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         u32 ht_cfreq, ret;
 161
 162         chandef->chan = channel;
 163         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 164         chandef->center_freq1 = channel->center_freq;
 165         chandef->center_freq2 = 0;
 166
 167         if (!ht_cap || !ht_oper || !sband->ht_cap.ht_supported) {
 168                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 169                 goto out;
 170         }
 171
 172         chandef->width = NL80211_CHAN_WIDTH_20;
 173
 174         if (!(ht_cap->cap_info &
 175               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 176                 ret = IEEE80211_STA_DISABLE_40MHZ;
 177                 vht_chandef = *chandef;
 178                 goto out;
 179         }
 180
 181         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 182                                                   channel->band);
 183         /* check that channel matches the right operating channel */
 184         if (!tracking && channel->center_freq != ht_cfreq) {
 185                 /*
 186                  * It's possible that some APs are confused here;
 187                  * Netgear WNDR3700 sometimes reports 4 higher than
 188                  * the actual channel in association responses, but
 189                  * since we look at probe response/beacon data here
 190                  * it should be OK.
 191                  */
 192                 sdata_info(sdata,
 193                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 194                            channel->center_freq, ht_cfreq,
 195                            ht_oper->primary_chan, channel->band);
 196                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 197                 goto out;
 198         }
 199
 200         /* check 40 MHz support, if we have it */
 201         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 202                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 203                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 204                         chandef->width = NL80211_CHAN_WIDTH_40;
 205                         chandef->center_freq1 += 10;
 206                         break;
 207                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 208                         chandef->width = NL80211_CHAN_WIDTH_40;
 209                         chandef->center_freq1 -= 10;
 210                         break;
 211                 }
 212         } else {
 213                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 214                 ret = IEEE80211_STA_DISABLE_VHT;
 215                 /* also mark 40 MHz disabled */
 216                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 217                 goto out;
 218         }
 219
 220         if (!vht_oper || !sband->vht_cap.vht_supported) {
 221                 ret = IEEE80211_STA_DISABLE_VHT;
 222                 goto out;
 223         }
 224
 225         vht_chandef.chan = channel;
 226         vht_chandef.center_freq1 =
 227                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 228                                                channel->band);
 229         vht_chandef.center_freq2 = 0;
 230
 231         switch (vht_oper->chan_width) {
 232         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 233                 vht_chandef.width = chandef->width;
 234                 vht_chandef.center_freq1 = chandef->center_freq1;
 235                 break;
 236         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 237                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 238                 break;
 239         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 240                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 241                 break;
 242         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 243                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 244                 vht_chandef.center_freq2 =
 245                         ieee80211_channel_to_frequency(
 246                                 vht_oper->center_freq_seg2_idx,
 247                                 channel->band);
 248                 break;
 249         default:
 250                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 251                         sdata_info(sdata,
 252                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 253                                    vht_oper->chan_width);
 254                 ret = IEEE80211_STA_DISABLE_VHT;
 255                 goto out;
 256         }
 257
 258         if (!cfg80211_chandef_valid(&vht_chandef)) {
 259                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 260                         sdata_info(sdata,
 261                                    "AP VHT information is invalid, disable VHT\n");
 262                 ret = IEEE80211_STA_DISABLE_VHT;
 263                 goto out;
 264         }
 265
 266         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 267                 ret = 0;
 268                 goto out;
 269         }
 270
 271         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 272                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 273                         sdata_info(sdata,
 274                                    "AP VHT information doesn't match HT, disable VHT\n");
 275                 ret = IEEE80211_STA_DISABLE_VHT;
 276                 goto out;
 277         }
 278
 279         *chandef = vht_chandef;
 280
 281         ret = 0;
 282
 283 out:
 284         /*
 285          * When tracking the current AP, don't do any further checks if the
 286          * new chandef is identical to the one we're currently using for the
 287          * connection. This keeps us from playing ping-pong with regulatory,
 288          * without it the following can happen (for example):
 289          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 290          *  - AP advertises regdom US
 291          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 292          *  - the code below detects an unsupported channel, downgrades, and
 293          *    we disconnect from the AP in the caller
 294          *  - disconnect causes CRDA to reload world regdomain and the game
 295          *    starts anew.
 296          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 297          *
 298          * It seems possible that there are still scenarios with CSA or real
 299          * bandwidth changes where a this could happen, but those cases are
 300          * less common and wouldn't completely prevent using the AP.
 301          */
 302         if (tracking &&
 303             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 304                 return ret;
 305
 306         /* don't print the message below for VHT mismatch if VHT is disabled */
 307         if (ret & IEEE80211_STA_DISABLE_VHT)
 308                 vht_chandef = *chandef;
 309
 310         /*
 311          * Ignore the DISABLED flag when we're already connected and only
 312          * tracking the APs beacon for bandwidth changes - otherwise we
 313          * might get disconnected here if we connect to an AP, update our
 314          * regulatory information based on the AP's country IE and the
 315          * information we have is wrong/outdated and disables the channel
 316          * that we're actually using for the connection to the AP.
 317          */
 318         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 319                                         tracking ? 0 :
 320                                                    IEEE80211_CHAN_DISABLED)) {
 321                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 322                         ret = IEEE80211_STA_DISABLE_HT |
 323                               IEEE80211_STA_DISABLE_VHT;
 324                         break;
 325                 }
 326
 327                 ret |= ieee80211_chandef_downgrade(chandef);
 328         }
 329
 330         if (chandef->width != vht_chandef.width && !tracking)
 331                 sdata_info(sdata,
 332                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 333
 334         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 335         return ret;
 336 }
 337
 338 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 339                                struct sta_info *sta,
 340                                const struct ieee80211_ht_cap *ht_cap,
 341                                const struct ieee80211_ht_operation *ht_oper,
 342                                const struct ieee80211_vht_operation *vht_oper,
 343                                const u8 *bssid, u32 *changed)
 344 {
 345         struct ieee80211_local *local = sdata->local;
 346         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 347         struct ieee80211_supported_band *sband;
 348         struct ieee80211_channel *chan;
 349         struct cfg80211_chan_def chandef;
 350         u16 ht_opmode;
 351         u32 flags;
 352         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 353         int ret;
 354
 355         /* if HT was/is disabled, don't track any bandwidth changes */
 356         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 357                 return 0;
 358
 359         /* don't check VHT if we associated as non-VHT station */
 360         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 361                 vht_oper = NULL;
 362
 363         if (WARN_ON_ONCE(!sta))
 364                 return -EINVAL;
 365
 366         /*
 367          * if bss configuration changed store the new one -
 368          * this may be applicable even if channel is identical
 369          */
 370         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 371         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 372                 *changed |= BSS_CHANGED_HT;
 373                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 374         }
 375
 376         chan = sdata->vif.bss_conf.chandef.chan;
 377         sband = local->hw.wiphy->bands[chan->band];
 378
 379         /* calculate new channel (type) based on HT/VHT operation IEs */
 380         flags = ieee80211_determine_chantype(sdata, sband, chan,
 381                                              ht_cap, ht_oper, vht_oper,
 382                                              &chandef, true);
 383
 384         /*
 385          * Downgrade the new channel if we associated with restricted
 386          * capabilities. For example, if we associated as a 20 MHz STA
 387          * to a 40 MHz AP (due to regulatory, capabilities or config
 388          * reasons) then switching to a 40 MHz channel now won't do us
 389          * any good -- we couldn't use it with the AP.
 390          */
 391         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 392             chandef.width == NL80211_CHAN_WIDTH_80P80)
 393                 flags |= ieee80211_chandef_downgrade(&chandef);
 394         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 395             chandef.width == NL80211_CHAN_WIDTH_160)
 396                 flags |= ieee80211_chandef_downgrade(&chandef);
 397         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 398             chandef.width > NL80211_CHAN_WIDTH_20)
 399                 flags |= ieee80211_chandef_downgrade(&chandef);
 400
 401         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 402                 return 0;
 403
 404         sdata_info(sdata,
 405                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 406                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 407                    chandef.center_freq1, chandef.center_freq2);
 408
 409         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 410                                       IEEE80211_STA_DISABLE_VHT |
 411                                       IEEE80211_STA_DISABLE_40MHZ |
 412                                       IEEE80211_STA_DISABLE_80P80MHZ |
 413                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 414             !cfg80211_chandef_valid(&chandef)) {
 415                 sdata_info(sdata,
 416                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 417                            ifmgd->bssid);
 418                 return -EINVAL;
 419         }
 420
 421         switch (chandef.width) {
 422         case NL80211_CHAN_WIDTH_20_NOHT:
 423         case NL80211_CHAN_WIDTH_20:
 424                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 425                 break;
 426         case NL80211_CHAN_WIDTH_40:
 427                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 428                 break;
 429         case NL80211_CHAN_WIDTH_80:
 430                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 431                 break;
 432         case NL80211_CHAN_WIDTH_80P80:
 433         case NL80211_CHAN_WIDTH_160:
 434                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 435                 break;
 436         default:
 437                 return -EINVAL;
 438         }
 439
 440         if (new_sta_bw > sta->cur_max_bandwidth)
 441                 new_sta_bw = sta->cur_max_bandwidth;
 442
 443         if (new_sta_bw < sta->sta.bandwidth) {
 444                 sta->sta.bandwidth = new_sta_bw;
 445                 rate_control_rate_update(local, sband, sta,
 446                                          IEEE80211_RC_BW_CHANGED);
 447         }
 448
 449         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 450         if (ret) {
 451                 sdata_info(sdata,
 452                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 453                            ifmgd->bssid);
 454                 return ret;
 455         }
 456
 457         if (new_sta_bw > sta->sta.bandwidth) {
 458                 sta->sta.bandwidth = new_sta_bw;
 459                 rate_control_rate_update(local, sband, sta,
 460                                          IEEE80211_RC_BW_CHANGED);
 461         }
 462
 463         return 0;
 464 }
 465
 466 /* frame sending functions */
 467
 468 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 469                                 struct sk_buff *skb, u8 ap_ht_param,
 470                                 struct ieee80211_supported_band *sband,
 471                                 struct ieee80211_channel *channel,
 472                                 enum ieee80211_smps_mode smps)
 473 {
 474         u8 *pos;
 475         u32 flags = channel->flags;
 476         u16 cap;
 477         struct ieee80211_sta_ht_cap ht_cap;
 478
 479         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 480
 481         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 482         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 483
 484         /* determine capability flags */
 485         cap = ht_cap.cap;
 486
 487         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 488         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 489                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 490                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 491                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 492                 }
 493                 break;
 494         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 495                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 496                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 497                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 498                 }
 499                 break;
 500         }
 501
 502         /*
 503          * If 40 MHz was disabled associate as though we weren't
 504          * capable of 40 MHz -- some broken APs will never fall
 505          * back to trying to transmit in 20 MHz.
 506          */
 507         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 508                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 509                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 510         }
 511
 512         /* set SM PS mode properly */
 513         cap &= ~IEEE80211_HT_CAP_SM_PS;
 514         switch (smps) {
 515         case IEEE80211_SMPS_AUTOMATIC:
 516         case IEEE80211_SMPS_NUM_MODES:
 517                 WARN_ON(1);
 518         case IEEE80211_SMPS_OFF:
 519                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 520                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 521                 break;
 522         case IEEE80211_SMPS_STATIC:
 523                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 524                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 525                 break;
 526         case IEEE80211_SMPS_DYNAMIC:
 527                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 528                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 529                 break;
 530         }
 531
 532         /* reserve and fill IE */
 533         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 534         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 535 }
 536
 537 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 538                                  struct sk_buff *skb,
 539                                  struct ieee80211_supported_band *sband,
 540                                  struct ieee80211_vht_cap *ap_vht_cap)
 541 {
 542         u8 *pos;
 543         u32 cap;
 544         struct ieee80211_sta_vht_cap vht_cap;
 545         u32 mask, ap_bf_sts, our_bf_sts;
 546
 547         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 548
 549         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 550         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 551
 552         /* determine capability flags */
 553         cap = vht_cap.cap;
 554
 555         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 556                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 557
 558                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 559                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 560                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 561                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 562         }
 563
 564         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 565                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 566                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 567         }
 568
 569         /*
 570          * Some APs apparently get confused if our capabilities are better
 571          * than theirs, so restrict what we advertise in the assoc request.
 572          */
 573         if (!(ap_vht_cap->vht_cap_info &
 574                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 575                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 576
 577         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 578
 579         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 580         our_bf_sts = cap & mask;
 581
 582         if (ap_bf_sts < our_bf_sts) {
 583                 cap &= ~mask;
 584                 cap |= ap_bf_sts;
 585         }
 586
 587         /* reserve and fill IE */
 588         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 589         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 590 }
 591
 592 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 593 {
 594         struct ieee80211_local *local = sdata->local;
 595         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 596         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 597         struct sk_buff *skb;
 598         struct ieee80211_mgmt *mgmt;
 599         u8 *pos, qos_info;
 600         size_t offset = 0, noffset;
 601         int i, count, rates_len, supp_rates_len, shift;
 602         u16 capab;
 603         struct ieee80211_supported_band *sband;
 604         struct ieee80211_chanctx_conf *chanctx_conf;
 605         struct ieee80211_channel *chan;
 606         u32 rate_flags, rates = 0;
 607
 608         sdata_assert_lock(sdata);
 609
 610         rcu_read_lock();
 611         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 612         if (WARN_ON(!chanctx_conf)) {
 613                 rcu_read_unlock();
 614                 return;
 615         }
 616         chan = chanctx_conf->def.chan;
 617         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 618         rcu_read_unlock();
 619         sband = local->hw.wiphy->bands[chan->band];
 620         shift = ieee80211_vif_get_shift(&sdata->vif);
 621
 622         if (assoc_data->supp_rates_len) {
 623                 /*
 624                  * Get all rates supported by the device and the AP as
 625                  * some APs don't like getting a superset of their rates
 626                  * in the association request (e.g. D-Link DAP 1353 in
 627                  * b-only mode)...
 628                  */
 629                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 630                                                      assoc_data->supp_rates,
 631                                                      assoc_data->supp_rates_len,
 632                                                      &rates);
 633         } else {
 634                 /*
 635                  * In case AP not provide any supported rates information
 636                  * before association, we send information element(s) with
 637                  * all rates that we support.
 638                  */
 639                 rates_len = 0;
 640                 for (i = 0; i < sband->n_bitrates; i++) {
 641                         if ((rate_flags & sband->bitrates[i].flags)
 642                             != rate_flags)
 643                                 continue;
 644                         rates |= BIT(i);
 645                         rates_len++;
 646                 }
 647         }
 648
 649         skb = alloc_skb(local->hw.extra_tx_headroom +
 650                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 651                         2 + assoc_data->ssid_len + /* SSID */
 652                         4 + rates_len + /* (extended) rates */
 653                         4 + /* power capability */
 654                         2 + 2 * sband->n_channels + /* supported channels */
 655                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 656                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 657                         assoc_data->ie_len + /* extra IEs */
 658                         9, /* WMM */
 659                         GFP_KERNEL);
 660         if (!skb)
 661                 return;
 662
 663         skb_reserve(skb, local->hw.extra_tx_headroom);
 664
 665         capab = WLAN_CAPABILITY_ESS;
 666
 667         if (sband->band == IEEE80211_BAND_2GHZ) {
 668                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 669                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 670                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 671                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 672         }
 673
 674         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 675                 capab |= WLAN_CAPABILITY_PRIVACY;
 676
 677         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 678             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 679                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 680
 681         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 682                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 683
 684         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 685         memset(mgmt, 0, 24);
 686         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 687         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 688         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 689
 690         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 691                 skb_put(skb, 10);
 692                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 693                                                   IEEE80211_STYPE_REASSOC_REQ);
 694                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 695                 mgmt->u.reassoc_req.listen_interval =
 696                                 cpu_to_le16(local->hw.conf.listen_interval);
 697                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 698                        ETH_ALEN);
 699         } else {
 700                 skb_put(skb, 4);
 701                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 702                                                   IEEE80211_STYPE_ASSOC_REQ);
 703                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 704                 mgmt->u.assoc_req.listen_interval =
 705                                 cpu_to_le16(local->hw.conf.listen_interval);
 706         }
 707
 708         /* SSID */
 709         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 710         *pos++ = WLAN_EID_SSID;
 711         *pos++ = assoc_data->ssid_len;
 712         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 713
 714         /* add all rates which were marked to be used above */
 715         supp_rates_len = rates_len;
 716         if (supp_rates_len > 8)
 717                 supp_rates_len = 8;
 718
 719         pos = skb_put(skb, supp_rates_len + 2);
 720         *pos++ = WLAN_EID_SUPP_RATES;
 721         *pos++ = supp_rates_len;
 722
 723         count = 0;
 724         for (i = 0; i < sband->n_bitrates; i++) {
 725                 if (BIT(i) & rates) {
 726                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 727                                                 5 * (1 << shift));
 728                         *pos++ = (u8) rate;
 729                         if (++count == 8)
 730                                 break;
 731                 }
 732         }
 733
 734         if (rates_len > count) {
 735                 pos = skb_put(skb, rates_len - count + 2);
 736                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 737                 *pos++ = rates_len - count;
 738
 739                 for (i++; i < sband->n_bitrates; i++) {
 740                         if (BIT(i) & rates) {
 741                                 int rate;
 742                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 743                                                     5 * (1 << shift));
 744                                 *pos++ = (u8) rate;
 745                         }
 746                 }
 747         }
 748
 749         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 750             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 751                 pos = skb_put(skb, 4);
 752                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 753                 *pos++ = 2;
 754                 *pos++ = 0; /* min tx power */
 755                  /* max tx power */
 756                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 757         }
 758
 759         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 760                 /* TODO: get this in reg domain format */
 761                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 762                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 763                 *pos++ = 2 * sband->n_channels;
 764                 for (i = 0; i < sband->n_channels; i++) {
 765                         *pos++ = ieee80211_frequency_to_channel(
 766                                         sband->channels[i].center_freq);
 767                         *pos++ = 1; /* one channel in the subband*/
 768                 }
 769         }
 770
 771         /* if present, add any custom IEs that go before HT */
 772         if (assoc_data->ie_len) {
 773                 static const u8 before_ht[] = {
 774                         WLAN_EID_SSID,
 775                         WLAN_EID_SUPP_RATES,
 776                         WLAN_EID_EXT_SUPP_RATES,
 777                         WLAN_EID_PWR_CAPABILITY,
 778                         WLAN_EID_SUPPORTED_CHANNELS,
 779                         WLAN_EID_RSN,
 780                         WLAN_EID_QOS_CAPA,
 781                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 782                         WLAN_EID_MOBILITY_DOMAIN,
 783                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 784                         WLAN_EID_RIC_DATA,              /* reassoc only */
 785                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 786                 };
 787                 static const u8 after_ric[] = {
 788                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 789                         WLAN_EID_HT_CAPABILITY,
 790                         WLAN_EID_BSS_COEX_2040,
 791                         WLAN_EID_EXT_CAPABILITY,
 792                         WLAN_EID_QOS_TRAFFIC_CAPA,
 793                         WLAN_EID_TIM_BCAST_REQ,
 794                         WLAN_EID_INTERWORKING,
 795                         /* 60GHz doesn't happen right now */
 796                         WLAN_EID_VHT_CAPABILITY,
 797                         WLAN_EID_OPMODE_NOTIF,
 798                 };
 799
 800                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 801                                                  assoc_data->ie_len,
 802                                                  before_ht,
 803                                                  ARRAY_SIZE(before_ht),
 804                                                  after_ric,
 805                                                  ARRAY_SIZE(after_ric),
 806                                                  offset);
 807                 pos = skb_put(skb, noffset - offset);
 808                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 809                 offset = noffset;
 810         }
 811
 812         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 813                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 814                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 815
 816         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 817                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 818                                     sband, chan, sdata->smps_mode);
 819
 820         /* if present, add any custom IEs that go before VHT */
 821         if (assoc_data->ie_len) {
 822                 static const u8 before_vht[] = {
 823                         WLAN_EID_SSID,
 824                         WLAN_EID_SUPP_RATES,
 825                         WLAN_EID_EXT_SUPP_RATES,
 826                         WLAN_EID_PWR_CAPABILITY,
 827                         WLAN_EID_SUPPORTED_CHANNELS,
 828                         WLAN_EID_RSN,
 829                         WLAN_EID_QOS_CAPA,
 830                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 831                         WLAN_EID_MOBILITY_DOMAIN,
 832                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 833                         WLAN_EID_HT_CAPABILITY,
 834                         WLAN_EID_BSS_COEX_2040,
 835                         WLAN_EID_EXT_CAPABILITY,
 836                         WLAN_EID_QOS_TRAFFIC_CAPA,
 837                         WLAN_EID_TIM_BCAST_REQ,
 838                         WLAN_EID_INTERWORKING,
 839                 };
 840
 841                 /* RIC already taken above, so no need to handle here anymore */
 842                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 843                                              before_vht, ARRAY_SIZE(before_vht),
 844                                              offset);
 845                 pos = skb_put(skb, noffset - offset);
 846                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 847                 offset = noffset;
 848         }
 849
 850         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 851                 ieee80211_add_vht_ie(sdata, skb, sband,
 852                                      &assoc_data->ap_vht_cap);
 853
 854         /* if present, add any custom non-vendor IEs that go after HT */
 855         if (assoc_data->ie_len) {
 856                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 857                                                     assoc_data->ie_len,
 858                                                     offset);
 859                 pos = skb_put(skb, noffset - offset);
 860                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 861                 offset = noffset;
 862         }
 863
 864         if (assoc_data->wmm) {
 865                 if (assoc_data->uapsd) {
 866                         qos_info = ifmgd->uapsd_queues;
 867                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 868                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 869                 } else {
 870                         qos_info = 0;
 871                 }
 872
 873                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 874         }
 875
 876         /* add any remaining custom (i.e. vendor specific here) IEs */
 877         if (assoc_data->ie_len) {
 878                 noffset = assoc_data->ie_len;
 879                 pos = skb_put(skb, noffset - offset);
 880                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 881         }
 882
 883         drv_mgd_prepare_tx(local, sdata);
 884
 885         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 886         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 887                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 888                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 889         ieee80211_tx_skb(sdata, skb);
 890 }
 891
 892 void ieee80211_send_pspoll(struct ieee80211_local *local,
 893                            struct ieee80211_sub_if_data *sdata)
 894 {
 895         struct ieee80211_pspoll *pspoll;
 896         struct sk_buff *skb;
 897
 898         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 899         if (!skb)
 900                 return;
 901
 902         pspoll = (struct ieee80211_pspoll *) skb->data;
 903         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 904
 905         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 906         ieee80211_tx_skb(sdata, skb);
 907 }
 908
 909 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 910                              struct ieee80211_sub_if_data *sdata,
 911                              int powersave)
 912 {
 913         struct sk_buff *skb;
 914         struct ieee80211_hdr_3addr *nullfunc;
 915         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 916
 917         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 918         if (!skb)
 919                 return;
 920
 921         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 922         if (powersave)
 923                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 924
 925         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 926                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 927
 928         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 929                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 930
 931         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 932                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 933
 934         ieee80211_tx_skb(sdata, skb);
 935 }
 936
 937 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 938                                           struct ieee80211_sub_if_data *sdata)
 939 {
 940         struct sk_buff *skb;
 941         struct ieee80211_hdr *nullfunc;
 942         __le16 fc;
 943
 944         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 945                 return;
 946
 947         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 948         if (!skb)
 949                 return;
 950
 951         skb_reserve(skb, local->hw.extra_tx_headroom);
 952
 953         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 954         memset(nullfunc, 0, 30);
 955         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 956                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 957         nullfunc->frame_control = fc;
 958         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 959         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 960         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 961         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 962
 963         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 964         ieee80211_tx_skb(sdata, skb);
 965 }
 966
 967 /* spectrum management related things */
 968 static void ieee80211_chswitch_work(struct work_struct *work)
 969 {
 970         struct ieee80211_sub_if_data *sdata =
 971                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 972         struct ieee80211_local *local = sdata->local;
 973         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 974         int ret;
 975
 976         if (!ieee80211_sdata_running(sdata))
 977                 return;
 978
 979         sdata_lock(sdata);
 980         mutex_lock(&local->mtx);
 981         mutex_lock(&local->chanctx_mtx);
 982
 983         if (!ifmgd->associated)
 984                 goto out;
 985
 986         if (!sdata->vif.csa_active)
 987                 goto out;
 988
 989         /*
 990          * using reservation isn't immediate as it may be deferred until later
 991          * with multi-vif. once reservation is complete it will re-schedule the
 992          * work with no reserved_chanctx so verify chandef to check if it
 993          * completed successfully
 994          */
 995
 996         if (sdata->reserved_chanctx) {
 997                 /*
 998                  * with multi-vif csa driver may call ieee80211_csa_finish()
 999                  * many times while waiting for other interfaces to use their
1000                  * reservations
1001                  */
1002                 if (sdata->reserved_ready)
1003                         goto out;
1004
1005                 ret = ieee80211_vif_use_reserved_context(sdata);
1006                 if (ret) {
1007                         sdata_info(sdata,
1008                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1009                                    ret);
1010                         ieee80211_queue_work(&sdata->local->hw,
1011                                              &ifmgd->csa_connection_drop_work);
1012                         goto out;
1013                 }
1014
1015                 goto out;
1016         }
1017
1018         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1019                                         &sdata->csa_chandef)) {
1020                 sdata_info(sdata,
1021                            "failed to finalize channel switch, disconnecting\n");
1022                 ieee80211_queue_work(&sdata->local->hw,
1023                                      &ifmgd->csa_connection_drop_work);
1024                 goto out;
1025         }
1026
1027         /* XXX: shouldn't really modify cfg80211-owned data! */
1028         ifmgd->associated->channel = sdata->csa_chandef.chan;
1029
1030         ifmgd->csa_waiting_bcn = true;
1031
1032         ieee80211_sta_reset_beacon_monitor(sdata);
1033         ieee80211_sta_reset_conn_monitor(sdata);
1034
1035 out:
1036         mutex_unlock(&local->chanctx_mtx);
1037         mutex_unlock(&local->mtx);
1038         sdata_unlock(sdata);
1039 }
1040
1041 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1042 {
1043         struct ieee80211_local *local = sdata->local;
1044         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1045         int ret;
1046
1047         sdata_assert_lock(sdata);
1048
1049         WARN_ON(!sdata->vif.csa_active);
1050
1051         if (sdata->csa_block_tx) {
1052                 ieee80211_wake_vif_queues(local, sdata,
1053                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1054                 sdata->csa_block_tx = false;
1055         }
1056
1057         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1058
1059         sdata->vif.csa_active = false;
1060         ifmgd->csa_waiting_bcn = false;
1061
1062         ret = drv_post_channel_switch(sdata);
1063         if (ret) {
1064                 sdata_info(sdata,
1065                            "driver post channel switch failed, disconnecting\n");
1066                 ieee80211_queue_work(&local->hw,
1067                                      &ifmgd->csa_connection_drop_work);
1068                 return;
1069         }
1070 }
1071
1072 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1073 {
1074         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1075         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1076
1077         trace_api_chswitch_done(sdata, success);
1078         if (!success) {
1079                 sdata_info(sdata,
1080                            "driver channel switch failed, disconnecting\n");
1081                 ieee80211_queue_work(&sdata->local->hw,
1082                                      &ifmgd->csa_connection_drop_work);
1083         } else {
1084                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1085         }
1086 }
1087 EXPORT_SYMBOL(ieee80211_chswitch_done);
1088
1089 static void ieee80211_chswitch_timer(unsigned long data)
1090 {
1091         struct ieee80211_sub_if_data *sdata =
1092                 (struct ieee80211_sub_if_data *) data;
1093
1094         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1095 }
1096
1097 static void
1098 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1099                                  u64 timestamp, u32 device_timestamp,
1100                                  struct ieee802_11_elems *elems,
1101                                  bool beacon)
1102 {
1103         struct ieee80211_local *local = sdata->local;
1104         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1105         struct cfg80211_bss *cbss = ifmgd->associated;
1106         struct ieee80211_chanctx_conf *conf;
1107         struct ieee80211_chanctx *chanctx;
1108         enum ieee80211_band current_band;
1109         struct ieee80211_csa_ie csa_ie;
1110         struct ieee80211_channel_switch ch_switch;
1111         int res;
1112
1113         sdata_assert_lock(sdata);
1114
1115         if (!cbss)
1116                 return;
1117
1118         if (local->scanning)
1119                 return;
1120
1121         /* disregard subsequent announcements if we are already processing */
1122         if (sdata->vif.csa_active)
1123                 return;
1124
1125         current_band = cbss->channel->band;
1126         memset(&csa_ie, 0, sizeof(csa_ie));
1127         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1128                                            ifmgd->flags,
1129                                            ifmgd->associated->bssid, &csa_ie);
1130         if (res < 0)
1131                 ieee80211_queue_work(&local->hw,
1132                                      &ifmgd->csa_connection_drop_work);
1133         if (res)
1134                 return;
1135
1136         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1137                                      IEEE80211_CHAN_DISABLED)) {
1138                 sdata_info(sdata,
1139                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1140                            ifmgd->associated->bssid,
1141                            csa_ie.chandef.chan->center_freq,
1142                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1143                            csa_ie.chandef.center_freq2);
1144                 ieee80211_queue_work(&local->hw,
1145                                      &ifmgd->csa_connection_drop_work);
1146                 return;
1147         }
1148
1149         mutex_lock(&local->mtx);
1150         mutex_lock(&local->chanctx_mtx);
1151         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1152                                          lockdep_is_held(&local->chanctx_mtx));
1153         if (!conf) {
1154                 sdata_info(sdata,
1155                            "no channel context assigned to vif?, disconnecting\n");
1156                 ieee80211_queue_work(&local->hw,
1157                                      &ifmgd->csa_connection_drop_work);
1158                 mutex_unlock(&local->chanctx_mtx);
1159                 mutex_unlock(&local->mtx);
1160                 return;
1161         }
1162
1163         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1164
1165         if (local->use_chanctx &&
1166             !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1167                 sdata_info(sdata,
1168                            "driver doesn't support chan-switch with channel contexts\n");
1169                 ieee80211_queue_work(&local->hw,
1170                                      &ifmgd->csa_connection_drop_work);
1171                 mutex_unlock(&local->chanctx_mtx);
1172                 mutex_unlock(&local->mtx);
1173                 return;
1174         }
1175
1176         ch_switch.timestamp = timestamp;
1177         ch_switch.device_timestamp = device_timestamp;
1178         ch_switch.block_tx = csa_ie.mode;
1179         ch_switch.chandef = csa_ie.chandef;
1180         ch_switch.count = csa_ie.count;
1181
1182         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1183                 sdata_info(sdata,
1184                            "preparing for channel switch failed, disconnecting\n");
1185                 ieee80211_queue_work(&local->hw,
1186                                      &ifmgd->csa_connection_drop_work);
1187                 mutex_unlock(&local->chanctx_mtx);
1188                 mutex_unlock(&local->mtx);
1189                 return;
1190         }
1191
1192         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1193                                             chanctx->mode, false);
1194         if (res) {
1195                 sdata_info(sdata,
1196                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1197                            res);
1198                 ieee80211_queue_work(&local->hw,
1199                                      &ifmgd->csa_connection_drop_work);
1200                 mutex_unlock(&local->chanctx_mtx);
1201                 mutex_unlock(&local->mtx);
1202                 return;
1203         }
1204         mutex_unlock(&local->chanctx_mtx);
1205
1206         sdata->vif.csa_active = true;
1207         sdata->csa_chandef = csa_ie.chandef;
1208         sdata->csa_block_tx = csa_ie.mode;
1209
1210         if (sdata->csa_block_tx)
1211                 ieee80211_stop_vif_queues(local, sdata,
1212                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1213         mutex_unlock(&local->mtx);
1214
1215         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1216                                           csa_ie.count);
1217
1218         if (local->ops->channel_switch) {
1219                 /* use driver's channel switch callback */
1220                 drv_channel_switch(local, sdata, &ch_switch);
1221                 return;
1222         }
1223
1224         /* channel switch handled in software */
1225         if (csa_ie.count <= 1)
1226                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1227         else
1228                 mod_timer(&ifmgd->chswitch_timer,
1229                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1230                                          cbss->beacon_interval));
1231 }
1232
1233 static bool
1234 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1235                                  struct ieee80211_channel *channel,
1236                                  const u8 *country_ie, u8 country_ie_len,
1237                                  const u8 *pwr_constr_elem,
1238                                  int *chan_pwr, int *pwr_reduction)
1239 {
1240         struct ieee80211_country_ie_triplet *triplet;
1241         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1242         int i, chan_increment;
1243         bool have_chan_pwr = false;
1244
1245         /* Invalid IE */
1246         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1247                 return false;
1248
1249         triplet = (void *)(country_ie + 3);
1250         country_ie_len -= 3;
1251
1252         switch (channel->band) {
1253         default:
1254                 WARN_ON_ONCE(1);
1255                 /* fall through */
1256         case IEEE80211_BAND_2GHZ:
1257         case IEEE80211_BAND_60GHZ:
1258                 chan_increment = 1;
1259                 break;
1260         case IEEE80211_BAND_5GHZ:
1261                 chan_increment = 4;
1262                 break;
1263         }
1264
1265         /* find channel */
1266         while (country_ie_len >= 3) {
1267                 u8 first_channel = triplet->chans.first_channel;
1268
1269                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1270                         goto next;
1271
1272                 for (i = 0; i < triplet->chans.num_channels; i++) {
1273                         if (first_channel + i * chan_increment == chan) {
1274                                 have_chan_pwr = true;
1275                                 *chan_pwr = triplet->chans.max_power;
1276                                 break;
1277                         }
1278                 }
1279                 if (have_chan_pwr)
1280                         break;
1281
1282  next:
1283                 triplet++;
1284                 country_ie_len -= 3;
1285         }
1286
1287         if (have_chan_pwr)
1288                 *pwr_reduction = *pwr_constr_elem;
1289         return have_chan_pwr;
1290 }
1291
1292 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1293                                       struct ieee80211_channel *channel,
1294                                       const u8 *cisco_dtpc_ie,
1295                                       int *pwr_level)
1296 {
1297         /* From practical testing, the first data byte of the DTPC element
1298          * seems to contain the requested dBm level, and the CLI on Cisco
1299          * APs clearly state the range is -127 to 127 dBm, which indicates
1300          * a signed byte, although it seemingly never actually goes negative.
1301          * The other byte seems to always be zero.
1302          */
1303         *pwr_level = (__s8)cisco_dtpc_ie[4];
1304 }
1305
1306 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1307                                        struct ieee80211_channel *channel,
1308                                        struct ieee80211_mgmt *mgmt,
1309                                        const u8 *country_ie, u8 country_ie_len,
1310                                        const u8 *pwr_constr_ie,
1311                                        const u8 *cisco_dtpc_ie)
1312 {
1313         bool has_80211h_pwr = false, has_cisco_pwr = false;
1314         int chan_pwr = 0, pwr_reduction_80211h = 0;
1315         int pwr_level_cisco, pwr_level_80211h;
1316         int new_ap_level;
1317
1318         if (country_ie && pwr_constr_ie &&
1319             mgmt->u.probe_resp.capab_info &
1320                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT)) {
1321                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1322                         sdata, channel, country_ie, country_ie_len,
1323                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1324                 pwr_level_80211h =
1325                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1326         }
1327
1328         if (cisco_dtpc_ie) {
1329                 ieee80211_find_cisco_dtpc(
1330                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1331                 has_cisco_pwr = true;
1332         }
1333
1334         if (!has_80211h_pwr && !has_cisco_pwr)
1335                 return 0;
1336
1337         /* If we have both 802.11h and Cisco DTPC, apply both limits
1338          * by picking the smallest of the two power levels advertised.
1339          */
1340         if (has_80211h_pwr &&
1341             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1342                 sdata_info(sdata,
1343                            "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1344                            pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1345                            sdata->u.mgd.bssid);
1346                 new_ap_level = pwr_level_80211h;
1347         } else {  /* has_cisco_pwr is always true here. */
1348                 sdata_info(sdata,
1349                            "Limiting TX power to %d dBm as advertised by %pM\n",
1350                            pwr_level_cisco, sdata->u.mgd.bssid);
1351                 new_ap_level = pwr_level_cisco;
1352         }
1353
1354         if (sdata->ap_power_level == new_ap_level)
1355                 return 0;
1356
1357         sdata->ap_power_level = new_ap_level;
1358         if (__ieee80211_recalc_txpower(sdata))
1359                 return BSS_CHANGED_TXPOWER;
1360         return 0;
1361 }
1362
1363 /* powersave */
1364 static void ieee80211_enable_ps(struct ieee80211_local *local,
1365                                 struct ieee80211_sub_if_data *sdata)
1366 {
1367         struct ieee80211_conf *conf = &local->hw.conf;
1368
1369         /*
1370          * If we are scanning right now then the parameters will
1371          * take effect when scan finishes.
1372          */
1373         if (local->scanning)
1374                 return;
1375
1376         if (conf->dynamic_ps_timeout > 0 &&
1377             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1378                 mod_timer(&local->dynamic_ps_timer, jiffies +
1379                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1380         } else {
1381                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1382                         ieee80211_send_nullfunc(local, sdata, 1);
1383
1384                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1385                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1386                         return;
1387
1388                 conf->flags |= IEEE80211_CONF_PS;
1389                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1390         }
1391 }
1392
1393 static void ieee80211_change_ps(struct ieee80211_local *local)
1394 {
1395         struct ieee80211_conf *conf = &local->hw.conf;
1396
1397         if (local->ps_sdata) {
1398                 ieee80211_enable_ps(local, local->ps_sdata);
1399         } else if (conf->flags & IEEE80211_CONF_PS) {
1400                 conf->flags &= ~IEEE80211_CONF_PS;
1401                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1402                 del_timer_sync(&local->dynamic_ps_timer);
1403                 cancel_work_sync(&local->dynamic_ps_enable_work);
1404         }
1405 }
1406
1407 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1408 {
1409         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1410         struct sta_info *sta = NULL;
1411         bool authorized = false;
1412
1413         if (!mgd->powersave)
1414                 return false;
1415
1416         if (mgd->broken_ap)
1417                 return false;
1418
1419         if (!mgd->associated)
1420                 return false;
1421
1422         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1423                 return false;
1424
1425         if (!mgd->have_beacon)
1426                 return false;
1427
1428         rcu_read_lock();
1429         sta = sta_info_get(sdata, mgd->bssid);
1430         if (sta)
1431                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1432         rcu_read_unlock();
1433
1434         return authorized;
1435 }
1436
1437 /* need to hold RTNL or interface lock */
1438 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1439 {
1440         struct ieee80211_sub_if_data *sdata, *found = NULL;
1441         int count = 0;
1442         int timeout;
1443
1444         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1445                 local->ps_sdata = NULL;
1446                 return;
1447         }
1448
1449         list_for_each_entry(sdata, &local->interfaces, list) {
1450                 if (!ieee80211_sdata_running(sdata))
1451                         continue;
1452                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1453                         /* If an AP vif is found, then disable PS
1454                          * by setting the count to zero thereby setting
1455                          * ps_sdata to NULL.
1456                          */
1457                         count = 0;
1458                         break;
1459                 }
1460                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1461                         continue;
1462                 found = sdata;
1463                 count++;
1464         }
1465
1466         if (count == 1 && ieee80211_powersave_allowed(found)) {
1467                 s32 beaconint_us;
1468
1469                 if (latency < 0)
1470                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1471
1472                 beaconint_us = ieee80211_tu_to_usec(
1473                                         found->vif.bss_conf.beacon_int);
1474
1475                 timeout = local->dynamic_ps_forced_timeout;
1476                 if (timeout < 0) {
1477                         /*
1478                          * Go to full PSM if the user configures a very low
1479                          * latency requirement.
1480                          * The 2000 second value is there for compatibility
1481                          * until the PM_QOS_NETWORK_LATENCY is configured
1482                          * with real values.
1483                          */
1484                         if (latency > (1900 * USEC_PER_MSEC) &&
1485                             latency != (2000 * USEC_PER_SEC))
1486                                 timeout = 0;
1487                         else
1488                                 timeout = 100;
1489                 }
1490                 local->hw.conf.dynamic_ps_timeout = timeout;
1491
1492                 if (beaconint_us > latency) {
1493                         local->ps_sdata = NULL;
1494                 } else {
1495                         int maxslp = 1;
1496                         u8 dtimper = found->u.mgd.dtim_period;
1497
1498                         /* If the TIM IE is invalid, pretend the value is 1 */
1499                         if (!dtimper)
1500                                 dtimper = 1;
1501                         else if (dtimper > 1)
1502                                 maxslp = min_t(int, dtimper,
1503                                                     latency / beaconint_us);
1504
1505                         local->hw.conf.max_sleep_period = maxslp;
1506                         local->hw.conf.ps_dtim_period = dtimper;
1507                         local->ps_sdata = found;
1508                 }
1509         } else {
1510                 local->ps_sdata = NULL;
1511         }
1512
1513         ieee80211_change_ps(local);
1514 }
1515
1516 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1517 {
1518         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1519
1520         if (sdata->vif.bss_conf.ps != ps_allowed) {
1521                 sdata->vif.bss_conf.ps = ps_allowed;
1522                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1523         }
1524 }
1525
1526 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1527 {
1528         struct ieee80211_local *local =
1529                 container_of(work, struct ieee80211_local,
1530                              dynamic_ps_disable_work);
1531
1532         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1533                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1534                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1535         }
1536
1537         ieee80211_wake_queues_by_reason(&local->hw,
1538                                         IEEE80211_MAX_QUEUE_MAP,
1539                                         IEEE80211_QUEUE_STOP_REASON_PS,
1540                                         false);
1541 }
1542
1543 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1544 {
1545         struct ieee80211_local *local =
1546                 container_of(work, struct ieee80211_local,
1547                              dynamic_ps_enable_work);
1548         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1549         struct ieee80211_if_managed *ifmgd;
1550         unsigned long flags;
1551         int q;
1552
1553         /* can only happen when PS was just disabled anyway */
1554         if (!sdata)
1555                 return;
1556
1557         ifmgd = &sdata->u.mgd;
1558
1559         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1560                 return;
1561
1562         if (local->hw.conf.dynamic_ps_timeout > 0) {
1563                 /* don't enter PS if TX frames are pending */
1564                 if (drv_tx_frames_pending(local)) {
1565                         mod_timer(&local->dynamic_ps_timer, jiffies +
1566                                   msecs_to_jiffies(
1567                                   local->hw.conf.dynamic_ps_timeout));
1568                         return;
1569                 }
1570
1571                 /*
1572                  * transmission can be stopped by others which leads to
1573                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1574                  * is not the actual idle state.
1575                  */
1576                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1577                 for (q = 0; q < local->hw.queues; q++) {
1578                         if (local->queue_stop_reasons[q]) {
1579                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1580                                                        flags);
1581                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1582                                           msecs_to_jiffies(
1583                                           local->hw.conf.dynamic_ps_timeout));
1584                                 return;
1585                         }
1586                 }
1587                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1588         }
1589
1590         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1591             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1592                 if (drv_tx_frames_pending(local)) {
1593                         mod_timer(&local->dynamic_ps_timer, jiffies +
1594                                   msecs_to_jiffies(
1595                                   local->hw.conf.dynamic_ps_timeout));
1596                 } else {
1597                         ieee80211_send_nullfunc(local, sdata, 1);
1598                         /* Flush to get the tx status of nullfunc frame */
1599                         ieee80211_flush_queues(local, sdata);
1600                 }
1601         }
1602
1603         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1604               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1605             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1606                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1607                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1608                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1609         }
1610 }
1611
1612 void ieee80211_dynamic_ps_timer(unsigned long data)
1613 {
1614         struct ieee80211_local *local = (void *) data;
1615
1616         if (local->quiescing || local->suspended)
1617                 return;
1618
1619         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1620 }
1621
1622 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1623 {
1624         struct delayed_work *delayed_work =
1625                 container_of(work, struct delayed_work, work);
1626         struct ieee80211_sub_if_data *sdata =
1627                 container_of(delayed_work, struct ieee80211_sub_if_data,
1628                              dfs_cac_timer_work);
1629         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1630
1631         mutex_lock(&sdata->local->mtx);
1632         if (sdata->wdev.cac_started) {
1633                 ieee80211_vif_release_channel(sdata);
1634                 cfg80211_cac_event(sdata->dev, &chandef,
1635                                    NL80211_RADAR_CAC_FINISHED,
1636                                    GFP_KERNEL);
1637         }
1638         mutex_unlock(&sdata->local->mtx);
1639 }
1640
1641 static bool
1642 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1643 {
1644         struct ieee80211_local *local = sdata->local;
1645         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1646         bool ret = false;
1647         int ac;
1648
1649         if (local->hw.queues < IEEE80211_NUM_ACS)
1650                 return false;
1651
1652         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1653                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1654                 int non_acm_ac;
1655                 unsigned long now = jiffies;
1656
1657                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1658                     tx_tspec->admitted_time &&
1659                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1660                         tx_tspec->consumed_tx_time = 0;
1661                         tx_tspec->time_slice_start = now;
1662
1663                         if (tx_tspec->downgraded)
1664                                 tx_tspec->action =
1665                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1666                 }
1667
1668                 switch (tx_tspec->action) {
1669                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1670                         /* take the original parameters */
1671                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1672                                 sdata_err(sdata,
1673                                           "failed to set TX queue parameters for queue %d\n",
1674                                           ac);
1675                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1676                         tx_tspec->downgraded = false;
1677                         ret = true;
1678                         break;
1679                 case TX_TSPEC_ACTION_DOWNGRADE:
1680                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1681                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1682                                 ret = true;
1683                                 break;
1684                         }
1685                         /* downgrade next lower non-ACM AC */
1686                         for (non_acm_ac = ac + 1;
1687                              non_acm_ac < IEEE80211_NUM_ACS;
1688                              non_acm_ac++)
1689                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1690                                         break;
1691                         /* The loop will result in using BK even if it requires
1692                          * admission control, such configuration makes no sense
1693                          * and we have to transmit somehow - the AC selection
1694                          * does the same thing.
1695                          */
1696                         if (drv_conf_tx(local, sdata, ac,
1697                                         &sdata->tx_conf[non_acm_ac]))
1698                                 sdata_err(sdata,
1699                                           "failed to set TX queue parameters for queue %d\n",
1700                                           ac);
1701                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1702                         ret = true;
1703                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1704                                 tx_tspec->time_slice_start + HZ - now + 1);
1705                         break;
1706                 case TX_TSPEC_ACTION_NONE:
1707                         /* nothing now */
1708                         break;
1709                 }
1710         }
1711
1712         return ret;
1713 }
1714
1715 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1716 {
1717         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1718                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1719 }
1720
1721 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1722 {
1723         struct ieee80211_sub_if_data *sdata;
1724
1725         sdata = container_of(work, struct ieee80211_sub_if_data,
1726                              u.mgd.tx_tspec_wk.work);
1727         ieee80211_sta_handle_tspec_ac_params(sdata);
1728 }
1729
1730 /* MLME */
1731 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1732                                      struct ieee80211_sub_if_data *sdata,
1733                                      const u8 *wmm_param, size_t wmm_param_len)
1734 {
1735         struct ieee80211_tx_queue_params params;
1736         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1737         size_t left;
1738         int count;
1739         const u8 *pos;
1740         u8 uapsd_queues = 0;
1741
1742         if (!local->ops->conf_tx)
1743                 return false;
1744
1745         if (local->hw.queues < IEEE80211_NUM_ACS)
1746                 return false;
1747
1748         if (!wmm_param)
1749                 return false;
1750
1751         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1752                 return false;
1753
1754         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1755                 uapsd_queues = ifmgd->uapsd_queues;
1756
1757         count = wmm_param[6] & 0x0f;
1758         if (count == ifmgd->wmm_last_param_set)
1759                 return false;
1760         ifmgd->wmm_last_param_set = count;
1761
1762         pos = wmm_param + 8;
1763         left = wmm_param_len - 8;
1764
1765         memset(&params, 0, sizeof(params));
1766
1767         sdata->wmm_acm = 0;
1768         for (; left >= 4; left -= 4, pos += 4) {
1769                 int aci = (pos[0] >> 5) & 0x03;
1770                 int acm = (pos[0] >> 4) & 0x01;
1771                 bool uapsd = false;
1772                 int queue;
1773
1774                 switch (aci) {
1775                 case 1: /* AC_BK */
1776                         queue = 3;
1777                         if (acm)
1778                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1779                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1780                                 uapsd = true;
1781                         break;
1782                 case 2: /* AC_VI */
1783                         queue = 1;
1784                         if (acm)
1785                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1786                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1787                                 uapsd = true;
1788                         break;
1789                 case 3: /* AC_VO */
1790                         queue = 0;
1791                         if (acm)
1792                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1793                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1794                                 uapsd = true;
1795                         break;
1796                 case 0: /* AC_BE */
1797                 default:
1798                         queue = 2;
1799                         if (acm)
1800                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1801                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1802                                 uapsd = true;
1803                         break;
1804                 }
1805
1806                 params.aifs = pos[0] & 0x0f;
1807                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1808                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1809                 params.txop = get_unaligned_le16(pos + 2);
1810                 params.acm = acm;
1811                 params.uapsd = uapsd;
1812
1813                 mlme_dbg(sdata,
1814                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1815                          queue, aci, acm,
1816                          params.aifs, params.cw_min, params.cw_max,
1817                          params.txop, params.uapsd,
1818                          ifmgd->tx_tspec[queue].downgraded);
1819                 sdata->tx_conf[queue] = params;
1820                 if (!ifmgd->tx_tspec[queue].downgraded &&
1821                     drv_conf_tx(local, sdata, queue, &params))
1822                         sdata_err(sdata,
1823                                   "failed to set TX queue parameters for queue %d\n",
1824                                   queue);
1825         }
1826
1827         /* enable WMM or activate new settings */
1828         sdata->vif.bss_conf.qos = true;
1829         return true;
1830 }
1831
1832 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1833 {
1834         lockdep_assert_held(&sdata->local->mtx);
1835
1836         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1837         ieee80211_run_deferred_scan(sdata->local);
1838 }
1839
1840 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1841 {
1842         mutex_lock(&sdata->local->mtx);
1843         __ieee80211_stop_poll(sdata);
1844         mutex_unlock(&sdata->local->mtx);
1845 }
1846
1847 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1848                                            u16 capab, bool erp_valid, u8 erp)
1849 {
1850         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1851         u32 changed = 0;
1852         bool use_protection;
1853         bool use_short_preamble;
1854         bool use_short_slot;
1855
1856         if (erp_valid) {
1857                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1858                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1859         } else {
1860                 use_protection = false;
1861                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1862         }
1863
1864         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1865         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1866                 use_short_slot = true;
1867
1868         if (use_protection != bss_conf->use_cts_prot) {
1869                 bss_conf->use_cts_prot = use_protection;
1870                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1871         }
1872
1873         if (use_short_preamble != bss_conf->use_short_preamble) {
1874                 bss_conf->use_short_preamble = use_short_preamble;
1875                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1876         }
1877
1878         if (use_short_slot != bss_conf->use_short_slot) {
1879                 bss_conf->use_short_slot = use_short_slot;
1880                 changed |= BSS_CHANGED_ERP_SLOT;
1881         }
1882
1883         return changed;
1884 }
1885
1886 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1887                                      struct cfg80211_bss *cbss,
1888                                      u32 bss_info_changed)
1889 {
1890         struct ieee80211_bss *bss = (void *)cbss->priv;
1891         struct ieee80211_local *local = sdata->local;
1892         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1893
1894         bss_info_changed |= BSS_CHANGED_ASSOC;
1895         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1896                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1897
1898         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1899                 beacon_loss_count * bss_conf->beacon_int));
1900
1901         sdata->u.mgd.associated = cbss;
1902         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1903
1904         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1905
1906         if (sdata->vif.p2p) {
1907                 const struct cfg80211_bss_ies *ies;
1908
1909                 rcu_read_lock();
1910                 ies = rcu_dereference(cbss->ies);
1911                 if (ies) {
1912                         int ret;
1913
1914                         ret = cfg80211_get_p2p_attr(
1915                                         ies->data, ies->len,
1916                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1917                                         (u8 *) &bss_conf->p2p_noa_attr,
1918                                         sizeof(bss_conf->p2p_noa_attr));
1919                         if (ret >= 2) {
1920                                 sdata->u.mgd.p2p_noa_index =
1921                                         bss_conf->p2p_noa_attr.index;
1922                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1923                         }
1924                 }
1925                 rcu_read_unlock();
1926         }
1927
1928         /* just to be sure */
1929         ieee80211_stop_poll(sdata);
1930
1931         ieee80211_led_assoc(local, 1);
1932
1933         if (sdata->u.mgd.have_beacon) {
1934                 /*
1935                  * If the AP is buggy we may get here with no DTIM period
1936                  * known, so assume it's 1 which is the only safe assumption
1937                  * in that case, although if the TIM IE is broken powersave
1938                  * probably just won't work at all.
1939                  */
1940                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1941                 bss_conf->beacon_rate = bss->beacon_rate;
1942                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1943         } else {
1944                 bss_conf->beacon_rate = NULL;
1945                 bss_conf->dtim_period = 0;
1946         }
1947
1948         bss_conf->assoc = 1;
1949
1950         /* Tell the driver to monitor connection quality (if supported) */
1951         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1952             bss_conf->cqm_rssi_thold)
1953                 bss_info_changed |= BSS_CHANGED_CQM;
1954
1955         /* Enable ARP filtering */
1956         if (bss_conf->arp_addr_cnt)
1957                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1958
1959         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1960
1961         mutex_lock(&local->iflist_mtx);
1962         ieee80211_recalc_ps(local, -1);
1963         mutex_unlock(&local->iflist_mtx);
1964
1965         ieee80211_recalc_smps(sdata);
1966         ieee80211_recalc_ps_vif(sdata);
1967
1968         netif_carrier_on(sdata->dev);
1969 }
1970
1971 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1972                                    u16 stype, u16 reason, bool tx,
1973                                    u8 *frame_buf)
1974 {
1975         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1976         struct ieee80211_local *local = sdata->local;
1977         u32 changed = 0;
1978
1979         sdata_assert_lock(sdata);
1980
1981         if (WARN_ON_ONCE(tx && !frame_buf))
1982                 return;
1983
1984         if (WARN_ON(!ifmgd->associated))
1985                 return;
1986
1987         ieee80211_stop_poll(sdata);
1988
1989         ifmgd->associated = NULL;
1990         netif_carrier_off(sdata->dev);
1991
1992         /*
1993          * if we want to get out of ps before disassoc (why?) we have
1994          * to do it before sending disassoc, as otherwise the null-packet
1995          * won't be valid.
1996          */
1997         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1998                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1999                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2000         }
2001         local->ps_sdata = NULL;
2002
2003         /* disable per-vif ps */
2004         ieee80211_recalc_ps_vif(sdata);
2005
2006         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
2007         if (tx)
2008                 ieee80211_flush_queues(local, sdata);
2009
2010         /* deauthenticate/disassociate now */
2011         if (tx || frame_buf)
2012                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2013                                                reason, tx, frame_buf);
2014
2015         /* flush out frame */
2016         if (tx)
2017                 ieee80211_flush_queues(local, sdata);
2018
2019         /* clear bssid only after building the needed mgmt frames */
2020         memset(ifmgd->bssid, 0, ETH_ALEN);
2021
2022         /* remove AP and TDLS peers */
2023         sta_info_flush(sdata);
2024
2025         /* finally reset all BSS / config parameters */
2026         changed |= ieee80211_reset_erp_info(sdata);
2027
2028         ieee80211_led_assoc(local, 0);
2029         changed |= BSS_CHANGED_ASSOC;
2030         sdata->vif.bss_conf.assoc = false;
2031
2032         ifmgd->p2p_noa_index = -1;
2033         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2034                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2035
2036         /* on the next assoc, re-program HT/VHT parameters */
2037         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2038         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2039         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2040         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2041
2042         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2043
2044         del_timer_sync(&local->dynamic_ps_timer);
2045         cancel_work_sync(&local->dynamic_ps_enable_work);
2046
2047         /* Disable ARP filtering */
2048         if (sdata->vif.bss_conf.arp_addr_cnt)
2049                 changed |= BSS_CHANGED_ARP_FILTER;
2050
2051         sdata->vif.bss_conf.qos = false;
2052         changed |= BSS_CHANGED_QOS;
2053
2054         /* The BSSID (not really interesting) and HT changed */
2055         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2056         ieee80211_bss_info_change_notify(sdata, changed);
2057
2058         /* disassociated - set to defaults now */
2059         ieee80211_set_wmm_default(sdata, false);
2060
2061         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2062         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2063         del_timer_sync(&sdata->u.mgd.timer);
2064         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2065
2066         sdata->vif.bss_conf.dtim_period = 0;
2067         sdata->vif.bss_conf.beacon_rate = NULL;
2068
2069         ifmgd->have_beacon = false;
2070
2071         ifmgd->flags = 0;
2072         mutex_lock(&local->mtx);
2073         ieee80211_vif_release_channel(sdata);
2074
2075         sdata->vif.csa_active = false;
2076         ifmgd->csa_waiting_bcn = false;
2077         if (sdata->csa_block_tx) {
2078                 ieee80211_wake_vif_queues(local, sdata,
2079                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2080                 sdata->csa_block_tx = false;
2081         }
2082         mutex_unlock(&local->mtx);
2083
2084         /* existing TX TSPEC sessions no longer exist */
2085         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2086         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2087
2088         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2089 }
2090
2091 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2092                              struct ieee80211_hdr *hdr)
2093 {
2094         /*
2095          * We can postpone the mgd.timer whenever receiving unicast frames
2096          * from AP because we know that the connection is working both ways
2097          * at that time. But multicast frames (and hence also beacons) must
2098          * be ignored here, because we need to trigger the timer during
2099          * data idle periods for sending the periodic probe request to the
2100          * AP we're connected to.
2101          */
2102         if (is_multicast_ether_addr(hdr->addr1))
2103                 return;
2104
2105         ieee80211_sta_reset_conn_monitor(sdata);
2106 }
2107
2108 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2109 {
2110         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2111         struct ieee80211_local *local = sdata->local;
2112
2113         mutex_lock(&local->mtx);
2114         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2115                 goto out;
2116
2117         __ieee80211_stop_poll(sdata);
2118
2119         mutex_lock(&local->iflist_mtx);
2120         ieee80211_recalc_ps(local, -1);
2121         mutex_unlock(&local->iflist_mtx);
2122
2123         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2124                 goto out;
2125
2126         /*
2127          * We've received a probe response, but are not sure whether
2128          * we have or will be receiving any beacons or data, so let's
2129          * schedule the timers again, just in case.
2130          */
2131         ieee80211_sta_reset_beacon_monitor(sdata);
2132
2133         mod_timer(&ifmgd->conn_mon_timer,
2134                   round_jiffies_up(jiffies +
2135                                    IEEE80211_CONNECTION_IDLE_TIME));
2136 out:
2137         mutex_unlock(&local->mtx);
2138 }
2139
2140 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2141                                            struct ieee80211_hdr *hdr,
2142                                            u16 tx_time)
2143 {
2144         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2145         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2146         int ac = ieee80211_ac_from_tid(tid);
2147         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2148         unsigned long now = jiffies;
2149
2150         if (likely(!tx_tspec->admitted_time))
2151                 return;
2152
2153         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2154                 tx_tspec->consumed_tx_time = 0;
2155                 tx_tspec->time_slice_start = now;
2156
2157                 if (tx_tspec->downgraded) {
2158                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2159                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2160                 }
2161         }
2162
2163         if (tx_tspec->downgraded)
2164                 return;
2165
2166         tx_tspec->consumed_tx_time += tx_time;
2167
2168         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2169                 tx_tspec->downgraded = true;
2170                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2171                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2172         }
2173 }
2174
2175 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2176                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2177 {
2178         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2179
2180         if (!ieee80211_is_data(hdr->frame_control))
2181             return;
2182
2183         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2184             sdata->u.mgd.probe_send_count > 0) {
2185                 if (ack)
2186                         ieee80211_sta_reset_conn_monitor(sdata);
2187                 else
2188                         sdata->u.mgd.nullfunc_failed = true;
2189                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2190                 return;
2191         }
2192
2193         if (ack)
2194                 ieee80211_sta_reset_conn_monitor(sdata);
2195 }
2196
2197 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2198 {
2199         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2200         const u8 *ssid;
2201         u8 *dst = ifmgd->associated->bssid;
2202         u8 unicast_limit = max(1, max_probe_tries - 3);
2203
2204         /*
2205          * Try sending broadcast probe requests for the last three
2206          * probe requests after the first ones failed since some
2207          * buggy APs only support broadcast probe requests.
2208          */
2209         if (ifmgd->probe_send_count >= unicast_limit)
2210                 dst = NULL;
2211
2212         /*
2213          * When the hardware reports an accurate Tx ACK status, it's
2214          * better to send a nullfunc frame instead of a probe request,
2215          * as it will kick us off the AP quickly if we aren't associated
2216          * anymore. The timeout will be reset if the frame is ACKed by
2217          * the AP.
2218          */
2219         ifmgd->probe_send_count++;
2220
2221         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2222                 ifmgd->nullfunc_failed = false;
2223                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2224         } else {
2225                 int ssid_len;
2226
2227                 rcu_read_lock();
2228                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2229                 if (WARN_ON_ONCE(ssid == NULL))
2230                         ssid_len = 0;
2231                 else
2232                         ssid_len = ssid[1];
2233
2234                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
2235                                          ssid + 2, ssid_len, NULL,
2236                                          0, (u32) -1, true, 0,
2237                                          ifmgd->associated->channel, false);
2238                 rcu_read_unlock();
2239         }
2240
2241         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2242         run_again(sdata, ifmgd->probe_timeout);
2243 }
2244
2245 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2246                                    bool beacon)
2247 {
2248         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2249         bool already = false;
2250
2251         if (!ieee80211_sdata_running(sdata))
2252                 return;
2253
2254         sdata_lock(sdata);
2255
2256         if (!ifmgd->associated)
2257                 goto out;
2258
2259         mutex_lock(&sdata->local->mtx);
2260
2261         if (sdata->local->tmp_channel || sdata->local->scanning) {
2262                 mutex_unlock(&sdata->local->mtx);
2263                 goto out;
2264         }
2265
2266         if (beacon) {
2267                 mlme_dbg_ratelimited(sdata,
2268                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2269                                      beacon_loss_count);
2270
2271                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2272         }
2273
2274         /*
2275          * The driver/our work has already reported this event or the
2276          * connection monitoring has kicked in and we have already sent
2277          * a probe request. Or maybe the AP died and the driver keeps
2278          * reporting until we disassociate...
2279          *
2280          * In either case we have to ignore the current call to this
2281          * function (except for setting the correct probe reason bit)
2282          * because otherwise we would reset the timer every time and
2283          * never check whether we received a probe response!
2284          */
2285         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2286                 already = true;
2287
2288         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2289
2290         mutex_unlock(&sdata->local->mtx);
2291
2292         if (already)
2293                 goto out;
2294
2295         mutex_lock(&sdata->local->iflist_mtx);
2296         ieee80211_recalc_ps(sdata->local, -1);
2297         mutex_unlock(&sdata->local->iflist_mtx);
2298
2299         ifmgd->probe_send_count = 0;
2300         ieee80211_mgd_probe_ap_send(sdata);
2301  out:
2302         sdata_unlock(sdata);
2303 }
2304
2305 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2306                                           struct ieee80211_vif *vif)
2307 {
2308         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2309         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2310         struct cfg80211_bss *cbss;
2311         struct sk_buff *skb;
2312         const u8 *ssid;
2313         int ssid_len;
2314
2315         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2316                 return NULL;
2317
2318         sdata_assert_lock(sdata);
2319
2320         if (ifmgd->associated)
2321                 cbss = ifmgd->associated;
2322         else if (ifmgd->auth_data)
2323                 cbss = ifmgd->auth_data->bss;
2324         else if (ifmgd->assoc_data)
2325                 cbss = ifmgd->assoc_data->bss;
2326         else
2327                 return NULL;
2328
2329         rcu_read_lock();
2330         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2331         if (WARN_ON_ONCE(ssid == NULL))
2332                 ssid_len = 0;
2333         else
2334                 ssid_len = ssid[1];
2335
2336         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2337                                         (u32) -1, cbss->channel,
2338                                         ssid + 2, ssid_len,
2339                                         NULL, 0, true);
2340         rcu_read_unlock();
2341
2342         return skb;
2343 }
2344 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2345
2346 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2347 {
2348         struct ieee80211_local *local = sdata->local;
2349         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2350         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2351
2352         sdata_lock(sdata);
2353         if (!ifmgd->associated) {
2354                 sdata_unlock(sdata);
2355                 return;
2356         }
2357
2358         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2359                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2360                                true, frame_buf);
2361         mutex_lock(&local->mtx);
2362         sdata->vif.csa_active = false;
2363         ifmgd->csa_waiting_bcn = false;
2364         if (sdata->csa_block_tx) {
2365                 ieee80211_wake_vif_queues(local, sdata,
2366                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2367                 sdata->csa_block_tx = false;
2368         }
2369         mutex_unlock(&local->mtx);
2370
2371         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2372                               IEEE80211_DEAUTH_FRAME_LEN);
2373         sdata_unlock(sdata);
2374 }
2375
2376 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2377 {
2378         struct ieee80211_sub_if_data *sdata =
2379                 container_of(work, struct ieee80211_sub_if_data,
2380                              u.mgd.beacon_connection_loss_work);
2381         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2382         struct sta_info *sta;
2383
2384         if (ifmgd->associated) {
2385                 rcu_read_lock();
2386                 sta = sta_info_get(sdata, ifmgd->bssid);
2387                 if (sta)
2388                         sta->beacon_loss_count++;
2389                 rcu_read_unlock();
2390         }
2391
2392         if (ifmgd->connection_loss) {
2393                 sdata_info(sdata, "Connection to AP %pM lost\n",
2394                            ifmgd->bssid);
2395                 __ieee80211_disconnect(sdata);
2396         } else {
2397                 ieee80211_mgd_probe_ap(sdata, true);
2398         }
2399 }
2400
2401 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2402 {
2403         struct ieee80211_sub_if_data *sdata =
2404                 container_of(work, struct ieee80211_sub_if_data,
2405                              u.mgd.csa_connection_drop_work);
2406
2407         __ieee80211_disconnect(sdata);
2408 }
2409
2410 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2411 {
2412         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2413         struct ieee80211_hw *hw = &sdata->local->hw;
2414
2415         trace_api_beacon_loss(sdata);
2416
2417         sdata->u.mgd.connection_loss = false;
2418         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2419 }
2420 EXPORT_SYMBOL(ieee80211_beacon_loss);
2421
2422 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2423 {
2424         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2425         struct ieee80211_hw *hw = &sdata->local->hw;
2426
2427         trace_api_connection_loss(sdata);
2428
2429         sdata->u.mgd.connection_loss = true;
2430         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2431 }
2432 EXPORT_SYMBOL(ieee80211_connection_loss);
2433
2434
2435 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2436                                         bool assoc)
2437 {
2438         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2439
2440         sdata_assert_lock(sdata);
2441
2442         if (!assoc) {
2443                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2444
2445                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2446                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2447                 sdata->u.mgd.flags = 0;
2448                 mutex_lock(&sdata->local->mtx);
2449                 ieee80211_vif_release_channel(sdata);
2450                 mutex_unlock(&sdata->local->mtx);
2451         }
2452
2453         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2454         kfree(auth_data);
2455         sdata->u.mgd.auth_data = NULL;
2456 }
2457
2458 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2459                                      struct ieee80211_mgmt *mgmt, size_t len)
2460 {
2461         struct ieee80211_local *local = sdata->local;
2462         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2463         u8 *pos;
2464         struct ieee802_11_elems elems;
2465         u32 tx_flags = 0;
2466
2467         pos = mgmt->u.auth.variable;
2468         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2469         if (!elems.challenge)
2470                 return;
2471         auth_data->expected_transaction = 4;
2472         drv_mgd_prepare_tx(sdata->local, sdata);
2473         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2474                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2475                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2476         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2477                             elems.challenge - 2, elems.challenge_len + 2,
2478                             auth_data->bss->bssid, auth_data->bss->bssid,
2479                             auth_data->key, auth_data->key_len,
2480                             auth_data->key_idx, tx_flags);
2481 }
2482
2483 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2484                                    struct ieee80211_mgmt *mgmt, size_t len)
2485 {
2486         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2487         u8 bssid[ETH_ALEN];
2488         u16 auth_alg, auth_transaction, status_code;
2489         struct sta_info *sta;
2490
2491         sdata_assert_lock(sdata);
2492
2493         if (len < 24 + 6)
2494                 return;
2495
2496         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2497                 return;
2498
2499         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2500
2501         if (!ether_addr_equal(bssid, mgmt->bssid))
2502                 return;
2503
2504         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2505         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2506         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2507
2508         if (auth_alg != ifmgd->auth_data->algorithm ||
2509             auth_transaction != ifmgd->auth_data->expected_transaction) {
2510                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2511                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2512                            auth_transaction,
2513                            ifmgd->auth_data->expected_transaction);
2514                 return;
2515         }
2516
2517         if (status_code != WLAN_STATUS_SUCCESS) {
2518                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2519                            mgmt->sa, status_code);
2520                 ieee80211_destroy_auth_data(sdata, false);
2521                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2522                 return;
2523         }
2524
2525         switch (ifmgd->auth_data->algorithm) {
2526         case WLAN_AUTH_OPEN:
2527         case WLAN_AUTH_LEAP:
2528         case WLAN_AUTH_FT:
2529         case WLAN_AUTH_SAE:
2530                 break;
2531         case WLAN_AUTH_SHARED_KEY:
2532                 if (ifmgd->auth_data->expected_transaction != 4) {
2533                         ieee80211_auth_challenge(sdata, mgmt, len);
2534                         /* need another frame */
2535                         return;
2536                 }
2537                 break;
2538         default:
2539                 WARN_ONCE(1, "invalid auth alg %d",
2540                           ifmgd->auth_data->algorithm);
2541                 return;
2542         }
2543
2544         sdata_info(sdata, "authenticated\n");
2545         ifmgd->auth_data->done = true;
2546         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2547         ifmgd->auth_data->timeout_started = true;
2548         run_again(sdata, ifmgd->auth_data->timeout);
2549
2550         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2551             ifmgd->auth_data->expected_transaction != 2) {
2552                 /*
2553                  * Report auth frame to user space for processing since another
2554                  * round of Authentication frames is still needed.
2555                  */
2556                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2557                 return;
2558         }
2559
2560         /* move station state to auth */
2561         mutex_lock(&sdata->local->sta_mtx);
2562         sta = sta_info_get(sdata, bssid);
2563         if (!sta) {
2564                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2565                 goto out_err;
2566         }
2567         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2568                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2569                 goto out_err;
2570         }
2571         mutex_unlock(&sdata->local->sta_mtx);
2572
2573         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2574         return;
2575  out_err:
2576         mutex_unlock(&sdata->local->sta_mtx);
2577         /* ignore frame -- wait for timeout */
2578 }
2579
2580 #define case_WLAN(type) \
2581         case WLAN_REASON_##type: return #type
2582
2583 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2584 {
2585         switch (reason_code) {
2586         case_WLAN(UNSPECIFIED);
2587         case_WLAN(PREV_AUTH_NOT_VALID);
2588         case_WLAN(DEAUTH_LEAVING);
2589         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2590         case_WLAN(DISASSOC_AP_BUSY);
2591         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2592         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2593         case_WLAN(DISASSOC_STA_HAS_LEFT);
2594         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2595         case_WLAN(DISASSOC_BAD_POWER);
2596         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2597         case_WLAN(INVALID_IE);
2598         case_WLAN(MIC_FAILURE);
2599         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2600         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2601         case_WLAN(IE_DIFFERENT);
2602         case_WLAN(INVALID_GROUP_CIPHER);
2603         case_WLAN(INVALID_PAIRWISE_CIPHER);
2604         case_WLAN(INVALID_AKMP);
2605         case_WLAN(UNSUPP_RSN_VERSION);
2606         case_WLAN(INVALID_RSN_IE_CAP);
2607         case_WLAN(IEEE8021X_FAILED);
2608         case_WLAN(CIPHER_SUITE_REJECTED);
2609         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2610         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2611         case_WLAN(DISASSOC_LOW_ACK);
2612         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2613         case_WLAN(QSTA_LEAVE_QBSS);
2614         case_WLAN(QSTA_NOT_USE);
2615         case_WLAN(QSTA_REQUIRE_SETUP);
2616         case_WLAN(QSTA_TIMEOUT);
2617         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2618         case_WLAN(MESH_PEER_CANCELED);
2619         case_WLAN(MESH_MAX_PEERS);
2620         case_WLAN(MESH_CONFIG);
2621         case_WLAN(MESH_CLOSE);
2622         case_WLAN(MESH_MAX_RETRIES);
2623         case_WLAN(MESH_CONFIRM_TIMEOUT);
2624         case_WLAN(MESH_INVALID_GTK);
2625         case_WLAN(MESH_INCONSISTENT_PARAM);
2626         case_WLAN(MESH_INVALID_SECURITY);
2627         case_WLAN(MESH_PATH_ERROR);
2628         case_WLAN(MESH_PATH_NOFORWARD);
2629         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2630         case_WLAN(MAC_EXISTS_IN_MBSS);
2631         case_WLAN(MESH_CHAN_REGULATORY);
2632         case_WLAN(MESH_CHAN);
2633         default: return "<unknown>";
2634         }
2635 }
2636
2637 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2638                                      struct ieee80211_mgmt *mgmt, size_t len)
2639 {
2640         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2641         const u8 *bssid = NULL;
2642         u16 reason_code;
2643
2644         sdata_assert_lock(sdata);
2645
2646         if (len < 24 + 2)
2647                 return;
2648
2649         if (!ifmgd->associated ||
2650             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2651                 return;
2652
2653         bssid = ifmgd->associated->bssid;
2654
2655         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2656
2657         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2658                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2659
2660         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2661
2662         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2663 }
2664
2665
2666 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2667                                        struct ieee80211_mgmt *mgmt, size_t len)
2668 {
2669         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2670         u16 reason_code;
2671
2672         sdata_assert_lock(sdata);
2673
2674         if (len < 24 + 2)
2675                 return;
2676
2677         if (!ifmgd->associated ||
2678             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2679                 return;
2680
2681         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2682
2683         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2684                    mgmt->sa, reason_code);
2685
2686         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2687
2688         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2689 }
2690
2691 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2692                                 u8 *supp_rates, unsigned int supp_rates_len,
2693                                 u32 *rates, u32 *basic_rates,
2694                                 bool *have_higher_than_11mbit,
2695                                 int *min_rate, int *min_rate_index,
2696                                 int shift, u32 rate_flags)
2697 {
2698         int i, j;
2699
2700         for (i = 0; i < supp_rates_len; i++) {
2701                 int rate = supp_rates[i] & 0x7f;
2702                 bool is_basic = !!(supp_rates[i] & 0x80);
2703
2704                 if ((rate * 5 * (1 << shift)) > 110)
2705                         *have_higher_than_11mbit = true;
2706
2707                 /*
2708                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2709                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2710                  *
2711                  * Note: Even through the membership selector and the basic
2712                  *       rate flag share the same bit, they are not exactly
2713                  *       the same.
2714                  */
2715                 if (!!(supp_rates[i] & 0x80) &&
2716                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2717                         continue;
2718
2719                 for (j = 0; j < sband->n_bitrates; j++) {
2720                         struct ieee80211_rate *br;
2721                         int brate;
2722
2723                         br = &sband->bitrates[j];
2724                         if ((rate_flags & br->flags) != rate_flags)
2725                                 continue;
2726
2727                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2728                         if (brate == rate) {
2729                                 *rates |= BIT(j);
2730                                 if (is_basic)
2731                                         *basic_rates |= BIT(j);
2732                                 if ((rate * 5) < *min_rate) {
2733                                         *min_rate = rate * 5;
2734                                         *min_rate_index = j;
2735                                 }
2736                                 break;
2737                         }
2738                 }
2739         }
2740 }
2741
2742 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2743                                          bool assoc)
2744 {
2745         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2746
2747         sdata_assert_lock(sdata);
2748
2749         if (!assoc) {
2750                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2751
2752                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2753                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2754                 sdata->u.mgd.flags = 0;
2755                 mutex_lock(&sdata->local->mtx);
2756                 ieee80211_vif_release_channel(sdata);
2757                 mutex_unlock(&sdata->local->mtx);
2758         }
2759
2760         kfree(assoc_data);
2761         sdata->u.mgd.assoc_data = NULL;
2762 }
2763
2764 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2765                                     struct cfg80211_bss *cbss,
2766                                     struct ieee80211_mgmt *mgmt, size_t len)
2767 {
2768         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2769         struct ieee80211_local *local = sdata->local;
2770         struct ieee80211_supported_band *sband;
2771         struct sta_info *sta;
2772         u8 *pos;
2773         u16 capab_info, aid;
2774         struct ieee802_11_elems elems;
2775         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2776         const struct cfg80211_bss_ies *bss_ies = NULL;
2777         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2778         u32 changed = 0;
2779         int err;
2780         bool ret;
2781
2782         /* AssocResp and ReassocResp have identical structure */
2783
2784         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2785         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2786
2787         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2788                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2789                            aid);
2790         aid &= ~(BIT(15) | BIT(14));
2791
2792         ifmgd->broken_ap = false;
2793
2794         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2795                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2796                            aid);
2797                 aid = 0;
2798                 ifmgd->broken_ap = true;
2799         }
2800
2801         pos = mgmt->u.assoc_resp.variable;
2802         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2803
2804         if (!elems.supp_rates) {
2805                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2806                 return false;
2807         }
2808
2809         ifmgd->aid = aid;
2810         ifmgd->tdls_chan_switch_prohibited =
2811                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2812                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2813
2814         /*
2815          * Some APs are erroneously not including some information in their
2816          * (re)association response frames. Try to recover by using the data
2817          * from the beacon or probe response. This seems to afflict mobile
2818          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2819          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2820          */
2821         if ((assoc_data->wmm && !elems.wmm_param) ||
2822             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2823              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2824             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2825              (!elems.vht_cap_elem || !elems.vht_operation))) {
2826                 const struct cfg80211_bss_ies *ies;
2827                 struct ieee802_11_elems bss_elems;
2828
2829                 rcu_read_lock();
2830                 ies = rcu_dereference(cbss->ies);
2831                 if (ies)
2832                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2833                                           GFP_ATOMIC);
2834                 rcu_read_unlock();
2835                 if (!bss_ies)
2836                         return false;
2837
2838                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2839                                        false, &bss_elems);
2840                 if (assoc_data->wmm &&
2841                     !elems.wmm_param && bss_elems.wmm_param) {
2842                         elems.wmm_param = bss_elems.wmm_param;
2843                         sdata_info(sdata,
2844                                    "AP bug: WMM param missing from AssocResp\n");
2845                 }
2846
2847                 /*
2848                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2849                  * have to include the IEs in the (re)association response.
2850                  */
2851                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2852                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2853                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2854                         sdata_info(sdata,
2855                                    "AP bug: HT capability missing from AssocResp\n");
2856                 }
2857                 if (!elems.ht_operation && bss_elems.ht_operation &&
2858                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2859                         elems.ht_operation = bss_elems.ht_operation;
2860                         sdata_info(sdata,
2861                                    "AP bug: HT operation missing from AssocResp\n");
2862                 }
2863                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2864                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2865                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2866                         sdata_info(sdata,
2867                                    "AP bug: VHT capa missing from AssocResp\n");
2868                 }
2869                 if (!elems.vht_operation && bss_elems.vht_operation &&
2870                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2871                         elems.vht_operation = bss_elems.vht_operation;
2872                         sdata_info(sdata,
2873                                    "AP bug: VHT operation missing from AssocResp\n");
2874                 }
2875         }
2876
2877         /*
2878          * We previously checked these in the beacon/probe response, so
2879          * they should be present here. This is just a safety net.
2880          */
2881         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2882             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2883                 sdata_info(sdata,
2884                            "HT AP is missing WMM params or HT capability/operation\n");
2885                 ret = false;
2886                 goto out;
2887         }
2888
2889         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2890             (!elems.vht_cap_elem || !elems.vht_operation)) {
2891                 sdata_info(sdata,
2892                            "VHT AP is missing VHT capability/operation\n");
2893                 ret = false;
2894                 goto out;
2895         }
2896
2897         mutex_lock(&sdata->local->sta_mtx);
2898         /*
2899          * station info was already allocated and inserted before
2900          * the association and should be available to us
2901          */
2902         sta = sta_info_get(sdata, cbss->bssid);
2903         if (WARN_ON(!sta)) {
2904                 mutex_unlock(&sdata->local->sta_mtx);
2905                 ret = false;
2906                 goto out;
2907         }
2908
2909         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2910
2911         /* Set up internal HT/VHT capabilities */
2912         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2913                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2914                                                   elems.ht_cap_elem, sta);
2915
2916         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2917                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2918                                                     elems.vht_cap_elem, sta);
2919
2920         /*
2921          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2922          * in their association response, so ignore that data for our own
2923          * configuration. If it changed since the last beacon, we'll get the
2924          * next beacon and update then.
2925          */
2926
2927         /*
2928          * If an operating mode notification IE is present, override the
2929          * NSS calculation (that would be done in rate_control_rate_init())
2930          * and use the # of streams from that element.
2931          */
2932         if (elems.opmode_notif &&
2933             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2934                 u8 nss;
2935
2936                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2937                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2938                 nss += 1;
2939                 sta->sta.rx_nss = nss;
2940         }
2941
2942         rate_control_rate_init(sta);
2943
2944         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2945                 set_sta_flag(sta, WLAN_STA_MFP);
2946
2947         sta->sta.wme = elems.wmm_param;
2948
2949         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2950         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2951                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2952         if (err) {
2953                 sdata_info(sdata,
2954                            "failed to move station %pM to desired state\n",
2955                            sta->sta.addr);
2956                 WARN_ON(__sta_info_destroy(sta));
2957                 mutex_unlock(&sdata->local->sta_mtx);
2958                 ret = false;
2959                 goto out;
2960         }
2961
2962         mutex_unlock(&sdata->local->sta_mtx);
2963
2964         /*
2965          * Always handle WMM once after association regardless
2966          * of the first value the AP uses. Setting -1 here has
2967          * that effect because the AP values is an unsigned
2968          * 4-bit value.
2969          */
2970         ifmgd->wmm_last_param_set = -1;
2971
2972         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2973                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2974                                          elems.wmm_param_len);
2975         else
2976                 ieee80211_set_wmm_default(sdata, false);
2977         changed |= BSS_CHANGED_QOS;
2978
2979         /* set AID and assoc capability,
2980          * ieee80211_set_associated() will tell the driver */
2981         bss_conf->aid = aid;
2982         bss_conf->assoc_capability = capab_info;
2983         ieee80211_set_associated(sdata, cbss, changed);
2984
2985         /*
2986          * If we're using 4-addr mode, let the AP know that we're
2987          * doing so, so that it can create the STA VLAN on its side
2988          */
2989         if (ifmgd->use_4addr)
2990                 ieee80211_send_4addr_nullfunc(local, sdata);
2991
2992         /*
2993          * Start timer to probe the connection to the AP now.
2994          * Also start the timer that will detect beacon loss.
2995          */
2996         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2997         ieee80211_sta_reset_beacon_monitor(sdata);
2998
2999         ret = true;
3000  out:
3001         kfree(bss_ies);
3002         return ret;
3003 }
3004
3005 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3006                                          struct ieee80211_mgmt *mgmt,
3007                                          size_t len)
3008 {
3009         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3010         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3011         u16 capab_info, status_code, aid;
3012         struct ieee802_11_elems elems;
3013         int ac, uapsd_queues = -1;
3014         u8 *pos;
3015         bool reassoc;
3016         struct cfg80211_bss *bss;
3017
3018         sdata_assert_lock(sdata);
3019
3020         if (!assoc_data)
3021                 return;
3022         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3023                 return;
3024
3025         /*
3026          * AssocResp and ReassocResp have identical structure, so process both
3027          * of them in this function.
3028          */
3029
3030         if (len < 24 + 6)
3031                 return;
3032
3033         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3034         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3035         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3036         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3037
3038         sdata_info(sdata,
3039                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3040                    reassoc ? "Rea" : "A", mgmt->sa,
3041                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3042
3043         pos = mgmt->u.assoc_resp.variable;
3044         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3045
3046         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3047             elems.timeout_int &&
3048             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3049                 u32 tu, ms;
3050                 tu = le32_to_cpu(elems.timeout_int->value);
3051                 ms = tu * 1024 / 1000;
3052                 sdata_info(sdata,
3053                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3054                            mgmt->sa, tu, ms);
3055                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3056                 assoc_data->timeout_started = true;
3057                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3058                         run_again(sdata, assoc_data->timeout);
3059                 return;
3060         }
3061
3062         bss = assoc_data->bss;
3063
3064         if (status_code != WLAN_STATUS_SUCCESS) {
3065                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3066                            mgmt->sa, status_code);
3067                 ieee80211_destroy_assoc_data(sdata, false);
3068         } else {
3069                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3070                         /* oops -- internal error -- send timeout for now */
3071                         ieee80211_destroy_assoc_data(sdata, false);
3072                         cfg80211_assoc_timeout(sdata->dev, bss);
3073                         return;
3074                 }
3075                 sdata_info(sdata, "associated\n");
3076
3077                 /*
3078                  * destroy assoc_data afterwards, as otherwise an idle
3079                  * recalc after assoc_data is NULL but before associated
3080                  * is set can cause the interface to go idle
3081                  */
3082                 ieee80211_destroy_assoc_data(sdata, true);
3083
3084                 /* get uapsd queues configuration */
3085                 uapsd_queues = 0;
3086                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3087                         if (sdata->tx_conf[ac].uapsd)
3088                                 uapsd_queues |= BIT(ac);
3089         }
3090
3091         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3092 }
3093
3094 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3095                                   struct ieee80211_mgmt *mgmt, size_t len,
3096                                   struct ieee80211_rx_status *rx_status,
3097                                   struct ieee802_11_elems *elems)
3098 {
3099         struct ieee80211_local *local = sdata->local;
3100         struct ieee80211_bss *bss;
3101         struct ieee80211_channel *channel;
3102
3103         sdata_assert_lock(sdata);
3104
3105         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3106         if (!channel)
3107                 return;
3108
3109         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3110                                         channel);
3111         if (bss) {
3112                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3113                 ieee80211_rx_bss_put(local, bss);
3114         }
3115 }
3116
3117
3118 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3119                                          struct sk_buff *skb)
3120 {
3121         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3122         struct ieee80211_if_managed *ifmgd;
3123         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3124         size_t baselen, len = skb->len;
3125         struct ieee802_11_elems elems;
3126
3127         ifmgd = &sdata->u.mgd;
3128
3129         sdata_assert_lock(sdata);
3130
3131         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3132                 return; /* ignore ProbeResp to foreign address */
3133
3134         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3135         if (baselen > len)
3136                 return;
3137
3138         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3139                                false, &elems);
3140
3141         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3142
3143         if (ifmgd->associated &&
3144             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3145                 ieee80211_reset_ap_probe(sdata);
3146
3147         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3148             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3149                 /* got probe response, continue with auth */
3150                 sdata_info(sdata, "direct probe responded\n");
3151                 ifmgd->auth_data->tries = 0;
3152                 ifmgd->auth_data->timeout = jiffies;
3153                 ifmgd->auth_data->timeout_started = true;
3154                 run_again(sdata, ifmgd->auth_data->timeout);
3155         }
3156 }
3157
3158 /*
3159  * This is the canonical list of information elements we care about,
3160  * the filter code also gives us all changes to the Microsoft OUI
3161  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3162  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3163  * changes to requested client power.
3164  *
3165  * We implement beacon filtering in software since that means we can
3166  * avoid processing the frame here and in cfg80211, and userspace
3167  * will not be able to tell whether the hardware supports it or not.
3168  *
3169  * XXX: This list needs to be dynamic -- userspace needs to be able to
3170  *      add items it requires. It also needs to be able to tell us to
3171  *      look out for other vendor IEs.
3172  */
3173 static const u64 care_about_ies =
3174         (1ULL << WLAN_EID_COUNTRY) |
3175         (1ULL << WLAN_EID_ERP_INFO) |
3176         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3177         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3178         (1ULL << WLAN_EID_HT_CAPABILITY) |
3179         (1ULL << WLAN_EID_HT_OPERATION);
3180
3181 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3182                                      struct ieee80211_mgmt *mgmt, size_t len,
3183                                      struct ieee80211_rx_status *rx_status)
3184 {
3185         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3186         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3187         size_t baselen;
3188         struct ieee802_11_elems elems;
3189         struct ieee80211_local *local = sdata->local;
3190         struct ieee80211_chanctx_conf *chanctx_conf;
3191         struct ieee80211_channel *chan;
3192         struct sta_info *sta;
3193         u32 changed = 0;
3194         bool erp_valid;
3195         u8 erp_value = 0;
3196         u32 ncrc;
3197         u8 *bssid;
3198         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3199
3200         sdata_assert_lock(sdata);
3201
3202         /* Process beacon from the current BSS */
3203         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3204         if (baselen > len)
3205                 return;
3206
3207         rcu_read_lock();
3208         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3209         if (!chanctx_conf) {
3210                 rcu_read_unlock();
3211                 return;
3212         }
3213
3214         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3215                 rcu_read_unlock();
3216                 return;
3217         }
3218         chan = chanctx_conf->def.chan;
3219         rcu_read_unlock();
3220
3221         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3222             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3223                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3224                                        len - baselen, false, &elems);
3225
3226                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3227                 if (elems.tim && !elems.parse_error) {
3228                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3229                         ifmgd->dtim_period = tim_ie->dtim_period;
3230                 }
3231                 ifmgd->have_beacon = true;
3232                 ifmgd->assoc_data->need_beacon = false;
3233                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3234                         sdata->vif.bss_conf.sync_tsf =
3235                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3236                         sdata->vif.bss_conf.sync_device_ts =
3237                                 rx_status->device_timestamp;
3238                         if (elems.tim)
3239                                 sdata->vif.bss_conf.sync_dtim_count =
3240                                         elems.tim->dtim_count;
3241                         else
3242                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3243                 }
3244                 /* continue assoc process */
3245                 ifmgd->assoc_data->timeout = jiffies;
3246                 ifmgd->assoc_data->timeout_started = true;
3247                 run_again(sdata, ifmgd->assoc_data->timeout);
3248                 return;
3249         }
3250
3251         if (!ifmgd->associated ||
3252             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3253                 return;
3254         bssid = ifmgd->associated->bssid;
3255
3256         /* Track average RSSI from the Beacon frames of the current AP */
3257         ifmgd->last_beacon_signal = rx_status->signal;
3258         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3259                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3260                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3261                 ifmgd->last_cqm_event_signal = 0;
3262                 ifmgd->count_beacon_signal = 1;
3263                 ifmgd->last_ave_beacon_signal = 0;
3264         } else {
3265                 ifmgd->ave_beacon_signal =
3266                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3267                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3268                          ifmgd->ave_beacon_signal) / 16;
3269                 ifmgd->count_beacon_signal++;
3270         }
3271
3272         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3273             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3274                 int sig = ifmgd->ave_beacon_signal;
3275                 int last_sig = ifmgd->last_ave_beacon_signal;
3276
3277                 /*
3278                  * if signal crosses either of the boundaries, invoke callback
3279                  * with appropriate parameters
3280                  */
3281                 if (sig > ifmgd->rssi_max_thold &&
3282                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3283                         ifmgd->last_ave_beacon_signal = sig;
3284                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3285                 } else if (sig < ifmgd->rssi_min_thold &&
3286                            (last_sig >= ifmgd->rssi_max_thold ||
3287                            last_sig == 0)) {
3288                         ifmgd->last_ave_beacon_signal = sig;
3289                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3290                 }
3291         }
3292
3293         if (bss_conf->cqm_rssi_thold &&
3294             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3295             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3296                 int sig = ifmgd->ave_beacon_signal / 16;
3297                 int last_event = ifmgd->last_cqm_event_signal;
3298                 int thold = bss_conf->cqm_rssi_thold;
3299                 int hyst = bss_conf->cqm_rssi_hyst;
3300                 if (sig < thold &&
3301                     (last_event == 0 || sig < last_event - hyst)) {
3302                         ifmgd->last_cqm_event_signal = sig;
3303                         ieee80211_cqm_rssi_notify(
3304                                 &sdata->vif,
3305                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3306                                 GFP_KERNEL);
3307                 } else if (sig > thold &&
3308                            (last_event == 0 || sig > last_event + hyst)) {
3309                         ifmgd->last_cqm_event_signal = sig;
3310                         ieee80211_cqm_rssi_notify(
3311                                 &sdata->vif,
3312                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3313                                 GFP_KERNEL);
3314                 }
3315         }
3316
3317         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3318                 mlme_dbg_ratelimited(sdata,
3319                                      "cancelling AP probe due to a received beacon\n");
3320                 ieee80211_reset_ap_probe(sdata);
3321         }
3322
3323         /*
3324          * Push the beacon loss detection into the future since
3325          * we are processing a beacon from the AP just now.
3326          */
3327         ieee80211_sta_reset_beacon_monitor(sdata);
3328
3329         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3330         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3331                                           len - baselen, false, &elems,
3332                                           care_about_ies, ncrc);
3333
3334         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3335                 bool directed_tim = ieee80211_check_tim(elems.tim,
3336                                                         elems.tim_len,
3337                                                         ifmgd->aid);
3338                 if (directed_tim) {
3339                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3340                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3341                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3342                                         ieee80211_hw_config(local,
3343                                                             IEEE80211_CONF_CHANGE_PS);
3344                                 }
3345                                 ieee80211_send_nullfunc(local, sdata, 0);
3346                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3347                                 local->pspolling = true;
3348
3349                                 /*
3350                                  * Here is assumed that the driver will be
3351                                  * able to send ps-poll frame and receive a
3352                                  * response even though power save mode is
3353                                  * enabled, but some drivers might require
3354                                  * to disable power save here. This needs
3355                                  * to be investigated.
3356                                  */
3357                                 ieee80211_send_pspoll(local, sdata);
3358                         }
3359                 }
3360         }
3361
3362         if (sdata->vif.p2p) {
3363                 struct ieee80211_p2p_noa_attr noa = {};
3364                 int ret;
3365
3366                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3367                                             len - baselen,
3368                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3369                                             (u8 *) &noa, sizeof(noa));
3370                 if (ret >= 2) {
3371                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3372                                 /* valid noa_attr and index changed */
3373                                 sdata->u.mgd.p2p_noa_index = noa.index;
3374                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3375                                 changed |= BSS_CHANGED_P2P_PS;
3376                                 /*
3377                                  * make sure we update all information, the CRC
3378                                  * mechanism doesn't look at P2P attributes.
3379                                  */
3380                                 ifmgd->beacon_crc_valid = false;
3381                         }
3382                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3383                         /* noa_attr not found and we had valid noa_attr before */
3384                         sdata->u.mgd.p2p_noa_index = -1;
3385                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3386                         changed |= BSS_CHANGED_P2P_PS;
3387                         ifmgd->beacon_crc_valid = false;
3388                 }
3389         }
3390
3391         if (ifmgd->csa_waiting_bcn)
3392                 ieee80211_chswitch_post_beacon(sdata);
3393
3394         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3395                 return;
3396         ifmgd->beacon_crc = ncrc;
3397         ifmgd->beacon_crc_valid = true;
3398
3399         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3400
3401         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3402                                          rx_status->device_timestamp,
3403                                          &elems, true);
3404
3405         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3406             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3407                                      elems.wmm_param_len))
3408                 changed |= BSS_CHANGED_QOS;
3409
3410         /*
3411          * If we haven't had a beacon before, tell the driver about the
3412          * DTIM period (and beacon timing if desired) now.
3413          */
3414         if (!ifmgd->have_beacon) {
3415                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3416                 if (elems.tim)
3417                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3418                 else
3419                         bss_conf->dtim_period = 1;
3420
3421                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3422                         sdata->vif.bss_conf.sync_tsf =
3423                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3424                         sdata->vif.bss_conf.sync_device_ts =
3425                                 rx_status->device_timestamp;
3426                         if (elems.tim)
3427                                 sdata->vif.bss_conf.sync_dtim_count =
3428                                         elems.tim->dtim_count;
3429                         else
3430                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3431                 }
3432
3433                 changed |= BSS_CHANGED_BEACON_INFO;
3434                 ifmgd->have_beacon = true;
3435
3436                 mutex_lock(&local->iflist_mtx);
3437                 ieee80211_recalc_ps(local, -1);
3438                 mutex_unlock(&local->iflist_mtx);
3439
3440                 ieee80211_recalc_ps_vif(sdata);
3441         }
3442
3443         if (elems.erp_info) {
3444                 erp_valid = true;
3445                 erp_value = elems.erp_info[0];
3446         } else {
3447                 erp_valid = false;
3448         }
3449         changed |= ieee80211_handle_bss_capability(sdata,
3450                         le16_to_cpu(mgmt->u.beacon.capab_info),
3451                         erp_valid, erp_value);
3452
3453         mutex_lock(&local->sta_mtx);
3454         sta = sta_info_get(sdata, bssid);
3455
3456         if (ieee80211_config_bw(sdata, sta,
3457                                 elems.ht_cap_elem, elems.ht_operation,
3458                                 elems.vht_operation, bssid, &changed)) {
3459                 mutex_unlock(&local->sta_mtx);
3460                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3461                                        WLAN_REASON_DEAUTH_LEAVING,
3462                                        true, deauth_buf);
3463                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3464                                       sizeof(deauth_buf));
3465                 return;
3466         }
3467
3468         if (sta && elems.opmode_notif)
3469                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3470                                             rx_status->band, true);
3471         mutex_unlock(&local->sta_mtx);
3472
3473         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3474                                                elems.country_elem,
3475                                                elems.country_elem_len,
3476                                                elems.pwr_constr_elem,
3477                                                elems.cisco_dtpc_elem);
3478
3479         ieee80211_bss_info_change_notify(sdata, changed);
3480 }
3481
3482 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3483                                   struct sk_buff *skb)
3484 {
3485         struct ieee80211_rx_status *rx_status;
3486         struct ieee80211_mgmt *mgmt;
3487         u16 fc;
3488         struct ieee802_11_elems elems;
3489         int ies_len;
3490
3491         rx_status = (struct ieee80211_rx_status *) skb->cb;
3492         mgmt = (struct ieee80211_mgmt *) skb->data;
3493         fc = le16_to_cpu(mgmt->frame_control);
3494
3495         sdata_lock(sdata);
3496
3497         switch (fc & IEEE80211_FCTL_STYPE) {
3498         case IEEE80211_STYPE_BEACON:
3499                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3500                 break;
3501         case IEEE80211_STYPE_PROBE_RESP:
3502                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3503                 break;
3504         case IEEE80211_STYPE_AUTH:
3505                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3506                 break;
3507         case IEEE80211_STYPE_DEAUTH:
3508                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3509                 break;
3510         case IEEE80211_STYPE_DISASSOC:
3511                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3512                 break;
3513         case IEEE80211_STYPE_ASSOC_RESP:
3514         case IEEE80211_STYPE_REASSOC_RESP:
3515                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3516                 break;
3517         case IEEE80211_STYPE_ACTION:
3518                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3519                         ies_len = skb->len -
3520                                   offsetof(struct ieee80211_mgmt,
3521                                            u.action.u.chan_switch.variable);
3522
3523                         if (ies_len < 0)
3524                                 break;
3525
3526                         ieee802_11_parse_elems(
3527                                 mgmt->u.action.u.chan_switch.variable,
3528                                 ies_len, true, &elems);
3529
3530                         if (elems.parse_error)
3531                                 break;
3532
3533                         ieee80211_sta_process_chanswitch(sdata,
3534                                                  rx_status->mactime,
3535                                                  rx_status->device_timestamp,
3536                                                  &elems, false);
3537                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3538                         ies_len = skb->len -
3539                                   offsetof(struct ieee80211_mgmt,
3540                                            u.action.u.ext_chan_switch.variable);
3541
3542                         if (ies_len < 0)
3543                                 break;
3544
3545                         ieee802_11_parse_elems(
3546                                 mgmt->u.action.u.ext_chan_switch.variable,
3547                                 ies_len, true, &elems);
3548
3549                         if (elems.parse_error)
3550                                 break;
3551
3552                         /* for the handling code pretend this was also an IE */
3553                         elems.ext_chansw_ie =
3554                                 &mgmt->u.action.u.ext_chan_switch.data;
3555
3556                         ieee80211_sta_process_chanswitch(sdata,
3557                                                  rx_status->mactime,
3558                                                  rx_status->device_timestamp,
3559                                                  &elems, false);
3560                 }
3561                 break;
3562         }
3563         sdata_unlock(sdata);
3564 }
3565
3566 static void ieee80211_sta_timer(unsigned long data)
3567 {
3568         struct ieee80211_sub_if_data *sdata =
3569                 (struct ieee80211_sub_if_data *) data;
3570
3571         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3572 }
3573
3574 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3575                                           u8 *bssid, u8 reason, bool tx)
3576 {
3577         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3578
3579         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3580                                tx, frame_buf);
3581
3582         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3583                               IEEE80211_DEAUTH_FRAME_LEN);
3584 }
3585
3586 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3587 {
3588         struct ieee80211_local *local = sdata->local;
3589         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3590         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3591         u32 tx_flags = 0;
3592
3593         sdata_assert_lock(sdata);
3594
3595         if (WARN_ON_ONCE(!auth_data))
3596                 return -EINVAL;
3597
3598         auth_data->tries++;
3599
3600         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3601                 sdata_info(sdata, "authentication with %pM timed out\n",
3602                            auth_data->bss->bssid);
3603
3604                 /*
3605                  * Most likely AP is not in the range so remove the
3606                  * bss struct for that AP.
3607                  */
3608                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3609
3610                 return -ETIMEDOUT;
3611         }
3612
3613         drv_mgd_prepare_tx(local, sdata);
3614
3615         if (auth_data->bss->proberesp_ies) {
3616                 u16 trans = 1;
3617                 u16 status = 0;
3618
3619                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3620                            auth_data->bss->bssid, auth_data->tries,
3621                            IEEE80211_AUTH_MAX_TRIES);
3622
3623                 auth_data->expected_transaction = 2;
3624
3625                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3626                         trans = auth_data->sae_trans;
3627                         status = auth_data->sae_status;
3628                         auth_data->expected_transaction = trans;
3629                 }
3630
3631                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3632                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3633                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3634
3635                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3636                                     auth_data->data, auth_data->data_len,
3637                                     auth_data->bss->bssid,
3638                                     auth_data->bss->bssid, NULL, 0, 0,
3639                                     tx_flags);
3640         } else {
3641                 const u8 *ssidie;
3642
3643                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3644                            auth_data->bss->bssid, auth_data->tries,
3645                            IEEE80211_AUTH_MAX_TRIES);
3646
3647                 rcu_read_lock();
3648                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3649                 if (!ssidie) {
3650                         rcu_read_unlock();
3651                         return -EINVAL;
3652                 }
3653                 /*
3654                  * Direct probe is sent to broadcast address as some APs
3655                  * will not answer to direct packet in unassociated state.
3656                  */
3657                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
3658                                          ssidie + 2, ssidie[1],
3659                                          NULL, 0, (u32) -1, true, 0,
3660                                          auth_data->bss->channel, false);
3661                 rcu_read_unlock();
3662         }
3663
3664         if (tx_flags == 0) {
3665                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3666                 auth_data->timeout_started = true;
3667                 run_again(sdata, auth_data->timeout);
3668         } else {
3669                 auth_data->timeout =
3670                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3671                 auth_data->timeout_started = true;
3672                 run_again(sdata, auth_data->timeout);
3673         }
3674
3675         return 0;
3676 }
3677
3678 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3679 {
3680         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3681         struct ieee80211_local *local = sdata->local;
3682
3683         sdata_assert_lock(sdata);
3684
3685         assoc_data->tries++;
3686         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3687                 sdata_info(sdata, "association with %pM timed out\n",
3688                            assoc_data->bss->bssid);
3689
3690                 /*
3691                  * Most likely AP is not in the range so remove the
3692                  * bss struct for that AP.
3693                  */
3694                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3695
3696                 return -ETIMEDOUT;
3697         }
3698
3699         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3700                    assoc_data->bss->bssid, assoc_data->tries,
3701                    IEEE80211_ASSOC_MAX_TRIES);
3702         ieee80211_send_assoc(sdata);
3703
3704         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3705                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3706                 assoc_data->timeout_started = true;
3707                 run_again(sdata, assoc_data->timeout);
3708         } else {
3709                 assoc_data->timeout =
3710                         round_jiffies_up(jiffies +
3711                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3712                 assoc_data->timeout_started = true;
3713                 run_again(sdata, assoc_data->timeout);
3714         }
3715
3716         return 0;
3717 }
3718
3719 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3720                                   __le16 fc, bool acked)
3721 {
3722         struct ieee80211_local *local = sdata->local;
3723
3724         sdata->u.mgd.status_fc = fc;
3725         sdata->u.mgd.status_acked = acked;
3726         sdata->u.mgd.status_received = true;
3727
3728         ieee80211_queue_work(&local->hw, &sdata->work);
3729 }
3730
3731 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3732 {
3733         struct ieee80211_local *local = sdata->local;
3734         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3735
3736         sdata_lock(sdata);
3737
3738         if (ifmgd->status_received) {
3739                 __le16 fc = ifmgd->status_fc;
3740                 bool status_acked = ifmgd->status_acked;
3741
3742                 ifmgd->status_received = false;
3743                 if (ifmgd->auth_data &&
3744                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3745                         if (status_acked) {
3746                                 ifmgd->auth_data->timeout =
3747                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3748                                 run_again(sdata, ifmgd->auth_data->timeout);
3749                         } else {
3750                                 ifmgd->auth_data->timeout = jiffies - 1;
3751                         }
3752                         ifmgd->auth_data->timeout_started = true;
3753                 } else if (ifmgd->assoc_data &&
3754                            (ieee80211_is_assoc_req(fc) ||
3755                             ieee80211_is_reassoc_req(fc))) {
3756                         if (status_acked) {
3757                                 ifmgd->assoc_data->timeout =
3758                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3759                                 run_again(sdata, ifmgd->assoc_data->timeout);
3760                         } else {
3761                                 ifmgd->assoc_data->timeout = jiffies - 1;
3762                         }
3763                         ifmgd->assoc_data->timeout_started = true;
3764                 }
3765         }
3766
3767         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3768             time_after(jiffies, ifmgd->auth_data->timeout)) {
3769                 if (ifmgd->auth_data->done) {
3770                         /*
3771                          * ok ... we waited for assoc but userspace didn't,
3772                          * so let's just kill the auth data
3773                          */
3774                         ieee80211_destroy_auth_data(sdata, false);
3775                 } else if (ieee80211_probe_auth(sdata)) {
3776                         u8 bssid[ETH_ALEN];
3777
3778                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3779
3780                         ieee80211_destroy_auth_data(sdata, false);
3781
3782                         cfg80211_auth_timeout(sdata->dev, bssid);
3783                 }
3784         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3785                 run_again(sdata, ifmgd->auth_data->timeout);
3786
3787         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3788             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3789                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3790                     ieee80211_do_assoc(sdata)) {
3791                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3792
3793                         ieee80211_destroy_assoc_data(sdata, false);
3794                         cfg80211_assoc_timeout(sdata->dev, bss);
3795                 }
3796         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3797                 run_again(sdata, ifmgd->assoc_data->timeout);
3798
3799         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3800             ifmgd->associated) {
3801                 u8 bssid[ETH_ALEN];
3802                 int max_tries;
3803
3804                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3805
3806                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3807                         max_tries = max_nullfunc_tries;
3808                 else
3809                         max_tries = max_probe_tries;
3810
3811                 /* ACK received for nullfunc probing frame */
3812                 if (!ifmgd->probe_send_count)
3813                         ieee80211_reset_ap_probe(sdata);
3814                 else if (ifmgd->nullfunc_failed) {
3815                         if (ifmgd->probe_send_count < max_tries) {
3816                                 mlme_dbg(sdata,
3817                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3818                                          bssid, ifmgd->probe_send_count,
3819                                          max_tries);
3820                                 ieee80211_mgd_probe_ap_send(sdata);
3821                         } else {
3822                                 mlme_dbg(sdata,
3823                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3824                                          bssid);
3825                                 ieee80211_sta_connection_lost(sdata, bssid,
3826                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3827                                         false);
3828                         }
3829                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3830                         run_again(sdata, ifmgd->probe_timeout);
3831                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3832                         mlme_dbg(sdata,
3833                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3834                                  bssid, probe_wait_ms);
3835                         ieee80211_sta_connection_lost(sdata, bssid,
3836                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3837                 } else if (ifmgd->probe_send_count < max_tries) {
3838                         mlme_dbg(sdata,
3839                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3840                                  bssid, probe_wait_ms,
3841                                  ifmgd->probe_send_count, max_tries);
3842                         ieee80211_mgd_probe_ap_send(sdata);
3843                 } else {
3844                         /*
3845                          * We actually lost the connection ... or did we?
3846                          * Let's make sure!
3847                          */
3848                         wiphy_debug(local->hw.wiphy,
3849                                     "%s: No probe response from AP %pM"
3850                                     " after %dms, disconnecting.\n",
3851                                     sdata->name,
3852                                     bssid, probe_wait_ms);
3853
3854                         ieee80211_sta_connection_lost(sdata, bssid,
3855                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3856                 }
3857         }
3858
3859         sdata_unlock(sdata);
3860 }
3861
3862 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3863 {
3864         struct ieee80211_sub_if_data *sdata =
3865                 (struct ieee80211_sub_if_data *) data;
3866         struct ieee80211_local *local = sdata->local;
3867         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3868
3869         if (local->quiescing)
3870                 return;
3871
3872         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3873                 return;
3874
3875         sdata->u.mgd.connection_loss = false;
3876         ieee80211_queue_work(&sdata->local->hw,
3877                              &sdata->u.mgd.beacon_connection_loss_work);
3878 }
3879
3880 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3881 {
3882         struct ieee80211_sub_if_data *sdata =
3883                 (struct ieee80211_sub_if_data *) data;
3884         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3885         struct ieee80211_local *local = sdata->local;
3886
3887         if (local->quiescing)
3888                 return;
3889
3890         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3891                 return;
3892
3893         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3894 }
3895
3896 static void ieee80211_sta_monitor_work(struct work_struct *work)
3897 {
3898         struct ieee80211_sub_if_data *sdata =
3899                 container_of(work, struct ieee80211_sub_if_data,
3900                              u.mgd.monitor_work);
3901
3902         ieee80211_mgd_probe_ap(sdata, false);
3903 }
3904
3905 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3906 {
3907         u32 flags;
3908
3909         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3910                 __ieee80211_stop_poll(sdata);
3911
3912                 /* let's probe the connection once */
3913                 flags = sdata->local->hw.flags;
3914                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3915                         ieee80211_queue_work(&sdata->local->hw,
3916                                              &sdata->u.mgd.monitor_work);
3917                 /* and do all the other regular work too */
3918                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3919         }
3920 }
3921
3922 #ifdef CONFIG_PM
3923 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3924 {
3925         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3926         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3927
3928         sdata_lock(sdata);
3929
3930         if (ifmgd->auth_data || ifmgd->assoc_data) {
3931                 const u8 *bssid = ifmgd->auth_data ?
3932                                 ifmgd->auth_data->bss->bssid :
3933                                 ifmgd->assoc_data->bss->bssid;
3934
3935                 /*
3936                  * If we are trying to authenticate / associate while suspending,
3937                  * cfg80211 won't know and won't actually abort those attempts,
3938                  * thus we need to do that ourselves.
3939                  */
3940                 ieee80211_send_deauth_disassoc(sdata, bssid,
3941                                                IEEE80211_STYPE_DEAUTH,
3942                                                WLAN_REASON_DEAUTH_LEAVING,
3943                                                false, frame_buf);
3944                 if (ifmgd->assoc_data)
3945                         ieee80211_destroy_assoc_data(sdata, false);
3946                 if (ifmgd->auth_data)
3947                         ieee80211_destroy_auth_data(sdata, false);
3948                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3949                                       IEEE80211_DEAUTH_FRAME_LEN);
3950         }
3951
3952         sdata_unlock(sdata);
3953 }
3954
3955 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3956 {
3957         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3958
3959         sdata_lock(sdata);
3960         if (!ifmgd->associated) {
3961                 sdata_unlock(sdata);
3962                 return;
3963         }
3964
3965         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3966                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3967                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3968                 ieee80211_sta_connection_lost(sdata,
3969                                               ifmgd->associated->bssid,
3970                                               WLAN_REASON_UNSPECIFIED,
3971                                               true);
3972                 sdata_unlock(sdata);
3973                 return;
3974         }
3975         sdata_unlock(sdata);
3976 }
3977 #endif
3978
3979 /* interface setup */
3980 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3981 {
3982         struct ieee80211_if_managed *ifmgd;
3983
3984         ifmgd = &sdata->u.mgd;
3985         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3986         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3987         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3988                   ieee80211_beacon_connection_loss_work);
3989         INIT_WORK(&ifmgd->csa_connection_drop_work,
3990                   ieee80211_csa_connection_drop_work);
3991         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3992         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
3993                           ieee80211_tdls_peer_del_work);
3994         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3995                     (unsigned long) sdata);
3996         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3997                     (unsigned long) sdata);
3998         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3999                     (unsigned long) sdata);
4000         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4001                     (unsigned long) sdata);
4002         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4003                           ieee80211_sta_handle_tspec_ac_params_wk);
4004
4005         ifmgd->flags = 0;
4006         ifmgd->powersave = sdata->wdev.ps;
4007         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4008         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4009         ifmgd->p2p_noa_index = -1;
4010
4011         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4012                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4013         else
4014                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4015
4016         /* Setup TDLS data */
4017         spin_lock_init(&ifmgd->teardown_lock);
4018         ifmgd->teardown_skb = NULL;
4019         ifmgd->orig_teardown_skb = NULL;
4020 }
4021
4022 /* scan finished notification */
4023 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4024 {
4025         struct ieee80211_sub_if_data *sdata;
4026
4027         /* Restart STA timers */
4028         rcu_read_lock();
4029         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4030                 if (ieee80211_sdata_running(sdata))
4031                         ieee80211_restart_sta_timer(sdata);
4032         }
4033         rcu_read_unlock();
4034 }
4035
4036 int ieee80211_max_network_latency(struct notifier_block *nb,
4037                                   unsigned long data, void *dummy)
4038 {
4039         s32 latency_usec = (s32) data;
4040         struct ieee80211_local *local =
4041                 container_of(nb, struct ieee80211_local,
4042                              network_latency_notifier);
4043
4044         mutex_lock(&local->iflist_mtx);
4045         ieee80211_recalc_ps(local, latency_usec);
4046         mutex_unlock(&local->iflist_mtx);
4047
4048         return NOTIFY_OK;
4049 }
4050
4051 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4052                                      struct cfg80211_bss *cbss)
4053 {
4054         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4055         const u8 *ht_cap_ie, *vht_cap_ie;
4056         const struct ieee80211_ht_cap *ht_cap;
4057         const struct ieee80211_vht_cap *vht_cap;
4058         u8 chains = 1;
4059
4060         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4061                 return chains;
4062
4063         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4064         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4065                 ht_cap = (void *)(ht_cap_ie + 2);
4066                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4067                 /*
4068                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4069                  *       "Tx Unequal Modulation Supported" fields.
4070                  */
4071         }
4072
4073         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4074                 return chains;
4075
4076         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4077         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4078                 u8 nss;
4079                 u16 tx_mcs_map;
4080
4081                 vht_cap = (void *)(vht_cap_ie + 2);
4082                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4083                 for (nss = 8; nss > 0; nss--) {
4084                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4085                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4086                                 break;
4087                 }
4088                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4089                 chains = max(chains, nss);
4090         }
4091
4092         return chains;
4093 }
4094
4095 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4096                                   struct cfg80211_bss *cbss)
4097 {
4098         struct ieee80211_local *local = sdata->local;
4099         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4100         const struct ieee80211_ht_cap *ht_cap = NULL;
4101         const struct ieee80211_ht_operation *ht_oper = NULL;
4102         const struct ieee80211_vht_operation *vht_oper = NULL;
4103         struct ieee80211_supported_band *sband;
4104         struct cfg80211_chan_def chandef;
4105         int ret;
4106
4107         sband = local->hw.wiphy->bands[cbss->channel->band];
4108
4109         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4110                           IEEE80211_STA_DISABLE_80P80MHZ |
4111                           IEEE80211_STA_DISABLE_160MHZ);
4112
4113         rcu_read_lock();
4114
4115         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4116             sband->ht_cap.ht_supported) {
4117                 const u8 *ht_oper_ie, *ht_cap_ie;
4118
4119                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4120                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4121                         ht_oper = (void *)(ht_oper_ie + 2);
4122
4123                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4124                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4125                         ht_cap = (void *)(ht_cap_ie + 2);
4126
4127                 if (!ht_cap) {
4128                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4129                         ht_oper = NULL;
4130                 }
4131         }
4132
4133         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4134             sband->vht_cap.vht_supported) {
4135                 const u8 *vht_oper_ie, *vht_cap;
4136
4137                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4138                                                    WLAN_EID_VHT_OPERATION);
4139                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4140                         vht_oper = (void *)(vht_oper_ie + 2);
4141                 if (vht_oper && !ht_oper) {
4142                         vht_oper = NULL;
4143                         sdata_info(sdata,
4144                                    "AP advertised VHT without HT, disabling both\n");
4145                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4146                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4147                 }
4148
4149                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4150                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4151                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4152                         vht_oper = NULL;
4153                 }
4154         }
4155
4156         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4157                                                      cbss->channel,
4158                                                      ht_cap, ht_oper, vht_oper,
4159                                                      &chandef, false);
4160
4161         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4162                                       local->rx_chains);
4163
4164         rcu_read_unlock();
4165
4166         /* will change later if needed */
4167         sdata->smps_mode = IEEE80211_SMPS_OFF;
4168
4169         mutex_lock(&local->mtx);
4170         /*
4171          * If this fails (possibly due to channel context sharing
4172          * on incompatible channels, e.g. 80+80 and 160 sharing the
4173          * same control channel) try to use a smaller bandwidth.
4174          */
4175         ret = ieee80211_vif_use_channel(sdata, &chandef,
4176                                         IEEE80211_CHANCTX_SHARED);
4177
4178         /* don't downgrade for 5 and 10 MHz channels, though. */
4179         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4180             chandef.width == NL80211_CHAN_WIDTH_10)
4181                 goto out;
4182
4183         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4184                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4185                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4186                                                 IEEE80211_CHANCTX_SHARED);
4187         }
4188  out:
4189         mutex_unlock(&local->mtx);
4190         return ret;
4191 }
4192
4193 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4194                                      struct cfg80211_bss *cbss, bool assoc)
4195 {
4196         struct ieee80211_local *local = sdata->local;
4197         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4198         struct ieee80211_bss *bss = (void *)cbss->priv;
4199         struct sta_info *new_sta = NULL;
4200         bool have_sta = false;
4201         int err;
4202
4203         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4204                 return -EINVAL;
4205
4206         if (assoc) {
4207                 rcu_read_lock();
4208                 have_sta = sta_info_get(sdata, cbss->bssid);
4209                 rcu_read_unlock();
4210         }
4211
4212         if (!have_sta) {
4213                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4214                 if (!new_sta)
4215                         return -ENOMEM;
4216         }
4217         if (new_sta) {
4218                 u32 rates = 0, basic_rates = 0;
4219                 bool have_higher_than_11mbit;
4220                 int min_rate = INT_MAX, min_rate_index = -1;
4221                 struct ieee80211_chanctx_conf *chanctx_conf;
4222                 struct ieee80211_supported_band *sband;
4223                 const struct cfg80211_bss_ies *ies;
4224                 int shift;
4225                 u32 rate_flags;
4226
4227                 sband = local->hw.wiphy->bands[cbss->channel->band];
4228
4229                 err = ieee80211_prep_channel(sdata, cbss);
4230                 if (err) {
4231                         sta_info_free(local, new_sta);
4232                         return -EINVAL;
4233                 }
4234                 shift = ieee80211_vif_get_shift(&sdata->vif);
4235
4236                 rcu_read_lock();
4237                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4238                 if (WARN_ON(!chanctx_conf)) {
4239                         rcu_read_unlock();
4240                         sta_info_free(local, new_sta);
4241                         return -EINVAL;
4242                 }
4243                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4244                 rcu_read_unlock();
4245
4246                 ieee80211_get_rates(sband, bss->supp_rates,
4247                                     bss->supp_rates_len,
4248                                     &rates, &basic_rates,
4249                                     &have_higher_than_11mbit,
4250                                     &min_rate, &min_rate_index,
4251                                     shift, rate_flags);
4252
4253                 /*
4254                  * This used to be a workaround for basic rates missing
4255                  * in the association response frame. Now that we no
4256                  * longer use the basic rates from there, it probably
4257                  * doesn't happen any more, but keep the workaround so
4258                  * in case some *other* APs are buggy in different ways
4259                  * we can connect -- with a warning.
4260                  */
4261                 if (!basic_rates && min_rate_index >= 0) {
4262                         sdata_info(sdata,
4263                                    "No basic rates, using min rate instead\n");
4264                         basic_rates = BIT(min_rate_index);
4265                 }
4266
4267                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4268                 sdata->vif.bss_conf.basic_rates = basic_rates;
4269
4270                 /* cf. IEEE 802.11 9.2.12 */
4271                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4272                     have_higher_than_11mbit)
4273                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4274                 else
4275                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4276
4277                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4278
4279                 /* set timing information */
4280                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4281                 rcu_read_lock();
4282                 ies = rcu_dereference(cbss->beacon_ies);
4283                 if (ies) {
4284                         const u8 *tim_ie;
4285
4286                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4287                         sdata->vif.bss_conf.sync_device_ts =
4288                                 bss->device_ts_beacon;
4289                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4290                                                   ies->data, ies->len);
4291                         if (tim_ie && tim_ie[1] >= 2)
4292                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4293                         else
4294                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4295                 } else if (!(local->hw.flags &
4296                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4297                         ies = rcu_dereference(cbss->proberesp_ies);
4298                         /* must be non-NULL since beacon IEs were NULL */
4299                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4300                         sdata->vif.bss_conf.sync_device_ts =
4301                                 bss->device_ts_presp;
4302                         sdata->vif.bss_conf.sync_dtim_count = 0;
4303                 } else {
4304                         sdata->vif.bss_conf.sync_tsf = 0;
4305                         sdata->vif.bss_conf.sync_device_ts = 0;
4306                         sdata->vif.bss_conf.sync_dtim_count = 0;
4307                 }
4308                 rcu_read_unlock();
4309
4310                 /* tell driver about BSSID, basic rates and timing */
4311                 ieee80211_bss_info_change_notify(sdata,
4312                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4313                         BSS_CHANGED_BEACON_INT);
4314
4315                 if (assoc)
4316                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4317
4318                 err = sta_info_insert(new_sta);
4319                 new_sta = NULL;
4320                 if (err) {
4321                         sdata_info(sdata,
4322                                    "failed to insert STA entry for the AP (error %d)\n",
4323                                    err);
4324                         return err;
4325                 }
4326         } else
4327                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4328
4329         return 0;
4330 }
4331
4332 /* config hooks */
4333 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4334                        struct cfg80211_auth_request *req)
4335 {
4336         struct ieee80211_local *local = sdata->local;
4337         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4338         struct ieee80211_mgd_auth_data *auth_data;
4339         u16 auth_alg;
4340         int err;
4341
4342         /* prepare auth data structure */
4343
4344         switch (req->auth_type) {
4345         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4346                 auth_alg = WLAN_AUTH_OPEN;
4347                 break;
4348         case NL80211_AUTHTYPE_SHARED_KEY:
4349                 if (IS_ERR(local->wep_tx_tfm))
4350                         return -EOPNOTSUPP;
4351                 auth_alg = WLAN_AUTH_SHARED_KEY;
4352                 break;
4353         case NL80211_AUTHTYPE_FT:
4354                 auth_alg = WLAN_AUTH_FT;
4355                 break;
4356         case NL80211_AUTHTYPE_NETWORK_EAP:
4357                 auth_alg = WLAN_AUTH_LEAP;
4358                 break;
4359         case NL80211_AUTHTYPE_SAE:
4360                 auth_alg = WLAN_AUTH_SAE;
4361                 break;
4362         default:
4363                 return -EOPNOTSUPP;
4364         }
4365
4366         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4367                             req->ie_len, GFP_KERNEL);
4368         if (!auth_data)
4369                 return -ENOMEM;
4370
4371         auth_data->bss = req->bss;
4372
4373         if (req->sae_data_len >= 4) {
4374                 __le16 *pos = (__le16 *) req->sae_data;
4375                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4376                 auth_data->sae_status = le16_to_cpu(pos[1]);
4377                 memcpy(auth_data->data, req->sae_data + 4,
4378                        req->sae_data_len - 4);
4379                 auth_data->data_len += req->sae_data_len - 4;
4380         }
4381
4382         if (req->ie && req->ie_len) {
4383                 memcpy(&auth_data->data[auth_data->data_len],
4384                        req->ie, req->ie_len);
4385                 auth_data->data_len += req->ie_len;
4386         }
4387
4388         if (req->key && req->key_len) {
4389                 auth_data->key_len = req->key_len;
4390                 auth_data->key_idx = req->key_idx;
4391                 memcpy(auth_data->key, req->key, req->key_len);
4392         }
4393
4394         auth_data->algorithm = auth_alg;
4395
4396         /* try to authenticate/probe */
4397
4398         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4399             ifmgd->assoc_data) {
4400                 err = -EBUSY;
4401                 goto err_free;
4402         }
4403
4404         if (ifmgd->auth_data)
4405                 ieee80211_destroy_auth_data(sdata, false);
4406
4407         /* prep auth_data so we don't go into idle on disassoc */
4408         ifmgd->auth_data = auth_data;
4409
4410         if (ifmgd->associated) {
4411                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4412
4413                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4414                                        WLAN_REASON_UNSPECIFIED,
4415                                        false, frame_buf);
4416
4417                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4418                                       sizeof(frame_buf));
4419         }
4420
4421         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4422
4423         err = ieee80211_prep_connection(sdata, req->bss, false);
4424         if (err)
4425                 goto err_clear;
4426
4427         err = ieee80211_probe_auth(sdata);
4428         if (err) {
4429                 sta_info_destroy_addr(sdata, req->bss->bssid);
4430                 goto err_clear;
4431         }
4432
4433         /* hold our own reference */
4434         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4435         return 0;
4436
4437  err_clear:
4438         memset(ifmgd->bssid, 0, ETH_ALEN);
4439         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4440         ifmgd->auth_data = NULL;
4441  err_free:
4442         kfree(auth_data);
4443         return err;
4444 }
4445
4446 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4447                                         const u8 *wmm_param, int len)
4448 {
4449         const u8 *pos;
4450         size_t left;
4451
4452         if (len < 8)
4453                 return false;
4454
4455         if (wmm_param[5] != 1 /* version */)
4456                 return false;
4457
4458         pos = wmm_param + 8;
4459         left = len - 8;
4460
4461         for (; left >= 4; left -= 4, pos += 4) {
4462                 u8 aifsn = pos[0] & 0x0f;
4463                 u8 ecwmin = pos[1] & 0x0f;
4464                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4465                 int aci = (pos[0] >> 5) & 0x03;
4466
4467                 if (aifsn < 2) {
4468                         sdata_info(sdata,
4469                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4470                                    aifsn, aci);
4471                         return false;
4472                 }
4473                 if (ecwmin > ecwmax) {
4474                         sdata_info(sdata,
4475                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4476                                    ecwmin, ecwmax, aci);
4477                         return false;
4478                 }
4479         }
4480
4481         return true;
4482 }
4483
4484 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4485                         struct cfg80211_assoc_request *req)
4486 {
4487         struct ieee80211_local *local = sdata->local;
4488         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4489         struct ieee80211_bss *bss = (void *)req->bss->priv;
4490         struct ieee80211_mgd_assoc_data *assoc_data;
4491         const struct cfg80211_bss_ies *beacon_ies;
4492         struct ieee80211_supported_band *sband;
4493         const u8 *ssidie, *ht_ie, *vht_ie;
4494         int i, err;
4495
4496         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4497         if (!assoc_data)
4498                 return -ENOMEM;
4499
4500         rcu_read_lock();
4501         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4502         if (!ssidie) {
4503                 rcu_read_unlock();
4504                 kfree(assoc_data);
4505                 return -EINVAL;
4506         }
4507         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4508         assoc_data->ssid_len = ssidie[1];
4509         rcu_read_unlock();
4510
4511         if (ifmgd->associated) {
4512                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4513
4514                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4515                                        WLAN_REASON_UNSPECIFIED,
4516                                        false, frame_buf);
4517
4518                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4519                                       sizeof(frame_buf));
4520         }
4521
4522         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4523                 err = -EBUSY;
4524                 goto err_free;
4525         }
4526
4527         if (ifmgd->assoc_data) {
4528                 err = -EBUSY;
4529                 goto err_free;
4530         }
4531
4532         if (ifmgd->auth_data) {
4533                 bool match;
4534
4535                 /* keep sta info, bssid if matching */
4536                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4537                 ieee80211_destroy_auth_data(sdata, match);
4538         }
4539
4540         /* prepare assoc data */
4541
4542         ifmgd->beacon_crc_valid = false;
4543
4544         assoc_data->wmm = bss->wmm_used &&
4545                           (local->hw.queues >= IEEE80211_NUM_ACS);
4546         if (assoc_data->wmm) {
4547                 /* try to check validity of WMM params IE */
4548                 const struct cfg80211_bss_ies *ies;
4549                 const u8 *wp, *start, *end;
4550
4551                 rcu_read_lock();
4552                 ies = rcu_dereference(req->bss->ies);
4553                 start = ies->data;
4554                 end = start + ies->len;
4555
4556                 while (true) {
4557                         wp = cfg80211_find_vendor_ie(
4558                                 WLAN_OUI_MICROSOFT,
4559                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4560                                 start, end - start);
4561                         if (!wp)
4562                                 break;
4563                         start = wp + wp[1] + 2;
4564                         /* if this IE is too short, try the next */
4565                         if (wp[1] <= 4)
4566                                 continue;
4567                         /* if this IE is WMM params, we found what we wanted */
4568                         if (wp[6] == 1)
4569                                 break;
4570                 }
4571
4572                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4573                                                         wp[1] - 2)) {
4574                         assoc_data->wmm = false;
4575                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4576                 }
4577                 rcu_read_unlock();
4578         }
4579
4580         /*
4581          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4582          * We still associate in non-HT mode (11a/b/g) if any one of these
4583          * ciphers is configured as pairwise.
4584          * We can set this to true for non-11n hardware, that'll be checked
4585          * separately along with the peer capabilities.
4586          */
4587         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4588                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4589                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4590                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4591                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4592                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4593                         netdev_info(sdata->dev,
4594                                     "disabling HT/VHT due to WEP/TKIP use\n");
4595                 }
4596         }
4597
4598         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4599                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4600                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4601         }
4602
4603         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4604                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4605
4606         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4607         sband = local->hw.wiphy->bands[req->bss->channel->band];
4608         if (!sband->ht_cap.ht_supported ||
4609             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4610             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4611                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4612                 if (!bss->wmm_used &&
4613                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4614                         netdev_info(sdata->dev,
4615                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4616         }
4617
4618         /* disable VHT if we don't support it or the AP doesn't use WMM */
4619         if (!sband->vht_cap.vht_supported ||
4620             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4621             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4622                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4623                 if (!bss->wmm_used &&
4624                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4625                         netdev_info(sdata->dev,
4626                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4627         }
4628
4629         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4630         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4631                sizeof(ifmgd->ht_capa_mask));
4632
4633         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4634         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4635                sizeof(ifmgd->vht_capa_mask));
4636
4637         if (req->ie && req->ie_len) {
4638                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4639                 assoc_data->ie_len = req->ie_len;
4640         }
4641
4642         assoc_data->bss = req->bss;
4643
4644         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4645                 if (ifmgd->powersave)
4646                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4647                 else
4648                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4649         } else
4650                 sdata->smps_mode = ifmgd->req_smps;
4651
4652         assoc_data->capability = req->bss->capability;
4653         assoc_data->supp_rates = bss->supp_rates;
4654         assoc_data->supp_rates_len = bss->supp_rates_len;
4655
4656         rcu_read_lock();
4657         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4658         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4659                 assoc_data->ap_ht_param =
4660                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4661         else
4662                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4663         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4664         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4665                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4666                        sizeof(struct ieee80211_vht_cap));
4667         else
4668                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4669         rcu_read_unlock();
4670
4671         if (bss->wmm_used && bss->uapsd_supported &&
4672             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4673                 assoc_data->uapsd = true;
4674                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4675         } else {
4676                 assoc_data->uapsd = false;
4677                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4678         }
4679
4680         if (req->prev_bssid)
4681                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4682
4683         if (req->use_mfp) {
4684                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4685                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4686         } else {
4687                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4688                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4689         }
4690
4691         if (req->flags & ASSOC_REQ_USE_RRM)
4692                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4693         else
4694                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4695
4696         if (req->crypto.control_port)
4697                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4698         else
4699                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4700
4701         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4702         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4703         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4704                                                         sdata->vif.type);
4705
4706         /* kick off associate process */
4707
4708         ifmgd->assoc_data = assoc_data;
4709         ifmgd->dtim_period = 0;
4710         ifmgd->have_beacon = false;
4711
4712         err = ieee80211_prep_connection(sdata, req->bss, true);
4713         if (err)
4714                 goto err_clear;
4715
4716         rcu_read_lock();
4717         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4718
4719         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4720             !beacon_ies) {
4721                 /*
4722                  * Wait up to one beacon interval ...
4723                  * should this be more if we miss one?
4724                  */
4725                 sdata_info(sdata, "waiting for beacon from %pM\n",
4726                            ifmgd->bssid);
4727                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4728                 assoc_data->timeout_started = true;
4729                 assoc_data->need_beacon = true;
4730         } else if (beacon_ies) {
4731                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4732                                                     beacon_ies->data,
4733                                                     beacon_ies->len);
4734                 u8 dtim_count = 0;
4735
4736                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4737                         const struct ieee80211_tim_ie *tim;
4738                         tim = (void *)(tim_ie + 2);
4739                         ifmgd->dtim_period = tim->dtim_period;
4740                         dtim_count = tim->dtim_count;
4741                 }
4742                 ifmgd->have_beacon = true;
4743                 assoc_data->timeout = jiffies;
4744                 assoc_data->timeout_started = true;
4745
4746                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4747                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4748                         sdata->vif.bss_conf.sync_device_ts =
4749                                 bss->device_ts_beacon;
4750                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4751                 }
4752         } else {
4753                 assoc_data->timeout = jiffies;
4754                 assoc_data->timeout_started = true;
4755         }
4756         rcu_read_unlock();
4757
4758         run_again(sdata, assoc_data->timeout);
4759
4760         if (bss->corrupt_data) {
4761                 char *corrupt_type = "data";
4762                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4763                         if (bss->corrupt_data &
4764                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4765                                 corrupt_type = "beacon and probe response";
4766                         else
4767                                 corrupt_type = "beacon";
4768                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4769                         corrupt_type = "probe response";
4770                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4771                            corrupt_type);
4772         }
4773
4774         return 0;
4775  err_clear:
4776         memset(ifmgd->bssid, 0, ETH_ALEN);
4777         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4778         ifmgd->assoc_data = NULL;
4779  err_free:
4780         kfree(assoc_data);
4781         return err;
4782 }
4783
4784 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4785                          struct cfg80211_deauth_request *req)
4786 {
4787         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4788         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4789         bool tx = !req->local_state_change;
4790
4791         if (ifmgd->auth_data &&
4792             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4793                 sdata_info(sdata,
4794                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4795                            req->bssid, req->reason_code,
4796                            ieee80211_get_reason_code_string(req->reason_code));
4797
4798                 drv_mgd_prepare_tx(sdata->local, sdata);
4799                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4800                                                IEEE80211_STYPE_DEAUTH,
4801                                                req->reason_code, tx,
4802                                                frame_buf);
4803                 ieee80211_destroy_auth_data(sdata, false);
4804                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4805                                       IEEE80211_DEAUTH_FRAME_LEN);
4806
4807                 return 0;
4808         }
4809
4810         if (ifmgd->associated &&
4811             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4812                 sdata_info(sdata,
4813                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4814                            req->bssid, req->reason_code,
4815                            ieee80211_get_reason_code_string(req->reason_code));
4816
4817                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4818                                        req->reason_code, tx, frame_buf);
4819                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4820                                       IEEE80211_DEAUTH_FRAME_LEN);
4821                 return 0;
4822         }
4823
4824         return -ENOTCONN;
4825 }
4826
4827 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4828                            struct cfg80211_disassoc_request *req)
4829 {
4830         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4831         u8 bssid[ETH_ALEN];
4832         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4833
4834         /*
4835          * cfg80211 should catch this ... but it's racy since
4836          * we can receive a disassoc frame, process it, hand it
4837          * to cfg80211 while that's in a locked section already
4838          * trying to tell us that the user wants to disconnect.
4839          */
4840         if (ifmgd->associated != req->bss)
4841                 return -ENOLINK;
4842
4843         sdata_info(sdata,
4844                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4845                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4846
4847         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4848         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4849                                req->reason_code, !req->local_state_change,
4850                                frame_buf);
4851
4852         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4853                               IEEE80211_DEAUTH_FRAME_LEN);
4854
4855         return 0;
4856 }
4857
4858 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4859 {
4860         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4861
4862         /*
4863          * Make sure some work items will not run after this,
4864          * they will not do anything but might not have been
4865          * cancelled when disconnecting.
4866          */
4867         cancel_work_sync(&ifmgd->monitor_work);
4868         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4869         cancel_work_sync(&ifmgd->request_smps_work);
4870         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4871         cancel_work_sync(&ifmgd->chswitch_work);
4872         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4873
4874         sdata_lock(sdata);
4875         if (ifmgd->assoc_data) {
4876                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4877                 ieee80211_destroy_assoc_data(sdata, false);
4878                 cfg80211_assoc_timeout(sdata->dev, bss);
4879         }
4880         if (ifmgd->auth_data)
4881                 ieee80211_destroy_auth_data(sdata, false);
4882         spin_lock_bh(&ifmgd->teardown_lock);
4883         if (ifmgd->teardown_skb) {
4884                 kfree_skb(ifmgd->teardown_skb);
4885                 ifmgd->teardown_skb = NULL;
4886                 ifmgd->orig_teardown_skb = NULL;
4887         }
4888         spin_unlock_bh(&ifmgd->teardown_lock);
4889         del_timer_sync(&ifmgd->timer);
4890         sdata_unlock(sdata);
4891 }
4892
4893 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4894                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4895                                gfp_t gfp)
4896 {
4897         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4898
4899         trace_api_cqm_rssi_notify(sdata, rssi_event);
4900
4901         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4902 }
4903 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
4904
4905 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
4906 {
4907         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4908
4909         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
4910
4911         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
4912 }
4913 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);