 /*
2595                  * we are not associated yet, the only timer that could be
2596                  * running is the timeout for the association response which
2597                  * which is not relevant anymore.
2598                  */
2599                 del_timer_sync(&sdata->u.mgd.timer);
2600                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2601
2602                 eth_zero_addr(sdata->u.mgd.bssid);
2603                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2604                 sdata->u.mgd.flags = 0;
2605                 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2606                 mutex_lock(&sdata->local->mtx);
2607                 ieee80211_vif_release_channel(sdata);
2608                 mutex_unlock(&sdata->local->mtx);
2609
2610                 if (abandon)
2611                         cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2612         }
2613
2614         kfree(assoc_data);
2615         sdata->u.mgd.assoc_data = NULL;
2616 }
2617
2618 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2619                                      struct ieee80211_mgmt *mgmt, size_t len)
2620 {
2621         struct ieee80211_local *local = sdata->local;
2622         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2623         u8 *pos;
2624         struct ieee802_11_elems elems;
2625         u32 tx_flags = 0;
2626
2627         pos = mgmt->u.auth.variable;
2628         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2629         if (!elems.challenge)
2630                 return;
2631         auth_data->expected_transaction = 4;
2632         drv_mgd_prepare_tx(sdata->local, sdata);
2633         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2634                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2635                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2636         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2637                             elems.challenge - 2, elems.challenge_len + 2,
2638                             auth_data->bss->bssid, auth_data->bss->bssid,
2639                             auth_data->key, auth_data->key_len,
2640                             auth_data->key_idx, tx_flags);
2641 }
2642
2643 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2644                                    struct ieee80211_mgmt *mgmt, size_t len)
2645 {
2646         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2647         u8 bssid[ETH_ALEN];
2648         u16 auth_alg, auth_transaction, status_code;
2649         struct sta_info *sta;
2650         struct ieee80211_event event = {
2651                 .type = MLME_EVENT,
2652                 .u.mlme.data = AUTH_EVENT,
2653         };
2654
2655         sdata_assert_lock(sdata);
2656
2657         if (len < 24 + 6)
2658                 return;
2659
2660         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2661                 return;
2662
2663         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2664
2665         if (!ether_addr_equal(bssid, mgmt->bssid))
2666                 return;
2667
2668         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2669         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2670         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2671
2672         if (auth_alg != ifmgd->auth_data->algorithm ||
2673             auth_transaction != ifmgd->auth_data->expected_transaction) {
2674                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2675                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2676                            auth_transaction,
2677                            ifmgd->auth_data->expected_transaction);
2678                 return;
2679         }
2680
2681         if (status_code != WLAN_STATUS_SUCCESS) {
2682                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2683                            mgmt->sa, status_code);
2684                 ieee80211_destroy_auth_data(sdata, false);
2685                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2686                 event.u.mlme.status = MLME_DENIED;
2687                 event.u.mlme.reason = status_code;
2688                 drv_event_callback(sdata->local, sdata, &event);
2689                 return;
2690         }
2691
2692         switch (ifmgd->auth_data->algorithm) {
2693         case WLAN_AUTH_OPEN:
2694         case WLAN_AUTH_LEAP:
2695         case WLAN_AUTH_FT:
2696         case WLAN_AUTH_SAE:
2697                 break;
2698         case WLAN_AUTH_SHARED_KEY:
2699                 if (ifmgd->auth_data->expected_transaction != 4) {
2700                         ieee80211_auth_challenge(sdata, mgmt, len);
2701                         /* need another frame */
2702                         return;
2703                 }
2704                 break;
2705         default:
2706                 WARN_ONCE(1, "invalid auth alg %d",
2707                           ifmgd->auth_data->algorithm);
2708                 return;
2709         }
2710
2711         event.u.mlme.status = MLME_SUCCESS;
2712         drv_event_callback(sdata->local, sdata, &event);
2713         sdata_info(sdata, "authenticated\n");
2714         ifmgd->auth_data->done = true;
2715         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2716         ifmgd->auth_data->timeout_started = true;
2717         run_again(sdata, ifmgd->auth_data->timeout);
2718
2719         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2720             ifmgd->auth_data->expected_transaction != 2) {
2721                 /*
2722                  * Report auth frame to user space for processing since another
2723                  * round of Authentication frames is still needed.
2724                  */
2725                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2726                 return;
2727         }
2728
2729         /* move station state to auth */
2730         mutex_lock(&sdata->local->sta_mtx);
2731         sta = sta_info_get(sdata, bssid);
2732         if (!sta) {
2733                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2734                 goto out_err;
2735         }
2736         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2737                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2738                 goto out_err;
2739         }
2740         mutex_unlock(&sdata->local->sta_mtx);
2741
2742         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2743         return;
2744  out_err:
2745         mutex_unlock(&sdata->local->sta_mtx);
2746         /* ignore frame -- wait for timeout */
2747 }
2748
2749 #define case_WLAN(type) \
2750         case WLAN_REASON_##type: return #type
2751
2752 const char *ieee80211_get_reason_code_string(u16 reason_code)
2753 {
2754         switch (reason_code) {
2755         case_WLAN(UNSPECIFIED);
2756         case_WLAN(PREV_AUTH_NOT_VALID);
2757         case_WLAN(DEAUTH_LEAVING);
2758         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2759         case_WLAN(DISASSOC_AP_BUSY);
2760         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2761         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2762         case_WLAN(DISASSOC_STA_HAS_LEFT);
2763         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2764         case_WLAN(DISASSOC_BAD_POWER);
2765         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2766         case_WLAN(INVALID_IE);
2767         case_WLAN(MIC_FAILURE);
2768         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2769         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2770         case_WLAN(IE_DIFFERENT);
2771         case_WLAN(INVALID_GROUP_CIPHER);
2772         case_WLAN(INVALID_PAIRWISE_CIPHER);
2773         case_WLAN(INVALID_AKMP);
2774         case_WLAN(UNSUPP_RSN_VERSION);
2775         case_WLAN(INVALID_RSN_IE_CAP);
2776         case_WLAN(IEEE8021X_FAILED);
2777         case_WLAN(CIPHER_SUITE_REJECTED);
2778         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2779         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2780         case_WLAN(DISASSOC_LOW_ACK);
2781         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2782         case_WLAN(QSTA_LEAVE_QBSS);
2783         case_WLAN(QSTA_NOT_USE);
2784         case_WLAN(QSTA_REQUIRE_SETUP);
2785         case_WLAN(QSTA_TIMEOUT);
2786         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2787         case_WLAN(MESH_PEER_CANCELED);
2788         case_WLAN(MESH_MAX_PEERS);
2789         case_WLAN(MESH_CONFIG);
2790         case_WLAN(MESH_CLOSE);
2791         case_WLAN(MESH_MAX_RETRIES);
2792         case_WLAN(MESH_CONFIRM_TIMEOUT);
2793         case_WLAN(MESH_INVALID_GTK);
2794         case_WLAN(MESH_INCONSISTENT_PARAM);
2795         case_WLAN(MESH_INVALID_SECURITY);
2796         case_WLAN(MESH_PATH_ERROR);
2797         case_WLAN(MESH_PATH_NOFORWARD);
2798         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2799         case_WLAN(MAC_EXISTS_IN_MBSS);
2800         case_WLAN(MESH_CHAN_REGULATORY);
2801         case_WLAN(MESH_CHAN);
2802         default: return "<unknown>";
2803         }
2804 }
2805
2806 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2807                                      struct ieee80211_mgmt *mgmt, size_t len)
2808 {
2809         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2810         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2811
2812         sdata_assert_lock(sdata);
2813
2814         if (len < 24 + 2)
2815                 return;
2816
2817         if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) {
2818                 ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code);
2819                 return;
2820         }
2821
2822         if (ifmgd->associated &&
2823             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2824                 const u8 *bssid = ifmgd->associated->bssid;
2825
2826                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2827                            bssid, reason_code,
2828                            ieee80211_get_reason_code_string(reason_code));
2829
2830                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2831
2832                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2833                                             reason_code);
2834                 return;
2835         }
2836
2837         if (ifmgd->assoc_data &&
2838             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2839                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2840
2841                 sdata_info(sdata,
2842                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2843                            bssid, reason_code,
2844                            ieee80211_get_reason_code_string(reason_code));
2845
2846                 ieee80211_destroy_assoc_data(sdata, false, true);
2847
2848                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2849                 return;
2850         }
2851 }
2852
2853
2854 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2855                                        struct ieee80211_mgmt *mgmt, size_t len)
2856 {
2857         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2858         u16 reason_code;
2859
2860         sdata_assert_lock(sdata);
2861
2862         if (len < 24 + 2)
2863                 return;
2864
2865         if (!ifmgd->associated ||
2866             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2867                 return;
2868
2869         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2870
2871         if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) {
2872                 ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code);
2873                 return;
2874         }
2875
2876         sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
2877                    mgmt->sa, reason_code,
2878                    ieee80211_get_reason_code_string(reason_code));
2879
2880         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2881
2882         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2883 }
2884
2885 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2886                                 u8 *supp_rates, unsigned int supp_rates_len,
2887                                 u32 *rates, u32 *basic_rates,
2888                                 bool *have_higher_than_11mbit,
2889                                 int *min_rate, int *min_rate_index,
2890                                 int shift, u32 rate_flags)
2891 {
2892         int i, j;
2893
2894         for (i = 0; i < supp_rates_len; i++) {
2895                 int rate = supp_rates[i] & 0x7f;
2896                 bool is_basic = !!(supp_rates[i] & 0x80);
2897
2898                 if ((rate * 5 * (1 << shift)) > 110)
2899                         *have_higher_than_11mbit = true;
2900
2901                 /*
2902                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2903                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2904                  *
2905                  * Note: Even through the membership selector and the basic
2906                  *       rate flag share the same bit, they are not exactly
2907                  *       the same.
2908                  */
2909                 if (!!(supp_rates[i] & 0x80) &&
2910                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2911                         continue;
2912
2913                 for (j = 0; j < sband->n_bitrates; j++) {
2914                         struct ieee80211_rate *br;
2915                         int brate;
2916
2917                         br = &sband->bitrates[j];
2918                         if ((rate_flags & br->flags) != rate_flags)
2919                                 continue;
2920
2921                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2922                         if (brate == rate) {
2923                                 *rates |= BIT(j);
2924                                 if (is_basic)
2925                                         *basic_rates |= BIT(j);
2926                                 if ((rate * 5) < *min_rate) {
2927                                         *min_rate = rate * 5;
2928                                         *min_rate_index = j;
2929                                 }
2930                                 break;
2931                         }
2932                 }
2933         }
2934 }
2935
2936 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2937                                     struct cfg80211_bss *cbss,
2938                                     struct ieee80211_mgmt *mgmt, size_t len)
2939 {
2940         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2941         struct ieee80211_local *local = sdata->local;
2942         struct ieee80211_supported_band *sband;
2943         struct sta_info *sta;
2944         u8 *pos;
2945         u16 capab_info, aid;
2946         struct ieee802_11_elems elems;
2947         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2948         const struct cfg80211_bss_ies *bss_ies = NULL;
2949         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2950         u32 changed = 0;
2951         int err;
2952         bool ret;
2953
2954         /* AssocResp and ReassocResp have identical structure */
2955
2956         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2957         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2958
2959         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2960                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2961                            aid);
2962         aid &= ~(BIT(15) | BIT(14));
2963
2964         ifmgd->broken_ap = false;
2965
2966         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2967                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2968                            aid);
2969                 aid = 0;
2970                 ifmgd->broken_ap = true;
2971         }
2972
2973         pos = mgmt->u.assoc_resp.variable;
2974         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2975
2976         if (!elems.supp_rates) {
2977                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2978                 return false;
2979         }
2980
2981         ifmgd->aid = aid;
2982         ifmgd->tdls_chan_switch_prohibited =
2983                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2984                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2985
2986         /*
2987          * Some APs are erroneously not including some information in their
2988          * (re)association response frames. Try to recover by using the data
2989          * from the beacon or probe response. This seems to afflict mobile
2990          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2991          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2992          */
2993         if ((assoc_data->wmm && !elems.wmm_param) ||
2994             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2995              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2996             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2997              (!elems.vht_cap_elem || !elems.vht_operation))) {
2998                 const struct cfg80211_bss_ies *ies;
2999                 struct ieee802_11_elems bss_elems;
3000
3001                 rcu_read_lock();
3002                 ies = rcu_dereference(cbss->ies);
3003                 if (ies)
3004                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
3005                                           GFP_ATOMIC);
3006                 rcu_read_unlock();
3007                 if (!bss_ies)
3008                         return false;
3009
3010                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
3011                                        false, &bss_elems);
3012                 if (assoc_data->wmm &&
3013                     !elems.wmm_param && bss_elems.wmm_param) {
3014                         elems.wmm_param = bss_elems.wmm_param;
3015                         sdata_info(sdata,
3016                                    "AP bug: WMM param missing from AssocResp\n");
3017                 }
3018
3019                 /*
3020                  * Also check if we requested HT/VHT, otherwise the AP doesn't
3021                  * have to include the IEs in the (re)association response.
3022                  */
3023                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
3024                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
3025                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
3026                         sdata_info(sdata,
3027                                    "AP bug: HT capability missing from AssocResp\n");
3028                 }
3029                 if (!elems.ht_operation && bss_elems.ht_operation &&
3030                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
3031                         elems.ht_operation = bss_elems.ht_operation;
3032                         sdata_info(sdata,
3033                                    "AP bug: HT operation missing from AssocResp\n");
3034                 }
3035                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
3036                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
3037                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
3038                         sdata_info(sdata,
3039                                    "AP bug: VHT capa missing from AssocResp\n");
3040                 }
3041                 if (!elems.vht_operation && bss_elems.vht_operation &&
3042                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
3043                         elems.vht_operation = bss_elems.vht_operation;
3044                         sdata_info(sdata,
3045                                    "AP bug: VHT operation missing from AssocResp\n");
3046                 }
3047         }
3048
3049         /*
3050          * We previously checked these in the beacon/probe response, so
3051          * they should be present here. This is just a safety net.
3052          */
3053         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3054             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
3055                 sdata_info(sdata,
3056                            "HT AP is missing WMM params or HT capability/operation\n");
3057                 ret = false;
3058                 goto out;
3059         }
3060
3061         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3062             (!elems.vht_cap_elem || !elems.vht_operation)) {
3063                 sdata_info(sdata,
3064                            "VHT AP is missing VHT capability/operation\n");
3065                 ret = false;
3066                 goto out;
3067         }
3068
3069         mutex_lock(&sdata->local->sta_mtx);
3070         /*
3071          * station info was already allocated and inserted before
3072          * the association and should be available to us
3073          */
3074         sta = sta_info_get(sdata, cbss->bssid);
3075         if (WARN_ON(!sta)) {
3076                 mutex_unlock(&sdata->local->sta_mtx);
3077                 ret = false;
3078                 goto out;
3079         }
3080
3081         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
3082
3083         /* Set up internal HT/VHT capabilities */
3084         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3085                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3086                                                   elems.ht_cap_elem, sta);
3087
3088         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3089                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3090                                                     elems.vht_cap_elem, sta);
3091
3092         /*
3093          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3094          * in their association response, so ignore that data for our own
3095          * configuration. If it changed since the last beacon, we'll get the
3096          * next beacon and update then.
3097          */
3098
3099         /*
3100          * If an operating mode notification IE is present, override the
3101          * NSS calculation (that would be done in rate_control_rate_init())
3102          * and use the # of streams from that element.
3103          */
3104         if (elems.opmode_notif &&
3105             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3106                 u8 nss;
3107
3108                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3109                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3110                 nss += 1;
3111                 sta->sta.rx_nss = nss;
3112         }
3113
3114         rate_control_rate_init(sta);
3115
3116         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3117                 set_sta_flag(sta, WLAN_STA_MFP);
3118                 sta->sta.mfp = true;
3119         } else {
3120                 sta->sta.mfp = false;
3121         }
3122
3123         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3124
3125         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3126         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3127                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3128         if (err) {
3129                 sdata_info(sdata,
3130                            "failed to move station %pM to desired state\n",
3131                            sta->sta.addr);
3132                 WARN_ON(__sta_info_destroy(sta));
3133                 mutex_unlock(&sdata->local->sta_mtx);
3134                 ret = false;
3135                 goto out;
3136         }
3137
3138         mutex_unlock(&sdata->local->sta_mtx);
3139
3140         /*
3141          * Always handle WMM once after association regardless
3142          * of the first value the AP uses. Setting -1 here has
3143          * that effect because the AP values is an unsigned
3144          * 4-bit value.
3145          */
3146         ifmgd->wmm_last_param_set = -1;
3147
3148         if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3149                 ieee80211_set_wmm_default(sdata, false, false);
3150         } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3151                                              elems.wmm_param_len)) {
3152                 /* still enable QoS since we might have HT/VHT */
3153                 ieee80211_set_wmm_default(sdata, false, true);
3154                 /* set the disable-WMM flag in this case to disable
3155                  * tracking WMM parameter changes in the beacon if
3156                  * the parameters weren't actually valid. Doing so
3157                  * avoids changing parameters very strangely when
3158                  * the AP is going back and forth between valid and
3159                  * invalid parameters.
3160                  */
3161                 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3162         }
3163         changed |= BSS_CHANGED_QOS;
3164
3165         /* set AID and assoc capability,
3166          * ieee80211_set_associated() will tell the driver */
3167         bss_conf->aid = aid;
3168         bss_conf->assoc_capability = capab_info;
3169         ieee80211_set_associated(sdata, cbss, changed);
3170
3171         /*
3172          * If we're using 4-addr mode, let the AP know that we're
3173          * doing so, so that it can create the STA VLAN on its side
3174          */
3175         if (ifmgd->use_4addr)
3176                 ieee80211_send_4addr_nullfunc(local, sdata);
3177
3178         /*
3179          * Start timer to probe the connection to the AP now.
3180          * Also start the timer that will detect beacon loss.
3181          */
3182         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3183         ieee80211_sta_reset_beacon_monitor(sdata);
3184
3185         ret = true;
3186  out:
3187         kfree(bss_ies);
3188         return ret;
3189 }
3190
3191 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3192                                          struct ieee80211_mgmt *mgmt,
3193                                          size_t len)
3194 {
3195         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3196         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3197         u16 capab_info, status_code, aid;
3198         struct ieee802_11_elems elems;
3199         int ac, uapsd_queues = -1;
3200         u8 *pos;
3201         bool reassoc;
3202         struct cfg80211_bss *bss;
3203         struct ieee80211_event event = {
3204                 .type = MLME_EVENT,
3205                 .u.mlme.data = ASSOC_EVENT,
3206         };
3207
3208         sdata_assert_lock(sdata);
3209
3210         if (!assoc_data)
3211                 return;
3212         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3213                 return;
3214
3215         /*
3216          * AssocResp and ReassocResp have identical structure, so process both
3217          * of them in this function.
3218          */
3219
3220         if (len < 24 + 6)
3221                 return;
3222
3223         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3224         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3225         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3226         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3227
3228         sdata_info(sdata,
3229                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3230                    reassoc ? "Rea" : "A", mgmt->sa,
3231                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3232
3233         pos = mgmt->u.assoc_resp.variable;
3234         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3235
3236         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3237             elems.timeout_int &&
3238             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3239                 u32 tu, ms;
3240                 tu = le32_to_cpu(elems.timeout_int->value);
3241                 ms = tu * 1024 / 1000;
3242                 sdata_info(sdata,
3243                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3244                            mgmt->sa, tu, ms);
3245                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3246                 assoc_data->timeout_started = true;
3247                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3248                         run_again(sdata, assoc_data->timeout);
3249                 return;
3250         }
3251
3252         bss = assoc_data->bss;
3253
3254         if (status_code != WLAN_STATUS_SUCCESS) {
3255                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3256                            mgmt->sa, status_code);
3257                 ieee80211_destroy_assoc_data(sdata, false, false);
3258                 event.u.mlme.status = MLME_DENIED;
3259                 event.u.mlme.reason = status_code;
3260                 drv_event_callback(sdata->local, sdata, &event);
3261         } else {
3262                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3263                         /* oops -- internal error -- send timeout for now */
3264                         ieee80211_destroy_assoc_data(sdata, false, false);
3265                         cfg80211_assoc_timeout(sdata->dev, bss);
3266                         return;
3267                 }
3268                 event.u.mlme.status = MLME_SUCCESS;
3269                 drv_event_callback(sdata->local, sdata, &event);
3270                 sdata_info(sdata, "associated\n");
3271
3272                 /*
3273                  * destroy assoc_data afterwards, as otherwise an idle
3274                  * recalc after assoc_data is NULL but before associated
3275                  * is set can cause the interface to go idle
3276                  */
3277                 ieee80211_destroy_assoc_data(sdata, true, false);
3278
3279                 /* get uapsd queues configuration */
3280                 uapsd_queues = 0;
3281                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3282                         if (sdata->tx_conf[ac].uapsd)
3283                                 uapsd_queues |= BIT(ac);
3284         }
3285
3286         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3287 }
3288
3289 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3290                                   struct ieee80211_mgmt *mgmt, size_t len,
3291                                   struct ieee80211_rx_status *rx_status,
3292                                   struct ieee802_11_elems *elems)
3293 {
3294         struct ieee80211_local *local = sdata->local;
3295         struct ieee80211_bss *bss;
3296         struct ieee80211_channel *channel;
3297
3298         sdata_assert_lock(sdata);
3299
3300         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3301         if (!channel)
3302                 return;
3303
3304         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3305                                         channel);
3306         if (bss) {
3307                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3308                 ieee80211_rx_bss_put(local, bss);
3309         }
3310 }
3311
3312
3313 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3314                                          struct sk_buff *skb)
3315 {
3316         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3317         struct ieee80211_if_managed *ifmgd;
3318         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3319         size_t baselen, len = skb->len;
3320         struct ieee802_11_elems elems;
3321
3322         ifmgd = &sdata->u.mgd;
3323
3324         sdata_assert_lock(sdata);
3325
3326         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3327                 return; /* ignore ProbeResp to foreign address */
3328
3329         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3330         if (baselen > len)
3331                 return;
3332
3333         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3334                                false, &elems);
3335
3336         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3337
3338         if (ifmgd->associated &&
3339             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3340                 ieee80211_reset_ap_probe(sdata);
3341 }
3342
3343 /*
3344  * This is the canonical list of information elements we care about,
3345  * the filter code also gives us all changes to the Microsoft OUI
3346  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3347  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3348  * changes to requested client power.
3349  *
3350  * We implement beacon filtering in software since that means we can
3351  * avoid processing the frame here and in cfg80211, and userspace
3352  * will not be able to tell whether the hardware supports it or not.
3353  *
3354  * XXX: This list needs to be dynamic -- userspace needs to be able to
3355  *      add items it requires. It also needs to be able to tell us to
3356  *      look out for other vendor IEs.
3357  */
3358 static const u64 care_about_ies =
3359         (1ULL << WLAN_EID_COUNTRY) |
3360         (1ULL << WLAN_EID_ERP_INFO) |
3361         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3362         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3363         (1ULL << WLAN_EID_HT_CAPABILITY) |
3364         (1ULL << WLAN_EID_HT_OPERATION) |
3365         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3366
3367 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3368                                      struct ieee80211_mgmt *mgmt, size_t len,
3369                                      struct ieee80211_rx_status *rx_status)
3370 {
3371         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3372         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3373         size_t baselen;
3374         struct ieee802_11_elems elems;
3375         struct ieee80211_local *local = sdata->local;
3376         struct ieee80211_chanctx_conf *chanctx_conf;
3377         struct ieee80211_channel *chan;
3378         struct sta_info *sta;
3379         u32 changed = 0;
3380         bool erp_valid;
3381         u8 erp_value = 0;
3382         u32 ncrc;
3383         u8 *bssid;
3384         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3385
3386         sdata_assert_lock(sdata);
3387
3388         /* Process beacon from the current BSS */
3389         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3390         if (baselen > len)
3391                 return;
3392
3393         rcu_read_lock();
3394         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3395         if (!chanctx_conf) {
3396                 rcu_read_unlock();
3397                 return;
3398         }
3399
3400         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3401                 rcu_read_unlock();
3402                 return;
3403         }
3404         chan = chanctx_conf->def.chan;
3405         rcu_read_unlock();
3406
3407         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3408             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3409                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3410                                        len - baselen, false, &elems);
3411
3412                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3413                 if (elems.tim && !elems.parse_error) {
3414                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3415                         ifmgd->dtim_period = tim_ie->dtim_period;
3416                 }
3417                 ifmgd->have_beacon = true;
3418                 ifmgd->assoc_data->need_beacon = false;
3419                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3420                         sdata->vif.bss_conf.sync_tsf =
3421                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3422                         sdata->vif.bss_conf.sync_device_ts =
3423                                 rx_status->device_timestamp;
3424                         if (elems.tim)
3425                                 sdata->vif.bss_conf.sync_dtim_count =
3426                                         elems.tim->dtim_count;
3427                         else
3428                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3429                 }
3430                 /* continue assoc process */
3431                 ifmgd->assoc_data->timeout = jiffies;
3432                 ifmgd->assoc_data->timeout_started = true;
3433                 run_again(sdata, ifmgd->assoc_data->timeout);
3434                 return;
3435         }
3436
3437         if (!ifmgd->associated ||
3438             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3439                 return;
3440         bssid = ifmgd->associated->bssid;
3441
3442         /* Track average RSSI from the Beacon frames of the current AP */
3443         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3444                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3445                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3446                 ifmgd->last_cqm_event_signal = 0;
3447                 ifmgd->count_beacon_signal = 1;
3448                 ifmgd->last_ave_beacon_signal = 0;
3449         } else {
3450                 ifmgd->count_beacon_signal++;
3451         }
3452
3453         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3454
3455         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3456             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3457                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3458                 int last_sig = ifmgd->last_ave_beacon_signal;
3459                 struct ieee80211_event event = {
3460                         .type = RSSI_EVENT,
3461                 };
3462
3463                 /*
3464                  * if signal crosses either of the boundaries, invoke callback
3465                  * with appropriate parameters
3466                  */
3467                 if (sig > ifmgd->rssi_max_thold &&
3468                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3469                         ifmgd->last_ave_beacon_signal = sig;
3470                         event.u.rssi.data = RSSI_EVENT_HIGH;
3471                         drv_event_callback(local, sdata, &event);
3472                 } else if (sig < ifmgd->rssi_min_thold &&
3473                            (last_sig >= ifmgd->rssi_max_thold ||
3474                            last_sig == 0)) {
3475                         ifmgd->last_ave_beacon_signal = sig;
3476                         event.u.rssi.data = RSSI_EVENT_LOW;
3477                         drv_event_callback(local, sdata, &event);
3478                 }
3479         }
3480
3481         if (bss_conf->cqm_rssi_thold &&
3482             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3483             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3484                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3485                 int last_event = ifmgd->last_cqm_event_signal;
3486                 int thold = bss_conf->cqm_rssi_thold;
3487                 int hyst = bss_conf->cqm_rssi_hyst;
3488
3489                 if (sig < thold &&
3490                     (last_event == 0 || sig < last_event - hyst)) {
3491                         ifmgd->last_cqm_event_signal = sig;
3492                         ieee80211_cqm_rssi_notify(
3493                                 &sdata->vif,
3494                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3495                                 GFP_KERNEL);
3496                 } else if (sig > thold &&
3497                            (last_event == 0 || sig > last_event + hyst)) {
3498                         ifmgd->last_cqm_event_signal = sig;
3499                         ieee80211_cqm_rssi_notify(
3500                                 &sdata->vif,
3501                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3502                                 GFP_KERNEL);
3503                 }
3504         }
3505
3506         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3507                 mlme_dbg_ratelimited(sdata,
3508                                      "cancelling AP probe due to a received beacon\n");
3509                 ieee80211_reset_ap_probe(sdata);
3510         }
3511
3512         /*
3513          * Push the beacon loss detection into the future since
3514          * we are processing a beacon from the AP just now.
3515          */
3516         ieee80211_sta_reset_beacon_monitor(sdata);
3517
3518         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3519         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3520                                           len - baselen, false, &elems,
3521                                           care_about_ies, ncrc);
3522
3523         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3524             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3525                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3526                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3527                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3528                                 ieee80211_hw_config(local,
3529                                                     IEEE80211_CONF_CHANGE_PS);
3530                         }
3531                         ieee80211_send_nullfunc(local, sdata, false);
3532                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3533                         local->pspolling = true;
3534
3535                         /*
3536                          * Here is assumed that the driver will be
3537                          * able to send ps-poll frame and receive a
3538                          * response even though power save mode is
3539                          * enabled, but some drivers might require
3540                          * to disable power save here. This needs
3541                          * to be investigated.
3542                          */
3543                         ieee80211_send_pspoll(local, sdata);
3544                 }
3545         }
3546
3547         if (sdata->vif.p2p) {
3548                 struct ieee80211_p2p_noa_attr noa = {};
3549                 int ret;
3550
3551                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3552                                             len - baselen,
3553                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3554                                             (u8 *) &noa, sizeof(noa));
3555                 if (ret >= 2) {
3556                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3557                                 /* valid noa_attr and index changed */
3558                                 sdata->u.mgd.p2p_noa_index = noa.index;
3559                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3560                                 changed |= BSS_CHANGED_P2P_PS;
3561                                 /*
3562                                  * make sure we update all information, the CRC
3563                                  * mechanism doesn't look at P2P attributes.
3564                                  */
3565                                 ifmgd->beacon_crc_valid = false;
3566                         }
3567                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3568                         /* noa_attr not found and we had valid noa_attr before */
3569                         sdata->u.mgd.p2p_noa_index = -1;
3570                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3571                         changed |= BSS_CHANGED_P2P_PS;
3572                         ifmgd->beacon_crc_valid = false;
3573                 }
3574         }
3575
3576         if (ifmgd->csa_waiting_bcn)
3577                 ieee80211_chswitch_post_beacon(sdata);
3578
3579         /*
3580          * Update beacon timing and dtim count on every beacon appearance. This
3581          * will allow the driver to use the most updated values. Do it before
3582          * comparing this one with last received beacon.
3583          * IMPORTANT: These parameters would possibly be out of sync by the time
3584          * the driver will use them. The synchronized view is currently
3585          * guaranteed only in certain callbacks.
3586          */
3587         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3588                 sdata->vif.bss_conf.sync_tsf =
3589                         le64_to_cpu(mgmt->u.beacon.timestamp);
3590                 sdata->vif.bss_conf.sync_device_ts =
3591                         rx_status->device_timestamp;
3592                 if (elems.tim)
3593                         sdata->vif.bss_conf.sync_dtim_count =
3594                                 elems.tim->dtim_count;
3595                 else
3596                         sdata->vif.bss_conf.sync_dtim_count = 0;
3597         }
3598
3599         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3600                 return;
3601         ifmgd->beacon_crc = ncrc;
3602         ifmgd->beacon_crc_valid = true;
3603
3604         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3605
3606         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3607                                          rx_status->device_timestamp,
3608                                          &elems, true);
3609
3610         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3611             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3612                                      elems.wmm_param_len))
3613                 changed |= BSS_CHANGED_QOS;
3614
3615         /*
3616          * If we haven't had a beacon before, tell the driver about the
3617          * DTIM period (and beacon timing if desired) now.
3618          */
3619         if (!ifmgd->have_beacon) {
3620                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3621                 if (elems.tim)
3622                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3623                 else
3624                         bss_conf->dtim_period = 1;
3625
3626                 changed |= BSS_CHANGED_BEACON_INFO;
3627                 ifmgd->have_beacon = true;
3628
3629                 mutex_lock(&local->iflist_mtx);
3630                 ieee80211_recalc_ps(local);
3631                 mutex_unlock(&local->iflist_mtx);
3632
3633                 ieee80211_recalc_ps_vif(sdata);
3634         }
3635
3636         if (elems.erp_info) {
3637                 erp_valid = true;
3638                 erp_value = elems.erp_info[0];
3639         } else {
3640                 erp_valid = false;
3641         }
3642         changed |= ieee80211_handle_bss_capability(sdata,
3643                         le16_to_cpu(mgmt->u.beacon.capab_info),
3644                         erp_valid, erp_value);
3645
3646         mutex_lock(&local->sta_mtx);
3647         sta = sta_info_get(sdata, bssid);
3648
3649         if (ieee80211_config_bw(sdata, sta,
3650                                 elems.ht_cap_elem, elems.ht_operation,
3651                                 elems.vht_operation, bssid, &changed)) {
3652                 mutex_unlock(&local->sta_mtx);
3653                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3654                                        WLAN_REASON_DEAUTH_LEAVING,
3655                                        true, deauth_buf);
3656                 ieee80211_report_disconnect(sdata, deauth_buf,
3657                                             sizeof(deauth_buf), true,
3658                                             WLAN_REASON_DEAUTH_LEAVING);
3659                 return;
3660         }
3661
3662         if (sta && elems.opmode_notif)
3663                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3664                                             rx_status->band);
3665         mutex_unlock(&local->sta_mtx);
3666
3667         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3668                                                elems.country_elem,
3669                                                elems.country_elem_len,
3670                                                elems.pwr_constr_elem,
3671                                                elems.cisco_dtpc_elem);
3672
3673         ieee80211_bss_info_change_notify(sdata, changed);
3674 }
3675
3676 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3677                                   struct sk_buff *skb)
3678 {
3679         struct ieee80211_rx_status *rx_status;
3680         struct ieee80211_mgmt *mgmt;
3681         u16 fc;
3682         struct ieee802_11_elems elems;
3683         int ies_len;
3684
3685         rx_status = (struct ieee80211_rx_status *) skb->cb;
3686         mgmt = (struct ieee80211_mgmt *) skb->data;
3687         fc = le16_to_cpu(mgmt->frame_control);
3688
3689         sdata_lock(sdata);
3690
3691         switch (fc & IEEE80211_FCTL_STYPE) {
3692         case IEEE80211_STYPE_BEACON:
3693                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3694                 break;
3695         case IEEE80211_STYPE_PROBE_RESP:
3696                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3697                 break;
3698         case IEEE80211_STYPE_AUTH:
3699                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3700                 break;
3701         case IEEE80211_STYPE_DEAUTH:
3702                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3703                 break;
3704         case IEEE80211_STYPE_DISASSOC:
3705                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3706                 break;
3707         case IEEE80211_STYPE_ASSOC_RESP:
3708         case IEEE80211_STYPE_REASSOC_RESP:
3709                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3710                 break;
3711         case IEEE80211_STYPE_ACTION:
3712                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3713                         ies_len = skb->len -
3714                                   offsetof(struct ieee80211_mgmt,
3715                                            u.action.u.chan_switch.variable);
3716
3717                         if (ies_len < 0)
3718                                 break;
3719
3720                         ieee802_11_parse_elems(
3721                                 mgmt->u.action.u.chan_switch.variable,
3722                                 ies_len, true, &elems);
3723
3724                         if (elems.parse_error)
3725                                 break;
3726
3727                         ieee80211_sta_process_chanswitch(sdata,
3728                                                  rx_status->mactime,
3729                                                  rx_status->device_timestamp,
3730                                                  &elems, false);
3731                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3732                         ies_len = skb->len -
3733                                   offsetof(struct ieee80211_mgmt,
3734                                            u.action.u.ext_chan_switch.variable);
3735
3736                         if (ies_len < 0)
3737                                 break;
3738
3739                         ieee802_11_parse_elems(
3740                                 mgmt->u.action.u.ext_chan_switch.variable,
3741                                 ies_len, true, &elems);
3742
3743                         if (elems.parse_error)
3744                                 break;
3745
3746                         /* for the handling code pretend this was also an IE */
3747                         elems.ext_chansw_ie =
3748                                 &mgmt->u.action.u.ext_chan_switch.data;
3749
3750                         ieee80211_sta_process_chanswitch(sdata,
3751                                                  rx_status->mactime,
3752                                                  rx_status->device_timestamp,
3753                                                  &elems, false);
3754                 }
3755                 break;
3756         }
3757         sdata_unlock(sdata);
3758 }
3759
3760 static void ieee80211_sta_timer(unsigned long data)
3761 {
3762         struct ieee80211_sub_if_data *sdata =
3763                 (struct ieee80211_sub_if_data *) data;
3764
3765         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3766 }
3767
3768 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3769                                           u8 *bssid, u8 reason, bool tx)
3770 {
3771         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3772
3773         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3774                                tx, frame_buf);
3775
3776         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3777                                     reason);
3778 }
3779
3780 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3781 {
3782         struct ieee80211_local *local = sdata->local;
3783         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3784         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3785         u32 tx_flags = 0;
3786         u16 trans = 1;
3787         u16 status = 0;
3788
3789         sdata_assert_lock(sdata);
3790
3791         if (WARN_ON_ONCE(!auth_data))
3792                 return -EINVAL;
3793
3794         auth_data->tries++;
3795
3796         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3797                 sdata_info(sdata, "authentication with %pM timed out\n",
3798                            auth_data->bss->bssid);
3799
3800                 /*
3801                  * Most likely AP is not in the range so remove the
3802                  * bss struct for that AP.
3803                  */
3804                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3805
3806                 return -ETIMEDOUT;
3807         }
3808
3809         drv_mgd_prepare_tx(local, sdata);
3810
3811         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3812                    auth_data->bss->bssid, auth_data->tries,
3813                    IEEE80211_AUTH_MAX_TRIES);
3814
3815         auth_data->expected_transaction = 2;
3816
3817         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3818                 trans = auth_data->sae_trans;
3819                 status = auth_data->sae_status;
3820                 auth_data->expected_transaction = trans;
3821         }
3822
3823         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3824                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3825                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3826
3827         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3828                             auth_data->data, auth_data->data_len,
3829                             auth_data->bss->bssid,
3830                             auth_data->bss->bssid, NULL, 0, 0,
3831                             tx_flags);
3832
3833         if (tx_flags == 0) {
3834                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3835                 auth_data->timeout_started = true;
3836                 run_again(sdata, auth_data->timeout);
3837         } else {
3838                 auth_data->timeout =
3839                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3840                 auth_data->timeout_started = true;
3841                 run_again(sdata, auth_data->timeout);
3842         }
3843
3844         return 0;
3845 }
3846
3847 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3848 {
3849         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3850         struct ieee80211_local *local = sdata->local;
3851
3852         sdata_assert_lock(sdata);
3853
3854         assoc_data->tries++;
3855         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3856                 sdata_info(sdata, "association with %pM timed out\n",
3857                            assoc_data->bss->bssid);
3858
3859                 /*
3860                  * Most likely AP is not in the range so remove the
3861                  * bss struct for that AP.
3862                  */
3863                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3864
3865                 return -ETIMEDOUT;
3866         }
3867
3868         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3869                    assoc_data->bss->bssid, assoc_data->tries,
3870                    IEEE80211_ASSOC_MAX_TRIES);
3871         ieee80211_send_assoc(sdata);
3872
3873         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3874                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3875                 assoc_data->timeout_started = true;
3876                 run_again(sdata, assoc_data->timeout);
3877         } else {
3878                 assoc_data->timeout =
3879                         round_jiffies_up(jiffies +
3880                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3881                 assoc_data->timeout_started = true;
3882                 run_again(sdata, assoc_data->timeout);
3883         }
3884
3885         return 0;
3886 }
3887
3888 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3889                                   __le16 fc, bool acked)
3890 {
3891         struct ieee80211_local *local = sdata->local;
3892
3893         sdata->u.mgd.status_fc = fc;
3894         sdata->u.mgd.status_acked = acked;
3895         sdata->u.mgd.status_received = true;
3896
3897         ieee80211_queue_work(&local->hw, &sdata->work);
3898 }
3899
3900 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3901 {
3902         struct ieee80211_local *local = sdata->local;
3903         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3904
3905         sdata_lock(sdata);
3906
3907         if (ifmgd->status_received) {
3908                 __le16 fc = ifmgd->status_fc;
3909                 bool status_acked = ifmgd->status_acked;
3910
3911                 ifmgd->status_received = false;
3912                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3913                         if (status_acked) {
3914                                 ifmgd->auth_data->timeout =
3915                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3916                                 run_again(sdata, ifmgd->auth_data->timeout);
3917                         } else {
3918                                 ifmgd->auth_data->timeout = jiffies - 1;
3919                         }
3920                         ifmgd->auth_data->timeout_started = true;
3921                 } else if (ifmgd->assoc_data &&
3922                            (ieee80211_is_assoc_req(fc) ||
3923                             ieee80211_is_reassoc_req(fc))) {
3924                         if (status_acked) {
3925                                 ifmgd->assoc_data->timeout =
3926                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3927                                 run_again(sdata, ifmgd->assoc_data->timeout);
3928                         } else {
3929                                 ifmgd->assoc_data->timeout = jiffies - 1;
3930                         }
3931                         ifmgd->assoc_data->timeout_started = true;
3932                 }
3933         }
3934
3935         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3936             time_after(jiffies, ifmgd->auth_data->timeout)) {
3937                 if (ifmgd->auth_data->done) {
3938                         /*
3939                          * ok ... we waited for assoc but userspace didn't,
3940                          * so let's just kill the auth data
3941                          */
3942                         ieee80211_destroy_auth_data(sdata, false);
3943                 } else if (ieee80211_auth(sdata)) {
3944                         u8 bssid[ETH_ALEN];
3945                         struct ieee80211_event event = {
3946                                 .type = MLME_EVENT,
3947                                 .u.mlme.data = AUTH_EVENT,
3948                                 .u.mlme.status = MLME_TIMEOUT,
3949                         };
3950
3951                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3952
3953                         ieee80211_destroy_auth_data(sdata, false);
3954
3955                         cfg80211_auth_timeout(sdata->dev, bssid);
3956                         drv_event_callback(sdata->local, sdata, &event);
3957                 }
3958         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3959                 run_again(sdata, ifmgd->auth_data->timeout);
3960
3961         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3962             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3963                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3964                     ieee80211_do_assoc(sdata)) {
3965                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3966                         struct ieee80211_event event = {
3967                                 .type = MLME_EVENT,
3968                                 .u.mlme.data = ASSOC_EVENT,
3969                                 .u.mlme.status = MLME_TIMEOUT,
3970                         };
3971
3972                         ieee80211_destroy_assoc_data(sdata, false, false);
3973                         cfg80211_assoc_timeout(sdata->dev, bss);
3974                         drv_event_callback(sdata->local, sdata, &event);
3975                 }
3976         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3977                 run_again(sdata, ifmgd->assoc_data->timeout);
3978
3979         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3980             ifmgd->associated) {
3981                 u8 bssid[ETH_ALEN];
3982                 int max_tries;
3983
3984                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3985
3986                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3987                         max_tries = max_nullfunc_tries;
3988                 else
3989                         max_tries = max_probe_tries;
3990
3991                 /* ACK received for nullfunc probing frame */
3992                 if (!ifmgd->probe_send_count)
3993                         ieee80211_reset_ap_probe(sdata);
3994                 else if (ifmgd->nullfunc_failed) {
3995                         if (ifmgd->probe_send_count < max_tries) {
3996                                 mlme_dbg(sdata,
3997                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3998                                          bssid, ifmgd->probe_send_count,
3999                                          max_tries);
4000                                 ieee80211_mgd_probe_ap_send(sdata);
4001                         } else {
4002                                 mlme_dbg(sdata,
4003                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
4004                                          bssid);
4005                                 ieee80211_sta_connection_lost(sdata, bssid,
4006                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
4007                                         false);
4008                         }
4009                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
4010                         run_again(sdata, ifmgd->probe_timeout);
4011                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
4012                         mlme_dbg(sdata,
4013                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
4014                                  bssid, probe_wait_ms);
4015                         ieee80211_sta_connection_lost(sdata, bssid,
4016                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4017                 } else if (ifmgd->probe_send_count < max_tries) {
4018                         mlme_dbg(sdata,
4019                                  "No probe response from AP %pM after %dms, try %d/%i\n",
4020                                  bssid, probe_wait_ms,
4021                                  ifmgd->probe_send_count, max_tries);
4022                         ieee80211_mgd_probe_ap_send(sdata);
4023                 } else {
4024                         /*
4025                          * We actually lost the connection ... or did we?
4026                          * Let's make sure!
4027                          */
4028                         wiphy_debug(local->hw.wiphy,
4029                                     "%s: No probe response from AP %pM"
4030                                     " after %dms, disconnecting.\n",
4031                                     sdata->name,
4032                                     bssid, probe_wait_ms);
4033
4034                         ieee80211_sta_connection_lost(sdata, bssid,
4035                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4036                 }
4037         }
4038
4039         sdata_unlock(sdata);
4040 }
4041
4042 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
4043 {
4044         struct ieee80211_sub_if_data *sdata =
4045                 (struct ieee80211_sub_if_data *) data;
4046         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4047
4048         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4049                 return;
4050
4051         sdata->u.mgd.connection_loss = false;
4052         ieee80211_queue_work(&sdata->local->hw,
4053                              &sdata->u.mgd.beacon_connection_loss_work);
4054 }
4055
4056 static void ieee80211_sta_conn_mon_timer(unsigned long data)
4057 {
4058         struct ieee80211_sub_if_data *sdata =
4059                 (struct ieee80211_sub_if_data *) data;
4060         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4061         struct ieee80211_local *local = sdata->local;
4062
4063         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4064                 return;
4065
4066         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4067 }
4068
4069 static void ieee80211_sta_monitor_work(struct work_struct *work)
4070 {
4071         struct ieee80211_sub_if_data *sdata =
4072                 container_of(work, struct ieee80211_sub_if_data,
4073                              u.mgd.monitor_work);
4074
4075         ieee80211_mgd_probe_ap(sdata, false);
4076 }
4077
4078 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4079 {
4080         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4081                 __ieee80211_stop_poll(sdata);
4082
4083                 /* let's probe the connection once */
4084                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4085                         ieee80211_queue_work(&sdata->local->hw,
4086                                              &sdata->u.mgd.monitor_work);
4087         }
4088 }
4089
4090 #ifdef CONFIG_PM
4091 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4092 {
4093         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4094         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4095
4096         sdata_lock(sdata);
4097
4098         if (ifmgd->auth_data || ifmgd->assoc_data) {
4099                 const u8 *bssid = ifmgd->auth_data ?
4100                                 ifmgd->auth_data->bss->bssid :
4101                                 ifmgd->assoc_data->bss->bssid;
4102
4103                 /*
4104                  * If we are trying to authenticate / associate while suspending,
4105                  * cfg80211 won't know and won't actually abort those attempts,
4106                  * thus we need to do that ourselves.
4107                  */
4108                 ieee80211_send_deauth_disassoc(sdata, bssid,
4109                                                IEEE80211_STYPE_DEAUTH,
4110                                                WLAN_REASON_DEAUTH_LEAVING,
4111                                                false, frame_buf);
4112                 if (ifmgd->assoc_data)
4113                         ieee80211_destroy_assoc_data(sdata, false, true);
4114                 if (ifmgd->auth_data)
4115                         ieee80211_destroy_auth_data(sdata, false);
4116                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4117                                       IEEE80211_DEAUTH_FRAME_LEN);
4118         }
4119
4120         /* This is a bit of a hack - we should find a better and more generic
4121          * solution to this. Normally when suspending, cfg80211 will in fact
4122          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4123          * auth (not so important) or assoc (this is the problem) process.
4124          *
4125          * As a consequence, it can happen that we are in the process of both
4126          * associating and suspending, and receive an association response
4127          * after cfg80211 has checked if it needs to disconnect, but before
4128          * we actually set the flag to drop incoming frames. This will then
4129          * cause the workqueue flush to process the association response in
4130          * the suspend, resulting in a successful association just before it
4131          * tries to remove the interface from the driver, which now though
4132          * has a channel context assigned ... this results in issues.
4133          *
4134          * To work around this (for now) simply deauth here again if we're
4135          * now connected.
4136          */
4137         if (ifmgd->associated && !sdata->local->wowlan) {
4138                 u8 bssid[ETH_ALEN];
4139                 struct cfg80211_deauth_request req = {
4140                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4141                         .bssid = bssid,
4142                 };
4143
4144                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4145                 ieee80211_mgd_deauth(sdata, &req);
4146         }
4147
4148         sdata_unlock(sdata);
4149 }
4150
4151 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4152 {
4153         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4154
4155         sdata_lock(sdata);
4156         if (!ifmgd->associated) {
4157                 sdata_unlock(sdata);
4158                 return;
4159         }
4160
4161         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4162                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4163                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4164                 ieee80211_sta_connection_lost(sdata,
4165                                               ifmgd->associated->bssid,
4166                                               WLAN_REASON_UNSPECIFIED,
4167                                               true);
4168                 sdata_unlock(sdata);
4169                 return;
4170         }
4171         sdata_unlock(sdata);
4172 }
4173 #endif
4174
4175 /* interface setup */
4176 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4177 {
4178         struct ieee80211_if_managed *ifmgd;
4179
4180         ifmgd = &sdata->u.mgd;
4181         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4182         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4183         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4184                   ieee80211_beacon_connection_loss_work);
4185         INIT_WORK(&ifmgd->csa_connection_drop_work,
4186                   ieee80211_csa_connection_drop_work);
4187         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4188         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4189                           ieee80211_tdls_peer_del_work);
4190         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4191                     (unsigned long) sdata);
4192         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4193                     (unsigned long) sdata);
4194         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4195                     (unsigned long) sdata);
4196         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4197                     (unsigned long) sdata);
4198         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4199                           ieee80211_sta_handle_tspec_ac_params_wk);
4200
4201         ifmgd->flags = 0;
4202         ifmgd->powersave = sdata->wdev.ps;
4203         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4204         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4205         ifmgd->p2p_noa_index = -1;
4206
4207         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4208                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4209         else
4210                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4211
4212         /* Setup TDLS data */
4213         spin_lock_init(&ifmgd->teardown_lock);
4214         ifmgd->teardown_skb = NULL;
4215         ifmgd->orig_teardown_skb = NULL;
4216 }
4217
4218 /* scan finished notification */
4219 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4220 {
4221         struct ieee80211_sub_if_data *sdata;
4222
4223         /* Restart STA timers */
4224         rcu_read_lock();
4225         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4226                 if (ieee80211_sdata_running(sdata))
4227                         ieee80211_restart_sta_timer(sdata);
4228         }
4229         rcu_read_unlock();
4230 }
4231
4232 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4233                                      struct cfg80211_bss *cbss)
4234 {
4235         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4236         const u8 *ht_cap_ie, *vht_cap_ie;
4237         const struct ieee80211_ht_cap *ht_cap;
4238         const struct ieee80211_vht_cap *vht_cap;
4239         u8 chains = 1;
4240
4241         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4242                 return chains;
4243
4244         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4245         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4246                 ht_cap = (void *)(ht_cap_ie + 2);
4247                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4248                 /*
4249                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4250                  *       "Tx Unequal Modulation Supported" fields.
4251                  */
4252         }
4253
4254         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4255                 return chains;
4256
4257         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4258         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4259                 u8 nss;
4260                 u16 tx_mcs_map;
4261
4262                 vht_cap = (void *)(vht_cap_ie + 2);
4263                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4264                 for (nss = 8; nss > 0; nss--) {
4265                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4266                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4267                                 break;
4268                 }
4269                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4270                 chains = max(chains, nss);
4271         }
4272
4273         return chains;
4274 }
4275
4276 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4277                                   struct cfg80211_bss *cbss)
4278 {
4279         struct ieee80211_local *local = sdata->local;
4280         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4281         const struct ieee80211_ht_cap *ht_cap = NULL;
4282         const struct ieee80211_ht_operation *ht_oper = NULL;
4283         const struct ieee80211_vht_operation *vht_oper = NULL;
4284         struct ieee80211_supported_band *sband;
4285         struct cfg80211_chan_def chandef;
4286         int ret;
4287         u32 i;
4288         bool have_80mhz;
4289
4290         sband = local->hw.wiphy->bands[cbss->channel->band];
4291
4292         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4293                           IEEE80211_STA_DISABLE_80P80MHZ |
4294                           IEEE80211_STA_DISABLE_160MHZ);
4295
4296         rcu_read_lock();
4297
4298         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4299             sband->ht_cap.ht_supported) {
4300                 const u8 *ht_oper_ie, *ht_cap_ie;
4301
4302                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4303                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4304                         ht_oper = (void *)(ht_oper_ie + 2);
4305
4306                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4307                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4308                         ht_cap = (void *)(ht_cap_ie + 2);
4309
4310                 if (!ht_cap) {
4311                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4312                         ht_oper = NULL;
4313                 }
4314         }
4315
4316         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4317             sband->vht_cap.vht_supported) {
4318                 const u8 *vht_oper_ie, *vht_cap;
4319
4320                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4321                                                    WLAN_EID_VHT_OPERATION);
4322                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4323                         vht_oper = (void *)(vht_oper_ie + 2);
4324                 if (vht_oper && !ht_oper) {
4325                         vht_oper = NULL;
4326                         sdata_info(sdata,
4327                                    "AP advertised VHT without HT, disabling both\n");
4328                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4329                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4330                 }
4331
4332                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4333                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4334                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4335                         vht_oper = NULL;
4336                 }
4337         }
4338
4339         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4340         have_80mhz = false;
4341         for (i = 0; i < sband->n_channels; i++) {
4342                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4343                                                 IEEE80211_CHAN_NO_80MHZ))
4344                         continue;
4345
4346                 have_80mhz = true;
4347                 break;
4348         }
4349
4350         if (!have_80mhz)
4351                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4352
4353         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4354                                                      cbss->channel,
4355                                                      ht_cap, ht_oper, vht_oper,
4356                                                      &chandef, false);
4357
4358         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4359                                       local->rx_chains);
4360
4361         rcu_read_unlock();
4362
4363         /* will change later if needed */
4364         sdata->smps_mode = IEEE80211_SMPS_OFF;
4365
4366         mutex_lock(&local->mtx);
4367         /*
4368          * If this fails (possibly due to channel context sharing
4369          * on incompatible channels, e.g. 80+80 and 160 sharing the
4370          * same control channel) try to use a smaller bandwidth.
4371          */
4372         ret = ieee80211_vif_use_channel(sdata, &chandef,
4373                                         IEEE80211_CHANCTX_SHARED);
4374
4375         /* don't downgrade for 5 and 10 MHz channels, though. */
4376         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4377             chandef.width == NL80211_CHAN_WIDTH_10)
4378                 goto out;
4379
4380         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4381                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4382                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4383                                                 IEEE80211_CHANCTX_SHARED);
4384         }
4385  out:
4386         mutex_unlock(&local->mtx);
4387         return ret;
4388 }
4389
4390 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4391                                      struct cfg80211_bss *cbss, bool assoc,
4392                                      bool override)
4393 {
4394         struct ieee80211_local *local = sdata->local;
4395         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4396         struct ieee80211_bss *bss = (void *)cbss->priv;
4397         struct sta_info *new_sta = NULL;
4398         struct ieee80211_supported_band *sband;
4399         bool have_sta = false;
4400         int err;
4401
4402         sband = local->hw.wiphy->bands[cbss->channel->band];
4403
4404         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4405                 return -EINVAL;
4406
4407         /* If a reconfig is happening, bail out */
4408         if (local->in_reconfig)
4409                 return -EBUSY;
4410
4411         if (assoc) {
4412                 rcu_read_lock();
4413                 have_sta = sta_info_get(sdata, cbss->bssid);
4414                 rcu_read_unlock();
4415         }
4416
4417         if (!have_sta) {
4418                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4419                 if (!new_sta)
4420                         return -ENOMEM;
4421         }
4422
4423         if (new_sta || override) {
4424                 err = ieee80211_prep_channel(sdata, cbss);
4425                 if (err) {
4426                         if (new_sta)
4427                                 sta_info_free(local, new_sta);
4428                         return -EINVAL;
4429                 }
4430         }
4431
4432         if (new_sta) {
4433                 u32 rates = 0, basic_rates = 0;
4434                 bool have_higher_than_11mbit;
4435                 int min_rate = INT_MAX, min_rate_index = -1;
4436                 struct ieee80211_chanctx_conf *chanctx_conf;
4437                 const struct cfg80211_bss_ies *ies;
4438                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4439                 u32 rate_flags;
4440
4441                 rcu_read_lock();
4442                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4443                 if (WARN_ON(!chanctx_conf)) {
4444                         rcu_read_unlock();
4445                         sta_info_free(local, new_sta);
4446                         return -EINVAL;
4447                 }
4448                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4449                 rcu_read_unlock();
4450
4451                 ieee80211_get_rates(sband, bss->supp_rates,
4452                                     bss->supp_rates_len,
4453                                     &rates, &basic_rates,
4454                                     &have_higher_than_11mbit,
4455                                     &min_rate, &min_rate_index,
4456                                     shift, rate_flags);
4457
4458                 /*
4459                  * This used to be a workaround for basic rates missing
4460                  * in the association response frame. Now that we no
4461                  * longer use the basic rates from there, it probably
4462                  * doesn't happen any more, but keep the workaround so
4463                  * in case some *other* APs are buggy in different ways
4464                  * we can connect -- with a warning.
4465                  */
4466                 if (!basic_rates && min_rate_index >= 0) {
4467                         sdata_info(sdata,
4468                                    "No basic rates, using min rate instead\n");
4469                         basic_rates = BIT(min_rate_index);
4470                 }
4471
4472                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4473                 sdata->vif.bss_conf.basic_rates = basic_rates;
4474
4475                 /* cf. IEEE 802.11 9.2.12 */
4476                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4477                     have_higher_than_11mbit)
4478                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4479                 else
4480                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4481
4482                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4483
4484                 /* set timing information */
4485                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4486                 rcu_read_lock();
4487                 ies = rcu_dereference(cbss->beacon_ies);
4488                 if (ies) {
4489                         const u8 *tim_ie;
4490
4491                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4492                         sdata->vif.bss_conf.sync_device_ts =
4493                                 bss->device_ts_beacon;
4494                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4495                                                   ies->data, ies->len);
4496                         if (tim_ie && tim_ie[1] >= 2)
4497                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4498                         else
4499                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4500                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4501                                                TIMING_BEACON_ONLY)) {
4502                         ies = rcu_dereference(cbss->proberesp_ies);
4503                         /* must be non-NULL since beacon IEs were NULL */
4504                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4505                         sdata->vif.bss_conf.sync_device_ts =
4506                                 bss->device_ts_presp;
4507                         sdata->vif.bss_conf.sync_dtim_count = 0;
4508                 } else {
4509                         sdata->vif.bss_conf.sync_tsf = 0;
4510                         sdata->vif.bss_conf.sync_device_ts = 0;
4511                         sdata->vif.bss_conf.sync_dtim_count = 0;
4512                 }
4513                 rcu_read_unlock();
4514
4515                 /* tell driver about BSSID, basic rates and timing */
4516                 ieee80211_bss_info_change_notify(sdata,
4517                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4518                         BSS_CHANGED_BEACON_INT);
4519
4520                 if (assoc)
4521                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4522
4523                 err = sta_info_insert(new_sta);
4524                 new_sta = NULL;
4525                 if (err) {
4526                         sdata_info(sdata,
4527                                    "failed to insert STA entry for the AP (error %d)\n",
4528                                    err);
4529                         return err;
4530                 }
4531         } else
4532                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4533
4534         /* Cancel scan to ensure that nothing interferes with connection */
4535         if (local->scanning)
4536                 ieee80211_scan_cancel(local);
4537
4538         return 0;
4539 }
4540
4541 /* config hooks */
4542 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4543                        struct cfg80211_auth_request *req)
4544 {
4545         struct ieee80211_local *local = sdata->local;
4546         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4547         struct ieee80211_mgd_auth_data *auth_data;
4548         u16 auth_alg;
4549         int err;
4550
4551         /* prepare auth data structure */
4552
4553         switch (req->auth_type) {
4554         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4555                 auth_alg = WLAN_AUTH_OPEN;
4556                 break;
4557         case NL80211_AUTHTYPE_SHARED_KEY:
4558                 if (IS_ERR(local->wep_tx_tfm))
4559                         return -EOPNOTSUPP;
4560                 auth_alg = WLAN_AUTH_SHARED_KEY;
4561                 break;
4562         case NL80211_AUTHTYPE_FT:
4563                 auth_alg = WLAN_AUTH_FT;
4564                 break;
4565         case NL80211_AUTHTYPE_NETWORK_EAP:
4566                 auth_alg = WLAN_AUTH_LEAP;
4567                 break;
4568         case NL80211_AUTHTYPE_SAE:
4569                 auth_alg = WLAN_AUTH_SAE;
4570                 break;
4571         default:
4572                 return -EOPNOTSUPP;
4573         }
4574
4575         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4576                             req->ie_len, GFP_KERNEL);
4577         if (!auth_data)
4578                 return -ENOMEM;
4579
4580         auth_data->bss = req->bss;
4581
4582         if (req->sae_data_len >= 4) {
4583                 __le16 *pos = (__le16 *) req->sae_data;
4584                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4585                 auth_data->sae_status = le16_to_cpu(pos[1]);
4586                 memcpy(auth_data->data, req->sae_data + 4,
4587                        req->sae_data_len - 4);
4588                 auth_data->data_len += req->sae_data_len - 4;
4589         }
4590
4591         if (req->ie && req->ie_len) {
4592                 memcpy(&auth_data->data[auth_data->data_len],
4593                        req->ie, req->ie_len);
4594                 auth_data->data_len += req->ie_len;
4595         }
4596
4597         if (req->key && req->key_len) {
4598                 auth_data->key_len = req->key_len;
4599                 auth_data->key_idx = req->key_idx;
4600                 memcpy(auth_data->key, req->key, req->key_len);
4601         }
4602
4603         auth_data->algorithm = auth_alg;
4604
4605         /* try to authenticate/probe */
4606
4607         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4608             ifmgd->assoc_data) {
4609                 err = -EBUSY;
4610                 goto err_free;
4611         }
4612
4613         if (ifmgd->auth_data)
4614                 ieee80211_destroy_auth_data(sdata, false);
4615
4616         /* prep auth_data so we don't go into idle on disassoc */
4617         ifmgd->auth_data = auth_data;
4618
4619         if (ifmgd->associated) {
4620                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4621
4622                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4623                                        WLAN_REASON_UNSPECIFIED,
4624                                        false, frame_buf);
4625
4626                 ieee80211_report_disconnect(sdata, frame_buf,
4627                                             sizeof(frame_buf), true,
4628                                             WLAN_REASON_UNSPECIFIED);
4629         }
4630
4631         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4632
4633         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4634         if (err)
4635                 goto err_clear;
4636
4637         err = ieee80211_auth(sdata);
4638         if (err) {
4639                 sta_info_destroy_addr(sdata, req->bss->bssid);
4640                 goto err_clear;
4641         }
4642
4643         /* hold our own reference */
4644         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4645         return 0;
4646
4647  err_clear:
4648         eth_zero_addr(ifmgd->bssid);
4649         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4650         ifmgd->auth_data = NULL;
4651         mutex_lock(&sdata->local->mtx);
4652         ieee80211_vif_release_channel(sdata);
4653         mutex_unlock(&sdata->local->mtx);
4654  err_free:
4655         kfree(auth_data);
4656         return err;
4657 }
4658
4659 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4660                         struct cfg80211_assoc_request *req)
4661 {
4662         struct ieee80211_local *local = sdata->local;
4663         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4664         struct ieee80211_bss *bss = (void *)req->bss->priv;
4665         struct ieee80211_mgd_assoc_data *assoc_data;
4666         const struct cfg80211_bss_ies *beacon_ies;
4667         struct ieee80211_supported_band *sband;
4668         const u8 *ssidie, *ht_ie, *vht_ie;
4669         int i, err;
4670         bool override = false;
4671
4672         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4673         if (!assoc_data)
4674                 return -ENOMEM;
4675
4676         rcu_read_lock();
4677         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4678         if (!ssidie || ssidie[1] > sizeof(assoc_data->ssid)) {
4679                 rcu_read_unlock();
4680                 kfree(assoc_data);
4681                 return -EINVAL;
4682         }
4683         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4684         assoc_data->ssid_len = ssidie[1];
4685         rcu_read_unlock();
4686
4687         if (ifmgd->associated) {
4688                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4689
4690                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4691                                        WLAN_REASON_UNSPECIFIED,
4692                                        false, frame_buf);
4693
4694                 ieee80211_report_disconnect(sdata, frame_buf,
4695                                             sizeof(frame_buf), true,
4696                                             WLAN_REASON_UNSPECIFIED);
4697         }
4698
4699         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4700                 err = -EBUSY;
4701                 goto err_free;
4702         }
4703
4704         if (ifmgd->assoc_data) {
4705                 err = -EBUSY;
4706                 goto err_free;
4707         }
4708
4709         if (ifmgd->auth_data) {
4710                 bool match;
4711
4712                 /* keep sta info, bssid if matching */
4713                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4714                 ieee80211_destroy_auth_data(sdata, match);
4715         }
4716
4717         /* prepare assoc data */
4718
4719         ifmgd->beacon_crc_valid = false;
4720
4721         assoc_data->wmm = bss->wmm_used &&
4722                           (local->hw.queues >= IEEE80211_NUM_ACS);
4723
4724         /*
4725          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4726          * We still associate in non-HT mode (11a/b/g) if any one of these
4727          * ciphers is configured as pairwise.
4728          * We can set this to true for non-11n hardware, that'll be checked
4729          * separately along with the peer capabilities.
4730          */
4731         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4732                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4733                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4734                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4735                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4736                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4737                         netdev_info(sdata->dev,
4738                                     "disabling HT/VHT due to WEP/TKIP use\n");
4739                 }
4740         }
4741
4742         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4743         sband = local->hw.wiphy->bands[req->bss->channel->band];
4744         if (!sband->ht_cap.ht_supported ||
4745             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4746             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4747                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4748                 if (!bss->wmm_used &&
4749                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4750                         netdev_info(sdata->dev,
4751                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4752         }
4753
4754         /* disable VHT if we don't support it or the AP doesn't use WMM */
4755         if (!sband->vht_cap.vht_supported ||
4756             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4757             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4758                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4759                 if (!bss->wmm_used &&
4760                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4761                         netdev_info(sdata->dev,
4762                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4763         }
4764
4765         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4766         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4767                sizeof(ifmgd->ht_capa_mask));
4768
4769         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4770         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4771                sizeof(ifmgd->vht_capa_mask));
4772
4773         if (req->ie && req->ie_len) {
4774                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4775                 assoc_data->ie_len = req->ie_len;
4776         }
4777
4778         assoc_data->bss = req->bss;
4779
4780         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4781                 if (ifmgd->powersave)
4782                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4783                 else
4784                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4785         } else
4786                 sdata->smps_mode = ifmgd->req_smps;
4787
4788         assoc_data->capability = req->bss->capability;
4789         assoc_data->supp_rates = bss->supp_rates;
4790         assoc_data->supp_rates_len = bss->supp_rates_len;
4791
4792         rcu_read_lock();
4793         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4794         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4795                 assoc_data->ap_ht_param =
4796                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4797         else
4798                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4799         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4800         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4801                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4802                        sizeof(struct ieee80211_vht_cap));
4803         else
4804                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4805         rcu_read_unlock();
4806
4807         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4808                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4809              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4810                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4811
4812         if (bss->wmm_used && bss->uapsd_supported &&
4813             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4814                 assoc_data->uapsd = true;
4815                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4816         } else {
4817                 assoc_data->uapsd = false;
4818                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4819         }
4820
4821         if (req->prev_bssid)
4822                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4823
4824         if (req->use_mfp) {
4825                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4826                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4827         } else {
4828                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4829                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4830         }
4831
4832         if (req->flags & ASSOC_REQ_USE_RRM)
4833                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4834         else
4835                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4836
4837         if (req->crypto.control_port)
4838                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4839         else
4840                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4841
4842         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4843         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4844         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4845                                                         sdata->vif.type);
4846
4847         /* kick off associate process */
4848
4849         ifmgd->assoc_data = assoc_data;
4850         ifmgd->dtim_period = 0;
4851         ifmgd->have_beacon = false;
4852
4853         /* override HT/VHT configuration only if the AP and we support it */
4854         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4855                 struct ieee80211_sta_ht_cap sta_ht_cap;
4856
4857                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4858                         override = true;
4859
4860                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4861                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4862
4863                 /* check for 40 MHz disable override */
4864                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4865                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4866                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4867                         override = true;
4868
4869                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4870                     req->flags & ASSOC_REQ_DISABLE_VHT)
4871                         override = true;
4872         }
4873
4874         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4875                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4876                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4877         }
4878
4879         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4880                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4881
4882         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4883         if (err)
4884                 goto err_clear;
4885
4886         rcu_read_lock();
4887         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4888
4889         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4890             !beacon_ies) {
4891                 /*
4892                  * Wait up to one beacon interval ...
4893                  * should this be more if we miss one?
4894                  */
4895                 sdata_info(sdata, "waiting for beacon from %pM\n",
4896                            ifmgd->bssid);
4897                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4898                 assoc_data->timeout_started = true;
4899                 assoc_data->need_beacon = true;
4900         } else if (beacon_ies) {
4901                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4902                                                     beacon_ies->data,
4903                                                     beacon_ies->len);
4904                 u8 dtim_count = 0;
4905
4906                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4907                         const struct ieee80211_tim_ie *tim;
4908                         tim = (void *)(tim_ie + 2);
4909                         ifmgd->dtim_period = tim->dtim_period;
4910                         dtim_count = tim->dtim_count;
4911                 }
4912                 ifmgd->have_beacon = true;
4913                 assoc_data->timeout = jiffies;
4914                 assoc_data->timeout_started = true;
4915
4916                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4917                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4918                         sdata->vif.bss_conf.sync_device_ts =
4919                                 bss->device_ts_beacon;
4920                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4921                 }
4922         } else {
4923                 assoc_data->timeout = jiffies;
4924                 assoc_data->timeout_started = true;
4925         }
4926         rcu_read_unlock();
4927
4928         run_again(sdata, assoc_data->timeout);
4929
4930         if (bss->corrupt_data) {
4931                 char *corrupt_type = "data";
4932                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4933                         if (bss->corrupt_data &
4934                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4935                                 corrupt_type = "beacon and probe response";
4936                         else
4937                                 corrupt_type = "beacon";
4938                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4939                         corrupt_type = "probe response";
4940                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4941                            corrupt_type);
4942         }
4943
4944         return 0;
4945  err_clear:
4946         eth_zero_addr(ifmgd->bssid);
4947         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4948         ifmgd->assoc_data = NULL;
4949  err_free:
4950         kfree(assoc_data);
4951         return err;
4952 }
4953
4954 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4955                          struct cfg80211_deauth_request *req)
4956 {
4957         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4958         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4959         bool tx = !req->local_state_change;
4960
4961         if (ifmgd->auth_data &&
4962             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4963                 sdata_info(sdata,
4964                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4965                            req->bssid, req->reason_code,
4966                            ieee80211_get_reason_code_string(req->reason_code));
4967
4968                 drv_mgd_prepare_tx(sdata->local, sdata);
4969                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4970                                                IEEE80211_STYPE_DEAUTH,
4971                                                req->reason_code, tx,
4972                                                frame_buf);
4973                 ieee80211_destroy_auth_data(sdata, false);
4974                 ieee80211_report_disconnect(sdata, frame_buf,
4975                                             sizeof(frame_buf), true,
4976                                             req->reason_code);
4977
4978                 return 0;
4979         }
4980
4981         if (ifmgd->assoc_data &&
4982             ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4983                 sdata_info(sdata,
4984                            "aborting association with %pM by local choice (Reason: %u=%s)\n",
4985                            req->bssid, req->reason_code,
4986                            ieee80211_get_reason_code_string(req->reason_code));
4987
4988                 drv_mgd_prepare_tx(sdata->local, sdata);
4989                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4990                                                IEEE80211_STYPE_DEAUTH,
4991                                                req->reason_code, tx,
4992                                                frame_buf);
4993                 ieee80211_destroy_assoc_data(sdata, false, true);
4994                 ieee80211_report_disconnect(sdata, frame_buf,
4995                                             sizeof(frame_buf), true,
4996                                             req->reason_code);
4997                 return 0;
4998         }
4999
5000         if (ifmgd->associated &&
5001             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5002                 sdata_info(sdata,
5003                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
5004                            req->bssid, req->reason_code,
5005                            ieee80211_get_reason_code_string(req->reason_code));
5006
5007                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5008                                        req->reason_code, tx, frame_buf);
5009                 ieee80211_report_disconnect(sdata, frame_buf,
5010                                             sizeof(frame_buf), true,
5011                                             req->reason_code);
5012                 return 0;
5013         }
5014
5015         return -ENOTCONN;
5016 }
5017
5018 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5019                            struct cfg80211_disassoc_request *req)
5020 {
5021         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5022         u8 bssid[ETH_ALEN];
5023         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5024
5025         /*
5026          * cfg80211 should catch this ... but it's racy since
5027          * we can receive a disassoc frame, process it, hand it
5028          * to cfg80211 while that's in a locked section already
5029          * trying to tell us that the user wants to disconnect.
5030          */
5031         if (ifmgd->associated != req->bss)
5032                 return -ENOLINK;
5033
5034         sdata_info(sdata,
5035                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
5036                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5037
5038         memcpy(bssid, req->bss->bssid, ETH_ALEN);
5039         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5040                                req->reason_code, !req->local_state_change,
5041                                frame_buf);
5042
5043         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5044                                     req->reason_code);
5045
5046         return 0;
5047 }
5048
5049 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5050 {
5051         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5052
5053         /*
5054          * Make sure some work items will not run after this,
5055          * they will not do anything but might not have been
5056          * cancelled when disconnecting.
5057          */
5058         cancel_work_sync(&ifmgd->monitor_work);
5059         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5060         cancel_work_sync(&ifmgd->request_smps_work);
5061         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5062         cancel_work_sync(&ifmgd->chswitch_work);
5063         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5064
5065         sdata_lock(sdata);
5066         if (ifmgd->assoc_data) {
5067                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5068                 ieee80211_destroy_assoc_data(sdata, false, false);
5069                 cfg80211_assoc_timeout(sdata->dev, bss);
5070         }
5071         if (ifmgd->auth_data)
5072                 ieee80211_destroy_auth_data(sdata, false);
5073         spin_lock_bh(&ifmgd->teardown_lock);
5074         if (ifmgd->teardown_skb) {
5075                 kfree_skb(ifmgd->teardown_skb);
5076                 ifmgd->teardown_skb = NULL;
5077                 ifmgd->orig_teardown_skb = NULL;
5078         }
5079         spin_unlock_bh(&ifmgd->teardown_lock);
5080         del_timer_sync(&ifmgd->timer);
5081         sdata_unlock(sdata);
5082 }
5083
5084 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5085                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5086                                gfp_t gfp)
5087 {
5088         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5089
5090         trace_api_cqm_rssi_notify(sdata, rssi_event);
5091
5092         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5093 }
5094 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5095
5096 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5097 {
5098         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5099
5100         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5101
5102         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5103 }
5104 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);