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  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  34 #define IEEE80211_AUTH_MAX_TRIES 3
  35 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
  36 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  37 #define IEEE80211_ASSOC_MAX_TRIES 3
  38
  39 static int max_nullfunc_tries = 2;
  40 module_param(max_nullfunc_tries, int, 0644);
  41 MODULE_PARM_DESC(max_nullfunc_tries,
  42                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  43
  44 static int max_probe_tries = 5;
  45 module_param(max_probe_tries, int, 0644);
  46 MODULE_PARM_DESC(max_probe_tries,
  47                  "Maximum probe tries before disconnecting (reason 4).");
  48
  49 /*
  50  * Beacon loss timeout is calculated as N frames times the
  51  * advertised beacon interval.  This may need to be somewhat
  52  * higher than what hardware might detect to account for
  53  * delays in the host processing frames. But since we also
  54  * probe on beacon miss before declaring the connection lost
  55  * default to what we want.
  56  */
  57 #define IEEE80211_BEACON_LOSS_COUNT     7
  58
  59 /*
  60  * Time the connection can be idle before we probe
  61  * it to see if we can still talk to the AP.
  62  */
  63 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  64 /*
  65  * Time we wait for a probe response after sending
  66  * a probe request because of beacon loss or for
  67  * checking the connection still works.
  68  */
  69 static int probe_wait_ms = 500;
  70 module_param(probe_wait_ms, int, 0644);
  71 MODULE_PARM_DESC(probe_wait_ms,
  72                  "Maximum time(ms) to wait for probe response"
  73                  " before disconnecting (reason 4).");
  74
  75 /*
  76  * Weight given to the latest Beacon frame when calculating average signal
  77  * strength for Beacon frames received in the current BSS. This must be
  78  * between 1 and 15.
  79  */
  80 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  81
  82 /*
  83  * How many Beacon frames need to have been used in average signal strength
  84  * before starting to indicate signal change events.
  85  */
  86 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  87
  88 #define TMR_RUNNING_TIMER       0
  89 #define TMR_RUNNING_CHANSW      1
  90
  91 /*
  92  * All cfg80211 functions have to be called outside a locked
  93  * section so that they can acquire a lock themselves... This
  94  * is much simpler than queuing up things in cfg80211, but we
  95  * do need some indirection for that here.
  96  */
  97 enum rx_mgmt_action {
  98         /* no action required */
  99         RX_MGMT_NONE,
 100
 101         /* caller must call cfg80211_send_deauth() */
 102         RX_MGMT_CFG80211_DEAUTH,
 103
 104         /* caller must call cfg80211_send_disassoc() */
 105         RX_MGMT_CFG80211_DISASSOC,
 106
 107         /* caller must call cfg80211_send_rx_auth() */
 108         RX_MGMT_CFG80211_RX_AUTH,
 109
 110         /* caller must call cfg80211_send_rx_assoc() */
 111         RX_MGMT_CFG80211_RX_ASSOC,
 112
 113         /* caller must call cfg80211_send_assoc_timeout() */
 114         RX_MGMT_CFG80211_ASSOC_TIMEOUT,
 115 };
 116
 117 /* utils */
 118 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 119 {
 120         lockdep_assert_held(&ifmgd->mtx);
 121 }
 122
 123 /*
 124  * We can have multiple work items (and connection probing)
 125  * scheduling this timer, but we need to take care to only
 126  * reschedule it when it should fire _earlier_ than it was
 127  * asked for before, or if it's not pending right now. This
 128  * function ensures that. Note that it then is required to
 129  * run this function for all timeouts after the first one
 130  * has happened -- the work that runs from this timer will
 131  * do that.
 132  */
 133 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
 134 {
 135         ASSERT_MGD_MTX(ifmgd);
 136
 137         if (!timer_pending(&ifmgd->timer) ||
 138             time_before(timeout, ifmgd->timer.expires))
 139                 mod_timer(&ifmgd->timer, timeout);
 140 }
 141
 142 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 143 {
 144         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 145                 return;
 146
 147         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 148                 return;
 149
 150         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 151                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 152 }
 153
 154 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 155 {
 156         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 157
 158         if (unlikely(!sdata->u.mgd.associated))
 159                 return;
 160
 161         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 162                 return;
 163
 164         mod_timer(&sdata->u.mgd.conn_mon_timer,
 165                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 166
 167         ifmgd->probe_send_count = 0;
 168 }
 169
 170 static int ecw2cw(int ecw)
 171 {
 172         return (1 << ecw) - 1;
 173 }
 174
 175 static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
 176                                   struct ieee80211_ht_operation *ht_oper,
 177                                   const u8 *bssid, bool reconfig)
 178 {
 179         struct ieee80211_local *local = sdata->local;
 180         struct ieee80211_supported_band *sband;
 181         struct ieee80211_chanctx_conf *chanctx_conf;
 182         struct ieee80211_channel *chan;
 183         struct sta_info *sta;
 184         u32 changed = 0;
 185         u16 ht_opmode;
 186         bool disable_40 = false;
 187
 188         rcu_read_lock();
 189         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 190         if (WARN_ON(!chanctx_conf)) {
 191                 rcu_read_unlock();
 192                 return 0;
 193         }
 194         chan = chanctx_conf->def.chan;
 195         rcu_read_unlock();
 196         sband = local->hw.wiphy->bands[chan->band];
 197
 198         switch (sdata->vif.bss_conf.chandef.width) {
 199         case NL80211_CHAN_WIDTH_40:
 200                 if (sdata->vif.bss_conf.chandef.chan->center_freq >
 201                                 sdata->vif.bss_conf.chandef.center_freq1 &&
 202                     chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
 203                         disable_40 = true;
 204                 if (sdata->vif.bss_conf.chandef.chan->center_freq <
 205                                 sdata->vif.bss_conf.chandef.center_freq1 &&
 206                     chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
 207                         disable_40 = true;
 208                 break;
 209         default:
 210                 break;
 211         }
 212
 213         /* This can change during the lifetime of the BSS */
 214         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 215                 disable_40 = true;
 216
 217         mutex_lock(&local->sta_mtx);
 218         sta = sta_info_get(sdata, bssid);
 219
 220         WARN_ON_ONCE(!sta);
 221
 222         if (sta && !sta->supports_40mhz)
 223                 disable_40 = true;
 224
 225         if (sta && (!reconfig ||
 226                     (disable_40 != !(sta->sta.ht_cap.cap &
 227                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 228
 229                 if (disable_40)
 230                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 231                 else
 232                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 233
 234                 rate_control_rate_update(local, sband, sta,
 235                                          IEEE80211_RC_BW_CHANGED);
 236         }
 237         mutex_unlock(&local->sta_mtx);
 238
 239         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 240
 241         /* if bss configuration changed store the new one */
 242         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 243                 changed |= BSS_CHANGED_HT;
 244                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 245         }
 246
 247         return changed;
 248 }
 249
 250 /* frame sending functions */
 251
 252 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 253                                       struct ieee80211_supported_band *sband,
 254                                       u32 *rates)
 255 {
 256         int i, j, count;
 257         *rates = 0;
 258         count = 0;
 259         for (i = 0; i < supp_rates_len; i++) {
 260                 int rate = (supp_rates[i] & 0x7F) * 5;
 261
 262                 for (j = 0; j < sband->n_bitrates; j++)
 263                         if (sband->bitrates[j].bitrate == rate) {
 264                                 *rates |= BIT(j);
 265                                 count++;
 266                                 break;
 267                         }
 268         }
 269
 270         return count;
 271 }
 272
 273 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 274                                 struct sk_buff *skb, u8 ap_ht_param,
 275                                 struct ieee80211_supported_band *sband,
 276                                 struct ieee80211_channel *channel,
 277                                 enum ieee80211_smps_mode smps)
 278 {
 279         u8 *pos;
 280         u32 flags = channel->flags;
 281         u16 cap;
 282         struct ieee80211_sta_ht_cap ht_cap;
 283
 284         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 285
 286         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 287         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 288
 289         /* determine capability flags */
 290         cap = ht_cap.cap;
 291
 292         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 293         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 294                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 295                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 296                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 297                 }
 298                 break;
 299         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 300                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 301                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 302                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 303                 }
 304                 break;
 305         }
 306
 307         /*
 308          * If 40 MHz was disabled associate as though we weren't
 309          * capable of 40 MHz -- some broken APs will never fall
 310          * back to trying to transmit in 20 MHz.
 311          */
 312         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 313                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 314                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 315         }
 316
 317         /* set SM PS mode properly */
 318         cap &= ~IEEE80211_HT_CAP_SM_PS;
 319         switch (smps) {
 320         case IEEE80211_SMPS_AUTOMATIC:
 321         case IEEE80211_SMPS_NUM_MODES:
 322                 WARN_ON(1);
 323         case IEEE80211_SMPS_OFF:
 324                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 325                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 326                 break;
 327         case IEEE80211_SMPS_STATIC:
 328                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 329                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 330                 break;
 331         case IEEE80211_SMPS_DYNAMIC:
 332                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 333                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 334                 break;
 335         }
 336
 337         /* reserve and fill IE */
 338         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 339         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 340 }
 341
 342 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 343                                  struct sk_buff *skb,
 344                                  struct ieee80211_supported_band *sband)
 345 {
 346         u8 *pos;
 347         u32 cap;
 348         struct ieee80211_sta_vht_cap vht_cap;
 349
 350         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 351
 352         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 353
 354         /* determine capability flags */
 355         cap = vht_cap.cap;
 356
 357         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
 358                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
 359                 cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 360         }
 361
 362         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
 363                 cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
 364                 cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 365         }
 366
 367         /* reserve and fill IE */
 368         pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
 369         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 370 }
 371
 372 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 373 {
 374         struct ieee80211_local *local = sdata->local;
 375         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 376         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 377         struct sk_buff *skb;
 378         struct ieee80211_mgmt *mgmt;
 379         u8 *pos, qos_info;
 380         size_t offset = 0, noffset;
 381         int i, count, rates_len, supp_rates_len;
 382         u16 capab;
 383         struct ieee80211_supported_band *sband;
 384         struct ieee80211_chanctx_conf *chanctx_conf;
 385         struct ieee80211_channel *chan;
 386         u32 rates = 0;
 387
 388         lockdep_assert_held(&ifmgd->mtx);
 389
 390         rcu_read_lock();
 391         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 392         if (WARN_ON(!chanctx_conf)) {
 393                 rcu_read_unlock();
 394                 return;
 395         }
 396         chan = chanctx_conf->def.chan;
 397         rcu_read_unlock();
 398         sband = local->hw.wiphy->bands[chan->band];
 399
 400         if (assoc_data->supp_rates_len) {
 401                 /*
 402                  * Get all rates supported by the device and the AP as
 403                  * some APs don't like getting a superset of their rates
 404                  * in the association request (e.g. D-Link DAP 1353 in
 405                  * b-only mode)...
 406                  */
 407                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 408                                                        assoc_data->supp_rates_len,
 409                                                        sband, &rates);
 410         } else {
 411                 /*
 412                  * In case AP not provide any supported rates information
 413                  * before association, we send information element(s) with
 414                  * all rates that we support.
 415                  */
 416                 rates = ~0;
 417                 rates_len = sband->n_bitrates;
 418         }
 419
 420         skb = alloc_skb(local->hw.extra_tx_headroom +
 421                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 422                         2 + assoc_data->ssid_len + /* SSID */
 423                         4 + rates_len + /* (extended) rates */
 424                         4 + /* power capability */
 425                         2 + 2 * sband->n_channels + /* supported channels */
 426                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 427                         2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
 428                         assoc_data->ie_len + /* extra IEs */
 429                         9, /* WMM */
 430                         GFP_KERNEL);
 431         if (!skb)
 432                 return;
 433
 434         skb_reserve(skb, local->hw.extra_tx_headroom);
 435
 436         capab = WLAN_CAPABILITY_ESS;
 437
 438         if (sband->band == IEEE80211_BAND_2GHZ) {
 439                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 440                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 441                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 442                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 443         }
 444
 445         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 446                 capab |= WLAN_CAPABILITY_PRIVACY;
 447
 448         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 449             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 450                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 451
 452         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 453         memset(mgmt, 0, 24);
 454         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 455         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 456         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 457
 458         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 459                 skb_put(skb, 10);
 460                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 461                                                   IEEE80211_STYPE_REASSOC_REQ);
 462                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 463                 mgmt->u.reassoc_req.listen_interval =
 464                                 cpu_to_le16(local->hw.conf.listen_interval);
 465                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 466                        ETH_ALEN);
 467         } else {
 468                 skb_put(skb, 4);
 469                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 470                                                   IEEE80211_STYPE_ASSOC_REQ);
 471                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 472                 mgmt->u.assoc_req.listen_interval =
 473                                 cpu_to_le16(local->hw.conf.listen_interval);
 474         }
 475
 476         /* SSID */
 477         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 478         *pos++ = WLAN_EID_SSID;
 479         *pos++ = assoc_data->ssid_len;
 480         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 481
 482         /* add all rates which were marked to be used above */
 483         supp_rates_len = rates_len;
 484         if (supp_rates_len > 8)
 485                 supp_rates_len = 8;
 486
 487         pos = skb_put(skb, supp_rates_len + 2);
 488         *pos++ = WLAN_EID_SUPP_RATES;
 489         *pos++ = supp_rates_len;
 490
 491         count = 0;
 492         for (i = 0; i < sband->n_bitrates; i++) {
 493                 if (BIT(i) & rates) {
 494                         int rate = sband->bitrates[i].bitrate;
 495                         *pos++ = (u8) (rate / 5);
 496                         if (++count == 8)
 497                                 break;
 498                 }
 499         }
 500
 501         if (rates_len > count) {
 502                 pos = skb_put(skb, rates_len - count + 2);
 503                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 504                 *pos++ = rates_len - count;
 505
 506                 for (i++; i < sband->n_bitrates; i++) {
 507                         if (BIT(i) & rates) {
 508                                 int rate = sband->bitrates[i].bitrate;
 509                                 *pos++ = (u8) (rate / 5);
 510                         }
 511                 }
 512         }
 513
 514         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 515                 /* 1. power capabilities */
 516                 pos = skb_put(skb, 4);
 517                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 518                 *pos++ = 2;
 519                 *pos++ = 0; /* min tx power */
 520                 *pos++ = chan->max_power; /* max tx power */
 521
 522                 /* 2. supported channels */
 523                 /* TODO: get this in reg domain format */
 524                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 525                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 526                 *pos++ = 2 * sband->n_channels;
 527                 for (i = 0; i < sband->n_channels; i++) {
 528                         *pos++ = ieee80211_frequency_to_channel(
 529                                         sband->channels[i].center_freq);
 530                         *pos++ = 1; /* one channel in the subband*/
 531                 }
 532         }
 533
 534         /* if present, add any custom IEs that go before HT */
 535         if (assoc_data->ie_len && assoc_data->ie) {
 536                 static const u8 before_ht[] = {
 537                         WLAN_EID_SSID,
 538                         WLAN_EID_SUPP_RATES,
 539                         WLAN_EID_EXT_SUPP_RATES,
 540                         WLAN_EID_PWR_CAPABILITY,
 541                         WLAN_EID_SUPPORTED_CHANNELS,
 542                         WLAN_EID_RSN,
 543                         WLAN_EID_QOS_CAPA,
 544                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 545                         WLAN_EID_MOBILITY_DOMAIN,
 546                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 547                 };
 548                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 549                                              before_ht, ARRAY_SIZE(before_ht),
 550                                              offset);
 551                 pos = skb_put(skb, noffset - offset);
 552                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 553                 offset = noffset;
 554         }
 555
 556         if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
 557                          !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
 558                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
 559
 560         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
 561                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 562                                     sband, chan, sdata->smps_mode);
 563
 564         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 565                 ieee80211_add_vht_ie(sdata, skb, sband);
 566
 567         /* if present, add any custom non-vendor IEs that go after HT */
 568         if (assoc_data->ie_len && assoc_data->ie) {
 569                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 570                                                     assoc_data->ie_len,
 571                                                     offset);
 572                 pos = skb_put(skb, noffset - offset);
 573                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 574                 offset = noffset;
 575         }
 576
 577         if (assoc_data->wmm) {
 578                 if (assoc_data->uapsd) {
 579                         qos_info = ifmgd->uapsd_queues;
 580                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 581                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 582                 } else {
 583                         qos_info = 0;
 584                 }
 585
 586                 pos = skb_put(skb, 9);
 587                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 588                 *pos++ = 7; /* len */
 589                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 590                 *pos++ = 0x50;
 591                 *pos++ = 0xf2;
 592                 *pos++ = 2; /* WME */
 593                 *pos++ = 0; /* WME info */
 594                 *pos++ = 1; /* WME ver */
 595                 *pos++ = qos_info;
 596         }
 597
 598         /* add any remaining custom (i.e. vendor specific here) IEs */
 599         if (assoc_data->ie_len && assoc_data->ie) {
 600                 noffset = assoc_data->ie_len;
 601                 pos = skb_put(skb, noffset - offset);
 602                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 603         }
 604
 605         drv_mgd_prepare_tx(local, sdata);
 606
 607         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 608         ieee80211_tx_skb(sdata, skb);
 609 }
 610
 611 void ieee80211_send_pspoll(struct ieee80211_local *local,
 612                            struct ieee80211_sub_if_data *sdata)
 613 {
 614         struct ieee80211_pspoll *pspoll;
 615         struct sk_buff *skb;
 616
 617         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 618         if (!skb)
 619                 return;
 620
 621         pspoll = (struct ieee80211_pspoll *) skb->data;
 622         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 623
 624         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 625         ieee80211_tx_skb(sdata, skb);
 626 }
 627
 628 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 629                              struct ieee80211_sub_if_data *sdata,
 630                              int powersave)
 631 {
 632         struct sk_buff *skb;
 633         struct ieee80211_hdr_3addr *nullfunc;
 634         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 635
 636         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 637         if (!skb)
 638                 return;
 639
 640         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 641         if (powersave)
 642                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 643
 644         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 645         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 646                             IEEE80211_STA_CONNECTION_POLL))
 647                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 648
 649         ieee80211_tx_skb(sdata, skb);
 650 }
 651
 652 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 653                                           struct ieee80211_sub_if_data *sdata)
 654 {
 655         struct sk_buff *skb;
 656         struct ieee80211_hdr *nullfunc;
 657         __le16 fc;
 658
 659         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 660                 return;
 661
 662         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 663         if (!skb)
 664                 return;
 665
 666         skb_reserve(skb, local->hw.extra_tx_headroom);
 667
 668         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 669         memset(nullfunc, 0, 30);
 670         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 671                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 672         nullfunc->frame_control = fc;
 673         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 674         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 675         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 676         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 677
 678         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 679         ieee80211_tx_skb(sdata, skb);
 680 }
 681
 682 /* spectrum management related things */
 683 static void ieee80211_chswitch_work(struct work_struct *work)
 684 {
 685         struct ieee80211_sub_if_data *sdata =
 686                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 687         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 688
 689         if (!ieee80211_sdata_running(sdata))
 690                 return;
 691
 692         mutex_lock(&ifmgd->mtx);
 693         if (!ifmgd->associated)
 694                 goto out;
 695
 696         sdata->local->_oper_channel = sdata->local->csa_channel;
 697         if (!sdata->local->ops->channel_switch) {
 698                 /* call "hw_config" only if doing sw channel switch */
 699                 ieee80211_hw_config(sdata->local,
 700                         IEEE80211_CONF_CHANGE_CHANNEL);
 701         } else {
 702                 /* update the device channel directly */
 703                 sdata->local->hw.conf.channel = sdata->local->_oper_channel;
 704         }
 705
 706         /* XXX: shouldn't really modify cfg80211-owned data! */
 707         ifmgd->associated->channel = sdata->local->_oper_channel;
 708
 709         /* XXX: wait for a beacon first? */
 710         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 711                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 712  out:
 713         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 714         mutex_unlock(&ifmgd->mtx);
 715 }
 716
 717 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 718 {
 719         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 720         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 721
 722         trace_api_chswitch_done(sdata, success);
 723         if (!success) {
 724                 sdata_info(sdata,
 725                            "driver channel switch failed, disconnecting\n");
 726                 ieee80211_queue_work(&sdata->local->hw,
 727                                      &ifmgd->csa_connection_drop_work);
 728         } else {
 729                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 730         }
 731 }
 732 EXPORT_SYMBOL(ieee80211_chswitch_done);
 733
 734 static void ieee80211_chswitch_timer(unsigned long data)
 735 {
 736         struct ieee80211_sub_if_data *sdata =
 737                 (struct ieee80211_sub_if_data *) data;
 738         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 739
 740         if (sdata->local->quiescing) {
 741                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 742                 return;
 743         }
 744
 745         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 746 }
 747
 748 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 749                                       struct ieee80211_channel_sw_ie *sw_elem,
 750                                       struct ieee80211_bss *bss,
 751                                       u64 timestamp)
 752 {
 753         struct cfg80211_bss *cbss =
 754                 container_of((void *)bss, struct cfg80211_bss, priv);
 755         struct ieee80211_channel *new_ch;
 756         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 757         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 758                                                       cbss->channel->band);
 759         struct ieee80211_chanctx *chanctx;
 760
 761         ASSERT_MGD_MTX(ifmgd);
 762
 763         if (!ifmgd->associated)
 764                 return;
 765
 766         if (sdata->local->scanning)
 767                 return;
 768
 769         /* Disregard subsequent beacons if we are already running a timer
 770            processing a CSA */
 771
 772         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 773                 return;
 774
 775         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 776         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
 777                 sdata_info(sdata,
 778                            "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
 779                            ifmgd->associated->bssid, new_freq);
 780                 ieee80211_queue_work(&sdata->local->hw,
 781                                      &ifmgd->csa_connection_drop_work);
 782                 return;
 783         }
 784
 785         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 786
 787         if (sdata->local->use_chanctx) {
 788                 sdata_info(sdata,
 789                            "not handling channel switch with channel contexts\n");
 790                 ieee80211_queue_work(&sdata->local->hw,
 791                                      &ifmgd->csa_connection_drop_work);
 792                 return;
 793         }
 794
 795         mutex_lock(&sdata->local->chanctx_mtx);
 796         if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
 797                 mutex_unlock(&sdata->local->chanctx_mtx);
 798                 return;
 799         }
 800         chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
 801                                struct ieee80211_chanctx, conf);
 802         if (chanctx->refcount > 1) {
 803                 sdata_info(sdata,
 804                            "channel switch with multiple interfaces on the same channel, disconnecting\n");
 805                 ieee80211_queue_work(&sdata->local->hw,
 806                                      &ifmgd->csa_connection_drop_work);
 807                 mutex_unlock(&sdata->local->chanctx_mtx);
 808                 return;
 809         }
 810         mutex_unlock(&sdata->local->chanctx_mtx);
 811
 812         sdata->local->csa_channel = new_ch;
 813
 814         if (sw_elem->mode)
 815                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 816                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 817
 818         if (sdata->local->ops->channel_switch) {
 819                 /* use driver's channel switch callback */
 820                 struct ieee80211_channel_switch ch_switch = {
 821                         .timestamp = timestamp,
 822                         .block_tx = sw_elem->mode,
 823                         .channel = new_ch,
 824                         .count = sw_elem->count,
 825                 };
 826
 827                 drv_channel_switch(sdata->local, &ch_switch);
 828                 return;
 829         }
 830
 831         /* channel switch handled in software */
 832         if (sw_elem->count <= 1)
 833                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 834         else
 835                 mod_timer(&ifmgd->chswitch_timer,
 836                           TU_TO_EXP_TIME(sw_elem->count *
 837                                          cbss->beacon_interval));
 838 }
 839
 840 static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 841                                        struct ieee80211_channel *channel,
 842                                        const u8 *country_ie, u8 country_ie_len,
 843                                        const u8 *pwr_constr_elem)
 844 {
 845         struct ieee80211_country_ie_triplet *triplet;
 846         int chan = ieee80211_frequency_to_channel(channel->center_freq);
 847         int i, chan_pwr, chan_increment, new_ap_level;
 848         bool have_chan_pwr = false;
 849
 850         /* Invalid IE */
 851         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
 852                 return 0;
 853
 854         triplet = (void *)(country_ie + 3);
 855         country_ie_len -= 3;
 856
 857         switch (channel->band) {
 858         default:
 859                 WARN_ON_ONCE(1);
 860                 /* fall through */
 861         case IEEE80211_BAND_2GHZ:
 862         case IEEE80211_BAND_60GHZ:
 863                 chan_increment = 1;
 864                 break;
 865         case IEEE80211_BAND_5GHZ:
 866                 chan_increment = 4;
 867                 break;
 868         }
 869
 870         /* find channel */
 871         while (country_ie_len >= 3) {
 872                 u8 first_channel = triplet->chans.first_channel;
 873
 874                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
 875                         goto next;
 876
 877                 for (i = 0; i < triplet->chans.num_channels; i++) {
 878                         if (first_channel + i * chan_increment == chan) {
 879                                 have_chan_pwr = true;
 880                                 chan_pwr = triplet->chans.max_power;
 881                                 break;
 882                         }
 883                 }
 884                 if (have_chan_pwr)
 885                         break;
 886
 887  next:
 888                 triplet++;
 889                 country_ie_len -= 3;
 890         }
 891
 892         if (!have_chan_pwr)
 893                 return 0;
 894
 895         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
 896
 897         if (sdata->ap_power_level == new_ap_level)
 898                 return 0;
 899
 900         sdata_info(sdata,
 901                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
 902                    new_ap_level, chan_pwr, *pwr_constr_elem,
 903                    sdata->u.mgd.bssid);
 904         sdata->ap_power_level = new_ap_level;
 905         if (__ieee80211_recalc_txpower(sdata))
 906                 return BSS_CHANGED_TXPOWER;
 907         return 0;
 908 }
 909
 910 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 911 {
 912         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 913         struct ieee80211_local *local = sdata->local;
 914         struct ieee80211_conf *conf = &local->hw.conf;
 915
 916         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 917                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 918                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 919
 920         local->disable_dynamic_ps = false;
 921         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 922 }
 923 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 924
 925 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 926 {
 927         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 928         struct ieee80211_local *local = sdata->local;
 929         struct ieee80211_conf *conf = &local->hw.conf;
 930
 931         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 932                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 933                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 934
 935         local->disable_dynamic_ps = true;
 936         conf->dynamic_ps_timeout = 0;
 937         del_timer_sync(&local->dynamic_ps_timer);
 938         ieee80211_queue_work(&local->hw,
 939                              &local->dynamic_ps_enable_work);
 940 }
 941 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 942
 943 /* powersave */
 944 static void ieee80211_enable_ps(struct ieee80211_local *local,
 945                                 struct ieee80211_sub_if_data *sdata)
 946 {
 947         struct ieee80211_conf *conf = &local->hw.conf;
 948
 949         /*
 950          * If we are scanning right now then the parameters will
 951          * take effect when scan finishes.
 952          */
 953         if (local->scanning)
 954                 return;
 955
 956         if (conf->dynamic_ps_timeout > 0 &&
 957             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 958                 mod_timer(&local->dynamic_ps_timer, jiffies +
 959                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 960         } else {
 961                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 962                         ieee80211_send_nullfunc(local, sdata, 1);
 963
 964                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 965                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 966                         return;
 967
 968                 conf->flags |= IEEE80211_CONF_PS;
 969                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 970         }
 971 }
 972
 973 static void ieee80211_change_ps(struct ieee80211_local *local)
 974 {
 975         struct ieee80211_conf *conf = &local->hw.conf;
 976
 977         if (local->ps_sdata) {
 978                 ieee80211_enable_ps(local, local->ps_sdata);
 979         } else if (conf->flags & IEEE80211_CONF_PS) {
 980                 conf->flags &= ~IEEE80211_CONF_PS;
 981                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 982                 del_timer_sync(&local->dynamic_ps_timer);
 983                 cancel_work_sync(&local->dynamic_ps_enable_work);
 984         }
 985 }
 986
 987 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 988 {
 989         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 990         struct sta_info *sta = NULL;
 991         bool authorized = false;
 992
 993         if (!mgd->powersave)
 994                 return false;
 995
 996         if (mgd->broken_ap)
 997                 return false;
 998
 999         if (!mgd->associated)
1000                 return false;
1001
1002         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
1003                           IEEE80211_STA_CONNECTION_POLL))
1004                 return false;
1005
1006         rcu_read_lock();
1007         sta = sta_info_get(sdata, mgd->bssid);
1008         if (sta)
1009                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1010         rcu_read_unlock();
1011
1012         return authorized;
1013 }
1014
1015 /* need to hold RTNL or interface lock */
1016 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1017 {
1018         struct ieee80211_sub_if_data *sdata, *found = NULL;
1019         int count = 0;
1020         int timeout;
1021
1022         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
1023                 local->ps_sdata = NULL;
1024                 return;
1025         }
1026
1027         list_for_each_entry(sdata, &local->interfaces, list) {
1028                 if (!ieee80211_sdata_running(sdata))
1029                         continue;
1030                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1031                         /* If an AP vif is found, then disable PS
1032                          * by setting the count to zero thereby setting
1033                          * ps_sdata to NULL.
1034                          */
1035                         count = 0;
1036                         break;
1037                 }
1038                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1039                         continue;
1040                 found = sdata;
1041                 count++;
1042         }
1043
1044         if (count == 1 && ieee80211_powersave_allowed(found)) {
1045                 struct ieee80211_conf *conf = &local->hw.conf;
1046                 s32 beaconint_us;
1047
1048                 if (latency < 0)
1049                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1050
1051                 beaconint_us = ieee80211_tu_to_usec(
1052                                         found->vif.bss_conf.beacon_int);
1053
1054                 timeout = local->dynamic_ps_forced_timeout;
1055                 if (timeout < 0) {
1056                         /*
1057                          * Go to full PSM if the user configures a very low
1058                          * latency requirement.
1059                          * The 2000 second value is there for compatibility
1060                          * until the PM_QOS_NETWORK_LATENCY is configured
1061                          * with real values.
1062                          */
1063                         if (latency > (1900 * USEC_PER_MSEC) &&
1064                             latency != (2000 * USEC_PER_SEC))
1065                                 timeout = 0;
1066                         else
1067                                 timeout = 100;
1068                 }
1069                 local->dynamic_ps_user_timeout = timeout;
1070                 if (!local->disable_dynamic_ps)
1071                         conf->dynamic_ps_timeout =
1072                                 local->dynamic_ps_user_timeout;
1073
1074                 if (beaconint_us > latency) {
1075                         local->ps_sdata = NULL;
1076                 } else {
1077                         int maxslp = 1;
1078                         u8 dtimper = found->u.mgd.dtim_period;
1079
1080                         /* If the TIM IE is invalid, pretend the value is 1 */
1081                         if (!dtimper)
1082                                 dtimper = 1;
1083                         else if (dtimper > 1)
1084                                 maxslp = min_t(int, dtimper,
1085                                                     latency / beaconint_us);
1086
1087                         local->hw.conf.max_sleep_period = maxslp;
1088                         local->hw.conf.ps_dtim_period = dtimper;
1089                         local->ps_sdata = found;
1090                 }
1091         } else {
1092                 local->ps_sdata = NULL;
1093         }
1094
1095         ieee80211_change_ps(local);
1096 }
1097
1098 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1099 {
1100         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1101
1102         if (sdata->vif.bss_conf.ps != ps_allowed) {
1103                 sdata->vif.bss_conf.ps = ps_allowed;
1104                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1105         }
1106 }
1107
1108 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1109 {
1110         struct ieee80211_local *local =
1111                 container_of(work, struct ieee80211_local,
1112                              dynamic_ps_disable_work);
1113
1114         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1115                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1116                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1117         }
1118
1119         ieee80211_wake_queues_by_reason(&local->hw,
1120                                         IEEE80211_QUEUE_STOP_REASON_PS);
1121 }
1122
1123 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1124 {
1125         struct ieee80211_local *local =
1126                 container_of(work, struct ieee80211_local,
1127                              dynamic_ps_enable_work);
1128         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1129         struct ieee80211_if_managed *ifmgd;
1130         unsigned long flags;
1131         int q;
1132
1133         /* can only happen when PS was just disabled anyway */
1134         if (!sdata)
1135                 return;
1136
1137         ifmgd = &sdata->u.mgd;
1138
1139         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1140                 return;
1141
1142         if (!local->disable_dynamic_ps &&
1143             local->hw.conf.dynamic_ps_timeout > 0) {
1144                 /* don't enter PS if TX frames are pending */
1145                 if (drv_tx_frames_pending(local)) {
1146                         mod_timer(&local->dynamic_ps_timer, jiffies +
1147                                   msecs_to_jiffies(
1148                                   local->hw.conf.dynamic_ps_timeout));
1149                         return;
1150                 }
1151
1152                 /*
1153                  * transmission can be stopped by others which leads to
1154                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1155                  * is not the actual idle state.
1156                  */
1157                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1158                 for (q = 0; q < local->hw.queues; q++) {
1159                         if (local->queue_stop_reasons[q]) {
1160                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1161                                                        flags);
1162                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1163                                           msecs_to_jiffies(
1164                                           local->hw.conf.dynamic_ps_timeout));
1165                                 return;
1166                         }
1167                 }
1168                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1169         }
1170
1171         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1172             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1173                 netif_tx_stop_all_queues(sdata->dev);
1174
1175                 if (drv_tx_frames_pending(local))
1176                         mod_timer(&local->dynamic_ps_timer, jiffies +
1177                                   msecs_to_jiffies(
1178                                   local->hw.conf.dynamic_ps_timeout));
1179                 else {
1180                         ieee80211_send_nullfunc(local, sdata, 1);
1181                         /* Flush to get the tx status of nullfunc frame */
1182                         drv_flush(local, false);
1183                 }
1184         }
1185
1186         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1187               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1188             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1189                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1190                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1191                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1192         }
1193
1194         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1195                 netif_tx_wake_all_queues(sdata->dev);
1196 }
1197
1198 void ieee80211_dynamic_ps_timer(unsigned long data)
1199 {
1200         struct ieee80211_local *local = (void *) data;
1201
1202         if (local->quiescing || local->suspended)
1203                 return;
1204
1205         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1206 }
1207
1208 /* MLME */
1209 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1210                                      struct ieee80211_sub_if_data *sdata,
1211                                      u8 *wmm_param, size_t wmm_param_len)
1212 {
1213         struct ieee80211_tx_queue_params params;
1214         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1215         size_t left;
1216         int count;
1217         u8 *pos, uapsd_queues = 0;
1218
1219         if (!local->ops->conf_tx)
1220                 return false;
1221
1222         if (local->hw.queues < IEEE80211_NUM_ACS)
1223                 return false;
1224
1225         if (!wmm_param)
1226                 return false;
1227
1228         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1229                 return false;
1230
1231         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1232                 uapsd_queues = ifmgd->uapsd_queues;
1233
1234         count = wmm_param[6] & 0x0f;
1235         if (count == ifmgd->wmm_last_param_set)
1236                 return false;
1237         ifmgd->wmm_last_param_set = count;
1238
1239         pos = wmm_param + 8;
1240         left = wmm_param_len - 8;
1241
1242         memset(&params, 0, sizeof(params));
1243
1244         sdata->wmm_acm = 0;
1245         for (; left >= 4; left -= 4, pos += 4) {
1246                 int aci = (pos[0] >> 5) & 0x03;
1247                 int acm = (pos[0] >> 4) & 0x01;
1248                 bool uapsd = false;
1249                 int queue;
1250
1251                 switch (aci) {
1252                 case 1: /* AC_BK */
1253                         queue = 3;
1254                         if (acm)
1255                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1256                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1257                                 uapsd = true;
1258                         break;
1259                 case 2: /* AC_VI */
1260                         queue = 1;
1261                         if (acm)
1262                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1263                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1264                                 uapsd = true;
1265                         break;
1266                 case 3: /* AC_VO */
1267                         queue = 0;
1268                         if (acm)
1269                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1270                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1271                                 uapsd = true;
1272                         break;
1273                 case 0: /* AC_BE */
1274                 default:
1275                         queue = 2;
1276                         if (acm)
1277                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1278                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1279                                 uapsd = true;
1280                         break;
1281                 }
1282
1283                 params.aifs = pos[0] & 0x0f;
1284                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1285                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1286                 params.txop = get_unaligned_le16(pos + 2);
1287                 params.uapsd = uapsd;
1288
1289                 mlme_dbg(sdata,
1290                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1291                          queue, aci, acm,
1292                          params.aifs, params.cw_min, params.cw_max,
1293                          params.txop, params.uapsd);
1294                 sdata->tx_conf[queue] = params;
1295                 if (drv_conf_tx(local, sdata, queue, &params))
1296                         sdata_err(sdata,
1297                                   "failed to set TX queue parameters for queue %d\n",
1298                                   queue);
1299         }
1300
1301         /* enable WMM or activate new settings */
1302         sdata->vif.bss_conf.qos = true;
1303         return true;
1304 }
1305
1306 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1307 {
1308         lockdep_assert_held(&sdata->local->mtx);
1309
1310         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1311                                 IEEE80211_STA_BEACON_POLL);
1312         ieee80211_run_deferred_scan(sdata->local);
1313 }
1314
1315 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1316 {
1317         mutex_lock(&sdata->local->mtx);
1318         __ieee80211_stop_poll(sdata);
1319         mutex_unlock(&sdata->local->mtx);
1320 }
1321
1322 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1323                                            u16 capab, bool erp_valid, u8 erp)
1324 {
1325         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1326         u32 changed = 0;
1327         bool use_protection;
1328         bool use_short_preamble;
1329         bool use_short_slot;
1330
1331         if (erp_valid) {
1332                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1333                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1334         } else {
1335                 use_protection = false;
1336                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1337         }
1338
1339         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1340         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1341                 use_short_slot = true;
1342
1343         if (use_protection != bss_conf->use_cts_prot) {
1344                 bss_conf->use_cts_prot = use_protection;
1345                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1346         }
1347
1348         if (use_short_preamble != bss_conf->use_short_preamble) {
1349                 bss_conf->use_short_preamble = use_short_preamble;
1350                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1351         }
1352
1353         if (use_short_slot != bss_conf->use_short_slot) {
1354                 bss_conf->use_short_slot = use_short_slot;
1355                 changed |= BSS_CHANGED_ERP_SLOT;
1356         }
1357
1358         return changed;
1359 }
1360
1361 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1362                                      struct cfg80211_bss *cbss,
1363                                      u32 bss_info_changed)
1364 {
1365         struct ieee80211_bss *bss = (void *)cbss->priv;
1366         struct ieee80211_local *local = sdata->local;
1367         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1368
1369         bss_info_changed |= BSS_CHANGED_ASSOC;
1370         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1371                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1372
1373         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1374                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1375
1376         sdata->u.mgd.associated = cbss;
1377         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1378
1379         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1380
1381         if (sdata->vif.p2p) {
1382                 const struct cfg80211_bss_ies *ies;
1383
1384                 rcu_read_lock();
1385                 ies = rcu_dereference(cbss->ies);
1386                 if (ies) {
1387                         u8 noa[2];
1388                         int ret;
1389
1390                         ret = cfg80211_get_p2p_attr(
1391                                         ies->data, ies->len,
1392                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1393                                         noa, sizeof(noa));
1394                         if (ret >= 2) {
1395                                 bss_conf->p2p_oppps = noa[1] & 0x80;
1396                                 bss_conf->p2p_ctwindow = noa[1] & 0x7f;
1397                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1398                                 sdata->u.mgd.p2p_noa_index = noa[0];
1399                         }
1400                 }
1401                 rcu_read_unlock();
1402         }
1403
1404         /* just to be sure */
1405         ieee80211_stop_poll(sdata);
1406
1407         ieee80211_led_assoc(local, 1);
1408
1409         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
1410                 /*
1411                  * If the AP is buggy we may get here with no DTIM period
1412                  * known, so assume it's 1 which is the only safe assumption
1413                  * in that case, although if the TIM IE is broken powersave
1414                  * probably just won't work at all.
1415                  */
1416                 bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1417         } else {
1418                 bss_conf->dtim_period = 0;
1419         }
1420
1421         bss_conf->assoc = 1;
1422
1423         /* Tell the driver to monitor connection quality (if supported) */
1424         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1425             bss_conf->cqm_rssi_thold)
1426                 bss_info_changed |= BSS_CHANGED_CQM;
1427
1428         /* Enable ARP filtering */
1429         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1430                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1431                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1432         }
1433
1434         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1435
1436         mutex_lock(&local->iflist_mtx);
1437         ieee80211_recalc_ps(local, -1);
1438         mutex_unlock(&local->iflist_mtx);
1439
1440         ieee80211_recalc_smps(sdata);
1441         ieee80211_recalc_ps_vif(sdata);
1442
1443         netif_tx_start_all_queues(sdata->dev);
1444         netif_carrier_on(sdata->dev);
1445 }
1446
1447 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1448                                    u16 stype, u16 reason, bool tx,
1449                                    u8 *frame_buf)
1450 {
1451         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1452         struct ieee80211_local *local = sdata->local;
1453         struct sta_info *sta;
1454         u32 changed = 0;
1455
1456         ASSERT_MGD_MTX(ifmgd);
1457
1458         if (WARN_ON_ONCE(tx && !frame_buf))
1459                 return;
1460
1461         if (WARN_ON(!ifmgd->associated))
1462                 return;
1463
1464         ieee80211_stop_poll(sdata);
1465
1466         ifmgd->associated = NULL;
1467
1468         /*
1469          * we need to commit the associated = NULL change because the
1470          * scan code uses that to determine whether this iface should
1471          * go to/wake up from powersave or not -- and could otherwise
1472          * wake the queues erroneously.
1473          */
1474         smp_mb();
1475
1476         /*
1477          * Thus, we can only afterwards stop the queues -- to account
1478          * for the case where another CPU is finishing a scan at this
1479          * time -- we don't want the scan code to enable queues.
1480          */
1481
1482         netif_tx_stop_all_queues(sdata->dev);
1483         netif_carrier_off(sdata->dev);
1484
1485         mutex_lock(&local->sta_mtx);
1486         sta = sta_info_get(sdata, ifmgd->bssid);
1487         if (sta) {
1488                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1489                 ieee80211_sta_tear_down_BA_sessions(sta, false);
1490         }
1491         mutex_unlock(&local->sta_mtx);
1492
1493         /*
1494          * if we want to get out of ps before disassoc (why?) we have
1495          * to do it before sending disassoc, as otherwise the null-packet
1496          * won't be valid.
1497          */
1498         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1499                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1500                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1501         }
1502         local->ps_sdata = NULL;
1503
1504         /* disable per-vif ps */
1505         ieee80211_recalc_ps_vif(sdata);
1506
1507         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1508         if (tx)
1509                 drv_flush(local, false);
1510
1511         /* deauthenticate/disassociate now */
1512         if (tx || frame_buf)
1513                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1514                                                reason, tx, frame_buf);
1515
1516         /* flush out frame */
1517         if (tx)
1518                 drv_flush(local, false);
1519
1520         /* clear bssid only after building the needed mgmt frames */
1521         memset(ifmgd->bssid, 0, ETH_ALEN);
1522
1523         /* remove AP and TDLS peers */
1524         sta_info_flush_defer(sdata);
1525
1526         /* finally reset all BSS / config parameters */
1527         changed |= ieee80211_reset_erp_info(sdata);
1528
1529         ieee80211_led_assoc(local, 0);
1530         changed |= BSS_CHANGED_ASSOC;
1531         sdata->vif.bss_conf.assoc = false;
1532
1533         sdata->vif.bss_conf.p2p_ctwindow = 0;
1534         sdata->vif.bss_conf.p2p_oppps = false;
1535
1536         /* on the next assoc, re-program HT parameters */
1537         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1538         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1539
1540         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1541
1542         del_timer_sync(&local->dynamic_ps_timer);
1543         cancel_work_sync(&local->dynamic_ps_enable_work);
1544
1545         /* Disable ARP filtering */
1546         if (sdata->vif.bss_conf.arp_filter_enabled) {
1547                 sdata->vif.bss_conf.arp_filter_enabled = false;
1548                 changed |= BSS_CHANGED_ARP_FILTER;
1549         }
1550
1551         sdata->vif.bss_conf.qos = false;
1552         changed |= BSS_CHANGED_QOS;
1553
1554         /* The BSSID (not really interesting) and HT changed */
1555         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1556         ieee80211_bss_info_change_notify(sdata, changed);
1557
1558         /* disassociated - set to defaults now */
1559         ieee80211_set_wmm_default(sdata, false);
1560
1561         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1562         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1563         del_timer_sync(&sdata->u.mgd.timer);
1564         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1565
1566         sdata->u.mgd.timers_running = 0;
1567
1568         sdata->vif.bss_conf.dtim_period = 0;
1569
1570         ifmgd->flags = 0;
1571         ieee80211_vif_release_channel(sdata);
1572 }
1573
1574 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1575                              struct ieee80211_hdr *hdr)
1576 {
1577         /*
1578          * We can postpone the mgd.timer whenever receiving unicast frames
1579          * from AP because we know that the connection is working both ways
1580          * at that time. But multicast frames (and hence also beacons) must
1581          * be ignored here, because we need to trigger the timer during
1582          * data idle periods for sending the periodic probe request to the
1583          * AP we're connected to.
1584          */
1585         if (is_multicast_ether_addr(hdr->addr1))
1586                 return;
1587
1588         ieee80211_sta_reset_conn_monitor(sdata);
1589 }
1590
1591 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1592 {
1593         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1594         struct ieee80211_local *local = sdata->local;
1595
1596         mutex_lock(&local->mtx);
1597         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1598                               IEEE80211_STA_CONNECTION_POLL))) {
1599                 mutex_unlock(&local->mtx);
1600                 return;
1601         }
1602
1603         __ieee80211_stop_poll(sdata);
1604
1605         mutex_lock(&local->iflist_mtx);
1606         ieee80211_recalc_ps(local, -1);
1607         mutex_unlock(&local->iflist_mtx);
1608
1609         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1610                 goto out;
1611
1612         /*
1613          * We've received a probe response, but are not sure whether
1614          * we have or will be receiving any beacons or data, so let's
1615          * schedule the timers again, just in case.
1616          */
1617         ieee80211_sta_reset_beacon_monitor(sdata);
1618
1619         mod_timer(&ifmgd->conn_mon_timer,
1620                   round_jiffies_up(jiffies +
1621                                    IEEE80211_CONNECTION_IDLE_TIME));
1622 out:
1623         mutex_unlock(&local->mtx);
1624 }
1625
1626 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1627                              struct ieee80211_hdr *hdr, bool ack)
1628 {
1629         if (!ieee80211_is_data(hdr->frame_control))
1630             return;
1631
1632         if (ack)
1633                 ieee80211_sta_reset_conn_monitor(sdata);
1634
1635         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1636             sdata->u.mgd.probe_send_count > 0) {
1637                 if (ack)
1638                         sdata->u.mgd.probe_send_count = 0;
1639                 else
1640                         sdata->u.mgd.nullfunc_failed = true;
1641                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1642         }
1643 }
1644
1645 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1646 {
1647         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1648         const u8 *ssid;
1649         u8 *dst = ifmgd->associated->bssid;
1650         u8 unicast_limit = max(1, max_probe_tries - 3);
1651
1652         /*
1653          * Try sending broadcast probe requests for the last three
1654          * probe requests after the first ones failed since some
1655          * buggy APs only support broadcast probe requests.
1656          */
1657         if (ifmgd->probe_send_count >= unicast_limit)
1658                 dst = NULL;
1659
1660         /*
1661          * When the hardware reports an accurate Tx ACK status, it's
1662          * better to send a nullfunc frame instead of a probe request,
1663          * as it will kick us off the AP quickly if we aren't associated
1664          * anymore. The timeout will be reset if the frame is ACKed by
1665          * the AP.
1666          */
1667         ifmgd->probe_send_count++;
1668
1669         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1670                 ifmgd->nullfunc_failed = false;
1671                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1672         } else {
1673                 int ssid_len;
1674
1675                 rcu_read_lock();
1676                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1677                 if (WARN_ON_ONCE(ssid == NULL))
1678                         ssid_len = 0;
1679                 else
1680                         ssid_len = ssid[1];
1681
1682                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1683                                          0, (u32) -1, true, false,
1684                                          ifmgd->associated->channel, false);
1685                 rcu_read_unlock();
1686         }
1687
1688         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1689         run_again(ifmgd, ifmgd->probe_timeout);
1690         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1691                 drv_flush(sdata->local, false);
1692 }
1693
1694 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1695                                    bool beacon)
1696 {
1697         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1698         bool already = false;
1699
1700         if (!ieee80211_sdata_running(sdata))
1701                 return;
1702
1703         mutex_lock(&ifmgd->mtx);
1704
1705         if (!ifmgd->associated)
1706                 goto out;
1707
1708         mutex_lock(&sdata->local->mtx);
1709
1710         if (sdata->local->tmp_channel || sdata->local->scanning) {
1711                 mutex_unlock(&sdata->local->mtx);
1712                 goto out;
1713         }
1714
1715         if (beacon)
1716                 mlme_dbg_ratelimited(sdata,
1717                                      "detected beacon loss from AP - sending probe request\n");
1718
1719         ieee80211_cqm_rssi_notify(&sdata->vif,
1720                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1721
1722         /*
1723          * The driver/our work has already reported this event or the
1724          * connection monitoring has kicked in and we have already sent
1725          * a probe request. Or maybe the AP died and the driver keeps
1726          * reporting until we disassociate...
1727          *
1728          * In either case we have to ignore the current call to this
1729          * function (except for setting the correct probe reason bit)
1730          * because otherwise we would reset the timer every time and
1731          * never check whether we received a probe response!
1732          */
1733         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1734                             IEEE80211_STA_CONNECTION_POLL))
1735                 already = true;
1736
1737         if (beacon)
1738                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1739         else
1740                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1741
1742         mutex_unlock(&sdata->local->mtx);
1743
1744         if (already)
1745                 goto out;
1746
1747         mutex_lock(&sdata->local->iflist_mtx);
1748         ieee80211_recalc_ps(sdata->local, -1);
1749         mutex_unlock(&sdata->local->iflist_mtx);
1750
1751         ifmgd->probe_send_count = 0;
1752         ieee80211_mgd_probe_ap_send(sdata);
1753  out:
1754         mutex_unlock(&ifmgd->mtx);
1755 }
1756
1757 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1758                                           struct ieee80211_vif *vif)
1759 {
1760         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1761         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1762         struct cfg80211_bss *cbss;
1763         struct sk_buff *skb;
1764         const u8 *ssid;
1765         int ssid_len;
1766
1767         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1768                 return NULL;
1769
1770         ASSERT_MGD_MTX(ifmgd);
1771
1772         if (ifmgd->associated)
1773                 cbss = ifmgd->associated;
1774         else if (ifmgd->auth_data)
1775                 cbss = ifmgd->auth_data->bss;
1776         else if (ifmgd->assoc_data)
1777                 cbss = ifmgd->assoc_data->bss;
1778         else
1779                 return NULL;
1780
1781         rcu_read_lock();
1782         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1783         if (WARN_ON_ONCE(ssid == NULL))
1784                 ssid_len = 0;
1785         else
1786                 ssid_len = ssid[1];
1787
1788         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1789                                         (u32) -1, cbss->channel,
1790                                         ssid + 2, ssid_len,
1791                                         NULL, 0, true);
1792         rcu_read_unlock();
1793
1794         return skb;
1795 }
1796 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1797
1798 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata,
1799                                    bool transmit_frame)
1800 {
1801         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1802         struct ieee80211_local *local = sdata->local;
1803         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1804
1805         mutex_lock(&ifmgd->mtx);
1806         if (!ifmgd->associated) {
1807                 mutex_unlock(&ifmgd->mtx);
1808                 return;
1809         }
1810
1811         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1812                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1813                                transmit_frame, frame_buf);
1814         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1815         mutex_unlock(&ifmgd->mtx);
1816
1817         /*
1818          * must be outside lock due to cfg80211,
1819          * but that's not a problem.
1820          */
1821         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
1822
1823         mutex_lock(&local->mtx);
1824         ieee80211_recalc_idle(local);
1825         mutex_unlock(&local->mtx);
1826 }
1827
1828 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1829 {
1830         struct ieee80211_sub_if_data *sdata =
1831                 container_of(work, struct ieee80211_sub_if_data,
1832                              u.mgd.beacon_connection_loss_work);
1833         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1834         struct sta_info *sta;
1835
1836         if (ifmgd->associated) {
1837                 rcu_read_lock();
1838                 sta = sta_info_get(sdata, ifmgd->bssid);
1839                 if (sta)
1840                         sta->beacon_loss_count++;
1841                 rcu_read_unlock();
1842         }
1843
1844         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) {
1845                 sdata_info(sdata, "Connection to AP %pM lost\n",
1846                            ifmgd->bssid);
1847                 __ieee80211_disconnect(sdata, false);
1848         } else {
1849                 ieee80211_mgd_probe_ap(sdata, true);
1850         }
1851 }
1852
1853 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
1854 {
1855         struct ieee80211_sub_if_data *sdata =
1856                 container_of(work, struct ieee80211_sub_if_data,
1857                              u.mgd.csa_connection_drop_work);
1858
1859         ieee80211_wake_queues_by_reason(&sdata->local->hw,
1860                                         IEEE80211_QUEUE_STOP_REASON_CSA);
1861         __ieee80211_disconnect(sdata, true);
1862 }
1863
1864 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1865 {
1866         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1867         struct ieee80211_hw *hw = &sdata->local->hw;
1868
1869         trace_api_beacon_loss(sdata);
1870
1871         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1872         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1873 }
1874 EXPORT_SYMBOL(ieee80211_beacon_loss);
1875
1876 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1877 {
1878         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1879         struct ieee80211_hw *hw = &sdata->local->hw;
1880
1881         trace_api_connection_loss(sdata);
1882
1883         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1884         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1885 }
1886 EXPORT_SYMBOL(ieee80211_connection_loss);
1887
1888
1889 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1890                                         bool assoc)
1891 {
1892         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1893
1894         lockdep_assert_held(&sdata->u.mgd.mtx);
1895
1896         if (!assoc) {
1897                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1898
1899                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1900                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1901                 sdata->u.mgd.flags = 0;
1902                 ieee80211_vif_release_channel(sdata);
1903         }
1904
1905         cfg80211_put_bss(auth_data->bss);
1906         kfree(auth_data);
1907         sdata->u.mgd.auth_data = NULL;
1908 }
1909
1910 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1911                                      struct ieee80211_mgmt *mgmt, size_t len)
1912 {
1913         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1914         u8 *pos;
1915         struct ieee802_11_elems elems;
1916
1917         pos = mgmt->u.auth.variable;
1918         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1919         if (!elems.challenge)
1920                 return;
1921         auth_data->expected_transaction = 4;
1922         drv_mgd_prepare_tx(sdata->local, sdata);
1923         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
1924                             elems.challenge - 2, elems.challenge_len + 2,
1925                             auth_data->bss->bssid, auth_data->bss->bssid,
1926                             auth_data->key, auth_data->key_len,
1927                             auth_data->key_idx);
1928 }
1929
1930 static enum rx_mgmt_action __must_check
1931 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1932                        struct ieee80211_mgmt *mgmt, size_t len)
1933 {
1934         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1935         u8 bssid[ETH_ALEN];
1936         u16 auth_alg, auth_transaction, status_code;
1937         struct sta_info *sta;
1938
1939         lockdep_assert_held(&ifmgd->mtx);
1940
1941         if (len < 24 + 6)
1942                 return RX_MGMT_NONE;
1943
1944         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1945                 return RX_MGMT_NONE;
1946
1947         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1948
1949         if (!ether_addr_equal(bssid, mgmt->bssid))
1950                 return RX_MGMT_NONE;
1951
1952         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1953         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1954         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1955
1956         if (auth_alg != ifmgd->auth_data->algorithm ||
1957             auth_transaction != ifmgd->auth_data->expected_transaction) {
1958                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
1959                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
1960                            auth_transaction,
1961                            ifmgd->auth_data->expected_transaction);
1962                 return RX_MGMT_NONE;
1963         }
1964
1965         if (status_code != WLAN_STATUS_SUCCESS) {
1966                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1967                            mgmt->sa, status_code);
1968                 ieee80211_destroy_auth_data(sdata, false);
1969                 return RX_MGMT_CFG80211_RX_AUTH;
1970         }
1971
1972         switch (ifmgd->auth_data->algorithm) {
1973         case WLAN_AUTH_OPEN:
1974         case WLAN_AUTH_LEAP:
1975         case WLAN_AUTH_FT:
1976         case WLAN_AUTH_SAE:
1977                 break;
1978         case WLAN_AUTH_SHARED_KEY:
1979                 if (ifmgd->auth_data->expected_transaction != 4) {
1980                         ieee80211_auth_challenge(sdata, mgmt, len);
1981                         /* need another frame */
1982                         return RX_MGMT_NONE;
1983                 }
1984                 break;
1985         default:
1986                 WARN_ONCE(1, "invalid auth alg %d",
1987                           ifmgd->auth_data->algorithm);
1988                 return RX_MGMT_NONE;
1989         }
1990
1991         sdata_info(sdata, "authenticated\n");
1992         ifmgd->auth_data->done = true;
1993         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1994         run_again(ifmgd, ifmgd->auth_data->timeout);
1995
1996         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
1997             ifmgd->auth_data->expected_transaction != 2) {
1998                 /*
1999                  * Report auth frame to user space for processing since another
2000                  * round of Authentication frames is still needed.
2001                  */
2002                 return RX_MGMT_CFG80211_RX_AUTH;
2003         }
2004
2005         /* move station state to auth */
2006         mutex_lock(&sdata->local->sta_mtx);
2007         sta = sta_info_get(sdata, bssid);
2008         if (!sta) {
2009                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2010                 goto out_err;
2011         }
2012         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2013                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2014                 goto out_err;
2015         }
2016         mutex_unlock(&sdata->local->sta_mtx);
2017
2018         return RX_MGMT_CFG80211_RX_AUTH;
2019  out_err:
2020         mutex_unlock(&sdata->local->sta_mtx);
2021         /* ignore frame -- wait for timeout */
2022         return RX_MGMT_NONE;
2023 }
2024
2025
2026 static enum rx_mgmt_action __must_check
2027 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2028                          struct ieee80211_mgmt *mgmt, size_t len)
2029 {
2030         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2031         const u8 *bssid = NULL;
2032         u16 reason_code;
2033
2034         lockdep_assert_held(&ifmgd->mtx);
2035
2036         if (len < 24 + 2)
2037                 return RX_MGMT_NONE;
2038
2039         if (!ifmgd->associated ||
2040             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2041                 return RX_MGMT_NONE;
2042
2043         bssid = ifmgd->associated->bssid;
2044
2045         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2046
2047         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2048                    bssid, reason_code);
2049
2050         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2051
2052         mutex_lock(&sdata->local->mtx);
2053         ieee80211_recalc_idle(sdata->local);
2054         mutex_unlock(&sdata->local->mtx);
2055
2056         return RX_MGMT_CFG80211_DEAUTH;
2057 }
2058
2059
2060 static enum rx_mgmt_action __must_check
2061 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2062                            struct ieee80211_mgmt *mgmt, size_t len)
2063 {
2064         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2065         u16 reason_code;
2066
2067         lockdep_assert_held(&ifmgd->mtx);
2068
2069         if (len < 24 + 2)
2070                 return RX_MGMT_NONE;
2071
2072         if (!ifmgd->associated ||
2073             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2074                 return RX_MGMT_NONE;
2075
2076         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2077
2078         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2079                    mgmt->sa, reason_code);
2080
2081         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2082
2083         mutex_lock(&sdata->local->mtx);
2084         ieee80211_recalc_idle(sdata->local);
2085         mutex_unlock(&sdata->local->mtx);
2086
2087         return RX_MGMT_CFG80211_DISASSOC;
2088 }
2089
2090 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2091                                 u8 *supp_rates, unsigned int supp_rates_len,
2092                                 u32 *rates, u32 *basic_rates,
2093                                 bool *have_higher_than_11mbit,
2094                                 int *min_rate, int *min_rate_index)
2095 {
2096         int i, j;
2097
2098         for (i = 0; i < supp_rates_len; i++) {
2099                 int rate = (supp_rates[i] & 0x7f) * 5;
2100                 bool is_basic = !!(supp_rates[i] & 0x80);
2101
2102                 if (rate > 110)
2103                         *have_higher_than_11mbit = true;
2104
2105                 /*
2106                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2107                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2108                  *
2109                  * Note: Even through the membership selector and the basic
2110                  *       rate flag share the same bit, they are not exactly
2111                  *       the same.
2112                  */
2113                 if (!!(supp_rates[i] & 0x80) &&
2114                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2115                         continue;
2116
2117                 for (j = 0; j < sband->n_bitrates; j++) {
2118                         if (sband->bitrates[j].bitrate == rate) {
2119                                 *rates |= BIT(j);
2120                                 if (is_basic)
2121                                         *basic_rates |= BIT(j);
2122                                 if (rate < *min_rate) {
2123                                         *min_rate = rate;
2124                                         *min_rate_index = j;
2125                                 }
2126                                 break;
2127                         }
2128                 }
2129         }
2130 }
2131
2132 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2133                                          bool assoc)
2134 {
2135         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2136
2137         lockdep_assert_held(&sdata->u.mgd.mtx);
2138
2139         if (!assoc) {
2140                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2141
2142                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2143                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2144                 sdata->u.mgd.flags = 0;
2145                 ieee80211_vif_release_channel(sdata);
2146         }
2147
2148         kfree(assoc_data);
2149         sdata->u.mgd.assoc_data = NULL;
2150 }
2151
2152 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2153                                     struct cfg80211_bss *cbss,
2154                                     struct ieee80211_mgmt *mgmt, size_t len)
2155 {
2156         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2157         struct ieee80211_local *local = sdata->local;
2158         struct ieee80211_supported_band *sband;
2159         struct sta_info *sta;
2160         u8 *pos;
2161         u16 capab_info, aid;
2162         struct ieee802_11_elems elems;
2163         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2164         u32 changed = 0;
2165         int err;
2166
2167         /* AssocResp and ReassocResp have identical structure */
2168
2169         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2170         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2171
2172         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2173                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2174                            aid);
2175         aid &= ~(BIT(15) | BIT(14));
2176
2177         ifmgd->broken_ap = false;
2178
2179         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2180                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2181                            aid);
2182                 aid = 0;
2183                 ifmgd->broken_ap = true;
2184         }
2185
2186         pos = mgmt->u.assoc_resp.variable;
2187         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2188
2189         if (!elems.supp_rates) {
2190                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2191                 return false;
2192         }
2193
2194         ifmgd->aid = aid;
2195
2196         mutex_lock(&sdata->local->sta_mtx);
2197         /*
2198          * station info was already allocated and inserted before
2199          * the association and should be available to us
2200          */
2201         sta = sta_info_get(sdata, cbss->bssid);
2202         if (WARN_ON(!sta)) {
2203                 mutex_unlock(&sdata->local->sta_mtx);
2204                 return false;
2205         }
2206
2207         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2208
2209         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2210                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2211                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2212
2213         sta->supports_40mhz =
2214                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2215
2216         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2217                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2218                                                     elems.vht_cap_elem,
2219                                                     &sta->sta.vht_cap);
2220
2221         rate_control_rate_init(sta);
2222
2223         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2224                 set_sta_flag(sta, WLAN_STA_MFP);
2225
2226         if (elems.wmm_param)
2227                 set_sta_flag(sta, WLAN_STA_WME);
2228
2229         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2230         if (!err)
2231                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2232         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2233                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2234         if (err) {
2235                 sdata_info(sdata,
2236                            "failed to move station %pM to desired state\n",
2237                            sta->sta.addr);
2238                 WARN_ON(__sta_info_destroy(sta));
2239                 mutex_unlock(&sdata->local->sta_mtx);
2240                 return false;
2241         }
2242
2243         mutex_unlock(&sdata->local->sta_mtx);
2244
2245         /*
2246          * Always handle WMM once after association regardless
2247          * of the first value the AP uses. Setting -1 here has
2248          * that effect because the AP values is an unsigned
2249          * 4-bit value.
2250          */
2251         ifmgd->wmm_last_param_set = -1;
2252
2253         if (elems.wmm_param)
2254                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2255                                          elems.wmm_param_len);
2256         else
2257                 ieee80211_set_wmm_default(sdata, false);
2258         changed |= BSS_CHANGED_QOS;
2259
2260         if (elems.ht_operation && elems.wmm_param &&
2261             !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2262                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2263                                                   cbss->bssid, false);
2264
2265         /* set AID and assoc capability,
2266          * ieee80211_set_associated() will tell the driver */
2267         bss_conf->aid = aid;
2268         bss_conf->assoc_capability = capab_info;
2269         ieee80211_set_associated(sdata, cbss, changed);
2270
2271         /*
2272          * If we're using 4-addr mode, let the AP know that we're
2273          * doing so, so that it can create the STA VLAN on its side
2274          */
2275         if (ifmgd->use_4addr)
2276                 ieee80211_send_4addr_nullfunc(local, sdata);
2277
2278         /*
2279          * Start timer to probe the connection to the AP now.
2280          * Also start the timer that will detect beacon loss.
2281          */
2282         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2283         ieee80211_sta_reset_beacon_monitor(sdata);
2284
2285         return true;
2286 }
2287
2288 static enum rx_mgmt_action __must_check
2289 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2290                              struct ieee80211_mgmt *mgmt, size_t len,
2291                              struct cfg80211_bss **bss)
2292 {
2293         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2294         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2295         u16 capab_info, status_code, aid;
2296         struct ieee802_11_elems elems;
2297         u8 *pos;
2298         bool reassoc;
2299
2300         lockdep_assert_held(&ifmgd->mtx);
2301
2302         if (!assoc_data)
2303                 return RX_MGMT_NONE;
2304         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2305                 return RX_MGMT_NONE;
2306
2307         /*
2308          * AssocResp and ReassocResp have identical structure, so process both
2309          * of them in this function.
2310          */
2311
2312         if (len < 24 + 6)
2313                 return RX_MGMT_NONE;
2314
2315         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2316         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2317         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2318         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2319
2320         sdata_info(sdata,
2321                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2322                    reassoc ? "Rea" : "A", mgmt->sa,
2323                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2324
2325         pos = mgmt->u.assoc_resp.variable;
2326         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2327
2328         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2329             elems.timeout_int && elems.timeout_int_len == 5 &&
2330             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2331                 u32 tu, ms;
2332                 tu = get_unaligned_le32(elems.timeout_int + 1);
2333                 ms = tu * 1024 / 1000;
2334                 sdata_info(sdata,
2335                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2336                            mgmt->sa, tu, ms);
2337                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2338                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2339                         run_again(ifmgd, assoc_data->timeout);
2340                 return RX_MGMT_NONE;
2341         }
2342
2343         *bss = assoc_data->bss;
2344
2345         if (status_code != WLAN_STATUS_SUCCESS) {
2346                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2347                            mgmt->sa, status_code);
2348                 ieee80211_destroy_assoc_data(sdata, false);
2349         } else {
2350                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2351                         /* oops -- internal error -- send timeout for now */
2352                         ieee80211_destroy_assoc_data(sdata, false);
2353                         cfg80211_put_bss(*bss);
2354                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2355                 }
2356                 sdata_info(sdata, "associated\n");
2357
2358                 /*
2359                  * destroy assoc_data afterwards, as otherwise an idle
2360                  * recalc after assoc_data is NULL but before associated
2361                  * is set can cause the interface to go idle
2362                  */
2363                 ieee80211_destroy_assoc_data(sdata, true);
2364         }
2365
2366         return RX_MGMT_CFG80211_RX_ASSOC;
2367 }
2368
2369 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2370                                   struct ieee80211_mgmt *mgmt, size_t len,
2371                                   struct ieee80211_rx_status *rx_status,
2372                                   struct ieee802_11_elems *elems)
2373 {
2374         struct ieee80211_local *local = sdata->local;
2375         int freq;
2376         struct ieee80211_bss *bss;
2377         struct ieee80211_channel *channel;
2378         bool need_ps = false;
2379
2380         if ((sdata->u.mgd.associated &&
2381              ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) ||
2382             (sdata->u.mgd.assoc_data &&
2383              ether_addr_equal(mgmt->bssid,
2384                               sdata->u.mgd.assoc_data->bss->bssid))) {
2385                 /* not previously set so we may need to recalc */
2386                 need_ps = sdata->u.mgd.associated && !sdata->u.mgd.dtim_period;
2387
2388                 if (elems->tim && !elems->parse_error) {
2389                         struct ieee80211_tim_ie *tim_ie = elems->tim;
2390                         sdata->u.mgd.dtim_period = tim_ie->dtim_period;
2391                 }
2392         }
2393
2394         if (elems->ds_params && elems->ds_params_len == 1)
2395                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2396                                                       rx_status->band);
2397         else
2398                 freq = rx_status->freq;
2399
2400         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2401
2402         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2403                 return;
2404
2405         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2406                                         channel);
2407         if (bss)
2408                 ieee80211_rx_bss_put(local, bss);
2409
2410         if (!sdata->u.mgd.associated)
2411                 return;
2412
2413         if (need_ps) {
2414                 mutex_lock(&local->iflist_mtx);
2415                 ieee80211_recalc_ps(local, -1);
2416                 mutex_unlock(&local->iflist_mtx);
2417         }
2418
2419         if (elems->ch_switch_ie &&
2420             memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2421                 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2422                                                  bss, rx_status->mactime);
2423 }
2424
2425
2426 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2427                                          struct sk_buff *skb)
2428 {
2429         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2430         struct ieee80211_if_managed *ifmgd;
2431         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2432         size_t baselen, len = skb->len;
2433         struct ieee802_11_elems elems;
2434
2435         ifmgd = &sdata->u.mgd;
2436
2437         ASSERT_MGD_MTX(ifmgd);
2438
2439         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2440                 return; /* ignore ProbeResp to foreign address */
2441
2442         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2443         if (baselen > len)
2444                 return;
2445
2446         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2447                                 &elems);
2448
2449         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2450
2451         if (ifmgd->associated &&
2452             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2453                 ieee80211_reset_ap_probe(sdata);
2454
2455         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2456             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2457                 /* got probe response, continue with auth */
2458                 sdata_info(sdata, "direct probe responded\n");
2459                 ifmgd->auth_data->tries = 0;
2460                 ifmgd->auth_data->timeout = jiffies;
2461                 run_again(ifmgd, ifmgd->auth_data->timeout);
2462         }
2463 }
2464
2465 /*
2466  * This is the canonical list of information elements we care about,
2467  * the filter code also gives us all changes to the Microsoft OUI
2468  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2469  *
2470  * We implement beacon filtering in software since that means we can
2471  * avoid processing the frame here and in cfg80211, and userspace
2472  * will not be able to tell whether the hardware supports it or not.
2473  *
2474  * XXX: This list needs to be dynamic -- userspace needs to be able to
2475  *      add items it requires. It also needs to be able to tell us to
2476  *      look out for other vendor IEs.
2477  */
2478 static const u64 care_about_ies =
2479         (1ULL << WLAN_EID_COUNTRY) |
2480         (1ULL << WLAN_EID_ERP_INFO) |
2481         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2482         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2483         (1ULL << WLAN_EID_HT_CAPABILITY) |
2484         (1ULL << WLAN_EID_HT_OPERATION);
2485
2486 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2487                                      struct ieee80211_mgmt *mgmt,
2488                                      size_t len,
2489                                      struct ieee80211_rx_status *rx_status)
2490 {
2491         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2492         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2493         size_t baselen;
2494         struct ieee802_11_elems elems;
2495         struct ieee80211_local *local = sdata->local;
2496         struct ieee80211_chanctx_conf *chanctx_conf;
2497         struct ieee80211_channel *chan;
2498         u32 changed = 0;
2499         bool erp_valid;
2500         u8 erp_value = 0;
2501         u32 ncrc;
2502         u8 *bssid;
2503
2504         lockdep_assert_held(&ifmgd->mtx);
2505
2506         /* Process beacon from the current BSS */
2507         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2508         if (baselen > len)
2509                 return;
2510
2511         rcu_read_lock();
2512         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2513         if (!chanctx_conf) {
2514                 rcu_read_unlock();
2515                 return;
2516         }
2517
2518         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2519                 rcu_read_unlock();
2520                 return;
2521         }
2522         chan = chanctx_conf->def.chan;
2523         rcu_read_unlock();
2524
2525         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2526             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2527                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2528                                        len - baselen, &elems);
2529
2530                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2531                 ifmgd->assoc_data->have_beacon = true;
2532                 ifmgd->assoc_data->sent_assoc = false;
2533                 /* continue assoc process */
2534                 ifmgd->assoc_data->timeout = jiffies;
2535                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2536                 return;
2537         }
2538
2539         if (!ifmgd->associated ||
2540             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2541                 return;
2542         bssid = ifmgd->associated->bssid;
2543
2544         /* Track average RSSI from the Beacon frames of the current AP */
2545         ifmgd->last_beacon_signal = rx_status->signal;
2546         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2547                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2548                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2549                 ifmgd->last_cqm_event_signal = 0;
2550                 ifmgd->count_beacon_signal = 1;
2551                 ifmgd->last_ave_beacon_signal = 0;
2552         } else {
2553                 ifmgd->ave_beacon_signal =
2554                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2555                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2556                          ifmgd->ave_beacon_signal) / 16;
2557                 ifmgd->count_beacon_signal++;
2558         }
2559
2560         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2561             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2562                 int sig = ifmgd->ave_beacon_signal;
2563                 int last_sig = ifmgd->last_ave_beacon_signal;
2564
2565                 /*
2566                  * if signal crosses either of the boundaries, invoke callback
2567                  * with appropriate parameters
2568                  */
2569                 if (sig > ifmgd->rssi_max_thold &&
2570                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2571                         ifmgd->last_ave_beacon_signal = sig;
2572                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2573                 } else if (sig < ifmgd->rssi_min_thold &&
2574                            (last_sig >= ifmgd->rssi_max_thold ||
2575                            last_sig == 0)) {
2576                         ifmgd->last_ave_beacon_signal = sig;
2577                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2578                 }
2579         }
2580
2581         if (bss_conf->cqm_rssi_thold &&
2582             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2583             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2584                 int sig = ifmgd->ave_beacon_signal / 16;
2585                 int last_event = ifmgd->last_cqm_event_signal;
2586                 int thold = bss_conf->cqm_rssi_thold;
2587                 int hyst = bss_conf->cqm_rssi_hyst;
2588                 if (sig < thold &&
2589                     (last_event == 0 || sig < last_event - hyst)) {
2590                         ifmgd->last_cqm_event_signal = sig;
2591                         ieee80211_cqm_rssi_notify(
2592                                 &sdata->vif,
2593                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2594                                 GFP_KERNEL);
2595                 } else if (sig > thold &&
2596                            (last_event == 0 || sig > last_event + hyst)) {
2597                         ifmgd->last_cqm_event_signal = sig;
2598                         ieee80211_cqm_rssi_notify(
2599                                 &sdata->vif,
2600                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2601                                 GFP_KERNEL);
2602                 }
2603         }
2604
2605         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2606                 mlme_dbg_ratelimited(sdata,
2607                                      "cancelling probereq poll due to a received beacon\n");
2608                 mutex_lock(&local->mtx);
2609                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2610                 ieee80211_run_deferred_scan(local);
2611                 mutex_unlock(&local->mtx);
2612
2613                 mutex_lock(&local->iflist_mtx);
2614                 ieee80211_recalc_ps(local, -1);
2615                 mutex_unlock(&local->iflist_mtx);
2616         }
2617
2618         /*
2619          * Push the beacon loss detection into the future since
2620          * we are processing a beacon from the AP just now.
2621          */
2622         ieee80211_sta_reset_beacon_monitor(sdata);
2623
2624         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2625         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2626                                           len - baselen, &elems,
2627                                           care_about_ies, ncrc);
2628
2629         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2630                 bool directed_tim = ieee80211_check_tim(elems.tim,
2631                                                         elems.tim_len,
2632                                                         ifmgd->aid);
2633                 if (directed_tim) {
2634                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2635                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2636                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2637                                         ieee80211_hw_config(local,
2638                                                             IEEE80211_CONF_CHANGE_PS);
2639                                 }
2640                                 ieee80211_send_nullfunc(local, sdata, 0);
2641                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2642                                 local->pspolling = true;
2643
2644                                 /*
2645                                  * Here is assumed that the driver will be
2646                                  * able to send ps-poll frame and receive a
2647                                  * response even though power save mode is
2648                                  * enabled, but some drivers might require
2649                                  * to disable power save here. This needs
2650                                  * to be investigated.
2651                                  */
2652                                 ieee80211_send_pspoll(local, sdata);
2653                         }
2654                 }
2655         }
2656
2657         if (sdata->vif.p2p) {
2658                 u8 noa[2];
2659                 int ret;
2660
2661                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
2662                                             len - baselen,
2663                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2664                                             noa, sizeof(noa));
2665                 if (ret >= 2 && sdata->u.mgd.p2p_noa_index != noa[0]) {
2666                         bss_conf->p2p_oppps = noa[1] & 0x80;
2667                         bss_conf->p2p_ctwindow = noa[1] & 0x7f;
2668                         changed |= BSS_CHANGED_P2P_PS;
2669                         sdata->u.mgd.p2p_noa_index = noa[0];
2670                         /*
2671                          * make sure we update all information, the CRC
2672                          * mechanism doesn't look at P2P attributes.
2673                          */
2674                         ifmgd->beacon_crc_valid = false;
2675                 }
2676         }
2677
2678         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2679                 return;
2680         ifmgd->beacon_crc = ncrc;
2681         ifmgd->beacon_crc_valid = true;
2682
2683         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2684
2685         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2686                                      elems.wmm_param_len))
2687                 changed |= BSS_CHANGED_QOS;
2688
2689         if (elems.erp_info && elems.erp_info_len >= 1) {
2690                 erp_valid = true;
2691                 erp_value = elems.erp_info[0];
2692         } else {
2693                 erp_valid = false;
2694         }
2695         changed |= ieee80211_handle_bss_capability(sdata,
2696                         le16_to_cpu(mgmt->u.beacon.capab_info),
2697                         erp_valid, erp_value);
2698
2699
2700         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2701             !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2702                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2703                                                   bssid, true);
2704
2705         if (elems.country_elem && elems.pwr_constr_elem &&
2706             mgmt->u.probe_resp.capab_info &
2707                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
2708                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
2709                                                        elems.country_elem,
2710                                                        elems.country_elem_len,
2711                                                        elems.pwr_constr_elem);
2712
2713         ieee80211_bss_info_change_notify(sdata, changed);
2714 }
2715
2716 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2717                                   struct sk_buff *skb)
2718 {
2719         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2720         struct ieee80211_rx_status *rx_status;
2721         struct ieee80211_mgmt *mgmt;
2722         struct cfg80211_bss *bss = NULL;
2723         enum rx_mgmt_action rma = RX_MGMT_NONE;
2724         u16 fc;
2725
2726         rx_status = (struct ieee80211_rx_status *) skb->cb;
2727         mgmt = (struct ieee80211_mgmt *) skb->data;
2728         fc = le16_to_cpu(mgmt->frame_control);
2729
2730         mutex_lock(&ifmgd->mtx);
2731
2732         switch (fc & IEEE80211_FCTL_STYPE) {
2733         case IEEE80211_STYPE_BEACON:
2734                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2735                 break;
2736         case IEEE80211_STYPE_PROBE_RESP:
2737                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2738                 break;
2739         case IEEE80211_STYPE_AUTH:
2740                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2741                 break;
2742         case IEEE80211_STYPE_DEAUTH:
2743                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2744                 break;
2745         case IEEE80211_STYPE_DISASSOC:
2746                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2747                 break;
2748         case IEEE80211_STYPE_ASSOC_RESP:
2749         case IEEE80211_STYPE_REASSOC_RESP:
2750                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2751                 break;
2752         case IEEE80211_STYPE_ACTION:
2753                 switch (mgmt->u.action.category) {
2754                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2755                         ieee80211_sta_process_chanswitch(sdata,
2756                                         &mgmt->u.action.u.chan_switch.sw_elem,
2757                                         (void *)ifmgd->associated->priv,
2758                                         rx_status->mactime);
2759                         break;
2760                 }
2761         }
2762         mutex_unlock(&ifmgd->mtx);
2763
2764         switch (rma) {
2765         case RX_MGMT_NONE:
2766                 /* no action */
2767                 break;
2768         case RX_MGMT_CFG80211_DEAUTH:
2769                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2770                 break;
2771         case RX_MGMT_CFG80211_DISASSOC:
2772                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2773                 break;
2774         case RX_MGMT_CFG80211_RX_AUTH:
2775                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2776                 break;
2777         case RX_MGMT_CFG80211_RX_ASSOC:
2778                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2779                 break;
2780         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2781                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2782                 break;
2783         default:
2784                 WARN(1, "unexpected: %d", rma);
2785         }
2786 }
2787
2788 static void ieee80211_sta_timer(unsigned long data)
2789 {
2790         struct ieee80211_sub_if_data *sdata =
2791                 (struct ieee80211_sub_if_data *) data;
2792         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2793         struct ieee80211_local *local = sdata->local;
2794
2795         if (local->quiescing) {
2796                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2797                 return;
2798         }
2799
2800         ieee80211_queue_work(&local->hw, &sdata->work);
2801 }
2802
2803 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2804                                           u8 *bssid, u8 reason)
2805 {
2806         struct ieee80211_local *local = sdata->local;
2807         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2808         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2809
2810         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2811                                false, frame_buf);
2812         mutex_unlock(&ifmgd->mtx);
2813
2814         /*
2815          * must be outside lock due to cfg80211,
2816          * but that's not a problem.
2817          */
2818         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2819
2820         mutex_lock(&local->mtx);
2821         ieee80211_recalc_idle(local);
2822         mutex_unlock(&local->mtx);
2823
2824         mutex_lock(&ifmgd->mtx);
2825 }
2826
2827 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2828 {
2829         struct ieee80211_local *local = sdata->local;
2830         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2831         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2832
2833         lockdep_assert_held(&ifmgd->mtx);
2834
2835         if (WARN_ON_ONCE(!auth_data))
2836                 return -EINVAL;
2837
2838         auth_data->tries++;
2839
2840         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2841                 sdata_info(sdata, "authentication with %pM timed out\n",
2842                            auth_data->bss->bssid);
2843
2844                 /*
2845                  * Most likely AP is not in the range so remove the
2846                  * bss struct for that AP.
2847                  */
2848                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2849
2850                 return -ETIMEDOUT;
2851         }
2852
2853         drv_mgd_prepare_tx(local, sdata);
2854
2855         if (auth_data->bss->proberesp_ies) {
2856                 u16 trans = 1;
2857                 u16 status = 0;
2858
2859                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2860                            auth_data->bss->bssid, auth_data->tries,
2861                            IEEE80211_AUTH_MAX_TRIES);
2862
2863                 auth_data->expected_transaction = 2;
2864
2865                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
2866                         trans = auth_data->sae_trans;
2867                         status = auth_data->sae_status;
2868                         auth_data->expected_transaction = trans;
2869                 }
2870
2871                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
2872                                     auth_data->data, auth_data->data_len,
2873                                     auth_data->bss->bssid,
2874                                     auth_data->bss->bssid, NULL, 0, 0);
2875         } else {
2876                 const u8 *ssidie;
2877
2878                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2879                            auth_data->bss->bssid, auth_data->tries,
2880                            IEEE80211_AUTH_MAX_TRIES);
2881
2882                 rcu_read_lock();
2883                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2884                 if (!ssidie) {
2885                         rcu_read_unlock();
2886                         return -EINVAL;
2887                 }
2888                 /*
2889                  * Direct probe is sent to broadcast address as some APs
2890                  * will not answer to direct packet in unassociated state.
2891                  */
2892                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2893                                          NULL, 0, (u32) -1, true, false,
2894                                          auth_data->bss->channel, false);
2895                 rcu_read_unlock();
2896         }
2897
2898         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2899         run_again(ifmgd, auth_data->timeout);
2900
2901         return 0;
2902 }
2903
2904 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2905 {
2906         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2907         struct ieee80211_local *local = sdata->local;
2908
2909         lockdep_assert_held(&sdata->u.mgd.mtx);
2910
2911         assoc_data->tries++;
2912         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2913                 sdata_info(sdata, "association with %pM timed out\n",
2914                            assoc_data->bss->bssid);
2915
2916                 /*
2917                  * Most likely AP is not in the range so remove the
2918                  * bss struct for that AP.
2919                  */
2920                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2921
2922                 return -ETIMEDOUT;
2923         }
2924
2925         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2926                    assoc_data->bss->bssid, assoc_data->tries,
2927                    IEEE80211_ASSOC_MAX_TRIES);
2928         ieee80211_send_assoc(sdata);
2929
2930         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2931         run_again(&sdata->u.mgd, assoc_data->timeout);
2932
2933         return 0;
2934 }
2935
2936 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2937 {
2938         struct ieee80211_local *local = sdata->local;
2939         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2940
2941         mutex_lock(&ifmgd->mtx);
2942
2943         if (ifmgd->auth_data &&
2944             time_after(jiffies, ifmgd->auth_data->timeout)) {
2945                 if (ifmgd->auth_data->done) {
2946                         /*
2947                          * ok ... we waited for assoc but userspace didn't,
2948                          * so let's just kill the auth data
2949                          */
2950                         ieee80211_destroy_auth_data(sdata, false);
2951                 } else if (ieee80211_probe_auth(sdata)) {
2952                         u8 bssid[ETH_ALEN];
2953
2954                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2955
2956                         ieee80211_destroy_auth_data(sdata, false);
2957
2958                         mutex_unlock(&ifmgd->mtx);
2959                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2960                         mutex_lock(&ifmgd->mtx);
2961                 }
2962         } else if (ifmgd->auth_data)
2963                 run_again(ifmgd, ifmgd->auth_data->timeout);
2964
2965         if (ifmgd->assoc_data &&
2966             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2967                 if (!ifmgd->assoc_data->have_beacon ||
2968                     ieee80211_do_assoc(sdata)) {
2969                         u8 bssid[ETH_ALEN];
2970
2971                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2972
2973                         ieee80211_destroy_assoc_data(sdata, false);
2974
2975                         mutex_unlock(&ifmgd->mtx);
2976                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2977                         mutex_lock(&ifmgd->mtx);
2978                 }
2979         } else if (ifmgd->assoc_data)
2980                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2981
2982         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2983                             IEEE80211_STA_CONNECTION_POLL) &&
2984             ifmgd->associated) {
2985                 u8 bssid[ETH_ALEN];
2986                 int max_tries;
2987
2988                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2989
2990                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2991                         max_tries = max_nullfunc_tries;
2992                 else
2993                         max_tries = max_probe_tries;
2994
2995                 /* ACK received for nullfunc probing frame */
2996                 if (!ifmgd->probe_send_count)
2997                         ieee80211_reset_ap_probe(sdata);
2998                 else if (ifmgd->nullfunc_failed) {
2999                         if (ifmgd->probe_send_count < max_tries) {
3000                                 mlme_dbg(sdata,
3001                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
3002                                          bssid, ifmgd->probe_send_count,
3003                                          max_tries);
3004                                 ieee80211_mgd_probe_ap_send(sdata);
3005                         } else {
3006                                 mlme_dbg(sdata,
3007                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
3008                                          bssid);
3009                                 ieee80211_sta_connection_lost(sdata, bssid,
3010                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
3011                         }
3012                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3013                         run_again(ifmgd, ifmgd->probe_timeout);
3014                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3015                         mlme_dbg(sdata,
3016                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3017                                  bssid, probe_wait_ms);
3018                         ieee80211_sta_connection_lost(sdata, bssid,
3019                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
3020                 } else if (ifmgd->probe_send_count < max_tries) {
3021                         mlme_dbg(sdata,
3022                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3023                                  bssid, probe_wait_ms,
3024                                  ifmgd->probe_send_count, max_tries);
3025                         ieee80211_mgd_probe_ap_send(sdata);
3026                 } else {
3027                         /*
3028                          * We actually lost the connection ... or did we?
3029                          * Let's make sure!
3030                          */
3031                         wiphy_debug(local->hw.wiphy,
3032                                     "%s: No probe response from AP %pM"
3033                                     " after %dms, disconnecting.\n",
3034                                     sdata->name,
3035                                     bssid, probe_wait_ms);
3036
3037                         ieee80211_sta_connection_lost(sdata, bssid,
3038                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
3039                 }
3040         }
3041
3042         mutex_unlock(&ifmgd->mtx);
3043
3044         mutex_lock(&local->mtx);
3045         ieee80211_recalc_idle(local);
3046         mutex_unlock(&local->mtx);
3047 }
3048
3049 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3050 {
3051         struct ieee80211_sub_if_data *sdata =
3052                 (struct ieee80211_sub_if_data *) data;
3053         struct ieee80211_local *local = sdata->local;
3054
3055         if (local->quiescing)
3056                 return;
3057
3058         ieee80211_queue_work(&sdata->local->hw,
3059                              &sdata->u.mgd.beacon_connection_loss_work);
3060 }
3061
3062 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3063 {
3064         struct ieee80211_sub_if_data *sdata =
3065                 (struct ieee80211_sub_if_data *) data;
3066         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3067         struct ieee80211_local *local = sdata->local;
3068
3069         if (local->quiescing)
3070                 return;
3071
3072         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3073 }
3074
3075 static void ieee80211_sta_monitor_work(struct work_struct *work)
3076 {
3077         struct ieee80211_sub_if_data *sdata =
3078                 container_of(work, struct ieee80211_sub_if_data,
3079                              u.mgd.monitor_work);
3080
3081         ieee80211_mgd_probe_ap(sdata, false);
3082 }
3083
3084 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3085 {
3086         u32 flags;
3087
3088         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3089                 __ieee80211_stop_poll(sdata);
3090
3091                 /* let's probe the connection once */
3092                 flags = sdata->local->hw.flags;
3093                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3094                         ieee80211_queue_work(&sdata->local->hw,
3095                                              &sdata->u.mgd.monitor_work);
3096                 /* and do all the other regular work too */
3097                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3098         }
3099 }
3100
3101 #ifdef CONFIG_PM
3102 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
3103 {
3104         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3105
3106         /*
3107          * we need to use atomic bitops for the running bits
3108          * only because both timers might fire at the same
3109          * time -- the code here is properly synchronised.
3110          */
3111
3112         cancel_work_sync(&ifmgd->request_smps_work);
3113
3114         cancel_work_sync(&ifmgd->monitor_work);
3115         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
3116         cancel_work_sync(&ifmgd->csa_connection_drop_work);
3117         if (del_timer_sync(&ifmgd->timer))
3118                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
3119
3120         cancel_work_sync(&ifmgd->chswitch_work);
3121         if (del_timer_sync(&ifmgd->chswitch_timer))
3122                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
3123
3124         /* these will just be re-established on connection */
3125         del_timer_sync(&ifmgd->conn_mon_timer);
3126         del_timer_sync(&ifmgd->bcn_mon_timer);
3127 }
3128
3129 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3130 {
3131         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3132
3133         if (!ifmgd->associated)
3134                 return;
3135
3136         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3137                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3138                 mutex_lock(&ifmgd->mtx);
3139                 if (ifmgd->associated) {
3140                         mlme_dbg(sdata,
3141                                  "driver requested disconnect after resume\n");
3142                         ieee80211_sta_connection_lost(sdata,
3143                                 ifmgd->associated->bssid,
3144                                 WLAN_REASON_UNSPECIFIED);
3145                         mutex_unlock(&ifmgd->mtx);
3146                         return;
3147                 }
3148                 mutex_unlock(&ifmgd->mtx);
3149         }
3150
3151         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
3152                 add_timer(&ifmgd->timer);
3153         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
3154                 add_timer(&ifmgd->chswitch_timer);
3155         ieee80211_sta_reset_beacon_monitor(sdata);
3156
3157         mutex_lock(&sdata->local->mtx);
3158         ieee80211_restart_sta_timer(sdata);
3159         mutex_unlock(&sdata->local->mtx);
3160 }
3161 #endif
3162
3163 /* interface setup */
3164 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3165 {
3166         struct ieee80211_if_managed *ifmgd;
3167
3168         ifmgd = &sdata->u.mgd;
3169         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3170         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3171         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3172                   ieee80211_beacon_connection_loss_work);
3173         INIT_WORK(&ifmgd->csa_connection_drop_work,
3174                   ieee80211_csa_connection_drop_work);
3175         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3176         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3177                     (unsigned long) sdata);
3178         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3179                     (unsigned long) sdata);
3180         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3181                     (unsigned long) sdata);
3182         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3183                     (unsigned long) sdata);
3184
3185         ifmgd->flags = 0;
3186         ifmgd->powersave = sdata->wdev.ps;
3187         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3188         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3189
3190         mutex_init(&ifmgd->mtx);
3191
3192         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3193                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3194         else
3195                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3196 }
3197
3198 /* scan finished notification */
3199 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3200 {
3201         struct ieee80211_sub_if_data *sdata;
3202
3203         /* Restart STA timers */
3204         rcu_read_lock();
3205         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3206                 ieee80211_restart_sta_timer(sdata);
3207         rcu_read_unlock();
3208 }
3209
3210 int ieee80211_max_network_latency(struct notifier_block *nb,
3211                                   unsigned long data, void *dummy)
3212 {
3213         s32 latency_usec = (s32) data;
3214         struct ieee80211_local *local =
3215                 container_of(nb, struct ieee80211_local,
3216                              network_latency_notifier);
3217
3218         mutex_lock(&local->iflist_mtx);
3219         ieee80211_recalc_ps(local, latency_usec);
3220         mutex_unlock(&local->iflist_mtx);
3221
3222         return 0;
3223 }
3224
3225 static u32 chandef_downgrade(struct cfg80211_chan_def *c)
3226 {
3227         u32 ret;
3228         int tmp;
3229
3230         switch (c->width) {
3231         case NL80211_CHAN_WIDTH_20:
3232                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
3233                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3234                 break;
3235         case NL80211_CHAN_WIDTH_40:
3236                 c->width = NL80211_CHAN_WIDTH_20;
3237                 c->center_freq1 = c->chan->center_freq;
3238                 ret = IEEE80211_STA_DISABLE_40MHZ |
3239                       IEEE80211_STA_DISABLE_VHT;
3240                 break;
3241         case NL80211_CHAN_WIDTH_80:
3242                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
3243                 /* n_P40 */
3244                 tmp /= 2;
3245                 /* freq_P40 */
3246                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
3247                 c->width = NL80211_CHAN_WIDTH_40;
3248                 ret = IEEE80211_STA_DISABLE_VHT;
3249                 break;
3250         case NL80211_CHAN_WIDTH_80P80:
3251                 c->center_freq2 = 0;
3252                 c->width = NL80211_CHAN_WIDTH_80;
3253                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
3254                       IEEE80211_STA_DISABLE_160MHZ;
3255                 break;
3256         case NL80211_CHAN_WIDTH_160:
3257                 /* n_P20 */
3258                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
3259                 /* n_P80 */
3260                 tmp /= 4;
3261                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
3262                 c->width = NL80211_CHAN_WIDTH_80;
3263                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
3264                       IEEE80211_STA_DISABLE_160MHZ;
3265                 break;
3266         default:
3267         case NL80211_CHAN_WIDTH_20_NOHT:
3268                 WARN_ON_ONCE(1);
3269                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
3270                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3271                 break;
3272         }
3273
3274         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
3275
3276         return ret;
3277 }
3278
3279 static u32
3280 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
3281                              struct ieee80211_supported_band *sband,
3282                              struct ieee80211_channel *channel,
3283                              const struct ieee80211_ht_operation *ht_oper,
3284                              const struct ieee80211_vht_operation *vht_oper,
3285                              struct cfg80211_chan_def *chandef)
3286 {
3287         struct cfg80211_chan_def vht_chandef;
3288         u32 ht_cfreq, ret;
3289
3290         chandef->chan = channel;
3291         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
3292         chandef->center_freq1 = channel->center_freq;
3293         chandef->center_freq2 = 0;
3294
3295         if (!ht_oper || !sband->ht_cap.ht_supported) {
3296                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3297                 goto out;
3298         }
3299
3300         chandef->width = NL80211_CHAN_WIDTH_20;
3301
3302         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3303                                                   channel->band);
3304         /* check that channel matches the right operating channel */
3305         if (channel->center_freq != ht_cfreq) {
3306                 /*
3307                  * It's possible that some APs are confused here;
3308                  * Netgear WNDR3700 sometimes reports 4 higher than
3309                  * the actual channel in association responses, but
3310                  * since we look at probe response/beacon data here
3311                  * it should be OK.
3312                  */
3313                 sdata_info(sdata,
3314                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3315                            channel->center_freq, ht_cfreq,
3316                            ht_oper->primary_chan, channel->band);
3317                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3318                 goto out;
3319         }
3320
3321         /* check 40 MHz support, if we have it */
3322         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3323                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3324                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3325                         chandef->width = NL80211_CHAN_WIDTH_40;
3326                         chandef->center_freq1 += 10;
3327                         break;
3328                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3329                         chandef->width = NL80211_CHAN_WIDTH_40;
3330                         chandef->center_freq1 -= 10;
3331                         break;
3332                 }
3333         } else {
3334                 /* 40 MHz (and 80 MHz) must be supported for VHT */
3335                 ret = IEEE80211_STA_DISABLE_VHT;
3336                 goto out;
3337         }
3338
3339         if (!vht_oper || !sband->vht_cap.vht_supported) {
3340                 ret = IEEE80211_STA_DISABLE_VHT;
3341                 goto out;
3342         }
3343
3344         vht_chandef.chan = channel;
3345         vht_chandef.center_freq1 =
3346                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
3347                                                channel->band);
3348         vht_chandef.center_freq2 = 0;
3349
3350         if (vht_oper->center_freq_seg2_idx)
3351                 vht_chandef.center_freq2 =
3352                         ieee80211_channel_to_frequency(
3353                                 vht_oper->center_freq_seg2_idx,
3354                                 channel->band);
3355
3356         switch (vht_oper->chan_width) {
3357         case IEEE80211_VHT_CHANWIDTH_USE_HT:
3358                 vht_chandef.width = chandef->width;
3359                 break;
3360         case IEEE80211_VHT_CHANWIDTH_80MHZ:
3361                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
3362                 break;
3363         case IEEE80211_VHT_CHANWIDTH_160MHZ:
3364                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
3365                 break;
3366         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
3367                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
3368                 break;
3369         default:
3370                 sdata_info(sdata,
3371                            "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
3372                            vht_oper->chan_width);
3373                 ret = IEEE80211_STA_DISABLE_VHT;
3374                 goto out;
3375         }
3376
3377         if (!cfg80211_chandef_valid(&vht_chandef)) {
3378                 sdata_info(sdata,
3379                            "AP VHT information is invalid, disable VHT\n");
3380                 ret = IEEE80211_STA_DISABLE_VHT;
3381                 goto out;
3382         }
3383
3384         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
3385                 ret = 0;
3386                 goto out;
3387         }
3388
3389         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
3390                 sdata_info(sdata,
3391                            "AP VHT information doesn't match HT, disable VHT\n");
3392                 ret = IEEE80211_STA_DISABLE_VHT;
3393                 goto out;
3394         }
3395
3396         *chandef = vht_chandef;
3397
3398         ret = 0;
3399
3400         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
3401                                         IEEE80211_CHAN_DISABLED)) {
3402                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
3403                         ret = IEEE80211_STA_DISABLE_HT |
3404                               IEEE80211_STA_DISABLE_VHT;
3405                         goto out;
3406                 }
3407
3408                 ret = chandef_downgrade(chandef);
3409         }
3410
3411         if (chandef->width != vht_chandef.width)
3412                 sdata_info(sdata,
3413                            "local regulatory prevented using AP HT/VHT configuration, downgraded\n");
3414
3415 out:
3416         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
3417         return ret;
3418 }
3419
3420 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3421                                      struct cfg80211_bss *cbss)
3422 {
3423         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3424         const u8 *ht_cap_ie, *vht_cap_ie;
3425         const struct ieee80211_ht_cap *ht_cap;
3426         const struct ieee80211_vht_cap *vht_cap;
3427         u8 chains = 1;
3428
3429         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3430                 return chains;
3431
3432         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3433         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3434                 ht_cap = (void *)(ht_cap_ie + 2);
3435                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3436                 /*
3437                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3438                  *       "Tx Unequal Modulation Supported" fields.
3439                  */
3440         }
3441
3442         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3443                 return chains;
3444
3445         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3446         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3447                 u8 nss;
3448                 u16 tx_mcs_map;
3449
3450                 vht_cap = (void *)(vht_cap_ie + 2);
3451                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3452                 for (nss = 8; nss > 0; nss--) {
3453                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3454                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3455                                 break;
3456                 }
3457                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3458                 chains = max(chains, nss);
3459         }
3460
3461         return chains;
3462 }
3463
3464 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3465                                   struct cfg80211_bss *cbss)
3466 {
3467         struct ieee80211_local *local = sdata->local;
3468         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3469         const struct ieee80211_ht_operation *ht_oper = NULL;
3470         const struct ieee80211_vht_operation *vht_oper = NULL;
3471         struct ieee80211_supported_band *sband;
3472         struct cfg80211_chan_def chandef;
3473         int ret;
3474
3475         sband = local->hw.wiphy->bands[cbss->channel->band];
3476
3477         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3478                           IEEE80211_STA_DISABLE_80P80MHZ |
3479                           IEEE80211_STA_DISABLE_160MHZ);
3480
3481         rcu_read_lock();
3482
3483         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3484             sband->ht_cap.ht_supported) {
3485                 const u8 *ht_oper_ie;
3486
3487                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3488                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3489                         ht_oper = (void *)(ht_oper_ie + 2);
3490         }
3491
3492         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3493             sband->vht_cap.vht_supported) {
3494                 const u8 *vht_oper_ie;
3495
3496                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3497                                                    WLAN_EID_VHT_OPERATION);
3498                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3499                         vht_oper = (void *)(vht_oper_ie + 2);
3500                 if (vht_oper && !ht_oper) {
3501                         vht_oper = NULL;
3502                         sdata_info(sdata,
3503                                    "AP advertised VHT without HT, disabling both\n");
3504                         sdata->flags |= IEEE80211_STA_DISABLE_HT;
3505                         sdata->flags |= IEEE80211_STA_DISABLE_VHT;
3506                 }
3507         }
3508
3509         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3510                                                      cbss->channel,
3511                                                      ht_oper, vht_oper,
3512                                                      &chandef);
3513
3514         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3515                                       local->rx_chains);
3516
3517         rcu_read_unlock();
3518
3519         /* will change later if needed */
3520         sdata->smps_mode = IEEE80211_SMPS_OFF;
3521
3522         /*
3523          * If this fails (possibly due to channel context sharing
3524          * on incompatible channels, e.g. 80+80 and 160 sharing the
3525          * same control channel) try to use a smaller bandwidth.
3526          */
3527         ret = ieee80211_vif_use_channel(sdata, &chandef,
3528                                         IEEE80211_CHANCTX_SHARED);
3529         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT)
3530                 ifmgd->flags |= chandef_downgrade(&chandef);
3531         return ret;
3532 }
3533
3534 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3535                                      struct cfg80211_bss *cbss, bool assoc)
3536 {
3537         struct ieee80211_local *local = sdata->local;
3538         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3539         struct ieee80211_bss *bss = (void *)cbss->priv;
3540         struct sta_info *new_sta = NULL;
3541         bool have_sta = false;
3542         int err;
3543
3544         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3545                 return -EINVAL;
3546
3547         if (assoc) {
3548                 rcu_read_lock();
3549                 have_sta = sta_info_get(sdata, cbss->bssid);
3550                 rcu_read_unlock();
3551         }
3552
3553         if (!have_sta) {
3554                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3555                 if (!new_sta)
3556                         return -ENOMEM;
3557         }
3558
3559         mutex_lock(&local->mtx);
3560         ieee80211_recalc_idle(sdata->local);
3561         mutex_unlock(&local->mtx);
3562
3563         if (new_sta) {
3564                 u32 rates = 0, basic_rates = 0;
3565                 bool have_higher_than_11mbit;
3566                 int min_rate = INT_MAX, min_rate_index = -1;
3567                 struct ieee80211_supported_band *sband;
3568
3569                 sband = local->hw.wiphy->bands[cbss->channel->band];
3570
3571                 err = ieee80211_prep_channel(sdata, cbss);
3572                 if (err) {
3573                         sta_info_free(local, new_sta);
3574                         return err;
3575                 }
3576
3577                 ieee80211_get_rates(sband, bss->supp_rates,
3578                                     bss->supp_rates_len,
3579                                     &rates, &basic_rates,
3580                                     &have_higher_than_11mbit,
3581                                     &min_rate, &min_rate_index);
3582
3583                 /*
3584                  * This used to be a workaround for basic rates missing
3585                  * in the association response frame. Now that we no
3586                  * longer use the basic rates from there, it probably
3587                  * doesn't happen any more, but keep the workaround so
3588                  * in case some *other* APs are buggy in different ways
3589                  * we can connect -- with a warning.
3590                  */
3591                 if (!basic_rates && min_rate_index >= 0) {
3592                         sdata_info(sdata,
3593                                    "No basic rates, using min rate instead\n");
3594                         basic_rates = BIT(min_rate_index);
3595                 }
3596
3597                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3598                 sdata->vif.bss_conf.basic_rates = basic_rates;
3599
3600                 /* cf. IEEE 802.11 9.2.12 */
3601                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3602                     have_higher_than_11mbit)
3603                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3604                 else
3605                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3606
3607                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3608
3609                 /* set timing information */
3610                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3611                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3612                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3613
3614                 /* tell driver about BSSID, basic rates and timing */
3615                 ieee80211_bss_info_change_notify(sdata,
3616                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3617                         BSS_CHANGED_BEACON_INT);
3618
3619                 if (assoc)
3620                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3621
3622                 err = sta_info_insert(new_sta);
3623                 new_sta = NULL;
3624                 if (err) {
3625                         sdata_info(sdata,
3626                                    "failed to insert STA entry for the AP (error %d)\n",
3627                                    err);
3628                         return err;
3629                 }
3630         } else
3631                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3632
3633         return 0;
3634 }
3635
3636 /* config hooks */
3637 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3638                        struct cfg80211_auth_request *req)
3639 {
3640         struct ieee80211_local *local = sdata->local;
3641         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3642         struct ieee80211_mgd_auth_data *auth_data;
3643         u16 auth_alg;
3644         int err;
3645
3646         /* prepare auth data structure */
3647
3648         switch (req->auth_type) {
3649         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3650                 auth_alg = WLAN_AUTH_OPEN;
3651                 break;
3652         case NL80211_AUTHTYPE_SHARED_KEY:
3653                 if (IS_ERR(local->wep_tx_tfm))
3654                         return -EOPNOTSUPP;
3655                 auth_alg = WLAN_AUTH_SHARED_KEY;
3656                 break;
3657         case NL80211_AUTHTYPE_FT:
3658                 auth_alg = WLAN_AUTH_FT;
3659                 break;
3660         case NL80211_AUTHTYPE_NETWORK_EAP:
3661                 auth_alg = WLAN_AUTH_LEAP;
3662                 break;
3663         case NL80211_AUTHTYPE_SAE:
3664                 auth_alg = WLAN_AUTH_SAE;
3665                 break;
3666         default:
3667                 return -EOPNOTSUPP;
3668         }
3669
3670         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3671                             req->ie_len, GFP_KERNEL);
3672         if (!auth_data)
3673                 return -ENOMEM;
3674
3675         auth_data->bss = req->bss;
3676
3677         if (req->sae_data_len >= 4) {
3678                 __le16 *pos = (__le16 *) req->sae_data;
3679                 auth_data->sae_trans = le16_to_cpu(pos[0]);
3680                 auth_data->sae_status = le16_to_cpu(pos[1]);
3681                 memcpy(auth_data->data, req->sae_data + 4,
3682                        req->sae_data_len - 4);
3683                 auth_data->data_len += req->sae_data_len - 4;
3684         }
3685
3686         if (req->ie && req->ie_len) {
3687                 memcpy(&auth_data->data[auth_data->data_len],
3688                        req->ie, req->ie_len);
3689                 auth_data->data_len += req->ie_len;
3690         }
3691
3692         if (req->key && req->key_len) {
3693                 auth_data->key_len = req->key_len;
3694                 auth_data->key_idx = req->key_idx;
3695                 memcpy(auth_data->key, req->key, req->key_len);
3696         }
3697
3698         auth_data->algorithm = auth_alg;
3699
3700         /* try to authenticate/probe */
3701
3702         mutex_lock(&ifmgd->mtx);
3703
3704         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3705             ifmgd->assoc_data) {
3706                 err = -EBUSY;
3707                 goto err_free;
3708         }
3709
3710         if (ifmgd->auth_data)
3711                 ieee80211_destroy_auth_data(sdata, false);
3712
3713         /* prep auth_data so we don't go into idle on disassoc */
3714         ifmgd->auth_data = auth_data;
3715
3716         if (ifmgd->associated)
3717                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3718
3719         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3720
3721         err = ieee80211_prep_connection(sdata, req->bss, false);
3722         if (err)
3723                 goto err_clear;
3724
3725         err = ieee80211_probe_auth(sdata);
3726         if (err) {
3727                 sta_info_destroy_addr(sdata, req->bss->bssid);
3728                 goto err_clear;
3729         }
3730
3731         /* hold our own reference */
3732         cfg80211_ref_bss(auth_data->bss);
3733         err = 0;
3734         goto out_unlock;
3735
3736  err_clear:
3737         memset(ifmgd->bssid, 0, ETH_ALEN);
3738         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3739         ifmgd->auth_data = NULL;
3740  err_free:
3741         kfree(auth_data);
3742  out_unlock:
3743         mutex_unlock(&ifmgd->mtx);
3744
3745         return err;
3746 }
3747
3748 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3749                         struct cfg80211_assoc_request *req)
3750 {
3751         struct ieee80211_local *local = sdata->local;
3752         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3753         struct ieee80211_bss *bss = (void *)req->bss->priv;
3754         struct ieee80211_mgd_assoc_data *assoc_data;
3755         struct ieee80211_supported_band *sband;
3756         const u8 *ssidie, *ht_ie;
3757         int i, err;
3758
3759         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3760         if (!assoc_data)
3761                 return -ENOMEM;
3762
3763         rcu_read_lock();
3764         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3765         if (!ssidie) {
3766                 rcu_read_unlock();
3767                 kfree(assoc_data);
3768                 return -EINVAL;
3769         }
3770         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3771         assoc_data->ssid_len = ssidie[1];
3772         rcu_read_unlock();
3773
3774         mutex_lock(&ifmgd->mtx);
3775
3776         if (ifmgd->associated)
3777                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3778
3779         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3780                 err = -EBUSY;
3781                 goto err_free;
3782         }
3783
3784         if (ifmgd->assoc_data) {
3785                 err = -EBUSY;
3786                 goto err_free;
3787         }
3788
3789         if (ifmgd->auth_data) {
3790                 bool match;
3791
3792                 /* keep sta info, bssid if matching */
3793                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3794                 ieee80211_destroy_auth_data(sdata, match);
3795         }
3796
3797         /* prepare assoc data */
3798
3799         ifmgd->beacon_crc_valid = false;
3800
3801         /*
3802          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3803          * We still associate in non-HT mode (11a/b/g) if any one of these
3804          * ciphers is configured as pairwise.
3805          * We can set this to true for non-11n hardware, that'll be checked
3806          * separately along with the peer capabilities.
3807          */
3808         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3809                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3810                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3811                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3812                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3813                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3814                         netdev_info(sdata->dev,
3815                                     "disabling HT/VHT due to WEP/TKIP use\n");
3816                 }
3817         }
3818
3819         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3820                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3821                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3822         }
3823
3824         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3825         sband = local->hw.wiphy->bands[req->bss->channel->band];
3826         if (!sband->ht_cap.ht_supported ||
3827             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3828                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3829                 if (!bss->wmm_used)
3830                         netdev_info(sdata->dev,
3831                                     "disabling HT as WMM/QoS is not supported by the AP\n");
3832         }
3833
3834         /* disable VHT if we don't support it or the AP doesn't use WMM */
3835         if (!sband->vht_cap.vht_supported ||
3836             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3837                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3838                 if (!bss->wmm_used)
3839                         netdev_info(sdata->dev,
3840                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
3841         }
3842
3843         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3844         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3845                sizeof(ifmgd->ht_capa_mask));
3846
3847         if (req->ie && req->ie_len) {
3848                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3849                 assoc_data->ie_len = req->ie_len;
3850         }
3851
3852         assoc_data->bss = req->bss;
3853
3854         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3855                 if (ifmgd->powersave)
3856                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
3857                 else
3858                         sdata->smps_mode = IEEE80211_SMPS_OFF;
3859         } else
3860                 sdata->smps_mode = ifmgd->req_smps;
3861
3862         assoc_data->capability = req->bss->capability;
3863         assoc_data->wmm = bss->wmm_used &&
3864                           (local->hw.queues >= IEEE80211_NUM_ACS);
3865         assoc_data->supp_rates = bss->supp_rates;
3866         assoc_data->supp_rates_len = bss->supp_rates_len;
3867
3868         rcu_read_lock();
3869         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3870         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3871                 assoc_data->ap_ht_param =
3872                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3873         else
3874                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3875         rcu_read_unlock();
3876
3877         if (bss->wmm_used && bss->uapsd_supported &&
3878             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3879                 assoc_data->uapsd = true;
3880                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3881         } else {
3882                 assoc_data->uapsd = false;
3883                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3884         }
3885
3886         if (req->prev_bssid)
3887                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3888
3889         if (req->use_mfp) {
3890                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3891                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3892         } else {
3893                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3894                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3895         }
3896
3897         if (req->crypto.control_port)
3898                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3899         else
3900                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3901
3902         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3903         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3904
3905         /* kick off associate process */
3906
3907         ifmgd->assoc_data = assoc_data;
3908         ifmgd->dtim_period = 0;
3909
3910         err = ieee80211_prep_connection(sdata, req->bss, true);
3911         if (err)
3912                 goto err_clear;
3913
3914         if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3915                 const struct cfg80211_bss_ies *beacon_ies;
3916
3917                 rcu_read_lock();
3918                 beacon_ies = rcu_dereference(req->bss->beacon_ies);
3919                 if (!beacon_ies) {
3920                         /*
3921                          * Wait up to one beacon interval ...
3922                          * should this be more if we miss one?
3923                          */
3924                         sdata_info(sdata, "waiting for beacon from %pM\n",
3925                                    ifmgd->bssid);
3926                         assoc_data->timeout =
3927                                 TU_TO_EXP_TIME(req->bss->beacon_interval);
3928                 } else {
3929                         const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
3930                                                             beacon_ies->data,
3931                                                             beacon_ies->len);
3932                         if (tim_ie && tim_ie[1] >=
3933                                         sizeof(struct ieee80211_tim_ie)) {
3934                                 const struct ieee80211_tim_ie *tim;
3935                                 tim = (void *)(tim_ie + 2);
3936                                 ifmgd->dtim_period = tim->dtim_period;
3937                         }
3938                         assoc_data->have_beacon = true;
3939                         assoc_data->sent_assoc = false;
3940                         assoc_data->timeout = jiffies;
3941                 }
3942                 rcu_read_unlock();
3943         } else {
3944                 assoc_data->have_beacon = true;
3945                 assoc_data->sent_assoc = false;
3946                 assoc_data->timeout = jiffies;
3947         }
3948         run_again(ifmgd, assoc_data->timeout);
3949
3950         if (bss->corrupt_data) {
3951                 char *corrupt_type = "data";
3952                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3953                         if (bss->corrupt_data &
3954                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3955                                 corrupt_type = "beacon and probe response";
3956                         else
3957                                 corrupt_type = "beacon";
3958                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3959                         corrupt_type = "probe response";
3960                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3961                            corrupt_type);
3962         }
3963
3964         err = 0;
3965         goto out;
3966  err_clear:
3967         memset(ifmgd->bssid, 0, ETH_ALEN);
3968         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3969         ifmgd->assoc_data = NULL;
3970  err_free:
3971         kfree(assoc_data);
3972  out:
3973         mutex_unlock(&ifmgd->mtx);
3974
3975         return err;
3976 }
3977
3978 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3979                          struct cfg80211_deauth_request *req)
3980 {
3981         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3982         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3983         bool tx = !req->local_state_change;
3984         bool sent_frame = false;
3985
3986         mutex_lock(&ifmgd->mtx);
3987
3988         sdata_info(sdata,
3989                    "deauthenticating from %pM by local choice (reason=%d)\n",
3990                    req->bssid, req->reason_code);
3991
3992         if (ifmgd->auth_data) {
3993                 drv_mgd_prepare_tx(sdata->local, sdata);
3994                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3995                                                IEEE80211_STYPE_DEAUTH,
3996                                                req->reason_code, tx,
3997                                                frame_buf);
3998                 ieee80211_destroy_auth_data(sdata, false);
3999                 mutex_unlock(&ifmgd->mtx);
4000
4001                 sent_frame = tx;
4002                 goto out;
4003         }
4004
4005         if (ifmgd->associated &&
4006             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4007                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
4008                                        req->reason_code, tx, frame_buf);
4009                 sent_frame = tx;
4010         }
4011         mutex_unlock(&ifmgd->mtx);
4012
4013  out:
4014         mutex_lock(&sdata->local->mtx);
4015         ieee80211_recalc_idle(sdata->local);
4016         mutex_unlock(&sdata->local->mtx);
4017
4018         if (sent_frame)
4019                 __cfg80211_send_deauth(sdata->dev, frame_buf,
4020                                        IEEE80211_DEAUTH_FRAME_LEN);
4021
4022         return 0;
4023 }
4024
4025 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4026                            struct cfg80211_disassoc_request *req)
4027 {
4028         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4029         u8 bssid[ETH_ALEN];
4030         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4031
4032         mutex_lock(&ifmgd->mtx);
4033
4034         /*
4035          * cfg80211 should catch this ... but it's racy since
4036          * we can receive a disassoc frame, process it, hand it
4037          * to cfg80211 while that's in a locked section already
4038          * trying to tell us that the user wants to disconnect.
4039          */
4040         if (ifmgd->associated != req->bss) {
4041                 mutex_unlock(&ifmgd->mtx);
4042                 return -ENOLINK;
4043         }
4044
4045         sdata_info(sdata,
4046                    "disassociating from %pM by local choice (reason=%d)\n",
4047                    req->bss->bssid, req->reason_code);
4048
4049         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4050         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4051                                req->reason_code, !req->local_state_change,
4052                                frame_buf);
4053         mutex_unlock(&ifmgd->mtx);
4054
4055         __cfg80211_send_disassoc(sdata->dev, frame_buf,
4056                                  IEEE80211_DEAUTH_FRAME_LEN);
4057
4058         mutex_lock(&sdata->local->mtx);
4059         ieee80211_recalc_idle(sdata->local);
4060         mutex_unlock(&sdata->local->mtx);
4061
4062         return 0;
4063 }
4064
4065 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4066 {
4067         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4068
4069         mutex_lock(&ifmgd->mtx);
4070         if (ifmgd->assoc_data)
4071                 ieee80211_destroy_assoc_data(sdata, false);
4072         if (ifmgd->auth_data)
4073                 ieee80211_destroy_auth_data(sdata, false);
4074         del_timer_sync(&ifmgd->timer);
4075         mutex_unlock(&ifmgd->mtx);
4076 }
4077
4078 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4079                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4080                                gfp_t gfp)
4081 {
4082         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4083
4084         trace_api_cqm_rssi_notify(sdata, rssi_event);
4085
4086         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4087 }
4088 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);