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 static int beacon_loss_count = 7;
  60 module_param(beacon_loss_count, int, 0644);
  61 MODULE_PARM_DESC(beacon_loss_count,
  62                  "Number of beacon intervals before we decide beacon was lost.");
  63
  64 /*
  65  * Time the connection can be idle before we probe
  66  * it to see if we can still talk to the AP.
  67  */
  68 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  69 /*
  70  * Time we wait for a probe response after sending
  71  * a probe request because of beacon loss or for
  72  * checking the connection still works.
  73  */
  74 static int probe_wait_ms = 500;
  75 module_param(probe_wait_ms, int, 0644);
  76 MODULE_PARM_DESC(probe_wait_ms,
  77                  "Maximum time(ms) to wait for probe response"
  78                  " before disconnecting (reason 4).");
  79
  80 /*
  81  * Weight given to the latest Beacon frame when calculating average signal
  82  * strength for Beacon frames received in the current BSS. This must be
  83  * between 1 and 15.
  84  */
  85 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  86
  87 /*
  88  * How many Beacon frames need to have been used in average signal strength
  89  * before starting to indicate signal change events.
  90  */
  91 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  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                 /* also mark 40 MHz disabled */
 293                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 294                 goto out;
 295         }
 296
 297         if (!vht_oper || !sband->vht_cap.vht_supported) {
 298                 ret = IEEE80211_STA_DISABLE_VHT;
 299                 goto out;
 300         }
 301
 302         vht_chandef.chan = channel;
 303         vht_chandef.center_freq1 =
 304                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 305                                                channel->band);
 306         vht_chandef.center_freq2 = 0;
 307
 308         switch (vht_oper->chan_width) {
 309         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 310                 vht_chandef.width = chandef->width;
 311                 break;
 312         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 313                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 314                 break;
 315         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 316                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 317                 break;
 318         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 319                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 320                 vht_chandef.center_freq2 =
 321                         ieee80211_channel_to_frequency(
 322                                 vht_oper->center_freq_seg2_idx,
 323                                 channel->band);
 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
 608         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 609
 610         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 611         ieee80211_apply_vhtcap_overrides(sdata, &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         /* reserve and fill IE */
 635         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 636         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 637 }
 638
 639 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 640 {
 641         struct ieee80211_local *local = sdata->local;
 642         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 643         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 644         struct sk_buff *skb;
 645         struct ieee80211_mgmt *mgmt;
 646         u8 *pos, qos_info;
 647         size_t offset = 0, noffset;
 648         int i, count, rates_len, supp_rates_len;
 649         u16 capab;
 650         struct ieee80211_supported_band *sband;
 651         struct ieee80211_chanctx_conf *chanctx_conf;
 652         struct ieee80211_channel *chan;
 653         u32 rates = 0;
 654
 655         lockdep_assert_held(&ifmgd->mtx);
 656
 657         rcu_read_lock();
 658         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 659         if (WARN_ON(!chanctx_conf)) {
 660                 rcu_read_unlock();
 661                 return;
 662         }
 663         chan = chanctx_conf->def.chan;
 664         rcu_read_unlock();
 665         sband = local->hw.wiphy->bands[chan->band];
 666
 667         if (assoc_data->supp_rates_len) {
 668                 /*
 669                  * Get all rates supported by the device and the AP as
 670                  * some APs don't like getting a superset of their rates
 671                  * in the association request (e.g. D-Link DAP 1353 in
 672                  * b-only mode)...
 673                  */
 674                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 675                                                        assoc_data->supp_rates_len,
 676                                                        sband, &rates);
 677         } else {
 678                 /*
 679                  * In case AP not provide any supported rates information
 680                  * before association, we send information element(s) with
 681                  * all rates that we support.
 682                  */
 683                 rates = ~0;
 684                 rates_len = sband->n_bitrates;
 685         }
 686
 687         skb = alloc_skb(local->hw.extra_tx_headroom +
 688                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 689                         2 + assoc_data->ssid_len + /* SSID */
 690                         4 + rates_len + /* (extended) rates */
 691                         4 + /* power capability */
 692                         2 + 2 * sband->n_channels + /* supported channels */
 693                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 694                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 695                         assoc_data->ie_len + /* extra IEs */
 696                         9, /* WMM */
 697                         GFP_KERNEL);
 698         if (!skb)
 699                 return;
 700
 701         skb_reserve(skb, local->hw.extra_tx_headroom);
 702
 703         capab = WLAN_CAPABILITY_ESS;
 704
 705         if (sband->band == IEEE80211_BAND_2GHZ) {
 706                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 707                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 708                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 709                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 710         }
 711
 712         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 713                 capab |= WLAN_CAPABILITY_PRIVACY;
 714
 715         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 716             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 717                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 718
 719         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 720         memset(mgmt, 0, 24);
 721         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 722         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 723         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 724
 725         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 726                 skb_put(skb, 10);
 727                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 728                                                   IEEE80211_STYPE_REASSOC_REQ);
 729                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 730                 mgmt->u.reassoc_req.listen_interval =
 731                                 cpu_to_le16(local->hw.conf.listen_interval);
 732                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 733                        ETH_ALEN);
 734         } else {
 735                 skb_put(skb, 4);
 736                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 737                                                   IEEE80211_STYPE_ASSOC_REQ);
 738                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 739                 mgmt->u.assoc_req.listen_interval =
 740                                 cpu_to_le16(local->hw.conf.listen_interval);
 741         }
 742
 743         /* SSID */
 744         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 745         *pos++ = WLAN_EID_SSID;
 746         *pos++ = assoc_data->ssid_len;
 747         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 748
 749         /* add all rates which were marked to be used above */
 750         supp_rates_len = rates_len;
 751         if (supp_rates_len > 8)
 752                 supp_rates_len = 8;
 753
 754         pos = skb_put(skb, supp_rates_len + 2);
 755         *pos++ = WLAN_EID_SUPP_RATES;
 756         *pos++ = supp_rates_len;
 757
 758         count = 0;
 759         for (i = 0; i < sband->n_bitrates; i++) {
 760                 if (BIT(i) & rates) {
 761                         int rate = sband->bitrates[i].bitrate;
 762                         *pos++ = (u8) (rate / 5);
 763                         if (++count == 8)
 764                                 break;
 765                 }
 766         }
 767
 768         if (rates_len > count) {
 769                 pos = skb_put(skb, rates_len - count + 2);
 770                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 771                 *pos++ = rates_len - count;
 772
 773                 for (i++; i < sband->n_bitrates; i++) {
 774                         if (BIT(i) & rates) {
 775                                 int rate = sband->bitrates[i].bitrate;
 776                                 *pos++ = (u8) (rate / 5);
 777                         }
 778                 }
 779         }
 780
 781         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 782                 /* 1. power capabilities */
 783                 pos = skb_put(skb, 4);
 784                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 785                 *pos++ = 2;
 786                 *pos++ = 0; /* min tx power */
 787                 *pos++ = chan->max_power; /* max tx power */
 788
 789                 /* 2. supported channels */
 790                 /* TODO: get this in reg domain format */
 791                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 792                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 793                 *pos++ = 2 * sband->n_channels;
 794                 for (i = 0; i < sband->n_channels; i++) {
 795                         *pos++ = ieee80211_frequency_to_channel(
 796                                         sband->channels[i].center_freq);
 797                         *pos++ = 1; /* one channel in the subband*/
 798                 }
 799         }
 800
 801         /* if present, add any custom IEs that go before HT */
 802         if (assoc_data->ie_len && assoc_data->ie) {
 803                 static const u8 before_ht[] = {
 804                         WLAN_EID_SSID,
 805                         WLAN_EID_SUPP_RATES,
 806                         WLAN_EID_EXT_SUPP_RATES,
 807                         WLAN_EID_PWR_CAPABILITY,
 808                         WLAN_EID_SUPPORTED_CHANNELS,
 809                         WLAN_EID_RSN,
 810                         WLAN_EID_QOS_CAPA,
 811                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 812                         WLAN_EID_MOBILITY_DOMAIN,
 813                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 814                 };
 815                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 816                                              before_ht, ARRAY_SIZE(before_ht),
 817                                              offset);
 818                 pos = skb_put(skb, noffset - offset);
 819                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 820                 offset = noffset;
 821         }
 822
 823         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 824                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 825                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 826
 827         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 828                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 829                                     sband, chan, sdata->smps_mode);
 830
 831         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 832                 ieee80211_add_vht_ie(sdata, skb, sband,
 833                                      &assoc_data->ap_vht_cap);
 834
 835         /* if present, add any custom non-vendor IEs that go after HT */
 836         if (assoc_data->ie_len && assoc_data->ie) {
 837                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 838                                                     assoc_data->ie_len,
 839                                                     offset);
 840                 pos = skb_put(skb, noffset - offset);
 841                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 842                 offset = noffset;
 843         }
 844
 845         if (assoc_data->wmm) {
 846                 if (assoc_data->uapsd) {
 847                         qos_info = ifmgd->uapsd_queues;
 848                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 849                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 850                 } else {
 851                         qos_info = 0;
 852                 }
 853
 854                 pos = skb_put(skb, 9);
 855                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 856                 *pos++ = 7; /* len */
 857                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 858                 *pos++ = 0x50;
 859                 *pos++ = 0xf2;
 860                 *pos++ = 2; /* WME */
 861                 *pos++ = 0; /* WME info */
 862                 *pos++ = 1; /* WME ver */
 863                 *pos++ = qos_info;
 864         }
 865
 866         /* add any remaining custom (i.e. vendor specific here) IEs */
 867         if (assoc_data->ie_len && assoc_data->ie) {
 868                 noffset = assoc_data->ie_len;
 869                 pos = skb_put(skb, noffset - offset);
 870                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 871         }
 872
 873         drv_mgd_prepare_tx(local, sdata);
 874
 875         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 876         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 877                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 878                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 879         ieee80211_tx_skb(sdata, skb);
 880 }
 881
 882 void ieee80211_send_pspoll(struct ieee80211_local *local,
 883                            struct ieee80211_sub_if_data *sdata)
 884 {
 885         struct ieee80211_pspoll *pspoll;
 886         struct sk_buff *skb;
 887
 888         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 889         if (!skb)
 890                 return;
 891
 892         pspoll = (struct ieee80211_pspoll *) skb->data;
 893         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 894
 895         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 896         ieee80211_tx_skb(sdata, skb);
 897 }
 898
 899 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 900                              struct ieee80211_sub_if_data *sdata,
 901                              int powersave)
 902 {
 903         struct sk_buff *skb;
 904         struct ieee80211_hdr_3addr *nullfunc;
 905         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 906
 907         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 908         if (!skb)
 909                 return;
 910
 911         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 912         if (powersave)
 913                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 914
 915         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 916                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 917         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 918                             IEEE80211_STA_CONNECTION_POLL))
 919                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 920
 921         ieee80211_tx_skb(sdata, skb);
 922 }
 923
 924 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 925                                           struct ieee80211_sub_if_data *sdata)
 926 {
 927         struct sk_buff *skb;
 928         struct ieee80211_hdr *nullfunc;
 929         __le16 fc;
 930
 931         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 932                 return;
 933
 934         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 935         if (!skb)
 936                 return;
 937
 938         skb_reserve(skb, local->hw.extra_tx_headroom);
 939
 940         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 941         memset(nullfunc, 0, 30);
 942         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 943                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 944         nullfunc->frame_control = fc;
 945         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 946         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 947         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 948         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 949
 950         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 951         ieee80211_tx_skb(sdata, skb);
 952 }
 953
 954 /* spectrum management related things */
 955 static void ieee80211_chswitch_work(struct work_struct *work)
 956 {
 957         struct ieee80211_sub_if_data *sdata =
 958                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 959         struct ieee80211_local *local = sdata->local;
 960         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 961
 962         if (!ieee80211_sdata_running(sdata))
 963                 return;
 964
 965         mutex_lock(&ifmgd->mtx);
 966         if (!ifmgd->associated)
 967                 goto out;
 968
 969         local->_oper_chandef = local->csa_chandef;
 970
 971         if (!local->ops->channel_switch) {
 972                 /* call "hw_config" only if doing sw channel switch */
 973                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 974         } else {
 975                 /* update the device channel directly */
 976                 local->hw.conf.chandef = local->_oper_chandef;
 977         }
 978
 979         /* XXX: shouldn't really modify cfg80211-owned data! */
 980         ifmgd->associated->channel = local->_oper_chandef.chan;
 981
 982         /* XXX: wait for a beacon first? */
 983         ieee80211_wake_queues_by_reason(&local->hw,
 984                                         IEEE80211_MAX_QUEUE_MAP,
 985                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 986  out:
 987         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 988         mutex_unlock(&ifmgd->mtx);
 989 }
 990
 991 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 992 {
 993         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 994         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 995
 996         trace_api_chswitch_done(sdata, success);
 997         if (!success) {
 998                 sdata_info(sdata,
 999                            "driver channel switch failed, disconnecting\n");
1000                 ieee80211_queue_work(&sdata->local->hw,
1001                                      &ifmgd->csa_connection_drop_work);
1002         } else {
1003                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1004         }
1005 }
1006 EXPORT_SYMBOL(ieee80211_chswitch_done);
1007
1008 static void ieee80211_chswitch_timer(unsigned long data)
1009 {
1010         struct ieee80211_sub_if_data *sdata =
1011                 (struct ieee80211_sub_if_data *) data;
1012
1013         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1014 }
1015
1016 static void
1017 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1018                                  u64 timestamp, struct ieee802_11_elems *elems,
1019                                  bool beacon)
1020 {
1021         struct ieee80211_local *local = sdata->local;
1022         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1023         struct cfg80211_bss *cbss = ifmgd->associated;
1024         struct ieee80211_bss *bss;
1025         struct ieee80211_chanctx *chanctx;
1026         enum ieee80211_band new_band;
1027         int new_freq;
1028         u8 new_chan_no;
1029         u8 count;
1030         u8 mode;
1031         struct ieee80211_channel *new_chan;
1032         struct cfg80211_chan_def new_chandef = {};
1033         struct cfg80211_chan_def new_vht_chandef = {};
1034         const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
1035         const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
1036         const struct ieee80211_ht_operation *ht_oper;
1037         int secondary_channel_offset = -1;
1038
1039         ASSERT_MGD_MTX(ifmgd);
1040
1041         if (!cbss)
1042                 return;
1043
1044         if (local->scanning)
1045                 return;
1046
1047         /* disregard subsequent announcements if we are already processing */
1048         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
1049                 return;
1050
1051         sec_chan_offs = elems->sec_chan_offs;
1052         wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
1053         ht_oper = elems->ht_operation;
1054
1055         if (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
1056                             IEEE80211_STA_DISABLE_40MHZ)) {
1057                 sec_chan_offs = NULL;
1058                 wide_bw_chansw_ie = NULL;
1059                 /* only used for bandwidth here */
1060                 ht_oper = NULL;
1061         }
1062
1063         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
1064                 wide_bw_chansw_ie = NULL;
1065
1066         if (elems->ext_chansw_ie) {
1067                 if (!ieee80211_operating_class_to_band(
1068                                 elems->ext_chansw_ie->new_operating_class,
1069                                 &new_band)) {
1070                         sdata_info(sdata,
1071                                    "cannot understand ECSA IE operating class %d, disconnecting\n",
1072                                    elems->ext_chansw_ie->new_operating_class);
1073                         ieee80211_queue_work(&local->hw,
1074                                              &ifmgd->csa_connection_drop_work);
1075                 }
1076                 new_chan_no = elems->ext_chansw_ie->new_ch_num;
1077                 count = elems->ext_chansw_ie->count;
1078                 mode = elems->ext_chansw_ie->mode;
1079         } else if (elems->ch_switch_ie) {
1080                 new_band = cbss->channel->band;
1081                 new_chan_no = elems->ch_switch_ie->new_ch_num;
1082                 count = elems->ch_switch_ie->count;
1083                 mode = elems->ch_switch_ie->mode;
1084         } else {
1085                 /* nothing here we understand */
1086                 return;
1087         }
1088
1089         bss = (void *)cbss->priv;
1090
1091         new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
1092         new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
1093         if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
1094                 sdata_info(sdata,
1095                            "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
1096                            ifmgd->associated->bssid, new_freq);
1097                 ieee80211_queue_work(&local->hw,
1098                                      &ifmgd->csa_connection_drop_work);
1099                 return;
1100         }
1101
1102         if (!beacon && sec_chan_offs) {
1103                 secondary_channel_offset = sec_chan_offs->sec_chan_offs;
1104         } else if (beacon && ht_oper) {
1105                 secondary_channel_offset =
1106                         ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET;
1107         } else if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
1108                 /*
1109                  * If it's not a beacon, HT is enabled and the IE not present,
1110                  * it's 20 MHz, 802.11-2012 8.5.2.6:
1111                  *      This element [the Secondary Channel Offset Element] is
1112                  *      present when switching to a 40 MHz channel. It may be
1113                  *      present when switching to a 20 MHz channel (in which
1114                  *      case the secondary channel offset is set to SCN).
1115                  */
1116                 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1117         }
1118
1119         switch (secondary_channel_offset) {
1120         default:
1121                 /* secondary_channel_offset was present but is invalid */
1122         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1123                 cfg80211_chandef_create(&new_chandef, new_chan,
1124                                         NL80211_CHAN_HT20);
1125                 break;
1126         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1127                 cfg80211_chandef_create(&new_chandef, new_chan,
1128                                         NL80211_CHAN_HT40PLUS);
1129                 break;
1130         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1131                 cfg80211_chandef_create(&new_chandef, new_chan,
1132                                         NL80211_CHAN_HT40MINUS);
1133                 break;
1134         case -1:
1135                 cfg80211_chandef_create(&new_chandef, new_chan,
1136                                         NL80211_CHAN_NO_HT);
1137                 break;
1138         }
1139
1140         if (wide_bw_chansw_ie) {
1141                 new_vht_chandef.chan = new_chan;
1142                 new_vht_chandef.center_freq1 =
1143                         ieee80211_channel_to_frequency(
1144                                 wide_bw_chansw_ie->new_center_freq_seg0,
1145                                 new_band);
1146
1147                 switch (wide_bw_chansw_ie->new_channel_width) {
1148                 default:
1149                         /* hmmm, ignore VHT and use HT if present */
1150                 case IEEE80211_VHT_CHANWIDTH_USE_HT:
1151                         new_vht_chandef.chan = NULL;
1152                         break;
1153                 case IEEE80211_VHT_CHANWIDTH_80MHZ:
1154                         new_vht_chandef.width = NL80211_CHAN_WIDTH_80;
1155                         break;
1156                 case IEEE80211_VHT_CHANWIDTH_160MHZ:
1157                         new_vht_chandef.width = NL80211_CHAN_WIDTH_160;
1158                         break;
1159                 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
1160                         /* field is otherwise reserved */
1161                         new_vht_chandef.center_freq2 =
1162                                 ieee80211_channel_to_frequency(
1163                                         wide_bw_chansw_ie->new_center_freq_seg1,
1164                                         new_band);
1165                         new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
1166                         break;
1167                 }
1168                 if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
1169                     new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
1170                         chandef_downgrade(&new_vht_chandef);
1171                 if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
1172                     new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
1173                         chandef_downgrade(&new_vht_chandef);
1174                 if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
1175                     new_vht_chandef.width > NL80211_CHAN_WIDTH_20)
1176                         chandef_downgrade(&new_vht_chandef);
1177         }
1178
1179         /* if VHT data is there validate & use it */
1180         if (new_vht_chandef.chan) {
1181                 if (!cfg80211_chandef_compatible(&new_vht_chandef,
1182                                                  &new_chandef)) {
1183                         sdata_info(sdata,
1184                                    "AP %pM CSA has inconsistent channel data, disconnecting\n",
1185                                    ifmgd->associated->bssid);
1186                         ieee80211_queue_work(&local->hw,
1187                                              &ifmgd->csa_connection_drop_work);
1188                         return;
1189                 }
1190                 new_chandef = new_vht_chandef;
1191         }
1192
1193         if (!cfg80211_chandef_usable(local->hw.wiphy, &new_chandef,
1194                                      IEEE80211_CHAN_DISABLED)) {
1195                 sdata_info(sdata,
1196                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1197                            ifmgd->associated->bssid, new_freq,
1198                            new_chandef.width, new_chandef.center_freq1,
1199                            new_chandef.center_freq2);
1200                 ieee80211_queue_work(&local->hw,
1201                                      &ifmgd->csa_connection_drop_work);
1202                 return;
1203         }
1204
1205         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1206
1207         if (local->use_chanctx) {
1208                 sdata_info(sdata,
1209                            "not handling channel switch with channel contexts\n");
1210                 ieee80211_queue_work(&local->hw,
1211                                      &ifmgd->csa_connection_drop_work);
1212                 return;
1213         }
1214
1215         mutex_lock(&local->chanctx_mtx);
1216         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1217                 mutex_unlock(&local->chanctx_mtx);
1218                 return;
1219         }
1220         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1221                                struct ieee80211_chanctx, conf);
1222         if (chanctx->refcount > 1) {
1223                 sdata_info(sdata,
1224                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
1225                 ieee80211_queue_work(&local->hw,
1226                                      &ifmgd->csa_connection_drop_work);
1227                 mutex_unlock(&local->chanctx_mtx);
1228                 return;
1229         }
1230         mutex_unlock(&local->chanctx_mtx);
1231
1232         local->csa_chandef = new_chandef;
1233
1234         if (mode)
1235                 ieee80211_stop_queues_by_reason(&local->hw,
1236                                 IEEE80211_MAX_QUEUE_MAP,
1237                                 IEEE80211_QUEUE_STOP_REASON_CSA);
1238
1239         if (local->ops->channel_switch) {
1240                 /* use driver's channel switch callback */
1241                 struct ieee80211_channel_switch ch_switch = {
1242                         .timestamp = timestamp,
1243                         .block_tx = mode,
1244                         .chandef = new_chandef,
1245                         .count = count,
1246                 };
1247
1248                 drv_channel_switch(local, &ch_switch);
1249                 return;
1250         }
1251
1252         /* channel switch handled in software */
1253         if (count <= 1)
1254                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1255         else
1256                 mod_timer(&ifmgd->chswitch_timer,
1257                           TU_TO_EXP_TIME(count * cbss->beacon_interval));
1258 }
1259
1260 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1261                                        struct ieee80211_channel *channel,
1262                                        const u8 *country_ie, u8 country_ie_len,
1263                                        const u8 *pwr_constr_elem)
1264 {
1265         struct ieee80211_country_ie_triplet *triplet;
1266         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1267         int i, chan_pwr, chan_increment, new_ap_level;
1268         bool have_chan_pwr = false;
1269
1270         /* Invalid IE */
1271         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1272                 return 0;
1273
1274         triplet = (void *)(country_ie + 3);
1275         country_ie_len -= 3;
1276
1277         switch (channel->band) {
1278         default:
1279                 WARN_ON_ONCE(1);
1280                 /* fall through */
1281         case IEEE80211_BAND_2GHZ:
1282         case IEEE80211_BAND_60GHZ:
1283                 chan_increment = 1;
1284                 break;
1285         case IEEE80211_BAND_5GHZ:
1286                 chan_increment = 4;
1287                 break;
1288         }
1289
1290         /* find channel */
1291         while (country_ie_len >= 3) {
1292                 u8 first_channel = triplet->chans.first_channel;
1293
1294                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1295                         goto next;
1296
1297                 for (i = 0; i < triplet->chans.num_channels; i++) {
1298                         if (first_channel + i * chan_increment == chan) {
1299                                 have_chan_pwr = true;
1300                                 chan_pwr = triplet->chans.max_power;
1301                                 break;
1302                         }
1303                 }
1304                 if (have_chan_pwr)
1305                         break;
1306
1307  next:
1308                 triplet++;
1309                 country_ie_len -= 3;
1310         }
1311
1312         if (!have_chan_pwr)
1313                 return 0;
1314
1315         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1316
1317         if (sdata->ap_power_level == new_ap_level)
1318                 return 0;
1319
1320         sdata_info(sdata,
1321                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1322                    new_ap_level, chan_pwr, *pwr_constr_elem,
1323                    sdata->u.mgd.bssid);
1324         sdata->ap_power_level = new_ap_level;
1325         if (__ieee80211_recalc_txpower(sdata))
1326                 return BSS_CHANGED_TXPOWER;
1327         return 0;
1328 }
1329
1330 /* powersave */
1331 static void ieee80211_enable_ps(struct ieee80211_local *local,
1332                                 struct ieee80211_sub_if_data *sdata)
1333 {
1334         struct ieee80211_conf *conf = &local->hw.conf;
1335
1336         /*
1337          * If we are scanning right now then the parameters will
1338          * take effect when scan finishes.
1339          */
1340         if (local->scanning)
1341                 return;
1342
1343         if (conf->dynamic_ps_timeout > 0 &&
1344             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1345                 mod_timer(&local->dynamic_ps_timer, jiffies +
1346                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1347         } else {
1348                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1349                         ieee80211_send_nullfunc(local, sdata, 1);
1350
1351                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1352                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1353                         return;
1354
1355                 conf->flags |= IEEE80211_CONF_PS;
1356                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1357         }
1358 }
1359
1360 static void ieee80211_change_ps(struct ieee80211_local *local)
1361 {
1362         struct ieee80211_conf *conf = &local->hw.conf;
1363
1364         if (local->ps_sdata) {
1365                 ieee80211_enable_ps(local, local->ps_sdata);
1366         } else if (conf->flags & IEEE80211_CONF_PS) {
1367                 conf->flags &= ~IEEE80211_CONF_PS;
1368                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1369                 del_timer_sync(&local->dynamic_ps_timer);
1370                 cancel_work_sync(&local->dynamic_ps_enable_work);
1371         }
1372 }
1373
1374 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1375 {
1376         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1377         struct sta_info *sta = NULL;
1378         bool authorized = false;
1379
1380         if (!mgd->powersave)
1381                 return false;
1382
1383         if (mgd->broken_ap)
1384                 return false;
1385
1386         if (!mgd->associated)
1387                 return false;
1388
1389         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
1390                           IEEE80211_STA_CONNECTION_POLL))
1391                 return false;
1392
1393         rcu_read_lock();
1394         sta = sta_info_get(sdata, mgd->bssid);
1395         if (sta)
1396                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1397         rcu_read_unlock();
1398
1399         return authorized;
1400 }
1401
1402 /* need to hold RTNL or interface lock */
1403 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1404 {
1405         struct ieee80211_sub_if_data *sdata, *found = NULL;
1406         int count = 0;
1407         int timeout;
1408
1409         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1410                 local->ps_sdata = NULL;
1411                 return;
1412         }
1413
1414         list_for_each_entry(sdata, &local->interfaces, list) {
1415                 if (!ieee80211_sdata_running(sdata))
1416                         continue;
1417                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1418                         /* If an AP vif is found, then disable PS
1419                          * by setting the count to zero thereby setting
1420                          * ps_sdata to NULL.
1421                          */
1422                         count = 0;
1423                         break;
1424                 }
1425                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1426                         continue;
1427                 found = sdata;
1428                 count++;
1429         }
1430
1431         if (count == 1 && ieee80211_powersave_allowed(found)) {
1432                 s32 beaconint_us;
1433
1434                 if (latency < 0)
1435                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1436
1437                 beaconint_us = ieee80211_tu_to_usec(
1438                                         found->vif.bss_conf.beacon_int);
1439
1440                 timeout = local->dynamic_ps_forced_timeout;
1441                 if (timeout < 0) {
1442                         /*
1443                          * Go to full PSM if the user configures a very low
1444                          * latency requirement.
1445                          * The 2000 second value is there for compatibility
1446                          * until the PM_QOS_NETWORK_LATENCY is configured
1447                          * with real values.
1448                          */
1449                         if (latency > (1900 * USEC_PER_MSEC) &&
1450                             latency != (2000 * USEC_PER_SEC))
1451                                 timeout = 0;
1452                         else
1453                                 timeout = 100;
1454                 }
1455                 local->hw.conf.dynamic_ps_timeout = timeout;
1456
1457                 if (beaconint_us > latency) {
1458                         local->ps_sdata = NULL;
1459                 } else {
1460                         int maxslp = 1;
1461                         u8 dtimper = found->u.mgd.dtim_period;
1462
1463                         /* If the TIM IE is invalid, pretend the value is 1 */
1464                         if (!dtimper)
1465                                 dtimper = 1;
1466                         else if (dtimper > 1)
1467                                 maxslp = min_t(int, dtimper,
1468                                                     latency / beaconint_us);
1469
1470                         local->hw.conf.max_sleep_period = maxslp;
1471                         local->hw.conf.ps_dtim_period = dtimper;
1472                         local->ps_sdata = found;
1473                 }
1474         } else {
1475                 local->ps_sdata = NULL;
1476         }
1477
1478         ieee80211_change_ps(local);
1479 }
1480
1481 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1482 {
1483         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1484
1485         if (sdata->vif.bss_conf.ps != ps_allowed) {
1486                 sdata->vif.bss_conf.ps = ps_allowed;
1487                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1488         }
1489 }
1490
1491 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1492 {
1493         struct ieee80211_local *local =
1494                 container_of(work, struct ieee80211_local,
1495                              dynamic_ps_disable_work);
1496
1497         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1498                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1499                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1500         }
1501
1502         ieee80211_wake_queues_by_reason(&local->hw,
1503                                         IEEE80211_MAX_QUEUE_MAP,
1504                                         IEEE80211_QUEUE_STOP_REASON_PS);
1505 }
1506
1507 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1508 {
1509         struct ieee80211_local *local =
1510                 container_of(work, struct ieee80211_local,
1511                              dynamic_ps_enable_work);
1512         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1513         struct ieee80211_if_managed *ifmgd;
1514         unsigned long flags;
1515         int q;
1516
1517         /* can only happen when PS was just disabled anyway */
1518         if (!sdata)
1519                 return;
1520
1521         ifmgd = &sdata->u.mgd;
1522
1523         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1524                 return;
1525
1526         if (local->hw.conf.dynamic_ps_timeout > 0) {
1527                 /* don't enter PS if TX frames are pending */
1528                 if (drv_tx_frames_pending(local)) {
1529                         mod_timer(&local->dynamic_ps_timer, jiffies +
1530                                   msecs_to_jiffies(
1531                                   local->hw.conf.dynamic_ps_timeout));
1532                         return;
1533                 }
1534
1535                 /*
1536                  * transmission can be stopped by others which leads to
1537                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1538                  * is not the actual idle state.
1539                  */
1540                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1541                 for (q = 0; q < local->hw.queues; q++) {
1542                         if (local->queue_stop_reasons[q]) {
1543                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1544                                                        flags);
1545                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1546                                           msecs_to_jiffies(
1547                                           local->hw.conf.dynamic_ps_timeout));
1548                                 return;
1549                         }
1550                 }
1551                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1552         }
1553
1554         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1555             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1556                 if (drv_tx_frames_pending(local)) {
1557                         mod_timer(&local->dynamic_ps_timer, jiffies +
1558                                   msecs_to_jiffies(
1559                                   local->hw.conf.dynamic_ps_timeout));
1560                 } else {
1561                         ieee80211_send_nullfunc(local, sdata, 1);
1562                         /* Flush to get the tx status of nullfunc frame */
1563                         ieee80211_flush_queues(local, sdata);
1564                 }
1565         }
1566
1567         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1568               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1569             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1570                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1571                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1572                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1573         }
1574 }
1575
1576 void ieee80211_dynamic_ps_timer(unsigned long data)
1577 {
1578         struct ieee80211_local *local = (void *) data;
1579
1580         if (local->quiescing || local->suspended)
1581                 return;
1582
1583         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1584 }
1585
1586 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1587 {
1588         struct delayed_work *delayed_work =
1589                 container_of(work, struct delayed_work, work);
1590         struct ieee80211_sub_if_data *sdata =
1591                 container_of(delayed_work, struct ieee80211_sub_if_data,
1592                              dfs_cac_timer_work);
1593
1594         ieee80211_vif_release_channel(sdata);
1595
1596         cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_FINISHED, GFP_KERNEL);
1597 }
1598
1599 /* MLME */
1600 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1601                                      struct ieee80211_sub_if_data *sdata,
1602                                      const u8 *wmm_param, size_t wmm_param_len)
1603 {
1604         struct ieee80211_tx_queue_params params;
1605         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1606         size_t left;
1607         int count;
1608         const u8 *pos;
1609         u8 uapsd_queues = 0;
1610
1611         if (!local->ops->conf_tx)
1612                 return false;
1613
1614         if (local->hw.queues < IEEE80211_NUM_ACS)
1615                 return false;
1616
1617         if (!wmm_param)
1618                 return false;
1619
1620         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1621                 return false;
1622
1623         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1624                 uapsd_queues = ifmgd->uapsd_queues;
1625
1626         count = wmm_param[6] & 0x0f;
1627         if (count == ifmgd->wmm_last_param_set)
1628                 return false;
1629         ifmgd->wmm_last_param_set = count;
1630
1631         pos = wmm_param + 8;
1632         left = wmm_param_len - 8;
1633
1634         memset(&params, 0, sizeof(params));
1635
1636         sdata->wmm_acm = 0;
1637         for (; left >= 4; left -= 4, pos += 4) {
1638                 int aci = (pos[0] >> 5) & 0x03;
1639                 int acm = (pos[0] >> 4) & 0x01;
1640                 bool uapsd = false;
1641                 int queue;
1642
1643                 switch (aci) {
1644                 case 1: /* AC_BK */
1645                         queue = 3;
1646                         if (acm)
1647                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1648                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1649                                 uapsd = true;
1650                         break;
1651                 case 2: /* AC_VI */
1652                         queue = 1;
1653                         if (acm)
1654                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1655                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1656                                 uapsd = true;
1657                         break;
1658                 case 3: /* AC_VO */
1659                         queue = 0;
1660                         if (acm)
1661                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1662                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1663                                 uapsd = true;
1664                         break;
1665                 case 0: /* AC_BE */
1666                 default:
1667                         queue = 2;
1668                         if (acm)
1669                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1670                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1671                                 uapsd = true;
1672                         break;
1673                 }
1674
1675                 params.aifs = pos[0] & 0x0f;
1676                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1677                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1678                 params.txop = get_unaligned_le16(pos + 2);
1679                 params.acm = acm;
1680                 params.uapsd = uapsd;
1681
1682                 mlme_dbg(sdata,
1683                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1684                          queue, aci, acm,
1685                          params.aifs, params.cw_min, params.cw_max,
1686                          params.txop, params.uapsd);
1687                 sdata->tx_conf[queue] = params;
1688                 if (drv_conf_tx(local, sdata, queue, &params))
1689                         sdata_err(sdata,
1690                                   "failed to set TX queue parameters for queue %d\n",
1691                                   queue);
1692         }
1693
1694         /* enable WMM or activate new settings */
1695         sdata->vif.bss_conf.qos = true;
1696         return true;
1697 }
1698
1699 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1700 {
1701         lockdep_assert_held(&sdata->local->mtx);
1702
1703         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1704                                 IEEE80211_STA_BEACON_POLL);
1705         ieee80211_run_deferred_scan(sdata->local);
1706 }
1707
1708 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1709 {
1710         mutex_lock(&sdata->local->mtx);
1711         __ieee80211_stop_poll(sdata);
1712         mutex_unlock(&sdata->local->mtx);
1713 }
1714
1715 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1716                                            u16 capab, bool erp_valid, u8 erp)
1717 {
1718         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1719         u32 changed = 0;
1720         bool use_protection;
1721         bool use_short_preamble;
1722         bool use_short_slot;
1723
1724         if (erp_valid) {
1725                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1726                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1727         } else {
1728                 use_protection = false;
1729                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1730         }
1731
1732         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1733         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1734                 use_short_slot = true;
1735
1736         if (use_protection != bss_conf->use_cts_prot) {
1737                 bss_conf->use_cts_prot = use_protection;
1738                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1739         }
1740
1741         if (use_short_preamble != bss_conf->use_short_preamble) {
1742                 bss_conf->use_short_preamble = use_short_preamble;
1743                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1744         }
1745
1746         if (use_short_slot != bss_conf->use_short_slot) {
1747                 bss_conf->use_short_slot = use_short_slot;
1748                 changed |= BSS_CHANGED_ERP_SLOT;
1749         }
1750
1751         return changed;
1752 }
1753
1754 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1755                                      struct cfg80211_bss *cbss,
1756                                      u32 bss_info_changed)
1757 {
1758         struct ieee80211_bss *bss = (void *)cbss->priv;
1759         struct ieee80211_local *local = sdata->local;
1760         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1761
1762         bss_info_changed |= BSS_CHANGED_ASSOC;
1763         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1764                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1765
1766         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1767                 beacon_loss_count * bss_conf->beacon_int));
1768
1769         sdata->u.mgd.associated = cbss;
1770         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1771
1772         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1773
1774         if (sdata->vif.p2p) {
1775                 const struct cfg80211_bss_ies *ies;
1776
1777                 rcu_read_lock();
1778                 ies = rcu_dereference(cbss->ies);
1779                 if (ies) {
1780                         int ret;
1781
1782                         ret = cfg80211_get_p2p_attr(
1783                                         ies->data, ies->len,
1784                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1785                                         (u8 *) &bss_conf->p2p_noa_attr,
1786                                         sizeof(bss_conf->p2p_noa_attr));
1787                         if (ret >= 2) {
1788                                 sdata->u.mgd.p2p_noa_index =
1789                                         bss_conf->p2p_noa_attr.index;
1790                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1791                         }
1792                 }
1793                 rcu_read_unlock();
1794         }
1795
1796         /* just to be sure */
1797         ieee80211_stop_poll(sdata);
1798
1799         ieee80211_led_assoc(local, 1);
1800
1801         if (sdata->u.mgd.assoc_data->have_beacon) {
1802                 /*
1803                  * If the AP is buggy we may get here with no DTIM period
1804                  * known, so assume it's 1 which is the only safe assumption
1805                  * in that case, although if the TIM IE is broken powersave
1806                  * probably just won't work at all.
1807                  */
1808                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1809                 bss_info_changed |= BSS_CHANGED_DTIM_PERIOD;
1810         } else {
1811                 bss_conf->dtim_period = 0;
1812         }
1813
1814         bss_conf->assoc = 1;
1815
1816         /* Tell the driver to monitor connection quality (if supported) */
1817         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1818             bss_conf->cqm_rssi_thold)
1819                 bss_info_changed |= BSS_CHANGED_CQM;
1820
1821         /* Enable ARP filtering */
1822         if (bss_conf->arp_addr_cnt)
1823                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1824
1825         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1826
1827         mutex_lock(&local->iflist_mtx);
1828         ieee80211_recalc_ps(local, -1);
1829         mutex_unlock(&local->iflist_mtx);
1830
1831         ieee80211_recalc_smps(sdata);
1832         ieee80211_recalc_ps_vif(sdata);
1833
1834         netif_carrier_on(sdata->dev);
1835 }
1836
1837 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1838                                    u16 stype, u16 reason, bool tx,
1839                                    u8 *frame_buf)
1840 {
1841         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1842         struct ieee80211_local *local = sdata->local;
1843         u32 changed = 0;
1844
1845         ASSERT_MGD_MTX(ifmgd);
1846
1847         if (WARN_ON_ONCE(tx && !frame_buf))
1848                 return;
1849
1850         if (WARN_ON(!ifmgd->associated))
1851                 return;
1852
1853         ieee80211_stop_poll(sdata);
1854
1855         ifmgd->associated = NULL;
1856         netif_carrier_off(sdata->dev);
1857
1858         /*
1859          * if we want to get out of ps before disassoc (why?) we have
1860          * to do it before sending disassoc, as otherwise the null-packet
1861          * won't be valid.
1862          */
1863         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1864                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1865                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1866         }
1867         local->ps_sdata = NULL;
1868
1869         /* disable per-vif ps */
1870         ieee80211_recalc_ps_vif(sdata);
1871
1872         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1873         if (tx)
1874                 ieee80211_flush_queues(local, sdata);
1875
1876         /* deauthenticate/disassociate now */
1877         if (tx || frame_buf)
1878                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1879                                                reason, tx, frame_buf);
1880
1881         /* flush out frame */
1882         if (tx)
1883                 ieee80211_flush_queues(local, sdata);
1884
1885         /* clear bssid only after building the needed mgmt frames */
1886         memset(ifmgd->bssid, 0, ETH_ALEN);
1887
1888         /* remove AP and TDLS peers */
1889         sta_info_flush_defer(sdata);
1890
1891         /* finally reset all BSS / config parameters */
1892         changed |= ieee80211_reset_erp_info(sdata);
1893
1894         ieee80211_led_assoc(local, 0);
1895         changed |= BSS_CHANGED_ASSOC;
1896         sdata->vif.bss_conf.assoc = false;
1897
1898         ifmgd->p2p_noa_index = -1;
1899         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1900                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1901
1902         /* on the next assoc, re-program HT/VHT parameters */
1903         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1904         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1905         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1906         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1907
1908         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1909
1910         del_timer_sync(&local->dynamic_ps_timer);
1911         cancel_work_sync(&local->dynamic_ps_enable_work);
1912
1913         /* Disable ARP filtering */
1914         if (sdata->vif.bss_conf.arp_addr_cnt)
1915                 changed |= BSS_CHANGED_ARP_FILTER;
1916
1917         sdata->vif.bss_conf.qos = false;
1918         changed |= BSS_CHANGED_QOS;
1919
1920         /* The BSSID (not really interesting) and HT changed */
1921         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1922         ieee80211_bss_info_change_notify(sdata, changed);
1923
1924         /* disassociated - set to defaults now */
1925         ieee80211_set_wmm_default(sdata, false);
1926
1927         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1928         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1929         del_timer_sync(&sdata->u.mgd.timer);
1930         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1931
1932         sdata->vif.bss_conf.dtim_period = 0;
1933
1934         ifmgd->flags = 0;
1935         ieee80211_vif_release_channel(sdata);
1936 }
1937
1938 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1939                              struct ieee80211_hdr *hdr)
1940 {
1941         /*
1942          * We can postpone the mgd.timer whenever receiving unicast frames
1943          * from AP because we know that the connection is working both ways
1944          * at that time. But multicast frames (and hence also beacons) must
1945          * be ignored here, because we need to trigger the timer during
1946          * data idle periods for sending the periodic probe request to the
1947          * AP we're connected to.
1948          */
1949         if (is_multicast_ether_addr(hdr->addr1))
1950                 return;
1951
1952         ieee80211_sta_reset_conn_monitor(sdata);
1953 }
1954
1955 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1956 {
1957         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1958         struct ieee80211_local *local = sdata->local;
1959
1960         mutex_lock(&local->mtx);
1961         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1962                               IEEE80211_STA_CONNECTION_POLL))) {
1963                 mutex_unlock(&local->mtx);
1964                 return;
1965         }
1966
1967         __ieee80211_stop_poll(sdata);
1968
1969         mutex_lock(&local->iflist_mtx);
1970         ieee80211_recalc_ps(local, -1);
1971         mutex_unlock(&local->iflist_mtx);
1972
1973         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1974                 goto out;
1975
1976         /*
1977          * We've received a probe response, but are not sure whether
1978          * we have or will be receiving any beacons or data, so let's
1979          * schedule the timers again, just in case.
1980          */
1981         ieee80211_sta_reset_beacon_monitor(sdata);
1982
1983         mod_timer(&ifmgd->conn_mon_timer,
1984                   round_jiffies_up(jiffies +
1985                                    IEEE80211_CONNECTION_IDLE_TIME));
1986 out:
1987         mutex_unlock(&local->mtx);
1988 }
1989
1990 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1991                              struct ieee80211_hdr *hdr, bool ack)
1992 {
1993         if (!ieee80211_is_data(hdr->frame_control))
1994             return;
1995
1996         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1997             sdata->u.mgd.probe_send_count > 0) {
1998                 if (ack)
1999                         ieee80211_sta_reset_conn_monitor(sdata);
2000                 else
2001                         sdata->u.mgd.nullfunc_failed = true;
2002                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2003                 return;
2004         }
2005
2006         if (ack)
2007                 ieee80211_sta_reset_conn_monitor(sdata);
2008 }
2009
2010 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2011 {
2012         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2013         const u8 *ssid;
2014         u8 *dst = ifmgd->associated->bssid;
2015         u8 unicast_limit = max(1, max_probe_tries - 3);
2016
2017         /*
2018          * Try sending broadcast probe requests for the last three
2019          * probe requests after the first ones failed since some
2020          * buggy APs only support broadcast probe requests.
2021          */
2022         if (ifmgd->probe_send_count >= unicast_limit)
2023                 dst = NULL;
2024
2025         /*
2026          * When the hardware reports an accurate Tx ACK status, it's
2027          * better to send a nullfunc frame instead of a probe request,
2028          * as it will kick us off the AP quickly if we aren't associated
2029          * anymore. The timeout will be reset if the frame is ACKed by
2030          * the AP.
2031          */
2032         ifmgd->probe_send_count++;
2033
2034         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2035                 ifmgd->nullfunc_failed = false;
2036                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2037         } else {
2038                 int ssid_len;
2039
2040                 rcu_read_lock();
2041                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2042                 if (WARN_ON_ONCE(ssid == NULL))
2043                         ssid_len = 0;
2044                 else
2045                         ssid_len = ssid[1];
2046
2047                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
2048                                          0, (u32) -1, true, 0,
2049                                          ifmgd->associated->channel, false);
2050                 rcu_read_unlock();
2051         }
2052
2053         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2054         run_again(ifmgd, ifmgd->probe_timeout);
2055         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2056                 ieee80211_flush_queues(sdata->local, sdata);
2057 }
2058
2059 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2060                                    bool beacon)
2061 {
2062         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2063         bool already = false;
2064
2065         if (!ieee80211_sdata_running(sdata))
2066                 return;
2067
2068         mutex_lock(&ifmgd->mtx);
2069
2070         if (!ifmgd->associated)
2071                 goto out;
2072
2073         mutex_lock(&sdata->local->mtx);
2074
2075         if (sdata->local->tmp_channel || sdata->local->scanning) {
2076                 mutex_unlock(&sdata->local->mtx);
2077                 goto out;
2078         }
2079
2080         if (beacon) {
2081                 mlme_dbg_ratelimited(sdata,
2082                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2083                                      beacon_loss_count);
2084
2085                 ieee80211_cqm_rssi_notify(&sdata->vif,
2086                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
2087                                           GFP_KERNEL);
2088         }
2089
2090         /*
2091          * The driver/our work has already reported this event or the
2092          * connection monitoring has kicked in and we have already sent
2093          * a probe request. Or maybe the AP died and the driver keeps
2094          * reporting until we disassociate...
2095          *
2096          * In either case we have to ignore the current call to this
2097          * function (except for setting the correct probe reason bit)
2098          * because otherwise we would reset the timer every time and
2099          * never check whether we received a probe response!
2100          */
2101         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2102                             IEEE80211_STA_CONNECTION_POLL))
2103                 already = true;
2104
2105         if (beacon)
2106                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
2107         else
2108                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2109
2110         mutex_unlock(&sdata->local->mtx);
2111
2112         if (already)
2113                 goto out;
2114
2115         mutex_lock(&sdata->local->iflist_mtx);
2116         ieee80211_recalc_ps(sdata->local, -1);
2117         mutex_unlock(&sdata->local->iflist_mtx);
2118
2119         ifmgd->probe_send_count = 0;
2120         ieee80211_mgd_probe_ap_send(sdata);
2121  out:
2122         mutex_unlock(&ifmgd->mtx);
2123 }
2124
2125 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2126                                           struct ieee80211_vif *vif)
2127 {
2128         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2130         struct cfg80211_bss *cbss;
2131         struct sk_buff *skb;
2132         const u8 *ssid;
2133         int ssid_len;
2134
2135         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2136                 return NULL;
2137
2138         ASSERT_MGD_MTX(ifmgd);
2139
2140         if (ifmgd->associated)
2141                 cbss = ifmgd->associated;
2142         else if (ifmgd->auth_data)
2143                 cbss = ifmgd->auth_data->bss;
2144         else if (ifmgd->assoc_data)
2145                 cbss = ifmgd->assoc_data->bss;
2146         else
2147                 return NULL;
2148
2149         rcu_read_lock();
2150         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2151         if (WARN_ON_ONCE(ssid == NULL))
2152                 ssid_len = 0;
2153         else
2154                 ssid_len = ssid[1];
2155
2156         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2157                                         (u32) -1, cbss->channel,
2158                                         ssid + 2, ssid_len,
2159                                         NULL, 0, true);
2160         rcu_read_unlock();
2161
2162         return skb;
2163 }
2164 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2165
2166 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2167 {
2168         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2169         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2170
2171         mutex_lock(&ifmgd->mtx);
2172         if (!ifmgd->associated) {
2173                 mutex_unlock(&ifmgd->mtx);
2174                 return;
2175         }
2176
2177         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2178                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2179                                true, frame_buf);
2180         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2181         ieee80211_wake_queues_by_reason(&sdata->local->hw,
2182                                         IEEE80211_MAX_QUEUE_MAP,
2183                                         IEEE80211_QUEUE_STOP_REASON_CSA);
2184         mutex_unlock(&ifmgd->mtx);
2185
2186         /*
2187          * must be outside lock due to cfg80211,
2188          * but that's not a problem.
2189          */
2190         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2191 }
2192
2193 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2194 {
2195         struct ieee80211_sub_if_data *sdata =
2196                 container_of(work, struct ieee80211_sub_if_data,
2197                              u.mgd.beacon_connection_loss_work);
2198         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2199         struct sta_info *sta;
2200
2201         if (ifmgd->associated) {
2202                 rcu_read_lock();
2203                 sta = sta_info_get(sdata, ifmgd->bssid);
2204                 if (sta)
2205                         sta->beacon_loss_count++;
2206                 rcu_read_unlock();
2207         }
2208
2209         if (ifmgd->connection_loss) {
2210                 sdata_info(sdata, "Connection to AP %pM lost\n",
2211                            ifmgd->bssid);
2212                 __ieee80211_disconnect(sdata);
2213         } else {
2214                 ieee80211_mgd_probe_ap(sdata, true);
2215         }
2216 }
2217
2218 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2219 {
2220         struct ieee80211_sub_if_data *sdata =
2221                 container_of(work, struct ieee80211_sub_if_data,
2222                              u.mgd.csa_connection_drop_work);
2223
2224         __ieee80211_disconnect(sdata);
2225 }
2226
2227 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2228 {
2229         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2230         struct ieee80211_hw *hw = &sdata->local->hw;
2231
2232         trace_api_beacon_loss(sdata);
2233
2234         sdata->u.mgd.connection_loss = false;
2235         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2236 }
2237 EXPORT_SYMBOL(ieee80211_beacon_loss);
2238
2239 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2240 {
2241         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2242         struct ieee80211_hw *hw = &sdata->local->hw;
2243
2244         trace_api_connection_loss(sdata);
2245
2246         sdata->u.mgd.connection_loss = true;
2247         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2248 }
2249 EXPORT_SYMBOL(ieee80211_connection_loss);
2250
2251
2252 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2253                                         bool assoc)
2254 {
2255         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2256
2257         lockdep_assert_held(&sdata->u.mgd.mtx);
2258
2259         if (!assoc) {
2260                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2261
2262                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2263                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2264                 sdata->u.mgd.flags = 0;
2265                 ieee80211_vif_release_channel(sdata);
2266         }
2267
2268         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2269         kfree(auth_data);
2270         sdata->u.mgd.auth_data = NULL;
2271 }
2272
2273 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2274                                      struct ieee80211_mgmt *mgmt, size_t len)
2275 {
2276         struct ieee80211_local *local = sdata->local;
2277         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2278         u8 *pos;
2279         struct ieee802_11_elems elems;
2280         u32 tx_flags = 0;
2281
2282         pos = mgmt->u.auth.variable;
2283         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2284         if (!elems.challenge)
2285                 return;
2286         auth_data->expected_transaction = 4;
2287         drv_mgd_prepare_tx(sdata->local, sdata);
2288         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2289                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2290                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2291         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2292                             elems.challenge - 2, elems.challenge_len + 2,
2293                             auth_data->bss->bssid, auth_data->bss->bssid,
2294                             auth_data->key, auth_data->key_len,
2295                             auth_data->key_idx, tx_flags);
2296 }
2297
2298 static enum rx_mgmt_action __must_check
2299 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2300                        struct ieee80211_mgmt *mgmt, size_t len)
2301 {
2302         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2303         u8 bssid[ETH_ALEN];
2304         u16 auth_alg, auth_transaction, status_code;
2305         struct sta_info *sta;
2306
2307         lockdep_assert_held(&ifmgd->mtx);
2308
2309         if (len < 24 + 6)
2310                 return RX_MGMT_NONE;
2311
2312         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2313                 return RX_MGMT_NONE;
2314
2315         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2316
2317         if (!ether_addr_equal(bssid, mgmt->bssid))
2318                 return RX_MGMT_NONE;
2319
2320         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2321         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2322         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2323
2324         if (auth_alg != ifmgd->auth_data->algorithm ||
2325             auth_transaction != ifmgd->auth_data->expected_transaction) {
2326                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2327                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2328                            auth_transaction,
2329                            ifmgd->auth_data->expected_transaction);
2330                 return RX_MGMT_NONE;
2331         }
2332
2333         if (status_code != WLAN_STATUS_SUCCESS) {
2334                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2335                            mgmt->sa, status_code);
2336                 ieee80211_destroy_auth_data(sdata, false);
2337                 return RX_MGMT_CFG80211_RX_AUTH;
2338         }
2339
2340         switch (ifmgd->auth_data->algorithm) {
2341         case WLAN_AUTH_OPEN:
2342         case WLAN_AUTH_LEAP:
2343         case WLAN_AUTH_FT:
2344         case WLAN_AUTH_SAE:
2345                 break;
2346         case WLAN_AUTH_SHARED_KEY:
2347                 if (ifmgd->auth_data->expected_transaction != 4) {
2348                         ieee80211_auth_challenge(sdata, mgmt, len);
2349                         /* need another frame */
2350                         return RX_MGMT_NONE;
2351                 }
2352                 break;
2353         default:
2354                 WARN_ONCE(1, "invalid auth alg %d",
2355                           ifmgd->auth_data->algorithm);
2356                 return RX_MGMT_NONE;
2357         }
2358
2359         sdata_info(sdata, "authenticated\n");
2360         ifmgd->auth_data->done = true;
2361         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2362         ifmgd->auth_data->timeout_started = true;
2363         run_again(ifmgd, ifmgd->auth_data->timeout);
2364
2365         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2366             ifmgd->auth_data->expected_transaction != 2) {
2367                 /*
2368                  * Report auth frame to user space for processing since another
2369                  * round of Authentication frames is still needed.
2370                  */
2371                 return RX_MGMT_CFG80211_RX_AUTH;
2372         }
2373
2374         /* move station state to auth */
2375         mutex_lock(&sdata->local->sta_mtx);
2376         sta = sta_info_get(sdata, bssid);
2377         if (!sta) {
2378                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2379                 goto out_err;
2380         }
2381         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2382                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2383                 goto out_err;
2384         }
2385         mutex_unlock(&sdata->local->sta_mtx);
2386
2387         return RX_MGMT_CFG80211_RX_AUTH;
2388  out_err:
2389         mutex_unlock(&sdata->local->sta_mtx);
2390         /* ignore frame -- wait for timeout */
2391         return RX_MGMT_NONE;
2392 }
2393
2394
2395 static enum rx_mgmt_action __must_check
2396 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2397                          struct ieee80211_mgmt *mgmt, size_t len)
2398 {
2399         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2400         const u8 *bssid = NULL;
2401         u16 reason_code;
2402
2403         lockdep_assert_held(&ifmgd->mtx);
2404
2405         if (len < 24 + 2)
2406                 return RX_MGMT_NONE;
2407
2408         if (!ifmgd->associated ||
2409             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2410                 return RX_MGMT_NONE;
2411
2412         bssid = ifmgd->associated->bssid;
2413
2414         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2415
2416         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2417                    bssid, reason_code);
2418
2419         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2420
2421         return RX_MGMT_CFG80211_DEAUTH;
2422 }
2423
2424
2425 static enum rx_mgmt_action __must_check
2426 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2427                            struct ieee80211_mgmt *mgmt, size_t len)
2428 {
2429         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2430         u16 reason_code;
2431
2432         lockdep_assert_held(&ifmgd->mtx);
2433
2434         if (len < 24 + 2)
2435                 return RX_MGMT_NONE;
2436
2437         if (!ifmgd->associated ||
2438             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2439                 return RX_MGMT_NONE;
2440
2441         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2442
2443         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2444                    mgmt->sa, reason_code);
2445
2446         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2447
2448         return RX_MGMT_CFG80211_DISASSOC;
2449 }
2450
2451 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2452                                 u8 *supp_rates, unsigned int supp_rates_len,
2453                                 u32 *rates, u32 *basic_rates,
2454                                 bool *have_higher_than_11mbit,
2455                                 int *min_rate, int *min_rate_index)
2456 {
2457         int i, j;
2458
2459         for (i = 0; i < supp_rates_len; i++) {
2460                 int rate = (supp_rates[i] & 0x7f) * 5;
2461                 bool is_basic = !!(supp_rates[i] & 0x80);
2462
2463                 if (rate > 110)
2464                         *have_higher_than_11mbit = true;
2465
2466                 /*
2467                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2468                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2469                  *
2470                  * Note: Even through the membership selector and the basic
2471                  *       rate flag share the same bit, they are not exactly
2472                  *       the same.
2473                  */
2474                 if (!!(supp_rates[i] & 0x80) &&
2475                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2476                         continue;
2477
2478                 for (j = 0; j < sband->n_bitrates; j++) {
2479                         if (sband->bitrates[j].bitrate == rate) {
2480                                 *rates |= BIT(j);
2481                                 if (is_basic)
2482                                         *basic_rates |= BIT(j);
2483                                 if (rate < *min_rate) {
2484                                         *min_rate = rate;
2485                                         *min_rate_index = j;
2486                                 }
2487                                 break;
2488                         }
2489                 }
2490         }
2491 }
2492
2493 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2494                                          bool assoc)
2495 {
2496         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2497
2498         lockdep_assert_held(&sdata->u.mgd.mtx);
2499
2500         if (!assoc) {
2501                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2502
2503                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2504                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2505                 sdata->u.mgd.flags = 0;
2506                 ieee80211_vif_release_channel(sdata);
2507         }
2508
2509         kfree(assoc_data);
2510         sdata->u.mgd.assoc_data = NULL;
2511 }
2512
2513 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2514                                     struct cfg80211_bss *cbss,
2515                                     struct ieee80211_mgmt *mgmt, size_t len)
2516 {
2517         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2518         struct ieee80211_local *local = sdata->local;
2519         struct ieee80211_supported_band *sband;
2520         struct sta_info *sta;
2521         u8 *pos;
2522         u16 capab_info, aid;
2523         struct ieee802_11_elems elems;
2524         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2525         const struct cfg80211_bss_ies *bss_ies = NULL;
2526         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2527         u32 changed = 0;
2528         int err;
2529         bool ret;
2530
2531         /* AssocResp and ReassocResp have identical structure */
2532
2533         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2534         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2535
2536         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2537                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2538                            aid);
2539         aid &= ~(BIT(15) | BIT(14));
2540
2541         ifmgd->broken_ap = false;
2542
2543         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2544                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2545                            aid);
2546                 aid = 0;
2547                 ifmgd->broken_ap = true;
2548         }
2549
2550         pos = mgmt->u.assoc_resp.variable;
2551         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2552
2553         if (!elems.supp_rates) {
2554                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2555                 return false;
2556         }
2557
2558         ifmgd->aid = aid;
2559
2560         /*
2561          * Some APs are erroneously not including some information in their
2562          * (re)association response frames. Try to recover by using the data
2563          * from the beacon or probe response. This seems to afflict mobile
2564          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2565          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2566          */
2567         if ((assoc_data->wmm && !elems.wmm_param) ||
2568             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2569              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2570             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2571              (!elems.vht_cap_elem || !elems.vht_operation))) {
2572                 const struct cfg80211_bss_ies *ies;
2573                 struct ieee802_11_elems bss_elems;
2574
2575                 rcu_read_lock();
2576                 ies = rcu_dereference(cbss->ies);
2577                 if (ies)
2578                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2579                                           GFP_ATOMIC);
2580                 rcu_read_unlock();
2581                 if (!bss_ies)
2582                         return false;
2583
2584                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2585                                        false, &bss_elems);
2586                 if (assoc_data->wmm &&
2587                     !elems.wmm_param && bss_elems.wmm_param) {
2588                         elems.wmm_param = bss_elems.wmm_param;
2589                         sdata_info(sdata,
2590                                    "AP bug: WMM param missing from AssocResp\n");
2591                 }
2592
2593                 /*
2594                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2595                  * have to include the IEs in the (re)association response.
2596                  */
2597                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2598                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2599                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2600                         sdata_info(sdata,
2601                                    "AP bug: HT capability missing from AssocResp\n");
2602                 }
2603                 if (!elems.ht_operation && bss_elems.ht_operation &&
2604                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2605                         elems.ht_operation = bss_elems.ht_operation;
2606                         sdata_info(sdata,
2607                                    "AP bug: HT operation missing from AssocResp\n");
2608                 }
2609                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2610                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2611                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2612                         sdata_info(sdata,
2613                                    "AP bug: VHT capa missing from AssocResp\n");
2614                 }
2615                 if (!elems.vht_operation && bss_elems.vht_operation &&
2616                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2617                         elems.vht_operation = bss_elems.vht_operation;
2618                         sdata_info(sdata,
2619                                    "AP bug: VHT operation missing from AssocResp\n");
2620                 }
2621         }
2622
2623         /*
2624          * We previously checked these in the beacon/probe response, so
2625          * they should be present here. This is just a safety net.
2626          */
2627         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2628             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2629                 sdata_info(sdata,
2630                            "HT AP is missing WMM params or HT capability/operation\n");
2631                 ret = false;
2632                 goto out;
2633         }
2634
2635         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2636             (!elems.vht_cap_elem || !elems.vht_operation)) {
2637                 sdata_info(sdata,
2638                            "VHT AP is missing VHT capability/operation\n");
2639                 ret = false;
2640                 goto out;
2641         }
2642
2643         mutex_lock(&sdata->local->sta_mtx);
2644         /*
2645          * station info was already allocated and inserted before
2646          * the association and should be available to us
2647          */
2648         sta = sta_info_get(sdata, cbss->bssid);
2649         if (WARN_ON(!sta)) {
2650                 mutex_unlock(&sdata->local->sta_mtx);
2651                 ret = false;
2652                 goto out;
2653         }
2654
2655         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2656
2657         /* Set up internal HT/VHT capabilities */
2658         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2659                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2660                                                   elems.ht_cap_elem, sta);
2661
2662         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2663                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2664                                                     elems.vht_cap_elem, sta);
2665
2666         /*
2667          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2668          * in their association response, so ignore that data for our own
2669          * configuration. If it changed since the last beacon, we'll get the
2670          * next beacon and update then.
2671          */
2672
2673         /*
2674          * If an operating mode notification IE is present, override the
2675          * NSS calculation (that would be done in rate_control_rate_init())
2676          * and use the # of streams from that element.
2677          */
2678         if (elems.opmode_notif &&
2679             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2680                 u8 nss;
2681
2682                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2683                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2684                 nss += 1;
2685                 sta->sta.rx_nss = nss;
2686         }
2687
2688         rate_control_rate_init(sta);
2689
2690         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2691                 set_sta_flag(sta, WLAN_STA_MFP);
2692
2693         if (elems.wmm_param)
2694                 set_sta_flag(sta, WLAN_STA_WME);
2695
2696         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2697         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2698                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2699         if (err) {
2700                 sdata_info(sdata,
2701                            "failed to move station %pM to desired state\n",
2702                            sta->sta.addr);
2703                 WARN_ON(__sta_info_destroy(sta));
2704                 mutex_unlock(&sdata->local->sta_mtx);
2705                 ret = false;
2706                 goto out;
2707         }
2708
2709         mutex_unlock(&sdata->local->sta_mtx);
2710
2711         /*
2712          * Always handle WMM once after association regardless
2713          * of the first value the AP uses. Setting -1 here has
2714          * that effect because the AP values is an unsigned
2715          * 4-bit value.
2716          */
2717         ifmgd->wmm_last_param_set = -1;
2718
2719         if (elems.wmm_param)
2720                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2721                                          elems.wmm_param_len);
2722         else
2723                 ieee80211_set_wmm_default(sdata, false);
2724         changed |= BSS_CHANGED_QOS;
2725
2726         /* set AID and assoc capability,
2727          * ieee80211_set_associated() will tell the driver */
2728         bss_conf->aid = aid;
2729         bss_conf->assoc_capability = capab_info;
2730         ieee80211_set_associated(sdata, cbss, changed);
2731
2732         /*
2733          * If we're using 4-addr mode, let the AP know that we're
2734          * doing so, so that it can create the STA VLAN on its side
2735          */
2736         if (ifmgd->use_4addr)
2737                 ieee80211_send_4addr_nullfunc(local, sdata);
2738
2739         /*
2740          * Start timer to probe the connection to the AP now.
2741          * Also start the timer that will detect beacon loss.
2742          */
2743         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2744         ieee80211_sta_reset_beacon_monitor(sdata);
2745
2746         ret = true;
2747  out:
2748         kfree(bss_ies);
2749         return ret;
2750 }
2751
2752 static enum rx_mgmt_action __must_check
2753 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2754                              struct ieee80211_mgmt *mgmt, size_t len,
2755                              struct cfg80211_bss **bss)
2756 {
2757         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2758         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2759         u16 capab_info, status_code, aid;
2760         struct ieee802_11_elems elems;
2761         u8 *pos;
2762         bool reassoc;
2763
2764         lockdep_assert_held(&ifmgd->mtx);
2765
2766         if (!assoc_data)
2767                 return RX_MGMT_NONE;
2768         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2769                 return RX_MGMT_NONE;
2770
2771         /*
2772          * AssocResp and ReassocResp have identical structure, so process both
2773          * of them in this function.
2774          */
2775
2776         if (len < 24 + 6)
2777                 return RX_MGMT_NONE;
2778
2779         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2780         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2781         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2782         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2783
2784         sdata_info(sdata,
2785                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2786                    reassoc ? "Rea" : "A", mgmt->sa,
2787                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2788
2789         pos = mgmt->u.assoc_resp.variable;
2790         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2791
2792         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2793             elems.timeout_int &&
2794             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2795                 u32 tu, ms;
2796                 tu = le32_to_cpu(elems.timeout_int->value);
2797                 ms = tu * 1024 / 1000;
2798                 sdata_info(sdata,
2799                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2800                            mgmt->sa, tu, ms);
2801                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2802                 assoc_data->timeout_started = true;
2803                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2804                         run_again(ifmgd, assoc_data->timeout);
2805                 return RX_MGMT_NONE;
2806         }
2807
2808         *bss = assoc_data->bss;
2809
2810         if (status_code != WLAN_STATUS_SUCCESS) {
2811                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2812                            mgmt->sa, status_code);
2813                 ieee80211_destroy_assoc_data(sdata, false);
2814         } else {
2815                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2816                         /* oops -- internal error -- send timeout for now */
2817                         ieee80211_destroy_assoc_data(sdata, false);
2818                         cfg80211_put_bss(sdata->local->hw.wiphy, *bss);
2819                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2820                 }
2821                 sdata_info(sdata, "associated\n");
2822
2823                 /*
2824                  * destroy assoc_data afterwards, as otherwise an idle
2825                  * recalc after assoc_data is NULL but before associated
2826                  * is set can cause the interface to go idle
2827                  */
2828                 ieee80211_destroy_assoc_data(sdata, true);
2829         }
2830
2831         return RX_MGMT_CFG80211_RX_ASSOC;
2832 }
2833
2834 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2835                                   struct ieee80211_mgmt *mgmt, size_t len,
2836                                   struct ieee80211_rx_status *rx_status,
2837                                   struct ieee802_11_elems *elems)
2838 {
2839         struct ieee80211_local *local = sdata->local;
2840         int freq;
2841         struct ieee80211_bss *bss;
2842         struct ieee80211_channel *channel;
2843         bool need_ps = false;
2844
2845         lockdep_assert_held(&sdata->u.mgd.mtx);
2846
2847         if ((sdata->u.mgd.associated &&
2848              ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) ||
2849             (sdata->u.mgd.assoc_data &&
2850              ether_addr_equal(mgmt->bssid,
2851                               sdata->u.mgd.assoc_data->bss->bssid))) {
2852                 /* not previously set so we may need to recalc */
2853                 need_ps = sdata->u.mgd.associated && !sdata->u.mgd.dtim_period;
2854
2855                 if (elems->tim && !elems->parse_error) {
2856                         const struct ieee80211_tim_ie *tim_ie = elems->tim;
2857                         sdata->u.mgd.dtim_period = tim_ie->dtim_period;
2858                 }
2859         }
2860
2861         if (elems->ds_params)
2862                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2863                                                       rx_status->band);
2864         else
2865                 freq = rx_status->freq;
2866
2867         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2868
2869         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2870                 return;
2871
2872         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2873                                         channel);
2874         if (bss)
2875                 ieee80211_rx_bss_put(local, bss);
2876
2877         if (!sdata->u.mgd.associated ||
2878             !ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid))
2879                 return;
2880
2881         if (need_ps) {
2882                 mutex_lock(&local->iflist_mtx);
2883                 ieee80211_recalc_ps(local, -1);
2884                 mutex_unlock(&local->iflist_mtx);
2885         }
2886
2887         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
2888                                          elems, true);
2889
2890 }
2891
2892
2893 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2894                                          struct sk_buff *skb)
2895 {
2896         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2897         struct ieee80211_if_managed *ifmgd;
2898         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2899         size_t baselen, len = skb->len;
2900         struct ieee802_11_elems elems;
2901
2902         ifmgd = &sdata->u.mgd;
2903
2904         ASSERT_MGD_MTX(ifmgd);
2905
2906         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2907                 return; /* ignore ProbeResp to foreign address */
2908
2909         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2910         if (baselen > len)
2911                 return;
2912
2913         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2914                                false, &elems);
2915
2916         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2917
2918         if (ifmgd->associated &&
2919             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2920                 ieee80211_reset_ap_probe(sdata);
2921
2922         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2923             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2924                 /* got probe response, continue with auth */
2925                 sdata_info(sdata, "direct probe responded\n");
2926                 ifmgd->auth_data->tries = 0;
2927                 ifmgd->auth_data->timeout = jiffies;
2928                 ifmgd->auth_data->timeout_started = true;
2929                 run_again(ifmgd, ifmgd->auth_data->timeout);
2930         }
2931 }
2932
2933 /*
2934  * This is the canonical list of information elements we care about,
2935  * the filter code also gives us all changes to the Microsoft OUI
2936  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2937  *
2938  * We implement beacon filtering in software since that means we can
2939  * avoid processing the frame here and in cfg80211, and userspace
2940  * will not be able to tell whether the hardware supports it or not.
2941  *
2942  * XXX: This list needs to be dynamic -- userspace needs to be able to
2943  *      add items it requires. It also needs to be able to tell us to
2944  *      look out for other vendor IEs.
2945  */
2946 static const u64 care_about_ies =
2947         (1ULL << WLAN_EID_COUNTRY) |
2948         (1ULL << WLAN_EID_ERP_INFO) |
2949         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2950         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2951         (1ULL << WLAN_EID_HT_CAPABILITY) |
2952         (1ULL << WLAN_EID_HT_OPERATION);
2953
2954 static enum rx_mgmt_action
2955 ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2956                          struct ieee80211_mgmt *mgmt, size_t len,
2957                          u8 *deauth_buf, struct ieee80211_rx_status *rx_status)
2958 {
2959         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2960         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2961         size_t baselen;
2962         struct ieee802_11_elems elems;
2963         struct ieee80211_local *local = sdata->local;
2964         struct ieee80211_chanctx_conf *chanctx_conf;
2965         struct ieee80211_channel *chan;
2966         struct sta_info *sta;
2967         u32 changed = 0;
2968         bool erp_valid;
2969         u8 erp_value = 0;
2970         u32 ncrc;
2971         u8 *bssid;
2972
2973         lockdep_assert_held(&ifmgd->mtx);
2974
2975         /* Process beacon from the current BSS */
2976         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2977         if (baselen > len)
2978                 return RX_MGMT_NONE;
2979
2980         rcu_read_lock();
2981         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2982         if (!chanctx_conf) {
2983                 rcu_read_unlock();
2984                 return RX_MGMT_NONE;
2985         }
2986
2987         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2988                 rcu_read_unlock();
2989                 return RX_MGMT_NONE;
2990         }
2991         chan = chanctx_conf->def.chan;
2992         rcu_read_unlock();
2993
2994         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2995             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2996                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2997                                        len - baselen, false, &elems);
2998
2999                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3000                 ifmgd->assoc_data->have_beacon = true;
3001                 ifmgd->assoc_data->need_beacon = false;
3002                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3003                         sdata->vif.bss_conf.sync_tsf =
3004                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3005                         sdata->vif.bss_conf.sync_device_ts =
3006                                 rx_status->device_timestamp;
3007                         if (elems.tim)
3008                                 sdata->vif.bss_conf.sync_dtim_count =
3009                                         elems.tim->dtim_count;
3010                         else
3011                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3012                 }
3013                 /* continue assoc process */
3014                 ifmgd->assoc_data->timeout = jiffies;
3015                 ifmgd->assoc_data->timeout_started = true;
3016                 run_again(ifmgd, ifmgd->assoc_data->timeout);
3017                 return RX_MGMT_NONE;
3018         }
3019
3020         if (!ifmgd->associated ||
3021             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3022                 return RX_MGMT_NONE;
3023         bssid = ifmgd->associated->bssid;
3024
3025         /* Track average RSSI from the Beacon frames of the current AP */
3026         ifmgd->last_beacon_signal = rx_status->signal;
3027         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3028                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3029                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3030                 ifmgd->last_cqm_event_signal = 0;
3031                 ifmgd->count_beacon_signal = 1;
3032                 ifmgd->last_ave_beacon_signal = 0;
3033         } else {
3034                 ifmgd->ave_beacon_signal =
3035                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3036                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3037                          ifmgd->ave_beacon_signal) / 16;
3038                 ifmgd->count_beacon_signal++;
3039         }
3040
3041         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3042             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3043                 int sig = ifmgd->ave_beacon_signal;
3044                 int last_sig = ifmgd->last_ave_beacon_signal;
3045
3046                 /*
3047                  * if signal crosses either of the boundaries, invoke callback
3048                  * with appropriate parameters
3049                  */
3050                 if (sig > ifmgd->rssi_max_thold &&
3051                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3052                         ifmgd->last_ave_beacon_signal = sig;
3053                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3054                 } else if (sig < ifmgd->rssi_min_thold &&
3055                            (last_sig >= ifmgd->rssi_max_thold ||
3056                            last_sig == 0)) {
3057                         ifmgd->last_ave_beacon_signal = sig;
3058                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3059                 }
3060         }
3061
3062         if (bss_conf->cqm_rssi_thold &&
3063             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3064             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3065                 int sig = ifmgd->ave_beacon_signal / 16;
3066                 int last_event = ifmgd->last_cqm_event_signal;
3067                 int thold = bss_conf->cqm_rssi_thold;
3068                 int hyst = bss_conf->cqm_rssi_hyst;
3069                 if (sig < thold &&
3070                     (last_event == 0 || sig < last_event - hyst)) {
3071                         ifmgd->last_cqm_event_signal = sig;
3072                         ieee80211_cqm_rssi_notify(
3073                                 &sdata->vif,
3074                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3075                                 GFP_KERNEL);
3076                 } else if (sig > thold &&
3077                            (last_event == 0 || sig > last_event + hyst)) {
3078                         ifmgd->last_cqm_event_signal = sig;
3079                         ieee80211_cqm_rssi_notify(
3080                                 &sdata->vif,
3081                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3082                                 GFP_KERNEL);
3083                 }
3084         }
3085
3086         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
3087                 mlme_dbg_ratelimited(sdata,
3088                                      "cancelling AP probe due to a received beacon\n");
3089                 mutex_lock(&local->mtx);
3090                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
3091                 ieee80211_run_deferred_scan(local);
3092                 mutex_unlock(&local->mtx);
3093
3094                 mutex_lock(&local->iflist_mtx);
3095                 ieee80211_recalc_ps(local, -1);
3096                 mutex_unlock(&local->iflist_mtx);
3097         }
3098
3099         /*
3100          * Push the beacon loss detection into the future since
3101          * we are processing a beacon from the AP just now.
3102          */
3103         ieee80211_sta_reset_beacon_monitor(sdata);
3104
3105         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3106         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3107                                           len - baselen, false, &elems,
3108                                           care_about_ies, ncrc);
3109
3110         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3111                 bool directed_tim = ieee80211_check_tim(elems.tim,
3112                                                         elems.tim_len,
3113                                                         ifmgd->aid);
3114                 if (directed_tim) {
3115                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3116                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3117                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3118                                         ieee80211_hw_config(local,
3119                                                             IEEE80211_CONF_CHANGE_PS);
3120                                 }
3121                                 ieee80211_send_nullfunc(local, sdata, 0);
3122                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3123                                 local->pspolling = true;
3124
3125                                 /*
3126                                  * Here is assumed that the driver will be
3127                                  * able to send ps-poll frame and receive a
3128                                  * response even though power save mode is
3129                                  * enabled, but some drivers might require
3130                                  * to disable power save here. This needs
3131                                  * to be investigated.
3132                                  */
3133                                 ieee80211_send_pspoll(local, sdata);
3134                         }
3135                 }
3136         }
3137
3138         if (sdata->vif.p2p) {
3139                 struct ieee80211_p2p_noa_attr noa = {};
3140                 int ret;
3141
3142                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3143                                             len - baselen,
3144                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3145                                             (u8 *) &noa, sizeof(noa));
3146                 if (ret >= 2) {
3147                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3148                                 /* valid noa_attr and index changed */
3149                                 sdata->u.mgd.p2p_noa_index = noa.index;
3150                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3151                                 changed |= BSS_CHANGED_P2P_PS;
3152                                 /*
3153                                  * make sure we update all information, the CRC
3154                                  * mechanism doesn't look at P2P attributes.
3155                                  */
3156                                 ifmgd->beacon_crc_valid = false;
3157                         }
3158                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3159                         /* noa_attr not found and we had valid noa_attr before */
3160                         sdata->u.mgd.p2p_noa_index = -1;
3161                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3162                         changed |= BSS_CHANGED_P2P_PS;
3163                         ifmgd->beacon_crc_valid = false;
3164                 }
3165         }
3166
3167         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3168                 return RX_MGMT_NONE;
3169         ifmgd->beacon_crc = ncrc;
3170         ifmgd->beacon_crc_valid = true;
3171
3172         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3173
3174         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3175                                      elems.wmm_param_len))
3176                 changed |= BSS_CHANGED_QOS;
3177
3178         /*
3179          * If we haven't had a beacon before, tell the driver about the
3180          * DTIM period (and beacon timing if desired) now.
3181          */
3182         if (!bss_conf->dtim_period) {
3183                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3184                 if (elems.tim)
3185                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3186                 else
3187                         bss_conf->dtim_period = 1;
3188
3189                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3190                         sdata->vif.bss_conf.sync_tsf =
3191                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3192                         sdata->vif.bss_conf.sync_device_ts =
3193                                 rx_status->device_timestamp;
3194                         if (elems.tim)
3195                                 sdata->vif.bss_conf.sync_dtim_count =
3196                                         elems.tim->dtim_count;
3197                         else
3198                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3199                 }
3200
3201                 changed |= BSS_CHANGED_DTIM_PERIOD;
3202         }
3203
3204         if (elems.erp_info) {
3205                 erp_valid = true;
3206                 erp_value = elems.erp_info[0];
3207         } else {
3208                 erp_valid = false;
3209         }
3210         changed |= ieee80211_handle_bss_capability(sdata,
3211                         le16_to_cpu(mgmt->u.beacon.capab_info),
3212                         erp_valid, erp_value);
3213
3214         mutex_lock(&local->sta_mtx);
3215         sta = sta_info_get(sdata, bssid);
3216
3217         if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3218                                 elems.vht_operation, bssid, &changed)) {
3219                 mutex_unlock(&local->sta_mtx);
3220                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3221                                        WLAN_REASON_DEAUTH_LEAVING,
3222                                        true, deauth_buf);
3223                 return RX_MGMT_CFG80211_TX_DEAUTH;
3224         }
3225
3226         if (sta && elems.opmode_notif)
3227                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3228                                             rx_status->band, true);
3229         mutex_unlock(&local->sta_mtx);
3230
3231         if (elems.country_elem && elems.pwr_constr_elem &&
3232             mgmt->u.probe_resp.capab_info &
3233                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3234                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3235                                                        elems.country_elem,
3236                                                        elems.country_elem_len,
3237                                                        elems.pwr_constr_elem);
3238
3239         ieee80211_bss_info_change_notify(sdata, changed);
3240
3241         return RX_MGMT_NONE;
3242 }
3243
3244 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3245                                   struct sk_buff *skb)
3246 {
3247         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3248         struct ieee80211_rx_status *rx_status;
3249         struct ieee80211_mgmt *mgmt;
3250         struct cfg80211_bss *bss = NULL;
3251         enum rx_mgmt_action rma = RX_MGMT_NONE;
3252         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3253         u16 fc;
3254         struct ieee802_11_elems elems;
3255         int ies_len;
3256
3257         rx_status = (struct ieee80211_rx_status *) skb->cb;
3258         mgmt = (struct ieee80211_mgmt *) skb->data;
3259         fc = le16_to_cpu(mgmt->frame_control);
3260
3261         mutex_lock(&ifmgd->mtx);
3262
3263         switch (fc & IEEE80211_FCTL_STYPE) {
3264         case IEEE80211_STYPE_BEACON:
3265                 rma = ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
3266                                                deauth_buf, rx_status);
3267                 break;
3268         case IEEE80211_STYPE_PROBE_RESP:
3269                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3270                 break;
3271         case IEEE80211_STYPE_AUTH:
3272                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3273                 break;
3274         case IEEE80211_STYPE_DEAUTH:
3275                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3276                 break;
3277         case IEEE80211_STYPE_DISASSOC:
3278                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3279                 break;
3280         case IEEE80211_STYPE_ASSOC_RESP:
3281         case IEEE80211_STYPE_REASSOC_RESP:
3282                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
3283                 break;
3284         case IEEE80211_STYPE_ACTION:
3285                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3286                         ies_len = skb->len -
3287                                   offsetof(struct ieee80211_mgmt,
3288                                            u.action.u.chan_switch.variable);
3289
3290                         if (ies_len < 0)
3291                                 break;
3292
3293                         ieee802_11_parse_elems(
3294                                 mgmt->u.action.u.chan_switch.variable,
3295                                 ies_len, true, &elems);
3296
3297                         if (elems.parse_error)
3298                                 break;
3299
3300                         ieee80211_sta_process_chanswitch(sdata,
3301                                                          rx_status->mactime,
3302                                                          &elems, false);
3303                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3304                         ies_len = skb->len -
3305                                   offsetof(struct ieee80211_mgmt,
3306                                            u.action.u.ext_chan_switch.variable);
3307
3308                         if (ies_len < 0)
3309                                 break;
3310
3311                         ieee802_11_parse_elems(
3312                                 mgmt->u.action.u.ext_chan_switch.variable,
3313                                 ies_len, true, &elems);
3314
3315                         if (elems.parse_error)
3316                                 break;
3317
3318                         /* for the handling code pretend this was also an IE */
3319                         elems.ext_chansw_ie =
3320                                 &mgmt->u.action.u.ext_chan_switch.data;
3321
3322                         ieee80211_sta_process_chanswitch(sdata,
3323                                                          rx_status->mactime,
3324                                                          &elems, false);
3325                 }
3326                 break;
3327         }
3328         mutex_unlock(&ifmgd->mtx);
3329
3330         switch (rma) {
3331         case RX_MGMT_NONE:
3332                 /* no action */
3333                 break;
3334         case RX_MGMT_CFG80211_DEAUTH:
3335                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
3336                 break;
3337         case RX_MGMT_CFG80211_DISASSOC:
3338                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
3339                 break;
3340         case RX_MGMT_CFG80211_RX_AUTH:
3341                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
3342                 break;
3343         case RX_MGMT_CFG80211_RX_ASSOC:
3344                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
3345                 break;
3346         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
3347                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
3348                 break;
3349         case RX_MGMT_CFG80211_TX_DEAUTH:
3350                 cfg80211_send_deauth(sdata->dev, deauth_buf,
3351                                      sizeof(deauth_buf));
3352                 break;
3353         default:
3354                 WARN(1, "unexpected: %d", rma);
3355         }
3356 }
3357
3358 static void ieee80211_sta_timer(unsigned long data)
3359 {
3360         struct ieee80211_sub_if_data *sdata =
3361                 (struct ieee80211_sub_if_data *) data;
3362
3363         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3364 }
3365
3366 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3367                                           u8 *bssid, u8 reason, bool tx)
3368 {
3369         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3370         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3371
3372         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3373                                tx, frame_buf);
3374         mutex_unlock(&ifmgd->mtx);
3375
3376         /*
3377          * must be outside lock due to cfg80211,
3378          * but that's not a problem.
3379          */
3380         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
3381
3382         mutex_lock(&ifmgd->mtx);
3383 }
3384
3385 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3386 {
3387         struct ieee80211_local *local = sdata->local;
3388         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3389         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3390         u32 tx_flags = 0;
3391
3392         lockdep_assert_held(&ifmgd->mtx);
3393
3394         if (WARN_ON_ONCE(!auth_data))
3395                 return -EINVAL;
3396
3397         auth_data->tries++;
3398
3399         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3400                 sdata_info(sdata, "authentication with %pM timed out\n",
3401                            auth_data->bss->bssid);
3402
3403                 /*
3404                  * Most likely AP is not in the range so remove the
3405                  * bss struct for that AP.
3406                  */
3407                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3408
3409                 return -ETIMEDOUT;
3410         }
3411
3412         drv_mgd_prepare_tx(local, sdata);
3413
3414         if (auth_data->bss->proberesp_ies) {
3415                 u16 trans = 1;
3416                 u16 status = 0;
3417
3418                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3419                            auth_data->bss->bssid, auth_data->tries,
3420                            IEEE80211_AUTH_MAX_TRIES);
3421
3422                 auth_data->expected_transaction = 2;
3423
3424                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3425                         trans = auth_data->sae_trans;
3426                         status = auth_data->sae_status;
3427                         auth_data->expected_transaction = trans;
3428                 }
3429
3430                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3431                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3432                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3433
3434                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3435                                     auth_data->data, auth_data->data_len,
3436                                     auth_data->bss->bssid,
3437                                     auth_data->bss->bssid, NULL, 0, 0,
3438                                     tx_flags);
3439         } else {
3440                 const u8 *ssidie;
3441
3442                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3443                            auth_data->bss->bssid, auth_data->tries,
3444                            IEEE80211_AUTH_MAX_TRIES);
3445
3446                 rcu_read_lock();
3447                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3448                 if (!ssidie) {
3449                         rcu_read_unlock();
3450                         return -EINVAL;
3451                 }
3452                 /*
3453                  * Direct probe is sent to broadcast address as some APs
3454                  * will not answer to direct packet in unassociated state.
3455                  */
3456                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3457                                          NULL, 0, (u32) -1, true, 0,
3458                                          auth_data->bss->channel, false);
3459                 rcu_read_unlock();
3460         }
3461
3462         if (tx_flags == 0) {
3463                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3464                 ifmgd->auth_data->timeout_started = true;
3465                 run_again(ifmgd, auth_data->timeout);
3466         } else {
3467                 auth_data->timeout_started = false;
3468         }
3469
3470         return 0;
3471 }
3472
3473 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3474 {
3475         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3476         struct ieee80211_local *local = sdata->local;
3477
3478         lockdep_assert_held(&sdata->u.mgd.mtx);
3479
3480         assoc_data->tries++;
3481         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3482                 sdata_info(sdata, "association with %pM timed out\n",
3483                            assoc_data->bss->bssid);
3484
3485                 /*
3486                  * Most likely AP is not in the range so remove the
3487                  * bss struct for that AP.
3488                  */
3489                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3490
3491                 return -ETIMEDOUT;
3492         }
3493
3494         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3495                    assoc_data->bss->bssid, assoc_data->tries,
3496                    IEEE80211_ASSOC_MAX_TRIES);
3497         ieee80211_send_assoc(sdata);
3498
3499         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3500                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3501                 assoc_data->timeout_started = true;
3502                 run_again(&sdata->u.mgd, assoc_data->timeout);
3503         } else {
3504                 assoc_data->timeout_started = false;
3505         }
3506
3507         return 0;
3508 }
3509
3510 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3511                                   __le16 fc, bool acked)
3512 {
3513         struct ieee80211_local *local = sdata->local;
3514
3515         sdata->u.mgd.status_fc = fc;
3516         sdata->u.mgd.status_acked = acked;
3517         sdata->u.mgd.status_received = true;
3518
3519         ieee80211_queue_work(&local->hw, &sdata->work);
3520 }
3521
3522 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3523 {
3524         struct ieee80211_local *local = sdata->local;
3525         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3526
3527         mutex_lock(&ifmgd->mtx);
3528
3529         if (ifmgd->status_received) {
3530                 __le16 fc = ifmgd->status_fc;
3531                 bool status_acked = ifmgd->status_acked;
3532
3533                 ifmgd->status_received = false;
3534                 if (ifmgd->auth_data &&
3535                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3536                         if (status_acked) {
3537                                 ifmgd->auth_data->timeout =
3538                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3539                                 run_again(ifmgd, ifmgd->auth_data->timeout);
3540                         } else {
3541                                 ifmgd->auth_data->timeout = jiffies - 1;
3542                         }
3543                         ifmgd->auth_data->timeout_started = true;
3544                 } else if (ifmgd->assoc_data &&
3545                            (ieee80211_is_assoc_req(fc) ||
3546                             ieee80211_is_reassoc_req(fc))) {
3547                         if (status_acked) {
3548                                 ifmgd->assoc_data->timeout =
3549                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3550                                 run_again(ifmgd, ifmgd->assoc_data->timeout);
3551                         } else {
3552                                 ifmgd->assoc_data->timeout = jiffies - 1;
3553                         }
3554                         ifmgd->assoc_data->timeout_started = true;
3555                 }
3556         }
3557
3558         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3559             time_after(jiffies, ifmgd->auth_data->timeout)) {
3560                 if (ifmgd->auth_data->done) {
3561                         /*
3562                          * ok ... we waited for assoc but userspace didn't,
3563                          * so let's just kill the auth data
3564                          */
3565                         ieee80211_destroy_auth_data(sdata, false);
3566                 } else if (ieee80211_probe_auth(sdata)) {
3567                         u8 bssid[ETH_ALEN];
3568
3569                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3570
3571                         ieee80211_destroy_auth_data(sdata, false);
3572
3573                         mutex_unlock(&ifmgd->mtx);
3574                         cfg80211_send_auth_timeout(sdata->dev, bssid);
3575                         mutex_lock(&ifmgd->mtx);
3576                 }
3577         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3578                 run_again(ifmgd, ifmgd->auth_data->timeout);
3579
3580         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3581             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3582                 if ((ifmgd->assoc_data->need_beacon &&
3583                      !ifmgd->assoc_data->have_beacon) ||
3584                     ieee80211_do_assoc(sdata)) {
3585                         u8 bssid[ETH_ALEN];
3586
3587                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
3588
3589                         ieee80211_destroy_assoc_data(sdata, false);
3590
3591                         mutex_unlock(&ifmgd->mtx);
3592                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
3593                         mutex_lock(&ifmgd->mtx);
3594                 }
3595         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3596                 run_again(ifmgd, ifmgd->assoc_data->timeout);
3597
3598         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
3599                             IEEE80211_STA_CONNECTION_POLL) &&
3600             ifmgd->associated) {
3601                 u8 bssid[ETH_ALEN];
3602                 int max_tries;
3603
3604                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3605
3606                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3607                         max_tries = max_nullfunc_tries;
3608                 else
3609                         max_tries = max_probe_tries;
3610
3611                 /* ACK received for nullfunc probing frame */
3612                 if (!ifmgd->probe_send_count)
3613                         ieee80211_reset_ap_probe(sdata);
3614                 else if (ifmgd->nullfunc_failed) {
3615                         if (ifmgd->probe_send_count < max_tries) {
3616                                 mlme_dbg(sdata,
3617                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3618                                          bssid, ifmgd->probe_send_count,
3619                                          max_tries);
3620                                 ieee80211_mgd_probe_ap_send(sdata);
3621                         } else {
3622                                 mlme_dbg(sdata,
3623                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3624                                          bssid);
3625                                 ieee80211_sta_connection_lost(sdata, bssid,
3626                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3627                                         false);
3628                         }
3629                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3630                         run_again(ifmgd, ifmgd->probe_timeout);
3631                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3632                         mlme_dbg(sdata,
3633                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3634                                  bssid, probe_wait_ms);
3635                         ieee80211_sta_connection_lost(sdata, bssid,
3636                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3637                 } else if (ifmgd->probe_send_count < max_tries) {
3638                         mlme_dbg(sdata,
3639                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3640                                  bssid, probe_wait_ms,
3641                                  ifmgd->probe_send_count, max_tries);
3642                         ieee80211_mgd_probe_ap_send(sdata);
3643                 } else {
3644                         /*
3645                          * We actually lost the connection ... or did we?
3646                          * Let's make sure!
3647                          */
3648                         wiphy_debug(local->hw.wiphy,
3649                                     "%s: No probe response from AP %pM"
3650                                     " after %dms, disconnecting.\n",
3651                                     sdata->name,
3652                                     bssid, probe_wait_ms);
3653
3654                         ieee80211_sta_connection_lost(sdata, bssid,
3655                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3656                 }
3657         }
3658
3659         mutex_unlock(&ifmgd->mtx);
3660 }
3661
3662 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3663 {
3664         struct ieee80211_sub_if_data *sdata =
3665                 (struct ieee80211_sub_if_data *) data;
3666         struct ieee80211_local *local = sdata->local;
3667
3668         if (local->quiescing)
3669                 return;
3670
3671         sdata->u.mgd.connection_loss = false;
3672         ieee80211_queue_work(&sdata->local->hw,
3673                              &sdata->u.mgd.beacon_connection_loss_work);
3674 }
3675
3676 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3677 {
3678         struct ieee80211_sub_if_data *sdata =
3679                 (struct ieee80211_sub_if_data *) data;
3680         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3681         struct ieee80211_local *local = sdata->local;
3682
3683         if (local->quiescing)
3684                 return;
3685
3686         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3687 }
3688
3689 static void ieee80211_sta_monitor_work(struct work_struct *work)
3690 {
3691         struct ieee80211_sub_if_data *sdata =
3692                 container_of(work, struct ieee80211_sub_if_data,
3693                              u.mgd.monitor_work);
3694
3695         ieee80211_mgd_probe_ap(sdata, false);
3696 }
3697
3698 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3699 {
3700         u32 flags;
3701
3702         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3703                 __ieee80211_stop_poll(sdata);
3704
3705                 /* let's probe the connection once */
3706                 flags = sdata->local->hw.flags;
3707                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3708                         ieee80211_queue_work(&sdata->local->hw,
3709                                              &sdata->u.mgd.monitor_work);
3710                 /* and do all the other regular work too */
3711                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3712         }
3713 }
3714
3715 #ifdef CONFIG_PM
3716 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3717 {
3718         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3719
3720         mutex_lock(&ifmgd->mtx);
3721         if (!ifmgd->associated) {
3722                 mutex_unlock(&ifmgd->mtx);
3723                 return;
3724         }
3725
3726         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3727                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3728                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3729                 ieee80211_sta_connection_lost(sdata,
3730                                               ifmgd->associated->bssid,
3731                                               WLAN_REASON_UNSPECIFIED,
3732                                               true);
3733                 mutex_unlock(&ifmgd->mtx);
3734                 return;
3735         }
3736         mutex_unlock(&ifmgd->mtx);
3737 }
3738 #endif
3739
3740 /* interface setup */
3741 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3742 {
3743         struct ieee80211_if_managed *ifmgd;
3744
3745         ifmgd = &sdata->u.mgd;
3746         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3747         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3748         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3749                   ieee80211_beacon_connection_loss_work);
3750         INIT_WORK(&ifmgd->csa_connection_drop_work,
3751                   ieee80211_csa_connection_drop_work);
3752         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3753         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3754                     (unsigned long) sdata);
3755         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3756                     (unsigned long) sdata);
3757         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3758                     (unsigned long) sdata);
3759         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3760                     (unsigned long) sdata);
3761
3762         ifmgd->flags = 0;
3763         ifmgd->powersave = sdata->wdev.ps;
3764         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3765         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3766         ifmgd->p2p_noa_index = -1;
3767
3768         mutex_init(&ifmgd->mtx);
3769
3770         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3771                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3772         else
3773                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3774 }
3775
3776 /* scan finished notification */
3777 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3778 {
3779         struct ieee80211_sub_if_data *sdata;
3780
3781         /* Restart STA timers */
3782         rcu_read_lock();
3783         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3784                 if (ieee80211_sdata_running(sdata))
3785                         ieee80211_restart_sta_timer(sdata);
3786         }
3787         rcu_read_unlock();
3788 }
3789
3790 int ieee80211_max_network_latency(struct notifier_block *nb,
3791                                   unsigned long data, void *dummy)
3792 {
3793         s32 latency_usec = (s32) data;
3794         struct ieee80211_local *local =
3795                 container_of(nb, struct ieee80211_local,
3796                              network_latency_notifier);
3797
3798         mutex_lock(&local->iflist_mtx);
3799         ieee80211_recalc_ps(local, latency_usec);
3800         mutex_unlock(&local->iflist_mtx);
3801
3802         return 0;
3803 }
3804
3805 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3806                                      struct cfg80211_bss *cbss)
3807 {
3808         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3809         const u8 *ht_cap_ie, *vht_cap_ie;
3810         const struct ieee80211_ht_cap *ht_cap;
3811         const struct ieee80211_vht_cap *vht_cap;
3812         u8 chains = 1;
3813
3814         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3815                 return chains;
3816
3817         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3818         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3819                 ht_cap = (void *)(ht_cap_ie + 2);
3820                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3821                 /*
3822                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3823                  *       "Tx Unequal Modulation Supported" fields.
3824                  */
3825         }
3826
3827         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3828                 return chains;
3829
3830         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3831         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3832                 u8 nss;
3833                 u16 tx_mcs_map;
3834
3835                 vht_cap = (void *)(vht_cap_ie + 2);
3836                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3837                 for (nss = 8; nss > 0; nss--) {
3838                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3839                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3840                                 break;
3841                 }
3842                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3843                 chains = max(chains, nss);
3844         }
3845
3846         return chains;
3847 }
3848
3849 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3850                                   struct cfg80211_bss *cbss)
3851 {
3852         struct ieee80211_local *local = sdata->local;
3853         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3854         const struct ieee80211_ht_operation *ht_oper = NULL;
3855         const struct ieee80211_vht_operation *vht_oper = NULL;
3856         struct ieee80211_supported_band *sband;
3857         struct cfg80211_chan_def chandef;
3858         int ret;
3859
3860         sband = local->hw.wiphy->bands[cbss->channel->band];
3861
3862         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3863                           IEEE80211_STA_DISABLE_80P80MHZ |
3864                           IEEE80211_STA_DISABLE_160MHZ);
3865
3866         rcu_read_lock();
3867
3868         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3869             sband->ht_cap.ht_supported) {
3870                 const u8 *ht_oper_ie, *ht_cap;
3871
3872                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3873                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3874                         ht_oper = (void *)(ht_oper_ie + 2);
3875
3876                 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3877                 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3878                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3879                         ht_oper = NULL;
3880                 }
3881         }
3882
3883         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3884             sband->vht_cap.vht_supported) {
3885                 const u8 *vht_oper_ie, *vht_cap;
3886
3887                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3888                                                    WLAN_EID_VHT_OPERATION);
3889                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3890                         vht_oper = (void *)(vht_oper_ie + 2);
3891                 if (vht_oper && !ht_oper) {
3892                         vht_oper = NULL;
3893                         sdata_info(sdata,
3894                                    "AP advertised VHT without HT, disabling both\n");
3895                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3896                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3897                 }
3898
3899                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3900                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3901                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3902                         vht_oper = NULL;
3903                 }
3904         }
3905
3906         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3907                                                      cbss->channel,
3908                                                      ht_oper, vht_oper,
3909                                                      &chandef, true);
3910
3911         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3912                                       local->rx_chains);
3913
3914         rcu_read_unlock();
3915
3916         /* will change later if needed */
3917         sdata->smps_mode = IEEE80211_SMPS_OFF;
3918
3919         /*
3920          * If this fails (possibly due to channel context sharing
3921          * on incompatible channels, e.g. 80+80 and 160 sharing the
3922          * same control channel) try to use a smaller bandwidth.
3923          */
3924         ret = ieee80211_vif_use_channel(sdata, &chandef,
3925                                         IEEE80211_CHANCTX_SHARED);
3926         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3927                 ifmgd->flags |= chandef_downgrade(&chandef);
3928                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3929                                                 IEEE80211_CHANCTX_SHARED);
3930         }
3931         return ret;
3932 }
3933
3934 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3935                                      struct cfg80211_bss *cbss, bool assoc)
3936 {
3937         struct ieee80211_local *local = sdata->local;
3938         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3939         struct ieee80211_bss *bss = (void *)cbss->priv;
3940         struct sta_info *new_sta = NULL;
3941         bool have_sta = false;
3942         int err;
3943
3944         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3945                 return -EINVAL;
3946
3947         if (assoc) {
3948                 rcu_read_lock();
3949                 have_sta = sta_info_get(sdata, cbss->bssid);
3950                 rcu_read_unlock();
3951         }
3952
3953         if (!have_sta) {
3954                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3955                 if (!new_sta)
3956                         return -ENOMEM;
3957         }
3958
3959         if (new_sta) {
3960                 u32 rates = 0, basic_rates = 0;
3961                 bool have_higher_than_11mbit;
3962                 int min_rate = INT_MAX, min_rate_index = -1;
3963                 struct ieee80211_supported_band *sband;
3964                 const struct cfg80211_bss_ies *ies;
3965
3966                 sband = local->hw.wiphy->bands[cbss->channel->band];
3967
3968                 err = ieee80211_prep_channel(sdata, cbss);
3969                 if (err) {
3970                         sta_info_free(local, new_sta);
3971                         return err;
3972                 }
3973
3974                 ieee80211_get_rates(sband, bss->supp_rates,
3975                                     bss->supp_rates_len,
3976                                     &rates, &basic_rates,
3977                                     &have_higher_than_11mbit,
3978                                     &min_rate, &min_rate_index);
3979
3980                 /*
3981                  * This used to be a workaround for basic rates missing
3982                  * in the association response frame. Now that we no
3983                  * longer use the basic rates from there, it probably
3984                  * doesn't happen any more, but keep the workaround so
3985                  * in case some *other* APs are buggy in different ways
3986                  * we can connect -- with a warning.
3987                  */
3988                 if (!basic_rates && min_rate_index >= 0) {
3989                         sdata_info(sdata,
3990                                    "No basic rates, using min rate instead\n");
3991                         basic_rates = BIT(min_rate_index);
3992                 }
3993
3994                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3995                 sdata->vif.bss_conf.basic_rates = basic_rates;
3996
3997                 /* cf. IEEE 802.11 9.2.12 */
3998                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3999                     have_higher_than_11mbit)
4000                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4001                 else
4002                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4003
4004                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4005
4006                 /* set timing information */
4007                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4008                 rcu_read_lock();
4009                 ies = rcu_dereference(cbss->beacon_ies);
4010                 if (ies) {
4011                         const u8 *tim_ie;
4012
4013                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4014                         sdata->vif.bss_conf.sync_device_ts =
4015                                 bss->device_ts_beacon;
4016                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4017                                                   ies->data, ies->len);
4018                         if (tim_ie && tim_ie[1] >= 2)
4019                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4020                         else
4021                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4022                 } else if (!(local->hw.flags &
4023                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4024                         ies = rcu_dereference(cbss->proberesp_ies);
4025                         /* must be non-NULL since beacon IEs were NULL */
4026                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4027                         sdata->vif.bss_conf.sync_device_ts =
4028                                 bss->device_ts_presp;
4029                         sdata->vif.bss_conf.sync_dtim_count = 0;
4030                 } else {
4031                         sdata->vif.bss_conf.sync_tsf = 0;
4032                         sdata->vif.bss_conf.sync_device_ts = 0;
4033                         sdata->vif.bss_conf.sync_dtim_count = 0;
4034                 }
4035                 rcu_read_unlock();
4036
4037                 /* tell driver about BSSID, basic rates and timing */
4038                 ieee80211_bss_info_change_notify(sdata,
4039                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4040                         BSS_CHANGED_BEACON_INT);
4041
4042                 if (assoc)
4043                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4044
4045                 err = sta_info_insert(new_sta);
4046                 new_sta = NULL;
4047                 if (err) {
4048                         sdata_info(sdata,
4049                                    "failed to insert STA entry for the AP (error %d)\n",
4050                                    err);
4051                         return err;
4052                 }
4053         } else
4054                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4055
4056         return 0;
4057 }
4058
4059 /* config hooks */
4060 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4061                        struct cfg80211_auth_request *req)
4062 {
4063         struct ieee80211_local *local = sdata->local;
4064         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4065         struct ieee80211_mgd_auth_data *auth_data;
4066         u16 auth_alg;
4067         int err;
4068
4069         /* prepare auth data structure */
4070
4071         switch (req->auth_type) {
4072         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4073                 auth_alg = WLAN_AUTH_OPEN;
4074                 break;
4075         case NL80211_AUTHTYPE_SHARED_KEY:
4076                 if (IS_ERR(local->wep_tx_tfm))
4077                         return -EOPNOTSUPP;
4078                 auth_alg = WLAN_AUTH_SHARED_KEY;
4079                 break;
4080         case NL80211_AUTHTYPE_FT:
4081                 auth_alg = WLAN_AUTH_FT;
4082                 break;
4083         case NL80211_AUTHTYPE_NETWORK_EAP:
4084                 auth_alg = WLAN_AUTH_LEAP;
4085                 break;
4086         case NL80211_AUTHTYPE_SAE:
4087                 auth_alg = WLAN_AUTH_SAE;
4088                 break;
4089         default:
4090                 return -EOPNOTSUPP;
4091         }
4092
4093         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4094                             req->ie_len, GFP_KERNEL);
4095         if (!auth_data)
4096                 return -ENOMEM;
4097
4098         auth_data->bss = req->bss;
4099
4100         if (req->sae_data_len >= 4) {
4101                 __le16 *pos = (__le16 *) req->sae_data;
4102                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4103                 auth_data->sae_status = le16_to_cpu(pos[1]);
4104                 memcpy(auth_data->data, req->sae_data + 4,
4105                        req->sae_data_len - 4);
4106                 auth_data->data_len += req->sae_data_len - 4;
4107         }
4108
4109         if (req->ie && req->ie_len) {
4110                 memcpy(&auth_data->data[auth_data->data_len],
4111                        req->ie, req->ie_len);
4112                 auth_data->data_len += req->ie_len;
4113         }
4114
4115         if (req->key && req->key_len) {
4116                 auth_data->key_len = req->key_len;
4117                 auth_data->key_idx = req->key_idx;
4118                 memcpy(auth_data->key, req->key, req->key_len);
4119         }
4120
4121         auth_data->algorithm = auth_alg;
4122
4123         /* try to authenticate/probe */
4124
4125         mutex_lock(&ifmgd->mtx);
4126
4127         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4128             ifmgd->assoc_data) {
4129                 err = -EBUSY;
4130                 goto err_free;
4131         }
4132
4133         if (ifmgd->auth_data)
4134                 ieee80211_destroy_auth_data(sdata, false);
4135
4136         /* prep auth_data so we don't go into idle on disassoc */
4137         ifmgd->auth_data = auth_data;
4138
4139         if (ifmgd->associated) {
4140                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4141
4142                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4143                                        WLAN_REASON_UNSPECIFIED,
4144                                        false, frame_buf);
4145
4146                 __cfg80211_send_deauth(sdata->dev, frame_buf,
4147                                        sizeof(frame_buf));
4148         }
4149
4150         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4151
4152         err = ieee80211_prep_connection(sdata, req->bss, false);
4153         if (err)
4154                 goto err_clear;
4155
4156         err = ieee80211_probe_auth(sdata);
4157         if (err) {
4158                 sta_info_destroy_addr(sdata, req->bss->bssid);
4159                 goto err_clear;
4160         }
4161
4162         /* hold our own reference */
4163         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4164         err = 0;
4165         goto out_unlock;
4166
4167  err_clear:
4168         memset(ifmgd->bssid, 0, ETH_ALEN);
4169         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4170         ifmgd->auth_data = NULL;
4171  err_free:
4172         kfree(auth_data);
4173  out_unlock:
4174         mutex_unlock(&ifmgd->mtx);
4175
4176         return err;
4177 }
4178
4179 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4180                         struct cfg80211_assoc_request *req)
4181 {
4182         struct ieee80211_local *local = sdata->local;
4183         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4184         struct ieee80211_bss *bss = (void *)req->bss->priv;
4185         struct ieee80211_mgd_assoc_data *assoc_data;
4186         const struct cfg80211_bss_ies *beacon_ies;
4187         struct ieee80211_supported_band *sband;
4188         const u8 *ssidie, *ht_ie, *vht_ie;
4189         int i, err;
4190
4191         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4192         if (!assoc_data)
4193                 return -ENOMEM;
4194
4195         rcu_read_lock();
4196         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4197         if (!ssidie) {
4198                 rcu_read_unlock();
4199                 kfree(assoc_data);
4200                 return -EINVAL;
4201         }
4202         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4203         assoc_data->ssid_len = ssidie[1];
4204         rcu_read_unlock();
4205
4206         mutex_lock(&ifmgd->mtx);
4207
4208         if (ifmgd->associated) {
4209                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4210
4211                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4212                                        WLAN_REASON_UNSPECIFIED,
4213                                        false, frame_buf);
4214
4215                 __cfg80211_send_deauth(sdata->dev, frame_buf,
4216                                        sizeof(frame_buf));
4217         }
4218
4219         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4220                 err = -EBUSY;
4221                 goto err_free;
4222         }
4223
4224         if (ifmgd->assoc_data) {
4225                 err = -EBUSY;
4226                 goto err_free;
4227         }
4228
4229         if (ifmgd->auth_data) {
4230                 bool match;
4231
4232                 /* keep sta info, bssid if matching */
4233                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4234                 ieee80211_destroy_auth_data(sdata, match);
4235         }
4236
4237         /* prepare assoc data */
4238
4239         ifmgd->beacon_crc_valid = false;
4240
4241         /*
4242          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4243          * We still associate in non-HT mode (11a/b/g) if any one of these
4244          * ciphers is configured as pairwise.
4245          * We can set this to true for non-11n hardware, that'll be checked
4246          * separately along with the peer capabilities.
4247          */
4248         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4249                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4250                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4251                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4252                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4253                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4254                         netdev_info(sdata->dev,
4255                                     "disabling HT/VHT due to WEP/TKIP use\n");
4256                 }
4257         }
4258
4259         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4260                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4261                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4262         }
4263
4264         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4265                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4266
4267         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4268         sband = local->hw.wiphy->bands[req->bss->channel->band];
4269         if (!sband->ht_cap.ht_supported ||
4270             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4271                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4272                 if (!bss->wmm_used)
4273                         netdev_info(sdata->dev,
4274                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4275         }
4276
4277         /* disable VHT if we don't support it or the AP doesn't use WMM */
4278         if (!sband->vht_cap.vht_supported ||
4279             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
4280                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4281                 if (!bss->wmm_used)
4282                         netdev_info(sdata->dev,
4283                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4284         }
4285
4286         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4287         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4288                sizeof(ifmgd->ht_capa_mask));
4289
4290         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4291         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4292                sizeof(ifmgd->vht_capa_mask));
4293
4294         if (req->ie && req->ie_len) {
4295                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4296                 assoc_data->ie_len = req->ie_len;
4297         }
4298
4299         assoc_data->bss = req->bss;
4300
4301         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4302                 if (ifmgd->powersave)
4303                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4304                 else
4305                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4306         } else
4307                 sdata->smps_mode = ifmgd->req_smps;
4308
4309         assoc_data->capability = req->bss->capability;
4310         assoc_data->wmm = bss->wmm_used &&
4311                           (local->hw.queues >= IEEE80211_NUM_ACS);
4312         assoc_data->supp_rates = bss->supp_rates;
4313         assoc_data->supp_rates_len = bss->supp_rates_len;
4314
4315         rcu_read_lock();
4316         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4317         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4318                 assoc_data->ap_ht_param =
4319                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4320         else
4321                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4322         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4323         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4324                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4325                        sizeof(struct ieee80211_vht_cap));
4326         else
4327                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4328         rcu_read_unlock();
4329
4330         if (bss->wmm_used && bss->uapsd_supported &&
4331             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
4332             sdata->wmm_acm != 0xff) {
4333                 assoc_data->uapsd = true;
4334                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4335         } else {
4336                 assoc_data->uapsd = false;
4337                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4338         }
4339
4340         if (req->prev_bssid)
4341                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4342
4343         if (req->use_mfp) {
4344                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4345                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4346         } else {
4347                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4348                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4349         }
4350
4351         if (req->crypto.control_port)
4352                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4353         else
4354                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4355
4356         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4357         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4358
4359         /* kick off associate process */
4360
4361         ifmgd->assoc_data = assoc_data;
4362         ifmgd->dtim_period = 0;
4363
4364         err = ieee80211_prep_connection(sdata, req->bss, true);
4365         if (err)
4366                 goto err_clear;
4367
4368         rcu_read_lock();
4369         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4370
4371         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4372             !beacon_ies) {
4373                 /*
4374                  * Wait up to one beacon interval ...
4375                  * should this be more if we miss one?
4376                  */
4377                 sdata_info(sdata, "waiting for beacon from %pM\n",
4378                            ifmgd->bssid);
4379                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4380                 assoc_data->timeout_started = true;
4381                 assoc_data->need_beacon = true;
4382         } else if (beacon_ies) {
4383                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4384                                                     beacon_ies->data,
4385                                                     beacon_ies->len);
4386                 u8 dtim_count = 0;
4387
4388                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4389                         const struct ieee80211_tim_ie *tim;
4390                         tim = (void *)(tim_ie + 2);
4391                         ifmgd->dtim_period = tim->dtim_period;
4392                         dtim_count = tim->dtim_count;
4393                 }
4394                 assoc_data->have_beacon = true;
4395                 assoc_data->timeout = jiffies;
4396                 assoc_data->timeout_started = true;
4397
4398                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4399                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4400                         sdata->vif.bss_conf.sync_device_ts =
4401                                 bss->device_ts_beacon;
4402                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4403                 }
4404         } else {
4405                 assoc_data->timeout = jiffies;
4406                 assoc_data->timeout_started = true;
4407         }
4408         rcu_read_unlock();
4409
4410         run_again(ifmgd, assoc_data->timeout);
4411
4412         if (bss->corrupt_data) {
4413                 char *corrupt_type = "data";
4414                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4415                         if (bss->corrupt_data &
4416                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4417                                 corrupt_type = "beacon and probe response";
4418                         else
4419                                 corrupt_type = "beacon";
4420                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4421                         corrupt_type = "probe response";
4422                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4423                            corrupt_type);
4424         }
4425
4426         err = 0;
4427         goto out;
4428  err_clear:
4429         memset(ifmgd->bssid, 0, ETH_ALEN);
4430         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4431         ifmgd->assoc_data = NULL;
4432  err_free:
4433         kfree(assoc_data);
4434  out:
4435         mutex_unlock(&ifmgd->mtx);
4436
4437         return err;
4438 }
4439
4440 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4441                          struct cfg80211_deauth_request *req)
4442 {
4443         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4444         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4445         bool tx = !req->local_state_change;
4446         bool report_frame = false;
4447
4448         mutex_lock(&ifmgd->mtx);
4449
4450         sdata_info(sdata,
4451                    "deauthenticating from %pM by local choice (reason=%d)\n",
4452                    req->bssid, req->reason_code);
4453
4454         if (ifmgd->auth_data) {
4455                 drv_mgd_prepare_tx(sdata->local, sdata);
4456                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4457                                                IEEE80211_STYPE_DEAUTH,
4458                                                req->reason_code, tx,
4459                                                frame_buf);
4460                 ieee80211_destroy_auth_data(sdata, false);
4461                 mutex_unlock(&ifmgd->mtx);
4462
4463                 report_frame = true;
4464                 goto out;
4465         }
4466
4467         if (ifmgd->associated &&
4468             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4469                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4470                                        req->reason_code, tx, frame_buf);
4471                 report_frame = true;
4472         }
4473         mutex_unlock(&ifmgd->mtx);
4474
4475  out:
4476         if (report_frame)
4477                 __cfg80211_send_deauth(sdata->dev, frame_buf,
4478                                        IEEE80211_DEAUTH_FRAME_LEN);
4479
4480         return 0;
4481 }
4482
4483 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4484                            struct cfg80211_disassoc_request *req)
4485 {
4486         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4487         u8 bssid[ETH_ALEN];
4488         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4489
4490         mutex_lock(&ifmgd->mtx);
4491
4492         /*
4493          * cfg80211 should catch this ... but it's racy since
4494          * we can receive a disassoc frame, process it, hand it
4495          * to cfg80211 while that's in a locked section already
4496          * trying to tell us that the user wants to disconnect.
4497          */
4498         if (ifmgd->associated != req->bss) {
4499                 mutex_unlock(&ifmgd->mtx);
4500                 return -ENOLINK;
4501         }
4502
4503         sdata_info(sdata,
4504                    "disassociating from %pM by local choice (reason=%d)\n",
4505                    req->bss->bssid, req->reason_code);
4506
4507         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4508         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4509                                req->reason_code, !req->local_state_change,
4510                                frame_buf);
4511         mutex_unlock(&ifmgd->mtx);
4512
4513         __cfg80211_send_disassoc(sdata->dev, frame_buf,
4514                                  IEEE80211_DEAUTH_FRAME_LEN);
4515
4516         return 0;
4517 }
4518
4519 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4520 {
4521         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4522
4523         /*
4524          * Make sure some work items will not run after this,
4525          * they will not do anything but might not have been
4526          * cancelled when disconnecting.
4527          */
4528         cancel_work_sync(&ifmgd->monitor_work);
4529         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4530         cancel_work_sync(&ifmgd->request_smps_work);
4531         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4532         cancel_work_sync(&ifmgd->chswitch_work);
4533
4534         mutex_lock(&ifmgd->mtx);
4535         if (ifmgd->assoc_data)
4536                 ieee80211_destroy_assoc_data(sdata, false);
4537         if (ifmgd->auth_data)
4538                 ieee80211_destroy_auth_data(sdata, false);
4539         del_timer_sync(&ifmgd->timer);
4540         mutex_unlock(&ifmgd->mtx);
4541 }
4542
4543 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4544                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4545                                gfp_t gfp)
4546 {
4547         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4548
4549         trace_api_cqm_rssi_notify(sdata, rssi_event);
4550
4551         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4552 }
4553 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);