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  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  34 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  35 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  36 #define IEEE80211_AUTH_MAX_TRIES        3
  37 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  38 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  39 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  40 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  41 #define IEEE80211_ASSOC_MAX_TRIES       3
  42
  43 static int max_nullfunc_tries = 2;
  44 module_param(max_nullfunc_tries, int, 0644);
  45 MODULE_PARM_DESC(max_nullfunc_tries,
  46                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  47
  48 static int max_probe_tries = 5;
  49 module_param(max_probe_tries, int, 0644);
  50 MODULE_PARM_DESC(max_probe_tries,
  51                  "Maximum probe tries before disconnecting (reason 4).");
  52
  53 /*
  54  * Beacon loss timeout is calculated as N frames times the
  55  * advertised beacon interval.  This may need to be somewhat
  56  * higher than what hardware might detect to account for
  57  * delays in the host processing frames. But since we also
  58  * probe on beacon miss before declaring the connection lost
  59  * default to what we want.
  60  */
  61 static int beacon_loss_count = 7;
  62 module_param(beacon_loss_count, int, 0644);
  63 MODULE_PARM_DESC(beacon_loss_count,
  64                  "Number of beacon intervals before we decide beacon was lost.");
  65
  66 /*
  67  * Time the connection can be idle before we probe
  68  * it to see if we can still talk to the AP.
  69  */
  70 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  71 /*
  72  * Time we wait for a probe response after sending
  73  * a probe request because of beacon loss or for
  74  * checking the connection still works.
  75  */
  76 static int probe_wait_ms = 500;
  77 module_param(probe_wait_ms, int, 0644);
  78 MODULE_PARM_DESC(probe_wait_ms,
  79                  "Maximum time(ms) to wait for probe response"
  80                  " before disconnecting (reason 4).");
  81
  82 /*
  83  * Weight given to the latest Beacon frame when calculating average signal
  84  * strength for Beacon frames received in the current BSS. This must be
  85  * between 1 and 15.
  86  */
  87 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  88
  89 /*
  90  * How many Beacon frames need to have been used in average signal strength
  91  * before starting to indicate signal change events.
  92  */
  93 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  94
  95 /*
  96  * We can have multiple work items (and connection probing)
  97  * scheduling this timer, but we need to take care to only
  98  * reschedule it when it should fire _earlier_ than it was
  99  * asked for before, or if it's not pending right now. This
 100  * function ensures that. Note that it then is required to
 101  * run this function for all timeouts after the first one
 102  * has happened -- the work that runs from this timer will
 103  * do that.
 104  */
 105 static void run_again(struct ieee80211_sub_if_data *sdata,
 106                       unsigned long timeout)
 107 {
 108         sdata_assert_lock(sdata);
 109
 110         if (!timer_pending(&sdata->u.mgd.timer) ||
 111             time_before(timeout, sdata->u.mgd.timer.expires))
 112                 mod_timer(&sdata->u.mgd.timer, timeout);
 113 }
 114
 115 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 116 {
 117         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 118                 return;
 119
 120         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 121                 return;
 122
 123         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 124                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 125 }
 126
 127 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 128 {
 129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 130
 131         if (unlikely(!sdata->u.mgd.associated))
 132                 return;
 133
 134         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 135                 return;
 136
 137         mod_timer(&sdata->u.mgd.conn_mon_timer,
 138                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 139
 140         ifmgd->probe_send_count = 0;
 141 }
 142
 143 static int ecw2cw(int ecw)
 144 {
 145         return (1 << ecw) - 1;
 146 }
 147
 148 static u32
 149 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 150                              struct ieee80211_supported_band *sband,
 151                              struct ieee80211_channel *channel,
 152                              const struct ieee80211_ht_operation *ht_oper,
 153                              const struct ieee80211_vht_operation *vht_oper,
 154                              struct cfg80211_chan_def *chandef, bool tracking)
 155 {
 156         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 157         struct cfg80211_chan_def vht_chandef;
 158         u32 ht_cfreq, ret;
 159
 160         chandef->chan = channel;
 161         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 162         chandef->center_freq1 = channel->center_freq;
 163         chandef->center_freq2 = 0;
 164
 165         if (!ht_oper || !sband->ht_cap.ht_supported) {
 166                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 167                 goto out;
 168         }
 169
 170         chandef->width = NL80211_CHAN_WIDTH_20;
 171
 172         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 173                                                   channel->band);
 174         /* check that channel matches the right operating channel */
 175         if (!tracking && channel->center_freq != ht_cfreq) {
 176                 /*
 177                  * It's possible that some APs are confused here;
 178                  * Netgear WNDR3700 sometimes reports 4 higher than
 179                  * the actual channel in association responses, but
 180                  * since we look at probe response/beacon data here
 181                  * it should be OK.
 182                  */
 183                 sdata_info(sdata,
 184                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 185                            channel->center_freq, ht_cfreq,
 186                            ht_oper->primary_chan, channel->band);
 187                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 188                 goto out;
 189         }
 190
 191         /* check 40 MHz support, if we have it */
 192         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 193                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 194                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 195                         chandef->width = NL80211_CHAN_WIDTH_40;
 196                         chandef->center_freq1 += 10;
 197                         break;
 198                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 199                         chandef->width = NL80211_CHAN_WIDTH_40;
 200                         chandef->center_freq1 -= 10;
 201                         break;
 202                 }
 203         } else {
 204                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 205                 ret = IEEE80211_STA_DISABLE_VHT;
 206                 /* also mark 40 MHz disabled */
 207                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 208                 goto out;
 209         }
 210
 211         if (!vht_oper || !sband->vht_cap.vht_supported) {
 212                 ret = IEEE80211_STA_DISABLE_VHT;
 213                 goto out;
 214         }
 215
 216         vht_chandef.chan = channel;
 217         vht_chandef.center_freq1 =
 218                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 219                                                channel->band);
 220         vht_chandef.center_freq2 = 0;
 221
 222         switch (vht_oper->chan_width) {
 223         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 224                 vht_chandef.width = chandef->width;
 225                 break;
 226         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 227                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 228                 break;
 229         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 230                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 231                 break;
 232         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 233                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 234                 vht_chandef.center_freq2 =
 235                         ieee80211_channel_to_frequency(
 236                                 vht_oper->center_freq_seg2_idx,
 237                                 channel->band);
 238                 break;
 239         default:
 240                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 241                         sdata_info(sdata,
 242                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 243                                    vht_oper->chan_width);
 244                 ret = IEEE80211_STA_DISABLE_VHT;
 245                 goto out;
 246         }
 247
 248         if (!cfg80211_chandef_valid(&vht_chandef)) {
 249                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 250                         sdata_info(sdata,
 251                                    "AP VHT information is invalid, disable VHT\n");
 252                 ret = IEEE80211_STA_DISABLE_VHT;
 253                 goto out;
 254         }
 255
 256         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 257                 ret = 0;
 258                 goto out;
 259         }
 260
 261         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 262                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 263                         sdata_info(sdata,
 264                                    "AP VHT information doesn't match HT, disable VHT\n");
 265                 ret = IEEE80211_STA_DISABLE_VHT;
 266                 goto out;
 267         }
 268
 269         *chandef = vht_chandef;
 270
 271         ret = 0;
 272
 273 out:
 274         /* don't print the message below for VHT mismatch if VHT is disabled */
 275         if (ret & IEEE80211_STA_DISABLE_VHT)
 276                 vht_chandef = *chandef;
 277
 278         /*
 279          * Ignore the DISABLED flag when we're already connected and only
 280          * tracking the APs beacon for bandwidth changes - otherwise we
 281          * might get disconnected here if we connect to an AP, update our
 282          * regulatory information based on the AP's country IE and the
 283          * information we have is wrong/outdated and disables the channel
 284          * that we're actually using for the connection to the AP.
 285          */
 286         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 287                                         tracking ? 0 :
 288                                                    IEEE80211_CHAN_DISABLED)) {
 289                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 290                         ret = IEEE80211_STA_DISABLE_HT |
 291                               IEEE80211_STA_DISABLE_VHT;
 292                         break;
 293                 }
 294
 295                 ret |= ieee80211_chandef_downgrade(chandef);
 296         }
 297
 298         if (chandef->width != vht_chandef.width && !tracking)
 299                 sdata_info(sdata,
 300                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 301
 302         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 303         return ret;
 304 }
 305
 306 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 307                                struct sta_info *sta,
 308                                const struct ieee80211_ht_operation *ht_oper,
 309                                const struct ieee80211_vht_operation *vht_oper,
 310                                const u8 *bssid, u32 *changed)
 311 {
 312         struct ieee80211_local *local = sdata->local;
 313         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 314         struct ieee80211_supported_band *sband;
 315         struct ieee80211_channel *chan;
 316         struct cfg80211_chan_def chandef;
 317         u16 ht_opmode;
 318         u32 flags;
 319         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 320         int ret;
 321
 322         /* if HT was/is disabled, don't track any bandwidth changes */
 323         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 324                 return 0;
 325
 326         /* don't check VHT if we associated as non-VHT station */
 327         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 328                 vht_oper = NULL;
 329
 330         if (WARN_ON_ONCE(!sta))
 331                 return -EINVAL;
 332
 333         chan = sdata->vif.bss_conf.chandef.chan;
 334         sband = local->hw.wiphy->bands[chan->band];
 335
 336         /* calculate new channel (type) based on HT/VHT operation IEs */
 337         flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
 338                                              vht_oper, &chandef, true);
 339
 340         /*
 341          * Downgrade the new channel if we associated with restricted
 342          * capabilities. For example, if we associated as a 20 MHz STA
 343          * to a 40 MHz AP (due to regulatory, capabilities or config
 344          * reasons) then switching to a 40 MHz channel now won't do us
 345          * any good -- we couldn't use it with the AP.
 346          */
 347         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 348             chandef.width == NL80211_CHAN_WIDTH_80P80)
 349                 flags |= ieee80211_chandef_downgrade(&chandef);
 350         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 351             chandef.width == NL80211_CHAN_WIDTH_160)
 352                 flags |= ieee80211_chandef_downgrade(&chandef);
 353         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 354             chandef.width > NL80211_CHAN_WIDTH_20)
 355                 flags |= ieee80211_chandef_downgrade(&chandef);
 356
 357         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 358                 return 0;
 359
 360         sdata_info(sdata,
 361                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 362                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 363                    chandef.center_freq1, chandef.center_freq2);
 364
 365         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 366                                       IEEE80211_STA_DISABLE_VHT |
 367                                       IEEE80211_STA_DISABLE_40MHZ |
 368                                       IEEE80211_STA_DISABLE_80P80MHZ |
 369                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 370             !cfg80211_chandef_valid(&chandef)) {
 371                 sdata_info(sdata,
 372                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 373                            ifmgd->bssid);
 374                 return -EINVAL;
 375         }
 376
 377         switch (chandef.width) {
 378         case NL80211_CHAN_WIDTH_20_NOHT:
 379         case NL80211_CHAN_WIDTH_20:
 380                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 381                 break;
 382         case NL80211_CHAN_WIDTH_40:
 383                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 384                 break;
 385         case NL80211_CHAN_WIDTH_80:
 386                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 387                 break;
 388         case NL80211_CHAN_WIDTH_80P80:
 389         case NL80211_CHAN_WIDTH_160:
 390                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 391                 break;
 392         default:
 393                 return -EINVAL;
 394         }
 395
 396         if (new_sta_bw > sta->cur_max_bandwidth)
 397                 new_sta_bw = sta->cur_max_bandwidth;
 398
 399         if (new_sta_bw < sta->sta.bandwidth) {
 400                 sta->sta.bandwidth = new_sta_bw;
 401                 rate_control_rate_update(local, sband, sta,
 402                                          IEEE80211_RC_BW_CHANGED);
 403         }
 404
 405         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 406         if (ret) {
 407                 sdata_info(sdata,
 408                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 409                            ifmgd->bssid);
 410                 return ret;
 411         }
 412
 413         if (new_sta_bw > sta->sta.bandwidth) {
 414                 sta->sta.bandwidth = new_sta_bw;
 415                 rate_control_rate_update(local, sband, sta,
 416                                          IEEE80211_RC_BW_CHANGED);
 417         }
 418
 419         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 420
 421         /* if bss configuration changed store the new one */
 422         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 423                 *changed |= BSS_CHANGED_HT;
 424                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 425         }
 426
 427         return 0;
 428 }
 429
 430 /* frame sending functions */
 431
 432 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 433                                 struct sk_buff *skb, u8 ap_ht_param,
 434                                 struct ieee80211_supported_band *sband,
 435                                 struct ieee80211_channel *channel,
 436                                 enum ieee80211_smps_mode smps)
 437 {
 438         u8 *pos;
 439         u32 flags = channel->flags;
 440         u16 cap;
 441         struct ieee80211_sta_ht_cap ht_cap;
 442
 443         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 444
 445         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 446         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 447
 448         /* determine capability flags */
 449         cap = ht_cap.cap;
 450
 451         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 452         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 453                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 454                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 455                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 456                 }
 457                 break;
 458         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 459                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 460                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 461                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 462                 }
 463                 break;
 464         }
 465
 466         /*
 467          * If 40 MHz was disabled associate as though we weren't
 468          * capable of 40 MHz -- some broken APs will never fall
 469          * back to trying to transmit in 20 MHz.
 470          */
 471         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 472                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 473                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 474         }
 475
 476         /* set SM PS mode properly */
 477         cap &= ~IEEE80211_HT_CAP_SM_PS;
 478         switch (smps) {
 479         case IEEE80211_SMPS_AUTOMATIC:
 480         case IEEE80211_SMPS_NUM_MODES:
 481                 WARN_ON(1);
 482         case IEEE80211_SMPS_OFF:
 483                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 484                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 485                 break;
 486         case IEEE80211_SMPS_STATIC:
 487                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 488                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 489                 break;
 490         case IEEE80211_SMPS_DYNAMIC:
 491                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 492                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 493                 break;
 494         }
 495
 496         /* reserve and fill IE */
 497         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 498         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 499 }
 500
 501 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 502                                  struct sk_buff *skb,
 503                                  struct ieee80211_supported_band *sband,
 504                                  struct ieee80211_vht_cap *ap_vht_cap)
 505 {
 506         u8 *pos;
 507         u32 cap;
 508         struct ieee80211_sta_vht_cap vht_cap;
 509
 510         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 511
 512         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 513         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 514
 515         /* determine capability flags */
 516         cap = vht_cap.cap;
 517
 518         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 519                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 520                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 521         }
 522
 523         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 524                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 525                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 526         }
 527
 528         /*
 529          * Some APs apparently get confused if our capabilities are better
 530          * than theirs, so restrict what we advertise in the assoc request.
 531          */
 532         if (!(ap_vht_cap->vht_cap_info &
 533                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 534                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 535
 536         /* reserve and fill IE */
 537         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 538         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 539 }
 540
 541 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 542 {
 543         struct ieee80211_local *local = sdata->local;
 544         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 545         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 546         struct sk_buff *skb;
 547         struct ieee80211_mgmt *mgmt;
 548         u8 *pos, qos_info;
 549         size_t offset = 0, noffset;
 550         int i, count, rates_len, supp_rates_len, shift;
 551         u16 capab;
 552         struct ieee80211_supported_band *sband;
 553         struct ieee80211_chanctx_conf *chanctx_conf;
 554         struct ieee80211_channel *chan;
 555         u32 rate_flags, rates = 0;
 556
 557         sdata_assert_lock(sdata);
 558
 559         rcu_read_lock();
 560         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 561         if (WARN_ON(!chanctx_conf)) {
 562                 rcu_read_unlock();
 563                 return;
 564         }
 565         chan = chanctx_conf->def.chan;
 566         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 567         rcu_read_unlock();
 568         sband = local->hw.wiphy->bands[chan->band];
 569         shift = ieee80211_vif_get_shift(&sdata->vif);
 570
 571         if (assoc_data->supp_rates_len) {
 572                 /*
 573                  * Get all rates supported by the device and the AP as
 574                  * some APs don't like getting a superset of their rates
 575                  * in the association request (e.g. D-Link DAP 1353 in
 576                  * b-only mode)...
 577                  */
 578                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 579                                                      assoc_data->supp_rates,
 580                                                      assoc_data->supp_rates_len,
 581                                                      &rates);
 582         } else {
 583                 /*
 584                  * In case AP not provide any supported rates information
 585                  * before association, we send information element(s) with
 586                  * all rates that we support.
 587                  */
 588                 rates_len = 0;
 589                 for (i = 0; i < sband->n_bitrates; i++) {
 590                         if ((rate_flags & sband->bitrates[i].flags)
 591                             != rate_flags)
 592                                 continue;
 593                         rates |= BIT(i);
 594                         rates_len++;
 595                 }
 596         }
 597
 598         skb = alloc_skb(local->hw.extra_tx_headroom +
 599                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 600                         2 + assoc_data->ssid_len + /* SSID */
 601                         4 + rates_len + /* (extended) rates */
 602                         4 + /* power capability */
 603                         2 + 2 * sband->n_channels + /* supported channels */
 604                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 605                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 606                         assoc_data->ie_len + /* extra IEs */
 607                         9, /* WMM */
 608                         GFP_KERNEL);
 609         if (!skb)
 610                 return;
 611
 612         skb_reserve(skb, local->hw.extra_tx_headroom);
 613
 614         capab = WLAN_CAPABILITY_ESS;
 615
 616         if (sband->band == IEEE80211_BAND_2GHZ) {
 617                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 618                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 619                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 620                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 621         }
 622
 623         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 624                 capab |= WLAN_CAPABILITY_PRIVACY;
 625
 626         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 627             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 628                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 629
 630         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 631         memset(mgmt, 0, 24);
 632         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 633         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 634         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 635
 636         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 637                 skb_put(skb, 10);
 638                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 639                                                   IEEE80211_STYPE_REASSOC_REQ);
 640                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 641                 mgmt->u.reassoc_req.listen_interval =
 642                                 cpu_to_le16(local->hw.conf.listen_interval);
 643                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 644                        ETH_ALEN);
 645         } else {
 646                 skb_put(skb, 4);
 647                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 648                                                   IEEE80211_STYPE_ASSOC_REQ);
 649                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 650                 mgmt->u.assoc_req.listen_interval =
 651                                 cpu_to_le16(local->hw.conf.listen_interval);
 652         }
 653
 654         /* SSID */
 655         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 656         *pos++ = WLAN_EID_SSID;
 657         *pos++ = assoc_data->ssid_len;
 658         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 659
 660         /* add all rates which were marked to be used above */
 661         supp_rates_len = rates_len;
 662         if (supp_rates_len > 8)
 663                 supp_rates_len = 8;
 664
 665         pos = skb_put(skb, supp_rates_len + 2);
 666         *pos++ = WLAN_EID_SUPP_RATES;
 667         *pos++ = supp_rates_len;
 668
 669         count = 0;
 670         for (i = 0; i < sband->n_bitrates; i++) {
 671                 if (BIT(i) & rates) {
 672                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 673                                                 5 * (1 << shift));
 674                         *pos++ = (u8) rate;
 675                         if (++count == 8)
 676                                 break;
 677                 }
 678         }
 679
 680         if (rates_len > count) {
 681                 pos = skb_put(skb, rates_len - count + 2);
 682                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 683                 *pos++ = rates_len - count;
 684
 685                 for (i++; i < sband->n_bitrates; i++) {
 686                         if (BIT(i) & rates) {
 687                                 int rate;
 688                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 689                                                     5 * (1 << shift));
 690                                 *pos++ = (u8) rate;
 691                         }
 692                 }
 693         }
 694
 695         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 696                 /* 1. power capabilities */
 697                 pos = skb_put(skb, 4);
 698                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 699                 *pos++ = 2;
 700                 *pos++ = 0; /* min tx power */
 701                  /* max tx power */
 702                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 703
 704                 /* 2. supported channels */
 705                 /* TODO: get this in reg domain format */
 706                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 707                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 708                 *pos++ = 2 * sband->n_channels;
 709                 for (i = 0; i < sband->n_channels; i++) {
 710                         *pos++ = ieee80211_frequency_to_channel(
 711                                         sband->channels[i].center_freq);
 712                         *pos++ = 1; /* one channel in the subband*/
 713                 }
 714         }
 715
 716         /* if present, add any custom IEs that go before HT */
 717         if (assoc_data->ie_len && assoc_data->ie) {
 718                 static const u8 before_ht[] = {
 719                         WLAN_EID_SSID,
 720                         WLAN_EID_SUPP_RATES,
 721                         WLAN_EID_EXT_SUPP_RATES,
 722                         WLAN_EID_PWR_CAPABILITY,
 723                         WLAN_EID_SUPPORTED_CHANNELS,
 724                         WLAN_EID_RSN,
 725                         WLAN_EID_QOS_CAPA,
 726                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 727                         WLAN_EID_MOBILITY_DOMAIN,
 728                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 729                 };
 730                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 731                                              before_ht, ARRAY_SIZE(before_ht),
 732                                              offset);
 733                 pos = skb_put(skb, noffset - offset);
 734                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 735                 offset = noffset;
 736         }
 737
 738         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 739                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 740                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 741
 742         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 743                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 744                                     sband, chan, sdata->smps_mode);
 745
 746         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 747                 ieee80211_add_vht_ie(sdata, skb, sband,
 748                                      &assoc_data->ap_vht_cap);
 749
 750         /* if present, add any custom non-vendor IEs that go after HT */
 751         if (assoc_data->ie_len && assoc_data->ie) {
 752                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 753                                                     assoc_data->ie_len,
 754                                                     offset);
 755                 pos = skb_put(skb, noffset - offset);
 756                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 757                 offset = noffset;
 758         }
 759
 760         if (assoc_data->wmm) {
 761                 if (assoc_data->uapsd) {
 762                         qos_info = ifmgd->uapsd_queues;
 763                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 764                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 765                 } else {
 766                         qos_info = 0;
 767                 }
 768
 769                 pos = skb_put(skb, 9);
 770                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 771                 *pos++ = 7; /* len */
 772                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 773                 *pos++ = 0x50;
 774                 *pos++ = 0xf2;
 775                 *pos++ = 2; /* WME */
 776                 *pos++ = 0; /* WME info */
 777                 *pos++ = 1; /* WME ver */
 778                 *pos++ = qos_info;
 779         }
 780
 781         /* add any remaining custom (i.e. vendor specific here) IEs */
 782         if (assoc_data->ie_len && assoc_data->ie) {
 783                 noffset = assoc_data->ie_len;
 784                 pos = skb_put(skb, noffset - offset);
 785                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 786         }
 787
 788         drv_mgd_prepare_tx(local, sdata);
 789
 790         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 791         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 792                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 793                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 794         ieee80211_tx_skb(sdata, skb);
 795 }
 796
 797 void ieee80211_send_pspoll(struct ieee80211_local *local,
 798                            struct ieee80211_sub_if_data *sdata)
 799 {
 800         struct ieee80211_pspoll *pspoll;
 801         struct sk_buff *skb;
 802
 803         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 804         if (!skb)
 805                 return;
 806
 807         pspoll = (struct ieee80211_pspoll *) skb->data;
 808         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 809
 810         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 811         ieee80211_tx_skb(sdata, skb);
 812 }
 813
 814 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 815                              struct ieee80211_sub_if_data *sdata,
 816                              int powersave)
 817 {
 818         struct sk_buff *skb;
 819         struct ieee80211_hdr_3addr *nullfunc;
 820         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 821
 822         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 823         if (!skb)
 824                 return;
 825
 826         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 827         if (powersave)
 828                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 829
 830         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 831                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 832
 833         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 834                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 835
 836         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 837                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 838
 839         ieee80211_tx_skb(sdata, skb);
 840 }
 841
 842 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 843                                           struct ieee80211_sub_if_data *sdata)
 844 {
 845         struct sk_buff *skb;
 846         struct ieee80211_hdr *nullfunc;
 847         __le16 fc;
 848
 849         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 850                 return;
 851
 852         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 853         if (!skb)
 854                 return;
 855
 856         skb_reserve(skb, local->hw.extra_tx_headroom);
 857
 858         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 859         memset(nullfunc, 0, 30);
 860         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 861                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 862         nullfunc->frame_control = fc;
 863         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 864         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 865         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 866         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 867
 868         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 869         ieee80211_tx_skb(sdata, skb);
 870 }
 871
 872 /* spectrum management related things */
 873 static void ieee80211_chswitch_work(struct work_struct *work)
 874 {
 875         struct ieee80211_sub_if_data *sdata =
 876                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 877         struct ieee80211_local *local = sdata->local;
 878         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 879         u32 changed = 0;
 880         int ret;
 881
 882         if (!ieee80211_sdata_running(sdata))
 883                 return;
 884
 885         sdata_lock(sdata);
 886         if (!ifmgd->associated)
 887                 goto out;
 888
 889         ret = ieee80211_vif_change_channel(sdata, &local->csa_chandef,
 890                                            &changed);
 891         if (ret) {
 892                 sdata_info(sdata,
 893                            "vif channel switch failed, disconnecting\n");
 894                 ieee80211_queue_work(&sdata->local->hw,
 895                                      &ifmgd->csa_connection_drop_work);
 896                 goto out;
 897         }
 898
 899         if (!local->use_chanctx) {
 900                 local->_oper_chandef = local->csa_chandef;
 901                 /* Call "hw_config" only if doing sw channel switch.
 902                  * Otherwise update the channel directly
 903                  */
 904                 if (!local->ops->channel_switch)
 905                         ieee80211_hw_config(local, 0);
 906                 else
 907                         local->hw.conf.chandef = local->_oper_chandef;
 908         }
 909
 910         /* XXX: shouldn't really modify cfg80211-owned data! */
 911         ifmgd->associated->channel = local->csa_chandef.chan;
 912
 913         /* XXX: wait for a beacon first? */
 914         ieee80211_wake_queues_by_reason(&local->hw,
 915                                         IEEE80211_MAX_QUEUE_MAP,
 916                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 917
 918         ieee80211_bss_info_change_notify(sdata, changed);
 919
 920  out:
 921         sdata->vif.csa_active = false;
 922         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 923         sdata_unlock(sdata);
 924 }
 925
 926 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 927 {
 928         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 929         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 930
 931         trace_api_chswitch_done(sdata, success);
 932         if (!success) {
 933                 sdata_info(sdata,
 934                            "driver channel switch failed, disconnecting\n");
 935                 ieee80211_queue_work(&sdata->local->hw,
 936                                      &ifmgd->csa_connection_drop_work);
 937         } else {
 938                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 939         }
 940 }
 941 EXPORT_SYMBOL(ieee80211_chswitch_done);
 942
 943 static void ieee80211_chswitch_timer(unsigned long data)
 944 {
 945         struct ieee80211_sub_if_data *sdata =
 946                 (struct ieee80211_sub_if_data *) data;
 947
 948         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
 949 }
 950
 951 static void
 952 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 953                                  u64 timestamp, struct ieee802_11_elems *elems,
 954                                  bool beacon)
 955 {
 956         struct ieee80211_local *local = sdata->local;
 957         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 958         struct cfg80211_bss *cbss = ifmgd->associated;
 959         struct ieee80211_chanctx *chanctx;
 960         enum ieee80211_band current_band;
 961         struct ieee80211_csa_ie csa_ie;
 962         int res;
 963
 964         sdata_assert_lock(sdata);
 965
 966         if (!cbss)
 967                 return;
 968
 969         if (local->scanning)
 970                 return;
 971
 972         /* disregard subsequent announcements if we are already processing */
 973         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 974                 return;
 975
 976         current_band = cbss->channel->band;
 977         memset(&csa_ie, 0, sizeof(csa_ie));
 978         res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
 979                                            ifmgd->flags,
 980                                            ifmgd->associated->bssid, &csa_ie);
 981         if (res < 0)
 982                 ieee80211_queue_work(&local->hw,
 983                                      &ifmgd->csa_connection_drop_work);
 984         if (res)
 985                 return;
 986
 987         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
 988                                      IEEE80211_CHAN_DISABLED)) {
 989                 sdata_info(sdata,
 990                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 991                            ifmgd->associated->bssid,
 992                            csa_ie.chandef.chan->center_freq,
 993                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
 994                            csa_ie.chandef.center_freq2);
 995                 ieee80211_queue_work(&local->hw,
 996                                      &ifmgd->csa_connection_drop_work);
 997                 return;
 998         }
 999
1000         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1001         sdata->vif.csa_active = true;
1002
1003         mutex_lock(&local->chanctx_mtx);
1004         if (local->use_chanctx) {
1005                 u32 num_chanctx = 0;
1006                 list_for_each_entry(chanctx, &local->chanctx_list, list)
1007                        num_chanctx++;
1008
1009                 if (num_chanctx > 1 ||
1010                     !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1011                         sdata_info(sdata,
1012                                    "not handling chan-switch with channel contexts\n");
1013                         ieee80211_queue_work(&local->hw,
1014                                              &ifmgd->csa_connection_drop_work);
1015                         mutex_unlock(&local->chanctx_mtx);
1016                         return;
1017                 }
1018         }
1019
1020         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1021                 ieee80211_queue_work(&local->hw,
1022                                      &ifmgd->csa_connection_drop_work);
1023                 mutex_unlock(&local->chanctx_mtx);
1024                 return;
1025         }
1026         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1027                                struct ieee80211_chanctx, conf);
1028         if (chanctx->refcount > 1) {
1029                 sdata_info(sdata,
1030                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
1031                 ieee80211_queue_work(&local->hw,
1032                                      &ifmgd->csa_connection_drop_work);
1033                 mutex_unlock(&local->chanctx_mtx);
1034                 return;
1035         }
1036         mutex_unlock(&local->chanctx_mtx);
1037
1038         local->csa_chandef = csa_ie.chandef;
1039
1040         if (csa_ie.mode)
1041                 ieee80211_stop_queues_by_reason(&local->hw,
1042                                 IEEE80211_MAX_QUEUE_MAP,
1043                                 IEEE80211_QUEUE_STOP_REASON_CSA);
1044
1045         if (local->ops->channel_switch) {
1046                 /* use driver's channel switch callback */
1047                 struct ieee80211_channel_switch ch_switch = {
1048                         .timestamp = timestamp,
1049                         .block_tx = csa_ie.mode,
1050                         .chandef = csa_ie.chandef,
1051                         .count = csa_ie.count,
1052                 };
1053
1054                 drv_channel_switch(local, &ch_switch);
1055                 return;
1056         }
1057
1058         /* channel switch handled in software */
1059         if (csa_ie.count <= 1)
1060                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1061         else
1062                 mod_timer(&ifmgd->chswitch_timer,
1063                           TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1064 }
1065
1066 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1067                                        struct ieee80211_channel *channel,
1068                                        const u8 *country_ie, u8 country_ie_len,
1069                                        const u8 *pwr_constr_elem)
1070 {
1071         struct ieee80211_country_ie_triplet *triplet;
1072         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1073         int i, chan_pwr, chan_increment, new_ap_level;
1074         bool have_chan_pwr = false;
1075
1076         /* Invalid IE */
1077         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1078                 return 0;
1079
1080         triplet = (void *)(country_ie + 3);
1081         country_ie_len -= 3;
1082
1083         switch (channel->band) {
1084         default:
1085                 WARN_ON_ONCE(1);
1086                 /* fall through */
1087         case IEEE80211_BAND_2GHZ:
1088         case IEEE80211_BAND_60GHZ:
1089                 chan_increment = 1;
1090                 break;
1091         case IEEE80211_BAND_5GHZ:
1092                 chan_increment = 4;
1093                 break;
1094         }
1095
1096         /* find channel */
1097         while (country_ie_len >= 3) {
1098                 u8 first_channel = triplet->chans.first_channel;
1099
1100                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1101                         goto next;
1102
1103                 for (i = 0; i < triplet->chans.num_channels; i++) {
1104                         if (first_channel + i * chan_increment == chan) {
1105                                 have_chan_pwr = true;
1106                                 chan_pwr = triplet->chans.max_power;
1107                                 break;
1108                         }
1109                 }
1110                 if (have_chan_pwr)
1111                         break;
1112
1113  next:
1114                 triplet++;
1115                 country_ie_len -= 3;
1116         }
1117
1118         if (!have_chan_pwr)
1119                 return 0;
1120
1121         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1122
1123         if (sdata->ap_power_level == new_ap_level)
1124                 return 0;
1125
1126         sdata_info(sdata,
1127                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1128                    new_ap_level, chan_pwr, *pwr_constr_elem,
1129                    sdata->u.mgd.bssid);
1130         sdata->ap_power_level = new_ap_level;
1131         if (__ieee80211_recalc_txpower(sdata))
1132                 return BSS_CHANGED_TXPOWER;
1133         return 0;
1134 }
1135
1136 /* powersave */
1137 static void ieee80211_enable_ps(struct ieee80211_local *local,
1138                                 struct ieee80211_sub_if_data *sdata)
1139 {
1140         struct ieee80211_conf *conf = &local->hw.conf;
1141
1142         /*
1143          * If we are scanning right now then the parameters will
1144          * take effect when scan finishes.
1145          */
1146         if (local->scanning)
1147                 return;
1148
1149         if (conf->dynamic_ps_timeout > 0 &&
1150             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1151                 mod_timer(&local->dynamic_ps_timer, jiffies +
1152                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1153         } else {
1154                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1155                         ieee80211_send_nullfunc(local, sdata, 1);
1156
1157                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1158                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1159                         return;
1160
1161                 conf->flags |= IEEE80211_CONF_PS;
1162                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1163         }
1164 }
1165
1166 static void ieee80211_change_ps(struct ieee80211_local *local)
1167 {
1168         struct ieee80211_conf *conf = &local->hw.conf;
1169
1170         if (local->ps_sdata) {
1171                 ieee80211_enable_ps(local, local->ps_sdata);
1172         } else if (conf->flags & IEEE80211_CONF_PS) {
1173                 conf->flags &= ~IEEE80211_CONF_PS;
1174                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1175                 del_timer_sync(&local->dynamic_ps_timer);
1176                 cancel_work_sync(&local->dynamic_ps_enable_work);
1177         }
1178 }
1179
1180 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1181 {
1182         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1183         struct sta_info *sta = NULL;
1184         bool authorized = false;
1185
1186         if (!mgd->powersave)
1187                 return false;
1188
1189         if (mgd->broken_ap)
1190                 return false;
1191
1192         if (!mgd->associated)
1193                 return false;
1194
1195         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1196                 return false;
1197
1198         if (!mgd->have_beacon)
1199                 return false;
1200
1201         rcu_read_lock();
1202         sta = sta_info_get(sdata, mgd->bssid);
1203         if (sta)
1204                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1205         rcu_read_unlock();
1206
1207         return authorized;
1208 }
1209
1210 /* need to hold RTNL or interface lock */
1211 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1212 {
1213         struct ieee80211_sub_if_data *sdata, *found = NULL;
1214         int count = 0;
1215         int timeout;
1216
1217         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1218                 local->ps_sdata = NULL;
1219                 return;
1220         }
1221
1222         list_for_each_entry(sdata, &local->interfaces, list) {
1223                 if (!ieee80211_sdata_running(sdata))
1224                         continue;
1225                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1226                         /* If an AP vif is found, then disable PS
1227                          * by setting the count to zero thereby setting
1228                          * ps_sdata to NULL.
1229                          */
1230                         count = 0;
1231                         break;
1232                 }
1233                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1234                         continue;
1235                 found = sdata;
1236                 count++;
1237         }
1238
1239         if (count == 1 && ieee80211_powersave_allowed(found)) {
1240                 s32 beaconint_us;
1241
1242                 if (latency < 0)
1243                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1244
1245                 beaconint_us = ieee80211_tu_to_usec(
1246                                         found->vif.bss_conf.beacon_int);
1247
1248                 timeout = local->dynamic_ps_forced_timeout;
1249                 if (timeout < 0) {
1250                         /*
1251                          * Go to full PSM if the user configures a very low
1252                          * latency requirement.
1253                          * The 2000 second value is there for compatibility
1254                          * until the PM_QOS_NETWORK_LATENCY is configured
1255                          * with real values.
1256                          */
1257                         if (latency > (1900 * USEC_PER_MSEC) &&
1258                             latency != (2000 * USEC_PER_SEC))
1259                                 timeout = 0;
1260                         else
1261                                 timeout = 100;
1262                 }
1263                 local->hw.conf.dynamic_ps_timeout = timeout;
1264
1265                 if (beaconint_us > latency) {
1266                         local->ps_sdata = NULL;
1267                 } else {
1268                         int maxslp = 1;
1269                         u8 dtimper = found->u.mgd.dtim_period;
1270
1271                         /* If the TIM IE is invalid, pretend the value is 1 */
1272                         if (!dtimper)
1273                                 dtimper = 1;
1274                         else if (dtimper > 1)
1275                                 maxslp = min_t(int, dtimper,
1276                                                     latency / beaconint_us);
1277
1278                         local->hw.conf.max_sleep_period = maxslp;
1279                         local->hw.conf.ps_dtim_period = dtimper;
1280                         local->ps_sdata = found;
1281                 }
1282         } else {
1283                 local->ps_sdata = NULL;
1284         }
1285
1286         ieee80211_change_ps(local);
1287 }
1288
1289 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1290 {
1291         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1292
1293         if (sdata->vif.bss_conf.ps != ps_allowed) {
1294                 sdata->vif.bss_conf.ps = ps_allowed;
1295                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1296         }
1297 }
1298
1299 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1300 {
1301         struct ieee80211_local *local =
1302                 container_of(work, struct ieee80211_local,
1303                              dynamic_ps_disable_work);
1304
1305         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1306                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1307                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1308         }
1309
1310         ieee80211_wake_queues_by_reason(&local->hw,
1311                                         IEEE80211_MAX_QUEUE_MAP,
1312                                         IEEE80211_QUEUE_STOP_REASON_PS);
1313 }
1314
1315 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1316 {
1317         struct ieee80211_local *local =
1318                 container_of(work, struct ieee80211_local,
1319                              dynamic_ps_enable_work);
1320         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1321         struct ieee80211_if_managed *ifmgd;
1322         unsigned long flags;
1323         int q;
1324
1325         /* can only happen when PS was just disabled anyway */
1326         if (!sdata)
1327                 return;
1328
1329         ifmgd = &sdata->u.mgd;
1330
1331         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1332                 return;
1333
1334         if (local->hw.conf.dynamic_ps_timeout > 0) {
1335                 /* don't enter PS if TX frames are pending */
1336                 if (drv_tx_frames_pending(local)) {
1337                         mod_timer(&local->dynamic_ps_timer, jiffies +
1338                                   msecs_to_jiffies(
1339                                   local->hw.conf.dynamic_ps_timeout));
1340                         return;
1341                 }
1342
1343                 /*
1344                  * transmission can be stopped by others which leads to
1345                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1346                  * is not the actual idle state.
1347                  */
1348                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1349                 for (q = 0; q < local->hw.queues; q++) {
1350                         if (local->queue_stop_reasons[q]) {
1351                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1352                                                        flags);
1353                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1354                                           msecs_to_jiffies(
1355                                           local->hw.conf.dynamic_ps_timeout));
1356                                 return;
1357                         }
1358                 }
1359                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1360         }
1361
1362         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1363             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1364                 if (drv_tx_frames_pending(local)) {
1365                         mod_timer(&local->dynamic_ps_timer, jiffies +
1366                                   msecs_to_jiffies(
1367                                   local->hw.conf.dynamic_ps_timeout));
1368                 } else {
1369                         ieee80211_send_nullfunc(local, sdata, 1);
1370                         /* Flush to get the tx status of nullfunc frame */
1371                         ieee80211_flush_queues(local, sdata);
1372                 }
1373         }
1374
1375         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1376               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1377             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1378                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1379                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1380                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1381         }
1382 }
1383
1384 void ieee80211_dynamic_ps_timer(unsigned long data)
1385 {
1386         struct ieee80211_local *local = (void *) data;
1387
1388         if (local->quiescing || local->suspended)
1389                 return;
1390
1391         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1392 }
1393
1394 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1395 {
1396         struct delayed_work *delayed_work =
1397                 container_of(work, struct delayed_work, work);
1398         struct ieee80211_sub_if_data *sdata =
1399                 container_of(delayed_work, struct ieee80211_sub_if_data,
1400                              dfs_cac_timer_work);
1401
1402         ieee80211_vif_release_channel(sdata);
1403
1404         cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL);
1405 }
1406
1407 /* MLME */
1408 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1409                                      struct ieee80211_sub_if_data *sdata,
1410                                      const u8 *wmm_param, size_t wmm_param_len)
1411 {
1412         struct ieee80211_tx_queue_params params;
1413         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1414         size_t left;
1415         int count;
1416         const u8 *pos;
1417         u8 uapsd_queues = 0;
1418
1419         if (!local->ops->conf_tx)
1420                 return false;
1421
1422         if (local->hw.queues < IEEE80211_NUM_ACS)
1423                 return false;
1424
1425         if (!wmm_param)
1426                 return false;
1427
1428         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1429                 return false;
1430
1431         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1432                 uapsd_queues = ifmgd->uapsd_queues;
1433
1434         count = wmm_param[6] & 0x0f;
1435         if (count == ifmgd->wmm_last_param_set)
1436                 return false;
1437         ifmgd->wmm_last_param_set = count;
1438
1439         pos = wmm_param + 8;
1440         left = wmm_param_len - 8;
1441
1442         memset(&params, 0, sizeof(params));
1443
1444         sdata->wmm_acm = 0;
1445         for (; left >= 4; left -= 4, pos += 4) {
1446                 int aci = (pos[0] >> 5) & 0x03;
1447                 int acm = (pos[0] >> 4) & 0x01;
1448                 bool uapsd = false;
1449                 int queue;
1450
1451                 switch (aci) {
1452                 case 1: /* AC_BK */
1453                         queue = 3;
1454                         if (acm)
1455                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1456                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1457                                 uapsd = true;
1458                         break;
1459                 case 2: /* AC_VI */
1460                         queue = 1;
1461                         if (acm)
1462                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1463                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1464                                 uapsd = true;
1465                         break;
1466                 case 3: /* AC_VO */
1467                         queue = 0;
1468                         if (acm)
1469                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1470                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1471                                 uapsd = true;
1472                         break;
1473                 case 0: /* AC_BE */
1474                 default:
1475                         queue = 2;
1476                         if (acm)
1477                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1478                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1479                                 uapsd = true;
1480                         break;
1481                 }
1482
1483                 params.aifs = pos[0] & 0x0f;
1484                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1485                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1486                 params.txop = get_unaligned_le16(pos + 2);
1487                 params.acm = acm;
1488                 params.uapsd = uapsd;
1489
1490                 mlme_dbg(sdata,
1491                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1492                          queue, aci, acm,
1493                          params.aifs, params.cw_min, params.cw_max,
1494                          params.txop, params.uapsd);
1495                 sdata->tx_conf[queue] = params;
1496                 if (drv_conf_tx(local, sdata, queue, &params))
1497                         sdata_err(sdata,
1498                                   "failed to set TX queue parameters for queue %d\n",
1499                                   queue);
1500         }
1501
1502         /* enable WMM or activate new settings */
1503         sdata->vif.bss_conf.qos = true;
1504         return true;
1505 }
1506
1507 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1508 {
1509         lockdep_assert_held(&sdata->local->mtx);
1510
1511         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1512         ieee80211_run_deferred_scan(sdata->local);
1513 }
1514
1515 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1516 {
1517         mutex_lock(&sdata->local->mtx);
1518         __ieee80211_stop_poll(sdata);
1519         mutex_unlock(&sdata->local->mtx);
1520 }
1521
1522 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1523                                            u16 capab, bool erp_valid, u8 erp)
1524 {
1525         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1526         u32 changed = 0;
1527         bool use_protection;
1528         bool use_short_preamble;
1529         bool use_short_slot;
1530
1531         if (erp_valid) {
1532                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1533                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1534         } else {
1535                 use_protection = false;
1536                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1537         }
1538
1539         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1540         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1541                 use_short_slot = true;
1542
1543         if (use_protection != bss_conf->use_cts_prot) {
1544                 bss_conf->use_cts_prot = use_protection;
1545                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1546         }
1547
1548         if (use_short_preamble != bss_conf->use_short_preamble) {
1549                 bss_conf->use_short_preamble = use_short_preamble;
1550                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1551         }
1552
1553         if (use_short_slot != bss_conf->use_short_slot) {
1554                 bss_conf->use_short_slot = use_short_slot;
1555                 changed |= BSS_CHANGED_ERP_SLOT;
1556         }
1557
1558         return changed;
1559 }
1560
1561 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1562                                      struct cfg80211_bss *cbss,
1563                                      u32 bss_info_changed)
1564 {
1565         struct ieee80211_bss *bss = (void *)cbss->priv;
1566         struct ieee80211_local *local = sdata->local;
1567         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1568
1569         bss_info_changed |= BSS_CHANGED_ASSOC;
1570         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1571                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1572
1573         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1574                 beacon_loss_count * bss_conf->beacon_int));
1575
1576         sdata->u.mgd.associated = cbss;
1577         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1578
1579         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1580
1581         if (sdata->vif.p2p) {
1582                 const struct cfg80211_bss_ies *ies;
1583
1584                 rcu_read_lock();
1585                 ies = rcu_dereference(cbss->ies);
1586                 if (ies) {
1587                         int ret;
1588
1589                         ret = cfg80211_get_p2p_attr(
1590                                         ies->data, ies->len,
1591                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1592                                         (u8 *) &bss_conf->p2p_noa_attr,
1593                                         sizeof(bss_conf->p2p_noa_attr));
1594                         if (ret >= 2) {
1595                                 sdata->u.mgd.p2p_noa_index =
1596                                         bss_conf->p2p_noa_attr.index;
1597                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1598                         }
1599                 }
1600                 rcu_read_unlock();
1601         }
1602
1603         /* just to be sure */
1604         ieee80211_stop_poll(sdata);
1605
1606         ieee80211_led_assoc(local, 1);
1607
1608         if (sdata->u.mgd.have_beacon) {
1609                 /*
1610                  * If the AP is buggy we may get here with no DTIM period
1611                  * known, so assume it's 1 which is the only safe assumption
1612                  * in that case, although if the TIM IE is broken powersave
1613                  * probably just won't work at all.
1614                  */
1615                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1616                 bss_conf->beacon_rate = bss->beacon_rate;
1617                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1618         } else {
1619                 bss_conf->beacon_rate = NULL;
1620                 bss_conf->dtim_period = 0;
1621         }
1622
1623         bss_conf->assoc = 1;
1624
1625         /* Tell the driver to monitor connection quality (if supported) */
1626         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1627             bss_conf->cqm_rssi_thold)
1628                 bss_info_changed |= BSS_CHANGED_CQM;
1629
1630         /* Enable ARP filtering */
1631         if (bss_conf->arp_addr_cnt)
1632                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1633
1634         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1635
1636         mutex_lock(&local->iflist_mtx);
1637         ieee80211_recalc_ps(local, -1);
1638         mutex_unlock(&local->iflist_mtx);
1639
1640         ieee80211_recalc_smps(sdata);
1641         ieee80211_recalc_ps_vif(sdata);
1642
1643         netif_carrier_on(sdata->dev);
1644 }
1645
1646 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1647                                    u16 stype, u16 reason, bool tx,
1648                                    u8 *frame_buf)
1649 {
1650         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1651         struct ieee80211_local *local = sdata->local;
1652         u32 changed = 0;
1653
1654         sdata_assert_lock(sdata);
1655
1656         if (WARN_ON_ONCE(tx && !frame_buf))
1657                 return;
1658
1659         if (WARN_ON(!ifmgd->associated))
1660                 return;
1661
1662         ieee80211_stop_poll(sdata);
1663
1664         ifmgd->associated = NULL;
1665         netif_carrier_off(sdata->dev);
1666
1667         /*
1668          * if we want to get out of ps before disassoc (why?) we have
1669          * to do it before sending disassoc, as otherwise the null-packet
1670          * won't be valid.
1671          */
1672         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1673                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1674                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1675         }
1676         local->ps_sdata = NULL;
1677
1678         /* disable per-vif ps */
1679         ieee80211_recalc_ps_vif(sdata);
1680
1681         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1682         if (tx)
1683                 ieee80211_flush_queues(local, sdata);
1684
1685         /* deauthenticate/disassociate now */
1686         if (tx || frame_buf)
1687                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1688                                                reason, tx, frame_buf);
1689
1690         /* flush out frame */
1691         if (tx)
1692                 ieee80211_flush_queues(local, sdata);
1693
1694         /* clear bssid only after building the needed mgmt frames */
1695         memset(ifmgd->bssid, 0, ETH_ALEN);
1696
1697         /* remove AP and TDLS peers */
1698         sta_info_flush_defer(sdata);
1699
1700         /* finally reset all BSS / config parameters */
1701         changed |= ieee80211_reset_erp_info(sdata);
1702
1703         ieee80211_led_assoc(local, 0);
1704         changed |= BSS_CHANGED_ASSOC;
1705         sdata->vif.bss_conf.assoc = false;
1706
1707         ifmgd->p2p_noa_index = -1;
1708         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1709                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1710
1711         /* on the next assoc, re-program HT/VHT parameters */
1712         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1713         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1714         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1715         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1716
1717         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1718
1719         del_timer_sync(&local->dynamic_ps_timer);
1720         cancel_work_sync(&local->dynamic_ps_enable_work);
1721
1722         /* Disable ARP filtering */
1723         if (sdata->vif.bss_conf.arp_addr_cnt)
1724                 changed |= BSS_CHANGED_ARP_FILTER;
1725
1726         sdata->vif.bss_conf.qos = false;
1727         changed |= BSS_CHANGED_QOS;
1728
1729         /* The BSSID (not really interesting) and HT changed */
1730         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1731         ieee80211_bss_info_change_notify(sdata, changed);
1732
1733         /* disassociated - set to defaults now */
1734         ieee80211_set_wmm_default(sdata, false);
1735
1736         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1737         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1738         del_timer_sync(&sdata->u.mgd.timer);
1739         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1740
1741         sdata->vif.bss_conf.dtim_period = 0;
1742         sdata->vif.bss_conf.beacon_rate = NULL;
1743
1744         ifmgd->have_beacon = false;
1745
1746         ifmgd->flags = 0;
1747         ieee80211_vif_release_channel(sdata);
1748 }
1749
1750 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1751                              struct ieee80211_hdr *hdr)
1752 {
1753         /*
1754          * We can postpone the mgd.timer whenever receiving unicast frames
1755          * from AP because we know that the connection is working both ways
1756          * at that time. But multicast frames (and hence also beacons) must
1757          * be ignored here, because we need to trigger the timer during
1758          * data idle periods for sending the periodic probe request to the
1759          * AP we're connected to.
1760          */
1761         if (is_multicast_ether_addr(hdr->addr1))
1762                 return;
1763
1764         ieee80211_sta_reset_conn_monitor(sdata);
1765 }
1766
1767 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1768 {
1769         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1770         struct ieee80211_local *local = sdata->local;
1771
1772         mutex_lock(&local->mtx);
1773         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
1774                 goto out;
1775
1776         __ieee80211_stop_poll(sdata);
1777
1778         mutex_lock(&local->iflist_mtx);
1779         ieee80211_recalc_ps(local, -1);
1780         mutex_unlock(&local->iflist_mtx);
1781
1782         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1783                 goto out;
1784
1785         /*
1786          * We've received a probe response, but are not sure whether
1787          * we have or will be receiving any beacons or data, so let's
1788          * schedule the timers again, just in case.
1789          */
1790         ieee80211_sta_reset_beacon_monitor(sdata);
1791
1792         mod_timer(&ifmgd->conn_mon_timer,
1793                   round_jiffies_up(jiffies +
1794                                    IEEE80211_CONNECTION_IDLE_TIME));
1795 out:
1796         mutex_unlock(&local->mtx);
1797 }
1798
1799 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1800                              struct ieee80211_hdr *hdr, bool ack)
1801 {
1802         if (!ieee80211_is_data(hdr->frame_control))
1803             return;
1804
1805         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1806             sdata->u.mgd.probe_send_count > 0) {
1807                 if (ack)
1808                         ieee80211_sta_reset_conn_monitor(sdata);
1809                 else
1810                         sdata->u.mgd.nullfunc_failed = true;
1811                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1812                 return;
1813         }
1814
1815         if (ack)
1816                 ieee80211_sta_reset_conn_monitor(sdata);
1817 }
1818
1819 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1820 {
1821         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1822         const u8 *ssid;
1823         u8 *dst = ifmgd->associated->bssid;
1824         u8 unicast_limit = max(1, max_probe_tries - 3);
1825
1826         /*
1827          * Try sending broadcast probe requests for the last three
1828          * probe requests after the first ones failed since some
1829          * buggy APs only support broadcast probe requests.
1830          */
1831         if (ifmgd->probe_send_count >= unicast_limit)
1832                 dst = NULL;
1833
1834         /*
1835          * When the hardware reports an accurate Tx ACK status, it's
1836          * better to send a nullfunc frame instead of a probe request,
1837          * as it will kick us off the AP quickly if we aren't associated
1838          * anymore. The timeout will be reset if the frame is ACKed by
1839          * the AP.
1840          */
1841         ifmgd->probe_send_count++;
1842
1843         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1844                 ifmgd->nullfunc_failed = false;
1845                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1846         } else {
1847                 int ssid_len;
1848
1849                 rcu_read_lock();
1850                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1851                 if (WARN_ON_ONCE(ssid == NULL))
1852                         ssid_len = 0;
1853                 else
1854                         ssid_len = ssid[1];
1855
1856                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1857                                          0, (u32) -1, true, 0,
1858                                          ifmgd->associated->channel, false);
1859                 rcu_read_unlock();
1860         }
1861
1862         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1863         run_again(sdata, ifmgd->probe_timeout);
1864         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1865                 ieee80211_flush_queues(sdata->local, sdata);
1866 }
1867
1868 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1869                                    bool beacon)
1870 {
1871         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1872         bool already = false;
1873
1874         if (!ieee80211_sdata_running(sdata))
1875                 return;
1876
1877         sdata_lock(sdata);
1878
1879         if (!ifmgd->associated)
1880                 goto out;
1881
1882         mutex_lock(&sdata->local->mtx);
1883
1884         if (sdata->local->tmp_channel || sdata->local->scanning) {
1885                 mutex_unlock(&sdata->local->mtx);
1886                 goto out;
1887         }
1888
1889         if (beacon) {
1890                 mlme_dbg_ratelimited(sdata,
1891                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
1892                                      beacon_loss_count);
1893
1894                 ieee80211_cqm_rssi_notify(&sdata->vif,
1895                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
1896                                           GFP_KERNEL);
1897         }
1898
1899         /*
1900          * The driver/our work has already reported this event or the
1901          * connection monitoring has kicked in and we have already sent
1902          * a probe request. Or maybe the AP died and the driver keeps
1903          * reporting until we disassociate...
1904          *
1905          * In either case we have to ignore the current call to this
1906          * function (except for setting the correct probe reason bit)
1907          * because otherwise we would reset the timer every time and
1908          * never check whether we received a probe response!
1909          */
1910         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
1911                 already = true;
1912
1913         mutex_unlock(&sdata->local->mtx);
1914
1915         if (already)
1916                 goto out;
1917
1918         mutex_lock(&sdata->local->iflist_mtx);
1919         ieee80211_recalc_ps(sdata->local, -1);
1920         mutex_unlock(&sdata->local->iflist_mtx);
1921
1922         ifmgd->probe_send_count = 0;
1923         ieee80211_mgd_probe_ap_send(sdata);
1924  out:
1925         sdata_unlock(sdata);
1926 }
1927
1928 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1929                                           struct ieee80211_vif *vif)
1930 {
1931         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1932         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1933         struct cfg80211_bss *cbss;
1934         struct sk_buff *skb;
1935         const u8 *ssid;
1936         int ssid_len;
1937
1938         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1939                 return NULL;
1940
1941         sdata_assert_lock(sdata);
1942
1943         if (ifmgd->associated)
1944                 cbss = ifmgd->associated;
1945         else if (ifmgd->auth_data)
1946                 cbss = ifmgd->auth_data->bss;
1947         else if (ifmgd->assoc_data)
1948                 cbss = ifmgd->assoc_data->bss;
1949         else
1950                 return NULL;
1951
1952         rcu_read_lock();
1953         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1954         if (WARN_ON_ONCE(ssid == NULL))
1955                 ssid_len = 0;
1956         else
1957                 ssid_len = ssid[1];
1958
1959         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1960                                         (u32) -1, cbss->channel,
1961                                         ssid + 2, ssid_len,
1962                                         NULL, 0, true);
1963         rcu_read_unlock();
1964
1965         return skb;
1966 }
1967 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1968
1969 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
1970 {
1971         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1972         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1973
1974         sdata_lock(sdata);
1975         if (!ifmgd->associated) {
1976                 sdata_unlock(sdata);
1977                 return;
1978         }
1979
1980         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1981                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1982                                true, frame_buf);
1983         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1984         sdata->vif.csa_active = false;
1985         ieee80211_wake_queues_by_reason(&sdata->local->hw,
1986                                         IEEE80211_MAX_QUEUE_MAP,
1987                                         IEEE80211_QUEUE_STOP_REASON_CSA);
1988
1989         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
1990                               IEEE80211_DEAUTH_FRAME_LEN);
1991         sdata_unlock(sdata);
1992 }
1993
1994 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1995 {
1996         struct ieee80211_sub_if_data *sdata =
1997                 container_of(work, struct ieee80211_sub_if_data,
1998                              u.mgd.beacon_connection_loss_work);
1999         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2000         struct sta_info *sta;
2001
2002         if (ifmgd->associated) {
2003                 rcu_read_lock();
2004                 sta = sta_info_get(sdata, ifmgd->bssid);
2005                 if (sta)
2006                         sta->beacon_loss_count++;
2007                 rcu_read_unlock();
2008         }
2009
2010         if (ifmgd->connection_loss) {
2011                 sdata_info(sdata, "Connection to AP %pM lost\n",
2012                            ifmgd->bssid);
2013                 __ieee80211_disconnect(sdata);
2014         } else {
2015                 ieee80211_mgd_probe_ap(sdata, true);
2016         }
2017 }
2018
2019 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2020 {
2021         struct ieee80211_sub_if_data *sdata =
2022                 container_of(work, struct ieee80211_sub_if_data,
2023                              u.mgd.csa_connection_drop_work);
2024
2025         __ieee80211_disconnect(sdata);
2026 }
2027
2028 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2029 {
2030         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2031         struct ieee80211_hw *hw = &sdata->local->hw;
2032
2033         trace_api_beacon_loss(sdata);
2034
2035         sdata->u.mgd.connection_loss = false;
2036         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2037 }
2038 EXPORT_SYMBOL(ieee80211_beacon_loss);
2039
2040 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2041 {
2042         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2043         struct ieee80211_hw *hw = &sdata->local->hw;
2044
2045         trace_api_connection_loss(sdata);
2046
2047         sdata->u.mgd.connection_loss = true;
2048         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2049 }
2050 EXPORT_SYMBOL(ieee80211_connection_loss);
2051
2052
2053 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2054                                         bool assoc)
2055 {
2056         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2057
2058         sdata_assert_lock(sdata);
2059
2060         if (!assoc) {
2061                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2062
2063                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2064                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2065                 sdata->u.mgd.flags = 0;
2066                 ieee80211_vif_release_channel(sdata);
2067         }
2068
2069         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2070         kfree(auth_data);
2071         sdata->u.mgd.auth_data = NULL;
2072 }
2073
2074 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2075                                      struct ieee80211_mgmt *mgmt, size_t len)
2076 {
2077         struct ieee80211_local *local = sdata->local;
2078         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2079         u8 *pos;
2080         struct ieee802_11_elems elems;
2081         u32 tx_flags = 0;
2082
2083         pos = mgmt->u.auth.variable;
2084         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2085         if (!elems.challenge)
2086                 return;
2087         auth_data->expected_transaction = 4;
2088         drv_mgd_prepare_tx(sdata->local, sdata);
2089         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2090                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2091                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2092         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2093                             elems.challenge - 2, elems.challenge_len + 2,
2094                             auth_data->bss->bssid, auth_data->bss->bssid,
2095                             auth_data->key, auth_data->key_len,
2096                             auth_data->key_idx, tx_flags);
2097 }
2098
2099 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2100                                    struct ieee80211_mgmt *mgmt, size_t len)
2101 {
2102         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2103         u8 bssid[ETH_ALEN];
2104         u16 auth_alg, auth_transaction, status_code;
2105         struct sta_info *sta;
2106
2107         sdata_assert_lock(sdata);
2108
2109         if (len < 24 + 6)
2110                 return;
2111
2112         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2113                 return;
2114
2115         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2116
2117         if (!ether_addr_equal(bssid, mgmt->bssid))
2118                 return;
2119
2120         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2121         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2122         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2123
2124         if (auth_alg != ifmgd->auth_data->algorithm ||
2125             auth_transaction != ifmgd->auth_data->expected_transaction) {
2126                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2127                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2128                            auth_transaction,
2129                            ifmgd->auth_data->expected_transaction);
2130                 return;
2131         }
2132
2133         if (status_code != WLAN_STATUS_SUCCESS) {
2134                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2135                            mgmt->sa, status_code);
2136                 ieee80211_destroy_auth_data(sdata, false);
2137                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2138                 return;
2139         }
2140
2141         switch (ifmgd->auth_data->algorithm) {
2142         case WLAN_AUTH_OPEN:
2143         case WLAN_AUTH_LEAP:
2144         case WLAN_AUTH_FT:
2145         case WLAN_AUTH_SAE:
2146                 break;
2147         case WLAN_AUTH_SHARED_KEY:
2148                 if (ifmgd->auth_data->expected_transaction != 4) {
2149                         ieee80211_auth_challenge(sdata, mgmt, len);
2150                         /* need another frame */
2151                         return;
2152                 }
2153                 break;
2154         default:
2155                 WARN_ONCE(1, "invalid auth alg %d",
2156                           ifmgd->auth_data->algorithm);
2157                 return;
2158         }
2159
2160         sdata_info(sdata, "authenticated\n");
2161         ifmgd->auth_data->done = true;
2162         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2163         ifmgd->auth_data->timeout_started = true;
2164         run_again(sdata, ifmgd->auth_data->timeout);
2165
2166         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2167             ifmgd->auth_data->expected_transaction != 2) {
2168                 /*
2169                  * Report auth frame to user space for processing since another
2170                  * round of Authentication frames is still needed.
2171                  */
2172                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2173                 return;
2174         }
2175
2176         /* move station state to auth */
2177         mutex_lock(&sdata->local->sta_mtx);
2178         sta = sta_info_get(sdata, bssid);
2179         if (!sta) {
2180                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2181                 goto out_err;
2182         }
2183         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2184                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2185                 goto out_err;
2186         }
2187         mutex_unlock(&sdata->local->sta_mtx);
2188
2189         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2190         return;
2191  out_err:
2192         mutex_unlock(&sdata->local->sta_mtx);
2193         /* ignore frame -- wait for timeout */
2194 }
2195
2196
2197 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2198                                      struct ieee80211_mgmt *mgmt, size_t len)
2199 {
2200         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2201         const u8 *bssid = NULL;
2202         u16 reason_code;
2203
2204         sdata_assert_lock(sdata);
2205
2206         if (len < 24 + 2)
2207                 return;
2208
2209         if (!ifmgd->associated ||
2210             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2211                 return;
2212
2213         bssid = ifmgd->associated->bssid;
2214
2215         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2216
2217         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2218                    bssid, reason_code);
2219
2220         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2221
2222         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2223 }
2224
2225
2226 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2227                                        struct ieee80211_mgmt *mgmt, size_t len)
2228 {
2229         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2230         u16 reason_code;
2231
2232         sdata_assert_lock(sdata);
2233
2234         if (len < 24 + 2)
2235                 return;
2236
2237         if (!ifmgd->associated ||
2238             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2239                 return;
2240
2241         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2242
2243         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2244                    mgmt->sa, reason_code);
2245
2246         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2247
2248         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2249 }
2250
2251 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2252                                 u8 *supp_rates, unsigned int supp_rates_len,
2253                                 u32 *rates, u32 *basic_rates,
2254                                 bool *have_higher_than_11mbit,
2255                                 int *min_rate, int *min_rate_index,
2256                                 int shift, u32 rate_flags)
2257 {
2258         int i, j;
2259
2260         for (i = 0; i < supp_rates_len; i++) {
2261                 int rate = supp_rates[i] & 0x7f;
2262                 bool is_basic = !!(supp_rates[i] & 0x80);
2263
2264                 if ((rate * 5 * (1 << shift)) > 110)
2265                         *have_higher_than_11mbit = true;
2266
2267                 /*
2268                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2269                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2270                  *
2271                  * Note: Even through the membership selector and the basic
2272                  *       rate flag share the same bit, they are not exactly
2273                  *       the same.
2274                  */
2275                 if (!!(supp_rates[i] & 0x80) &&
2276                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2277                         continue;
2278
2279                 for (j = 0; j < sband->n_bitrates; j++) {
2280                         struct ieee80211_rate *br;
2281                         int brate;
2282
2283                         br = &sband->bitrates[j];
2284                         if ((rate_flags & br->flags) != rate_flags)
2285                                 continue;
2286
2287                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2288                         if (brate == rate) {
2289                                 *rates |= BIT(j);
2290                                 if (is_basic)
2291                                         *basic_rates |= BIT(j);
2292                                 if ((rate * 5) < *min_rate) {
2293                                         *min_rate = rate * 5;
2294                                         *min_rate_index = j;
2295                                 }
2296                                 break;
2297                         }
2298                 }
2299         }
2300 }
2301
2302 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2303                                          bool assoc)
2304 {
2305         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2306
2307         sdata_assert_lock(sdata);
2308
2309         if (!assoc) {
2310                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2311
2312                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2313                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2314                 sdata->u.mgd.flags = 0;
2315                 ieee80211_vif_release_channel(sdata);
2316         }
2317
2318         kfree(assoc_data);
2319         sdata->u.mgd.assoc_data = NULL;
2320 }
2321
2322 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2323                                     struct cfg80211_bss *cbss,
2324                                     struct ieee80211_mgmt *mgmt, size_t len)
2325 {
2326         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2327         struct ieee80211_local *local = sdata->local;
2328         struct ieee80211_supported_band *sband;
2329         struct sta_info *sta;
2330         u8 *pos;
2331         u16 capab_info, aid;
2332         struct ieee802_11_elems elems;
2333         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2334         const struct cfg80211_bss_ies *bss_ies = NULL;
2335         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2336         u32 changed = 0;
2337         int err;
2338         bool ret;
2339
2340         /* AssocResp and ReassocResp have identical structure */
2341
2342         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2343         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2344
2345         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2346                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2347                            aid);
2348         aid &= ~(BIT(15) | BIT(14));
2349
2350         ifmgd->broken_ap = false;
2351
2352         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2353                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2354                            aid);
2355                 aid = 0;
2356                 ifmgd->broken_ap = true;
2357         }
2358
2359         pos = mgmt->u.assoc_resp.variable;
2360         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2361
2362         if (!elems.supp_rates) {
2363                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2364                 return false;
2365         }
2366
2367         ifmgd->aid = aid;
2368
2369         /*
2370          * Some APs are erroneously not including some information in their
2371          * (re)association response frames. Try to recover by using the data
2372          * from the beacon or probe response. This seems to afflict mobile
2373          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2374          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2375          */
2376         if ((assoc_data->wmm && !elems.wmm_param) ||
2377             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2378              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2379             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2380              (!elems.vht_cap_elem || !elems.vht_operation))) {
2381                 const struct cfg80211_bss_ies *ies;
2382                 struct ieee802_11_elems bss_elems;
2383
2384                 rcu_read_lock();
2385                 ies = rcu_dereference(cbss->ies);
2386                 if (ies)
2387                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2388                                           GFP_ATOMIC);
2389                 rcu_read_unlock();
2390                 if (!bss_ies)
2391                         return false;
2392
2393                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2394                                        false, &bss_elems);
2395                 if (assoc_data->wmm &&
2396                     !elems.wmm_param && bss_elems.wmm_param) {
2397                         elems.wmm_param = bss_elems.wmm_param;
2398                         sdata_info(sdata,
2399                                    "AP bug: WMM param missing from AssocResp\n");
2400                 }
2401
2402                 /*
2403                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2404                  * have to include the IEs in the (re)association response.
2405                  */
2406                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2407                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2408                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2409                         sdata_info(sdata,
2410                                    "AP bug: HT capability missing from AssocResp\n");
2411                 }
2412                 if (!elems.ht_operation && bss_elems.ht_operation &&
2413                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2414                         elems.ht_operation = bss_elems.ht_operation;
2415                         sdata_info(sdata,
2416                                    "AP bug: HT operation missing from AssocResp\n");
2417                 }
2418                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2419                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2420                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2421                         sdata_info(sdata,
2422                                    "AP bug: VHT capa missing from AssocResp\n");
2423                 }
2424                 if (!elems.vht_operation && bss_elems.vht_operation &&
2425                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2426                         elems.vht_operation = bss_elems.vht_operation;
2427                         sdata_info(sdata,
2428                                    "AP bug: VHT operation missing from AssocResp\n");
2429                 }
2430         }
2431
2432         /*
2433          * We previously checked these in the beacon/probe response, so
2434          * they should be present here. This is just a safety net.
2435          */
2436         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2437             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2438                 sdata_info(sdata,
2439                            "HT AP is missing WMM params or HT capability/operation\n");
2440                 ret = false;
2441                 goto out;
2442         }
2443
2444         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2445             (!elems.vht_cap_elem || !elems.vht_operation)) {
2446                 sdata_info(sdata,
2447                            "VHT AP is missing VHT capability/operation\n");
2448                 ret = false;
2449                 goto out;
2450         }
2451
2452         mutex_lock(&sdata->local->sta_mtx);
2453         /*
2454          * station info was already allocated and inserted before
2455          * the association and should be available to us
2456          */
2457         sta = sta_info_get(sdata, cbss->bssid);
2458         if (WARN_ON(!sta)) {
2459                 mutex_unlock(&sdata->local->sta_mtx);
2460                 ret = false;
2461                 goto out;
2462         }
2463
2464         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2465
2466         /* Set up internal HT/VHT capabilities */
2467         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2468                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2469                                                   elems.ht_cap_elem, sta);
2470
2471         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2472                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2473                                                     elems.vht_cap_elem, sta);
2474
2475         /*
2476          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2477          * in their association response, so ignore that data for our own
2478          * configuration. If it changed since the last beacon, we'll get the
2479          * next beacon and update then.
2480          */
2481
2482         /*
2483          * If an operating mode notification IE is present, override the
2484          * NSS calculation (that would be done in rate_control_rate_init())
2485          * and use the # of streams from that element.
2486          */
2487         if (elems.opmode_notif &&
2488             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2489                 u8 nss;
2490
2491                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2492                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2493                 nss += 1;
2494                 sta->sta.rx_nss = nss;
2495         }
2496
2497         rate_control_rate_init(sta);
2498
2499         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2500                 set_sta_flag(sta, WLAN_STA_MFP);
2501
2502         if (elems.wmm_param)
2503                 set_sta_flag(sta, WLAN_STA_WME);
2504
2505         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2506         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2507                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2508         if (err) {
2509                 sdata_info(sdata,
2510                            "failed to move station %pM to desired state\n",
2511                            sta->sta.addr);
2512                 WARN_ON(__sta_info_destroy(sta));
2513                 mutex_unlock(&sdata->local->sta_mtx);
2514                 ret = false;
2515                 goto out;
2516         }
2517
2518         mutex_unlock(&sdata->local->sta_mtx);
2519
2520         /*
2521          * Always handle WMM once after association regardless
2522          * of the first value the AP uses. Setting -1 here has
2523          * that effect because the AP values is an unsigned
2524          * 4-bit value.
2525          */
2526         ifmgd->wmm_last_param_set = -1;
2527
2528         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2529                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2530                                          elems.wmm_param_len);
2531         else
2532                 ieee80211_set_wmm_default(sdata, false);
2533         changed |= BSS_CHANGED_QOS;
2534
2535         /* set AID and assoc capability,
2536          * ieee80211_set_associated() will tell the driver */
2537         bss_conf->aid = aid;
2538         bss_conf->assoc_capability = capab_info;
2539         ieee80211_set_associated(sdata, cbss, changed);
2540
2541         /*
2542          * If we're using 4-addr mode, let the AP know that we're
2543          * doing so, so that it can create the STA VLAN on its side
2544          */
2545         if (ifmgd->use_4addr)
2546                 ieee80211_send_4addr_nullfunc(local, sdata);
2547
2548         /*
2549          * Start timer to probe the connection to the AP now.
2550          * Also start the timer that will detect beacon loss.
2551          */
2552         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2553         ieee80211_sta_reset_beacon_monitor(sdata);
2554
2555         ret = true;
2556  out:
2557         kfree(bss_ies);
2558         return ret;
2559 }
2560
2561 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2562                                          struct ieee80211_mgmt *mgmt,
2563                                          size_t len)
2564 {
2565         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2566         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2567         u16 capab_info, status_code, aid;
2568         struct ieee802_11_elems elems;
2569         u8 *pos;
2570         bool reassoc;
2571         struct cfg80211_bss *bss;
2572
2573         sdata_assert_lock(sdata);
2574
2575         if (!assoc_data)
2576                 return;
2577         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2578                 return;
2579
2580         /*
2581          * AssocResp and ReassocResp have identical structure, so process both
2582          * of them in this function.
2583          */
2584
2585         if (len < 24 + 6)
2586                 return;
2587
2588         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2589         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2590         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2591         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2592
2593         sdata_info(sdata,
2594                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2595                    reassoc ? "Rea" : "A", mgmt->sa,
2596                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2597
2598         pos = mgmt->u.assoc_resp.variable;
2599         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2600
2601         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2602             elems.timeout_int &&
2603             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2604                 u32 tu, ms;
2605                 tu = le32_to_cpu(elems.timeout_int->value);
2606                 ms = tu * 1024 / 1000;
2607                 sdata_info(sdata,
2608                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2609                            mgmt->sa, tu, ms);
2610                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2611                 assoc_data->timeout_started = true;
2612                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2613                         run_again(sdata, assoc_data->timeout);
2614                 return;
2615         }
2616
2617         bss = assoc_data->bss;
2618
2619         if (status_code != WLAN_STATUS_SUCCESS) {
2620                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2621                            mgmt->sa, status_code);
2622                 ieee80211_destroy_assoc_data(sdata, false);
2623         } else {
2624                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2625                         /* oops -- internal error -- send timeout for now */
2626                         ieee80211_destroy_assoc_data(sdata, false);
2627                         cfg80211_assoc_timeout(sdata->dev, bss);
2628                         return;
2629                 }
2630                 sdata_info(sdata, "associated\n");
2631
2632                 /*
2633                  * destroy assoc_data afterwards, as otherwise an idle
2634                  * recalc after assoc_data is NULL but before associated
2635                  * is set can cause the interface to go idle
2636                  */
2637                 ieee80211_destroy_assoc_data(sdata, true);
2638         }
2639
2640         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
2641 }
2642
2643 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2644                                   struct ieee80211_mgmt *mgmt, size_t len,
2645                                   struct ieee80211_rx_status *rx_status,
2646                                   struct ieee802_11_elems *elems)
2647 {
2648         struct ieee80211_local *local = sdata->local;
2649         int freq;
2650         struct ieee80211_bss *bss;
2651         struct ieee80211_channel *channel;
2652
2653         sdata_assert_lock(sdata);
2654
2655         if (elems->ds_params)
2656                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2657                                                       rx_status->band);
2658         else
2659                 freq = rx_status->freq;
2660
2661         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2662
2663         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2664                 return;
2665
2666         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2667                                         channel);
2668         if (bss) {
2669                 ieee80211_rx_bss_put(local, bss);
2670                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2671         }
2672 }
2673
2674
2675 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2676                                          struct sk_buff *skb)
2677 {
2678         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2679         struct ieee80211_if_managed *ifmgd;
2680         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2681         size_t baselen, len = skb->len;
2682         struct ieee802_11_elems elems;
2683
2684         ifmgd = &sdata->u.mgd;
2685
2686         sdata_assert_lock(sdata);
2687
2688         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2689                 return; /* ignore ProbeResp to foreign address */
2690
2691         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2692         if (baselen > len)
2693                 return;
2694
2695         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2696                                false, &elems);
2697
2698         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2699
2700         if (ifmgd->associated &&
2701             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2702                 ieee80211_reset_ap_probe(sdata);
2703
2704         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2705             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2706                 /* got probe response, continue with auth */
2707                 sdata_info(sdata, "direct probe responded\n");
2708                 ifmgd->auth_data->tries = 0;
2709                 ifmgd->auth_data->timeout = jiffies;
2710                 ifmgd->auth_data->timeout_started = true;
2711                 run_again(sdata, ifmgd->auth_data->timeout);
2712         }
2713 }
2714
2715 /*
2716  * This is the canonical list of information elements we care about,
2717  * the filter code also gives us all changes to the Microsoft OUI
2718  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2719  *
2720  * We implement beacon filtering in software since that means we can
2721  * avoid processing the frame here and in cfg80211, and userspace
2722  * will not be able to tell whether the hardware supports it or not.
2723  *
2724  * XXX: This list needs to be dynamic -- userspace needs to be able to
2725  *      add items it requires. It also needs to be able to tell us to
2726  *      look out for other vendor IEs.
2727  */
2728 static const u64 care_about_ies =
2729         (1ULL << WLAN_EID_COUNTRY) |
2730         (1ULL << WLAN_EID_ERP_INFO) |
2731         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2732         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2733         (1ULL << WLAN_EID_HT_CAPABILITY) |
2734         (1ULL << WLAN_EID_HT_OPERATION);
2735
2736 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2737                                      struct ieee80211_mgmt *mgmt, size_t len,
2738                                      struct ieee80211_rx_status *rx_status)
2739 {
2740         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2741         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2742         size_t baselen;
2743         struct ieee802_11_elems elems;
2744         struct ieee80211_local *local = sdata->local;
2745         struct ieee80211_chanctx_conf *chanctx_conf;
2746         struct ieee80211_channel *chan;
2747         struct sta_info *sta;
2748         u32 changed = 0;
2749         bool erp_valid;
2750         u8 erp_value = 0;
2751         u32 ncrc;
2752         u8 *bssid;
2753         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2754
2755         sdata_assert_lock(sdata);
2756
2757         /* Process beacon from the current BSS */
2758         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2759         if (baselen > len)
2760                 return;
2761
2762         rcu_read_lock();
2763         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2764         if (!chanctx_conf) {
2765                 rcu_read_unlock();
2766                 return;
2767         }
2768
2769         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2770                 rcu_read_unlock();
2771                 return;
2772         }
2773         chan = chanctx_conf->def.chan;
2774         rcu_read_unlock();
2775
2776         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2777             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2778                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2779                                        len - baselen, false, &elems);
2780
2781                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2782                 if (elems.tim && !elems.parse_error) {
2783                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
2784                         ifmgd->dtim_period = tim_ie->dtim_period;
2785                 }
2786                 ifmgd->have_beacon = true;
2787                 ifmgd->assoc_data->need_beacon = false;
2788                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2789                         sdata->vif.bss_conf.sync_tsf =
2790                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2791                         sdata->vif.bss_conf.sync_device_ts =
2792                                 rx_status->device_timestamp;
2793                         if (elems.tim)
2794                                 sdata->vif.bss_conf.sync_dtim_count =
2795                                         elems.tim->dtim_count;
2796                         else
2797                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2798                 }
2799                 /* continue assoc process */
2800                 ifmgd->assoc_data->timeout = jiffies;
2801                 ifmgd->assoc_data->timeout_started = true;
2802                 run_again(sdata, ifmgd->assoc_data->timeout);
2803                 return;
2804         }
2805
2806         if (!ifmgd->associated ||
2807             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2808                 return;
2809         bssid = ifmgd->associated->bssid;
2810
2811         /* Track average RSSI from the Beacon frames of the current AP */
2812         ifmgd->last_beacon_signal = rx_status->signal;
2813         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2814                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2815                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2816                 ifmgd->last_cqm_event_signal = 0;
2817                 ifmgd->count_beacon_signal = 1;
2818                 ifmgd->last_ave_beacon_signal = 0;
2819         } else {
2820                 ifmgd->ave_beacon_signal =
2821                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2822                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2823                          ifmgd->ave_beacon_signal) / 16;
2824                 ifmgd->count_beacon_signal++;
2825         }
2826
2827         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2828             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2829                 int sig = ifmgd->ave_beacon_signal;
2830                 int last_sig = ifmgd->last_ave_beacon_signal;
2831
2832                 /*
2833                  * if signal crosses either of the boundaries, invoke callback
2834                  * with appropriate parameters
2835                  */
2836                 if (sig > ifmgd->rssi_max_thold &&
2837                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2838                         ifmgd->last_ave_beacon_signal = sig;
2839                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2840                 } else if (sig < ifmgd->rssi_min_thold &&
2841                            (last_sig >= ifmgd->rssi_max_thold ||
2842                            last_sig == 0)) {
2843                         ifmgd->last_ave_beacon_signal = sig;
2844                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2845                 }
2846         }
2847
2848         if (bss_conf->cqm_rssi_thold &&
2849             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2850             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2851                 int sig = ifmgd->ave_beacon_signal / 16;
2852                 int last_event = ifmgd->last_cqm_event_signal;
2853                 int thold = bss_conf->cqm_rssi_thold;
2854                 int hyst = bss_conf->cqm_rssi_hyst;
2855                 if (sig < thold &&
2856                     (last_event == 0 || sig < last_event - hyst)) {
2857                         ifmgd->last_cqm_event_signal = sig;
2858                         ieee80211_cqm_rssi_notify(
2859                                 &sdata->vif,
2860                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2861                                 GFP_KERNEL);
2862                 } else if (sig > thold &&
2863                            (last_event == 0 || sig > last_event + hyst)) {
2864                         ifmgd->last_cqm_event_signal = sig;
2865                         ieee80211_cqm_rssi_notify(
2866                                 &sdata->vif,
2867                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2868                                 GFP_KERNEL);
2869                 }
2870         }
2871
2872         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
2873                 mlme_dbg_ratelimited(sdata,
2874                                      "cancelling AP probe due to a received beacon\n");
2875                 ieee80211_reset_ap_probe(sdata);
2876         }
2877
2878         /*
2879          * Push the beacon loss detection into the future since
2880          * we are processing a beacon from the AP just now.
2881          */
2882         ieee80211_sta_reset_beacon_monitor(sdata);
2883
2884         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2885         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2886                                           len - baselen, false, &elems,
2887                                           care_about_ies, ncrc);
2888
2889         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2890                 bool directed_tim = ieee80211_check_tim(elems.tim,
2891                                                         elems.tim_len,
2892                                                         ifmgd->aid);
2893                 if (directed_tim) {
2894                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2895                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2896                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2897                                         ieee80211_hw_config(local,
2898                                                             IEEE80211_CONF_CHANGE_PS);
2899                                 }
2900                                 ieee80211_send_nullfunc(local, sdata, 0);
2901                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2902                                 local->pspolling = true;
2903
2904                                 /*
2905                                  * Here is assumed that the driver will be
2906                                  * able to send ps-poll frame and receive a
2907                                  * response even though power save mode is
2908                                  * enabled, but some drivers might require
2909                                  * to disable power save here. This needs
2910                                  * to be investigated.
2911                                  */
2912                                 ieee80211_send_pspoll(local, sdata);
2913                         }
2914                 }
2915         }
2916
2917         if (sdata->vif.p2p) {
2918                 struct ieee80211_p2p_noa_attr noa = {};
2919                 int ret;
2920
2921                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
2922                                             len - baselen,
2923                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2924                                             (u8 *) &noa, sizeof(noa));
2925                 if (ret >= 2) {
2926                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
2927                                 /* valid noa_attr and index changed */
2928                                 sdata->u.mgd.p2p_noa_index = noa.index;
2929                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
2930                                 changed |= BSS_CHANGED_P2P_PS;
2931                                 /*
2932                                  * make sure we update all information, the CRC
2933                                  * mechanism doesn't look at P2P attributes.
2934                                  */
2935                                 ifmgd->beacon_crc_valid = false;
2936                         }
2937                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
2938                         /* noa_attr not found and we had valid noa_attr before */
2939                         sdata->u.mgd.p2p_noa_index = -1;
2940                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
2941                         changed |= BSS_CHANGED_P2P_PS;
2942                         ifmgd->beacon_crc_valid = false;
2943                 }
2944         }
2945
2946         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2947                 return;
2948         ifmgd->beacon_crc = ncrc;
2949         ifmgd->beacon_crc_valid = true;
2950
2951         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2952
2953         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
2954                                          &elems, true);
2955
2956         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
2957             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2958                                      elems.wmm_param_len))
2959                 changed |= BSS_CHANGED_QOS;
2960
2961         /*
2962          * If we haven't had a beacon before, tell the driver about the
2963          * DTIM period (and beacon timing if desired) now.
2964          */
2965         if (!ifmgd->have_beacon) {
2966                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
2967                 if (elems.tim)
2968                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
2969                 else
2970                         bss_conf->dtim_period = 1;
2971
2972                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2973                         sdata->vif.bss_conf.sync_tsf =
2974                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2975                         sdata->vif.bss_conf.sync_device_ts =
2976                                 rx_status->device_timestamp;
2977                         if (elems.tim)
2978                                 sdata->vif.bss_conf.sync_dtim_count =
2979                                         elems.tim->dtim_count;
2980                         else
2981                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2982                 }
2983
2984                 changed |= BSS_CHANGED_BEACON_INFO;
2985                 ifmgd->have_beacon = true;
2986
2987                 mutex_lock(&local->iflist_mtx);
2988                 ieee80211_recalc_ps(local, -1);
2989                 mutex_unlock(&local->iflist_mtx);
2990
2991                 ieee80211_recalc_ps_vif(sdata);
2992         }
2993
2994         if (elems.erp_info) {
2995                 erp_valid = true;
2996                 erp_value = elems.erp_info[0];
2997         } else {
2998                 erp_valid = false;
2999         }
3000         changed |= ieee80211_handle_bss_capability(sdata,
3001                         le16_to_cpu(mgmt->u.beacon.capab_info),
3002                         erp_valid, erp_value);
3003
3004         mutex_lock(&local->sta_mtx);
3005         sta = sta_info_get(sdata, bssid);
3006
3007         if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3008                                 elems.vht_operation, bssid, &changed)) {
3009                 mutex_unlock(&local->sta_mtx);
3010                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3011                                        WLAN_REASON_DEAUTH_LEAVING,
3012                                        true, deauth_buf);
3013                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3014                                       sizeof(deauth_buf));
3015                 return;
3016         }
3017
3018         if (sta && elems.opmode_notif)
3019                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3020                                             rx_status->band, true);
3021         mutex_unlock(&local->sta_mtx);
3022
3023         if (elems.country_elem && elems.pwr_constr_elem &&
3024             mgmt->u.probe_resp.capab_info &
3025                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3026                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3027                                                        elems.country_elem,
3028                                                        elems.country_elem_len,
3029                                                        elems.pwr_constr_elem);
3030
3031         ieee80211_bss_info_change_notify(sdata, changed);
3032 }
3033
3034 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3035                                   struct sk_buff *skb)
3036 {
3037         struct ieee80211_rx_status *rx_status;
3038         struct ieee80211_mgmt *mgmt;
3039         u16 fc;
3040         struct ieee802_11_elems elems;
3041         int ies_len;
3042
3043         rx_status = (struct ieee80211_rx_status *) skb->cb;
3044         mgmt = (struct ieee80211_mgmt *) skb->data;
3045         fc = le16_to_cpu(mgmt->frame_control);
3046
3047         sdata_lock(sdata);
3048
3049         switch (fc & IEEE80211_FCTL_STYPE) {
3050         case IEEE80211_STYPE_BEACON:
3051                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3052                 break;
3053         case IEEE80211_STYPE_PROBE_RESP:
3054                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3055                 break;
3056         case IEEE80211_STYPE_AUTH:
3057                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3058                 break;
3059         case IEEE80211_STYPE_DEAUTH:
3060                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3061                 break;
3062         case IEEE80211_STYPE_DISASSOC:
3063                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3064                 break;
3065         case IEEE80211_STYPE_ASSOC_RESP:
3066         case IEEE80211_STYPE_REASSOC_RESP:
3067                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3068                 break;
3069         case IEEE80211_STYPE_ACTION:
3070                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3071                         ies_len = skb->len -
3072                                   offsetof(struct ieee80211_mgmt,
3073                                            u.action.u.chan_switch.variable);
3074
3075                         if (ies_len < 0)
3076                                 break;
3077
3078                         ieee802_11_parse_elems(
3079                                 mgmt->u.action.u.chan_switch.variable,
3080                                 ies_len, true, &elems);
3081
3082                         if (elems.parse_error)
3083                                 break;
3084
3085                         ieee80211_sta_process_chanswitch(sdata,
3086                                                          rx_status->mactime,
3087                                                          &elems, false);
3088                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3089                         ies_len = skb->len -
3090                                   offsetof(struct ieee80211_mgmt,
3091                                            u.action.u.ext_chan_switch.variable);
3092
3093                         if (ies_len < 0)
3094                                 break;
3095
3096                         ieee802_11_parse_elems(
3097                                 mgmt->u.action.u.ext_chan_switch.variable,
3098                                 ies_len, true, &elems);
3099
3100                         if (elems.parse_error)
3101                                 break;
3102
3103                         /* for the handling code pretend this was also an IE */
3104                         elems.ext_chansw_ie =
3105                                 &mgmt->u.action.u.ext_chan_switch.data;
3106
3107                         ieee80211_sta_process_chanswitch(sdata,
3108                                                          rx_status->mactime,
3109                                                          &elems, false);
3110                 }
3111                 break;
3112         }
3113         sdata_unlock(sdata);
3114 }
3115
3116 static void ieee80211_sta_timer(unsigned long data)
3117 {
3118         struct ieee80211_sub_if_data *sdata =
3119                 (struct ieee80211_sub_if_data *) data;
3120
3121         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3122 }
3123
3124 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3125                                           u8 *bssid, u8 reason, bool tx)
3126 {
3127         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3128
3129         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3130                                tx, frame_buf);
3131
3132         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3133                               IEEE80211_DEAUTH_FRAME_LEN);
3134 }
3135
3136 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3137 {
3138         struct ieee80211_local *local = sdata->local;
3139         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3140         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3141         u32 tx_flags = 0;
3142
3143         sdata_assert_lock(sdata);
3144
3145         if (WARN_ON_ONCE(!auth_data))
3146                 return -EINVAL;
3147
3148         auth_data->tries++;
3149
3150         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3151                 sdata_info(sdata, "authentication with %pM timed out\n",
3152                            auth_data->bss->bssid);
3153
3154                 /*
3155                  * Most likely AP is not in the range so remove the
3156                  * bss struct for that AP.
3157                  */
3158                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3159
3160                 return -ETIMEDOUT;
3161         }
3162
3163         drv_mgd_prepare_tx(local, sdata);
3164
3165         if (auth_data->bss->proberesp_ies) {
3166                 u16 trans = 1;
3167                 u16 status = 0;
3168
3169                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3170                            auth_data->bss->bssid, auth_data->tries,
3171                            IEEE80211_AUTH_MAX_TRIES);
3172
3173                 auth_data->expected_transaction = 2;
3174
3175                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3176                         trans = auth_data->sae_trans;
3177                         status = auth_data->sae_status;
3178                         auth_data->expected_transaction = trans;
3179                 }
3180
3181                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3182                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3183                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3184
3185                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3186                                     auth_data->data, auth_data->data_len,
3187                                     auth_data->bss->bssid,
3188                                     auth_data->bss->bssid, NULL, 0, 0,
3189                                     tx_flags);
3190         } else {
3191                 const u8 *ssidie;
3192
3193                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3194                            auth_data->bss->bssid, auth_data->tries,
3195                            IEEE80211_AUTH_MAX_TRIES);
3196
3197                 rcu_read_lock();
3198                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3199                 if (!ssidie) {
3200                         rcu_read_unlock();
3201                         return -EINVAL;
3202                 }
3203                 /*
3204                  * Direct probe is sent to broadcast address as some APs
3205                  * will not answer to direct packet in unassociated state.
3206                  */
3207                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3208                                          NULL, 0, (u32) -1, true, 0,
3209                                          auth_data->bss->channel, false);
3210                 rcu_read_unlock();
3211         }
3212
3213         if (tx_flags == 0) {
3214                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3215                 auth_data->timeout_started = true;
3216                 run_again(sdata, auth_data->timeout);
3217         } else {
3218                 auth_data->timeout =
3219                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3220                 auth_data->timeout_started = true;
3221                 run_again(sdata, auth_data->timeout);
3222         }
3223
3224         return 0;
3225 }
3226
3227 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3228 {
3229         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3230         struct ieee80211_local *local = sdata->local;
3231
3232         sdata_assert_lock(sdata);
3233
3234         assoc_data->tries++;
3235         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3236                 sdata_info(sdata, "association with %pM timed out\n",
3237                            assoc_data->bss->bssid);
3238
3239                 /*
3240                  * Most likely AP is not in the range so remove the
3241                  * bss struct for that AP.
3242                  */
3243                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3244
3245                 return -ETIMEDOUT;
3246         }
3247
3248         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3249                    assoc_data->bss->bssid, assoc_data->tries,
3250                    IEEE80211_ASSOC_MAX_TRIES);
3251         ieee80211_send_assoc(sdata);
3252
3253         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3254                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3255                 assoc_data->timeout_started = true;
3256                 run_again(sdata, assoc_data->timeout);
3257         } else {
3258                 assoc_data->timeout =
3259                         round_jiffies_up(jiffies +
3260                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3261                 assoc_data->timeout_started = true;
3262                 run_again(sdata, assoc_data->timeout);
3263         }
3264
3265         return 0;
3266 }
3267
3268 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3269                                   __le16 fc, bool acked)
3270 {
3271         struct ieee80211_local *local = sdata->local;
3272
3273         sdata->u.mgd.status_fc = fc;
3274         sdata->u.mgd.status_acked = acked;
3275         sdata->u.mgd.status_received = true;
3276
3277         ieee80211_queue_work(&local->hw, &sdata->work);
3278 }
3279
3280 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3281 {
3282         struct ieee80211_local *local = sdata->local;
3283         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3284
3285         sdata_lock(sdata);
3286
3287         if (ifmgd->status_received) {
3288                 __le16 fc = ifmgd->status_fc;
3289                 bool status_acked = ifmgd->status_acked;
3290
3291                 ifmgd->status_received = false;
3292                 if (ifmgd->auth_data &&
3293                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3294                         if (status_acked) {
3295                                 ifmgd->auth_data->timeout =
3296                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3297                                 run_again(sdata, ifmgd->auth_data->timeout);
3298                         } else {
3299                                 ifmgd->auth_data->timeout = jiffies - 1;
3300                         }
3301                         ifmgd->auth_data->timeout_started = true;
3302                 } else if (ifmgd->assoc_data &&
3303                            (ieee80211_is_assoc_req(fc) ||
3304                             ieee80211_is_reassoc_req(fc))) {
3305                         if (status_acked) {
3306                                 ifmgd->assoc_data->timeout =
3307                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3308                                 run_again(sdata, ifmgd->assoc_data->timeout);
3309                         } else {
3310                                 ifmgd->assoc_data->timeout = jiffies - 1;
3311                         }
3312                         ifmgd->assoc_data->timeout_started = true;
3313                 }
3314         }
3315
3316         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3317             time_after(jiffies, ifmgd->auth_data->timeout)) {
3318                 if (ifmgd->auth_data->done) {
3319                         /*
3320                          * ok ... we waited for assoc but userspace didn't,
3321                          * so let's just kill the auth data
3322                          */
3323                         ieee80211_destroy_auth_data(sdata, false);
3324                 } else if (ieee80211_probe_auth(sdata)) {
3325                         u8 bssid[ETH_ALEN];
3326
3327                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3328
3329                         ieee80211_destroy_auth_data(sdata, false);
3330
3331                         cfg80211_auth_timeout(sdata->dev, bssid);
3332                 }
3333         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3334                 run_again(sdata, ifmgd->auth_data->timeout);
3335
3336         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3337             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3338                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3339                     ieee80211_do_assoc(sdata)) {
3340                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3341
3342                         ieee80211_destroy_assoc_data(sdata, false);
3343                         cfg80211_assoc_timeout(sdata->dev, bss);
3344                 }
3345         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3346                 run_again(sdata, ifmgd->assoc_data->timeout);
3347
3348         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3349             ifmgd->associated) {
3350                 u8 bssid[ETH_ALEN];
3351                 int max_tries;
3352
3353                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3354
3355                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3356                         max_tries = max_nullfunc_tries;
3357                 else
3358                         max_tries = max_probe_tries;
3359
3360                 /* ACK received for nullfunc probing frame */
3361                 if (!ifmgd->probe_send_count)
3362                         ieee80211_reset_ap_probe(sdata);
3363                 else if (ifmgd->nullfunc_failed) {
3364                         if (ifmgd->probe_send_count < max_tries) {
3365                                 mlme_dbg(sdata,
3366                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3367                                          bssid, ifmgd->probe_send_count,
3368                                          max_tries);
3369                                 ieee80211_mgd_probe_ap_send(sdata);
3370                         } else {
3371                                 mlme_dbg(sdata,
3372                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3373                                          bssid);
3374                                 ieee80211_sta_connection_lost(sdata, bssid,
3375                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3376                                         false);
3377                         }
3378                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3379                         run_again(sdata, ifmgd->probe_timeout);
3380                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3381                         mlme_dbg(sdata,
3382                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3383                                  bssid, probe_wait_ms);
3384                         ieee80211_sta_connection_lost(sdata, bssid,
3385                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3386                 } else if (ifmgd->probe_send_count < max_tries) {
3387                         mlme_dbg(sdata,
3388                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3389                                  bssid, probe_wait_ms,
3390                                  ifmgd->probe_send_count, max_tries);
3391                         ieee80211_mgd_probe_ap_send(sdata);
3392                 } else {
3393                         /*
3394                          * We actually lost the connection ... or did we?
3395                          * Let's make sure!
3396                          */
3397                         wiphy_debug(local->hw.wiphy,
3398                                     "%s: No probe response from AP %pM"
3399                                     " after %dms, disconnecting.\n",
3400                                     sdata->name,
3401                                     bssid, probe_wait_ms);
3402
3403                         ieee80211_sta_connection_lost(sdata, bssid,
3404                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3405                 }
3406         }
3407
3408         sdata_unlock(sdata);
3409 }
3410
3411 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3412 {
3413         struct ieee80211_sub_if_data *sdata =
3414                 (struct ieee80211_sub_if_data *) data;
3415         struct ieee80211_local *local = sdata->local;
3416
3417         if (local->quiescing)
3418                 return;
3419
3420         sdata->u.mgd.connection_loss = false;
3421         ieee80211_queue_work(&sdata->local->hw,
3422                              &sdata->u.mgd.beacon_connection_loss_work);
3423 }
3424
3425 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3426 {
3427         struct ieee80211_sub_if_data *sdata =
3428                 (struct ieee80211_sub_if_data *) data;
3429         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3430         struct ieee80211_local *local = sdata->local;
3431
3432         if (local->quiescing)
3433                 return;
3434
3435         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3436 }
3437
3438 static void ieee80211_sta_monitor_work(struct work_struct *work)
3439 {
3440         struct ieee80211_sub_if_data *sdata =
3441                 container_of(work, struct ieee80211_sub_if_data,
3442                              u.mgd.monitor_work);
3443
3444         ieee80211_mgd_probe_ap(sdata, false);
3445 }
3446
3447 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3448 {
3449         u32 flags;
3450
3451         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3452                 __ieee80211_stop_poll(sdata);
3453
3454                 /* let's probe the connection once */
3455                 flags = sdata->local->hw.flags;
3456                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3457                         ieee80211_queue_work(&sdata->local->hw,
3458                                              &sdata->u.mgd.monitor_work);
3459                 /* and do all the other regular work too */
3460                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3461         }
3462 }
3463
3464 #ifdef CONFIG_PM
3465 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3466 {
3467         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3468
3469         sdata_lock(sdata);
3470         if (!ifmgd->associated) {
3471                 sdata_unlock(sdata);
3472                 return;
3473         }
3474
3475         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3476                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3477                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3478                 ieee80211_sta_connection_lost(sdata,
3479                                               ifmgd->associated->bssid,
3480                                               WLAN_REASON_UNSPECIFIED,
3481                                               true);
3482                 sdata_unlock(sdata);
3483                 return;
3484         }
3485         sdata_unlock(sdata);
3486 }
3487 #endif
3488
3489 /* interface setup */
3490 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3491 {
3492         struct ieee80211_if_managed *ifmgd;
3493
3494         ifmgd = &sdata->u.mgd;
3495         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3496         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3497         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3498                   ieee80211_beacon_connection_loss_work);
3499         INIT_WORK(&ifmgd->csa_connection_drop_work,
3500                   ieee80211_csa_connection_drop_work);
3501         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3502         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3503                     (unsigned long) sdata);
3504         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3505                     (unsigned long) sdata);
3506         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3507                     (unsigned long) sdata);
3508         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3509                     (unsigned long) sdata);
3510
3511         ifmgd->flags = 0;
3512         ifmgd->powersave = sdata->wdev.ps;
3513         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3514         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3515         ifmgd->p2p_noa_index = -1;
3516
3517         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3518                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3519         else
3520                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3521 }
3522
3523 /* scan finished notification */
3524 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3525 {
3526         struct ieee80211_sub_if_data *sdata;
3527
3528         /* Restart STA timers */
3529         rcu_read_lock();
3530         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3531                 if (ieee80211_sdata_running(sdata))
3532                         ieee80211_restart_sta_timer(sdata);
3533         }
3534         rcu_read_unlock();
3535 }
3536
3537 int ieee80211_max_network_latency(struct notifier_block *nb,
3538                                   unsigned long data, void *dummy)
3539 {
3540         s32 latency_usec = (s32) data;
3541         struct ieee80211_local *local =
3542                 container_of(nb, struct ieee80211_local,
3543                              network_latency_notifier);
3544
3545         mutex_lock(&local->iflist_mtx);
3546         ieee80211_recalc_ps(local, latency_usec);
3547         mutex_unlock(&local->iflist_mtx);
3548
3549         return 0;
3550 }
3551
3552 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3553                                      struct cfg80211_bss *cbss)
3554 {
3555         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3556         const u8 *ht_cap_ie, *vht_cap_ie;
3557         const struct ieee80211_ht_cap *ht_cap;
3558         const struct ieee80211_vht_cap *vht_cap;
3559         u8 chains = 1;
3560
3561         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3562                 return chains;
3563
3564         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3565         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3566                 ht_cap = (void *)(ht_cap_ie + 2);
3567                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3568                 /*
3569                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3570                  *       "Tx Unequal Modulation Supported" fields.
3571                  */
3572         }
3573
3574         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3575                 return chains;
3576
3577         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3578         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3579                 u8 nss;
3580                 u16 tx_mcs_map;
3581
3582                 vht_cap = (void *)(vht_cap_ie + 2);
3583                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3584                 for (nss = 8; nss > 0; nss--) {
3585                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3586                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3587                                 break;
3588                 }
3589                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3590                 chains = max(chains, nss);
3591         }
3592
3593         return chains;
3594 }
3595
3596 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3597                                   struct cfg80211_bss *cbss)
3598 {
3599         struct ieee80211_local *local = sdata->local;
3600         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3601         const struct ieee80211_ht_operation *ht_oper = NULL;
3602         const struct ieee80211_vht_operation *vht_oper = NULL;
3603         struct ieee80211_supported_band *sband;
3604         struct cfg80211_chan_def chandef;
3605         int ret;
3606
3607         sband = local->hw.wiphy->bands[cbss->channel->band];
3608
3609         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3610                           IEEE80211_STA_DISABLE_80P80MHZ |
3611                           IEEE80211_STA_DISABLE_160MHZ);
3612
3613         rcu_read_lock();
3614
3615         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3616             sband->ht_cap.ht_supported) {
3617                 const u8 *ht_oper_ie, *ht_cap;
3618
3619                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3620                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3621                         ht_oper = (void *)(ht_oper_ie + 2);
3622
3623                 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3624                 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3625                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3626                         ht_oper = NULL;
3627                 }
3628         }
3629
3630         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3631             sband->vht_cap.vht_supported) {
3632                 const u8 *vht_oper_ie, *vht_cap;
3633
3634                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3635                                                    WLAN_EID_VHT_OPERATION);
3636                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3637                         vht_oper = (void *)(vht_oper_ie + 2);
3638                 if (vht_oper && !ht_oper) {
3639                         vht_oper = NULL;
3640                         sdata_info(sdata,
3641                                    "AP advertised VHT without HT, disabling both\n");
3642                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3643                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3644                 }
3645
3646                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3647                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3648                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3649                         vht_oper = NULL;
3650                 }
3651         }
3652
3653         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3654                                                      cbss->channel,
3655                                                      ht_oper, vht_oper,
3656                                                      &chandef, false);
3657
3658         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3659                                       local->rx_chains);
3660
3661         rcu_read_unlock();
3662
3663         /* will change later if needed */
3664         sdata->smps_mode = IEEE80211_SMPS_OFF;
3665
3666         /*
3667          * If this fails (possibly due to channel context sharing
3668          * on incompatible channels, e.g. 80+80 and 160 sharing the
3669          * same control channel) try to use a smaller bandwidth.
3670          */
3671         ret = ieee80211_vif_use_channel(sdata, &chandef,
3672                                         IEEE80211_CHANCTX_SHARED);
3673
3674         /* don't downgrade for 5 and 10 MHz channels, though. */
3675         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3676             chandef.width == NL80211_CHAN_WIDTH_10)
3677                 return ret;
3678
3679         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3680                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3681                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3682                                                 IEEE80211_CHANCTX_SHARED);
3683         }
3684         return ret;
3685 }
3686
3687 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3688                                      struct cfg80211_bss *cbss, bool assoc)
3689 {
3690         struct ieee80211_local *local = sdata->local;
3691         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3692         struct ieee80211_bss *bss = (void *)cbss->priv;
3693         struct sta_info *new_sta = NULL;
3694         bool have_sta = false;
3695         int err;
3696
3697         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3698                 return -EINVAL;
3699
3700         if (assoc) {
3701                 rcu_read_lock();
3702                 have_sta = sta_info_get(sdata, cbss->bssid);
3703                 rcu_read_unlock();
3704         }
3705
3706         if (!have_sta) {
3707                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3708                 if (!new_sta)
3709                         return -ENOMEM;
3710         }
3711         if (new_sta) {
3712                 u32 rates = 0, basic_rates = 0;
3713                 bool have_higher_than_11mbit;
3714                 int min_rate = INT_MAX, min_rate_index = -1;
3715                 struct ieee80211_chanctx_conf *chanctx_conf;
3716                 struct ieee80211_supported_band *sband;
3717                 const struct cfg80211_bss_ies *ies;
3718                 int shift;
3719                 u32 rate_flags;
3720
3721                 sband = local->hw.wiphy->bands[cbss->channel->band];
3722
3723                 err = ieee80211_prep_channel(sdata, cbss);
3724                 if (err) {
3725                         sta_info_free(local, new_sta);
3726                         return -EINVAL;
3727                 }
3728                 shift = ieee80211_vif_get_shift(&sdata->vif);
3729
3730                 rcu_read_lock();
3731                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3732                 if (WARN_ON(!chanctx_conf)) {
3733                         rcu_read_unlock();
3734                         return -EINVAL;
3735                 }
3736                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
3737                 rcu_read_unlock();
3738
3739                 ieee80211_get_rates(sband, bss->supp_rates,
3740                                     bss->supp_rates_len,
3741                                     &rates, &basic_rates,
3742                                     &have_higher_than_11mbit,
3743                                     &min_rate, &min_rate_index,
3744                                     shift, rate_flags);
3745
3746                 /*
3747                  * This used to be a workaround for basic rates missing
3748                  * in the association response frame. Now that we no
3749                  * longer use the basic rates from there, it probably
3750                  * doesn't happen any more, but keep the workaround so
3751                  * in case some *other* APs are buggy in different ways
3752                  * we can connect -- with a warning.
3753                  */
3754                 if (!basic_rates && min_rate_index >= 0) {
3755                         sdata_info(sdata,
3756                                    "No basic rates, using min rate instead\n");
3757                         basic_rates = BIT(min_rate_index);
3758                 }
3759
3760                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3761                 sdata->vif.bss_conf.basic_rates = basic_rates;
3762
3763                 /* cf. IEEE 802.11 9.2.12 */
3764                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3765                     have_higher_than_11mbit)
3766                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3767                 else
3768                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3769
3770                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3771
3772                 /* set timing information */
3773                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3774                 rcu_read_lock();
3775                 ies = rcu_dereference(cbss->beacon_ies);
3776                 if (ies) {
3777                         const u8 *tim_ie;
3778
3779                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3780                         sdata->vif.bss_conf.sync_device_ts =
3781                                 bss->device_ts_beacon;
3782                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3783                                                   ies->data, ies->len);
3784                         if (tim_ie && tim_ie[1] >= 2)
3785                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
3786                         else
3787                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3788                 } else if (!(local->hw.flags &
3789                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
3790                         ies = rcu_dereference(cbss->proberesp_ies);
3791                         /* must be non-NULL since beacon IEs were NULL */
3792                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3793                         sdata->vif.bss_conf.sync_device_ts =
3794                                 bss->device_ts_presp;
3795                         sdata->vif.bss_conf.sync_dtim_count = 0;
3796                 } else {
3797                         sdata->vif.bss_conf.sync_tsf = 0;
3798                         sdata->vif.bss_conf.sync_device_ts = 0;
3799                         sdata->vif.bss_conf.sync_dtim_count = 0;
3800                 }
3801                 rcu_read_unlock();
3802
3803                 /* tell driver about BSSID, basic rates and timing */
3804                 ieee80211_bss_info_change_notify(sdata,
3805                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3806                         BSS_CHANGED_BEACON_INT);
3807
3808                 if (assoc)
3809                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3810
3811                 err = sta_info_insert(new_sta);
3812                 new_sta = NULL;
3813                 if (err) {
3814                         sdata_info(sdata,
3815                                    "failed to insert STA entry for the AP (error %d)\n",
3816                                    err);
3817                         return err;
3818                 }
3819         } else
3820                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3821
3822         return 0;
3823 }
3824
3825 /* config hooks */
3826 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3827                        struct cfg80211_auth_request *req)
3828 {
3829         struct ieee80211_local *local = sdata->local;
3830         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3831         struct ieee80211_mgd_auth_data *auth_data;
3832         u16 auth_alg;
3833         int err;
3834
3835         /* prepare auth data structure */
3836
3837         switch (req->auth_type) {
3838         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3839                 auth_alg = WLAN_AUTH_OPEN;
3840                 break;
3841         case NL80211_AUTHTYPE_SHARED_KEY:
3842                 if (IS_ERR(local->wep_tx_tfm))
3843                         return -EOPNOTSUPP;
3844                 auth_alg = WLAN_AUTH_SHARED_KEY;
3845                 break;
3846         case NL80211_AUTHTYPE_FT:
3847                 auth_alg = WLAN_AUTH_FT;
3848                 break;
3849         case NL80211_AUTHTYPE_NETWORK_EAP:
3850                 auth_alg = WLAN_AUTH_LEAP;
3851                 break;
3852         case NL80211_AUTHTYPE_SAE:
3853                 auth_alg = WLAN_AUTH_SAE;
3854                 break;
3855         default:
3856                 return -EOPNOTSUPP;
3857         }
3858
3859         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3860                             req->ie_len, GFP_KERNEL);
3861         if (!auth_data)
3862                 return -ENOMEM;
3863
3864         auth_data->bss = req->bss;
3865
3866         if (req->sae_data_len >= 4) {
3867                 __le16 *pos = (__le16 *) req->sae_data;
3868                 auth_data->sae_trans = le16_to_cpu(pos[0]);
3869                 auth_data->sae_status = le16_to_cpu(pos[1]);
3870                 memcpy(auth_data->data, req->sae_data + 4,
3871                        req->sae_data_len - 4);
3872                 auth_data->data_len += req->sae_data_len - 4;
3873         }
3874
3875         if (req->ie && req->ie_len) {
3876                 memcpy(&auth_data->data[auth_data->data_len],
3877                        req->ie, req->ie_len);
3878                 auth_data->data_len += req->ie_len;
3879         }
3880
3881         if (req->key && req->key_len) {
3882                 auth_data->key_len = req->key_len;
3883                 auth_data->key_idx = req->key_idx;
3884                 memcpy(auth_data->key, req->key, req->key_len);
3885         }
3886
3887         auth_data->algorithm = auth_alg;
3888
3889         /* try to authenticate/probe */
3890
3891         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3892             ifmgd->assoc_data) {
3893                 err = -EBUSY;
3894                 goto err_free;
3895         }
3896
3897         if (ifmgd->auth_data)
3898                 ieee80211_destroy_auth_data(sdata, false);
3899
3900         /* prep auth_data so we don't go into idle on disassoc */
3901         ifmgd->auth_data = auth_data;
3902
3903         if (ifmgd->associated) {
3904                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3905
3906                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3907                                        WLAN_REASON_UNSPECIFIED,
3908                                        false, frame_buf);
3909
3910                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3911                                       sizeof(frame_buf));
3912         }
3913
3914         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3915
3916         err = ieee80211_prep_connection(sdata, req->bss, false);
3917         if (err)
3918                 goto err_clear;
3919
3920         err = ieee80211_probe_auth(sdata);
3921         if (err) {
3922                 sta_info_destroy_addr(sdata, req->bss->bssid);
3923                 goto err_clear;
3924         }
3925
3926         /* hold our own reference */
3927         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
3928         return 0;
3929
3930  err_clear:
3931         memset(ifmgd->bssid, 0, ETH_ALEN);
3932         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3933         ifmgd->auth_data = NULL;
3934  err_free:
3935         kfree(auth_data);
3936         return err;
3937 }
3938
3939 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
3940                                         const u8 *wmm_param, int len)
3941 {
3942         const u8 *pos;
3943         size_t left;
3944
3945         if (len < 8)
3946                 return false;
3947
3948         if (wmm_param[5] != 1 /* version */)
3949                 return false;
3950
3951         pos = wmm_param + 8;
3952         left = len - 8;
3953
3954         for (; left >= 4; left -= 4, pos += 4) {
3955                 u8 aifsn = pos[0] & 0x0f;
3956                 u8 ecwmin = pos[1] & 0x0f;
3957                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
3958                 int aci = (pos[0] >> 5) & 0x03;
3959
3960                 if (aifsn < 2) {
3961                         sdata_info(sdata,
3962                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
3963                                    aifsn, aci);
3964                         return false;
3965                 }
3966                 if (ecwmin > ecwmax) {
3967                         sdata_info(sdata,
3968                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
3969                                    ecwmin, ecwmax, aci);
3970                         return false;
3971                 }
3972         }
3973
3974         return true;
3975 }
3976
3977 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3978                         struct cfg80211_assoc_request *req)
3979 {
3980         struct ieee80211_local *local = sdata->local;
3981         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3982         struct ieee80211_bss *bss = (void *)req->bss->priv;
3983         struct ieee80211_mgd_assoc_data *assoc_data;
3984         const struct cfg80211_bss_ies *beacon_ies;
3985         struct ieee80211_supported_band *sband;
3986         const u8 *ssidie, *ht_ie, *vht_ie;
3987         int i, err;
3988
3989         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3990         if (!assoc_data)
3991                 return -ENOMEM;
3992
3993         rcu_read_lock();
3994         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3995         if (!ssidie) {
3996                 rcu_read_unlock();
3997                 kfree(assoc_data);
3998                 return -EINVAL;
3999         }
4000         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4001         assoc_data->ssid_len = ssidie[1];
4002         rcu_read_unlock();
4003
4004         if (ifmgd->associated) {
4005                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4006
4007                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4008                                        WLAN_REASON_UNSPECIFIED,
4009                                        false, frame_buf);
4010
4011                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4012                                       sizeof(frame_buf));
4013         }
4014
4015         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4016                 err = -EBUSY;
4017                 goto err_free;
4018         }
4019
4020         if (ifmgd->assoc_data) {
4021                 err = -EBUSY;
4022                 goto err_free;
4023         }
4024
4025         if (ifmgd->auth_data) {
4026                 bool match;
4027
4028                 /* keep sta info, bssid if matching */
4029                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4030                 ieee80211_destroy_auth_data(sdata, match);
4031         }
4032
4033         /* prepare assoc data */
4034
4035         ifmgd->beacon_crc_valid = false;
4036
4037         assoc_data->wmm = bss->wmm_used &&
4038                           (local->hw.queues >= IEEE80211_NUM_ACS);
4039         if (assoc_data->wmm) {
4040                 /* try to check validity of WMM params IE */
4041                 const struct cfg80211_bss_ies *ies;
4042                 const u8 *wp, *start, *end;
4043
4044                 rcu_read_lock();
4045                 ies = rcu_dereference(req->bss->ies);
4046                 start = ies->data;
4047                 end = start + ies->len;
4048
4049                 while (true) {
4050                         wp = cfg80211_find_vendor_ie(
4051                                 WLAN_OUI_MICROSOFT,
4052                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4053                                 start, end - start);
4054                         if (!wp)
4055                                 break;
4056                         start = wp + wp[1] + 2;
4057                         /* if this IE is too short, try the next */
4058                         if (wp[1] <= 4)
4059                                 continue;
4060                         /* if this IE is WMM params, we found what we wanted */
4061                         if (wp[6] == 1)
4062                                 break;
4063                 }
4064
4065                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4066                                                         wp[1] - 2)) {
4067                         assoc_data->wmm = false;
4068                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4069                 }
4070                 rcu_read_unlock();
4071         }
4072
4073         /*
4074          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4075          * We still associate in non-HT mode (11a/b/g) if any one of these
4076          * ciphers is configured as pairwise.
4077          * We can set this to true for non-11n hardware, that'll be checked
4078          * separately along with the peer capabilities.
4079          */
4080         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4081                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4082                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4083                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4084                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4085                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4086                         netdev_info(sdata->dev,
4087                                     "disabling HT/VHT due to WEP/TKIP use\n");
4088                 }
4089         }
4090
4091         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4092                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4093                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4094         }
4095
4096         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4097                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4098
4099         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4100         sband = local->hw.wiphy->bands[req->bss->channel->band];
4101         if (!sband->ht_cap.ht_supported ||
4102             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4103             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4104                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4105                 if (!bss->wmm_used &&
4106                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4107                         netdev_info(sdata->dev,
4108                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4109         }
4110
4111         /* disable VHT if we don't support it or the AP doesn't use WMM */
4112         if (!sband->vht_cap.vht_supported ||
4113             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4114             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4115                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4116                 if (!bss->wmm_used &&
4117                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4118                         netdev_info(sdata->dev,
4119                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4120         }
4121
4122         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4123         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4124                sizeof(ifmgd->ht_capa_mask));
4125
4126         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4127         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4128                sizeof(ifmgd->vht_capa_mask));
4129
4130         if (req->ie && req->ie_len) {
4131                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4132                 assoc_data->ie_len = req->ie_len;
4133         }
4134
4135         assoc_data->bss = req->bss;
4136
4137         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4138                 if (ifmgd->powersave)
4139                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4140                 else
4141                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4142         } else
4143                 sdata->smps_mode = ifmgd->req_smps;
4144
4145         assoc_data->capability = req->bss->capability;
4146         assoc_data->supp_rates = bss->supp_rates;
4147         assoc_data->supp_rates_len = bss->supp_rates_len;
4148
4149         rcu_read_lock();
4150         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4151         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4152                 assoc_data->ap_ht_param =
4153                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4154         else
4155                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4156         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4157         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4158                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4159                        sizeof(struct ieee80211_vht_cap));
4160         else
4161                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4162         rcu_read_unlock();
4163
4164         if (bss->wmm_used && bss->uapsd_supported &&
4165             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
4166             sdata->wmm_acm != 0xff) {
4167                 assoc_data->uapsd = true;
4168                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4169         } else {
4170                 assoc_data->uapsd = false;
4171                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4172         }
4173
4174         if (req->prev_bssid)
4175                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4176
4177         if (req->use_mfp) {
4178                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4179                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4180         } else {
4181                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4182                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4183         }
4184
4185         if (req->crypto.control_port)
4186                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4187         else
4188                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4189
4190         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4191         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4192
4193         /* kick off associate process */
4194
4195         ifmgd->assoc_data = assoc_data;
4196         ifmgd->dtim_period = 0;
4197         ifmgd->have_beacon = false;
4198
4199         err = ieee80211_prep_connection(sdata, req->bss, true);
4200         if (err)
4201                 goto err_clear;
4202
4203         rcu_read_lock();
4204         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4205
4206         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4207             !beacon_ies) {
4208                 /*
4209                  * Wait up to one beacon interval ...
4210                  * should this be more if we miss one?
4211                  */
4212                 sdata_info(sdata, "waiting for beacon from %pM\n",
4213                            ifmgd->bssid);
4214                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4215                 assoc_data->timeout_started = true;
4216                 assoc_data->need_beacon = true;
4217         } else if (beacon_ies) {
4218                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4219                                                     beacon_ies->data,
4220                                                     beacon_ies->len);
4221                 u8 dtim_count = 0;
4222
4223                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4224                         const struct ieee80211_tim_ie *tim;
4225                         tim = (void *)(tim_ie + 2);
4226                         ifmgd->dtim_period = tim->dtim_period;
4227                         dtim_count = tim->dtim_count;
4228                 }
4229                 ifmgd->have_beacon = true;
4230                 assoc_data->timeout = jiffies;
4231                 assoc_data->timeout_started = true;
4232
4233                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4234                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4235                         sdata->vif.bss_conf.sync_device_ts =
4236                                 bss->device_ts_beacon;
4237                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4238                 }
4239         } else {
4240                 assoc_data->timeout = jiffies;
4241                 assoc_data->timeout_started = true;
4242         }
4243         rcu_read_unlock();
4244
4245         run_again(sdata, assoc_data->timeout);
4246
4247         if (bss->corrupt_data) {
4248                 char *corrupt_type = "data";
4249                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4250                         if (bss->corrupt_data &
4251                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4252                                 corrupt_type = "beacon and probe response";
4253                         else
4254                                 corrupt_type = "beacon";
4255                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4256                         corrupt_type = "probe response";
4257                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4258                            corrupt_type);
4259         }
4260
4261         return 0;
4262  err_clear:
4263         memset(ifmgd->bssid, 0, ETH_ALEN);
4264         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4265         ifmgd->assoc_data = NULL;
4266  err_free:
4267         kfree(assoc_data);
4268         return err;
4269 }
4270
4271 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4272                          struct cfg80211_deauth_request *req)
4273 {
4274         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4275         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4276         bool tx = !req->local_state_change;
4277         bool report_frame = false;
4278
4279         sdata_info(sdata,
4280                    "deauthenticating from %pM by local choice (reason=%d)\n",
4281                    req->bssid, req->reason_code);
4282
4283         if (ifmgd->auth_data) {
4284                 drv_mgd_prepare_tx(sdata->local, sdata);
4285                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4286                                                IEEE80211_STYPE_DEAUTH,
4287                                                req->reason_code, tx,
4288                                                frame_buf);
4289                 ieee80211_destroy_auth_data(sdata, false);
4290
4291                 report_frame = true;
4292                 goto out;
4293         }
4294
4295         if (ifmgd->associated &&
4296             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4297                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4298                                        req->reason_code, tx, frame_buf);
4299                 report_frame = true;
4300         }
4301
4302  out:
4303         if (report_frame)
4304                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4305                                       IEEE80211_DEAUTH_FRAME_LEN);
4306
4307         return 0;
4308 }
4309
4310 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4311                            struct cfg80211_disassoc_request *req)
4312 {
4313         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4314         u8 bssid[ETH_ALEN];
4315         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4316
4317         /*
4318          * cfg80211 should catch this ... but it's racy since
4319          * we can receive a disassoc frame, process it, hand it
4320          * to cfg80211 while that's in a locked section already
4321          * trying to tell us that the user wants to disconnect.
4322          */
4323         if (ifmgd->associated != req->bss)
4324                 return -ENOLINK;
4325
4326         sdata_info(sdata,
4327                    "disassociating from %pM by local choice (reason=%d)\n",
4328                    req->bss->bssid, req->reason_code);
4329
4330         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4331         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4332                                req->reason_code, !req->local_state_change,
4333                                frame_buf);
4334
4335         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4336                               IEEE80211_DEAUTH_FRAME_LEN);
4337
4338         return 0;
4339 }
4340
4341 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4342 {
4343         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4344
4345         /*
4346          * Make sure some work items will not run after this,
4347          * they will not do anything but might not have been
4348          * cancelled when disconnecting.
4349          */
4350         cancel_work_sync(&ifmgd->monitor_work);
4351         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4352         cancel_work_sync(&ifmgd->request_smps_work);
4353         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4354         cancel_work_sync(&ifmgd->chswitch_work);
4355
4356         sdata_lock(sdata);
4357         if (ifmgd->assoc_data) {
4358                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4359                 ieee80211_destroy_assoc_data(sdata, false);
4360                 cfg80211_assoc_timeout(sdata->dev, bss);
4361         }
4362         if (ifmgd->auth_data)
4363                 ieee80211_destroy_auth_data(sdata, false);
4364         del_timer_sync(&ifmgd->timer);
4365         sdata_unlock(sdata);
4366 }
4367
4368 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4369                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4370                                gfp_t gfp)
4371 {
4372         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4373
4374         trace_api_cqm_rssi_notify(sdata, rssi_event);
4375
4376         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4377 }
4378 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);