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_FAST_BSS_TRANSITION,   /* reassoc only */
 779                         WLAN_EID_RIC_DATA,              /* reassoc only */
 780                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 781                 };
 782                 static const u8 after_ric[] = {
 783                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 784                         WLAN_EID_HT_CAPABILITY,
 785                         WLAN_EID_BSS_COEX_2040,
 786                         WLAN_EID_EXT_CAPABILITY,
 787                         WLAN_EID_QOS_TRAFFIC_CAPA,
 788                         WLAN_EID_TIM_BCAST_REQ,
 789                         WLAN_EID_INTERWORKING,
 790                         /* 60GHz doesn't happen right now */
 791                         WLAN_EID_VHT_CAPABILITY,
 792                         WLAN_EID_OPMODE_NOTIF,
 793                 };
 794
 795                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 796                                                  assoc_data->ie_len,
 797                                                  before_ht,
 798                                                  ARRAY_SIZE(before_ht),
 799                                                  after_ric,
 800                                                  ARRAY_SIZE(after_ric),
 801                                                  offset);
 802                 pos = skb_put(skb, noffset - offset);
 803                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 804                 offset = noffset;
 805         }
 806
 807         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 808                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 809                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 810
 811         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 812                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 813                                     sband, chan, sdata->smps_mode);
 814
 815         /* if present, add any custom IEs that go before VHT */
 816         if (assoc_data->ie_len) {
 817                 static const u8 before_vht[] = {
 818                         WLAN_EID_SSID,
 819                         WLAN_EID_SUPP_RATES,
 820                         WLAN_EID_EXT_SUPP_RATES,
 821                         WLAN_EID_PWR_CAPABILITY,
 822                         WLAN_EID_SUPPORTED_CHANNELS,
 823                         WLAN_EID_RSN,
 824                         WLAN_EID_QOS_CAPA,
 825                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 826                         WLAN_EID_MOBILITY_DOMAIN,
 827                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 828                         WLAN_EID_HT_CAPABILITY,
 829                         WLAN_EID_BSS_COEX_2040,
 830                         WLAN_EID_EXT_CAPABILITY,
 831                         WLAN_EID_QOS_TRAFFIC_CAPA,
 832                         WLAN_EID_TIM_BCAST_REQ,
 833                         WLAN_EID_INTERWORKING,
 834                 };
 835
 836                 /* RIC already taken above, so no need to handle here anymore */
 837                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 838                                              before_vht, ARRAY_SIZE(before_vht),
 839                                              offset);
 840                 pos = skb_put(skb, noffset - offset);
 841                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 842                 offset = noffset;
 843         }
 844
 845         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 846                 ieee80211_add_vht_ie(sdata, skb, sband,
 847                                      &assoc_data->ap_vht_cap);
 848
 849         /* if present, add any custom non-vendor IEs that go after HT */
 850         if (assoc_data->ie_len) {
 851                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 852                                                     assoc_data->ie_len,
 853                                                     offset);
 854                 pos = skb_put(skb, noffset - offset);
 855                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 856                 offset = noffset;
 857         }
 858
 859         if (assoc_data->wmm) {
 860                 if (assoc_data->uapsd) {
 861                         qos_info = ifmgd->uapsd_queues;
 862                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 863                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 864                 } else {
 865                         qos_info = 0;
 866                 }
 867
 868                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 869         }
 870
 871         /* add any remaining custom (i.e. vendor specific here) IEs */
 872         if (assoc_data->ie_len) {
 873                 noffset = assoc_data->ie_len;
 874                 pos = skb_put(skb, noffset - offset);
 875                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 876         }
 877
 878         drv_mgd_prepare_tx(local, sdata);
 879
 880         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 881         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 882                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 883                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 884         ieee80211_tx_skb(sdata, skb);
 885 }
 886
 887 void ieee80211_send_pspoll(struct ieee80211_local *local,
 888                            struct ieee80211_sub_if_data *sdata)
 889 {
 890         struct ieee80211_pspoll *pspoll;
 891         struct sk_buff *skb;
 892
 893         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 894         if (!skb)
 895                 return;
 896
 897         pspoll = (struct ieee80211_pspoll *) skb->data;
 898         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 899
 900         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 901         ieee80211_tx_skb(sdata, skb);
 902 }
 903
 904 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 905                              struct ieee80211_sub_if_data *sdata,
 906                              int powersave)
 907 {
 908         struct sk_buff *skb;
 909         struct ieee80211_hdr_3addr *nullfunc;
 910         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 911
 912         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 913         if (!skb)
 914                 return;
 915
 916         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 917         if (powersave)
 918                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 919
 920         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 921                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 922
 923         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 924                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 925
 926         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 927                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 928
 929         ieee80211_tx_skb(sdata, skb);
 930 }
 931
 932 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 933                                           struct ieee80211_sub_if_data *sdata)
 934 {
 935         struct sk_buff *skb;
 936         struct ieee80211_hdr *nullfunc;
 937         __le16 fc;
 938
 939         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 940                 return;
 941
 942         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 943         if (!skb)
 944                 return;
 945
 946         skb_reserve(skb, local->hw.extra_tx_headroom);
 947
 948         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 949         memset(nullfunc, 0, 30);
 950         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 951                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 952         nullfunc->frame_control = fc;
 953         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 954         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 955         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 956         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 957
 958         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 959         ieee80211_tx_skb(sdata, skb);
 960 }
 961
 962 /* spectrum management related things */
 963 static void ieee80211_chswitch_work(struct work_struct *work)
 964 {
 965         struct ieee80211_sub_if_data *sdata =
 966                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 967         struct ieee80211_local *local = sdata->local;
 968         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 969         int ret;
 970
 971         if (!ieee80211_sdata_running(sdata))
 972                 return;
 973
 974         sdata_lock(sdata);
 975         mutex_lock(&local->mtx);
 976         mutex_lock(&local->chanctx_mtx);
 977
 978         if (!ifmgd->associated)
 979                 goto out;
 980
 981         if (!sdata->vif.csa_active)
 982                 goto out;
 983
 984         /*
 985          * using reservation isn't immediate as it may be deferred until later
 986          * with multi-vif. once reservation is complete it will re-schedule the
 987          * work with no reserved_chanctx so verify chandef to check if it
 988          * completed successfully
 989          */
 990
 991         if (sdata->reserved_chanctx) {
 992                 /*
 993                  * with multi-vif csa driver may call ieee80211_csa_finish()
 994                  * many times while waiting for other interfaces to use their
 995                  * reservations
 996                  */
 997                 if (sdata->reserved_ready)
 998                         goto out;
 999
1000                 ret = ieee80211_vif_use_reserved_context(sdata);
1001                 if (ret) {
1002                         sdata_info(sdata,
1003                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1004                                    ret);
1005                         ieee80211_queue_work(&sdata->local->hw,
1006                                              &ifmgd->csa_connection_drop_work);
1007                         goto out;
1008                 }
1009
1010                 goto out;
1011         }
1012
1013         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1014                                         &sdata->csa_chandef)) {
1015                 sdata_info(sdata,
1016                            "failed to finalize channel switch, disconnecting\n");
1017                 ieee80211_queue_work(&sdata->local->hw,
1018                                      &ifmgd->csa_connection_drop_work);
1019                 goto out;
1020         }
1021
1022         /* XXX: shouldn't really modify cfg80211-owned data! */
1023         ifmgd->associated->channel = sdata->csa_chandef.chan;
1024
1025         ifmgd->csa_waiting_bcn = true;
1026
1027         ieee80211_sta_reset_beacon_monitor(sdata);
1028         ieee80211_sta_reset_conn_monitor(sdata);
1029
1030 out:
1031         mutex_unlock(&local->chanctx_mtx);
1032         mutex_unlock(&local->mtx);
1033         sdata_unlock(sdata);
1034 }
1035
1036 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1037 {
1038         struct ieee80211_local *local = sdata->local;
1039         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1040         int ret;
1041
1042         sdata_assert_lock(sdata);
1043
1044         WARN_ON(!sdata->vif.csa_active);
1045
1046         if (sdata->csa_block_tx) {
1047                 ieee80211_wake_vif_queues(local, sdata,
1048                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1049                 sdata->csa_block_tx = false;
1050         }
1051
1052         sdata->vif.csa_active = false;
1053         ifmgd->csa_waiting_bcn = false;
1054
1055         ret = drv_post_channel_switch(sdata);
1056         if (ret) {
1057                 sdata_info(sdata,
1058                            "driver post channel switch failed, disconnecting\n");
1059                 ieee80211_queue_work(&local->hw,
1060                                      &ifmgd->csa_connection_drop_work);
1061                 return;
1062         }
1063 }
1064
1065 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1066 {
1067         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1068         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1069
1070         trace_api_chswitch_done(sdata, success);
1071         if (!success) {
1072                 sdata_info(sdata,
1073                            "driver channel switch failed, disconnecting\n");
1074                 ieee80211_queue_work(&sdata->local->hw,
1075                                      &ifmgd->csa_connection_drop_work);
1076         } else {
1077                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1078         }
1079 }
1080 EXPORT_SYMBOL(ieee80211_chswitch_done);
1081
1082 static void ieee80211_chswitch_timer(unsigned long data)
1083 {
1084         struct ieee80211_sub_if_data *sdata =
1085                 (struct ieee80211_sub_if_data *) data;
1086
1087         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1088 }
1089
1090 static void
1091 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1092                                  u64 timestamp, u32 device_timestamp,
1093                                  struct ieee802_11_elems *elems,
1094                                  bool beacon)
1095 {
1096         struct ieee80211_local *local = sdata->local;
1097         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1098         struct cfg80211_bss *cbss = ifmgd->associated;
1099         struct ieee80211_chanctx_conf *conf;
1100         struct ieee80211_chanctx *chanctx;
1101         enum ieee80211_band current_band;
1102         struct ieee80211_csa_ie csa_ie;
1103         struct ieee80211_channel_switch ch_switch;
1104         int res;
1105
1106         sdata_assert_lock(sdata);
1107
1108         if (!cbss)
1109                 return;
1110
1111         if (local->scanning)
1112                 return;
1113
1114         /* disregard subsequent announcements if we are already processing */
1115         if (sdata->vif.csa_active)
1116                 return;
1117
1118         current_band = cbss->channel->band;
1119         memset(&csa_ie, 0, sizeof(csa_ie));
1120         res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
1121                                            ifmgd->flags,
1122                                            ifmgd->associated->bssid, &csa_ie);
1123         if (res < 0)
1124                 ieee80211_queue_work(&local->hw,
1125                                      &ifmgd->csa_connection_drop_work);
1126         if (res)
1127                 return;
1128
1129         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1130                                      IEEE80211_CHAN_DISABLED)) {
1131                 sdata_info(sdata,
1132                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1133                            ifmgd->associated->bssid,
1134                            csa_ie.chandef.chan->center_freq,
1135                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1136                            csa_ie.chandef.center_freq2);
1137                 ieee80211_queue_work(&local->hw,
1138                                      &ifmgd->csa_connection_drop_work);
1139                 return;
1140         }
1141
1142         mutex_lock(&local->mtx);
1143         mutex_lock(&local->chanctx_mtx);
1144         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1145                                          lockdep_is_held(&local->chanctx_mtx));
1146         if (!conf) {
1147                 sdata_info(sdata,
1148                            "no channel context assigned to vif?, disconnecting\n");
1149                 ieee80211_queue_work(&local->hw,
1150                                      &ifmgd->csa_connection_drop_work);
1151                 mutex_unlock(&local->chanctx_mtx);
1152                 mutex_unlock(&local->mtx);
1153                 return;
1154         }
1155
1156         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1157
1158         if (local->use_chanctx &&
1159             !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1160                 sdata_info(sdata,
1161                            "driver doesn't support chan-switch with channel contexts\n");
1162                 ieee80211_queue_work(&local->hw,
1163                                      &ifmgd->csa_connection_drop_work);
1164                 mutex_unlock(&local->chanctx_mtx);
1165                 mutex_unlock(&local->mtx);
1166                 return;
1167         }
1168
1169         ch_switch.timestamp = timestamp;
1170         ch_switch.device_timestamp = device_timestamp;
1171         ch_switch.block_tx = csa_ie.mode;
1172         ch_switch.chandef = csa_ie.chandef;
1173         ch_switch.count = csa_ie.count;
1174
1175         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1176                 sdata_info(sdata,
1177                            "preparing for channel switch failed, disconnecting\n");
1178                 ieee80211_queue_work(&local->hw,
1179                                      &ifmgd->csa_connection_drop_work);
1180                 mutex_unlock(&local->chanctx_mtx);
1181                 mutex_unlock(&local->mtx);
1182                 return;
1183         }
1184
1185         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1186                                             chanctx->mode, false);
1187         if (res) {
1188                 sdata_info(sdata,
1189                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1190                            res);
1191                 ieee80211_queue_work(&local->hw,
1192                                      &ifmgd->csa_connection_drop_work);
1193                 mutex_unlock(&local->chanctx_mtx);
1194                 mutex_unlock(&local->mtx);
1195                 return;
1196         }
1197         mutex_unlock(&local->chanctx_mtx);
1198
1199         sdata->vif.csa_active = true;
1200         sdata->csa_chandef = csa_ie.chandef;
1201         sdata->csa_block_tx = csa_ie.mode;
1202
1203         if (sdata->csa_block_tx)
1204                 ieee80211_stop_vif_queues(local, sdata,
1205                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1206         mutex_unlock(&local->mtx);
1207
1208         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1209                                           csa_ie.count);
1210
1211         if (local->ops->channel_switch) {
1212                 /* use driver's channel switch callback */
1213                 drv_channel_switch(local, sdata, &ch_switch);
1214                 return;
1215         }
1216
1217         /* channel switch handled in software */
1218         if (csa_ie.count <= 1)
1219                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1220         else
1221                 mod_timer(&ifmgd->chswitch_timer,
1222                           TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1223 }
1224
1225 static bool
1226 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1227                                  struct ieee80211_channel *channel,
1228                                  const u8 *country_ie, u8 country_ie_len,
1229                                  const u8 *pwr_constr_elem,
1230                                  int *chan_pwr, int *pwr_reduction)
1231 {
1232         struct ieee80211_country_ie_triplet *triplet;
1233         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1234         int i, chan_increment;
1235         bool have_chan_pwr = false;
1236
1237         /* Invalid IE */
1238         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1239                 return false;
1240
1241         triplet = (void *)(country_ie + 3);
1242         country_ie_len -= 3;
1243
1244         switch (channel->band) {
1245         default:
1246                 WARN_ON_ONCE(1);
1247                 /* fall through */
1248         case IEEE80211_BAND_2GHZ:
1249         case IEEE80211_BAND_60GHZ:
1250                 chan_increment = 1;
1251                 break;
1252         case IEEE80211_BAND_5GHZ:
1253                 chan_increment = 4;
1254                 break;
1255         }
1256
1257         /* find channel */
1258         while (country_ie_len >= 3) {
1259                 u8 first_channel = triplet->chans.first_channel;
1260
1261                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1262                         goto next;
1263
1264                 for (i = 0; i < triplet->chans.num_channels; i++) {
1265                         if (first_channel + i * chan_increment == chan) {
1266                                 have_chan_pwr = true;
1267                                 *chan_pwr = triplet->chans.max_power;
1268                                 break;
1269                         }
1270                 }
1271                 if (have_chan_pwr)
1272                         break;
1273
1274  next:
1275                 triplet++;
1276                 country_ie_len -= 3;
1277         }
1278
1279         if (have_chan_pwr)
1280                 *pwr_reduction = *pwr_constr_elem;
1281         return have_chan_pwr;
1282 }
1283
1284 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1285                                       struct ieee80211_channel *channel,
1286                                       const u8 *cisco_dtpc_ie,
1287                                       int *pwr_level)
1288 {
1289         /* From practical testing, the first data byte of the DTPC element
1290          * seems to contain the requested dBm level, and the CLI on Cisco
1291          * APs clearly state the range is -127 to 127 dBm, which indicates
1292          * a signed byte, although it seemingly never actually goes negative.
1293          * The other byte seems to always be zero.
1294          */
1295         *pwr_level = (__s8)cisco_dtpc_ie[4];
1296 }
1297
1298 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1299                                        struct ieee80211_channel *channel,
1300                                        struct ieee80211_mgmt *mgmt,
1301                                        const u8 *country_ie, u8 country_ie_len,
1302                                        const u8 *pwr_constr_ie,
1303                                        const u8 *cisco_dtpc_ie)
1304 {
1305         bool has_80211h_pwr = false, has_cisco_pwr = false;
1306         int chan_pwr = 0, pwr_reduction_80211h = 0;
1307         int pwr_level_cisco, pwr_level_80211h;
1308         int new_ap_level;
1309
1310         if (country_ie && pwr_constr_ie &&
1311             mgmt->u.probe_resp.capab_info &
1312                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT)) {
1313                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1314                         sdata, channel, country_ie, country_ie_len,
1315                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1316                 pwr_level_80211h =
1317                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1318         }
1319
1320         if (cisco_dtpc_ie) {
1321                 ieee80211_find_cisco_dtpc(
1322                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1323                 has_cisco_pwr = true;
1324         }
1325
1326         if (!has_80211h_pwr && !has_cisco_pwr)
1327                 return 0;
1328
1329         /* If we have both 802.11h and Cisco DTPC, apply both limits
1330          * by picking the smallest of the two power levels advertised.
1331          */
1332         if (has_80211h_pwr &&
1333             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1334                 sdata_info(sdata,
1335                            "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1336                            pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1337                            sdata->u.mgd.bssid);
1338                 new_ap_level = pwr_level_80211h;
1339         } else {  /* has_cisco_pwr is always true here. */
1340                 sdata_info(sdata,
1341                            "Limiting TX power to %d dBm as advertised by %pM\n",
1342                            pwr_level_cisco, sdata->u.mgd.bssid);
1343                 new_ap_level = pwr_level_cisco;
1344         }
1345
1346         if (sdata->ap_power_level == new_ap_level)
1347                 return 0;
1348
1349         sdata->ap_power_level = new_ap_level;
1350         if (__ieee80211_recalc_txpower(sdata))
1351                 return BSS_CHANGED_TXPOWER;
1352         return 0;
1353 }
1354
1355 /* powersave */
1356 static void ieee80211_enable_ps(struct ieee80211_local *local,
1357                                 struct ieee80211_sub_if_data *sdata)
1358 {
1359         struct ieee80211_conf *conf = &local->hw.conf;
1360
1361         /*
1362          * If we are scanning right now then the parameters will
1363          * take effect when scan finishes.
1364          */
1365         if (local->scanning)
1366                 return;
1367
1368         if (conf->dynamic_ps_timeout > 0 &&
1369             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1370                 mod_timer(&local->dynamic_ps_timer, jiffies +
1371                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1372         } else {
1373                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1374                         ieee80211_send_nullfunc(local, sdata, 1);
1375
1376                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1377                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1378                         return;
1379
1380                 conf->flags |= IEEE80211_CONF_PS;
1381                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1382         }
1383 }
1384
1385 static void ieee80211_change_ps(struct ieee80211_local *local)
1386 {
1387         struct ieee80211_conf *conf = &local->hw.conf;
1388
1389         if (local->ps_sdata) {
1390                 ieee80211_enable_ps(local, local->ps_sdata);
1391         } else if (conf->flags & IEEE80211_CONF_PS) {
1392                 conf->flags &= ~IEEE80211_CONF_PS;
1393                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1394                 del_timer_sync(&local->dynamic_ps_timer);
1395                 cancel_work_sync(&local->dynamic_ps_enable_work);
1396         }
1397 }
1398
1399 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1400 {
1401         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1402         struct sta_info *sta = NULL;
1403         bool authorized = false;
1404
1405         if (!mgd->powersave)
1406                 return false;
1407
1408         if (mgd->broken_ap)
1409                 return false;
1410
1411         if (!mgd->associated)
1412                 return false;
1413
1414         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1415                 return false;
1416
1417         if (!mgd->have_beacon)
1418                 return false;
1419
1420         rcu_read_lock();
1421         sta = sta_info_get(sdata, mgd->bssid);
1422         if (sta)
1423                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1424         rcu_read_unlock();
1425
1426         return authorized;
1427 }
1428
1429 /* need to hold RTNL or interface lock */
1430 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1431 {
1432         struct ieee80211_sub_if_data *sdata, *found = NULL;
1433         int count = 0;
1434         int timeout;
1435
1436         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1437                 local->ps_sdata = NULL;
1438                 return;
1439         }
1440
1441         list_for_each_entry(sdata, &local->interfaces, list) {
1442                 if (!ieee80211_sdata_running(sdata))
1443                         continue;
1444                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1445                         /* If an AP vif is found, then disable PS
1446                          * by setting the count to zero thereby setting
1447                          * ps_sdata to NULL.
1448                          */
1449                         count = 0;
1450                         break;
1451                 }
1452                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1453                         continue;
1454                 found = sdata;
1455                 count++;
1456         }
1457
1458         if (count == 1 && ieee80211_powersave_allowed(found)) {
1459                 s32 beaconint_us;
1460
1461                 if (latency < 0)
1462                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1463
1464                 beaconint_us = ieee80211_tu_to_usec(
1465                                         found->vif.bss_conf.beacon_int);
1466
1467                 timeout = local->dynamic_ps_forced_timeout;
1468                 if (timeout < 0) {
1469                         /*
1470                          * Go to full PSM if the user configures a very low
1471                          * latency requirement.
1472                          * The 2000 second value is there for compatibility
1473                          * until the PM_QOS_NETWORK_LATENCY is configured
1474                          * with real values.
1475                          */
1476                         if (latency > (1900 * USEC_PER_MSEC) &&
1477                             latency != (2000 * USEC_PER_SEC))
1478                                 timeout = 0;
1479                         else
1480                                 timeout = 100;
1481                 }
1482                 local->hw.conf.dynamic_ps_timeout = timeout;
1483
1484                 if (beaconint_us > latency) {
1485                         local->ps_sdata = NULL;
1486                 } else {
1487                         int maxslp = 1;
1488                         u8 dtimper = found->u.mgd.dtim_period;
1489
1490                         /* If the TIM IE is invalid, pretend the value is 1 */
1491                         if (!dtimper)
1492                                 dtimper = 1;
1493                         else if (dtimper > 1)
1494                                 maxslp = min_t(int, dtimper,
1495                                                     latency / beaconint_us);
1496
1497                         local->hw.conf.max_sleep_period = maxslp;
1498                         local->hw.conf.ps_dtim_period = dtimper;
1499                         local->ps_sdata = found;
1500                 }
1501         } else {
1502                 local->ps_sdata = NULL;
1503         }
1504
1505         ieee80211_change_ps(local);
1506 }
1507
1508 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1509 {
1510         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1511
1512         if (sdata->vif.bss_conf.ps != ps_allowed) {
1513                 sdata->vif.bss_conf.ps = ps_allowed;
1514                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1515         }
1516 }
1517
1518 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1519 {
1520         struct ieee80211_local *local =
1521                 container_of(work, struct ieee80211_local,
1522                              dynamic_ps_disable_work);
1523
1524         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1525                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1526                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1527         }
1528
1529         ieee80211_wake_queues_by_reason(&local->hw,
1530                                         IEEE80211_MAX_QUEUE_MAP,
1531                                         IEEE80211_QUEUE_STOP_REASON_PS,
1532                                         false);
1533 }
1534
1535 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1536 {
1537         struct ieee80211_local *local =
1538                 container_of(work, struct ieee80211_local,
1539                              dynamic_ps_enable_work);
1540         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1541         struct ieee80211_if_managed *ifmgd;
1542         unsigned long flags;
1543         int q;
1544
1545         /* can only happen when PS was just disabled anyway */
1546         if (!sdata)
1547                 return;
1548
1549         ifmgd = &sdata->u.mgd;
1550
1551         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1552                 return;
1553
1554         if (local->hw.conf.dynamic_ps_timeout > 0) {
1555                 /* don't enter PS if TX frames are pending */
1556                 if (drv_tx_frames_pending(local)) {
1557                         mod_timer(&local->dynamic_ps_timer, jiffies +
1558                                   msecs_to_jiffies(
1559                                   local->hw.conf.dynamic_ps_timeout));
1560                         return;
1561                 }
1562
1563                 /*
1564                  * transmission can be stopped by others which leads to
1565                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1566                  * is not the actual idle state.
1567                  */
1568                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1569                 for (q = 0; q < local->hw.queues; q++) {
1570                         if (local->queue_stop_reasons[q]) {
1571                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1572                                                        flags);
1573                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1574                                           msecs_to_jiffies(
1575                                           local->hw.conf.dynamic_ps_timeout));
1576                                 return;
1577                         }
1578                 }
1579                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1580         }
1581
1582         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1583             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1584                 if (drv_tx_frames_pending(local)) {
1585                         mod_timer(&local->dynamic_ps_timer, jiffies +
1586                                   msecs_to_jiffies(
1587                                   local->hw.conf.dynamic_ps_timeout));
1588                 } else {
1589                         ieee80211_send_nullfunc(local, sdata, 1);
1590                         /* Flush to get the tx status of nullfunc frame */
1591                         ieee80211_flush_queues(local, sdata);
1592                 }
1593         }
1594
1595         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1596               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1597             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1598                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1599                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1600                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1601         }
1602 }
1603
1604 void ieee80211_dynamic_ps_timer(unsigned long data)
1605 {
1606         struct ieee80211_local *local = (void *) data;
1607
1608         if (local->quiescing || local->suspended)
1609                 return;
1610
1611         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1612 }
1613
1614 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1615 {
1616         struct delayed_work *delayed_work =
1617                 container_of(work, struct delayed_work, work);
1618         struct ieee80211_sub_if_data *sdata =
1619                 container_of(delayed_work, struct ieee80211_sub_if_data,
1620                              dfs_cac_timer_work);
1621         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1622
1623         mutex_lock(&sdata->local->mtx);
1624         if (sdata->wdev.cac_started) {
1625                 ieee80211_vif_release_channel(sdata);
1626                 cfg80211_cac_event(sdata->dev, &chandef,
1627                                    NL80211_RADAR_CAC_FINISHED,
1628                                    GFP_KERNEL);
1629         }
1630         mutex_unlock(&sdata->local->mtx);
1631 }
1632
1633 static bool
1634 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1635 {
1636         struct ieee80211_local *local = sdata->local;
1637         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1638         bool ret;
1639         int ac;
1640
1641         if (local->hw.queues < IEEE80211_NUM_ACS)
1642                 return false;
1643
1644         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1645                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1646                 int non_acm_ac;
1647                 unsigned long now = jiffies;
1648
1649                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1650                     tx_tspec->admitted_time &&
1651                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1652                         tx_tspec->consumed_tx_time = 0;
1653                         tx_tspec->time_slice_start = now;
1654
1655                         if (tx_tspec->downgraded)
1656                                 tx_tspec->action =
1657                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1658                 }
1659
1660                 switch (tx_tspec->action) {
1661                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1662                         /* take the original parameters */
1663                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1664                                 sdata_err(sdata,
1665                                           "failed to set TX queue parameters for queue %d\n",
1666                                           ac);
1667                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1668                         tx_tspec->downgraded = false;
1669                         ret = true;
1670                         break;
1671                 case TX_TSPEC_ACTION_DOWNGRADE:
1672                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1673                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1674                                 ret = true;
1675                                 break;
1676                         }
1677                         /* downgrade next lower non-ACM AC */
1678                         for (non_acm_ac = ac + 1;
1679                              non_acm_ac < IEEE80211_NUM_ACS;
1680                              non_acm_ac++)
1681                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1682                                         break;
1683                         /* The loop will result in using BK even if it requires
1684                          * admission control, such configuration makes no sense
1685                          * and we have to transmit somehow - the AC selection
1686                          * does the same thing.
1687                          */
1688                         if (drv_conf_tx(local, sdata, ac,
1689                                         &sdata->tx_conf[non_acm_ac]))
1690                                 sdata_err(sdata,
1691                                           "failed to set TX queue parameters for queue %d\n",
1692                                           ac);
1693                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1694                         ret = true;
1695                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1696                                 tx_tspec->time_slice_start + HZ - now + 1);
1697                         break;
1698                 case TX_TSPEC_ACTION_NONE:
1699                         /* nothing now */
1700                         break;
1701                 }
1702         }
1703
1704         return ret;
1705 }
1706
1707 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1708 {
1709         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1710                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1711 }
1712
1713 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1714 {
1715         struct ieee80211_sub_if_data *sdata;
1716
1717         sdata = container_of(work, struct ieee80211_sub_if_data,
1718                              u.mgd.tx_tspec_wk.work);
1719         ieee80211_sta_handle_tspec_ac_params(sdata);
1720 }
1721
1722 /* MLME */
1723 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1724                                      struct ieee80211_sub_if_data *sdata,
1725                                      const u8 *wmm_param, size_t wmm_param_len)
1726 {
1727         struct ieee80211_tx_queue_params params;
1728         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1729         size_t left;
1730         int count;
1731         const u8 *pos;
1732         u8 uapsd_queues = 0;
1733
1734         if (!local->ops->conf_tx)
1735                 return false;
1736
1737         if (local->hw.queues < IEEE80211_NUM_ACS)
1738                 return false;
1739
1740         if (!wmm_param)
1741                 return false;
1742
1743         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1744                 return false;
1745
1746         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1747                 uapsd_queues = ifmgd->uapsd_queues;
1748
1749         count = wmm_param[6] & 0x0f;
1750         if (count == ifmgd->wmm_last_param_set)
1751                 return false;
1752         ifmgd->wmm_last_param_set = count;
1753
1754         pos = wmm_param + 8;
1755         left = wmm_param_len - 8;
1756
1757         memset(&params, 0, sizeof(params));
1758
1759         sdata->wmm_acm = 0;
1760         for (; left >= 4; left -= 4, pos += 4) {
1761                 int aci = (pos[0] >> 5) & 0x03;
1762                 int acm = (pos[0] >> 4) & 0x01;
1763                 bool uapsd = false;
1764                 int queue;
1765
1766                 switch (aci) {
1767                 case 1: /* AC_BK */
1768                         queue = 3;
1769                         if (acm)
1770                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1771                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1772                                 uapsd = true;
1773                         break;
1774                 case 2: /* AC_VI */
1775                         queue = 1;
1776                         if (acm)
1777                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1778                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1779                                 uapsd = true;
1780                         break;
1781                 case 3: /* AC_VO */
1782                         queue = 0;
1783                         if (acm)
1784                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1785                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1786                                 uapsd = true;
1787                         break;
1788                 case 0: /* AC_BE */
1789                 default:
1790                         queue = 2;
1791                         if (acm)
1792                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1793                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1794                                 uapsd = true;
1795                         break;
1796                 }
1797
1798                 params.aifs = pos[0] & 0x0f;
1799                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1800                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1801                 params.txop = get_unaligned_le16(pos + 2);
1802                 params.acm = acm;
1803                 params.uapsd = uapsd;
1804
1805                 mlme_dbg(sdata,
1806                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1807                          queue, aci, acm,
1808                          params.aifs, params.cw_min, params.cw_max,
1809                          params.txop, params.uapsd,
1810                          ifmgd->tx_tspec[queue].downgraded);
1811                 sdata->tx_conf[queue] = params;
1812                 if (!ifmgd->tx_tspec[queue].downgraded &&
1813                     drv_conf_tx(local, sdata, queue, &params))
1814                         sdata_err(sdata,
1815                                   "failed to set TX queue parameters for queue %d\n",
1816                                   queue);
1817         }
1818
1819         /* enable WMM or activate new settings */
1820         sdata->vif.bss_conf.qos = true;
1821         return true;
1822 }
1823
1824 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1825 {
1826         lockdep_assert_held(&sdata->local->mtx);
1827
1828         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1829         ieee80211_run_deferred_scan(sdata->local);
1830 }
1831
1832 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1833 {
1834         mutex_lock(&sdata->local->mtx);
1835         __ieee80211_stop_poll(sdata);
1836         mutex_unlock(&sdata->local->mtx);
1837 }
1838
1839 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1840                                            u16 capab, bool erp_valid, u8 erp)
1841 {
1842         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1843         u32 changed = 0;
1844         bool use_protection;
1845         bool use_short_preamble;
1846         bool use_short_slot;
1847
1848         if (erp_valid) {
1849                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1850                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1851         } else {
1852                 use_protection = false;
1853                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1854         }
1855
1856         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1857         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1858                 use_short_slot = true;
1859
1860         if (use_protection != bss_conf->use_cts_prot) {
1861                 bss_conf->use_cts_prot = use_protection;
1862                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1863         }
1864
1865         if (use_short_preamble != bss_conf->use_short_preamble) {
1866                 bss_conf->use_short_preamble = use_short_preamble;
1867                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1868         }
1869
1870         if (use_short_slot != bss_conf->use_short_slot) {
1871                 bss_conf->use_short_slot = use_short_slot;
1872                 changed |= BSS_CHANGED_ERP_SLOT;
1873         }
1874
1875         return changed;
1876 }
1877
1878 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1879                                      struct cfg80211_bss *cbss,
1880                                      u32 bss_info_changed)
1881 {
1882         struct ieee80211_bss *bss = (void *)cbss->priv;
1883         struct ieee80211_local *local = sdata->local;
1884         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1885
1886         bss_info_changed |= BSS_CHANGED_ASSOC;
1887         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1888                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1889
1890         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1891                 beacon_loss_count * bss_conf->beacon_int));
1892
1893         sdata->u.mgd.associated = cbss;
1894         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1895
1896         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1897
1898         if (sdata->vif.p2p) {
1899                 const struct cfg80211_bss_ies *ies;
1900
1901                 rcu_read_lock();
1902                 ies = rcu_dereference(cbss->ies);
1903                 if (ies) {
1904                         int ret;
1905
1906                         ret = cfg80211_get_p2p_attr(
1907                                         ies->data, ies->len,
1908                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1909                                         (u8 *) &bss_conf->p2p_noa_attr,
1910                                         sizeof(bss_conf->p2p_noa_attr));
1911                         if (ret >= 2) {
1912                                 sdata->u.mgd.p2p_noa_index =
1913                                         bss_conf->p2p_noa_attr.index;
1914                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1915                         }
1916                 }
1917                 rcu_read_unlock();
1918         }
1919
1920         /* just to be sure */
1921         ieee80211_stop_poll(sdata);
1922
1923         ieee80211_led_assoc(local, 1);
1924
1925         if (sdata->u.mgd.have_beacon) {
1926                 /*
1927                  * If the AP is buggy we may get here with no DTIM period
1928                  * known, so assume it's 1 which is the only safe assumption
1929                  * in that case, although if the TIM IE is broken powersave
1930                  * probably just won't work at all.
1931                  */
1932                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1933                 bss_conf->beacon_rate = bss->beacon_rate;
1934                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1935         } else {
1936                 bss_conf->beacon_rate = NULL;
1937                 bss_conf->dtim_period = 0;
1938         }
1939
1940         bss_conf->assoc = 1;
1941
1942         /* Tell the driver to monitor connection quality (if supported) */
1943         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1944             bss_conf->cqm_rssi_thold)
1945                 bss_info_changed |= BSS_CHANGED_CQM;
1946
1947         /* Enable ARP filtering */
1948         if (bss_conf->arp_addr_cnt)
1949                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1950
1951         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1952
1953         mutex_lock(&local->iflist_mtx);
1954         ieee80211_recalc_ps(local, -1);
1955         mutex_unlock(&local->iflist_mtx);
1956
1957         ieee80211_recalc_smps(sdata);
1958         ieee80211_recalc_ps_vif(sdata);
1959
1960         netif_carrier_on(sdata->dev);
1961 }
1962
1963 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1964                                    u16 stype, u16 reason, bool tx,
1965                                    u8 *frame_buf)
1966 {
1967         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1968         struct ieee80211_local *local = sdata->local;
1969         u32 changed = 0;
1970
1971         sdata_assert_lock(sdata);
1972
1973         if (WARN_ON_ONCE(tx && !frame_buf))
1974                 return;
1975
1976         if (WARN_ON(!ifmgd->associated))
1977                 return;
1978
1979         ieee80211_stop_poll(sdata);
1980
1981         ifmgd->associated = NULL;
1982         netif_carrier_off(sdata->dev);
1983
1984         /*
1985          * if we want to get out of ps before disassoc (why?) we have
1986          * to do it before sending disassoc, as otherwise the null-packet
1987          * won't be valid.
1988          */
1989         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1990                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1991                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1992         }
1993         local->ps_sdata = NULL;
1994
1995         /* disable per-vif ps */
1996         ieee80211_recalc_ps_vif(sdata);
1997
1998         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1999         if (tx)
2000                 ieee80211_flush_queues(local, sdata);
2001
2002         /* deauthenticate/disassociate now */
2003         if (tx || frame_buf)
2004                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2005                                                reason, tx, frame_buf);
2006
2007         /* flush out frame */
2008         if (tx)
2009                 ieee80211_flush_queues(local, sdata);
2010
2011         /* clear bssid only after building the needed mgmt frames */
2012         memset(ifmgd->bssid, 0, ETH_ALEN);
2013
2014         /* remove AP and TDLS peers */
2015         sta_info_flush(sdata);
2016
2017         /* finally reset all BSS / config parameters */
2018         changed |= ieee80211_reset_erp_info(sdata);
2019
2020         ieee80211_led_assoc(local, 0);
2021         changed |= BSS_CHANGED_ASSOC;
2022         sdata->vif.bss_conf.assoc = false;
2023
2024         ifmgd->p2p_noa_index = -1;
2025         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2026                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2027
2028         /* on the next assoc, re-program HT/VHT parameters */
2029         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2030         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2031         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2032         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2033
2034         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2035
2036         del_timer_sync(&local->dynamic_ps_timer);
2037         cancel_work_sync(&local->dynamic_ps_enable_work);
2038
2039         /* Disable ARP filtering */
2040         if (sdata->vif.bss_conf.arp_addr_cnt)
2041                 changed |= BSS_CHANGED_ARP_FILTER;
2042
2043         sdata->vif.bss_conf.qos = false;
2044         changed |= BSS_CHANGED_QOS;
2045
2046         /* The BSSID (not really interesting) and HT changed */
2047         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2048         ieee80211_bss_info_change_notify(sdata, changed);
2049
2050         /* disassociated - set to defaults now */
2051         ieee80211_set_wmm_default(sdata, false);
2052
2053         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2054         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2055         del_timer_sync(&sdata->u.mgd.timer);
2056         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2057
2058         sdata->vif.bss_conf.dtim_period = 0;
2059         sdata->vif.bss_conf.beacon_rate = NULL;
2060
2061         ifmgd->have_beacon = false;
2062
2063         ifmgd->flags = 0;
2064         mutex_lock(&local->mtx);
2065         ieee80211_vif_release_channel(sdata);
2066
2067         sdata->vif.csa_active = false;
2068         ifmgd->csa_waiting_bcn = false;
2069         if (sdata->csa_block_tx) {
2070                 ieee80211_wake_vif_queues(local, sdata,
2071                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2072                 sdata->csa_block_tx = false;
2073         }
2074         mutex_unlock(&local->mtx);
2075
2076         /* existing TX TSPEC sessions no longer exist */
2077         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2078         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2079
2080         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2081 }
2082
2083 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2084                              struct ieee80211_hdr *hdr)
2085 {
2086         /*
2087          * We can postpone the mgd.timer whenever receiving unicast frames
2088          * from AP because we know that the connection is working both ways
2089          * at that time. But multicast frames (and hence also beacons) must
2090          * be ignored here, because we need to trigger the timer during
2091          * data idle periods for sending the periodic probe request to the
2092          * AP we're connected to.
2093          */
2094         if (is_multicast_ether_addr(hdr->addr1))
2095                 return;
2096
2097         ieee80211_sta_reset_conn_monitor(sdata);
2098 }
2099
2100 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2101 {
2102         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2103         struct ieee80211_local *local = sdata->local;
2104
2105         mutex_lock(&local->mtx);
2106         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2107                 goto out;
2108
2109         __ieee80211_stop_poll(sdata);
2110
2111         mutex_lock(&local->iflist_mtx);
2112         ieee80211_recalc_ps(local, -1);
2113         mutex_unlock(&local->iflist_mtx);
2114
2115         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2116                 goto out;
2117
2118         /*
2119          * We've received a probe response, but are not sure whether
2120          * we have or will be receiving any beacons or data, so let's
2121          * schedule the timers again, just in case.
2122          */
2123         ieee80211_sta_reset_beacon_monitor(sdata);
2124
2125         mod_timer(&ifmgd->conn_mon_timer,
2126                   round_jiffies_up(jiffies +
2127                                    IEEE80211_CONNECTION_IDLE_TIME));
2128 out:
2129         mutex_unlock(&local->mtx);
2130 }
2131
2132 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2133                                            struct ieee80211_hdr *hdr,
2134                                            u16 tx_time)
2135 {
2136         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2137         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2138         int ac = ieee80211_ac_from_tid(tid);
2139         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2140         unsigned long now = jiffies;
2141
2142         if (likely(!tx_tspec->admitted_time))
2143                 return;
2144
2145         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2146                 tx_tspec->consumed_tx_time = 0;
2147                 tx_tspec->time_slice_start = now;
2148
2149                 if (tx_tspec->downgraded) {
2150                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2151                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2152                 }
2153         }
2154
2155         if (tx_tspec->downgraded)
2156                 return;
2157
2158         tx_tspec->consumed_tx_time += tx_time;
2159
2160         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2161                 tx_tspec->downgraded = true;
2162                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2163                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2164         }
2165 }
2166
2167 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2168                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2169 {
2170         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2171
2172         if (!ieee80211_is_data(hdr->frame_control))
2173             return;
2174
2175         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2176             sdata->u.mgd.probe_send_count > 0) {
2177                 if (ack)
2178                         ieee80211_sta_reset_conn_monitor(sdata);
2179                 else
2180                         sdata->u.mgd.nullfunc_failed = true;
2181                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2182                 return;
2183         }
2184
2185         if (ack)
2186                 ieee80211_sta_reset_conn_monitor(sdata);
2187 }
2188
2189 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2190 {
2191         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2192         const u8 *ssid;
2193         u8 *dst = ifmgd->associated->bssid;
2194         u8 unicast_limit = max(1, max_probe_tries - 3);
2195
2196         /*
2197          * Try sending broadcast probe requests for the last three
2198          * probe requests after the first ones failed since some
2199          * buggy APs only support broadcast probe requests.
2200          */
2201         if (ifmgd->probe_send_count >= unicast_limit)
2202                 dst = NULL;
2203
2204         /*
2205          * When the hardware reports an accurate Tx ACK status, it's
2206          * better to send a nullfunc frame instead of a probe request,
2207          * as it will kick us off the AP quickly if we aren't associated
2208          * anymore. The timeout will be reset if the frame is ACKed by
2209          * the AP.
2210          */
2211         ifmgd->probe_send_count++;
2212
2213         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2214                 ifmgd->nullfunc_failed = false;
2215                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2216         } else {
2217                 int ssid_len;
2218
2219                 rcu_read_lock();
2220                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2221                 if (WARN_ON_ONCE(ssid == NULL))
2222                         ssid_len = 0;
2223                 else
2224                         ssid_len = ssid[1];
2225
2226                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
2227                                          0, (u32) -1, true, 0,
2228                                          ifmgd->associated->channel, false);
2229                 rcu_read_unlock();
2230         }
2231
2232         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2233         run_again(sdata, ifmgd->probe_timeout);
2234 }
2235
2236 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2237                                    bool beacon)
2238 {
2239         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2240         bool already = false;
2241
2242         if (!ieee80211_sdata_running(sdata))
2243                 return;
2244
2245         sdata_lock(sdata);
2246
2247         if (!ifmgd->associated)
2248                 goto out;
2249
2250         mutex_lock(&sdata->local->mtx);
2251
2252         if (sdata->local->tmp_channel || sdata->local->scanning) {
2253                 mutex_unlock(&sdata->local->mtx);
2254                 goto out;
2255         }
2256
2257         if (beacon) {
2258                 mlme_dbg_ratelimited(sdata,
2259                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2260                                      beacon_loss_count);
2261
2262                 ieee80211_cqm_rssi_notify(&sdata->vif,
2263                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
2264                                           GFP_KERNEL);
2265         }
2266
2267         /*
2268          * The driver/our work has already reported this event or the
2269          * connection monitoring has kicked in and we have already sent
2270          * a probe request. Or maybe the AP died and the driver keeps
2271          * reporting until we disassociate...
2272          *
2273          * In either case we have to ignore the current call to this
2274          * function (except for setting the correct probe reason bit)
2275          * because otherwise we would reset the timer every time and
2276          * never check whether we received a probe response!
2277          */
2278         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2279                 already = true;
2280
2281         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2282
2283         mutex_unlock(&sdata->local->mtx);
2284
2285         if (already)
2286                 goto out;
2287
2288         mutex_lock(&sdata->local->iflist_mtx);
2289         ieee80211_recalc_ps(sdata->local, -1);
2290         mutex_unlock(&sdata->local->iflist_mtx);
2291
2292         ifmgd->probe_send_count = 0;
2293         ieee80211_mgd_probe_ap_send(sdata);
2294  out:
2295         sdata_unlock(sdata);
2296 }
2297
2298 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2299                                           struct ieee80211_vif *vif)
2300 {
2301         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2302         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2303         struct cfg80211_bss *cbss;
2304         struct sk_buff *skb;
2305         const u8 *ssid;
2306         int ssid_len;
2307
2308         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2309                 return NULL;
2310
2311         sdata_assert_lock(sdata);
2312
2313         if (ifmgd->associated)
2314                 cbss = ifmgd->associated;
2315         else if (ifmgd->auth_data)
2316                 cbss = ifmgd->auth_data->bss;
2317         else if (ifmgd->assoc_data)
2318                 cbss = ifmgd->assoc_data->bss;
2319         else
2320                 return NULL;
2321
2322         rcu_read_lock();
2323         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2324         if (WARN_ON_ONCE(ssid == NULL))
2325                 ssid_len = 0;
2326         else
2327                 ssid_len = ssid[1];
2328
2329         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2330                                         (u32) -1, cbss->channel,
2331                                         ssid + 2, ssid_len,
2332                                         NULL, 0, true);
2333         rcu_read_unlock();
2334
2335         return skb;
2336 }
2337 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2338
2339 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2340 {
2341         struct ieee80211_local *local = sdata->local;
2342         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2343         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2344
2345         sdata_lock(sdata);
2346         if (!ifmgd->associated) {
2347                 sdata_unlock(sdata);
2348                 return;
2349         }
2350
2351         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2352                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2353                                true, frame_buf);
2354         mutex_lock(&local->mtx);
2355         sdata->vif.csa_active = false;
2356         ifmgd->csa_waiting_bcn = false;
2357         if (sdata->csa_block_tx) {
2358                 ieee80211_wake_vif_queues(local, sdata,
2359                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2360                 sdata->csa_block_tx = false;
2361         }
2362         mutex_unlock(&local->mtx);
2363
2364         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2365                               IEEE80211_DEAUTH_FRAME_LEN);
2366         sdata_unlock(sdata);
2367 }
2368
2369 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2370 {
2371         struct ieee80211_sub_if_data *sdata =
2372                 container_of(work, struct ieee80211_sub_if_data,
2373                              u.mgd.beacon_connection_loss_work);
2374         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2375         struct sta_info *sta;
2376
2377         if (ifmgd->associated) {
2378                 rcu_read_lock();
2379                 sta = sta_info_get(sdata, ifmgd->bssid);
2380                 if (sta)
2381                         sta->beacon_loss_count++;
2382                 rcu_read_unlock();
2383         }
2384
2385         if (ifmgd->connection_loss) {
2386                 sdata_info(sdata, "Connection to AP %pM lost\n",
2387                            ifmgd->bssid);
2388                 __ieee80211_disconnect(sdata);
2389         } else {
2390                 ieee80211_mgd_probe_ap(sdata, true);
2391         }
2392 }
2393
2394 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2395 {
2396         struct ieee80211_sub_if_data *sdata =
2397                 container_of(work, struct ieee80211_sub_if_data,
2398                              u.mgd.csa_connection_drop_work);
2399
2400         __ieee80211_disconnect(sdata);
2401 }
2402
2403 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2404 {
2405         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2406         struct ieee80211_hw *hw = &sdata->local->hw;
2407
2408         trace_api_beacon_loss(sdata);
2409
2410         sdata->u.mgd.connection_loss = false;
2411         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2412 }
2413 EXPORT_SYMBOL(ieee80211_beacon_loss);
2414
2415 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2416 {
2417         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2418         struct ieee80211_hw *hw = &sdata->local->hw;
2419
2420         trace_api_connection_loss(sdata);
2421
2422         sdata->u.mgd.connection_loss = true;
2423         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2424 }
2425 EXPORT_SYMBOL(ieee80211_connection_loss);
2426
2427
2428 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2429                                         bool assoc)
2430 {
2431         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2432
2433         sdata_assert_lock(sdata);
2434
2435         if (!assoc) {
2436                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2437
2438                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2439                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2440                 sdata->u.mgd.flags = 0;
2441                 mutex_lock(&sdata->local->mtx);
2442                 ieee80211_vif_release_channel(sdata);
2443                 mutex_unlock(&sdata->local->mtx);
2444         }
2445
2446         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2447         kfree(auth_data);
2448         sdata->u.mgd.auth_data = NULL;
2449 }
2450
2451 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2452                                      struct ieee80211_mgmt *mgmt, size_t len)
2453 {
2454         struct ieee80211_local *local = sdata->local;
2455         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2456         u8 *pos;
2457         struct ieee802_11_elems elems;
2458         u32 tx_flags = 0;
2459
2460         pos = mgmt->u.auth.variable;
2461         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2462         if (!elems.challenge)
2463                 return;
2464         auth_data->expected_transaction = 4;
2465         drv_mgd_prepare_tx(sdata->local, sdata);
2466         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2467                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2468                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2469         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2470                             elems.challenge - 2, elems.challenge_len + 2,
2471                             auth_data->bss->bssid, auth_data->bss->bssid,
2472                             auth_data->key, auth_data->key_len,
2473                             auth_data->key_idx, tx_flags);
2474 }
2475
2476 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2477                                    struct ieee80211_mgmt *mgmt, size_t len)
2478 {
2479         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2480         u8 bssid[ETH_ALEN];
2481         u16 auth_alg, auth_transaction, status_code;
2482         struct sta_info *sta;
2483
2484         sdata_assert_lock(sdata);
2485
2486         if (len < 24 + 6)
2487                 return;
2488
2489         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2490                 return;
2491
2492         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2493
2494         if (!ether_addr_equal(bssid, mgmt->bssid))
2495                 return;
2496
2497         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2498         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2499         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2500
2501         if (auth_alg != ifmgd->auth_data->algorithm ||
2502             auth_transaction != ifmgd->auth_data->expected_transaction) {
2503                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2504                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2505                            auth_transaction,
2506                            ifmgd->auth_data->expected_transaction);
2507                 return;
2508         }
2509
2510         if (status_code != WLAN_STATUS_SUCCESS) {
2511                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2512                            mgmt->sa, status_code);
2513                 ieee80211_destroy_auth_data(sdata, false);
2514                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2515                 return;
2516         }
2517
2518         switch (ifmgd->auth_data->algorithm) {
2519         case WLAN_AUTH_OPEN:
2520         case WLAN_AUTH_LEAP:
2521         case WLAN_AUTH_FT:
2522         case WLAN_AUTH_SAE:
2523                 break;
2524         case WLAN_AUTH_SHARED_KEY:
2525                 if (ifmgd->auth_data->expected_transaction != 4) {
2526                         ieee80211_auth_challenge(sdata, mgmt, len);
2527                         /* need another frame */
2528                         return;
2529                 }
2530                 break;
2531         default:
2532                 WARN_ONCE(1, "invalid auth alg %d",
2533                           ifmgd->auth_data->algorithm);
2534                 return;
2535         }
2536
2537         sdata_info(sdata, "authenticated\n");
2538         ifmgd->auth_data->done = true;
2539         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2540         ifmgd->auth_data->timeout_started = true;
2541         run_again(sdata, ifmgd->auth_data->timeout);
2542
2543         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2544             ifmgd->auth_data->expected_transaction != 2) {
2545                 /*
2546                  * Report auth frame to user space for processing since another
2547                  * round of Authentication frames is still needed.
2548                  */
2549                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2550                 return;
2551         }
2552
2553         /* move station state to auth */
2554         mutex_lock(&sdata->local->sta_mtx);
2555         sta = sta_info_get(sdata, bssid);
2556         if (!sta) {
2557                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2558                 goto out_err;
2559         }
2560         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2561                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2562                 goto out_err;
2563         }
2564         mutex_unlock(&sdata->local->sta_mtx);
2565
2566         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2567         return;
2568  out_err:
2569         mutex_unlock(&sdata->local->sta_mtx);
2570         /* ignore frame -- wait for timeout */
2571 }
2572
2573 #define case_WLAN(type) \
2574         case WLAN_REASON_##type: return #type
2575
2576 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2577 {
2578         switch (reason_code) {
2579         case_WLAN(UNSPECIFIED);
2580         case_WLAN(PREV_AUTH_NOT_VALID);
2581         case_WLAN(DEAUTH_LEAVING);
2582         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2583         case_WLAN(DISASSOC_AP_BUSY);
2584         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2585         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2586         case_WLAN(DISASSOC_STA_HAS_LEFT);
2587         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2588         case_WLAN(DISASSOC_BAD_POWER);
2589         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2590         case_WLAN(INVALID_IE);
2591         case_WLAN(MIC_FAILURE);
2592         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2593         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2594         case_WLAN(IE_DIFFERENT);
2595         case_WLAN(INVALID_GROUP_CIPHER);
2596         case_WLAN(INVALID_PAIRWISE_CIPHER);
2597         case_WLAN(INVALID_AKMP);
2598         case_WLAN(UNSUPP_RSN_VERSION);
2599         case_WLAN(INVALID_RSN_IE_CAP);
2600         case_WLAN(IEEE8021X_FAILED);
2601         case_WLAN(CIPHER_SUITE_REJECTED);
2602         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2603         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2604         case_WLAN(DISASSOC_LOW_ACK);
2605         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2606         case_WLAN(QSTA_LEAVE_QBSS);
2607         case_WLAN(QSTA_NOT_USE);
2608         case_WLAN(QSTA_REQUIRE_SETUP);
2609         case_WLAN(QSTA_TIMEOUT);
2610         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2611         case_WLAN(MESH_PEER_CANCELED);
2612         case_WLAN(MESH_MAX_PEERS);
2613         case_WLAN(MESH_CONFIG);
2614         case_WLAN(MESH_CLOSE);
2615         case_WLAN(MESH_MAX_RETRIES);
2616         case_WLAN(MESH_CONFIRM_TIMEOUT);
2617         case_WLAN(MESH_INVALID_GTK);
2618         case_WLAN(MESH_INCONSISTENT_PARAM);
2619         case_WLAN(MESH_INVALID_SECURITY);
2620         case_WLAN(MESH_PATH_ERROR);
2621         case_WLAN(MESH_PATH_NOFORWARD);
2622         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2623         case_WLAN(MAC_EXISTS_IN_MBSS);
2624         case_WLAN(MESH_CHAN_REGULATORY);
2625         case_WLAN(MESH_CHAN);
2626         default: return "<unknown>";
2627         }
2628 }
2629
2630 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2631                                      struct ieee80211_mgmt *mgmt, size_t len)
2632 {
2633         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2634         const u8 *bssid = NULL;
2635         u16 reason_code;
2636
2637         sdata_assert_lock(sdata);
2638
2639         if (len < 24 + 2)
2640                 return;
2641
2642         if (!ifmgd->associated ||
2643             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2644                 return;
2645
2646         bssid = ifmgd->associated->bssid;
2647
2648         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2649
2650         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2651                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2652
2653         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2654
2655         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2656 }
2657
2658
2659 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2660                                        struct ieee80211_mgmt *mgmt, size_t len)
2661 {
2662         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2663         u16 reason_code;
2664
2665         sdata_assert_lock(sdata);
2666
2667         if (len < 24 + 2)
2668                 return;
2669
2670         if (!ifmgd->associated ||
2671             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2672                 return;
2673
2674         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2675
2676         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2677                    mgmt->sa, reason_code);
2678
2679         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2680
2681         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2682 }
2683
2684 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2685                                 u8 *supp_rates, unsigned int supp_rates_len,
2686                                 u32 *rates, u32 *basic_rates,
2687                                 bool *have_higher_than_11mbit,
2688                                 int *min_rate, int *min_rate_index,
2689                                 int shift, u32 rate_flags)
2690 {
2691         int i, j;
2692
2693         for (i = 0; i < supp_rates_len; i++) {
2694                 int rate = supp_rates[i] & 0x7f;
2695                 bool is_basic = !!(supp_rates[i] & 0x80);
2696
2697                 if ((rate * 5 * (1 << shift)) > 110)
2698                         *have_higher_than_11mbit = true;
2699
2700                 /*
2701                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2702                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2703                  *
2704                  * Note: Even through the membership selector and the basic
2705                  *       rate flag share the same bit, they are not exactly
2706                  *       the same.
2707                  */
2708                 if (!!(supp_rates[i] & 0x80) &&
2709                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2710                         continue;
2711
2712                 for (j = 0; j < sband->n_bitrates; j++) {
2713                         struct ieee80211_rate *br;
2714                         int brate;
2715
2716                         br = &sband->bitrates[j];
2717                         if ((rate_flags & br->flags) != rate_flags)
2718                                 continue;
2719
2720                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2721                         if (brate == rate) {
2722                                 *rates |= BIT(j);
2723                                 if (is_basic)
2724                                         *basic_rates |= BIT(j);
2725                                 if ((rate * 5) < *min_rate) {
2726                                         *min_rate = rate * 5;
2727                                         *min_rate_index = j;
2728                                 }
2729                                 break;
2730                         }
2731                 }
2732         }
2733 }
2734
2735 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2736                                          bool assoc)
2737 {
2738         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2739
2740         sdata_assert_lock(sdata);
2741
2742         if (!assoc) {
2743                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2744
2745                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2746                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2747                 sdata->u.mgd.flags = 0;
2748                 mutex_lock(&sdata->local->mtx);
2749                 ieee80211_vif_release_channel(sdata);
2750                 mutex_unlock(&sdata->local->mtx);
2751         }
2752
2753         kfree(assoc_data);
2754         sdata->u.mgd.assoc_data = NULL;
2755 }
2756
2757 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2758                                     struct cfg80211_bss *cbss,
2759                                     struct ieee80211_mgmt *mgmt, size_t len)
2760 {
2761         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2762         struct ieee80211_local *local = sdata->local;
2763         struct ieee80211_supported_band *sband;
2764         struct sta_info *sta;
2765         u8 *pos;
2766         u16 capab_info, aid;
2767         struct ieee802_11_elems elems;
2768         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2769         const struct cfg80211_bss_ies *bss_ies = NULL;
2770         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2771         u32 changed = 0;
2772         int err;
2773         bool ret;
2774
2775         /* AssocResp and ReassocResp have identical structure */
2776
2777         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2778         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2779
2780         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2781                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2782                            aid);
2783         aid &= ~(BIT(15) | BIT(14));
2784
2785         ifmgd->broken_ap = false;
2786
2787         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2788                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2789                            aid);
2790                 aid = 0;
2791                 ifmgd->broken_ap = true;
2792         }
2793
2794         pos = mgmt->u.assoc_resp.variable;
2795         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2796
2797         if (!elems.supp_rates) {
2798                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2799                 return false;
2800         }
2801
2802         ifmgd->aid = aid;
2803
2804         /*
2805          * Some APs are erroneously not including some information in their
2806          * (re)association response frames. Try to recover by using the data
2807          * from the beacon or probe response. This seems to afflict mobile
2808          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2809          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2810          */
2811         if ((assoc_data->wmm && !elems.wmm_param) ||
2812             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2813              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2814             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2815              (!elems.vht_cap_elem || !elems.vht_operation))) {
2816                 const struct cfg80211_bss_ies *ies;
2817                 struct ieee802_11_elems bss_elems;
2818
2819                 rcu_read_lock();
2820                 ies = rcu_dereference(cbss->ies);
2821                 if (ies)
2822                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2823                                           GFP_ATOMIC);
2824                 rcu_read_unlock();
2825                 if (!bss_ies)
2826                         return false;
2827
2828                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2829                                        false, &bss_elems);
2830                 if (assoc_data->wmm &&
2831                     !elems.wmm_param && bss_elems.wmm_param) {
2832                         elems.wmm_param = bss_elems.wmm_param;
2833                         sdata_info(sdata,
2834                                    "AP bug: WMM param missing from AssocResp\n");
2835                 }
2836
2837                 /*
2838                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2839                  * have to include the IEs in the (re)association response.
2840                  */
2841                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2842                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2843                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2844                         sdata_info(sdata,
2845                                    "AP bug: HT capability missing from AssocResp\n");
2846                 }
2847                 if (!elems.ht_operation && bss_elems.ht_operation &&
2848                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2849                         elems.ht_operation = bss_elems.ht_operation;
2850                         sdata_info(sdata,
2851                                    "AP bug: HT operation missing from AssocResp\n");
2852                 }
2853                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2854                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2855                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2856                         sdata_info(sdata,
2857                                    "AP bug: VHT capa missing from AssocResp\n");
2858                 }
2859                 if (!elems.vht_operation && bss_elems.vht_operation &&
2860                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2861                         elems.vht_operation = bss_elems.vht_operation;
2862                         sdata_info(sdata,
2863                                    "AP bug: VHT operation missing from AssocResp\n");
2864                 }
2865         }
2866
2867         /*
2868          * We previously checked these in the beacon/probe response, so
2869          * they should be present here. This is just a safety net.
2870          */
2871         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2872             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2873                 sdata_info(sdata,
2874                            "HT AP is missing WMM params or HT capability/operation\n");
2875                 ret = false;
2876                 goto out;
2877         }
2878
2879         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2880             (!elems.vht_cap_elem || !elems.vht_operation)) {
2881                 sdata_info(sdata,
2882                            "VHT AP is missing VHT capability/operation\n");
2883                 ret = false;
2884                 goto out;
2885         }
2886
2887         mutex_lock(&sdata->local->sta_mtx);
2888         /*
2889          * station info was already allocated and inserted before
2890          * the association and should be available to us
2891          */
2892         sta = sta_info_get(sdata, cbss->bssid);
2893         if (WARN_ON(!sta)) {
2894                 mutex_unlock(&sdata->local->sta_mtx);
2895                 ret = false;
2896                 goto out;
2897         }
2898
2899         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2900
2901         /* Set up internal HT/VHT capabilities */
2902         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2903                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2904                                                   elems.ht_cap_elem, sta);
2905
2906         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2907                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2908                                                     elems.vht_cap_elem, sta);
2909
2910         /*
2911          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2912          * in their association response, so ignore that data for our own
2913          * configuration. If it changed since the last beacon, we'll get the
2914          * next beacon and update then.
2915          */
2916
2917         /*
2918          * If an operating mode notification IE is present, override the
2919          * NSS calculation (that would be done in rate_control_rate_init())
2920          * and use the # of streams from that element.
2921          */
2922         if (elems.opmode_notif &&
2923             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2924                 u8 nss;
2925
2926                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2927                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2928                 nss += 1;
2929                 sta->sta.rx_nss = nss;
2930         }
2931
2932         rate_control_rate_init(sta);
2933
2934         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2935                 set_sta_flag(sta, WLAN_STA_MFP);
2936
2937         sta->sta.wme = elems.wmm_param;
2938
2939         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2940         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2941                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2942         if (err) {
2943                 sdata_info(sdata,
2944                            "failed to move station %pM to desired state\n",
2945                            sta->sta.addr);
2946                 WARN_ON(__sta_info_destroy(sta));
2947                 mutex_unlock(&sdata->local->sta_mtx);
2948                 ret = false;
2949                 goto out;
2950         }
2951
2952         mutex_unlock(&sdata->local->sta_mtx);
2953
2954         /*
2955          * Always handle WMM once after association regardless
2956          * of the first value the AP uses. Setting -1 here has
2957          * that effect because the AP values is an unsigned
2958          * 4-bit value.
2959          */
2960         ifmgd->wmm_last_param_set = -1;
2961
2962         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2963                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2964                                          elems.wmm_param_len);
2965         else
2966                 ieee80211_set_wmm_default(sdata, false);
2967         changed |= BSS_CHANGED_QOS;
2968
2969         /* set AID and assoc capability,
2970          * ieee80211_set_associated() will tell the driver */
2971         bss_conf->aid = aid;
2972         bss_conf->assoc_capability = capab_info;
2973         ieee80211_set_associated(sdata, cbss, changed);
2974
2975         /*
2976          * If we're using 4-addr mode, let the AP know that we're
2977          * doing so, so that it can create the STA VLAN on its side
2978          */
2979         if (ifmgd->use_4addr)
2980                 ieee80211_send_4addr_nullfunc(local, sdata);
2981
2982         /*
2983          * Start timer to probe the connection to the AP now.
2984          * Also start the timer that will detect beacon loss.
2985          */
2986         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2987         ieee80211_sta_reset_beacon_monitor(sdata);
2988
2989         ret = true;
2990  out:
2991         kfree(bss_ies);
2992         return ret;
2993 }
2994
2995 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2996                                          struct ieee80211_mgmt *mgmt,
2997                                          size_t len)
2998 {
2999         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3000         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3001         u16 capab_info, status_code, aid;
3002         struct ieee802_11_elems elems;
3003         int ac, uapsd_queues = -1;
3004         u8 *pos;
3005         bool reassoc;
3006         struct cfg80211_bss *bss;
3007
3008         sdata_assert_lock(sdata);
3009
3010         if (!assoc_data)
3011                 return;
3012         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3013                 return;
3014
3015         /*
3016          * AssocResp and ReassocResp have identical structure, so process both
3017          * of them in this function.
3018          */
3019
3020         if (len < 24 + 6)
3021                 return;
3022
3023         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3024         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3025         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3026         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3027
3028         sdata_info(sdata,
3029                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3030                    reassoc ? "Rea" : "A", mgmt->sa,
3031                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3032
3033         pos = mgmt->u.assoc_resp.variable;
3034         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3035
3036         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3037             elems.timeout_int &&
3038             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3039                 u32 tu, ms;
3040                 tu = le32_to_cpu(elems.timeout_int->value);
3041                 ms = tu * 1024 / 1000;
3042                 sdata_info(sdata,
3043                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3044                            mgmt->sa, tu, ms);
3045                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3046                 assoc_data->timeout_started = true;
3047                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3048                         run_again(sdata, assoc_data->timeout);
3049                 return;
3050         }
3051
3052         bss = assoc_data->bss;
3053
3054         if (status_code != WLAN_STATUS_SUCCESS) {
3055                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3056                            mgmt->sa, status_code);
3057                 ieee80211_destroy_assoc_data(sdata, false);
3058         } else {
3059                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3060                         /* oops -- internal error -- send timeout for now */
3061                         ieee80211_destroy_assoc_data(sdata, false);
3062                         cfg80211_assoc_timeout(sdata->dev, bss);
3063                         return;
3064                 }
3065                 sdata_info(sdata, "associated\n");
3066
3067                 /*
3068                  * destroy assoc_data afterwards, as otherwise an idle
3069                  * recalc after assoc_data is NULL but before associated
3070                  * is set can cause the interface to go idle
3071                  */
3072                 ieee80211_destroy_assoc_data(sdata, true);
3073
3074                 /* get uapsd queues configuration */
3075                 uapsd_queues = 0;
3076                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3077                         if (sdata->tx_conf[ac].uapsd)
3078                                 uapsd_queues |= BIT(ac);
3079         }
3080
3081         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3082 }
3083
3084 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3085                                   struct ieee80211_mgmt *mgmt, size_t len,
3086                                   struct ieee80211_rx_status *rx_status,
3087                                   struct ieee802_11_elems *elems)
3088 {
3089         struct ieee80211_local *local = sdata->local;
3090         struct ieee80211_bss *bss;
3091         struct ieee80211_channel *channel;
3092
3093         sdata_assert_lock(sdata);
3094
3095         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3096         if (!channel)
3097                 return;
3098
3099         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3100                                         channel);
3101         if (bss) {
3102                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3103                 ieee80211_rx_bss_put(local, bss);
3104         }
3105 }
3106
3107
3108 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3109                                          struct sk_buff *skb)
3110 {
3111         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3112         struct ieee80211_if_managed *ifmgd;
3113         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3114         size_t baselen, len = skb->len;
3115         struct ieee802_11_elems elems;
3116
3117         ifmgd = &sdata->u.mgd;
3118
3119         sdata_assert_lock(sdata);
3120
3121         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3122                 return; /* ignore ProbeResp to foreign address */
3123
3124         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3125         if (baselen > len)
3126                 return;
3127
3128         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3129                                false, &elems);
3130
3131         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3132
3133         if (ifmgd->associated &&
3134             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3135                 ieee80211_reset_ap_probe(sdata);
3136
3137         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3138             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3139                 /* got probe response, continue with auth */
3140                 sdata_info(sdata, "direct probe responded\n");
3141                 ifmgd->auth_data->tries = 0;
3142                 ifmgd->auth_data->timeout = jiffies;
3143                 ifmgd->auth_data->timeout_started = true;
3144                 run_again(sdata, ifmgd->auth_data->timeout);
3145         }
3146 }
3147
3148 /*
3149  * This is the canonical list of information elements we care about,
3150  * the filter code also gives us all changes to the Microsoft OUI
3151  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3152  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3153  * changes to requested client power.
3154  *
3155  * We implement beacon filtering in software since that means we can
3156  * avoid processing the frame here and in cfg80211, and userspace
3157  * will not be able to tell whether the hardware supports it or not.
3158  *
3159  * XXX: This list needs to be dynamic -- userspace needs to be able to
3160  *      add items it requires. It also needs to be able to tell us to
3161  *      look out for other vendor IEs.
3162  */
3163 static const u64 care_about_ies =
3164         (1ULL << WLAN_EID_COUNTRY) |
3165         (1ULL << WLAN_EID_ERP_INFO) |
3166         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3167         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3168         (1ULL << WLAN_EID_HT_CAPABILITY) |
3169         (1ULL << WLAN_EID_HT_OPERATION);
3170
3171 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3172                                      struct ieee80211_mgmt *mgmt, size_t len,
3173                                      struct ieee80211_rx_status *rx_status)
3174 {
3175         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3176         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3177         size_t baselen;
3178         struct ieee802_11_elems elems;
3179         struct ieee80211_local *local = sdata->local;
3180         struct ieee80211_chanctx_conf *chanctx_conf;
3181         struct ieee80211_channel *chan;
3182         struct sta_info *sta;
3183         u32 changed = 0;
3184         bool erp_valid;
3185         u8 erp_value = 0;
3186         u32 ncrc;
3187         u8 *bssid;
3188         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3189
3190         sdata_assert_lock(sdata);
3191
3192         /* Process beacon from the current BSS */
3193         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3194         if (baselen > len)
3195                 return;
3196
3197         rcu_read_lock();
3198         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3199         if (!chanctx_conf) {
3200                 rcu_read_unlock();
3201                 return;
3202         }
3203
3204         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3205                 rcu_read_unlock();
3206                 return;
3207         }
3208         chan = chanctx_conf->def.chan;
3209         rcu_read_unlock();
3210
3211         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3212             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3213                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3214                                        len - baselen, false, &elems);
3215
3216                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3217                 if (elems.tim && !elems.parse_error) {
3218                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3219                         ifmgd->dtim_period = tim_ie->dtim_period;
3220                 }
3221                 ifmgd->have_beacon = true;
3222                 ifmgd->assoc_data->need_beacon = false;
3223                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3224                         sdata->vif.bss_conf.sync_tsf =
3225                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3226                         sdata->vif.bss_conf.sync_device_ts =
3227                                 rx_status->device_timestamp;
3228                         if (elems.tim)
3229                                 sdata->vif.bss_conf.sync_dtim_count =
3230                                         elems.tim->dtim_count;
3231                         else
3232                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3233                 }
3234                 /* continue assoc process */
3235                 ifmgd->assoc_data->timeout = jiffies;
3236                 ifmgd->assoc_data->timeout_started = true;
3237                 run_again(sdata, ifmgd->assoc_data->timeout);
3238                 return;
3239         }
3240
3241         if (!ifmgd->associated ||
3242             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3243                 return;
3244         bssid = ifmgd->associated->bssid;
3245
3246         /* Track average RSSI from the Beacon frames of the current AP */
3247         ifmgd->last_beacon_signal = rx_status->signal;
3248         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3249                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3250                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3251                 ifmgd->last_cqm_event_signal = 0;
3252                 ifmgd->count_beacon_signal = 1;
3253                 ifmgd->last_ave_beacon_signal = 0;
3254         } else {
3255                 ifmgd->ave_beacon_signal =
3256                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3257                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3258                          ifmgd->ave_beacon_signal) / 16;
3259                 ifmgd->count_beacon_signal++;
3260         }
3261
3262         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3263             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3264                 int sig = ifmgd->ave_beacon_signal;
3265                 int last_sig = ifmgd->last_ave_beacon_signal;
3266
3267                 /*
3268                  * if signal crosses either of the boundaries, invoke callback
3269                  * with appropriate parameters
3270                  */
3271                 if (sig > ifmgd->rssi_max_thold &&
3272                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3273                         ifmgd->last_ave_beacon_signal = sig;
3274                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3275                 } else if (sig < ifmgd->rssi_min_thold &&
3276                            (last_sig >= ifmgd->rssi_max_thold ||
3277                            last_sig == 0)) {
3278                         ifmgd->last_ave_beacon_signal = sig;
3279                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3280                 }
3281         }
3282
3283         if (bss_conf->cqm_rssi_thold &&
3284             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3285             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3286                 int sig = ifmgd->ave_beacon_signal / 16;
3287                 int last_event = ifmgd->last_cqm_event_signal;
3288                 int thold = bss_conf->cqm_rssi_thold;
3289                 int hyst = bss_conf->cqm_rssi_hyst;
3290                 if (sig < thold &&
3291                     (last_event == 0 || sig < last_event - hyst)) {
3292                         ifmgd->last_cqm_event_signal = sig;
3293                         ieee80211_cqm_rssi_notify(
3294                                 &sdata->vif,
3295                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3296                                 GFP_KERNEL);
3297                 } else if (sig > thold &&
3298                            (last_event == 0 || sig > last_event + hyst)) {
3299                         ifmgd->last_cqm_event_signal = sig;
3300                         ieee80211_cqm_rssi_notify(
3301                                 &sdata->vif,
3302                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3303                                 GFP_KERNEL);
3304                 }
3305         }
3306
3307         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3308                 mlme_dbg_ratelimited(sdata,
3309                                      "cancelling AP probe due to a received beacon\n");
3310                 ieee80211_reset_ap_probe(sdata);
3311         }
3312
3313         /*
3314          * Push the beacon loss detection into the future since
3315          * we are processing a beacon from the AP just now.
3316          */
3317         ieee80211_sta_reset_beacon_monitor(sdata);
3318
3319         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3320         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3321                                           len - baselen, false, &elems,
3322                                           care_about_ies, ncrc);
3323
3324         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3325                 bool directed_tim = ieee80211_check_tim(elems.tim,
3326                                                         elems.tim_len,
3327                                                         ifmgd->aid);
3328                 if (directed_tim) {
3329                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3330                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3331                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3332                                         ieee80211_hw_config(local,
3333                                                             IEEE80211_CONF_CHANGE_PS);
3334                                 }
3335                                 ieee80211_send_nullfunc(local, sdata, 0);
3336                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3337                                 local->pspolling = true;
3338
3339                                 /*
3340                                  * Here is assumed that the driver will be
3341                                  * able to send ps-poll frame and receive a
3342                                  * response even though power save mode is
3343                                  * enabled, but some drivers might require
3344                                  * to disable power save here. This needs
3345                                  * to be investigated.
3346                                  */
3347                                 ieee80211_send_pspoll(local, sdata);
3348                         }
3349                 }
3350         }
3351
3352         if (sdata->vif.p2p) {
3353                 struct ieee80211_p2p_noa_attr noa = {};
3354                 int ret;
3355
3356                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3357                                             len - baselen,
3358                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3359                                             (u8 *) &noa, sizeof(noa));
3360                 if (ret >= 2) {
3361                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3362                                 /* valid noa_attr and index changed */
3363                                 sdata->u.mgd.p2p_noa_index = noa.index;
3364                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3365                                 changed |= BSS_CHANGED_P2P_PS;
3366                                 /*
3367                                  * make sure we update all information, the CRC
3368                                  * mechanism doesn't look at P2P attributes.
3369                                  */
3370                                 ifmgd->beacon_crc_valid = false;
3371                         }
3372                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3373                         /* noa_attr not found and we had valid noa_attr before */
3374                         sdata->u.mgd.p2p_noa_index = -1;
3375                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3376                         changed |= BSS_CHANGED_P2P_PS;
3377                         ifmgd->beacon_crc_valid = false;
3378                 }
3379         }
3380
3381         if (ifmgd->csa_waiting_bcn)
3382                 ieee80211_chswitch_post_beacon(sdata);
3383
3384         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3385                 return;
3386         ifmgd->beacon_crc = ncrc;
3387         ifmgd->beacon_crc_valid = true;
3388
3389         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3390
3391         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3392                                          rx_status->device_timestamp,
3393                                          &elems, true);
3394
3395         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3396             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3397                                      elems.wmm_param_len))
3398                 changed |= BSS_CHANGED_QOS;
3399
3400         /*
3401          * If we haven't had a beacon before, tell the driver about the
3402          * DTIM period (and beacon timing if desired) now.
3403          */
3404         if (!ifmgd->have_beacon) {
3405                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3406                 if (elems.tim)
3407                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3408                 else
3409                         bss_conf->dtim_period = 1;
3410
3411                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3412                         sdata->vif.bss_conf.sync_tsf =
3413                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3414                         sdata->vif.bss_conf.sync_device_ts =
3415                                 rx_status->device_timestamp;
3416                         if (elems.tim)
3417                                 sdata->vif.bss_conf.sync_dtim_count =
3418                                         elems.tim->dtim_count;
3419                         else
3420                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3421                 }
3422
3423                 changed |= BSS_CHANGED_BEACON_INFO;
3424                 ifmgd->have_beacon = true;
3425
3426                 mutex_lock(&local->iflist_mtx);
3427                 ieee80211_recalc_ps(local, -1);
3428                 mutex_unlock(&local->iflist_mtx);
3429
3430                 ieee80211_recalc_ps_vif(sdata);
3431         }
3432
3433         if (elems.erp_info) {
3434                 erp_valid = true;
3435                 erp_value = elems.erp_info[0];
3436         } else {
3437                 erp_valid = false;
3438         }
3439         changed |= ieee80211_handle_bss_capability(sdata,
3440                         le16_to_cpu(mgmt->u.beacon.capab_info),
3441                         erp_valid, erp_value);
3442
3443         mutex_lock(&local->sta_mtx);
3444         sta = sta_info_get(sdata, bssid);
3445
3446         if (ieee80211_config_bw(sdata, sta,
3447                                 elems.ht_cap_elem, elems.ht_operation,
3448                                 elems.vht_operation, bssid, &changed)) {
3449                 mutex_unlock(&local->sta_mtx);
3450                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3451                                        WLAN_REASON_DEAUTH_LEAVING,
3452                                        true, deauth_buf);
3453                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3454                                       sizeof(deauth_buf));
3455                 return;
3456         }
3457
3458         if (sta && elems.opmode_notif)
3459                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3460                                             rx_status->band, true);
3461         mutex_unlock(&local->sta_mtx);
3462
3463         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3464                                                elems.country_elem,
3465                                                elems.country_elem_len,
3466                                                elems.pwr_constr_elem,
3467                                                elems.cisco_dtpc_elem);
3468
3469         ieee80211_bss_info_change_notify(sdata, changed);
3470 }
3471
3472 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3473                                   struct sk_buff *skb)
3474 {
3475         struct ieee80211_rx_status *rx_status;
3476         struct ieee80211_mgmt *mgmt;
3477         u16 fc;
3478         struct ieee802_11_elems elems;
3479         int ies_len;
3480
3481         rx_status = (struct ieee80211_rx_status *) skb->cb;
3482         mgmt = (struct ieee80211_mgmt *) skb->data;
3483         fc = le16_to_cpu(mgmt->frame_control);
3484
3485         sdata_lock(sdata);
3486
3487         switch (fc & IEEE80211_FCTL_STYPE) {
3488         case IEEE80211_STYPE_BEACON:
3489                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3490                 break;
3491         case IEEE80211_STYPE_PROBE_RESP:
3492                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3493                 break;
3494         case IEEE80211_STYPE_AUTH:
3495                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3496                 break;
3497         case IEEE80211_STYPE_DEAUTH:
3498                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3499                 break;
3500         case IEEE80211_STYPE_DISASSOC:
3501                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3502                 break;
3503         case IEEE80211_STYPE_ASSOC_RESP:
3504         case IEEE80211_STYPE_REASSOC_RESP:
3505                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3506                 break;
3507         case IEEE80211_STYPE_ACTION:
3508                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3509                         ies_len = skb->len -
3510                                   offsetof(struct ieee80211_mgmt,
3511                                            u.action.u.chan_switch.variable);
3512
3513                         if (ies_len < 0)
3514                                 break;
3515
3516                         ieee802_11_parse_elems(
3517                                 mgmt->u.action.u.chan_switch.variable,
3518                                 ies_len, true, &elems);
3519
3520                         if (elems.parse_error)
3521                                 break;
3522
3523                         ieee80211_sta_process_chanswitch(sdata,
3524                                                  rx_status->mactime,
3525                                                  rx_status->device_timestamp,
3526                                                  &elems, false);
3527                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3528                         ies_len = skb->len -
3529                                   offsetof(struct ieee80211_mgmt,
3530                                            u.action.u.ext_chan_switch.variable);
3531
3532                         if (ies_len < 0)
3533                                 break;
3534
3535                         ieee802_11_parse_elems(
3536                                 mgmt->u.action.u.ext_chan_switch.variable,
3537                                 ies_len, true, &elems);
3538
3539                         if (elems.parse_error)
3540                                 break;
3541
3542                         /* for the handling code pretend this was also an IE */
3543                         elems.ext_chansw_ie =
3544                                 &mgmt->u.action.u.ext_chan_switch.data;
3545
3546                         ieee80211_sta_process_chanswitch(sdata,
3547                                                  rx_status->mactime,
3548                                                  rx_status->device_timestamp,
3549                                                  &elems, false);
3550                 }
3551                 break;
3552         }
3553         sdata_unlock(sdata);
3554 }
3555
3556 static void ieee80211_sta_timer(unsigned long data)
3557 {
3558         struct ieee80211_sub_if_data *sdata =
3559                 (struct ieee80211_sub_if_data *) data;
3560
3561         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3562 }
3563
3564 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3565                                           u8 *bssid, u8 reason, bool tx)
3566 {
3567         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3568
3569         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3570                                tx, frame_buf);
3571
3572         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3573                               IEEE80211_DEAUTH_FRAME_LEN);
3574 }
3575
3576 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3577 {
3578         struct ieee80211_local *local = sdata->local;
3579         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3580         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3581         u32 tx_flags = 0;
3582
3583         sdata_assert_lock(sdata);
3584
3585         if (WARN_ON_ONCE(!auth_data))
3586                 return -EINVAL;
3587
3588         auth_data->tries++;
3589
3590         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3591                 sdata_info(sdata, "authentication with %pM timed out\n",
3592                            auth_data->bss->bssid);
3593
3594                 /*
3595                  * Most likely AP is not in the range so remove the
3596                  * bss struct for that AP.
3597                  */
3598                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3599
3600                 return -ETIMEDOUT;
3601         }
3602
3603         drv_mgd_prepare_tx(local, sdata);
3604
3605         if (auth_data->bss->proberesp_ies) {
3606                 u16 trans = 1;
3607                 u16 status = 0;
3608
3609                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3610                            auth_data->bss->bssid, auth_data->tries,
3611                            IEEE80211_AUTH_MAX_TRIES);
3612
3613                 auth_data->expected_transaction = 2;
3614
3615                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3616                         trans = auth_data->sae_trans;
3617                         status = auth_data->sae_status;
3618                         auth_data->expected_transaction = trans;
3619                 }
3620
3621                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3622                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3623                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3624
3625                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3626                                     auth_data->data, auth_data->data_len,
3627                                     auth_data->bss->bssid,
3628                                     auth_data->bss->bssid, NULL, 0, 0,
3629                                     tx_flags);
3630         } else {
3631                 const u8 *ssidie;
3632
3633                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3634                            auth_data->bss->bssid, auth_data->tries,
3635                            IEEE80211_AUTH_MAX_TRIES);
3636
3637                 rcu_read_lock();
3638                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3639                 if (!ssidie) {
3640                         rcu_read_unlock();
3641                         return -EINVAL;
3642                 }
3643                 /*
3644                  * Direct probe is sent to broadcast address as some APs
3645                  * will not answer to direct packet in unassociated state.
3646                  */
3647                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3648                                          NULL, 0, (u32) -1, true, 0,
3649                                          auth_data->bss->channel, false);
3650                 rcu_read_unlock();
3651         }
3652
3653         if (tx_flags == 0) {
3654                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3655                 auth_data->timeout_started = true;
3656                 run_again(sdata, auth_data->timeout);
3657         } else {
3658                 auth_data->timeout =
3659                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3660                 auth_data->timeout_started = true;
3661                 run_again(sdata, auth_data->timeout);
3662         }
3663
3664         return 0;
3665 }
3666
3667 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3668 {
3669         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3670         struct ieee80211_local *local = sdata->local;
3671
3672         sdata_assert_lock(sdata);
3673
3674         assoc_data->tries++;
3675         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3676                 sdata_info(sdata, "association with %pM timed out\n",
3677                            assoc_data->bss->bssid);
3678
3679                 /*
3680                  * Most likely AP is not in the range so remove the
3681                  * bss struct for that AP.
3682                  */
3683                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3684
3685                 return -ETIMEDOUT;
3686         }
3687
3688         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3689                    assoc_data->bss->bssid, assoc_data->tries,
3690                    IEEE80211_ASSOC_MAX_TRIES);
3691         ieee80211_send_assoc(sdata);
3692
3693         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3694                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3695                 assoc_data->timeout_started = true;
3696                 run_again(sdata, assoc_data->timeout);
3697         } else {
3698                 assoc_data->timeout =
3699                         round_jiffies_up(jiffies +
3700                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3701                 assoc_data->timeout_started = true;
3702                 run_again(sdata, assoc_data->timeout);
3703         }
3704
3705         return 0;
3706 }
3707
3708 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3709                                   __le16 fc, bool acked)
3710 {
3711         struct ieee80211_local *local = sdata->local;
3712
3713         sdata->u.mgd.status_fc = fc;
3714         sdata->u.mgd.status_acked = acked;
3715         sdata->u.mgd.status_received = true;
3716
3717         ieee80211_queue_work(&local->hw, &sdata->work);
3718 }
3719
3720 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3721 {
3722         struct ieee80211_local *local = sdata->local;
3723         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3724
3725         sdata_lock(sdata);
3726
3727         if (ifmgd->status_received) {
3728                 __le16 fc = ifmgd->status_fc;
3729                 bool status_acked = ifmgd->status_acked;
3730
3731                 ifmgd->status_received = false;
3732                 if (ifmgd->auth_data &&
3733                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3734                         if (status_acked) {
3735                                 ifmgd->auth_data->timeout =
3736                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3737                                 run_again(sdata, ifmgd->auth_data->timeout);
3738                         } else {
3739                                 ifmgd->auth_data->timeout = jiffies - 1;
3740                         }
3741                         ifmgd->auth_data->timeout_started = true;
3742                 } else if (ifmgd->assoc_data &&
3743                            (ieee80211_is_assoc_req(fc) ||
3744                             ieee80211_is_reassoc_req(fc))) {
3745                         if (status_acked) {
3746                                 ifmgd->assoc_data->timeout =
3747                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3748                                 run_again(sdata, ifmgd->assoc_data->timeout);
3749                         } else {
3750                                 ifmgd->assoc_data->timeout = jiffies - 1;
3751                         }
3752                         ifmgd->assoc_data->timeout_started = true;
3753                 }
3754         }
3755
3756         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3757             time_after(jiffies, ifmgd->auth_data->timeout)) {
3758                 if (ifmgd->auth_data->done) {
3759                         /*
3760                          * ok ... we waited for assoc but userspace didn't,
3761                          * so let's just kill the auth data
3762                          */
3763                         ieee80211_destroy_auth_data(sdata, false);
3764                 } else if (ieee80211_probe_auth(sdata)) {
3765                         u8 bssid[ETH_ALEN];
3766
3767                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3768
3769                         ieee80211_destroy_auth_data(sdata, false);
3770
3771                         cfg80211_auth_timeout(sdata->dev, bssid);
3772                 }
3773         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3774                 run_again(sdata, ifmgd->auth_data->timeout);
3775
3776         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3777             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3778                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3779                     ieee80211_do_assoc(sdata)) {
3780                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3781
3782                         ieee80211_destroy_assoc_data(sdata, false);
3783                         cfg80211_assoc_timeout(sdata->dev, bss);
3784                 }
3785         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3786                 run_again(sdata, ifmgd->assoc_data->timeout);
3787
3788         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3789             ifmgd->associated) {
3790                 u8 bssid[ETH_ALEN];
3791                 int max_tries;
3792
3793                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3794
3795                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3796                         max_tries = max_nullfunc_tries;
3797                 else
3798                         max_tries = max_probe_tries;
3799
3800                 /* ACK received for nullfunc probing frame */
3801                 if (!ifmgd->probe_send_count)
3802                         ieee80211_reset_ap_probe(sdata);
3803                 else if (ifmgd->nullfunc_failed) {
3804                         if (ifmgd->probe_send_count < max_tries) {
3805                                 mlme_dbg(sdata,
3806                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3807                                          bssid, ifmgd->probe_send_count,
3808                                          max_tries);
3809                                 ieee80211_mgd_probe_ap_send(sdata);
3810                         } else {
3811                                 mlme_dbg(sdata,
3812                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3813                                          bssid);
3814                                 ieee80211_sta_connection_lost(sdata, bssid,
3815                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3816                                         false);
3817                         }
3818                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3819                         run_again(sdata, ifmgd->probe_timeout);
3820                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3821                         mlme_dbg(sdata,
3822                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3823                                  bssid, probe_wait_ms);
3824                         ieee80211_sta_connection_lost(sdata, bssid,
3825                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3826                 } else if (ifmgd->probe_send_count < max_tries) {
3827                         mlme_dbg(sdata,
3828                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3829                                  bssid, probe_wait_ms,
3830                                  ifmgd->probe_send_count, max_tries);
3831                         ieee80211_mgd_probe_ap_send(sdata);
3832                 } else {
3833                         /*
3834                          * We actually lost the connection ... or did we?
3835                          * Let's make sure!
3836                          */
3837                         wiphy_debug(local->hw.wiphy,
3838                                     "%s: No probe response from AP %pM"
3839                                     " after %dms, disconnecting.\n",
3840                                     sdata->name,
3841                                     bssid, probe_wait_ms);
3842
3843                         ieee80211_sta_connection_lost(sdata, bssid,
3844                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3845                 }
3846         }
3847
3848         sdata_unlock(sdata);
3849 }
3850
3851 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3852 {
3853         struct ieee80211_sub_if_data *sdata =
3854                 (struct ieee80211_sub_if_data *) data;
3855         struct ieee80211_local *local = sdata->local;
3856         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3857
3858         if (local->quiescing)
3859                 return;
3860
3861         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3862                 return;
3863
3864         sdata->u.mgd.connection_loss = false;
3865         ieee80211_queue_work(&sdata->local->hw,
3866                              &sdata->u.mgd.beacon_connection_loss_work);
3867 }
3868
3869 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3870 {
3871         struct ieee80211_sub_if_data *sdata =
3872                 (struct ieee80211_sub_if_data *) data;
3873         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3874         struct ieee80211_local *local = sdata->local;
3875
3876         if (local->quiescing)
3877                 return;
3878
3879         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3880                 return;
3881
3882         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3883 }
3884
3885 static void ieee80211_sta_monitor_work(struct work_struct *work)
3886 {
3887         struct ieee80211_sub_if_data *sdata =
3888                 container_of(work, struct ieee80211_sub_if_data,
3889                              u.mgd.monitor_work);
3890
3891         ieee80211_mgd_probe_ap(sdata, false);
3892 }
3893
3894 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3895 {
3896         u32 flags;
3897
3898         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3899                 __ieee80211_stop_poll(sdata);
3900
3901                 /* let's probe the connection once */
3902                 flags = sdata->local->hw.flags;
3903                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3904                         ieee80211_queue_work(&sdata->local->hw,
3905                                              &sdata->u.mgd.monitor_work);
3906                 /* and do all the other regular work too */
3907                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3908         }
3909 }
3910
3911 #ifdef CONFIG_PM
3912 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3913 {
3914         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3915         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3916
3917         sdata_lock(sdata);
3918
3919         if (ifmgd->auth_data || ifmgd->assoc_data) {
3920                 const u8 *bssid = ifmgd->auth_data ?
3921                                 ifmgd->auth_data->bss->bssid :
3922                                 ifmgd->assoc_data->bss->bssid;
3923
3924                 /*
3925                  * If we are trying to authenticate / associate while suspending,
3926                  * cfg80211 won't know and won't actually abort those attempts,
3927                  * thus we need to do that ourselves.
3928                  */
3929                 ieee80211_send_deauth_disassoc(sdata, bssid,
3930                                                IEEE80211_STYPE_DEAUTH,
3931                                                WLAN_REASON_DEAUTH_LEAVING,
3932                                                false, frame_buf);
3933                 if (ifmgd->assoc_data)
3934                         ieee80211_destroy_assoc_data(sdata, false);
3935                 if (ifmgd->auth_data)
3936                         ieee80211_destroy_auth_data(sdata, false);
3937                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3938                                       IEEE80211_DEAUTH_FRAME_LEN);
3939         }
3940
3941         sdata_unlock(sdata);
3942 }
3943
3944 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3945 {
3946         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3947
3948         sdata_lock(sdata);
3949         if (!ifmgd->associated) {
3950                 sdata_unlock(sdata);
3951                 return;
3952         }
3953
3954         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3955                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3956                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3957                 ieee80211_sta_connection_lost(sdata,
3958                                               ifmgd->associated->bssid,
3959                                               WLAN_REASON_UNSPECIFIED,
3960                                               true);
3961                 sdata_unlock(sdata);
3962                 return;
3963         }
3964         sdata_unlock(sdata);
3965 }
3966 #endif
3967
3968 /* interface setup */
3969 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3970 {
3971         struct ieee80211_if_managed *ifmgd;
3972
3973         ifmgd = &sdata->u.mgd;
3974         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3975         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3976         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3977                   ieee80211_beacon_connection_loss_work);
3978         INIT_WORK(&ifmgd->csa_connection_drop_work,
3979                   ieee80211_csa_connection_drop_work);
3980         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3981         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
3982                           ieee80211_tdls_peer_del_work);
3983         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3984                     (unsigned long) sdata);
3985         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3986                     (unsigned long) sdata);
3987         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3988                     (unsigned long) sdata);
3989         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3990                     (unsigned long) sdata);
3991         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
3992                           ieee80211_sta_handle_tspec_ac_params_wk);
3993
3994         ifmgd->flags = 0;
3995         ifmgd->powersave = sdata->wdev.ps;
3996         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3997         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3998         ifmgd->p2p_noa_index = -1;
3999
4000         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4001                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4002         else
4003                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4004 }
4005
4006 /* scan finished notification */
4007 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4008 {
4009         struct ieee80211_sub_if_data *sdata;
4010
4011         /* Restart STA timers */
4012         rcu_read_lock();
4013         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4014                 if (ieee80211_sdata_running(sdata))
4015                         ieee80211_restart_sta_timer(sdata);
4016         }
4017         rcu_read_unlock();
4018 }
4019
4020 int ieee80211_max_network_latency(struct notifier_block *nb,
4021                                   unsigned long data, void *dummy)
4022 {
4023         s32 latency_usec = (s32) data;
4024         struct ieee80211_local *local =
4025                 container_of(nb, struct ieee80211_local,
4026                              network_latency_notifier);
4027
4028         mutex_lock(&local->iflist_mtx);
4029         ieee80211_recalc_ps(local, latency_usec);
4030         mutex_unlock(&local->iflist_mtx);
4031
4032         return NOTIFY_OK;
4033 }
4034
4035 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4036                                      struct cfg80211_bss *cbss)
4037 {
4038         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4039         const u8 *ht_cap_ie, *vht_cap_ie;
4040         const struct ieee80211_ht_cap *ht_cap;
4041         const struct ieee80211_vht_cap *vht_cap;
4042         u8 chains = 1;
4043
4044         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4045                 return chains;
4046
4047         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4048         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4049                 ht_cap = (void *)(ht_cap_ie + 2);
4050                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4051                 /*
4052                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4053                  *       "Tx Unequal Modulation Supported" fields.
4054                  */
4055         }
4056
4057         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4058                 return chains;
4059
4060         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4061         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4062                 u8 nss;
4063                 u16 tx_mcs_map;
4064
4065                 vht_cap = (void *)(vht_cap_ie + 2);
4066                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4067                 for (nss = 8; nss > 0; nss--) {
4068                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4069                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4070                                 break;
4071                 }
4072                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4073                 chains = max(chains, nss);
4074         }
4075
4076         return chains;
4077 }
4078
4079 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4080                                   struct cfg80211_bss *cbss)
4081 {
4082         struct ieee80211_local *local = sdata->local;
4083         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4084         const struct ieee80211_ht_cap *ht_cap = NULL;
4085         const struct ieee80211_ht_operation *ht_oper = NULL;
4086         const struct ieee80211_vht_operation *vht_oper = NULL;
4087         struct ieee80211_supported_band *sband;
4088         struct cfg80211_chan_def chandef;
4089         int ret;
4090
4091         sband = local->hw.wiphy->bands[cbss->channel->band];
4092
4093         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4094                           IEEE80211_STA_DISABLE_80P80MHZ |
4095                           IEEE80211_STA_DISABLE_160MHZ);
4096
4097         rcu_read_lock();
4098
4099         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4100             sband->ht_cap.ht_supported) {
4101                 const u8 *ht_oper_ie, *ht_cap_ie;
4102
4103                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4104                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4105                         ht_oper = (void *)(ht_oper_ie + 2);
4106
4107                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4108                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4109                         ht_cap = (void *)(ht_cap_ie + 2);
4110
4111                 if (!ht_cap) {
4112                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4113                         ht_oper = NULL;
4114                 }
4115         }
4116
4117         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4118             sband->vht_cap.vht_supported) {
4119                 const u8 *vht_oper_ie, *vht_cap;
4120
4121                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4122                                                    WLAN_EID_VHT_OPERATION);
4123                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4124                         vht_oper = (void *)(vht_oper_ie + 2);
4125                 if (vht_oper && !ht_oper) {
4126                         vht_oper = NULL;
4127                         sdata_info(sdata,
4128                                    "AP advertised VHT without HT, disabling both\n");
4129                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4130                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4131                 }
4132
4133                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4134                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4135                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4136                         vht_oper = NULL;
4137                 }
4138         }
4139
4140         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4141                                                      cbss->channel,
4142                                                      ht_cap, ht_oper, vht_oper,
4143                                                      &chandef, false);
4144
4145         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4146                                       local->rx_chains);
4147
4148         rcu_read_unlock();
4149
4150         /* will change later if needed */
4151         sdata->smps_mode = IEEE80211_SMPS_OFF;
4152
4153         mutex_lock(&local->mtx);
4154         /*
4155          * If this fails (possibly due to channel context sharing
4156          * on incompatible channels, e.g. 80+80 and 160 sharing the
4157          * same control channel) try to use a smaller bandwidth.
4158          */
4159         ret = ieee80211_vif_use_channel(sdata, &chandef,
4160                                         IEEE80211_CHANCTX_SHARED);
4161
4162         /* don't downgrade for 5 and 10 MHz channels, though. */
4163         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4164             chandef.width == NL80211_CHAN_WIDTH_10)
4165                 goto out;
4166
4167         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4168                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4169                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4170                                                 IEEE80211_CHANCTX_SHARED);
4171         }
4172  out:
4173         mutex_unlock(&local->mtx);
4174         return ret;
4175 }
4176
4177 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4178                                      struct cfg80211_bss *cbss, bool assoc)
4179 {
4180         struct ieee80211_local *local = sdata->local;
4181         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4182         struct ieee80211_bss *bss = (void *)cbss->priv;
4183         struct sta_info *new_sta = NULL;
4184         bool have_sta = false;
4185         int err;
4186
4187         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4188                 return -EINVAL;
4189
4190         if (assoc) {
4191                 rcu_read_lock();
4192                 have_sta = sta_info_get(sdata, cbss->bssid);
4193                 rcu_read_unlock();
4194         }
4195
4196         if (!have_sta) {
4197                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4198                 if (!new_sta)
4199                         return -ENOMEM;
4200         }
4201         if (new_sta) {
4202                 u32 rates = 0, basic_rates = 0;
4203                 bool have_higher_than_11mbit;
4204                 int min_rate = INT_MAX, min_rate_index = -1;
4205                 struct ieee80211_chanctx_conf *chanctx_conf;
4206                 struct ieee80211_supported_band *sband;
4207                 const struct cfg80211_bss_ies *ies;
4208                 int shift;
4209                 u32 rate_flags;
4210
4211                 sband = local->hw.wiphy->bands[cbss->channel->band];
4212
4213                 err = ieee80211_prep_channel(sdata, cbss);
4214                 if (err) {
4215                         sta_info_free(local, new_sta);
4216                         return -EINVAL;
4217                 }
4218                 shift = ieee80211_vif_get_shift(&sdata->vif);
4219
4220                 rcu_read_lock();
4221                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4222                 if (WARN_ON(!chanctx_conf)) {
4223                         rcu_read_unlock();
4224                         sta_info_free(local, new_sta);
4225                         return -EINVAL;
4226                 }
4227                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4228                 rcu_read_unlock();
4229
4230                 ieee80211_get_rates(sband, bss->supp_rates,
4231                                     bss->supp_rates_len,
4232                                     &rates, &basic_rates,
4233                                     &have_higher_than_11mbit,
4234                                     &min_rate, &min_rate_index,
4235                                     shift, rate_flags);
4236
4237                 /*
4238                  * This used to be a workaround for basic rates missing
4239                  * in the association response frame. Now that we no
4240                  * longer use the basic rates from there, it probably
4241                  * doesn't happen any more, but keep the workaround so
4242                  * in case some *other* APs are buggy in different ways
4243                  * we can connect -- with a warning.
4244                  */
4245                 if (!basic_rates && min_rate_index >= 0) {
4246                         sdata_info(sdata,
4247                                    "No basic rates, using min rate instead\n");
4248                         basic_rates = BIT(min_rate_index);
4249                 }
4250
4251                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4252                 sdata->vif.bss_conf.basic_rates = basic_rates;
4253
4254                 /* cf. IEEE 802.11 9.2.12 */
4255                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4256                     have_higher_than_11mbit)
4257                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4258                 else
4259                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4260
4261                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4262
4263                 /* set timing information */
4264                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4265                 rcu_read_lock();
4266                 ies = rcu_dereference(cbss->beacon_ies);
4267                 if (ies) {
4268                         const u8 *tim_ie;
4269
4270                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4271                         sdata->vif.bss_conf.sync_device_ts =
4272                                 bss->device_ts_beacon;
4273                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4274                                                   ies->data, ies->len);
4275                         if (tim_ie && tim_ie[1] >= 2)
4276                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4277                         else
4278                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4279                 } else if (!(local->hw.flags &
4280                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4281                         ies = rcu_dereference(cbss->proberesp_ies);
4282                         /* must be non-NULL since beacon IEs were NULL */
4283                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4284                         sdata->vif.bss_conf.sync_device_ts =
4285                                 bss->device_ts_presp;
4286                         sdata->vif.bss_conf.sync_dtim_count = 0;
4287                 } else {
4288                         sdata->vif.bss_conf.sync_tsf = 0;
4289                         sdata->vif.bss_conf.sync_device_ts = 0;
4290                         sdata->vif.bss_conf.sync_dtim_count = 0;
4291                 }
4292                 rcu_read_unlock();
4293
4294                 /* tell driver about BSSID, basic rates and timing */
4295                 ieee80211_bss_info_change_notify(sdata,
4296                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4297                         BSS_CHANGED_BEACON_INT);
4298
4299                 if (assoc)
4300                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4301
4302                 err = sta_info_insert(new_sta);
4303                 new_sta = NULL;
4304                 if (err) {
4305                         sdata_info(sdata,
4306                                    "failed to insert STA entry for the AP (error %d)\n",
4307                                    err);
4308                         return err;
4309                 }
4310         } else
4311                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4312
4313         return 0;
4314 }
4315
4316 /* config hooks */
4317 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4318                        struct cfg80211_auth_request *req)
4319 {
4320         struct ieee80211_local *local = sdata->local;
4321         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4322         struct ieee80211_mgd_auth_data *auth_data;
4323         u16 auth_alg;
4324         int err;
4325
4326         /* prepare auth data structure */
4327
4328         switch (req->auth_type) {
4329         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4330                 auth_alg = WLAN_AUTH_OPEN;
4331                 break;
4332         case NL80211_AUTHTYPE_SHARED_KEY:
4333                 if (IS_ERR(local->wep_tx_tfm))
4334                         return -EOPNOTSUPP;
4335                 auth_alg = WLAN_AUTH_SHARED_KEY;
4336                 break;
4337         case NL80211_AUTHTYPE_FT:
4338                 auth_alg = WLAN_AUTH_FT;
4339                 break;
4340         case NL80211_AUTHTYPE_NETWORK_EAP:
4341                 auth_alg = WLAN_AUTH_LEAP;
4342                 break;
4343         case NL80211_AUTHTYPE_SAE:
4344                 auth_alg = WLAN_AUTH_SAE;
4345                 break;
4346         default:
4347                 return -EOPNOTSUPP;
4348         }
4349
4350         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4351                             req->ie_len, GFP_KERNEL);
4352         if (!auth_data)
4353                 return -ENOMEM;
4354
4355         auth_data->bss = req->bss;
4356
4357         if (req->sae_data_len >= 4) {
4358                 __le16 *pos = (__le16 *) req->sae_data;
4359                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4360                 auth_data->sae_status = le16_to_cpu(pos[1]);
4361                 memcpy(auth_data->data, req->sae_data + 4,
4362                        req->sae_data_len - 4);
4363                 auth_data->data_len += req->sae_data_len - 4;
4364         }
4365
4366         if (req->ie && req->ie_len) {
4367                 memcpy(&auth_data->data[auth_data->data_len],
4368                        req->ie, req->ie_len);
4369                 auth_data->data_len += req->ie_len;
4370         }
4371
4372         if (req->key && req->key_len) {
4373                 auth_data->key_len = req->key_len;
4374                 auth_data->key_idx = req->key_idx;
4375                 memcpy(auth_data->key, req->key, req->key_len);
4376         }
4377
4378         auth_data->algorithm = auth_alg;
4379
4380         /* try to authenticate/probe */
4381
4382         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4383             ifmgd->assoc_data) {
4384                 err = -EBUSY;
4385                 goto err_free;
4386         }
4387
4388         if (ifmgd->auth_data)
4389                 ieee80211_destroy_auth_data(sdata, false);
4390
4391         /* prep auth_data so we don't go into idle on disassoc */
4392         ifmgd->auth_data = auth_data;
4393
4394         if (ifmgd->associated) {
4395                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4396
4397                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4398                                        WLAN_REASON_UNSPECIFIED,
4399                                        false, frame_buf);
4400
4401                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4402                                       sizeof(frame_buf));
4403         }
4404
4405         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4406
4407         err = ieee80211_prep_connection(sdata, req->bss, false);
4408         if (err)
4409                 goto err_clear;
4410
4411         err = ieee80211_probe_auth(sdata);
4412         if (err) {
4413                 sta_info_destroy_addr(sdata, req->bss->bssid);
4414                 goto err_clear;
4415         }
4416
4417         /* hold our own reference */
4418         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4419         return 0;
4420
4421  err_clear:
4422         memset(ifmgd->bssid, 0, ETH_ALEN);
4423         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4424         ifmgd->auth_data = NULL;
4425  err_free:
4426         kfree(auth_data);
4427         return err;
4428 }
4429
4430 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4431                                         const u8 *wmm_param, int len)
4432 {
4433         const u8 *pos;
4434         size_t left;
4435
4436         if (len < 8)
4437                 return false;
4438
4439         if (wmm_param[5] != 1 /* version */)
4440                 return false;
4441
4442         pos = wmm_param + 8;
4443         left = len - 8;
4444
4445         for (; left >= 4; left -= 4, pos += 4) {
4446                 u8 aifsn = pos[0] & 0x0f;
4447                 u8 ecwmin = pos[1] & 0x0f;
4448                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4449                 int aci = (pos[0] >> 5) & 0x03;
4450
4451                 if (aifsn < 2) {
4452                         sdata_info(sdata,
4453                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4454                                    aifsn, aci);
4455                         return false;
4456                 }
4457                 if (ecwmin > ecwmax) {
4458                         sdata_info(sdata,
4459                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4460                                    ecwmin, ecwmax, aci);
4461                         return false;
4462                 }
4463         }
4464
4465         return true;
4466 }
4467
4468 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4469                         struct cfg80211_assoc_request *req)
4470 {
4471         struct ieee80211_local *local = sdata->local;
4472         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4473         struct ieee80211_bss *bss = (void *)req->bss->priv;
4474         struct ieee80211_mgd_assoc_data *assoc_data;
4475         const struct cfg80211_bss_ies *beacon_ies;
4476         struct ieee80211_supported_band *sband;
4477         const u8 *ssidie, *ht_ie, *vht_ie;
4478         int i, err;
4479
4480         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4481         if (!assoc_data)
4482                 return -ENOMEM;
4483
4484         rcu_read_lock();
4485         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4486         if (!ssidie) {
4487                 rcu_read_unlock();
4488                 kfree(assoc_data);
4489                 return -EINVAL;
4490         }
4491         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4492         assoc_data->ssid_len = ssidie[1];
4493         rcu_read_unlock();
4494
4495         if (ifmgd->associated) {
4496                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4497
4498                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4499                                        WLAN_REASON_UNSPECIFIED,
4500                                        false, frame_buf);
4501
4502                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4503                                       sizeof(frame_buf));
4504         }
4505
4506         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4507                 err = -EBUSY;
4508                 goto err_free;
4509         }
4510
4511         if (ifmgd->assoc_data) {
4512                 err = -EBUSY;
4513                 goto err_free;
4514         }
4515
4516         if (ifmgd->auth_data) {
4517                 bool match;
4518
4519                 /* keep sta info, bssid if matching */
4520                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4521                 ieee80211_destroy_auth_data(sdata, match);
4522         }
4523
4524         /* prepare assoc data */
4525
4526         ifmgd->beacon_crc_valid = false;
4527
4528         assoc_data->wmm = bss->wmm_used &&
4529                           (local->hw.queues >= IEEE80211_NUM_ACS);
4530         if (assoc_data->wmm) {
4531                 /* try to check validity of WMM params IE */
4532                 const struct cfg80211_bss_ies *ies;
4533                 const u8 *wp, *start, *end;
4534
4535                 rcu_read_lock();
4536                 ies = rcu_dereference(req->bss->ies);
4537                 start = ies->data;
4538                 end = start + ies->len;
4539
4540                 while (true) {
4541                         wp = cfg80211_find_vendor_ie(
4542                                 WLAN_OUI_MICROSOFT,
4543                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4544                                 start, end - start);
4545                         if (!wp)
4546                                 break;
4547                         start = wp + wp[1] + 2;
4548                         /* if this IE is too short, try the next */
4549                         if (wp[1] <= 4)
4550                                 continue;
4551                         /* if this IE is WMM params, we found what we wanted */
4552                         if (wp[6] == 1)
4553                                 break;
4554                 }
4555
4556                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4557                                                         wp[1] - 2)) {
4558                         assoc_data->wmm = false;
4559                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4560                 }
4561                 rcu_read_unlock();
4562         }
4563
4564         /*
4565          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4566          * We still associate in non-HT mode (11a/b/g) if any one of these
4567          * ciphers is configured as pairwise.
4568          * We can set this to true for non-11n hardware, that'll be checked
4569          * separately along with the peer capabilities.
4570          */
4571         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4572                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4573                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4574                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4575                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4576                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4577                         netdev_info(sdata->dev,
4578                                     "disabling HT/VHT due to WEP/TKIP use\n");
4579                 }
4580         }
4581
4582         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4583                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4584                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4585         }
4586
4587         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4588                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4589
4590         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4591         sband = local->hw.wiphy->bands[req->bss->channel->band];
4592         if (!sband->ht_cap.ht_supported ||
4593             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4594             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4595                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4596                 if (!bss->wmm_used &&
4597                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4598                         netdev_info(sdata->dev,
4599                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4600         }
4601
4602         /* disable VHT if we don't support it or the AP doesn't use WMM */
4603         if (!sband->vht_cap.vht_supported ||
4604             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4605             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4606                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4607                 if (!bss->wmm_used &&
4608                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4609                         netdev_info(sdata->dev,
4610                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4611         }
4612
4613         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4614         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4615                sizeof(ifmgd->ht_capa_mask));
4616
4617         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4618         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4619                sizeof(ifmgd->vht_capa_mask));
4620
4621         if (req->ie && req->ie_len) {
4622                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4623                 assoc_data->ie_len = req->ie_len;
4624         }
4625
4626         assoc_data->bss = req->bss;
4627
4628         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4629                 if (ifmgd->powersave)
4630                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4631                 else
4632                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4633         } else
4634                 sdata->smps_mode = ifmgd->req_smps;
4635
4636         assoc_data->capability = req->bss->capability;
4637         assoc_data->supp_rates = bss->supp_rates;
4638         assoc_data->supp_rates_len = bss->supp_rates_len;
4639
4640         rcu_read_lock();
4641         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4642         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4643                 assoc_data->ap_ht_param =
4644                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4645         else
4646                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4647         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4648         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4649                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4650                        sizeof(struct ieee80211_vht_cap));
4651         else
4652                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4653         rcu_read_unlock();
4654
4655         if (bss->wmm_used && bss->uapsd_supported &&
4656             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4657                 assoc_data->uapsd = true;
4658                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4659         } else {
4660                 assoc_data->uapsd = false;
4661                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4662         }
4663
4664         if (req->prev_bssid)
4665                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4666
4667         if (req->use_mfp) {
4668                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4669                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4670         } else {
4671                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4672                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4673         }
4674
4675         if (req->flags & ASSOC_REQ_USE_RRM)
4676                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4677         else
4678                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4679
4680         if (req->crypto.control_port)
4681                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4682         else
4683                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4684
4685         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4686         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4687         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4688                                                         sdata->vif.type);
4689
4690         /* kick off associate process */
4691
4692         ifmgd->assoc_data = assoc_data;
4693         ifmgd->dtim_period = 0;
4694         ifmgd->have_beacon = false;
4695
4696         err = ieee80211_prep_connection(sdata, req->bss, true);
4697         if (err)
4698                 goto err_clear;
4699
4700         rcu_read_lock();
4701         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4702
4703         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4704             !beacon_ies) {
4705                 /*
4706                  * Wait up to one beacon interval ...
4707                  * should this be more if we miss one?
4708                  */
4709                 sdata_info(sdata, "waiting for beacon from %pM\n",
4710                            ifmgd->bssid);
4711                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4712                 assoc_data->timeout_started = true;
4713                 assoc_data->need_beacon = true;
4714         } else if (beacon_ies) {
4715                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4716                                                     beacon_ies->data,
4717                                                     beacon_ies->len);
4718                 u8 dtim_count = 0;
4719
4720                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4721                         const struct ieee80211_tim_ie *tim;
4722                         tim = (void *)(tim_ie + 2);
4723                         ifmgd->dtim_period = tim->dtim_period;
4724                         dtim_count = tim->dtim_count;
4725                 }
4726                 ifmgd->have_beacon = true;
4727                 assoc_data->timeout = jiffies;
4728                 assoc_data->timeout_started = true;
4729
4730                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4731                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4732                         sdata->vif.bss_conf.sync_device_ts =
4733                                 bss->device_ts_beacon;
4734                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4735                 }
4736         } else {
4737                 assoc_data->timeout = jiffies;
4738                 assoc_data->timeout_started = true;
4739         }
4740         rcu_read_unlock();
4741
4742         run_again(sdata, assoc_data->timeout);
4743
4744         if (bss->corrupt_data) {
4745                 char *corrupt_type = "data";
4746                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4747                         if (bss->corrupt_data &
4748                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4749                                 corrupt_type = "beacon and probe response";
4750                         else
4751                                 corrupt_type = "beacon";
4752                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4753                         corrupt_type = "probe response";
4754                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4755                            corrupt_type);
4756         }
4757
4758         return 0;
4759  err_clear:
4760         memset(ifmgd->bssid, 0, ETH_ALEN);
4761         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4762         ifmgd->assoc_data = NULL;
4763  err_free:
4764         kfree(assoc_data);
4765         return err;
4766 }
4767
4768 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4769                          struct cfg80211_deauth_request *req)
4770 {
4771         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4772         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4773         bool tx = !req->local_state_change;
4774
4775         if (ifmgd->auth_data &&
4776             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4777                 sdata_info(sdata,
4778                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4779                            req->bssid, req->reason_code,
4780                            ieee80211_get_reason_code_string(req->reason_code));
4781
4782                 drv_mgd_prepare_tx(sdata->local, sdata);
4783                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4784                                                IEEE80211_STYPE_DEAUTH,
4785                                                req->reason_code, tx,
4786                                                frame_buf);
4787                 ieee80211_destroy_auth_data(sdata, false);
4788                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4789                                       IEEE80211_DEAUTH_FRAME_LEN);
4790
4791                 return 0;
4792         }
4793
4794         if (ifmgd->associated &&
4795             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4796                 sdata_info(sdata,
4797                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4798                            req->bssid, req->reason_code,
4799                            ieee80211_get_reason_code_string(req->reason_code));
4800
4801                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4802                                        req->reason_code, tx, frame_buf);
4803                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4804                                       IEEE80211_DEAUTH_FRAME_LEN);
4805                 return 0;
4806         }
4807
4808         return -ENOTCONN;
4809 }
4810
4811 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4812                            struct cfg80211_disassoc_request *req)
4813 {
4814         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4815         u8 bssid[ETH_ALEN];
4816         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4817
4818         /*
4819          * cfg80211 should catch this ... but it's racy since
4820          * we can receive a disassoc frame, process it, hand it
4821          * to cfg80211 while that's in a locked section already
4822          * trying to tell us that the user wants to disconnect.
4823          */
4824         if (ifmgd->associated != req->bss)
4825                 return -ENOLINK;
4826
4827         sdata_info(sdata,
4828                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4829                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4830
4831         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4832         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4833                                req->reason_code, !req->local_state_change,
4834                                frame_buf);
4835
4836         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4837                               IEEE80211_DEAUTH_FRAME_LEN);
4838
4839         return 0;
4840 }
4841
4842 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4843 {
4844         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4845
4846         /*
4847          * Make sure some work items will not run after this,
4848          * they will not do anything but might not have been
4849          * cancelled when disconnecting.
4850          */
4851         cancel_work_sync(&ifmgd->monitor_work);
4852         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4853         cancel_work_sync(&ifmgd->request_smps_work);
4854         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4855         cancel_work_sync(&ifmgd->chswitch_work);
4856         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4857
4858         sdata_lock(sdata);
4859         if (ifmgd->assoc_data) {
4860                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4861                 ieee80211_destroy_assoc_data(sdata, false);
4862                 cfg80211_assoc_timeout(sdata->dev, bss);
4863         }
4864         if (ifmgd->auth_data)
4865                 ieee80211_destroy_auth_data(sdata, false);
4866         del_timer_sync(&ifmgd->timer);
4867         sdata_unlock(sdata);
4868 }
4869
4870 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4871                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4872                                gfp_t gfp)
4873 {
4874         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4875
4876         trace_api_cqm_rssi_notify(sdata, rssi_event);
4877
4878         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4879 }
4880 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);