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_SHORT    (HZ / 10)
  35 #define IEEE80211_AUTH_MAX_TRIES        3
  36 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  37 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  38 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  39 #define IEEE80211_ASSOC_MAX_TRIES       3
  40
  41 static int max_nullfunc_tries = 2;
  42 module_param(max_nullfunc_tries, int, 0644);
  43 MODULE_PARM_DESC(max_nullfunc_tries,
  44                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  45
  46 static int max_probe_tries = 5;
  47 module_param(max_probe_tries, int, 0644);
  48 MODULE_PARM_DESC(max_probe_tries,
  49                  "Maximum probe tries before disconnecting (reason 4).");
  50
  51 /*
  52  * Beacon loss timeout is calculated as N frames times the
  53  * advertised beacon interval.  This may need to be somewhat
  54  * higher than what hardware might detect to account for
  55  * delays in the host processing frames. But since we also
  56  * probe on beacon miss before declaring the connection lost
  57  * default to what we want.
  58  */
  59 #define IEEE80211_BEACON_LOSS_COUNT     7
  60
  61 /*
  62  * Time the connection can be idle before we probe
  63  * it to see if we can still talk to the AP.
  64  */
  65 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  66 /*
  67  * Time we wait for a probe response after sending
  68  * a probe request because of beacon loss or for
  69  * checking the connection still works.
  70  */
  71 static int probe_wait_ms = 500;
  72 module_param(probe_wait_ms, int, 0644);
  73 MODULE_PARM_DESC(probe_wait_ms,
  74                  "Maximum time(ms) to wait for probe response"
  75                  " before disconnecting (reason 4).");
  76
  77 /*
  78  * Weight given to the latest Beacon frame when calculating average signal
  79  * strength for Beacon frames received in the current BSS. This must be
  80  * between 1 and 15.
  81  */
  82 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  83
  84 /*
  85  * How many Beacon frames need to have been used in average signal strength
  86  * before starting to indicate signal change events.
  87  */
  88 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  89
  90 #define TMR_RUNNING_TIMER       0
  91 #define TMR_RUNNING_CHANSW      1
  92
  93 /*
  94  * All cfg80211 functions have to be called outside a locked
  95  * section so that they can acquire a lock themselves... This
  96  * is much simpler than queuing up things in cfg80211, but we
  97  * do need some indirection for that here.
  98  */
  99 enum rx_mgmt_action {
 100         /* no action required */
 101         RX_MGMT_NONE,
 102
 103         /* caller must call cfg80211_send_deauth() */
 104         RX_MGMT_CFG80211_DEAUTH,
 105
 106         /* caller must call cfg80211_send_disassoc() */
 107         RX_MGMT_CFG80211_DISASSOC,
 108
 109         /* caller must call cfg80211_send_rx_auth() */
 110         RX_MGMT_CFG80211_RX_AUTH,
 111
 112         /* caller must call cfg80211_send_rx_assoc() */
 113         RX_MGMT_CFG80211_RX_ASSOC,
 114
 115         /* caller must call cfg80211_send_assoc_timeout() */
 116         RX_MGMT_CFG80211_ASSOC_TIMEOUT,
 117
 118         /* used when a processed beacon causes a deauth */
 119         RX_MGMT_CFG80211_TX_DEAUTH,
 120 };
 121
 122 /* utils */
 123 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 124 {
 125         lockdep_assert_held(&ifmgd->mtx);
 126 }
 127
 128 /*
 129  * We can have multiple work items (and connection probing)
 130  * scheduling this timer, but we need to take care to only
 131  * reschedule it when it should fire _earlier_ than it was
 132  * asked for before, or if it's not pending right now. This
 133  * function ensures that. Note that it then is required to
 134  * run this function for all timeouts after the first one
 135  * has happened -- the work that runs from this timer will
 136  * do that.
 137  */
 138 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
 139 {
 140         ASSERT_MGD_MTX(ifmgd);
 141
 142         if (!timer_pending(&ifmgd->timer) ||
 143             time_before(timeout, ifmgd->timer.expires))
 144                 mod_timer(&ifmgd->timer, timeout);
 145 }
 146
 147 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 148 {
 149         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 150                 return;
 151
 152         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 153                 return;
 154
 155         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 156                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 157 }
 158
 159 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 160 {
 161         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 162
 163         if (unlikely(!sdata->u.mgd.associated))
 164                 return;
 165
 166         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 167                 return;
 168
 169         mod_timer(&sdata->u.mgd.conn_mon_timer,
 170                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 171
 172         ifmgd->probe_send_count = 0;
 173 }
 174
 175 static int ecw2cw(int ecw)
 176 {
 177         return (1 << ecw) - 1;
 178 }
 179
 180 static u32 chandef_downgrade(struct cfg80211_chan_def *c)
 181 {
 182         u32 ret;
 183         int tmp;
 184
 185         switch (c->width) {
 186         case NL80211_CHAN_WIDTH_20:
 187                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
 188                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 189                 break;
 190         case NL80211_CHAN_WIDTH_40:
 191                 c->width = NL80211_CHAN_WIDTH_20;
 192                 c->center_freq1 = c->chan->center_freq;
 193                 ret = IEEE80211_STA_DISABLE_40MHZ |
 194                       IEEE80211_STA_DISABLE_VHT;
 195                 break;
 196         case NL80211_CHAN_WIDTH_80:
 197                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
 198                 /* n_P40 */
 199                 tmp /= 2;
 200                 /* freq_P40 */
 201                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
 202                 c->width = NL80211_CHAN_WIDTH_40;
 203                 ret = IEEE80211_STA_DISABLE_VHT;
 204                 break;
 205         case NL80211_CHAN_WIDTH_80P80:
 206                 c->center_freq2 = 0;
 207                 c->width = NL80211_CHAN_WIDTH_80;
 208                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
 209                       IEEE80211_STA_DISABLE_160MHZ;
 210                 break;
 211         case NL80211_CHAN_WIDTH_160:
 212                 /* n_P20 */
 213                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
 214                 /* n_P80 */
 215                 tmp /= 4;
 216                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
 217                 c->width = NL80211_CHAN_WIDTH_80;
 218                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
 219                       IEEE80211_STA_DISABLE_160MHZ;
 220                 break;
 221         default:
 222         case NL80211_CHAN_WIDTH_20_NOHT:
 223                 WARN_ON_ONCE(1);
 224                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
 225                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 226                 break;
 227         }
 228
 229         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
 230
 231         return ret;
 232 }
 233
 234 static u32
 235 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 236                              struct ieee80211_supported_band *sband,
 237                              struct ieee80211_channel *channel,
 238                              const struct ieee80211_ht_operation *ht_oper,
 239                              const struct ieee80211_vht_operation *vht_oper,
 240                              struct cfg80211_chan_def *chandef, bool verbose)
 241 {
 242         struct cfg80211_chan_def vht_chandef;
 243         u32 ht_cfreq, ret;
 244
 245         chandef->chan = channel;
 246         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 247         chandef->center_freq1 = channel->center_freq;
 248         chandef->center_freq2 = 0;
 249
 250         if (!ht_oper || !sband->ht_cap.ht_supported) {
 251                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 252                 goto out;
 253         }
 254
 255         chandef->width = NL80211_CHAN_WIDTH_20;
 256
 257         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 258                                                   channel->band);
 259         /* check that channel matches the right operating channel */
 260         if (channel->center_freq != ht_cfreq) {
 261                 /*
 262                  * It's possible that some APs are confused here;
 263                  * Netgear WNDR3700 sometimes reports 4 higher than
 264                  * the actual channel in association responses, but
 265                  * since we look at probe response/beacon data here
 266                  * it should be OK.
 267                  */
 268                 if (verbose)
 269                         sdata_info(sdata,
 270                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 271                                    channel->center_freq, ht_cfreq,
 272                                    ht_oper->primary_chan, channel->band);
 273                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 274                 goto out;
 275         }
 276
 277         /* check 40 MHz support, if we have it */
 278         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 279                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 280                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 281                         chandef->width = NL80211_CHAN_WIDTH_40;
 282                         chandef->center_freq1 += 10;
 283                         break;
 284                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 285                         chandef->width = NL80211_CHAN_WIDTH_40;
 286                         chandef->center_freq1 -= 10;
 287                         break;
 288                 }
 289         } else {
 290                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 291                 ret = IEEE80211_STA_DISABLE_VHT;
 292                 goto out;
 293         }
 294
 295         if (!vht_oper || !sband->vht_cap.vht_supported) {
 296                 ret = IEEE80211_STA_DISABLE_VHT;
 297                 goto out;
 298         }
 299
 300         vht_chandef.chan = channel;
 301         vht_chandef.center_freq1 =
 302                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 303                                                channel->band);
 304         vht_chandef.center_freq2 = 0;
 305
 306         if (vht_oper->center_freq_seg2_idx)
 307                 vht_chandef.center_freq2 =
 308                         ieee80211_channel_to_frequency(
 309                                 vht_oper->center_freq_seg2_idx,
 310                                 channel->band);
 311
 312         switch (vht_oper->chan_width) {
 313         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 314                 vht_chandef.width = chandef->width;
 315                 break;
 316         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 317                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 318                 break;
 319         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 320                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 321                 break;
 322         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 323                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 324                 break;
 325         default:
 326                 if (verbose)
 327                         sdata_info(sdata,
 328                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 329                                    vht_oper->chan_width);
 330                 ret = IEEE80211_STA_DISABLE_VHT;
 331                 goto out;
 332         }
 333
 334         if (!cfg80211_chandef_valid(&vht_chandef)) {
 335                 if (verbose)
 336                         sdata_info(sdata,
 337                                    "AP VHT information is invalid, disable VHT\n");
 338                 ret = IEEE80211_STA_DISABLE_VHT;
 339                 goto out;
 340         }
 341
 342         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 343                 ret = 0;
 344                 goto out;
 345         }
 346
 347         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 348                 if (verbose)
 349                         sdata_info(sdata,
 350                                    "AP VHT information doesn't match HT, disable VHT\n");
 351                 ret = IEEE80211_STA_DISABLE_VHT;
 352                 goto out;
 353         }
 354
 355         *chandef = vht_chandef;
 356
 357         ret = 0;
 358
 359 out:
 360         /* don't print the message below for VHT mismatch if VHT is disabled */
 361         if (ret & IEEE80211_STA_DISABLE_VHT)
 362                 vht_chandef = *chandef;
 363
 364         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 365                                         IEEE80211_CHAN_DISABLED)) {
 366                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 367                         ret = IEEE80211_STA_DISABLE_HT |
 368                               IEEE80211_STA_DISABLE_VHT;
 369                         goto out;
 370                 }
 371
 372                 ret |= chandef_downgrade(chandef);
 373         }
 374
 375         if (chandef->width != vht_chandef.width && verbose)
 376                 sdata_info(sdata,
 377                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 378
 379         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 380         return ret;
 381 }
 382
 383 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 384                                struct sta_info *sta,
 385                                const struct ieee80211_ht_operation *ht_oper,
 386                                const struct ieee80211_vht_operation *vht_oper,
 387                                const u8 *bssid, u32 *changed)
 388 {
 389         struct ieee80211_local *local = sdata->local;
 390         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 391         struct ieee80211_supported_band *sband;
 392         struct ieee80211_channel *chan;
 393         struct cfg80211_chan_def chandef;
 394         u16 ht_opmode;
 395         u32 flags;
 396         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 397         int ret;
 398
 399         /* if HT was/is disabled, don't track any bandwidth changes */
 400         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 401                 return 0;
 402
 403         /* don't check VHT if we associated as non-VHT station */
 404         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 405                 vht_oper = NULL;
 406
 407         if (WARN_ON_ONCE(!sta))
 408                 return -EINVAL;
 409
 410         chan = sdata->vif.bss_conf.chandef.chan;
 411         sband = local->hw.wiphy->bands[chan->band];
 412
 413         /* calculate new channel (type) based on HT/VHT operation IEs */
 414         flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
 415                                              vht_oper, &chandef, false);
 416
 417         /*
 418          * Downgrade the new channel if we associated with restricted
 419          * capabilities. For example, if we associated as a 20 MHz STA
 420          * to a 40 MHz AP (due to regulatory, capabilities or config
 421          * reasons) then switching to a 40 MHz channel now won't do us
 422          * any good -- we couldn't use it with the AP.
 423          */
 424         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 425             chandef.width == NL80211_CHAN_WIDTH_80P80)
 426                 flags |= chandef_downgrade(&chandef);
 427         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 428             chandef.width == NL80211_CHAN_WIDTH_160)
 429                 flags |= chandef_downgrade(&chandef);
 430         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 431             chandef.width > NL80211_CHAN_WIDTH_20)
 432                 flags |= chandef_downgrade(&chandef);
 433
 434         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 435                 return 0;
 436
 437         sdata_info(sdata,
 438                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 439                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 440                    chandef.center_freq1, chandef.center_freq2);
 441
 442         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 443                                       IEEE80211_STA_DISABLE_VHT |
 444                                       IEEE80211_STA_DISABLE_40MHZ |
 445                                       IEEE80211_STA_DISABLE_80P80MHZ |
 446                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 447             !cfg80211_chandef_valid(&chandef)) {
 448                 sdata_info(sdata,
 449                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 450                            ifmgd->bssid);
 451                 return -EINVAL;
 452         }
 453
 454         switch (chandef.width) {
 455         case NL80211_CHAN_WIDTH_20_NOHT:
 456         case NL80211_CHAN_WIDTH_20:
 457                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 458                 break;
 459         case NL80211_CHAN_WIDTH_40:
 460                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 461                 break;
 462         case NL80211_CHAN_WIDTH_80:
 463                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 464                 break;
 465         case NL80211_CHAN_WIDTH_80P80:
 466         case NL80211_CHAN_WIDTH_160:
 467                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 468                 break;
 469         default:
 470                 return -EINVAL;
 471         }
 472
 473         if (new_sta_bw > sta->cur_max_bandwidth)
 474                 new_sta_bw = sta->cur_max_bandwidth;
 475
 476         if (new_sta_bw < sta->sta.bandwidth) {
 477                 sta->sta.bandwidth = new_sta_bw;
 478                 rate_control_rate_update(local, sband, sta,
 479                                          IEEE80211_RC_BW_CHANGED);
 480         }
 481
 482         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 483         if (ret) {
 484                 sdata_info(sdata,
 485                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 486                            ifmgd->bssid);
 487                 return ret;
 488         }
 489
 490         if (new_sta_bw > sta->sta.bandwidth) {
 491                 sta->sta.bandwidth = new_sta_bw;
 492                 rate_control_rate_update(local, sband, sta,
 493                                          IEEE80211_RC_BW_CHANGED);
 494         }
 495
 496         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 497
 498         /* if bss configuration changed store the new one */
 499         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 500                 *changed |= BSS_CHANGED_HT;
 501                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 502         }
 503
 504         return 0;
 505 }
 506
 507 /* frame sending functions */
 508
 509 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 510                                       struct ieee80211_supported_band *sband,
 511                                       u32 *rates)
 512 {
 513         int i, j, count;
 514         *rates = 0;
 515         count = 0;
 516         for (i = 0; i < supp_rates_len; i++) {
 517                 int rate = (supp_rates[i] & 0x7F) * 5;
 518
 519                 for (j = 0; j < sband->n_bitrates; j++)
 520                         if (sband->bitrates[j].bitrate == rate) {
 521                                 *rates |= BIT(j);
 522                                 count++;
 523                                 break;
 524                         }
 525         }
 526
 527         return count;
 528 }
 529
 530 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 531                                 struct sk_buff *skb, u8 ap_ht_param,
 532                                 struct ieee80211_supported_band *sband,
 533                                 struct ieee80211_channel *channel,
 534                                 enum ieee80211_smps_mode smps)
 535 {
 536         u8 *pos;
 537         u32 flags = channel->flags;
 538         u16 cap;
 539         struct ieee80211_sta_ht_cap ht_cap;
 540
 541         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 542
 543         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 544         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 545
 546         /* determine capability flags */
 547         cap = ht_cap.cap;
 548
 549         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 550         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 551                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 552                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 553                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 554                 }
 555                 break;
 556         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 557                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 558                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 559                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 560                 }
 561                 break;
 562         }
 563
 564         /*
 565          * If 40 MHz was disabled associate as though we weren't
 566          * capable of 40 MHz -- some broken APs will never fall
 567          * back to trying to transmit in 20 MHz.
 568          */
 569         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 570                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 571                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 572         }
 573
 574         /* set SM PS mode properly */
 575         cap &= ~IEEE80211_HT_CAP_SM_PS;
 576         switch (smps) {
 577         case IEEE80211_SMPS_AUTOMATIC:
 578         case IEEE80211_SMPS_NUM_MODES:
 579                 WARN_ON(1);
 580         case IEEE80211_SMPS_OFF:
 581                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 582                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 583                 break;
 584         case IEEE80211_SMPS_STATIC:
 585                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 586                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 587                 break;
 588         case IEEE80211_SMPS_DYNAMIC:
 589                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 590                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 591                 break;
 592         }
 593
 594         /* reserve and fill IE */
 595         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 596         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 597 }
 598
 599 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 600                                  struct sk_buff *skb,
 601                                  struct ieee80211_supported_band *sband,
 602                                  struct ieee80211_vht_cap *ap_vht_cap)
 603 {
 604         u8 *pos;
 605         u32 cap;
 606         struct ieee80211_sta_vht_cap vht_cap;
 607         int i;
 608
 609         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 610
 611         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 612
 613         /* determine capability flags */
 614         cap = vht_cap.cap;
 615
 616         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 617                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 618                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 619         }
 620
 621         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 622                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 623                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 624         }
 625
 626         /*
 627          * Some APs apparently get confused if our capabilities are better
 628          * than theirs, so restrict what we advertise in the assoc request.
 629          */
 630         if (!(ap_vht_cap->vht_cap_info &
 631                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 632                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 633
 634         if (!(ap_vht_cap->vht_cap_info &
 635                         cpu_to_le32(IEEE80211_VHT_CAP_TXSTBC)))
 636                 cap &= ~(IEEE80211_VHT_CAP_RXSTBC_1 |
 637                          IEEE80211_VHT_CAP_RXSTBC_3 |
 638                          IEEE80211_VHT_CAP_RXSTBC_4);
 639
 640         for (i = 0; i < 8; i++) {
 641                 int shift = i * 2;
 642                 u16 mask = IEEE80211_VHT_MCS_NOT_SUPPORTED << shift;
 643                 u16 ap_mcs, our_mcs;
 644
 645                 ap_mcs = (le16_to_cpu(ap_vht_cap->supp_mcs.tx_mcs_map) &
 646                                                                 mask) >> shift;
 647                 our_mcs = (le16_to_cpu(vht_cap.vht_mcs.rx_mcs_map) &
 648                                                                 mask) >> shift;
 649
 650                 switch (ap_mcs) {
 651                 default:
 652                         if (our_mcs <= ap_mcs)
 653                                 break;
 654                         /* fall through */
 655                 case IEEE80211_VHT_MCS_NOT_SUPPORTED:
 656                         vht_cap.vht_mcs.rx_mcs_map &= cpu_to_le16(~mask);
 657                         vht_cap.vht_mcs.rx_mcs_map |=
 658                                 cpu_to_le16(ap_mcs << shift);
 659                 }
 660         }
 661
 662         /* reserve and fill IE */
 663         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 664         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 665 }
 666
 667 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 668 {
 669         struct ieee80211_local *local = sdata->local;
 670         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 671         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 672         struct sk_buff *skb;
 673         struct ieee80211_mgmt *mgmt;
 674         u8 *pos, qos_info;
 675         size_t offset = 0, noffset;
 676         int i, count, rates_len, supp_rates_len;
 677         u16 capab;
 678         struct ieee80211_supported_band *sband;
 679         struct ieee80211_chanctx_conf *chanctx_conf;
 680         struct ieee80211_channel *chan;
 681         u32 rates = 0;
 682
 683         lockdep_assert_held(&ifmgd->mtx);
 684
 685         rcu_read_lock();
 686         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 687         if (WARN_ON(!chanctx_conf)) {
 688                 rcu_read_unlock();
 689                 return;
 690         }
 691         chan = chanctx_conf->def.chan;
 692         rcu_read_unlock();
 693         sband = local->hw.wiphy->bands[chan->band];
 694
 695         if (assoc_data->supp_rates_len) {
 696                 /*
 697                  * Get all rates supported by the device and the AP as
 698                  * some APs don't like getting a superset of their rates
 699                  * in the association request (e.g. D-Link DAP 1353 in
 700                  * b-only mode)...
 701                  */
 702                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 703                                                        assoc_data->supp_rates_len,
 704                                                        sband, &rates);
 705         } else {
 706                 /*
 707                  * In case AP not provide any supported rates information
 708                  * before association, we send information element(s) with
 709                  * all rates that we support.
 710                  */
 711                 rates = ~0;
 712                 rates_len = sband->n_bitrates;
 713         }
 714
 715         skb = alloc_skb(local->hw.extra_tx_headroom +
 716                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 717                         2 + assoc_data->ssid_len + /* SSID */
 718                         4 + rates_len + /* (extended) rates */
 719                         4 + /* power capability */
 720                         2 + 2 * sband->n_channels + /* supported channels */
 721                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 722                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 723                         assoc_data->ie_len + /* extra IEs */
 724                         9, /* WMM */
 725                         GFP_KERNEL);
 726         if (!skb)
 727                 return;
 728
 729         skb_reserve(skb, local->hw.extra_tx_headroom);
 730
 731         capab = WLAN_CAPABILITY_ESS;
 732
 733         if (sband->band == IEEE80211_BAND_2GHZ) {
 734                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 735                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 736                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 737                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 738         }
 739
 740         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 741                 capab |= WLAN_CAPABILITY_PRIVACY;
 742
 743         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 744             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 745                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 746
 747         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 748         memset(mgmt, 0, 24);
 749         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 750         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 751         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 752
 753         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 754                 skb_put(skb, 10);
 755                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 756                                                   IEEE80211_STYPE_REASSOC_REQ);
 757                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 758                 mgmt->u.reassoc_req.listen_interval =
 759                                 cpu_to_le16(local->hw.conf.listen_interval);
 760                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 761                        ETH_ALEN);
 762         } else {
 763                 skb_put(skb, 4);
 764                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 765                                                   IEEE80211_STYPE_ASSOC_REQ);
 766                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 767                 mgmt->u.assoc_req.listen_interval =
 768                                 cpu_to_le16(local->hw.conf.listen_interval);
 769         }
 770
 771         /* SSID */
 772         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 773         *pos++ = WLAN_EID_SSID;
 774         *pos++ = assoc_data->ssid_len;
 775         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 776
 777         /* add all rates which were marked to be used above */
 778         supp_rates_len = rates_len;
 779         if (supp_rates_len > 8)
 780                 supp_rates_len = 8;
 781
 782         pos = skb_put(skb, supp_rates_len + 2);
 783         *pos++ = WLAN_EID_SUPP_RATES;
 784         *pos++ = supp_rates_len;
 785
 786         count = 0;
 787         for (i = 0; i < sband->n_bitrates; i++) {
 788                 if (BIT(i) & rates) {
 789                         int rate = sband->bitrates[i].bitrate;
 790                         *pos++ = (u8) (rate / 5);
 791                         if (++count == 8)
 792                                 break;
 793                 }
 794         }
 795
 796         if (rates_len > count) {
 797                 pos = skb_put(skb, rates_len - count + 2);
 798                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 799                 *pos++ = rates_len - count;
 800
 801                 for (i++; i < sband->n_bitrates; i++) {
 802                         if (BIT(i) & rates) {
 803                                 int rate = sband->bitrates[i].bitrate;
 804                                 *pos++ = (u8) (rate / 5);
 805                         }
 806                 }
 807         }
 808
 809         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 810                 /* 1. power capabilities */
 811                 pos = skb_put(skb, 4);
 812                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 813                 *pos++ = 2;
 814                 *pos++ = 0; /* min tx power */
 815                 *pos++ = chan->max_power; /* max tx power */
 816
 817                 /* 2. supported channels */
 818                 /* TODO: get this in reg domain format */
 819                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 820                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 821                 *pos++ = 2 * sband->n_channels;
 822                 for (i = 0; i < sband->n_channels; i++) {
 823                         *pos++ = ieee80211_frequency_to_channel(
 824                                         sband->channels[i].center_freq);
 825                         *pos++ = 1; /* one channel in the subband*/
 826                 }
 827         }
 828
 829         /* if present, add any custom IEs that go before HT */
 830         if (assoc_data->ie_len && assoc_data->ie) {
 831                 static const u8 before_ht[] = {
 832                         WLAN_EID_SSID,
 833                         WLAN_EID_SUPP_RATES,
 834                         WLAN_EID_EXT_SUPP_RATES,
 835                         WLAN_EID_PWR_CAPABILITY,
 836                         WLAN_EID_SUPPORTED_CHANNELS,
 837                         WLAN_EID_RSN,
 838                         WLAN_EID_QOS_CAPA,
 839                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 840                         WLAN_EID_MOBILITY_DOMAIN,
 841                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 842                 };
 843                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 844                                              before_ht, ARRAY_SIZE(before_ht),
 845                                              offset);
 846                 pos = skb_put(skb, noffset - offset);
 847                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 848                 offset = noffset;
 849         }
 850
 851         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 852                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 853                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 854
 855         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 856                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 857                                     sband, chan, sdata->smps_mode);
 858
 859         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 860                 ieee80211_add_vht_ie(sdata, skb, sband,
 861                                      &assoc_data->ap_vht_cap);
 862
 863         /* if present, add any custom non-vendor IEs that go after HT */
 864         if (assoc_data->ie_len && assoc_data->ie) {
 865                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 866                                                     assoc_data->ie_len,
 867                                                     offset);
 868                 pos = skb_put(skb, noffset - offset);
 869                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 870                 offset = noffset;
 871         }
 872
 873         if (assoc_data->wmm) {
 874                 if (assoc_data->uapsd) {
 875                         qos_info = ifmgd->uapsd_queues;
 876                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 877                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 878                 } else {
 879                         qos_info = 0;
 880                 }
 881
 882                 pos = skb_put(skb, 9);
 883                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 884                 *pos++ = 7; /* len */
 885                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 886                 *pos++ = 0x50;
 887                 *pos++ = 0xf2;
 888                 *pos++ = 2; /* WME */
 889                 *pos++ = 0; /* WME info */
 890                 *pos++ = 1; /* WME ver */
 891                 *pos++ = qos_info;
 892         }
 893
 894         /* add any remaining custom (i.e. vendor specific here) IEs */
 895         if (assoc_data->ie_len && assoc_data->ie) {
 896                 noffset = assoc_data->ie_len;
 897                 pos = skb_put(skb, noffset - offset);
 898                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 899         }
 900
 901         drv_mgd_prepare_tx(local, sdata);
 902
 903         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 904         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 905                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 906                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 907         ieee80211_tx_skb(sdata, skb);
 908 }
 909
 910 void ieee80211_send_pspoll(struct ieee80211_local *local,
 911                            struct ieee80211_sub_if_data *sdata)
 912 {
 913         struct ieee80211_pspoll *pspoll;
 914         struct sk_buff *skb;
 915
 916         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 917         if (!skb)
 918                 return;
 919
 920         pspoll = (struct ieee80211_pspoll *) skb->data;
 921         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 922
 923         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 924         ieee80211_tx_skb(sdata, skb);
 925 }
 926
 927 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 928                              struct ieee80211_sub_if_data *sdata,
 929                              int powersave)
 930 {
 931         struct sk_buff *skb;
 932         struct ieee80211_hdr_3addr *nullfunc;
 933         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 934
 935         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 936         if (!skb)
 937                 return;
 938
 939         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 940         if (powersave)
 941                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 942
 943         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 944                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 945         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 946                             IEEE80211_STA_CONNECTION_POLL))
 947                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 948
 949         ieee80211_tx_skb(sdata, skb);
 950 }
 951
 952 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 953                                           struct ieee80211_sub_if_data *sdata)
 954 {
 955         struct sk_buff *skb;
 956         struct ieee80211_hdr *nullfunc;
 957         __le16 fc;
 958
 959         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 960                 return;
 961
 962         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 963         if (!skb)
 964                 return;
 965
 966         skb_reserve(skb, local->hw.extra_tx_headroom);
 967
 968         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 969         memset(nullfunc, 0, 30);
 970         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 971                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 972         nullfunc->frame_control = fc;
 973         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 974         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 975         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 976         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 977
 978         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 979         ieee80211_tx_skb(sdata, skb);
 980 }
 981
 982 /* spectrum management related things */
 983 static void ieee80211_chswitch_work(struct work_struct *work)
 984 {
 985         struct ieee80211_sub_if_data *sdata =
 986                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 987         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 988
 989         if (!ieee80211_sdata_running(sdata))
 990                 return;
 991
 992         mutex_lock(&ifmgd->mtx);
 993         if (!ifmgd->associated)
 994                 goto out;
 995
 996         sdata->local->_oper_channel = sdata->local->csa_channel;
 997         if (!sdata->local->ops->channel_switch) {
 998                 /* call "hw_config" only if doing sw channel switch */
 999                 ieee80211_hw_config(sdata->local,
1000                         IEEE80211_CONF_CHANGE_CHANNEL);
1001         } else {
1002                 /* update the device channel directly */
1003                 sdata->local->hw.conf.channel = sdata->local->_oper_channel;
1004         }
1005
1006         /* XXX: shouldn't really modify cfg80211-owned data! */
1007         ifmgd->associated->channel = sdata->local->_oper_channel;
1008
1009         /* XXX: wait for a beacon first? */
1010         ieee80211_wake_queues_by_reason(&sdata->local->hw,
1011                                         IEEE80211_QUEUE_STOP_REASON_CSA);
1012  out:
1013         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1014         mutex_unlock(&ifmgd->mtx);
1015 }
1016
1017 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1018 {
1019         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1020         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1021
1022         trace_api_chswitch_done(sdata, success);
1023         if (!success) {
1024                 sdata_info(sdata,
1025                            "driver channel switch failed, disconnecting\n");
1026                 ieee80211_queue_work(&sdata->local->hw,
1027                                      &ifmgd->csa_connection_drop_work);
1028         } else {
1029                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1030         }
1031 }
1032 EXPORT_SYMBOL(ieee80211_chswitch_done);
1033
1034 static void ieee80211_chswitch_timer(unsigned long data)
1035 {
1036         struct ieee80211_sub_if_data *sdata =
1037                 (struct ieee80211_sub_if_data *) data;
1038         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1039
1040         if (sdata->local->quiescing) {
1041                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1042                 return;
1043         }
1044
1045         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1046 }
1047
1048 void
1049 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1050                                  const struct ieee80211_channel_sw_ie *sw_elem,
1051                                  struct ieee80211_bss *bss, u64 timestamp)
1052 {
1053         struct cfg80211_bss *cbss =
1054                 container_of((void *)bss, struct cfg80211_bss, priv);
1055         struct ieee80211_channel *new_ch;
1056         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1057         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
1058                                                       cbss->channel->band);
1059         struct ieee80211_chanctx *chanctx;
1060
1061         ASSERT_MGD_MTX(ifmgd);
1062
1063         if (!ifmgd->associated)
1064                 return;
1065
1066         if (sdata->local->scanning)
1067                 return;
1068
1069         /* Disregard subsequent beacons if we are already running a timer
1070            processing a CSA */
1071
1072         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
1073                 return;
1074
1075         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
1076         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
1077                 sdata_info(sdata,
1078                            "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
1079                            ifmgd->associated->bssid, new_freq);
1080                 ieee80211_queue_work(&sdata->local->hw,
1081                                      &ifmgd->csa_connection_drop_work);
1082                 return;
1083         }
1084
1085         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1086
1087         if (sdata->local->use_chanctx) {
1088                 sdata_info(sdata,
1089                            "not handling channel switch with channel contexts\n");
1090                 ieee80211_queue_work(&sdata->local->hw,
1091                                      &ifmgd->csa_connection_drop_work);
1092                 return;
1093         }
1094
1095         mutex_lock(&sdata->local->chanctx_mtx);
1096         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1097                 mutex_unlock(&sdata->local->chanctx_mtx);
1098                 return;
1099         }
1100         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1101                                struct ieee80211_chanctx, conf);
1102         if (chanctx->refcount > 1) {
1103                 sdata_info(sdata,
1104                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
1105                 ieee80211_queue_work(&sdata->local->hw,
1106                                      &ifmgd->csa_connection_drop_work);
1107                 mutex_unlock(&sdata->local->chanctx_mtx);
1108                 return;
1109         }
1110         mutex_unlock(&sdata->local->chanctx_mtx);
1111
1112         sdata->local->csa_channel = new_ch;
1113
1114         if (sw_elem->mode)
1115                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
1116                                 IEEE80211_QUEUE_STOP_REASON_CSA);
1117
1118         if (sdata->local->ops->channel_switch) {
1119                 /* use driver's channel switch callback */
1120                 struct ieee80211_channel_switch ch_switch = {
1121                         .timestamp = timestamp,
1122                         .block_tx = sw_elem->mode,
1123                         .channel = new_ch,
1124                         .count = sw_elem->count,
1125                 };
1126
1127                 drv_channel_switch(sdata->local, &ch_switch);
1128                 return;
1129         }
1130
1131         /* channel switch handled in software */
1132         if (sw_elem->count <= 1)
1133                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1134         else
1135                 mod_timer(&ifmgd->chswitch_timer,
1136                           TU_TO_EXP_TIME(sw_elem->count *
1137                                          cbss->beacon_interval));
1138 }
1139
1140 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1141                                        struct ieee80211_channel *channel,
1142                                        const u8 *country_ie, u8 country_ie_len,
1143                                        const u8 *pwr_constr_elem)
1144 {
1145         struct ieee80211_country_ie_triplet *triplet;
1146         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1147         int i, chan_pwr, chan_increment, new_ap_level;
1148         bool have_chan_pwr = false;
1149
1150         /* Invalid IE */
1151         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1152                 return 0;
1153
1154         triplet = (void *)(country_ie + 3);
1155         country_ie_len -= 3;
1156
1157         switch (channel->band) {
1158         default:
1159                 WARN_ON_ONCE(1);
1160                 /* fall through */
1161         case IEEE80211_BAND_2GHZ:
1162         case IEEE80211_BAND_60GHZ:
1163                 chan_increment = 1;
1164                 break;
1165         case IEEE80211_BAND_5GHZ:
1166                 chan_increment = 4;
1167                 break;
1168         }
1169
1170         /* find channel */
1171         while (country_ie_len >= 3) {
1172                 u8 first_channel = triplet->chans.first_channel;
1173
1174                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1175                         goto next;
1176
1177                 for (i = 0; i < triplet->chans.num_channels; i++) {
1178                         if (first_channel + i * chan_increment == chan) {
1179                                 have_chan_pwr = true;
1180                                 chan_pwr = triplet->chans.max_power;
1181                                 break;
1182                         }
1183                 }
1184                 if (have_chan_pwr)
1185                         break;
1186
1187  next:
1188                 triplet++;
1189                 country_ie_len -= 3;
1190         }
1191
1192         if (!have_chan_pwr)
1193                 return 0;
1194
1195         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1196
1197         if (sdata->ap_power_level == new_ap_level)
1198                 return 0;
1199
1200         sdata_info(sdata,
1201                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1202                    new_ap_level, chan_pwr, *pwr_constr_elem,
1203                    sdata->u.mgd.bssid);
1204         sdata->ap_power_level = new_ap_level;
1205         if (__ieee80211_recalc_txpower(sdata))
1206                 return BSS_CHANGED_TXPOWER;
1207         return 0;
1208 }
1209
1210 /* powersave */
1211 static void ieee80211_enable_ps(struct ieee80211_local *local,
1212                                 struct ieee80211_sub_if_data *sdata)
1213 {
1214         struct ieee80211_conf *conf = &local->hw.conf;
1215
1216         /*
1217          * If we are scanning right now then the parameters will
1218          * take effect when scan finishes.
1219          */
1220         if (local->scanning)
1221                 return;
1222
1223         if (conf->dynamic_ps_timeout > 0 &&
1224             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1225                 mod_timer(&local->dynamic_ps_timer, jiffies +
1226                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1227         } else {
1228                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1229                         ieee80211_send_nullfunc(local, sdata, 1);
1230
1231                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1232                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1233                         return;
1234
1235                 conf->flags |= IEEE80211_CONF_PS;
1236                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1237         }
1238 }
1239
1240 static void ieee80211_change_ps(struct ieee80211_local *local)
1241 {
1242         struct ieee80211_conf *conf = &local->hw.conf;
1243
1244         if (local->ps_sdata) {
1245                 ieee80211_enable_ps(local, local->ps_sdata);
1246         } else if (conf->flags & IEEE80211_CONF_PS) {
1247                 conf->flags &= ~IEEE80211_CONF_PS;
1248                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1249                 del_timer_sync(&local->dynamic_ps_timer);
1250                 cancel_work_sync(&local->dynamic_ps_enable_work);
1251         }
1252 }
1253
1254 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1255 {
1256         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1257         struct sta_info *sta = NULL;
1258         bool authorized = false;
1259
1260         if (!mgd->powersave)
1261                 return false;
1262
1263         if (mgd->broken_ap)
1264                 return false;
1265
1266         if (!mgd->associated)
1267                 return false;
1268
1269         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
1270                           IEEE80211_STA_CONNECTION_POLL))
1271                 return false;
1272
1273         rcu_read_lock();
1274         sta = sta_info_get(sdata, mgd->bssid);
1275         if (sta)
1276                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1277         rcu_read_unlock();
1278
1279         return authorized;
1280 }
1281
1282 /* need to hold RTNL or interface lock */
1283 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1284 {
1285         struct ieee80211_sub_if_data *sdata, *found = NULL;
1286         int count = 0;
1287         int timeout;
1288
1289         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1290                 local->ps_sdata = NULL;
1291                 return;
1292         }
1293
1294         list_for_each_entry(sdata, &local->interfaces, list) {
1295                 if (!ieee80211_sdata_running(sdata))
1296                         continue;
1297                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1298                         /* If an AP vif is found, then disable PS
1299                          * by setting the count to zero thereby setting
1300                          * ps_sdata to NULL.
1301                          */
1302                         count = 0;
1303                         break;
1304                 }
1305                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1306                         continue;
1307                 found = sdata;
1308                 count++;
1309         }
1310
1311         if (count == 1 && ieee80211_powersave_allowed(found)) {
1312                 s32 beaconint_us;
1313
1314                 if (latency < 0)
1315                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1316
1317                 beaconint_us = ieee80211_tu_to_usec(
1318                                         found->vif.bss_conf.beacon_int);
1319
1320                 timeout = local->dynamic_ps_forced_timeout;
1321                 if (timeout < 0) {
1322                         /*
1323                          * Go to full PSM if the user configures a very low
1324                          * latency requirement.
1325                          * The 2000 second value is there for compatibility
1326                          * until the PM_QOS_NETWORK_LATENCY is configured
1327                          * with real values.
1328                          */
1329                         if (latency > (1900 * USEC_PER_MSEC) &&
1330                             latency != (2000 * USEC_PER_SEC))
1331                                 timeout = 0;
1332                         else
1333                                 timeout = 100;
1334                 }
1335                 local->hw.conf.dynamic_ps_timeout = timeout;
1336
1337                 if (beaconint_us > latency) {
1338                         local->ps_sdata = NULL;
1339                 } else {
1340                         int maxslp = 1;
1341                         u8 dtimper = found->u.mgd.dtim_period;
1342
1343                         /* If the TIM IE is invalid, pretend the value is 1 */
1344                         if (!dtimper)
1345                                 dtimper = 1;
1346                         else if (dtimper > 1)
1347                                 maxslp = min_t(int, dtimper,
1348                                                     latency / beaconint_us);
1349
1350                         local->hw.conf.max_sleep_period = maxslp;
1351                         local->hw.conf.ps_dtim_period = dtimper;
1352                         local->ps_sdata = found;
1353                 }
1354         } else {
1355                 local->ps_sdata = NULL;
1356         }
1357
1358         ieee80211_change_ps(local);
1359 }
1360
1361 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1362 {
1363         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1364
1365         if (sdata->vif.bss_conf.ps != ps_allowed) {
1366                 sdata->vif.bss_conf.ps = ps_allowed;
1367                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1368         }
1369 }
1370
1371 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1372 {
1373         struct ieee80211_local *local =
1374                 container_of(work, struct ieee80211_local,
1375                              dynamic_ps_disable_work);
1376
1377         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1378                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1379                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1380         }
1381
1382         ieee80211_wake_queues_by_reason(&local->hw,
1383                                         IEEE80211_QUEUE_STOP_REASON_PS);
1384 }
1385
1386 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1387 {
1388         struct ieee80211_local *local =
1389                 container_of(work, struct ieee80211_local,
1390                              dynamic_ps_enable_work);
1391         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1392         struct ieee80211_if_managed *ifmgd;
1393         unsigned long flags;
1394         int q;
1395
1396         /* can only happen when PS was just disabled anyway */
1397         if (!sdata)
1398                 return;
1399
1400         ifmgd = &sdata->u.mgd;
1401
1402         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1403                 return;
1404
1405         if (local->hw.conf.dynamic_ps_timeout > 0) {
1406                 /* don't enter PS if TX frames are pending */
1407                 if (drv_tx_frames_pending(local)) {
1408                         mod_timer(&local->dynamic_ps_timer, jiffies +
1409                                   msecs_to_jiffies(
1410                                   local->hw.conf.dynamic_ps_timeout));
1411                         return;
1412                 }
1413
1414                 /*
1415                  * transmission can be stopped by others which leads to
1416                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1417                  * is not the actual idle state.
1418                  */
1419                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1420                 for (q = 0; q < local->hw.queues; q++) {
1421                         if (local->queue_stop_reasons[q]) {
1422                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1423                                                        flags);
1424                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1425                                           msecs_to_jiffies(
1426                                           local->hw.conf.dynamic_ps_timeout));
1427                                 return;
1428                         }
1429                 }
1430                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1431         }
1432
1433         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1434             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1435                 netif_tx_stop_all_queues(sdata->dev);
1436
1437                 if (drv_tx_frames_pending(local))
1438                         mod_timer(&local->dynamic_ps_timer, jiffies +
1439                                   msecs_to_jiffies(
1440                                   local->hw.conf.dynamic_ps_timeout));
1441                 else {
1442                         ieee80211_send_nullfunc(local, sdata, 1);
1443                         /* Flush to get the tx status of nullfunc frame */
1444                         drv_flush(local, false);
1445                 }
1446         }
1447
1448         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1449               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1450             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1451                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1452                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1453                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1454         }
1455
1456         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1457                 netif_tx_wake_all_queues(sdata->dev);
1458 }
1459
1460 void ieee80211_dynamic_ps_timer(unsigned long data)
1461 {
1462         struct ieee80211_local *local = (void *) data;
1463
1464         if (local->quiescing || local->suspended)
1465                 return;
1466
1467         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1468 }
1469
1470 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1471 {
1472         struct delayed_work *delayed_work =
1473                 container_of(work, struct delayed_work, work);
1474         struct ieee80211_sub_if_data *sdata =
1475                 container_of(delayed_work, struct ieee80211_sub_if_data,
1476                              dfs_cac_timer_work);
1477
1478         ieee80211_vif_release_channel(sdata);
1479
1480         cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL);
1481 }
1482
1483 /* MLME */
1484 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1485                                      struct ieee80211_sub_if_data *sdata,
1486                                      const u8 *wmm_param, size_t wmm_param_len)
1487 {
1488         struct ieee80211_tx_queue_params params;
1489         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1490         size_t left;
1491         int count;
1492         const u8 *pos;
1493         u8 uapsd_queues = 0;
1494
1495         if (!local->ops->conf_tx)
1496                 return false;
1497
1498         if (local->hw.queues < IEEE80211_NUM_ACS)
1499                 return false;
1500
1501         if (!wmm_param)
1502                 return false;
1503
1504         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1505                 return false;
1506
1507         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1508                 uapsd_queues = ifmgd->uapsd_queues;
1509
1510         count = wmm_param[6] & 0x0f;
1511         if (count == ifmgd->wmm_last_param_set)
1512                 return false;
1513         ifmgd->wmm_last_param_set = count;
1514
1515         pos = wmm_param + 8;
1516         left = wmm_param_len - 8;
1517
1518         memset(&params, 0, sizeof(params));
1519
1520         sdata->wmm_acm = 0;
1521         for (; left >= 4; left -= 4, pos += 4) {
1522                 int aci = (pos[0] >> 5) & 0x03;
1523                 int acm = (pos[0] >> 4) & 0x01;
1524                 bool uapsd = false;
1525                 int queue;
1526
1527                 switch (aci) {
1528                 case 1: /* AC_BK */
1529                         queue = 3;
1530                         if (acm)
1531                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1532                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1533                                 uapsd = true;
1534                         break;
1535                 case 2: /* AC_VI */
1536                         queue = 1;
1537                         if (acm)
1538                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1539                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1540                                 uapsd = true;
1541                         break;
1542                 case 3: /* AC_VO */
1543                         queue = 0;
1544                         if (acm)
1545                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1546                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1547                                 uapsd = true;
1548                         break;
1549                 case 0: /* AC_BE */
1550                 default:
1551                         queue = 2;
1552                         if (acm)
1553                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1554                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1555                                 uapsd = true;
1556                         break;
1557                 }
1558
1559                 params.aifs = pos[0] & 0x0f;
1560                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1561                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1562                 params.txop = get_unaligned_le16(pos + 2);
1563                 params.uapsd = uapsd;
1564
1565                 mlme_dbg(sdata,
1566                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1567                          queue, aci, acm,
1568                          params.aifs, params.cw_min, params.cw_max,
1569                          params.txop, params.uapsd);
1570                 sdata->tx_conf[queue] = params;
1571                 if (drv_conf_tx(local, sdata, queue, &params))
1572                         sdata_err(sdata,
1573                                   "failed to set TX queue parameters for queue %d\n",
1574                                   queue);
1575         }
1576
1577         /* enable WMM or activate new settings */
1578         sdata->vif.bss_conf.qos = true;
1579         return true;
1580 }
1581
1582 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1583 {
1584         lockdep_assert_held(&sdata->local->mtx);
1585
1586         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1587                                 IEEE80211_STA_BEACON_POLL);
1588         ieee80211_run_deferred_scan(sdata->local);
1589 }
1590
1591 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1592 {
1593         mutex_lock(&sdata->local->mtx);
1594         __ieee80211_stop_poll(sdata);
1595         mutex_unlock(&sdata->local->mtx);
1596 }
1597
1598 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1599                                            u16 capab, bool erp_valid, u8 erp)
1600 {
1601         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1602         u32 changed = 0;
1603         bool use_protection;
1604         bool use_short_preamble;
1605         bool use_short_slot;
1606
1607         if (erp_valid) {
1608                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1609                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1610         } else {
1611                 use_protection = false;
1612                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1613         }
1614
1615         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1616         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1617                 use_short_slot = true;
1618
1619         if (use_protection != bss_conf->use_cts_prot) {
1620                 bss_conf->use_cts_prot = use_protection;
1621                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1622         }
1623
1624         if (use_short_preamble != bss_conf->use_short_preamble) {
1625                 bss_conf->use_short_preamble = use_short_preamble;
1626                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1627         }
1628
1629         if (use_short_slot != bss_conf->use_short_slot) {
1630                 bss_conf->use_short_slot = use_short_slot;
1631                 changed |= BSS_CHANGED_ERP_SLOT;
1632         }
1633
1634         return changed;
1635 }
1636
1637 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1638                                      struct cfg80211_bss *cbss,
1639                                      u32 bss_info_changed)
1640 {
1641         struct ieee80211_bss *bss = (void *)cbss->priv;
1642         struct ieee80211_local *local = sdata->local;
1643         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1644
1645         bss_info_changed |= BSS_CHANGED_ASSOC;
1646         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1647                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1648
1649         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1650                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1651
1652         sdata->u.mgd.associated = cbss;
1653         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1654
1655         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1656
1657         if (sdata->vif.p2p) {
1658                 const struct cfg80211_bss_ies *ies;
1659
1660                 rcu_read_lock();
1661                 ies = rcu_dereference(cbss->ies);
1662                 if (ies) {
1663                         u8 noa[2];
1664                         int ret;
1665
1666                         ret = cfg80211_get_p2p_attr(
1667                                         ies->data, ies->len,
1668                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1669                                         noa, sizeof(noa));
1670                         if (ret >= 2) {
1671                                 bss_conf->p2p_oppps = noa[1] & 0x80;
1672                                 bss_conf->p2p_ctwindow = noa[1] & 0x7f;
1673                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1674                                 sdata->u.mgd.p2p_noa_index = noa[0];
1675                         }
1676                 }
1677                 rcu_read_unlock();
1678         }
1679
1680         /* just to be sure */
1681         ieee80211_stop_poll(sdata);
1682
1683         ieee80211_led_assoc(local, 1);
1684
1685         if (sdata->u.mgd.assoc_data->have_beacon) {
1686                 /*
1687                  * If the AP is buggy we may get here with no DTIM period
1688                  * known, so assume it's 1 which is the only safe assumption
1689                  * in that case, although if the TIM IE is broken powersave
1690                  * probably just won't work at all.
1691                  */
1692                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1693                 bss_info_changed |= BSS_CHANGED_DTIM_PERIOD;
1694         } else {
1695                 bss_conf->dtim_period = 0;
1696         }
1697
1698         bss_conf->assoc = 1;
1699
1700         /* Tell the driver to monitor connection quality (if supported) */
1701         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1702             bss_conf->cqm_rssi_thold)
1703                 bss_info_changed |= BSS_CHANGED_CQM;
1704
1705         /* Enable ARP filtering */
1706         if (bss_conf->arp_addr_cnt)
1707                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1708
1709         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1710
1711         mutex_lock(&local->iflist_mtx);
1712         ieee80211_recalc_ps(local, -1);
1713         mutex_unlock(&local->iflist_mtx);
1714
1715         ieee80211_recalc_smps(sdata);
1716         ieee80211_recalc_ps_vif(sdata);
1717
1718         netif_tx_start_all_queues(sdata->dev);
1719         netif_carrier_on(sdata->dev);
1720 }
1721
1722 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1723                                    u16 stype, u16 reason, bool tx,
1724                                    u8 *frame_buf)
1725 {
1726         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1727         struct ieee80211_local *local = sdata->local;
1728         u32 changed = 0;
1729
1730         ASSERT_MGD_MTX(ifmgd);
1731
1732         if (WARN_ON_ONCE(tx && !frame_buf))
1733                 return;
1734
1735         if (WARN_ON(!ifmgd->associated))
1736                 return;
1737
1738         ieee80211_stop_poll(sdata);
1739
1740         ifmgd->associated = NULL;
1741
1742         /*
1743          * we need to commit the associated = NULL change because the
1744          * scan code uses that to determine whether this iface should
1745          * go to/wake up from powersave or not -- and could otherwise
1746          * wake the queues erroneously.
1747          */
1748         smp_mb();
1749
1750         /*
1751          * Thus, we can only afterwards stop the queues -- to account
1752          * for the case where another CPU is finishing a scan at this
1753          * time -- we don't want the scan code to enable queues.
1754          */
1755
1756         netif_tx_stop_all_queues(sdata->dev);
1757         netif_carrier_off(sdata->dev);
1758
1759         /*
1760          * if we want to get out of ps before disassoc (why?) we have
1761          * to do it before sending disassoc, as otherwise the null-packet
1762          * won't be valid.
1763          */
1764         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1765                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1766                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1767         }
1768         local->ps_sdata = NULL;
1769
1770         /* disable per-vif ps */
1771         ieee80211_recalc_ps_vif(sdata);
1772
1773         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1774         if (tx)
1775                 drv_flush(local, false);
1776
1777         /* deauthenticate/disassociate now */
1778         if (tx || frame_buf)
1779                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1780                                                reason, tx, frame_buf);
1781
1782         /* flush out frame */
1783         if (tx)
1784                 drv_flush(local, false);
1785
1786         /* clear bssid only after building the needed mgmt frames */
1787         memset(ifmgd->bssid, 0, ETH_ALEN);
1788
1789         /* remove AP and TDLS peers */
1790         sta_info_flush_defer(sdata);
1791
1792         /* finally reset all BSS / config parameters */
1793         changed |= ieee80211_reset_erp_info(sdata);
1794
1795         ieee80211_led_assoc(local, 0);
1796         changed |= BSS_CHANGED_ASSOC;
1797         sdata->vif.bss_conf.assoc = false;
1798
1799         sdata->vif.bss_conf.p2p_ctwindow = 0;
1800         sdata->vif.bss_conf.p2p_oppps = false;
1801
1802         /* on the next assoc, re-program HT parameters */
1803         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1804         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1805
1806         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1807
1808         del_timer_sync(&local->dynamic_ps_timer);
1809         cancel_work_sync(&local->dynamic_ps_enable_work);
1810
1811         /* Disable ARP filtering */
1812         if (sdata->vif.bss_conf.arp_addr_cnt)
1813                 changed |= BSS_CHANGED_ARP_FILTER;
1814
1815         sdata->vif.bss_conf.qos = false;
1816         changed |= BSS_CHANGED_QOS;
1817
1818         /* The BSSID (not really interesting) and HT changed */
1819         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1820         ieee80211_bss_info_change_notify(sdata, changed);
1821
1822         /* disassociated - set to defaults now */
1823         ieee80211_set_wmm_default(sdata, false);
1824
1825         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1826         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1827         del_timer_sync(&sdata->u.mgd.timer);
1828         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1829
1830         sdata->u.mgd.timers_running = 0;
1831
1832         sdata->vif.bss_conf.dtim_period = 0;
1833
1834         ifmgd->flags = 0;
1835         ieee80211_vif_release_channel(sdata);
1836 }
1837
1838 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1839                              struct ieee80211_hdr *hdr)
1840 {
1841         /*
1842          * We can postpone the mgd.timer whenever receiving unicast frames
1843          * from AP because we know that the connection is working both ways
1844          * at that time. But multicast frames (and hence also beacons) must
1845          * be ignored here, because we need to trigger the timer during
1846          * data idle periods for sending the periodic probe request to the
1847          * AP we're connected to.
1848          */
1849         if (is_multicast_ether_addr(hdr->addr1))
1850                 return;
1851
1852         ieee80211_sta_reset_conn_monitor(sdata);
1853 }
1854
1855 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1856 {
1857         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1858         struct ieee80211_local *local = sdata->local;
1859
1860         mutex_lock(&local->mtx);
1861         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1862                               IEEE80211_STA_CONNECTION_POLL))) {
1863                 mutex_unlock(&local->mtx);
1864                 return;
1865         }
1866
1867         __ieee80211_stop_poll(sdata);
1868
1869         mutex_lock(&local->iflist_mtx);
1870         ieee80211_recalc_ps(local, -1);
1871         mutex_unlock(&local->iflist_mtx);
1872
1873         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1874                 goto out;
1875
1876         /*
1877          * We've received a probe response, but are not sure whether
1878          * we have or will be receiving any beacons or data, so let's
1879          * schedule the timers again, just in case.
1880          */
1881         ieee80211_sta_reset_beacon_monitor(sdata);
1882
1883         mod_timer(&ifmgd->conn_mon_timer,
1884                   round_jiffies_up(jiffies +
1885                                    IEEE80211_CONNECTION_IDLE_TIME));
1886 out:
1887         mutex_unlock(&local->mtx);
1888 }
1889
1890 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1891                              struct ieee80211_hdr *hdr, bool ack)
1892 {
1893         if (!ieee80211_is_data(hdr->frame_control))
1894             return;
1895
1896         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1897             sdata->u.mgd.probe_send_count > 0) {
1898                 if (ack)
1899                         ieee80211_sta_reset_conn_monitor(sdata);
1900                 else
1901                         sdata->u.mgd.nullfunc_failed = true;
1902                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1903                 return;
1904         }
1905
1906         if (ack)
1907                 ieee80211_sta_reset_conn_monitor(sdata);
1908 }
1909
1910 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1911 {
1912         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1913         const u8 *ssid;
1914         u8 *dst = ifmgd->associated->bssid;
1915         u8 unicast_limit = max(1, max_probe_tries - 3);
1916
1917         /*
1918          * Try sending broadcast probe requests for the last three
1919          * probe requests after the first ones failed since some
1920          * buggy APs only support broadcast probe requests.
1921          */
1922         if (ifmgd->probe_send_count >= unicast_limit)
1923                 dst = NULL;
1924
1925         /*
1926          * When the hardware reports an accurate Tx ACK status, it's
1927          * better to send a nullfunc frame instead of a probe request,
1928          * as it will kick us off the AP quickly if we aren't associated
1929          * anymore. The timeout will be reset if the frame is ACKed by
1930          * the AP.
1931          */
1932         ifmgd->probe_send_count++;
1933
1934         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1935                 ifmgd->nullfunc_failed = false;
1936                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1937         } else {
1938                 int ssid_len;
1939
1940                 rcu_read_lock();
1941                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1942                 if (WARN_ON_ONCE(ssid == NULL))
1943                         ssid_len = 0;
1944                 else
1945                         ssid_len = ssid[1];
1946
1947                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1948                                          0, (u32) -1, true, 0,
1949                                          ifmgd->associated->channel, false);
1950                 rcu_read_unlock();
1951         }
1952
1953         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1954         run_again(ifmgd, ifmgd->probe_timeout);
1955         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1956                 drv_flush(sdata->local, false);
1957 }
1958
1959 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1960                                    bool beacon)
1961 {
1962         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1963         bool already = false;
1964
1965         if (!ieee80211_sdata_running(sdata))
1966                 return;
1967
1968         mutex_lock(&ifmgd->mtx);
1969
1970         if (!ifmgd->associated)
1971                 goto out;
1972
1973         mutex_lock(&sdata->local->mtx);
1974
1975         if (sdata->local->tmp_channel || sdata->local->scanning) {
1976                 mutex_unlock(&sdata->local->mtx);
1977                 goto out;
1978         }
1979
1980         if (beacon)
1981                 mlme_dbg_ratelimited(sdata,
1982                                      "detected beacon loss from AP - probing\n");
1983
1984         ieee80211_cqm_rssi_notify(&sdata->vif,
1985                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1986
1987         /*
1988          * The driver/our work has already reported this event or the
1989          * connection monitoring has kicked in and we have already sent
1990          * a probe request. Or maybe the AP died and the driver keeps
1991          * reporting until we disassociate...
1992          *
1993          * In either case we have to ignore the current call to this
1994          * function (except for setting the correct probe reason bit)
1995          * because otherwise we would reset the timer every time and
1996          * never check whether we received a probe response!
1997          */
1998         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1999                             IEEE80211_STA_CONNECTION_POLL))
2000                 already = true;
2001
2002         if (beacon)
2003                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
2004         else
2005                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2006
2007         mutex_unlock(&sdata->local->mtx);
2008
2009         if (already)
2010                 goto out;
2011
2012         mutex_lock(&sdata->local->iflist_mtx);
2013         ieee80211_recalc_ps(sdata->local, -1);
2014         mutex_unlock(&sdata->local->iflist_mtx);
2015
2016         ifmgd->probe_send_count = 0;
2017         ieee80211_mgd_probe_ap_send(sdata);
2018  out:
2019         mutex_unlock(&ifmgd->mtx);
2020 }
2021
2022 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2023                                           struct ieee80211_vif *vif)
2024 {
2025         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2026         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2027         struct cfg80211_bss *cbss;
2028         struct sk_buff *skb;
2029         const u8 *ssid;
2030         int ssid_len;
2031
2032         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2033                 return NULL;
2034
2035         ASSERT_MGD_MTX(ifmgd);
2036
2037         if (ifmgd->associated)
2038                 cbss = ifmgd->associated;
2039         else if (ifmgd->auth_data)
2040                 cbss = ifmgd->auth_data->bss;
2041         else if (ifmgd->assoc_data)
2042                 cbss = ifmgd->assoc_data->bss;
2043         else
2044                 return NULL;
2045
2046         rcu_read_lock();
2047         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2048         if (WARN_ON_ONCE(ssid == NULL))
2049                 ssid_len = 0;
2050         else
2051                 ssid_len = ssid[1];
2052
2053         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2054                                         (u32) -1, cbss->channel,
2055                                         ssid + 2, ssid_len,
2056                                         NULL, 0, true);
2057         rcu_read_unlock();
2058
2059         return skb;
2060 }
2061 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2062
2063 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2064 {
2065         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2066         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2067
2068         mutex_lock(&ifmgd->mtx);
2069         if (!ifmgd->associated) {
2070                 mutex_unlock(&ifmgd->mtx);
2071                 return;
2072         }
2073
2074         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2075                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2076                                true, frame_buf);
2077         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2078         ieee80211_wake_queues_by_reason(&sdata->local->hw,
2079                                         IEEE80211_QUEUE_STOP_REASON_CSA);
2080         mutex_unlock(&ifmgd->mtx);
2081
2082         /*
2083          * must be outside lock due to cfg80211,
2084          * but that's not a problem.
2085          */
2086         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2087 }
2088
2089 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2090 {
2091         struct ieee80211_sub_if_data *sdata =
2092                 container_of(work, struct ieee80211_sub_if_data,
2093                              u.mgd.beacon_connection_loss_work);
2094         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2095         struct sta_info *sta;
2096
2097         if (ifmgd->associated) {
2098                 rcu_read_lock();
2099                 sta = sta_info_get(sdata, ifmgd->bssid);
2100                 if (sta)
2101                         sta->beacon_loss_count++;
2102                 rcu_read_unlock();
2103         }
2104
2105         if (ifmgd->connection_loss) {
2106                 sdata_info(sdata, "Connection to AP %pM lost\n",
2107                            ifmgd->bssid);
2108                 __ieee80211_disconnect(sdata);
2109         } else {
2110                 ieee80211_mgd_probe_ap(sdata, true);
2111         }
2112 }
2113
2114 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2115 {
2116         struct ieee80211_sub_if_data *sdata =
2117                 container_of(work, struct ieee80211_sub_if_data,
2118                              u.mgd.csa_connection_drop_work);
2119
2120         __ieee80211_disconnect(sdata);
2121 }
2122
2123 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2124 {
2125         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2126         struct ieee80211_hw *hw = &sdata->local->hw;
2127
2128         trace_api_beacon_loss(sdata);
2129
2130         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
2131         sdata->u.mgd.connection_loss = false;
2132         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2133 }
2134 EXPORT_SYMBOL(ieee80211_beacon_loss);
2135
2136 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2137 {
2138         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2139         struct ieee80211_hw *hw = &sdata->local->hw;
2140
2141         trace_api_connection_loss(sdata);
2142
2143         sdata->u.mgd.connection_loss = true;
2144         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2145 }
2146 EXPORT_SYMBOL(ieee80211_connection_loss);
2147
2148
2149 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2150                                         bool assoc)
2151 {
2152         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2153
2154         lockdep_assert_held(&sdata->u.mgd.mtx);
2155
2156         if (!assoc) {
2157                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2158
2159                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2160                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2161                 sdata->u.mgd.flags = 0;
2162                 ieee80211_vif_release_channel(sdata);
2163         }
2164
2165         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2166         kfree(auth_data);
2167         sdata->u.mgd.auth_data = NULL;
2168 }
2169
2170 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2171                                      struct ieee80211_mgmt *mgmt, size_t len)
2172 {
2173         struct ieee80211_local *local = sdata->local;
2174         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2175         u8 *pos;
2176         struct ieee802_11_elems elems;
2177         u32 tx_flags = 0;
2178
2179         pos = mgmt->u.auth.variable;
2180         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2181         if (!elems.challenge)
2182                 return;
2183         auth_data->expected_transaction = 4;
2184         drv_mgd_prepare_tx(sdata->local, sdata);
2185         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2186                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2187                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2188         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2189                             elems.challenge - 2, elems.challenge_len + 2,
2190                             auth_data->bss->bssid, auth_data->bss->bssid,
2191                             auth_data->key, auth_data->key_len,
2192                             auth_data->key_idx, tx_flags);
2193 }
2194
2195 static enum rx_mgmt_action __must_check
2196 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2197                        struct ieee80211_mgmt *mgmt, size_t len)
2198 {
2199         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2200         u8 bssid[ETH_ALEN];
2201         u16 auth_alg, auth_transaction, status_code;
2202         struct sta_info *sta;
2203
2204         lockdep_assert_held(&ifmgd->mtx);
2205
2206         if (len < 24 + 6)
2207                 return RX_MGMT_NONE;
2208
2209         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2210                 return RX_MGMT_NONE;
2211
2212         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2213
2214         if (!ether_addr_equal(bssid, mgmt->bssid))
2215                 return RX_MGMT_NONE;
2216
2217         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2218         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2219         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2220
2221         if (auth_alg != ifmgd->auth_data->algorithm ||
2222             auth_transaction != ifmgd->auth_data->expected_transaction) {
2223                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2224                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2225                            auth_transaction,
2226                            ifmgd->auth_data->expected_transaction);
2227                 return RX_MGMT_NONE;
2228         }
2229
2230         if (status_code != WLAN_STATUS_SUCCESS) {
2231                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2232                            mgmt->sa, status_code);
2233                 ieee80211_destroy_auth_data(sdata, false);
2234                 return RX_MGMT_CFG80211_RX_AUTH;
2235         }
2236
2237         switch (ifmgd->auth_data->algorithm) {
2238         case WLAN_AUTH_OPEN:
2239         case WLAN_AUTH_LEAP:
2240         case WLAN_AUTH_FT:
2241         case WLAN_AUTH_SAE:
2242                 break;
2243         case WLAN_AUTH_SHARED_KEY:
2244                 if (ifmgd->auth_data->expected_transaction != 4) {
2245                         ieee80211_auth_challenge(sdata, mgmt, len);
2246                         /* need another frame */
2247                         return RX_MGMT_NONE;
2248                 }
2249                 break;
2250         default:
2251                 WARN_ONCE(1, "invalid auth alg %d",
2252                           ifmgd->auth_data->algorithm);
2253                 return RX_MGMT_NONE;
2254         }
2255
2256         sdata_info(sdata, "authenticated\n");
2257         ifmgd->auth_data->done = true;
2258         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2259         ifmgd->auth_data->timeout_started = true;
2260         run_again(ifmgd, ifmgd->auth_data->timeout);
2261
2262         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2263             ifmgd->auth_data->expected_transaction != 2) {
2264                 /*
2265                  * Report auth frame to user space for processing since another
2266                  * round of Authentication frames is still needed.
2267                  */
2268                 return RX_MGMT_CFG80211_RX_AUTH;
2269         }
2270
2271         /* move station state to auth */
2272         mutex_lock(&sdata->local->sta_mtx);
2273         sta = sta_info_get(sdata, bssid);
2274         if (!sta) {
2275                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2276                 goto out_err;
2277         }
2278         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2279                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2280                 goto out_err;
2281         }
2282         mutex_unlock(&sdata->local->sta_mtx);
2283
2284         return RX_MGMT_CFG80211_RX_AUTH;
2285  out_err:
2286         mutex_unlock(&sdata->local->sta_mtx);
2287         /* ignore frame -- wait for timeout */
2288         return RX_MGMT_NONE;
2289 }
2290
2291
2292 static enum rx_mgmt_action __must_check
2293 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2294                          struct ieee80211_mgmt *mgmt, size_t len)
2295 {
2296         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2297         const u8 *bssid = NULL;
2298         u16 reason_code;
2299
2300         lockdep_assert_held(&ifmgd->mtx);
2301
2302         if (len < 24 + 2)
2303                 return RX_MGMT_NONE;
2304
2305         if (!ifmgd->associated ||
2306             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2307                 return RX_MGMT_NONE;
2308
2309         bssid = ifmgd->associated->bssid;
2310
2311         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2312
2313         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2314                    bssid, reason_code);
2315
2316         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2317
2318         return RX_MGMT_CFG80211_DEAUTH;
2319 }
2320
2321
2322 static enum rx_mgmt_action __must_check
2323 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2324                            struct ieee80211_mgmt *mgmt, size_t len)
2325 {
2326         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2327         u16 reason_code;
2328
2329         lockdep_assert_held(&ifmgd->mtx);
2330
2331         if (len < 24 + 2)
2332                 return RX_MGMT_NONE;
2333
2334         if (!ifmgd->associated ||
2335             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2336                 return RX_MGMT_NONE;
2337
2338         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2339
2340         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2341                    mgmt->sa, reason_code);
2342
2343         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2344
2345         return RX_MGMT_CFG80211_DISASSOC;
2346 }
2347
2348 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2349                                 u8 *supp_rates, unsigned int supp_rates_len,
2350                                 u32 *rates, u32 *basic_rates,
2351                                 bool *have_higher_than_11mbit,
2352                                 int *min_rate, int *min_rate_index)
2353 {
2354         int i, j;
2355
2356         for (i = 0; i < supp_rates_len; i++) {
2357                 int rate = (supp_rates[i] & 0x7f) * 5;
2358                 bool is_basic = !!(supp_rates[i] & 0x80);
2359
2360                 if (rate > 110)
2361                         *have_higher_than_11mbit = true;
2362
2363                 /*
2364                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2365                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2366                  *
2367                  * Note: Even through the membership selector and the basic
2368                  *       rate flag share the same bit, they are not exactly
2369                  *       the same.
2370                  */
2371                 if (!!(supp_rates[i] & 0x80) &&
2372                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2373                         continue;
2374
2375                 for (j = 0; j < sband->n_bitrates; j++) {
2376                         if (sband->bitrates[j].bitrate == rate) {
2377                                 *rates |= BIT(j);
2378                                 if (is_basic)
2379                                         *basic_rates |= BIT(j);
2380                                 if (rate < *min_rate) {
2381                                         *min_rate = rate;
2382                                         *min_rate_index = j;
2383                                 }
2384                                 break;
2385                         }
2386                 }
2387         }
2388 }
2389
2390 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2391                                          bool assoc)
2392 {
2393         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2394
2395         lockdep_assert_held(&sdata->u.mgd.mtx);
2396
2397         if (!assoc) {
2398                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2399
2400                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2401                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2402                 sdata->u.mgd.flags = 0;
2403                 ieee80211_vif_release_channel(sdata);
2404         }
2405
2406         kfree(assoc_data);
2407         sdata->u.mgd.assoc_data = NULL;
2408 }
2409
2410 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2411                                     struct cfg80211_bss *cbss,
2412                                     struct ieee80211_mgmt *mgmt, size_t len)
2413 {
2414         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2415         struct ieee80211_local *local = sdata->local;
2416         struct ieee80211_supported_band *sband;
2417         struct sta_info *sta;
2418         u8 *pos;
2419         u16 capab_info, aid;
2420         struct ieee802_11_elems elems;
2421         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2422         u32 changed = 0;
2423         int err;
2424
2425         /* AssocResp and ReassocResp have identical structure */
2426
2427         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2428         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2429
2430         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2431                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2432                            aid);
2433         aid &= ~(BIT(15) | BIT(14));
2434
2435         ifmgd->broken_ap = false;
2436
2437         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2438                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2439                            aid);
2440                 aid = 0;
2441                 ifmgd->broken_ap = true;
2442         }
2443
2444         pos = mgmt->u.assoc_resp.variable;
2445         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2446
2447         if (!elems.supp_rates) {
2448                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2449                 return false;
2450         }
2451
2452         ifmgd->aid = aid;
2453
2454         /*
2455          * We previously checked these in the beacon/probe response, so
2456          * they should be present here. This is just a safety net.
2457          */
2458         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2459             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2460                 sdata_info(sdata,
2461                            "HT AP is missing WMM params or HT capability/operation in AssocResp\n");
2462                 return false;
2463         }
2464
2465         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2466             (!elems.vht_cap_elem || !elems.vht_operation)) {
2467                 sdata_info(sdata,
2468                            "VHT AP is missing VHT capability/operation in AssocResp\n");
2469                 return false;
2470         }
2471
2472         mutex_lock(&sdata->local->sta_mtx);
2473         /*
2474          * station info was already allocated and inserted before
2475          * the association and should be available to us
2476          */
2477         sta = sta_info_get(sdata, cbss->bssid);
2478         if (WARN_ON(!sta)) {
2479                 mutex_unlock(&sdata->local->sta_mtx);
2480                 return false;
2481         }
2482
2483         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2484
2485         /* Set up internal HT/VHT capabilities */
2486         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2487                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2488                                                   elems.ht_cap_elem, sta);
2489
2490         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2491                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2492                                                     elems.vht_cap_elem, sta);
2493
2494         /*
2495          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2496          * in their association response, so ignore that data for our own
2497          * configuration. If it changed since the last beacon, we'll get the
2498          * next beacon and update then.
2499          */
2500
2501         /*
2502          * If an operating mode notification IE is present, override the
2503          * NSS calculation (that would be done in rate_control_rate_init())
2504          * and use the # of streams from that element.
2505          */
2506         if (elems.opmode_notif &&
2507             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2508                 u8 nss;
2509
2510                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2511                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2512                 nss += 1;
2513                 sta->sta.rx_nss = nss;
2514         }
2515
2516         rate_control_rate_init(sta);
2517
2518         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2519                 set_sta_flag(sta, WLAN_STA_MFP);
2520
2521         if (elems.wmm_param)
2522                 set_sta_flag(sta, WLAN_STA_WME);
2523
2524         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2525         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2526                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2527         if (err) {
2528                 sdata_info(sdata,
2529                            "failed to move station %pM to desired state\n",
2530                            sta->sta.addr);
2531                 WARN_ON(__sta_info_destroy(sta));
2532                 mutex_unlock(&sdata->local->sta_mtx);
2533                 return false;
2534         }
2535
2536         mutex_unlock(&sdata->local->sta_mtx);
2537
2538         /*
2539          * Always handle WMM once after association regardless
2540          * of the first value the AP uses. Setting -1 here has
2541          * that effect because the AP values is an unsigned
2542          * 4-bit value.
2543          */
2544         ifmgd->wmm_last_param_set = -1;
2545
2546         if (elems.wmm_param)
2547                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2548                                          elems.wmm_param_len);
2549         else
2550                 ieee80211_set_wmm_default(sdata, false);
2551         changed |= BSS_CHANGED_QOS;
2552
2553         /* set AID and assoc capability,
2554          * ieee80211_set_associated() will tell the driver */
2555         bss_conf->aid = aid;
2556         bss_conf->assoc_capability = capab_info;
2557         ieee80211_set_associated(sdata, cbss, changed);
2558
2559         /*
2560          * If we're using 4-addr mode, let the AP know that we're
2561          * doing so, so that it can create the STA VLAN on its side
2562          */
2563         if (ifmgd->use_4addr)
2564                 ieee80211_send_4addr_nullfunc(local, sdata);
2565
2566         /*
2567          * Start timer to probe the connection to the AP now.
2568          * Also start the timer that will detect beacon loss.
2569          */
2570         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2571         ieee80211_sta_reset_beacon_monitor(sdata);
2572
2573         return true;
2574 }
2575
2576 static enum rx_mgmt_action __must_check
2577 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2578                              struct ieee80211_mgmt *mgmt, size_t len,
2579                              struct cfg80211_bss **bss)
2580 {
2581         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2582         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2583         u16 capab_info, status_code, aid;
2584         struct ieee802_11_elems elems;
2585         u8 *pos;
2586         bool reassoc;
2587
2588         lockdep_assert_held(&ifmgd->mtx);
2589
2590         if (!assoc_data)
2591                 return RX_MGMT_NONE;
2592         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2593                 return RX_MGMT_NONE;
2594
2595         /*
2596          * AssocResp and ReassocResp have identical structure, so process both
2597          * of them in this function.
2598          */
2599
2600         if (len < 24 + 6)
2601                 return RX_MGMT_NONE;
2602
2603         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2604         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2605         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2606         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2607
2608         sdata_info(sdata,
2609                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2610                    reassoc ? "Rea" : "A", mgmt->sa,
2611                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2612
2613         pos = mgmt->u.assoc_resp.variable;
2614         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2615
2616         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2617             elems.timeout_int && elems.timeout_int_len == 5 &&
2618             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2619                 u32 tu, ms;
2620                 tu = get_unaligned_le32(elems.timeout_int + 1);
2621                 ms = tu * 1024 / 1000;
2622                 sdata_info(sdata,
2623                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2624                            mgmt->sa, tu, ms);
2625                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2626                 assoc_data->timeout_started = true;
2627                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2628                         run_again(ifmgd, assoc_data->timeout);
2629                 return RX_MGMT_NONE;
2630         }
2631
2632         *bss = assoc_data->bss;
2633
2634         if (status_code != WLAN_STATUS_SUCCESS) {
2635                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2636                            mgmt->sa, status_code);
2637                 ieee80211_destroy_assoc_data(sdata, false);
2638         } else {
2639                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2640                         /* oops -- internal error -- send timeout for now */
2641                         ieee80211_destroy_assoc_data(sdata, false);
2642                         cfg80211_put_bss(sdata->local->hw.wiphy, *bss);
2643                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2644                 }
2645                 sdata_info(sdata, "associated\n");
2646
2647                 /*
2648                  * destroy assoc_data afterwards, as otherwise an idle
2649                  * recalc after assoc_data is NULL but before associated
2650                  * is set can cause the interface to go idle
2651                  */
2652                 ieee80211_destroy_assoc_data(sdata, true);
2653         }
2654
2655         return RX_MGMT_CFG80211_RX_ASSOC;
2656 }
2657
2658 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2659                                   struct ieee80211_mgmt *mgmt, size_t len,
2660                                   struct ieee80211_rx_status *rx_status,
2661                                   struct ieee802_11_elems *elems)
2662 {
2663         struct ieee80211_local *local = sdata->local;
2664         int freq;
2665         struct ieee80211_bss *bss;
2666         struct ieee80211_channel *channel;
2667         bool need_ps = false;
2668
2669         if ((sdata->u.mgd.associated &&
2670              ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) ||
2671             (sdata->u.mgd.assoc_data &&
2672              ether_addr_equal(mgmt->bssid,
2673                               sdata->u.mgd.assoc_data->bss->bssid))) {
2674                 /* not previously set so we may need to recalc */
2675                 need_ps = sdata->u.mgd.associated && !sdata->u.mgd.dtim_period;
2676
2677                 if (elems->tim && !elems->parse_error) {
2678                         const struct ieee80211_tim_ie *tim_ie = elems->tim;
2679                         sdata->u.mgd.dtim_period = tim_ie->dtim_period;
2680                 }
2681         }
2682
2683         if (elems->ds_params && elems->ds_params_len == 1)
2684                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2685                                                       rx_status->band);
2686         else
2687                 freq = rx_status->freq;
2688
2689         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2690
2691         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2692                 return;
2693
2694         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2695                                         channel);
2696         if (bss)
2697                 ieee80211_rx_bss_put(local, bss);
2698
2699         if (!sdata->u.mgd.associated)
2700                 return;
2701
2702         if (need_ps) {
2703                 mutex_lock(&local->iflist_mtx);
2704                 ieee80211_recalc_ps(local, -1);
2705                 mutex_unlock(&local->iflist_mtx);
2706         }
2707
2708         if (elems->ch_switch_ie &&
2709             memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2710                 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2711                                                  bss, rx_status->mactime);
2712 }
2713
2714
2715 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2716                                          struct sk_buff *skb)
2717 {
2718         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2719         struct ieee80211_if_managed *ifmgd;
2720         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2721         size_t baselen, len = skb->len;
2722         struct ieee802_11_elems elems;
2723
2724         ifmgd = &sdata->u.mgd;
2725
2726         ASSERT_MGD_MTX(ifmgd);
2727
2728         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2729                 return; /* ignore ProbeResp to foreign address */
2730
2731         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2732         if (baselen > len)
2733                 return;
2734
2735         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2736                                 &elems);
2737
2738         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2739
2740         if (ifmgd->associated &&
2741             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2742                 ieee80211_reset_ap_probe(sdata);
2743
2744         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2745             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2746                 /* got probe response, continue with auth */
2747                 sdata_info(sdata, "direct probe responded\n");
2748                 ifmgd->auth_data->tries = 0;
2749                 ifmgd->auth_data->timeout = jiffies;
2750                 ifmgd->auth_data->timeout_started = true;
2751                 run_again(ifmgd, ifmgd->auth_data->timeout);
2752         }
2753 }
2754
2755 /*
2756  * This is the canonical list of information elements we care about,
2757  * the filter code also gives us all changes to the Microsoft OUI
2758  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2759  *
2760  * We implement beacon filtering in software since that means we can
2761  * avoid processing the frame here and in cfg80211, and userspace
2762  * will not be able to tell whether the hardware supports it or not.
2763  *
2764  * XXX: This list needs to be dynamic -- userspace needs to be able to
2765  *      add items it requires. It also needs to be able to tell us to
2766  *      look out for other vendor IEs.
2767  */
2768 static const u64 care_about_ies =
2769         (1ULL << WLAN_EID_COUNTRY) |
2770         (1ULL << WLAN_EID_ERP_INFO) |
2771         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2772         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2773         (1ULL << WLAN_EID_HT_CAPABILITY) |
2774         (1ULL << WLAN_EID_HT_OPERATION);
2775
2776 static enum rx_mgmt_action
2777 ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2778                          struct ieee80211_mgmt *mgmt, size_t len,
2779                          u8 *deauth_buf, struct ieee80211_rx_status *rx_status)
2780 {
2781         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2782         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2783         size_t baselen;
2784         struct ieee802_11_elems elems;
2785         struct ieee80211_local *local = sdata->local;
2786         struct ieee80211_chanctx_conf *chanctx_conf;
2787         struct ieee80211_channel *chan;
2788         struct sta_info *sta;
2789         u32 changed = 0;
2790         bool erp_valid;
2791         u8 erp_value = 0;
2792         u32 ncrc;
2793         u8 *bssid;
2794
2795         lockdep_assert_held(&ifmgd->mtx);
2796
2797         /* Process beacon from the current BSS */
2798         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2799         if (baselen > len)
2800                 return RX_MGMT_NONE;
2801
2802         rcu_read_lock();
2803         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2804         if (!chanctx_conf) {
2805                 rcu_read_unlock();
2806                 return RX_MGMT_NONE;
2807         }
2808
2809         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2810                 rcu_read_unlock();
2811                 return RX_MGMT_NONE;
2812         }
2813         chan = chanctx_conf->def.chan;
2814         rcu_read_unlock();
2815
2816         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2817             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2818                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2819                                        len - baselen, &elems);
2820
2821                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2822                 ifmgd->assoc_data->have_beacon = true;
2823                 ifmgd->assoc_data->need_beacon = false;
2824                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2825                         sdata->vif.bss_conf.sync_tsf =
2826                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2827                         sdata->vif.bss_conf.sync_device_ts =
2828                                 rx_status->device_timestamp;
2829                         if (elems.tim)
2830                                 sdata->vif.bss_conf.sync_dtim_count =
2831                                         elems.tim->dtim_count;
2832                         else
2833                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2834                 }
2835                 /* continue assoc process */
2836                 ifmgd->assoc_data->timeout = jiffies;
2837                 ifmgd->assoc_data->timeout_started = true;
2838                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2839                 return RX_MGMT_NONE;
2840         }
2841
2842         if (!ifmgd->associated ||
2843             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2844                 return RX_MGMT_NONE;
2845         bssid = ifmgd->associated->bssid;
2846
2847         /* Track average RSSI from the Beacon frames of the current AP */
2848         ifmgd->last_beacon_signal = rx_status->signal;
2849         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2850                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2851                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2852                 ifmgd->last_cqm_event_signal = 0;
2853                 ifmgd->count_beacon_signal = 1;
2854                 ifmgd->last_ave_beacon_signal = 0;
2855         } else {
2856                 ifmgd->ave_beacon_signal =
2857                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2858                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2859                          ifmgd->ave_beacon_signal) / 16;
2860                 ifmgd->count_beacon_signal++;
2861         }
2862
2863         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2864             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2865                 int sig = ifmgd->ave_beacon_signal;
2866                 int last_sig = ifmgd->last_ave_beacon_signal;
2867
2868                 /*
2869                  * if signal crosses either of the boundaries, invoke callback
2870                  * with appropriate parameters
2871                  */
2872                 if (sig > ifmgd->rssi_max_thold &&
2873                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2874                         ifmgd->last_ave_beacon_signal = sig;
2875                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2876                 } else if (sig < ifmgd->rssi_min_thold &&
2877                            (last_sig >= ifmgd->rssi_max_thold ||
2878                            last_sig == 0)) {
2879                         ifmgd->last_ave_beacon_signal = sig;
2880                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2881                 }
2882         }
2883
2884         if (bss_conf->cqm_rssi_thold &&
2885             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2886             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2887                 int sig = ifmgd->ave_beacon_signal / 16;
2888                 int last_event = ifmgd->last_cqm_event_signal;
2889                 int thold = bss_conf->cqm_rssi_thold;
2890                 int hyst = bss_conf->cqm_rssi_hyst;
2891                 if (sig < thold &&
2892                     (last_event == 0 || sig < last_event - hyst)) {
2893                         ifmgd->last_cqm_event_signal = sig;
2894                         ieee80211_cqm_rssi_notify(
2895                                 &sdata->vif,
2896                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2897                                 GFP_KERNEL);
2898                 } else if (sig > thold &&
2899                            (last_event == 0 || sig > last_event + hyst)) {
2900                         ifmgd->last_cqm_event_signal = sig;
2901                         ieee80211_cqm_rssi_notify(
2902                                 &sdata->vif,
2903                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2904                                 GFP_KERNEL);
2905                 }
2906         }
2907
2908         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2909                 mlme_dbg_ratelimited(sdata,
2910                                      "cancelling AP probe due to a received beacon\n");
2911                 mutex_lock(&local->mtx);
2912                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2913                 ieee80211_run_deferred_scan(local);
2914                 mutex_unlock(&local->mtx);
2915
2916                 mutex_lock(&local->iflist_mtx);
2917                 ieee80211_recalc_ps(local, -1);
2918                 mutex_unlock(&local->iflist_mtx);
2919         }
2920
2921         /*
2922          * Push the beacon loss detection into the future since
2923          * we are processing a beacon from the AP just now.
2924          */
2925         ieee80211_sta_reset_beacon_monitor(sdata);
2926
2927         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2928         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2929                                           len - baselen, &elems,
2930                                           care_about_ies, ncrc);
2931
2932         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2933                 bool directed_tim = ieee80211_check_tim(elems.tim,
2934                                                         elems.tim_len,
2935                                                         ifmgd->aid);
2936                 if (directed_tim) {
2937                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2938                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2939                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2940                                         ieee80211_hw_config(local,
2941                                                             IEEE80211_CONF_CHANGE_PS);
2942                                 }
2943                                 ieee80211_send_nullfunc(local, sdata, 0);
2944                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2945                                 local->pspolling = true;
2946
2947                                 /*
2948                                  * Here is assumed that the driver will be
2949                                  * able to send ps-poll frame and receive a
2950                                  * response even though power save mode is
2951                                  * enabled, but some drivers might require
2952                                  * to disable power save here. This needs
2953                                  * to be investigated.
2954                                  */
2955                                 ieee80211_send_pspoll(local, sdata);
2956                         }
2957                 }
2958         }
2959
2960         if (sdata->vif.p2p) {
2961                 u8 noa[2];
2962                 int ret;
2963
2964                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
2965                                             len - baselen,
2966                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2967                                             noa, sizeof(noa));
2968                 if (ret >= 2 && sdata->u.mgd.p2p_noa_index != noa[0]) {
2969                         bss_conf->p2p_oppps = noa[1] & 0x80;
2970                         bss_conf->p2p_ctwindow = noa[1] & 0x7f;
2971                         changed |= BSS_CHANGED_P2P_PS;
2972                         sdata->u.mgd.p2p_noa_index = noa[0];
2973                         /*
2974                          * make sure we update all information, the CRC
2975                          * mechanism doesn't look at P2P attributes.
2976                          */
2977                         ifmgd->beacon_crc_valid = false;
2978                 }
2979         }
2980
2981         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2982                 return RX_MGMT_NONE;
2983         ifmgd->beacon_crc = ncrc;
2984         ifmgd->beacon_crc_valid = true;
2985
2986         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2987
2988         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2989                                      elems.wmm_param_len))
2990                 changed |= BSS_CHANGED_QOS;
2991
2992         /*
2993          * If we haven't had a beacon before, tell the driver about the
2994          * DTIM period (and beacon timing if desired) now.
2995          */
2996         if (!bss_conf->dtim_period) {
2997                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
2998                 if (elems.tim)
2999                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3000                 else
3001                         bss_conf->dtim_period = 1;
3002
3003                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3004                         sdata->vif.bss_conf.sync_tsf =
3005                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3006                         sdata->vif.bss_conf.sync_device_ts =
3007                                 rx_status->device_timestamp;
3008                         if (elems.tim)
3009                                 sdata->vif.bss_conf.sync_dtim_count =
3010                                         elems.tim->dtim_count;
3011                         else
3012                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3013                 }
3014
3015                 changed |= BSS_CHANGED_DTIM_PERIOD;
3016         }
3017
3018         if (elems.erp_info && elems.erp_info_len >= 1) {
3019                 erp_valid = true;
3020                 erp_value = elems.erp_info[0];
3021         } else {
3022                 erp_valid = false;
3023         }
3024         changed |= ieee80211_handle_bss_capability(sdata,
3025                         le16_to_cpu(mgmt->u.beacon.capab_info),
3026                         erp_valid, erp_value);
3027
3028         mutex_lock(&local->sta_mtx);
3029         sta = sta_info_get(sdata, bssid);
3030
3031         if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3032                                 elems.vht_operation, bssid, &changed)) {
3033                 mutex_unlock(&local->sta_mtx);
3034                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3035                                        WLAN_REASON_DEAUTH_LEAVING,
3036                                        true, deauth_buf);
3037                 return RX_MGMT_CFG80211_TX_DEAUTH;
3038         }
3039
3040         if (sta && elems.opmode_notif)
3041                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3042                                             rx_status->band, true);
3043         mutex_unlock(&local->sta_mtx);
3044
3045         if (elems.country_elem && elems.pwr_constr_elem &&
3046             mgmt->u.probe_resp.capab_info &
3047                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3048                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3049                                                        elems.country_elem,
3050                                                        elems.country_elem_len,
3051                                                        elems.pwr_constr_elem);
3052
3053         ieee80211_bss_info_change_notify(sdata, changed);
3054
3055         return RX_MGMT_NONE;
3056 }
3057
3058 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3059                                   struct sk_buff *skb)
3060 {
3061         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3062         struct ieee80211_rx_status *rx_status;
3063         struct ieee80211_mgmt *mgmt;
3064         struct cfg80211_bss *bss = NULL;
3065         enum rx_mgmt_action rma = RX_MGMT_NONE;
3066         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3067         u16 fc;
3068
3069         rx_status = (struct ieee80211_rx_status *) skb->cb;
3070         mgmt = (struct ieee80211_mgmt *) skb->data;
3071         fc = le16_to_cpu(mgmt->frame_control);
3072
3073         mutex_lock(&ifmgd->mtx);
3074
3075         switch (fc & IEEE80211_FCTL_STYPE) {
3076         case IEEE80211_STYPE_BEACON:
3077                 rma = ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
3078                                                deauth_buf, rx_status);
3079                 break;
3080         case IEEE80211_STYPE_PROBE_RESP:
3081                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3082                 break;
3083         case IEEE80211_STYPE_AUTH:
3084                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3085                 break;
3086         case IEEE80211_STYPE_DEAUTH:
3087                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3088                 break;
3089         case IEEE80211_STYPE_DISASSOC:
3090                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3091                 break;
3092         case IEEE80211_STYPE_ASSOC_RESP:
3093         case IEEE80211_STYPE_REASSOC_RESP:
3094                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
3095                 break;
3096         case IEEE80211_STYPE_ACTION:
3097                 switch (mgmt->u.action.category) {
3098                 case WLAN_CATEGORY_SPECTRUM_MGMT:
3099                         ieee80211_sta_process_chanswitch(sdata,
3100                                         &mgmt->u.action.u.chan_switch.sw_elem,
3101                                         (void *)ifmgd->associated->priv,
3102                                         rx_status->mactime);
3103                         break;
3104                 }
3105         }
3106         mutex_unlock(&ifmgd->mtx);
3107
3108         switch (rma) {
3109         case RX_MGMT_NONE:
3110                 /* no action */
3111                 break;
3112         case RX_MGMT_CFG80211_DEAUTH:
3113                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
3114                 break;
3115         case RX_MGMT_CFG80211_DISASSOC:
3116                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
3117                 break;
3118         case RX_MGMT_CFG80211_RX_AUTH:
3119                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
3120                 break;
3121         case RX_MGMT_CFG80211_RX_ASSOC:
3122                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
3123                 break;
3124         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
3125                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
3126                 break;
3127         case RX_MGMT_CFG80211_TX_DEAUTH:
3128                 cfg80211_send_deauth(sdata->dev, deauth_buf,
3129                                      sizeof(deauth_buf));
3130                 break;
3131         default:
3132                 WARN(1, "unexpected: %d", rma);
3133         }
3134 }
3135
3136 static void ieee80211_sta_timer(unsigned long data)
3137 {
3138         struct ieee80211_sub_if_data *sdata =
3139                 (struct ieee80211_sub_if_data *) data;
3140         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3141         struct ieee80211_local *local = sdata->local;
3142
3143         if (local->quiescing) {
3144                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
3145                 return;
3146         }
3147
3148         ieee80211_queue_work(&local->hw, &sdata->work);
3149 }
3150
3151 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3152                                           u8 *bssid, u8 reason, bool tx)
3153 {
3154         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3155         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3156
3157         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3158                                tx, frame_buf);
3159         mutex_unlock(&ifmgd->mtx);
3160
3161         /*
3162          * must be outside lock due to cfg80211,
3163          * but that's not a problem.
3164          */
3165         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
3166
3167         mutex_lock(&ifmgd->mtx);
3168 }
3169
3170 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3171 {
3172         struct ieee80211_local *local = sdata->local;
3173         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3174         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3175         u32 tx_flags = 0;
3176
3177         lockdep_assert_held(&ifmgd->mtx);
3178
3179         if (WARN_ON_ONCE(!auth_data))
3180                 return -EINVAL;
3181
3182         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3183                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3184                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3185
3186         auth_data->tries++;
3187
3188         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3189                 sdata_info(sdata, "authentication with %pM timed out\n",
3190                            auth_data->bss->bssid);
3191
3192                 /*
3193                  * Most likely AP is not in the range so remove the
3194                  * bss struct for that AP.
3195                  */
3196                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3197
3198                 return -ETIMEDOUT;
3199         }
3200
3201         drv_mgd_prepare_tx(local, sdata);
3202
3203         if (auth_data->bss->proberesp_ies) {
3204                 u16 trans = 1;
3205                 u16 status = 0;
3206
3207                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3208                            auth_data->bss->bssid, auth_data->tries,
3209                            IEEE80211_AUTH_MAX_TRIES);
3210
3211                 auth_data->expected_transaction = 2;
3212
3213                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3214                         trans = auth_data->sae_trans;
3215                         status = auth_data->sae_status;
3216                         auth_data->expected_transaction = trans;
3217                 }
3218
3219                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3220                                     auth_data->data, auth_data->data_len,
3221                                     auth_data->bss->bssid,
3222                                     auth_data->bss->bssid, NULL, 0, 0,
3223                                     tx_flags);
3224         } else {
3225                 const u8 *ssidie;
3226
3227                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3228                            auth_data->bss->bssid, auth_data->tries,
3229                            IEEE80211_AUTH_MAX_TRIES);
3230
3231                 rcu_read_lock();
3232                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3233                 if (!ssidie) {
3234                         rcu_read_unlock();
3235                         return -EINVAL;
3236                 }
3237                 /*
3238                  * Direct probe is sent to broadcast address as some APs
3239                  * will not answer to direct packet in unassociated state.
3240                  */
3241                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3242                                          NULL, 0, (u32) -1, true, tx_flags,
3243                                          auth_data->bss->channel, false);
3244                 rcu_read_unlock();
3245         }
3246
3247         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3248                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3249                 ifmgd->auth_data->timeout_started = true;
3250                 run_again(ifmgd, auth_data->timeout);
3251         } else {
3252                 auth_data->timeout_started = false;
3253         }
3254
3255         return 0;
3256 }
3257
3258 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3259 {
3260         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3261         struct ieee80211_local *local = sdata->local;
3262
3263         lockdep_assert_held(&sdata->u.mgd.mtx);
3264
3265         assoc_data->tries++;
3266         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3267                 sdata_info(sdata, "association with %pM timed out\n",
3268                            assoc_data->bss->bssid);
3269
3270                 /*
3271                  * Most likely AP is not in the range so remove the
3272                  * bss struct for that AP.
3273                  */
3274                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3275
3276                 return -ETIMEDOUT;
3277         }
3278
3279         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3280                    assoc_data->bss->bssid, assoc_data->tries,
3281                    IEEE80211_ASSOC_MAX_TRIES);
3282         ieee80211_send_assoc(sdata);
3283
3284         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3285                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3286                 assoc_data->timeout_started = true;
3287                 run_again(&sdata->u.mgd, assoc_data->timeout);
3288         } else {
3289                 assoc_data->timeout_started = false;
3290         }
3291
3292         return 0;
3293 }
3294
3295 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3296                                   __le16 fc, bool acked)
3297 {
3298         struct ieee80211_local *local = sdata->local;
3299
3300         sdata->u.mgd.status_fc = fc;
3301         sdata->u.mgd.status_acked = acked;
3302         sdata->u.mgd.status_received = true;
3303
3304         ieee80211_queue_work(&local->hw, &sdata->work);
3305 }
3306
3307 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3308 {
3309         struct ieee80211_local *local = sdata->local;
3310         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3311
3312         mutex_lock(&ifmgd->mtx);
3313
3314         if (ifmgd->status_received) {
3315                 __le16 fc = ifmgd->status_fc;
3316                 bool status_acked = ifmgd->status_acked;
3317
3318                 ifmgd->status_received = false;
3319                 if (ifmgd->auth_data &&
3320                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3321                         if (status_acked) {
3322                                 ifmgd->auth_data->timeout =
3323                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3324                                 run_again(ifmgd, ifmgd->auth_data->timeout);
3325                         } else {
3326                                 ifmgd->auth_data->timeout = jiffies - 1;
3327                         }
3328                         ifmgd->auth_data->timeout_started = true;
3329                 } else if (ifmgd->assoc_data &&
3330                            (ieee80211_is_assoc_req(fc) ||
3331                             ieee80211_is_reassoc_req(fc))) {
3332                         if (status_acked) {
3333                                 ifmgd->assoc_data->timeout =
3334                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3335                                 run_again(ifmgd, ifmgd->assoc_data->timeout);
3336                         } else {
3337                                 ifmgd->assoc_data->timeout = jiffies - 1;
3338                         }
3339                         ifmgd->assoc_data->timeout_started = true;
3340                 }
3341         }
3342
3343         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3344             time_after(jiffies, ifmgd->auth_data->timeout)) {
3345                 if (ifmgd->auth_data->done) {
3346                         /*
3347                          * ok ... we waited for assoc but userspace didn't,
3348                          * so let's just kill the auth data
3349                          */
3350                         ieee80211_destroy_auth_data(sdata, false);
3351                 } else if (ieee80211_probe_auth(sdata)) {
3352                         u8 bssid[ETH_ALEN];
3353
3354                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3355
3356                         ieee80211_destroy_auth_data(sdata, false);
3357
3358                         mutex_unlock(&ifmgd->mtx);
3359                         cfg80211_send_auth_timeout(sdata->dev, bssid);
3360                         mutex_lock(&ifmgd->mtx);
3361                 }
3362         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3363                 run_again(ifmgd, ifmgd->auth_data->timeout);
3364
3365         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3366             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3367                 if ((ifmgd->assoc_data->need_beacon &&
3368                      !ifmgd->assoc_data->have_beacon) ||
3369                     ieee80211_do_assoc(sdata)) {
3370                         u8 bssid[ETH_ALEN];
3371
3372                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
3373
3374                         ieee80211_destroy_assoc_data(sdata, false);
3375
3376                         mutex_unlock(&ifmgd->mtx);
3377                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
3378                         mutex_lock(&ifmgd->mtx);
3379                 }
3380         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3381                 run_again(ifmgd, ifmgd->assoc_data->timeout);
3382
3383         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
3384                             IEEE80211_STA_CONNECTION_POLL) &&
3385             ifmgd->associated) {
3386                 u8 bssid[ETH_ALEN];
3387                 int max_tries;
3388
3389                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3390
3391                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3392                         max_tries = max_nullfunc_tries;
3393                 else
3394                         max_tries = max_probe_tries;
3395
3396                 /* ACK received for nullfunc probing frame */
3397                 if (!ifmgd->probe_send_count)
3398                         ieee80211_reset_ap_probe(sdata);
3399                 else if (ifmgd->nullfunc_failed) {
3400                         if (ifmgd->probe_send_count < max_tries) {
3401                                 mlme_dbg(sdata,
3402                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3403                                          bssid, ifmgd->probe_send_count,
3404                                          max_tries);
3405                                 ieee80211_mgd_probe_ap_send(sdata);
3406                         } else {
3407                                 mlme_dbg(sdata,
3408                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3409                                          bssid);
3410                                 ieee80211_sta_connection_lost(sdata, bssid,
3411                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3412                                         false);
3413                         }
3414                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3415                         run_again(ifmgd, ifmgd->probe_timeout);
3416                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3417                         mlme_dbg(sdata,
3418                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3419                                  bssid, probe_wait_ms);
3420                         ieee80211_sta_connection_lost(sdata, bssid,
3421                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3422                 } else if (ifmgd->probe_send_count < max_tries) {
3423                         mlme_dbg(sdata,
3424                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3425                                  bssid, probe_wait_ms,
3426                                  ifmgd->probe_send_count, max_tries);
3427                         ieee80211_mgd_probe_ap_send(sdata);
3428                 } else {
3429                         /*
3430                          * We actually lost the connection ... or did we?
3431                          * Let's make sure!
3432                          */
3433                         wiphy_debug(local->hw.wiphy,
3434                                     "%s: No probe response from AP %pM"
3435                                     " after %dms, disconnecting.\n",
3436                                     sdata->name,
3437                                     bssid, probe_wait_ms);
3438
3439                         ieee80211_sta_connection_lost(sdata, bssid,
3440                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3441                 }
3442         }
3443
3444         mutex_unlock(&ifmgd->mtx);
3445 }
3446
3447 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3448 {
3449         struct ieee80211_sub_if_data *sdata =
3450                 (struct ieee80211_sub_if_data *) data;
3451         struct ieee80211_local *local = sdata->local;
3452
3453         if (local->quiescing)
3454                 return;
3455
3456         sdata->u.mgd.connection_loss = false;
3457         ieee80211_queue_work(&sdata->local->hw,
3458                              &sdata->u.mgd.beacon_connection_loss_work);
3459 }
3460
3461 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3462 {
3463         struct ieee80211_sub_if_data *sdata =
3464                 (struct ieee80211_sub_if_data *) data;
3465         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3466         struct ieee80211_local *local = sdata->local;
3467
3468         if (local->quiescing)
3469                 return;
3470
3471         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3472 }
3473
3474 static void ieee80211_sta_monitor_work(struct work_struct *work)
3475 {
3476         struct ieee80211_sub_if_data *sdata =
3477                 container_of(work, struct ieee80211_sub_if_data,
3478                              u.mgd.monitor_work);
3479
3480         ieee80211_mgd_probe_ap(sdata, false);
3481 }
3482
3483 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3484 {
3485         u32 flags;
3486
3487         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3488                 __ieee80211_stop_poll(sdata);
3489
3490                 /* let's probe the connection once */
3491                 flags = sdata->local->hw.flags;
3492                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3493                         ieee80211_queue_work(&sdata->local->hw,
3494                                              &sdata->u.mgd.monitor_work);
3495                 /* and do all the other regular work too */
3496                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3497         }
3498 }
3499
3500 #ifdef CONFIG_PM
3501 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
3502 {
3503         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3504
3505         /*
3506          * we need to use atomic bitops for the running bits
3507          * only because both timers might fire at the same
3508          * time -- the code here is properly synchronised.
3509          */
3510
3511         cancel_work_sync(&ifmgd->request_smps_work);
3512
3513         cancel_work_sync(&ifmgd->monitor_work);
3514         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
3515         cancel_work_sync(&ifmgd->csa_connection_drop_work);
3516         if (del_timer_sync(&ifmgd->timer))
3517                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
3518
3519         cancel_work_sync(&ifmgd->chswitch_work);
3520         if (del_timer_sync(&ifmgd->chswitch_timer))
3521                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
3522
3523         /* these will just be re-established on connection */
3524         del_timer_sync(&ifmgd->conn_mon_timer);
3525         del_timer_sync(&ifmgd->bcn_mon_timer);
3526 }
3527
3528 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3529 {
3530         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3531
3532         mutex_lock(&ifmgd->mtx);
3533         if (!ifmgd->associated) {
3534                 mutex_unlock(&ifmgd->mtx);
3535                 return;
3536         }
3537
3538         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3539                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3540                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3541                 ieee80211_sta_connection_lost(sdata,
3542                                               ifmgd->associated->bssid,
3543                                               WLAN_REASON_UNSPECIFIED,
3544                                               true);
3545                 mutex_unlock(&ifmgd->mtx);
3546                 return;
3547         }
3548         mutex_unlock(&ifmgd->mtx);
3549
3550         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
3551                 add_timer(&ifmgd->timer);
3552         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
3553                 add_timer(&ifmgd->chswitch_timer);
3554         ieee80211_sta_reset_beacon_monitor(sdata);
3555
3556         mutex_lock(&sdata->local->mtx);
3557         ieee80211_restart_sta_timer(sdata);
3558         mutex_unlock(&sdata->local->mtx);
3559 }
3560 #endif
3561
3562 /* interface setup */
3563 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3564 {
3565         struct ieee80211_if_managed *ifmgd;
3566
3567         ifmgd = &sdata->u.mgd;
3568         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3569         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3570         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3571                   ieee80211_beacon_connection_loss_work);
3572         INIT_WORK(&ifmgd->csa_connection_drop_work,
3573                   ieee80211_csa_connection_drop_work);
3574         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3575         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3576                     (unsigned long) sdata);
3577         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3578                     (unsigned long) sdata);
3579         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3580                     (unsigned long) sdata);
3581         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3582                     (unsigned long) sdata);
3583
3584         ifmgd->flags = 0;
3585         ifmgd->powersave = sdata->wdev.ps;
3586         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3587         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3588
3589         mutex_init(&ifmgd->mtx);
3590
3591         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3592                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3593         else
3594                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3595 }
3596
3597 /* scan finished notification */
3598 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3599 {
3600         struct ieee80211_sub_if_data *sdata;
3601
3602         /* Restart STA timers */
3603         rcu_read_lock();
3604         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3605                 ieee80211_restart_sta_timer(sdata);
3606         rcu_read_unlock();
3607 }
3608
3609 int ieee80211_max_network_latency(struct notifier_block *nb,
3610                                   unsigned long data, void *dummy)
3611 {
3612         s32 latency_usec = (s32) data;
3613         struct ieee80211_local *local =
3614                 container_of(nb, struct ieee80211_local,
3615                              network_latency_notifier);
3616
3617         mutex_lock(&local->iflist_mtx);
3618         ieee80211_recalc_ps(local, latency_usec);
3619         mutex_unlock(&local->iflist_mtx);
3620
3621         return 0;
3622 }
3623
3624 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3625                                      struct cfg80211_bss *cbss)
3626 {
3627         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3628         const u8 *ht_cap_ie, *vht_cap_ie;
3629         const struct ieee80211_ht_cap *ht_cap;
3630         const struct ieee80211_vht_cap *vht_cap;
3631         u8 chains = 1;
3632
3633         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3634                 return chains;
3635
3636         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3637         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3638                 ht_cap = (void *)(ht_cap_ie + 2);
3639                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3640                 /*
3641                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3642                  *       "Tx Unequal Modulation Supported" fields.
3643                  */
3644         }
3645
3646         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3647                 return chains;
3648
3649         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3650         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3651                 u8 nss;
3652                 u16 tx_mcs_map;
3653
3654                 vht_cap = (void *)(vht_cap_ie + 2);
3655                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3656                 for (nss = 8; nss > 0; nss--) {
3657                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3658                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3659                                 break;
3660                 }
3661                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3662                 chains = max(chains, nss);
3663         }
3664
3665         return chains;
3666 }
3667
3668 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3669                                   struct cfg80211_bss *cbss)
3670 {
3671         struct ieee80211_local *local = sdata->local;
3672         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3673         const struct ieee80211_ht_operation *ht_oper = NULL;
3674         const struct ieee80211_vht_operation *vht_oper = NULL;
3675         struct ieee80211_supported_band *sband;
3676         struct cfg80211_chan_def chandef;
3677         int ret;
3678
3679         sband = local->hw.wiphy->bands[cbss->channel->band];
3680
3681         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3682                           IEEE80211_STA_DISABLE_80P80MHZ |
3683                           IEEE80211_STA_DISABLE_160MHZ);
3684
3685         rcu_read_lock();
3686
3687         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3688             sband->ht_cap.ht_supported) {
3689                 const u8 *ht_oper_ie, *ht_cap;
3690
3691                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3692                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3693                         ht_oper = (void *)(ht_oper_ie + 2);
3694
3695                 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3696                 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3697                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3698                         ht_oper = NULL;
3699                 }
3700         }
3701
3702         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3703             sband->vht_cap.vht_supported) {
3704                 const u8 *vht_oper_ie, *vht_cap;
3705
3706                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3707                                                    WLAN_EID_VHT_OPERATION);
3708                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3709                         vht_oper = (void *)(vht_oper_ie + 2);
3710                 if (vht_oper && !ht_oper) {
3711                         vht_oper = NULL;
3712                         sdata_info(sdata,
3713                                    "AP advertised VHT without HT, disabling both\n");
3714                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3715                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3716                 }
3717
3718                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3719                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3720                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3721                         vht_oper = NULL;
3722                 }
3723         }
3724
3725         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3726                                                      cbss->channel,
3727                                                      ht_oper, vht_oper,
3728                                                      &chandef, true);
3729
3730         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3731                                       local->rx_chains);
3732
3733         rcu_read_unlock();
3734
3735         /* will change later if needed */
3736         sdata->smps_mode = IEEE80211_SMPS_OFF;
3737
3738         /*
3739          * If this fails (possibly due to channel context sharing
3740          * on incompatible channels, e.g. 80+80 and 160 sharing the
3741          * same control channel) try to use a smaller bandwidth.
3742          */
3743         ret = ieee80211_vif_use_channel(sdata, &chandef,
3744                                         IEEE80211_CHANCTX_SHARED);
3745         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3746                 ifmgd->flags |= chandef_downgrade(&chandef);
3747                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3748                                                 IEEE80211_CHANCTX_SHARED);
3749         }
3750         return ret;
3751 }
3752
3753 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3754                                      struct cfg80211_bss *cbss, bool assoc)
3755 {
3756         struct ieee80211_local *local = sdata->local;
3757         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3758         struct ieee80211_bss *bss = (void *)cbss->priv;
3759         struct sta_info *new_sta = NULL;
3760         bool have_sta = false;
3761         int err;
3762
3763         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3764                 return -EINVAL;
3765
3766         if (assoc) {
3767                 rcu_read_lock();
3768                 have_sta = sta_info_get(sdata, cbss->bssid);
3769                 rcu_read_unlock();
3770         }
3771
3772         if (!have_sta) {
3773                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3774                 if (!new_sta)
3775                         return -ENOMEM;
3776         }
3777
3778         if (new_sta) {
3779                 u32 rates = 0, basic_rates = 0;
3780                 bool have_higher_than_11mbit;
3781                 int min_rate = INT_MAX, min_rate_index = -1;
3782                 struct ieee80211_supported_band *sband;
3783                 const struct cfg80211_bss_ies *ies;
3784
3785                 sband = local->hw.wiphy->bands[cbss->channel->band];
3786
3787                 err = ieee80211_prep_channel(sdata, cbss);
3788                 if (err) {
3789                         sta_info_free(local, new_sta);
3790                         return err;
3791                 }
3792
3793                 ieee80211_get_rates(sband, bss->supp_rates,
3794                                     bss->supp_rates_len,
3795                                     &rates, &basic_rates,
3796                                     &have_higher_than_11mbit,
3797                                     &min_rate, &min_rate_index);
3798
3799                 /*
3800                  * This used to be a workaround for basic rates missing
3801                  * in the association response frame. Now that we no
3802                  * longer use the basic rates from there, it probably
3803                  * doesn't happen any more, but keep the workaround so
3804                  * in case some *other* APs are buggy in different ways
3805                  * we can connect -- with a warning.
3806                  */
3807                 if (!basic_rates && min_rate_index >= 0) {
3808                         sdata_info(sdata,
3809                                    "No basic rates, using min rate instead\n");
3810                         basic_rates = BIT(min_rate_index);
3811                 }
3812
3813                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3814                 sdata->vif.bss_conf.basic_rates = basic_rates;
3815
3816                 /* cf. IEEE 802.11 9.2.12 */
3817                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3818                     have_higher_than_11mbit)
3819                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3820                 else
3821                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3822
3823                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3824
3825                 /* set timing information */
3826                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3827                 rcu_read_lock();
3828                 ies = rcu_dereference(cbss->beacon_ies);
3829                 if (ies) {
3830                         const u8 *tim_ie;
3831
3832                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3833                         sdata->vif.bss_conf.sync_device_ts =
3834                                 bss->device_ts_beacon;
3835                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3836                                                   ies->data, ies->len);
3837                         if (tim_ie && tim_ie[1] >= 2)
3838                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
3839                         else
3840                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3841                 } else if (!(local->hw.flags &
3842                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
3843                         ies = rcu_dereference(cbss->proberesp_ies);
3844                         /* must be non-NULL since beacon IEs were NULL */
3845                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3846                         sdata->vif.bss_conf.sync_device_ts =
3847                                 bss->device_ts_presp;
3848                         sdata->vif.bss_conf.sync_dtim_count = 0;
3849                 } else {
3850                         sdata->vif.bss_conf.sync_tsf = 0;
3851                         sdata->vif.bss_conf.sync_device_ts = 0;
3852                         sdata->vif.bss_conf.sync_dtim_count = 0;
3853                 }
3854                 rcu_read_unlock();
3855
3856                 /* tell driver about BSSID, basic rates and timing */
3857                 ieee80211_bss_info_change_notify(sdata,
3858                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3859                         BSS_CHANGED_BEACON_INT);
3860
3861                 if (assoc)
3862                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3863
3864                 err = sta_info_insert(new_sta);
3865                 new_sta = NULL;
3866                 if (err) {
3867                         sdata_info(sdata,
3868                                    "failed to insert STA entry for the AP (error %d)\n",
3869                                    err);
3870                         return err;
3871                 }
3872         } else
3873                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3874
3875         return 0;
3876 }
3877
3878 /* config hooks */
3879 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3880                        struct cfg80211_auth_request *req)
3881 {
3882         struct ieee80211_local *local = sdata->local;
3883         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3884         struct ieee80211_mgd_auth_data *auth_data;
3885         u16 auth_alg;
3886         int err;
3887
3888         /* prepare auth data structure */
3889
3890         switch (req->auth_type) {
3891         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3892                 auth_alg = WLAN_AUTH_OPEN;
3893                 break;
3894         case NL80211_AUTHTYPE_SHARED_KEY:
3895                 if (IS_ERR(local->wep_tx_tfm))
3896                         return -EOPNOTSUPP;
3897                 auth_alg = WLAN_AUTH_SHARED_KEY;
3898                 break;
3899         case NL80211_AUTHTYPE_FT:
3900                 auth_alg = WLAN_AUTH_FT;
3901                 break;
3902         case NL80211_AUTHTYPE_NETWORK_EAP:
3903                 auth_alg = WLAN_AUTH_LEAP;
3904                 break;
3905         case NL80211_AUTHTYPE_SAE:
3906                 auth_alg = WLAN_AUTH_SAE;
3907                 break;
3908         default:
3909                 return -EOPNOTSUPP;
3910         }
3911
3912         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3913                             req->ie_len, GFP_KERNEL);
3914         if (!auth_data)
3915                 return -ENOMEM;
3916
3917         auth_data->bss = req->bss;
3918
3919         if (req->sae_data_len >= 4) {
3920                 __le16 *pos = (__le16 *) req->sae_data;
3921                 auth_data->sae_trans = le16_to_cpu(pos[0]);
3922                 auth_data->sae_status = le16_to_cpu(pos[1]);
3923                 memcpy(auth_data->data, req->sae_data + 4,
3924                        req->sae_data_len - 4);
3925                 auth_data->data_len += req->sae_data_len - 4;
3926         }
3927
3928         if (req->ie && req->ie_len) {
3929                 memcpy(&auth_data->data[auth_data->data_len],
3930                        req->ie, req->ie_len);
3931                 auth_data->data_len += req->ie_len;
3932         }
3933
3934         if (req->key && req->key_len) {
3935                 auth_data->key_len = req->key_len;
3936                 auth_data->key_idx = req->key_idx;
3937                 memcpy(auth_data->key, req->key, req->key_len);
3938         }
3939
3940         auth_data->algorithm = auth_alg;
3941
3942         /* try to authenticate/probe */
3943
3944         mutex_lock(&ifmgd->mtx);
3945
3946         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3947             ifmgd->assoc_data) {
3948                 err = -EBUSY;
3949                 goto err_free;
3950         }
3951
3952         if (ifmgd->auth_data)
3953                 ieee80211_destroy_auth_data(sdata, false);
3954
3955         /* prep auth_data so we don't go into idle on disassoc */
3956         ifmgd->auth_data = auth_data;
3957
3958         if (ifmgd->associated)
3959                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3960
3961         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3962
3963         err = ieee80211_prep_connection(sdata, req->bss, false);
3964         if (err)
3965                 goto err_clear;
3966
3967         err = ieee80211_probe_auth(sdata);
3968         if (err) {
3969                 sta_info_destroy_addr(sdata, req->bss->bssid);
3970                 goto err_clear;
3971         }
3972
3973         /* hold our own reference */
3974         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
3975         err = 0;
3976         goto out_unlock;
3977
3978  err_clear:
3979         memset(ifmgd->bssid, 0, ETH_ALEN);
3980         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3981         ifmgd->auth_data = NULL;
3982  err_free:
3983         kfree(auth_data);
3984  out_unlock:
3985         mutex_unlock(&ifmgd->mtx);
3986
3987         return err;
3988 }
3989
3990 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3991                         struct cfg80211_assoc_request *req)
3992 {
3993         struct ieee80211_local *local = sdata->local;
3994         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3995         struct ieee80211_bss *bss = (void *)req->bss->priv;
3996         struct ieee80211_mgd_assoc_data *assoc_data;
3997         const struct cfg80211_bss_ies *beacon_ies;
3998         struct ieee80211_supported_band *sband;
3999         const u8 *ssidie, *ht_ie, *vht_ie;
4000         int i, err;
4001
4002         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4003         if (!assoc_data)
4004                 return -ENOMEM;
4005
4006         rcu_read_lock();
4007         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4008         if (!ssidie) {
4009                 rcu_read_unlock();
4010                 kfree(assoc_data);
4011                 return -EINVAL;
4012         }
4013         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4014         assoc_data->ssid_len = ssidie[1];
4015         rcu_read_unlock();
4016
4017         mutex_lock(&ifmgd->mtx);
4018
4019         if (ifmgd->associated)
4020                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
4021
4022         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4023                 err = -EBUSY;
4024                 goto err_free;
4025         }
4026
4027         if (ifmgd->assoc_data) {
4028                 err = -EBUSY;
4029                 goto err_free;
4030         }
4031
4032         if (ifmgd->auth_data) {
4033                 bool match;
4034
4035                 /* keep sta info, bssid if matching */
4036                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4037                 ieee80211_destroy_auth_data(sdata, match);
4038         }
4039
4040         /* prepare assoc data */
4041
4042         ifmgd->beacon_crc_valid = false;
4043
4044         /*
4045          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4046          * We still associate in non-HT mode (11a/b/g) if any one of these
4047          * ciphers is configured as pairwise.
4048          * We can set this to true for non-11n hardware, that'll be checked
4049          * separately along with the peer capabilities.
4050          */
4051         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4052                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4053                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4054                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4055                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4056                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4057                         netdev_info(sdata->dev,
4058                                     "disabling HT/VHT due to WEP/TKIP use\n");
4059                 }
4060         }
4061
4062         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4063                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4064                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4065         }
4066
4067         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4068         sband = local->hw.wiphy->bands[req->bss->channel->band];
4069         if (!sband->ht_cap.ht_supported ||
4070             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4071                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4072                 if (!bss->wmm_used)
4073                         netdev_info(sdata->dev,
4074                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4075         }
4076
4077         /* disable VHT if we don't support it or the AP doesn't use WMM */
4078         if (!sband->vht_cap.vht_supported ||
4079             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4080                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4081                 if (!bss->wmm_used)
4082                         netdev_info(sdata->dev,
4083                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4084         }
4085
4086         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4087         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4088                sizeof(ifmgd->ht_capa_mask));
4089
4090         if (req->ie && req->ie_len) {
4091                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4092                 assoc_data->ie_len = req->ie_len;
4093         }
4094
4095         assoc_data->bss = req->bss;
4096
4097         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4098                 if (ifmgd->powersave)
4099                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4100                 else
4101                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4102         } else
4103                 sdata->smps_mode = ifmgd->req_smps;
4104
4105         assoc_data->capability = req->bss->capability;
4106         assoc_data->wmm = bss->wmm_used &&
4107                           (local->hw.queues >= IEEE80211_NUM_ACS);
4108         assoc_data->supp_rates = bss->supp_rates;
4109         assoc_data->supp_rates_len = bss->supp_rates_len;
4110
4111         rcu_read_lock();
4112         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4113         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4114                 assoc_data->ap_ht_param =
4115                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4116         else
4117                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4118         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4119         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4120                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4121                        sizeof(struct ieee80211_vht_cap));
4122         else
4123                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4124         rcu_read_unlock();
4125
4126         if (bss->wmm_used && bss->uapsd_supported &&
4127             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4128                 assoc_data->uapsd = true;
4129                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4130         } else {
4131                 assoc_data->uapsd = false;
4132                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4133         }
4134
4135         if (req->prev_bssid)
4136                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4137
4138         if (req->use_mfp) {
4139                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4140                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4141         } else {
4142                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4143                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4144         }
4145
4146         if (req->crypto.control_port)
4147                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4148         else
4149                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4150
4151         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4152         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4153
4154         /* kick off associate process */
4155
4156         ifmgd->assoc_data = assoc_data;
4157         ifmgd->dtim_period = 0;
4158
4159         err = ieee80211_prep_connection(sdata, req->bss, true);
4160         if (err)
4161                 goto err_clear;
4162
4163         rcu_read_lock();
4164         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4165
4166         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4167             !beacon_ies) {
4168                 /*
4169                  * Wait up to one beacon interval ...
4170                  * should this be more if we miss one?
4171                  */
4172                 sdata_info(sdata, "waiting for beacon from %pM\n",
4173                            ifmgd->bssid);
4174                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4175                 assoc_data->timeout_started = true;
4176                 assoc_data->need_beacon = true;
4177         } else if (beacon_ies) {
4178                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4179                                                     beacon_ies->data,
4180                                                     beacon_ies->len);
4181                 u8 dtim_count = 0;
4182
4183                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4184                         const struct ieee80211_tim_ie *tim;
4185                         tim = (void *)(tim_ie + 2);
4186                         ifmgd->dtim_period = tim->dtim_period;
4187                         dtim_count = tim->dtim_count;
4188                 }
4189                 assoc_data->have_beacon = true;
4190                 assoc_data->timeout = jiffies;
4191                 assoc_data->timeout_started = true;
4192
4193                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4194                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4195                         sdata->vif.bss_conf.sync_device_ts =
4196                                 bss->device_ts_beacon;
4197                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4198                 }
4199         } else {
4200                 assoc_data->timeout = jiffies;
4201                 assoc_data->timeout_started = true;
4202         }
4203         rcu_read_unlock();
4204
4205         run_again(ifmgd, assoc_data->timeout);
4206
4207         if (bss->corrupt_data) {
4208                 char *corrupt_type = "data";
4209                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4210                         if (bss->corrupt_data &
4211                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4212                                 corrupt_type = "beacon and probe response";
4213                         else
4214                                 corrupt_type = "beacon";
4215                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4216                         corrupt_type = "probe response";
4217                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4218                            corrupt_type);
4219         }
4220
4221         err = 0;
4222         goto out;
4223  err_clear:
4224         memset(ifmgd->bssid, 0, ETH_ALEN);
4225         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4226         ifmgd->assoc_data = NULL;
4227  err_free:
4228         kfree(assoc_data);
4229  out:
4230         mutex_unlock(&ifmgd->mtx);
4231
4232         return err;
4233 }
4234
4235 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4236                          struct cfg80211_deauth_request *req)
4237 {
4238         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4239         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4240         bool tx = !req->local_state_change;
4241         bool sent_frame = false;
4242
4243         mutex_lock(&ifmgd->mtx);
4244
4245         sdata_info(sdata,
4246                    "deauthenticating from %pM by local choice (reason=%d)\n",
4247                    req->bssid, req->reason_code);
4248
4249         if (ifmgd->auth_data) {
4250                 drv_mgd_prepare_tx(sdata->local, sdata);
4251                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4252                                                IEEE80211_STYPE_DEAUTH,
4253                                                req->reason_code, tx,
4254                                                frame_buf);
4255                 ieee80211_destroy_auth_data(sdata, false);
4256                 mutex_unlock(&ifmgd->mtx);
4257
4258                 sent_frame = tx;
4259                 goto out;
4260         }
4261
4262         if (ifmgd->associated &&
4263             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4264                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4265                                        req->reason_code, tx, frame_buf);
4266                 sent_frame = tx;
4267         }
4268         mutex_unlock(&ifmgd->mtx);
4269
4270  out:
4271         if (sent_frame)
4272                 __cfg80211_send_deauth(sdata->dev, frame_buf,
4273                                        IEEE80211_DEAUTH_FRAME_LEN);
4274
4275         return 0;
4276 }
4277
4278 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4279                            struct cfg80211_disassoc_request *req)
4280 {
4281         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4282         u8 bssid[ETH_ALEN];
4283         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4284
4285         mutex_lock(&ifmgd->mtx);
4286
4287         /*
4288          * cfg80211 should catch this ... but it's racy since
4289          * we can receive a disassoc frame, process it, hand it
4290          * to cfg80211 while that's in a locked section already
4291          * trying to tell us that the user wants to disconnect.
4292          */
4293         if (ifmgd->associated != req->bss) {
4294                 mutex_unlock(&ifmgd->mtx);
4295                 return -ENOLINK;
4296         }
4297
4298         sdata_info(sdata,
4299                    "disassociating from %pM by local choice (reason=%d)\n",
4300                    req->bss->bssid, req->reason_code);
4301
4302         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4303         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4304                                req->reason_code, !req->local_state_change,
4305                                frame_buf);
4306         mutex_unlock(&ifmgd->mtx);
4307
4308         __cfg80211_send_disassoc(sdata->dev, frame_buf,
4309                                  IEEE80211_DEAUTH_FRAME_LEN);
4310
4311         return 0;
4312 }
4313
4314 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4315 {
4316         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4317
4318         mutex_lock(&ifmgd->mtx);
4319         if (ifmgd->assoc_data)
4320                 ieee80211_destroy_assoc_data(sdata, false);
4321         if (ifmgd->auth_data)
4322                 ieee80211_destroy_auth_data(sdata, false);
4323         del_timer_sync(&ifmgd->timer);
4324         mutex_unlock(&ifmgd->mtx);
4325 }
4326
4327 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4328                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4329                                gfp_t gfp)
4330 {
4331         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4332
4333         trace_api_cqm_rssi_notify(sdata, rssi_event);
4334
4335         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4336 }
4337 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);