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         /* XXX: shouldn't really modify cfg80211-owned data! */
1108         ifmgd->associated->channel = sdata->csa_chandef.chan;
1109
1110         ifmgd->csa_waiting_bcn = true;
1111
1112         ieee80211_sta_reset_beacon_monitor(sdata);
1113         ieee80211_sta_reset_conn_monitor(sdata);
1114
1115 out:
1116         mutex_unlock(&local->chanctx_mtx);
1117         mutex_unlock(&local->mtx);
1118         sdata_unlock(sdata);
1119 }
1120
1121 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1122 {
1123         struct ieee80211_local *local = sdata->local;
1124         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1125         int ret;
1126
1127         sdata_assert_lock(sdata);
1128
1129         WARN_ON(!sdata->vif.csa_active);
1130
1131         if (sdata->csa_block_tx) {
1132                 ieee80211_wake_vif_queues(local, sdata,
1133                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1134                 sdata->csa_block_tx = false;
1135         }
1136
1137         sdata->vif.csa_active = false;
1138         ifmgd->csa_waiting_bcn = false;
1139
1140         ret = drv_post_channel_switch(sdata);
1141         if (ret) {
1142                 sdata_info(sdata,
1143                            "driver post channel switch failed, disconnecting\n");
1144                 ieee80211_queue_work(&local->hw,
1145                                      &ifmgd->csa_connection_drop_work);
1146                 return;
1147         }
1148
1149         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1150 }
1151
1152 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1153 {
1154         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1155         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1156
1157         trace_api_chswitch_done(sdata, success);
1158         if (!success) {
1159                 sdata_info(sdata,
1160                            "driver channel switch failed, disconnecting\n");
1161                 ieee80211_queue_work(&sdata->local->hw,
1162                                      &ifmgd->csa_connection_drop_work);
1163         } else {
1164                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1165         }
1166 }
1167 EXPORT_SYMBOL(ieee80211_chswitch_done);
1168
1169 static void ieee80211_chswitch_timer(unsigned long data)
1170 {
1171         struct ieee80211_sub_if_data *sdata =
1172                 (struct ieee80211_sub_if_data *) data;
1173
1174         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1175 }
1176
1177 static void
1178 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1179                                  u64 timestamp, u32 device_timestamp,
1180                                  struct ieee802_11_elems *elems,
1181                                  bool beacon)
1182 {
1183         struct ieee80211_local *local = sdata->local;
1184         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1185         struct cfg80211_bss *cbss = ifmgd->associated;
1186         struct ieee80211_chanctx_conf *conf;
1187         struct ieee80211_chanctx *chanctx;
1188         enum ieee80211_band current_band;
1189         struct ieee80211_csa_ie csa_ie;
1190         struct ieee80211_channel_switch ch_switch;
1191         int res;
1192
1193         sdata_assert_lock(sdata);
1194
1195         if (!cbss)
1196                 return;
1197
1198         if (local->scanning)
1199                 return;
1200
1201         /* disregard subsequent announcements if we are already processing */
1202         if (sdata->vif.csa_active)
1203                 return;
1204
1205         current_band = cbss->channel->band;
1206         memset(&csa_ie, 0, sizeof(csa_ie));
1207         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1208                                            ifmgd->flags,
1209                                            ifmgd->associated->bssid, &csa_ie);
1210         if (res < 0)
1211                 ieee80211_queue_work(&local->hw,
1212                                      &ifmgd->csa_connection_drop_work);
1213         if (res)
1214                 return;
1215
1216         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1217                                      IEEE80211_CHAN_DISABLED)) {
1218                 sdata_info(sdata,
1219                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1220                            ifmgd->associated->bssid,
1221                            csa_ie.chandef.chan->center_freq,
1222                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1223                            csa_ie.chandef.center_freq2);
1224                 ieee80211_queue_work(&local->hw,
1225                                      &ifmgd->csa_connection_drop_work);
1226                 return;
1227         }
1228
1229         if (cfg80211_chandef_identical(&csa_ie.chandef,
1230                                        &sdata->vif.bss_conf.chandef)) {
1231                 if (ifmgd->csa_ignored_same_chan)
1232                         return;
1233                 sdata_info(sdata,
1234                            "AP %pM tries to chanswitch to same channel, ignore\n",
1235                            ifmgd->associated->bssid);
1236                 ifmgd->csa_ignored_same_chan = true;
1237                 return;
1238         }
1239
1240         /*
1241          * Drop all TDLS peers - either we disconnect or move to a different
1242          * channel from this point on. There's no telling what our peer will do.
1243          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1244          * have an incompatible wider chandef.
1245          */
1246         ieee80211_teardown_tdls_peers(sdata);
1247
1248         mutex_lock(&local->mtx);
1249         mutex_lock(&local->chanctx_mtx);
1250         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1251                                          lockdep_is_held(&local->chanctx_mtx));
1252         if (!conf) {
1253                 sdata_info(sdata,
1254                            "no channel context assigned to vif?, disconnecting\n");
1255                 goto drop_connection;
1256         }
1257
1258         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1259
1260         if (local->use_chanctx &&
1261             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1262                 sdata_info(sdata,
1263                            "driver doesn't support chan-switch with channel contexts\n");
1264                 goto drop_connection;
1265         }
1266
1267         ch_switch.timestamp = timestamp;
1268         ch_switch.device_timestamp = device_timestamp;
1269         ch_switch.block_tx = csa_ie.mode;
1270         ch_switch.chandef = csa_ie.chandef;
1271         ch_switch.count = csa_ie.count;
1272
1273         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1274                 sdata_info(sdata,
1275                            "preparing for channel switch failed, disconnecting\n");
1276                 goto drop_connection;
1277         }
1278
1279         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1280                                             chanctx->mode, false);
1281         if (res) {
1282                 sdata_info(sdata,
1283                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1284                            res);
1285                 goto drop_connection;
1286         }
1287         mutex_unlock(&local->chanctx_mtx);
1288
1289         sdata->vif.csa_active = true;
1290         sdata->csa_chandef = csa_ie.chandef;
1291         sdata->csa_block_tx = csa_ie.mode;
1292         ifmgd->csa_ignored_same_chan = false;
1293
1294         if (sdata->csa_block_tx)
1295                 ieee80211_stop_vif_queues(local, sdata,
1296                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1297         mutex_unlock(&local->mtx);
1298
1299         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1300                                           csa_ie.count);
1301
1302         if (local->ops->channel_switch) {
1303                 /* use driver's channel switch callback */
1304                 drv_channel_switch(local, sdata, &ch_switch);
1305                 return;
1306         }
1307
1308         /* channel switch handled in software */
1309         if (csa_ie.count <= 1)
1310                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1311         else
1312                 mod_timer(&ifmgd->chswitch_timer,
1313                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1314                                          cbss->beacon_interval));
1315         return;
1316  drop_connection:
1317         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1318         mutex_unlock(&local->chanctx_mtx);
1319         mutex_unlock(&local->mtx);
1320 }
1321
1322 static bool
1323 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1324                                  struct ieee80211_channel *channel,
1325                                  const u8 *country_ie, u8 country_ie_len,
1326                                  const u8 *pwr_constr_elem,
1327                                  int *chan_pwr, int *pwr_reduction)
1328 {
1329         struct ieee80211_country_ie_triplet *triplet;
1330         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1331         int i, chan_increment;
1332         bool have_chan_pwr = false;
1333
1334         /* Invalid IE */
1335         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1336                 return false;
1337
1338         triplet = (void *)(country_ie + 3);
1339         country_ie_len -= 3;
1340
1341         switch (channel->band) {
1342         default:
1343                 WARN_ON_ONCE(1);
1344                 /* fall through */
1345         case IEEE80211_BAND_2GHZ:
1346         case IEEE80211_BAND_60GHZ:
1347                 chan_increment = 1;
1348                 break;
1349         case IEEE80211_BAND_5GHZ:
1350                 chan_increment = 4;
1351                 break;
1352         }
1353
1354         /* find channel */
1355         while (country_ie_len >= 3) {
1356                 u8 first_channel = triplet->chans.first_channel;
1357
1358                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1359                         goto next;
1360
1361                 for (i = 0; i < triplet->chans.num_channels; i++) {
1362                         if (first_channel + i * chan_increment == chan) {
1363                                 have_chan_pwr = true;
1364                                 *chan_pwr = triplet->chans.max_power;
1365                                 break;
1366                         }
1367                 }
1368                 if (have_chan_pwr)
1369                         break;
1370
1371  next:
1372                 triplet++;
1373                 country_ie_len -= 3;
1374         }
1375
1376         if (have_chan_pwr && pwr_constr_elem)
1377                 *pwr_reduction = *pwr_constr_elem;
1378         else
1379                 *pwr_reduction = 0;
1380
1381         return have_chan_pwr;
1382 }
1383
1384 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1385                                       struct ieee80211_channel *channel,
1386                                       const u8 *cisco_dtpc_ie,
1387                                       int *pwr_level)
1388 {
1389         /* From practical testing, the first data byte of the DTPC element
1390          * seems to contain the requested dBm level, and the CLI on Cisco
1391          * APs clearly state the range is -127 to 127 dBm, which indicates
1392          * a signed byte, although it seemingly never actually goes negative.
1393          * The other byte seems to always be zero.
1394          */
1395         *pwr_level = (__s8)cisco_dtpc_ie[4];
1396 }
1397
1398 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1399                                        struct ieee80211_channel *channel,
1400                                        struct ieee80211_mgmt *mgmt,
1401                                        const u8 *country_ie, u8 country_ie_len,
1402                                        const u8 *pwr_constr_ie,
1403                                        const u8 *cisco_dtpc_ie)
1404 {
1405         bool has_80211h_pwr = false, has_cisco_pwr = false;
1406         int chan_pwr = 0, pwr_reduction_80211h = 0;
1407         int pwr_level_cisco, pwr_level_80211h;
1408         int new_ap_level;
1409         __le16 capab = mgmt->u.probe_resp.capab_info;
1410
1411         if (country_ie &&
1412             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1413              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1414                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1415                         sdata, channel, country_ie, country_ie_len,
1416                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1417                 pwr_level_80211h =
1418                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1419         }
1420
1421         if (cisco_dtpc_ie) {
1422                 ieee80211_find_cisco_dtpc(
1423                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1424                 has_cisco_pwr = true;
1425         }
1426
1427         if (!has_80211h_pwr && !has_cisco_pwr)
1428                 return 0;
1429
1430         /* If we have both 802.11h and Cisco DTPC, apply both limits
1431          * by picking the smallest of the two power levels advertised.
1432          */
1433         if (has_80211h_pwr &&
1434             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1435                 new_ap_level = pwr_level_80211h;
1436
1437                 if (sdata->ap_power_level == new_ap_level)
1438                         return 0;
1439
1440                 sdata_dbg(sdata,
1441                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1442                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1443                           sdata->u.mgd.bssid);
1444         } else {  /* has_cisco_pwr is always true here. */
1445                 new_ap_level = pwr_level_cisco;
1446
1447                 if (sdata->ap_power_level == new_ap_level)
1448                         return 0;
1449
1450                 sdata_dbg(sdata,
1451                           "Limiting TX power to %d dBm as advertised by %pM\n",
1452                           pwr_level_cisco, sdata->u.mgd.bssid);
1453         }
1454
1455         sdata->ap_power_level = new_ap_level;
1456         if (__ieee80211_recalc_txpower(sdata))
1457                 return BSS_CHANGED_TXPOWER;
1458         return 0;
1459 }
1460
1461 /* powersave */
1462 static void ieee80211_enable_ps(struct ieee80211_local *local,
1463                                 struct ieee80211_sub_if_data *sdata)
1464 {
1465         struct ieee80211_conf *conf = &local->hw.conf;
1466
1467         /*
1468          * If we are scanning right now then the parameters will
1469          * take effect when scan finishes.
1470          */
1471         if (local->scanning)
1472                 return;
1473
1474         if (conf->dynamic_ps_timeout > 0 &&
1475             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1476                 mod_timer(&local->dynamic_ps_timer, jiffies +
1477                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1478         } else {
1479                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1480                         ieee80211_send_nullfunc(local, sdata, true);
1481
1482                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1483                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1484                         return;
1485
1486                 conf->flags |= IEEE80211_CONF_PS;
1487                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1488         }
1489 }
1490
1491 static void ieee80211_change_ps(struct ieee80211_local *local)
1492 {
1493         struct ieee80211_conf *conf = &local->hw.conf;
1494
1495         if (local->ps_sdata) {
1496                 ieee80211_enable_ps(local, local->ps_sdata);
1497         } else if (conf->flags & IEEE80211_CONF_PS) {
1498                 conf->flags &= ~IEEE80211_CONF_PS;
1499                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1500                 del_timer_sync(&local->dynamic_ps_timer);
1501                 cancel_work_sync(&local->dynamic_ps_enable_work);
1502         }
1503 }
1504
1505 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1506 {
1507         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1508         struct sta_info *sta = NULL;
1509         bool authorized = false;
1510
1511         if (!mgd->powersave)
1512                 return false;
1513
1514         if (mgd->broken_ap)
1515                 return false;
1516
1517         if (!mgd->associated)
1518                 return false;
1519
1520         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1521                 return false;
1522
1523         if (!mgd->have_beacon)
1524                 return false;
1525
1526         rcu_read_lock();
1527         sta = sta_info_get(sdata, mgd->bssid);
1528         if (sta)
1529                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1530         rcu_read_unlock();
1531
1532         return authorized;
1533 }
1534
1535 /* need to hold RTNL or interface lock */
1536 void ieee80211_recalc_ps(struct ieee80211_local *local)
1537 {
1538         struct ieee80211_sub_if_data *sdata, *found = NULL;
1539         int count = 0;
1540         int timeout;
1541
1542         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1543                 local->ps_sdata = NULL;
1544                 return;
1545         }
1546
1547         list_for_each_entry(sdata, &local->interfaces, list) {
1548                 if (!ieee80211_sdata_running(sdata))
1549                         continue;
1550                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1551                         /* If an AP vif is found, then disable PS
1552                          * by setting the count to zero thereby setting
1553                          * ps_sdata to NULL.
1554                          */
1555                         count = 0;
1556                         break;
1557                 }
1558                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1559                         continue;
1560                 found = sdata;
1561                 count++;
1562         }
1563
1564         if (count == 1 && ieee80211_powersave_allowed(found)) {
1565                 u8 dtimper = found->u.mgd.dtim_period;
1566                 s32 beaconint_us;
1567
1568                 beaconint_us = ieee80211_tu_to_usec(
1569                                         found->vif.bss_conf.beacon_int);
1570
1571                 timeout = local->dynamic_ps_forced_timeout;
1572                 if (timeout < 0)
1573                         timeout = 100;
1574                 local->hw.conf.dynamic_ps_timeout = timeout;
1575
1576                 /* If the TIM IE is invalid, pretend the value is 1 */
1577                 if (!dtimper)
1578                         dtimper = 1;
1579
1580                 local->hw.conf.ps_dtim_period = dtimper;
1581                 local->ps_sdata = found;
1582         } else {
1583                 local->ps_sdata = NULL;
1584         }
1585
1586         ieee80211_change_ps(local);
1587 }
1588
1589 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1590 {
1591         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1592
1593         if (sdata->vif.bss_conf.ps != ps_allowed) {
1594                 sdata->vif.bss_conf.ps = ps_allowed;
1595                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1596         }
1597 }
1598
1599 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1600 {
1601         struct ieee80211_local *local =
1602                 container_of(work, struct ieee80211_local,
1603                              dynamic_ps_disable_work);
1604
1605         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1606                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1607                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1608         }
1609
1610         ieee80211_wake_queues_by_reason(&local->hw,
1611                                         IEEE80211_MAX_QUEUE_MAP,
1612                                         IEEE80211_QUEUE_STOP_REASON_PS,
1613                                         false);
1614 }
1615
1616 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1617 {
1618         struct ieee80211_local *local =
1619                 container_of(work, struct ieee80211_local,
1620                              dynamic_ps_enable_work);
1621         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1622         struct ieee80211_if_managed *ifmgd;
1623         unsigned long flags;
1624         int q;
1625
1626         /* can only happen when PS was just disabled anyway */
1627         if (!sdata)
1628                 return;
1629
1630         ifmgd = &sdata->u.mgd;
1631
1632         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1633                 return;
1634
1635         if (local->hw.conf.dynamic_ps_timeout > 0) {
1636                 /* don't enter PS if TX frames are pending */
1637                 if (drv_tx_frames_pending(local)) {
1638                         mod_timer(&local->dynamic_ps_timer, jiffies +
1639                                   msecs_to_jiffies(
1640                                   local->hw.conf.dynamic_ps_timeout));
1641                         return;
1642                 }
1643
1644                 /*
1645                  * transmission can be stopped by others which leads to
1646                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1647                  * is not the actual idle state.
1648                  */
1649                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1650                 for (q = 0; q < local->hw.queues; q++) {
1651                         if (local->queue_stop_reasons[q]) {
1652                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1653                                                        flags);
1654                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1655                                           msecs_to_jiffies(
1656                                           local->hw.conf.dynamic_ps_timeout));
1657                                 return;
1658                         }
1659                 }
1660                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1661         }
1662
1663         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1664             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1665                 if (drv_tx_frames_pending(local)) {
1666                         mod_timer(&local->dynamic_ps_timer, jiffies +
1667                                   msecs_to_jiffies(
1668                                   local->hw.conf.dynamic_ps_timeout));
1669                 } else {
1670                         ieee80211_send_nullfunc(local, sdata, true);
1671                         /* Flush to get the tx status of nullfunc frame */
1672                         ieee80211_flush_queues(local, sdata, false);
1673                 }
1674         }
1675
1676         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1677               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1678             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1679                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1680                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1681                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1682         }
1683 }
1684
1685 void ieee80211_dynamic_ps_timer(unsigned long data)
1686 {
1687         struct ieee80211_local *local = (void *) data;
1688
1689         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1690 }
1691
1692 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1693 {
1694         struct delayed_work *delayed_work =
1695                 container_of(work, struct delayed_work, work);
1696         struct ieee80211_sub_if_data *sdata =
1697                 container_of(delayed_work, struct ieee80211_sub_if_data,
1698                              dfs_cac_timer_work);
1699         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1700
1701         mutex_lock(&sdata->local->mtx);
1702         if (sdata->wdev.cac_started) {
1703                 ieee80211_vif_release_channel(sdata);
1704                 cfg80211_cac_event(sdata->dev, &chandef,
1705                                    NL80211_RADAR_CAC_FINISHED,
1706                                    GFP_KERNEL);
1707         }
1708         mutex_unlock(&sdata->local->mtx);
1709 }
1710
1711 static bool
1712 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1713 {
1714         struct ieee80211_local *local = sdata->local;
1715         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1716         bool ret = false;
1717         int ac;
1718
1719         if (local->hw.queues < IEEE80211_NUM_ACS)
1720                 return false;
1721
1722         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1723                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1724                 int non_acm_ac;
1725                 unsigned long now = jiffies;
1726
1727                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1728                     tx_tspec->admitted_time &&
1729                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1730                         tx_tspec->consumed_tx_time = 0;
1731                         tx_tspec->time_slice_start = now;
1732
1733                         if (tx_tspec->downgraded)
1734                                 tx_tspec->action =
1735                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1736                 }
1737
1738                 switch (tx_tspec->action) {
1739                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1740                         /* take the original parameters */
1741                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1742                                 sdata_err(sdata,
1743                                           "failed to set TX queue parameters for queue %d\n",
1744                                           ac);
1745                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1746                         tx_tspec->downgraded = false;
1747                         ret = true;
1748                         break;
1749                 case TX_TSPEC_ACTION_DOWNGRADE:
1750                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1751                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1752                                 ret = true;
1753                                 break;
1754                         }
1755                         /* downgrade next lower non-ACM AC */
1756                         for (non_acm_ac = ac + 1;
1757                              non_acm_ac < IEEE80211_NUM_ACS;
1758                              non_acm_ac++)
1759                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1760                                         break;
1761                         /* The loop will result in using BK even if it requires
1762                          * admission control, such configuration makes no sense
1763                          * and we have to transmit somehow - the AC selection
1764                          * does the same thing.
1765                          */
1766                         if (drv_conf_tx(local, sdata, ac,
1767                                         &sdata->tx_conf[non_acm_ac]))
1768                                 sdata_err(sdata,
1769                                           "failed to set TX queue parameters for queue %d\n",
1770                                           ac);
1771                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1772                         ret = true;
1773                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1774                                 tx_tspec->time_slice_start + HZ - now + 1);
1775                         break;
1776                 case TX_TSPEC_ACTION_NONE:
1777                         /* nothing now */
1778                         break;
1779                 }
1780         }
1781
1782         return ret;
1783 }
1784
1785 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1786 {
1787         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1788                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1789 }
1790
1791 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1792 {
1793         struct ieee80211_sub_if_data *sdata;
1794
1795         sdata = container_of(work, struct ieee80211_sub_if_data,
1796                              u.mgd.tx_tspec_wk.work);
1797         ieee80211_sta_handle_tspec_ac_params(sdata);
1798 }
1799
1800 /* MLME */
1801 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1802                                      struct ieee80211_sub_if_data *sdata,
1803                                      const u8 *wmm_param, size_t wmm_param_len)
1804 {
1805         struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1806         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1807         size_t left;
1808         int count, ac;
1809         const u8 *pos;
1810         u8 uapsd_queues = 0;
1811
1812         if (!local->ops->conf_tx)
1813                 return false;
1814
1815         if (local->hw.queues < IEEE80211_NUM_ACS)
1816                 return false;
1817
1818         if (!wmm_param)
1819                 return false;
1820
1821         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1822                 return false;
1823
1824         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1825                 uapsd_queues = ifmgd->uapsd_queues;
1826
1827         count = wmm_param[6] & 0x0f;
1828         if (count == ifmgd->wmm_last_param_set)
1829                 return false;
1830         ifmgd->wmm_last_param_set = count;
1831
1832         pos = wmm_param + 8;
1833         left = wmm_param_len - 8;
1834
1835         memset(&params, 0, sizeof(params));
1836
1837         sdata->wmm_acm = 0;
1838         for (; left >= 4; left -= 4, pos += 4) {
1839                 int aci = (pos[0] >> 5) & 0x03;
1840                 int acm = (pos[0] >> 4) & 0x01;
1841                 bool uapsd = false;
1842
1843                 switch (aci) {
1844                 case 1: /* AC_BK */
1845                         ac = IEEE80211_AC_BK;
1846                         if (acm)
1847                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1848                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1849                                 uapsd = true;
1850                         break;
1851                 case 2: /* AC_VI */
1852                         ac = IEEE80211_AC_VI;
1853                         if (acm)
1854                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1855                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1856                                 uapsd = true;
1857                         break;
1858                 case 3: /* AC_VO */
1859                         ac = IEEE80211_AC_VO;
1860                         if (acm)
1861                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1862                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1863                                 uapsd = true;
1864                         break;
1865                 case 0: /* AC_BE */
1866                 default:
1867                         ac = IEEE80211_AC_BE;
1868                         if (acm)
1869                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1870                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1871                                 uapsd = true;
1872                         break;
1873                 }
1874
1875                 params[ac].aifs = pos[0] & 0x0f;
1876
1877                 if (params[ac].aifs < 2) {
1878                         sdata_info(sdata,
1879                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1880                                    params[ac].aifs, aci);
1881                         params[ac].aifs = 2;
1882                 }
1883                 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1884                 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1885                 params[ac].txop = get_unaligned_le16(pos + 2);
1886                 params[ac].acm = acm;
1887                 params[ac].uapsd = uapsd;
1888
1889                 if (params[ac].cw_min == 0 ||
1890                     params[ac].cw_min > params[ac].cw_max) {
1891                         sdata_info(sdata,
1892                                    "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1893                                    params[ac].cw_min, params[ac].cw_max, aci);
1894                         return false;
1895                 }
1896         }
1897
1898         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1899                 mlme_dbg(sdata,
1900                          "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1901                          ac, params[ac].acm,
1902                          params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1903                          params[ac].txop, params[ac].uapsd,
1904                          ifmgd->tx_tspec[ac].downgraded);
1905                 sdata->tx_conf[ac] = params[ac];
1906                 if (!ifmgd->tx_tspec[ac].downgraded &&
1907                     drv_conf_tx(local, sdata, ac, &params[ac]))
1908                         sdata_err(sdata,
1909                                   "failed to set TX queue parameters for AC %d\n",
1910                                   ac);
1911         }
1912
1913         /* enable WMM or activate new settings */
1914         sdata->vif.bss_conf.qos = true;
1915         return true;
1916 }
1917
1918 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1919 {
1920         lockdep_assert_held(&sdata->local->mtx);
1921
1922         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1923         ieee80211_run_deferred_scan(sdata->local);
1924 }
1925
1926 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1927 {
1928         mutex_lock(&sdata->local->mtx);
1929         __ieee80211_stop_poll(sdata);
1930         mutex_unlock(&sdata->local->mtx);
1931 }
1932
1933 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1934                                            u16 capab, bool erp_valid, u8 erp)
1935 {
1936         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1937         u32 changed = 0;
1938         bool use_protection;
1939         bool use_short_preamble;
1940         bool use_short_slot;
1941
1942         if (erp_valid) {
1943                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1944                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1945         } else {
1946                 use_protection = false;
1947                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1948         }
1949
1950         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1951         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1952                 use_short_slot = true;
1953
1954         if (use_protection != bss_conf->use_cts_prot) {
1955                 bss_conf->use_cts_prot = use_protection;
1956                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1957         }
1958
1959         if (use_short_preamble != bss_conf->use_short_preamble) {
1960                 bss_conf->use_short_preamble = use_short_preamble;
1961                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1962         }
1963
1964         if (use_short_slot != bss_conf->use_short_slot) {
1965                 bss_conf->use_short_slot = use_short_slot;
1966                 changed |= BSS_CHANGED_ERP_SLOT;
1967         }
1968
1969         return changed;
1970 }
1971
1972 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1973                                      struct cfg80211_bss *cbss,
1974                                      u32 bss_info_changed)
1975 {
1976         struct ieee80211_bss *bss = (void *)cbss->priv;
1977         struct ieee80211_local *local = sdata->local;
1978         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1979
1980         bss_info_changed |= BSS_CHANGED_ASSOC;
1981         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1982                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1983
1984         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1985                 beacon_loss_count * bss_conf->beacon_int));
1986
1987         sdata->u.mgd.associated = cbss;
1988         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1989
1990         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1991
1992         if (sdata->vif.p2p) {
1993                 const struct cfg80211_bss_ies *ies;
1994
1995                 rcu_read_lock();
1996                 ies = rcu_dereference(cbss->ies);
1997                 if (ies) {
1998                         int ret;
1999
2000                         ret = cfg80211_get_p2p_attr(
2001                                         ies->data, ies->len,
2002                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2003                                         (u8 *) &bss_conf->p2p_noa_attr,
2004                                         sizeof(bss_conf->p2p_noa_attr));
2005                         if (ret >= 2) {
2006                                 sdata->u.mgd.p2p_noa_index =
2007                                         bss_conf->p2p_noa_attr.index;
2008                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
2009                         }
2010                 }
2011                 rcu_read_unlock();
2012         }
2013
2014         /* just to be sure */
2015         ieee80211_stop_poll(sdata);
2016
2017         ieee80211_led_assoc(local, 1);
2018
2019         if (sdata->u.mgd.have_beacon) {
2020                 /*
2021                  * If the AP is buggy we may get here with no DTIM period
2022                  * known, so assume it's 1 which is the only safe assumption
2023                  * in that case, although if the TIM IE is broken powersave
2024                  * probably just won't work at all.
2025                  */
2026                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
2027                 bss_conf->beacon_rate = bss->beacon_rate;
2028                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
2029         } else {
2030                 bss_conf->beacon_rate = NULL;
2031                 bss_conf->dtim_period = 0;
2032         }
2033
2034         bss_conf->assoc = 1;
2035
2036         /* Tell the driver to monitor connection quality (if supported) */
2037         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
2038             bss_conf->cqm_rssi_thold)
2039                 bss_info_changed |= BSS_CHANGED_CQM;
2040
2041         /* Enable ARP filtering */
2042         if (bss_conf->arp_addr_cnt)
2043                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
2044
2045         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
2046
2047         mutex_lock(&local->iflist_mtx);
2048         ieee80211_recalc_ps(local);
2049         mutex_unlock(&local->iflist_mtx);
2050
2051         ieee80211_recalc_smps(sdata);
2052         ieee80211_recalc_ps_vif(sdata);
2053
2054         netif_carrier_on(sdata->dev);
2055 }
2056
2057 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2058                                    u16 stype, u16 reason, bool tx,
2059                                    u8 *frame_buf)
2060 {
2061         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2062         struct ieee80211_local *local = sdata->local;
2063         u32 changed = 0;
2064
2065         sdata_assert_lock(sdata);
2066
2067         if (WARN_ON_ONCE(tx && !frame_buf))
2068                 return;
2069
2070         if (WARN_ON(!ifmgd->associated))
2071                 return;
2072
2073         ieee80211_stop_poll(sdata);
2074
2075         ifmgd->associated = NULL;
2076         netif_carrier_off(sdata->dev);
2077
2078         /*
2079          * if we want to get out of ps before disassoc (why?) we have
2080          * to do it before sending disassoc, as otherwise the null-packet
2081          * won't be valid.
2082          */
2083         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2084                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2085                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2086         }
2087         local->ps_sdata = NULL;
2088
2089         /* disable per-vif ps */
2090         ieee80211_recalc_ps_vif(sdata);
2091
2092         /* make sure ongoing transmission finishes */
2093         synchronize_net();
2094
2095         /*
2096          * drop any frame before deauth/disassoc, this can be data or
2097          * management frame. Since we are disconnecting, we should not
2098          * insist sending these frames which can take time and delay
2099          * the disconnection and possible the roaming.
2100          */
2101         if (tx)
2102                 ieee80211_flush_queues(local, sdata, true);
2103
2104         /* deauthenticate/disassociate now */
2105         if (tx || frame_buf)
2106                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2107                                                reason, tx, frame_buf);
2108
2109         /* flush out frame - make sure the deauth was actually sent */
2110         if (tx)
2111                 ieee80211_flush_queues(local, sdata, false);
2112
2113         /* clear bssid only after building the needed mgmt frames */
2114         eth_zero_addr(ifmgd->bssid);
2115
2116         /* remove AP and TDLS peers */
2117         sta_info_flush(sdata);
2118
2119         /* finally reset all BSS / config parameters */
2120         changed |= ieee80211_reset_erp_info(sdata);
2121
2122         ieee80211_led_assoc(local, 0);
2123         changed |= BSS_CHANGED_ASSOC;
2124         sdata->vif.bss_conf.assoc = false;
2125
2126         ifmgd->p2p_noa_index = -1;
2127         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2128                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2129
2130         /* on the next assoc, re-program HT/VHT parameters */
2131         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2132         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2133         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2134         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2135         sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2136
2137         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2138
2139         del_timer_sync(&local->dynamic_ps_timer);
2140         cancel_work_sync(&local->dynamic_ps_enable_work);
2141
2142         /* Disable ARP filtering */
2143         if (sdata->vif.bss_conf.arp_addr_cnt)
2144                 changed |= BSS_CHANGED_ARP_FILTER;
2145
2146         sdata->vif.bss_conf.qos = false;
2147         changed |= BSS_CHANGED_QOS;
2148
2149         /* The BSSID (not really interesting) and HT changed */
2150         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2151         ieee80211_bss_info_change_notify(sdata, changed);
2152
2153         /* disassociated - set to defaults now */
2154         ieee80211_set_wmm_default(sdata, false, false);
2155
2156         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2157         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2158         del_timer_sync(&sdata->u.mgd.timer);
2159         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2160
2161         sdata->vif.bss_conf.dtim_period = 0;
2162         sdata->vif.bss_conf.beacon_rate = NULL;
2163
2164         ifmgd->have_beacon = false;
2165
2166         ifmgd->flags = 0;
2167         mutex_lock(&local->mtx);
2168         ieee80211_vif_release_channel(sdata);
2169
2170         sdata->vif.csa_active = false;
2171         ifmgd->csa_waiting_bcn = false;
2172         ifmgd->csa_ignored_same_chan = false;
2173         if (sdata->csa_block_tx) {
2174                 ieee80211_wake_vif_queues(local, sdata,
2175                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2176                 sdata->csa_block_tx = false;
2177         }
2178         mutex_unlock(&local->mtx);
2179
2180         /* existing TX TSPEC sessions no longer exist */
2181         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2182         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2183
2184         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2185 }
2186
2187 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2188                              struct ieee80211_hdr *hdr)
2189 {
2190         /*
2191          * We can postpone the mgd.timer whenever receiving unicast frames
2192          * from AP because we know that the connection is working both ways
2193          * at that time. But multicast frames (and hence also beacons) must
2194          * be ignored here, because we need to trigger the timer during
2195          * data idle periods for sending the periodic probe request to the
2196          * AP we're connected to.
2197          */
2198         if (is_multicast_ether_addr(hdr->addr1))
2199                 return;
2200
2201         ieee80211_sta_reset_conn_monitor(sdata);
2202 }
2203
2204 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2205 {
2206         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2207         struct ieee80211_local *local = sdata->local;
2208
2209         mutex_lock(&local->mtx);
2210         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2211                 goto out;
2212
2213         __ieee80211_stop_poll(sdata);
2214
2215         mutex_lock(&local->iflist_mtx);
2216         ieee80211_recalc_ps(local);
2217         mutex_unlock(&local->iflist_mtx);
2218
2219         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2220                 goto out;
2221
2222         /*
2223          * We've received a probe response, but are not sure whether
2224          * we have or will be receiving any beacons or data, so let's
2225          * schedule the timers again, just in case.
2226          */
2227         ieee80211_sta_reset_beacon_monitor(sdata);
2228
2229         mod_timer(&ifmgd->conn_mon_timer,
2230                   round_jiffies_up(jiffies +
2231                                    IEEE80211_CONNECTION_IDLE_TIME));
2232 out:
2233         mutex_unlock(&local->mtx);
2234 }
2235
2236 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2237                                            struct ieee80211_hdr *hdr,
2238                                            u16 tx_time)
2239 {
2240         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2241         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2242         int ac = ieee80211_ac_from_tid(tid);
2243         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2244         unsigned long now = jiffies;
2245
2246         if (likely(!tx_tspec->admitted_time))
2247                 return;
2248
2249         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2250                 tx_tspec->consumed_tx_time = 0;
2251                 tx_tspec->time_slice_start = now;
2252
2253                 if (tx_tspec->downgraded) {
2254                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2255                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2256                 }
2257         }
2258
2259         if (tx_tspec->downgraded)
2260                 return;
2261
2262         tx_tspec->consumed_tx_time += tx_time;
2263
2264         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2265                 tx_tspec->downgraded = true;
2266                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2267                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2268         }
2269 }
2270
2271 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2272                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2273 {
2274         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2275
2276         if (!ieee80211_is_data(hdr->frame_control))
2277             return;
2278
2279         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2280             sdata->u.mgd.probe_send_count > 0) {
2281                 if (ack)
2282                         ieee80211_sta_reset_conn_monitor(sdata);
2283                 else
2284                         sdata->u.mgd.nullfunc_failed = true;
2285                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2286                 return;
2287         }
2288
2289         if (ack)
2290                 ieee80211_sta_reset_conn_monitor(sdata);
2291 }
2292
2293 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2294 {
2295         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2296         const u8 *ssid;
2297         u8 *dst = ifmgd->associated->bssid;
2298         u8 unicast_limit = max(1, max_probe_tries - 3);
2299
2300         /*
2301          * Try sending broadcast probe requests for the last three
2302          * probe requests after the first ones failed since some
2303          * buggy APs only support broadcast probe requests.
2304          */
2305         if (ifmgd->probe_send_count >= unicast_limit)
2306                 dst = NULL;
2307
2308         /*
2309          * When the hardware reports an accurate Tx ACK status, it's
2310          * better to send a nullfunc frame instead of a probe request,
2311          * as it will kick us off the AP quickly if we aren't associated
2312          * anymore. The timeout will be reset if the frame is ACKed by
2313          * the AP.
2314          */
2315         ifmgd->probe_send_count++;
2316
2317         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2318                 ifmgd->nullfunc_failed = false;
2319                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2320         } else {
2321                 int ssid_len;
2322
2323                 rcu_read_lock();
2324                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2325                 if (WARN_ON_ONCE(ssid == NULL))
2326                         ssid_len = 0;
2327                 else
2328                         ssid_len = ssid[1];
2329
2330                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2331                                          ssid + 2, ssid_len, NULL,
2332                                          0, (u32) -1, true, 0,
2333                                          ifmgd->associated->channel, false);
2334                 rcu_read_unlock();
2335         }
2336
2337         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2338         run_again(sdata, ifmgd->probe_timeout);
2339 }
2340
2341 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2342                                    bool beacon)
2343 {
2344         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2345         bool already = false;
2346
2347         if (!ieee80211_sdata_running(sdata))
2348                 return;
2349
2350         sdata_lock(sdata);
2351
2352         if (!ifmgd->associated)
2353                 goto out;
2354
2355         mutex_lock(&sdata->local->mtx);
2356
2357         if (sdata->local->tmp_channel || sdata->local->scanning) {
2358                 mutex_unlock(&sdata->local->mtx);
2359                 goto out;
2360         }
2361
2362         if (beacon) {
2363                 mlme_dbg_ratelimited(sdata,
2364                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2365                                      beacon_loss_count);
2366
2367                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2368         }
2369
2370         /*
2371          * The driver/our work has already reported this event or the
2372          * connection monitoring has kicked in and we have already sent
2373          * a probe request. Or maybe the AP died and the driver keeps
2374          * reporting until we disassociate...
2375          *
2376          * In either case we have to ignore the current call to this
2377          * function (except for setting the correct probe reason bit)
2378          * because otherwise we would reset the timer every time and
2379          * never check whether we received a probe response!
2380          */
2381         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2382                 already = true;
2383
2384         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2385
2386         mutex_unlock(&sdata->local->mtx);
2387
2388         if (already)
2389                 goto out;
2390
2391         mutex_lock(&sdata->local->iflist_mtx);
2392         ieee80211_recalc_ps(sdata->local);
2393         mutex_unlock(&sdata->local->iflist_mtx);
2394
2395         ifmgd->probe_send_count = 0;
2396         ieee80211_mgd_probe_ap_send(sdata);
2397  out:
2398         sdata_unlock(sdata);
2399 }
2400
2401 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2402                                           struct ieee80211_vif *vif)
2403 {
2404         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2405         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2406         struct cfg80211_bss *cbss;
2407         struct sk_buff *skb;
2408         const u8 *ssid;
2409         int ssid_len;
2410
2411         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2412                 return NULL;
2413
2414         sdata_assert_lock(sdata);
2415
2416         if (ifmgd->associated)
2417                 cbss = ifmgd->associated;
2418         else if (ifmgd->auth_data)
2419                 cbss = ifmgd->auth_data->bss;
2420         else if (ifmgd->assoc_data)
2421                 cbss = ifmgd->assoc_data->bss;
2422         else
2423                 return NULL;
2424
2425         rcu_read_lock();
2426         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2427         if (WARN_ON_ONCE(ssid == NULL))
2428                 ssid_len = 0;
2429         else
2430                 ssid_len = ssid[1];
2431
2432         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2433                                         (u32) -1, cbss->channel,
2434                                         ssid + 2, ssid_len,
2435                                         NULL, 0, true);
2436         rcu_read_unlock();
2437
2438         return skb;
2439 }
2440 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2441
2442 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2443                                         const u8 *buf, size_t len, bool tx,
2444                                         u16 reason)
2445 {
2446         struct ieee80211_event event = {
2447                 .type = MLME_EVENT,
2448                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2449                 .u.mlme.reason = reason,
2450         };
2451
2452         if (tx)
2453                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2454         else
2455                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2456
2457         drv_event_callback(sdata->local, sdata, &event);
2458 }
2459
2460 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2461 {
2462         struct ieee80211_local *local = sdata->local;
2463         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2464         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2465
2466         sdata_lock(sdata);
2467         if (!ifmgd->associated) {
2468                 sdata_unlock(sdata);
2469                 return;
2470         }
2471
2472         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2473                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2474                                true, frame_buf);
2475         mutex_lock(&local->mtx);
2476         sdata->vif.csa_active = false;
2477         ifmgd->csa_waiting_bcn = false;
2478         if (sdata->csa_block_tx) {
2479                 ieee80211_wake_vif_queues(local, sdata,
2480                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2481                 sdata->csa_block_tx = false;
2482         }
2483         mutex_unlock(&local->mtx);
2484
2485         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2486                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2487
2488         sdata_unlock(sdata);
2489 }
2490
2491 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2492 {
2493         struct ieee80211_sub_if_data *sdata =
2494                 container_of(work, struct ieee80211_sub_if_data,
2495                              u.mgd.beacon_connection_loss_work);
2496         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2497
2498         if (ifmgd->associated)
2499                 ifmgd->beacon_loss_count++;
2500
2501         if (ifmgd->connection_loss) {
2502                 sdata_info(sdata, "Connection to AP %pM lost\n",
2503                            ifmgd->bssid);
2504                 __ieee80211_disconnect(sdata);
2505         } else {
2506                 ieee80211_mgd_probe_ap(sdata, true);
2507         }
2508 }
2509
2510 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2511 {
2512         struct ieee80211_sub_if_data *sdata =
2513                 container_of(work, struct ieee80211_sub_if_data,
2514                              u.mgd.csa_connection_drop_work);
2515
2516         __ieee80211_disconnect(sdata);
2517 }
2518
2519 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2520 {
2521         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2522         struct ieee80211_hw *hw = &sdata->local->hw;
2523
2524         trace_api_beacon_loss(sdata);
2525
2526         sdata->u.mgd.connection_loss = false;
2527         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2528 }
2529 EXPORT_SYMBOL(ieee80211_beacon_loss);
2530
2531 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2532 {
2533         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2534         struct ieee80211_hw *hw = &sdata->local->hw;
2535
2536         trace_api_connection_loss(sdata);
2537
2538         sdata->u.mgd.connection_loss = true;
2539         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2540 }
2541 EXPORT_SYMBOL(ieee80211_connection_loss);
2542
2543
2544 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2545                                         bool assoc)
2546 {
2547         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2548
2549         sdata_assert_lock(sdata);
2550
2551         if (!assoc) {
2552                 /*
2553                  * we are not authenticated yet, the only timer that could be
2554                  * running is the timeout for the authentication response which
2555                  * which is not relevant anymore.
2556                  */
2557                 del_timer_sync(&sdata->u.mgd.timer);
2558                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2559
2560                 eth_zero_addr(sdata->u.mgd.bssid);
2561                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2562                 sdata->u.mgd.flags = 0;
2563                 mutex_lock(&sdata->local->mtx);
2564                 ieee80211_vif_release_channel(sdata);
2565                 mutex_unlock(&sdata->local->mtx);
2566         }
2567
2568         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2569         kfree(auth_data);
2570         sdata->u.mgd.auth_data = NULL;
2571 }
2572
2573 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2574                                          bool assoc, bool abandon)
2575 {
2576         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2577
2578         sdata_assert_lock(sdata);
2579
2580         if (!assoc) {
2581                 /*
2582                  * we are not associated yet, the only timer that could be
2583                  * running is the timeout for the association response which
2584                  * which is not relevant anymore.
2585                  */
2586                 del_timer_sync(&sdata->u.mgd.timer);
2587                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2588
2589                 eth_zero_addr(sdata->u.mgd.bssid);
2590                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2591                 sdata->u.mgd.flags = 0;
2592                 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2593                 mutex_lock(&sdata->local->mtx);
2594                 ieee80211_vif_release_channel(sdata);
2595                 mutex_unlock(&sdata->local->mtx);
2596
2597                 if (abandon)
2598                         cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2599         }
2600
2601         kfree(assoc_data);
2602         sdata->u.mgd.assoc_data = NULL;
2603 }
2604
2605 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2606                                      struct ieee80211_mgmt *mgmt, size_t len)
2607 {
2608         struct ieee80211_local *local = sdata->local;
2609         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2610         u8 *pos;
2611         struct ieee802_11_elems elems;
2612         u32 tx_flags = 0;
2613
2614         pos = mgmt->u.auth.variable;
2615         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2616         if (!elems.challenge)
2617                 return;
2618         auth_data->expected_transaction = 4;
2619         drv_mgd_prepare_tx(sdata->local, sdata);
2620         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2621                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2622                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2623         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2624                             elems.challenge - 2, elems.challenge_len + 2,
2625                             auth_data->bss->bssid, auth_data->bss->bssid,
2626                             auth_data->key, auth_data->key_len,
2627                             auth_data->key_idx, tx_flags);
2628 }
2629
2630 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2631                                    struct ieee80211_mgmt *mgmt, size_t len)
2632 {
2633         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2634         u8 bssid[ETH_ALEN];
2635         u16 auth_alg, auth_transaction, status_code;
2636         struct sta_info *sta;
2637         struct ieee80211_event event = {
2638                 .type = MLME_EVENT,
2639                 .u.mlme.data = AUTH_EVENT,
2640         };
2641
2642         sdata_assert_lock(sdata);
2643
2644         if (len < 24 + 6)
2645                 return;
2646
2647         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2648                 return;
2649
2650         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2651
2652         if (!ether_addr_equal(bssid, mgmt->bssid))
2653                 return;
2654
2655         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2656         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2657         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2658
2659         if (auth_alg != ifmgd->auth_data->algorithm ||
2660             auth_transaction != ifmgd->auth_data->expected_transaction) {
2661                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2662                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2663                            auth_transaction,
2664                            ifmgd->auth_data->expected_transaction);
2665                 return;
2666         }
2667
2668         if (status_code != WLAN_STATUS_SUCCESS) {
2669                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2670                            mgmt->sa, status_code);
2671                 ieee80211_destroy_auth_data(sdata, false);
2672                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2673                 event.u.mlme.status = MLME_DENIED;
2674                 event.u.mlme.reason = status_code;
2675                 drv_event_callback(sdata->local, sdata, &event);
2676                 return;
2677         }
2678
2679         switch (ifmgd->auth_data->algorithm) {
2680         case WLAN_AUTH_OPEN:
2681         case WLAN_AUTH_LEAP:
2682         case WLAN_AUTH_FT:
2683         case WLAN_AUTH_SAE:
2684                 break;
2685         case WLAN_AUTH_SHARED_KEY:
2686                 if (ifmgd->auth_data->expected_transaction != 4) {
2687                         ieee80211_auth_challenge(sdata, mgmt, len);
2688                         /* need another frame */
2689                         return;
2690                 }
2691                 break;
2692         default:
2693                 WARN_ONCE(1, "invalid auth alg %d",
2694                           ifmgd->auth_data->algorithm);
2695                 return;
2696         }
2697
2698         event.u.mlme.status = MLME_SUCCESS;
2699         drv_event_callback(sdata->local, sdata, &event);
2700         sdata_info(sdata, "authenticated\n");
2701         ifmgd->auth_data->done = true;
2702         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2703         ifmgd->auth_data->timeout_started = true;
2704         run_again(sdata, ifmgd->auth_data->timeout);
2705
2706         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2707             ifmgd->auth_data->expected_transaction != 2) {
2708                 /*
2709                  * Report auth frame to user space for processing since another
2710                  * round of Authentication frames is still needed.
2711                  */
2712                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2713                 return;
2714         }
2715
2716         /* move station state to auth */
2717         mutex_lock(&sdata->local->sta_mtx);
2718         sta = sta_info_get(sdata, bssid);
2719         if (!sta) {
2720                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2721                 goto out_err;
2722         }
2723         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2724                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2725                 goto out_err;
2726         }
2727         mutex_unlock(&sdata->local->sta_mtx);
2728
2729         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2730         return;
2731  out_err:
2732         mutex_unlock(&sdata->local->sta_mtx);
2733         /* ignore frame -- wait for timeout */
2734 }
2735
2736 #define case_WLAN(type) \
2737         case WLAN_REASON_##type: return #type
2738
2739 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2740 {
2741         switch (reason_code) {
2742         case_WLAN(UNSPECIFIED);
2743         case_WLAN(PREV_AUTH_NOT_VALID);
2744         case_WLAN(DEAUTH_LEAVING);
2745         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2746         case_WLAN(DISASSOC_AP_BUSY);
2747         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2748         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2749         case_WLAN(DISASSOC_STA_HAS_LEFT);
2750         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2751         case_WLAN(DISASSOC_BAD_POWER);
2752         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2753         case_WLAN(INVALID_IE);
2754         case_WLAN(MIC_FAILURE);
2755         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2756         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2757         case_WLAN(IE_DIFFERENT);
2758         case_WLAN(INVALID_GROUP_CIPHER);
2759         case_WLAN(INVALID_PAIRWISE_CIPHER);
2760         case_WLAN(INVALID_AKMP);
2761         case_WLAN(UNSUPP_RSN_VERSION);
2762         case_WLAN(INVALID_RSN_IE_CAP);
2763         case_WLAN(IEEE8021X_FAILED);
2764         case_WLAN(CIPHER_SUITE_REJECTED);
2765         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2766         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2767         case_WLAN(DISASSOC_LOW_ACK);
2768         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2769         case_WLAN(QSTA_LEAVE_QBSS);
2770         case_WLAN(QSTA_NOT_USE);
2771         case_WLAN(QSTA_REQUIRE_SETUP);
2772         case_WLAN(QSTA_TIMEOUT);
2773         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2774         case_WLAN(MESH_PEER_CANCELED);
2775         case_WLAN(MESH_MAX_PEERS);
2776         case_WLAN(MESH_CONFIG);
2777         case_WLAN(MESH_CLOSE);
2778         case_WLAN(MESH_MAX_RETRIES);
2779         case_WLAN(MESH_CONFIRM_TIMEOUT);
2780         case_WLAN(MESH_INVALID_GTK);
2781         case_WLAN(MESH_INCONSISTENT_PARAM);
2782         case_WLAN(MESH_INVALID_SECURITY);
2783         case_WLAN(MESH_PATH_ERROR);
2784         case_WLAN(MESH_PATH_NOFORWARD);
2785         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2786         case_WLAN(MAC_EXISTS_IN_MBSS);
2787         case_WLAN(MESH_CHAN_REGULATORY);
2788         case_WLAN(MESH_CHAN);
2789         default: return "<unknown>";
2790         }
2791 }
2792
2793 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2794                                      struct ieee80211_mgmt *mgmt, size_t len)
2795 {
2796         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2797         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2798
2799         sdata_assert_lock(sdata);
2800
2801         if (len < 24 + 2)
2802                 return;
2803
2804         if (ifmgd->associated &&
2805             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2806                 const u8 *bssid = ifmgd->associated->bssid;
2807
2808                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2809                            bssid, reason_code,
2810                            ieee80211_get_reason_code_string(reason_code));
2811
2812                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2813
2814                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2815                                             reason_code);
2816                 return;
2817         }
2818
2819         if (ifmgd->assoc_data &&
2820             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2821                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2822
2823                 sdata_info(sdata,
2824                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2825                            bssid, reason_code,
2826                            ieee80211_get_reason_code_string(reason_code));
2827
2828                 ieee80211_destroy_assoc_data(sdata, false, true);
2829
2830                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2831                 return;
2832         }
2833 }
2834
2835
2836 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2837                                        struct ieee80211_mgmt *mgmt, size_t len)
2838 {
2839         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2840         u16 reason_code;
2841
2842         sdata_assert_lock(sdata);
2843
2844         if (len < 24 + 2)
2845                 return;
2846
2847         if (!ifmgd->associated ||
2848             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2849                 return;
2850
2851         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2852
2853         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2854                    mgmt->sa, reason_code);
2855
2856         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2857
2858         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2859 }
2860
2861 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2862                                 u8 *supp_rates, unsigned int supp_rates_len,
2863                                 u32 *rates, u32 *basic_rates,
2864                                 bool *have_higher_than_11mbit,
2865                                 int *min_rate, int *min_rate_index,
2866                                 int shift, u32 rate_flags)
2867 {
2868         int i, j;
2869
2870         for (i = 0; i < supp_rates_len; i++) {
2871                 int rate = supp_rates[i] & 0x7f;
2872                 bool is_basic = !!(supp_rates[i] & 0x80);
2873
2874                 if ((rate * 5 * (1 << shift)) > 110)
2875                         *have_higher_than_11mbit = true;
2876
2877                 /*
2878                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2879                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2880                  *
2881                  * Note: Even through the membership selector and the basic
2882                  *       rate flag share the same bit, they are not exactly
2883                  *       the same.
2884                  */
2885                 if (!!(supp_rates[i] & 0x80) &&
2886                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2887                         continue;
2888
2889                 for (j = 0; j < sband->n_bitrates; j++) {
2890                         struct ieee80211_rate *br;
2891                         int brate;
2892
2893                         br = &sband->bitrates[j];
2894                         if ((rate_flags & br->flags) != rate_flags)
2895                                 continue;
2896
2897                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2898                         if (brate == rate) {
2899                                 *rates |= BIT(j);
2900                                 if (is_basic)
2901                                         *basic_rates |= BIT(j);
2902                                 if ((rate * 5) < *min_rate) {
2903                                         *min_rate = rate * 5;
2904                                         *min_rate_index = j;
2905                                 }
2906                                 break;
2907                         }
2908                 }
2909         }
2910 }
2911
2912 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2913                                     struct cfg80211_bss *cbss,
2914                                     struct ieee80211_mgmt *mgmt, size_t len)
2915 {
2916         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2917         struct ieee80211_local *local = sdata->local;
2918         struct ieee80211_supported_band *sband;
2919         struct sta_info *sta;
2920         u8 *pos;
2921         u16 capab_info, aid;
2922         struct ieee802_11_elems elems;
2923         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2924         const struct cfg80211_bss_ies *bss_ies = NULL;
2925         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2926         u32 changed = 0;
2927         int err;
2928         bool ret;
2929
2930         /* AssocResp and ReassocResp have identical structure */
2931
2932         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2933         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2934
2935         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2936                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2937                            aid);
2938         aid &= ~(BIT(15) | BIT(14));
2939
2940         ifmgd->broken_ap = false;
2941
2942         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2943                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2944                            aid);
2945                 aid = 0;
2946                 ifmgd->broken_ap = true;
2947         }
2948
2949         pos = mgmt->u.assoc_resp.variable;
2950         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2951
2952         if (!elems.supp_rates) {
2953                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2954                 return false;
2955         }
2956
2957         ifmgd->aid = aid;
2958         ifmgd->tdls_chan_switch_prohibited =
2959                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2960                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2961
2962         /*
2963          * Some APs are erroneously not including some information in their
2964          * (re)association response frames. Try to recover by using the data
2965          * from the beacon or probe response. This seems to afflict mobile
2966          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2967          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2968          */
2969         if ((assoc_data->wmm && !elems.wmm_param) ||
2970             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2971              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2972             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2973              (!elems.vht_cap_elem || !elems.vht_operation))) {
2974                 const struct cfg80211_bss_ies *ies;
2975                 struct ieee802_11_elems bss_elems;
2976
2977                 rcu_read_lock();
2978                 ies = rcu_dereference(cbss->ies);
2979                 if (ies)
2980                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2981                                           GFP_ATOMIC);
2982                 rcu_read_unlock();
2983                 if (!bss_ies)
2984                         return false;
2985
2986                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2987                                        false, &bss_elems);
2988                 if (assoc_data->wmm &&
2989                     !elems.wmm_param && bss_elems.wmm_param) {
2990                         elems.wmm_param = bss_elems.wmm_param;
2991                         sdata_info(sdata,
2992                                    "AP bug: WMM param missing from AssocResp\n");
2993                 }
2994
2995                 /*
2996                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2997                  * have to include the IEs in the (re)association response.
2998                  */
2999                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
3000                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
3001                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
3002                         sdata_info(sdata,
3003                                    "AP bug: HT capability missing from AssocResp\n");
3004                 }
3005                 if (!elems.ht_operation && bss_elems.ht_operation &&
3006                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
3007                         elems.ht_operation = bss_elems.ht_operation;
3008                         sdata_info(sdata,
3009                                    "AP bug: HT operation missing from AssocResp\n");
3010                 }
3011                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
3012                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
3013                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
3014                         sdata_info(sdata,
3015                                    "AP bug: VHT capa missing from AssocResp\n");
3016                 }
3017                 if (!elems.vht_operation && bss_elems.vht_operation &&
3018                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
3019                         elems.vht_operation = bss_elems.vht_operation;
3020                         sdata_info(sdata,
3021                                    "AP bug: VHT operation missing from AssocResp\n");
3022                 }
3023         }
3024
3025         /*
3026          * We previously checked these in the beacon/probe response, so
3027          * they should be present here. This is just a safety net.
3028          */
3029         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3030             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
3031                 sdata_info(sdata,
3032                            "HT AP is missing WMM params or HT capability/operation\n");
3033                 ret = false;
3034                 goto out;
3035         }
3036
3037         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3038             (!elems.vht_cap_elem || !elems.vht_operation)) {
3039                 sdata_info(sdata,
3040                            "VHT AP is missing VHT capability/operation\n");
3041                 ret = false;
3042                 goto out;
3043         }
3044
3045         mutex_lock(&sdata->local->sta_mtx);
3046         /*
3047          * station info was already allocated and inserted before
3048          * the association and should be available to us
3049          */
3050         sta = sta_info_get(sdata, cbss->bssid);
3051         if (WARN_ON(!sta)) {
3052                 mutex_unlock(&sdata->local->sta_mtx);
3053                 ret = false;
3054                 goto out;
3055         }
3056
3057         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
3058
3059         /* Set up internal HT/VHT capabilities */
3060         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3061                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3062                                                   elems.ht_cap_elem, sta);
3063
3064         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3065                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3066                                                     elems.vht_cap_elem, sta);
3067
3068         /*
3069          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3070          * in their association response, so ignore that data for our own
3071          * configuration. If it changed since the last beacon, we'll get the
3072          * next beacon and update then.
3073          */
3074
3075         /*
3076          * If an operating mode notification IE is present, override the
3077          * NSS calculation (that would be done in rate_control_rate_init())
3078          * and use the # of streams from that element.
3079          */
3080         if (elems.opmode_notif &&
3081             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3082                 u8 nss;
3083
3084                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3085                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3086                 nss += 1;
3087                 sta->sta.rx_nss = nss;
3088         }
3089
3090         rate_control_rate_init(sta);
3091
3092         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3093                 set_sta_flag(sta, WLAN_STA_MFP);
3094                 sta->sta.mfp = true;
3095         } else {
3096                 sta->sta.mfp = false;
3097         }
3098
3099         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3100
3101         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3102         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3103                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3104         if (err) {
3105                 sdata_info(sdata,
3106                            "failed to move station %pM to desired state\n",
3107                            sta->sta.addr);
3108                 WARN_ON(__sta_info_destroy(sta));
3109                 mutex_unlock(&sdata->local->sta_mtx);
3110                 ret = false;
3111                 goto out;
3112         }
3113
3114         mutex_unlock(&sdata->local->sta_mtx);
3115
3116         /*
3117          * Always handle WMM once after association regardless
3118          * of the first value the AP uses. Setting -1 here has
3119          * that effect because the AP values is an unsigned
3120          * 4-bit value.
3121          */
3122         ifmgd->wmm_last_param_set = -1;
3123
3124         if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3125                 ieee80211_set_wmm_default(sdata, false, false);
3126         } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3127                                              elems.wmm_param_len)) {
3128                 /* still enable QoS since we might have HT/VHT */
3129                 ieee80211_set_wmm_default(sdata, false, true);
3130                 /* set the disable-WMM flag in this case to disable
3131                  * tracking WMM parameter changes in the beacon if
3132                  * the parameters weren't actually valid. Doing so
3133                  * avoids changing parameters very strangely when
3134                  * the AP is going back and forth between valid and
3135                  * invalid parameters.
3136                  */
3137                 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3138         }
3139         changed |= BSS_CHANGED_QOS;
3140
3141         /* set AID and assoc capability,
3142          * ieee80211_set_associated() will tell the driver */
3143         bss_conf->aid = aid;
3144         bss_conf->assoc_capability = capab_info;
3145         ieee80211_set_associated(sdata, cbss, changed);
3146
3147         /*
3148          * If we're using 4-addr mode, let the AP know that we're
3149          * doing so, so that it can create the STA VLAN on its side
3150          */
3151         if (ifmgd->use_4addr)
3152                 ieee80211_send_4addr_nullfunc(local, sdata);
3153
3154         /*
3155          * Start timer to probe the connection to the AP now.
3156          * Also start the timer that will detect beacon loss.
3157          */
3158         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3159         ieee80211_sta_reset_beacon_monitor(sdata);
3160
3161         ret = true;
3162  out:
3163         kfree(bss_ies);
3164         return ret;
3165 }
3166
3167 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3168                                          struct ieee80211_mgmt *mgmt,
3169                                          size_t len)
3170 {
3171         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3172         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3173         u16 capab_info, status_code, aid;
3174         struct ieee802_11_elems elems;
3175         int ac, uapsd_queues = -1;
3176         u8 *pos;
3177         bool reassoc;
3178         struct cfg80211_bss *bss;
3179         struct ieee80211_event event = {
3180                 .type = MLME_EVENT,
3181                 .u.mlme.data = ASSOC_EVENT,
3182         };
3183
3184         sdata_assert_lock(sdata);
3185
3186         if (!assoc_data)
3187                 return;
3188         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3189                 return;
3190
3191         /*
3192          * AssocResp and ReassocResp have identical structure, so process both
3193          * of them in this function.
3194          */
3195
3196         if (len < 24 + 6)
3197                 return;
3198
3199         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3200         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3201         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3202         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3203
3204         sdata_info(sdata,
3205                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3206                    reassoc ? "Rea" : "A", mgmt->sa,
3207                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3208
3209         pos = mgmt->u.assoc_resp.variable;
3210         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3211
3212         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3213             elems.timeout_int &&
3214             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3215                 u32 tu, ms;
3216                 tu = le32_to_cpu(elems.timeout_int->value);
3217                 ms = tu * 1024 / 1000;
3218                 sdata_info(sdata,
3219                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3220                            mgmt->sa, tu, ms);
3221                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3222                 assoc_data->timeout_started = true;
3223                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3224                         run_again(sdata, assoc_data->timeout);
3225                 return;
3226         }
3227
3228         bss = assoc_data->bss;
3229
3230         if (status_code != WLAN_STATUS_SUCCESS) {
3231                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3232                            mgmt->sa, status_code);
3233                 ieee80211_destroy_assoc_data(sdata, false, false);
3234                 event.u.mlme.status = MLME_DENIED;
3235                 event.u.mlme.reason = status_code;
3236                 drv_event_callback(sdata->local, sdata, &event);
3237         } else {
3238                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3239                         /* oops -- internal error -- send timeout for now */
3240                         ieee80211_destroy_assoc_data(sdata, false, false);
3241                         cfg80211_assoc_timeout(sdata->dev, bss);
3242                         return;
3243                 }
3244                 event.u.mlme.status = MLME_SUCCESS;
3245                 drv_event_callback(sdata->local, sdata, &event);
3246                 sdata_info(sdata, "associated\n");
3247
3248                 /*
3249                  * destroy assoc_data afterwards, as otherwise an idle
3250                  * recalc after assoc_data is NULL but before associated
3251                  * is set can cause the interface to go idle
3252                  */
3253                 ieee80211_destroy_assoc_data(sdata, true, false);
3254
3255                 /* get uapsd queues configuration */
3256                 uapsd_queues = 0;
3257                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3258                         if (sdata->tx_conf[ac].uapsd)
3259                                 uapsd_queues |= BIT(ac);
3260         }
3261
3262         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3263 }
3264
3265 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3266                                   struct ieee80211_mgmt *mgmt, size_t len,
3267                                   struct ieee80211_rx_status *rx_status,
3268                                   struct ieee802_11_elems *elems)
3269 {
3270         struct ieee80211_local *local = sdata->local;
3271         struct ieee80211_bss *bss;
3272         struct ieee80211_channel *channel;
3273
3274         sdata_assert_lock(sdata);
3275
3276         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3277         if (!channel)
3278                 return;
3279
3280         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3281                                         channel);
3282         if (bss) {
3283                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3284                 ieee80211_rx_bss_put(local, bss);
3285         }
3286 }
3287
3288
3289 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3290                                          struct sk_buff *skb)
3291 {
3292         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3293         struct ieee80211_if_managed *ifmgd;
3294         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3295         size_t baselen, len = skb->len;
3296         struct ieee802_11_elems elems;
3297
3298         ifmgd = &sdata->u.mgd;
3299
3300         sdata_assert_lock(sdata);
3301
3302         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3303                 return; /* ignore ProbeResp to foreign address */
3304
3305         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3306         if (baselen > len)
3307                 return;
3308
3309         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3310                                false, &elems);
3311
3312         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3313
3314         if (ifmgd->associated &&
3315             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3316                 ieee80211_reset_ap_probe(sdata);
3317 }
3318
3319 /*
3320  * This is the canonical list of information elements we care about,
3321  * the filter code also gives us all changes to the Microsoft OUI
3322  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3323  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3324  * changes to requested client power.
3325  *
3326  * We implement beacon filtering in software since that means we can
3327  * avoid processing the frame here and in cfg80211, and userspace
3328  * will not be able to tell whether the hardware supports it or not.
3329  *
3330  * XXX: This list needs to be dynamic -- userspace needs to be able to
3331  *      add items it requires. It also needs to be able to tell us to
3332  *      look out for other vendor IEs.
3333  */
3334 static const u64 care_about_ies =
3335         (1ULL << WLAN_EID_COUNTRY) |
3336         (1ULL << WLAN_EID_ERP_INFO) |
3337         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3338         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3339         (1ULL << WLAN_EID_HT_CAPABILITY) |
3340         (1ULL << WLAN_EID_HT_OPERATION) |
3341         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3342
3343 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3344                                      struct ieee80211_mgmt *mgmt, size_t len,
3345                                      struct ieee80211_rx_status *rx_status)
3346 {
3347         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3348         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3349         size_t baselen;
3350         struct ieee802_11_elems elems;
3351         struct ieee80211_local *local = sdata->local;
3352         struct ieee80211_chanctx_conf *chanctx_conf;
3353         struct ieee80211_channel *chan;
3354         struct sta_info *sta;
3355         u32 changed = 0;
3356         bool erp_valid;
3357         u8 erp_value = 0;
3358         u32 ncrc;
3359         u8 *bssid;
3360         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3361
3362         sdata_assert_lock(sdata);
3363
3364         /* Process beacon from the current BSS */
3365         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3366         if (baselen > len)
3367                 return;
3368
3369         rcu_read_lock();
3370         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3371         if (!chanctx_conf) {
3372                 rcu_read_unlock();
3373                 return;
3374         }
3375
3376         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3377                 rcu_read_unlock();
3378                 return;
3379         }
3380         chan = chanctx_conf->def.chan;
3381         rcu_read_unlock();
3382
3383         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3384             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3385                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3386                                        len - baselen, false, &elems);
3387
3388                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3389                 if (elems.tim && !elems.parse_error) {
3390                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3391                         ifmgd->dtim_period = tim_ie->dtim_period;
3392                 }
3393                 ifmgd->have_beacon = true;
3394                 ifmgd->assoc_data->need_beacon = false;
3395                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3396                         sdata->vif.bss_conf.sync_tsf =
3397                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3398                         sdata->vif.bss_conf.sync_device_ts =
3399                                 rx_status->device_timestamp;
3400                         if (elems.tim)
3401                                 sdata->vif.bss_conf.sync_dtim_count =
3402                                         elems.tim->dtim_count;
3403                         else
3404                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3405                 }
3406                 /* continue assoc process */
3407                 ifmgd->assoc_data->timeout = jiffies;
3408                 ifmgd->assoc_data->timeout_started = true;
3409                 run_again(sdata, ifmgd->assoc_data->timeout);
3410                 return;
3411         }
3412
3413         if (!ifmgd->associated ||
3414             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3415                 return;
3416         bssid = ifmgd->associated->bssid;
3417
3418         /* Track average RSSI from the Beacon frames of the current AP */
3419         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3420                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3421                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3422                 ifmgd->last_cqm_event_signal = 0;
3423                 ifmgd->count_beacon_signal = 1;
3424                 ifmgd->last_ave_beacon_signal = 0;
3425         } else {
3426                 ifmgd->count_beacon_signal++;
3427         }
3428
3429         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3430
3431         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3432             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3433                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3434                 int last_sig = ifmgd->last_ave_beacon_signal;
3435                 struct ieee80211_event event = {
3436                         .type = RSSI_EVENT,
3437                 };
3438
3439                 /*
3440                  * if signal crosses either of the boundaries, invoke callback
3441                  * with appropriate parameters
3442                  */
3443                 if (sig > ifmgd->rssi_max_thold &&
3444                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3445                         ifmgd->last_ave_beacon_signal = sig;
3446                         event.u.rssi.data = RSSI_EVENT_HIGH;
3447                         drv_event_callback(local, sdata, &event);
3448                 } else if (sig < ifmgd->rssi_min_thold &&
3449                            (last_sig >= ifmgd->rssi_max_thold ||
3450                            last_sig == 0)) {
3451                         ifmgd->last_ave_beacon_signal = sig;
3452                         event.u.rssi.data = RSSI_EVENT_LOW;
3453                         drv_event_callback(local, sdata, &event);
3454                 }
3455         }
3456
3457         if (bss_conf->cqm_rssi_thold &&
3458             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3459             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3460                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3461                 int last_event = ifmgd->last_cqm_event_signal;
3462                 int thold = bss_conf->cqm_rssi_thold;
3463                 int hyst = bss_conf->cqm_rssi_hyst;
3464
3465                 if (sig < thold &&
3466                     (last_event == 0 || sig < last_event - hyst)) {
3467                         ifmgd->last_cqm_event_signal = sig;
3468                         ieee80211_cqm_rssi_notify(
3469                                 &sdata->vif,
3470                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3471                                 GFP_KERNEL);
3472                 } else if (sig > thold &&
3473                            (last_event == 0 || sig > last_event + hyst)) {
3474                         ifmgd->last_cqm_event_signal = sig;
3475                         ieee80211_cqm_rssi_notify(
3476                                 &sdata->vif,
3477                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3478                                 GFP_KERNEL);
3479                 }
3480         }
3481
3482         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3483                 mlme_dbg_ratelimited(sdata,
3484                                      "cancelling AP probe due to a received beacon\n");
3485                 ieee80211_reset_ap_probe(sdata);
3486         }
3487
3488         /*
3489          * Push the beacon loss detection into the future since
3490          * we are processing a beacon from the AP just now.
3491          */
3492         ieee80211_sta_reset_beacon_monitor(sdata);
3493
3494         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3495         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3496                                           len - baselen, false, &elems,
3497                                           care_about_ies, ncrc);
3498
3499         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3500             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3501                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3502                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3503                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3504                                 ieee80211_hw_config(local,
3505                                                     IEEE80211_CONF_CHANGE_PS);
3506                         }
3507                         ieee80211_send_nullfunc(local, sdata, false);
3508                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3509                         local->pspolling = true;
3510
3511                         /*
3512                          * Here is assumed that the driver will be
3513                          * able to send ps-poll frame and receive a
3514                          * response even though power save mode is
3515                          * enabled, but some drivers might require
3516                          * to disable power save here. This needs
3517                          * to be investigated.
3518                          */
3519                         ieee80211_send_pspoll(local, sdata);
3520                 }
3521         }
3522
3523         if (sdata->vif.p2p) {
3524                 struct ieee80211_p2p_noa_attr noa = {};
3525                 int ret;
3526
3527                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3528                                             len - baselen,
3529                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3530                                             (u8 *) &noa, sizeof(noa));
3531                 if (ret >= 2) {
3532                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3533                                 /* valid noa_attr and index changed */
3534                                 sdata->u.mgd.p2p_noa_index = noa.index;
3535                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3536                                 changed |= BSS_CHANGED_P2P_PS;
3537                                 /*
3538                                  * make sure we update all information, the CRC
3539                                  * mechanism doesn't look at P2P attributes.
3540                                  */
3541                                 ifmgd->beacon_crc_valid = false;
3542                         }
3543                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3544                         /* noa_attr not found and we had valid noa_attr before */
3545                         sdata->u.mgd.p2p_noa_index = -1;
3546                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3547                         changed |= BSS_CHANGED_P2P_PS;
3548                         ifmgd->beacon_crc_valid = false;
3549                 }
3550         }
3551
3552         if (ifmgd->csa_waiting_bcn)
3553                 ieee80211_chswitch_post_beacon(sdata);
3554
3555         /*
3556          * Update beacon timing and dtim count on every beacon appearance. This
3557          * will allow the driver to use the most updated values. Do it before
3558          * comparing this one with last received beacon.
3559          * IMPORTANT: These parameters would possibly be out of sync by the time
3560          * the driver will use them. The synchronized view is currently
3561          * guaranteed only in certain callbacks.
3562          */
3563         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3564                 sdata->vif.bss_conf.sync_tsf =
3565                         le64_to_cpu(mgmt->u.beacon.timestamp);
3566                 sdata->vif.bss_conf.sync_device_ts =
3567                         rx_status->device_timestamp;
3568                 if (elems.tim)
3569                         sdata->vif.bss_conf.sync_dtim_count =
3570                                 elems.tim->dtim_count;
3571                 else
3572                         sdata->vif.bss_conf.sync_dtim_count = 0;
3573         }
3574
3575         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3576                 return;
3577         ifmgd->beacon_crc = ncrc;
3578         ifmgd->beacon_crc_valid = true;
3579
3580         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3581
3582         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3583                                          rx_status->device_timestamp,
3584                                          &elems, true);
3585
3586         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3587             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3588                                      elems.wmm_param_len))
3589                 changed |= BSS_CHANGED_QOS;
3590
3591         /*
3592          * If we haven't had a beacon before, tell the driver about the
3593          * DTIM period (and beacon timing if desired) now.
3594          */
3595         if (!ifmgd->have_beacon) {
3596                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3597                 if (elems.tim)
3598                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3599                 else
3600                         bss_conf->dtim_period = 1;
3601
3602                 changed |= BSS_CHANGED_BEACON_INFO;
3603                 ifmgd->have_beacon = true;
3604
3605                 mutex_lock(&local->iflist_mtx);
3606                 ieee80211_recalc_ps(local);
3607                 mutex_unlock(&local->iflist_mtx);
3608
3609                 ieee80211_recalc_ps_vif(sdata);
3610         }
3611
3612         if (elems.erp_info) {
3613                 erp_valid = true;
3614                 erp_value = elems.erp_info[0];
3615         } else {
3616                 erp_valid = false;
3617         }
3618         changed |= ieee80211_handle_bss_capability(sdata,
3619                         le16_to_cpu(mgmt->u.beacon.capab_info),
3620                         erp_valid, erp_value);
3621
3622         mutex_lock(&local->sta_mtx);
3623         sta = sta_info_get(sdata, bssid);
3624
3625         if (ieee80211_config_bw(sdata, sta,
3626                                 elems.ht_cap_elem, elems.ht_operation,
3627                                 elems.vht_operation, bssid, &changed)) {
3628                 mutex_unlock(&local->sta_mtx);
3629                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3630                                        WLAN_REASON_DEAUTH_LEAVING,
3631                                        true, deauth_buf);
3632                 ieee80211_report_disconnect(sdata, deauth_buf,
3633                                             sizeof(deauth_buf), true,
3634                                             WLAN_REASON_DEAUTH_LEAVING);
3635                 return;
3636         }
3637
3638         if (sta && elems.opmode_notif)
3639                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3640                                             rx_status->band);
3641         mutex_unlock(&local->sta_mtx);
3642
3643         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3644                                                elems.country_elem,
3645                                                elems.country_elem_len,
3646                                                elems.pwr_constr_elem,
3647                                                elems.cisco_dtpc_elem);
3648
3649         ieee80211_bss_info_change_notify(sdata, changed);
3650 }
3651
3652 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3653                                   struct sk_buff *skb)
3654 {
3655         struct ieee80211_rx_status *rx_status;
3656         struct ieee80211_mgmt *mgmt;
3657         u16 fc;
3658         struct ieee802_11_elems elems;
3659         int ies_len;
3660
3661         rx_status = (struct ieee80211_rx_status *) skb->cb;
3662         mgmt = (struct ieee80211_mgmt *) skb->data;
3663         fc = le16_to_cpu(mgmt->frame_control);
3664
3665         sdata_lock(sdata);
3666
3667         switch (fc & IEEE80211_FCTL_STYPE) {
3668         case IEEE80211_STYPE_BEACON:
3669                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3670                 break;
3671         case IEEE80211_STYPE_PROBE_RESP:
3672                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3673                 break;
3674         case IEEE80211_STYPE_AUTH:
3675                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3676                 break;
3677         case IEEE80211_STYPE_DEAUTH:
3678                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3679                 break;
3680         case IEEE80211_STYPE_DISASSOC:
3681                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3682                 break;
3683         case IEEE80211_STYPE_ASSOC_RESP:
3684         case IEEE80211_STYPE_REASSOC_RESP:
3685                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3686                 break;
3687         case IEEE80211_STYPE_ACTION:
3688                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3689                         ies_len = skb->len -
3690                                   offsetof(struct ieee80211_mgmt,
3691                                            u.action.u.chan_switch.variable);
3692
3693                         if (ies_len < 0)
3694                                 break;
3695
3696                         ieee802_11_parse_elems(
3697                                 mgmt->u.action.u.chan_switch.variable,
3698                                 ies_len, true, &elems);
3699
3700                         if (elems.parse_error)
3701                                 break;
3702
3703                         ieee80211_sta_process_chanswitch(sdata,
3704                                                  rx_status->mactime,
3705                                                  rx_status->device_timestamp,
3706                                                  &elems, false);
3707                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3708                         ies_len = skb->len -
3709                                   offsetof(struct ieee80211_mgmt,
3710                                            u.action.u.ext_chan_switch.variable);
3711
3712                         if (ies_len < 0)
3713                                 break;
3714
3715                         ieee802_11_parse_elems(
3716                                 mgmt->u.action.u.ext_chan_switch.variable,
3717                                 ies_len, true, &elems);
3718
3719                         if (elems.parse_error)
3720                                 break;
3721
3722                         /* for the handling code pretend this was also an IE */
3723                         elems.ext_chansw_ie =
3724                                 &mgmt->u.action.u.ext_chan_switch.data;
3725
3726                         ieee80211_sta_process_chanswitch(sdata,
3727                                                  rx_status->mactime,
3728                                                  rx_status->device_timestamp,
3729                                                  &elems, false);
3730                 }
3731                 break;
3732         }
3733         sdata_unlock(sdata);
3734 }
3735
3736 static void ieee80211_sta_timer(unsigned long data)
3737 {
3738         struct ieee80211_sub_if_data *sdata =
3739                 (struct ieee80211_sub_if_data *) data;
3740
3741         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3742 }
3743
3744 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3745                                           u8 *bssid, u8 reason, bool tx)
3746 {
3747         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3748
3749         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3750                                tx, frame_buf);
3751
3752         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3753                                     reason);
3754 }
3755
3756 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3757 {
3758         struct ieee80211_local *local = sdata->local;
3759         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3760         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3761         u32 tx_flags = 0;
3762         u16 trans = 1;
3763         u16 status = 0;
3764
3765         sdata_assert_lock(sdata);
3766
3767         if (WARN_ON_ONCE(!auth_data))
3768                 return -EINVAL;
3769
3770         auth_data->tries++;
3771
3772         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3773                 sdata_info(sdata, "authentication with %pM timed out\n",
3774                            auth_data->bss->bssid);
3775
3776                 /*
3777                  * Most likely AP is not in the range so remove the
3778                  * bss struct for that AP.
3779                  */
3780                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3781
3782                 return -ETIMEDOUT;
3783         }
3784
3785         drv_mgd_prepare_tx(local, sdata);
3786
3787         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3788                    auth_data->bss->bssid, auth_data->tries,
3789                    IEEE80211_AUTH_MAX_TRIES);
3790
3791         auth_data->expected_transaction = 2;
3792
3793         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3794                 trans = auth_data->sae_trans;
3795                 status = auth_data->sae_status;
3796                 auth_data->expected_transaction = trans;
3797         }
3798
3799         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3800                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3801                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3802
3803         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3804                             auth_data->data, auth_data->data_len,
3805                             auth_data->bss->bssid,
3806                             auth_data->bss->bssid, NULL, 0, 0,
3807                             tx_flags);
3808
3809         if (tx_flags == 0) {
3810                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3811                 auth_data->timeout_started = true;
3812                 run_again(sdata, auth_data->timeout);
3813         } else {
3814                 auth_data->timeout =
3815                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3816                 auth_data->timeout_started = true;
3817                 run_again(sdata, auth_data->timeout);
3818         }
3819
3820         return 0;
3821 }
3822
3823 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3824 {
3825         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3826         struct ieee80211_local *local = sdata->local;
3827
3828         sdata_assert_lock(sdata);
3829
3830         assoc_data->tries++;
3831         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3832                 sdata_info(sdata, "association with %pM timed out\n",
3833                            assoc_data->bss->bssid);
3834
3835                 /*
3836                  * Most likely AP is not in the range so remove the
3837                  * bss struct for that AP.
3838                  */
3839                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3840
3841                 return -ETIMEDOUT;
3842         }
3843
3844         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3845                    assoc_data->bss->bssid, assoc_data->tries,
3846                    IEEE80211_ASSOC_MAX_TRIES);
3847         ieee80211_send_assoc(sdata);
3848
3849         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3850                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3851                 assoc_data->timeout_started = true;
3852                 run_again(sdata, assoc_data->timeout);
3853         } else {
3854                 assoc_data->timeout =
3855                         round_jiffies_up(jiffies +
3856                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3857                 assoc_data->timeout_started = true;
3858                 run_again(sdata, assoc_data->timeout);
3859         }
3860
3861         return 0;
3862 }
3863
3864 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3865                                   __le16 fc, bool acked)
3866 {
3867         struct ieee80211_local *local = sdata->local;
3868
3869         sdata->u.mgd.status_fc = fc;
3870         sdata->u.mgd.status_acked = acked;
3871         sdata->u.mgd.status_received = true;
3872
3873         ieee80211_queue_work(&local->hw, &sdata->work);
3874 }
3875
3876 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3877 {
3878         struct ieee80211_local *local = sdata->local;
3879         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3880
3881         sdata_lock(sdata);
3882
3883         if (ifmgd->status_received) {
3884                 __le16 fc = ifmgd->status_fc;
3885                 bool status_acked = ifmgd->status_acked;
3886
3887                 ifmgd->status_received = false;
3888                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3889                         if (status_acked) {
3890                                 ifmgd->auth_data->timeout =
3891                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3892                                 run_again(sdata, ifmgd->auth_data->timeout);
3893                         } else {
3894                                 ifmgd->auth_data->timeout = jiffies - 1;
3895                         }
3896                         ifmgd->auth_data->timeout_started = true;
3897                 } else if (ifmgd->assoc_data &&
3898                            (ieee80211_is_assoc_req(fc) ||
3899                             ieee80211_is_reassoc_req(fc))) {
3900                         if (status_acked) {
3901                                 ifmgd->assoc_data->timeout =
3902                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3903                                 run_again(sdata, ifmgd->assoc_data->timeout);
3904                         } else {
3905                                 ifmgd->assoc_data->timeout = jiffies - 1;
3906                         }
3907                         ifmgd->assoc_data->timeout_started = true;
3908                 }
3909         }
3910
3911         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3912             time_after(jiffies, ifmgd->auth_data->timeout)) {
3913                 if (ifmgd->auth_data->done) {
3914                         /*
3915                          * ok ... we waited for assoc but userspace didn't,
3916                          * so let's just kill the auth data
3917                          */
3918                         ieee80211_destroy_auth_data(sdata, false);
3919                 } else if (ieee80211_auth(sdata)) {
3920                         u8 bssid[ETH_ALEN];
3921                         struct ieee80211_event event = {
3922                                 .type = MLME_EVENT,
3923                                 .u.mlme.data = AUTH_EVENT,
3924                                 .u.mlme.status = MLME_TIMEOUT,
3925                         };
3926
3927                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3928
3929                         ieee80211_destroy_auth_data(sdata, false);
3930
3931                         cfg80211_auth_timeout(sdata->dev, bssid);
3932                         drv_event_callback(sdata->local, sdata, &event);
3933                 }
3934         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3935                 run_again(sdata, ifmgd->auth_data->timeout);
3936
3937         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3938             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3939                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3940                     ieee80211_do_assoc(sdata)) {
3941                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3942                         struct ieee80211_event event = {
3943                                 .type = MLME_EVENT,
3944                                 .u.mlme.data = ASSOC_EVENT,
3945                                 .u.mlme.status = MLME_TIMEOUT,
3946                         };
3947
3948                         ieee80211_destroy_assoc_data(sdata, false, false);
3949                         cfg80211_assoc_timeout(sdata->dev, bss);
3950                         drv_event_callback(sdata->local, sdata, &event);
3951                 }
3952         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3953                 run_again(sdata, ifmgd->assoc_data->timeout);
3954
3955         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3956             ifmgd->associated) {
3957                 u8 bssid[ETH_ALEN];
3958                 int max_tries;
3959
3960                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3961
3962                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3963                         max_tries = max_nullfunc_tries;
3964                 else
3965                         max_tries = max_probe_tries;
3966
3967                 /* ACK received for nullfunc probing frame */
3968                 if (!ifmgd->probe_send_count)
3969                         ieee80211_reset_ap_probe(sdata);
3970                 else if (ifmgd->nullfunc_failed) {
3971                         if (ifmgd->probe_send_count < max_tries) {
3972                                 mlme_dbg(sdata,
3973                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3974                                          bssid, ifmgd->probe_send_count,
3975                                          max_tries);
3976                                 ieee80211_mgd_probe_ap_send(sdata);
3977                         } else {
3978                                 mlme_dbg(sdata,
3979                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3980                                          bssid);
3981                                 ieee80211_sta_connection_lost(sdata, bssid,
3982                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3983                                         false);
3984                         }
3985                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3986                         run_again(sdata, ifmgd->probe_timeout);
3987                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3988                         mlme_dbg(sdata,
3989                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3990                                  bssid, probe_wait_ms);
3991                         ieee80211_sta_connection_lost(sdata, bssid,
3992                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3993                 } else if (ifmgd->probe_send_count < max_tries) {
3994                         mlme_dbg(sdata,
3995                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3996                                  bssid, probe_wait_ms,
3997                                  ifmgd->probe_send_count, max_tries);
3998                         ieee80211_mgd_probe_ap_send(sdata);
3999                 } else {
4000                         /*
4001                          * We actually lost the connection ... or did we?
4002                          * Let's make sure!
4003                          */
4004                         wiphy_debug(local->hw.wiphy,
4005                                     "%s: No probe response from AP %pM"
4006                                     " after %dms, disconnecting.\n",
4007                                     sdata->name,
4008                                     bssid, probe_wait_ms);
4009
4010                         ieee80211_sta_connection_lost(sdata, bssid,
4011                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4012                 }
4013         }
4014
4015         sdata_unlock(sdata);
4016 }
4017
4018 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
4019 {
4020         struct ieee80211_sub_if_data *sdata =
4021                 (struct ieee80211_sub_if_data *) data;
4022         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4023
4024         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4025                 return;
4026
4027         sdata->u.mgd.connection_loss = false;
4028         ieee80211_queue_work(&sdata->local->hw,
4029                              &sdata->u.mgd.beacon_connection_loss_work);
4030 }
4031
4032 static void ieee80211_sta_conn_mon_timer(unsigned long data)
4033 {
4034         struct ieee80211_sub_if_data *sdata =
4035                 (struct ieee80211_sub_if_data *) data;
4036         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4037         struct ieee80211_local *local = sdata->local;
4038
4039         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4040                 return;
4041
4042         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4043 }
4044
4045 static void ieee80211_sta_monitor_work(struct work_struct *work)
4046 {
4047         struct ieee80211_sub_if_data *sdata =
4048                 container_of(work, struct ieee80211_sub_if_data,
4049                              u.mgd.monitor_work);
4050
4051         ieee80211_mgd_probe_ap(sdata, false);
4052 }
4053
4054 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4055 {
4056         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4057                 __ieee80211_stop_poll(sdata);
4058
4059                 /* let's probe the connection once */
4060                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4061                         ieee80211_queue_work(&sdata->local->hw,
4062                                              &sdata->u.mgd.monitor_work);
4063         }
4064 }
4065
4066 #ifdef CONFIG_PM
4067 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4068 {
4069         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4070         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4071
4072         sdata_lock(sdata);
4073
4074         if (ifmgd->auth_data || ifmgd->assoc_data) {
4075                 const u8 *bssid = ifmgd->auth_data ?
4076                                 ifmgd->auth_data->bss->bssid :
4077                                 ifmgd->assoc_data->bss->bssid;
4078
4079                 /*
4080                  * If we are trying to authenticate / associate while suspending,
4081                  * cfg80211 won't know and won't actually abort those attempts,
4082                  * thus we need to do that ourselves.
4083                  */
4084                 ieee80211_send_deauth_disassoc(sdata, bssid,
4085                                                IEEE80211_STYPE_DEAUTH,
4086                                                WLAN_REASON_DEAUTH_LEAVING,
4087                                                false, frame_buf);
4088                 if (ifmgd->assoc_data)
4089                         ieee80211_destroy_assoc_data(sdata, false, true);
4090                 if (ifmgd->auth_data)
4091                         ieee80211_destroy_auth_data(sdata, false);
4092                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4093                                       IEEE80211_DEAUTH_FRAME_LEN);
4094         }
4095
4096         /* This is a bit of a hack - we should find a better and more generic
4097          * solution to this. Normally when suspending, cfg80211 will in fact
4098          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4099          * auth (not so important) or assoc (this is the problem) process.
4100          *
4101          * As a consequence, it can happen that we are in the process of both
4102          * associating and suspending, and receive an association response
4103          * after cfg80211 has checked if it needs to disconnect, but before
4104          * we actually set the flag to drop incoming frames. This will then
4105          * cause the workqueue flush to process the association response in
4106          * the suspend, resulting in a successful association just before it
4107          * tries to remove the interface from the driver, which now though
4108          * has a channel context assigned ... this results in issues.
4109          *
4110          * To work around this (for now) simply deauth here again if we're
4111          * now connected.
4112          */
4113         if (ifmgd->associated && !sdata->local->wowlan) {
4114                 u8 bssid[ETH_ALEN];
4115                 struct cfg80211_deauth_request req = {
4116                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4117                         .bssid = bssid,
4118                 };
4119
4120                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4121                 ieee80211_mgd_deauth(sdata, &req);
4122         }
4123
4124         sdata_unlock(sdata);
4125 }
4126
4127 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4128 {
4129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4130
4131         sdata_lock(sdata);
4132         if (!ifmgd->associated) {
4133                 sdata_unlock(sdata);
4134                 return;
4135         }
4136
4137         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4138                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4139                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4140                 ieee80211_sta_connection_lost(sdata,
4141                                               ifmgd->associated->bssid,
4142                                               WLAN_REASON_UNSPECIFIED,
4143                                               true);
4144                 sdata_unlock(sdata);
4145                 return;
4146         }
4147         sdata_unlock(sdata);
4148 }
4149 #endif
4150
4151 /* interface setup */
4152 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4153 {
4154         struct ieee80211_if_managed *ifmgd;
4155
4156         ifmgd = &sdata->u.mgd;
4157         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4158         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4159         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4160                   ieee80211_beacon_connection_loss_work);
4161         INIT_WORK(&ifmgd->csa_connection_drop_work,
4162                   ieee80211_csa_connection_drop_work);
4163         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4164         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4165                           ieee80211_tdls_peer_del_work);
4166         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4167                     (unsigned long) sdata);
4168         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4169                     (unsigned long) sdata);
4170         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4171                     (unsigned long) sdata);
4172         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4173                     (unsigned long) sdata);
4174         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4175                           ieee80211_sta_handle_tspec_ac_params_wk);
4176
4177         ifmgd->flags = 0;
4178         ifmgd->powersave = sdata->wdev.ps;
4179         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4180         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4181         ifmgd->p2p_noa_index = -1;
4182
4183         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4184                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4185         else
4186                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4187
4188         /* Setup TDLS data */
4189         spin_lock_init(&ifmgd->teardown_lock);
4190         ifmgd->teardown_skb = NULL;
4191         ifmgd->orig_teardown_skb = NULL;
4192 }
4193
4194 /* scan finished notification */
4195 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4196 {
4197         struct ieee80211_sub_if_data *sdata;
4198
4199         /* Restart STA timers */
4200         rcu_read_lock();
4201         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4202                 if (ieee80211_sdata_running(sdata))
4203                         ieee80211_restart_sta_timer(sdata);
4204         }
4205         rcu_read_unlock();
4206 }
4207
4208 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4209                                      struct cfg80211_bss *cbss)
4210 {
4211         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4212         const u8 *ht_cap_ie, *vht_cap_ie;
4213         const struct ieee80211_ht_cap *ht_cap;
4214         const struct ieee80211_vht_cap *vht_cap;
4215         u8 chains = 1;
4216
4217         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4218                 return chains;
4219
4220         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4221         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4222                 ht_cap = (void *)(ht_cap_ie + 2);
4223                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4224                 /*
4225                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4226                  *       "Tx Unequal Modulation Supported" fields.
4227                  */
4228         }
4229
4230         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4231                 return chains;
4232
4233         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4234         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4235                 u8 nss;
4236                 u16 tx_mcs_map;
4237
4238                 vht_cap = (void *)(vht_cap_ie + 2);
4239                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4240                 for (nss = 8; nss > 0; nss--) {
4241                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4242                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4243                                 break;
4244                 }
4245                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4246                 chains = max(chains, nss);
4247         }
4248
4249         return chains;
4250 }
4251
4252 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4253                                   struct cfg80211_bss *cbss)
4254 {
4255         struct ieee80211_local *local = sdata->local;
4256         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4257         const struct ieee80211_ht_cap *ht_cap = NULL;
4258         const struct ieee80211_ht_operation *ht_oper = NULL;
4259         const struct ieee80211_vht_operation *vht_oper = NULL;
4260         struct ieee80211_supported_band *sband;
4261         struct cfg80211_chan_def chandef;
4262         int ret;
4263         u32 i;
4264         bool have_80mhz;
4265
4266         sband = local->hw.wiphy->bands[cbss->channel->band];
4267
4268         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4269                           IEEE80211_STA_DISABLE_80P80MHZ |
4270                           IEEE80211_STA_DISABLE_160MHZ);
4271
4272         rcu_read_lock();
4273
4274         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4275             sband->ht_cap.ht_supported) {
4276                 const u8 *ht_oper_ie, *ht_cap_ie;
4277
4278                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4279                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4280                         ht_oper = (void *)(ht_oper_ie + 2);
4281
4282                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4283                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4284                         ht_cap = (void *)(ht_cap_ie + 2);
4285
4286                 if (!ht_cap) {
4287                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4288                         ht_oper = NULL;
4289                 }
4290         }
4291
4292         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4293             sband->vht_cap.vht_supported) {
4294                 const u8 *vht_oper_ie, *vht_cap;
4295
4296                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4297                                                    WLAN_EID_VHT_OPERATION);
4298                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4299                         vht_oper = (void *)(vht_oper_ie + 2);
4300                 if (vht_oper && !ht_oper) {
4301                         vht_oper = NULL;
4302                         sdata_info(sdata,
4303                                    "AP advertised VHT without HT, disabling both\n");
4304                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4305                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4306                 }
4307
4308                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4309                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4310                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4311                         vht_oper = NULL;
4312                 }
4313         }
4314
4315         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4316         have_80mhz = false;
4317         for (i = 0; i < sband->n_channels; i++) {
4318                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4319                                                 IEEE80211_CHAN_NO_80MHZ))
4320                         continue;
4321
4322                 have_80mhz = true;
4323                 break;
4324         }
4325
4326         if (!have_80mhz)
4327                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4328
4329         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4330                                                      cbss->channel,
4331                                                      ht_cap, ht_oper, vht_oper,
4332                                                      &chandef, false);
4333
4334         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4335                                       local->rx_chains);
4336
4337         rcu_read_unlock();
4338
4339         /* will change later if needed */
4340         sdata->smps_mode = IEEE80211_SMPS_OFF;
4341
4342         mutex_lock(&local->mtx);
4343         /*
4344          * If this fails (possibly due to channel context sharing
4345          * on incompatible channels, e.g. 80+80 and 160 sharing the
4346          * same control channel) try to use a smaller bandwidth.
4347          */
4348         ret = ieee80211_vif_use_channel(sdata, &chandef,
4349                                         IEEE80211_CHANCTX_SHARED);
4350
4351         /* don't downgrade for 5 and 10 MHz channels, though. */
4352         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4353             chandef.width == NL80211_CHAN_WIDTH_10)
4354                 goto out;
4355
4356         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4357                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4358                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4359                                                 IEEE80211_CHANCTX_SHARED);
4360         }
4361  out:
4362         mutex_unlock(&local->mtx);
4363         return ret;
4364 }
4365
4366 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4367                                      struct cfg80211_bss *cbss, bool assoc,
4368                                      bool override)
4369 {
4370         struct ieee80211_local *local = sdata->local;
4371         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4372         struct ieee80211_bss *bss = (void *)cbss->priv;
4373         struct sta_info *new_sta = NULL;
4374         struct ieee80211_supported_band *sband;
4375         bool have_sta = false;
4376         int err;
4377
4378         sband = local->hw.wiphy->bands[cbss->channel->band];
4379
4380         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4381                 return -EINVAL;
4382
4383         /* If a reconfig is happening, bail out */
4384         if (local->in_reconfig)
4385                 return -EBUSY;
4386
4387         if (assoc) {
4388                 rcu_read_lock();
4389                 have_sta = sta_info_get(sdata, cbss->bssid);
4390                 rcu_read_unlock();
4391         }
4392
4393         if (!have_sta) {
4394                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4395                 if (!new_sta)
4396                         return -ENOMEM;
4397         }
4398
4399         if (new_sta || override) {
4400                 err = ieee80211_prep_channel(sdata, cbss);
4401                 if (err) {
4402                         if (new_sta)
4403                                 sta_info_free(local, new_sta);
4404                         return -EINVAL;
4405                 }
4406         }
4407
4408         if (new_sta) {
4409                 u32 rates = 0, basic_rates = 0;
4410                 bool have_higher_than_11mbit;
4411                 int min_rate = INT_MAX, min_rate_index = -1;
4412                 struct ieee80211_chanctx_conf *chanctx_conf;
4413                 const struct cfg80211_bss_ies *ies;
4414                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4415                 u32 rate_flags;
4416
4417                 rcu_read_lock();
4418                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4419                 if (WARN_ON(!chanctx_conf)) {
4420                         rcu_read_unlock();
4421                         sta_info_free(local, new_sta);
4422                         return -EINVAL;
4423                 }
4424                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4425                 rcu_read_unlock();
4426
4427                 ieee80211_get_rates(sband, bss->supp_rates,
4428                                     bss->supp_rates_len,
4429                                     &rates, &basic_rates,
4430                                     &have_higher_than_11mbit,
4431                                     &min_rate, &min_rate_index,
4432                                     shift, rate_flags);
4433
4434                 /*
4435                  * This used to be a workaround for basic rates missing
4436                  * in the association response frame. Now that we no
4437                  * longer use the basic rates from there, it probably
4438                  * doesn't happen any more, but keep the workaround so
4439                  * in case some *other* APs are buggy in different ways
4440                  * we can connect -- with a warning.
4441                  */
4442                 if (!basic_rates && min_rate_index >= 0) {
4443                         sdata_info(sdata,
4444                                    "No basic rates, using min rate instead\n");
4445                         basic_rates = BIT(min_rate_index);
4446                 }
4447
4448                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4449                 sdata->vif.bss_conf.basic_rates = basic_rates;
4450
4451                 /* cf. IEEE 802.11 9.2.12 */
4452                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4453                     have_higher_than_11mbit)
4454                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4455                 else
4456                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4457
4458                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4459
4460                 /* set timing information */
4461                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4462                 rcu_read_lock();
4463                 ies = rcu_dereference(cbss->beacon_ies);
4464                 if (ies) {
4465                         const u8 *tim_ie;
4466
4467                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4468                         sdata->vif.bss_conf.sync_device_ts =
4469                                 bss->device_ts_beacon;
4470                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4471                                                   ies->data, ies->len);
4472                         if (tim_ie && tim_ie[1] >= 2)
4473                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4474                         else
4475                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4476                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4477                                                TIMING_BEACON_ONLY)) {
4478                         ies = rcu_dereference(cbss->proberesp_ies);
4479                         /* must be non-NULL since beacon IEs were NULL */
4480                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4481                         sdata->vif.bss_conf.sync_device_ts =
4482                                 bss->device_ts_presp;
4483                         sdata->vif.bss_conf.sync_dtim_count = 0;
4484                 } else {
4485                         sdata->vif.bss_conf.sync_tsf = 0;
4486                         sdata->vif.bss_conf.sync_device_ts = 0;
4487                         sdata->vif.bss_conf.sync_dtim_count = 0;
4488                 }
4489                 rcu_read_unlock();
4490
4491                 /* tell driver about BSSID, basic rates and timing */
4492                 ieee80211_bss_info_change_notify(sdata,
4493                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4494                         BSS_CHANGED_BEACON_INT);
4495
4496                 if (assoc)
4497                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4498
4499                 err = sta_info_insert(new_sta);
4500                 new_sta = NULL;
4501                 if (err) {
4502                         sdata_info(sdata,
4503                                    "failed to insert STA entry for the AP (error %d)\n",
4504                                    err);
4505                         return err;
4506                 }
4507         } else
4508                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4509
4510         /* Cancel scan to ensure that nothing interferes with connection */
4511         if (local->scanning)
4512                 ieee80211_scan_cancel(local);
4513
4514         return 0;
4515 }
4516
4517 /* config hooks */
4518 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4519                        struct cfg80211_auth_request *req)
4520 {
4521         struct ieee80211_local *local = sdata->local;
4522         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4523         struct ieee80211_mgd_auth_data *auth_data;
4524         u16 auth_alg;
4525         int err;
4526
4527         /* prepare auth data structure */
4528
4529         switch (req->auth_type) {
4530         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4531                 auth_alg = WLAN_AUTH_OPEN;
4532                 break;
4533         case NL80211_AUTHTYPE_SHARED_KEY:
4534                 if (IS_ERR(local->wep_tx_tfm))
4535                         return -EOPNOTSUPP;
4536                 auth_alg = WLAN_AUTH_SHARED_KEY;
4537                 break;
4538         case NL80211_AUTHTYPE_FT:
4539                 auth_alg = WLAN_AUTH_FT;
4540                 break;
4541         case NL80211_AUTHTYPE_NETWORK_EAP:
4542                 auth_alg = WLAN_AUTH_LEAP;
4543                 break;
4544         case NL80211_AUTHTYPE_SAE:
4545                 auth_alg = WLAN_AUTH_SAE;
4546                 break;
4547         default:
4548                 return -EOPNOTSUPP;
4549         }
4550
4551         auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4552                             req->ie_len, GFP_KERNEL);
4553         if (!auth_data)
4554                 return -ENOMEM;
4555
4556         auth_data->bss = req->bss;
4557
4558         if (req->auth_data_len >= 4) {
4559                 __le16 *pos = (__le16 *) req->auth_data;
4560                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4561                 auth_data->sae_status = le16_to_cpu(pos[1]);
4562                 memcpy(auth_data->data, req->auth_data + 4,
4563                        req->auth_data_len - 4);
4564                 auth_data->data_len += req->auth_data_len - 4;
4565         }
4566
4567         if (req->ie && req->ie_len) {
4568                 memcpy(&auth_data->data[auth_data->data_len],
4569                        req->ie, req->ie_len);
4570                 auth_data->data_len += req->ie_len;
4571         }
4572
4573         if (req->key && req->key_len) {
4574                 auth_data->key_len = req->key_len;
4575                 auth_data->key_idx = req->key_idx;
4576                 memcpy(auth_data->key, req->key, req->key_len);
4577         }
4578
4579         auth_data->algorithm = auth_alg;
4580
4581         /* try to authenticate/probe */
4582
4583         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4584             ifmgd->assoc_data) {
4585                 err = -EBUSY;
4586                 goto err_free;
4587         }
4588
4589         if (ifmgd->auth_data)
4590                 ieee80211_destroy_auth_data(sdata, false);
4591
4592         /* prep auth_data so we don't go into idle on disassoc */
4593         ifmgd->auth_data = auth_data;
4594
4595         if (ifmgd->associated) {
4596                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4597
4598                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4599                                        WLAN_REASON_UNSPECIFIED,
4600                                        false, frame_buf);
4601
4602                 ieee80211_report_disconnect(sdata, frame_buf,
4603                                             sizeof(frame_buf), true,
4604                                             WLAN_REASON_UNSPECIFIED);
4605         }
4606
4607         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4608
4609         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4610         if (err)
4611                 goto err_clear;
4612
4613         err = ieee80211_auth(sdata);
4614         if (err) {
4615                 sta_info_destroy_addr(sdata, req->bss->bssid);
4616                 goto err_clear;
4617         }
4618
4619         /* hold our own reference */
4620         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4621         return 0;
4622
4623  err_clear:
4624         eth_zero_addr(ifmgd->bssid);
4625         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4626         ifmgd->auth_data = NULL;
4627         mutex_lock(&sdata->local->mtx);
4628         ieee80211_vif_release_channel(sdata);
4629         mutex_unlock(&sdata->local->mtx);
4630  err_free:
4631         kfree(auth_data);
4632         return err;
4633 }
4634
4635 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4636                         struct cfg80211_assoc_request *req)
4637 {
4638         struct ieee80211_local *local = sdata->local;
4639         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4640         struct ieee80211_bss *bss = (void *)req->bss->priv;
4641         struct ieee80211_mgd_assoc_data *assoc_data;
4642         const struct cfg80211_bss_ies *beacon_ies;
4643         struct ieee80211_supported_band *sband;
4644         const u8 *ssidie, *ht_ie, *vht_ie;
4645         int i, err;
4646         bool override = false;
4647
4648         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4649         if (!assoc_data)
4650                 return -ENOMEM;
4651
4652         rcu_read_lock();
4653         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4654         if (!ssidie) {
4655                 rcu_read_unlock();
4656                 kfree(assoc_data);
4657                 return -EINVAL;
4658         }
4659         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4660         assoc_data->ssid_len = ssidie[1];
4661         rcu_read_unlock();
4662
4663         if (ifmgd->associated) {
4664                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4665
4666                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4667                                        WLAN_REASON_UNSPECIFIED,
4668                                        false, frame_buf);
4669
4670                 ieee80211_report_disconnect(sdata, frame_buf,
4671                                             sizeof(frame_buf), true,
4672                                             WLAN_REASON_UNSPECIFIED);
4673         }
4674
4675         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4676                 err = -EBUSY;
4677                 goto err_free;
4678         }
4679
4680         if (ifmgd->assoc_data) {
4681                 err = -EBUSY;
4682                 goto err_free;
4683         }
4684
4685         if (ifmgd->auth_data) {
4686                 bool match;
4687
4688                 /* keep sta info, bssid if matching */
4689                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4690                 ieee80211_destroy_auth_data(sdata, match);
4691         }
4692
4693         /* prepare assoc data */
4694
4695         ifmgd->beacon_crc_valid = false;
4696
4697         assoc_data->wmm = bss->wmm_used &&
4698                           (local->hw.queues >= IEEE80211_NUM_ACS);
4699
4700         /*
4701          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4702          * We still associate in non-HT mode (11a/b/g) if any one of these
4703          * ciphers is configured as pairwise.
4704          * We can set this to true for non-11n hardware, that'll be checked
4705          * separately along with the peer capabilities.
4706          */
4707         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4708                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4709                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4710                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4711                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4712                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4713                         netdev_info(sdata->dev,
4714                                     "disabling HT/VHT due to WEP/TKIP use\n");
4715                 }
4716         }
4717
4718         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4719         sband = local->hw.wiphy->bands[req->bss->channel->band];
4720         if (!sband->ht_cap.ht_supported ||
4721             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4722             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4723                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4724                 if (!bss->wmm_used &&
4725                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4726                         netdev_info(sdata->dev,
4727                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4728         }
4729
4730         /* disable VHT if we don't support it or the AP doesn't use WMM */
4731         if (!sband->vht_cap.vht_supported ||
4732             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4733             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4734                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4735                 if (!bss->wmm_used &&
4736                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4737                         netdev_info(sdata->dev,
4738                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4739         }
4740
4741         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4742         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4743                sizeof(ifmgd->ht_capa_mask));
4744
4745         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4746         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4747                sizeof(ifmgd->vht_capa_mask));
4748
4749         if (req->ie && req->ie_len) {
4750                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4751                 assoc_data->ie_len = req->ie_len;
4752         }
4753
4754         assoc_data->bss = req->bss;
4755
4756         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4757                 if (ifmgd->powersave)
4758                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4759                 else
4760                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4761         } else
4762                 sdata->smps_mode = ifmgd->req_smps;
4763
4764         assoc_data->capability = req->bss->capability;
4765         assoc_data->supp_rates = bss->supp_rates;
4766         assoc_data->supp_rates_len = bss->supp_rates_len;
4767
4768         rcu_read_lock();
4769         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4770         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4771                 assoc_data->ap_ht_param =
4772                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4773         else
4774                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4775         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4776         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4777                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4778                        sizeof(struct ieee80211_vht_cap));
4779         else
4780                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4781         rcu_read_unlock();
4782
4783         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4784                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4785              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4786                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4787
4788         if (bss->wmm_used && bss->uapsd_supported &&
4789             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4790                 assoc_data->uapsd = true;
4791                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4792         } else {
4793                 assoc_data->uapsd = false;
4794                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4795         }
4796
4797         if (req->prev_bssid)
4798                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4799
4800         if (req->use_mfp) {
4801                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4802                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4803         } else {
4804                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4805                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4806         }
4807
4808         if (req->flags & ASSOC_REQ_USE_RRM)
4809                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4810         else
4811                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4812
4813         if (req->crypto.control_port)
4814                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4815         else
4816                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4817
4818         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4819         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4820         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4821                                                         sdata->vif.type);
4822
4823         /* kick off associate process */
4824
4825         ifmgd->assoc_data = assoc_data;
4826         ifmgd->dtim_period = 0;
4827         ifmgd->have_beacon = false;
4828
4829         /* override HT/VHT configuration only if the AP and we support it */
4830         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4831                 struct ieee80211_sta_ht_cap sta_ht_cap;
4832
4833                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4834                         override = true;
4835
4836                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4837                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4838
4839                 /* check for 40 MHz disable override */
4840                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4841                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4842                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4843                         override = true;
4844
4845                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4846                     req->flags & ASSOC_REQ_DISABLE_VHT)
4847                         override = true;
4848         }
4849
4850         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4851                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4852                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4853         }
4854
4855         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4856                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4857
4858         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4859         if (err)
4860                 goto err_clear;
4861
4862         rcu_read_lock();
4863         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4864
4865         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4866             !beacon_ies) {
4867                 /*
4868                  * Wait up to one beacon interval ...
4869                  * should this be more if we miss one?
4870                  */
4871                 sdata_info(sdata, "waiting for beacon from %pM\n",
4872                            ifmgd->bssid);
4873                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4874                 assoc_data->timeout_started = true;
4875                 assoc_data->need_beacon = true;
4876         } else if (beacon_ies) {
4877                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4878                                                     beacon_ies->data,
4879                                                     beacon_ies->len);
4880                 u8 dtim_count = 0;
4881
4882                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4883                         const struct ieee80211_tim_ie *tim;
4884                         tim = (void *)(tim_ie + 2);
4885                         ifmgd->dtim_period = tim->dtim_period;
4886                         dtim_count = tim->dtim_count;
4887                 }
4888                 ifmgd->have_beacon = true;
4889                 assoc_data->timeout = jiffies;
4890                 assoc_data->timeout_started = true;
4891
4892                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4893                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4894                         sdata->vif.bss_conf.sync_device_ts =
4895                                 bss->device_ts_beacon;
4896                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4897                 }
4898         } else {
4899                 assoc_data->timeout = jiffies;
4900                 assoc_data->timeout_started = true;
4901         }
4902         rcu_read_unlock();
4903
4904         run_again(sdata, assoc_data->timeout);
4905
4906         if (bss->corrupt_data) {
4907                 char *corrupt_type = "data";
4908                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4909                         if (bss->corrupt_data &
4910                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4911                                 corrupt_type = "beacon and probe response";
4912                         else
4913                                 corrupt_type = "beacon";
4914                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4915                         corrupt_type = "probe response";
4916                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4917                            corrupt_type);
4918         }
4919
4920         return 0;
4921  err_clear:
4922         eth_zero_addr(ifmgd->bssid);
4923         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4924         ifmgd->assoc_data = NULL;
4925  err_free:
4926         kfree(assoc_data);
4927         return err;
4928 }
4929
4930 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4931                          struct cfg80211_deauth_request *req)
4932 {
4933         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4934         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4935         bool tx = !req->local_state_change;
4936
4937         if (ifmgd->auth_data &&
4938             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4939                 sdata_info(sdata,
4940                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4941                            req->bssid, req->reason_code,
4942                            ieee80211_get_reason_code_string(req->reason_code));
4943
4944                 drv_mgd_prepare_tx(sdata->local, sdata);
4945                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4946                                                IEEE80211_STYPE_DEAUTH,
4947                                                req->reason_code, tx,
4948                                                frame_buf);
4949                 ieee80211_destroy_auth_data(sdata, false);
4950                 ieee80211_report_disconnect(sdata, frame_buf,
4951                                             sizeof(frame_buf), true,
4952                                             req->reason_code);
4953
4954                 return 0;
4955         }
4956
4957         if (ifmgd->assoc_data &&
4958             ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4959                 sdata_info(sdata,
4960                            "aborting association with %pM by local choice (Reason: %u=%s)\n",
4961                            req->bssid, req->reason_code,
4962                            ieee80211_get_reason_code_string(req->reason_code));
4963
4964                 drv_mgd_prepare_tx(sdata->local, sdata);
4965                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4966                                                IEEE80211_STYPE_DEAUTH,
4967                                                req->reason_code, tx,
4968                                                frame_buf);
4969                 ieee80211_destroy_assoc_data(sdata, false, true);
4970                 ieee80211_report_disconnect(sdata, frame_buf,
4971                                             sizeof(frame_buf), true,
4972                                             req->reason_code);
4973                 return 0;
4974         }
4975
4976         if (ifmgd->associated &&
4977             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4978                 sdata_info(sdata,
4979                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4980                            req->bssid, req->reason_code,
4981                            ieee80211_get_reason_code_string(req->reason_code));
4982
4983                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4984                                        req->reason_code, tx, frame_buf);
4985                 ieee80211_report_disconnect(sdata, frame_buf,
4986                                             sizeof(frame_buf), true,
4987                                             req->reason_code);
4988                 return 0;
4989         }
4990
4991         return -ENOTCONN;
4992 }
4993
4994 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4995                            struct cfg80211_disassoc_request *req)
4996 {
4997         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4998         u8 bssid[ETH_ALEN];
4999         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5000
5001         /*
5002          * cfg80211 should catch this ... but it's racy since
5003          * we can receive a disassoc frame, process it, hand it
5004          * to cfg80211 while that's in a locked section already
5005          * trying to tell us that the user wants to disconnect.
5006          */
5007         if (ifmgd->associated != req->bss)
5008                 return -ENOLINK;
5009
5010         sdata_info(sdata,
5011                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
5012                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5013
5014         memcpy(bssid, req->bss->bssid, ETH_ALEN);
5015         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5016                                req->reason_code, !req->local_state_change,
5017                                frame_buf);
5018
5019         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5020                                     req->reason_code);
5021
5022         return 0;
5023 }
5024
5025 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5026 {
5027         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5028
5029         /*
5030          * Make sure some work items will not run after this,
5031          * they will not do anything but might not have been
5032          * cancelled when disconnecting.
5033          */
5034         cancel_work_sync(&ifmgd->monitor_work);
5035         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5036         cancel_work_sync(&ifmgd->request_smps_work);
5037         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5038         cancel_work_sync(&ifmgd->chswitch_work);
5039         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5040
5041         sdata_lock(sdata);
5042         if (ifmgd->assoc_data) {
5043                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5044                 ieee80211_destroy_assoc_data(sdata, false, false);
5045                 cfg80211_assoc_timeout(sdata->dev, bss);
5046         }
5047         if (ifmgd->auth_data)
5048                 ieee80211_destroy_auth_data(sdata, false);
5049         spin_lock_bh(&ifmgd->teardown_lock);
5050         if (ifmgd->teardown_skb) {
5051                 kfree_skb(ifmgd->teardown_skb);
5052                 ifmgd->teardown_skb = NULL;
5053                 ifmgd->orig_teardown_skb = NULL;
5054         }
5055         spin_unlock_bh(&ifmgd->teardown_lock);
5056         del_timer_sync(&ifmgd->timer);
5057         sdata_unlock(sdata);
5058 }
5059
5060 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5061                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5062                                gfp_t gfp)
5063 {
5064         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5065
5066         trace_api_cqm_rssi_notify(sdata, rssi_event);
5067
5068         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5069 }
5070 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5071
5072 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5073 {
5074         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5075
5076         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5077
5078         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5079 }
5080 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);