Pileus Git - ~andy/linux/blob - 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         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 135                 return;
 136
 137         mod_timer(&sdata->u.mgd.conn_mon_timer,
 138                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 139
 140         ifmgd->probe_send_count = 0;
 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
 535         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 536
 537         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 538         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 539
 540         /* determine capability flags */
 541         cap = vht_cap.cap;
 542
 543         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 544                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 545                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 546         }
 547
 548         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 549                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 550                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 551         }
 552
 553         /*
 554          * Some APs apparently get confused if our capabilities are better
 555          * than theirs, so restrict what we advertise in the assoc request.
 556          */
 557         if (!(ap_vht_cap->vht_cap_info &
 558                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 559                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 560
 561         /* reserve and fill IE */
 562         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 563         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 564 }
 565
 566 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 567 {
 568         struct ieee80211_local *local = sdata->local;
 569         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 570         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 571         struct sk_buff *skb;
 572         struct ieee80211_mgmt *mgmt;
 573         u8 *pos, qos_info;
 574         size_t offset = 0, noffset;
 575         int i, count, rates_len, supp_rates_len, shift;
 576         u16 capab;
 577         struct ieee80211_supported_band *sband;
 578         struct ieee80211_chanctx_conf *chanctx_conf;
 579         struct ieee80211_channel *chan;
 580         u32 rate_flags, rates = 0;
 581
 582         sdata_assert_lock(sdata);
 583
 584         rcu_read_lock();
 585         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 586         if (WARN_ON(!chanctx_conf)) {
 587                 rcu_read_unlock();
 588                 return;
 589         }
 590         chan = chanctx_conf->def.chan;
 591         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 592         rcu_read_unlock();
 593         sband = local->hw.wiphy->bands[chan->band];
 594         shift = ieee80211_vif_get_shift(&sdata->vif);
 595
 596         if (assoc_data->supp_rates_len) {
 597                 /*
 598                  * Get all rates supported by the device and the AP as
 599                  * some APs don't like getting a superset of their rates
 600                  * in the association request (e.g. D-Link DAP 1353 in
 601                  * b-only mode)...
 602                  */
 603                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 604                                                      assoc_data->supp_rates,
 605                                                      assoc_data->supp_rates_len,
 606                                                      &rates);
 607         } else {
 608                 /*
 609                  * In case AP not provide any supported rates information
 610                  * before association, we send information element(s) with
 611                  * all rates that we support.
 612                  */
 613                 rates_len = 0;
 614                 for (i = 0; i < sband->n_bitrates; i++) {
 615                         if ((rate_flags & sband->bitrates[i].flags)
 616                             != rate_flags)
 617                                 continue;
 618                         rates |= BIT(i);
 619                         rates_len++;
 620                 }
 621         }
 622
 623         skb = alloc_skb(local->hw.extra_tx_headroom +
 624                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 625                         2 + assoc_data->ssid_len + /* SSID */
 626                         4 + rates_len + /* (extended) rates */
 627                         4 + /* power capability */
 628                         2 + 2 * sband->n_channels + /* supported channels */
 629                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 630                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 631                         assoc_data->ie_len + /* extra IEs */
 632                         9, /* WMM */
 633                         GFP_KERNEL);
 634         if (!skb)
 635                 return;
 636
 637         skb_reserve(skb, local->hw.extra_tx_headroom);
 638
 639         capab = WLAN_CAPABILITY_ESS;
 640
 641         if (sband->band == IEEE80211_BAND_2GHZ) {
 642                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 643                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 644                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 645                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 646         }
 647
 648         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 649                 capab |= WLAN_CAPABILITY_PRIVACY;
 650
 651         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 652             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 653                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 654
 655         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 656         memset(mgmt, 0, 24);
 657         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 658         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 659         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 660
 661         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 662                 skb_put(skb, 10);
 663                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 664                                                   IEEE80211_STYPE_REASSOC_REQ);
 665                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 666                 mgmt->u.reassoc_req.listen_interval =
 667                                 cpu_to_le16(local->hw.conf.listen_interval);
 668                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 669                        ETH_ALEN);
 670         } else {
 671                 skb_put(skb, 4);
 672                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 673                                                   IEEE80211_STYPE_ASSOC_REQ);
 674                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 675                 mgmt->u.assoc_req.listen_interval =
 676                                 cpu_to_le16(local->hw.conf.listen_interval);
 677         }
 678
 679         /* SSID */
 680         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 681         *pos++ = WLAN_EID_SSID;
 682         *pos++ = assoc_data->ssid_len;
 683         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 684
 685         /* add all rates which were marked to be used above */
 686         supp_rates_len = rates_len;
 687         if (supp_rates_len > 8)
 688                 supp_rates_len = 8;
 689
 690         pos = skb_put(skb, supp_rates_len + 2);
 691         *pos++ = WLAN_EID_SUPP_RATES;
 692         *pos++ = supp_rates_len;
 693
 694         count = 0;
 695         for (i = 0; i < sband->n_bitrates; i++) {
 696                 if (BIT(i) & rates) {
 697                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 698                                                 5 * (1 << shift));
 699                         *pos++ = (u8) rate;
 700                         if (++count == 8)
 701                                 break;
 702                 }
 703         }
 704
 705         if (rates_len > count) {
 706                 pos = skb_put(skb, rates_len - count + 2);
 707                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 708                 *pos++ = rates_len - count;
 709
 710                 for (i++; i < sband->n_bitrates; i++) {
 711                         if (BIT(i) & rates) {
 712                                 int rate;
 713                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 714                                                     5 * (1 << shift));
 715                                 *pos++ = (u8) rate;
 716                         }
 717                 }
 718         }
 719
 720         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 721                 /* 1. power capabilities */
 722                 pos = skb_put(skb, 4);
 723                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 724                 *pos++ = 2;
 725                 *pos++ = 0; /* min tx power */
 726                  /* max tx power */
 727                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 728
 729                 /* 2. supported channels */
 730                 /* TODO: get this in reg domain format */
 731                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 732                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 733                 *pos++ = 2 * sband->n_channels;
 734                 for (i = 0; i < sband->n_channels; i++) {
 735                         *pos++ = ieee80211_frequency_to_channel(
 736                                         sband->channels[i].center_freq);
 737                         *pos++ = 1; /* one channel in the subband*/
 738                 }
 739         }
 740
 741         /* if present, add any custom IEs that go before HT */
 742         if (assoc_data->ie_len) {
 743                 static const u8 before_ht[] = {
 744                         WLAN_EID_SSID,
 745                         WLAN_EID_SUPP_RATES,
 746                         WLAN_EID_EXT_SUPP_RATES,
 747                         WLAN_EID_PWR_CAPABILITY,
 748                         WLAN_EID_SUPPORTED_CHANNELS,
 749                         WLAN_EID_RSN,
 750                         WLAN_EID_QOS_CAPA,
 751                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 752                         WLAN_EID_MOBILITY_DOMAIN,
 753                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 754                 };
 755                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 756                                              before_ht, ARRAY_SIZE(before_ht),
 757                                              offset);
 758                 pos = skb_put(skb, noffset - offset);
 759                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 760                 offset = noffset;
 761         }
 762
 763         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 764                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 765                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 766
 767         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 768                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 769                                     sband, chan, sdata->smps_mode);
 770
 771         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 772                 ieee80211_add_vht_ie(sdata, skb, sband,
 773                                      &assoc_data->ap_vht_cap);
 774
 775         /* if present, add any custom non-vendor IEs that go after HT */
 776         if (assoc_data->ie_len) {
 777                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 778                                                     assoc_data->ie_len,
 779                                                     offset);
 780                 pos = skb_put(skb, noffset - offset);
 781                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 782                 offset = noffset;
 783         }
 784
 785         if (assoc_data->wmm) {
 786                 if (assoc_data->uapsd) {
 787                         qos_info = ifmgd->uapsd_queues;
 788                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 789                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 790                 } else {
 791                         qos_info = 0;
 792                 }
 793
 794                 pos = skb_put(skb, 9);
 795                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 796                 *pos++ = 7; /* len */
 797                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 798                 *pos++ = 0x50;
 799                 *pos++ = 0xf2;
 800                 *pos++ = 2; /* WME */
 801                 *pos++ = 0; /* WME info */
 802                 *pos++ = 1; /* WME ver */
 803                 *pos++ = qos_info;
 804         }
 805
 806         /* add any remaining custom (i.e. vendor specific here) IEs */
 807         if (assoc_data->ie_len) {
 808                 noffset = assoc_data->ie_len;
 809                 pos = skb_put(skb, noffset - offset);
 810                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 811         }
 812
 813         drv_mgd_prepare_tx(local, sdata);
 814
 815         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 816         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 817                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 818                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 819         ieee80211_tx_skb(sdata, skb);
 820 }
 821
 822 void ieee80211_send_pspoll(struct ieee80211_local *local,
 823                            struct ieee80211_sub_if_data *sdata)
 824 {
 825         struct ieee80211_pspoll *pspoll;
 826         struct sk_buff *skb;
 827
 828         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 829         if (!skb)
 830                 return;
 831
 832         pspoll = (struct ieee80211_pspoll *) skb->data;
 833         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 834
 835         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 836         ieee80211_tx_skb(sdata, skb);
 837 }
 838
 839 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 840                              struct ieee80211_sub_if_data *sdata,
 841                              int powersave)
 842 {
 843         struct sk_buff *skb;
 844         struct ieee80211_hdr_3addr *nullfunc;
 845         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 846
 847         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 848         if (!skb)
 849                 return;
 850
 851         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 852         if (powersave)
 853                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 854
 855         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 856                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 857
 858         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 859                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 860
 861         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 862                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 863
 864         ieee80211_tx_skb(sdata, skb);
 865 }
 866
 867 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 868                                           struct ieee80211_sub_if_data *sdata)
 869 {
 870         struct sk_buff *skb;
 871         struct ieee80211_hdr *nullfunc;
 872         __le16 fc;
 873
 874         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 875                 return;
 876
 877         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 878         if (!skb)
 879                 return;
 880
 881         skb_reserve(skb, local->hw.extra_tx_headroom);
 882
 883         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 884         memset(nullfunc, 0, 30);
 885         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 886                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 887         nullfunc->frame_control = fc;
 888         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 889         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 890         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 891         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 892
 893         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 894         ieee80211_tx_skb(sdata, skb);
 895 }
 896
 897 /* spectrum management related things */
 898 static void ieee80211_chswitch_work(struct work_struct *work)
 899 {
 900         struct ieee80211_sub_if_data *sdata =
 901                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 902         struct ieee80211_local *local = sdata->local;
 903         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 904         u32 changed = 0;
 905         int ret;
 906
 907         if (!ieee80211_sdata_running(sdata))
 908                 return;
 909
 910         sdata_lock(sdata);
 911         if (!ifmgd->associated)
 912                 goto out;
 913
 914         mutex_lock(&local->mtx);
 915         ret = ieee80211_vif_change_channel(sdata, &changed);
 916         mutex_unlock(&local->mtx);
 917         if (ret) {
 918                 sdata_info(sdata,
 919                            "vif channel switch failed, disconnecting\n");
 920                 ieee80211_queue_work(&sdata->local->hw,
 921                                      &ifmgd->csa_connection_drop_work);
 922                 goto out;
 923         }
 924
 925         if (!local->use_chanctx) {
 926                 local->_oper_chandef = sdata->csa_chandef;
 927                 /* Call "hw_config" only if doing sw channel switch.
 928                  * Otherwise update the channel directly
 929                  */
 930                 if (!local->ops->channel_switch)
 931                         ieee80211_hw_config(local, 0);
 932                 else
 933                         local->hw.conf.chandef = local->_oper_chandef;
 934         }
 935
 936         /* XXX: shouldn't really modify cfg80211-owned data! */
 937         ifmgd->associated->channel = sdata->csa_chandef.chan;
 938
 939         /* XXX: wait for a beacon first? */
 940         ieee80211_wake_queues_by_reason(&local->hw,
 941                                         IEEE80211_MAX_QUEUE_MAP,
 942                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 943
 944         ieee80211_bss_info_change_notify(sdata, changed);
 945
 946  out:
 947         sdata->vif.csa_active = false;
 948         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 949         sdata_unlock(sdata);
 950 }
 951
 952 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 953 {
 954         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 955         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 956
 957         trace_api_chswitch_done(sdata, success);
 958         if (!success) {
 959                 sdata_info(sdata,
 960                            "driver channel switch failed, disconnecting\n");
 961                 ieee80211_queue_work(&sdata->local->hw,
 962                                      &ifmgd->csa_connection_drop_work);
 963         } else {
 964                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 965         }
 966 }
 967 EXPORT_SYMBOL(ieee80211_chswitch_done);
 968
 969 static void ieee80211_chswitch_timer(unsigned long data)
 970 {
 971         struct ieee80211_sub_if_data *sdata =
 972                 (struct ieee80211_sub_if_data *) data;
 973
 974         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
 975 }
 976
 977 static void
 978 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 979                                  u64 timestamp, struct ieee802_11_elems *elems,
 980                                  bool beacon)
 981 {
 982         struct ieee80211_local *local = sdata->local;
 983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 984         struct cfg80211_bss *cbss = ifmgd->associated;
 985         struct ieee80211_chanctx *chanctx;
 986         enum ieee80211_band current_band;
 987         struct ieee80211_csa_ie csa_ie;
 988         int res;
 989
 990         sdata_assert_lock(sdata);
 991
 992         if (!cbss)
 993                 return;
 994
 995         if (local->scanning)
 996                 return;
 997
 998         /* disregard subsequent announcements if we are already processing */
 999         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
1000                 return;
1001
1002         current_band = cbss->channel->band;
1003         memset(&csa_ie, 0, sizeof(csa_ie));
1004         res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
1005                                            ifmgd->flags,
1006                                            ifmgd->associated->bssid, &csa_ie);
1007         if (res < 0)
1008                 ieee80211_queue_work(&local->hw,
1009                                      &ifmgd->csa_connection_drop_work);
1010         if (res)
1011                 return;
1012
1013         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1014                                      IEEE80211_CHAN_DISABLED)) {
1015                 sdata_info(sdata,
1016                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1017                            ifmgd->associated->bssid,
1018                            csa_ie.chandef.chan->center_freq,
1019                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1020                            csa_ie.chandef.center_freq2);
1021                 ieee80211_queue_work(&local->hw,
1022                                      &ifmgd->csa_connection_drop_work);
1023                 return;
1024         }
1025
1026         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1027         sdata->vif.csa_active = true;
1028
1029         mutex_lock(&local->chanctx_mtx);
1030         if (local->use_chanctx) {
1031                 u32 num_chanctx = 0;
1032                 list_for_each_entry(chanctx, &local->chanctx_list, list)
1033                        num_chanctx++;
1034
1035                 if (num_chanctx > 1 ||
1036                     !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1037                         sdata_info(sdata,
1038                                    "not handling chan-switch with channel contexts\n");
1039                         ieee80211_queue_work(&local->hw,
1040                                              &ifmgd->csa_connection_drop_work);
1041                         mutex_unlock(&local->chanctx_mtx);
1042                         return;
1043                 }
1044         }
1045
1046         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1047                 ieee80211_queue_work(&local->hw,
1048                                      &ifmgd->csa_connection_drop_work);
1049                 mutex_unlock(&local->chanctx_mtx);
1050                 return;
1051         }
1052         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
1053                                struct ieee80211_chanctx, conf);
1054         if (chanctx->refcount > 1) {
1055                 sdata_info(sdata,
1056                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
1057                 ieee80211_queue_work(&local->hw,
1058                                      &ifmgd->csa_connection_drop_work);
1059                 mutex_unlock(&local->chanctx_mtx);
1060                 return;
1061         }
1062         mutex_unlock(&local->chanctx_mtx);
1063
1064         sdata->csa_chandef = csa_ie.chandef;
1065
1066         if (csa_ie.mode)
1067                 ieee80211_stop_queues_by_reason(&local->hw,
1068                                 IEEE80211_MAX_QUEUE_MAP,
1069                                 IEEE80211_QUEUE_STOP_REASON_CSA);
1070
1071         if (local->ops->channel_switch) {
1072                 /* use driver's channel switch callback */
1073                 struct ieee80211_channel_switch ch_switch = {
1074                         .timestamp = timestamp,
1075                         .block_tx = csa_ie.mode,
1076                         .chandef = csa_ie.chandef,
1077                         .count = csa_ie.count,
1078                 };
1079
1080                 drv_channel_switch(local, &ch_switch);
1081                 return;
1082         }
1083
1084         /* channel switch handled in software */
1085         if (csa_ie.count <= 1)
1086                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1087         else
1088                 mod_timer(&ifmgd->chswitch_timer,
1089                           TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1090 }
1091
1092 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1093                                        struct ieee80211_channel *channel,
1094                                        const u8 *country_ie, u8 country_ie_len,
1095                                        const u8 *pwr_constr_elem)
1096 {
1097         struct ieee80211_country_ie_triplet *triplet;
1098         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1099         int i, chan_pwr, chan_increment, new_ap_level;
1100         bool have_chan_pwr = false;
1101
1102         /* Invalid IE */
1103         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1104                 return 0;
1105
1106         triplet = (void *)(country_ie + 3);
1107         country_ie_len -= 3;
1108
1109         switch (channel->band) {
1110         default:
1111                 WARN_ON_ONCE(1);
1112                 /* fall through */
1113         case IEEE80211_BAND_2GHZ:
1114         case IEEE80211_BAND_60GHZ:
1115                 chan_increment = 1;
1116                 break;
1117         case IEEE80211_BAND_5GHZ:
1118                 chan_increment = 4;
1119                 break;
1120         }
1121
1122         /* find channel */
1123         while (country_ie_len >= 3) {
1124                 u8 first_channel = triplet->chans.first_channel;
1125
1126                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1127                         goto next;
1128
1129                 for (i = 0; i < triplet->chans.num_channels; i++) {
1130                         if (first_channel + i * chan_increment == chan) {
1131                                 have_chan_pwr = true;
1132                                 chan_pwr = triplet->chans.max_power;
1133                                 break;
1134                         }
1135                 }
1136                 if (have_chan_pwr)
1137                         break;
1138
1139  next:
1140                 triplet++;
1141                 country_ie_len -= 3;
1142         }
1143
1144         if (!have_chan_pwr)
1145                 return 0;
1146
1147         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1148
1149         if (sdata->ap_power_level == new_ap_level)
1150                 return 0;
1151
1152         sdata_info(sdata,
1153                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1154                    new_ap_level, chan_pwr, *pwr_constr_elem,
1155                    sdata->u.mgd.bssid);
1156         sdata->ap_power_level = new_ap_level;
1157         if (__ieee80211_recalc_txpower(sdata))
1158                 return BSS_CHANGED_TXPOWER;
1159         return 0;
1160 }
1161
1162 /* powersave */
1163 static void ieee80211_enable_ps(struct ieee80211_local *local,
1164                                 struct ieee80211_sub_if_data *sdata)
1165 {
1166         struct ieee80211_conf *conf = &local->hw.conf;
1167
1168         /*
1169          * If we are scanning right now then the parameters will
1170          * take effect when scan finishes.
1171          */
1172         if (local->scanning)
1173                 return;
1174
1175         if (conf->dynamic_ps_timeout > 0 &&
1176             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1177                 mod_timer(&local->dynamic_ps_timer, jiffies +
1178                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1179         } else {
1180                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1181                         ieee80211_send_nullfunc(local, sdata, 1);
1182
1183                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1184                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1185                         return;
1186
1187                 conf->flags |= IEEE80211_CONF_PS;
1188                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1189         }
1190 }
1191
1192 static void ieee80211_change_ps(struct ieee80211_local *local)
1193 {
1194         struct ieee80211_conf *conf = &local->hw.conf;
1195
1196         if (local->ps_sdata) {
1197                 ieee80211_enable_ps(local, local->ps_sdata);
1198         } else if (conf->flags & IEEE80211_CONF_PS) {
1199                 conf->flags &= ~IEEE80211_CONF_PS;
1200                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1201                 del_timer_sync(&local->dynamic_ps_timer);
1202                 cancel_work_sync(&local->dynamic_ps_enable_work);
1203         }
1204 }
1205
1206 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1207 {
1208         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1209         struct sta_info *sta = NULL;
1210         bool authorized = false;
1211
1212         if (!mgd->powersave)
1213                 return false;
1214
1215         if (mgd->broken_ap)
1216                 return false;
1217
1218         if (!mgd->associated)
1219                 return false;
1220
1221         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1222                 return false;
1223
1224         if (!mgd->have_beacon)
1225                 return false;
1226
1227         rcu_read_lock();
1228         sta = sta_info_get(sdata, mgd->bssid);
1229         if (sta)
1230                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1231         rcu_read_unlock();
1232
1233         return authorized;
1234 }
1235
1236 /* need to hold RTNL or interface lock */
1237 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1238 {
1239         struct ieee80211_sub_if_data *sdata, *found = NULL;
1240         int count = 0;
1241         int timeout;
1242
1243         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1244                 local->ps_sdata = NULL;
1245                 return;
1246         }
1247
1248         list_for_each_entry(sdata, &local->interfaces, list) {
1249                 if (!ieee80211_sdata_running(sdata))
1250                         continue;
1251                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1252                         /* If an AP vif is found, then disable PS
1253                          * by setting the count to zero thereby setting
1254                          * ps_sdata to NULL.
1255                          */
1256                         count = 0;
1257                         break;
1258                 }
1259                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1260                         continue;
1261                 found = sdata;
1262                 count++;
1263         }
1264
1265         if (count == 1 && ieee80211_powersave_allowed(found)) {
1266                 s32 beaconint_us;
1267
1268                 if (latency < 0)
1269                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1270
1271                 beaconint_us = ieee80211_tu_to_usec(
1272                                         found->vif.bss_conf.beacon_int);
1273
1274                 timeout = local->dynamic_ps_forced_timeout;
1275                 if (timeout < 0) {
1276                         /*
1277                          * Go to full PSM if the user configures a very low
1278                          * latency requirement.
1279                          * The 2000 second value is there for compatibility
1280                          * until the PM_QOS_NETWORK_LATENCY is configured
1281                          * with real values.
1282                          */
1283                         if (latency > (1900 * USEC_PER_MSEC) &&
1284                             latency != (2000 * USEC_PER_SEC))
1285                                 timeout = 0;
1286                         else
1287                                 timeout = 100;
1288                 }
1289                 local->hw.conf.dynamic_ps_timeout = timeout;
1290
1291                 if (beaconint_us > latency) {
1292                         local->ps_sdata = NULL;
1293                 } else {
1294                         int maxslp = 1;
1295                         u8 dtimper = found->u.mgd.dtim_period;
1296
1297                         /* If the TIM IE is invalid, pretend the value is 1 */
1298                         if (!dtimper)
1299                                 dtimper = 1;
1300                         else if (dtimper > 1)
1301                                 maxslp = min_t(int, dtimper,
1302                                                     latency / beaconint_us);
1303
1304                         local->hw.conf.max_sleep_period = maxslp;
1305                         local->hw.conf.ps_dtim_period = dtimper;
1306                         local->ps_sdata = found;
1307                 }
1308         } else {
1309                 local->ps_sdata = NULL;
1310         }
1311
1312         ieee80211_change_ps(local);
1313 }
1314
1315 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1316 {
1317         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1318
1319         if (sdata->vif.bss_conf.ps != ps_allowed) {
1320                 sdata->vif.bss_conf.ps = ps_allowed;
1321                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1322         }
1323 }
1324
1325 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1326 {
1327         struct ieee80211_local *local =
1328                 container_of(work, struct ieee80211_local,
1329                              dynamic_ps_disable_work);
1330
1331         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1332                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1333                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1334         }
1335
1336         ieee80211_wake_queues_by_reason(&local->hw,
1337                                         IEEE80211_MAX_QUEUE_MAP,
1338                                         IEEE80211_QUEUE_STOP_REASON_PS);
1339 }
1340
1341 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1342 {
1343         struct ieee80211_local *local =
1344                 container_of(work, struct ieee80211_local,
1345                              dynamic_ps_enable_work);
1346         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1347         struct ieee80211_if_managed *ifmgd;
1348         unsigned long flags;
1349         int q;
1350
1351         /* can only happen when PS was just disabled anyway */
1352         if (!sdata)
1353                 return;
1354
1355         ifmgd = &sdata->u.mgd;
1356
1357         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1358                 return;
1359
1360         if (local->hw.conf.dynamic_ps_timeout > 0) {
1361                 /* don't enter PS if TX frames are pending */
1362                 if (drv_tx_frames_pending(local)) {
1363                         mod_timer(&local->dynamic_ps_timer, jiffies +
1364                                   msecs_to_jiffies(
1365                                   local->hw.conf.dynamic_ps_timeout));
1366                         return;
1367                 }
1368
1369                 /*
1370                  * transmission can be stopped by others which leads to
1371                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1372                  * is not the actual idle state.
1373                  */
1374                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1375                 for (q = 0; q < local->hw.queues; q++) {
1376                         if (local->queue_stop_reasons[q]) {
1377                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1378                                                        flags);
1379                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1380                                           msecs_to_jiffies(
1381                                           local->hw.conf.dynamic_ps_timeout));
1382                                 return;
1383                         }
1384                 }
1385                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1386         }
1387
1388         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1389             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1390                 if (drv_tx_frames_pending(local)) {
1391                         mod_timer(&local->dynamic_ps_timer, jiffies +
1392                                   msecs_to_jiffies(
1393                                   local->hw.conf.dynamic_ps_timeout));
1394                 } else {
1395                         ieee80211_send_nullfunc(local, sdata, 1);
1396                         /* Flush to get the tx status of nullfunc frame */
1397                         ieee80211_flush_queues(local, sdata);
1398                 }
1399         }
1400
1401         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1402               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1403             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1404                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1405                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1406                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1407         }
1408 }
1409
1410 void ieee80211_dynamic_ps_timer(unsigned long data)
1411 {
1412         struct ieee80211_local *local = (void *) data;
1413
1414         if (local->quiescing || local->suspended)
1415                 return;
1416
1417         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1418 }
1419
1420 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1421 {
1422         struct delayed_work *delayed_work =
1423                 container_of(work, struct delayed_work, work);
1424         struct ieee80211_sub_if_data *sdata =
1425                 container_of(delayed_work, struct ieee80211_sub_if_data,
1426                              dfs_cac_timer_work);
1427         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1428
1429         mutex_lock(&sdata->local->mtx);
1430         if (sdata->wdev.cac_started) {
1431                 ieee80211_vif_release_channel(sdata);
1432                 cfg80211_cac_event(sdata->dev, &chandef,
1433                                    NL80211_RADAR_CAC_FINISHED,
1434                                    GFP_KERNEL);
1435         }
1436         mutex_unlock(&sdata->local->mtx);
1437 }
1438
1439 /* MLME */
1440 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1441                                      struct ieee80211_sub_if_data *sdata,
1442                                      const u8 *wmm_param, size_t wmm_param_len)
1443 {
1444         struct ieee80211_tx_queue_params params;
1445         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1446         size_t left;
1447         int count;
1448         const u8 *pos;
1449         u8 uapsd_queues = 0;
1450
1451         if (!local->ops->conf_tx)
1452                 return false;
1453
1454         if (local->hw.queues < IEEE80211_NUM_ACS)
1455                 return false;
1456
1457         if (!wmm_param)
1458                 return false;
1459
1460         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1461                 return false;
1462
1463         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1464                 uapsd_queues = ifmgd->uapsd_queues;
1465
1466         count = wmm_param[6] & 0x0f;
1467         if (count == ifmgd->wmm_last_param_set)
1468                 return false;
1469         ifmgd->wmm_last_param_set = count;
1470
1471         pos = wmm_param + 8;
1472         left = wmm_param_len - 8;
1473
1474         memset(&params, 0, sizeof(params));
1475
1476         sdata->wmm_acm = 0;
1477         for (; left >= 4; left -= 4, pos += 4) {
1478                 int aci = (pos[0] >> 5) & 0x03;
1479                 int acm = (pos[0] >> 4) & 0x01;
1480                 bool uapsd = false;
1481                 int queue;
1482
1483                 switch (aci) {
1484                 case 1: /* AC_BK */
1485                         queue = 3;
1486                         if (acm)
1487                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1488                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1489                                 uapsd = true;
1490                         break;
1491                 case 2: /* AC_VI */
1492                         queue = 1;
1493                         if (acm)
1494                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1495                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1496                                 uapsd = true;
1497                         break;
1498                 case 3: /* AC_VO */
1499                         queue = 0;
1500                         if (acm)
1501                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1502                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1503                                 uapsd = true;
1504                         break;
1505                 case 0: /* AC_BE */
1506                 default:
1507                         queue = 2;
1508                         if (acm)
1509                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1510                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1511                                 uapsd = true;
1512                         break;
1513                 }
1514
1515                 params.aifs = pos[0] & 0x0f;
1516                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1517                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1518                 params.txop = get_unaligned_le16(pos + 2);
1519                 params.acm = acm;
1520                 params.uapsd = uapsd;
1521
1522                 mlme_dbg(sdata,
1523                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1524                          queue, aci, acm,
1525                          params.aifs, params.cw_min, params.cw_max,
1526                          params.txop, params.uapsd);
1527                 sdata->tx_conf[queue] = params;
1528                 if (drv_conf_tx(local, sdata, queue, &params))
1529                         sdata_err(sdata,
1530                                   "failed to set TX queue parameters for queue %d\n",
1531                                   queue);
1532         }
1533
1534         /* enable WMM or activate new settings */
1535         sdata->vif.bss_conf.qos = true;
1536         return true;
1537 }
1538
1539 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1540 {
1541         lockdep_assert_held(&sdata->local->mtx);
1542
1543         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1544         ieee80211_run_deferred_scan(sdata->local);
1545 }
1546
1547 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1548 {
1549         mutex_lock(&sdata->local->mtx);
1550         __ieee80211_stop_poll(sdata);
1551         mutex_unlock(&sdata->local->mtx);
1552 }
1553
1554 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1555                                            u16 capab, bool erp_valid, u8 erp)
1556 {
1557         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1558         u32 changed = 0;
1559         bool use_protection;
1560         bool use_short_preamble;
1561         bool use_short_slot;
1562
1563         if (erp_valid) {
1564                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1565                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1566         } else {
1567                 use_protection = false;
1568                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1569         }
1570
1571         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1572         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1573                 use_short_slot = true;
1574
1575         if (use_protection != bss_conf->use_cts_prot) {
1576                 bss_conf->use_cts_prot = use_protection;
1577                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1578         }
1579
1580         if (use_short_preamble != bss_conf->use_short_preamble) {
1581                 bss_conf->use_short_preamble = use_short_preamble;
1582                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1583         }
1584
1585         if (use_short_slot != bss_conf->use_short_slot) {
1586                 bss_conf->use_short_slot = use_short_slot;
1587                 changed |= BSS_CHANGED_ERP_SLOT;
1588         }
1589
1590         return changed;
1591 }
1592
1593 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1594                                      struct cfg80211_bss *cbss,
1595                                      u32 bss_info_changed)
1596 {
1597         struct ieee80211_bss *bss = (void *)cbss->priv;
1598         struct ieee80211_local *local = sdata->local;
1599         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1600
1601         bss_info_changed |= BSS_CHANGED_ASSOC;
1602         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1603                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1604
1605         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1606                 beacon_loss_count * bss_conf->beacon_int));
1607
1608         sdata->u.mgd.associated = cbss;
1609         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1610
1611         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1612
1613         if (sdata->vif.p2p) {
1614                 const struct cfg80211_bss_ies *ies;
1615
1616                 rcu_read_lock();
1617                 ies = rcu_dereference(cbss->ies);
1618                 if (ies) {
1619                         int ret;
1620
1621                         ret = cfg80211_get_p2p_attr(
1622                                         ies->data, ies->len,
1623                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1624                                         (u8 *) &bss_conf->p2p_noa_attr,
1625                                         sizeof(bss_conf->p2p_noa_attr));
1626                         if (ret >= 2) {
1627                                 sdata->u.mgd.p2p_noa_index =
1628                                         bss_conf->p2p_noa_attr.index;
1629                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1630                         }
1631                 }
1632                 rcu_read_unlock();
1633         }
1634
1635         /* just to be sure */
1636         ieee80211_stop_poll(sdata);
1637
1638         ieee80211_led_assoc(local, 1);
1639
1640         if (sdata->u.mgd.have_beacon) {
1641                 /*
1642                  * If the AP is buggy we may get here with no DTIM period
1643                  * known, so assume it's 1 which is the only safe assumption
1644                  * in that case, although if the TIM IE is broken powersave
1645                  * probably just won't work at all.
1646                  */
1647                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1648                 bss_conf->beacon_rate = bss->beacon_rate;
1649                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1650         } else {
1651                 bss_conf->beacon_rate = NULL;
1652                 bss_conf->dtim_period = 0;
1653         }
1654
1655         bss_conf->assoc = 1;
1656
1657         /* Tell the driver to monitor connection quality (if supported) */
1658         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1659             bss_conf->cqm_rssi_thold)
1660                 bss_info_changed |= BSS_CHANGED_CQM;
1661
1662         /* Enable ARP filtering */
1663         if (bss_conf->arp_addr_cnt)
1664                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1665
1666         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1667
1668         mutex_lock(&local->iflist_mtx);
1669         ieee80211_recalc_ps(local, -1);
1670         mutex_unlock(&local->iflist_mtx);
1671
1672         ieee80211_recalc_smps(sdata);
1673         ieee80211_recalc_ps_vif(sdata);
1674
1675         netif_carrier_on(sdata->dev);
1676 }
1677
1678 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1679                                    u16 stype, u16 reason, bool tx,
1680                                    u8 *frame_buf)
1681 {
1682         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1683         struct ieee80211_local *local = sdata->local;
1684         u32 changed = 0;
1685
1686         sdata_assert_lock(sdata);
1687
1688         if (WARN_ON_ONCE(tx && !frame_buf))
1689                 return;
1690
1691         if (WARN_ON(!ifmgd->associated))
1692                 return;
1693
1694         ieee80211_stop_poll(sdata);
1695
1696         ifmgd->associated = NULL;
1697         netif_carrier_off(sdata->dev);
1698
1699         /*
1700          * if we want to get out of ps before disassoc (why?) we have
1701          * to do it before sending disassoc, as otherwise the null-packet
1702          * won't be valid.
1703          */
1704         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1705                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1706                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1707         }
1708         local->ps_sdata = NULL;
1709
1710         /* disable per-vif ps */
1711         ieee80211_recalc_ps_vif(sdata);
1712
1713         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1714         if (tx)
1715                 ieee80211_flush_queues(local, sdata);
1716
1717         /* deauthenticate/disassociate now */
1718         if (tx || frame_buf)
1719                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1720                                                reason, tx, frame_buf);
1721
1722         /* flush out frame */
1723         if (tx)
1724                 ieee80211_flush_queues(local, sdata);
1725
1726         /* clear bssid only after building the needed mgmt frames */
1727         memset(ifmgd->bssid, 0, ETH_ALEN);
1728
1729         /* remove AP and TDLS peers */
1730         sta_info_flush(sdata);
1731
1732         /* finally reset all BSS / config parameters */
1733         changed |= ieee80211_reset_erp_info(sdata);
1734
1735         ieee80211_led_assoc(local, 0);
1736         changed |= BSS_CHANGED_ASSOC;
1737         sdata->vif.bss_conf.assoc = false;
1738
1739         ifmgd->p2p_noa_index = -1;
1740         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1741                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1742
1743         /* on the next assoc, re-program HT/VHT parameters */
1744         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1745         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1746         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1747         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1748
1749         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1750
1751         del_timer_sync(&local->dynamic_ps_timer);
1752         cancel_work_sync(&local->dynamic_ps_enable_work);
1753
1754         /* Disable ARP filtering */
1755         if (sdata->vif.bss_conf.arp_addr_cnt)
1756                 changed |= BSS_CHANGED_ARP_FILTER;
1757
1758         sdata->vif.bss_conf.qos = false;
1759         changed |= BSS_CHANGED_QOS;
1760
1761         /* The BSSID (not really interesting) and HT changed */
1762         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1763         ieee80211_bss_info_change_notify(sdata, changed);
1764
1765         /* disassociated - set to defaults now */
1766         ieee80211_set_wmm_default(sdata, false);
1767
1768         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1769         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1770         del_timer_sync(&sdata->u.mgd.timer);
1771         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1772
1773         sdata->vif.bss_conf.dtim_period = 0;
1774         sdata->vif.bss_conf.beacon_rate = NULL;
1775
1776         ifmgd->have_beacon = false;
1777
1778         ifmgd->flags = 0;
1779         mutex_lock(&local->mtx);
1780         ieee80211_vif_release_channel(sdata);
1781         mutex_unlock(&local->mtx);
1782
1783         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1784 }
1785
1786 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1787                              struct ieee80211_hdr *hdr)
1788 {
1789         /*
1790          * We can postpone the mgd.timer whenever receiving unicast frames
1791          * from AP because we know that the connection is working both ways
1792          * at that time. But multicast frames (and hence also beacons) must
1793          * be ignored here, because we need to trigger the timer during
1794          * data idle periods for sending the periodic probe request to the
1795          * AP we're connected to.
1796          */
1797         if (is_multicast_ether_addr(hdr->addr1))
1798                 return;
1799
1800         ieee80211_sta_reset_conn_monitor(sdata);
1801 }
1802
1803 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1804 {
1805         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1806         struct ieee80211_local *local = sdata->local;
1807
1808         mutex_lock(&local->mtx);
1809         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
1810                 goto out;
1811
1812         __ieee80211_stop_poll(sdata);
1813
1814         mutex_lock(&local->iflist_mtx);
1815         ieee80211_recalc_ps(local, -1);
1816         mutex_unlock(&local->iflist_mtx);
1817
1818         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1819                 goto out;
1820
1821         /*
1822          * We've received a probe response, but are not sure whether
1823          * we have or will be receiving any beacons or data, so let's
1824          * schedule the timers again, just in case.
1825          */
1826         ieee80211_sta_reset_beacon_monitor(sdata);
1827
1828         mod_timer(&ifmgd->conn_mon_timer,
1829                   round_jiffies_up(jiffies +
1830                                    IEEE80211_CONNECTION_IDLE_TIME));
1831 out:
1832         mutex_unlock(&local->mtx);
1833 }
1834
1835 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1836                              struct ieee80211_hdr *hdr, bool ack)
1837 {
1838         if (!ieee80211_is_data(hdr->frame_control))
1839             return;
1840
1841         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1842             sdata->u.mgd.probe_send_count > 0) {
1843                 if (ack)
1844                         ieee80211_sta_reset_conn_monitor(sdata);
1845                 else
1846                         sdata->u.mgd.nullfunc_failed = true;
1847                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1848                 return;
1849         }
1850
1851         if (ack)
1852                 ieee80211_sta_reset_conn_monitor(sdata);
1853 }
1854
1855 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1856 {
1857         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1858         const u8 *ssid;
1859         u8 *dst = ifmgd->associated->bssid;
1860         u8 unicast_limit = max(1, max_probe_tries - 3);
1861
1862         /*
1863          * Try sending broadcast probe requests for the last three
1864          * probe requests after the first ones failed since some
1865          * buggy APs only support broadcast probe requests.
1866          */
1867         if (ifmgd->probe_send_count >= unicast_limit)
1868                 dst = NULL;
1869
1870         /*
1871          * When the hardware reports an accurate Tx ACK status, it's
1872          * better to send a nullfunc frame instead of a probe request,
1873          * as it will kick us off the AP quickly if we aren't associated
1874          * anymore. The timeout will be reset if the frame is ACKed by
1875          * the AP.
1876          */
1877         ifmgd->probe_send_count++;
1878
1879         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1880                 ifmgd->nullfunc_failed = false;
1881                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1882         } else {
1883                 int ssid_len;
1884
1885                 rcu_read_lock();
1886                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1887                 if (WARN_ON_ONCE(ssid == NULL))
1888                         ssid_len = 0;
1889                 else
1890                         ssid_len = ssid[1];
1891
1892                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1893                                          0, (u32) -1, true, 0,
1894                                          ifmgd->associated->channel, false);
1895                 rcu_read_unlock();
1896         }
1897
1898         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1899         run_again(sdata, ifmgd->probe_timeout);
1900         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1901                 ieee80211_flush_queues(sdata->local, sdata);
1902 }
1903
1904 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1905                                    bool beacon)
1906 {
1907         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1908         bool already = false;
1909
1910         if (!ieee80211_sdata_running(sdata))
1911                 return;
1912
1913         sdata_lock(sdata);
1914
1915         if (!ifmgd->associated)
1916                 goto out;
1917
1918         mutex_lock(&sdata->local->mtx);
1919
1920         if (sdata->local->tmp_channel || sdata->local->scanning) {
1921                 mutex_unlock(&sdata->local->mtx);
1922                 goto out;
1923         }
1924
1925         if (beacon) {
1926                 mlme_dbg_ratelimited(sdata,
1927                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
1928                                      beacon_loss_count);
1929
1930                 ieee80211_cqm_rssi_notify(&sdata->vif,
1931                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
1932                                           GFP_KERNEL);
1933         }
1934
1935         /*
1936          * The driver/our work has already reported this event or the
1937          * connection monitoring has kicked in and we have already sent
1938          * a probe request. Or maybe the AP died and the driver keeps
1939          * reporting until we disassociate...
1940          *
1941          * In either case we have to ignore the current call to this
1942          * function (except for setting the correct probe reason bit)
1943          * because otherwise we would reset the timer every time and
1944          * never check whether we received a probe response!
1945          */
1946         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
1947                 already = true;
1948
1949         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1950
1951         mutex_unlock(&sdata->local->mtx);
1952
1953         if (already)
1954                 goto out;
1955
1956         mutex_lock(&sdata->local->iflist_mtx);
1957         ieee80211_recalc_ps(sdata->local, -1);
1958         mutex_unlock(&sdata->local->iflist_mtx);
1959
1960         ifmgd->probe_send_count = 0;
1961         ieee80211_mgd_probe_ap_send(sdata);
1962  out:
1963         sdata_unlock(sdata);
1964 }
1965
1966 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1967                                           struct ieee80211_vif *vif)
1968 {
1969         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1970         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1971         struct cfg80211_bss *cbss;
1972         struct sk_buff *skb;
1973         const u8 *ssid;
1974         int ssid_len;
1975
1976         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1977                 return NULL;
1978
1979         sdata_assert_lock(sdata);
1980
1981         if (ifmgd->associated)
1982                 cbss = ifmgd->associated;
1983         else if (ifmgd->auth_data)
1984                 cbss = ifmgd->auth_data->bss;
1985         else if (ifmgd->assoc_data)
1986                 cbss = ifmgd->assoc_data->bss;
1987         else
1988                 return NULL;
1989
1990         rcu_read_lock();
1991         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1992         if (WARN_ON_ONCE(ssid == NULL))
1993                 ssid_len = 0;
1994         else
1995                 ssid_len = ssid[1];
1996
1997         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1998                                         (u32) -1, cbss->channel,
1999                                         ssid + 2, ssid_len,
2000                                         NULL, 0, true);
2001         rcu_read_unlock();
2002
2003         return skb;
2004 }
2005 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2006
2007 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2008 {
2009         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2010         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2011
2012         sdata_lock(sdata);
2013         if (!ifmgd->associated) {
2014                 sdata_unlock(sdata);
2015                 return;
2016         }
2017
2018         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2019                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2020                                true, frame_buf);
2021         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2022         sdata->vif.csa_active = false;
2023         ieee80211_wake_queues_by_reason(&sdata->local->hw,
2024                                         IEEE80211_MAX_QUEUE_MAP,
2025                                         IEEE80211_QUEUE_STOP_REASON_CSA);
2026
2027         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2028                               IEEE80211_DEAUTH_FRAME_LEN);
2029         sdata_unlock(sdata);
2030 }
2031
2032 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2033 {
2034         struct ieee80211_sub_if_data *sdata =
2035                 container_of(work, struct ieee80211_sub_if_data,
2036                              u.mgd.beacon_connection_loss_work);
2037         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2038         struct sta_info *sta;
2039
2040         if (ifmgd->associated) {
2041                 rcu_read_lock();
2042                 sta = sta_info_get(sdata, ifmgd->bssid);
2043                 if (sta)
2044                         sta->beacon_loss_count++;
2045                 rcu_read_unlock();
2046         }
2047
2048         if (ifmgd->connection_loss) {
2049                 sdata_info(sdata, "Connection to AP %pM lost\n",
2050                            ifmgd->bssid);
2051                 __ieee80211_disconnect(sdata);
2052         } else {
2053                 ieee80211_mgd_probe_ap(sdata, true);
2054         }
2055 }
2056
2057 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2058 {
2059         struct ieee80211_sub_if_data *sdata =
2060                 container_of(work, struct ieee80211_sub_if_data,
2061                              u.mgd.csa_connection_drop_work);
2062
2063         __ieee80211_disconnect(sdata);
2064 }
2065
2066 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2067 {
2068         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2069         struct ieee80211_hw *hw = &sdata->local->hw;
2070
2071         trace_api_beacon_loss(sdata);
2072
2073         sdata->u.mgd.connection_loss = false;
2074         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2075 }
2076 EXPORT_SYMBOL(ieee80211_beacon_loss);
2077
2078 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2079 {
2080         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2081         struct ieee80211_hw *hw = &sdata->local->hw;
2082
2083         trace_api_connection_loss(sdata);
2084
2085         sdata->u.mgd.connection_loss = true;
2086         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2087 }
2088 EXPORT_SYMBOL(ieee80211_connection_loss);
2089
2090
2091 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2092                                         bool assoc)
2093 {
2094         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2095
2096         sdata_assert_lock(sdata);
2097
2098         if (!assoc) {
2099                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2100
2101                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2102                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2103                 sdata->u.mgd.flags = 0;
2104                 mutex_lock(&sdata->local->mtx);
2105                 ieee80211_vif_release_channel(sdata);
2106                 mutex_unlock(&sdata->local->mtx);
2107         }
2108
2109         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2110         kfree(auth_data);
2111         sdata->u.mgd.auth_data = NULL;
2112 }
2113
2114 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2115                                      struct ieee80211_mgmt *mgmt, size_t len)
2116 {
2117         struct ieee80211_local *local = sdata->local;
2118         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2119         u8 *pos;
2120         struct ieee802_11_elems elems;
2121         u32 tx_flags = 0;
2122
2123         pos = mgmt->u.auth.variable;
2124         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2125         if (!elems.challenge)
2126                 return;
2127         auth_data->expected_transaction = 4;
2128         drv_mgd_prepare_tx(sdata->local, sdata);
2129         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2130                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2131                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2132         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2133                             elems.challenge - 2, elems.challenge_len + 2,
2134                             auth_data->bss->bssid, auth_data->bss->bssid,
2135                             auth_data->key, auth_data->key_len,
2136                             auth_data->key_idx, tx_flags);
2137 }
2138
2139 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2140                                    struct ieee80211_mgmt *mgmt, size_t len)
2141 {
2142         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2143         u8 bssid[ETH_ALEN];
2144         u16 auth_alg, auth_transaction, status_code;
2145         struct sta_info *sta;
2146
2147         sdata_assert_lock(sdata);
2148
2149         if (len < 24 + 6)
2150                 return;
2151
2152         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2153                 return;
2154
2155         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2156
2157         if (!ether_addr_equal(bssid, mgmt->bssid))
2158                 return;
2159
2160         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2161         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2162         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2163
2164         if (auth_alg != ifmgd->auth_data->algorithm ||
2165             auth_transaction != ifmgd->auth_data->expected_transaction) {
2166                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2167                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2168                            auth_transaction,
2169                            ifmgd->auth_data->expected_transaction);
2170                 return;
2171         }
2172
2173         if (status_code != WLAN_STATUS_SUCCESS) {
2174                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2175                            mgmt->sa, status_code);
2176                 ieee80211_destroy_auth_data(sdata, false);
2177                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2178                 return;
2179         }
2180
2181         switch (ifmgd->auth_data->algorithm) {
2182         case WLAN_AUTH_OPEN:
2183         case WLAN_AUTH_LEAP:
2184         case WLAN_AUTH_FT:
2185         case WLAN_AUTH_SAE:
2186                 break;
2187         case WLAN_AUTH_SHARED_KEY:
2188                 if (ifmgd->auth_data->expected_transaction != 4) {
2189                         ieee80211_auth_challenge(sdata, mgmt, len);
2190                         /* need another frame */
2191                         return;
2192                 }
2193                 break;
2194         default:
2195                 WARN_ONCE(1, "invalid auth alg %d",
2196                           ifmgd->auth_data->algorithm);
2197                 return;
2198         }
2199
2200         sdata_info(sdata, "authenticated\n");
2201         ifmgd->auth_data->done = true;
2202         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2203         ifmgd->auth_data->timeout_started = true;
2204         run_again(sdata, ifmgd->auth_data->timeout);
2205
2206         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2207             ifmgd->auth_data->expected_transaction != 2) {
2208                 /*
2209                  * Report auth frame to user space for processing since another
2210                  * round of Authentication frames is still needed.
2211                  */
2212                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2213                 return;
2214         }
2215
2216         /* move station state to auth */
2217         mutex_lock(&sdata->local->sta_mtx);
2218         sta = sta_info_get(sdata, bssid);
2219         if (!sta) {
2220                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2221                 goto out_err;
2222         }
2223         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2224                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2225                 goto out_err;
2226         }
2227         mutex_unlock(&sdata->local->sta_mtx);
2228
2229         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2230         return;
2231  out_err:
2232         mutex_unlock(&sdata->local->sta_mtx);
2233         /* ignore frame -- wait for timeout */
2234 }
2235
2236
2237 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2238                                      struct ieee80211_mgmt *mgmt, size_t len)
2239 {
2240         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2241         const u8 *bssid = NULL;
2242         u16 reason_code;
2243
2244         sdata_assert_lock(sdata);
2245
2246         if (len < 24 + 2)
2247                 return;
2248
2249         if (!ifmgd->associated ||
2250             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2251                 return;
2252
2253         bssid = ifmgd->associated->bssid;
2254
2255         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2256
2257         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2258                    bssid, reason_code);
2259
2260         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2261
2262         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2263 }
2264
2265
2266 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2267                                        struct ieee80211_mgmt *mgmt, size_t len)
2268 {
2269         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2270         u16 reason_code;
2271
2272         sdata_assert_lock(sdata);
2273
2274         if (len < 24 + 2)
2275                 return;
2276
2277         if (!ifmgd->associated ||
2278             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2279                 return;
2280
2281         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2282
2283         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2284                    mgmt->sa, reason_code);
2285
2286         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2287
2288         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2289 }
2290
2291 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2292                                 u8 *supp_rates, unsigned int supp_rates_len,
2293                                 u32 *rates, u32 *basic_rates,
2294                                 bool *have_higher_than_11mbit,
2295                                 int *min_rate, int *min_rate_index,
2296                                 int shift, u32 rate_flags)
2297 {
2298         int i, j;
2299
2300         for (i = 0; i < supp_rates_len; i++) {
2301                 int rate = supp_rates[i] & 0x7f;
2302                 bool is_basic = !!(supp_rates[i] & 0x80);
2303
2304                 if ((rate * 5 * (1 << shift)) > 110)
2305                         *have_higher_than_11mbit = true;
2306
2307                 /*
2308                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2309                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2310                  *
2311                  * Note: Even through the membership selector and the basic
2312                  *       rate flag share the same bit, they are not exactly
2313                  *       the same.
2314                  */
2315                 if (!!(supp_rates[i] & 0x80) &&
2316                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2317                         continue;
2318
2319                 for (j = 0; j < sband->n_bitrates; j++) {
2320                         struct ieee80211_rate *br;
2321                         int brate;
2322
2323                         br = &sband->bitrates[j];
2324                         if ((rate_flags & br->flags) != rate_flags)
2325                                 continue;
2326
2327                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2328                         if (brate == rate) {
2329                                 *rates |= BIT(j);
2330                                 if (is_basic)
2331                                         *basic_rates |= BIT(j);
2332                                 if ((rate * 5) < *min_rate) {
2333                                         *min_rate = rate * 5;
2334                                         *min_rate_index = j;
2335                                 }
2336                                 break;
2337                         }
2338                 }
2339         }
2340 }
2341
2342 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2343                                          bool assoc)
2344 {
2345         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2346
2347         sdata_assert_lock(sdata);
2348
2349         if (!assoc) {
2350                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2351
2352                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2353                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2354                 sdata->u.mgd.flags = 0;
2355                 mutex_lock(&sdata->local->mtx);
2356                 ieee80211_vif_release_channel(sdata);
2357                 mutex_unlock(&sdata->local->mtx);
2358         }
2359
2360         kfree(assoc_data);
2361         sdata->u.mgd.assoc_data = NULL;
2362 }
2363
2364 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2365                                     struct cfg80211_bss *cbss,
2366                                     struct ieee80211_mgmt *mgmt, size_t len)
2367 {
2368         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2369         struct ieee80211_local *local = sdata->local;
2370         struct ieee80211_supported_band *sband;
2371         struct sta_info *sta;
2372         u8 *pos;
2373         u16 capab_info, aid;
2374         struct ieee802_11_elems elems;
2375         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2376         const struct cfg80211_bss_ies *bss_ies = NULL;
2377         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2378         u32 changed = 0;
2379         int err;
2380         bool ret;
2381
2382         /* AssocResp and ReassocResp have identical structure */
2383
2384         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2385         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2386
2387         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2388                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2389                            aid);
2390         aid &= ~(BIT(15) | BIT(14));
2391
2392         ifmgd->broken_ap = false;
2393
2394         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2395                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2396                            aid);
2397                 aid = 0;
2398                 ifmgd->broken_ap = true;
2399         }
2400
2401         pos = mgmt->u.assoc_resp.variable;
2402         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2403
2404         if (!elems.supp_rates) {
2405                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2406                 return false;
2407         }
2408
2409         ifmgd->aid = aid;
2410
2411         /*
2412          * Some APs are erroneously not including some information in their
2413          * (re)association response frames. Try to recover by using the data
2414          * from the beacon or probe response. This seems to afflict mobile
2415          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2416          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2417          */
2418         if ((assoc_data->wmm && !elems.wmm_param) ||
2419             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2420              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2421             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2422              (!elems.vht_cap_elem || !elems.vht_operation))) {
2423                 const struct cfg80211_bss_ies *ies;
2424                 struct ieee802_11_elems bss_elems;
2425
2426                 rcu_read_lock();
2427                 ies = rcu_dereference(cbss->ies);
2428                 if (ies)
2429                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2430                                           GFP_ATOMIC);
2431                 rcu_read_unlock();
2432                 if (!bss_ies)
2433                         return false;
2434
2435                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2436                                        false, &bss_elems);
2437                 if (assoc_data->wmm &&
2438                     !elems.wmm_param && bss_elems.wmm_param) {
2439                         elems.wmm_param = bss_elems.wmm_param;
2440                         sdata_info(sdata,
2441                                    "AP bug: WMM param missing from AssocResp\n");
2442                 }
2443
2444                 /*
2445                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2446                  * have to include the IEs in the (re)association response.
2447                  */
2448                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2449                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2450                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2451                         sdata_info(sdata,
2452                                    "AP bug: HT capability missing from AssocResp\n");
2453                 }
2454                 if (!elems.ht_operation && bss_elems.ht_operation &&
2455                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2456                         elems.ht_operation = bss_elems.ht_operation;
2457                         sdata_info(sdata,
2458                                    "AP bug: HT operation missing from AssocResp\n");
2459                 }
2460                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2461                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2462                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2463                         sdata_info(sdata,
2464                                    "AP bug: VHT capa missing from AssocResp\n");
2465                 }
2466                 if (!elems.vht_operation && bss_elems.vht_operation &&
2467                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2468                         elems.vht_operation = bss_elems.vht_operation;
2469                         sdata_info(sdata,
2470                                    "AP bug: VHT operation missing from AssocResp\n");
2471                 }
2472         }
2473
2474         /*
2475          * We previously checked these in the beacon/probe response, so
2476          * they should be present here. This is just a safety net.
2477          */
2478         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2479             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2480                 sdata_info(sdata,
2481                            "HT AP is missing WMM params or HT capability/operation\n");
2482                 ret = false;
2483                 goto out;
2484         }
2485
2486         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2487             (!elems.vht_cap_elem || !elems.vht_operation)) {
2488                 sdata_info(sdata,
2489                            "VHT AP is missing VHT capability/operation\n");
2490                 ret = false;
2491                 goto out;
2492         }
2493
2494         mutex_lock(&sdata->local->sta_mtx);
2495         /*
2496          * station info was already allocated and inserted before
2497          * the association and should be available to us
2498          */
2499         sta = sta_info_get(sdata, cbss->bssid);
2500         if (WARN_ON(!sta)) {
2501                 mutex_unlock(&sdata->local->sta_mtx);
2502                 ret = false;
2503                 goto out;
2504         }
2505
2506         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2507
2508         /* Set up internal HT/VHT capabilities */
2509         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2510                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2511                                                   elems.ht_cap_elem, sta);
2512
2513         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2514                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2515                                                     elems.vht_cap_elem, sta);
2516
2517         /*
2518          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2519          * in their association response, so ignore that data for our own
2520          * configuration. If it changed since the last beacon, we'll get the
2521          * next beacon and update then.
2522          */
2523
2524         /*
2525          * If an operating mode notification IE is present, override the
2526          * NSS calculation (that would be done in rate_control_rate_init())
2527          * and use the # of streams from that element.
2528          */
2529         if (elems.opmode_notif &&
2530             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2531                 u8 nss;
2532
2533                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2534                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2535                 nss += 1;
2536                 sta->sta.rx_nss = nss;
2537         }
2538
2539         rate_control_rate_init(sta);
2540
2541         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2542                 set_sta_flag(sta, WLAN_STA_MFP);
2543
2544         if (elems.wmm_param)
2545                 set_sta_flag(sta, WLAN_STA_WME);
2546
2547         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2548         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2549                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2550         if (err) {
2551                 sdata_info(sdata,
2552                            "failed to move station %pM to desired state\n",
2553                            sta->sta.addr);
2554                 WARN_ON(__sta_info_destroy(sta));
2555                 mutex_unlock(&sdata->local->sta_mtx);
2556                 ret = false;
2557                 goto out;
2558         }
2559
2560         mutex_unlock(&sdata->local->sta_mtx);
2561
2562         /*
2563          * Always handle WMM once after association regardless
2564          * of the first value the AP uses. Setting -1 here has
2565          * that effect because the AP values is an unsigned
2566          * 4-bit value.
2567          */
2568         ifmgd->wmm_last_param_set = -1;
2569
2570         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2571                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2572                                          elems.wmm_param_len);
2573         else
2574                 ieee80211_set_wmm_default(sdata, false);
2575         changed |= BSS_CHANGED_QOS;
2576
2577         /* set AID and assoc capability,
2578          * ieee80211_set_associated() will tell the driver */
2579         bss_conf->aid = aid;
2580         bss_conf->assoc_capability = capab_info;
2581         ieee80211_set_associated(sdata, cbss, changed);
2582
2583         /*
2584          * If we're using 4-addr mode, let the AP know that we're
2585          * doing so, so that it can create the STA VLAN on its side
2586          */
2587         if (ifmgd->use_4addr)
2588                 ieee80211_send_4addr_nullfunc(local, sdata);
2589
2590         /*
2591          * Start timer to probe the connection to the AP now.
2592          * Also start the timer that will detect beacon loss.
2593          */
2594         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2595         ieee80211_sta_reset_beacon_monitor(sdata);
2596
2597         ret = true;
2598  out:
2599         kfree(bss_ies);
2600         return ret;
2601 }
2602
2603 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2604                                          struct ieee80211_mgmt *mgmt,
2605                                          size_t len)
2606 {
2607         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2608         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2609         u16 capab_info, status_code, aid;
2610         struct ieee802_11_elems elems;
2611         u8 *pos;
2612         bool reassoc;
2613         struct cfg80211_bss *bss;
2614
2615         sdata_assert_lock(sdata);
2616
2617         if (!assoc_data)
2618                 return;
2619         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2620                 return;
2621
2622         /*
2623          * AssocResp and ReassocResp have identical structure, so process both
2624          * of them in this function.
2625          */
2626
2627         if (len < 24 + 6)
2628                 return;
2629
2630         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2631         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2632         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2633         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2634
2635         sdata_info(sdata,
2636                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2637                    reassoc ? "Rea" : "A", mgmt->sa,
2638                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2639
2640         pos = mgmt->u.assoc_resp.variable;
2641         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2642
2643         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2644             elems.timeout_int &&
2645             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2646                 u32 tu, ms;
2647                 tu = le32_to_cpu(elems.timeout_int->value);
2648                 ms = tu * 1024 / 1000;
2649                 sdata_info(sdata,
2650                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2651                            mgmt->sa, tu, ms);
2652                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2653                 assoc_data->timeout_started = true;
2654                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2655                         run_again(sdata, assoc_data->timeout);
2656                 return;
2657         }
2658
2659         bss = assoc_data->bss;
2660
2661         if (status_code != WLAN_STATUS_SUCCESS) {
2662                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2663                            mgmt->sa, status_code);
2664                 ieee80211_destroy_assoc_data(sdata, false);
2665         } else {
2666                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2667                         /* oops -- internal error -- send timeout for now */
2668                         ieee80211_destroy_assoc_data(sdata, false);
2669                         cfg80211_assoc_timeout(sdata->dev, bss);
2670                         return;
2671                 }
2672                 sdata_info(sdata, "associated\n");
2673
2674                 /*
2675                  * destroy assoc_data afterwards, as otherwise an idle
2676                  * recalc after assoc_data is NULL but before associated
2677                  * is set can cause the interface to go idle
2678                  */
2679                 ieee80211_destroy_assoc_data(sdata, true);
2680         }
2681
2682         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
2683 }
2684
2685 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2686                                   struct ieee80211_mgmt *mgmt, size_t len,
2687                                   struct ieee80211_rx_status *rx_status,
2688                                   struct ieee802_11_elems *elems)
2689 {
2690         struct ieee80211_local *local = sdata->local;
2691         int freq;
2692         struct ieee80211_bss *bss;
2693         struct ieee80211_channel *channel;
2694
2695         sdata_assert_lock(sdata);
2696
2697         if (elems->ds_params)
2698                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2699                                                       rx_status->band);
2700         else
2701                 freq = rx_status->freq;
2702
2703         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2704
2705         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2706                 return;
2707
2708         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2709                                         channel);
2710         if (bss) {
2711                 ieee80211_rx_bss_put(local, bss);
2712                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2713         }
2714 }
2715
2716
2717 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2718                                          struct sk_buff *skb)
2719 {
2720         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2721         struct ieee80211_if_managed *ifmgd;
2722         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2723         size_t baselen, len = skb->len;
2724         struct ieee802_11_elems elems;
2725
2726         ifmgd = &sdata->u.mgd;
2727
2728         sdata_assert_lock(sdata);
2729
2730         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2731                 return; /* ignore ProbeResp to foreign address */
2732
2733         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2734         if (baselen > len)
2735                 return;
2736
2737         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2738                                false, &elems);
2739
2740         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2741
2742         if (ifmgd->associated &&
2743             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2744                 ieee80211_reset_ap_probe(sdata);
2745
2746         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2747             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2748                 /* got probe response, continue with auth */
2749                 sdata_info(sdata, "direct probe responded\n");
2750                 ifmgd->auth_data->tries = 0;
2751                 ifmgd->auth_data->timeout = jiffies;
2752                 ifmgd->auth_data->timeout_started = true;
2753                 run_again(sdata, ifmgd->auth_data->timeout);
2754         }
2755 }
2756
2757 /*
2758  * This is the canonical list of information elements we care about,
2759  * the filter code also gives us all changes to the Microsoft OUI
2760  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2761  *
2762  * We implement beacon filtering in software since that means we can
2763  * avoid processing the frame here and in cfg80211, and userspace
2764  * will not be able to tell whether the hardware supports it or not.
2765  *
2766  * XXX: This list needs to be dynamic -- userspace needs to be able to
2767  *      add items it requires. It also needs to be able to tell us to
2768  *      look out for other vendor IEs.
2769  */
2770 static const u64 care_about_ies =
2771         (1ULL << WLAN_EID_COUNTRY) |
2772         (1ULL << WLAN_EID_ERP_INFO) |
2773         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2774         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2775         (1ULL << WLAN_EID_HT_CAPABILITY) |
2776         (1ULL << WLAN_EID_HT_OPERATION);
2777
2778 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2779                                      struct ieee80211_mgmt *mgmt, size_t len,
2780                                      struct ieee80211_rx_status *rx_status)
2781 {
2782         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2783         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2784         size_t baselen;
2785         struct ieee802_11_elems elems;
2786         struct ieee80211_local *local = sdata->local;
2787         struct ieee80211_chanctx_conf *chanctx_conf;
2788         struct ieee80211_channel *chan;
2789         struct sta_info *sta;
2790         u32 changed = 0;
2791         bool erp_valid;
2792         u8 erp_value = 0;
2793         u32 ncrc;
2794         u8 *bssid;
2795         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2796
2797         sdata_assert_lock(sdata);
2798
2799         /* Process beacon from the current BSS */
2800         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2801         if (baselen > len)
2802                 return;
2803
2804         rcu_read_lock();
2805         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2806         if (!chanctx_conf) {
2807                 rcu_read_unlock();
2808                 return;
2809         }
2810
2811         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2812                 rcu_read_unlock();
2813                 return;
2814         }
2815         chan = chanctx_conf->def.chan;
2816         rcu_read_unlock();
2817
2818         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2819             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2820                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2821                                        len - baselen, false, &elems);
2822
2823                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2824                 if (elems.tim && !elems.parse_error) {
2825                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
2826                         ifmgd->dtim_period = tim_ie->dtim_period;
2827                 }
2828                 ifmgd->have_beacon = true;
2829                 ifmgd->assoc_data->need_beacon = false;
2830                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2831                         sdata->vif.bss_conf.sync_tsf =
2832                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2833                         sdata->vif.bss_conf.sync_device_ts =
2834                                 rx_status->device_timestamp;
2835                         if (elems.tim)
2836                                 sdata->vif.bss_conf.sync_dtim_count =
2837                                         elems.tim->dtim_count;
2838                         else
2839                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2840                 }
2841                 /* continue assoc process */
2842                 ifmgd->assoc_data->timeout = jiffies;
2843                 ifmgd->assoc_data->timeout_started = true;
2844                 run_again(sdata, ifmgd->assoc_data->timeout);
2845                 return;
2846         }
2847
2848         if (!ifmgd->associated ||
2849             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2850                 return;
2851         bssid = ifmgd->associated->bssid;
2852
2853         /* Track average RSSI from the Beacon frames of the current AP */
2854         ifmgd->last_beacon_signal = rx_status->signal;
2855         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2856                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2857                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2858                 ifmgd->last_cqm_event_signal = 0;
2859                 ifmgd->count_beacon_signal = 1;
2860                 ifmgd->last_ave_beacon_signal = 0;
2861         } else {
2862                 ifmgd->ave_beacon_signal =
2863                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2864                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2865                          ifmgd->ave_beacon_signal) / 16;
2866                 ifmgd->count_beacon_signal++;
2867         }
2868
2869         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2870             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2871                 int sig = ifmgd->ave_beacon_signal;
2872                 int last_sig = ifmgd->last_ave_beacon_signal;
2873
2874                 /*
2875                  * if signal crosses either of the boundaries, invoke callback
2876                  * with appropriate parameters
2877                  */
2878                 if (sig > ifmgd->rssi_max_thold &&
2879                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2880                         ifmgd->last_ave_beacon_signal = sig;
2881                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2882                 } else if (sig < ifmgd->rssi_min_thold &&
2883                            (last_sig >= ifmgd->rssi_max_thold ||
2884                            last_sig == 0)) {
2885                         ifmgd->last_ave_beacon_signal = sig;
2886                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2887                 }
2888         }
2889
2890         if (bss_conf->cqm_rssi_thold &&
2891             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2892             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2893                 int sig = ifmgd->ave_beacon_signal / 16;
2894                 int last_event = ifmgd->last_cqm_event_signal;
2895                 int thold = bss_conf->cqm_rssi_thold;
2896                 int hyst = bss_conf->cqm_rssi_hyst;
2897                 if (sig < thold &&
2898                     (last_event == 0 || sig < last_event - hyst)) {
2899                         ifmgd->last_cqm_event_signal = sig;
2900                         ieee80211_cqm_rssi_notify(
2901                                 &sdata->vif,
2902                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2903                                 GFP_KERNEL);
2904                 } else if (sig > thold &&
2905                            (last_event == 0 || sig > last_event + hyst)) {
2906                         ifmgd->last_cqm_event_signal = sig;
2907                         ieee80211_cqm_rssi_notify(
2908                                 &sdata->vif,
2909                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2910                                 GFP_KERNEL);
2911                 }
2912         }
2913
2914         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
2915                 mlme_dbg_ratelimited(sdata,
2916                                      "cancelling AP probe due to a received beacon\n");
2917                 ieee80211_reset_ap_probe(sdata);
2918         }
2919
2920         /*
2921          * Push the beacon loss detection into the future since
2922          * we are processing a beacon from the AP just now.
2923          */
2924         ieee80211_sta_reset_beacon_monitor(sdata);
2925
2926         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2927         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2928                                           len - baselen, false, &elems,
2929                                           care_about_ies, ncrc);
2930
2931         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2932                 bool directed_tim = ieee80211_check_tim(elems.tim,
2933                                                         elems.tim_len,
2934                                                         ifmgd->aid);
2935                 if (directed_tim) {
2936                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2937                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2938                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2939                                         ieee80211_hw_config(local,
2940                                                             IEEE80211_CONF_CHANGE_PS);
2941                                 }
2942                                 ieee80211_send_nullfunc(local, sdata, 0);
2943                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2944                                 local->pspolling = true;
2945
2946                                 /*
2947                                  * Here is assumed that the driver will be
2948                                  * able to send ps-poll frame and receive a
2949                                  * response even though power save mode is
2950                                  * enabled, but some drivers might require
2951                                  * to disable power save here. This needs
2952                                  * to be investigated.
2953                                  */
2954                                 ieee80211_send_pspoll(local, sdata);
2955                         }
2956                 }
2957         }
2958
2959         if (sdata->vif.p2p) {
2960                 struct ieee80211_p2p_noa_attr noa = {};
2961                 int ret;
2962
2963                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
2964                                             len - baselen,
2965                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2966                                             (u8 *) &noa, sizeof(noa));
2967                 if (ret >= 2) {
2968                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
2969                                 /* valid noa_attr and index changed */
2970                                 sdata->u.mgd.p2p_noa_index = noa.index;
2971                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
2972                                 changed |= BSS_CHANGED_P2P_PS;
2973                                 /*
2974                                  * make sure we update all information, the CRC
2975                                  * mechanism doesn't look at P2P attributes.
2976                                  */
2977                                 ifmgd->beacon_crc_valid = false;
2978                         }
2979                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
2980                         /* noa_attr not found and we had valid noa_attr before */
2981                         sdata->u.mgd.p2p_noa_index = -1;
2982                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
2983                         changed |= BSS_CHANGED_P2P_PS;
2984                         ifmgd->beacon_crc_valid = false;
2985                 }
2986         }
2987
2988         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2989                 return;
2990         ifmgd->beacon_crc = ncrc;
2991         ifmgd->beacon_crc_valid = true;
2992
2993         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2994
2995         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
2996                                          &elems, true);
2997
2998         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
2999             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3000                                      elems.wmm_param_len))
3001                 changed |= BSS_CHANGED_QOS;
3002
3003         /*
3004          * If we haven't had a beacon before, tell the driver about the
3005          * DTIM period (and beacon timing if desired) now.
3006          */
3007         if (!ifmgd->have_beacon) {
3008                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3009                 if (elems.tim)
3010                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3011                 else
3012                         bss_conf->dtim_period = 1;
3013
3014                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3015                         sdata->vif.bss_conf.sync_tsf =
3016                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3017                         sdata->vif.bss_conf.sync_device_ts =
3018                                 rx_status->device_timestamp;
3019                         if (elems.tim)
3020                                 sdata->vif.bss_conf.sync_dtim_count =
3021                                         elems.tim->dtim_count;
3022                         else
3023                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3024                 }
3025
3026                 changed |= BSS_CHANGED_BEACON_INFO;
3027                 ifmgd->have_beacon = true;
3028
3029                 mutex_lock(&local->iflist_mtx);
3030                 ieee80211_recalc_ps(local, -1);
3031                 mutex_unlock(&local->iflist_mtx);
3032
3033                 ieee80211_recalc_ps_vif(sdata);
3034         }
3035
3036         if (elems.erp_info) {
3037                 erp_valid = true;
3038                 erp_value = elems.erp_info[0];
3039         } else {
3040                 erp_valid = false;
3041         }
3042         changed |= ieee80211_handle_bss_capability(sdata,
3043                         le16_to_cpu(mgmt->u.beacon.capab_info),
3044                         erp_valid, erp_value);
3045
3046         mutex_lock(&local->sta_mtx);
3047         sta = sta_info_get(sdata, bssid);
3048
3049         if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
3050                                 elems.vht_operation, bssid, &changed)) {
3051                 mutex_unlock(&local->sta_mtx);
3052                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3053                                        WLAN_REASON_DEAUTH_LEAVING,
3054                                        true, deauth_buf);
3055                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3056                                       sizeof(deauth_buf));
3057                 return;
3058         }
3059
3060         if (sta && elems.opmode_notif)
3061                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3062                                             rx_status->band, true);
3063         mutex_unlock(&local->sta_mtx);
3064
3065         if (elems.country_elem && elems.pwr_constr_elem &&
3066             mgmt->u.probe_resp.capab_info &
3067                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3068                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3069                                                        elems.country_elem,
3070                                                        elems.country_elem_len,
3071                                                        elems.pwr_constr_elem);
3072
3073         ieee80211_bss_info_change_notify(sdata, changed);
3074 }
3075
3076 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3077                                   struct sk_buff *skb)
3078 {
3079         struct ieee80211_rx_status *rx_status;
3080         struct ieee80211_mgmt *mgmt;
3081         u16 fc;
3082         struct ieee802_11_elems elems;
3083         int ies_len;
3084
3085         rx_status = (struct ieee80211_rx_status *) skb->cb;
3086         mgmt = (struct ieee80211_mgmt *) skb->data;
3087         fc = le16_to_cpu(mgmt->frame_control);
3088
3089         sdata_lock(sdata);
3090
3091         switch (fc & IEEE80211_FCTL_STYPE) {
3092         case IEEE80211_STYPE_BEACON:
3093                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3094                 break;
3095         case IEEE80211_STYPE_PROBE_RESP:
3096                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3097                 break;
3098         case IEEE80211_STYPE_AUTH:
3099                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3100                 break;
3101         case IEEE80211_STYPE_DEAUTH:
3102                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3103                 break;
3104         case IEEE80211_STYPE_DISASSOC:
3105                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3106                 break;
3107         case IEEE80211_STYPE_ASSOC_RESP:
3108         case IEEE80211_STYPE_REASSOC_RESP:
3109                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3110                 break;
3111         case IEEE80211_STYPE_ACTION:
3112                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3113                         ies_len = skb->len -
3114                                   offsetof(struct ieee80211_mgmt,
3115                                            u.action.u.chan_switch.variable);
3116
3117                         if (ies_len < 0)
3118                                 break;
3119
3120                         ieee802_11_parse_elems(
3121                                 mgmt->u.action.u.chan_switch.variable,
3122                                 ies_len, true, &elems);
3123
3124                         if (elems.parse_error)
3125                                 break;
3126
3127                         ieee80211_sta_process_chanswitch(sdata,
3128                                                          rx_status->mactime,
3129                                                          &elems, false);
3130                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3131                         ies_len = skb->len -
3132                                   offsetof(struct ieee80211_mgmt,
3133                                            u.action.u.ext_chan_switch.variable);
3134
3135                         if (ies_len < 0)
3136                                 break;
3137
3138                         ieee802_11_parse_elems(
3139                                 mgmt->u.action.u.ext_chan_switch.variable,
3140                                 ies_len, true, &elems);
3141
3142                         if (elems.parse_error)
3143                                 break;
3144
3145                         /* for the handling code pretend this was also an IE */
3146                         elems.ext_chansw_ie =
3147                                 &mgmt->u.action.u.ext_chan_switch.data;
3148
3149                         ieee80211_sta_process_chanswitch(sdata,
3150                                                          rx_status->mactime,
3151                                                          &elems, false);
3152                 }
3153                 break;
3154         }
3155         sdata_unlock(sdata);
3156 }
3157
3158 static void ieee80211_sta_timer(unsigned long data)
3159 {
3160         struct ieee80211_sub_if_data *sdata =
3161                 (struct ieee80211_sub_if_data *) data;
3162
3163         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3164 }
3165
3166 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3167                                           u8 *bssid, u8 reason, bool tx)
3168 {
3169         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3170
3171         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3172                                tx, frame_buf);
3173
3174         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3175                               IEEE80211_DEAUTH_FRAME_LEN);
3176 }
3177
3178 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3179 {
3180         struct ieee80211_local *local = sdata->local;
3181         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3182         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3183         u32 tx_flags = 0;
3184
3185         sdata_assert_lock(sdata);
3186
3187         if (WARN_ON_ONCE(!auth_data))
3188                 return -EINVAL;
3189
3190         auth_data->tries++;
3191
3192         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3193                 sdata_info(sdata, "authentication with %pM timed out\n",
3194                            auth_data->bss->bssid);
3195
3196                 /*
3197                  * Most likely AP is not in the range so remove the
3198                  * bss struct for that AP.
3199                  */
3200                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3201
3202                 return -ETIMEDOUT;
3203         }
3204
3205         drv_mgd_prepare_tx(local, sdata);
3206
3207         if (auth_data->bss->proberesp_ies) {
3208                 u16 trans = 1;
3209                 u16 status = 0;
3210
3211                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3212                            auth_data->bss->bssid, auth_data->tries,
3213                            IEEE80211_AUTH_MAX_TRIES);
3214
3215                 auth_data->expected_transaction = 2;
3216
3217                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3218                         trans = auth_data->sae_trans;
3219                         status = auth_data->sae_status;
3220                         auth_data->expected_transaction = trans;
3221                 }
3222
3223                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3224                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3225                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3226
3227                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3228                                     auth_data->data, auth_data->data_len,
3229                                     auth_data->bss->bssid,
3230                                     auth_data->bss->bssid, NULL, 0, 0,
3231                                     tx_flags);
3232         } else {
3233                 const u8 *ssidie;
3234
3235                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3236                            auth_data->bss->bssid, auth_data->tries,
3237                            IEEE80211_AUTH_MAX_TRIES);
3238
3239                 rcu_read_lock();
3240                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3241                 if (!ssidie) {
3242                         rcu_read_unlock();
3243                         return -EINVAL;
3244                 }
3245                 /*
3246                  * Direct probe is sent to broadcast address as some APs
3247                  * will not answer to direct packet in unassociated state.
3248                  */
3249                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3250                                          NULL, 0, (u32) -1, true, 0,
3251                                          auth_data->bss->channel, false);
3252                 rcu_read_unlock();
3253         }
3254
3255         if (tx_flags == 0) {
3256                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3257                 auth_data->timeout_started = true;
3258                 run_again(sdata, auth_data->timeout);
3259         } else {
3260                 auth_data->timeout =
3261                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3262                 auth_data->timeout_started = true;
3263                 run_again(sdata, auth_data->timeout);
3264         }
3265
3266         return 0;
3267 }
3268
3269 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3270 {
3271         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3272         struct ieee80211_local *local = sdata->local;
3273
3274         sdata_assert_lock(sdata);
3275
3276         assoc_data->tries++;
3277         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3278                 sdata_info(sdata, "association with %pM timed out\n",
3279                            assoc_data->bss->bssid);
3280
3281                 /*
3282                  * Most likely AP is not in the range so remove the
3283                  * bss struct for that AP.
3284                  */
3285                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3286
3287                 return -ETIMEDOUT;
3288         }
3289
3290         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3291                    assoc_data->bss->bssid, assoc_data->tries,
3292                    IEEE80211_ASSOC_MAX_TRIES);
3293         ieee80211_send_assoc(sdata);
3294
3295         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3296                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3297                 assoc_data->timeout_started = true;
3298                 run_again(sdata, assoc_data->timeout);
3299         } else {
3300                 assoc_data->timeout =
3301                         round_jiffies_up(jiffies +
3302                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3303                 assoc_data->timeout_started = true;
3304                 run_again(sdata, assoc_data->timeout);
3305         }
3306
3307         return 0;
3308 }
3309
3310 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3311                                   __le16 fc, bool acked)
3312 {
3313         struct ieee80211_local *local = sdata->local;
3314
3315         sdata->u.mgd.status_fc = fc;
3316         sdata->u.mgd.status_acked = acked;
3317         sdata->u.mgd.status_received = true;
3318
3319         ieee80211_queue_work(&local->hw, &sdata->work);
3320 }
3321
3322 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3323 {
3324         struct ieee80211_local *local = sdata->local;
3325         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3326
3327         sdata_lock(sdata);
3328
3329         if (ifmgd->status_received) {
3330                 __le16 fc = ifmgd->status_fc;
3331                 bool status_acked = ifmgd->status_acked;
3332
3333                 ifmgd->status_received = false;
3334                 if (ifmgd->auth_data &&
3335                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3336                         if (status_acked) {
3337                                 ifmgd->auth_data->timeout =
3338                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3339                                 run_again(sdata, ifmgd->auth_data->timeout);
3340                         } else {
3341                                 ifmgd->auth_data->timeout = jiffies - 1;
3342                         }
3343                         ifmgd->auth_data->timeout_started = true;
3344                 } else if (ifmgd->assoc_data &&
3345                            (ieee80211_is_assoc_req(fc) ||
3346                             ieee80211_is_reassoc_req(fc))) {
3347                         if (status_acked) {
3348                                 ifmgd->assoc_data->timeout =
3349                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3350                                 run_again(sdata, ifmgd->assoc_data->timeout);
3351                         } else {
3352                                 ifmgd->assoc_data->timeout = jiffies - 1;
3353                         }
3354                         ifmgd->assoc_data->timeout_started = true;
3355                 }
3356         }
3357
3358         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3359             time_after(jiffies, ifmgd->auth_data->timeout)) {
3360                 if (ifmgd->auth_data->done) {
3361                         /*
3362                          * ok ... we waited for assoc but userspace didn't,
3363                          * so let's just kill the auth data
3364                          */
3365                         ieee80211_destroy_auth_data(sdata, false);
3366                 } else if (ieee80211_probe_auth(sdata)) {
3367                         u8 bssid[ETH_ALEN];
3368
3369                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3370
3371                         ieee80211_destroy_auth_data(sdata, false);
3372
3373                         cfg80211_auth_timeout(sdata->dev, bssid);
3374                 }
3375         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3376                 run_again(sdata, ifmgd->auth_data->timeout);
3377
3378         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3379             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3380                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3381                     ieee80211_do_assoc(sdata)) {
3382                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3383
3384                         ieee80211_destroy_assoc_data(sdata, false);
3385                         cfg80211_assoc_timeout(sdata->dev, bss);
3386                 }
3387         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3388                 run_again(sdata, ifmgd->assoc_data->timeout);
3389
3390         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3391             ifmgd->associated) {
3392                 u8 bssid[ETH_ALEN];
3393                 int max_tries;
3394
3395                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3396
3397                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3398                         max_tries = max_nullfunc_tries;
3399                 else
3400                         max_tries = max_probe_tries;
3401
3402                 /* ACK received for nullfunc probing frame */
3403                 if (!ifmgd->probe_send_count)
3404                         ieee80211_reset_ap_probe(sdata);
3405                 else if (ifmgd->nullfunc_failed) {
3406                         if (ifmgd->probe_send_count < max_tries) {
3407                                 mlme_dbg(sdata,
3408                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3409                                          bssid, ifmgd->probe_send_count,
3410                                          max_tries);
3411                                 ieee80211_mgd_probe_ap_send(sdata);
3412                         } else {
3413                                 mlme_dbg(sdata,
3414                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3415                                          bssid);
3416                                 ieee80211_sta_connection_lost(sdata, bssid,
3417                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3418                                         false);
3419                         }
3420                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3421                         run_again(sdata, ifmgd->probe_timeout);
3422                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3423                         mlme_dbg(sdata,
3424                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3425                                  bssid, probe_wait_ms);
3426                         ieee80211_sta_connection_lost(sdata, bssid,
3427                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3428                 } else if (ifmgd->probe_send_count < max_tries) {
3429                         mlme_dbg(sdata,
3430                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3431                                  bssid, probe_wait_ms,
3432                                  ifmgd->probe_send_count, max_tries);
3433                         ieee80211_mgd_probe_ap_send(sdata);
3434                 } else {
3435                         /*
3436                          * We actually lost the connection ... or did we?
3437                          * Let's make sure!
3438                          */
3439                         wiphy_debug(local->hw.wiphy,
3440                                     "%s: No probe response from AP %pM"
3441                                     " after %dms, disconnecting.\n",
3442                                     sdata->name,
3443                                     bssid, probe_wait_ms);
3444
3445                         ieee80211_sta_connection_lost(sdata, bssid,
3446                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3447                 }
3448         }
3449
3450         sdata_unlock(sdata);
3451 }
3452
3453 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3454 {
3455         struct ieee80211_sub_if_data *sdata =
3456                 (struct ieee80211_sub_if_data *) data;
3457         struct ieee80211_local *local = sdata->local;
3458
3459         if (local->quiescing)
3460                 return;
3461
3462         sdata->u.mgd.connection_loss = false;
3463         ieee80211_queue_work(&sdata->local->hw,
3464                              &sdata->u.mgd.beacon_connection_loss_work);
3465 }
3466
3467 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3468 {
3469         struct ieee80211_sub_if_data *sdata =
3470                 (struct ieee80211_sub_if_data *) data;
3471         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3472         struct ieee80211_local *local = sdata->local;
3473
3474         if (local->quiescing)
3475                 return;
3476
3477         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3478 }
3479
3480 static void ieee80211_sta_monitor_work(struct work_struct *work)
3481 {
3482         struct ieee80211_sub_if_data *sdata =
3483                 container_of(work, struct ieee80211_sub_if_data,
3484                              u.mgd.monitor_work);
3485
3486         ieee80211_mgd_probe_ap(sdata, false);
3487 }
3488
3489 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3490 {
3491         u32 flags;
3492
3493         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3494                 __ieee80211_stop_poll(sdata);
3495
3496                 /* let's probe the connection once */
3497                 flags = sdata->local->hw.flags;
3498                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3499                         ieee80211_queue_work(&sdata->local->hw,
3500                                              &sdata->u.mgd.monitor_work);
3501                 /* and do all the other regular work too */
3502                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3503         }
3504 }
3505
3506 #ifdef CONFIG_PM
3507 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3508 {
3509         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3510
3511         sdata_lock(sdata);
3512         if (!ifmgd->associated) {
3513                 sdata_unlock(sdata);
3514                 return;
3515         }
3516
3517         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3518                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3519                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3520                 ieee80211_sta_connection_lost(sdata,
3521                                               ifmgd->associated->bssid,
3522                                               WLAN_REASON_UNSPECIFIED,
3523                                               true);
3524                 sdata_unlock(sdata);
3525                 return;
3526         }
3527         sdata_unlock(sdata);
3528 }
3529 #endif
3530
3531 /* interface setup */
3532 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3533 {
3534         struct ieee80211_if_managed *ifmgd;
3535
3536         ifmgd = &sdata->u.mgd;
3537         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3538         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3539         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3540                   ieee80211_beacon_connection_loss_work);
3541         INIT_WORK(&ifmgd->csa_connection_drop_work,
3542                   ieee80211_csa_connection_drop_work);
3543         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3544         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3545                     (unsigned long) sdata);
3546         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3547                     (unsigned long) sdata);
3548         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3549                     (unsigned long) sdata);
3550         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3551                     (unsigned long) sdata);
3552
3553         ifmgd->flags = 0;
3554         ifmgd->powersave = sdata->wdev.ps;
3555         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3556         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3557         ifmgd->p2p_noa_index = -1;
3558
3559         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3560                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3561         else
3562                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3563 }
3564
3565 /* scan finished notification */
3566 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3567 {
3568         struct ieee80211_sub_if_data *sdata;
3569
3570         /* Restart STA timers */
3571         rcu_read_lock();
3572         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3573                 if (ieee80211_sdata_running(sdata))
3574                         ieee80211_restart_sta_timer(sdata);
3575         }
3576         rcu_read_unlock();
3577 }
3578
3579 int ieee80211_max_network_latency(struct notifier_block *nb,
3580                                   unsigned long data, void *dummy)
3581 {
3582         s32 latency_usec = (s32) data;
3583         struct ieee80211_local *local =
3584                 container_of(nb, struct ieee80211_local,
3585                              network_latency_notifier);
3586
3587         mutex_lock(&local->iflist_mtx);
3588         ieee80211_recalc_ps(local, latency_usec);
3589         mutex_unlock(&local->iflist_mtx);
3590
3591         return 0;
3592 }
3593
3594 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3595                                      struct cfg80211_bss *cbss)
3596 {
3597         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3598         const u8 *ht_cap_ie, *vht_cap_ie;
3599         const struct ieee80211_ht_cap *ht_cap;
3600         const struct ieee80211_vht_cap *vht_cap;
3601         u8 chains = 1;
3602
3603         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3604                 return chains;
3605
3606         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3607         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3608                 ht_cap = (void *)(ht_cap_ie + 2);
3609                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3610                 /*
3611                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3612                  *       "Tx Unequal Modulation Supported" fields.
3613                  */
3614         }
3615
3616         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3617                 return chains;
3618
3619         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3620         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3621                 u8 nss;
3622                 u16 tx_mcs_map;
3623
3624                 vht_cap = (void *)(vht_cap_ie + 2);
3625                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3626                 for (nss = 8; nss > 0; nss--) {
3627                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3628                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3629                                 break;
3630                 }
3631                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3632                 chains = max(chains, nss);
3633         }
3634
3635         return chains;
3636 }
3637
3638 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3639                                   struct cfg80211_bss *cbss)
3640 {
3641         struct ieee80211_local *local = sdata->local;
3642         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3643         const struct ieee80211_ht_operation *ht_oper = NULL;
3644         const struct ieee80211_vht_operation *vht_oper = NULL;
3645         struct ieee80211_supported_band *sband;
3646         struct cfg80211_chan_def chandef;
3647         int ret;
3648
3649         sband = local->hw.wiphy->bands[cbss->channel->band];
3650
3651         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3652                           IEEE80211_STA_DISABLE_80P80MHZ |
3653                           IEEE80211_STA_DISABLE_160MHZ);
3654
3655         rcu_read_lock();
3656
3657         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3658             sband->ht_cap.ht_supported) {
3659                 const u8 *ht_oper_ie, *ht_cap;
3660
3661                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3662                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3663                         ht_oper = (void *)(ht_oper_ie + 2);
3664
3665                 ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3666                 if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
3667                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3668                         ht_oper = NULL;
3669                 }
3670         }
3671
3672         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3673             sband->vht_cap.vht_supported) {
3674                 const u8 *vht_oper_ie, *vht_cap;
3675
3676                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3677                                                    WLAN_EID_VHT_OPERATION);
3678                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3679                         vht_oper = (void *)(vht_oper_ie + 2);
3680                 if (vht_oper && !ht_oper) {
3681                         vht_oper = NULL;
3682                         sdata_info(sdata,
3683                                    "AP advertised VHT without HT, disabling both\n");
3684                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3685                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3686                 }
3687
3688                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3689                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3690                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3691                         vht_oper = NULL;
3692                 }
3693         }
3694
3695         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3696                                                      cbss->channel,
3697                                                      ht_oper, vht_oper,
3698                                                      &chandef, false);
3699
3700         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3701                                       local->rx_chains);
3702
3703         rcu_read_unlock();
3704
3705         /* will change later if needed */
3706         sdata->smps_mode = IEEE80211_SMPS_OFF;
3707
3708         mutex_lock(&local->mtx);
3709         /*
3710          * If this fails (possibly due to channel context sharing
3711          * on incompatible channels, e.g. 80+80 and 160 sharing the
3712          * same control channel) try to use a smaller bandwidth.
3713          */
3714         ret = ieee80211_vif_use_channel(sdata, &chandef,
3715                                         IEEE80211_CHANCTX_SHARED);
3716
3717         /* don't downgrade for 5 and 10 MHz channels, though. */
3718         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3719             chandef.width == NL80211_CHAN_WIDTH_10)
3720                 goto out;
3721
3722         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3723                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3724                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3725                                                 IEEE80211_CHANCTX_SHARED);
3726         }
3727  out:
3728         mutex_unlock(&local->mtx);
3729         return ret;
3730 }
3731
3732 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3733                                      struct cfg80211_bss *cbss, bool assoc)
3734 {
3735         struct ieee80211_local *local = sdata->local;
3736         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3737         struct ieee80211_bss *bss = (void *)cbss->priv;
3738         struct sta_info *new_sta = NULL;
3739         bool have_sta = false;
3740         int err;
3741
3742         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3743                 return -EINVAL;
3744
3745         if (assoc) {
3746                 rcu_read_lock();
3747                 have_sta = sta_info_get(sdata, cbss->bssid);
3748                 rcu_read_unlock();
3749         }
3750
3751         if (!have_sta) {
3752                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3753                 if (!new_sta)
3754                         return -ENOMEM;
3755         }
3756         if (new_sta) {
3757                 u32 rates = 0, basic_rates = 0;
3758                 bool have_higher_than_11mbit;
3759                 int min_rate = INT_MAX, min_rate_index = -1;
3760                 struct ieee80211_chanctx_conf *chanctx_conf;
3761                 struct ieee80211_supported_band *sband;
3762                 const struct cfg80211_bss_ies *ies;
3763                 int shift;
3764                 u32 rate_flags;
3765
3766                 sband = local->hw.wiphy->bands[cbss->channel->band];
3767
3768                 err = ieee80211_prep_channel(sdata, cbss);
3769                 if (err) {
3770                         sta_info_free(local, new_sta);
3771                         return -EINVAL;
3772                 }
3773                 shift = ieee80211_vif_get_shift(&sdata->vif);
3774
3775                 rcu_read_lock();
3776                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3777                 if (WARN_ON(!chanctx_conf)) {
3778                         rcu_read_unlock();
3779                         sta_info_free(local, new_sta);
3780                         return -EINVAL;
3781                 }
3782                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
3783                 rcu_read_unlock();
3784
3785                 ieee80211_get_rates(sband, bss->supp_rates,
3786                                     bss->supp_rates_len,
3787                                     &rates, &basic_rates,
3788                                     &have_higher_than_11mbit,
3789                                     &min_rate, &min_rate_index,
3790                                     shift, rate_flags);
3791
3792                 /*
3793                  * This used to be a workaround for basic rates missing
3794                  * in the association response frame. Now that we no
3795                  * longer use the basic rates from there, it probably
3796                  * doesn't happen any more, but keep the workaround so
3797                  * in case some *other* APs are buggy in different ways
3798                  * we can connect -- with a warning.
3799                  */
3800                 if (!basic_rates && min_rate_index >= 0) {
3801                         sdata_info(sdata,
3802                                    "No basic rates, using min rate instead\n");
3803                         basic_rates = BIT(min_rate_index);
3804                 }
3805
3806                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3807                 sdata->vif.bss_conf.basic_rates = basic_rates;
3808
3809                 /* cf. IEEE 802.11 9.2.12 */
3810                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3811                     have_higher_than_11mbit)
3812                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3813                 else
3814                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3815
3816                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3817
3818                 /* set timing information */
3819                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3820                 rcu_read_lock();
3821                 ies = rcu_dereference(cbss->beacon_ies);
3822                 if (ies) {
3823                         const u8 *tim_ie;
3824
3825                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3826                         sdata->vif.bss_conf.sync_device_ts =
3827                                 bss->device_ts_beacon;
3828                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3829                                                   ies->data, ies->len);
3830                         if (tim_ie && tim_ie[1] >= 2)
3831                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
3832                         else
3833                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3834                 } else if (!(local->hw.flags &
3835                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
3836                         ies = rcu_dereference(cbss->proberesp_ies);
3837                         /* must be non-NULL since beacon IEs were NULL */
3838                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
3839                         sdata->vif.bss_conf.sync_device_ts =
3840                                 bss->device_ts_presp;
3841                         sdata->vif.bss_conf.sync_dtim_count = 0;
3842                 } else {
3843                         sdata->vif.bss_conf.sync_tsf = 0;
3844                         sdata->vif.bss_conf.sync_device_ts = 0;
3845                         sdata->vif.bss_conf.sync_dtim_count = 0;
3846                 }
3847                 rcu_read_unlock();
3848
3849                 /* tell driver about BSSID, basic rates and timing */
3850                 ieee80211_bss_info_change_notify(sdata,
3851                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3852                         BSS_CHANGED_BEACON_INT);
3853
3854                 if (assoc)
3855                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3856
3857                 err = sta_info_insert(new_sta);
3858                 new_sta = NULL;
3859                 if (err) {
3860                         sdata_info(sdata,
3861                                    "failed to insert STA entry for the AP (error %d)\n",
3862                                    err);
3863                         return err;
3864                 }
3865         } else
3866                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3867
3868         return 0;
3869 }
3870
3871 /* config hooks */
3872 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3873                        struct cfg80211_auth_request *req)
3874 {
3875         struct ieee80211_local *local = sdata->local;
3876         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3877         struct ieee80211_mgd_auth_data *auth_data;
3878         u16 auth_alg;
3879         int err;
3880
3881         /* prepare auth data structure */
3882
3883         switch (req->auth_type) {
3884         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3885                 auth_alg = WLAN_AUTH_OPEN;
3886                 break;
3887         case NL80211_AUTHTYPE_SHARED_KEY:
3888                 if (IS_ERR(local->wep_tx_tfm))
3889                         return -EOPNOTSUPP;
3890                 auth_alg = WLAN_AUTH_SHARED_KEY;
3891                 break;
3892         case NL80211_AUTHTYPE_FT:
3893                 auth_alg = WLAN_AUTH_FT;
3894                 break;
3895         case NL80211_AUTHTYPE_NETWORK_EAP:
3896                 auth_alg = WLAN_AUTH_LEAP;
3897                 break;
3898         case NL80211_AUTHTYPE_SAE:
3899                 auth_alg = WLAN_AUTH_SAE;
3900                 break;
3901         default:
3902                 return -EOPNOTSUPP;
3903         }
3904
3905         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3906                             req->ie_len, GFP_KERNEL);
3907         if (!auth_data)
3908                 return -ENOMEM;
3909
3910         auth_data->bss = req->bss;
3911
3912         if (req->sae_data_len >= 4) {
3913                 __le16 *pos = (__le16 *) req->sae_data;
3914                 auth_data->sae_trans = le16_to_cpu(pos[0]);
3915                 auth_data->sae_status = le16_to_cpu(pos[1]);
3916                 memcpy(auth_data->data, req->sae_data + 4,
3917                        req->sae_data_len - 4);
3918                 auth_data->data_len += req->sae_data_len - 4;
3919         }
3920
3921         if (req->ie && req->ie_len) {
3922                 memcpy(&auth_data->data[auth_data->data_len],
3923                        req->ie, req->ie_len);
3924                 auth_data->data_len += req->ie_len;
3925         }
3926
3927         if (req->key && req->key_len) {
3928                 auth_data->key_len = req->key_len;
3929                 auth_data->key_idx = req->key_idx;
3930                 memcpy(auth_data->key, req->key, req->key_len);
3931         }
3932
3933         auth_data->algorithm = auth_alg;
3934
3935         /* try to authenticate/probe */
3936
3937         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3938             ifmgd->assoc_data) {
3939                 err = -EBUSY;
3940                 goto err_free;
3941         }
3942
3943         if (ifmgd->auth_data)
3944                 ieee80211_destroy_auth_data(sdata, false);
3945
3946         /* prep auth_data so we don't go into idle on disassoc */
3947         ifmgd->auth_data = auth_data;
3948
3949         if (ifmgd->associated) {
3950                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3951
3952                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3953                                        WLAN_REASON_UNSPECIFIED,
3954                                        false, frame_buf);
3955
3956                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3957                                       sizeof(frame_buf));
3958         }
3959
3960         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3961
3962         err = ieee80211_prep_connection(sdata, req->bss, false);
3963         if (err)
3964                 goto err_clear;
3965
3966         err = ieee80211_probe_auth(sdata);
3967         if (err) {
3968                 sta_info_destroy_addr(sdata, req->bss->bssid);
3969                 goto err_clear;
3970         }
3971
3972         /* hold our own reference */
3973         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
3974         return 0;
3975
3976  err_clear:
3977         memset(ifmgd->bssid, 0, ETH_ALEN);
3978         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3979         ifmgd->auth_data = NULL;
3980  err_free:
3981         kfree(auth_data);
3982         return err;
3983 }
3984
3985 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
3986                                         const u8 *wmm_param, int len)
3987 {
3988         const u8 *pos;
3989         size_t left;
3990
3991         if (len < 8)
3992                 return false;
3993
3994         if (wmm_param[5] != 1 /* version */)
3995                 return false;
3996
3997         pos = wmm_param + 8;
3998         left = len - 8;
3999
4000         for (; left >= 4; left -= 4, pos += 4) {
4001                 u8 aifsn = pos[0] & 0x0f;
4002                 u8 ecwmin = pos[1] & 0x0f;
4003                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4004                 int aci = (pos[0] >> 5) & 0x03;
4005
4006                 if (aifsn < 2) {
4007                         sdata_info(sdata,
4008                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4009                                    aifsn, aci);
4010                         return false;
4011                 }
4012                 if (ecwmin > ecwmax) {
4013                         sdata_info(sdata,
4014                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4015                                    ecwmin, ecwmax, aci);
4016                         return false;
4017                 }
4018         }
4019
4020         return true;
4021 }
4022
4023 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4024                         struct cfg80211_assoc_request *req)
4025 {
4026         struct ieee80211_local *local = sdata->local;
4027         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4028         struct ieee80211_bss *bss = (void *)req->bss->priv;
4029         struct ieee80211_mgd_assoc_data *assoc_data;
4030         const struct cfg80211_bss_ies *beacon_ies;
4031         struct ieee80211_supported_band *sband;
4032         const u8 *ssidie, *ht_ie, *vht_ie;
4033         int i, err;
4034
4035         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4036         if (!assoc_data)
4037                 return -ENOMEM;
4038
4039         rcu_read_lock();
4040         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4041         if (!ssidie) {
4042                 rcu_read_unlock();
4043                 kfree(assoc_data);
4044                 return -EINVAL;
4045         }
4046         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4047         assoc_data->ssid_len = ssidie[1];
4048         rcu_read_unlock();
4049
4050         if (ifmgd->associated) {
4051                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4052
4053                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4054                                        WLAN_REASON_UNSPECIFIED,
4055                                        false, frame_buf);
4056
4057                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4058                                       sizeof(frame_buf));
4059         }
4060
4061         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4062                 err = -EBUSY;
4063                 goto err_free;
4064         }
4065
4066         if (ifmgd->assoc_data) {
4067                 err = -EBUSY;
4068                 goto err_free;
4069         }
4070
4071         if (ifmgd->auth_data) {
4072                 bool match;
4073
4074                 /* keep sta info, bssid if matching */
4075                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4076                 ieee80211_destroy_auth_data(sdata, match);
4077         }
4078
4079         /* prepare assoc data */
4080
4081         ifmgd->beacon_crc_valid = false;
4082
4083         assoc_data->wmm = bss->wmm_used &&
4084                           (local->hw.queues >= IEEE80211_NUM_ACS);
4085         if (assoc_data->wmm) {
4086                 /* try to check validity of WMM params IE */
4087                 const struct cfg80211_bss_ies *ies;
4088                 const u8 *wp, *start, *end;
4089
4090                 rcu_read_lock();
4091                 ies = rcu_dereference(req->bss->ies);
4092                 start = ies->data;
4093                 end = start + ies->len;
4094
4095                 while (true) {
4096                         wp = cfg80211_find_vendor_ie(
4097                                 WLAN_OUI_MICROSOFT,
4098                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4099                                 start, end - start);
4100                         if (!wp)
4101                                 break;
4102                         start = wp + wp[1] + 2;
4103                         /* if this IE is too short, try the next */
4104                         if (wp[1] <= 4)
4105                                 continue;
4106                         /* if this IE is WMM params, we found what we wanted */
4107                         if (wp[6] == 1)
4108                                 break;
4109                 }
4110
4111                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4112                                                         wp[1] - 2)) {
4113                         assoc_data->wmm = false;
4114                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4115                 }
4116                 rcu_read_unlock();
4117         }
4118
4119         /*
4120          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4121          * We still associate in non-HT mode (11a/b/g) if any one of these
4122          * ciphers is configured as pairwise.
4123          * We can set this to true for non-11n hardware, that'll be checked
4124          * separately along with the peer capabilities.
4125          */
4126         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4127                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4128                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4129                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4130                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4131                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4132                         netdev_info(sdata->dev,
4133                                     "disabling HT/VHT due to WEP/TKIP use\n");
4134                 }
4135         }
4136
4137         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4138                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4139                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4140         }
4141
4142         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4143                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4144
4145         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4146         sband = local->hw.wiphy->bands[req->bss->channel->band];
4147         if (!sband->ht_cap.ht_supported ||
4148             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4149             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4150                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4151                 if (!bss->wmm_used &&
4152                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4153                         netdev_info(sdata->dev,
4154                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4155         }
4156
4157         /* disable VHT if we don't support it or the AP doesn't use WMM */
4158         if (!sband->vht_cap.vht_supported ||
4159             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4160             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4161                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4162                 if (!bss->wmm_used &&
4163                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4164                         netdev_info(sdata->dev,
4165                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4166         }
4167
4168         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4169         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4170                sizeof(ifmgd->ht_capa_mask));
4171
4172         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4173         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4174                sizeof(ifmgd->vht_capa_mask));
4175
4176         if (req->ie && req->ie_len) {
4177                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4178                 assoc_data->ie_len = req->ie_len;
4179         }
4180
4181         assoc_data->bss = req->bss;
4182
4183         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4184                 if (ifmgd->powersave)
4185                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4186                 else
4187                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4188         } else
4189                 sdata->smps_mode = ifmgd->req_smps;
4190
4191         assoc_data->capability = req->bss->capability;
4192         assoc_data->supp_rates = bss->supp_rates;
4193         assoc_data->supp_rates_len = bss->supp_rates_len;
4194
4195         rcu_read_lock();
4196         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4197         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4198                 assoc_data->ap_ht_param =
4199                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4200         else
4201                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4202         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4203         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4204                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4205                        sizeof(struct ieee80211_vht_cap));
4206         else
4207                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4208         rcu_read_unlock();
4209
4210         if (bss->wmm_used && bss->uapsd_supported &&
4211             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
4212             sdata->wmm_acm != 0xff) {
4213                 assoc_data->uapsd = true;
4214                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4215         } else {
4216                 assoc_data->uapsd = false;
4217                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4218         }
4219
4220         if (req->prev_bssid)
4221                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4222
4223         if (req->use_mfp) {
4224                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4225                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4226         } else {
4227                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4228                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4229         }
4230
4231         if (req->crypto.control_port)
4232                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4233         else
4234                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4235
4236         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4237         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4238         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4239                                                         sdata->vif.type);
4240
4241         /* kick off associate process */
4242
4243         ifmgd->assoc_data = assoc_data;
4244         ifmgd->dtim_period = 0;
4245         ifmgd->have_beacon = false;
4246
4247         err = ieee80211_prep_connection(sdata, req->bss, true);
4248         if (err)
4249                 goto err_clear;
4250
4251         rcu_read_lock();
4252         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4253
4254         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4255             !beacon_ies) {
4256                 /*
4257                  * Wait up to one beacon interval ...
4258                  * should this be more if we miss one?
4259                  */
4260                 sdata_info(sdata, "waiting for beacon from %pM\n",
4261                            ifmgd->bssid);
4262                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4263                 assoc_data->timeout_started = true;
4264                 assoc_data->need_beacon = true;
4265         } else if (beacon_ies) {
4266                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4267                                                     beacon_ies->data,
4268                                                     beacon_ies->len);
4269                 u8 dtim_count = 0;
4270
4271                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4272                         const struct ieee80211_tim_ie *tim;
4273                         tim = (void *)(tim_ie + 2);
4274                         ifmgd->dtim_period = tim->dtim_period;
4275                         dtim_count = tim->dtim_count;
4276                 }
4277                 ifmgd->have_beacon = true;
4278                 assoc_data->timeout = jiffies;
4279                 assoc_data->timeout_started = true;
4280
4281                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4282                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4283                         sdata->vif.bss_conf.sync_device_ts =
4284                                 bss->device_ts_beacon;
4285                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4286                 }
4287         } else {
4288                 assoc_data->timeout = jiffies;
4289                 assoc_data->timeout_started = true;
4290         }
4291         rcu_read_unlock();
4292
4293         run_again(sdata, assoc_data->timeout);
4294
4295         if (bss->corrupt_data) {
4296                 char *corrupt_type = "data";
4297                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4298                         if (bss->corrupt_data &
4299                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4300                                 corrupt_type = "beacon and probe response";
4301                         else
4302                                 corrupt_type = "beacon";
4303                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4304                         corrupt_type = "probe response";
4305                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4306                            corrupt_type);
4307         }
4308
4309         return 0;
4310  err_clear:
4311         memset(ifmgd->bssid, 0, ETH_ALEN);
4312         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4313         ifmgd->assoc_data = NULL;
4314  err_free:
4315         kfree(assoc_data);
4316         return err;
4317 }
4318
4319 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4320                          struct cfg80211_deauth_request *req)
4321 {
4322         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4323         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4324         bool tx = !req->local_state_change;
4325         bool report_frame = false;
4326
4327         sdata_info(sdata,
4328                    "deauthenticating from %pM by local choice (reason=%d)\n",
4329                    req->bssid, req->reason_code);
4330
4331         if (ifmgd->auth_data) {
4332                 drv_mgd_prepare_tx(sdata->local, sdata);
4333                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4334                                                IEEE80211_STYPE_DEAUTH,
4335                                                req->reason_code, tx,
4336                                                frame_buf);
4337                 ieee80211_destroy_auth_data(sdata, false);
4338
4339                 report_frame = true;
4340                 goto out;
4341         }
4342
4343         if (ifmgd->associated &&
4344             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4345                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4346                                        req->reason_code, tx, frame_buf);
4347                 report_frame = true;
4348         }
4349
4350  out:
4351         if (report_frame)
4352                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4353                                       IEEE80211_DEAUTH_FRAME_LEN);
4354
4355         return 0;
4356 }
4357
4358 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4359                            struct cfg80211_disassoc_request *req)
4360 {
4361         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4362         u8 bssid[ETH_ALEN];
4363         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4364
4365         /*
4366          * cfg80211 should catch this ... but it's racy since
4367          * we can receive a disassoc frame, process it, hand it
4368          * to cfg80211 while that's in a locked section already
4369          * trying to tell us that the user wants to disconnect.
4370          */
4371         if (ifmgd->associated != req->bss)
4372                 return -ENOLINK;
4373
4374         sdata_info(sdata,
4375                    "disassociating from %pM by local choice (reason=%d)\n",
4376                    req->bss->bssid, req->reason_code);
4377
4378         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4379         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4380                                req->reason_code, !req->local_state_change,
4381                                frame_buf);
4382
4383         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4384                               IEEE80211_DEAUTH_FRAME_LEN);
4385
4386         return 0;
4387 }
4388
4389 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4390 {
4391         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4392
4393         /*
4394          * Make sure some work items will not run after this,
4395          * they will not do anything but might not have been
4396          * cancelled when disconnecting.
4397          */
4398         cancel_work_sync(&ifmgd->monitor_work);
4399         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4400         cancel_work_sync(&ifmgd->request_smps_work);
4401         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4402         cancel_work_sync(&ifmgd->chswitch_work);
4403
4404         sdata_lock(sdata);
4405         if (ifmgd->assoc_data) {
4406                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4407                 ieee80211_destroy_assoc_data(sdata, false);
4408                 cfg80211_assoc_timeout(sdata->dev, bss);
4409         }
4410         if (ifmgd->auth_data)
4411                 ieee80211_destroy_auth_data(sdata, false);
4412         del_timer_sync(&ifmgd->timer);
4413         sdata_unlock(sdata);
4414 }
4415
4416 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4417                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4418                                gfp_t gfp)
4419 {
4420         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4421
4422         trace_api_cqm_rssi_notify(sdata, rssi_event);
4423
4424         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4425 }
4426 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);