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 #define DEAUTH_DISASSOC_LEN     (24 /* hdr */ + 2 /* reason */)
  92
  93 /*
  94  * All cfg80211 functions have to be called outside a locked
  95  * section so that they can acquire a lock themselves... This
  96  * is much simpler than queuing up things in cfg80211, but we
  97  * do need some indirection for that here.
  98  */
  99 enum rx_mgmt_action {
 100         /* no action required */
 101         RX_MGMT_NONE,
 102
 103         /* caller must call cfg80211_send_deauth() */
 104         RX_MGMT_CFG80211_DEAUTH,
 105
 106         /* caller must call cfg80211_send_disassoc() */
 107         RX_MGMT_CFG80211_DISASSOC,
 108
 109         /* caller must call cfg80211_send_rx_auth() */
 110         RX_MGMT_CFG80211_RX_AUTH,
 111
 112         /* caller must call cfg80211_send_rx_assoc() */
 113         RX_MGMT_CFG80211_RX_ASSOC,
 114
 115         /* caller must call cfg80211_send_assoc_timeout() */
 116         RX_MGMT_CFG80211_ASSOC_TIMEOUT,
 117 };
 118
 119 /* utils */
 120 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 121 {
 122         lockdep_assert_held(&ifmgd->mtx);
 123 }
 124
 125 /*
 126  * We can have multiple work items (and connection probing)
 127  * scheduling this timer, but we need to take care to only
 128  * reschedule it when it should fire _earlier_ than it was
 129  * asked for before, or if it's not pending right now. This
 130  * function ensures that. Note that it then is required to
 131  * run this function for all timeouts after the first one
 132  * has happened -- the work that runs from this timer will
 133  * do that.
 134  */
 135 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
 136 {
 137         ASSERT_MGD_MTX(ifmgd);
 138
 139         if (!timer_pending(&ifmgd->timer) ||
 140             time_before(timeout, ifmgd->timer.expires))
 141                 mod_timer(&ifmgd->timer, timeout);
 142 }
 143
 144 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 145 {
 146         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 147                 return;
 148
 149         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 150                 return;
 151
 152         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 153                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 154 }
 155
 156 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 157 {
 158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 159
 160         if (unlikely(!sdata->u.mgd.associated))
 161                 return;
 162
 163         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 164                 return;
 165
 166         mod_timer(&sdata->u.mgd.conn_mon_timer,
 167                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 168
 169         ifmgd->probe_send_count = 0;
 170 }
 171
 172 static int ecw2cw(int ecw)
 173 {
 174         return (1 << ecw) - 1;
 175 }
 176
 177 static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
 178                                   struct ieee80211_ht_operation *ht_oper,
 179                                   const u8 *bssid, bool reconfig)
 180 {
 181         struct ieee80211_local *local = sdata->local;
 182         struct ieee80211_supported_band *sband;
 183         struct sta_info *sta;
 184         u32 changed = 0;
 185         u16 ht_opmode;
 186         bool disable_40 = false;
 187
 188         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 189
 190         switch (sdata->vif.bss_conf.channel_type) {
 191         case NL80211_CHAN_HT40PLUS:
 192                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
 193                         disable_40 = true;
 194                 break;
 195         case NL80211_CHAN_HT40MINUS:
 196                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
 197                         disable_40 = true;
 198                 break;
 199         default:
 200                 break;
 201         }
 202
 203         /* This can change during the lifetime of the BSS */
 204         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 205                 disable_40 = true;
 206
 207         mutex_lock(&local->sta_mtx);
 208         sta = sta_info_get(sdata, bssid);
 209
 210         WARN_ON_ONCE(!sta);
 211
 212         if (sta && !sta->supports_40mhz)
 213                 disable_40 = true;
 214
 215         if (sta && (!reconfig ||
 216                     (disable_40 != !(sta->sta.ht_cap.cap &
 217                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 218
 219                 if (disable_40)
 220                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 221                 else
 222                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 223
 224                 rate_control_rate_update(local, sband, sta,
 225                                          IEEE80211_RC_BW_CHANGED);
 226         }
 227         mutex_unlock(&local->sta_mtx);
 228
 229         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 230
 231         /* if bss configuration changed store the new one */
 232         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 233                 changed |= BSS_CHANGED_HT;
 234                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 235         }
 236
 237         return changed;
 238 }
 239
 240 /* frame sending functions */
 241
 242 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 243                                       struct ieee80211_supported_band *sband,
 244                                       u32 *rates)
 245 {
 246         int i, j, count;
 247         *rates = 0;
 248         count = 0;
 249         for (i = 0; i < supp_rates_len; i++) {
 250                 int rate = (supp_rates[i] & 0x7F) * 5;
 251
 252                 for (j = 0; j < sband->n_bitrates; j++)
 253                         if (sband->bitrates[j].bitrate == rate) {
 254                                 *rates |= BIT(j);
 255                                 count++;
 256                                 break;
 257                         }
 258         }
 259
 260         return count;
 261 }
 262
 263 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 264                                 struct sk_buff *skb, u8 ap_ht_param,
 265                                 struct ieee80211_supported_band *sband,
 266                                 struct ieee80211_channel *channel,
 267                                 enum ieee80211_smps_mode smps)
 268 {
 269         u8 *pos;
 270         u32 flags = channel->flags;
 271         u16 cap;
 272         struct ieee80211_sta_ht_cap ht_cap;
 273
 274         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 275
 276         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 277         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 278
 279         /* determine capability flags */
 280         cap = ht_cap.cap;
 281
 282         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 283         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 284                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 285                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 286                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 287                 }
 288                 break;
 289         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 290                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 291                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 292                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 293                 }
 294                 break;
 295         }
 296
 297         /*
 298          * If 40 MHz was disabled associate as though we weren't
 299          * capable of 40 MHz -- some broken APs will never fall
 300          * back to trying to transmit in 20 MHz.
 301          */
 302         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 303                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 304                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 305         }
 306
 307         /* set SM PS mode properly */
 308         cap &= ~IEEE80211_HT_CAP_SM_PS;
 309         switch (smps) {
 310         case IEEE80211_SMPS_AUTOMATIC:
 311         case IEEE80211_SMPS_NUM_MODES:
 312                 WARN_ON(1);
 313         case IEEE80211_SMPS_OFF:
 314                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 315                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 316                 break;
 317         case IEEE80211_SMPS_STATIC:
 318                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 319                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 320                 break;
 321         case IEEE80211_SMPS_DYNAMIC:
 322                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 323                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 324                 break;
 325         }
 326
 327         /* reserve and fill IE */
 328         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 329         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 330 }
 331
 332 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 333                                  struct sk_buff *skb,
 334                                  struct ieee80211_supported_band *sband)
 335 {
 336         u8 *pos;
 337         u32 cap;
 338         struct ieee80211_sta_vht_cap vht_cap;
 339
 340         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 341
 342         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 343
 344         /* determine capability flags */
 345         cap = vht_cap.cap;
 346
 347         /* reserve and fill IE */
 348         pos = skb_put(skb, sizeof(struct ieee80211_vht_capabilities) + 2);
 349         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 350 }
 351
 352 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 353 {
 354         struct ieee80211_local *local = sdata->local;
 355         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 356         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 357         struct sk_buff *skb;
 358         struct ieee80211_mgmt *mgmt;
 359         u8 *pos, qos_info;
 360         size_t offset = 0, noffset;
 361         int i, count, rates_len, supp_rates_len;
 362         u16 capab;
 363         struct ieee80211_supported_band *sband;
 364         u32 rates = 0;
 365
 366         lockdep_assert_held(&ifmgd->mtx);
 367
 368         sband = local->hw.wiphy->bands[local->oper_channel->band];
 369
 370         if (assoc_data->supp_rates_len) {
 371                 /*
 372                  * Get all rates supported by the device and the AP as
 373                  * some APs don't like getting a superset of their rates
 374                  * in the association request (e.g. D-Link DAP 1353 in
 375                  * b-only mode)...
 376                  */
 377                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 378                                                        assoc_data->supp_rates_len,
 379                                                        sband, &rates);
 380         } else {
 381                 /*
 382                  * In case AP not provide any supported rates information
 383                  * before association, we send information element(s) with
 384                  * all rates that we support.
 385                  */
 386                 rates = ~0;
 387                 rates_len = sband->n_bitrates;
 388         }
 389
 390         skb = alloc_skb(local->hw.extra_tx_headroom +
 391                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 392                         2 + assoc_data->ssid_len + /* SSID */
 393                         4 + rates_len + /* (extended) rates */
 394                         4 + /* power capability */
 395                         2 + 2 * sband->n_channels + /* supported channels */
 396                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 397                         2 + sizeof(struct ieee80211_vht_capabilities) + /* VHT */
 398                         assoc_data->ie_len + /* extra IEs */
 399                         9, /* WMM */
 400                         GFP_KERNEL);
 401         if (!skb)
 402                 return;
 403
 404         skb_reserve(skb, local->hw.extra_tx_headroom);
 405
 406         capab = WLAN_CAPABILITY_ESS;
 407
 408         if (sband->band == IEEE80211_BAND_2GHZ) {
 409                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 410                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 411                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 412                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 413         }
 414
 415         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 416                 capab |= WLAN_CAPABILITY_PRIVACY;
 417
 418         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 419             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 420                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 421
 422         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 423         memset(mgmt, 0, 24);
 424         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 425         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 426         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 427
 428         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 429                 skb_put(skb, 10);
 430                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 431                                                   IEEE80211_STYPE_REASSOC_REQ);
 432                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 433                 mgmt->u.reassoc_req.listen_interval =
 434                                 cpu_to_le16(local->hw.conf.listen_interval);
 435                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 436                        ETH_ALEN);
 437         } else {
 438                 skb_put(skb, 4);
 439                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 440                                                   IEEE80211_STYPE_ASSOC_REQ);
 441                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 442                 mgmt->u.assoc_req.listen_interval =
 443                                 cpu_to_le16(local->hw.conf.listen_interval);
 444         }
 445
 446         /* SSID */
 447         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 448         *pos++ = WLAN_EID_SSID;
 449         *pos++ = assoc_data->ssid_len;
 450         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 451
 452         /* add all rates which were marked to be used above */
 453         supp_rates_len = rates_len;
 454         if (supp_rates_len > 8)
 455                 supp_rates_len = 8;
 456
 457         pos = skb_put(skb, supp_rates_len + 2);
 458         *pos++ = WLAN_EID_SUPP_RATES;
 459         *pos++ = supp_rates_len;
 460
 461         count = 0;
 462         for (i = 0; i < sband->n_bitrates; i++) {
 463                 if (BIT(i) & rates) {
 464                         int rate = sband->bitrates[i].bitrate;
 465                         *pos++ = (u8) (rate / 5);
 466                         if (++count == 8)
 467                                 break;
 468                 }
 469         }
 470
 471         if (rates_len > count) {
 472                 pos = skb_put(skb, rates_len - count + 2);
 473                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 474                 *pos++ = rates_len - count;
 475
 476                 for (i++; i < sband->n_bitrates; i++) {
 477                         if (BIT(i) & rates) {
 478                                 int rate = sband->bitrates[i].bitrate;
 479                                 *pos++ = (u8) (rate / 5);
 480                         }
 481                 }
 482         }
 483
 484         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 485                 /* 1. power capabilities */
 486                 pos = skb_put(skb, 4);
 487                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 488                 *pos++ = 2;
 489                 *pos++ = 0; /* min tx power */
 490                 *pos++ = local->oper_channel->max_power; /* max tx power */
 491
 492                 /* 2. supported channels */
 493                 /* TODO: get this in reg domain format */
 494                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 495                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 496                 *pos++ = 2 * sband->n_channels;
 497                 for (i = 0; i < sband->n_channels; i++) {
 498                         *pos++ = ieee80211_frequency_to_channel(
 499                                         sband->channels[i].center_freq);
 500                         *pos++ = 1; /* one channel in the subband*/
 501                 }
 502         }
 503
 504         /* if present, add any custom IEs that go before HT */
 505         if (assoc_data->ie_len && assoc_data->ie) {
 506                 static const u8 before_ht[] = {
 507                         WLAN_EID_SSID,
 508                         WLAN_EID_SUPP_RATES,
 509                         WLAN_EID_EXT_SUPP_RATES,
 510                         WLAN_EID_PWR_CAPABILITY,
 511                         WLAN_EID_SUPPORTED_CHANNELS,
 512                         WLAN_EID_RSN,
 513                         WLAN_EID_QOS_CAPA,
 514                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 515                         WLAN_EID_MOBILITY_DOMAIN,
 516                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 517                 };
 518                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 519                                              before_ht, ARRAY_SIZE(before_ht),
 520                                              offset);
 521                 pos = skb_put(skb, noffset - offset);
 522                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 523                 offset = noffset;
 524         }
 525
 526         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 527                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 528                                     sband, local->oper_channel, ifmgd->ap_smps);
 529
 530         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 531                 ieee80211_add_vht_ie(sdata, skb, sband);
 532
 533         /* if present, add any custom non-vendor IEs that go after HT */
 534         if (assoc_data->ie_len && assoc_data->ie) {
 535                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 536                                                     assoc_data->ie_len,
 537                                                     offset);
 538                 pos = skb_put(skb, noffset - offset);
 539                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 540                 offset = noffset;
 541         }
 542
 543         if (assoc_data->wmm) {
 544                 if (assoc_data->uapsd) {
 545                         qos_info = ifmgd->uapsd_queues;
 546                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 547                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 548                 } else {
 549                         qos_info = 0;
 550                 }
 551
 552                 pos = skb_put(skb, 9);
 553                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 554                 *pos++ = 7; /* len */
 555                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 556                 *pos++ = 0x50;
 557                 *pos++ = 0xf2;
 558                 *pos++ = 2; /* WME */
 559                 *pos++ = 0; /* WME info */
 560                 *pos++ = 1; /* WME ver */
 561                 *pos++ = qos_info;
 562         }
 563
 564         /* add any remaining custom (i.e. vendor specific here) IEs */
 565         if (assoc_data->ie_len && assoc_data->ie) {
 566                 noffset = assoc_data->ie_len;
 567                 pos = skb_put(skb, noffset - offset);
 568                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 569         }
 570
 571         drv_mgd_prepare_tx(local, sdata);
 572
 573         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 574         ieee80211_tx_skb(sdata, skb);
 575 }
 576
 577 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 578                                            const u8 *bssid, u16 stype,
 579                                            u16 reason, bool send_frame,
 580                                            u8 *frame_buf)
 581 {
 582         struct ieee80211_local *local = sdata->local;
 583         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 584         struct sk_buff *skb;
 585         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 586
 587         /* build frame */
 588         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 589         mgmt->duration = 0; /* initialize only */
 590         mgmt->seq_ctrl = 0; /* initialize only */
 591         memcpy(mgmt->da, bssid, ETH_ALEN);
 592         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 593         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 594         /* u.deauth.reason_code == u.disassoc.reason_code */
 595         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 596
 597         if (send_frame) {
 598                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 599                                     DEAUTH_DISASSOC_LEN);
 600                 if (!skb)
 601                         return;
 602
 603                 skb_reserve(skb, local->hw.extra_tx_headroom);
 604
 605                 /* copy in frame */
 606                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 607                        mgmt, DEAUTH_DISASSOC_LEN);
 608
 609                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 610                         IEEE80211_SKB_CB(skb)->flags |=
 611                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
 612
 613                 ieee80211_tx_skb(sdata, skb);
 614         }
 615 }
 616
 617 void ieee80211_send_pspoll(struct ieee80211_local *local,
 618                            struct ieee80211_sub_if_data *sdata)
 619 {
 620         struct ieee80211_pspoll *pspoll;
 621         struct sk_buff *skb;
 622
 623         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 624         if (!skb)
 625                 return;
 626
 627         pspoll = (struct ieee80211_pspoll *) skb->data;
 628         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 629
 630         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 631         ieee80211_tx_skb(sdata, skb);
 632 }
 633
 634 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 635                              struct ieee80211_sub_if_data *sdata,
 636                              int powersave)
 637 {
 638         struct sk_buff *skb;
 639         struct ieee80211_hdr_3addr *nullfunc;
 640         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 641
 642         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 643         if (!skb)
 644                 return;
 645
 646         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 647         if (powersave)
 648                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 649
 650         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 651         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 652                             IEEE80211_STA_CONNECTION_POLL))
 653                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 654
 655         ieee80211_tx_skb(sdata, skb);
 656 }
 657
 658 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 659                                           struct ieee80211_sub_if_data *sdata)
 660 {
 661         struct sk_buff *skb;
 662         struct ieee80211_hdr *nullfunc;
 663         __le16 fc;
 664
 665         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 666                 return;
 667
 668         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 669         if (!skb)
 670                 return;
 671
 672         skb_reserve(skb, local->hw.extra_tx_headroom);
 673
 674         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 675         memset(nullfunc, 0, 30);
 676         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 677                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 678         nullfunc->frame_control = fc;
 679         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 680         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 681         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 682         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 683
 684         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 685         ieee80211_tx_skb(sdata, skb);
 686 }
 687
 688 /* spectrum management related things */
 689 static void ieee80211_chswitch_work(struct work_struct *work)
 690 {
 691         struct ieee80211_sub_if_data *sdata =
 692                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 693         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 694
 695         if (!ieee80211_sdata_running(sdata))
 696                 return;
 697
 698         mutex_lock(&ifmgd->mtx);
 699         if (!ifmgd->associated)
 700                 goto out;
 701
 702         sdata->local->oper_channel = sdata->local->csa_channel;
 703         if (!sdata->local->ops->channel_switch) {
 704                 /* call "hw_config" only if doing sw channel switch */
 705                 ieee80211_hw_config(sdata->local,
 706                         IEEE80211_CONF_CHANGE_CHANNEL);
 707         } else {
 708                 /* update the device channel directly */
 709                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 710         }
 711
 712         /* XXX: shouldn't really modify cfg80211-owned data! */
 713         ifmgd->associated->channel = sdata->local->oper_channel;
 714
 715         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 716                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 717  out:
 718         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 719         mutex_unlock(&ifmgd->mtx);
 720 }
 721
 722 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 723 {
 724         struct ieee80211_sub_if_data *sdata;
 725         struct ieee80211_if_managed *ifmgd;
 726
 727         sdata = vif_to_sdata(vif);
 728         ifmgd = &sdata->u.mgd;
 729
 730         trace_api_chswitch_done(sdata, success);
 731         if (!success) {
 732                 /*
 733                  * If the channel switch was not successful, stay
 734                  * around on the old channel. We currently lack
 735                  * good handling of this situation, possibly we
 736                  * should just drop the association.
 737                  */
 738                 sdata->local->csa_channel = sdata->local->oper_channel;
 739         }
 740
 741         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 742 }
 743 EXPORT_SYMBOL(ieee80211_chswitch_done);
 744
 745 static void ieee80211_chswitch_timer(unsigned long data)
 746 {
 747         struct ieee80211_sub_if_data *sdata =
 748                 (struct ieee80211_sub_if_data *) data;
 749         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 750
 751         if (sdata->local->quiescing) {
 752                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 753                 return;
 754         }
 755
 756         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 757 }
 758
 759 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 760                                       struct ieee80211_channel_sw_ie *sw_elem,
 761                                       struct ieee80211_bss *bss,
 762                                       u64 timestamp)
 763 {
 764         struct cfg80211_bss *cbss =
 765                 container_of((void *)bss, struct cfg80211_bss, priv);
 766         struct ieee80211_channel *new_ch;
 767         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 768         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 769                                                       cbss->channel->band);
 770
 771         ASSERT_MGD_MTX(ifmgd);
 772
 773         if (!ifmgd->associated)
 774                 return;
 775
 776         if (sdata->local->scanning)
 777                 return;
 778
 779         /* Disregard subsequent beacons if we are already running a timer
 780            processing a CSA */
 781
 782         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 783                 return;
 784
 785         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 786         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 787                 return;
 788
 789         sdata->local->csa_channel = new_ch;
 790
 791         if (sdata->local->ops->channel_switch) {
 792                 /* use driver's channel switch callback */
 793                 struct ieee80211_channel_switch ch_switch;
 794                 memset(&ch_switch, 0, sizeof(ch_switch));
 795                 ch_switch.timestamp = timestamp;
 796                 if (sw_elem->mode) {
 797                         ch_switch.block_tx = true;
 798                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 799                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 800                 }
 801                 ch_switch.channel = new_ch;
 802                 ch_switch.count = sw_elem->count;
 803                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 804                 drv_channel_switch(sdata->local, &ch_switch);
 805                 return;
 806         }
 807
 808         /* channel switch handled in software */
 809         if (sw_elem->count <= 1) {
 810                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 811         } else {
 812                 if (sw_elem->mode)
 813                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 814                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 815                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 816                 mod_timer(&ifmgd->chswitch_timer,
 817                           jiffies +
 818                           msecs_to_jiffies(sw_elem->count *
 819                                            cbss->beacon_interval));
 820         }
 821 }
 822
 823 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 824                                         u16 capab_info, u8 *pwr_constr_elem,
 825                                         u8 pwr_constr_elem_len)
 826 {
 827         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 828
 829         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 830                 return;
 831
 832         /* Power constraint IE length should be 1 octet */
 833         if (pwr_constr_elem_len != 1)
 834                 return;
 835
 836         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 837             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 838                 sdata->local->power_constr_level = *pwr_constr_elem;
 839                 ieee80211_hw_config(sdata->local, 0);
 840         }
 841 }
 842
 843 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 844 {
 845         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 846         struct ieee80211_local *local = sdata->local;
 847         struct ieee80211_conf *conf = &local->hw.conf;
 848
 849         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 850                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 851                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 852
 853         local->disable_dynamic_ps = false;
 854         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 855 }
 856 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 857
 858 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 859 {
 860         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 861         struct ieee80211_local *local = sdata->local;
 862         struct ieee80211_conf *conf = &local->hw.conf;
 863
 864         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 865                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 866                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 867
 868         local->disable_dynamic_ps = true;
 869         conf->dynamic_ps_timeout = 0;
 870         del_timer_sync(&local->dynamic_ps_timer);
 871         ieee80211_queue_work(&local->hw,
 872                              &local->dynamic_ps_enable_work);
 873 }
 874 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 875
 876 /* powersave */
 877 static void ieee80211_enable_ps(struct ieee80211_local *local,
 878                                 struct ieee80211_sub_if_data *sdata)
 879 {
 880         struct ieee80211_conf *conf = &local->hw.conf;
 881
 882         /*
 883          * If we are scanning right now then the parameters will
 884          * take effect when scan finishes.
 885          */
 886         if (local->scanning)
 887                 return;
 888
 889         if (conf->dynamic_ps_timeout > 0 &&
 890             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 891                 mod_timer(&local->dynamic_ps_timer, jiffies +
 892                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 893         } else {
 894                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 895                         ieee80211_send_nullfunc(local, sdata, 1);
 896
 897                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 898                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 899                         return;
 900
 901                 conf->flags |= IEEE80211_CONF_PS;
 902                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 903         }
 904 }
 905
 906 static void ieee80211_change_ps(struct ieee80211_local *local)
 907 {
 908         struct ieee80211_conf *conf = &local->hw.conf;
 909
 910         if (local->ps_sdata) {
 911                 ieee80211_enable_ps(local, local->ps_sdata);
 912         } else if (conf->flags & IEEE80211_CONF_PS) {
 913                 conf->flags &= ~IEEE80211_CONF_PS;
 914                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 915                 del_timer_sync(&local->dynamic_ps_timer);
 916                 cancel_work_sync(&local->dynamic_ps_enable_work);
 917         }
 918 }
 919
 920 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 921 {
 922         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 923         struct sta_info *sta = NULL;
 924         bool authorized = false;
 925
 926         if (!mgd->powersave)
 927                 return false;
 928
 929         if (mgd->broken_ap)
 930                 return false;
 931
 932         if (!mgd->associated)
 933                 return false;
 934
 935         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 936                           IEEE80211_STA_CONNECTION_POLL))
 937                 return false;
 938
 939         rcu_read_lock();
 940         sta = sta_info_get(sdata, mgd->bssid);
 941         if (sta)
 942                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 943         rcu_read_unlock();
 944
 945         return authorized;
 946 }
 947
 948 /* need to hold RTNL or interface lock */
 949 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 950 {
 951         struct ieee80211_sub_if_data *sdata, *found = NULL;
 952         int count = 0;
 953         int timeout;
 954
 955         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 956                 local->ps_sdata = NULL;
 957                 return;
 958         }
 959
 960         list_for_each_entry(sdata, &local->interfaces, list) {
 961                 if (!ieee80211_sdata_running(sdata))
 962                         continue;
 963                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 964                         /* If an AP vif is found, then disable PS
 965                          * by setting the count to zero thereby setting
 966                          * ps_sdata to NULL.
 967                          */
 968                         count = 0;
 969                         break;
 970                 }
 971                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 972                         continue;
 973                 found = sdata;
 974                 count++;
 975         }
 976
 977         if (count == 1 && ieee80211_powersave_allowed(found)) {
 978                 struct ieee80211_conf *conf = &local->hw.conf;
 979                 s32 beaconint_us;
 980
 981                 if (latency < 0)
 982                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 983
 984                 beaconint_us = ieee80211_tu_to_usec(
 985                                         found->vif.bss_conf.beacon_int);
 986
 987                 timeout = local->dynamic_ps_forced_timeout;
 988                 if (timeout < 0) {
 989                         /*
 990                          * Go to full PSM if the user configures a very low
 991                          * latency requirement.
 992                          * The 2000 second value is there for compatibility
 993                          * until the PM_QOS_NETWORK_LATENCY is configured
 994                          * with real values.
 995                          */
 996                         if (latency > (1900 * USEC_PER_MSEC) &&
 997                             latency != (2000 * USEC_PER_SEC))
 998                                 timeout = 0;
 999                         else
1000                                 timeout = 100;
1001                 }
1002                 local->dynamic_ps_user_timeout = timeout;
1003                 if (!local->disable_dynamic_ps)
1004                         conf->dynamic_ps_timeout =
1005                                 local->dynamic_ps_user_timeout;
1006
1007                 if (beaconint_us > latency) {
1008                         local->ps_sdata = NULL;
1009                 } else {
1010                         struct ieee80211_bss *bss;
1011                         int maxslp = 1;
1012                         u8 dtimper;
1013
1014                         bss = (void *)found->u.mgd.associated->priv;
1015                         dtimper = bss->dtim_period;
1016
1017                         /* If the TIM IE is invalid, pretend the value is 1 */
1018                         if (!dtimper)
1019                                 dtimper = 1;
1020                         else if (dtimper > 1)
1021                                 maxslp = min_t(int, dtimper,
1022                                                     latency / beaconint_us);
1023
1024                         local->hw.conf.max_sleep_period = maxslp;
1025                         local->hw.conf.ps_dtim_period = dtimper;
1026                         local->ps_sdata = found;
1027                 }
1028         } else {
1029                 local->ps_sdata = NULL;
1030         }
1031
1032         ieee80211_change_ps(local);
1033 }
1034
1035 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1036 {
1037         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1038
1039         if (sdata->vif.bss_conf.ps != ps_allowed) {
1040                 sdata->vif.bss_conf.ps = ps_allowed;
1041                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1042         }
1043 }
1044
1045 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1046 {
1047         struct ieee80211_local *local =
1048                 container_of(work, struct ieee80211_local,
1049                              dynamic_ps_disable_work);
1050
1051         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1052                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1053                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1054         }
1055
1056         ieee80211_wake_queues_by_reason(&local->hw,
1057                                         IEEE80211_QUEUE_STOP_REASON_PS);
1058 }
1059
1060 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1061 {
1062         struct ieee80211_local *local =
1063                 container_of(work, struct ieee80211_local,
1064                              dynamic_ps_enable_work);
1065         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1066         struct ieee80211_if_managed *ifmgd;
1067         unsigned long flags;
1068         int q;
1069
1070         /* can only happen when PS was just disabled anyway */
1071         if (!sdata)
1072                 return;
1073
1074         ifmgd = &sdata->u.mgd;
1075
1076         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1077                 return;
1078
1079         if (!local->disable_dynamic_ps &&
1080             local->hw.conf.dynamic_ps_timeout > 0) {
1081                 /* don't enter PS if TX frames are pending */
1082                 if (drv_tx_frames_pending(local)) {
1083                         mod_timer(&local->dynamic_ps_timer, jiffies +
1084                                   msecs_to_jiffies(
1085                                   local->hw.conf.dynamic_ps_timeout));
1086                         return;
1087                 }
1088
1089                 /*
1090                  * transmission can be stopped by others which leads to
1091                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1092                  * is not the actual idle state.
1093                  */
1094                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1095                 for (q = 0; q < local->hw.queues; q++) {
1096                         if (local->queue_stop_reasons[q]) {
1097                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1098                                                        flags);
1099                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1100                                           msecs_to_jiffies(
1101                                           local->hw.conf.dynamic_ps_timeout));
1102                                 return;
1103                         }
1104                 }
1105                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1106         }
1107
1108         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1109             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1110                 netif_tx_stop_all_queues(sdata->dev);
1111
1112                 if (drv_tx_frames_pending(local))
1113                         mod_timer(&local->dynamic_ps_timer, jiffies +
1114                                   msecs_to_jiffies(
1115                                   local->hw.conf.dynamic_ps_timeout));
1116                 else {
1117                         ieee80211_send_nullfunc(local, sdata, 1);
1118                         /* Flush to get the tx status of nullfunc frame */
1119                         drv_flush(local, false);
1120                 }
1121         }
1122
1123         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1124               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1125             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1126                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1127                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1128                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1129         }
1130
1131         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1132                 netif_tx_wake_all_queues(sdata->dev);
1133 }
1134
1135 void ieee80211_dynamic_ps_timer(unsigned long data)
1136 {
1137         struct ieee80211_local *local = (void *) data;
1138
1139         if (local->quiescing || local->suspended)
1140                 return;
1141
1142         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1143 }
1144
1145 /* MLME */
1146 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1147                                      struct ieee80211_sub_if_data *sdata,
1148                                      u8 *wmm_param, size_t wmm_param_len)
1149 {
1150         struct ieee80211_tx_queue_params params;
1151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1152         size_t left;
1153         int count;
1154         u8 *pos, uapsd_queues = 0;
1155
1156         if (!local->ops->conf_tx)
1157                 return false;
1158
1159         if (local->hw.queues < IEEE80211_NUM_ACS)
1160                 return false;
1161
1162         if (!wmm_param)
1163                 return false;
1164
1165         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1166                 return false;
1167
1168         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1169                 uapsd_queues = ifmgd->uapsd_queues;
1170
1171         count = wmm_param[6] & 0x0f;
1172         if (count == ifmgd->wmm_last_param_set)
1173                 return false;
1174         ifmgd->wmm_last_param_set = count;
1175
1176         pos = wmm_param + 8;
1177         left = wmm_param_len - 8;
1178
1179         memset(&params, 0, sizeof(params));
1180
1181         sdata->wmm_acm = 0;
1182         for (; left >= 4; left -= 4, pos += 4) {
1183                 int aci = (pos[0] >> 5) & 0x03;
1184                 int acm = (pos[0] >> 4) & 0x01;
1185                 bool uapsd = false;
1186                 int queue;
1187
1188                 switch (aci) {
1189                 case 1: /* AC_BK */
1190                         queue = 3;
1191                         if (acm)
1192                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1193                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1194                                 uapsd = true;
1195                         break;
1196                 case 2: /* AC_VI */
1197                         queue = 1;
1198                         if (acm)
1199                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1200                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1201                                 uapsd = true;
1202                         break;
1203                 case 3: /* AC_VO */
1204                         queue = 0;
1205                         if (acm)
1206                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1207                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1208                                 uapsd = true;
1209                         break;
1210                 case 0: /* AC_BE */
1211                 default:
1212                         queue = 2;
1213                         if (acm)
1214                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1215                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1216                                 uapsd = true;
1217                         break;
1218                 }
1219
1220                 params.aifs = pos[0] & 0x0f;
1221                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1222                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1223                 params.txop = get_unaligned_le16(pos + 2);
1224                 params.uapsd = uapsd;
1225
1226                 mlme_dbg(sdata,
1227                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1228                          queue, aci, acm,
1229                          params.aifs, params.cw_min, params.cw_max,
1230                          params.txop, params.uapsd);
1231                 sdata->tx_conf[queue] = params;
1232                 if (drv_conf_tx(local, sdata, queue, &params))
1233                         sdata_err(sdata,
1234                                   "failed to set TX queue parameters for queue %d\n",
1235                                   queue);
1236         }
1237
1238         /* enable WMM or activate new settings */
1239         sdata->vif.bss_conf.qos = true;
1240         return true;
1241 }
1242
1243 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1244 {
1245         lockdep_assert_held(&sdata->local->mtx);
1246
1247         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1248                                 IEEE80211_STA_BEACON_POLL);
1249         ieee80211_run_deferred_scan(sdata->local);
1250 }
1251
1252 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1253 {
1254         mutex_lock(&sdata->local->mtx);
1255         __ieee80211_stop_poll(sdata);
1256         mutex_unlock(&sdata->local->mtx);
1257 }
1258
1259 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1260                                            u16 capab, bool erp_valid, u8 erp)
1261 {
1262         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1263         u32 changed = 0;
1264         bool use_protection;
1265         bool use_short_preamble;
1266         bool use_short_slot;
1267
1268         if (erp_valid) {
1269                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1270                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1271         } else {
1272                 use_protection = false;
1273                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1274         }
1275
1276         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1277         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1278                 use_short_slot = true;
1279
1280         if (use_protection != bss_conf->use_cts_prot) {
1281                 bss_conf->use_cts_prot = use_protection;
1282                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1283         }
1284
1285         if (use_short_preamble != bss_conf->use_short_preamble) {
1286                 bss_conf->use_short_preamble = use_short_preamble;
1287                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1288         }
1289
1290         if (use_short_slot != bss_conf->use_short_slot) {
1291                 bss_conf->use_short_slot = use_short_slot;
1292                 changed |= BSS_CHANGED_ERP_SLOT;
1293         }
1294
1295         return changed;
1296 }
1297
1298 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1299                                      struct cfg80211_bss *cbss,
1300                                      u32 bss_info_changed)
1301 {
1302         struct ieee80211_bss *bss = (void *)cbss->priv;
1303         struct ieee80211_local *local = sdata->local;
1304         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1305
1306         bss_info_changed |= BSS_CHANGED_ASSOC;
1307         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1308                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1309
1310         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1311                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1312
1313         sdata->u.mgd.associated = cbss;
1314         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1315
1316         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1317
1318         /* just to be sure */
1319         ieee80211_stop_poll(sdata);
1320
1321         ieee80211_led_assoc(local, 1);
1322
1323         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1324                 bss_conf->dtim_period = bss->dtim_period;
1325         else
1326                 bss_conf->dtim_period = 0;
1327
1328         bss_conf->assoc = 1;
1329
1330         /* Tell the driver to monitor connection quality (if supported) */
1331         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1332             bss_conf->cqm_rssi_thold)
1333                 bss_info_changed |= BSS_CHANGED_CQM;
1334
1335         /* Enable ARP filtering */
1336         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1337                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1338                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1339         }
1340
1341         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1342
1343         mutex_lock(&local->iflist_mtx);
1344         ieee80211_recalc_ps(local, -1);
1345         ieee80211_recalc_smps(local);
1346         mutex_unlock(&local->iflist_mtx);
1347
1348         ieee80211_recalc_ps_vif(sdata);
1349
1350         netif_tx_start_all_queues(sdata->dev);
1351         netif_carrier_on(sdata->dev);
1352 }
1353
1354 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1355                                    u16 stype, u16 reason, bool tx,
1356                                    u8 *frame_buf)
1357 {
1358         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1359         struct ieee80211_local *local = sdata->local;
1360         struct sta_info *sta;
1361         u32 changed = 0;
1362
1363         ASSERT_MGD_MTX(ifmgd);
1364
1365         if (WARN_ON_ONCE(tx && !frame_buf))
1366                 return;
1367
1368         if (WARN_ON(!ifmgd->associated))
1369                 return;
1370
1371         ieee80211_stop_poll(sdata);
1372
1373         ifmgd->associated = NULL;
1374
1375         /*
1376          * we need to commit the associated = NULL change because the
1377          * scan code uses that to determine whether this iface should
1378          * go to/wake up from powersave or not -- and could otherwise
1379          * wake the queues erroneously.
1380          */
1381         smp_mb();
1382
1383         /*
1384          * Thus, we can only afterwards stop the queues -- to account
1385          * for the case where another CPU is finishing a scan at this
1386          * time -- we don't want the scan code to enable queues.
1387          */
1388
1389         netif_tx_stop_all_queues(sdata->dev);
1390         netif_carrier_off(sdata->dev);
1391
1392         mutex_lock(&local->sta_mtx);
1393         sta = sta_info_get(sdata, ifmgd->bssid);
1394         if (sta) {
1395                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1396                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1397         }
1398         mutex_unlock(&local->sta_mtx);
1399
1400         /*
1401          * if we want to get out of ps before disassoc (why?) we have
1402          * to do it before sending disassoc, as otherwise the null-packet
1403          * won't be valid.
1404          */
1405         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1406                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1407                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1408         }
1409         local->ps_sdata = NULL;
1410
1411         /* disable per-vif ps */
1412         ieee80211_recalc_ps_vif(sdata);
1413
1414         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1415         if (tx)
1416                 drv_flush(local, false);
1417
1418         /* deauthenticate/disassociate now */
1419         if (tx || frame_buf)
1420                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1421                                                reason, tx, frame_buf);
1422
1423         /* flush out frame */
1424         if (tx)
1425                 drv_flush(local, false);
1426
1427         /* clear bssid only after building the needed mgmt frames */
1428         memset(ifmgd->bssid, 0, ETH_ALEN);
1429
1430         /* remove AP and TDLS peers */
1431         sta_info_flush(local, sdata);
1432
1433         /* finally reset all BSS / config parameters */
1434         changed |= ieee80211_reset_erp_info(sdata);
1435
1436         ieee80211_led_assoc(local, 0);
1437         changed |= BSS_CHANGED_ASSOC;
1438         sdata->vif.bss_conf.assoc = false;
1439
1440         /* on the next assoc, re-program HT parameters */
1441         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1442         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1443
1444         local->power_constr_level = 0;
1445
1446         del_timer_sync(&local->dynamic_ps_timer);
1447         cancel_work_sync(&local->dynamic_ps_enable_work);
1448
1449         /* Disable ARP filtering */
1450         if (sdata->vif.bss_conf.arp_filter_enabled) {
1451                 sdata->vif.bss_conf.arp_filter_enabled = false;
1452                 changed |= BSS_CHANGED_ARP_FILTER;
1453         }
1454
1455         sdata->vif.bss_conf.qos = false;
1456         changed |= BSS_CHANGED_QOS;
1457
1458         /* The BSSID (not really interesting) and HT changed */
1459         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1460         ieee80211_bss_info_change_notify(sdata, changed);
1461
1462         /* channel(_type) changes are handled by ieee80211_hw_config */
1463         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1464         ieee80211_hw_config(local, 0);
1465
1466         /* disassociated - set to defaults now */
1467         ieee80211_set_wmm_default(sdata, false);
1468
1469         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1470         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1471         del_timer_sync(&sdata->u.mgd.timer);
1472         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1473 }
1474
1475 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1476                              struct ieee80211_hdr *hdr)
1477 {
1478         /*
1479          * We can postpone the mgd.timer whenever receiving unicast frames
1480          * from AP because we know that the connection is working both ways
1481          * at that time. But multicast frames (and hence also beacons) must
1482          * be ignored here, because we need to trigger the timer during
1483          * data idle periods for sending the periodic probe request to the
1484          * AP we're connected to.
1485          */
1486         if (is_multicast_ether_addr(hdr->addr1))
1487                 return;
1488
1489         ieee80211_sta_reset_conn_monitor(sdata);
1490 }
1491
1492 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1493 {
1494         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1495         struct ieee80211_local *local = sdata->local;
1496
1497         mutex_lock(&local->mtx);
1498         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1499                               IEEE80211_STA_CONNECTION_POLL))) {
1500                 mutex_unlock(&local->mtx);
1501                 return;
1502         }
1503
1504         __ieee80211_stop_poll(sdata);
1505
1506         mutex_lock(&local->iflist_mtx);
1507         ieee80211_recalc_ps(local, -1);
1508         mutex_unlock(&local->iflist_mtx);
1509
1510         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1511                 goto out;
1512
1513         /*
1514          * We've received a probe response, but are not sure whether
1515          * we have or will be receiving any beacons or data, so let's
1516          * schedule the timers again, just in case.
1517          */
1518         ieee80211_sta_reset_beacon_monitor(sdata);
1519
1520         mod_timer(&ifmgd->conn_mon_timer,
1521                   round_jiffies_up(jiffies +
1522                                    IEEE80211_CONNECTION_IDLE_TIME));
1523 out:
1524         mutex_unlock(&local->mtx);
1525 }
1526
1527 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1528                              struct ieee80211_hdr *hdr, bool ack)
1529 {
1530         if (!ieee80211_is_data(hdr->frame_control))
1531             return;
1532
1533         if (ack)
1534                 ieee80211_sta_reset_conn_monitor(sdata);
1535
1536         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1537             sdata->u.mgd.probe_send_count > 0) {
1538                 if (ack)
1539                         sdata->u.mgd.probe_send_count = 0;
1540                 else
1541                         sdata->u.mgd.nullfunc_failed = true;
1542                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1543         }
1544 }
1545
1546 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1547 {
1548         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1549         const u8 *ssid;
1550         u8 *dst = ifmgd->associated->bssid;
1551         u8 unicast_limit = max(1, max_probe_tries - 3);
1552
1553         /*
1554          * Try sending broadcast probe requests for the last three
1555          * probe requests after the first ones failed since some
1556          * buggy APs only support broadcast probe requests.
1557          */
1558         if (ifmgd->probe_send_count >= unicast_limit)
1559                 dst = NULL;
1560
1561         /*
1562          * When the hardware reports an accurate Tx ACK status, it's
1563          * better to send a nullfunc frame instead of a probe request,
1564          * as it will kick us off the AP quickly if we aren't associated
1565          * anymore. The timeout will be reset if the frame is ACKed by
1566          * the AP.
1567          */
1568         ifmgd->probe_send_count++;
1569
1570         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1571                 ifmgd->nullfunc_failed = false;
1572                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1573         } else {
1574                 int ssid_len;
1575
1576                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1577                 if (WARN_ON_ONCE(ssid == NULL))
1578                         ssid_len = 0;
1579                 else
1580                         ssid_len = ssid[1];
1581
1582                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1583                                          0, (u32) -1, true, false);
1584         }
1585
1586         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1587         run_again(ifmgd, ifmgd->probe_timeout);
1588         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1589                 drv_flush(sdata->local, false);
1590 }
1591
1592 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1593                                    bool beacon)
1594 {
1595         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1596         bool already = false;
1597
1598         if (!ieee80211_sdata_running(sdata))
1599                 return;
1600
1601         mutex_lock(&ifmgd->mtx);
1602
1603         if (!ifmgd->associated)
1604                 goto out;
1605
1606         mutex_lock(&sdata->local->mtx);
1607
1608         if (sdata->local->tmp_channel || sdata->local->scanning) {
1609                 mutex_unlock(&sdata->local->mtx);
1610                 goto out;
1611         }
1612
1613         if (beacon)
1614                 mlme_dbg_ratelimited(sdata,
1615                                      "detected beacon loss from AP - sending probe request\n");
1616
1617         ieee80211_cqm_rssi_notify(&sdata->vif,
1618                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1619
1620         /*
1621          * The driver/our work has already reported this event or the
1622          * connection monitoring has kicked in and we have already sent
1623          * a probe request. Or maybe the AP died and the driver keeps
1624          * reporting until we disassociate...
1625          *
1626          * In either case we have to ignore the current call to this
1627          * function (except for setting the correct probe reason bit)
1628          * because otherwise we would reset the timer every time and
1629          * never check whether we received a probe response!
1630          */
1631         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1632                             IEEE80211_STA_CONNECTION_POLL))
1633                 already = true;
1634
1635         if (beacon)
1636                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1637         else
1638                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1639
1640         mutex_unlock(&sdata->local->mtx);
1641
1642         if (already)
1643                 goto out;
1644
1645         mutex_lock(&sdata->local->iflist_mtx);
1646         ieee80211_recalc_ps(sdata->local, -1);
1647         mutex_unlock(&sdata->local->iflist_mtx);
1648
1649         ifmgd->probe_send_count = 0;
1650         ieee80211_mgd_probe_ap_send(sdata);
1651  out:
1652         mutex_unlock(&ifmgd->mtx);
1653 }
1654
1655 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1656                                           struct ieee80211_vif *vif)
1657 {
1658         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1659         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1660         struct cfg80211_bss *cbss;
1661         struct sk_buff *skb;
1662         const u8 *ssid;
1663         int ssid_len;
1664
1665         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1666                 return NULL;
1667
1668         ASSERT_MGD_MTX(ifmgd);
1669
1670         if (ifmgd->associated)
1671                 cbss = ifmgd->associated;
1672         else if (ifmgd->auth_data)
1673                 cbss = ifmgd->auth_data->bss;
1674         else if (ifmgd->assoc_data)
1675                 cbss = ifmgd->assoc_data->bss;
1676         else
1677                 return NULL;
1678
1679         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1680         if (WARN_ON_ONCE(ssid == NULL))
1681                 ssid_len = 0;
1682         else
1683                 ssid_len = ssid[1];
1684
1685         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1686                                         (u32) -1, ssid + 2, ssid_len,
1687                                         NULL, 0, true);
1688
1689         return skb;
1690 }
1691 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1692
1693 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1694 {
1695         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1696         struct ieee80211_local *local = sdata->local;
1697         u8 bssid[ETH_ALEN];
1698         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1699
1700         mutex_lock(&ifmgd->mtx);
1701         if (!ifmgd->associated) {
1702                 mutex_unlock(&ifmgd->mtx);
1703                 return;
1704         }
1705
1706         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1707
1708         sdata_info(sdata, "Connection to AP %pM lost\n", bssid);
1709
1710         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1711                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1712                                false, frame_buf);
1713         mutex_unlock(&ifmgd->mtx);
1714
1715         /*
1716          * must be outside lock due to cfg80211,
1717          * but that's not a problem.
1718          */
1719         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1720
1721         mutex_lock(&local->mtx);
1722         ieee80211_recalc_idle(local);
1723         mutex_unlock(&local->mtx);
1724 }
1725
1726 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1727 {
1728         struct ieee80211_sub_if_data *sdata =
1729                 container_of(work, struct ieee80211_sub_if_data,
1730                              u.mgd.beacon_connection_loss_work);
1731         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1732         struct sta_info *sta;
1733
1734         if (ifmgd->associated) {
1735                 rcu_read_lock();
1736                 sta = sta_info_get(sdata, ifmgd->bssid);
1737                 if (sta)
1738                         sta->beacon_loss_count++;
1739                 rcu_read_unlock();
1740         }
1741
1742         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1743                 __ieee80211_connection_loss(sdata);
1744         else
1745                 ieee80211_mgd_probe_ap(sdata, true);
1746 }
1747
1748 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1749 {
1750         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1751         struct ieee80211_hw *hw = &sdata->local->hw;
1752
1753         trace_api_beacon_loss(sdata);
1754
1755         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1756         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1757 }
1758 EXPORT_SYMBOL(ieee80211_beacon_loss);
1759
1760 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1761 {
1762         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1763         struct ieee80211_hw *hw = &sdata->local->hw;
1764
1765         trace_api_connection_loss(sdata);
1766
1767         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1768         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1769 }
1770 EXPORT_SYMBOL(ieee80211_connection_loss);
1771
1772
1773 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1774                                         bool assoc)
1775 {
1776         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1777
1778         lockdep_assert_held(&sdata->u.mgd.mtx);
1779
1780         if (!assoc) {
1781                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1782
1783                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1784                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1785         }
1786
1787         cfg80211_put_bss(auth_data->bss);
1788         kfree(auth_data);
1789         sdata->u.mgd.auth_data = NULL;
1790 }
1791
1792 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1793                                      struct ieee80211_mgmt *mgmt, size_t len)
1794 {
1795         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1796         u8 *pos;
1797         struct ieee802_11_elems elems;
1798
1799         pos = mgmt->u.auth.variable;
1800         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1801         if (!elems.challenge)
1802                 return;
1803         auth_data->expected_transaction = 4;
1804         drv_mgd_prepare_tx(sdata->local, sdata);
1805         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1806                             elems.challenge - 2, elems.challenge_len + 2,
1807                             auth_data->bss->bssid, auth_data->bss->bssid,
1808                             auth_data->key, auth_data->key_len,
1809                             auth_data->key_idx);
1810 }
1811
1812 static enum rx_mgmt_action __must_check
1813 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1814                        struct ieee80211_mgmt *mgmt, size_t len)
1815 {
1816         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1817         u8 bssid[ETH_ALEN];
1818         u16 auth_alg, auth_transaction, status_code;
1819         struct sta_info *sta;
1820
1821         lockdep_assert_held(&ifmgd->mtx);
1822
1823         if (len < 24 + 6)
1824                 return RX_MGMT_NONE;
1825
1826         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1827                 return RX_MGMT_NONE;
1828
1829         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1830
1831         if (!ether_addr_equal(bssid, mgmt->bssid))
1832                 return RX_MGMT_NONE;
1833
1834         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1835         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1836         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1837
1838         if (auth_alg != ifmgd->auth_data->algorithm ||
1839             auth_transaction != ifmgd->auth_data->expected_transaction)
1840                 return RX_MGMT_NONE;
1841
1842         if (status_code != WLAN_STATUS_SUCCESS) {
1843                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1844                            mgmt->sa, status_code);
1845                 ieee80211_destroy_auth_data(sdata, false);
1846                 return RX_MGMT_CFG80211_RX_AUTH;
1847         }
1848
1849         switch (ifmgd->auth_data->algorithm) {
1850         case WLAN_AUTH_OPEN:
1851         case WLAN_AUTH_LEAP:
1852         case WLAN_AUTH_FT:
1853                 break;
1854         case WLAN_AUTH_SHARED_KEY:
1855                 if (ifmgd->auth_data->expected_transaction != 4) {
1856                         ieee80211_auth_challenge(sdata, mgmt, len);
1857                         /* need another frame */
1858                         return RX_MGMT_NONE;
1859                 }
1860                 break;
1861         default:
1862                 WARN_ONCE(1, "invalid auth alg %d",
1863                           ifmgd->auth_data->algorithm);
1864                 return RX_MGMT_NONE;
1865         }
1866
1867         sdata_info(sdata, "authenticated\n");
1868         ifmgd->auth_data->done = true;
1869         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1870         run_again(ifmgd, ifmgd->auth_data->timeout);
1871
1872         /* move station state to auth */
1873         mutex_lock(&sdata->local->sta_mtx);
1874         sta = sta_info_get(sdata, bssid);
1875         if (!sta) {
1876                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1877                 goto out_err;
1878         }
1879         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1880                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1881                 goto out_err;
1882         }
1883         mutex_unlock(&sdata->local->sta_mtx);
1884
1885         return RX_MGMT_CFG80211_RX_AUTH;
1886  out_err:
1887         mutex_unlock(&sdata->local->sta_mtx);
1888         /* ignore frame -- wait for timeout */
1889         return RX_MGMT_NONE;
1890 }
1891
1892
1893 static enum rx_mgmt_action __must_check
1894 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1895                          struct ieee80211_mgmt *mgmt, size_t len)
1896 {
1897         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1898         const u8 *bssid = NULL;
1899         u16 reason_code;
1900
1901         lockdep_assert_held(&ifmgd->mtx);
1902
1903         if (len < 24 + 2)
1904                 return RX_MGMT_NONE;
1905
1906         if (!ifmgd->associated ||
1907             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1908                 return RX_MGMT_NONE;
1909
1910         bssid = ifmgd->associated->bssid;
1911
1912         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1913
1914         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1915                    bssid, reason_code);
1916
1917         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1918
1919         mutex_lock(&sdata->local->mtx);
1920         ieee80211_recalc_idle(sdata->local);
1921         mutex_unlock(&sdata->local->mtx);
1922
1923         return RX_MGMT_CFG80211_DEAUTH;
1924 }
1925
1926
1927 static enum rx_mgmt_action __must_check
1928 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1929                            struct ieee80211_mgmt *mgmt, size_t len)
1930 {
1931         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1932         u16 reason_code;
1933
1934         lockdep_assert_held(&ifmgd->mtx);
1935
1936         if (len < 24 + 2)
1937                 return RX_MGMT_NONE;
1938
1939         if (!ifmgd->associated ||
1940             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1941                 return RX_MGMT_NONE;
1942
1943         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1944
1945         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1946                    mgmt->sa, reason_code);
1947
1948         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1949
1950         mutex_lock(&sdata->local->mtx);
1951         ieee80211_recalc_idle(sdata->local);
1952         mutex_unlock(&sdata->local->mtx);
1953
1954         return RX_MGMT_CFG80211_DISASSOC;
1955 }
1956
1957 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1958                                 u8 *supp_rates, unsigned int supp_rates_len,
1959                                 u32 *rates, u32 *basic_rates,
1960                                 bool *have_higher_than_11mbit,
1961                                 int *min_rate, int *min_rate_index)
1962 {
1963         int i, j;
1964
1965         for (i = 0; i < supp_rates_len; i++) {
1966                 int rate = (supp_rates[i] & 0x7f) * 5;
1967                 bool is_basic = !!(supp_rates[i] & 0x80);
1968
1969                 if (rate > 110)
1970                         *have_higher_than_11mbit = true;
1971
1972                 /*
1973                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1974                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1975                  *
1976                  * Note: Even through the membership selector and the basic
1977                  *       rate flag share the same bit, they are not exactly
1978                  *       the same.
1979                  */
1980                 if (!!(supp_rates[i] & 0x80) &&
1981                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1982                         continue;
1983
1984                 for (j = 0; j < sband->n_bitrates; j++) {
1985                         if (sband->bitrates[j].bitrate == rate) {
1986                                 *rates |= BIT(j);
1987                                 if (is_basic)
1988                                         *basic_rates |= BIT(j);
1989                                 if (rate < *min_rate) {
1990                                         *min_rate = rate;
1991                                         *min_rate_index = j;
1992                                 }
1993                                 break;
1994                         }
1995                 }
1996         }
1997 }
1998
1999 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2000                                          bool assoc)
2001 {
2002         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2003
2004         lockdep_assert_held(&sdata->u.mgd.mtx);
2005
2006         if (!assoc) {
2007                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2008
2009                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2010                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2011         }
2012
2013         kfree(assoc_data);
2014         sdata->u.mgd.assoc_data = NULL;
2015 }
2016
2017 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2018                                     struct cfg80211_bss *cbss,
2019                                     struct ieee80211_mgmt *mgmt, size_t len)
2020 {
2021         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2022         struct ieee80211_local *local = sdata->local;
2023         struct ieee80211_supported_band *sband;
2024         struct sta_info *sta;
2025         u8 *pos;
2026         u16 capab_info, aid;
2027         struct ieee802_11_elems elems;
2028         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2029         u32 changed = 0;
2030         int err;
2031
2032         /* AssocResp and ReassocResp have identical structure */
2033
2034         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2035         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2036
2037         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2038                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2039                            aid);
2040         aid &= ~(BIT(15) | BIT(14));
2041
2042         ifmgd->broken_ap = false;
2043
2044         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2045                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2046                            aid);
2047                 aid = 0;
2048                 ifmgd->broken_ap = true;
2049         }
2050
2051         pos = mgmt->u.assoc_resp.variable;
2052         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2053
2054         if (!elems.supp_rates) {
2055                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2056                 return false;
2057         }
2058
2059         ifmgd->aid = aid;
2060
2061         mutex_lock(&sdata->local->sta_mtx);
2062         /*
2063          * station info was already allocated and inserted before
2064          * the association and should be available to us
2065          */
2066         sta = sta_info_get(sdata, cbss->bssid);
2067         if (WARN_ON(!sta)) {
2068                 mutex_unlock(&sdata->local->sta_mtx);
2069                 return false;
2070         }
2071
2072         sband = local->hw.wiphy->bands[local->oper_channel->band];
2073
2074         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2075                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2076                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2077
2078         sta->supports_40mhz =
2079                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2080
2081         rate_control_rate_init(sta);
2082
2083         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2084                 set_sta_flag(sta, WLAN_STA_MFP);
2085
2086         if (elems.wmm_param)
2087                 set_sta_flag(sta, WLAN_STA_WME);
2088
2089         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2090         if (!err)
2091                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2092         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2093                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2094         if (err) {
2095                 sdata_info(sdata,
2096                            "failed to move station %pM to desired state\n",
2097                            sta->sta.addr);
2098                 WARN_ON(__sta_info_destroy(sta));
2099                 mutex_unlock(&sdata->local->sta_mtx);
2100                 return false;
2101         }
2102
2103         mutex_unlock(&sdata->local->sta_mtx);
2104
2105         /*
2106          * Always handle WMM once after association regardless
2107          * of the first value the AP uses. Setting -1 here has
2108          * that effect because the AP values is an unsigned
2109          * 4-bit value.
2110          */
2111         ifmgd->wmm_last_param_set = -1;
2112
2113         if (elems.wmm_param)
2114                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2115                                          elems.wmm_param_len);
2116         else
2117                 ieee80211_set_wmm_default(sdata, false);
2118         changed |= BSS_CHANGED_QOS;
2119
2120         if (elems.ht_operation && elems.wmm_param &&
2121             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2122                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2123                                                   cbss->bssid, false);
2124
2125         /* set AID and assoc capability,
2126          * ieee80211_set_associated() will tell the driver */
2127         bss_conf->aid = aid;
2128         bss_conf->assoc_capability = capab_info;
2129         ieee80211_set_associated(sdata, cbss, changed);
2130
2131         /*
2132          * If we're using 4-addr mode, let the AP know that we're
2133          * doing so, so that it can create the STA VLAN on its side
2134          */
2135         if (ifmgd->use_4addr)
2136                 ieee80211_send_4addr_nullfunc(local, sdata);
2137
2138         /*
2139          * Start timer to probe the connection to the AP now.
2140          * Also start the timer that will detect beacon loss.
2141          */
2142         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2143         ieee80211_sta_reset_beacon_monitor(sdata);
2144
2145         return true;
2146 }
2147
2148 static enum rx_mgmt_action __must_check
2149 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2150                              struct ieee80211_mgmt *mgmt, size_t len,
2151                              struct cfg80211_bss **bss)
2152 {
2153         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2154         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2155         u16 capab_info, status_code, aid;
2156         struct ieee802_11_elems elems;
2157         u8 *pos;
2158         bool reassoc;
2159
2160         lockdep_assert_held(&ifmgd->mtx);
2161
2162         if (!assoc_data)
2163                 return RX_MGMT_NONE;
2164         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2165                 return RX_MGMT_NONE;
2166
2167         /*
2168          * AssocResp and ReassocResp have identical structure, so process both
2169          * of them in this function.
2170          */
2171
2172         if (len < 24 + 6)
2173                 return RX_MGMT_NONE;
2174
2175         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2176         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2177         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2178         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2179
2180         sdata_info(sdata,
2181                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2182                    reassoc ? "Rea" : "A", mgmt->sa,
2183                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2184
2185         pos = mgmt->u.assoc_resp.variable;
2186         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2187
2188         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2189             elems.timeout_int && elems.timeout_int_len == 5 &&
2190             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2191                 u32 tu, ms;
2192                 tu = get_unaligned_le32(elems.timeout_int + 1);
2193                 ms = tu * 1024 / 1000;
2194                 sdata_info(sdata,
2195                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2196                            mgmt->sa, tu, ms);
2197                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2198                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2199                         run_again(ifmgd, assoc_data->timeout);
2200                 return RX_MGMT_NONE;
2201         }
2202
2203         *bss = assoc_data->bss;
2204
2205         if (status_code != WLAN_STATUS_SUCCESS) {
2206                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2207                            mgmt->sa, status_code);
2208                 ieee80211_destroy_assoc_data(sdata, false);
2209         } else {
2210                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2211                         /* oops -- internal error -- send timeout for now */
2212                         ieee80211_destroy_assoc_data(sdata, false);
2213                         cfg80211_put_bss(*bss);
2214                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2215                 }
2216                 sdata_info(sdata, "associated\n");
2217
2218                 /*
2219                  * destroy assoc_data afterwards, as otherwise an idle
2220                  * recalc after assoc_data is NULL but before associated
2221                  * is set can cause the interface to go idle
2222                  */
2223                 ieee80211_destroy_assoc_data(sdata, true);
2224         }
2225
2226         return RX_MGMT_CFG80211_RX_ASSOC;
2227 }
2228 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2229                                   struct ieee80211_mgmt *mgmt,
2230                                   size_t len,
2231                                   struct ieee80211_rx_status *rx_status,
2232                                   struct ieee802_11_elems *elems,
2233                                   bool beacon)
2234 {
2235         struct ieee80211_local *local = sdata->local;
2236         int freq;
2237         struct ieee80211_bss *bss;
2238         struct ieee80211_channel *channel;
2239         bool need_ps = false;
2240
2241         if (sdata->u.mgd.associated &&
2242             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2243                 bss = (void *)sdata->u.mgd.associated->priv;
2244                 /* not previously set so we may need to recalc */
2245                 need_ps = !bss->dtim_period;
2246         }
2247
2248         if (elems->ds_params && elems->ds_params_len == 1)
2249                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2250                                                       rx_status->band);
2251         else
2252                 freq = rx_status->freq;
2253
2254         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2255
2256         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2257                 return;
2258
2259         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2260                                         channel, beacon);
2261         if (bss)
2262                 ieee80211_rx_bss_put(local, bss);
2263
2264         if (!sdata->u.mgd.associated)
2265                 return;
2266
2267         if (need_ps) {
2268                 mutex_lock(&local->iflist_mtx);
2269                 ieee80211_recalc_ps(local, -1);
2270                 mutex_unlock(&local->iflist_mtx);
2271         }
2272
2273         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2274             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2275                                                         ETH_ALEN) == 0)) {
2276                 struct ieee80211_channel_sw_ie *sw_elem =
2277                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2278                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2279                                                  bss, rx_status->mactime);
2280         }
2281 }
2282
2283
2284 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2285                                          struct sk_buff *skb)
2286 {
2287         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2288         struct ieee80211_if_managed *ifmgd;
2289         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2290         size_t baselen, len = skb->len;
2291         struct ieee802_11_elems elems;
2292
2293         ifmgd = &sdata->u.mgd;
2294
2295         ASSERT_MGD_MTX(ifmgd);
2296
2297         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2298                 return; /* ignore ProbeResp to foreign address */
2299
2300         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2301         if (baselen > len)
2302                 return;
2303
2304         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2305                                 &elems);
2306
2307         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2308
2309         if (ifmgd->associated &&
2310             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2311                 ieee80211_reset_ap_probe(sdata);
2312
2313         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2314             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2315                 /* got probe response, continue with auth */
2316                 sdata_info(sdata, "direct probe responded\n");
2317                 ifmgd->auth_data->tries = 0;
2318                 ifmgd->auth_data->timeout = jiffies;
2319                 run_again(ifmgd, ifmgd->auth_data->timeout);
2320         }
2321 }
2322
2323 /*
2324  * This is the canonical list of information elements we care about,
2325  * the filter code also gives us all changes to the Microsoft OUI
2326  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2327  *
2328  * We implement beacon filtering in software since that means we can
2329  * avoid processing the frame here and in cfg80211, and userspace
2330  * will not be able to tell whether the hardware supports it or not.
2331  *
2332  * XXX: This list needs to be dynamic -- userspace needs to be able to
2333  *      add items it requires. It also needs to be able to tell us to
2334  *      look out for other vendor IEs.
2335  */
2336 static const u64 care_about_ies =
2337         (1ULL << WLAN_EID_COUNTRY) |
2338         (1ULL << WLAN_EID_ERP_INFO) |
2339         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2340         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2341         (1ULL << WLAN_EID_HT_CAPABILITY) |
2342         (1ULL << WLAN_EID_HT_OPERATION);
2343
2344 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2345                                      struct ieee80211_mgmt *mgmt,
2346                                      size_t len,
2347                                      struct ieee80211_rx_status *rx_status)
2348 {
2349         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2350         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2351         size_t baselen;
2352         struct ieee802_11_elems elems;
2353         struct ieee80211_local *local = sdata->local;
2354         u32 changed = 0;
2355         bool erp_valid, directed_tim = false;
2356         u8 erp_value = 0;
2357         u32 ncrc;
2358         u8 *bssid;
2359
2360         lockdep_assert_held(&ifmgd->mtx);
2361
2362         /* Process beacon from the current BSS */
2363         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2364         if (baselen > len)
2365                 return;
2366
2367         if (rx_status->freq != local->hw.conf.channel->center_freq)
2368                 return;
2369
2370         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2371             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2372                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2373                                        len - baselen, &elems);
2374
2375                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2376                                       false);
2377                 ifmgd->assoc_data->have_beacon = true;
2378                 ifmgd->assoc_data->sent_assoc = false;
2379                 /* continue assoc process */
2380                 ifmgd->assoc_data->timeout = jiffies;
2381                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2382                 return;
2383         }
2384
2385         if (!ifmgd->associated ||
2386             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2387                 return;
2388         bssid = ifmgd->associated->bssid;
2389
2390         /* Track average RSSI from the Beacon frames of the current AP */
2391         ifmgd->last_beacon_signal = rx_status->signal;
2392         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2393                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2394                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2395                 ifmgd->last_cqm_event_signal = 0;
2396                 ifmgd->count_beacon_signal = 1;
2397                 ifmgd->last_ave_beacon_signal = 0;
2398         } else {
2399                 ifmgd->ave_beacon_signal =
2400                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2401                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2402                          ifmgd->ave_beacon_signal) / 16;
2403                 ifmgd->count_beacon_signal++;
2404         }
2405
2406         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2407             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2408                 int sig = ifmgd->ave_beacon_signal;
2409                 int last_sig = ifmgd->last_ave_beacon_signal;
2410
2411                 /*
2412                  * if signal crosses either of the boundaries, invoke callback
2413                  * with appropriate parameters
2414                  */
2415                 if (sig > ifmgd->rssi_max_thold &&
2416                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2417                         ifmgd->last_ave_beacon_signal = sig;
2418                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2419                 } else if (sig < ifmgd->rssi_min_thold &&
2420                            (last_sig >= ifmgd->rssi_max_thold ||
2421                            last_sig == 0)) {
2422                         ifmgd->last_ave_beacon_signal = sig;
2423                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2424                 }
2425         }
2426
2427         if (bss_conf->cqm_rssi_thold &&
2428             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2429             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2430                 int sig = ifmgd->ave_beacon_signal / 16;
2431                 int last_event = ifmgd->last_cqm_event_signal;
2432                 int thold = bss_conf->cqm_rssi_thold;
2433                 int hyst = bss_conf->cqm_rssi_hyst;
2434                 if (sig < thold &&
2435                     (last_event == 0 || sig < last_event - hyst)) {
2436                         ifmgd->last_cqm_event_signal = sig;
2437                         ieee80211_cqm_rssi_notify(
2438                                 &sdata->vif,
2439                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2440                                 GFP_KERNEL);
2441                 } else if (sig > thold &&
2442                            (last_event == 0 || sig > last_event + hyst)) {
2443                         ifmgd->last_cqm_event_signal = sig;
2444                         ieee80211_cqm_rssi_notify(
2445                                 &sdata->vif,
2446                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2447                                 GFP_KERNEL);
2448                 }
2449         }
2450
2451         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2452                 mlme_dbg_ratelimited(sdata,
2453                                      "cancelling probereq poll due to a received beacon\n");
2454                 mutex_lock(&local->mtx);
2455                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2456                 ieee80211_run_deferred_scan(local);
2457                 mutex_unlock(&local->mtx);
2458
2459                 mutex_lock(&local->iflist_mtx);
2460                 ieee80211_recalc_ps(local, -1);
2461                 mutex_unlock(&local->iflist_mtx);
2462         }
2463
2464         /*
2465          * Push the beacon loss detection into the future since
2466          * we are processing a beacon from the AP just now.
2467          */
2468         ieee80211_sta_reset_beacon_monitor(sdata);
2469
2470         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2471         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2472                                           len - baselen, &elems,
2473                                           care_about_ies, ncrc);
2474
2475         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2476                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2477                                                    ifmgd->aid);
2478
2479         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2480                 if (directed_tim) {
2481                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2482                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2483                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2484                                         ieee80211_hw_config(local,
2485                                                             IEEE80211_CONF_CHANGE_PS);
2486                                 }
2487                                 ieee80211_send_nullfunc(local, sdata, 0);
2488                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2489                                 local->pspolling = true;
2490
2491                                 /*
2492                                  * Here is assumed that the driver will be
2493                                  * able to send ps-poll frame and receive a
2494                                  * response even though power save mode is
2495                                  * enabled, but some drivers might require
2496                                  * to disable power save here. This needs
2497                                  * to be investigated.
2498                                  */
2499                                 ieee80211_send_pspoll(local, sdata);
2500                         }
2501                 }
2502         }
2503
2504         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2505                 return;
2506         ifmgd->beacon_crc = ncrc;
2507         ifmgd->beacon_crc_valid = true;
2508
2509         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2510                               true);
2511
2512         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2513                                      elems.wmm_param_len))
2514                 changed |= BSS_CHANGED_QOS;
2515
2516         if (elems.erp_info && elems.erp_info_len >= 1) {
2517                 erp_valid = true;
2518                 erp_value = elems.erp_info[0];
2519         } else {
2520                 erp_valid = false;
2521         }
2522         changed |= ieee80211_handle_bss_capability(sdata,
2523                         le16_to_cpu(mgmt->u.beacon.capab_info),
2524                         erp_valid, erp_value);
2525
2526
2527         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2528             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2529                 struct ieee80211_supported_band *sband;
2530
2531                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2532
2533                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2534                                                   bssid, true);
2535         }
2536
2537         /* Note: country IE parsing is done for us by cfg80211 */
2538         if (elems.country_elem) {
2539                 /* TODO: IBSS also needs this */
2540                 if (elems.pwr_constr_elem)
2541                         ieee80211_handle_pwr_constr(sdata,
2542                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2543                                 elems.pwr_constr_elem,
2544                                 elems.pwr_constr_elem_len);
2545         }
2546
2547         ieee80211_bss_info_change_notify(sdata, changed);
2548 }
2549
2550 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2551                                   struct sk_buff *skb)
2552 {
2553         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2554         struct ieee80211_rx_status *rx_status;
2555         struct ieee80211_mgmt *mgmt;
2556         struct cfg80211_bss *bss = NULL;
2557         enum rx_mgmt_action rma = RX_MGMT_NONE;
2558         u16 fc;
2559
2560         rx_status = (struct ieee80211_rx_status *) skb->cb;
2561         mgmt = (struct ieee80211_mgmt *) skb->data;
2562         fc = le16_to_cpu(mgmt->frame_control);
2563
2564         mutex_lock(&ifmgd->mtx);
2565
2566         switch (fc & IEEE80211_FCTL_STYPE) {
2567         case IEEE80211_STYPE_BEACON:
2568                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2569                 break;
2570         case IEEE80211_STYPE_PROBE_RESP:
2571                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2572                 break;
2573         case IEEE80211_STYPE_AUTH:
2574                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2575                 break;
2576         case IEEE80211_STYPE_DEAUTH:
2577                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2578                 break;
2579         case IEEE80211_STYPE_DISASSOC:
2580                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2581                 break;
2582         case IEEE80211_STYPE_ASSOC_RESP:
2583         case IEEE80211_STYPE_REASSOC_RESP:
2584                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2585                 break;
2586         case IEEE80211_STYPE_ACTION:
2587                 switch (mgmt->u.action.category) {
2588                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2589                         ieee80211_sta_process_chanswitch(sdata,
2590                                         &mgmt->u.action.u.chan_switch.sw_elem,
2591                                         (void *)ifmgd->associated->priv,
2592                                         rx_status->mactime);
2593                         break;
2594                 }
2595         }
2596         mutex_unlock(&ifmgd->mtx);
2597
2598         switch (rma) {
2599         case RX_MGMT_NONE:
2600                 /* no action */
2601                 break;
2602         case RX_MGMT_CFG80211_DEAUTH:
2603                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2604                 break;
2605         case RX_MGMT_CFG80211_DISASSOC:
2606                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2607                 break;
2608         case RX_MGMT_CFG80211_RX_AUTH:
2609                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2610                 break;
2611         case RX_MGMT_CFG80211_RX_ASSOC:
2612                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2613                 break;
2614         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2615                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2616                 break;
2617         default:
2618                 WARN(1, "unexpected: %d", rma);
2619         }
2620 }
2621
2622 static void ieee80211_sta_timer(unsigned long data)
2623 {
2624         struct ieee80211_sub_if_data *sdata =
2625                 (struct ieee80211_sub_if_data *) data;
2626         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2627         struct ieee80211_local *local = sdata->local;
2628
2629         if (local->quiescing) {
2630                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2631                 return;
2632         }
2633
2634         ieee80211_queue_work(&local->hw, &sdata->work);
2635 }
2636
2637 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2638                                           u8 *bssid, u8 reason)
2639 {
2640         struct ieee80211_local *local = sdata->local;
2641         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2642         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2643
2644         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2645                                false, frame_buf);
2646         mutex_unlock(&ifmgd->mtx);
2647
2648         /*
2649          * must be outside lock due to cfg80211,
2650          * but that's not a problem.
2651          */
2652         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2653
2654         mutex_lock(&local->mtx);
2655         ieee80211_recalc_idle(local);
2656         mutex_unlock(&local->mtx);
2657
2658         mutex_lock(&ifmgd->mtx);
2659 }
2660
2661 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2662 {
2663         struct ieee80211_local *local = sdata->local;
2664         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2665         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2666
2667         lockdep_assert_held(&ifmgd->mtx);
2668
2669         if (WARN_ON_ONCE(!auth_data))
2670                 return -EINVAL;
2671
2672         auth_data->tries++;
2673
2674         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2675                 sdata_info(sdata, "authentication with %pM timed out\n",
2676                            auth_data->bss->bssid);
2677
2678                 /*
2679                  * Most likely AP is not in the range so remove the
2680                  * bss struct for that AP.
2681                  */
2682                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2683
2684                 return -ETIMEDOUT;
2685         }
2686
2687         drv_mgd_prepare_tx(local, sdata);
2688
2689         if (auth_data->bss->proberesp_ies) {
2690                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2691                            auth_data->bss->bssid, auth_data->tries,
2692                            IEEE80211_AUTH_MAX_TRIES);
2693
2694                 auth_data->expected_transaction = 2;
2695                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2696                                     auth_data->ie, auth_data->ie_len,
2697                                     auth_data->bss->bssid,
2698                                     auth_data->bss->bssid, NULL, 0, 0);
2699         } else {
2700                 const u8 *ssidie;
2701
2702                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2703                            auth_data->bss->bssid, auth_data->tries,
2704                            IEEE80211_AUTH_MAX_TRIES);
2705
2706                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2707                 if (!ssidie)
2708                         return -EINVAL;
2709                 /*
2710                  * Direct probe is sent to broadcast address as some APs
2711                  * will not answer to direct packet in unassociated state.
2712                  */
2713                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2714                                          NULL, 0, (u32) -1, true, false);
2715         }
2716
2717         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2718         run_again(ifmgd, auth_data->timeout);
2719
2720         return 0;
2721 }
2722
2723 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2724 {
2725         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2726         struct ieee80211_local *local = sdata->local;
2727
2728         lockdep_assert_held(&sdata->u.mgd.mtx);
2729
2730         assoc_data->tries++;
2731         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2732                 sdata_info(sdata, "association with %pM timed out\n",
2733                            assoc_data->bss->bssid);
2734
2735                 /*
2736                  * Most likely AP is not in the range so remove the
2737                  * bss struct for that AP.
2738                  */
2739                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2740
2741                 return -ETIMEDOUT;
2742         }
2743
2744         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2745                    assoc_data->bss->bssid, assoc_data->tries,
2746                    IEEE80211_ASSOC_MAX_TRIES);
2747         ieee80211_send_assoc(sdata);
2748
2749         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2750         run_again(&sdata->u.mgd, assoc_data->timeout);
2751
2752         return 0;
2753 }
2754
2755 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2756 {
2757         struct ieee80211_local *local = sdata->local;
2758         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2759
2760         mutex_lock(&ifmgd->mtx);
2761
2762         if (ifmgd->auth_data &&
2763             time_after(jiffies, ifmgd->auth_data->timeout)) {
2764                 if (ifmgd->auth_data->done) {
2765                         /*
2766                          * ok ... we waited for assoc but userspace didn't,
2767                          * so let's just kill the auth data
2768                          */
2769                         ieee80211_destroy_auth_data(sdata, false);
2770                 } else if (ieee80211_probe_auth(sdata)) {
2771                         u8 bssid[ETH_ALEN];
2772
2773                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2774
2775                         ieee80211_destroy_auth_data(sdata, false);
2776
2777                         mutex_unlock(&ifmgd->mtx);
2778                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2779                         mutex_lock(&ifmgd->mtx);
2780                 }
2781         } else if (ifmgd->auth_data)
2782                 run_again(ifmgd, ifmgd->auth_data->timeout);
2783
2784         if (ifmgd->assoc_data &&
2785             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2786                 if (!ifmgd->assoc_data->have_beacon ||
2787                     ieee80211_do_assoc(sdata)) {
2788                         u8 bssid[ETH_ALEN];
2789
2790                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2791
2792                         ieee80211_destroy_assoc_data(sdata, false);
2793
2794                         mutex_unlock(&ifmgd->mtx);
2795                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2796                         mutex_lock(&ifmgd->mtx);
2797                 }
2798         } else if (ifmgd->assoc_data)
2799                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2800
2801         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2802                             IEEE80211_STA_CONNECTION_POLL) &&
2803             ifmgd->associated) {
2804                 u8 bssid[ETH_ALEN];
2805                 int max_tries;
2806
2807                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2808
2809                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2810                         max_tries = max_nullfunc_tries;
2811                 else
2812                         max_tries = max_probe_tries;
2813
2814                 /* ACK received for nullfunc probing frame */
2815                 if (!ifmgd->probe_send_count)
2816                         ieee80211_reset_ap_probe(sdata);
2817                 else if (ifmgd->nullfunc_failed) {
2818                         if (ifmgd->probe_send_count < max_tries) {
2819                                 mlme_dbg(sdata,
2820                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2821                                          bssid, ifmgd->probe_send_count,
2822                                          max_tries);
2823                                 ieee80211_mgd_probe_ap_send(sdata);
2824                         } else {
2825                                 mlme_dbg(sdata,
2826                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2827                                          bssid);
2828                                 ieee80211_sta_connection_lost(sdata, bssid,
2829                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2830                         }
2831                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2832                         run_again(ifmgd, ifmgd->probe_timeout);
2833                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2834                         mlme_dbg(sdata,
2835                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2836                                  bssid, probe_wait_ms);
2837                         ieee80211_sta_connection_lost(sdata, bssid,
2838                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2839                 } else if (ifmgd->probe_send_count < max_tries) {
2840                         mlme_dbg(sdata,
2841                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2842                                  bssid, probe_wait_ms,
2843                                  ifmgd->probe_send_count, max_tries);
2844                         ieee80211_mgd_probe_ap_send(sdata);
2845                 } else {
2846                         /*
2847                          * We actually lost the connection ... or did we?
2848                          * Let's make sure!
2849                          */
2850                         wiphy_debug(local->hw.wiphy,
2851                                     "%s: No probe response from AP %pM"
2852                                     " after %dms, disconnecting.\n",
2853                                     sdata->name,
2854                                     bssid, probe_wait_ms);
2855
2856                         ieee80211_sta_connection_lost(sdata, bssid,
2857                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2858                 }
2859         }
2860
2861         mutex_unlock(&ifmgd->mtx);
2862
2863         mutex_lock(&local->mtx);
2864         ieee80211_recalc_idle(local);
2865         mutex_unlock(&local->mtx);
2866 }
2867
2868 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2869 {
2870         struct ieee80211_sub_if_data *sdata =
2871                 (struct ieee80211_sub_if_data *) data;
2872         struct ieee80211_local *local = sdata->local;
2873
2874         if (local->quiescing)
2875                 return;
2876
2877         ieee80211_queue_work(&sdata->local->hw,
2878                              &sdata->u.mgd.beacon_connection_loss_work);
2879 }
2880
2881 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2882 {
2883         struct ieee80211_sub_if_data *sdata =
2884                 (struct ieee80211_sub_if_data *) data;
2885         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2886         struct ieee80211_local *local = sdata->local;
2887
2888         if (local->quiescing)
2889                 return;
2890
2891         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2892 }
2893
2894 static void ieee80211_sta_monitor_work(struct work_struct *work)
2895 {
2896         struct ieee80211_sub_if_data *sdata =
2897                 container_of(work, struct ieee80211_sub_if_data,
2898                              u.mgd.monitor_work);
2899
2900         ieee80211_mgd_probe_ap(sdata, false);
2901 }
2902
2903 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2904 {
2905         u32 flags;
2906
2907         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2908                 __ieee80211_stop_poll(sdata);
2909
2910                 /* let's probe the connection once */
2911                 flags = sdata->local->hw.flags;
2912                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2913                         ieee80211_queue_work(&sdata->local->hw,
2914                                              &sdata->u.mgd.monitor_work);
2915                 /* and do all the other regular work too */
2916                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2917         }
2918 }
2919
2920 #ifdef CONFIG_PM
2921 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2922 {
2923         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2924
2925         /*
2926          * we need to use atomic bitops for the running bits
2927          * only because both timers might fire at the same
2928          * time -- the code here is properly synchronised.
2929          */
2930
2931         cancel_work_sync(&ifmgd->request_smps_work);
2932
2933         cancel_work_sync(&ifmgd->monitor_work);
2934         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2935         if (del_timer_sync(&ifmgd->timer))
2936                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2937
2938         cancel_work_sync(&ifmgd->chswitch_work);
2939         if (del_timer_sync(&ifmgd->chswitch_timer))
2940                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2941
2942         /* these will just be re-established on connection */
2943         del_timer_sync(&ifmgd->conn_mon_timer);
2944         del_timer_sync(&ifmgd->bcn_mon_timer);
2945 }
2946
2947 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2948 {
2949         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2950
2951         if (!ifmgd->associated)
2952                 return;
2953
2954         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2955                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2956                 mutex_lock(&ifmgd->mtx);
2957                 if (ifmgd->associated) {
2958                         mlme_dbg(sdata,
2959                                  "driver requested disconnect after resume\n");
2960                         ieee80211_sta_connection_lost(sdata,
2961                                 ifmgd->associated->bssid,
2962                                 WLAN_REASON_UNSPECIFIED);
2963                         mutex_unlock(&ifmgd->mtx);
2964                         return;
2965                 }
2966                 mutex_unlock(&ifmgd->mtx);
2967         }
2968
2969         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2970                 add_timer(&ifmgd->timer);
2971         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2972                 add_timer(&ifmgd->chswitch_timer);
2973         ieee80211_sta_reset_beacon_monitor(sdata);
2974
2975         mutex_lock(&sdata->local->mtx);
2976         ieee80211_restart_sta_timer(sdata);
2977         mutex_unlock(&sdata->local->mtx);
2978 }
2979 #endif
2980
2981 /* interface setup */
2982 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2983 {
2984         struct ieee80211_if_managed *ifmgd;
2985
2986         ifmgd = &sdata->u.mgd;
2987         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2988         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2989         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2990                   ieee80211_beacon_connection_loss_work);
2991         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2992         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2993                     (unsigned long) sdata);
2994         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2995                     (unsigned long) sdata);
2996         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2997                     (unsigned long) sdata);
2998         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2999                     (unsigned long) sdata);
3000
3001         ifmgd->flags = 0;
3002         ifmgd->powersave = sdata->wdev.ps;
3003         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3004         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3005
3006         mutex_init(&ifmgd->mtx);
3007
3008         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3009                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3010         else
3011                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3012 }
3013
3014 /* scan finished notification */
3015 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3016 {
3017         struct ieee80211_sub_if_data *sdata;
3018
3019         /* Restart STA timers */
3020         rcu_read_lock();
3021         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3022                 ieee80211_restart_sta_timer(sdata);
3023         rcu_read_unlock();
3024 }
3025
3026 int ieee80211_max_network_latency(struct notifier_block *nb,
3027                                   unsigned long data, void *dummy)
3028 {
3029         s32 latency_usec = (s32) data;
3030         struct ieee80211_local *local =
3031                 container_of(nb, struct ieee80211_local,
3032                              network_latency_notifier);
3033
3034         mutex_lock(&local->iflist_mtx);
3035         ieee80211_recalc_ps(local, latency_usec);
3036         mutex_unlock(&local->iflist_mtx);
3037
3038         return 0;
3039 }
3040
3041 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3042                                      struct cfg80211_bss *cbss, bool assoc)
3043 {
3044         struct ieee80211_local *local = sdata->local;
3045         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3046         struct ieee80211_bss *bss = (void *)cbss->priv;
3047         struct sta_info *sta = NULL;
3048         bool have_sta = false;
3049         int err;
3050         int ht_cfreq;
3051         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3052         const u8 *ht_oper_ie;
3053         const struct ieee80211_ht_operation *ht_oper = NULL;
3054         struct ieee80211_supported_band *sband;
3055
3056         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3057                 return -EINVAL;
3058
3059         if (assoc) {
3060                 rcu_read_lock();
3061                 have_sta = sta_info_get(sdata, cbss->bssid);
3062                 rcu_read_unlock();
3063         }
3064
3065         if (!have_sta) {
3066                 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3067                 if (!sta)
3068                         return -ENOMEM;
3069         }
3070
3071         mutex_lock(&local->mtx);
3072         ieee80211_recalc_idle(sdata->local);
3073         mutex_unlock(&local->mtx);
3074
3075         /* switch to the right channel */
3076         sband = local->hw.wiphy->bands[cbss->channel->band];
3077
3078         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3079
3080         if (sband->ht_cap.ht_supported) {
3081                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3082                                               cbss->information_elements,
3083                                               cbss->len_information_elements);
3084                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3085                         ht_oper = (void *)(ht_oper_ie + 2);
3086         }
3087
3088         if (ht_oper) {
3089                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3090                                                           cbss->channel->band);
3091                 /* check that channel matches the right operating channel */
3092                 if (cbss->channel->center_freq != ht_cfreq) {
3093                         /*
3094                          * It's possible that some APs are confused here;
3095                          * Netgear WNDR3700 sometimes reports 4 higher than
3096                          * the actual channel in association responses, but
3097                          * since we look at probe response/beacon data here
3098                          * it should be OK.
3099                          */
3100                         sdata_info(sdata,
3101                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3102                                    cbss->channel->center_freq,
3103                                    ht_cfreq, ht_oper->primary_chan,
3104                                    cbss->channel->band);
3105                         ht_oper = NULL;
3106                 }
3107         }
3108
3109         if (ht_oper) {
3110                 channel_type = NL80211_CHAN_HT20;
3111
3112                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3113                         switch (ht_oper->ht_param &
3114                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3115                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3116                                 channel_type = NL80211_CHAN_HT40PLUS;
3117                                 break;
3118                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3119                                 channel_type = NL80211_CHAN_HT40MINUS;
3120                                 break;
3121                         }
3122                 }
3123         }
3124
3125         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3126                 /* can only fail due to HT40+/- mismatch */
3127                 channel_type = NL80211_CHAN_HT20;
3128                 sdata_info(sdata,
3129                            "disabling 40 MHz due to multi-vif mismatch\n");
3130                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3131                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3132                                                     channel_type));
3133         }
3134
3135         local->oper_channel = cbss->channel;
3136         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3137
3138         if (sta) {
3139                 u32 rates = 0, basic_rates = 0;
3140                 bool have_higher_than_11mbit;
3141                 int min_rate = INT_MAX, min_rate_index = -1;
3142
3143                 ieee80211_get_rates(sband, bss->supp_rates,
3144                                     bss->supp_rates_len,
3145                                     &rates, &basic_rates,
3146                                     &have_higher_than_11mbit,
3147                                     &min_rate, &min_rate_index);
3148
3149                 /*
3150                  * This used to be a workaround for basic rates missing
3151                  * in the association response frame. Now that we no
3152                  * longer use the basic rates from there, it probably
3153                  * doesn't happen any more, but keep the workaround so
3154                  * in case some *other* APs are buggy in different ways
3155                  * we can connect -- with a warning.
3156                  */
3157                 if (!basic_rates && min_rate_index >= 0) {
3158                         sdata_info(sdata,
3159                                    "No basic rates, using min rate instead\n");
3160                         basic_rates = BIT(min_rate_index);
3161                 }
3162
3163                 sta->sta.supp_rates[cbss->channel->band] = rates;
3164                 sdata->vif.bss_conf.basic_rates = basic_rates;
3165
3166                 /* cf. IEEE 802.11 9.2.12 */
3167                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3168                     have_higher_than_11mbit)
3169                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3170                 else
3171                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3172
3173                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3174
3175                 /* set timing information */
3176                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3177                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3178                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3179
3180                 /* tell driver about BSSID, basic rates and timing */
3181                 ieee80211_bss_info_change_notify(sdata,
3182                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3183                         BSS_CHANGED_BEACON_INT);
3184
3185                 if (assoc)
3186                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3187
3188                 err = sta_info_insert(sta);
3189                 sta = NULL;
3190                 if (err) {
3191                         sdata_info(sdata,
3192                                    "failed to insert STA entry for the AP (error %d)\n",
3193                                    err);
3194                         return err;
3195                 }
3196         } else
3197                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3198
3199         return 0;
3200 }
3201
3202 /* config hooks */
3203 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3204                        struct cfg80211_auth_request *req)
3205 {
3206         struct ieee80211_local *local = sdata->local;
3207         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3208         struct ieee80211_mgd_auth_data *auth_data;
3209         u16 auth_alg;
3210         int err;
3211
3212         /* prepare auth data structure */
3213
3214         switch (req->auth_type) {
3215         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3216                 auth_alg = WLAN_AUTH_OPEN;
3217                 break;
3218         case NL80211_AUTHTYPE_SHARED_KEY:
3219                 if (IS_ERR(local->wep_tx_tfm))
3220                         return -EOPNOTSUPP;
3221                 auth_alg = WLAN_AUTH_SHARED_KEY;
3222                 break;
3223         case NL80211_AUTHTYPE_FT:
3224                 auth_alg = WLAN_AUTH_FT;
3225                 break;
3226         case NL80211_AUTHTYPE_NETWORK_EAP:
3227                 auth_alg = WLAN_AUTH_LEAP;
3228                 break;
3229         default:
3230                 return -EOPNOTSUPP;
3231         }
3232
3233         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3234         if (!auth_data)
3235                 return -ENOMEM;
3236
3237         auth_data->bss = req->bss;
3238
3239         if (req->ie && req->ie_len) {
3240                 memcpy(auth_data->ie, req->ie, req->ie_len);
3241                 auth_data->ie_len = req->ie_len;
3242         }
3243
3244         if (req->key && req->key_len) {
3245                 auth_data->key_len = req->key_len;
3246                 auth_data->key_idx = req->key_idx;
3247                 memcpy(auth_data->key, req->key, req->key_len);
3248         }
3249
3250         auth_data->algorithm = auth_alg;
3251
3252         /* try to authenticate/probe */
3253
3254         mutex_lock(&ifmgd->mtx);
3255
3256         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3257             ifmgd->assoc_data) {
3258                 err = -EBUSY;
3259                 goto err_free;
3260         }
3261
3262         if (ifmgd->auth_data)
3263                 ieee80211_destroy_auth_data(sdata, false);
3264
3265         /* prep auth_data so we don't go into idle on disassoc */
3266         ifmgd->auth_data = auth_data;
3267
3268         if (ifmgd->associated)
3269                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3270
3271         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3272
3273         err = ieee80211_prep_connection(sdata, req->bss, false);
3274         if (err)
3275                 goto err_clear;
3276
3277         err = ieee80211_probe_auth(sdata);
3278         if (err) {
3279                 sta_info_destroy_addr(sdata, req->bss->bssid);
3280                 goto err_clear;
3281         }
3282
3283         /* hold our own reference */
3284         cfg80211_ref_bss(auth_data->bss);
3285         err = 0;
3286         goto out_unlock;
3287
3288  err_clear:
3289         ifmgd->auth_data = NULL;
3290  err_free:
3291         kfree(auth_data);
3292  out_unlock:
3293         mutex_unlock(&ifmgd->mtx);
3294
3295         return err;
3296 }
3297
3298 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3299                         struct cfg80211_assoc_request *req)
3300 {
3301         struct ieee80211_local *local = sdata->local;
3302         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3303         struct ieee80211_bss *bss = (void *)req->bss->priv;
3304         struct ieee80211_mgd_assoc_data *assoc_data;
3305         struct ieee80211_supported_band *sband;
3306         const u8 *ssidie, *ht_ie;
3307         int i, err;
3308
3309         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3310         if (!ssidie)
3311                 return -EINVAL;
3312
3313         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3314         if (!assoc_data)
3315                 return -ENOMEM;
3316
3317         mutex_lock(&ifmgd->mtx);
3318
3319         if (ifmgd->associated)
3320                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3321
3322         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3323                 err = -EBUSY;
3324                 goto err_free;
3325         }
3326
3327         if (ifmgd->assoc_data) {
3328                 err = -EBUSY;
3329                 goto err_free;
3330         }
3331
3332         if (ifmgd->auth_data) {
3333                 bool match;
3334
3335                 /* keep sta info, bssid if matching */
3336                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3337                 ieee80211_destroy_auth_data(sdata, match);
3338         }
3339
3340         /* prepare assoc data */
3341
3342         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3343         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3344         ifmgd->flags &= ~IEEE80211_STA_DISABLE_VHT;
3345
3346         ifmgd->beacon_crc_valid = false;
3347
3348         /*
3349          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3350          * We still associate in non-HT mode (11a/b/g) if any one of these
3351          * ciphers is configured as pairwise.
3352          * We can set this to true for non-11n hardware, that'll be checked
3353          * separately along with the peer capabilities.
3354          */
3355         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3356                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3357                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3358                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3359                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3360                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3361                         netdev_info(sdata->dev,
3362                                     "disabling HT/VHT due to WEP/TKIP use\n");
3363                 }
3364         }
3365
3366         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3367                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3368                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3369         }
3370
3371         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3372         sband = local->hw.wiphy->bands[req->bss->channel->band];
3373         if (!sband->ht_cap.ht_supported ||
3374             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3375                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3376                 netdev_info(sdata->dev,
3377                             "disabling HT as WMM/QoS is not supported\n");
3378         }
3379
3380         /* disable VHT if we don't support it or the AP doesn't use WMM */
3381         if (!sband->vht_cap.vht_supported ||
3382             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3383                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3384                 netdev_info(sdata->dev,
3385                             "disabling VHT as WMM/QoS is not supported\n");
3386         }
3387
3388         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3389         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3390                sizeof(ifmgd->ht_capa_mask));
3391
3392         if (req->ie && req->ie_len) {
3393                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3394                 assoc_data->ie_len = req->ie_len;
3395         }
3396
3397         assoc_data->bss = req->bss;
3398
3399         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3400                 if (ifmgd->powersave)
3401                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3402                 else
3403                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3404         } else
3405                 ifmgd->ap_smps = ifmgd->req_smps;
3406
3407         assoc_data->capability = req->bss->capability;
3408         assoc_data->wmm = bss->wmm_used &&
3409                           (local->hw.queues >= IEEE80211_NUM_ACS);
3410         assoc_data->supp_rates = bss->supp_rates;
3411         assoc_data->supp_rates_len = bss->supp_rates_len;
3412
3413         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3414         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3415                 assoc_data->ap_ht_param =
3416                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3417         else
3418                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3419
3420         if (bss->wmm_used && bss->uapsd_supported &&
3421             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3422                 assoc_data->uapsd = true;
3423                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3424         } else {
3425                 assoc_data->uapsd = false;
3426                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3427         }
3428
3429         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3430         assoc_data->ssid_len = ssidie[1];
3431
3432         if (req->prev_bssid)
3433                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3434
3435         if (req->use_mfp) {
3436                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3437                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3438         } else {
3439                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3440                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3441         }
3442
3443         if (req->crypto.control_port)
3444                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3445         else
3446                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3447
3448         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3449         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3450
3451         /* kick off associate process */
3452
3453         ifmgd->assoc_data = assoc_data;
3454
3455         err = ieee80211_prep_connection(sdata, req->bss, true);
3456         if (err)
3457                 goto err_clear;
3458
3459         if (!bss->dtim_period &&
3460             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3461                 /*
3462                  * Wait up to one beacon interval ...
3463                  * should this be more if we miss one?
3464                  */
3465                 sdata_info(sdata, "waiting for beacon from %pM\n",
3466                            ifmgd->bssid);
3467                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3468         } else {
3469                 assoc_data->have_beacon = true;
3470                 assoc_data->sent_assoc = false;
3471                 assoc_data->timeout = jiffies;
3472         }
3473         run_again(ifmgd, assoc_data->timeout);
3474
3475         if (bss->corrupt_data) {
3476                 char *corrupt_type = "data";
3477                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3478                         if (bss->corrupt_data &
3479                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3480                                 corrupt_type = "beacon and probe response";
3481                         else
3482                                 corrupt_type = "beacon";
3483                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3484                         corrupt_type = "probe response";
3485                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3486                            corrupt_type);
3487         }
3488
3489         err = 0;
3490         goto out;
3491  err_clear:
3492         ifmgd->assoc_data = NULL;
3493  err_free:
3494         kfree(assoc_data);
3495  out:
3496         mutex_unlock(&ifmgd->mtx);
3497
3498         return err;
3499 }
3500
3501 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3502                          struct cfg80211_deauth_request *req)
3503 {
3504         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3505         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3506
3507         mutex_lock(&ifmgd->mtx);
3508
3509         if (ifmgd->auth_data) {
3510                 ieee80211_destroy_auth_data(sdata, false);
3511                 mutex_unlock(&ifmgd->mtx);
3512                 return 0;
3513         }
3514
3515         sdata_info(sdata,
3516                    "deauthenticating from %pM by local choice (reason=%d)\n",
3517                    req->bssid, req->reason_code);
3518
3519         if (ifmgd->associated &&
3520             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
3521                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3522                                        req->reason_code, true, frame_buf);
3523         } else {
3524                 drv_mgd_prepare_tx(sdata->local, sdata);
3525                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3526                                                IEEE80211_STYPE_DEAUTH,
3527                                                req->reason_code, true,
3528                                                frame_buf);
3529         }
3530
3531         mutex_unlock(&ifmgd->mtx);
3532
3533         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3534
3535         mutex_lock(&sdata->local->mtx);
3536         ieee80211_recalc_idle(sdata->local);
3537         mutex_unlock(&sdata->local->mtx);
3538
3539         return 0;
3540 }
3541
3542 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3543                            struct cfg80211_disassoc_request *req)
3544 {
3545         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3546         u8 bssid[ETH_ALEN];
3547         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3548
3549         mutex_lock(&ifmgd->mtx);
3550
3551         /*
3552          * cfg80211 should catch this ... but it's racy since
3553          * we can receive a disassoc frame, process it, hand it
3554          * to cfg80211 while that's in a locked section already
3555          * trying to tell us that the user wants to disconnect.
3556          */
3557         if (ifmgd->associated != req->bss) {
3558                 mutex_unlock(&ifmgd->mtx);
3559                 return -ENOLINK;
3560         }
3561
3562         sdata_info(sdata,
3563                    "disassociating from %pM by local choice (reason=%d)\n",
3564                    req->bss->bssid, req->reason_code);
3565
3566         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3567         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3568                                req->reason_code, !req->local_state_change,
3569                                frame_buf);
3570         mutex_unlock(&ifmgd->mtx);
3571
3572         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3573
3574         mutex_lock(&sdata->local->mtx);
3575         ieee80211_recalc_idle(sdata->local);
3576         mutex_unlock(&sdata->local->mtx);
3577
3578         return 0;
3579 }
3580
3581 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3582 {
3583         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3584
3585         mutex_lock(&ifmgd->mtx);
3586         if (ifmgd->assoc_data)
3587                 ieee80211_destroy_assoc_data(sdata, false);
3588         if (ifmgd->auth_data)
3589                 ieee80211_destroy_auth_data(sdata, false);
3590         del_timer_sync(&ifmgd->timer);
3591         mutex_unlock(&ifmgd->mtx);
3592 }
3593
3594 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3595                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3596                                gfp_t gfp)
3597 {
3598         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3599
3600         trace_api_cqm_rssi_notify(sdata, rssi_event);
3601
3602         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3603 }
3604 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);