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  * Copyright (C) 2015 - 2016 Intel Deutschland GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/delay.h>
  17 #include <linux/if_ether.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/rtnetlink.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  * How many Beacon frames need to have been used in average signal strength
  85  * before starting to indicate signal change events.
  86  */
  87 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  88
  89 /*
  90  * We can have multiple work items (and connection probing)
  91  * scheduling this timer, but we need to take care to only
  92  * reschedule it when it should fire _earlier_ than it was
  93  * asked for before, or if it's not pending right now. This
  94  * function ensures that. Note that it then is required to
  95  * run this function for all timeouts after the first one
  96  * has happened -- the work that runs from this timer will
  97  * do that.
  98  */
  99 static void run_again(struct ieee80211_sub_if_data *sdata,
 100                       unsigned long timeout)
 101 {
 102         sdata_assert_lock(sdata);
 103
 104         if (!timer_pending(&sdata->u.mgd.timer) ||
 105             time_before(timeout, sdata->u.mgd.timer.expires))
 106                 mod_timer(&sdata->u.mgd.timer, timeout);
 107 }
 108
 109 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 110 {
 111         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 112                 return;
 113
 114         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 115                 return;
 116
 117         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 118                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 119 }
 120
 121 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 122 {
 123         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 124
 125         if (unlikely(!ifmgd->associated))
 126                 return;
 127
 128         if (ifmgd->probe_send_count)
 129                 ifmgd->probe_send_count = 0;
 130
 131         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 132                 return;
 133
 134         mod_timer(&ifmgd->conn_mon_timer,
 135                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 136 }
 137
 138 static int ecw2cw(int ecw)
 139 {
 140         return (1 << ecw) - 1;
 141 }
 142
 143 static u32
 144 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 145                              struct ieee80211_supported_band *sband,
 146                              struct ieee80211_channel *channel,
 147                              const struct ieee80211_ht_cap *ht_cap,
 148                              const struct ieee80211_ht_operation *ht_oper,
 149                              const struct ieee80211_vht_operation *vht_oper,
 150                              struct cfg80211_chan_def *chandef, bool tracking)
 151 {
 152         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 153         struct cfg80211_chan_def vht_chandef;
 154         struct ieee80211_sta_ht_cap sta_ht_cap;
 155         u32 ht_cfreq, ret;
 156
 157         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 158         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 159
 160         chandef->chan = channel;
 161         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 162         chandef->center_freq1 = channel->center_freq;
 163         chandef->center_freq2 = 0;
 164
 165         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 166                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 167                 goto out;
 168         }
 169
 170         chandef->width = NL80211_CHAN_WIDTH_20;
 171
 172         if (!(ht_cap->cap_info &
 173               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 174                 ret = IEEE80211_STA_DISABLE_40MHZ;
 175                 vht_chandef = *chandef;
 176                 goto out;
 177         }
 178
 179         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 180                                                   channel->band);
 181         /* check that channel matches the right operating channel */
 182         if (!tracking && channel->center_freq != ht_cfreq) {
 183                 /*
 184                  * It's possible that some APs are confused here;
 185                  * Netgear WNDR3700 sometimes reports 4 higher than
 186                  * the actual channel in association responses, but
 187                  * since we look at probe response/beacon data here
 188                  * it should be OK.
 189                  */
 190                 sdata_info(sdata,
 191                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 192                            channel->center_freq, ht_cfreq,
 193                            ht_oper->primary_chan, channel->band);
 194                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 195                 goto out;
 196         }
 197
 198         /* check 40 MHz support, if we have it */
 199         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 200                 ieee80211_chandef_ht_oper(ht_oper, chandef);
 201         } else {
 202                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 203                 ret = IEEE80211_STA_DISABLE_VHT;
 204                 /* also mark 40 MHz disabled */
 205                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 206                 goto out;
 207         }
 208
 209         if (!vht_oper || !sband->vht_cap.vht_supported) {
 210                 ret = IEEE80211_STA_DISABLE_VHT;
 211                 goto out;
 212         }
 213
 214         vht_chandef = *chandef;
 215         if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
 216                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 217                         sdata_info(sdata,
 218                                    "AP VHT information is invalid, disable VHT\n");
 219                 ret = IEEE80211_STA_DISABLE_VHT;
 220                 goto out;
 221         }
 222
 223         if (!cfg80211_chandef_valid(&vht_chandef)) {
 224                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 225                         sdata_info(sdata,
 226                                    "AP VHT information is invalid, disable VHT\n");
 227                 ret = IEEE80211_STA_DISABLE_VHT;
 228                 goto out;
 229         }
 230
 231         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 232                 ret = 0;
 233                 goto out;
 234         }
 235
 236         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 237                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 238                         sdata_info(sdata,
 239                                    "AP VHT information doesn't match HT, disable VHT\n");
 240                 ret = IEEE80211_STA_DISABLE_VHT;
 241                 goto out;
 242         }
 243
 244         *chandef = vht_chandef;
 245
 246         ret = 0;
 247
 248 out:
 249         /*
 250          * When tracking the current AP, don't do any further checks if the
 251          * new chandef is identical to the one we're currently using for the
 252          * connection. This keeps us from playing ping-pong with regulatory,
 253          * without it the following can happen (for example):
 254          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 255          *  - AP advertises regdom US
 256          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 257          *  - the code below detects an unsupported channel, downgrades, and
 258          *    we disconnect from the AP in the caller
 259          *  - disconnect causes CRDA to reload world regdomain and the game
 260          *    starts anew.
 261          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 262          *
 263          * It seems possible that there are still scenarios with CSA or real
 264          * bandwidth changes where a this could happen, but those cases are
 265          * less common and wouldn't completely prevent using the AP.
 266          */
 267         if (tracking &&
 268             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 269                 return ret;
 270
 271         /* don't print the message below for VHT mismatch if VHT is disabled */
 272         if (ret & IEEE80211_STA_DISABLE_VHT)
 273                 vht_chandef = *chandef;
 274
 275         /*
 276          * Ignore the DISABLED flag when we're already connected and only
 277          * tracking the APs beacon for bandwidth changes - otherwise we
 278          * might get disconnected here if we connect to an AP, update our
 279          * regulatory information based on the AP's country IE and the
 280          * information we have is wrong/outdated and disables the channel
 281          * that we're actually using for the connection to the AP.
 282          */
 283         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 284                                         tracking ? 0 :
 285                                                    IEEE80211_CHAN_DISABLED)) {
 286                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 287                         ret = IEEE80211_STA_DISABLE_HT |
 288                               IEEE80211_STA_DISABLE_VHT;
 289                         break;
 290                 }
 291
 292                 ret |= ieee80211_chandef_downgrade(chandef);
 293         }
 294
 295         if (chandef->width != vht_chandef.width && !tracking)
 296                 sdata_info(sdata,
 297                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 298
 299         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 300         return ret;
 301 }
 302
 303 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 304                                struct sta_info *sta,
 305                                const struct ieee80211_ht_cap *ht_cap,
 306                                const struct ieee80211_ht_operation *ht_oper,
 307                                const struct ieee80211_vht_operation *vht_oper,
 308                                const u8 *bssid, u32 *changed)
 309 {
 310         struct ieee80211_local *local = sdata->local;
 311         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 312         struct ieee80211_supported_band *sband;
 313         struct ieee80211_channel *chan;
 314         struct cfg80211_chan_def chandef;
 315         u16 ht_opmode;
 316         u32 flags;
 317         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 318         int ret;
 319
 320         /* if HT was/is disabled, don't track any bandwidth changes */
 321         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 322                 return 0;
 323
 324         /* don't check VHT if we associated as non-VHT station */
 325         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 326                 vht_oper = NULL;
 327
 328         if (WARN_ON_ONCE(!sta))
 329                 return -EINVAL;
 330
 331         /*
 332          * if bss configuration changed store the new one -
 333          * this may be applicable even if channel is identical
 334          */
 335         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 336         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 337                 *changed |= BSS_CHANGED_HT;
 338                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 339         }
 340
 341         chan = sdata->vif.bss_conf.chandef.chan;
 342         sband = local->hw.wiphy->bands[chan->band];
 343
 344         /* calculate new channel (type) based on HT/VHT operation IEs */
 345         flags = ieee80211_determine_chantype(sdata, sband, chan,
 346                                              ht_cap, ht_oper, vht_oper,
 347                                              &chandef, true);
 348
 349         /*
 350          * Downgrade the new channel if we associated with restricted
 351          * capabilities. For example, if we associated as a 20 MHz STA
 352          * to a 40 MHz AP (due to regulatory, capabilities or config
 353          * reasons) then switching to a 40 MHz channel now won't do us
 354          * any good -- we couldn't use it with the AP.
 355          */
 356         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 357             chandef.width == NL80211_CHAN_WIDTH_80P80)
 358                 flags |= ieee80211_chandef_downgrade(&chandef);
 359         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 360             chandef.width == NL80211_CHAN_WIDTH_160)
 361                 flags |= ieee80211_chandef_downgrade(&chandef);
 362         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 363             chandef.width > NL80211_CHAN_WIDTH_20)
 364                 flags |= ieee80211_chandef_downgrade(&chandef);
 365
 366         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 367                 return 0;
 368
 369         sdata_info(sdata,
 370                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 371                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 372                    chandef.center_freq1, chandef.center_freq2);
 373
 374         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 375                                       IEEE80211_STA_DISABLE_VHT |
 376                                       IEEE80211_STA_DISABLE_40MHZ |
 377                                       IEEE80211_STA_DISABLE_80P80MHZ |
 378                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 379             !cfg80211_chandef_valid(&chandef)) {
 380                 sdata_info(sdata,
 381                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 382                            ifmgd->bssid);
 383                 return -EINVAL;
 384         }
 385
 386         switch (chandef.width) {
 387         case NL80211_CHAN_WIDTH_20_NOHT:
 388         case NL80211_CHAN_WIDTH_20:
 389                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 390                 break;
 391         case NL80211_CHAN_WIDTH_40:
 392                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 393                 break;
 394         case NL80211_CHAN_WIDTH_80:
 395                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 396                 break;
 397         case NL80211_CHAN_WIDTH_80P80:
 398         case NL80211_CHAN_WIDTH_160:
 399                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 400                 break;
 401         default:
 402                 return -EINVAL;
 403         }
 404
 405         if (new_sta_bw > sta->cur_max_bandwidth)
 406                 new_sta_bw = sta->cur_max_bandwidth;
 407
 408         if (new_sta_bw < sta->sta.bandwidth) {
 409                 sta->sta.bandwidth = new_sta_bw;
 410                 rate_control_rate_update(local, sband, sta,
 411                                          IEEE80211_RC_BW_CHANGED);
 412         }
 413
 414         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 415         if (ret) {
 416                 sdata_info(sdata,
 417                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 418                            ifmgd->bssid);
 419                 return ret;
 420         }
 421
 422         if (new_sta_bw > sta->sta.bandwidth) {
 423                 sta->sta.bandwidth = new_sta_bw;
 424                 rate_control_rate_update(local, sband, sta,
 425                                          IEEE80211_RC_BW_CHANGED);
 426         }
 427
 428         return 0;
 429 }
 430
 431 /* frame sending functions */
 432
 433 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 434                                 struct sk_buff *skb, u8 ap_ht_param,
 435                                 struct ieee80211_supported_band *sband,
 436                                 struct ieee80211_channel *channel,
 437                                 enum ieee80211_smps_mode smps)
 438 {
 439         u8 *pos;
 440         u32 flags = channel->flags;
 441         u16 cap;
 442         struct ieee80211_sta_ht_cap ht_cap;
 443
 444         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 445
 446         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 447         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 448
 449         /* determine capability flags */
 450         cap = ht_cap.cap;
 451
 452         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 453         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 454                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 455                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 456                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 457                 }
 458                 break;
 459         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 460                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 461                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 462                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 463                 }
 464                 break;
 465         }
 466
 467         /*
 468          * If 40 MHz was disabled associate as though we weren't
 469          * capable of 40 MHz -- some broken APs will never fall
 470          * back to trying to transmit in 20 MHz.
 471          */
 472         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 473                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 474                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 475         }
 476
 477         /* set SM PS mode properly */
 478         cap &= ~IEEE80211_HT_CAP_SM_PS;
 479         switch (smps) {
 480         case IEEE80211_SMPS_AUTOMATIC:
 481         case IEEE80211_SMPS_NUM_MODES:
 482                 WARN_ON(1);
 483         case IEEE80211_SMPS_OFF:
 484                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 485                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 486                 break;
 487         case IEEE80211_SMPS_STATIC:
 488                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 489                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 490                 break;
 491         case IEEE80211_SMPS_DYNAMIC:
 492                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 493                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 494                 break;
 495         }
 496
 497         /* reserve and fill IE */
 498         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 499         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 500 }
 501
 502 /* This function determines vht capability flags for the association
 503  * and builds the IE.
 504  * Note - the function may set the owner of the MU-MIMO capability
 505  */
 506 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 507                                  struct sk_buff *skb,
 508                                  struct ieee80211_supported_band *sband,
 509                                  struct ieee80211_vht_cap *ap_vht_cap)
 510 {
 511         struct ieee80211_local *local = sdata->local;
 512         u8 *pos;
 513         u32 cap;
 514         struct ieee80211_sta_vht_cap vht_cap;
 515         u32 mask, ap_bf_sts, our_bf_sts;
 516
 517         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 518
 519         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 520         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 521
 522         /* determine capability flags */
 523         cap = vht_cap.cap;
 524
 525         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 526                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 527
 528                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 529                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 530                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 531                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 532         }
 533
 534         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 535                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 536                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 537         }
 538
 539         /*
 540          * Some APs apparently get confused if our capabilities are better
 541          * than theirs, so restrict what we advertise in the assoc request.
 542          */
 543         if (!(ap_vht_cap->vht_cap_info &
 544                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 545                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 546                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 547         else if (!(ap_vht_cap->vht_cap_info &
 548                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 549                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 550
 551         /*
 552          * If some other vif is using the MU-MIMO capablity we cannot associate
 553          * using MU-MIMO - this will lead to contradictions in the group-id
 554          * mechanism.
 555          * Ownership is defined since association request, in order to avoid
 556          * simultaneous associations with MU-MIMO.
 557          */
 558         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 559                 bool disable_mu_mimo = false;
 560                 struct ieee80211_sub_if_data *other;
 561
 562                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 563                         if (other->vif.mu_mimo_owner) {
 564                                 disable_mu_mimo = true;
 565                                 break;
 566                         }
 567                 }
 568                 if (disable_mu_mimo)
 569                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 570                 else
 571                         sdata->vif.mu_mimo_owner = true;
 572         }
 573
 574         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 575
 576         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 577         our_bf_sts = cap & mask;
 578
 579         if (ap_bf_sts < our_bf_sts) {
 580                 cap &= ~mask;
 581                 cap |= ap_bf_sts;
 582         }
 583
 584         /* reserve and fill IE */
 585         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 586         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 587 }
 588
 589 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 590 {
 591         struct ieee80211_local *local = sdata->local;
 592         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 593         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 594         struct sk_buff *skb;
 595         struct ieee80211_mgmt *mgmt;
 596         u8 *pos, qos_info;
 597         size_t offset = 0, noffset;
 598         int i, count, rates_len, supp_rates_len, shift;
 599         u16 capab;
 600         struct ieee80211_supported_band *sband;
 601         struct ieee80211_chanctx_conf *chanctx_conf;
 602         struct ieee80211_channel *chan;
 603         u32 rate_flags, rates = 0;
 604
 605         sdata_assert_lock(sdata);
 606
 607         rcu_read_lock();
 608         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 609         if (WARN_ON(!chanctx_conf)) {
 610                 rcu_read_unlock();
 611                 return;
 612         }
 613         chan = chanctx_conf->def.chan;
 614         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 615         rcu_read_unlock();
 616         sband = local->hw.wiphy->bands[chan->band];
 617         shift = ieee80211_vif_get_shift(&sdata->vif);
 618
 619         if (assoc_data->supp_rates_len) {
 620                 /*
 621                  * Get all rates supported by the device and the AP as
 622                  * some APs don't like getting a superset of their rates
 623                  * in the association request (e.g. D-Link DAP 1353 in
 624                  * b-only mode)...
 625                  */
 626                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 627                                                      assoc_data->supp_rates,
 628                                                      assoc_data->supp_rates_len,
 629                                                      &rates);
 630         } else {
 631                 /*
 632                  * In case AP not provide any supported rates information
 633                  * before association, we send information element(s) with
 634                  * all rates that we support.
 635                  */
 636                 rates_len = 0;
 637                 for (i = 0; i < sband->n_bitrates; i++) {
 638                         if ((rate_flags & sband->bitrates[i].flags)
 639                             != rate_flags)
 640                                 continue;
 641                         rates |= BIT(i);
 642                         rates_len++;
 643                 }
 644         }
 645
 646         skb = alloc_skb(local->hw.extra_tx_headroom +
 647                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 648                         2 + assoc_data->ssid_len + /* SSID */
 649                         4 + rates_len + /* (extended) rates */
 650                         4 + /* power capability */
 651                         2 + 2 * sband->n_channels + /* supported channels */
 652                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 653                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 654                         assoc_data->ie_len + /* extra IEs */
 655                         9, /* WMM */
 656                         GFP_KERNEL);
 657         if (!skb)
 658                 return;
 659
 660         skb_reserve(skb, local->hw.extra_tx_headroom);
 661
 662         capab = WLAN_CAPABILITY_ESS;
 663
 664         if (sband->band == NL80211_BAND_2GHZ) {
 665                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 666                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 667         }
 668
 669         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 670                 capab |= WLAN_CAPABILITY_PRIVACY;
 671
 672         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 673             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 674                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 675
 676         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 677                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 678
 679         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 680         memset(mgmt, 0, 24);
 681         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 682         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 683         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 684
 685         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 686                 skb_put(skb, 10);
 687                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 688                                                   IEEE80211_STYPE_REASSOC_REQ);
 689                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 690                 mgmt->u.reassoc_req.listen_interval =
 691                                 cpu_to_le16(local->hw.conf.listen_interval);
 692                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 693                        ETH_ALEN);
 694         } else {
 695                 skb_put(skb, 4);
 696                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 697                                                   IEEE80211_STYPE_ASSOC_REQ);
 698                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 699                 mgmt->u.assoc_req.listen_interval =
 700                                 cpu_to_le16(local->hw.conf.listen_interval);
 701         }
 702
 703         /* SSID */
 704         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 705         *pos++ = WLAN_EID_SSID;
 706         *pos++ = assoc_data->ssid_len;
 707         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 708
 709         /* add all rates which were marked to be used above */
 710         supp_rates_len = rates_len;
 711         if (supp_rates_len > 8)
 712                 supp_rates_len = 8;
 713
 714         pos = skb_put(skb, supp_rates_len + 2);
 715         *pos++ = WLAN_EID_SUPP_RATES;
 716         *pos++ = supp_rates_len;
 717
 718         count = 0;
 719         for (i = 0; i < sband->n_bitrates; i++) {
 720                 if (BIT(i) & rates) {
 721                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 722                                                 5 * (1 << shift));
 723                         *pos++ = (u8) rate;
 724                         if (++count == 8)
 725                                 break;
 726                 }
 727         }
 728
 729         if (rates_len > count) {
 730                 pos = skb_put(skb, rates_len - count + 2);
 731                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 732                 *pos++ = rates_len - count;
 733
 734                 for (i++; i < sband->n_bitrates; i++) {
 735                         if (BIT(i) & rates) {
 736                                 int rate;
 737                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 738                                                     5 * (1 << shift));
 739                                 *pos++ = (u8) rate;
 740                         }
 741                 }
 742         }
 743
 744         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 745             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 746                 pos = skb_put(skb, 4);
 747                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 748                 *pos++ = 2;
 749                 *pos++ = 0; /* min tx power */
 750                  /* max tx power */
 751                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 752         }
 753
 754         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 755                 /* TODO: get this in reg domain format */
 756                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 757                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 758                 *pos++ = 2 * sband->n_channels;
 759                 for (i = 0; i < sband->n_channels; i++) {
 760                         *pos++ = ieee80211_frequency_to_channel(
 761                                         sband->channels[i].center_freq);
 762                         *pos++ = 1; /* one channel in the subband*/
 763                 }
 764         }
 765
 766         /* if present, add any custom IEs that go before HT */
 767         if (assoc_data->ie_len) {
 768                 static const u8 before_ht[] = {
 769                         WLAN_EID_SSID,
 770                         WLAN_EID_SUPP_RATES,
 771                         WLAN_EID_EXT_SUPP_RATES,
 772                         WLAN_EID_PWR_CAPABILITY,
 773                         WLAN_EID_SUPPORTED_CHANNELS,
 774                         WLAN_EID_RSN,
 775                         WLAN_EID_QOS_CAPA,
 776                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 777                         WLAN_EID_MOBILITY_DOMAIN,
 778                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 779                         WLAN_EID_RIC_DATA,              /* reassoc only */
 780                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 781                 };
 782                 static const u8 after_ric[] = {
 783                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 784                         WLAN_EID_HT_CAPABILITY,
 785                         WLAN_EID_BSS_COEX_2040,
 786                         WLAN_EID_EXT_CAPABILITY,
 787                         WLAN_EID_QOS_TRAFFIC_CAPA,
 788                         WLAN_EID_TIM_BCAST_REQ,
 789                         WLAN_EID_INTERWORKING,
 790                         /* 60GHz doesn't happen right now */
 791                         WLAN_EID_VHT_CAPABILITY,
 792                         WLAN_EID_OPMODE_NOTIF,
 793                 };
 794
 795                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 796                                                  assoc_data->ie_len,
 797                                                  before_ht,
 798                                                  ARRAY_SIZE(before_ht),
 799                                                  after_ric,
 800                                                  ARRAY_SIZE(after_ric),
 801                                                  offset);
 802                 pos = skb_put(skb, noffset - offset);
 803                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 804                 offset = noffset;
 805         }
 806
 807         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 808                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 809                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 810
 811         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 812                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 813                                     sband, chan, sdata->smps_mode);
 814
 815         /* if present, add any custom IEs that go before VHT */
 816         if (assoc_data->ie_len) {
 817                 static const u8 before_vht[] = {
 818                         WLAN_EID_SSID,
 819                         WLAN_EID_SUPP_RATES,
 820                         WLAN_EID_EXT_SUPP_RATES,
 821                         WLAN_EID_PWR_CAPABILITY,
 822                         WLAN_EID_SUPPORTED_CHANNELS,
 823                         WLAN_EID_RSN,
 824                         WLAN_EID_QOS_CAPA,
 825                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 826                         WLAN_EID_MOBILITY_DOMAIN,
 827                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 828                         WLAN_EID_HT_CAPABILITY,
 829                         WLAN_EID_BSS_COEX_2040,
 830                         WLAN_EID_EXT_CAPABILITY,
 831                         WLAN_EID_QOS_TRAFFIC_CAPA,
 832                         WLAN_EID_TIM_BCAST_REQ,
 833                         WLAN_EID_INTERWORKING,
 834                 };
 835
 836                 /* RIC already taken above, so no need to handle here anymore */
 837                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 838                                              before_vht, ARRAY_SIZE(before_vht),
 839                                              offset);
 840                 pos = skb_put(skb, noffset - offset);
 841                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 842                 offset = noffset;
 843         }
 844
 845         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 846                 ieee80211_add_vht_ie(sdata, skb, sband,
 847                                      &assoc_data->ap_vht_cap);
 848
 849         /* if present, add any custom non-vendor IEs that go after HT */
 850         if (assoc_data->ie_len) {
 851                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 852                                                     assoc_data->ie_len,
 853                                                     offset);
 854                 pos = skb_put(skb, noffset - offset);
 855                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 856                 offset = noffset;
 857         }
 858
 859         if (assoc_data->wmm) {
 860                 if (assoc_data->uapsd) {
 861                         qos_info = ifmgd->uapsd_queues;
 862                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 863                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 864                 } else {
 865                         qos_info = 0;
 866                 }
 867
 868                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 869         }
 870
 871         /* add any remaining custom (i.e. vendor specific here) IEs */
 872         if (assoc_data->ie_len) {
 873                 noffset = assoc_data->ie_len;
 874                 pos = skb_put(skb, noffset - offset);
 875                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 876         }
 877
 878         drv_mgd_prepare_tx(local, sdata);
 879
 880         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 881         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 882                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 883                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 884         ieee80211_tx_skb(sdata, skb);
 885 }
 886
 887 void ieee80211_send_pspoll(struct ieee80211_local *local,
 888                            struct ieee80211_sub_if_data *sdata)
 889 {
 890         struct ieee80211_pspoll *pspoll;
 891         struct sk_buff *skb;
 892
 893         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 894         if (!skb)
 895                 return;
 896
 897         pspoll = (struct ieee80211_pspoll *) skb->data;
 898         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 899
 900         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 901         ieee80211_tx_skb(sdata, skb);
 902 }
 903
 904 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 905                              struct ieee80211_sub_if_data *sdata,
 906                              bool powersave)
 907 {
 908         struct sk_buff *skb;
 909         struct ieee80211_hdr_3addr *nullfunc;
 910         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 911
 912         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 913         if (!skb)
 914                 return;
 915
 916         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 917         if (powersave)
 918                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 919
 920         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 921                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 922
 923         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 924                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 925
 926         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 927                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 928
 929         ieee80211_tx_skb(sdata, skb);
 930 }
 931
 932 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 933                                           struct ieee80211_sub_if_data *sdata)
 934 {
 935         struct sk_buff *skb;
 936         struct ieee80211_hdr *nullfunc;
 937         __le16 fc;
 938
 939         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 940                 return;
 941
 942         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 943         if (!skb)
 944                 return;
 945
 946         skb_reserve(skb, local->hw.extra_tx_headroom);
 947
 948         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 949         memset(nullfunc, 0, 30);
 950         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 951                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 952         nullfunc->frame_control = fc;
 953         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 954         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 955         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 956         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 957
 958         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 959         ieee80211_tx_skb(sdata, skb);
 960 }
 961
 962 /* spectrum management related things */
 963 static void ieee80211_chswitch_work(struct work_struct *work)
 964 {
 965         struct ieee80211_sub_if_data *sdata =
 966                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 967         struct ieee80211_local *local = sdata->local;
 968         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 969         int ret;
 970
 971         if (!ieee80211_sdata_running(sdata))
 972                 return;
 973
 974         sdata_lock(sdata);
 975         mutex_lock(&local->mtx);
 976         mutex_lock(&local->chanctx_mtx);
 977
 978         if (!ifmgd->associated)
 979                 goto out;
 980
 981         if (!sdata->vif.csa_active)
 982                 goto out;
 983
 984         /*
 985          * using reservation isn't immediate as it may be deferred until later
 986          * with multi-vif. once reservation is complete it will re-schedule the
 987          * work with no reserved_chanctx so verify chandef to check if it
 988          * completed successfully
 989          */
 990
 991         if (sdata->reserved_chanctx) {
 992                 struct ieee80211_supported_band *sband = NULL;
 993                 struct sta_info *mgd_sta = NULL;
 994                 enum ieee80211_sta_rx_bandwidth bw = IEEE80211_STA_RX_BW_20;
 995
 996                 /*
 997                  * with multi-vif csa driver may call ieee80211_csa_finish()
 998                  * many times while waiting for other interfaces to use their
 999                  * reservations
1000                  */
1001                 if (sdata->reserved_ready)
1002                         goto out;
1003
1004                 if (sdata->vif.bss_conf.chandef.width !=
1005                     sdata->csa_chandef.width) {
1006                         /*
1007                          * For managed interface, we need to also update the AP
1008                          * station bandwidth and align the rate scale algorithm
1009                          * on the bandwidth change. Here we only consider the
1010                          * bandwidth of the new channel definition (as channel
1011                          * switch flow does not have the full HT/VHT/HE
1012                          * information), assuming that if additional changes are
1013                          * required they would be done as part of the processing
1014                          * of the next beacon from the AP.
1015                          */
1016                         switch (sdata->csa_chandef.width) {
1017                         case NL80211_CHAN_WIDTH_20_NOHT:
1018                         case NL80211_CHAN_WIDTH_20:
1019                         default:
1020                                 bw = IEEE80211_STA_RX_BW_20;
1021                                 break;
1022                         case NL80211_CHAN_WIDTH_40:
1023                                 bw = IEEE80211_STA_RX_BW_40;
1024                                 break;
1025                         case NL80211_CHAN_WIDTH_80:
1026                                 bw = IEEE80211_STA_RX_BW_80;
1027                                 break;
1028                         case NL80211_CHAN_WIDTH_80P80:
1029                         case NL80211_CHAN_WIDTH_160:
1030                                 bw = IEEE80211_STA_RX_BW_160;
1031                                 break;
1032                         }
1033
1034                         mgd_sta = sta_info_get(sdata, ifmgd->bssid);
1035                         sband =
1036                                 local->hw.wiphy->bands[sdata->csa_chandef.chan->band];
1037                 }
1038
1039                 if (sdata->vif.bss_conf.chandef.width >
1040                     sdata->csa_chandef.width) {
1041                         mgd_sta->sta.bandwidth = bw;
1042                         rate_control_rate_update(local, sband, mgd_sta,
1043                                                  IEEE80211_RC_BW_CHANGED);
1044                 }
1045
1046                 ret = ieee80211_vif_use_reserved_context(sdata);
1047                 if (ret) {
1048                         sdata_info(sdata,
1049                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1050                                    ret);
1051                         ieee80211_queue_work(&sdata->local->hw,
1052                                              &ifmgd->csa_connection_drop_work);
1053                         goto out;
1054                 }
1055
1056                 if (sdata->vif.bss_conf.chandef.width <
1057                     sdata->csa_chandef.width) {
1058                         mgd_sta->sta.bandwidth = bw;
1059                         rate_control_rate_update(local, sband, mgd_sta,
1060                                                  IEEE80211_RC_BW_CHANGED);
1061                 }
1062
1063                 goto out;
1064         }
1065
1066         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1067                                         &sdata->csa_chandef)) {
1068                 sdata_info(sdata,
1069                            "failed to finalize channel switch, disconnecting\n");
1070                 ieee80211_queue_work(&sdata->local->hw,
1071                                      &ifmgd->csa_connection_drop_work);
1072                 goto out;
1073         }
1074
1075         ifmgd->csa_waiting_bcn = true;
1076
1077         ieee80211_sta_reset_beacon_monitor(sdata);
1078         ieee80211_sta_reset_conn_monitor(sdata);
1079
1080 out:
1081         mutex_unlock(&local->chanctx_mtx);
1082         mutex_unlock(&local->mtx);
1083         sdata_unlock(sdata);
1084 }
1085
1086 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1087 {
1088         struct ieee80211_local *local = sdata->local;
1089         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1090         int ret;
1091
1092         sdata_assert_lock(sdata);
1093
1094         WARN_ON(!sdata->vif.csa_active);
1095
1096         if (sdata->csa_block_tx) {
1097                 ieee80211_wake_vif_queues(local, sdata,
1098                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1099                 sdata->csa_block_tx = false;
1100         }
1101
1102         sdata->vif.csa_active = false;
1103         ifmgd->csa_waiting_bcn = false;
1104         /*
1105          * If the CSA IE is still present on the beacon after the switch,
1106          * we need to consider it as a new CSA (possibly to self).
1107          */
1108         ifmgd->beacon_crc_valid = false;
1109
1110         ret = drv_post_channel_switch(sdata);
1111         if (ret) {
1112                 sdata_info(sdata,
1113                            "driver post channel switch failed, disconnecting\n");
1114                 ieee80211_queue_work(&local->hw,
1115                                      &ifmgd->csa_connection_drop_work);
1116                 return;
1117         }
1118
1119         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1120 }
1121
1122 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1123 {
1124         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1125         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1126
1127         trace_api_chswitch_done(sdata, success);
1128         if (!success) {
1129                 sdata_info(sdata,
1130                            "driver channel switch failed, disconnecting\n");
1131                 ieee80211_queue_work(&sdata->local->hw,
1132                                      &ifmgd->csa_connection_drop_work);
1133         } else {
1134                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1135         }
1136 }
1137 EXPORT_SYMBOL(ieee80211_chswitch_done);
1138
1139 static void ieee80211_chswitch_timer(unsigned long data)
1140 {
1141         struct ieee80211_sub_if_data *sdata =
1142                 (struct ieee80211_sub_if_data *) data;
1143
1144         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1145 }
1146
1147 static void
1148 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1149                                  u64 timestamp, u32 device_timestamp,
1150                                  struct ieee802_11_elems *elems,
1151                                  bool beacon)
1152 {
1153         struct ieee80211_local *local = sdata->local;
1154         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1155         struct cfg80211_bss *cbss = ifmgd->associated;
1156         struct ieee80211_chanctx_conf *conf;
1157         struct ieee80211_chanctx *chanctx;
1158         enum nl80211_band current_band;
1159         struct ieee80211_csa_ie csa_ie;
1160         struct ieee80211_channel_switch ch_switch;
1161         int res;
1162
1163         sdata_assert_lock(sdata);
1164
1165         if (!cbss)
1166                 return;
1167
1168         if (local->scanning)
1169                 return;
1170
1171         /* disregard subsequent announcements if we are already processing */
1172         if (sdata->vif.csa_active)
1173                 return;
1174
1175         current_band = cbss->channel->band;
1176         memset(&csa_ie, 0, sizeof(csa_ie));
1177         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1178                                            ifmgd->flags,
1179                                            ifmgd->associated->bssid, &csa_ie);
1180         if (res < 0)
1181                 ieee80211_queue_work(&local->hw,
1182                                      &ifmgd->csa_connection_drop_work);
1183         if (res)
1184                 return;
1185
1186         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1187                                      IEEE80211_CHAN_DISABLED)) {
1188                 sdata_info(sdata,
1189                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1190                            ifmgd->associated->bssid,
1191                            csa_ie.chandef.chan->center_freq,
1192                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1193                            csa_ie.chandef.center_freq2);
1194                 ieee80211_queue_work(&local->hw,
1195                                      &ifmgd->csa_connection_drop_work);
1196                 return;
1197         }
1198
1199         if (cfg80211_chandef_identical(&csa_ie.chandef,
1200                                        &sdata->vif.bss_conf.chandef)) {
1201                 if (ifmgd->csa_ignored_same_chan)
1202                         return;
1203                 sdata_info(sdata,
1204                            "AP %pM tries to chanswitch to same channel, ignore\n",
1205                            ifmgd->associated->bssid);
1206                 ifmgd->csa_ignored_same_chan = true;
1207                 return;
1208         }
1209
1210         /*
1211          * Drop all TDLS peers - either we disconnect or move to a different
1212          * channel from this point on. There's no telling what our peer will do.
1213          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1214          * have an incompatible wider chandef.
1215          */
1216         ieee80211_teardown_tdls_peers(sdata);
1217
1218         mutex_lock(&local->mtx);
1219         mutex_lock(&local->chanctx_mtx);
1220         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1221                                          lockdep_is_held(&local->chanctx_mtx));
1222         if (!conf) {
1223                 sdata_info(sdata,
1224                            "no channel context assigned to vif?, disconnecting\n");
1225                 goto drop_connection;
1226         }
1227
1228         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1229
1230         if (local->use_chanctx &&
1231             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1232                 sdata_info(sdata,
1233                            "driver doesn't support chan-switch with channel contexts\n");
1234                 goto drop_connection;
1235         }
1236
1237         ch_switch.timestamp = timestamp;
1238         ch_switch.device_timestamp = device_timestamp;
1239         ch_switch.block_tx = csa_ie.mode;
1240         ch_switch.chandef = csa_ie.chandef;
1241         ch_switch.count = csa_ie.count;
1242
1243         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1244                 sdata_info(sdata,
1245                            "preparing for channel switch failed, disconnecting\n");
1246                 goto drop_connection;
1247         }
1248
1249         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1250                                             chanctx->mode, false);
1251         if (res) {
1252                 sdata_info(sdata,
1253                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1254                            res);
1255                 goto drop_connection;
1256         }
1257         mutex_unlock(&local->chanctx_mtx);
1258
1259         sdata->vif.csa_active = true;
1260         sdata->csa_chandef = csa_ie.chandef;
1261         sdata->csa_block_tx = csa_ie.mode;
1262         ifmgd->csa_ignored_same_chan = false;
1263
1264         if (sdata->csa_block_tx)
1265                 ieee80211_stop_vif_queues(local, sdata,
1266                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1267         mutex_unlock(&local->mtx);
1268
1269         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1270                                           csa_ie.count);
1271
1272         if (local->ops->channel_switch) {
1273                 /* use driver's channel switch callback */
1274                 drv_channel_switch(local, sdata, &ch_switch);
1275                 return;
1276         }
1277
1278         /* channel switch handled in software */
1279         if (csa_ie.count <= 1)
1280                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1281         else
1282                 mod_timer(&ifmgd->chswitch_timer,
1283                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1284                                          cbss->beacon_interval));
1285         return;
1286  drop_connection:
1287         /*
1288          * This is just so that the disconnect flow will know that
1289          * we were trying to switch channel and failed. In case the
1290          * mode is 1 (we are not allowed to Tx), we will know not to
1291          * send a deauthentication frame. Those two fields will be
1292          * reset when the disconnection worker runs.
1293          */
1294         sdata->vif.csa_active = true;
1295         sdata->csa_block_tx = csa_ie.mode;
1296
1297         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1298         mutex_unlock(&local->chanctx_mtx);
1299         mutex_unlock(&local->mtx);
1300 }
1301
1302 static bool
1303 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1304                                  struct ieee80211_channel *channel,
1305                                  const u8 *country_ie, u8 country_ie_len,
1306                                  const u8 *pwr_constr_elem,
1307                                  int *chan_pwr, int *pwr_reduction)
1308 {
1309         struct ieee80211_country_ie_triplet *triplet;
1310         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1311         int i, chan_increment;
1312         bool have_chan_pwr = false;
1313
1314         /* Invalid IE */
1315         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1316                 return false;
1317
1318         triplet = (void *)(country_ie + 3);
1319         country_ie_len -= 3;
1320
1321         switch (channel->band) {
1322         default:
1323                 WARN_ON_ONCE(1);
1324                 /* fall through */
1325         case NL80211_BAND_2GHZ:
1326         case NL80211_BAND_60GHZ:
1327                 chan_increment = 1;
1328                 break;
1329         case NL80211_BAND_5GHZ:
1330                 chan_increment = 4;
1331                 break;
1332         }
1333
1334         /* find channel */
1335         while (country_ie_len >= 3) {
1336                 u8 first_channel = triplet->chans.first_channel;
1337
1338                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1339                         goto next;
1340
1341                 for (i = 0; i < triplet->chans.num_channels; i++) {
1342                         if (first_channel + i * chan_increment == chan) {
1343                                 have_chan_pwr = true;
1344                                 *chan_pwr = triplet->chans.max_power;
1345                                 break;
1346                         }
1347                 }
1348                 if (have_chan_pwr)
1349                         break;
1350
1351  next:
1352                 triplet++;
1353                 country_ie_len -= 3;
1354         }
1355
1356         if (have_chan_pwr && pwr_constr_elem)
1357                 *pwr_reduction = *pwr_constr_elem;
1358         else
1359                 *pwr_reduction = 0;
1360
1361         return have_chan_pwr;
1362 }
1363
1364 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1365                                       struct ieee80211_channel *channel,
1366                                       const u8 *cisco_dtpc_ie,
1367                                       int *pwr_level)
1368 {
1369         /* From practical testing, the first data byte of the DTPC element
1370          * seems to contain the requested dBm level, and the CLI on Cisco
1371          * APs clearly state the range is -127 to 127 dBm, which indicates
1372          * a signed byte, although it seemingly never actually goes negative.
1373          * The other byte seems to always be zero.
1374          */
1375         *pwr_level = (__s8)cisco_dtpc_ie[4];
1376 }
1377
1378 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1379                                        struct ieee80211_channel *channel,
1380                                        struct ieee80211_mgmt *mgmt,
1381                                        const u8 *country_ie, u8 country_ie_len,
1382                                        const u8 *pwr_constr_ie,
1383                                        const u8 *cisco_dtpc_ie)
1384 {
1385         bool has_80211h_pwr = false, has_cisco_pwr = false;
1386         int chan_pwr = 0, pwr_reduction_80211h = 0;
1387         int pwr_level_cisco, pwr_level_80211h;
1388         int new_ap_level;
1389         __le16 capab = mgmt->u.probe_resp.capab_info;
1390
1391         if (country_ie &&
1392             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1393              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1394                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1395                         sdata, channel, country_ie, country_ie_len,
1396                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1397                 pwr_level_80211h =
1398                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1399         }
1400
1401         if (cisco_dtpc_ie) {
1402                 ieee80211_find_cisco_dtpc(
1403                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1404                 has_cisco_pwr = true;
1405         }
1406
1407         if (!has_80211h_pwr && !has_cisco_pwr)
1408                 return 0;
1409
1410         /* If we have both 802.11h and Cisco DTPC, apply both limits
1411          * by picking the smallest of the two power levels advertised.
1412          */
1413         if (has_80211h_pwr &&
1414             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1415                 new_ap_level = pwr_level_80211h;
1416
1417                 if (sdata->ap_power_level == new_ap_level)
1418                         return 0;
1419
1420                 sdata_dbg(sdata,
1421                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1422                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1423                           sdata->u.mgd.bssid);
1424         } else {  /* has_cisco_pwr is always true here. */
1425                 new_ap_level = pwr_level_cisco;
1426
1427                 if (sdata->ap_power_level == new_ap_level)
1428                         return 0;
1429
1430                 sdata_dbg(sdata,
1431                           "Limiting TX power to %d dBm as advertised by %pM\n",
1432                           pwr_level_cisco, sdata->u.mgd.bssid);
1433         }
1434
1435         sdata->ap_power_level = new_ap_level;
1436         if (__ieee80211_recalc_txpower(sdata))
1437                 return BSS_CHANGED_TXPOWER;
1438         return 0;
1439 }
1440
1441 /* powersave */
1442 static void ieee80211_enable_ps(struct ieee80211_local *local,
1443                                 struct ieee80211_sub_if_data *sdata)
1444 {
1445         struct ieee80211_conf *conf = &local->hw.conf;
1446
1447         /*
1448          * If we are scanning right now then the parameters will
1449          * take effect when scan finishes.
1450          */
1451         if (local->scanning)
1452                 return;
1453
1454         if (conf->dynamic_ps_timeout > 0 &&
1455             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1456                 mod_timer(&local->dynamic_ps_timer, jiffies +
1457                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1458         } else {
1459                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1460                         ieee80211_send_nullfunc(local, sdata, true);
1461
1462                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1463                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1464                         return;
1465
1466                 conf->flags |= IEEE80211_CONF_PS;
1467                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1468         }
1469 }
1470
1471 static void ieee80211_change_ps(struct ieee80211_local *local)
1472 {
1473         struct ieee80211_conf *conf = &local->hw.conf;
1474
1475         if (local->ps_sdata) {
1476                 ieee80211_enable_ps(local, local->ps_sdata);
1477         } else if (conf->flags & IEEE80211_CONF_PS) {
1478                 conf->flags &= ~IEEE80211_CONF_PS;
1479                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1480                 del_timer_sync(&local->dynamic_ps_timer);
1481                 cancel_work_sync(&local->dynamic_ps_enable_work);
1482         }
1483 }
1484
1485 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1486 {
1487         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1488         struct sta_info *sta = NULL;
1489         bool authorized = false;
1490
1491         if (!mgd->powersave)
1492                 return false;
1493
1494         if (mgd->broken_ap)
1495                 return false;
1496
1497         if (!mgd->associated)
1498                 return false;
1499
1500         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1501                 return false;
1502
1503         if (!mgd->have_beacon)
1504                 return false;
1505
1506         rcu_read_lock();
1507         sta = sta_info_get(sdata, mgd->bssid);
1508         if (sta)
1509                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1510         rcu_read_unlock();
1511
1512         return authorized;
1513 }
1514
1515 /* need to hold RTNL or interface lock */
1516 void ieee80211_recalc_ps(struct ieee80211_local *local)
1517 {
1518         struct ieee80211_sub_if_data *sdata, *found = NULL;
1519         int count = 0;
1520         int timeout;
1521
1522         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1523                 local->ps_sdata = NULL;
1524                 return;
1525         }
1526
1527         list_for_each_entry(sdata, &local->interfaces, list) {
1528                 if (!ieee80211_sdata_running(sdata))
1529                         continue;
1530                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1531                         /* If an AP vif is found, then disable PS
1532                          * by setting the count to zero thereby setting
1533                          * ps_sdata to NULL.
1534                          */
1535                         count = 0;
1536                         break;
1537                 }
1538                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1539                         continue;
1540                 found = sdata;
1541                 count++;
1542         }
1543
1544         if (count == 1 && ieee80211_powersave_allowed(found)) {
1545                 u8 dtimper = found->u.mgd.dtim_period;
1546                 s32 beaconint_us;
1547
1548                 beaconint_us = ieee80211_tu_to_usec(
1549                                         found->vif.bss_conf.beacon_int);
1550
1551                 timeout = local->dynamic_ps_forced_timeout;
1552                 if (timeout < 0)
1553                         timeout = 100;
1554                 local->hw.conf.dynamic_ps_timeout = timeout;
1555
1556                 /* If the TIM IE is invalid, pretend the value is 1 */
1557                 if (!dtimper)
1558                         dtimper = 1;
1559
1560                 local->hw.conf.ps_dtim_period = dtimper;
1561                 local->ps_sdata = found;
1562         } else {
1563                 local->ps_sdata = NULL;
1564         }
1565
1566         ieee80211_change_ps(local);
1567 }
1568
1569 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1570 {
1571         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1572
1573         if (sdata->vif.bss_conf.ps != ps_allowed) {
1574                 sdata->vif.bss_conf.ps = ps_allowed;
1575                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1576         }
1577 }
1578
1579 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1580 {
1581         struct ieee80211_local *local =
1582                 container_of(work, struct ieee80211_local,
1583                              dynamic_ps_disable_work);
1584
1585         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1586                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1587                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1588         }
1589
1590         ieee80211_wake_queues_by_reason(&local->hw,
1591                                         IEEE80211_MAX_QUEUE_MAP,
1592                                         IEEE80211_QUEUE_STOP_REASON_PS,
1593                                         false);
1594 }
1595
1596 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1597 {
1598         struct ieee80211_local *local =
1599                 container_of(work, struct ieee80211_local,
1600                              dynamic_ps_enable_work);
1601         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1602         struct ieee80211_if_managed *ifmgd;
1603         unsigned long flags;
1604         int q;
1605
1606         /* can only happen when PS was just disabled anyway */
1607         if (!sdata)
1608                 return;
1609
1610         ifmgd = &sdata->u.mgd;
1611
1612         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1613                 return;
1614
1615         if (local->hw.conf.dynamic_ps_timeout > 0) {
1616                 /* don't enter PS if TX frames are pending */
1617                 if (drv_tx_frames_pending(local)) {
1618                         mod_timer(&local->dynamic_ps_timer, jiffies +
1619                                   msecs_to_jiffies(
1620                                   local->hw.conf.dynamic_ps_timeout));
1621                         return;
1622                 }
1623
1624                 /*
1625                  * transmission can be stopped by others which leads to
1626                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1627                  * is not the actual idle state.
1628                  */
1629                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1630                 for (q = 0; q < local->hw.queues; q++) {
1631                         if (local->queue_stop_reasons[q]) {
1632                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1633                                                        flags);
1634                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1635                                           msecs_to_jiffies(
1636                                           local->hw.conf.dynamic_ps_timeout));
1637                                 return;
1638                         }
1639                 }
1640                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1641         }
1642
1643         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1644             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1645                 if (drv_tx_frames_pending(local)) {
1646                         mod_timer(&local->dynamic_ps_timer, jiffies +
1647                                   msecs_to_jiffies(
1648                                   local->hw.conf.dynamic_ps_timeout));
1649                 } else {
1650                         ieee80211_send_nullfunc(local, sdata, true);
1651                         /* Flush to get the tx status of nullfunc frame */
1652                         ieee80211_flush_queues(local, sdata, false);
1653                 }
1654         }
1655
1656         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1657               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1658             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1659                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1660                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1661                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1662         }
1663 }
1664
1665 void ieee80211_dynamic_ps_timer(unsigned long data)
1666 {
1667         struct ieee80211_local *local = (void *) data;
1668
1669         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1670 }
1671
1672 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1673 {
1674         struct delayed_work *delayed_work = to_delayed_work(work);
1675         struct ieee80211_sub_if_data *sdata =
1676                 container_of(delayed_work, struct ieee80211_sub_if_data,
1677                              dfs_cac_timer_work);
1678         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1679
1680         mutex_lock(&sdata->local->mtx);
1681         if (sdata->wdev.cac_started) {
1682                 ieee80211_vif_release_channel(sdata);
1683                 cfg80211_cac_event(sdata->dev, &chandef,
1684                                    NL80211_RADAR_CAC_FINISHED,
1685                                    GFP_KERNEL);
1686         }
1687         mutex_unlock(&sdata->local->mtx);
1688 }
1689
1690 static bool
1691 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1692 {
1693         struct ieee80211_local *local = sdata->local;
1694         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1695         bool ret = false;
1696         int ac;
1697
1698         if (local->hw.queues < IEEE80211_NUM_ACS)
1699                 return false;
1700
1701         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1702                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1703                 int non_acm_ac;
1704                 unsigned long now = jiffies;
1705
1706                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1707                     tx_tspec->admitted_time &&
1708                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1709                         tx_tspec->consumed_tx_time = 0;
1710                         tx_tspec->time_slice_start = now;
1711
1712                         if (tx_tspec->downgraded)
1713                                 tx_tspec->action =
1714                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1715                 }
1716
1717                 switch (tx_tspec->action) {
1718                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1719                         /* take the original parameters */
1720                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1721                                 sdata_err(sdata,
1722                                           "failed to set TX queue parameters for queue %d\n",
1723                                           ac);
1724                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1725                         tx_tspec->downgraded = false;
1726                         ret = true;
1727                         break;
1728                 case TX_TSPEC_ACTION_DOWNGRADE:
1729                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1730                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1731                                 ret = true;
1732                                 break;
1733                         }
1734                         /* downgrade next lower non-ACM AC */
1735                         for (non_acm_ac = ac + 1;
1736                              non_acm_ac < IEEE80211_NUM_ACS;
1737                              non_acm_ac++)
1738                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1739                                         break;
1740                         /* Usually the loop will result in using BK even if it
1741                          * requires admission control, but such a configuration
1742                          * makes no sense and we have to transmit somehow - the
1743                          * AC selection does the same thing.
1744                          * If we started out trying to downgrade from BK, then
1745                          * the extra condition here might be needed.
1746                          */
1747                         if (non_acm_ac >= IEEE80211_NUM_ACS)
1748                                 non_acm_ac = IEEE80211_AC_BK;
1749                         if (drv_conf_tx(local, sdata, ac,
1750                                         &sdata->tx_conf[non_acm_ac]))
1751                                 sdata_err(sdata,
1752                                           "failed to set TX queue parameters for queue %d\n",
1753                                           ac);
1754                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1755                         ret = true;
1756                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1757                                 tx_tspec->time_slice_start + HZ - now + 1);
1758                         break;
1759                 case TX_TSPEC_ACTION_NONE:
1760                         /* nothing now */
1761                         break;
1762                 }
1763         }
1764
1765         return ret;
1766 }
1767
1768 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1769 {
1770         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1771                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1772 }
1773
1774 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1775 {
1776         struct ieee80211_sub_if_data *sdata;
1777
1778         sdata = container_of(work, struct ieee80211_sub_if_data,
1779                              u.mgd.tx_tspec_wk.work);
1780         ieee80211_sta_handle_tspec_ac_params(sdata);
1781 }
1782
1783 /* MLME */
1784 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1785                                      struct ieee80211_sub_if_data *sdata,
1786                                      const u8 *wmm_param, size_t wmm_param_len)
1787 {
1788         struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1789         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1790         size_t left;
1791         int count, ac;
1792         const u8 *pos;
1793         u8 uapsd_queues = 0;
1794
1795         if (!local->ops->conf_tx)
1796                 return false;
1797
1798         if (local->hw.queues < IEEE80211_NUM_ACS)
1799                 return false;
1800
1801         if (!wmm_param)
1802                 return false;
1803
1804         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1805                 return false;
1806
1807         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1808                 uapsd_queues = ifmgd->uapsd_queues;
1809
1810         count = wmm_param[6] & 0x0f;
1811         if (count == ifmgd->wmm_last_param_set)
1812                 return false;
1813         ifmgd->wmm_last_param_set = count;
1814
1815         pos = wmm_param + 8;
1816         left = wmm_param_len - 8;
1817
1818         memset(&params, 0, sizeof(params));
1819
1820         sdata->wmm_acm = 0;
1821         for (; left >= 4; left -= 4, pos += 4) {
1822                 int aci = (pos[0] >> 5) & 0x03;
1823                 int acm = (pos[0] >> 4) & 0x01;
1824                 bool uapsd = false;
1825
1826                 switch (aci) {
1827                 case 1: /* AC_BK */
1828                         ac = IEEE80211_AC_BK;
1829                         if (acm)
1830                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1831                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1832                                 uapsd = true;
1833                         break;
1834                 case 2: /* AC_VI */
1835                         ac = IEEE80211_AC_VI;
1836                         if (acm)
1837                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1838                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1839                                 uapsd = true;
1840                         break;
1841                 case 3: /* AC_VO */
1842                         ac = IEEE80211_AC_VO;
1843                         if (acm)
1844                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1845                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1846                                 uapsd = true;
1847                         break;
1848                 case 0: /* AC_BE */
1849                 default:
1850                         ac = IEEE80211_AC_BE;
1851                         if (acm)
1852                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1853                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1854                                 uapsd = true;
1855                         break;
1856                 }
1857
1858                 params[ac].aifs = pos[0] & 0x0f;
1859
1860                 if (params[ac].aifs < 2) {
1861                         sdata_info(sdata,
1862                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1863                                    params[ac].aifs, aci);
1864                         params[ac].aifs = 2;
1865                 }
1866                 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1867                 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1868                 params[ac].txop = get_unaligned_le16(pos + 2);
1869                 params[ac].acm = acm;
1870                 params[ac].uapsd = uapsd;
1871
1872                 if (params[ac].cw_min == 0 ||
1873                     params[ac].cw_min > params[ac].cw_max) {
1874                         sdata_info(sdata,
1875                                    "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1876                                    params[ac].cw_min, params[ac].cw_max, aci);
1877                         return false;
1878                 }
1879         }
1880
1881         /* WMM specification requires all 4 ACIs. */
1882         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1883                 if (params[ac].cw_min == 0) {
1884                         sdata_info(sdata,
1885                                    "AP has invalid WMM params (missing AC %d), using defaults\n",
1886                                    ac);
1887                         return false;
1888                 }
1889         }
1890
1891         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1892                 mlme_dbg(sdata,
1893                          "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1894                          ac, params[ac].acm,
1895                          params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1896                          params[ac].txop, params[ac].uapsd,
1897                          ifmgd->tx_tspec[ac].downgraded);
1898                 sdata->tx_conf[ac] = params[ac];
1899                 if (!ifmgd->tx_tspec[ac].downgraded &&
1900                     drv_conf_tx(local, sdata, ac, &params[ac]))
1901                         sdata_err(sdata,
1902                                   "failed to set TX queue parameters for AC %d\n",
1903                                   ac);
1904         }
1905
1906         /* enable WMM or activate new settings */
1907         sdata->vif.bss_conf.qos = true;
1908         return true;
1909 }
1910
1911 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1912 {
1913         lockdep_assert_held(&sdata->local->mtx);
1914
1915         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1916         ieee80211_run_deferred_scan(sdata->local);
1917 }
1918
1919 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1920 {
1921         mutex_lock(&sdata->local->mtx);
1922         __ieee80211_stop_poll(sdata);
1923         mutex_unlock(&sdata->local->mtx);
1924 }
1925
1926 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1927                                            u16 capab, bool erp_valid, u8 erp)
1928 {
1929         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1930         struct ieee80211_supported_band *sband;
1931         u32 changed = 0;
1932         bool use_protection;
1933         bool use_short_preamble;
1934         bool use_short_slot;
1935
1936         sband = ieee80211_get_sband(sdata);
1937         if (!sband)
1938                 return changed;
1939
1940         if (erp_valid) {
1941                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1942                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1943         } else {
1944                 use_protection = false;
1945                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1946         }
1947
1948         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1949         if (sband->band == NL80211_BAND_5GHZ)
1950                 use_short_slot = true;
1951
1952         if (use_protection != bss_conf->use_cts_prot) {
1953                 bss_conf->use_cts_prot = use_protection;
1954                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1955         }
1956
1957         if (use_short_preamble != bss_conf->use_short_preamble) {
1958                 bss_conf->use_short_preamble = use_short_preamble;
1959                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1960         }
1961
1962         if (use_short_slot != bss_conf->use_short_slot) {
1963                 bss_conf->use_short_slot = use_short_slot;
1964                 changed |= BSS_CHANGED_ERP_SLOT;
1965         }
1966
1967         return changed;
1968 }
1969
1970 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1971                                      struct cfg80211_bss *cbss,
1972                                      u32 bss_info_changed)
1973 {
1974         struct ieee80211_bss *bss = (void *)cbss->priv;
1975         struct ieee80211_local *local = sdata->local;
1976         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1977
1978         bss_info_changed |= BSS_CHANGED_ASSOC;
1979         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1980                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1981
1982         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1983                 beacon_loss_count * bss_conf->beacon_int));
1984
1985         sdata->u.mgd.associated = cbss;
1986         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1987
1988         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1989
1990         if (sdata->vif.p2p ||
1991             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1992                 const struct cfg80211_bss_ies *ies;
1993
1994                 rcu_read_lock();
1995                 ies = rcu_dereference(cbss->ies);
1996                 if (ies) {
1997                         int ret;
1998
1999                         ret = cfg80211_get_p2p_attr(
2000                                         ies->data, ies->len,
2001                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2002                                         (u8 *) &bss_conf->p2p_noa_attr,
2003                                         sizeof(bss_conf->p2p_noa_attr));
2004                         if (ret >= 2) {
2005                                 sdata->u.mgd.p2p_noa_index =
2006                                         bss_conf->p2p_noa_attr.index;
2007                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
2008                         }
2009                 }
2010                 rcu_read_unlock();
2011         }
2012
2013         /* just to be sure */
2014         ieee80211_stop_poll(sdata);
2015
2016         ieee80211_led_assoc(local, 1);
2017
2018         if (sdata->u.mgd.have_beacon) {
2019                 /*
2020                  * If the AP is buggy we may get here with no DTIM period
2021                  * known, so assume it's 1 which is the only safe assumption
2022                  * in that case, although if the TIM IE is broken powersave
2023                  * probably just won't work at all.
2024                  */
2025                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
2026                 bss_conf->beacon_rate = bss->beacon_rate;
2027                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
2028         } else {
2029                 bss_conf->beacon_rate = NULL;
2030                 bss_conf->dtim_period = 0;
2031         }
2032
2033         bss_conf->assoc = 1;
2034
2035         /* Tell the driver to monitor connection quality (if supported) */
2036         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
2037             bss_conf->cqm_rssi_thold)
2038                 bss_info_changed |= BSS_CHANGED_CQM;
2039
2040         /* Enable ARP filtering */
2041         if (bss_conf->arp_addr_cnt)
2042                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
2043
2044         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
2045
2046         mutex_lock(&local->iflist_mtx);
2047         ieee80211_recalc_ps(local);
2048         mutex_unlock(&local->iflist_mtx);
2049
2050         ieee80211_recalc_smps(sdata);
2051         ieee80211_recalc_ps_vif(sdata);
2052
2053         netif_carrier_on(sdata->dev);
2054 }
2055
2056 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2057                                    u16 stype, u16 reason, bool tx,
2058                                    u8 *frame_buf)
2059 {
2060         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2061         struct ieee80211_local *local = sdata->local;
2062         u32 changed = 0;
2063
2064         sdata_assert_lock(sdata);
2065
2066         if (WARN_ON_ONCE(tx && !frame_buf))
2067                 return;
2068
2069         if (WARN_ON(!ifmgd->associated))
2070                 return;
2071
2072         ieee80211_stop_poll(sdata);
2073
2074         ifmgd->associated = NULL;
2075         netif_carrier_off(sdata->dev);
2076
2077         /*
2078          * if we want to get out of ps before disassoc (why?) we have
2079          * to do it before sending disassoc, as otherwise the null-packet
2080          * won't be valid.
2081          */
2082         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2083                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2084                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2085         }
2086         local->ps_sdata = NULL;
2087
2088         /* disable per-vif ps */
2089         ieee80211_recalc_ps_vif(sdata);
2090
2091         /* make sure ongoing transmission finishes */
2092         synchronize_net();
2093
2094         /*
2095          * drop any frame before deauth/disassoc, this can be data or
2096          * management frame. Since we are disconnecting, we should not
2097          * insist sending these frames which can take time and delay
2098          * the disconnection and possible the roaming.
2099          */
2100         if (tx)
2101                 ieee80211_flush_queues(local, sdata, true);
2102
2103         /* deauthenticate/disassociate now */
2104         if (tx || frame_buf)
2105                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2106                                                reason, tx, frame_buf);
2107
2108         /* flush out frame - make sure the deauth was actually sent */
2109         if (tx)
2110                 ieee80211_flush_queues(local, sdata, false);
2111
2112         /* clear bssid only after building the needed mgmt frames */
2113         eth_zero_addr(ifmgd->bssid);
2114
2115         /* remove AP and TDLS peers */
2116         sta_info_flush(sdata);
2117
2118         /* finally reset all BSS / config parameters */
2119         changed |= ieee80211_reset_erp_info(sdata);
2120
2121         ieee80211_led_assoc(local, 0);
2122         changed |= BSS_CHANGED_ASSOC;
2123         sdata->vif.bss_conf.assoc = false;
2124
2125         ifmgd->p2p_noa_index = -1;
2126         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2127                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2128
2129         /* on the next assoc, re-program HT/VHT parameters */
2130         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2131         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2132         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2133         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2134
2135         /* reset MU-MIMO ownership and group data */
2136         memset(sdata->vif.bss_conf.mu_group.membership, 0,
2137                sizeof(sdata->vif.bss_conf.mu_group.membership));
2138         memset(sdata->vif.bss_conf.mu_group.position, 0,
2139                sizeof(sdata->vif.bss_conf.mu_group.position));
2140         changed |= BSS_CHANGED_MU_GROUPS;
2141         sdata->vif.mu_mimo_owner = false;
2142
2143         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2144
2145         del_timer_sync(&local->dynamic_ps_timer);
2146         cancel_work_sync(&local->dynamic_ps_enable_work);
2147
2148         /* Disable ARP filtering */
2149         if (sdata->vif.bss_conf.arp_addr_cnt)
2150                 changed |= BSS_CHANGED_ARP_FILTER;
2151
2152         sdata->vif.bss_conf.qos = false;
2153         changed |= BSS_CHANGED_QOS;
2154
2155         /* The BSSID (not really interesting) and HT changed */
2156         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2157         ieee80211_bss_info_change_notify(sdata, changed);
2158
2159         /* disassociated - set to defaults now */
2160         ieee80211_set_wmm_default(sdata, false, false);
2161
2162         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2163         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2164         del_timer_sync(&sdata->u.mgd.timer);
2165         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2166
2167         sdata->vif.bss_conf.dtim_period = 0;
2168         sdata->vif.bss_conf.beacon_rate = NULL;
2169
2170         ifmgd->have_beacon = false;
2171
2172         ifmgd->flags = 0;
2173         mutex_lock(&local->mtx);
2174         ieee80211_vif_release_channel(sdata);
2175
2176         sdata->vif.csa_active = false;
2177         ifmgd->csa_waiting_bcn = false;
2178         ifmgd->csa_ignored_same_chan = false;
2179         if (sdata->csa_block_tx) {
2180                 ieee80211_wake_vif_queues(local, sdata,
2181                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2182                 sdata->csa_block_tx = false;
2183         }
2184         mutex_unlock(&local->mtx);
2185
2186         /* existing TX TSPEC sessions no longer exist */
2187         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2188         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2189
2190         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2191 }
2192
2193 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2194                              struct ieee80211_hdr *hdr)
2195 {
2196         /*
2197          * We can postpone the mgd.timer whenever receiving unicast frames
2198          * from AP because we know that the connection is working both ways
2199          * at that time. But multicast frames (and hence also beacons) must
2200          * be ignored here, because we need to trigger the timer during
2201          * data idle periods for sending the periodic probe request to the
2202          * AP we're connected to.
2203          */
2204         if (is_multicast_ether_addr(hdr->addr1))
2205                 return;
2206
2207         ieee80211_sta_reset_conn_monitor(sdata);
2208 }
2209
2210 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2211 {
2212         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2213         struct ieee80211_local *local = sdata->local;
2214
2215         mutex_lock(&local->mtx);
2216         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2217                 goto out;
2218
2219         __ieee80211_stop_poll(sdata);
2220
2221         mutex_lock(&local->iflist_mtx);
2222         ieee80211_recalc_ps(local);
2223         mutex_unlock(&local->iflist_mtx);
2224
2225         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2226                 goto out;
2227
2228         /*
2229          * We've received a probe response, but are not sure whether
2230          * we have or will be receiving any beacons or data, so let's
2231          * schedule the timers again, just in case.
2232          */
2233         ieee80211_sta_reset_beacon_monitor(sdata);
2234
2235         mod_timer(&ifmgd->conn_mon_timer,
2236                   round_jiffies_up(jiffies +
2237                                    IEEE80211_CONNECTION_IDLE_TIME));
2238 out:
2239         mutex_unlock(&local->mtx);
2240 }
2241
2242 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2243                                            struct ieee80211_hdr *hdr,
2244                                            u16 tx_time)
2245 {
2246         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2247         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2248         int ac = ieee80211_ac_from_tid(tid);
2249         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2250         unsigned long now = jiffies;
2251
2252         if (likely(!tx_tspec->admitted_time))
2253                 return;
2254
2255         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2256                 tx_tspec->consumed_tx_time = 0;
2257                 tx_tspec->time_slice_start = now;
2258
2259                 if (tx_tspec->downgraded) {
2260                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2261                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2262                 }
2263         }
2264
2265         if (tx_tspec->downgraded)
2266                 return;
2267
2268         tx_tspec->consumed_tx_time += tx_time;
2269
2270         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2271                 tx_tspec->downgraded = true;
2272                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2273                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2274         }
2275 }
2276
2277 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2278                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2279 {
2280         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2281
2282         if (!ieee80211_is_data(hdr->frame_control))
2283             return;
2284
2285         if (ieee80211_is_any_nullfunc(hdr->frame_control) &&
2286             sdata->u.mgd.probe_send_count > 0) {
2287                 if (ack)
2288                         ieee80211_sta_reset_conn_monitor(sdata);
2289                 else
2290                         sdata->u.mgd.nullfunc_failed = true;
2291                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2292                 return;
2293         }
2294
2295         if (ack)
2296                 ieee80211_sta_reset_conn_monitor(sdata);
2297 }
2298
2299 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2300 {
2301         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2302         const u8 *ssid;
2303         u8 *dst = ifmgd->associated->bssid;
2304         u8 unicast_limit = max(1, max_probe_tries - 3);
2305         struct sta_info *sta;
2306
2307         /*
2308          * Try sending broadcast probe requests for the last three
2309          * probe requests after the first ones failed since some
2310          * buggy APs only support broadcast probe requests.
2311          */
2312         if (ifmgd->probe_send_count >= unicast_limit)
2313                 dst = NULL;
2314
2315         /*
2316          * When the hardware reports an accurate Tx ACK status, it's
2317          * better to send a nullfunc frame instead of a probe request,
2318          * as it will kick us off the AP quickly if we aren't associated
2319          * anymore. The timeout will be reset if the frame is ACKed by
2320          * the AP.
2321          */
2322         ifmgd->probe_send_count++;
2323
2324         if (dst) {
2325                 mutex_lock(&sdata->local->sta_mtx);
2326                 sta = sta_info_get(sdata, dst);
2327                 if (!WARN_ON(!sta))
2328                         ieee80211_check_fast_rx(sta);
2329                 mutex_unlock(&sdata->local->sta_mtx);
2330         }
2331
2332         if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2333                 ifmgd->nullfunc_failed = false;
2334                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2335         } else {
2336                 int ssid_len;
2337
2338                 rcu_read_lock();
2339                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2340                 if (WARN_ON_ONCE(ssid == NULL))
2341                         ssid_len = 0;
2342                 else
2343                         ssid_len = ssid[1];
2344
2345                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2346                                          ssid + 2, ssid_len, NULL,
2347                                          0, (u32) -1, true, 0,
2348                                          ifmgd->associated->channel, false);
2349                 rcu_read_unlock();
2350         }
2351
2352         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2353         run_again(sdata, ifmgd->probe_timeout);
2354 }
2355
2356 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2357                                    bool beacon)
2358 {
2359         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2360         bool already = false;
2361
2362         if (!ieee80211_sdata_running(sdata))
2363                 return;
2364
2365         sdata_lock(sdata);
2366
2367         if (!ifmgd->associated)
2368                 goto out;
2369
2370         mutex_lock(&sdata->local->mtx);
2371
2372         if (sdata->local->tmp_channel || sdata->local->scanning) {
2373                 mutex_unlock(&sdata->local->mtx);
2374                 goto out;
2375         }
2376
2377         if (beacon) {
2378                 mlme_dbg_ratelimited(sdata,
2379                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2380                                      beacon_loss_count);
2381
2382                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2383         }
2384
2385         /*
2386          * The driver/our work has already reported this event or the
2387          * connection monitoring has kicked in and we have already sent
2388          * a probe request. Or maybe the AP died and the driver keeps
2389          * reporting until we disassociate...
2390          *
2391          * In either case we have to ignore the current call to this
2392          * function (except for setting the correct probe reason bit)
2393          * because otherwise we would reset the timer every time and
2394          * never check whether we received a probe response!
2395          */
2396         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2397                 already = true;
2398
2399         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2400
2401         mutex_unlock(&sdata->local->mtx);
2402
2403         if (already)
2404                 goto out;
2405
2406         mutex_lock(&sdata->local->iflist_mtx);
2407         ieee80211_recalc_ps(sdata->local);
2408         mutex_unlock(&sdata->local->iflist_mtx);
2409
2410         ifmgd->probe_send_count = 0;
2411         ieee80211_mgd_probe_ap_send(sdata);
2412  out:
2413         sdata_unlock(sdata);
2414 }
2415
2416 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2417                                           struct ieee80211_vif *vif)
2418 {
2419         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2420         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2421         struct cfg80211_bss *cbss;
2422         struct sk_buff *skb;
2423         const u8 *ssid;
2424         int ssid_len;
2425
2426         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2427                 return NULL;
2428
2429         sdata_assert_lock(sdata);
2430
2431         if (ifmgd->associated)
2432                 cbss = ifmgd->associated;
2433         else if (ifmgd->auth_data)
2434                 cbss = ifmgd->auth_data->bss;
2435         else if (ifmgd->assoc_data)
2436                 cbss = ifmgd->assoc_data->bss;
2437         else
2438                 return NULL;
2439
2440         rcu_read_lock();
2441         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2442         if (WARN_ONCE(!ssid || ssid[1] > IEEE80211_MAX_SSID_LEN,
2443                       "invalid SSID element (len=%d)", ssid ? ssid[1] : -1))
2444                 ssid_len = 0;
2445         else
2446                 ssid_len = ssid[1];
2447
2448         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2449                                         (u32) -1, cbss->channel,
2450                                         ssid + 2, ssid_len,
2451                                         NULL, 0, true);
2452         rcu_read_unlock();
2453
2454         return skb;
2455 }
2456 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2457
2458 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2459                                         const u8 *buf, size_t len, bool tx,
2460                                         u16 reason)
2461 {
2462         struct ieee80211_event event = {
2463                 .type = MLME_EVENT,
2464                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2465                 .u.mlme.reason = reason,
2466         };
2467
2468         if (tx)
2469                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2470         else
2471                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2472
2473         drv_event_callback(sdata->local, sdata, &event);
2474 }
2475
2476 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2477 {
2478         struct ieee80211_local *local = sdata->local;
2479         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2480         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2481         bool tx;
2482
2483         sdata_lock(sdata);
2484         if (!ifmgd->associated) {
2485                 sdata_unlock(sdata);
2486                 return;
2487         }
2488
2489         tx = !sdata->csa_block_tx;
2490
2491         /* AP is probably out of range (or not reachable for another reason) so
2492          * remove the bss struct for that AP.
2493          */
2494         cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);
2495
2496         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2497                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2498                                tx, frame_buf);
2499         mutex_lock(&local->mtx);
2500         sdata->vif.csa_active = false;
2501         ifmgd->csa_waiting_bcn = false;
2502         if (sdata->csa_block_tx) {
2503                 ieee80211_wake_vif_queues(local, sdata,
2504                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2505                 sdata->csa_block_tx = false;
2506         }
2507         mutex_unlock(&local->mtx);
2508
2509         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), tx,
2510                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2511
2512         sdata_unlock(sdata);
2513 }
2514
2515 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2516 {
2517         struct ieee80211_sub_if_data *sdata =
2518                 container_of(work, struct ieee80211_sub_if_data,
2519                              u.mgd.beacon_connection_loss_work);
2520         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2521
2522         if (ifmgd->associated)
2523                 ifmgd->beacon_loss_count++;
2524
2525         if (ifmgd->connection_loss) {
2526                 sdata_info(sdata, "Connection to AP %pM lost\n",
2527                            ifmgd->bssid);
2528                 __ieee80211_disconnect(sdata);
2529         } else {
2530                 ieee80211_mgd_probe_ap(sdata, true);
2531         }
2532 }
2533
2534 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2535 {
2536         struct ieee80211_sub_if_data *sdata =
2537                 container_of(work, struct ieee80211_sub_if_data,
2538                              u.mgd.csa_connection_drop_work);
2539
2540         __ieee80211_disconnect(sdata);
2541 }
2542
2543 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2544 {
2545         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2546         struct ieee80211_hw *hw = &sdata->local->hw;
2547
2548         trace_api_beacon_loss(sdata);
2549
2550         sdata->u.mgd.connection_loss = false;
2551         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2552 }
2553 EXPORT_SYMBOL(ieee80211_beacon_loss);
2554
2555 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2556 {
2557         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2558         struct ieee80211_hw *hw = &sdata->local->hw;
2559
2560         trace_api_connection_loss(sdata);
2561
2562         sdata->u.mgd.connection_loss = true;
2563         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2564 }
2565 EXPORT_SYMBOL(ieee80211_connection_loss);
2566
2567
2568 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2569                                         bool assoc)
2570 {
2571         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2572
2573         sdata_assert_lock(sdata);
2574
2575         if (!assoc) {
2576                 /*
2577                  * we are not authenticated yet, the only timer that could be
2578                  * running is the timeout for the authentication response which
2579                  * which is not relevant anymore.
2580                  */
2581                 del_timer_sync(&sdata->u.mgd.timer);
2582                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2583
2584                 eth_zero_addr(sdata->u.mgd.bssid);
2585                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2586                 sdata->u.mgd.flags = 0;
2587                 mutex_lock(&sdata->local->mtx);
2588                 ieee80211_vif_release_channel(sdata);
2589                 mutex_unlock(&sdata->local->mtx);
2590         }
2591
2592         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2593         kfree(auth_data);
2594         sdata->u.mgd.auth_data = NULL;
2595 }
2596
2597 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2598                                          bool assoc, bool abandon)
2599 {
2600         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2601
2602         sdata_assert_lock(sdata);
2603
2604         if (!assoc) {
2605                 /*
2606                  * we are not associated yet, the only timer that could be
2607                  * running is the timeout for the association response which
2608                  * which is not relevant anymore.
2609                  */
2610                 del_timer_sync(&sdata->u.mgd.timer);
2611                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2612
2613                 eth_zero_addr(sdata->u.mgd.bssid);
2614                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2615                 sdata->u.mgd.flags = 0;
2616                 sdata->vif.mu_mimo_owner = false;
2617
2618                 mutex_lock(&sdata->local->mtx);
2619                 ieee80211_vif_release_channel(sdata);
2620                 mutex_unlock(&sdata->local->mtx);
2621
2622                 if (abandon)
2623                         cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2624         }
2625
2626         kfree(assoc_data);
2627         sdata->u.mgd.assoc_data = NULL;
2628 }
2629
2630 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2631                                      struct ieee80211_mgmt *mgmt, size_t len)
2632 {
2633         struct ieee80211_local *local = sdata->local;
2634         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2635         u8 *pos;
2636         struct ieee802_11_elems elems;
2637         u32 tx_flags = 0;
2638
2639         pos = mgmt->u.auth.variable;
2640         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2641         if (!elems.challenge)
2642                 return;
2643         auth_data->expected_transaction = 4;
2644         drv_mgd_prepare_tx(sdata->local, sdata);
2645         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2646                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2647                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2648         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2649                             elems.challenge - 2, elems.challenge_len + 2,
2650                             auth_data->bss->bssid, auth_data->bss->bssid,
2651                             auth_data->key, auth_data->key_len,
2652                             auth_data->key_idx, tx_flags);
2653 }
2654
2655 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2656                                    struct ieee80211_mgmt *mgmt, size_t len)
2657 {
2658         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2659         u8 bssid[ETH_ALEN];
2660         u16 auth_alg, auth_transaction, status_code;
2661         struct sta_info *sta;
2662         struct ieee80211_event event = {
2663                 .type = MLME_EVENT,
2664                 .u.mlme.data = AUTH_EVENT,
2665         };
2666
2667         sdata_assert_lock(sdata);
2668
2669         if (len < 24 + 6)
2670                 return;
2671
2672         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2673                 return;
2674
2675         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2676
2677         if (!ether_addr_equal(bssid, mgmt->bssid))
2678                 return;
2679
2680         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2681         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2682         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2683
2684         if (auth_alg != ifmgd->auth_data->algorithm ||
2685             auth_transaction != ifmgd->auth_data->expected_transaction) {
2686                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2687                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2688                            auth_transaction,
2689                            ifmgd->auth_data->expected_transaction);
2690                 return;
2691         }
2692
2693         if (status_code != WLAN_STATUS_SUCCESS) {
2694                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2695                            mgmt->sa, status_code);
2696                 ieee80211_destroy_auth_data(sdata, false);
2697                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2698                 event.u.mlme.status = MLME_DENIED;
2699                 event.u.mlme.reason = status_code;
2700                 drv_event_callback(sdata->local, sdata, &event);
2701                 return;
2702         }
2703
2704         switch (ifmgd->auth_data->algorithm) {
2705         case WLAN_AUTH_OPEN:
2706         case WLAN_AUTH_LEAP:
2707         case WLAN_AUTH_FT:
2708         case WLAN_AUTH_SAE:
2709                 break;
2710         case WLAN_AUTH_SHARED_KEY:
2711                 if (ifmgd->auth_data->expected_transaction != 4) {
2712                         ieee80211_auth_challenge(sdata, mgmt, len);
2713                         /* need another frame */
2714                         return;
2715                 }
2716                 break;
2717         default:
2718                 WARN_ONCE(1, "invalid auth alg %d",
2719                           ifmgd->auth_data->algorithm);
2720                 return;
2721         }
2722
2723         event.u.mlme.status = MLME_SUCCESS;
2724         drv_event_callback(sdata->local, sdata, &event);
2725         sdata_info(sdata, "authenticated\n");
2726         ifmgd->auth_data->done = true;
2727         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2728         ifmgd->auth_data->timeout_started = true;
2729         run_again(sdata, ifmgd->auth_data->timeout);
2730
2731         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2732             ifmgd->auth_data->expected_transaction != 2) {
2733                 /*
2734                  * Report auth frame to user space for processing since another
2735                  * round of Authentication frames is still needed.
2736                  */
2737                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2738                 return;
2739         }
2740
2741         /* move station state to auth */
2742         mutex_lock(&sdata->local->sta_mtx);
2743         sta = sta_info_get(sdata, bssid);
2744         if (!sta) {
2745                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2746                 goto out_err;
2747         }
2748         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2749                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2750                 goto out_err;
2751         }
2752         mutex_unlock(&sdata->local->sta_mtx);
2753
2754         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2755         return;
2756  out_err:
2757         mutex_unlock(&sdata->local->sta_mtx);
2758         /* ignore frame -- wait for timeout */
2759 }
2760
2761 #define case_WLAN(type) \
2762         case WLAN_REASON_##type: return #type
2763
2764 const char *ieee80211_get_reason_code_string(u16 reason_code)
2765 {
2766         switch (reason_code) {
2767         case_WLAN(UNSPECIFIED);
2768         case_WLAN(PREV_AUTH_NOT_VALID);
2769         case_WLAN(DEAUTH_LEAVING);
2770         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2771         case_WLAN(DISASSOC_AP_BUSY);
2772         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2773         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2774         case_WLAN(DISASSOC_STA_HAS_LEFT);
2775         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2776         case_WLAN(DISASSOC_BAD_POWER);
2777         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2778         case_WLAN(INVALID_IE);
2779         case_WLAN(MIC_FAILURE);
2780         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2781         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2782         case_WLAN(IE_DIFFERENT);
2783         case_WLAN(INVALID_GROUP_CIPHER);
2784         case_WLAN(INVALID_PAIRWISE_CIPHER);
2785         case_WLAN(INVALID_AKMP);
2786         case_WLAN(UNSUPP_RSN_VERSION);
2787         case_WLAN(INVALID_RSN_IE_CAP);
2788         case_WLAN(IEEE8021X_FAILED);
2789         case_WLAN(CIPHER_SUITE_REJECTED);
2790         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2791         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2792         case_WLAN(DISASSOC_LOW_ACK);
2793         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2794         case_WLAN(QSTA_LEAVE_QBSS);
2795         case_WLAN(QSTA_NOT_USE);
2796         case_WLAN(QSTA_REQUIRE_SETUP);
2797         case_WLAN(QSTA_TIMEOUT);
2798         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2799         case_WLAN(MESH_PEER_CANCELED);
2800         case_WLAN(MESH_MAX_PEERS);
2801         case_WLAN(MESH_CONFIG);
2802         case_WLAN(MESH_CLOSE);
2803         case_WLAN(MESH_MAX_RETRIES);
2804         case_WLAN(MESH_CONFIRM_TIMEOUT);
2805         case_WLAN(MESH_INVALID_GTK);
2806         case_WLAN(MESH_INCONSISTENT_PARAM);
2807         case_WLAN(MESH_INVALID_SECURITY);
2808         case_WLAN(MESH_PATH_ERROR);
2809         case_WLAN(MESH_PATH_NOFORWARD);
2810         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2811         case_WLAN(MAC_EXISTS_IN_MBSS);
2812         case_WLAN(MESH_CHAN_REGULATORY);
2813         case_WLAN(MESH_CHAN);
2814         default: return "<unknown>";
2815         }
2816 }
2817
2818 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2819                                      struct ieee80211_mgmt *mgmt, size_t len)
2820 {
2821         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2822         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2823
2824         sdata_assert_lock(sdata);
2825
2826         if (len < 24 + 2)
2827                 return;
2828
2829         if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) {
2830                 ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code);
2831                 return;
2832         }
2833
2834         if (ifmgd->associated &&
2835             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2836                 const u8 *bssid = ifmgd->associated->bssid;
2837
2838                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2839                            bssid, reason_code,
2840                            ieee80211_get_reason_code_string(reason_code));
2841
2842                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2843
2844                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2845                                             reason_code);
2846                 return;
2847         }
2848
2849         if (ifmgd->assoc_data &&
2850             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2851                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2852
2853                 sdata_info(sdata,
2854                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2855                            bssid, reason_code,
2856                            ieee80211_get_reason_code_string(reason_code));
2857
2858                 ieee80211_destroy_assoc_data(sdata, false, true);
2859
2860                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2861                 return;
2862         }
2863 }
2864
2865
2866 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2867                                        struct ieee80211_mgmt *mgmt, size_t len)
2868 {
2869         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2870         u16 reason_code;
2871
2872         sdata_assert_lock(sdata);
2873
2874         if (len < 24 + 2)
2875                 return;
2876
2877         if (!ifmgd->associated ||
2878             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2879                 return;
2880
2881         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2882
2883         if (!ether_addr_equal(mgmt->bssid, mgmt->sa)) {
2884                 ieee80211_tdls_handle_disconnect(sdata, mgmt->sa, reason_code);
2885                 return;
2886         }
2887
2888         sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
2889                    mgmt->sa, reason_code,
2890                    ieee80211_get_reason_code_string(reason_code));
2891
2892         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2893
2894         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2895 }
2896
2897 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2898                                 u8 *supp_rates, unsigned int supp_rates_len,
2899                                 u32 *rates, u32 *basic_rates,
2900                                 bool *have_higher_than_11mbit,
2901                                 int *min_rate, int *min_rate_index,
2902                                 int shift, u32 rate_flags)
2903 {
2904         int i, j;
2905
2906         for (i = 0; i < supp_rates_len; i++) {
2907                 int rate = supp_rates[i] & 0x7f;
2908                 bool is_basic = !!(supp_rates[i] & 0x80);
2909
2910                 if ((rate * 5 * (1 << shift)) > 110)
2911                         *have_higher_than_11mbit = true;
2912
2913                 /*
2914                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2915                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2916                  *
2917                  * Note: Even through the membership selector and the basic
2918                  *       rate flag share the same bit, they are not exactly
2919                  *       the same.
2920                  */
2921                 if (!!(supp_rates[i] & 0x80) &&
2922                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2923                         continue;
2924
2925                 for (j = 0; j < sband->n_bitrates; j++) {
2926                         struct ieee80211_rate *br;
2927                         int brate;
2928
2929                         br = &sband->bitrates[j];
2930                         if ((rate_flags & br->flags) != rate_flags)
2931                                 continue;
2932
2933                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2934                         if (brate == rate) {
2935                                 *rates |= BIT(j);
2936                                 if (is_basic)
2937                                         *basic_rates |= BIT(j);
2938                                 if ((rate * 5) < *min_rate) {
2939                                         *min_rate = rate * 5;
2940                                         *min_rate_index = j;
2941                                 }
2942                                 break;
2943                         }
2944                 }
2945         }
2946 }
2947
2948 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2949                                     struct cfg80211_bss *cbss,
2950                                     struct ieee80211_mgmt *mgmt, size_t len)
2951 {
2952         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2953         struct ieee80211_local *local = sdata->local;
2954         struct ieee80211_supported_band *sband;
2955         struct sta_info *sta;
2956         u8 *pos;
2957         u16 capab_info, aid;
2958         struct ieee802_11_elems elems;
2959         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2960         const struct cfg80211_bss_ies *bss_ies = NULL;
2961         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2962         u32 changed = 0;
2963         int err;
2964         bool ret;
2965
2966         /* AssocResp and ReassocResp have identical structure */
2967
2968         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2969         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2970
2971         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2972                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2973                            aid);
2974         aid &= ~(BIT(15) | BIT(14));
2975
2976         ifmgd->broken_ap = false;
2977
2978         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2979                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2980                            aid);
2981                 aid = 0;
2982                 ifmgd->broken_ap = true;
2983         }
2984
2985         pos = mgmt->u.assoc_resp.variable;
2986         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2987
2988         if (!elems.supp_rates) {
2989                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2990                 return false;
2991         }
2992
2993         ifmgd->aid = aid;
2994         ifmgd->tdls_chan_switch_prohibited =
2995                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2996                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2997
2998         /*
2999          * Some APs are erroneously not including some information in their
3000          * (re)association response frames. Try to recover by using the data
3001          * from the beacon or probe response. This seems to afflict mobile
3002          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
3003          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
3004          */
3005         if ((assoc_data->wmm && !elems.wmm_param) ||
3006             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3007              (!elems.ht_cap_elem || !elems.ht_operation)) ||
3008             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3009              (!elems.vht_cap_elem || !elems.vht_operation))) {
3010                 const struct cfg80211_bss_ies *ies;
3011                 struct ieee802_11_elems bss_elems;
3012
3013                 rcu_read_lock();
3014                 ies = rcu_dereference(cbss->ies);
3015                 if (ies)
3016                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
3017                                           GFP_ATOMIC);
3018                 rcu_read_unlock();
3019                 if (!bss_ies)
3020                         return false;
3021
3022                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
3023                                        false, &bss_elems);
3024                 if (assoc_data->wmm &&
3025                     !elems.wmm_param && bss_elems.wmm_param) {
3026                         elems.wmm_param = bss_elems.wmm_param;
3027                         sdata_info(sdata,
3028                                    "AP bug: WMM param missing from AssocResp\n");
3029                 }
3030
3031                 /*
3032                  * Also check if we requested HT/VHT, otherwise the AP doesn't
3033                  * have to include the IEs in the (re)association response.
3034                  */
3035                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
3036                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
3037                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
3038                         sdata_info(sdata,
3039                                    "AP bug: HT capability missing from AssocResp\n");
3040                 }
3041                 if (!elems.ht_operation && bss_elems.ht_operation &&
3042                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
3043                         elems.ht_operation = bss_elems.ht_operation;
3044                         sdata_info(sdata,
3045                                    "AP bug: HT operation missing from AssocResp\n");
3046                 }
3047                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
3048                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
3049                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
3050                         sdata_info(sdata,
3051                                    "AP bug: VHT capa missing from AssocResp\n");
3052                 }
3053                 if (!elems.vht_operation && bss_elems.vht_operation &&
3054                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
3055                         elems.vht_operation = bss_elems.vht_operation;
3056                         sdata_info(sdata,
3057                                    "AP bug: VHT operation missing from AssocResp\n");
3058                 }
3059         }
3060
3061         /*
3062          * We previously checked these in the beacon/probe response, so
3063          * they should be present here. This is just a safety net.
3064          */
3065         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3066             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
3067                 sdata_info(sdata,
3068                            "HT AP is missing WMM params or HT capability/operation\n");
3069                 ret = false;
3070                 goto out;
3071         }
3072
3073         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3074             (!elems.vht_cap_elem || !elems.vht_operation)) {
3075                 sdata_info(sdata,
3076                            "VHT AP is missing VHT capability/operation\n");
3077                 ret = false;
3078                 goto out;
3079         }
3080
3081         mutex_lock(&sdata->local->sta_mtx);
3082         /*
3083          * station info was already allocated and inserted before
3084          * the association and should be available to us
3085          */
3086         sta = sta_info_get(sdata, cbss->bssid);
3087         if (WARN_ON(!sta)) {
3088                 mutex_unlock(&sdata->local->sta_mtx);
3089                 ret = false;
3090                 goto out;
3091         }
3092
3093         sband = ieee80211_get_sband(sdata);
3094         if (!sband) {
3095                 mutex_unlock(&sdata->local->sta_mtx);
3096                 ret = false;
3097                 goto out;
3098         }
3099
3100         /* Set up internal HT/VHT capabilities */
3101         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3102                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3103                                                   elems.ht_cap_elem, sta);
3104
3105         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3106                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3107                                                     elems.vht_cap_elem, sta);
3108
3109         /*
3110          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3111          * in their association response, so ignore that data for our own
3112          * configuration. If it changed since the last beacon, we'll get the
3113          * next beacon and update then.
3114          */
3115
3116         /*
3117          * If an operating mode notification IE is present, override the
3118          * NSS calculation (that would be done in rate_control_rate_init())
3119          * and use the # of streams from that element.
3120          */
3121         if (elems.opmode_notif &&
3122             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3123                 u8 nss;
3124
3125                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3126                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3127                 nss += 1;
3128                 sta->sta.rx_nss = nss;
3129         }
3130
3131         rate_control_rate_init(sta);
3132
3133         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3134                 set_sta_flag(sta, WLAN_STA_MFP);
3135                 sta->sta.mfp = true;
3136         } else {
3137                 sta->sta.mfp = false;
3138         }
3139
3140         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3141
3142         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3143         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3144                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3145         if (err) {
3146                 sdata_info(sdata,
3147                            "failed to move station %pM to desired state\n",
3148                            sta->sta.addr);
3149                 WARN_ON(__sta_info_destroy(sta));
3150                 mutex_unlock(&sdata->local->sta_mtx);
3151                 ret = false;
3152                 goto out;
3153         }
3154
3155         mutex_unlock(&sdata->local->sta_mtx);
3156
3157         /*
3158          * Always handle WMM once after association regardless
3159          * of the first value the AP uses. Setting -1 here has
3160          * that effect because the AP values is an unsigned
3161          * 4-bit value.
3162          */
3163         ifmgd->wmm_last_param_set = -1;
3164
3165         if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3166                 ieee80211_set_wmm_default(sdata, false, false);
3167         } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3168                                              elems.wmm_param_len)) {
3169                 /* still enable QoS since we might have HT/VHT */
3170                 ieee80211_set_wmm_default(sdata, false, true);
3171                 /* set the disable-WMM flag in this case to disable
3172                  * tracking WMM parameter changes in the beacon if
3173                  * the parameters weren't actually valid. Doing so
3174                  * avoids changing parameters very strangely when
3175                  * the AP is going back and forth between valid and
3176                  * invalid parameters.
3177                  */
3178                 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3179         }
3180         changed |= BSS_CHANGED_QOS;
3181
3182         /* set AID and assoc capability,
3183          * ieee80211_set_associated() will tell the driver */
3184         bss_conf->aid = aid;
3185         bss_conf->assoc_capability = capab_info;
3186         ieee80211_set_associated(sdata, cbss, changed);
3187
3188         /*
3189          * If we're using 4-addr mode, let the AP know that we're
3190          * doing so, so that it can create the STA VLAN on its side
3191          */
3192         if (ifmgd->use_4addr)
3193                 ieee80211_send_4addr_nullfunc(local, sdata);
3194
3195         /*
3196          * Start timer to probe the connection to the AP now.
3197          * Also start the timer that will detect beacon loss.
3198          */
3199         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3200         ieee80211_sta_reset_beacon_monitor(sdata);
3201
3202         ret = true;
3203  out:
3204         kfree(bss_ies);
3205         return ret;
3206 }
3207
3208 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3209                                          struct ieee80211_mgmt *mgmt,
3210                                          size_t len)
3211 {
3212         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3213         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3214         u16 capab_info, status_code, aid;
3215         struct ieee802_11_elems elems;
3216         int ac, uapsd_queues = -1;
3217         u8 *pos;
3218         bool reassoc;
3219         struct cfg80211_bss *bss;
3220         struct ieee80211_event event = {
3221                 .type = MLME_EVENT,
3222                 .u.mlme.data = ASSOC_EVENT,
3223         };
3224
3225         sdata_assert_lock(sdata);
3226
3227         if (!assoc_data)
3228                 return;
3229         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3230                 return;
3231
3232         /*
3233          * AssocResp and ReassocResp have identical structure, so process both
3234          * of them in this function.
3235          */
3236
3237         if (len < 24 + 6)
3238                 return;
3239
3240         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3241         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3242         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3243         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3244
3245         sdata_info(sdata,
3246                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3247                    reassoc ? "Rea" : "A", mgmt->sa,
3248                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3249
3250         pos = mgmt->u.assoc_resp.variable;
3251         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3252
3253         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3254             elems.timeout_int &&
3255             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3256                 u32 tu, ms;
3257                 tu = le32_to_cpu(elems.timeout_int->value);
3258                 ms = tu * 1024 / 1000;
3259                 sdata_info(sdata,
3260                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3261                            mgmt->sa, tu, ms);
3262                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3263                 assoc_data->timeout_started = true;
3264                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3265                         run_again(sdata, assoc_data->timeout);
3266                 return;
3267         }
3268
3269         bss = assoc_data->bss;
3270
3271         if (status_code != WLAN_STATUS_SUCCESS) {
3272                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3273                            mgmt->sa, status_code);
3274                 ieee80211_destroy_assoc_data(sdata, false, false);
3275                 event.u.mlme.status = MLME_DENIED;
3276                 event.u.mlme.reason = status_code;
3277                 drv_event_callback(sdata->local, sdata, &event);
3278         } else {
3279                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3280                         /* oops -- internal error -- send timeout for now */
3281                         ieee80211_destroy_assoc_data(sdata, false, false);
3282                         cfg80211_assoc_timeout(sdata->dev, bss);
3283                         return;
3284                 }
3285                 event.u.mlme.status = MLME_SUCCESS;
3286                 drv_event_callback(sdata->local, sdata, &event);
3287                 sdata_info(sdata, "associated\n");
3288
3289                 /*
3290                  * destroy assoc_data afterwards, as otherwise an idle
3291                  * recalc after assoc_data is NULL but before associated
3292                  * is set can cause the interface to go idle
3293                  */
3294                 ieee80211_destroy_assoc_data(sdata, true, false);
3295
3296                 /* get uapsd queues configuration */
3297                 uapsd_queues = 0;
3298                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3299                         if (sdata->tx_conf[ac].uapsd)
3300                                 uapsd_queues |= BIT(ac);
3301         }
3302
3303         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3304 }
3305
3306 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3307                                   struct ieee80211_mgmt *mgmt, size_t len,
3308                                   struct ieee80211_rx_status *rx_status,
3309                                   struct ieee802_11_elems *elems)
3310 {
3311         struct ieee80211_local *local = sdata->local;
3312         struct ieee80211_bss *bss;
3313         struct ieee80211_channel *channel;
3314
3315         sdata_assert_lock(sdata);
3316
3317         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3318         if (!channel)
3319                 return;
3320
3321         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3322                                         channel);
3323         if (bss) {
3324                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3325                 ieee80211_rx_bss_put(local, bss);
3326         }
3327 }
3328
3329
3330 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3331                                          struct sk_buff *skb)
3332 {
3333         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3334         struct ieee80211_if_managed *ifmgd;
3335         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3336         size_t baselen, len = skb->len;
3337         struct ieee802_11_elems elems;
3338
3339         ifmgd = &sdata->u.mgd;
3340
3341         sdata_assert_lock(sdata);
3342
3343         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3344                 return; /* ignore ProbeResp to foreign address */
3345
3346         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3347         if (baselen > len)
3348                 return;
3349
3350         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3351                                false, &elems);
3352
3353         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3354
3355         if (ifmgd->associated &&
3356             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3357                 ieee80211_reset_ap_probe(sdata);
3358 }
3359
3360 /*
3361  * This is the canonical list of information elements we care about,
3362  * the filter code also gives us all changes to the Microsoft OUI
3363  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3364  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3365  * changes to requested client power.
3366  *
3367  * We implement beacon filtering in software since that means we can
3368  * avoid processing the frame here and in cfg80211, and userspace
3369  * will not be able to tell whether the hardware supports it or not.
3370  *
3371  * XXX: This list needs to be dynamic -- userspace needs to be able to
3372  *      add items it requires. It also needs to be able to tell us to
3373  *      look out for other vendor IEs.
3374  */
3375 static const u64 care_about_ies =
3376         (1ULL << WLAN_EID_COUNTRY) |
3377         (1ULL << WLAN_EID_ERP_INFO) |
3378         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3379         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3380         (1ULL << WLAN_EID_HT_CAPABILITY) |
3381         (1ULL << WLAN_EID_HT_OPERATION) |
3382         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3383
3384 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3385                                      struct ieee80211_mgmt *mgmt, size_t len,
3386                                      struct ieee80211_rx_status *rx_status)
3387 {
3388         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3389         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3390         size_t baselen;
3391         struct ieee802_11_elems elems;
3392         struct ieee80211_local *local = sdata->local;
3393         struct ieee80211_chanctx_conf *chanctx_conf;
3394         struct ieee80211_channel *chan;
3395         struct sta_info *sta;
3396         u32 changed = 0;
3397         bool erp_valid;
3398         u8 erp_value = 0;
3399         u32 ncrc;
3400         u8 *bssid;
3401         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3402
3403         sdata_assert_lock(sdata);
3404
3405         /* Process beacon from the current BSS */
3406         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3407         if (baselen > len)
3408                 return;
3409
3410         rcu_read_lock();
3411         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3412         if (!chanctx_conf) {
3413                 rcu_read_unlock();
3414                 return;
3415         }
3416
3417         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3418                 rcu_read_unlock();
3419                 return;
3420         }
3421         chan = chanctx_conf->def.chan;
3422         rcu_read_unlock();
3423
3424         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3425             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3426                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3427                                        len - baselen, false, &elems);
3428
3429                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3430                 if (elems.tim && !elems.parse_error) {
3431                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3432                         ifmgd->dtim_period = tim_ie->dtim_period;
3433                 }
3434                 ifmgd->have_beacon = true;
3435                 ifmgd->assoc_data->need_beacon = false;
3436                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3437                         sdata->vif.bss_conf.sync_tsf =
3438                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3439                         sdata->vif.bss_conf.sync_device_ts =
3440                                 rx_status->device_timestamp;
3441                         if (elems.tim)
3442                                 sdata->vif.bss_conf.sync_dtim_count =
3443                                         elems.tim->dtim_count;
3444                         else
3445                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3446                 }
3447                 /* continue assoc process */
3448                 ifmgd->assoc_data->timeout = jiffies;
3449                 ifmgd->assoc_data->timeout_started = true;
3450                 run_again(sdata, ifmgd->assoc_data->timeout);
3451                 return;
3452         }
3453
3454         if (!ifmgd->associated ||
3455             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3456                 return;
3457         bssid = ifmgd->associated->bssid;
3458
3459         /* Track average RSSI from the Beacon frames of the current AP */
3460         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3461                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3462                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3463                 ifmgd->last_cqm_event_signal = 0;
3464                 ifmgd->count_beacon_signal = 1;
3465                 ifmgd->last_ave_beacon_signal = 0;
3466         } else {
3467                 ifmgd->count_beacon_signal++;
3468         }
3469
3470         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3471
3472         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3473             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3474                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3475                 int last_sig = ifmgd->last_ave_beacon_signal;
3476                 struct ieee80211_event event = {
3477                         .type = RSSI_EVENT,
3478                 };
3479
3480                 /*
3481                  * if signal crosses either of the boundaries, invoke callback
3482                  * with appropriate parameters
3483                  */
3484                 if (sig > ifmgd->rssi_max_thold &&
3485                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3486                         ifmgd->last_ave_beacon_signal = sig;
3487                         event.u.rssi.data = RSSI_EVENT_HIGH;
3488                         drv_event_callback(local, sdata, &event);
3489                 } else if (sig < ifmgd->rssi_min_thold &&
3490                            (last_sig >= ifmgd->rssi_max_thold ||
3491                            last_sig == 0)) {
3492                         ifmgd->last_ave_beacon_signal = sig;
3493                         event.u.rssi.data = RSSI_EVENT_LOW;
3494                         drv_event_callback(local, sdata, &event);
3495                 }
3496         }
3497
3498         if (bss_conf->cqm_rssi_thold &&
3499             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3500             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3501                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3502                 int last_event = ifmgd->last_cqm_event_signal;
3503                 int thold = bss_conf->cqm_rssi_thold;
3504                 int hyst = bss_conf->cqm_rssi_hyst;
3505
3506                 if (sig < thold &&
3507                     (last_event == 0 || sig < last_event - hyst)) {
3508                         ifmgd->last_cqm_event_signal = sig;
3509                         ieee80211_cqm_rssi_notify(
3510                                 &sdata->vif,
3511                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3512                                 GFP_KERNEL);
3513                 } else if (sig > thold &&
3514                            (last_event == 0 || sig > last_event + hyst)) {
3515                         ifmgd->last_cqm_event_signal = sig;
3516                         ieee80211_cqm_rssi_notify(
3517                                 &sdata->vif,
3518                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3519                                 GFP_KERNEL);
3520                 }
3521         }
3522
3523         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3524                 mlme_dbg_ratelimited(sdata,
3525                                      "cancelling AP probe due to a received beacon\n");
3526                 ieee80211_reset_ap_probe(sdata);
3527         }
3528
3529         /*
3530          * Push the beacon loss detection into the future since
3531          * we are processing a beacon from the AP just now.
3532          */
3533         ieee80211_sta_reset_beacon_monitor(sdata);
3534
3535         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3536         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3537                                           len - baselen, false, &elems,
3538                                           care_about_ies, ncrc);
3539
3540         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3541             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3542                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3543                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3544                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3545                                 ieee80211_hw_config(local,
3546                                                     IEEE80211_CONF_CHANGE_PS);
3547                         }
3548                         ieee80211_send_nullfunc(local, sdata, false);
3549                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3550                         local->pspolling = true;
3551
3552                         /*
3553                          * Here is assumed that the driver will be
3554                          * able to send ps-poll frame and receive a
3555                          * response even though power save mode is
3556                          * enabled, but some drivers might require
3557                          * to disable power save here. This needs
3558                          * to be investigated.
3559                          */
3560                         ieee80211_send_pspoll(local, sdata);
3561                 }
3562         }
3563
3564         if (sdata->vif.p2p ||
3565             sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
3566                 struct ieee80211_p2p_noa_attr noa = {};
3567                 int ret;
3568
3569                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3570                                             len - baselen,
3571                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3572                                             (u8 *) &noa, sizeof(noa));
3573                 if (ret >= 2) {
3574                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3575                                 /* valid noa_attr and index changed */
3576                                 sdata->u.mgd.p2p_noa_index = noa.index;
3577                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3578                                 changed |= BSS_CHANGED_P2P_PS;
3579                                 /*
3580                                  * make sure we update all information, the CRC
3581                                  * mechanism doesn't look at P2P attributes.
3582                                  */
3583                                 ifmgd->beacon_crc_valid = false;
3584                         }
3585                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3586                         /* noa_attr not found and we had valid noa_attr before */
3587                         sdata->u.mgd.p2p_noa_index = -1;
3588                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3589                         changed |= BSS_CHANGED_P2P_PS;
3590                         ifmgd->beacon_crc_valid = false;
3591                 }
3592         }
3593
3594         if (ifmgd->csa_waiting_bcn)
3595                 ieee80211_chswitch_post_beacon(sdata);
3596
3597         /*
3598          * Update beacon timing and dtim count on every beacon appearance. This
3599          * will allow the driver to use the most updated values. Do it before
3600          * comparing this one with last received beacon.
3601          * IMPORTANT: These parameters would possibly be out of sync by the time
3602          * the driver will use them. The synchronized view is currently
3603          * guaranteed only in certain callbacks.
3604          */
3605         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3606                 sdata->vif.bss_conf.sync_tsf =
3607                         le64_to_cpu(mgmt->u.beacon.timestamp);
3608                 sdata->vif.bss_conf.sync_device_ts =
3609                         rx_status->device_timestamp;
3610                 if (elems.tim)
3611                         sdata->vif.bss_conf.sync_dtim_count =
3612                                 elems.tim->dtim_count;
3613                 else
3614                         sdata->vif.bss_conf.sync_dtim_count = 0;
3615         }
3616
3617         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3618                 return;
3619         ifmgd->beacon_crc = ncrc;
3620         ifmgd->beacon_crc_valid = true;
3621
3622         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3623
3624         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3625                                          rx_status->device_timestamp,
3626                                          &elems, true);
3627
3628         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3629             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3630                                      elems.wmm_param_len))
3631                 changed |= BSS_CHANGED_QOS;
3632
3633         /*
3634          * If we haven't had a beacon before, tell the driver about the
3635          * DTIM period (and beacon timing if desired) now.
3636          */
3637         if (!ifmgd->have_beacon) {
3638                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3639                 if (elems.tim)
3640                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3641                 else
3642                         bss_conf->dtim_period = 1;
3643
3644                 changed |= BSS_CHANGED_BEACON_INFO;
3645                 ifmgd->have_beacon = true;
3646
3647                 mutex_lock(&local->iflist_mtx);
3648                 ieee80211_recalc_ps(local);
3649                 mutex_unlock(&local->iflist_mtx);
3650
3651                 ieee80211_recalc_ps_vif(sdata);
3652         }
3653
3654         if (elems.erp_info) {
3655                 erp_valid = true;
3656                 erp_value = elems.erp_info[0];
3657         } else {
3658                 erp_valid = false;
3659         }
3660         changed |= ieee80211_handle_bss_capability(sdata,
3661                         le16_to_cpu(mgmt->u.beacon.capab_info),
3662                         erp_valid, erp_value);
3663
3664         mutex_lock(&local->sta_mtx);
3665         sta = sta_info_get(sdata, bssid);
3666
3667         if (ieee80211_config_bw(sdata, sta,
3668                                 elems.ht_cap_elem, elems.ht_operation,
3669                                 elems.vht_operation, bssid, &changed)) {
3670                 mutex_unlock(&local->sta_mtx);
3671                 sdata_info(sdata,
3672                            "failed to follow AP %pM bandwidth change, disconnect\n",
3673                            bssid);
3674                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3675                                        WLAN_REASON_DEAUTH_LEAVING,
3676                                        true, deauth_buf);
3677                 ieee80211_report_disconnect(sdata, deauth_buf,
3678                                             sizeof(deauth_buf), true,
3679                                             WLAN_REASON_DEAUTH_LEAVING);
3680                 return;
3681         }
3682
3683         if (sta && elems.opmode_notif)
3684                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3685                                             rx_status->band);
3686         mutex_unlock(&local->sta_mtx);
3687
3688         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3689                                                elems.country_elem,
3690                                                elems.country_elem_len,
3691                                                elems.pwr_constr_elem,
3692                                                elems.cisco_dtpc_elem);
3693
3694         ieee80211_bss_info_change_notify(sdata, changed);
3695 }
3696
3697 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3698                                   struct sk_buff *skb)
3699 {
3700         struct ieee80211_rx_status *rx_status;
3701         struct ieee80211_mgmt *mgmt;
3702         u16 fc;
3703         struct ieee802_11_elems elems;
3704         int ies_len;
3705
3706         rx_status = (struct ieee80211_rx_status *) skb->cb;
3707         mgmt = (struct ieee80211_mgmt *) skb->data;
3708         fc = le16_to_cpu(mgmt->frame_control);
3709
3710         sdata_lock(sdata);
3711
3712         switch (fc & IEEE80211_FCTL_STYPE) {
3713         case IEEE80211_STYPE_BEACON:
3714                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3715                 break;
3716         case IEEE80211_STYPE_PROBE_RESP:
3717                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3718                 break;
3719         case IEEE80211_STYPE_AUTH:
3720                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3721                 break;
3722         case IEEE80211_STYPE_DEAUTH:
3723                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3724                 break;
3725         case IEEE80211_STYPE_DISASSOC:
3726                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3727                 break;
3728         case IEEE80211_STYPE_ASSOC_RESP:
3729         case IEEE80211_STYPE_REASSOC_RESP:
3730                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3731                 break;
3732         case IEEE80211_STYPE_ACTION:
3733                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3734                         ies_len = skb->len -
3735                                   offsetof(struct ieee80211_mgmt,
3736                                            u.action.u.chan_switch.variable);
3737
3738                         if (ies_len < 0)
3739                                 break;
3740
3741                         ieee802_11_parse_elems(
3742                                 mgmt->u.action.u.chan_switch.variable,
3743                                 ies_len, true, &elems);
3744
3745                         if (elems.parse_error)
3746                                 break;
3747
3748                         ieee80211_sta_process_chanswitch(sdata,
3749                                                  rx_status->mactime,
3750                                                  rx_status->device_timestamp,
3751                                                  &elems, false);
3752                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3753                         ies_len = skb->len -
3754                                   offsetof(struct ieee80211_mgmt,
3755                                            u.action.u.ext_chan_switch.variable);
3756
3757                         if (ies_len < 0)
3758                                 break;
3759
3760                         ieee802_11_parse_elems(
3761                                 mgmt->u.action.u.ext_chan_switch.variable,
3762                                 ies_len, true, &elems);
3763
3764                         if (elems.parse_error)
3765                                 break;
3766
3767                         /* for the handling code pretend this was also an IE */
3768                         elems.ext_chansw_ie =
3769                                 &mgmt->u.action.u.ext_chan_switch.data;
3770
3771                         ieee80211_sta_process_chanswitch(sdata,
3772                                                  rx_status->mactime,
3773                                                  rx_status->device_timestamp,
3774                                                  &elems, false);
3775                 }
3776                 break;
3777         }
3778         sdata_unlock(sdata);
3779 }
3780
3781 static void ieee80211_sta_timer(unsigned long data)
3782 {
3783         struct ieee80211_sub_if_data *sdata =
3784                 (struct ieee80211_sub_if_data *) data;
3785
3786         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3787 }
3788
3789 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3790                                           u8 *bssid, u8 reason, bool tx)
3791 {
3792         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3793
3794         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3795                                tx, frame_buf);
3796
3797         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3798                                     reason);
3799 }
3800
3801 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3802 {
3803         struct ieee80211_local *local = sdata->local;
3804         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3805         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3806         u32 tx_flags = 0;
3807         u16 trans = 1;
3808         u16 status = 0;
3809
3810         sdata_assert_lock(sdata);
3811
3812         if (WARN_ON_ONCE(!auth_data))
3813                 return -EINVAL;
3814
3815         auth_data->tries++;
3816
3817         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3818                 sdata_info(sdata, "authentication with %pM timed out\n",
3819                            auth_data->bss->bssid);
3820
3821                 /*
3822                  * Most likely AP is not in the range so remove the
3823                  * bss struct for that AP.
3824                  */
3825                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3826
3827                 return -ETIMEDOUT;
3828         }
3829
3830         drv_mgd_prepare_tx(local, sdata);
3831
3832         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3833                    auth_data->bss->bssid, auth_data->tries,
3834                    IEEE80211_AUTH_MAX_TRIES);
3835
3836         auth_data->expected_transaction = 2;
3837
3838         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3839                 trans = auth_data->sae_trans;
3840                 status = auth_data->sae_status;
3841                 auth_data->expected_transaction = trans;
3842         }
3843
3844         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3845                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3846                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3847
3848         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3849                             auth_data->data, auth_data->data_len,
3850                             auth_data->bss->bssid,
3851                             auth_data->bss->bssid, NULL, 0, 0,
3852                             tx_flags);
3853
3854         if (tx_flags == 0) {
3855                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3856                 auth_data->timeout_started = true;
3857                 run_again(sdata, auth_data->timeout);
3858         } else {
3859                 auth_data->timeout =
3860                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3861                 auth_data->timeout_started = true;
3862                 run_again(sdata, auth_data->timeout);
3863         }
3864
3865         return 0;
3866 }
3867
3868 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3869 {
3870         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3871         struct ieee80211_local *local = sdata->local;
3872
3873         sdata_assert_lock(sdata);
3874
3875         assoc_data->tries++;
3876         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3877                 sdata_info(sdata, "association with %pM timed out\n",
3878                            assoc_data->bss->bssid);
3879
3880                 /*
3881                  * Most likely AP is not in the range so remove the
3882                  * bss struct for that AP.
3883                  */
3884                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3885
3886                 return -ETIMEDOUT;
3887         }
3888
3889         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3890                    assoc_data->bss->bssid, assoc_data->tries,
3891                    IEEE80211_ASSOC_MAX_TRIES);
3892         ieee80211_send_assoc(sdata);
3893
3894         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3895                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3896                 assoc_data->timeout_started = true;
3897                 run_again(sdata, assoc_data->timeout);
3898         } else {
3899                 assoc_data->timeout =
3900                         round_jiffies_up(jiffies +
3901                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3902                 assoc_data->timeout_started = true;
3903                 run_again(sdata, assoc_data->timeout);
3904         }
3905
3906         return 0;
3907 }
3908
3909 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3910                                   __le16 fc, bool acked)
3911 {
3912         struct ieee80211_local *local = sdata->local;
3913
3914         sdata->u.mgd.status_fc = fc;
3915         sdata->u.mgd.status_acked = acked;
3916         sdata->u.mgd.status_received = true;
3917
3918         ieee80211_queue_work(&local->hw, &sdata->work);
3919 }
3920
3921 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3922 {
3923         struct ieee80211_local *local = sdata->local;
3924         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3925
3926         sdata_lock(sdata);
3927
3928         if (ifmgd->status_received) {
3929                 __le16 fc = ifmgd->status_fc;
3930                 bool status_acked = ifmgd->status_acked;
3931
3932                 ifmgd->status_received = false;
3933                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3934                         if (status_acked) {
3935                                 ifmgd->auth_data->timeout =
3936                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3937                                 run_again(sdata, ifmgd->auth_data->timeout);
3938                         } else {
3939                                 ifmgd->auth_data->timeout = jiffies - 1;
3940                         }
3941                         ifmgd->auth_data->timeout_started = true;
3942                 } else if (ifmgd->assoc_data &&
3943                            (ieee80211_is_assoc_req(fc) ||
3944                             ieee80211_is_reassoc_req(fc))) {
3945                         if (status_acked) {
3946                                 ifmgd->assoc_data->timeout =
3947                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3948                                 run_again(sdata, ifmgd->assoc_data->timeout);
3949                         } else {
3950                                 ifmgd->assoc_data->timeout = jiffies - 1;
3951                         }
3952                         ifmgd->assoc_data->timeout_started = true;
3953                 }
3954         }
3955
3956         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3957             time_after(jiffies, ifmgd->auth_data->timeout)) {
3958                 if (ifmgd->auth_data->done) {
3959                         /*
3960                          * ok ... we waited for assoc but userspace didn't,
3961                          * so let's just kill the auth data
3962                          */
3963                         ieee80211_destroy_auth_data(sdata, false);
3964                 } else if (ieee80211_auth(sdata)) {
3965                         u8 bssid[ETH_ALEN];
3966                         struct ieee80211_event event = {
3967                                 .type = MLME_EVENT,
3968                                 .u.mlme.data = AUTH_EVENT,
3969                                 .u.mlme.status = MLME_TIMEOUT,
3970                         };
3971
3972                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3973
3974                         ieee80211_destroy_auth_data(sdata, false);
3975
3976                         cfg80211_auth_timeout(sdata->dev, bssid);
3977                         drv_event_callback(sdata->local, sdata, &event);
3978                 }
3979         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3980                 run_again(sdata, ifmgd->auth_data->timeout);
3981
3982         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3983             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3984                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3985                     ieee80211_do_assoc(sdata)) {
3986                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3987                         struct ieee80211_event event = {
3988                                 .type = MLME_EVENT,
3989                                 .u.mlme.data = ASSOC_EVENT,
3990                                 .u.mlme.status = MLME_TIMEOUT,
3991                         };
3992
3993                         ieee80211_destroy_assoc_data(sdata, false, false);
3994                         cfg80211_assoc_timeout(sdata->dev, bss);
3995                         drv_event_callback(sdata->local, sdata, &event);
3996                 }
3997         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3998                 run_again(sdata, ifmgd->assoc_data->timeout);
3999
4000         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
4001             ifmgd->associated) {
4002                 u8 bssid[ETH_ALEN];
4003                 int max_tries;
4004
4005                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4006
4007                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
4008                         max_tries = max_nullfunc_tries;
4009                 else
4010                         max_tries = max_probe_tries;
4011
4012                 /* ACK received for nullfunc probing frame */
4013                 if (!ifmgd->probe_send_count)
4014                         ieee80211_reset_ap_probe(sdata);
4015                 else if (ifmgd->nullfunc_failed) {
4016                         if (ifmgd->probe_send_count < max_tries) {
4017                                 mlme_dbg(sdata,
4018                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
4019                                          bssid, ifmgd->probe_send_count,
4020                                          max_tries);
4021                                 ieee80211_mgd_probe_ap_send(sdata);
4022                         } else {
4023                                 mlme_dbg(sdata,
4024                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
4025                                          bssid);
4026                                 ieee80211_sta_connection_lost(sdata, bssid,
4027                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
4028                                         false);
4029                         }
4030                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
4031                         run_again(sdata, ifmgd->probe_timeout);
4032                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
4033                         mlme_dbg(sdata,
4034                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
4035                                  bssid, probe_wait_ms);
4036                         ieee80211_sta_connection_lost(sdata, bssid,
4037                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4038                 } else if (ifmgd->probe_send_count < max_tries) {
4039                         mlme_dbg(sdata,
4040                                  "No probe response from AP %pM after %dms, try %d/%i\n",
4041                                  bssid, probe_wait_ms,
4042                                  ifmgd->probe_send_count, max_tries);
4043                         ieee80211_mgd_probe_ap_send(sdata);
4044                 } else {
4045                         /*
4046                          * We actually lost the connection ... or did we?
4047                          * Let's make sure!
4048                          */
4049                         mlme_dbg(sdata,
4050                                  "No probe response from AP %pM after %dms, disconnecting.\n",
4051                                  bssid, probe_wait_ms);
4052
4053                         ieee80211_sta_connection_lost(sdata, bssid,
4054                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4055                 }
4056         }
4057
4058         sdata_unlock(sdata);
4059 }
4060
4061 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
4062 {
4063         struct ieee80211_sub_if_data *sdata =
4064                 (struct ieee80211_sub_if_data *) data;
4065         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4066
4067         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4068                 return;
4069
4070         sdata->u.mgd.connection_loss = false;
4071         ieee80211_queue_work(&sdata->local->hw,
4072                              &sdata->u.mgd.beacon_connection_loss_work);
4073 }
4074
4075 static void ieee80211_sta_conn_mon_timer(unsigned long data)
4076 {
4077         struct ieee80211_sub_if_data *sdata =
4078                 (struct ieee80211_sub_if_data *) data;
4079         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4080         struct ieee80211_local *local = sdata->local;
4081
4082         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4083                 return;
4084
4085         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4086 }
4087
4088 static void ieee80211_sta_monitor_work(struct work_struct *work)
4089 {
4090         struct ieee80211_sub_if_data *sdata =
4091                 container_of(work, struct ieee80211_sub_if_data,
4092                              u.mgd.monitor_work);
4093
4094         ieee80211_mgd_probe_ap(sdata, false);
4095 }
4096
4097 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4098 {
4099         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4100                 __ieee80211_stop_poll(sdata);
4101
4102                 /* let's probe the connection once */
4103                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4104                         ieee80211_queue_work(&sdata->local->hw,
4105                                              &sdata->u.mgd.monitor_work);
4106         }
4107 }
4108
4109 #ifdef CONFIG_PM
4110 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4111 {
4112         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4113         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4114
4115         sdata_lock(sdata);
4116
4117         if (ifmgd->auth_data || ifmgd->assoc_data) {
4118                 const u8 *bssid = ifmgd->auth_data ?
4119                                 ifmgd->auth_data->bss->bssid :
4120                                 ifmgd->assoc_data->bss->bssid;
4121
4122                 /*
4123                  * If we are trying to authenticate / associate while suspending,
4124                  * cfg80211 won't know and won't actually abort those attempts,
4125                  * thus we need to do that ourselves.
4126                  */
4127                 ieee80211_send_deauth_disassoc(sdata, bssid,
4128                                                IEEE80211_STYPE_DEAUTH,
4129                                                WLAN_REASON_DEAUTH_LEAVING,
4130                                                false, frame_buf);
4131                 if (ifmgd->assoc_data)
4132                         ieee80211_destroy_assoc_data(sdata, false, true);
4133                 if (ifmgd->auth_data)
4134                         ieee80211_destroy_auth_data(sdata, false);
4135                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4136                                       IEEE80211_DEAUTH_FRAME_LEN);
4137         }
4138
4139         /* This is a bit of a hack - we should find a better and more generic
4140          * solution to this. Normally when suspending, cfg80211 will in fact
4141          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4142          * auth (not so important) or assoc (this is the problem) process.
4143          *
4144          * As a consequence, it can happen that we are in the process of both
4145          * associating and suspending, and receive an association response
4146          * after cfg80211 has checked if it needs to disconnect, but before
4147          * we actually set the flag to drop incoming frames. This will then
4148          * cause the workqueue flush to process the association response in
4149          * the suspend, resulting in a successful association just before it
4150          * tries to remove the interface from the driver, which now though
4151          * has a channel context assigned ... this results in issues.
4152          *
4153          * To work around this (for now) simply deauth here again if we're
4154          * now connected.
4155          */
4156         if (ifmgd->associated && !sdata->local->wowlan) {
4157                 u8 bssid[ETH_ALEN];
4158                 struct cfg80211_deauth_request req = {
4159                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4160                         .bssid = bssid,
4161                 };
4162
4163                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4164                 ieee80211_mgd_deauth(sdata, &req);
4165         }
4166
4167         sdata_unlock(sdata);
4168 }
4169
4170 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4171 {
4172         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4173
4174         sdata_lock(sdata);
4175         if (!ifmgd->associated) {
4176                 sdata_unlock(sdata);
4177                 return;
4178         }
4179
4180         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4181                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4182                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4183                 ieee80211_sta_connection_lost(sdata,
4184                                               ifmgd->associated->bssid,
4185                                               WLAN_REASON_UNSPECIFIED,
4186                                               true);
4187                 sdata_unlock(sdata);
4188                 return;
4189         }
4190         sdata_unlock(sdata);
4191 }
4192 #endif
4193
4194 /* interface setup */
4195 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4196 {
4197         struct ieee80211_if_managed *ifmgd;
4198
4199         ifmgd = &sdata->u.mgd;
4200         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4201         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4202         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4203                   ieee80211_beacon_connection_loss_work);
4204         INIT_WORK(&ifmgd->csa_connection_drop_work,
4205                   ieee80211_csa_connection_drop_work);
4206         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4207         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4208                           ieee80211_tdls_peer_del_work);
4209         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4210                     (unsigned long) sdata);
4211         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4212                     (unsigned long) sdata);
4213         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4214                     (unsigned long) sdata);
4215         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4216                     (unsigned long) sdata);
4217         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4218                           ieee80211_sta_handle_tspec_ac_params_wk);
4219
4220         ifmgd->flags = 0;
4221         ifmgd->powersave = sdata->wdev.ps;
4222         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4223         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4224         ifmgd->p2p_noa_index = -1;
4225
4226         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4227                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4228         else
4229                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4230
4231         /* Setup TDLS data */
4232         spin_lock_init(&ifmgd->teardown_lock);
4233         ifmgd->teardown_skb = NULL;
4234         ifmgd->orig_teardown_skb = NULL;
4235 }
4236
4237 /* scan finished notification */
4238 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4239 {
4240         struct ieee80211_sub_if_data *sdata;
4241
4242         /* Restart STA timers */
4243         rcu_read_lock();
4244         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4245                 if (ieee80211_sdata_running(sdata))
4246                         ieee80211_restart_sta_timer(sdata);
4247         }
4248         rcu_read_unlock();
4249 }
4250
4251 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4252                                      struct cfg80211_bss *cbss)
4253 {
4254         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4255         const u8 *ht_cap_ie, *vht_cap_ie;
4256         const struct ieee80211_ht_cap *ht_cap;
4257         const struct ieee80211_vht_cap *vht_cap;
4258         u8 chains = 1;
4259
4260         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4261                 return chains;
4262
4263         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4264         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4265                 ht_cap = (void *)(ht_cap_ie + 2);
4266                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4267                 /*
4268                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4269                  *       "Tx Unequal Modulation Supported" fields.
4270                  */
4271         }
4272
4273         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4274                 return chains;
4275
4276         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4277         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4278                 u8 nss;
4279                 u16 tx_mcs_map;
4280
4281                 vht_cap = (void *)(vht_cap_ie + 2);
4282                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4283                 for (nss = 8; nss > 0; nss--) {
4284                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4285                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4286                                 break;
4287                 }
4288                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4289                 chains = max(chains, nss);
4290         }
4291
4292         return chains;
4293 }
4294
4295 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4296                                   struct cfg80211_bss *cbss)
4297 {
4298         struct ieee80211_local *local = sdata->local;
4299         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4300         const struct ieee80211_ht_cap *ht_cap = NULL;
4301         const struct ieee80211_ht_operation *ht_oper = NULL;
4302         const struct ieee80211_vht_operation *vht_oper = NULL;
4303         struct ieee80211_supported_band *sband;
4304         struct cfg80211_chan_def chandef;
4305         int ret;
4306         u32 i;
4307         bool have_80mhz;
4308
4309         sband = local->hw.wiphy->bands[cbss->channel->band];
4310
4311         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4312                           IEEE80211_STA_DISABLE_80P80MHZ |
4313                           IEEE80211_STA_DISABLE_160MHZ);
4314
4315         rcu_read_lock();
4316
4317         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4318             sband->ht_cap.ht_supported) {
4319                 const u8 *ht_oper_ie, *ht_cap_ie;
4320
4321                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4322                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4323                         ht_oper = (void *)(ht_oper_ie + 2);
4324
4325                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4326                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4327                         ht_cap = (void *)(ht_cap_ie + 2);
4328
4329                 if (!ht_cap) {
4330                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4331                         ht_oper = NULL;
4332                 }
4333         }
4334
4335         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4336             sband->vht_cap.vht_supported) {
4337                 const u8 *vht_oper_ie, *vht_cap;
4338
4339                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4340                                                    WLAN_EID_VHT_OPERATION);
4341                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4342                         vht_oper = (void *)(vht_oper_ie + 2);
4343                 if (vht_oper && !ht_oper) {
4344                         vht_oper = NULL;
4345                         sdata_info(sdata,
4346                                    "AP advertised VHT without HT, disabling both\n");
4347                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4348                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4349                 }
4350
4351                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4352                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4353                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4354                         vht_oper = NULL;
4355                 }
4356         }
4357
4358         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4359         have_80mhz = false;
4360         for (i = 0; i < sband->n_channels; i++) {
4361                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4362                                                 IEEE80211_CHAN_NO_80MHZ))
4363                         continue;
4364
4365                 have_80mhz = true;
4366                 break;
4367         }
4368
4369         if (!have_80mhz)
4370                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4371
4372         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4373                                                      cbss->channel,
4374                                                      ht_cap, ht_oper, vht_oper,
4375                                                      &chandef, false);
4376
4377         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4378                                       local->rx_chains);
4379
4380         rcu_read_unlock();
4381
4382         /* will change later if needed */
4383         sdata->smps_mode = IEEE80211_SMPS_OFF;
4384
4385         mutex_lock(&local->mtx);
4386         /*
4387          * If this fails (possibly due to channel context sharing
4388          * on incompatible channels, e.g. 80+80 and 160 sharing the
4389          * same control channel) try to use a smaller bandwidth.
4390          */
4391         ret = ieee80211_vif_use_channel(sdata, &chandef,
4392                                         IEEE80211_CHANCTX_SHARED);
4393
4394         /* don't downgrade for 5 and 10 MHz channels, though. */
4395         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4396             chandef.width == NL80211_CHAN_WIDTH_10)
4397                 goto out;
4398
4399         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4400                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4401                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4402                                                 IEEE80211_CHANCTX_SHARED);
4403         }
4404  out:
4405         mutex_unlock(&local->mtx);
4406         return ret;
4407 }
4408
4409 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4410                                      struct cfg80211_bss *cbss, bool assoc,
4411                                      bool override)
4412 {
4413         struct ieee80211_local *local = sdata->local;
4414         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4415         struct ieee80211_bss *bss = (void *)cbss->priv;
4416         struct sta_info *new_sta = NULL;
4417         struct ieee80211_supported_band *sband;
4418         bool have_sta = false;
4419         int err;
4420
4421         sband = local->hw.wiphy->bands[cbss->channel->band];
4422
4423         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4424                 return -EINVAL;
4425
4426         /* If a reconfig is happening, bail out */
4427         if (local->in_reconfig)
4428                 return -EBUSY;
4429
4430         if (assoc) {
4431                 rcu_read_lock();
4432                 have_sta = sta_info_get(sdata, cbss->bssid);
4433                 rcu_read_unlock();
4434         }
4435
4436         if (!have_sta) {
4437                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4438                 if (!new_sta)
4439                         return -ENOMEM;
4440         }
4441
4442         if (new_sta || override) {
4443                 err = ieee80211_prep_channel(sdata, cbss);
4444                 if (err) {
4445                         if (new_sta)
4446                                 sta_info_free(local, new_sta);
4447                         return -EINVAL;
4448                 }
4449         }
4450
4451         if (new_sta) {
4452                 u32 rates = 0, basic_rates = 0;
4453                 bool have_higher_than_11mbit = false;
4454                 int min_rate = INT_MAX, min_rate_index = -1;
4455                 struct ieee80211_chanctx_conf *chanctx_conf;
4456                 const struct cfg80211_bss_ies *ies;
4457                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4458                 u32 rate_flags;
4459
4460                 rcu_read_lock();
4461                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4462                 if (WARN_ON(!chanctx_conf)) {
4463                         rcu_read_unlock();
4464                         sta_info_free(local, new_sta);
4465                         return -EINVAL;
4466                 }
4467                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4468                 rcu_read_unlock();
4469
4470                 ieee80211_get_rates(sband, bss->supp_rates,
4471                                     bss->supp_rates_len,
4472                                     &rates, &basic_rates,
4473                                     &have_higher_than_11mbit,
4474                                     &min_rate, &min_rate_index,
4475                                     shift, rate_flags);
4476
4477                 /*
4478                  * This used to be a workaround for basic rates missing
4479                  * in the association response frame. Now that we no
4480                  * longer use the basic rates from there, it probably
4481                  * doesn't happen any more, but keep the workaround so
4482                  * in case some *other* APs are buggy in different ways
4483                  * we can connect -- with a warning.
4484                  */
4485                 if (!basic_rates && min_rate_index >= 0) {
4486                         sdata_info(sdata,
4487                                    "No basic rates, using min rate instead\n");
4488                         basic_rates = BIT(min_rate_index);
4489                 }
4490
4491                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4492                 sdata->vif.bss_conf.basic_rates = basic_rates;
4493
4494                 /* cf. IEEE 802.11 9.2.12 */
4495                 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4496                     have_higher_than_11mbit)
4497                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4498                 else
4499                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4500
4501                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4502
4503                 /* set timing information */
4504                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4505                 rcu_read_lock();
4506                 ies = rcu_dereference(cbss->beacon_ies);
4507                 if (ies) {
4508                         const u8 *tim_ie;
4509
4510                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4511                         sdata->vif.bss_conf.sync_device_ts =
4512                                 bss->device_ts_beacon;
4513                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4514                                                   ies->data, ies->len);
4515                         if (tim_ie && tim_ie[1] >= 2)
4516                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4517                         else
4518                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4519                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4520                                                TIMING_BEACON_ONLY)) {
4521                         ies = rcu_dereference(cbss->proberesp_ies);
4522                         /* must be non-NULL since beacon IEs were NULL */
4523                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4524                         sdata->vif.bss_conf.sync_device_ts =
4525                                 bss->device_ts_presp;
4526                         sdata->vif.bss_conf.sync_dtim_count = 0;
4527                 } else {
4528                         sdata->vif.bss_conf.sync_tsf = 0;
4529                         sdata->vif.bss_conf.sync_device_ts = 0;
4530                         sdata->vif.bss_conf.sync_dtim_count = 0;
4531                 }
4532                 rcu_read_unlock();
4533
4534                 /* tell driver about BSSID, basic rates and timing */
4535                 ieee80211_bss_info_change_notify(sdata,
4536                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4537                         BSS_CHANGED_BEACON_INT);
4538
4539                 if (assoc)
4540                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4541
4542                 err = sta_info_insert(new_sta);
4543                 new_sta = NULL;
4544                 if (err) {
4545                         sdata_info(sdata,
4546                                    "failed to insert STA entry for the AP (error %d)\n",
4547                                    err);
4548                         return err;
4549                 }
4550         } else
4551                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4552
4553         /* Cancel scan to ensure that nothing interferes with connection */
4554         if (local->scanning)
4555                 ieee80211_scan_cancel(local);
4556
4557         return 0;
4558 }
4559
4560 /* config hooks */
4561 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4562                        struct cfg80211_auth_request *req)
4563 {
4564         struct ieee80211_local *local = sdata->local;
4565         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4566         struct ieee80211_mgd_auth_data *auth_data;
4567         u16 auth_alg;
4568         int err;
4569
4570         /* prepare auth data structure */
4571
4572         switch (req->auth_type) {
4573         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4574                 auth_alg = WLAN_AUTH_OPEN;
4575                 break;
4576         case NL80211_AUTHTYPE_SHARED_KEY:
4577                 if (IS_ERR(local->wep_tx_tfm))
4578                         return -EOPNOTSUPP;
4579                 auth_alg = WLAN_AUTH_SHARED_KEY;
4580                 break;
4581         case NL80211_AUTHTYPE_FT:
4582                 auth_alg = WLAN_AUTH_FT;
4583                 break;
4584         case NL80211_AUTHTYPE_NETWORK_EAP:
4585                 auth_alg = WLAN_AUTH_LEAP;
4586                 break;
4587         case NL80211_AUTHTYPE_SAE:
4588                 auth_alg = WLAN_AUTH_SAE;
4589                 break;
4590         default:
4591                 return -EOPNOTSUPP;
4592         }
4593
4594         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4595                             req->ie_len, GFP_KERNEL);
4596         if (!auth_data)
4597                 return -ENOMEM;
4598
4599         auth_data->bss = req->bss;
4600
4601         if (req->sae_data_len >= 4) {
4602                 __le16 *pos = (__le16 *) req->sae_data;
4603                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4604                 auth_data->sae_status = le16_to_cpu(pos[1]);
4605                 memcpy(auth_data->data, req->sae_data + 4,
4606                        req->sae_data_len - 4);
4607                 auth_data->data_len += req->sae_data_len - 4;
4608         }
4609
4610         if (req->ie && req->ie_len) {
4611                 memcpy(&auth_data->data[auth_data->data_len],
4612                        req->ie, req->ie_len);
4613                 auth_data->data_len += req->ie_len;
4614         }
4615
4616         if (req->key && req->key_len) {
4617                 auth_data->key_len = req->key_len;
4618                 auth_data->key_idx = req->key_idx;
4619                 memcpy(auth_data->key, req->key, req->key_len);
4620         }
4621
4622         auth_data->algorithm = auth_alg;
4623
4624         /* try to authenticate/probe */
4625
4626         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4627             ifmgd->assoc_data) {
4628                 err = -EBUSY;
4629                 goto err_free;
4630         }
4631
4632         if (ifmgd->auth_data)
4633                 ieee80211_destroy_auth_data(sdata, false);
4634
4635         /* prep auth_data so we don't go into idle on disassoc */
4636         ifmgd->auth_data = auth_data;
4637
4638         if (ifmgd->associated) {
4639                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4640
4641                 sdata_info(sdata,
4642                            "disconnect from AP %pM for new auth to %pM\n",
4643                            ifmgd->associated->bssid, req->bss->bssid);
4644                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4645                                        WLAN_REASON_UNSPECIFIED,
4646                                        false, frame_buf);
4647
4648                 ieee80211_report_disconnect(sdata, frame_buf,
4649                                             sizeof(frame_buf), true,
4650                                             WLAN_REASON_UNSPECIFIED);
4651         }
4652
4653         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4654
4655         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4656         if (err)
4657                 goto err_clear;
4658
4659         err = ieee80211_auth(sdata);
4660         if (err) {
4661                 sta_info_destroy_addr(sdata, req->bss->bssid);
4662                 goto err_clear;
4663         }
4664
4665         /* hold our own reference */
4666         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4667         return 0;
4668
4669  err_clear:
4670         eth_zero_addr(ifmgd->bssid);
4671         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4672         ifmgd->auth_data = NULL;
4673         mutex_lock(&sdata->local->mtx);
4674         ieee80211_vif_release_channel(sdata);
4675         mutex_unlock(&sdata->local->mtx);
4676  err_free:
4677         kfree(auth_data);
4678         return err;
4679 }
4680
4681 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4682                         struct cfg80211_assoc_request *req)
4683 {
4684         struct ieee80211_local *local = sdata->local;
4685         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4686         struct ieee80211_bss *bss = (void *)req->bss->priv;
4687         struct ieee80211_mgd_assoc_data *assoc_data;
4688         const struct cfg80211_bss_ies *beacon_ies;
4689         struct ieee80211_supported_band *sband;
4690         const u8 *ssidie, *ht_ie, *vht_ie;
4691         int i, err;
4692         bool override = false;
4693
4694         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4695         if (!assoc_data)
4696                 return -ENOMEM;
4697
4698         rcu_read_lock();
4699         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4700         if (!ssidie || ssidie[1] > sizeof(assoc_data->ssid)) {
4701                 rcu_read_unlock();
4702                 kfree(assoc_data);
4703                 return -EINVAL;
4704         }
4705         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4706         assoc_data->ssid_len = ssidie[1];
4707         rcu_read_unlock();
4708
4709         if (ifmgd->associated) {
4710                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4711
4712                 sdata_info(sdata,
4713                            "disconnect from AP %pM for new assoc to %pM\n",
4714                            ifmgd->associated->bssid, req->bss->bssid);
4715                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4716                                        WLAN_REASON_UNSPECIFIED,
4717                                        false, frame_buf);
4718
4719                 ieee80211_report_disconnect(sdata, frame_buf,
4720                                             sizeof(frame_buf), true,
4721                                             WLAN_REASON_UNSPECIFIED);
4722         }
4723
4724         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4725                 err = -EBUSY;
4726                 goto err_free;
4727         }
4728
4729         if (ifmgd->assoc_data) {
4730                 err = -EBUSY;
4731                 goto err_free;
4732         }
4733
4734         if (ifmgd->auth_data) {
4735                 bool match;
4736
4737                 /* keep sta info, bssid if matching */
4738                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4739                 ieee80211_destroy_auth_data(sdata, match);
4740         }
4741
4742         /* prepare assoc data */
4743
4744         ifmgd->beacon_crc_valid = false;
4745
4746         assoc_data->wmm = bss->wmm_used &&
4747                           (local->hw.queues >= IEEE80211_NUM_ACS);
4748
4749         /*
4750          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4751          * We still associate in non-HT mode (11a/b/g) if any one of these
4752          * ciphers is configured as pairwise.
4753          * We can set this to true for non-11n hardware, that'll be checked
4754          * separately along with the peer capabilities.
4755          */
4756         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4757                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4758                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4759                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4760                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4761                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4762                         netdev_info(sdata->dev,
4763                                     "disabling HT/VHT due to WEP/TKIP use\n");
4764                 }
4765         }
4766
4767         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4768         sband = local->hw.wiphy->bands[req->bss->channel->band];
4769         if (!sband->ht_cap.ht_supported ||
4770             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4771             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4772                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4773                 if (!bss->wmm_used &&
4774                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4775                         netdev_info(sdata->dev,
4776                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4777         }
4778
4779         /* disable VHT if we don't support it or the AP doesn't use WMM */
4780         if (!sband->vht_cap.vht_supported ||
4781             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4782             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4783                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4784                 if (!bss->wmm_used &&
4785                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4786                         netdev_info(sdata->dev,
4787                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4788         }
4789
4790         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4791         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4792                sizeof(ifmgd->ht_capa_mask));
4793
4794         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4795         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4796                sizeof(ifmgd->vht_capa_mask));
4797
4798         if (req->ie && req->ie_len) {
4799                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4800                 assoc_data->ie_len = req->ie_len;
4801         }
4802
4803         assoc_data->bss = req->bss;
4804
4805         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4806                 if (ifmgd->powersave)
4807                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4808                 else
4809                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4810         } else
4811                 sdata->smps_mode = ifmgd->req_smps;
4812
4813         assoc_data->capability = req->bss->capability;
4814         assoc_data->supp_rates = bss->supp_rates;
4815         assoc_data->supp_rates_len = bss->supp_rates_len;
4816
4817         rcu_read_lock();
4818         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4819         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4820                 assoc_data->ap_ht_param =
4821                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4822         else
4823                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4824         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4825         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4826                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4827                        sizeof(struct ieee80211_vht_cap));
4828         else
4829                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4830         rcu_read_unlock();
4831
4832         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4833                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4834              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4835                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4836
4837         if (bss->wmm_used && bss->uapsd_supported &&
4838             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4839                 assoc_data->uapsd = true;
4840                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4841         } else {
4842                 assoc_data->uapsd = false;
4843                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4844         }
4845
4846         if (req->prev_bssid)
4847                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4848
4849         if (req->use_mfp) {
4850                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4851                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4852         } else {
4853                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4854                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4855         }
4856
4857         if (req->flags & ASSOC_REQ_USE_RRM)
4858                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4859         else
4860                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4861
4862         if (req->crypto.control_port)
4863                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4864         else
4865                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4866
4867         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4868         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4869         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4870                                                         sdata->vif.type);
4871
4872         /* kick off associate process */
4873
4874         ifmgd->assoc_data = assoc_data;
4875         ifmgd->dtim_period = 0;
4876         ifmgd->have_beacon = false;
4877
4878         /* override HT/VHT configuration only if the AP and we support it */
4879         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4880                 struct ieee80211_sta_ht_cap sta_ht_cap;
4881
4882                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4883                         override = true;
4884
4885                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4886                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4887
4888                 /* check for 40 MHz disable override */
4889                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4890                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4891                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4892                         override = true;
4893
4894                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4895                     req->flags & ASSOC_REQ_DISABLE_VHT)
4896                         override = true;
4897         }
4898
4899         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4900                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4901                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4902         }
4903
4904         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4905                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4906
4907         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4908         if (err)
4909                 goto err_clear;
4910
4911         rcu_read_lock();
4912         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4913
4914         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4915             !beacon_ies) {
4916                 /*
4917                  * Wait up to one beacon interval ...
4918                  * should this be more if we miss one?
4919                  */
4920                 sdata_info(sdata, "waiting for beacon from %pM\n",
4921                            ifmgd->bssid);
4922                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4923                 assoc_data->timeout_started = true;
4924                 assoc_data->need_beacon = true;
4925         } else if (beacon_ies) {
4926                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4927                                                     beacon_ies->data,
4928                                                     beacon_ies->len);
4929                 u8 dtim_count = 0;
4930
4931                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4932                         const struct ieee80211_tim_ie *tim;
4933                         tim = (void *)(tim_ie + 2);
4934                         ifmgd->dtim_period = tim->dtim_period;
4935                         dtim_count = tim->dtim_count;
4936                 }
4937                 ifmgd->have_beacon = true;
4938                 assoc_data->timeout = jiffies;
4939                 assoc_data->timeout_started = true;
4940
4941                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4942                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4943                         sdata->vif.bss_conf.sync_device_ts =
4944                                 bss->device_ts_beacon;
4945                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4946                 }
4947         } else {
4948                 assoc_data->timeout = jiffies;
4949                 assoc_data->timeout_started = true;
4950         }
4951         rcu_read_unlock();
4952
4953         run_again(sdata, assoc_data->timeout);
4954
4955         if (bss->corrupt_data) {
4956                 char *corrupt_type = "data";
4957                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4958                         if (bss->corrupt_data &
4959                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4960                                 corrupt_type = "beacon and probe response";
4961                         else
4962                                 corrupt_type = "beacon";
4963                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4964                         corrupt_type = "probe response";
4965                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4966                            corrupt_type);
4967         }
4968
4969         return 0;
4970  err_clear:
4971         eth_zero_addr(ifmgd->bssid);
4972         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4973         ifmgd->assoc_data = NULL;
4974  err_free:
4975         kfree(assoc_data);
4976         return err;
4977 }
4978
4979 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4980                          struct cfg80211_deauth_request *req)
4981 {
4982         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4983         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4984         bool tx = !req->local_state_change;
4985
4986         if (ifmgd->auth_data &&
4987             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4988                 sdata_info(sdata,
4989                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4990                            req->bssid, req->reason_code,
4991                            ieee80211_get_reason_code_string(req->reason_code));
4992
4993                 drv_mgd_prepare_tx(sdata->local, sdata);
4994                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4995                                                IEEE80211_STYPE_DEAUTH,
4996                                                req->reason_code, tx,
4997                                                frame_buf);
4998                 ieee80211_destroy_auth_data(sdata, false);
4999                 ieee80211_report_disconnect(sdata, frame_buf,
5000                                             sizeof(frame_buf), true,
5001                                             req->reason_code);
5002
5003                 return 0;
5004         }
5005
5006         if (ifmgd->assoc_data &&
5007             ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
5008                 sdata_info(sdata,
5009                            "aborting association with %pM by local choice (Reason: %u=%s)\n",
5010                            req->bssid, req->reason_code,
5011                            ieee80211_get_reason_code_string(req->reason_code));
5012
5013                 drv_mgd_prepare_tx(sdata->local, sdata);
5014                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
5015                                                IEEE80211_STYPE_DEAUTH,
5016                                                req->reason_code, tx,
5017                                                frame_buf);
5018                 ieee80211_destroy_assoc_data(sdata, false, true);
5019                 ieee80211_report_disconnect(sdata, frame_buf,
5020                                             sizeof(frame_buf), true,
5021                                             req->reason_code);
5022                 return 0;
5023         }
5024
5025         if (ifmgd->associated &&
5026             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
5027                 sdata_info(sdata,
5028                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
5029                            req->bssid, req->reason_code,
5030                            ieee80211_get_reason_code_string(req->reason_code));
5031
5032                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
5033                                        req->reason_code, tx, frame_buf);
5034                 ieee80211_report_disconnect(sdata, frame_buf,
5035                                             sizeof(frame_buf), true,
5036                                             req->reason_code);
5037                 return 0;
5038         }
5039
5040         return -ENOTCONN;
5041 }
5042
5043 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5044                            struct cfg80211_disassoc_request *req)
5045 {
5046         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5047         u8 bssid[ETH_ALEN];
5048         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5049
5050         /*
5051          * cfg80211 should catch this ... but it's racy since
5052          * we can receive a disassoc frame, process it, hand it
5053          * to cfg80211 while that's in a locked section already
5054          * trying to tell us that the user wants to disconnect.
5055          */
5056         if (ifmgd->associated != req->bss)
5057                 return -ENOLINK;
5058
5059         sdata_info(sdata,
5060                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
5061                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5062
5063         memcpy(bssid, req->bss->bssid, ETH_ALEN);
5064         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5065                                req->reason_code, !req->local_state_change,
5066                                frame_buf);
5067
5068         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5069                                     req->reason_code);
5070
5071         return 0;
5072 }
5073
5074 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5075 {
5076         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5077
5078         /*
5079          * Make sure some work items will not run after this,
5080          * they will not do anything but might not have been
5081          * cancelled when disconnecting.
5082          */
5083         cancel_work_sync(&ifmgd->monitor_work);
5084         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5085         cancel_work_sync(&ifmgd->request_smps_work);
5086         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5087         cancel_work_sync(&ifmgd->chswitch_work);
5088         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5089
5090         sdata_lock(sdata);
5091         if (ifmgd->assoc_data) {
5092                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5093                 ieee80211_destroy_assoc_data(sdata, false, false);
5094                 cfg80211_assoc_timeout(sdata->dev, bss);
5095         }
5096         if (ifmgd->auth_data)
5097                 ieee80211_destroy_auth_data(sdata, false);
5098         spin_lock_bh(&ifmgd->teardown_lock);
5099         if (ifmgd->teardown_skb) {
5100                 kfree_skb(ifmgd->teardown_skb);
5101                 ifmgd->teardown_skb = NULL;
5102                 ifmgd->orig_teardown_skb = NULL;
5103         }
5104         spin_unlock_bh(&ifmgd->teardown_lock);
5105         del_timer_sync(&ifmgd->timer);
5106         sdata_unlock(sdata);
5107 }
5108
5109 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5110                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5111                                gfp_t gfp)
5112 {
5113         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5114
5115         trace_api_cqm_rssi_notify(sdata, rssi_event);
5116
5117         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5118 }
5119 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5120
5121 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5122 {
5123         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5124
5125         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5126
5127         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5128 }
5129 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);