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         struct ieee80211_sta_ht_cap sta_ht_cap;
 161         u32 ht_cfreq, ret;
 162
 163         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
 164         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
 165
 166         chandef->chan = channel;
 167         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 168         chandef->center_freq1 = channel->center_freq;
 169         chandef->center_freq2 = 0;
 170
 171         if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
 172                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 173                 goto out;
 174         }
 175
 176         chandef->width = NL80211_CHAN_WIDTH_20;
 177
 178         if (!(ht_cap->cap_info &
 179               cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 180                 ret = IEEE80211_STA_DISABLE_40MHZ;
 181                 goto out;
 182         }
 183
 184         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
 185                                                   channel->band);
 186         /* check that channel matches the right operating channel */
 187         if (!tracking && channel->center_freq != ht_cfreq) {
 188                 /*
 189                  * It's possible that some APs are confused here;
 190                  * Netgear WNDR3700 sometimes reports 4 higher than
 191                  * the actual channel in association responses, but
 192                  * since we look at probe response/beacon data here
 193                  * it should be OK.
 194                  */
 195                 sdata_info(sdata,
 196                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
 197                            channel->center_freq, ht_cfreq,
 198                            ht_oper->primary_chan, channel->band);
 199                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 200                 goto out;
 201         }
 202
 203         /* check 40 MHz support, if we have it */
 204         if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 205                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 206                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 207                         chandef->width = NL80211_CHAN_WIDTH_40;
 208                         chandef->center_freq1 += 10;
 209                         break;
 210                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 211                         chandef->width = NL80211_CHAN_WIDTH_40;
 212                         chandef->center_freq1 -= 10;
 213                         break;
 214                 }
 215         } else {
 216                 /* 40 MHz (and 80 MHz) must be supported for VHT */
 217                 ret = IEEE80211_STA_DISABLE_VHT;
 218                 /* also mark 40 MHz disabled */
 219                 ret |= IEEE80211_STA_DISABLE_40MHZ;
 220                 goto out;
 221         }
 222
 223         if (!vht_oper || !sband->vht_cap.vht_supported) {
 224                 ret = IEEE80211_STA_DISABLE_VHT;
 225                 goto out;
 226         }
 227
 228         vht_chandef.chan = channel;
 229         vht_chandef.center_freq1 =
 230                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
 231                                                channel->band);
 232         vht_chandef.center_freq2 = 0;
 233
 234         switch (vht_oper->chan_width) {
 235         case IEEE80211_VHT_CHANWIDTH_USE_HT:
 236                 vht_chandef.width = chandef->width;
 237                 vht_chandef.center_freq1 = chandef->center_freq1;
 238                 break;
 239         case IEEE80211_VHT_CHANWIDTH_80MHZ:
 240                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
 241                 break;
 242         case IEEE80211_VHT_CHANWIDTH_160MHZ:
 243                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
 244                 break;
 245         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 246                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 247                 vht_chandef.center_freq2 =
 248                         ieee80211_channel_to_frequency(
 249                                 vht_oper->center_freq_seg2_idx,
 250                                 channel->band);
 251                 break;
 252         default:
 253                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 254                         sdata_info(sdata,
 255                                    "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
 256                                    vht_oper->chan_width);
 257                 ret = IEEE80211_STA_DISABLE_VHT;
 258                 goto out;
 259         }
 260
 261         if (!cfg80211_chandef_valid(&vht_chandef)) {
 262                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 263                         sdata_info(sdata,
 264                                    "AP VHT information is invalid, disable VHT\n");
 265                 ret = IEEE80211_STA_DISABLE_VHT;
 266                 goto out;
 267         }
 268
 269         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
 270                 ret = 0;
 271                 goto out;
 272         }
 273
 274         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
 275                 if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 276                         sdata_info(sdata,
 277                                    "AP VHT information doesn't match HT, disable VHT\n");
 278                 ret = IEEE80211_STA_DISABLE_VHT;
 279                 goto out;
 280         }
 281
 282         *chandef = vht_chandef;
 283
 284         ret = 0;
 285
 286 out:
 287         /*
 288          * When tracking the current AP, don't do any further checks if the
 289          * new chandef is identical to the one we're currently using for the
 290          * connection. This keeps us from playing ping-pong with regulatory,
 291          * without it the following can happen (for example):
 292          *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
 293          *  - AP advertises regdom US
 294          *  - CRDA loads regdom US with 80 MHz prohibited (old database)
 295          *  - the code below detects an unsupported channel, downgrades, and
 296          *    we disconnect from the AP in the caller
 297          *  - disconnect causes CRDA to reload world regdomain and the game
 298          *    starts anew.
 299          * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
 300          *
 301          * It seems possible that there are still scenarios with CSA or real
 302          * bandwidth changes where a this could happen, but those cases are
 303          * less common and wouldn't completely prevent using the AP.
 304          */
 305         if (tracking &&
 306             cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
 307                 return ret;
 308
 309         /* don't print the message below for VHT mismatch if VHT is disabled */
 310         if (ret & IEEE80211_STA_DISABLE_VHT)
 311                 vht_chandef = *chandef;
 312
 313         /*
 314          * Ignore the DISABLED flag when we're already connected and only
 315          * tracking the APs beacon for bandwidth changes - otherwise we
 316          * might get disconnected here if we connect to an AP, update our
 317          * regulatory information based on the AP's country IE and the
 318          * information we have is wrong/outdated and disables the channel
 319          * that we're actually using for the connection to the AP.
 320          */
 321         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
 322                                         tracking ? 0 :
 323                                                    IEEE80211_CHAN_DISABLED)) {
 324                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
 325                         ret = IEEE80211_STA_DISABLE_HT |
 326                               IEEE80211_STA_DISABLE_VHT;
 327                         break;
 328                 }
 329
 330                 ret |= ieee80211_chandef_downgrade(chandef);
 331         }
 332
 333         if (chandef->width != vht_chandef.width && !tracking)
 334                 sdata_info(sdata,
 335                            "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");
 336
 337         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
 338         return ret;
 339 }
 340
 341 static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
 342                                struct sta_info *sta,
 343                                const struct ieee80211_ht_cap *ht_cap,
 344                                const struct ieee80211_ht_operation *ht_oper,
 345                                const struct ieee80211_vht_operation *vht_oper,
 346                                const u8 *bssid, u32 *changed)
 347 {
 348         struct ieee80211_local *local = sdata->local;
 349         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 350         struct ieee80211_supported_band *sband;
 351         struct ieee80211_channel *chan;
 352         struct cfg80211_chan_def chandef;
 353         u16 ht_opmode;
 354         u32 flags;
 355         enum ieee80211_sta_rx_bandwidth new_sta_bw;
 356         int ret;
 357
 358         /* if HT was/is disabled, don't track any bandwidth changes */
 359         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
 360                 return 0;
 361
 362         /* don't check VHT if we associated as non-VHT station */
 363         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
 364                 vht_oper = NULL;
 365
 366         if (WARN_ON_ONCE(!sta))
 367                 return -EINVAL;
 368
 369         /*
 370          * if bss configuration changed store the new one -
 371          * this may be applicable even if channel is identical
 372          */
 373         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 374         if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 375                 *changed |= BSS_CHANGED_HT;
 376                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 377         }
 378
 379         chan = sdata->vif.bss_conf.chandef.chan;
 380         sband = local->hw.wiphy->bands[chan->band];
 381
 382         /* calculate new channel (type) based on HT/VHT operation IEs */
 383         flags = ieee80211_determine_chantype(sdata, sband, chan,
 384                                              ht_cap, ht_oper, vht_oper,
 385                                              &chandef, true);
 386
 387         /*
 388          * Downgrade the new channel if we associated with restricted
 389          * capabilities. For example, if we associated as a 20 MHz STA
 390          * to a 40 MHz AP (due to regulatory, capabilities or config
 391          * reasons) then switching to a 40 MHz channel now won't do us
 392          * any good -- we couldn't use it with the AP.
 393          */
 394         if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
 395             chandef.width == NL80211_CHAN_WIDTH_80P80)
 396                 flags |= ieee80211_chandef_downgrade(&chandef);
 397         if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
 398             chandef.width == NL80211_CHAN_WIDTH_160)
 399                 flags |= ieee80211_chandef_downgrade(&chandef);
 400         if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
 401             chandef.width > NL80211_CHAN_WIDTH_20)
 402                 flags |= ieee80211_chandef_downgrade(&chandef);
 403
 404         if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
 405                 return 0;
 406
 407         sdata_info(sdata,
 408                    "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
 409                    ifmgd->bssid, chandef.chan->center_freq, chandef.width,
 410                    chandef.center_freq1, chandef.center_freq2);
 411
 412         if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
 413                                       IEEE80211_STA_DISABLE_VHT |
 414                                       IEEE80211_STA_DISABLE_40MHZ |
 415                                       IEEE80211_STA_DISABLE_80P80MHZ |
 416                                       IEEE80211_STA_DISABLE_160MHZ)) ||
 417             !cfg80211_chandef_valid(&chandef)) {
 418                 sdata_info(sdata,
 419                            "AP %pM changed bandwidth in a way we can't support - disconnect\n",
 420                            ifmgd->bssid);
 421                 return -EINVAL;
 422         }
 423
 424         switch (chandef.width) {
 425         case NL80211_CHAN_WIDTH_20_NOHT:
 426         case NL80211_CHAN_WIDTH_20:
 427                 new_sta_bw = IEEE80211_STA_RX_BW_20;
 428                 break;
 429         case NL80211_CHAN_WIDTH_40:
 430                 new_sta_bw = IEEE80211_STA_RX_BW_40;
 431                 break;
 432         case NL80211_CHAN_WIDTH_80:
 433                 new_sta_bw = IEEE80211_STA_RX_BW_80;
 434                 break;
 435         case NL80211_CHAN_WIDTH_80P80:
 436         case NL80211_CHAN_WIDTH_160:
 437                 new_sta_bw = IEEE80211_STA_RX_BW_160;
 438                 break;
 439         default:
 440                 return -EINVAL;
 441         }
 442
 443         if (new_sta_bw > sta->cur_max_bandwidth)
 444                 new_sta_bw = sta->cur_max_bandwidth;
 445
 446         if (new_sta_bw < sta->sta.bandwidth) {
 447                 sta->sta.bandwidth = new_sta_bw;
 448                 rate_control_rate_update(local, sband, sta,
 449                                          IEEE80211_RC_BW_CHANGED);
 450         }
 451
 452         ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
 453         if (ret) {
 454                 sdata_info(sdata,
 455                            "AP %pM changed bandwidth to incompatible one - disconnect\n",
 456                            ifmgd->bssid);
 457                 return ret;
 458         }
 459
 460         if (new_sta_bw > sta->sta.bandwidth) {
 461                 sta->sta.bandwidth = new_sta_bw;
 462                 rate_control_rate_update(local, sband, sta,
 463                                          IEEE80211_RC_BW_CHANGED);
 464         }
 465
 466         return 0;
 467 }
 468
 469 /* frame sending functions */
 470
 471 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 472                                 struct sk_buff *skb, u8 ap_ht_param,
 473                                 struct ieee80211_supported_band *sband,
 474                                 struct ieee80211_channel *channel,
 475                                 enum ieee80211_smps_mode smps)
 476 {
 477         u8 *pos;
 478         u32 flags = channel->flags;
 479         u16 cap;
 480         struct ieee80211_sta_ht_cap ht_cap;
 481
 482         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 483
 484         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 485         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 486
 487         /* determine capability flags */
 488         cap = ht_cap.cap;
 489
 490         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 491         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 492                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 493                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 494                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 495                 }
 496                 break;
 497         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 498                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 499                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 500                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 501                 }
 502                 break;
 503         }
 504
 505         /*
 506          * If 40 MHz was disabled associate as though we weren't
 507          * capable of 40 MHz -- some broken APs will never fall
 508          * back to trying to transmit in 20 MHz.
 509          */
 510         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 511                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 512                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 513         }
 514
 515         /* set SM PS mode properly */
 516         cap &= ~IEEE80211_HT_CAP_SM_PS;
 517         switch (smps) {
 518         case IEEE80211_SMPS_AUTOMATIC:
 519         case IEEE80211_SMPS_NUM_MODES:
 520                 WARN_ON(1);
 521         case IEEE80211_SMPS_OFF:
 522                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 523                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 524                 break;
 525         case IEEE80211_SMPS_STATIC:
 526                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 527                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 528                 break;
 529         case IEEE80211_SMPS_DYNAMIC:
 530                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 531                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 532                 break;
 533         }
 534
 535         /* reserve and fill IE */
 536         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 537         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 538 }
 539
 540 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 541                                  struct sk_buff *skb,
 542                                  struct ieee80211_supported_band *sband,
 543                                  struct ieee80211_vht_cap *ap_vht_cap)
 544 {
 545         u8 *pos;
 546         u32 cap;
 547         struct ieee80211_sta_vht_cap vht_cap;
 548         u32 mask, ap_bf_sts, our_bf_sts;
 549
 550         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 551
 552         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 553         ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
 554
 555         /* determine capability flags */
 556         cap = vht_cap.cap;
 557
 558         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 559                 u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 560
 561                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 562                 if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 563                     bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 564                         cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 565         }
 566
 567         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 568                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 569                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 570         }
 571
 572         /*
 573          * Some APs apparently get confused if our capabilities are better
 574          * than theirs, so restrict what we advertise in the assoc request.
 575          */
 576         if (!(ap_vht_cap->vht_cap_info &
 577                         cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
 578                 cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
 579
 580         mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 581
 582         ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
 583         our_bf_sts = cap & mask;
 584
 585         if (ap_bf_sts < our_bf_sts) {
 586                 cap &= ~mask;
 587                 cap |= ap_bf_sts;
 588         }
 589
 590         /* reserve and fill IE */
 591         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 592         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 593 }
 594
 595 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 596 {
 597         struct ieee80211_local *local = sdata->local;
 598         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 599         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 600         struct sk_buff *skb;
 601         struct ieee80211_mgmt *mgmt;
 602         u8 *pos, qos_info;
 603         size_t offset = 0, noffset;
 604         int i, count, rates_len, supp_rates_len, shift;
 605         u16 capab;
 606         struct ieee80211_supported_band *sband;
 607         struct ieee80211_chanctx_conf *chanctx_conf;
 608         struct ieee80211_channel *chan;
 609         u32 rate_flags, rates = 0;
 610
 611         sdata_assert_lock(sdata);
 612
 613         rcu_read_lock();
 614         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 615         if (WARN_ON(!chanctx_conf)) {
 616                 rcu_read_unlock();
 617                 return;
 618         }
 619         chan = chanctx_conf->def.chan;
 620         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
 621         rcu_read_unlock();
 622         sband = local->hw.wiphy->bands[chan->band];
 623         shift = ieee80211_vif_get_shift(&sdata->vif);
 624
 625         if (assoc_data->supp_rates_len) {
 626                 /*
 627                  * Get all rates supported by the device and the AP as
 628                  * some APs don't like getting a superset of their rates
 629                  * in the association request (e.g. D-Link DAP 1353 in
 630                  * b-only mode)...
 631                  */
 632                 rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
 633                                                      assoc_data->supp_rates,
 634                                                      assoc_data->supp_rates_len,
 635                                                      &rates);
 636         } else {
 637                 /*
 638                  * In case AP not provide any supported rates information
 639                  * before association, we send information element(s) with
 640                  * all rates that we support.
 641                  */
 642                 rates_len = 0;
 643                 for (i = 0; i < sband->n_bitrates; i++) {
 644                         if ((rate_flags & sband->bitrates[i].flags)
 645                             != rate_flags)
 646                                 continue;
 647                         rates |= BIT(i);
 648                         rates_len++;
 649                 }
 650         }
 651
 652         skb = alloc_skb(local->hw.extra_tx_headroom +
 653                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 654                         2 + assoc_data->ssid_len + /* SSID */
 655                         4 + rates_len + /* (extended) rates */
 656                         4 + /* power capability */
 657                         2 + 2 * sband->n_channels + /* supported channels */
 658                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 659                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 660                         assoc_data->ie_len + /* extra IEs */
 661                         9, /* WMM */
 662                         GFP_KERNEL);
 663         if (!skb)
 664                 return;
 665
 666         skb_reserve(skb, local->hw.extra_tx_headroom);
 667
 668         capab = WLAN_CAPABILITY_ESS;
 669
 670         if (sband->band == IEEE80211_BAND_2GHZ) {
 671                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 672                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 673                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 674                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 675         }
 676
 677         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 678                 capab |= WLAN_CAPABILITY_PRIVACY;
 679
 680         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 681             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 682                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 683
 684         if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
 685                 capab |= WLAN_CAPABILITY_RADIO_MEASURE;
 686
 687         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 688         memset(mgmt, 0, 24);
 689         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 690         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 691         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 692
 693         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 694                 skb_put(skb, 10);
 695                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 696                                                   IEEE80211_STYPE_REASSOC_REQ);
 697                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 698                 mgmt->u.reassoc_req.listen_interval =
 699                                 cpu_to_le16(local->hw.conf.listen_interval);
 700                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 701                        ETH_ALEN);
 702         } else {
 703                 skb_put(skb, 4);
 704                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 705                                                   IEEE80211_STYPE_ASSOC_REQ);
 706                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 707                 mgmt->u.assoc_req.listen_interval =
 708                                 cpu_to_le16(local->hw.conf.listen_interval);
 709         }
 710
 711         /* SSID */
 712         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 713         *pos++ = WLAN_EID_SSID;
 714         *pos++ = assoc_data->ssid_len;
 715         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 716
 717         /* add all rates which were marked to be used above */
 718         supp_rates_len = rates_len;
 719         if (supp_rates_len > 8)
 720                 supp_rates_len = 8;
 721
 722         pos = skb_put(skb, supp_rates_len + 2);
 723         *pos++ = WLAN_EID_SUPP_RATES;
 724         *pos++ = supp_rates_len;
 725
 726         count = 0;
 727         for (i = 0; i < sband->n_bitrates; i++) {
 728                 if (BIT(i) & rates) {
 729                         int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 730                                                 5 * (1 << shift));
 731                         *pos++ = (u8) rate;
 732                         if (++count == 8)
 733                                 break;
 734                 }
 735         }
 736
 737         if (rates_len > count) {
 738                 pos = skb_put(skb, rates_len - count + 2);
 739                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 740                 *pos++ = rates_len - count;
 741
 742                 for (i++; i < sband->n_bitrates; i++) {
 743                         if (BIT(i) & rates) {
 744                                 int rate;
 745                                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
 746                                                     5 * (1 << shift));
 747                                 *pos++ = (u8) rate;
 748                         }
 749                 }
 750         }
 751
 752         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
 753             capab & WLAN_CAPABILITY_RADIO_MEASURE) {
 754                 pos = skb_put(skb, 4);
 755                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 756                 *pos++ = 2;
 757                 *pos++ = 0; /* min tx power */
 758                  /* max tx power */
 759                 *pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
 760         }
 761
 762         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 763                 /* TODO: get this in reg domain format */
 764                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 765                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 766                 *pos++ = 2 * sband->n_channels;
 767                 for (i = 0; i < sband->n_channels; i++) {
 768                         *pos++ = ieee80211_frequency_to_channel(
 769                                         sband->channels[i].center_freq);
 770                         *pos++ = 1; /* one channel in the subband*/
 771                 }
 772         }
 773
 774         /* if present, add any custom IEs that go before HT */
 775         if (assoc_data->ie_len) {
 776                 static const u8 before_ht[] = {
 777                         WLAN_EID_SSID,
 778                         WLAN_EID_SUPP_RATES,
 779                         WLAN_EID_EXT_SUPP_RATES,
 780                         WLAN_EID_PWR_CAPABILITY,
 781                         WLAN_EID_SUPPORTED_CHANNELS,
 782                         WLAN_EID_RSN,
 783                         WLAN_EID_QOS_CAPA,
 784                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 785                         WLAN_EID_MOBILITY_DOMAIN,
 786                         WLAN_EID_FAST_BSS_TRANSITION,   /* reassoc only */
 787                         WLAN_EID_RIC_DATA,              /* reassoc only */
 788                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 789                 };
 790                 static const u8 after_ric[] = {
 791                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 792                         WLAN_EID_HT_CAPABILITY,
 793                         WLAN_EID_BSS_COEX_2040,
 794                         WLAN_EID_EXT_CAPABILITY,
 795                         WLAN_EID_QOS_TRAFFIC_CAPA,
 796                         WLAN_EID_TIM_BCAST_REQ,
 797                         WLAN_EID_INTERWORKING,
 798                         /* 60GHz doesn't happen right now */
 799                         WLAN_EID_VHT_CAPABILITY,
 800                         WLAN_EID_OPMODE_NOTIF,
 801                 };
 802
 803                 noffset = ieee80211_ie_split_ric(assoc_data->ie,
 804                                                  assoc_data->ie_len,
 805                                                  before_ht,
 806                                                  ARRAY_SIZE(before_ht),
 807                                                  after_ric,
 808                                                  ARRAY_SIZE(after_ric),
 809                                                  offset);
 810                 pos = skb_put(skb, noffset - offset);
 811                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 812                 offset = noffset;
 813         }
 814
 815         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 816                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 817                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 818
 819         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 820                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 821                                     sband, chan, sdata->smps_mode);
 822
 823         /* if present, add any custom IEs that go before VHT */
 824         if (assoc_data->ie_len) {
 825                 static const u8 before_vht[] = {
 826                         WLAN_EID_SSID,
 827                         WLAN_EID_SUPP_RATES,
 828                         WLAN_EID_EXT_SUPP_RATES,
 829                         WLAN_EID_PWR_CAPABILITY,
 830                         WLAN_EID_SUPPORTED_CHANNELS,
 831                         WLAN_EID_RSN,
 832                         WLAN_EID_QOS_CAPA,
 833                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 834                         WLAN_EID_MOBILITY_DOMAIN,
 835                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 836                         WLAN_EID_HT_CAPABILITY,
 837                         WLAN_EID_BSS_COEX_2040,
 838                         WLAN_EID_EXT_CAPABILITY,
 839                         WLAN_EID_QOS_TRAFFIC_CAPA,
 840                         WLAN_EID_TIM_BCAST_REQ,
 841                         WLAN_EID_INTERWORKING,
 842                 };
 843
 844                 /* RIC already taken above, so no need to handle here anymore */
 845                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 846                                              before_vht, ARRAY_SIZE(before_vht),
 847                                              offset);
 848                 pos = skb_put(skb, noffset - offset);
 849                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 850                 offset = noffset;
 851         }
 852
 853         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 854                 ieee80211_add_vht_ie(sdata, skb, sband,
 855                                      &assoc_data->ap_vht_cap);
 856
 857         /* if present, add any custom non-vendor IEs that go after HT */
 858         if (assoc_data->ie_len) {
 859                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 860                                                     assoc_data->ie_len,
 861                                                     offset);
 862                 pos = skb_put(skb, noffset - offset);
 863                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 864                 offset = noffset;
 865         }
 866
 867         if (assoc_data->wmm) {
 868                 if (assoc_data->uapsd) {
 869                         qos_info = ifmgd->uapsd_queues;
 870                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 871                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 872                 } else {
 873                         qos_info = 0;
 874                 }
 875
 876                 pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
 877         }
 878
 879         /* add any remaining custom (i.e. vendor specific here) IEs */
 880         if (assoc_data->ie_len) {
 881                 noffset = assoc_data->ie_len;
 882                 pos = skb_put(skb, noffset - offset);
 883                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 884         }
 885
 886         drv_mgd_prepare_tx(local, sdata);
 887
 888         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 889         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 890                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
 891                                                 IEEE80211_TX_INTFL_MLME_CONN_TX;
 892         ieee80211_tx_skb(sdata, skb);
 893 }
 894
 895 void ieee80211_send_pspoll(struct ieee80211_local *local,
 896                            struct ieee80211_sub_if_data *sdata)
 897 {
 898         struct ieee80211_pspoll *pspoll;
 899         struct sk_buff *skb;
 900
 901         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 902         if (!skb)
 903                 return;
 904
 905         pspoll = (struct ieee80211_pspoll *) skb->data;
 906         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 907
 908         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 909         ieee80211_tx_skb(sdata, skb);
 910 }
 911
 912 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 913                              struct ieee80211_sub_if_data *sdata,
 914                              int powersave)
 915 {
 916         struct sk_buff *skb;
 917         struct ieee80211_hdr_3addr *nullfunc;
 918         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 919
 920         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 921         if (!skb)
 922                 return;
 923
 924         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 925         if (powersave)
 926                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 927
 928         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
 929                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 930
 931         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 932                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 933
 934         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
 935                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 936
 937         ieee80211_tx_skb(sdata, skb);
 938 }
 939
 940 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 941                                           struct ieee80211_sub_if_data *sdata)
 942 {
 943         struct sk_buff *skb;
 944         struct ieee80211_hdr *nullfunc;
 945         __le16 fc;
 946
 947         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 948                 return;
 949
 950         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 951         if (!skb)
 952                 return;
 953
 954         skb_reserve(skb, local->hw.extra_tx_headroom);
 955
 956         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 957         memset(nullfunc, 0, 30);
 958         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 959                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 960         nullfunc->frame_control = fc;
 961         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 962         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 963         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 964         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 965
 966         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 967         ieee80211_tx_skb(sdata, skb);
 968 }
 969
 970 /* spectrum management related things */
 971 static void ieee80211_chswitch_work(struct work_struct *work)
 972 {
 973         struct ieee80211_sub_if_data *sdata =
 974                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 975         struct ieee80211_local *local = sdata->local;
 976         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 977         int ret;
 978
 979         if (!ieee80211_sdata_running(sdata))
 980                 return;
 981
 982         sdata_lock(sdata);
 983         mutex_lock(&local->mtx);
 984         mutex_lock(&local->chanctx_mtx);
 985
 986         if (!ifmgd->associated)
 987                 goto out;
 988
 989         if (!sdata->vif.csa_active)
 990                 goto out;
 991
 992         /*
 993          * using reservation isn't immediate as it may be deferred until later
 994          * with multi-vif. once reservation is complete it will re-schedule the
 995          * work with no reserved_chanctx so verify chandef to check if it
 996          * completed successfully
 997          */
 998
 999         if (sdata->reserved_chanctx) {
1000                 /*
1001                  * with multi-vif csa driver may call ieee80211_csa_finish()
1002                  * many times while waiting for other interfaces to use their
1003                  * reservations
1004                  */
1005                 if (sdata->reserved_ready)
1006                         goto out;
1007
1008                 ret = ieee80211_vif_use_reserved_context(sdata);
1009                 if (ret) {
1010                         sdata_info(sdata,
1011                                    "failed to use reserved channel context, disconnecting (err=%d)\n",
1012                                    ret);
1013                         ieee80211_queue_work(&sdata->local->hw,
1014                                              &ifmgd->csa_connection_drop_work);
1015                         goto out;
1016                 }
1017
1018                 goto out;
1019         }
1020
1021         if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
1022                                         &sdata->csa_chandef)) {
1023                 sdata_info(sdata,
1024                            "failed to finalize channel switch, disconnecting\n");
1025                 ieee80211_queue_work(&sdata->local->hw,
1026                                      &ifmgd->csa_connection_drop_work);
1027                 goto out;
1028         }
1029
1030         /* XXX: shouldn't really modify cfg80211-owned data! */
1031         ifmgd->associated->channel = sdata->csa_chandef.chan;
1032
1033         ifmgd->csa_waiting_bcn = true;
1034
1035         ieee80211_sta_reset_beacon_monitor(sdata);
1036         ieee80211_sta_reset_conn_monitor(sdata);
1037
1038 out:
1039         mutex_unlock(&local->chanctx_mtx);
1040         mutex_unlock(&local->mtx);
1041         sdata_unlock(sdata);
1042 }
1043
1044 static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
1045 {
1046         struct ieee80211_local *local = sdata->local;
1047         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1048         int ret;
1049
1050         sdata_assert_lock(sdata);
1051
1052         WARN_ON(!sdata->vif.csa_active);
1053
1054         if (sdata->csa_block_tx) {
1055                 ieee80211_wake_vif_queues(local, sdata,
1056                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1057                 sdata->csa_block_tx = false;
1058         }
1059
1060         sdata->vif.csa_active = false;
1061         ifmgd->csa_waiting_bcn = false;
1062
1063         ret = drv_post_channel_switch(sdata);
1064         if (ret) {
1065                 sdata_info(sdata,
1066                            "driver post channel switch failed, disconnecting\n");
1067                 ieee80211_queue_work(&local->hw,
1068                                      &ifmgd->csa_connection_drop_work);
1069                 return;
1070         }
1071
1072         cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1073 }
1074
1075 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
1076 {
1077         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1078         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1079
1080         trace_api_chswitch_done(sdata, success);
1081         if (!success) {
1082                 sdata_info(sdata,
1083                            "driver channel switch failed, disconnecting\n");
1084                 ieee80211_queue_work(&sdata->local->hw,
1085                                      &ifmgd->csa_connection_drop_work);
1086         } else {
1087                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
1088         }
1089 }
1090 EXPORT_SYMBOL(ieee80211_chswitch_done);
1091
1092 static void ieee80211_chswitch_timer(unsigned long data)
1093 {
1094         struct ieee80211_sub_if_data *sdata =
1095                 (struct ieee80211_sub_if_data *) data;
1096
1097         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1098 }
1099
1100 static void
1101 ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1102                                  u64 timestamp, u32 device_timestamp,
1103                                  struct ieee802_11_elems *elems,
1104                                  bool beacon)
1105 {
1106         struct ieee80211_local *local = sdata->local;
1107         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1108         struct cfg80211_bss *cbss = ifmgd->associated;
1109         struct ieee80211_chanctx_conf *conf;
1110         struct ieee80211_chanctx *chanctx;
1111         enum ieee80211_band current_band;
1112         struct ieee80211_csa_ie csa_ie;
1113         struct ieee80211_channel_switch ch_switch;
1114         int res;
1115
1116         sdata_assert_lock(sdata);
1117
1118         if (!cbss)
1119                 return;
1120
1121         if (local->scanning)
1122                 return;
1123
1124         /* disregard subsequent announcements if we are already processing */
1125         if (sdata->vif.csa_active)
1126                 return;
1127
1128         current_band = cbss->channel->band;
1129         memset(&csa_ie, 0, sizeof(csa_ie));
1130         res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1131                                            ifmgd->flags,
1132                                            ifmgd->associated->bssid, &csa_ie);
1133         if (res < 0)
1134                 ieee80211_queue_work(&local->hw,
1135                                      &ifmgd->csa_connection_drop_work);
1136         if (res)
1137                 return;
1138
1139         if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1140                                      IEEE80211_CHAN_DISABLED)) {
1141                 sdata_info(sdata,
1142                            "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1143                            ifmgd->associated->bssid,
1144                            csa_ie.chandef.chan->center_freq,
1145                            csa_ie.chandef.width, csa_ie.chandef.center_freq1,
1146                            csa_ie.chandef.center_freq2);
1147                 ieee80211_queue_work(&local->hw,
1148                                      &ifmgd->csa_connection_drop_work);
1149                 return;
1150         }
1151
1152         mutex_lock(&local->mtx);
1153         mutex_lock(&local->chanctx_mtx);
1154         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1155                                          lockdep_is_held(&local->chanctx_mtx));
1156         if (!conf) {
1157                 sdata_info(sdata,
1158                            "no channel context assigned to vif?, disconnecting\n");
1159                 ieee80211_queue_work(&local->hw,
1160                                      &ifmgd->csa_connection_drop_work);
1161                 mutex_unlock(&local->chanctx_mtx);
1162                 mutex_unlock(&local->mtx);
1163                 return;
1164         }
1165
1166         chanctx = container_of(conf, struct ieee80211_chanctx, conf);
1167
1168         if (local->use_chanctx &&
1169             !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
1170                 sdata_info(sdata,
1171                            "driver doesn't support chan-switch with channel contexts\n");
1172                 ieee80211_queue_work(&local->hw,
1173                                      &ifmgd->csa_connection_drop_work);
1174                 mutex_unlock(&local->chanctx_mtx);
1175                 mutex_unlock(&local->mtx);
1176                 return;
1177         }
1178
1179         ch_switch.timestamp = timestamp;
1180         ch_switch.device_timestamp = device_timestamp;
1181         ch_switch.block_tx = csa_ie.mode;
1182         ch_switch.chandef = csa_ie.chandef;
1183         ch_switch.count = csa_ie.count;
1184
1185         if (drv_pre_channel_switch(sdata, &ch_switch)) {
1186                 sdata_info(sdata,
1187                            "preparing for channel switch failed, disconnecting\n");
1188                 ieee80211_queue_work(&local->hw,
1189                                      &ifmgd->csa_connection_drop_work);
1190                 mutex_unlock(&local->chanctx_mtx);
1191                 mutex_unlock(&local->mtx);
1192                 return;
1193         }
1194
1195         res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
1196                                             chanctx->mode, false);
1197         if (res) {
1198                 sdata_info(sdata,
1199                            "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
1200                            res);
1201                 ieee80211_queue_work(&local->hw,
1202                                      &ifmgd->csa_connection_drop_work);
1203                 mutex_unlock(&local->chanctx_mtx);
1204                 mutex_unlock(&local->mtx);
1205                 return;
1206         }
1207         mutex_unlock(&local->chanctx_mtx);
1208
1209         sdata->vif.csa_active = true;
1210         sdata->csa_chandef = csa_ie.chandef;
1211         sdata->csa_block_tx = csa_ie.mode;
1212
1213         if (sdata->csa_block_tx)
1214                 ieee80211_stop_vif_queues(local, sdata,
1215                                           IEEE80211_QUEUE_STOP_REASON_CSA);
1216         mutex_unlock(&local->mtx);
1217
1218         cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
1219                                           csa_ie.count);
1220
1221         if (local->ops->channel_switch) {
1222                 /* use driver's channel switch callback */
1223                 drv_channel_switch(local, sdata, &ch_switch);
1224                 return;
1225         }
1226
1227         /* channel switch handled in software */
1228         if (csa_ie.count <= 1)
1229                 ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1230         else
1231                 mod_timer(&ifmgd->chswitch_timer,
1232                           TU_TO_EXP_TIME((csa_ie.count - 1) *
1233                                          cbss->beacon_interval));
1234 }
1235
1236 static bool
1237 ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
1238                                  struct ieee80211_channel *channel,
1239                                  const u8 *country_ie, u8 country_ie_len,
1240                                  const u8 *pwr_constr_elem,
1241                                  int *chan_pwr, int *pwr_reduction)
1242 {
1243         struct ieee80211_country_ie_triplet *triplet;
1244         int chan = ieee80211_frequency_to_channel(channel->center_freq);
1245         int i, chan_increment;
1246         bool have_chan_pwr = false;
1247
1248         /* Invalid IE */
1249         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1250                 return false;
1251
1252         triplet = (void *)(country_ie + 3);
1253         country_ie_len -= 3;
1254
1255         switch (channel->band) {
1256         default:
1257                 WARN_ON_ONCE(1);
1258                 /* fall through */
1259         case IEEE80211_BAND_2GHZ:
1260         case IEEE80211_BAND_60GHZ:
1261                 chan_increment = 1;
1262                 break;
1263         case IEEE80211_BAND_5GHZ:
1264                 chan_increment = 4;
1265                 break;
1266         }
1267
1268         /* find channel */
1269         while (country_ie_len >= 3) {
1270                 u8 first_channel = triplet->chans.first_channel;
1271
1272                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
1273                         goto next;
1274
1275                 for (i = 0; i < triplet->chans.num_channels; i++) {
1276                         if (first_channel + i * chan_increment == chan) {
1277                                 have_chan_pwr = true;
1278                                 *chan_pwr = triplet->chans.max_power;
1279                                 break;
1280                         }
1281                 }
1282                 if (have_chan_pwr)
1283                         break;
1284
1285  next:
1286                 triplet++;
1287                 country_ie_len -= 3;
1288         }
1289
1290         if (have_chan_pwr && pwr_constr_elem)
1291                 *pwr_reduction = *pwr_constr_elem;
1292         else
1293                 *pwr_reduction = 0;
1294
1295         return have_chan_pwr;
1296 }
1297
1298 static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
1299                                       struct ieee80211_channel *channel,
1300                                       const u8 *cisco_dtpc_ie,
1301                                       int *pwr_level)
1302 {
1303         /* From practical testing, the first data byte of the DTPC element
1304          * seems to contain the requested dBm level, and the CLI on Cisco
1305          * APs clearly state the range is -127 to 127 dBm, which indicates
1306          * a signed byte, although it seemingly never actually goes negative.
1307          * The other byte seems to always be zero.
1308          */
1309         *pwr_level = (__s8)cisco_dtpc_ie[4];
1310 }
1311
1312 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
1313                                        struct ieee80211_channel *channel,
1314                                        struct ieee80211_mgmt *mgmt,
1315                                        const u8 *country_ie, u8 country_ie_len,
1316                                        const u8 *pwr_constr_ie,
1317                                        const u8 *cisco_dtpc_ie)
1318 {
1319         bool has_80211h_pwr = false, has_cisco_pwr = false;
1320         int chan_pwr = 0, pwr_reduction_80211h = 0;
1321         int pwr_level_cisco, pwr_level_80211h;
1322         int new_ap_level;
1323         __le16 capab = mgmt->u.probe_resp.capab_info;
1324
1325         if (country_ie &&
1326             (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
1327              capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1328                 has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
1329                         sdata, channel, country_ie, country_ie_len,
1330                         pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1331                 pwr_level_80211h =
1332                         max_t(int, 0, chan_pwr - pwr_reduction_80211h);
1333         }
1334
1335         if (cisco_dtpc_ie) {
1336                 ieee80211_find_cisco_dtpc(
1337                         sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
1338                 has_cisco_pwr = true;
1339         }
1340
1341         if (!has_80211h_pwr && !has_cisco_pwr)
1342                 return 0;
1343
1344         /* If we have both 802.11h and Cisco DTPC, apply both limits
1345          * by picking the smallest of the two power levels advertised.
1346          */
1347         if (has_80211h_pwr &&
1348             (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1349                 sdata_info(sdata,
1350                            "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
1351                            pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
1352                            sdata->u.mgd.bssid);
1353                 new_ap_level = pwr_level_80211h;
1354         } else {  /* has_cisco_pwr is always true here. */
1355                 sdata_info(sdata,
1356                            "Limiting TX power to %d dBm as advertised by %pM\n",
1357                            pwr_level_cisco, sdata->u.mgd.bssid);
1358                 new_ap_level = pwr_level_cisco;
1359         }
1360
1361         if (sdata->ap_power_level == new_ap_level)
1362                 return 0;
1363
1364         sdata->ap_power_level = new_ap_level;
1365         if (__ieee80211_recalc_txpower(sdata))
1366                 return BSS_CHANGED_TXPOWER;
1367         return 0;
1368 }
1369
1370 /* powersave */
1371 static void ieee80211_enable_ps(struct ieee80211_local *local,
1372                                 struct ieee80211_sub_if_data *sdata)
1373 {
1374         struct ieee80211_conf *conf = &local->hw.conf;
1375
1376         /*
1377          * If we are scanning right now then the parameters will
1378          * take effect when scan finishes.
1379          */
1380         if (local->scanning)
1381                 return;
1382
1383         if (conf->dynamic_ps_timeout > 0 &&
1384             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
1385                 mod_timer(&local->dynamic_ps_timer, jiffies +
1386                           msecs_to_jiffies(conf->dynamic_ps_timeout));
1387         } else {
1388                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1389                         ieee80211_send_nullfunc(local, sdata, 1);
1390
1391                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1392                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
1393                         return;
1394
1395                 conf->flags |= IEEE80211_CONF_PS;
1396                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1397         }
1398 }
1399
1400 static void ieee80211_change_ps(struct ieee80211_local *local)
1401 {
1402         struct ieee80211_conf *conf = &local->hw.conf;
1403
1404         if (local->ps_sdata) {
1405                 ieee80211_enable_ps(local, local->ps_sdata);
1406         } else if (conf->flags & IEEE80211_CONF_PS) {
1407                 conf->flags &= ~IEEE80211_CONF_PS;
1408                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1409                 del_timer_sync(&local->dynamic_ps_timer);
1410                 cancel_work_sync(&local->dynamic_ps_enable_work);
1411         }
1412 }
1413
1414 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
1415 {
1416         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
1417         struct sta_info *sta = NULL;
1418         bool authorized = false;
1419
1420         if (!mgd->powersave)
1421                 return false;
1422
1423         if (mgd->broken_ap)
1424                 return false;
1425
1426         if (!mgd->associated)
1427                 return false;
1428
1429         if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1430                 return false;
1431
1432         if (!mgd->have_beacon)
1433                 return false;
1434
1435         rcu_read_lock();
1436         sta = sta_info_get(sdata, mgd->bssid);
1437         if (sta)
1438                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1439         rcu_read_unlock();
1440
1441         return authorized;
1442 }
1443
1444 /* need to hold RTNL or interface lock */
1445 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1446 {
1447         struct ieee80211_sub_if_data *sdata, *found = NULL;
1448         int count = 0;
1449         int timeout;
1450
1451         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1452                 local->ps_sdata = NULL;
1453                 return;
1454         }
1455
1456         list_for_each_entry(sdata, &local->interfaces, list) {
1457                 if (!ieee80211_sdata_running(sdata))
1458                         continue;
1459                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1460                         /* If an AP vif is found, then disable PS
1461                          * by setting the count to zero thereby setting
1462                          * ps_sdata to NULL.
1463                          */
1464                         count = 0;
1465                         break;
1466                 }
1467                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1468                         continue;
1469                 found = sdata;
1470                 count++;
1471         }
1472
1473         if (count == 1 && ieee80211_powersave_allowed(found)) {
1474                 s32 beaconint_us;
1475
1476                 if (latency < 0)
1477                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1478
1479                 beaconint_us = ieee80211_tu_to_usec(
1480                                         found->vif.bss_conf.beacon_int);
1481
1482                 timeout = local->dynamic_ps_forced_timeout;
1483                 if (timeout < 0) {
1484                         /*
1485                          * Go to full PSM if the user configures a very low
1486                          * latency requirement.
1487                          * The 2000 second value is there for compatibility
1488                          * until the PM_QOS_NETWORK_LATENCY is configured
1489                          * with real values.
1490                          */
1491                         if (latency > (1900 * USEC_PER_MSEC) &&
1492                             latency != (2000 * USEC_PER_SEC))
1493                                 timeout = 0;
1494                         else
1495                                 timeout = 100;
1496                 }
1497                 local->hw.conf.dynamic_ps_timeout = timeout;
1498
1499                 if (beaconint_us > latency) {
1500                         local->ps_sdata = NULL;
1501                 } else {
1502                         int maxslp = 1;
1503                         u8 dtimper = found->u.mgd.dtim_period;
1504
1505                         /* If the TIM IE is invalid, pretend the value is 1 */
1506                         if (!dtimper)
1507                                 dtimper = 1;
1508                         else if (dtimper > 1)
1509                                 maxslp = min_t(int, dtimper,
1510                                                     latency / beaconint_us);
1511
1512                         local->hw.conf.max_sleep_period = maxslp;
1513                         local->hw.conf.ps_dtim_period = dtimper;
1514                         local->ps_sdata = found;
1515                 }
1516         } else {
1517                 local->ps_sdata = NULL;
1518         }
1519
1520         ieee80211_change_ps(local);
1521 }
1522
1523 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1524 {
1525         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1526
1527         if (sdata->vif.bss_conf.ps != ps_allowed) {
1528                 sdata->vif.bss_conf.ps = ps_allowed;
1529                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1530         }
1531 }
1532
1533 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1534 {
1535         struct ieee80211_local *local =
1536                 container_of(work, struct ieee80211_local,
1537                              dynamic_ps_disable_work);
1538
1539         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1540                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1541                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1542         }
1543
1544         ieee80211_wake_queues_by_reason(&local->hw,
1545                                         IEEE80211_MAX_QUEUE_MAP,
1546                                         IEEE80211_QUEUE_STOP_REASON_PS,
1547                                         false);
1548 }
1549
1550 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1551 {
1552         struct ieee80211_local *local =
1553                 container_of(work, struct ieee80211_local,
1554                              dynamic_ps_enable_work);
1555         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1556         struct ieee80211_if_managed *ifmgd;
1557         unsigned long flags;
1558         int q;
1559
1560         /* can only happen when PS was just disabled anyway */
1561         if (!sdata)
1562                 return;
1563
1564         ifmgd = &sdata->u.mgd;
1565
1566         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1567                 return;
1568
1569         if (local->hw.conf.dynamic_ps_timeout > 0) {
1570                 /* don't enter PS if TX frames are pending */
1571                 if (drv_tx_frames_pending(local)) {
1572                         mod_timer(&local->dynamic_ps_timer, jiffies +
1573                                   msecs_to_jiffies(
1574                                   local->hw.conf.dynamic_ps_timeout));
1575                         return;
1576                 }
1577
1578                 /*
1579                  * transmission can be stopped by others which leads to
1580                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1581                  * is not the actual idle state.
1582                  */
1583                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1584                 for (q = 0; q < local->hw.queues; q++) {
1585                         if (local->queue_stop_reasons[q]) {
1586                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1587                                                        flags);
1588                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1589                                           msecs_to_jiffies(
1590                                           local->hw.conf.dynamic_ps_timeout));
1591                                 return;
1592                         }
1593                 }
1594                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1595         }
1596
1597         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1598             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1599                 if (drv_tx_frames_pending(local)) {
1600                         mod_timer(&local->dynamic_ps_timer, jiffies +
1601                                   msecs_to_jiffies(
1602                                   local->hw.conf.dynamic_ps_timeout));
1603                 } else {
1604                         ieee80211_send_nullfunc(local, sdata, 1);
1605                         /* Flush to get the tx status of nullfunc frame */
1606                         ieee80211_flush_queues(local, sdata);
1607                 }
1608         }
1609
1610         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1611               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1612             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1613                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1614                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1615                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1616         }
1617 }
1618
1619 void ieee80211_dynamic_ps_timer(unsigned long data)
1620 {
1621         struct ieee80211_local *local = (void *) data;
1622
1623         if (local->quiescing || local->suspended)
1624                 return;
1625
1626         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1627 }
1628
1629 void ieee80211_dfs_cac_timer_work(struct work_struct *work)
1630 {
1631         struct delayed_work *delayed_work =
1632                 container_of(work, struct delayed_work, work);
1633         struct ieee80211_sub_if_data *sdata =
1634                 container_of(delayed_work, struct ieee80211_sub_if_data,
1635                              dfs_cac_timer_work);
1636         struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1637
1638         mutex_lock(&sdata->local->mtx);
1639         if (sdata->wdev.cac_started) {
1640                 ieee80211_vif_release_channel(sdata);
1641                 cfg80211_cac_event(sdata->dev, &chandef,
1642                                    NL80211_RADAR_CAC_FINISHED,
1643                                    GFP_KERNEL);
1644         }
1645         mutex_unlock(&sdata->local->mtx);
1646 }
1647
1648 static bool
1649 __ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1650 {
1651         struct ieee80211_local *local = sdata->local;
1652         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1653         bool ret;
1654         int ac;
1655
1656         if (local->hw.queues < IEEE80211_NUM_ACS)
1657                 return false;
1658
1659         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1660                 struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
1661                 int non_acm_ac;
1662                 unsigned long now = jiffies;
1663
1664                 if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
1665                     tx_tspec->admitted_time &&
1666                     time_after(now, tx_tspec->time_slice_start + HZ)) {
1667                         tx_tspec->consumed_tx_time = 0;
1668                         tx_tspec->time_slice_start = now;
1669
1670                         if (tx_tspec->downgraded)
1671                                 tx_tspec->action =
1672                                         TX_TSPEC_ACTION_STOP_DOWNGRADE;
1673                 }
1674
1675                 switch (tx_tspec->action) {
1676                 case TX_TSPEC_ACTION_STOP_DOWNGRADE:
1677                         /* take the original parameters */
1678                         if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
1679                                 sdata_err(sdata,
1680                                           "failed to set TX queue parameters for queue %d\n",
1681                                           ac);
1682                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1683                         tx_tspec->downgraded = false;
1684                         ret = true;
1685                         break;
1686                 case TX_TSPEC_ACTION_DOWNGRADE:
1687                         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
1688                                 tx_tspec->action = TX_TSPEC_ACTION_NONE;
1689                                 ret = true;
1690                                 break;
1691                         }
1692                         /* downgrade next lower non-ACM AC */
1693                         for (non_acm_ac = ac + 1;
1694                              non_acm_ac < IEEE80211_NUM_ACS;
1695                              non_acm_ac++)
1696                                 if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
1697                                         break;
1698                         /* The loop will result in using BK even if it requires
1699                          * admission control, such configuration makes no sense
1700                          * and we have to transmit somehow - the AC selection
1701                          * does the same thing.
1702                          */
1703                         if (drv_conf_tx(local, sdata, ac,
1704                                         &sdata->tx_conf[non_acm_ac]))
1705                                 sdata_err(sdata,
1706                                           "failed to set TX queue parameters for queue %d\n",
1707                                           ac);
1708                         tx_tspec->action = TX_TSPEC_ACTION_NONE;
1709                         ret = true;
1710                         schedule_delayed_work(&ifmgd->tx_tspec_wk,
1711                                 tx_tspec->time_slice_start + HZ - now + 1);
1712                         break;
1713                 case TX_TSPEC_ACTION_NONE:
1714                         /* nothing now */
1715                         break;
1716                 }
1717         }
1718
1719         return ret;
1720 }
1721
1722 void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
1723 {
1724         if (__ieee80211_sta_handle_tspec_ac_params(sdata))
1725                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
1726 }
1727
1728 static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
1729 {
1730         struct ieee80211_sub_if_data *sdata;
1731
1732         sdata = container_of(work, struct ieee80211_sub_if_data,
1733                              u.mgd.tx_tspec_wk.work);
1734         ieee80211_sta_handle_tspec_ac_params(sdata);
1735 }
1736
1737 /* MLME */
1738 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1739                                      struct ieee80211_sub_if_data *sdata,
1740                                      const u8 *wmm_param, size_t wmm_param_len)
1741 {
1742         struct ieee80211_tx_queue_params params;
1743         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1744         size_t left;
1745         int count;
1746         const u8 *pos;
1747         u8 uapsd_queues = 0;
1748
1749         if (!local->ops->conf_tx)
1750                 return false;
1751
1752         if (local->hw.queues < IEEE80211_NUM_ACS)
1753                 return false;
1754
1755         if (!wmm_param)
1756                 return false;
1757
1758         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1759                 return false;
1760
1761         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1762                 uapsd_queues = ifmgd->uapsd_queues;
1763
1764         count = wmm_param[6] & 0x0f;
1765         if (count == ifmgd->wmm_last_param_set)
1766                 return false;
1767         ifmgd->wmm_last_param_set = count;
1768
1769         pos = wmm_param + 8;
1770         left = wmm_param_len - 8;
1771
1772         memset(&params, 0, sizeof(params));
1773
1774         sdata->wmm_acm = 0;
1775         for (; left >= 4; left -= 4, pos += 4) {
1776                 int aci = (pos[0] >> 5) & 0x03;
1777                 int acm = (pos[0] >> 4) & 0x01;
1778                 bool uapsd = false;
1779                 int queue;
1780
1781                 switch (aci) {
1782                 case 1: /* AC_BK */
1783                         queue = 3;
1784                         if (acm)
1785                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1786                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1787                                 uapsd = true;
1788                         break;
1789                 case 2: /* AC_VI */
1790                         queue = 1;
1791                         if (acm)
1792                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1793                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1794                                 uapsd = true;
1795                         break;
1796                 case 3: /* AC_VO */
1797                         queue = 0;
1798                         if (acm)
1799                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1800                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1801                                 uapsd = true;
1802                         break;
1803                 case 0: /* AC_BE */
1804                 default:
1805                         queue = 2;
1806                         if (acm)
1807                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1808                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1809                                 uapsd = true;
1810                         break;
1811                 }
1812
1813                 params.aifs = pos[0] & 0x0f;
1814                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1815                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1816                 params.txop = get_unaligned_le16(pos + 2);
1817                 params.acm = acm;
1818                 params.uapsd = uapsd;
1819
1820                 mlme_dbg(sdata,
1821                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
1822                          queue, aci, acm,
1823                          params.aifs, params.cw_min, params.cw_max,
1824                          params.txop, params.uapsd,
1825                          ifmgd->tx_tspec[queue].downgraded);
1826                 sdata->tx_conf[queue] = params;
1827                 if (!ifmgd->tx_tspec[queue].downgraded &&
1828                     drv_conf_tx(local, sdata, queue, &params))
1829                         sdata_err(sdata,
1830                                   "failed to set TX queue parameters for queue %d\n",
1831                                   queue);
1832         }
1833
1834         /* enable WMM or activate new settings */
1835         sdata->vif.bss_conf.qos = true;
1836         return true;
1837 }
1838
1839 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1840 {
1841         lockdep_assert_held(&sdata->local->mtx);
1842
1843         sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1844         ieee80211_run_deferred_scan(sdata->local);
1845 }
1846
1847 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1848 {
1849         mutex_lock(&sdata->local->mtx);
1850         __ieee80211_stop_poll(sdata);
1851         mutex_unlock(&sdata->local->mtx);
1852 }
1853
1854 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1855                                            u16 capab, bool erp_valid, u8 erp)
1856 {
1857         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1858         u32 changed = 0;
1859         bool use_protection;
1860         bool use_short_preamble;
1861         bool use_short_slot;
1862
1863         if (erp_valid) {
1864                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1865                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1866         } else {
1867                 use_protection = false;
1868                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1869         }
1870
1871         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1872         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1873                 use_short_slot = true;
1874
1875         if (use_protection != bss_conf->use_cts_prot) {
1876                 bss_conf->use_cts_prot = use_protection;
1877                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1878         }
1879
1880         if (use_short_preamble != bss_conf->use_short_preamble) {
1881                 bss_conf->use_short_preamble = use_short_preamble;
1882                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1883         }
1884
1885         if (use_short_slot != bss_conf->use_short_slot) {
1886                 bss_conf->use_short_slot = use_short_slot;
1887                 changed |= BSS_CHANGED_ERP_SLOT;
1888         }
1889
1890         return changed;
1891 }
1892
1893 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1894                                      struct cfg80211_bss *cbss,
1895                                      u32 bss_info_changed)
1896 {
1897         struct ieee80211_bss *bss = (void *)cbss->priv;
1898         struct ieee80211_local *local = sdata->local;
1899         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1900
1901         bss_info_changed |= BSS_CHANGED_ASSOC;
1902         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1903                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1904
1905         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1906                 beacon_loss_count * bss_conf->beacon_int));
1907
1908         sdata->u.mgd.associated = cbss;
1909         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1910
1911         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1912
1913         if (sdata->vif.p2p) {
1914                 const struct cfg80211_bss_ies *ies;
1915
1916                 rcu_read_lock();
1917                 ies = rcu_dereference(cbss->ies);
1918                 if (ies) {
1919                         int ret;
1920
1921                         ret = cfg80211_get_p2p_attr(
1922                                         ies->data, ies->len,
1923                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1924                                         (u8 *) &bss_conf->p2p_noa_attr,
1925                                         sizeof(bss_conf->p2p_noa_attr));
1926                         if (ret >= 2) {
1927                                 sdata->u.mgd.p2p_noa_index =
1928                                         bss_conf->p2p_noa_attr.index;
1929                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1930                         }
1931                 }
1932                 rcu_read_unlock();
1933         }
1934
1935         /* just to be sure */
1936         ieee80211_stop_poll(sdata);
1937
1938         ieee80211_led_assoc(local, 1);
1939
1940         if (sdata->u.mgd.have_beacon) {
1941                 /*
1942                  * If the AP is buggy we may get here with no DTIM period
1943                  * known, so assume it's 1 which is the only safe assumption
1944                  * in that case, although if the TIM IE is broken powersave
1945                  * probably just won't work at all.
1946                  */
1947                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1948                 bss_conf->beacon_rate = bss->beacon_rate;
1949                 bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1950         } else {
1951                 bss_conf->beacon_rate = NULL;
1952                 bss_conf->dtim_period = 0;
1953         }
1954
1955         bss_conf->assoc = 1;
1956
1957         /* Tell the driver to monitor connection quality (if supported) */
1958         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1959             bss_conf->cqm_rssi_thold)
1960                 bss_info_changed |= BSS_CHANGED_CQM;
1961
1962         /* Enable ARP filtering */
1963         if (bss_conf->arp_addr_cnt)
1964                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1965
1966         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1967
1968         mutex_lock(&local->iflist_mtx);
1969         ieee80211_recalc_ps(local, -1);
1970         mutex_unlock(&local->iflist_mtx);
1971
1972         ieee80211_recalc_smps(sdata);
1973         ieee80211_recalc_ps_vif(sdata);
1974
1975         netif_carrier_on(sdata->dev);
1976 }
1977
1978 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1979                                    u16 stype, u16 reason, bool tx,
1980                                    u8 *frame_buf)
1981 {
1982         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1983         struct ieee80211_local *local = sdata->local;
1984         u32 changed = 0;
1985
1986         sdata_assert_lock(sdata);
1987
1988         if (WARN_ON_ONCE(tx && !frame_buf))
1989                 return;
1990
1991         if (WARN_ON(!ifmgd->associated))
1992                 return;
1993
1994         ieee80211_stop_poll(sdata);
1995
1996         ifmgd->associated = NULL;
1997         netif_carrier_off(sdata->dev);
1998
1999         /*
2000          * if we want to get out of ps before disassoc (why?) we have
2001          * to do it before sending disassoc, as otherwise the null-packet
2002          * won't be valid.
2003          */
2004         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2005                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2006                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
2007         }
2008         local->ps_sdata = NULL;
2009
2010         /* disable per-vif ps */
2011         ieee80211_recalc_ps_vif(sdata);
2012
2013         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
2014         if (tx)
2015                 ieee80211_flush_queues(local, sdata);
2016
2017         /* deauthenticate/disassociate now */
2018         if (tx || frame_buf)
2019                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
2020                                                reason, tx, frame_buf);
2021
2022         /* flush out frame */
2023         if (tx)
2024                 ieee80211_flush_queues(local, sdata);
2025
2026         /* clear bssid only after building the needed mgmt frames */
2027         memset(ifmgd->bssid, 0, ETH_ALEN);
2028
2029         /* remove AP and TDLS peers */
2030         sta_info_flush(sdata);
2031
2032         /* finally reset all BSS / config parameters */
2033         changed |= ieee80211_reset_erp_info(sdata);
2034
2035         ieee80211_led_assoc(local, 0);
2036         changed |= BSS_CHANGED_ASSOC;
2037         sdata->vif.bss_conf.assoc = false;
2038
2039         ifmgd->p2p_noa_index = -1;
2040         memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
2041                sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2042
2043         /* on the next assoc, re-program HT/VHT parameters */
2044         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
2045         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2046         memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
2047         memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2048
2049         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2050
2051         del_timer_sync(&local->dynamic_ps_timer);
2052         cancel_work_sync(&local->dynamic_ps_enable_work);
2053
2054         /* Disable ARP filtering */
2055         if (sdata->vif.bss_conf.arp_addr_cnt)
2056                 changed |= BSS_CHANGED_ARP_FILTER;
2057
2058         sdata->vif.bss_conf.qos = false;
2059         changed |= BSS_CHANGED_QOS;
2060
2061         /* The BSSID (not really interesting) and HT changed */
2062         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
2063         ieee80211_bss_info_change_notify(sdata, changed);
2064
2065         /* disassociated - set to defaults now */
2066         ieee80211_set_wmm_default(sdata, false);
2067
2068         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
2069         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
2070         del_timer_sync(&sdata->u.mgd.timer);
2071         del_timer_sync(&sdata->u.mgd.chswitch_timer);
2072
2073         sdata->vif.bss_conf.dtim_period = 0;
2074         sdata->vif.bss_conf.beacon_rate = NULL;
2075
2076         ifmgd->have_beacon = false;
2077
2078         ifmgd->flags = 0;
2079         mutex_lock(&local->mtx);
2080         ieee80211_vif_release_channel(sdata);
2081
2082         sdata->vif.csa_active = false;
2083         ifmgd->csa_waiting_bcn = false;
2084         if (sdata->csa_block_tx) {
2085                 ieee80211_wake_vif_queues(local, sdata,
2086                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2087                 sdata->csa_block_tx = false;
2088         }
2089         mutex_unlock(&local->mtx);
2090
2091         /* existing TX TSPEC sessions no longer exist */
2092         memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
2093         cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);
2094
2095         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2096 }
2097
2098 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
2099                              struct ieee80211_hdr *hdr)
2100 {
2101         /*
2102          * We can postpone the mgd.timer whenever receiving unicast frames
2103          * from AP because we know that the connection is working both ways
2104          * at that time. But multicast frames (and hence also beacons) must
2105          * be ignored here, because we need to trigger the timer during
2106          * data idle periods for sending the periodic probe request to the
2107          * AP we're connected to.
2108          */
2109         if (is_multicast_ether_addr(hdr->addr1))
2110                 return;
2111
2112         ieee80211_sta_reset_conn_monitor(sdata);
2113 }
2114
2115 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
2116 {
2117         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2118         struct ieee80211_local *local = sdata->local;
2119
2120         mutex_lock(&local->mtx);
2121         if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
2122                 goto out;
2123
2124         __ieee80211_stop_poll(sdata);
2125
2126         mutex_lock(&local->iflist_mtx);
2127         ieee80211_recalc_ps(local, -1);
2128         mutex_unlock(&local->iflist_mtx);
2129
2130         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
2131                 goto out;
2132
2133         /*
2134          * We've received a probe response, but are not sure whether
2135          * we have or will be receiving any beacons or data, so let's
2136          * schedule the timers again, just in case.
2137          */
2138         ieee80211_sta_reset_beacon_monitor(sdata);
2139
2140         mod_timer(&ifmgd->conn_mon_timer,
2141                   round_jiffies_up(jiffies +
2142                                    IEEE80211_CONNECTION_IDLE_TIME));
2143 out:
2144         mutex_unlock(&local->mtx);
2145 }
2146
2147 static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
2148                                            struct ieee80211_hdr *hdr,
2149                                            u16 tx_time)
2150 {
2151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2152         u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
2153         int ac = ieee80211_ac_from_tid(tid);
2154         struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
2155         unsigned long now = jiffies;
2156
2157         if (likely(!tx_tspec->admitted_time))
2158                 return;
2159
2160         if (time_after(now, tx_tspec->time_slice_start + HZ)) {
2161                 tx_tspec->consumed_tx_time = 0;
2162                 tx_tspec->time_slice_start = now;
2163
2164                 if (tx_tspec->downgraded) {
2165                         tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
2166                         schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2167                 }
2168         }
2169
2170         if (tx_tspec->downgraded)
2171                 return;
2172
2173         tx_tspec->consumed_tx_time += tx_time;
2174
2175         if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
2176                 tx_tspec->downgraded = true;
2177                 tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
2178                 schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
2179         }
2180 }
2181
2182 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2183                              struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2184 {
2185         ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);
2186
2187         if (!ieee80211_is_data(hdr->frame_control))
2188             return;
2189
2190         if (ieee80211_is_nullfunc(hdr->frame_control) &&
2191             sdata->u.mgd.probe_send_count > 0) {
2192                 if (ack)
2193                         ieee80211_sta_reset_conn_monitor(sdata);
2194                 else
2195                         sdata->u.mgd.nullfunc_failed = true;
2196                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2197                 return;
2198         }
2199
2200         if (ack)
2201                 ieee80211_sta_reset_conn_monitor(sdata);
2202 }
2203
2204 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
2205 {
2206         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2207         const u8 *ssid;
2208         u8 *dst = ifmgd->associated->bssid;
2209         u8 unicast_limit = max(1, max_probe_tries - 3);
2210
2211         /*
2212          * Try sending broadcast probe requests for the last three
2213          * probe requests after the first ones failed since some
2214          * buggy APs only support broadcast probe requests.
2215          */
2216         if (ifmgd->probe_send_count >= unicast_limit)
2217                 dst = NULL;
2218
2219         /*
2220          * When the hardware reports an accurate Tx ACK status, it's
2221          * better to send a nullfunc frame instead of a probe request,
2222          * as it will kick us off the AP quickly if we aren't associated
2223          * anymore. The timeout will be reset if the frame is ACKed by
2224          * the AP.
2225          */
2226         ifmgd->probe_send_count++;
2227
2228         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2229                 ifmgd->nullfunc_failed = false;
2230                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
2231         } else {
2232                 int ssid_len;
2233
2234                 rcu_read_lock();
2235                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2236                 if (WARN_ON_ONCE(ssid == NULL))
2237                         ssid_len = 0;
2238                 else
2239                         ssid_len = ssid[1];
2240
2241                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
2242                                          ssid + 2, ssid_len, NULL,
2243                                          0, (u32) -1, true, 0,
2244                                          ifmgd->associated->channel, false);
2245                 rcu_read_unlock();
2246         }
2247
2248         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2249         run_again(sdata, ifmgd->probe_timeout);
2250 }
2251
2252 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
2253                                    bool beacon)
2254 {
2255         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2256         bool already = false;
2257
2258         if (!ieee80211_sdata_running(sdata))
2259                 return;
2260
2261         sdata_lock(sdata);
2262
2263         if (!ifmgd->associated)
2264                 goto out;
2265
2266         mutex_lock(&sdata->local->mtx);
2267
2268         if (sdata->local->tmp_channel || sdata->local->scanning) {
2269                 mutex_unlock(&sdata->local->mtx);
2270                 goto out;
2271         }
2272
2273         if (beacon) {
2274                 mlme_dbg_ratelimited(sdata,
2275                                      "detected beacon loss from AP (missed %d beacons) - probing\n",
2276                                      beacon_loss_count);
2277
2278                 ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2279         }
2280
2281         /*
2282          * The driver/our work has already reported this event or the
2283          * connection monitoring has kicked in and we have already sent
2284          * a probe request. Or maybe the AP died and the driver keeps
2285          * reporting until we disassociate...
2286          *
2287          * In either case we have to ignore the current call to this
2288          * function (except for setting the correct probe reason bit)
2289          * because otherwise we would reset the timer every time and
2290          * never check whether we received a probe response!
2291          */
2292         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
2293                 already = true;
2294
2295         ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
2296
2297         mutex_unlock(&sdata->local->mtx);
2298
2299         if (already)
2300                 goto out;
2301
2302         mutex_lock(&sdata->local->iflist_mtx);
2303         ieee80211_recalc_ps(sdata->local, -1);
2304         mutex_unlock(&sdata->local->iflist_mtx);
2305
2306         ifmgd->probe_send_count = 0;
2307         ieee80211_mgd_probe_ap_send(sdata);
2308  out:
2309         sdata_unlock(sdata);
2310 }
2311
2312 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
2313                                           struct ieee80211_vif *vif)
2314 {
2315         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2316         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2317         struct cfg80211_bss *cbss;
2318         struct sk_buff *skb;
2319         const u8 *ssid;
2320         int ssid_len;
2321
2322         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2323                 return NULL;
2324
2325         sdata_assert_lock(sdata);
2326
2327         if (ifmgd->associated)
2328                 cbss = ifmgd->associated;
2329         else if (ifmgd->auth_data)
2330                 cbss = ifmgd->auth_data->bss;
2331         else if (ifmgd->assoc_data)
2332                 cbss = ifmgd->assoc_data->bss;
2333         else
2334                 return NULL;
2335
2336         rcu_read_lock();
2337         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2338         if (WARN_ON_ONCE(ssid == NULL))
2339                 ssid_len = 0;
2340         else
2341                 ssid_len = ssid[1];
2342
2343         skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
2344                                         (u32) -1, cbss->channel,
2345                                         ssid + 2, ssid_len,
2346                                         NULL, 0, true);
2347         rcu_read_unlock();
2348
2349         return skb;
2350 }
2351 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
2352
2353 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2354 {
2355         struct ieee80211_local *local = sdata->local;
2356         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2357         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2358
2359         sdata_lock(sdata);
2360         if (!ifmgd->associated) {
2361                 sdata_unlock(sdata);
2362                 return;
2363         }
2364
2365         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
2366                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2367                                true, frame_buf);
2368         mutex_lock(&local->mtx);
2369         sdata->vif.csa_active = false;
2370         ifmgd->csa_waiting_bcn = false;
2371         if (sdata->csa_block_tx) {
2372                 ieee80211_wake_vif_queues(local, sdata,
2373                                           IEEE80211_QUEUE_STOP_REASON_CSA);
2374                 sdata->csa_block_tx = false;
2375         }
2376         mutex_unlock(&local->mtx);
2377
2378         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
2379                               IEEE80211_DEAUTH_FRAME_LEN);
2380         sdata_unlock(sdata);
2381 }
2382
2383 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
2384 {
2385         struct ieee80211_sub_if_data *sdata =
2386                 container_of(work, struct ieee80211_sub_if_data,
2387                              u.mgd.beacon_connection_loss_work);
2388         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2389         struct sta_info *sta;
2390
2391         if (ifmgd->associated) {
2392                 rcu_read_lock();
2393                 sta = sta_info_get(sdata, ifmgd->bssid);
2394                 if (sta)
2395                         sta->beacon_loss_count++;
2396                 rcu_read_unlock();
2397         }
2398
2399         if (ifmgd->connection_loss) {
2400                 sdata_info(sdata, "Connection to AP %pM lost\n",
2401                            ifmgd->bssid);
2402                 __ieee80211_disconnect(sdata);
2403         } else {
2404                 ieee80211_mgd_probe_ap(sdata, true);
2405         }
2406 }
2407
2408 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
2409 {
2410         struct ieee80211_sub_if_data *sdata =
2411                 container_of(work, struct ieee80211_sub_if_data,
2412                              u.mgd.csa_connection_drop_work);
2413
2414         __ieee80211_disconnect(sdata);
2415 }
2416
2417 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
2418 {
2419         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2420         struct ieee80211_hw *hw = &sdata->local->hw;
2421
2422         trace_api_beacon_loss(sdata);
2423
2424         sdata->u.mgd.connection_loss = false;
2425         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2426 }
2427 EXPORT_SYMBOL(ieee80211_beacon_loss);
2428
2429 void ieee80211_connection_loss(struct ieee80211_vif *vif)
2430 {
2431         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2432         struct ieee80211_hw *hw = &sdata->local->hw;
2433
2434         trace_api_connection_loss(sdata);
2435
2436         sdata->u.mgd.connection_loss = true;
2437         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2438 }
2439 EXPORT_SYMBOL(ieee80211_connection_loss);
2440
2441
2442 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
2443                                         bool assoc)
2444 {
2445         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2446
2447         sdata_assert_lock(sdata);
2448
2449         if (!assoc) {
2450                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
2451
2452                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2453                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2454                 sdata->u.mgd.flags = 0;
2455                 mutex_lock(&sdata->local->mtx);
2456                 ieee80211_vif_release_channel(sdata);
2457                 mutex_unlock(&sdata->local->mtx);
2458         }
2459
2460         cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
2461         kfree(auth_data);
2462         sdata->u.mgd.auth_data = NULL;
2463 }
2464
2465 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
2466                                      struct ieee80211_mgmt *mgmt, size_t len)
2467 {
2468         struct ieee80211_local *local = sdata->local;
2469         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
2470         u8 *pos;
2471         struct ieee802_11_elems elems;
2472         u32 tx_flags = 0;
2473
2474         pos = mgmt->u.auth.variable;
2475         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2476         if (!elems.challenge)
2477                 return;
2478         auth_data->expected_transaction = 4;
2479         drv_mgd_prepare_tx(sdata->local, sdata);
2480         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2481                 tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2482                            IEEE80211_TX_INTFL_MLME_CONN_TX;
2483         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
2484                             elems.challenge - 2, elems.challenge_len + 2,
2485                             auth_data->bss->bssid, auth_data->bss->bssid,
2486                             auth_data->key, auth_data->key_len,
2487                             auth_data->key_idx, tx_flags);
2488 }
2489
2490 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
2491                                    struct ieee80211_mgmt *mgmt, size_t len)
2492 {
2493         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2494         u8 bssid[ETH_ALEN];
2495         u16 auth_alg, auth_transaction, status_code;
2496         struct sta_info *sta;
2497
2498         sdata_assert_lock(sdata);
2499
2500         if (len < 24 + 6)
2501                 return;
2502
2503         if (!ifmgd->auth_data || ifmgd->auth_data->done)
2504                 return;
2505
2506         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2507
2508         if (!ether_addr_equal(bssid, mgmt->bssid))
2509                 return;
2510
2511         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
2512         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
2513         status_code = le16_to_cpu(mgmt->u.auth.status_code);
2514
2515         if (auth_alg != ifmgd->auth_data->algorithm ||
2516             auth_transaction != ifmgd->auth_data->expected_transaction) {
2517                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
2518                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
2519                            auth_transaction,
2520                            ifmgd->auth_data->expected_transaction);
2521                 return;
2522         }
2523
2524         if (status_code != WLAN_STATUS_SUCCESS) {
2525                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
2526                            mgmt->sa, status_code);
2527                 ieee80211_destroy_auth_data(sdata, false);
2528                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2529                 return;
2530         }
2531
2532         switch (ifmgd->auth_data->algorithm) {
2533         case WLAN_AUTH_OPEN:
2534         case WLAN_AUTH_LEAP:
2535         case WLAN_AUTH_FT:
2536         case WLAN_AUTH_SAE:
2537                 break;
2538         case WLAN_AUTH_SHARED_KEY:
2539                 if (ifmgd->auth_data->expected_transaction != 4) {
2540                         ieee80211_auth_challenge(sdata, mgmt, len);
2541                         /* need another frame */
2542                         return;
2543                 }
2544                 break;
2545         default:
2546                 WARN_ONCE(1, "invalid auth alg %d",
2547                           ifmgd->auth_data->algorithm);
2548                 return;
2549         }
2550
2551         sdata_info(sdata, "authenticated\n");
2552         ifmgd->auth_data->done = true;
2553         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2554         ifmgd->auth_data->timeout_started = true;
2555         run_again(sdata, ifmgd->auth_data->timeout);
2556
2557         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
2558             ifmgd->auth_data->expected_transaction != 2) {
2559                 /*
2560                  * Report auth frame to user space for processing since another
2561                  * round of Authentication frames is still needed.
2562                  */
2563                 cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2564                 return;
2565         }
2566
2567         /* move station state to auth */
2568         mutex_lock(&sdata->local->sta_mtx);
2569         sta = sta_info_get(sdata, bssid);
2570         if (!sta) {
2571                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2572                 goto out_err;
2573         }
2574         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2575                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2576                 goto out_err;
2577         }
2578         mutex_unlock(&sdata->local->sta_mtx);
2579
2580         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2581         return;
2582  out_err:
2583         mutex_unlock(&sdata->local->sta_mtx);
2584         /* ignore frame -- wait for timeout */
2585 }
2586
2587 #define case_WLAN(type) \
2588         case WLAN_REASON_##type: return #type
2589
2590 static const char *ieee80211_get_reason_code_string(u16 reason_code)
2591 {
2592         switch (reason_code) {
2593         case_WLAN(UNSPECIFIED);
2594         case_WLAN(PREV_AUTH_NOT_VALID);
2595         case_WLAN(DEAUTH_LEAVING);
2596         case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
2597         case_WLAN(DISASSOC_AP_BUSY);
2598         case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
2599         case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
2600         case_WLAN(DISASSOC_STA_HAS_LEFT);
2601         case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
2602         case_WLAN(DISASSOC_BAD_POWER);
2603         case_WLAN(DISASSOC_BAD_SUPP_CHAN);
2604         case_WLAN(INVALID_IE);
2605         case_WLAN(MIC_FAILURE);
2606         case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
2607         case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
2608         case_WLAN(IE_DIFFERENT);
2609         case_WLAN(INVALID_GROUP_CIPHER);
2610         case_WLAN(INVALID_PAIRWISE_CIPHER);
2611         case_WLAN(INVALID_AKMP);
2612         case_WLAN(UNSUPP_RSN_VERSION);
2613         case_WLAN(INVALID_RSN_IE_CAP);
2614         case_WLAN(IEEE8021X_FAILED);
2615         case_WLAN(CIPHER_SUITE_REJECTED);
2616         case_WLAN(DISASSOC_UNSPECIFIED_QOS);
2617         case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
2618         case_WLAN(DISASSOC_LOW_ACK);
2619         case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
2620         case_WLAN(QSTA_LEAVE_QBSS);
2621         case_WLAN(QSTA_NOT_USE);
2622         case_WLAN(QSTA_REQUIRE_SETUP);
2623         case_WLAN(QSTA_TIMEOUT);
2624         case_WLAN(QSTA_CIPHER_NOT_SUPP);
2625         case_WLAN(MESH_PEER_CANCELED);
2626         case_WLAN(MESH_MAX_PEERS);
2627         case_WLAN(MESH_CONFIG);
2628         case_WLAN(MESH_CLOSE);
2629         case_WLAN(MESH_MAX_RETRIES);
2630         case_WLAN(MESH_CONFIRM_TIMEOUT);
2631         case_WLAN(MESH_INVALID_GTK);
2632         case_WLAN(MESH_INCONSISTENT_PARAM);
2633         case_WLAN(MESH_INVALID_SECURITY);
2634         case_WLAN(MESH_PATH_ERROR);
2635         case_WLAN(MESH_PATH_NOFORWARD);
2636         case_WLAN(MESH_PATH_DEST_UNREACHABLE);
2637         case_WLAN(MAC_EXISTS_IN_MBSS);
2638         case_WLAN(MESH_CHAN_REGULATORY);
2639         case_WLAN(MESH_CHAN);
2640         default: return "<unknown>";
2641         }
2642 }
2643
2644 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2645                                      struct ieee80211_mgmt *mgmt, size_t len)
2646 {
2647         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2648         const u8 *bssid = NULL;
2649         u16 reason_code;
2650
2651         sdata_assert_lock(sdata);
2652
2653         if (len < 24 + 2)
2654                 return;
2655
2656         if (!ifmgd->associated ||
2657             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2658                 return;
2659
2660         bssid = ifmgd->associated->bssid;
2661
2662         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2663
2664         sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
2665                    bssid, reason_code, ieee80211_get_reason_code_string(reason_code));
2666
2667         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2668
2669         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2670 }
2671
2672
2673 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2674                                        struct ieee80211_mgmt *mgmt, size_t len)
2675 {
2676         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2677         u16 reason_code;
2678
2679         sdata_assert_lock(sdata);
2680
2681         if (len < 24 + 2)
2682                 return;
2683
2684         if (!ifmgd->associated ||
2685             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2686                 return;
2687
2688         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2689
2690         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2691                    mgmt->sa, reason_code);
2692
2693         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2694
2695         cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2696 }
2697
2698 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2699                                 u8 *supp_rates, unsigned int supp_rates_len,
2700                                 u32 *rates, u32 *basic_rates,
2701                                 bool *have_higher_than_11mbit,
2702                                 int *min_rate, int *min_rate_index,
2703                                 int shift, u32 rate_flags)
2704 {
2705         int i, j;
2706
2707         for (i = 0; i < supp_rates_len; i++) {
2708                 int rate = supp_rates[i] & 0x7f;
2709                 bool is_basic = !!(supp_rates[i] & 0x80);
2710
2711                 if ((rate * 5 * (1 << shift)) > 110)
2712                         *have_higher_than_11mbit = true;
2713
2714                 /*
2715                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2716                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2717                  *
2718                  * Note: Even through the membership selector and the basic
2719                  *       rate flag share the same bit, they are not exactly
2720                  *       the same.
2721                  */
2722                 if (!!(supp_rates[i] & 0x80) &&
2723                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2724                         continue;
2725
2726                 for (j = 0; j < sband->n_bitrates; j++) {
2727                         struct ieee80211_rate *br;
2728                         int brate;
2729
2730                         br = &sband->bitrates[j];
2731                         if ((rate_flags & br->flags) != rate_flags)
2732                                 continue;
2733
2734                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2735                         if (brate == rate) {
2736                                 *rates |= BIT(j);
2737                                 if (is_basic)
2738                                         *basic_rates |= BIT(j);
2739                                 if ((rate * 5) < *min_rate) {
2740                                         *min_rate = rate * 5;
2741                                         *min_rate_index = j;
2742                                 }
2743                                 break;
2744                         }
2745                 }
2746         }
2747 }
2748
2749 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2750                                          bool assoc)
2751 {
2752         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2753
2754         sdata_assert_lock(sdata);
2755
2756         if (!assoc) {
2757                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2758
2759                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2760                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2761                 sdata->u.mgd.flags = 0;
2762                 mutex_lock(&sdata->local->mtx);
2763                 ieee80211_vif_release_channel(sdata);
2764                 mutex_unlock(&sdata->local->mtx);
2765         }
2766
2767         kfree(assoc_data);
2768         sdata->u.mgd.assoc_data = NULL;
2769 }
2770
2771 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2772                                     struct cfg80211_bss *cbss,
2773                                     struct ieee80211_mgmt *mgmt, size_t len)
2774 {
2775         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2776         struct ieee80211_local *local = sdata->local;
2777         struct ieee80211_supported_band *sband;
2778         struct sta_info *sta;
2779         u8 *pos;
2780         u16 capab_info, aid;
2781         struct ieee802_11_elems elems;
2782         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2783         const struct cfg80211_bss_ies *bss_ies = NULL;
2784         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2785         u32 changed = 0;
2786         int err;
2787         bool ret;
2788
2789         /* AssocResp and ReassocResp have identical structure */
2790
2791         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2792         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2793
2794         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2795                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2796                            aid);
2797         aid &= ~(BIT(15) | BIT(14));
2798
2799         ifmgd->broken_ap = false;
2800
2801         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2802                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2803                            aid);
2804                 aid = 0;
2805                 ifmgd->broken_ap = true;
2806         }
2807
2808         pos = mgmt->u.assoc_resp.variable;
2809         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
2810
2811         if (!elems.supp_rates) {
2812                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2813                 return false;
2814         }
2815
2816         ifmgd->aid = aid;
2817         ifmgd->tdls_chan_switch_prohibited =
2818                 elems.ext_capab && elems.ext_capab_len >= 5 &&
2819                 (elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2820
2821         /*
2822          * Some APs are erroneously not including some information in their
2823          * (re)association response frames. Try to recover by using the data
2824          * from the beacon or probe response. This seems to afflict mobile
2825          * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
2826          * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
2827          */
2828         if ((assoc_data->wmm && !elems.wmm_param) ||
2829             (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2830              (!elems.ht_cap_elem || !elems.ht_operation)) ||
2831             (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2832              (!elems.vht_cap_elem || !elems.vht_operation))) {
2833                 const struct cfg80211_bss_ies *ies;
2834                 struct ieee802_11_elems bss_elems;
2835
2836                 rcu_read_lock();
2837                 ies = rcu_dereference(cbss->ies);
2838                 if (ies)
2839                         bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
2840                                           GFP_ATOMIC);
2841                 rcu_read_unlock();
2842                 if (!bss_ies)
2843                         return false;
2844
2845                 ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
2846                                        false, &bss_elems);
2847                 if (assoc_data->wmm &&
2848                     !elems.wmm_param && bss_elems.wmm_param) {
2849                         elems.wmm_param = bss_elems.wmm_param;
2850                         sdata_info(sdata,
2851                                    "AP bug: WMM param missing from AssocResp\n");
2852                 }
2853
2854                 /*
2855                  * Also check if we requested HT/VHT, otherwise the AP doesn't
2856                  * have to include the IEs in the (re)association response.
2857                  */
2858                 if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
2859                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2860                         elems.ht_cap_elem = bss_elems.ht_cap_elem;
2861                         sdata_info(sdata,
2862                                    "AP bug: HT capability missing from AssocResp\n");
2863                 }
2864                 if (!elems.ht_operation && bss_elems.ht_operation &&
2865                     !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
2866                         elems.ht_operation = bss_elems.ht_operation;
2867                         sdata_info(sdata,
2868                                    "AP bug: HT operation missing from AssocResp\n");
2869                 }
2870                 if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
2871                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2872                         elems.vht_cap_elem = bss_elems.vht_cap_elem;
2873                         sdata_info(sdata,
2874                                    "AP bug: VHT capa missing from AssocResp\n");
2875                 }
2876                 if (!elems.vht_operation && bss_elems.vht_operation &&
2877                     !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
2878                         elems.vht_operation = bss_elems.vht_operation;
2879                         sdata_info(sdata,
2880                                    "AP bug: VHT operation missing from AssocResp\n");
2881                 }
2882         }
2883
2884         /*
2885          * We previously checked these in the beacon/probe response, so
2886          * they should be present here. This is just a safety net.
2887          */
2888         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
2889             (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
2890                 sdata_info(sdata,
2891                            "HT AP is missing WMM params or HT capability/operation\n");
2892                 ret = false;
2893                 goto out;
2894         }
2895
2896         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
2897             (!elems.vht_cap_elem || !elems.vht_operation)) {
2898                 sdata_info(sdata,
2899                            "VHT AP is missing VHT capability/operation\n");
2900                 ret = false;
2901                 goto out;
2902         }
2903
2904         mutex_lock(&sdata->local->sta_mtx);
2905         /*
2906          * station info was already allocated and inserted before
2907          * the association and should be available to us
2908          */
2909         sta = sta_info_get(sdata, cbss->bssid);
2910         if (WARN_ON(!sta)) {
2911                 mutex_unlock(&sdata->local->sta_mtx);
2912                 ret = false;
2913                 goto out;
2914         }
2915
2916         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2917
2918         /* Set up internal HT/VHT capabilities */
2919         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2920                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2921                                                   elems.ht_cap_elem, sta);
2922
2923         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2924                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2925                                                     elems.vht_cap_elem, sta);
2926
2927         /*
2928          * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
2929          * in their association response, so ignore that data for our own
2930          * configuration. If it changed since the last beacon, we'll get the
2931          * next beacon and update then.
2932          */
2933
2934         /*
2935          * If an operating mode notification IE is present, override the
2936          * NSS calculation (that would be done in rate_control_rate_init())
2937          * and use the # of streams from that element.
2938          */
2939         if (elems.opmode_notif &&
2940             !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
2941                 u8 nss;
2942
2943                 nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
2944                 nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
2945                 nss += 1;
2946                 sta->sta.rx_nss = nss;
2947         }
2948
2949         rate_control_rate_init(sta);
2950
2951         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2952                 set_sta_flag(sta, WLAN_STA_MFP);
2953
2954         sta->sta.wme = elems.wmm_param;
2955
2956         err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2957         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2958                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2959         if (err) {
2960                 sdata_info(sdata,
2961                            "failed to move station %pM to desired state\n",
2962                            sta->sta.addr);
2963                 WARN_ON(__sta_info_destroy(sta));
2964                 mutex_unlock(&sdata->local->sta_mtx);
2965                 ret = false;
2966                 goto out;
2967         }
2968
2969         mutex_unlock(&sdata->local->sta_mtx);
2970
2971         /*
2972          * Always handle WMM once after association regardless
2973          * of the first value the AP uses. Setting -1 here has
2974          * that effect because the AP values is an unsigned
2975          * 4-bit value.
2976          */
2977         ifmgd->wmm_last_param_set = -1;
2978
2979         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2980                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2981                                          elems.wmm_param_len);
2982         else
2983                 ieee80211_set_wmm_default(sdata, false);
2984         changed |= BSS_CHANGED_QOS;
2985
2986         /* set AID and assoc capability,
2987          * ieee80211_set_associated() will tell the driver */
2988         bss_conf->aid = aid;
2989         bss_conf->assoc_capability = capab_info;
2990         ieee80211_set_associated(sdata, cbss, changed);
2991
2992         /*
2993          * If we're using 4-addr mode, let the AP know that we're
2994          * doing so, so that it can create the STA VLAN on its side
2995          */
2996         if (ifmgd->use_4addr)
2997                 ieee80211_send_4addr_nullfunc(local, sdata);
2998
2999         /*
3000          * Start timer to probe the connection to the AP now.
3001          * Also start the timer that will detect beacon loss.
3002          */
3003         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3004         ieee80211_sta_reset_beacon_monitor(sdata);
3005
3006         ret = true;
3007  out:
3008         kfree(bss_ies);
3009         return ret;
3010 }
3011
3012 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
3013                                          struct ieee80211_mgmt *mgmt,
3014                                          size_t len)
3015 {
3016         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3017         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
3018         u16 capab_info, status_code, aid;
3019         struct ieee802_11_elems elems;
3020         int ac, uapsd_queues = -1;
3021         u8 *pos;
3022         bool reassoc;
3023         struct cfg80211_bss *bss;
3024
3025         sdata_assert_lock(sdata);
3026
3027         if (!assoc_data)
3028                 return;
3029         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3030                 return;
3031
3032         /*
3033          * AssocResp and ReassocResp have identical structure, so process both
3034          * of them in this function.
3035          */
3036
3037         if (len < 24 + 6)
3038                 return;
3039
3040         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
3041         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
3042         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
3043         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
3044
3045         sdata_info(sdata,
3046                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
3047                    reassoc ? "Rea" : "A", mgmt->sa,
3048                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
3049
3050         pos = mgmt->u.assoc_resp.variable;
3051         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
3052
3053         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3054             elems.timeout_int &&
3055             elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
3056                 u32 tu, ms;
3057                 tu = le32_to_cpu(elems.timeout_int->value);
3058                 ms = tu * 1024 / 1000;
3059                 sdata_info(sdata,
3060                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
3061                            mgmt->sa, tu, ms);
3062                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3063                 assoc_data->timeout_started = true;
3064                 if (ms > IEEE80211_ASSOC_TIMEOUT)
3065                         run_again(sdata, assoc_data->timeout);
3066                 return;
3067         }
3068
3069         bss = assoc_data->bss;
3070
3071         if (status_code != WLAN_STATUS_SUCCESS) {
3072                 sdata_info(sdata, "%pM denied association (code=%d)\n",
3073                            mgmt->sa, status_code);
3074                 ieee80211_destroy_assoc_data(sdata, false);
3075         } else {
3076                 if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
3077                         /* oops -- internal error -- send timeout for now */
3078                         ieee80211_destroy_assoc_data(sdata, false);
3079                         cfg80211_assoc_timeout(sdata->dev, bss);
3080                         return;
3081                 }
3082                 sdata_info(sdata, "associated\n");
3083
3084                 /*
3085                  * destroy assoc_data afterwards, as otherwise an idle
3086                  * recalc after assoc_data is NULL but before associated
3087                  * is set can cause the interface to go idle
3088                  */
3089                 ieee80211_destroy_assoc_data(sdata, true);
3090
3091                 /* get uapsd queues configuration */
3092                 uapsd_queues = 0;
3093                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
3094                         if (sdata->tx_conf[ac].uapsd)
3095                                 uapsd_queues |= BIT(ac);
3096         }
3097
3098         cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
3099 }
3100
3101 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
3102                                   struct ieee80211_mgmt *mgmt, size_t len,
3103                                   struct ieee80211_rx_status *rx_status,
3104                                   struct ieee802_11_elems *elems)
3105 {
3106         struct ieee80211_local *local = sdata->local;
3107         struct ieee80211_bss *bss;
3108         struct ieee80211_channel *channel;
3109
3110         sdata_assert_lock(sdata);
3111
3112         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
3113         if (!channel)
3114                 return;
3115
3116         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3117                                         channel);
3118         if (bss) {
3119                 sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3120                 ieee80211_rx_bss_put(local, bss);
3121         }
3122 }
3123
3124
3125 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
3126                                          struct sk_buff *skb)
3127 {
3128         struct ieee80211_mgmt *mgmt = (void *)skb->data;
3129         struct ieee80211_if_managed *ifmgd;
3130         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
3131         size_t baselen, len = skb->len;
3132         struct ieee802_11_elems elems;
3133
3134         ifmgd = &sdata->u.mgd;
3135
3136         sdata_assert_lock(sdata);
3137
3138         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3139                 return; /* ignore ProbeResp to foreign address */
3140
3141         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
3142         if (baselen > len)
3143                 return;
3144
3145         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3146                                false, &elems);
3147
3148         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3149
3150         if (ifmgd->associated &&
3151             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3152                 ieee80211_reset_ap_probe(sdata);
3153
3154         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
3155             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
3156                 /* got probe response, continue with auth */
3157                 sdata_info(sdata, "direct probe responded\n");
3158                 ifmgd->auth_data->tries = 0;
3159                 ifmgd->auth_data->timeout = jiffies;
3160                 ifmgd->auth_data->timeout_started = true;
3161                 run_again(sdata, ifmgd->auth_data->timeout);
3162         }
3163 }
3164
3165 /*
3166  * This is the canonical list of information elements we care about,
3167  * the filter code also gives us all changes to the Microsoft OUI
3168  * (00:50:F2) vendor IE which is used for WMM which we need to track,
3169  * as well as the DTPC IE (part of the Cisco OUI) used for signaling
3170  * changes to requested client power.
3171  *
3172  * We implement beacon filtering in software since that means we can
3173  * avoid processing the frame here and in cfg80211, and userspace
3174  * will not be able to tell whether the hardware supports it or not.
3175  *
3176  * XXX: This list needs to be dynamic -- userspace needs to be able to
3177  *      add items it requires. It also needs to be able to tell us to
3178  *      look out for other vendor IEs.
3179  */
3180 static const u64 care_about_ies =
3181         (1ULL << WLAN_EID_COUNTRY) |
3182         (1ULL << WLAN_EID_ERP_INFO) |
3183         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
3184         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
3185         (1ULL << WLAN_EID_HT_CAPABILITY) |
3186         (1ULL << WLAN_EID_HT_OPERATION);
3187
3188 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
3189                                      struct ieee80211_mgmt *mgmt, size_t len,
3190                                      struct ieee80211_rx_status *rx_status)
3191 {
3192         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3193         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3194         size_t baselen;
3195         struct ieee802_11_elems elems;
3196         struct ieee80211_local *local = sdata->local;
3197         struct ieee80211_chanctx_conf *chanctx_conf;
3198         struct ieee80211_channel *chan;
3199         struct sta_info *sta;
3200         u32 changed = 0;
3201         bool erp_valid;
3202         u8 erp_value = 0;
3203         u32 ncrc;
3204         u8 *bssid;
3205         u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3206
3207         sdata_assert_lock(sdata);
3208
3209         /* Process beacon from the current BSS */
3210         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
3211         if (baselen > len)
3212                 return;
3213
3214         rcu_read_lock();
3215         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3216         if (!chanctx_conf) {
3217                 rcu_read_unlock();
3218                 return;
3219         }
3220
3221         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
3222                 rcu_read_unlock();
3223                 return;
3224         }
3225         chan = chanctx_conf->def.chan;
3226         rcu_read_unlock();
3227
3228         if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3229             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
3230                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
3231                                        len - baselen, false, &elems);
3232
3233                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3234                 if (elems.tim && !elems.parse_error) {
3235                         const struct ieee80211_tim_ie *tim_ie = elems.tim;
3236                         ifmgd->dtim_period = tim_ie->dtim_period;
3237                 }
3238                 ifmgd->have_beacon = true;
3239                 ifmgd->assoc_data->need_beacon = false;
3240                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3241                         sdata->vif.bss_conf.sync_tsf =
3242                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3243                         sdata->vif.bss_conf.sync_device_ts =
3244                                 rx_status->device_timestamp;
3245                         if (elems.tim)
3246                                 sdata->vif.bss_conf.sync_dtim_count =
3247                                         elems.tim->dtim_count;
3248                         else
3249                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3250                 }
3251                 /* continue assoc process */
3252                 ifmgd->assoc_data->timeout = jiffies;
3253                 ifmgd->assoc_data->timeout_started = true;
3254                 run_again(sdata, ifmgd->assoc_data->timeout);
3255                 return;
3256         }
3257
3258         if (!ifmgd->associated ||
3259             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3260                 return;
3261         bssid = ifmgd->associated->bssid;
3262
3263         /* Track average RSSI from the Beacon frames of the current AP */
3264         ifmgd->last_beacon_signal = rx_status->signal;
3265         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
3266                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3267                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
3268                 ifmgd->last_cqm_event_signal = 0;
3269                 ifmgd->count_beacon_signal = 1;
3270                 ifmgd->last_ave_beacon_signal = 0;
3271         } else {
3272                 ifmgd->ave_beacon_signal =
3273                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
3274                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
3275                          ifmgd->ave_beacon_signal) / 16;
3276                 ifmgd->count_beacon_signal++;
3277         }
3278
3279         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
3280             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3281                 int sig = ifmgd->ave_beacon_signal;
3282                 int last_sig = ifmgd->last_ave_beacon_signal;
3283
3284                 /*
3285                  * if signal crosses either of the boundaries, invoke callback
3286                  * with appropriate parameters
3287                  */
3288                 if (sig > ifmgd->rssi_max_thold &&
3289                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
3290                         ifmgd->last_ave_beacon_signal = sig;
3291                         drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
3292                 } else if (sig < ifmgd->rssi_min_thold &&
3293                            (last_sig >= ifmgd->rssi_max_thold ||
3294                            last_sig == 0)) {
3295                         ifmgd->last_ave_beacon_signal = sig;
3296                         drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
3297                 }
3298         }
3299
3300         if (bss_conf->cqm_rssi_thold &&
3301             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3302             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3303                 int sig = ifmgd->ave_beacon_signal / 16;
3304                 int last_event = ifmgd->last_cqm_event_signal;
3305                 int thold = bss_conf->cqm_rssi_thold;
3306                 int hyst = bss_conf->cqm_rssi_hyst;
3307                 if (sig < thold &&
3308                     (last_event == 0 || sig < last_event - hyst)) {
3309                         ifmgd->last_cqm_event_signal = sig;
3310                         ieee80211_cqm_rssi_notify(
3311                                 &sdata->vif,
3312                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
3313                                 GFP_KERNEL);
3314                 } else if (sig > thold &&
3315                            (last_event == 0 || sig > last_event + hyst)) {
3316                         ifmgd->last_cqm_event_signal = sig;
3317                         ieee80211_cqm_rssi_notify(
3318                                 &sdata->vif,
3319                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
3320                                 GFP_KERNEL);
3321                 }
3322         }
3323
3324         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
3325                 mlme_dbg_ratelimited(sdata,
3326                                      "cancelling AP probe due to a received beacon\n");
3327                 ieee80211_reset_ap_probe(sdata);
3328         }
3329
3330         /*
3331          * Push the beacon loss detection into the future since
3332          * we are processing a beacon from the AP just now.
3333          */
3334         ieee80211_sta_reset_beacon_monitor(sdata);
3335
3336         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
3337         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3338                                           len - baselen, false, &elems,
3339                                           care_about_ies, ncrc);
3340
3341         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
3342                 bool directed_tim = ieee80211_check_tim(elems.tim,
3343                                                         elems.tim_len,
3344                                                         ifmgd->aid);
3345                 if (directed_tim) {
3346                         if (local->hw.conf.dynamic_ps_timeout > 0) {
3347                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
3348                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
3349                                         ieee80211_hw_config(local,
3350                                                             IEEE80211_CONF_CHANGE_PS);
3351                                 }
3352                                 ieee80211_send_nullfunc(local, sdata, 0);
3353                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
3354                                 local->pspolling = true;
3355
3356                                 /*
3357                                  * Here is assumed that the driver will be
3358                                  * able to send ps-poll frame and receive a
3359                                  * response even though power save mode is
3360                                  * enabled, but some drivers might require
3361                                  * to disable power save here. This needs
3362                                  * to be investigated.
3363                                  */
3364                                 ieee80211_send_pspoll(local, sdata);
3365                         }
3366                 }
3367         }
3368
3369         if (sdata->vif.p2p) {
3370                 struct ieee80211_p2p_noa_attr noa = {};
3371                 int ret;
3372
3373                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
3374                                             len - baselen,
3375                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3376                                             (u8 *) &noa, sizeof(noa));
3377                 if (ret >= 2) {
3378                         if (sdata->u.mgd.p2p_noa_index != noa.index) {
3379                                 /* valid noa_attr and index changed */
3380                                 sdata->u.mgd.p2p_noa_index = noa.index;
3381                                 memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
3382                                 changed |= BSS_CHANGED_P2P_PS;
3383                                 /*
3384                                  * make sure we update all information, the CRC
3385                                  * mechanism doesn't look at P2P attributes.
3386                                  */
3387                                 ifmgd->beacon_crc_valid = false;
3388                         }
3389                 } else if (sdata->u.mgd.p2p_noa_index != -1) {
3390                         /* noa_attr not found and we had valid noa_attr before */
3391                         sdata->u.mgd.p2p_noa_index = -1;
3392                         memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
3393                         changed |= BSS_CHANGED_P2P_PS;
3394                         ifmgd->beacon_crc_valid = false;
3395                 }
3396         }
3397
3398         if (ifmgd->csa_waiting_bcn)
3399                 ieee80211_chswitch_post_beacon(sdata);
3400
3401         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3402                 return;
3403         ifmgd->beacon_crc = ncrc;
3404         ifmgd->beacon_crc_valid = true;
3405
3406         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3407
3408         ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3409                                          rx_status->device_timestamp,
3410                                          &elems, true);
3411
3412         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
3413             ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3414                                      elems.wmm_param_len))
3415                 changed |= BSS_CHANGED_QOS;
3416
3417         /*
3418          * If we haven't had a beacon before, tell the driver about the
3419          * DTIM period (and beacon timing if desired) now.
3420          */
3421         if (!ifmgd->have_beacon) {
3422                 /* a few bogus AP send dtim_period = 0 or no TIM IE */
3423                 if (elems.tim)
3424                         bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
3425                 else
3426                         bss_conf->dtim_period = 1;
3427
3428                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
3429                         sdata->vif.bss_conf.sync_tsf =
3430                                 le64_to_cpu(mgmt->u.beacon.timestamp);
3431                         sdata->vif.bss_conf.sync_device_ts =
3432                                 rx_status->device_timestamp;
3433                         if (elems.tim)
3434                                 sdata->vif.bss_conf.sync_dtim_count =
3435                                         elems.tim->dtim_count;
3436                         else
3437                                 sdata->vif.bss_conf.sync_dtim_count = 0;
3438                 }
3439
3440                 changed |= BSS_CHANGED_BEACON_INFO;
3441                 ifmgd->have_beacon = true;
3442
3443                 mutex_lock(&local->iflist_mtx);
3444                 ieee80211_recalc_ps(local, -1);
3445                 mutex_unlock(&local->iflist_mtx);
3446
3447                 ieee80211_recalc_ps_vif(sdata);
3448         }
3449
3450         if (elems.erp_info) {
3451                 erp_valid = true;
3452                 erp_value = elems.erp_info[0];
3453         } else {
3454                 erp_valid = false;
3455         }
3456         changed |= ieee80211_handle_bss_capability(sdata,
3457                         le16_to_cpu(mgmt->u.beacon.capab_info),
3458                         erp_valid, erp_value);
3459
3460         mutex_lock(&local->sta_mtx);
3461         sta = sta_info_get(sdata, bssid);
3462
3463         if (ieee80211_config_bw(sdata, sta,
3464                                 elems.ht_cap_elem, elems.ht_operation,
3465                                 elems.vht_operation, bssid, &changed)) {
3466                 mutex_unlock(&local->sta_mtx);
3467                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3468                                        WLAN_REASON_DEAUTH_LEAVING,
3469                                        true, deauth_buf);
3470                 cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
3471                                       sizeof(deauth_buf));
3472                 return;
3473         }
3474
3475         if (sta && elems.opmode_notif)
3476                 ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3477                                             rx_status->band, true);
3478         mutex_unlock(&local->sta_mtx);
3479
3480         changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
3481                                                elems.country_elem,
3482                                                elems.country_elem_len,
3483                                                elems.pwr_constr_elem,
3484                                                elems.cisco_dtpc_elem);
3485
3486         ieee80211_bss_info_change_notify(sdata, changed);
3487 }
3488
3489 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
3490                                   struct sk_buff *skb)
3491 {
3492         struct ieee80211_rx_status *rx_status;
3493         struct ieee80211_mgmt *mgmt;
3494         u16 fc;
3495         struct ieee802_11_elems elems;
3496         int ies_len;
3497
3498         rx_status = (struct ieee80211_rx_status *) skb->cb;
3499         mgmt = (struct ieee80211_mgmt *) skb->data;
3500         fc = le16_to_cpu(mgmt->frame_control);
3501
3502         sdata_lock(sdata);
3503
3504         switch (fc & IEEE80211_FCTL_STYPE) {
3505         case IEEE80211_STYPE_BEACON:
3506                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
3507                 break;
3508         case IEEE80211_STYPE_PROBE_RESP:
3509                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
3510                 break;
3511         case IEEE80211_STYPE_AUTH:
3512                 ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
3513                 break;
3514         case IEEE80211_STYPE_DEAUTH:
3515                 ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
3516                 break;
3517         case IEEE80211_STYPE_DISASSOC:
3518                 ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
3519                 break;
3520         case IEEE80211_STYPE_ASSOC_RESP:
3521         case IEEE80211_STYPE_REASSOC_RESP:
3522                 ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
3523                 break;
3524         case IEEE80211_STYPE_ACTION:
3525                 if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3526                         ies_len = skb->len -
3527                                   offsetof(struct ieee80211_mgmt,
3528                                            u.action.u.chan_switch.variable);
3529
3530                         if (ies_len < 0)
3531                                 break;
3532
3533                         ieee802_11_parse_elems(
3534                                 mgmt->u.action.u.chan_switch.variable,
3535                                 ies_len, true, &elems);
3536
3537                         if (elems.parse_error)
3538                                 break;
3539
3540                         ieee80211_sta_process_chanswitch(sdata,
3541                                                  rx_status->mactime,
3542                                                  rx_status->device_timestamp,
3543                                                  &elems, false);
3544                 } else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
3545                         ies_len = skb->len -
3546                                   offsetof(struct ieee80211_mgmt,
3547                                            u.action.u.ext_chan_switch.variable);
3548
3549                         if (ies_len < 0)
3550                                 break;
3551
3552                         ieee802_11_parse_elems(
3553                                 mgmt->u.action.u.ext_chan_switch.variable,
3554                                 ies_len, true, &elems);
3555
3556                         if (elems.parse_error)
3557                                 break;
3558
3559                         /* for the handling code pretend this was also an IE */
3560                         elems.ext_chansw_ie =
3561                                 &mgmt->u.action.u.ext_chan_switch.data;
3562
3563                         ieee80211_sta_process_chanswitch(sdata,
3564                                                  rx_status->mactime,
3565                                                  rx_status->device_timestamp,
3566                                                  &elems, false);
3567                 }
3568                 break;
3569         }
3570         sdata_unlock(sdata);
3571 }
3572
3573 static void ieee80211_sta_timer(unsigned long data)
3574 {
3575         struct ieee80211_sub_if_data *sdata =
3576                 (struct ieee80211_sub_if_data *) data;
3577
3578         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3579 }
3580
3581 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3582                                           u8 *bssid, u8 reason, bool tx)
3583 {
3584         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3585
3586         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3587                                tx, frame_buf);
3588
3589         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3590                               IEEE80211_DEAUTH_FRAME_LEN);
3591 }
3592
3593 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
3594 {
3595         struct ieee80211_local *local = sdata->local;
3596         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3597         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3598         u32 tx_flags = 0;
3599
3600         sdata_assert_lock(sdata);
3601
3602         if (WARN_ON_ONCE(!auth_data))
3603                 return -EINVAL;
3604
3605         auth_data->tries++;
3606
3607         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
3608                 sdata_info(sdata, "authentication with %pM timed out\n",
3609                            auth_data->bss->bssid);
3610
3611                 /*
3612                  * Most likely AP is not in the range so remove the
3613                  * bss struct for that AP.
3614                  */
3615                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
3616
3617                 return -ETIMEDOUT;
3618         }
3619
3620         drv_mgd_prepare_tx(local, sdata);
3621
3622         if (auth_data->bss->proberesp_ies) {
3623                 u16 trans = 1;
3624                 u16 status = 0;
3625
3626                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
3627                            auth_data->bss->bssid, auth_data->tries,
3628                            IEEE80211_AUTH_MAX_TRIES);
3629
3630                 auth_data->expected_transaction = 2;
3631
3632                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
3633                         trans = auth_data->sae_trans;
3634                         status = auth_data->sae_status;
3635                         auth_data->expected_transaction = trans;
3636                 }
3637
3638                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3639                         tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
3640                                    IEEE80211_TX_INTFL_MLME_CONN_TX;
3641
3642                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
3643                                     auth_data->data, auth_data->data_len,
3644                                     auth_data->bss->bssid,
3645                                     auth_data->bss->bssid, NULL, 0, 0,
3646                                     tx_flags);
3647         } else {
3648                 const u8 *ssidie;
3649
3650                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
3651                            auth_data->bss->bssid, auth_data->tries,
3652                            IEEE80211_AUTH_MAX_TRIES);
3653
3654                 rcu_read_lock();
3655                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3656                 if (!ssidie) {
3657                         rcu_read_unlock();
3658                         return -EINVAL;
3659                 }
3660                 /*
3661                  * Direct probe is sent to broadcast address as some APs
3662                  * will not answer to direct packet in unassociated state.
3663                  */
3664                 ieee80211_send_probe_req(sdata, sdata->vif.addr, NULL,
3665                                          ssidie + 2, ssidie[1],
3666                                          NULL, 0, (u32) -1, true, 0,
3667                                          auth_data->bss->channel, false);
3668                 rcu_read_unlock();
3669         }
3670
3671         if (tx_flags == 0) {
3672                 auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3673                 auth_data->timeout_started = true;
3674                 run_again(sdata, auth_data->timeout);
3675         } else {
3676                 auth_data->timeout =
3677                         round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
3678                 auth_data->timeout_started = true;
3679                 run_again(sdata, auth_data->timeout);
3680         }
3681
3682         return 0;
3683 }
3684
3685 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
3686 {
3687         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
3688         struct ieee80211_local *local = sdata->local;
3689
3690         sdata_assert_lock(sdata);
3691
3692         assoc_data->tries++;
3693         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
3694                 sdata_info(sdata, "association with %pM timed out\n",
3695                            assoc_data->bss->bssid);
3696
3697                 /*
3698                  * Most likely AP is not in the range so remove the
3699                  * bss struct for that AP.
3700                  */
3701                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
3702
3703                 return -ETIMEDOUT;
3704         }
3705
3706         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
3707                    assoc_data->bss->bssid, assoc_data->tries,
3708                    IEEE80211_ASSOC_MAX_TRIES);
3709         ieee80211_send_assoc(sdata);
3710
3711         if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
3712                 assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3713                 assoc_data->timeout_started = true;
3714                 run_again(sdata, assoc_data->timeout);
3715         } else {
3716                 assoc_data->timeout =
3717                         round_jiffies_up(jiffies +
3718                                          IEEE80211_ASSOC_TIMEOUT_LONG);
3719                 assoc_data->timeout_started = true;
3720                 run_again(sdata, assoc_data->timeout);
3721         }
3722
3723         return 0;
3724 }
3725
3726 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
3727                                   __le16 fc, bool acked)
3728 {
3729         struct ieee80211_local *local = sdata->local;
3730
3731         sdata->u.mgd.status_fc = fc;
3732         sdata->u.mgd.status_acked = acked;
3733         sdata->u.mgd.status_received = true;
3734
3735         ieee80211_queue_work(&local->hw, &sdata->work);
3736 }
3737
3738 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
3739 {
3740         struct ieee80211_local *local = sdata->local;
3741         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3742
3743         sdata_lock(sdata);
3744
3745         if (ifmgd->status_received) {
3746                 __le16 fc = ifmgd->status_fc;
3747                 bool status_acked = ifmgd->status_acked;
3748
3749                 ifmgd->status_received = false;
3750                 if (ifmgd->auth_data &&
3751                     (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
3752                         if (status_acked) {
3753                                 ifmgd->auth_data->timeout =
3754                                         jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3755                                 run_again(sdata, ifmgd->auth_data->timeout);
3756                         } else {
3757                                 ifmgd->auth_data->timeout = jiffies - 1;
3758                         }
3759                         ifmgd->auth_data->timeout_started = true;
3760                 } else if (ifmgd->assoc_data &&
3761                            (ieee80211_is_assoc_req(fc) ||
3762                             ieee80211_is_reassoc_req(fc))) {
3763                         if (status_acked) {
3764                                 ifmgd->assoc_data->timeout =
3765                                         jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3766                                 run_again(sdata, ifmgd->assoc_data->timeout);
3767                         } else {
3768                                 ifmgd->assoc_data->timeout = jiffies - 1;
3769                         }
3770                         ifmgd->assoc_data->timeout_started = true;
3771                 }
3772         }
3773
3774         if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
3775             time_after(jiffies, ifmgd->auth_data->timeout)) {
3776                 if (ifmgd->auth_data->done) {
3777                         /*
3778                          * ok ... we waited for assoc but userspace didn't,
3779                          * so let's just kill the auth data
3780                          */
3781                         ieee80211_destroy_auth_data(sdata, false);
3782                 } else if (ieee80211_probe_auth(sdata)) {
3783                         u8 bssid[ETH_ALEN];
3784
3785                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
3786
3787                         ieee80211_destroy_auth_data(sdata, false);
3788
3789                         cfg80211_auth_timeout(sdata->dev, bssid);
3790                 }
3791         } else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3792                 run_again(sdata, ifmgd->auth_data->timeout);
3793
3794         if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
3795             time_after(jiffies, ifmgd->assoc_data->timeout)) {
3796                 if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
3797                     ieee80211_do_assoc(sdata)) {
3798                         struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3799
3800                         ieee80211_destroy_assoc_data(sdata, false);
3801                         cfg80211_assoc_timeout(sdata->dev, bss);
3802                 }
3803         } else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3804                 run_again(sdata, ifmgd->assoc_data->timeout);
3805
3806         if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
3807             ifmgd->associated) {
3808                 u8 bssid[ETH_ALEN];
3809                 int max_tries;
3810
3811                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3812
3813                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3814                         max_tries = max_nullfunc_tries;
3815                 else
3816                         max_tries = max_probe_tries;
3817
3818                 /* ACK received for nullfunc probing frame */
3819                 if (!ifmgd->probe_send_count)
3820                         ieee80211_reset_ap_probe(sdata);
3821                 else if (ifmgd->nullfunc_failed) {
3822                         if (ifmgd->probe_send_count < max_tries) {
3823                                 mlme_dbg(sdata,
3824                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3825                                          bssid, ifmgd->probe_send_count,
3826                                          max_tries);
3827                                 ieee80211_mgd_probe_ap_send(sdata);
3828                         } else {
3829                                 mlme_dbg(sdata,
3830                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3831                                          bssid);
3832                                 ieee80211_sta_connection_lost(sdata, bssid,
3833                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
3834                                         false);
3835                         }
3836                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3837                         run_again(sdata, ifmgd->probe_timeout);
3838                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3839                         mlme_dbg(sdata,
3840                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3841                                  bssid, probe_wait_ms);
3842                         ieee80211_sta_connection_lost(sdata, bssid,
3843                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3844                 } else if (ifmgd->probe_send_count < max_tries) {
3845                         mlme_dbg(sdata,
3846                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3847                                  bssid, probe_wait_ms,
3848                                  ifmgd->probe_send_count, max_tries);
3849                         ieee80211_mgd_probe_ap_send(sdata);
3850                 } else {
3851                         /*
3852                          * We actually lost the connection ... or did we?
3853                          * Let's make sure!
3854                          */
3855                         wiphy_debug(local->hw.wiphy,
3856                                     "%s: No probe response from AP %pM"
3857                                     " after %dms, disconnecting.\n",
3858                                     sdata->name,
3859                                     bssid, probe_wait_ms);
3860
3861                         ieee80211_sta_connection_lost(sdata, bssid,
3862                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3863                 }
3864         }
3865
3866         sdata_unlock(sdata);
3867 }
3868
3869 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3870 {
3871         struct ieee80211_sub_if_data *sdata =
3872                 (struct ieee80211_sub_if_data *) data;
3873         struct ieee80211_local *local = sdata->local;
3874         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3875
3876         if (local->quiescing)
3877                 return;
3878
3879         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3880                 return;
3881
3882         sdata->u.mgd.connection_loss = false;
3883         ieee80211_queue_work(&sdata->local->hw,
3884                              &sdata->u.mgd.beacon_connection_loss_work);
3885 }
3886
3887 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3888 {
3889         struct ieee80211_sub_if_data *sdata =
3890                 (struct ieee80211_sub_if_data *) data;
3891         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3892         struct ieee80211_local *local = sdata->local;
3893
3894         if (local->quiescing)
3895                 return;
3896
3897         if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
3898                 return;
3899
3900         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3901 }
3902
3903 static void ieee80211_sta_monitor_work(struct work_struct *work)
3904 {
3905         struct ieee80211_sub_if_data *sdata =
3906                 container_of(work, struct ieee80211_sub_if_data,
3907                              u.mgd.monitor_work);
3908
3909         ieee80211_mgd_probe_ap(sdata, false);
3910 }
3911
3912 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3913 {
3914         u32 flags;
3915
3916         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3917                 __ieee80211_stop_poll(sdata);
3918
3919                 /* let's probe the connection once */
3920                 flags = sdata->local->hw.flags;
3921                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3922                         ieee80211_queue_work(&sdata->local->hw,
3923                                              &sdata->u.mgd.monitor_work);
3924                 /* and do all the other regular work too */
3925                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3926         }
3927 }
3928
3929 #ifdef CONFIG_PM
3930 void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
3931 {
3932         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3933         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3934
3935         sdata_lock(sdata);
3936
3937         if (ifmgd->auth_data || ifmgd->assoc_data) {
3938                 const u8 *bssid = ifmgd->auth_data ?
3939                                 ifmgd->auth_data->bss->bssid :
3940                                 ifmgd->assoc_data->bss->bssid;
3941
3942                 /*
3943                  * If we are trying to authenticate / associate while suspending,
3944                  * cfg80211 won't know and won't actually abort those attempts,
3945                  * thus we need to do that ourselves.
3946                  */
3947                 ieee80211_send_deauth_disassoc(sdata, bssid,
3948                                                IEEE80211_STYPE_DEAUTH,
3949                                                WLAN_REASON_DEAUTH_LEAVING,
3950                                                false, frame_buf);
3951                 if (ifmgd->assoc_data)
3952                         ieee80211_destroy_assoc_data(sdata, false);
3953                 if (ifmgd->auth_data)
3954                         ieee80211_destroy_auth_data(sdata, false);
3955                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
3956                                       IEEE80211_DEAUTH_FRAME_LEN);
3957         }
3958
3959         sdata_unlock(sdata);
3960 }
3961
3962 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3963 {
3964         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3965
3966         sdata_lock(sdata);
3967         if (!ifmgd->associated) {
3968                 sdata_unlock(sdata);
3969                 return;
3970         }
3971
3972         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3973                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3974                 mlme_dbg(sdata, "driver requested disconnect after resume\n");
3975                 ieee80211_sta_connection_lost(sdata,
3976                                               ifmgd->associated->bssid,
3977                                               WLAN_REASON_UNSPECIFIED,
3978                                               true);
3979                 sdata_unlock(sdata);
3980                 return;
3981         }
3982         sdata_unlock(sdata);
3983 }
3984 #endif
3985
3986 /* interface setup */
3987 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3988 {
3989         struct ieee80211_if_managed *ifmgd;
3990
3991         ifmgd = &sdata->u.mgd;
3992         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3993         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3994         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3995                   ieee80211_beacon_connection_loss_work);
3996         INIT_WORK(&ifmgd->csa_connection_drop_work,
3997                   ieee80211_csa_connection_drop_work);
3998         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3999         INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
4000                           ieee80211_tdls_peer_del_work);
4001         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
4002                     (unsigned long) sdata);
4003         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
4004                     (unsigned long) sdata);
4005         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
4006                     (unsigned long) sdata);
4007         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
4008                     (unsigned long) sdata);
4009         INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
4010                           ieee80211_sta_handle_tspec_ac_params_wk);
4011
4012         ifmgd->flags = 0;
4013         ifmgd->powersave = sdata->wdev.ps;
4014         ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
4015         ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
4016         ifmgd->p2p_noa_index = -1;
4017
4018         if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4019                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
4020         else
4021                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
4022
4023         /* Setup TDLS data */
4024         spin_lock_init(&ifmgd->teardown_lock);
4025         ifmgd->teardown_skb = NULL;
4026         ifmgd->orig_teardown_skb = NULL;
4027 }
4028
4029 /* scan finished notification */
4030 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
4031 {
4032         struct ieee80211_sub_if_data *sdata;
4033
4034         /* Restart STA timers */
4035         rcu_read_lock();
4036         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4037                 if (ieee80211_sdata_running(sdata))
4038                         ieee80211_restart_sta_timer(sdata);
4039         }
4040         rcu_read_unlock();
4041 }
4042
4043 int ieee80211_max_network_latency(struct notifier_block *nb,
4044                                   unsigned long data, void *dummy)
4045 {
4046         s32 latency_usec = (s32) data;
4047         struct ieee80211_local *local =
4048                 container_of(nb, struct ieee80211_local,
4049                              network_latency_notifier);
4050
4051         mutex_lock(&local->iflist_mtx);
4052         ieee80211_recalc_ps(local, latency_usec);
4053         mutex_unlock(&local->iflist_mtx);
4054
4055         return NOTIFY_OK;
4056 }
4057
4058 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
4059                                      struct cfg80211_bss *cbss)
4060 {
4061         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4062         const u8 *ht_cap_ie, *vht_cap_ie;
4063         const struct ieee80211_ht_cap *ht_cap;
4064         const struct ieee80211_vht_cap *vht_cap;
4065         u8 chains = 1;
4066
4067         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
4068                 return chains;
4069
4070         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4071         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
4072                 ht_cap = (void *)(ht_cap_ie + 2);
4073                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
4074                 /*
4075                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
4076                  *       "Tx Unequal Modulation Supported" fields.
4077                  */
4078         }
4079
4080         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
4081                 return chains;
4082
4083         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4084         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
4085                 u8 nss;
4086                 u16 tx_mcs_map;
4087
4088                 vht_cap = (void *)(vht_cap_ie + 2);
4089                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
4090                 for (nss = 8; nss > 0; nss--) {
4091                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
4092                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
4093                                 break;
4094                 }
4095                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
4096                 chains = max(chains, nss);
4097         }
4098
4099         return chains;
4100 }
4101
4102 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
4103                                   struct cfg80211_bss *cbss)
4104 {
4105         struct ieee80211_local *local = sdata->local;
4106         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4107         const struct ieee80211_ht_cap *ht_cap = NULL;
4108         const struct ieee80211_ht_operation *ht_oper = NULL;
4109         const struct ieee80211_vht_operation *vht_oper = NULL;
4110         struct ieee80211_supported_band *sband;
4111         struct cfg80211_chan_def chandef;
4112         int ret;
4113
4114         sband = local->hw.wiphy->bands[cbss->channel->band];
4115
4116         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
4117                           IEEE80211_STA_DISABLE_80P80MHZ |
4118                           IEEE80211_STA_DISABLE_160MHZ);
4119
4120         rcu_read_lock();
4121
4122         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
4123             sband->ht_cap.ht_supported) {
4124                 const u8 *ht_oper_ie, *ht_cap_ie;
4125
4126                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4127                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
4128                         ht_oper = (void *)(ht_oper_ie + 2);
4129
4130                 ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
4131                 if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
4132                         ht_cap = (void *)(ht_cap_ie + 2);
4133
4134                 if (!ht_cap) {
4135                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4136                         ht_oper = NULL;
4137                 }
4138         }
4139
4140         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
4141             sband->vht_cap.vht_supported) {
4142                 const u8 *vht_oper_ie, *vht_cap;
4143
4144                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
4145                                                    WLAN_EID_VHT_OPERATION);
4146                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
4147                         vht_oper = (void *)(vht_oper_ie + 2);
4148                 if (vht_oper && !ht_oper) {
4149                         vht_oper = NULL;
4150                         sdata_info(sdata,
4151                                    "AP advertised VHT without HT, disabling both\n");
4152                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4153                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4154                 }
4155
4156                 vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
4157                 if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
4158                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4159                         vht_oper = NULL;
4160                 }
4161         }
4162
4163         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
4164                                                      cbss->channel,
4165                                                      ht_cap, ht_oper, vht_oper,
4166                                                      &chandef, false);
4167
4168         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
4169                                       local->rx_chains);
4170
4171         rcu_read_unlock();
4172
4173         /* will change later if needed */
4174         sdata->smps_mode = IEEE80211_SMPS_OFF;
4175
4176         mutex_lock(&local->mtx);
4177         /*
4178          * If this fails (possibly due to channel context sharing
4179          * on incompatible channels, e.g. 80+80 and 160 sharing the
4180          * same control channel) try to use a smaller bandwidth.
4181          */
4182         ret = ieee80211_vif_use_channel(sdata, &chandef,
4183                                         IEEE80211_CHANCTX_SHARED);
4184
4185         /* don't downgrade for 5 and 10 MHz channels, though. */
4186         if (chandef.width == NL80211_CHAN_WIDTH_5 ||
4187             chandef.width == NL80211_CHAN_WIDTH_10)
4188                 goto out;
4189
4190         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4191                 ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4192                 ret = ieee80211_vif_use_channel(sdata, &chandef,
4193                                                 IEEE80211_CHANCTX_SHARED);
4194         }
4195  out:
4196         mutex_unlock(&local->mtx);
4197         return ret;
4198 }
4199
4200 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4201                                      struct cfg80211_bss *cbss, bool assoc)
4202 {
4203         struct ieee80211_local *local = sdata->local;
4204         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4205         struct ieee80211_bss *bss = (void *)cbss->priv;
4206         struct sta_info *new_sta = NULL;
4207         struct ieee80211_supported_band *sband;
4208         struct ieee80211_sta_ht_cap sta_ht_cap;
4209         bool have_sta = false, is_override = false;
4210         int err;
4211
4212         sband = local->hw.wiphy->bands[cbss->channel->band];
4213
4214         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
4215                 return -EINVAL;
4216
4217         if (assoc) {
4218                 rcu_read_lock();
4219                 have_sta = sta_info_get(sdata, cbss->bssid);
4220                 rcu_read_unlock();
4221         }
4222
4223         if (!have_sta) {
4224                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
4225                 if (!new_sta)
4226                         return -ENOMEM;
4227         }
4228
4229         memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
4230         ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
4231
4232         is_override = (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) !=
4233                       (sband->ht_cap.cap &
4234                        IEEE80211_HT_CAP_SUP_WIDTH_20_40);
4235
4236         if (new_sta || is_override) {
4237                 err = ieee80211_prep_channel(sdata, cbss);
4238                 if (err) {
4239                         if (new_sta)
4240                                 sta_info_free(local, new_sta);
4241                         return -EINVAL;
4242                 }
4243         }
4244
4245         if (new_sta) {
4246                 u32 rates = 0, basic_rates = 0;
4247                 bool have_higher_than_11mbit;
4248                 int min_rate = INT_MAX, min_rate_index = -1;
4249                 struct ieee80211_chanctx_conf *chanctx_conf;
4250                 const struct cfg80211_bss_ies *ies;
4251                 int shift = ieee80211_vif_get_shift(&sdata->vif);
4252                 u32 rate_flags;
4253
4254                 rcu_read_lock();
4255                 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4256                 if (WARN_ON(!chanctx_conf)) {
4257                         rcu_read_unlock();
4258                         sta_info_free(local, new_sta);
4259                         return -EINVAL;
4260                 }
4261                 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
4262                 rcu_read_unlock();
4263
4264                 ieee80211_get_rates(sband, bss->supp_rates,
4265                                     bss->supp_rates_len,
4266                                     &rates, &basic_rates,
4267                                     &have_higher_than_11mbit,
4268                                     &min_rate, &min_rate_index,
4269                                     shift, rate_flags);
4270
4271                 /*
4272                  * This used to be a workaround for basic rates missing
4273                  * in the association response frame. Now that we no
4274                  * longer use the basic rates from there, it probably
4275                  * doesn't happen any more, but keep the workaround so
4276                  * in case some *other* APs are buggy in different ways
4277                  * we can connect -- with a warning.
4278                  */
4279                 if (!basic_rates && min_rate_index >= 0) {
4280                         sdata_info(sdata,
4281                                    "No basic rates, using min rate instead\n");
4282                         basic_rates = BIT(min_rate_index);
4283                 }
4284
4285                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
4286                 sdata->vif.bss_conf.basic_rates = basic_rates;
4287
4288                 /* cf. IEEE 802.11 9.2.12 */
4289                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
4290                     have_higher_than_11mbit)
4291                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
4292                 else
4293                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
4294
4295                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
4296
4297                 /* set timing information */
4298                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
4299                 rcu_read_lock();
4300                 ies = rcu_dereference(cbss->beacon_ies);
4301                 if (ies) {
4302                         const u8 *tim_ie;
4303
4304                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4305                         sdata->vif.bss_conf.sync_device_ts =
4306                                 bss->device_ts_beacon;
4307                         tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4308                                                   ies->data, ies->len);
4309                         if (tim_ie && tim_ie[1] >= 2)
4310                                 sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
4311                         else
4312                                 sdata->vif.bss_conf.sync_dtim_count = 0;
4313                 } else if (!(local->hw.flags &
4314                                         IEEE80211_HW_TIMING_BEACON_ONLY)) {
4315                         ies = rcu_dereference(cbss->proberesp_ies);
4316                         /* must be non-NULL since beacon IEs were NULL */
4317                         sdata->vif.bss_conf.sync_tsf = ies->tsf;
4318                         sdata->vif.bss_conf.sync_device_ts =
4319                                 bss->device_ts_presp;
4320                         sdata->vif.bss_conf.sync_dtim_count = 0;
4321                 } else {
4322                         sdata->vif.bss_conf.sync_tsf = 0;
4323                         sdata->vif.bss_conf.sync_device_ts = 0;
4324                         sdata->vif.bss_conf.sync_dtim_count = 0;
4325                 }
4326                 rcu_read_unlock();
4327
4328                 /* tell driver about BSSID, basic rates and timing */
4329                 ieee80211_bss_info_change_notify(sdata,
4330                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
4331                         BSS_CHANGED_BEACON_INT);
4332
4333                 if (assoc)
4334                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4335
4336                 err = sta_info_insert(new_sta);
4337                 new_sta = NULL;
4338                 if (err) {
4339                         sdata_info(sdata,
4340                                    "failed to insert STA entry for the AP (error %d)\n",
4341                                    err);
4342                         return err;
4343                 }
4344         } else
4345                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4346
4347         return 0;
4348 }
4349
4350 /* config hooks */
4351 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
4352                        struct cfg80211_auth_request *req)
4353 {
4354         struct ieee80211_local *local = sdata->local;
4355         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4356         struct ieee80211_mgd_auth_data *auth_data;
4357         u16 auth_alg;
4358         int err;
4359
4360         /* prepare auth data structure */
4361
4362         switch (req->auth_type) {
4363         case NL80211_AUTHTYPE_OPEN_SYSTEM:
4364                 auth_alg = WLAN_AUTH_OPEN;
4365                 break;
4366         case NL80211_AUTHTYPE_SHARED_KEY:
4367                 if (IS_ERR(local->wep_tx_tfm))
4368                         return -EOPNOTSUPP;
4369                 auth_alg = WLAN_AUTH_SHARED_KEY;
4370                 break;
4371         case NL80211_AUTHTYPE_FT:
4372                 auth_alg = WLAN_AUTH_FT;
4373                 break;
4374         case NL80211_AUTHTYPE_NETWORK_EAP:
4375                 auth_alg = WLAN_AUTH_LEAP;
4376                 break;
4377         case NL80211_AUTHTYPE_SAE:
4378                 auth_alg = WLAN_AUTH_SAE;
4379                 break;
4380         default:
4381                 return -EOPNOTSUPP;
4382         }
4383
4384         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
4385                             req->ie_len, GFP_KERNEL);
4386         if (!auth_data)
4387                 return -ENOMEM;
4388
4389         auth_data->bss = req->bss;
4390
4391         if (req->sae_data_len >= 4) {
4392                 __le16 *pos = (__le16 *) req->sae_data;
4393                 auth_data->sae_trans = le16_to_cpu(pos[0]);
4394                 auth_data->sae_status = le16_to_cpu(pos[1]);
4395                 memcpy(auth_data->data, req->sae_data + 4,
4396                        req->sae_data_len - 4);
4397                 auth_data->data_len += req->sae_data_len - 4;
4398         }
4399
4400         if (req->ie && req->ie_len) {
4401                 memcpy(&auth_data->data[auth_data->data_len],
4402                        req->ie, req->ie_len);
4403                 auth_data->data_len += req->ie_len;
4404         }
4405
4406         if (req->key && req->key_len) {
4407                 auth_data->key_len = req->key_len;
4408                 auth_data->key_idx = req->key_idx;
4409                 memcpy(auth_data->key, req->key, req->key_len);
4410         }
4411
4412         auth_data->algorithm = auth_alg;
4413
4414         /* try to authenticate/probe */
4415
4416         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
4417             ifmgd->assoc_data) {
4418                 err = -EBUSY;
4419                 goto err_free;
4420         }
4421
4422         if (ifmgd->auth_data)
4423                 ieee80211_destroy_auth_data(sdata, false);
4424
4425         /* prep auth_data so we don't go into idle on disassoc */
4426         ifmgd->auth_data = auth_data;
4427
4428         if (ifmgd->associated) {
4429                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4430
4431                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4432                                        WLAN_REASON_UNSPECIFIED,
4433                                        false, frame_buf);
4434
4435                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4436                                       sizeof(frame_buf));
4437         }
4438
4439         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4440
4441         err = ieee80211_prep_connection(sdata, req->bss, false);
4442         if (err)
4443                 goto err_clear;
4444
4445         err = ieee80211_probe_auth(sdata);
4446         if (err) {
4447                 sta_info_destroy_addr(sdata, req->bss->bssid);
4448                 goto err_clear;
4449         }
4450
4451         /* hold our own reference */
4452         cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4453         return 0;
4454
4455  err_clear:
4456         memset(ifmgd->bssid, 0, ETH_ALEN);
4457         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4458         ifmgd->auth_data = NULL;
4459  err_free:
4460         kfree(auth_data);
4461         return err;
4462 }
4463
4464 static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
4465                                         const u8 *wmm_param, int len)
4466 {
4467         const u8 *pos;
4468         size_t left;
4469
4470         if (len < 8)
4471                 return false;
4472
4473         if (wmm_param[5] != 1 /* version */)
4474                 return false;
4475
4476         pos = wmm_param + 8;
4477         left = len - 8;
4478
4479         for (; left >= 4; left -= 4, pos += 4) {
4480                 u8 aifsn = pos[0] & 0x0f;
4481                 u8 ecwmin = pos[1] & 0x0f;
4482                 u8 ecwmax = (pos[1] & 0xf0) >> 4;
4483                 int aci = (pos[0] >> 5) & 0x03;
4484
4485                 if (aifsn < 2) {
4486                         sdata_info(sdata,
4487                                    "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
4488                                    aifsn, aci);
4489                         return false;
4490                 }
4491                 if (ecwmin > ecwmax) {
4492                         sdata_info(sdata,
4493                                    "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
4494                                    ecwmin, ecwmax, aci);
4495                         return false;
4496                 }
4497         }
4498
4499         return true;
4500 }
4501
4502 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
4503                         struct cfg80211_assoc_request *req)
4504 {
4505         struct ieee80211_local *local = sdata->local;
4506         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4507         struct ieee80211_bss *bss = (void *)req->bss->priv;
4508         struct ieee80211_mgd_assoc_data *assoc_data;
4509         const struct cfg80211_bss_ies *beacon_ies;
4510         struct ieee80211_supported_band *sband;
4511         const u8 *ssidie, *ht_ie, *vht_ie;
4512         int i, err;
4513
4514         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
4515         if (!assoc_data)
4516                 return -ENOMEM;
4517
4518         rcu_read_lock();
4519         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
4520         if (!ssidie) {
4521                 rcu_read_unlock();
4522                 kfree(assoc_data);
4523                 return -EINVAL;
4524         }
4525         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
4526         assoc_data->ssid_len = ssidie[1];
4527         rcu_read_unlock();
4528
4529         if (ifmgd->associated) {
4530                 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4531
4532                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4533                                        WLAN_REASON_UNSPECIFIED,
4534                                        false, frame_buf);
4535
4536                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4537                                       sizeof(frame_buf));
4538         }
4539
4540         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
4541                 err = -EBUSY;
4542                 goto err_free;
4543         }
4544
4545         if (ifmgd->assoc_data) {
4546                 err = -EBUSY;
4547                 goto err_free;
4548         }
4549
4550         if (ifmgd->auth_data) {
4551                 bool match;
4552
4553                 /* keep sta info, bssid if matching */
4554                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
4555                 ieee80211_destroy_auth_data(sdata, match);
4556         }
4557
4558         /* prepare assoc data */
4559
4560         ifmgd->beacon_crc_valid = false;
4561
4562         assoc_data->wmm = bss->wmm_used &&
4563                           (local->hw.queues >= IEEE80211_NUM_ACS);
4564         if (assoc_data->wmm) {
4565                 /* try to check validity of WMM params IE */
4566                 const struct cfg80211_bss_ies *ies;
4567                 const u8 *wp, *start, *end;
4568
4569                 rcu_read_lock();
4570                 ies = rcu_dereference(req->bss->ies);
4571                 start = ies->data;
4572                 end = start + ies->len;
4573
4574                 while (true) {
4575                         wp = cfg80211_find_vendor_ie(
4576                                 WLAN_OUI_MICROSOFT,
4577                                 WLAN_OUI_TYPE_MICROSOFT_WMM,
4578                                 start, end - start);
4579                         if (!wp)
4580                                 break;
4581                         start = wp + wp[1] + 2;
4582                         /* if this IE is too short, try the next */
4583                         if (wp[1] <= 4)
4584                                 continue;
4585                         /* if this IE is WMM params, we found what we wanted */
4586                         if (wp[6] == 1)
4587                                 break;
4588                 }
4589
4590                 if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
4591                                                         wp[1] - 2)) {
4592                         assoc_data->wmm = false;
4593                         ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
4594                 }
4595                 rcu_read_unlock();
4596         }
4597
4598         /*
4599          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
4600          * We still associate in non-HT mode (11a/b/g) if any one of these
4601          * ciphers is configured as pairwise.
4602          * We can set this to true for non-11n hardware, that'll be checked
4603          * separately along with the peer capabilities.
4604          */
4605         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4606                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
4607                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4608                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4609                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4610                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4611                         netdev_info(sdata->dev,
4612                                     "disabling HT/VHT due to WEP/TKIP use\n");
4613                 }
4614         }
4615
4616         if (req->flags & ASSOC_REQ_DISABLE_HT) {
4617                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4618                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4619         }
4620
4621         if (req->flags & ASSOC_REQ_DISABLE_VHT)
4622                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4623
4624         /* Also disable HT if we don't support it or the AP doesn't use WMM */
4625         sband = local->hw.wiphy->bands[req->bss->channel->band];
4626         if (!sband->ht_cap.ht_supported ||
4627             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4628             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4629                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4630                 if (!bss->wmm_used &&
4631                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4632                         netdev_info(sdata->dev,
4633                                     "disabling HT as WMM/QoS is not supported by the AP\n");
4634         }
4635
4636         /* disable VHT if we don't support it or the AP doesn't use WMM */
4637         if (!sband->vht_cap.vht_supported ||
4638             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
4639             ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4640                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4641                 if (!bss->wmm_used &&
4642                     !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4643                         netdev_info(sdata->dev,
4644                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
4645         }
4646
4647         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
4648         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
4649                sizeof(ifmgd->ht_capa_mask));
4650
4651         memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
4652         memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
4653                sizeof(ifmgd->vht_capa_mask));
4654
4655         if (req->ie && req->ie_len) {
4656                 memcpy(assoc_data->ie, req->ie, req->ie_len);
4657                 assoc_data->ie_len = req->ie_len;
4658         }
4659
4660         assoc_data->bss = req->bss;
4661
4662         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
4663                 if (ifmgd->powersave)
4664                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
4665                 else
4666                         sdata->smps_mode = IEEE80211_SMPS_OFF;
4667         } else
4668                 sdata->smps_mode = ifmgd->req_smps;
4669
4670         assoc_data->capability = req->bss->capability;
4671         assoc_data->supp_rates = bss->supp_rates;
4672         assoc_data->supp_rates_len = bss->supp_rates_len;
4673
4674         rcu_read_lock();
4675         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
4676         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
4677                 assoc_data->ap_ht_param =
4678                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
4679         else
4680                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4681         vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
4682         if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
4683                 memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
4684                        sizeof(struct ieee80211_vht_cap));
4685         else
4686                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4687         rcu_read_unlock();
4688
4689         if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4690                  (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
4691              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
4692                 sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
4693
4694         if (bss->wmm_used && bss->uapsd_supported &&
4695             (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4696                 assoc_data->uapsd = true;
4697                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
4698         } else {
4699                 assoc_data->uapsd = false;
4700                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
4701         }
4702
4703         if (req->prev_bssid)
4704                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4705
4706         if (req->use_mfp) {
4707                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
4708                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
4709         } else {
4710                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
4711                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
4712         }
4713
4714         if (req->flags & ASSOC_REQ_USE_RRM)
4715                 ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
4716         else
4717                 ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;
4718
4719         if (req->crypto.control_port)
4720                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
4721         else
4722                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
4723
4724         sdata->control_port_protocol = req->crypto.control_port_ethertype;
4725         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4726         sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
4727                                                         sdata->vif.type);
4728
4729         /* kick off associate process */
4730
4731         ifmgd->assoc_data = assoc_data;
4732         ifmgd->dtim_period = 0;
4733         ifmgd->have_beacon = false;
4734
4735         err = ieee80211_prep_connection(sdata, req->bss, true);
4736         if (err)
4737                 goto err_clear;
4738
4739         rcu_read_lock();
4740         beacon_ies = rcu_dereference(req->bss->beacon_ies);
4741
4742         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
4743             !beacon_ies) {
4744                 /*
4745                  * Wait up to one beacon interval ...
4746                  * should this be more if we miss one?
4747                  */
4748                 sdata_info(sdata, "waiting for beacon from %pM\n",
4749                            ifmgd->bssid);
4750                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4751                 assoc_data->timeout_started = true;
4752                 assoc_data->need_beacon = true;
4753         } else if (beacon_ies) {
4754                 const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
4755                                                     beacon_ies->data,
4756                                                     beacon_ies->len);
4757                 u8 dtim_count = 0;
4758
4759                 if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
4760                         const struct ieee80211_tim_ie *tim;
4761                         tim = (void *)(tim_ie + 2);
4762                         ifmgd->dtim_period = tim->dtim_period;
4763                         dtim_count = tim->dtim_count;
4764                 }
4765                 ifmgd->have_beacon = true;
4766                 assoc_data->timeout = jiffies;
4767                 assoc_data->timeout_started = true;
4768
4769                 if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
4770                         sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
4771                         sdata->vif.bss_conf.sync_device_ts =
4772                                 bss->device_ts_beacon;
4773                         sdata->vif.bss_conf.sync_dtim_count = dtim_count;
4774                 }
4775         } else {
4776                 assoc_data->timeout = jiffies;
4777                 assoc_data->timeout_started = true;
4778         }
4779         rcu_read_unlock();
4780
4781         run_again(sdata, assoc_data->timeout);
4782
4783         if (bss->corrupt_data) {
4784                 char *corrupt_type = "data";
4785                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
4786                         if (bss->corrupt_data &
4787                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
4788                                 corrupt_type = "beacon and probe response";
4789                         else
4790                                 corrupt_type = "beacon";
4791                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
4792                         corrupt_type = "probe response";
4793                 sdata_info(sdata, "associating with AP with corrupt %s\n",
4794                            corrupt_type);
4795         }
4796
4797         return 0;
4798  err_clear:
4799         memset(ifmgd->bssid, 0, ETH_ALEN);
4800         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
4801         ifmgd->assoc_data = NULL;
4802  err_free:
4803         kfree(assoc_data);
4804         return err;
4805 }
4806
4807 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4808                          struct cfg80211_deauth_request *req)
4809 {
4810         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4811         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4812         bool tx = !req->local_state_change;
4813
4814         if (ifmgd->auth_data &&
4815             ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
4816                 sdata_info(sdata,
4817                            "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
4818                            req->bssid, req->reason_code,
4819                            ieee80211_get_reason_code_string(req->reason_code));
4820
4821                 drv_mgd_prepare_tx(sdata->local, sdata);
4822                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
4823                                                IEEE80211_STYPE_DEAUTH,
4824                                                req->reason_code, tx,
4825                                                frame_buf);
4826                 ieee80211_destroy_auth_data(sdata, false);
4827                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4828                                       IEEE80211_DEAUTH_FRAME_LEN);
4829
4830                 return 0;
4831         }
4832
4833         if (ifmgd->associated &&
4834             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4835                 sdata_info(sdata,
4836                            "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
4837                            req->bssid, req->reason_code,
4838                            ieee80211_get_reason_code_string(req->reason_code));
4839
4840                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4841                                        req->reason_code, tx, frame_buf);
4842                 cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4843                                       IEEE80211_DEAUTH_FRAME_LEN);
4844                 return 0;
4845         }
4846
4847         return -ENOTCONN;
4848 }
4849
4850 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4851                            struct cfg80211_disassoc_request *req)
4852 {
4853         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4854         u8 bssid[ETH_ALEN];
4855         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4856
4857         /*
4858          * cfg80211 should catch this ... but it's racy since
4859          * we can receive a disassoc frame, process it, hand it
4860          * to cfg80211 while that's in a locked section already
4861          * trying to tell us that the user wants to disconnect.
4862          */
4863         if (ifmgd->associated != req->bss)
4864                 return -ENOLINK;
4865
4866         sdata_info(sdata,
4867                    "disassociating from %pM by local choice (Reason: %u=%s)\n",
4868                    req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
4869
4870         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4871         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4872                                req->reason_code, !req->local_state_change,
4873                                frame_buf);
4874
4875         cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
4876                               IEEE80211_DEAUTH_FRAME_LEN);
4877
4878         return 0;
4879 }
4880
4881 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4882 {
4883         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4884
4885         /*
4886          * Make sure some work items will not run after this,
4887          * they will not do anything but might not have been
4888          * cancelled when disconnecting.
4889          */
4890         cancel_work_sync(&ifmgd->monitor_work);
4891         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
4892         cancel_work_sync(&ifmgd->request_smps_work);
4893         cancel_work_sync(&ifmgd->csa_connection_drop_work);
4894         cancel_work_sync(&ifmgd->chswitch_work);
4895         cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
4896
4897         sdata_lock(sdata);
4898         if (ifmgd->assoc_data) {
4899                 struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4900                 ieee80211_destroy_assoc_data(sdata, false);
4901                 cfg80211_assoc_timeout(sdata->dev, bss);
4902         }
4903         if (ifmgd->auth_data)
4904                 ieee80211_destroy_auth_data(sdata, false);
4905         spin_lock_bh(&ifmgd->teardown_lock);
4906         if (ifmgd->teardown_skb) {
4907                 kfree_skb(ifmgd->teardown_skb);
4908                 ifmgd->teardown_skb = NULL;
4909                 ifmgd->orig_teardown_skb = NULL;
4910         }
4911         spin_unlock_bh(&ifmgd->teardown_lock);
4912         del_timer_sync(&ifmgd->timer);
4913         sdata_unlock(sdata);
4914 }
4915
4916 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4917                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4918                                gfp_t gfp)
4919 {
4920         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4921
4922         trace_api_cqm_rssi_notify(sdata, rssi_event);
4923
4924         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4925 }
4926 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
4927
4928 void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
4929 {
4930         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4931
4932         trace_api_cqm_beacon_loss_notify(sdata->local, sdata);
4933
4934         cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
4935 }
4936 EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);