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 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(!sdata->u.mgd.associated))
 126                 return;
 127
 128         ifmgd->probe_send_count = 0;
 129
 130         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
 131                 return;
 132
 133         mod_timer(&sdata->u.mgd.conn_mon_timer,
 134                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 135 }
 136
 137 static int ecw2cw(int ecw)
 138 {
 139         return (1 << ecw) - 1;
 140 }
 141
 142 static u32
 143 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 144                              struct ieee80211_supported_band *sband,
 145                              struct ieee80211_channel *channel,
 146                              const struct ieee80211_ht_cap *ht_cap,
 147                              const struct ieee80211_ht_operation *ht_oper,
 148                              const struct ieee80211_vht_operation *vht_oper,
 149                              struct cfg80211_chan_def *chandef, bool tracking)
 150 {
 151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 152         struct cfg80211_chan_def vht_chandef;
 153         struct ieee80211_sta_ht_cap sta_ht_cap;
 154         u32 ht_cfreq, ret;
 155
 156         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 157         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 158
 159         chandef->chan = channel;
 160         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 161         chandef->center_freq1 = channel->center_freq;
 162         chandef->center_freq2 = 0;
 163
 164         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 165                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 166                 goto out;
 167         }
 168
 169         chandef->width = NL80211_CHAN_WIDTH_20;
 170
 171         if (!(ht_cap->cap_info &
 172               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 173                 ret = IEEE80211_STA_DISABLE_40MHZ;
 174                 vht_chandef = *chandef;
 175                 goto out;
 176         }
 177
 178         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 179                                                   channel->band);
 180         /* check that channel matches the right operating channel */
 181         if (!tracking && channel->center_freq != ht_cfreq) {
 182                 /*
 183                  * It's possible that some APs are confused here;
 184                  * Netgear WNDR3700 sometimes reports 4 higher than
 185                  * the actual channel in association responses, but
 186                  * since we look at probe response/beacon data here
 187                  * it should be OK.
 188                  */
 189                 sdata_info(sdata,
 190                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 191                            channel->center_freq, ht_cfreq,
 192                            ht_oper->primary_chan, channel->band);
 193                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 194                 goto out;
 195         }
 196
 197         /* check 40 MHz support, if we have it */
 198         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 199                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 200                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 201                         chandef->width = NL80211_CHAN_WIDTH_40;
 202                         chandef->center_freq1 += 10;
 203                         break;
 204                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 205                         chandef->width = NL80211_CHAN_WIDTH_40;
 206                         chandef->center_freq1 -= 10;
 207                         break;
 208                 }
 209         } else {
 210                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 211                 ret = IEEE80211_STA_DISABLE_VHT;
 212                 /* also mark 40 MHz disabled */
 213                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 214                 goto out;
 215         }
 216
 217         if (!vht_oper || !sband->vht_cap.vht_supported) {
 218                 ret = IEEE80211_STA_DISABLE_VHT;
 219                 goto out;
 220         }
 221
 222         vht_chandef.chan = channel;
 223         vht_chandef.center_freq1 =
 224                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 225                                                channel->band);
 226         vht_chandef.center_freq2 = 0;
 227
 228         switch (vht_oper->chan_width) {
 229         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 230                 vht_chandef.width = chandef->width;
 231                 vht_chandef.center_freq1 = chandef->center_freq1;
 232                 break;
 233         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 234                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 235                 break;
 236         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 237                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 238                 break;
 239         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 240                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 241                 vht_chandef.center_freq2 =
 242                         ieee80211_channel_to_frequency(
 243                                 vht_oper->center_freq_seg2_idx,
 244                                 channel->band);
 245                 break;
 246         default:
 247                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 248                         sdata_info(sdata,
 249                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 250                                    vht_oper->chan_width);
 251                 ret = IEEE80211_STA_DISABLE_VHT;
 252                 goto out;
 253         }
 254
 255         if (!cfg80211_chandef_valid(&vht_chandef)) {
 256                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 257                         sdata_info(sdata,
 258                                    "AP VHT information is invalid, disable VHT\n");
 259                 ret = IEEE80211_STA_DISABLE_VHT;
 260                 goto out;
 261         }
 262
 263         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 264                 ret = 0;
 265                 goto out;
 266         }
 267
 268         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 269                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 270                         sdata_info(sdata,
 271                                    "AP VHT information doesn't match HT, disable VHT\n");
 272                 ret = IEEE80211_STA_DISABLE_VHT;
 273                 goto out;
 274         }
 275
 276         *chandef = vht_chandef;
 277
 278         ret = 0;
 279
 280 out:
 281         /*
 282          * When tracking the current AP, don't do any further checks if the
 283          * new chandef is identical to the one we're currently using for the
 284          * connection. This keeps us from playing ping-pong with regulatory,
 285          * without it the following can happen (for example):
 286          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 287          *  - AP advertises regdom US
 288          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 289          *  - the code below detects an unsupported channel, downgrades, and
 290          *    we disconnect from the AP in the caller
 291          *  - disconnect causes CRDA to reload world regdomain and the game
 292          *    starts anew.
 293          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 294          *
 295          * It seems possible that there are still scenarios with CSA or real
 296          * bandwidth changes where a this could happen, but those cases are
 297          * less common and wouldn't completely prevent using the AP.
 298          */
 299         if (tracking &&
 300             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 301                 return ret;
 302
 303         /* don't print the message below for VHT mismatch if VHT is disabled */
 304         if (ret & IEEE80211_STA_DISABLE_VHT)
 305                 vht_chandef = *chandef;
 306
 307         /*
 308          * Ignore the DISABLED flag when we're already connected and only
 309          * tracking the APs beacon for bandwidth changes - otherwise we
 310          * might get disconnected here if we connect to an AP, update our
 311          * regulatory information based on the AP's country IE and the
 312          * information we have is wrong/outdated and disables the channel
 313          * that we're actually using for the connection to the AP.
 314          */
 315         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 316                                         tracking ? 0 :
 317                                                    IEEE80211_CHAN_DISABLED)) {
 318                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 319                         ret = IEEE80211_STA_DISABLE_HT |
 320                               IEEE80211_STA_DISABLE_VHT;
 321                         break;
 322                 }
 323
 324                 ret |= ieee80211_chandef_downgrade(chandef);
 325         }
 326
 327         if (chandef->width != vht_chandef.width && !tracking)
 328                 sdata_info(sdata,
 329                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 330
 331         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 332         return ret;
 333 }
 334
 335 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 336                                struct sta_info *sta,
 337                                const struct ieee80211_ht_cap *ht_cap,
 338                                const struct ieee80211_ht_operation *ht_oper,
 339                                const struct ieee80211_vht_operation *vht_oper,
 340                                const u8 *bssid, u32 *changed)
 341 {
 342         struct ieee80211_local *local = sdata->local;
 343         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 344         struct ieee80211_supported_band *sband;
 345         struct ieee80211_channel *chan;
 346         struct cfg80211_chan_def chandef;
 347         u16 ht_opmode;
 348         u32 flags;
 349         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 350         int ret;
 351
 352         /* if HT was/is disabled, don't track any bandwidth changes */
 353         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 354                 return 0;
 355
 356         /* don't check VHT if we associated as non-VHT station */
 357         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 358                 vht_oper = NULL;
 359
 360         if (WARN_ON_ONCE(!sta))
 361                 return -EINVAL;
 362
 363         /*
 364          * if bss configuration changed store the new one -
 365          * this may be applicable even if channel is identical
 366          */
 367         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 368         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 369                 *changed |= BSS_CHANGED_HT;
 370                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 371         }
 372
 373         chan = sdata->vif.bss_conf.chandef.chan;
 374         sband = local->hw.wiphy->bands[chan->band];
 375
 376         /* calculate new channel (type) based on HT/VHT operation IEs */
 377         flags = ieee80211_determine_chantype(sdata, sband, chan,
 378                                              ht_cap, ht_oper, vht_oper,
 379                                              &chandef, true);
 380
 381         /*
 382          * Downgrade the new channel if we associated with restricted
 383          * capabilities. For example, if we associated as a 20 MHz STA
 384          * to a 40 MHz AP (due to regulatory, capabilities or config
 385          * reasons) then switching to a 40 MHz channel now won't do us
 386          * any good -- we couldn't use it with the AP.
 387          */
 388         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 389             chandef.width == NL80211_CHAN_WIDTH_80P80)
 390                 flags |= ieee80211_chandef_downgrade(&chandef);
 391         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 392             chandef.width == NL80211_CHAN_WIDTH_160)
 393                 flags |= ieee80211_chandef_downgrade(&chandef);
 394         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 395             chandef.width > NL80211_CHAN_WIDTH_20)
 396                 flags |= ieee80211_chandef_downgrade(&chandef);
 397
 398         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 399                 return 0;
 400
 401         sdata_info(sdata,
 402                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 403                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 404                    chandef.center_freq1, chandef.center_freq2);
 405
 406         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 407                                       IEEE80211_STA_DISABLE_VHT |
 408                                       IEEE80211_STA_DISABLE_40MHZ |
 409                                       IEEE80211_STA_DISABLE_80P80MHZ |
 410                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 411             !cfg80211_chandef_valid(&chandef)) {
 412                 sdata_info(sdata,
 413                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 414                            ifmgd->bssid);
 415                 return -EINVAL;
 416         }
 417
 418         switch (chandef.width) {
 419         case NL80211_CHAN_WIDTH_20_NOHT:
 420         case NL80211_CHAN_WIDTH_20:
 421                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 422                 break;
 423         case NL80211_CHAN_WIDTH_40:
 424                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 425                 break;
 426         case NL80211_CHAN_WIDTH_80:
 427                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 428                 break;
 429         case NL80211_CHAN_WIDTH_80P80:
 430         case NL80211_CHAN_WIDTH_160:
 431                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 432                 break;
 433         default:
 434                 return -EINVAL;
 435         }
 436
 437         if (new_sta_bw > sta->cur_max_bandwidth)
 438                 new_sta_bw = sta->cur_max_bandwidth;
 439
 440         if (new_sta_bw < sta->sta.bandwidth) {
 441                 sta->sta.bandwidth = new_sta_bw;
 442                 rate_control_rate_update(local, sband, sta,
 443                                          IEEE80211_RC_BW_CHANGED);
 444         }
 445
 446         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 447         if (ret) {
 448                 sdata_info(sdata,
 449                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 450                            ifmgd->bssid);
 451                 return ret;
 452         }
 453
 454         if (new_sta_bw > sta->sta.bandwidth) {
 455                 sta->sta.bandwidth = new_sta_bw;
 456                 rate_control_rate_update(local, sband, sta,
 457                                          IEEE80211_RC_BW_CHANGED);
 458         }
 459
 460         return 0;
 461 }
 462
 463 /* frame sending functions */
 464
 465 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 466                                 struct sk_buff *skb, u8 ap_ht_param,
 467                                 struct ieee80211_supported_band *sband,
 468                                 struct ieee80211_channel *channel,
 469                                 enum ieee80211_smps_mode smps)
 470 {
 471         u8 *pos;
 472         u32 flags = channel->flags;
 473         u16 cap;
 474         struct ieee80211_sta_ht_cap ht_cap;
 475
 476         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 477
 478         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 479         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 480
 481         /* determine capability flags */
 482         cap = ht_cap.cap;
 483
 484         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 485         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 486                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 487                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 488                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 489                 }
 490                 break;
 491         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 492                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 493                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 494                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 495                 }
 496                 break;
 497         }
 498
 499         /*
 500          * If 40 MHz was disabled associate as though we weren't
 501          * capable of 40 MHz -- some broken APs will never fall
 502          * back to trying to transmit in 20 MHz.
 503          */
 504         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 505                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 506                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 507         }
 508
 509         /* set SM PS mode properly */
 510         cap &= ~IEEE80211_HT_CAP_SM_PS;
 511         switch (smps) {
 512         case IEEE80211_SMPS_AUTOMATIC:
 513         case IEEE80211_SMPS_NUM_MODES:
 514                 WARN_ON(1);
 515         case IEEE80211_SMPS_OFF:
 516                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 517                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 518                 break;
 519         case IEEE80211_SMPS_STATIC:
 520                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 521                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 522                 break;
 523         case IEEE80211_SMPS_DYNAMIC:
 524                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 525                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 526                 break;
 527         }
 528
 529         /* reserve and fill IE */
 530         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 531         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 532 }
 533
 534 /* This function determines vht capability flags for the association
 535  * and builds the IE.
 536  * Note - the function may set the owner of the MU-MIMO capability
 537  */
 538 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 539                                  struct sk_buff *skb,
 540                                  struct ieee80211_supported_band *sband,
 541                                  struct ieee80211_vht_cap *ap_vht_cap)
 542 {
 543         struct ieee80211_local *local = sdata->local;
 544         u8 *pos;
 545         u32 cap;
 546         struct ieee80211_sta_vht_cap vht_cap;
 547         u32 mask, ap_bf_sts, our_bf_sts;
 548
 549         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 550
 551         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 552         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 553
 554         /* determine capability flags */
 555         cap = vht_cap.cap;
 556
 557         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 558                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 559
 560                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 561                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 562                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 563                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 564         }
 565
 566         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 567                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 568                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 569         }
 570
 571         /*
 572          * Some APs apparently get confused if our capabilities are better
 573          * than theirs, so restrict what we advertise in the assoc request.
 574          */
 575         if (!(ap_vht_cap->vht_cap_info &
 576                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 577                 cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 578                          IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
 579         else if (!(ap_vht_cap->vht_cap_info &
 580                         cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
 581                 cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 582
 583         /*
 584          * If some other vif is using the MU-MIMO capablity we cannot associate
 585          * using MU-MIMO - this will lead to contradictions in the group-id
 586          * mechanism.
 587          * Ownership is defined since association request, in order to avoid
 588          * simultaneous associations with MU-MIMO.
 589          */
 590         if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
 591                 bool disable_mu_mimo = false;
 592                 struct ieee80211_sub_if_data *other;
 593
 594                 list_for_each_entry_rcu(other, &local->interfaces, list) {
 595                         if (other->flags & IEEE80211_SDATA_MU_MIMO_OWNER) {
 596                                 disable_mu_mimo = true;
 597                                 break;
 598                         }
 599                 }
 600                 if (disable_mu_mimo)
 601                         cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
 602                 else
 603                         sdata->flags |= IEEE80211_SDATA_MU_MIMO_OWNER;
 604         }
 605
 606         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 607
 608         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 609         our_bf_sts = cap & mask;
 610
 611         if (ap_bf_sts < our_bf_sts) {
 612                 cap &= ~mask;
 613                 cap |= ap_bf_sts;
 614         }
 615
 616         /* reserve and fill IE */
 617         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 618         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 619 }
 620
 621 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 622 {
 623         struct ieee80211_local *local = sdata->local;
 624         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 625         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 626         struct sk_buff *skb;
 627         struct ieee80211_mgmt *mgmt;
 628         u8 *pos, qos_info;
 629         size_t offset = 0, noffset;
 630         int i, count, rates_len, supp_rates_len, shift;
 631         u16 capab;
 632         struct ieee80211_supported_band *sband;
 633         struct ieee80211_chanctx_conf *chanctx_conf;
 634         struct ieee80211_channel *chan;
 635         u32 rate_flags, rates = 0;
 636
 637         sdata_assert_lock(sdata);
 638
 639         rcu_read_lock();
 640         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 641         if (WARN_ON(!chanctx_conf)) {
 642                 rcu_read_unlock();
 643                 return;
 644         }
 645         chan = chanctx_conf->def.chan;
 646         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 647         rcu_read_unlock();
 648         sband = local->hw.wiphy->bands[chan->band];
 649         shift = ieee80211_vif_get_shift(&sdata->vif);
 650
 651         if (assoc_data->supp_rates_len) {
 652                 /*
 653                  * Get all rates supported by the device and the AP as
 654                  * some APs don't like getting a superset of their rates
 655                  * in the association request (e.g. D-Link DAP 1353 in
 656                  * b-only mode)...
 657                  */
 658                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 659                                                      assoc_data->supp_rates,
 660                                                      assoc_data->supp_rates_len,
 661                                                      &rates);
 662         } else {
 663                 /*
 664                  * In case AP not provide any supported rates information
 665                  * before association, we send information element(s) with
 666                  * all rates that we support.
 667                  */
 668                 rates_len = 0;
 669                 for (i = 0; i < sband->n_bitrates; i++) {
 670                         if ((rate_flags & sband->bitrates[i].flags)
 671                             != rate_flags)
 672                                 continue;
 673                         rates |= BIT(i);
 674                         rates_len++;
 675                 }
 676         }
 677
 678         skb = alloc_skb(local->hw.extra_tx_headroom +
 679                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 680                         2 + assoc_data->ssid_len + /* SSID */
 681                         4 + rates_len + /* (extended) rates */
 682                         4 + /* power capability */
 683                         2 + 2 * sband->n_channels + /* supported channels */
 684                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 685                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 686                         assoc_data->ie_len + /* extra IEs */
 687                         9, /* WMM */
 688                         GFP_KERNEL);
 689         if (!skb)
 690                 return;
 691
 692         skb_reserve(skb, local->hw.extra_tx_headroom);
 693
 694         capab = WLAN_CAPABILITY_ESS;
 695
 696         if (sband->band == NL80211_BAND_2GHZ) {
 697                 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 698                 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 699         }
 700
 701         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 702                 capab |= WLAN_CAPABILITY_PRIVACY;
 703
 704         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 705             ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
 706                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 707
 708         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 709                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 710
 711         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 712         memset(mgmt, 0, 24);
 713         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 714         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 715         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 716
 717         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 718                 skb_put(skb, 10);
 719                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 720                                                   IEEE80211_STYPE_REASSOC_REQ);
 721                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 722                 mgmt->u.reassoc_req.listen_interval =
 723                                 cpu_to_le16(local->hw.conf.listen_interval);
 724                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 725                        ETH_ALEN);
 726         } else {
 727                 skb_put(skb, 4);
 728                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 729                                                   IEEE80211_STYPE_ASSOC_REQ);
 730                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 731                 mgmt->u.assoc_req.listen_interval =
 732                                 cpu_to_le16(local->hw.conf.listen_interval);
 733         }
 734
 735         /* SSID */
 736         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 737         *pos++ = WLAN_EID_SSID;
 738         *pos++ = assoc_data->ssid_len;
 739         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 740
 741         /* add all rates which were marked to be used above */
 742         supp_rates_len = rates_len;
 743         if (supp_rates_len > 8)
 744                 supp_rates_len = 8;
 745
 746         pos = skb_put(skb, supp_rates_len + 2);
 747         *pos++ = WLAN_EID_SUPP_RATES;
 748         *pos++ = supp_rates_len;
 749
 750         count = 0;
 751         for (i = 0; i < sband->n_bitrates; i++) {
 752                 if (BIT(i) & rates) {
 753                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 754                                                 5 * (1 << shift));
 755                         *pos++ = (u8) rate;
 756                         if (++count == 8)
 757                                 break;
 758                 }
 759         }
 760
 761         if (rates_len > count) {
 762                 pos = skb_put(skb, rates_len - count + 2);
 763                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 764                 *pos++ = rates_len - count;
 765
 766                 for (i++; i < sband->n_bitrates; i++) {
 767                         if (BIT(i) & rates) {
 768                                 int rate;
 769                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 770                                                     5 * (1 << shift));
 771                                 *pos++ = (u8) rate;
 772                         }
 773                 }
 774         }
 775
 776         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 777             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 778                 pos = skb_put(skb, 4);
 779                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 780                 *pos++ = 2;
 781                 *pos++ = 0; /* min tx power */
 782                  /* max tx power */
 783                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 784         }
 785
 786         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 787                 /* TODO: get this in reg domain format */
 788                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 789                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 790                 *pos++ = 2 * sband->n_channels;
 791                 for (i = 0; i < sband->n_channels; i++) {
 792                         *pos++ = ieee80211_frequency_to_channel(
 793                                         sband->channels[i].center_freq);
 794                         *pos++ = 1; /* one channel in the subband*/
 795                 }
 796         }
 797
 798         /* if present, add any custom IEs that go before HT */
 799         if (assoc_data->ie_len) {
 800                 static const u8 before_ht[] = {
 801                         WLAN_EID_SSID,
 802                         WLAN_EID_SUPP_RATES,
 803                         WLAN_EID_EXT_SUPP_RATES,
 804                         WLAN_EID_PWR_CAPABILITY,
 805                         WLAN_EID_SUPPORTED_CHANNELS,
 806                         WLAN_EID_RSN,
 807                         WLAN_EID_QOS_CAPA,
 808                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 809                         WLAN_EID_MOBILITY_DOMAIN,
 810                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 811                         WLAN_EID_RIC_DATA,              /* reassoc only */
 812                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 813                 };
 814                 static const u8 after_ric[] = {
 815                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 816                         WLAN_EID_HT_CAPABILITY,
 817                         WLAN_EID_BSS_COEX_2040,
 818                         WLAN_EID_EXT_CAPABILITY,
 819                         WLAN_EID_QOS_TRAFFIC_CAPA,
 820                         WLAN_EID_TIM_BCAST_REQ,
 821                         WLAN_EID_INTERWORKING,
 822                         /* 60GHz doesn't happen right now */
 823                         WLAN_EID_VHT_CAPABILITY,
 824                         WLAN_EID_OPMODE_NOTIF,
 825                 };
 826
 827                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 828                                                  assoc_data->ie_len,
 829                                                  before_ht,
 830                                                  ARRAY_SIZE(before_ht),
 831                                                  after_ric,
 832                                                  ARRAY_SIZE(after_ric),
 833                                                  offset);
 834                 pos = skb_put(skb, noffset - offset);
 835                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 836                 offset = noffset;
 837         }
 838
 839         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 840                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 841                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 842
 843         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 844                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 845                                     sband, chan, sdata->smps_mode);
 846
 847         /* if present, add any custom IEs that go before VHT */
 848         if (assoc_data->ie_len) {
 849                 static const u8 before_vht[] = {
 850                         WLAN_EID_SSID,
 851                         WLAN_EID_SUPP_RATES,
 852                         WLAN_EID_EXT_SUPP_RATES,
 853                         WLAN_EID_PWR_CAPABILITY,
 854                         WLAN_EID_SUPPORTED_CHANNELS,
 855                         WLAN_EID_RSN,
 856                         WLAN_EID_QOS_CAPA,
 857                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 858                         WLAN_EID_MOBILITY_DOMAIN,
 859                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 860                         WLAN_EID_HT_CAPABILITY,
 861                         WLAN_EID_BSS_COEX_2040,
 862                         WLAN_EID_EXT_CAPABILITY,
 863                         WLAN_EID_QOS_TRAFFIC_CAPA,
 864                         WLAN_EID_TIM_BCAST_REQ,
 865                         WLAN_EID_INTERWORKING,
 866                 };
 867
 868                 /* RIC already taken above, so no need to handle here anymore */
 869                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 870                                              before_vht, ARRAY_SIZE(before_vht),
 871                                              offset);
 872                 pos = skb_put(skb, noffset - offset);
 873                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 874                 offset = noffset;
 875         }
 876
 877         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 878                 ieee80211_add_vht_ie(sdata, skb, sband,
 879                                      &assoc_data->ap_vht_cap);
 880
 881         /* if present, add any custom non-vendor IEs that go after HT */
 882         if (assoc_data->ie_len) {
 883                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 884                                                     assoc_data->ie_len,
 885                                                     offset);
 886                 pos = skb_put(skb, noffset - offset);
 887                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 888                 offset = noffset;
 889         }
 890
 891         if (assoc_data->wmm) {
 892                 if (assoc_data->uapsd) {
 893                         qos_info = ifmgd->uapsd_queues;
 894                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 895                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 896                 } else {
 897                         qos_info = 0;
 898                 }
 899
 900                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 901         }
 902
 903         /* add any remaining custom (i.e. vendor specific here) IEs */
 904         if (assoc_data->ie_len) {
 905                 noffset = assoc_data->ie_len;
 906                 pos = skb_put(skb, noffset - offset);
 907                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 908         }
 909
 910         drv_mgd_prepare_tx(local, sdata);
 911
 912         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 913         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 914                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 915                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 916         ieee80211_tx_skb(sdata, skb);
 917 }
 918
 919 void ieee80211_send_pspoll(struct ieee80211_local *local,
 920                            struct ieee80211_sub_if_data *sdata)
 921 {
 922         struct ieee80211_pspoll *pspoll;
 923         struct sk_buff *skb;
 924
 925         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 926         if (!skb)
 927                 return;
 928
 929         pspoll = (struct ieee80211_pspoll *) skb->data;
 930         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 931
 932         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 933         ieee80211_tx_skb(sdata, skb);
 934 }
 935
 936 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 937                              struct ieee80211_sub_if_data *sdata,
 938                              bool powersave)
 939 {
 940         struct sk_buff *skb;
 941         struct ieee80211_hdr_3addr *nullfunc;
 942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 943
 944         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 945         if (!skb)
 946                 return;
 947
 948         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 949         if (powersave)
 950                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 951
 952         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 953                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 954
 955         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 956                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 957
 958         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 959                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 960
 961         ieee80211_tx_skb(sdata, skb);
 962 }
 963
 964 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 965                                           struct ieee80211_sub_if_data *sdata)
 966 {
 967         struct sk_buff *skb;
 968         struct ieee80211_hdr *nullfunc;
 969         __le16 fc;
 970
 971         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 972                 return;
 973
 974         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 975         if (!skb)
 976                 return;
 977
 978         skb_reserve(skb, local->hw.extra_tx_headroom);
 979
 980         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 981         memset(nullfunc, 0, 30);
 982         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 983                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 984         nullfunc->frame_control = fc;
 985         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 986         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 987         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 988         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 989
 990         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 991         ieee80211_tx_skb(sdata, skb);
 992 }
 993
 994 /* spectrum management related things */
 995 static void ieee80211_chswitch_work(struct work_struct *work)
 996 {
 997         struct ieee80211_sub_if_data *sdata =
 998                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 999         struct ieee80211_local *local = sdata->local;
1000         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1001         int ret;
1002
1003         if (!ieee80211_sdata_running(sdata))
1004                 return;
1005
1006         sdata_lock(sdata);
1007         mutex_lock(&local->mtx);
1008         mutex_lock(&local->chanctx_mtx);
1009
1010         if (!ifmgd->associated)
1011                 goto out;
1012
1013         if (!sdata->vif.csa_active)
1014                 goto out;
1015
1016         /*
1017          * using reservation isn't immediate as it may be deferred until later
1018          * with multi-vif. once reservation is complete it will re-schedule the
1019          * work with no reserved_chanctx so verify chandef to check if it
1020          * completed successfully
1021          */
1022
1023         if (sdata->reserved_chanctx) {
1024                 struct ieee80211_supported_band *sband = NULL;
1025                 struct sta_info *mgd_sta = NULL;
1026                 enum ieee80211_sta_rx_bandwidth bw = IEEE80211_STA_RX_BW_20;
1027
1028                 /*
1029                  * with multi-vif csa driver may call ieee80211_csa_finish()
1030                  * many times while waiting for other interfaces to use their
1031                  * reservations
1032                  */
1033                 if (sdata->reserved_ready)
1034                         goto out;
1035
1036                 if (sdata->vif.bss_conf.chandef.width !=
1037                     sdata->csa_chandef.width) {
1038                         /*
1039                          * For managed interface, we need to also update the AP
1040                          * station bandwidth and align the rate scale algorithm
1041                          * on the bandwidth change. Here we only consider the
1042                          * bandwidth of the new channel definition (as channel
1043                          * switch flow does not have the full HT/VHT/HE
1044                          * information), assuming that if additional changes are
1045                          * required they would be done as part of the processing
1046                          * of the next beacon from the AP.
1047                          */
1048                         switch (sdata->csa_chandef.width) {
1049                         case NL80211_CHAN_WIDTH_20_NOHT:
1050                         case NL80211_CHAN_WIDTH_20:
1051                         default:
1052                                 bw = IEEE80211_STA_RX_BW_20;
1053                                 break;
1054                         case NL80211_CHAN_WIDTH_40:
1055                                 bw = IEEE80211_STA_RX_BW_40;
1056                                 break;
1057                         case NL80211_CHAN_WIDTH_80:
1058                                 bw = IEEE80211_STA_RX_BW_80;
1059                                 break;
1060                         case NL80211_CHAN_WIDTH_80P80:
1061                         case NL80211_CHAN_WIDTH_160:
1062                                 bw = IEEE80211_STA_RX_BW_160;
1063                                 break;
1064                         }
1065
1066                         mgd_sta = sta_info_get(sdata, ifmgd->bssid);
1067                         sband =
1068                                 local->hw.wiphy->bands[sdata->csa_chandef.chan->band];
1069                 }
1070
1071                 if (sdata->vif.bss_conf.chandef.width >
1072                     sdata->csa_chandef.width) {
1073                         mgd_sta->sta.bandwidth = bw;
1074                         rate_control_rate_update(local, sband, mgd_sta,
1075                                                  IEEE80211_RC_BW_CHANGED);
1076                 }
1077
1078                 ret = ieee80211_vif_use_reserved_context(sdata);
1079                 if (ret) {
1080                         sdata_info(sdata,
1081                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1082                                    ret);
1083                         ieee80211_queue_work(&sdata->local->hw,
1084                                              &ifmgd->csa_connection_drop_work);
1085                         goto out;
1086                 }
1087
1088                 if (sdata->vif.bss_conf.chandef.width <
1089                     sdata->csa_chandef.width) {
1090                         mgd_sta->sta.bandwidth = bw;
1091                         rate_control_rate_update(local, sband, mgd_sta,
1092                                                  IEEE80211_RC_BW_CHANGED);
1093                 }
1094
1095                 goto out;
1096         }
1097
1098         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1099                                         &sdata->csa_chandef)) {
1100                 sdata_info(sdata,
1101                            "failed to finalize channel switch, disconnecting\n");
1102                 ieee80211_queue_work(&sdata->local->hw,
1103                                      &ifmgd->csa_connection_drop_work);
1104                 goto out;
1105         }
1106
1107         ifmgd->csa_waiting_bcn = true;
1108
1109         ieee80211_sta_reset_beacon_monitor(sdata);
1110         ieee80211_sta_reset_conn_monitor(sdata);
1111
1112 out:
1113         mutex_unlock(&local->chanctx_mtx);
1114         mutex_unlock(&local->mtx);
1115         sdata_unlock(sdata);
1116 }
1117
1118 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1119 {
1120         struct ieee80211_local *local = sdata->local;
1121         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1122         int ret;
1123
1124         sdata_assert_lock(sdata);
1125
1126         WARN_ON(!sdata->vif.csa_active);
1127
1128         if (sdata->csa_block_tx) {
1129                 ieee80211_wake_vif_queues(local, sdata,
1130                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1131                 sdata->csa_block_tx = false;
1132         }
1133
1134         sdata->vif.csa_active = false;
1135         ifmgd->csa_waiting_bcn = false;
1136
1137         ret = drv_post_channel_switch(sdata);
1138         if (ret) {
1139                 sdata_info(sdata,
1140                            "driver post channel switch failed, disconnecting\n");
1141                 ieee80211_queue_work(&local->hw,
1142                                      &ifmgd->csa_connection_drop_work);
1143                 return;
1144         }
1145
1146         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1147 }
1148
1149 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1150 {
1151         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1152         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1153
1154         trace_api_chswitch_done(sdata, success);
1155         if (!success) {
1156                 sdata_info(sdata,
1157                            "driver channel switch failed, disconnecting\n");
1158                 ieee80211_queue_work(&sdata->local->hw,
1159                                      &ifmgd->csa_connection_drop_work);
1160         } else {
1161                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1162         }
1163 }
1164 EXPORT_SYMBOL(ieee80211_chswitch_done);
1165
1166 static void ieee80211_chswitch_timer(unsigned long data)
1167 {
1168         struct ieee80211_sub_if_data *sdata =
1169                 (struct ieee80211_sub_if_data *) data;
1170
1171         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1172 }
1173
1174 static void
1175 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1176                                  u64 timestamp, u32 device_timestamp,
1177                                  struct ieee802_11_elems *elems,
1178                                  bool beacon)
1179 {
1180         struct ieee80211_local *local = sdata->local;
1181         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1182         struct cfg80211_bss *cbss = ifmgd->associated;
1183         struct ieee80211_chanctx_conf *conf;
1184         struct ieee80211_chanctx *chanctx;
1185         enum nl80211_band current_band;
1186         struct ieee80211_csa_ie csa_ie;
1187         struct ieee80211_channel_switch ch_switch;
1188         int res;
1189
1190         sdata_assert_lock(sdata);
1191
1192         if (!cbss)
1193                 return;
1194
1195         if (local->scanning)
1196                 return;
1197
1198         /* disregard subsequent announcements if we are already processing */
1199         if (sdata->vif.csa_active)
1200                 return;
1201
1202         current_band = cbss->channel->band;
1203         memset(&csa_ie, 0, sizeof(csa_ie));
1204         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1205                                            ifmgd->flags,
1206                                            ifmgd->associated->bssid, &csa_ie);
1207         if (res < 0)
1208                 ieee80211_queue_work(&local->hw,
1209                                      &ifmgd->csa_connection_drop_work);
1210         if (res)
1211                 return;
1212
1213         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1214                                      IEEE80211_CHAN_DISABLED)) {
1215                 sdata_info(sdata,
1216                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1217                            ifmgd->associated->bssid,
1218                            csa_ie.chandef.chan->center_freq,
1219                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1220                            csa_ie.chandef.center_freq2);
1221                 ieee80211_queue_work(&local->hw,
1222                                      &ifmgd->csa_connection_drop_work);
1223                 return;
1224         }
1225
1226         if (cfg80211_chandef_identical(&csa_ie.chandef,
1227                                        &sdata->vif.bss_conf.chandef)) {
1228                 if (ifmgd->csa_ignored_same_chan)
1229                         return;
1230                 sdata_info(sdata,
1231                            "AP %pM tries to chanswitch to same channel, ignore\n",
1232                            ifmgd->associated->bssid);
1233                 ifmgd->csa_ignored_same_chan = true;
1234                 return;
1235         }
1236
1237         /*
1238          * Drop all TDLS peers - either we disconnect or move to a different
1239          * channel from this point on. There's no telling what our peer will do.
1240          * The TDLS WIDER_BW scenario is also problematic, as peers might now
1241          * have an incompatible wider chandef.
1242          */
1243         ieee80211_teardown_tdls_peers(sdata);
1244
1245         mutex_lock(&local->mtx);
1246         mutex_lock(&local->chanctx_mtx);
1247         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1248                                          lockdep_is_held(&local->chanctx_mtx));
1249         if (!conf) {
1250                 sdata_info(sdata,
1251                            "no channel context assigned to vif?, disconnecting\n");
1252                 goto drop_connection;
1253         }
1254
1255         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1256
1257         if (local->use_chanctx &&
1258             !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1259                 sdata_info(sdata,
1260                            "driver doesn't support chan-switch with channel contexts\n");
1261                 goto drop_connection;
1262         }
1263
1264         ch_switch.timestamp = timestamp;
1265         ch_switch.device_timestamp = device_timestamp;
1266         ch_switch.block_tx = csa_ie.mode;
1267         ch_switch.chandef = csa_ie.chandef;
1268         ch_switch.count = csa_ie.count;
1269
1270         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1271                 sdata_info(sdata,
1272                            "preparing for channel switch failed, disconnecting\n");
1273                 goto drop_connection;
1274         }
1275
1276         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1277                                             chanctx->mode, false);
1278         if (res) {
1279                 sdata_info(sdata,
1280                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1281                            res);
1282                 goto drop_connection;
1283         }
1284         mutex_unlock(&local->chanctx_mtx);
1285
1286         sdata->vif.csa_active = true;
1287         sdata->csa_chandef = csa_ie.chandef;
1288         sdata->csa_block_tx = csa_ie.mode;
1289         ifmgd->csa_ignored_same_chan = false;
1290
1291         if (sdata->csa_block_tx)
1292                 ieee80211_stop_vif_queues(local, sdata,
1293                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1294         mutex_unlock(&local->mtx);
1295
1296         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1297                                           csa_ie.count);
1298
1299         if (local->ops->channel_switch) {
1300                 /* use driver's channel switch callback */
1301                 drv_channel_switch(local, sdata, &ch_switch);
1302                 return;
1303         }
1304
1305         /* channel switch handled in software */
1306         if (csa_ie.count <= 1)
1307                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1308         else
1309                 mod_timer(&ifmgd->chswitch_timer,
1310                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1311                                          cbss->beacon_interval));
1312         return;
1313  drop_connection:
1314         ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
1315         mutex_unlock(&local->chanctx_mtx);
1316         mutex_unlock(&local->mtx);
1317 }
1318
1319 static bool
1320 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1321                                  struct ieee80211_channel *channel,
1322                                  const u8 *country_ie, u8 country_ie_len,
1323                                  const u8 *pwr_constr_elem,
1324                                  int *chan_pwr, int *pwr_reduction)
1325 {
1326         struct ieee80211_country_ie_triplet *triplet;
1327         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1328         int i, chan_increment;
1329         bool have_chan_pwr = false;
1330
1331         /* Invalid IE */
1332         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1333                 return false;
1334
1335         triplet = (void *)(country_ie + 3);
1336         country_ie_len -= 3;
1337
1338         switch (channel->band) {
1339         default:
1340                 WARN_ON_ONCE(1);
1341                 /* fall through */
1342         case NL80211_BAND_2GHZ:
1343         case IEEE80211_BAND_60GHZ:
1344                 chan_increment = 1;
1345                 break;
1346         case NL80211_BAND_5GHZ:
1347                 chan_increment = 4;
1348                 break;
1349         }
1350
1351         /* find channel */
1352         while (country_ie_len >= 3) {
1353                 u8 first_channel = triplet->chans.first_channel;
1354
1355                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1356                         goto next;
1357
1358                 for (i = 0; i < triplet->chans.num_channels; i++) {
1359                         if (first_channel + i * chan_increment == chan) {
1360                                 have_chan_pwr = true;
1361                                 *chan_pwr = triplet->chans.max_power;
1362                                 break;
1363                         }
1364                 }
1365                 if (have_chan_pwr)
1366                         break;
1367
1368  next:
1369                 triplet++;
1370                 country_ie_len -= 3;
1371         }
1372
1373         if (have_chan_pwr && pwr_constr_elem)
1374                 *pwr_reduction = *pwr_constr_elem;
1375         else
1376                 *pwr_reduction = 0;
1377
1378         return have_chan_pwr;
1379 }
1380
1381 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1382                                       struct ieee80211_channel *channel,
1383                                       const u8 *cisco_dtpc_ie,
1384                                       int *pwr_level)
1385 {
1386         /* From practical testing, the first data byte of the DTPC element
1387          * seems to contain the requested dBm level, and the CLI on Cisco
1388          * APs clearly state the range is -127 to 127 dBm, which indicates
1389          * a signed byte, although it seemingly never actually goes negative.
1390          * The other byte seems to always be zero.
1391          */
1392         *pwr_level = (__s8)cisco_dtpc_ie[4];
1393 }
1394
1395 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1396                                        struct ieee80211_channel *channel,
1397                                        struct ieee80211_mgmt *mgmt,
1398                                        const u8 *country_ie, u8 country_ie_len,
1399                                        const u8 *pwr_constr_ie,
1400                                        const u8 *cisco_dtpc_ie)
1401 {
1402         bool has_80211h_pwr = false, has_cisco_pwr = false;
1403         int chan_pwr = 0, pwr_reduction_80211h = 0;
1404         int pwr_level_cisco, pwr_level_80211h;
1405         int new_ap_level;
1406         __le16 capab = mgmt->u.probe_resp.capab_info;
1407
1408         if (country_ie &&
1409             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1410              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1411                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1412                         sdata, channel, country_ie, country_ie_len,
1413                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1414                 pwr_level_80211h =
1415                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1416         }
1417
1418         if (cisco_dtpc_ie) {
1419                 ieee80211_find_cisco_dtpc(
1420                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1421                 has_cisco_pwr = true;
1422         }
1423
1424         if (!has_80211h_pwr && !has_cisco_pwr)
1425                 return 0;
1426
1427         /* If we have both 802.11h and Cisco DTPC, apply both limits
1428          * by picking the smallest of the two power levels advertised.
1429          */
1430         if (has_80211h_pwr &&
1431             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1432                 new_ap_level = pwr_level_80211h;
1433
1434                 if (sdata->ap_power_level == new_ap_level)
1435                         return 0;
1436
1437                 sdata_dbg(sdata,
1438                           "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1439                           pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1440                           sdata->u.mgd.bssid);
1441         } else {  /* has_cisco_pwr is always true here. */
1442                 new_ap_level = pwr_level_cisco;
1443
1444                 if (sdata->ap_power_level == new_ap_level)
1445                         return 0;
1446
1447                 sdata_dbg(sdata,
1448                           "Limiting TX power to %d dBm as advertised by %pM\n",
1449                           pwr_level_cisco, sdata->u.mgd.bssid);
1450         }
1451
1452         sdata->ap_power_level = new_ap_level;
1453         if (__ieee80211_recalc_txpower(sdata))
1454                 return BSS_CHANGED_TXPOWER;
1455         return 0;
1456 }
1457
1458 /* powersave */
1459 static void ieee80211_enable_ps(struct ieee80211_local *local,
1460                                 struct ieee80211_sub_if_data *sdata)
1461 {
1462         struct ieee80211_conf *conf = &local->hw.conf;
1463
1464         /*
1465          * If we are scanning right now then the parameters will
1466          * take effect when scan finishes.
1467          */
1468         if (local->scanning)
1469                 return;
1470
1471         if (conf->dynamic_ps_timeout > 0 &&
1472             !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1473                 mod_timer(&local->dynamic_ps_timer, jiffies +
1474                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1475         } else {
1476                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1477                         ieee80211_send_nullfunc(local, sdata, true);
1478
1479                 if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1480                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1481                         return;
1482
1483                 conf->flags |= IEEE80211_CONF_PS;
1484                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1485         }
1486 }
1487
1488 static void ieee80211_change_ps(struct ieee80211_local *local)
1489 {
1490         struct ieee80211_conf *conf = &local->hw.conf;
1491
1492         if (local->ps_sdata) {
1493                 ieee80211_enable_ps(local, local->ps_sdata);
1494         } else if (conf->flags & IEEE80211_CONF_PS) {
1495                 conf->flags &= ~IEEE80211_CONF_PS;
1496                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1497                 del_timer_sync(&local->dynamic_ps_timer);
1498                 cancel_work_sync(&local->dynamic_ps_enable_work);
1499         }
1500 }
1501
1502 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1503 {
1504         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1505         struct sta_info *sta = NULL;
1506         bool authorized = false;
1507
1508         if (!mgd->powersave)
1509                 return false;
1510
1511         if (mgd->broken_ap)
1512                 return false;
1513
1514         if (!mgd->associated)
1515                 return false;
1516
1517         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1518                 return false;
1519
1520         if (!mgd->have_beacon)
1521                 return false;
1522
1523         rcu_read_lock();
1524         sta = sta_info_get(sdata, mgd->bssid);
1525         if (sta)
1526                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1527         rcu_read_unlock();
1528
1529         return authorized;
1530 }
1531
1532 /* need to hold RTNL or interface lock */
1533 void ieee80211_recalc_ps(struct ieee80211_local *local)
1534 {
1535         struct ieee80211_sub_if_data *sdata, *found = NULL;
1536         int count = 0;
1537         int timeout;
1538
1539         if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1540                 local->ps_sdata = NULL;
1541                 return;
1542         }
1543
1544         list_for_each_entry(sdata, &local->interfaces, list) {
1545                 if (!ieee80211_sdata_running(sdata))
1546                         continue;
1547                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1548                         /* If an AP vif is found, then disable PS
1549                          * by setting the count to zero thereby setting
1550                          * ps_sdata to NULL.
1551                          */
1552                         count = 0;
1553                         break;
1554                 }
1555                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1556                         continue;
1557                 found = sdata;
1558                 count++;
1559         }
1560
1561         if (count == 1 && ieee80211_powersave_allowed(found)) {
1562                 u8 dtimper = found->u.mgd.dtim_period;
1563                 s32 beaconint_us;
1564
1565                 beaconint_us = ieee80211_tu_to_usec(
1566                                         found->vif.bss_conf.beacon_int);
1567
1568                 timeout = local->dynamic_ps_forced_timeout;
1569                 if (timeout < 0)
1570                         timeout = 100;
1571                 local->hw.conf.dynamic_ps_timeout = timeout;
1572
1573                 /* If the TIM IE is invalid, pretend the value is 1 */
1574                 if (!dtimper)
1575                         dtimper = 1;
1576
1577                 local->hw.conf.ps_dtim_period = dtimper;
1578                 local->ps_sdata = found;
1579         } else {
1580                 local->ps_sdata = NULL;
1581         }
1582
1583         ieee80211_change_ps(local);
1584 }
1585
1586 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1587 {
1588         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1589
1590         if (sdata->vif.bss_conf.ps != ps_allowed) {
1591                 sdata->vif.bss_conf.ps = ps_allowed;
1592                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1593         }
1594 }
1595
1596 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1597 {
1598         struct ieee80211_local *local =
1599                 container_of(work, struct ieee80211_local,
1600                              dynamic_ps_disable_work);
1601
1602         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1603                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1604                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1605         }
1606
1607         ieee80211_wake_queues_by_reason(&local->hw,
1608                                         IEEE80211_MAX_QUEUE_MAP,
1609                                         IEEE80211_QUEUE_STOP_REASON_PS,
1610                                         false);
1611 }
1612
1613 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1614 {
1615         struct ieee80211_local *local =
1616                 container_of(work, struct ieee80211_local,
1617                              dynamic_ps_enable_work);
1618         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1619         struct ieee80211_if_managed *ifmgd;
1620         unsigned long flags;
1621         int q;
1622
1623         /* can only happen when PS was just disabled anyway */
1624         if (!sdata)
1625                 return;
1626
1627         ifmgd = &sdata->u.mgd;
1628
1629         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1630                 return;
1631
1632         if (local->hw.conf.dynamic_ps_timeout > 0) {
1633                 /* don't enter PS if TX frames are pending */
1634                 if (drv_tx_frames_pending(local)) {
1635                         mod_timer(&local->dynamic_ps_timer, jiffies +
1636                                   msecs_to_jiffies(
1637                                   local->hw.conf.dynamic_ps_timeout));
1638                         return;
1639                 }
1640
1641                 /*
1642                  * transmission can be stopped by others which leads to
1643                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1644                  * is not the actual idle state.
1645                  */
1646                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1647                 for (q = 0; q < local->hw.queues; q++) {
1648                         if (local->queue_stop_reasons[q]) {
1649                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1650                                                        flags);
1651                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1652                                           msecs_to_jiffies(
1653                                           local->hw.conf.dynamic_ps_timeout));
1654                                 return;
1655                         }
1656                 }
1657                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1658         }
1659
1660         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1661             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1662                 if (drv_tx_frames_pending(local)) {
1663                         mod_timer(&local->dynamic_ps_timer, jiffies +
1664                                   msecs_to_jiffies(
1665                                   local->hw.conf.dynamic_ps_timeout));
1666                 } else {
1667                         ieee80211_send_nullfunc(local, sdata, true);
1668                         /* Flush to get the tx status of nullfunc frame */
1669                         ieee80211_flush_queues(local, sdata, false);
1670                 }
1671         }
1672
1673         if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1674               ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1675             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1676                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1677                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1678                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1679         }
1680 }
1681
1682 void ieee80211_dynamic_ps_timer(unsigned long data)
1683 {
1684         struct ieee80211_local *local = (void *) data;
1685
1686         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1687 }
1688
1689 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1690 {
1691         struct delayed_work *delayed_work =
1692                 container_of(work, struct delayed_work, work);
1693         struct ieee80211_sub_if_data *sdata =
1694                 container_of(delayed_work, struct ieee80211_sub_if_data,
1695                              dfs_cac_timer_work);
1696         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1697
1698         mutex_lock(&sdata->local->mtx);
1699         if (sdata->wdev.cac_started) {
1700                 ieee80211_vif_release_channel(sdata);
1701                 cfg80211_cac_event(sdata->dev, &chandef,
1702                                    NL80211_RADAR_CAC_FINISHED,
1703                                    GFP_KERNEL);
1704         }
1705         mutex_unlock(&sdata->local->mtx);
1706 }
1707
1708 static bool
1709 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1710 {
1711         struct ieee80211_local *local = sdata->local;
1712         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1713         bool ret = false;
1714         int ac;
1715
1716         if (local->hw.queues < IEEE80211_NUM_ACS)
1717                 return false;
1718
1719         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1720                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1721                 int non_acm_ac;
1722                 unsigned long now = jiffies;
1723
1724                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1725                     tx_tspec->admitted_time &&
1726                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1727                         tx_tspec->consumed_tx_time = 0;
1728                         tx_tspec->time_slice_start = now;
1729
1730                         if (tx_tspec->downgraded)
1731                                 tx_tspec->action =
1732                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1733                 }
1734
1735                 switch (tx_tspec->action) {
1736                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1737                         /* take the original parameters */
1738                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1739                                 sdata_err(sdata,
1740                                           "failed to set TX queue parameters for queue %d\n",
1741                                           ac);
1742                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1743                         tx_tspec->downgraded = false;
1744                         ret = true;
1745                         break;
1746                 case TX_TSPEC_ACTION_DOWNGRADE:
1747                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1748                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1749                                 ret = true;
1750                                 break;
1751                         }
1752                         /* downgrade next lower non-ACM AC */
1753                         for (non_acm_ac = ac + 1;
1754                              non_acm_ac < IEEE80211_NUM_ACS;
1755                              non_acm_ac++)
1756                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1757                                         break;
1758                         /* The loop will result in using BK even if it requires
1759                          * admission control, such configuration makes no sense
1760                          * and we have to transmit somehow - the AC selection
1761                          * does the same thing.
1762                          */
1763                         if (drv_conf_tx(local, sdata, ac,
1764                                         &sdata->tx_conf[non_acm_ac]))
1765                                 sdata_err(sdata,
1766                                           "failed to set TX queue parameters for queue %d\n",
1767                                           ac);
1768                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1769                         ret = true;
1770                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1771                                 tx_tspec->time_slice_start + HZ - now + 1);
1772                         break;
1773                 case TX_TSPEC_ACTION_NONE:
1774                         /* nothing now */
1775                         break;
1776                 }
1777         }
1778
1779         return ret;
1780 }
1781
1782 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1783 {
1784         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1785                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1786 }
1787
1788 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1789 {
1790         struct ieee80211_sub_if_data *sdata;
1791
1792         sdata = container_of(work, struct ieee80211_sub_if_data,
1793                              u.mgd.tx_tspec_wk.work);
1794         ieee80211_sta_handle_tspec_ac_params(sdata);
1795 }
1796
1797 /* MLME */
1798 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1799                                      struct ieee80211_sub_if_data *sdata,
1800                                      const u8 *wmm_param, size_t wmm_param_len)
1801 {
1802         struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1803         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1804         size_t left;
1805         int count, ac;
1806         const u8 *pos;
1807         u8 uapsd_queues = 0;
1808
1809         if (!local->ops->conf_tx)
1810                 return false;
1811
1812         if (local->hw.queues < IEEE80211_NUM_ACS)
1813                 return false;
1814
1815         if (!wmm_param)
1816                 return false;
1817
1818         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1819                 return false;
1820
1821         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1822                 uapsd_queues = ifmgd->uapsd_queues;
1823
1824         count = wmm_param[6] & 0x0f;
1825         if (count == ifmgd->wmm_last_param_set)
1826                 return false;
1827         ifmgd->wmm_last_param_set = count;
1828
1829         pos = wmm_param + 8;
1830         left = wmm_param_len - 8;
1831
1832         memset(&params, 0, sizeof(params));
1833
1834         sdata->wmm_acm = 0;
1835         for (; left >= 4; left -= 4, pos += 4) {
1836                 int aci = (pos[0] >> 5) & 0x03;
1837                 int acm = (pos[0] >> 4) & 0x01;
1838                 bool uapsd = false;
1839
1840                 switch (aci) {
1841                 case 1: /* AC_BK */
1842                         ac = IEEE80211_AC_BK;
1843                         if (acm)
1844                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1845                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1846                                 uapsd = true;
1847                         break;
1848                 case 2: /* AC_VI */
1849                         ac = IEEE80211_AC_VI;
1850                         if (acm)
1851                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1852                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1853                                 uapsd = true;
1854                         break;
1855                 case 3: /* AC_VO */
1856                         ac = IEEE80211_AC_VO;
1857                         if (acm)
1858                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1859                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1860                                 uapsd = true;
1861                         break;
1862                 case 0: /* AC_BE */
1863                 default:
1864                         ac = IEEE80211_AC_BE;
1865                         if (acm)
1866                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1867                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1868                                 uapsd = true;
1869                         break;
1870                 }
1871
1872                 params[ac].aifs = pos[0] & 0x0f;
1873
1874                 if (params[ac].aifs < 2) {
1875                         sdata_info(sdata,
1876                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1877                                    params[ac].aifs, aci);
1878                         params[ac].aifs = 2;
1879                 }
1880                 params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1881                 params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
1882                 params[ac].txop = get_unaligned_le16(pos + 2);
1883                 params[ac].acm = acm;
1884                 params[ac].uapsd = uapsd;
1885
1886                 if (params[ac].cw_min == 0 ||
1887                     params[ac].cw_min > params[ac].cw_max) {
1888                         sdata_info(sdata,
1889                                    "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
1890                                    params[ac].cw_min, params[ac].cw_max, aci);
1891                         return false;
1892                 }
1893         }
1894
1895         /* WMM specification requires all 4 ACIs. */
1896         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1897                 if (params[ac].cw_min == 0) {
1898                         sdata_info(sdata,
1899                                    "AP has invalid WMM params (missing AC %d), using defaults\n",
1900                                    ac);
1901                         return false;
1902                 }
1903         }
1904
1905         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1906                 mlme_dbg(sdata,
1907                          "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1908                          ac, params[ac].acm,
1909                          params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
1910                          params[ac].txop, params[ac].uapsd,
1911                          ifmgd->tx_tspec[ac].downgraded);
1912                 sdata->tx_conf[ac] = params[ac];
1913                 if (!ifmgd->tx_tspec[ac].downgraded &&
1914                     drv_conf_tx(local, sdata, ac, &params[ac]))
1915                         sdata_err(sdata,
1916                                   "failed to set TX queue parameters for AC %d\n",
1917                                   ac);
1918         }
1919
1920         /* enable WMM or activate new settings */
1921         sdata->vif.bss_conf.qos = true;
1922         return true;
1923 }
1924
1925 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1926 {
1927         lockdep_assert_held(&sdata->local->mtx);
1928
1929         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1930         ieee80211_run_deferred_scan(sdata->local);
1931 }
1932
1933 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1934 {
1935         mutex_lock(&sdata->local->mtx);
1936         __ieee80211_stop_poll(sdata);
1937         mutex_unlock(&sdata->local->mtx);
1938 }
1939
1940 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1941                                            u16 capab, bool erp_valid, u8 erp)
1942 {
1943         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1944         u32 changed = 0;
1945         bool use_protection;
1946         bool use_short_preamble;
1947         bool use_short_slot;
1948
1949         if (erp_valid) {
1950                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1951                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1952         } else {
1953                 use_protection = false;
1954                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1955         }
1956
1957         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1958         if (ieee80211_get_sdata_band(sdata) == NL80211_BAND_5GHZ)
1959                 use_short_slot = true;
1960
1961         if (use_protection != bss_conf->use_cts_prot) {
1962                 bss_conf->use_cts_prot = use_protection;
1963                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1964         }
1965
1966         if (use_short_preamble != bss_conf->use_short_preamble) {
1967                 bss_conf->use_short_preamble = use_short_preamble;
1968                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1969         }
1970
1971         if (use_short_slot != bss_conf->use_short_slot) {
1972                 bss_conf->use_short_slot = use_short_slot;
1973                 changed |= BSS_CHANGED_ERP_SLOT;
1974         }
1975
1976         return changed;
1977 }
1978
1979 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1980                                      struct cfg80211_bss *cbss,
1981                                      u32 bss_info_changed)
1982 {
1983         struct ieee80211_bss *bss = (void *)cbss->priv;
1984         struct ieee80211_local *local = sdata->local;
1985         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1986
1987         bss_info_changed |= BSS_CHANGED_ASSOC;
1988         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1989                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1990
1991         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1992                 beacon_loss_count * bss_conf->beacon_int));
1993
1994         sdata->u.mgd.associated = cbss;
1995         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1996
1997         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1998
1999         if (sdata->vif.p2p) {
2000                 const struct cfg80211_bss_ies *ies;
2001
2002                 rcu_read_lock();
2003                 ies = rcu_dereference(cbss->ies);
2004                 if (ies) {
2005                         int ret;
2006
2007                         ret = cfg80211_get_p2p_attr(
2008                                         ies->data, ies->len,
2009                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2010                                         (u8 *) &bss_conf->p2p_noa_attr,
2011                                         sizeof(bss_conf->p2p_noa_attr));
2012                         if (ret >= 2) {
2013                                 sdata->u.mgd.p2p_noa_index =
2014                                         bss_conf->p2p_noa_attr.index;
2015                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
2016                         }
2017                 }
2018                 rcu_read_unlock();
2019         }
2020
2021         /* just to be sure */
2022         ieee80211_stop_poll(sdata);
2023
2024         ieee80211_led_assoc(local, 1);
2025
2026         if (sdata->u.mgd.have_beacon) {
2027                 /*
2028                  * If the AP is buggy we may get here with no DTIM period
2029                  * known, so assume it's 1 which is the only safe assumption
2030                  * in that case, although if the TIM IE is broken powersave
2031                  * probably just won't work at all.
2032                  */
2033                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
2034                 bss_conf->beacon_rate = bss->beacon_rate;
2035                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
2036         } else {
2037                 bss_conf->beacon_rate = NULL;
2038                 bss_conf->dtim_period = 0;
2039         }
2040
2041         bss_conf->assoc = 1;
2042
2043         /* Tell the driver to monitor connection quality (if supported) */
2044         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
2045             bss_conf->cqm_rssi_thold)
2046                 bss_info_changed |= BSS_CHANGED_CQM;
2047
2048         /* Enable ARP filtering */
2049         if (bss_conf->arp_addr_cnt)
2050                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
2051
2052         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
2053
2054         mutex_lock(&local->iflist_mtx);
2055         ieee80211_recalc_ps(local);
2056         mutex_unlock(&local->iflist_mtx);
2057
2058         ieee80211_recalc_smps(sdata);
2059         ieee80211_recalc_ps_vif(sdata);
2060
2061         netif_carrier_on(sdata->dev);
2062 }
2063
2064 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
2065                                    u16 stype, u16 reason, bool tx,
2066                                    u8 *frame_buf)
2067 {
2068         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2069         struct ieee80211_local *local = sdata->local;
2070         u32 changed = 0;
2071
2072         sdata_assert_lock(sdata);
2073
2074         if (WARN_ON_ONCE(tx && !frame_buf))
2075                 return;
2076
2077         if (WARN_ON(!ifmgd->associated))
2078                 return;
2079
2080         ieee80211_stop_poll(sdata);
2081
2082         ifmgd->associated = NULL;
2083         netif_carrier_off(sdata->dev);
2084
2085         /*
2086          * if we want to get out of ps before disassoc (why?) we have
2087          * to do it before sending disassoc, as otherwise the null-packet
2088          * won't be valid.
2089          */
2090         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2091                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2092                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2093         }
2094         local->ps_sdata = NULL;
2095
2096         /* disable per-vif ps */
2097         ieee80211_recalc_ps_vif(sdata);
2098
2099         /* make sure ongoing transmission finishes */
2100         synchronize_net();
2101
2102         /*
2103          * drop any frame before deauth/disassoc, this can be data or
2104          * management frame. Since we are disconnecting, we should not
2105          * insist sending these frames which can take time and delay
2106          * the disconnection and possible the roaming.
2107          */
2108         if (tx)
2109                 ieee80211_flush_queues(local, sdata, true);
2110
2111         /* deauthenticate/disassociate now */
2112         if (tx || frame_buf)
2113                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2114                                                reason, tx, frame_buf);
2115
2116         /* flush out frame - make sure the deauth was actually sent */
2117         if (tx)
2118                 ieee80211_flush_queues(local, sdata, false);
2119
2120         /* clear bssid only after building the needed mgmt frames */
2121         eth_zero_addr(ifmgd->bssid);
2122
2123         /* remove AP and TDLS peers */
2124         sta_info_flush(sdata);
2125
2126         /* finally reset all BSS / config parameters */
2127         changed |= ieee80211_reset_erp_info(sdata);
2128
2129         ieee80211_led_assoc(local, 0);
2130         changed |= BSS_CHANGED_ASSOC;
2131         sdata->vif.bss_conf.assoc = false;
2132
2133         ifmgd->p2p_noa_index = -1;
2134         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2135                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2136
2137         /* on the next assoc, re-program HT/VHT parameters */
2138         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2139         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2140         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2141         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2142         sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2143
2144         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2145
2146         del_timer_sync(&local->dynamic_ps_timer);
2147         cancel_work_sync(&local->dynamic_ps_enable_work);
2148
2149         /* Disable ARP filtering */
2150         if (sdata->vif.bss_conf.arp_addr_cnt)
2151                 changed |= BSS_CHANGED_ARP_FILTER;
2152
2153         sdata->vif.bss_conf.qos = false;
2154         changed |= BSS_CHANGED_QOS;
2155
2156         /* The BSSID (not really interesting) and HT changed */
2157         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2158         ieee80211_bss_info_change_notify(sdata, changed);
2159
2160         /* disassociated - set to defaults now */
2161         ieee80211_set_wmm_default(sdata, false, false);
2162
2163         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2164         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2165         del_timer_sync(&sdata->u.mgd.timer);
2166         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2167
2168         sdata->vif.bss_conf.dtim_period = 0;
2169         sdata->vif.bss_conf.beacon_rate = NULL;
2170
2171         ifmgd->have_beacon = false;
2172
2173         ifmgd->flags = 0;
2174         mutex_lock(&local->mtx);
2175         ieee80211_vif_release_channel(sdata);
2176
2177         sdata->vif.csa_active = false;
2178         ifmgd->csa_waiting_bcn = false;
2179         ifmgd->csa_ignored_same_chan = false;
2180         if (sdata->csa_block_tx) {
2181                 ieee80211_wake_vif_queues(local, sdata,
2182                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2183                 sdata->csa_block_tx = false;
2184         }
2185         mutex_unlock(&local->mtx);
2186
2187         /* existing TX TSPEC sessions no longer exist */
2188         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2189         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2190
2191         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2192 }
2193
2194 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2195                              struct ieee80211_hdr *hdr)
2196 {
2197         /*
2198          * We can postpone the mgd.timer whenever receiving unicast frames
2199          * from AP because we know that the connection is working both ways
2200          * at that time. But multicast frames (and hence also beacons) must
2201          * be ignored here, because we need to trigger the timer during
2202          * data idle periods for sending the periodic probe request to the
2203          * AP we're connected to.
2204          */
2205         if (is_multicast_ether_addr(hdr->addr1))
2206                 return;
2207
2208         ieee80211_sta_reset_conn_monitor(sdata);
2209 }
2210
2211 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2212 {
2213         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2214         struct ieee80211_local *local = sdata->local;
2215
2216         mutex_lock(&local->mtx);
2217         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2218                 goto out;
2219
2220         __ieee80211_stop_poll(sdata);
2221
2222         mutex_lock(&local->iflist_mtx);
2223         ieee80211_recalc_ps(local);
2224         mutex_unlock(&local->iflist_mtx);
2225
2226         if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2227                 goto out;
2228
2229         /*
2230          * We've received a probe response, but are not sure whether
2231          * we have or will be receiving any beacons or data, so let's
2232          * schedule the timers again, just in case.
2233          */
2234         ieee80211_sta_reset_beacon_monitor(sdata);
2235
2236         mod_timer(&ifmgd->conn_mon_timer,
2237                   round_jiffies_up(jiffies +
2238                                    IEEE80211_CONNECTION_IDLE_TIME));
2239 out:
2240         mutex_unlock(&local->mtx);
2241 }
2242
2243 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2244                                            struct ieee80211_hdr *hdr,
2245                                            u16 tx_time)
2246 {
2247         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2248         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2249         int ac = ieee80211_ac_from_tid(tid);
2250         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2251         unsigned long now = jiffies;
2252
2253         if (likely(!tx_tspec->admitted_time))
2254                 return;
2255
2256         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2257                 tx_tspec->consumed_tx_time = 0;
2258                 tx_tspec->time_slice_start = now;
2259
2260                 if (tx_tspec->downgraded) {
2261                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2262                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2263                 }
2264         }
2265
2266         if (tx_tspec->downgraded)
2267                 return;
2268
2269         tx_tspec->consumed_tx_time += tx_time;
2270
2271         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2272                 tx_tspec->downgraded = true;
2273                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2274                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2275         }
2276 }
2277
2278 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2279                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2280 {
2281         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2282
2283         if (!ieee80211_is_data(hdr->frame_control))
2284             return;
2285
2286         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2287             sdata->u.mgd.probe_send_count > 0) {
2288                 if (ack)
2289                         ieee80211_sta_reset_conn_monitor(sdata);
2290                 else
2291                         sdata->u.mgd.nullfunc_failed = true;
2292                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2293                 return;
2294         }
2295
2296         if (ack)
2297                 ieee80211_sta_reset_conn_monitor(sdata);
2298 }
2299
2300 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2301 {
2302         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2303         const u8 *ssid;
2304         u8 *dst = ifmgd->associated->bssid;
2305         u8 unicast_limit = max(1, max_probe_tries - 3);
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 (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2325                 ifmgd->nullfunc_failed = false;
2326                 ieee80211_send_nullfunc(sdata->local, sdata, false);
2327         } else {
2328                 int ssid_len;
2329
2330                 rcu_read_lock();
2331                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2332                 if (WARN_ON_ONCE(ssid == NULL))
2333                         ssid_len = 0;
2334                 else
2335                         ssid_len = ssid[1];
2336
2337                 ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2338                                          ssid + 2, ssid_len, NULL,
2339                                          0, (u32) -1, true, 0,
2340                                          ifmgd->associated->channel, false);
2341                 rcu_read_unlock();
2342         }
2343
2344         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2345         run_again(sdata, ifmgd->probe_timeout);
2346 }
2347
2348 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2349                                    bool beacon)
2350 {
2351         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2352         bool already = false;
2353
2354         if (!ieee80211_sdata_running(sdata))
2355                 return;
2356
2357         sdata_lock(sdata);
2358
2359         if (!ifmgd->associated)
2360                 goto out;
2361
2362         mutex_lock(&sdata->local->mtx);
2363
2364         if (sdata->local->tmp_channel || sdata->local->scanning) {
2365                 mutex_unlock(&sdata->local->mtx);
2366                 goto out;
2367         }
2368
2369         if (beacon) {
2370                 mlme_dbg_ratelimited(sdata,
2371                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2372                                      beacon_loss_count);
2373
2374                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2375         }
2376
2377         /*
2378          * The driver/our work has already reported this event or the
2379          * connection monitoring has kicked in and we have already sent
2380          * a probe request. Or maybe the AP died and the driver keeps
2381          * reporting until we disassociate...
2382          *
2383          * In either case we have to ignore the current call to this
2384          * function (except for setting the correct probe reason bit)
2385          * because otherwise we would reset the timer every time and
2386          * never check whether we received a probe response!
2387          */
2388         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2389                 already = true;
2390
2391         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2392
2393         mutex_unlock(&sdata->local->mtx);
2394
2395         if (already)
2396                 goto out;
2397
2398         mutex_lock(&sdata->local->iflist_mtx);
2399         ieee80211_recalc_ps(sdata->local);
2400         mutex_unlock(&sdata->local->iflist_mtx);
2401
2402         ifmgd->probe_send_count = 0;
2403         ieee80211_mgd_probe_ap_send(sdata);
2404  out:
2405         sdata_unlock(sdata);
2406 }
2407
2408 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2409                                           struct ieee80211_vif *vif)
2410 {
2411         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2412         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2413         struct cfg80211_bss *cbss;
2414         struct sk_buff *skb;
2415         const u8 *ssid;
2416         int ssid_len;
2417
2418         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2419                 return NULL;
2420
2421         sdata_assert_lock(sdata);
2422
2423         if (ifmgd->associated)
2424                 cbss = ifmgd->associated;
2425         else if (ifmgd->auth_data)
2426                 cbss = ifmgd->auth_data->bss;
2427         else if (ifmgd->assoc_data)
2428                 cbss = ifmgd->assoc_data->bss;
2429         else
2430                 return NULL;
2431
2432         rcu_read_lock();
2433         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2434         if (WARN_ON_ONCE(ssid == NULL))
2435                 ssid_len = 0;
2436         else
2437                 ssid_len = ssid[1];
2438
2439         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2440                                         (u32) -1, cbss->channel,
2441                                         ssid + 2, ssid_len,
2442                                         NULL, 0, true);
2443         rcu_read_unlock();
2444
2445         return skb;
2446 }
2447 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2448
2449 static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
2450                                         const u8 *buf, size_t len, bool tx,
2451                                         u16 reason)
2452 {
2453         struct ieee80211_event event = {
2454                 .type = MLME_EVENT,
2455                 .u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
2456                 .u.mlme.reason = reason,
2457         };
2458
2459         if (tx)
2460                 cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
2461         else
2462                 cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);
2463
2464         drv_event_callback(sdata->local, sdata, &event);
2465 }
2466
2467 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2468 {
2469         struct ieee80211_local *local = sdata->local;
2470         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2471         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2472
2473         sdata_lock(sdata);
2474         if (!ifmgd->associated) {
2475                 sdata_unlock(sdata);
2476                 return;
2477         }
2478
2479         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2480                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2481                                true, frame_buf);
2482         mutex_lock(&local->mtx);
2483         sdata->vif.csa_active = false;
2484         ifmgd->csa_waiting_bcn = false;
2485         if (sdata->csa_block_tx) {
2486                 ieee80211_wake_vif_queues(local, sdata,
2487                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2488                 sdata->csa_block_tx = false;
2489         }
2490         mutex_unlock(&local->mtx);
2491
2492         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
2493                                     WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2494
2495         sdata_unlock(sdata);
2496 }
2497
2498 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2499 {
2500         struct ieee80211_sub_if_data *sdata =
2501                 container_of(work, struct ieee80211_sub_if_data,
2502                              u.mgd.beacon_connection_loss_work);
2503         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2504
2505         if (ifmgd->associated)
2506                 ifmgd->beacon_loss_count++;
2507
2508         if (ifmgd->connection_loss) {
2509                 sdata_info(sdata, "Connection to AP %pM lost\n",
2510                            ifmgd->bssid);
2511                 __ieee80211_disconnect(sdata);
2512         } else {
2513                 ieee80211_mgd_probe_ap(sdata, true);
2514         }
2515 }
2516
2517 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2518 {
2519         struct ieee80211_sub_if_data *sdata =
2520                 container_of(work, struct ieee80211_sub_if_data,
2521                              u.mgd.csa_connection_drop_work);
2522
2523         __ieee80211_disconnect(sdata);
2524 }
2525
2526 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2527 {
2528         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2529         struct ieee80211_hw *hw = &sdata->local->hw;
2530
2531         trace_api_beacon_loss(sdata);
2532
2533         sdata->u.mgd.connection_loss = false;
2534         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2535 }
2536 EXPORT_SYMBOL(ieee80211_beacon_loss);
2537
2538 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2539 {
2540         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2541         struct ieee80211_hw *hw = &sdata->local->hw;
2542
2543         trace_api_connection_loss(sdata);
2544
2545         sdata->u.mgd.connection_loss = true;
2546         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2547 }
2548 EXPORT_SYMBOL(ieee80211_connection_loss);
2549
2550
2551 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2552                                         bool assoc)
2553 {
2554         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2555
2556         sdata_assert_lock(sdata);
2557
2558         if (!assoc) {
2559                 /*
2560                  * we are not authenticated yet, the only timer that could be
2561                  * running is the timeout for the authentication response which
2562                  * which is not relevant anymore.
2563                  */
2564                 del_timer_sync(&sdata->u.mgd.timer);
2565                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2566
2567                 eth_zero_addr(sdata->u.mgd.bssid);
2568                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2569                 sdata->u.mgd.flags = 0;
2570                 mutex_lock(&sdata->local->mtx);
2571                 ieee80211_vif_release_channel(sdata);
2572                 mutex_unlock(&sdata->local->mtx);
2573         }
2574
2575         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2576         kfree(auth_data);
2577         sdata->u.mgd.auth_data = NULL;
2578 }
2579
2580 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2581                                          bool assoc, bool abandon)
2582 {
2583         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2584
2585         sdata_assert_lock(sdata);
2586
2587         if (!assoc) {
2588                 /*
2589                  * we are not associated yet, the only timer that could be
2590                  * running is the timeout for the association response which
2591                  * which is not relevant anymore.
2592                  */
2593                 del_timer_sync(&sdata->u.mgd.timer);
2594                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2595
2596                 eth_zero_addr(sdata->u.mgd.bssid);
2597                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2598                 sdata->u.mgd.flags = 0;
2599                 sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
2600                 mutex_lock(&sdata->local->mtx);
2601                 ieee80211_vif_release_channel(sdata);
2602                 mutex_unlock(&sdata->local->mtx);
2603
2604                 if (abandon)
2605                         cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2606         }
2607
2608         kfree(assoc_data);
2609         sdata->u.mgd.assoc_data = NULL;
2610 }
2611
2612 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2613                                      struct ieee80211_mgmt *mgmt, size_t len)
2614 {
2615         struct ieee80211_local *local = sdata->local;
2616         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2617         u8 *pos;
2618         struct ieee802_11_elems elems;
2619         u32 tx_flags = 0;
2620
2621         pos = mgmt->u.auth.variable;
2622         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2623         if (!elems.challenge)
2624                 return;
2625         auth_data->expected_transaction = 4;
2626         drv_mgd_prepare_tx(sdata->local, sdata);
2627         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2628                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2629                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2630         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2631                             elems.challenge - 2, elems.challenge_len + 2,
2632                             auth_data->bss->bssid, auth_data->bss->bssid,
2633                             auth_data->key, auth_data->key_len,
2634                             auth_data->key_idx, tx_flags);
2635 }
2636
2637 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2638                                    struct ieee80211_mgmt *mgmt, size_t len)
2639 {
2640         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2641         u8 bssid[ETH_ALEN];
2642         u16 auth_alg, auth_transaction, status_code;
2643         struct sta_info *sta;
2644         struct ieee80211_event event = {
2645                 .type = MLME_EVENT,
2646                 .u.mlme.data = AUTH_EVENT,
2647         };
2648
2649         sdata_assert_lock(sdata);
2650
2651         if (len < 24 + 6)
2652                 return;
2653
2654         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2655                 return;
2656
2657         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2658
2659         if (!ether_addr_equal(bssid, mgmt->bssid))
2660                 return;
2661
2662         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2663         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2664         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2665
2666         if (auth_alg != ifmgd->auth_data->algorithm ||
2667             auth_transaction != ifmgd->auth_data->expected_transaction) {
2668                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2669                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2670                            auth_transaction,
2671                            ifmgd->auth_data->expected_transaction);
2672                 return;
2673         }
2674
2675         if (status_code != WLAN_STATUS_SUCCESS) {
2676                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2677                            mgmt->sa, status_code);
2678                 ieee80211_destroy_auth_data(sdata, false);
2679                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2680                 event.u.mlme.status = MLME_DENIED;
2681                 event.u.mlme.reason = status_code;
2682                 drv_event_callback(sdata->local, sdata, &event);
2683                 return;
2684         }
2685
2686         switch (ifmgd->auth_data->algorithm) {
2687         case WLAN_AUTH_OPEN:
2688         case WLAN_AUTH_LEAP:
2689         case WLAN_AUTH_FT:
2690         case WLAN_AUTH_SAE:
2691                 break;
2692         case WLAN_AUTH_SHARED_KEY:
2693                 if (ifmgd->auth_data->expected_transaction != 4) {
2694                         ieee80211_auth_challenge(sdata, mgmt, len);
2695                         /* need another frame */
2696                         return;
2697                 }
2698                 break;
2699         default:
2700                 WARN_ONCE(1, "invalid auth alg %d",
2701                           ifmgd->auth_data->algorithm);
2702                 return;
2703         }
2704
2705         event.u.mlme.status = MLME_SUCCESS;
2706         drv_event_callback(sdata->local, sdata, &event);
2707         sdata_info(sdata, "authenticated\n");
2708         ifmgd->auth_data->done = true;
2709         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2710         ifmgd->auth_data->timeout_started = true;
2711         run_again(sdata, ifmgd->auth_data->timeout);
2712
2713         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2714             ifmgd->auth_data->expected_transaction != 2) {
2715                 /*
2716                  * Report auth frame to user space for processing since another
2717                  * round of Authentication frames is still needed.
2718                  */
2719                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2720                 return;
2721         }
2722
2723         /* move station state to auth */
2724         mutex_lock(&sdata->local->sta_mtx);
2725         sta = sta_info_get(sdata, bssid);
2726         if (!sta) {
2727                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2728                 goto out_err;
2729         }
2730         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2731                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2732                 goto out_err;
2733         }
2734         mutex_unlock(&sdata->local->sta_mtx);
2735
2736         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2737         return;
2738  out_err:
2739         mutex_unlock(&sdata->local->sta_mtx);
2740         /* ignore frame -- wait for timeout */
2741 }
2742
2743 #define case_WLAN(type) \
2744         case WLAN_REASON_##type: return #type
2745
2746 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2747 {
2748         switch (reason_code) {
2749         case_WLAN(UNSPECIFIED);
2750         case_WLAN(PREV_AUTH_NOT_VALID);
2751         case_WLAN(DEAUTH_LEAVING);
2752         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2753         case_WLAN(DISASSOC_AP_BUSY);
2754         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2755         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2756         case_WLAN(DISASSOC_STA_HAS_LEFT);
2757         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2758         case_WLAN(DISASSOC_BAD_POWER);
2759         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2760         case_WLAN(INVALID_IE);
2761         case_WLAN(MIC_FAILURE);
2762         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2763         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2764         case_WLAN(IE_DIFFERENT);
2765         case_WLAN(INVALID_GROUP_CIPHER);
2766         case_WLAN(INVALID_PAIRWISE_CIPHER);
2767         case_WLAN(INVALID_AKMP);
2768         case_WLAN(UNSUPP_RSN_VERSION);
2769         case_WLAN(INVALID_RSN_IE_CAP);
2770         case_WLAN(IEEE8021X_FAILED);
2771         case_WLAN(CIPHER_SUITE_REJECTED);
2772         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2773         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2774         case_WLAN(DISASSOC_LOW_ACK);
2775         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2776         case_WLAN(QSTA_LEAVE_QBSS);
2777         case_WLAN(QSTA_NOT_USE);
2778         case_WLAN(QSTA_REQUIRE_SETUP);
2779         case_WLAN(QSTA_TIMEOUT);
2780         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2781         case_WLAN(MESH_PEER_CANCELED);
2782         case_WLAN(MESH_MAX_PEERS);
2783         case_WLAN(MESH_CONFIG);
2784         case_WLAN(MESH_CLOSE);
2785         case_WLAN(MESH_MAX_RETRIES);
2786         case_WLAN(MESH_CONFIRM_TIMEOUT);
2787         case_WLAN(MESH_INVALID_GTK);
2788         case_WLAN(MESH_INCONSISTENT_PARAM);
2789         case_WLAN(MESH_INVALID_SECURITY);
2790         case_WLAN(MESH_PATH_ERROR);
2791         case_WLAN(MESH_PATH_NOFORWARD);
2792         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2793         case_WLAN(MAC_EXISTS_IN_MBSS);
2794         case_WLAN(MESH_CHAN_REGULATORY);
2795         case_WLAN(MESH_CHAN);
2796         default: return "<unknown>";
2797         }
2798 }
2799
2800 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2801                                      struct ieee80211_mgmt *mgmt, size_t len)
2802 {
2803         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2804         u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2805
2806         sdata_assert_lock(sdata);
2807
2808         if (len < 24 + 2)
2809                 return;
2810
2811         if (ifmgd->associated &&
2812             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
2813                 const u8 *bssid = ifmgd->associated->bssid;
2814
2815                 sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2816                            bssid, reason_code,
2817                            ieee80211_get_reason_code_string(reason_code));
2818
2819                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2820
2821                 ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
2822                                             reason_code);
2823                 return;
2824         }
2825
2826         if (ifmgd->assoc_data &&
2827             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2828                 const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2829
2830                 sdata_info(sdata,
2831                            "deauthenticated from %pM while associating (Reason: %u=%s)\n",
2832                            bssid, reason_code,
2833                            ieee80211_get_reason_code_string(reason_code));
2834
2835                 ieee80211_destroy_assoc_data(sdata, false, true);
2836
2837                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2838                 return;
2839         }
2840 }
2841
2842
2843 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2844                                        struct ieee80211_mgmt *mgmt, size_t len)
2845 {
2846         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2847         u16 reason_code;
2848
2849         sdata_assert_lock(sdata);
2850
2851         if (len < 24 + 2)
2852                 return;
2853
2854         if (!ifmgd->associated ||
2855             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2856                 return;
2857
2858         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2859
2860         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2861                    mgmt->sa, reason_code);
2862
2863         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2864
2865         ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2866 }
2867
2868 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2869                                 u8 *supp_rates, unsigned int supp_rates_len,
2870                                 u32 *rates, u32 *basic_rates,
2871                                 bool *have_higher_than_11mbit,
2872                                 int *min_rate, int *min_rate_index,
2873                                 int shift, u32 rate_flags)
2874 {
2875         int i, j;
2876
2877         for (i = 0; i < supp_rates_len; i++) {
2878                 int rate = supp_rates[i] & 0x7f;
2879                 bool is_basic = !!(supp_rates[i] & 0x80);
2880
2881                 if ((rate * 5 * (1 << shift)) > 110)
2882                         *have_higher_than_11mbit = true;
2883
2884                 /*
2885                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2886                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2887                  *
2888                  * Note: Even through the membership selector and the basic
2889                  *       rate flag share the same bit, they are not exactly
2890                  *       the same.
2891                  */
2892                 if (!!(supp_rates[i] & 0x80) &&
2893                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2894                         continue;
2895
2896                 for (j = 0; j < sband->n_bitrates; j++) {
2897                         struct ieee80211_rate *br;
2898                         int brate;
2899
2900                         br = &sband->bitrates[j];
2901                         if ((rate_flags & br->flags) != rate_flags)
2902                                 continue;
2903
2904                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2905                         if (brate == rate) {
2906                                 *rates |= BIT(j);
2907                                 if (is_basic)
2908                                         *basic_rates |= BIT(j);
2909                                 if ((rate * 5) < *min_rate) {
2910                                         *min_rate = rate * 5;
2911                                         *min_rate_index = j;
2912                                 }
2913                                 break;
2914                         }
2915                 }
2916         }
2917 }
2918
2919 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2920                                     struct cfg80211_bss *cbss,
2921                                     struct ieee80211_mgmt *mgmt, size_t len)
2922 {
2923         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2924         struct ieee80211_local *local = sdata->local;
2925         struct ieee80211_supported_band *sband;
2926         struct sta_info *sta;
2927         u8 *pos;
2928         u16 capab_info, aid;
2929         struct ieee802_11_elems elems;
2930         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2931         const struct cfg80211_bss_ies *bss_ies = NULL;
2932         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2933         u32 changed = 0;
2934         int err;
2935         bool ret;
2936
2937         /* AssocResp and ReassocResp have identical structure */
2938
2939         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2940         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2941
2942         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2943                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2944                            aid);
2945         aid &= ~(BIT(15) | BIT(14));
2946
2947         ifmgd->broken_ap = false;
2948
2949         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2950                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2951                            aid);
2952                 aid = 0;
2953                 ifmgd->broken_ap = true;
2954         }
2955
2956         pos = mgmt->u.assoc_resp.variable;
2957         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2958
2959         if (!elems.supp_rates) {
2960                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2961                 return false;
2962         }
2963
2964         ifmgd->aid = aid;
2965         ifmgd->tdls_chan_switch_prohibited =
2966                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2967                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2968
2969         /*
2970          * Some APs are erroneously not including some information in their
2971          * (re)association response frames. Try to recover by using the data
2972          * from the beacon or probe response. This seems to afflict mobile
2973          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2974          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2975          */
2976         if ((assoc_data->wmm && !elems.wmm_param) ||
2977             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2978              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2979             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2980              (!elems.vht_cap_elem || !elems.vht_operation))) {
2981                 const struct cfg80211_bss_ies *ies;
2982                 struct ieee802_11_elems bss_elems;
2983
2984                 rcu_read_lock();
2985                 ies = rcu_dereference(cbss->ies);
2986                 if (ies)
2987                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2988                                           GFP_ATOMIC);
2989                 rcu_read_unlock();
2990                 if (!bss_ies)
2991                         return false;
2992
2993                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2994                                        false, &bss_elems);
2995                 if (assoc_data->wmm &&
2996                     !elems.wmm_param && bss_elems.wmm_param) {
2997                         elems.wmm_param = bss_elems.wmm_param;
2998                         sdata_info(sdata,
2999                                    "AP bug: WMM param missing from AssocResp\n");
3000                 }
3001
3002                 /*
3003                  * Also check if we requested HT/VHT, otherwise the AP doesn't
3004                  * have to include the IEs in the (re)association response.
3005                  */
3006                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
3007                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
3008                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
3009                         sdata_info(sdata,
3010                                    "AP bug: HT capability missing from AssocResp\n");
3011                 }
3012                 if (!elems.ht_operation && bss_elems.ht_operation &&
3013                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
3014                         elems.ht_operation = bss_elems.ht_operation;
3015                         sdata_info(sdata,
3016                                    "AP bug: HT operation missing from AssocResp\n");
3017                 }
3018                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
3019                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
3020                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
3021                         sdata_info(sdata,
3022                                    "AP bug: VHT capa missing from AssocResp\n");
3023                 }
3024                 if (!elems.vht_operation && bss_elems.vht_operation &&
3025                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
3026                         elems.vht_operation = bss_elems.vht_operation;
3027                         sdata_info(sdata,
3028                                    "AP bug: VHT operation missing from AssocResp\n");
3029                 }
3030         }
3031
3032         /*
3033          * We previously checked these in the beacon/probe response, so
3034          * they should be present here. This is just a safety net.
3035          */
3036         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3037             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
3038                 sdata_info(sdata,
3039                            "HT AP is missing WMM params or HT capability/operation\n");
3040                 ret = false;
3041                 goto out;
3042         }
3043
3044         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3045             (!elems.vht_cap_elem || !elems.vht_operation)) {
3046                 sdata_info(sdata,
3047                            "VHT AP is missing VHT capability/operation\n");
3048                 ret = false;
3049                 goto out;
3050         }
3051
3052         mutex_lock(&sdata->local->sta_mtx);
3053         /*
3054          * station info was already allocated and inserted before
3055          * the association and should be available to us
3056          */
3057         sta = sta_info_get(sdata, cbss->bssid);
3058         if (WARN_ON(!sta)) {
3059                 mutex_unlock(&sdata->local->sta_mtx);
3060                 ret = false;
3061                 goto out;
3062         }
3063
3064         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
3065
3066         /* Set up internal HT/VHT capabilities */
3067         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
3068                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3069                                                   elems.ht_cap_elem, sta);
3070
3071         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
3072                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3073                                                     elems.vht_cap_elem, sta);
3074
3075         /*
3076          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
3077          * in their association response, so ignore that data for our own
3078          * configuration. If it changed since the last beacon, we'll get the
3079          * next beacon and update then.
3080          */
3081
3082         /*
3083          * If an operating mode notification IE is present, override the
3084          * NSS calculation (that would be done in rate_control_rate_init())
3085          * and use the # of streams from that element.
3086          */
3087         if (elems.opmode_notif &&
3088             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
3089                 u8 nss;
3090
3091                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
3092                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
3093                 nss += 1;
3094                 sta->sta.rx_nss = nss;
3095         }
3096
3097         rate_control_rate_init(sta);
3098
3099         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
3100                 set_sta_flag(sta, WLAN_STA_MFP);
3101                 sta->sta.mfp = true;
3102         } else {
3103                 sta->sta.mfp = false;
3104         }
3105
3106         sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3107
3108         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3109         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
3110                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
3111         if (err) {
3112                 sdata_info(sdata,
3113                            "failed to move station %pM to desired state\n",
3114                            sta->sta.addr);
3115                 WARN_ON(__sta_info_destroy(sta));
3116                 mutex_unlock(&sdata->local->sta_mtx);
3117                 ret = false;
3118                 goto out;
3119         }
3120
3121         mutex_unlock(&sdata->local->sta_mtx);
3122
3123         /*
3124          * Always handle WMM once after association regardless
3125          * of the first value the AP uses. Setting -1 here has
3126          * that effect because the AP values is an unsigned
3127          * 4-bit value.
3128          */
3129         ifmgd->wmm_last_param_set = -1;
3130
3131         if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3132                 ieee80211_set_wmm_default(sdata, false, false);
3133         } else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3134                                              elems.wmm_param_len)) {
3135                 /* still enable QoS since we might have HT/VHT */
3136                 ieee80211_set_wmm_default(sdata, false, true);
3137                 /* set the disable-WMM flag in this case to disable
3138                  * tracking WMM parameter changes in the beacon if
3139                  * the parameters weren't actually valid. Doing so
3140                  * avoids changing parameters very strangely when
3141                  * the AP is going back and forth between valid and
3142                  * invalid parameters.
3143                  */
3144                 ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
3145         }
3146         changed |= BSS_CHANGED_QOS;
3147
3148         /* set AID and assoc capability,
3149          * ieee80211_set_associated() will tell the driver */
3150         bss_conf->aid = aid;
3151         bss_conf->assoc_capability = capab_info;
3152         ieee80211_set_associated(sdata, cbss, changed);
3153
3154         /*
3155          * If we're using 4-addr mode, let the AP know that we're
3156          * doing so, so that it can create the STA VLAN on its side
3157          */
3158         if (ifmgd->use_4addr)
3159                 ieee80211_send_4addr_nullfunc(local, sdata);
3160
3161         /*
3162          * Start timer to probe the connection to the AP now.
3163          * Also start the timer that will detect beacon loss.
3164          */
3165         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3166         ieee80211_sta_reset_beacon_monitor(sdata);
3167
3168         ret = true;
3169  out:
3170         kfree(bss_ies);
3171         return ret;
3172 }
3173
3174 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3175                                          struct ieee80211_mgmt *mgmt,
3176                                          size_t len)
3177 {
3178         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3179         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3180         u16 capab_info, status_code, aid;
3181         struct ieee802_11_elems elems;
3182         int ac, uapsd_queues = -1;
3183         u8 *pos;
3184         bool reassoc;
3185         struct cfg80211_bss *bss;
3186         struct ieee80211_event event = {
3187                 .type = MLME_EVENT,
3188                 .u.mlme.data = ASSOC_EVENT,
3189         };
3190
3191         sdata_assert_lock(sdata);
3192
3193         if (!assoc_data)
3194                 return;
3195         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3196                 return;
3197
3198         /*
3199          * AssocResp and ReassocResp have identical structure, so process both
3200          * of them in this function.
3201          */
3202
3203         if (len < 24 + 6)
3204                 return;
3205
3206         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3207         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3208         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3209         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3210
3211         sdata_info(sdata,
3212                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3213                    reassoc ? "Rea" : "A", mgmt->sa,
3214                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3215
3216         pos = mgmt->u.assoc_resp.variable;
3217         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3218
3219         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3220             elems.timeout_int &&
3221             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3222                 u32 tu, ms;
3223                 tu = le32_to_cpu(elems.timeout_int->value);
3224                 ms = tu * 1024 / 1000;
3225                 sdata_info(sdata,
3226                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3227                            mgmt->sa, tu, ms);
3228                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3229                 assoc_data->timeout_started = true;
3230                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3231                         run_again(sdata, assoc_data->timeout);
3232                 return;
3233         }
3234
3235         bss = assoc_data->bss;
3236
3237         if (status_code != WLAN_STATUS_SUCCESS) {
3238                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3239                            mgmt->sa, status_code);
3240                 ieee80211_destroy_assoc_data(sdata, false, false);
3241                 event.u.mlme.status = MLME_DENIED;
3242                 event.u.mlme.reason = status_code;
3243                 drv_event_callback(sdata->local, sdata, &event);
3244         } else {
3245                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3246                         /* oops -- internal error -- send timeout for now */
3247                         ieee80211_destroy_assoc_data(sdata, false, false);
3248                         cfg80211_assoc_timeout(sdata->dev, bss);
3249                         return;
3250                 }
3251                 event.u.mlme.status = MLME_SUCCESS;
3252                 drv_event_callback(sdata->local, sdata, &event);
3253                 sdata_info(sdata, "associated\n");
3254
3255                 /*
3256                  * destroy assoc_data afterwards, as otherwise an idle
3257                  * recalc after assoc_data is NULL but before associated
3258                  * is set can cause the interface to go idle
3259                  */
3260                 ieee80211_destroy_assoc_data(sdata, true, false);
3261
3262                 /* get uapsd queues configuration */
3263                 uapsd_queues = 0;
3264                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3265                         if (sdata->tx_conf[ac].uapsd)
3266                                 uapsd_queues |= BIT(ac);
3267         }
3268
3269         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3270 }
3271
3272 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3273                                   struct ieee80211_mgmt *mgmt, size_t len,
3274                                   struct ieee80211_rx_status *rx_status,
3275                                   struct ieee802_11_elems *elems)
3276 {
3277         struct ieee80211_local *local = sdata->local;
3278         struct ieee80211_bss *bss;
3279         struct ieee80211_channel *channel;
3280
3281         sdata_assert_lock(sdata);
3282
3283         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3284         if (!channel)
3285                 return;
3286
3287         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3288                                         channel);
3289         if (bss) {
3290                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3291                 ieee80211_rx_bss_put(local, bss);
3292         }
3293 }
3294
3295
3296 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3297                                          struct sk_buff *skb)
3298 {
3299         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3300         struct ieee80211_if_managed *ifmgd;
3301         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3302         size_t baselen, len = skb->len;
3303         struct ieee802_11_elems elems;
3304
3305         ifmgd = &sdata->u.mgd;
3306
3307         sdata_assert_lock(sdata);
3308
3309         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3310                 return; /* ignore ProbeResp to foreign address */
3311
3312         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3313         if (baselen > len)
3314                 return;
3315
3316         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3317                                false, &elems);
3318
3319         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3320
3321         if (ifmgd->associated &&
3322             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3323                 ieee80211_reset_ap_probe(sdata);
3324 }
3325
3326 /*
3327  * This is the canonical list of information elements we care about,
3328  * the filter code also gives us all changes to the Microsoft OUI
3329  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3330  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3331  * changes to requested client power.
3332  *
3333  * We implement beacon filtering in software since that means we can
3334  * avoid processing the frame here and in cfg80211, and userspace
3335  * will not be able to tell whether the hardware supports it or not.
3336  *
3337  * XXX: This list needs to be dynamic -- userspace needs to be able to
3338  *      add items it requires. It also needs to be able to tell us to
3339  *      look out for other vendor IEs.
3340  */
3341 static const u64 care_about_ies =
3342         (1ULL << WLAN_EID_COUNTRY) |
3343         (1ULL << WLAN_EID_ERP_INFO) |
3344         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3345         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3346         (1ULL << WLAN_EID_HT_CAPABILITY) |
3347         (1ULL << WLAN_EID_HT_OPERATION) |
3348         (1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3349
3350 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3351                                      struct ieee80211_mgmt *mgmt, size_t len,
3352                                      struct ieee80211_rx_status *rx_status)
3353 {
3354         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3355         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3356         size_t baselen;
3357         struct ieee802_11_elems elems;
3358         struct ieee80211_local *local = sdata->local;
3359         struct ieee80211_chanctx_conf *chanctx_conf;
3360         struct ieee80211_channel *chan;
3361         struct sta_info *sta;
3362         u32 changed = 0;
3363         bool erp_valid;
3364         u8 erp_value = 0;
3365         u32 ncrc;
3366         u8 *bssid;
3367         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3368
3369         sdata_assert_lock(sdata);
3370
3371         /* Process beacon from the current BSS */
3372         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3373         if (baselen > len)
3374                 return;
3375
3376         rcu_read_lock();
3377         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3378         if (!chanctx_conf) {
3379                 rcu_read_unlock();
3380                 return;
3381         }
3382
3383         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3384                 rcu_read_unlock();
3385                 return;
3386         }
3387         chan = chanctx_conf->def.chan;
3388         rcu_read_unlock();
3389
3390         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3391             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3392                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3393                                        len - baselen, false, &elems);
3394
3395                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3396                 if (elems.tim && !elems.parse_error) {
3397                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3398                         ifmgd->dtim_period = tim_ie->dtim_period;
3399                 }
3400                 ifmgd->have_beacon = true;
3401                 ifmgd->assoc_data->need_beacon = false;
3402                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3403                         sdata->vif.bss_conf.sync_tsf =
3404                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3405                         sdata->vif.bss_conf.sync_device_ts =
3406                                 rx_status->device_timestamp;
3407                         if (elems.tim)
3408                                 sdata->vif.bss_conf.sync_dtim_count =
3409                                         elems.tim->dtim_count;
3410                         else
3411                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3412                 }
3413                 /* continue assoc process */
3414                 ifmgd->assoc_data->timeout = jiffies;
3415                 ifmgd->assoc_data->timeout_started = true;
3416                 run_again(sdata, ifmgd->assoc_data->timeout);
3417                 return;
3418         }
3419
3420         if (!ifmgd->associated ||
3421             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3422                 return;
3423         bssid = ifmgd->associated->bssid;
3424
3425         /* Track average RSSI from the Beacon frames of the current AP */
3426         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3427                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3428                 ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3429                 ifmgd->last_cqm_event_signal = 0;
3430                 ifmgd->count_beacon_signal = 1;
3431                 ifmgd->last_ave_beacon_signal = 0;
3432         } else {
3433                 ifmgd->count_beacon_signal++;
3434         }
3435
3436         ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);
3437
3438         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3439             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3440                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3441                 int last_sig = ifmgd->last_ave_beacon_signal;
3442                 struct ieee80211_event event = {
3443                         .type = RSSI_EVENT,
3444                 };
3445
3446                 /*
3447                  * if signal crosses either of the boundaries, invoke callback
3448                  * with appropriate parameters
3449                  */
3450                 if (sig > ifmgd->rssi_max_thold &&
3451                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3452                         ifmgd->last_ave_beacon_signal = sig;
3453                         event.u.rssi.data = RSSI_EVENT_HIGH;
3454                         drv_event_callback(local, sdata, &event);
3455                 } else if (sig < ifmgd->rssi_min_thold &&
3456                            (last_sig >= ifmgd->rssi_max_thold ||
3457                            last_sig == 0)) {
3458                         ifmgd->last_ave_beacon_signal = sig;
3459                         event.u.rssi.data = RSSI_EVENT_LOW;
3460                         drv_event_callback(local, sdata, &event);
3461                 }
3462         }
3463
3464         if (bss_conf->cqm_rssi_thold &&
3465             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3466             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3467                 int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3468                 int last_event = ifmgd->last_cqm_event_signal;
3469                 int thold = bss_conf->cqm_rssi_thold;
3470                 int hyst = bss_conf->cqm_rssi_hyst;
3471
3472                 if (sig < thold &&
3473                     (last_event == 0 || sig < last_event - hyst)) {
3474                         ifmgd->last_cqm_event_signal = sig;
3475                         ieee80211_cqm_rssi_notify(
3476                                 &sdata->vif,
3477                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3478                                 GFP_KERNEL);
3479                 } else if (sig > thold &&
3480                            (last_event == 0 || sig > last_event + hyst)) {
3481                         ifmgd->last_cqm_event_signal = sig;
3482                         ieee80211_cqm_rssi_notify(
3483                                 &sdata->vif,
3484                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3485                                 GFP_KERNEL);
3486                 }
3487         }
3488
3489         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3490                 mlme_dbg_ratelimited(sdata,
3491                                      "cancelling AP probe due to a received beacon\n");
3492                 ieee80211_reset_ap_probe(sdata);
3493         }
3494
3495         /*
3496          * Push the beacon loss detection into the future since
3497          * we are processing a beacon from the AP just now.
3498          */
3499         ieee80211_sta_reset_beacon_monitor(sdata);
3500
3501         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3502         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3503                                           len - baselen, false, &elems,
3504                                           care_about_ies, ncrc);
3505
3506         if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
3507             ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
3508                 if (local->hw.conf.dynamic_ps_timeout > 0) {
3509                         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3510                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3511                                 ieee80211_hw_config(local,
3512                                                     IEEE80211_CONF_CHANGE_PS);
3513                         }
3514                         ieee80211_send_nullfunc(local, sdata, false);
3515                 } else if (!local->pspolling && sdata->u.mgd.powersave) {
3516                         local->pspolling = true;
3517
3518                         /*
3519                          * Here is assumed that the driver will be
3520                          * able to send ps-poll frame and receive a
3521                          * response even though power save mode is
3522                          * enabled, but some drivers might require
3523                          * to disable power save here. This needs
3524                          * to be investigated.
3525                          */
3526                         ieee80211_send_pspoll(local, sdata);
3527                 }
3528         }
3529
3530         if (sdata->vif.p2p) {
3531                 struct ieee80211_p2p_noa_attr noa = {};
3532                 int ret;
3533
3534                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3535                                             len - baselen,
3536                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3537                                             (u8 *) &noa, sizeof(noa));
3538                 if (ret >= 2) {
3539                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3540                                 /* valid noa_attr and index changed */
3541                                 sdata->u.mgd.p2p_noa_index = noa.index;
3542                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3543                                 changed |= BSS_CHANGED_P2P_PS;
3544                                 /*
3545                                  * make sure we update all information, the CRC
3546                                  * mechanism doesn't look at P2P attributes.
3547                                  */
3548                                 ifmgd->beacon_crc_valid = false;
3549                         }
3550                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3551                         /* noa_attr not found and we had valid noa_attr before */
3552                         sdata->u.mgd.p2p_noa_index = -1;
3553                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3554                         changed |= BSS_CHANGED_P2P_PS;
3555                         ifmgd->beacon_crc_valid = false;
3556                 }
3557         }
3558
3559         if (ifmgd->csa_waiting_bcn)
3560                 ieee80211_chswitch_post_beacon(sdata);
3561
3562         /*
3563          * Update beacon timing and dtim count on every beacon appearance. This
3564          * will allow the driver to use the most updated values. Do it before
3565          * comparing this one with last received beacon.
3566          * IMPORTANT: These parameters would possibly be out of sync by the time
3567          * the driver will use them. The synchronized view is currently
3568          * guaranteed only in certain callbacks.
3569          */
3570         if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3571                 sdata->vif.bss_conf.sync_tsf =
3572                         le64_to_cpu(mgmt->u.beacon.timestamp);
3573                 sdata->vif.bss_conf.sync_device_ts =
3574                         rx_status->device_timestamp;
3575                 if (elems.tim)
3576                         sdata->vif.bss_conf.sync_dtim_count =
3577                                 elems.tim->dtim_count;
3578                 else
3579                         sdata->vif.bss_conf.sync_dtim_count = 0;
3580         }
3581
3582         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3583                 return;
3584         ifmgd->beacon_crc = ncrc;
3585         ifmgd->beacon_crc_valid = true;
3586
3587         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3588
3589         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3590                                          rx_status->device_timestamp,
3591                                          &elems, true);
3592
3593         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3594             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3595                                      elems.wmm_param_len))
3596                 changed |= BSS_CHANGED_QOS;
3597
3598         /*
3599          * If we haven't had a beacon before, tell the driver about the
3600          * DTIM period (and beacon timing if desired) now.
3601          */
3602         if (!ifmgd->have_beacon) {
3603                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3604                 if (elems.tim)
3605                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3606                 else
3607                         bss_conf->dtim_period = 1;
3608
3609                 changed |= BSS_CHANGED_BEACON_INFO;
3610                 ifmgd->have_beacon = true;
3611
3612                 mutex_lock(&local->iflist_mtx);
3613                 ieee80211_recalc_ps(local);
3614                 mutex_unlock(&local->iflist_mtx);
3615
3616                 ieee80211_recalc_ps_vif(sdata);
3617         }
3618
3619         if (elems.erp_info) {
3620                 erp_valid = true;
3621                 erp_value = elems.erp_info[0];
3622         } else {
3623                 erp_valid = false;
3624         }
3625         changed |= ieee80211_handle_bss_capability(sdata,
3626                         le16_to_cpu(mgmt->u.beacon.capab_info),
3627                         erp_valid, erp_value);
3628
3629         mutex_lock(&local->sta_mtx);
3630         sta = sta_info_get(sdata, bssid);
3631
3632         if (ieee80211_config_bw(sdata, sta,
3633                                 elems.ht_cap_elem, elems.ht_operation,
3634                                 elems.vht_operation, bssid, &changed)) {
3635                 mutex_unlock(&local->sta_mtx);
3636                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3637                                        WLAN_REASON_DEAUTH_LEAVING,
3638                                        true, deauth_buf);
3639                 ieee80211_report_disconnect(sdata, deauth_buf,
3640                                             sizeof(deauth_buf), true,
3641                                             WLAN_REASON_DEAUTH_LEAVING);
3642                 return;
3643         }
3644
3645         if (sta && elems.opmode_notif)
3646                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3647                                             rx_status->band);
3648         mutex_unlock(&local->sta_mtx);
3649
3650         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3651                                                elems.country_elem,
3652                                                elems.country_elem_len,
3653                                                elems.pwr_constr_elem,
3654                                                elems.cisco_dtpc_elem);
3655
3656         ieee80211_bss_info_change_notify(sdata, changed);
3657 }
3658
3659 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3660                                   struct sk_buff *skb)
3661 {
3662         struct ieee80211_rx_status *rx_status;
3663         struct ieee80211_mgmt *mgmt;
3664         u16 fc;
3665         struct ieee802_11_elems elems;
3666         int ies_len;
3667
3668         rx_status = (struct ieee80211_rx_status *) skb->cb;
3669         mgmt = (struct ieee80211_mgmt *) skb->data;
3670         fc = le16_to_cpu(mgmt->frame_control);
3671
3672         sdata_lock(sdata);
3673
3674         switch (fc & IEEE80211_FCTL_STYPE) {
3675         case IEEE80211_STYPE_BEACON:
3676                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3677                 break;
3678         case IEEE80211_STYPE_PROBE_RESP:
3679                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3680                 break;
3681         case IEEE80211_STYPE_AUTH:
3682                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3683                 break;
3684         case IEEE80211_STYPE_DEAUTH:
3685                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3686                 break;
3687         case IEEE80211_STYPE_DISASSOC:
3688                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3689                 break;
3690         case IEEE80211_STYPE_ASSOC_RESP:
3691         case IEEE80211_STYPE_REASSOC_RESP:
3692                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3693                 break;
3694         case IEEE80211_STYPE_ACTION:
3695                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3696                         ies_len = skb->len -
3697                                   offsetof(struct ieee80211_mgmt,
3698                                            u.action.u.chan_switch.variable);
3699
3700                         if (ies_len < 0)
3701                                 break;
3702
3703                         ieee802_11_parse_elems(
3704                                 mgmt->u.action.u.chan_switch.variable,
3705                                 ies_len, true, &elems);
3706
3707                         if (elems.parse_error)
3708                                 break;
3709
3710                         ieee80211_sta_process_chanswitch(sdata,
3711                                                  rx_status->mactime,
3712                                                  rx_status->device_timestamp,
3713                                                  &elems, false);
3714                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3715                         ies_len = skb->len -
3716                                   offsetof(struct ieee80211_mgmt,
3717                                            u.action.u.ext_chan_switch.variable);
3718
3719                         if (ies_len < 0)
3720                                 break;
3721
3722                         ieee802_11_parse_elems(
3723                                 mgmt->u.action.u.ext_chan_switch.variable,
3724                                 ies_len, true, &elems);
3725
3726                         if (elems.parse_error)
3727                                 break;
3728
3729                         /* for the handling code pretend this was also an IE */
3730                         elems.ext_chansw_ie =
3731                                 &mgmt->u.action.u.ext_chan_switch.data;
3732
3733                         ieee80211_sta_process_chanswitch(sdata,
3734                                                  rx_status->mactime,
3735                                                  rx_status->device_timestamp,
3736                                                  &elems, false);
3737                 }
3738                 break;
3739         }
3740         sdata_unlock(sdata);
3741 }
3742
3743 static void ieee80211_sta_timer(unsigned long data)
3744 {
3745         struct ieee80211_sub_if_data *sdata =
3746                 (struct ieee80211_sub_if_data *) data;
3747
3748         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3749 }
3750
3751 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3752                                           u8 *bssid, u8 reason, bool tx)
3753 {
3754         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3755
3756         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3757                                tx, frame_buf);
3758
3759         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
3760                                     reason);
3761 }
3762
3763 static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
3764 {
3765         struct ieee80211_local *local = sdata->local;
3766         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3767         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3768         u32 tx_flags = 0;
3769         u16 trans = 1;
3770         u16 status = 0;
3771
3772         sdata_assert_lock(sdata);
3773
3774         if (WARN_ON_ONCE(!auth_data))
3775                 return -EINVAL;
3776
3777         auth_data->tries++;
3778
3779         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3780                 sdata_info(sdata, "authentication with %pM timed out\n",
3781                            auth_data->bss->bssid);
3782
3783                 /*
3784                  * Most likely AP is not in the range so remove the
3785                  * bss struct for that AP.
3786                  */
3787                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3788
3789                 return -ETIMEDOUT;
3790         }
3791
3792         drv_mgd_prepare_tx(local, sdata);
3793
3794         sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3795                    auth_data->bss->bssid, auth_data->tries,
3796                    IEEE80211_AUTH_MAX_TRIES);
3797
3798         auth_data->expected_transaction = 2;
3799
3800         if (auth_data->algorithm == WLAN_AUTH_SAE) {
3801                 trans = auth_data->sae_trans;
3802                 status = auth_data->sae_status;
3803                 auth_data->expected_transaction = trans;
3804         }
3805
3806         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3807                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3808                            IEEE80211_TX_INTFL_MLME_CONN_TX;
3809
3810         ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3811                             auth_data->data, auth_data->data_len,
3812                             auth_data->bss->bssid,
3813                             auth_data->bss->bssid, NULL, 0, 0,
3814                             tx_flags);
3815
3816         if (tx_flags == 0) {
3817                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3818                 auth_data->timeout_started = true;
3819                 run_again(sdata, auth_data->timeout);
3820         } else {
3821                 auth_data->timeout =
3822                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3823                 auth_data->timeout_started = true;
3824                 run_again(sdata, auth_data->timeout);
3825         }
3826
3827         return 0;
3828 }
3829
3830 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3831 {
3832         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3833         struct ieee80211_local *local = sdata->local;
3834
3835         sdata_assert_lock(sdata);
3836
3837         assoc_data->tries++;
3838         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3839                 sdata_info(sdata, "association with %pM timed out\n",
3840                            assoc_data->bss->bssid);
3841
3842                 /*
3843                  * Most likely AP is not in the range so remove the
3844                  * bss struct for that AP.
3845                  */
3846                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3847
3848                 return -ETIMEDOUT;
3849         }
3850
3851         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3852                    assoc_data->bss->bssid, assoc_data->tries,
3853                    IEEE80211_ASSOC_MAX_TRIES);
3854         ieee80211_send_assoc(sdata);
3855
3856         if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3857                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3858                 assoc_data->timeout_started = true;
3859                 run_again(sdata, assoc_data->timeout);
3860         } else {
3861                 assoc_data->timeout =
3862                         round_jiffies_up(jiffies +
3863                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3864                 assoc_data->timeout_started = true;
3865                 run_again(sdata, assoc_data->timeout);
3866         }
3867
3868         return 0;
3869 }
3870
3871 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3872                                   __le16 fc, bool acked)
3873 {
3874         struct ieee80211_local *local = sdata->local;
3875
3876         sdata->u.mgd.status_fc = fc;
3877         sdata->u.mgd.status_acked = acked;
3878         sdata->u.mgd.status_received = true;
3879
3880         ieee80211_queue_work(&local->hw, &sdata->work);
3881 }
3882
3883 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3884 {
3885         struct ieee80211_local *local = sdata->local;
3886         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3887
3888         sdata_lock(sdata);
3889
3890         if (ifmgd->status_received) {
3891                 __le16 fc = ifmgd->status_fc;
3892                 bool status_acked = ifmgd->status_acked;
3893
3894                 ifmgd->status_received = false;
3895                 if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3896                         if (status_acked) {
3897                                 ifmgd->auth_data->timeout =
3898                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3899                                 run_again(sdata, ifmgd->auth_data->timeout);
3900                         } else {
3901                                 ifmgd->auth_data->timeout = jiffies - 1;
3902                         }
3903                         ifmgd->auth_data->timeout_started = true;
3904                 } else if (ifmgd->assoc_data &&
3905                            (ieee80211_is_assoc_req(fc) ||
3906                             ieee80211_is_reassoc_req(fc))) {
3907                         if (status_acked) {
3908                                 ifmgd->assoc_data->timeout =
3909                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3910                                 run_again(sdata, ifmgd->assoc_data->timeout);
3911                         } else {
3912                                 ifmgd->assoc_data->timeout = jiffies - 1;
3913                         }
3914                         ifmgd->assoc_data->timeout_started = true;
3915                 }
3916         }
3917
3918         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3919             time_after(jiffies, ifmgd->auth_data->timeout)) {
3920                 if (ifmgd->auth_data->done) {
3921                         /*
3922                          * ok ... we waited for assoc but userspace didn't,
3923                          * so let's just kill the auth data
3924                          */
3925                         ieee80211_destroy_auth_data(sdata, false);
3926                 } else if (ieee80211_auth(sdata)) {
3927                         u8 bssid[ETH_ALEN];
3928                         struct ieee80211_event event = {
3929                                 .type = MLME_EVENT,
3930                                 .u.mlme.data = AUTH_EVENT,
3931                                 .u.mlme.status = MLME_TIMEOUT,
3932                         };
3933
3934                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3935
3936                         ieee80211_destroy_auth_data(sdata, false);
3937
3938                         cfg80211_auth_timeout(sdata->dev, bssid);
3939                         drv_event_callback(sdata->local, sdata, &event);
3940                 }
3941         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3942                 run_again(sdata, ifmgd->auth_data->timeout);
3943
3944         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3945             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3946                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3947                     ieee80211_do_assoc(sdata)) {
3948                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3949                         struct ieee80211_event event = {
3950                                 .type = MLME_EVENT,
3951                                 .u.mlme.data = ASSOC_EVENT,
3952                                 .u.mlme.status = MLME_TIMEOUT,
3953                         };
3954
3955                         ieee80211_destroy_assoc_data(sdata, false, false);
3956                         cfg80211_assoc_timeout(sdata->dev, bss);
3957                         drv_event_callback(sdata->local, sdata, &event);
3958                 }
3959         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3960                 run_again(sdata, ifmgd->assoc_data->timeout);
3961
3962         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3963             ifmgd->associated) {
3964                 u8 bssid[ETH_ALEN];
3965                 int max_tries;
3966
3967                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3968
3969                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3970                         max_tries = max_nullfunc_tries;
3971                 else
3972                         max_tries = max_probe_tries;
3973
3974                 /* ACK received for nullfunc probing frame */
3975                 if (!ifmgd->probe_send_count)
3976                         ieee80211_reset_ap_probe(sdata);
3977                 else if (ifmgd->nullfunc_failed) {
3978                         if (ifmgd->probe_send_count < max_tries) {
3979                                 mlme_dbg(sdata,
3980                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3981                                          bssid, ifmgd->probe_send_count,
3982                                          max_tries);
3983                                 ieee80211_mgd_probe_ap_send(sdata);
3984                         } else {
3985                                 mlme_dbg(sdata,
3986                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3987                                          bssid);
3988                                 ieee80211_sta_connection_lost(sdata, bssid,
3989                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3990                                         false);
3991                         }
3992                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3993                         run_again(sdata, ifmgd->probe_timeout);
3994                 else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3995                         mlme_dbg(sdata,
3996                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3997                                  bssid, probe_wait_ms);
3998                         ieee80211_sta_connection_lost(sdata, bssid,
3999                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4000                 } else if (ifmgd->probe_send_count < max_tries) {
4001                         mlme_dbg(sdata,
4002                                  "No probe response from AP %pM after %dms, try %d/%i\n",
4003                                  bssid, probe_wait_ms,
4004                                  ifmgd->probe_send_count, max_tries);
4005                         ieee80211_mgd_probe_ap_send(sdata);
4006                 } else {
4007                         /*
4008                          * We actually lost the connection ... or did we?
4009                          * Let's make sure!
4010                          */
4011                         wiphy_debug(local->hw.wiphy,
4012                                     "%s: No probe response from AP %pM"
4013                                     " after %dms, disconnecting.\n",
4014                                     sdata->name,
4015                                     bssid, probe_wait_ms);
4016
4017                         ieee80211_sta_connection_lost(sdata, bssid,
4018                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
4019                 }
4020         }
4021
4022         sdata_unlock(sdata);
4023 }
4024
4025 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
4026 {
4027         struct ieee80211_sub_if_data *sdata =
4028                 (struct ieee80211_sub_if_data *) data;
4029         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4030
4031         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4032                 return;
4033
4034         sdata->u.mgd.connection_loss = false;
4035         ieee80211_queue_work(&sdata->local->hw,
4036                              &sdata->u.mgd.beacon_connection_loss_work);
4037 }
4038
4039 static void ieee80211_sta_conn_mon_timer(unsigned long data)
4040 {
4041         struct ieee80211_sub_if_data *sdata =
4042                 (struct ieee80211_sub_if_data *) data;
4043         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4044         struct ieee80211_local *local = sdata->local;
4045
4046         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
4047                 return;
4048
4049         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
4050 }
4051
4052 static void ieee80211_sta_monitor_work(struct work_struct *work)
4053 {
4054         struct ieee80211_sub_if_data *sdata =
4055                 container_of(work, struct ieee80211_sub_if_data,
4056                              u.mgd.monitor_work);
4057
4058         ieee80211_mgd_probe_ap(sdata, false);
4059 }
4060
4061 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
4062 {
4063         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4064                 __ieee80211_stop_poll(sdata);
4065
4066                 /* let's probe the connection once */
4067                 if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4068                         ieee80211_queue_work(&sdata->local->hw,
4069                                              &sdata->u.mgd.monitor_work);
4070         }
4071 }
4072
4073 #ifdef CONFIG_PM
4074 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
4075 {
4076         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4077         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4078
4079         sdata_lock(sdata);
4080
4081         if (ifmgd->auth_data || ifmgd->assoc_data) {
4082                 const u8 *bssid = ifmgd->auth_data ?
4083                                 ifmgd->auth_data->bss->bssid :
4084                                 ifmgd->assoc_data->bss->bssid;
4085
4086                 /*
4087                  * If we are trying to authenticate / associate while suspending,
4088                  * cfg80211 won't know and won't actually abort those attempts,
4089                  * thus we need to do that ourselves.
4090                  */
4091                 ieee80211_send_deauth_disassoc(sdata, bssid,
4092                                                IEEE80211_STYPE_DEAUTH,
4093                                                WLAN_REASON_DEAUTH_LEAVING,
4094                                                false, frame_buf);
4095                 if (ifmgd->assoc_data)
4096                         ieee80211_destroy_assoc_data(sdata, false, true);
4097                 if (ifmgd->auth_data)
4098                         ieee80211_destroy_auth_data(sdata, false);
4099                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4100                                       IEEE80211_DEAUTH_FRAME_LEN);
4101         }
4102
4103         /* This is a bit of a hack - we should find a better and more generic
4104          * solution to this. Normally when suspending, cfg80211 will in fact
4105          * deauthenticate. However, it doesn't (and cannot) stop an ongoing
4106          * auth (not so important) or assoc (this is the problem) process.
4107          *
4108          * As a consequence, it can happen that we are in the process of both
4109          * associating and suspending, and receive an association response
4110          * after cfg80211 has checked if it needs to disconnect, but before
4111          * we actually set the flag to drop incoming frames. This will then
4112          * cause the workqueue flush to process the association response in
4113          * the suspend, resulting in a successful association just before it
4114          * tries to remove the interface from the driver, which now though
4115          * has a channel context assigned ... this results in issues.
4116          *
4117          * To work around this (for now) simply deauth here again if we're
4118          * now connected.
4119          */
4120         if (ifmgd->associated && !sdata->local->wowlan) {
4121                 u8 bssid[ETH_ALEN];
4122                 struct cfg80211_deauth_request req = {
4123                         .reason_code = WLAN_REASON_DEAUTH_LEAVING,
4124                         .bssid = bssid,
4125                 };
4126
4127                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
4128                 ieee80211_mgd_deauth(sdata, &req);
4129         }
4130
4131         sdata_unlock(sdata);
4132 }
4133
4134 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
4135 {
4136         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4137
4138         sdata_lock(sdata);
4139         if (!ifmgd->associated) {
4140                 sdata_unlock(sdata);
4141                 return;
4142         }
4143
4144         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
4145                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
4146                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
4147                 ieee80211_sta_connection_lost(sdata,
4148                                               ifmgd->associated->bssid,
4149                                               WLAN_REASON_UNSPECIFIED,
4150                                               true);
4151                 sdata_unlock(sdata);
4152                 return;
4153         }
4154         sdata_unlock(sdata);
4155 }
4156 #endif
4157
4158 /* interface setup */
4159 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4160 {
4161         struct ieee80211_if_managed *ifmgd;
4162
4163         ifmgd = &sdata->u.mgd;
4164         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4165         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4166         INIT_WORK(&ifmgd->beacon_connection_loss_work,
4167                   ieee80211_beacon_connection_loss_work);
4168         INIT_WORK(&ifmgd->csa_connection_drop_work,
4169                   ieee80211_csa_connection_drop_work);
4170         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4171         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4172                           ieee80211_tdls_peer_del_work);
4173         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4174                     (unsigned long) sdata);
4175         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4176                     (unsigned long) sdata);
4177         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4178                     (unsigned long) sdata);
4179         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4180                     (unsigned long) sdata);
4181         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4182                           ieee80211_sta_handle_tspec_ac_params_wk);
4183
4184         ifmgd->flags = 0;
4185         ifmgd->powersave = sdata->wdev.ps;
4186         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4187         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4188         ifmgd->p2p_noa_index = -1;
4189
4190         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4191                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4192         else
4193                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4194
4195         /* Setup TDLS data */
4196         spin_lock_init(&ifmgd->teardown_lock);
4197         ifmgd->teardown_skb = NULL;
4198         ifmgd->orig_teardown_skb = NULL;
4199 }
4200
4201 /* scan finished notification */
4202 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4203 {
4204         struct ieee80211_sub_if_data *sdata;
4205
4206         /* Restart STA timers */
4207         rcu_read_lock();
4208         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4209                 if (ieee80211_sdata_running(sdata))
4210                         ieee80211_restart_sta_timer(sdata);
4211         }
4212         rcu_read_unlock();
4213 }
4214
4215 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4216                                      struct cfg80211_bss *cbss)
4217 {
4218         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4219         const u8 *ht_cap_ie, *vht_cap_ie;
4220         const struct ieee80211_ht_cap *ht_cap;
4221         const struct ieee80211_vht_cap *vht_cap;
4222         u8 chains = 1;
4223
4224         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4225                 return chains;
4226
4227         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4228         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4229                 ht_cap = (void *)(ht_cap_ie + 2);
4230                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4231                 /*
4232                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4233                  *       "Tx Unequal Modulation Supported" fields.
4234                  */
4235         }
4236
4237         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4238                 return chains;
4239
4240         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4241         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4242                 u8 nss;
4243                 u16 tx_mcs_map;
4244
4245                 vht_cap = (void *)(vht_cap_ie + 2);
4246                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4247                 for (nss = 8; nss > 0; nss--) {
4248                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4249                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4250                                 break;
4251                 }
4252                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4253                 chains = max(chains, nss);
4254         }
4255
4256         return chains;
4257 }
4258
4259 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4260                                   struct cfg80211_bss *cbss)
4261 {
4262         struct ieee80211_local *local = sdata->local;
4263         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4264         const struct ieee80211_ht_cap *ht_cap = NULL;
4265         const struct ieee80211_ht_operation *ht_oper = NULL;
4266         const struct ieee80211_vht_operation *vht_oper = NULL;
4267         struct ieee80211_supported_band *sband;
4268         struct cfg80211_chan_def chandef;
4269         int ret;
4270         u32 i;
4271         bool have_80mhz;
4272
4273         sband = local->hw.wiphy->bands[cbss->channel->band];
4274
4275         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4276                           IEEE80211_STA_DISABLE_80P80MHZ |
4277                           IEEE80211_STA_DISABLE_160MHZ);
4278
4279         rcu_read_lock();
4280
4281         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4282             sband->ht_cap.ht_supported) {
4283                 const u8 *ht_oper_ie, *ht_cap_ie;
4284
4285                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4286                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4287                         ht_oper = (void *)(ht_oper_ie + 2);
4288
4289                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4290                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4291                         ht_cap = (void *)(ht_cap_ie + 2);
4292
4293                 if (!ht_cap) {
4294                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4295                         ht_oper = NULL;
4296                 }
4297         }
4298
4299         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4300             sband->vht_cap.vht_supported) {
4301                 const u8 *vht_oper_ie, *vht_cap;
4302
4303                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4304                                                    WLAN_EID_VHT_OPERATION);
4305                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4306                         vht_oper = (void *)(vht_oper_ie + 2);
4307                 if (vht_oper && !ht_oper) {
4308                         vht_oper = NULL;
4309                         sdata_info(sdata,
4310                                    "AP advertised VHT without HT, disabling both\n");
4311                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4312                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4313                 }
4314
4315                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4316                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4317                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4318                         vht_oper = NULL;
4319                 }
4320         }
4321
4322         /* Allow VHT if at least one channel on the sband supports 80 MHz */
4323         have_80mhz = false;
4324         for (i = 0; i < sband->n_channels; i++) {
4325                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
4326                                                 IEEE80211_CHAN_NO_80MHZ))
4327                         continue;
4328
4329                 have_80mhz = true;
4330                 break;
4331         }
4332
4333         if (!have_80mhz)
4334                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4335
4336         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4337                                                      cbss->channel,
4338                                                      ht_cap, ht_oper, vht_oper,
4339                                                      &chandef, false);
4340
4341         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4342                                       local->rx_chains);
4343
4344         rcu_read_unlock();
4345
4346         /* will change later if needed */
4347         sdata->smps_mode = IEEE80211_SMPS_OFF;
4348
4349         mutex_lock(&local->mtx);
4350         /*
4351          * If this fails (possibly due to channel context sharing
4352          * on incompatible channels, e.g. 80+80 and 160 sharing the
4353          * same control channel) try to use a smaller bandwidth.
4354          */
4355         ret = ieee80211_vif_use_channel(sdata, &chandef,
4356                                         IEEE80211_CHANCTX_SHARED);
4357
4358         /* don't downgrade for 5 and 10 MHz channels, though. */
4359         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4360             chandef.width == NL80211_CHAN_WIDTH_10)
4361                 goto out;
4362
4363         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4364                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4365                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4366                                                 IEEE80211_CHANCTX_SHARED);
4367         }
4368  out:
4369         mutex_unlock(&local->mtx);
4370         return ret;
4371 }
4372
4373 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4374                                      struct cfg80211_bss *cbss, bool assoc,
4375                                      bool override)
4376 {
4377         struct ieee80211_local *local = sdata->local;
4378         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4379         struct ieee80211_bss *bss = (void *)cbss->priv;
4380         struct sta_info *new_sta = NULL;
4381         struct ieee80211_supported_band *sband;
4382         bool have_sta = false;
4383         int err;
4384
4385         sband = local->hw.wiphy->bands[cbss->channel->band];
4386
4387         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4388                 return -EINVAL;
4389
4390         /* If a reconfig is happening, bail out */
4391         if (local->in_reconfig)
4392                 return -EBUSY;
4393
4394         if (assoc) {
4395                 rcu_read_lock();
4396                 have_sta = sta_info_get(sdata, cbss->bssid);
4397                 rcu_read_unlock();
4398         }
4399
4400         if (!have_sta) {
4401                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4402                 if (!new_sta)
4403                         return -ENOMEM;
4404         }
4405
4406         if (new_sta || override) {
4407                 err = ieee80211_prep_channel(sdata, cbss);
4408                 if (err) {
4409                         if (new_sta)
4410                                 sta_info_free(local, new_sta);
4411                         return -EINVAL;
4412                 }
4413         }
4414
4415         if (new_sta) {
4416                 u32 rates = 0, basic_rates = 0;
4417                 bool have_higher_than_11mbit;
4418                 int min_rate = INT_MAX, min_rate_index = -1;
4419                 struct ieee80211_chanctx_conf *chanctx_conf;
4420                 const struct cfg80211_bss_ies *ies;
4421                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4422                 u32 rate_flags;
4423
4424                 rcu_read_lock();
4425                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4426                 if (WARN_ON(!chanctx_conf)) {
4427                         rcu_read_unlock();
4428                         sta_info_free(local, new_sta);
4429                         return -EINVAL;
4430                 }
4431                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4432                 rcu_read_unlock();
4433
4434                 ieee80211_get_rates(sband, bss->supp_rates,
4435                                     bss->supp_rates_len,
4436                                     &rates, &basic_rates,
4437                                     &have_higher_than_11mbit,
4438                                     &min_rate, &min_rate_index,
4439                                     shift, rate_flags);
4440
4441                 /*
4442                  * This used to be a workaround for basic rates missing
4443                  * in the association response frame. Now that we no
4444                  * longer use the basic rates from there, it probably
4445                  * doesn't happen any more, but keep the workaround so
4446                  * in case some *other* APs are buggy in different ways
4447                  * we can connect -- with a warning.
4448                  */
4449                 if (!basic_rates && min_rate_index >= 0) {
4450                         sdata_info(sdata,
4451                                    "No basic rates, using min rate instead\n");
4452                         basic_rates = BIT(min_rate_index);
4453                 }
4454
4455                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4456                 sdata->vif.bss_conf.basic_rates = basic_rates;
4457
4458                 /* cf. IEEE 802.11 9.2.12 */
4459                 if (cbss->channel->band == NL80211_BAND_2GHZ &&
4460                     have_higher_than_11mbit)
4461                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4462                 else
4463                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4464
4465                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4466
4467                 /* set timing information */
4468                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4469                 rcu_read_lock();
4470                 ies = rcu_dereference(cbss->beacon_ies);
4471                 if (ies) {
4472                         const u8 *tim_ie;
4473
4474                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4475                         sdata->vif.bss_conf.sync_device_ts =
4476                                 bss->device_ts_beacon;
4477                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4478                                                   ies->data, ies->len);
4479                         if (tim_ie && tim_ie[1] >= 2)
4480                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4481                         else
4482                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4483                 } else if (!ieee80211_hw_check(&sdata->local->hw,
4484                                                TIMING_BEACON_ONLY)) {
4485                         ies = rcu_dereference(cbss->proberesp_ies);
4486                         /* must be non-NULL since beacon IEs were NULL */
4487                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4488                         sdata->vif.bss_conf.sync_device_ts =
4489                                 bss->device_ts_presp;
4490                         sdata->vif.bss_conf.sync_dtim_count = 0;
4491                 } else {
4492                         sdata->vif.bss_conf.sync_tsf = 0;
4493                         sdata->vif.bss_conf.sync_device_ts = 0;
4494                         sdata->vif.bss_conf.sync_dtim_count = 0;
4495                 }
4496                 rcu_read_unlock();
4497
4498                 /* tell driver about BSSID, basic rates and timing */
4499                 ieee80211_bss_info_change_notify(sdata,
4500                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4501                         BSS_CHANGED_BEACON_INT);
4502
4503                 if (assoc)
4504                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4505
4506                 err = sta_info_insert(new_sta);
4507                 new_sta = NULL;
4508                 if (err) {
4509                         sdata_info(sdata,
4510                                    "failed to insert STA entry for the AP (error %d)\n",
4511                                    err);
4512                         return err;
4513                 }
4514         } else
4515                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4516
4517         /* Cancel scan to ensure that nothing interferes with connection */
4518         if (local->scanning)
4519                 ieee80211_scan_cancel(local);
4520
4521         return 0;
4522 }
4523
4524 /* config hooks */
4525 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4526                        struct cfg80211_auth_request *req)
4527 {
4528         struct ieee80211_local *local = sdata->local;
4529         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4530         struct ieee80211_mgd_auth_data *auth_data;
4531         u16 auth_alg;
4532         int err;
4533
4534         /* prepare auth data structure */
4535
4536         switch (req->auth_type) {
4537         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4538                 auth_alg = WLAN_AUTH_OPEN;
4539                 break;
4540         case NL80211_AUTHTYPE_SHARED_KEY:
4541                 if (IS_ERR(local->wep_tx_tfm))
4542                         return -EOPNOTSUPP;
4543                 auth_alg = WLAN_AUTH_SHARED_KEY;
4544                 break;
4545         case NL80211_AUTHTYPE_FT:
4546                 auth_alg = WLAN_AUTH_FT;
4547                 break;
4548         case NL80211_AUTHTYPE_NETWORK_EAP:
4549                 auth_alg = WLAN_AUTH_LEAP;
4550                 break;
4551         case NL80211_AUTHTYPE_SAE:
4552                 auth_alg = WLAN_AUTH_SAE;
4553                 break;
4554         default:
4555                 return -EOPNOTSUPP;
4556         }
4557
4558         auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4559                             req->ie_len, GFP_KERNEL);
4560         if (!auth_data)
4561                 return -ENOMEM;
4562
4563         auth_data->bss = req->bss;
4564
4565         if (req->auth_data_len >= 4) {
4566                 __le16 *pos = (__le16 *) req->auth_data;
4567                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4568                 auth_data->sae_status = le16_to_cpu(pos[1]);
4569                 memcpy(auth_data->data, req->auth_data + 4,
4570                        req->auth_data_len - 4);
4571                 auth_data->data_len += req->auth_data_len - 4;
4572         }
4573
4574         if (req->ie && req->ie_len) {
4575                 memcpy(&auth_data->data[auth_data->data_len],
4576                        req->ie, req->ie_len);
4577                 auth_data->data_len += req->ie_len;
4578         }
4579
4580         if (req->key && req->key_len) {
4581                 auth_data->key_len = req->key_len;
4582                 auth_data->key_idx = req->key_idx;
4583                 memcpy(auth_data->key, req->key, req->key_len);
4584         }
4585
4586         auth_data->algorithm = auth_alg;
4587
4588         /* try to authenticate/probe */
4589
4590         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4591             ifmgd->assoc_data) {
4592                 err = -EBUSY;
4593                 goto err_free;
4594         }
4595
4596         if (ifmgd->auth_data)
4597                 ieee80211_destroy_auth_data(sdata, false);
4598
4599         /* prep auth_data so we don't go into idle on disassoc */
4600         ifmgd->auth_data = auth_data;
4601
4602         if (ifmgd->associated) {
4603                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4604
4605                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4606                                        WLAN_REASON_UNSPECIFIED,
4607                                        false, frame_buf);
4608
4609                 ieee80211_report_disconnect(sdata, frame_buf,
4610                                             sizeof(frame_buf), true,
4611                                             WLAN_REASON_UNSPECIFIED);
4612         }
4613
4614         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4615
4616         err = ieee80211_prep_connection(sdata, req->bss, false, false);
4617         if (err)
4618                 goto err_clear;
4619
4620         err = ieee80211_auth(sdata);
4621         if (err) {
4622                 sta_info_destroy_addr(sdata, req->bss->bssid);
4623                 goto err_clear;
4624         }
4625
4626         /* hold our own reference */
4627         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4628         return 0;
4629
4630  err_clear:
4631         eth_zero_addr(ifmgd->bssid);
4632         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4633         ifmgd->auth_data = NULL;
4634         mutex_lock(&sdata->local->mtx);
4635         ieee80211_vif_release_channel(sdata);
4636         mutex_unlock(&sdata->local->mtx);
4637  err_free:
4638         kfree(auth_data);
4639         return err;
4640 }
4641
4642 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4643                         struct cfg80211_assoc_request *req)
4644 {
4645         struct ieee80211_local *local = sdata->local;
4646         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4647         struct ieee80211_bss *bss = (void *)req->bss->priv;
4648         struct ieee80211_mgd_assoc_data *assoc_data;
4649         const struct cfg80211_bss_ies *beacon_ies;
4650         struct ieee80211_supported_band *sband;
4651         const u8 *ssidie, *ht_ie, *vht_ie;
4652         int i, err;
4653         bool override = false;
4654
4655         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4656         if (!assoc_data)
4657                 return -ENOMEM;
4658
4659         rcu_read_lock();
4660         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4661         if (!ssidie) {
4662                 rcu_read_unlock();
4663                 kfree(assoc_data);
4664                 return -EINVAL;
4665         }
4666         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4667         assoc_data->ssid_len = ssidie[1];
4668         rcu_read_unlock();
4669
4670         if (ifmgd->associated) {
4671                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4672
4673                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4674                                        WLAN_REASON_UNSPECIFIED,
4675                                        false, frame_buf);
4676
4677                 ieee80211_report_disconnect(sdata, frame_buf,
4678                                             sizeof(frame_buf), true,
4679                                             WLAN_REASON_UNSPECIFIED);
4680         }
4681
4682         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4683                 err = -EBUSY;
4684                 goto err_free;
4685         }
4686
4687         if (ifmgd->assoc_data) {
4688                 err = -EBUSY;
4689                 goto err_free;
4690         }
4691
4692         if (ifmgd->auth_data) {
4693                 bool match;
4694
4695                 /* keep sta info, bssid if matching */
4696                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4697                 ieee80211_destroy_auth_data(sdata, match);
4698         }
4699
4700         /* prepare assoc data */
4701
4702         ifmgd->beacon_crc_valid = false;
4703
4704         assoc_data->wmm = bss->wmm_used &&
4705                           (local->hw.queues >= IEEE80211_NUM_ACS);
4706
4707         /*
4708          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4709          * We still associate in non-HT mode (11a/b/g) if any one of these
4710          * ciphers is configured as pairwise.
4711          * We can set this to true for non-11n hardware, that'll be checked
4712          * separately along with the peer capabilities.
4713          */
4714         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4715                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4716                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4717                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4718                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4719                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4720                         netdev_info(sdata->dev,
4721                                     "disabling HT/VHT due to WEP/TKIP use\n");
4722                 }
4723         }
4724
4725         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4726         sband = local->hw.wiphy->bands[req->bss->channel->band];
4727         if (!sband->ht_cap.ht_supported ||
4728             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4729             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4730                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4731                 if (!bss->wmm_used &&
4732                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4733                         netdev_info(sdata->dev,
4734                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4735         }
4736
4737         /* disable VHT if we don't support it or the AP doesn't use WMM */
4738         if (!sband->vht_cap.vht_supported ||
4739             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4740             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4741                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4742                 if (!bss->wmm_used &&
4743                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4744                         netdev_info(sdata->dev,
4745                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4746         }
4747
4748         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4749         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4750                sizeof(ifmgd->ht_capa_mask));
4751
4752         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4753         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4754                sizeof(ifmgd->vht_capa_mask));
4755
4756         if (req->ie && req->ie_len) {
4757                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4758                 assoc_data->ie_len = req->ie_len;
4759         }
4760
4761         assoc_data->bss = req->bss;
4762
4763         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4764                 if (ifmgd->powersave)
4765                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4766                 else
4767                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4768         } else
4769                 sdata->smps_mode = ifmgd->req_smps;
4770
4771         assoc_data->capability = req->bss->capability;
4772         assoc_data->supp_rates = bss->supp_rates;
4773         assoc_data->supp_rates_len = bss->supp_rates_len;
4774
4775         rcu_read_lock();
4776         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4777         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4778                 assoc_data->ap_ht_param =
4779                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4780         else
4781                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4782         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4783         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4784                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4785                        sizeof(struct ieee80211_vht_cap));
4786         else
4787                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4788         rcu_read_unlock();
4789
4790         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4791                  ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4792              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4793                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4794
4795         if (bss->wmm_used && bss->uapsd_supported &&
4796             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4797                 assoc_data->uapsd = true;
4798                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4799         } else {
4800                 assoc_data->uapsd = false;
4801                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4802         }
4803
4804         if (req->prev_bssid)
4805                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4806
4807         if (req->use_mfp) {
4808                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4809                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4810         } else {
4811                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4812                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4813         }
4814
4815         if (req->flags & ASSOC_REQ_USE_RRM)
4816                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4817         else
4818                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4819
4820         if (req->crypto.control_port)
4821                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4822         else
4823                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4824
4825         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4826         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4827         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4828                                                         sdata->vif.type);
4829
4830         /* kick off associate process */
4831
4832         ifmgd->assoc_data = assoc_data;
4833         ifmgd->dtim_period = 0;
4834         ifmgd->have_beacon = false;
4835
4836         /* override HT/VHT configuration only if the AP and we support it */
4837         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
4838                 struct ieee80211_sta_ht_cap sta_ht_cap;
4839
4840                 if (req->flags & ASSOC_REQ_DISABLE_HT)
4841                         override = true;
4842
4843                 memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4844                 ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4845
4846                 /* check for 40 MHz disable override */
4847                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
4848                     sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
4849                     !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
4850                         override = true;
4851
4852                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4853                     req->flags & ASSOC_REQ_DISABLE_VHT)
4854                         override = true;
4855         }
4856
4857         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4858                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4859                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4860         }
4861
4862         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4863                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4864
4865         err = ieee80211_prep_connection(sdata, req->bss, true, override);
4866         if (err)
4867                 goto err_clear;
4868
4869         rcu_read_lock();
4870         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4871
4872         if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4873             !beacon_ies) {
4874                 /*
4875                  * Wait up to one beacon interval ...
4876                  * should this be more if we miss one?
4877                  */
4878                 sdata_info(sdata, "waiting for beacon from %pM\n",
4879                            ifmgd->bssid);
4880                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4881                 assoc_data->timeout_started = true;
4882                 assoc_data->need_beacon = true;
4883         } else if (beacon_ies) {
4884                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4885                                                     beacon_ies->data,
4886                                                     beacon_ies->len);
4887                 u8 dtim_count = 0;
4888
4889                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4890                         const struct ieee80211_tim_ie *tim;
4891                         tim = (void *)(tim_ie + 2);
4892                         ifmgd->dtim_period = tim->dtim_period;
4893                         dtim_count = tim->dtim_count;
4894                 }
4895                 ifmgd->have_beacon = true;
4896                 assoc_data->timeout = jiffies;
4897                 assoc_data->timeout_started = true;
4898
4899                 if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4900                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4901                         sdata->vif.bss_conf.sync_device_ts =
4902                                 bss->device_ts_beacon;
4903                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4904                 }
4905         } else {
4906                 assoc_data->timeout = jiffies;
4907                 assoc_data->timeout_started = true;
4908         }
4909         rcu_read_unlock();
4910
4911         run_again(sdata, assoc_data->timeout);
4912
4913         if (bss->corrupt_data) {
4914                 char *corrupt_type = "data";
4915                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4916                         if (bss->corrupt_data &
4917                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4918                                 corrupt_type = "beacon and probe response";
4919                         else
4920                                 corrupt_type = "beacon";
4921                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4922                         corrupt_type = "probe response";
4923                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4924                            corrupt_type);
4925         }
4926
4927         return 0;
4928  err_clear:
4929         eth_zero_addr(ifmgd->bssid);
4930         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4931         ifmgd->assoc_data = NULL;
4932  err_free:
4933         kfree(assoc_data);
4934         return err;
4935 }
4936
4937 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4938                          struct cfg80211_deauth_request *req)
4939 {
4940         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4941         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4942         bool tx = !req->local_state_change;
4943
4944         if (ifmgd->auth_data &&
4945             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4946                 sdata_info(sdata,
4947                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4948                            req->bssid, req->reason_code,
4949                            ieee80211_get_reason_code_string(req->reason_code));
4950
4951                 drv_mgd_prepare_tx(sdata->local, sdata);
4952                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4953                                                IEEE80211_STYPE_DEAUTH,
4954                                                req->reason_code, tx,
4955                                                frame_buf);
4956                 ieee80211_destroy_auth_data(sdata, false);
4957                 ieee80211_report_disconnect(sdata, frame_buf,
4958                                             sizeof(frame_buf), true,
4959                                             req->reason_code);
4960
4961                 return 0;
4962         }
4963
4964         if (ifmgd->assoc_data &&
4965             ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
4966                 sdata_info(sdata,
4967                            "aborting association with %pM by local choice (Reason: %u=%s)\n",
4968                            req->bssid, req->reason_code,
4969                            ieee80211_get_reason_code_string(req->reason_code));
4970
4971                 drv_mgd_prepare_tx(sdata->local, sdata);
4972                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4973                                                IEEE80211_STYPE_DEAUTH,
4974                                                req->reason_code, tx,
4975                                                frame_buf);
4976                 ieee80211_destroy_assoc_data(sdata, false, true);
4977                 ieee80211_report_disconnect(sdata, frame_buf,
4978                                             sizeof(frame_buf), true,
4979                                             req->reason_code);
4980                 return 0;
4981         }
4982
4983         if (ifmgd->associated &&
4984             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4985                 sdata_info(sdata,
4986                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4987                            req->bssid, req->reason_code,
4988                            ieee80211_get_reason_code_string(req->reason_code));
4989
4990                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4991                                        req->reason_code, tx, frame_buf);
4992                 ieee80211_report_disconnect(sdata, frame_buf,
4993                                             sizeof(frame_buf), true,
4994                                             req->reason_code);
4995                 return 0;
4996         }
4997
4998         return -ENOTCONN;
4999 }
5000
5001 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5002                            struct cfg80211_disassoc_request *req)
5003 {
5004         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5005         u8 bssid[ETH_ALEN];
5006         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
5007
5008         /*
5009          * cfg80211 should catch this ... but it's racy since
5010          * we can receive a disassoc frame, process it, hand it
5011          * to cfg80211 while that's in a locked section already
5012          * trying to tell us that the user wants to disconnect.
5013          */
5014         if (ifmgd->associated != req->bss)
5015                 return -ENOLINK;
5016
5017         sdata_info(sdata,
5018                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
5019                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5020
5021         memcpy(bssid, req->bss->bssid, ETH_ALEN);
5022         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
5023                                req->reason_code, !req->local_state_change,
5024                                frame_buf);
5025
5026         ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
5027                                     req->reason_code);
5028
5029         return 0;
5030 }
5031
5032 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5033 {
5034         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5035
5036         /*
5037          * Make sure some work items will not run after this,
5038          * they will not do anything but might not have been
5039          * cancelled when disconnecting.
5040          */
5041         cancel_work_sync(&ifmgd->monitor_work);
5042         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
5043         cancel_work_sync(&ifmgd->request_smps_work);
5044         cancel_work_sync(&ifmgd->csa_connection_drop_work);
5045         cancel_work_sync(&ifmgd->chswitch_work);
5046         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5047
5048         sdata_lock(sdata);
5049         if (ifmgd->assoc_data) {
5050                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5051                 ieee80211_destroy_assoc_data(sdata, false, false);
5052                 cfg80211_assoc_timeout(sdata->dev, bss);
5053         }
5054         if (ifmgd->auth_data)
5055                 ieee80211_destroy_auth_data(sdata, false);
5056         spin_lock_bh(&ifmgd->teardown_lock);
5057         if (ifmgd->teardown_skb) {
5058                 kfree_skb(ifmgd->teardown_skb);
5059                 ifmgd->teardown_skb = NULL;
5060                 ifmgd->orig_teardown_skb = NULL;
5061         }
5062         spin_unlock_bh(&ifmgd->teardown_lock);
5063         del_timer_sync(&ifmgd->timer);
5064         sdata_unlock(sdata);
5065 }
5066
5067 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
5068                                enum nl80211_cqm_rssi_threshold_event rssi_event,
5069                                gfp_t gfp)
5070 {
5071         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5072
5073         trace_api_cqm_rssi_notify(sdata, rssi_event);
5074
5075         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
5076 }
5077 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5078
5079 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
5080 {
5081         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5082
5083         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
5084
5085         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
5086 }
5087 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);