net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  34 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  35 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  36 #define IEEE80211_AUTH_MAX_TRIES        3
  37 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  38 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  39 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  40 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  41 #define IEEE80211_ASSOC_MAX_TRIES       3
  42
  43 static int max_nullfunc_tries = 2;
  44 module_param(max_nullfunc_tries, int, 0644);
  45 MODULE_PARM_DESC(max_nullfunc_tries,
  46                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  47
  48 static int max_probe_tries = 5;
  49 module_param(max_probe_tries, int, 0644);
  50 MODULE_PARM_DESC(max_probe_tries,
  51                  "Maximum probe tries before disconnecting (reason 4).");
  52
  53 /*
  54  * Beacon loss timeout is calculated as N frames times the
  55  * advertised beacon interval.  This may need to be somewhat
  56  * higher than what hardware might detect to account for
  57  * delays in the host processing frames. But since we also
  58  * probe on beacon miss before declaring the connection lost
  59  * default to what we want.
  60  */
  61 static int beacon_loss_count = 7;
  62 module_param(beacon_loss_count, int, 0644);
  63 MODULE_PARM_DESC(beacon_loss_count,
  64                  "Number of beacon intervals before we decide beacon was lost.");
  65
  66 /*
  67  * Time the connection can be idle before we probe
  68  * it to see if we can still talk to the AP.
  69  */
  70 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  71 /*
  72  * Time we wait for a probe response after sending
  73  * a probe request because of beacon loss or for
  74  * checking the connection still works.
  75  */
  76 static int probe_wait_ms = 500;
  77 module_param(probe_wait_ms, int, 0644);
  78 MODULE_PARM_DESC(probe_wait_ms,
  79                  "Maximum time(ms) to wait for probe response"
  80                  " before disconnecting (reason 4).");
  81
  82 /*
  83  * Weight given to the latest Beacon frame when calculating average signal
  84  * strength for Beacon frames received in the current BSS. This must be
  85  * between 1 and 15.
  86  */
  87 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  88
  89 /*
  90  * How many Beacon frames need to have been used in average signal strength
  91  * before starting to indicate signal change events.
  92  */
  93 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  94
  95 /*
  96  * We can have multiple work items (and connection probing)
  97  * scheduling this timer, but we need to take care to only
  98  * reschedule it when it should fire _earlier_ than it was
  99  * asked for before, or if it's not pending right now. This
 100  * function ensures that. Note that it then is required to
 101  * run this function for all timeouts after the first one
 102  * has happened -- the work that runs from this timer will
 103  * do that.
 104  */
 105 static void run_again(struct ieee80211_sub_if_data *sdata,
 106                       unsigned long timeout)
 107 {
 108         sdata_assert_lock(sdata);
 109
 110         if (!timer_pending(&sdata->u.mgd.timer) ||
 111             time_before(timeout, sdata->u.mgd.timer.expires))
 112                 mod_timer(&sdata->u.mgd.timer, timeout);
 113 }
 114
 115 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 116 {
 117         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 118                 return;
 119
 120         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 121                 return;
 122
 123         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 124                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 125 }
 126
 127 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 128 {
 129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 130
 131         if (unlikely(!sdata->u.mgd.associated))
 132                 return;
 133
 134         ifmgd->probe_send_count = 0;
 135
 136         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 137                 return;
 138
 139         mod_timer(&sdata->u.mgd.conn_mon_timer,
 140                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 141 }
 142
 143 static int ecw2cw(int ecw)
 144 {
 145         return (1 << ecw) - 1;
 146 }
 147
 148 static u32
 149 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 150                              struct ieee80211_supported_band *sband,
 151                              struct ieee80211_channel *channel,
 152                              const struct ieee80211_ht_operation *ht_oper,
 153                              const struct ieee80211_vht_operation *vht_oper,
 154                              struct cfg80211_chan_def *chandef, bool tracking)
 155 {
 156         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 157         struct cfg80211_chan_def vht_chandef;
 158         u32 ht_cfreq, ret;
 159
 160         chandef->chan = channel;
 161         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 162         chandef->center_freq1 = channel->center_freq;
 163         chandef->center_freq2 = 0;
 164
 165         if (!ht_oper || !sband->ht_cap.ht_supported) {
 166                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 167                 goto out;
 168         }
 169
 170         chandef->width = NL80211_CHAN_WIDTH_20;
 171
 172         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 173                                                   channel->band);
 174         /* check that channel matches the right operating channel */
 175         if (!tracking && channel->center_freq != ht_cfreq) {
 176                 /*
 177                  * It's possible that some APs are confused here;
 178                  * Netgear WNDR3700 sometimes reports 4 higher than
 179                  * the actual channel in association responses, but
 180                  * since we look at probe response/beacon data here
 181                  * it should be OK.
 182                  */
 183                 sdata_info(sdata,
 184                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 185                            channel->center_freq, ht_cfreq,
 186                            ht_oper->primary_chan, channel->band);
 187                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 188                 goto out;
 189         }
 190
 191         /* check 40 MHz support, if we have it */
 192         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 193                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 194                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 195                         chandef->width = NL80211_CHAN_WIDTH_40;
 196                         chandef->center_freq1 += 10;
 197                         break;
 198                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 199                         chandef->width = NL80211_CHAN_WIDTH_40;
 200                         chandef->center_freq1 -= 10;
 201                         break;
 202                 }
 203         } else {
 204                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 205                 ret = IEEE80211_STA_DISABLE_VHT;
 206                 /* also mark 40 MHz disabled */
 207                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 208                 goto out;
 209         }
 210
 211         if (!vht_oper || !sband->vht_cap.vht_supported) {
 212                 ret = IEEE80211_STA_DISABLE_VHT;
 213                 goto out;
 214         }
 215
 216         vht_chandef.chan = channel;
 217         vht_chandef.center_freq1 =
 218                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 219                                                channel->band);
 220         vht_chandef.center_freq2 = 0;
 221
 222         switch (vht_oper->chan_width) {
 223         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 224                 vht_chandef.width = chandef->width;
 225                 vht_chandef.center_freq1 = chandef->center_freq1;
 226                 break;
 227         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 228                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 229                 break;
 230         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 231                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 232                 break;
 233         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 234                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 235                 vht_chandef.center_freq2 =
 236                         ieee80211_channel_to_frequency(
 237                                 vht_oper->center_freq_seg2_idx,
 238                                 channel->band);
 239                 break;
 240         default:
 241                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 242                         sdata_info(sdata,
 243                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 244                                    vht_oper->chan_width);
 245                 ret = IEEE80211_STA_DISABLE_VHT;
 246                 goto out;
 247         }
 248
 249         if (!cfg80211_chandef_valid(&vht_chandef)) {
 250                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 251                         sdata_info(sdata,
 252                                    "AP VHT information is invalid, disable VHT\n");
 253                 ret = IEEE80211_STA_DISABLE_VHT;
 254                 goto out;
 255         }
 256
 257         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 258                 ret = 0;
 259                 goto out;
 260         }
 261
 262         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 263                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 264                         sdata_info(sdata,
 265                                    "AP VHT information doesn't match HT, disable VHT\n");
 266                 ret = IEEE80211_STA_DISABLE_VHT;
 267                 goto out;
 268         }
 269
 270         *chandef = vht_chandef;
 271
 272         ret = 0;
 273
 274 out:
 275         /*
 276          * When tracking the current AP, don't do any further checks if the
 277          * new chandef is identical to the one we're currently using for the
 278          * connection. This keeps us from playing ping-pong with regulatory,
 279          * without it the following can happen (for example):
 280          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 281          *  - AP advertises regdom US
 282          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 283          *  - the code below detects an unsupported channel, downgrades, and
 284          *    we disconnect from the AP in the caller
 285          *  - disconnect causes CRDA to reload world regdomain and the game
 286          *    starts anew.
 287          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 288          *
 289          * It seems possible that there are still scenarios with CSA or real
 290          * bandwidth changes where a this could happen, but those cases are
 291          * less common and wouldn't completely prevent using the AP.
 292          */
 293         if (tracking &&
 294             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 295                 return ret;
 296
 297         /* don't print the message below for VHT mismatch if VHT is disabled */
 298         if (ret & IEEE80211_STA_DISABLE_VHT)
 299                 vht_chandef = *chandef;
 300
 301         /*
 302          * Ignore the DISABLED flag when we're already connected and only
 303          * tracking the APs beacon for bandwidth changes - otherwise we
 304          * might get disconnected here if we connect to an AP, update our
 305          * regulatory information based on the AP's country IE and the
 306          * information we have is wrong/outdated and disables the channel
 307          * that we're actually using for the connection to the AP.
 308          */
 309         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 310                                         tracking ? 0 :
 311                                                    IEEE80211_CHAN_DISABLED)) {
 312                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 313                         ret = IEEE80211_STA_DISABLE_HT |
 314                               IEEE80211_STA_DISABLE_VHT;
 315                         break;
 316                 }
 317
 318                 ret |= ieee80211_chandef_downgrade(chandef);
 319         }
 320
 321         if (chandef->width != vht_chandef.width && !tracking)
 322                 sdata_info(sdata,
 323                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 324
 325         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 326         return ret;
 327 }
 328
 329 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 330                                struct sta_info *sta,
 331                                const struct ieee80211_ht_operation *ht_oper,
 332                                const struct ieee80211_vht_operation *vht_oper,
 333                                const u8 *bssid, u32 *changed)
 334 {
 335         struct ieee80211_local *local = sdata->local;
 336         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 337         struct ieee80211_supported_band *sband;
 338         struct ieee80211_channel *chan;
 339         struct cfg80211_chan_def chandef;
 340         u16 ht_opmode;
 341         u32 flags;
 342         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 343         int ret;
 344
 345         /* if HT was/is disabled, don't track any bandwidth changes */
 346         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 347                 return 0;
 348
 349         /* don't check VHT if we associated as non-VHT station */
 350         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 351                 vht_oper = NULL;
 352
 353         if (WARN_ON_ONCE(!sta))
 354                 return -EINVAL;
 355
 356         /*
 357          * if bss configuration changed store the new one -
 358          * this may be applicable even if channel is identical
 359          */
 360         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 361         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 362                 *changed |= BSS_CHANGED_HT;
 363                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 364         }
 365
 366         chan = sdata->vif.bss_conf.chandef.chan;
 367         sband = local->hw.wiphy->bands[chan->band];
 368
 369         /* calculate new channel (type) based on HT/VHT operation IEs */
 370         flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
 371                                              vht_oper, &chandef, true);
 372
 373         /*
 374          * Downgrade the new channel if we associated with restricted
 375          * capabilities. For example, if we associated as a 20 MHz STA
 376          * to a 40 MHz AP (due to regulatory, capabilities or config
 377          * reasons) then switching to a 40 MHz channel now won't do us
 378          * any good -- we couldn't use it with the AP.
 379          */
 380         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 381             chandef.width == NL80211_CHAN_WIDTH_80P80)
 382                 flags |= ieee80211_chandef_downgrade(&chandef);
 383         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 384             chandef.width == NL80211_CHAN_WIDTH_160)
 385                 flags |= ieee80211_chandef_downgrade(&chandef);
 386         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 387             chandef.width > NL80211_CHAN_WIDTH_20)
 388                 flags |= ieee80211_chandef_downgrade(&chandef);
 389
 390         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 391                 return 0;
 392
 393         sdata_info(sdata,
 394                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 395                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 396                    chandef.center_freq1, chandef.center_freq2);
 397
 398         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 399                                       IEEE80211_STA_DISABLE_VHT |
 400                                       IEEE80211_STA_DISABLE_40MHZ |
 401                                       IEEE80211_STA_DISABLE_80P80MHZ |
 402                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 403             !cfg80211_chandef_valid(&chandef)) {
 404                 sdata_info(sdata,
 405                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 406                            ifmgd->bssid);
 407                 return -EINVAL;
 408         }
 409
 410         switch (chandef.width) {
 411         case NL80211_CHAN_WIDTH_20_NOHT:
 412         case NL80211_CHAN_WIDTH_20:
 413                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 414                 break;
 415         case NL80211_CHAN_WIDTH_40:
 416                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 417                 break;
 418         case NL80211_CHAN_WIDTH_80:
 419                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 420                 break;
 421         case NL80211_CHAN_WIDTH_80P80:
 422         case NL80211_CHAN_WIDTH_160:
 423                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 424                 break;
 425         default:
 426                 return -EINVAL;
 427         }
 428
 429         if (new_sta_bw > sta->cur_max_bandwidth)
 430                 new_sta_bw = sta->cur_max_bandwidth;
 431
 432         if (new_sta_bw < sta->sta.bandwidth) {
 433                 sta->sta.bandwidth = new_sta_bw;
 434                 rate_control_rate_update(local, sband, sta,
 435                                          IEEE80211_RC_BW_CHANGED);
 436         }
 437
 438         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 439         if (ret) {
 440                 sdata_info(sdata,
 441                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 442                            ifmgd->bssid);
 443                 return ret;
 444         }
 445
 446         if (new_sta_bw > sta->sta.bandwidth) {
 447                 sta->sta.bandwidth = new_sta_bw;
 448                 rate_control_rate_update(local, sband, sta,
 449                                          IEEE80211_RC_BW_CHANGED);
 450         }
 451
 452         return 0;
 453 }
 454
 455 /* frame sending functions */
 456
 457 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 458                                 struct sk_buff *skb, u8 ap_ht_param,
 459                                 struct ieee80211_supported_band *sband,
 460                                 struct ieee80211_channel *channel,
 461                                 enum ieee80211_smps_mode smps)
 462 {
 463         u8 *pos;
 464         u32 flags = channel->flags;
 465         u16 cap;
 466         struct ieee80211_sta_ht_cap ht_cap;
 467
 468         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 469
 470         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 471         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 472
 473         /* determine capability flags */
 474         cap = ht_cap.cap;
 475
 476         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 477         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 478                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 479                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 480                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 481                 }
 482                 break;
 483         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 484                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 485                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 486                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 487                 }
 488                 break;
 489         }
 490
 491         /*
 492          * If 40 MHz was disabled associate as though we weren't
 493          * capable of 40 MHz -- some broken APs will never fall
 494          * back to trying to transmit in 20 MHz.
 495          */
 496         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 497                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 498                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 499         }
 500
 501         /* set SM PS mode properly */
 502         cap &= ~IEEE80211_HT_CAP_SM_PS;
 503         switch (smps) {
 504         case IEEE80211_SMPS_AUTOMATIC:
 505         case IEEE80211_SMPS_NUM_MODES:
 506                 WARN_ON(1);
 507         case IEEE80211_SMPS_OFF:
 508                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 509                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 510                 break;
 511         case IEEE80211_SMPS_STATIC:
 512                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 513                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 514                 break;
 515         case IEEE80211_SMPS_DYNAMIC:
 516                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 517                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 518                 break;
 519         }
 520
 521         /* reserve and fill IE */
 522         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 523         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 524 }
 525
 526 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 527                                  struct sk_buff *skb,
 528                                  struct ieee80211_supported_band *sband,
 529                                  struct ieee80211_vht_cap *ap_vht_cap)
 530 {
 531         u8 *pos;
 532         u32 cap;
 533         struct ieee80211_sta_vht_cap vht_cap;
 534         u32 mask, ap_bf_sts, our_bf_sts;
 535
 536         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 537
 538         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 539         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 540
 541         /* determine capability flags */
 542         cap = vht_cap.cap;
 543
 544         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 545                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 546                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 547         }
 548
 549         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 550                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 551                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 552         }
 553
 554         /*
 555          * Some APs apparently get confused if our capabilities are better
 556          * than theirs, so restrict what we advertise in the assoc request.
 557          */
 558         if (!(ap_vht_cap->vht_cap_info &
 559                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 560                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 561
 562         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 563
 564         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 565         our_bf_sts = cap & mask;
 566
 567         if (ap_bf_sts < our_bf_sts) {
 568                 cap &= ~mask;
 569                 cap |= ap_bf_sts;
 570         }
 571
 572         /* reserve and fill IE */
 573         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 574         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 575 }
 576
 577 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 578 {
 579         struct ieee80211_local *local = sdata->local;
 580         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 581         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 582         struct sk_buff *skb;
 583         struct ieee80211_mgmt *mgmt;
 584         u8 *pos, qos_info;
 585         size_t offset = 0, noffset;
 586         int i, count, rates_len, supp_rates_len, shift;
 587         u16 capab;
 588         struct ieee80211_supported_band *sband;
 589         struct ieee80211_chanctx_conf *chanctx_conf;
 590         struct ieee80211_channel *chan;
 591         u32 rate_flags, rates = 0;
 592
 593         sdata_assert_lock(sdata);
 594
 595         rcu_read_lock();
 596         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 597         if (WARN_ON(!chanctx_conf)) {
 598                 rcu_read_unlock();
 599                 return;
 600         }
 601         chan = chanctx_conf->def.chan;
 602         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 603         rcu_read_unlock();
 604         sband = local->hw.wiphy->bands[chan->band];
 605         shift = ieee80211_vif_get_shift(&sdata->vif);
 606
 607         if (assoc_data->supp_rates_len) {
 608                 /*
 609                  * Get all rates supported by the device and the AP as
 610                  * some APs don't like getting a superset of their rates
 611                  * in the association request (e.g. D-Link DAP 1353 in
 612                  * b-only mode)...
 613                  */
 614                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 615                                                      assoc_data->supp_rates,
 616                                                      assoc_data->supp_rates_len,
 617                                                      &rates);
 618         } else {
 619                 /*
 620                  * In case AP not provide any supported rates information
 621                  * before association, we send information element(s) with
 622                  * all rates that we support.
 623                  */
 624                 rates_len = 0;
 625                 for (i = 0; i < sband->n_bitrates; i++) {
 626                         if ((rate_flags & sband->bitrates[i].flags)
 627                             != rate_flags)
 628                                 continue;
 629                         rates |= BIT(i);
 630                         rates_len++;
 631                 }
 632         }
 633
 634         skb = alloc_skb(local->hw.extra_tx_headroom +
 635                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 636                         2 + assoc_data->ssid_len + /* SSID */
 637                         4 + rates_len + /* (extended) rates */
 638                         4 + /* power capability */
 639                         2 + 2 * sband->n_channels + /* supported channels */
 640                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 641                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 642                         assoc_data->ie_len + /* extra IEs */
 643                         9, /* WMM */
 644                         GFP_KERNEL);
 645         if (!skb)
 646                 return;
 647
 648         skb_reserve(skb, local->hw.extra_tx_headroom);
 649
 650         capab = WLAN_CAPABILITY_ESS;
 651
 652         if (sband->band == IEEE80211_BAND_2GHZ) {
 653                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 654                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 655                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 656                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 657         }
 658
 659         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 660                 capab |= WLAN_CAPABILITY_PRIVACY;
 661
 662         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 663             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 664                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 665
 666         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 667         memset(mgmt, 0, 24);
 668         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 669         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 670         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 671
 672         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 673                 skb_put(skb, 10);
 674                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 675                                                   IEEE80211_STYPE_REASSOC_REQ);
 676                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 677                 mgmt->u.reassoc_req.listen_interval =
 678                                 cpu_to_le16(local->hw.conf.listen_interval);
 679                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 680                        ETH_ALEN);
 681         } else {
 682                 skb_put(skb, 4);
 683                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 684                                                   IEEE80211_STYPE_ASSOC_REQ);
 685                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 686                 mgmt->u.assoc_req.listen_interval =
 687                                 cpu_to_le16(local->hw.conf.listen_interval);
 688         }
 689
 690         /* SSID */
 691         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 692         *pos++ = WLAN_EID_SSID;
 693         *pos++ = assoc_data->ssid_len;
 694         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 695
 696         /* add all rates which were marked to be used above */
 697         supp_rates_len = rates_len;
 698         if (supp_rates_len > 8)
 699                 supp_rates_len = 8;
 700
 701         pos = skb_put(skb, supp_rates_len + 2);
 702         *pos++ = WLAN_EID_SUPP_RATES;
 703         *pos++ = supp_rates_len;
 704
 705         count = 0;
 706         for (i = 0; i < sband->n_bitrates; i++) {
 707                 if (BIT(i) & rates) {
 708                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 709                                                 5 * (1 << shift));
 710                         *pos++ = (u8) rate;
 711                         if (++count == 8)
 712                                 break;
 713                 }
 714         }
 715
 716         if (rates_len > count) {
 717                 pos = skb_put(skb, rates_len - count + 2);
 718                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 719                 *pos++ = rates_len - count;
 720
 721                 for (i++; i < sband->n_bitrates; i++) {
 722                         if (BIT(i) & rates) {
 723                                 int rate;
 724                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 725                                                     5 * (1 << shift));
 726                                 *pos++ = (u8) rate;
 727                         }
 728                 }
 729         }
 730
 731         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 732                 /* 1. power capabilities */
 733                 pos = skb_put(skb, 4);
 734                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 735                 *pos++ = 2;
 736                 *pos++ = 0; /* min tx power */
 737                  /* max tx power */
 738                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 739
 740                 /* 2. supported channels */
 741                 /* TODO: get this in reg domain format */
 742                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 743                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 744                 *pos++ = 2 * sband->n_channels;
 745                 for (i = 0; i < sband->n_channels; i++) {
 746                         *pos++ = ieee80211_frequency_to_channel(
 747                                         sband->channels[i].center_freq);
 748                         *pos++ = 1; /* one channel in the subband*/
 749                 }
 750         }
 751
 752         /* if present, add any custom IEs that go before HT */
 753         if (assoc_data->ie_len) {
 754                 static const u8 before_ht[] = {
 755                         WLAN_EID_SSID,
 756                         WLAN_EID_SUPP_RATES,
 757                         WLAN_EID_EXT_SUPP_RATES,
 758                         WLAN_EID_PWR_CAPABILITY,
 759                         WLAN_EID_SUPPORTED_CHANNELS,
 760                         WLAN_EID_RSN,
 761                         WLAN_EID_QOS_CAPA,
 762                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 763                         WLAN_EID_MOBILITY_DOMAIN,
 764                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 765                 };
 766                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 767                                              before_ht, ARRAY_SIZE(before_ht),
 768                                              offset);
 769                 pos = skb_put(skb, noffset - offset);
 770                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 771                 offset = noffset;
 772         }
 773
 774         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 775                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 776                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 777
 778         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 779                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 780                                     sband, chan, sdata->smps_mode);
 781
 782         /* if present, add any custom IEs that go before VHT */
 783         if (assoc_data->ie_len) {
 784                 static const u8 before_vht[] = {
 785                         WLAN_EID_SSID,
 786                         WLAN_EID_SUPP_RATES,
 787                         WLAN_EID_EXT_SUPP_RATES,
 788                         WLAN_EID_PWR_CAPABILITY,
 789                         WLAN_EID_SUPPORTED_CHANNELS,
 790                         WLAN_EID_RSN,
 791                         WLAN_EID_QOS_CAPA,
 792                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 793                         WLAN_EID_MOBILITY_DOMAIN,
 794                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 795                         WLAN_EID_HT_CAPABILITY,
 796                         WLAN_EID_BSS_COEX_2040,
 797                         WLAN_EID_EXT_CAPABILITY,
 798                         WLAN_EID_QOS_TRAFFIC_CAPA,
 799                         WLAN_EID_TIM_BCAST_REQ,
 800                         WLAN_EID_INTERWORKING,
 801                 };
 802                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 803                                              before_vht, ARRAY_SIZE(before_vht),
 804                                              offset);
 805                 pos = skb_put(skb, noffset - offset);
 806                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 807                 offset = noffset;
 808         }
 809
 810         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 811                 ieee80211_add_vht_ie(sdata, skb, sband,
 812                                      &assoc_data->ap_vht_cap);
 813
 814         /* if present, add any custom non-vendor IEs that go after HT */
 815         if (assoc_data->ie_len) {
 816                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 817                                                     assoc_data->ie_len,
 818                                                     offset);
 819                 pos = skb_put(skb, noffset - offset);
 820                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 821                 offset = noffset;
 822         }
 823
 824         if (assoc_data->wmm) {
 825                 if (assoc_data->uapsd) {
 826                         qos_info = ifmgd->uapsd_queues;
 827                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 828                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 829                 } else {
 830                         qos_info = 0;
 831                 }
 832
 833                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 834         }
 835
 836         /* add any remaining custom (i.e. vendor specific here) IEs */
 837         if (assoc_data->ie_len) {
 838                 noffset = assoc_data->ie_len;
 839                 pos = skb_put(skb, noffset - offset);
 840                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 841         }
 842
 843         drv_mgd_prepare_tx(local, sdata);
 844
 845         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 846         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 847                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 848                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 849         ieee80211_tx_skb(sdata, skb);
 850 }
 851
 852 void ieee80211_send_pspoll(struct ieee80211_local *local,
 853                            struct ieee80211_sub_if_data *sdata)
 854 {
 855         struct ieee80211_pspoll *pspoll;
 856         struct sk_buff *skb;
 857
 858         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 859         if (!skb)
 860                 return;
 861
 862         pspoll = (struct ieee80211_pspoll *) skb->data;
 863         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 864
 865         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 866         ieee80211_tx_skb(sdata, skb);
 867 }
 868
 869 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 870                              struct ieee80211_sub_if_data *sdata,
 871                              int powersave)
 872 {
 873         struct sk_buff *skb;
 874         struct ieee80211_hdr_3addr *nullfunc;
 875         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 876
 877         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 878         if (!skb)
 879                 return;
 880
 881         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 882         if (powersave)
 883                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 884
 885         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 886                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 887
 888         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 889                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 890
 891         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 892                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 893
 894         ieee80211_tx_skb(sdata, skb);
 895 }
 896
 897 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 898                                           struct ieee80211_sub_if_data *sdata)
 899 {
 900         struct sk_buff *skb;
 901         struct ieee80211_hdr *nullfunc;
 902         __le16 fc;
 903
 904         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 905                 return;
 906
 907         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 908         if (!skb)
 909                 return;
 910
 911         skb_reserve(skb, local->hw.extra_tx_headroom);
 912
 913         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 914         memset(nullfunc, 0, 30);
 915         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 916                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 917         nullfunc->frame_control = fc;
 918         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 919         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 920         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 921         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 922
 923         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 924         ieee80211_tx_skb(sdata, skb);
 925 }
 926
 927 /* spectrum management related things */
 928 static void ieee80211_chswitch_work(struct work_struct *work)
 929 {
 930         struct ieee80211_sub_if_data *sdata =
 931                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 932         struct ieee80211_local *local = sdata->local;
 933         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 934         int ret;
 935
 936         if (!ieee80211_sdata_running(sdata))
 937                 return;
 938
 939         sdata_lock(sdata);
 940         mutex_lock(&local->mtx);
 941         mutex_lock(&local->chanctx_mtx);
 942
 943         if (!ifmgd->associated)
 944                 goto out;
 945
 946         if (!sdata->vif.csa_active)
 947                 goto out;
 948
 949         /*
 950          * using reservation isn't immediate as it may be deferred until later
 951          * with multi-vif. once reservation is complete it will re-schedule the
 952          * work with no reserved_chanctx so verify chandef to check if it
 953          * completed successfully
 954          */
 955
 956         if (sdata->reserved_chanctx) {
 957                 /*
 958                  * with multi-vif csa driver may call ieee80211_csa_finish()
 959                  * many times while waiting for other interfaces to use their
 960                  * reservations
 961                  */
 962                 if (sdata->reserved_ready)
 963                         goto out;
 964
 965                 ret = ieee80211_vif_use_reserved_context(sdata);
 966                 if (ret) {
 967                         sdata_info(sdata,
 968                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
 969                                    ret);
 970                         ieee80211_queue_work(&sdata->local->hw,
 971                                              &ifmgd->csa_connection_drop_work);
 972                         goto out;
 973                 }
 974
 975                 goto out;
 976         }
 977
 978         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
 979                                         &sdata->csa_chandef)) {
 980                 sdata_info(sdata,
 981                            "failed to finalize channel switch, disconnecting\n");
 982                 ieee80211_queue_work(&sdata->local->hw,
 983                                      &ifmgd->csa_connection_drop_work);
 984                 goto out;
 985         }
 986
 987         /* XXX: shouldn't really modify cfg80211-owned data! */
 988         ifmgd->associated->channel = sdata->csa_chandef.chan;
 989
 990         sdata->vif.csa_active = false;
 991
 992         /* XXX: wait for a beacon first? */
 993         if (sdata->csa_block_tx) {
 994                 ieee80211_wake_vif_queues(local, sdata,
 995                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 996                 sdata->csa_block_tx = false;
 997         }
 998
 999         ieee80211_sta_reset_beacon_monitor(sdata);
1000         ieee80211_sta_reset_conn_monitor(sdata);
1001
1002 out:
1003         mutex_unlock(&local->chanctx_mtx);
1004         mutex_unlock(&local->mtx);
1005         sdata_unlock(sdata);
1006 }
1007
1008 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1009 {
1010         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1011         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1012
1013         trace_api_chswitch_done(sdata, success);
1014         if (!success) {
1015                 sdata_info(sdata,
1016                            "driver channel switch failed, disconnecting\n");
1017                 ieee80211_queue_work(&sdata->local->hw,
1018                                      &ifmgd->csa_connection_drop_work);
1019         } else {
1020                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1021         }
1022 }
1023 EXPORT_SYMBOL(ieee80211_chswitch_done);
1024
1025 static void ieee80211_chswitch_timer(unsigned long data)
1026 {
1027         struct ieee80211_sub_if_data *sdata =
1028                 (struct ieee80211_sub_if_data *) data;
1029
1030         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1031 }
1032
1033 static void
1034 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1035                                  u64 timestamp, struct ieee802_11_elems *elems,
1036                                  bool beacon)
1037 {
1038         struct ieee80211_local *local = sdata->local;
1039         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1040         struct cfg80211_bss *cbss = ifmgd->associated;
1041         struct ieee80211_chanctx_conf *conf;
1042         struct ieee80211_chanctx *chanctx;
1043         enum ieee80211_band current_band;
1044         struct ieee80211_csa_ie csa_ie;
1045         int res;
1046
1047         sdata_assert_lock(sdata);
1048
1049         if (!cbss)
1050                 return;
1051
1052         if (local->scanning)
1053                 return;
1054
1055         /* disregard subsequent announcements if we are already processing */
1056         if (sdata->vif.csa_active)
1057                 return;
1058
1059         current_band = cbss->channel->band;
1060         memset(&csa_ie, 0, sizeof(csa_ie));
1061         res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
1062                                            ifmgd->flags,
1063                                            ifmgd->associated->bssid, &csa_ie);
1064         if (res < 0)
1065                 ieee80211_queue_work(&local->hw,
1066                                      &ifmgd->csa_connection_drop_work);
1067         if (res)
1068                 return;
1069
1070         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1071                                      IEEE80211_CHAN_DISABLED)) {
1072                 sdata_info(sdata,
1073                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1074                            ifmgd->associated->bssid,
1075                            csa_ie.chandef.chan->center_freq,
1076                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1077                            csa_ie.chandef.center_freq2);
1078                 ieee80211_queue_work(&local->hw,
1079                                      &ifmgd->csa_connection_drop_work);
1080                 return;
1081         }
1082
1083         mutex_lock(&local->mtx);
1084         mutex_lock(&local->chanctx_mtx);
1085         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1086                                          lockdep_is_held(&local->chanctx_mtx));
1087         if (!conf) {
1088                 sdata_info(sdata,
1089                            "no channel context assigned to vif?, disconnecting\n");
1090                 ieee80211_queue_work(&local->hw,
1091                                      &ifmgd->csa_connection_drop_work);
1092                 mutex_unlock(&local->chanctx_mtx);
1093                 mutex_unlock(&local->mtx);
1094                 return;
1095         }
1096
1097         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1098
1099         if (local->use_chanctx) {
1100                 u32 num_chanctx = 0;
1101                 list_for_each_entry(chanctx, &local->chanctx_list, list)
1102                        num_chanctx++;
1103
1104                 if (num_chanctx > 1 ||
1105                     !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1106                         sdata_info(sdata,
1107                                    "not handling chan-switch with channel contexts\n");
1108                         ieee80211_queue_work(&local->hw,
1109                                              &ifmgd->csa_connection_drop_work);
1110                         mutex_unlock(&local->chanctx_mtx);
1111                         mutex_unlock(&local->mtx);
1112                         return;
1113                 }
1114         }
1115
1116         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1117                                             chanctx->mode, false);
1118         if (res) {
1119                 sdata_info(sdata,
1120                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1121                            res);
1122                 ieee80211_queue_work(&local->hw,
1123                                      &ifmgd->csa_connection_drop_work);
1124                 mutex_unlock(&local->chanctx_mtx);
1125                 mutex_unlock(&local->mtx);
1126                 return;
1127         }
1128         mutex_unlock(&local->chanctx_mtx);
1129
1130         sdata->vif.csa_active = true;
1131         sdata->csa_chandef = csa_ie.chandef;
1132         sdata->csa_block_tx = csa_ie.mode;
1133
1134         if (sdata->csa_block_tx)
1135                 ieee80211_stop_vif_queues(local, sdata,
1136                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1137         mutex_unlock(&local->mtx);
1138
1139         if (local->ops->channel_switch) {
1140                 /* use driver's channel switch callback */
1141                 struct ieee80211_channel_switch ch_switch = {
1142                         .timestamp = timestamp,
1143                         .block_tx = csa_ie.mode,
1144                         .chandef = csa_ie.chandef,
1145                         .count = csa_ie.count,
1146                 };
1147
1148                 drv_channel_switch(local, &ch_switch);
1149                 return;
1150         }
1151
1152         /* channel switch handled in software */
1153         if (csa_ie.count <= 1)
1154                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1155         else
1156                 mod_timer(&ifmgd->chswitch_timer,
1157                           TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1158 }
1159
1160 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1161                                        struct ieee80211_channel *channel,
1162                                        const u8 *country_ie, u8 country_ie_len,
1163                                        const u8 *pwr_constr_elem)
1164 {
1165         struct ieee80211_country_ie_triplet *triplet;
1166         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1167         int i, chan_pwr, chan_increment, new_ap_level;
1168         bool have_chan_pwr = false;
1169
1170         /* Invalid IE */
1171         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1172                 return 0;
1173
1174         triplet = (void *)(country_ie + 3);
1175         country_ie_len -= 3;
1176
1177         switch (channel->band) {
1178         default:
1179                 WARN_ON_ONCE(1);
1180                 /* fall through */
1181         case IEEE80211_BAND_2GHZ:
1182         case IEEE80211_BAND_60GHZ:
1183                 chan_increment = 1;
1184                 break;
1185         case IEEE80211_BAND_5GHZ:
1186                 chan_increment = 4;
1187                 break;
1188         }
1189
1190         /* find channel */
1191         while (country_ie_len >= 3) {
1192                 u8 first_channel = triplet->chans.first_channel;
1193
1194                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1195                         goto next;
1196
1197                 for (i = 0; i < triplet->chans.num_channels; i++) {
1198                         if (first_channel + i * chan_increment == chan) {
1199                                 have_chan_pwr = true;
1200                                 chan_pwr = triplet->chans.max_power;
1201                                 break;
1202                         }
1203                 }
1204                 if (have_chan_pwr)
1205                         break;
1206
1207  next:
1208                 triplet++;
1209                 country_ie_len -= 3;
1210         }
1211
1212         if (!have_chan_pwr)
1213                 return 0;
1214
1215         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1216
1217         if (sdata->ap_power_level == new_ap_level)
1218                 return 0;
1219
1220         sdata_info(sdata,
1221                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1222                    new_ap_level, chan_pwr, *pwr_constr_elem,
1223                    sdata->u.mgd.bssid);
1224         sdata->ap_power_level = new_ap_level;
1225         if (__ieee80211_recalc_txpower(sdata))
1226                 return BSS_CHANGED_TXPOWER;
1227         return 0;
1228 }
1229
1230 /* powersave */
1231 static void ieee80211_enable_ps(struct ieee80211_local *local,
1232                                 struct ieee80211_sub_if_data *sdata)
1233 {
1234         struct ieee80211_conf *conf = &local->hw.conf;
1235
1236         /*
1237          * If we are scanning right now then the parameters will
1238          * take effect when scan finishes.
1239          */
1240         if (local->scanning)
1241                 return;
1242
1243         if (conf->dynamic_ps_timeout > 0 &&
1244             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1245                 mod_timer(&local->dynamic_ps_timer, jiffies +
1246                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1247         } else {
1248                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1249                         ieee80211_send_nullfunc(local, sdata, 1);
1250
1251                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1252                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1253                         return;
1254
1255                 conf->flags |= IEEE80211_CONF_PS;
1256                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1257         }
1258 }
1259
1260 static void ieee80211_change_ps(struct ieee80211_local *local)
1261 {
1262         struct ieee80211_conf *conf = &local->hw.conf;
1263
1264         if (local->ps_sdata) {
1265                 ieee80211_enable_ps(local, local->ps_sdata);
1266         } else if (conf->flags & IEEE80211_CONF_PS) {
1267                 conf->flags &= ~IEEE80211_CONF_PS;
1268                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1269                 del_timer_sync(&local->dynamic_ps_timer);
1270                 cancel_work_sync(&local->dynamic_ps_enable_work);
1271         }
1272 }
1273
1274 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1275 {
1276         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1277         struct sta_info *sta = NULL;
1278         bool authorized = false;
1279
1280         if (!mgd->powersave)
1281                 return false;
1282
1283         if (mgd->broken_ap)
1284                 return false;
1285
1286         if (!mgd->associated)
1287                 return false;
1288
1289         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1290                 return false;
1291
1292         if (!mgd->have_beacon)
1293                 return false;
1294
1295         rcu_read_lock();
1296         sta = sta_info_get(sdata, mgd->bssid);
1297         if (sta)
1298                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1299         rcu_read_unlock();
1300
1301         return authorized;
1302 }
1303
1304 /* need to hold RTNL or interface lock */
1305 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1306 {
1307         struct ieee80211_sub_if_data *sdata, *found = NULL;
1308         int count = 0;
1309         int timeout;
1310
1311         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1312                 local->ps_sdata = NULL;
1313                 return;
1314         }
1315
1316         list_for_each_entry(sdata, &local->interfaces, list) {
1317                 if (!ieee80211_sdata_running(sdata))
1318                         continue;
1319                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1320                         /* If an AP vif is found, then disable PS
1321                          * by setting the count to zero thereby setting
1322                          * ps_sdata to NULL.
1323                          */
1324                         count = 0;
1325                         break;
1326                 }
1327                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1328                         continue;
1329                 found = sdata;
1330                 count++;
1331         }
1332
1333         if (count == 1 && ieee80211_powersave_allowed(found)) {
1334                 s32 beaconint_us;
1335
1336                 if (latency < 0)
1337                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1338
1339                 beaconint_us = ieee80211_tu_to_usec(
1340                                         found->vif.bss_conf.beacon_int);
1341
1342                 timeout = local->dynamic_ps_forced_timeout;
1343                 if (timeout < 0) {
1344                         /*
1345                          * Go to full PSM if the user configures a very low
1346                          * latency requirement.
1347                          * The 2000 second value is there for compatibility
1348                          * until the PM_QOS_NETWORK_LATENCY is configured
1349                          * with real values.
1350                          */
1351                         if (latency > (1900 * USEC_PER_MSEC) &&
1352                             latency != (2000 * USEC_PER_SEC))
1353                                 timeout = 0;
1354                         else
1355                                 timeout = 100;
1356                 }
1357                 local->hw.conf.dynamic_ps_timeout = timeout;
1358
1359                 if (beaconint_us > latency) {
1360                         local->ps_sdata = NULL;
1361                 } else {
1362                         int maxslp = 1;
1363                         u8 dtimper = found->u.mgd.dtim_period;
1364
1365                         /* If the TIM IE is invalid, pretend the value is 1 */
1366                         if (!dtimper)
1367                                 dtimper = 1;
1368                         else if (dtimper > 1)
1369                                 maxslp = min_t(int, dtimper,
1370                                                     latency / beaconint_us);
1371
1372                         local->hw.conf.max_sleep_period = maxslp;
1373                         local->hw.conf.ps_dtim_period = dtimper;
1374                         local->ps_sdata = found;
1375                 }
1376         } else {
1377                 local->ps_sdata = NULL;
1378         }
1379
1380         ieee80211_change_ps(local);
1381 }
1382
1383 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1384 {
1385         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1386
1387         if (sdata->vif.bss_conf.ps != ps_allowed) {
1388                 sdata->vif.bss_conf.ps = ps_allowed;
1389                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1390         }
1391 }
1392
1393 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1394 {
1395         struct ieee80211_local *local =
1396                 container_of(work, struct ieee80211_local,
1397                              dynamic_ps_disable_work);
1398
1399         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1400                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1401                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1402         }
1403
1404         ieee80211_wake_queues_by_reason(&local->hw,
1405                                         IEEE80211_MAX_QUEUE_MAP,
1406                                         IEEE80211_QUEUE_STOP_REASON_PS,
1407                                         false);
1408 }
1409
1410 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1411 {
1412         struct ieee80211_local *local =
1413                 container_of(work, struct ieee80211_local,
1414                              dynamic_ps_enable_work);
1415         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1416         struct ieee80211_if_managed *ifmgd;
1417         unsigned long flags;
1418         int q;
1419
1420         /* can only happen when PS was just disabled anyway */
1421         if (!sdata)
1422                 return;
1423
1424         ifmgd = &sdata->u.mgd;
1425
1426         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1427                 return;
1428
1429         if (local->hw.conf.dynamic_ps_timeout > 0) {
1430                 /* don't enter PS if TX frames are pending */
1431                 if (drv_tx_frames_pending(local)) {
1432                         mod_timer(&local->dynamic_ps_timer, jiffies +
1433                                   msecs_to_jiffies(
1434                                   local->hw.conf.dynamic_ps_timeout));
1435                         return;
1436                 }
1437
1438                 /*
1439                  * transmission can be stopped by others which leads to
1440                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1441                  * is not the actual idle state.
1442                  */
1443                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1444                 for (q = 0; q < local->hw.queues; q++) {
1445                         if (local->queue_stop_reasons[q]) {
1446                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1447                                                        flags);
1448                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1449                                           msecs_to_jiffies(
1450                                           local->hw.conf.dynamic_ps_timeout));
1451                                 return;
1452                         }
1453                 }
1454                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1455         }
1456
1457         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1458             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1459                 if (drv_tx_frames_pending(local)) {
1460                         mod_timer(&local->dynamic_ps_timer, jiffies +
1461                                   msecs_to_jiffies(
1462                                   local->hw.conf.dynamic_ps_timeout));
1463                 } else {
1464                         ieee80211_send_nullfunc(local, sdata, 1);
1465                         /* Flush to get the tx status of nullfunc frame */
1466                         ieee80211_flush_queues(local, sdata);
1467                 }
1468         }
1469
1470         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1471               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1472             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1473                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1474                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1475                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1476         }
1477 }
1478
1479 void ieee80211_dynamic_ps_timer(unsigned long data)
1480 {
1481         struct ieee80211_local *local = (void *) data;
1482
1483         if (local->quiescing || local->suspended)
1484                 return;
1485
1486         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1487 }
1488
1489 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1490 {
1491         struct delayed_work *delayed_work =
1492                 container_of(work, struct delayed_work, work);
1493         struct ieee80211_sub_if_data *sdata =
1494                 container_of(delayed_work, struct ieee80211_sub_if_data,
1495                              dfs_cac_timer_work);
1496         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1497
1498         mutex_lock(&sdata->local->mtx);
1499         if (sdata->wdev.cac_started) {
1500                 ieee80211_vif_release_channel(sdata);
1501                 cfg80211_cac_event(sdata->dev, &chandef,
1502                                    NL80211_RADAR_CAC_FINISHED,
1503                                    GFP_KERNEL);
1504         }
1505         mutex_unlock(&sdata->local->mtx);
1506 }
1507
1508 /* MLME */
1509 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1510                                      struct ieee80211_sub_if_data *sdata,
1511                                      const u8 *wmm_param, size_t wmm_param_len)
1512 {
1513         struct ieee80211_tx_queue_params params;
1514         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1515         size_t left;
1516         int count;
1517         const u8 *pos;
1518         u8 uapsd_queues = 0;
1519
1520         if (!local->ops->conf_tx)
1521                 return false;
1522
1523         if (local->hw.queues < IEEE80211_NUM_ACS)
1524                 return false;
1525
1526         if (!wmm_param)
1527                 return false;
1528
1529         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1530                 return false;
1531
1532         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1533                 uapsd_queues = ifmgd->uapsd_queues;
1534
1535         count = wmm_param[6] & 0x0f;
1536         if (count == ifmgd->wmm_last_param_set)
1537                 return false;
1538         ifmgd->wmm_last_param_set = count;
1539
1540         pos = wmm_param + 8;
1541         left = wmm_param_len - 8;
1542
1543         memset(&params, 0, sizeof(params));
1544
1545         sdata->wmm_acm = 0;
1546         for (; left >= 4; left -= 4, pos += 4) {
1547                 int aci = (pos[0] >> 5) & 0x03;
1548                 int acm = (pos[0] >> 4) & 0x01;
1549                 bool uapsd = false;
1550                 int queue;
1551
1552                 switch (aci) {
1553                 case 1: /* AC_BK */
1554                         queue = 3;
1555                         if (acm)
1556                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1557                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1558                                 uapsd = true;
1559                         break;
1560                 case 2: /* AC_VI */
1561                         queue = 1;
1562                         if (acm)
1563                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1564                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1565                                 uapsd = true;
1566                         break;
1567                 case 3: /* AC_VO */
1568                         queue = 0;
1569                         if (acm)
1570                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1571                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1572                                 uapsd = true;
1573                         break;
1574                 case 0: /* AC_BE */
1575                 default:
1576                         queue = 2;
1577                         if (acm)
1578                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1579                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1580                                 uapsd = true;
1581                         break;
1582                 }
1583
1584                 params.aifs = pos[0] & 0x0f;
1585                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1586                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1587                 params.txop = get_unaligned_le16(pos + 2);
1588                 params.acm = acm;
1589                 params.uapsd = uapsd;
1590
1591                 mlme_dbg(sdata,
1592                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1593                          queue, aci, acm,
1594                          params.aifs, params.cw_min, params.cw_max,
1595                          params.txop, params.uapsd);
1596                 sdata->tx_conf[queue] = params;
1597                 if (drv_conf_tx(local, sdata, queue, &params))
1598                         sdata_err(sdata,
1599                                   "failed to set TX queue parameters for queue %d\n",
1600                                   queue);
1601         }
1602
1603         /* enable WMM or activate new settings */
1604         sdata->vif.bss_conf.qos = true;
1605         return true;
1606 }
1607
1608 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1609 {
1610         lockdep_assert_held(&sdata->local->mtx);
1611
1612         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1613         ieee80211_run_deferred_scan(sdata->local);
1614 }
1615
1616 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1617 {
1618         mutex_lock(&sdata->local->mtx);
1619         __ieee80211_stop_poll(sdata);
1620         mutex_unlock(&sdata->local->mtx);
1621 }
1622
1623 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1624                                            u16 capab, bool erp_valid, u8 erp)
1625 {
1626         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1627         u32 changed = 0;
1628         bool use_protection;
1629         bool use_short_preamble;
1630         bool use_short_slot;
1631
1632         if (erp_valid) {
1633                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1634                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1635         } else {
1636                 use_protection = false;
1637                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1638         }
1639
1640         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1641         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1642                 use_short_slot = true;
1643
1644         if (use_protection != bss_conf->use_cts_prot) {
1645                 bss_conf->use_cts_prot = use_protection;
1646                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1647         }
1648
1649         if (use_short_preamble != bss_conf->use_short_preamble) {
1650                 bss_conf->use_short_preamble = use_short_preamble;
1651                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1652         }
1653
1654         if (use_short_slot != bss_conf->use_short_slot) {
1655                 bss_conf->use_short_slot = use_short_slot;
1656                 changed |= BSS_CHANGED_ERP_SLOT;
1657         }
1658
1659         return changed;
1660 }
1661
1662 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1663                                      struct cfg80211_bss *cbss,
1664                                      u32 bss_info_changed)
1665 {
1666         struct ieee80211_bss *bss = (void *)cbss->priv;
1667         struct ieee80211_local *local = sdata->local;
1668         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1669
1670         bss_info_changed |= BSS_CHANGED_ASSOC;
1671         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1672                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1673
1674         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1675                 beacon_loss_count * bss_conf->beacon_int));
1676
1677         sdata->u.mgd.associated = cbss;
1678         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1679
1680         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1681
1682         if (sdata->vif.p2p) {
1683                 const struct cfg80211_bss_ies *ies;
1684
1685                 rcu_read_lock();
1686                 ies = rcu_dereference(cbss->ies);
1687                 if (ies) {
1688                         int ret;
1689
1690                         ret = cfg80211_get_p2p_attr(
1691                                         ies->data, ies->len,
1692                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1693                                         (u8 *) &bss_conf->p2p_noa_attr,
1694                                         sizeof(bss_conf->p2p_noa_attr));
1695                         if (ret >= 2) {
1696                                 sdata->u.mgd.p2p_noa_index =
1697                                         bss_conf->p2p_noa_attr.index;
1698                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1699                         }
1700                 }
1701                 rcu_read_unlock();
1702         }
1703
1704         /* just to be sure */
1705         ieee80211_stop_poll(sdata);
1706
1707         ieee80211_led_assoc(local, 1);
1708
1709         if (sdata->u.mgd.have_beacon) {
1710                 /*
1711                  * If the AP is buggy we may get here with no DTIM period
1712                  * known, so assume it's 1 which is the only safe assumption
1713                  * in that case, although if the TIM IE is broken powersave
1714                  * probably just won't work at all.
1715                  */
1716                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1717                 bss_conf->beacon_rate = bss->beacon_rate;
1718                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1719         } else {
1720                 bss_conf->beacon_rate = NULL;
1721                 bss_conf->dtim_period = 0;
1722         }
1723
1724         bss_conf->assoc = 1;
1725
1726         /* Tell the driver to monitor connection quality (if supported) */
1727         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1728             bss_conf->cqm_rssi_thold)
1729                 bss_info_changed |= BSS_CHANGED_CQM;
1730
1731         /* Enable ARP filtering */
1732         if (bss_conf->arp_addr_cnt)
1733                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1734
1735         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1736
1737         mutex_lock(&local->iflist_mtx);
1738         ieee80211_recalc_ps(local, -1);
1739         mutex_unlock(&local->iflist_mtx);
1740
1741         ieee80211_recalc_smps(sdata);
1742         ieee80211_recalc_ps_vif(sdata);
1743
1744         netif_carrier_on(sdata->dev);
1745 }
1746
1747 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1748                                    u16 stype, u16 reason, bool tx,
1749                                    u8 *frame_buf)
1750 {
1751         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1752         struct ieee80211_local *local = sdata->local;
1753         u32 changed = 0;
1754
1755         sdata_assert_lock(sdata);
1756
1757         if (WARN_ON_ONCE(tx && !frame_buf))
1758                 return;
1759
1760         if (WARN_ON(!ifmgd->associated))
1761                 return;
1762
1763         ieee80211_stop_poll(sdata);
1764
1765         ifmgd->associated = NULL;
1766         netif_carrier_off(sdata->dev);
1767
1768         /*
1769          * if we want to get out of ps before disassoc (why?) we have
1770          * to do it before sending disassoc, as otherwise the null-packet
1771          * won't be valid.
1772          */
1773         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1774                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1775                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1776         }
1777         local->ps_sdata = NULL;
1778
1779         /* disable per-vif ps */
1780         ieee80211_recalc_ps_vif(sdata);
1781
1782         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1783         if (tx)
1784                 ieee80211_flush_queues(local, sdata);
1785
1786         /* deauthenticate/disassociate now */
1787         if (tx || frame_buf)
1788                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1789                                                reason, tx, frame_buf);
1790
1791         /* flush out frame */
1792         if (tx)
1793                 ieee80211_flush_queues(local, sdata);
1794
1795         /* clear bssid only after building the needed mgmt frames */
1796         memset(ifmgd->bssid, 0, ETH_ALEN);
1797
1798         /* remove AP and TDLS peers */
1799         sta_info_flush(sdata);
1800
1801         /* finally reset all BSS / config parameters */
1802         changed |= ieee80211_reset_erp_info(sdata);
1803
1804         ieee80211_led_assoc(local, 0);
1805         changed |= BSS_CHANGED_ASSOC;
1806         sdata->vif.bss_conf.assoc = false;
1807
1808         ifmgd->p2p_noa_index = -1;
1809         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1810                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1811
1812         /* on the next assoc, re-program HT/VHT parameters */
1813         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1814         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1815         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1816         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1817
1818         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1819
1820         del_timer_sync(&local->dynamic_ps_timer);
1821         cancel_work_sync(&local->dynamic_ps_enable_work);
1822
1823         /* Disable ARP filtering */
1824         if (sdata->vif.bss_conf.arp_addr_cnt)
1825                 changed |= BSS_CHANGED_ARP_FILTER;
1826
1827         sdata->vif.bss_conf.qos = false;
1828         changed |= BSS_CHANGED_QOS;
1829
1830         /* The BSSID (not really interesting) and HT changed */
1831         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1832         ieee80211_bss_info_change_notify(sdata, changed);
1833
1834         /* disassociated - set to defaults now */
1835         ieee80211_set_wmm_default(sdata, false);
1836
1837         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1838         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1839         del_timer_sync(&sdata->u.mgd.timer);
1840         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1841
1842         sdata->vif.bss_conf.dtim_period = 0;
1843         sdata->vif.bss_conf.beacon_rate = NULL;
1844
1845         ifmgd->have_beacon = false;
1846
1847         ifmgd->flags = 0;
1848         mutex_lock(&local->mtx);
1849         ieee80211_vif_release_channel(sdata);
1850
1851         sdata->vif.csa_active = false;
1852         if (sdata->csa_block_tx) {
1853                 ieee80211_wake_vif_queues(local, sdata,
1854                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1855                 sdata->csa_block_tx = false;
1856         }
1857         mutex_unlock(&local->mtx);
1858
1859         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1860 }
1861
1862 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1863                              struct ieee80211_hdr *hdr)
1864 {
1865         /*
1866          * We can postpone the mgd.timer whenever receiving unicast frames
1867          * from AP because we know that the connection is working both ways
1868          * at that time. But multicast frames (and hence also beacons) must
1869          * be ignored here, because we need to trigger the timer during
1870          * data idle periods for sending the periodic probe request to the
1871          * AP we're connected to.
1872          */
1873         if (is_multicast_ether_addr(hdr->addr1))
1874                 return;
1875
1876         ieee80211_sta_reset_conn_monitor(sdata);
1877 }
1878
1879 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1880 {
1881         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1882         struct ieee80211_local *local = sdata->local;
1883
1884         mutex_lock(&local->mtx);
1885         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
1886                 goto out;
1887
1888         __ieee80211_stop_poll(sdata);
1889
1890         mutex_lock(&local->iflist_mtx);
1891         ieee80211_recalc_ps(local, -1);
1892         mutex_unlock(&local->iflist_mtx);
1893
1894         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1895                 goto out;
1896
1897         /*
1898          * We've received a probe response, but are not sure whether
1899          * we have or will be receiving any beacons or data, so let's
1900          * schedule the timers again, just in case.
1901          */
1902         ieee80211_sta_reset_beacon_monitor(sdata);
1903
1904         mod_timer(&ifmgd->conn_mon_timer,
1905                   round_jiffies_up(jiffies +
1906                                    IEEE80211_CONNECTION_IDLE_TIME));
1907 out:
1908         mutex_unlock(&local->mtx);
1909 }
1910
1911 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1912                              struct ieee80211_hdr *hdr, bool ack)
1913 {
1914         if (!ieee80211_is_data(hdr->frame_control))
1915             return;
1916
1917         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1918             sdata->u.mgd.probe_send_count > 0) {
1919                 if (ack)
1920                         ieee80211_sta_reset_conn_monitor(sdata);
1921                 else
1922                         sdata->u.mgd.nullfunc_failed = true;
1923                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1924                 return;
1925         }
1926
1927         if (ack)
1928                 ieee80211_sta_reset_conn_monitor(sdata);
1929 }
1930
1931 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1932 {
1933         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1934         const u8 *ssid;
1935         u8 *dst = ifmgd->associated->bssid;
1936         u8 unicast_limit = max(1, max_probe_tries - 3);
1937
1938         /*
1939          * Try sending broadcast probe requests for the last three
1940          * probe requests after the first ones failed since some
1941          * buggy APs only support broadcast probe requests.
1942          */
1943         if (ifmgd->probe_send_count >= unicast_limit)
1944                 dst = NULL;
1945
1946         /*
1947          * When the hardware reports an accurate Tx ACK status, it's
1948          * better to send a nullfunc frame instead of a probe request,
1949          * as it will kick us off the AP quickly if we aren't associated
1950          * anymore. The timeout will be reset if the frame is ACKed by
1951          * the AP.
1952          */
1953         ifmgd->probe_send_count++;
1954
1955         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1956                 ifmgd->nullfunc_failed = false;
1957                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1958         } else {
1959                 int ssid_len;
1960
1961                 rcu_read_lock();
1962                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1963                 if (WARN_ON_ONCE(ssid == NULL))
1964                         ssid_len = 0;
1965                 else
1966                         ssid_len = ssid[1];
1967
1968                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1969                                          0, (u32) -1, true, 0,
1970                                          ifmgd->associated->channel, false);
1971                 rcu_read_unlock();
1972         }
1973
1974         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1975         run_again(sdata, ifmgd->probe_timeout);
1976         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1977                 ieee80211_flush_queues(sdata->local, sdata);
1978 }
1979
1980 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1981                                    bool beacon)
1982 {
1983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1984         bool already = false;
1985
1986         if (!ieee80211_sdata_running(sdata))
1987                 return;
1988
1989         sdata_lock(sdata);
1990
1991         if (!ifmgd->associated)
1992                 goto out;
1993
1994         mutex_lock(&sdata->local->mtx);
1995
1996         if (sdata->local->tmp_channel || sdata->local->scanning) {
1997                 mutex_unlock(&sdata->local->mtx);
1998                 goto out;
1999         }
2000
2001         if (beacon) {
2002                 mlme_dbg_ratelimited(sdata,
2003                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2004                                      beacon_loss_count);
2005
2006                 ieee80211_cqm_rssi_notify(&sdata->vif,
2007                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
2008                                           GFP_KERNEL);
2009         }
2010
2011         /*
2012          * The driver/our work has already reported this event or the
2013          * connection monitoring has kicked in and we have already sent
2014          * a probe request. Or maybe the AP died and the driver keeps
2015          * reporting until we disassociate...
2016          *
2017          * In either case we have to ignore the current call to this
2018          * function (except for setting the correct probe reason bit)
2019          * because otherwise we would reset the timer every time and
2020          * never check whether we received a probe response!
2021          */
2022         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2023                 already = true;
2024
2025         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2026
2027         mutex_unlock(&sdata->local->mtx);
2028
2029         if (already)
2030                 goto out;
2031
2032         mutex_lock(&sdata->local->iflist_mtx);
2033         ieee80211_recalc_ps(sdata->local, -1);
2034         mutex_unlock(&sdata->local->iflist_mtx);
2035
2036         ifmgd->probe_send_count = 0;
2037         ieee80211_mgd_probe_ap_send(sdata);
2038  out:
2039         sdata_unlock(sdata);
2040 }
2041
2042 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2043                                           struct ieee80211_vif *vif)
2044 {
2045         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2046         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2047         struct cfg80211_bss *cbss;
2048         struct sk_buff *skb;
2049         const u8 *ssid;
2050         int ssid_len;
2051
2052         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2053                 return NULL;
2054
2055         sdata_assert_lock(sdata);
2056
2057         if (ifmgd->associated)
2058                 cbss = ifmgd->associated;
2059         else if (ifmgd->auth_data)
2060                 cbss = ifmgd->auth_data->bss;
2061         else if (ifmgd->assoc_data)
2062                 cbss = ifmgd->assoc_data->bss;
2063         else
2064                 return NULL;
2065
2066         rcu_read_lock();
2067         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2068         if (WARN_ON_ONCE(ssid == NULL))
2069                 ssid_len = 0;
2070         else
2071                 ssid_len = ssid[1];
2072
2073         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2074                                         (u32) -1, cbss->channel,
2075                                         ssid + 2, ssid_len,
2076                                         NULL, 0, true);
2077         rcu_read_unlock();
2078
2079         return skb;
2080 }
2081 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2082
2083 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2084 {
2085         struct ieee80211_local *local = sdata->local;
2086         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2087         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2088
2089         sdata_lock(sdata);
2090         if (!ifmgd->associated) {
2091                 sdata_unlock(sdata);
2092                 return;
2093         }
2094
2095         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2096                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2097                                true, frame_buf);
2098         mutex_lock(&local->mtx);
2099         sdata->vif.csa_active = false;
2100         if (sdata->csa_block_tx) {
2101                 ieee80211_wake_vif_queues(local, sdata,
2102                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2103                 sdata->csa_block_tx = false;
2104         }
2105         mutex_unlock(&local->mtx);
2106
2107         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2108                               IEEE80211_DEAUTH_FRAME_LEN);
2109         sdata_unlock(sdata);
2110 }
2111
2112 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2113 {
2114         struct ieee80211_sub_if_data *sdata =
2115                 container_of(work, struct ieee80211_sub_if_data,
2116                              u.mgd.beacon_connection_loss_work);
2117         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2118         struct sta_info *sta;
2119
2120         if (ifmgd->associated) {
2121                 rcu_read_lock();
2122                 sta = sta_info_get(sdata, ifmgd->bssid);
2123                 if (sta)
2124                         sta->beacon_loss_count++;
2125                 rcu_read_unlock();
2126         }
2127
2128         if (ifmgd->connection_loss) {
2129                 sdata_info(sdata, "Connection to AP %pM lost\n",
2130                            ifmgd->bssid);
2131                 __ieee80211_disconnect(sdata);
2132         } else {
2133                 ieee80211_mgd_probe_ap(sdata, true);
2134         }
2135 }
2136
2137 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2138 {
2139         struct ieee80211_sub_if_data *sdata =
2140                 container_of(work, struct ieee80211_sub_if_data,
2141                              u.mgd.csa_connection_drop_work);
2142
2143         __ieee80211_disconnect(sdata);
2144 }
2145
2146 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2147 {
2148         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2149         struct ieee80211_hw *hw = &sdata->local->hw;
2150
2151         trace_api_beacon_loss(sdata);
2152
2153         sdata->u.mgd.connection_loss = false;
2154         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2155 }
2156 EXPORT_SYMBOL(ieee80211_beacon_loss);
2157
2158 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2159 {
2160         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2161         struct ieee80211_hw *hw = &sdata->local->hw;
2162
2163         trace_api_connection_loss(sdata);
2164
2165         sdata->u.mgd.connection_loss = true;
2166         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2167 }
2168 EXPORT_SYMBOL(ieee80211_connection_loss);
2169
2170
2171 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2172                                         bool assoc)
2173 {
2174         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2175
2176         sdata_assert_lock(sdata);
2177
2178         if (!assoc) {
2179                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2180
2181                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2182                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2183                 sdata->u.mgd.flags = 0;
2184                 mutex_lock(&sdata->local->mtx);
2185                 ieee80211_vif_release_channel(sdata);
2186                 mutex_unlock(&sdata->local->mtx);
2187         }
2188
2189         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2190         kfree(auth_data);
2191         sdata->u.mgd.auth_data = NULL;
2192 }
2193
2194 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2195                                      struct ieee80211_mgmt *mgmt, size_t len)
2196 {
2197         struct ieee80211_local *local = sdata->local;
2198         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2199         u8 *pos;
2200         struct ieee802_11_elems elems;
2201         u32 tx_flags = 0;
2202
2203         pos = mgmt->u.auth.variable;
2204         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2205         if (!elems.challenge)
2206                 return;
2207         auth_data->expected_transaction = 4;
2208         drv_mgd_prepare_tx(sdata->local, sdata);
2209         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2210                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2211                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2212         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2213                             elems.challenge - 2, elems.challenge_len + 2,
2214                             auth_data->bss->bssid, auth_data->bss->bssid,
2215                             auth_data->key, auth_data->key_len,
2216                             auth_data->key_idx, tx_flags);
2217 }
2218
2219 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2220                                    struct ieee80211_mgmt *mgmt, size_t len)
2221 {
2222         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2223         u8 bssid[ETH_ALEN];
2224         u16 auth_alg, auth_transaction, status_code;
2225         struct sta_info *sta;
2226
2227         sdata_assert_lock(sdata);
2228
2229         if (len < 24 + 6)
2230                 return;
2231
2232         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2233                 return;
2234
2235         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2236
2237         if (!ether_addr_equal(bssid, mgmt->bssid))
2238                 return;
2239
2240         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2241         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2242         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2243
2244         if (auth_alg != ifmgd->auth_data->algorithm ||
2245             auth_transaction != ifmgd->auth_data->expected_transaction) {
2246                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2247                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2248                            auth_transaction,
2249                            ifmgd->auth_data->expected_transaction);
2250                 return;
2251         }
2252
2253         if (status_code != WLAN_STATUS_SUCCESS) {
2254                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2255                            mgmt->sa, status_code);
2256                 ieee80211_destroy_auth_data(sdata, false);
2257                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2258                 return;
2259         }
2260
2261         switch (ifmgd->auth_data->algorithm) {
2262         case WLAN_AUTH_OPEN:
2263         case WLAN_AUTH_LEAP:
2264         case WLAN_AUTH_FT:
2265         case WLAN_AUTH_SAE:
2266                 break;
2267         case WLAN_AUTH_SHARED_KEY:
2268                 if (ifmgd->auth_data->expected_transaction != 4) {
2269                         ieee80211_auth_challenge(sdata, mgmt, len);
2270                         /* need another frame */
2271                         return;
2272                 }
2273                 break;
2274         default:
2275                 WARN_ONCE(1, "invalid auth alg %d",
2276                           ifmgd->auth_data->algorithm);
2277                 return;
2278         }
2279
2280         sdata_info(sdata, "authenticated\n");
2281         ifmgd->auth_data->done = true;
2282         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2283         ifmgd->auth_data->timeout_started = true;
2284         run_again(sdata, ifmgd->auth_data->timeout);
2285
2286         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2287             ifmgd->auth_data->expected_transaction != 2) {
2288                 /*
2289                  * Report auth frame to user space for processing since another
2290                  * round of Authentication frames is still needed.
2291                  */
2292                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2293                 return;
2294         }
2295
2296         /* move station state to auth */
2297         mutex_lock(&sdata->local->sta_mtx);
2298         sta = sta_info_get(sdata, bssid);
2299         if (!sta) {
2300                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2301                 goto out_err;
2302         }
2303         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2304                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2305                 goto out_err;
2306         }
2307         mutex_unlock(&sdata->local->sta_mtx);
2308
2309         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2310         return;
2311  out_err:
2312         mutex_unlock(&sdata->local->sta_mtx);
2313         /* ignore frame -- wait for timeout */
2314 }
2315
2316 #define case_WLAN(type) \
2317         case WLAN_REASON_##type: return #type
2318
2319 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2320 {
2321         switch (reason_code) {
2322         case_WLAN(UNSPECIFIED);
2323         case_WLAN(PREV_AUTH_NOT_VALID);
2324         case_WLAN(DEAUTH_LEAVING);
2325         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2326         case_WLAN(DISASSOC_AP_BUSY);
2327         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2328         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2329         case_WLAN(DISASSOC_STA_HAS_LEFT);
2330         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2331         case_WLAN(DISASSOC_BAD_POWER);
2332         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2333         case_WLAN(INVALID_IE);
2334         case_WLAN(MIC_FAILURE);
2335         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2336         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2337         case_WLAN(IE_DIFFERENT);
2338         case_WLAN(INVALID_GROUP_CIPHER);
2339         case_WLAN(INVALID_PAIRWISE_CIPHER);
2340         case_WLAN(INVALID_AKMP);
2341         case_WLAN(UNSUPP_RSN_VERSION);
2342         case_WLAN(INVALID_RSN_IE_CAP);
2343         case_WLAN(IEEE8021X_FAILED);
2344         case_WLAN(CIPHER_SUITE_REJECTED);
2345         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2346         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2347         case_WLAN(DISASSOC_LOW_ACK);
2348         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2349         case_WLAN(QSTA_LEAVE_QBSS);
2350         case_WLAN(QSTA_NOT_USE);
2351         case_WLAN(QSTA_REQUIRE_SETUP);
2352         case_WLAN(QSTA_TIMEOUT);
2353         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2354         case_WLAN(MESH_PEER_CANCELED);
2355         case_WLAN(MESH_MAX_PEERS);
2356         case_WLAN(MESH_CONFIG);
2357         case_WLAN(MESH_CLOSE);
2358         case_WLAN(MESH_MAX_RETRIES);
2359         case_WLAN(MESH_CONFIRM_TIMEOUT);
2360         case_WLAN(MESH_INVALID_GTK);
2361         case_WLAN(MESH_INCONSISTENT_PARAM);
2362         case_WLAN(MESH_INVALID_SECURITY);
2363         case_WLAN(MESH_PATH_ERROR);
2364         case_WLAN(MESH_PATH_NOFORWARD);
2365         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2366         case_WLAN(MAC_EXISTS_IN_MBSS);
2367         case_WLAN(MESH_CHAN_REGULATORY);
2368         case_WLAN(MESH_CHAN);
2369         default: return "<unknown>";
2370         }
2371 }
2372
2373 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2374                                      struct ieee80211_mgmt *mgmt, size_t len)
2375 {
2376         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2377         const u8 *bssid = NULL;
2378         u16 reason_code;
2379
2380         sdata_assert_lock(sdata);
2381
2382         if (len < 24 + 2)
2383                 return;
2384
2385         if (!ifmgd->associated ||
2386             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2387                 return;
2388
2389         bssid = ifmgd->associated->bssid;
2390
2391         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2392
2393         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2394                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2395
2396         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2397
2398         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2399 }
2400
2401
2402 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2403                                        struct ieee80211_mgmt *mgmt, size_t len)
2404 {
2405         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2406         u16 reason_code;
2407
2408         sdata_assert_lock(sdata);
2409
2410         if (len < 24 + 2)
2411                 return;
2412
2413         if (!ifmgd->associated ||
2414             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2415                 return;
2416
2417         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2418
2419         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2420                    mgmt->sa, reason_code);
2421
2422         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2423
2424         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2425 }
2426
2427 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2428                                 u8 *supp_rates, unsigned int supp_rates_len,
2429                                 u32 *rates, u32 *basic_rates,
2430                                 bool *have_higher_than_11mbit,
2431                                 int *min_rate, int *min_rate_index,
2432                                 int shift, u32 rate_flags)
2433 {
2434         int i, j;
2435
2436         for (i = 0; i < supp_rates_len; i++) {
2437                 int rate = supp_rates[i] & 0x7f;
2438                 bool is_basic = !!(supp_rates[i] & 0x80);
2439
2440                 if ((rate * 5 * (1 << shift)) > 110)
2441                         *have_higher_than_11mbit = true;
2442
2443                 /*
2444                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2445                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2446                  *
2447                  * Note: Even through the membership selector and the basic
2448                  *       rate flag share the same bit, they are not exactly
2449                  *       the same.
2450                  */
2451                 if (!!(supp_rates[i] & 0x80) &&
2452                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2453                         continue;
2454
2455                 for (j = 0; j < sband->n_bitrates; j++) {
2456                         struct ieee80211_rate *br;
2457                         int brate;
2458
2459                         br = &sband->bitrates[j];
2460                         if ((rate_flags & br->flags) != rate_flags)
2461                                 continue;
2462
2463                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2464                         if (brate == rate) {
2465                                 *rates |= BIT(j);
2466                                 if (is_basic)
2467                                         *basic_rates |= BIT(j);
2468                                 if ((rate * 5) < *min_rate) {
2469                                         *min_rate = rate * 5;
2470                                         *min_rate_index = j;
2471                                 }
2472                                 break;
2473                         }
2474                 }
2475         }
2476 }
2477
2478 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2479                                          bool assoc)
2480 {
2481         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2482
2483         sdata_assert_lock(sdata);
2484
2485         if (!assoc) {
2486                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2487
2488                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2489                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2490                 sdata->u.mgd.flags = 0;
2491                 mutex_lock(&sdata->local->mtx);
2492                 ieee80211_vif_release_channel(sdata);
2493                 mutex_unlock(&sdata->local->mtx);
2494         }
2495
2496         kfree(assoc_data);
2497         sdata->u.mgd.assoc_data = NULL;
2498 }
2499
2500 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2501                                     struct cfg80211_bss *cbss,
2502                                     struct ieee80211_mgmt *mgmt, size_t len)
2503 {
2504         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2505         struct ieee80211_local *local = sdata->local;
2506         struct ieee80211_supported_band *sband;
2507         struct sta_info *sta;
2508         u8 *pos;
2509         u16 capab_info, aid;
2510         struct ieee802_11_elems elems;
2511         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2512         const struct cfg80211_bss_ies *bss_ies = NULL;
2513         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2514         u32 changed = 0;
2515         int err;
2516         bool ret;
2517
2518         /* AssocResp and ReassocResp have identical structure */
2519
2520         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2521         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2522
2523         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2524                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2525                            aid);
2526         aid &= ~(BIT(15) | BIT(14));
2527
2528         ifmgd->broken_ap = false;
2529
2530         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2531                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2532                            aid);
2533                 aid = 0;
2534                 ifmgd->broken_ap = true;
2535         }
2536
2537         pos = mgmt->u.assoc_resp.variable;
2538         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2539
2540         if (!elems.supp_rates) {
2541                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2542                 return false;
2543         }
2544
2545         ifmgd->aid = aid;
2546
2547         /*
2548          * Some APs are erroneously not including some information in their
2549          * (re)association response frames. Try to recover by using the data
2550          * from the beacon or probe response. This seems to afflict mobile
2551          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2552          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2553          */
2554         if ((assoc_data->wmm && !elems.wmm_param) ||
2555             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2556              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2557             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2558              (!elems.vht_cap_elem || !elems.vht_operation))) {
2559                 const struct cfg80211_bss_ies *ies;
2560                 struct ieee802_11_elems bss_elems;
2561
2562                 rcu_read_lock();
2563                 ies = rcu_dereference(cbss->ies);
2564                 if (ies)
2565                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2566                                           GFP_ATOMIC);
2567                 rcu_read_unlock();
2568                 if (!bss_ies)
2569                         return false;
2570
2571                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2572                                        false, &bss_elems);
2573                 if (assoc_data->wmm &&
2574                     !elems.wmm_param && bss_elems.wmm_param) {
2575                         elems.wmm_param = bss_elems.wmm_param;
2576                         sdata_info(sdata,
2577                                    "AP bug: WMM param missing from AssocResp\n");
2578                 }
2579
2580                 /*
2581                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2582                  * have to include the IEs in the (re)association response.
2583                  */
2584                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2585                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2586                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2587                         sdata_info(sdata,
2588                                    "AP bug: HT capability missing from AssocResp\n");
2589                 }
2590                 if (!elems.ht_operation && bss_elems.ht_operation &&
2591                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2592                         elems.ht_operation = bss_elems.ht_operation;
2593                         sdata_info(sdata,
2594                                    "AP bug: HT operation missing from AssocResp\n");
2595                 }
2596                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2597                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2598                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2599                         sdata_info(sdata,
2600                                    "AP bug: VHT capa missing from AssocResp\n");
2601                 }
2602                 if (!elems.vht_operation && bss_elems.vht_operation &&
2603                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2604                         elems.vht_operation = bss_elems.vht_operation;
2605                         sdata_info(sdata,
2606                                    "AP bug: VHT operation missing from AssocResp\n");
2607                 }
2608         }
2609
2610         /*
2611          * We previously checked these in the beacon/probe response, so
2612          * they should be present here. This is just a safety net.
2613          */
2614         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2615             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2616                 sdata_info(sdata,
2617                            "HT AP is missing WMM params or HT capability/operation\n");
2618                 ret = false;
2619                 goto out;
2620         }
2621
2622         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2623             (!elems.vht_cap_elem || !elems.vht_operation)) {
2624                 sdata_info(sdata,
2625                            "VHT AP is missing VHT capability/operation\n");
2626                 ret = false;
2627                 goto out;
2628         }
2629
2630         mutex_lock(&sdata->local->sta_mtx);
2631         /*
2632          * station info was already allocated and inserted before
2633          * the association and should be available to us
2634          */
2635         sta = sta_info_get(sdata, cbss->bssid);
2636         if (WARN_ON(!sta)) {
2637                 mutex_unlock(&sdata->local->sta_mtx);
2638                 ret = false;
2639                 goto out;
2640         }
2641
2642         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2643
2644         /* Set up internal HT/VHT capabilities */
2645         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2646                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2647                                                   elems.ht_cap_elem, sta);
2648
2649         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2650                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2651                                                     elems.vht_cap_elem, sta);
2652
2653         /*
2654          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2655          * in their association response, so ignore that data for our own
2656          * configuration. If it changed since the last beacon, we'll get the
2657          * next beacon and update then.
2658          */
2659
2660         /*
2661          * If an operating mode notification IE is present, override the
2662          * NSS calculation (that would be done in rate_control_rate_init())
2663          * and use the # of streams from that element.
2664          */
2665         if (elems.opmode_notif &&
2666             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2667                 u8 nss;
2668
2669                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2670                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2671                 nss += 1;
2672                 sta->sta.rx_nss = nss;
2673         }
2674
2675         rate_control_rate_init(sta);
2676
2677         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2678                 set_sta_flag(sta, WLAN_STA_MFP);
2679
2680         if (elems.wmm_param)
2681                 set_sta_flag(sta, WLAN_STA_WME);
2682
2683         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2684         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2685                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2686         if (err) {
2687                 sdata_info(sdata,
2688                            "failed to move station %pM to desired state\n",
2689                            sta->sta.addr);
2690                 WARN_ON(__sta_info_destroy(sta));
2691                 mutex_unlock(&sdata->local->sta_mtx);
2692                 ret = false;
2693                 goto out;
2694         }
2695
2696         mutex_unlock(&sdata->local->sta_mtx);
2697
2698         /*
2699          * Always handle WMM once after association regardless
2700          * of the first value the AP uses. Setting -1 here has
2701          * that effect because the AP values is an unsigned
2702          * 4-bit value.
2703          */
2704         ifmgd->wmm_last_param_set = -1;
2705
2706         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2707                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2708                                          elems.wmm_param_len);
2709         else
2710                 ieee80211_set_wmm_default(sdata, false);
2711         changed |= BSS_CHANGED_QOS;
2712
2713         /* set AID and assoc capability,
2714          * ieee80211_set_associated() will tell the driver */
2715         bss_conf->aid = aid;
2716         bss_conf->assoc_capability = capab_info;
2717         ieee80211_set_associated(sdata, cbss, changed);
2718
2719         /*
2720          * If we're using 4-addr mode, let the AP know that we're
2721          * doing so, so that it can create the STA VLAN on its side
2722          */
2723         if (ifmgd->use_4addr)
2724                 ieee80211_send_4addr_nullfunc(local, sdata);
2725
2726         /*
2727          * Start timer to probe the connection to the AP now.
2728          * Also start the timer that will detect beacon loss.
2729          */
2730         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2731         ieee80211_sta_reset_beacon_monitor(sdata);
2732
2733         ret = true;
2734  out:
2735         kfree(bss_ies);
2736         return ret;
2737 }
2738
2739 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2740                                          struct ieee80211_mgmt *mgmt,
2741                                          size_t len)
2742 {
2743         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2744         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2745         u16 capab_info, status_code, aid;
2746         struct ieee802_11_elems elems;
2747         u8 *pos;
2748         bool reassoc;
2749         struct cfg80211_bss *bss;
2750
2751         sdata_assert_lock(sdata);
2752
2753         if (!assoc_data)
2754                 return;
2755         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2756                 return;
2757
2758         /*
2759          * AssocResp and ReassocResp have identical structure, so process both
2760          * of them in this function.
2761          */
2762
2763         if (len < 24 + 6)
2764                 return;
2765
2766         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2767         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2768         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2769         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2770
2771         sdata_info(sdata,
2772                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2773                    reassoc ? "Rea" : "A", mgmt->sa,
2774                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2775
2776         pos = mgmt->u.assoc_resp.variable;
2777         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2778
2779         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2780             elems.timeout_int &&
2781             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2782                 u32 tu, ms;
2783                 tu = le32_to_cpu(elems.timeout_int->value);
2784                 ms = tu * 1024 / 1000;
2785                 sdata_info(sdata,
2786                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2787                            mgmt->sa, tu, ms);
2788                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2789                 assoc_data->timeout_started = true;
2790                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2791                         run_again(sdata, assoc_data->timeout);
2792                 return;
2793         }
2794
2795         bss = assoc_data->bss;
2796
2797         if (status_code != WLAN_STATUS_SUCCESS) {
2798                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2799                            mgmt->sa, status_code);
2800                 ieee80211_destroy_assoc_data(sdata, false);
2801         } else {
2802                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2803                         /* oops -- internal error -- send timeout for now */
2804                         ieee80211_destroy_assoc_data(sdata, false);
2805                         cfg80211_assoc_timeout(sdata->dev, bss);
2806                         return;
2807                 }
2808                 sdata_info(sdata, "associated\n");
2809
2810                 /*
2811                  * destroy assoc_data afterwards, as otherwise an idle
2812                  * recalc after assoc_data is NULL but before associated
2813                  * is set can cause the interface to go idle
2814                  */
2815                 ieee80211_destroy_assoc_data(sdata, true);
2816         }
2817
2818         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
2819 }
2820
2821 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2822                                   struct ieee80211_mgmt *mgmt, size_t len,
2823                                   struct ieee80211_rx_status *rx_status,
2824                                   struct ieee802_11_elems *elems)
2825 {
2826         struct ieee80211_local *local = sdata->local;
2827         struct ieee80211_bss *bss;
2828         struct ieee80211_channel *channel;
2829
2830         sdata_assert_lock(sdata);
2831
2832         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
2833         if (!channel)
2834                 return;
2835
2836         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2837                                         channel);
2838         if (bss) {
2839                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2840                 ieee80211_rx_bss_put(local, bss);
2841         }
2842 }
2843
2844
2845 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2846                                          struct sk_buff *skb)
2847 {
2848         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2849         struct ieee80211_if_managed *ifmgd;
2850         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2851         size_t baselen, len = skb->len;
2852         struct ieee802_11_elems elems;
2853
2854         ifmgd = &sdata->u.mgd;
2855
2856         sdata_assert_lock(sdata);
2857
2858         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2859                 return; /* ignore ProbeResp to foreign address */
2860
2861         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2862         if (baselen > len)
2863                 return;
2864
2865         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2866                                false, &elems);
2867
2868         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2869
2870         if (ifmgd->associated &&
2871             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2872                 ieee80211_reset_ap_probe(sdata);
2873
2874         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2875             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2876                 /* got probe response, continue with auth */
2877                 sdata_info(sdata, "direct probe responded\n");
2878                 ifmgd->auth_data->tries = 0;
2879                 ifmgd->auth_data->timeout = jiffies;
2880                 ifmgd->auth_data->timeout_started = true;
2881                 run_again(sdata, ifmgd->auth_data->timeout);
2882         }
2883 }
2884
2885 /*
2886  * This is the canonical list of information elements we care about,
2887  * the filter code also gives us all changes to the Microsoft OUI
2888  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2889  *
2890  * We implement beacon filtering in software since that means we can
2891  * avoid processing the frame here and in cfg80211, and userspace
2892  * will not be able to tell whether the hardware supports it or not.
2893  *
2894  * XXX: This list needs to be dynamic -- userspace needs to be able to
2895  *      add items it requires. It also needs to be able to tell us to
2896  *      look out for other vendor IEs.
2897  */
2898 static const u64 care_about_ies =
2899         (1ULL << WLAN_EID_COUNTRY) |
2900         (1ULL << WLAN_EID_ERP_INFO) |
2901         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2902         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2903         (1ULL << WLAN_EID_HT_CAPABILITY) |
2904         (1ULL << WLAN_EID_HT_OPERATION);
2905
2906 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2907                                      struct ieee80211_mgmt *mgmt, size_t len,
2908                                      struct ieee80211_rx_status *rx_status)
2909 {
2910         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2911         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2912         size_t baselen;
2913         struct ieee802_11_elems elems;
2914         struct ieee80211_local *local = sdata->local;
2915         struct ieee80211_chanctx_conf *chanctx_conf;
2916         struct ieee80211_channel *chan;
2917         struct sta_info *sta;
2918         u32 changed = 0;
2919         bool erp_valid;
2920         u8 erp_value = 0;
2921         u32 ncrc;
2922         u8 *bssid;
2923         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2924
2925         sdata_assert_lock(sdata);
2926
2927         /* Process beacon from the current BSS */
2928         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2929         if (baselen > len)
2930                 return;
2931
2932         rcu_read_lock();
2933         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2934         if (!chanctx_conf) {
2935                 rcu_read_unlock();
2936                 return;
2937         }
2938
2939         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2940                 rcu_read_unlock();
2941                 return;
2942         }
2943         chan = chanctx_conf->def.chan;
2944         rcu_read_unlock();
2945
2946         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2947             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2948                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2949                                        len - baselen, false, &elems);
2950
2951                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2952                 if (elems.tim && !elems.parse_error) {
2953                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
2954                         ifmgd->dtim_period = tim_ie->dtim_period;
2955                 }
2956                 ifmgd->have_beacon = true;
2957                 ifmgd->assoc_data->need_beacon = false;
2958                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2959                         sdata->vif.bss_conf.sync_tsf =
2960                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2961                         sdata->vif.bss_conf.sync_device_ts =
2962                                 rx_status->device_timestamp;
2963                         if (elems.tim)
2964                                 sdata->vif.bss_conf.sync_dtim_count =
2965                                         elems.tim->dtim_count;
2966                         else
2967                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2968                 }
2969                 /* continue assoc process */
2970                 ifmgd->assoc_data->timeout = jiffies;
2971                 ifmgd->assoc_data->timeout_started = true;
2972                 run_again(sdata, ifmgd->assoc_data->timeout);
2973                 return;
2974         }
2975
2976         if (!ifmgd->associated ||
2977             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2978                 return;
2979         bssid = ifmgd->associated->bssid;
2980
2981         /* Track average RSSI from the Beacon frames of the current AP */
2982         ifmgd->last_beacon_signal = rx_status->signal;
2983         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2984                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2985                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2986                 ifmgd->last_cqm_event_signal = 0;
2987                 ifmgd->count_beacon_signal = 1;
2988                 ifmgd->last_ave_beacon_signal = 0;
2989         } else {
2990                 ifmgd->ave_beacon_signal =
2991                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2992                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2993                          ifmgd->ave_beacon_signal) / 16;
2994                 ifmgd->count_beacon_signal++;
2995         }
2996
2997         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2998             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2999                 int sig = ifmgd->ave_beacon_signal;
3000                 int last_sig = ifmgd->last_ave_beacon_signal;
3001
3002                 /*
3003                  * if signal crosses either of the boundaries, invoke callback
3004                  * with appropriate parameters
3005                  */
3006                 if (sig > ifmgd->rssi_max_thold &&
3007                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3008                         ifmgd->last_ave_beacon_signal = sig;
3009                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3010                 } else if (sig < ifmgd->rssi_min_thold &&
3011                            (last_sig >= ifmgd->rssi_max_thold ||
3012                            last_sig == 0)) {
3013                         ifmgd->last_ave_beacon_signal = sig;
3014                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3015                 }
3016         }
3017
3018         if (bss_conf->cqm_rssi_thold &&
3019             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3020             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3021                 int sig = ifmgd->ave_beacon_signal / 16;
3022                 int last_event = ifmgd->last_cqm_event_signal;
3023                 int thold = bss_conf->cqm_rssi_thold;
3024                 int hyst = bss_conf->cqm_rssi_hyst;
3025                 if (sig < thold &&
3026                     (last_event == 0 || sig < last_event - hyst)) {
3027                         ifmgd->last_cqm_event_signal = sig;
3028                         ieee80211_cqm_rssi_notify(
3029                                 &sdata->vif,
3030                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3031                                 GFP_KERNEL);
3032                 } else if (sig > thold &&
3033                            (last_event == 0 || sig > last_event + hyst)) {
3034                         ifmgd->last_cqm_event_signal = sig;
3035                         ieee80211_cqm_rssi_notify(
3036                                 &sdata->vif,
3037                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3038                                 GFP_KERNEL);
3039                 }
3040         }
3041
3042         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3043                 mlme_dbg_ratelimited(sdata,
3044                                      "cancelling AP probe due to a received beacon\n");
3045                 ieee80211_reset_ap_probe(sdata);
3046         }
3047
3048         /*
3049          * Push the beacon loss detection into the future since
3050          * we are processing a beacon from the AP just now.
3051          */
3052         ieee80211_sta_reset_beacon_monitor(sdata);
3053
3054         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3055         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3056                                           len - baselen, false, &elems,
3057                                           care_about_ies, ncrc);
3058
3059         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3060                 bool directed_tim = ieee80211_check_tim(elems.tim,
3061                                                         elems.tim_len,
3062                                                         ifmgd->aid);
3063                 if (directed_tim) {
3064                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3065                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3066                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3067                                         ieee80211_hw_config(local,
3068                                                             IEEE80211_CONF_CHANGE_PS);
3069                                 }
3070                                 ieee80211_send_nullfunc(local, sdata, 0);
3071                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3072                                 local->pspolling = true;
3073
3074                                 /*
3075                                  * Here is assumed that the driver will be
3076                                  * able to send ps-poll frame and receive a
3077                                  * response even though power save mode is
3078                                  * enabled, but some drivers might require
3079                                  * to disable power save here. This needs
3080                                  * to be investigated.
3081                                  */
3082                                 ieee80211_send_pspoll(local, sdata);
3083                         }
3084                 }
3085         }
3086
3087         if (sdata->vif.p2p) {
3088                 struct ieee80211_p2p_noa_attr noa = {};
3089                 int ret;
3090
3091                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3092                                             len - baselen,
3093                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3094                                             (u8 *) &noa, sizeof(noa));
3095                 if (ret >= 2) {
3096                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3097                                 /* valid noa_attr and index changed */
3098                                 sdata->u.mgd.p2p_noa_index = noa.index;
3099                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3100                                 changed |= BSS_CHANGED_P2P_PS;
3101                                 /*
3102                                  * make sure we update all information, the CRC
3103                                  * mechanism doesn't look at P2P attributes.
3104                                  */
3105                                 ifmgd->beacon_crc_valid = false;
3106                         }
3107                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3108                         /* noa_attr not found and we had valid noa_attr before */
3109                         sdata->u.mgd.p2p_noa_index = -1;
3110                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3111                         changed |= BSS_CHANGED_P2P_PS;
3112                         ifmgd->beacon_crc_valid = false;
3113                 }
3114         }
3115
3116         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3117                 return;
3118         ifmgd->beacon_crc = ncrc;
3119         ifmgd->beacon_crc_valid = true;
3120
3121         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3122
3123         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3124                                          &elems, true);
3125
3126         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3127             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3128                                      elems.wmm_param_len))
3129                 changed |= BSS_CHANGED_QOS;
3130
3131         /*
3132          * If we haven't had a beacon before, tell the driver about the
3133          * DTIM period (and beacon timing if desired) now.
3134          */
3135         if (!ifmgd->have_beacon) {
3136                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3137                 if (elems.tim)
3138                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3139                 else
3140                         bss_conf->dtim_period = 1;
3141
3142                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3143                         sdata->vif.bss_conf.sync_tsf =
3144                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3145                         sdata->vif.bss_conf.sync_device_ts =
3146                                 rx_status->device_timestamp;
3147                         if (elems.tim)
3148                                 sdata->vif.bss_conf.sync_dtim_count =
3149                                         elems.tim->dtim_count;
3150                         else
3151                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3152                 }
3153
3154                 changed |= BSS_CHANGED_BEACON_INFO;
3155                 ifmgd->have_beacon = true;
3156
3157                 mutex_lock(&local->iflist_mtx);
3158                 ieee80211_recalc_ps(local, -1);
3159                 mutex_unlock(&local->iflist_mtx);
3160
3161                 ieee80211_recalc_ps_vif(sdata);
3162         }
3163
3164         if (elems.erp_info) {
3165                 erp_valid = true;
3166                 erp_value = elems.erp_info[0];
3167         } else {
3168                 erp_valid = false;
3169         }
3170         changed |= ieee80211_handle_bss_capability(sdata,
3171                         le16_to_cpu(mgmt->u.beacon.capab_info),
3172                         erp_valid, erp_value);
3173
3174         mutex_lock(&local->sta_mtx);
3175         sta = sta_info_get(sdata, bssid);
3176
3177         if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3178                                 elems.vht_operation, bssid, &changed)) {
3179                 mutex_unlock(&local->sta_mtx);
3180                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3181                                        WLAN_REASON_DEAUTH_LEAVING,
3182                                        true, deauth_buf);
3183                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3184                                       sizeof(deauth_buf));
3185                 return;
3186         }
3187
3188         if (sta && elems.opmode_notif)
3189                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3190                                             rx_status->band, true);
3191         mutex_unlock(&local->sta_mtx);
3192
3193         if (elems.country_elem && elems.pwr_constr_elem &&
3194             mgmt->u.probe_resp.capab_info &
3195                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3196                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3197                                                        elems.country_elem,
3198                                                        elems.country_elem_len,
3199                                                        elems.pwr_constr_elem);
3200
3201         ieee80211_bss_info_change_notify(sdata, changed);
3202 }
3203
3204 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3205                                   struct sk_buff *skb)
3206 {
3207         struct ieee80211_rx_status *rx_status;
3208         struct ieee80211_mgmt *mgmt;
3209         u16 fc;
3210         struct ieee802_11_elems elems;
3211         int ies_len;
3212
3213         rx_status = (struct ieee80211_rx_status *) skb->cb;
3214         mgmt = (struct ieee80211_mgmt *) skb->data;
3215         fc = le16_to_cpu(mgmt->frame_control);
3216
3217         sdata_lock(sdata);
3218
3219         switch (fc & IEEE80211_FCTL_STYPE) {
3220         case IEEE80211_STYPE_BEACON:
3221                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3222                 break;
3223         case IEEE80211_STYPE_PROBE_RESP:
3224                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3225                 break;
3226         case IEEE80211_STYPE_AUTH:
3227                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3228                 break;
3229         case IEEE80211_STYPE_DEAUTH:
3230                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3231                 break;
3232         case IEEE80211_STYPE_DISASSOC:
3233                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3234                 break;
3235         case IEEE80211_STYPE_ASSOC_RESP:
3236         case IEEE80211_STYPE_REASSOC_RESP:
3237                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3238                 break;
3239         case IEEE80211_STYPE_ACTION:
3240                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3241                         ies_len = skb->len -
3242                                   offsetof(struct ieee80211_mgmt,
3243                                            u.action.u.chan_switch.variable);
3244
3245                         if (ies_len < 0)
3246                                 break;
3247
3248                         ieee802_11_parse_elems(
3249                                 mgmt->u.action.u.chan_switch.variable,
3250                                 ies_len, true, &elems);
3251
3252                         if (elems.parse_error)
3253                                 break;
3254
3255                         ieee80211_sta_process_chanswitch(sdata,
3256                                                          rx_status->mactime,
3257                                                          &elems, false);
3258                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3259                         ies_len = skb->len -
3260                                   offsetof(struct ieee80211_mgmt,
3261                                            u.action.u.ext_chan_switch.variable);
3262
3263                         if (ies_len < 0)
3264                                 break;
3265
3266                         ieee802_11_parse_elems(
3267                                 mgmt->u.action.u.ext_chan_switch.variable,
3268                                 ies_len, true, &elems);
3269
3270                         if (elems.parse_error)
3271                                 break;
3272
3273                         /* for the handling code pretend this was also an IE */
3274                         elems.ext_chansw_ie =
3275                                 &mgmt->u.action.u.ext_chan_switch.data;
3276
3277                         ieee80211_sta_process_chanswitch(sdata,
3278                                                          rx_status->mactime,
3279                                                          &elems, false);
3280                 }
3281                 break;
3282         }
3283         sdata_unlock(sdata);
3284 }
3285
3286 static void ieee80211_sta_timer(unsigned long data)
3287 {
3288         struct ieee80211_sub_if_data *sdata =
3289                 (struct ieee80211_sub_if_data *) data;
3290
3291         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3292 }
3293
3294 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3295                                           u8 *bssid, u8 reason, bool tx)
3296 {
3297         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3298
3299         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3300                                tx, frame_buf);
3301
3302         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3303                               IEEE80211_DEAUTH_FRAME_LEN);
3304 }
3305
3306 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3307 {
3308         struct ieee80211_local *local = sdata->local;
3309         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3310         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3311         u32 tx_flags = 0;
3312
3313         sdata_assert_lock(sdata);
3314
3315         if (WARN_ON_ONCE(!auth_data))
3316                 return -EINVAL;
3317
3318         auth_data->tries++;
3319
3320         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3321                 sdata_info(sdata, "authentication with %pM timed out\n",
3322                            auth_data->bss->bssid);
3323
3324                 /*
3325                  * Most likely AP is not in the range so remove the
3326                  * bss struct for that AP.
3327                  */
3328                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3329
3330                 return -ETIMEDOUT;
3331         }
3332
3333         drv_mgd_prepare_tx(local, sdata);
3334
3335         if (auth_data->bss->proberesp_ies) {
3336                 u16 trans = 1;
3337                 u16 status = 0;
3338
3339                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3340                            auth_data->bss->bssid, auth_data->tries,
3341                            IEEE80211_AUTH_MAX_TRIES);
3342
3343                 auth_data->expected_transaction = 2;
3344
3345                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3346                         trans = auth_data->sae_trans;
3347                         status = auth_data->sae_status;
3348                         auth_data->expected_transaction = trans;
3349                 }
3350
3351                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3352                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3353                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3354
3355                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3356                                     auth_data->data, auth_data->data_len,
3357                                     auth_data->bss->bssid,
3358                                     auth_data->bss->bssid, NULL, 0, 0,
3359                                     tx_flags);
3360         } else {
3361                 const u8 *ssidie;
3362
3363                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3364                            auth_data->bss->bssid, auth_data->tries,
3365                            IEEE80211_AUTH_MAX_TRIES);
3366
3367                 rcu_read_lock();
3368                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3369                 if (!ssidie) {
3370                         rcu_read_unlock();
3371                         return -EINVAL;
3372                 }
3373                 /*
3374                  * Direct probe is sent to broadcast address as some APs
3375                  * will not answer to direct packet in unassociated state.
3376                  */
3377                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3378                                          NULL, 0, (u32) -1, true, 0,
3379                                          auth_data->bss->channel, false);
3380                 rcu_read_unlock();
3381         }
3382
3383         if (tx_flags == 0) {
3384                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3385                 auth_data->timeout_started = true;
3386                 run_again(sdata, auth_data->timeout);
3387         } else {
3388                 auth_data->timeout =
3389                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3390                 auth_data->timeout_started = true;
3391                 run_again(sdata, auth_data->timeout);
3392         }
3393
3394         return 0;
3395 }
3396
3397 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3398 {
3399         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3400         struct ieee80211_local *local = sdata->local;
3401
3402         sdata_assert_lock(sdata);
3403
3404         assoc_data->tries++;
3405         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3406                 sdata_info(sdata, "association with %pM timed out\n",
3407                            assoc_data->bss->bssid);
3408
3409                 /*
3410                  * Most likely AP is not in the range so remove the
3411                  * bss struct for that AP.
3412                  */
3413                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3414
3415                 return -ETIMEDOUT;
3416         }
3417
3418         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3419                    assoc_data->bss->bssid, assoc_data->tries,
3420                    IEEE80211_ASSOC_MAX_TRIES);
3421         ieee80211_send_assoc(sdata);
3422
3423         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3424                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3425                 assoc_data->timeout_started = true;
3426                 run_again(sdata, assoc_data->timeout);
3427         } else {
3428                 assoc_data->timeout =
3429                         round_jiffies_up(jiffies +
3430                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3431                 assoc_data->timeout_started = true;
3432                 run_again(sdata, assoc_data->timeout);
3433         }
3434
3435         return 0;
3436 }
3437
3438 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3439                                   __le16 fc, bool acked)
3440 {
3441         struct ieee80211_local *local = sdata->local;
3442
3443         sdata->u.mgd.status_fc = fc;
3444         sdata->u.mgd.status_acked = acked;
3445         sdata->u.mgd.status_received = true;
3446
3447         ieee80211_queue_work(&local->hw, &sdata->work);
3448 }
3449
3450 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3451 {
3452         struct ieee80211_local *local = sdata->local;
3453         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3454
3455         sdata_lock(sdata);
3456
3457         if (ifmgd->status_received) {
3458                 __le16 fc = ifmgd->status_fc;
3459                 bool status_acked = ifmgd->status_acked;
3460
3461                 ifmgd->status_received = false;
3462                 if (ifmgd->auth_data &&
3463                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3464                         if (status_acked) {
3465                                 ifmgd->auth_data->timeout =
3466                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3467                                 run_again(sdata, ifmgd->auth_data->timeout);
3468                         } else {
3469                                 ifmgd->auth_data->timeout = jiffies - 1;
3470                         }
3471                         ifmgd->auth_data->timeout_started = true;
3472                 } else if (ifmgd->assoc_data &&
3473                            (ieee80211_is_assoc_req(fc) ||
3474                             ieee80211_is_reassoc_req(fc))) {
3475                         if (status_acked) {
3476                                 ifmgd->assoc_data->timeout =
3477                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3478                                 run_again(sdata, ifmgd->assoc_data->timeout);
3479                         } else {
3480                                 ifmgd->assoc_data->timeout = jiffies - 1;
3481                         }
3482                         ifmgd->assoc_data->timeout_started = true;
3483                 }
3484         }
3485
3486         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3487             time_after(jiffies, ifmgd->auth_data->timeout)) {
3488                 if (ifmgd->auth_data->done) {
3489                         /*
3490                          * ok ... we waited for assoc but userspace didn't,
3491                          * so let's just kill the auth data
3492                          */
3493                         ieee80211_destroy_auth_data(sdata, false);
3494                 } else if (ieee80211_probe_auth(sdata)) {
3495                         u8 bssid[ETH_ALEN];
3496
3497                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3498
3499                         ieee80211_destroy_auth_data(sdata, false);
3500
3501                         cfg80211_auth_timeout(sdata->dev, bssid);
3502                 }
3503         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3504                 run_again(sdata, ifmgd->auth_data->timeout);
3505
3506         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3507             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3508                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3509                     ieee80211_do_assoc(sdata)) {
3510                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3511
3512                         ieee80211_destroy_assoc_data(sdata, false);
3513                         cfg80211_assoc_timeout(sdata->dev, bss);
3514                 }
3515         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3516                 run_again(sdata, ifmgd->assoc_data->timeout);
3517
3518         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3519             ifmgd->associated) {
3520                 u8 bssid[ETH_ALEN];
3521                 int max_tries;
3522
3523                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3524
3525                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3526                         max_tries = max_nullfunc_tries;
3527                 else
3528                         max_tries = max_probe_tries;
3529
3530                 /* ACK received for nullfunc probing frame */
3531                 if (!ifmgd->probe_send_count)
3532                         ieee80211_reset_ap_probe(sdata);
3533                 else if (ifmgd->nullfunc_failed) {
3534                         if (ifmgd->probe_send_count < max_tries) {
3535                                 mlme_dbg(sdata,
3536                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3537                                          bssid, ifmgd->probe_send_count,
3538                                          max_tries);
3539                                 ieee80211_mgd_probe_ap_send(sdata);
3540                         } else {
3541                                 mlme_dbg(sdata,
3542                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3543                                          bssid);
3544                                 ieee80211_sta_connection_lost(sdata, bssid,
3545                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3546                                         false);
3547                         }
3548                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3549                         run_again(sdata, ifmgd->probe_timeout);
3550                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3551                         mlme_dbg(sdata,
3552                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3553                                  bssid, probe_wait_ms);
3554                         ieee80211_sta_connection_lost(sdata, bssid,
3555                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3556                 } else if (ifmgd->probe_send_count < max_tries) {
3557                         mlme_dbg(sdata,
3558                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3559                                  bssid, probe_wait_ms,
3560                                  ifmgd->probe_send_count, max_tries);
3561                         ieee80211_mgd_probe_ap_send(sdata);
3562                 } else {
3563                         /*
3564                          * We actually lost the connection ... or did we?
3565                          * Let's make sure!
3566                          */
3567                         wiphy_debug(local->hw.wiphy,
3568                                     "%s: No probe response from AP %pM"
3569                                     " after %dms, disconnecting.\n",
3570                                     sdata->name,
3571                                     bssid, probe_wait_ms);
3572
3573                         ieee80211_sta_connection_lost(sdata, bssid,
3574                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3575                 }
3576         }
3577
3578         sdata_unlock(sdata);
3579 }
3580
3581 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3582 {
3583         struct ieee80211_sub_if_data *sdata =
3584                 (struct ieee80211_sub_if_data *) data;
3585         struct ieee80211_local *local = sdata->local;
3586
3587         if (local->quiescing)
3588                 return;
3589
3590         if (sdata->vif.csa_active)
3591                 return;
3592
3593         sdata->u.mgd.connection_loss = false;
3594         ieee80211_queue_work(&sdata->local->hw,
3595                              &sdata->u.mgd.beacon_connection_loss_work);
3596 }
3597
3598 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3599 {
3600         struct ieee80211_sub_if_data *sdata =
3601                 (struct ieee80211_sub_if_data *) data;
3602         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3603         struct ieee80211_local *local = sdata->local;
3604
3605         if (local->quiescing)
3606                 return;
3607
3608         if (sdata->vif.csa_active)
3609                 return;
3610
3611         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3612 }
3613
3614 static void ieee80211_sta_monitor_work(struct work_struct *work)
3615 {
3616         struct ieee80211_sub_if_data *sdata =
3617                 container_of(work, struct ieee80211_sub_if_data,
3618                              u.mgd.monitor_work);
3619
3620         ieee80211_mgd_probe_ap(sdata, false);
3621 }
3622
3623 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3624 {
3625         u32 flags;
3626
3627         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3628                 __ieee80211_stop_poll(sdata);
3629
3630                 /* let's probe the connection once */
3631                 flags = sdata->local->hw.flags;
3632                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3633                         ieee80211_queue_work(&sdata->local->hw,
3634                                              &sdata->u.mgd.monitor_work);
3635                 /* and do all the other regular work too */
3636                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3637         }
3638 }
3639
3640 #ifdef CONFIG_PM
3641 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3642 {
3643         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3644         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3645
3646         sdata_lock(sdata);
3647
3648         if (ifmgd->auth_data || ifmgd->assoc_data) {
3649                 const u8 *bssid = ifmgd->auth_data ?
3650                                 ifmgd->auth_data->bss->bssid :
3651                                 ifmgd->assoc_data->bss->bssid;
3652
3653                 /*
3654                  * If we are trying to authenticate / associate while suspending,
3655                  * cfg80211 won't know and won't actually abort those attempts,
3656                  * thus we need to do that ourselves.
3657                  */
3658                 ieee80211_send_deauth_disassoc(sdata, bssid,
3659                                                IEEE80211_STYPE_DEAUTH,
3660                                                WLAN_REASON_DEAUTH_LEAVING,
3661                                                false, frame_buf);
3662                 if (ifmgd->assoc_data)
3663                         ieee80211_destroy_assoc_data(sdata, false);
3664                 if (ifmgd->auth_data)
3665                         ieee80211_destroy_auth_data(sdata, false);
3666                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3667                                       IEEE80211_DEAUTH_FRAME_LEN);
3668         }
3669
3670         sdata_unlock(sdata);
3671 }
3672
3673 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3674 {
3675         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3676
3677         sdata_lock(sdata);
3678         if (!ifmgd->associated) {
3679                 sdata_unlock(sdata);
3680                 return;
3681         }
3682
3683         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3684                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3685                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3686                 ieee80211_sta_connection_lost(sdata,
3687                                               ifmgd->associated->bssid,
3688                                               WLAN_REASON_UNSPECIFIED,
3689                                               true);
3690                 sdata_unlock(sdata);
3691                 return;
3692         }
3693         sdata_unlock(sdata);
3694 }
3695 #endif
3696
3697 /* interface setup */
3698 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3699 {
3700         struct ieee80211_if_managed *ifmgd;
3701
3702         ifmgd = &sdata->u.mgd;
3703         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3704         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3705         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3706                   ieee80211_beacon_connection_loss_work);
3707         INIT_WORK(&ifmgd->csa_connection_drop_work,
3708                   ieee80211_csa_connection_drop_work);
3709         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3710         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
3711                           ieee80211_tdls_peer_del_work);
3712         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3713                     (unsigned long) sdata);
3714         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3715                     (unsigned long) sdata);
3716         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3717                     (unsigned long) sdata);
3718         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3719                     (unsigned long) sdata);
3720
3721         ifmgd->flags = 0;
3722         ifmgd->powersave = sdata->wdev.ps;
3723         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3724         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3725         ifmgd->p2p_noa_index = -1;
3726
3727         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3728                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3729         else
3730                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3731 }
3732
3733 /* scan finished notification */
3734 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3735 {
3736         struct ieee80211_sub_if_data *sdata;
3737
3738         /* Restart STA timers */
3739         rcu_read_lock();
3740         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3741                 if (ieee80211_sdata_running(sdata))
3742                         ieee80211_restart_sta_timer(sdata);
3743         }
3744         rcu_read_unlock();
3745 }
3746
3747 int ieee80211_max_network_latency(struct notifier_block *nb,
3748                                   unsigned long data, void *dummy)
3749 {
3750         s32 latency_usec = (s32) data;
3751         struct ieee80211_local *local =
3752                 container_of(nb, struct ieee80211_local,
3753                              network_latency_notifier);
3754
3755         mutex_lock(&local->iflist_mtx);
3756         ieee80211_recalc_ps(local, latency_usec);
3757         mutex_unlock(&local->iflist_mtx);
3758
3759         return NOTIFY_OK;
3760 }
3761
3762 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3763                                      struct cfg80211_bss *cbss)
3764 {
3765         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3766         const u8 *ht_cap_ie, *vht_cap_ie;
3767         const struct ieee80211_ht_cap *ht_cap;
3768         const struct ieee80211_vht_cap *vht_cap;
3769         u8 chains = 1;
3770
3771         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3772                 return chains;
3773
3774         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3775         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3776                 ht_cap = (void *)(ht_cap_ie + 2);
3777                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3778                 /*
3779                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3780                  *       "Tx Unequal Modulation Supported" fields.
3781                  */
3782         }
3783
3784         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3785                 return chains;
3786
3787         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3788         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3789                 u8 nss;
3790                 u16 tx_mcs_map;
3791
3792                 vht_cap = (void *)(vht_cap_ie + 2);
3793                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3794                 for (nss = 8; nss > 0; nss--) {
3795                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3796                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3797                                 break;
3798                 }
3799                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3800                 chains = max(chains, nss);
3801         }
3802
3803         return chains;
3804 }
3805
3806 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3807                                   struct cfg80211_bss *cbss)
3808 {
3809         struct ieee80211_local *local = sdata->local;
3810         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3811         const struct ieee80211_ht_operation *ht_oper = NULL;
3812         const struct ieee80211_vht_operation *vht_oper = NULL;
3813         struct ieee80211_supported_band *sband;
3814         struct cfg80211_chan_def chandef;
3815         int ret;
3816
3817         sband = local->hw.wiphy->bands[cbss->channel->band];
3818
3819         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3820                           IEEE80211_STA_DISABLE_80P80MHZ |
3821                           IEEE80211_STA_DISABLE_160MHZ);
3822
3823         rcu_read_lock();
3824
3825         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3826             sband->ht_cap.ht_supported) {
3827                 const u8 *ht_oper_ie, *ht_cap;
3828
3829                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3830                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3831                         ht_oper = (void *)(ht_oper_ie + 2);
3832
3833                 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3834                 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3835                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3836                         ht_oper = NULL;
3837                 }
3838         }
3839
3840         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3841             sband->vht_cap.vht_supported) {
3842                 const u8 *vht_oper_ie, *vht_cap;
3843
3844                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3845                                                    WLAN_EID_VHT_OPERATION);
3846                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3847                         vht_oper = (void *)(vht_oper_ie + 2);
3848                 if (vht_oper && !ht_oper) {
3849                         vht_oper = NULL;
3850                         sdata_info(sdata,
3851                                    "AP advertised VHT without HT, disabling both\n");
3852                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3853                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3854                 }
3855
3856                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3857                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3858                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3859                         vht_oper = NULL;
3860                 }
3861         }
3862
3863         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3864                                                      cbss->channel,
3865                                                      ht_oper, vht_oper,
3866                                                      &chandef, false);
3867
3868         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3869                                       local->rx_chains);
3870
3871         rcu_read_unlock();
3872
3873         /* will change later if needed */
3874         sdata->smps_mode = IEEE80211_SMPS_OFF;
3875
3876         mutex_lock(&local->mtx);
3877         /*
3878          * If this fails (possibly due to channel context sharing
3879          * on incompatible channels, e.g. 80+80 and 160 sharing the
3880          * same control channel) try to use a smaller bandwidth.
3881          */
3882         ret = ieee80211_vif_use_channel(sdata, &chandef,
3883                                         IEEE80211_CHANCTX_SHARED);
3884
3885         /* don't downgrade for 5 and 10 MHz channels, though. */
3886         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3887             chandef.width == NL80211_CHAN_WIDTH_10)
3888                 goto out;
3889
3890         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3891                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3892                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3893                                                 IEEE80211_CHANCTX_SHARED);
3894         }
3895  out:
3896         mutex_unlock(&local->mtx);
3897         return ret;
3898 }
3899
3900 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3901                                      struct cfg80211_bss *cbss, bool assoc)
3902 {
3903         struct ieee80211_local *local = sdata->local;
3904         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3905         struct ieee80211_bss *bss = (void *)cbss->priv;
3906         struct sta_info *new_sta = NULL;
3907         bool have_sta = false;
3908         int err;
3909
3910         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3911                 return -EINVAL;
3912
3913         if (assoc) {
3914                 rcu_read_lock();
3915                 have_sta = sta_info_get(sdata, cbss->bssid);
3916                 rcu_read_unlock();
3917         }
3918
3919         if (!have_sta) {
3920                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3921                 if (!new_sta)
3922                         return -ENOMEM;
3923         }
3924         if (new_sta) {
3925                 u32 rates = 0, basic_rates = 0;
3926                 bool have_higher_than_11mbit;
3927                 int min_rate = INT_MAX, min_rate_index = -1;
3928                 struct ieee80211_chanctx_conf *chanctx_conf;
3929                 struct ieee80211_supported_band *sband;
3930                 const struct cfg80211_bss_ies *ies;
3931                 int shift;
3932                 u32 rate_flags;
3933
3934                 sband = local->hw.wiphy->bands[cbss->channel->band];
3935
3936                 err = ieee80211_prep_channel(sdata, cbss);
3937                 if (err) {
3938                         sta_info_free(local, new_sta);
3939                         return -EINVAL;
3940                 }
3941                 shift = ieee80211_vif_get_shift(&sdata->vif);
3942
3943                 rcu_read_lock();
3944                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3945                 if (WARN_ON(!chanctx_conf)) {
3946                         rcu_read_unlock();
3947                         sta_info_free(local, new_sta);
3948                         return -EINVAL;
3949                 }
3950                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
3951                 rcu_read_unlock();
3952
3953                 ieee80211_get_rates(sband, bss->supp_rates,
3954                                     bss->supp_rates_len,
3955                                     &rates, &basic_rates,
3956                                     &have_higher_than_11mbit,
3957                                     &min_rate, &min_rate_index,
3958                                     shift, rate_flags);
3959
3960                 /*
3961                  * This used to be a workaround for basic rates missing
3962                  * in the association response frame. Now that we no
3963                  * longer use the basic rates from there, it probably
3964                  * doesn't happen any more, but keep the workaround so
3965                  * in case some *other* APs are buggy in different ways
3966                  * we can connect -- with a warning.
3967                  */
3968                 if (!basic_rates && min_rate_index >= 0) {
3969                         sdata_info(sdata,
3970                                    "No basic rates, using min rate instead\n");
3971                         basic_rates = BIT(min_rate_index);
3972                 }
3973
3974                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3975                 sdata->vif.bss_conf.basic_rates = basic_rates;
3976
3977                 /* cf. IEEE 802.11 9.2.12 */
3978                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3979                     have_higher_than_11mbit)
3980                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3981                 else
3982                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3983
3984                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3985
3986                 /* set timing information */
3987                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3988                 rcu_read_lock();
3989                 ies = rcu_dereference(cbss->beacon_ies);
3990                 if (ies) {
3991                         const u8 *tim_ie;
3992
3993                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3994                         sdata->vif.bss_conf.sync_device_ts =
3995                                 bss->device_ts_beacon;
3996                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3997                                                   ies->data, ies->len);
3998                         if (tim_ie && tim_ie[1] >= 2)
3999                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4000                         else
4001                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4002                 } else if (!(local->hw.flags &
4003                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4004                         ies = rcu_dereference(cbss->proberesp_ies);
4005                         /* must be non-NULL since beacon IEs were NULL */
4006                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4007                         sdata->vif.bss_conf.sync_device_ts =
4008                                 bss->device_ts_presp;
4009                         sdata->vif.bss_conf.sync_dtim_count = 0;
4010                 } else {
4011                         sdata->vif.bss_conf.sync_tsf = 0;
4012                         sdata->vif.bss_conf.sync_device_ts = 0;
4013                         sdata->vif.bss_conf.sync_dtim_count = 0;
4014                 }
4015                 rcu_read_unlock();
4016
4017                 /* tell driver about BSSID, basic rates and timing */
4018                 ieee80211_bss_info_change_notify(sdata,
4019                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4020                         BSS_CHANGED_BEACON_INT);
4021
4022                 if (assoc)
4023                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4024
4025                 err = sta_info_insert(new_sta);
4026                 new_sta = NULL;
4027                 if (err) {
4028                         sdata_info(sdata,
4029                                    "failed to insert STA entry for the AP (error %d)\n",
4030                                    err);
4031                         return err;
4032                 }
4033         } else
4034                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4035
4036         return 0;
4037 }
4038
4039 /* config hooks */
4040 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4041                        struct cfg80211_auth_request *req)
4042 {
4043         struct ieee80211_local *local = sdata->local;
4044         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4045         struct ieee80211_mgd_auth_data *auth_data;
4046         u16 auth_alg;
4047         int err;
4048
4049         /* prepare auth data structure */
4050
4051         switch (req->auth_type) {
4052         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4053                 auth_alg = WLAN_AUTH_OPEN;
4054                 break;
4055         case NL80211_AUTHTYPE_SHARED_KEY:
4056                 if (IS_ERR(local->wep_tx_tfm))
4057                         return -EOPNOTSUPP;
4058                 auth_alg = WLAN_AUTH_SHARED_KEY;
4059                 break;
4060         case NL80211_AUTHTYPE_FT:
4061                 auth_alg = WLAN_AUTH_FT;
4062                 break;
4063         case NL80211_AUTHTYPE_NETWORK_EAP:
4064                 auth_alg = WLAN_AUTH_LEAP;
4065                 break;
4066         case NL80211_AUTHTYPE_SAE:
4067                 auth_alg = WLAN_AUTH_SAE;
4068                 break;
4069         default:
4070                 return -EOPNOTSUPP;
4071         }
4072
4073         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4074                             req->ie_len, GFP_KERNEL);
4075         if (!auth_data)
4076                 return -ENOMEM;
4077
4078         auth_data->bss = req->bss;
4079
4080         if (req->sae_data_len >= 4) {
4081                 __le16 *pos = (__le16 *) req->sae_data;
4082                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4083                 auth_data->sae_status = le16_to_cpu(pos[1]);
4084                 memcpy(auth_data->data, req->sae_data + 4,
4085                        req->sae_data_len - 4);
4086                 auth_data->data_len += req->sae_data_len - 4;
4087         }
4088
4089         if (req->ie && req->ie_len) {
4090                 memcpy(&auth_data->data[auth_data->data_len],
4091                        req->ie, req->ie_len);
4092                 auth_data->data_len += req->ie_len;
4093         }
4094
4095         if (req->key && req->key_len) {
4096                 auth_data->key_len = req->key_len;
4097                 auth_data->key_idx = req->key_idx;
4098                 memcpy(auth_data->key, req->key, req->key_len);
4099         }
4100
4101         auth_data->algorithm = auth_alg;
4102
4103         /* try to authenticate/probe */
4104
4105         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4106             ifmgd->assoc_data) {
4107                 err = -EBUSY;
4108                 goto err_free;
4109         }
4110
4111         if (ifmgd->auth_data)
4112                 ieee80211_destroy_auth_data(sdata, false);
4113
4114         /* prep auth_data so we don't go into idle on disassoc */
4115         ifmgd->auth_data = auth_data;
4116
4117         if (ifmgd->associated) {
4118                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4119
4120                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4121                                        WLAN_REASON_UNSPECIFIED,
4122                                        false, frame_buf);
4123
4124                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4125                                       sizeof(frame_buf));
4126         }
4127
4128         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4129
4130         err = ieee80211_prep_connection(sdata, req->bss, false);
4131         if (err)
4132                 goto err_clear;
4133
4134         err = ieee80211_probe_auth(sdata);
4135         if (err) {
4136                 sta_info_destroy_addr(sdata, req->bss->bssid);
4137                 goto err_clear;
4138         }
4139
4140         /* hold our own reference */
4141         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4142         return 0;
4143
4144  err_clear:
4145         memset(ifmgd->bssid, 0, ETH_ALEN);
4146         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4147         ifmgd->auth_data = NULL;
4148  err_free:
4149         kfree(auth_data);
4150         return err;
4151 }
4152
4153 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4154                                         const u8 *wmm_param, int len)
4155 {
4156         const u8 *pos;
4157         size_t left;
4158
4159         if (len < 8)
4160                 return false;
4161
4162         if (wmm_param[5] != 1 /* version */)
4163                 return false;
4164
4165         pos = wmm_param + 8;
4166         left = len - 8;
4167
4168         for (; left >= 4; left -= 4, pos += 4) {
4169                 u8 aifsn = pos[0] & 0x0f;
4170                 u8 ecwmin = pos[1] & 0x0f;
4171                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4172                 int aci = (pos[0] >> 5) & 0x03;
4173
4174                 if (aifsn < 2) {
4175                         sdata_info(sdata,
4176                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4177                                    aifsn, aci);
4178                         return false;
4179                 }
4180                 if (ecwmin > ecwmax) {
4181                         sdata_info(sdata,
4182                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4183                                    ecwmin, ecwmax, aci);
4184                         return false;
4185                 }
4186         }
4187
4188         return true;
4189 }
4190
4191 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4192                         struct cfg80211_assoc_request *req)
4193 {
4194         struct ieee80211_local *local = sdata->local;
4195         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4196         struct ieee80211_bss *bss = (void *)req->bss->priv;
4197         struct ieee80211_mgd_assoc_data *assoc_data;
4198         const struct cfg80211_bss_ies *beacon_ies;
4199         struct ieee80211_supported_band *sband;
4200         const u8 *ssidie, *ht_ie, *vht_ie;
4201         int i, err;
4202
4203         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4204         if (!assoc_data)
4205                 return -ENOMEM;
4206
4207         rcu_read_lock();
4208         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4209         if (!ssidie) {
4210                 rcu_read_unlock();
4211                 kfree(assoc_data);
4212                 return -EINVAL;
4213         }
4214         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4215         assoc_data->ssid_len = ssidie[1];
4216         rcu_read_unlock();
4217
4218         if (ifmgd->associated) {
4219                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4220
4221                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4222                                        WLAN_REASON_UNSPECIFIED,
4223                                        false, frame_buf);
4224
4225                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4226                                       sizeof(frame_buf));
4227         }
4228
4229         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4230                 err = -EBUSY;
4231                 goto err_free;
4232         }
4233
4234         if (ifmgd->assoc_data) {
4235                 err = -EBUSY;
4236                 goto err_free;
4237         }
4238
4239         if (ifmgd->auth_data) {
4240                 bool match;
4241
4242                 /* keep sta info, bssid if matching */
4243                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4244                 ieee80211_destroy_auth_data(sdata, match);
4245         }
4246
4247         /* prepare assoc data */
4248
4249         ifmgd->beacon_crc_valid = false;
4250
4251         assoc_data->wmm = bss->wmm_used &&
4252                           (local->hw.queues >= IEEE80211_NUM_ACS);
4253         if (assoc_data->wmm) {
4254                 /* try to check validity of WMM params IE */
4255                 const struct cfg80211_bss_ies *ies;
4256                 const u8 *wp, *start, *end;
4257
4258                 rcu_read_lock();
4259                 ies = rcu_dereference(req->bss->ies);
4260                 start = ies->data;
4261                 end = start + ies->len;
4262
4263                 while (true) {
4264                         wp = cfg80211_find_vendor_ie(
4265                                 WLAN_OUI_MICROSOFT,
4266                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4267                                 start, end - start);
4268                         if (!wp)
4269                                 break;
4270                         start = wp + wp[1] + 2;
4271                         /* if this IE is too short, try the next */
4272                         if (wp[1] <= 4)
4273                                 continue;
4274                         /* if this IE is WMM params, we found what we wanted */
4275                         if (wp[6] == 1)
4276                                 break;
4277                 }
4278
4279                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4280                                                         wp[1] - 2)) {
4281                         assoc_data->wmm = false;
4282                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4283                 }
4284                 rcu_read_unlock();
4285         }
4286
4287         /*
4288          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4289          * We still associate in non-HT mode (11a/b/g) if any one of these
4290          * ciphers is configured as pairwise.
4291          * We can set this to true for non-11n hardware, that'll be checked
4292          * separately along with the peer capabilities.
4293          */
4294         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4295                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4296                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4297                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4298                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4299                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4300                         netdev_info(sdata->dev,
4301                                     "disabling HT/VHT due to WEP/TKIP use\n");
4302                 }
4303         }
4304
4305         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4306                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4307                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4308         }
4309
4310         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4311                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4312
4313         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4314         sband = local->hw.wiphy->bands[req->bss->channel->band];
4315         if (!sband->ht_cap.ht_supported ||
4316             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4317             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4318                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4319                 if (!bss->wmm_used &&
4320                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4321                         netdev_info(sdata->dev,
4322                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4323         }
4324
4325         /* disable VHT if we don't support it or the AP doesn't use WMM */
4326         if (!sband->vht_cap.vht_supported ||
4327             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4328             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4329                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4330                 if (!bss->wmm_used &&
4331                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4332                         netdev_info(sdata->dev,
4333                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4334         }
4335
4336         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4337         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4338                sizeof(ifmgd->ht_capa_mask));
4339
4340         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4341         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4342                sizeof(ifmgd->vht_capa_mask));
4343
4344         if (req->ie && req->ie_len) {
4345                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4346                 assoc_data->ie_len = req->ie_len;
4347         }
4348
4349         assoc_data->bss = req->bss;
4350
4351         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4352                 if (ifmgd->powersave)
4353                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4354                 else
4355                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4356         } else
4357                 sdata->smps_mode = ifmgd->req_smps;
4358
4359         assoc_data->capability = req->bss->capability;
4360         assoc_data->supp_rates = bss->supp_rates;
4361         assoc_data->supp_rates_len = bss->supp_rates_len;
4362
4363         rcu_read_lock();
4364         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4365         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4366                 assoc_data->ap_ht_param =
4367                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4368         else
4369                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4370         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4371         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4372                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4373                        sizeof(struct ieee80211_vht_cap));
4374         else
4375                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4376         rcu_read_unlock();
4377
4378         if (bss->wmm_used && bss->uapsd_supported &&
4379             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4380                 assoc_data->uapsd = true;
4381                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4382         } else {
4383                 assoc_data->uapsd = false;
4384                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4385         }
4386
4387         if (req->prev_bssid)
4388                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4389
4390         if (req->use_mfp) {
4391                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4392                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4393         } else {
4394                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4395                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4396         }
4397
4398         if (req->crypto.control_port)
4399                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4400         else
4401                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4402
4403         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4404         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4405         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4406                                                         sdata->vif.type);
4407
4408         /* kick off associate process */
4409
4410         ifmgd->assoc_data = assoc_data;
4411         ifmgd->dtim_period = 0;
4412         ifmgd->have_beacon = false;
4413
4414         err = ieee80211_prep_connection(sdata, req->bss, true);
4415         if (err)
4416                 goto err_clear;
4417
4418         rcu_read_lock();
4419         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4420
4421         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4422             !beacon_ies) {
4423                 /*
4424                  * Wait up to one beacon interval ...
4425                  * should this be more if we miss one?
4426                  */
4427                 sdata_info(sdata, "waiting for beacon from %pM\n",
4428                            ifmgd->bssid);
4429                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4430                 assoc_data->timeout_started = true;
4431                 assoc_data->need_beacon = true;
4432         } else if (beacon_ies) {
4433                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4434                                                     beacon_ies->data,
4435                                                     beacon_ies->len);
4436                 u8 dtim_count = 0;
4437
4438                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4439                         const struct ieee80211_tim_ie *tim;
4440                         tim = (void *)(tim_ie + 2);
4441                         ifmgd->dtim_period = tim->dtim_period;
4442                         dtim_count = tim->dtim_count;
4443                 }
4444                 ifmgd->have_beacon = true;
4445                 assoc_data->timeout = jiffies;
4446                 assoc_data->timeout_started = true;
4447
4448                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4449                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4450                         sdata->vif.bss_conf.sync_device_ts =
4451                                 bss->device_ts_beacon;
4452                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4453                 }
4454         } else {
4455                 assoc_data->timeout = jiffies;
4456                 assoc_data->timeout_started = true;
4457         }
4458         rcu_read_unlock();
4459
4460         run_again(sdata, assoc_data->timeout);
4461
4462         if (bss->corrupt_data) {
4463                 char *corrupt_type = "data";
4464                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4465                         if (bss->corrupt_data &
4466                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4467                                 corrupt_type = "beacon and probe response";
4468                         else
4469                                 corrupt_type = "beacon";
4470                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4471                         corrupt_type = "probe response";
4472                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4473                            corrupt_type);
4474         }
4475
4476         return 0;
4477  err_clear:
4478         memset(ifmgd->bssid, 0, ETH_ALEN);
4479         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4480         ifmgd->assoc_data = NULL;
4481  err_free:
4482         kfree(assoc_data);
4483         return err;
4484 }
4485
4486 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4487                          struct cfg80211_deauth_request *req)
4488 {
4489         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4490         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4491         bool tx = !req->local_state_change;
4492
4493         if (ifmgd->auth_data &&
4494             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4495                 sdata_info(sdata,
4496                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4497                            req->bssid, req->reason_code,
4498                            ieee80211_get_reason_code_string(req->reason_code));
4499
4500                 drv_mgd_prepare_tx(sdata->local, sdata);
4501                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4502                                                IEEE80211_STYPE_DEAUTH,
4503                                                req->reason_code, tx,
4504                                                frame_buf);
4505                 ieee80211_destroy_auth_data(sdata, false);
4506                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4507                                       IEEE80211_DEAUTH_FRAME_LEN);
4508
4509                 return 0;
4510         }
4511
4512         if (ifmgd->associated &&
4513             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4514                 sdata_info(sdata,
4515                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4516                            req->bssid, req->reason_code,
4517                            ieee80211_get_reason_code_string(req->reason_code));
4518
4519                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4520                                        req->reason_code, tx, frame_buf);
4521                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4522                                       IEEE80211_DEAUTH_FRAME_LEN);
4523                 return 0;
4524         }
4525
4526         return -ENOTCONN;
4527 }
4528
4529 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4530                            struct cfg80211_disassoc_request *req)
4531 {
4532         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4533         u8 bssid[ETH_ALEN];
4534         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4535
4536         /*
4537          * cfg80211 should catch this ... but it's racy since
4538          * we can receive a disassoc frame, process it, hand it
4539          * to cfg80211 while that's in a locked section already
4540          * trying to tell us that the user wants to disconnect.
4541          */
4542         if (ifmgd->associated != req->bss)
4543                 return -ENOLINK;
4544
4545         sdata_info(sdata,
4546                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4547                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4548
4549         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4550         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4551                                req->reason_code, !req->local_state_change,
4552                                frame_buf);
4553
4554         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4555                               IEEE80211_DEAUTH_FRAME_LEN);
4556
4557         return 0;
4558 }
4559
4560 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4561 {
4562         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4563
4564         /*
4565          * Make sure some work items will not run after this,
4566          * they will not do anything but might not have been
4567          * cancelled when disconnecting.
4568          */
4569         cancel_work_sync(&ifmgd->monitor_work);
4570         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4571         cancel_work_sync(&ifmgd->request_smps_work);
4572         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4573         cancel_work_sync(&ifmgd->chswitch_work);
4574         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4575
4576         sdata_lock(sdata);
4577         if (ifmgd->assoc_data) {
4578                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4579                 ieee80211_destroy_assoc_data(sdata, false);
4580                 cfg80211_assoc_timeout(sdata->dev, bss);
4581         }
4582         if (ifmgd->auth_data)
4583                 ieee80211_destroy_auth_data(sdata, false);
4584         del_timer_sync(&ifmgd->timer);
4585         sdata_unlock(sdata);
4586 }
4587
4588 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4589                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4590                                gfp_t gfp)
4591 {
4592         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4593
4594         trace_api_cqm_rssi_notify(sdata, rssi_event);
4595
4596         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4597 }
4598 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);