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                         struct ieee80211_bss *bss;
1078                         int maxslp = 1;
1079                         u8 dtimper;
1080
1081                         bss = (void *)found->u.mgd.associated->priv;
1082                         dtimper = bss->dtim_period;
1083
1084                         /* If the TIM IE is invalid, pretend the value is 1 */
1085                         if (!dtimper)
1086                                 dtimper = 1;
1087                         else if (dtimper > 1)
1088                                 maxslp = min_t(int, dtimper,
1089                                                     latency / beaconint_us);
1090
1091                         local->hw.conf.max_sleep_period = maxslp;
1092                         local->hw.conf.ps_dtim_period = dtimper;
1093                         local->ps_sdata = found;
1094                 }
1095         } else {
1096                 local->ps_sdata = NULL;
1097         }
1098
1099         ieee80211_change_ps(local);
1100 }
1101
1102 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1103 {
1104         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1105
1106         if (sdata->vif.bss_conf.ps != ps_allowed) {
1107                 sdata->vif.bss_conf.ps = ps_allowed;
1108                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1109         }
1110 }
1111
1112 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1113 {
1114         struct ieee80211_local *local =
1115                 container_of(work, struct ieee80211_local,
1116                              dynamic_ps_disable_work);
1117
1118         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1119                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1120                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1121         }
1122
1123         ieee80211_wake_queues_by_reason(&local->hw,
1124                                         IEEE80211_QUEUE_STOP_REASON_PS);
1125 }
1126
1127 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1128 {
1129         struct ieee80211_local *local =
1130                 container_of(work, struct ieee80211_local,
1131                              dynamic_ps_enable_work);
1132         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1133         struct ieee80211_if_managed *ifmgd;
1134         unsigned long flags;
1135         int q;
1136
1137         /* can only happen when PS was just disabled anyway */
1138         if (!sdata)
1139                 return;
1140
1141         ifmgd = &sdata->u.mgd;
1142
1143         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1144                 return;
1145
1146         if (!local->disable_dynamic_ps &&
1147             local->hw.conf.dynamic_ps_timeout > 0) {
1148                 /* don't enter PS if TX frames are pending */
1149                 if (drv_tx_frames_pending(local)) {
1150                         mod_timer(&local->dynamic_ps_timer, jiffies +
1151                                   msecs_to_jiffies(
1152                                   local->hw.conf.dynamic_ps_timeout));
1153                         return;
1154                 }
1155
1156                 /*
1157                  * transmission can be stopped by others which leads to
1158                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1159                  * is not the actual idle state.
1160                  */
1161                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1162                 for (q = 0; q < local->hw.queues; q++) {
1163                         if (local->queue_stop_reasons[q]) {
1164                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1165                                                        flags);
1166                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1167                                           msecs_to_jiffies(
1168                                           local->hw.conf.dynamic_ps_timeout));
1169                                 return;
1170                         }
1171                 }
1172                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1173         }
1174
1175         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1176             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1177                 netif_tx_stop_all_queues(sdata->dev);
1178
1179                 if (drv_tx_frames_pending(local))
1180                         mod_timer(&local->dynamic_ps_timer, jiffies +
1181                                   msecs_to_jiffies(
1182                                   local->hw.conf.dynamic_ps_timeout));
1183                 else {
1184                         ieee80211_send_nullfunc(local, sdata, 1);
1185                         /* Flush to get the tx status of nullfunc frame */
1186                         drv_flush(local, false);
1187                 }
1188         }
1189
1190         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1191               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1192             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1193                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1194                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1195                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1196         }
1197
1198         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1199                 netif_tx_wake_all_queues(sdata->dev);
1200 }
1201
1202 void ieee80211_dynamic_ps_timer(unsigned long data)
1203 {
1204         struct ieee80211_local *local = (void *) data;
1205
1206         if (local->quiescing || local->suspended)
1207                 return;
1208
1209         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1210 }
1211
1212 /* MLME */
1213 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1214                                      struct ieee80211_sub_if_data *sdata,
1215                                      u8 *wmm_param, size_t wmm_param_len)
1216 {
1217         struct ieee80211_tx_queue_params params;
1218         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1219         size_t left;
1220         int count;
1221         u8 *pos, uapsd_queues = 0;
1222
1223         if (!local->ops->conf_tx)
1224                 return false;
1225
1226         if (local->hw.queues < IEEE80211_NUM_ACS)
1227                 return false;
1228
1229         if (!wmm_param)
1230                 return false;
1231
1232         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1233                 return false;
1234
1235         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1236                 uapsd_queues = ifmgd->uapsd_queues;
1237
1238         count = wmm_param[6] & 0x0f;
1239         if (count == ifmgd->wmm_last_param_set)
1240                 return false;
1241         ifmgd->wmm_last_param_set = count;
1242
1243         pos = wmm_param + 8;
1244         left = wmm_param_len - 8;
1245
1246         memset(&params, 0, sizeof(params));
1247
1248         sdata->wmm_acm = 0;
1249         for (; left >= 4; left -= 4, pos += 4) {
1250                 int aci = (pos[0] >> 5) & 0x03;
1251                 int acm = (pos[0] >> 4) & 0x01;
1252                 bool uapsd = false;
1253                 int queue;
1254
1255                 switch (aci) {
1256                 case 1: /* AC_BK */
1257                         queue = 3;
1258                         if (acm)
1259                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1260                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1261                                 uapsd = true;
1262                         break;
1263                 case 2: /* AC_VI */
1264                         queue = 1;
1265                         if (acm)
1266                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1267                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1268                                 uapsd = true;
1269                         break;
1270                 case 3: /* AC_VO */
1271                         queue = 0;
1272                         if (acm)
1273                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1274                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1275                                 uapsd = true;
1276                         break;
1277                 case 0: /* AC_BE */
1278                 default:
1279                         queue = 2;
1280                         if (acm)
1281                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1282                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1283                                 uapsd = true;
1284                         break;
1285                 }
1286
1287                 params.aifs = pos[0] & 0x0f;
1288                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1289                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1290                 params.txop = get_unaligned_le16(pos + 2);
1291                 params.uapsd = uapsd;
1292
1293                 mlme_dbg(sdata,
1294                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1295                          queue, aci, acm,
1296                          params.aifs, params.cw_min, params.cw_max,
1297                          params.txop, params.uapsd);
1298                 sdata->tx_conf[queue] = params;
1299                 if (drv_conf_tx(local, sdata, queue, &params))
1300                         sdata_err(sdata,
1301                                   "failed to set TX queue parameters for queue %d\n",
1302                                   queue);
1303         }
1304
1305         /* enable WMM or activate new settings */
1306         sdata->vif.bss_conf.qos = true;
1307         return true;
1308 }
1309
1310 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1311 {
1312         lockdep_assert_held(&sdata->local->mtx);
1313
1314         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1315                                 IEEE80211_STA_BEACON_POLL);
1316         ieee80211_run_deferred_scan(sdata->local);
1317 }
1318
1319 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1320 {
1321         mutex_lock(&sdata->local->mtx);
1322         __ieee80211_stop_poll(sdata);
1323         mutex_unlock(&sdata->local->mtx);
1324 }
1325
1326 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1327                                            u16 capab, bool erp_valid, u8 erp)
1328 {
1329         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1330         u32 changed = 0;
1331         bool use_protection;
1332         bool use_short_preamble;
1333         bool use_short_slot;
1334
1335         if (erp_valid) {
1336                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1337                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1338         } else {
1339                 use_protection = false;
1340                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1341         }
1342
1343         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1344         if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1345                 use_short_slot = true;
1346
1347         if (use_protection != bss_conf->use_cts_prot) {
1348                 bss_conf->use_cts_prot = use_protection;
1349                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1350         }
1351
1352         if (use_short_preamble != bss_conf->use_short_preamble) {
1353                 bss_conf->use_short_preamble = use_short_preamble;
1354                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1355         }
1356
1357         if (use_short_slot != bss_conf->use_short_slot) {
1358                 bss_conf->use_short_slot = use_short_slot;
1359                 changed |= BSS_CHANGED_ERP_SLOT;
1360         }
1361
1362         return changed;
1363 }
1364
1365 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1366                                      struct cfg80211_bss *cbss,
1367                                      u32 bss_info_changed)
1368 {
1369         struct ieee80211_bss *bss = (void *)cbss->priv;
1370         struct ieee80211_local *local = sdata->local;
1371         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1372
1373         bss_info_changed |= BSS_CHANGED_ASSOC;
1374         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1375                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1376
1377         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1378                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1379
1380         sdata->u.mgd.associated = cbss;
1381         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1382
1383         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1384
1385         if (sdata->vif.p2p) {
1386                 const struct cfg80211_bss_ies *ies;
1387
1388                 rcu_read_lock();
1389                 ies = rcu_dereference(cbss->ies);
1390                 if (ies) {
1391                         u8 noa[2];
1392                         int ret;
1393
1394                         ret = cfg80211_get_p2p_attr(
1395                                         ies->data, ies->len,
1396                                         IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
1397                                         noa, sizeof(noa));
1398                         if (ret >= 2) {
1399                                 bss_conf->p2p_oppps = noa[1] & 0x80;
1400                                 bss_conf->p2p_ctwindow = noa[1] & 0x7f;
1401                                 bss_info_changed |= BSS_CHANGED_P2P_PS;
1402                                 sdata->u.mgd.p2p_noa_index = noa[0];
1403                         }
1404                 }
1405                 rcu_read_unlock();
1406         }
1407
1408         /* just to be sure */
1409         ieee80211_stop_poll(sdata);
1410
1411         ieee80211_led_assoc(local, 1);
1412
1413         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1414                 bss_conf->dtim_period = bss->dtim_period;
1415         else
1416                 bss_conf->dtim_period = 0;
1417
1418         bss_conf->assoc = 1;
1419
1420         /* Tell the driver to monitor connection quality (if supported) */
1421         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1422             bss_conf->cqm_rssi_thold)
1423                 bss_info_changed |= BSS_CHANGED_CQM;
1424
1425         /* Enable ARP filtering */
1426         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1427                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1428                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1429         }
1430
1431         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1432
1433         mutex_lock(&local->iflist_mtx);
1434         ieee80211_recalc_ps(local, -1);
1435         mutex_unlock(&local->iflist_mtx);
1436
1437         ieee80211_recalc_smps(sdata);
1438         ieee80211_recalc_ps_vif(sdata);
1439
1440         netif_tx_start_all_queues(sdata->dev);
1441         netif_carrier_on(sdata->dev);
1442 }
1443
1444 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1445                                    u16 stype, u16 reason, bool tx,
1446                                    u8 *frame_buf)
1447 {
1448         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1449         struct ieee80211_local *local = sdata->local;
1450         struct sta_info *sta;
1451         u32 changed = 0;
1452
1453         ASSERT_MGD_MTX(ifmgd);
1454
1455         if (WARN_ON_ONCE(tx && !frame_buf))
1456                 return;
1457
1458         if (WARN_ON(!ifmgd->associated))
1459                 return;
1460
1461         ieee80211_stop_poll(sdata);
1462
1463         ifmgd->associated = NULL;
1464
1465         /*
1466          * we need to commit the associated = NULL change because the
1467          * scan code uses that to determine whether this iface should
1468          * go to/wake up from powersave or not -- and could otherwise
1469          * wake the queues erroneously.
1470          */
1471         smp_mb();
1472
1473         /*
1474          * Thus, we can only afterwards stop the queues -- to account
1475          * for the case where another CPU is finishing a scan at this
1476          * time -- we don't want the scan code to enable queues.
1477          */
1478
1479         netif_tx_stop_all_queues(sdata->dev);
1480         netif_carrier_off(sdata->dev);
1481
1482         mutex_lock(&local->sta_mtx);
1483         sta = sta_info_get(sdata, ifmgd->bssid);
1484         if (sta) {
1485                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1486                 ieee80211_sta_tear_down_BA_sessions(sta, false);
1487         }
1488         mutex_unlock(&local->sta_mtx);
1489
1490         /*
1491          * if we want to get out of ps before disassoc (why?) we have
1492          * to do it before sending disassoc, as otherwise the null-packet
1493          * won't be valid.
1494          */
1495         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1496                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1497                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1498         }
1499         local->ps_sdata = NULL;
1500
1501         /* disable per-vif ps */
1502         ieee80211_recalc_ps_vif(sdata);
1503
1504         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1505         if (tx)
1506                 drv_flush(local, false);
1507
1508         /* deauthenticate/disassociate now */
1509         if (tx || frame_buf)
1510                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1511                                                reason, tx, frame_buf);
1512
1513         /* flush out frame */
1514         if (tx)
1515                 drv_flush(local, false);
1516
1517         /* clear bssid only after building the needed mgmt frames */
1518         memset(ifmgd->bssid, 0, ETH_ALEN);
1519
1520         /* remove AP and TDLS peers */
1521         sta_info_flush(local, sdata);
1522
1523         /* finally reset all BSS / config parameters */
1524         changed |= ieee80211_reset_erp_info(sdata);
1525
1526         ieee80211_led_assoc(local, 0);
1527         changed |= BSS_CHANGED_ASSOC;
1528         sdata->vif.bss_conf.assoc = false;
1529
1530         sdata->vif.bss_conf.p2p_ctwindow = 0;
1531         sdata->vif.bss_conf.p2p_oppps = false;
1532
1533         /* on the next assoc, re-program HT parameters */
1534         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1535         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1536
1537         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1538
1539         del_timer_sync(&local->dynamic_ps_timer);
1540         cancel_work_sync(&local->dynamic_ps_enable_work);
1541
1542         /* Disable ARP filtering */
1543         if (sdata->vif.bss_conf.arp_filter_enabled) {
1544                 sdata->vif.bss_conf.arp_filter_enabled = false;
1545                 changed |= BSS_CHANGED_ARP_FILTER;
1546         }
1547
1548         sdata->vif.bss_conf.qos = false;
1549         changed |= BSS_CHANGED_QOS;
1550
1551         /* The BSSID (not really interesting) and HT changed */
1552         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1553         ieee80211_bss_info_change_notify(sdata, changed);
1554
1555         /* disassociated - set to defaults now */
1556         ieee80211_set_wmm_default(sdata, false);
1557
1558         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1559         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1560         del_timer_sync(&sdata->u.mgd.timer);
1561         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1562
1563         sdata->u.mgd.timers_running = 0;
1564
1565         ifmgd->flags = 0;
1566         ieee80211_vif_release_channel(sdata);
1567 }
1568
1569 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1570                              struct ieee80211_hdr *hdr)
1571 {
1572         /*
1573          * We can postpone the mgd.timer whenever receiving unicast frames
1574          * from AP because we know that the connection is working both ways
1575          * at that time. But multicast frames (and hence also beacons) must
1576          * be ignored here, because we need to trigger the timer during
1577          * data idle periods for sending the periodic probe request to the
1578          * AP we're connected to.
1579          */
1580         if (is_multicast_ether_addr(hdr->addr1))
1581                 return;
1582
1583         ieee80211_sta_reset_conn_monitor(sdata);
1584 }
1585
1586 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1587 {
1588         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1589         struct ieee80211_local *local = sdata->local;
1590
1591         mutex_lock(&local->mtx);
1592         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1593                               IEEE80211_STA_CONNECTION_POLL))) {
1594                 mutex_unlock(&local->mtx);
1595                 return;
1596         }
1597
1598         __ieee80211_stop_poll(sdata);
1599
1600         mutex_lock(&local->iflist_mtx);
1601         ieee80211_recalc_ps(local, -1);
1602         mutex_unlock(&local->iflist_mtx);
1603
1604         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1605                 goto out;
1606
1607         /*
1608          * We've received a probe response, but are not sure whether
1609          * we have or will be receiving any beacons or data, so let's
1610          * schedule the timers again, just in case.
1611          */
1612         ieee80211_sta_reset_beacon_monitor(sdata);
1613
1614         mod_timer(&ifmgd->conn_mon_timer,
1615                   round_jiffies_up(jiffies +
1616                                    IEEE80211_CONNECTION_IDLE_TIME));
1617 out:
1618         mutex_unlock(&local->mtx);
1619 }
1620
1621 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1622                              struct ieee80211_hdr *hdr, bool ack)
1623 {
1624         if (!ieee80211_is_data(hdr->frame_control))
1625             return;
1626
1627         if (ack)
1628                 ieee80211_sta_reset_conn_monitor(sdata);
1629
1630         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1631             sdata->u.mgd.probe_send_count > 0) {
1632                 if (ack)
1633                         sdata->u.mgd.probe_send_count = 0;
1634                 else
1635                         sdata->u.mgd.nullfunc_failed = true;
1636                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1637         }
1638 }
1639
1640 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1641 {
1642         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1643         const u8 *ssid;
1644         u8 *dst = ifmgd->associated->bssid;
1645         u8 unicast_limit = max(1, max_probe_tries - 3);
1646
1647         /*
1648          * Try sending broadcast probe requests for the last three
1649          * probe requests after the first ones failed since some
1650          * buggy APs only support broadcast probe requests.
1651          */
1652         if (ifmgd->probe_send_count >= unicast_limit)
1653                 dst = NULL;
1654
1655         /*
1656          * When the hardware reports an accurate Tx ACK status, it's
1657          * better to send a nullfunc frame instead of a probe request,
1658          * as it will kick us off the AP quickly if we aren't associated
1659          * anymore. The timeout will be reset if the frame is ACKed by
1660          * the AP.
1661          */
1662         ifmgd->probe_send_count++;
1663
1664         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1665                 ifmgd->nullfunc_failed = false;
1666                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1667         } else {
1668                 int ssid_len;
1669
1670                 rcu_read_lock();
1671                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1672                 if (WARN_ON_ONCE(ssid == NULL))
1673                         ssid_len = 0;
1674                 else
1675                         ssid_len = ssid[1];
1676
1677                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1678                                          0, (u32) -1, true, false,
1679                                          ifmgd->associated->channel, false);
1680                 rcu_read_unlock();
1681         }
1682
1683         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1684         run_again(ifmgd, ifmgd->probe_timeout);
1685         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1686                 drv_flush(sdata->local, false);
1687 }
1688
1689 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1690                                    bool beacon)
1691 {
1692         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1693         bool already = false;
1694
1695         if (!ieee80211_sdata_running(sdata))
1696                 return;
1697
1698         mutex_lock(&ifmgd->mtx);
1699
1700         if (!ifmgd->associated)
1701                 goto out;
1702
1703         mutex_lock(&sdata->local->mtx);
1704
1705         if (sdata->local->tmp_channel || sdata->local->scanning) {
1706                 mutex_unlock(&sdata->local->mtx);
1707                 goto out;
1708         }
1709
1710         if (beacon)
1711                 mlme_dbg_ratelimited(sdata,
1712                                      "detected beacon loss from AP - sending probe request\n");
1713
1714         ieee80211_cqm_rssi_notify(&sdata->vif,
1715                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1716
1717         /*
1718          * The driver/our work has already reported this event or the
1719          * connection monitoring has kicked in and we have already sent
1720          * a probe request. Or maybe the AP died and the driver keeps
1721          * reporting until we disassociate...
1722          *
1723          * In either case we have to ignore the current call to this
1724          * function (except for setting the correct probe reason bit)
1725          * because otherwise we would reset the timer every time and
1726          * never check whether we received a probe response!
1727          */
1728         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1729                             IEEE80211_STA_CONNECTION_POLL))
1730                 already = true;
1731
1732         if (beacon)
1733                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1734         else
1735                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1736
1737         mutex_unlock(&sdata->local->mtx);
1738
1739         if (already)
1740                 goto out;
1741
1742         mutex_lock(&sdata->local->iflist_mtx);
1743         ieee80211_recalc_ps(sdata->local, -1);
1744         mutex_unlock(&sdata->local->iflist_mtx);
1745
1746         ifmgd->probe_send_count = 0;
1747         ieee80211_mgd_probe_ap_send(sdata);
1748  out:
1749         mutex_unlock(&ifmgd->mtx);
1750 }
1751
1752 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1753                                           struct ieee80211_vif *vif)
1754 {
1755         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1756         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1757         struct cfg80211_bss *cbss;
1758         struct sk_buff *skb;
1759         const u8 *ssid;
1760         int ssid_len;
1761
1762         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1763                 return NULL;
1764
1765         ASSERT_MGD_MTX(ifmgd);
1766
1767         if (ifmgd->associated)
1768                 cbss = ifmgd->associated;
1769         else if (ifmgd->auth_data)
1770                 cbss = ifmgd->auth_data->bss;
1771         else if (ifmgd->assoc_data)
1772                 cbss = ifmgd->assoc_data->bss;
1773         else
1774                 return NULL;
1775
1776         rcu_read_lock();
1777         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1778         if (WARN_ON_ONCE(ssid == NULL))
1779                 ssid_len = 0;
1780         else
1781                 ssid_len = ssid[1];
1782
1783         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1784                                         (u32) -1, cbss->channel,
1785                                         ssid + 2, ssid_len,
1786                                         NULL, 0, true);
1787         rcu_read_unlock();
1788
1789         return skb;
1790 }
1791 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1792
1793 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata,
1794                                    bool transmit_frame)
1795 {
1796         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1797         struct ieee80211_local *local = sdata->local;
1798         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1799
1800         mutex_lock(&ifmgd->mtx);
1801         if (!ifmgd->associated) {
1802                 mutex_unlock(&ifmgd->mtx);
1803                 return;
1804         }
1805
1806         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1807                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1808                                transmit_frame, frame_buf);
1809         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1810         mutex_unlock(&ifmgd->mtx);
1811
1812         /*
1813          * must be outside lock due to cfg80211,
1814          * but that's not a problem.
1815          */
1816         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
1817
1818         mutex_lock(&local->mtx);
1819         ieee80211_recalc_idle(local);
1820         mutex_unlock(&local->mtx);
1821 }
1822
1823 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1824 {
1825         struct ieee80211_sub_if_data *sdata =
1826                 container_of(work, struct ieee80211_sub_if_data,
1827                              u.mgd.beacon_connection_loss_work);
1828         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1829         struct sta_info *sta;
1830
1831         if (ifmgd->associated) {
1832                 rcu_read_lock();
1833                 sta = sta_info_get(sdata, ifmgd->bssid);
1834                 if (sta)
1835                         sta->beacon_loss_count++;
1836                 rcu_read_unlock();
1837         }
1838
1839         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) {
1840                 sdata_info(sdata, "Connection to AP %pM lost\n",
1841                            ifmgd->bssid);
1842                 __ieee80211_disconnect(sdata, false);
1843         } else {
1844                 ieee80211_mgd_probe_ap(sdata, true);
1845         }
1846 }
1847
1848 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
1849 {
1850         struct ieee80211_sub_if_data *sdata =
1851                 container_of(work, struct ieee80211_sub_if_data,
1852                              u.mgd.csa_connection_drop_work);
1853
1854         ieee80211_wake_queues_by_reason(&sdata->local->hw,
1855                                         IEEE80211_QUEUE_STOP_REASON_CSA);
1856         __ieee80211_disconnect(sdata, true);
1857 }
1858
1859 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1860 {
1861         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1862         struct ieee80211_hw *hw = &sdata->local->hw;
1863
1864         trace_api_beacon_loss(sdata);
1865
1866         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1867         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1868 }
1869 EXPORT_SYMBOL(ieee80211_beacon_loss);
1870
1871 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1872 {
1873         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1874         struct ieee80211_hw *hw = &sdata->local->hw;
1875
1876         trace_api_connection_loss(sdata);
1877
1878         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1879         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1880 }
1881 EXPORT_SYMBOL(ieee80211_connection_loss);
1882
1883
1884 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1885                                         bool assoc)
1886 {
1887         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1888
1889         lockdep_assert_held(&sdata->u.mgd.mtx);
1890
1891         if (!assoc) {
1892                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1893
1894                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1895                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1896                 sdata->u.mgd.flags = 0;
1897                 ieee80211_vif_release_channel(sdata);
1898         }
1899
1900         cfg80211_put_bss(auth_data->bss);
1901         kfree(auth_data);
1902         sdata->u.mgd.auth_data = NULL;
1903 }
1904
1905 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1906                                      struct ieee80211_mgmt *mgmt, size_t len)
1907 {
1908         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1909         u8 *pos;
1910         struct ieee802_11_elems elems;
1911
1912         pos = mgmt->u.auth.variable;
1913         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1914         if (!elems.challenge)
1915                 return;
1916         auth_data->expected_transaction = 4;
1917         drv_mgd_prepare_tx(sdata->local, sdata);
1918         ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
1919                             elems.challenge - 2, elems.challenge_len + 2,
1920                             auth_data->bss->bssid, auth_data->bss->bssid,
1921                             auth_data->key, auth_data->key_len,
1922                             auth_data->key_idx);
1923 }
1924
1925 static enum rx_mgmt_action __must_check
1926 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1927                        struct ieee80211_mgmt *mgmt, size_t len)
1928 {
1929         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1930         u8 bssid[ETH_ALEN];
1931         u16 auth_alg, auth_transaction, status_code;
1932         struct sta_info *sta;
1933
1934         lockdep_assert_held(&ifmgd->mtx);
1935
1936         if (len < 24 + 6)
1937                 return RX_MGMT_NONE;
1938
1939         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1940                 return RX_MGMT_NONE;
1941
1942         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1943
1944         if (!ether_addr_equal(bssid, mgmt->bssid))
1945                 return RX_MGMT_NONE;
1946
1947         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1948         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1949         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1950
1951         if (auth_alg != ifmgd->auth_data->algorithm ||
1952             auth_transaction != ifmgd->auth_data->expected_transaction) {
1953                 sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
1954                            mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
1955                            auth_transaction,
1956                            ifmgd->auth_data->expected_transaction);
1957                 return RX_MGMT_NONE;
1958         }
1959
1960         if (status_code != WLAN_STATUS_SUCCESS) {
1961                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1962                            mgmt->sa, status_code);
1963                 ieee80211_destroy_auth_data(sdata, false);
1964                 return RX_MGMT_CFG80211_RX_AUTH;
1965         }
1966
1967         switch (ifmgd->auth_data->algorithm) {
1968         case WLAN_AUTH_OPEN:
1969         case WLAN_AUTH_LEAP:
1970         case WLAN_AUTH_FT:
1971         case WLAN_AUTH_SAE:
1972                 break;
1973         case WLAN_AUTH_SHARED_KEY:
1974                 if (ifmgd->auth_data->expected_transaction != 4) {
1975                         ieee80211_auth_challenge(sdata, mgmt, len);
1976                         /* need another frame */
1977                         return RX_MGMT_NONE;
1978                 }
1979                 break;
1980         default:
1981                 WARN_ONCE(1, "invalid auth alg %d",
1982                           ifmgd->auth_data->algorithm);
1983                 return RX_MGMT_NONE;
1984         }
1985
1986         sdata_info(sdata, "authenticated\n");
1987         ifmgd->auth_data->done = true;
1988         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1989         run_again(ifmgd, ifmgd->auth_data->timeout);
1990
1991         if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
1992             ifmgd->auth_data->expected_transaction != 2) {
1993                 /*
1994                  * Report auth frame to user space for processing since another
1995                  * round of Authentication frames is still needed.
1996                  */
1997                 return RX_MGMT_CFG80211_RX_AUTH;
1998         }
1999
2000         /* move station state to auth */
2001         mutex_lock(&sdata->local->sta_mtx);
2002         sta = sta_info_get(sdata, bssid);
2003         if (!sta) {
2004                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
2005                 goto out_err;
2006         }
2007         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
2008                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
2009                 goto out_err;
2010         }
2011         mutex_unlock(&sdata->local->sta_mtx);
2012
2013         return RX_MGMT_CFG80211_RX_AUTH;
2014  out_err:
2015         mutex_unlock(&sdata->local->sta_mtx);
2016         /* ignore frame -- wait for timeout */
2017         return RX_MGMT_NONE;
2018 }
2019
2020
2021 static enum rx_mgmt_action __must_check
2022 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
2023                          struct ieee80211_mgmt *mgmt, size_t len)
2024 {
2025         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2026         const u8 *bssid = NULL;
2027         u16 reason_code;
2028
2029         lockdep_assert_held(&ifmgd->mtx);
2030
2031         if (len < 24 + 2)
2032                 return RX_MGMT_NONE;
2033
2034         if (!ifmgd->associated ||
2035             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2036                 return RX_MGMT_NONE;
2037
2038         bssid = ifmgd->associated->bssid;
2039
2040         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2041
2042         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
2043                    bssid, reason_code);
2044
2045         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2046
2047         mutex_lock(&sdata->local->mtx);
2048         ieee80211_recalc_idle(sdata->local);
2049         mutex_unlock(&sdata->local->mtx);
2050
2051         return RX_MGMT_CFG80211_DEAUTH;
2052 }
2053
2054
2055 static enum rx_mgmt_action __must_check
2056 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
2057                            struct ieee80211_mgmt *mgmt, size_t len)
2058 {
2059         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2060         u16 reason_code;
2061
2062         lockdep_assert_held(&ifmgd->mtx);
2063
2064         if (len < 24 + 2)
2065                 return RX_MGMT_NONE;
2066
2067         if (!ifmgd->associated ||
2068             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2069                 return RX_MGMT_NONE;
2070
2071         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
2072
2073         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
2074                    mgmt->sa, reason_code);
2075
2076         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2077
2078         mutex_lock(&sdata->local->mtx);
2079         ieee80211_recalc_idle(sdata->local);
2080         mutex_unlock(&sdata->local->mtx);
2081
2082         return RX_MGMT_CFG80211_DISASSOC;
2083 }
2084
2085 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
2086                                 u8 *supp_rates, unsigned int supp_rates_len,
2087                                 u32 *rates, u32 *basic_rates,
2088                                 bool *have_higher_than_11mbit,
2089                                 int *min_rate, int *min_rate_index)
2090 {
2091         int i, j;
2092
2093         for (i = 0; i < supp_rates_len; i++) {
2094                 int rate = (supp_rates[i] & 0x7f) * 5;
2095                 bool is_basic = !!(supp_rates[i] & 0x80);
2096
2097                 if (rate > 110)
2098                         *have_higher_than_11mbit = true;
2099
2100                 /*
2101                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
2102                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
2103                  *
2104                  * Note: Even through the membership selector and the basic
2105                  *       rate flag share the same bit, they are not exactly
2106                  *       the same.
2107                  */
2108                 if (!!(supp_rates[i] & 0x80) &&
2109                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2110                         continue;
2111
2112                 for (j = 0; j < sband->n_bitrates; j++) {
2113                         if (sband->bitrates[j].bitrate == rate) {
2114                                 *rates |= BIT(j);
2115                                 if (is_basic)
2116                                         *basic_rates |= BIT(j);
2117                                 if (rate < *min_rate) {
2118                                         *min_rate = rate;
2119                                         *min_rate_index = j;
2120                                 }
2121                                 break;
2122                         }
2123                 }
2124         }
2125 }
2126
2127 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2128                                          bool assoc)
2129 {
2130         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2131
2132         lockdep_assert_held(&sdata->u.mgd.mtx);
2133
2134         if (!assoc) {
2135                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2136
2137                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2138                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2139                 sdata->u.mgd.flags = 0;
2140                 ieee80211_vif_release_channel(sdata);
2141         }
2142
2143         kfree(assoc_data);
2144         sdata->u.mgd.assoc_data = NULL;
2145 }
2146
2147 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2148                                     struct cfg80211_bss *cbss,
2149                                     struct ieee80211_mgmt *mgmt, size_t len)
2150 {
2151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2152         struct ieee80211_local *local = sdata->local;
2153         struct ieee80211_supported_band *sband;
2154         struct sta_info *sta;
2155         u8 *pos;
2156         u16 capab_info, aid;
2157         struct ieee802_11_elems elems;
2158         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2159         u32 changed = 0;
2160         int err;
2161
2162         /* AssocResp and ReassocResp have identical structure */
2163
2164         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2165         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2166
2167         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2168                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2169                            aid);
2170         aid &= ~(BIT(15) | BIT(14));
2171
2172         ifmgd->broken_ap = false;
2173
2174         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2175                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2176                            aid);
2177                 aid = 0;
2178                 ifmgd->broken_ap = true;
2179         }
2180
2181         pos = mgmt->u.assoc_resp.variable;
2182         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2183
2184         if (!elems.supp_rates) {
2185                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2186                 return false;
2187         }
2188
2189         ifmgd->aid = aid;
2190
2191         mutex_lock(&sdata->local->sta_mtx);
2192         /*
2193          * station info was already allocated and inserted before
2194          * the association and should be available to us
2195          */
2196         sta = sta_info_get(sdata, cbss->bssid);
2197         if (WARN_ON(!sta)) {
2198                 mutex_unlock(&sdata->local->sta_mtx);
2199                 return false;
2200         }
2201
2202         sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2203
2204         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2205                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2206                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2207
2208         sta->supports_40mhz =
2209                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2210
2211         if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
2212                 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2213                                                     elems.vht_cap_elem,
2214                                                     &sta->sta.vht_cap);
2215
2216         rate_control_rate_init(sta);
2217
2218         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2219                 set_sta_flag(sta, WLAN_STA_MFP);
2220
2221         if (elems.wmm_param)
2222                 set_sta_flag(sta, WLAN_STA_WME);
2223
2224         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2225         if (!err)
2226                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2227         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2228                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2229         if (err) {
2230                 sdata_info(sdata,
2231                            "failed to move station %pM to desired state\n",
2232                            sta->sta.addr);
2233                 WARN_ON(__sta_info_destroy(sta));
2234                 mutex_unlock(&sdata->local->sta_mtx);
2235                 return false;
2236         }
2237
2238         mutex_unlock(&sdata->local->sta_mtx);
2239
2240         /*
2241          * Always handle WMM once after association regardless
2242          * of the first value the AP uses. Setting -1 here has
2243          * that effect because the AP values is an unsigned
2244          * 4-bit value.
2245          */
2246         ifmgd->wmm_last_param_set = -1;
2247
2248         if (elems.wmm_param)
2249                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2250                                          elems.wmm_param_len);
2251         else
2252                 ieee80211_set_wmm_default(sdata, false);
2253         changed |= BSS_CHANGED_QOS;
2254
2255         if (elems.ht_operation && elems.wmm_param &&
2256             !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2257                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2258                                                   cbss->bssid, false);
2259
2260         /* set AID and assoc capability,
2261          * ieee80211_set_associated() will tell the driver */
2262         bss_conf->aid = aid;
2263         bss_conf->assoc_capability = capab_info;
2264         ieee80211_set_associated(sdata, cbss, changed);
2265
2266         /*
2267          * If we're using 4-addr mode, let the AP know that we're
2268          * doing so, so that it can create the STA VLAN on its side
2269          */
2270         if (ifmgd->use_4addr)
2271                 ieee80211_send_4addr_nullfunc(local, sdata);
2272
2273         /*
2274          * Start timer to probe the connection to the AP now.
2275          * Also start the timer that will detect beacon loss.
2276          */
2277         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2278         ieee80211_sta_reset_beacon_monitor(sdata);
2279
2280         return true;
2281 }
2282
2283 static enum rx_mgmt_action __must_check
2284 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2285                              struct ieee80211_mgmt *mgmt, size_t len,
2286                              struct cfg80211_bss **bss)
2287 {
2288         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2289         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2290         u16 capab_info, status_code, aid;
2291         struct ieee802_11_elems elems;
2292         u8 *pos;
2293         bool reassoc;
2294
2295         lockdep_assert_held(&ifmgd->mtx);
2296
2297         if (!assoc_data)
2298                 return RX_MGMT_NONE;
2299         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2300                 return RX_MGMT_NONE;
2301
2302         /*
2303          * AssocResp and ReassocResp have identical structure, so process both
2304          * of them in this function.
2305          */
2306
2307         if (len < 24 + 6)
2308                 return RX_MGMT_NONE;
2309
2310         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2311         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2312         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2313         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2314
2315         sdata_info(sdata,
2316                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2317                    reassoc ? "Rea" : "A", mgmt->sa,
2318                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2319
2320         pos = mgmt->u.assoc_resp.variable;
2321         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2322
2323         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2324             elems.timeout_int && elems.timeout_int_len == 5 &&
2325             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2326                 u32 tu, ms;
2327                 tu = get_unaligned_le32(elems.timeout_int + 1);
2328                 ms = tu * 1024 / 1000;
2329                 sdata_info(sdata,
2330                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2331                            mgmt->sa, tu, ms);
2332                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2333                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2334                         run_again(ifmgd, assoc_data->timeout);
2335                 return RX_MGMT_NONE;
2336         }
2337
2338         *bss = assoc_data->bss;
2339
2340         if (status_code != WLAN_STATUS_SUCCESS) {
2341                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2342                            mgmt->sa, status_code);
2343                 ieee80211_destroy_assoc_data(sdata, false);
2344         } else {
2345                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2346                         /* oops -- internal error -- send timeout for now */
2347                         ieee80211_destroy_assoc_data(sdata, false);
2348                         cfg80211_put_bss(*bss);
2349                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2350                 }
2351                 sdata_info(sdata, "associated\n");
2352
2353                 /*
2354                  * destroy assoc_data afterwards, as otherwise an idle
2355                  * recalc after assoc_data is NULL but before associated
2356                  * is set can cause the interface to go idle
2357                  */
2358                 ieee80211_destroy_assoc_data(sdata, true);
2359         }
2360
2361         return RX_MGMT_CFG80211_RX_ASSOC;
2362 }
2363
2364 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2365                                   struct ieee80211_mgmt *mgmt, size_t len,
2366                                   struct ieee80211_rx_status *rx_status,
2367                                   struct ieee802_11_elems *elems,
2368                                   bool beacon)
2369 {
2370         struct ieee80211_local *local = sdata->local;
2371         int freq;
2372         struct ieee80211_bss *bss;
2373         struct ieee80211_channel *channel;
2374         bool need_ps = false;
2375
2376         if (sdata->u.mgd.associated &&
2377             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2378                 bss = (void *)sdata->u.mgd.associated->priv;
2379                 /* not previously set so we may need to recalc */
2380                 need_ps = !bss->dtim_period;
2381         }
2382
2383         if (elems->ds_params && elems->ds_params_len == 1)
2384                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2385                                                       rx_status->band);
2386         else
2387                 freq = rx_status->freq;
2388
2389         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2390
2391         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2392                 return;
2393
2394         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2395                                         channel, beacon);
2396         if (bss)
2397                 ieee80211_rx_bss_put(local, bss);
2398
2399         if (!sdata->u.mgd.associated)
2400                 return;
2401
2402         if (need_ps) {
2403                 mutex_lock(&local->iflist_mtx);
2404                 ieee80211_recalc_ps(local, -1);
2405                 mutex_unlock(&local->iflist_mtx);
2406         }
2407
2408         if (elems->ch_switch_ie &&
2409             memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2410                 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2411                                                  bss, rx_status->mactime);
2412 }
2413
2414
2415 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2416                                          struct sk_buff *skb)
2417 {
2418         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2419         struct ieee80211_if_managed *ifmgd;
2420         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2421         size_t baselen, len = skb->len;
2422         struct ieee802_11_elems elems;
2423
2424         ifmgd = &sdata->u.mgd;
2425
2426         ASSERT_MGD_MTX(ifmgd);
2427
2428         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2429                 return; /* ignore ProbeResp to foreign address */
2430
2431         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2432         if (baselen > len)
2433                 return;
2434
2435         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2436                                 &elems);
2437
2438         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2439
2440         if (ifmgd->associated &&
2441             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2442                 ieee80211_reset_ap_probe(sdata);
2443
2444         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2445             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2446                 /* got probe response, continue with auth */
2447                 sdata_info(sdata, "direct probe responded\n");
2448                 ifmgd->auth_data->tries = 0;
2449                 ifmgd->auth_data->timeout = jiffies;
2450                 run_again(ifmgd, ifmgd->auth_data->timeout);
2451         }
2452 }
2453
2454 /*
2455  * This is the canonical list of information elements we care about,
2456  * the filter code also gives us all changes to the Microsoft OUI
2457  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2458  *
2459  * We implement beacon filtering in software since that means we can
2460  * avoid processing the frame here and in cfg80211, and userspace
2461  * will not be able to tell whether the hardware supports it or not.
2462  *
2463  * XXX: This list needs to be dynamic -- userspace needs to be able to
2464  *      add items it requires. It also needs to be able to tell us to
2465  *      look out for other vendor IEs.
2466  */
2467 static const u64 care_about_ies =
2468         (1ULL << WLAN_EID_COUNTRY) |
2469         (1ULL << WLAN_EID_ERP_INFO) |
2470         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2471         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2472         (1ULL << WLAN_EID_HT_CAPABILITY) |
2473         (1ULL << WLAN_EID_HT_OPERATION);
2474
2475 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2476                                      struct ieee80211_mgmt *mgmt,
2477                                      size_t len,
2478                                      struct ieee80211_rx_status *rx_status)
2479 {
2480         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2481         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2482         size_t baselen;
2483         struct ieee802_11_elems elems;
2484         struct ieee80211_local *local = sdata->local;
2485         struct ieee80211_chanctx_conf *chanctx_conf;
2486         struct ieee80211_channel *chan;
2487         u32 changed = 0;
2488         bool erp_valid;
2489         u8 erp_value = 0;
2490         u32 ncrc;
2491         u8 *bssid;
2492
2493         lockdep_assert_held(&ifmgd->mtx);
2494
2495         /* Process beacon from the current BSS */
2496         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2497         if (baselen > len)
2498                 return;
2499
2500         rcu_read_lock();
2501         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2502         if (!chanctx_conf) {
2503                 rcu_read_unlock();
2504                 return;
2505         }
2506
2507         if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
2508                 rcu_read_unlock();
2509                 return;
2510         }
2511         chan = chanctx_conf->def.chan;
2512         rcu_read_unlock();
2513
2514         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2515             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2516                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2517                                        len - baselen, &elems);
2518
2519                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2520                                       false);
2521                 ifmgd->assoc_data->have_beacon = true;
2522                 ifmgd->assoc_data->sent_assoc = false;
2523                 /* continue assoc process */
2524                 ifmgd->assoc_data->timeout = jiffies;
2525                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2526                 return;
2527         }
2528
2529         if (!ifmgd->associated ||
2530             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2531                 return;
2532         bssid = ifmgd->associated->bssid;
2533
2534         /* Track average RSSI from the Beacon frames of the current AP */
2535         ifmgd->last_beacon_signal = rx_status->signal;
2536         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2537                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2538                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2539                 ifmgd->last_cqm_event_signal = 0;
2540                 ifmgd->count_beacon_signal = 1;
2541                 ifmgd->last_ave_beacon_signal = 0;
2542         } else {
2543                 ifmgd->ave_beacon_signal =
2544                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2545                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2546                          ifmgd->ave_beacon_signal) / 16;
2547                 ifmgd->count_beacon_signal++;
2548         }
2549
2550         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2551             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2552                 int sig = ifmgd->ave_beacon_signal;
2553                 int last_sig = ifmgd->last_ave_beacon_signal;
2554
2555                 /*
2556                  * if signal crosses either of the boundaries, invoke callback
2557                  * with appropriate parameters
2558                  */
2559                 if (sig > ifmgd->rssi_max_thold &&
2560                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2561                         ifmgd->last_ave_beacon_signal = sig;
2562                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2563                 } else if (sig < ifmgd->rssi_min_thold &&
2564                            (last_sig >= ifmgd->rssi_max_thold ||
2565                            last_sig == 0)) {
2566                         ifmgd->last_ave_beacon_signal = sig;
2567                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2568                 }
2569         }
2570
2571         if (bss_conf->cqm_rssi_thold &&
2572             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2573             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2574                 int sig = ifmgd->ave_beacon_signal / 16;
2575                 int last_event = ifmgd->last_cqm_event_signal;
2576                 int thold = bss_conf->cqm_rssi_thold;
2577                 int hyst = bss_conf->cqm_rssi_hyst;
2578                 if (sig < thold &&
2579                     (last_event == 0 || sig < last_event - hyst)) {
2580                         ifmgd->last_cqm_event_signal = sig;
2581                         ieee80211_cqm_rssi_notify(
2582                                 &sdata->vif,
2583                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2584                                 GFP_KERNEL);
2585                 } else if (sig > thold &&
2586                            (last_event == 0 || sig > last_event + hyst)) {
2587                         ifmgd->last_cqm_event_signal = sig;
2588                         ieee80211_cqm_rssi_notify(
2589                                 &sdata->vif,
2590                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2591                                 GFP_KERNEL);
2592                 }
2593         }
2594
2595         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2596                 mlme_dbg_ratelimited(sdata,
2597                                      "cancelling probereq poll due to a received beacon\n");
2598                 mutex_lock(&local->mtx);
2599                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2600                 ieee80211_run_deferred_scan(local);
2601                 mutex_unlock(&local->mtx);
2602
2603                 mutex_lock(&local->iflist_mtx);
2604                 ieee80211_recalc_ps(local, -1);
2605                 mutex_unlock(&local->iflist_mtx);
2606         }
2607
2608         /*
2609          * Push the beacon loss detection into the future since
2610          * we are processing a beacon from the AP just now.
2611          */
2612         ieee80211_sta_reset_beacon_monitor(sdata);
2613
2614         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2615         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2616                                           len - baselen, &elems,
2617                                           care_about_ies, ncrc);
2618
2619         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2620                 bool directed_tim = ieee80211_check_tim(elems.tim,
2621                                                         elems.tim_len,
2622                                                         ifmgd->aid);
2623                 if (directed_tim) {
2624                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2625                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2626                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2627                                         ieee80211_hw_config(local,
2628                                                             IEEE80211_CONF_CHANGE_PS);
2629                                 }
2630                                 ieee80211_send_nullfunc(local, sdata, 0);
2631                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2632                                 local->pspolling = true;
2633
2634                                 /*
2635                                  * Here is assumed that the driver will be
2636                                  * able to send ps-poll frame and receive a
2637                                  * response even though power save mode is
2638                                  * enabled, but some drivers might require
2639                                  * to disable power save here. This needs
2640                                  * to be investigated.
2641                                  */
2642                                 ieee80211_send_pspoll(local, sdata);
2643                         }
2644                 }
2645         }
2646
2647         if (sdata->vif.p2p) {
2648                 u8 noa[2];
2649                 int ret;
2650
2651                 ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
2652                                             len - baselen,
2653                                             IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2654                                             noa, sizeof(noa));
2655                 if (ret >= 2 && sdata->u.mgd.p2p_noa_index != noa[0]) {
2656                         bss_conf->p2p_oppps = noa[1] & 0x80;
2657                         bss_conf->p2p_ctwindow = noa[1] & 0x7f;
2658                         changed |= BSS_CHANGED_P2P_PS;
2659                         sdata->u.mgd.p2p_noa_index = noa[0];
2660                         /*
2661                          * make sure we update all information, the CRC
2662                          * mechanism doesn't look at P2P attributes.
2663                          */
2664                         ifmgd->beacon_crc_valid = false;
2665                 }
2666         }
2667
2668         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2669                 return;
2670         ifmgd->beacon_crc = ncrc;
2671         ifmgd->beacon_crc_valid = true;
2672
2673         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2674                               true);
2675
2676         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2677                                      elems.wmm_param_len))
2678                 changed |= BSS_CHANGED_QOS;
2679
2680         if (elems.erp_info && elems.erp_info_len >= 1) {
2681                 erp_valid = true;
2682                 erp_value = elems.erp_info[0];
2683         } else {
2684                 erp_valid = false;
2685         }
2686         changed |= ieee80211_handle_bss_capability(sdata,
2687                         le16_to_cpu(mgmt->u.beacon.capab_info),
2688                         erp_valid, erp_value);
2689
2690
2691         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2692             !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
2693                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2694                                                   bssid, true);
2695
2696         if (elems.country_elem && elems.pwr_constr_elem &&
2697             mgmt->u.probe_resp.capab_info &
2698                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
2699                 changed |= ieee80211_handle_pwr_constr(sdata, chan,
2700                                                        elems.country_elem,
2701                                                        elems.country_elem_len,
2702                                                        elems.pwr_constr_elem);
2703
2704         ieee80211_bss_info_change_notify(sdata, changed);
2705 }
2706
2707 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2708                                   struct sk_buff *skb)
2709 {
2710         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2711         struct ieee80211_rx_status *rx_status;
2712         struct ieee80211_mgmt *mgmt;
2713         struct cfg80211_bss *bss = NULL;
2714         enum rx_mgmt_action rma = RX_MGMT_NONE;
2715         u16 fc;
2716
2717         rx_status = (struct ieee80211_rx_status *) skb->cb;
2718         mgmt = (struct ieee80211_mgmt *) skb->data;
2719         fc = le16_to_cpu(mgmt->frame_control);
2720
2721         mutex_lock(&ifmgd->mtx);
2722
2723         switch (fc & IEEE80211_FCTL_STYPE) {
2724         case IEEE80211_STYPE_BEACON:
2725                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2726                 break;
2727         case IEEE80211_STYPE_PROBE_RESP:
2728                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2729                 break;
2730         case IEEE80211_STYPE_AUTH:
2731                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2732                 break;
2733         case IEEE80211_STYPE_DEAUTH:
2734                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2735                 break;
2736         case IEEE80211_STYPE_DISASSOC:
2737                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2738                 break;
2739         case IEEE80211_STYPE_ASSOC_RESP:
2740         case IEEE80211_STYPE_REASSOC_RESP:
2741                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2742                 break;
2743         case IEEE80211_STYPE_ACTION:
2744                 switch (mgmt->u.action.category) {
2745                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2746                         ieee80211_sta_process_chanswitch(sdata,
2747                                         &mgmt->u.action.u.chan_switch.sw_elem,
2748                                         (void *)ifmgd->associated->priv,
2749                                         rx_status->mactime);
2750                         break;
2751                 }
2752         }
2753         mutex_unlock(&ifmgd->mtx);
2754
2755         switch (rma) {
2756         case RX_MGMT_NONE:
2757                 /* no action */
2758                 break;
2759         case RX_MGMT_CFG80211_DEAUTH:
2760                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2761                 break;
2762         case RX_MGMT_CFG80211_DISASSOC:
2763                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2764                 break;
2765         case RX_MGMT_CFG80211_RX_AUTH:
2766                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2767                 break;
2768         case RX_MGMT_CFG80211_RX_ASSOC:
2769                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2770                 break;
2771         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2772                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2773                 break;
2774         default:
2775                 WARN(1, "unexpected: %d", rma);
2776         }
2777 }
2778
2779 static void ieee80211_sta_timer(unsigned long data)
2780 {
2781         struct ieee80211_sub_if_data *sdata =
2782                 (struct ieee80211_sub_if_data *) data;
2783         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2784         struct ieee80211_local *local = sdata->local;
2785
2786         if (local->quiescing) {
2787                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2788                 return;
2789         }
2790
2791         ieee80211_queue_work(&local->hw, &sdata->work);
2792 }
2793
2794 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2795                                           u8 *bssid, u8 reason)
2796 {
2797         struct ieee80211_local *local = sdata->local;
2798         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2799         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2800
2801         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2802                                false, frame_buf);
2803         mutex_unlock(&ifmgd->mtx);
2804
2805         /*
2806          * must be outside lock due to cfg80211,
2807          * but that's not a problem.
2808          */
2809         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2810
2811         mutex_lock(&local->mtx);
2812         ieee80211_recalc_idle(local);
2813         mutex_unlock(&local->mtx);
2814
2815         mutex_lock(&ifmgd->mtx);
2816 }
2817
2818 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2819 {
2820         struct ieee80211_local *local = sdata->local;
2821         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2822         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2823
2824         lockdep_assert_held(&ifmgd->mtx);
2825
2826         if (WARN_ON_ONCE(!auth_data))
2827                 return -EINVAL;
2828
2829         auth_data->tries++;
2830
2831         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2832                 sdata_info(sdata, "authentication with %pM timed out\n",
2833                            auth_data->bss->bssid);
2834
2835                 /*
2836                  * Most likely AP is not in the range so remove the
2837                  * bss struct for that AP.
2838                  */
2839                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2840
2841                 return -ETIMEDOUT;
2842         }
2843
2844         drv_mgd_prepare_tx(local, sdata);
2845
2846         if (auth_data->bss->proberesp_ies) {
2847                 u16 trans = 1;
2848                 u16 status = 0;
2849
2850                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2851                            auth_data->bss->bssid, auth_data->tries,
2852                            IEEE80211_AUTH_MAX_TRIES);
2853
2854                 auth_data->expected_transaction = 2;
2855
2856                 if (auth_data->algorithm == WLAN_AUTH_SAE) {
2857                         trans = auth_data->sae_trans;
2858                         status = auth_data->sae_status;
2859                         auth_data->expected_transaction = trans;
2860                 }
2861
2862                 ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
2863                                     auth_data->data, auth_data->data_len,
2864                                     auth_data->bss->bssid,
2865                                     auth_data->bss->bssid, NULL, 0, 0);
2866         } else {
2867                 const u8 *ssidie;
2868
2869                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2870                            auth_data->bss->bssid, auth_data->tries,
2871                            IEEE80211_AUTH_MAX_TRIES);
2872
2873                 rcu_read_lock();
2874                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2875                 if (!ssidie) {
2876                         rcu_read_unlock();
2877                         return -EINVAL;
2878                 }
2879                 /*
2880                  * Direct probe is sent to broadcast address as some APs
2881                  * will not answer to direct packet in unassociated state.
2882                  */
2883                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2884                                          NULL, 0, (u32) -1, true, false,
2885                                          auth_data->bss->channel, false);
2886                 rcu_read_unlock();
2887         }
2888
2889         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2890         run_again(ifmgd, auth_data->timeout);
2891
2892         return 0;
2893 }
2894
2895 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2896 {
2897         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2898         struct ieee80211_local *local = sdata->local;
2899
2900         lockdep_assert_held(&sdata->u.mgd.mtx);
2901
2902         assoc_data->tries++;
2903         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2904                 sdata_info(sdata, "association with %pM timed out\n",
2905                            assoc_data->bss->bssid);
2906
2907                 /*
2908                  * Most likely AP is not in the range so remove the
2909                  * bss struct for that AP.
2910                  */
2911                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2912
2913                 return -ETIMEDOUT;
2914         }
2915
2916         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2917                    assoc_data->bss->bssid, assoc_data->tries,
2918                    IEEE80211_ASSOC_MAX_TRIES);
2919         ieee80211_send_assoc(sdata);
2920
2921         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2922         run_again(&sdata->u.mgd, assoc_data->timeout);
2923
2924         return 0;
2925 }
2926
2927 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2928 {
2929         struct ieee80211_local *local = sdata->local;
2930         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2931
2932         mutex_lock(&ifmgd->mtx);
2933
2934         if (ifmgd->auth_data &&
2935             time_after(jiffies, ifmgd->auth_data->timeout)) {
2936                 if (ifmgd->auth_data->done) {
2937                         /*
2938                          * ok ... we waited for assoc but userspace didn't,
2939                          * so let's just kill the auth data
2940                          */
2941                         ieee80211_destroy_auth_data(sdata, false);
2942                 } else if (ieee80211_probe_auth(sdata)) {
2943                         u8 bssid[ETH_ALEN];
2944
2945                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2946
2947                         ieee80211_destroy_auth_data(sdata, false);
2948
2949                         mutex_unlock(&ifmgd->mtx);
2950                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2951                         mutex_lock(&ifmgd->mtx);
2952                 }
2953         } else if (ifmgd->auth_data)
2954                 run_again(ifmgd, ifmgd->auth_data->timeout);
2955
2956         if (ifmgd->assoc_data &&
2957             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2958                 if (!ifmgd->assoc_data->have_beacon ||
2959                     ieee80211_do_assoc(sdata)) {
2960                         u8 bssid[ETH_ALEN];
2961
2962                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2963
2964                         ieee80211_destroy_assoc_data(sdata, false);
2965
2966                         mutex_unlock(&ifmgd->mtx);
2967                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2968                         mutex_lock(&ifmgd->mtx);
2969                 }
2970         } else if (ifmgd->assoc_data)
2971                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2972
2973         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2974                             IEEE80211_STA_CONNECTION_POLL) &&
2975             ifmgd->associated) {
2976                 u8 bssid[ETH_ALEN];
2977                 int max_tries;
2978
2979                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2980
2981                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2982                         max_tries = max_nullfunc_tries;
2983                 else
2984                         max_tries = max_probe_tries;
2985
2986                 /* ACK received for nullfunc probing frame */
2987                 if (!ifmgd->probe_send_count)
2988                         ieee80211_reset_ap_probe(sdata);
2989                 else if (ifmgd->nullfunc_failed) {
2990                         if (ifmgd->probe_send_count < max_tries) {
2991                                 mlme_dbg(sdata,
2992                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2993                                          bssid, ifmgd->probe_send_count,
2994                                          max_tries);
2995                                 ieee80211_mgd_probe_ap_send(sdata);
2996                         } else {
2997                                 mlme_dbg(sdata,
2998                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2999                                          bssid);
3000                                 ieee80211_sta_connection_lost(sdata, bssid,
3001                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
3002                         }
3003                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
3004                         run_again(ifmgd, ifmgd->probe_timeout);
3005                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
3006                         mlme_dbg(sdata,
3007                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
3008                                  bssid, probe_wait_ms);
3009                         ieee80211_sta_connection_lost(sdata, bssid,
3010                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
3011                 } else if (ifmgd->probe_send_count < max_tries) {
3012                         mlme_dbg(sdata,
3013                                  "No probe response from AP %pM after %dms, try %d/%i\n",
3014                                  bssid, probe_wait_ms,
3015                                  ifmgd->probe_send_count, max_tries);
3016                         ieee80211_mgd_probe_ap_send(sdata);
3017                 } else {
3018                         /*
3019                          * We actually lost the connection ... or did we?
3020                          * Let's make sure!
3021                          */
3022                         wiphy_debug(local->hw.wiphy,
3023                                     "%s: No probe response from AP %pM"
3024                                     " after %dms, disconnecting.\n",
3025                                     sdata->name,
3026                                     bssid, probe_wait_ms);
3027
3028                         ieee80211_sta_connection_lost(sdata, bssid,
3029                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
3030                 }
3031         }
3032
3033         mutex_unlock(&ifmgd->mtx);
3034
3035         mutex_lock(&local->mtx);
3036         ieee80211_recalc_idle(local);
3037         mutex_unlock(&local->mtx);
3038 }
3039
3040 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
3041 {
3042         struct ieee80211_sub_if_data *sdata =
3043                 (struct ieee80211_sub_if_data *) data;
3044         struct ieee80211_local *local = sdata->local;
3045
3046         if (local->quiescing)
3047                 return;
3048
3049         ieee80211_queue_work(&sdata->local->hw,
3050                              &sdata->u.mgd.beacon_connection_loss_work);
3051 }
3052
3053 static void ieee80211_sta_conn_mon_timer(unsigned long data)
3054 {
3055         struct ieee80211_sub_if_data *sdata =
3056                 (struct ieee80211_sub_if_data *) data;
3057         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3058         struct ieee80211_local *local = sdata->local;
3059
3060         if (local->quiescing)
3061                 return;
3062
3063         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
3064 }
3065
3066 static void ieee80211_sta_monitor_work(struct work_struct *work)
3067 {
3068         struct ieee80211_sub_if_data *sdata =
3069                 container_of(work, struct ieee80211_sub_if_data,
3070                              u.mgd.monitor_work);
3071
3072         ieee80211_mgd_probe_ap(sdata, false);
3073 }
3074
3075 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
3076 {
3077         u32 flags;
3078
3079         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3080                 __ieee80211_stop_poll(sdata);
3081
3082                 /* let's probe the connection once */
3083                 flags = sdata->local->hw.flags;
3084                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
3085                         ieee80211_queue_work(&sdata->local->hw,
3086                                              &sdata->u.mgd.monitor_work);
3087                 /* and do all the other regular work too */
3088                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3089         }
3090 }
3091
3092 #ifdef CONFIG_PM
3093 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
3094 {
3095         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3096
3097         /*
3098          * we need to use atomic bitops for the running bits
3099          * only because both timers might fire at the same
3100          * time -- the code here is properly synchronised.
3101          */
3102
3103         cancel_work_sync(&ifmgd->request_smps_work);
3104
3105         cancel_work_sync(&ifmgd->monitor_work);
3106         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
3107         cancel_work_sync(&ifmgd->csa_connection_drop_work);
3108         if (del_timer_sync(&ifmgd->timer))
3109                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
3110
3111         cancel_work_sync(&ifmgd->chswitch_work);
3112         if (del_timer_sync(&ifmgd->chswitch_timer))
3113                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
3114
3115         /* these will just be re-established on connection */
3116         del_timer_sync(&ifmgd->conn_mon_timer);
3117         del_timer_sync(&ifmgd->bcn_mon_timer);
3118 }
3119
3120 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3121 {
3122         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3123
3124         if (!ifmgd->associated)
3125                 return;
3126
3127         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3128                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3129                 mutex_lock(&ifmgd->mtx);
3130                 if (ifmgd->associated) {
3131                         mlme_dbg(sdata,
3132                                  "driver requested disconnect after resume\n");
3133                         ieee80211_sta_connection_lost(sdata,
3134                                 ifmgd->associated->bssid,
3135                                 WLAN_REASON_UNSPECIFIED);
3136                         mutex_unlock(&ifmgd->mtx);
3137                         return;
3138                 }
3139                 mutex_unlock(&ifmgd->mtx);
3140         }
3141
3142         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
3143                 add_timer(&ifmgd->timer);
3144         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
3145                 add_timer(&ifmgd->chswitch_timer);
3146         ieee80211_sta_reset_beacon_monitor(sdata);
3147
3148         mutex_lock(&sdata->local->mtx);
3149         ieee80211_restart_sta_timer(sdata);
3150         mutex_unlock(&sdata->local->mtx);
3151 }
3152 #endif
3153
3154 /* interface setup */
3155 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3156 {
3157         struct ieee80211_if_managed *ifmgd;
3158
3159         ifmgd = &sdata->u.mgd;
3160         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3161         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3162         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3163                   ieee80211_beacon_connection_loss_work);
3164         INIT_WORK(&ifmgd->csa_connection_drop_work,
3165                   ieee80211_csa_connection_drop_work);
3166         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3167         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3168                     (unsigned long) sdata);
3169         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3170                     (unsigned long) sdata);
3171         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3172                     (unsigned long) sdata);
3173         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3174                     (unsigned long) sdata);
3175
3176         ifmgd->flags = 0;
3177         ifmgd->powersave = sdata->wdev.ps;
3178         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3179         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3180
3181         mutex_init(&ifmgd->mtx);
3182
3183         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3184                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3185         else
3186                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3187 }
3188
3189 /* scan finished notification */
3190 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3191 {
3192         struct ieee80211_sub_if_data *sdata;
3193
3194         /* Restart STA timers */
3195         rcu_read_lock();
3196         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3197                 ieee80211_restart_sta_timer(sdata);
3198         rcu_read_unlock();
3199 }
3200
3201 int ieee80211_max_network_latency(struct notifier_block *nb,
3202                                   unsigned long data, void *dummy)
3203 {
3204         s32 latency_usec = (s32) data;
3205         struct ieee80211_local *local =
3206                 container_of(nb, struct ieee80211_local,
3207                              network_latency_notifier);
3208
3209         mutex_lock(&local->iflist_mtx);
3210         ieee80211_recalc_ps(local, latency_usec);
3211         mutex_unlock(&local->iflist_mtx);
3212
3213         return 0;
3214 }
3215
3216 static u32 chandef_downgrade(struct cfg80211_chan_def *c)
3217 {
3218         u32 ret;
3219         int tmp;
3220
3221         switch (c->width) {
3222         case NL80211_CHAN_WIDTH_20:
3223                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
3224                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3225                 break;
3226         case NL80211_CHAN_WIDTH_40:
3227                 c->width = NL80211_CHAN_WIDTH_20;
3228                 c->center_freq1 = c->chan->center_freq;
3229                 ret = IEEE80211_STA_DISABLE_40MHZ |
3230                       IEEE80211_STA_DISABLE_VHT;
3231                 break;
3232         case NL80211_CHAN_WIDTH_80:
3233                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
3234                 /* n_P40 */
3235                 tmp /= 2;
3236                 /* freq_P40 */
3237                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
3238                 c->width = NL80211_CHAN_WIDTH_40;
3239                 ret = IEEE80211_STA_DISABLE_VHT;
3240                 break;
3241         case NL80211_CHAN_WIDTH_80P80:
3242                 c->center_freq2 = 0;
3243                 c->width = NL80211_CHAN_WIDTH_80;
3244                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
3245                       IEEE80211_STA_DISABLE_160MHZ;
3246                 break;
3247         case NL80211_CHAN_WIDTH_160:
3248                 /* n_P20 */
3249                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
3250                 /* n_P80 */
3251                 tmp /= 4;
3252                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
3253                 c->width = NL80211_CHAN_WIDTH_80;
3254                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
3255                       IEEE80211_STA_DISABLE_160MHZ;
3256                 break;
3257         default:
3258         case NL80211_CHAN_WIDTH_20_NOHT:
3259                 WARN_ON_ONCE(1);
3260                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
3261                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3262                 break;
3263         }
3264
3265         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
3266
3267         return ret;
3268 }
3269
3270 static u32
3271 ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
3272                              struct ieee80211_supported_band *sband,
3273                              struct ieee80211_channel *channel,
3274                              const struct ieee80211_ht_operation *ht_oper,
3275                              const struct ieee80211_vht_operation *vht_oper,
3276                              struct cfg80211_chan_def *chandef)
3277 {
3278         struct cfg80211_chan_def vht_chandef;
3279         u32 ht_cfreq, ret;
3280
3281         chandef->chan = channel;
3282         chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
3283         chandef->center_freq1 = channel->center_freq;
3284         chandef->center_freq2 = 0;
3285
3286         if (!ht_oper || !sband->ht_cap.ht_supported) {
3287                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3288                 goto out;
3289         }
3290
3291         chandef->width = NL80211_CHAN_WIDTH_20;
3292
3293         ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3294                                                   channel->band);
3295         /* check that channel matches the right operating channel */
3296         if (channel->center_freq != ht_cfreq) {
3297                 /*
3298                  * It's possible that some APs are confused here;
3299                  * Netgear WNDR3700 sometimes reports 4 higher than
3300                  * the actual channel in association responses, but
3301                  * since we look at probe response/beacon data here
3302                  * it should be OK.
3303                  */
3304                 sdata_info(sdata,
3305                            "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3306                            channel->center_freq, ht_cfreq,
3307                            ht_oper->primary_chan, channel->band);
3308                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
3309                 goto out;
3310         }
3311
3312         /* check 40 MHz support, if we have it */
3313         if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3314                 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3315                 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3316                         chandef->width = NL80211_CHAN_WIDTH_40;
3317                         chandef->center_freq1 += 10;
3318                         break;
3319                 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3320                         chandef->width = NL80211_CHAN_WIDTH_40;
3321                         chandef->center_freq1 -= 10;
3322                         break;
3323                 }
3324         } else {
3325                 /* 40 MHz (and 80 MHz) must be supported for VHT */
3326                 ret = IEEE80211_STA_DISABLE_VHT;
3327                 goto out;
3328         }
3329
3330         if (!vht_oper || !sband->vht_cap.vht_supported) {
3331                 ret = IEEE80211_STA_DISABLE_VHT;
3332                 goto out;
3333         }
3334
3335         vht_chandef.chan = channel;
3336         vht_chandef.center_freq1 =
3337                 ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
3338                                                channel->band);
3339         vht_chandef.center_freq2 = 0;
3340
3341         if (vht_oper->center_freq_seg2_idx)
3342                 vht_chandef.center_freq2 =
3343                         ieee80211_channel_to_frequency(
3344                                 vht_oper->center_freq_seg2_idx,
3345                                 channel->band);
3346
3347         switch (vht_oper->chan_width) {
3348         case IEEE80211_VHT_CHANWIDTH_USE_HT:
3349                 vht_chandef.width = chandef->width;
3350                 break;
3351         case IEEE80211_VHT_CHANWIDTH_80MHZ:
3352                 vht_chandef.width = NL80211_CHAN_WIDTH_80;
3353                 break;
3354         case IEEE80211_VHT_CHANWIDTH_160MHZ:
3355                 vht_chandef.width = NL80211_CHAN_WIDTH_160;
3356                 break;
3357         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
3358                 vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
3359                 break;
3360         default:
3361                 sdata_info(sdata,
3362                            "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
3363                            vht_oper->chan_width);
3364                 ret = IEEE80211_STA_DISABLE_VHT;
3365                 goto out;
3366         }
3367
3368         if (!cfg80211_chandef_valid(&vht_chandef)) {
3369                 sdata_info(sdata,
3370                            "AP VHT information is invalid, disable VHT\n");
3371                 ret = IEEE80211_STA_DISABLE_VHT;
3372                 goto out;
3373         }
3374
3375         if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
3376                 ret = 0;
3377                 goto out;
3378         }
3379
3380         if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
3381                 sdata_info(sdata,
3382                            "AP VHT information doesn't match HT, disable VHT\n");
3383                 ret = IEEE80211_STA_DISABLE_VHT;
3384                 goto out;
3385         }
3386
3387         *chandef = vht_chandef;
3388
3389         ret = 0;
3390
3391         while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
3392                                         IEEE80211_CHAN_DISABLED)) {
3393                 if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
3394                         ret = IEEE80211_STA_DISABLE_HT |
3395                               IEEE80211_STA_DISABLE_VHT;
3396                         goto out;
3397                 }
3398
3399                 ret = chandef_downgrade(chandef);
3400         }
3401
3402         if (chandef->width != vht_chandef.width)
3403                 sdata_info(sdata,
3404                            "local regulatory prevented using AP HT/VHT configuration, downgraded\n");
3405
3406 out:
3407         WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
3408         return ret;
3409 }
3410
3411 static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
3412                                      struct cfg80211_bss *cbss)
3413 {
3414         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3415         const u8 *ht_cap_ie, *vht_cap_ie;
3416         const struct ieee80211_ht_cap *ht_cap;
3417         const struct ieee80211_vht_cap *vht_cap;
3418         u8 chains = 1;
3419
3420         if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
3421                 return chains;
3422
3423         ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
3424         if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
3425                 ht_cap = (void *)(ht_cap_ie + 2);
3426                 chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
3427                 /*
3428                  * TODO: use "Tx Maximum Number Spatial Streams Supported" and
3429                  *       "Tx Unequal Modulation Supported" fields.
3430                  */
3431         }
3432
3433         if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
3434                 return chains;
3435
3436         vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
3437         if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
3438                 u8 nss;
3439                 u16 tx_mcs_map;
3440
3441                 vht_cap = (void *)(vht_cap_ie + 2);
3442                 tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
3443                 for (nss = 8; nss > 0; nss--) {
3444                         if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
3445                                         IEEE80211_VHT_MCS_NOT_SUPPORTED)
3446                                 break;
3447                 }
3448                 /* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
3449                 chains = max(chains, nss);
3450         }
3451
3452         return chains;
3453 }
3454
3455 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3456                                   struct cfg80211_bss *cbss)
3457 {
3458         struct ieee80211_local *local = sdata->local;
3459         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3460         const struct ieee80211_ht_operation *ht_oper = NULL;
3461         const struct ieee80211_vht_operation *vht_oper = NULL;
3462         struct ieee80211_supported_band *sband;
3463         struct cfg80211_chan_def chandef;
3464         int ret;
3465
3466         sband = local->hw.wiphy->bands[cbss->channel->band];
3467
3468         ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
3469                           IEEE80211_STA_DISABLE_80P80MHZ |
3470                           IEEE80211_STA_DISABLE_160MHZ);
3471
3472         rcu_read_lock();
3473
3474         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
3475             sband->ht_cap.ht_supported) {
3476                 const u8 *ht_oper_ie;
3477
3478                 ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3479                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3480                         ht_oper = (void *)(ht_oper_ie + 2);
3481         }
3482
3483         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
3484             sband->vht_cap.vht_supported) {
3485                 const u8 *vht_oper_ie;
3486
3487                 vht_oper_ie = ieee80211_bss_get_ie(cbss,
3488                                                    WLAN_EID_VHT_OPERATION);
3489                 if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
3490                         vht_oper = (void *)(vht_oper_ie + 2);
3491                 if (vht_oper && !ht_oper) {
3492                         vht_oper = NULL;
3493                         sdata_info(sdata,
3494                                    "AP advertised VHT without HT, disabling both\n");
3495                         sdata->flags |= IEEE80211_STA_DISABLE_HT;
3496                         sdata->flags |= IEEE80211_STA_DISABLE_VHT;
3497                 }
3498         }
3499
3500         ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
3501                                                      cbss->channel,
3502                                                      ht_oper, vht_oper,
3503                                                      &chandef);
3504
3505         sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
3506                                       local->rx_chains);
3507
3508         rcu_read_unlock();
3509
3510         /* will change later if needed */
3511         sdata->smps_mode = IEEE80211_SMPS_OFF;
3512
3513         /*
3514          * If this fails (possibly due to channel context sharing
3515          * on incompatible channels, e.g. 80+80 and 160 sharing the
3516          * same control channel) try to use a smaller bandwidth.
3517          */
3518         ret = ieee80211_vif_use_channel(sdata, &chandef,
3519                                         IEEE80211_CHANCTX_SHARED);
3520         while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT)
3521                 ifmgd->flags |= chandef_downgrade(&chandef);
3522         return ret;
3523 }
3524
3525 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3526                                      struct cfg80211_bss *cbss, bool assoc)
3527 {
3528         struct ieee80211_local *local = sdata->local;
3529         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3530         struct ieee80211_bss *bss = (void *)cbss->priv;
3531         struct sta_info *new_sta = NULL;
3532         bool have_sta = false;
3533         int err;
3534
3535         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3536                 return -EINVAL;
3537
3538         if (assoc) {
3539                 rcu_read_lock();
3540                 have_sta = sta_info_get(sdata, cbss->bssid);
3541                 rcu_read_unlock();
3542         }
3543
3544         if (!have_sta) {
3545                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3546                 if (!new_sta)
3547                         return -ENOMEM;
3548         }
3549
3550         mutex_lock(&local->mtx);
3551         ieee80211_recalc_idle(sdata->local);
3552         mutex_unlock(&local->mtx);
3553
3554         if (new_sta) {
3555                 u32 rates = 0, basic_rates = 0;
3556                 bool have_higher_than_11mbit;
3557                 int min_rate = INT_MAX, min_rate_index = -1;
3558                 struct ieee80211_supported_band *sband;
3559
3560                 sband = local->hw.wiphy->bands[cbss->channel->band];
3561
3562                 err = ieee80211_prep_channel(sdata, cbss);
3563                 if (err) {
3564                         sta_info_free(local, new_sta);
3565                         return err;
3566                 }
3567
3568                 ieee80211_get_rates(sband, bss->supp_rates,
3569                                     bss->supp_rates_len,
3570                                     &rates, &basic_rates,
3571                                     &have_higher_than_11mbit,
3572                                     &min_rate, &min_rate_index);
3573
3574                 /*
3575                  * This used to be a workaround for basic rates missing
3576                  * in the association response frame. Now that we no
3577                  * longer use the basic rates from there, it probably
3578                  * doesn't happen any more, but keep the workaround so
3579                  * in case some *other* APs are buggy in different ways
3580                  * we can connect -- with a warning.
3581                  */
3582                 if (!basic_rates && min_rate_index >= 0) {
3583                         sdata_info(sdata,
3584                                    "No basic rates, using min rate instead\n");
3585                         basic_rates = BIT(min_rate_index);
3586                 }
3587
3588                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3589                 sdata->vif.bss_conf.basic_rates = basic_rates;
3590
3591                 /* cf. IEEE 802.11 9.2.12 */
3592                 if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3593                     have_higher_than_11mbit)
3594                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3595                 else
3596                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3597
3598                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3599
3600                 /* set timing information */
3601                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3602                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3603                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3604
3605                 /* tell driver about BSSID, basic rates and timing */
3606                 ieee80211_bss_info_change_notify(sdata,
3607                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3608                         BSS_CHANGED_BEACON_INT);
3609
3610                 if (assoc)
3611                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3612
3613                 err = sta_info_insert(new_sta);
3614                 new_sta = NULL;
3615                 if (err) {
3616                         sdata_info(sdata,
3617                                    "failed to insert STA entry for the AP (error %d)\n",
3618                                    err);
3619                         return err;
3620                 }
3621         } else
3622                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3623
3624         return 0;
3625 }
3626
3627 /* config hooks */
3628 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3629                        struct cfg80211_auth_request *req)
3630 {
3631         struct ieee80211_local *local = sdata->local;
3632         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3633         struct ieee80211_mgd_auth_data *auth_data;
3634         u16 auth_alg;
3635         int err;
3636
3637         /* prepare auth data structure */
3638
3639         switch (req->auth_type) {
3640         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3641                 auth_alg = WLAN_AUTH_OPEN;
3642                 break;
3643         case NL80211_AUTHTYPE_SHARED_KEY:
3644                 if (IS_ERR(local->wep_tx_tfm))
3645                         return -EOPNOTSUPP;
3646                 auth_alg = WLAN_AUTH_SHARED_KEY;
3647                 break;
3648         case NL80211_AUTHTYPE_FT:
3649                 auth_alg = WLAN_AUTH_FT;
3650                 break;
3651         case NL80211_AUTHTYPE_NETWORK_EAP:
3652                 auth_alg = WLAN_AUTH_LEAP;
3653                 break;
3654         case NL80211_AUTHTYPE_SAE:
3655                 auth_alg = WLAN_AUTH_SAE;
3656                 break;
3657         default:
3658                 return -EOPNOTSUPP;
3659         }
3660
3661         auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
3662                             req->ie_len, GFP_KERNEL);
3663         if (!auth_data)
3664                 return -ENOMEM;
3665
3666         auth_data->bss = req->bss;
3667
3668         if (req->sae_data_len >= 4) {
3669                 __le16 *pos = (__le16 *) req->sae_data;
3670                 auth_data->sae_trans = le16_to_cpu(pos[0]);
3671                 auth_data->sae_status = le16_to_cpu(pos[1]);
3672                 memcpy(auth_data->data, req->sae_data + 4,
3673                        req->sae_data_len - 4);
3674                 auth_data->data_len += req->sae_data_len - 4;
3675         }
3676
3677         if (req->ie && req->ie_len) {
3678                 memcpy(&auth_data->data[auth_data->data_len],
3679                        req->ie, req->ie_len);
3680                 auth_data->data_len += req->ie_len;
3681         }
3682
3683         if (req->key && req->key_len) {
3684                 auth_data->key_len = req->key_len;
3685                 auth_data->key_idx = req->key_idx;
3686                 memcpy(auth_data->key, req->key, req->key_len);
3687         }
3688
3689         auth_data->algorithm = auth_alg;
3690
3691         /* try to authenticate/probe */
3692
3693         mutex_lock(&ifmgd->mtx);
3694
3695         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3696             ifmgd->assoc_data) {
3697                 err = -EBUSY;
3698                 goto err_free;
3699         }
3700
3701         if (ifmgd->auth_data)
3702                 ieee80211_destroy_auth_data(sdata, false);
3703
3704         /* prep auth_data so we don't go into idle on disassoc */
3705         ifmgd->auth_data = auth_data;
3706
3707         if (ifmgd->associated)
3708                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3709
3710         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3711
3712         err = ieee80211_prep_connection(sdata, req->bss, false);
3713         if (err)
3714                 goto err_clear;
3715
3716         err = ieee80211_probe_auth(sdata);
3717         if (err) {
3718                 sta_info_destroy_addr(sdata, req->bss->bssid);
3719                 goto err_clear;
3720         }
3721
3722         /* hold our own reference */
3723         cfg80211_ref_bss(auth_data->bss);
3724         err = 0;
3725         goto out_unlock;
3726
3727  err_clear:
3728         memset(ifmgd->bssid, 0, ETH_ALEN);
3729         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3730         ifmgd->auth_data = NULL;
3731  err_free:
3732         kfree(auth_data);
3733  out_unlock:
3734         mutex_unlock(&ifmgd->mtx);
3735
3736         return err;
3737 }
3738
3739 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3740                         struct cfg80211_assoc_request *req)
3741 {
3742         struct ieee80211_local *local = sdata->local;
3743         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3744         struct ieee80211_bss *bss = (void *)req->bss->priv;
3745         struct ieee80211_mgd_assoc_data *assoc_data;
3746         struct ieee80211_supported_band *sband;
3747         const u8 *ssidie, *ht_ie;
3748         int i, err;
3749
3750         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3751         if (!assoc_data)
3752                 return -ENOMEM;
3753
3754         rcu_read_lock();
3755         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3756         if (!ssidie) {
3757                 rcu_read_unlock();
3758                 kfree(assoc_data);
3759                 return -EINVAL;
3760         }
3761         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3762         assoc_data->ssid_len = ssidie[1];
3763         rcu_read_unlock();
3764
3765         mutex_lock(&ifmgd->mtx);
3766
3767         if (ifmgd->associated)
3768                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3769
3770         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3771                 err = -EBUSY;
3772                 goto err_free;
3773         }
3774
3775         if (ifmgd->assoc_data) {
3776                 err = -EBUSY;
3777                 goto err_free;
3778         }
3779
3780         if (ifmgd->auth_data) {
3781                 bool match;
3782
3783                 /* keep sta info, bssid if matching */
3784                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3785                 ieee80211_destroy_auth_data(sdata, match);
3786         }
3787
3788         /* prepare assoc data */
3789
3790         ifmgd->beacon_crc_valid = false;
3791
3792         /*
3793          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3794          * We still associate in non-HT mode (11a/b/g) if any one of these
3795          * ciphers is configured as pairwise.
3796          * We can set this to true for non-11n hardware, that'll be checked
3797          * separately along with the peer capabilities.
3798          */
3799         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3800                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3801                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3802                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3803                         ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3804                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3805                         netdev_info(sdata->dev,
3806                                     "disabling HT/VHT due to WEP/TKIP use\n");
3807                 }
3808         }
3809
3810         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3811                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3812                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3813         }
3814
3815         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3816         sband = local->hw.wiphy->bands[req->bss->channel->band];
3817         if (!sband->ht_cap.ht_supported ||
3818             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3819                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3820                 if (!bss->wmm_used)
3821                         netdev_info(sdata->dev,
3822                                     "disabling HT as WMM/QoS is not supported by the AP\n");
3823         }
3824
3825         /* disable VHT if we don't support it or the AP doesn't use WMM */
3826         if (!sband->vht_cap.vht_supported ||
3827             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3828                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3829                 if (!bss->wmm_used)
3830                         netdev_info(sdata->dev,
3831                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
3832         }
3833
3834         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3835         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3836                sizeof(ifmgd->ht_capa_mask));
3837
3838         if (req->ie && req->ie_len) {
3839                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3840                 assoc_data->ie_len = req->ie_len;
3841         }
3842
3843         assoc_data->bss = req->bss;
3844
3845         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3846                 if (ifmgd->powersave)
3847                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
3848                 else
3849                         sdata->smps_mode = IEEE80211_SMPS_OFF;
3850         } else
3851                 sdata->smps_mode = ifmgd->req_smps;
3852
3853         assoc_data->capability = req->bss->capability;
3854         assoc_data->wmm = bss->wmm_used &&
3855                           (local->hw.queues >= IEEE80211_NUM_ACS);
3856         assoc_data->supp_rates = bss->supp_rates;
3857         assoc_data->supp_rates_len = bss->supp_rates_len;
3858
3859         rcu_read_lock();
3860         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3861         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3862                 assoc_data->ap_ht_param =
3863                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3864         else
3865                 ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
3866         rcu_read_unlock();
3867
3868         if (bss->wmm_used && bss->uapsd_supported &&
3869             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3870                 assoc_data->uapsd = true;
3871                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3872         } else {
3873                 assoc_data->uapsd = false;
3874                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3875         }
3876
3877         if (req->prev_bssid)
3878                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3879
3880         if (req->use_mfp) {
3881                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3882                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3883         } else {
3884                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3885                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3886         }
3887
3888         if (req->crypto.control_port)
3889                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3890         else
3891                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3892
3893         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3894         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3895
3896         /* kick off associate process */
3897
3898         ifmgd->assoc_data = assoc_data;
3899
3900         err = ieee80211_prep_connection(sdata, req->bss, true);
3901         if (err)
3902                 goto err_clear;
3903
3904         if (!bss->dtim_period &&
3905             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3906                 /*
3907                  * Wait up to one beacon interval ...
3908                  * should this be more if we miss one?
3909                  */
3910                 sdata_info(sdata, "waiting for beacon from %pM\n",
3911                            ifmgd->bssid);
3912                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3913         } else {
3914                 assoc_data->have_beacon = true;
3915                 assoc_data->sent_assoc = false;
3916                 assoc_data->timeout = jiffies;
3917         }
3918         run_again(ifmgd, assoc_data->timeout);
3919
3920         if (bss->corrupt_data) {
3921                 char *corrupt_type = "data";
3922                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3923                         if (bss->corrupt_data &
3924                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3925                                 corrupt_type = "beacon and probe response";
3926                         else
3927                                 corrupt_type = "beacon";
3928                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3929                         corrupt_type = "probe response";
3930                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3931                            corrupt_type);
3932         }
3933
3934         err = 0;
3935         goto out;
3936  err_clear:
3937         memset(ifmgd->bssid, 0, ETH_ALEN);
3938         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3939         ifmgd->assoc_data = NULL;
3940  err_free:
3941         kfree(assoc_data);
3942  out:
3943         mutex_unlock(&ifmgd->mtx);
3944
3945         return err;
3946 }
3947
3948 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3949                          struct cfg80211_deauth_request *req)
3950 {
3951         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3952         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3953         bool tx = !req->local_state_change;
3954         bool sent_frame = false;
3955
3956         mutex_lock(&ifmgd->mtx);
3957
3958         sdata_info(sdata,
3959                    "deauthenticating from %pM by local choice (reason=%d)\n",
3960                    req->bssid, req->reason_code);
3961
3962         if (ifmgd->auth_data) {
3963                 drv_mgd_prepare_tx(sdata->local, sdata);
3964                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3965                                                IEEE80211_STYPE_DEAUTH,
3966                                                req->reason_code, tx,
3967                                                frame_buf);
3968                 ieee80211_destroy_auth_data(sdata, false);
3969                 mutex_unlock(&ifmgd->mtx);
3970
3971                 sent_frame = tx;
3972                 goto out;
3973         }
3974
3975         if (ifmgd->associated &&
3976             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
3977                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3978                                        req->reason_code, tx, frame_buf);
3979                 sent_frame = tx;
3980         }
3981         mutex_unlock(&ifmgd->mtx);
3982
3983  out:
3984         mutex_lock(&sdata->local->mtx);
3985         ieee80211_recalc_idle(sdata->local);
3986         mutex_unlock(&sdata->local->mtx);
3987
3988         if (sent_frame)
3989                 __cfg80211_send_deauth(sdata->dev, frame_buf,
3990                                        IEEE80211_DEAUTH_FRAME_LEN);
3991
3992         return 0;
3993 }
3994
3995 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3996                            struct cfg80211_disassoc_request *req)
3997 {
3998         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3999         u8 bssid[ETH_ALEN];
4000         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4001
4002         mutex_lock(&ifmgd->mtx);
4003
4004         /*
4005          * cfg80211 should catch this ... but it's racy since
4006          * we can receive a disassoc frame, process it, hand it
4007          * to cfg80211 while that's in a locked section already
4008          * trying to tell us that the user wants to disconnect.
4009          */
4010         if (ifmgd->associated != req->bss) {
4011                 mutex_unlock(&ifmgd->mtx);
4012                 return -ENOLINK;
4013         }
4014
4015         sdata_info(sdata,
4016                    "disassociating from %pM by local choice (reason=%d)\n",
4017                    req->bss->bssid, req->reason_code);
4018
4019         memcpy(bssid, req->bss->bssid, ETH_ALEN);
4020         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
4021                                req->reason_code, !req->local_state_change,
4022                                frame_buf);
4023         mutex_unlock(&ifmgd->mtx);
4024
4025         __cfg80211_send_disassoc(sdata->dev, frame_buf,
4026                                  IEEE80211_DEAUTH_FRAME_LEN);
4027
4028         mutex_lock(&sdata->local->mtx);
4029         ieee80211_recalc_idle(sdata->local);
4030         mutex_unlock(&sdata->local->mtx);
4031
4032         return 0;
4033 }
4034
4035 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4036 {
4037         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4038
4039         mutex_lock(&ifmgd->mtx);
4040         if (ifmgd->assoc_data)
4041                 ieee80211_destroy_assoc_data(sdata, false);
4042         if (ifmgd->auth_data)
4043                 ieee80211_destroy_auth_data(sdata, false);
4044         del_timer_sync(&ifmgd->timer);
4045         mutex_unlock(&ifmgd->mtx);
4046 }
4047
4048 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
4049                                enum nl80211_cqm_rssi_threshold_event rssi_event,
4050                                gfp_t gfp)
4051 {
4052         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4053
4054         trace_api_cqm_rssi_notify(sdata, rssi_event);
4055
4056         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
4057 }
4058 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);