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 chandef_downgrade(struct cfg80211_chan_def *c)
 149 {
 150         u32 ret;
 151         int tmp;
 152
 153         switch (c->width) {
 154         case NL80211_CHAN_WIDTH_20:
 155                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
 156                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 157                 break;
 158         case NL80211_CHAN_WIDTH_40:
 159                 c->width = NL80211_CHAN_WIDTH_20;
 160                 c->center_freq1 = c->chan->center_freq;
 161                 ret = IEEE80211_STA_DISABLE_40MHZ |
 162                       IEEE80211_STA_DISABLE_VHT;
 163                 break;
 164         case NL80211_CHAN_WIDTH_80:
 165                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
 166                 /* n_P40 */
 167                 tmp /= 2;
 168                 /* freq_P40 */
 169                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
 170                 c->width = NL80211_CHAN_WIDTH_40;
 171                 ret = IEEE80211_STA_DISABLE_VHT;
 172                 break;
 173         case NL80211_CHAN_WIDTH_80P80:
 174                 c->center_freq2 = 0;
 175                 c->width = NL80211_CHAN_WIDTH_80;
 176                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
 177                       IEEE80211_STA_DISABLE_160MHZ;
 178                 break;
 179         case NL80211_CHAN_WIDTH_160:
 180                 /* n_P20 */
 181                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
 182                 /* n_P80 */
 183                 tmp /= 4;
 184                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
 185                 c->width = NL80211_CHAN_WIDTH_80;
 186                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
 187                       IEEE80211_STA_DISABLE_160MHZ;
 188                 break;
 189         default:
 190         case NL80211_CHAN_WIDTH_20_NOHT:
 191                 WARN_ON_ONCE(1);
 192                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
 193                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 194                 break;
 195         case NL80211_CHAN_WIDTH_5:
 196         case NL80211_CHAN_WIDTH_10:
 197                 WARN_ON_ONCE(1);
 198                 /* keep c->width */
 199                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 200                 break;
 201         }
 202
 203         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
 204
 205         return ret;
 206 }
 207
 208 static u32
 209 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 210                              struct ieee80211_supported_band *sband,
 211                              struct ieee80211_channel *channel,
 212                              const struct ieee80211_ht_operation *ht_oper,
 213                              const struct ieee80211_vht_operation *vht_oper,
 214                              struct cfg80211_chan_def *chandef, bool tracking)
 215 {
 216         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 217         struct cfg80211_chan_def vht_chandef;
 218         u32 ht_cfreq, ret;
 219
 220         chandef->chan = channel;
 221         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 222         chandef->center_freq1 = channel->center_freq;
 223         chandef->center_freq2 = 0;
 224
 225         if (!ht_oper || !sband->ht_cap.ht_supported) {
 226                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 227                 goto out;
 228         }
 229
 230         chandef->width = NL80211_CHAN_WIDTH_20;
 231
 232         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 233                                                   channel->band);
 234         /* check that channel matches the right operating channel */
 235         if (!tracking && channel->center_freq != ht_cfreq) {
 236                 /*
 237                  * It's possible that some APs are confused here;
 238                  * Netgear WNDR3700 sometimes reports 4 higher than
 239                  * the actual channel in association responses, but
 240                  * since we look at probe response/beacon data here
 241                  * it should be OK.
 242                  */
 243                 sdata_info(sdata,
 244                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 245                            channel->center_freq, ht_cfreq,
 246                            ht_oper->primary_chan, channel->band);
 247                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 248                 goto out;
 249         }
 250
 251         /* check 40 MHz support, if we have it */
 252         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 253                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 254                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 255                         chandef->width = NL80211_CHAN_WIDTH_40;
 256                         chandef->center_freq1 += 10;
 257                         break;
 258                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 259                         chandef->width = NL80211_CHAN_WIDTH_40;
 260                         chandef->center_freq1 -= 10;
 261                         break;
 262                 }
 263         } else {
 264                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 265                 ret = IEEE80211_STA_DISABLE_VHT;
 266                 /* also mark 40 MHz disabled */
 267                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 268                 goto out;
 269         }
 270
 271         if (!vht_oper || !sband->vht_cap.vht_supported) {
 272                 ret = IEEE80211_STA_DISABLE_VHT;
 273                 goto out;
 274         }
 275
 276         vht_chandef.chan = channel;
 277         vht_chandef.center_freq1 =
 278                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 279                                                channel->band);
 280         vht_chandef.center_freq2 = 0;
 281
 282         switch (vht_oper->chan_width) {
 283         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 284                 vht_chandef.width = chandef->width;
 285                 break;
 286         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 287                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 288                 break;
 289         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 290                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 291                 break;
 292         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 293                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 294                 vht_chandef.center_freq2 =
 295                         ieee80211_channel_to_frequency(
 296                                 vht_oper->center_freq_seg2_idx,
 297                                 channel->band);
 298                 break;
 299         default:
 300                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 301                         sdata_info(sdata,
 302                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 303                                    vht_oper->chan_width);
 304                 ret = IEEE80211_STA_DISABLE_VHT;
 305                 goto out;
 306         }
 307
 308         if (!cfg80211_chandef_valid(&vht_chandef)) {
 309                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 310                         sdata_info(sdata,
 311                                    "AP VHT information is invalid, disable VHT\n");
 312                 ret = IEEE80211_STA_DISABLE_VHT;
 313                 goto out;
 314         }
 315
 316         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 317                 ret = 0;
 318                 goto out;
 319         }
 320
 321         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 322                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 323                         sdata_info(sdata,
 324                                    "AP VHT information doesn't match HT, disable VHT\n");
 325                 ret = IEEE80211_STA_DISABLE_VHT;
 326                 goto out;
 327         }
 328
 329         *chandef = vht_chandef;
 330
 331         ret = 0;
 332
 333 out:
 334         /* don't print the message below for VHT mismatch if VHT is disabled */
 335         if (ret & IEEE80211_STA_DISABLE_VHT)
 336                 vht_chandef = *chandef;
 337
 338         /*
 339          * Ignore the DISABLED flag when we're already connected and only
 340          * tracking the APs beacon for bandwidth changes - otherwise we
 341          * might get disconnected here if we connect to an AP, update our
 342          * regulatory information based on the AP's country IE and the
 343          * information we have is wrong/outdated and disables the channel
 344          * that we're actually using for the connection to the AP.
 345          */
 346         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 347                                         tracking ? 0 :
 348                                                    IEEE80211_CHAN_DISABLED)) {
 349                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 350                         ret = IEEE80211_STA_DISABLE_HT |
 351                               IEEE80211_STA_DISABLE_VHT;
 352                         break;
 353                 }
 354
 355                 ret |= chandef_downgrade(chandef);
 356         }
 357
 358         if (chandef->width != vht_chandef.width && !tracking)
 359                 sdata_info(sdata,
 360                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 361
 362         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 363         return ret;
 364 }
 365
 366 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 367                                struct sta_info *sta,
 368                                const struct ieee80211_ht_operation *ht_oper,
 369                                const struct ieee80211_vht_operation *vht_oper,
 370                                const u8 *bssid, u32 *changed)
 371 {
 372         struct ieee80211_local *local = sdata->local;
 373         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 374         struct ieee80211_supported_band *sband;
 375         struct ieee80211_channel *chan;
 376         struct cfg80211_chan_def chandef;
 377         u16 ht_opmode;
 378         u32 flags;
 379         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 380         int ret;
 381
 382         /* if HT was/is disabled, don't track any bandwidth changes */
 383         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 384                 return 0;
 385
 386         /* don't check VHT if we associated as non-VHT station */
 387         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 388                 vht_oper = NULL;
 389
 390         if (WARN_ON_ONCE(!sta))
 391                 return -EINVAL;
 392
 393         chan = sdata->vif.bss_conf.chandef.chan;
 394         sband = local->hw.wiphy->bands[chan->band];
 395
 396         /* calculate new channel (type) based on HT/VHT operation IEs */
 397         flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
 398                                              vht_oper, &chandef, true);
 399
 400         /*
 401          * Downgrade the new channel if we associated with restricted
 402          * capabilities. For example, if we associated as a 20 MHz STA
 403          * to a 40 MHz AP (due to regulatory, capabilities or config
 404          * reasons) then switching to a 40 MHz channel now won't do us
 405          * any good -- we couldn't use it with the AP.
 406          */
 407         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 408             chandef.width == NL80211_CHAN_WIDTH_80P80)
 409                 flags |= chandef_downgrade(&chandef);
 410         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 411             chandef.width == NL80211_CHAN_WIDTH_160)
 412                 flags |= chandef_downgrade(&chandef);
 413         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 414             chandef.width > NL80211_CHAN_WIDTH_20)
 415                 flags |= chandef_downgrade(&chandef);
 416
 417         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 418                 return 0;
 419
 420         sdata_info(sdata,
 421                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 422                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 423                    chandef.center_freq1, chandef.center_freq2);
 424
 425         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 426                                       IEEE80211_STA_DISABLE_VHT |
 427                                       IEEE80211_STA_DISABLE_40MHZ |
 428                                       IEEE80211_STA_DISABLE_80P80MHZ |
 429                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 430             !cfg80211_chandef_valid(&chandef)) {
 431                 sdata_info(sdata,
 432                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 433                            ifmgd->bssid);
 434                 return -EINVAL;
 435         }
 436
 437         switch (chandef.width) {
 438         case NL80211_CHAN_WIDTH_20_NOHT:
 439         case NL80211_CHAN_WIDTH_20:
 440                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 441                 break;
 442         case NL80211_CHAN_WIDTH_40:
 443                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 444                 break;
 445         case NL80211_CHAN_WIDTH_80:
 446                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 447                 break;
 448         case NL80211_CHAN_WIDTH_80P80:
 449         case NL80211_CHAN_WIDTH_160:
 450                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 451                 break;
 452         default:
 453                 return -EINVAL;
 454         }
 455
 456         if (new_sta_bw > sta->cur_max_bandwidth)
 457                 new_sta_bw = sta->cur_max_bandwidth;
 458
 459         if (new_sta_bw < sta->sta.bandwidth) {
 460                 sta->sta.bandwidth = new_sta_bw;
 461                 rate_control_rate_update(local, sband, sta,
 462                                          IEEE80211_RC_BW_CHANGED);
 463         }
 464
 465         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 466         if (ret) {
 467                 sdata_info(sdata,
 468                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 469                            ifmgd->bssid);
 470                 return ret;
 471         }
 472
 473         if (new_sta_bw > sta->sta.bandwidth) {
 474                 sta->sta.bandwidth = new_sta_bw;
 475                 rate_control_rate_update(local, sband, sta,
 476                                          IEEE80211_RC_BW_CHANGED);
 477         }
 478
 479         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 480
 481         /* if bss configuration changed store the new one */
 482         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 483                 *changed |= BSS_CHANGED_HT;
 484                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 485         }
 486
 487         return 0;
 488 }
 489
 490 /* frame sending functions */
 491
 492 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 493                                 struct sk_buff *skb, u8 ap_ht_param,
 494                                 struct ieee80211_supported_band *sband,
 495                                 struct ieee80211_channel *channel,
 496                                 enum ieee80211_smps_mode smps)
 497 {
 498         u8 *pos;
 499         u32 flags = channel->flags;
 500         u16 cap;
 501         struct ieee80211_sta_ht_cap ht_cap;
 502
 503         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 504
 505         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 506         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 507
 508         /* determine capability flags */
 509         cap = ht_cap.cap;
 510
 511         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 512         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 513                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 514                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 515                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 516                 }
 517                 break;
 518         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 519                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 520                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 521                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 522                 }
 523                 break;
 524         }
 525
 526         /*
 527          * If 40 MHz was disabled associate as though we weren't
 528          * capable of 40 MHz -- some broken APs will never fall
 529          * back to trying to transmit in 20 MHz.
 530          */
 531         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 532                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 533                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 534         }
 535
 536         /* set SM PS mode properly */
 537         cap &= ~IEEE80211_HT_CAP_SM_PS;
 538         switch (smps) {
 539         case IEEE80211_SMPS_AUTOMATIC:
 540         case IEEE80211_SMPS_NUM_MODES:
 541                 WARN_ON(1);
 542         case IEEE80211_SMPS_OFF:
 543                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 544                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 545                 break;
 546         case IEEE80211_SMPS_STATIC:
 547                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 548                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 549                 break;
 550         case IEEE80211_SMPS_DYNAMIC:
 551                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 552                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 553                 break;
 554         }
 555
 556         /* reserve and fill IE */
 557         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 558         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 559 }
 560
 561 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 562                                  struct sk_buff *skb,
 563                                  struct ieee80211_supported_band *sband,
 564                                  struct ieee80211_vht_cap *ap_vht_cap)
 565 {
 566         u8 *pos;
 567         u32 cap;
 568         struct ieee80211_sta_vht_cap vht_cap;
 569
 570         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 571
 572         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 573         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 574
 575         /* determine capability flags */
 576         cap = vht_cap.cap;
 577
 578         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 579                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 580                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 581         }
 582
 583         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 584                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 585                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 586         }
 587
 588         /*
 589          * Some APs apparently get confused if our capabilities are better
 590          * than theirs, so restrict what we advertise in the assoc request.
 591          */
 592         if (!(ap_vht_cap->vht_cap_info &
 593                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 594                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 595
 596         /* reserve and fill IE */
 597         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 598         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 599 }
 600
 601 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 602 {
 603         struct ieee80211_local *local = sdata->local;
 604         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 605         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 606         struct sk_buff *skb;
 607         struct ieee80211_mgmt *mgmt;
 608         u8 *pos, qos_info;
 609         size_t offset = 0, noffset;
 610         int i, count, rates_len, supp_rates_len, shift;
 611         u16 capab;
 612         struct ieee80211_supported_band *sband;
 613         struct ieee80211_chanctx_conf *chanctx_conf;
 614         struct ieee80211_channel *chan;
 615         u32 rate_flags, rates = 0;
 616
 617         sdata_assert_lock(sdata);
 618
 619         rcu_read_lock();
 620         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 621         if (WARN_ON(!chanctx_conf)) {
 622                 rcu_read_unlock();
 623                 return;
 624         }
 625         chan = chanctx_conf->def.chan;
 626         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 627         rcu_read_unlock();
 628         sband = local->hw.wiphy->bands[chan->band];
 629         shift = ieee80211_vif_get_shift(&sdata->vif);
 630
 631         if (assoc_data->supp_rates_len) {
 632                 /*
 633                  * Get all rates supported by the device and the AP as
 634                  * some APs don't like getting a superset of their rates
 635                  * in the association request (e.g. D-Link DAP 1353 in
 636                  * b-only mode)...
 637                  */
 638                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 639                                                      assoc_data->supp_rates,
 640                                                      assoc_data->supp_rates_len,
 641                                                      &rates);
 642         } else {
 643                 /*
 644                  * In case AP not provide any supported rates information
 645                  * before association, we send information element(s) with
 646                  * all rates that we support.
 647                  */
 648                 rates_len = 0;
 649                 for (i = 0; i < sband->n_bitrates; i++) {
 650                         if ((rate_flags & sband->bitrates[i].flags)
 651                             != rate_flags)
 652                                 continue;
 653                         rates |= BIT(i);
 654                         rates_len++;
 655                 }
 656         }
 657
 658         skb = alloc_skb(local->hw.extra_tx_headroom +
 659                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 660                         2 + assoc_data->ssid_len + /* SSID */
 661                         4 + rates_len + /* (extended) rates */
 662                         4 + /* power capability */
 663                         2 + 2 * sband->n_channels + /* supported channels */
 664                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 665                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 666                         assoc_data->ie_len + /* extra IEs */
 667                         9, /* WMM */
 668                         GFP_KERNEL);
 669         if (!skb)
 670                 return;
 671
 672         skb_reserve(skb, local->hw.extra_tx_headroom);
 673
 674         capab = WLAN_CAPABILITY_ESS;
 675
 676         if (sband->band == IEEE80211_BAND_2GHZ) {
 677                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 678                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 679                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 680                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 681         }
 682
 683         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 684                 capab |= WLAN_CAPABILITY_PRIVACY;
 685
 686         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 687             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 688                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 689
 690         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 691         memset(mgmt, 0, 24);
 692         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 693         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 694         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 695
 696         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 697                 skb_put(skb, 10);
 698                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 699                                                   IEEE80211_STYPE_REASSOC_REQ);
 700                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 701                 mgmt->u.reassoc_req.listen_interval =
 702                                 cpu_to_le16(local->hw.conf.listen_interval);
 703                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 704                        ETH_ALEN);
 705         } else {
 706                 skb_put(skb, 4);
 707                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 708                                                   IEEE80211_STYPE_ASSOC_REQ);
 709                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 710                 mgmt->u.assoc_req.listen_interval =
 711                                 cpu_to_le16(local->hw.conf.listen_interval);
 712         }
 713
 714         /* SSID */
 715         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 716         *pos++ = WLAN_EID_SSID;
 717         *pos++ = assoc_data->ssid_len;
 718         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 719
 720         /* add all rates which were marked to be used above */
 721         supp_rates_len = rates_len;
 722         if (supp_rates_len > 8)
 723                 supp_rates_len = 8;
 724
 725         pos = skb_put(skb, supp_rates_len + 2);
 726         *pos++ = WLAN_EID_SUPP_RATES;
 727         *pos++ = supp_rates_len;
 728
 729         count = 0;
 730         for (i = 0; i < sband->n_bitrates; i++) {
 731                 if (BIT(i) & rates) {
 732                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 733                                                 5 * (1 << shift));
 734                         *pos++ = (u8) rate;
 735                         if (++count == 8)
 736                                 break;
 737                 }
 738         }
 739
 740         if (rates_len > count) {
 741                 pos = skb_put(skb, rates_len - count + 2);
 742                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 743                 *pos++ = rates_len - count;
 744
 745                 for (i++; i < sband->n_bitrates; i++) {
 746                         if (BIT(i) & rates) {
 747                                 int rate;
 748                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 749                                                     5 * (1 << shift));
 750                                 *pos++ = (u8) rate;
 751                         }
 752                 }
 753         }
 754
 755         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 756                 /* 1. power capabilities */
 757                 pos = skb_put(skb, 4);
 758                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 759                 *pos++ = 2;
 760                 *pos++ = 0; /* min tx power */
 761                  /* max tx power */
 762                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 763
 764                 /* 2. supported channels */
 765                 /* TODO: get this in reg domain format */
 766                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 767                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 768                 *pos++ = 2 * sband->n_channels;
 769                 for (i = 0; i < sband->n_channels; i++) {
 770                         *pos++ = ieee80211_frequency_to_channel(
 771                                         sband->channels[i].center_freq);
 772                         *pos++ = 1; /* one channel in the subband*/
 773                 }
 774         }
 775
 776         /* if present, add any custom IEs that go before HT */
 777         if (assoc_data->ie_len && assoc_data->ie) {
 778                 static const u8 before_ht[] = {
 779                         WLAN_EID_SSID,
 780                         WLAN_EID_SUPP_RATES,
 781                         WLAN_EID_EXT_SUPP_RATES,
 782                         WLAN_EID_PWR_CAPABILITY,
 783                         WLAN_EID_SUPPORTED_CHANNELS,
 784                         WLAN_EID_RSN,
 785                         WLAN_EID_QOS_CAPA,
 786                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 787                         WLAN_EID_MOBILITY_DOMAIN,
 788                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 789                 };
 790                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 791                                              before_ht, ARRAY_SIZE(before_ht),
 792                                              offset);
 793                 pos = skb_put(skb, noffset - offset);
 794                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 795                 offset = noffset;
 796         }
 797
 798         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 799                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 800                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 801
 802         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 803                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 804                                     sband, chan, sdata->smps_mode);
 805
 806         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 807                 ieee80211_add_vht_ie(sdata, skb, sband,
 808                                      &assoc_data->ap_vht_cap);
 809
 810         /* if present, add any custom non-vendor IEs that go after HT */
 811         if (assoc_data->ie_len && assoc_data->ie) {
 812                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 813                                                     assoc_data->ie_len,
 814                                                     offset);
 815                 pos = skb_put(skb, noffset - offset);
 816                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 817                 offset = noffset;
 818         }
 819
 820         if (assoc_data->wmm) {
 821                 if (assoc_data->uapsd) {
 822                         qos_info = ifmgd->uapsd_queues;
 823                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 824                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 825                 } else {
 826                         qos_info = 0;
 827                 }
 828
 829                 pos = skb_put(skb, 9);
 830                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 831                 *pos++ = 7; /* len */
 832                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 833                 *pos++ = 0x50;
 834                 *pos++ = 0xf2;
 835                 *pos++ = 2; /* WME */
 836                 *pos++ = 0; /* WME info */
 837                 *pos++ = 1; /* WME ver */
 838                 *pos++ = qos_info;
 839         }
 840
 841         /* add any remaining custom (i.e. vendor specific here) IEs */
 842         if (assoc_data->ie_len && assoc_data->ie) {
 843                 noffset = assoc_data->ie_len;
 844                 pos = skb_put(skb, noffset - offset);
 845                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 846         }
 847
 848         drv_mgd_prepare_tx(local, sdata);
 849
 850         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 851         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 852                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 853                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 854         ieee80211_tx_skb(sdata, skb);
 855 }
 856
 857 void ieee80211_send_pspoll(struct ieee80211_local *local,
 858                            struct ieee80211_sub_if_data *sdata)
 859 {
 860         struct ieee80211_pspoll *pspoll;
 861         struct sk_buff *skb;
 862
 863         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 864         if (!skb)
 865                 return;
 866
 867         pspoll = (struct ieee80211_pspoll *) skb->data;
 868         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 869
 870         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 871         ieee80211_tx_skb(sdata, skb);
 872 }
 873
 874 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 875                              struct ieee80211_sub_if_data *sdata,
 876                              int powersave)
 877 {
 878         struct sk_buff *skb;
 879         struct ieee80211_hdr_3addr *nullfunc;
 880         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 881
 882         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 883         if (!skb)
 884                 return;
 885
 886         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 887         if (powersave)
 888                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 889
 890         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 891                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 892
 893         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 894                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 895
 896         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 897                             IEEE80211_STA_CONNECTION_POLL))
 898                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 899
 900         ieee80211_tx_skb(sdata, skb);
 901 }
 902
 903 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 904                                           struct ieee80211_sub_if_data *sdata)
 905 {
 906         struct sk_buff *skb;
 907         struct ieee80211_hdr *nullfunc;
 908         __le16 fc;
 909
 910         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 911                 return;
 912
 913         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 914         if (!skb)
 915                 return;
 916
 917         skb_reserve(skb, local->hw.extra_tx_headroom);
 918
 919         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 920         memset(nullfunc, 0, 30);
 921         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 922                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 923         nullfunc->frame_control = fc;
 924         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 925         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 926         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 927         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 928
 929         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 930         ieee80211_tx_skb(sdata, skb);
 931 }
 932
 933 /* spectrum management related things */
 934 static void ieee80211_chswitch_work(struct work_struct *work)
 935 {
 936         struct ieee80211_sub_if_data *sdata =
 937                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 938         struct ieee80211_local *local = sdata->local;
 939         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 940
 941         if (!ieee80211_sdata_running(sdata))
 942                 return;
 943
 944         sdata_lock(sdata);
 945         if (!ifmgd->associated)
 946                 goto out;
 947
 948         local->_oper_chandef = local->csa_chandef;
 949
 950         if (!local->ops->channel_switch) {
 951                 /* call "hw_config" only if doing sw channel switch */
 952                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 953         } else {
 954                 /* update the device channel directly */
 955                 local->hw.conf.chandef = local->_oper_chandef;
 956         }
 957
 958         /* XXX: shouldn't really modify cfg80211-owned data! */
 959         ifmgd->associated->channel = local->_oper_chandef.chan;
 960
 961         /* XXX: wait for a beacon first? */
 962         ieee80211_wake_queues_by_reason(&local->hw,
 963                                         IEEE80211_MAX_QUEUE_MAP,
 964                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 965  out:
 966         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 967         sdata_unlock(sdata);
 968 }
 969
 970 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 971 {
 972         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 973         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 974
 975         trace_api_chswitch_done(sdata, success);
 976         if (!success) {
 977                 sdata_info(sdata,
 978                            "driver channel switch failed, disconnecting\n");
 979                 ieee80211_queue_work(&sdata->local->hw,
 980                                      &ifmgd->csa_connection_drop_work);
 981         } else {
 982                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 983         }
 984 }
 985 EXPORT_SYMBOL(ieee80211_chswitch_done);
 986
 987 static void ieee80211_chswitch_timer(unsigned long data)
 988 {
 989         struct ieee80211_sub_if_data *sdata =
 990                 (struct ieee80211_sub_if_data *) data;
 991
 992         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
 993 }
 994
 995 static void
 996 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 997                                  u64 timestamp, struct ieee802_11_elems *elems,
 998                                  bool beacon)
 999 {
1000         struct ieee80211_local *local = sdata->local;
1001         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1002         struct cfg80211_bss *cbss = ifmgd->associated;
1003         struct ieee80211_bss *bss;
1004         struct ieee80211_chanctx *chanctx;
1005         enum ieee80211_band new_band;
1006         int new_freq;
1007         u8 new_chan_no;
1008         u8 count;
1009         u8 mode;
1010         struct ieee80211_channel *new_chan;
1011         struct cfg80211_chan_def new_chandef = {};
1012         struct cfg80211_chan_def new_vht_chandef = {};
1013         const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
1014         const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
1015         const struct ieee80211_ht_operation *ht_oper;
1016         int secondary_channel_offset = -1;
1017
1018         sdata_assert_lock(sdata);
1019
1020         if (!cbss)
1021                 return;
1022
1023         if (local->scanning)
1024                 return;
1025
1026         /* disregard subsequent announcements if we are already processing */
1027         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
1028                 return;
1029
1030         sec_chan_offs = elems->sec_chan_offs;
1031         wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
1032         ht_oper = elems->ht_operation;
1033
1034         if (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
1035                             IEEE80211_STA_DISABLE_40MHZ)) {
1036                 sec_chan_offs = NULL;
1037                 wide_bw_chansw_ie = NULL;
1038                 /* only used for bandwidth here */
1039                 ht_oper = NULL;
1040         }
1041
1042         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
1043                 wide_bw_chansw_ie = NULL;
1044
1045         if (elems->ext_chansw_ie) {
1046                 if (!ieee80211_operating_class_to_band(
1047                                 elems->ext_chansw_ie->new_operating_class,
1048                                 &new_band)) {
1049                         sdata_info(sdata,
1050                                    "cannot understand ECSA IE operating class %d, disconnecting\n",
1051                                    elems->ext_chansw_ie->new_operating_class);
1052                         ieee80211_queue_work(&local->hw,
1053                                              &ifmgd->csa_connection_drop_work);
1054                 }
1055                 new_chan_no = elems->ext_chansw_ie->new_ch_num;
1056                 count = elems->ext_chansw_ie->count;
1057                 mode = elems->ext_chansw_ie->mode;
1058         } else if (elems->ch_switch_ie) {
1059                 new_band = cbss->channel->band;
1060                 new_chan_no = elems->ch_switch_ie->new_ch_num;
1061                 count = elems->ch_switch_ie->count;
1062                 mode = elems->ch_switch_ie->mode;
1063         } else {
1064                 /* nothing here we understand */
1065                 return;
1066         }
1067
1068         bss = (void *)cbss->priv;
1069
1070         new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
1071         new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
1072         if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
1073                 sdata_info(sdata,
1074                            "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
1075                            ifmgd->associated->bssid, new_freq);
1076                 ieee80211_queue_work(&local->hw,
1077                                      &ifmgd->csa_connection_drop_work);
1078                 return;
1079         }
1080
1081         if (!beacon && sec_chan_offs) {
1082                 secondary_channel_offset = sec_chan_offs->sec_chan_offs;
1083         } else if (beacon && ht_oper) {
1084                 secondary_channel_offset =
1085                         ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET;
1086         } else if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
1087                 /*
1088                  * If it's not a beacon, HT is enabled and the IE not present,
1089                  * it's 20 MHz, 802.11-2012 8.5.2.6:
1090                  *      This element [the Secondary Channel Offset Element] is
1091                  *      present when switching to a 40 MHz channel. It may be
1092                  *      present when switching to a 20 MHz channel (in which
1093                  *      case the secondary channel offset is set to SCN).
1094                  */
1095                 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1096         }
1097
1098         switch (secondary_channel_offset) {
1099         default:
1100                 /* secondary_channel_offset was present but is invalid */
1101         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1102                 cfg80211_chandef_create(&new_chandef, new_chan,
1103                                         NL80211_CHAN_HT20);
1104                 break;
1105         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1106                 cfg80211_chandef_create(&new_chandef, new_chan,
1107                                         NL80211_CHAN_HT40PLUS);
1108                 break;
1109         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1110                 cfg80211_chandef_create(&new_chandef, new_chan,
1111                                         NL80211_CHAN_HT40MINUS);
1112                 break;
1113         case -1:
1114                 cfg80211_chandef_create(&new_chandef, new_chan,
1115                                         NL80211_CHAN_NO_HT);
1116                 /* keep width for 5/10 MHz channels */
1117                 switch (sdata->vif.bss_conf.chandef.width) {
1118                 case NL80211_CHAN_WIDTH_5:
1119                 case NL80211_CHAN_WIDTH_10:
1120                         new_chandef.width = sdata->vif.bss_conf.chandef.width;
1121                         break;
1122                 default:
1123                         break;
1124                 }
1125                 break;
1126         }
1127
1128         if (wide_bw_chansw_ie) {
1129                 new_vht_chandef.chan = new_chan;
1130                 new_vht_chandef.center_freq1 =
1131                         ieee80211_channel_to_frequency(
1132                                 wide_bw_chansw_ie->new_center_freq_seg0,
1133                                 new_band);
1134
1135                 switch (wide_bw_chansw_ie->new_channel_width) {
1136                 default:
1137                         /* hmmm, ignore VHT and use HT if present */
1138                 case IEEE80211_VHT_CHANWIDTH_USE_HT:
1139                         new_vht_chandef.chan = NULL;
1140                         break;
1141                 case IEEE80211_VHT_CHANWIDTH_80MHZ:
1142                         new_vht_chandef.width = NL80211_CHAN_WIDTH_80;
1143                         break;
1144                 case IEEE80211_VHT_CHANWIDTH_160MHZ:
1145                         new_vht_chandef.width = NL80211_CHAN_WIDTH_160;
1146                         break;
1147                 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
1148                         /* field is otherwise reserved */
1149                         new_vht_chandef.center_freq2 =
1150                                 ieee80211_channel_to_frequency(
1151                                         wide_bw_chansw_ie->new_center_freq_seg1,
1152                                         new_band);
1153                         new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
1154                         break;
1155                 }
1156                 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
1157                     new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
1158                         chandef_downgrade(&new_vht_chandef);
1159                 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
1160                     new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
1161                         chandef_downgrade(&new_vht_chandef);
1162                 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
1163                     new_vht_chandef.width > NL80211_CHAN_WIDTH_20)
1164                         chandef_downgrade(&new_vht_chandef);
1165         }
1166
1167         /* if VHT data is there validate & use it */
1168         if (new_vht_chandef.chan) {
1169                 if (!cfg80211_chandef_compatible(&new_vht_chandef,
1170                                                  &new_chandef)) {
1171                         sdata_info(sdata,
1172                                    "AP %pM CSA has inconsistent channel data, disconnecting\n",
1173                                    ifmgd->associated->bssid);
1174                         ieee80211_queue_work(&local->hw,
1175                                              &ifmgd->csa_connection_drop_work);
1176                         return;
1177                 }
1178                 new_chandef = new_vht_chandef;
1179         }
1180
1181         if (!cfg80211_chandef_usable(local->hw.wiphy, &new_chandef,
1182                                      IEEE80211_CHAN_DISABLED)) {
1183                 sdata_info(sdata,
1184                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1185                            ifmgd->associated->bssid, new_freq,
1186                            new_chandef.width, new_chandef.center_freq1,
1187                            new_chandef.center_freq2);
1188                 ieee80211_queue_work(&local->hw,
1189                                      &ifmgd->csa_connection_drop_work);
1190                 return;
1191         }
1192
1193         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1194
1195         if (local->use_chanctx) {
1196                 sdata_info(sdata,
1197                            "not handling channel switch with channel contexts\n");
1198                 ieee80211_queue_work(&local->hw,
1199                                      &ifmgd->csa_connection_drop_work);
1200                 return;
1201         }
1202
1203         mutex_lock(&local->chanctx_mtx);
1204         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1205                 mutex_unlock(&local->chanctx_mtx);
1206                 return;
1207         }
1208         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1209                                struct ieee80211_chanctx, conf);
1210         if (chanctx->refcount > 1) {
1211                 sdata_info(sdata,
1212                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
1213                 ieee80211_queue_work(&local->hw,
1214                                      &ifmgd->csa_connection_drop_work);
1215                 mutex_unlock(&local->chanctx_mtx);
1216                 return;
1217         }
1218         mutex_unlock(&local->chanctx_mtx);
1219
1220         local->csa_chandef = new_chandef;
1221
1222         if (mode)
1223                 ieee80211_stop_queues_by_reason(&local->hw,
1224                                 IEEE80211_MAX_QUEUE_MAP,
1225                                 IEEE80211_QUEUE_STOP_REASON_CSA);
1226
1227         if (local->ops->channel_switch) {
1228                 /* use driver's channel switch callback */
1229                 struct ieee80211_channel_switch ch_switch = {
1230                         .timestamp = timestamp,
1231                         .block_tx = mode,
1232                         .chandef = new_chandef,
1233                         .count = count,
1234                 };
1235
1236                 drv_channel_switch(local, &ch_switch);
1237                 return;
1238         }
1239
1240         /* channel switch handled in software */
1241         if (count <= 1)
1242                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1243         else
1244                 mod_timer(&ifmgd->chswitch_timer,
1245                           TU_TO_EXP_TIME(count * cbss->beacon_interval));
1246 }
1247
1248 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1249                                        struct ieee80211_channel *channel,
1250                                        const u8 *country_ie, u8 country_ie_len,
1251                                        const u8 *pwr_constr_elem)
1252 {
1253         struct ieee80211_country_ie_triplet *triplet;
1254         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1255         int i, chan_pwr, chan_increment, new_ap_level;
1256         bool have_chan_pwr = false;
1257
1258         /* Invalid IE */
1259         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1260                 return 0;
1261
1262         triplet = (void *)(country_ie + 3);
1263         country_ie_len -= 3;
1264
1265         switch (channel->band) {
1266         default:
1267                 WARN_ON_ONCE(1);
1268                 /* fall through */
1269         case IEEE80211_BAND_2GHZ:
1270         case IEEE80211_BAND_60GHZ:
1271                 chan_increment = 1;
1272                 break;
1273         case IEEE80211_BAND_5GHZ:
1274                 chan_increment = 4;
1275                 break;
1276         }
1277
1278         /* find channel */
1279         while (country_ie_len >= 3) {
1280                 u8 first_channel = triplet->chans.first_channel;
1281
1282                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1283                         goto next;
1284
1285                 for (i = 0; i < triplet->chans.num_channels; i++) {
1286                         if (first_channel + i * chan_increment == chan) {
1287                                 have_chan_pwr = true;
1288                                 chan_pwr = triplet->chans.max_power;
1289                                 break;
1290                         }
1291                 }
1292                 if (have_chan_pwr)
1293                         break;
1294
1295  next:
1296                 triplet++;
1297                 country_ie_len -= 3;
1298         }
1299
1300         if (!have_chan_pwr)
1301                 return 0;
1302
1303         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1304
1305         if (sdata->ap_power_level == new_ap_level)
1306                 return 0;
1307
1308         sdata_info(sdata,
1309                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1310                    new_ap_level, chan_pwr, *pwr_constr_elem,
1311                    sdata->u.mgd.bssid);
1312         sdata->ap_power_level = new_ap_level;
1313         if (__ieee80211_recalc_txpower(sdata))
1314                 return BSS_CHANGED_TXPOWER;
1315         return 0;
1316 }
1317
1318 /* powersave */
1319 static void ieee80211_enable_ps(struct ieee80211_local *local,
1320                                 struct ieee80211_sub_if_data *sdata)
1321 {
1322         struct ieee80211_conf *conf = &local->hw.conf;
1323
1324         /*
1325          * If we are scanning right now then the parameters will
1326          * take effect when scan finishes.
1327          */
1328         if (local->scanning)
1329                 return;
1330
1331         if (conf->dynamic_ps_timeout > 0 &&
1332             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1333                 mod_timer(&local->dynamic_ps_timer, jiffies +
1334                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1335         } else {
1336                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1337                         ieee80211_send_nullfunc(local, sdata, 1);
1338
1339                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1340                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1341                         return;
1342
1343                 conf->flags |= IEEE80211_CONF_PS;
1344                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1345         }
1346 }
1347
1348 static void ieee80211_change_ps(struct ieee80211_local *local)
1349 {
1350         struct ieee80211_conf *conf = &local->hw.conf;
1351
1352         if (local->ps_sdata) {
1353                 ieee80211_enable_ps(local, local->ps_sdata);
1354         } else if (conf->flags & IEEE80211_CONF_PS) {
1355                 conf->flags &= ~IEEE80211_CONF_PS;
1356                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1357                 del_timer_sync(&local->dynamic_ps_timer);
1358                 cancel_work_sync(&local->dynamic_ps_enable_work);
1359         }
1360 }
1361
1362 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1363 {
1364         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1365         struct sta_info *sta = NULL;
1366         bool authorized = false;
1367
1368         if (!mgd->powersave)
1369                 return false;
1370
1371         if (mgd->broken_ap)
1372                 return false;
1373
1374         if (!mgd->associated)
1375                 return false;
1376
1377         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
1378                           IEEE80211_STA_CONNECTION_POLL))
1379                 return false;
1380
1381         if (!mgd->have_beacon)
1382                 return false;
1383
1384         rcu_read_lock();
1385         sta = sta_info_get(sdata, mgd->bssid);
1386         if (sta)
1387                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1388         rcu_read_unlock();
1389
1390         return authorized;
1391 }
1392
1393 /* need to hold RTNL or interface lock */
1394 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1395 {
1396         struct ieee80211_sub_if_data *sdata, *found = NULL;
1397         int count = 0;
1398         int timeout;
1399
1400         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1401                 local->ps_sdata = NULL;
1402                 return;
1403         }
1404
1405         list_for_each_entry(sdata, &local->interfaces, list) {
1406                 if (!ieee80211_sdata_running(sdata))
1407                         continue;
1408                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1409                         /* If an AP vif is found, then disable PS
1410                          * by setting the count to zero thereby setting
1411                          * ps_sdata to NULL.
1412                          */
1413                         count = 0;
1414                         break;
1415                 }
1416                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1417                         continue;
1418                 found = sdata;
1419                 count++;
1420         }
1421
1422         if (count == 1 && ieee80211_powersave_allowed(found)) {
1423                 s32 beaconint_us;
1424
1425                 if (latency < 0)
1426                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1427
1428                 beaconint_us = ieee80211_tu_to_usec(
1429                                         found->vif.bss_conf.beacon_int);
1430
1431                 timeout = local->dynamic_ps_forced_timeout;
1432                 if (timeout < 0) {
1433                         /*
1434                          * Go to full PSM if the user configures a very low
1435                          * latency requirement.
1436                          * The 2000 second value is there for compatibility
1437                          * until the PM_QOS_NETWORK_LATENCY is configured
1438                          * with real values.
1439                          */
1440                         if (latency > (1900 * USEC_PER_MSEC) &&
1441                             latency != (2000 * USEC_PER_SEC))
1442                                 timeout = 0;
1443                         else
1444                                 timeout = 100;
1445                 }
1446                 local->hw.conf.dynamic_ps_timeout = timeout;
1447
1448                 if (beaconint_us > latency) {
1449                         local->ps_sdata = NULL;
1450                 } else {
1451                         int maxslp = 1;
1452                         u8 dtimper = found->u.mgd.dtim_period;
1453
1454                         /* If the TIM IE is invalid, pretend the value is 1 */
1455                         if (!dtimper)
1456                                 dtimper = 1;
1457                         else if (dtimper > 1)
1458                                 maxslp = min_t(int, dtimper,
1459                                                     latency / beaconint_us);
1460
1461                         local->hw.conf.max_sleep_period = maxslp;
1462                         local->hw.conf.ps_dtim_period = dtimper;
1463                         local->ps_sdata = found;
1464                 }
1465         } else {
1466                 local->ps_sdata = NULL;
1467         }
1468
1469         ieee80211_change_ps(local);
1470 }
1471
1472 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1473 {
1474         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1475
1476         if (sdata->vif.bss_conf.ps != ps_allowed) {
1477                 sdata->vif.bss_conf.ps = ps_allowed;
1478                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1479         }
1480 }
1481
1482 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1483 {
1484         struct ieee80211_local *local =
1485                 container_of(work, struct ieee80211_local,
1486                              dynamic_ps_disable_work);
1487
1488         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1489                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1490                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1491         }
1492
1493         ieee80211_wake_queues_by_reason(&local->hw,
1494                                         IEEE80211_MAX_QUEUE_MAP,
1495                                         IEEE80211_QUEUE_STOP_REASON_PS);
1496 }
1497
1498 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1499 {
1500         struct ieee80211_local *local =
1501                 container_of(work, struct ieee80211_local,
1502                              dynamic_ps_enable_work);
1503         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1504         struct ieee80211_if_managed *ifmgd;
1505         unsigned long flags;
1506         int q;
1507
1508         /* can only happen when PS was just disabled anyway */
1509         if (!sdata)
1510                 return;
1511
1512         ifmgd = &sdata->u.mgd;
1513
1514         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1515                 return;
1516
1517         if (local->hw.conf.dynamic_ps_timeout > 0) {
1518                 /* don't enter PS if TX frames are pending */
1519                 if (drv_tx_frames_pending(local)) {
1520                         mod_timer(&local->dynamic_ps_timer, jiffies +
1521                                   msecs_to_jiffies(
1522                                   local->hw.conf.dynamic_ps_timeout));
1523                         return;
1524                 }
1525
1526                 /*
1527                  * transmission can be stopped by others which leads to
1528                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1529                  * is not the actual idle state.
1530                  */
1531                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1532                 for (q = 0; q < local->hw.queues; q++) {
1533                         if (local->queue_stop_reasons[q]) {
1534                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1535                                                        flags);
1536                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1537                                           msecs_to_jiffies(
1538                                           local->hw.conf.dynamic_ps_timeout));
1539                                 return;
1540                         }
1541                 }
1542                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1543         }
1544
1545         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1546             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1547                 if (drv_tx_frames_pending(local)) {
1548                         mod_timer(&local->dynamic_ps_timer, jiffies +
1549                                   msecs_to_jiffies(
1550                                   local->hw.conf.dynamic_ps_timeout));
1551                 } else {
1552                         ieee80211_send_nullfunc(local, sdata, 1);
1553                         /* Flush to get the tx status of nullfunc frame */
1554                         ieee80211_flush_queues(local, sdata);
1555                 }
1556         }
1557
1558         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1559               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1560             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1561                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1562                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1563                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1564         }
1565 }
1566
1567 void ieee80211_dynamic_ps_timer(unsigned long data)
1568 {
1569         struct ieee80211_local *local = (void *) data;
1570
1571         if (local->quiescing || local->suspended)
1572                 return;
1573
1574         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1575 }
1576
1577 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1578 {
1579         struct delayed_work *delayed_work =
1580                 container_of(work, struct delayed_work, work);
1581         struct ieee80211_sub_if_data *sdata =
1582                 container_of(delayed_work, struct ieee80211_sub_if_data,
1583                              dfs_cac_timer_work);
1584
1585         ieee80211_vif_release_channel(sdata);
1586
1587         cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL);
1588 }
1589
1590 /* MLME */
1591 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1592                                      struct ieee80211_sub_if_data *sdata,
1593                                      const u8 *wmm_param, size_t wmm_param_len)
1594 {
1595         struct ieee80211_tx_queue_params params;
1596         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1597         size_t left;
1598         int count;
1599         const u8 *pos;
1600         u8 uapsd_queues = 0;
1601
1602         if (!local->ops->conf_tx)
1603                 return false;
1604
1605         if (local->hw.queues < IEEE80211_NUM_ACS)
1606                 return false;
1607
1608         if (!wmm_param)
1609                 return false;
1610
1611         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1612                 return false;
1613
1614         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1615                 uapsd_queues = ifmgd->uapsd_queues;
1616
1617         count = wmm_param[6] & 0x0f;
1618         if (count == ifmgd->wmm_last_param_set)
1619                 return false;
1620         ifmgd->wmm_last_param_set = count;
1621
1622         pos = wmm_param + 8;
1623         left = wmm_param_len - 8;
1624
1625         memset(&params, 0, sizeof(params));
1626
1627         sdata->wmm_acm = 0;
1628         for (; left >= 4; left -= 4, pos += 4) {
1629                 int aci = (pos[0] >> 5) & 0x03;
1630                 int acm = (pos[0] >> 4) & 0x01;
1631                 bool uapsd = false;
1632                 int queue;
1633
1634                 switch (aci) {
1635                 case 1: /* AC_BK */
1636                         queue = 3;
1637                         if (acm)
1638                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1639                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1640                                 uapsd = true;
1641                         break;
1642                 case 2: /* AC_VI */
1643                         queue = 1;
1644                         if (acm)
1645                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1646                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1647                                 uapsd = true;
1648                         break;
1649                 case 3: /* AC_VO */
1650                         queue = 0;
1651                         if (acm)
1652                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1653                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1654                                 uapsd = true;
1655                         break;
1656                 case 0: /* AC_BE */
1657                 default:
1658                         queue = 2;
1659                         if (acm)
1660                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1661                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1662                                 uapsd = true;
1663                         break;
1664                 }
1665
1666                 params.aifs = pos[0] & 0x0f;
1667                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1668                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1669                 params.txop = get_unaligned_le16(pos + 2);
1670                 params.acm = acm;
1671                 params.uapsd = uapsd;
1672
1673                 mlme_dbg(sdata,
1674                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1675                          queue, aci, acm,
1676                          params.aifs, params.cw_min, params.cw_max,
1677                          params.txop, params.uapsd);
1678                 sdata->tx_conf[queue] = params;
1679                 if (drv_conf_tx(local, sdata, queue, &params))
1680                         sdata_err(sdata,
1681                                   "failed to set TX queue parameters for queue %d\n",
1682                                   queue);
1683         }
1684
1685         /* enable WMM or activate new settings */
1686         sdata->vif.bss_conf.qos = true;
1687         return true;
1688 }
1689
1690 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1691 {
1692         lockdep_assert_held(&sdata->local->mtx);
1693
1694         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1695                                 IEEE80211_STA_BEACON_POLL);
1696         ieee80211_run_deferred_scan(sdata->local);
1697 }
1698
1699 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1700 {
1701         mutex_lock(&sdata->local->mtx);
1702         __ieee80211_stop_poll(sdata);
1703         mutex_unlock(&sdata->local->mtx);
1704 }
1705
1706 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1707                                            u16 capab, bool erp_valid, u8 erp)
1708 {
1709         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1710         u32 changed = 0;
1711         bool use_protection;
1712         bool use_short_preamble;
1713         bool use_short_slot;
1714
1715         if (erp_valid) {
1716                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1717                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1718         } else {
1719                 use_protection = false;
1720                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1721         }
1722
1723         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1724         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1725                 use_short_slot = true;
1726
1727         if (use_protection != bss_conf->use_cts_prot) {
1728                 bss_conf->use_cts_prot = use_protection;
1729                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1730         }
1731
1732         if (use_short_preamble != bss_conf->use_short_preamble) {
1733                 bss_conf->use_short_preamble = use_short_preamble;
1734                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1735         }
1736
1737         if (use_short_slot != bss_conf->use_short_slot) {
1738                 bss_conf->use_short_slot = use_short_slot;
1739                 changed |= BSS_CHANGED_ERP_SLOT;
1740         }
1741
1742         return changed;
1743 }
1744
1745 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1746                                      struct cfg80211_bss *cbss,
1747                                      u32 bss_info_changed)
1748 {
1749         struct ieee80211_bss *bss = (void *)cbss->priv;
1750         struct ieee80211_local *local = sdata->local;
1751         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1752
1753         bss_info_changed |= BSS_CHANGED_ASSOC;
1754         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1755                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1756
1757         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1758                 beacon_loss_count * bss_conf->beacon_int));
1759
1760         sdata->u.mgd.associated = cbss;
1761         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1762
1763         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1764
1765         if (sdata->vif.p2p) {
1766                 const struct cfg80211_bss_ies *ies;
1767
1768                 rcu_read_lock();
1769                 ies = rcu_dereference(cbss->ies);
1770                 if (ies) {
1771                         int ret;
1772
1773                         ret = cfg80211_get_p2p_attr(
1774                                         ies->data, ies->len,
1775                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1776                                         (u8 *) &bss_conf->p2p_noa_attr,
1777                                         sizeof(bss_conf->p2p_noa_attr));
1778                         if (ret >= 2) {
1779                                 sdata->u.mgd.p2p_noa_index =
1780                                         bss_conf->p2p_noa_attr.index;
1781                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1782                         }
1783                 }
1784                 rcu_read_unlock();
1785         }
1786
1787         /* just to be sure */
1788         ieee80211_stop_poll(sdata);
1789
1790         ieee80211_led_assoc(local, 1);
1791
1792         if (sdata->u.mgd.have_beacon) {
1793                 /*
1794                  * If the AP is buggy we may get here with no DTIM period
1795                  * known, so assume it's 1 which is the only safe assumption
1796                  * in that case, although if the TIM IE is broken powersave
1797                  * probably just won't work at all.
1798                  */
1799                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1800                 bss_conf->beacon_rate = bss->beacon_rate;
1801                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1802         } else {
1803                 bss_conf->beacon_rate = NULL;
1804                 bss_conf->dtim_period = 0;
1805         }
1806
1807         bss_conf->assoc = 1;
1808
1809         /* Tell the driver to monitor connection quality (if supported) */
1810         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1811             bss_conf->cqm_rssi_thold)
1812                 bss_info_changed |= BSS_CHANGED_CQM;
1813
1814         /* Enable ARP filtering */
1815         if (bss_conf->arp_addr_cnt)
1816                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1817
1818         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1819
1820         mutex_lock(&local->iflist_mtx);
1821         ieee80211_recalc_ps(local, -1);
1822         mutex_unlock(&local->iflist_mtx);
1823
1824         ieee80211_recalc_smps(sdata);
1825         ieee80211_recalc_ps_vif(sdata);
1826
1827         netif_carrier_on(sdata->dev);
1828 }
1829
1830 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1831                                    u16 stype, u16 reason, bool tx,
1832                                    u8 *frame_buf)
1833 {
1834         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1835         struct ieee80211_local *local = sdata->local;
1836         u32 changed = 0;
1837
1838         sdata_assert_lock(sdata);
1839
1840         if (WARN_ON_ONCE(tx && !frame_buf))
1841                 return;
1842
1843         if (WARN_ON(!ifmgd->associated))
1844                 return;
1845
1846         ieee80211_stop_poll(sdata);
1847
1848         ifmgd->associated = NULL;
1849         netif_carrier_off(sdata->dev);
1850
1851         /*
1852          * if we want to get out of ps before disassoc (why?) we have
1853          * to do it before sending disassoc, as otherwise the null-packet
1854          * won't be valid.
1855          */
1856         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1857                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1858                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1859         }
1860         local->ps_sdata = NULL;
1861
1862         /* disable per-vif ps */
1863         ieee80211_recalc_ps_vif(sdata);
1864
1865         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1866         if (tx)
1867                 ieee80211_flush_queues(local, sdata);
1868
1869         /* deauthenticate/disassociate now */
1870         if (tx || frame_buf)
1871                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1872                                                reason, tx, frame_buf);
1873
1874         /* flush out frame */
1875         if (tx)
1876                 ieee80211_flush_queues(local, sdata);
1877
1878         /* clear bssid only after building the needed mgmt frames */
1879         memset(ifmgd->bssid, 0, ETH_ALEN);
1880
1881         /* remove AP and TDLS peers */
1882         sta_info_flush_defer(sdata);
1883
1884         /* finally reset all BSS / config parameters */
1885         changed |= ieee80211_reset_erp_info(sdata);
1886
1887         ieee80211_led_assoc(local, 0);
1888         changed |= BSS_CHANGED_ASSOC;
1889         sdata->vif.bss_conf.assoc = false;
1890
1891         ifmgd->p2p_noa_index = -1;
1892         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1893                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1894
1895         /* on the next assoc, re-program HT/VHT parameters */
1896         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1897         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1898         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1899         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1900
1901         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1902
1903         del_timer_sync(&local->dynamic_ps_timer);
1904         cancel_work_sync(&local->dynamic_ps_enable_work);
1905
1906         /* Disable ARP filtering */
1907         if (sdata->vif.bss_conf.arp_addr_cnt)
1908                 changed |= BSS_CHANGED_ARP_FILTER;
1909
1910         sdata->vif.bss_conf.qos = false;
1911         changed |= BSS_CHANGED_QOS;
1912
1913         /* The BSSID (not really interesting) and HT changed */
1914         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1915         ieee80211_bss_info_change_notify(sdata, changed);
1916
1917         /* disassociated - set to defaults now */
1918         ieee80211_set_wmm_default(sdata, false);
1919
1920         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1921         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1922         del_timer_sync(&sdata->u.mgd.timer);
1923         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1924
1925         sdata->vif.bss_conf.dtim_period = 0;
1926         sdata->vif.bss_conf.beacon_rate = NULL;
1927
1928         ifmgd->have_beacon = false;
1929
1930         ifmgd->flags = 0;
1931         ieee80211_vif_release_channel(sdata);
1932 }
1933
1934 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1935                              struct ieee80211_hdr *hdr)
1936 {
1937         /*
1938          * We can postpone the mgd.timer whenever receiving unicast frames
1939          * from AP because we know that the connection is working both ways
1940          * at that time. But multicast frames (and hence also beacons) must
1941          * be ignored here, because we need to trigger the timer during
1942          * data idle periods for sending the periodic probe request to the
1943          * AP we're connected to.
1944          */
1945         if (is_multicast_ether_addr(hdr->addr1))
1946                 return;
1947
1948         ieee80211_sta_reset_conn_monitor(sdata);
1949 }
1950
1951 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1952 {
1953         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1954         struct ieee80211_local *local = sdata->local;
1955
1956         mutex_lock(&local->mtx);
1957         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1958                               IEEE80211_STA_CONNECTION_POLL))) {
1959                 mutex_unlock(&local->mtx);
1960                 return;
1961         }
1962
1963         __ieee80211_stop_poll(sdata);
1964
1965         mutex_lock(&local->iflist_mtx);
1966         ieee80211_recalc_ps(local, -1);
1967         mutex_unlock(&local->iflist_mtx);
1968
1969         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1970                 goto out;
1971
1972         /*
1973          * We've received a probe response, but are not sure whether
1974          * we have or will be receiving any beacons or data, so let's
1975          * schedule the timers again, just in case.
1976          */
1977         ieee80211_sta_reset_beacon_monitor(sdata);
1978
1979         mod_timer(&ifmgd->conn_mon_timer,
1980                   round_jiffies_up(jiffies +
1981                                    IEEE80211_CONNECTION_IDLE_TIME));
1982 out:
1983         mutex_unlock(&local->mtx);
1984 }
1985
1986 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1987                              struct ieee80211_hdr *hdr, bool ack)
1988 {
1989         if (!ieee80211_is_data(hdr->frame_control))
1990             return;
1991
1992         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1993             sdata->u.mgd.probe_send_count > 0) {
1994                 if (ack)
1995                         ieee80211_sta_reset_conn_monitor(sdata);
1996                 else
1997                         sdata->u.mgd.nullfunc_failed = true;
1998                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1999                 return;
2000         }
2001
2002         if (ack)
2003                 ieee80211_sta_reset_conn_monitor(sdata);
2004 }
2005
2006 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2007 {
2008         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2009         const u8 *ssid;
2010         u8 *dst = ifmgd->associated->bssid;
2011         u8 unicast_limit = max(1, max_probe_tries - 3);
2012
2013         /*
2014          * Try sending broadcast probe requests for the last three
2015          * probe requests after the first ones failed since some
2016          * buggy APs only support broadcast probe requests.
2017          */
2018         if (ifmgd->probe_send_count >= unicast_limit)
2019                 dst = NULL;
2020
2021         /*
2022          * When the hardware reports an accurate Tx ACK status, it's
2023          * better to send a nullfunc frame instead of a probe request,
2024          * as it will kick us off the AP quickly if we aren't associated
2025          * anymore. The timeout will be reset if the frame is ACKed by
2026          * the AP.
2027          */
2028         ifmgd->probe_send_count++;
2029
2030         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2031                 ifmgd->nullfunc_failed = false;
2032                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2033         } else {
2034                 int ssid_len;
2035
2036                 rcu_read_lock();
2037                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2038                 if (WARN_ON_ONCE(ssid == NULL))
2039                         ssid_len = 0;
2040                 else
2041                         ssid_len = ssid[1];
2042
2043                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
2044                                          0, (u32) -1, true, 0,
2045                                          ifmgd->associated->channel, false);
2046                 rcu_read_unlock();
2047         }
2048
2049         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2050         run_again(sdata, ifmgd->probe_timeout);
2051         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2052                 ieee80211_flush_queues(sdata->local, sdata);
2053 }
2054
2055 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2056                                    bool beacon)
2057 {
2058         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2059         bool already = false;
2060
2061         if (!ieee80211_sdata_running(sdata))
2062                 return;
2063
2064         sdata_lock(sdata);
2065
2066         if (!ifmgd->associated)
2067                 goto out;
2068
2069         mutex_lock(&sdata->local->mtx);
2070
2071         if (sdata->local->tmp_channel || sdata->local->scanning) {
2072                 mutex_unlock(&sdata->local->mtx);
2073                 goto out;
2074         }
2075
2076         if (beacon) {
2077                 mlme_dbg_ratelimited(sdata,
2078                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2079                                      beacon_loss_count);
2080
2081                 ieee80211_cqm_rssi_notify(&sdata->vif,
2082                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
2083                                           GFP_KERNEL);
2084         }
2085
2086         /*
2087          * The driver/our work has already reported this event or the
2088          * connection monitoring has kicked in and we have already sent
2089          * a probe request. Or maybe the AP died and the driver keeps
2090          * reporting until we disassociate...
2091          *
2092          * In either case we have to ignore the current call to this
2093          * function (except for setting the correct probe reason bit)
2094          * because otherwise we would reset the timer every time and
2095          * never check whether we received a probe response!
2096          */
2097         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2098                             IEEE80211_STA_CONNECTION_POLL))
2099                 already = true;
2100
2101         if (beacon)
2102                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
2103         else
2104                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2105
2106         mutex_unlock(&sdata->local->mtx);
2107
2108         if (already)
2109                 goto out;
2110
2111         mutex_lock(&sdata->local->iflist_mtx);
2112         ieee80211_recalc_ps(sdata->local, -1);
2113         mutex_unlock(&sdata->local->iflist_mtx);
2114
2115         ifmgd->probe_send_count = 0;
2116         ieee80211_mgd_probe_ap_send(sdata);
2117  out:
2118         sdata_unlock(sdata);
2119 }
2120
2121 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2122                                           struct ieee80211_vif *vif)
2123 {
2124         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2125         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2126         struct cfg80211_bss *cbss;
2127         struct sk_buff *skb;
2128         const u8 *ssid;
2129         int ssid_len;
2130
2131         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2132                 return NULL;
2133
2134         sdata_assert_lock(sdata);
2135
2136         if (ifmgd->associated)
2137                 cbss = ifmgd->associated;
2138         else if (ifmgd->auth_data)
2139                 cbss = ifmgd->auth_data->bss;
2140         else if (ifmgd->assoc_data)
2141                 cbss = ifmgd->assoc_data->bss;
2142         else
2143                 return NULL;
2144
2145         rcu_read_lock();
2146         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2147         if (WARN_ON_ONCE(ssid == NULL))
2148                 ssid_len = 0;
2149         else
2150                 ssid_len = ssid[1];
2151
2152         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2153                                         (u32) -1, cbss->channel,
2154                                         ssid + 2, ssid_len,
2155                                         NULL, 0, true);
2156         rcu_read_unlock();
2157
2158         return skb;
2159 }
2160 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2161
2162 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2163 {
2164         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2165         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2166
2167         sdata_lock(sdata);
2168         if (!ifmgd->associated) {
2169                 sdata_unlock(sdata);
2170                 return;
2171         }
2172
2173         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2174                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2175                                true, frame_buf);
2176         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2177         ieee80211_wake_queues_by_reason(&sdata->local->hw,
2178                                         IEEE80211_MAX_QUEUE_MAP,
2179                                         IEEE80211_QUEUE_STOP_REASON_CSA);
2180
2181         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2182                               IEEE80211_DEAUTH_FRAME_LEN);
2183         sdata_unlock(sdata);
2184 }
2185
2186 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2187 {
2188         struct ieee80211_sub_if_data *sdata =
2189                 container_of(work, struct ieee80211_sub_if_data,
2190                              u.mgd.beacon_connection_loss_work);
2191         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2192         struct sta_info *sta;
2193
2194         if (ifmgd->associated) {
2195                 rcu_read_lock();
2196                 sta = sta_info_get(sdata, ifmgd->bssid);
2197                 if (sta)
2198                         sta->beacon_loss_count++;
2199                 rcu_read_unlock();
2200         }
2201
2202         if (ifmgd->connection_loss) {
2203                 sdata_info(sdata, "Connection to AP %pM lost\n",
2204                            ifmgd->bssid);
2205                 __ieee80211_disconnect(sdata);
2206         } else {
2207                 ieee80211_mgd_probe_ap(sdata, true);
2208         }
2209 }
2210
2211 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2212 {
2213         struct ieee80211_sub_if_data *sdata =
2214                 container_of(work, struct ieee80211_sub_if_data,
2215                              u.mgd.csa_connection_drop_work);
2216
2217         __ieee80211_disconnect(sdata);
2218 }
2219
2220 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2221 {
2222         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2223         struct ieee80211_hw *hw = &sdata->local->hw;
2224
2225         trace_api_beacon_loss(sdata);
2226
2227         sdata->u.mgd.connection_loss = false;
2228         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2229 }
2230 EXPORT_SYMBOL(ieee80211_beacon_loss);
2231
2232 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2233 {
2234         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2235         struct ieee80211_hw *hw = &sdata->local->hw;
2236
2237         trace_api_connection_loss(sdata);
2238
2239         sdata->u.mgd.connection_loss = true;
2240         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2241 }
2242 EXPORT_SYMBOL(ieee80211_connection_loss);
2243
2244
2245 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2246                                         bool assoc)
2247 {
2248         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2249
2250         sdata_assert_lock(sdata);
2251
2252         if (!assoc) {
2253                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2254
2255                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2256                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2257                 sdata->u.mgd.flags = 0;
2258                 ieee80211_vif_release_channel(sdata);
2259         }
2260
2261         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2262         kfree(auth_data);
2263         sdata->u.mgd.auth_data = NULL;
2264 }
2265
2266 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2267                                      struct ieee80211_mgmt *mgmt, size_t len)
2268 {
2269         struct ieee80211_local *local = sdata->local;
2270         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2271         u8 *pos;
2272         struct ieee802_11_elems elems;
2273         u32 tx_flags = 0;
2274
2275         pos = mgmt->u.auth.variable;
2276         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2277         if (!elems.challenge)
2278                 return;
2279         auth_data->expected_transaction = 4;
2280         drv_mgd_prepare_tx(sdata->local, sdata);
2281         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2282                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2283                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2284         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2285                             elems.challenge - 2, elems.challenge_len + 2,
2286                             auth_data->bss->bssid, auth_data->bss->bssid,
2287                             auth_data->key, auth_data->key_len,
2288                             auth_data->key_idx, tx_flags);
2289 }
2290
2291 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2292                                    struct ieee80211_mgmt *mgmt, size_t len)
2293 {
2294         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2295         u8 bssid[ETH_ALEN];
2296         u16 auth_alg, auth_transaction, status_code;
2297         struct sta_info *sta;
2298
2299         sdata_assert_lock(sdata);
2300
2301         if (len < 24 + 6)
2302                 return;
2303
2304         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2305                 return;
2306
2307         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2308
2309         if (!ether_addr_equal(bssid, mgmt->bssid))
2310                 return;
2311
2312         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2313         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2314         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2315
2316         if (auth_alg != ifmgd->auth_data->algorithm ||
2317             auth_transaction != ifmgd->auth_data->expected_transaction) {
2318                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2319                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2320                            auth_transaction,
2321                            ifmgd->auth_data->expected_transaction);
2322                 return;
2323         }
2324
2325         if (status_code != WLAN_STATUS_SUCCESS) {
2326                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2327                            mgmt->sa, status_code);
2328                 ieee80211_destroy_auth_data(sdata, false);
2329                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2330                 return;
2331         }
2332
2333         switch (ifmgd->auth_data->algorithm) {
2334         case WLAN_AUTH_OPEN:
2335         case WLAN_AUTH_LEAP:
2336         case WLAN_AUTH_FT:
2337         case WLAN_AUTH_SAE:
2338                 break;
2339         case WLAN_AUTH_SHARED_KEY:
2340                 if (ifmgd->auth_data->expected_transaction != 4) {
2341                         ieee80211_auth_challenge(sdata, mgmt, len);
2342                         /* need another frame */
2343                         return;
2344                 }
2345                 break;
2346         default:
2347                 WARN_ONCE(1, "invalid auth alg %d",
2348                           ifmgd->auth_data->algorithm);
2349                 return;
2350         }
2351
2352         sdata_info(sdata, "authenticated\n");
2353         ifmgd->auth_data->done = true;
2354         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2355         ifmgd->auth_data->timeout_started = true;
2356         run_again(sdata, ifmgd->auth_data->timeout);
2357
2358         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2359             ifmgd->auth_data->expected_transaction != 2) {
2360                 /*
2361                  * Report auth frame to user space for processing since another
2362                  * round of Authentication frames is still needed.
2363                  */
2364                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2365                 return;
2366         }
2367
2368         /* move station state to auth */
2369         mutex_lock(&sdata->local->sta_mtx);
2370         sta = sta_info_get(sdata, bssid);
2371         if (!sta) {
2372                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2373                 goto out_err;
2374         }
2375         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2376                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2377                 goto out_err;
2378         }
2379         mutex_unlock(&sdata->local->sta_mtx);
2380
2381         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2382         return;
2383  out_err:
2384         mutex_unlock(&sdata->local->sta_mtx);
2385         /* ignore frame -- wait for timeout */
2386 }
2387
2388
2389 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2390                                      struct ieee80211_mgmt *mgmt, size_t len)
2391 {
2392         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2393         const u8 *bssid = NULL;
2394         u16 reason_code;
2395
2396         sdata_assert_lock(sdata);
2397
2398         if (len < 24 + 2)
2399                 return;
2400
2401         if (!ifmgd->associated ||
2402             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2403                 return;
2404
2405         bssid = ifmgd->associated->bssid;
2406
2407         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2408
2409         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2410                    bssid, reason_code);
2411
2412         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2413
2414         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2415 }
2416
2417
2418 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2419                                        struct ieee80211_mgmt *mgmt, size_t len)
2420 {
2421         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2422         u16 reason_code;
2423
2424         sdata_assert_lock(sdata);
2425
2426         if (len < 24 + 2)
2427                 return;
2428
2429         if (!ifmgd->associated ||
2430             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2431                 return;
2432
2433         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2434
2435         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2436                    mgmt->sa, reason_code);
2437
2438         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2439
2440         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2441 }
2442
2443 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2444                                 u8 *supp_rates, unsigned int supp_rates_len,
2445                                 u32 *rates, u32 *basic_rates,
2446                                 bool *have_higher_than_11mbit,
2447                                 int *min_rate, int *min_rate_index,
2448                                 int shift, u32 rate_flags)
2449 {
2450         int i, j;
2451
2452         for (i = 0; i < supp_rates_len; i++) {
2453                 int rate = supp_rates[i] & 0x7f;
2454                 bool is_basic = !!(supp_rates[i] & 0x80);
2455
2456                 if ((rate * 5 * (1 << shift)) > 110)
2457                         *have_higher_than_11mbit = true;
2458
2459                 /*
2460                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2461                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2462                  *
2463                  * Note: Even through the membership selector and the basic
2464                  *       rate flag share the same bit, they are not exactly
2465                  *       the same.
2466                  */
2467                 if (!!(supp_rates[i] & 0x80) &&
2468                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2469                         continue;
2470
2471                 for (j = 0; j < sband->n_bitrates; j++) {
2472                         struct ieee80211_rate *br;
2473                         int brate;
2474
2475                         br = &sband->bitrates[j];
2476                         if ((rate_flags & br->flags) != rate_flags)
2477                                 continue;
2478
2479                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2480                         if (brate == rate) {
2481                                 *rates |= BIT(j);
2482                                 if (is_basic)
2483                                         *basic_rates |= BIT(j);
2484                                 if ((rate * 5) < *min_rate) {
2485                                         *min_rate = rate * 5;
2486                                         *min_rate_index = j;
2487                                 }
2488                                 break;
2489                         }
2490                 }
2491         }
2492 }
2493
2494 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2495                                          bool assoc)
2496 {
2497         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2498
2499         sdata_assert_lock(sdata);
2500
2501         if (!assoc) {
2502                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2503
2504                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2505                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2506                 sdata->u.mgd.flags = 0;
2507                 ieee80211_vif_release_channel(sdata);
2508         }
2509
2510         kfree(assoc_data);
2511         sdata->u.mgd.assoc_data = NULL;
2512 }
2513
2514 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2515                                     struct cfg80211_bss *cbss,
2516                                     struct ieee80211_mgmt *mgmt, size_t len)
2517 {
2518         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2519         struct ieee80211_local *local = sdata->local;
2520         struct ieee80211_supported_band *sband;
2521         struct sta_info *sta;
2522         u8 *pos;
2523         u16 capab_info, aid;
2524         struct ieee802_11_elems elems;
2525         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2526         const struct cfg80211_bss_ies *bss_ies = NULL;
2527         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2528         u32 changed = 0;
2529         int err;
2530         bool ret;
2531
2532         /* AssocResp and ReassocResp have identical structure */
2533
2534         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2535         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2536
2537         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2538                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2539                            aid);
2540         aid &= ~(BIT(15) | BIT(14));
2541
2542         ifmgd->broken_ap = false;
2543
2544         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2545                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2546                            aid);
2547                 aid = 0;
2548                 ifmgd->broken_ap = true;
2549         }
2550
2551         pos = mgmt->u.assoc_resp.variable;
2552         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2553
2554         if (!elems.supp_rates) {
2555                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2556                 return false;
2557         }
2558
2559         ifmgd->aid = aid;
2560
2561         /*
2562          * Some APs are erroneously not including some information in their
2563          * (re)association response frames. Try to recover by using the data
2564          * from the beacon or probe response. This seems to afflict mobile
2565          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2566          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2567          */
2568         if ((assoc_data->wmm && !elems.wmm_param) ||
2569             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2570              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2571             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2572              (!elems.vht_cap_elem || !elems.vht_operation))) {
2573                 const struct cfg80211_bss_ies *ies;
2574                 struct ieee802_11_elems bss_elems;
2575
2576                 rcu_read_lock();
2577                 ies = rcu_dereference(cbss->ies);
2578                 if (ies)
2579                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2580                                           GFP_ATOMIC);
2581                 rcu_read_unlock();
2582                 if (!bss_ies)
2583                         return false;
2584
2585                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2586                                        false, &bss_elems);
2587                 if (assoc_data->wmm &&
2588                     !elems.wmm_param && bss_elems.wmm_param) {
2589                         elems.wmm_param = bss_elems.wmm_param;
2590                         sdata_info(sdata,
2591                                    "AP bug: WMM param missing from AssocResp\n");
2592                 }
2593
2594                 /*
2595                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2596                  * have to include the IEs in the (re)association response.
2597                  */
2598                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2599                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2600                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2601                         sdata_info(sdata,
2602                                    "AP bug: HT capability missing from AssocResp\n");
2603                 }
2604                 if (!elems.ht_operation && bss_elems.ht_operation &&
2605                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2606                         elems.ht_operation = bss_elems.ht_operation;
2607                         sdata_info(sdata,
2608                                    "AP bug: HT operation missing from AssocResp\n");
2609                 }
2610                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2611                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2612                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2613                         sdata_info(sdata,
2614                                    "AP bug: VHT capa missing from AssocResp\n");
2615                 }
2616                 if (!elems.vht_operation && bss_elems.vht_operation &&
2617                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2618                         elems.vht_operation = bss_elems.vht_operation;
2619                         sdata_info(sdata,
2620                                    "AP bug: VHT operation missing from AssocResp\n");
2621                 }
2622         }
2623
2624         /*
2625          * We previously checked these in the beacon/probe response, so
2626          * they should be present here. This is just a safety net.
2627          */
2628         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2629             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2630                 sdata_info(sdata,
2631                            "HT AP is missing WMM params or HT capability/operation\n");
2632                 ret = false;
2633                 goto out;
2634         }
2635
2636         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2637             (!elems.vht_cap_elem || !elems.vht_operation)) {
2638                 sdata_info(sdata,
2639                            "VHT AP is missing VHT capability/operation\n");
2640                 ret = false;
2641                 goto out;
2642         }
2643
2644         mutex_lock(&sdata->local->sta_mtx);
2645         /*
2646          * station info was already allocated and inserted before
2647          * the association and should be available to us
2648          */
2649         sta = sta_info_get(sdata, cbss->bssid);
2650         if (WARN_ON(!sta)) {
2651                 mutex_unlock(&sdata->local->sta_mtx);
2652                 ret = false;
2653                 goto out;
2654         }
2655
2656         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2657
2658         /* Set up internal HT/VHT capabilities */
2659         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2660                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2661                                                   elems.ht_cap_elem, sta);
2662
2663         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2664                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2665                                                     elems.vht_cap_elem, sta);
2666
2667         /*
2668          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2669          * in their association response, so ignore that data for our own
2670          * configuration. If it changed since the last beacon, we'll get the
2671          * next beacon and update then.
2672          */
2673
2674         /*
2675          * If an operating mode notification IE is present, override the
2676          * NSS calculation (that would be done in rate_control_rate_init())
2677          * and use the # of streams from that element.
2678          */
2679         if (elems.opmode_notif &&
2680             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2681                 u8 nss;
2682
2683                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2684                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2685                 nss += 1;
2686                 sta->sta.rx_nss = nss;
2687         }
2688
2689         rate_control_rate_init(sta);
2690
2691         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2692                 set_sta_flag(sta, WLAN_STA_MFP);
2693
2694         if (elems.wmm_param)
2695                 set_sta_flag(sta, WLAN_STA_WME);
2696
2697         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2698         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2699                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2700         if (err) {
2701                 sdata_info(sdata,
2702                            "failed to move station %pM to desired state\n",
2703                            sta->sta.addr);
2704                 WARN_ON(__sta_info_destroy(sta));
2705                 mutex_unlock(&sdata->local->sta_mtx);
2706                 ret = false;
2707                 goto out;
2708         }
2709
2710         mutex_unlock(&sdata->local->sta_mtx);
2711
2712         /*
2713          * Always handle WMM once after association regardless
2714          * of the first value the AP uses. Setting -1 here has
2715          * that effect because the AP values is an unsigned
2716          * 4-bit value.
2717          */
2718         ifmgd->wmm_last_param_set = -1;
2719
2720         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2721                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2722                                          elems.wmm_param_len);
2723         else
2724                 ieee80211_set_wmm_default(sdata, false);
2725         changed |= BSS_CHANGED_QOS;
2726
2727         /* set AID and assoc capability,
2728          * ieee80211_set_associated() will tell the driver */
2729         bss_conf->aid = aid;
2730         bss_conf->assoc_capability = capab_info;
2731         ieee80211_set_associated(sdata, cbss, changed);
2732
2733         /*
2734          * If we're using 4-addr mode, let the AP know that we're
2735          * doing so, so that it can create the STA VLAN on its side
2736          */
2737         if (ifmgd->use_4addr)
2738                 ieee80211_send_4addr_nullfunc(local, sdata);
2739
2740         /*
2741          * Start timer to probe the connection to the AP now.
2742          * Also start the timer that will detect beacon loss.
2743          */
2744         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2745         ieee80211_sta_reset_beacon_monitor(sdata);
2746
2747         ret = true;
2748  out:
2749         kfree(bss_ies);
2750         return ret;
2751 }
2752
2753 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2754                                          struct ieee80211_mgmt *mgmt,
2755                                          size_t len)
2756 {
2757         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2758         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2759         u16 capab_info, status_code, aid;
2760         struct ieee802_11_elems elems;
2761         u8 *pos;
2762         bool reassoc;
2763         struct cfg80211_bss *bss;
2764
2765         sdata_assert_lock(sdata);
2766
2767         if (!assoc_data)
2768                 return;
2769         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2770                 return;
2771
2772         /*
2773          * AssocResp and ReassocResp have identical structure, so process both
2774          * of them in this function.
2775          */
2776
2777         if (len < 24 + 6)
2778                 return;
2779
2780         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2781         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2782         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2783         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2784
2785         sdata_info(sdata,
2786                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2787                    reassoc ? "Rea" : "A", mgmt->sa,
2788                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2789
2790         pos = mgmt->u.assoc_resp.variable;
2791         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2792
2793         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2794             elems.timeout_int &&
2795             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2796                 u32 tu, ms;
2797                 tu = le32_to_cpu(elems.timeout_int->value);
2798                 ms = tu * 1024 / 1000;
2799                 sdata_info(sdata,
2800                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2801                            mgmt->sa, tu, ms);
2802                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2803                 assoc_data->timeout_started = true;
2804                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2805                         run_again(sdata, assoc_data->timeout);
2806                 return;
2807         }
2808
2809         bss = assoc_data->bss;
2810
2811         if (status_code != WLAN_STATUS_SUCCESS) {
2812                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2813                            mgmt->sa, status_code);
2814                 ieee80211_destroy_assoc_data(sdata, false);
2815         } else {
2816                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2817                         /* oops -- internal error -- send timeout for now */
2818                         ieee80211_destroy_assoc_data(sdata, false);
2819                         cfg80211_assoc_timeout(sdata->dev, bss);
2820                         return;
2821                 }
2822                 sdata_info(sdata, "associated\n");
2823
2824                 /*
2825                  * destroy assoc_data afterwards, as otherwise an idle
2826                  * recalc after assoc_data is NULL but before associated
2827                  * is set can cause the interface to go idle
2828                  */
2829                 ieee80211_destroy_assoc_data(sdata, true);
2830         }
2831
2832         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
2833 }
2834
2835 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2836                                   struct ieee80211_mgmt *mgmt, size_t len,
2837                                   struct ieee80211_rx_status *rx_status,
2838                                   struct ieee802_11_elems *elems)
2839 {
2840         struct ieee80211_local *local = sdata->local;
2841         int freq;
2842         struct ieee80211_bss *bss;
2843         struct ieee80211_channel *channel;
2844
2845         sdata_assert_lock(sdata);
2846
2847         if (elems->ds_params)
2848                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2849                                                       rx_status->band);
2850         else
2851                 freq = rx_status->freq;
2852
2853         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2854
2855         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2856                 return;
2857
2858         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2859                                         channel);
2860         if (bss) {
2861                 ieee80211_rx_bss_put(local, bss);
2862                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2863         }
2864 }
2865
2866
2867 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2868                                          struct sk_buff *skb)
2869 {
2870         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2871         struct ieee80211_if_managed *ifmgd;
2872         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2873         size_t baselen, len = skb->len;
2874         struct ieee802_11_elems elems;
2875
2876         ifmgd = &sdata->u.mgd;
2877
2878         sdata_assert_lock(sdata);
2879
2880         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2881                 return; /* ignore ProbeResp to foreign address */
2882
2883         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2884         if (baselen > len)
2885                 return;
2886
2887         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2888                                false, &elems);
2889
2890         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2891
2892         if (ifmgd->associated &&
2893             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2894                 ieee80211_reset_ap_probe(sdata);
2895
2896         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2897             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2898                 /* got probe response, continue with auth */
2899                 sdata_info(sdata, "direct probe responded\n");
2900                 ifmgd->auth_data->tries = 0;
2901                 ifmgd->auth_data->timeout = jiffies;
2902                 ifmgd->auth_data->timeout_started = true;
2903                 run_again(sdata, ifmgd->auth_data->timeout);
2904         }
2905 }
2906
2907 /*
2908  * This is the canonical list of information elements we care about,
2909  * the filter code also gives us all changes to the Microsoft OUI
2910  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2911  *
2912  * We implement beacon filtering in software since that means we can
2913  * avoid processing the frame here and in cfg80211, and userspace
2914  * will not be able to tell whether the hardware supports it or not.
2915  *
2916  * XXX: This list needs to be dynamic -- userspace needs to be able to
2917  *      add items it requires. It also needs to be able to tell us to
2918  *      look out for other vendor IEs.
2919  */
2920 static const u64 care_about_ies =
2921         (1ULL << WLAN_EID_COUNTRY) |
2922         (1ULL << WLAN_EID_ERP_INFO) |
2923         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2924         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2925         (1ULL << WLAN_EID_HT_CAPABILITY) |
2926         (1ULL << WLAN_EID_HT_OPERATION);
2927
2928 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2929                                      struct ieee80211_mgmt *mgmt, size_t len,
2930                                      struct ieee80211_rx_status *rx_status)
2931 {
2932         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2933         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2934         size_t baselen;
2935         struct ieee802_11_elems elems;
2936         struct ieee80211_local *local = sdata->local;
2937         struct ieee80211_chanctx_conf *chanctx_conf;
2938         struct ieee80211_channel *chan;
2939         struct sta_info *sta;
2940         u32 changed = 0;
2941         bool erp_valid;
2942         u8 erp_value = 0;
2943         u32 ncrc;
2944         u8 *bssid;
2945         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2946
2947         sdata_assert_lock(sdata);
2948
2949         /* Process beacon from the current BSS */
2950         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2951         if (baselen > len)
2952                 return;
2953
2954         rcu_read_lock();
2955         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2956         if (!chanctx_conf) {
2957                 rcu_read_unlock();
2958                 return;
2959         }
2960
2961         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2962                 rcu_read_unlock();
2963                 return;
2964         }
2965         chan = chanctx_conf->def.chan;
2966         rcu_read_unlock();
2967
2968         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2969             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2970                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2971                                        len - baselen, false, &elems);
2972
2973                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2974                 if (elems.tim && !elems.parse_error) {
2975                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
2976                         ifmgd->dtim_period = tim_ie->dtim_period;
2977                 }
2978                 ifmgd->have_beacon = true;
2979                 ifmgd->assoc_data->need_beacon = false;
2980                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2981                         sdata->vif.bss_conf.sync_tsf =
2982                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2983                         sdata->vif.bss_conf.sync_device_ts =
2984                                 rx_status->device_timestamp;
2985                         if (elems.tim)
2986                                 sdata->vif.bss_conf.sync_dtim_count =
2987                                         elems.tim->dtim_count;
2988                         else
2989                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2990                 }
2991                 /* continue assoc process */
2992                 ifmgd->assoc_data->timeout = jiffies;
2993                 ifmgd->assoc_data->timeout_started = true;
2994                 run_again(sdata, ifmgd->assoc_data->timeout);
2995                 return;
2996         }
2997
2998         if (!ifmgd->associated ||
2999             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3000                 return;
3001         bssid = ifmgd->associated->bssid;
3002
3003         /* Track average RSSI from the Beacon frames of the current AP */
3004         ifmgd->last_beacon_signal = rx_status->signal;
3005         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3006                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3007                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3008                 ifmgd->last_cqm_event_signal = 0;
3009                 ifmgd->count_beacon_signal = 1;
3010                 ifmgd->last_ave_beacon_signal = 0;
3011         } else {
3012                 ifmgd->ave_beacon_signal =
3013                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3014                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3015                          ifmgd->ave_beacon_signal) / 16;
3016                 ifmgd->count_beacon_signal++;
3017         }
3018
3019         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3020             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3021                 int sig = ifmgd->ave_beacon_signal;
3022                 int last_sig = ifmgd->last_ave_beacon_signal;
3023
3024                 /*
3025                  * if signal crosses either of the boundaries, invoke callback
3026                  * with appropriate parameters
3027                  */
3028                 if (sig > ifmgd->rssi_max_thold &&
3029                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3030                         ifmgd->last_ave_beacon_signal = sig;
3031                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3032                 } else if (sig < ifmgd->rssi_min_thold &&
3033                            (last_sig >= ifmgd->rssi_max_thold ||
3034                            last_sig == 0)) {
3035                         ifmgd->last_ave_beacon_signal = sig;
3036                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3037                 }
3038         }
3039
3040         if (bss_conf->cqm_rssi_thold &&
3041             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3042             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3043                 int sig = ifmgd->ave_beacon_signal / 16;
3044                 int last_event = ifmgd->last_cqm_event_signal;
3045                 int thold = bss_conf->cqm_rssi_thold;
3046                 int hyst = bss_conf->cqm_rssi_hyst;
3047                 if (sig < thold &&
3048                     (last_event == 0 || sig < last_event - hyst)) {
3049                         ifmgd->last_cqm_event_signal = sig;
3050                         ieee80211_cqm_rssi_notify(
3051                                 &sdata->vif,
3052                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3053                                 GFP_KERNEL);
3054                 } else if (sig > thold &&
3055                            (last_event == 0 || sig > last_event + hyst)) {
3056                         ifmgd->last_cqm_event_signal = sig;
3057                         ieee80211_cqm_rssi_notify(
3058                                 &sdata->vif,
3059                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3060                                 GFP_KERNEL);
3061                 }
3062         }
3063
3064         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
3065                 mlme_dbg_ratelimited(sdata,
3066                                      "cancelling AP probe due to a received beacon\n");
3067                 mutex_lock(&local->mtx);
3068                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
3069                 ieee80211_run_deferred_scan(local);
3070                 mutex_unlock(&local->mtx);
3071
3072                 mutex_lock(&local->iflist_mtx);
3073                 ieee80211_recalc_ps(local, -1);
3074                 mutex_unlock(&local->iflist_mtx);
3075         }
3076
3077         /*
3078          * Push the beacon loss detection into the future since
3079          * we are processing a beacon from the AP just now.
3080          */
3081         ieee80211_sta_reset_beacon_monitor(sdata);
3082
3083         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3084         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3085                                           len - baselen, false, &elems,
3086                                           care_about_ies, ncrc);
3087
3088         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3089                 bool directed_tim = ieee80211_check_tim(elems.tim,
3090                                                         elems.tim_len,
3091                                                         ifmgd->aid);
3092                 if (directed_tim) {
3093                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3094                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3095                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3096                                         ieee80211_hw_config(local,
3097                                                             IEEE80211_CONF_CHANGE_PS);
3098                                 }
3099                                 ieee80211_send_nullfunc(local, sdata, 0);
3100                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3101                                 local->pspolling = true;
3102
3103                                 /*
3104                                  * Here is assumed that the driver will be
3105                                  * able to send ps-poll frame and receive a
3106                                  * response even though power save mode is
3107                                  * enabled, but some drivers might require
3108                                  * to disable power save here. This needs
3109                                  * to be investigated.
3110                                  */
3111                                 ieee80211_send_pspoll(local, sdata);
3112                         }
3113                 }
3114         }
3115
3116         if (sdata->vif.p2p) {
3117                 struct ieee80211_p2p_noa_attr noa = {};
3118                 int ret;
3119
3120                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3121                                             len - baselen,
3122                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3123                                             (u8 *) &noa, sizeof(noa));
3124                 if (ret >= 2) {
3125                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3126                                 /* valid noa_attr and index changed */
3127                                 sdata->u.mgd.p2p_noa_index = noa.index;
3128                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3129                                 changed |= BSS_CHANGED_P2P_PS;
3130                                 /*
3131                                  * make sure we update all information, the CRC
3132                                  * mechanism doesn't look at P2P attributes.
3133                                  */
3134                                 ifmgd->beacon_crc_valid = false;
3135                         }
3136                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3137                         /* noa_attr not found and we had valid noa_attr before */
3138                         sdata->u.mgd.p2p_noa_index = -1;
3139                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3140                         changed |= BSS_CHANGED_P2P_PS;
3141                         ifmgd->beacon_crc_valid = false;
3142                 }
3143         }
3144
3145         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3146                 return;
3147         ifmgd->beacon_crc = ncrc;
3148         ifmgd->beacon_crc_valid = true;
3149
3150         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3151
3152         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3153                                          &elems, true);
3154
3155         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3156             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3157                                      elems.wmm_param_len))
3158                 changed |= BSS_CHANGED_QOS;
3159
3160         /*
3161          * If we haven't had a beacon before, tell the driver about the
3162          * DTIM period (and beacon timing if desired) now.
3163          */
3164         if (!ifmgd->have_beacon) {
3165                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3166                 if (elems.tim)
3167                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3168                 else
3169                         bss_conf->dtim_period = 1;
3170
3171                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3172                         sdata->vif.bss_conf.sync_tsf =
3173                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3174                         sdata->vif.bss_conf.sync_device_ts =
3175                                 rx_status->device_timestamp;
3176                         if (elems.tim)
3177                                 sdata->vif.bss_conf.sync_dtim_count =
3178                                         elems.tim->dtim_count;
3179                         else
3180                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3181                 }
3182
3183                 changed |= BSS_CHANGED_BEACON_INFO;
3184                 ifmgd->have_beacon = true;
3185
3186                 mutex_lock(&local->iflist_mtx);
3187                 ieee80211_recalc_ps(local, -1);
3188                 mutex_unlock(&local->iflist_mtx);
3189
3190                 ieee80211_recalc_ps_vif(sdata);
3191         }
3192
3193         if (elems.erp_info) {
3194                 erp_valid = true;
3195                 erp_value = elems.erp_info[0];
3196         } else {
3197                 erp_valid = false;
3198         }
3199         changed |= ieee80211_handle_bss_capability(sdata,
3200                         le16_to_cpu(mgmt->u.beacon.capab_info),
3201                         erp_valid, erp_value);
3202
3203         mutex_lock(&local->sta_mtx);
3204         sta = sta_info_get(sdata, bssid);
3205
3206         if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3207                                 elems.vht_operation, bssid, &changed)) {
3208                 mutex_unlock(&local->sta_mtx);
3209                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3210                                        WLAN_REASON_DEAUTH_LEAVING,
3211                                        true, deauth_buf);
3212                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3213                                       sizeof(deauth_buf));
3214                 return;
3215         }
3216
3217         if (sta && elems.opmode_notif)
3218                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3219                                             rx_status->band, true);
3220         mutex_unlock(&local->sta_mtx);
3221
3222         if (elems.country_elem && elems.pwr_constr_elem &&
3223             mgmt->u.probe_resp.capab_info &
3224                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3225                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3226                                                        elems.country_elem,
3227                                                        elems.country_elem_len,
3228                                                        elems.pwr_constr_elem);
3229
3230         ieee80211_bss_info_change_notify(sdata, changed);
3231 }
3232
3233 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3234                                   struct sk_buff *skb)
3235 {
3236         struct ieee80211_rx_status *rx_status;
3237         struct ieee80211_mgmt *mgmt;
3238         u16 fc;
3239         struct ieee802_11_elems elems;
3240         int ies_len;
3241
3242         rx_status = (struct ieee80211_rx_status *) skb->cb;
3243         mgmt = (struct ieee80211_mgmt *) skb->data;
3244         fc = le16_to_cpu(mgmt->frame_control);
3245
3246         sdata_lock(sdata);
3247
3248         switch (fc & IEEE80211_FCTL_STYPE) {
3249         case IEEE80211_STYPE_BEACON:
3250                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3251                 break;
3252         case IEEE80211_STYPE_PROBE_RESP:
3253                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3254                 break;
3255         case IEEE80211_STYPE_AUTH:
3256                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3257                 break;
3258         case IEEE80211_STYPE_DEAUTH:
3259                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3260                 break;
3261         case IEEE80211_STYPE_DISASSOC:
3262                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3263                 break;
3264         case IEEE80211_STYPE_ASSOC_RESP:
3265         case IEEE80211_STYPE_REASSOC_RESP:
3266                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3267                 break;
3268         case IEEE80211_STYPE_ACTION:
3269                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3270                         ies_len = skb->len -
3271                                   offsetof(struct ieee80211_mgmt,
3272                                            u.action.u.chan_switch.variable);
3273
3274                         if (ies_len < 0)
3275                                 break;
3276
3277                         ieee802_11_parse_elems(
3278                                 mgmt->u.action.u.chan_switch.variable,
3279                                 ies_len, true, &elems);
3280
3281                         if (elems.parse_error)
3282                                 break;
3283
3284                         ieee80211_sta_process_chanswitch(sdata,
3285                                                          rx_status->mactime,
3286                                                          &elems, false);
3287                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3288                         ies_len = skb->len -
3289                                   offsetof(struct ieee80211_mgmt,
3290                                            u.action.u.ext_chan_switch.variable);
3291
3292                         if (ies_len < 0)
3293                                 break;
3294
3295                         ieee802_11_parse_elems(
3296                                 mgmt->u.action.u.ext_chan_switch.variable,
3297                                 ies_len, true, &elems);
3298
3299                         if (elems.parse_error)
3300                                 break;
3301
3302                         /* for the handling code pretend this was also an IE */
3303                         elems.ext_chansw_ie =
3304                                 &mgmt->u.action.u.ext_chan_switch.data;
3305
3306                         ieee80211_sta_process_chanswitch(sdata,
3307                                                          rx_status->mactime,
3308                                                          &elems, false);
3309                 }
3310                 break;
3311         }
3312         sdata_unlock(sdata);
3313 }
3314
3315 static void ieee80211_sta_timer(unsigned long data)
3316 {
3317         struct ieee80211_sub_if_data *sdata =
3318                 (struct ieee80211_sub_if_data *) data;
3319
3320         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3321 }
3322
3323 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3324                                           u8 *bssid, u8 reason, bool tx)
3325 {
3326         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3327
3328         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3329                                tx, frame_buf);
3330
3331         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3332                               IEEE80211_DEAUTH_FRAME_LEN);
3333 }
3334
3335 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3336 {
3337         struct ieee80211_local *local = sdata->local;
3338         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3339         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3340         u32 tx_flags = 0;
3341
3342         sdata_assert_lock(sdata);
3343
3344         if (WARN_ON_ONCE(!auth_data))
3345                 return -EINVAL;
3346
3347         auth_data->tries++;
3348
3349         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3350                 sdata_info(sdata, "authentication with %pM timed out\n",
3351                            auth_data->bss->bssid);
3352
3353                 /*
3354                  * Most likely AP is not in the range so remove the
3355                  * bss struct for that AP.
3356                  */
3357                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3358
3359                 return -ETIMEDOUT;
3360         }
3361
3362         drv_mgd_prepare_tx(local, sdata);
3363
3364         if (auth_data->bss->proberesp_ies) {
3365                 u16 trans = 1;
3366                 u16 status = 0;
3367
3368                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3369                            auth_data->bss->bssid, auth_data->tries,
3370                            IEEE80211_AUTH_MAX_TRIES);
3371
3372                 auth_data->expected_transaction = 2;
3373
3374                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3375                         trans = auth_data->sae_trans;
3376                         status = auth_data->sae_status;
3377                         auth_data->expected_transaction = trans;
3378                 }
3379
3380                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3381                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3382                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3383
3384                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3385                                     auth_data->data, auth_data->data_len,
3386                                     auth_data->bss->bssid,
3387                                     auth_data->bss->bssid, NULL, 0, 0,
3388                                     tx_flags);
3389         } else {
3390                 const u8 *ssidie;
3391
3392                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3393                            auth_data->bss->bssid, auth_data->tries,
3394                            IEEE80211_AUTH_MAX_TRIES);
3395
3396                 rcu_read_lock();
3397                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3398                 if (!ssidie) {
3399                         rcu_read_unlock();
3400                         return -EINVAL;
3401                 }
3402                 /*
3403                  * Direct probe is sent to broadcast address as some APs
3404                  * will not answer to direct packet in unassociated state.
3405                  */
3406                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3407                                          NULL, 0, (u32) -1, true, 0,
3408                                          auth_data->bss->channel, false);
3409                 rcu_read_unlock();
3410         }
3411
3412         if (tx_flags == 0) {
3413                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3414                 auth_data->timeout_started = true;
3415                 run_again(sdata, auth_data->timeout);
3416         } else {
3417                 auth_data->timeout =
3418                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3419                 auth_data->timeout_started = true;
3420                 run_again(sdata, auth_data->timeout);
3421         }
3422
3423         return 0;
3424 }
3425
3426 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3427 {
3428         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3429         struct ieee80211_local *local = sdata->local;
3430
3431         sdata_assert_lock(sdata);
3432
3433         assoc_data->tries++;
3434         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3435                 sdata_info(sdata, "association with %pM timed out\n",
3436                            assoc_data->bss->bssid);
3437
3438                 /*
3439                  * Most likely AP is not in the range so remove the
3440                  * bss struct for that AP.
3441                  */
3442                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3443
3444                 return -ETIMEDOUT;
3445         }
3446
3447         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3448                    assoc_data->bss->bssid, assoc_data->tries,
3449                    IEEE80211_ASSOC_MAX_TRIES);
3450         ieee80211_send_assoc(sdata);
3451
3452         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3453                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3454                 assoc_data->timeout_started = true;
3455                 run_again(sdata, assoc_data->timeout);
3456         } else {
3457                 assoc_data->timeout =
3458                         round_jiffies_up(jiffies +
3459                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3460                 assoc_data->timeout_started = true;
3461                 run_again(sdata, assoc_data->timeout);
3462         }
3463
3464         return 0;
3465 }
3466
3467 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3468                                   __le16 fc, bool acked)
3469 {
3470         struct ieee80211_local *local = sdata->local;
3471
3472         sdata->u.mgd.status_fc = fc;
3473         sdata->u.mgd.status_acked = acked;
3474         sdata->u.mgd.status_received = true;
3475
3476         ieee80211_queue_work(&local->hw, &sdata->work);
3477 }
3478
3479 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3480 {
3481         struct ieee80211_local *local = sdata->local;
3482         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3483
3484         sdata_lock(sdata);
3485
3486         if (ifmgd->status_received) {
3487                 __le16 fc = ifmgd->status_fc;
3488                 bool status_acked = ifmgd->status_acked;
3489
3490                 ifmgd->status_received = false;
3491                 if (ifmgd->auth_data &&
3492                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3493                         if (status_acked) {
3494                                 ifmgd->auth_data->timeout =
3495                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3496                                 run_again(sdata, ifmgd->auth_data->timeout);
3497                         } else {
3498                                 ifmgd->auth_data->timeout = jiffies - 1;
3499                         }
3500                         ifmgd->auth_data->timeout_started = true;
3501                 } else if (ifmgd->assoc_data &&
3502                            (ieee80211_is_assoc_req(fc) ||
3503                             ieee80211_is_reassoc_req(fc))) {
3504                         if (status_acked) {
3505                                 ifmgd->assoc_data->timeout =
3506                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3507                                 run_again(sdata, ifmgd->assoc_data->timeout);
3508                         } else {
3509                                 ifmgd->assoc_data->timeout = jiffies - 1;
3510                         }
3511                         ifmgd->assoc_data->timeout_started = true;
3512                 }
3513         }
3514
3515         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3516             time_after(jiffies, ifmgd->auth_data->timeout)) {
3517                 if (ifmgd->auth_data->done) {
3518                         /*
3519                          * ok ... we waited for assoc but userspace didn't,
3520                          * so let's just kill the auth data
3521                          */
3522                         ieee80211_destroy_auth_data(sdata, false);
3523                 } else if (ieee80211_probe_auth(sdata)) {
3524                         u8 bssid[ETH_ALEN];
3525
3526                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3527
3528                         ieee80211_destroy_auth_data(sdata, false);
3529
3530                         cfg80211_auth_timeout(sdata->dev, bssid);
3531                 }
3532         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3533                 run_again(sdata, ifmgd->auth_data->timeout);
3534
3535         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3536             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3537                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3538                     ieee80211_do_assoc(sdata)) {
3539                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3540
3541                         ieee80211_destroy_assoc_data(sdata, false);
3542                         cfg80211_assoc_timeout(sdata->dev, bss);
3543                 }
3544         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3545                 run_again(sdata, ifmgd->assoc_data->timeout);
3546
3547         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
3548                             IEEE80211_STA_CONNECTION_POLL) &&
3549             ifmgd->associated) {
3550                 u8 bssid[ETH_ALEN];
3551                 int max_tries;
3552
3553                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3554
3555                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3556                         max_tries = max_nullfunc_tries;
3557                 else
3558                         max_tries = max_probe_tries;
3559
3560                 /* ACK received for nullfunc probing frame */
3561                 if (!ifmgd->probe_send_count)
3562                         ieee80211_reset_ap_probe(sdata);
3563                 else if (ifmgd->nullfunc_failed) {
3564                         if (ifmgd->probe_send_count < max_tries) {
3565                                 mlme_dbg(sdata,
3566                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3567                                          bssid, ifmgd->probe_send_count,
3568                                          max_tries);
3569                                 ieee80211_mgd_probe_ap_send(sdata);
3570                         } else {
3571                                 mlme_dbg(sdata,
3572                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3573                                          bssid);
3574                                 ieee80211_sta_connection_lost(sdata, bssid,
3575                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3576                                         false);
3577                         }
3578                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3579                         run_again(sdata, ifmgd->probe_timeout);
3580                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3581                         mlme_dbg(sdata,
3582                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3583                                  bssid, probe_wait_ms);
3584                         ieee80211_sta_connection_lost(sdata, bssid,
3585                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3586                 } else if (ifmgd->probe_send_count < max_tries) {
3587                         mlme_dbg(sdata,
3588                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3589                                  bssid, probe_wait_ms,
3590                                  ifmgd->probe_send_count, max_tries);
3591                         ieee80211_mgd_probe_ap_send(sdata);
3592                 } else {
3593                         /*
3594                          * We actually lost the connection ... or did we?
3595                          * Let's make sure!
3596                          */
3597                         wiphy_debug(local->hw.wiphy,
3598                                     "%s: No probe response from AP %pM"
3599                                     " after %dms, disconnecting.\n",
3600                                     sdata->name,
3601                                     bssid, probe_wait_ms);
3602
3603                         ieee80211_sta_connection_lost(sdata, bssid,
3604                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3605                 }
3606         }
3607
3608         sdata_unlock(sdata);
3609 }
3610
3611 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3612 {
3613         struct ieee80211_sub_if_data *sdata =
3614                 (struct ieee80211_sub_if_data *) data;
3615         struct ieee80211_local *local = sdata->local;
3616
3617         if (local->quiescing)
3618                 return;
3619
3620         sdata->u.mgd.connection_loss = false;
3621         ieee80211_queue_work(&sdata->local->hw,
3622                              &sdata->u.mgd.beacon_connection_loss_work);
3623 }
3624
3625 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3626 {
3627         struct ieee80211_sub_if_data *sdata =
3628                 (struct ieee80211_sub_if_data *) data;
3629         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3630         struct ieee80211_local *local = sdata->local;
3631
3632         if (local->quiescing)
3633                 return;
3634
3635         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3636 }
3637
3638 static void ieee80211_sta_monitor_work(struct work_struct *work)
3639 {
3640         struct ieee80211_sub_if_data *sdata =
3641                 container_of(work, struct ieee80211_sub_if_data,
3642                              u.mgd.monitor_work);
3643
3644         ieee80211_mgd_probe_ap(sdata, false);
3645 }
3646
3647 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3648 {
3649         u32 flags;
3650
3651         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3652                 __ieee80211_stop_poll(sdata);
3653
3654                 /* let's probe the connection once */
3655                 flags = sdata->local->hw.flags;
3656                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3657                         ieee80211_queue_work(&sdata->local->hw,
3658                                              &sdata->u.mgd.monitor_work);
3659                 /* and do all the other regular work too */
3660                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3661         }
3662 }
3663
3664 #ifdef CONFIG_PM
3665 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3666 {
3667         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3668
3669         sdata_lock(sdata);
3670         if (!ifmgd->associated) {
3671                 sdata_unlock(sdata);
3672                 return;
3673         }
3674
3675         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3676                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3677                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3678                 ieee80211_sta_connection_lost(sdata,
3679                                               ifmgd->associated->bssid,
3680                                               WLAN_REASON_UNSPECIFIED,
3681                                               true);
3682                 sdata_unlock(sdata);
3683                 return;
3684         }
3685         sdata_unlock(sdata);
3686 }
3687 #endif
3688
3689 /* interface setup */
3690 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3691 {
3692         struct ieee80211_if_managed *ifmgd;
3693
3694         ifmgd = &sdata->u.mgd;
3695         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3696         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3697         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3698                   ieee80211_beacon_connection_loss_work);
3699         INIT_WORK(&ifmgd->csa_connection_drop_work,
3700                   ieee80211_csa_connection_drop_work);
3701         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3702         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3703                     (unsigned long) sdata);
3704         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3705                     (unsigned long) sdata);
3706         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3707                     (unsigned long) sdata);
3708         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3709                     (unsigned long) sdata);
3710
3711         ifmgd->flags = 0;
3712         ifmgd->powersave = sdata->wdev.ps;
3713         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3714         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3715         ifmgd->p2p_noa_index = -1;
3716
3717         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3718                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3719         else
3720                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3721 }
3722
3723 /* scan finished notification */
3724 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3725 {
3726         struct ieee80211_sub_if_data *sdata;
3727
3728         /* Restart STA timers */
3729         rcu_read_lock();
3730         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3731                 if (ieee80211_sdata_running(sdata))
3732                         ieee80211_restart_sta_timer(sdata);
3733         }
3734         rcu_read_unlock();
3735 }
3736
3737 int ieee80211_max_network_latency(struct notifier_block *nb,
3738                                   unsigned long data, void *dummy)
3739 {
3740         s32 latency_usec = (s32) data;
3741         struct ieee80211_local *local =
3742                 container_of(nb, struct ieee80211_local,
3743                              network_latency_notifier);
3744
3745         mutex_lock(&local->iflist_mtx);
3746         ieee80211_recalc_ps(local, latency_usec);
3747         mutex_unlock(&local->iflist_mtx);
3748
3749         return 0;
3750 }
3751
3752 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3753                                      struct cfg80211_bss *cbss)
3754 {
3755         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3756         const u8 *ht_cap_ie, *vht_cap_ie;
3757         const struct ieee80211_ht_cap *ht_cap;
3758         const struct ieee80211_vht_cap *vht_cap;
3759         u8 chains = 1;
3760
3761         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3762                 return chains;
3763
3764         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3765         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3766                 ht_cap = (void *)(ht_cap_ie + 2);
3767                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3768                 /*
3769                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3770                  *       "Tx Unequal Modulation Supported" fields.
3771                  */
3772         }
3773
3774         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3775                 return chains;
3776
3777         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3778         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3779                 u8 nss;
3780                 u16 tx_mcs_map;
3781
3782                 vht_cap = (void *)(vht_cap_ie + 2);
3783                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3784                 for (nss = 8; nss > 0; nss--) {
3785                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3786                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3787                                 break;
3788                 }
3789                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3790                 chains = max(chains, nss);
3791         }
3792
3793         return chains;
3794 }
3795
3796 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3797                                   struct cfg80211_bss *cbss)
3798 {
3799         struct ieee80211_local *local = sdata->local;
3800         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3801         const struct ieee80211_ht_operation *ht_oper = NULL;
3802         const struct ieee80211_vht_operation *vht_oper = NULL;
3803         struct ieee80211_supported_band *sband;
3804         struct cfg80211_chan_def chandef;
3805         int ret;
3806
3807         sband = local->hw.wiphy->bands[cbss->channel->band];
3808
3809         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3810                           IEEE80211_STA_DISABLE_80P80MHZ |
3811                           IEEE80211_STA_DISABLE_160MHZ);
3812
3813         rcu_read_lock();
3814
3815         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3816             sband->ht_cap.ht_supported) {
3817                 const u8 *ht_oper_ie, *ht_cap;
3818
3819                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3820                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3821                         ht_oper = (void *)(ht_oper_ie + 2);
3822
3823                 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3824                 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3825                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3826                         ht_oper = NULL;
3827                 }
3828         }
3829
3830         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3831             sband->vht_cap.vht_supported) {
3832                 const u8 *vht_oper_ie, *vht_cap;
3833
3834                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3835                                                    WLAN_EID_VHT_OPERATION);
3836                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3837                         vht_oper = (void *)(vht_oper_ie + 2);
3838                 if (vht_oper && !ht_oper) {
3839                         vht_oper = NULL;
3840                         sdata_info(sdata,
3841                                    "AP advertised VHT without HT, disabling both\n");
3842                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3843                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3844                 }
3845
3846                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3847                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3848                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3849                         vht_oper = NULL;
3850                 }
3851         }
3852
3853         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3854                                                      cbss->channel,
3855                                                      ht_oper, vht_oper,
3856                                                      &chandef, false);
3857
3858         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3859                                       local->rx_chains);
3860
3861         rcu_read_unlock();
3862
3863         /* will change later if needed */
3864         sdata->smps_mode = IEEE80211_SMPS_OFF;
3865
3866         /*
3867          * If this fails (possibly due to channel context sharing
3868          * on incompatible channels, e.g. 80+80 and 160 sharing the
3869          * same control channel) try to use a smaller bandwidth.
3870          */
3871         ret = ieee80211_vif_use_channel(sdata, &chandef,
3872                                         IEEE80211_CHANCTX_SHARED);
3873
3874         /* don't downgrade for 5 and 10 MHz channels, though. */
3875         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3876             chandef.width == NL80211_CHAN_WIDTH_10)
3877                 return ret;
3878
3879         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3880                 ifmgd->flags |= chandef_downgrade(&chandef);
3881                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3882                                                 IEEE80211_CHANCTX_SHARED);
3883         }
3884         return ret;
3885 }
3886
3887 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3888                                      struct cfg80211_bss *cbss, bool assoc)
3889 {
3890         struct ieee80211_local *local = sdata->local;
3891         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3892         struct ieee80211_bss *bss = (void *)cbss->priv;
3893         struct sta_info *new_sta = NULL;
3894         bool have_sta = false;
3895         int err;
3896
3897         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3898                 return -EINVAL;
3899
3900         if (assoc) {
3901                 rcu_read_lock();
3902                 have_sta = sta_info_get(sdata, cbss->bssid);
3903                 rcu_read_unlock();
3904         }
3905
3906         if (!have_sta) {
3907                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3908                 if (!new_sta)
3909                         return -ENOMEM;
3910         }
3911         if (new_sta) {
3912                 u32 rates = 0, basic_rates = 0;
3913                 bool have_higher_than_11mbit;
3914                 int min_rate = INT_MAX, min_rate_index = -1;
3915                 struct ieee80211_chanctx_conf *chanctx_conf;
3916                 struct ieee80211_supported_band *sband;
3917                 const struct cfg80211_bss_ies *ies;
3918                 int shift;
3919                 u32 rate_flags;
3920
3921                 sband = local->hw.wiphy->bands[cbss->channel->band];
3922
3923                 err = ieee80211_prep_channel(sdata, cbss);
3924                 if (err) {
3925                         sta_info_free(local, new_sta);
3926                         return -EINVAL;
3927                 }
3928                 shift = ieee80211_vif_get_shift(&sdata->vif);
3929
3930                 rcu_read_lock();
3931                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3932                 if (WARN_ON(!chanctx_conf)) {
3933                         rcu_read_unlock();
3934                         return -EINVAL;
3935                 }
3936                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
3937                 rcu_read_unlock();
3938
3939                 ieee80211_get_rates(sband, bss->supp_rates,
3940                                     bss->supp_rates_len,
3941                                     &rates, &basic_rates,
3942                                     &have_higher_than_11mbit,
3943                                     &min_rate, &min_rate_index,
3944                                     shift, rate_flags);
3945
3946                 /*
3947                  * This used to be a workaround for basic rates missing
3948                  * in the association response frame. Now that we no
3949                  * longer use the basic rates from there, it probably
3950                  * doesn't happen any more, but keep the workaround so
3951                  * in case some *other* APs are buggy in different ways
3952                  * we can connect -- with a warning.
3953                  */
3954                 if (!basic_rates && min_rate_index >= 0) {
3955                         sdata_info(sdata,
3956                                    "No basic rates, using min rate instead\n");
3957                         basic_rates = BIT(min_rate_index);
3958                 }
3959
3960                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3961                 sdata->vif.bss_conf.basic_rates = basic_rates;
3962
3963                 /* cf. IEEE 802.11 9.2.12 */
3964                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3965                     have_higher_than_11mbit)
3966                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3967                 else
3968                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3969
3970                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3971
3972                 /* set timing information */
3973                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3974                 rcu_read_lock();
3975                 ies = rcu_dereference(cbss->beacon_ies);
3976                 if (ies) {
3977                         const u8 *tim_ie;
3978
3979                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3980                         sdata->vif.bss_conf.sync_device_ts =
3981                                 bss->device_ts_beacon;
3982                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3983                                                   ies->data, ies->len);
3984                         if (tim_ie && tim_ie[1] >= 2)
3985                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
3986                         else
3987                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3988                 } else if (!(local->hw.flags &
3989                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
3990                         ies = rcu_dereference(cbss->proberesp_ies);
3991                         /* must be non-NULL since beacon IEs were NULL */
3992                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3993                         sdata->vif.bss_conf.sync_device_ts =
3994                                 bss->device_ts_presp;
3995                         sdata->vif.bss_conf.sync_dtim_count = 0;
3996                 } else {
3997                         sdata->vif.bss_conf.sync_tsf = 0;
3998                         sdata->vif.bss_conf.sync_device_ts = 0;
3999                         sdata->vif.bss_conf.sync_dtim_count = 0;
4000                 }
4001                 rcu_read_unlock();
4002
4003                 /* tell driver about BSSID, basic rates and timing */
4004                 ieee80211_bss_info_change_notify(sdata,
4005                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4006                         BSS_CHANGED_BEACON_INT);
4007
4008                 if (assoc)
4009                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4010
4011                 err = sta_info_insert(new_sta);
4012                 new_sta = NULL;
4013                 if (err) {
4014                         sdata_info(sdata,
4015                                    "failed to insert STA entry for the AP (error %d)\n",
4016                                    err);
4017                         return err;
4018                 }
4019         } else
4020                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4021
4022         return 0;
4023 }
4024
4025 /* config hooks */
4026 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4027                        struct cfg80211_auth_request *req)
4028 {
4029         struct ieee80211_local *local = sdata->local;
4030         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4031         struct ieee80211_mgd_auth_data *auth_data;
4032         u16 auth_alg;
4033         int err;
4034
4035         /* prepare auth data structure */
4036
4037         switch (req->auth_type) {
4038         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4039                 auth_alg = WLAN_AUTH_OPEN;
4040                 break;
4041         case NL80211_AUTHTYPE_SHARED_KEY:
4042                 if (IS_ERR(local->wep_tx_tfm))
4043                         return -EOPNOTSUPP;
4044                 auth_alg = WLAN_AUTH_SHARED_KEY;
4045                 break;
4046         case NL80211_AUTHTYPE_FT:
4047                 auth_alg = WLAN_AUTH_FT;
4048                 break;
4049         case NL80211_AUTHTYPE_NETWORK_EAP:
4050                 auth_alg = WLAN_AUTH_LEAP;
4051                 break;
4052         case NL80211_AUTHTYPE_SAE:
4053                 auth_alg = WLAN_AUTH_SAE;
4054                 break;
4055         default:
4056                 return -EOPNOTSUPP;
4057         }
4058
4059         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4060                             req->ie_len, GFP_KERNEL);
4061         if (!auth_data)
4062                 return -ENOMEM;
4063
4064         auth_data->bss = req->bss;
4065
4066         if (req->sae_data_len >= 4) {
4067                 __le16 *pos = (__le16 *) req->sae_data;
4068                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4069                 auth_data->sae_status = le16_to_cpu(pos[1]);
4070                 memcpy(auth_data->data, req->sae_data + 4,
4071                        req->sae_data_len - 4);
4072                 auth_data->data_len += req->sae_data_len - 4;
4073         }
4074
4075         if (req->ie && req->ie_len) {
4076                 memcpy(&auth_data->data[auth_data->data_len],
4077                        req->ie, req->ie_len);
4078                 auth_data->data_len += req->ie_len;
4079         }
4080
4081         if (req->key && req->key_len) {
4082                 auth_data->key_len = req->key_len;
4083                 auth_data->key_idx = req->key_idx;
4084                 memcpy(auth_data->key, req->key, req->key_len);
4085         }
4086
4087         auth_data->algorithm = auth_alg;
4088
4089         /* try to authenticate/probe */
4090
4091         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4092             ifmgd->assoc_data) {
4093                 err = -EBUSY;
4094                 goto err_free;
4095         }
4096
4097         if (ifmgd->auth_data)
4098                 ieee80211_destroy_auth_data(sdata, false);
4099
4100         /* prep auth_data so we don't go into idle on disassoc */
4101         ifmgd->auth_data = auth_data;
4102
4103         if (ifmgd->associated) {
4104                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4105
4106                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4107                                        WLAN_REASON_UNSPECIFIED,
4108                                        false, frame_buf);
4109
4110                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4111                                       sizeof(frame_buf));
4112         }
4113
4114         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4115
4116         err = ieee80211_prep_connection(sdata, req->bss, false);
4117         if (err)
4118                 goto err_clear;
4119
4120         err = ieee80211_probe_auth(sdata);
4121         if (err) {
4122                 sta_info_destroy_addr(sdata, req->bss->bssid);
4123                 goto err_clear;
4124         }
4125
4126         /* hold our own reference */
4127         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4128         return 0;
4129
4130  err_clear:
4131         memset(ifmgd->bssid, 0, ETH_ALEN);
4132         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4133         ifmgd->auth_data = NULL;
4134  err_free:
4135         kfree(auth_data);
4136         return err;
4137 }
4138
4139 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4140                                         const u8 *wmm_param, int len)
4141 {
4142         const u8 *pos;
4143         size_t left;
4144
4145         if (len < 8)
4146                 return false;
4147
4148         if (wmm_param[5] != 1 /* version */)
4149                 return false;
4150
4151         pos = wmm_param + 8;
4152         left = len - 8;
4153
4154         for (; left >= 4; left -= 4, pos += 4) {
4155                 u8 aifsn = pos[0] & 0x0f;
4156                 u8 ecwmin = pos[1] & 0x0f;
4157                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4158                 int aci = (pos[0] >> 5) & 0x03;
4159
4160                 if (aifsn < 2) {
4161                         sdata_info(sdata,
4162                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4163                                    aifsn, aci);
4164                         return false;
4165                 }
4166                 if (ecwmin > ecwmax) {
4167                         sdata_info(sdata,
4168                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4169                                    ecwmin, ecwmax, aci);
4170                         return false;
4171                 }
4172         }
4173
4174         return true;
4175 }
4176
4177 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4178                         struct cfg80211_assoc_request *req)
4179 {
4180         struct ieee80211_local *local = sdata->local;
4181         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4182         struct ieee80211_bss *bss = (void *)req->bss->priv;
4183         struct ieee80211_mgd_assoc_data *assoc_data;
4184         const struct cfg80211_bss_ies *beacon_ies;
4185         struct ieee80211_supported_band *sband;
4186         const u8 *ssidie, *ht_ie, *vht_ie;
4187         int i, err;
4188
4189         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4190         if (!assoc_data)
4191                 return -ENOMEM;
4192
4193         rcu_read_lock();
4194         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4195         if (!ssidie) {
4196                 rcu_read_unlock();
4197                 kfree(assoc_data);
4198                 return -EINVAL;
4199         }
4200         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4201         assoc_data->ssid_len = ssidie[1];
4202         rcu_read_unlock();
4203
4204         if (ifmgd->associated) {
4205                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4206
4207                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4208                                        WLAN_REASON_UNSPECIFIED,
4209                                        false, frame_buf);
4210
4211                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4212                                       sizeof(frame_buf));
4213         }
4214
4215         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4216                 err = -EBUSY;
4217                 goto err_free;
4218         }
4219
4220         if (ifmgd->assoc_data) {
4221                 err = -EBUSY;
4222                 goto err_free;
4223         }
4224
4225         if (ifmgd->auth_data) {
4226                 bool match;
4227
4228                 /* keep sta info, bssid if matching */
4229                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4230                 ieee80211_destroy_auth_data(sdata, match);
4231         }
4232
4233         /* prepare assoc data */
4234
4235         ifmgd->beacon_crc_valid = false;
4236
4237         assoc_data->wmm = bss->wmm_used &&
4238                           (local->hw.queues >= IEEE80211_NUM_ACS);
4239         if (assoc_data->wmm) {
4240                 /* try to check validity of WMM params IE */
4241                 const struct cfg80211_bss_ies *ies;
4242                 const u8 *wp, *start, *end;
4243
4244                 rcu_read_lock();
4245                 ies = rcu_dereference(req->bss->ies);
4246                 start = ies->data;
4247                 end = start + ies->len;
4248
4249                 while (true) {
4250                         wp = cfg80211_find_vendor_ie(
4251                                 WLAN_OUI_MICROSOFT,
4252                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4253                                 start, end - start);
4254                         if (!wp)
4255                                 break;
4256                         start = wp + wp[1] + 2;
4257                         /* if this IE is too short, try the next */
4258                         if (wp[1] <= 4)
4259                                 continue;
4260                         /* if this IE is WMM params, we found what we wanted */
4261                         if (wp[6] == 1)
4262                                 break;
4263                 }
4264
4265                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4266                                                         wp[1] - 2)) {
4267                         assoc_data->wmm = false;
4268                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4269                 }
4270                 rcu_read_unlock();
4271         }
4272
4273         /*
4274          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4275          * We still associate in non-HT mode (11a/b/g) if any one of these
4276          * ciphers is configured as pairwise.
4277          * We can set this to true for non-11n hardware, that'll be checked
4278          * separately along with the peer capabilities.
4279          */
4280         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4281                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4282                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4283                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4284                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4285                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4286                         netdev_info(sdata->dev,
4287                                     "disabling HT/VHT due to WEP/TKIP use\n");
4288                 }
4289         }
4290
4291         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4292                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4293                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4294         }
4295
4296         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4297                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4298
4299         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4300         sband = local->hw.wiphy->bands[req->bss->channel->band];
4301         if (!sband->ht_cap.ht_supported ||
4302             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4303             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4304                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4305                 if (!bss->wmm_used &&
4306                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4307                         netdev_info(sdata->dev,
4308                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4309         }
4310
4311         /* disable VHT if we don't support it or the AP doesn't use WMM */
4312         if (!sband->vht_cap.vht_supported ||
4313             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4314             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4315                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4316                 if (!bss->wmm_used &&
4317                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4318                         netdev_info(sdata->dev,
4319                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4320         }
4321
4322         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4323         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4324                sizeof(ifmgd->ht_capa_mask));
4325
4326         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4327         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4328                sizeof(ifmgd->vht_capa_mask));
4329
4330         if (req->ie && req->ie_len) {
4331                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4332                 assoc_data->ie_len = req->ie_len;
4333         }
4334
4335         assoc_data->bss = req->bss;
4336
4337         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4338                 if (ifmgd->powersave)
4339                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4340                 else
4341                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4342         } else
4343                 sdata->smps_mode = ifmgd->req_smps;
4344
4345         assoc_data->capability = req->bss->capability;
4346         assoc_data->supp_rates = bss->supp_rates;
4347         assoc_data->supp_rates_len = bss->supp_rates_len;
4348
4349         rcu_read_lock();
4350         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4351         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4352                 assoc_data->ap_ht_param =
4353                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4354         else
4355                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4356         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4357         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4358                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4359                        sizeof(struct ieee80211_vht_cap));
4360         else
4361                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4362         rcu_read_unlock();
4363
4364         if (bss->wmm_used && bss->uapsd_supported &&
4365             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
4366             sdata->wmm_acm != 0xff) {
4367                 assoc_data->uapsd = true;
4368                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4369         } else {
4370                 assoc_data->uapsd = false;
4371                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4372         }
4373
4374         if (req->prev_bssid)
4375                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4376
4377         if (req->use_mfp) {
4378                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4379                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4380         } else {
4381                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4382                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4383         }
4384
4385         if (req->crypto.control_port)
4386                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4387         else
4388                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4389
4390         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4391         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4392
4393         /* kick off associate process */
4394
4395         ifmgd->assoc_data = assoc_data;
4396         ifmgd->dtim_period = 0;
4397         ifmgd->have_beacon = false;
4398
4399         err = ieee80211_prep_connection(sdata, req->bss, true);
4400         if (err)
4401                 goto err_clear;
4402
4403         rcu_read_lock();
4404         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4405
4406         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4407             !beacon_ies) {
4408                 /*
4409                  * Wait up to one beacon interval ...
4410                  * should this be more if we miss one?
4411                  */
4412                 sdata_info(sdata, "waiting for beacon from %pM\n",
4413                            ifmgd->bssid);
4414                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4415                 assoc_data->timeout_started = true;
4416                 assoc_data->need_beacon = true;
4417         } else if (beacon_ies) {
4418                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4419                                                     beacon_ies->data,
4420                                                     beacon_ies->len);
4421                 u8 dtim_count = 0;
4422
4423                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4424                         const struct ieee80211_tim_ie *tim;
4425                         tim = (void *)(tim_ie + 2);
4426                         ifmgd->dtim_period = tim->dtim_period;
4427                         dtim_count = tim->dtim_count;
4428                 }
4429                 ifmgd->have_beacon = true;
4430                 assoc_data->timeout = jiffies;
4431                 assoc_data->timeout_started = true;
4432
4433                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4434                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4435                         sdata->vif.bss_conf.sync_device_ts =
4436                                 bss->device_ts_beacon;
4437                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4438                 }
4439         } else {
4440                 assoc_data->timeout = jiffies;
4441                 assoc_data->timeout_started = true;
4442         }
4443         rcu_read_unlock();
4444
4445         run_again(sdata, assoc_data->timeout);
4446
4447         if (bss->corrupt_data) {
4448                 char *corrupt_type = "data";
4449                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4450                         if (bss->corrupt_data &
4451                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4452                                 corrupt_type = "beacon and probe response";
4453                         else
4454                                 corrupt_type = "beacon";
4455                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4456                         corrupt_type = "probe response";
4457                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4458                            corrupt_type);
4459         }
4460
4461         return 0;
4462  err_clear:
4463         memset(ifmgd->bssid, 0, ETH_ALEN);
4464         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4465         ifmgd->assoc_data = NULL;
4466  err_free:
4467         kfree(assoc_data);
4468         return err;
4469 }
4470
4471 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4472                          struct cfg80211_deauth_request *req)
4473 {
4474         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4475         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4476         bool tx = !req->local_state_change;
4477         bool report_frame = false;
4478
4479         sdata_info(sdata,
4480                    "deauthenticating from %pM by local choice (reason=%d)\n",
4481                    req->bssid, req->reason_code);
4482
4483         if (ifmgd->auth_data) {
4484                 drv_mgd_prepare_tx(sdata->local, sdata);
4485                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4486                                                IEEE80211_STYPE_DEAUTH,
4487                                                req->reason_code, tx,
4488                                                frame_buf);
4489                 ieee80211_destroy_auth_data(sdata, false);
4490
4491                 report_frame = true;
4492                 goto out;
4493         }
4494
4495         if (ifmgd->associated &&
4496             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4497                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4498                                        req->reason_code, tx, frame_buf);
4499                 report_frame = true;
4500         }
4501
4502  out:
4503         if (report_frame)
4504                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4505                                       IEEE80211_DEAUTH_FRAME_LEN);
4506
4507         return 0;
4508 }
4509
4510 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4511                            struct cfg80211_disassoc_request *req)
4512 {
4513         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4514         u8 bssid[ETH_ALEN];
4515         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4516
4517         /*
4518          * cfg80211 should catch this ... but it's racy since
4519          * we can receive a disassoc frame, process it, hand it
4520          * to cfg80211 while that's in a locked section already
4521          * trying to tell us that the user wants to disconnect.
4522          */
4523         if (ifmgd->associated != req->bss)
4524                 return -ENOLINK;
4525
4526         sdata_info(sdata,
4527                    "disassociating from %pM by local choice (reason=%d)\n",
4528                    req->bss->bssid, req->reason_code);
4529
4530         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4531         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4532                                req->reason_code, !req->local_state_change,
4533                                frame_buf);
4534
4535         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4536                               IEEE80211_DEAUTH_FRAME_LEN);
4537
4538         return 0;
4539 }
4540
4541 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4542 {
4543         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4544
4545         /*
4546          * Make sure some work items will not run after this,
4547          * they will not do anything but might not have been
4548          * cancelled when disconnecting.
4549          */
4550         cancel_work_sync(&ifmgd->monitor_work);
4551         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4552         cancel_work_sync(&ifmgd->request_smps_work);
4553         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4554         cancel_work_sync(&ifmgd->chswitch_work);
4555
4556         sdata_lock(sdata);
4557         if (ifmgd->assoc_data) {
4558                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4559                 ieee80211_destroy_assoc_data(sdata, false);
4560                 cfg80211_assoc_timeout(sdata->dev, bss);
4561         }
4562         if (ifmgd->auth_data)
4563                 ieee80211_destroy_auth_data(sdata, false);
4564         del_timer_sync(&ifmgd->timer);
4565         sdata_unlock(sdata);
4566 }
4567
4568 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4569                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4570                                gfp_t gfp)
4571 {
4572         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4573
4574         trace_api_cqm_rssi_notify(sdata, rssi_event);
4575
4576         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4577 }
4578 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);