net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/pm_qos.h>
  23 #include <linux/crc32.h>
  24 #include <linux/slab.h>
  25 #include <linux/export.h>
  26 #include <net/mac80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "led.h"
  33
  34 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  35 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  36 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  37 #define IEEE80211_AUTH_MAX_TRIES        3
  38 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  39 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  40 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  41 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  42 #define IEEE80211_ASSOC_MAX_TRIES       3
  43
  44 static int max_nullfunc_tries = 2;
  45 module_param(max_nullfunc_tries, int, 0644);
  46 MODULE_PARM_DESC(max_nullfunc_tries,
  47                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  48
  49 static int max_probe_tries = 5;
  50 module_param(max_probe_tries, int, 0644);
  51 MODULE_PARM_DESC(max_probe_tries,
  52                  "Maximum probe tries before disconnecting (reason 4).");
  53
  54 /*
  55  * Beacon loss timeout is calculated as N frames times the
  56  * advertised beacon interval.  This may need to be somewhat
  57  * higher than what hardware might detect to account for
  58  * delays in the host processing frames. But since we also
  59  * probe on beacon miss before declaring the connection lost
  60  * default to what we want.
  61  */
  62 static int beacon_loss_count = 7;
  63 module_param(beacon_loss_count, int, 0644);
  64 MODULE_PARM_DESC(beacon_loss_count,
  65                  "Number of beacon intervals before we decide beacon was lost.");
  66
  67 /*
  68  * Time the connection can be idle before we probe
  69  * it to see if we can still talk to the AP.
  70  */
  71 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  72 /*
  73  * Time we wait for a probe response after sending
  74  * a probe request because of beacon loss or for
  75  * checking the connection still works.
  76  */
  77 static int probe_wait_ms = 500;
  78 module_param(probe_wait_ms, int, 0644);
  79 MODULE_PARM_DESC(probe_wait_ms,
  80                  "Maximum time(ms) to wait for probe response"
  81                  " before disconnecting (reason 4).");
  82
  83 /*
  84  * Weight given to the latest Beacon frame when calculating average signal
  85  * strength for Beacon frames received in the current BSS. This must be
  86  * between 1 and 15.
  87  */
  88 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  89
  90 /*
  91  * How many Beacon frames need to have been used in average signal strength
  92  * before starting to indicate signal change events.
  93  */
  94 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  95
  96 /*
  97  * We can have multiple work items (and connection probing)
  98  * scheduling this timer, but we need to take care to only
  99  * reschedule it when it should fire _earlier_ than it was
 100  * asked for before, or if it's not pending right now. This
 101  * function ensures that. Note that it then is required to
 102  * run this function for all timeouts after the first one
 103  * has happened -- the work that runs from this timer will
 104  * do that.
 105  */
 106 static void run_again(struct ieee80211_sub_if_data *sdata,
 107                       unsigned long timeout)
 108 {
 109         sdata_assert_lock(sdata);
 110
 111         if (!timer_pending(&sdata->u.mgd.timer) ||
 112             time_before(timeout, sdata->u.mgd.timer.expires))
 113                 mod_timer(&sdata->u.mgd.timer, timeout);
 114 }
 115
 116 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 117 {
 118         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 119                 return;
 120
 121         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 122                 return;
 123
 124         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 125                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 126 }
 127
 128 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 129 {
 130         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 131
 132         if (unlikely(!sdata->u.mgd.associated))
 133                 return;
 134
 135         ifmgd->probe_send_count = 0;
 136
 137         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 138                 return;
 139
 140         mod_timer(&sdata->u.mgd.conn_mon_timer,
 141                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 142 }
 143
 144 static int ecw2cw(int ecw)
 145 {
 146         return (1 << ecw) - 1;
 147 }
 148
 149 static u32
 150 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 151                              struct ieee80211_supported_band *sband,
 152                              struct ieee80211_channel *channel,
 153                              const struct ieee80211_ht_cap *ht_cap,
 154                              const struct ieee80211_ht_operation *ht_oper,
 155                              const struct ieee80211_vht_operation *vht_oper,
 156                              struct cfg80211_chan_def *chandef, bool tracking)
 157 {
 158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 159         struct cfg80211_chan_def vht_chandef;
 160         u32 ht_cfreq, ret;
 161
 162         chandef->chan = channel;
 163         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 164         chandef->center_freq1 = channel->center_freq;
 165         chandef->center_freq2 = 0;
 166
 167         if (!ht_cap || !ht_oper || !sband->ht_cap.ht_supported) {
 168                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 169                 goto out;
 170         }
 171
 172         chandef->width = NL80211_CHAN_WIDTH_20;
 173
 174         if (!(ht_cap->cap_info &
 175               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 176                 ret = IEEE80211_STA_DISABLE_40MHZ;
 177                 goto out;
 178         }
 179
 180         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 181                                                   channel->band);
 182         /* check that channel matches the right operating channel */
 183         if (!tracking && channel->center_freq != ht_cfreq) {
 184                 /*
 185                  * It's possible that some APs are confused here;
 186                  * Netgear WNDR3700 sometimes reports 4 higher than
 187                  * the actual channel in association responses, but
 188                  * since we look at probe response/beacon data here
 189                  * it should be OK.
 190                  */
 191                 sdata_info(sdata,
 192                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 193                            channel->center_freq, ht_cfreq,
 194                            ht_oper->primary_chan, channel->band);
 195                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 196                 goto out;
 197         }
 198
 199         /* check 40 MHz support, if we have it */
 200         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 201                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 202                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 203                         chandef->width = NL80211_CHAN_WIDTH_40;
 204                         chandef->center_freq1 += 10;
 205                         break;
 206                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 207                         chandef->width = NL80211_CHAN_WIDTH_40;
 208                         chandef->center_freq1 -= 10;
 209                         break;
 210                 }
 211         } else {
 212                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 213                 ret = IEEE80211_STA_DISABLE_VHT;
 214                 /* also mark 40 MHz disabled */
 215                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 216                 goto out;
 217         }
 218
 219         if (!vht_oper || !sband->vht_cap.vht_supported) {
 220                 ret = IEEE80211_STA_DISABLE_VHT;
 221                 goto out;
 222         }
 223
 224         vht_chandef.chan = channel;
 225         vht_chandef.center_freq1 =
 226                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 227                                                channel->band);
 228         vht_chandef.center_freq2 = 0;
 229
 230         switch (vht_oper->chan_width) {
 231         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 232                 vht_chandef.width = chandef->width;
 233                 vht_chandef.center_freq1 = chandef->center_freq1;
 234                 break;
 235         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 236                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 237                 break;
 238         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 239                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 240                 break;
 241         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 242                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 243                 vht_chandef.center_freq2 =
 244                         ieee80211_channel_to_frequency(
 245                                 vht_oper->center_freq_seg2_idx,
 246                                 channel->band);
 247                 break;
 248         default:
 249                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 250                         sdata_info(sdata,
 251                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 252                                    vht_oper->chan_width);
 253                 ret = IEEE80211_STA_DISABLE_VHT;
 254                 goto out;
 255         }
 256
 257         if (!cfg80211_chandef_valid(&vht_chandef)) {
 258                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 259                         sdata_info(sdata,
 260                                    "AP VHT information is invalid, disable VHT\n");
 261                 ret = IEEE80211_STA_DISABLE_VHT;
 262                 goto out;
 263         }
 264
 265         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 266                 ret = 0;
 267                 goto out;
 268         }
 269
 270         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 271                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 272                         sdata_info(sdata,
 273                                    "AP VHT information doesn't match HT, disable VHT\n");
 274                 ret = IEEE80211_STA_DISABLE_VHT;
 275                 goto out;
 276         }
 277
 278         *chandef = vht_chandef;
 279
 280         ret = 0;
 281
 282 out:
 283         /*
 284          * When tracking the current AP, don't do any further checks if the
 285          * new chandef is identical to the one we're currently using for the
 286          * connection. This keeps us from playing ping-pong with regulatory,
 287          * without it the following can happen (for example):
 288          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 289          *  - AP advertises regdom US
 290          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 291          *  - the code below detects an unsupported channel, downgrades, and
 292          *    we disconnect from the AP in the caller
 293          *  - disconnect causes CRDA to reload world regdomain and the game
 294          *    starts anew.
 295          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 296          *
 297          * It seems possible that there are still scenarios with CSA or real
 298          * bandwidth changes where a this could happen, but those cases are
 299          * less common and wouldn't completely prevent using the AP.
 300          */
 301         if (tracking &&
 302             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 303                 return ret;
 304
 305         /* don't print the message below for VHT mismatch if VHT is disabled */
 306         if (ret & IEEE80211_STA_DISABLE_VHT)
 307                 vht_chandef = *chandef;
 308
 309         /*
 310          * Ignore the DISABLED flag when we're already connected and only
 311          * tracking the APs beacon for bandwidth changes - otherwise we
 312          * might get disconnected here if we connect to an AP, update our
 313          * regulatory information based on the AP's country IE and the
 314          * information we have is wrong/outdated and disables the channel
 315          * that we're actually using for the connection to the AP.
 316          */
 317         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 318                                         tracking ? 0 :
 319                                                    IEEE80211_CHAN_DISABLED)) {
 320                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 321                         ret = IEEE80211_STA_DISABLE_HT |
 322                               IEEE80211_STA_DISABLE_VHT;
 323                         break;
 324                 }
 325
 326                 ret |= ieee80211_chandef_downgrade(chandef);
 327         }
 328
 329         if (chandef->width != vht_chandef.width && !tracking)
 330                 sdata_info(sdata,
 331                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 332
 333         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 334         return ret;
 335 }
 336
 337 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 338                                struct sta_info *sta,
 339                                const struct ieee80211_ht_cap *ht_cap,
 340                                const struct ieee80211_ht_operation *ht_oper,
 341                                const struct ieee80211_vht_operation *vht_oper,
 342                                const u8 *bssid, u32 *changed)
 343 {
 344         struct ieee80211_local *local = sdata->local;
 345         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 346         struct ieee80211_supported_band *sband;
 347         struct ieee80211_channel *chan;
 348         struct cfg80211_chan_def chandef;
 349         u16 ht_opmode;
 350         u32 flags;
 351         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 352         int ret;
 353
 354         /* if HT was/is disabled, don't track any bandwidth changes */
 355         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 356                 return 0;
 357
 358         /* don't check VHT if we associated as non-VHT station */
 359         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 360                 vht_oper = NULL;
 361
 362         if (WARN_ON_ONCE(!sta))
 363                 return -EINVAL;
 364
 365         /*
 366          * if bss configuration changed store the new one -
 367          * this may be applicable even if channel is identical
 368          */
 369         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 370         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 371                 *changed |= BSS_CHANGED_HT;
 372                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 373         }
 374
 375         chan = sdata->vif.bss_conf.chandef.chan;
 376         sband = local->hw.wiphy->bands[chan->band];
 377
 378         /* calculate new channel (type) based on HT/VHT operation IEs */
 379         flags = ieee80211_determine_chantype(sdata, sband, chan,
 380                                              ht_cap, ht_oper, vht_oper,
 381                                              &chandef, true);
 382
 383         /*
 384          * Downgrade the new channel if we associated with restricted
 385          * capabilities. For example, if we associated as a 20 MHz STA
 386          * to a 40 MHz AP (due to regulatory, capabilities or config
 387          * reasons) then switching to a 40 MHz channel now won't do us
 388          * any good -- we couldn't use it with the AP.
 389          */
 390         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 391             chandef.width == NL80211_CHAN_WIDTH_80P80)
 392                 flags |= ieee80211_chandef_downgrade(&chandef);
 393         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 394             chandef.width == NL80211_CHAN_WIDTH_160)
 395                 flags |= ieee80211_chandef_downgrade(&chandef);
 396         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 397             chandef.width > NL80211_CHAN_WIDTH_20)
 398                 flags |= ieee80211_chandef_downgrade(&chandef);
 399
 400         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 401                 return 0;
 402
 403         sdata_info(sdata,
 404                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 405                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 406                    chandef.center_freq1, chandef.center_freq2);
 407
 408         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 409                                       IEEE80211_STA_DISABLE_VHT |
 410                                       IEEE80211_STA_DISABLE_40MHZ |
 411                                       IEEE80211_STA_DISABLE_80P80MHZ |
 412                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 413             !cfg80211_chandef_valid(&chandef)) {
 414                 sdata_info(sdata,
 415                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 416                            ifmgd->bssid);
 417                 return -EINVAL;
 418         }
 419
 420         switch (chandef.width) {
 421         case NL80211_CHAN_WIDTH_20_NOHT:
 422         case NL80211_CHAN_WIDTH_20:
 423                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 424                 break;
 425         case NL80211_CHAN_WIDTH_40:
 426                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 427                 break;
 428         case NL80211_CHAN_WIDTH_80:
 429                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 430                 break;
 431         case NL80211_CHAN_WIDTH_80P80:
 432         case NL80211_CHAN_WIDTH_160:
 433                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 434                 break;
 435         default:
 436                 return -EINVAL;
 437         }
 438
 439         if (new_sta_bw > sta->cur_max_bandwidth)
 440                 new_sta_bw = sta->cur_max_bandwidth;
 441
 442         if (new_sta_bw < sta->sta.bandwidth) {
 443                 sta->sta.bandwidth = new_sta_bw;
 444                 rate_control_rate_update(local, sband, sta,
 445                                          IEEE80211_RC_BW_CHANGED);
 446         }
 447
 448         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 449         if (ret) {
 450                 sdata_info(sdata,
 451                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 452                            ifmgd->bssid);
 453                 return ret;
 454         }
 455
 456         if (new_sta_bw > sta->sta.bandwidth) {
 457                 sta->sta.bandwidth = new_sta_bw;
 458                 rate_control_rate_update(local, sband, sta,
 459                                          IEEE80211_RC_BW_CHANGED);
 460         }
 461
 462         return 0;
 463 }
 464
 465 /* frame sending functions */
 466
 467 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 468                                 struct sk_buff *skb, u8 ap_ht_param,
 469                                 struct ieee80211_supported_band *sband,
 470                                 struct ieee80211_channel *channel,
 471                                 enum ieee80211_smps_mode smps)
 472 {
 473         u8 *pos;
 474         u32 flags = channel->flags;
 475         u16 cap;
 476         struct ieee80211_sta_ht_cap ht_cap;
 477
 478         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 479
 480         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 481         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 482
 483         /* determine capability flags */
 484         cap = ht_cap.cap;
 485
 486         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 487         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 488                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 489                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 490                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 491                 }
 492                 break;
 493         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 494                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 495                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 496                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 497                 }
 498                 break;
 499         }
 500
 501         /*
 502          * If 40 MHz was disabled associate as though we weren't
 503          * capable of 40 MHz -- some broken APs will never fall
 504          * back to trying to transmit in 20 MHz.
 505          */
 506         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 507                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 508                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 509         }
 510
 511         /* set SM PS mode properly */
 512         cap &= ~IEEE80211_HT_CAP_SM_PS;
 513         switch (smps) {
 514         case IEEE80211_SMPS_AUTOMATIC:
 515         case IEEE80211_SMPS_NUM_MODES:
 516                 WARN_ON(1);
 517         case IEEE80211_SMPS_OFF:
 518                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 519                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 520                 break;
 521         case IEEE80211_SMPS_STATIC:
 522                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 523                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 524                 break;
 525         case IEEE80211_SMPS_DYNAMIC:
 526                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 527                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 528                 break;
 529         }
 530
 531         /* reserve and fill IE */
 532         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 533         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 534 }
 535
 536 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 537                                  struct sk_buff *skb,
 538                                  struct ieee80211_supported_band *sband,
 539                                  struct ieee80211_vht_cap *ap_vht_cap)
 540 {
 541         u8 *pos;
 542         u32 cap;
 543         struct ieee80211_sta_vht_cap vht_cap;
 544         u32 mask, ap_bf_sts, our_bf_sts;
 545
 546         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 547
 548         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 549         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 550
 551         /* determine capability flags */
 552         cap = vht_cap.cap;
 553
 554         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 555                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 556
 557                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 558                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 559                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 560                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 561         }
 562
 563         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 564                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 565                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 566         }
 567
 568         /*
 569          * Some APs apparently get confused if our capabilities are better
 570          * than theirs, so restrict what we advertise in the assoc request.
 571          */
 572         if (!(ap_vht_cap->vht_cap_info &
 573                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 574                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 575
 576         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 577
 578         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 579         our_bf_sts = cap & mask;
 580
 581         if (ap_bf_sts < our_bf_sts) {
 582                 cap &= ~mask;
 583                 cap |= ap_bf_sts;
 584         }
 585
 586         /* reserve and fill IE */
 587         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 588         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 589 }
 590
 591 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 592 {
 593         struct ieee80211_local *local = sdata->local;
 594         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 595         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 596         struct sk_buff *skb;
 597         struct ieee80211_mgmt *mgmt;
 598         u8 *pos, qos_info;
 599         size_t offset = 0, noffset;
 600         int i, count, rates_len, supp_rates_len, shift;
 601         u16 capab;
 602         struct ieee80211_supported_band *sband;
 603         struct ieee80211_chanctx_conf *chanctx_conf;
 604         struct ieee80211_channel *chan;
 605         u32 rate_flags, rates = 0;
 606
 607         sdata_assert_lock(sdata);
 608
 609         rcu_read_lock();
 610         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 611         if (WARN_ON(!chanctx_conf)) {
 612                 rcu_read_unlock();
 613                 return;
 614         }
 615         chan = chanctx_conf->def.chan;
 616         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 617         rcu_read_unlock();
 618         sband = local->hw.wiphy->bands[chan->band];
 619         shift = ieee80211_vif_get_shift(&sdata->vif);
 620
 621         if (assoc_data->supp_rates_len) {
 622                 /*
 623                  * Get all rates supported by the device and the AP as
 624                  * some APs don't like getting a superset of their rates
 625                  * in the association request (e.g. D-Link DAP 1353 in
 626                  * b-only mode)...
 627                  */
 628                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 629                                                      assoc_data->supp_rates,
 630                                                      assoc_data->supp_rates_len,
 631                                                      &rates);
 632         } else {
 633                 /*
 634                  * In case AP not provide any supported rates information
 635                  * before association, we send information element(s) with
 636                  * all rates that we support.
 637                  */
 638                 rates_len = 0;
 639                 for (i = 0; i < sband->n_bitrates; i++) {
 640                         if ((rate_flags & sband->bitrates[i].flags)
 641                             != rate_flags)
 642                                 continue;
 643                         rates |= BIT(i);
 644                         rates_len++;
 645                 }
 646         }
 647
 648         skb = alloc_skb(local->hw.extra_tx_headroom +
 649                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 650                         2 + assoc_data->ssid_len + /* SSID */
 651                         4 + rates_len + /* (extended) rates */
 652                         4 + /* power capability */
 653                         2 + 2 * sband->n_channels + /* supported channels */
 654                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 655                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 656                         assoc_data->ie_len + /* extra IEs */
 657                         9, /* WMM */
 658                         GFP_KERNEL);
 659         if (!skb)
 660                 return;
 661
 662         skb_reserve(skb, local->hw.extra_tx_headroom);
 663
 664         capab = WLAN_CAPABILITY_ESS;
 665
 666         if (sband->band == IEEE80211_BAND_2GHZ) {
 667                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 668                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 669                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 670                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 671         }
 672
 673         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 674                 capab |= WLAN_CAPABILITY_PRIVACY;
 675
 676         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 677             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 678                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 679
 680         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 681                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 682
 683         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 684         memset(mgmt, 0, 24);
 685         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 686         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 687         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 688
 689         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 690                 skb_put(skb, 10);
 691                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 692                                                   IEEE80211_STYPE_REASSOC_REQ);
 693                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 694                 mgmt->u.reassoc_req.listen_interval =
 695                                 cpu_to_le16(local->hw.conf.listen_interval);
 696                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 697                        ETH_ALEN);
 698         } else {
 699                 skb_put(skb, 4);
 700                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 701                                                   IEEE80211_STYPE_ASSOC_REQ);
 702                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 703                 mgmt->u.assoc_req.listen_interval =
 704                                 cpu_to_le16(local->hw.conf.listen_interval);
 705         }
 706
 707         /* SSID */
 708         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 709         *pos++ = WLAN_EID_SSID;
 710         *pos++ = assoc_data->ssid_len;
 711         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 712
 713         /* add all rates which were marked to be used above */
 714         supp_rates_len = rates_len;
 715         if (supp_rates_len > 8)
 716                 supp_rates_len = 8;
 717
 718         pos = skb_put(skb, supp_rates_len + 2);
 719         *pos++ = WLAN_EID_SUPP_RATES;
 720         *pos++ = supp_rates_len;
 721
 722         count = 0;
 723         for (i = 0; i < sband->n_bitrates; i++) {
 724                 if (BIT(i) & rates) {
 725                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 726                                                 5 * (1 << shift));
 727                         *pos++ = (u8) rate;
 728                         if (++count == 8)
 729                                 break;
 730                 }
 731         }
 732
 733         if (rates_len > count) {
 734                 pos = skb_put(skb, rates_len - count + 2);
 735                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 736                 *pos++ = rates_len - count;
 737
 738                 for (i++; i < sband->n_bitrates; i++) {
 739                         if (BIT(i) & rates) {
 740                                 int rate;
 741                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 742                                                     5 * (1 << shift));
 743                                 *pos++ = (u8) rate;
 744                         }
 745                 }
 746         }
 747
 748         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 749             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 750                 pos = skb_put(skb, 4);
 751                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 752                 *pos++ = 2;
 753                 *pos++ = 0; /* min tx power */
 754                  /* max tx power */
 755                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 756         }
 757
 758         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 759                 /* TODO: get this in reg domain format */
 760                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 761                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 762                 *pos++ = 2 * sband->n_channels;
 763                 for (i = 0; i < sband->n_channels; i++) {
 764                         *pos++ = ieee80211_frequency_to_channel(
 765                                         sband->channels[i].center_freq);
 766                         *pos++ = 1; /* one channel in the subband*/
 767                 }
 768         }
 769
 770         /* if present, add any custom IEs that go before HT */
 771         if (assoc_data->ie_len) {
 772                 static const u8 before_ht[] = {
 773                         WLAN_EID_SSID,
 774                         WLAN_EID_SUPP_RATES,
 775                         WLAN_EID_EXT_SUPP_RATES,
 776                         WLAN_EID_PWR_CAPABILITY,
 777                         WLAN_EID_SUPPORTED_CHANNELS,
 778                         WLAN_EID_RSN,
 779                         WLAN_EID_QOS_CAPA,
 780                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 781                         WLAN_EID_MOBILITY_DOMAIN,
 782                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 783                         WLAN_EID_RIC_DATA,              /* reassoc only */
 784                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 785                 };
 786                 static const u8 after_ric[] = {
 787                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 788                         WLAN_EID_HT_CAPABILITY,
 789                         WLAN_EID_BSS_COEX_2040,
 790                         WLAN_EID_EXT_CAPABILITY,
 791                         WLAN_EID_QOS_TRAFFIC_CAPA,
 792                         WLAN_EID_TIM_BCAST_REQ,
 793                         WLAN_EID_INTERWORKING,
 794                         /* 60GHz doesn't happen right now */
 795                         WLAN_EID_VHT_CAPABILITY,
 796                         WLAN_EID_OPMODE_NOTIF,
 797                 };
 798
 799                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 800                                                  assoc_data->ie_len,
 801                                                  before_ht,
 802                                                  ARRAY_SIZE(before_ht),
 803                                                  after_ric,
 804                                                  ARRAY_SIZE(after_ric),
 805                                                  offset);
 806                 pos = skb_put(skb, noffset - offset);
 807                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 808                 offset = noffset;
 809         }
 810
 811         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 812                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 813                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 814
 815         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 816                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 817                                     sband, chan, sdata->smps_mode);
 818
 819         /* if present, add any custom IEs that go before VHT */
 820         if (assoc_data->ie_len) {
 821                 static const u8 before_vht[] = {
 822                         WLAN_EID_SSID,
 823                         WLAN_EID_SUPP_RATES,
 824                         WLAN_EID_EXT_SUPP_RATES,
 825                         WLAN_EID_PWR_CAPABILITY,
 826                         WLAN_EID_SUPPORTED_CHANNELS,
 827                         WLAN_EID_RSN,
 828                         WLAN_EID_QOS_CAPA,
 829                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 830                         WLAN_EID_MOBILITY_DOMAIN,
 831                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 832                         WLAN_EID_HT_CAPABILITY,
 833                         WLAN_EID_BSS_COEX_2040,
 834                         WLAN_EID_EXT_CAPABILITY,
 835                         WLAN_EID_QOS_TRAFFIC_CAPA,
 836                         WLAN_EID_TIM_BCAST_REQ,
 837                         WLAN_EID_INTERWORKING,
 838                 };
 839
 840                 /* RIC already taken above, so no need to handle here anymore */
 841                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 842                                              before_vht, ARRAY_SIZE(before_vht),
 843                                              offset);
 844                 pos = skb_put(skb, noffset - offset);
 845                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 846                 offset = noffset;
 847         }
 848
 849         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 850                 ieee80211_add_vht_ie(sdata, skb, sband,
 851                                      &assoc_data->ap_vht_cap);
 852
 853         /* if present, add any custom non-vendor IEs that go after HT */
 854         if (assoc_data->ie_len) {
 855                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 856                                                     assoc_data->ie_len,
 857                                                     offset);
 858                 pos = skb_put(skb, noffset - offset);
 859                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 860                 offset = noffset;
 861         }
 862
 863         if (assoc_data->wmm) {
 864                 if (assoc_data->uapsd) {
 865                         qos_info = ifmgd->uapsd_queues;
 866                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 867                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 868                 } else {
 869                         qos_info = 0;
 870                 }
 871
 872                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 873         }
 874
 875         /* add any remaining custom (i.e. vendor specific here) IEs */
 876         if (assoc_data->ie_len) {
 877                 noffset = assoc_data->ie_len;
 878                 pos = skb_put(skb, noffset - offset);
 879                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 880         }
 881
 882         drv_mgd_prepare_tx(local, sdata);
 883
 884         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 885         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 886                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 887                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 888         ieee80211_tx_skb(sdata, skb);
 889 }
 890
 891 void ieee80211_send_pspoll(struct ieee80211_local *local,
 892                            struct ieee80211_sub_if_data *sdata)
 893 {
 894         struct ieee80211_pspoll *pspoll;
 895         struct sk_buff *skb;
 896
 897         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 898         if (!skb)
 899                 return;
 900
 901         pspoll = (struct ieee80211_pspoll *) skb->data;
 902         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 903
 904         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 905         ieee80211_tx_skb(sdata, skb);
 906 }
 907
 908 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 909                              struct ieee80211_sub_if_data *sdata,
 910                              int powersave)
 911 {
 912         struct sk_buff *skb;
 913         struct ieee80211_hdr_3addr *nullfunc;
 914         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 915
 916         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 917         if (!skb)
 918                 return;
 919
 920         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 921         if (powersave)
 922                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 923
 924         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 925                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 926
 927         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 928                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 929
 930         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 931                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 932
 933         ieee80211_tx_skb(sdata, skb);
 934 }
 935
 936 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 937                                           struct ieee80211_sub_if_data *sdata)
 938 {
 939         struct sk_buff *skb;
 940         struct ieee80211_hdr *nullfunc;
 941         __le16 fc;
 942
 943         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 944                 return;
 945
 946         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 947         if (!skb)
 948                 return;
 949
 950         skb_reserve(skb, local->hw.extra_tx_headroom);
 951
 952         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 953         memset(nullfunc, 0, 30);
 954         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 955                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 956         nullfunc->frame_control = fc;
 957         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 958         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 959         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 960         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 961
 962         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 963         ieee80211_tx_skb(sdata, skb);
 964 }
 965
 966 /* spectrum management related things */
 967 static void ieee80211_chswitch_work(struct work_struct *work)
 968 {
 969         struct ieee80211_sub_if_data *sdata =
 970                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 971         struct ieee80211_local *local = sdata->local;
 972         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 973         int ret;
 974
 975         if (!ieee80211_sdata_running(sdata))
 976                 return;
 977
 978         sdata_lock(sdata);
 979         mutex_lock(&local->mtx);
 980         mutex_lock(&local->chanctx_mtx);
 981
 982         if (!ifmgd->associated)
 983                 goto out;
 984
 985         if (!sdata->vif.csa_active)
 986                 goto out;
 987
 988         /*
 989          * using reservation isn't immediate as it may be deferred until later
 990          * with multi-vif. once reservation is complete it will re-schedule the
 991          * work with no reserved_chanctx so verify chandef to check if it
 992          * completed successfully
 993          */
 994
 995         if (sdata->reserved_chanctx) {
 996                 /*
 997                  * with multi-vif csa driver may call ieee80211_csa_finish()
 998                  * many times while waiting for other interfaces to use their
 999                  * reservations
1000                  */
1001                 if (sdata->reserved_ready)
1002                         goto out;
1003
1004                 ret = ieee80211_vif_use_reserved_context(sdata);
1005                 if (ret) {
1006                         sdata_info(sdata,
1007                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1008                                    ret);
1009                         ieee80211_queue_work(&sdata->local->hw,
1010                                              &ifmgd->csa_connection_drop_work);
1011                         goto out;
1012                 }
1013
1014                 goto out;
1015         }
1016
1017         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1018                                         &sdata->csa_chandef)) {
1019                 sdata_info(sdata,
1020                            "failed to finalize channel switch, disconnecting\n");
1021                 ieee80211_queue_work(&sdata->local->hw,
1022                                      &ifmgd->csa_connection_drop_work);
1023                 goto out;
1024         }
1025
1026         /* XXX: shouldn't really modify cfg80211-owned data! */
1027         ifmgd->associated->channel = sdata->csa_chandef.chan;
1028
1029         ifmgd->csa_waiting_bcn = true;
1030
1031         ieee80211_sta_reset_beacon_monitor(sdata);
1032         ieee80211_sta_reset_conn_monitor(sdata);
1033
1034 out:
1035         mutex_unlock(&local->chanctx_mtx);
1036         mutex_unlock(&local->mtx);
1037         sdata_unlock(sdata);
1038 }
1039
1040 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1041 {
1042         struct ieee80211_local *local = sdata->local;
1043         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1044         int ret;
1045
1046         sdata_assert_lock(sdata);
1047
1048         WARN_ON(!sdata->vif.csa_active);
1049
1050         if (sdata->csa_block_tx) {
1051                 ieee80211_wake_vif_queues(local, sdata,
1052                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1053                 sdata->csa_block_tx = false;
1054         }
1055
1056         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1057
1058         sdata->vif.csa_active = false;
1059         ifmgd->csa_waiting_bcn = false;
1060
1061         ret = drv_post_channel_switch(sdata);
1062         if (ret) {
1063                 sdata_info(sdata,
1064                            "driver post channel switch failed, disconnecting\n");
1065                 ieee80211_queue_work(&local->hw,
1066                                      &ifmgd->csa_connection_drop_work);
1067                 return;
1068         }
1069 }
1070
1071 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1072 {
1073         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1074         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1075
1076         trace_api_chswitch_done(sdata, success);
1077         if (!success) {
1078                 sdata_info(sdata,
1079                            "driver channel switch failed, disconnecting\n");
1080                 ieee80211_queue_work(&sdata->local->hw,
1081                                      &ifmgd->csa_connection_drop_work);
1082         } else {
1083                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1084         }
1085 }
1086 EXPORT_SYMBOL(ieee80211_chswitch_done);
1087
1088 static void ieee80211_chswitch_timer(unsigned long data)
1089 {
1090         struct ieee80211_sub_if_data *sdata =
1091                 (struct ieee80211_sub_if_data *) data;
1092
1093         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1094 }
1095
1096 static void
1097 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1098                                  u64 timestamp, u32 device_timestamp,
1099                                  struct ieee802_11_elems *elems,
1100                                  bool beacon)
1101 {
1102         struct ieee80211_local *local = sdata->local;
1103         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1104         struct cfg80211_bss *cbss = ifmgd->associated;
1105         struct ieee80211_chanctx_conf *conf;
1106         struct ieee80211_chanctx *chanctx;
1107         enum ieee80211_band current_band;
1108         struct ieee80211_csa_ie csa_ie;
1109         struct ieee80211_channel_switch ch_switch;
1110         int res;
1111
1112         sdata_assert_lock(sdata);
1113
1114         if (!cbss)
1115                 return;
1116
1117         if (local->scanning)
1118                 return;
1119
1120         /* disregard subsequent announcements if we are already processing */
1121         if (sdata->vif.csa_active)
1122                 return;
1123
1124         current_band = cbss->channel->band;
1125         memset(&csa_ie, 0, sizeof(csa_ie));
1126         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1127                                            ifmgd->flags,
1128                                            ifmgd->associated->bssid, &csa_ie);
1129         if (res < 0)
1130                 ieee80211_queue_work(&local->hw,
1131                                      &ifmgd->csa_connection_drop_work);
1132         if (res)
1133                 return;
1134
1135         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1136                                      IEEE80211_CHAN_DISABLED)) {
1137                 sdata_info(sdata,
1138                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1139                            ifmgd->associated->bssid,
1140                            csa_ie.chandef.chan->center_freq,
1141                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1142                            csa_ie.chandef.center_freq2);
1143                 ieee80211_queue_work(&local->hw,
1144                                      &ifmgd->csa_connection_drop_work);
1145                 return;
1146         }
1147
1148         mutex_lock(&local->mtx);
1149         mutex_lock(&local->chanctx_mtx);
1150         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1151                                          lockdep_is_held(&local->chanctx_mtx));
1152         if (!conf) {
1153                 sdata_info(sdata,
1154                            "no channel context assigned to vif?, disconnecting\n");
1155                 ieee80211_queue_work(&local->hw,
1156                                      &ifmgd->csa_connection_drop_work);
1157                 mutex_unlock(&local->chanctx_mtx);
1158                 mutex_unlock(&local->mtx);
1159                 return;
1160         }
1161
1162         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1163
1164         if (local->use_chanctx &&
1165             !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1166                 sdata_info(sdata,
1167                            "driver doesn't support chan-switch with channel contexts\n");
1168                 ieee80211_queue_work(&local->hw,
1169                                      &ifmgd->csa_connection_drop_work);
1170                 mutex_unlock(&local->chanctx_mtx);
1171                 mutex_unlock(&local->mtx);
1172                 return;
1173         }
1174
1175         ch_switch.timestamp = timestamp;
1176         ch_switch.device_timestamp = device_timestamp;
1177         ch_switch.block_tx = csa_ie.mode;
1178         ch_switch.chandef = csa_ie.chandef;
1179         ch_switch.count = csa_ie.count;
1180
1181         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1182                 sdata_info(sdata,
1183                            "preparing for channel switch failed, disconnecting\n");
1184                 ieee80211_queue_work(&local->hw,
1185                                      &ifmgd->csa_connection_drop_work);
1186                 mutex_unlock(&local->chanctx_mtx);
1187                 mutex_unlock(&local->mtx);
1188                 return;
1189         }
1190
1191         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1192                                             chanctx->mode, false);
1193         if (res) {
1194                 sdata_info(sdata,
1195                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1196                            res);
1197                 ieee80211_queue_work(&local->hw,
1198                                      &ifmgd->csa_connection_drop_work);
1199                 mutex_unlock(&local->chanctx_mtx);
1200                 mutex_unlock(&local->mtx);
1201                 return;
1202         }
1203         mutex_unlock(&local->chanctx_mtx);
1204
1205         sdata->vif.csa_active = true;
1206         sdata->csa_chandef = csa_ie.chandef;
1207         sdata->csa_block_tx = csa_ie.mode;
1208
1209         if (sdata->csa_block_tx)
1210                 ieee80211_stop_vif_queues(local, sdata,
1211                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1212         mutex_unlock(&local->mtx);
1213
1214         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1215                                           csa_ie.count);
1216
1217         if (local->ops->channel_switch) {
1218                 /* use driver's channel switch callback */
1219                 drv_channel_switch(local, sdata, &ch_switch);
1220                 return;
1221         }
1222
1223         /* channel switch handled in software */
1224         if (csa_ie.count <= 1)
1225                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1226         else
1227                 mod_timer(&ifmgd->chswitch_timer,
1228                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1229                                          cbss->beacon_interval));
1230 }
1231
1232 static bool
1233 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1234                                  struct ieee80211_channel *channel,
1235                                  const u8 *country_ie, u8 country_ie_len,
1236                                  const u8 *pwr_constr_elem,
1237                                  int *chan_pwr, int *pwr_reduction)
1238 {
1239         struct ieee80211_country_ie_triplet *triplet;
1240         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1241         int i, chan_increment;
1242         bool have_chan_pwr = false;
1243
1244         /* Invalid IE */
1245         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1246                 return false;
1247
1248         triplet = (void *)(country_ie + 3);
1249         country_ie_len -= 3;
1250
1251         switch (channel->band) {
1252         default:
1253                 WARN_ON_ONCE(1);
1254                 /* fall through */
1255         case IEEE80211_BAND_2GHZ:
1256         case IEEE80211_BAND_60GHZ:
1257                 chan_increment = 1;
1258                 break;
1259         case IEEE80211_BAND_5GHZ:
1260                 chan_increment = 4;
1261                 break;
1262         }
1263
1264         /* find channel */
1265         while (country_ie_len >= 3) {
1266                 u8 first_channel = triplet->chans.first_channel;
1267
1268                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1269                         goto next;
1270
1271                 for (i = 0; i < triplet->chans.num_channels; i++) {
1272                         if (first_channel + i * chan_increment == chan) {
1273                                 have_chan_pwr = true;
1274                                 *chan_pwr = triplet->chans.max_power;
1275                                 break;
1276                         }
1277                 }
1278                 if (have_chan_pwr)
1279                         break;
1280
1281  next:
1282                 triplet++;
1283                 country_ie_len -= 3;
1284         }
1285
1286         if (have_chan_pwr)
1287                 *pwr_reduction = *pwr_constr_elem;
1288         return have_chan_pwr;
1289 }
1290
1291 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1292                                       struct ieee80211_channel *channel,
1293                                       const u8 *cisco_dtpc_ie,
1294                                       int *pwr_level)
1295 {
1296         /* From practical testing, the first data byte of the DTPC element
1297          * seems to contain the requested dBm level, and the CLI on Cisco
1298          * APs clearly state the range is -127 to 127 dBm, which indicates
1299          * a signed byte, although it seemingly never actually goes negative.
1300          * The other byte seems to always be zero.
1301          */
1302         *pwr_level = (__s8)cisco_dtpc_ie[4];
1303 }
1304
1305 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1306                                        struct ieee80211_channel *channel,
1307                                        struct ieee80211_mgmt *mgmt,
1308                                        const u8 *country_ie, u8 country_ie_len,
1309                                        const u8 *pwr_constr_ie,
1310                                        const u8 *cisco_dtpc_ie)
1311 {
1312         bool has_80211h_pwr = false, has_cisco_pwr = false;
1313         int chan_pwr = 0, pwr_reduction_80211h = 0;
1314         int pwr_level_cisco, pwr_level_80211h;
1315         int new_ap_level;
1316
1317         if (country_ie && pwr_constr_ie &&
1318             mgmt->u.probe_resp.capab_info &
1319                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT)) {
1320                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1321                         sdata, channel, country_ie, country_ie_len,
1322                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1323                 pwr_level_80211h =
1324                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1325         }
1326
1327         if (cisco_dtpc_ie) {
1328                 ieee80211_find_cisco_dtpc(
1329                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1330                 has_cisco_pwr = true;
1331         }
1332
1333         if (!has_80211h_pwr && !has_cisco_pwr)
1334                 return 0;
1335
1336         /* If we have both 802.11h and Cisco DTPC, apply both limits
1337          * by picking the smallest of the two power levels advertised.
1338          */
1339         if (has_80211h_pwr &&
1340             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1341                 sdata_info(sdata,
1342                            "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1343                            pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1344                            sdata->u.mgd.bssid);
1345                 new_ap_level = pwr_level_80211h;
1346         } else {  /* has_cisco_pwr is always true here. */
1347                 sdata_info(sdata,
1348                            "Limiting TX power to %d dBm as advertised by %pM\n",
1349                            pwr_level_cisco, sdata->u.mgd.bssid);
1350                 new_ap_level = pwr_level_cisco;
1351         }
1352
1353         if (sdata->ap_power_level == new_ap_level)
1354                 return 0;
1355
1356         sdata->ap_power_level = new_ap_level;
1357         if (__ieee80211_recalc_txpower(sdata))
1358                 return BSS_CHANGED_TXPOWER;
1359         return 0;
1360 }
1361
1362 /* powersave */
1363 static void ieee80211_enable_ps(struct ieee80211_local *local,
1364                                 struct ieee80211_sub_if_data *sdata)
1365 {
1366         struct ieee80211_conf *conf = &local->hw.conf;
1367
1368         /*
1369          * If we are scanning right now then the parameters will
1370          * take effect when scan finishes.
1371          */
1372         if (local->scanning)
1373                 return;
1374
1375         if (conf->dynamic_ps_timeout > 0 &&
1376             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1377                 mod_timer(&local->dynamic_ps_timer, jiffies +
1378                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1379         } else {
1380                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1381                         ieee80211_send_nullfunc(local, sdata, 1);
1382
1383                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1384                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1385                         return;
1386
1387                 conf->flags |= IEEE80211_CONF_PS;
1388                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1389         }
1390 }
1391
1392 static void ieee80211_change_ps(struct ieee80211_local *local)
1393 {
1394         struct ieee80211_conf *conf = &local->hw.conf;
1395
1396         if (local->ps_sdata) {
1397                 ieee80211_enable_ps(local, local->ps_sdata);
1398         } else if (conf->flags & IEEE80211_CONF_PS) {
1399                 conf->flags &= ~IEEE80211_CONF_PS;
1400                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1401                 del_timer_sync(&local->dynamic_ps_timer);
1402                 cancel_work_sync(&local->dynamic_ps_enable_work);
1403         }
1404 }
1405
1406 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1407 {
1408         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1409         struct sta_info *sta = NULL;
1410         bool authorized = false;
1411
1412         if (!mgd->powersave)
1413                 return false;
1414
1415         if (mgd->broken_ap)
1416                 return false;
1417
1418         if (!mgd->associated)
1419                 return false;
1420
1421         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1422                 return false;
1423
1424         if (!mgd->have_beacon)
1425                 return false;
1426
1427         rcu_read_lock();
1428         sta = sta_info_get(sdata, mgd->bssid);
1429         if (sta)
1430                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1431         rcu_read_unlock();
1432
1433         return authorized;
1434 }
1435
1436 /* need to hold RTNL or interface lock */
1437 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1438 {
1439         struct ieee80211_sub_if_data *sdata, *found = NULL;
1440         int count = 0;
1441         int timeout;
1442
1443         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1444                 local->ps_sdata = NULL;
1445                 return;
1446         }
1447
1448         list_for_each_entry(sdata, &local->interfaces, list) {
1449                 if (!ieee80211_sdata_running(sdata))
1450                         continue;
1451                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1452                         /* If an AP vif is found, then disable PS
1453                          * by setting the count to zero thereby setting
1454                          * ps_sdata to NULL.
1455                          */
1456                         count = 0;
1457                         break;
1458                 }
1459                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1460                         continue;
1461                 found = sdata;
1462                 count++;
1463         }
1464
1465         if (count == 1 && ieee80211_powersave_allowed(found)) {
1466                 s32 beaconint_us;
1467
1468                 if (latency < 0)
1469                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1470
1471                 beaconint_us = ieee80211_tu_to_usec(
1472                                         found->vif.bss_conf.beacon_int);
1473
1474                 timeout = local->dynamic_ps_forced_timeout;
1475                 if (timeout < 0) {
1476                         /*
1477                          * Go to full PSM if the user configures a very low
1478                          * latency requirement.
1479                          * The 2000 second value is there for compatibility
1480                          * until the PM_QOS_NETWORK_LATENCY is configured
1481                          * with real values.
1482                          */
1483                         if (latency > (1900 * USEC_PER_MSEC) &&
1484                             latency != (2000 * USEC_PER_SEC))
1485                                 timeout = 0;
1486                         else
1487                                 timeout = 100;
1488                 }
1489                 local->hw.conf.dynamic_ps_timeout = timeout;
1490
1491                 if (beaconint_us > latency) {
1492                         local->ps_sdata = NULL;
1493                 } else {
1494                         int maxslp = 1;
1495                         u8 dtimper = found->u.mgd.dtim_period;
1496
1497                         /* If the TIM IE is invalid, pretend the value is 1 */
1498                         if (!dtimper)
1499                                 dtimper = 1;
1500                         else if (dtimper > 1)
1501                                 maxslp = min_t(int, dtimper,
1502                                                     latency / beaconint_us);
1503
1504                         local->hw.conf.max_sleep_period = maxslp;
1505                         local->hw.conf.ps_dtim_period = dtimper;
1506                         local->ps_sdata = found;
1507                 }
1508         } else {
1509                 local->ps_sdata = NULL;
1510         }
1511
1512         ieee80211_change_ps(local);
1513 }
1514
1515 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1516 {
1517         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1518
1519         if (sdata->vif.bss_conf.ps != ps_allowed) {
1520                 sdata->vif.bss_conf.ps = ps_allowed;
1521                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1522         }
1523 }
1524
1525 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1526 {
1527         struct ieee80211_local *local =
1528                 container_of(work, struct ieee80211_local,
1529                              dynamic_ps_disable_work);
1530
1531         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1532                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1533                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1534         }
1535
1536         ieee80211_wake_queues_by_reason(&local->hw,
1537                                         IEEE80211_MAX_QUEUE_MAP,
1538                                         IEEE80211_QUEUE_STOP_REASON_PS,
1539                                         false);
1540 }
1541
1542 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1543 {
1544         struct ieee80211_local *local =
1545                 container_of(work, struct ieee80211_local,
1546                              dynamic_ps_enable_work);
1547         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1548         struct ieee80211_if_managed *ifmgd;
1549         unsigned long flags;
1550         int q;
1551
1552         /* can only happen when PS was just disabled anyway */
1553         if (!sdata)
1554                 return;
1555
1556         ifmgd = &sdata->u.mgd;
1557
1558         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1559                 return;
1560
1561         if (local->hw.conf.dynamic_ps_timeout > 0) {
1562                 /* don't enter PS if TX frames are pending */
1563                 if (drv_tx_frames_pending(local)) {
1564                         mod_timer(&local->dynamic_ps_timer, jiffies +
1565                                   msecs_to_jiffies(
1566                                   local->hw.conf.dynamic_ps_timeout));
1567                         return;
1568                 }
1569
1570                 /*
1571                  * transmission can be stopped by others which leads to
1572                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1573                  * is not the actual idle state.
1574                  */
1575                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1576                 for (q = 0; q < local->hw.queues; q++) {
1577                         if (local->queue_stop_reasons[q]) {
1578                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1579                                                        flags);
1580                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1581                                           msecs_to_jiffies(
1582                                           local->hw.conf.dynamic_ps_timeout));
1583                                 return;
1584                         }
1585                 }
1586                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1587         }
1588
1589         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1590             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1591                 if (drv_tx_frames_pending(local)) {
1592                         mod_timer(&local->dynamic_ps_timer, jiffies +
1593                                   msecs_to_jiffies(
1594                                   local->hw.conf.dynamic_ps_timeout));
1595                 } else {
1596                         ieee80211_send_nullfunc(local, sdata, 1);
1597                         /* Flush to get the tx status of nullfunc frame */
1598                         ieee80211_flush_queues(local, sdata);
1599                 }
1600         }
1601
1602         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1603               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1604             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1605                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1606                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1607                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1608         }
1609 }
1610
1611 void ieee80211_dynamic_ps_timer(unsigned long data)
1612 {
1613         struct ieee80211_local *local = (void *) data;
1614
1615         if (local->quiescing || local->suspended)
1616                 return;
1617
1618         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1619 }
1620
1621 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1622 {
1623         struct delayed_work *delayed_work =
1624                 container_of(work, struct delayed_work, work);
1625         struct ieee80211_sub_if_data *sdata =
1626                 container_of(delayed_work, struct ieee80211_sub_if_data,
1627                              dfs_cac_timer_work);
1628         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1629
1630         mutex_lock(&sdata->local->mtx);
1631         if (sdata->wdev.cac_started) {
1632                 ieee80211_vif_release_channel(sdata);
1633                 cfg80211_cac_event(sdata->dev, &chandef,
1634                                    NL80211_RADAR_CAC_FINISHED,
1635                                    GFP_KERNEL);
1636         }
1637         mutex_unlock(&sdata->local->mtx);
1638 }
1639
1640 static bool
1641 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1642 {
1643         struct ieee80211_local *local = sdata->local;
1644         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1645         bool ret;
1646         int ac;
1647
1648         if (local->hw.queues < IEEE80211_NUM_ACS)
1649                 return false;
1650
1651         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1652                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1653                 int non_acm_ac;
1654                 unsigned long now = jiffies;
1655
1656                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1657                     tx_tspec->admitted_time &&
1658                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1659                         tx_tspec->consumed_tx_time = 0;
1660                         tx_tspec->time_slice_start = now;
1661
1662                         if (tx_tspec->downgraded)
1663                                 tx_tspec->action =
1664                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1665                 }
1666
1667                 switch (tx_tspec->action) {
1668                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1669                         /* take the original parameters */
1670                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1671                                 sdata_err(sdata,
1672                                           "failed to set TX queue parameters for queue %d\n",
1673                                           ac);
1674                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1675                         tx_tspec->downgraded = false;
1676                         ret = true;
1677                         break;
1678                 case TX_TSPEC_ACTION_DOWNGRADE:
1679                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1680                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1681                                 ret = true;
1682                                 break;
1683                         }
1684                         /* downgrade next lower non-ACM AC */
1685                         for (non_acm_ac = ac + 1;
1686                              non_acm_ac < IEEE80211_NUM_ACS;
1687                              non_acm_ac++)
1688                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1689                                         break;
1690                         /* The loop will result in using BK even if it requires
1691                          * admission control, such configuration makes no sense
1692                          * and we have to transmit somehow - the AC selection
1693                          * does the same thing.
1694                          */
1695                         if (drv_conf_tx(local, sdata, ac,
1696                                         &sdata->tx_conf[non_acm_ac]))
1697                                 sdata_err(sdata,
1698                                           "failed to set TX queue parameters for queue %d\n",
1699                                           ac);
1700                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1701                         ret = true;
1702                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1703                                 tx_tspec->time_slice_start + HZ - now + 1);
1704                         break;
1705                 case TX_TSPEC_ACTION_NONE:
1706                         /* nothing now */
1707                         break;
1708                 }
1709         }
1710
1711         return ret;
1712 }
1713
1714 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1715 {
1716         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1717                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1718 }
1719
1720 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1721 {
1722         struct ieee80211_sub_if_data *sdata;
1723
1724         sdata = container_of(work, struct ieee80211_sub_if_data,
1725                              u.mgd.tx_tspec_wk.work);
1726         ieee80211_sta_handle_tspec_ac_params(sdata);
1727 }
1728
1729 /* MLME */
1730 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1731                                      struct ieee80211_sub_if_data *sdata,
1732                                      const u8 *wmm_param, size_t wmm_param_len)
1733 {
1734         struct ieee80211_tx_queue_params params;
1735         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1736         size_t left;
1737         int count;
1738         const u8 *pos;
1739         u8 uapsd_queues = 0;
1740
1741         if (!local->ops->conf_tx)
1742                 return false;
1743
1744         if (local->hw.queues < IEEE80211_NUM_ACS)
1745                 return false;
1746
1747         if (!wmm_param)
1748                 return false;
1749
1750         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1751                 return false;
1752
1753         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1754                 uapsd_queues = ifmgd->uapsd_queues;
1755
1756         count = wmm_param[6] & 0x0f;
1757         if (count == ifmgd->wmm_last_param_set)
1758                 return false;
1759         ifmgd->wmm_last_param_set = count;
1760
1761         pos = wmm_param + 8;
1762         left = wmm_param_len - 8;
1763
1764         memset(&params, 0, sizeof(params));
1765
1766         sdata->wmm_acm = 0;
1767         for (; left >= 4; left -= 4, pos += 4) {
1768                 int aci = (pos[0] >> 5) & 0x03;
1769                 int acm = (pos[0] >> 4) & 0x01;
1770                 bool uapsd = false;
1771                 int queue;
1772
1773                 switch (aci) {
1774                 case 1: /* AC_BK */
1775                         queue = 3;
1776                         if (acm)
1777                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1778                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1779                                 uapsd = true;
1780                         break;
1781                 case 2: /* AC_VI */
1782                         queue = 1;
1783                         if (acm)
1784                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1785                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1786                                 uapsd = true;
1787                         break;
1788                 case 3: /* AC_VO */
1789                         queue = 0;
1790                         if (acm)
1791                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1792                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1793                                 uapsd = true;
1794                         break;
1795                 case 0: /* AC_BE */
1796                 default:
1797                         queue = 2;
1798                         if (acm)
1799                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1800                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1801                                 uapsd = true;
1802                         break;
1803                 }
1804
1805                 params.aifs = pos[0] & 0x0f;
1806                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1807                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1808                 params.txop = get_unaligned_le16(pos + 2);
1809                 params.acm = acm;
1810                 params.uapsd = uapsd;
1811
1812                 mlme_dbg(sdata,
1813                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1814                          queue, aci, acm,
1815                          params.aifs, params.cw_min, params.cw_max,
1816                          params.txop, params.uapsd,
1817                          ifmgd->tx_tspec[queue].downgraded);
1818                 sdata->tx_conf[queue] = params;
1819                 if (!ifmgd->tx_tspec[queue].downgraded &&
1820                     drv_conf_tx(local, sdata, queue, &params))
1821                         sdata_err(sdata,
1822                                   "failed to set TX queue parameters for queue %d\n",
1823                                   queue);
1824         }
1825
1826         /* enable WMM or activate new settings */
1827         sdata->vif.bss_conf.qos = true;
1828         return true;
1829 }
1830
1831 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1832 {
1833         lockdep_assert_held(&sdata->local->mtx);
1834
1835         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1836         ieee80211_run_deferred_scan(sdata->local);
1837 }
1838
1839 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1840 {
1841         mutex_lock(&sdata->local->mtx);
1842         __ieee80211_stop_poll(sdata);
1843         mutex_unlock(&sdata->local->mtx);
1844 }
1845
1846 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1847                                            u16 capab, bool erp_valid, u8 erp)
1848 {
1849         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1850         u32 changed = 0;
1851         bool use_protection;
1852         bool use_short_preamble;
1853         bool use_short_slot;
1854
1855         if (erp_valid) {
1856                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1857                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1858         } else {
1859                 use_protection = false;
1860                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1861         }
1862
1863         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1864         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1865                 use_short_slot = true;
1866
1867         if (use_protection != bss_conf->use_cts_prot) {
1868                 bss_conf->use_cts_prot = use_protection;
1869                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1870         }
1871
1872         if (use_short_preamble != bss_conf->use_short_preamble) {
1873                 bss_conf->use_short_preamble = use_short_preamble;
1874                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1875         }
1876
1877         if (use_short_slot != bss_conf->use_short_slot) {
1878                 bss_conf->use_short_slot = use_short_slot;
1879                 changed |= BSS_CHANGED_ERP_SLOT;
1880         }
1881
1882         return changed;
1883 }
1884
1885 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1886                                      struct cfg80211_bss *cbss,
1887                                      u32 bss_info_changed)
1888 {
1889         struct ieee80211_bss *bss = (void *)cbss->priv;
1890         struct ieee80211_local *local = sdata->local;
1891         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1892
1893         bss_info_changed |= BSS_CHANGED_ASSOC;
1894         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1895                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1896
1897         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1898                 beacon_loss_count * bss_conf->beacon_int));
1899
1900         sdata->u.mgd.associated = cbss;
1901         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1902
1903         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1904
1905         if (sdata->vif.p2p) {
1906                 const struct cfg80211_bss_ies *ies;
1907
1908                 rcu_read_lock();
1909                 ies = rcu_dereference(cbss->ies);
1910                 if (ies) {
1911                         int ret;
1912
1913                         ret = cfg80211_get_p2p_attr(
1914                                         ies->data, ies->len,
1915                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1916                                         (u8 *) &bss_conf->p2p_noa_attr,
1917                                         sizeof(bss_conf->p2p_noa_attr));
1918                         if (ret >= 2) {
1919                                 sdata->u.mgd.p2p_noa_index =
1920                                         bss_conf->p2p_noa_attr.index;
1921                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1922                         }
1923                 }
1924                 rcu_read_unlock();
1925         }
1926
1927         /* just to be sure */
1928         ieee80211_stop_poll(sdata);
1929
1930         ieee80211_led_assoc(local, 1);
1931
1932         if (sdata->u.mgd.have_beacon) {
1933                 /*
1934                  * If the AP is buggy we may get here with no DTIM period
1935                  * known, so assume it's 1 which is the only safe assumption
1936                  * in that case, although if the TIM IE is broken powersave
1937                  * probably just won't work at all.
1938                  */
1939                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1940                 bss_conf->beacon_rate = bss->beacon_rate;
1941                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1942         } else {
1943                 bss_conf->beacon_rate = NULL;
1944                 bss_conf->dtim_period = 0;
1945         }
1946
1947         bss_conf->assoc = 1;
1948
1949         /* Tell the driver to monitor connection quality (if supported) */
1950         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1951             bss_conf->cqm_rssi_thold)
1952                 bss_info_changed |= BSS_CHANGED_CQM;
1953
1954         /* Enable ARP filtering */
1955         if (bss_conf->arp_addr_cnt)
1956                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1957
1958         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1959
1960         mutex_lock(&local->iflist_mtx);
1961         ieee80211_recalc_ps(local, -1);
1962         mutex_unlock(&local->iflist_mtx);
1963
1964         ieee80211_recalc_smps(sdata);
1965         ieee80211_recalc_ps_vif(sdata);
1966
1967         netif_carrier_on(sdata->dev);
1968 }
1969
1970 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1971                                    u16 stype, u16 reason, bool tx,
1972                                    u8 *frame_buf)
1973 {
1974         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1975         struct ieee80211_local *local = sdata->local;
1976         u32 changed = 0;
1977
1978         sdata_assert_lock(sdata);
1979
1980         if (WARN_ON_ONCE(tx && !frame_buf))
1981                 return;
1982
1983         if (WARN_ON(!ifmgd->associated))
1984                 return;
1985
1986         ieee80211_stop_poll(sdata);
1987
1988         ifmgd->associated = NULL;
1989         netif_carrier_off(sdata->dev);
1990
1991         /*
1992          * if we want to get out of ps before disassoc (why?) we have
1993          * to do it before sending disassoc, as otherwise the null-packet
1994          * won't be valid.
1995          */
1996         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1997                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1998                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1999         }
2000         local->ps_sdata = NULL;
2001
2002         /* disable per-vif ps */
2003         ieee80211_recalc_ps_vif(sdata);
2004
2005         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
2006         if (tx)
2007                 ieee80211_flush_queues(local, sdata);
2008
2009         /* deauthenticate/disassociate now */
2010         if (tx || frame_buf)
2011                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2012                                                reason, tx, frame_buf);
2013
2014         /* flush out frame */
2015         if (tx)
2016                 ieee80211_flush_queues(local, sdata);
2017
2018         /* clear bssid only after building the needed mgmt frames */
2019         memset(ifmgd->bssid, 0, ETH_ALEN);
2020
2021         /* remove AP and TDLS peers */
2022         sta_info_flush(sdata);
2023
2024         /* finally reset all BSS / config parameters */
2025         changed |= ieee80211_reset_erp_info(sdata);
2026
2027         ieee80211_led_assoc(local, 0);
2028         changed |= BSS_CHANGED_ASSOC;
2029         sdata->vif.bss_conf.assoc = false;
2030
2031         ifmgd->p2p_noa_index = -1;
2032         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2033                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2034
2035         /* on the next assoc, re-program HT/VHT parameters */
2036         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2037         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2038         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2039         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2040
2041         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2042
2043         del_timer_sync(&local->dynamic_ps_timer);
2044         cancel_work_sync(&local->dynamic_ps_enable_work);
2045
2046         /* Disable ARP filtering */
2047         if (sdata->vif.bss_conf.arp_addr_cnt)
2048                 changed |= BSS_CHANGED_ARP_FILTER;
2049
2050         sdata->vif.bss_conf.qos = false;
2051         changed |= BSS_CHANGED_QOS;
2052
2053         /* The BSSID (not really interesting) and HT changed */
2054         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2055         ieee80211_bss_info_change_notify(sdata, changed);
2056
2057         /* disassociated - set to defaults now */
2058         ieee80211_set_wmm_default(sdata, false);
2059
2060         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2061         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2062         del_timer_sync(&sdata->u.mgd.timer);
2063         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2064
2065         sdata->vif.bss_conf.dtim_period = 0;
2066         sdata->vif.bss_conf.beacon_rate = NULL;
2067
2068         ifmgd->have_beacon = false;
2069
2070         ifmgd->flags = 0;
2071         mutex_lock(&local->mtx);
2072         ieee80211_vif_release_channel(sdata);
2073
2074         sdata->vif.csa_active = false;
2075         ifmgd->csa_waiting_bcn = false;
2076         if (sdata->csa_block_tx) {
2077                 ieee80211_wake_vif_queues(local, sdata,
2078                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2079                 sdata->csa_block_tx = false;
2080         }
2081         mutex_unlock(&local->mtx);
2082
2083         /* existing TX TSPEC sessions no longer exist */
2084         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2085         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2086
2087         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2088 }
2089
2090 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2091                              struct ieee80211_hdr *hdr)
2092 {
2093         /*
2094          * We can postpone the mgd.timer whenever receiving unicast frames
2095          * from AP because we know that the connection is working both ways
2096          * at that time. But multicast frames (and hence also beacons) must
2097          * be ignored here, because we need to trigger the timer during
2098          * data idle periods for sending the periodic probe request to the
2099          * AP we're connected to.
2100          */
2101         if (is_multicast_ether_addr(hdr->addr1))
2102                 return;
2103
2104         ieee80211_sta_reset_conn_monitor(sdata);
2105 }
2106
2107 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2108 {
2109         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2110         struct ieee80211_local *local = sdata->local;
2111
2112         mutex_lock(&local->mtx);
2113         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2114                 goto out;
2115
2116         __ieee80211_stop_poll(sdata);
2117
2118         mutex_lock(&local->iflist_mtx);
2119         ieee80211_recalc_ps(local, -1);
2120         mutex_unlock(&local->iflist_mtx);
2121
2122         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2123                 goto out;
2124
2125         /*
2126          * We've received a probe response, but are not sure whether
2127          * we have or will be receiving any beacons or data, so let's
2128          * schedule the timers again, just in case.
2129          */
2130         ieee80211_sta_reset_beacon_monitor(sdata);
2131
2132         mod_timer(&ifmgd->conn_mon_timer,
2133                   round_jiffies_up(jiffies +
2134                                    IEEE80211_CONNECTION_IDLE_TIME));
2135 out:
2136         mutex_unlock(&local->mtx);
2137 }
2138
2139 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2140                                            struct ieee80211_hdr *hdr,
2141                                            u16 tx_time)
2142 {
2143         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2144         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2145         int ac = ieee80211_ac_from_tid(tid);
2146         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2147         unsigned long now = jiffies;
2148
2149         if (likely(!tx_tspec->admitted_time))
2150                 return;
2151
2152         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2153                 tx_tspec->consumed_tx_time = 0;
2154                 tx_tspec->time_slice_start = now;
2155
2156                 if (tx_tspec->downgraded) {
2157                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2158                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2159                 }
2160         }
2161
2162         if (tx_tspec->downgraded)
2163                 return;
2164
2165         tx_tspec->consumed_tx_time += tx_time;
2166
2167         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2168                 tx_tspec->downgraded = true;
2169                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2170                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2171         }
2172 }
2173
2174 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2175                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2176 {
2177         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2178
2179         if (!ieee80211_is_data(hdr->frame_control))
2180             return;
2181
2182         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2183             sdata->u.mgd.probe_send_count > 0) {
2184                 if (ack)
2185                         ieee80211_sta_reset_conn_monitor(sdata);
2186                 else
2187                         sdata->u.mgd.nullfunc_failed = true;
2188                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2189                 return;
2190         }
2191
2192         if (ack)
2193                 ieee80211_sta_reset_conn_monitor(sdata);
2194 }
2195
2196 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2197 {
2198         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2199         const u8 *ssid;
2200         u8 *dst = ifmgd->associated->bssid;
2201         u8 unicast_limit = max(1, max_probe_tries - 3);
2202
2203         /*
2204          * Try sending broadcast probe requests for the last three
2205          * probe requests after the first ones failed since some
2206          * buggy APs only support broadcast probe requests.
2207          */
2208         if (ifmgd->probe_send_count >= unicast_limit)
2209                 dst = NULL;
2210
2211         /*
2212          * When the hardware reports an accurate Tx ACK status, it's
2213          * better to send a nullfunc frame instead of a probe request,
2214          * as it will kick us off the AP quickly if we aren't associated
2215          * anymore. The timeout will be reset if the frame is ACKed by
2216          * the AP.
2217          */
2218         ifmgd->probe_send_count++;
2219
2220         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2221                 ifmgd->nullfunc_failed = false;
2222                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2223         } else {
2224                 int ssid_len;
2225
2226                 rcu_read_lock();
2227                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2228                 if (WARN_ON_ONCE(ssid == NULL))
2229                         ssid_len = 0;
2230                 else
2231                         ssid_len = ssid[1];
2232
2233                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
2234                                          ssid + 2, ssid_len, NULL,
2235                                          0, (u32) -1, true, 0,
2236                                          ifmgd->associated->channel, false);
2237                 rcu_read_unlock();
2238         }
2239
2240         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2241         run_again(sdata, ifmgd->probe_timeout);
2242 }
2243
2244 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2245                                    bool beacon)
2246 {
2247         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2248         bool already = false;
2249
2250         if (!ieee80211_sdata_running(sdata))
2251                 return;
2252
2253         sdata_lock(sdata);
2254
2255         if (!ifmgd->associated)
2256                 goto out;
2257
2258         mutex_lock(&sdata->local->mtx);
2259
2260         if (sdata->local->tmp_channel || sdata->local->scanning) {
2261                 mutex_unlock(&sdata->local->mtx);
2262                 goto out;
2263         }
2264
2265         if (beacon) {
2266                 mlme_dbg_ratelimited(sdata,
2267                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2268                                      beacon_loss_count);
2269
2270                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2271         }
2272
2273         /*
2274          * The driver/our work has already reported this event or the
2275          * connection monitoring has kicked in and we have already sent
2276          * a probe request. Or maybe the AP died and the driver keeps
2277          * reporting until we disassociate...
2278          *
2279          * In either case we have to ignore the current call to this
2280          * function (except for setting the correct probe reason bit)
2281          * because otherwise we would reset the timer every time and
2282          * never check whether we received a probe response!
2283          */
2284         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2285                 already = true;
2286
2287         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2288
2289         mutex_unlock(&sdata->local->mtx);
2290
2291         if (already)
2292                 goto out;
2293
2294         mutex_lock(&sdata->local->iflist_mtx);
2295         ieee80211_recalc_ps(sdata->local, -1);
2296         mutex_unlock(&sdata->local->iflist_mtx);
2297
2298         ifmgd->probe_send_count = 0;
2299         ieee80211_mgd_probe_ap_send(sdata);
2300  out:
2301         sdata_unlock(sdata);
2302 }
2303
2304 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2305                                           struct ieee80211_vif *vif)
2306 {
2307         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2308         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2309         struct cfg80211_bss *cbss;
2310         struct sk_buff *skb;
2311         const u8 *ssid;
2312         int ssid_len;
2313
2314         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2315                 return NULL;
2316
2317         sdata_assert_lock(sdata);
2318
2319         if (ifmgd->associated)
2320                 cbss = ifmgd->associated;
2321         else if (ifmgd->auth_data)
2322                 cbss = ifmgd->auth_data->bss;
2323         else if (ifmgd->assoc_data)
2324                 cbss = ifmgd->assoc_data->bss;
2325         else
2326                 return NULL;
2327
2328         rcu_read_lock();
2329         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2330         if (WARN_ON_ONCE(ssid == NULL))
2331                 ssid_len = 0;
2332         else
2333                 ssid_len = ssid[1];
2334
2335         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2336                                         (u32) -1, cbss->channel,
2337                                         ssid + 2, ssid_len,
2338                                         NULL, 0, true);
2339         rcu_read_unlock();
2340
2341         return skb;
2342 }
2343 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2344
2345 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2346 {
2347         struct ieee80211_local *local = sdata->local;
2348         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2349         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2350
2351         sdata_lock(sdata);
2352         if (!ifmgd->associated) {
2353                 sdata_unlock(sdata);
2354                 return;
2355         }
2356
2357         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2358                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2359                                true, frame_buf);
2360         mutex_lock(&local->mtx);
2361         sdata->vif.csa_active = false;
2362         ifmgd->csa_waiting_bcn = false;
2363         if (sdata->csa_block_tx) {
2364                 ieee80211_wake_vif_queues(local, sdata,
2365                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2366                 sdata->csa_block_tx = false;
2367         }
2368         mutex_unlock(&local->mtx);
2369
2370         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2371                               IEEE80211_DEAUTH_FRAME_LEN);
2372         sdata_unlock(sdata);
2373 }
2374
2375 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2376 {
2377         struct ieee80211_sub_if_data *sdata =
2378                 container_of(work, struct ieee80211_sub_if_data,
2379                              u.mgd.beacon_connection_loss_work);
2380         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2381         struct sta_info *sta;
2382
2383         if (ifmgd->associated) {
2384                 rcu_read_lock();
2385                 sta = sta_info_get(sdata, ifmgd->bssid);
2386                 if (sta)
2387                         sta->beacon_loss_count++;
2388                 rcu_read_unlock();
2389         }
2390
2391         if (ifmgd->connection_loss) {
2392                 sdata_info(sdata, "Connection to AP %pM lost\n",
2393                            ifmgd->bssid);
2394                 __ieee80211_disconnect(sdata);
2395         } else {
2396                 ieee80211_mgd_probe_ap(sdata, true);
2397         }
2398 }
2399
2400 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2401 {
2402         struct ieee80211_sub_if_data *sdata =
2403                 container_of(work, struct ieee80211_sub_if_data,
2404                              u.mgd.csa_connection_drop_work);
2405
2406         __ieee80211_disconnect(sdata);
2407 }
2408
2409 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2410 {
2411         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2412         struct ieee80211_hw *hw = &sdata->local->hw;
2413
2414         trace_api_beacon_loss(sdata);
2415
2416         sdata->u.mgd.connection_loss = false;
2417         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2418 }
2419 EXPORT_SYMBOL(ieee80211_beacon_loss);
2420
2421 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2422 {
2423         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2424         struct ieee80211_hw *hw = &sdata->local->hw;
2425
2426         trace_api_connection_loss(sdata);
2427
2428         sdata->u.mgd.connection_loss = true;
2429         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2430 }
2431 EXPORT_SYMBOL(ieee80211_connection_loss);
2432
2433
2434 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2435                                         bool assoc)
2436 {
2437         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2438
2439         sdata_assert_lock(sdata);
2440
2441         if (!assoc) {
2442                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2443
2444                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2445                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2446                 sdata->u.mgd.flags = 0;
2447                 mutex_lock(&sdata->local->mtx);
2448                 ieee80211_vif_release_channel(sdata);
2449                 mutex_unlock(&sdata->local->mtx);
2450         }
2451
2452         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2453         kfree(auth_data);
2454         sdata->u.mgd.auth_data = NULL;
2455 }
2456
2457 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2458                                      struct ieee80211_mgmt *mgmt, size_t len)
2459 {
2460         struct ieee80211_local *local = sdata->local;
2461         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2462         u8 *pos;
2463         struct ieee802_11_elems elems;
2464         u32 tx_flags = 0;
2465
2466         pos = mgmt->u.auth.variable;
2467         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2468         if (!elems.challenge)
2469                 return;
2470         auth_data->expected_transaction = 4;
2471         drv_mgd_prepare_tx(sdata->local, sdata);
2472         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2473                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2474                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2475         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2476                             elems.challenge - 2, elems.challenge_len + 2,
2477                             auth_data->bss->bssid, auth_data->bss->bssid,
2478                             auth_data->key, auth_data->key_len,
2479                             auth_data->key_idx, tx_flags);
2480 }
2481
2482 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2483                                    struct ieee80211_mgmt *mgmt, size_t len)
2484 {
2485         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2486         u8 bssid[ETH_ALEN];
2487         u16 auth_alg, auth_transaction, status_code;
2488         struct sta_info *sta;
2489
2490         sdata_assert_lock(sdata);
2491
2492         if (len < 24 + 6)
2493                 return;
2494
2495         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2496                 return;
2497
2498         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2499
2500         if (!ether_addr_equal(bssid, mgmt->bssid))
2501                 return;
2502
2503         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2504         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2505         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2506
2507         if (auth_alg != ifmgd->auth_data->algorithm ||
2508             auth_transaction != ifmgd->auth_data->expected_transaction) {
2509                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2510                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2511                            auth_transaction,
2512                            ifmgd->auth_data->expected_transaction);
2513                 return;
2514         }
2515
2516         if (status_code != WLAN_STATUS_SUCCESS) {
2517                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2518                            mgmt->sa, status_code);
2519                 ieee80211_destroy_auth_data(sdata, false);
2520                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2521                 return;
2522         }
2523
2524         switch (ifmgd->auth_data->algorithm) {
2525         case WLAN_AUTH_OPEN:
2526         case WLAN_AUTH_LEAP:
2527         case WLAN_AUTH_FT:
2528         case WLAN_AUTH_SAE:
2529                 break;
2530         case WLAN_AUTH_SHARED_KEY:
2531                 if (ifmgd->auth_data->expected_transaction != 4) {
2532                         ieee80211_auth_challenge(sdata, mgmt, len);
2533                         /* need another frame */
2534                         return;
2535                 }
2536                 break;
2537         default:
2538                 WARN_ONCE(1, "invalid auth alg %d",
2539                           ifmgd->auth_data->algorithm);
2540                 return;
2541         }
2542
2543         sdata_info(sdata, "authenticated\n");
2544         ifmgd->auth_data->done = true;
2545         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2546         ifmgd->auth_data->timeout_started = true;
2547         run_again(sdata, ifmgd->auth_data->timeout);
2548
2549         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2550             ifmgd->auth_data->expected_transaction != 2) {
2551                 /*
2552                  * Report auth frame to user space for processing since another
2553                  * round of Authentication frames is still needed.
2554                  */
2555                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2556                 return;
2557         }
2558
2559         /* move station state to auth */
2560         mutex_lock(&sdata->local->sta_mtx);
2561         sta = sta_info_get(sdata, bssid);
2562         if (!sta) {
2563                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2564                 goto out_err;
2565         }
2566         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2567                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2568                 goto out_err;
2569         }
2570         mutex_unlock(&sdata->local->sta_mtx);
2571
2572         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2573         return;
2574  out_err:
2575         mutex_unlock(&sdata->local->sta_mtx);
2576         /* ignore frame -- wait for timeout */
2577 }
2578
2579 #define case_WLAN(type) \
2580         case WLAN_REASON_##type: return #type
2581
2582 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2583 {
2584         switch (reason_code) {
2585         case_WLAN(UNSPECIFIED);
2586         case_WLAN(PREV_AUTH_NOT_VALID);
2587         case_WLAN(DEAUTH_LEAVING);
2588         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2589         case_WLAN(DISASSOC_AP_BUSY);
2590         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2591         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2592         case_WLAN(DISASSOC_STA_HAS_LEFT);
2593         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2594         case_WLAN(DISASSOC_BAD_POWER);
2595         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2596         case_WLAN(INVALID_IE);
2597         case_WLAN(MIC_FAILURE);
2598         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2599         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2600         case_WLAN(IE_DIFFERENT);
2601         case_WLAN(INVALID_GROUP_CIPHER);
2602         case_WLAN(INVALID_PAIRWISE_CIPHER);
2603         case_WLAN(INVALID_AKMP);
2604         case_WLAN(UNSUPP_RSN_VERSION);
2605         case_WLAN(INVALID_RSN_IE_CAP);
2606         case_WLAN(IEEE8021X_FAILED);
2607         case_WLAN(CIPHER_SUITE_REJECTED);
2608         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2609         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2610         case_WLAN(DISASSOC_LOW_ACK);
2611         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2612         case_WLAN(QSTA_LEAVE_QBSS);
2613         case_WLAN(QSTA_NOT_USE);
2614         case_WLAN(QSTA_REQUIRE_SETUP);
2615         case_WLAN(QSTA_TIMEOUT);
2616         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2617         case_WLAN(MESH_PEER_CANCELED);
2618         case_WLAN(MESH_MAX_PEERS);
2619         case_WLAN(MESH_CONFIG);
2620         case_WLAN(MESH_CLOSE);
2621         case_WLAN(MESH_MAX_RETRIES);
2622         case_WLAN(MESH_CONFIRM_TIMEOUT);
2623         case_WLAN(MESH_INVALID_GTK);
2624         case_WLAN(MESH_INCONSISTENT_PARAM);
2625         case_WLAN(MESH_INVALID_SECURITY);
2626         case_WLAN(MESH_PATH_ERROR);
2627         case_WLAN(MESH_PATH_NOFORWARD);
2628         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2629         case_WLAN(MAC_EXISTS_IN_MBSS);
2630         case_WLAN(MESH_CHAN_REGULATORY);
2631         case_WLAN(MESH_CHAN);
2632         default: return "<unknown>";
2633         }
2634 }
2635
2636 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2637                                      struct ieee80211_mgmt *mgmt, size_t len)
2638 {
2639         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2640         const u8 *bssid = NULL;
2641         u16 reason_code;
2642
2643         sdata_assert_lock(sdata);
2644
2645         if (len < 24 + 2)
2646                 return;
2647
2648         if (!ifmgd->associated ||
2649             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2650                 return;
2651
2652         bssid = ifmgd->associated->bssid;
2653
2654         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2655
2656         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2657                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2658
2659         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2660
2661         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2662 }
2663
2664
2665 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2666                                        struct ieee80211_mgmt *mgmt, size_t len)
2667 {
2668         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2669         u16 reason_code;
2670
2671         sdata_assert_lock(sdata);
2672
2673         if (len < 24 + 2)
2674                 return;
2675
2676         if (!ifmgd->associated ||
2677             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2678                 return;
2679
2680         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2681
2682         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2683                    mgmt->sa, reason_code);
2684
2685         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2686
2687         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2688 }
2689
2690 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2691                                 u8 *supp_rates, unsigned int supp_rates_len,
2692                                 u32 *rates, u32 *basic_rates,
2693                                 bool *have_higher_than_11mbit,
2694                                 int *min_rate, int *min_rate_index,
2695                                 int shift, u32 rate_flags)
2696 {
2697         int i, j;
2698
2699         for (i = 0; i < supp_rates_len; i++) {
2700                 int rate = supp_rates[i] & 0x7f;
2701                 bool is_basic = !!(supp_rates[i] & 0x80);
2702
2703                 if ((rate * 5 * (1 << shift)) > 110)
2704                         *have_higher_than_11mbit = true;
2705
2706                 /*
2707                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2708                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2709                  *
2710                  * Note: Even through the membership selector and the basic
2711                  *       rate flag share the same bit, they are not exactly
2712                  *       the same.
2713                  */
2714                 if (!!(supp_rates[i] & 0x80) &&
2715                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2716                         continue;
2717
2718                 for (j = 0; j < sband->n_bitrates; j++) {
2719                         struct ieee80211_rate *br;
2720                         int brate;
2721
2722                         br = &sband->bitrates[j];
2723                         if ((rate_flags & br->flags) != rate_flags)
2724                                 continue;
2725
2726                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2727                         if (brate == rate) {
2728                                 *rates |= BIT(j);
2729                                 if (is_basic)
2730                                         *basic_rates |= BIT(j);
2731                                 if ((rate * 5) < *min_rate) {
2732                                         *min_rate = rate * 5;
2733                                         *min_rate_index = j;
2734                                 }
2735                                 break;
2736                         }
2737                 }
2738         }
2739 }
2740
2741 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2742                                          bool assoc)
2743 {
2744         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2745
2746         sdata_assert_lock(sdata);
2747
2748         if (!assoc) {
2749                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2750
2751                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2752                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2753                 sdata->u.mgd.flags = 0;
2754                 mutex_lock(&sdata->local->mtx);
2755                 ieee80211_vif_release_channel(sdata);
2756                 mutex_unlock(&sdata->local->mtx);
2757         }
2758
2759         kfree(assoc_data);
2760         sdata->u.mgd.assoc_data = NULL;
2761 }
2762
2763 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2764                                     struct cfg80211_bss *cbss,
2765                                     struct ieee80211_mgmt *mgmt, size_t len)
2766 {
2767         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2768         struct ieee80211_local *local = sdata->local;
2769         struct ieee80211_supported_band *sband;
2770         struct sta_info *sta;
2771         u8 *pos;
2772         u16 capab_info, aid;
2773         struct ieee802_11_elems elems;
2774         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2775         const struct cfg80211_bss_ies *bss_ies = NULL;
2776         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2777         u32 changed = 0;
2778         int err;
2779         bool ret;
2780
2781         /* AssocResp and ReassocResp have identical structure */
2782
2783         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2784         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2785
2786         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2787                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2788                            aid);
2789         aid &= ~(BIT(15) | BIT(14));
2790
2791         ifmgd->broken_ap = false;
2792
2793         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2794                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2795                            aid);
2796                 aid = 0;
2797                 ifmgd->broken_ap = true;
2798         }
2799
2800         pos = mgmt->u.assoc_resp.variable;
2801         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2802
2803         if (!elems.supp_rates) {
2804                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2805                 return false;
2806         }
2807
2808         ifmgd->aid = aid;
2809         ifmgd->tdls_chan_switch_prohibited =
2810                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2811                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2812
2813         /*
2814          * Some APs are erroneously not including some information in their
2815          * (re)association response frames. Try to recover by using the data
2816          * from the beacon or probe response. This seems to afflict mobile
2817          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2818          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2819          */
2820         if ((assoc_data->wmm && !elems.wmm_param) ||
2821             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2822              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2823             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2824              (!elems.vht_cap_elem || !elems.vht_operation))) {
2825                 const struct cfg80211_bss_ies *ies;
2826                 struct ieee802_11_elems bss_elems;
2827
2828                 rcu_read_lock();
2829                 ies = rcu_dereference(cbss->ies);
2830                 if (ies)
2831                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2832                                           GFP_ATOMIC);
2833                 rcu_read_unlock();
2834                 if (!bss_ies)
2835                         return false;
2836
2837                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2838                                        false, &bss_elems);
2839                 if (assoc_data->wmm &&
2840                     !elems.wmm_param && bss_elems.wmm_param) {
2841                         elems.wmm_param = bss_elems.wmm_param;
2842                         sdata_info(sdata,
2843                                    "AP bug: WMM param missing from AssocResp\n");
2844                 }
2845
2846                 /*
2847                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2848                  * have to include the IEs in the (re)association response.
2849                  */
2850                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2851                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2852                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2853                         sdata_info(sdata,
2854                                    "AP bug: HT capability missing from AssocResp\n");
2855                 }
2856                 if (!elems.ht_operation && bss_elems.ht_operation &&
2857                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2858                         elems.ht_operation = bss_elems.ht_operation;
2859                         sdata_info(sdata,
2860                                    "AP bug: HT operation missing from AssocResp\n");
2861                 }
2862                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2863                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2864                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2865                         sdata_info(sdata,
2866                                    "AP bug: VHT capa missing from AssocResp\n");
2867                 }
2868                 if (!elems.vht_operation && bss_elems.vht_operation &&
2869                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2870                         elems.vht_operation = bss_elems.vht_operation;
2871                         sdata_info(sdata,
2872                                    "AP bug: VHT operation missing from AssocResp\n");
2873                 }
2874         }
2875
2876         /*
2877          * We previously checked these in the beacon/probe response, so
2878          * they should be present here. This is just a safety net.
2879          */
2880         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2881             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2882                 sdata_info(sdata,
2883                            "HT AP is missing WMM params or HT capability/operation\n");
2884                 ret = false;
2885                 goto out;
2886         }
2887
2888         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2889             (!elems.vht_cap_elem || !elems.vht_operation)) {
2890                 sdata_info(sdata,
2891                            "VHT AP is missing VHT capability/operation\n");
2892                 ret = false;
2893                 goto out;
2894         }
2895
2896         mutex_lock(&sdata->local->sta_mtx);
2897         /*
2898          * station info was already allocated and inserted before
2899          * the association and should be available to us
2900          */
2901         sta = sta_info_get(sdata, cbss->bssid);
2902         if (WARN_ON(!sta)) {
2903                 mutex_unlock(&sdata->local->sta_mtx);
2904                 ret = false;
2905                 goto out;
2906         }
2907
2908         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2909
2910         /* Set up internal HT/VHT capabilities */
2911         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2912                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2913                                                   elems.ht_cap_elem, sta);
2914
2915         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2916                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2917                                                     elems.vht_cap_elem, sta);
2918
2919         /*
2920          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2921          * in their association response, so ignore that data for our own
2922          * configuration. If it changed since the last beacon, we'll get the
2923          * next beacon and update then.
2924          */
2925
2926         /*
2927          * If an operating mode notification IE is present, override the
2928          * NSS calculation (that would be done in rate_control_rate_init())
2929          * and use the # of streams from that element.
2930          */
2931         if (elems.opmode_notif &&
2932             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2933                 u8 nss;
2934
2935                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2936                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2937                 nss += 1;
2938                 sta->sta.rx_nss = nss;
2939         }
2940
2941         rate_control_rate_init(sta);
2942
2943         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2944                 set_sta_flag(sta, WLAN_STA_MFP);
2945
2946         sta->sta.wme = elems.wmm_param;
2947
2948         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2949         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2950                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2951         if (err) {
2952                 sdata_info(sdata,
2953                            "failed to move station %pM to desired state\n",
2954                            sta->sta.addr);
2955                 WARN_ON(__sta_info_destroy(sta));
2956                 mutex_unlock(&sdata->local->sta_mtx);
2957                 ret = false;
2958                 goto out;
2959         }
2960
2961         mutex_unlock(&sdata->local->sta_mtx);
2962
2963         /*
2964          * Always handle WMM once after association regardless
2965          * of the first value the AP uses. Setting -1 here has
2966          * that effect because the AP values is an unsigned
2967          * 4-bit value.
2968          */
2969         ifmgd->wmm_last_param_set = -1;
2970
2971         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2972                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2973                                          elems.wmm_param_len);
2974         else
2975                 ieee80211_set_wmm_default(sdata, false);
2976         changed |= BSS_CHANGED_QOS;
2977
2978         /* set AID and assoc capability,
2979          * ieee80211_set_associated() will tell the driver */
2980         bss_conf->aid = aid;
2981         bss_conf->assoc_capability = capab_info;
2982         ieee80211_set_associated(sdata, cbss, changed);
2983
2984         /*
2985          * If we're using 4-addr mode, let the AP know that we're
2986          * doing so, so that it can create the STA VLAN on its side
2987          */
2988         if (ifmgd->use_4addr)
2989                 ieee80211_send_4addr_nullfunc(local, sdata);
2990
2991         /*
2992          * Start timer to probe the connection to the AP now.
2993          * Also start the timer that will detect beacon loss.
2994          */
2995         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2996         ieee80211_sta_reset_beacon_monitor(sdata);
2997
2998         ret = true;
2999  out:
3000         kfree(bss_ies);
3001         return ret;
3002 }
3003
3004 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3005                                          struct ieee80211_mgmt *mgmt,
3006                                          size_t len)
3007 {
3008         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3009         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3010         u16 capab_info, status_code, aid;
3011         struct ieee802_11_elems elems;
3012         int ac, uapsd_queues = -1;
3013         u8 *pos;
3014         bool reassoc;
3015         struct cfg80211_bss *bss;
3016
3017         sdata_assert_lock(sdata);
3018
3019         if (!assoc_data)
3020                 return;
3021         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3022                 return;
3023
3024         /*
3025          * AssocResp and ReassocResp have identical structure, so process both
3026          * of them in this function.
3027          */
3028
3029         if (len < 24 + 6)
3030                 return;
3031
3032         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3033         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3034         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3035         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3036
3037         sdata_info(sdata,
3038                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3039                    reassoc ? "Rea" : "A", mgmt->sa,
3040                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3041
3042         pos = mgmt->u.assoc_resp.variable;
3043         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3044
3045         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3046             elems.timeout_int &&
3047             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3048                 u32 tu, ms;
3049                 tu = le32_to_cpu(elems.timeout_int->value);
3050                 ms = tu * 1024 / 1000;
3051                 sdata_info(sdata,
3052                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3053                            mgmt->sa, tu, ms);
3054                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3055                 assoc_data->timeout_started = true;
3056                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3057                         run_again(sdata, assoc_data->timeout);
3058                 return;
3059         }
3060
3061         bss = assoc_data->bss;
3062
3063         if (status_code != WLAN_STATUS_SUCCESS) {
3064                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3065                            mgmt->sa, status_code);
3066                 ieee80211_destroy_assoc_data(sdata, false);
3067         } else {
3068                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3069                         /* oops -- internal error -- send timeout for now */
3070                         ieee80211_destroy_assoc_data(sdata, false);
3071                         cfg80211_assoc_timeout(sdata->dev, bss);
3072                         return;
3073                 }
3074                 sdata_info(sdata, "associated\n");
3075
3076                 /*
3077                  * destroy assoc_data afterwards, as otherwise an idle
3078                  * recalc after assoc_data is NULL but before associated
3079                  * is set can cause the interface to go idle
3080                  */
3081                 ieee80211_destroy_assoc_data(sdata, true);
3082
3083                 /* get uapsd queues configuration */
3084                 uapsd_queues = 0;
3085                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3086                         if (sdata->tx_conf[ac].uapsd)
3087                                 uapsd_queues |= BIT(ac);
3088         }
3089
3090         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3091 }
3092
3093 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3094                                   struct ieee80211_mgmt *mgmt, size_t len,
3095                                   struct ieee80211_rx_status *rx_status,
3096                                   struct ieee802_11_elems *elems)
3097 {
3098         struct ieee80211_local *local = sdata->local;
3099         struct ieee80211_bss *bss;
3100         struct ieee80211_channel *channel;
3101
3102         sdata_assert_lock(sdata);
3103
3104         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3105         if (!channel)
3106                 return;
3107
3108         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3109                                         channel);
3110         if (bss) {
3111                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3112                 ieee80211_rx_bss_put(local, bss);
3113         }
3114 }
3115
3116
3117 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3118                                          struct sk_buff *skb)
3119 {
3120         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3121         struct ieee80211_if_managed *ifmgd;
3122         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3123         size_t baselen, len = skb->len;
3124         struct ieee802_11_elems elems;
3125
3126         ifmgd = &sdata->u.mgd;
3127
3128         sdata_assert_lock(sdata);
3129
3130         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3131                 return; /* ignore ProbeResp to foreign address */
3132
3133         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3134         if (baselen > len)
3135                 return;
3136
3137         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3138                                false, &elems);
3139
3140         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3141
3142         if (ifmgd->associated &&
3143             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3144                 ieee80211_reset_ap_probe(sdata);
3145
3146         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3147             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3148                 /* got probe response, continue with auth */
3149                 sdata_info(sdata, "direct probe responded\n");
3150                 ifmgd->auth_data->tries = 0;
3151                 ifmgd->auth_data->timeout = jiffies;
3152                 ifmgd->auth_data->timeout_started = true;
3153                 run_again(sdata, ifmgd->auth_data->timeout);
3154         }
3155 }
3156
3157 /*
3158  * This is the canonical list of information elements we care about,
3159  * the filter code also gives us all changes to the Microsoft OUI
3160  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3161  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3162  * changes to requested client power.
3163  *
3164  * We implement beacon filtering in software since that means we can
3165  * avoid processing the frame here and in cfg80211, and userspace
3166  * will not be able to tell whether the hardware supports it or not.
3167  *
3168  * XXX: This list needs to be dynamic -- userspace needs to be able to
3169  *      add items it requires. It also needs to be able to tell us to
3170  *      look out for other vendor IEs.
3171  */
3172 static const u64 care_about_ies =
3173         (1ULL << WLAN_EID_COUNTRY) |
3174         (1ULL << WLAN_EID_ERP_INFO) |
3175         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3176         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3177         (1ULL << WLAN_EID_HT_CAPABILITY) |
3178         (1ULL << WLAN_EID_HT_OPERATION);
3179
3180 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3181                                      struct ieee80211_mgmt *mgmt, size_t len,
3182                                      struct ieee80211_rx_status *rx_status)
3183 {
3184         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3185         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3186         size_t baselen;
3187         struct ieee802_11_elems elems;
3188         struct ieee80211_local *local = sdata->local;
3189         struct ieee80211_chanctx_conf *chanctx_conf;
3190         struct ieee80211_channel *chan;
3191         struct sta_info *sta;
3192         u32 changed = 0;
3193         bool erp_valid;
3194         u8 erp_value = 0;
3195         u32 ncrc;
3196         u8 *bssid;
3197         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3198
3199         sdata_assert_lock(sdata);
3200
3201         /* Process beacon from the current BSS */
3202         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3203         if (baselen > len)
3204                 return;
3205
3206         rcu_read_lock();
3207         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3208         if (!chanctx_conf) {
3209                 rcu_read_unlock();
3210                 return;
3211         }
3212
3213         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3214                 rcu_read_unlock();
3215                 return;
3216         }
3217         chan = chanctx_conf->def.chan;
3218         rcu_read_unlock();
3219
3220         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3221             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3222                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3223                                        len - baselen, false, &elems);
3224
3225                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3226                 if (elems.tim && !elems.parse_error) {
3227                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3228                         ifmgd->dtim_period = tim_ie->dtim_period;
3229                 }
3230                 ifmgd->have_beacon = true;
3231                 ifmgd->assoc_data->need_beacon = false;
3232                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3233                         sdata->vif.bss_conf.sync_tsf =
3234                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3235                         sdata->vif.bss_conf.sync_device_ts =
3236                                 rx_status->device_timestamp;
3237                         if (elems.tim)
3238                                 sdata->vif.bss_conf.sync_dtim_count =
3239                                         elems.tim->dtim_count;
3240                         else
3241                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3242                 }
3243                 /* continue assoc process */
3244                 ifmgd->assoc_data->timeout = jiffies;
3245                 ifmgd->assoc_data->timeout_started = true;
3246                 run_again(sdata, ifmgd->assoc_data->timeout);
3247                 return;
3248         }
3249
3250         if (!ifmgd->associated ||
3251             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3252                 return;
3253         bssid = ifmgd->associated->bssid;
3254
3255         /* Track average RSSI from the Beacon frames of the current AP */
3256         ifmgd->last_beacon_signal = rx_status->signal;
3257         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3258                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3259                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3260                 ifmgd->last_cqm_event_signal = 0;
3261                 ifmgd->count_beacon_signal = 1;
3262                 ifmgd->last_ave_beacon_signal = 0;
3263         } else {
3264                 ifmgd->ave_beacon_signal =
3265                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3266                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3267                          ifmgd->ave_beacon_signal) / 16;
3268                 ifmgd->count_beacon_signal++;
3269         }
3270
3271         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3272             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3273                 int sig = ifmgd->ave_beacon_signal;
3274                 int last_sig = ifmgd->last_ave_beacon_signal;
3275
3276                 /*
3277                  * if signal crosses either of the boundaries, invoke callback
3278                  * with appropriate parameters
3279                  */
3280                 if (sig > ifmgd->rssi_max_thold &&
3281                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3282                         ifmgd->last_ave_beacon_signal = sig;
3283                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3284                 } else if (sig < ifmgd->rssi_min_thold &&
3285                            (last_sig >= ifmgd->rssi_max_thold ||
3286                            last_sig == 0)) {
3287                         ifmgd->last_ave_beacon_signal = sig;
3288                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3289                 }
3290         }
3291
3292         if (bss_conf->cqm_rssi_thold &&
3293             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3294             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3295                 int sig = ifmgd->ave_beacon_signal / 16;
3296                 int last_event = ifmgd->last_cqm_event_signal;
3297                 int thold = bss_conf->cqm_rssi_thold;
3298                 int hyst = bss_conf->cqm_rssi_hyst;
3299                 if (sig < thold &&
3300                     (last_event == 0 || sig < last_event - hyst)) {
3301                         ifmgd->last_cqm_event_signal = sig;
3302                         ieee80211_cqm_rssi_notify(
3303                                 &sdata->vif,
3304                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3305                                 GFP_KERNEL);
3306                 } else if (sig > thold &&
3307                            (last_event == 0 || sig > last_event + hyst)) {
3308                         ifmgd->last_cqm_event_signal = sig;
3309                         ieee80211_cqm_rssi_notify(
3310                                 &sdata->vif,
3311                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3312                                 GFP_KERNEL);
3313                 }
3314         }
3315
3316         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3317                 mlme_dbg_ratelimited(sdata,
3318                                      "cancelling AP probe due to a received beacon\n");
3319                 ieee80211_reset_ap_probe(sdata);
3320         }
3321
3322         /*
3323          * Push the beacon loss detection into the future since
3324          * we are processing a beacon from the AP just now.
3325          */
3326         ieee80211_sta_reset_beacon_monitor(sdata);
3327
3328         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3329         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3330                                           len - baselen, false, &elems,
3331                                           care_about_ies, ncrc);
3332
3333         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3334                 bool directed_tim = ieee80211_check_tim(elems.tim,
3335                                                         elems.tim_len,
3336                                                         ifmgd->aid);
3337                 if (directed_tim) {
3338                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3339                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3340                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3341                                         ieee80211_hw_config(local,
3342                                                             IEEE80211_CONF_CHANGE_PS);
3343                                 }
3344                                 ieee80211_send_nullfunc(local, sdata, 0);
3345                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3346                                 local->pspolling = true;
3347
3348                                 /*
3349                                  * Here is assumed that the driver will be
3350                                  * able to send ps-poll frame and receive a
3351                                  * response even though power save mode is
3352                                  * enabled, but some drivers might require
3353                                  * to disable power save here. This needs
3354                                  * to be investigated.
3355                                  */
3356                                 ieee80211_send_pspoll(local, sdata);
3357                         }
3358                 }
3359         }
3360
3361         if (sdata->vif.p2p) {
3362                 struct ieee80211_p2p_noa_attr noa = {};
3363                 int ret;
3364
3365                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3366                                             len - baselen,
3367                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3368                                             (u8 *) &noa, sizeof(noa));
3369                 if (ret >= 2) {
3370                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3371                                 /* valid noa_attr and index changed */
3372                                 sdata->u.mgd.p2p_noa_index = noa.index;
3373                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3374                                 changed |= BSS_CHANGED_P2P_PS;
3375                                 /*
3376                                  * make sure we update all information, the CRC
3377                                  * mechanism doesn't look at P2P attributes.
3378                                  */
3379                                 ifmgd->beacon_crc_valid = false;
3380                         }
3381                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3382                         /* noa_attr not found and we had valid noa_attr before */
3383                         sdata->u.mgd.p2p_noa_index = -1;
3384                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3385                         changed |= BSS_CHANGED_P2P_PS;
3386                         ifmgd->beacon_crc_valid = false;
3387                 }
3388         }
3389
3390         if (ifmgd->csa_waiting_bcn)
3391                 ieee80211_chswitch_post_beacon(sdata);
3392
3393         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3394                 return;
3395         ifmgd->beacon_crc = ncrc;
3396         ifmgd->beacon_crc_valid = true;
3397
3398         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3399
3400         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3401                                          rx_status->device_timestamp,
3402                                          &elems, true);
3403
3404         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3405             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3406                                      elems.wmm_param_len))
3407                 changed |= BSS_CHANGED_QOS;
3408
3409         /*
3410          * If we haven't had a beacon before, tell the driver about the
3411          * DTIM period (and beacon timing if desired) now.
3412          */
3413         if (!ifmgd->have_beacon) {
3414                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3415                 if (elems.tim)
3416                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3417                 else
3418                         bss_conf->dtim_period = 1;
3419
3420                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3421                         sdata->vif.bss_conf.sync_tsf =
3422                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3423                         sdata->vif.bss_conf.sync_device_ts =
3424                                 rx_status->device_timestamp;
3425                         if (elems.tim)
3426                                 sdata->vif.bss_conf.sync_dtim_count =
3427                                         elems.tim->dtim_count;
3428                         else
3429                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3430                 }
3431
3432                 changed |= BSS_CHANGED_BEACON_INFO;
3433                 ifmgd->have_beacon = true;
3434
3435                 mutex_lock(&local->iflist_mtx);
3436                 ieee80211_recalc_ps(local, -1);
3437                 mutex_unlock(&local->iflist_mtx);
3438
3439                 ieee80211_recalc_ps_vif(sdata);
3440         }
3441
3442         if (elems.erp_info) {
3443                 erp_valid = true;
3444                 erp_value = elems.erp_info[0];
3445         } else {
3446                 erp_valid = false;
3447         }
3448         changed |= ieee80211_handle_bss_capability(sdata,
3449                         le16_to_cpu(mgmt->u.beacon.capab_info),
3450                         erp_valid, erp_value);
3451
3452         mutex_lock(&local->sta_mtx);
3453         sta = sta_info_get(sdata, bssid);
3454
3455         if (ieee80211_config_bw(sdata, sta,
3456                                 elems.ht_cap_elem, elems.ht_operation,
3457                                 elems.vht_operation, bssid, &changed)) {
3458                 mutex_unlock(&local->sta_mtx);
3459                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3460                                        WLAN_REASON_DEAUTH_LEAVING,
3461                                        true, deauth_buf);
3462                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3463                                       sizeof(deauth_buf));
3464                 return;
3465         }
3466
3467         if (sta && elems.opmode_notif)
3468                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3469                                             rx_status->band, true);
3470         mutex_unlock(&local->sta_mtx);
3471
3472         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3473                                                elems.country_elem,
3474                                                elems.country_elem_len,
3475                                                elems.pwr_constr_elem,
3476                                                elems.cisco_dtpc_elem);
3477
3478         ieee80211_bss_info_change_notify(sdata, changed);
3479 }
3480
3481 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3482                                   struct sk_buff *skb)
3483 {
3484         struct ieee80211_rx_status *rx_status;
3485         struct ieee80211_mgmt *mgmt;
3486         u16 fc;
3487         struct ieee802_11_elems elems;
3488         int ies_len;
3489
3490         rx_status = (struct ieee80211_rx_status *) skb->cb;
3491         mgmt = (struct ieee80211_mgmt *) skb->data;
3492         fc = le16_to_cpu(mgmt->frame_control);
3493
3494         sdata_lock(sdata);
3495
3496         switch (fc & IEEE80211_FCTL_STYPE) {
3497         case IEEE80211_STYPE_BEACON:
3498                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3499                 break;
3500         case IEEE80211_STYPE_PROBE_RESP:
3501                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3502                 break;
3503         case IEEE80211_STYPE_AUTH:
3504                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3505                 break;
3506         case IEEE80211_STYPE_DEAUTH:
3507                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3508                 break;
3509         case IEEE80211_STYPE_DISASSOC:
3510                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3511                 break;
3512         case IEEE80211_STYPE_ASSOC_RESP:
3513         case IEEE80211_STYPE_REASSOC_RESP:
3514                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3515                 break;
3516         case IEEE80211_STYPE_ACTION:
3517                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3518                         ies_len = skb->len -
3519                                   offsetof(struct ieee80211_mgmt,
3520                                            u.action.u.chan_switch.variable);
3521
3522                         if (ies_len < 0)
3523                                 break;
3524
3525                         ieee802_11_parse_elems(
3526                                 mgmt->u.action.u.chan_switch.variable,
3527                                 ies_len, true, &elems);
3528
3529                         if (elems.parse_error)
3530                                 break;
3531
3532                         ieee80211_sta_process_chanswitch(sdata,
3533                                                  rx_status->mactime,
3534                                                  rx_status->device_timestamp,
3535                                                  &elems, false);
3536                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3537                         ies_len = skb->len -
3538                                   offsetof(struct ieee80211_mgmt,
3539                                            u.action.u.ext_chan_switch.variable);
3540
3541                         if (ies_len < 0)
3542                                 break;
3543
3544                         ieee802_11_parse_elems(
3545                                 mgmt->u.action.u.ext_chan_switch.variable,
3546                                 ies_len, true, &elems);
3547
3548                         if (elems.parse_error)
3549                                 break;
3550
3551                         /* for the handling code pretend this was also an IE */
3552                         elems.ext_chansw_ie =
3553                                 &mgmt->u.action.u.ext_chan_switch.data;
3554
3555                         ieee80211_sta_process_chanswitch(sdata,
3556                                                  rx_status->mactime,
3557                                                  rx_status->device_timestamp,
3558                                                  &elems, false);
3559                 }
3560                 break;
3561         }
3562         sdata_unlock(sdata);
3563 }
3564
3565 static void ieee80211_sta_timer(unsigned long data)
3566 {
3567         struct ieee80211_sub_if_data *sdata =
3568                 (struct ieee80211_sub_if_data *) data;
3569
3570         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3571 }
3572
3573 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3574                                           u8 *bssid, u8 reason, bool tx)
3575 {
3576         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3577
3578         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3579                                tx, frame_buf);
3580
3581         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3582                               IEEE80211_DEAUTH_FRAME_LEN);
3583 }
3584
3585 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3586 {
3587         struct ieee80211_local *local = sdata->local;
3588         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3589         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3590         u32 tx_flags = 0;
3591
3592         sdata_assert_lock(sdata);
3593
3594         if (WARN_ON_ONCE(!auth_data))
3595                 return -EINVAL;
3596
3597         auth_data->tries++;
3598
3599         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3600                 sdata_info(sdata, "authentication with %pM timed out\n",
3601                            auth_data->bss->bssid);
3602
3603                 /*
3604                  * Most likely AP is not in the range so remove the
3605                  * bss struct for that AP.
3606                  */
3607                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3608
3609                 return -ETIMEDOUT;
3610         }
3611
3612         drv_mgd_prepare_tx(local, sdata);
3613
3614         if (auth_data->bss->proberesp_ies) {
3615                 u16 trans = 1;
3616                 u16 status = 0;
3617
3618                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3619                            auth_data->bss->bssid, auth_data->tries,
3620                            IEEE80211_AUTH_MAX_TRIES);
3621
3622                 auth_data->expected_transaction = 2;
3623
3624                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3625                         trans = auth_data->sae_trans;
3626                         status = auth_data->sae_status;
3627                         auth_data->expected_transaction = trans;
3628                 }
3629
3630                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3631                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3632                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3633
3634                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3635                                     auth_data->data, auth_data->data_len,
3636                                     auth_data->bss->bssid,
3637                                     auth_data->bss->bssid, NULL, 0, 0,
3638                                     tx_flags);
3639         } else {
3640                 const u8 *ssidie;
3641
3642                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3643                            auth_data->bss->bssid, auth_data->tries,
3644                            IEEE80211_AUTH_MAX_TRIES);
3645
3646                 rcu_read_lock();
3647                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3648                 if (!ssidie) {
3649                         rcu_read_unlock();
3650                         return -EINVAL;
3651                 }
3652                 /*
3653                  * Direct probe is sent to broadcast address as some APs
3654                  * will not answer to direct packet in unassociated state.
3655                  */
3656                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
3657                                          ssidie + 2, ssidie[1],
3658                                          NULL, 0, (u32) -1, true, 0,
3659                                          auth_data->bss->channel, false);
3660                 rcu_read_unlock();
3661         }
3662
3663         if (tx_flags == 0) {
3664                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3665                 auth_data->timeout_started = true;
3666                 run_again(sdata, auth_data->timeout);
3667         } else {
3668                 auth_data->timeout =
3669                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3670                 auth_data->timeout_started = true;
3671                 run_again(sdata, auth_data->timeout);
3672         }
3673
3674         return 0;
3675 }
3676
3677 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3678 {
3679         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3680         struct ieee80211_local *local = sdata->local;
3681
3682         sdata_assert_lock(sdata);
3683
3684         assoc_data->tries++;
3685         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3686                 sdata_info(sdata, "association with %pM timed out\n",
3687                            assoc_data->bss->bssid);
3688
3689                 /*
3690                  * Most likely AP is not in the range so remove the
3691                  * bss struct for that AP.
3692                  */
3693                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3694
3695                 return -ETIMEDOUT;
3696         }
3697
3698         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3699                    assoc_data->bss->bssid, assoc_data->tries,
3700                    IEEE80211_ASSOC_MAX_TRIES);
3701         ieee80211_send_assoc(sdata);
3702
3703         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3704                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3705                 assoc_data->timeout_started = true;
3706                 run_again(sdata, assoc_data->timeout);
3707         } else {
3708                 assoc_data->timeout =
3709                         round_jiffies_up(jiffies +
3710                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3711                 assoc_data->timeout_started = true;
3712                 run_again(sdata, assoc_data->timeout);
3713         }
3714
3715         return 0;
3716 }
3717
3718 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3719                                   __le16 fc, bool acked)
3720 {
3721         struct ieee80211_local *local = sdata->local;
3722
3723         sdata->u.mgd.status_fc = fc;
3724         sdata->u.mgd.status_acked = acked;
3725         sdata->u.mgd.status_received = true;
3726
3727         ieee80211_queue_work(&local->hw, &sdata->work);
3728 }
3729
3730 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3731 {
3732         struct ieee80211_local *local = sdata->local;
3733         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3734
3735         sdata_lock(sdata);
3736
3737         if (ifmgd->status_received) {
3738                 __le16 fc = ifmgd->status_fc;
3739                 bool status_acked = ifmgd->status_acked;
3740
3741                 ifmgd->status_received = false;
3742                 if (ifmgd->auth_data &&
3743                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3744                         if (status_acked) {
3745                                 ifmgd->auth_data->timeout =
3746                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3747                                 run_again(sdata, ifmgd->auth_data->timeout);
3748                         } else {
3749                                 ifmgd->auth_data->timeout = jiffies - 1;
3750                         }
3751                         ifmgd->auth_data->timeout_started = true;
3752                 } else if (ifmgd->assoc_data &&
3753                            (ieee80211_is_assoc_req(fc) ||
3754                             ieee80211_is_reassoc_req(fc))) {
3755                         if (status_acked) {
3756                                 ifmgd->assoc_data->timeout =
3757                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3758                                 run_again(sdata, ifmgd->assoc_data->timeout);
3759                         } else {
3760                                 ifmgd->assoc_data->timeout = jiffies - 1;
3761                         }
3762                         ifmgd->assoc_data->timeout_started = true;
3763                 }
3764         }
3765
3766         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3767             time_after(jiffies, ifmgd->auth_data->timeout)) {
3768                 if (ifmgd->auth_data->done) {
3769                         /*
3770                          * ok ... we waited for assoc but userspace didn't,
3771                          * so let's just kill the auth data
3772                          */
3773                         ieee80211_destroy_auth_data(sdata, false);
3774                 } else if (ieee80211_probe_auth(sdata)) {
3775                         u8 bssid[ETH_ALEN];
3776
3777                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3778
3779                         ieee80211_destroy_auth_data(sdata, false);
3780
3781                         cfg80211_auth_timeout(sdata->dev, bssid);
3782                 }
3783         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3784                 run_again(sdata, ifmgd->auth_data->timeout);
3785
3786         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3787             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3788                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3789                     ieee80211_do_assoc(sdata)) {
3790                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3791
3792                         ieee80211_destroy_assoc_data(sdata, false);
3793                         cfg80211_assoc_timeout(sdata->dev, bss);
3794                 }
3795         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3796                 run_again(sdata, ifmgd->assoc_data->timeout);
3797
3798         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3799             ifmgd->associated) {
3800                 u8 bssid[ETH_ALEN];
3801                 int max_tries;
3802
3803                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3804
3805                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3806                         max_tries = max_nullfunc_tries;
3807                 else
3808                         max_tries = max_probe_tries;
3809
3810                 /* ACK received for nullfunc probing frame */
3811                 if (!ifmgd->probe_send_count)
3812                         ieee80211_reset_ap_probe(sdata);
3813                 else if (ifmgd->nullfunc_failed) {
3814                         if (ifmgd->probe_send_count < max_tries) {
3815                                 mlme_dbg(sdata,
3816                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3817                                          bssid, ifmgd->probe_send_count,
3818                                          max_tries);
3819                                 ieee80211_mgd_probe_ap_send(sdata);
3820                         } else {
3821                                 mlme_dbg(sdata,
3822                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3823                                          bssid);
3824                                 ieee80211_sta_connection_lost(sdata, bssid,
3825                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3826                                         false);
3827                         }
3828                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3829                         run_again(sdata, ifmgd->probe_timeout);
3830                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3831                         mlme_dbg(sdata,
3832                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3833                                  bssid, probe_wait_ms);
3834                         ieee80211_sta_connection_lost(sdata, bssid,
3835                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3836                 } else if (ifmgd->probe_send_count < max_tries) {
3837                         mlme_dbg(sdata,
3838                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3839                                  bssid, probe_wait_ms,
3840                                  ifmgd->probe_send_count, max_tries);
3841                         ieee80211_mgd_probe_ap_send(sdata);
3842                 } else {
3843                         /*
3844                          * We actually lost the connection ... or did we?
3845                          * Let's make sure!
3846                          */
3847                         wiphy_debug(local->hw.wiphy,
3848                                     "%s: No probe response from AP %pM"
3849                                     " after %dms, disconnecting.\n",
3850                                     sdata->name,
3851                                     bssid, probe_wait_ms);
3852
3853                         ieee80211_sta_connection_lost(sdata, bssid,
3854                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3855                 }
3856         }
3857
3858         sdata_unlock(sdata);
3859 }
3860
3861 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3862 {
3863         struct ieee80211_sub_if_data *sdata =
3864                 (struct ieee80211_sub_if_data *) data;
3865         struct ieee80211_local *local = sdata->local;
3866         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3867
3868         if (local->quiescing)
3869                 return;
3870
3871         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3872                 return;
3873
3874         sdata->u.mgd.connection_loss = false;
3875         ieee80211_queue_work(&sdata->local->hw,
3876                              &sdata->u.mgd.beacon_connection_loss_work);
3877 }
3878
3879 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3880 {
3881         struct ieee80211_sub_if_data *sdata =
3882                 (struct ieee80211_sub_if_data *) data;
3883         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3884         struct ieee80211_local *local = sdata->local;
3885
3886         if (local->quiescing)
3887                 return;
3888
3889         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3890                 return;
3891
3892         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3893 }
3894
3895 static void ieee80211_sta_monitor_work(struct work_struct *work)
3896 {
3897         struct ieee80211_sub_if_data *sdata =
3898                 container_of(work, struct ieee80211_sub_if_data,
3899                              u.mgd.monitor_work);
3900
3901         ieee80211_mgd_probe_ap(sdata, false);
3902 }
3903
3904 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3905 {
3906         u32 flags;
3907
3908         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3909                 __ieee80211_stop_poll(sdata);
3910
3911                 /* let's probe the connection once */
3912                 flags = sdata->local->hw.flags;
3913                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3914                         ieee80211_queue_work(&sdata->local->hw,
3915                                              &sdata->u.mgd.monitor_work);
3916                 /* and do all the other regular work too */
3917                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3918         }
3919 }
3920
3921 #ifdef CONFIG_PM
3922 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3923 {
3924         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3925         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3926
3927         sdata_lock(sdata);
3928
3929         if (ifmgd->auth_data || ifmgd->assoc_data) {
3930                 const u8 *bssid = ifmgd->auth_data ?
3931                                 ifmgd->auth_data->bss->bssid :
3932                                 ifmgd->assoc_data->bss->bssid;
3933
3934                 /*
3935                  * If we are trying to authenticate / associate while suspending,
3936                  * cfg80211 won't know and won't actually abort those attempts,
3937                  * thus we need to do that ourselves.
3938                  */
3939                 ieee80211_send_deauth_disassoc(sdata, bssid,
3940                                                IEEE80211_STYPE_DEAUTH,
3941                                                WLAN_REASON_DEAUTH_LEAVING,
3942                                                false, frame_buf);
3943                 if (ifmgd->assoc_data)
3944                         ieee80211_destroy_assoc_data(sdata, false);
3945                 if (ifmgd->auth_data)
3946                         ieee80211_destroy_auth_data(sdata, false);
3947                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3948                                       IEEE80211_DEAUTH_FRAME_LEN);
3949         }
3950
3951         sdata_unlock(sdata);
3952 }
3953
3954 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3955 {
3956         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3957
3958         sdata_lock(sdata);
3959         if (!ifmgd->associated) {
3960                 sdata_unlock(sdata);
3961                 return;
3962         }
3963
3964         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3965                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3966                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3967                 ieee80211_sta_connection_lost(sdata,
3968                                               ifmgd->associated->bssid,
3969                                               WLAN_REASON_UNSPECIFIED,
3970                                               true);
3971                 sdata_unlock(sdata);
3972                 return;
3973         }
3974         sdata_unlock(sdata);
3975 }
3976 #endif
3977
3978 /* interface setup */
3979 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3980 {
3981         struct ieee80211_if_managed *ifmgd;
3982
3983         ifmgd = &sdata->u.mgd;
3984         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3985         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3986         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3987                   ieee80211_beacon_connection_loss_work);
3988         INIT_WORK(&ifmgd->csa_connection_drop_work,
3989                   ieee80211_csa_connection_drop_work);
3990         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3991         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
3992                           ieee80211_tdls_peer_del_work);
3993         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3994                     (unsigned long) sdata);
3995         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3996                     (unsigned long) sdata);
3997         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3998                     (unsigned long) sdata);
3999         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4000                     (unsigned long) sdata);
4001         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4002                           ieee80211_sta_handle_tspec_ac_params_wk);
4003
4004         ifmgd->flags = 0;
4005         ifmgd->powersave = sdata->wdev.ps;
4006         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4007         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4008         ifmgd->p2p_noa_index = -1;
4009
4010         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4011                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4012         else
4013                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4014
4015         /* Setup TDLS data */
4016         spin_lock_init(&ifmgd->teardown_lock);
4017         ifmgd->teardown_skb = NULL;
4018         ifmgd->orig_teardown_skb = NULL;
4019 }
4020
4021 /* scan finished notification */
4022 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4023 {
4024         struct ieee80211_sub_if_data *sdata;
4025
4026         /* Restart STA timers */
4027         rcu_read_lock();
4028         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4029                 if (ieee80211_sdata_running(sdata))
4030                         ieee80211_restart_sta_timer(sdata);
4031         }
4032         rcu_read_unlock();
4033 }
4034
4035 int ieee80211_max_network_latency(struct notifier_block *nb,
4036                                   unsigned long data, void *dummy)
4037 {
4038         s32 latency_usec = (s32) data;
4039         struct ieee80211_local *local =
4040                 container_of(nb, struct ieee80211_local,
4041                              network_latency_notifier);
4042
4043         mutex_lock(&local->iflist_mtx);
4044         ieee80211_recalc_ps(local, latency_usec);
4045         mutex_unlock(&local->iflist_mtx);
4046
4047         return NOTIFY_OK;
4048 }
4049
4050 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4051                                      struct cfg80211_bss *cbss)
4052 {
4053         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4054         const u8 *ht_cap_ie, *vht_cap_ie;
4055         const struct ieee80211_ht_cap *ht_cap;
4056         const struct ieee80211_vht_cap *vht_cap;
4057         u8 chains = 1;
4058
4059         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4060                 return chains;
4061
4062         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4063         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4064                 ht_cap = (void *)(ht_cap_ie + 2);
4065                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4066                 /*
4067                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4068                  *       "Tx Unequal Modulation Supported" fields.
4069                  */
4070         }
4071
4072         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4073                 return chains;
4074
4075         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4076         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4077                 u8 nss;
4078                 u16 tx_mcs_map;
4079
4080                 vht_cap = (void *)(vht_cap_ie + 2);
4081                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4082                 for (nss = 8; nss > 0; nss--) {
4083                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4084                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4085                                 break;
4086                 }
4087                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4088                 chains = max(chains, nss);
4089         }
4090
4091         return chains;
4092 }
4093
4094 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4095                                   struct cfg80211_bss *cbss)
4096 {
4097         struct ieee80211_local *local = sdata->local;
4098         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4099         const struct ieee80211_ht_cap *ht_cap = NULL;
4100         const struct ieee80211_ht_operation *ht_oper = NULL;
4101         const struct ieee80211_vht_operation *vht_oper = NULL;
4102         struct ieee80211_supported_band *sband;
4103         struct cfg80211_chan_def chandef;
4104         int ret;
4105
4106         sband = local->hw.wiphy->bands[cbss->channel->band];
4107
4108         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4109                           IEEE80211_STA_DISABLE_80P80MHZ |
4110                           IEEE80211_STA_DISABLE_160MHZ);
4111
4112         rcu_read_lock();
4113
4114         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4115             sband->ht_cap.ht_supported) {
4116                 const u8 *ht_oper_ie, *ht_cap_ie;
4117
4118                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4119                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4120                         ht_oper = (void *)(ht_oper_ie + 2);
4121
4122                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4123                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4124                         ht_cap = (void *)(ht_cap_ie + 2);
4125
4126                 if (!ht_cap) {
4127                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4128                         ht_oper = NULL;
4129                 }
4130         }
4131
4132         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4133             sband->vht_cap.vht_supported) {
4134                 const u8 *vht_oper_ie, *vht_cap;
4135
4136                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4137                                                    WLAN_EID_VHT_OPERATION);
4138                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4139                         vht_oper = (void *)(vht_oper_ie + 2);
4140                 if (vht_oper && !ht_oper) {
4141                         vht_oper = NULL;
4142                         sdata_info(sdata,
4143                                    "AP advertised VHT without HT, disabling both\n");
4144                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4145                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4146                 }
4147
4148                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4149                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4150                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4151                         vht_oper = NULL;
4152                 }
4153         }
4154
4155         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4156                                                      cbss->channel,
4157                                                      ht_cap, ht_oper, vht_oper,
4158                                                      &chandef, false);
4159
4160         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4161                                       local->rx_chains);
4162
4163         rcu_read_unlock();
4164
4165         /* will change later if needed */
4166         sdata->smps_mode = IEEE80211_SMPS_OFF;
4167
4168         mutex_lock(&local->mtx);
4169         /*
4170          * If this fails (possibly due to channel context sharing
4171          * on incompatible channels, e.g. 80+80 and 160 sharing the
4172          * same control channel) try to use a smaller bandwidth.
4173          */
4174         ret = ieee80211_vif_use_channel(sdata, &chandef,
4175                                         IEEE80211_CHANCTX_SHARED);
4176
4177         /* don't downgrade for 5 and 10 MHz channels, though. */
4178         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4179             chandef.width == NL80211_CHAN_WIDTH_10)
4180                 goto out;
4181
4182         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4183                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4184                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4185                                                 IEEE80211_CHANCTX_SHARED);
4186         }
4187  out:
4188         mutex_unlock(&local->mtx);
4189         return ret;
4190 }
4191
4192 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4193                                      struct cfg80211_bss *cbss, bool assoc)
4194 {
4195         struct ieee80211_local *local = sdata->local;
4196         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4197         struct ieee80211_bss *bss = (void *)cbss->priv;
4198         struct sta_info *new_sta = NULL;
4199         bool have_sta = false;
4200         int err;
4201
4202         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4203                 return -EINVAL;
4204
4205         if (assoc) {
4206                 rcu_read_lock();
4207                 have_sta = sta_info_get(sdata, cbss->bssid);
4208                 rcu_read_unlock();
4209         }
4210
4211         if (!have_sta) {
4212                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4213                 if (!new_sta)
4214                         return -ENOMEM;
4215         }
4216         if (new_sta) {
4217                 u32 rates = 0, basic_rates = 0;
4218                 bool have_higher_than_11mbit;
4219                 int min_rate = INT_MAX, min_rate_index = -1;
4220                 struct ieee80211_chanctx_conf *chanctx_conf;
4221                 struct ieee80211_supported_band *sband;
4222                 const struct cfg80211_bss_ies *ies;
4223                 int shift;
4224                 u32 rate_flags;
4225
4226                 sband = local->hw.wiphy->bands[cbss->channel->band];
4227
4228                 err = ieee80211_prep_channel(sdata, cbss);
4229                 if (err) {
4230                         sta_info_free(local, new_sta);
4231                         return -EINVAL;
4232                 }
4233                 shift = ieee80211_vif_get_shift(&sdata->vif);
4234
4235                 rcu_read_lock();
4236                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4237                 if (WARN_ON(!chanctx_conf)) {
4238                         rcu_read_unlock();
4239                         sta_info_free(local, new_sta);
4240                         return -EINVAL;
4241                 }
4242                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4243                 rcu_read_unlock();
4244
4245                 ieee80211_get_rates(sband, bss->supp_rates,
4246                                     bss->supp_rates_len,
4247                                     &rates, &basic_rates,
4248                                     &have_higher_than_11mbit,
4249                                     &min_rate, &min_rate_index,
4250                                     shift, rate_flags);
4251
4252                 /*
4253                  * This used to be a workaround for basic rates missing
4254                  * in the association response frame. Now that we no
4255                  * longer use the basic rates from there, it probably
4256                  * doesn't happen any more, but keep the workaround so
4257                  * in case some *other* APs are buggy in different ways
4258                  * we can connect -- with a warning.
4259                  */
4260                 if (!basic_rates && min_rate_index >= 0) {
4261                         sdata_info(sdata,
4262                                    "No basic rates, using min rate instead\n");
4263                         basic_rates = BIT(min_rate_index);
4264                 }
4265
4266                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4267                 sdata->vif.bss_conf.basic_rates = basic_rates;
4268
4269                 /* cf. IEEE 802.11 9.2.12 */
4270                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4271                     have_higher_than_11mbit)
4272                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4273                 else
4274                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4275
4276                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4277
4278                 /* set timing information */
4279                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4280                 rcu_read_lock();
4281                 ies = rcu_dereference(cbss->beacon_ies);
4282                 if (ies) {
4283                         const u8 *tim_ie;
4284
4285                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4286                         sdata->vif.bss_conf.sync_device_ts =
4287                                 bss->device_ts_beacon;
4288                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4289                                                   ies->data, ies->len);
4290                         if (tim_ie && tim_ie[1] >= 2)
4291                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4292                         else
4293                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4294                 } else if (!(local->hw.flags &
4295                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4296                         ies = rcu_dereference(cbss->proberesp_ies);
4297                         /* must be non-NULL since beacon IEs were NULL */
4298                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4299                         sdata->vif.bss_conf.sync_device_ts =
4300                                 bss->device_ts_presp;
4301                         sdata->vif.bss_conf.sync_dtim_count = 0;
4302                 } else {
4303                         sdata->vif.bss_conf.sync_tsf = 0;
4304                         sdata->vif.bss_conf.sync_device_ts = 0;
4305                         sdata->vif.bss_conf.sync_dtim_count = 0;
4306                 }
4307                 rcu_read_unlock();
4308
4309                 /* tell driver about BSSID, basic rates and timing */
4310                 ieee80211_bss_info_change_notify(sdata,
4311                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4312                         BSS_CHANGED_BEACON_INT);
4313
4314                 if (assoc)
4315                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4316
4317                 err = sta_info_insert(new_sta);
4318                 new_sta = NULL;
4319                 if (err) {
4320                         sdata_info(sdata,
4321                                    "failed to insert STA entry for the AP (error %d)\n",
4322                                    err);
4323                         return err;
4324                 }
4325         } else
4326                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4327
4328         return 0;
4329 }
4330
4331 /* config hooks */
4332 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4333                        struct cfg80211_auth_request *req)
4334 {
4335         struct ieee80211_local *local = sdata->local;
4336         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4337         struct ieee80211_mgd_auth_data *auth_data;
4338         u16 auth_alg;
4339         int err;
4340
4341         /* prepare auth data structure */
4342
4343         switch (req->auth_type) {
4344         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4345                 auth_alg = WLAN_AUTH_OPEN;
4346                 break;
4347         case NL80211_AUTHTYPE_SHARED_KEY:
4348                 if (IS_ERR(local->wep_tx_tfm))
4349                         return -EOPNOTSUPP;
4350                 auth_alg = WLAN_AUTH_SHARED_KEY;
4351                 break;
4352         case NL80211_AUTHTYPE_FT:
4353                 auth_alg = WLAN_AUTH_FT;
4354                 break;
4355         case NL80211_AUTHTYPE_NETWORK_EAP:
4356                 auth_alg = WLAN_AUTH_LEAP;
4357                 break;
4358         case NL80211_AUTHTYPE_SAE:
4359                 auth_alg = WLAN_AUTH_SAE;
4360                 break;
4361         default:
4362                 return -EOPNOTSUPP;
4363         }
4364
4365         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4366                             req->ie_len, GFP_KERNEL);
4367         if (!auth_data)
4368                 return -ENOMEM;
4369
4370         auth_data->bss = req->bss;
4371
4372         if (req->sae_data_len >= 4) {
4373                 __le16 *pos = (__le16 *) req->sae_data;
4374                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4375                 auth_data->sae_status = le16_to_cpu(pos[1]);
4376                 memcpy(auth_data->data, req->sae_data + 4,
4377                        req->sae_data_len - 4);
4378                 auth_data->data_len += req->sae_data_len - 4;
4379         }
4380
4381         if (req->ie && req->ie_len) {
4382                 memcpy(&auth_data->data[auth_data->data_len],
4383                        req->ie, req->ie_len);
4384                 auth_data->data_len += req->ie_len;
4385         }
4386
4387         if (req->key && req->key_len) {
4388                 auth_data->key_len = req->key_len;
4389                 auth_data->key_idx = req->key_idx;
4390                 memcpy(auth_data->key, req->key, req->key_len);
4391         }
4392
4393         auth_data->algorithm = auth_alg;
4394
4395         /* try to authenticate/probe */
4396
4397         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4398             ifmgd->assoc_data) {
4399                 err = -EBUSY;
4400                 goto err_free;
4401         }
4402
4403         if (ifmgd->auth_data)
4404                 ieee80211_destroy_auth_data(sdata, false);
4405
4406         /* prep auth_data so we don't go into idle on disassoc */
4407         ifmgd->auth_data = auth_data;
4408
4409         if (ifmgd->associated) {
4410                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4411
4412                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4413                                        WLAN_REASON_UNSPECIFIED,
4414                                        false, frame_buf);
4415
4416                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4417                                       sizeof(frame_buf));
4418         }
4419
4420         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4421
4422         err = ieee80211_prep_connection(sdata, req->bss, false);
4423         if (err)
4424                 goto err_clear;
4425
4426         err = ieee80211_probe_auth(sdata);
4427         if (err) {
4428                 sta_info_destroy_addr(sdata, req->bss->bssid);
4429                 goto err_clear;
4430         }
4431
4432         /* hold our own reference */
4433         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4434         return 0;
4435
4436  err_clear:
4437         memset(ifmgd->bssid, 0, ETH_ALEN);
4438         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4439         ifmgd->auth_data = NULL;
4440  err_free:
4441         kfree(auth_data);
4442         return err;
4443 }
4444
4445 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4446                                         const u8 *wmm_param, int len)
4447 {
4448         const u8 *pos;
4449         size_t left;
4450
4451         if (len < 8)
4452                 return false;
4453
4454         if (wmm_param[5] != 1 /* version */)
4455                 return false;
4456
4457         pos = wmm_param + 8;
4458         left = len - 8;
4459
4460         for (; left >= 4; left -= 4, pos += 4) {
4461                 u8 aifsn = pos[0] & 0x0f;
4462                 u8 ecwmin = pos[1] & 0x0f;
4463                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4464                 int aci = (pos[0] >> 5) & 0x03;
4465
4466                 if (aifsn < 2) {
4467                         sdata_info(sdata,
4468                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4469                                    aifsn, aci);
4470                         return false;
4471                 }
4472                 if (ecwmin > ecwmax) {
4473                         sdata_info(sdata,
4474                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4475                                    ecwmin, ecwmax, aci);
4476                         return false;
4477                 }
4478         }
4479
4480         return true;
4481 }
4482
4483 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4484                         struct cfg80211_assoc_request *req)
4485 {
4486         struct ieee80211_local *local = sdata->local;
4487         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4488         struct ieee80211_bss *bss = (void *)req->bss->priv;
4489         struct ieee80211_mgd_assoc_data *assoc_data;
4490         const struct cfg80211_bss_ies *beacon_ies;
4491         struct ieee80211_supported_band *sband;
4492         const u8 *ssidie, *ht_ie, *vht_ie;
4493         int i, err;
4494
4495         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4496         if (!assoc_data)
4497                 return -ENOMEM;
4498
4499         rcu_read_lock();
4500         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4501         if (!ssidie) {
4502                 rcu_read_unlock();
4503                 kfree(assoc_data);
4504                 return -EINVAL;
4505         }
4506         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4507         assoc_data->ssid_len = ssidie[1];
4508         rcu_read_unlock();
4509
4510         if (ifmgd->associated) {
4511                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4512
4513                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4514                                        WLAN_REASON_UNSPECIFIED,
4515                                        false, frame_buf);
4516
4517                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4518                                       sizeof(frame_buf));
4519         }
4520
4521         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4522                 err = -EBUSY;
4523                 goto err_free;
4524         }
4525
4526         if (ifmgd->assoc_data) {
4527                 err = -EBUSY;
4528                 goto err_free;
4529         }
4530
4531         if (ifmgd->auth_data) {
4532                 bool match;
4533
4534                 /* keep sta info, bssid if matching */
4535                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4536                 ieee80211_destroy_auth_data(sdata, match);
4537         }
4538
4539         /* prepare assoc data */
4540
4541         ifmgd->beacon_crc_valid = false;
4542
4543         assoc_data->wmm = bss->wmm_used &&
4544                           (local->hw.queues >= IEEE80211_NUM_ACS);
4545         if (assoc_data->wmm) {
4546                 /* try to check validity of WMM params IE */
4547                 const struct cfg80211_bss_ies *ies;
4548                 const u8 *wp, *start, *end;
4549
4550                 rcu_read_lock();
4551                 ies = rcu_dereference(req->bss->ies);
4552                 start = ies->data;
4553                 end = start + ies->len;
4554
4555                 while (true) {
4556                         wp = cfg80211_find_vendor_ie(
4557                                 WLAN_OUI_MICROSOFT,
4558                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4559                                 start, end - start);
4560                         if (!wp)
4561                                 break;
4562                         start = wp + wp[1] + 2;
4563                         /* if this IE is too short, try the next */
4564                         if (wp[1] <= 4)
4565                                 continue;
4566                         /* if this IE is WMM params, we found what we wanted */
4567                         if (wp[6] == 1)
4568                                 break;
4569                 }
4570
4571                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4572                                                         wp[1] - 2)) {
4573                         assoc_data->wmm = false;
4574                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4575                 }
4576                 rcu_read_unlock();
4577         }
4578
4579         /*
4580          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4581          * We still associate in non-HT mode (11a/b/g) if any one of these
4582          * ciphers is configured as pairwise.
4583          * We can set this to true for non-11n hardware, that'll be checked
4584          * separately along with the peer capabilities.
4585          */
4586         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4587                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4588                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4589                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4590                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4591                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4592                         netdev_info(sdata->dev,
4593                                     "disabling HT/VHT due to WEP/TKIP use\n");
4594                 }
4595         }
4596
4597         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4598                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4599                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4600         }
4601
4602         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4603                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4604
4605         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4606         sband = local->hw.wiphy->bands[req->bss->channel->band];
4607         if (!sband->ht_cap.ht_supported ||
4608             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4609             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4610                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4611                 if (!bss->wmm_used &&
4612                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4613                         netdev_info(sdata->dev,
4614                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4615         }
4616
4617         /* disable VHT if we don't support it or the AP doesn't use WMM */
4618         if (!sband->vht_cap.vht_supported ||
4619             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4620             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4621                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4622                 if (!bss->wmm_used &&
4623                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4624                         netdev_info(sdata->dev,
4625                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4626         }
4627
4628         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4629         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4630                sizeof(ifmgd->ht_capa_mask));
4631
4632         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4633         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4634                sizeof(ifmgd->vht_capa_mask));
4635
4636         if (req->ie && req->ie_len) {
4637                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4638                 assoc_data->ie_len = req->ie_len;
4639         }
4640
4641         assoc_data->bss = req->bss;
4642
4643         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4644                 if (ifmgd->powersave)
4645                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4646                 else
4647                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4648         } else
4649                 sdata->smps_mode = ifmgd->req_smps;
4650
4651         assoc_data->capability = req->bss->capability;
4652         assoc_data->supp_rates = bss->supp_rates;
4653         assoc_data->supp_rates_len = bss->supp_rates_len;
4654
4655         rcu_read_lock();
4656         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4657         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4658                 assoc_data->ap_ht_param =
4659                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4660         else
4661                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4662         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4663         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4664                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4665                        sizeof(struct ieee80211_vht_cap));
4666         else
4667                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4668         rcu_read_unlock();
4669
4670         if (bss->wmm_used && bss->uapsd_supported &&
4671             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4672                 assoc_data->uapsd = true;
4673                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4674         } else {
4675                 assoc_data->uapsd = false;
4676                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4677         }
4678
4679         if (req->prev_bssid)
4680                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4681
4682         if (req->use_mfp) {
4683                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4684                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4685         } else {
4686                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4687                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4688         }
4689
4690         if (req->flags & ASSOC_REQ_USE_RRM)
4691                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4692         else
4693                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4694
4695         if (req->crypto.control_port)
4696                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4697         else
4698                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4699
4700         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4701         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4702         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4703                                                         sdata->vif.type);
4704
4705         /* kick off associate process */
4706
4707         ifmgd->assoc_data = assoc_data;
4708         ifmgd->dtim_period = 0;
4709         ifmgd->have_beacon = false;
4710
4711         err = ieee80211_prep_connection(sdata, req->bss, true);
4712         if (err)
4713                 goto err_clear;
4714
4715         rcu_read_lock();
4716         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4717
4718         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4719             !beacon_ies) {
4720                 /*
4721                  * Wait up to one beacon interval ...
4722                  * should this be more if we miss one?
4723                  */
4724                 sdata_info(sdata, "waiting for beacon from %pM\n",
4725                            ifmgd->bssid);
4726                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4727                 assoc_data->timeout_started = true;
4728                 assoc_data->need_beacon = true;
4729         } else if (beacon_ies) {
4730                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4731                                                     beacon_ies->data,
4732                                                     beacon_ies->len);
4733                 u8 dtim_count = 0;
4734
4735                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4736                         const struct ieee80211_tim_ie *tim;
4737                         tim = (void *)(tim_ie + 2);
4738                         ifmgd->dtim_period = tim->dtim_period;
4739                         dtim_count = tim->dtim_count;
4740                 }
4741                 ifmgd->have_beacon = true;
4742                 assoc_data->timeout = jiffies;
4743                 assoc_data->timeout_started = true;
4744
4745                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4746                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4747                         sdata->vif.bss_conf.sync_device_ts =
4748                                 bss->device_ts_beacon;
4749                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4750                 }
4751         } else {
4752                 assoc_data->timeout = jiffies;
4753                 assoc_data->timeout_started = true;
4754         }
4755         rcu_read_unlock();
4756
4757         run_again(sdata, assoc_data->timeout);
4758
4759         if (bss->corrupt_data) {
4760                 char *corrupt_type = "data";
4761                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4762                         if (bss->corrupt_data &
4763                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4764                                 corrupt_type = "beacon and probe response";
4765                         else
4766                                 corrupt_type = "beacon";
4767                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4768                         corrupt_type = "probe response";
4769                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4770                            corrupt_type);
4771         }
4772
4773         return 0;
4774  err_clear:
4775         memset(ifmgd->bssid, 0, ETH_ALEN);
4776         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4777         ifmgd->assoc_data = NULL;
4778  err_free:
4779         kfree(assoc_data);
4780         return err;
4781 }
4782
4783 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4784                          struct cfg80211_deauth_request *req)
4785 {
4786         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4787         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4788         bool tx = !req->local_state_change;
4789
4790         if (ifmgd->auth_data &&
4791             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4792                 sdata_info(sdata,
4793                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4794                            req->bssid, req->reason_code,
4795                            ieee80211_get_reason_code_string(req->reason_code));
4796
4797                 drv_mgd_prepare_tx(sdata->local, sdata);
4798                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4799                                                IEEE80211_STYPE_DEAUTH,
4800                                                req->reason_code, tx,
4801                                                frame_buf);
4802                 ieee80211_destroy_auth_data(sdata, false);
4803                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4804                                       IEEE80211_DEAUTH_FRAME_LEN);
4805
4806                 return 0;
4807         }
4808
4809         if (ifmgd->associated &&
4810             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4811                 sdata_info(sdata,
4812                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4813                            req->bssid, req->reason_code,
4814                            ieee80211_get_reason_code_string(req->reason_code));
4815
4816                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4817                                        req->reason_code, tx, frame_buf);
4818                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4819                                       IEEE80211_DEAUTH_FRAME_LEN);
4820                 return 0;
4821         }
4822
4823         return -ENOTCONN;
4824 }
4825
4826 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4827                            struct cfg80211_disassoc_request *req)
4828 {
4829         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4830         u8 bssid[ETH_ALEN];
4831         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4832
4833         /*
4834          * cfg80211 should catch this ... but it's racy since
4835          * we can receive a disassoc frame, process it, hand it
4836          * to cfg80211 while that's in a locked section already
4837          * trying to tell us that the user wants to disconnect.
4838          */
4839         if (ifmgd->associated != req->bss)
4840                 return -ENOLINK;
4841
4842         sdata_info(sdata,
4843                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4844                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4845
4846         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4847         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4848                                req->reason_code, !req->local_state_change,
4849                                frame_buf);
4850
4851         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4852                               IEEE80211_DEAUTH_FRAME_LEN);
4853
4854         return 0;
4855 }
4856
4857 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4858 {
4859         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4860
4861         /*
4862          * Make sure some work items will not run after this,
4863          * they will not do anything but might not have been
4864          * cancelled when disconnecting.
4865          */
4866         cancel_work_sync(&ifmgd->monitor_work);
4867         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4868         cancel_work_sync(&ifmgd->request_smps_work);
4869         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4870         cancel_work_sync(&ifmgd->chswitch_work);
4871         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4872
4873         sdata_lock(sdata);
4874         if (ifmgd->assoc_data) {
4875                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4876                 ieee80211_destroy_assoc_data(sdata, false);
4877                 cfg80211_assoc_timeout(sdata->dev, bss);
4878         }
4879         if (ifmgd->auth_data)
4880                 ieee80211_destroy_auth_data(sdata, false);
4881         spin_lock_bh(&ifmgd->teardown_lock);
4882         if (ifmgd->teardown_skb) {
4883                 kfree_skb(ifmgd->teardown_skb);
4884                 ifmgd->teardown_skb = NULL;
4885                 ifmgd->orig_teardown_skb = NULL;
4886         }
4887         spin_unlock_bh(&ifmgd->teardown_lock);
4888         del_timer_sync(&ifmgd->timer);
4889         sdata_unlock(sdata);
4890 }
4891
4892 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4893                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4894                                gfp_t gfp)
4895 {
4896         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4897
4898         trace_api_cqm_rssi_notify(sdata, rssi_event);
4899
4900         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4901 }
4902 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
4903
4904 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
4905 {
4906         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4907
4908         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
4909
4910         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
4911 }
4912 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);