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         u8 count;
 962         u8 mode;
 963         struct cfg80211_chan_def new_chandef = {};
 964         int res;
 965
 966         sdata_assert_lock(sdata);
 967
 968         if (!cbss)
 969                 return;
 970
 971         if (local->scanning)
 972                 return;
 973
 974         /* disregard subsequent announcements if we are already processing */
 975         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 976                 return;
 977
 978         current_band = cbss->channel->band;
 979         res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
 980                                            ifmgd->flags,
 981                                            ifmgd->associated->bssid, &count,
 982                                            &mode, &new_chandef);
 983         if (res < 0)
 984                 ieee80211_queue_work(&local->hw,
 985                                      &ifmgd->csa_connection_drop_work);
 986         if (res)
 987                 return;
 988
 989         if (!cfg80211_chandef_usable(local->hw.wiphy, &new_chandef,
 990                                      IEEE80211_CHAN_DISABLED)) {
 991                 sdata_info(sdata,
 992                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
 993                            ifmgd->associated->bssid,
 994                            new_chandef.chan->center_freq,
 995                            new_chandef.width, new_chandef.center_freq1,
 996                            new_chandef.center_freq2);
 997                 ieee80211_queue_work(&local->hw,
 998                                      &ifmgd->csa_connection_drop_work);
 999                 return;
1000         }
1001
1002         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1003         sdata->vif.csa_active = true;
1004
1005         mutex_lock(&local->chanctx_mtx);
1006         if (local->use_chanctx) {
1007                 u32 num_chanctx = 0;
1008                 list_for_each_entry(chanctx, &local->chanctx_list, list)
1009                        num_chanctx++;
1010
1011                 if (num_chanctx > 1 ||
1012                     !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1013                         sdata_info(sdata,
1014                                    "not handling chan-switch with channel contexts\n");
1015                         ieee80211_queue_work(&local->hw,
1016                                              &ifmgd->csa_connection_drop_work);
1017                         mutex_unlock(&local->chanctx_mtx);
1018                         return;
1019                 }
1020         }
1021
1022         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1023                 ieee80211_queue_work(&local->hw,
1024                                      &ifmgd->csa_connection_drop_work);
1025                 mutex_unlock(&local->chanctx_mtx);
1026                 return;
1027         }
1028         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1029                                struct ieee80211_chanctx, conf);
1030         if (chanctx->refcount > 1) {
1031                 sdata_info(sdata,
1032                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
1033                 ieee80211_queue_work(&local->hw,
1034                                      &ifmgd->csa_connection_drop_work);
1035                 mutex_unlock(&local->chanctx_mtx);
1036                 return;
1037         }
1038         mutex_unlock(&local->chanctx_mtx);
1039
1040         local->csa_chandef = new_chandef;
1041
1042         if (mode)
1043                 ieee80211_stop_queues_by_reason(&local->hw,
1044                                 IEEE80211_MAX_QUEUE_MAP,
1045                                 IEEE80211_QUEUE_STOP_REASON_CSA);
1046
1047         if (local->ops->channel_switch) {
1048                 /* use driver's channel switch callback */
1049                 struct ieee80211_channel_switch ch_switch = {
1050                         .timestamp = timestamp,
1051                         .block_tx = mode,
1052                         .chandef = new_chandef,
1053                         .count = count,
1054                 };
1055
1056                 drv_channel_switch(local, &ch_switch);
1057                 return;
1058         }
1059
1060         /* channel switch handled in software */
1061         if (count <= 1)
1062                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1063         else
1064                 mod_timer(&ifmgd->chswitch_timer,
1065                           TU_TO_EXP_TIME(count * cbss->beacon_interval));
1066 }
1067
1068 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1069                                        struct ieee80211_channel *channel,
1070                                        const u8 *country_ie, u8 country_ie_len,
1071                                        const u8 *pwr_constr_elem)
1072 {
1073         struct ieee80211_country_ie_triplet *triplet;
1074         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1075         int i, chan_pwr, chan_increment, new_ap_level;
1076         bool have_chan_pwr = false;
1077
1078         /* Invalid IE */
1079         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1080                 return 0;
1081
1082         triplet = (void *)(country_ie + 3);
1083         country_ie_len -= 3;
1084
1085         switch (channel->band) {
1086         default:
1087                 WARN_ON_ONCE(1);
1088                 /* fall through */
1089         case IEEE80211_BAND_2GHZ:
1090         case IEEE80211_BAND_60GHZ:
1091                 chan_increment = 1;
1092                 break;
1093         case IEEE80211_BAND_5GHZ:
1094                 chan_increment = 4;
1095                 break;
1096         }
1097
1098         /* find channel */
1099         while (country_ie_len >= 3) {
1100                 u8 first_channel = triplet->chans.first_channel;
1101
1102                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1103                         goto next;
1104
1105                 for (i = 0; i < triplet->chans.num_channels; i++) {
1106                         if (first_channel + i * chan_increment == chan) {
1107                                 have_chan_pwr = true;
1108                                 chan_pwr = triplet->chans.max_power;
1109                                 break;
1110                         }
1111                 }
1112                 if (have_chan_pwr)
1113                         break;
1114
1115  next:
1116                 triplet++;
1117                 country_ie_len -= 3;
1118         }
1119
1120         if (!have_chan_pwr)
1121                 return 0;
1122
1123         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1124
1125         if (sdata->ap_power_level == new_ap_level)
1126                 return 0;
1127
1128         sdata_info(sdata,
1129                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1130                    new_ap_level, chan_pwr, *pwr_constr_elem,
1131                    sdata->u.mgd.bssid);
1132         sdata->ap_power_level = new_ap_level;
1133         if (__ieee80211_recalc_txpower(sdata))
1134                 return BSS_CHANGED_TXPOWER;
1135         return 0;
1136 }
1137
1138 /* powersave */
1139 static void ieee80211_enable_ps(struct ieee80211_local *local,
1140                                 struct ieee80211_sub_if_data *sdata)
1141 {
1142         struct ieee80211_conf *conf = &local->hw.conf;
1143
1144         /*
1145          * If we are scanning right now then the parameters will
1146          * take effect when scan finishes.
1147          */
1148         if (local->scanning)
1149                 return;
1150
1151         if (conf->dynamic_ps_timeout > 0 &&
1152             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1153                 mod_timer(&local->dynamic_ps_timer, jiffies +
1154                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1155         } else {
1156                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1157                         ieee80211_send_nullfunc(local, sdata, 1);
1158
1159                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1160                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1161                         return;
1162
1163                 conf->flags |= IEEE80211_CONF_PS;
1164                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1165         }
1166 }
1167
1168 static void ieee80211_change_ps(struct ieee80211_local *local)
1169 {
1170         struct ieee80211_conf *conf = &local->hw.conf;
1171
1172         if (local->ps_sdata) {
1173                 ieee80211_enable_ps(local, local->ps_sdata);
1174         } else if (conf->flags & IEEE80211_CONF_PS) {
1175                 conf->flags &= ~IEEE80211_CONF_PS;
1176                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1177                 del_timer_sync(&local->dynamic_ps_timer);
1178                 cancel_work_sync(&local->dynamic_ps_enable_work);
1179         }
1180 }
1181
1182 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1183 {
1184         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1185         struct sta_info *sta = NULL;
1186         bool authorized = false;
1187
1188         if (!mgd->powersave)
1189                 return false;
1190
1191         if (mgd->broken_ap)
1192                 return false;
1193
1194         if (!mgd->associated)
1195                 return false;
1196
1197         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1198                 return false;
1199
1200         if (!mgd->have_beacon)
1201                 return false;
1202
1203         rcu_read_lock();
1204         sta = sta_info_get(sdata, mgd->bssid);
1205         if (sta)
1206                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1207         rcu_read_unlock();
1208
1209         return authorized;
1210 }
1211
1212 /* need to hold RTNL or interface lock */
1213 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1214 {
1215         struct ieee80211_sub_if_data *sdata, *found = NULL;
1216         int count = 0;
1217         int timeout;
1218
1219         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1220                 local->ps_sdata = NULL;
1221                 return;
1222         }
1223
1224         list_for_each_entry(sdata, &local->interfaces, list) {
1225                 if (!ieee80211_sdata_running(sdata))
1226                         continue;
1227                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1228                         /* If an AP vif is found, then disable PS
1229                          * by setting the count to zero thereby setting
1230                          * ps_sdata to NULL.
1231                          */
1232                         count = 0;
1233                         break;
1234                 }
1235                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1236                         continue;
1237                 found = sdata;
1238                 count++;
1239         }
1240
1241         if (count == 1 && ieee80211_powersave_allowed(found)) {
1242                 s32 beaconint_us;
1243
1244                 if (latency < 0)
1245                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1246
1247                 beaconint_us = ieee80211_tu_to_usec(
1248                                         found->vif.bss_conf.beacon_int);
1249
1250                 timeout = local->dynamic_ps_forced_timeout;
1251                 if (timeout < 0) {
1252                         /*
1253                          * Go to full PSM if the user configures a very low
1254                          * latency requirement.
1255                          * The 2000 second value is there for compatibility
1256                          * until the PM_QOS_NETWORK_LATENCY is configured
1257                          * with real values.
1258                          */
1259                         if (latency > (1900 * USEC_PER_MSEC) &&
1260                             latency != (2000 * USEC_PER_SEC))
1261                                 timeout = 0;
1262                         else
1263                                 timeout = 100;
1264                 }
1265                 local->hw.conf.dynamic_ps_timeout = timeout;
1266
1267                 if (beaconint_us > latency) {
1268                         local->ps_sdata = NULL;
1269                 } else {
1270                         int maxslp = 1;
1271                         u8 dtimper = found->u.mgd.dtim_period;
1272
1273                         /* If the TIM IE is invalid, pretend the value is 1 */
1274                         if (!dtimper)
1275                                 dtimper = 1;
1276                         else if (dtimper > 1)
1277                                 maxslp = min_t(int, dtimper,
1278                                                     latency / beaconint_us);
1279
1280                         local->hw.conf.max_sleep_period = maxslp;
1281                         local->hw.conf.ps_dtim_period = dtimper;
1282                         local->ps_sdata = found;
1283                 }
1284         } else {
1285                 local->ps_sdata = NULL;
1286         }
1287
1288         ieee80211_change_ps(local);
1289 }
1290
1291 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1292 {
1293         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1294
1295         if (sdata->vif.bss_conf.ps != ps_allowed) {
1296                 sdata->vif.bss_conf.ps = ps_allowed;
1297                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1298         }
1299 }
1300
1301 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1302 {
1303         struct ieee80211_local *local =
1304                 container_of(work, struct ieee80211_local,
1305                              dynamic_ps_disable_work);
1306
1307         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1308                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1309                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1310         }
1311
1312         ieee80211_wake_queues_by_reason(&local->hw,
1313                                         IEEE80211_MAX_QUEUE_MAP,
1314                                         IEEE80211_QUEUE_STOP_REASON_PS);
1315 }
1316
1317 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1318 {
1319         struct ieee80211_local *local =
1320                 container_of(work, struct ieee80211_local,
1321                              dynamic_ps_enable_work);
1322         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1323         struct ieee80211_if_managed *ifmgd;
1324         unsigned long flags;
1325         int q;
1326
1327         /* can only happen when PS was just disabled anyway */
1328         if (!sdata)
1329                 return;
1330
1331         ifmgd = &sdata->u.mgd;
1332
1333         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1334                 return;
1335
1336         if (local->hw.conf.dynamic_ps_timeout > 0) {
1337                 /* don't enter PS if TX frames are pending */
1338                 if (drv_tx_frames_pending(local)) {
1339                         mod_timer(&local->dynamic_ps_timer, jiffies +
1340                                   msecs_to_jiffies(
1341                                   local->hw.conf.dynamic_ps_timeout));
1342                         return;
1343                 }
1344
1345                 /*
1346                  * transmission can be stopped by others which leads to
1347                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1348                  * is not the actual idle state.
1349                  */
1350                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1351                 for (q = 0; q < local->hw.queues; q++) {
1352                         if (local->queue_stop_reasons[q]) {
1353                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1354                                                        flags);
1355                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1356                                           msecs_to_jiffies(
1357                                           local->hw.conf.dynamic_ps_timeout));
1358                                 return;
1359                         }
1360                 }
1361                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1362         }
1363
1364         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1365             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1366                 if (drv_tx_frames_pending(local)) {
1367                         mod_timer(&local->dynamic_ps_timer, jiffies +
1368                                   msecs_to_jiffies(
1369                                   local->hw.conf.dynamic_ps_timeout));
1370                 } else {
1371                         ieee80211_send_nullfunc(local, sdata, 1);
1372                         /* Flush to get the tx status of nullfunc frame */
1373                         ieee80211_flush_queues(local, sdata);
1374                 }
1375         }
1376
1377         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1378               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1379             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1380                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1381                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1382                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1383         }
1384 }
1385
1386 void ieee80211_dynamic_ps_timer(unsigned long data)
1387 {
1388         struct ieee80211_local *local = (void *) data;
1389
1390         if (local->quiescing || local->suspended)
1391                 return;
1392
1393         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1394 }
1395
1396 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1397 {
1398         struct delayed_work *delayed_work =
1399                 container_of(work, struct delayed_work, work);
1400         struct ieee80211_sub_if_data *sdata =
1401                 container_of(delayed_work, struct ieee80211_sub_if_data,
1402                              dfs_cac_timer_work);
1403
1404         ieee80211_vif_release_channel(sdata);
1405
1406         cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL);
1407 }
1408
1409 /* MLME */
1410 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1411                                      struct ieee80211_sub_if_data *sdata,
1412                                      const u8 *wmm_param, size_t wmm_param_len)
1413 {
1414         struct ieee80211_tx_queue_params params;
1415         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1416         size_t left;
1417         int count;
1418         const u8 *pos;
1419         u8 uapsd_queues = 0;
1420
1421         if (!local->ops->conf_tx)
1422                 return false;
1423
1424         if (local->hw.queues < IEEE80211_NUM_ACS)
1425                 return false;
1426
1427         if (!wmm_param)
1428                 return false;
1429
1430         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1431                 return false;
1432
1433         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1434                 uapsd_queues = ifmgd->uapsd_queues;
1435
1436         count = wmm_param[6] & 0x0f;
1437         if (count == ifmgd->wmm_last_param_set)
1438                 return false;
1439         ifmgd->wmm_last_param_set = count;
1440
1441         pos = wmm_param + 8;
1442         left = wmm_param_len - 8;
1443
1444         memset(&params, 0, sizeof(params));
1445
1446         sdata->wmm_acm = 0;
1447         for (; left >= 4; left -= 4, pos += 4) {
1448                 int aci = (pos[0] >> 5) & 0x03;
1449                 int acm = (pos[0] >> 4) & 0x01;
1450                 bool uapsd = false;
1451                 int queue;
1452
1453                 switch (aci) {
1454                 case 1: /* AC_BK */
1455                         queue = 3;
1456                         if (acm)
1457                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1458                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1459                                 uapsd = true;
1460                         break;
1461                 case 2: /* AC_VI */
1462                         queue = 1;
1463                         if (acm)
1464                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1465                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1466                                 uapsd = true;
1467                         break;
1468                 case 3: /* AC_VO */
1469                         queue = 0;
1470                         if (acm)
1471                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1472                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1473                                 uapsd = true;
1474                         break;
1475                 case 0: /* AC_BE */
1476                 default:
1477                         queue = 2;
1478                         if (acm)
1479                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1480                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1481                                 uapsd = true;
1482                         break;
1483                 }
1484
1485                 params.aifs = pos[0] & 0x0f;
1486                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1487                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1488                 params.txop = get_unaligned_le16(pos + 2);
1489                 params.acm = acm;
1490                 params.uapsd = uapsd;
1491
1492                 mlme_dbg(sdata,
1493                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1494                          queue, aci, acm,
1495                          params.aifs, params.cw_min, params.cw_max,
1496                          params.txop, params.uapsd);
1497                 sdata->tx_conf[queue] = params;
1498                 if (drv_conf_tx(local, sdata, queue, &params))
1499                         sdata_err(sdata,
1500                                   "failed to set TX queue parameters for queue %d\n",
1501                                   queue);
1502         }
1503
1504         /* enable WMM or activate new settings */
1505         sdata->vif.bss_conf.qos = true;
1506         return true;
1507 }
1508
1509 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1510 {
1511         lockdep_assert_held(&sdata->local->mtx);
1512
1513         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1514         ieee80211_run_deferred_scan(sdata->local);
1515 }
1516
1517 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1518 {
1519         mutex_lock(&sdata->local->mtx);
1520         __ieee80211_stop_poll(sdata);
1521         mutex_unlock(&sdata->local->mtx);
1522 }
1523
1524 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1525                                            u16 capab, bool erp_valid, u8 erp)
1526 {
1527         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1528         u32 changed = 0;
1529         bool use_protection;
1530         bool use_short_preamble;
1531         bool use_short_slot;
1532
1533         if (erp_valid) {
1534                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1535                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1536         } else {
1537                 use_protection = false;
1538                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1539         }
1540
1541         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1542         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1543                 use_short_slot = true;
1544
1545         if (use_protection != bss_conf->use_cts_prot) {
1546                 bss_conf->use_cts_prot = use_protection;
1547                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1548         }
1549
1550         if (use_short_preamble != bss_conf->use_short_preamble) {
1551                 bss_conf->use_short_preamble = use_short_preamble;
1552                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1553         }
1554
1555         if (use_short_slot != bss_conf->use_short_slot) {
1556                 bss_conf->use_short_slot = use_short_slot;
1557                 changed |= BSS_CHANGED_ERP_SLOT;
1558         }
1559
1560         return changed;
1561 }
1562
1563 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1564                                      struct cfg80211_bss *cbss,
1565                                      u32 bss_info_changed)
1566 {
1567         struct ieee80211_bss *bss = (void *)cbss->priv;
1568         struct ieee80211_local *local = sdata->local;
1569         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1570
1571         bss_info_changed |= BSS_CHANGED_ASSOC;
1572         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1573                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1574
1575         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1576                 beacon_loss_count * bss_conf->beacon_int));
1577
1578         sdata->u.mgd.associated = cbss;
1579         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1580
1581         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1582
1583         if (sdata->vif.p2p) {
1584                 const struct cfg80211_bss_ies *ies;
1585
1586                 rcu_read_lock();
1587                 ies = rcu_dereference(cbss->ies);
1588                 if (ies) {
1589                         int ret;
1590
1591                         ret = cfg80211_get_p2p_attr(
1592                                         ies->data, ies->len,
1593                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1594                                         (u8 *) &bss_conf->p2p_noa_attr,
1595                                         sizeof(bss_conf->p2p_noa_attr));
1596                         if (ret >= 2) {
1597                                 sdata->u.mgd.p2p_noa_index =
1598                                         bss_conf->p2p_noa_attr.index;
1599                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1600                         }
1601                 }
1602                 rcu_read_unlock();
1603         }
1604
1605         /* just to be sure */
1606         ieee80211_stop_poll(sdata);
1607
1608         ieee80211_led_assoc(local, 1);
1609
1610         if (sdata->u.mgd.have_beacon) {
1611                 /*
1612                  * If the AP is buggy we may get here with no DTIM period
1613                  * known, so assume it's 1 which is the only safe assumption
1614                  * in that case, although if the TIM IE is broken powersave
1615                  * probably just won't work at all.
1616                  */
1617                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1618                 bss_conf->beacon_rate = bss->beacon_rate;
1619                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1620         } else {
1621                 bss_conf->beacon_rate = NULL;
1622                 bss_conf->dtim_period = 0;
1623         }
1624
1625         bss_conf->assoc = 1;
1626
1627         /* Tell the driver to monitor connection quality (if supported) */
1628         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1629             bss_conf->cqm_rssi_thold)
1630                 bss_info_changed |= BSS_CHANGED_CQM;
1631
1632         /* Enable ARP filtering */
1633         if (bss_conf->arp_addr_cnt)
1634                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1635
1636         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1637
1638         mutex_lock(&local->iflist_mtx);
1639         ieee80211_recalc_ps(local, -1);
1640         mutex_unlock(&local->iflist_mtx);
1641
1642         ieee80211_recalc_smps(sdata);
1643         ieee80211_recalc_ps_vif(sdata);
1644
1645         netif_carrier_on(sdata->dev);
1646 }
1647
1648 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1649                                    u16 stype, u16 reason, bool tx,
1650                                    u8 *frame_buf)
1651 {
1652         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1653         struct ieee80211_local *local = sdata->local;
1654         u32 changed = 0;
1655
1656         sdata_assert_lock(sdata);
1657
1658         if (WARN_ON_ONCE(tx && !frame_buf))
1659                 return;
1660
1661         if (WARN_ON(!ifmgd->associated))
1662                 return;
1663
1664         ieee80211_stop_poll(sdata);
1665
1666         ifmgd->associated = NULL;
1667         netif_carrier_off(sdata->dev);
1668
1669         /*
1670          * if we want to get out of ps before disassoc (why?) we have
1671          * to do it before sending disassoc, as otherwise the null-packet
1672          * won't be valid.
1673          */
1674         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1675                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1676                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1677         }
1678         local->ps_sdata = NULL;
1679
1680         /* disable per-vif ps */
1681         ieee80211_recalc_ps_vif(sdata);
1682
1683         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1684         if (tx)
1685                 ieee80211_flush_queues(local, sdata);
1686
1687         /* deauthenticate/disassociate now */
1688         if (tx || frame_buf)
1689                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1690                                                reason, tx, frame_buf);
1691
1692         /* flush out frame */
1693         if (tx)
1694                 ieee80211_flush_queues(local, sdata);
1695
1696         /* clear bssid only after building the needed mgmt frames */
1697         memset(ifmgd->bssid, 0, ETH_ALEN);
1698
1699         /* remove AP and TDLS peers */
1700         sta_info_flush_defer(sdata);
1701
1702         /* finally reset all BSS / config parameters */
1703         changed |= ieee80211_reset_erp_info(sdata);
1704
1705         ieee80211_led_assoc(local, 0);
1706         changed |= BSS_CHANGED_ASSOC;
1707         sdata->vif.bss_conf.assoc = false;
1708
1709         ifmgd->p2p_noa_index = -1;
1710         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1711                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1712
1713         /* on the next assoc, re-program HT/VHT parameters */
1714         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1715         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1716         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1717         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1718
1719         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1720
1721         del_timer_sync(&local->dynamic_ps_timer);
1722         cancel_work_sync(&local->dynamic_ps_enable_work);
1723
1724         /* Disable ARP filtering */
1725         if (sdata->vif.bss_conf.arp_addr_cnt)
1726                 changed |= BSS_CHANGED_ARP_FILTER;
1727
1728         sdata->vif.bss_conf.qos = false;
1729         changed |= BSS_CHANGED_QOS;
1730
1731         /* The BSSID (not really interesting) and HT changed */
1732         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1733         ieee80211_bss_info_change_notify(sdata, changed);
1734
1735         /* disassociated - set to defaults now */
1736         ieee80211_set_wmm_default(sdata, false);
1737
1738         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1739         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1740         del_timer_sync(&sdata->u.mgd.timer);
1741         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1742
1743         sdata->vif.bss_conf.dtim_period = 0;
1744         sdata->vif.bss_conf.beacon_rate = NULL;
1745
1746         ifmgd->have_beacon = false;
1747
1748         ifmgd->flags = 0;
1749         ieee80211_vif_release_channel(sdata);
1750 }
1751
1752 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1753                              struct ieee80211_hdr *hdr)
1754 {
1755         /*
1756          * We can postpone the mgd.timer whenever receiving unicast frames
1757          * from AP because we know that the connection is working both ways
1758          * at that time. But multicast frames (and hence also beacons) must
1759          * be ignored here, because we need to trigger the timer during
1760          * data idle periods for sending the periodic probe request to the
1761          * AP we're connected to.
1762          */
1763         if (is_multicast_ether_addr(hdr->addr1))
1764                 return;
1765
1766         ieee80211_sta_reset_conn_monitor(sdata);
1767 }
1768
1769 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1770 {
1771         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1772         struct ieee80211_local *local = sdata->local;
1773
1774         mutex_lock(&local->mtx);
1775         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
1776                 goto out;
1777
1778         __ieee80211_stop_poll(sdata);
1779
1780         mutex_lock(&local->iflist_mtx);
1781         ieee80211_recalc_ps(local, -1);
1782         mutex_unlock(&local->iflist_mtx);
1783
1784         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1785                 goto out;
1786
1787         /*
1788          * We've received a probe response, but are not sure whether
1789          * we have or will be receiving any beacons or data, so let's
1790          * schedule the timers again, just in case.
1791          */
1792         ieee80211_sta_reset_beacon_monitor(sdata);
1793
1794         mod_timer(&ifmgd->conn_mon_timer,
1795                   round_jiffies_up(jiffies +
1796                                    IEEE80211_CONNECTION_IDLE_TIME));
1797 out:
1798         mutex_unlock(&local->mtx);
1799 }
1800
1801 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1802                              struct ieee80211_hdr *hdr, bool ack)
1803 {
1804         if (!ieee80211_is_data(hdr->frame_control))
1805             return;
1806
1807         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1808             sdata->u.mgd.probe_send_count > 0) {
1809                 if (ack)
1810                         ieee80211_sta_reset_conn_monitor(sdata);
1811                 else
1812                         sdata->u.mgd.nullfunc_failed = true;
1813                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1814                 return;
1815         }
1816
1817         if (ack)
1818                 ieee80211_sta_reset_conn_monitor(sdata);
1819 }
1820
1821 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1822 {
1823         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1824         const u8 *ssid;
1825         u8 *dst = ifmgd->associated->bssid;
1826         u8 unicast_limit = max(1, max_probe_tries - 3);
1827
1828         /*
1829          * Try sending broadcast probe requests for the last three
1830          * probe requests after the first ones failed since some
1831          * buggy APs only support broadcast probe requests.
1832          */
1833         if (ifmgd->probe_send_count >= unicast_limit)
1834                 dst = NULL;
1835
1836         /*
1837          * When the hardware reports an accurate Tx ACK status, it's
1838          * better to send a nullfunc frame instead of a probe request,
1839          * as it will kick us off the AP quickly if we aren't associated
1840          * anymore. The timeout will be reset if the frame is ACKed by
1841          * the AP.
1842          */
1843         ifmgd->probe_send_count++;
1844
1845         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1846                 ifmgd->nullfunc_failed = false;
1847                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1848         } else {
1849                 int ssid_len;
1850
1851                 rcu_read_lock();
1852                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1853                 if (WARN_ON_ONCE(ssid == NULL))
1854                         ssid_len = 0;
1855                 else
1856                         ssid_len = ssid[1];
1857
1858                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1859                                          0, (u32) -1, true, 0,
1860                                          ifmgd->associated->channel, false);
1861                 rcu_read_unlock();
1862         }
1863
1864         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1865         run_again(sdata, ifmgd->probe_timeout);
1866         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1867                 ieee80211_flush_queues(sdata->local, sdata);
1868 }
1869
1870 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1871                                    bool beacon)
1872 {
1873         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1874         bool already = false;
1875
1876         if (!ieee80211_sdata_running(sdata))
1877                 return;
1878
1879         sdata_lock(sdata);
1880
1881         if (!ifmgd->associated)
1882                 goto out;
1883
1884         mutex_lock(&sdata->local->mtx);
1885
1886         if (sdata->local->tmp_channel || sdata->local->scanning) {
1887                 mutex_unlock(&sdata->local->mtx);
1888                 goto out;
1889         }
1890
1891         if (beacon) {
1892                 mlme_dbg_ratelimited(sdata,
1893                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
1894                                      beacon_loss_count);
1895
1896                 ieee80211_cqm_rssi_notify(&sdata->vif,
1897                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
1898                                           GFP_KERNEL);
1899         }
1900
1901         /*
1902          * The driver/our work has already reported this event or the
1903          * connection monitoring has kicked in and we have already sent
1904          * a probe request. Or maybe the AP died and the driver keeps
1905          * reporting until we disassociate...
1906          *
1907          * In either case we have to ignore the current call to this
1908          * function (except for setting the correct probe reason bit)
1909          * because otherwise we would reset the timer every time and
1910          * never check whether we received a probe response!
1911          */
1912         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
1913                 already = true;
1914
1915         mutex_unlock(&sdata->local->mtx);
1916
1917         if (already)
1918                 goto out;
1919
1920         mutex_lock(&sdata->local->iflist_mtx);
1921         ieee80211_recalc_ps(sdata->local, -1);
1922         mutex_unlock(&sdata->local->iflist_mtx);
1923
1924         ifmgd->probe_send_count = 0;
1925         ieee80211_mgd_probe_ap_send(sdata);
1926  out:
1927         sdata_unlock(sdata);
1928 }
1929
1930 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1931                                           struct ieee80211_vif *vif)
1932 {
1933         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1934         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1935         struct cfg80211_bss *cbss;
1936         struct sk_buff *skb;
1937         const u8 *ssid;
1938         int ssid_len;
1939
1940         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1941                 return NULL;
1942
1943         sdata_assert_lock(sdata);
1944
1945         if (ifmgd->associated)
1946                 cbss = ifmgd->associated;
1947         else if (ifmgd->auth_data)
1948                 cbss = ifmgd->auth_data->bss;
1949         else if (ifmgd->assoc_data)
1950                 cbss = ifmgd->assoc_data->bss;
1951         else
1952                 return NULL;
1953
1954         rcu_read_lock();
1955         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1956         if (WARN_ON_ONCE(ssid == NULL))
1957                 ssid_len = 0;
1958         else
1959                 ssid_len = ssid[1];
1960
1961         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1962                                         (u32) -1, cbss->channel,
1963                                         ssid + 2, ssid_len,
1964                                         NULL, 0, true);
1965         rcu_read_unlock();
1966
1967         return skb;
1968 }
1969 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1970
1971 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
1972 {
1973         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1974         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1975
1976         sdata_lock(sdata);
1977         if (!ifmgd->associated) {
1978                 sdata_unlock(sdata);
1979                 return;
1980         }
1981
1982         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1983                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1984                                true, frame_buf);
1985         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1986         sdata->vif.csa_active = false;
1987         ieee80211_wake_queues_by_reason(&sdata->local->hw,
1988                                         IEEE80211_MAX_QUEUE_MAP,
1989                                         IEEE80211_QUEUE_STOP_REASON_CSA);
1990
1991         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
1992                               IEEE80211_DEAUTH_FRAME_LEN);
1993         sdata_unlock(sdata);
1994 }
1995
1996 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1997 {
1998         struct ieee80211_sub_if_data *sdata =
1999                 container_of(work, struct ieee80211_sub_if_data,
2000                              u.mgd.beacon_connection_loss_work);
2001         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2002         struct sta_info *sta;
2003
2004         if (ifmgd->associated) {
2005                 rcu_read_lock();
2006                 sta = sta_info_get(sdata, ifmgd->bssid);
2007                 if (sta)
2008                         sta->beacon_loss_count++;
2009                 rcu_read_unlock();
2010         }
2011
2012         if (ifmgd->connection_loss) {
2013                 sdata_info(sdata, "Connection to AP %pM lost\n",
2014                            ifmgd->bssid);
2015                 __ieee80211_disconnect(sdata);
2016         } else {
2017                 ieee80211_mgd_probe_ap(sdata, true);
2018         }
2019 }
2020
2021 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2022 {
2023         struct ieee80211_sub_if_data *sdata =
2024                 container_of(work, struct ieee80211_sub_if_data,
2025                              u.mgd.csa_connection_drop_work);
2026
2027         __ieee80211_disconnect(sdata);
2028 }
2029
2030 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2031 {
2032         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2033         struct ieee80211_hw *hw = &sdata->local->hw;
2034
2035         trace_api_beacon_loss(sdata);
2036
2037         sdata->u.mgd.connection_loss = false;
2038         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2039 }
2040 EXPORT_SYMBOL(ieee80211_beacon_loss);
2041
2042 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2043 {
2044         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2045         struct ieee80211_hw *hw = &sdata->local->hw;
2046
2047         trace_api_connection_loss(sdata);
2048
2049         sdata->u.mgd.connection_loss = true;
2050         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2051 }
2052 EXPORT_SYMBOL(ieee80211_connection_loss);
2053
2054
2055 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2056                                         bool assoc)
2057 {
2058         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2059
2060         sdata_assert_lock(sdata);
2061
2062         if (!assoc) {
2063                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2064
2065                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2066                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2067                 sdata->u.mgd.flags = 0;
2068                 ieee80211_vif_release_channel(sdata);
2069         }
2070
2071         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2072         kfree(auth_data);
2073         sdata->u.mgd.auth_data = NULL;
2074 }
2075
2076 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2077                                      struct ieee80211_mgmt *mgmt, size_t len)
2078 {
2079         struct ieee80211_local *local = sdata->local;
2080         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2081         u8 *pos;
2082         struct ieee802_11_elems elems;
2083         u32 tx_flags = 0;
2084
2085         pos = mgmt->u.auth.variable;
2086         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2087         if (!elems.challenge)
2088                 return;
2089         auth_data->expected_transaction = 4;
2090         drv_mgd_prepare_tx(sdata->local, sdata);
2091         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2092                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2093                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2094         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2095                             elems.challenge - 2, elems.challenge_len + 2,
2096                             auth_data->bss->bssid, auth_data->bss->bssid,
2097                             auth_data->key, auth_data->key_len,
2098                             auth_data->key_idx, tx_flags);
2099 }
2100
2101 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2102                                    struct ieee80211_mgmt *mgmt, size_t len)
2103 {
2104         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2105         u8 bssid[ETH_ALEN];
2106         u16 auth_alg, auth_transaction, status_code;
2107         struct sta_info *sta;
2108
2109         sdata_assert_lock(sdata);
2110
2111         if (len < 24 + 6)
2112                 return;
2113
2114         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2115                 return;
2116
2117         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2118
2119         if (!ether_addr_equal(bssid, mgmt->bssid))
2120                 return;
2121
2122         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2123         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2124         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2125
2126         if (auth_alg != ifmgd->auth_data->algorithm ||
2127             auth_transaction != ifmgd->auth_data->expected_transaction) {
2128                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2129                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2130                            auth_transaction,
2131                            ifmgd->auth_data->expected_transaction);
2132                 return;
2133         }
2134
2135         if (status_code != WLAN_STATUS_SUCCESS) {
2136                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2137                            mgmt->sa, status_code);
2138                 ieee80211_destroy_auth_data(sdata, false);
2139                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2140                 return;
2141         }
2142
2143         switch (ifmgd->auth_data->algorithm) {
2144         case WLAN_AUTH_OPEN:
2145         case WLAN_AUTH_LEAP:
2146         case WLAN_AUTH_FT:
2147         case WLAN_AUTH_SAE:
2148                 break;
2149         case WLAN_AUTH_SHARED_KEY:
2150                 if (ifmgd->auth_data->expected_transaction != 4) {
2151                         ieee80211_auth_challenge(sdata, mgmt, len);
2152                         /* need another frame */
2153                         return;
2154                 }
2155                 break;
2156         default:
2157                 WARN_ONCE(1, "invalid auth alg %d",
2158                           ifmgd->auth_data->algorithm);
2159                 return;
2160         }
2161
2162         sdata_info(sdata, "authenticated\n");
2163         ifmgd->auth_data->done = true;
2164         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2165         ifmgd->auth_data->timeout_started = true;
2166         run_again(sdata, ifmgd->auth_data->timeout);
2167
2168         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2169             ifmgd->auth_data->expected_transaction != 2) {
2170                 /*
2171                  * Report auth frame to user space for processing since another
2172                  * round of Authentication frames is still needed.
2173                  */
2174                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2175                 return;
2176         }
2177
2178         /* move station state to auth */
2179         mutex_lock(&sdata->local->sta_mtx);
2180         sta = sta_info_get(sdata, bssid);
2181         if (!sta) {
2182                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2183                 goto out_err;
2184         }
2185         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2186                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2187                 goto out_err;
2188         }
2189         mutex_unlock(&sdata->local->sta_mtx);
2190
2191         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2192         return;
2193  out_err:
2194         mutex_unlock(&sdata->local->sta_mtx);
2195         /* ignore frame -- wait for timeout */
2196 }
2197
2198
2199 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2200                                      struct ieee80211_mgmt *mgmt, size_t len)
2201 {
2202         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2203         const u8 *bssid = NULL;
2204         u16 reason_code;
2205
2206         sdata_assert_lock(sdata);
2207
2208         if (len < 24 + 2)
2209                 return;
2210
2211         if (!ifmgd->associated ||
2212             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2213                 return;
2214
2215         bssid = ifmgd->associated->bssid;
2216
2217         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2218
2219         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2220                    bssid, reason_code);
2221
2222         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2223
2224         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2225 }
2226
2227
2228 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2229                                        struct ieee80211_mgmt *mgmt, size_t len)
2230 {
2231         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2232         u16 reason_code;
2233
2234         sdata_assert_lock(sdata);
2235
2236         if (len < 24 + 2)
2237                 return;
2238
2239         if (!ifmgd->associated ||
2240             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2241                 return;
2242
2243         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2244
2245         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2246                    mgmt->sa, reason_code);
2247
2248         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2249
2250         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2251 }
2252
2253 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2254                                 u8 *supp_rates, unsigned int supp_rates_len,
2255                                 u32 *rates, u32 *basic_rates,
2256                                 bool *have_higher_than_11mbit,
2257                                 int *min_rate, int *min_rate_index,
2258                                 int shift, u32 rate_flags)
2259 {
2260         int i, j;
2261
2262         for (i = 0; i < supp_rates_len; i++) {
2263                 int rate = supp_rates[i] & 0x7f;
2264                 bool is_basic = !!(supp_rates[i] & 0x80);
2265
2266                 if ((rate * 5 * (1 << shift)) > 110)
2267                         *have_higher_than_11mbit = true;
2268
2269                 /*
2270                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2271                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2272                  *
2273                  * Note: Even through the membership selector and the basic
2274                  *       rate flag share the same bit, they are not exactly
2275                  *       the same.
2276                  */
2277                 if (!!(supp_rates[i] & 0x80) &&
2278                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2279                         continue;
2280
2281                 for (j = 0; j < sband->n_bitrates; j++) {
2282                         struct ieee80211_rate *br;
2283                         int brate;
2284
2285                         br = &sband->bitrates[j];
2286                         if ((rate_flags & br->flags) != rate_flags)
2287                                 continue;
2288
2289                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2290                         if (brate == rate) {
2291                                 *rates |= BIT(j);
2292                                 if (is_basic)
2293                                         *basic_rates |= BIT(j);
2294                                 if ((rate * 5) < *min_rate) {
2295                                         *min_rate = rate * 5;
2296                                         *min_rate_index = j;
2297                                 }
2298                                 break;
2299                         }
2300                 }
2301         }
2302 }
2303
2304 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2305                                          bool assoc)
2306 {
2307         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2308
2309         sdata_assert_lock(sdata);
2310
2311         if (!assoc) {
2312                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2313
2314                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2315                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2316                 sdata->u.mgd.flags = 0;
2317                 ieee80211_vif_release_channel(sdata);
2318         }
2319
2320         kfree(assoc_data);
2321         sdata->u.mgd.assoc_data = NULL;
2322 }
2323
2324 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2325                                     struct cfg80211_bss *cbss,
2326                                     struct ieee80211_mgmt *mgmt, size_t len)
2327 {
2328         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2329         struct ieee80211_local *local = sdata->local;
2330         struct ieee80211_supported_band *sband;
2331         struct sta_info *sta;
2332         u8 *pos;
2333         u16 capab_info, aid;
2334         struct ieee802_11_elems elems;
2335         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2336         const struct cfg80211_bss_ies *bss_ies = NULL;
2337         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2338         u32 changed = 0;
2339         int err;
2340         bool ret;
2341
2342         /* AssocResp and ReassocResp have identical structure */
2343
2344         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2345         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2346
2347         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2348                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2349                            aid);
2350         aid &= ~(BIT(15) | BIT(14));
2351
2352         ifmgd->broken_ap = false;
2353
2354         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2355                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2356                            aid);
2357                 aid = 0;
2358                 ifmgd->broken_ap = true;
2359         }
2360
2361         pos = mgmt->u.assoc_resp.variable;
2362         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2363
2364         if (!elems.supp_rates) {
2365                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2366                 return false;
2367         }
2368
2369         ifmgd->aid = aid;
2370
2371         /*
2372          * Some APs are erroneously not including some information in their
2373          * (re)association response frames. Try to recover by using the data
2374          * from the beacon or probe response. This seems to afflict mobile
2375          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2376          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2377          */
2378         if ((assoc_data->wmm && !elems.wmm_param) ||
2379             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2380              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2381             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2382              (!elems.vht_cap_elem || !elems.vht_operation))) {
2383                 const struct cfg80211_bss_ies *ies;
2384                 struct ieee802_11_elems bss_elems;
2385
2386                 rcu_read_lock();
2387                 ies = rcu_dereference(cbss->ies);
2388                 if (ies)
2389                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2390                                           GFP_ATOMIC);
2391                 rcu_read_unlock();
2392                 if (!bss_ies)
2393                         return false;
2394
2395                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2396                                        false, &bss_elems);
2397                 if (assoc_data->wmm &&
2398                     !elems.wmm_param && bss_elems.wmm_param) {
2399                         elems.wmm_param = bss_elems.wmm_param;
2400                         sdata_info(sdata,
2401                                    "AP bug: WMM param missing from AssocResp\n");
2402                 }
2403
2404                 /*
2405                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2406                  * have to include the IEs in the (re)association response.
2407                  */
2408                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2409                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2410                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2411                         sdata_info(sdata,
2412                                    "AP bug: HT capability missing from AssocResp\n");
2413                 }
2414                 if (!elems.ht_operation && bss_elems.ht_operation &&
2415                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2416                         elems.ht_operation = bss_elems.ht_operation;
2417                         sdata_info(sdata,
2418                                    "AP bug: HT operation missing from AssocResp\n");
2419                 }
2420                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2421                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2422                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2423                         sdata_info(sdata,
2424                                    "AP bug: VHT capa missing from AssocResp\n");
2425                 }
2426                 if (!elems.vht_operation && bss_elems.vht_operation &&
2427                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2428                         elems.vht_operation = bss_elems.vht_operation;
2429                         sdata_info(sdata,
2430                                    "AP bug: VHT operation missing from AssocResp\n");
2431                 }
2432         }
2433
2434         /*
2435          * We previously checked these in the beacon/probe response, so
2436          * they should be present here. This is just a safety net.
2437          */
2438         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2439             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2440                 sdata_info(sdata,
2441                            "HT AP is missing WMM params or HT capability/operation\n");
2442                 ret = false;
2443                 goto out;
2444         }
2445
2446         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2447             (!elems.vht_cap_elem || !elems.vht_operation)) {
2448                 sdata_info(sdata,
2449                            "VHT AP is missing VHT capability/operation\n");
2450                 ret = false;
2451                 goto out;
2452         }
2453
2454         mutex_lock(&sdata->local->sta_mtx);
2455         /*
2456          * station info was already allocated and inserted before
2457          * the association and should be available to us
2458          */
2459         sta = sta_info_get(sdata, cbss->bssid);
2460         if (WARN_ON(!sta)) {
2461                 mutex_unlock(&sdata->local->sta_mtx);
2462                 ret = false;
2463                 goto out;
2464         }
2465
2466         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2467
2468         /* Set up internal HT/VHT capabilities */
2469         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2470                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2471                                                   elems.ht_cap_elem, sta);
2472
2473         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2474                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2475                                                     elems.vht_cap_elem, sta);
2476
2477         /*
2478          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2479          * in their association response, so ignore that data for our own
2480          * configuration. If it changed since the last beacon, we'll get the
2481          * next beacon and update then.
2482          */
2483
2484         /*
2485          * If an operating mode notification IE is present, override the
2486          * NSS calculation (that would be done in rate_control_rate_init())
2487          * and use the # of streams from that element.
2488          */
2489         if (elems.opmode_notif &&
2490             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2491                 u8 nss;
2492
2493                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2494                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2495                 nss += 1;
2496                 sta->sta.rx_nss = nss;
2497         }
2498
2499         rate_control_rate_init(sta);
2500
2501         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2502                 set_sta_flag(sta, WLAN_STA_MFP);
2503
2504         if (elems.wmm_param)
2505                 set_sta_flag(sta, WLAN_STA_WME);
2506
2507         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2508         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2509                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2510         if (err) {
2511                 sdata_info(sdata,
2512                            "failed to move station %pM to desired state\n",
2513                            sta->sta.addr);
2514                 WARN_ON(__sta_info_destroy(sta));
2515                 mutex_unlock(&sdata->local->sta_mtx);
2516                 ret = false;
2517                 goto out;
2518         }
2519
2520         mutex_unlock(&sdata->local->sta_mtx);
2521
2522         /*
2523          * Always handle WMM once after association regardless
2524          * of the first value the AP uses. Setting -1 here has
2525          * that effect because the AP values is an unsigned
2526          * 4-bit value.
2527          */
2528         ifmgd->wmm_last_param_set = -1;
2529
2530         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2531                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2532                                          elems.wmm_param_len);
2533         else
2534                 ieee80211_set_wmm_default(sdata, false);
2535         changed |= BSS_CHANGED_QOS;
2536
2537         /* set AID and assoc capability,
2538          * ieee80211_set_associated() will tell the driver */
2539         bss_conf->aid = aid;
2540         bss_conf->assoc_capability = capab_info;
2541         ieee80211_set_associated(sdata, cbss, changed);
2542
2543         /*
2544          * If we're using 4-addr mode, let the AP know that we're
2545          * doing so, so that it can create the STA VLAN on its side
2546          */
2547         if (ifmgd->use_4addr)
2548                 ieee80211_send_4addr_nullfunc(local, sdata);
2549
2550         /*
2551          * Start timer to probe the connection to the AP now.
2552          * Also start the timer that will detect beacon loss.
2553          */
2554         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2555         ieee80211_sta_reset_beacon_monitor(sdata);
2556
2557         ret = true;
2558  out:
2559         kfree(bss_ies);
2560         return ret;
2561 }
2562
2563 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2564                                          struct ieee80211_mgmt *mgmt,
2565                                          size_t len)
2566 {
2567         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2568         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2569         u16 capab_info, status_code, aid;
2570         struct ieee802_11_elems elems;
2571         u8 *pos;
2572         bool reassoc;
2573         struct cfg80211_bss *bss;
2574
2575         sdata_assert_lock(sdata);
2576
2577         if (!assoc_data)
2578                 return;
2579         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2580                 return;
2581
2582         /*
2583          * AssocResp and ReassocResp have identical structure, so process both
2584          * of them in this function.
2585          */
2586
2587         if (len < 24 + 6)
2588                 return;
2589
2590         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2591         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2592         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2593         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2594
2595         sdata_info(sdata,
2596                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2597                    reassoc ? "Rea" : "A", mgmt->sa,
2598                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2599
2600         pos = mgmt->u.assoc_resp.variable;
2601         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2602
2603         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2604             elems.timeout_int &&
2605             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2606                 u32 tu, ms;
2607                 tu = le32_to_cpu(elems.timeout_int->value);
2608                 ms = tu * 1024 / 1000;
2609                 sdata_info(sdata,
2610                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2611                            mgmt->sa, tu, ms);
2612                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2613                 assoc_data->timeout_started = true;
2614                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2615                         run_again(sdata, assoc_data->timeout);
2616                 return;
2617         }
2618
2619         bss = assoc_data->bss;
2620
2621         if (status_code != WLAN_STATUS_SUCCESS) {
2622                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2623                            mgmt->sa, status_code);
2624                 ieee80211_destroy_assoc_data(sdata, false);
2625         } else {
2626                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2627                         /* oops -- internal error -- send timeout for now */
2628                         ieee80211_destroy_assoc_data(sdata, false);
2629                         cfg80211_assoc_timeout(sdata->dev, bss);
2630                         return;
2631                 }
2632                 sdata_info(sdata, "associated\n");
2633
2634                 /*
2635                  * destroy assoc_data afterwards, as otherwise an idle
2636                  * recalc after assoc_data is NULL but before associated
2637                  * is set can cause the interface to go idle
2638                  */
2639                 ieee80211_destroy_assoc_data(sdata, true);
2640         }
2641
2642         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
2643 }
2644
2645 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2646                                   struct ieee80211_mgmt *mgmt, size_t len,
2647                                   struct ieee80211_rx_status *rx_status,
2648                                   struct ieee802_11_elems *elems)
2649 {
2650         struct ieee80211_local *local = sdata->local;
2651         int freq;
2652         struct ieee80211_bss *bss;
2653         struct ieee80211_channel *channel;
2654
2655         sdata_assert_lock(sdata);
2656
2657         if (elems->ds_params)
2658                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2659                                                       rx_status->band);
2660         else
2661                 freq = rx_status->freq;
2662
2663         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2664
2665         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2666                 return;
2667
2668         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2669                                         channel);
2670         if (bss) {
2671                 ieee80211_rx_bss_put(local, bss);
2672                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2673         }
2674 }
2675
2676
2677 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2678                                          struct sk_buff *skb)
2679 {
2680         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2681         struct ieee80211_if_managed *ifmgd;
2682         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2683         size_t baselen, len = skb->len;
2684         struct ieee802_11_elems elems;
2685
2686         ifmgd = &sdata->u.mgd;
2687
2688         sdata_assert_lock(sdata);
2689
2690         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2691                 return; /* ignore ProbeResp to foreign address */
2692
2693         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2694         if (baselen > len)
2695                 return;
2696
2697         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2698                                false, &elems);
2699
2700         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2701
2702         if (ifmgd->associated &&
2703             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2704                 ieee80211_reset_ap_probe(sdata);
2705
2706         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2707             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2708                 /* got probe response, continue with auth */
2709                 sdata_info(sdata, "direct probe responded\n");
2710                 ifmgd->auth_data->tries = 0;
2711                 ifmgd->auth_data->timeout = jiffies;
2712                 ifmgd->auth_data->timeout_started = true;
2713                 run_again(sdata, ifmgd->auth_data->timeout);
2714         }
2715 }
2716
2717 /*
2718  * This is the canonical list of information elements we care about,
2719  * the filter code also gives us all changes to the Microsoft OUI
2720  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2721  *
2722  * We implement beacon filtering in software since that means we can
2723  * avoid processing the frame here and in cfg80211, and userspace
2724  * will not be able to tell whether the hardware supports it or not.
2725  *
2726  * XXX: This list needs to be dynamic -- userspace needs to be able to
2727  *      add items it requires. It also needs to be able to tell us to
2728  *      look out for other vendor IEs.
2729  */
2730 static const u64 care_about_ies =
2731         (1ULL << WLAN_EID_COUNTRY) |
2732         (1ULL << WLAN_EID_ERP_INFO) |
2733         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2734         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2735         (1ULL << WLAN_EID_HT_CAPABILITY) |
2736         (1ULL << WLAN_EID_HT_OPERATION);
2737
2738 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2739                                      struct ieee80211_mgmt *mgmt, size_t len,
2740                                      struct ieee80211_rx_status *rx_status)
2741 {
2742         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2743         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2744         size_t baselen;
2745         struct ieee802_11_elems elems;
2746         struct ieee80211_local *local = sdata->local;
2747         struct ieee80211_chanctx_conf *chanctx_conf;
2748         struct ieee80211_channel *chan;
2749         struct sta_info *sta;
2750         u32 changed = 0;
2751         bool erp_valid;
2752         u8 erp_value = 0;
2753         u32 ncrc;
2754         u8 *bssid;
2755         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2756
2757         sdata_assert_lock(sdata);
2758
2759         /* Process beacon from the current BSS */
2760         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2761         if (baselen > len)
2762                 return;
2763
2764         rcu_read_lock();
2765         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2766         if (!chanctx_conf) {
2767                 rcu_read_unlock();
2768                 return;
2769         }
2770
2771         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2772                 rcu_read_unlock();
2773                 return;
2774         }
2775         chan = chanctx_conf->def.chan;
2776         rcu_read_unlock();
2777
2778         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2779             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2780                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2781                                        len - baselen, false, &elems);
2782
2783                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2784                 if (elems.tim && !elems.parse_error) {
2785                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
2786                         ifmgd->dtim_period = tim_ie->dtim_period;
2787                 }
2788                 ifmgd->have_beacon = true;
2789                 ifmgd->assoc_data->need_beacon = false;
2790                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2791                         sdata->vif.bss_conf.sync_tsf =
2792                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2793                         sdata->vif.bss_conf.sync_device_ts =
2794                                 rx_status->device_timestamp;
2795                         if (elems.tim)
2796                                 sdata->vif.bss_conf.sync_dtim_count =
2797                                         elems.tim->dtim_count;
2798                         else
2799                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2800                 }
2801                 /* continue assoc process */
2802                 ifmgd->assoc_data->timeout = jiffies;
2803                 ifmgd->assoc_data->timeout_started = true;
2804                 run_again(sdata, ifmgd->assoc_data->timeout);
2805                 return;
2806         }
2807
2808         if (!ifmgd->associated ||
2809             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2810                 return;
2811         bssid = ifmgd->associated->bssid;
2812
2813         /* Track average RSSI from the Beacon frames of the current AP */
2814         ifmgd->last_beacon_signal = rx_status->signal;
2815         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2816                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2817                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2818                 ifmgd->last_cqm_event_signal = 0;
2819                 ifmgd->count_beacon_signal = 1;
2820                 ifmgd->last_ave_beacon_signal = 0;
2821         } else {
2822                 ifmgd->ave_beacon_signal =
2823                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2824                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2825                          ifmgd->ave_beacon_signal) / 16;
2826                 ifmgd->count_beacon_signal++;
2827         }
2828
2829         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2830             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2831                 int sig = ifmgd->ave_beacon_signal;
2832                 int last_sig = ifmgd->last_ave_beacon_signal;
2833
2834                 /*
2835                  * if signal crosses either of the boundaries, invoke callback
2836                  * with appropriate parameters
2837                  */
2838                 if (sig > ifmgd->rssi_max_thold &&
2839                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2840                         ifmgd->last_ave_beacon_signal = sig;
2841                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2842                 } else if (sig < ifmgd->rssi_min_thold &&
2843                            (last_sig >= ifmgd->rssi_max_thold ||
2844                            last_sig == 0)) {
2845                         ifmgd->last_ave_beacon_signal = sig;
2846                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2847                 }
2848         }
2849
2850         if (bss_conf->cqm_rssi_thold &&
2851             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2852             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2853                 int sig = ifmgd->ave_beacon_signal / 16;
2854                 int last_event = ifmgd->last_cqm_event_signal;
2855                 int thold = bss_conf->cqm_rssi_thold;
2856                 int hyst = bss_conf->cqm_rssi_hyst;
2857                 if (sig < thold &&
2858                     (last_event == 0 || sig < last_event - hyst)) {
2859                         ifmgd->last_cqm_event_signal = sig;
2860                         ieee80211_cqm_rssi_notify(
2861                                 &sdata->vif,
2862                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2863                                 GFP_KERNEL);
2864                 } else if (sig > thold &&
2865                            (last_event == 0 || sig > last_event + hyst)) {
2866                         ifmgd->last_cqm_event_signal = sig;
2867                         ieee80211_cqm_rssi_notify(
2868                                 &sdata->vif,
2869                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2870                                 GFP_KERNEL);
2871                 }
2872         }
2873
2874         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
2875                 mlme_dbg_ratelimited(sdata,
2876                                      "cancelling AP probe due to a received beacon\n");
2877                 ieee80211_reset_ap_probe(sdata);
2878         }
2879
2880         /*
2881          * Push the beacon loss detection into the future since
2882          * we are processing a beacon from the AP just now.
2883          */
2884         ieee80211_sta_reset_beacon_monitor(sdata);
2885
2886         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2887         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2888                                           len - baselen, false, &elems,
2889                                           care_about_ies, ncrc);
2890
2891         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2892                 bool directed_tim = ieee80211_check_tim(elems.tim,
2893                                                         elems.tim_len,
2894                                                         ifmgd->aid);
2895                 if (directed_tim) {
2896                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2897                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2898                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2899                                         ieee80211_hw_config(local,
2900                                                             IEEE80211_CONF_CHANGE_PS);
2901                                 }
2902                                 ieee80211_send_nullfunc(local, sdata, 0);
2903                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2904                                 local->pspolling = true;
2905
2906                                 /*
2907                                  * Here is assumed that the driver will be
2908                                  * able to send ps-poll frame and receive a
2909                                  * response even though power save mode is
2910                                  * enabled, but some drivers might require
2911                                  * to disable power save here. This needs
2912                                  * to be investigated.
2913                                  */
2914                                 ieee80211_send_pspoll(local, sdata);
2915                         }
2916                 }
2917         }
2918
2919         if (sdata->vif.p2p) {
2920                 struct ieee80211_p2p_noa_attr noa = {};
2921                 int ret;
2922
2923                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
2924                                             len - baselen,
2925                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2926                                             (u8 *) &noa, sizeof(noa));
2927                 if (ret >= 2) {
2928                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
2929                                 /* valid noa_attr and index changed */
2930                                 sdata->u.mgd.p2p_noa_index = noa.index;
2931                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
2932                                 changed |= BSS_CHANGED_P2P_PS;
2933                                 /*
2934                                  * make sure we update all information, the CRC
2935                                  * mechanism doesn't look at P2P attributes.
2936                                  */
2937                                 ifmgd->beacon_crc_valid = false;
2938                         }
2939                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
2940                         /* noa_attr not found and we had valid noa_attr before */
2941                         sdata->u.mgd.p2p_noa_index = -1;
2942                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
2943                         changed |= BSS_CHANGED_P2P_PS;
2944                         ifmgd->beacon_crc_valid = false;
2945                 }
2946         }
2947
2948         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2949                 return;
2950         ifmgd->beacon_crc = ncrc;
2951         ifmgd->beacon_crc_valid = true;
2952
2953         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2954
2955         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
2956                                          &elems, true);
2957
2958         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
2959             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2960                                      elems.wmm_param_len))
2961                 changed |= BSS_CHANGED_QOS;
2962
2963         /*
2964          * If we haven't had a beacon before, tell the driver about the
2965          * DTIM period (and beacon timing if desired) now.
2966          */
2967         if (!ifmgd->have_beacon) {
2968                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
2969                 if (elems.tim)
2970                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
2971                 else
2972                         bss_conf->dtim_period = 1;
2973
2974                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2975                         sdata->vif.bss_conf.sync_tsf =
2976                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2977                         sdata->vif.bss_conf.sync_device_ts =
2978                                 rx_status->device_timestamp;
2979                         if (elems.tim)
2980                                 sdata->vif.bss_conf.sync_dtim_count =
2981                                         elems.tim->dtim_count;
2982                         else
2983                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2984                 }
2985
2986                 changed |= BSS_CHANGED_BEACON_INFO;
2987                 ifmgd->have_beacon = true;
2988
2989                 mutex_lock(&local->iflist_mtx);
2990                 ieee80211_recalc_ps(local, -1);
2991                 mutex_unlock(&local->iflist_mtx);
2992
2993                 ieee80211_recalc_ps_vif(sdata);
2994         }
2995
2996         if (elems.erp_info) {
2997                 erp_valid = true;
2998                 erp_value = elems.erp_info[0];
2999         } else {
3000                 erp_valid = false;
3001         }
3002         changed |= ieee80211_handle_bss_capability(sdata,
3003                         le16_to_cpu(mgmt->u.beacon.capab_info),
3004                         erp_valid, erp_value);
3005
3006         mutex_lock(&local->sta_mtx);
3007         sta = sta_info_get(sdata, bssid);
3008
3009         if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3010                                 elems.vht_operation, bssid, &changed)) {
3011                 mutex_unlock(&local->sta_mtx);
3012                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3013                                        WLAN_REASON_DEAUTH_LEAVING,
3014                                        true, deauth_buf);
3015                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3016                                       sizeof(deauth_buf));
3017                 return;
3018         }
3019
3020         if (sta && elems.opmode_notif)
3021                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3022                                             rx_status->band, true);
3023         mutex_unlock(&local->sta_mtx);
3024
3025         if (elems.country_elem && elems.pwr_constr_elem &&
3026             mgmt->u.probe_resp.capab_info &
3027                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3028                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3029                                                        elems.country_elem,
3030                                                        elems.country_elem_len,
3031                                                        elems.pwr_constr_elem);
3032
3033         ieee80211_bss_info_change_notify(sdata, changed);
3034 }
3035
3036 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3037                                   struct sk_buff *skb)
3038 {
3039         struct ieee80211_rx_status *rx_status;
3040         struct ieee80211_mgmt *mgmt;
3041         u16 fc;
3042         struct ieee802_11_elems elems;
3043         int ies_len;
3044
3045         rx_status = (struct ieee80211_rx_status *) skb->cb;
3046         mgmt = (struct ieee80211_mgmt *) skb->data;
3047         fc = le16_to_cpu(mgmt->frame_control);
3048
3049         sdata_lock(sdata);
3050
3051         switch (fc & IEEE80211_FCTL_STYPE) {
3052         case IEEE80211_STYPE_BEACON:
3053                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3054                 break;
3055         case IEEE80211_STYPE_PROBE_RESP:
3056                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3057                 break;
3058         case IEEE80211_STYPE_AUTH:
3059                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3060                 break;
3061         case IEEE80211_STYPE_DEAUTH:
3062                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3063                 break;
3064         case IEEE80211_STYPE_DISASSOC:
3065                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3066                 break;
3067         case IEEE80211_STYPE_ASSOC_RESP:
3068         case IEEE80211_STYPE_REASSOC_RESP:
3069                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3070                 break;
3071         case IEEE80211_STYPE_ACTION:
3072                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3073                         ies_len = skb->len -
3074                                   offsetof(struct ieee80211_mgmt,
3075                                            u.action.u.chan_switch.variable);
3076
3077                         if (ies_len < 0)
3078                                 break;
3079
3080                         ieee802_11_parse_elems(
3081                                 mgmt->u.action.u.chan_switch.variable,
3082                                 ies_len, true, &elems);
3083
3084                         if (elems.parse_error)
3085                                 break;
3086
3087                         ieee80211_sta_process_chanswitch(sdata,
3088                                                          rx_status->mactime,
3089                                                          &elems, false);
3090                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3091                         ies_len = skb->len -
3092                                   offsetof(struct ieee80211_mgmt,
3093                                            u.action.u.ext_chan_switch.variable);
3094
3095                         if (ies_len < 0)
3096                                 break;
3097
3098                         ieee802_11_parse_elems(
3099                                 mgmt->u.action.u.ext_chan_switch.variable,
3100                                 ies_len, true, &elems);
3101
3102                         if (elems.parse_error)
3103                                 break;
3104
3105                         /* for the handling code pretend this was also an IE */
3106                         elems.ext_chansw_ie =
3107                                 &mgmt->u.action.u.ext_chan_switch.data;
3108
3109                         ieee80211_sta_process_chanswitch(sdata,
3110                                                          rx_status->mactime,
3111                                                          &elems, false);
3112                 }
3113                 break;
3114         }
3115         sdata_unlock(sdata);
3116 }
3117
3118 static void ieee80211_sta_timer(unsigned long data)
3119 {
3120         struct ieee80211_sub_if_data *sdata =
3121                 (struct ieee80211_sub_if_data *) data;
3122
3123         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3124 }
3125
3126 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3127                                           u8 *bssid, u8 reason, bool tx)
3128 {
3129         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3130
3131         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3132                                tx, frame_buf);
3133
3134         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3135                               IEEE80211_DEAUTH_FRAME_LEN);
3136 }
3137
3138 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3139 {
3140         struct ieee80211_local *local = sdata->local;
3141         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3142         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3143         u32 tx_flags = 0;
3144
3145         sdata_assert_lock(sdata);
3146
3147         if (WARN_ON_ONCE(!auth_data))
3148                 return -EINVAL;
3149
3150         auth_data->tries++;
3151
3152         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3153                 sdata_info(sdata, "authentication with %pM timed out\n",
3154                            auth_data->bss->bssid);
3155
3156                 /*
3157                  * Most likely AP is not in the range so remove the
3158                  * bss struct for that AP.
3159                  */
3160                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3161
3162                 return -ETIMEDOUT;
3163         }
3164
3165         drv_mgd_prepare_tx(local, sdata);
3166
3167         if (auth_data->bss->proberesp_ies) {
3168                 u16 trans = 1;
3169                 u16 status = 0;
3170
3171                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3172                            auth_data->bss->bssid, auth_data->tries,
3173                            IEEE80211_AUTH_MAX_TRIES);
3174
3175                 auth_data->expected_transaction = 2;
3176
3177                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3178                         trans = auth_data->sae_trans;
3179                         status = auth_data->sae_status;
3180                         auth_data->expected_transaction = trans;
3181                 }
3182
3183                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3184                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3185                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3186
3187                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3188                                     auth_data->data, auth_data->data_len,
3189                                     auth_data->bss->bssid,
3190                                     auth_data->bss->bssid, NULL, 0, 0,
3191                                     tx_flags);
3192         } else {
3193                 const u8 *ssidie;
3194
3195                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3196                            auth_data->bss->bssid, auth_data->tries,
3197                            IEEE80211_AUTH_MAX_TRIES);
3198
3199                 rcu_read_lock();
3200                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3201                 if (!ssidie) {
3202                         rcu_read_unlock();
3203                         return -EINVAL;
3204                 }
3205                 /*
3206                  * Direct probe is sent to broadcast address as some APs
3207                  * will not answer to direct packet in unassociated state.
3208                  */
3209                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3210                                          NULL, 0, (u32) -1, true, 0,
3211                                          auth_data->bss->channel, false);
3212                 rcu_read_unlock();
3213         }
3214
3215         if (tx_flags == 0) {
3216                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3217                 auth_data->timeout_started = true;
3218                 run_again(sdata, auth_data->timeout);
3219         } else {
3220                 auth_data->timeout =
3221                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3222                 auth_data->timeout_started = true;
3223                 run_again(sdata, auth_data->timeout);
3224         }
3225
3226         return 0;
3227 }
3228
3229 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3230 {
3231         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3232         struct ieee80211_local *local = sdata->local;
3233
3234         sdata_assert_lock(sdata);
3235
3236         assoc_data->tries++;
3237         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3238                 sdata_info(sdata, "association with %pM timed out\n",
3239                            assoc_data->bss->bssid);
3240
3241                 /*
3242                  * Most likely AP is not in the range so remove the
3243                  * bss struct for that AP.
3244                  */
3245                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3246
3247                 return -ETIMEDOUT;
3248         }
3249
3250         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3251                    assoc_data->bss->bssid, assoc_data->tries,
3252                    IEEE80211_ASSOC_MAX_TRIES);
3253         ieee80211_send_assoc(sdata);
3254
3255         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3256                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3257                 assoc_data->timeout_started = true;
3258                 run_again(sdata, assoc_data->timeout);
3259         } else {
3260                 assoc_data->timeout =
3261                         round_jiffies_up(jiffies +
3262                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3263                 assoc_data->timeout_started = true;
3264                 run_again(sdata, assoc_data->timeout);
3265         }
3266
3267         return 0;
3268 }
3269
3270 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3271                                   __le16 fc, bool acked)
3272 {
3273         struct ieee80211_local *local = sdata->local;
3274
3275         sdata->u.mgd.status_fc = fc;
3276         sdata->u.mgd.status_acked = acked;
3277         sdata->u.mgd.status_received = true;
3278
3279         ieee80211_queue_work(&local->hw, &sdata->work);
3280 }
3281
3282 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3283 {
3284         struct ieee80211_local *local = sdata->local;
3285         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3286
3287         sdata_lock(sdata);
3288
3289         if (ifmgd->status_received) {
3290                 __le16 fc = ifmgd->status_fc;
3291                 bool status_acked = ifmgd->status_acked;
3292
3293                 ifmgd->status_received = false;
3294                 if (ifmgd->auth_data &&
3295                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3296                         if (status_acked) {
3297                                 ifmgd->auth_data->timeout =
3298                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3299                                 run_again(sdata, ifmgd->auth_data->timeout);
3300                         } else {
3301                                 ifmgd->auth_data->timeout = jiffies - 1;
3302                         }
3303                         ifmgd->auth_data->timeout_started = true;
3304                 } else if (ifmgd->assoc_data &&
3305                            (ieee80211_is_assoc_req(fc) ||
3306                             ieee80211_is_reassoc_req(fc))) {
3307                         if (status_acked) {
3308                                 ifmgd->assoc_data->timeout =
3309                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3310                                 run_again(sdata, ifmgd->assoc_data->timeout);
3311                         } else {
3312                                 ifmgd->assoc_data->timeout = jiffies - 1;
3313                         }
3314                         ifmgd->assoc_data->timeout_started = true;
3315                 }
3316         }
3317
3318         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3319             time_after(jiffies, ifmgd->auth_data->timeout)) {
3320                 if (ifmgd->auth_data->done) {
3321                         /*
3322                          * ok ... we waited for assoc but userspace didn't,
3323                          * so let's just kill the auth data
3324                          */
3325                         ieee80211_destroy_auth_data(sdata, false);
3326                 } else if (ieee80211_probe_auth(sdata)) {
3327                         u8 bssid[ETH_ALEN];
3328
3329                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3330
3331                         ieee80211_destroy_auth_data(sdata, false);
3332
3333                         cfg80211_auth_timeout(sdata->dev, bssid);
3334                 }
3335         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3336                 run_again(sdata, ifmgd->auth_data->timeout);
3337
3338         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3339             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3340                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3341                     ieee80211_do_assoc(sdata)) {
3342                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3343
3344                         ieee80211_destroy_assoc_data(sdata, false);
3345                         cfg80211_assoc_timeout(sdata->dev, bss);
3346                 }
3347         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3348                 run_again(sdata, ifmgd->assoc_data->timeout);
3349
3350         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3351             ifmgd->associated) {
3352                 u8 bssid[ETH_ALEN];
3353                 int max_tries;
3354
3355                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3356
3357                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3358                         max_tries = max_nullfunc_tries;
3359                 else
3360                         max_tries = max_probe_tries;
3361
3362                 /* ACK received for nullfunc probing frame */
3363                 if (!ifmgd->probe_send_count)
3364                         ieee80211_reset_ap_probe(sdata);
3365                 else if (ifmgd->nullfunc_failed) {
3366                         if (ifmgd->probe_send_count < max_tries) {
3367                                 mlme_dbg(sdata,
3368                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3369                                          bssid, ifmgd->probe_send_count,
3370                                          max_tries);
3371                                 ieee80211_mgd_probe_ap_send(sdata);
3372                         } else {
3373                                 mlme_dbg(sdata,
3374                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3375                                          bssid);
3376                                 ieee80211_sta_connection_lost(sdata, bssid,
3377                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3378                                         false);
3379                         }
3380                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3381                         run_again(sdata, ifmgd->probe_timeout);
3382                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3383                         mlme_dbg(sdata,
3384                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3385                                  bssid, probe_wait_ms);
3386                         ieee80211_sta_connection_lost(sdata, bssid,
3387                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3388                 } else if (ifmgd->probe_send_count < max_tries) {
3389                         mlme_dbg(sdata,
3390                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3391                                  bssid, probe_wait_ms,
3392                                  ifmgd->probe_send_count, max_tries);
3393                         ieee80211_mgd_probe_ap_send(sdata);
3394                 } else {
3395                         /*
3396                          * We actually lost the connection ... or did we?
3397                          * Let's make sure!
3398                          */
3399                         wiphy_debug(local->hw.wiphy,
3400                                     "%s: No probe response from AP %pM"
3401                                     " after %dms, disconnecting.\n",
3402                                     sdata->name,
3403                                     bssid, probe_wait_ms);
3404
3405                         ieee80211_sta_connection_lost(sdata, bssid,
3406                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3407                 }
3408         }
3409
3410         sdata_unlock(sdata);
3411 }
3412
3413 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3414 {
3415         struct ieee80211_sub_if_data *sdata =
3416                 (struct ieee80211_sub_if_data *) data;
3417         struct ieee80211_local *local = sdata->local;
3418
3419         if (local->quiescing)
3420                 return;
3421
3422         sdata->u.mgd.connection_loss = false;
3423         ieee80211_queue_work(&sdata->local->hw,
3424                              &sdata->u.mgd.beacon_connection_loss_work);
3425 }
3426
3427 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3428 {
3429         struct ieee80211_sub_if_data *sdata =
3430                 (struct ieee80211_sub_if_data *) data;
3431         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3432         struct ieee80211_local *local = sdata->local;
3433
3434         if (local->quiescing)
3435                 return;
3436
3437         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3438 }
3439
3440 static void ieee80211_sta_monitor_work(struct work_struct *work)
3441 {
3442         struct ieee80211_sub_if_data *sdata =
3443                 container_of(work, struct ieee80211_sub_if_data,
3444                              u.mgd.monitor_work);
3445
3446         ieee80211_mgd_probe_ap(sdata, false);
3447 }
3448
3449 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3450 {
3451         u32 flags;
3452
3453         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3454                 __ieee80211_stop_poll(sdata);
3455
3456                 /* let's probe the connection once */
3457                 flags = sdata->local->hw.flags;
3458                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3459                         ieee80211_queue_work(&sdata->local->hw,
3460                                              &sdata->u.mgd.monitor_work);
3461                 /* and do all the other regular work too */
3462                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3463         }
3464 }
3465
3466 #ifdef CONFIG_PM
3467 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3468 {
3469         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3470
3471         sdata_lock(sdata);
3472         if (!ifmgd->associated) {
3473                 sdata_unlock(sdata);
3474                 return;
3475         }
3476
3477         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3478                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3479                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3480                 ieee80211_sta_connection_lost(sdata,
3481                                               ifmgd->associated->bssid,
3482                                               WLAN_REASON_UNSPECIFIED,
3483                                               true);
3484                 sdata_unlock(sdata);
3485                 return;
3486         }
3487         sdata_unlock(sdata);
3488 }
3489 #endif
3490
3491 /* interface setup */
3492 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3493 {
3494         struct ieee80211_if_managed *ifmgd;
3495
3496         ifmgd = &sdata->u.mgd;
3497         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3498         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3499         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3500                   ieee80211_beacon_connection_loss_work);
3501         INIT_WORK(&ifmgd->csa_connection_drop_work,
3502                   ieee80211_csa_connection_drop_work);
3503         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3504         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3505                     (unsigned long) sdata);
3506         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3507                     (unsigned long) sdata);
3508         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3509                     (unsigned long) sdata);
3510         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3511                     (unsigned long) sdata);
3512
3513         ifmgd->flags = 0;
3514         ifmgd->powersave = sdata->wdev.ps;
3515         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3516         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3517         ifmgd->p2p_noa_index = -1;
3518
3519         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3520                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3521         else
3522                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3523 }
3524
3525 /* scan finished notification */
3526 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3527 {
3528         struct ieee80211_sub_if_data *sdata;
3529
3530         /* Restart STA timers */
3531         rcu_read_lock();
3532         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3533                 if (ieee80211_sdata_running(sdata))
3534                         ieee80211_restart_sta_timer(sdata);
3535         }
3536         rcu_read_unlock();
3537 }
3538
3539 int ieee80211_max_network_latency(struct notifier_block *nb,
3540                                   unsigned long data, void *dummy)
3541 {
3542         s32 latency_usec = (s32) data;
3543         struct ieee80211_local *local =
3544                 container_of(nb, struct ieee80211_local,
3545                              network_latency_notifier);
3546
3547         mutex_lock(&local->iflist_mtx);
3548         ieee80211_recalc_ps(local, latency_usec);
3549         mutex_unlock(&local->iflist_mtx);
3550
3551         return 0;
3552 }
3553
3554 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3555                                      struct cfg80211_bss *cbss)
3556 {
3557         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3558         const u8 *ht_cap_ie, *vht_cap_ie;
3559         const struct ieee80211_ht_cap *ht_cap;
3560         const struct ieee80211_vht_cap *vht_cap;
3561         u8 chains = 1;
3562
3563         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3564                 return chains;
3565
3566         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3567         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3568                 ht_cap = (void *)(ht_cap_ie + 2);
3569                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3570                 /*
3571                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3572                  *       "Tx Unequal Modulation Supported" fields.
3573                  */
3574         }
3575
3576         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3577                 return chains;
3578
3579         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3580         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3581                 u8 nss;
3582                 u16 tx_mcs_map;
3583
3584                 vht_cap = (void *)(vht_cap_ie + 2);
3585                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3586                 for (nss = 8; nss > 0; nss--) {
3587                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3588                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3589                                 break;
3590                 }
3591                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3592                 chains = max(chains, nss);
3593         }
3594
3595         return chains;
3596 }
3597
3598 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3599                                   struct cfg80211_bss *cbss)
3600 {
3601         struct ieee80211_local *local = sdata->local;
3602         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3603         const struct ieee80211_ht_operation *ht_oper = NULL;
3604         const struct ieee80211_vht_operation *vht_oper = NULL;
3605         struct ieee80211_supported_band *sband;
3606         struct cfg80211_chan_def chandef;
3607         int ret;
3608
3609         sband = local->hw.wiphy->bands[cbss->channel->band];
3610
3611         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3612                           IEEE80211_STA_DISABLE_80P80MHZ |
3613                           IEEE80211_STA_DISABLE_160MHZ);
3614
3615         rcu_read_lock();
3616
3617         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3618             sband->ht_cap.ht_supported) {
3619                 const u8 *ht_oper_ie, *ht_cap;
3620
3621                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3622                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3623                         ht_oper = (void *)(ht_oper_ie + 2);
3624
3625                 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3626                 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3627                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3628                         ht_oper = NULL;
3629                 }
3630         }
3631
3632         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3633             sband->vht_cap.vht_supported) {
3634                 const u8 *vht_oper_ie, *vht_cap;
3635
3636                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3637                                                    WLAN_EID_VHT_OPERATION);
3638                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3639                         vht_oper = (void *)(vht_oper_ie + 2);
3640                 if (vht_oper && !ht_oper) {
3641                         vht_oper = NULL;
3642                         sdata_info(sdata,
3643                                    "AP advertised VHT without HT, disabling both\n");
3644                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3645                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3646                 }
3647
3648                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3649                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3650                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3651                         vht_oper = NULL;
3652                 }
3653         }
3654
3655         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3656                                                      cbss->channel,
3657                                                      ht_oper, vht_oper,
3658                                                      &chandef, false);
3659
3660         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3661                                       local->rx_chains);
3662
3663         rcu_read_unlock();
3664
3665         /* will change later if needed */
3666         sdata->smps_mode = IEEE80211_SMPS_OFF;
3667
3668         /*
3669          * If this fails (possibly due to channel context sharing
3670          * on incompatible channels, e.g. 80+80 and 160 sharing the
3671          * same control channel) try to use a smaller bandwidth.
3672          */
3673         ret = ieee80211_vif_use_channel(sdata, &chandef,
3674                                         IEEE80211_CHANCTX_SHARED);
3675
3676         /* don't downgrade for 5 and 10 MHz channels, though. */
3677         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3678             chandef.width == NL80211_CHAN_WIDTH_10)
3679                 return ret;
3680
3681         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3682                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3683                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3684                                                 IEEE80211_CHANCTX_SHARED);
3685         }
3686         return ret;
3687 }
3688
3689 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3690                                      struct cfg80211_bss *cbss, bool assoc)
3691 {
3692         struct ieee80211_local *local = sdata->local;
3693         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3694         struct ieee80211_bss *bss = (void *)cbss->priv;
3695         struct sta_info *new_sta = NULL;
3696         bool have_sta = false;
3697         int err;
3698
3699         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3700                 return -EINVAL;
3701
3702         if (assoc) {
3703                 rcu_read_lock();
3704                 have_sta = sta_info_get(sdata, cbss->bssid);
3705                 rcu_read_unlock();
3706         }
3707
3708         if (!have_sta) {
3709                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3710                 if (!new_sta)
3711                         return -ENOMEM;
3712         }
3713         if (new_sta) {
3714                 u32 rates = 0, basic_rates = 0;
3715                 bool have_higher_than_11mbit;
3716                 int min_rate = INT_MAX, min_rate_index = -1;
3717                 struct ieee80211_chanctx_conf *chanctx_conf;
3718                 struct ieee80211_supported_band *sband;
3719                 const struct cfg80211_bss_ies *ies;
3720                 int shift;
3721                 u32 rate_flags;
3722
3723                 sband = local->hw.wiphy->bands[cbss->channel->band];
3724
3725                 err = ieee80211_prep_channel(sdata, cbss);
3726                 if (err) {
3727                         sta_info_free(local, new_sta);
3728                         return -EINVAL;
3729                 }
3730                 shift = ieee80211_vif_get_shift(&sdata->vif);
3731
3732                 rcu_read_lock();
3733                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3734                 if (WARN_ON(!chanctx_conf)) {
3735                         rcu_read_unlock();
3736                         return -EINVAL;
3737                 }
3738                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
3739                 rcu_read_unlock();
3740
3741                 ieee80211_get_rates(sband, bss->supp_rates,
3742                                     bss->supp_rates_len,
3743                                     &rates, &basic_rates,
3744                                     &have_higher_than_11mbit,
3745                                     &min_rate, &min_rate_index,
3746                                     shift, rate_flags);
3747
3748                 /*
3749                  * This used to be a workaround for basic rates missing
3750                  * in the association response frame. Now that we no
3751                  * longer use the basic rates from there, it probably
3752                  * doesn't happen any more, but keep the workaround so
3753                  * in case some *other* APs are buggy in different ways
3754                  * we can connect -- with a warning.
3755                  */
3756                 if (!basic_rates && min_rate_index >= 0) {
3757                         sdata_info(sdata,
3758                                    "No basic rates, using min rate instead\n");
3759                         basic_rates = BIT(min_rate_index);
3760                 }
3761
3762                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3763                 sdata->vif.bss_conf.basic_rates = basic_rates;
3764
3765                 /* cf. IEEE 802.11 9.2.12 */
3766                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3767                     have_higher_than_11mbit)
3768                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3769                 else
3770                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3771
3772                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3773
3774                 /* set timing information */
3775                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3776                 rcu_read_lock();
3777                 ies = rcu_dereference(cbss->beacon_ies);
3778                 if (ies) {
3779                         const u8 *tim_ie;
3780
3781                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3782                         sdata->vif.bss_conf.sync_device_ts =
3783                                 bss->device_ts_beacon;
3784                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3785                                                   ies->data, ies->len);
3786                         if (tim_ie && tim_ie[1] >= 2)
3787                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
3788                         else
3789                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3790                 } else if (!(local->hw.flags &
3791                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
3792                         ies = rcu_dereference(cbss->proberesp_ies);
3793                         /* must be non-NULL since beacon IEs were NULL */
3794                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3795                         sdata->vif.bss_conf.sync_device_ts =
3796                                 bss->device_ts_presp;
3797                         sdata->vif.bss_conf.sync_dtim_count = 0;
3798                 } else {
3799                         sdata->vif.bss_conf.sync_tsf = 0;
3800                         sdata->vif.bss_conf.sync_device_ts = 0;
3801                         sdata->vif.bss_conf.sync_dtim_count = 0;
3802                 }
3803                 rcu_read_unlock();
3804
3805                 /* tell driver about BSSID, basic rates and timing */
3806                 ieee80211_bss_info_change_notify(sdata,
3807                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3808                         BSS_CHANGED_BEACON_INT);
3809
3810                 if (assoc)
3811                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3812
3813                 err = sta_info_insert(new_sta);
3814                 new_sta = NULL;
3815                 if (err) {
3816                         sdata_info(sdata,
3817                                    "failed to insert STA entry for the AP (error %d)\n",
3818                                    err);
3819                         return err;
3820                 }
3821         } else
3822                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3823
3824         return 0;
3825 }
3826
3827 /* config hooks */
3828 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3829                        struct cfg80211_auth_request *req)
3830 {
3831         struct ieee80211_local *local = sdata->local;
3832         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3833         struct ieee80211_mgd_auth_data *auth_data;
3834         u16 auth_alg;
3835         int err;
3836
3837         /* prepare auth data structure */
3838
3839         switch (req->auth_type) {
3840         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3841                 auth_alg = WLAN_AUTH_OPEN;
3842                 break;
3843         case NL80211_AUTHTYPE_SHARED_KEY:
3844                 if (IS_ERR(local->wep_tx_tfm))
3845                         return -EOPNOTSUPP;
3846                 auth_alg = WLAN_AUTH_SHARED_KEY;
3847                 break;
3848         case NL80211_AUTHTYPE_FT:
3849                 auth_alg = WLAN_AUTH_FT;
3850                 break;
3851         case NL80211_AUTHTYPE_NETWORK_EAP:
3852                 auth_alg = WLAN_AUTH_LEAP;
3853                 break;
3854         case NL80211_AUTHTYPE_SAE:
3855                 auth_alg = WLAN_AUTH_SAE;
3856                 break;
3857         default:
3858                 return -EOPNOTSUPP;
3859         }
3860
3861         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3862                             req->ie_len, GFP_KERNEL);
3863         if (!auth_data)
3864                 return -ENOMEM;
3865
3866         auth_data->bss = req->bss;
3867
3868         if (req->sae_data_len >= 4) {
3869                 __le16 *pos = (__le16 *) req->sae_data;
3870                 auth_data->sae_trans = le16_to_cpu(pos[0]);
3871                 auth_data->sae_status = le16_to_cpu(pos[1]);
3872                 memcpy(auth_data->data, req->sae_data + 4,
3873                        req->sae_data_len - 4);
3874                 auth_data->data_len += req->sae_data_len - 4;
3875         }
3876
3877         if (req->ie && req->ie_len) {
3878                 memcpy(&auth_data->data[auth_data->data_len],
3879                        req->ie, req->ie_len);
3880                 auth_data->data_len += req->ie_len;
3881         }
3882
3883         if (req->key && req->key_len) {
3884                 auth_data->key_len = req->key_len;
3885                 auth_data->key_idx = req->key_idx;
3886                 memcpy(auth_data->key, req->key, req->key_len);
3887         }
3888
3889         auth_data->algorithm = auth_alg;
3890
3891         /* try to authenticate/probe */
3892
3893         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3894             ifmgd->assoc_data) {
3895                 err = -EBUSY;
3896                 goto err_free;
3897         }
3898
3899         if (ifmgd->auth_data)
3900                 ieee80211_destroy_auth_data(sdata, false);
3901
3902         /* prep auth_data so we don't go into idle on disassoc */
3903         ifmgd->auth_data = auth_data;
3904
3905         if (ifmgd->associated) {
3906                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3907
3908                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3909                                        WLAN_REASON_UNSPECIFIED,
3910                                        false, frame_buf);
3911
3912                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3913                                       sizeof(frame_buf));
3914         }
3915
3916         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3917
3918         err = ieee80211_prep_connection(sdata, req->bss, false);
3919         if (err)
3920                 goto err_clear;
3921
3922         err = ieee80211_probe_auth(sdata);
3923         if (err) {
3924                 sta_info_destroy_addr(sdata, req->bss->bssid);
3925                 goto err_clear;
3926         }
3927
3928         /* hold our own reference */
3929         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
3930         return 0;
3931
3932  err_clear:
3933         memset(ifmgd->bssid, 0, ETH_ALEN);
3934         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3935         ifmgd->auth_data = NULL;
3936  err_free:
3937         kfree(auth_data);
3938         return err;
3939 }
3940
3941 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
3942                                         const u8 *wmm_param, int len)
3943 {
3944         const u8 *pos;
3945         size_t left;
3946
3947         if (len < 8)
3948                 return false;
3949
3950         if (wmm_param[5] != 1 /* version */)
3951                 return false;
3952
3953         pos = wmm_param + 8;
3954         left = len - 8;
3955
3956         for (; left >= 4; left -= 4, pos += 4) {
3957                 u8 aifsn = pos[0] & 0x0f;
3958                 u8 ecwmin = pos[1] & 0x0f;
3959                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
3960                 int aci = (pos[0] >> 5) & 0x03;
3961
3962                 if (aifsn < 2) {
3963                         sdata_info(sdata,
3964                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
3965                                    aifsn, aci);
3966                         return false;
3967                 }
3968                 if (ecwmin > ecwmax) {
3969                         sdata_info(sdata,
3970                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
3971                                    ecwmin, ecwmax, aci);
3972                         return false;
3973                 }
3974         }
3975
3976         return true;
3977 }
3978
3979 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3980                         struct cfg80211_assoc_request *req)
3981 {
3982         struct ieee80211_local *local = sdata->local;
3983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3984         struct ieee80211_bss *bss = (void *)req->bss->priv;
3985         struct ieee80211_mgd_assoc_data *assoc_data;
3986         const struct cfg80211_bss_ies *beacon_ies;
3987         struct ieee80211_supported_band *sband;
3988         const u8 *ssidie, *ht_ie, *vht_ie;
3989         int i, err;
3990
3991         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3992         if (!assoc_data)
3993                 return -ENOMEM;
3994
3995         rcu_read_lock();
3996         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3997         if (!ssidie) {
3998                 rcu_read_unlock();
3999                 kfree(assoc_data);
4000                 return -EINVAL;
4001         }
4002         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4003         assoc_data->ssid_len = ssidie[1];
4004         rcu_read_unlock();
4005
4006         if (ifmgd->associated) {
4007                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4008
4009                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4010                                        WLAN_REASON_UNSPECIFIED,
4011                                        false, frame_buf);
4012
4013                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4014                                       sizeof(frame_buf));
4015         }
4016
4017         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4018                 err = -EBUSY;
4019                 goto err_free;
4020         }
4021
4022         if (ifmgd->assoc_data) {
4023                 err = -EBUSY;
4024                 goto err_free;
4025         }
4026
4027         if (ifmgd->auth_data) {
4028                 bool match;
4029
4030                 /* keep sta info, bssid if matching */
4031                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4032                 ieee80211_destroy_auth_data(sdata, match);
4033         }
4034
4035         /* prepare assoc data */
4036
4037         ifmgd->beacon_crc_valid = false;
4038
4039         assoc_data->wmm = bss->wmm_used &&
4040                           (local->hw.queues >= IEEE80211_NUM_ACS);
4041         if (assoc_data->wmm) {
4042                 /* try to check validity of WMM params IE */
4043                 const struct cfg80211_bss_ies *ies;
4044                 const u8 *wp, *start, *end;
4045
4046                 rcu_read_lock();
4047                 ies = rcu_dereference(req->bss->ies);
4048                 start = ies->data;
4049                 end = start + ies->len;
4050
4051                 while (true) {
4052                         wp = cfg80211_find_vendor_ie(
4053                                 WLAN_OUI_MICROSOFT,
4054                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4055                                 start, end - start);
4056                         if (!wp)
4057                                 break;
4058                         start = wp + wp[1] + 2;
4059                         /* if this IE is too short, try the next */
4060                         if (wp[1] <= 4)
4061                                 continue;
4062                         /* if this IE is WMM params, we found what we wanted */
4063                         if (wp[6] == 1)
4064                                 break;
4065                 }
4066
4067                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4068                                                         wp[1] - 2)) {
4069                         assoc_data->wmm = false;
4070                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4071                 }
4072                 rcu_read_unlock();
4073         }
4074
4075         /*
4076          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4077          * We still associate in non-HT mode (11a/b/g) if any one of these
4078          * ciphers is configured as pairwise.
4079          * We can set this to true for non-11n hardware, that'll be checked
4080          * separately along with the peer capabilities.
4081          */
4082         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4083                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4084                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4085                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4086                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4087                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4088                         netdev_info(sdata->dev,
4089                                     "disabling HT/VHT due to WEP/TKIP use\n");
4090                 }
4091         }
4092
4093         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4094                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4095                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4096         }
4097
4098         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4099                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4100
4101         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4102         sband = local->hw.wiphy->bands[req->bss->channel->band];
4103         if (!sband->ht_cap.ht_supported ||
4104             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4105             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4106                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4107                 if (!bss->wmm_used &&
4108                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4109                         netdev_info(sdata->dev,
4110                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4111         }
4112
4113         /* disable VHT if we don't support it or the AP doesn't use WMM */
4114         if (!sband->vht_cap.vht_supported ||
4115             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4116             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4117                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4118                 if (!bss->wmm_used &&
4119                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4120                         netdev_info(sdata->dev,
4121                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4122         }
4123
4124         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4125         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4126                sizeof(ifmgd->ht_capa_mask));
4127
4128         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4129         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4130                sizeof(ifmgd->vht_capa_mask));
4131
4132         if (req->ie && req->ie_len) {
4133                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4134                 assoc_data->ie_len = req->ie_len;
4135         }
4136
4137         assoc_data->bss = req->bss;
4138
4139         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4140                 if (ifmgd->powersave)
4141                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4142                 else
4143                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4144         } else
4145                 sdata->smps_mode = ifmgd->req_smps;
4146
4147         assoc_data->capability = req->bss->capability;
4148         assoc_data->supp_rates = bss->supp_rates;
4149         assoc_data->supp_rates_len = bss->supp_rates_len;
4150
4151         rcu_read_lock();
4152         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4153         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4154                 assoc_data->ap_ht_param =
4155                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4156         else
4157                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4158         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4159         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4160                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4161                        sizeof(struct ieee80211_vht_cap));
4162         else
4163                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4164         rcu_read_unlock();
4165
4166         if (bss->wmm_used && bss->uapsd_supported &&
4167             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
4168             sdata->wmm_acm != 0xff) {
4169                 assoc_data->uapsd = true;
4170                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4171         } else {
4172                 assoc_data->uapsd = false;
4173                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4174         }
4175
4176         if (req->prev_bssid)
4177                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4178
4179         if (req->use_mfp) {
4180                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4181                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4182         } else {
4183                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4184                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4185         }
4186
4187         if (req->crypto.control_port)
4188                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4189         else
4190                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4191
4192         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4193         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4194
4195         /* kick off associate process */
4196
4197         ifmgd->assoc_data = assoc_data;
4198         ifmgd->dtim_period = 0;
4199         ifmgd->have_beacon = false;
4200
4201         err = ieee80211_prep_connection(sdata, req->bss, true);
4202         if (err)
4203                 goto err_clear;
4204
4205         rcu_read_lock();
4206         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4207
4208         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4209             !beacon_ies) {
4210                 /*
4211                  * Wait up to one beacon interval ...
4212                  * should this be more if we miss one?
4213                  */
4214                 sdata_info(sdata, "waiting for beacon from %pM\n",
4215                            ifmgd->bssid);
4216                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4217                 assoc_data->timeout_started = true;
4218                 assoc_data->need_beacon = true;
4219         } else if (beacon_ies) {
4220                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4221                                                     beacon_ies->data,
4222                                                     beacon_ies->len);
4223                 u8 dtim_count = 0;
4224
4225                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4226                         const struct ieee80211_tim_ie *tim;
4227                         tim = (void *)(tim_ie + 2);
4228                         ifmgd->dtim_period = tim->dtim_period;
4229                         dtim_count = tim->dtim_count;
4230                 }
4231                 ifmgd->have_beacon = true;
4232                 assoc_data->timeout = jiffies;
4233                 assoc_data->timeout_started = true;
4234
4235                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4236                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4237                         sdata->vif.bss_conf.sync_device_ts =
4238                                 bss->device_ts_beacon;
4239                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4240                 }
4241         } else {
4242                 assoc_data->timeout = jiffies;
4243                 assoc_data->timeout_started = true;
4244         }
4245         rcu_read_unlock();
4246
4247         run_again(sdata, assoc_data->timeout);
4248
4249         if (bss->corrupt_data) {
4250                 char *corrupt_type = "data";
4251                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4252                         if (bss->corrupt_data &
4253                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4254                                 corrupt_type = "beacon and probe response";
4255                         else
4256                                 corrupt_type = "beacon";
4257                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4258                         corrupt_type = "probe response";
4259                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4260                            corrupt_type);
4261         }
4262
4263         return 0;
4264  err_clear:
4265         memset(ifmgd->bssid, 0, ETH_ALEN);
4266         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4267         ifmgd->assoc_data = NULL;
4268  err_free:
4269         kfree(assoc_data);
4270         return err;
4271 }
4272
4273 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4274                          struct cfg80211_deauth_request *req)
4275 {
4276         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4277         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4278         bool tx = !req->local_state_change;
4279         bool report_frame = false;
4280
4281         sdata_info(sdata,
4282                    "deauthenticating from %pM by local choice (reason=%d)\n",
4283                    req->bssid, req->reason_code);
4284
4285         if (ifmgd->auth_data) {
4286                 drv_mgd_prepare_tx(sdata->local, sdata);
4287                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4288                                                IEEE80211_STYPE_DEAUTH,
4289                                                req->reason_code, tx,
4290                                                frame_buf);
4291                 ieee80211_destroy_auth_data(sdata, false);
4292
4293                 report_frame = true;
4294                 goto out;
4295         }
4296
4297         if (ifmgd->associated &&
4298             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4299                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4300                                        req->reason_code, tx, frame_buf);
4301                 report_frame = true;
4302         }
4303
4304  out:
4305         if (report_frame)
4306                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4307                                       IEEE80211_DEAUTH_FRAME_LEN);
4308
4309         return 0;
4310 }
4311
4312 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4313                            struct cfg80211_disassoc_request *req)
4314 {
4315         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4316         u8 bssid[ETH_ALEN];
4317         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4318
4319         /*
4320          * cfg80211 should catch this ... but it's racy since
4321          * we can receive a disassoc frame, process it, hand it
4322          * to cfg80211 while that's in a locked section already
4323          * trying to tell us that the user wants to disconnect.
4324          */
4325         if (ifmgd->associated != req->bss)
4326                 return -ENOLINK;
4327
4328         sdata_info(sdata,
4329                    "disassociating from %pM by local choice (reason=%d)\n",
4330                    req->bss->bssid, req->reason_code);
4331
4332         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4333         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4334                                req->reason_code, !req->local_state_change,
4335                                frame_buf);
4336
4337         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4338                               IEEE80211_DEAUTH_FRAME_LEN);
4339
4340         return 0;
4341 }
4342
4343 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4344 {
4345         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4346
4347         /*
4348          * Make sure some work items will not run after this,
4349          * they will not do anything but might not have been
4350          * cancelled when disconnecting.
4351          */
4352         cancel_work_sync(&ifmgd->monitor_work);
4353         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4354         cancel_work_sync(&ifmgd->request_smps_work);
4355         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4356         cancel_work_sync(&ifmgd->chswitch_work);
4357
4358         sdata_lock(sdata);
4359         if (ifmgd->assoc_data) {
4360                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4361                 ieee80211_destroy_assoc_data(sdata, false);
4362                 cfg80211_assoc_timeout(sdata->dev, bss);
4363         }
4364         if (ifmgd->auth_data)
4365                 ieee80211_destroy_auth_data(sdata, false);
4366         del_timer_sync(&ifmgd->timer);
4367         sdata_unlock(sdata);
4368 }
4369
4370 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4371                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4372                                gfp_t gfp)
4373 {
4374         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4375
4376         trace_api_cqm_rssi_notify(sdata, rssi_event);
4377
4378         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4379 }
4380 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);