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  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/pm_qos.h>
  23 #include <linux/crc32.h>
  24 #include <linux/slab.h>
  25 #include <linux/export.h>
  26 #include <net/mac80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "led.h"
  33
  34 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  35 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  36 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  37 #define IEEE80211_AUTH_MAX_TRIES        3
  38 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  39 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  40 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  41 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  42 #define IEEE80211_ASSOC_MAX_TRIES       3
  43
  44 static int max_nullfunc_tries = 2;
  45 module_param(max_nullfunc_tries, int, 0644);
  46 MODULE_PARM_DESC(max_nullfunc_tries,
  47                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  48
  49 static int max_probe_tries = 5;
  50 module_param(max_probe_tries, int, 0644);
  51 MODULE_PARM_DESC(max_probe_tries,
  52                  "Maximum probe tries before disconnecting (reason 4).");
  53
  54 /*
  55  * Beacon loss timeout is calculated as N frames times the
  56  * advertised beacon interval.  This may need to be somewhat
  57  * higher than what hardware might detect to account for
  58  * delays in the host processing frames. But since we also
  59  * probe on beacon miss before declaring the connection lost
  60  * default to what we want.
  61  */
  62 static int beacon_loss_count = 7;
  63 module_param(beacon_loss_count, int, 0644);
  64 MODULE_PARM_DESC(beacon_loss_count,
  65                  "Number of beacon intervals before we decide beacon was lost.");
  66
  67 /*
  68  * Time the connection can be idle before we probe
  69  * it to see if we can still talk to the AP.
  70  */
  71 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  72 /*
  73  * Time we wait for a probe response after sending
  74  * a probe request because of beacon loss or for
  75  * checking the connection still works.
  76  */
  77 static int probe_wait_ms = 500;
  78 module_param(probe_wait_ms, int, 0644);
  79 MODULE_PARM_DESC(probe_wait_ms,
  80                  "Maximum time(ms) to wait for probe response"
  81                  " before disconnecting (reason 4).");
  82
  83 /*
  84  * Weight given to the latest Beacon frame when calculating average signal
  85  * strength for Beacon frames received in the current BSS. This must be
  86  * between 1 and 15.
  87  */
  88 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  89
  90 /*
  91  * How many Beacon frames need to have been used in average signal strength
  92  * before starting to indicate signal change events.
  93  */
  94 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  95
  96 /*
  97  * We can have multiple work items (and connection probing)
  98  * scheduling this timer, but we need to take care to only
  99  * reschedule it when it should fire _earlier_ than it was
 100  * asked for before, or if it's not pending right now. This
 101  * function ensures that. Note that it then is required to
 102  * run this function for all timeouts after the first one
 103  * has happened -- the work that runs from this timer will
 104  * do that.
 105  */
 106 static void run_again(struct ieee80211_sub_if_data *sdata,
 107                       unsigned long timeout)
 108 {
 109         sdata_assert_lock(sdata);
 110
 111         if (!timer_pending(&sdata->u.mgd.timer) ||
 112             time_before(timeout, sdata->u.mgd.timer.expires))
 113                 mod_timer(&sdata->u.mgd.timer, timeout);
 114 }
 115
 116 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 117 {
 118         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 119                 return;
 120
 121         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 122                 return;
 123
 124         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 125                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 126 }
 127
 128 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 129 {
 130         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 131
 132         if (unlikely(!sdata->u.mgd.associated))
 133                 return;
 134
 135         ifmgd->probe_send_count = 0;
 136
 137         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 138                 return;
 139
 140         mod_timer(&sdata->u.mgd.conn_mon_timer,
 141                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 142 }
 143
 144 static int ecw2cw(int ecw)
 145 {
 146         return (1 << ecw) - 1;
 147 }
 148
 149 static u32
 150 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 151                              struct ieee80211_supported_band *sband,
 152                              struct ieee80211_channel *channel,
 153                              const struct ieee80211_ht_cap *ht_cap,
 154                              const struct ieee80211_ht_operation *ht_oper,
 155                              const struct ieee80211_vht_operation *vht_oper,
 156                              struct cfg80211_chan_def *chandef, bool tracking)
 157 {
 158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 159         struct cfg80211_chan_def vht_chandef;
 160         struct ieee80211_sta_ht_cap sta_ht_cap;
 161         u32 ht_cfreq, ret;
 162
 163         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 164         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 165
 166         chandef->chan = channel;
 167         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 168         chandef->center_freq1 = channel->center_freq;
 169         chandef->center_freq2 = 0;
 170
 171         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 172                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 173                 goto out;
 174         }
 175
 176         chandef->width = NL80211_CHAN_WIDTH_20;
 177
 178         if (!(ht_cap->cap_info &
 179               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 180                 ret = IEEE80211_STA_DISABLE_40MHZ;
 181                 vht_chandef = *chandef;
 182                 goto out;
 183         }
 184
 185         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 186                                                   channel->band);
 187         /* check that channel matches the right operating channel */
 188         if (!tracking && channel->center_freq != ht_cfreq) {
 189                 /*
 190                  * It's possible that some APs are confused here;
 191                  * Netgear WNDR3700 sometimes reports 4 higher than
 192                  * the actual channel in association responses, but
 193                  * since we look at probe response/beacon data here
 194                  * it should be OK.
 195                  */
 196                 sdata_info(sdata,
 197                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 198                            channel->center_freq, ht_cfreq,
 199                            ht_oper->primary_chan, channel->band);
 200                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 201                 goto out;
 202         }
 203
 204         /* check 40 MHz support, if we have it */
 205         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 206                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 207                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 208                         chandef->width = NL80211_CHAN_WIDTH_40;
 209                         chandef->center_freq1 += 10;
 210                         break;
 211                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 212                         chandef->width = NL80211_CHAN_WIDTH_40;
 213                         chandef->center_freq1 -= 10;
 214                         break;
 215                 }
 216         } else {
 217                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 218                 ret = IEEE80211_STA_DISABLE_VHT;
 219                 /* also mark 40 MHz disabled */
 220                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 221                 goto out;
 222         }
 223
 224         if (!vht_oper || !sband->vht_cap.vht_supported) {
 225                 ret = IEEE80211_STA_DISABLE_VHT;
 226                 goto out;
 227         }
 228
 229         vht_chandef.chan = channel;
 230         vht_chandef.center_freq1 =
 231                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 232                                                channel->band);
 233         vht_chandef.center_freq2 = 0;
 234
 235         switch (vht_oper->chan_width) {
 236         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 237                 vht_chandef.width = chandef->width;
 238                 vht_chandef.center_freq1 = chandef->center_freq1;
 239                 break;
 240         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 241                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 242                 break;
 243         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 244                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 245                 break;
 246         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 247                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 248                 vht_chandef.center_freq2 =
 249                         ieee80211_channel_to_frequency(
 250                                 vht_oper->center_freq_seg2_idx,
 251                                 channel->band);
 252                 break;
 253         default:
 254                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 255                         sdata_info(sdata,
 256                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 257                                    vht_oper->chan_width);
 258                 ret = IEEE80211_STA_DISABLE_VHT;
 259                 goto out;
 260         }
 261
 262         if (!cfg80211_chandef_valid(&vht_chandef)) {
 263                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 264                         sdata_info(sdata,
 265                                    "AP VHT information is invalid, disable VHT\n");
 266                 ret = IEEE80211_STA_DISABLE_VHT;
 267                 goto out;
 268         }
 269
 270         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 271                 ret = 0;
 272                 goto out;
 273         }
 274
 275         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 276                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 277                         sdata_info(sdata,
 278                                    "AP VHT information doesn't match HT, disable VHT\n");
 279                 ret = IEEE80211_STA_DISABLE_VHT;
 280                 goto out;
 281         }
 282
 283         *chandef = vht_chandef;
 284
 285         ret = 0;
 286
 287 out:
 288         /*
 289          * When tracking the current AP, don't do any further checks if the
 290          * new chandef is identical to the one we're currently using for the
 291          * connection. This keeps us from playing ping-pong with regulatory,
 292          * without it the following can happen (for example):
 293          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 294          *  - AP advertises regdom US
 295          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 296          *  - the code below detects an unsupported channel, downgrades, and
 297          *    we disconnect from the AP in the caller
 298          *  - disconnect causes CRDA to reload world regdomain and the game
 299          *    starts anew.
 300          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 301          *
 302          * It seems possible that there are still scenarios with CSA or real
 303          * bandwidth changes where a this could happen, but those cases are
 304          * less common and wouldn't completely prevent using the AP.
 305          */
 306         if (tracking &&
 307             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 308                 return ret;
 309
 310         /* don't print the message below for VHT mismatch if VHT is disabled */
 311         if (ret & IEEE80211_STA_DISABLE_VHT)
 312                 vht_chandef = *chandef;
 313
 314         /*
 315          * Ignore the DISABLED flag when we're already connected and only
 316          * tracking the APs beacon for bandwidth changes - otherwise we
 317          * might get disconnected here if we connect to an AP, update our
 318          * regulatory information based on the AP's country IE and the
 319          * information we have is wrong/outdated and disables the channel
 320          * that we're actually using for the connection to the AP.
 321          */
 322         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 323                                         tracking ? 0 :
 324                                                    IEEE80211_CHAN_DISABLED)) {
 325                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 326                         ret = IEEE80211_STA_DISABLE_HT |
 327                               IEEE80211_STA_DISABLE_VHT;
 328                         break;
 329                 }
 330
 331                 ret |= ieee80211_chandef_downgrade(chandef);
 332         }
 333
 334         if (chandef->width != vht_chandef.width && !tracking)
 335                 sdata_info(sdata,
 336                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 337
 338         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 339         return ret;
 340 }
 341
 342 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 343                                struct sta_info *sta,
 344                                const struct ieee80211_ht_cap *ht_cap,
 345                                const struct ieee80211_ht_operation *ht_oper,
 346                                const struct ieee80211_vht_operation *vht_oper,
 347                                const u8 *bssid, u32 *changed)
 348 {
 349         struct ieee80211_local *local = sdata->local;
 350         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 351         struct ieee80211_supported_band *sband;
 352         struct ieee80211_channel *chan;
 353         struct cfg80211_chan_def chandef;
 354         u16 ht_opmode;
 355         u32 flags;
 356         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 357         int ret;
 358
 359         /* if HT was/is disabled, don't track any bandwidth changes */
 360         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 361                 return 0;
 362
 363         /* don't check VHT if we associated as non-VHT station */
 364         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 365                 vht_oper = NULL;
 366
 367         if (WARN_ON_ONCE(!sta))
 368                 return -EINVAL;
 369
 370         /*
 371          * if bss configuration changed store the new one -
 372          * this may be applicable even if channel is identical
 373          */
 374         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 375         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 376                 *changed |= BSS_CHANGED_HT;
 377                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 378         }
 379
 380         chan = sdata->vif.bss_conf.chandef.chan;
 381         sband = local->hw.wiphy->bands[chan->band];
 382
 383         /* calculate new channel (type) based on HT/VHT operation IEs */
 384         flags = ieee80211_determine_chantype(sdata, sband, chan,
 385                                              ht_cap, ht_oper, vht_oper,
 386                                              &chandef, true);
 387
 388         /*
 389          * Downgrade the new channel if we associated with restricted
 390          * capabilities. For example, if we associated as a 20 MHz STA
 391          * to a 40 MHz AP (due to regulatory, capabilities or config
 392          * reasons) then switching to a 40 MHz channel now won't do us
 393          * any good -- we couldn't use it with the AP.
 394          */
 395         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 396             chandef.width == NL80211_CHAN_WIDTH_80P80)
 397                 flags |= ieee80211_chandef_downgrade(&chandef);
 398         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 399             chandef.width == NL80211_CHAN_WIDTH_160)
 400                 flags |= ieee80211_chandef_downgrade(&chandef);
 401         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 402             chandef.width > NL80211_CHAN_WIDTH_20)
 403                 flags |= ieee80211_chandef_downgrade(&chandef);
 404
 405         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 406                 return 0;
 407
 408         sdata_info(sdata,
 409                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 410                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 411                    chandef.center_freq1, chandef.center_freq2);
 412
 413         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 414                                       IEEE80211_STA_DISABLE_VHT |
 415                                       IEEE80211_STA_DISABLE_40MHZ |
 416                                       IEEE80211_STA_DISABLE_80P80MHZ |
 417                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 418             !cfg80211_chandef_valid(&chandef)) {
 419                 sdata_info(sdata,
 420                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 421                            ifmgd->bssid);
 422                 return -EINVAL;
 423         }
 424
 425         switch (chandef.width) {
 426         case NL80211_CHAN_WIDTH_20_NOHT:
 427         case NL80211_CHAN_WIDTH_20:
 428                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 429                 break;
 430         case NL80211_CHAN_WIDTH_40:
 431                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 432                 break;
 433         case NL80211_CHAN_WIDTH_80:
 434                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 435                 break;
 436         case NL80211_CHAN_WIDTH_80P80:
 437         case NL80211_CHAN_WIDTH_160:
 438                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 439                 break;
 440         default:
 441                 return -EINVAL;
 442         }
 443
 444         if (new_sta_bw > sta->cur_max_bandwidth)
 445                 new_sta_bw = sta->cur_max_bandwidth;
 446
 447         if (new_sta_bw < sta->sta.bandwidth) {
 448                 sta->sta.bandwidth = new_sta_bw;
 449                 rate_control_rate_update(local, sband, sta,
 450                                          IEEE80211_RC_BW_CHANGED);
 451         }
 452
 453         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 454         if (ret) {
 455                 sdata_info(sdata,
 456                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 457                            ifmgd->bssid);
 458                 return ret;
 459         }
 460
 461         if (new_sta_bw > sta->sta.bandwidth) {
 462                 sta->sta.bandwidth = new_sta_bw;
 463                 rate_control_rate_update(local, sband, sta,
 464                                          IEEE80211_RC_BW_CHANGED);
 465         }
 466
 467         return 0;
 468 }
 469
 470 /* frame sending functions */
 471
 472 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 473                                 struct sk_buff *skb, u8 ap_ht_param,
 474                                 struct ieee80211_supported_band *sband,
 475                                 struct ieee80211_channel *channel,
 476                                 enum ieee80211_smps_mode smps)
 477 {
 478         u8 *pos;
 479         u32 flags = channel->flags;
 480         u16 cap;
 481         struct ieee80211_sta_ht_cap ht_cap;
 482
 483         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 484
 485         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 486         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 487
 488         /* determine capability flags */
 489         cap = ht_cap.cap;
 490
 491         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 492         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 493                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 494                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 495                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 496                 }
 497                 break;
 498         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 499                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 500                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 501                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 502                 }
 503                 break;
 504         }
 505
 506         /*
 507          * If 40 MHz was disabled associate as though we weren't
 508          * capable of 40 MHz -- some broken APs will never fall
 509          * back to trying to transmit in 20 MHz.
 510          */
 511         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 512                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 513                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 514         }
 515
 516         /* set SM PS mode properly */
 517         cap &= ~IEEE80211_HT_CAP_SM_PS;
 518         switch (smps) {
 519         case IEEE80211_SMPS_AUTOMATIC:
 520         case IEEE80211_SMPS_NUM_MODES:
 521                 WARN_ON(1);
 522         case IEEE80211_SMPS_OFF:
 523                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 524                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 525                 break;
 526         case IEEE80211_SMPS_STATIC:
 527                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 528                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 529                 break;
 530         case IEEE80211_SMPS_DYNAMIC:
 531                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 532                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 533                 break;
 534         }
 535
 536         /* reserve and fill IE */
 537         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 538         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 539 }
 540
 541 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 542                                  struct sk_buff *skb,
 543                                  struct ieee80211_supported_band *sband,
 544                                  struct ieee80211_vht_cap *ap_vht_cap)
 545 {
 546         u8 *pos;
 547         u32 cap;
 548         struct ieee80211_sta_vht_cap vht_cap;
 549         u32 mask, ap_bf_sts, our_bf_sts;
 550
 551         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 552
 553         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 554         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 555
 556         /* determine capability flags */
 557         cap = vht_cap.cap;
 558
 559         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 560                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 561
 562                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 563                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 564                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 565                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 566         }
 567
 568         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 569                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 570                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 571         }
 572
 573         /*
 574          * Some APs apparently get confused if our capabilities are better
 575          * than theirs, so restrict what we advertise in the assoc request.
 576          */
 577         if (!(ap_vht_cap->vht_cap_info &
 578                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 579                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 580
 581         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 582
 583         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 584         our_bf_sts = cap & mask;
 585
 586         if (ap_bf_sts < our_bf_sts) {
 587                 cap &= ~mask;
 588                 cap |= ap_bf_sts;
 589         }
 590
 591         /* reserve and fill IE */
 592         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 593         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 594 }
 595
 596 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 597 {
 598         struct ieee80211_local *local = sdata->local;
 599         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 600         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 601         struct sk_buff *skb;
 602         struct ieee80211_mgmt *mgmt;
 603         u8 *pos, qos_info;
 604         size_t offset = 0, noffset;
 605         int i, count, rates_len, supp_rates_len, shift;
 606         u16 capab;
 607         struct ieee80211_supported_band *sband;
 608         struct ieee80211_chanctx_conf *chanctx_conf;
 609         struct ieee80211_channel *chan;
 610         u32 rate_flags, rates = 0;
 611
 612         sdata_assert_lock(sdata);
 613
 614         rcu_read_lock();
 615         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 616         if (WARN_ON(!chanctx_conf)) {
 617                 rcu_read_unlock();
 618                 return;
 619         }
 620         chan = chanctx_conf->def.chan;
 621         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 622         rcu_read_unlock();
 623         sband = local->hw.wiphy->bands[chan->band];
 624         shift = ieee80211_vif_get_shift(&sdata->vif);
 625
 626         if (assoc_data->supp_rates_len) {
 627                 /*
 628                  * Get all rates supported by the device and the AP as
 629                  * some APs don't like getting a superset of their rates
 630                  * in the association request (e.g. D-Link DAP 1353 in
 631                  * b-only mode)...
 632                  */
 633                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 634                                                      assoc_data->supp_rates,
 635                                                      assoc_data->supp_rates_len,
 636                                                      &rates);
 637         } else {
 638                 /*
 639                  * In case AP not provide any supported rates information
 640                  * before association, we send information element(s) with
 641                  * all rates that we support.
 642                  */
 643                 rates_len = 0;
 644                 for (i = 0; i < sband->n_bitrates; i++) {
 645                         if ((rate_flags & sband->bitrates[i].flags)
 646                             != rate_flags)
 647                                 continue;
 648                         rates |= BIT(i);
 649                         rates_len++;
 650                 }
 651         }
 652
 653         skb = alloc_skb(local->hw.extra_tx_headroom +
 654                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 655                         2 + assoc_data->ssid_len + /* SSID */
 656                         4 + rates_len + /* (extended) rates */
 657                         4 + /* power capability */
 658                         2 + 2 * sband->n_channels + /* supported channels */
 659                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 660                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 661                         assoc_data->ie_len + /* extra IEs */
 662                         9, /* WMM */
 663                         GFP_KERNEL);
 664         if (!skb)
 665                 return;
 666
 667         skb_reserve(skb, local->hw.extra_tx_headroom);
 668
 669         capab = WLAN_CAPABILITY_ESS;
 670
 671         if (sband->band == IEEE80211_BAND_2GHZ) {
 672                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 673                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 674                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 675                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 676         }
 677
 678         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 679                 capab |= WLAN_CAPABILITY_PRIVACY;
 680
 681         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 682             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 683                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 684
 685         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 686                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 687
 688         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 689         memset(mgmt, 0, 24);
 690         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 691         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 692         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 693
 694         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 695                 skb_put(skb, 10);
 696                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 697                                                   IEEE80211_STYPE_REASSOC_REQ);
 698                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 699                 mgmt->u.reassoc_req.listen_interval =
 700                                 cpu_to_le16(local->hw.conf.listen_interval);
 701                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 702                        ETH_ALEN);
 703         } else {
 704                 skb_put(skb, 4);
 705                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 706                                                   IEEE80211_STYPE_ASSOC_REQ);
 707                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 708                 mgmt->u.assoc_req.listen_interval =
 709                                 cpu_to_le16(local->hw.conf.listen_interval);
 710         }
 711
 712         /* SSID */
 713         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 714         *pos++ = WLAN_EID_SSID;
 715         *pos++ = assoc_data->ssid_len;
 716         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 717
 718         /* add all rates which were marked to be used above */
 719         supp_rates_len = rates_len;
 720         if (supp_rates_len > 8)
 721                 supp_rates_len = 8;
 722
 723         pos = skb_put(skb, supp_rates_len + 2);
 724         *pos++ = WLAN_EID_SUPP_RATES;
 725         *pos++ = supp_rates_len;
 726
 727         count = 0;
 728         for (i = 0; i < sband->n_bitrates; i++) {
 729                 if (BIT(i) & rates) {
 730                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 731                                                 5 * (1 << shift));
 732                         *pos++ = (u8) rate;
 733                         if (++count == 8)
 734                                 break;
 735                 }
 736         }
 737
 738         if (rates_len > count) {
 739                 pos = skb_put(skb, rates_len - count + 2);
 740                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 741                 *pos++ = rates_len - count;
 742
 743                 for (i++; i < sband->n_bitrates; i++) {
 744                         if (BIT(i) & rates) {
 745                                 int rate;
 746                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 747                                                     5 * (1 << shift));
 748                                 *pos++ = (u8) rate;
 749                         }
 750                 }
 751         }
 752
 753         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 754             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 755                 pos = skb_put(skb, 4);
 756                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 757                 *pos++ = 2;
 758                 *pos++ = 0; /* min tx power */
 759                  /* max tx power */
 760                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 761         }
 762
 763         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 764                 /* TODO: get this in reg domain format */
 765                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 766                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 767                 *pos++ = 2 * sband->n_channels;
 768                 for (i = 0; i < sband->n_channels; i++) {
 769                         *pos++ = ieee80211_frequency_to_channel(
 770                                         sband->channels[i].center_freq);
 771                         *pos++ = 1; /* one channel in the subband*/
 772                 }
 773         }
 774
 775         /* if present, add any custom IEs that go before HT */
 776         if (assoc_data->ie_len) {
 777                 static const u8 before_ht[] = {
 778                         WLAN_EID_SSID,
 779                         WLAN_EID_SUPP_RATES,
 780                         WLAN_EID_EXT_SUPP_RATES,
 781                         WLAN_EID_PWR_CAPABILITY,
 782                         WLAN_EID_SUPPORTED_CHANNELS,
 783                         WLAN_EID_RSN,
 784                         WLAN_EID_QOS_CAPA,
 785                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 786                         WLAN_EID_MOBILITY_DOMAIN,
 787                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 788                         WLAN_EID_RIC_DATA,              /* reassoc only */
 789                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 790                 };
 791                 static const u8 after_ric[] = {
 792                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 793                         WLAN_EID_HT_CAPABILITY,
 794                         WLAN_EID_BSS_COEX_2040,
 795                         WLAN_EID_EXT_CAPABILITY,
 796                         WLAN_EID_QOS_TRAFFIC_CAPA,
 797                         WLAN_EID_TIM_BCAST_REQ,
 798                         WLAN_EID_INTERWORKING,
 799                         /* 60GHz doesn't happen right now */
 800                         WLAN_EID_VHT_CAPABILITY,
 801                         WLAN_EID_OPMODE_NOTIF,
 802                 };
 803
 804                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 805                                                  assoc_data->ie_len,
 806                                                  before_ht,
 807                                                  ARRAY_SIZE(before_ht),
 808                                                  after_ric,
 809                                                  ARRAY_SIZE(after_ric),
 810                                                  offset);
 811                 pos = skb_put(skb, noffset - offset);
 812                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 813                 offset = noffset;
 814         }
 815
 816         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 817                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 818                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 819
 820         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 821                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 822                                     sband, chan, sdata->smps_mode);
 823
 824         /* if present, add any custom IEs that go before VHT */
 825         if (assoc_data->ie_len) {
 826                 static const u8 before_vht[] = {
 827                         WLAN_EID_SSID,
 828                         WLAN_EID_SUPP_RATES,
 829                         WLAN_EID_EXT_SUPP_RATES,
 830                         WLAN_EID_PWR_CAPABILITY,
 831                         WLAN_EID_SUPPORTED_CHANNELS,
 832                         WLAN_EID_RSN,
 833                         WLAN_EID_QOS_CAPA,
 834                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 835                         WLAN_EID_MOBILITY_DOMAIN,
 836                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 837                         WLAN_EID_HT_CAPABILITY,
 838                         WLAN_EID_BSS_COEX_2040,
 839                         WLAN_EID_EXT_CAPABILITY,
 840                         WLAN_EID_QOS_TRAFFIC_CAPA,
 841                         WLAN_EID_TIM_BCAST_REQ,
 842                         WLAN_EID_INTERWORKING,
 843                 };
 844
 845                 /* RIC already taken above, so no need to handle here anymore */
 846                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 847                                              before_vht, ARRAY_SIZE(before_vht),
 848                                              offset);
 849                 pos = skb_put(skb, noffset - offset);
 850                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 851                 offset = noffset;
 852         }
 853
 854         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 855                 ieee80211_add_vht_ie(sdata, skb, sband,
 856                                      &assoc_data->ap_vht_cap);
 857
 858         /* if present, add any custom non-vendor IEs that go after HT */
 859         if (assoc_data->ie_len) {
 860                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 861                                                     assoc_data->ie_len,
 862                                                     offset);
 863                 pos = skb_put(skb, noffset - offset);
 864                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 865                 offset = noffset;
 866         }
 867
 868         if (assoc_data->wmm) {
 869                 if (assoc_data->uapsd) {
 870                         qos_info = ifmgd->uapsd_queues;
 871                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 872                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 873                 } else {
 874                         qos_info = 0;
 875                 }
 876
 877                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 878         }
 879
 880         /* add any remaining custom (i.e. vendor specific here) IEs */
 881         if (assoc_data->ie_len) {
 882                 noffset = assoc_data->ie_len;
 883                 pos = skb_put(skb, noffset - offset);
 884                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 885         }
 886
 887         drv_mgd_prepare_tx(local, sdata);
 888
 889         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 890         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 891                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 892                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 893         ieee80211_tx_skb(sdata, skb);
 894 }
 895
 896 void ieee80211_send_pspoll(struct ieee80211_local *local,
 897                            struct ieee80211_sub_if_data *sdata)
 898 {
 899         struct ieee80211_pspoll *pspoll;
 900         struct sk_buff *skb;
 901
 902         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 903         if (!skb)
 904                 return;
 905
 906         pspoll = (struct ieee80211_pspoll *) skb->data;
 907         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 908
 909         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 910         ieee80211_tx_skb(sdata, skb);
 911 }
 912
 913 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 914                              struct ieee80211_sub_if_data *sdata,
 915                              int powersave)
 916 {
 917         struct sk_buff *skb;
 918         struct ieee80211_hdr_3addr *nullfunc;
 919         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 920
 921         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 922         if (!skb)
 923                 return;
 924
 925         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 926         if (powersave)
 927                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 928
 929         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 930                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 931
 932         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 933                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 934
 935         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 936                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 937
 938         ieee80211_tx_skb(sdata, skb);
 939 }
 940
 941 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 942                                           struct ieee80211_sub_if_data *sdata)
 943 {
 944         struct sk_buff *skb;
 945         struct ieee80211_hdr *nullfunc;
 946         __le16 fc;
 947
 948         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 949                 return;
 950
 951         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 952         if (!skb)
 953                 return;
 954
 955         skb_reserve(skb, local->hw.extra_tx_headroom);
 956
 957         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 958         memset(nullfunc, 0, 30);
 959         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 960                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 961         nullfunc->frame_control = fc;
 962         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 963         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 964         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 965         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 966
 967         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 968         ieee80211_tx_skb(sdata, skb);
 969 }
 970
 971 /* spectrum management related things */
 972 static void ieee80211_chswitch_work(struct work_struct *work)
 973 {
 974         struct ieee80211_sub_if_data *sdata =
 975                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 976         struct ieee80211_local *local = sdata->local;
 977         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 978         int ret;
 979
 980         if (!ieee80211_sdata_running(sdata))
 981                 return;
 982
 983         sdata_lock(sdata);
 984         mutex_lock(&local->mtx);
 985         mutex_lock(&local->chanctx_mtx);
 986
 987         if (!ifmgd->associated)
 988                 goto out;
 989
 990         if (!sdata->vif.csa_active)
 991                 goto out;
 992
 993         /*
 994          * using reservation isn't immediate as it may be deferred until later
 995          * with multi-vif. once reservation is complete it will re-schedule the
 996          * work with no reserved_chanctx so verify chandef to check if it
 997          * completed successfully
 998          */
 999
1000         if (sdata->reserved_chanctx) {
1001                 /*
1002                  * with multi-vif csa driver may call ieee80211_csa_finish()
1003                  * many times while waiting for other interfaces to use their
1004                  * reservations
1005                  */
1006                 if (sdata->reserved_ready)
1007                         goto out;
1008
1009                 ret = ieee80211_vif_use_reserved_context(sdata);
1010                 if (ret) {
1011                         sdata_info(sdata,
1012                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1013                                    ret);
1014                         ieee80211_queue_work(&sdata->local->hw,
1015                                              &ifmgd->csa_connection_drop_work);
1016                         goto out;
1017                 }
1018
1019                 goto out;
1020         }
1021
1022         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1023                                         &sdata->csa_chandef)) {
1024                 sdata_info(sdata,
1025                            "failed to finalize channel switch, disconnecting\n");
1026                 ieee80211_queue_work(&sdata->local->hw,
1027                                      &ifmgd->csa_connection_drop_work);
1028                 goto out;
1029         }
1030
1031         /* XXX: shouldn't really modify cfg80211-owned data! */
1032         ifmgd->associated->channel = sdata->csa_chandef.chan;
1033
1034         ifmgd->csa_waiting_bcn = true;
1035
1036         ieee80211_sta_reset_beacon_monitor(sdata);
1037         ieee80211_sta_reset_conn_monitor(sdata);
1038
1039 out:
1040         mutex_unlock(&local->chanctx_mtx);
1041         mutex_unlock(&local->mtx);
1042         sdata_unlock(sdata);
1043 }
1044
1045 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1046 {
1047         struct ieee80211_local *local = sdata->local;
1048         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1049         int ret;
1050
1051         sdata_assert_lock(sdata);
1052
1053         WARN_ON(!sdata->vif.csa_active);
1054
1055         if (sdata->csa_block_tx) {
1056                 ieee80211_wake_vif_queues(local, sdata,
1057                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1058                 sdata->csa_block_tx = false;
1059         }
1060
1061         sdata->vif.csa_active = false;
1062         ifmgd->csa_waiting_bcn = false;
1063
1064         ret = drv_post_channel_switch(sdata);
1065         if (ret) {
1066                 sdata_info(sdata,
1067                            "driver post channel switch failed, disconnecting\n");
1068                 ieee80211_queue_work(&local->hw,
1069                                      &ifmgd->csa_connection_drop_work);
1070                 return;
1071         }
1072
1073         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1074 }
1075
1076 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1077 {
1078         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1079         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1080
1081         trace_api_chswitch_done(sdata, success);
1082         if (!success) {
1083                 sdata_info(sdata,
1084                            "driver channel switch failed, disconnecting\n");
1085                 ieee80211_queue_work(&sdata->local->hw,
1086                                      &ifmgd->csa_connection_drop_work);
1087         } else {
1088                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1089         }
1090 }
1091 EXPORT_SYMBOL(ieee80211_chswitch_done);
1092
1093 static void ieee80211_chswitch_timer(unsigned long data)
1094 {
1095         struct ieee80211_sub_if_data *sdata =
1096                 (struct ieee80211_sub_if_data *) data;
1097
1098         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1099 }
1100
1101 static void
1102 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1103                                  u64 timestamp, u32 device_timestamp,
1104                                  struct ieee802_11_elems *elems,
1105                                  bool beacon)
1106 {
1107         struct ieee80211_local *local = sdata->local;
1108         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1109         struct cfg80211_bss *cbss = ifmgd->associated;
1110         struct ieee80211_chanctx_conf *conf;
1111         struct ieee80211_chanctx *chanctx;
1112         enum ieee80211_band current_band;
1113         struct ieee80211_csa_ie csa_ie;
1114         struct ieee80211_channel_switch ch_switch;
1115         int res;
1116
1117         sdata_assert_lock(sdata);
1118
1119         if (!cbss)
1120                 return;
1121
1122         if (local->scanning)
1123                 return;
1124
1125         /* disregard subsequent announcements if we are already processing */
1126         if (sdata->vif.csa_active)
1127                 return;
1128
1129         current_band = cbss->channel->band;
1130         memset(&csa_ie, 0, sizeof(csa_ie));
1131         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1132                                            ifmgd->flags,
1133                                            ifmgd->associated->bssid, &csa_ie);
1134         if (res < 0)
1135                 ieee80211_queue_work(&local->hw,
1136                                      &ifmgd->csa_connection_drop_work);
1137         if (res)
1138                 return;
1139
1140         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1141                                      IEEE80211_CHAN_DISABLED)) {
1142                 sdata_info(sdata,
1143                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1144                            ifmgd->associated->bssid,
1145                            csa_ie.chandef.chan->center_freq,
1146                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1147                            csa_ie.chandef.center_freq2);
1148                 ieee80211_queue_work(&local->hw,
1149                                      &ifmgd->csa_connection_drop_work);
1150                 return;
1151         }
1152
1153         mutex_lock(&local->mtx);
1154         mutex_lock(&local->chanctx_mtx);
1155         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1156                                          lockdep_is_held(&local->chanctx_mtx));
1157         if (!conf) {
1158                 sdata_info(sdata,
1159                            "no channel context assigned to vif?, disconnecting\n");
1160                 ieee80211_queue_work(&local->hw,
1161                                      &ifmgd->csa_connection_drop_work);
1162                 mutex_unlock(&local->chanctx_mtx);
1163                 mutex_unlock(&local->mtx);
1164                 return;
1165         }
1166
1167         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1168
1169         if (local->use_chanctx &&
1170             !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1171                 sdata_info(sdata,
1172                            "driver doesn't support chan-switch with channel contexts\n");
1173                 ieee80211_queue_work(&local->hw,
1174                                      &ifmgd->csa_connection_drop_work);
1175                 mutex_unlock(&local->chanctx_mtx);
1176                 mutex_unlock(&local->mtx);
1177                 return;
1178         }
1179
1180         ch_switch.timestamp = timestamp;
1181         ch_switch.device_timestamp = device_timestamp;
1182         ch_switch.block_tx = csa_ie.mode;
1183         ch_switch.chandef = csa_ie.chandef;
1184         ch_switch.count = csa_ie.count;
1185
1186         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1187                 sdata_info(sdata,
1188                            "preparing for channel switch failed, disconnecting\n");
1189                 ieee80211_queue_work(&local->hw,
1190                                      &ifmgd->csa_connection_drop_work);
1191                 mutex_unlock(&local->chanctx_mtx);
1192                 mutex_unlock(&local->mtx);
1193                 return;
1194         }
1195
1196         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1197                                             chanctx->mode, false);
1198         if (res) {
1199                 sdata_info(sdata,
1200                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1201                            res);
1202                 ieee80211_queue_work(&local->hw,
1203                                      &ifmgd->csa_connection_drop_work);
1204                 mutex_unlock(&local->chanctx_mtx);
1205                 mutex_unlock(&local->mtx);
1206                 return;
1207         }
1208         mutex_unlock(&local->chanctx_mtx);
1209
1210         sdata->vif.csa_active = true;
1211         sdata->csa_chandef = csa_ie.chandef;
1212         sdata->csa_block_tx = csa_ie.mode;
1213
1214         if (sdata->csa_block_tx)
1215                 ieee80211_stop_vif_queues(local, sdata,
1216                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1217         mutex_unlock(&local->mtx);
1218
1219         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1220                                           csa_ie.count);
1221
1222         if (local->ops->channel_switch) {
1223                 /* use driver's channel switch callback */
1224                 drv_channel_switch(local, sdata, &ch_switch);
1225                 return;
1226         }
1227
1228         /* channel switch handled in software */
1229         if (csa_ie.count <= 1)
1230                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1231         else
1232                 mod_timer(&ifmgd->chswitch_timer,
1233                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1234                                          cbss->beacon_interval));
1235 }
1236
1237 static bool
1238 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1239                                  struct ieee80211_channel *channel,
1240                                  const u8 *country_ie, u8 country_ie_len,
1241                                  const u8 *pwr_constr_elem,
1242                                  int *chan_pwr, int *pwr_reduction)
1243 {
1244         struct ieee80211_country_ie_triplet *triplet;
1245         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1246         int i, chan_increment;
1247         bool have_chan_pwr = false;
1248
1249         /* Invalid IE */
1250         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1251                 return false;
1252
1253         triplet = (void *)(country_ie + 3);
1254         country_ie_len -= 3;
1255
1256         switch (channel->band) {
1257         default:
1258                 WARN_ON_ONCE(1);
1259                 /* fall through */
1260         case IEEE80211_BAND_2GHZ:
1261         case IEEE80211_BAND_60GHZ:
1262                 chan_increment = 1;
1263                 break;
1264         case IEEE80211_BAND_5GHZ:
1265                 chan_increment = 4;
1266                 break;
1267         }
1268
1269         /* find channel */
1270         while (country_ie_len >= 3) {
1271                 u8 first_channel = triplet->chans.first_channel;
1272
1273                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1274                         goto next;
1275
1276                 for (i = 0; i < triplet->chans.num_channels; i++) {
1277                         if (first_channel + i * chan_increment == chan) {
1278                                 have_chan_pwr = true;
1279                                 *chan_pwr = triplet->chans.max_power;
1280                                 break;
1281                         }
1282                 }
1283                 if (have_chan_pwr)
1284                         break;
1285
1286  next:
1287                 triplet++;
1288                 country_ie_len -= 3;
1289         }
1290
1291         if (have_chan_pwr && pwr_constr_elem)
1292                 *pwr_reduction = *pwr_constr_elem;
1293         else
1294                 *pwr_reduction = 0;
1295
1296         return have_chan_pwr;
1297 }
1298
1299 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1300                                       struct ieee80211_channel *channel,
1301                                       const u8 *cisco_dtpc_ie,
1302                                       int *pwr_level)
1303 {
1304         /* From practical testing, the first data byte of the DTPC element
1305          * seems to contain the requested dBm level, and the CLI on Cisco
1306          * APs clearly state the range is -127 to 127 dBm, which indicates
1307          * a signed byte, although it seemingly never actually goes negative.
1308          * The other byte seems to always be zero.
1309          */
1310         *pwr_level = (__s8)cisco_dtpc_ie[4];
1311 }
1312
1313 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1314                                        struct ieee80211_channel *channel,
1315                                        struct ieee80211_mgmt *mgmt,
1316                                        const u8 *country_ie, u8 country_ie_len,
1317                                        const u8 *pwr_constr_ie,
1318                                        const u8 *cisco_dtpc_ie)
1319 {
1320         bool has_80211h_pwr = false, has_cisco_pwr = false;
1321         int chan_pwr = 0, pwr_reduction_80211h = 0;
1322         int pwr_level_cisco, pwr_level_80211h;
1323         int new_ap_level;
1324         __le16 capab = mgmt->u.probe_resp.capab_info;
1325
1326         if (country_ie &&
1327             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1328              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1329                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1330                         sdata, channel, country_ie, country_ie_len,
1331                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1332                 pwr_level_80211h =
1333                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1334         }
1335
1336         if (cisco_dtpc_ie) {
1337                 ieee80211_find_cisco_dtpc(
1338                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1339                 has_cisco_pwr = true;
1340         }
1341
1342         if (!has_80211h_pwr && !has_cisco_pwr)
1343                 return 0;
1344
1345         /* If we have both 802.11h and Cisco DTPC, apply both limits
1346          * by picking the smallest of the two power levels advertised.
1347          */
1348         if (has_80211h_pwr &&
1349             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1350                 sdata_info(sdata,
1351                            "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1352                            pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1353                            sdata->u.mgd.bssid);
1354                 new_ap_level = pwr_level_80211h;
1355         } else {  /* has_cisco_pwr is always true here. */
1356                 sdata_info(sdata,
1357                            "Limiting TX power to %d dBm as advertised by %pM\n",
1358                            pwr_level_cisco, sdata->u.mgd.bssid);
1359                 new_ap_level = pwr_level_cisco;
1360         }
1361
1362         if (sdata->ap_power_level == new_ap_level)
1363                 return 0;
1364
1365         sdata->ap_power_level = new_ap_level;
1366         if (__ieee80211_recalc_txpower(sdata))
1367                 return BSS_CHANGED_TXPOWER;
1368         return 0;
1369 }
1370
1371 /* powersave */
1372 static void ieee80211_enable_ps(struct ieee80211_local *local,
1373                                 struct ieee80211_sub_if_data *sdata)
1374 {
1375         struct ieee80211_conf *conf = &local->hw.conf;
1376
1377         /*
1378          * If we are scanning right now then the parameters will
1379          * take effect when scan finishes.
1380          */
1381         if (local->scanning)
1382                 return;
1383
1384         if (conf->dynamic_ps_timeout > 0 &&
1385             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1386                 mod_timer(&local->dynamic_ps_timer, jiffies +
1387                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1388         } else {
1389                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1390                         ieee80211_send_nullfunc(local, sdata, 1);
1391
1392                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1393                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1394                         return;
1395
1396                 conf->flags |= IEEE80211_CONF_PS;
1397                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1398         }
1399 }
1400
1401 static void ieee80211_change_ps(struct ieee80211_local *local)
1402 {
1403         struct ieee80211_conf *conf = &local->hw.conf;
1404
1405         if (local->ps_sdata) {
1406                 ieee80211_enable_ps(local, local->ps_sdata);
1407         } else if (conf->flags & IEEE80211_CONF_PS) {
1408                 conf->flags &= ~IEEE80211_CONF_PS;
1409                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1410                 del_timer_sync(&local->dynamic_ps_timer);
1411                 cancel_work_sync(&local->dynamic_ps_enable_work);
1412         }
1413 }
1414
1415 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1416 {
1417         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1418         struct sta_info *sta = NULL;
1419         bool authorized = false;
1420
1421         if (!mgd->powersave)
1422                 return false;
1423
1424         if (mgd->broken_ap)
1425                 return false;
1426
1427         if (!mgd->associated)
1428                 return false;
1429
1430         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1431                 return false;
1432
1433         if (!mgd->have_beacon)
1434                 return false;
1435
1436         rcu_read_lock();
1437         sta = sta_info_get(sdata, mgd->bssid);
1438         if (sta)
1439                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1440         rcu_read_unlock();
1441
1442         return authorized;
1443 }
1444
1445 /* need to hold RTNL or interface lock */
1446 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1447 {
1448         struct ieee80211_sub_if_data *sdata, *found = NULL;
1449         int count = 0;
1450         int timeout;
1451
1452         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1453                 local->ps_sdata = NULL;
1454                 return;
1455         }
1456
1457         list_for_each_entry(sdata, &local->interfaces, list) {
1458                 if (!ieee80211_sdata_running(sdata))
1459                         continue;
1460                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1461                         /* If an AP vif is found, then disable PS
1462                          * by setting the count to zero thereby setting
1463                          * ps_sdata to NULL.
1464                          */
1465                         count = 0;
1466                         break;
1467                 }
1468                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1469                         continue;
1470                 found = sdata;
1471                 count++;
1472         }
1473
1474         if (count == 1 && ieee80211_powersave_allowed(found)) {
1475                 s32 beaconint_us;
1476
1477                 if (latency < 0)
1478                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1479
1480                 beaconint_us = ieee80211_tu_to_usec(
1481                                         found->vif.bss_conf.beacon_int);
1482
1483                 timeout = local->dynamic_ps_forced_timeout;
1484                 if (timeout < 0) {
1485                         /*
1486                          * Go to full PSM if the user configures a very low
1487                          * latency requirement.
1488                          * The 2000 second value is there for compatibility
1489                          * until the PM_QOS_NETWORK_LATENCY is configured
1490                          * with real values.
1491                          */
1492                         if (latency > (1900 * USEC_PER_MSEC) &&
1493                             latency != (2000 * USEC_PER_SEC))
1494                                 timeout = 0;
1495                         else
1496                                 timeout = 100;
1497                 }
1498                 local->hw.conf.dynamic_ps_timeout = timeout;
1499
1500                 if (beaconint_us > latency) {
1501                         local->ps_sdata = NULL;
1502                 } else {
1503                         int maxslp = 1;
1504                         u8 dtimper = found->u.mgd.dtim_period;
1505
1506                         /* If the TIM IE is invalid, pretend the value is 1 */
1507                         if (!dtimper)
1508                                 dtimper = 1;
1509                         else if (dtimper > 1)
1510                                 maxslp = min_t(int, dtimper,
1511                                                     latency / beaconint_us);
1512
1513                         local->hw.conf.max_sleep_period = maxslp;
1514                         local->hw.conf.ps_dtim_period = dtimper;
1515                         local->ps_sdata = found;
1516                 }
1517         } else {
1518                 local->ps_sdata = NULL;
1519         }
1520
1521         ieee80211_change_ps(local);
1522 }
1523
1524 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1525 {
1526         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1527
1528         if (sdata->vif.bss_conf.ps != ps_allowed) {
1529                 sdata->vif.bss_conf.ps = ps_allowed;
1530                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1531         }
1532 }
1533
1534 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1535 {
1536         struct ieee80211_local *local =
1537                 container_of(work, struct ieee80211_local,
1538                              dynamic_ps_disable_work);
1539
1540         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1541                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1542                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1543         }
1544
1545         ieee80211_wake_queues_by_reason(&local->hw,
1546                                         IEEE80211_MAX_QUEUE_MAP,
1547                                         IEEE80211_QUEUE_STOP_REASON_PS,
1548                                         false);
1549 }
1550
1551 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1552 {
1553         struct ieee80211_local *local =
1554                 container_of(work, struct ieee80211_local,
1555                              dynamic_ps_enable_work);
1556         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1557         struct ieee80211_if_managed *ifmgd;
1558         unsigned long flags;
1559         int q;
1560
1561         /* can only happen when PS was just disabled anyway */
1562         if (!sdata)
1563                 return;
1564
1565         ifmgd = &sdata->u.mgd;
1566
1567         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1568                 return;
1569
1570         if (local->hw.conf.dynamic_ps_timeout > 0) {
1571                 /* don't enter PS if TX frames are pending */
1572                 if (drv_tx_frames_pending(local)) {
1573                         mod_timer(&local->dynamic_ps_timer, jiffies +
1574                                   msecs_to_jiffies(
1575                                   local->hw.conf.dynamic_ps_timeout));
1576                         return;
1577                 }
1578
1579                 /*
1580                  * transmission can be stopped by others which leads to
1581                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1582                  * is not the actual idle state.
1583                  */
1584                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1585                 for (q = 0; q < local->hw.queues; q++) {
1586                         if (local->queue_stop_reasons[q]) {
1587                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1588                                                        flags);
1589                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1590                                           msecs_to_jiffies(
1591                                           local->hw.conf.dynamic_ps_timeout));
1592                                 return;
1593                         }
1594                 }
1595                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1596         }
1597
1598         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1599             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1600                 if (drv_tx_frames_pending(local)) {
1601                         mod_timer(&local->dynamic_ps_timer, jiffies +
1602                                   msecs_to_jiffies(
1603                                   local->hw.conf.dynamic_ps_timeout));
1604                 } else {
1605                         ieee80211_send_nullfunc(local, sdata, 1);
1606                         /* Flush to get the tx status of nullfunc frame */
1607                         ieee80211_flush_queues(local, sdata, false);
1608                 }
1609         }
1610
1611         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1612               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1613             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1614                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1615                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1616                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1617         }
1618 }
1619
1620 void ieee80211_dynamic_ps_timer(unsigned long data)
1621 {
1622         struct ieee80211_local *local = (void *) data;
1623
1624         if (local->quiescing || local->suspended)
1625                 return;
1626
1627         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1628 }
1629
1630 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1631 {
1632         struct delayed_work *delayed_work =
1633                 container_of(work, struct delayed_work, work);
1634         struct ieee80211_sub_if_data *sdata =
1635                 container_of(delayed_work, struct ieee80211_sub_if_data,
1636                              dfs_cac_timer_work);
1637         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1638
1639         mutex_lock(&sdata->local->mtx);
1640         if (sdata->wdev.cac_started) {
1641                 ieee80211_vif_release_channel(sdata);
1642                 cfg80211_cac_event(sdata->dev, &chandef,
1643                                    NL80211_RADAR_CAC_FINISHED,
1644                                    GFP_KERNEL);
1645         }
1646         mutex_unlock(&sdata->local->mtx);
1647 }
1648
1649 static bool
1650 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1651 {
1652         struct ieee80211_local *local = sdata->local;
1653         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1654         bool ret;
1655         int ac;
1656
1657         if (local->hw.queues < IEEE80211_NUM_ACS)
1658                 return false;
1659
1660         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1661                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1662                 int non_acm_ac;
1663                 unsigned long now = jiffies;
1664
1665                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1666                     tx_tspec->admitted_time &&
1667                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1668                         tx_tspec->consumed_tx_time = 0;
1669                         tx_tspec->time_slice_start = now;
1670
1671                         if (tx_tspec->downgraded)
1672                                 tx_tspec->action =
1673                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1674                 }
1675
1676                 switch (tx_tspec->action) {
1677                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1678                         /* take the original parameters */
1679                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1680                                 sdata_err(sdata,
1681                                           "failed to set TX queue parameters for queue %d\n",
1682                                           ac);
1683                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1684                         tx_tspec->downgraded = false;
1685                         ret = true;
1686                         break;
1687                 case TX_TSPEC_ACTION_DOWNGRADE:
1688                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1689                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1690                                 ret = true;
1691                                 break;
1692                         }
1693                         /* downgrade next lower non-ACM AC */
1694                         for (non_acm_ac = ac + 1;
1695                              non_acm_ac < IEEE80211_NUM_ACS;
1696                              non_acm_ac++)
1697                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1698                                         break;
1699                         /* The loop will result in using BK even if it requires
1700                          * admission control, such configuration makes no sense
1701                          * and we have to transmit somehow - the AC selection
1702                          * does the same thing.
1703                          */
1704                         if (drv_conf_tx(local, sdata, ac,
1705                                         &sdata->tx_conf[non_acm_ac]))
1706                                 sdata_err(sdata,
1707                                           "failed to set TX queue parameters for queue %d\n",
1708                                           ac);
1709                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1710                         ret = true;
1711                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1712                                 tx_tspec->time_slice_start + HZ - now + 1);
1713                         break;
1714                 case TX_TSPEC_ACTION_NONE:
1715                         /* nothing now */
1716                         break;
1717                 }
1718         }
1719
1720         return ret;
1721 }
1722
1723 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1724 {
1725         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1726                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1727 }
1728
1729 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1730 {
1731         struct ieee80211_sub_if_data *sdata;
1732
1733         sdata = container_of(work, struct ieee80211_sub_if_data,
1734                              u.mgd.tx_tspec_wk.work);
1735         ieee80211_sta_handle_tspec_ac_params(sdata);
1736 }
1737
1738 /* MLME */
1739 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1740                                      struct ieee80211_sub_if_data *sdata,
1741                                      const u8 *wmm_param, size_t wmm_param_len)
1742 {
1743         struct ieee80211_tx_queue_params params;
1744         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1745         size_t left;
1746         int count;
1747         const u8 *pos;
1748         u8 uapsd_queues = 0;
1749
1750         if (!local->ops->conf_tx)
1751                 return false;
1752
1753         if (local->hw.queues < IEEE80211_NUM_ACS)
1754                 return false;
1755
1756         if (!wmm_param)
1757                 return false;
1758
1759         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1760                 return false;
1761
1762         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1763                 uapsd_queues = ifmgd->uapsd_queues;
1764
1765         count = wmm_param[6] & 0x0f;
1766         if (count == ifmgd->wmm_last_param_set)
1767                 return false;
1768         ifmgd->wmm_last_param_set = count;
1769
1770         pos = wmm_param + 8;
1771         left = wmm_param_len - 8;
1772
1773         memset(&params, 0, sizeof(params));
1774
1775         sdata->wmm_acm = 0;
1776         for (; left >= 4; left -= 4, pos += 4) {
1777                 int aci = (pos[0] >> 5) & 0x03;
1778                 int acm = (pos[0] >> 4) & 0x01;
1779                 bool uapsd = false;
1780                 int queue;
1781
1782                 switch (aci) {
1783                 case 1: /* AC_BK */
1784                         queue = 3;
1785                         if (acm)
1786                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1787                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1788                                 uapsd = true;
1789                         break;
1790                 case 2: /* AC_VI */
1791                         queue = 1;
1792                         if (acm)
1793                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1794                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1795                                 uapsd = true;
1796                         break;
1797                 case 3: /* AC_VO */
1798                         queue = 0;
1799                         if (acm)
1800                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1801                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1802                                 uapsd = true;
1803                         break;
1804                 case 0: /* AC_BE */
1805                 default:
1806                         queue = 2;
1807                         if (acm)
1808                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1809                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1810                                 uapsd = true;
1811                         break;
1812                 }
1813
1814                 params.aifs = pos[0] & 0x0f;
1815                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1816                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1817                 params.txop = get_unaligned_le16(pos + 2);
1818                 params.acm = acm;
1819                 params.uapsd = uapsd;
1820
1821                 mlme_dbg(sdata,
1822                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1823                          queue, aci, acm,
1824                          params.aifs, params.cw_min, params.cw_max,
1825                          params.txop, params.uapsd,
1826                          ifmgd->tx_tspec[queue].downgraded);
1827                 sdata->tx_conf[queue] = params;
1828                 if (!ifmgd->tx_tspec[queue].downgraded &&
1829                     drv_conf_tx(local, sdata, queue, &params))
1830                         sdata_err(sdata,
1831                                   "failed to set TX queue parameters for queue %d\n",
1832                                   queue);
1833         }
1834
1835         /* enable WMM or activate new settings */
1836         sdata->vif.bss_conf.qos = true;
1837         return true;
1838 }
1839
1840 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1841 {
1842         lockdep_assert_held(&sdata->local->mtx);
1843
1844         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1845         ieee80211_run_deferred_scan(sdata->local);
1846 }
1847
1848 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1849 {
1850         mutex_lock(&sdata->local->mtx);
1851         __ieee80211_stop_poll(sdata);
1852         mutex_unlock(&sdata->local->mtx);
1853 }
1854
1855 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1856                                            u16 capab, bool erp_valid, u8 erp)
1857 {
1858         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1859         u32 changed = 0;
1860         bool use_protection;
1861         bool use_short_preamble;
1862         bool use_short_slot;
1863
1864         if (erp_valid) {
1865                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1866                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1867         } else {
1868                 use_protection = false;
1869                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1870         }
1871
1872         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1873         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1874                 use_short_slot = true;
1875
1876         if (use_protection != bss_conf->use_cts_prot) {
1877                 bss_conf->use_cts_prot = use_protection;
1878                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1879         }
1880
1881         if (use_short_preamble != bss_conf->use_short_preamble) {
1882                 bss_conf->use_short_preamble = use_short_preamble;
1883                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1884         }
1885
1886         if (use_short_slot != bss_conf->use_short_slot) {
1887                 bss_conf->use_short_slot = use_short_slot;
1888                 changed |= BSS_CHANGED_ERP_SLOT;
1889         }
1890
1891         return changed;
1892 }
1893
1894 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1895                                      struct cfg80211_bss *cbss,
1896                                      u32 bss_info_changed)
1897 {
1898         struct ieee80211_bss *bss = (void *)cbss->priv;
1899         struct ieee80211_local *local = sdata->local;
1900         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1901
1902         bss_info_changed |= BSS_CHANGED_ASSOC;
1903         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1904                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1905
1906         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1907                 beacon_loss_count * bss_conf->beacon_int));
1908
1909         sdata->u.mgd.associated = cbss;
1910         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1911
1912         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1913
1914         if (sdata->vif.p2p) {
1915                 const struct cfg80211_bss_ies *ies;
1916
1917                 rcu_read_lock();
1918                 ies = rcu_dereference(cbss->ies);
1919                 if (ies) {
1920                         int ret;
1921
1922                         ret = cfg80211_get_p2p_attr(
1923                                         ies->data, ies->len,
1924                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1925                                         (u8 *) &bss_conf->p2p_noa_attr,
1926                                         sizeof(bss_conf->p2p_noa_attr));
1927                         if (ret >= 2) {
1928                                 sdata->u.mgd.p2p_noa_index =
1929                                         bss_conf->p2p_noa_attr.index;
1930                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1931                         }
1932                 }
1933                 rcu_read_unlock();
1934         }
1935
1936         /* just to be sure */
1937         ieee80211_stop_poll(sdata);
1938
1939         ieee80211_led_assoc(local, 1);
1940
1941         if (sdata->u.mgd.have_beacon) {
1942                 /*
1943                  * If the AP is buggy we may get here with no DTIM period
1944                  * known, so assume it's 1 which is the only safe assumption
1945                  * in that case, although if the TIM IE is broken powersave
1946                  * probably just won't work at all.
1947                  */
1948                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1949                 bss_conf->beacon_rate = bss->beacon_rate;
1950                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1951         } else {
1952                 bss_conf->beacon_rate = NULL;
1953                 bss_conf->dtim_period = 0;
1954         }
1955
1956         bss_conf->assoc = 1;
1957
1958         /* Tell the driver to monitor connection quality (if supported) */
1959         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1960             bss_conf->cqm_rssi_thold)
1961                 bss_info_changed |= BSS_CHANGED_CQM;
1962
1963         /* Enable ARP filtering */
1964         if (bss_conf->arp_addr_cnt)
1965                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1966
1967         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1968
1969         mutex_lock(&local->iflist_mtx);
1970         ieee80211_recalc_ps(local, -1);
1971         mutex_unlock(&local->iflist_mtx);
1972
1973         ieee80211_recalc_smps(sdata);
1974         ieee80211_recalc_ps_vif(sdata);
1975
1976         netif_carrier_on(sdata->dev);
1977 }
1978
1979 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1980                                    u16 stype, u16 reason, bool tx,
1981                                    u8 *frame_buf)
1982 {
1983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1984         struct ieee80211_local *local = sdata->local;
1985         u32 changed = 0;
1986
1987         sdata_assert_lock(sdata);
1988
1989         if (WARN_ON_ONCE(tx && !frame_buf))
1990                 return;
1991
1992         if (WARN_ON(!ifmgd->associated))
1993                 return;
1994
1995         ieee80211_stop_poll(sdata);
1996
1997         ifmgd->associated = NULL;
1998         netif_carrier_off(sdata->dev);
1999
2000         /*
2001          * if we want to get out of ps before disassoc (why?) we have
2002          * to do it before sending disassoc, as otherwise the null-packet
2003          * won't be valid.
2004          */
2005         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2006                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2007                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2008         }
2009         local->ps_sdata = NULL;
2010
2011         /* disable per-vif ps */
2012         ieee80211_recalc_ps_vif(sdata);
2013
2014         /*
2015          * drop any frame before deauth/disassoc, this can be data or
2016          * management frame. Since we are disconnecting, we should not
2017          * insist sending these frames which can take time and delay
2018          * the disconnection and possible the roaming.
2019          */
2020         if (tx)
2021                 ieee80211_flush_queues(local, sdata, true);
2022
2023         /* deauthenticate/disassociate now */
2024         if (tx || frame_buf)
2025                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2026                                                reason, tx, frame_buf);
2027
2028         /* flush out frame - make sure the deauth was actually sent */
2029         if (tx)
2030                 ieee80211_flush_queues(local, sdata, false);
2031
2032         /* clear bssid only after building the needed mgmt frames */
2033         memset(ifmgd->bssid, 0, ETH_ALEN);
2034
2035         /* remove AP and TDLS peers */
2036         sta_info_flush(sdata);
2037
2038         /* finally reset all BSS / config parameters */
2039         changed |= ieee80211_reset_erp_info(sdata);
2040
2041         ieee80211_led_assoc(local, 0);
2042         changed |= BSS_CHANGED_ASSOC;
2043         sdata->vif.bss_conf.assoc = false;
2044
2045         ifmgd->p2p_noa_index = -1;
2046         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2047                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2048
2049         /* on the next assoc, re-program HT/VHT parameters */
2050         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2051         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2052         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2053         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2054
2055         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2056
2057         del_timer_sync(&local->dynamic_ps_timer);
2058         cancel_work_sync(&local->dynamic_ps_enable_work);
2059
2060         /* Disable ARP filtering */
2061         if (sdata->vif.bss_conf.arp_addr_cnt)
2062                 changed |= BSS_CHANGED_ARP_FILTER;
2063
2064         sdata->vif.bss_conf.qos = false;
2065         changed |= BSS_CHANGED_QOS;
2066
2067         /* The BSSID (not really interesting) and HT changed */
2068         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2069         ieee80211_bss_info_change_notify(sdata, changed);
2070
2071         /* disassociated - set to defaults now */
2072         ieee80211_set_wmm_default(sdata, false);
2073
2074         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2075         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2076         del_timer_sync(&sdata->u.mgd.timer);
2077         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2078
2079         sdata->vif.bss_conf.dtim_period = 0;
2080         sdata->vif.bss_conf.beacon_rate = NULL;
2081
2082         ifmgd->have_beacon = false;
2083
2084         ifmgd->flags = 0;
2085         mutex_lock(&local->mtx);
2086         ieee80211_vif_release_channel(sdata);
2087
2088         sdata->vif.csa_active = false;
2089         ifmgd->csa_waiting_bcn = false;
2090         if (sdata->csa_block_tx) {
2091                 ieee80211_wake_vif_queues(local, sdata,
2092                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2093                 sdata->csa_block_tx = false;
2094         }
2095         mutex_unlock(&local->mtx);
2096
2097         /* existing TX TSPEC sessions no longer exist */
2098         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2099         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2100
2101         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2102 }
2103
2104 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2105                              struct ieee80211_hdr *hdr)
2106 {
2107         /*
2108          * We can postpone the mgd.timer whenever receiving unicast frames
2109          * from AP because we know that the connection is working both ways
2110          * at that time. But multicast frames (and hence also beacons) must
2111          * be ignored here, because we need to trigger the timer during
2112          * data idle periods for sending the periodic probe request to the
2113          * AP we're connected to.
2114          */
2115         if (is_multicast_ether_addr(hdr->addr1))
2116                 return;
2117
2118         ieee80211_sta_reset_conn_monitor(sdata);
2119 }
2120
2121 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2122 {
2123         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2124         struct ieee80211_local *local = sdata->local;
2125
2126         mutex_lock(&local->mtx);
2127         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2128                 goto out;
2129
2130         __ieee80211_stop_poll(sdata);
2131
2132         mutex_lock(&local->iflist_mtx);
2133         ieee80211_recalc_ps(local, -1);
2134         mutex_unlock(&local->iflist_mtx);
2135
2136         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2137                 goto out;
2138
2139         /*
2140          * We've received a probe response, but are not sure whether
2141          * we have or will be receiving any beacons or data, so let's
2142          * schedule the timers again, just in case.
2143          */
2144         ieee80211_sta_reset_beacon_monitor(sdata);
2145
2146         mod_timer(&ifmgd->conn_mon_timer,
2147                   round_jiffies_up(jiffies +
2148                                    IEEE80211_CONNECTION_IDLE_TIME));
2149 out:
2150         mutex_unlock(&local->mtx);
2151 }
2152
2153 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2154                                            struct ieee80211_hdr *hdr,
2155                                            u16 tx_time)
2156 {
2157         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2158         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2159         int ac = ieee80211_ac_from_tid(tid);
2160         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2161         unsigned long now = jiffies;
2162
2163         if (likely(!tx_tspec->admitted_time))
2164                 return;
2165
2166         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2167                 tx_tspec->consumed_tx_time = 0;
2168                 tx_tspec->time_slice_start = now;
2169
2170                 if (tx_tspec->downgraded) {
2171                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2172                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2173                 }
2174         }
2175
2176         if (tx_tspec->downgraded)
2177                 return;
2178
2179         tx_tspec->consumed_tx_time += tx_time;
2180
2181         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2182                 tx_tspec->downgraded = true;
2183                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2184                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2185         }
2186 }
2187
2188 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2189                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2190 {
2191         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2192
2193         if (!ieee80211_is_data(hdr->frame_control))
2194             return;
2195
2196         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2197             sdata->u.mgd.probe_send_count > 0) {
2198                 if (ack)
2199                         ieee80211_sta_reset_conn_monitor(sdata);
2200                 else
2201                         sdata->u.mgd.nullfunc_failed = true;
2202                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2203                 return;
2204         }
2205
2206         if (ack)
2207                 ieee80211_sta_reset_conn_monitor(sdata);
2208 }
2209
2210 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2211 {
2212         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2213         const u8 *ssid;
2214         u8 *dst = ifmgd->associated->bssid;
2215         u8 unicast_limit = max(1, max_probe_tries - 3);
2216
2217         /*
2218          * Try sending broadcast probe requests for the last three
2219          * probe requests after the first ones failed since some
2220          * buggy APs only support broadcast probe requests.
2221          */
2222         if (ifmgd->probe_send_count >= unicast_limit)
2223                 dst = NULL;
2224
2225         /*
2226          * When the hardware reports an accurate Tx ACK status, it's
2227          * better to send a nullfunc frame instead of a probe request,
2228          * as it will kick us off the AP quickly if we aren't associated
2229          * anymore. The timeout will be reset if the frame is ACKed by
2230          * the AP.
2231          */
2232         ifmgd->probe_send_count++;
2233
2234         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2235                 ifmgd->nullfunc_failed = false;
2236                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2237         } else {
2238                 int ssid_len;
2239
2240                 rcu_read_lock();
2241                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2242                 if (WARN_ON_ONCE(ssid == NULL))
2243                         ssid_len = 0;
2244                 else
2245                         ssid_len = ssid[1];
2246
2247                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
2248                                          ssid + 2, ssid_len, NULL,
2249                                          0, (u32) -1, true, 0,
2250                                          ifmgd->associated->channel, false);
2251                 rcu_read_unlock();
2252         }
2253
2254         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2255         run_again(sdata, ifmgd->probe_timeout);
2256 }
2257
2258 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2259                                    bool beacon)
2260 {
2261         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2262         bool already = false;
2263
2264         if (!ieee80211_sdata_running(sdata))
2265                 return;
2266
2267         sdata_lock(sdata);
2268
2269         if (!ifmgd->associated)
2270                 goto out;
2271
2272         mutex_lock(&sdata->local->mtx);
2273
2274         if (sdata->local->tmp_channel || sdata->local->scanning) {
2275                 mutex_unlock(&sdata->local->mtx);
2276                 goto out;
2277         }
2278
2279         if (beacon) {
2280                 mlme_dbg_ratelimited(sdata,
2281                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2282                                      beacon_loss_count);
2283
2284                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2285         }
2286
2287         /*
2288          * The driver/our work has already reported this event or the
2289          * connection monitoring has kicked in and we have already sent
2290          * a probe request. Or maybe the AP died and the driver keeps
2291          * reporting until we disassociate...
2292          *
2293          * In either case we have to ignore the current call to this
2294          * function (except for setting the correct probe reason bit)
2295          * because otherwise we would reset the timer every time and
2296          * never check whether we received a probe response!
2297          */
2298         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2299                 already = true;
2300
2301         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2302
2303         mutex_unlock(&sdata->local->mtx);
2304
2305         if (already)
2306                 goto out;
2307
2308         mutex_lock(&sdata->local->iflist_mtx);
2309         ieee80211_recalc_ps(sdata->local, -1);
2310         mutex_unlock(&sdata->local->iflist_mtx);
2311
2312         ifmgd->probe_send_count = 0;
2313         ieee80211_mgd_probe_ap_send(sdata);
2314  out:
2315         sdata_unlock(sdata);
2316 }
2317
2318 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2319                                           struct ieee80211_vif *vif)
2320 {
2321         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2322         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2323         struct cfg80211_bss *cbss;
2324         struct sk_buff *skb;
2325         const u8 *ssid;
2326         int ssid_len;
2327
2328         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2329                 return NULL;
2330
2331         sdata_assert_lock(sdata);
2332
2333         if (ifmgd->associated)
2334                 cbss = ifmgd->associated;
2335         else if (ifmgd->auth_data)
2336                 cbss = ifmgd->auth_data->bss;
2337         else if (ifmgd->assoc_data)
2338                 cbss = ifmgd->assoc_data->bss;
2339         else
2340                 return NULL;
2341
2342         rcu_read_lock();
2343         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2344         if (WARN_ON_ONCE(ssid == NULL))
2345                 ssid_len = 0;
2346         else
2347                 ssid_len = ssid[1];
2348
2349         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2350                                         (u32) -1, cbss->channel,
2351                                         ssid + 2, ssid_len,
2352                                         NULL, 0, true);
2353         rcu_read_unlock();
2354
2355         return skb;
2356 }
2357 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2358
2359 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2360 {
2361         struct ieee80211_local *local = sdata->local;
2362         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2363         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2364
2365         sdata_lock(sdata);
2366         if (!ifmgd->associated) {
2367                 sdata_unlock(sdata);
2368                 return;
2369         }
2370
2371         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2372                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2373                                true, frame_buf);
2374         mutex_lock(&local->mtx);
2375         sdata->vif.csa_active = false;
2376         ifmgd->csa_waiting_bcn = false;
2377         if (sdata->csa_block_tx) {
2378                 ieee80211_wake_vif_queues(local, sdata,
2379                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2380                 sdata->csa_block_tx = false;
2381         }
2382         mutex_unlock(&local->mtx);
2383
2384         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2385                               IEEE80211_DEAUTH_FRAME_LEN);
2386         sdata_unlock(sdata);
2387 }
2388
2389 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2390 {
2391         struct ieee80211_sub_if_data *sdata =
2392                 container_of(work, struct ieee80211_sub_if_data,
2393                              u.mgd.beacon_connection_loss_work);
2394         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2395         struct sta_info *sta;
2396
2397         if (ifmgd->associated) {
2398                 rcu_read_lock();
2399                 sta = sta_info_get(sdata, ifmgd->bssid);
2400                 if (sta)
2401                         sta->beacon_loss_count++;
2402                 rcu_read_unlock();
2403         }
2404
2405         if (ifmgd->connection_loss) {
2406                 sdata_info(sdata, "Connection to AP %pM lost\n",
2407                            ifmgd->bssid);
2408                 __ieee80211_disconnect(sdata);
2409         } else {
2410                 ieee80211_mgd_probe_ap(sdata, true);
2411         }
2412 }
2413
2414 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2415 {
2416         struct ieee80211_sub_if_data *sdata =
2417                 container_of(work, struct ieee80211_sub_if_data,
2418                              u.mgd.csa_connection_drop_work);
2419
2420         __ieee80211_disconnect(sdata);
2421 }
2422
2423 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2424 {
2425         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2426         struct ieee80211_hw *hw = &sdata->local->hw;
2427
2428         trace_api_beacon_loss(sdata);
2429
2430         sdata->u.mgd.connection_loss = false;
2431         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2432 }
2433 EXPORT_SYMBOL(ieee80211_beacon_loss);
2434
2435 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2436 {
2437         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2438         struct ieee80211_hw *hw = &sdata->local->hw;
2439
2440         trace_api_connection_loss(sdata);
2441
2442         sdata->u.mgd.connection_loss = true;
2443         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2444 }
2445 EXPORT_SYMBOL(ieee80211_connection_loss);
2446
2447
2448 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2449                                         bool assoc)
2450 {
2451         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2452
2453         sdata_assert_lock(sdata);
2454
2455         if (!assoc) {
2456                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2457
2458                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2459                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2460                 sdata->u.mgd.flags = 0;
2461                 mutex_lock(&sdata->local->mtx);
2462                 ieee80211_vif_release_channel(sdata);
2463                 mutex_unlock(&sdata->local->mtx);
2464         }
2465
2466         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2467         kfree(auth_data);
2468         sdata->u.mgd.auth_data = NULL;
2469 }
2470
2471 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2472                                      struct ieee80211_mgmt *mgmt, size_t len)
2473 {
2474         struct ieee80211_local *local = sdata->local;
2475         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2476         u8 *pos;
2477         struct ieee802_11_elems elems;
2478         u32 tx_flags = 0;
2479
2480         pos = mgmt->u.auth.variable;
2481         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2482         if (!elems.challenge)
2483                 return;
2484         auth_data->expected_transaction = 4;
2485         drv_mgd_prepare_tx(sdata->local, sdata);
2486         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2487                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2488                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2489         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2490                             elems.challenge - 2, elems.challenge_len + 2,
2491                             auth_data->bss->bssid, auth_data->bss->bssid,
2492                             auth_data->key, auth_data->key_len,
2493                             auth_data->key_idx, tx_flags);
2494 }
2495
2496 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2497                                    struct ieee80211_mgmt *mgmt, size_t len)
2498 {
2499         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2500         u8 bssid[ETH_ALEN];
2501         u16 auth_alg, auth_transaction, status_code;
2502         struct sta_info *sta;
2503
2504         sdata_assert_lock(sdata);
2505
2506         if (len < 24 + 6)
2507                 return;
2508
2509         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2510                 return;
2511
2512         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2513
2514         if (!ether_addr_equal(bssid, mgmt->bssid))
2515                 return;
2516
2517         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2518         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2519         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2520
2521         if (auth_alg != ifmgd->auth_data->algorithm ||
2522             auth_transaction != ifmgd->auth_data->expected_transaction) {
2523                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2524                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2525                            auth_transaction,
2526                            ifmgd->auth_data->expected_transaction);
2527                 return;
2528         }
2529
2530         if (status_code != WLAN_STATUS_SUCCESS) {
2531                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2532                            mgmt->sa, status_code);
2533                 ieee80211_destroy_auth_data(sdata, false);
2534                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2535                 return;
2536         }
2537
2538         switch (ifmgd->auth_data->algorithm) {
2539         case WLAN_AUTH_OPEN:
2540         case WLAN_AUTH_LEAP:
2541         case WLAN_AUTH_FT:
2542         case WLAN_AUTH_SAE:
2543                 break;
2544         case WLAN_AUTH_SHARED_KEY:
2545                 if (ifmgd->auth_data->expected_transaction != 4) {
2546                         ieee80211_auth_challenge(sdata, mgmt, len);
2547                         /* need another frame */
2548                         return;
2549                 }
2550                 break;
2551         default:
2552                 WARN_ONCE(1, "invalid auth alg %d",
2553                           ifmgd->auth_data->algorithm);
2554                 return;
2555         }
2556
2557         sdata_info(sdata, "authenticated\n");
2558         ifmgd->auth_data->done = true;
2559         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2560         ifmgd->auth_data->timeout_started = true;
2561         run_again(sdata, ifmgd->auth_data->timeout);
2562
2563         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2564             ifmgd->auth_data->expected_transaction != 2) {
2565                 /*
2566                  * Report auth frame to user space for processing since another
2567                  * round of Authentication frames is still needed.
2568                  */
2569                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2570                 return;
2571         }
2572
2573         /* move station state to auth */
2574         mutex_lock(&sdata->local->sta_mtx);
2575         sta = sta_info_get(sdata, bssid);
2576         if (!sta) {
2577                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2578                 goto out_err;
2579         }
2580         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2581                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2582                 goto out_err;
2583         }
2584         mutex_unlock(&sdata->local->sta_mtx);
2585
2586         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2587         return;
2588  out_err:
2589         mutex_unlock(&sdata->local->sta_mtx);
2590         /* ignore frame -- wait for timeout */
2591 }
2592
2593 #define case_WLAN(type) \
2594         case WLAN_REASON_##type: return #type
2595
2596 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2597 {
2598         switch (reason_code) {
2599         case_WLAN(UNSPECIFIED);
2600         case_WLAN(PREV_AUTH_NOT_VALID);
2601         case_WLAN(DEAUTH_LEAVING);
2602         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2603         case_WLAN(DISASSOC_AP_BUSY);
2604         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2605         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2606         case_WLAN(DISASSOC_STA_HAS_LEFT);
2607         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2608         case_WLAN(DISASSOC_BAD_POWER);
2609         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2610         case_WLAN(INVALID_IE);
2611         case_WLAN(MIC_FAILURE);
2612         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2613         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2614         case_WLAN(IE_DIFFERENT);
2615         case_WLAN(INVALID_GROUP_CIPHER);
2616         case_WLAN(INVALID_PAIRWISE_CIPHER);
2617         case_WLAN(INVALID_AKMP);
2618         case_WLAN(UNSUPP_RSN_VERSION);
2619         case_WLAN(INVALID_RSN_IE_CAP);
2620         case_WLAN(IEEE8021X_FAILED);
2621         case_WLAN(CIPHER_SUITE_REJECTED);
2622         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2623         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2624         case_WLAN(DISASSOC_LOW_ACK);
2625         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2626         case_WLAN(QSTA_LEAVE_QBSS);
2627         case_WLAN(QSTA_NOT_USE);
2628         case_WLAN(QSTA_REQUIRE_SETUP);
2629         case_WLAN(QSTA_TIMEOUT);
2630         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2631         case_WLAN(MESH_PEER_CANCELED);
2632         case_WLAN(MESH_MAX_PEERS);
2633         case_WLAN(MESH_CONFIG);
2634         case_WLAN(MESH_CLOSE);
2635         case_WLAN(MESH_MAX_RETRIES);
2636         case_WLAN(MESH_CONFIRM_TIMEOUT);
2637         case_WLAN(MESH_INVALID_GTK);
2638         case_WLAN(MESH_INCONSISTENT_PARAM);
2639         case_WLAN(MESH_INVALID_SECURITY);
2640         case_WLAN(MESH_PATH_ERROR);
2641         case_WLAN(MESH_PATH_NOFORWARD);
2642         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2643         case_WLAN(MAC_EXISTS_IN_MBSS);
2644         case_WLAN(MESH_CHAN_REGULATORY);
2645         case_WLAN(MESH_CHAN);
2646         default: return "<unknown>";
2647         }
2648 }
2649
2650 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2651                                      struct ieee80211_mgmt *mgmt, size_t len)
2652 {
2653         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2654         const u8 *bssid = NULL;
2655         u16 reason_code;
2656
2657         sdata_assert_lock(sdata);
2658
2659         if (len < 24 + 2)
2660                 return;
2661
2662         if (!ifmgd->associated ||
2663             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2664                 return;
2665
2666         bssid = ifmgd->associated->bssid;
2667
2668         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2669
2670         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2671                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2672
2673         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2674
2675         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2676 }
2677
2678
2679 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2680                                        struct ieee80211_mgmt *mgmt, size_t len)
2681 {
2682         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2683         u16 reason_code;
2684
2685         sdata_assert_lock(sdata);
2686
2687         if (len < 24 + 2)
2688                 return;
2689
2690         if (!ifmgd->associated ||
2691             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2692                 return;
2693
2694         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2695
2696         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2697                    mgmt->sa, reason_code);
2698
2699         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2700
2701         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2702 }
2703
2704 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2705                                 u8 *supp_rates, unsigned int supp_rates_len,
2706                                 u32 *rates, u32 *basic_rates,
2707                                 bool *have_higher_than_11mbit,
2708                                 int *min_rate, int *min_rate_index,
2709                                 int shift, u32 rate_flags)
2710 {
2711         int i, j;
2712
2713         for (i = 0; i < supp_rates_len; i++) {
2714                 int rate = supp_rates[i] & 0x7f;
2715                 bool is_basic = !!(supp_rates[i] & 0x80);
2716
2717                 if ((rate * 5 * (1 << shift)) > 110)
2718                         *have_higher_than_11mbit = true;
2719
2720                 /*
2721                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2722                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2723                  *
2724                  * Note: Even through the membership selector and the basic
2725                  *       rate flag share the same bit, they are not exactly
2726                  *       the same.
2727                  */
2728                 if (!!(supp_rates[i] & 0x80) &&
2729                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2730                         continue;
2731
2732                 for (j = 0; j < sband->n_bitrates; j++) {
2733                         struct ieee80211_rate *br;
2734                         int brate;
2735
2736                         br = &sband->bitrates[j];
2737                         if ((rate_flags & br->flags) != rate_flags)
2738                                 continue;
2739
2740                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2741                         if (brate == rate) {
2742                                 *rates |= BIT(j);
2743                                 if (is_basic)
2744                                         *basic_rates |= BIT(j);
2745                                 if ((rate * 5) < *min_rate) {
2746                                         *min_rate = rate * 5;
2747                                         *min_rate_index = j;
2748                                 }
2749                                 break;
2750                         }
2751                 }
2752         }
2753 }
2754
2755 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2756                                          bool assoc)
2757 {
2758         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2759
2760         sdata_assert_lock(sdata);
2761
2762         if (!assoc) {
2763                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2764
2765                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2766                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2767                 sdata->u.mgd.flags = 0;
2768                 mutex_lock(&sdata->local->mtx);
2769                 ieee80211_vif_release_channel(sdata);
2770                 mutex_unlock(&sdata->local->mtx);
2771         }
2772
2773         kfree(assoc_data);
2774         sdata->u.mgd.assoc_data = NULL;
2775 }
2776
2777 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2778                                     struct cfg80211_bss *cbss,
2779                                     struct ieee80211_mgmt *mgmt, size_t len)
2780 {
2781         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2782         struct ieee80211_local *local = sdata->local;
2783         struct ieee80211_supported_band *sband;
2784         struct sta_info *sta;
2785         u8 *pos;
2786         u16 capab_info, aid;
2787         struct ieee802_11_elems elems;
2788         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2789         const struct cfg80211_bss_ies *bss_ies = NULL;
2790         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2791         u32 changed = 0;
2792         int err;
2793         bool ret;
2794
2795         /* AssocResp and ReassocResp have identical structure */
2796
2797         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2798         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2799
2800         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2801                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2802                            aid);
2803         aid &= ~(BIT(15) | BIT(14));
2804
2805         ifmgd->broken_ap = false;
2806
2807         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2808                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2809                            aid);
2810                 aid = 0;
2811                 ifmgd->broken_ap = true;
2812         }
2813
2814         pos = mgmt->u.assoc_resp.variable;
2815         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2816
2817         if (!elems.supp_rates) {
2818                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2819                 return false;
2820         }
2821
2822         ifmgd->aid = aid;
2823         ifmgd->tdls_chan_switch_prohibited =
2824                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2825                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2826
2827         /*
2828          * Some APs are erroneously not including some information in their
2829          * (re)association response frames. Try to recover by using the data
2830          * from the beacon or probe response. This seems to afflict mobile
2831          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2832          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2833          */
2834         if ((assoc_data->wmm && !elems.wmm_param) ||
2835             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2836              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2837             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2838              (!elems.vht_cap_elem || !elems.vht_operation))) {
2839                 const struct cfg80211_bss_ies *ies;
2840                 struct ieee802_11_elems bss_elems;
2841
2842                 rcu_read_lock();
2843                 ies = rcu_dereference(cbss->ies);
2844                 if (ies)
2845                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2846                                           GFP_ATOMIC);
2847                 rcu_read_unlock();
2848                 if (!bss_ies)
2849                         return false;
2850
2851                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2852                                        false, &bss_elems);
2853                 if (assoc_data->wmm &&
2854                     !elems.wmm_param && bss_elems.wmm_param) {
2855                         elems.wmm_param = bss_elems.wmm_param;
2856                         sdata_info(sdata,
2857                                    "AP bug: WMM param missing from AssocResp\n");
2858                 }
2859
2860                 /*
2861                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2862                  * have to include the IEs in the (re)association response.
2863                  */
2864                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2865                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2866                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2867                         sdata_info(sdata,
2868                                    "AP bug: HT capability missing from AssocResp\n");
2869                 }
2870                 if (!elems.ht_operation && bss_elems.ht_operation &&
2871                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2872                         elems.ht_operation = bss_elems.ht_operation;
2873                         sdata_info(sdata,
2874                                    "AP bug: HT operation missing from AssocResp\n");
2875                 }
2876                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2877                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2878                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2879                         sdata_info(sdata,
2880                                    "AP bug: VHT capa missing from AssocResp\n");
2881                 }
2882                 if (!elems.vht_operation && bss_elems.vht_operation &&
2883                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2884                         elems.vht_operation = bss_elems.vht_operation;
2885                         sdata_info(sdata,
2886                                    "AP bug: VHT operation missing from AssocResp\n");
2887                 }
2888         }
2889
2890         /*
2891          * We previously checked these in the beacon/probe response, so
2892          * they should be present here. This is just a safety net.
2893          */
2894         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2895             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2896                 sdata_info(sdata,
2897                            "HT AP is missing WMM params or HT capability/operation\n");
2898                 ret = false;
2899                 goto out;
2900         }
2901
2902         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2903             (!elems.vht_cap_elem || !elems.vht_operation)) {
2904                 sdata_info(sdata,
2905                            "VHT AP is missing VHT capability/operation\n");
2906                 ret = false;
2907                 goto out;
2908         }
2909
2910         mutex_lock(&sdata->local->sta_mtx);
2911         /*
2912          * station info was already allocated and inserted before
2913          * the association and should be available to us
2914          */
2915         sta = sta_info_get(sdata, cbss->bssid);
2916         if (WARN_ON(!sta)) {
2917                 mutex_unlock(&sdata->local->sta_mtx);
2918                 ret = false;
2919                 goto out;
2920         }
2921
2922         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2923
2924         /* Set up internal HT/VHT capabilities */
2925         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2926                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2927                                                   elems.ht_cap_elem, sta);
2928
2929         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2930                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2931                                                     elems.vht_cap_elem, sta);
2932
2933         /*
2934          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2935          * in their association response, so ignore that data for our own
2936          * configuration. If it changed since the last beacon, we'll get the
2937          * next beacon and update then.
2938          */
2939
2940         /*
2941          * If an operating mode notification IE is present, override the
2942          * NSS calculation (that would be done in rate_control_rate_init())
2943          * and use the # of streams from that element.
2944          */
2945         if (elems.opmode_notif &&
2946             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2947                 u8 nss;
2948
2949                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2950                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2951                 nss += 1;
2952                 sta->sta.rx_nss = nss;
2953         }
2954
2955         rate_control_rate_init(sta);
2956
2957         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2958                 set_sta_flag(sta, WLAN_STA_MFP);
2959
2960         sta->sta.wme = elems.wmm_param;
2961
2962         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2963         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2964                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2965         if (err) {
2966                 sdata_info(sdata,
2967                            "failed to move station %pM to desired state\n",
2968                            sta->sta.addr);
2969                 WARN_ON(__sta_info_destroy(sta));
2970                 mutex_unlock(&sdata->local->sta_mtx);
2971                 ret = false;
2972                 goto out;
2973         }
2974
2975         mutex_unlock(&sdata->local->sta_mtx);
2976
2977         /*
2978          * Always handle WMM once after association regardless
2979          * of the first value the AP uses. Setting -1 here has
2980          * that effect because the AP values is an unsigned
2981          * 4-bit value.
2982          */
2983         ifmgd->wmm_last_param_set = -1;
2984
2985         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2986                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2987                                          elems.wmm_param_len);
2988         else
2989                 ieee80211_set_wmm_default(sdata, false);
2990         changed |= BSS_CHANGED_QOS;
2991
2992         /* set AID and assoc capability,
2993          * ieee80211_set_associated() will tell the driver */
2994         bss_conf->aid = aid;
2995         bss_conf->assoc_capability = capab_info;
2996         ieee80211_set_associated(sdata, cbss, changed);
2997
2998         /*
2999          * If we're using 4-addr mode, let the AP know that we're
3000          * doing so, so that it can create the STA VLAN on its side
3001          */
3002         if (ifmgd->use_4addr)
3003                 ieee80211_send_4addr_nullfunc(local, sdata);
3004
3005         /*
3006          * Start timer to probe the connection to the AP now.
3007          * Also start the timer that will detect beacon loss.
3008          */
3009         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3010         ieee80211_sta_reset_beacon_monitor(sdata);
3011
3012         ret = true;
3013  out:
3014         kfree(bss_ies);
3015         return ret;
3016 }
3017
3018 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3019                                          struct ieee80211_mgmt *mgmt,
3020                                          size_t len)
3021 {
3022         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3023         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3024         u16 capab_info, status_code, aid;
3025         struct ieee802_11_elems elems;
3026         int ac, uapsd_queues = -1;
3027         u8 *pos;
3028         bool reassoc;
3029         struct cfg80211_bss *bss;
3030
3031         sdata_assert_lock(sdata);
3032
3033         if (!assoc_data)
3034                 return;
3035         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3036                 return;
3037
3038         /*
3039          * AssocResp and ReassocResp have identical structure, so process both
3040          * of them in this function.
3041          */
3042
3043         if (len < 24 + 6)
3044                 return;
3045
3046         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3047         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3048         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3049         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3050
3051         sdata_info(sdata,
3052                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3053                    reassoc ? "Rea" : "A", mgmt->sa,
3054                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3055
3056         pos = mgmt->u.assoc_resp.variable;
3057         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3058
3059         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3060             elems.timeout_int &&
3061             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3062                 u32 tu, ms;
3063                 tu = le32_to_cpu(elems.timeout_int->value);
3064                 ms = tu * 1024 / 1000;
3065                 sdata_info(sdata,
3066                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3067                            mgmt->sa, tu, ms);
3068                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3069                 assoc_data->timeout_started = true;
3070                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3071                         run_again(sdata, assoc_data->timeout);
3072                 return;
3073         }
3074
3075         bss = assoc_data->bss;
3076
3077         if (status_code != WLAN_STATUS_SUCCESS) {
3078                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3079                            mgmt->sa, status_code);
3080                 ieee80211_destroy_assoc_data(sdata, false);
3081         } else {
3082                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3083                         /* oops -- internal error -- send timeout for now */
3084                         ieee80211_destroy_assoc_data(sdata, false);
3085                         cfg80211_assoc_timeout(sdata->dev, bss);
3086                         return;
3087                 }
3088                 sdata_info(sdata, "associated\n");
3089
3090                 /*
3091                  * destroy assoc_data afterwards, as otherwise an idle
3092                  * recalc after assoc_data is NULL but before associated
3093                  * is set can cause the interface to go idle
3094                  */
3095                 ieee80211_destroy_assoc_data(sdata, true);
3096
3097                 /* get uapsd queues configuration */
3098                 uapsd_queues = 0;
3099                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3100                         if (sdata->tx_conf[ac].uapsd)
3101                                 uapsd_queues |= BIT(ac);
3102         }
3103
3104         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3105 }
3106
3107 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3108                                   struct ieee80211_mgmt *mgmt, size_t len,
3109                                   struct ieee80211_rx_status *rx_status,
3110                                   struct ieee802_11_elems *elems)
3111 {
3112         struct ieee80211_local *local = sdata->local;
3113         struct ieee80211_bss *bss;
3114         struct ieee80211_channel *channel;
3115
3116         sdata_assert_lock(sdata);
3117
3118         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3119         if (!channel)
3120                 return;
3121
3122         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3123                                         channel);
3124         if (bss) {
3125                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3126                 ieee80211_rx_bss_put(local, bss);
3127         }
3128 }
3129
3130
3131 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3132                                          struct sk_buff *skb)
3133 {
3134         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3135         struct ieee80211_if_managed *ifmgd;
3136         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3137         size_t baselen, len = skb->len;
3138         struct ieee802_11_elems elems;
3139
3140         ifmgd = &sdata->u.mgd;
3141
3142         sdata_assert_lock(sdata);
3143
3144         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3145                 return; /* ignore ProbeResp to foreign address */
3146
3147         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3148         if (baselen > len)
3149                 return;
3150
3151         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3152                                false, &elems);
3153
3154         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3155
3156         if (ifmgd->associated &&
3157             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3158                 ieee80211_reset_ap_probe(sdata);
3159
3160         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3161             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3162                 /* got probe response, continue with auth */
3163                 sdata_info(sdata, "direct probe responded\n");
3164                 ifmgd->auth_data->tries = 0;
3165                 ifmgd->auth_data->timeout = jiffies;
3166                 ifmgd->auth_data->timeout_started = true;
3167                 run_again(sdata, ifmgd->auth_data->timeout);
3168         }
3169 }
3170
3171 /*
3172  * This is the canonical list of information elements we care about,
3173  * the filter code also gives us all changes to the Microsoft OUI
3174  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3175  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3176  * changes to requested client power.
3177  *
3178  * We implement beacon filtering in software since that means we can
3179  * avoid processing the frame here and in cfg80211, and userspace
3180  * will not be able to tell whether the hardware supports it or not.
3181  *
3182  * XXX: This list needs to be dynamic -- userspace needs to be able to
3183  *      add items it requires. It also needs to be able to tell us to
3184  *      look out for other vendor IEs.
3185  */
3186 static const u64 care_about_ies =
3187         (1ULL << WLAN_EID_COUNTRY) |
3188         (1ULL << WLAN_EID_ERP_INFO) |
3189         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3190         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3191         (1ULL << WLAN_EID_HT_CAPABILITY) |
3192         (1ULL << WLAN_EID_HT_OPERATION);
3193
3194 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3195                                      struct ieee80211_mgmt *mgmt, size_t len,
3196                                      struct ieee80211_rx_status *rx_status)
3197 {
3198         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3199         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3200         size_t baselen;
3201         struct ieee802_11_elems elems;
3202         struct ieee80211_local *local = sdata->local;
3203         struct ieee80211_chanctx_conf *chanctx_conf;
3204         struct ieee80211_channel *chan;
3205         struct sta_info *sta;
3206         u32 changed = 0;
3207         bool erp_valid;
3208         u8 erp_value = 0;
3209         u32 ncrc;
3210         u8 *bssid;
3211         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3212
3213         sdata_assert_lock(sdata);
3214
3215         /* Process beacon from the current BSS */
3216         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3217         if (baselen > len)
3218                 return;
3219
3220         rcu_read_lock();
3221         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3222         if (!chanctx_conf) {
3223                 rcu_read_unlock();
3224                 return;
3225         }
3226
3227         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3228                 rcu_read_unlock();
3229                 return;
3230         }
3231         chan = chanctx_conf->def.chan;
3232         rcu_read_unlock();
3233
3234         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3235             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3236                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3237                                        len - baselen, false, &elems);
3238
3239                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3240                 if (elems.tim && !elems.parse_error) {
3241                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3242                         ifmgd->dtim_period = tim_ie->dtim_period;
3243                 }
3244                 ifmgd->have_beacon = true;
3245                 ifmgd->assoc_data->need_beacon = false;
3246                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3247                         sdata->vif.bss_conf.sync_tsf =
3248                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3249                         sdata->vif.bss_conf.sync_device_ts =
3250                                 rx_status->device_timestamp;
3251                         if (elems.tim)
3252                                 sdata->vif.bss_conf.sync_dtim_count =
3253                                         elems.tim->dtim_count;
3254                         else
3255                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3256                 }
3257                 /* continue assoc process */
3258                 ifmgd->assoc_data->timeout = jiffies;
3259                 ifmgd->assoc_data->timeout_started = true;
3260                 run_again(sdata, ifmgd->assoc_data->timeout);
3261                 return;
3262         }
3263
3264         if (!ifmgd->associated ||
3265             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3266                 return;
3267         bssid = ifmgd->associated->bssid;
3268
3269         /* Track average RSSI from the Beacon frames of the current AP */
3270         ifmgd->last_beacon_signal = rx_status->signal;
3271         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3272                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3273                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3274                 ifmgd->last_cqm_event_signal = 0;
3275                 ifmgd->count_beacon_signal = 1;
3276                 ifmgd->last_ave_beacon_signal = 0;
3277         } else {
3278                 ifmgd->ave_beacon_signal =
3279                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3280                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3281                          ifmgd->ave_beacon_signal) / 16;
3282                 ifmgd->count_beacon_signal++;
3283         }
3284
3285         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3286             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3287                 int sig = ifmgd->ave_beacon_signal;
3288                 int last_sig = ifmgd->last_ave_beacon_signal;
3289
3290                 /*
3291                  * if signal crosses either of the boundaries, invoke callback
3292                  * with appropriate parameters
3293                  */
3294                 if (sig > ifmgd->rssi_max_thold &&
3295                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3296                         ifmgd->last_ave_beacon_signal = sig;
3297                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3298                 } else if (sig < ifmgd->rssi_min_thold &&
3299                            (last_sig >= ifmgd->rssi_max_thold ||
3300                            last_sig == 0)) {
3301                         ifmgd->last_ave_beacon_signal = sig;
3302                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3303                 }
3304         }
3305
3306         if (bss_conf->cqm_rssi_thold &&
3307             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3308             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3309                 int sig = ifmgd->ave_beacon_signal / 16;
3310                 int last_event = ifmgd->last_cqm_event_signal;
3311                 int thold = bss_conf->cqm_rssi_thold;
3312                 int hyst = bss_conf->cqm_rssi_hyst;
3313                 if (sig < thold &&
3314                     (last_event == 0 || sig < last_event - hyst)) {
3315                         ifmgd->last_cqm_event_signal = sig;
3316                         ieee80211_cqm_rssi_notify(
3317                                 &sdata->vif,
3318                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3319                                 GFP_KERNEL);
3320                 } else if (sig > thold &&
3321                            (last_event == 0 || sig > last_event + hyst)) {
3322                         ifmgd->last_cqm_event_signal = sig;
3323                         ieee80211_cqm_rssi_notify(
3324                                 &sdata->vif,
3325                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3326                                 GFP_KERNEL);
3327                 }
3328         }
3329
3330         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3331                 mlme_dbg_ratelimited(sdata,
3332                                      "cancelling AP probe due to a received beacon\n");
3333                 ieee80211_reset_ap_probe(sdata);
3334         }
3335
3336         /*
3337          * Push the beacon loss detection into the future since
3338          * we are processing a beacon from the AP just now.
3339          */
3340         ieee80211_sta_reset_beacon_monitor(sdata);
3341
3342         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3343         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3344                                           len - baselen, false, &elems,
3345                                           care_about_ies, ncrc);
3346
3347         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3348                 bool directed_tim = ieee80211_check_tim(elems.tim,
3349                                                         elems.tim_len,
3350                                                         ifmgd->aid);
3351                 if (directed_tim) {
3352                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3353                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3354                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3355                                         ieee80211_hw_config(local,
3356                                                             IEEE80211_CONF_CHANGE_PS);
3357                                 }
3358                                 ieee80211_send_nullfunc(local, sdata, 0);
3359                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3360                                 local->pspolling = true;
3361
3362                                 /*
3363                                  * Here is assumed that the driver will be
3364                                  * able to send ps-poll frame and receive a
3365                                  * response even though power save mode is
3366                                  * enabled, but some drivers might require
3367                                  * to disable power save here. This needs
3368                                  * to be investigated.
3369                                  */
3370                                 ieee80211_send_pspoll(local, sdata);
3371                         }
3372                 }
3373         }
3374
3375         if (sdata->vif.p2p) {
3376                 struct ieee80211_p2p_noa_attr noa = {};
3377                 int ret;
3378
3379                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3380                                             len - baselen,
3381                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3382                                             (u8 *) &noa, sizeof(noa));
3383                 if (ret >= 2) {
3384                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3385                                 /* valid noa_attr and index changed */
3386                                 sdata->u.mgd.p2p_noa_index = noa.index;
3387                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3388                                 changed |= BSS_CHANGED_P2P_PS;
3389                                 /*
3390                                  * make sure we update all information, the CRC
3391                                  * mechanism doesn't look at P2P attributes.
3392                                  */
3393                                 ifmgd->beacon_crc_valid = false;
3394                         }
3395                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3396                         /* noa_attr not found and we had valid noa_attr before */
3397                         sdata->u.mgd.p2p_noa_index = -1;
3398                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3399                         changed |= BSS_CHANGED_P2P_PS;
3400                         ifmgd->beacon_crc_valid = false;
3401                 }
3402         }
3403
3404         if (ifmgd->csa_waiting_bcn)
3405                 ieee80211_chswitch_post_beacon(sdata);
3406
3407         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3408                 return;
3409         ifmgd->beacon_crc = ncrc;
3410         ifmgd->beacon_crc_valid = true;
3411
3412         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3413
3414         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3415                                          rx_status->device_timestamp,
3416                                          &elems, true);
3417
3418         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3419             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3420                                      elems.wmm_param_len))
3421                 changed |= BSS_CHANGED_QOS;
3422
3423         /*
3424          * If we haven't had a beacon before, tell the driver about the
3425          * DTIM period (and beacon timing if desired) now.
3426          */
3427         if (!ifmgd->have_beacon) {
3428                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3429                 if (elems.tim)
3430                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3431                 else
3432                         bss_conf->dtim_period = 1;
3433
3434                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3435                         sdata->vif.bss_conf.sync_tsf =
3436                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3437                         sdata->vif.bss_conf.sync_device_ts =
3438                                 rx_status->device_timestamp;
3439                         if (elems.tim)
3440                                 sdata->vif.bss_conf.sync_dtim_count =
3441                                         elems.tim->dtim_count;
3442                         else
3443                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3444                 }
3445
3446                 changed |= BSS_CHANGED_BEACON_INFO;
3447                 ifmgd->have_beacon = true;
3448
3449                 mutex_lock(&local->iflist_mtx);
3450                 ieee80211_recalc_ps(local, -1);
3451                 mutex_unlock(&local->iflist_mtx);
3452
3453                 ieee80211_recalc_ps_vif(sdata);
3454         }
3455
3456         if (elems.erp_info) {
3457                 erp_valid = true;
3458                 erp_value = elems.erp_info[0];
3459         } else {
3460                 erp_valid = false;
3461         }
3462         changed |= ieee80211_handle_bss_capability(sdata,
3463                         le16_to_cpu(mgmt->u.beacon.capab_info),
3464                         erp_valid, erp_value);
3465
3466         mutex_lock(&local->sta_mtx);
3467         sta = sta_info_get(sdata, bssid);
3468
3469         if (ieee80211_config_bw(sdata, sta,
3470                                 elems.ht_cap_elem, elems.ht_operation,
3471                                 elems.vht_operation, bssid, &changed)) {
3472                 mutex_unlock(&local->sta_mtx);
3473                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3474                                        WLAN_REASON_DEAUTH_LEAVING,
3475                                        true, deauth_buf);
3476                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3477                                       sizeof(deauth_buf));
3478                 return;
3479         }
3480
3481         if (sta && elems.opmode_notif)
3482                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3483                                             rx_status->band, true);
3484         mutex_unlock(&local->sta_mtx);
3485
3486         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3487                                                elems.country_elem,
3488                                                elems.country_elem_len,
3489                                                elems.pwr_constr_elem,
3490                                                elems.cisco_dtpc_elem);
3491
3492         ieee80211_bss_info_change_notify(sdata, changed);
3493 }
3494
3495 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3496                                   struct sk_buff *skb)
3497 {
3498         struct ieee80211_rx_status *rx_status;
3499         struct ieee80211_mgmt *mgmt;
3500         u16 fc;
3501         struct ieee802_11_elems elems;
3502         int ies_len;
3503
3504         rx_status = (struct ieee80211_rx_status *) skb->cb;
3505         mgmt = (struct ieee80211_mgmt *) skb->data;
3506         fc = le16_to_cpu(mgmt->frame_control);
3507
3508         sdata_lock(sdata);
3509
3510         switch (fc & IEEE80211_FCTL_STYPE) {
3511         case IEEE80211_STYPE_BEACON:
3512                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3513                 break;
3514         case IEEE80211_STYPE_PROBE_RESP:
3515                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3516                 break;
3517         case IEEE80211_STYPE_AUTH:
3518                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3519                 break;
3520         case IEEE80211_STYPE_DEAUTH:
3521                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3522                 break;
3523         case IEEE80211_STYPE_DISASSOC:
3524                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3525                 break;
3526         case IEEE80211_STYPE_ASSOC_RESP:
3527         case IEEE80211_STYPE_REASSOC_RESP:
3528                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3529                 break;
3530         case IEEE80211_STYPE_ACTION:
3531                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3532                         ies_len = skb->len -
3533                                   offsetof(struct ieee80211_mgmt,
3534                                            u.action.u.chan_switch.variable);
3535
3536                         if (ies_len < 0)
3537                                 break;
3538
3539                         ieee802_11_parse_elems(
3540                                 mgmt->u.action.u.chan_switch.variable,
3541                                 ies_len, true, &elems);
3542
3543                         if (elems.parse_error)
3544                                 break;
3545
3546                         ieee80211_sta_process_chanswitch(sdata,
3547                                                  rx_status->mactime,
3548                                                  rx_status->device_timestamp,
3549                                                  &elems, false);
3550                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3551                         ies_len = skb->len -
3552                                   offsetof(struct ieee80211_mgmt,
3553                                            u.action.u.ext_chan_switch.variable);
3554
3555                         if (ies_len < 0)
3556                                 break;
3557
3558                         ieee802_11_parse_elems(
3559                                 mgmt->u.action.u.ext_chan_switch.variable,
3560                                 ies_len, true, &elems);
3561
3562                         if (elems.parse_error)
3563                                 break;
3564
3565                         /* for the handling code pretend this was also an IE */
3566                         elems.ext_chansw_ie =
3567                                 &mgmt->u.action.u.ext_chan_switch.data;
3568
3569                         ieee80211_sta_process_chanswitch(sdata,
3570                                                  rx_status->mactime,
3571                                                  rx_status->device_timestamp,
3572                                                  &elems, false);
3573                 }
3574                 break;
3575         }
3576         sdata_unlock(sdata);
3577 }
3578
3579 static void ieee80211_sta_timer(unsigned long data)
3580 {
3581         struct ieee80211_sub_if_data *sdata =
3582                 (struct ieee80211_sub_if_data *) data;
3583
3584         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3585 }
3586
3587 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3588                                           u8 *bssid, u8 reason, bool tx)
3589 {
3590         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3591
3592         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3593                                tx, frame_buf);
3594
3595         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3596                               IEEE80211_DEAUTH_FRAME_LEN);
3597 }
3598
3599 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3600 {
3601         struct ieee80211_local *local = sdata->local;
3602         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3603         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3604         u32 tx_flags = 0;
3605
3606         sdata_assert_lock(sdata);
3607
3608         if (WARN_ON_ONCE(!auth_data))
3609                 return -EINVAL;
3610
3611         auth_data->tries++;
3612
3613         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3614                 sdata_info(sdata, "authentication with %pM timed out\n",
3615                            auth_data->bss->bssid);
3616
3617                 /*
3618                  * Most likely AP is not in the range so remove the
3619                  * bss struct for that AP.
3620                  */
3621                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3622
3623                 return -ETIMEDOUT;
3624         }
3625
3626         drv_mgd_prepare_tx(local, sdata);
3627
3628         if (auth_data->bss->proberesp_ies) {
3629                 u16 trans = 1;
3630                 u16 status = 0;
3631
3632                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3633                            auth_data->bss->bssid, auth_data->tries,
3634                            IEEE80211_AUTH_MAX_TRIES);
3635
3636                 auth_data->expected_transaction = 2;
3637
3638                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3639                         trans = auth_data->sae_trans;
3640                         status = auth_data->sae_status;
3641                         auth_data->expected_transaction = trans;
3642                 }
3643
3644                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3645                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3646                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3647
3648                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3649                                     auth_data->data, auth_data->data_len,
3650                                     auth_data->bss->bssid,
3651                                     auth_data->bss->bssid, NULL, 0, 0,
3652                                     tx_flags);
3653         } else {
3654                 const u8 *ssidie;
3655
3656                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3657                            auth_data->bss->bssid, auth_data->tries,
3658                            IEEE80211_AUTH_MAX_TRIES);
3659
3660                 rcu_read_lock();
3661                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3662                 if (!ssidie) {
3663                         rcu_read_unlock();
3664                         return -EINVAL;
3665                 }
3666                 /*
3667                  * Direct probe is sent to broadcast address as some APs
3668                  * will not answer to direct packet in unassociated state.
3669                  */
3670                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
3671                                          ssidie + 2, ssidie[1],
3672                                          NULL, 0, (u32) -1, true, 0,
3673                                          auth_data->bss->channel, false);
3674                 rcu_read_unlock();
3675         }
3676
3677         if (tx_flags == 0) {
3678                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3679                 auth_data->timeout_started = true;
3680                 run_again(sdata, auth_data->timeout);
3681         } else {
3682                 auth_data->timeout =
3683                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3684                 auth_data->timeout_started = true;
3685                 run_again(sdata, auth_data->timeout);
3686         }
3687
3688         return 0;
3689 }
3690
3691 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3692 {
3693         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3694         struct ieee80211_local *local = sdata->local;
3695
3696         sdata_assert_lock(sdata);
3697
3698         assoc_data->tries++;
3699         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3700                 sdata_info(sdata, "association with %pM timed out\n",
3701                            assoc_data->bss->bssid);
3702
3703                 /*
3704                  * Most likely AP is not in the range so remove the
3705                  * bss struct for that AP.
3706                  */
3707                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3708
3709                 return -ETIMEDOUT;
3710         }
3711
3712         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3713                    assoc_data->bss->bssid, assoc_data->tries,
3714                    IEEE80211_ASSOC_MAX_TRIES);
3715         ieee80211_send_assoc(sdata);
3716
3717         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3718                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3719                 assoc_data->timeout_started = true;
3720                 run_again(sdata, assoc_data->timeout);
3721         } else {
3722                 assoc_data->timeout =
3723                         round_jiffies_up(jiffies +
3724                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3725                 assoc_data->timeout_started = true;
3726                 run_again(sdata, assoc_data->timeout);
3727         }
3728
3729         return 0;
3730 }
3731
3732 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3733                                   __le16 fc, bool acked)
3734 {
3735         struct ieee80211_local *local = sdata->local;
3736
3737         sdata->u.mgd.status_fc = fc;
3738         sdata->u.mgd.status_acked = acked;
3739         sdata->u.mgd.status_received = true;
3740
3741         ieee80211_queue_work(&local->hw, &sdata->work);
3742 }
3743
3744 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3745 {
3746         struct ieee80211_local *local = sdata->local;
3747         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3748
3749         sdata_lock(sdata);
3750
3751         if (ifmgd->status_received) {
3752                 __le16 fc = ifmgd->status_fc;
3753                 bool status_acked = ifmgd->status_acked;
3754
3755                 ifmgd->status_received = false;
3756                 if (ifmgd->auth_data &&
3757                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3758                         if (status_acked) {
3759                                 ifmgd->auth_data->timeout =
3760                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3761                                 run_again(sdata, ifmgd->auth_data->timeout);
3762                         } else {
3763                                 ifmgd->auth_data->timeout = jiffies - 1;
3764                         }
3765                         ifmgd->auth_data->timeout_started = true;
3766                 } else if (ifmgd->assoc_data &&
3767                            (ieee80211_is_assoc_req(fc) ||
3768                             ieee80211_is_reassoc_req(fc))) {
3769                         if (status_acked) {
3770                                 ifmgd->assoc_data->timeout =
3771                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3772                                 run_again(sdata, ifmgd->assoc_data->timeout);
3773                         } else {
3774                                 ifmgd->assoc_data->timeout = jiffies - 1;
3775                         }
3776                         ifmgd->assoc_data->timeout_started = true;
3777                 }
3778         }
3779
3780         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3781             time_after(jiffies, ifmgd->auth_data->timeout)) {
3782                 if (ifmgd->auth_data->done) {
3783                         /*
3784                          * ok ... we waited for assoc but userspace didn't,
3785                          * so let's just kill the auth data
3786                          */
3787                         ieee80211_destroy_auth_data(sdata, false);
3788                 } else if (ieee80211_probe_auth(sdata)) {
3789                         u8 bssid[ETH_ALEN];
3790
3791                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3792
3793                         ieee80211_destroy_auth_data(sdata, false);
3794
3795                         cfg80211_auth_timeout(sdata->dev, bssid);
3796                 }
3797         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3798                 run_again(sdata, ifmgd->auth_data->timeout);
3799
3800         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3801             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3802                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3803                     ieee80211_do_assoc(sdata)) {
3804                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3805
3806                         ieee80211_destroy_assoc_data(sdata, false);
3807                         cfg80211_assoc_timeout(sdata->dev, bss);
3808                 }
3809         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3810                 run_again(sdata, ifmgd->assoc_data->timeout);
3811
3812         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3813             ifmgd->associated) {
3814                 u8 bssid[ETH_ALEN];
3815                 int max_tries;
3816
3817                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3818
3819                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3820                         max_tries = max_nullfunc_tries;
3821                 else
3822                         max_tries = max_probe_tries;
3823
3824                 /* ACK received for nullfunc probing frame */
3825                 if (!ifmgd->probe_send_count)
3826                         ieee80211_reset_ap_probe(sdata);
3827                 else if (ifmgd->nullfunc_failed) {
3828                         if (ifmgd->probe_send_count < max_tries) {
3829                                 mlme_dbg(sdata,
3830                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3831                                          bssid, ifmgd->probe_send_count,
3832                                          max_tries);
3833                                 ieee80211_mgd_probe_ap_send(sdata);
3834                         } else {
3835                                 mlme_dbg(sdata,
3836                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3837                                          bssid);
3838                                 ieee80211_sta_connection_lost(sdata, bssid,
3839                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3840                                         false);
3841                         }
3842                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3843                         run_again(sdata, ifmgd->probe_timeout);
3844                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3845                         mlme_dbg(sdata,
3846                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3847                                  bssid, probe_wait_ms);
3848                         ieee80211_sta_connection_lost(sdata, bssid,
3849                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3850                 } else if (ifmgd->probe_send_count < max_tries) {
3851                         mlme_dbg(sdata,
3852                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3853                                  bssid, probe_wait_ms,
3854                                  ifmgd->probe_send_count, max_tries);
3855                         ieee80211_mgd_probe_ap_send(sdata);
3856                 } else {
3857                         /*
3858                          * We actually lost the connection ... or did we?
3859                          * Let's make sure!
3860                          */
3861                         wiphy_debug(local->hw.wiphy,
3862                                     "%s: No probe response from AP %pM"
3863                                     " after %dms, disconnecting.\n",
3864                                     sdata->name,
3865                                     bssid, probe_wait_ms);
3866
3867                         ieee80211_sta_connection_lost(sdata, bssid,
3868                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3869                 }
3870         }
3871
3872         sdata_unlock(sdata);
3873 }
3874
3875 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3876 {
3877         struct ieee80211_sub_if_data *sdata =
3878                 (struct ieee80211_sub_if_data *) data;
3879         struct ieee80211_local *local = sdata->local;
3880         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3881
3882         if (local->quiescing)
3883                 return;
3884
3885         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3886                 return;
3887
3888         sdata->u.mgd.connection_loss = false;
3889         ieee80211_queue_work(&sdata->local->hw,
3890                              &sdata->u.mgd.beacon_connection_loss_work);
3891 }
3892
3893 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3894 {
3895         struct ieee80211_sub_if_data *sdata =
3896                 (struct ieee80211_sub_if_data *) data;
3897         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3898         struct ieee80211_local *local = sdata->local;
3899
3900         if (local->quiescing)
3901                 return;
3902
3903         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3904                 return;
3905
3906         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3907 }
3908
3909 static void ieee80211_sta_monitor_work(struct work_struct *work)
3910 {
3911         struct ieee80211_sub_if_data *sdata =
3912                 container_of(work, struct ieee80211_sub_if_data,
3913                              u.mgd.monitor_work);
3914
3915         ieee80211_mgd_probe_ap(sdata, false);
3916 }
3917
3918 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3919 {
3920         u32 flags;
3921
3922         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3923                 __ieee80211_stop_poll(sdata);
3924
3925                 /* let's probe the connection once */
3926                 flags = sdata->local->hw.flags;
3927                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3928                         ieee80211_queue_work(&sdata->local->hw,
3929                                              &sdata->u.mgd.monitor_work);
3930                 /* and do all the other regular work too */
3931                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3932         }
3933 }
3934
3935 #ifdef CONFIG_PM
3936 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3937 {
3938         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3939         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3940
3941         sdata_lock(sdata);
3942
3943         if (ifmgd->auth_data || ifmgd->assoc_data) {
3944                 const u8 *bssid = ifmgd->auth_data ?
3945                                 ifmgd->auth_data->bss->bssid :
3946                                 ifmgd->assoc_data->bss->bssid;
3947
3948                 /*
3949                  * If we are trying to authenticate / associate while suspending,
3950                  * cfg80211 won't know and won't actually abort those attempts,
3951                  * thus we need to do that ourselves.
3952                  */
3953                 ieee80211_send_deauth_disassoc(sdata, bssid,
3954                                                IEEE80211_STYPE_DEAUTH,
3955                                                WLAN_REASON_DEAUTH_LEAVING,
3956                                                false, frame_buf);
3957                 if (ifmgd->assoc_data)
3958                         ieee80211_destroy_assoc_data(sdata, false);
3959                 if (ifmgd->auth_data)
3960                         ieee80211_destroy_auth_data(sdata, false);
3961                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3962                                       IEEE80211_DEAUTH_FRAME_LEN);
3963         }
3964
3965         sdata_unlock(sdata);
3966 }
3967
3968 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3969 {
3970         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3971
3972         sdata_lock(sdata);
3973         if (!ifmgd->associated) {
3974                 sdata_unlock(sdata);
3975                 return;
3976         }
3977
3978         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3979                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3980                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3981                 ieee80211_sta_connection_lost(sdata,
3982                                               ifmgd->associated->bssid,
3983                                               WLAN_REASON_UNSPECIFIED,
3984                                               true);
3985                 sdata_unlock(sdata);
3986                 return;
3987         }
3988         sdata_unlock(sdata);
3989 }
3990 #endif
3991
3992 /* interface setup */
3993 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3994 {
3995         struct ieee80211_if_managed *ifmgd;
3996
3997         ifmgd = &sdata->u.mgd;
3998         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3999         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4000         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4001                   ieee80211_beacon_connection_loss_work);
4002         INIT_WORK(&ifmgd->csa_connection_drop_work,
4003                   ieee80211_csa_connection_drop_work);
4004         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4005         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4006                           ieee80211_tdls_peer_del_work);
4007         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4008                     (unsigned long) sdata);
4009         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4010                     (unsigned long) sdata);
4011         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4012                     (unsigned long) sdata);
4013         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4014                     (unsigned long) sdata);
4015         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4016                           ieee80211_sta_handle_tspec_ac_params_wk);
4017
4018         ifmgd->flags = 0;
4019         ifmgd->powersave = sdata->wdev.ps;
4020         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4021         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4022         ifmgd->p2p_noa_index = -1;
4023
4024         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4025                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4026         else
4027                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4028
4029         /* Setup TDLS data */
4030         spin_lock_init(&ifmgd->teardown_lock);
4031         ifmgd->teardown_skb = NULL;
4032         ifmgd->orig_teardown_skb = NULL;
4033 }
4034
4035 /* scan finished notification */
4036 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4037 {
4038         struct ieee80211_sub_if_data *sdata;
4039
4040         /* Restart STA timers */
4041         rcu_read_lock();
4042         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4043                 if (ieee80211_sdata_running(sdata))
4044                         ieee80211_restart_sta_timer(sdata);
4045         }
4046         rcu_read_unlock();
4047 }
4048
4049 int ieee80211_max_network_latency(struct notifier_block *nb,
4050                                   unsigned long data, void *dummy)
4051 {
4052         s32 latency_usec = (s32) data;
4053         struct ieee80211_local *local =
4054                 container_of(nb, struct ieee80211_local,
4055                              network_latency_notifier);
4056
4057         mutex_lock(&local->iflist_mtx);
4058         ieee80211_recalc_ps(local, latency_usec);
4059         mutex_unlock(&local->iflist_mtx);
4060
4061         return NOTIFY_OK;
4062 }
4063
4064 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4065                                      struct cfg80211_bss *cbss)
4066 {
4067         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4068         const u8 *ht_cap_ie, *vht_cap_ie;
4069         const struct ieee80211_ht_cap *ht_cap;
4070         const struct ieee80211_vht_cap *vht_cap;
4071         u8 chains = 1;
4072
4073         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4074                 return chains;
4075
4076         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4077         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4078                 ht_cap = (void *)(ht_cap_ie + 2);
4079                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4080                 /*
4081                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4082                  *       "Tx Unequal Modulation Supported" fields.
4083                  */
4084         }
4085
4086         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4087                 return chains;
4088
4089         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4090         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4091                 u8 nss;
4092                 u16 tx_mcs_map;
4093
4094                 vht_cap = (void *)(vht_cap_ie + 2);
4095                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4096                 for (nss = 8; nss > 0; nss--) {
4097                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4098                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4099                                 break;
4100                 }
4101                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4102                 chains = max(chains, nss);
4103         }
4104
4105         return chains;
4106 }
4107
4108 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4109                                   struct cfg80211_bss *cbss)
4110 {
4111         struct ieee80211_local *local = sdata->local;
4112         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4113         const struct ieee80211_ht_cap *ht_cap = NULL;
4114         const struct ieee80211_ht_operation *ht_oper = NULL;
4115         const struct ieee80211_vht_operation *vht_oper = NULL;
4116         struct ieee80211_supported_band *sband;
4117         struct cfg80211_chan_def chandef;
4118         int ret;
4119
4120         sband = local->hw.wiphy->bands[cbss->channel->band];
4121
4122         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4123                           IEEE80211_STA_DISABLE_80P80MHZ |
4124                           IEEE80211_STA_DISABLE_160MHZ);
4125
4126         rcu_read_lock();
4127
4128         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4129             sband->ht_cap.ht_supported) {
4130                 const u8 *ht_oper_ie, *ht_cap_ie;
4131
4132                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4133                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4134                         ht_oper = (void *)(ht_oper_ie + 2);
4135
4136                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4137                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4138                         ht_cap = (void *)(ht_cap_ie + 2);
4139
4140                 if (!ht_cap) {
4141                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4142                         ht_oper = NULL;
4143                 }
4144         }
4145
4146         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4147             sband->vht_cap.vht_supported) {
4148                 const u8 *vht_oper_ie, *vht_cap;
4149
4150                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4151                                                    WLAN_EID_VHT_OPERATION);
4152                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4153                         vht_oper = (void *)(vht_oper_ie + 2);
4154                 if (vht_oper && !ht_oper) {
4155                         vht_oper = NULL;
4156                         sdata_info(sdata,
4157                                    "AP advertised VHT without HT, disabling both\n");
4158                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4159                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4160                 }
4161
4162                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4163                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4164                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4165                         vht_oper = NULL;
4166                 }
4167         }
4168
4169         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4170                                                      cbss->channel,
4171                                                      ht_cap, ht_oper, vht_oper,
4172                                                      &chandef, false);
4173
4174         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4175                                       local->rx_chains);
4176
4177         rcu_read_unlock();
4178
4179         /* will change later if needed */
4180         sdata->smps_mode = IEEE80211_SMPS_OFF;
4181
4182         mutex_lock(&local->mtx);
4183         /*
4184          * If this fails (possibly due to channel context sharing
4185          * on incompatible channels, e.g. 80+80 and 160 sharing the
4186          * same control channel) try to use a smaller bandwidth.
4187          */
4188         ret = ieee80211_vif_use_channel(sdata, &chandef,
4189                                         IEEE80211_CHANCTX_SHARED);
4190
4191         /* don't downgrade for 5 and 10 MHz channels, though. */
4192         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4193             chandef.width == NL80211_CHAN_WIDTH_10)
4194                 goto out;
4195
4196         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4197                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4198                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4199                                                 IEEE80211_CHANCTX_SHARED);
4200         }
4201  out:
4202         mutex_unlock(&local->mtx);
4203         return ret;
4204 }
4205
4206 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4207                                      struct cfg80211_bss *cbss, bool assoc)
4208 {
4209         struct ieee80211_local *local = sdata->local;
4210         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4211         struct ieee80211_bss *bss = (void *)cbss->priv;
4212         struct sta_info *new_sta = NULL;
4213         struct ieee80211_supported_band *sband;
4214         struct ieee80211_sta_ht_cap sta_ht_cap;
4215         bool have_sta = false, is_override = false;
4216         int err;
4217
4218         sband = local->hw.wiphy->bands[cbss->channel->band];
4219
4220         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4221                 return -EINVAL;
4222
4223         if (assoc) {
4224                 rcu_read_lock();
4225                 have_sta = sta_info_get(sdata, cbss->bssid);
4226                 rcu_read_unlock();
4227         }
4228
4229         if (!have_sta) {
4230                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4231                 if (!new_sta)
4232                         return -ENOMEM;
4233         }
4234
4235         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4236         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4237
4238         is_override = (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) !=
4239                       (sband->ht_cap.cap &
4240                        IEEE80211_HT_CAP_SUP_WIDTH_20_40);
4241
4242         if (new_sta || is_override) {
4243                 err = ieee80211_prep_channel(sdata, cbss);
4244                 if (err) {
4245                         if (new_sta)
4246                                 sta_info_free(local, new_sta);
4247                         return -EINVAL;
4248                 }
4249         }
4250
4251         if (new_sta) {
4252                 u32 rates = 0, basic_rates = 0;
4253                 bool have_higher_than_11mbit;
4254                 int min_rate = INT_MAX, min_rate_index = -1;
4255                 struct ieee80211_chanctx_conf *chanctx_conf;
4256                 const struct cfg80211_bss_ies *ies;
4257                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4258                 u32 rate_flags;
4259
4260                 rcu_read_lock();
4261                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4262                 if (WARN_ON(!chanctx_conf)) {
4263                         rcu_read_unlock();
4264                         sta_info_free(local, new_sta);
4265                         return -EINVAL;
4266                 }
4267                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4268                 rcu_read_unlock();
4269
4270                 ieee80211_get_rates(sband, bss->supp_rates,
4271                                     bss->supp_rates_len,
4272                                     &rates, &basic_rates,
4273                                     &have_higher_than_11mbit,
4274                                     &min_rate, &min_rate_index,
4275                                     shift, rate_flags);
4276
4277                 /*
4278                  * This used to be a workaround for basic rates missing
4279                  * in the association response frame. Now that we no
4280                  * longer use the basic rates from there, it probably
4281                  * doesn't happen any more, but keep the workaround so
4282                  * in case some *other* APs are buggy in different ways
4283                  * we can connect -- with a warning.
4284                  */
4285                 if (!basic_rates && min_rate_index >= 0) {
4286                         sdata_info(sdata,
4287                                    "No basic rates, using min rate instead\n");
4288                         basic_rates = BIT(min_rate_index);
4289                 }
4290
4291                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4292                 sdata->vif.bss_conf.basic_rates = basic_rates;
4293
4294                 /* cf. IEEE 802.11 9.2.12 */
4295                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4296                     have_higher_than_11mbit)
4297                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4298                 else
4299                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4300
4301                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4302
4303                 /* set timing information */
4304                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4305                 rcu_read_lock();
4306                 ies = rcu_dereference(cbss->beacon_ies);
4307                 if (ies) {
4308                         const u8 *tim_ie;
4309
4310                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4311                         sdata->vif.bss_conf.sync_device_ts =
4312                                 bss->device_ts_beacon;
4313                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4314                                                   ies->data, ies->len);
4315                         if (tim_ie && tim_ie[1] >= 2)
4316                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4317                         else
4318                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4319                 } else if (!(local->hw.flags &
4320                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4321                         ies = rcu_dereference(cbss->proberesp_ies);
4322                         /* must be non-NULL since beacon IEs were NULL */
4323                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4324                         sdata->vif.bss_conf.sync_device_ts =
4325                                 bss->device_ts_presp;
4326                         sdata->vif.bss_conf.sync_dtim_count = 0;
4327                 } else {
4328                         sdata->vif.bss_conf.sync_tsf = 0;
4329                         sdata->vif.bss_conf.sync_device_ts = 0;
4330                         sdata->vif.bss_conf.sync_dtim_count = 0;
4331                 }
4332                 rcu_read_unlock();
4333
4334                 /* tell driver about BSSID, basic rates and timing */
4335                 ieee80211_bss_info_change_notify(sdata,
4336                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4337                         BSS_CHANGED_BEACON_INT);
4338
4339                 if (assoc)
4340                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4341
4342                 err = sta_info_insert(new_sta);
4343                 new_sta = NULL;
4344                 if (err) {
4345                         sdata_info(sdata,
4346                                    "failed to insert STA entry for the AP (error %d)\n",
4347                                    err);
4348                         return err;
4349                 }
4350         } else
4351                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4352
4353         return 0;
4354 }
4355
4356 /* config hooks */
4357 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4358                        struct cfg80211_auth_request *req)
4359 {
4360         struct ieee80211_local *local = sdata->local;
4361         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4362         struct ieee80211_mgd_auth_data *auth_data;
4363         u16 auth_alg;
4364         int err;
4365
4366         /* prepare auth data structure */
4367
4368         switch (req->auth_type) {
4369         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4370                 auth_alg = WLAN_AUTH_OPEN;
4371                 break;
4372         case NL80211_AUTHTYPE_SHARED_KEY:
4373                 if (IS_ERR(local->wep_tx_tfm))
4374                         return -EOPNOTSUPP;
4375                 auth_alg = WLAN_AUTH_SHARED_KEY;
4376                 break;
4377         case NL80211_AUTHTYPE_FT:
4378                 auth_alg = WLAN_AUTH_FT;
4379                 break;
4380         case NL80211_AUTHTYPE_NETWORK_EAP:
4381                 auth_alg = WLAN_AUTH_LEAP;
4382                 break;
4383         case NL80211_AUTHTYPE_SAE:
4384                 auth_alg = WLAN_AUTH_SAE;
4385                 break;
4386         default:
4387                 return -EOPNOTSUPP;
4388         }
4389
4390         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4391                             req->ie_len, GFP_KERNEL);
4392         if (!auth_data)
4393                 return -ENOMEM;
4394
4395         auth_data->bss = req->bss;
4396
4397         if (req->sae_data_len >= 4) {
4398                 __le16 *pos = (__le16 *) req->sae_data;
4399                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4400                 auth_data->sae_status = le16_to_cpu(pos[1]);
4401                 memcpy(auth_data->data, req->sae_data + 4,
4402                        req->sae_data_len - 4);
4403                 auth_data->data_len += req->sae_data_len - 4;
4404         }
4405
4406         if (req->ie && req->ie_len) {
4407                 memcpy(&auth_data->data[auth_data->data_len],
4408                        req->ie, req->ie_len);
4409                 auth_data->data_len += req->ie_len;
4410         }
4411
4412         if (req->key && req->key_len) {
4413                 auth_data->key_len = req->key_len;
4414                 auth_data->key_idx = req->key_idx;
4415                 memcpy(auth_data->key, req->key, req->key_len);
4416         }
4417
4418         auth_data->algorithm = auth_alg;
4419
4420         /* try to authenticate/probe */
4421
4422         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4423             ifmgd->assoc_data) {
4424                 err = -EBUSY;
4425                 goto err_free;
4426         }
4427
4428         if (ifmgd->auth_data)
4429                 ieee80211_destroy_auth_data(sdata, false);
4430
4431         /* prep auth_data so we don't go into idle on disassoc */
4432         ifmgd->auth_data = auth_data;
4433
4434         if (ifmgd->associated) {
4435                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4436
4437                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4438                                        WLAN_REASON_UNSPECIFIED,
4439                                        false, frame_buf);
4440
4441                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4442                                       sizeof(frame_buf));
4443         }
4444
4445         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4446
4447         err = ieee80211_prep_connection(sdata, req->bss, false);
4448         if (err)
4449                 goto err_clear;
4450
4451         err = ieee80211_probe_auth(sdata);
4452         if (err) {
4453                 sta_info_destroy_addr(sdata, req->bss->bssid);
4454                 goto err_clear;
4455         }
4456
4457         /* hold our own reference */
4458         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4459         return 0;
4460
4461  err_clear:
4462         memset(ifmgd->bssid, 0, ETH_ALEN);
4463         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4464         ifmgd->auth_data = NULL;
4465  err_free:
4466         kfree(auth_data);
4467         return err;
4468 }
4469
4470 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4471                                         const u8 *wmm_param, int len)
4472 {
4473         const u8 *pos;
4474         size_t left;
4475
4476         if (len < 8)
4477                 return false;
4478
4479         if (wmm_param[5] != 1 /* version */)
4480                 return false;
4481
4482         pos = wmm_param + 8;
4483         left = len - 8;
4484
4485         for (; left >= 4; left -= 4, pos += 4) {
4486                 u8 aifsn = pos[0] & 0x0f;
4487                 u8 ecwmin = pos[1] & 0x0f;
4488                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4489                 int aci = (pos[0] >> 5) & 0x03;
4490
4491                 if (aifsn < 2) {
4492                         sdata_info(sdata,
4493                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4494                                    aifsn, aci);
4495                         return false;
4496                 }
4497                 if (ecwmin > ecwmax) {
4498                         sdata_info(sdata,
4499                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4500                                    ecwmin, ecwmax, aci);
4501                         return false;
4502                 }
4503         }
4504
4505         return true;
4506 }
4507
4508 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4509                         struct cfg80211_assoc_request *req)
4510 {
4511         struct ieee80211_local *local = sdata->local;
4512         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4513         struct ieee80211_bss *bss = (void *)req->bss->priv;
4514         struct ieee80211_mgd_assoc_data *assoc_data;
4515         const struct cfg80211_bss_ies *beacon_ies;
4516         struct ieee80211_supported_band *sband;
4517         const u8 *ssidie, *ht_ie, *vht_ie;
4518         int i, err;
4519
4520         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4521         if (!assoc_data)
4522                 return -ENOMEM;
4523
4524         rcu_read_lock();
4525         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4526         if (!ssidie) {
4527                 rcu_read_unlock();
4528                 kfree(assoc_data);
4529                 return -EINVAL;
4530         }
4531         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4532         assoc_data->ssid_len = ssidie[1];
4533         rcu_read_unlock();
4534
4535         if (ifmgd->associated) {
4536                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4537
4538                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4539                                        WLAN_REASON_UNSPECIFIED,
4540                                        false, frame_buf);
4541
4542                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4543                                       sizeof(frame_buf));
4544         }
4545
4546         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4547                 err = -EBUSY;
4548                 goto err_free;
4549         }
4550
4551         if (ifmgd->assoc_data) {
4552                 err = -EBUSY;
4553                 goto err_free;
4554         }
4555
4556         if (ifmgd->auth_data) {
4557                 bool match;
4558
4559                 /* keep sta info, bssid if matching */
4560                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4561                 ieee80211_destroy_auth_data(sdata, match);
4562         }
4563
4564         /* prepare assoc data */
4565
4566         ifmgd->beacon_crc_valid = false;
4567
4568         assoc_data->wmm = bss->wmm_used &&
4569                           (local->hw.queues >= IEEE80211_NUM_ACS);
4570         if (assoc_data->wmm) {
4571                 /* try to check validity of WMM params IE */
4572                 const struct cfg80211_bss_ies *ies;
4573                 const u8 *wp, *start, *end;
4574
4575                 rcu_read_lock();
4576                 ies = rcu_dereference(req->bss->ies);
4577                 start = ies->data;
4578                 end = start + ies->len;
4579
4580                 while (true) {
4581                         wp = cfg80211_find_vendor_ie(
4582                                 WLAN_OUI_MICROSOFT,
4583                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4584                                 start, end - start);
4585                         if (!wp)
4586                                 break;
4587                         start = wp + wp[1] + 2;
4588                         /* if this IE is too short, try the next */
4589                         if (wp[1] <= 4)
4590                                 continue;
4591                         /* if this IE is WMM params, we found what we wanted */
4592                         if (wp[6] == 1)
4593                                 break;
4594                 }
4595
4596                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4597                                                         wp[1] - 2)) {
4598                         assoc_data->wmm = false;
4599                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4600                 }
4601                 rcu_read_unlock();
4602         }
4603
4604         /*
4605          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4606          * We still associate in non-HT mode (11a/b/g) if any one of these
4607          * ciphers is configured as pairwise.
4608          * We can set this to true for non-11n hardware, that'll be checked
4609          * separately along with the peer capabilities.
4610          */
4611         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4612                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4613                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4614                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4615                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4616                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4617                         netdev_info(sdata->dev,
4618                                     "disabling HT/VHT due to WEP/TKIP use\n");
4619                 }
4620         }
4621
4622         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4623                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4624                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4625         }
4626
4627         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4628                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4629
4630         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4631         sband = local->hw.wiphy->bands[req->bss->channel->band];
4632         if (!sband->ht_cap.ht_supported ||
4633             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4634             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4635                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4636                 if (!bss->wmm_used &&
4637                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4638                         netdev_info(sdata->dev,
4639                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4640         }
4641
4642         /* disable VHT if we don't support it or the AP doesn't use WMM */
4643         if (!sband->vht_cap.vht_supported ||
4644             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4645             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4646                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4647                 if (!bss->wmm_used &&
4648                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4649                         netdev_info(sdata->dev,
4650                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4651         }
4652
4653         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4654         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4655                sizeof(ifmgd->ht_capa_mask));
4656
4657         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4658         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4659                sizeof(ifmgd->vht_capa_mask));
4660
4661         if (req->ie && req->ie_len) {
4662                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4663                 assoc_data->ie_len = req->ie_len;
4664         }
4665
4666         assoc_data->bss = req->bss;
4667
4668         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4669                 if (ifmgd->powersave)
4670                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4671                 else
4672                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4673         } else
4674                 sdata->smps_mode = ifmgd->req_smps;
4675
4676         assoc_data->capability = req->bss->capability;
4677         assoc_data->supp_rates = bss->supp_rates;
4678         assoc_data->supp_rates_len = bss->supp_rates_len;
4679
4680         rcu_read_lock();
4681         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4682         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4683                 assoc_data->ap_ht_param =
4684                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4685         else
4686                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4687         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4688         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4689                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4690                        sizeof(struct ieee80211_vht_cap));
4691         else
4692                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4693         rcu_read_unlock();
4694
4695         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4696                  (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
4697              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4698                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4699
4700         if (bss->wmm_used && bss->uapsd_supported &&
4701             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4702                 assoc_data->uapsd = true;
4703                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4704         } else {
4705                 assoc_data->uapsd = false;
4706                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4707         }
4708
4709         if (req->prev_bssid)
4710                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4711
4712         if (req->use_mfp) {
4713                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4714                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4715         } else {
4716                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4717                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4718         }
4719
4720         if (req->flags & ASSOC_REQ_USE_RRM)
4721                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4722         else
4723                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4724
4725         if (req->crypto.control_port)
4726                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4727         else
4728                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4729
4730         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4731         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4732         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4733                                                         sdata->vif.type);
4734
4735         /* kick off associate process */
4736
4737         ifmgd->assoc_data = assoc_data;
4738         ifmgd->dtim_period = 0;
4739         ifmgd->have_beacon = false;
4740
4741         err = ieee80211_prep_connection(sdata, req->bss, true);
4742         if (err)
4743                 goto err_clear;
4744
4745         rcu_read_lock();
4746         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4747
4748         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4749             !beacon_ies) {
4750                 /*
4751                  * Wait up to one beacon interval ...
4752                  * should this be more if we miss one?
4753                  */
4754                 sdata_info(sdata, "waiting for beacon from %pM\n",
4755                            ifmgd->bssid);
4756                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4757                 assoc_data->timeout_started = true;
4758                 assoc_data->need_beacon = true;
4759         } else if (beacon_ies) {
4760                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4761                                                     beacon_ies->data,
4762                                                     beacon_ies->len);
4763                 u8 dtim_count = 0;
4764
4765                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4766                         const struct ieee80211_tim_ie *tim;
4767                         tim = (void *)(tim_ie + 2);
4768                         ifmgd->dtim_period = tim->dtim_period;
4769                         dtim_count = tim->dtim_count;
4770                 }
4771                 ifmgd->have_beacon = true;
4772                 assoc_data->timeout = jiffies;
4773                 assoc_data->timeout_started = true;
4774
4775                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4776                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4777                         sdata->vif.bss_conf.sync_device_ts =
4778                                 bss->device_ts_beacon;
4779                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4780                 }
4781         } else {
4782                 assoc_data->timeout = jiffies;
4783                 assoc_data->timeout_started = true;
4784         }
4785         rcu_read_unlock();
4786
4787         run_again(sdata, assoc_data->timeout);
4788
4789         if (bss->corrupt_data) {
4790                 char *corrupt_type = "data";
4791                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4792                         if (bss->corrupt_data &
4793                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4794                                 corrupt_type = "beacon and probe response";
4795                         else
4796                                 corrupt_type = "beacon";
4797                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4798                         corrupt_type = "probe response";
4799                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4800                            corrupt_type);
4801         }
4802
4803         return 0;
4804  err_clear:
4805         memset(ifmgd->bssid, 0, ETH_ALEN);
4806         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4807         ifmgd->assoc_data = NULL;
4808  err_free:
4809         kfree(assoc_data);
4810         return err;
4811 }
4812
4813 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4814                          struct cfg80211_deauth_request *req)
4815 {
4816         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4817         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4818         bool tx = !req->local_state_change;
4819
4820         if (ifmgd->auth_data &&
4821             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4822                 sdata_info(sdata,
4823                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4824                            req->bssid, req->reason_code,
4825                            ieee80211_get_reason_code_string(req->reason_code));
4826
4827                 drv_mgd_prepare_tx(sdata->local, sdata);
4828                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4829                                                IEEE80211_STYPE_DEAUTH,
4830                                                req->reason_code, tx,
4831                                                frame_buf);
4832                 ieee80211_destroy_auth_data(sdata, false);
4833                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4834                                       IEEE80211_DEAUTH_FRAME_LEN);
4835
4836                 return 0;
4837         }
4838
4839         if (ifmgd->associated &&
4840             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4841                 sdata_info(sdata,
4842                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4843                            req->bssid, req->reason_code,
4844                            ieee80211_get_reason_code_string(req->reason_code));
4845
4846                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4847                                        req->reason_code, tx, frame_buf);
4848                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4849                                       IEEE80211_DEAUTH_FRAME_LEN);
4850                 return 0;
4851         }
4852
4853         return -ENOTCONN;
4854 }
4855
4856 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4857                            struct cfg80211_disassoc_request *req)
4858 {
4859         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4860         u8 bssid[ETH_ALEN];
4861         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4862
4863         /*
4864          * cfg80211 should catch this ... but it's racy since
4865          * we can receive a disassoc frame, process it, hand it
4866          * to cfg80211 while that's in a locked section already
4867          * trying to tell us that the user wants to disconnect.
4868          */
4869         if (ifmgd->associated != req->bss)
4870                 return -ENOLINK;
4871
4872         sdata_info(sdata,
4873                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4874                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4875
4876         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4877         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4878                                req->reason_code, !req->local_state_change,
4879                                frame_buf);
4880
4881         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4882                               IEEE80211_DEAUTH_FRAME_LEN);
4883
4884         return 0;
4885 }
4886
4887 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4888 {
4889         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4890
4891         /*
4892          * Make sure some work items will not run after this,
4893          * they will not do anything but might not have been
4894          * cancelled when disconnecting.
4895          */
4896         cancel_work_sync(&ifmgd->monitor_work);
4897         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4898         cancel_work_sync(&ifmgd->request_smps_work);
4899         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4900         cancel_work_sync(&ifmgd->chswitch_work);
4901         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4902
4903         sdata_lock(sdata);
4904         if (ifmgd->assoc_data) {
4905                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4906                 ieee80211_destroy_assoc_data(sdata, false);
4907                 cfg80211_assoc_timeout(sdata->dev, bss);
4908         }
4909         if (ifmgd->auth_data)
4910                 ieee80211_destroy_auth_data(sdata, false);
4911         spin_lock_bh(&ifmgd->teardown_lock);
4912         if (ifmgd->teardown_skb) {
4913                 kfree_skb(ifmgd->teardown_skb);
4914                 ifmgd->teardown_skb = NULL;
4915                 ifmgd->orig_teardown_skb = NULL;
4916         }
4917         spin_unlock_bh(&ifmgd->teardown_lock);
4918         del_timer_sync(&ifmgd->timer);
4919         sdata_unlock(sdata);
4920 }
4921
4922 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4923                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4924                                gfp_t gfp)
4925 {
4926         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4927
4928         trace_api_cqm_rssi_notify(sdata, rssi_event);
4929
4930         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4931 }
4932 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
4933
4934 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
4935 {
4936         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4937
4938         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
4939
4940         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
4941 }
4942 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);