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                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 556                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 557         }
 558
 559         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 560                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 561                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 562         }
 563
 564         /*
 565          * Some APs apparently get confused if our capabilities are better
 566          * than theirs, so restrict what we advertise in the assoc request.
 567          */
 568         if (!(ap_vht_cap->vht_cap_info &
 569                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 570                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 571
 572         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 573
 574         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 575         our_bf_sts = cap & mask;
 576
 577         if (ap_bf_sts < our_bf_sts) {
 578                 cap &= ~mask;
 579                 cap |= ap_bf_sts;
 580         }
 581
 582         /* reserve and fill IE */
 583         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 584         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 585 }
 586
 587 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 588 {
 589         struct ieee80211_local *local = sdata->local;
 590         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 591         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 592         struct sk_buff *skb;
 593         struct ieee80211_mgmt *mgmt;
 594         u8 *pos, qos_info;
 595         size_t offset = 0, noffset;
 596         int i, count, rates_len, supp_rates_len, shift;
 597         u16 capab;
 598         struct ieee80211_supported_band *sband;
 599         struct ieee80211_chanctx_conf *chanctx_conf;
 600         struct ieee80211_channel *chan;
 601         u32 rate_flags, rates = 0;
 602
 603         sdata_assert_lock(sdata);
 604
 605         rcu_read_lock();
 606         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 607         if (WARN_ON(!chanctx_conf)) {
 608                 rcu_read_unlock();
 609                 return;
 610         }
 611         chan = chanctx_conf->def.chan;
 612         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 613         rcu_read_unlock();
 614         sband = local->hw.wiphy->bands[chan->band];
 615         shift = ieee80211_vif_get_shift(&sdata->vif);
 616
 617         if (assoc_data->supp_rates_len) {
 618                 /*
 619                  * Get all rates supported by the device and the AP as
 620                  * some APs don't like getting a superset of their rates
 621                  * in the association request (e.g. D-Link DAP 1353 in
 622                  * b-only mode)...
 623                  */
 624                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 625                                                      assoc_data->supp_rates,
 626                                                      assoc_data->supp_rates_len,
 627                                                      &rates);
 628         } else {
 629                 /*
 630                  * In case AP not provide any supported rates information
 631                  * before association, we send information element(s) with
 632                  * all rates that we support.
 633                  */
 634                 rates_len = 0;
 635                 for (i = 0; i < sband->n_bitrates; i++) {
 636                         if ((rate_flags & sband->bitrates[i].flags)
 637                             != rate_flags)
 638                                 continue;
 639                         rates |= BIT(i);
 640                         rates_len++;
 641                 }
 642         }
 643
 644         skb = alloc_skb(local->hw.extra_tx_headroom +
 645                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 646                         2 + assoc_data->ssid_len + /* SSID */
 647                         4 + rates_len + /* (extended) rates */
 648                         4 + /* power capability */
 649                         2 + 2 * sband->n_channels + /* supported channels */
 650                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 651                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 652                         assoc_data->ie_len + /* extra IEs */
 653                         9, /* WMM */
 654                         GFP_KERNEL);
 655         if (!skb)
 656                 return;
 657
 658         skb_reserve(skb, local->hw.extra_tx_headroom);
 659
 660         capab = WLAN_CAPABILITY_ESS;
 661
 662         if (sband->band == IEEE80211_BAND_2GHZ) {
 663                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 664                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 665                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 666                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 667         }
 668
 669         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 670                 capab |= WLAN_CAPABILITY_PRIVACY;
 671
 672         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 673             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 674                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 675
 676         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 677                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 678
 679         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 680         memset(mgmt, 0, 24);
 681         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 682         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 683         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 684
 685         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 686                 skb_put(skb, 10);
 687                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 688                                                   IEEE80211_STYPE_REASSOC_REQ);
 689                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 690                 mgmt->u.reassoc_req.listen_interval =
 691                                 cpu_to_le16(local->hw.conf.listen_interval);
 692                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 693                        ETH_ALEN);
 694         } else {
 695                 skb_put(skb, 4);
 696                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 697                                                   IEEE80211_STYPE_ASSOC_REQ);
 698                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 699                 mgmt->u.assoc_req.listen_interval =
 700                                 cpu_to_le16(local->hw.conf.listen_interval);
 701         }
 702
 703         /* SSID */
 704         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 705         *pos++ = WLAN_EID_SSID;
 706         *pos++ = assoc_data->ssid_len;
 707         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 708
 709         /* add all rates which were marked to be used above */
 710         supp_rates_len = rates_len;
 711         if (supp_rates_len > 8)
 712                 supp_rates_len = 8;
 713
 714         pos = skb_put(skb, supp_rates_len + 2);
 715         *pos++ = WLAN_EID_SUPP_RATES;
 716         *pos++ = supp_rates_len;
 717
 718         count = 0;
 719         for (i = 0; i < sband->n_bitrates; i++) {
 720                 if (BIT(i) & rates) {
 721                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 722                                                 5 * (1 << shift));
 723                         *pos++ = (u8) rate;
 724                         if (++count == 8)
 725                                 break;
 726                 }
 727         }
 728
 729         if (rates_len > count) {
 730                 pos = skb_put(skb, rates_len - count + 2);
 731                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 732                 *pos++ = rates_len - count;
 733
 734                 for (i++; i < sband->n_bitrates; i++) {
 735                         if (BIT(i) & rates) {
 736                                 int rate;
 737                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 738                                                     5 * (1 << shift));
 739                                 *pos++ = (u8) rate;
 740                         }
 741                 }
 742         }
 743
 744         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 745             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 746                 pos = skb_put(skb, 4);
 747                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 748                 *pos++ = 2;
 749                 *pos++ = 0; /* min tx power */
 750                  /* max tx power */
 751                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 752         }
 753
 754         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 755                 /* TODO: get this in reg domain format */
 756                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 757                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 758                 *pos++ = 2 * sband->n_channels;
 759                 for (i = 0; i < sband->n_channels; i++) {
 760                         *pos++ = ieee80211_frequency_to_channel(
 761                                         sband->channels[i].center_freq);
 762                         *pos++ = 1; /* one channel in the subband*/
 763                 }
 764         }
 765
 766         /* if present, add any custom IEs that go before HT */
 767         if (assoc_data->ie_len) {
 768                 static const u8 before_ht[] = {
 769                         WLAN_EID_SSID,
 770                         WLAN_EID_SUPP_RATES,
 771                         WLAN_EID_EXT_SUPP_RATES,
 772                         WLAN_EID_PWR_CAPABILITY,
 773                         WLAN_EID_SUPPORTED_CHANNELS,
 774                         WLAN_EID_RSN,
 775                         WLAN_EID_QOS_CAPA,
 776                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 777                         WLAN_EID_MOBILITY_DOMAIN,
 778                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 779                 };
 780                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 781                                              before_ht, ARRAY_SIZE(before_ht),
 782                                              offset);
 783                 pos = skb_put(skb, noffset - offset);
 784                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 785                 offset = noffset;
 786         }
 787
 788         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 789                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 790                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 791
 792         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 793                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 794                                     sband, chan, sdata->smps_mode);
 795
 796         /* if present, add any custom IEs that go before VHT */
 797         if (assoc_data->ie_len) {
 798                 static const u8 before_vht[] = {
 799                         WLAN_EID_SSID,
 800                         WLAN_EID_SUPP_RATES,
 801                         WLAN_EID_EXT_SUPP_RATES,
 802                         WLAN_EID_PWR_CAPABILITY,
 803                         WLAN_EID_SUPPORTED_CHANNELS,
 804                         WLAN_EID_RSN,
 805                         WLAN_EID_QOS_CAPA,
 806                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 807                         WLAN_EID_MOBILITY_DOMAIN,
 808                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 809                         WLAN_EID_HT_CAPABILITY,
 810                         WLAN_EID_BSS_COEX_2040,
 811                         WLAN_EID_EXT_CAPABILITY,
 812                         WLAN_EID_QOS_TRAFFIC_CAPA,
 813                         WLAN_EID_TIM_BCAST_REQ,
 814                         WLAN_EID_INTERWORKING,
 815                 };
 816                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 817                                              before_vht, ARRAY_SIZE(before_vht),
 818                                              offset);
 819                 pos = skb_put(skb, noffset - offset);
 820                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 821                 offset = noffset;
 822         }
 823
 824         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 825                 ieee80211_add_vht_ie(sdata, skb, sband,
 826                                      &assoc_data->ap_vht_cap);
 827
 828         /* if present, add any custom non-vendor IEs that go after HT */
 829         if (assoc_data->ie_len) {
 830                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 831                                                     assoc_data->ie_len,
 832                                                     offset);
 833                 pos = skb_put(skb, noffset - offset);
 834                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 835                 offset = noffset;
 836         }
 837
 838         if (assoc_data->wmm) {
 839                 if (assoc_data->uapsd) {
 840                         qos_info = ifmgd->uapsd_queues;
 841                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 842                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 843                 } else {
 844                         qos_info = 0;
 845                 }
 846
 847                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 848         }
 849
 850         /* add any remaining custom (i.e. vendor specific here) IEs */
 851         if (assoc_data->ie_len) {
 852                 noffset = assoc_data->ie_len;
 853                 pos = skb_put(skb, noffset - offset);
 854                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 855         }
 856
 857         drv_mgd_prepare_tx(local, sdata);
 858
 859         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 860         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 861                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 862                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 863         ieee80211_tx_skb(sdata, skb);
 864 }
 865
 866 void ieee80211_send_pspoll(struct ieee80211_local *local,
 867                            struct ieee80211_sub_if_data *sdata)
 868 {
 869         struct ieee80211_pspoll *pspoll;
 870         struct sk_buff *skb;
 871
 872         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 873         if (!skb)
 874                 return;
 875
 876         pspoll = (struct ieee80211_pspoll *) skb->data;
 877         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 878
 879         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 880         ieee80211_tx_skb(sdata, skb);
 881 }
 882
 883 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 884                              struct ieee80211_sub_if_data *sdata,
 885                              int powersave)
 886 {
 887         struct sk_buff *skb;
 888         struct ieee80211_hdr_3addr *nullfunc;
 889         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 890
 891         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 892         if (!skb)
 893                 return;
 894
 895         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 896         if (powersave)
 897                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 898
 899         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 900                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 901
 902         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 903                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 904
 905         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 906                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 907
 908         ieee80211_tx_skb(sdata, skb);
 909 }
 910
 911 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 912                                           struct ieee80211_sub_if_data *sdata)
 913 {
 914         struct sk_buff *skb;
 915         struct ieee80211_hdr *nullfunc;
 916         __le16 fc;
 917
 918         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 919                 return;
 920
 921         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 922         if (!skb)
 923                 return;
 924
 925         skb_reserve(skb, local->hw.extra_tx_headroom);
 926
 927         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 928         memset(nullfunc, 0, 30);
 929         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 930                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 931         nullfunc->frame_control = fc;
 932         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 933         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 934         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 935         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 936
 937         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 938         ieee80211_tx_skb(sdata, skb);
 939 }
 940
 941 /* spectrum management related things */
 942 static void ieee80211_chswitch_work(struct work_struct *work)
 943 {
 944         struct ieee80211_sub_if_data *sdata =
 945                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 946         struct ieee80211_local *local = sdata->local;
 947         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 948         int ret;
 949
 950         if (!ieee80211_sdata_running(sdata))
 951                 return;
 952
 953         sdata_lock(sdata);
 954         mutex_lock(&local->mtx);
 955         mutex_lock(&local->chanctx_mtx);
 956
 957         if (!ifmgd->associated)
 958                 goto out;
 959
 960         if (!sdata->vif.csa_active)
 961                 goto out;
 962
 963         /*
 964          * using reservation isn't immediate as it may be deferred until later
 965          * with multi-vif. once reservation is complete it will re-schedule the
 966          * work with no reserved_chanctx so verify chandef to check if it
 967          * completed successfully
 968          */
 969
 970         if (sdata->reserved_chanctx) {
 971                 /*
 972                  * with multi-vif csa driver may call ieee80211_csa_finish()
 973                  * many times while waiting for other interfaces to use their
 974                  * reservations
 975                  */
 976                 if (sdata->reserved_ready)
 977                         goto out;
 978
 979                 ret = ieee80211_vif_use_reserved_context(sdata);
 980                 if (ret) {
 981                         sdata_info(sdata,
 982                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
 983                                    ret);
 984                         ieee80211_queue_work(&sdata->local->hw,
 985                                              &ifmgd->csa_connection_drop_work);
 986                         goto out;
 987                 }
 988
 989                 goto out;
 990         }
 991
 992         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
 993                                         &sdata->csa_chandef)) {
 994                 sdata_info(sdata,
 995                            "failed to finalize channel switch, disconnecting\n");
 996                 ieee80211_queue_work(&sdata->local->hw,
 997                                      &ifmgd->csa_connection_drop_work);
 998                 goto out;
 999         }
1000
1001         /* XXX: shouldn't really modify cfg80211-owned data! */
1002         ifmgd->associated->channel = sdata->csa_chandef.chan;
1003
1004         sdata->vif.csa_active = false;
1005
1006         /* XXX: wait for a beacon first? */
1007         if (sdata->csa_block_tx) {
1008                 ieee80211_wake_vif_queues(local, sdata,
1009                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1010                 sdata->csa_block_tx = false;
1011         }
1012
1013         ieee80211_sta_reset_beacon_monitor(sdata);
1014         ieee80211_sta_reset_conn_monitor(sdata);
1015
1016 out:
1017         mutex_unlock(&local->chanctx_mtx);
1018         mutex_unlock(&local->mtx);
1019         sdata_unlock(sdata);
1020 }
1021
1022 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1023 {
1024         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1025         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1026
1027         trace_api_chswitch_done(sdata, success);
1028         if (!success) {
1029                 sdata_info(sdata,
1030                            "driver channel switch failed, disconnecting\n");
1031                 ieee80211_queue_work(&sdata->local->hw,
1032                                      &ifmgd->csa_connection_drop_work);
1033         } else {
1034                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1035         }
1036 }
1037 EXPORT_SYMBOL(ieee80211_chswitch_done);
1038
1039 static void ieee80211_chswitch_timer(unsigned long data)
1040 {
1041         struct ieee80211_sub_if_data *sdata =
1042                 (struct ieee80211_sub_if_data *) data;
1043
1044         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1045 }
1046
1047 static void
1048 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1049                                  u64 timestamp, struct ieee802_11_elems *elems,
1050                                  bool beacon)
1051 {
1052         struct ieee80211_local *local = sdata->local;
1053         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1054         struct cfg80211_bss *cbss = ifmgd->associated;
1055         struct ieee80211_chanctx_conf *conf;
1056         struct ieee80211_chanctx *chanctx;
1057         enum ieee80211_band current_band;
1058         struct ieee80211_csa_ie csa_ie;
1059         int res;
1060
1061         sdata_assert_lock(sdata);
1062
1063         if (!cbss)
1064                 return;
1065
1066         if (local->scanning)
1067                 return;
1068
1069         /* disregard subsequent announcements if we are already processing */
1070         if (sdata->vif.csa_active)
1071                 return;
1072
1073         current_band = cbss->channel->band;
1074         memset(&csa_ie, 0, sizeof(csa_ie));
1075         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1076                                            ifmgd->flags,
1077                                            ifmgd->associated->bssid, &csa_ie);
1078         if (res < 0)
1079                 ieee80211_queue_work(&local->hw,
1080                                      &ifmgd->csa_connection_drop_work);
1081         if (res)
1082                 return;
1083
1084         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1085                                      IEEE80211_CHAN_DISABLED)) {
1086                 sdata_info(sdata,
1087                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1088                            ifmgd->associated->bssid,
1089                            csa_ie.chandef.chan->center_freq,
1090                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1091                            csa_ie.chandef.center_freq2);
1092                 ieee80211_queue_work(&local->hw,
1093                                      &ifmgd->csa_connection_drop_work);
1094                 return;
1095         }
1096
1097         mutex_lock(&local->mtx);
1098         mutex_lock(&local->chanctx_mtx);
1099         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1100                                          lockdep_is_held(&local->chanctx_mtx));
1101         if (!conf) {
1102                 sdata_info(sdata,
1103                            "no channel context assigned to vif?, disconnecting\n");
1104                 ieee80211_queue_work(&local->hw,
1105                                      &ifmgd->csa_connection_drop_work);
1106                 mutex_unlock(&local->chanctx_mtx);
1107                 mutex_unlock(&local->mtx);
1108                 return;
1109         }
1110
1111         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1112
1113         if (local->use_chanctx) {
1114                 u32 num_chanctx = 0;
1115                 list_for_each_entry(chanctx, &local->chanctx_list, list)
1116                        num_chanctx++;
1117
1118                 if (num_chanctx > 1 ||
1119                     !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1120                         sdata_info(sdata,
1121                                    "not handling chan-switch with channel contexts\n");
1122                         ieee80211_queue_work(&local->hw,
1123                                              &ifmgd->csa_connection_drop_work);
1124                         mutex_unlock(&local->chanctx_mtx);
1125                         mutex_unlock(&local->mtx);
1126                         return;
1127                 }
1128         }
1129
1130         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1131                                             chanctx->mode, false);
1132         if (res) {
1133                 sdata_info(sdata,
1134                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1135                            res);
1136                 ieee80211_queue_work(&local->hw,
1137                                      &ifmgd->csa_connection_drop_work);
1138                 mutex_unlock(&local->chanctx_mtx);
1139                 mutex_unlock(&local->mtx);
1140                 return;
1141         }
1142         mutex_unlock(&local->chanctx_mtx);
1143
1144         sdata->vif.csa_active = true;
1145         sdata->csa_chandef = csa_ie.chandef;
1146         sdata->csa_block_tx = csa_ie.mode;
1147
1148         if (sdata->csa_block_tx)
1149                 ieee80211_stop_vif_queues(local, sdata,
1150                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1151         mutex_unlock(&local->mtx);
1152
1153         if (local->ops->channel_switch) {
1154                 /* use driver's channel switch callback */
1155                 struct ieee80211_channel_switch ch_switch = {
1156                         .timestamp = timestamp,
1157                         .block_tx = csa_ie.mode,
1158                         .chandef = csa_ie.chandef,
1159                         .count = csa_ie.count,
1160                 };
1161
1162                 drv_channel_switch(local, &ch_switch);
1163                 return;
1164         }
1165
1166         /* channel switch handled in software */
1167         if (csa_ie.count <= 1)
1168                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1169         else
1170                 mod_timer(&ifmgd->chswitch_timer,
1171                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1172                                          cbss->beacon_interval));
1173 }
1174
1175 static bool
1176 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1177                                  struct ieee80211_channel *channel,
1178                                  const u8 *country_ie, u8 country_ie_len,
1179                                  const u8 *pwr_constr_elem,
1180                                  int *chan_pwr, int *pwr_reduction)
1181 {
1182         struct ieee80211_country_ie_triplet *triplet;
1183         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1184         int i, chan_increment;
1185         bool have_chan_pwr = false;
1186
1187         /* Invalid IE */
1188         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1189                 return false;
1190
1191         triplet = (void *)(country_ie + 3);
1192         country_ie_len -= 3;
1193
1194         switch (channel->band) {
1195         default:
1196                 WARN_ON_ONCE(1);
1197                 /* fall through */
1198         case IEEE80211_BAND_2GHZ:
1199         case IEEE80211_BAND_60GHZ:
1200                 chan_increment = 1;
1201                 break;
1202         case IEEE80211_BAND_5GHZ:
1203                 chan_increment = 4;
1204                 break;
1205         }
1206
1207         /* find channel */
1208         while (country_ie_len >= 3) {
1209                 u8 first_channel = triplet->chans.first_channel;
1210
1211                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1212                         goto next;
1213
1214                 for (i = 0; i < triplet->chans.num_channels; i++) {
1215                         if (first_channel + i * chan_increment == chan) {
1216                                 have_chan_pwr = true;
1217                                 *chan_pwr = triplet->chans.max_power;
1218                                 break;
1219                         }
1220                 }
1221                 if (have_chan_pwr)
1222                         break;
1223
1224  next:
1225                 triplet++;
1226                 country_ie_len -= 3;
1227         }
1228
1229         if (have_chan_pwr)
1230                 *pwr_reduction = *pwr_constr_elem;
1231         return have_chan_pwr;
1232 }
1233
1234 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1235                                       struct ieee80211_channel *channel,
1236                                       const u8 *cisco_dtpc_ie,
1237                                       int *pwr_level)
1238 {
1239         /* From practical testing, the first data byte of the DTPC element
1240          * seems to contain the requested dBm level, and the CLI on Cisco
1241          * APs clearly state the range is -127 to 127 dBm, which indicates
1242          * a signed byte, although it seemingly never actually goes negative.
1243          * The other byte seems to always be zero.
1244          */
1245         *pwr_level = (__s8)cisco_dtpc_ie[4];
1246 }
1247
1248 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1249                                        struct ieee80211_channel *channel,
1250                                        struct ieee80211_mgmt *mgmt,
1251                                        const u8 *country_ie, u8 country_ie_len,
1252                                        const u8 *pwr_constr_ie,
1253                                        const u8 *cisco_dtpc_ie)
1254 {
1255         bool has_80211h_pwr = false, has_cisco_pwr = false;
1256         int chan_pwr = 0, pwr_reduction_80211h = 0;
1257         int pwr_level_cisco, pwr_level_80211h;
1258         int new_ap_level;
1259
1260         if (country_ie && pwr_constr_ie &&
1261             mgmt->u.probe_resp.capab_info &
1262                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT)) {
1263                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1264                         sdata, channel, country_ie, country_ie_len,
1265                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1266                 pwr_level_80211h =
1267                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1268         }
1269
1270         if (cisco_dtpc_ie) {
1271                 ieee80211_find_cisco_dtpc(
1272                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1273                 has_cisco_pwr = true;
1274         }
1275
1276         if (!has_80211h_pwr && !has_cisco_pwr)
1277                 return 0;
1278
1279         /* If we have both 802.11h and Cisco DTPC, apply both limits
1280          * by picking the smallest of the two power levels advertised.
1281          */
1282         if (has_80211h_pwr &&
1283             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1284                 sdata_info(sdata,
1285                            "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1286                            pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1287                            sdata->u.mgd.bssid);
1288                 new_ap_level = pwr_level_80211h;
1289         } else {  /* has_cisco_pwr is always true here. */
1290                 sdata_info(sdata,
1291                            "Limiting TX power to %d dBm as advertised by %pM\n",
1292                            pwr_level_cisco, sdata->u.mgd.bssid);
1293                 new_ap_level = pwr_level_cisco;
1294         }
1295
1296         if (sdata->ap_power_level == new_ap_level)
1297                 return 0;
1298
1299         sdata->ap_power_level = new_ap_level;
1300         if (__ieee80211_recalc_txpower(sdata))
1301                 return BSS_CHANGED_TXPOWER;
1302         return 0;
1303 }
1304
1305 /* powersave */
1306 static void ieee80211_enable_ps(struct ieee80211_local *local,
1307                                 struct ieee80211_sub_if_data *sdata)
1308 {
1309         struct ieee80211_conf *conf = &local->hw.conf;
1310
1311         /*
1312          * If we are scanning right now then the parameters will
1313          * take effect when scan finishes.
1314          */
1315         if (local->scanning)
1316                 return;
1317
1318         if (conf->dynamic_ps_timeout > 0 &&
1319             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1320                 mod_timer(&local->dynamic_ps_timer, jiffies +
1321                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1322         } else {
1323                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1324                         ieee80211_send_nullfunc(local, sdata, 1);
1325
1326                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1327                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1328                         return;
1329
1330                 conf->flags |= IEEE80211_CONF_PS;
1331                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1332         }
1333 }
1334
1335 static void ieee80211_change_ps(struct ieee80211_local *local)
1336 {
1337         struct ieee80211_conf *conf = &local->hw.conf;
1338
1339         if (local->ps_sdata) {
1340                 ieee80211_enable_ps(local, local->ps_sdata);
1341         } else if (conf->flags & IEEE80211_CONF_PS) {
1342                 conf->flags &= ~IEEE80211_CONF_PS;
1343                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1344                 del_timer_sync(&local->dynamic_ps_timer);
1345                 cancel_work_sync(&local->dynamic_ps_enable_work);
1346         }
1347 }
1348
1349 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1350 {
1351         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1352         struct sta_info *sta = NULL;
1353         bool authorized = false;
1354
1355         if (!mgd->powersave)
1356                 return false;
1357
1358         if (mgd->broken_ap)
1359                 return false;
1360
1361         if (!mgd->associated)
1362                 return false;
1363
1364         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1365                 return false;
1366
1367         if (!mgd->have_beacon)
1368                 return false;
1369
1370         rcu_read_lock();
1371         sta = sta_info_get(sdata, mgd->bssid);
1372         if (sta)
1373                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1374         rcu_read_unlock();
1375
1376         return authorized;
1377 }
1378
1379 /* need to hold RTNL or interface lock */
1380 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1381 {
1382         struct ieee80211_sub_if_data *sdata, *found = NULL;
1383         int count = 0;
1384         int timeout;
1385
1386         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1387                 local->ps_sdata = NULL;
1388                 return;
1389         }
1390
1391         list_for_each_entry(sdata, &local->interfaces, list) {
1392                 if (!ieee80211_sdata_running(sdata))
1393                         continue;
1394                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1395                         /* If an AP vif is found, then disable PS
1396                          * by setting the count to zero thereby setting
1397                          * ps_sdata to NULL.
1398                          */
1399                         count = 0;
1400                         break;
1401                 }
1402                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1403                         continue;
1404                 found = sdata;
1405                 count++;
1406         }
1407
1408         if (count == 1 && ieee80211_powersave_allowed(found)) {
1409                 s32 beaconint_us;
1410
1411                 if (latency < 0)
1412                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1413
1414                 beaconint_us = ieee80211_tu_to_usec(
1415                                         found->vif.bss_conf.beacon_int);
1416
1417                 timeout = local->dynamic_ps_forced_timeout;
1418                 if (timeout < 0) {
1419                         /*
1420                          * Go to full PSM if the user configures a very low
1421                          * latency requirement.
1422                          * The 2000 second value is there for compatibility
1423                          * until the PM_QOS_NETWORK_LATENCY is configured
1424                          * with real values.
1425                          */
1426                         if (latency > (1900 * USEC_PER_MSEC) &&
1427                             latency != (2000 * USEC_PER_SEC))
1428                                 timeout = 0;
1429                         else
1430                                 timeout = 100;
1431                 }
1432                 local->hw.conf.dynamic_ps_timeout = timeout;
1433
1434                 if (beaconint_us > latency) {
1435                         local->ps_sdata = NULL;
1436                 } else {
1437                         int maxslp = 1;
1438                         u8 dtimper = found->u.mgd.dtim_period;
1439
1440                         /* If the TIM IE is invalid, pretend the value is 1 */
1441                         if (!dtimper)
1442                                 dtimper = 1;
1443                         else if (dtimper > 1)
1444                                 maxslp = min_t(int, dtimper,
1445                                                     latency / beaconint_us);
1446
1447                         local->hw.conf.max_sleep_period = maxslp;
1448                         local->hw.conf.ps_dtim_period = dtimper;
1449                         local->ps_sdata = found;
1450                 }
1451         } else {
1452                 local->ps_sdata = NULL;
1453         }
1454
1455         ieee80211_change_ps(local);
1456 }
1457
1458 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1459 {
1460         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1461
1462         if (sdata->vif.bss_conf.ps != ps_allowed) {
1463                 sdata->vif.bss_conf.ps = ps_allowed;
1464                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1465         }
1466 }
1467
1468 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1469 {
1470         struct ieee80211_local *local =
1471                 container_of(work, struct ieee80211_local,
1472                              dynamic_ps_disable_work);
1473
1474         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1475                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1476                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1477         }
1478
1479         ieee80211_wake_queues_by_reason(&local->hw,
1480                                         IEEE80211_MAX_QUEUE_MAP,
1481                                         IEEE80211_QUEUE_STOP_REASON_PS,
1482                                         false);
1483 }
1484
1485 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1486 {
1487         struct ieee80211_local *local =
1488                 container_of(work, struct ieee80211_local,
1489                              dynamic_ps_enable_work);
1490         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1491         struct ieee80211_if_managed *ifmgd;
1492         unsigned long flags;
1493         int q;
1494
1495         /* can only happen when PS was just disabled anyway */
1496         if (!sdata)
1497                 return;
1498
1499         ifmgd = &sdata->u.mgd;
1500
1501         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1502                 return;
1503
1504         if (local->hw.conf.dynamic_ps_timeout > 0) {
1505                 /* don't enter PS if TX frames are pending */
1506                 if (drv_tx_frames_pending(local)) {
1507                         mod_timer(&local->dynamic_ps_timer, jiffies +
1508                                   msecs_to_jiffies(
1509                                   local->hw.conf.dynamic_ps_timeout));
1510                         return;
1511                 }
1512
1513                 /*
1514                  * transmission can be stopped by others which leads to
1515                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1516                  * is not the actual idle state.
1517                  */
1518                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1519                 for (q = 0; q < local->hw.queues; q++) {
1520                         if (local->queue_stop_reasons[q]) {
1521                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1522                                                        flags);
1523                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1524                                           msecs_to_jiffies(
1525                                           local->hw.conf.dynamic_ps_timeout));
1526                                 return;
1527                         }
1528                 }
1529                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1530         }
1531
1532         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1533             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1534                 if (drv_tx_frames_pending(local)) {
1535                         mod_timer(&local->dynamic_ps_timer, jiffies +
1536                                   msecs_to_jiffies(
1537                                   local->hw.conf.dynamic_ps_timeout));
1538                 } else {
1539                         ieee80211_send_nullfunc(local, sdata, 1);
1540                         /* Flush to get the tx status of nullfunc frame */
1541                         ieee80211_flush_queues(local, sdata);
1542                 }
1543         }
1544
1545         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1546               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1547             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1548                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1549                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1550                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1551         }
1552 }
1553
1554 void ieee80211_dynamic_ps_timer(unsigned long data)
1555 {
1556         struct ieee80211_local *local = (void *) data;
1557
1558         if (local->quiescing || local->suspended)
1559                 return;
1560
1561         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1562 }
1563
1564 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1565 {
1566         struct delayed_work *delayed_work =
1567                 container_of(work, struct delayed_work, work);
1568         struct ieee80211_sub_if_data *sdata =
1569                 container_of(delayed_work, struct ieee80211_sub_if_data,
1570                              dfs_cac_timer_work);
1571         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1572
1573         mutex_lock(&sdata->local->mtx);
1574         if (sdata->wdev.cac_started) {
1575                 ieee80211_vif_release_channel(sdata);
1576                 cfg80211_cac_event(sdata->dev, &chandef,
1577                                    NL80211_RADAR_CAC_FINISHED,
1578                                    GFP_KERNEL);
1579         }
1580         mutex_unlock(&sdata->local->mtx);
1581 }
1582
1583 /* MLME */
1584 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1585                                      struct ieee80211_sub_if_data *sdata,
1586                                      const u8 *wmm_param, size_t wmm_param_len)
1587 {
1588         struct ieee80211_tx_queue_params params;
1589         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1590         size_t left;
1591         int count;
1592         const u8 *pos;
1593         u8 uapsd_queues = 0;
1594
1595         if (!local->ops->conf_tx)
1596                 return false;
1597
1598         if (local->hw.queues < IEEE80211_NUM_ACS)
1599                 return false;
1600
1601         if (!wmm_param)
1602                 return false;
1603
1604         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1605                 return false;
1606
1607         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1608                 uapsd_queues = ifmgd->uapsd_queues;
1609
1610         count = wmm_param[6] & 0x0f;
1611         if (count == ifmgd->wmm_last_param_set)
1612                 return false;
1613         ifmgd->wmm_last_param_set = count;
1614
1615         pos = wmm_param + 8;
1616         left = wmm_param_len - 8;
1617
1618         memset(&params, 0, sizeof(params));
1619
1620         sdata->wmm_acm = 0;
1621         for (; left >= 4; left -= 4, pos += 4) {
1622                 int aci = (pos[0] >> 5) & 0x03;
1623                 int acm = (pos[0] >> 4) & 0x01;
1624                 bool uapsd = false;
1625                 int queue;
1626
1627                 switch (aci) {
1628                 case 1: /* AC_BK */
1629                         queue = 3;
1630                         if (acm)
1631                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1632                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1633                                 uapsd = true;
1634                         break;
1635                 case 2: /* AC_VI */
1636                         queue = 1;
1637                         if (acm)
1638                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1639                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1640                                 uapsd = true;
1641                         break;
1642                 case 3: /* AC_VO */
1643                         queue = 0;
1644                         if (acm)
1645                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1646                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1647                                 uapsd = true;
1648                         break;
1649                 case 0: /* AC_BE */
1650                 default:
1651                         queue = 2;
1652                         if (acm)
1653                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1654                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1655                                 uapsd = true;
1656                         break;
1657                 }
1658
1659                 params.aifs = pos[0] & 0x0f;
1660                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1661                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1662                 params.txop = get_unaligned_le16(pos + 2);
1663                 params.acm = acm;
1664                 params.uapsd = uapsd;
1665
1666                 mlme_dbg(sdata,
1667                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1668                          queue, aci, acm,
1669                          params.aifs, params.cw_min, params.cw_max,
1670                          params.txop, params.uapsd);
1671                 sdata->tx_conf[queue] = params;
1672                 if (drv_conf_tx(local, sdata, queue, &params))
1673                         sdata_err(sdata,
1674                                   "failed to set TX queue parameters for queue %d\n",
1675                                   queue);
1676         }
1677
1678         /* enable WMM or activate new settings */
1679         sdata->vif.bss_conf.qos = true;
1680         return true;
1681 }
1682
1683 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1684 {
1685         lockdep_assert_held(&sdata->local->mtx);
1686
1687         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1688         ieee80211_run_deferred_scan(sdata->local);
1689 }
1690
1691 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1692 {
1693         mutex_lock(&sdata->local->mtx);
1694         __ieee80211_stop_poll(sdata);
1695         mutex_unlock(&sdata->local->mtx);
1696 }
1697
1698 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1699                                            u16 capab, bool erp_valid, u8 erp)
1700 {
1701         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1702         u32 changed = 0;
1703         bool use_protection;
1704         bool use_short_preamble;
1705         bool use_short_slot;
1706
1707         if (erp_valid) {
1708                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1709                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1710         } else {
1711                 use_protection = false;
1712                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1713         }
1714
1715         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1716         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1717                 use_short_slot = true;
1718
1719         if (use_protection != bss_conf->use_cts_prot) {
1720                 bss_conf->use_cts_prot = use_protection;
1721                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1722         }
1723
1724         if (use_short_preamble != bss_conf->use_short_preamble) {
1725                 bss_conf->use_short_preamble = use_short_preamble;
1726                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1727         }
1728
1729         if (use_short_slot != bss_conf->use_short_slot) {
1730                 bss_conf->use_short_slot = use_short_slot;
1731                 changed |= BSS_CHANGED_ERP_SLOT;
1732         }
1733
1734         return changed;
1735 }
1736
1737 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1738                                      struct cfg80211_bss *cbss,
1739                                      u32 bss_info_changed)
1740 {
1741         struct ieee80211_bss *bss = (void *)cbss->priv;
1742         struct ieee80211_local *local = sdata->local;
1743         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1744
1745         bss_info_changed |= BSS_CHANGED_ASSOC;
1746         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1747                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1748
1749         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1750                 beacon_loss_count * bss_conf->beacon_int));
1751
1752         sdata->u.mgd.associated = cbss;
1753         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1754
1755         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1756
1757         if (sdata->vif.p2p) {
1758                 const struct cfg80211_bss_ies *ies;
1759
1760                 rcu_read_lock();
1761                 ies = rcu_dereference(cbss->ies);
1762                 if (ies) {
1763                         int ret;
1764
1765                         ret = cfg80211_get_p2p_attr(
1766                                         ies->data, ies->len,
1767                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1768                                         (u8 *) &bss_conf->p2p_noa_attr,
1769                                         sizeof(bss_conf->p2p_noa_attr));
1770                         if (ret >= 2) {
1771                                 sdata->u.mgd.p2p_noa_index =
1772                                         bss_conf->p2p_noa_attr.index;
1773                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1774                         }
1775                 }
1776                 rcu_read_unlock();
1777         }
1778
1779         /* just to be sure */
1780         ieee80211_stop_poll(sdata);
1781
1782         ieee80211_led_assoc(local, 1);
1783
1784         if (sdata->u.mgd.have_beacon) {
1785                 /*
1786                  * If the AP is buggy we may get here with no DTIM period
1787                  * known, so assume it's 1 which is the only safe assumption
1788                  * in that case, although if the TIM IE is broken powersave
1789                  * probably just won't work at all.
1790                  */
1791                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1792                 bss_conf->beacon_rate = bss->beacon_rate;
1793                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1794         } else {
1795                 bss_conf->beacon_rate = NULL;
1796                 bss_conf->dtim_period = 0;
1797         }
1798
1799         bss_conf->assoc = 1;
1800
1801         /* Tell the driver to monitor connection quality (if supported) */
1802         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1803             bss_conf->cqm_rssi_thold)
1804                 bss_info_changed |= BSS_CHANGED_CQM;
1805
1806         /* Enable ARP filtering */
1807         if (bss_conf->arp_addr_cnt)
1808                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1809
1810         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1811
1812         mutex_lock(&local->iflist_mtx);
1813         ieee80211_recalc_ps(local, -1);
1814         mutex_unlock(&local->iflist_mtx);
1815
1816         ieee80211_recalc_smps(sdata);
1817         ieee80211_recalc_ps_vif(sdata);
1818
1819         netif_carrier_on(sdata->dev);
1820 }
1821
1822 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1823                                    u16 stype, u16 reason, bool tx,
1824                                    u8 *frame_buf)
1825 {
1826         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1827         struct ieee80211_local *local = sdata->local;
1828         u32 changed = 0;
1829
1830         sdata_assert_lock(sdata);
1831
1832         if (WARN_ON_ONCE(tx && !frame_buf))
1833                 return;
1834
1835         if (WARN_ON(!ifmgd->associated))
1836                 return;
1837
1838         ieee80211_stop_poll(sdata);
1839
1840         ifmgd->associated = NULL;
1841         netif_carrier_off(sdata->dev);
1842
1843         /*
1844          * if we want to get out of ps before disassoc (why?) we have
1845          * to do it before sending disassoc, as otherwise the null-packet
1846          * won't be valid.
1847          */
1848         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1849                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1850                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1851         }
1852         local->ps_sdata = NULL;
1853
1854         /* disable per-vif ps */
1855         ieee80211_recalc_ps_vif(sdata);
1856
1857         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1858         if (tx)
1859                 ieee80211_flush_queues(local, sdata);
1860
1861         /* deauthenticate/disassociate now */
1862         if (tx || frame_buf)
1863                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1864                                                reason, tx, frame_buf);
1865
1866         /* flush out frame */
1867         if (tx)
1868                 ieee80211_flush_queues(local, sdata);
1869
1870         /* clear bssid only after building the needed mgmt frames */
1871         memset(ifmgd->bssid, 0, ETH_ALEN);
1872
1873         /* remove AP and TDLS peers */
1874         sta_info_flush(sdata);
1875
1876         /* finally reset all BSS / config parameters */
1877         changed |= ieee80211_reset_erp_info(sdata);
1878
1879         ieee80211_led_assoc(local, 0);
1880         changed |= BSS_CHANGED_ASSOC;
1881         sdata->vif.bss_conf.assoc = false;
1882
1883         ifmgd->p2p_noa_index = -1;
1884         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1885                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1886
1887         /* on the next assoc, re-program HT/VHT parameters */
1888         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1889         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1890         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1891         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1892
1893         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1894
1895         del_timer_sync(&local->dynamic_ps_timer);
1896         cancel_work_sync(&local->dynamic_ps_enable_work);
1897
1898         /* Disable ARP filtering */
1899         if (sdata->vif.bss_conf.arp_addr_cnt)
1900                 changed |= BSS_CHANGED_ARP_FILTER;
1901
1902         sdata->vif.bss_conf.qos = false;
1903         changed |= BSS_CHANGED_QOS;
1904
1905         /* The BSSID (not really interesting) and HT changed */
1906         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1907         ieee80211_bss_info_change_notify(sdata, changed);
1908
1909         /* disassociated - set to defaults now */
1910         ieee80211_set_wmm_default(sdata, false);
1911
1912         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1913         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1914         del_timer_sync(&sdata->u.mgd.timer);
1915         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1916
1917         sdata->vif.bss_conf.dtim_period = 0;
1918         sdata->vif.bss_conf.beacon_rate = NULL;
1919
1920         ifmgd->have_beacon = false;
1921
1922         ifmgd->flags = 0;
1923         mutex_lock(&local->mtx);
1924         ieee80211_vif_release_channel(sdata);
1925
1926         sdata->vif.csa_active = false;
1927         if (sdata->csa_block_tx) {
1928                 ieee80211_wake_vif_queues(local, sdata,
1929                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1930                 sdata->csa_block_tx = false;
1931         }
1932         mutex_unlock(&local->mtx);
1933
1934         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1935 }
1936
1937 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1938                              struct ieee80211_hdr *hdr)
1939 {
1940         /*
1941          * We can postpone the mgd.timer whenever receiving unicast frames
1942          * from AP because we know that the connection is working both ways
1943          * at that time. But multicast frames (and hence also beacons) must
1944          * be ignored here, because we need to trigger the timer during
1945          * data idle periods for sending the periodic probe request to the
1946          * AP we're connected to.
1947          */
1948         if (is_multicast_ether_addr(hdr->addr1))
1949                 return;
1950
1951         ieee80211_sta_reset_conn_monitor(sdata);
1952 }
1953
1954 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1955 {
1956         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1957         struct ieee80211_local *local = sdata->local;
1958
1959         mutex_lock(&local->mtx);
1960         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
1961                 goto out;
1962
1963         __ieee80211_stop_poll(sdata);
1964
1965         mutex_lock(&local->iflist_mtx);
1966         ieee80211_recalc_ps(local, -1);
1967         mutex_unlock(&local->iflist_mtx);
1968
1969         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1970                 goto out;
1971
1972         /*
1973          * We've received a probe response, but are not sure whether
1974          * we have or will be receiving any beacons or data, so let's
1975          * schedule the timers again, just in case.
1976          */
1977         ieee80211_sta_reset_beacon_monitor(sdata);
1978
1979         mod_timer(&ifmgd->conn_mon_timer,
1980                   round_jiffies_up(jiffies +
1981                                    IEEE80211_CONNECTION_IDLE_TIME));
1982 out:
1983         mutex_unlock(&local->mtx);
1984 }
1985
1986 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1987                              struct ieee80211_hdr *hdr, bool ack)
1988 {
1989         if (!ieee80211_is_data(hdr->frame_control))
1990             return;
1991
1992         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1993             sdata->u.mgd.probe_send_count > 0) {
1994                 if (ack)
1995                         ieee80211_sta_reset_conn_monitor(sdata);
1996                 else
1997                         sdata->u.mgd.nullfunc_failed = true;
1998                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1999                 return;
2000         }
2001
2002         if (ack)
2003                 ieee80211_sta_reset_conn_monitor(sdata);
2004 }
2005
2006 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2007 {
2008         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2009         const u8 *ssid;
2010         u8 *dst = ifmgd->associated->bssid;
2011         u8 unicast_limit = max(1, max_probe_tries - 3);
2012
2013         /*
2014          * Try sending broadcast probe requests for the last three
2015          * probe requests after the first ones failed since some
2016          * buggy APs only support broadcast probe requests.
2017          */
2018         if (ifmgd->probe_send_count >= unicast_limit)
2019                 dst = NULL;
2020
2021         /*
2022          * When the hardware reports an accurate Tx ACK status, it's
2023          * better to send a nullfunc frame instead of a probe request,
2024          * as it will kick us off the AP quickly if we aren't associated
2025          * anymore. The timeout will be reset if the frame is ACKed by
2026          * the AP.
2027          */
2028         ifmgd->probe_send_count++;
2029
2030         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2031                 ifmgd->nullfunc_failed = false;
2032                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2033         } else {
2034                 int ssid_len;
2035
2036                 rcu_read_lock();
2037                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2038                 if (WARN_ON_ONCE(ssid == NULL))
2039                         ssid_len = 0;
2040                 else
2041                         ssid_len = ssid[1];
2042
2043                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
2044                                          0, (u32) -1, true, 0,
2045                                          ifmgd->associated->channel, false);
2046                 rcu_read_unlock();
2047         }
2048
2049         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2050         run_again(sdata, ifmgd->probe_timeout);
2051         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2052                 ieee80211_flush_queues(sdata->local, sdata);
2053 }
2054
2055 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2056                                    bool beacon)
2057 {
2058         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2059         bool already = false;
2060
2061         if (!ieee80211_sdata_running(sdata))
2062                 return;
2063
2064         sdata_lock(sdata);
2065
2066         if (!ifmgd->associated)
2067                 goto out;
2068
2069         mutex_lock(&sdata->local->mtx);
2070
2071         if (sdata->local->tmp_channel || sdata->local->scanning) {
2072                 mutex_unlock(&sdata->local->mtx);
2073                 goto out;
2074         }
2075
2076         if (beacon) {
2077                 mlme_dbg_ratelimited(sdata,
2078                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2079                                      beacon_loss_count);
2080
2081                 ieee80211_cqm_rssi_notify(&sdata->vif,
2082                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
2083                                           GFP_KERNEL);
2084         }
2085
2086         /*
2087          * The driver/our work has already reported this event or the
2088          * connection monitoring has kicked in and we have already sent
2089          * a probe request. Or maybe the AP died and the driver keeps
2090          * reporting until we disassociate...
2091          *
2092          * In either case we have to ignore the current call to this
2093          * function (except for setting the correct probe reason bit)
2094          * because otherwise we would reset the timer every time and
2095          * never check whether we received a probe response!
2096          */
2097         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2098                 already = true;
2099
2100         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2101
2102         mutex_unlock(&sdata->local->mtx);
2103
2104         if (already)
2105                 goto out;
2106
2107         mutex_lock(&sdata->local->iflist_mtx);
2108         ieee80211_recalc_ps(sdata->local, -1);
2109         mutex_unlock(&sdata->local->iflist_mtx);
2110
2111         ifmgd->probe_send_count = 0;
2112         ieee80211_mgd_probe_ap_send(sdata);
2113  out:
2114         sdata_unlock(sdata);
2115 }
2116
2117 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2118                                           struct ieee80211_vif *vif)
2119 {
2120         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2121         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2122         struct cfg80211_bss *cbss;
2123         struct sk_buff *skb;
2124         const u8 *ssid;
2125         int ssid_len;
2126
2127         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2128                 return NULL;
2129
2130         sdata_assert_lock(sdata);
2131
2132         if (ifmgd->associated)
2133                 cbss = ifmgd->associated;
2134         else if (ifmgd->auth_data)
2135                 cbss = ifmgd->auth_data->bss;
2136         else if (ifmgd->assoc_data)
2137                 cbss = ifmgd->assoc_data->bss;
2138         else
2139                 return NULL;
2140
2141         rcu_read_lock();
2142         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2143         if (WARN_ON_ONCE(ssid == NULL))
2144                 ssid_len = 0;
2145         else
2146                 ssid_len = ssid[1];
2147
2148         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2149                                         (u32) -1, cbss->channel,
2150                                         ssid + 2, ssid_len,
2151                                         NULL, 0, true);
2152         rcu_read_unlock();
2153
2154         return skb;
2155 }
2156 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2157
2158 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2159 {
2160         struct ieee80211_local *local = sdata->local;
2161         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2162         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2163
2164         sdata_lock(sdata);
2165         if (!ifmgd->associated) {
2166                 sdata_unlock(sdata);
2167                 return;
2168         }
2169
2170         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2171                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2172                                true, frame_buf);
2173         mutex_lock(&local->mtx);
2174         sdata->vif.csa_active = false;
2175         if (sdata->csa_block_tx) {
2176                 ieee80211_wake_vif_queues(local, sdata,
2177                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2178                 sdata->csa_block_tx = false;
2179         }
2180         mutex_unlock(&local->mtx);
2181
2182         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2183                               IEEE80211_DEAUTH_FRAME_LEN);
2184         sdata_unlock(sdata);
2185 }
2186
2187 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2188 {
2189         struct ieee80211_sub_if_data *sdata =
2190                 container_of(work, struct ieee80211_sub_if_data,
2191                              u.mgd.beacon_connection_loss_work);
2192         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2193         struct sta_info *sta;
2194
2195         if (ifmgd->associated) {
2196                 rcu_read_lock();
2197                 sta = sta_info_get(sdata, ifmgd->bssid);
2198                 if (sta)
2199                         sta->beacon_loss_count++;
2200                 rcu_read_unlock();
2201         }
2202
2203         if (ifmgd->connection_loss) {
2204                 sdata_info(sdata, "Connection to AP %pM lost\n",
2205                            ifmgd->bssid);
2206                 __ieee80211_disconnect(sdata);
2207         } else {
2208                 ieee80211_mgd_probe_ap(sdata, true);
2209         }
2210 }
2211
2212 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2213 {
2214         struct ieee80211_sub_if_data *sdata =
2215                 container_of(work, struct ieee80211_sub_if_data,
2216                              u.mgd.csa_connection_drop_work);
2217
2218         __ieee80211_disconnect(sdata);
2219 }
2220
2221 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2222 {
2223         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2224         struct ieee80211_hw *hw = &sdata->local->hw;
2225
2226         trace_api_beacon_loss(sdata);
2227
2228         sdata->u.mgd.connection_loss = false;
2229         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2230 }
2231 EXPORT_SYMBOL(ieee80211_beacon_loss);
2232
2233 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2234 {
2235         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2236         struct ieee80211_hw *hw = &sdata->local->hw;
2237
2238         trace_api_connection_loss(sdata);
2239
2240         sdata->u.mgd.connection_loss = true;
2241         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2242 }
2243 EXPORT_SYMBOL(ieee80211_connection_loss);
2244
2245
2246 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2247                                         bool assoc)
2248 {
2249         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2250
2251         sdata_assert_lock(sdata);
2252
2253         if (!assoc) {
2254                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2255
2256                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2257                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2258                 sdata->u.mgd.flags = 0;
2259                 mutex_lock(&sdata->local->mtx);
2260                 ieee80211_vif_release_channel(sdata);
2261                 mutex_unlock(&sdata->local->mtx);
2262         }
2263
2264         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2265         kfree(auth_data);
2266         sdata->u.mgd.auth_data = NULL;
2267 }
2268
2269 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2270                                      struct ieee80211_mgmt *mgmt, size_t len)
2271 {
2272         struct ieee80211_local *local = sdata->local;
2273         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2274         u8 *pos;
2275         struct ieee802_11_elems elems;
2276         u32 tx_flags = 0;
2277
2278         pos = mgmt->u.auth.variable;
2279         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2280         if (!elems.challenge)
2281                 return;
2282         auth_data->expected_transaction = 4;
2283         drv_mgd_prepare_tx(sdata->local, sdata);
2284         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2285                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2286                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2287         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2288                             elems.challenge - 2, elems.challenge_len + 2,
2289                             auth_data->bss->bssid, auth_data->bss->bssid,
2290                             auth_data->key, auth_data->key_len,
2291                             auth_data->key_idx, tx_flags);
2292 }
2293
2294 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2295                                    struct ieee80211_mgmt *mgmt, size_t len)
2296 {
2297         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2298         u8 bssid[ETH_ALEN];
2299         u16 auth_alg, auth_transaction, status_code;
2300         struct sta_info *sta;
2301
2302         sdata_assert_lock(sdata);
2303
2304         if (len < 24 + 6)
2305                 return;
2306
2307         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2308                 return;
2309
2310         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2311
2312         if (!ether_addr_equal(bssid, mgmt->bssid))
2313                 return;
2314
2315         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2316         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2317         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2318
2319         if (auth_alg != ifmgd->auth_data->algorithm ||
2320             auth_transaction != ifmgd->auth_data->expected_transaction) {
2321                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2322                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2323                            auth_transaction,
2324                            ifmgd->auth_data->expected_transaction);
2325                 return;
2326         }
2327
2328         if (status_code != WLAN_STATUS_SUCCESS) {
2329                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2330                            mgmt->sa, status_code);
2331                 ieee80211_destroy_auth_data(sdata, false);
2332                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2333                 return;
2334         }
2335
2336         switch (ifmgd->auth_data->algorithm) {
2337         case WLAN_AUTH_OPEN:
2338         case WLAN_AUTH_LEAP:
2339         case WLAN_AUTH_FT:
2340         case WLAN_AUTH_SAE:
2341                 break;
2342         case WLAN_AUTH_SHARED_KEY:
2343                 if (ifmgd->auth_data->expected_transaction != 4) {
2344                         ieee80211_auth_challenge(sdata, mgmt, len);
2345                         /* need another frame */
2346                         return;
2347                 }
2348                 break;
2349         default:
2350                 WARN_ONCE(1, "invalid auth alg %d",
2351                           ifmgd->auth_data->algorithm);
2352                 return;
2353         }
2354
2355         sdata_info(sdata, "authenticated\n");
2356         ifmgd->auth_data->done = true;
2357         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2358         ifmgd->auth_data->timeout_started = true;
2359         run_again(sdata, ifmgd->auth_data->timeout);
2360
2361         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2362             ifmgd->auth_data->expected_transaction != 2) {
2363                 /*
2364                  * Report auth frame to user space for processing since another
2365                  * round of Authentication frames is still needed.
2366                  */
2367                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2368                 return;
2369         }
2370
2371         /* move station state to auth */
2372         mutex_lock(&sdata->local->sta_mtx);
2373         sta = sta_info_get(sdata, bssid);
2374         if (!sta) {
2375                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2376                 goto out_err;
2377         }
2378         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2379                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2380                 goto out_err;
2381         }
2382         mutex_unlock(&sdata->local->sta_mtx);
2383
2384         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2385         return;
2386  out_err:
2387         mutex_unlock(&sdata->local->sta_mtx);
2388         /* ignore frame -- wait for timeout */
2389 }
2390
2391 #define case_WLAN(type) \
2392         case WLAN_REASON_##type: return #type
2393
2394 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2395 {
2396         switch (reason_code) {
2397         case_WLAN(UNSPECIFIED);
2398         case_WLAN(PREV_AUTH_NOT_VALID);
2399         case_WLAN(DEAUTH_LEAVING);
2400         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2401         case_WLAN(DISASSOC_AP_BUSY);
2402         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2403         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2404         case_WLAN(DISASSOC_STA_HAS_LEFT);
2405         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2406         case_WLAN(DISASSOC_BAD_POWER);
2407         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2408         case_WLAN(INVALID_IE);
2409         case_WLAN(MIC_FAILURE);
2410         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2411         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2412         case_WLAN(IE_DIFFERENT);
2413         case_WLAN(INVALID_GROUP_CIPHER);
2414         case_WLAN(INVALID_PAIRWISE_CIPHER);
2415         case_WLAN(INVALID_AKMP);
2416         case_WLAN(UNSUPP_RSN_VERSION);
2417         case_WLAN(INVALID_RSN_IE_CAP);
2418         case_WLAN(IEEE8021X_FAILED);
2419         case_WLAN(CIPHER_SUITE_REJECTED);
2420         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2421         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2422         case_WLAN(DISASSOC_LOW_ACK);
2423         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2424         case_WLAN(QSTA_LEAVE_QBSS);
2425         case_WLAN(QSTA_NOT_USE);
2426         case_WLAN(QSTA_REQUIRE_SETUP);
2427         case_WLAN(QSTA_TIMEOUT);
2428         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2429         case_WLAN(MESH_PEER_CANCELED);
2430         case_WLAN(MESH_MAX_PEERS);
2431         case_WLAN(MESH_CONFIG);
2432         case_WLAN(MESH_CLOSE);
2433         case_WLAN(MESH_MAX_RETRIES);
2434         case_WLAN(MESH_CONFIRM_TIMEOUT);
2435         case_WLAN(MESH_INVALID_GTK);
2436         case_WLAN(MESH_INCONSISTENT_PARAM);
2437         case_WLAN(MESH_INVALID_SECURITY);
2438         case_WLAN(MESH_PATH_ERROR);
2439         case_WLAN(MESH_PATH_NOFORWARD);
2440         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2441         case_WLAN(MAC_EXISTS_IN_MBSS);
2442         case_WLAN(MESH_CHAN_REGULATORY);
2443         case_WLAN(MESH_CHAN);
2444         default: return "<unknown>";
2445         }
2446 }
2447
2448 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2449                                      struct ieee80211_mgmt *mgmt, size_t len)
2450 {
2451         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2452         const u8 *bssid = NULL;
2453         u16 reason_code;
2454
2455         sdata_assert_lock(sdata);
2456
2457         if (len < 24 + 2)
2458                 return;
2459
2460         if (!ifmgd->associated ||
2461             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2462                 return;
2463
2464         bssid = ifmgd->associated->bssid;
2465
2466         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2467
2468         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2469                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2470
2471         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2472
2473         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2474 }
2475
2476
2477 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2478                                        struct ieee80211_mgmt *mgmt, size_t len)
2479 {
2480         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2481         u16 reason_code;
2482
2483         sdata_assert_lock(sdata);
2484
2485         if (len < 24 + 2)
2486                 return;
2487
2488         if (!ifmgd->associated ||
2489             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2490                 return;
2491
2492         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2493
2494         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2495                    mgmt->sa, reason_code);
2496
2497         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2498
2499         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2500 }
2501
2502 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2503                                 u8 *supp_rates, unsigned int supp_rates_len,
2504                                 u32 *rates, u32 *basic_rates,
2505                                 bool *have_higher_than_11mbit,
2506                                 int *min_rate, int *min_rate_index,
2507                                 int shift, u32 rate_flags)
2508 {
2509         int i, j;
2510
2511         for (i = 0; i < supp_rates_len; i++) {
2512                 int rate = supp_rates[i] & 0x7f;
2513                 bool is_basic = !!(supp_rates[i] & 0x80);
2514
2515                 if ((rate * 5 * (1 << shift)) > 110)
2516                         *have_higher_than_11mbit = true;
2517
2518                 /*
2519                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2520                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2521                  *
2522                  * Note: Even through the membership selector and the basic
2523                  *       rate flag share the same bit, they are not exactly
2524                  *       the same.
2525                  */
2526                 if (!!(supp_rates[i] & 0x80) &&
2527                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2528                         continue;
2529
2530                 for (j = 0; j < sband->n_bitrates; j++) {
2531                         struct ieee80211_rate *br;
2532                         int brate;
2533
2534                         br = &sband->bitrates[j];
2535                         if ((rate_flags & br->flags) != rate_flags)
2536                                 continue;
2537
2538                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2539                         if (brate == rate) {
2540                                 *rates |= BIT(j);
2541                                 if (is_basic)
2542                                         *basic_rates |= BIT(j);
2543                                 if ((rate * 5) < *min_rate) {
2544                                         *min_rate = rate * 5;
2545                                         *min_rate_index = j;
2546                                 }
2547                                 break;
2548                         }
2549                 }
2550         }
2551 }
2552
2553 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2554                                          bool assoc)
2555 {
2556         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2557
2558         sdata_assert_lock(sdata);
2559
2560         if (!assoc) {
2561                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2562
2563                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2564                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2565                 sdata->u.mgd.flags = 0;
2566                 mutex_lock(&sdata->local->mtx);
2567                 ieee80211_vif_release_channel(sdata);
2568                 mutex_unlock(&sdata->local->mtx);
2569         }
2570
2571         kfree(assoc_data);
2572         sdata->u.mgd.assoc_data = NULL;
2573 }
2574
2575 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2576                                     struct cfg80211_bss *cbss,
2577                                     struct ieee80211_mgmt *mgmt, size_t len)
2578 {
2579         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2580         struct ieee80211_local *local = sdata->local;
2581         struct ieee80211_supported_band *sband;
2582         struct sta_info *sta;
2583         u8 *pos;
2584         u16 capab_info, aid;
2585         struct ieee802_11_elems elems;
2586         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2587         const struct cfg80211_bss_ies *bss_ies = NULL;
2588         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2589         u32 changed = 0;
2590         int err;
2591         bool ret;
2592
2593         /* AssocResp and ReassocResp have identical structure */
2594
2595         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2596         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2597
2598         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2599                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2600                            aid);
2601         aid &= ~(BIT(15) | BIT(14));
2602
2603         ifmgd->broken_ap = false;
2604
2605         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2606                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2607                            aid);
2608                 aid = 0;
2609                 ifmgd->broken_ap = true;
2610         }
2611
2612         pos = mgmt->u.assoc_resp.variable;
2613         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2614
2615         if (!elems.supp_rates) {
2616                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2617                 return false;
2618         }
2619
2620         ifmgd->aid = aid;
2621
2622         /*
2623          * Some APs are erroneously not including some information in their
2624          * (re)association response frames. Try to recover by using the data
2625          * from the beacon or probe response. This seems to afflict mobile
2626          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2627          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2628          */
2629         if ((assoc_data->wmm && !elems.wmm_param) ||
2630             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2631              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2632             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2633              (!elems.vht_cap_elem || !elems.vht_operation))) {
2634                 const struct cfg80211_bss_ies *ies;
2635                 struct ieee802_11_elems bss_elems;
2636
2637                 rcu_read_lock();
2638                 ies = rcu_dereference(cbss->ies);
2639                 if (ies)
2640                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2641                                           GFP_ATOMIC);
2642                 rcu_read_unlock();
2643                 if (!bss_ies)
2644                         return false;
2645
2646                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2647                                        false, &bss_elems);
2648                 if (assoc_data->wmm &&
2649                     !elems.wmm_param && bss_elems.wmm_param) {
2650                         elems.wmm_param = bss_elems.wmm_param;
2651                         sdata_info(sdata,
2652                                    "AP bug: WMM param missing from AssocResp\n");
2653                 }
2654
2655                 /*
2656                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2657                  * have to include the IEs in the (re)association response.
2658                  */
2659                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2660                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2661                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2662                         sdata_info(sdata,
2663                                    "AP bug: HT capability missing from AssocResp\n");
2664                 }
2665                 if (!elems.ht_operation && bss_elems.ht_operation &&
2666                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2667                         elems.ht_operation = bss_elems.ht_operation;
2668                         sdata_info(sdata,
2669                                    "AP bug: HT operation missing from AssocResp\n");
2670                 }
2671                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2672                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2673                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2674                         sdata_info(sdata,
2675                                    "AP bug: VHT capa missing from AssocResp\n");
2676                 }
2677                 if (!elems.vht_operation && bss_elems.vht_operation &&
2678                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2679                         elems.vht_operation = bss_elems.vht_operation;
2680                         sdata_info(sdata,
2681                                    "AP bug: VHT operation missing from AssocResp\n");
2682                 }
2683         }
2684
2685         /*
2686          * We previously checked these in the beacon/probe response, so
2687          * they should be present here. This is just a safety net.
2688          */
2689         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2690             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2691                 sdata_info(sdata,
2692                            "HT AP is missing WMM params or HT capability/operation\n");
2693                 ret = false;
2694                 goto out;
2695         }
2696
2697         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2698             (!elems.vht_cap_elem || !elems.vht_operation)) {
2699                 sdata_info(sdata,
2700                            "VHT AP is missing VHT capability/operation\n");
2701                 ret = false;
2702                 goto out;
2703         }
2704
2705         mutex_lock(&sdata->local->sta_mtx);
2706         /*
2707          * station info was already allocated and inserted before
2708          * the association and should be available to us
2709          */
2710         sta = sta_info_get(sdata, cbss->bssid);
2711         if (WARN_ON(!sta)) {
2712                 mutex_unlock(&sdata->local->sta_mtx);
2713                 ret = false;
2714                 goto out;
2715         }
2716
2717         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2718
2719         /* Set up internal HT/VHT capabilities */
2720         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2721                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2722                                                   elems.ht_cap_elem, sta);
2723
2724         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2725                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2726                                                     elems.vht_cap_elem, sta);
2727
2728         /*
2729          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2730          * in their association response, so ignore that data for our own
2731          * configuration. If it changed since the last beacon, we'll get the
2732          * next beacon and update then.
2733          */
2734
2735         /*
2736          * If an operating mode notification IE is present, override the
2737          * NSS calculation (that would be done in rate_control_rate_init())
2738          * and use the # of streams from that element.
2739          */
2740         if (elems.opmode_notif &&
2741             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2742                 u8 nss;
2743
2744                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2745                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2746                 nss += 1;
2747                 sta->sta.rx_nss = nss;
2748         }
2749
2750         rate_control_rate_init(sta);
2751
2752         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2753                 set_sta_flag(sta, WLAN_STA_MFP);
2754
2755         sta->sta.wme = elems.wmm_param;
2756
2757         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2758         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2759                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2760         if (err) {
2761                 sdata_info(sdata,
2762                            "failed to move station %pM to desired state\n",
2763                            sta->sta.addr);
2764                 WARN_ON(__sta_info_destroy(sta));
2765                 mutex_unlock(&sdata->local->sta_mtx);
2766                 ret = false;
2767                 goto out;
2768         }
2769
2770         mutex_unlock(&sdata->local->sta_mtx);
2771
2772         /*
2773          * Always handle WMM once after association regardless
2774          * of the first value the AP uses. Setting -1 here has
2775          * that effect because the AP values is an unsigned
2776          * 4-bit value.
2777          */
2778         ifmgd->wmm_last_param_set = -1;
2779
2780         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2781                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2782                                          elems.wmm_param_len);
2783         else
2784                 ieee80211_set_wmm_default(sdata, false);
2785         changed |= BSS_CHANGED_QOS;
2786
2787         /* set AID and assoc capability,
2788          * ieee80211_set_associated() will tell the driver */
2789         bss_conf->aid = aid;
2790         bss_conf->assoc_capability = capab_info;
2791         ieee80211_set_associated(sdata, cbss, changed);
2792
2793         /*
2794          * If we're using 4-addr mode, let the AP know that we're
2795          * doing so, so that it can create the STA VLAN on its side
2796          */
2797         if (ifmgd->use_4addr)
2798                 ieee80211_send_4addr_nullfunc(local, sdata);
2799
2800         /*
2801          * Start timer to probe the connection to the AP now.
2802          * Also start the timer that will detect beacon loss.
2803          */
2804         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2805         ieee80211_sta_reset_beacon_monitor(sdata);
2806
2807         ret = true;
2808  out:
2809         kfree(bss_ies);
2810         return ret;
2811 }
2812
2813 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2814                                          struct ieee80211_mgmt *mgmt,
2815                                          size_t len)
2816 {
2817         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2818         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2819         u16 capab_info, status_code, aid;
2820         struct ieee802_11_elems elems;
2821         int ac, uapsd_queues = -1;
2822         u8 *pos;
2823         bool reassoc;
2824         struct cfg80211_bss *bss;
2825
2826         sdata_assert_lock(sdata);
2827
2828         if (!assoc_data)
2829                 return;
2830         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2831                 return;
2832
2833         /*
2834          * AssocResp and ReassocResp have identical structure, so process both
2835          * of them in this function.
2836          */
2837
2838         if (len < 24 + 6)
2839                 return;
2840
2841         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2842         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2843         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2844         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2845
2846         sdata_info(sdata,
2847                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2848                    reassoc ? "Rea" : "A", mgmt->sa,
2849                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2850
2851         pos = mgmt->u.assoc_resp.variable;
2852         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2853
2854         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2855             elems.timeout_int &&
2856             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2857                 u32 tu, ms;
2858                 tu = le32_to_cpu(elems.timeout_int->value);
2859                 ms = tu * 1024 / 1000;
2860                 sdata_info(sdata,
2861                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2862                            mgmt->sa, tu, ms);
2863                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2864                 assoc_data->timeout_started = true;
2865                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2866                         run_again(sdata, assoc_data->timeout);
2867                 return;
2868         }
2869
2870         bss = assoc_data->bss;
2871
2872         if (status_code != WLAN_STATUS_SUCCESS) {
2873                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2874                            mgmt->sa, status_code);
2875                 ieee80211_destroy_assoc_data(sdata, false);
2876         } else {
2877                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2878                         /* oops -- internal error -- send timeout for now */
2879                         ieee80211_destroy_assoc_data(sdata, false);
2880                         cfg80211_assoc_timeout(sdata->dev, bss);
2881                         return;
2882                 }
2883                 sdata_info(sdata, "associated\n");
2884
2885                 /*
2886                  * destroy assoc_data afterwards, as otherwise an idle
2887                  * recalc after assoc_data is NULL but before associated
2888                  * is set can cause the interface to go idle
2889                  */
2890                 ieee80211_destroy_assoc_data(sdata, true);
2891
2892                 /* get uapsd queues configuration */
2893                 uapsd_queues = 0;
2894                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2895                         if (sdata->tx_conf[ac].uapsd)
2896                                 uapsd_queues |= BIT(ac);
2897         }
2898
2899         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
2900 }
2901
2902 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2903                                   struct ieee80211_mgmt *mgmt, size_t len,
2904                                   struct ieee80211_rx_status *rx_status,
2905                                   struct ieee802_11_elems *elems)
2906 {
2907         struct ieee80211_local *local = sdata->local;
2908         struct ieee80211_bss *bss;
2909         struct ieee80211_channel *channel;
2910
2911         sdata_assert_lock(sdata);
2912
2913         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
2914         if (!channel)
2915                 return;
2916
2917         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2918                                         channel);
2919         if (bss) {
2920                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2921                 ieee80211_rx_bss_put(local, bss);
2922         }
2923 }
2924
2925
2926 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2927                                          struct sk_buff *skb)
2928 {
2929         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2930         struct ieee80211_if_managed *ifmgd;
2931         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2932         size_t baselen, len = skb->len;
2933         struct ieee802_11_elems elems;
2934
2935         ifmgd = &sdata->u.mgd;
2936
2937         sdata_assert_lock(sdata);
2938
2939         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2940                 return; /* ignore ProbeResp to foreign address */
2941
2942         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2943         if (baselen > len)
2944                 return;
2945
2946         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2947                                false, &elems);
2948
2949         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2950
2951         if (ifmgd->associated &&
2952             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2953                 ieee80211_reset_ap_probe(sdata);
2954
2955         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2956             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2957                 /* got probe response, continue with auth */
2958                 sdata_info(sdata, "direct probe responded\n");
2959                 ifmgd->auth_data->tries = 0;
2960                 ifmgd->auth_data->timeout = jiffies;
2961                 ifmgd->auth_data->timeout_started = true;
2962                 run_again(sdata, ifmgd->auth_data->timeout);
2963         }
2964 }
2965
2966 /*
2967  * This is the canonical list of information elements we care about,
2968  * the filter code also gives us all changes to the Microsoft OUI
2969  * (00:50:F2) vendor IE which is used for WMM which we need to track,
2970  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
2971  * changes to requested client power.
2972  *
2973  * We implement beacon filtering in software since that means we can
2974  * avoid processing the frame here and in cfg80211, and userspace
2975  * will not be able to tell whether the hardware supports it or not.
2976  *
2977  * XXX: This list needs to be dynamic -- userspace needs to be able to
2978  *      add items it requires. It also needs to be able to tell us to
2979  *      look out for other vendor IEs.
2980  */
2981 static const u64 care_about_ies =
2982         (1ULL << WLAN_EID_COUNTRY) |
2983         (1ULL << WLAN_EID_ERP_INFO) |
2984         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2985         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2986         (1ULL << WLAN_EID_HT_CAPABILITY) |
2987         (1ULL << WLAN_EID_HT_OPERATION);
2988
2989 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2990                                      struct ieee80211_mgmt *mgmt, size_t len,
2991                                      struct ieee80211_rx_status *rx_status)
2992 {
2993         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2994         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2995         size_t baselen;
2996         struct ieee802_11_elems elems;
2997         struct ieee80211_local *local = sdata->local;
2998         struct ieee80211_chanctx_conf *chanctx_conf;
2999         struct ieee80211_channel *chan;
3000         struct sta_info *sta;
3001         u32 changed = 0;
3002         bool erp_valid;
3003         u8 erp_value = 0;
3004         u32 ncrc;
3005         u8 *bssid;
3006         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3007
3008         sdata_assert_lock(sdata);
3009
3010         /* Process beacon from the current BSS */
3011         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3012         if (baselen > len)
3013                 return;
3014
3015         rcu_read_lock();
3016         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3017         if (!chanctx_conf) {
3018                 rcu_read_unlock();
3019                 return;
3020         }
3021
3022         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3023                 rcu_read_unlock();
3024                 return;
3025         }
3026         chan = chanctx_conf->def.chan;
3027         rcu_read_unlock();
3028
3029         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3030             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3031                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3032                                        len - baselen, false, &elems);
3033
3034                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3035                 if (elems.tim && !elems.parse_error) {
3036                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3037                         ifmgd->dtim_period = tim_ie->dtim_period;
3038                 }
3039                 ifmgd->have_beacon = true;
3040                 ifmgd->assoc_data->need_beacon = false;
3041                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3042                         sdata->vif.bss_conf.sync_tsf =
3043                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3044                         sdata->vif.bss_conf.sync_device_ts =
3045                                 rx_status->device_timestamp;
3046                         if (elems.tim)
3047                                 sdata->vif.bss_conf.sync_dtim_count =
3048                                         elems.tim->dtim_count;
3049                         else
3050                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3051                 }
3052                 /* continue assoc process */
3053                 ifmgd->assoc_data->timeout = jiffies;
3054                 ifmgd->assoc_data->timeout_started = true;
3055                 run_again(sdata, ifmgd->assoc_data->timeout);
3056                 return;
3057         }
3058
3059         if (!ifmgd->associated ||
3060             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3061                 return;
3062         bssid = ifmgd->associated->bssid;
3063
3064         /* Track average RSSI from the Beacon frames of the current AP */
3065         ifmgd->last_beacon_signal = rx_status->signal;
3066         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3067                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3068                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3069                 ifmgd->last_cqm_event_signal = 0;
3070                 ifmgd->count_beacon_signal = 1;
3071                 ifmgd->last_ave_beacon_signal = 0;
3072         } else {
3073                 ifmgd->ave_beacon_signal =
3074                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3075                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3076                          ifmgd->ave_beacon_signal) / 16;
3077                 ifmgd->count_beacon_signal++;
3078         }
3079
3080         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3081             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3082                 int sig = ifmgd->ave_beacon_signal;
3083                 int last_sig = ifmgd->last_ave_beacon_signal;
3084
3085                 /*
3086                  * if signal crosses either of the boundaries, invoke callback
3087                  * with appropriate parameters
3088                  */
3089                 if (sig > ifmgd->rssi_max_thold &&
3090                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3091                         ifmgd->last_ave_beacon_signal = sig;
3092                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3093                 } else if (sig < ifmgd->rssi_min_thold &&
3094                            (last_sig >= ifmgd->rssi_max_thold ||
3095                            last_sig == 0)) {
3096                         ifmgd->last_ave_beacon_signal = sig;
3097                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3098                 }
3099         }
3100
3101         if (bss_conf->cqm_rssi_thold &&
3102             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3103             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3104                 int sig = ifmgd->ave_beacon_signal / 16;
3105                 int last_event = ifmgd->last_cqm_event_signal;
3106                 int thold = bss_conf->cqm_rssi_thold;
3107                 int hyst = bss_conf->cqm_rssi_hyst;
3108                 if (sig < thold &&
3109                     (last_event == 0 || sig < last_event - hyst)) {
3110                         ifmgd->last_cqm_event_signal = sig;
3111                         ieee80211_cqm_rssi_notify(
3112                                 &sdata->vif,
3113                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3114                                 GFP_KERNEL);
3115                 } else if (sig > thold &&
3116                            (last_event == 0 || sig > last_event + hyst)) {
3117                         ifmgd->last_cqm_event_signal = sig;
3118                         ieee80211_cqm_rssi_notify(
3119                                 &sdata->vif,
3120                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3121                                 GFP_KERNEL);
3122                 }
3123         }
3124
3125         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3126                 mlme_dbg_ratelimited(sdata,
3127                                      "cancelling AP probe due to a received beacon\n");
3128                 ieee80211_reset_ap_probe(sdata);
3129         }
3130
3131         /*
3132          * Push the beacon loss detection into the future since
3133          * we are processing a beacon from the AP just now.
3134          */
3135         ieee80211_sta_reset_beacon_monitor(sdata);
3136
3137         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3138         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3139                                           len - baselen, false, &elems,
3140                                           care_about_ies, ncrc);
3141
3142         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3143                 bool directed_tim = ieee80211_check_tim(elems.tim,
3144                                                         elems.tim_len,
3145                                                         ifmgd->aid);
3146                 if (directed_tim) {
3147                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3148                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3149                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3150                                         ieee80211_hw_config(local,
3151                                                             IEEE80211_CONF_CHANGE_PS);
3152                                 }
3153                                 ieee80211_send_nullfunc(local, sdata, 0);
3154                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3155                                 local->pspolling = true;
3156
3157                                 /*
3158                                  * Here is assumed that the driver will be
3159                                  * able to send ps-poll frame and receive a
3160                                  * response even though power save mode is
3161                                  * enabled, but some drivers might require
3162                                  * to disable power save here. This needs
3163                                  * to be investigated.
3164                                  */
3165                                 ieee80211_send_pspoll(local, sdata);
3166                         }
3167                 }
3168         }
3169
3170         if (sdata->vif.p2p) {
3171                 struct ieee80211_p2p_noa_attr noa = {};
3172                 int ret;
3173
3174                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3175                                             len - baselen,
3176                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3177                                             (u8 *) &noa, sizeof(noa));
3178                 if (ret >= 2) {
3179                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3180                                 /* valid noa_attr and index changed */
3181                                 sdata->u.mgd.p2p_noa_index = noa.index;
3182                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3183                                 changed |= BSS_CHANGED_P2P_PS;
3184                                 /*
3185                                  * make sure we update all information, the CRC
3186                                  * mechanism doesn't look at P2P attributes.
3187                                  */
3188                                 ifmgd->beacon_crc_valid = false;
3189                         }
3190                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3191                         /* noa_attr not found and we had valid noa_attr before */
3192                         sdata->u.mgd.p2p_noa_index = -1;
3193                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3194                         changed |= BSS_CHANGED_P2P_PS;
3195                         ifmgd->beacon_crc_valid = false;
3196                 }
3197         }
3198
3199         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3200                 return;
3201         ifmgd->beacon_crc = ncrc;
3202         ifmgd->beacon_crc_valid = true;
3203
3204         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3205
3206         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3207                                          &elems, true);
3208
3209         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3210             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3211                                      elems.wmm_param_len))
3212                 changed |= BSS_CHANGED_QOS;
3213
3214         /*
3215          * If we haven't had a beacon before, tell the driver about the
3216          * DTIM period (and beacon timing if desired) now.
3217          */
3218         if (!ifmgd->have_beacon) {
3219                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3220                 if (elems.tim)
3221                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3222                 else
3223                         bss_conf->dtim_period = 1;
3224
3225                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3226                         sdata->vif.bss_conf.sync_tsf =
3227                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3228                         sdata->vif.bss_conf.sync_device_ts =
3229                                 rx_status->device_timestamp;
3230                         if (elems.tim)
3231                                 sdata->vif.bss_conf.sync_dtim_count =
3232                                         elems.tim->dtim_count;
3233                         else
3234                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3235                 }
3236
3237                 changed |= BSS_CHANGED_BEACON_INFO;
3238                 ifmgd->have_beacon = true;
3239
3240                 mutex_lock(&local->iflist_mtx);
3241                 ieee80211_recalc_ps(local, -1);
3242                 mutex_unlock(&local->iflist_mtx);
3243
3244                 ieee80211_recalc_ps_vif(sdata);
3245         }
3246
3247         if (elems.erp_info) {
3248                 erp_valid = true;
3249                 erp_value = elems.erp_info[0];
3250         } else {
3251                 erp_valid = false;
3252         }
3253         changed |= ieee80211_handle_bss_capability(sdata,
3254                         le16_to_cpu(mgmt->u.beacon.capab_info),
3255                         erp_valid, erp_value);
3256
3257         mutex_lock(&local->sta_mtx);
3258         sta = sta_info_get(sdata, bssid);
3259
3260         if (ieee80211_config_bw(sdata, sta,
3261                                 elems.ht_cap_elem, elems.ht_operation,
3262                                 elems.vht_operation, bssid, &changed)) {
3263                 mutex_unlock(&local->sta_mtx);
3264                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3265                                        WLAN_REASON_DEAUTH_LEAVING,
3266                                        true, deauth_buf);
3267                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3268                                       sizeof(deauth_buf));
3269                 return;
3270         }
3271
3272         if (sta && elems.opmode_notif)
3273                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3274                                             rx_status->band, true);
3275         mutex_unlock(&local->sta_mtx);
3276
3277         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3278                                                elems.country_elem,
3279                                                elems.country_elem_len,
3280                                                elems.pwr_constr_elem,
3281                                                elems.cisco_dtpc_elem);
3282
3283         ieee80211_bss_info_change_notify(sdata, changed);
3284 }
3285
3286 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3287                                   struct sk_buff *skb)
3288 {
3289         struct ieee80211_rx_status *rx_status;
3290         struct ieee80211_mgmt *mgmt;
3291         u16 fc;
3292         struct ieee802_11_elems elems;
3293         int ies_len;
3294
3295         rx_status = (struct ieee80211_rx_status *) skb->cb;
3296         mgmt = (struct ieee80211_mgmt *) skb->data;
3297         fc = le16_to_cpu(mgmt->frame_control);
3298
3299         sdata_lock(sdata);
3300
3301         switch (fc & IEEE80211_FCTL_STYPE) {
3302         case IEEE80211_STYPE_BEACON:
3303                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3304                 break;
3305         case IEEE80211_STYPE_PROBE_RESP:
3306                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3307                 break;
3308         case IEEE80211_STYPE_AUTH:
3309                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3310                 break;
3311         case IEEE80211_STYPE_DEAUTH:
3312                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3313                 break;
3314         case IEEE80211_STYPE_DISASSOC:
3315                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3316                 break;
3317         case IEEE80211_STYPE_ASSOC_RESP:
3318         case IEEE80211_STYPE_REASSOC_RESP:
3319                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3320                 break;
3321         case IEEE80211_STYPE_ACTION:
3322                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3323                         ies_len = skb->len -
3324                                   offsetof(struct ieee80211_mgmt,
3325                                            u.action.u.chan_switch.variable);
3326
3327                         if (ies_len < 0)
3328                                 break;
3329
3330                         ieee802_11_parse_elems(
3331                                 mgmt->u.action.u.chan_switch.variable,
3332                                 ies_len, true, &elems);
3333
3334                         if (elems.parse_error)
3335                                 break;
3336
3337                         ieee80211_sta_process_chanswitch(sdata,
3338                                                          rx_status->mactime,
3339                                                          &elems, false);
3340                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3341                         ies_len = skb->len -
3342                                   offsetof(struct ieee80211_mgmt,
3343                                            u.action.u.ext_chan_switch.variable);
3344
3345                         if (ies_len < 0)
3346                                 break;
3347
3348                         ieee802_11_parse_elems(
3349                                 mgmt->u.action.u.ext_chan_switch.variable,
3350                                 ies_len, true, &elems);
3351
3352                         if (elems.parse_error)
3353                                 break;
3354
3355                         /* for the handling code pretend this was also an IE */
3356                         elems.ext_chansw_ie =
3357                                 &mgmt->u.action.u.ext_chan_switch.data;
3358
3359                         ieee80211_sta_process_chanswitch(sdata,
3360                                                          rx_status->mactime,
3361                                                          &elems, false);
3362                 }
3363                 break;
3364         }
3365         sdata_unlock(sdata);
3366 }
3367
3368 static void ieee80211_sta_timer(unsigned long data)
3369 {
3370         struct ieee80211_sub_if_data *sdata =
3371                 (struct ieee80211_sub_if_data *) data;
3372
3373         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3374 }
3375
3376 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3377                                           u8 *bssid, u8 reason, bool tx)
3378 {
3379         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3380
3381         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3382                                tx, frame_buf);
3383
3384         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3385                               IEEE80211_DEAUTH_FRAME_LEN);
3386 }
3387
3388 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3389 {
3390         struct ieee80211_local *local = sdata->local;
3391         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3392         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3393         u32 tx_flags = 0;
3394
3395         sdata_assert_lock(sdata);
3396
3397         if (WARN_ON_ONCE(!auth_data))
3398                 return -EINVAL;
3399
3400         auth_data->tries++;
3401
3402         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3403                 sdata_info(sdata, "authentication with %pM timed out\n",
3404                            auth_data->bss->bssid);
3405
3406                 /*
3407                  * Most likely AP is not in the range so remove the
3408                  * bss struct for that AP.
3409                  */
3410                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3411
3412                 return -ETIMEDOUT;
3413         }
3414
3415         drv_mgd_prepare_tx(local, sdata);
3416
3417         if (auth_data->bss->proberesp_ies) {
3418                 u16 trans = 1;
3419                 u16 status = 0;
3420
3421                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3422                            auth_data->bss->bssid, auth_data->tries,
3423                            IEEE80211_AUTH_MAX_TRIES);
3424
3425                 auth_data->expected_transaction = 2;
3426
3427                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3428                         trans = auth_data->sae_trans;
3429                         status = auth_data->sae_status;
3430                         auth_data->expected_transaction = trans;
3431                 }
3432
3433                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3434                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3435                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3436
3437                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3438                                     auth_data->data, auth_data->data_len,
3439                                     auth_data->bss->bssid,
3440                                     auth_data->bss->bssid, NULL, 0, 0,
3441                                     tx_flags);
3442         } else {
3443                 const u8 *ssidie;
3444
3445                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3446                            auth_data->bss->bssid, auth_data->tries,
3447                            IEEE80211_AUTH_MAX_TRIES);
3448
3449                 rcu_read_lock();
3450                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3451                 if (!ssidie) {
3452                         rcu_read_unlock();
3453                         return -EINVAL;
3454                 }
3455                 /*
3456                  * Direct probe is sent to broadcast address as some APs
3457                  * will not answer to direct packet in unassociated state.
3458                  */
3459                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3460                                          NULL, 0, (u32) -1, true, 0,
3461                                          auth_data->bss->channel, false);
3462                 rcu_read_unlock();
3463         }
3464
3465         if (tx_flags == 0) {
3466                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3467                 auth_data->timeout_started = true;
3468                 run_again(sdata, auth_data->timeout);
3469         } else {
3470                 auth_data->timeout =
3471                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3472                 auth_data->timeout_started = true;
3473                 run_again(sdata, auth_data->timeout);
3474         }
3475
3476         return 0;
3477 }
3478
3479 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3480 {
3481         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3482         struct ieee80211_local *local = sdata->local;
3483
3484         sdata_assert_lock(sdata);
3485
3486         assoc_data->tries++;
3487         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3488                 sdata_info(sdata, "association with %pM timed out\n",
3489                            assoc_data->bss->bssid);
3490
3491                 /*
3492                  * Most likely AP is not in the range so remove the
3493                  * bss struct for that AP.
3494                  */
3495                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3496
3497                 return -ETIMEDOUT;
3498         }
3499
3500         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3501                    assoc_data->bss->bssid, assoc_data->tries,
3502                    IEEE80211_ASSOC_MAX_TRIES);
3503         ieee80211_send_assoc(sdata);
3504
3505         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3506                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3507                 assoc_data->timeout_started = true;
3508                 run_again(sdata, assoc_data->timeout);
3509         } else {
3510                 assoc_data->timeout =
3511                         round_jiffies_up(jiffies +
3512                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3513                 assoc_data->timeout_started = true;
3514                 run_again(sdata, assoc_data->timeout);
3515         }
3516
3517         return 0;
3518 }
3519
3520 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3521                                   __le16 fc, bool acked)
3522 {
3523         struct ieee80211_local *local = sdata->local;
3524
3525         sdata->u.mgd.status_fc = fc;
3526         sdata->u.mgd.status_acked = acked;
3527         sdata->u.mgd.status_received = true;
3528
3529         ieee80211_queue_work(&local->hw, &sdata->work);
3530 }
3531
3532 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3533 {
3534         struct ieee80211_local *local = sdata->local;
3535         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3536
3537         sdata_lock(sdata);
3538
3539         if (ifmgd->status_received) {
3540                 __le16 fc = ifmgd->status_fc;
3541                 bool status_acked = ifmgd->status_acked;
3542
3543                 ifmgd->status_received = false;
3544                 if (ifmgd->auth_data &&
3545                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3546                         if (status_acked) {
3547                                 ifmgd->auth_data->timeout =
3548                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3549                                 run_again(sdata, ifmgd->auth_data->timeout);
3550                         } else {
3551                                 ifmgd->auth_data->timeout = jiffies - 1;
3552                         }
3553                         ifmgd->auth_data->timeout_started = true;
3554                 } else if (ifmgd->assoc_data &&
3555                            (ieee80211_is_assoc_req(fc) ||
3556                             ieee80211_is_reassoc_req(fc))) {
3557                         if (status_acked) {
3558                                 ifmgd->assoc_data->timeout =
3559                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3560                                 run_again(sdata, ifmgd->assoc_data->timeout);
3561                         } else {
3562                                 ifmgd->assoc_data->timeout = jiffies - 1;
3563                         }
3564                         ifmgd->assoc_data->timeout_started = true;
3565                 }
3566         }
3567
3568         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3569             time_after(jiffies, ifmgd->auth_data->timeout)) {
3570                 if (ifmgd->auth_data->done) {
3571                         /*
3572                          * ok ... we waited for assoc but userspace didn't,
3573                          * so let's just kill the auth data
3574                          */
3575                         ieee80211_destroy_auth_data(sdata, false);
3576                 } else if (ieee80211_probe_auth(sdata)) {
3577                         u8 bssid[ETH_ALEN];
3578
3579                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3580
3581                         ieee80211_destroy_auth_data(sdata, false);
3582
3583                         cfg80211_auth_timeout(sdata->dev, bssid);
3584                 }
3585         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3586                 run_again(sdata, ifmgd->auth_data->timeout);
3587
3588         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3589             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3590                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3591                     ieee80211_do_assoc(sdata)) {
3592                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3593
3594                         ieee80211_destroy_assoc_data(sdata, false);
3595                         cfg80211_assoc_timeout(sdata->dev, bss);
3596                 }
3597         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3598                 run_again(sdata, ifmgd->assoc_data->timeout);
3599
3600         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3601             ifmgd->associated) {
3602                 u8 bssid[ETH_ALEN];
3603                 int max_tries;
3604
3605                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3606
3607                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3608                         max_tries = max_nullfunc_tries;
3609                 else
3610                         max_tries = max_probe_tries;
3611
3612                 /* ACK received for nullfunc probing frame */
3613                 if (!ifmgd->probe_send_count)
3614                         ieee80211_reset_ap_probe(sdata);
3615                 else if (ifmgd->nullfunc_failed) {
3616                         if (ifmgd->probe_send_count < max_tries) {
3617                                 mlme_dbg(sdata,
3618                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3619                                          bssid, ifmgd->probe_send_count,
3620                                          max_tries);
3621                                 ieee80211_mgd_probe_ap_send(sdata);
3622                         } else {
3623                                 mlme_dbg(sdata,
3624                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3625                                          bssid);
3626                                 ieee80211_sta_connection_lost(sdata, bssid,
3627                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3628                                         false);
3629                         }
3630                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3631                         run_again(sdata, ifmgd->probe_timeout);
3632                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3633                         mlme_dbg(sdata,
3634                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3635                                  bssid, probe_wait_ms);
3636                         ieee80211_sta_connection_lost(sdata, bssid,
3637                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3638                 } else if (ifmgd->probe_send_count < max_tries) {
3639                         mlme_dbg(sdata,
3640                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3641                                  bssid, probe_wait_ms,
3642                                  ifmgd->probe_send_count, max_tries);
3643                         ieee80211_mgd_probe_ap_send(sdata);
3644                 } else {
3645                         /*
3646                          * We actually lost the connection ... or did we?
3647                          * Let's make sure!
3648                          */
3649                         wiphy_debug(local->hw.wiphy,
3650                                     "%s: No probe response from AP %pM"
3651                                     " after %dms, disconnecting.\n",
3652                                     sdata->name,
3653                                     bssid, probe_wait_ms);
3654
3655                         ieee80211_sta_connection_lost(sdata, bssid,
3656                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3657                 }
3658         }
3659
3660         sdata_unlock(sdata);
3661 }
3662
3663 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3664 {
3665         struct ieee80211_sub_if_data *sdata =
3666                 (struct ieee80211_sub_if_data *) data;
3667         struct ieee80211_local *local = sdata->local;
3668
3669         if (local->quiescing)
3670                 return;
3671
3672         if (sdata->vif.csa_active)
3673                 return;
3674
3675         sdata->u.mgd.connection_loss = false;
3676         ieee80211_queue_work(&sdata->local->hw,
3677                              &sdata->u.mgd.beacon_connection_loss_work);
3678 }
3679
3680 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3681 {
3682         struct ieee80211_sub_if_data *sdata =
3683                 (struct ieee80211_sub_if_data *) data;
3684         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3685         struct ieee80211_local *local = sdata->local;
3686
3687         if (local->quiescing)
3688                 return;
3689
3690         if (sdata->vif.csa_active)
3691                 return;
3692
3693         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3694 }
3695
3696 static void ieee80211_sta_monitor_work(struct work_struct *work)
3697 {
3698         struct ieee80211_sub_if_data *sdata =
3699                 container_of(work, struct ieee80211_sub_if_data,
3700                              u.mgd.monitor_work);
3701
3702         ieee80211_mgd_probe_ap(sdata, false);
3703 }
3704
3705 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3706 {
3707         u32 flags;
3708
3709         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3710                 __ieee80211_stop_poll(sdata);
3711
3712                 /* let's probe the connection once */
3713                 flags = sdata->local->hw.flags;
3714                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3715                         ieee80211_queue_work(&sdata->local->hw,
3716                                              &sdata->u.mgd.monitor_work);
3717                 /* and do all the other regular work too */
3718                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3719         }
3720 }
3721
3722 #ifdef CONFIG_PM
3723 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3724 {
3725         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3726         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3727
3728         sdata_lock(sdata);
3729
3730         if (ifmgd->auth_data || ifmgd->assoc_data) {
3731                 const u8 *bssid = ifmgd->auth_data ?
3732                                 ifmgd->auth_data->bss->bssid :
3733                                 ifmgd->assoc_data->bss->bssid;
3734
3735                 /*
3736                  * If we are trying to authenticate / associate while suspending,
3737                  * cfg80211 won't know and won't actually abort those attempts,
3738                  * thus we need to do that ourselves.
3739                  */
3740                 ieee80211_send_deauth_disassoc(sdata, bssid,
3741                                                IEEE80211_STYPE_DEAUTH,
3742                                                WLAN_REASON_DEAUTH_LEAVING,
3743                                                false, frame_buf);
3744                 if (ifmgd->assoc_data)
3745                         ieee80211_destroy_assoc_data(sdata, false);
3746                 if (ifmgd->auth_data)
3747                         ieee80211_destroy_auth_data(sdata, false);
3748                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3749                                       IEEE80211_DEAUTH_FRAME_LEN);
3750         }
3751
3752         sdata_unlock(sdata);
3753 }
3754
3755 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3756 {
3757         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3758
3759         sdata_lock(sdata);
3760         if (!ifmgd->associated) {
3761                 sdata_unlock(sdata);
3762                 return;
3763         }
3764
3765         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3766                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3767                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3768                 ieee80211_sta_connection_lost(sdata,
3769                                               ifmgd->associated->bssid,
3770                                               WLAN_REASON_UNSPECIFIED,
3771                                               true);
3772                 sdata_unlock(sdata);
3773                 return;
3774         }
3775         sdata_unlock(sdata);
3776 }
3777 #endif
3778
3779 /* interface setup */
3780 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3781 {
3782         struct ieee80211_if_managed *ifmgd;
3783
3784         ifmgd = &sdata->u.mgd;
3785         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3786         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3787         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3788                   ieee80211_beacon_connection_loss_work);
3789         INIT_WORK(&ifmgd->csa_connection_drop_work,
3790                   ieee80211_csa_connection_drop_work);
3791         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3792         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
3793                           ieee80211_tdls_peer_del_work);
3794         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3795                     (unsigned long) sdata);
3796         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3797                     (unsigned long) sdata);
3798         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3799                     (unsigned long) sdata);
3800         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3801                     (unsigned long) sdata);
3802
3803         ifmgd->flags = 0;
3804         ifmgd->powersave = sdata->wdev.ps;
3805         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3806         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3807         ifmgd->p2p_noa_index = -1;
3808
3809         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
3810                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3811         else
3812                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3813 }
3814
3815 /* scan finished notification */
3816 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3817 {
3818         struct ieee80211_sub_if_data *sdata;
3819
3820         /* Restart STA timers */
3821         rcu_read_lock();
3822         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3823                 if (ieee80211_sdata_running(sdata))
3824                         ieee80211_restart_sta_timer(sdata);
3825         }
3826         rcu_read_unlock();
3827 }
3828
3829 int ieee80211_max_network_latency(struct notifier_block *nb,
3830                                   unsigned long data, void *dummy)
3831 {
3832         s32 latency_usec = (s32) data;
3833         struct ieee80211_local *local =
3834                 container_of(nb, struct ieee80211_local,
3835                              network_latency_notifier);
3836
3837         mutex_lock(&local->iflist_mtx);
3838         ieee80211_recalc_ps(local, latency_usec);
3839         mutex_unlock(&local->iflist_mtx);
3840
3841         return NOTIFY_OK;
3842 }
3843
3844 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3845                                      struct cfg80211_bss *cbss)
3846 {
3847         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3848         const u8 *ht_cap_ie, *vht_cap_ie;
3849         const struct ieee80211_ht_cap *ht_cap;
3850         const struct ieee80211_vht_cap *vht_cap;
3851         u8 chains = 1;
3852
3853         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3854                 return chains;
3855
3856         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3857         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3858                 ht_cap = (void *)(ht_cap_ie + 2);
3859                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3860                 /*
3861                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3862                  *       "Tx Unequal Modulation Supported" fields.
3863                  */
3864         }
3865
3866         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3867                 return chains;
3868
3869         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3870         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3871                 u8 nss;
3872                 u16 tx_mcs_map;
3873
3874                 vht_cap = (void *)(vht_cap_ie + 2);
3875                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3876                 for (nss = 8; nss > 0; nss--) {
3877                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3878                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3879                                 break;
3880                 }
3881                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3882                 chains = max(chains, nss);
3883         }
3884
3885         return chains;
3886 }
3887
3888 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3889                                   struct cfg80211_bss *cbss)
3890 {
3891         struct ieee80211_local *local = sdata->local;
3892         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3893         const struct ieee80211_ht_cap *ht_cap = NULL;
3894         const struct ieee80211_ht_operation *ht_oper = NULL;
3895         const struct ieee80211_vht_operation *vht_oper = NULL;
3896         struct ieee80211_supported_band *sband;
3897         struct cfg80211_chan_def chandef;
3898         int ret;
3899
3900         sband = local->hw.wiphy->bands[cbss->channel->band];
3901
3902         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3903                           IEEE80211_STA_DISABLE_80P80MHZ |
3904                           IEEE80211_STA_DISABLE_160MHZ);
3905
3906         rcu_read_lock();
3907
3908         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3909             sband->ht_cap.ht_supported) {
3910                 const u8 *ht_oper_ie, *ht_cap_ie;
3911
3912                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3913                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3914                         ht_oper = (void *)(ht_oper_ie + 2);
3915
3916                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3917                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
3918                         ht_cap = (void *)(ht_cap_ie + 2);
3919
3920                 if (!ht_cap) {
3921                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3922                         ht_oper = NULL;
3923                 }
3924         }
3925
3926         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3927             sband->vht_cap.vht_supported) {
3928                 const u8 *vht_oper_ie, *vht_cap;
3929
3930                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3931                                                    WLAN_EID_VHT_OPERATION);
3932                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3933                         vht_oper = (void *)(vht_oper_ie + 2);
3934                 if (vht_oper && !ht_oper) {
3935                         vht_oper = NULL;
3936                         sdata_info(sdata,
3937                                    "AP advertised VHT without HT, disabling both\n");
3938                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3939                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3940                 }
3941
3942                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3943                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3944                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3945                         vht_oper = NULL;
3946                 }
3947         }
3948
3949         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3950                                                      cbss->channel,
3951                                                      ht_cap, ht_oper, vht_oper,
3952                                                      &chandef, false);
3953
3954         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3955                                       local->rx_chains);
3956
3957         rcu_read_unlock();
3958
3959         /* will change later if needed */
3960         sdata->smps_mode = IEEE80211_SMPS_OFF;
3961
3962         mutex_lock(&local->mtx);
3963         /*
3964          * If this fails (possibly due to channel context sharing
3965          * on incompatible channels, e.g. 80+80 and 160 sharing the
3966          * same control channel) try to use a smaller bandwidth.
3967          */
3968         ret = ieee80211_vif_use_channel(sdata, &chandef,
3969                                         IEEE80211_CHANCTX_SHARED);
3970
3971         /* don't downgrade for 5 and 10 MHz channels, though. */
3972         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3973             chandef.width == NL80211_CHAN_WIDTH_10)
3974                 goto out;
3975
3976         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3977                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3978                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3979                                                 IEEE80211_CHANCTX_SHARED);
3980         }
3981  out:
3982         mutex_unlock(&local->mtx);
3983         return ret;
3984 }
3985
3986 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3987                                      struct cfg80211_bss *cbss, bool assoc)
3988 {
3989         struct ieee80211_local *local = sdata->local;
3990         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3991         struct ieee80211_bss *bss = (void *)cbss->priv;
3992         struct sta_info *new_sta = NULL;
3993         bool have_sta = false;
3994         int err;
3995
3996         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3997                 return -EINVAL;
3998
3999         if (assoc) {
4000                 rcu_read_lock();
4001                 have_sta = sta_info_get(sdata, cbss->bssid);
4002                 rcu_read_unlock();
4003         }
4004
4005         if (!have_sta) {
4006                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4007                 if (!new_sta)
4008                         return -ENOMEM;
4009         }
4010         if (new_sta) {
4011                 u32 rates = 0, basic_rates = 0;
4012                 bool have_higher_than_11mbit;
4013                 int min_rate = INT_MAX, min_rate_index = -1;
4014                 struct ieee80211_chanctx_conf *chanctx_conf;
4015                 struct ieee80211_supported_band *sband;
4016                 const struct cfg80211_bss_ies *ies;
4017                 int shift;
4018                 u32 rate_flags;
4019
4020                 sband = local->hw.wiphy->bands[cbss->channel->band];
4021
4022                 err = ieee80211_prep_channel(sdata, cbss);
4023                 if (err) {
4024                         sta_info_free(local, new_sta);
4025                         return -EINVAL;
4026                 }
4027                 shift = ieee80211_vif_get_shift(&sdata->vif);
4028
4029                 rcu_read_lock();
4030                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4031                 if (WARN_ON(!chanctx_conf)) {
4032                         rcu_read_unlock();
4033                         sta_info_free(local, new_sta);
4034                         return -EINVAL;
4035                 }
4036                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4037                 rcu_read_unlock();
4038
4039                 ieee80211_get_rates(sband, bss->supp_rates,
4040                                     bss->supp_rates_len,
4041                                     &rates, &basic_rates,
4042                                     &have_higher_than_11mbit,
4043                                     &min_rate, &min_rate_index,
4044                                     shift, rate_flags);
4045
4046                 /*
4047                  * This used to be a workaround for basic rates missing
4048                  * in the association response frame. Now that we no
4049                  * longer use the basic rates from there, it probably
4050                  * doesn't happen any more, but keep the workaround so
4051                  * in case some *other* APs are buggy in different ways
4052                  * we can connect -- with a warning.
4053                  */
4054                 if (!basic_rates && min_rate_index >= 0) {
4055                         sdata_info(sdata,
4056                                    "No basic rates, using min rate instead\n");
4057                         basic_rates = BIT(min_rate_index);
4058                 }
4059
4060                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4061                 sdata->vif.bss_conf.basic_rates = basic_rates;
4062
4063                 /* cf. IEEE 802.11 9.2.12 */
4064                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4065                     have_higher_than_11mbit)
4066                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4067                 else
4068                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4069
4070                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4071
4072                 /* set timing information */
4073                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4074                 rcu_read_lock();
4075                 ies = rcu_dereference(cbss->beacon_ies);
4076                 if (ies) {
4077                         const u8 *tim_ie;
4078
4079                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4080                         sdata->vif.bss_conf.sync_device_ts =
4081                                 bss->device_ts_beacon;
4082                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4083                                                   ies->data, ies->len);
4084                         if (tim_ie && tim_ie[1] >= 2)
4085                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4086                         else
4087                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4088                 } else if (!(local->hw.flags &
4089                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4090                         ies = rcu_dereference(cbss->proberesp_ies);
4091                         /* must be non-NULL since beacon IEs were NULL */
4092                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4093                         sdata->vif.bss_conf.sync_device_ts =
4094                                 bss->device_ts_presp;
4095                         sdata->vif.bss_conf.sync_dtim_count = 0;
4096                 } else {
4097                         sdata->vif.bss_conf.sync_tsf = 0;
4098                         sdata->vif.bss_conf.sync_device_ts = 0;
4099                         sdata->vif.bss_conf.sync_dtim_count = 0;
4100                 }
4101                 rcu_read_unlock();
4102
4103                 /* tell driver about BSSID, basic rates and timing */
4104                 ieee80211_bss_info_change_notify(sdata,
4105                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4106                         BSS_CHANGED_BEACON_INT);
4107
4108                 if (assoc)
4109                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4110
4111                 err = sta_info_insert(new_sta);
4112                 new_sta = NULL;
4113                 if (err) {
4114                         sdata_info(sdata,
4115                                    "failed to insert STA entry for the AP (error %d)\n",
4116                                    err);
4117                         return err;
4118                 }
4119         } else
4120                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4121
4122         return 0;
4123 }
4124
4125 /* config hooks */
4126 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4127                        struct cfg80211_auth_request *req)
4128 {
4129         struct ieee80211_local *local = sdata->local;
4130         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4131         struct ieee80211_mgd_auth_data *auth_data;
4132         u16 auth_alg;
4133         int err;
4134
4135         /* prepare auth data structure */
4136
4137         switch (req->auth_type) {
4138         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4139                 auth_alg = WLAN_AUTH_OPEN;
4140                 break;
4141         case NL80211_AUTHTYPE_SHARED_KEY:
4142                 if (IS_ERR(local->wep_tx_tfm))
4143                         return -EOPNOTSUPP;
4144                 auth_alg = WLAN_AUTH_SHARED_KEY;
4145                 break;
4146         case NL80211_AUTHTYPE_FT:
4147                 auth_alg = WLAN_AUTH_FT;
4148                 break;
4149         case NL80211_AUTHTYPE_NETWORK_EAP:
4150                 auth_alg = WLAN_AUTH_LEAP;
4151                 break;
4152         case NL80211_AUTHTYPE_SAE:
4153                 auth_alg = WLAN_AUTH_SAE;
4154                 break;
4155         default:
4156                 return -EOPNOTSUPP;
4157         }
4158
4159         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4160                             req->ie_len, GFP_KERNEL);
4161         if (!auth_data)
4162                 return -ENOMEM;
4163
4164         auth_data->bss = req->bss;
4165
4166         if (req->sae_data_len >= 4) {
4167                 __le16 *pos = (__le16 *) req->sae_data;
4168                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4169                 auth_data->sae_status = le16_to_cpu(pos[1]);
4170                 memcpy(auth_data->data, req->sae_data + 4,
4171                        req->sae_data_len - 4);
4172                 auth_data->data_len += req->sae_data_len - 4;
4173         }
4174
4175         if (req->ie && req->ie_len) {
4176                 memcpy(&auth_data->data[auth_data->data_len],
4177                        req->ie, req->ie_len);
4178                 auth_data->data_len += req->ie_len;
4179         }
4180
4181         if (req->key && req->key_len) {
4182                 auth_data->key_len = req->key_len;
4183                 auth_data->key_idx = req->key_idx;
4184                 memcpy(auth_data->key, req->key, req->key_len);
4185         }
4186
4187         auth_data->algorithm = auth_alg;
4188
4189         /* try to authenticate/probe */
4190
4191         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4192             ifmgd->assoc_data) {
4193                 err = -EBUSY;
4194                 goto err_free;
4195         }
4196
4197         if (ifmgd->auth_data)
4198                 ieee80211_destroy_auth_data(sdata, false);
4199
4200         /* prep auth_data so we don't go into idle on disassoc */
4201         ifmgd->auth_data = auth_data;
4202
4203         if (ifmgd->associated) {
4204                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4205
4206                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4207                                        WLAN_REASON_UNSPECIFIED,
4208                                        false, frame_buf);
4209
4210                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4211                                       sizeof(frame_buf));
4212         }
4213
4214         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4215
4216         err = ieee80211_prep_connection(sdata, req->bss, false);
4217         if (err)
4218                 goto err_clear;
4219
4220         err = ieee80211_probe_auth(sdata);
4221         if (err) {
4222                 sta_info_destroy_addr(sdata, req->bss->bssid);
4223                 goto err_clear;
4224         }
4225
4226         /* hold our own reference */
4227         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4228         return 0;
4229
4230  err_clear:
4231         memset(ifmgd->bssid, 0, ETH_ALEN);
4232         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4233         ifmgd->auth_data = NULL;
4234  err_free:
4235         kfree(auth_data);
4236         return err;
4237 }
4238
4239 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4240                                         const u8 *wmm_param, int len)
4241 {
4242         const u8 *pos;
4243         size_t left;
4244
4245         if (len < 8)
4246                 return false;
4247
4248         if (wmm_param[5] != 1 /* version */)
4249                 return false;
4250
4251         pos = wmm_param + 8;
4252         left = len - 8;
4253
4254         for (; left >= 4; left -= 4, pos += 4) {
4255                 u8 aifsn = pos[0] & 0x0f;
4256                 u8 ecwmin = pos[1] & 0x0f;
4257                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4258                 int aci = (pos[0] >> 5) & 0x03;
4259
4260                 if (aifsn < 2) {
4261                         sdata_info(sdata,
4262                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4263                                    aifsn, aci);
4264                         return false;
4265                 }
4266                 if (ecwmin > ecwmax) {
4267                         sdata_info(sdata,
4268                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4269                                    ecwmin, ecwmax, aci);
4270                         return false;
4271                 }
4272         }
4273
4274         return true;
4275 }
4276
4277 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4278                         struct cfg80211_assoc_request *req)
4279 {
4280         struct ieee80211_local *local = sdata->local;
4281         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4282         struct ieee80211_bss *bss = (void *)req->bss->priv;
4283         struct ieee80211_mgd_assoc_data *assoc_data;
4284         const struct cfg80211_bss_ies *beacon_ies;
4285         struct ieee80211_supported_band *sband;
4286         const u8 *ssidie, *ht_ie, *vht_ie;
4287         int i, err;
4288
4289         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4290         if (!assoc_data)
4291                 return -ENOMEM;
4292
4293         rcu_read_lock();
4294         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4295         if (!ssidie) {
4296                 rcu_read_unlock();
4297                 kfree(assoc_data);
4298                 return -EINVAL;
4299         }
4300         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4301         assoc_data->ssid_len = ssidie[1];
4302         rcu_read_unlock();
4303
4304         if (ifmgd->associated) {
4305                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4306
4307                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4308                                        WLAN_REASON_UNSPECIFIED,
4309                                        false, frame_buf);
4310
4311                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4312                                       sizeof(frame_buf));
4313         }
4314
4315         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4316                 err = -EBUSY;
4317                 goto err_free;
4318         }
4319
4320         if (ifmgd->assoc_data) {
4321                 err = -EBUSY;
4322                 goto err_free;
4323         }
4324
4325         if (ifmgd->auth_data) {
4326                 bool match;
4327
4328                 /* keep sta info, bssid if matching */
4329                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4330                 ieee80211_destroy_auth_data(sdata, match);
4331         }
4332
4333         /* prepare assoc data */
4334
4335         ifmgd->beacon_crc_valid = false;
4336
4337         assoc_data->wmm = bss->wmm_used &&
4338                           (local->hw.queues >= IEEE80211_NUM_ACS);
4339         if (assoc_data->wmm) {
4340                 /* try to check validity of WMM params IE */
4341                 const struct cfg80211_bss_ies *ies;
4342                 const u8 *wp, *start, *end;
4343
4344                 rcu_read_lock();
4345                 ies = rcu_dereference(req->bss->ies);
4346                 start = ies->data;
4347                 end = start + ies->len;
4348
4349                 while (true) {
4350                         wp = cfg80211_find_vendor_ie(
4351                                 WLAN_OUI_MICROSOFT,
4352                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4353                                 start, end - start);
4354                         if (!wp)
4355                                 break;
4356                         start = wp + wp[1] + 2;
4357                         /* if this IE is too short, try the next */
4358                         if (wp[1] <= 4)
4359                                 continue;
4360                         /* if this IE is WMM params, we found what we wanted */
4361                         if (wp[6] == 1)
4362                                 break;
4363                 }
4364
4365                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4366                                                         wp[1] - 2)) {
4367                         assoc_data->wmm = false;
4368                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4369                 }
4370                 rcu_read_unlock();
4371         }
4372
4373         /*
4374          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4375          * We still associate in non-HT mode (11a/b/g) if any one of these
4376          * ciphers is configured as pairwise.
4377          * We can set this to true for non-11n hardware, that'll be checked
4378          * separately along with the peer capabilities.
4379          */
4380         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4381                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4382                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4383                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4384                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4385                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4386                         netdev_info(sdata->dev,
4387                                     "disabling HT/VHT due to WEP/TKIP use\n");
4388                 }
4389         }
4390
4391         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4392                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4393                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4394         }
4395
4396         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4397                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4398
4399         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4400         sband = local->hw.wiphy->bands[req->bss->channel->band];
4401         if (!sband->ht_cap.ht_supported ||
4402             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4403             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4404                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4405                 if (!bss->wmm_used &&
4406                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4407                         netdev_info(sdata->dev,
4408                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4409         }
4410
4411         /* disable VHT if we don't support it or the AP doesn't use WMM */
4412         if (!sband->vht_cap.vht_supported ||
4413             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4414             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4415                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4416                 if (!bss->wmm_used &&
4417                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4418                         netdev_info(sdata->dev,
4419                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4420         }
4421
4422         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4423         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4424                sizeof(ifmgd->ht_capa_mask));
4425
4426         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4427         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4428                sizeof(ifmgd->vht_capa_mask));
4429
4430         if (req->ie && req->ie_len) {
4431                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4432                 assoc_data->ie_len = req->ie_len;
4433         }
4434
4435         assoc_data->bss = req->bss;
4436
4437         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4438                 if (ifmgd->powersave)
4439                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4440                 else
4441                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4442         } else
4443                 sdata->smps_mode = ifmgd->req_smps;
4444
4445         assoc_data->capability = req->bss->capability;
4446         assoc_data->supp_rates = bss->supp_rates;
4447         assoc_data->supp_rates_len = bss->supp_rates_len;
4448
4449         rcu_read_lock();
4450         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4451         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4452                 assoc_data->ap_ht_param =
4453                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4454         else
4455                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4456         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4457         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4458                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4459                        sizeof(struct ieee80211_vht_cap));
4460         else
4461                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4462         rcu_read_unlock();
4463
4464         if (bss->wmm_used && bss->uapsd_supported &&
4465             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4466                 assoc_data->uapsd = true;
4467                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4468         } else {
4469                 assoc_data->uapsd = false;
4470                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4471         }
4472
4473         if (req->prev_bssid)
4474                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4475
4476         if (req->use_mfp) {
4477                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4478                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4479         } else {
4480                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4481                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4482         }
4483
4484         if (req->flags & ASSOC_REQ_USE_RRM)
4485                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4486         else
4487                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4488
4489         if (req->crypto.control_port)
4490                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4491         else
4492                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4493
4494         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4495         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4496         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4497                                                         sdata->vif.type);
4498
4499         /* kick off associate process */
4500
4501         ifmgd->assoc_data = assoc_data;
4502         ifmgd->dtim_period = 0;
4503         ifmgd->have_beacon = false;
4504
4505         err = ieee80211_prep_connection(sdata, req->bss, true);
4506         if (err)
4507                 goto err_clear;
4508
4509         rcu_read_lock();
4510         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4511
4512         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4513             !beacon_ies) {
4514                 /*
4515                  * Wait up to one beacon interval ...
4516                  * should this be more if we miss one?
4517                  */
4518                 sdata_info(sdata, "waiting for beacon from %pM\n",
4519                            ifmgd->bssid);
4520                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4521                 assoc_data->timeout_started = true;
4522                 assoc_data->need_beacon = true;
4523         } else if (beacon_ies) {
4524                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4525                                                     beacon_ies->data,
4526                                                     beacon_ies->len);
4527                 u8 dtim_count = 0;
4528
4529                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4530                         const struct ieee80211_tim_ie *tim;
4531                         tim = (void *)(tim_ie + 2);
4532                         ifmgd->dtim_period = tim->dtim_period;
4533                         dtim_count = tim->dtim_count;
4534                 }
4535                 ifmgd->have_beacon = true;
4536                 assoc_data->timeout = jiffies;
4537                 assoc_data->timeout_started = true;
4538
4539                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4540                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4541                         sdata->vif.bss_conf.sync_device_ts =
4542                                 bss->device_ts_beacon;
4543                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4544                 }
4545         } else {
4546                 assoc_data->timeout = jiffies;
4547                 assoc_data->timeout_started = true;
4548         }
4549         rcu_read_unlock();
4550
4551         run_again(sdata, assoc_data->timeout);
4552
4553         if (bss->corrupt_data) {
4554                 char *corrupt_type = "data";
4555                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4556                         if (bss->corrupt_data &
4557                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4558                                 corrupt_type = "beacon and probe response";
4559                         else
4560                                 corrupt_type = "beacon";
4561                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4562                         corrupt_type = "probe response";
4563                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4564                            corrupt_type);
4565         }
4566
4567         return 0;
4568  err_clear:
4569         memset(ifmgd->bssid, 0, ETH_ALEN);
4570         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4571         ifmgd->assoc_data = NULL;
4572  err_free:
4573         kfree(assoc_data);
4574         return err;
4575 }
4576
4577 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4578                          struct cfg80211_deauth_request *req)
4579 {
4580         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4581         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4582         bool tx = !req->local_state_change;
4583
4584         if (ifmgd->auth_data &&
4585             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4586                 sdata_info(sdata,
4587                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4588                            req->bssid, req->reason_code,
4589                            ieee80211_get_reason_code_string(req->reason_code));
4590
4591                 drv_mgd_prepare_tx(sdata->local, sdata);
4592                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4593                                                IEEE80211_STYPE_DEAUTH,
4594                                                req->reason_code, tx,
4595                                                frame_buf);
4596                 ieee80211_destroy_auth_data(sdata, false);
4597                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4598                                       IEEE80211_DEAUTH_FRAME_LEN);
4599
4600                 return 0;
4601         }
4602
4603         if (ifmgd->associated &&
4604             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4605                 sdata_info(sdata,
4606                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4607                            req->bssid, req->reason_code,
4608                            ieee80211_get_reason_code_string(req->reason_code));
4609
4610                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4611                                        req->reason_code, tx, frame_buf);
4612                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4613                                       IEEE80211_DEAUTH_FRAME_LEN);
4614                 return 0;
4615         }
4616
4617         return -ENOTCONN;
4618 }
4619
4620 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4621                            struct cfg80211_disassoc_request *req)
4622 {
4623         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4624         u8 bssid[ETH_ALEN];
4625         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4626
4627         /*
4628          * cfg80211 should catch this ... but it's racy since
4629          * we can receive a disassoc frame, process it, hand it
4630          * to cfg80211 while that's in a locked section already
4631          * trying to tell us that the user wants to disconnect.
4632          */
4633         if (ifmgd->associated != req->bss)
4634                 return -ENOLINK;
4635
4636         sdata_info(sdata,
4637                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4638                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4639
4640         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4641         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4642                                req->reason_code, !req->local_state_change,
4643                                frame_buf);
4644
4645         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4646                               IEEE80211_DEAUTH_FRAME_LEN);
4647
4648         return 0;
4649 }
4650
4651 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4652 {
4653         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4654
4655         /*
4656          * Make sure some work items will not run after this,
4657          * they will not do anything but might not have been
4658          * cancelled when disconnecting.
4659          */
4660         cancel_work_sync(&ifmgd->monitor_work);
4661         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4662         cancel_work_sync(&ifmgd->request_smps_work);
4663         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4664         cancel_work_sync(&ifmgd->chswitch_work);
4665         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4666
4667         sdata_lock(sdata);
4668         if (ifmgd->assoc_data) {
4669                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4670                 ieee80211_destroy_assoc_data(sdata, false);
4671                 cfg80211_assoc_timeout(sdata->dev, bss);
4672         }
4673         if (ifmgd->auth_data)
4674                 ieee80211_destroy_auth_data(sdata, false);
4675         del_timer_sync(&ifmgd->timer);
4676         sdata_unlock(sdata);
4677 }
4678
4679 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4680                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4681                                gfp_t gfp)
4682 {
4683         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4684
4685         trace_api_cqm_rssi_notify(sdata, rssi_event);
4686
4687         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4688 }
4689 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);