net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/pm_qos.h>
  23 #include <linux/crc32.h>
  24 #include <linux/slab.h>
  25 #include <linux/export.h>
  26 #include <net/mac80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_i.h"
  30 #include "driver-ops.h"
  31 #include "rate.h"
  32 #include "led.h"
  33
  34 #define IEEE80211_AUTH_TIMEOUT          (HZ / 5)
  35 #define IEEE80211_AUTH_TIMEOUT_LONG     (HZ / 2)
  36 #define IEEE80211_AUTH_TIMEOUT_SHORT    (HZ / 10)
  37 #define IEEE80211_AUTH_MAX_TRIES        3
  38 #define IEEE80211_AUTH_WAIT_ASSOC       (HZ * 5)
  39 #define IEEE80211_ASSOC_TIMEOUT         (HZ / 5)
  40 #define IEEE80211_ASSOC_TIMEOUT_LONG    (HZ / 2)
  41 #define IEEE80211_ASSOC_TIMEOUT_SHORT   (HZ / 10)
  42 #define IEEE80211_ASSOC_MAX_TRIES       3
  43
  44 static int max_nullfunc_tries = 2;
  45 module_param(max_nullfunc_tries, int, 0644);
  46 MODULE_PARM_DESC(max_nullfunc_tries,
  47                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  48
  49 static int max_probe_tries = 5;
  50 module_param(max_probe_tries, int, 0644);
  51 MODULE_PARM_DESC(max_probe_tries,
  52                  "Maximum probe tries before disconnecting (reason 4).");
  53
  54 /*
  55  * Beacon loss timeout is calculated as N frames times the
  56  * advertised beacon interval.  This may need to be somewhat
  57  * higher than what hardware might detect to account for
  58  * delays in the host processing frames. But since we also
  59  * probe on beacon miss before declaring the connection lost
  60  * default to what we want.
  61  */
  62 static int beacon_loss_count = 7;
  63 module_param(beacon_loss_count, int, 0644);
  64 MODULE_PARM_DESC(beacon_loss_count,
  65                  "Number of beacon intervals before we decide beacon was lost.");
  66
  67 /*
  68  * Time the connection can be idle before we probe
  69  * it to see if we can still talk to the AP.
  70  */
  71 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  72 /*
  73  * Time we wait for a probe response after sending
  74  * a probe request because of beacon loss or for
  75  * checking the connection still works.
  76  */
  77 static int probe_wait_ms = 500;
  78 module_param(probe_wait_ms, int, 0644);
  79 MODULE_PARM_DESC(probe_wait_ms,
  80                  "Maximum time(ms) to wait for probe response"
  81                  " before disconnecting (reason 4).");
  82
  83 /*
  84  * Weight given to the latest Beacon frame when calculating average signal
  85  * strength for Beacon frames received in the current BSS. This must be
  86  * between 1 and 15.
  87  */
  88 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  89
  90 /*
  91  * How many Beacon frames need to have been used in average signal strength
  92  * before starting to indicate signal change events.
  93  */
  94 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  95
  96 /*
  97  * We can have multiple work items (and connection probing)
  98  * scheduling this timer, but we need to take care to only
  99  * reschedule it when it should fire _earlier_ than it was
 100  * asked for before, or if it's not pending right now. This
 101  * function ensures that. Note that it then is required to
 102  * run this function for all timeouts after the first one
 103  * has happened -- the work that runs from this timer will
 104  * do that.
 105  */
 106 static void run_again(struct ieee80211_sub_if_data *sdata,
 107                       unsigned long timeout)
 108 {
 109         sdata_assert_lock(sdata);
 110
 111         if (!timer_pending(&sdata->u.mgd.timer) ||
 112             time_before(timeout, sdata->u.mgd.timer.expires))
 113                 mod_timer(&sdata->u.mgd.timer, timeout);
 114 }
 115
 116 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 117 {
 118         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 119                 return;
 120
 121         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 122                 return;
 123
 124         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 125                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 126 }
 127
 128 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 129 {
 130         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 131
 132         if (unlikely(!sdata->u.mgd.associated))
 133                 return;
 134
 135         ifmgd->probe_send_count = 0;
 136
 137         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 138                 return;
 139
 140         mod_timer(&sdata->u.mgd.conn_mon_timer,
 141                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 142 }
 143
 144 static int ecw2cw(int ecw)
 145 {
 146         return (1 << ecw) - 1;
 147 }
 148
 149 static u32
 150 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 151                              struct ieee80211_supported_band *sband,
 152                              struct ieee80211_channel *channel,
 153                              const struct ieee80211_ht_cap *ht_cap,
 154                              const struct ieee80211_ht_operation *ht_oper,
 155                              const struct ieee80211_vht_operation *vht_oper,
 156                              struct cfg80211_chan_def *chandef, bool tracking)
 157 {
 158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 159         struct cfg80211_chan_def vht_chandef;
 160         u32 ht_cfreq, ret;
 161
 162         chandef->chan = channel;
 163         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 164         chandef->center_freq1 = channel->center_freq;
 165         chandef->center_freq2 = 0;
 166
 167         if (!ht_cap || !ht_oper || !sband->ht_cap.ht_supported) {
 168                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 169                 goto out;
 170         }
 171
 172         chandef->width = NL80211_CHAN_WIDTH_20;
 173
 174         if (!(ht_cap->cap_info &
 175               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 176                 ret = IEEE80211_STA_DISABLE_40MHZ;
 177                 goto out;
 178         }
 179
 180         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 181                                                   channel->band);
 182         /* check that channel matches the right operating channel */
 183         if (!tracking && channel->center_freq != ht_cfreq) {
 184                 /*
 185                  * It's possible that some APs are confused here;
 186                  * Netgear WNDR3700 sometimes reports 4 higher than
 187                  * the actual channel in association responses, but
 188                  * since we look at probe response/beacon data here
 189                  * it should be OK.
 190                  */
 191                 sdata_info(sdata,
 192                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 193                            channel->center_freq, ht_cfreq,
 194                            ht_oper->primary_chan, channel->band);
 195                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 196                 goto out;
 197         }
 198
 199         /* check 40 MHz support, if we have it */
 200         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 201                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 202                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 203                         chandef->width = NL80211_CHAN_WIDTH_40;
 204                         chandef->center_freq1 += 10;
 205                         break;
 206                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 207                         chandef->width = NL80211_CHAN_WIDTH_40;
 208                         chandef->center_freq1 -= 10;
 209                         break;
 210                 }
 211         } else {
 212                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 213                 ret = IEEE80211_STA_DISABLE_VHT;
 214                 /* also mark 40 MHz disabled */
 215                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 216                 goto out;
 217         }
 218
 219         if (!vht_oper || !sband->vht_cap.vht_supported) {
 220                 ret = IEEE80211_STA_DISABLE_VHT;
 221                 goto out;
 222         }
 223
 224         vht_chandef.chan = channel;
 225         vht_chandef.center_freq1 =
 226                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 227                                                channel->band);
 228         vht_chandef.center_freq2 = 0;
 229
 230         switch (vht_oper->chan_width) {
 231         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 232                 vht_chandef.width = chandef->width;
 233                 vht_chandef.center_freq1 = chandef->center_freq1;
 234                 break;
 235         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 236                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 237                 break;
 238         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 239                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 240                 break;
 241         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 242                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 243                 vht_chandef.center_freq2 =
 244                         ieee80211_channel_to_frequency(
 245                                 vht_oper->center_freq_seg2_idx,
 246                                 channel->band);
 247                 break;
 248         default:
 249                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 250                         sdata_info(sdata,
 251                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 252                                    vht_oper->chan_width);
 253                 ret = IEEE80211_STA_DISABLE_VHT;
 254                 goto out;
 255         }
 256
 257         if (!cfg80211_chandef_valid(&vht_chandef)) {
 258                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 259                         sdata_info(sdata,
 260                                    "AP VHT information is invalid, disable VHT\n");
 261                 ret = IEEE80211_STA_DISABLE_VHT;
 262                 goto out;
 263         }
 264
 265         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 266                 ret = 0;
 267                 goto out;
 268         }
 269
 270         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 271                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 272                         sdata_info(sdata,
 273                                    "AP VHT information doesn't match HT, disable VHT\n");
 274                 ret = IEEE80211_STA_DISABLE_VHT;
 275                 goto out;
 276         }
 277
 278         *chandef = vht_chandef;
 279
 280         ret = 0;
 281
 282 out:
 283         /*
 284          * When tracking the current AP, don't do any further checks if the
 285          * new chandef is identical to the one we're currently using for the
 286          * connection. This keeps us from playing ping-pong with regulatory,
 287          * without it the following can happen (for example):
 288          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 289          *  - AP advertises regdom US
 290          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 291          *  - the code below detects an unsupported channel, downgrades, and
 292          *    we disconnect from the AP in the caller
 293          *  - disconnect causes CRDA to reload world regdomain and the game
 294          *    starts anew.
 295          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 296          *
 297          * It seems possible that there are still scenarios with CSA or real
 298          * bandwidth changes where a this could happen, but those cases are
 299          * less common and wouldn't completely prevent using the AP.
 300          */
 301         if (tracking &&
 302             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 303                 return ret;
 304
 305         /* don't print the message below for VHT mismatch if VHT is disabled */
 306         if (ret & IEEE80211_STA_DISABLE_VHT)
 307                 vht_chandef = *chandef;
 308
 309         /*
 310          * Ignore the DISABLED flag when we're already connected and only
 311          * tracking the APs beacon for bandwidth changes - otherwise we
 312          * might get disconnected here if we connect to an AP, update our
 313          * regulatory information based on the AP's country IE and the
 314          * information we have is wrong/outdated and disables the channel
 315          * that we're actually using for the connection to the AP.
 316          */
 317         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 318                                         tracking ? 0 :
 319                                                    IEEE80211_CHAN_DISABLED)) {
 320                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 321                         ret = IEEE80211_STA_DISABLE_HT |
 322                               IEEE80211_STA_DISABLE_VHT;
 323                         break;
 324                 }
 325
 326                 ret |= ieee80211_chandef_downgrade(chandef);
 327         }
 328
 329         if (chandef->width != vht_chandef.width && !tracking)
 330                 sdata_info(sdata,
 331                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 332
 333         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 334         return ret;
 335 }
 336
 337 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 338                                struct sta_info *sta,
 339                                const struct ieee80211_ht_cap *ht_cap,
 340                                const struct ieee80211_ht_operation *ht_oper,
 341                                const struct ieee80211_vht_operation *vht_oper,
 342                                const u8 *bssid, u32 *changed)
 343 {
 344         struct ieee80211_local *local = sdata->local;
 345         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 346         struct ieee80211_supported_band *sband;
 347         struct ieee80211_channel *chan;
 348         struct cfg80211_chan_def chandef;
 349         u16 ht_opmode;
 350         u32 flags;
 351         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 352         int ret;
 353
 354         /* if HT was/is disabled, don't track any bandwidth changes */
 355         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 356                 return 0;
 357
 358         /* don't check VHT if we associated as non-VHT station */
 359         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 360                 vht_oper = NULL;
 361
 362         if (WARN_ON_ONCE(!sta))
 363                 return -EINVAL;
 364
 365         /*
 366          * if bss configuration changed store the new one -
 367          * this may be applicable even if channel is identical
 368          */
 369         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 370         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 371                 *changed |= BSS_CHANGED_HT;
 372                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 373         }
 374
 375         chan = sdata->vif.bss_conf.chandef.chan;
 376         sband = local->hw.wiphy->bands[chan->band];
 377
 378         /* calculate new channel (type) based on HT/VHT operation IEs */
 379         flags = ieee80211_determine_chantype(sdata, sband, chan,
 380                                              ht_cap, ht_oper, vht_oper,
 381                                              &chandef, true);
 382
 383         /*
 384          * Downgrade the new channel if we associated with restricted
 385          * capabilities. For example, if we associated as a 20 MHz STA
 386          * to a 40 MHz AP (due to regulatory, capabilities or config
 387          * reasons) then switching to a 40 MHz channel now won't do us
 388          * any good -- we couldn't use it with the AP.
 389          */
 390         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 391             chandef.width == NL80211_CHAN_WIDTH_80P80)
 392                 flags |= ieee80211_chandef_downgrade(&chandef);
 393         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 394             chandef.width == NL80211_CHAN_WIDTH_160)
 395                 flags |= ieee80211_chandef_downgrade(&chandef);
 396         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 397             chandef.width > NL80211_CHAN_WIDTH_20)
 398                 flags |= ieee80211_chandef_downgrade(&chandef);
 399
 400         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 401                 return 0;
 402
 403         sdata_info(sdata,
 404                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 405                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 406                    chandef.center_freq1, chandef.center_freq2);
 407
 408         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 409                                       IEEE80211_STA_DISABLE_VHT |
 410                                       IEEE80211_STA_DISABLE_40MHZ |
 411                                       IEEE80211_STA_DISABLE_80P80MHZ |
 412                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 413             !cfg80211_chandef_valid(&chandef)) {
 414                 sdata_info(sdata,
 415                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 416                            ifmgd->bssid);
 417                 return -EINVAL;
 418         }
 419
 420         switch (chandef.width) {
 421         case NL80211_CHAN_WIDTH_20_NOHT:
 422         case NL80211_CHAN_WIDTH_20:
 423                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 424                 break;
 425         case NL80211_CHAN_WIDTH_40:
 426                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 427                 break;
 428         case NL80211_CHAN_WIDTH_80:
 429                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 430                 break;
 431         case NL80211_CHAN_WIDTH_80P80:
 432         case NL80211_CHAN_WIDTH_160:
 433                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 434                 break;
 435         default:
 436                 return -EINVAL;
 437         }
 438
 439         if (new_sta_bw > sta->cur_max_bandwidth)
 440                 new_sta_bw = sta->cur_max_bandwidth;
 441
 442         if (new_sta_bw < sta->sta.bandwidth) {
 443                 sta->sta.bandwidth = new_sta_bw;
 444                 rate_control_rate_update(local, sband, sta,
 445                                          IEEE80211_RC_BW_CHANGED);
 446         }
 447
 448         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 449         if (ret) {
 450                 sdata_info(sdata,
 451                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 452                            ifmgd->bssid);
 453                 return ret;
 454         }
 455
 456         if (new_sta_bw > sta->sta.bandwidth) {
 457                 sta->sta.bandwidth = new_sta_bw;
 458                 rate_control_rate_update(local, sband, sta,
 459                                          IEEE80211_RC_BW_CHANGED);
 460         }
 461
 462         return 0;
 463 }
 464
 465 /* frame sending functions */
 466
 467 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 468                                 struct sk_buff *skb, u8 ap_ht_param,
 469                                 struct ieee80211_supported_band *sband,
 470                                 struct ieee80211_channel *channel,
 471                                 enum ieee80211_smps_mode smps)
 472 {
 473         u8 *pos;
 474         u32 flags = channel->flags;
 475         u16 cap;
 476         struct ieee80211_sta_ht_cap ht_cap;
 477
 478         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 479
 480         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 481         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 482
 483         /* determine capability flags */
 484         cap = ht_cap.cap;
 485
 486         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 487         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 488                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 489                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 490                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 491                 }
 492                 break;
 493         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 494                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 495                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 496                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 497                 }
 498                 break;
 499         }
 500
 501         /*
 502          * If 40 MHz was disabled associate as though we weren't
 503          * capable of 40 MHz -- some broken APs will never fall
 504          * back to trying to transmit in 20 MHz.
 505          */
 506         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 507                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 508                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 509         }
 510
 511         /* set SM PS mode properly */
 512         cap &= ~IEEE80211_HT_CAP_SM_PS;
 513         switch (smps) {
 514         case IEEE80211_SMPS_AUTOMATIC:
 515         case IEEE80211_SMPS_NUM_MODES:
 516                 WARN_ON(1);
 517         case IEEE80211_SMPS_OFF:
 518                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 519                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 520                 break;
 521         case IEEE80211_SMPS_STATIC:
 522                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 523                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 524                 break;
 525         case IEEE80211_SMPS_DYNAMIC:
 526                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 527                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 528                 break;
 529         }
 530
 531         /* reserve and fill IE */
 532         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 533         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 534 }
 535
 536 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 537                                  struct sk_buff *skb,
 538                                  struct ieee80211_supported_band *sband,
 539                                  struct ieee80211_vht_cap *ap_vht_cap)
 540 {
 541         u8 *pos;
 542         u32 cap;
 543         struct ieee80211_sta_vht_cap vht_cap;
 544         u32 mask, ap_bf_sts, our_bf_sts;
 545
 546         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 547
 548         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 549         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 550
 551         /* determine capability flags */
 552         cap = vht_cap.cap;
 553
 554         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 555                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 556                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 557         }
 558
 559         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 560                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 561                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 562         }
 563
 564         /*
 565          * Some APs apparently get confused if our capabilities are better
 566          * than theirs, so restrict what we advertise in the assoc request.
 567          */
 568         if (!(ap_vht_cap->vht_cap_info &
 569                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 570                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 571
 572         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 573
 574         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 575         our_bf_sts = cap & mask;
 576
 577         if (ap_bf_sts < our_bf_sts) {
 578                 cap &= ~mask;
 579                 cap |= ap_bf_sts;
 580         }
 581
 582         /* reserve and fill IE */
 583         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 584         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 585 }
 586
 587 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 588 {
 589         struct ieee80211_local *local = sdata->local;
 590         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 591         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 592         struct sk_buff *skb;
 593         struct ieee80211_mgmt *mgmt;
 594         u8 *pos, qos_info;
 595         size_t offset = 0, noffset;
 596         int i, count, rates_len, supp_rates_len, shift;
 597         u16 capab;
 598         struct ieee80211_supported_band *sband;
 599         struct ieee80211_chanctx_conf *chanctx_conf;
 600         struct ieee80211_channel *chan;
 601         u32 rate_flags, rates = 0;
 602
 603         sdata_assert_lock(sdata);
 604
 605         rcu_read_lock();
 606         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 607         if (WARN_ON(!chanctx_conf)) {
 608                 rcu_read_unlock();
 609                 return;
 610         }
 611         chan = chanctx_conf->def.chan;
 612         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 613         rcu_read_unlock();
 614         sband = local->hw.wiphy->bands[chan->band];
 615         shift = ieee80211_vif_get_shift(&sdata->vif);
 616
 617         if (assoc_data->supp_rates_len) {
 618                 /*
 619                  * Get all rates supported by the device and the AP as
 620                  * some APs don't like getting a superset of their rates
 621                  * in the association request (e.g. D-Link DAP 1353 in
 622                  * b-only mode)...
 623                  */
 624                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 625                                                      assoc_data->supp_rates,
 626                                                      assoc_data->supp_rates_len,
 627                                                      &rates);
 628         } else {
 629                 /*
 630                  * In case AP not provide any supported rates information
 631                  * before association, we send information element(s) with
 632                  * all rates that we support.
 633                  */
 634                 rates_len = 0;
 635                 for (i = 0; i < sband->n_bitrates; i++) {
 636                         if ((rate_flags & sband->bitrates[i].flags)
 637                             != rate_flags)
 638                                 continue;
 639                         rates |= BIT(i);
 640                         rates_len++;
 641                 }
 642         }
 643
 644         skb = alloc_skb(local->hw.extra_tx_headroom +
 645                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 646                         2 + assoc_data->ssid_len + /* SSID */
 647                         4 + rates_len + /* (extended) rates */
 648                         4 + /* power capability */
 649                         2 + 2 * sband->n_channels + /* supported channels */
 650                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 651                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 652                         assoc_data->ie_len + /* extra IEs */
 653                         9, /* WMM */
 654                         GFP_KERNEL);
 655         if (!skb)
 656                 return;
 657
 658         skb_reserve(skb, local->hw.extra_tx_headroom);
 659
 660         capab = WLAN_CAPABILITY_ESS;
 661
 662         if (sband->band == IEEE80211_BAND_2GHZ) {
 663                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 664                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 665                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 666                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 667         }
 668
 669         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 670                 capab |= WLAN_CAPABILITY_PRIVACY;
 671
 672         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 673             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 674                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 675
 676         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 677                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 678
 679         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 680         memset(mgmt, 0, 24);
 681         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 682         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 683         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 684
 685         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 686                 skb_put(skb, 10);
 687                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 688                                                   IEEE80211_STYPE_REASSOC_REQ);
 689                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 690                 mgmt->u.reassoc_req.listen_interval =
 691                                 cpu_to_le16(local->hw.conf.listen_interval);
 692                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 693                        ETH_ALEN);
 694         } else {
 695                 skb_put(skb, 4);
 696                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 697                                                   IEEE80211_STYPE_ASSOC_REQ);
 698                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 699                 mgmt->u.assoc_req.listen_interval =
 700                                 cpu_to_le16(local->hw.conf.listen_interval);
 701         }
 702
 703         /* SSID */
 704         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 705         *pos++ = WLAN_EID_SSID;
 706         *pos++ = assoc_data->ssid_len;
 707         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 708
 709         /* add all rates which were marked to be used above */
 710         supp_rates_len = rates_len;
 711         if (supp_rates_len > 8)
 712                 supp_rates_len = 8;
 713
 714         pos = skb_put(skb, supp_rates_len + 2);
 715         *pos++ = WLAN_EID_SUPP_RATES;
 716         *pos++ = supp_rates_len;
 717
 718         count = 0;
 719         for (i = 0; i < sband->n_bitrates; i++) {
 720                 if (BIT(i) & rates) {
 721                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 722                                                 5 * (1 << shift));
 723                         *pos++ = (u8) rate;
 724                         if (++count == 8)
 725                                 break;
 726                 }
 727         }
 728
 729         if (rates_len > count) {
 730                 pos = skb_put(skb, rates_len - count + 2);
 731                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 732                 *pos++ = rates_len - count;
 733
 734                 for (i++; i < sband->n_bitrates; i++) {
 735                         if (BIT(i) & rates) {
 736                                 int rate;
 737                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 738                                                     5 * (1 << shift));
 739                                 *pos++ = (u8) rate;
 740                         }
 741                 }
 742         }
 743
 744         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 745             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 746                 pos = skb_put(skb, 4);
 747                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 748                 *pos++ = 2;
 749                 *pos++ = 0; /* min tx power */
 750                  /* max tx power */
 751                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 752         }
 753
 754         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 755                 /* TODO: get this in reg domain format */
 756                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 757                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 758                 *pos++ = 2 * sband->n_channels;
 759                 for (i = 0; i < sband->n_channels; i++) {
 760                         *pos++ = ieee80211_frequency_to_channel(
 761                                         sband->channels[i].center_freq);
 762                         *pos++ = 1; /* one channel in the subband*/
 763                 }
 764         }
 765
 766         /* if present, add any custom IEs that go before HT */
 767         if (assoc_data->ie_len) {
 768                 static const u8 before_ht[] = {
 769                         WLAN_EID_SSID,
 770                         WLAN_EID_SUPP_RATES,
 771                         WLAN_EID_EXT_SUPP_RATES,
 772                         WLAN_EID_PWR_CAPABILITY,
 773                         WLAN_EID_SUPPORTED_CHANNELS,
 774                         WLAN_EID_RSN,
 775                         WLAN_EID_QOS_CAPA,
 776                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 777                         WLAN_EID_MOBILITY_DOMAIN,
 778                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 779                 };
 780                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 781                                              before_ht, ARRAY_SIZE(before_ht),
 782                                              offset);
 783                 pos = skb_put(skb, noffset - offset);
 784                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 785                 offset = noffset;
 786         }
 787
 788         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 789                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 790                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 791
 792         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 793                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 794                                     sband, chan, sdata->smps_mode);
 795
 796         /* if present, add any custom IEs that go before VHT */
 797         if (assoc_data->ie_len) {
 798                 static const u8 before_vht[] = {
 799                         WLAN_EID_SSID,
 800                         WLAN_EID_SUPP_RATES,
 801                         WLAN_EID_EXT_SUPP_RATES,
 802                         WLAN_EID_PWR_CAPABILITY,
 803                         WLAN_EID_SUPPORTED_CHANNELS,
 804                         WLAN_EID_RSN,
 805                         WLAN_EID_QOS_CAPA,
 806                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 807                         WLAN_EID_MOBILITY_DOMAIN,
 808                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 809                         WLAN_EID_HT_CAPABILITY,
 810                         WLAN_EID_BSS_COEX_2040,
 811                         WLAN_EID_EXT_CAPABILITY,
 812                         WLAN_EID_QOS_TRAFFIC_CAPA,
 813                         WLAN_EID_TIM_BCAST_REQ,
 814                         WLAN_EID_INTERWORKING,
 815                 };
 816                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 817                                              before_vht, ARRAY_SIZE(before_vht),
 818                                              offset);
 819                 pos = skb_put(skb, noffset - offset);
 820                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 821                 offset = noffset;
 822         }
 823
 824         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 825                 ieee80211_add_vht_ie(sdata, skb, sband,
 826                                      &assoc_data->ap_vht_cap);
 827
 828         /* if present, add any custom non-vendor IEs that go after HT */
 829         if (assoc_data->ie_len) {
 830                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 831                                                     assoc_data->ie_len,
 832                                                     offset);
 833                 pos = skb_put(skb, noffset - offset);
 834                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 835                 offset = noffset;
 836         }
 837
 838         if (assoc_data->wmm) {
 839                 if (assoc_data->uapsd) {
 840                         qos_info = ifmgd->uapsd_queues;
 841                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 842                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 843                 } else {
 844                         qos_info = 0;
 845                 }
 846
 847                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 848         }
 849
 850         /* add any remaining custom (i.e. vendor specific here) IEs */
 851         if (assoc_data->ie_len) {
 852                 noffset = assoc_data->ie_len;
 853                 pos = skb_put(skb, noffset - offset);
 854                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 855         }
 856
 857         drv_mgd_prepare_tx(local, sdata);
 858
 859         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 860         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 861                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 862                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 863         ieee80211_tx_skb(sdata, skb);
 864 }
 865
 866 void ieee80211_send_pspoll(struct ieee80211_local *local,
 867                            struct ieee80211_sub_if_data *sdata)
 868 {
 869         struct ieee80211_pspoll *pspoll;
 870         struct sk_buff *skb;
 871
 872         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 873         if (!skb)
 874                 return;
 875
 876         pspoll = (struct ieee80211_pspoll *) skb->data;
 877         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 878
 879         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 880         ieee80211_tx_skb(sdata, skb);
 881 }
 882
 883 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 884                              struct ieee80211_sub_if_data *sdata,
 885                              int powersave)
 886 {
 887         struct sk_buff *skb;
 888         struct ieee80211_hdr_3addr *nullfunc;
 889         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 890
 891         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 892         if (!skb)
 893                 return;
 894
 895         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 896         if (powersave)
 897                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 898
 899         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 900                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 901
 902         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 903                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 904
 905         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 906                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 907
 908         ieee80211_tx_skb(sdata, skb);
 909 }
 910
 911 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 912                                           struct ieee80211_sub_if_data *sdata)
 913 {
 914         struct sk_buff *skb;
 915         struct ieee80211_hdr *nullfunc;
 916         __le16 fc;
 917
 918         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 919                 return;
 920
 921         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 922         if (!skb)
 923                 return;
 924
 925         skb_reserve(skb, local->hw.extra_tx_headroom);
 926
 927         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 928         memset(nullfunc, 0, 30);
 929         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 930                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 931         nullfunc->frame_control = fc;
 932         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 933         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 934         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 935         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 936
 937         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 938         ieee80211_tx_skb(sdata, skb);
 939 }
 940
 941 /* spectrum management related things */
 942 static void ieee80211_chswitch_work(struct work_struct *work)
 943 {
 944         struct ieee80211_sub_if_data *sdata =
 945                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 946         struct ieee80211_local *local = sdata->local;
 947         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 948         int ret;
 949
 950         if (!ieee80211_sdata_running(sdata))
 951                 return;
 952
 953         sdata_lock(sdata);
 954         mutex_lock(&local->mtx);
 955         mutex_lock(&local->chanctx_mtx);
 956
 957         if (!ifmgd->associated)
 958                 goto out;
 959
 960         if (!sdata->vif.csa_active)
 961                 goto out;
 962
 963         /*
 964          * using reservation isn't immediate as it may be deferred until later
 965          * with multi-vif. once reservation is complete it will re-schedule the
 966          * work with no reserved_chanctx so verify chandef to check if it
 967          * completed successfully
 968          */
 969
 970         if (sdata->reserved_chanctx) {
 971                 /*
 972                  * with multi-vif csa driver may call ieee80211_csa_finish()
 973                  * many times while waiting for other interfaces to use their
 974                  * reservations
 975                  */
 976                 if (sdata->reserved_ready)
 977                         goto out;
 978
 979                 ret = ieee80211_vif_use_reserved_context(sdata);
 980                 if (ret) {
 981                         sdata_info(sdata,
 982                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
 983                                    ret);
 984                         ieee80211_queue_work(&sdata->local->hw,
 985                                              &ifmgd->csa_connection_drop_work);
 986                         goto out;
 987                 }
 988
 989                 goto out;
 990         }
 991
 992         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
 993                                         &sdata->csa_chandef)) {
 994                 sdata_info(sdata,
 995                            "failed to finalize channel switch, disconnecting\n");
 996                 ieee80211_queue_work(&sdata->local->hw,
 997                                      &ifmgd->csa_connection_drop_work);
 998                 goto out;
 999         }
1000
1001         /* XXX: shouldn't really modify cfg80211-owned data! */
1002         ifmgd->associated->channel = sdata->csa_chandef.chan;
1003
1004         sdata->vif.csa_active = false;
1005
1006         /* XXX: wait for a beacon first? */
1007         if (sdata->csa_block_tx) {
1008                 ieee80211_wake_vif_queues(local, sdata,
1009                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1010                 sdata->csa_block_tx = false;
1011         }
1012
1013         ieee80211_sta_reset_beacon_monitor(sdata);
1014         ieee80211_sta_reset_conn_monitor(sdata);
1015
1016 out:
1017         mutex_unlock(&local->chanctx_mtx);
1018         mutex_unlock(&local->mtx);
1019         sdata_unlock(sdata);
1020 }
1021
1022 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1023 {
1024         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1025         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1026
1027         trace_api_chswitch_done(sdata, success);
1028         if (!success) {
1029                 sdata_info(sdata,
1030                            "driver channel switch failed, disconnecting\n");
1031                 ieee80211_queue_work(&sdata->local->hw,
1032                                      &ifmgd->csa_connection_drop_work);
1033         } else {
1034                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1035         }
1036 }
1037 EXPORT_SYMBOL(ieee80211_chswitch_done);
1038
1039 static void ieee80211_chswitch_timer(unsigned long data)
1040 {
1041         struct ieee80211_sub_if_data *sdata =
1042                 (struct ieee80211_sub_if_data *) data;
1043
1044         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1045 }
1046
1047 static void
1048 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1049                                  u64 timestamp, struct ieee802_11_elems *elems,
1050                                  bool beacon)
1051 {
1052         struct ieee80211_local *local = sdata->local;
1053         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1054         struct cfg80211_bss *cbss = ifmgd->associated;
1055         struct ieee80211_chanctx_conf *conf;
1056         struct ieee80211_chanctx *chanctx;
1057         enum ieee80211_band current_band;
1058         struct ieee80211_csa_ie csa_ie;
1059         int res;
1060
1061         sdata_assert_lock(sdata);
1062
1063         if (!cbss)
1064                 return;
1065
1066         if (local->scanning)
1067                 return;
1068
1069         /* disregard subsequent announcements if we are already processing */
1070         if (sdata->vif.csa_active)
1071                 return;
1072
1073         current_band = cbss->channel->band;
1074         memset(&csa_ie, 0, sizeof(csa_ie));
1075         res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
1076                                            ifmgd->flags,
1077                                            ifmgd->associated->bssid, &csa_ie);
1078         if (res < 0)
1079                 ieee80211_queue_work(&local->hw,
1080                                      &ifmgd->csa_connection_drop_work);
1081         if (res)
1082                 return;
1083
1084         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1085                                      IEEE80211_CHAN_DISABLED)) {
1086                 sdata_info(sdata,
1087                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1088                            ifmgd->associated->bssid,
1089                            csa_ie.chandef.chan->center_freq,
1090                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1091                            csa_ie.chandef.center_freq2);
1092                 ieee80211_queue_work(&local->hw,
1093                                      &ifmgd->csa_connection_drop_work);
1094                 return;
1095         }
1096
1097         mutex_lock(&local->mtx);
1098         mutex_lock(&local->chanctx_mtx);
1099         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1100                                          lockdep_is_held(&local->chanctx_mtx));
1101         if (!conf) {
1102                 sdata_info(sdata,
1103                            "no channel context assigned to vif?, disconnecting\n");
1104                 ieee80211_queue_work(&local->hw,
1105                                      &ifmgd->csa_connection_drop_work);
1106                 mutex_unlock(&local->chanctx_mtx);
1107                 mutex_unlock(&local->mtx);
1108                 return;
1109         }
1110
1111         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1112
1113         if (local->use_chanctx) {
1114                 u32 num_chanctx = 0;
1115                 list_for_each_entry(chanctx, &local->chanctx_list, list)
1116                        num_chanctx++;
1117
1118                 if (num_chanctx > 1 ||
1119                     !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1120                         sdata_info(sdata,
1121                                    "not handling chan-switch with channel contexts\n");
1122                         ieee80211_queue_work(&local->hw,
1123                                              &ifmgd->csa_connection_drop_work);
1124                         mutex_unlock(&local->chanctx_mtx);
1125                         mutex_unlock(&local->mtx);
1126                         return;
1127                 }
1128         }
1129
1130         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1131                                             chanctx->mode, false);
1132         if (res) {
1133                 sdata_info(sdata,
1134                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1135                            res);
1136                 ieee80211_queue_work(&local->hw,
1137                                      &ifmgd->csa_connection_drop_work);
1138                 mutex_unlock(&local->chanctx_mtx);
1139                 mutex_unlock(&local->mtx);
1140                 return;
1141         }
1142         mutex_unlock(&local->chanctx_mtx);
1143
1144         sdata->vif.csa_active = true;
1145         sdata->csa_chandef = csa_ie.chandef;
1146         sdata->csa_block_tx = csa_ie.mode;
1147
1148         if (sdata->csa_block_tx)
1149                 ieee80211_stop_vif_queues(local, sdata,
1150                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1151         mutex_unlock(&local->mtx);
1152
1153         if (local->ops->channel_switch) {
1154                 /* use driver's channel switch callback */
1155                 struct ieee80211_channel_switch ch_switch = {
1156                         .timestamp = timestamp,
1157                         .block_tx = csa_ie.mode,
1158                         .chandef = csa_ie.chandef,
1159                         .count = csa_ie.count,
1160                 };
1161
1162                 drv_channel_switch(local, &ch_switch);
1163                 return;
1164         }
1165
1166         /* channel switch handled in software */
1167         if (csa_ie.count <= 1)
1168                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1169         else
1170                 mod_timer(&ifmgd->chswitch_timer,
1171                           TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1172 }
1173
1174 static bool
1175 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1176                                  struct ieee80211_channel *channel,
1177                                  const u8 *country_ie, u8 country_ie_len,
1178                                  const u8 *pwr_constr_elem,
1179                                  int *chan_pwr, int *pwr_reduction)
1180 {
1181         struct ieee80211_country_ie_triplet *triplet;
1182         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1183         int i, chan_increment;
1184         bool have_chan_pwr = false;
1185
1186         /* Invalid IE */
1187         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1188                 return false;
1189
1190         triplet = (void *)(country_ie + 3);
1191         country_ie_len -= 3;
1192
1193         switch (channel->band) {
1194         default:
1195                 WARN_ON_ONCE(1);
1196                 /* fall through */
1197         case IEEE80211_BAND_2GHZ:
1198         case IEEE80211_BAND_60GHZ:
1199                 chan_increment = 1;
1200                 break;
1201         case IEEE80211_BAND_5GHZ:
1202                 chan_increment = 4;
1203                 break;
1204         }
1205
1206         /* find channel */
1207         while (country_ie_len >= 3) {
1208                 u8 first_channel = triplet->chans.first_channel;
1209
1210                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1211                         goto next;
1212
1213                 for (i = 0; i < triplet->chans.num_channels; i++) {
1214                         if (first_channel + i * chan_increment == chan) {
1215                                 have_chan_pwr = true;
1216                                 *chan_pwr = triplet->chans.max_power;
1217                                 break;
1218                         }
1219                 }
1220                 if (have_chan_pwr)
1221                         break;
1222
1223  next:
1224                 triplet++;
1225                 country_ie_len -= 3;
1226         }
1227
1228         if (have_chan_pwr)
1229                 *pwr_reduction = *pwr_constr_elem;
1230         return have_chan_pwr;
1231 }
1232
1233 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1234                                       struct ieee80211_channel *channel,
1235                                       const u8 *cisco_dtpc_ie,
1236                                       int *pwr_level)
1237 {
1238         /* From practical testing, the first data byte of the DTPC element
1239          * seems to contain the requested dBm level, and the CLI on Cisco
1240          * APs clearly state the range is -127 to 127 dBm, which indicates
1241          * a signed byte, although it seemingly never actually goes negative.
1242          * The other byte seems to always be zero.
1243          */
1244         *pwr_level = (__s8)cisco_dtpc_ie[4];
1245 }
1246
1247 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1248                                        struct ieee80211_channel *channel,
1249                                        struct ieee80211_mgmt *mgmt,
1250                                        const u8 *country_ie, u8 country_ie_len,
1251                                        const u8 *pwr_constr_ie,
1252                                        const u8 *cisco_dtpc_ie)
1253 {
1254         bool has_80211h_pwr = false, has_cisco_pwr = false;
1255         int chan_pwr = 0, pwr_reduction_80211h = 0;
1256         int pwr_level_cisco, pwr_level_80211h;
1257         int new_ap_level;
1258
1259         if (country_ie && pwr_constr_ie &&
1260             mgmt->u.probe_resp.capab_info &
1261                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT)) {
1262                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1263                         sdata, channel, country_ie, country_ie_len,
1264                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1265                 pwr_level_80211h =
1266                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1267         }
1268
1269         if (cisco_dtpc_ie) {
1270                 ieee80211_find_cisco_dtpc(
1271                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1272                 has_cisco_pwr = true;
1273         }
1274
1275         if (!has_80211h_pwr && !has_cisco_pwr)
1276                 return 0;
1277
1278         /* If we have both 802.11h and Cisco DTPC, apply both limits
1279          * by picking the smallest of the two power levels advertised.
1280          */
1281         if (has_80211h_pwr &&
1282             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1283                 sdata_info(sdata,
1284                            "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1285                            pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1286                            sdata->u.mgd.bssid);
1287                 new_ap_level = pwr_level_80211h;
1288         } else {  /* has_cisco_pwr is always true here. */
1289                 sdata_info(sdata,
1290                            "Limiting TX power to %d dBm as advertised by %pM\n",
1291                            pwr_level_cisco, sdata->u.mgd.bssid);
1292                 new_ap_level = pwr_level_cisco;
1293         }
1294
1295         if (sdata->ap_power_level == new_ap_level)
1296                 return 0;
1297
1298         sdata->ap_power_level = new_ap_level;
1299         if (__ieee80211_recalc_txpower(sdata))
1300                 return BSS_CHANGED_TXPOWER;
1301         return 0;
1302 }
1303
1304 /* powersave */
1305 static void ieee80211_enable_ps(struct ieee80211_local *local,
1306                                 struct ieee80211_sub_if_data *sdata)
1307 {
1308         struct ieee80211_conf *conf = &local->hw.conf;
1309
1310         /*
1311          * If we are scanning right now then the parameters will
1312          * take effect when scan finishes.
1313          */
1314         if (local->scanning)
1315                 return;
1316
1317         if (conf->dynamic_ps_timeout > 0 &&
1318             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1319                 mod_timer(&local->dynamic_ps_timer, jiffies +
1320                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1321         } else {
1322                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1323                         ieee80211_send_nullfunc(local, sdata, 1);
1324
1325                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1326                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1327                         return;
1328
1329                 conf->flags |= IEEE80211_CONF_PS;
1330                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1331         }
1332 }
1333
1334 static void ieee80211_change_ps(struct ieee80211_local *local)
1335 {
1336         struct ieee80211_conf *conf = &local->hw.conf;
1337
1338         if (local->ps_sdata) {
1339                 ieee80211_enable_ps(local, local->ps_sdata);
1340         } else if (conf->flags & IEEE80211_CONF_PS) {
1341                 conf->flags &= ~IEEE80211_CONF_PS;
1342                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1343                 del_timer_sync(&local->dynamic_ps_timer);
1344                 cancel_work_sync(&local->dynamic_ps_enable_work);
1345         }
1346 }
1347
1348 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1349 {
1350         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1351         struct sta_info *sta = NULL;
1352         bool authorized = false;
1353
1354         if (!mgd->powersave)
1355                 return false;
1356
1357         if (mgd->broken_ap)
1358                 return false;
1359
1360         if (!mgd->associated)
1361                 return false;
1362
1363         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1364                 return false;
1365
1366         if (!mgd->have_beacon)
1367                 return false;
1368
1369         rcu_read_lock();
1370         sta = sta_info_get(sdata, mgd->bssid);
1371         if (sta)
1372                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1373         rcu_read_unlock();
1374
1375         return authorized;
1376 }
1377
1378 /* need to hold RTNL or interface lock */
1379 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1380 {
1381         struct ieee80211_sub_if_data *sdata, *found = NULL;
1382         int count = 0;
1383         int timeout;
1384
1385         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1386                 local->ps_sdata = NULL;
1387                 return;
1388         }
1389
1390         list_for_each_entry(sdata, &local->interfaces, list) {
1391                 if (!ieee80211_sdata_running(sdata))
1392                         continue;
1393                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1394                         /* If an AP vif is found, then disable PS
1395                          * by setting the count to zero thereby setting
1396                          * ps_sdata to NULL.
1397                          */
1398                         count = 0;
1399                         break;
1400                 }
1401                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1402                         continue;
1403                 found = sdata;
1404                 count++;
1405         }
1406
1407         if (count == 1 && ieee80211_powersave_allowed(found)) {
1408                 s32 beaconint_us;
1409
1410                 if (latency < 0)
1411                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1412
1413                 beaconint_us = ieee80211_tu_to_usec(
1414                                         found->vif.bss_conf.beacon_int);
1415
1416                 timeout = local->dynamic_ps_forced_timeout;
1417                 if (timeout < 0) {
1418                         /*
1419                          * Go to full PSM if the user configures a very low
1420                          * latency requirement.
1421                          * The 2000 second value is there for compatibility
1422                          * until the PM_QOS_NETWORK_LATENCY is configured
1423                          * with real values.
1424                          */
1425                         if (latency > (1900 * USEC_PER_MSEC) &&
1426                             latency != (2000 * USEC_PER_SEC))
1427                                 timeout = 0;
1428                         else
1429                                 timeout = 100;
1430                 }
1431                 local->hw.conf.dynamic_ps_timeout = timeout;
1432
1433                 if (beaconint_us > latency) {
1434                         local->ps_sdata = NULL;
1435                 } else {
1436                         int maxslp = 1;
1437                         u8 dtimper = found->u.mgd.dtim_period;
1438
1439                         /* If the TIM IE is invalid, pretend the value is 1 */
1440                         if (!dtimper)
1441                                 dtimper = 1;
1442                         else if (dtimper > 1)
1443                                 maxslp = min_t(int, dtimper,
1444                                                     latency / beaconint_us);
1445
1446                         local->hw.conf.max_sleep_period = maxslp;
1447                         local->hw.conf.ps_dtim_period = dtimper;
1448                         local->ps_sdata = found;
1449                 }
1450         } else {
1451                 local->ps_sdata = NULL;
1452         }
1453
1454         ieee80211_change_ps(local);
1455 }
1456
1457 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1458 {
1459         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1460
1461         if (sdata->vif.bss_conf.ps != ps_allowed) {
1462                 sdata->vif.bss_conf.ps = ps_allowed;
1463                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1464         }
1465 }
1466
1467 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1468 {
1469         struct ieee80211_local *local =
1470                 container_of(work, struct ieee80211_local,
1471                              dynamic_ps_disable_work);
1472
1473         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1474                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1475                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1476         }
1477
1478         ieee80211_wake_queues_by_reason(&local->hw,
1479                                         IEEE80211_MAX_QUEUE_MAP,
1480                                         IEEE80211_QUEUE_STOP_REASON_PS,
1481                                         false);
1482 }
1483
1484 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1485 {
1486         struct ieee80211_local *local =
1487                 container_of(work, struct ieee80211_local,
1488                              dynamic_ps_enable_work);
1489         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1490         struct ieee80211_if_managed *ifmgd;
1491         unsigned long flags;
1492         int q;
1493
1494         /* can only happen when PS was just disabled anyway */
1495         if (!sdata)
1496                 return;
1497
1498         ifmgd = &sdata->u.mgd;
1499
1500         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1501                 return;
1502
1503         if (local->hw.conf.dynamic_ps_timeout > 0) {
1504                 /* don't enter PS if TX frames are pending */
1505                 if (drv_tx_frames_pending(local)) {
1506                         mod_timer(&local->dynamic_ps_timer, jiffies +
1507                                   msecs_to_jiffies(
1508                                   local->hw.conf.dynamic_ps_timeout));
1509                         return;
1510                 }
1511
1512                 /*
1513                  * transmission can be stopped by others which leads to
1514                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1515                  * is not the actual idle state.
1516                  */
1517                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1518                 for (q = 0; q < local->hw.queues; q++) {
1519                         if (local->queue_stop_reasons[q]) {
1520                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1521                                                        flags);
1522                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1523                                           msecs_to_jiffies(
1524                                           local->hw.conf.dynamic_ps_timeout));
1525                                 return;
1526                         }
1527                 }
1528                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1529         }
1530
1531         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1532             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1533                 if (drv_tx_frames_pending(local)) {
1534                         mod_timer(&local->dynamic_ps_timer, jiffies +
1535                                   msecs_to_jiffies(
1536                                   local->hw.conf.dynamic_ps_timeout));
1537                 } else {
1538                         ieee80211_send_nullfunc(local, sdata, 1);
1539                         /* Flush to get the tx status of nullfunc frame */
1540                         ieee80211_flush_queues(local, sdata);
1541                 }
1542         }
1543
1544         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1545               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1546             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1547                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1548                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1549                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1550         }
1551 }
1552
1553 void ieee80211_dynamic_ps_timer(unsigned long data)
1554 {
1555         struct ieee80211_local *local = (void *) data;
1556
1557         if (local->quiescing || local->suspended)
1558                 return;
1559
1560         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1561 }
1562
1563 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1564 {
1565         struct delayed_work *delayed_work =
1566                 container_of(work, struct delayed_work, work);
1567         struct ieee80211_sub_if_data *sdata =
1568                 container_of(delayed_work, struct ieee80211_sub_if_data,
1569                              dfs_cac_timer_work);
1570         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1571
1572         mutex_lock(&sdata->local->mtx);
1573         if (sdata->wdev.cac_started) {
1574                 ieee80211_vif_release_channel(sdata);
1575                 cfg80211_cac_event(sdata->dev, &chandef,
1576                                    NL80211_RADAR_CAC_FINISHED,
1577                                    GFP_KERNEL);
1578         }
1579         mutex_unlock(&sdata->local->mtx);
1580 }
1581
1582 /* MLME */
1583 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1584                                      struct ieee80211_sub_if_data *sdata,
1585                                      const u8 *wmm_param, size_t wmm_param_len)
1586 {
1587         struct ieee80211_tx_queue_params params;
1588         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1589         size_t left;
1590         int count;
1591         const u8 *pos;
1592         u8 uapsd_queues = 0;
1593
1594         if (!local->ops->conf_tx)
1595                 return false;
1596
1597         if (local->hw.queues < IEEE80211_NUM_ACS)
1598                 return false;
1599
1600         if (!wmm_param)
1601                 return false;
1602
1603         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1604                 return false;
1605
1606         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1607                 uapsd_queues = ifmgd->uapsd_queues;
1608
1609         count = wmm_param[6] & 0x0f;
1610         if (count == ifmgd->wmm_last_param_set)
1611                 return false;
1612         ifmgd->wmm_last_param_set = count;
1613
1614         pos = wmm_param + 8;
1615         left = wmm_param_len - 8;
1616
1617         memset(&params, 0, sizeof(params));
1618
1619         sdata->wmm_acm = 0;
1620         for (; left >= 4; left -= 4, pos += 4) {
1621                 int aci = (pos[0] >> 5) & 0x03;
1622                 int acm = (pos[0] >> 4) & 0x01;
1623                 bool uapsd = false;
1624                 int queue;
1625
1626                 switch (aci) {
1627                 case 1: /* AC_BK */
1628                         queue = 3;
1629                         if (acm)
1630                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1631                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1632                                 uapsd = true;
1633                         break;
1634                 case 2: /* AC_VI */
1635                         queue = 1;
1636                         if (acm)
1637                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1638                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1639                                 uapsd = true;
1640                         break;
1641                 case 3: /* AC_VO */
1642                         queue = 0;
1643                         if (acm)
1644                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1645                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1646                                 uapsd = true;
1647                         break;
1648                 case 0: /* AC_BE */
1649                 default:
1650                         queue = 2;
1651                         if (acm)
1652                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1653                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1654                                 uapsd = true;
1655                         break;
1656                 }
1657
1658                 params.aifs = pos[0] & 0x0f;
1659                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1660                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1661                 params.txop = get_unaligned_le16(pos + 2);
1662                 params.acm = acm;
1663                 params.uapsd = uapsd;
1664
1665                 mlme_dbg(sdata,
1666                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1667                          queue, aci, acm,
1668                          params.aifs, params.cw_min, params.cw_max,
1669                          params.txop, params.uapsd);
1670                 sdata->tx_conf[queue] = params;
1671                 if (drv_conf_tx(local, sdata, queue, &params))
1672                         sdata_err(sdata,
1673                                   "failed to set TX queue parameters for queue %d\n",
1674                                   queue);
1675         }
1676
1677         /* enable WMM or activate new settings */
1678         sdata->vif.bss_conf.qos = true;
1679         return true;
1680 }
1681
1682 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1683 {
1684         lockdep_assert_held(&sdata->local->mtx);
1685
1686         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1687         ieee80211_run_deferred_scan(sdata->local);
1688 }
1689
1690 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1691 {
1692         mutex_lock(&sdata->local->mtx);
1693         __ieee80211_stop_poll(sdata);
1694         mutex_unlock(&sdata->local->mtx);
1695 }
1696
1697 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1698                                            u16 capab, bool erp_valid, u8 erp)
1699 {
1700         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1701         u32 changed = 0;
1702         bool use_protection;
1703         bool use_short_preamble;
1704         bool use_short_slot;
1705
1706         if (erp_valid) {
1707                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1708                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1709         } else {
1710                 use_protection = false;
1711                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1712         }
1713
1714         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1715         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1716                 use_short_slot = true;
1717
1718         if (use_protection != bss_conf->use_cts_prot) {
1719                 bss_conf->use_cts_prot = use_protection;
1720                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1721         }
1722
1723         if (use_short_preamble != bss_conf->use_short_preamble) {
1724                 bss_conf->use_short_preamble = use_short_preamble;
1725                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1726         }
1727
1728         if (use_short_slot != bss_conf->use_short_slot) {
1729                 bss_conf->use_short_slot = use_short_slot;
1730                 changed |= BSS_CHANGED_ERP_SLOT;
1731         }
1732
1733         return changed;
1734 }
1735
1736 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1737                                      struct cfg80211_bss *cbss,
1738                                      u32 bss_info_changed)
1739 {
1740         struct ieee80211_bss *bss = (void *)cbss->priv;
1741         struct ieee80211_local *local = sdata->local;
1742         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1743
1744         bss_info_changed |= BSS_CHANGED_ASSOC;
1745         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1746                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1747
1748         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1749                 beacon_loss_count * bss_conf->beacon_int));
1750
1751         sdata->u.mgd.associated = cbss;
1752         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1753
1754         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1755
1756         if (sdata->vif.p2p) {
1757                 const struct cfg80211_bss_ies *ies;
1758
1759                 rcu_read_lock();
1760                 ies = rcu_dereference(cbss->ies);
1761                 if (ies) {
1762                         int ret;
1763
1764                         ret = cfg80211_get_p2p_attr(
1765                                         ies->data, ies->len,
1766                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1767                                         (u8 *) &bss_conf->p2p_noa_attr,
1768                                         sizeof(bss_conf->p2p_noa_attr));
1769                         if (ret >= 2) {
1770                                 sdata->u.mgd.p2p_noa_index =
1771                                         bss_conf->p2p_noa_attr.index;
1772                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1773                         }
1774                 }
1775                 rcu_read_unlock();
1776         }
1777
1778         /* just to be sure */
1779         ieee80211_stop_poll(sdata);
1780
1781         ieee80211_led_assoc(local, 1);
1782
1783         if (sdata->u.mgd.have_beacon) {
1784                 /*
1785                  * If the AP is buggy we may get here with no DTIM period
1786                  * known, so assume it's 1 which is the only safe assumption
1787                  * in that case, although if the TIM IE is broken powersave
1788                  * probably just won't work at all.
1789                  */
1790                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1791                 bss_conf->beacon_rate = bss->beacon_rate;
1792                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1793         } else {
1794                 bss_conf->beacon_rate = NULL;
1795                 bss_conf->dtim_period = 0;
1796         }
1797
1798         bss_conf->assoc = 1;
1799
1800         /* Tell the driver to monitor connection quality (if supported) */
1801         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1802             bss_conf->cqm_rssi_thold)
1803                 bss_info_changed |= BSS_CHANGED_CQM;
1804
1805         /* Enable ARP filtering */
1806         if (bss_conf->arp_addr_cnt)
1807                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1808
1809         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1810
1811         mutex_lock(&local->iflist_mtx);
1812         ieee80211_recalc_ps(local, -1);
1813         mutex_unlock(&local->iflist_mtx);
1814
1815         ieee80211_recalc_smps(sdata);
1816         ieee80211_recalc_ps_vif(sdata);
1817
1818         netif_carrier_on(sdata->dev);
1819 }
1820
1821 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1822                                    u16 stype, u16 reason, bool tx,
1823                                    u8 *frame_buf)
1824 {
1825         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1826         struct ieee80211_local *local = sdata->local;
1827         u32 changed = 0;
1828
1829         sdata_assert_lock(sdata);
1830
1831         if (WARN_ON_ONCE(tx && !frame_buf))
1832                 return;
1833
1834         if (WARN_ON(!ifmgd->associated))
1835                 return;
1836
1837         ieee80211_stop_poll(sdata);
1838
1839         ifmgd->associated = NULL;
1840         netif_carrier_off(sdata->dev);
1841
1842         /*
1843          * if we want to get out of ps before disassoc (why?) we have
1844          * to do it before sending disassoc, as otherwise the null-packet
1845          * won't be valid.
1846          */
1847         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1848                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1849                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1850         }
1851         local->ps_sdata = NULL;
1852
1853         /* disable per-vif ps */
1854         ieee80211_recalc_ps_vif(sdata);
1855
1856         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1857         if (tx)
1858                 ieee80211_flush_queues(local, sdata);
1859
1860         /* deauthenticate/disassociate now */
1861         if (tx || frame_buf)
1862                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1863                                                reason, tx, frame_buf);
1864
1865         /* flush out frame */
1866         if (tx)
1867                 ieee80211_flush_queues(local, sdata);
1868
1869         /* clear bssid only after building the needed mgmt frames */
1870         memset(ifmgd->bssid, 0, ETH_ALEN);
1871
1872         /* remove AP and TDLS peers */
1873         sta_info_flush(sdata);
1874
1875         /* finally reset all BSS / config parameters */
1876         changed |= ieee80211_reset_erp_info(sdata);
1877
1878         ieee80211_led_assoc(local, 0);
1879         changed |= BSS_CHANGED_ASSOC;
1880         sdata->vif.bss_conf.assoc = false;
1881
1882         ifmgd->p2p_noa_index = -1;
1883         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
1884                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1885
1886         /* on the next assoc, re-program HT/VHT parameters */
1887         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1888         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1889         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
1890         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1891
1892         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1893
1894         del_timer_sync(&local->dynamic_ps_timer);
1895         cancel_work_sync(&local->dynamic_ps_enable_work);
1896
1897         /* Disable ARP filtering */
1898         if (sdata->vif.bss_conf.arp_addr_cnt)
1899                 changed |= BSS_CHANGED_ARP_FILTER;
1900
1901         sdata->vif.bss_conf.qos = false;
1902         changed |= BSS_CHANGED_QOS;
1903
1904         /* The BSSID (not really interesting) and HT changed */
1905         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1906         ieee80211_bss_info_change_notify(sdata, changed);
1907
1908         /* disassociated - set to defaults now */
1909         ieee80211_set_wmm_default(sdata, false);
1910
1911         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1912         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1913         del_timer_sync(&sdata->u.mgd.timer);
1914         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1915
1916         sdata->vif.bss_conf.dtim_period = 0;
1917         sdata->vif.bss_conf.beacon_rate = NULL;
1918
1919         ifmgd->have_beacon = false;
1920
1921         ifmgd->flags = 0;
1922         mutex_lock(&local->mtx);
1923         ieee80211_vif_release_channel(sdata);
1924
1925         sdata->vif.csa_active = false;
1926         if (sdata->csa_block_tx) {
1927                 ieee80211_wake_vif_queues(local, sdata,
1928                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1929                 sdata->csa_block_tx = false;
1930         }
1931         mutex_unlock(&local->mtx);
1932
1933         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1934 }
1935
1936 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1937                              struct ieee80211_hdr *hdr)
1938 {
1939         /*
1940          * We can postpone the mgd.timer whenever receiving unicast frames
1941          * from AP because we know that the connection is working both ways
1942          * at that time. But multicast frames (and hence also beacons) must
1943          * be ignored here, because we need to trigger the timer during
1944          * data idle periods for sending the periodic probe request to the
1945          * AP we're connected to.
1946          */
1947         if (is_multicast_ether_addr(hdr->addr1))
1948                 return;
1949
1950         ieee80211_sta_reset_conn_monitor(sdata);
1951 }
1952
1953 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1954 {
1955         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1956         struct ieee80211_local *local = sdata->local;
1957
1958         mutex_lock(&local->mtx);
1959         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
1960                 goto out;
1961
1962         __ieee80211_stop_poll(sdata);
1963
1964         mutex_lock(&local->iflist_mtx);
1965         ieee80211_recalc_ps(local, -1);
1966         mutex_unlock(&local->iflist_mtx);
1967
1968         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1969                 goto out;
1970
1971         /*
1972          * We've received a probe response, but are not sure whether
1973          * we have or will be receiving any beacons or data, so let's
1974          * schedule the timers again, just in case.
1975          */
1976         ieee80211_sta_reset_beacon_monitor(sdata);
1977
1978         mod_timer(&ifmgd->conn_mon_timer,
1979                   round_jiffies_up(jiffies +
1980                                    IEEE80211_CONNECTION_IDLE_TIME));
1981 out:
1982         mutex_unlock(&local->mtx);
1983 }
1984
1985 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1986                              struct ieee80211_hdr *hdr, bool ack)
1987 {
1988         if (!ieee80211_is_data(hdr->frame_control))
1989             return;
1990
1991         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1992             sdata->u.mgd.probe_send_count > 0) {
1993                 if (ack)
1994                         ieee80211_sta_reset_conn_monitor(sdata);
1995                 else
1996                         sdata->u.mgd.nullfunc_failed = true;
1997                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1998                 return;
1999         }
2000
2001         if (ack)
2002                 ieee80211_sta_reset_conn_monitor(sdata);
2003 }
2004
2005 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2006 {
2007         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2008         const u8 *ssid;
2009         u8 *dst = ifmgd->associated->bssid;
2010         u8 unicast_limit = max(1, max_probe_tries - 3);
2011
2012         /*
2013          * Try sending broadcast probe requests for the last three
2014          * probe requests after the first ones failed since some
2015          * buggy APs only support broadcast probe requests.
2016          */
2017         if (ifmgd->probe_send_count >= unicast_limit)
2018                 dst = NULL;
2019
2020         /*
2021          * When the hardware reports an accurate Tx ACK status, it's
2022          * better to send a nullfunc frame instead of a probe request,
2023          * as it will kick us off the AP quickly if we aren't associated
2024          * anymore. The timeout will be reset if the frame is ACKed by
2025          * the AP.
2026          */
2027         ifmgd->probe_send_count++;
2028
2029         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2030                 ifmgd->nullfunc_failed = false;
2031                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2032         } else {
2033                 int ssid_len;
2034
2035                 rcu_read_lock();
2036                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2037                 if (WARN_ON_ONCE(ssid == NULL))
2038                         ssid_len = 0;
2039                 else
2040                         ssid_len = ssid[1];
2041
2042                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
2043                                          0, (u32) -1, true, 0,
2044                                          ifmgd->associated->channel, false);
2045                 rcu_read_unlock();
2046         }
2047
2048         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2049         run_again(sdata, ifmgd->probe_timeout);
2050         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2051                 ieee80211_flush_queues(sdata->local, sdata);
2052 }
2053
2054 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2055                                    bool beacon)
2056 {
2057         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2058         bool already = false;
2059
2060         if (!ieee80211_sdata_running(sdata))
2061                 return;
2062
2063         sdata_lock(sdata);
2064
2065         if (!ifmgd->associated)
2066                 goto out;
2067
2068         mutex_lock(&sdata->local->mtx);
2069
2070         if (sdata->local->tmp_channel || sdata->local->scanning) {
2071                 mutex_unlock(&sdata->local->mtx);
2072                 goto out;
2073         }
2074
2075         if (beacon) {
2076                 mlme_dbg_ratelimited(sdata,
2077                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2078                                      beacon_loss_count);
2079
2080                 ieee80211_cqm_rssi_notify(&sdata->vif,
2081                                           NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
2082                                           GFP_KERNEL);
2083         }
2084
2085         /*
2086          * The driver/our work has already reported this event or the
2087          * connection monitoring has kicked in and we have already sent
2088          * a probe request. Or maybe the AP died and the driver keeps
2089          * reporting until we disassociate...
2090          *
2091          * In either case we have to ignore the current call to this
2092          * function (except for setting the correct probe reason bit)
2093          * because otherwise we would reset the timer every time and
2094          * never check whether we received a probe response!
2095          */
2096         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2097                 already = true;
2098
2099         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2100
2101         mutex_unlock(&sdata->local->mtx);
2102
2103         if (already)
2104                 goto out;
2105
2106         mutex_lock(&sdata->local->iflist_mtx);
2107         ieee80211_recalc_ps(sdata->local, -1);
2108         mutex_unlock(&sdata->local->iflist_mtx);
2109
2110         ifmgd->probe_send_count = 0;
2111         ieee80211_mgd_probe_ap_send(sdata);
2112  out:
2113         sdata_unlock(sdata);
2114 }
2115
2116 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2117                                           struct ieee80211_vif *vif)
2118 {
2119         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2120         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2121         struct cfg80211_bss *cbss;
2122         struct sk_buff *skb;
2123         const u8 *ssid;
2124         int ssid_len;
2125
2126         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2127                 return NULL;
2128
2129         sdata_assert_lock(sdata);
2130
2131         if (ifmgd->associated)
2132                 cbss = ifmgd->associated;
2133         else if (ifmgd->auth_data)
2134                 cbss = ifmgd->auth_data->bss;
2135         else if (ifmgd->assoc_data)
2136                 cbss = ifmgd->assoc_data->bss;
2137         else
2138                 return NULL;
2139
2140         rcu_read_lock();
2141         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2142         if (WARN_ON_ONCE(ssid == NULL))
2143                 ssid_len = 0;
2144         else
2145                 ssid_len = ssid[1];
2146
2147         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
2148                                         (u32) -1, cbss->channel,
2149                                         ssid + 2, ssid_len,
2150                                         NULL, 0, true);
2151         rcu_read_unlock();
2152
2153         return skb;
2154 }
2155 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2156
2157 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2158 {
2159         struct ieee80211_local *local = sdata->local;
2160         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2161         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2162
2163         sdata_lock(sdata);
2164         if (!ifmgd->associated) {
2165                 sdata_unlock(sdata);
2166                 return;
2167         }
2168
2169         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2170                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2171                                true, frame_buf);
2172         mutex_lock(&local->mtx);
2173         sdata->vif.csa_active = false;
2174         if (sdata->csa_block_tx) {
2175                 ieee80211_wake_vif_queues(local, sdata,
2176                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2177                 sdata->csa_block_tx = false;
2178         }
2179         mutex_unlock(&local->mtx);
2180
2181         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2182                               IEEE80211_DEAUTH_FRAME_LEN);
2183         sdata_unlock(sdata);
2184 }
2185
2186 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2187 {
2188         struct ieee80211_sub_if_data *sdata =
2189                 container_of(work, struct ieee80211_sub_if_data,
2190                              u.mgd.beacon_connection_loss_work);
2191         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2192         struct sta_info *sta;
2193
2194         if (ifmgd->associated) {
2195                 rcu_read_lock();
2196                 sta = sta_info_get(sdata, ifmgd->bssid);
2197                 if (sta)
2198                         sta->beacon_loss_count++;
2199                 rcu_read_unlock();
2200         }
2201
2202         if (ifmgd->connection_loss) {
2203                 sdata_info(sdata, "Connection to AP %pM lost\n",
2204                            ifmgd->bssid);
2205                 __ieee80211_disconnect(sdata);
2206         } else {
2207                 ieee80211_mgd_probe_ap(sdata, true);
2208         }
2209 }
2210
2211 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2212 {
2213         struct ieee80211_sub_if_data *sdata =
2214                 container_of(work, struct ieee80211_sub_if_data,
2215                              u.mgd.csa_connection_drop_work);
2216
2217         __ieee80211_disconnect(sdata);
2218 }
2219
2220 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2221 {
2222         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2223         struct ieee80211_hw *hw = &sdata->local->hw;
2224
2225         trace_api_beacon_loss(sdata);
2226
2227         sdata->u.mgd.connection_loss = false;
2228         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2229 }
2230 EXPORT_SYMBOL(ieee80211_beacon_loss);
2231
2232 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2233 {
2234         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2235         struct ieee80211_hw *hw = &sdata->local->hw;
2236
2237         trace_api_connection_loss(sdata);
2238
2239         sdata->u.mgd.connection_loss = true;
2240         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2241 }
2242 EXPORT_SYMBOL(ieee80211_connection_loss);
2243
2244
2245 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2246                                         bool assoc)
2247 {
2248         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2249
2250         sdata_assert_lock(sdata);
2251
2252         if (!assoc) {
2253                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2254
2255                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2256                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2257                 sdata->u.mgd.flags = 0;
2258                 mutex_lock(&sdata->local->mtx);
2259                 ieee80211_vif_release_channel(sdata);
2260                 mutex_unlock(&sdata->local->mtx);
2261         }
2262
2263         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2264         kfree(auth_data);
2265         sdata->u.mgd.auth_data = NULL;
2266 }
2267
2268 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2269                                      struct ieee80211_mgmt *mgmt, size_t len)
2270 {
2271         struct ieee80211_local *local = sdata->local;
2272         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2273         u8 *pos;
2274         struct ieee802_11_elems elems;
2275         u32 tx_flags = 0;
2276
2277         pos = mgmt->u.auth.variable;
2278         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2279         if (!elems.challenge)
2280                 return;
2281         auth_data->expected_transaction = 4;
2282         drv_mgd_prepare_tx(sdata->local, sdata);
2283         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2284                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2285                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2286         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2287                             elems.challenge - 2, elems.challenge_len + 2,
2288                             auth_data->bss->bssid, auth_data->bss->bssid,
2289                             auth_data->key, auth_data->key_len,
2290                             auth_data->key_idx, tx_flags);
2291 }
2292
2293 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2294                                    struct ieee80211_mgmt *mgmt, size_t len)
2295 {
2296         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2297         u8 bssid[ETH_ALEN];
2298         u16 auth_alg, auth_transaction, status_code;
2299         struct sta_info *sta;
2300
2301         sdata_assert_lock(sdata);
2302
2303         if (len < 24 + 6)
2304                 return;
2305
2306         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2307                 return;
2308
2309         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2310
2311         if (!ether_addr_equal(bssid, mgmt->bssid))
2312                 return;
2313
2314         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2315         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2316         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2317
2318         if (auth_alg != ifmgd->auth_data->algorithm ||
2319             auth_transaction != ifmgd->auth_data->expected_transaction) {
2320                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2321                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2322                            auth_transaction,
2323                            ifmgd->auth_data->expected_transaction);
2324                 return;
2325         }
2326
2327         if (status_code != WLAN_STATUS_SUCCESS) {
2328                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2329                            mgmt->sa, status_code);
2330                 ieee80211_destroy_auth_data(sdata, false);
2331                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2332                 return;
2333         }
2334
2335         switch (ifmgd->auth_data->algorithm) {
2336         case WLAN_AUTH_OPEN:
2337         case WLAN_AUTH_LEAP:
2338         case WLAN_AUTH_FT:
2339         case WLAN_AUTH_SAE:
2340                 break;
2341         case WLAN_AUTH_SHARED_KEY:
2342                 if (ifmgd->auth_data->expected_transaction != 4) {
2343                         ieee80211_auth_challenge(sdata, mgmt, len);
2344                         /* need another frame */
2345                         return;
2346                 }
2347                 break;
2348         default:
2349                 WARN_ONCE(1, "invalid auth alg %d",
2350                           ifmgd->auth_data->algorithm);
2351                 return;
2352         }
2353
2354         sdata_info(sdata, "authenticated\n");
2355         ifmgd->auth_data->done = true;
2356         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2357         ifmgd->auth_data->timeout_started = true;
2358         run_again(sdata, ifmgd->auth_data->timeout);
2359
2360         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2361             ifmgd->auth_data->expected_transaction != 2) {
2362                 /*
2363                  * Report auth frame to user space for processing since another
2364                  * round of Authentication frames is still needed.
2365                  */
2366                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2367                 return;
2368         }
2369
2370         /* move station state to auth */
2371         mutex_lock(&sdata->local->sta_mtx);
2372         sta = sta_info_get(sdata, bssid);
2373         if (!sta) {
2374                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2375                 goto out_err;
2376         }
2377         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2378                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2379                 goto out_err;
2380         }
2381         mutex_unlock(&sdata->local->sta_mtx);
2382
2383         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2384         return;
2385  out_err:
2386         mutex_unlock(&sdata->local->sta_mtx);
2387         /* ignore frame -- wait for timeout */
2388 }
2389
2390 #define case_WLAN(type) \
2391         case WLAN_REASON_##type: return #type
2392
2393 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2394 {
2395         switch (reason_code) {
2396         case_WLAN(UNSPECIFIED);
2397         case_WLAN(PREV_AUTH_NOT_VALID);
2398         case_WLAN(DEAUTH_LEAVING);
2399         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2400         case_WLAN(DISASSOC_AP_BUSY);
2401         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2402         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2403         case_WLAN(DISASSOC_STA_HAS_LEFT);
2404         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2405         case_WLAN(DISASSOC_BAD_POWER);
2406         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2407         case_WLAN(INVALID_IE);
2408         case_WLAN(MIC_FAILURE);
2409         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2410         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2411         case_WLAN(IE_DIFFERENT);
2412         case_WLAN(INVALID_GROUP_CIPHER);
2413         case_WLAN(INVALID_PAIRWISE_CIPHER);
2414         case_WLAN(INVALID_AKMP);
2415         case_WLAN(UNSUPP_RSN_VERSION);
2416         case_WLAN(INVALID_RSN_IE_CAP);
2417         case_WLAN(IEEE8021X_FAILED);
2418         case_WLAN(CIPHER_SUITE_REJECTED);
2419         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2420         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2421         case_WLAN(DISASSOC_LOW_ACK);
2422         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2423         case_WLAN(QSTA_LEAVE_QBSS);
2424         case_WLAN(QSTA_NOT_USE);
2425         case_WLAN(QSTA_REQUIRE_SETUP);
2426         case_WLAN(QSTA_TIMEOUT);
2427         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2428         case_WLAN(MESH_PEER_CANCELED);
2429         case_WLAN(MESH_MAX_PEERS);
2430         case_WLAN(MESH_CONFIG);
2431         case_WLAN(MESH_CLOSE);
2432         case_WLAN(MESH_MAX_RETRIES);
2433         case_WLAN(MESH_CONFIRM_TIMEOUT);
2434         case_WLAN(MESH_INVALID_GTK);
2435         case_WLAN(MESH_INCONSISTENT_PARAM);
2436         case_WLAN(MESH_INVALID_SECURITY);
2437         case_WLAN(MESH_PATH_ERROR);
2438         case_WLAN(MESH_PATH_NOFORWARD);
2439         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2440         case_WLAN(MAC_EXISTS_IN_MBSS);
2441         case_WLAN(MESH_CHAN_REGULATORY);
2442         case_WLAN(MESH_CHAN);
2443         default: return "<unknown>";
2444         }
2445 }
2446
2447 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2448                                      struct ieee80211_mgmt *mgmt, size_t len)
2449 {
2450         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2451         const u8 *bssid = NULL;
2452         u16 reason_code;
2453
2454         sdata_assert_lock(sdata);
2455
2456         if (len < 24 + 2)
2457                 return;
2458
2459         if (!ifmgd->associated ||
2460             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2461                 return;
2462
2463         bssid = ifmgd->associated->bssid;
2464
2465         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2466
2467         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2468                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2469
2470         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2471
2472         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2473 }
2474
2475
2476 static void ieee80211_rx_mgmt_disassoc(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         u16 reason_code;
2481
2482         sdata_assert_lock(sdata);
2483
2484         if (len < 24 + 2)
2485                 return;
2486
2487         if (!ifmgd->associated ||
2488             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2489                 return;
2490
2491         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2492
2493         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2494                    mgmt->sa, reason_code);
2495
2496         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2497
2498         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2499 }
2500
2501 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2502                                 u8 *supp_rates, unsigned int supp_rates_len,
2503                                 u32 *rates, u32 *basic_rates,
2504                                 bool *have_higher_than_11mbit,
2505                                 int *min_rate, int *min_rate_index,
2506                                 int shift, u32 rate_flags)
2507 {
2508         int i, j;
2509
2510         for (i = 0; i < supp_rates_len; i++) {
2511                 int rate = supp_rates[i] & 0x7f;
2512                 bool is_basic = !!(supp_rates[i] & 0x80);
2513
2514                 if ((rate * 5 * (1 << shift)) > 110)
2515                         *have_higher_than_11mbit = true;
2516
2517                 /*
2518                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2519                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2520                  *
2521                  * Note: Even through the membership selector and the basic
2522                  *       rate flag share the same bit, they are not exactly
2523                  *       the same.
2524                  */
2525                 if (!!(supp_rates[i] & 0x80) &&
2526                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2527                         continue;
2528
2529                 for (j = 0; j < sband->n_bitrates; j++) {
2530                         struct ieee80211_rate *br;
2531                         int brate;
2532
2533                         br = &sband->bitrates[j];
2534                         if ((rate_flags & br->flags) != rate_flags)
2535                                 continue;
2536
2537                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2538                         if (brate == rate) {
2539                                 *rates |= BIT(j);
2540                                 if (is_basic)
2541                                         *basic_rates |= BIT(j);
2542                                 if ((rate * 5) < *min_rate) {
2543                                         *min_rate = rate * 5;
2544                                         *min_rate_index = j;
2545                                 }
2546                                 break;
2547                         }
2548                 }
2549         }
2550 }
2551
2552 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2553                                          bool assoc)
2554 {
2555         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2556
2557         sdata_assert_lock(sdata);
2558
2559         if (!assoc) {
2560                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2561
2562                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2563                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2564                 sdata->u.mgd.flags = 0;
2565                 mutex_lock(&sdata->local->mtx);
2566                 ieee80211_vif_release_channel(sdata);
2567                 mutex_unlock(&sdata->local->mtx);
2568         }
2569
2570         kfree(assoc_data);
2571         sdata->u.mgd.assoc_data = NULL;
2572 }
2573
2574 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2575                                     struct cfg80211_bss *cbss,
2576                                     struct ieee80211_mgmt *mgmt, size_t len)
2577 {
2578         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2579         struct ieee80211_local *local = sdata->local;
2580         struct ieee80211_supported_band *sband;
2581         struct sta_info *sta;
2582         u8 *pos;
2583         u16 capab_info, aid;
2584         struct ieee802_11_elems elems;
2585         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2586         const struct cfg80211_bss_ies *bss_ies = NULL;
2587         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2588         u32 changed = 0;
2589         int err;
2590         bool ret;
2591
2592         /* AssocResp and ReassocResp have identical structure */
2593
2594         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2595         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2596
2597         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2598                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2599                            aid);
2600         aid &= ~(BIT(15) | BIT(14));
2601
2602         ifmgd->broken_ap = false;
2603
2604         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2605                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2606                            aid);
2607                 aid = 0;
2608                 ifmgd->broken_ap = true;
2609         }
2610
2611         pos = mgmt->u.assoc_resp.variable;
2612         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2613
2614         if (!elems.supp_rates) {
2615                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2616                 return false;
2617         }
2618
2619         ifmgd->aid = aid;
2620
2621         /*
2622          * Some APs are erroneously not including some information in their
2623          * (re)association response frames. Try to recover by using the data
2624          * from the beacon or probe response. This seems to afflict mobile
2625          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2626          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2627          */
2628         if ((assoc_data->wmm && !elems.wmm_param) ||
2629             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2630              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2631             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2632              (!elems.vht_cap_elem || !elems.vht_operation))) {
2633                 const struct cfg80211_bss_ies *ies;
2634                 struct ieee802_11_elems bss_elems;
2635
2636                 rcu_read_lock();
2637                 ies = rcu_dereference(cbss->ies);
2638                 if (ies)
2639                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2640                                           GFP_ATOMIC);
2641                 rcu_read_unlock();
2642                 if (!bss_ies)
2643                         return false;
2644
2645                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2646                                        false, &bss_elems);
2647                 if (assoc_data->wmm &&
2648                     !elems.wmm_param && bss_elems.wmm_param) {
2649                         elems.wmm_param = bss_elems.wmm_param;
2650                         sdata_info(sdata,
2651                                    "AP bug: WMM param missing from AssocResp\n");
2652                 }
2653
2654                 /*
2655                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2656                  * have to include the IEs in the (re)association response.
2657                  */
2658                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2659                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2660                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2661                         sdata_info(sdata,
2662                                    "AP bug: HT capability missing from AssocResp\n");
2663                 }
2664                 if (!elems.ht_operation && bss_elems.ht_operation &&
2665                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2666                         elems.ht_operation = bss_elems.ht_operation;
2667                         sdata_info(sdata,
2668                                    "AP bug: HT operation missing from AssocResp\n");
2669                 }
2670                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2671                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2672                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2673                         sdata_info(sdata,
2674                                    "AP bug: VHT capa missing from AssocResp\n");
2675                 }
2676                 if (!elems.vht_operation && bss_elems.vht_operation &&
2677                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2678                         elems.vht_operation = bss_elems.vht_operation;
2679                         sdata_info(sdata,
2680                                    "AP bug: VHT operation missing from AssocResp\n");
2681                 }
2682         }
2683
2684         /*
2685          * We previously checked these in the beacon/probe response, so
2686          * they should be present here. This is just a safety net.
2687          */
2688         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2689             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2690                 sdata_info(sdata,
2691                            "HT AP is missing WMM params or HT capability/operation\n");
2692                 ret = false;
2693                 goto out;
2694         }
2695
2696         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2697             (!elems.vht_cap_elem || !elems.vht_operation)) {
2698                 sdata_info(sdata,
2699                            "VHT AP is missing VHT capability/operation\n");
2700                 ret = false;
2701                 goto out;
2702         }
2703
2704         mutex_lock(&sdata->local->sta_mtx);
2705         /*
2706          * station info was already allocated and inserted before
2707          * the association and should be available to us
2708          */
2709         sta = sta_info_get(sdata, cbss->bssid);
2710         if (WARN_ON(!sta)) {
2711                 mutex_unlock(&sdata->local->sta_mtx);
2712                 ret = false;
2713                 goto out;
2714         }
2715
2716         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2717
2718         /* Set up internal HT/VHT capabilities */
2719         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2720                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2721                                                   elems.ht_cap_elem, sta);
2722
2723         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2724                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2725                                                     elems.vht_cap_elem, sta);
2726
2727         /*
2728          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2729          * in their association response, so ignore that data for our own
2730          * configuration. If it changed since the last beacon, we'll get the
2731          * next beacon and update then.
2732          */
2733
2734         /*
2735          * If an operating mode notification IE is present, override the
2736          * NSS calculation (that would be done in rate_control_rate_init())
2737          * and use the # of streams from that element.
2738          */
2739         if (elems.opmode_notif &&
2740             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2741                 u8 nss;
2742
2743                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2744                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2745                 nss += 1;
2746                 sta->sta.rx_nss = nss;
2747         }
2748
2749         rate_control_rate_init(sta);
2750
2751         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2752                 set_sta_flag(sta, WLAN_STA_MFP);
2753
2754         sta->sta.wme = elems.wmm_param;
2755
2756         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2757         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2758                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2759         if (err) {
2760                 sdata_info(sdata,
2761                            "failed to move station %pM to desired state\n",
2762                            sta->sta.addr);
2763                 WARN_ON(__sta_info_destroy(sta));
2764                 mutex_unlock(&sdata->local->sta_mtx);
2765                 ret = false;
2766                 goto out;
2767         }
2768
2769         mutex_unlock(&sdata->local->sta_mtx);
2770
2771         /*
2772          * Always handle WMM once after association regardless
2773          * of the first value the AP uses. Setting -1 here has
2774          * that effect because the AP values is an unsigned
2775          * 4-bit value.
2776          */
2777         ifmgd->wmm_last_param_set = -1;
2778
2779         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2780                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2781                                          elems.wmm_param_len);
2782         else
2783                 ieee80211_set_wmm_default(sdata, false);
2784         changed |= BSS_CHANGED_QOS;
2785
2786         /* set AID and assoc capability,
2787          * ieee80211_set_associated() will tell the driver */
2788         bss_conf->aid = aid;
2789         bss_conf->assoc_capability = capab_info;
2790         ieee80211_set_associated(sdata, cbss, changed);
2791
2792         /*
2793          * If we're using 4-addr mode, let the AP know that we're
2794          * doing so, so that it can create the STA VLAN on its side
2795          */
2796         if (ifmgd->use_4addr)
2797                 ieee80211_send_4addr_nullfunc(local, sdata);
2798
2799         /*
2800          * Start timer to probe the connection to the AP now.
2801          * Also start the timer that will detect beacon loss.
2802          */
2803         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2804         ieee80211_sta_reset_beacon_monitor(sdata);
2805
2806         ret = true;
2807  out:
2808         kfree(bss_ies);
2809         return ret;
2810 }
2811
2812 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2813                                          struct ieee80211_mgmt *mgmt,
2814                                          size_t len)
2815 {
2816         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2817         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2818         u16 capab_info, status_code, aid;
2819         struct ieee802_11_elems elems;
2820         int ac, uapsd_queues = -1;
2821         u8 *pos;
2822         bool reassoc;
2823         struct cfg80211_bss *bss;
2824
2825         sdata_assert_lock(sdata);
2826
2827         if (!assoc_data)
2828                 return;
2829         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2830                 return;
2831
2832         /*
2833          * AssocResp and ReassocResp have identical structure, so process both
2834          * of them in this function.
2835          */
2836
2837         if (len < 24 + 6)
2838                 return;
2839
2840         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2841         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2842         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2843         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2844
2845         sdata_info(sdata,
2846                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2847                    reassoc ? "Rea" : "A", mgmt->sa,
2848                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2849
2850         pos = mgmt->u.assoc_resp.variable;
2851         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2852
2853         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2854             elems.timeout_int &&
2855             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2856                 u32 tu, ms;
2857                 tu = le32_to_cpu(elems.timeout_int->value);
2858                 ms = tu * 1024 / 1000;
2859                 sdata_info(sdata,
2860                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2861                            mgmt->sa, tu, ms);
2862                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2863                 assoc_data->timeout_started = true;
2864                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2865                         run_again(sdata, assoc_data->timeout);
2866                 return;
2867         }
2868
2869         bss = assoc_data->bss;
2870
2871         if (status_code != WLAN_STATUS_SUCCESS) {
2872                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2873                            mgmt->sa, status_code);
2874                 ieee80211_destroy_assoc_data(sdata, false);
2875         } else {
2876                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
2877                         /* oops -- internal error -- send timeout for now */
2878                         ieee80211_destroy_assoc_data(sdata, false);
2879                         cfg80211_assoc_timeout(sdata->dev, bss);
2880                         return;
2881                 }
2882                 sdata_info(sdata, "associated\n");
2883
2884                 /*
2885                  * destroy assoc_data afterwards, as otherwise an idle
2886                  * recalc after assoc_data is NULL but before associated
2887                  * is set can cause the interface to go idle
2888                  */
2889                 ieee80211_destroy_assoc_data(sdata, true);
2890
2891                 /* get uapsd queues configuration */
2892                 uapsd_queues = 0;
2893                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2894                         if (sdata->tx_conf[ac].uapsd)
2895                                 uapsd_queues |= BIT(ac);
2896         }
2897
2898         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
2899 }
2900
2901 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2902                                   struct ieee80211_mgmt *mgmt, size_t len,
2903                                   struct ieee80211_rx_status *rx_status,
2904                                   struct ieee802_11_elems *elems)
2905 {
2906         struct ieee80211_local *local = sdata->local;
2907         struct ieee80211_bss *bss;
2908         struct ieee80211_channel *channel;
2909
2910         sdata_assert_lock(sdata);
2911
2912         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
2913         if (!channel)
2914                 return;
2915
2916         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2917                                         channel);
2918         if (bss) {
2919                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
2920                 ieee80211_rx_bss_put(local, bss);
2921         }
2922 }
2923
2924
2925 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2926                                          struct sk_buff *skb)
2927 {
2928         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2929         struct ieee80211_if_managed *ifmgd;
2930         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2931         size_t baselen, len = skb->len;
2932         struct ieee802_11_elems elems;
2933
2934         ifmgd = &sdata->u.mgd;
2935
2936         sdata_assert_lock(sdata);
2937
2938         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2939                 return; /* ignore ProbeResp to foreign address */
2940
2941         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2942         if (baselen > len)
2943                 return;
2944
2945         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2946                                false, &elems);
2947
2948         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2949
2950         if (ifmgd->associated &&
2951             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2952                 ieee80211_reset_ap_probe(sdata);
2953
2954         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2955             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2956                 /* got probe response, continue with auth */
2957                 sdata_info(sdata, "direct probe responded\n");
2958                 ifmgd->auth_data->tries = 0;
2959                 ifmgd->auth_data->timeout = jiffies;
2960                 ifmgd->auth_data->timeout_started = true;
2961                 run_again(sdata, ifmgd->auth_data->timeout);
2962         }
2963 }
2964
2965 /*
2966  * This is the canonical list of information elements we care about,
2967  * the filter code also gives us all changes to the Microsoft OUI
2968  * (00:50:F2) vendor IE which is used for WMM which we need to track,
2969  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
2970  * changes to requested client power.
2971  *
2972  * We implement beacon filtering in software since that means we can
2973  * avoid processing the frame here and in cfg80211, and userspace
2974  * will not be able to tell whether the hardware supports it or not.
2975  *
2976  * XXX: This list needs to be dynamic -- userspace needs to be able to
2977  *      add items it requires. It also needs to be able to tell us to
2978  *      look out for other vendor IEs.
2979  */
2980 static const u64 care_about_ies =
2981         (1ULL << WLAN_EID_COUNTRY) |
2982         (1ULL << WLAN_EID_ERP_INFO) |
2983         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2984         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2985         (1ULL << WLAN_EID_HT_CAPABILITY) |
2986         (1ULL << WLAN_EID_HT_OPERATION);
2987
2988 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2989                                      struct ieee80211_mgmt *mgmt, size_t len,
2990                                      struct ieee80211_rx_status *rx_status)
2991 {
2992         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2993         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2994         size_t baselen;
2995         struct ieee802_11_elems elems;
2996         struct ieee80211_local *local = sdata->local;
2997         struct ieee80211_chanctx_conf *chanctx_conf;
2998         struct ieee80211_channel *chan;
2999         struct sta_info *sta;
3000         u32 changed = 0;
3001         bool erp_valid;
3002         u8 erp_value = 0;
3003         u32 ncrc;
3004         u8 *bssid;
3005         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3006
3007         sdata_assert_lock(sdata);
3008
3009         /* Process beacon from the current BSS */
3010         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3011         if (baselen > len)
3012                 return;
3013
3014         rcu_read_lock();
3015         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3016         if (!chanctx_conf) {
3017                 rcu_read_unlock();
3018                 return;
3019         }
3020
3021         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3022                 rcu_read_unlock();
3023                 return;
3024         }
3025         chan = chanctx_conf->def.chan;
3026         rcu_read_unlock();
3027
3028         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3029             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3030                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3031                                        len - baselen, false, &elems);
3032
3033                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3034                 if (elems.tim && !elems.parse_error) {
3035                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3036                         ifmgd->dtim_period = tim_ie->dtim_period;
3037                 }
3038                 ifmgd->have_beacon = true;
3039                 ifmgd->assoc_data->need_beacon = false;
3040                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3041                         sdata->vif.bss_conf.sync_tsf =
3042                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3043                         sdata->vif.bss_conf.sync_device_ts =
3044                                 rx_status->device_timestamp;
3045                         if (elems.tim)
3046                                 sdata->vif.bss_conf.sync_dtim_count =
3047                                         elems.tim->dtim_count;
3048                         else
3049                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3050                 }
3051                 /* continue assoc process */
3052                 ifmgd->assoc_data->timeout = jiffies;
3053                 ifmgd->assoc_data->timeout_started = true;
3054                 run_again(sdata, ifmgd->assoc_data->timeout);
3055                 return;
3056         }
3057
3058         if (!ifmgd->associated ||
3059             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3060                 return;
3061         bssid = ifmgd->associated->bssid;
3062
3063         /* Track average RSSI from the Beacon frames of the current AP */
3064         ifmgd->last_beacon_signal = rx_status->signal;
3065         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3066                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3067                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3068                 ifmgd->last_cqm_event_signal = 0;
3069                 ifmgd->count_beacon_signal = 1;
3070                 ifmgd->last_ave_beacon_signal = 0;
3071         } else {
3072                 ifmgd->ave_beacon_signal =
3073                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3074                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3075                          ifmgd->ave_beacon_signal) / 16;
3076                 ifmgd->count_beacon_signal++;
3077         }
3078
3079         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3080             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3081                 int sig = ifmgd->ave_beacon_signal;
3082                 int last_sig = ifmgd->last_ave_beacon_signal;
3083
3084                 /*
3085                  * if signal crosses either of the boundaries, invoke callback
3086                  * with appropriate parameters
3087                  */
3088                 if (sig > ifmgd->rssi_max_thold &&
3089                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3090                         ifmgd->last_ave_beacon_signal = sig;
3091                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3092                 } else if (sig < ifmgd->rssi_min_thold &&
3093                            (last_sig >= ifmgd->rssi_max_thold ||
3094                            last_sig == 0)) {
3095                         ifmgd->last_ave_beacon_signal = sig;
3096                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3097                 }
3098         }
3099
3100         if (bss_conf->cqm_rssi_thold &&
3101             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3102             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3103                 int sig = ifmgd->ave_beacon_signal / 16;
3104                 int last_event = ifmgd->last_cqm_event_signal;
3105                 int thold = bss_conf->cqm_rssi_thold;
3106                 int hyst = bss_conf->cqm_rssi_hyst;
3107                 if (sig < thold &&
3108                     (last_event == 0 || sig < last_event - hyst)) {
3109                         ifmgd->last_cqm_event_signal = sig;
3110                         ieee80211_cqm_rssi_notify(
3111                                 &sdata->vif,
3112                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3113                                 GFP_KERNEL);
3114                 } else if (sig > thold &&
3115                            (last_event == 0 || sig > last_event + hyst)) {
3116                         ifmgd->last_cqm_event_signal = sig;
3117                         ieee80211_cqm_rssi_notify(
3118                                 &sdata->vif,
3119                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3120                                 GFP_KERNEL);
3121                 }
3122         }
3123
3124         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3125                 mlme_dbg_ratelimited(sdata,
3126                                      "cancelling AP probe due to a received beacon\n");
3127                 ieee80211_reset_ap_probe(sdata);
3128         }
3129
3130         /*
3131          * Push the beacon loss detection into the future since
3132          * we are processing a beacon from the AP just now.
3133          */
3134         ieee80211_sta_reset_beacon_monitor(sdata);
3135
3136         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3137         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3138                                           len - baselen, false, &elems,
3139                                           care_about_ies, ncrc);
3140
3141         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3142                 bool directed_tim = ieee80211_check_tim(elems.tim,
3143                                                         elems.tim_len,
3144                                                         ifmgd->aid);
3145                 if (directed_tim) {
3146                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3147                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3148                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3149                                         ieee80211_hw_config(local,
3150                                                             IEEE80211_CONF_CHANGE_PS);
3151                                 }
3152                                 ieee80211_send_nullfunc(local, sdata, 0);
3153                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3154                                 local->pspolling = true;
3155
3156                                 /*
3157                                  * Here is assumed that the driver will be
3158                                  * able to send ps-poll frame and receive a
3159                                  * response even though power save mode is
3160                                  * enabled, but some drivers might require
3161                                  * to disable power save here. This needs
3162                                  * to be investigated.
3163                                  */
3164                                 ieee80211_send_pspoll(local, sdata);
3165                         }
3166                 }
3167         }
3168
3169         if (sdata->vif.p2p) {
3170                 struct ieee80211_p2p_noa_attr noa = {};
3171                 int ret;
3172
3173                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3174                                             len - baselen,
3175                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3176                                             (u8 *) &noa, sizeof(noa));
3177                 if (ret >= 2) {
3178                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3179                                 /* valid noa_attr and index changed */
3180                                 sdata->u.mgd.p2p_noa_index = noa.index;
3181                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3182                                 changed |= BSS_CHANGED_P2P_PS;
3183                                 /*
3184                                  * make sure we update all information, the CRC
3185                                  * mechanism doesn't look at P2P attributes.
3186                                  */
3187                                 ifmgd->beacon_crc_valid = false;
3188                         }
3189                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3190                         /* noa_attr not found and we had valid noa_attr before */
3191                         sdata->u.mgd.p2p_noa_index = -1;
3192                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3193                         changed |= BSS_CHANGED_P2P_PS;
3194                         ifmgd->beacon_crc_valid = false;
3195                 }
3196         }
3197
3198         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3199                 return;
3200         ifmgd->beacon_crc = ncrc;
3201         ifmgd->beacon_crc_valid = true;
3202
3203         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3204
3205         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3206                                          &elems, true);
3207
3208         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3209             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3210                                      elems.wmm_param_len))
3211                 changed |= BSS_CHANGED_QOS;
3212
3213         /*
3214          * If we haven't had a beacon before, tell the driver about the
3215          * DTIM period (and beacon timing if desired) now.
3216          */
3217         if (!ifmgd->have_beacon) {
3218                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3219                 if (elems.tim)
3220                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3221                 else
3222                         bss_conf->dtim_period = 1;
3223
3224                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3225                         sdata->vif.bss_conf.sync_tsf =
3226                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3227                         sdata->vif.bss_conf.sync_device_ts =
3228                                 rx_status->device_timestamp;
3229                         if (elems.tim)
3230                                 sdata->vif.bss_conf.sync_dtim_count =
3231                                         elems.tim->dtim_count;
3232                         else
3233                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3234                 }
3235
3236                 changed |= BSS_CHANGED_BEACON_INFO;
3237                 ifmgd->have_beacon = true;
3238
3239                 mutex_lock(&local->iflist_mtx);
3240                 ieee80211_recalc_ps(local, -1);
3241                 mutex_unlock(&local->iflist_mtx);
3242
3243                 ieee80211_recalc_ps_vif(sdata);
3244         }
3245
3246         if (elems.erp_info) {
3247                 erp_valid = true;
3248                 erp_value = elems.erp_info[0];
3249         } else {
3250                 erp_valid = false;
3251         }
3252         changed |= ieee80211_handle_bss_capability(sdata,
3253                         le16_to_cpu(mgmt->u.beacon.capab_info),
3254                         erp_valid, erp_value);
3255
3256         mutex_lock(&local->sta_mtx);
3257         sta = sta_info_get(sdata, bssid);
3258
3259         if (ieee80211_config_bw(sdata, sta,
3260                                 elems.ht_cap_elem, elems.ht_operation,
3261                                 elems.vht_operation, bssid, &changed)) {
3262                 mutex_unlock(&local->sta_mtx);
3263                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3264                                        WLAN_REASON_DEAUTH_LEAVING,
3265                                        true, deauth_buf);
3266                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3267                                       sizeof(deauth_buf));
3268                 return;
3269         }
3270
3271         if (sta && elems.opmode_notif)
3272                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3273                                             rx_status->band, true);
3274         mutex_unlock(&local->sta_mtx);
3275
3276         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3277                                                elems.country_elem,
3278                                                elems.country_elem_len,
3279                                                elems.pwr_constr_elem,
3280                                                elems.cisco_dtpc_elem);
3281
3282         ieee80211_bss_info_change_notify(sdata, changed);
3283 }
3284
3285 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3286                                   struct sk_buff *skb)
3287 {
3288         struct ieee80211_rx_status *rx_status;
3289         struct ieee80211_mgmt *mgmt;
3290         u16 fc;
3291         struct ieee802_11_elems elems;
3292         int ies_len;
3293
3294         rx_status = (struct ieee80211_rx_status *) skb->cb;
3295         mgmt = (struct ieee80211_mgmt *) skb->data;
3296         fc = le16_to_cpu(mgmt->frame_control);
3297
3298         sdata_lock(sdata);
3299
3300         switch (fc & IEEE80211_FCTL_STYPE) {
3301         case IEEE80211_STYPE_BEACON:
3302                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3303                 break;
3304         case IEEE80211_STYPE_PROBE_RESP:
3305                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3306                 break;
3307         case IEEE80211_STYPE_AUTH:
3308                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3309                 break;
3310         case IEEE80211_STYPE_DEAUTH:
3311                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3312                 break;
3313         case IEEE80211_STYPE_DISASSOC:
3314                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3315                 break;
3316         case IEEE80211_STYPE_ASSOC_RESP:
3317         case IEEE80211_STYPE_REASSOC_RESP:
3318                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3319                 break;
3320         case IEEE80211_STYPE_ACTION:
3321                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3322                         ies_len = skb->len -
3323                                   offsetof(struct ieee80211_mgmt,
3324                                            u.action.u.chan_switch.variable);
3325
3326                         if (ies_len < 0)
3327                                 break;
3328
3329                         ieee802_11_parse_elems(
3330                                 mgmt->u.action.u.chan_switch.variable,
3331                                 ies_len, true, &elems);
3332
3333                         if (elems.parse_error)
3334                                 break;
3335
3336                         ieee80211_sta_process_chanswitch(sdata,
3337                                                          rx_status->mactime,
3338                                                          &elems, false);
3339                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3340                         ies_len = skb->len -
3341                                   offsetof(struct ieee80211_mgmt,
3342                                            u.action.u.ext_chan_switch.variable);
3343
3344                         if (ies_len < 0)
3345                                 break;
3346
3347                         ieee802_11_parse_elems(
3348                                 mgmt->u.action.u.ext_chan_switch.variable,
3349                                 ies_len, true, &elems);
3350
3351                         if (elems.parse_error)
3352                                 break;
3353
3354                         /* for the handling code pretend this was also an IE */
3355                         elems.ext_chansw_ie =
3356                                 &mgmt->u.action.u.ext_chan_switch.data;
3357
3358                         ieee80211_sta_process_chanswitch(sdata,
3359                                                          rx_status->mactime,
3360                                                          &elems, false);
3361                 }
3362                 break;
3363         }
3364         sdata_unlock(sdata);
3365 }
3366
3367 static void ieee80211_sta_timer(unsigned long data)
3368 {
3369         struct ieee80211_sub_if_data *sdata =
3370                 (struct ieee80211_sub_if_data *) data;
3371
3372         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3373 }
3374
3375 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3376                                           u8 *bssid, u8 reason, bool tx)
3377 {
3378         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3379
3380         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3381                                tx, frame_buf);
3382
3383         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3384                               IEEE80211_DEAUTH_FRAME_LEN);
3385 }
3386
3387 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3388 {
3389         struct ieee80211_local *local = sdata->local;
3390         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3391         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3392         u32 tx_flags = 0;
3393
3394         sdata_assert_lock(sdata);
3395
3396         if (WARN_ON_ONCE(!auth_data))
3397                 return -EINVAL;
3398
3399         auth_data->tries++;
3400
3401         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3402                 sdata_info(sdata, "authentication with %pM timed out\n",
3403                            auth_data->bss->bssid);
3404
3405                 /*
3406                  * Most likely AP is not in the range so remove the
3407                  * bss struct for that AP.
3408                  */
3409                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3410
3411                 return -ETIMEDOUT;
3412         }
3413
3414         drv_mgd_prepare_tx(local, sdata);
3415
3416         if (auth_data->bss->proberesp_ies) {
3417                 u16 trans = 1;
3418                 u16 status = 0;
3419
3420                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3421                            auth_data->bss->bssid, auth_data->tries,
3422                            IEEE80211_AUTH_MAX_TRIES);
3423
3424                 auth_data->expected_transaction = 2;
3425
3426                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3427                         trans = auth_data->sae_trans;
3428                         status = auth_data->sae_status;
3429                         auth_data->expected_transaction = trans;
3430                 }
3431
3432                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3433                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3434                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3435
3436                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3437                                     auth_data->data, auth_data->data_len,
3438                                     auth_data->bss->bssid,
3439                                     auth_data->bss->bssid, NULL, 0, 0,
3440                                     tx_flags);
3441         } else {
3442                 const u8 *ssidie;
3443
3444                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3445                            auth_data->bss->bssid, auth_data->tries,
3446                            IEEE80211_AUTH_MAX_TRIES);
3447
3448                 rcu_read_lock();
3449                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3450                 if (!ssidie) {
3451                         rcu_read_unlock();
3452                         return -EINVAL;
3453                 }
3454                 /*
3455                  * Direct probe is sent to broadcast address as some APs
3456                  * will not answer to direct packet in unassociated state.
3457                  */
3458                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
3459                                          NULL, 0, (u32) -1, true, 0,
3460                                          auth_data->bss->channel, false);
3461                 rcu_read_unlock();
3462         }
3463
3464         if (tx_flags == 0) {
3465                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3466                 auth_data->timeout_started = true;
3467                 run_again(sdata, auth_data->timeout);
3468         } else {
3469                 auth_data->timeout =
3470                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3471                 auth_data->timeout_started = true;
3472                 run_again(sdata, auth_data->timeout);
3473         }
3474
3475         return 0;
3476 }
3477
3478 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3479 {
3480         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3481         struct ieee80211_local *local = sdata->local;
3482
3483         sdata_assert_lock(sdata);
3484
3485         assoc_data->tries++;
3486         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3487                 sdata_info(sdata, "association with %pM timed out\n",
3488                            assoc_data->bss->bssid);
3489
3490                 /*
3491                  * Most likely AP is not in the range so remove the
3492                  * bss struct for that AP.
3493                  */
3494                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3495
3496                 return -ETIMEDOUT;
3497         }
3498
3499         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3500                    assoc_data->bss->bssid, assoc_data->tries,
3501                    IEEE80211_ASSOC_MAX_TRIES);
3502         ieee80211_send_assoc(sdata);
3503
3504         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3505                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3506                 assoc_data->timeout_started = true;
3507                 run_again(sdata, assoc_data->timeout);
3508         } else {
3509                 assoc_data->timeout =
3510                         round_jiffies_up(jiffies +
3511                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3512                 assoc_data->timeout_started = true;
3513                 run_again(sdata, assoc_data->timeout);
3514         }
3515
3516         return 0;
3517 }
3518
3519 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3520                                   __le16 fc, bool acked)
3521 {
3522         struct ieee80211_local *local = sdata->local;
3523
3524         sdata->u.mgd.status_fc = fc;
3525         sdata->u.mgd.status_acked = acked;
3526         sdata->u.mgd.status_received = true;
3527
3528         ieee80211_queue_work(&local->hw, &sdata->work);
3529 }
3530
3531 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3532 {
3533         struct ieee80211_local *local = sdata->local;
3534         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3535
3536         sdata_lock(sdata);
3537
3538         if (ifmgd->status_received) {
3539                 __le16 fc = ifmgd->status_fc;
3540                 bool status_acked = ifmgd->status_acked;
3541
3542                 ifmgd->status_received = false;
3543                 if (ifmgd->auth_data &&
3544                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3545                         if (status_acked) {
3546                                 ifmgd->auth_data->timeout =
3547                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3548                                 run_again(sdata, ifmgd->auth_data->timeout);
3549                         } else {
3550                                 ifmgd->auth_data->timeout = jiffies - 1;
3551                         }
3552                         ifmgd->auth_data->timeout_started = true;
3553                 } else if (ifmgd->assoc_data &&
3554                            (ieee80211_is_assoc_req(fc) ||
3555                             ieee80211_is_reassoc_req(fc))) {
3556                         if (status_acked) {
3557                                 ifmgd->assoc_data->timeout =
3558                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3559                                 run_again(sdata, ifmgd->assoc_data->timeout);
3560                         } else {
3561                                 ifmgd->assoc_data->timeout = jiffies - 1;
3562                         }
3563                         ifmgd->assoc_data->timeout_started = true;
3564                 }
3565         }
3566
3567         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3568             time_after(jiffies, ifmgd->auth_data->timeout)) {
3569                 if (ifmgd->auth_data->done) {
3570                         /*
3571                          * ok ... we waited for assoc but userspace didn't,
3572                          * so let's just kill the auth data
3573                          */
3574                         ieee80211_destroy_auth_data(sdata, false);
3575                 } else if (ieee80211_probe_auth(sdata)) {
3576                         u8 bssid[ETH_ALEN];
3577
3578                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3579
3580                         ieee80211_destroy_auth_data(sdata, false);
3581
3582                         cfg80211_auth_timeout(sdata->dev, bssid);
3583                 }
3584         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3585                 run_again(sdata, ifmgd->auth_data->timeout);
3586
3587         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3588             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3589                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3590                     ieee80211_do_assoc(sdata)) {
3591                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3592
3593                         ieee80211_destroy_assoc_data(sdata, false);
3594                         cfg80211_assoc_timeout(sdata->dev, bss);
3595                 }
3596         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3597                 run_again(sdata, ifmgd->assoc_data->timeout);
3598
3599         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3600             ifmgd->associated) {
3601                 u8 bssid[ETH_ALEN];
3602                 int max_tries;
3603
3604                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3605
3606                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3607                         max_tries = max_nullfunc_tries;
3608                 else
3609                         max_tries = max_probe_tries;
3610
3611                 /* ACK received for nullfunc probing frame */
3612                 if (!ifmgd->probe_send_count)
3613                         ieee80211_reset_ap_probe(sdata);
3614                 else if (ifmgd->nullfunc_failed) {
3615                         if (ifmgd->probe_send_count < max_tries) {
3616                                 mlme_dbg(sdata,
3617                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3618                                          bssid, ifmgd->probe_send_count,
3619                                          max_tries);
3620                                 ieee80211_mgd_probe_ap_send(sdata);
3621                         } else {
3622                                 mlme_dbg(sdata,
3623                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3624                                          bssid);
3625                                 ieee80211_sta_connection_lost(sdata, bssid,
3626                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3627                                         false);
3628                         }
3629                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3630                         run_again(sdata, ifmgd->probe_timeout);
3631                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3632                         mlme_dbg(sdata,
3633                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3634                                  bssid, probe_wait_ms);
3635                         ieee80211_sta_connection_lost(sdata, bssid,
3636                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3637                 } else if (ifmgd->probe_send_count < max_tries) {
3638                         mlme_dbg(sdata,
3639                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3640                                  bssid, probe_wait_ms,
3641                                  ifmgd->probe_send_count, max_tries);
3642                         ieee80211_mgd_probe_ap_send(sdata);
3643                 } else {
3644                         /*
3645                          * We actually lost the connection ... or did we?
3646                          * Let's make sure!
3647                          */
3648                         wiphy_debug(local->hw.wiphy,
3649                                     "%s: No probe response from AP %pM"
3650                                     " after %dms, disconnecting.\n",
3651                                     sdata->name,
3652                                     bssid, probe_wait_ms);
3653
3654                         ieee80211_sta_connection_lost(sdata, bssid,
3655                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3656                 }
3657         }
3658
3659         sdata_unlock(sdata);
3660 }
3661
3662 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3663 {
3664         struct ieee80211_sub_if_data *sdata =
3665                 (struct ieee80211_sub_if_data *) data;
3666         struct ieee80211_local *local = sdata->local;
3667
3668         if (local->quiescing)
3669                 return;
3670
3671         if (sdata->vif.csa_active)
3672                 return;
3673
3674         sdata->u.mgd.connection_loss = false;
3675         ieee80211_queue_work(&sdata->local->hw,
3676                              &sdata->u.mgd.beacon_connection_loss_work);
3677 }
3678
3679 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3680 {
3681         struct ieee80211_sub_if_data *sdata =
3682                 (struct ieee80211_sub_if_data *) data;
3683         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3684         struct ieee80211_local *local = sdata->local;
3685
3686         if (local->quiescing)
3687                 return;
3688
3689         if (sdata->vif.csa_active)
3690                 return;
3691
3692         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3693 }
3694
3695 static void ieee80211_sta_monitor_work(struct work_struct *work)
3696 {
3697         struct ieee80211_sub_if_data *sdata =
3698                 container_of(work, struct ieee80211_sub_if_data,
3699                              u.mgd.monitor_work);
3700
3701         ieee80211_mgd_probe_ap(sdata, false);
3702 }
3703
3704 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3705 {
3706         u32 flags;
3707
3708         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3709                 __ieee80211_stop_poll(sdata);
3710
3711                 /* let's probe the connection once */
3712                 flags = sdata->local->hw.flags;
3713                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3714                         ieee80211_queue_work(&sdata->local->hw,
3715                                              &sdata->u.mgd.monitor_work);
3716                 /* and do all the other regular work too */
3717                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3718         }
3719 }
3720
3721 #ifdef CONFIG_PM
3722 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3723 {
3724         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3725         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3726
3727         sdata_lock(sdata);
3728
3729         if (ifmgd->auth_data || ifmgd->assoc_data) {
3730                 const u8 *bssid = ifmgd->auth_data ?
3731                                 ifmgd->auth_data->bss->bssid :
3732                                 ifmgd->assoc_data->bss->bssid;
3733
3734                 /*
3735                  * If we are trying to authenticate / associate while suspending,
3736                  * cfg80211 won't know and won't actually abort those attempts,
3737                  * thus we need to do that ourselves.
3738                  */
3739                 ieee80211_send_deauth_disassoc(sdata, bssid,
3740                                                IEEE80211_STYPE_DEAUTH,
3741                                                WLAN_REASON_DEAUTH_LEAVING,
3742                                                false, frame_buf);
3743                 if (ifmgd->assoc_data)
3744                         ieee80211_destroy_assoc_data(sdata, false);
3745                 if (ifmgd->auth_data)
3746                         ieee80211_destroy_auth_data(sdata, false);
3747                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3748                                       IEEE80211_DEAUTH_FRAME_LEN);
3749         }
3750
3751         sdata_unlock(sdata);
3752 }
3753
3754 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3755 {
3756         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3757
3758         sdata_lock(sdata);
3759         if (!ifmgd->associated) {
3760                 sdata_unlock(sdata);
3761                 return;
3762         }
3763
3764         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3765                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3766                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3767                 ieee80211_sta_connection_lost(sdata,
3768                                               ifmgd->associated->bssid,
3769                                               WLAN_REASON_UNSPECIFIED,
3770                                               true);
3771                 sdata_unlock(sdata);
3772                 return;
3773         }
3774         sdata_unlock(sdata);
3775 }
3776 #endif
3777
3778 /* interface setup */
3779 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3780 {
3781         struct ieee80211_if_managed *ifmgd;
3782
3783         ifmgd = &sdata->u.mgd;
3784         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3785         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3786         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3787                   ieee80211_beacon_connection_loss_work);
3788         INIT_WORK(&ifmgd->csa_connection_drop_work,
3789                   ieee80211_csa_connection_drop_work);
3790         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3791         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
3792                           ieee80211_tdls_peer_del_work);
3793         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3794                     (unsigned long) sdata);
3795         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3796                     (unsigned long) sdata);
3797         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3798                     (unsigned long) sdata);
3799         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3800                     (unsigned long) sdata);
3801
3802         ifmgd->flags = 0;
3803         ifmgd->powersave = sdata->wdev.ps;
3804         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
3805         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
3806         ifmgd->p2p_noa_index = -1;
3807
3808         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
3809                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3810         else
3811                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3812 }
3813
3814 /* scan finished notification */
3815 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3816 {
3817         struct ieee80211_sub_if_data *sdata;
3818
3819         /* Restart STA timers */
3820         rcu_read_lock();
3821         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3822                 if (ieee80211_sdata_running(sdata))
3823                         ieee80211_restart_sta_timer(sdata);
3824         }
3825         rcu_read_unlock();
3826 }
3827
3828 int ieee80211_max_network_latency(struct notifier_block *nb,
3829                                   unsigned long data, void *dummy)
3830 {
3831         s32 latency_usec = (s32) data;
3832         struct ieee80211_local *local =
3833                 container_of(nb, struct ieee80211_local,
3834                              network_latency_notifier);
3835
3836         mutex_lock(&local->iflist_mtx);
3837         ieee80211_recalc_ps(local, latency_usec);
3838         mutex_unlock(&local->iflist_mtx);
3839
3840         return NOTIFY_OK;
3841 }
3842
3843 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3844                                      struct cfg80211_bss *cbss)
3845 {
3846         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3847         const u8 *ht_cap_ie, *vht_cap_ie;
3848         const struct ieee80211_ht_cap *ht_cap;
3849         const struct ieee80211_vht_cap *vht_cap;
3850         u8 chains = 1;
3851
3852         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3853                 return chains;
3854
3855         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3856         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3857                 ht_cap = (void *)(ht_cap_ie + 2);
3858                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3859                 /*
3860                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3861                  *       "Tx Unequal Modulation Supported" fields.
3862                  */
3863         }
3864
3865         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3866                 return chains;
3867
3868         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3869         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3870                 u8 nss;
3871                 u16 tx_mcs_map;
3872
3873                 vht_cap = (void *)(vht_cap_ie + 2);
3874                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3875                 for (nss = 8; nss > 0; nss--) {
3876                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3877                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3878                                 break;
3879                 }
3880                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3881                 chains = max(chains, nss);
3882         }
3883
3884         return chains;
3885 }
3886
3887 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3888                                   struct cfg80211_bss *cbss)
3889 {
3890         struct ieee80211_local *local = sdata->local;
3891         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3892         const struct ieee80211_ht_cap *ht_cap = NULL;
3893         const struct ieee80211_ht_operation *ht_oper = NULL;
3894         const struct ieee80211_vht_operation *vht_oper = NULL;
3895         struct ieee80211_supported_band *sband;
3896         struct cfg80211_chan_def chandef;
3897         int ret;
3898
3899         sband = local->hw.wiphy->bands[cbss->channel->band];
3900
3901         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3902                           IEEE80211_STA_DISABLE_80P80MHZ |
3903                           IEEE80211_STA_DISABLE_160MHZ);
3904
3905         rcu_read_lock();
3906
3907         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3908             sband->ht_cap.ht_supported) {
3909                 const u8 *ht_oper_ie, *ht_cap_ie;
3910
3911                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3912                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3913                         ht_oper = (void *)(ht_oper_ie + 2);
3914
3915                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3916                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
3917                         ht_cap = (void *)(ht_cap_ie + 2);
3918
3919                 if (!ht_cap) {
3920                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3921                         ht_oper = NULL;
3922                 }
3923         }
3924
3925         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3926             sband->vht_cap.vht_supported) {
3927                 const u8 *vht_oper_ie, *vht_cap;
3928
3929                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3930                                                    WLAN_EID_VHT_OPERATION);
3931                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3932                         vht_oper = (void *)(vht_oper_ie + 2);
3933                 if (vht_oper && !ht_oper) {
3934                         vht_oper = NULL;
3935                         sdata_info(sdata,
3936                                    "AP advertised VHT without HT, disabling both\n");
3937                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3938                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3939                 }
3940
3941                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3942                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
3943                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3944                         vht_oper = NULL;
3945                 }
3946         }
3947
3948         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3949                                                      cbss->channel,
3950                                                      ht_cap, ht_oper, vht_oper,
3951                                                      &chandef, false);
3952
3953         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3954                                       local->rx_chains);
3955
3956         rcu_read_unlock();
3957
3958         /* will change later if needed */
3959         sdata->smps_mode = IEEE80211_SMPS_OFF;
3960
3961         mutex_lock(&local->mtx);
3962         /*
3963          * If this fails (possibly due to channel context sharing
3964          * on incompatible channels, e.g. 80+80 and 160 sharing the
3965          * same control channel) try to use a smaller bandwidth.
3966          */
3967         ret = ieee80211_vif_use_channel(sdata, &chandef,
3968                                         IEEE80211_CHANCTX_SHARED);
3969
3970         /* don't downgrade for 5 and 10 MHz channels, though. */
3971         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
3972             chandef.width == NL80211_CHAN_WIDTH_10)
3973                 goto out;
3974
3975         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3976                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3977                 ret = ieee80211_vif_use_channel(sdata, &chandef,
3978                                                 IEEE80211_CHANCTX_SHARED);
3979         }
3980  out:
3981         mutex_unlock(&local->mtx);
3982         return ret;
3983 }
3984
3985 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3986                                      struct cfg80211_bss *cbss, bool assoc)
3987 {
3988         struct ieee80211_local *local = sdata->local;
3989         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3990         struct ieee80211_bss *bss = (void *)cbss->priv;
3991         struct sta_info *new_sta = NULL;
3992         bool have_sta = false;
3993         int err;
3994
3995         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3996                 return -EINVAL;
3997
3998         if (assoc) {
3999                 rcu_read_lock();
4000                 have_sta = sta_info_get(sdata, cbss->bssid);
4001                 rcu_read_unlock();
4002         }
4003
4004         if (!have_sta) {
4005                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4006                 if (!new_sta)
4007                         return -ENOMEM;
4008         }
4009         if (new_sta) {
4010                 u32 rates = 0, basic_rates = 0;
4011                 bool have_higher_than_11mbit;
4012                 int min_rate = INT_MAX, min_rate_index = -1;
4013                 struct ieee80211_chanctx_conf *chanctx_conf;
4014                 struct ieee80211_supported_band *sband;
4015                 const struct cfg80211_bss_ies *ies;
4016                 int shift;
4017                 u32 rate_flags;
4018
4019                 sband = local->hw.wiphy->bands[cbss->channel->band];
4020
4021                 err = ieee80211_prep_channel(sdata, cbss);
4022                 if (err) {
4023                         sta_info_free(local, new_sta);
4024                         return -EINVAL;
4025                 }
4026                 shift = ieee80211_vif_get_shift(&sdata->vif);
4027
4028                 rcu_read_lock();
4029                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4030                 if (WARN_ON(!chanctx_conf)) {
4031                         rcu_read_unlock();
4032                         sta_info_free(local, new_sta);
4033                         return -EINVAL;
4034                 }
4035                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4036                 rcu_read_unlock();
4037
4038                 ieee80211_get_rates(sband, bss->supp_rates,
4039                                     bss->supp_rates_len,
4040                                     &rates, &basic_rates,
4041                                     &have_higher_than_11mbit,
4042                                     &min_rate, &min_rate_index,
4043                                     shift, rate_flags);
4044
4045                 /*
4046                  * This used to be a workaround for basic rates missing
4047                  * in the association response frame. Now that we no
4048                  * longer use the basic rates from there, it probably
4049                  * doesn't happen any more, but keep the workaround so
4050                  * in case some *other* APs are buggy in different ways
4051                  * we can connect -- with a warning.
4052                  */
4053                 if (!basic_rates && min_rate_index >= 0) {
4054                         sdata_info(sdata,
4055                                    "No basic rates, using min rate instead\n");
4056                         basic_rates = BIT(min_rate_index);
4057                 }
4058
4059                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4060                 sdata->vif.bss_conf.basic_rates = basic_rates;
4061
4062                 /* cf. IEEE 802.11 9.2.12 */
4063                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4064                     have_higher_than_11mbit)
4065                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4066                 else
4067                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4068
4069                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4070
4071                 /* set timing information */
4072                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4073                 rcu_read_lock();
4074                 ies = rcu_dereference(cbss->beacon_ies);
4075                 if (ies) {
4076                         const u8 *tim_ie;
4077
4078                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4079                         sdata->vif.bss_conf.sync_device_ts =
4080                                 bss->device_ts_beacon;
4081                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4082                                                   ies->data, ies->len);
4083                         if (tim_ie && tim_ie[1] >= 2)
4084                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4085                         else
4086                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4087                 } else if (!(local->hw.flags &
4088                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4089                         ies = rcu_dereference(cbss->proberesp_ies);
4090                         /* must be non-NULL since beacon IEs were NULL */
4091                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4092                         sdata->vif.bss_conf.sync_device_ts =
4093                                 bss->device_ts_presp;
4094                         sdata->vif.bss_conf.sync_dtim_count = 0;
4095                 } else {
4096                         sdata->vif.bss_conf.sync_tsf = 0;
4097                         sdata->vif.bss_conf.sync_device_ts = 0;
4098                         sdata->vif.bss_conf.sync_dtim_count = 0;
4099                 }
4100                 rcu_read_unlock();
4101
4102                 /* tell driver about BSSID, basic rates and timing */
4103                 ieee80211_bss_info_change_notify(sdata,
4104                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4105                         BSS_CHANGED_BEACON_INT);
4106
4107                 if (assoc)
4108                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4109
4110                 err = sta_info_insert(new_sta);
4111                 new_sta = NULL;
4112                 if (err) {
4113                         sdata_info(sdata,
4114                                    "failed to insert STA entry for the AP (error %d)\n",
4115                                    err);
4116                         return err;
4117                 }
4118         } else
4119                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4120
4121         return 0;
4122 }
4123
4124 /* config hooks */
4125 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4126                        struct cfg80211_auth_request *req)
4127 {
4128         struct ieee80211_local *local = sdata->local;
4129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4130         struct ieee80211_mgd_auth_data *auth_data;
4131         u16 auth_alg;
4132         int err;
4133
4134         /* prepare auth data structure */
4135
4136         switch (req->auth_type) {
4137         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4138                 auth_alg = WLAN_AUTH_OPEN;
4139                 break;
4140         case NL80211_AUTHTYPE_SHARED_KEY:
4141                 if (IS_ERR(local->wep_tx_tfm))
4142                         return -EOPNOTSUPP;
4143                 auth_alg = WLAN_AUTH_SHARED_KEY;
4144                 break;
4145         case NL80211_AUTHTYPE_FT:
4146                 auth_alg = WLAN_AUTH_FT;
4147                 break;
4148         case NL80211_AUTHTYPE_NETWORK_EAP:
4149                 auth_alg = WLAN_AUTH_LEAP;
4150                 break;
4151         case NL80211_AUTHTYPE_SAE:
4152                 auth_alg = WLAN_AUTH_SAE;
4153                 break;
4154         default:
4155                 return -EOPNOTSUPP;
4156         }
4157
4158         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4159                             req->ie_len, GFP_KERNEL);
4160         if (!auth_data)
4161                 return -ENOMEM;
4162
4163         auth_data->bss = req->bss;
4164
4165         if (req->sae_data_len >= 4) {
4166                 __le16 *pos = (__le16 *) req->sae_data;
4167                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4168                 auth_data->sae_status = le16_to_cpu(pos[1]);
4169                 memcpy(auth_data->data, req->sae_data + 4,
4170                        req->sae_data_len - 4);
4171                 auth_data->data_len += req->sae_data_len - 4;
4172         }
4173
4174         if (req->ie && req->ie_len) {
4175                 memcpy(&auth_data->data[auth_data->data_len],
4176                        req->ie, req->ie_len);
4177                 auth_data->data_len += req->ie_len;
4178         }
4179
4180         if (req->key && req->key_len) {
4181                 auth_data->key_len = req->key_len;
4182                 auth_data->key_idx = req->key_idx;
4183                 memcpy(auth_data->key, req->key, req->key_len);
4184         }
4185
4186         auth_data->algorithm = auth_alg;
4187
4188         /* try to authenticate/probe */
4189
4190         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4191             ifmgd->assoc_data) {
4192                 err = -EBUSY;
4193                 goto err_free;
4194         }
4195
4196         if (ifmgd->auth_data)
4197                 ieee80211_destroy_auth_data(sdata, false);
4198
4199         /* prep auth_data so we don't go into idle on disassoc */
4200         ifmgd->auth_data = auth_data;
4201
4202         if (ifmgd->associated) {
4203                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4204
4205                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4206                                        WLAN_REASON_UNSPECIFIED,
4207                                        false, frame_buf);
4208
4209                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4210                                       sizeof(frame_buf));
4211         }
4212
4213         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4214
4215         err = ieee80211_prep_connection(sdata, req->bss, false);
4216         if (err)
4217                 goto err_clear;
4218
4219         err = ieee80211_probe_auth(sdata);
4220         if (err) {
4221                 sta_info_destroy_addr(sdata, req->bss->bssid);
4222                 goto err_clear;
4223         }
4224
4225         /* hold our own reference */
4226         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4227         return 0;
4228
4229  err_clear:
4230         memset(ifmgd->bssid, 0, ETH_ALEN);
4231         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4232         ifmgd->auth_data = NULL;
4233  err_free:
4234         kfree(auth_data);
4235         return err;
4236 }
4237
4238 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4239                                         const u8 *wmm_param, int len)
4240 {
4241         const u8 *pos;
4242         size_t left;
4243
4244         if (len < 8)
4245                 return false;
4246
4247         if (wmm_param[5] != 1 /* version */)
4248                 return false;
4249
4250         pos = wmm_param + 8;
4251         left = len - 8;
4252
4253         for (; left >= 4; left -= 4, pos += 4) {
4254                 u8 aifsn = pos[0] & 0x0f;
4255                 u8 ecwmin = pos[1] & 0x0f;
4256                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4257                 int aci = (pos[0] >> 5) & 0x03;
4258
4259                 if (aifsn < 2) {
4260                         sdata_info(sdata,
4261                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4262                                    aifsn, aci);
4263                         return false;
4264                 }
4265                 if (ecwmin > ecwmax) {
4266                         sdata_info(sdata,
4267                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4268                                    ecwmin, ecwmax, aci);
4269                         return false;
4270                 }
4271         }
4272
4273         return true;
4274 }
4275
4276 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4277                         struct cfg80211_assoc_request *req)
4278 {
4279         struct ieee80211_local *local = sdata->local;
4280         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4281         struct ieee80211_bss *bss = (void *)req->bss->priv;
4282         struct ieee80211_mgd_assoc_data *assoc_data;
4283         const struct cfg80211_bss_ies *beacon_ies;
4284         struct ieee80211_supported_band *sband;
4285         const u8 *ssidie, *ht_ie, *vht_ie;
4286         int i, err;
4287
4288         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4289         if (!assoc_data)
4290                 return -ENOMEM;
4291
4292         rcu_read_lock();
4293         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4294         if (!ssidie) {
4295                 rcu_read_unlock();
4296                 kfree(assoc_data);
4297                 return -EINVAL;
4298         }
4299         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4300         assoc_data->ssid_len = ssidie[1];
4301         rcu_read_unlock();
4302
4303         if (ifmgd->associated) {
4304                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4305
4306                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4307                                        WLAN_REASON_UNSPECIFIED,
4308                                        false, frame_buf);
4309
4310                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4311                                       sizeof(frame_buf));
4312         }
4313
4314         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4315                 err = -EBUSY;
4316                 goto err_free;
4317         }
4318
4319         if (ifmgd->assoc_data) {
4320                 err = -EBUSY;
4321                 goto err_free;
4322         }
4323
4324         if (ifmgd->auth_data) {
4325                 bool match;
4326
4327                 /* keep sta info, bssid if matching */
4328                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4329                 ieee80211_destroy_auth_data(sdata, match);
4330         }
4331
4332         /* prepare assoc data */
4333
4334         ifmgd->beacon_crc_valid = false;
4335
4336         assoc_data->wmm = bss->wmm_used &&
4337                           (local->hw.queues >= IEEE80211_NUM_ACS);
4338         if (assoc_data->wmm) {
4339                 /* try to check validity of WMM params IE */
4340                 const struct cfg80211_bss_ies *ies;
4341                 const u8 *wp, *start, *end;
4342
4343                 rcu_read_lock();
4344                 ies = rcu_dereference(req->bss->ies);
4345                 start = ies->data;
4346                 end = start + ies->len;
4347
4348                 while (true) {
4349                         wp = cfg80211_find_vendor_ie(
4350                                 WLAN_OUI_MICROSOFT,
4351                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4352                                 start, end - start);
4353                         if (!wp)
4354                                 break;
4355                         start = wp + wp[1] + 2;
4356                         /* if this IE is too short, try the next */
4357                         if (wp[1] <= 4)
4358                                 continue;
4359                         /* if this IE is WMM params, we found what we wanted */
4360                         if (wp[6] == 1)
4361                                 break;
4362                 }
4363
4364                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4365                                                         wp[1] - 2)) {
4366                         assoc_data->wmm = false;
4367                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4368                 }
4369                 rcu_read_unlock();
4370         }
4371
4372         /*
4373          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4374          * We still associate in non-HT mode (11a/b/g) if any one of these
4375          * ciphers is configured as pairwise.
4376          * We can set this to true for non-11n hardware, that'll be checked
4377          * separately along with the peer capabilities.
4378          */
4379         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4380                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4381                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4382                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4383                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4384                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4385                         netdev_info(sdata->dev,
4386                                     "disabling HT/VHT due to WEP/TKIP use\n");
4387                 }
4388         }
4389
4390         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4391                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4392                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4393         }
4394
4395         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4396                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4397
4398         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4399         sband = local->hw.wiphy->bands[req->bss->channel->band];
4400         if (!sband->ht_cap.ht_supported ||
4401             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4402             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4403                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4404                 if (!bss->wmm_used &&
4405                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4406                         netdev_info(sdata->dev,
4407                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4408         }
4409
4410         /* disable VHT if we don't support it or the AP doesn't use WMM */
4411         if (!sband->vht_cap.vht_supported ||
4412             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4413             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4414                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4415                 if (!bss->wmm_used &&
4416                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4417                         netdev_info(sdata->dev,
4418                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4419         }
4420
4421         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4422         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4423                sizeof(ifmgd->ht_capa_mask));
4424
4425         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4426         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4427                sizeof(ifmgd->vht_capa_mask));
4428
4429         if (req->ie && req->ie_len) {
4430                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4431                 assoc_data->ie_len = req->ie_len;
4432         }
4433
4434         assoc_data->bss = req->bss;
4435
4436         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4437                 if (ifmgd->powersave)
4438                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4439                 else
4440                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4441         } else
4442                 sdata->smps_mode = ifmgd->req_smps;
4443
4444         assoc_data->capability = req->bss->capability;
4445         assoc_data->supp_rates = bss->supp_rates;
4446         assoc_data->supp_rates_len = bss->supp_rates_len;
4447
4448         rcu_read_lock();
4449         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4450         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4451                 assoc_data->ap_ht_param =
4452                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4453         else
4454                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4455         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4456         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4457                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4458                        sizeof(struct ieee80211_vht_cap));
4459         else
4460                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4461         rcu_read_unlock();
4462
4463         if (bss->wmm_used && bss->uapsd_supported &&
4464             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
4465                 assoc_data->uapsd = true;
4466                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4467         } else {
4468                 assoc_data->uapsd = false;
4469                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4470         }
4471
4472         if (req->prev_bssid)
4473                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4474
4475         if (req->use_mfp) {
4476                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4477                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4478         } else {
4479                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4480                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4481         }
4482
4483         if (req->flags & ASSOC_REQ_USE_RRM)
4484                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4485         else
4486                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4487
4488         if (req->crypto.control_port)
4489                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4490         else
4491                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4492
4493         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4494         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4495         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4496                                                         sdata->vif.type);
4497
4498         /* kick off associate process */
4499
4500         ifmgd->assoc_data = assoc_data;
4501         ifmgd->dtim_period = 0;
4502         ifmgd->have_beacon = false;
4503
4504         err = ieee80211_prep_connection(sdata, req->bss, true);
4505         if (err)
4506                 goto err_clear;
4507
4508         rcu_read_lock();
4509         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4510
4511         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4512             !beacon_ies) {
4513                 /*
4514                  * Wait up to one beacon interval ...
4515                  * should this be more if we miss one?
4516                  */
4517                 sdata_info(sdata, "waiting for beacon from %pM\n",
4518                            ifmgd->bssid);
4519                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4520                 assoc_data->timeout_started = true;
4521                 assoc_data->need_beacon = true;
4522         } else if (beacon_ies) {
4523                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4524                                                     beacon_ies->data,
4525                                                     beacon_ies->len);
4526                 u8 dtim_count = 0;
4527
4528                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4529                         const struct ieee80211_tim_ie *tim;
4530                         tim = (void *)(tim_ie + 2);
4531                         ifmgd->dtim_period = tim->dtim_period;
4532                         dtim_count = tim->dtim_count;
4533                 }
4534                 ifmgd->have_beacon = true;
4535                 assoc_data->timeout = jiffies;
4536                 assoc_data->timeout_started = true;
4537
4538                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4539                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4540                         sdata->vif.bss_conf.sync_device_ts =
4541                                 bss->device_ts_beacon;
4542                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4543                 }
4544         } else {
4545                 assoc_data->timeout = jiffies;
4546                 assoc_data->timeout_started = true;
4547         }
4548         rcu_read_unlock();
4549
4550         run_again(sdata, assoc_data->timeout);
4551
4552         if (bss->corrupt_data) {
4553                 char *corrupt_type = "data";
4554                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4555                         if (bss->corrupt_data &
4556                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4557                                 corrupt_type = "beacon and probe response";
4558                         else
4559                                 corrupt_type = "beacon";
4560                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4561                         corrupt_type = "probe response";
4562                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4563                            corrupt_type);
4564         }
4565
4566         return 0;
4567  err_clear:
4568         memset(ifmgd->bssid, 0, ETH_ALEN);
4569         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4570         ifmgd->assoc_data = NULL;
4571  err_free:
4572         kfree(assoc_data);
4573         return err;
4574 }
4575
4576 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4577                          struct cfg80211_deauth_request *req)
4578 {
4579         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4580         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4581         bool tx = !req->local_state_change;
4582
4583         if (ifmgd->auth_data &&
4584             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4585                 sdata_info(sdata,
4586                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4587                            req->bssid, req->reason_code,
4588                            ieee80211_get_reason_code_string(req->reason_code));
4589
4590                 drv_mgd_prepare_tx(sdata->local, sdata);
4591                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4592                                                IEEE80211_STYPE_DEAUTH,
4593                                                req->reason_code, tx,
4594                                                frame_buf);
4595                 ieee80211_destroy_auth_data(sdata, false);
4596                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4597                                       IEEE80211_DEAUTH_FRAME_LEN);
4598
4599                 return 0;
4600         }
4601
4602         if (ifmgd->associated &&
4603             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4604                 sdata_info(sdata,
4605                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4606                            req->bssid, req->reason_code,
4607                            ieee80211_get_reason_code_string(req->reason_code));
4608
4609                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4610                                        req->reason_code, tx, frame_buf);
4611                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4612                                       IEEE80211_DEAUTH_FRAME_LEN);
4613                 return 0;
4614         }
4615
4616         return -ENOTCONN;
4617 }
4618
4619 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4620                            struct cfg80211_disassoc_request *req)
4621 {
4622         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4623         u8 bssid[ETH_ALEN];
4624         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4625
4626         /*
4627          * cfg80211 should catch this ... but it's racy since
4628          * we can receive a disassoc frame, process it, hand it
4629          * to cfg80211 while that's in a locked section already
4630          * trying to tell us that the user wants to disconnect.
4631          */
4632         if (ifmgd->associated != req->bss)
4633                 return -ENOLINK;
4634
4635         sdata_info(sdata,
4636                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4637                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4638
4639         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4640         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4641                                req->reason_code, !req->local_state_change,
4642                                frame_buf);
4643
4644         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4645                               IEEE80211_DEAUTH_FRAME_LEN);
4646
4647         return 0;
4648 }
4649
4650 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4651 {
4652         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4653
4654         /*
4655          * Make sure some work items will not run after this,
4656          * they will not do anything but might not have been
4657          * cancelled when disconnecting.
4658          */
4659         cancel_work_sync(&ifmgd->monitor_work);
4660         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4661         cancel_work_sync(&ifmgd->request_smps_work);
4662         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4663         cancel_work_sync(&ifmgd->chswitch_work);
4664         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4665
4666         sdata_lock(sdata);
4667         if (ifmgd->assoc_data) {
4668                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4669                 ieee80211_destroy_assoc_data(sdata, false);
4670                 cfg80211_assoc_timeout(sdata->dev, bss);
4671         }
4672         if (ifmgd->auth_data)
4673                 ieee80211_destroy_auth_data(sdata, false);
4674         del_timer_sync(&ifmgd->timer);
4675         sdata_unlock(sdata);
4676 }
4677
4678 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4679                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4680                                gfp_t gfp)
4681 {
4682         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4683
4684         trace_api_cqm_rssi_notify(sdata, rssi_event);
4685
4686         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4687 }
4688 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);