net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  34 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  35 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  36 #define IEEE80211_AUTH_MAX_TRIES        3
  37 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  38 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  39 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  40 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  41 #define IEEE80211_ASSOC_MAX_TRIES       3
  42
  43 static int max_nullfunc_tries = 2;
  44 module_param(max_nullfunc_tries, int, 0644);
  45 MODULE_PARM_DESC(max_nullfunc_tries,
  46                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  47
  48 static int max_probe_tries = 5;
  49 module_param(max_probe_tries, int, 0644);
  50 MODULE_PARM_DESC(max_probe_tries,
  51                  "Maximum probe tries before disconnecting (reason 4).");
  52
  53 /*
  54  * Beacon loss timeout is calculated as N frames times the
  55  * advertised beacon interval.  This may need to be somewhat
  56  * higher than what hardware might detect to account for
  57  * delays in the host processing frames. But since we also
  58  * probe on beacon miss before declaring the connection lost
  59  * default to what we want.
  60  */
  61 static int beacon_loss_count = 7;
  62 module_param(beacon_loss_count, int, 0644);
  63 MODULE_PARM_DESC(beacon_loss_count,
  64                  "Number of beacon intervals before we decide beacon was lost.");
  65
  66 /*
  67  * Time the connection can be idle before we probe
  68  * it to see if we can still talk to the AP.
  69  */
  70 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  71 /*
  72  * Time we wait for a probe response after sending
  73  * a probe request because of beacon loss or for
  74  * checking the connection still works.
  75  */
  76 static int probe_wait_ms = 500;
  77 module_param(probe_wait_ms, int, 0644);
  78 MODULE_PARM_DESC(probe_wait_ms,
  79                  "Maximum time(ms) to wait for probe response"
  80                  " before disconnecting (reason 4).");
  81
  82 /*
  83  * Weight given to the latest Beacon frame when calculating average signal
  84  * strength for Beacon frames received in the current BSS. This must be
  85  * between 1 and 15.
  86  */
  87 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  88
  89 /*
  90  * How many Beacon frames need to have been used in average signal strength
  91  * before starting to indicate signal change events.
  92  */
  93 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  94
  95 /*
  96  * We can have multiple work items (and connection probing)
  97  * scheduling this timer, but we need to take care to only
  98  * reschedule it when it should fire _earlier_ than it was
  99  * asked for before, or if it's not pending right now. This
 100  * function ensures that. Note that it then is required to
 101  * run this function for all timeouts after the first one
 102  * has happened -- the work that runs from this timer will
 103  * do that.
 104  */
 105 static void run_again(struct ieee80211_sub_if_data *sdata,
 106                       unsigned long timeout)
 107 {
 108         sdata_assert_lock(sdata);
 109
 110         if (!timer_pending(&sdata->u.mgd.timer) ||
 111             time_before(timeout, sdata->u.mgd.timer.expires))
 112                 mod_timer(&sdata->u.mgd.timer, timeout);
 113 }
 114
 115 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 116 {
 117         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 118                 return;
 119
 120         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 121                 return;
 122
 123         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 124                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 125 }
 126
 127 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 128 {
 129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 130
 131         if (unlikely(!sdata->u.mgd.associated))
 132                 return;
 133
 134         ifmgd->probe_send_count = 0;
 135
 136         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 137                 return;
 138
 139         mod_timer(&sdata->u.mgd.conn_mon_timer,
 140                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 141 }
 142
 143 static int ecw2cw(int ecw)
 144 {
 145         return (1 << ecw) - 1;
 146 }
 147
 148 static u32
 149 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 150                              struct ieee80211_supported_band *sband,
 151                              struct ieee80211_channel *channel,
 152                              const struct ieee80211_ht_cap *ht_cap,
 153                              const struct ieee80211_ht_operation *ht_oper,
 154                              const struct ieee80211_vht_operation *vht_oper,
 155                              struct cfg80211_chan_def *chandef, bool tracking)
 156 {
 157         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 158         struct cfg80211_chan_def vht_chandef;
 159         u32 ht_cfreq, ret;
 160
 161         chandef->chan = channel;
 162         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 163         chandef->center_freq1 = channel->center_freq;
 164         chandef->center_freq2 = 0;
 165
 166         if (!ht_cap || !ht_oper || !sband->ht_cap.ht_supported) {
 167                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 168                 goto out;
 169         }
 170
 171         chandef->width = NL80211_CHAN_WIDTH_20;
 172
 173         if (!(ht_cap->cap_info &
 174               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 175                 ret = IEEE80211_STA_DISABLE_40MHZ | IEEE80211_STA_DISABLE_VHT;
 176                 goto out;
 177         }
 178
 179         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 180                                                   channel->band);
 181         /* check that channel matches the right operating channel */
 182         if (!tracking && channel->center_freq != ht_cfreq) {
 183                 /*
 184                  * It's possible that some APs are confused here;
 185                  * Netgear WNDR3700 sometimes reports 4 higher than
 186                  * the actual channel in association responses, but
 187                  * since we look at probe response/beacon data here
 188                  * it should be OK.
 189                  */
 190                 sdata_info(sdata,
 191                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 192                            channel->center_freq, ht_cfreq,
 193                            ht_oper->primary_chan, channel->band);
 194                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 195                 goto out;
 196         }
 197
 198         /* check 40 MHz support, if we have it */
 199         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 200                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 201                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 202                         chandef->width = NL80211_CHAN_WIDTH_40;
 203                         chandef->center_freq1 += 10;
 204                         break;
 205                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 206                         chandef->width = NL80211_CHAN_WIDTH_40;
 207                         chandef->center_freq1 -= 10;
 208                         break;
 209                 }
 210         } else {
 211                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 212                 ret = IEEE80211_STA_DISABLE_VHT;
 213                 /* also mark 40 MHz disabled */
 214                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 215                 goto out;
 216         }
 217
 218         if (!vht_oper || !sband->vht_cap.vht_supported) {
 219                 ret = IEEE80211_STA_DISABLE_VHT;
 220                 goto out;
 221         }
 222
 223         vht_chandef.chan = channel;
 224         vht_chandef.center_freq1 =
 225                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 226                                                channel->band);
 227         vht_chandef.center_freq2 = 0;
 228
 229         switch (vht_oper->chan_width) {
 230         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 231                 vht_chandef.width = chandef->width;
 232                 vht_chandef.center_freq1 = chandef->center_freq1;
 233                 break;
 234         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 235                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 236                 break;
 237         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 238                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 239                 break;
 240         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 241                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 242                 vht_chandef.center_freq2 =
 243                         ieee80211_channel_to_frequency(
 244                                 vht_oper->center_freq_seg2_idx,
 245                                 channel->band);
 246                 break;
 247         default:
 248                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 249                         sdata_info(sdata,
 250                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 251                                    vht_oper->chan_width);
 252                 ret = IEEE80211_STA_DISABLE_VHT;
 253                 goto out;
 254         }
 255
 256         if (!cfg80211_chandef_valid(&vht_chandef)) {
 257                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 258                         sdata_info(sdata,
 259                                    "AP VHT information is invalid, disable VHT\n");
 260                 ret = IEEE80211_STA_DISABLE_VHT;
 261                 goto out;
 262         }
 263
 264         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 265                 ret = 0;
 266                 goto out;
 267         }
 268
 269         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 270                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 271                         sdata_info(sdata,
 272                                    "AP VHT information doesn't match HT, disable VHT\n");
 273                 ret = IEEE80211_STA_DISABLE_VHT;
 274                 goto out;
 275         }
 276
 277         *chandef = vht_chandef;
 278
 279         ret = 0;
 280
 281 out:
 282         /*
 283          * When tracking the current AP, don't do any further checks if the
 284          * new chandef is identical to the one we're currently using for the
 285          * connection. This keeps us from playing ping-pong with regulatory,
 286          * without it the following can happen (for example):
 287          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 288          *  - AP advertises regdom US
 289          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 290          *  - the code below detects an unsupported channel, downgrades, and
 291          *    we disconnect from the AP in the caller
 292          *  - disconnect causes CRDA to reload world regdomain and the game
 293          *    starts anew.
 294          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 295          *
 296          * It seems possible that there are still scenarios with CSA or real
 297          * bandwidth changes where a this could happen, but those cases are
 298          * less common and wouldn't completely prevent using the AP.
 299          */
 300         if (tracking &&
 301             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 302                 return ret;
 303
 304         /* don't print the message below for VHT mismatch if VHT is disabled */
 305         if (ret & IEEE80211_STA_DISABLE_VHT)
 306                 vht_chandef = *chandef;
 307
 308         /*
 309          * Ignore the DISABLED flag when we're already connected and only
 310          * tracking the APs beacon for bandwidth changes - otherwise we
 311          * might get disconnected here if we connect to an AP, update our
 312          * regulatory information based on the AP's country IE and the
 313          * information we have is wrong/outdated and disables the channel
 314          * that we're actually using for the connection to the AP.
 315          */
 316         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 317                                         tracking ? 0 :
 318                                                    IEEE80211_CHAN_DISABLED)) {
 319                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 320                         ret = IEEE80211_STA_DISABLE_HT |
 321                               IEEE80211_STA_DISABLE_VHT;
 322                         break;
 323                 }
 324
 325                 ret |= ieee80211_chandef_downgrade(chandef);
 326         }
 327
 328         if (chandef->width != vht_chandef.width && !tracking)
 329                 sdata_info(sdata,
 330                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 331
 332         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 333         return ret;
 334 }
 335
 336 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 337                                struct sta_info *sta,
 338                                const struct ieee80211_ht_cap *ht_cap,
 339                                const struct ieee80211_ht_operation *ht_oper,
 340                                const struct ieee80211_vht_operation *vht_oper,
 341                                const u8 *bssid, u32 *changed)
 342 {
 343         struct ieee80211_local *local = sdata->local;
 344         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 345         struct ieee80211_supported_band *sband;
 346         struct ieee80211_channel *chan;
 347         struct cfg80211_chan_def chandef;
 348         u16 ht_opmode;
 349         u32 flags;
 350         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 351         int ret;
 352
 353         /* if HT was/is disabled, don't track any bandwidth changes */
 354         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 355                 return 0;
 356
 357         /* don't check VHT if we associated as non-VHT station */
 358         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 359                 vht_oper = NULL;
 360
 361         if (WARN_ON_ONCE(!sta))
 362                 return -EINVAL;
 363
 364         /*
 365          * if bss configuration changed store the new one -
 366          * this may be applicable even if channel is identical
 367          */
 368         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 369         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 370                 *changed |= BSS_CHANGED_HT;
 371                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 372         }
 373
 374         chan = sdata->vif.bss_conf.chandef.chan;
 375         sband = local->hw.wiphy->bands[chan->band];
 376
 377         /* calculate new channel (type) based on HT/VHT operation IEs */
 378         flags = ieee80211_determine_chantype(sdata, sband, chan,
 379                                              ht_cap, ht_oper, vht_oper,
 380                                              &chandef, true);
 381
 382         /*
 383          * Downgrade the new channel if we associated with restricted
 384          * capabilities. For example, if we associated as a 20 MHz STA
 385          * to a 40 MHz AP (due to regulatory, capabilities or config
 386          * reasons) then switching to a 40 MHz channel now won't do us
 387          * any good -- we couldn't use it with the AP.
 388          */
 389         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 390             chandef.width == NL80211_CHAN_WIDTH_80P80)
 391                 flags |= ieee80211_chandef_downgrade(&chandef);
 392         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 393             chandef.width == NL80211_CHAN_WIDTH_160)
 394                 flags |= ieee80211_chandef_downgrade(&chandef);
 395         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 396             chandef.width > NL80211_CHAN_WIDTH_20)
 397                 flags |= ieee80211_chandef_downgrade(&chandef);
 398
 399         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 400                 return 0;
 401
 402         sdata_info(sdata,
 403                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 404                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 405                    chandef.center_freq1, chandef.center_freq2);
 406
 407         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 408                                       IEEE80211_STA_DISABLE_VHT |
 409                                       IEEE80211_STA_DISABLE_40MHZ |
 410                                       IEEE80211_STA_DISABLE_80P80MHZ |
 411                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 412             !cfg80211_chandef_valid(&chandef)) {
 413                 sdata_info(sdata,
 414                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 415                            ifmgd->bssid);
 416                 return -EINVAL;
 417         }
 418
 419         switch (chandef.width) {
 420         case NL80211_CHAN_WIDTH_20_NOHT:
 421         case NL80211_CHAN_WIDTH_20:
 422                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 423                 break;
 424         case NL80211_CHAN_WIDTH_40:
 425                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 426                 break;
 427         case NL80211_CHAN_WIDTH_80:
 428                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 429                 break;
 430         case NL80211_CHAN_WIDTH_80P80:
 431         case NL80211_CHAN_WIDTH_160:
 432                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 433                 break;
 434         default:
 435                 return -EINVAL;
 436         }
 437
 438         if (new_sta_bw > sta->cur_max_bandwidth)
 439                 new_sta_bw = sta->cur_max_bandwidth;
 440
 441         if (new_sta_bw < sta->sta.bandwidth) {
 442                 sta->sta.bandwidth = new_sta_bw;
 443                 rate_control_rate_update(local, sband, sta,
 444                                          IEEE80211_RC_BW_CHANGED);
 445         }
 446
 447         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 448         if (ret) {
 449                 sdata_info(sdata,
 450                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 451                            ifmgd->bssid);
 452                 return ret;
 453         }
 454
 455         if (new_sta_bw > sta->sta.bandwidth) {
 456                 sta->sta.bandwidth = new_sta_bw;
 457                 rate_control_rate_update(local, sband, sta,
 458                                          IEEE80211_RC_BW_CHANGED);
 459         }
 460
 461         return 0;
 462 }
 463
 464 /* frame sending functions */
 465
 466 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 467                                 struct sk_buff *skb, u8 ap_ht_param,
 468                                 struct ieee80211_supported_band *sband,
 469                                 struct ieee80211_channel *channel,
 470                                 enum ieee80211_smps_mode smps)
 471 {
 472         u8 *pos;
 473         u32 flags = channel->flags;
 474         u16 cap;
 475         struct ieee80211_sta_ht_cap ht_cap;
 476
 477         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 478
 479         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 480         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 481
 482         /* determine capability flags */
 483         cap = ht_cap.cap;
 484
 485         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 486         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 487                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 488                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 489                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 490                 }
 491                 break;
 492         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 493                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 494                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 495                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 496                 }
 497                 break;
 498         }
 499
 500         /*
 501          * If 40 MHz was disabled associate as though we weren't
 502          * capable of 40 MHz -- some broken APs will never fall
 503          * back to trying to transmit in 20 MHz.
 504          */
 505         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 506                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 507                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 508         }
 509
 510         /* set SM PS mode properly */
 511         cap &= ~IEEE80211_HT_CAP_SM_PS;
 512         switch (smps) {
 513         case IEEE80211_SMPS_AUTOMATIC:
 514         case IEEE80211_SMPS_NUM_MODES:
 515                 WARN_ON(1);
 516         case IEEE80211_SMPS_OFF:
 517                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 518                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 519                 break;
 520         case IEEE80211_SMPS_STATIC:
 521                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 522                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 523                 break;
 524         case IEEE80211_SMPS_DYNAMIC:
 525                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 526                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 527                 break;
 528         }
 529
 530         /* reserve and fill IE */
 531         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 532         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 533 }
 534
 535 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 536                                  struct sk_buff *skb,
 537                                  struct ieee80211_supported_band *sband,
 538                                  struct ieee80211_vht_cap *ap_vht_cap)
 539 {
 540         u8 *pos;
 541         u32 cap;
 542         struct ieee80211_sta_vht_cap vht_cap;
 543         u32 mask, ap_bf_sts, our_bf_sts;
 544
 545         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 546
 547         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 548         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 549
 550         /* determine capability flags */
 551         cap = vht_cap.cap;
 552
 553         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 554                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 555                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 556         }
 557
 558         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 559                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 560                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 561         }
 562
 563         /*
 564          * Some APs apparently get confused if our capabilities are better
 565          * than theirs, so restrict what we advertise in the assoc request.
 566          */
 567         if (!(ap_vht_cap->vht_cap_info &
 568                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 569                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 570
 571         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 572
 573         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 574         our_bf_sts = cap & mask;
 575
 576         if (ap_bf_sts < our_bf_sts) {
 577                 cap &= ~mask;
 578                 cap |= ap_bf_sts;
 579         }
 580
 581         /* reserve and fill IE */
 582         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 583         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 584 }
 585
 586 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 587 {
 588         struct ieee80211_local *local = sdata->local;
 589         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 590         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 591         struct sk_buff *skb;
 592         struct ieee80211_mgmt *mgmt;
 593         u8 *pos, qos_info;
 594         size_t offset = 0, noffset;
 595         int i, count, rates_len, supp_rates_len, shift;
 596         u16 capab;
 597         struct ieee80211_supported_band *sband;
 598         struct ieee80211_chanctx_conf *chanctx_conf;
 599         struct ieee80211_channel *chan;
 600         u32 rate_flags, rates = 0;
 601
 602         sdata_assert_lock(sdata);
 603
 604         rcu_read_lock();
 605         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 606         if (WARN_ON(!chanctx_conf)) {
 607                 rcu_read_unlock();
 608                 return;
 609         }
 610         chan = chanctx_conf->def.chan;
 611         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 612         rcu_read_unlock();
 613         sband = local->hw.wiphy->bands[chan->band];
 614         shift = ieee80211_vif_get_shift(&sdata->vif);
 615
 616         if (assoc_data->supp_rates_len) {
 617                 /*
 618                  * Get all rates supported by the device and the AP as
 619                  * some APs don't like getting a superset of their rates
 620                  * in the association request (e.g. D-Link DAP 1353 in
 621                  * b-only mode)...
 622                  */
 623                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 624                                                      assoc_data->supp_rates,
 625                                                      assoc_data->supp_rates_len,
 626                                                      &rates);
 627         } else {
 628                 /*
 629                  * In case AP not provide any supported rates information
 630                  * before association, we send information element(s) with
 631                  * all rates that we support.
 632                  */
 633                 rates_len = 0;
 634                 for (i = 0; i < sband->n_bitrates; i++) {
 635                         if ((rate_flags & sband->bitrates[i].flags)
 636                             != rate_flags)
 637                                 continue;
 638                         rates |= BIT(i);
 639                         rates_len++;
 640                 }
 641         }
 642
 643         skb = alloc_skb(local->hw.extra_tx_headroom +
 644                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 645                         2 + assoc_data->ssid_len + /* SSID */
 646                         4 + rates_len + /* (extended) rates */
 647                         4 + /* power capability */
 648                         2 + 2 * sband->n_channels + /* supported channels */
 649                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 650                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 651                         assoc_data->ie_len + /* extra IEs */
 652                         9, /* WMM */
 653                         GFP_KERNEL);
 654         if (!skb)
 655                 return;
 656
 657         skb_reserve(skb, local->hw.extra_tx_headroom);
 658
 659         capab = WLAN_CAPABILITY_ESS;
 660
 661         if (sband->band == IEEE80211_BAND_2GHZ) {
 662                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 663                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 664                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 665                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 666         }
 667
 668         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 669                 capab |= WLAN_CAPABILITY_PRIVACY;
 670
 671         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 672             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 673                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 674
 675         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 676         memset(mgmt, 0, 24);
 677         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 678         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 679         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 680
 681         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 682                 skb_put(skb, 10);
 683                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 684                                                   IEEE80211_STYPE_REASSOC_REQ);
 685                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 686                 mgmt->u.reassoc_req.listen_interval =
 687                                 cpu_to_le16(local->hw.conf.listen_interval);
 688                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 689                        ETH_ALEN);
 690         } else {
 691                 skb_put(skb, 4);
 692                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 693                                                   IEEE80211_STYPE_ASSOC_REQ);
 694                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 695                 mgmt->u.assoc_req.listen_interval =
 696                                 cpu_to_le16(local->hw.conf.listen_interval);
 697         }
 698
 699         /* SSID */
 700         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 701         *pos++ = WLAN_EID_SSID;
 702         *pos++ = assoc_data->ssid_len;
 703         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 704
 705         /* add all rates which were marked to be used above */
 706         supp_rates_len = rates_len;
 707         if (supp_rates_len > 8)
 708                 supp_rates_len = 8;
 709
 710         pos = skb_put(skb, supp_rates_len + 2);
 711         *pos++ = WLAN_EID_SUPP_RATES;
 712         *pos++ = supp_rates_len;
 713
 714         count = 0;
 715         for (i = 0; i < sband->n_bitrates; i++) {
 716                 if (BIT(i) & rates) {
 717                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 718                                                 5 * (1 << shift));
 719                         *pos++ = (u8) rate;
 720                         if (++count == 8)
 721                                 break;
 722                 }
 723         }
 724
 725         if (rates_len > count) {
 726                 pos = skb_put(skb, rates_len - count + 2);
 727                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 728                 *pos++ = rates_len - count;
 729
 730                 for (i++; i < sband->n_bitrates; i++) {
 731                         if (BIT(i) & rates) {
 732                                 int rate;
 733                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 734                                                     5 * (1 << shift));
 735                                 *pos++ = (u8) rate;
 736                         }
 737                 }
 738         }
 739
 740         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 741                 /* 1. power capabilities */
 742                 pos = skb_put(skb, 4);
 743                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 744                 *pos++ = 2;
 745                 *pos++ = 0; /* min tx power */
 746                  /* max tx power */
 747                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 748
 749                 /* 2. supported channels */
 750                 /* TODO: get this in reg domain format */
 751                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 752                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 753                 *pos++ = 2 * sband->n_channels;
 754                 for (i = 0; i < sband->n_channels; i++) {
 755                         *pos++ = ieee80211_frequency_to_channel(
 756                                         sband->channels[i].center_freq);
 757                         *pos++ = 1; /* one channel in the subband*/
 758                 }
 759         }
 760
 761         /* if present, add any custom IEs that go before HT */
 762         if (assoc_data->ie_len) {
 763                 static const u8 before_ht[] = {
 764                         WLAN_EID_SSID,
 765                         WLAN_EID_SUPP_RATES,
 766                         WLAN_EID_EXT_SUPP_RATES,
 767                         WLAN_EID_PWR_CAPABILITY,
 768                         WLAN_EID_SUPPORTED_CHANNELS,
 769                         WLAN_EID_RSN,
 770                         WLAN_EID_QOS_CAPA,
 771                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 772                         WLAN_EID_MOBILITY_DOMAIN,
 773                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 774                 };
 775                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 776                                              before_ht, ARRAY_SIZE(before_ht),
 777                                              offset);
 778                 pos = skb_put(skb, noffset - offset);
 779                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 780                 offset = noffset;
 781         }
 782
 783         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 784                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 785                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 786
 787         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 788                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 789                                     sband, chan, sdata->smps_mode);
 790
 791         /* if present, add any custom IEs that go before VHT */
 792         if (assoc_data->ie_len) {
 793                 static const u8 before_vht[] = {
 794                         WLAN_EID_SSID,
 795                         WLAN_EID_SUPP_RATES,
 796                         WLAN_EID_EXT_SUPP_RATES,
 797                         WLAN_EID_PWR_CAPABILITY,
 798                         WLAN_EID_SUPPORTED_CHANNELS,
 799                         WLAN_EID_RSN,
 800                         WLAN_EID_QOS_CAPA,
 801                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 802                         WLAN_EID_MOBILITY_DOMAIN,
 803                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 804                         WLAN_EID_HT_CAPABILITY,
 805                         WLAN_EID_BSS_COEX_2040,
 806                         WLAN_EID_EXT_CAPABILITY,
 807                         WLAN_EID_QOS_TRAFFIC_CAPA,
 808                         WLAN_EID_TIM_BCAST_REQ,
 809                         WLAN_EID_INTERWORKING,
 810                 };
 811                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 812                                              before_vht, ARRAY_SIZE(before_vht),
 813                                              offset);
 814                 pos = skb_put(skb, noffset - offset);
 815                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 816                 offset = noffset;
 817         }
 818
 819         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 820                 ieee80211_add_vht_ie(sdata, skb, sband,
 821                                      &assoc_data->ap_vht_cap);
 822
 823         /* if present, add any custom non-vendor IEs that go after HT */
 824         if (assoc_data->ie_len) {
 825                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 826                                                     assoc_data->ie_len,
 827                                                     offset);
 828                 pos = skb_put(skb, noffset - offset);
 829                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 830                 offset = noffset;
 831         }
 832
 833         if (assoc_data->wmm) {
 834                 if (assoc_data->uapsd) {
 835                         qos_info = ifmgd->uapsd_queues;
 836                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 837                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 838                 } else {
 839                         qos_info = 0;
 840                 }
 841
 842                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 843         }
 844
 845         /* add any remaining custom (i.e. vendor specific here) IEs */
 846         if (assoc_data->ie_len) {
 847                 noffset = assoc_data->ie_len;
 848                 pos = skb_put(skb, noffset - offset);
 849                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 850         }
 851
 852         drv_mgd_prepare_tx(local, sdata);
 853
 854         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 855         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 856                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 857                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 858         ieee80211_tx_skb(sdata, skb);
 859 }
 860
 861 void ieee80211_send_pspoll(struct ieee80211_local *local,
 862                            struct ieee80211_sub_if_data *sdata)
 863 {
 864         struct ieee80211_pspoll *pspoll;
 865         struct sk_buff *skb;
 866
 867         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 868         if (!skb)
 869                 return;
 870
 871         pspoll = (struct ieee80211_pspoll *) skb->data;
 872         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 873
 874         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 875         ieee80211_tx_skb(sdata, skb);
 876 }
 877
 878 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 879                              struct ieee80211_sub_if_data *sdata,
 880                              int powersave)
 881 {
 882         struct sk_buff *skb;
 883         struct ieee80211_hdr_3addr *nullfunc;
 884         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 885
 886         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 887         if (!skb)
 888                 return;
 889
 890         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 891         if (powersave)
 892                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 893
 894         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 895                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 896
 897         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 898                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 899
 900         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 901                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 902
 903         ieee80211_tx_skb(sdata, skb);
 904 }
 905
 906 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 907                                           struct ieee80211_sub_if_data *sdata)
 908 {
 909         struct sk_buff *skb;
 910         struct ieee80211_hdr *nullfunc;
 911         __le16 fc;
 912
 913         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 914                 return;
 915
 916         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 917         if (!skb)
 918                 return;
 919
 920         skb_reserve(skb, local->hw.extra_tx_headroom);
 921
 922         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 923         memset(nullfunc, 0, 30);
 924         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 925                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 926         nullfunc->frame_control = fc;
 927         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 928         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 929         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 930         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 931
 932         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 933         ieee80211_tx_skb(sdata, skb);
 934 }
 935
 936 /* spectrum management related things */
 937 static void ieee80211_chswitch_work(struct work_struct *work)
 938 {
 939         struct ieee80211_sub_if_data *sdata =
 940                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 941         struct ieee80211_local *local = sdata->local;
 942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 943         int ret;
 944
 945         if (!ieee80211_sdata_running(sdata))
 946                 return;
 947
 948         sdata_lock(sdata);
 949         mutex_lock(&local->mtx);
 950         mutex_lock(&local->chanctx_mtx);
 951
 952         if (!ifmgd->associated)
 953                 goto out;
 954
 955         if (!sdata->vif.csa_active)
 956                 goto out;
 957
 958         /*
 959          * using reservation isn't immediate as it may be deferred until later
 960          * with multi-vif. once reservation is complete it will re-schedule the
 961          * work with no reserved_chanctx so verify chandef to check if it
 962          * completed successfully
 963          */
 964
 965         if (sdata->reserved_chanctx) {
 966                 /*
 967                  * with multi-vif csa driver may call ieee80211_csa_finish()
 968                  * many times while waiting for other interfaces to use their
 969                  * reservations
 970                  */
 971                 if (sdata->reserved_ready)
 972                         goto out;
 973
 974                 ret = ieee80211_vif_use_reserved_context(sdata);
 975                 if (ret) {
 976                         sdata_info(sdata,
 977                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
 978                                    ret);
 979                         ieee80211_queue_work(&sdata->local->hw,
 980                                              &ifmgd->csa_connection_drop_work);
 981                         goto out;
 982                 }
 983
 984                 goto out;
 985         }
 986
 987         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
 988                                         &sdata->csa_chandef)) {
 989                 sdata_info(sdata,
 990                            "failed to finalize channel switch, disconnecting\n");
 991                 ieee80211_queue_work(&sdata->local->hw,
 992                                      &ifmgd->csa_connection_drop_work);
 993                 goto out;
 994         }
 995
 996         /* XXX: shouldn't really modify cfg80211-owned data! */
 997         ifmgd->associated->channel = sdata->csa_chandef.chan;
 998
 999         sdata->vif.csa_active = false;
1000
1001         /* XXX: wait for a beacon first? */
1002         if (sdata->csa_block_tx) {
1003                 ieee80211_wake_vif_queues(local, sdata,
1004                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1005                 sdata->csa_block_tx = false;
1006         }
1007
1008         ieee80211_sta_reset_beacon_monitor(sdata);
1009         ieee80211_sta_reset_conn_monitor(sdata);
1010
1011 out:
1012         mutex_unlock(&local->chanctx_mtx);
1013         mutex_unlock(&local->mtx);
1014         sdata_unlock(sdata);
1015 }
1016
1017 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1018 {
1019         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1020         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1021
1022         trace_api_chswitch_done(sdata, success);
1023         if (!success) {
1024                 sdata_info(sdata,
1025                            "driver channel switch failed, disconnecting\n");
1026                 ieee80211_queue_work(&sdata->local->hw,
1027                                      &ifmgd->csa_connection_drop_work);
1028         } else {
1029                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1030         }
1031 }
1032 EXPORT_SYMBOL(ieee80211_chswitch_done);
1033
1034 static void ieee80211_chswitch_timer(unsigned long data)
1035 {
1036         struct ieee80211_sub_if_data *sdata =
1037                 (struct ieee80211_sub_if_data *) data;
1038
1039         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1040 }
1041
1042 static void
1043 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1044                                  u64 timestamp, struct ieee802_11_elems *elems,
1045                                  bool beacon)
1046 {
1047         struct ieee80211_local *local = sdata->local;
1048         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1049         struct cfg80211_bss *cbss = ifmgd->associated;
1050         struct ieee80211_chanctx_conf *conf;
1051         struct ieee80211_chanctx *chanctx;
1052         enum ieee80211_band current_band;
1053         struct ieee80211_csa_ie csa_ie;
1054         int res;
1055
1056         sdata_assert_lock(sdata);
1057
1058         if (!cbss)
1059                 return;
1060
1061         if (local->scanning)
1062                 return;
1063
1064         /* disregard subsequent announcements if we are already processing */
1065         if (sdata->vif.csa_active)
1066                 return;
1067
1068         current_band = cbss->channel->band;
1069         memset(&csa_ie, 0, sizeof(csa_ie));
1070         res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
1071                                            ifmgd->flags,
1072                                            ifmgd->associated->bssid, &csa_ie);
1073         if (res < 0)
1074                 ieee80211_queue_work(&local->hw,
1075                                      &ifmgd->csa_connection_drop_work);
1076         if (res)
1077                 return;
1078
1079         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1080                                      IEEE80211_CHAN_DISABLED)) {
1081                 sdata_info(sdata,
1082                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1083                            ifmgd->associated->bssid,
1084                            csa_ie.chandef.chan->center_freq,
1085                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1086                            csa_ie.chandef.center_freq2);
1087                 ieee80211_queue_work(&local->hw,
1088                                      &ifmgd->csa_connection_drop_work);
1089                 return;
1090         }
1091
1092         mutex_lock(&local->mtx);
1093         mutex_lock(&local->chanctx_mtx);
1094         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1095                                          lockdep_is_held(&local->chanctx_mtx));
1096         if (!conf) {
1097                 sdata_info(sdata,
1098                            "no channel context assigned to vif?, disconnecting\n");
1099                 ieee80211_queue_work(&local->hw,
1100                                      &ifmgd->csa_connection_drop_work);
1101                 mutex_unlock(&local->chanctx_mtx);
1102                 mutex_unlock(&local->mtx);
1103                 return;
1104         }
1105
1106         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1107
1108         if (local->use_chanctx) {
1109                 u32 num_chanctx = 0;
1110                 list_for_each_entry(chanctx, &local->chanctx_list, list)
1111                        num_chanctx++;
1112
1113                 if (num_chanctx > 1 ||
1114                     !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1115                         sdata_info(sdata,
1116                                    "not handling chan-switch with channel contexts\n");
1117                         ieee80211_queue_work(&local->hw,
1118                                              &ifmgd->csa_connection_drop_work);
1119                         mutex_unlock(&local->chanctx_mtx);
1120                         mutex_unlock(&local->mtx);
1121                         return;
1122                 }
1123         }
1124
1125         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1126                                             chanctx->mode, false);
1127         if (res) {
1128                 sdata_info(sdata,
1129                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1130                            res);
1131                 ieee80211_queue_work(&local->hw,
1132                                      &ifmgd->csa_connection_drop_work);
1133                 mutex_unlock(&local->chanctx_mtx);
1134                 mutex_unlock(&local->mtx);
1135                 return;
1136         }
1137         mutex_unlock(&local->chanctx_mtx);
1138
1139         sdata->vif.csa_active = true;
1140         sdata->csa_chandef = csa_ie.chandef;
1141         sdata->csa_block_tx = csa_ie.mode;
1142
1143         if (sdata->csa_block_tx)
1144                 ieee80211_stop_vif_queues(local, sdata,
1145                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1146         mutex_unlock(&local->mtx);
1147
1148         if (local->ops->channel_switch) {
1149                 /* use driver's channel switch callback */
1150                 struct ieee80211_channel_switch ch_switch = {
1151                         .timestamp = timestamp,
1152                         .block_tx = csa_ie.mode,
1153                         .chandef = csa_ie.chandef,
1154                         .count = csa_ie.count,
1155                 };
1156
1157                 drv_channel_switch(local, &ch_switch);
1158                 return;
1159         }
1160
1161         /* channel switch handled in software */
1162         if (csa_ie.count <= 1)
1163                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1164         else
1165                 mod_timer(&ifmgd->chswitch_timer,
1166                           TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1167 }
1168
1169 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1170                                        struct ieee80211_channel *channel,
1171                                        const u8 *country_ie, u8 country_ie_len,
1172                                        const u8 *pwr_constr_elem)
1173 {
1174         struct ieee80211_country_ie_triplet *triplet;
1175         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1176         int i, chan_pwr, chan_increment, new_ap_level;
1177         bool have_chan_pwr = false;
1178
1179         /* Invalid IE */
1180         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1181                 return 0;
1182
1183         triplet = (void *)(country_ie + 3);
1184         country_ie_len -= 3;
1185
1186         switch (channel->band) {
1187         default:
1188                 WARN_ON_ONCE(1);
1189                 /* fall through */
1190         case IEEE80211_BAND_2GHZ:
1191         case IEEE80211_BAND_60GHZ:
1192                 chan_increment = 1;
1193                 break;
1194         case IEEE80211_BAND_5GHZ:
1195                 chan_increment = 4;
1196                 break;
1197         }
1198
1199         /* find channel */
1200         while (country_ie_len >= 3) {
1201                 u8 first_channel = triplet->chans.first_channel;
1202
1203                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1204                         goto next;
1205
1206                 for (i = 0; i < triplet->chans.num_channels; i++) {
1207                         if (first_channel + i * chan_increment == chan) {
1208                                 have_chan_pwr = true;
1209                                 chan_pwr = triplet->chans.max_power;
1210                                 break;
1211                         }
1212                 }
1213                 if (have_chan_pwr)
1214                         break;
1215
1216  next:
1217                 triplet++;
1218                 country_ie_len -= 3;
1219         }
1220
1221         if (!have_chan_pwr)
1222                 return 0;
1223
1224         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
1225
1226         if (sdata->ap_power_level == new_ap_level)
1227                 return 0;
1228
1229         sdata_info(sdata,
1230                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1231                    new_ap_level, chan_pwr, *pwr_constr_elem,
1232                    sdata->u.mgd.bssid);
1233         sdata->ap_power_level = new_ap_level;
1234         if (__ieee80211_recalc_txpower(sdata))
1235                 return BSS_CHANGED_TXPOWER;
1236         return 0;
1237 }
1238
1239 /* powersave */
1240 static void ieee80211_enable_ps(struct ieee80211_local *local,
1241                                 struct ieee80211_sub_if_data *sdata)
1242 {
1243         struct ieee80211_conf *conf = &local->hw.conf;
1244
1245         /*
1246          * If we are scanning right now then the parameters will
1247          * take effect when scan finishes.
1248          */
1249         if (local->scanning)
1250                 return;
1251
1252         if (conf->dynamic_ps_timeout > 0 &&
1253             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1254                 mod_timer(&local->dynamic_ps_timer, jiffies +
1255                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1256         } else {
1257                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1258                         ieee80211_send_nullfunc(local, sdata, 1);
1259
1260                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1261                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1262                         return;
1263
1264                 conf->flags |= IEEE80211_CONF_PS;
1265                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1266         }
1267 }
1268
1269 static void ieee80211_change_ps(struct ieee80211_local *local)
1270 {
1271         struct ieee80211_conf *conf = &local->hw.conf;
1272
1273         if (local->ps_sdata) {
1274                 ieee80211_enable_ps(local, local->ps_sdata);
1275         } else if (conf->flags & IEEE80211_CONF_PS) {
1276                 conf->flags &= ~IEEE80211_CONF_PS;
1277                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1278                 del_timer_sync(&local->dynamic_ps_timer);
1279                 cancel_work_sync(&local->dynamic_ps_enable_work);
1280         }
1281 }
1282
1283 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1284 {
1285         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1286         struct sta_info *sta = NULL;
1287         bool authorized = false;
1288
1289         if (!mgd->powersave)
1290                 return false;
1291
1292         if (mgd->broken_ap)
1293                 return false;
1294
1295         if (!mgd->associated)
1296                 return false;
1297
1298         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1299                 return false;
1300
1301         if (!mgd->have_beacon)
1302                 return false;
1303
1304         rcu_read_lock();
1305         sta = sta_info_get(sdata, mgd->bssid);
1306         if (sta)
1307                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1308         rcu_read_unlock();
1309
1310         return authorized;
1311 }
1312
1313 /* need to hold RTNL or interface lock */
1314 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1315 {
1316         struct ieee80211_sub_if_data *sdata, *found = NULL;
1317         int count = 0;
1318         int timeout;
1319
1320         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1321                 local->ps_sdata = NULL;
1322                 return;
1323         }
1324
1325         list_for_each_entry(sdata, &local->interfaces, list) {
1326                 if (!ieee80211_sdata_running(sdata))
1327                         continue;
1328                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1329                         /* If an AP vif is found, then disable PS
1330                          * by setting the count to zero thereby setting
1331                          * ps_sdata to NULL.
1332                          */
1333                         count = 0;
1334                         break;
1335                 }
1336                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1337                         continue;
1338                 found = sdata;
1339                 count++;
1340         }
1341
1342         if (count == 1 && ieee80211_powersave_allowed(found)) {
1343                 s32 beaconint_us;
1344
1345                 if (latency < 0)
1346                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1347
1348                 beaconint_us = ieee80211_tu_to_usec(
1349                                         found->vif.bss_conf.beacon_int);
1350
1351                 timeout = local->dynamic_ps_forced_timeout;
1352                 if (timeout < 0) {
1353                         /*
1354                          * Go to full PSM if the user configures a very low
1355                          * latency requirement.
1356                          * The 2000 second value is there for compatibility
1357                          * until the PM_QOS_NETWORK_LATENCY is configured
1358                          * with real values.
1359                          */
1360                         if (latency > (1900 * USEC_PER_MSEC) &&
1361                             latency != (2000 * USEC_PER_SEC))
1362                                 timeout = 0;
1363                         else
1364                                 timeout = 100;
1365                 }
1366                 local->hw.conf.dynamic_ps_timeout = timeout;
1367
1368                 if (beaconint_us > latency) {
1369                         local->ps_sdata = NULL;
1370                 } else {
1371                         int maxslp = 1;
1372                         u8 dtimper = found->u.mgd.dtim_period;
1373
1374                         /* If the TIM IE is invalid, pretend the value is 1 */
1375                         if (!dtimper)
1376                                 dtimper = 1;
1377                         else if (dtimper > 1)
1378                                 maxslp = min_t(int, dtimper,
1379                                                     latency / beaconint_us);
1380
1381                         local->hw.conf.max_sleep_period = maxslp;
1382                         local->hw.conf.ps_dtim_period = dtimper;
1383                         local->ps_sdata = found;
1384                 }
1385         } else {
1386                 local->ps_sdata = NULL;
1387         }
1388
1389         ieee80211_change_ps(local);
1390 }
1391
1392 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1393 {
1394         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1395
1396         if (sdata->vif.bss_conf.ps != ps_allowed) {
1397                 sdata->vif.bss_conf.ps = ps_allowed;
1398                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1399         }
1400 }
1401
1402 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1403 {
1404         struct ieee80211_local *local =
1405                 container_of(work, struct ieee80211_local,
1406                              dynamic_ps_disable_work);
1407
1408         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1409                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1410                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1411         }
1412
1413         ieee80211_wake_queues_by_reason(&local->hw,
1414                                         IEEE80211_MAX_QUEUE_MAP,
1415                                         IEEE80211_QUEUE_STOP_REASON_PS,
1416                                         false);
1417 }
1418
1419 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1420 {
1421         struct ieee80211_local *local =
1422                 container_of(work, struct ieee80211_local,
1423                              dynamic_ps_enable_work);
1424         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1425         struct ieee80211_if_managed *ifmgd;
1426         unsigned long flags;
1427         int q;
1428
1429         /* can only happen when PS was just disabled anyway */
1430         if (!sdata)
1431                 return;
1432
1433         ifmgd = &sdata->u.mgd;
1434
1435         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1436                 return;
1437
1438         if (local->hw.conf.dynamic_ps_timeout > 0) {
1439                 /* don't enter PS if TX frames are pending */
1440                 if (drv_tx_frames_pending(local)) {
1441                         mod_timer(&local->dynamic_ps_timer, jiffies +
1442                                   msecs_to_jiffies(
1443                                   local->hw.conf.dynamic_ps_timeout));
1444                         return;
1445                 }
1446
1447                 /*
1448                  * transmission can be stopped by others which leads to
1449                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1450                  * is not the actual idle state.
1451                  */
1452                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1453                 for (q = 0; q < local->hw.queues; q++) {
1454                         if (local->queue_stop_reasons[q]) {
1455                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1456                                                        flags);
1457                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1458                                           msecs_to_jiffies(
1459                                           local->hw.conf.dynamic_ps_timeout));
1460                                 return;
1461                         }
1462                 }
1463                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1464         }
1465
1466         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1467             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1468                 if (drv_tx_frames_pending(local)) {
1469                         mod_timer(&local->dynamic_ps_timer, jiffies +
1470                                   msecs_to_jiffies(
1471                                   local->hw.conf.dynamic_ps_timeout));
1472                 } else {
1473                         ieee80211_send_nullfunc(local, sdata, 1);
1474                         /* Flush to get the tx status of nullfunc frame */
1475                         ieee80211_flush_queues(local, sdata);
1476                 }
1477         }
1478
1479         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1480               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1481             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1482                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1483                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1484                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1485         }
1486 }
1487
1488 void ieee80211_dynamic_ps_timer(unsigned long data)
1489 {
1490         struct ieee80211_local *local = (void *) data;
1491
1492         if (local->quiescing || local->suspended)
1493                 return;
1494
1495         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1496 }
1497
1498 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1499 {
1500         struct delayed_work *delayed_work =
1501                 container_of(work, struct delayed_work, work);
1502         struct ieee80211_sub_if_data *sdata =
1503                 container_of(delayed_work, struct ieee80211_sub_if_data,
1504                              dfs_cac_timer_work);
1505         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1506
1507         mutex_lock(&sdata->local->mtx);
1508         if (sdata->wdev.cac_started) {
1509                 ieee80211_vif_release_channel(sdata);
1510                 cfg80211_cac_event(sdata->dev, &chandef,
1511                                    NL80211_RADAR_CAC_FINISHED,
1512                                    GFP_KERNEL);
1513         }
1514         mutex_unlock(&sdata->local->mtx);
1515 }
1516
1517 /* MLME */
1518 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1519                                      struct ieee80211_sub_if_data *sdata,
1520                                      const u8 *wmm_param, size_t wmm_param_len)
1521 {
1522         struct ieee80211_tx_queue_params params;
1523         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1524         size_t left;
1525         int count;
1526         const u8 *pos;
1527         u8 uapsd_queues = 0;
1528
1529         if (!local->ops->conf_tx)
1530                 return false;
1531
1532         if (local->hw.queues < IEEE80211_NUM_ACS)
1533                 return false;
1534
1535         if (!wmm_param)
1536                 return false;
1537
1538         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1539                 return false;
1540
1541         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1542                 uapsd_queues = ifmgd->uapsd_queues;
1543
1544         count = wmm_param[6] & 0x0f;
1545         if (count == ifmgd->wmm_last_param_set)
1546                 return false;
1547         ifmgd->wmm_last_param_set = count;
1548
1549         pos = wmm_param + 8;
1550         left = wmm_param_len - 8;
1551
1552         memset(&params, 0, sizeof(params));
1553
1554         sdata->wmm_acm = 0;
1555         for (; left >= 4; left -= 4, pos += 4) {
1556                 int aci = (pos[0] >> 5) & 0x03;
1557                 int acm = (pos[0] >> 4) & 0x01;
1558                 bool uapsd = false;
1559                 int queue;
1560
1561                 switch (aci) {
1562                 case 1: /* AC_BK */
1563                         queue = 3;
1564                         if (acm)
1565                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1566                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1567                                 uapsd = true;
1568                         break;
1569                 case 2: /* AC_VI */
1570                         queue = 1;
1571                         if (acm)
1572                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1573                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1574                                 uapsd = true;
1575                         break;
1576                 case 3: /* AC_VO */
1577                         queue = 0;
1578                         if (acm)
1579                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1580                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1581                                 uapsd = true;
1582                         break;
1583                 case 0: /* AC_BE */
1584                 default:
1585                         queue = 2;
1586                         if (acm)
1587                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1588                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1589                                 uapsd = true;
1590                         break;
1591                 }
1592
1593                 params.aifs = pos[0] & 0x0f;
1594                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1595                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1596                 params.txop = get_unaligned_le16(pos + 2);
1597                 params.acm = acm;
1598                 params.uapsd = uapsd;
1599
1600                 mlme_dbg(sdata,
1601                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1602                          queue, aci, acm,
1603                          params.aifs, params.cw_min, params.cw_max,
1604                          params.txop, params.uapsd);
1605                 sdata->tx_conf[queue] = params;
1606                 if (drv_conf_tx(local, sdata, queue, &params))
1607                         sdata_err(sdata,
1608                                   "failed to set TX queue parameters for queue %d\n",
1609                                   queue);
1610         }
1611
1612         /* enable WMM or activate new settings */
1613         sdata->vif.bss_conf.qos = true;
1614         return true;
1615 }
1616
1617 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1618 {
1619         lockdep_assert_held(&sdata->local->mtx);
1620
1621         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1622         ieee80211_run_deferred_scan(sdata->local);
1623 }
1624
1625 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1626 {
1627         mutex_lock(&sdata->local->mtx);
1628         __ieee80211_stop_poll(sdata);
1629         mutex_unlock(&sdata->local->mtx);
1630 }
1631
1632 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1633                                            u16 capab, bool erp_valid, u8 erp)
1634 {
1635         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1636         u32 changed = 0;
1637         bool use_protection;
1638         bool use_short_preamble;
1639         bool use_short_slot;
1640
1641         if (erp_valid) {
1642                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1643                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1644         } else {
1645                 use_protection = false;
1646                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1647         }
1648
1649         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1650         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1651                 use_short_slot = true;
1652
1653         if (use_protection != bss_conf->use_cts_prot) {
1654                 bss_conf->use_cts_prot = use_protection;
1655                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1656         }
1657
1658         if (use_short_preamble != bss_conf->use_short_preamble) {
1659                 bss_conf->use_short_preamble = use_short_preamble;
1660                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1661         }
1662
1663         if (use_short_slot != bss_conf->use_short_slot) {
1664                 bss_conf->use_short_slot = use_short_slot;
1665                 changed |= BSS_CHANGED_ERP_SLOT;
1666         }
1667
1668         return changed;
1669 }
1670
1671 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1672                                      struct cfg80211_bss *cbss,
1673                                      u32 bss_info_changed)
1674 {
1675         struct ieee80211_bss *bss = (void *)cbss->priv;
1676         struct ieee80211_local *local = sdata->local;
1677         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1678
1679         bss_info_changed |= BSS_CHANGED_ASSOC;
1680         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1681                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1682
1683         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1684                 beacon_loss_count * bss_conf->beacon_int));
1685
1686         sdata->u.mgd.associated = cbss;
1687         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1688
1689         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1690
1691         if (sdata->vif.p2p) {
1692                 const struct cfg80211_bss_ies *ies;
1693
1694                 rcu_read_lock();
1695                 ies = rcu_dereference(cbss->ies);
1696                 if (ies) {
1697                         int ret;
1698
1699                         ret = cfg80211_get_p2p_attr(
1700                                         ies->data, ies->len,
1701                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1702                                         (u8 *) &bss_conf->p2p_noa_attr,
1703                                         sizeof(bss_conf->p2p_noa_attr));
1704                         if (ret >= 2) {
1705                                 sdata->u.mgd.p2p_noa_index =
1706                                         bss_conf->p2p_noa_attr.index;
1707                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1708                         }
1709                 }
1710                 rcu_read_unlock();
1711         }
1712
1713         /* just to be sure */
1714         ieee80211_stop_poll(sdata);
1715
1716         ieee80211_led_assoc(local, 1);
1717
1718         if (sdata->u.mgd.have_beacon) {
1719                 /*
1720                  * If the AP is buggy we may get here with no DTIM period
1721                  * known, so assume it's 1 which is the only safe assumption
1722                  * in that case, although if the TIM IE is broken powersave
1723                  * probably just won't work at all.
1724                  */
1725                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1726                 bss_conf->beacon_rate = bss->beacon_rate;
1727                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1728         } else {
1729                 bss_conf->beacon_rate = NULL;
1730                 bss_conf->dtim_period = 0;
1731         }
1732
1733         bss_conf->assoc = 1;
1734
1735         /* Tell the driver to monitor connection quality (if supported) */
1736         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1737             bss_conf->cqm_rssi_thold)
1738                 bss_info_changed |= BSS_CHANGED_CQM;
1739
1740         /* Enable ARP filtering */
1741         if (bss_conf->arp_addr_cnt)
1742                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1743
1744         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1745
1746         mutex_lock(&local->iflist_mtx);
1747         ieee80211_recalc_ps(local, -1);
1748         mutex_unlock(&local->iflist_mtx);
1749
1750         ieee80211_recalc_smps(sdata);
1751         ieee80211_recalc_ps_vif(sdata);
1752
1753         netif_carrier_on(sdata->dev);
1754 }
1755
1756 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1757                                    u16 stype, u16 reason, bool tx,
1758                                    u8 *frame_buf)
1759 {
1760         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1761         struct ieee80211_local *local = sdata->local;
1762         u32 changed = 0;
1763
1764         sdata_assert_lock(sdata);
1765
1766         if (WARN_ON_ONCE(tx && !frame_buf))
1767                 return;
1768
1769         if (WARN_ON(!ifmgd->associated))
1770                 return;
1771
1772         ieee80211_stop_poll(sdata);
1773
1774         ifmgd->associated = NULL;
1775         netif_carrier_off(sdata->dev);
1776
1777         /*
1778          * if we want to get out of ps before disassoc (why?) we have
1779          * to do it before sending disassoc, as otherwise the null-packet
1780          * won't be valid.
1781          */
1782         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1783                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1784                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1785         }
1786         local->ps_sdata = NULL;
1787
1788         /* disable per-vif ps */
1789         ieee80211_recalc_ps_vif(sdata);
1790
1791         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1792         if (tx)
1793                 ieee80211_flush_queues(local, sdata);
1794
1795         /* deauthenticate/disassociate now */
1796         if (tx || frame_buf)
1797                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1798                                                reason, tx, frame_buf);
1799
1800         /* flush out frame */
1801         if (tx)
1802                 ieee80211_flush_queues(local, sdata);
1803
1804         /* clear bssid only after building the needed mgmt frames */
1805         memset(ifmgd->bssid, 0, ETH_ALEN);
1806
1807         /* remove AP and TDLS peers */
1808         sta_info_flush(sdata);
1809
1810         /* finally reset all BSS / config parameters */
1811         changed |= ieee80211_reset_erp_info(sdata);
1812
1813         ieee80211_led_assoc(local, 0);
1814         changed |= BSS_CHANGED_ASSOC;
1815         sdata->vif.bss_conf.assoc = false;
1816
1817         ifmgd->p2p_noa_index = -1;
1818         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1819                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1820
1821         /* on the next assoc, re-program HT/VHT parameters */
1822         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1823         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1824         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1825         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1826
1827         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1828
1829         del_timer_sync(&local->dynamic_ps_timer);
1830         cancel_work_sync(&local->dynamic_ps_enable_work);
1831
1832         /* Disable ARP filtering */
1833         if (sdata->vif.bss_conf.arp_addr_cnt)
1834                 changed |= BSS_CHANGED_ARP_FILTER;
1835
1836         sdata->vif.bss_conf.qos = false;
1837         changed |= BSS_CHANGED_QOS;
1838
1839         /* The BSSID (not really interesting) and HT changed */
1840         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1841         ieee80211_bss_info_change_notify(sdata, changed);
1842
1843         /* disassociated - set to defaults now */
1844         ieee80211_set_wmm_default(sdata, false);
1845
1846         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1847         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1848         del_timer_sync(&sdata->u.mgd.timer);
1849         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1850
1851         sdata->vif.bss_conf.dtim_period = 0;
1852         sdata->vif.bss_conf.beacon_rate = NULL;
1853
1854         ifmgd->have_beacon = false;
1855
1856         ifmgd->flags = 0;
1857         mutex_lock(&local->mtx);
1858         ieee80211_vif_release_channel(sdata);
1859
1860         sdata->vif.csa_active = false;
1861         if (sdata->csa_block_tx) {
1862                 ieee80211_wake_vif_queues(local, sdata,
1863                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1864                 sdata->csa_block_tx = false;
1865         }
1866         mutex_unlock(&local->mtx);
1867
1868         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1869 }
1870
1871 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1872                              struct ieee80211_hdr *hdr)
1873 {
1874         /*
1875          * We can postpone the mgd.timer whenever receiving unicast frames
1876          * from AP because we know that the connection is working both ways
1877          * at that time. But multicast frames (and hence also beacons) must
1878          * be ignored here, because we need to trigger the timer during
1879          * data idle periods for sending the periodic probe request to the
1880          * AP we're connected to.
1881          */
1882         if (is_multicast_ether_addr(hdr->addr1))
1883                 return;
1884
1885         ieee80211_sta_reset_conn_monitor(sdata);
1886 }
1887
1888 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1889 {
1890         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1891         struct ieee80211_local *local = sdata->local;
1892
1893         mutex_lock(&local->mtx);
1894         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
1895                 goto out;
1896
1897         __ieee80211_stop_poll(sdata);
1898
1899         mutex_lock(&local->iflist_mtx);
1900         ieee80211_recalc_ps(local, -1);
1901         mutex_unlock(&local->iflist_mtx);
1902
1903         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1904                 goto out;
1905
1906         /*
1907          * We've received a probe response, but are not sure whether
1908          * we have or will be receiving any beacons or data, so let's
1909          * schedule the timers again, just in case.
1910          */
1911         ieee80211_sta_reset_beacon_monitor(sdata);
1912
1913         mod_timer(&ifmgd->conn_mon_timer,
1914                   round_jiffies_up(jiffies +
1915                                    IEEE80211_CONNECTION_IDLE_TIME));
1916 out:
1917         mutex_unlock(&local->mtx);
1918 }
1919
1920 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1921                              struct ieee80211_hdr *hdr, bool ack)
1922 {
1923         if (!ieee80211_is_data(hdr->frame_control))
1924             return;
1925
1926         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1927             sdata->u.mgd.probe_send_count > 0) {
1928                 if (ack)
1929                         ieee80211_sta_reset_conn_monitor(sdata);
1930                 else
1931                         sdata->u.mgd.nullfunc_failed = true;
1932                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1933                 return;
1934         }
1935
1936         if (ack)
1937                 ieee80211_sta_reset_conn_monitor(sdata);
1938 }
1939
1940 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1941 {
1942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1943         const u8 *ssid;
1944         u8 *dst = ifmgd->associated->bssid;
1945         u8 unicast_limit = max(1, max_probe_tries - 3);
1946
1947         /*
1948          * Try sending broadcast probe requests for the last three
1949          * probe requests after the first ones failed since some
1950          * buggy APs only support broadcast probe requests.
1951          */
1952         if (ifmgd->probe_send_count >= unicast_limit)
1953                 dst = NULL;
1954
1955         /*
1956          * When the hardware reports an accurate Tx ACK status, it's
1957          * better to send a nullfunc frame instead of a probe request,
1958          * as it will kick us off the AP quickly if we aren't associated
1959          * anymore. The timeout will be reset if the frame is ACKed by
1960          * the AP.
1961          */
1962         ifmgd->probe_send_count++;
1963
1964         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1965                 ifmgd->nullfunc_failed = false;
1966                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1967         } else {
1968                 int ssid_len;
1969
1970                 rcu_read_lock();
1971                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1972                 if (WARN_ON_ONCE(ssid == NULL))
1973                         ssid_len = 0;
1974                 else
1975                         ssid_len = ssid[1];
1976
1977                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1978                                          0, (u32) -1, true, 0,
1979                                          ifmgd->associated->channel, false);
1980                 rcu_read_unlock();
1981         }
1982
1983         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1984         run_again(sdata, ifmgd->probe_timeout);
1985         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1986                 ieee80211_flush_queues(sdata->local, sdata);
1987 }
1988
1989 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1990                                    bool beacon)
1991 {
1992         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1993         bool already = false;
1994
1995         if (!ieee80211_sdata_running(sdata))
1996                 return;
1997
1998         sdata_lock(sdata);
1999
2000         if (!ifmgd->associated)
2001                 goto out;
2002
2003         mutex_lock(&sdata->local->mtx);
2004
2005         if (sdata->local->tmp_channel || sdata->local->scanning) {
2006                 mutex_unlock(&sdata->local->mtx);
2007                 goto out;
2008         }
2009
2010         if (beacon) {
2011                 mlme_dbg_ratelimited(sdata,
2012                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2013                                      beacon_loss_count);
2014
2015                 ieee80211_cqm_rssi_notify(&sdata->vif,
2016                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
2017                                           GFP_KERNEL);
2018         }
2019
2020         /*
2021          * The driver/our work has already reported this event or the
2022          * connection monitoring has kicked in and we have already sent
2023          * a probe request. Or maybe the AP died and the driver keeps
2024          * reporting until we disassociate...
2025          *
2026          * In either case we have to ignore the current call to this
2027          * function (except for setting the correct probe reason bit)
2028          * because otherwise we would reset the timer every time and
2029          * never check whether we received a probe response!
2030          */
2031         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2032                 already = true;
2033
2034         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2035
2036         mutex_unlock(&sdata->local->mtx);
2037
2038         if (already)
2039                 goto out;
2040
2041         mutex_lock(&sdata->local->iflist_mtx);
2042         ieee80211_recalc_ps(sdata->local, -1);
2043         mutex_unlock(&sdata->local->iflist_mtx);
2044
2045         ifmgd->probe_send_count = 0;
2046         ieee80211_mgd_probe_ap_send(sdata);
2047  out:
2048         sdata_unlock(sdata);
2049 }
2050
2051 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2052                                           struct ieee80211_vif *vif)
2053 {
2054         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2055         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2056         struct cfg80211_bss *cbss;
2057         struct sk_buff *skb;
2058         const u8 *ssid;
2059         int ssid_len;
2060
2061         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2062                 return NULL;
2063
2064         sdata_assert_lock(sdata);
2065
2066         if (ifmgd->associated)
2067                 cbss = ifmgd->associated;
2068         else if (ifmgd->auth_data)
2069                 cbss = ifmgd->auth_data->bss;
2070         else if (ifmgd->assoc_data)
2071                 cbss = ifmgd->assoc_data->bss;
2072         else
2073                 return NULL;
2074
2075         rcu_read_lock();
2076         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2077         if (WARN_ON_ONCE(ssid == NULL))
2078                 ssid_len = 0;
2079         else
2080                 ssid_len = ssid[1];
2081
2082         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2083                                         (u32) -1, cbss->channel,
2084                                         ssid + 2, ssid_len,
2085                                         NULL, 0, true);
2086         rcu_read_unlock();
2087
2088         return skb;
2089 }
2090 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2091
2092 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2093 {
2094         struct ieee80211_local *local = sdata->local;
2095         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2096         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2097
2098         sdata_lock(sdata);
2099         if (!ifmgd->associated) {
2100                 sdata_unlock(sdata);
2101                 return;
2102         }
2103
2104         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2105                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2106                                true, frame_buf);
2107         mutex_lock(&local->mtx);
2108         sdata->vif.csa_active = false;
2109         if (sdata->csa_block_tx) {
2110                 ieee80211_wake_vif_queues(local, sdata,
2111                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2112                 sdata->csa_block_tx = false;
2113         }
2114         mutex_unlock(&local->mtx);
2115
2116         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2117                               IEEE80211_DEAUTH_FRAME_LEN);
2118         sdata_unlock(sdata);
2119 }
2120
2121 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2122 {
2123         struct ieee80211_sub_if_data *sdata =
2124                 container_of(work, struct ieee80211_sub_if_data,
2125                              u.mgd.beacon_connection_loss_work);
2126         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2127         struct sta_info *sta;
2128
2129         if (ifmgd->associated) {
2130                 rcu_read_lock();
2131                 sta = sta_info_get(sdata, ifmgd->bssid);
2132                 if (sta)
2133                         sta->beacon_loss_count++;
2134                 rcu_read_unlock();
2135         }
2136
2137         if (ifmgd->connection_loss) {
2138                 sdata_info(sdata, "Connection to AP %pM lost\n",
2139                            ifmgd->bssid);
2140                 __ieee80211_disconnect(sdata);
2141         } else {
2142                 ieee80211_mgd_probe_ap(sdata, true);
2143         }
2144 }
2145
2146 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2147 {
2148         struct ieee80211_sub_if_data *sdata =
2149                 container_of(work, struct ieee80211_sub_if_data,
2150                              u.mgd.csa_connection_drop_work);
2151
2152         __ieee80211_disconnect(sdata);
2153 }
2154
2155 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2156 {
2157         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2158         struct ieee80211_hw *hw = &sdata->local->hw;
2159
2160         trace_api_beacon_loss(sdata);
2161
2162         sdata->u.mgd.connection_loss = false;
2163         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2164 }
2165 EXPORT_SYMBOL(ieee80211_beacon_loss);
2166
2167 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2168 {
2169         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2170         struct ieee80211_hw *hw = &sdata->local->hw;
2171
2172         trace_api_connection_loss(sdata);
2173
2174         sdata->u.mgd.connection_loss = true;
2175         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2176 }
2177 EXPORT_SYMBOL(ieee80211_connection_loss);
2178
2179
2180 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2181                                         bool assoc)
2182 {
2183         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2184
2185         sdata_assert_lock(sdata);
2186
2187         if (!assoc) {
2188                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2189
2190                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2191                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2192                 sdata->u.mgd.flags = 0;
2193                 mutex_lock(&sdata->local->mtx);
2194                 ieee80211_vif_release_channel(sdata);
2195                 mutex_unlock(&sdata->local->mtx);
2196         }
2197
2198         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2199         kfree(auth_data);
2200         sdata->u.mgd.auth_data = NULL;
2201 }
2202
2203 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2204                                      struct ieee80211_mgmt *mgmt, size_t len)
2205 {
2206         struct ieee80211_local *local = sdata->local;
2207         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2208         u8 *pos;
2209         struct ieee802_11_elems elems;
2210         u32 tx_flags = 0;
2211
2212         pos = mgmt->u.auth.variable;
2213         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2214         if (!elems.challenge)
2215                 return;
2216         auth_data->expected_transaction = 4;
2217         drv_mgd_prepare_tx(sdata->local, sdata);
2218         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2219                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2220                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2221         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2222                             elems.challenge - 2, elems.challenge_len + 2,
2223                             auth_data->bss->bssid, auth_data->bss->bssid,
2224                             auth_data->key, auth_data->key_len,
2225                             auth_data->key_idx, tx_flags);
2226 }
2227
2228 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2229                                    struct ieee80211_mgmt *mgmt, size_t len)
2230 {
2231         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2232         u8 bssid[ETH_ALEN];
2233         u16 auth_alg, auth_transaction, status_code;
2234         struct sta_info *sta;
2235
2236         sdata_assert_lock(sdata);
2237
2238         if (len < 24 + 6)
2239                 return;
2240
2241         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2242                 return;
2243
2244         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2245
2246         if (!ether_addr_equal(bssid, mgmt->bssid))
2247                 return;
2248
2249         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2250         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2251         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2252
2253         if (auth_alg != ifmgd->auth_data->algorithm ||
2254             auth_transaction != ifmgd->auth_data->expected_transaction) {
2255                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2256                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2257                            auth_transaction,
2258                            ifmgd->auth_data->expected_transaction);
2259                 return;
2260         }
2261
2262         if (status_code != WLAN_STATUS_SUCCESS) {
2263                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2264                            mgmt->sa, status_code);
2265                 ieee80211_destroy_auth_data(sdata, false);
2266                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2267                 return;
2268         }
2269
2270         switch (ifmgd->auth_data->algorithm) {
2271         case WLAN_AUTH_OPEN:
2272         case WLAN_AUTH_LEAP:
2273         case WLAN_AUTH_FT:
2274         case WLAN_AUTH_SAE:
2275                 break;
2276         case WLAN_AUTH_SHARED_KEY:
2277                 if (ifmgd->auth_data->expected_transaction != 4) {
2278                         ieee80211_auth_challenge(sdata, mgmt, len);
2279                         /* need another frame */
2280                         return;
2281                 }
2282                 break;
2283         default:
2284                 WARN_ONCE(1, "invalid auth alg %d",
2285                           ifmgd->auth_data->algorithm);
2286                 return;
2287         }
2288
2289         sdata_info(sdata, "authenticated\n");
2290         ifmgd->auth_data->done = true;
2291         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2292         ifmgd->auth_data->timeout_started = true;
2293         run_again(sdata, ifmgd->auth_data->timeout);
2294
2295         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2296             ifmgd->auth_data->expected_transaction != 2) {
2297                 /*
2298                  * Report auth frame to user space for processing since another
2299                  * round of Authentication frames is still needed.
2300                  */
2301                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2302                 return;
2303         }
2304
2305         /* move station state to auth */
2306         mutex_lock(&sdata->local->sta_mtx);
2307         sta = sta_info_get(sdata, bssid);
2308         if (!sta) {
2309                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2310                 goto out_err;
2311         }
2312         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2313                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2314                 goto out_err;
2315         }
2316         mutex_unlock(&sdata->local->sta_mtx);
2317
2318         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2319         return;
2320  out_err:
2321         mutex_unlock(&sdata->local->sta_mtx);
2322         /* ignore frame -- wait for timeout */
2323 }
2324
2325 #define case_WLAN(type) \
2326         case WLAN_REASON_##type: return #type
2327
2328 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2329 {
2330         switch (reason_code) {
2331         case_WLAN(UNSPECIFIED);
2332         case_WLAN(PREV_AUTH_NOT_VALID);
2333         case_WLAN(DEAUTH_LEAVING);
2334         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2335         case_WLAN(DISASSOC_AP_BUSY);
2336         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2337         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2338         case_WLAN(DISASSOC_STA_HAS_LEFT);
2339         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2340         case_WLAN(DISASSOC_BAD_POWER);
2341         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2342         case_WLAN(INVALID_IE);
2343         case_WLAN(MIC_FAILURE);
2344         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2345         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2346         case_WLAN(IE_DIFFERENT);
2347         case_WLAN(INVALID_GROUP_CIPHER);
2348         case_WLAN(INVALID_PAIRWISE_CIPHER);
2349         case_WLAN(INVALID_AKMP);
2350         case_WLAN(UNSUPP_RSN_VERSION);
2351         case_WLAN(INVALID_RSN_IE_CAP);
2352         case_WLAN(IEEE8021X_FAILED);
2353         case_WLAN(CIPHER_SUITE_REJECTED);
2354         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2355         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2356         case_WLAN(DISASSOC_LOW_ACK);
2357         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2358         case_WLAN(QSTA_LEAVE_QBSS);
2359         case_WLAN(QSTA_NOT_USE);
2360         case_WLAN(QSTA_REQUIRE_SETUP);
2361         case_WLAN(QSTA_TIMEOUT);
2362         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2363         case_WLAN(MESH_PEER_CANCELED);
2364         case_WLAN(MESH_MAX_PEERS);
2365         case_WLAN(MESH_CONFIG);
2366         case_WLAN(MESH_CLOSE);
2367         case_WLAN(MESH_MAX_RETRIES);
2368         case_WLAN(MESH_CONFIRM_TIMEOUT);
2369         case_WLAN(MESH_INVALID_GTK);
2370         case_WLAN(MESH_INCONSISTENT_PARAM);
2371         case_WLAN(MESH_INVALID_SECURITY);
2372         case_WLAN(MESH_PATH_ERROR);
2373         case_WLAN(MESH_PATH_NOFORWARD);
2374         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2375         case_WLAN(MAC_EXISTS_IN_MBSS);
2376         case_WLAN(MESH_CHAN_REGULATORY);
2377         case_WLAN(MESH_CHAN);
2378         default: return "<unknown>";
2379         }
2380 }
2381
2382 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2383                                      struct ieee80211_mgmt *mgmt, size_t len)
2384 {
2385         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2386         const u8 *bssid = NULL;
2387         u16 reason_code;
2388
2389         sdata_assert_lock(sdata);
2390
2391         if (len < 24 + 2)
2392                 return;
2393
2394         if (!ifmgd->associated ||
2395             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2396                 return;
2397
2398         bssid = ifmgd->associated->bssid;
2399
2400         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2401
2402         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2403                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2404
2405         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2406
2407         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2408 }
2409
2410
2411 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2412                                        struct ieee80211_mgmt *mgmt, size_t len)
2413 {
2414         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2415         u16 reason_code;
2416
2417         sdata_assert_lock(sdata);
2418
2419         if (len < 24 + 2)
2420                 return;
2421
2422         if (!ifmgd->associated ||
2423             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2424                 return;
2425
2426         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2427
2428         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2429                    mgmt->sa, reason_code);
2430
2431         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2432
2433         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2434 }
2435
2436 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2437                                 u8 *supp_rates, unsigned int supp_rates_len,
2438                                 u32 *rates, u32 *basic_rates,
2439                                 bool *have_higher_than_11mbit,
2440                                 int *min_rate, int *min_rate_index,
2441                                 int shift, u32 rate_flags)
2442 {
2443         int i, j;
2444
2445         for (i = 0; i < supp_rates_len; i++) {
2446                 int rate = supp_rates[i] & 0x7f;
2447                 bool is_basic = !!(supp_rates[i] & 0x80);
2448
2449                 if ((rate * 5 * (1 << shift)) > 110)
2450                         *have_higher_than_11mbit = true;
2451
2452                 /*
2453                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2454                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2455                  *
2456                  * Note: Even through the membership selector and the basic
2457                  *       rate flag share the same bit, they are not exactly
2458                  *       the same.
2459                  */
2460                 if (!!(supp_rates[i] & 0x80) &&
2461                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2462                         continue;
2463
2464                 for (j = 0; j < sband->n_bitrates; j++) {
2465                         struct ieee80211_rate *br;
2466                         int brate;
2467
2468                         br = &sband->bitrates[j];
2469                         if ((rate_flags & br->flags) != rate_flags)
2470                                 continue;
2471
2472                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2473                         if (brate == rate) {
2474                                 *rates |= BIT(j);
2475                                 if (is_basic)
2476                                         *basic_rates |= BIT(j);
2477                                 if ((rate * 5) < *min_rate) {
2478                                         *min_rate = rate * 5;
2479                                         *min_rate_index = j;
2480                                 }
2481                                 break;
2482                         }
2483                 }
2484         }
2485 }
2486
2487 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2488                                          bool assoc)
2489 {
2490         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2491
2492         sdata_assert_lock(sdata);
2493
2494         if (!assoc) {
2495                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2496
2497                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2498                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2499                 sdata->u.mgd.flags = 0;
2500                 mutex_lock(&sdata->local->mtx);
2501                 ieee80211_vif_release_channel(sdata);
2502                 mutex_unlock(&sdata->local->mtx);
2503         }
2504
2505         kfree(assoc_data);
2506         sdata->u.mgd.assoc_data = NULL;
2507 }
2508
2509 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2510                                     struct cfg80211_bss *cbss,
2511                                     struct ieee80211_mgmt *mgmt, size_t len)
2512 {
2513         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2514         struct ieee80211_local *local = sdata->local;
2515         struct ieee80211_supported_band *sband;
2516         struct sta_info *sta;
2517         u8 *pos;
2518         u16 capab_info, aid;
2519         struct ieee802_11_elems elems;
2520         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2521         const struct cfg80211_bss_ies *bss_ies = NULL;
2522         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2523         u32 changed = 0;
2524         int err;
2525         bool ret;
2526
2527         /* AssocResp and ReassocResp have identical structure */
2528
2529         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2530         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2531
2532         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2533                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2534                            aid);
2535         aid &= ~(BIT(15) | BIT(14));
2536
2537         ifmgd->broken_ap = false;
2538
2539         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2540                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2541                            aid);
2542                 aid = 0;
2543                 ifmgd->broken_ap = true;
2544         }
2545
2546         pos = mgmt->u.assoc_resp.variable;
2547         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2548
2549         if (!elems.supp_rates) {
2550                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2551                 return false;
2552         }
2553
2554         ifmgd->aid = aid;
2555
2556         /*
2557          * Some APs are erroneously not including some information in their
2558          * (re)association response frames. Try to recover by using the data
2559          * from the beacon or probe response. This seems to afflict mobile
2560          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2561          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2562          */
2563         if ((assoc_data->wmm && !elems.wmm_param) ||
2564             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2565              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2566             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2567              (!elems.vht_cap_elem || !elems.vht_operation))) {
2568                 const struct cfg80211_bss_ies *ies;
2569                 struct ieee802_11_elems bss_elems;
2570
2571                 rcu_read_lock();
2572                 ies = rcu_dereference(cbss->ies);
2573                 if (ies)
2574                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2575                                           GFP_ATOMIC);
2576                 rcu_read_unlock();
2577                 if (!bss_ies)
2578                         return false;
2579
2580                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2581                                        false, &bss_elems);
2582                 if (assoc_data->wmm &&
2583                     !elems.wmm_param && bss_elems.wmm_param) {
2584                         elems.wmm_param = bss_elems.wmm_param;
2585                         sdata_info(sdata,
2586                                    "AP bug: WMM param missing from AssocResp\n");
2587                 }
2588
2589                 /*
2590                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2591                  * have to include the IEs in the (re)association response.
2592                  */
2593                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2594                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2595                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2596                         sdata_info(sdata,
2597                                    "AP bug: HT capability missing from AssocResp\n");
2598                 }
2599                 if (!elems.ht_operation && bss_elems.ht_operation &&
2600                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2601                         elems.ht_operation = bss_elems.ht_operation;
2602                         sdata_info(sdata,
2603                                    "AP bug: HT operation missing from AssocResp\n");
2604                 }
2605                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2606                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2607                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2608                         sdata_info(sdata,
2609                                    "AP bug: VHT capa missing from AssocResp\n");
2610                 }
2611                 if (!elems.vht_operation && bss_elems.vht_operation &&
2612                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2613                         elems.vht_operation = bss_elems.vht_operation;
2614                         sdata_info(sdata,
2615                                    "AP bug: VHT operation missing from AssocResp\n");
2616                 }
2617         }
2618
2619         /*
2620          * We previously checked these in the beacon/probe response, so
2621          * they should be present here. This is just a safety net.
2622          */
2623         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2624             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2625                 sdata_info(sdata,
2626                            "HT AP is missing WMM params or HT capability/operation\n");
2627                 ret = false;
2628                 goto out;
2629         }
2630
2631         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2632             (!elems.vht_cap_elem || !elems.vht_operation)) {
2633                 sdata_info(sdata,
2634                            "VHT AP is missing VHT capability/operation\n");
2635                 ret = false;
2636                 goto out;
2637         }
2638
2639         mutex_lock(&sdata->local->sta_mtx);
2640         /*
2641          * station info was already allocated and inserted before
2642          * the association and should be available to us
2643          */
2644         sta = sta_info_get(sdata, cbss->bssid);
2645         if (WARN_ON(!sta)) {
2646                 mutex_unlock(&sdata->local->sta_mtx);
2647                 ret = false;
2648                 goto out;
2649         }
2650
2651         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2652
2653         /* Set up internal HT/VHT capabilities */
2654         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2655                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2656                                                   elems.ht_cap_elem, sta);
2657
2658         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2659                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2660                                                     elems.vht_cap_elem, sta);
2661
2662         /*
2663          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2664          * in their association response, so ignore that data for our own
2665          * configuration. If it changed since the last beacon, we'll get the
2666          * next beacon and update then.
2667          */
2668
2669         /*
2670          * If an operating mode notification IE is present, override the
2671          * NSS calculation (that would be done in rate_control_rate_init())
2672          * and use the # of streams from that element.
2673          */
2674         if (elems.opmode_notif &&
2675             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2676                 u8 nss;
2677
2678                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2679                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2680                 nss += 1;
2681                 sta->sta.rx_nss = nss;
2682         }
2683
2684         rate_control_rate_init(sta);
2685
2686         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2687                 set_sta_flag(sta, WLAN_STA_MFP);
2688
2689         sta->sta.wme = elems.wmm_param;
2690
2691         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2692         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2693                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2694         if (err) {
2695                 sdata_info(sdata,
2696                            "failed to move station %pM to desired state\n",
2697                            sta->sta.addr);
2698                 WARN_ON(__sta_info_destroy(sta));
2699                 mutex_unlock(&sdata->local->sta_mtx);
2700                 ret = false;
2701                 goto out;
2702         }
2703
2704         mutex_unlock(&sdata->local->sta_mtx);
2705
2706         /*
2707          * Always handle WMM once after association regardless
2708          * of the first value the AP uses. Setting -1 here has
2709          * that effect because the AP values is an unsigned
2710          * 4-bit value.
2711          */
2712         ifmgd->wmm_last_param_set = -1;
2713
2714         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2715                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2716                                          elems.wmm_param_len);
2717         else
2718                 ieee80211_set_wmm_default(sdata, false);
2719         changed |= BSS_CHANGED_QOS;
2720
2721         /* set AID and assoc capability,
2722          * ieee80211_set_associated() will tell the driver */
2723         bss_conf->aid = aid;
2724         bss_conf->assoc_capability = capab_info;
2725         ieee80211_set_associated(sdata, cbss, changed);
2726
2727         /*
2728          * If we're using 4-addr mode, let the AP know that we're
2729          * doing so, so that it can create the STA VLAN on its side
2730          */
2731         if (ifmgd->use_4addr)
2732                 ieee80211_send_4addr_nullfunc(local, sdata);
2733
2734         /*
2735          * Start timer to probe the connection to the AP now.
2736          * Also start the timer that will detect beacon loss.
2737          */
2738         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2739         ieee80211_sta_reset_beacon_monitor(sdata);
2740
2741         ret = true;
2742  out:
2743         kfree(bss_ies);
2744         return ret;
2745 }
2746
2747 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2748                                          struct ieee80211_mgmt *mgmt,
2749                                          size_t len)
2750 {
2751         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2752         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2753         u16 capab_info, status_code, aid;
2754         struct ieee802_11_elems elems;
2755         u8 *pos;
2756         bool reassoc;
2757         struct cfg80211_bss *bss;
2758
2759         sdata_assert_lock(sdata);
2760
2761         if (!assoc_data)
2762                 return;
2763         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2764                 return;
2765
2766         /*
2767          * AssocResp and ReassocResp have identical structure, so process both
2768          * of them in this function.
2769          */
2770
2771         if (len < 24 + 6)
2772                 return;
2773
2774         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2775         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2776         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2777         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2778
2779         sdata_info(sdata,
2780                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2781                    reassoc ? "Rea" : "A", mgmt->sa,
2782                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2783
2784         pos = mgmt->u.assoc_resp.variable;
2785         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2786
2787         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2788             elems.timeout_int &&
2789             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2790                 u32 tu, ms;
2791                 tu = le32_to_cpu(elems.timeout_int->value);
2792                 ms = tu * 1024 / 1000;
2793                 sdata_info(sdata,
2794                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2795                            mgmt->sa, tu, ms);
2796                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2797                 assoc_data->timeout_started = true;
2798                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2799                         run_again(sdata, assoc_data->timeout);
2800                 return;
2801         }
2802
2803         bss = assoc_data->bss;
2804
2805         if (status_code != WLAN_STATUS_SUCCESS) {
2806                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2807                            mgmt->sa, status_code);
2808                 ieee80211_destroy_assoc_data(sdata, false);
2809         } else {
2810                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2811                         /* oops -- internal error -- send timeout for now */
2812                         ieee80211_destroy_assoc_data(sdata, false);
2813                         cfg80211_assoc_timeout(sdata->dev, bss);
2814                         return;
2815                 }
2816                 sdata_info(sdata, "associated\n");
2817
2818                 /*
2819                  * destroy assoc_data afterwards, as otherwise an idle
2820                  * recalc after assoc_data is NULL but before associated
2821                  * is set can cause the interface to go idle
2822                  */
2823                 ieee80211_destroy_assoc_data(sdata, true);
2824         }
2825
2826         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
2827 }
2828
2829 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2830                                   struct ieee80211_mgmt *mgmt, size_t len,
2831                                   struct ieee80211_rx_status *rx_status,
2832                                   struct ieee802_11_elems *elems)
2833 {
2834         struct ieee80211_local *local = sdata->local;
2835         struct ieee80211_bss *bss;
2836         struct ieee80211_channel *channel;
2837
2838         sdata_assert_lock(sdata);
2839
2840         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
2841         if (!channel)
2842                 return;
2843
2844         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2845                                         channel);
2846         if (bss) {
2847                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2848                 ieee80211_rx_bss_put(local, bss);
2849         }
2850 }
2851
2852
2853 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2854                                          struct sk_buff *skb)
2855 {
2856         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2857         struct ieee80211_if_managed *ifmgd;
2858         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2859         size_t baselen, len = skb->len;
2860         struct ieee802_11_elems elems;
2861
2862         ifmgd = &sdata->u.mgd;
2863
2864         sdata_assert_lock(sdata);
2865
2866         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2867                 return; /* ignore ProbeResp to foreign address */
2868
2869         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2870         if (baselen > len)
2871                 return;
2872
2873         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2874                                false, &elems);
2875
2876         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2877
2878         if (ifmgd->associated &&
2879             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2880                 ieee80211_reset_ap_probe(sdata);
2881
2882         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2883             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2884                 /* got probe response, continue with auth */
2885                 sdata_info(sdata, "direct probe responded\n");
2886                 ifmgd->auth_data->tries = 0;
2887                 ifmgd->auth_data->timeout = jiffies;
2888                 ifmgd->auth_data->timeout_started = true;
2889                 run_again(sdata, ifmgd->auth_data->timeout);
2890         }
2891 }
2892
2893 /*
2894  * This is the canonical list of information elements we care about,
2895  * the filter code also gives us all changes to the Microsoft OUI
2896  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2897  *
2898  * We implement beacon filtering in software since that means we can
2899  * avoid processing the frame here and in cfg80211, and userspace
2900  * will not be able to tell whether the hardware supports it or not.
2901  *
2902  * XXX: This list needs to be dynamic -- userspace needs to be able to
2903  *      add items it requires. It also needs to be able to tell us to
2904  *      look out for other vendor IEs.
2905  */
2906 static const u64 care_about_ies =
2907         (1ULL << WLAN_EID_COUNTRY) |
2908         (1ULL << WLAN_EID_ERP_INFO) |
2909         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2910         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2911         (1ULL << WLAN_EID_HT_CAPABILITY) |
2912         (1ULL << WLAN_EID_HT_OPERATION);
2913
2914 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2915                                      struct ieee80211_mgmt *mgmt, size_t len,
2916                                      struct ieee80211_rx_status *rx_status)
2917 {
2918         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2919         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2920         size_t baselen;
2921         struct ieee802_11_elems elems;
2922         struct ieee80211_local *local = sdata->local;
2923         struct ieee80211_chanctx_conf *chanctx_conf;
2924         struct ieee80211_channel *chan;
2925         struct sta_info *sta;
2926         u32 changed = 0;
2927         bool erp_valid;
2928         u8 erp_value = 0;
2929         u32 ncrc;
2930         u8 *bssid;
2931         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2932
2933         sdata_assert_lock(sdata);
2934
2935         /* Process beacon from the current BSS */
2936         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2937         if (baselen > len)
2938                 return;
2939
2940         rcu_read_lock();
2941         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2942         if (!chanctx_conf) {
2943                 rcu_read_unlock();
2944                 return;
2945         }
2946
2947         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2948                 rcu_read_unlock();
2949                 return;
2950         }
2951         chan = chanctx_conf->def.chan;
2952         rcu_read_unlock();
2953
2954         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2955             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2956                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2957                                        len - baselen, false, &elems);
2958
2959                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2960                 if (elems.tim && !elems.parse_error) {
2961                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
2962                         ifmgd->dtim_period = tim_ie->dtim_period;
2963                 }
2964                 ifmgd->have_beacon = true;
2965                 ifmgd->assoc_data->need_beacon = false;
2966                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
2967                         sdata->vif.bss_conf.sync_tsf =
2968                                 le64_to_cpu(mgmt->u.beacon.timestamp);
2969                         sdata->vif.bss_conf.sync_device_ts =
2970                                 rx_status->device_timestamp;
2971                         if (elems.tim)
2972                                 sdata->vif.bss_conf.sync_dtim_count =
2973                                         elems.tim->dtim_count;
2974                         else
2975                                 sdata->vif.bss_conf.sync_dtim_count = 0;
2976                 }
2977                 /* continue assoc process */
2978                 ifmgd->assoc_data->timeout = jiffies;
2979                 ifmgd->assoc_data->timeout_started = true;
2980                 run_again(sdata, ifmgd->assoc_data->timeout);
2981                 return;
2982         }
2983
2984         if (!ifmgd->associated ||
2985             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2986                 return;
2987         bssid = ifmgd->associated->bssid;
2988
2989         /* Track average RSSI from the Beacon frames of the current AP */
2990         ifmgd->last_beacon_signal = rx_status->signal;
2991         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2992                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2993                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2994                 ifmgd->last_cqm_event_signal = 0;
2995                 ifmgd->count_beacon_signal = 1;
2996                 ifmgd->last_ave_beacon_signal = 0;
2997         } else {
2998                 ifmgd->ave_beacon_signal =
2999                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3000                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3001                          ifmgd->ave_beacon_signal) / 16;
3002                 ifmgd->count_beacon_signal++;
3003         }
3004
3005         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3006             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3007                 int sig = ifmgd->ave_beacon_signal;
3008                 int last_sig = ifmgd->last_ave_beacon_signal;
3009
3010                 /*
3011                  * if signal crosses either of the boundaries, invoke callback
3012                  * with appropriate parameters
3013                  */
3014                 if (sig > ifmgd->rssi_max_thold &&
3015                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3016                         ifmgd->last_ave_beacon_signal = sig;
3017                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3018                 } else if (sig < ifmgd->rssi_min_thold &&
3019                            (last_sig >= ifmgd->rssi_max_thold ||
3020                            last_sig == 0)) {
3021                         ifmgd->last_ave_beacon_signal = sig;
3022                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3023                 }
3024         }
3025
3026         if (bss_conf->cqm_rssi_thold &&
3027             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3028             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3029                 int sig = ifmgd->ave_beacon_signal / 16;
3030                 int last_event = ifmgd->last_cqm_event_signal;
3031                 int thold = bss_conf->cqm_rssi_thold;
3032                 int hyst = bss_conf->cqm_rssi_hyst;
3033                 if (sig < thold &&
3034                     (last_event == 0 || sig < last_event - hyst)) {
3035                         ifmgd->last_cqm_event_signal = sig;
3036                         ieee80211_cqm_rssi_notify(
3037                                 &sdata->vif,
3038                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3039                                 GFP_KERNEL);
3040                 } else if (sig > thold &&
3041                            (last_event == 0 || sig > last_event + hyst)) {
3042                         ifmgd->last_cqm_event_signal = sig;
3043                         ieee80211_cqm_rssi_notify(
3044                                 &sdata->vif,
3045                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3046                                 GFP_KERNEL);
3047                 }
3048         }
3049
3050         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3051                 mlme_dbg_ratelimited(sdata,
3052                                      "cancelling AP probe due to a received beacon\n");
3053                 ieee80211_reset_ap_probe(sdata);
3054         }
3055
3056         /*
3057          * Push the beacon loss detection into the future since
3058          * we are processing a beacon from the AP just now.
3059          */
3060         ieee80211_sta_reset_beacon_monitor(sdata);
3061
3062         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3063         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3064                                           len - baselen, false, &elems,
3065                                           care_about_ies, ncrc);
3066
3067         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3068                 bool directed_tim = ieee80211_check_tim(elems.tim,
3069                                                         elems.tim_len,
3070                                                         ifmgd->aid);
3071                 if (directed_tim) {
3072                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3073                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3074                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3075                                         ieee80211_hw_config(local,
3076                                                             IEEE80211_CONF_CHANGE_PS);
3077                                 }
3078                                 ieee80211_send_nullfunc(local, sdata, 0);
3079                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3080                                 local->pspolling = true;
3081
3082                                 /*
3083                                  * Here is assumed that the driver will be
3084                                  * able to send ps-poll frame and receive a
3085                                  * response even though power save mode is
3086                                  * enabled, but some drivers might require
3087                                  * to disable power save here. This needs
3088                                  * to be investigated.
3089                                  */
3090                                 ieee80211_send_pspoll(local, sdata);
3091                         }
3092                 }
3093         }
3094
3095         if (sdata->vif.p2p) {
3096                 struct ieee80211_p2p_noa_attr noa = {};
3097                 int ret;
3098
3099                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3100                                             len - baselen,
3101                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3102                                             (u8 *) &noa, sizeof(noa));
3103                 if (ret >= 2) {
3104                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3105                                 /* valid noa_attr and index changed */
3106                                 sdata->u.mgd.p2p_noa_index = noa.index;
3107                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3108                                 changed |= BSS_CHANGED_P2P_PS;
3109                                 /*
3110                                  * make sure we update all information, the CRC
3111                                  * mechanism doesn't look at P2P attributes.
3112                                  */
3113                                 ifmgd->beacon_crc_valid = false;
3114                         }
3115                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3116                         /* noa_attr not found and we had valid noa_attr before */
3117                         sdata->u.mgd.p2p_noa_index = -1;
3118                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3119                         changed |= BSS_CHANGED_P2P_PS;
3120                         ifmgd->beacon_crc_valid = false;
3121                 }
3122         }
3123
3124         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3125                 return;
3126         ifmgd->beacon_crc = ncrc;
3127         ifmgd->beacon_crc_valid = true;
3128
3129         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3130
3131         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3132                                          &elems, true);
3133
3134         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3135             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3136                                      elems.wmm_param_len))
3137                 changed |= BSS_CHANGED_QOS;
3138
3139         /*
3140          * If we haven't had a beacon before, tell the driver about the
3141          * DTIM period (and beacon timing if desired) now.
3142          */
3143         if (!ifmgd->have_beacon) {
3144                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3145                 if (elems.tim)
3146                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3147                 else
3148                         bss_conf->dtim_period = 1;
3149
3150                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3151                         sdata->vif.bss_conf.sync_tsf =
3152                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3153                         sdata->vif.bss_conf.sync_device_ts =
3154                                 rx_status->device_timestamp;
3155                         if (elems.tim)
3156                                 sdata->vif.bss_conf.sync_dtim_count =
3157                                         elems.tim->dtim_count;
3158                         else
3159                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3160                 }
3161
3162                 changed |= BSS_CHANGED_BEACON_INFO;
3163                 ifmgd->have_beacon = true;
3164
3165                 mutex_lock(&local->iflist_mtx);
3166                 ieee80211_recalc_ps(local, -1);
3167                 mutex_unlock(&local->iflist_mtx);
3168
3169                 ieee80211_recalc_ps_vif(sdata);
3170         }
3171
3172         if (elems.erp_info) {
3173                 erp_valid = true;
3174                 erp_value = elems.erp_info[0];
3175         } else {
3176                 erp_valid = false;
3177         }
3178         changed |= ieee80211_handle_bss_capability(sdata,
3179                         le16_to_cpu(mgmt->u.beacon.capab_info),
3180                         erp_valid, erp_value);
3181
3182         mutex_lock(&local->sta_mtx);
3183         sta = sta_info_get(sdata, bssid);
3184
3185         if (ieee80211_config_bw(sdata, sta,
3186                                 elems.ht_cap_elem, elems.ht_operation,
3187                                 elems.vht_operation, bssid, &changed)) {
3188                 mutex_unlock(&local->sta_mtx);
3189                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3190                                        WLAN_REASON_DEAUTH_LEAVING,
3191                                        true, deauth_buf);
3192                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3193                                       sizeof(deauth_buf));
3194                 return;
3195         }
3196
3197         if (sta && elems.opmode_notif)
3198                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3199                                             rx_status->band, true);
3200         mutex_unlock(&local->sta_mtx);
3201
3202         if (elems.country_elem && elems.pwr_constr_elem &&
3203             mgmt->u.probe_resp.capab_info &
3204                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3205                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
3206                                                        elems.country_elem,
3207                                                        elems.country_elem_len,
3208                                                        elems.pwr_constr_elem);
3209
3210         ieee80211_bss_info_change_notify(sdata, changed);
3211 }
3212
3213 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3214                                   struct sk_buff *skb)
3215 {
3216         struct ieee80211_rx_status *rx_status;
3217         struct ieee80211_mgmt *mgmt;
3218         u16 fc;
3219         struct ieee802_11_elems elems;
3220         int ies_len;
3221
3222         rx_status = (struct ieee80211_rx_status *) skb->cb;
3223         mgmt = (struct ieee80211_mgmt *) skb->data;
3224         fc = le16_to_cpu(mgmt->frame_control);
3225
3226         sdata_lock(sdata);
3227
3228         switch (fc & IEEE80211_FCTL_STYPE) {
3229         case IEEE80211_STYPE_BEACON:
3230                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3231                 break;
3232         case IEEE80211_STYPE_PROBE_RESP:
3233                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3234                 break;
3235         case IEEE80211_STYPE_AUTH:
3236                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3237                 break;
3238         case IEEE80211_STYPE_DEAUTH:
3239                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3240                 break;
3241         case IEEE80211_STYPE_DISASSOC:
3242                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3243                 break;
3244         case IEEE80211_STYPE_ASSOC_RESP:
3245         case IEEE80211_STYPE_REASSOC_RESP:
3246                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3247                 break;
3248         case IEEE80211_STYPE_ACTION:
3249                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3250                         ies_len = skb->len -
3251                                   offsetof(struct ieee80211_mgmt,
3252                                            u.action.u.chan_switch.variable);
3253
3254                         if (ies_len < 0)
3255                                 break;
3256
3257                         ieee802_11_parse_elems(
3258                                 mgmt->u.action.u.chan_switch.variable,
3259                                 ies_len, true, &elems);
3260
3261                         if (elems.parse_error)
3262                                 break;
3263
3264                         ieee80211_sta_process_chanswitch(sdata,
3265                                                          rx_status->mactime,
3266                                                          &elems, false);
3267                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3268                         ies_len = skb->len -
3269                                   offsetof(struct ieee80211_mgmt,
3270                                            u.action.u.ext_chan_switch.variable);
3271
3272                         if (ies_len < 0)
3273                                 break;
3274
3275                         ieee802_11_parse_elems(
3276                                 mgmt->u.action.u.ext_chan_switch.variable,
3277                                 ies_len, true, &elems);
3278
3279                         if (elems.parse_error)
3280                                 break;
3281
3282                         /* for the handling code pretend this was also an IE */
3283                         elems.ext_chansw_ie =
3284                                 &mgmt->u.action.u.ext_chan_switch.data;
3285
3286                         ieee80211_sta_process_chanswitch(sdata,
3287                                                          rx_status->mactime,
3288                                                          &elems, false);
3289                 }
3290                 break;
3291         }
3292         sdata_unlock(sdata);
3293 }
3294
3295 static void ieee80211_sta_timer(unsigned long data)
3296 {
3297         struct ieee80211_sub_if_data *sdata =
3298                 (struct ieee80211_sub_if_data *) data;
3299
3300         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3301 }
3302
3303 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3304                                           u8 *bssid, u8 reason, bool tx)
3305 {
3306         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3307
3308         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3309                                tx, frame_buf);
3310
3311         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3312                               IEEE80211_DEAUTH_FRAME_LEN);
3313 }
3314
3315 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3316 {
3317         struct ieee80211_local *local = sdata->local;
3318         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3319         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3320         u32 tx_flags = 0;
3321
3322         sdata_assert_lock(sdata);
3323
3324         if (WARN_ON_ONCE(!auth_data))
3325                 return -EINVAL;
3326
3327         auth_data->tries++;
3328
3329         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3330                 sdata_info(sdata, "authentication with %pM timed out\n",
3331                            auth_data->bss->bssid);
3332
3333                 /*
3334                  * Most likely AP is not in the range so remove the
3335                  * bss struct for that AP.
3336                  */
3337                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3338
3339                 return -ETIMEDOUT;
3340         }
3341
3342         drv_mgd_prepare_tx(local, sdata);
3343
3344         if (auth_data->bss->proberesp_ies) {
3345                 u16 trans = 1;
3346                 u16 status = 0;
3347
3348                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3349                            auth_data->bss->bssid, auth_data->tries,
3350                            IEEE80211_AUTH_MAX_TRIES);
3351
3352                 auth_data->expected_transaction = 2;
3353
3354                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3355                         trans = auth_data->sae_trans;
3356                         status = auth_data->sae_status;
3357                         auth_data->expected_transaction = trans;
3358                 }
3359
3360                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3361                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3362                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3363
3364                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3365                                     auth_data->data, auth_data->data_len,
3366                                     auth_data->bss->bssid,
3367                                     auth_data->bss->bssid, NULL, 0, 0,
3368                                     tx_flags);
3369         } else {
3370                 const u8 *ssidie;
3371
3372                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3373                            auth_data->bss->bssid, auth_data->tries,
3374                            IEEE80211_AUTH_MAX_TRIES);
3375
3376                 rcu_read_lock();
3377                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3378                 if (!ssidie) {
3379                         rcu_read_unlock();
3380                         return -EINVAL;
3381                 }
3382                 /*
3383                  * Direct probe is sent to broadcast address as some APs
3384                  * will not answer to direct packet in unassociated state.
3385                  */
3386                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3387                                          NULL, 0, (u32) -1, true, 0,
3388                                          auth_data->bss->channel, false);
3389                 rcu_read_unlock();
3390         }
3391
3392         if (tx_flags == 0) {
3393                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3394                 auth_data->timeout_started = true;
3395                 run_again(sdata, auth_data->timeout);
3396         } else {
3397                 auth_data->timeout =
3398                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3399                 auth_data->timeout_started = true;
3400                 run_again(sdata, auth_data->timeout);
3401         }
3402
3403         return 0;
3404 }
3405
3406 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3407 {
3408         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3409         struct ieee80211_local *local = sdata->local;
3410
3411         sdata_assert_lock(sdata);
3412
3413         assoc_data->tries++;
3414         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3415                 sdata_info(sdata, "association with %pM timed out\n",
3416                            assoc_data->bss->bssid);
3417
3418                 /*
3419                  * Most likely AP is not in the range so remove the
3420                  * bss struct for that AP.
3421                  */
3422                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3423
3424                 return -ETIMEDOUT;
3425         }
3426
3427         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3428                    assoc_data->bss->bssid, assoc_data->tries,
3429                    IEEE80211_ASSOC_MAX_TRIES);
3430         ieee80211_send_assoc(sdata);
3431
3432         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3433                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3434                 assoc_data->timeout_started = true;
3435                 run_again(sdata, assoc_data->timeout);
3436         } else {
3437                 assoc_data->timeout =
3438                         round_jiffies_up(jiffies +
3439                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3440                 assoc_data->timeout_started = true;
3441                 run_again(sdata, assoc_data->timeout);
3442         }
3443
3444         return 0;
3445 }
3446
3447 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3448                                   __le16 fc, bool acked)
3449 {
3450         struct ieee80211_local *local = sdata->local;
3451
3452         sdata->u.mgd.status_fc = fc;
3453         sdata->u.mgd.status_acked = acked;
3454         sdata->u.mgd.status_received = true;
3455
3456         ieee80211_queue_work(&local->hw, &sdata->work);
3457 }
3458
3459 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3460 {
3461         struct ieee80211_local *local = sdata->local;
3462         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3463
3464         sdata_lock(sdata);
3465
3466         if (ifmgd->status_received) {
3467                 __le16 fc = ifmgd->status_fc;
3468                 bool status_acked = ifmgd->status_acked;
3469
3470                 ifmgd->status_received = false;
3471                 if (ifmgd->auth_data &&
3472                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3473                         if (status_acked) {
3474                                 ifmgd->auth_data->timeout =
3475                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3476                                 run_again(sdata, ifmgd->auth_data->timeout);
3477                         } else {
3478                                 ifmgd->auth_data->timeout = jiffies - 1;
3479                         }
3480                         ifmgd->auth_data->timeout_started = true;
3481                 } else if (ifmgd->assoc_data &&
3482                            (ieee80211_is_assoc_req(fc) ||
3483                             ieee80211_is_reassoc_req(fc))) {
3484                         if (status_acked) {
3485                                 ifmgd->assoc_data->timeout =
3486                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3487                                 run_again(sdata, ifmgd->assoc_data->timeout);
3488                         } else {
3489                                 ifmgd->assoc_data->timeout = jiffies - 1;
3490                         }
3491                         ifmgd->assoc_data->timeout_started = true;
3492                 }
3493         }
3494
3495         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3496             time_after(jiffies, ifmgd->auth_data->timeout)) {
3497                 if (ifmgd->auth_data->done) {
3498                         /*
3499                          * ok ... we waited for assoc but userspace didn't,
3500                          * so let's just kill the auth data
3501                          */
3502                         ieee80211_destroy_auth_data(sdata, false);
3503                 } else if (ieee80211_probe_auth(sdata)) {
3504                         u8 bssid[ETH_ALEN];
3505
3506                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3507
3508                         ieee80211_destroy_auth_data(sdata, false);
3509
3510                         cfg80211_auth_timeout(sdata->dev, bssid);
3511                 }
3512         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3513                 run_again(sdata, ifmgd->auth_data->timeout);
3514
3515         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3516             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3517                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3518                     ieee80211_do_assoc(sdata)) {
3519                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3520
3521                         ieee80211_destroy_assoc_data(sdata, false);
3522                         cfg80211_assoc_timeout(sdata->dev, bss);
3523                 }
3524         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3525                 run_again(sdata, ifmgd->assoc_data->timeout);
3526
3527         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3528             ifmgd->associated) {
3529                 u8 bssid[ETH_ALEN];
3530                 int max_tries;
3531
3532                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3533
3534                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3535                         max_tries = max_nullfunc_tries;
3536                 else
3537                         max_tries = max_probe_tries;
3538
3539                 /* ACK received for nullfunc probing frame */
3540                 if (!ifmgd->probe_send_count)
3541                         ieee80211_reset_ap_probe(sdata);
3542                 else if (ifmgd->nullfunc_failed) {
3543                         if (ifmgd->probe_send_count < max_tries) {
3544                                 mlme_dbg(sdata,
3545                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3546                                          bssid, ifmgd->probe_send_count,
3547                                          max_tries);
3548                                 ieee80211_mgd_probe_ap_send(sdata);
3549                         } else {
3550                                 mlme_dbg(sdata,
3551                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3552                                          bssid);
3553                                 ieee80211_sta_connection_lost(sdata, bssid,
3554                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3555                                         false);
3556                         }
3557                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3558                         run_again(sdata, ifmgd->probe_timeout);
3559                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3560                         mlme_dbg(sdata,
3561                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3562                                  bssid, probe_wait_ms);
3563                         ieee80211_sta_connection_lost(sdata, bssid,
3564                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3565                 } else if (ifmgd->probe_send_count < max_tries) {
3566                         mlme_dbg(sdata,
3567                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3568                                  bssid, probe_wait_ms,
3569                                  ifmgd->probe_send_count, max_tries);
3570                         ieee80211_mgd_probe_ap_send(sdata);
3571                 } else {
3572                         /*
3573                          * We actually lost the connection ... or did we?
3574                          * Let's make sure!
3575                          */
3576                         wiphy_debug(local->hw.wiphy,
3577                                     "%s: No probe response from AP %pM"
3578                                     " after %dms, disconnecting.\n",
3579                                     sdata->name,
3580                                     bssid, probe_wait_ms);
3581
3582                         ieee80211_sta_connection_lost(sdata, bssid,
3583                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3584                 }
3585         }
3586
3587         sdata_unlock(sdata);
3588 }
3589
3590 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3591 {
3592         struct ieee80211_sub_if_data *sdata =
3593                 (struct ieee80211_sub_if_data *) data;
3594         struct ieee80211_local *local = sdata->local;
3595
3596         if (local->quiescing)
3597                 return;
3598
3599         if (sdata->vif.csa_active)
3600                 return;
3601
3602         sdata->u.mgd.connection_loss = false;
3603         ieee80211_queue_work(&sdata->local->hw,
3604                              &sdata->u.mgd.beacon_connection_loss_work);
3605 }
3606
3607 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3608 {
3609         struct ieee80211_sub_if_data *sdata =
3610                 (struct ieee80211_sub_if_data *) data;
3611         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3612         struct ieee80211_local *local = sdata->local;
3613
3614         if (local->quiescing)
3615                 return;
3616
3617         if (sdata->vif.csa_active)
3618                 return;
3619
3620         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3621 }
3622
3623 static void ieee80211_sta_monitor_work(struct work_struct *work)
3624 {
3625         struct ieee80211_sub_if_data *sdata =
3626                 container_of(work, struct ieee80211_sub_if_data,
3627                              u.mgd.monitor_work);
3628
3629         ieee80211_mgd_probe_ap(sdata, false);
3630 }
3631
3632 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3633 {
3634         u32 flags;
3635
3636         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3637                 __ieee80211_stop_poll(sdata);
3638
3639                 /* let's probe the connection once */
3640                 flags = sdata->local->hw.flags;
3641                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3642                         ieee80211_queue_work(&sdata->local->hw,
3643                                              &sdata->u.mgd.monitor_work);
3644                 /* and do all the other regular work too */
3645                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3646         }
3647 }
3648
3649 #ifdef CONFIG_PM
3650 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3651 {
3652         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3653         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3654
3655         sdata_lock(sdata);
3656
3657         if (ifmgd->auth_data || ifmgd->assoc_data) {
3658                 const u8 *bssid = ifmgd->auth_data ?
3659                                 ifmgd->auth_data->bss->bssid :
3660                                 ifmgd->assoc_data->bss->bssid;
3661
3662                 /*
3663                  * If we are trying to authenticate / associate while suspending,
3664                  * cfg80211 won't know and won't actually abort those attempts,
3665                  * thus we need to do that ourselves.
3666                  */
3667                 ieee80211_send_deauth_disassoc(sdata, bssid,
3668                                                IEEE80211_STYPE_DEAUTH,
3669                                                WLAN_REASON_DEAUTH_LEAVING,
3670                                                false, frame_buf);
3671                 if (ifmgd->assoc_data)
3672                         ieee80211_destroy_assoc_data(sdata, false);
3673                 if (ifmgd->auth_data)
3674                         ieee80211_destroy_auth_data(sdata, false);
3675                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3676                                       IEEE80211_DEAUTH_FRAME_LEN);
3677         }
3678
3679         sdata_unlock(sdata);
3680 }
3681
3682 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3683 {
3684         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3685
3686         sdata_lock(sdata);
3687         if (!ifmgd->associated) {
3688                 sdata_unlock(sdata);
3689                 return;
3690         }
3691
3692         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3693                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3694                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3695                 ieee80211_sta_connection_lost(sdata,
3696                                               ifmgd->associated->bssid,
3697                                               WLAN_REASON_UNSPECIFIED,
3698                                               true);
3699                 sdata_unlock(sdata);
3700                 return;
3701         }
3702         sdata_unlock(sdata);
3703 }
3704 #endif
3705
3706 /* interface setup */
3707 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3708 {
3709         struct ieee80211_if_managed *ifmgd;
3710
3711         ifmgd = &sdata->u.mgd;
3712         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3713         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3714         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3715                   ieee80211_beacon_connection_loss_work);
3716         INIT_WORK(&ifmgd->csa_connection_drop_work,
3717                   ieee80211_csa_connection_drop_work);
3718         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3719         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
3720                           ieee80211_tdls_peer_del_work);
3721         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3722                     (unsigned long) sdata);
3723         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3724                     (unsigned long) sdata);
3725         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3726                     (unsigned long) sdata);
3727         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3728                     (unsigned long) sdata);
3729
3730         ifmgd->flags = 0;
3731         ifmgd->powersave = sdata->wdev.ps;
3732         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3733         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3734         ifmgd->p2p_noa_index = -1;
3735
3736         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3737                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3738         else
3739                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3740 }
3741
3742 /* scan finished notification */
3743 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3744 {
3745         struct ieee80211_sub_if_data *sdata;
3746
3747         /* Restart STA timers */
3748         rcu_read_lock();
3749         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3750                 if (ieee80211_sdata_running(sdata))
3751                         ieee80211_restart_sta_timer(sdata);
3752         }
3753         rcu_read_unlock();
3754 }
3755
3756 int ieee80211_max_network_latency(struct notifier_block *nb,
3757                                   unsigned long data, void *dummy)
3758 {
3759         s32 latency_usec = (s32) data;
3760         struct ieee80211_local *local =
3761                 container_of(nb, struct ieee80211_local,
3762                              network_latency_notifier);
3763
3764         mutex_lock(&local->iflist_mtx);
3765         ieee80211_recalc_ps(local, latency_usec);
3766         mutex_unlock(&local->iflist_mtx);
3767
3768         return NOTIFY_OK;
3769 }
3770
3771 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3772                                      struct cfg80211_bss *cbss)
3773 {
3774         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3775         const u8 *ht_cap_ie, *vht_cap_ie;
3776         const struct ieee80211_ht_cap *ht_cap;
3777         const struct ieee80211_vht_cap *vht_cap;
3778         u8 chains = 1;
3779
3780         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3781                 return chains;
3782
3783         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3784         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3785                 ht_cap = (void *)(ht_cap_ie + 2);
3786                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3787                 /*
3788                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3789                  *       "Tx Unequal Modulation Supported" fields.
3790                  */
3791         }
3792
3793         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3794                 return chains;
3795
3796         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3797         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3798                 u8 nss;
3799                 u16 tx_mcs_map;
3800
3801                 vht_cap = (void *)(vht_cap_ie + 2);
3802                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3803                 for (nss = 8; nss > 0; nss--) {
3804                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3805                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3806                                 break;
3807                 }
3808                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3809                 chains = max(chains, nss);
3810         }
3811
3812         return chains;
3813 }
3814
3815 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3816                                   struct cfg80211_bss *cbss)
3817 {
3818         struct ieee80211_local *local = sdata->local;
3819         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3820         const struct ieee80211_ht_cap *ht_cap = NULL;
3821         const struct ieee80211_ht_operation *ht_oper = NULL;
3822         const struct ieee80211_vht_operation *vht_oper = NULL;
3823         struct ieee80211_supported_band *sband;
3824         struct cfg80211_chan_def chandef;
3825         int ret;
3826
3827         sband = local->hw.wiphy->bands[cbss->channel->band];
3828
3829         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3830                           IEEE80211_STA_DISABLE_80P80MHZ |
3831                           IEEE80211_STA_DISABLE_160MHZ);
3832
3833         rcu_read_lock();
3834
3835         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3836             sband->ht_cap.ht_supported) {
3837                 const u8 *ht_oper_ie, *ht_cap_ie;
3838
3839                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3840                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3841                         ht_oper = (void *)(ht_oper_ie + 2);
3842
3843                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3844                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
3845                         ht_cap = (void *)(ht_cap_ie + 2);
3846
3847                 if (!ht_cap) {
3848                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3849                         ht_oper = NULL;
3850                 }
3851         }
3852
3853         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3854             sband->vht_cap.vht_supported) {
3855                 const u8 *vht_oper_ie, *vht_cap;
3856
3857                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3858                                                    WLAN_EID_VHT_OPERATION);
3859                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3860                         vht_oper = (void *)(vht_oper_ie + 2);
3861                 if (vht_oper && !ht_oper) {
3862                         vht_oper = NULL;
3863                         sdata_info(sdata,
3864                                    "AP advertised VHT without HT, disabling both\n");
3865                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3866                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3867                 }
3868
3869                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3870                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3871                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3872                         vht_oper = NULL;
3873                 }
3874         }
3875
3876         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3877                                                      cbss->channel,
3878                                                      ht_cap, ht_oper, vht_oper,
3879                                                      &chandef, false);
3880
3881         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3882                                       local->rx_chains);
3883
3884         rcu_read_unlock();
3885
3886         /* will change later if needed */
3887         sdata->smps_mode = IEEE80211_SMPS_OFF;
3888
3889         mutex_lock(&local->mtx);
3890         /*
3891          * If this fails (possibly due to channel context sharing
3892          * on incompatible channels, e.g. 80+80 and 160 sharing the
3893          * same control channel) try to use a smaller bandwidth.
3894          */
3895         ret = ieee80211_vif_use_channel(sdata, &chandef,
3896                                         IEEE80211_CHANCTX_SHARED);
3897
3898         /* don't downgrade for 5 and 10 MHz channels, though. */
3899         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3900             chandef.width == NL80211_CHAN_WIDTH_10)
3901                 goto out;
3902
3903         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3904                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3905                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3906                                                 IEEE80211_CHANCTX_SHARED);
3907         }
3908  out:
3909         mutex_unlock(&local->mtx);
3910         return ret;
3911 }
3912
3913 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3914                                      struct cfg80211_bss *cbss, bool assoc)
3915 {
3916         struct ieee80211_local *local = sdata->local;
3917         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3918         struct ieee80211_bss *bss = (void *)cbss->priv;
3919         struct sta_info *new_sta = NULL;
3920         bool have_sta = false;
3921         int err;
3922
3923         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3924                 return -EINVAL;
3925
3926         if (assoc) {
3927                 rcu_read_lock();
3928                 have_sta = sta_info_get(sdata, cbss->bssid);
3929                 rcu_read_unlock();
3930         }
3931
3932         if (!have_sta) {
3933                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3934                 if (!new_sta)
3935                         return -ENOMEM;
3936         }
3937         if (new_sta) {
3938                 u32 rates = 0, basic_rates = 0;
3939                 bool have_higher_than_11mbit;
3940                 int min_rate = INT_MAX, min_rate_index = -1;
3941                 struct ieee80211_chanctx_conf *chanctx_conf;
3942                 struct ieee80211_supported_band *sband;
3943                 const struct cfg80211_bss_ies *ies;
3944                 int shift;
3945                 u32 rate_flags;
3946
3947                 sband = local->hw.wiphy->bands[cbss->channel->band];
3948
3949                 err = ieee80211_prep_channel(sdata, cbss);
3950                 if (err) {
3951                         sta_info_free(local, new_sta);
3952                         return -EINVAL;
3953                 }
3954                 shift = ieee80211_vif_get_shift(&sdata->vif);
3955
3956                 rcu_read_lock();
3957                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3958                 if (WARN_ON(!chanctx_conf)) {
3959                         rcu_read_unlock();
3960                         sta_info_free(local, new_sta);
3961                         return -EINVAL;
3962                 }
3963                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
3964                 rcu_read_unlock();
3965
3966                 ieee80211_get_rates(sband, bss->supp_rates,
3967                                     bss->supp_rates_len,
3968                                     &rates, &basic_rates,
3969                                     &have_higher_than_11mbit,
3970                                     &min_rate, &min_rate_index,
3971                                     shift, rate_flags);
3972
3973                 /*
3974                  * This used to be a workaround for basic rates missing
3975                  * in the association response frame. Now that we no
3976                  * longer use the basic rates from there, it probably
3977                  * doesn't happen any more, but keep the workaround so
3978                  * in case some *other* APs are buggy in different ways
3979                  * we can connect -- with a warning.
3980                  */
3981                 if (!basic_rates && min_rate_index >= 0) {
3982                         sdata_info(sdata,
3983                                    "No basic rates, using min rate instead\n");
3984                         basic_rates = BIT(min_rate_index);
3985                 }
3986
3987                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3988                 sdata->vif.bss_conf.basic_rates = basic_rates;
3989
3990                 /* cf. IEEE 802.11 9.2.12 */
3991                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3992                     have_higher_than_11mbit)
3993                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3994                 else
3995                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3996
3997                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3998
3999                 /* set timing information */
4000                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4001                 rcu_read_lock();
4002                 ies = rcu_dereference(cbss->beacon_ies);
4003                 if (ies) {
4004                         const u8 *tim_ie;
4005
4006                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4007                         sdata->vif.bss_conf.sync_device_ts =
4008                                 bss->device_ts_beacon;
4009                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4010                                                   ies->data, ies->len);
4011                         if (tim_ie && tim_ie[1] >= 2)
4012                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4013                         else
4014                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4015                 } else if (!(local->hw.flags &
4016                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4017                         ies = rcu_dereference(cbss->proberesp_ies);
4018                         /* must be non-NULL since beacon IEs were NULL */
4019                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4020                         sdata->vif.bss_conf.sync_device_ts =
4021                                 bss->device_ts_presp;
4022                         sdata->vif.bss_conf.sync_dtim_count = 0;
4023                 } else {
4024                         sdata->vif.bss_conf.sync_tsf = 0;
4025                         sdata->vif.bss_conf.sync_device_ts = 0;
4026                         sdata->vif.bss_conf.sync_dtim_count = 0;
4027                 }
4028                 rcu_read_unlock();
4029
4030                 /* tell driver about BSSID, basic rates and timing */
4031                 ieee80211_bss_info_change_notify(sdata,
4032                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4033                         BSS_CHANGED_BEACON_INT);
4034
4035                 if (assoc)
4036                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4037
4038                 err = sta_info_insert(new_sta);
4039                 new_sta = NULL;
4040                 if (err) {
4041                         sdata_info(sdata,
4042                                    "failed to insert STA entry for the AP (error %d)\n",
4043                                    err);
4044                         return err;
4045                 }
4046         } else
4047                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4048
4049         return 0;
4050 }
4051
4052 /* config hooks */
4053 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4054                        struct cfg80211_auth_request *req)
4055 {
4056         struct ieee80211_local *local = sdata->local;
4057         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4058         struct ieee80211_mgd_auth_data *auth_data;
4059         u16 auth_alg;
4060         int err;
4061
4062         /* prepare auth data structure */
4063
4064         switch (req->auth_type) {
4065         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4066                 auth_alg = WLAN_AUTH_OPEN;
4067                 break;
4068         case NL80211_AUTHTYPE_SHARED_KEY:
4069                 if (IS_ERR(local->wep_tx_tfm))
4070                         return -EOPNOTSUPP;
4071                 auth_alg = WLAN_AUTH_SHARED_KEY;
4072                 break;
4073         case NL80211_AUTHTYPE_FT:
4074                 auth_alg = WLAN_AUTH_FT;
4075                 break;
4076         case NL80211_AUTHTYPE_NETWORK_EAP:
4077                 auth_alg = WLAN_AUTH_LEAP;
4078                 break;
4079         case NL80211_AUTHTYPE_SAE:
4080                 auth_alg = WLAN_AUTH_SAE;
4081                 break;
4082         default:
4083                 return -EOPNOTSUPP;
4084         }
4085
4086         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4087                             req->ie_len, GFP_KERNEL);
4088         if (!auth_data)
4089                 return -ENOMEM;
4090
4091         auth_data->bss = req->bss;
4092
4093         if (req->sae_data_len >= 4) {
4094                 __le16 *pos = (__le16 *) req->sae_data;
4095                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4096                 auth_data->sae_status = le16_to_cpu(pos[1]);
4097                 memcpy(auth_data->data, req->sae_data + 4,
4098                        req->sae_data_len - 4);
4099                 auth_data->data_len += req->sae_data_len - 4;
4100         }
4101
4102         if (req->ie && req->ie_len) {
4103                 memcpy(&auth_data->data[auth_data->data_len],
4104                        req->ie, req->ie_len);
4105                 auth_data->data_len += req->ie_len;
4106         }
4107
4108         if (req->key && req->key_len) {
4109                 auth_data->key_len = req->key_len;
4110                 auth_data->key_idx = req->key_idx;
4111                 memcpy(auth_data->key, req->key, req->key_len);
4112         }
4113
4114         auth_data->algorithm = auth_alg;
4115
4116         /* try to authenticate/probe */
4117
4118         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4119             ifmgd->assoc_data) {
4120                 err = -EBUSY;
4121                 goto err_free;
4122         }
4123
4124         if (ifmgd->auth_data)
4125                 ieee80211_destroy_auth_data(sdata, false);
4126
4127         /* prep auth_data so we don't go into idle on disassoc */
4128         ifmgd->auth_data = auth_data;
4129
4130         if (ifmgd->associated) {
4131                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4132
4133                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4134                                        WLAN_REASON_UNSPECIFIED,
4135                                        false, frame_buf);
4136
4137                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4138                                       sizeof(frame_buf));
4139         }
4140
4141         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4142
4143         err = ieee80211_prep_connection(sdata, req->bss, false);
4144         if (err)
4145                 goto err_clear;
4146
4147         err = ieee80211_probe_auth(sdata);
4148         if (err) {
4149                 sta_info_destroy_addr(sdata, req->bss->bssid);
4150                 goto err_clear;
4151         }
4152
4153         /* hold our own reference */
4154         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4155         return 0;
4156
4157  err_clear:
4158         memset(ifmgd->bssid, 0, ETH_ALEN);
4159         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4160         ifmgd->auth_data = NULL;
4161  err_free:
4162         kfree(auth_data);
4163         return err;
4164 }
4165
4166 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4167                                         const u8 *wmm_param, int len)
4168 {
4169         const u8 *pos;
4170         size_t left;
4171
4172         if (len < 8)
4173                 return false;
4174
4175         if (wmm_param[5] != 1 /* version */)
4176                 return false;
4177
4178         pos = wmm_param + 8;
4179         left = len - 8;
4180
4181         for (; left >= 4; left -= 4, pos += 4) {
4182                 u8 aifsn = pos[0] & 0x0f;
4183                 u8 ecwmin = pos[1] & 0x0f;
4184                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4185                 int aci = (pos[0] >> 5) & 0x03;
4186
4187                 if (aifsn < 2) {
4188                         sdata_info(sdata,
4189                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4190                                    aifsn, aci);
4191                         return false;
4192                 }
4193                 if (ecwmin > ecwmax) {
4194                         sdata_info(sdata,
4195                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4196                                    ecwmin, ecwmax, aci);
4197                         return false;
4198                 }
4199         }
4200
4201         return true;
4202 }
4203
4204 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4205                         struct cfg80211_assoc_request *req)
4206 {
4207         struct ieee80211_local *local = sdata->local;
4208         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4209         struct ieee80211_bss *bss = (void *)req->bss->priv;
4210         struct ieee80211_mgd_assoc_data *assoc_data;
4211         const struct cfg80211_bss_ies *beacon_ies;
4212         struct ieee80211_supported_band *sband;
4213         const u8 *ssidie, *ht_ie, *vht_ie;
4214         int i, err;
4215
4216         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4217         if (!assoc_data)
4218                 return -ENOMEM;
4219
4220         rcu_read_lock();
4221         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4222         if (!ssidie) {
4223                 rcu_read_unlock();
4224                 kfree(assoc_data);
4225                 return -EINVAL;
4226         }
4227         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4228         assoc_data->ssid_len = ssidie[1];
4229         rcu_read_unlock();
4230
4231         if (ifmgd->associated) {
4232                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4233
4234                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4235                                        WLAN_REASON_UNSPECIFIED,
4236                                        false, frame_buf);
4237
4238                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4239                                       sizeof(frame_buf));
4240         }
4241
4242         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4243                 err = -EBUSY;
4244                 goto err_free;
4245         }
4246
4247         if (ifmgd->assoc_data) {
4248                 err = -EBUSY;
4249                 goto err_free;
4250         }
4251
4252         if (ifmgd->auth_data) {
4253                 bool match;
4254
4255                 /* keep sta info, bssid if matching */
4256                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4257                 ieee80211_destroy_auth_data(sdata, match);
4258         }
4259
4260         /* prepare assoc data */
4261
4262         ifmgd->beacon_crc_valid = false;
4263
4264         assoc_data->wmm = bss->wmm_used &&
4265                           (local->hw.queues >= IEEE80211_NUM_ACS);
4266         if (assoc_data->wmm) {
4267                 /* try to check validity of WMM params IE */
4268                 const struct cfg80211_bss_ies *ies;
4269                 const u8 *wp, *start, *end;
4270
4271                 rcu_read_lock();
4272                 ies = rcu_dereference(req->bss->ies);
4273                 start = ies->data;
4274                 end = start + ies->len;
4275
4276                 while (true) {
4277                         wp = cfg80211_find_vendor_ie(
4278                                 WLAN_OUI_MICROSOFT,
4279                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4280                                 start, end - start);
4281                         if (!wp)
4282                                 break;
4283                         start = wp + wp[1] + 2;
4284                         /* if this IE is too short, try the next */
4285                         if (wp[1] <= 4)
4286                                 continue;
4287                         /* if this IE is WMM params, we found what we wanted */
4288                         if (wp[6] == 1)
4289                                 break;
4290                 }
4291
4292                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4293                                                         wp[1] - 2)) {
4294                         assoc_data->wmm = false;
4295                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4296                 }
4297                 rcu_read_unlock();
4298         }
4299
4300         /*
4301          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4302          * We still associate in non-HT mode (11a/b/g) if any one of these
4303          * ciphers is configured as pairwise.
4304          * We can set this to true for non-11n hardware, that'll be checked
4305          * separately along with the peer capabilities.
4306          */
4307         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4308                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4309                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4310                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4311                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4312                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4313                         netdev_info(sdata->dev,
4314                                     "disabling HT/VHT due to WEP/TKIP use\n");
4315                 }
4316         }
4317
4318         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4319                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4320                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4321         }
4322
4323         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4324                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4325
4326         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4327         sband = local->hw.wiphy->bands[req->bss->channel->band];
4328         if (!sband->ht_cap.ht_supported ||
4329             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4330             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4331                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4332                 if (!bss->wmm_used &&
4333                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4334                         netdev_info(sdata->dev,
4335                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4336         }
4337
4338         /* disable VHT if we don't support it or the AP doesn't use WMM */
4339         if (!sband->vht_cap.vht_supported ||
4340             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4341             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4342                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4343                 if (!bss->wmm_used &&
4344                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4345                         netdev_info(sdata->dev,
4346                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4347         }
4348
4349         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4350         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4351                sizeof(ifmgd->ht_capa_mask));
4352
4353         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4354         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4355                sizeof(ifmgd->vht_capa_mask));
4356
4357         if (req->ie && req->ie_len) {
4358                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4359                 assoc_data->ie_len = req->ie_len;
4360         }
4361
4362         assoc_data->bss = req->bss;
4363
4364         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4365                 if (ifmgd->powersave)
4366                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4367                 else
4368                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4369         } else
4370                 sdata->smps_mode = ifmgd->req_smps;
4371
4372         assoc_data->capability = req->bss->capability;
4373         assoc_data->supp_rates = bss->supp_rates;
4374         assoc_data->supp_rates_len = bss->supp_rates_len;
4375
4376         rcu_read_lock();
4377         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4378         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4379                 assoc_data->ap_ht_param =
4380                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4381         else
4382                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4383         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4384         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4385                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4386                        sizeof(struct ieee80211_vht_cap));
4387         else
4388                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4389         rcu_read_unlock();
4390
4391         if (bss->wmm_used && bss->uapsd_supported &&
4392             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4393                 assoc_data->uapsd = true;
4394                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4395         } else {
4396                 assoc_data->uapsd = false;
4397                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4398         }
4399
4400         if (req->prev_bssid)
4401                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4402
4403         if (req->use_mfp) {
4404                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4405                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4406         } else {
4407                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4408                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4409         }
4410
4411         if (req->crypto.control_port)
4412                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4413         else
4414                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4415
4416         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4417         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4418         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4419                                                         sdata->vif.type);
4420
4421         /* kick off associate process */
4422
4423         ifmgd->assoc_data = assoc_data;
4424         ifmgd->dtim_period = 0;
4425         ifmgd->have_beacon = false;
4426
4427         err = ieee80211_prep_connection(sdata, req->bss, true);
4428         if (err)
4429                 goto err_clear;
4430
4431         rcu_read_lock();
4432         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4433
4434         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4435             !beacon_ies) {
4436                 /*
4437                  * Wait up to one beacon interval ...
4438                  * should this be more if we miss one?
4439                  */
4440                 sdata_info(sdata, "waiting for beacon from %pM\n",
4441                            ifmgd->bssid);
4442                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4443                 assoc_data->timeout_started = true;
4444                 assoc_data->need_beacon = true;
4445         } else if (beacon_ies) {
4446                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4447                                                     beacon_ies->data,
4448                                                     beacon_ies->len);
4449                 u8 dtim_count = 0;
4450
4451                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4452                         const struct ieee80211_tim_ie *tim;
4453                         tim = (void *)(tim_ie + 2);
4454                         ifmgd->dtim_period = tim->dtim_period;
4455                         dtim_count = tim->dtim_count;
4456                 }
4457                 ifmgd->have_beacon = true;
4458                 assoc_data->timeout = jiffies;
4459                 assoc_data->timeout_started = true;
4460
4461                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4462                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4463                         sdata->vif.bss_conf.sync_device_ts =
4464                                 bss->device_ts_beacon;
4465                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4466                 }
4467         } else {
4468                 assoc_data->timeout = jiffies;
4469                 assoc_data->timeout_started = true;
4470         }
4471         rcu_read_unlock();
4472
4473         run_again(sdata, assoc_data->timeout);
4474
4475         if (bss->corrupt_data) {
4476                 char *corrupt_type = "data";
4477                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4478                         if (bss->corrupt_data &
4479                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4480                                 corrupt_type = "beacon and probe response";
4481                         else
4482                                 corrupt_type = "beacon";
4483                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4484                         corrupt_type = "probe response";
4485                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4486                            corrupt_type);
4487         }
4488
4489         return 0;
4490  err_clear:
4491         memset(ifmgd->bssid, 0, ETH_ALEN);
4492         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4493         ifmgd->assoc_data = NULL;
4494  err_free:
4495         kfree(assoc_data);
4496         return err;
4497 }
4498
4499 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4500                          struct cfg80211_deauth_request *req)
4501 {
4502         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4503         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4504         bool tx = !req->local_state_change;
4505
4506         if (ifmgd->auth_data &&
4507             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4508                 sdata_info(sdata,
4509                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4510                            req->bssid, req->reason_code,
4511                            ieee80211_get_reason_code_string(req->reason_code));
4512
4513                 drv_mgd_prepare_tx(sdata->local, sdata);
4514                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4515                                                IEEE80211_STYPE_DEAUTH,
4516                                                req->reason_code, tx,
4517                                                frame_buf);
4518                 ieee80211_destroy_auth_data(sdata, false);
4519                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4520                                       IEEE80211_DEAUTH_FRAME_LEN);
4521
4522                 return 0;
4523         }
4524
4525         if (ifmgd->associated &&
4526             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4527                 sdata_info(sdata,
4528                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4529                            req->bssid, req->reason_code,
4530                            ieee80211_get_reason_code_string(req->reason_code));
4531
4532                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4533                                        req->reason_code, tx, frame_buf);
4534                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4535                                       IEEE80211_DEAUTH_FRAME_LEN);
4536                 return 0;
4537         }
4538
4539         return -ENOTCONN;
4540 }
4541
4542 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4543                            struct cfg80211_disassoc_request *req)
4544 {
4545         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4546         u8 bssid[ETH_ALEN];
4547         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4548
4549         /*
4550          * cfg80211 should catch this ... but it's racy since
4551          * we can receive a disassoc frame, process it, hand it
4552          * to cfg80211 while that's in a locked section already
4553          * trying to tell us that the user wants to disconnect.
4554          */
4555         if (ifmgd->associated != req->bss)
4556                 return -ENOLINK;
4557
4558         sdata_info(sdata,
4559                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4560                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4561
4562         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4563         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4564                                req->reason_code, !req->local_state_change,
4565                                frame_buf);
4566
4567         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4568                               IEEE80211_DEAUTH_FRAME_LEN);
4569
4570         return 0;
4571 }
4572
4573 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4574 {
4575         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4576
4577         /*
4578          * Make sure some work items will not run after this,
4579          * they will not do anything but might not have been
4580          * cancelled when disconnecting.
4581          */
4582         cancel_work_sync(&ifmgd->monitor_work);
4583         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4584         cancel_work_sync(&ifmgd->request_smps_work);
4585         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4586         cancel_work_sync(&ifmgd->chswitch_work);
4587         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4588
4589         sdata_lock(sdata);
4590         if (ifmgd->assoc_data) {
4591                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4592                 ieee80211_destroy_assoc_data(sdata, false);
4593                 cfg80211_assoc_timeout(sdata->dev, bss);
4594         }
4595         if (ifmgd->auth_data)
4596                 ieee80211_destroy_auth_data(sdata, false);
4597         del_timer_sync(&ifmgd->timer);
4598         sdata_unlock(sdata);
4599 }
4600
4601 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4602                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4603                                gfp_t gfp)
4604 {
4605         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4606
4607         trace_api_cqm_rssi_notify(sdata, rssi_event);
4608
4609         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4610 }
4611 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);