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->oper_channel->band];
 189
 190         switch (sdata->vif.bss_conf.channel_type) {
 191         case NL80211_CHAN_HT40PLUS:
 192                 if (local->oper_channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
 193                         disable_40 = true;
 194                 break;
 195         case NL80211_CHAN_HT40MINUS:
 196                 if (local->oper_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         /* XXX: wait for a beacon first? */
 716         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 717                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 718  out:
 719         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 720         mutex_unlock(&ifmgd->mtx);
 721 }
 722
 723 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 724 {
 725         struct ieee80211_sub_if_data *sdata;
 726         struct ieee80211_if_managed *ifmgd;
 727
 728         sdata = vif_to_sdata(vif);
 729         ifmgd = &sdata->u.mgd;
 730
 731         trace_api_chswitch_done(sdata, success);
 732         if (!success) {
 733                 sdata_info(sdata,
 734                            "driver channel switch failed, disconnecting\n");
 735                 ieee80211_queue_work(&sdata->local->hw,
 736                                      &ifmgd->csa_connection_drop_work);
 737         } else {
 738                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 739         }
 740 }
 741 EXPORT_SYMBOL(ieee80211_chswitch_done);
 742
 743 static void ieee80211_chswitch_timer(unsigned long data)
 744 {
 745         struct ieee80211_sub_if_data *sdata =
 746                 (struct ieee80211_sub_if_data *) data;
 747         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 748
 749         if (sdata->local->quiescing) {
 750                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 751                 return;
 752         }
 753
 754         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 755 }
 756
 757 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 758                                       struct ieee80211_channel_sw_ie *sw_elem,
 759                                       struct ieee80211_bss *bss,
 760                                       u64 timestamp)
 761 {
 762         struct cfg80211_bss *cbss =
 763                 container_of((void *)bss, struct cfg80211_bss, priv);
 764         struct ieee80211_channel *new_ch;
 765         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 766         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 767                                                       cbss->channel->band);
 768
 769         ASSERT_MGD_MTX(ifmgd);
 770
 771         if (!ifmgd->associated)
 772                 return;
 773
 774         if (sdata->local->scanning)
 775                 return;
 776
 777         /* Disregard subsequent beacons if we are already running a timer
 778            processing a CSA */
 779
 780         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 781                 return;
 782
 783         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 784         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
 785                 sdata_info(sdata,
 786                            "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
 787                            ifmgd->associated->bssid, new_freq);
 788                 ieee80211_queue_work(&sdata->local->hw,
 789                                      &ifmgd->csa_connection_drop_work);
 790                 return;
 791         }
 792
 793         sdata->local->csa_channel = new_ch;
 794
 795         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 796
 797         if (sw_elem->mode)
 798                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 799                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 800
 801         if (sdata->local->ops->channel_switch) {
 802                 /* use driver's channel switch callback */
 803                 struct ieee80211_channel_switch ch_switch = {
 804                         .timestamp = timestamp,
 805                         .block_tx = sw_elem->mode,
 806                         .channel = new_ch,
 807                         .count = sw_elem->count,
 808                 };
 809
 810                 drv_channel_switch(sdata->local, &ch_switch);
 811                 return;
 812         }
 813
 814         /* channel switch handled in software */
 815         if (sw_elem->count <= 1)
 816                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 817         else
 818                 mod_timer(&ifmgd->chswitch_timer,
 819                           TU_TO_EXP_TIME(sw_elem->count *
 820                                          cbss->beacon_interval));
 821 }
 822
 823 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 824                                         u16 capab_info, u8 *pwr_constr_elem)
 825 {
 826         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 827
 828         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 829                 return;
 830
 831         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 832             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 833                 sdata->local->power_constr_level = *pwr_constr_elem;
 834                 ieee80211_hw_config(sdata->local, 0);
 835         }
 836 }
 837
 838 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 839 {
 840         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 841         struct ieee80211_local *local = sdata->local;
 842         struct ieee80211_conf *conf = &local->hw.conf;
 843
 844         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 845                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 846                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 847
 848         local->disable_dynamic_ps = false;
 849         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 850 }
 851 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 852
 853 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 854 {
 855         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 856         struct ieee80211_local *local = sdata->local;
 857         struct ieee80211_conf *conf = &local->hw.conf;
 858
 859         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 860                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 861                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 862
 863         local->disable_dynamic_ps = true;
 864         conf->dynamic_ps_timeout = 0;
 865         del_timer_sync(&local->dynamic_ps_timer);
 866         ieee80211_queue_work(&local->hw,
 867                              &local->dynamic_ps_enable_work);
 868 }
 869 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 870
 871 /* powersave */
 872 static void ieee80211_enable_ps(struct ieee80211_local *local,
 873                                 struct ieee80211_sub_if_data *sdata)
 874 {
 875         struct ieee80211_conf *conf = &local->hw.conf;
 876
 877         /*
 878          * If we are scanning right now then the parameters will
 879          * take effect when scan finishes.
 880          */
 881         if (local->scanning)
 882                 return;
 883
 884         if (conf->dynamic_ps_timeout > 0 &&
 885             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 886                 mod_timer(&local->dynamic_ps_timer, jiffies +
 887                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 888         } else {
 889                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 890                         ieee80211_send_nullfunc(local, sdata, 1);
 891
 892                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 893                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 894                         return;
 895
 896                 conf->flags |= IEEE80211_CONF_PS;
 897                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 898         }
 899 }
 900
 901 static void ieee80211_change_ps(struct ieee80211_local *local)
 902 {
 903         struct ieee80211_conf *conf = &local->hw.conf;
 904
 905         if (local->ps_sdata) {
 906                 ieee80211_enable_ps(local, local->ps_sdata);
 907         } else if (conf->flags & IEEE80211_CONF_PS) {
 908                 conf->flags &= ~IEEE80211_CONF_PS;
 909                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 910                 del_timer_sync(&local->dynamic_ps_timer);
 911                 cancel_work_sync(&local->dynamic_ps_enable_work);
 912         }
 913 }
 914
 915 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 916 {
 917         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 918         struct sta_info *sta = NULL;
 919         bool authorized = false;
 920
 921         if (!mgd->powersave)
 922                 return false;
 923
 924         if (mgd->broken_ap)
 925                 return false;
 926
 927         if (!mgd->associated)
 928                 return false;
 929
 930         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 931                           IEEE80211_STA_CONNECTION_POLL))
 932                 return false;
 933
 934         rcu_read_lock();
 935         sta = sta_info_get(sdata, mgd->bssid);
 936         if (sta)
 937                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 938         rcu_read_unlock();
 939
 940         return authorized;
 941 }
 942
 943 /* need to hold RTNL or interface lock */
 944 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 945 {
 946         struct ieee80211_sub_if_data *sdata, *found = NULL;
 947         int count = 0;
 948         int timeout;
 949
 950         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 951                 local->ps_sdata = NULL;
 952                 return;
 953         }
 954
 955         list_for_each_entry(sdata, &local->interfaces, list) {
 956                 if (!ieee80211_sdata_running(sdata))
 957                         continue;
 958                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 959                         /* If an AP vif is found, then disable PS
 960                          * by setting the count to zero thereby setting
 961                          * ps_sdata to NULL.
 962                          */
 963                         count = 0;
 964                         break;
 965                 }
 966                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 967                         continue;
 968                 found = sdata;
 969                 count++;
 970         }
 971
 972         if (count == 1 && ieee80211_powersave_allowed(found)) {
 973                 struct ieee80211_conf *conf = &local->hw.conf;
 974                 s32 beaconint_us;
 975
 976                 if (latency < 0)
 977                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 978
 979                 beaconint_us = ieee80211_tu_to_usec(
 980                                         found->vif.bss_conf.beacon_int);
 981
 982                 timeout = local->dynamic_ps_forced_timeout;
 983                 if (timeout < 0) {
 984                         /*
 985                          * Go to full PSM if the user configures a very low
 986                          * latency requirement.
 987                          * The 2000 second value is there for compatibility
 988                          * until the PM_QOS_NETWORK_LATENCY is configured
 989                          * with real values.
 990                          */
 991                         if (latency > (1900 * USEC_PER_MSEC) &&
 992                             latency != (2000 * USEC_PER_SEC))
 993                                 timeout = 0;
 994                         else
 995                                 timeout = 100;
 996                 }
 997                 local->dynamic_ps_user_timeout = timeout;
 998                 if (!local->disable_dynamic_ps)
 999                         conf->dynamic_ps_timeout =
1000                                 local->dynamic_ps_user_timeout;
1001
1002                 if (beaconint_us > latency) {
1003                         local->ps_sdata = NULL;
1004                 } else {
1005                         struct ieee80211_bss *bss;
1006                         int maxslp = 1;
1007                         u8 dtimper;
1008
1009                         bss = (void *)found->u.mgd.associated->priv;
1010                         dtimper = bss->dtim_period;
1011
1012                         /* If the TIM IE is invalid, pretend the value is 1 */
1013                         if (!dtimper)
1014                                 dtimper = 1;
1015                         else if (dtimper > 1)
1016                                 maxslp = min_t(int, dtimper,
1017                                                     latency / beaconint_us);
1018
1019                         local->hw.conf.max_sleep_period = maxslp;
1020                         local->hw.conf.ps_dtim_period = dtimper;
1021                         local->ps_sdata = found;
1022                 }
1023         } else {
1024                 local->ps_sdata = NULL;
1025         }
1026
1027         ieee80211_change_ps(local);
1028 }
1029
1030 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1031 {
1032         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1033
1034         if (sdata->vif.bss_conf.ps != ps_allowed) {
1035                 sdata->vif.bss_conf.ps = ps_allowed;
1036                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1037         }
1038 }
1039
1040 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1041 {
1042         struct ieee80211_local *local =
1043                 container_of(work, struct ieee80211_local,
1044                              dynamic_ps_disable_work);
1045
1046         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1047                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1048                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1049         }
1050
1051         ieee80211_wake_queues_by_reason(&local->hw,
1052                                         IEEE80211_QUEUE_STOP_REASON_PS);
1053 }
1054
1055 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1056 {
1057         struct ieee80211_local *local =
1058                 container_of(work, struct ieee80211_local,
1059                              dynamic_ps_enable_work);
1060         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1061         struct ieee80211_if_managed *ifmgd;
1062         unsigned long flags;
1063         int q;
1064
1065         /* can only happen when PS was just disabled anyway */
1066         if (!sdata)
1067                 return;
1068
1069         ifmgd = &sdata->u.mgd;
1070
1071         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1072                 return;
1073
1074         if (!local->disable_dynamic_ps &&
1075             local->hw.conf.dynamic_ps_timeout > 0) {
1076                 /* don't enter PS if TX frames are pending */
1077                 if (drv_tx_frames_pending(local)) {
1078                         mod_timer(&local->dynamic_ps_timer, jiffies +
1079                                   msecs_to_jiffies(
1080                                   local->hw.conf.dynamic_ps_timeout));
1081                         return;
1082                 }
1083
1084                 /*
1085                  * transmission can be stopped by others which leads to
1086                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1087                  * is not the actual idle state.
1088                  */
1089                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1090                 for (q = 0; q < local->hw.queues; q++) {
1091                         if (local->queue_stop_reasons[q]) {
1092                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1093                                                        flags);
1094                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1095                                           msecs_to_jiffies(
1096                                           local->hw.conf.dynamic_ps_timeout));
1097                                 return;
1098                         }
1099                 }
1100                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1101         }
1102
1103         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1104             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1105                 netif_tx_stop_all_queues(sdata->dev);
1106
1107                 if (drv_tx_frames_pending(local))
1108                         mod_timer(&local->dynamic_ps_timer, jiffies +
1109                                   msecs_to_jiffies(
1110                                   local->hw.conf.dynamic_ps_timeout));
1111                 else {
1112                         ieee80211_send_nullfunc(local, sdata, 1);
1113                         /* Flush to get the tx status of nullfunc frame */
1114                         drv_flush(local, false);
1115                 }
1116         }
1117
1118         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1119               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1120             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1121                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1122                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1123                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1124         }
1125
1126         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1127                 netif_tx_wake_all_queues(sdata->dev);
1128 }
1129
1130 void ieee80211_dynamic_ps_timer(unsigned long data)
1131 {
1132         struct ieee80211_local *local = (void *) data;
1133
1134         if (local->quiescing || local->suspended)
1135                 return;
1136
1137         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1138 }
1139
1140 /* MLME */
1141 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1142                                      struct ieee80211_sub_if_data *sdata,
1143                                      u8 *wmm_param, size_t wmm_param_len)
1144 {
1145         struct ieee80211_tx_queue_params params;
1146         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1147         size_t left;
1148         int count;
1149         u8 *pos, uapsd_queues = 0;
1150
1151         if (!local->ops->conf_tx)
1152                 return false;
1153
1154         if (local->hw.queues < IEEE80211_NUM_ACS)
1155                 return false;
1156
1157         if (!wmm_param)
1158                 return false;
1159
1160         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1161                 return false;
1162
1163         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1164                 uapsd_queues = ifmgd->uapsd_queues;
1165
1166         count = wmm_param[6] & 0x0f;
1167         if (count == ifmgd->wmm_last_param_set)
1168                 return false;
1169         ifmgd->wmm_last_param_set = count;
1170
1171         pos = wmm_param + 8;
1172         left = wmm_param_len - 8;
1173
1174         memset(&params, 0, sizeof(params));
1175
1176         sdata->wmm_acm = 0;
1177         for (; left >= 4; left -= 4, pos += 4) {
1178                 int aci = (pos[0] >> 5) & 0x03;
1179                 int acm = (pos[0] >> 4) & 0x01;
1180                 bool uapsd = false;
1181                 int queue;
1182
1183                 switch (aci) {
1184                 case 1: /* AC_BK */
1185                         queue = 3;
1186                         if (acm)
1187                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1188                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1189                                 uapsd = true;
1190                         break;
1191                 case 2: /* AC_VI */
1192                         queue = 1;
1193                         if (acm)
1194                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1195                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1196                                 uapsd = true;
1197                         break;
1198                 case 3: /* AC_VO */
1199                         queue = 0;
1200                         if (acm)
1201                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1202                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1203                                 uapsd = true;
1204                         break;
1205                 case 0: /* AC_BE */
1206                 default:
1207                         queue = 2;
1208                         if (acm)
1209                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1210                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1211                                 uapsd = true;
1212                         break;
1213                 }
1214
1215                 params.aifs = pos[0] & 0x0f;
1216                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1217                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1218                 params.txop = get_unaligned_le16(pos + 2);
1219                 params.uapsd = uapsd;
1220
1221                 mlme_dbg(sdata,
1222                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1223                          queue, aci, acm,
1224                          params.aifs, params.cw_min, params.cw_max,
1225                          params.txop, params.uapsd);
1226                 sdata->tx_conf[queue] = params;
1227                 if (drv_conf_tx(local, sdata, queue, &params))
1228                         sdata_err(sdata,
1229                                   "failed to set TX queue parameters for queue %d\n",
1230                                   queue);
1231         }
1232
1233         /* enable WMM or activate new settings */
1234         sdata->vif.bss_conf.qos = true;
1235         return true;
1236 }
1237
1238 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1239 {
1240         lockdep_assert_held(&sdata->local->mtx);
1241
1242         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1243                                 IEEE80211_STA_BEACON_POLL);
1244         ieee80211_run_deferred_scan(sdata->local);
1245 }
1246
1247 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1248 {
1249         mutex_lock(&sdata->local->mtx);
1250         __ieee80211_stop_poll(sdata);
1251         mutex_unlock(&sdata->local->mtx);
1252 }
1253
1254 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1255                                            u16 capab, bool erp_valid, u8 erp)
1256 {
1257         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1258         u32 changed = 0;
1259         bool use_protection;
1260         bool use_short_preamble;
1261         bool use_short_slot;
1262
1263         if (erp_valid) {
1264                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1265                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1266         } else {
1267                 use_protection = false;
1268                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1269         }
1270
1271         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1272         if (sdata->local->oper_channel->band == IEEE80211_BAND_5GHZ)
1273                 use_short_slot = true;
1274
1275         if (use_protection != bss_conf->use_cts_prot) {
1276                 bss_conf->use_cts_prot = use_protection;
1277                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1278         }
1279
1280         if (use_short_preamble != bss_conf->use_short_preamble) {
1281                 bss_conf->use_short_preamble = use_short_preamble;
1282                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1283         }
1284
1285         if (use_short_slot != bss_conf->use_short_slot) {
1286                 bss_conf->use_short_slot = use_short_slot;
1287                 changed |= BSS_CHANGED_ERP_SLOT;
1288         }
1289
1290         return changed;
1291 }
1292
1293 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1294                                      struct cfg80211_bss *cbss,
1295                                      u32 bss_info_changed)
1296 {
1297         struct ieee80211_bss *bss = (void *)cbss->priv;
1298         struct ieee80211_local *local = sdata->local;
1299         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1300
1301         bss_info_changed |= BSS_CHANGED_ASSOC;
1302         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1303                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1304
1305         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1306                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1307
1308         sdata->u.mgd.associated = cbss;
1309         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1310
1311         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1312
1313         /* just to be sure */
1314         ieee80211_stop_poll(sdata);
1315
1316         ieee80211_led_assoc(local, 1);
1317
1318         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1319                 bss_conf->dtim_period = bss->dtim_period;
1320         else
1321                 bss_conf->dtim_period = 0;
1322
1323         bss_conf->assoc = 1;
1324
1325         /* Tell the driver to monitor connection quality (if supported) */
1326         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1327             bss_conf->cqm_rssi_thold)
1328                 bss_info_changed |= BSS_CHANGED_CQM;
1329
1330         /* Enable ARP filtering */
1331         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1332                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1333                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1334         }
1335
1336         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1337
1338         mutex_lock(&local->iflist_mtx);
1339         ieee80211_recalc_ps(local, -1);
1340         ieee80211_recalc_smps(local);
1341         mutex_unlock(&local->iflist_mtx);
1342
1343         ieee80211_recalc_ps_vif(sdata);
1344
1345         netif_tx_start_all_queues(sdata->dev);
1346         netif_carrier_on(sdata->dev);
1347 }
1348
1349 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1350                                    u16 stype, u16 reason, bool tx,
1351                                    u8 *frame_buf)
1352 {
1353         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1354         struct ieee80211_local *local = sdata->local;
1355         struct sta_info *sta;
1356         u32 changed = 0;
1357
1358         ASSERT_MGD_MTX(ifmgd);
1359
1360         if (WARN_ON_ONCE(tx && !frame_buf))
1361                 return;
1362
1363         if (WARN_ON(!ifmgd->associated))
1364                 return;
1365
1366         ieee80211_stop_poll(sdata);
1367
1368         ifmgd->associated = NULL;
1369
1370         /*
1371          * we need to commit the associated = NULL change because the
1372          * scan code uses that to determine whether this iface should
1373          * go to/wake up from powersave or not -- and could otherwise
1374          * wake the queues erroneously.
1375          */
1376         smp_mb();
1377
1378         /*
1379          * Thus, we can only afterwards stop the queues -- to account
1380          * for the case where another CPU is finishing a scan at this
1381          * time -- we don't want the scan code to enable queues.
1382          */
1383
1384         netif_tx_stop_all_queues(sdata->dev);
1385         netif_carrier_off(sdata->dev);
1386
1387         mutex_lock(&local->sta_mtx);
1388         sta = sta_info_get(sdata, ifmgd->bssid);
1389         if (sta) {
1390                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1391                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1392         }
1393         mutex_unlock(&local->sta_mtx);
1394
1395         /*
1396          * if we want to get out of ps before disassoc (why?) we have
1397          * to do it before sending disassoc, as otherwise the null-packet
1398          * won't be valid.
1399          */
1400         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1401                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1402                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1403         }
1404         local->ps_sdata = NULL;
1405
1406         /* disable per-vif ps */
1407         ieee80211_recalc_ps_vif(sdata);
1408
1409         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1410         if (tx)
1411                 drv_flush(local, false);
1412
1413         /* deauthenticate/disassociate now */
1414         if (tx || frame_buf)
1415                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1416                                                reason, tx, frame_buf);
1417
1418         /* flush out frame */
1419         if (tx)
1420                 drv_flush(local, false);
1421
1422         /* clear bssid only after building the needed mgmt frames */
1423         memset(ifmgd->bssid, 0, ETH_ALEN);
1424
1425         /* remove AP and TDLS peers */
1426         sta_info_flush(local, sdata);
1427
1428         /* finally reset all BSS / config parameters */
1429         changed |= ieee80211_reset_erp_info(sdata);
1430
1431         ieee80211_led_assoc(local, 0);
1432         changed |= BSS_CHANGED_ASSOC;
1433         sdata->vif.bss_conf.assoc = false;
1434
1435         /* on the next assoc, re-program HT parameters */
1436         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1437         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1438
1439         local->power_constr_level = 0;
1440
1441         del_timer_sync(&local->dynamic_ps_timer);
1442         cancel_work_sync(&local->dynamic_ps_enable_work);
1443
1444         /* Disable ARP filtering */
1445         if (sdata->vif.bss_conf.arp_filter_enabled) {
1446                 sdata->vif.bss_conf.arp_filter_enabled = false;
1447                 changed |= BSS_CHANGED_ARP_FILTER;
1448         }
1449
1450         sdata->vif.bss_conf.qos = false;
1451         changed |= BSS_CHANGED_QOS;
1452
1453         /* The BSSID (not really interesting) and HT changed */
1454         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1455         ieee80211_bss_info_change_notify(sdata, changed);
1456
1457         /* channel(_type) changes are handled by ieee80211_hw_config */
1458         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1459         ieee80211_hw_config(local, 0);
1460
1461         /* disassociated - set to defaults now */
1462         ieee80211_set_wmm_default(sdata, false);
1463
1464         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1465         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1466         del_timer_sync(&sdata->u.mgd.timer);
1467         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1468
1469         sdata->u.mgd.timers_running = 0;
1470 }
1471
1472 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1473                              struct ieee80211_hdr *hdr)
1474 {
1475         /*
1476          * We can postpone the mgd.timer whenever receiving unicast frames
1477          * from AP because we know that the connection is working both ways
1478          * at that time. But multicast frames (and hence also beacons) must
1479          * be ignored here, because we need to trigger the timer during
1480          * data idle periods for sending the periodic probe request to the
1481          * AP we're connected to.
1482          */
1483         if (is_multicast_ether_addr(hdr->addr1))
1484                 return;
1485
1486         ieee80211_sta_reset_conn_monitor(sdata);
1487 }
1488
1489 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1490 {
1491         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1492         struct ieee80211_local *local = sdata->local;
1493
1494         mutex_lock(&local->mtx);
1495         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1496                               IEEE80211_STA_CONNECTION_POLL))) {
1497                 mutex_unlock(&local->mtx);
1498                 return;
1499         }
1500
1501         __ieee80211_stop_poll(sdata);
1502
1503         mutex_lock(&local->iflist_mtx);
1504         ieee80211_recalc_ps(local, -1);
1505         mutex_unlock(&local->iflist_mtx);
1506
1507         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1508                 goto out;
1509
1510         /*
1511          * We've received a probe response, but are not sure whether
1512          * we have or will be receiving any beacons or data, so let's
1513          * schedule the timers again, just in case.
1514          */
1515         ieee80211_sta_reset_beacon_monitor(sdata);
1516
1517         mod_timer(&ifmgd->conn_mon_timer,
1518                   round_jiffies_up(jiffies +
1519                                    IEEE80211_CONNECTION_IDLE_TIME));
1520 out:
1521         mutex_unlock(&local->mtx);
1522 }
1523
1524 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1525                              struct ieee80211_hdr *hdr, bool ack)
1526 {
1527         if (!ieee80211_is_data(hdr->frame_control))
1528             return;
1529
1530         if (ack)
1531                 ieee80211_sta_reset_conn_monitor(sdata);
1532
1533         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1534             sdata->u.mgd.probe_send_count > 0) {
1535                 if (ack)
1536                         sdata->u.mgd.probe_send_count = 0;
1537                 else
1538                         sdata->u.mgd.nullfunc_failed = true;
1539                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1540         }
1541 }
1542
1543 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1544 {
1545         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1546         const u8 *ssid;
1547         u8 *dst = ifmgd->associated->bssid;
1548         u8 unicast_limit = max(1, max_probe_tries - 3);
1549
1550         /*
1551          * Try sending broadcast probe requests for the last three
1552          * probe requests after the first ones failed since some
1553          * buggy APs only support broadcast probe requests.
1554          */
1555         if (ifmgd->probe_send_count >= unicast_limit)
1556                 dst = NULL;
1557
1558         /*
1559          * When the hardware reports an accurate Tx ACK status, it's
1560          * better to send a nullfunc frame instead of a probe request,
1561          * as it will kick us off the AP quickly if we aren't associated
1562          * anymore. The timeout will be reset if the frame is ACKed by
1563          * the AP.
1564          */
1565         ifmgd->probe_send_count++;
1566
1567         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1568                 ifmgd->nullfunc_failed = false;
1569                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1570         } else {
1571                 int ssid_len;
1572
1573                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1574                 if (WARN_ON_ONCE(ssid == NULL))
1575                         ssid_len = 0;
1576                 else
1577                         ssid_len = ssid[1];
1578
1579                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1580                                          0, (u32) -1, true, false,
1581                                          ifmgd->associated->channel);
1582         }
1583
1584         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1585         run_again(ifmgd, ifmgd->probe_timeout);
1586         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1587                 drv_flush(sdata->local, false);
1588 }
1589
1590 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1591                                    bool beacon)
1592 {
1593         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1594         bool already = false;
1595
1596         if (!ieee80211_sdata_running(sdata))
1597                 return;
1598
1599         mutex_lock(&ifmgd->mtx);
1600
1601         if (!ifmgd->associated)
1602                 goto out;
1603
1604         mutex_lock(&sdata->local->mtx);
1605
1606         if (sdata->local->tmp_channel || sdata->local->scanning) {
1607                 mutex_unlock(&sdata->local->mtx);
1608                 goto out;
1609         }
1610
1611         if (beacon)
1612                 mlme_dbg_ratelimited(sdata,
1613                                      "detected beacon loss from AP - sending probe request\n");
1614
1615         ieee80211_cqm_rssi_notify(&sdata->vif,
1616                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1617
1618         /*
1619          * The driver/our work has already reported this event or the
1620          * connection monitoring has kicked in and we have already sent
1621          * a probe request. Or maybe the AP died and the driver keeps
1622          * reporting until we disassociate...
1623          *
1624          * In either case we have to ignore the current call to this
1625          * function (except for setting the correct probe reason bit)
1626          * because otherwise we would reset the timer every time and
1627          * never check whether we received a probe response!
1628          */
1629         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1630                             IEEE80211_STA_CONNECTION_POLL))
1631                 already = true;
1632
1633         if (beacon)
1634                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1635         else
1636                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1637
1638         mutex_unlock(&sdata->local->mtx);
1639
1640         if (already)
1641                 goto out;
1642
1643         mutex_lock(&sdata->local->iflist_mtx);
1644         ieee80211_recalc_ps(sdata->local, -1);
1645         mutex_unlock(&sdata->local->iflist_mtx);
1646
1647         ifmgd->probe_send_count = 0;
1648         ieee80211_mgd_probe_ap_send(sdata);
1649  out:
1650         mutex_unlock(&ifmgd->mtx);
1651 }
1652
1653 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1654                                           struct ieee80211_vif *vif)
1655 {
1656         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1657         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1658         struct cfg80211_bss *cbss;
1659         struct sk_buff *skb;
1660         const u8 *ssid;
1661         int ssid_len;
1662
1663         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1664                 return NULL;
1665
1666         ASSERT_MGD_MTX(ifmgd);
1667
1668         if (ifmgd->associated)
1669                 cbss = ifmgd->associated;
1670         else if (ifmgd->auth_data)
1671                 cbss = ifmgd->auth_data->bss;
1672         else if (ifmgd->assoc_data)
1673                 cbss = ifmgd->assoc_data->bss;
1674         else
1675                 return NULL;
1676
1677         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1678         if (WARN_ON_ONCE(ssid == NULL))
1679                 ssid_len = 0;
1680         else
1681                 ssid_len = ssid[1];
1682
1683         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1684                                         (u32) -1,
1685                                         sdata->local->oper_channel,
1686                                         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_disconnect(struct ieee80211_sub_if_data *sdata,
1694                                    bool transmit_frame)
1695 {
1696         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1697         struct ieee80211_local *local = sdata->local;
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         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1707                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1708                                transmit_frame, frame_buf);
1709         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1710         mutex_unlock(&ifmgd->mtx);
1711
1712         /*
1713          * must be outside lock due to cfg80211,
1714          * but that's not a problem.
1715          */
1716         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1717
1718         mutex_lock(&local->mtx);
1719         ieee80211_recalc_idle(local);
1720         mutex_unlock(&local->mtx);
1721 }
1722
1723 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1724 {
1725         struct ieee80211_sub_if_data *sdata =
1726                 container_of(work, struct ieee80211_sub_if_data,
1727                              u.mgd.beacon_connection_loss_work);
1728         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1729         struct sta_info *sta;
1730
1731         if (ifmgd->associated) {
1732                 rcu_read_lock();
1733                 sta = sta_info_get(sdata, ifmgd->bssid);
1734                 if (sta)
1735                         sta->beacon_loss_count++;
1736                 rcu_read_unlock();
1737         }
1738
1739         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) {
1740                 sdata_info(sdata, "Connection to AP %pM lost\n",
1741                            ifmgd->bssid);
1742                 __ieee80211_disconnect(sdata, false);
1743         } else {
1744                 ieee80211_mgd_probe_ap(sdata, true);
1745         }
1746 }
1747
1748 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
1749 {
1750         struct ieee80211_sub_if_data *sdata =
1751                 container_of(work, struct ieee80211_sub_if_data,
1752                              u.mgd.csa_connection_drop_work);
1753
1754         ieee80211_wake_queues_by_reason(&sdata->local->hw,
1755                                         IEEE80211_QUEUE_STOP_REASON_CSA);
1756         __ieee80211_disconnect(sdata, true);
1757 }
1758
1759 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1760 {
1761         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1762         struct ieee80211_hw *hw = &sdata->local->hw;
1763
1764         trace_api_beacon_loss(sdata);
1765
1766         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1767         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1768 }
1769 EXPORT_SYMBOL(ieee80211_beacon_loss);
1770
1771 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1772 {
1773         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1774         struct ieee80211_hw *hw = &sdata->local->hw;
1775
1776         trace_api_connection_loss(sdata);
1777
1778         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1779         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1780 }
1781 EXPORT_SYMBOL(ieee80211_connection_loss);
1782
1783
1784 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1785                                         bool assoc)
1786 {
1787         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1788
1789         lockdep_assert_held(&sdata->u.mgd.mtx);
1790
1791         if (!assoc) {
1792                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1793
1794                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1795                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1796         }
1797
1798         cfg80211_put_bss(auth_data->bss);
1799         kfree(auth_data);
1800         sdata->u.mgd.auth_data = NULL;
1801 }
1802
1803 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1804                                      struct ieee80211_mgmt *mgmt, size_t len)
1805 {
1806         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1807         u8 *pos;
1808         struct ieee802_11_elems elems;
1809
1810         pos = mgmt->u.auth.variable;
1811         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1812         if (!elems.challenge)
1813                 return;
1814         auth_data->expected_transaction = 4;
1815         drv_mgd_prepare_tx(sdata->local, sdata);
1816         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1817                             elems.challenge - 2, elems.challenge_len + 2,
1818                             auth_data->bss->bssid, auth_data->bss->bssid,
1819                             auth_data->key, auth_data->key_len,
1820                             auth_data->key_idx);
1821 }
1822
1823 static enum rx_mgmt_action __must_check
1824 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1825                        struct ieee80211_mgmt *mgmt, size_t len)
1826 {
1827         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1828         u8 bssid[ETH_ALEN];
1829         u16 auth_alg, auth_transaction, status_code;
1830         struct sta_info *sta;
1831
1832         lockdep_assert_held(&ifmgd->mtx);
1833
1834         if (len < 24 + 6)
1835                 return RX_MGMT_NONE;
1836
1837         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1838                 return RX_MGMT_NONE;
1839
1840         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1841
1842         if (!ether_addr_equal(bssid, mgmt->bssid))
1843                 return RX_MGMT_NONE;
1844
1845         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1846         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1847         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1848
1849         if (auth_alg != ifmgd->auth_data->algorithm ||
1850             auth_transaction != ifmgd->auth_data->expected_transaction)
1851                 return RX_MGMT_NONE;
1852
1853         if (status_code != WLAN_STATUS_SUCCESS) {
1854                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1855                            mgmt->sa, status_code);
1856                 ieee80211_destroy_auth_data(sdata, false);
1857                 return RX_MGMT_CFG80211_RX_AUTH;
1858         }
1859
1860         switch (ifmgd->auth_data->algorithm) {
1861         case WLAN_AUTH_OPEN:
1862         case WLAN_AUTH_LEAP:
1863         case WLAN_AUTH_FT:
1864                 break;
1865         case WLAN_AUTH_SHARED_KEY:
1866                 if (ifmgd->auth_data->expected_transaction != 4) {
1867                         ieee80211_auth_challenge(sdata, mgmt, len);
1868                         /* need another frame */
1869                         return RX_MGMT_NONE;
1870                 }
1871                 break;
1872         default:
1873                 WARN_ONCE(1, "invalid auth alg %d",
1874                           ifmgd->auth_data->algorithm);
1875                 return RX_MGMT_NONE;
1876         }
1877
1878         sdata_info(sdata, "authenticated\n");
1879         ifmgd->auth_data->done = true;
1880         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1881         run_again(ifmgd, ifmgd->auth_data->timeout);
1882
1883         /* move station state to auth */
1884         mutex_lock(&sdata->local->sta_mtx);
1885         sta = sta_info_get(sdata, bssid);
1886         if (!sta) {
1887                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1888                 goto out_err;
1889         }
1890         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1891                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1892                 goto out_err;
1893         }
1894         mutex_unlock(&sdata->local->sta_mtx);
1895
1896         return RX_MGMT_CFG80211_RX_AUTH;
1897  out_err:
1898         mutex_unlock(&sdata->local->sta_mtx);
1899         /* ignore frame -- wait for timeout */
1900         return RX_MGMT_NONE;
1901 }
1902
1903
1904 static enum rx_mgmt_action __must_check
1905 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1906                          struct ieee80211_mgmt *mgmt, size_t len)
1907 {
1908         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1909         const u8 *bssid = NULL;
1910         u16 reason_code;
1911
1912         lockdep_assert_held(&ifmgd->mtx);
1913
1914         if (len < 24 + 2)
1915                 return RX_MGMT_NONE;
1916
1917         if (!ifmgd->associated ||
1918             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1919                 return RX_MGMT_NONE;
1920
1921         bssid = ifmgd->associated->bssid;
1922
1923         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1924
1925         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1926                    bssid, reason_code);
1927
1928         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1929
1930         mutex_lock(&sdata->local->mtx);
1931         ieee80211_recalc_idle(sdata->local);
1932         mutex_unlock(&sdata->local->mtx);
1933
1934         return RX_MGMT_CFG80211_DEAUTH;
1935 }
1936
1937
1938 static enum rx_mgmt_action __must_check
1939 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1940                            struct ieee80211_mgmt *mgmt, size_t len)
1941 {
1942         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1943         u16 reason_code;
1944
1945         lockdep_assert_held(&ifmgd->mtx);
1946
1947         if (len < 24 + 2)
1948                 return RX_MGMT_NONE;
1949
1950         if (!ifmgd->associated ||
1951             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1952                 return RX_MGMT_NONE;
1953
1954         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1955
1956         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1957                    mgmt->sa, reason_code);
1958
1959         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1960
1961         mutex_lock(&sdata->local->mtx);
1962         ieee80211_recalc_idle(sdata->local);
1963         mutex_unlock(&sdata->local->mtx);
1964
1965         return RX_MGMT_CFG80211_DISASSOC;
1966 }
1967
1968 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1969                                 u8 *supp_rates, unsigned int supp_rates_len,
1970                                 u32 *rates, u32 *basic_rates,
1971                                 bool *have_higher_than_11mbit,
1972                                 int *min_rate, int *min_rate_index)
1973 {
1974         int i, j;
1975
1976         for (i = 0; i < supp_rates_len; i++) {
1977                 int rate = (supp_rates[i] & 0x7f) * 5;
1978                 bool is_basic = !!(supp_rates[i] & 0x80);
1979
1980                 if (rate > 110)
1981                         *have_higher_than_11mbit = true;
1982
1983                 /*
1984                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1985                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1986                  *
1987                  * Note: Even through the membership selector and the basic
1988                  *       rate flag share the same bit, they are not exactly
1989                  *       the same.
1990                  */
1991                 if (!!(supp_rates[i] & 0x80) &&
1992                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1993                         continue;
1994
1995                 for (j = 0; j < sband->n_bitrates; j++) {
1996                         if (sband->bitrates[j].bitrate == rate) {
1997                                 *rates |= BIT(j);
1998                                 if (is_basic)
1999                                         *basic_rates |= BIT(j);
2000                                 if (rate < *min_rate) {
2001                                         *min_rate = rate;
2002                                         *min_rate_index = j;
2003                                 }
2004                                 break;
2005                         }
2006                 }
2007         }
2008 }
2009
2010 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2011                                          bool assoc)
2012 {
2013         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2014
2015         lockdep_assert_held(&sdata->u.mgd.mtx);
2016
2017         if (!assoc) {
2018                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2019
2020                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2021                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2022         }
2023
2024         kfree(assoc_data);
2025         sdata->u.mgd.assoc_data = NULL;
2026 }
2027
2028 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2029                                     struct cfg80211_bss *cbss,
2030                                     struct ieee80211_mgmt *mgmt, size_t len)
2031 {
2032         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2033         struct ieee80211_local *local = sdata->local;
2034         struct ieee80211_supported_band *sband;
2035         struct sta_info *sta;
2036         u8 *pos;
2037         u16 capab_info, aid;
2038         struct ieee802_11_elems elems;
2039         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2040         u32 changed = 0;
2041         int err;
2042
2043         /* AssocResp and ReassocResp have identical structure */
2044
2045         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2046         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2047
2048         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2049                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2050                            aid);
2051         aid &= ~(BIT(15) | BIT(14));
2052
2053         ifmgd->broken_ap = false;
2054
2055         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2056                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2057                            aid);
2058                 aid = 0;
2059                 ifmgd->broken_ap = true;
2060         }
2061
2062         pos = mgmt->u.assoc_resp.variable;
2063         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2064
2065         if (!elems.supp_rates) {
2066                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2067                 return false;
2068         }
2069
2070         ifmgd->aid = aid;
2071
2072         mutex_lock(&sdata->local->sta_mtx);
2073         /*
2074          * station info was already allocated and inserted before
2075          * the association and should be available to us
2076          */
2077         sta = sta_info_get(sdata, cbss->bssid);
2078         if (WARN_ON(!sta)) {
2079                 mutex_unlock(&sdata->local->sta_mtx);
2080                 return false;
2081         }
2082
2083         sband = local->hw.wiphy->bands[local->oper_channel->band];
2084
2085         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2086                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2087                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2088
2089         sta->supports_40mhz =
2090                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2091
2092         rate_control_rate_init(sta);
2093
2094         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2095                 set_sta_flag(sta, WLAN_STA_MFP);
2096
2097         if (elems.wmm_param)
2098                 set_sta_flag(sta, WLAN_STA_WME);
2099
2100         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2101         if (!err)
2102                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2103         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2104                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2105         if (err) {
2106                 sdata_info(sdata,
2107                            "failed to move station %pM to desired state\n",
2108                            sta->sta.addr);
2109                 WARN_ON(__sta_info_destroy(sta));
2110                 mutex_unlock(&sdata->local->sta_mtx);
2111                 return false;
2112         }
2113
2114         mutex_unlock(&sdata->local->sta_mtx);
2115
2116         /*
2117          * Always handle WMM once after association regardless
2118          * of the first value the AP uses. Setting -1 here has
2119          * that effect because the AP values is an unsigned
2120          * 4-bit value.
2121          */
2122         ifmgd->wmm_last_param_set = -1;
2123
2124         if (elems.wmm_param)
2125                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2126                                          elems.wmm_param_len);
2127         else
2128                 ieee80211_set_wmm_default(sdata, false);
2129         changed |= BSS_CHANGED_QOS;
2130
2131         if (elems.ht_operation && elems.wmm_param &&
2132             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2133                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2134                                                   cbss->bssid, false);
2135
2136         /* set AID and assoc capability,
2137          * ieee80211_set_associated() will tell the driver */
2138         bss_conf->aid = aid;
2139         bss_conf->assoc_capability = capab_info;
2140         ieee80211_set_associated(sdata, cbss, changed);
2141
2142         /*
2143          * If we're using 4-addr mode, let the AP know that we're
2144          * doing so, so that it can create the STA VLAN on its side
2145          */
2146         if (ifmgd->use_4addr)
2147                 ieee80211_send_4addr_nullfunc(local, sdata);
2148
2149         /*
2150          * Start timer to probe the connection to the AP now.
2151          * Also start the timer that will detect beacon loss.
2152          */
2153         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2154         ieee80211_sta_reset_beacon_monitor(sdata);
2155
2156         return true;
2157 }
2158
2159 static enum rx_mgmt_action __must_check
2160 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2161                              struct ieee80211_mgmt *mgmt, size_t len,
2162                              struct cfg80211_bss **bss)
2163 {
2164         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2165         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2166         u16 capab_info, status_code, aid;
2167         struct ieee802_11_elems elems;
2168         u8 *pos;
2169         bool reassoc;
2170
2171         lockdep_assert_held(&ifmgd->mtx);
2172
2173         if (!assoc_data)
2174                 return RX_MGMT_NONE;
2175         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2176                 return RX_MGMT_NONE;
2177
2178         /*
2179          * AssocResp and ReassocResp have identical structure, so process both
2180          * of them in this function.
2181          */
2182
2183         if (len < 24 + 6)
2184                 return RX_MGMT_NONE;
2185
2186         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2187         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2188         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2189         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2190
2191         sdata_info(sdata,
2192                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2193                    reassoc ? "Rea" : "A", mgmt->sa,
2194                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2195
2196         pos = mgmt->u.assoc_resp.variable;
2197         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2198
2199         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2200             elems.timeout_int && elems.timeout_int_len == 5 &&
2201             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2202                 u32 tu, ms;
2203                 tu = get_unaligned_le32(elems.timeout_int + 1);
2204                 ms = tu * 1024 / 1000;
2205                 sdata_info(sdata,
2206                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2207                            mgmt->sa, tu, ms);
2208                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2209                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2210                         run_again(ifmgd, assoc_data->timeout);
2211                 return RX_MGMT_NONE;
2212         }
2213
2214         *bss = assoc_data->bss;
2215
2216         if (status_code != WLAN_STATUS_SUCCESS) {
2217                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2218                            mgmt->sa, status_code);
2219                 ieee80211_destroy_assoc_data(sdata, false);
2220         } else {
2221                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2222                         /* oops -- internal error -- send timeout for now */
2223                         ieee80211_destroy_assoc_data(sdata, false);
2224                         cfg80211_put_bss(*bss);
2225                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2226                 }
2227                 sdata_info(sdata, "associated\n");
2228
2229                 /*
2230                  * destroy assoc_data afterwards, as otherwise an idle
2231                  * recalc after assoc_data is NULL but before associated
2232                  * is set can cause the interface to go idle
2233                  */
2234                 ieee80211_destroy_assoc_data(sdata, true);
2235         }
2236
2237         return RX_MGMT_CFG80211_RX_ASSOC;
2238 }
2239 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2240                                   struct ieee80211_mgmt *mgmt,
2241                                   size_t len,
2242                                   struct ieee80211_rx_status *rx_status,
2243                                   struct ieee802_11_elems *elems,
2244                                   bool beacon)
2245 {
2246         struct ieee80211_local *local = sdata->local;
2247         int freq;
2248         struct ieee80211_bss *bss;
2249         struct ieee80211_channel *channel;
2250         bool need_ps = false;
2251
2252         if (sdata->u.mgd.associated &&
2253             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2254                 bss = (void *)sdata->u.mgd.associated->priv;
2255                 /* not previously set so we may need to recalc */
2256                 need_ps = !bss->dtim_period;
2257         }
2258
2259         if (elems->ds_params && elems->ds_params_len == 1)
2260                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2261                                                       rx_status->band);
2262         else
2263                 freq = rx_status->freq;
2264
2265         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2266
2267         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2268                 return;
2269
2270         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2271                                         channel, beacon);
2272         if (bss)
2273                 ieee80211_rx_bss_put(local, bss);
2274
2275         if (!sdata->u.mgd.associated)
2276                 return;
2277
2278         if (need_ps) {
2279                 mutex_lock(&local->iflist_mtx);
2280                 ieee80211_recalc_ps(local, -1);
2281                 mutex_unlock(&local->iflist_mtx);
2282         }
2283
2284         if (elems->ch_switch_ie &&
2285             memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2286                 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2287                                                  bss, rx_status->mactime);
2288 }
2289
2290
2291 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2292                                          struct sk_buff *skb)
2293 {
2294         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2295         struct ieee80211_if_managed *ifmgd;
2296         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2297         size_t baselen, len = skb->len;
2298         struct ieee802_11_elems elems;
2299
2300         ifmgd = &sdata->u.mgd;
2301
2302         ASSERT_MGD_MTX(ifmgd);
2303
2304         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2305                 return; /* ignore ProbeResp to foreign address */
2306
2307         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2308         if (baselen > len)
2309                 return;
2310
2311         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2312                                 &elems);
2313
2314         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2315
2316         if (ifmgd->associated &&
2317             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2318                 ieee80211_reset_ap_probe(sdata);
2319
2320         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2321             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2322                 /* got probe response, continue with auth */
2323                 sdata_info(sdata, "direct probe responded\n");
2324                 ifmgd->auth_data->tries = 0;
2325                 ifmgd->auth_data->timeout = jiffies;
2326                 run_again(ifmgd, ifmgd->auth_data->timeout);
2327         }
2328 }
2329
2330 /*
2331  * This is the canonical list of information elements we care about,
2332  * the filter code also gives us all changes to the Microsoft OUI
2333  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2334  *
2335  * We implement beacon filtering in software since that means we can
2336  * avoid processing the frame here and in cfg80211, and userspace
2337  * will not be able to tell whether the hardware supports it or not.
2338  *
2339  * XXX: This list needs to be dynamic -- userspace needs to be able to
2340  *      add items it requires. It also needs to be able to tell us to
2341  *      look out for other vendor IEs.
2342  */
2343 static const u64 care_about_ies =
2344         (1ULL << WLAN_EID_COUNTRY) |
2345         (1ULL << WLAN_EID_ERP_INFO) |
2346         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2347         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2348         (1ULL << WLAN_EID_HT_CAPABILITY) |
2349         (1ULL << WLAN_EID_HT_OPERATION);
2350
2351 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2352                                      struct ieee80211_mgmt *mgmt,
2353                                      size_t len,
2354                                      struct ieee80211_rx_status *rx_status)
2355 {
2356         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2357         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2358         size_t baselen;
2359         struct ieee802_11_elems elems;
2360         struct ieee80211_local *local = sdata->local;
2361         u32 changed = 0;
2362         bool erp_valid, directed_tim = false;
2363         u8 erp_value = 0;
2364         u32 ncrc;
2365         u8 *bssid;
2366
2367         lockdep_assert_held(&ifmgd->mtx);
2368
2369         /* Process beacon from the current BSS */
2370         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2371         if (baselen > len)
2372                 return;
2373
2374         if (rx_status->freq != local->oper_channel->center_freq)
2375                 return;
2376
2377         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2378             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2379                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2380                                        len - baselen, &elems);
2381
2382                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2383                                       false);
2384                 ifmgd->assoc_data->have_beacon = true;
2385                 ifmgd->assoc_data->sent_assoc = false;
2386                 /* continue assoc process */
2387                 ifmgd->assoc_data->timeout = jiffies;
2388                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2389                 return;
2390         }
2391
2392         if (!ifmgd->associated ||
2393             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2394                 return;
2395         bssid = ifmgd->associated->bssid;
2396
2397         /* Track average RSSI from the Beacon frames of the current AP */
2398         ifmgd->last_beacon_signal = rx_status->signal;
2399         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2400                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2401                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2402                 ifmgd->last_cqm_event_signal = 0;
2403                 ifmgd->count_beacon_signal = 1;
2404                 ifmgd->last_ave_beacon_signal = 0;
2405         } else {
2406                 ifmgd->ave_beacon_signal =
2407                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2408                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2409                          ifmgd->ave_beacon_signal) / 16;
2410                 ifmgd->count_beacon_signal++;
2411         }
2412
2413         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2414             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2415                 int sig = ifmgd->ave_beacon_signal;
2416                 int last_sig = ifmgd->last_ave_beacon_signal;
2417
2418                 /*
2419                  * if signal crosses either of the boundaries, invoke callback
2420                  * with appropriate parameters
2421                  */
2422                 if (sig > ifmgd->rssi_max_thold &&
2423                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2424                         ifmgd->last_ave_beacon_signal = sig;
2425                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2426                 } else if (sig < ifmgd->rssi_min_thold &&
2427                            (last_sig >= ifmgd->rssi_max_thold ||
2428                            last_sig == 0)) {
2429                         ifmgd->last_ave_beacon_signal = sig;
2430                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2431                 }
2432         }
2433
2434         if (bss_conf->cqm_rssi_thold &&
2435             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2436             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2437                 int sig = ifmgd->ave_beacon_signal / 16;
2438                 int last_event = ifmgd->last_cqm_event_signal;
2439                 int thold = bss_conf->cqm_rssi_thold;
2440                 int hyst = bss_conf->cqm_rssi_hyst;
2441                 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_LOW,
2447                                 GFP_KERNEL);
2448                 } else if (sig > thold &&
2449                            (last_event == 0 || sig > last_event + hyst)) {
2450                         ifmgd->last_cqm_event_signal = sig;
2451                         ieee80211_cqm_rssi_notify(
2452                                 &sdata->vif,
2453                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2454                                 GFP_KERNEL);
2455                 }
2456         }
2457
2458         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2459                 mlme_dbg_ratelimited(sdata,
2460                                      "cancelling probereq poll due to a received beacon\n");
2461                 mutex_lock(&local->mtx);
2462                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2463                 ieee80211_run_deferred_scan(local);
2464                 mutex_unlock(&local->mtx);
2465
2466                 mutex_lock(&local->iflist_mtx);
2467                 ieee80211_recalc_ps(local, -1);
2468                 mutex_unlock(&local->iflist_mtx);
2469         }
2470
2471         /*
2472          * Push the beacon loss detection into the future since
2473          * we are processing a beacon from the AP just now.
2474          */
2475         ieee80211_sta_reset_beacon_monitor(sdata);
2476
2477         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2478         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2479                                           len - baselen, &elems,
2480                                           care_about_ies, ncrc);
2481
2482         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2483                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2484                                                    ifmgd->aid);
2485
2486         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2487                 if (directed_tim) {
2488                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2489                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2490                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2491                                         ieee80211_hw_config(local,
2492                                                             IEEE80211_CONF_CHANGE_PS);
2493                                 }
2494                                 ieee80211_send_nullfunc(local, sdata, 0);
2495                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2496                                 local->pspolling = true;
2497
2498                                 /*
2499                                  * Here is assumed that the driver will be
2500                                  * able to send ps-poll frame and receive a
2501                                  * response even though power save mode is
2502                                  * enabled, but some drivers might require
2503                                  * to disable power save here. This needs
2504                                  * to be investigated.
2505                                  */
2506                                 ieee80211_send_pspoll(local, sdata);
2507                         }
2508                 }
2509         }
2510
2511         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2512                 return;
2513         ifmgd->beacon_crc = ncrc;
2514         ifmgd->beacon_crc_valid = true;
2515
2516         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2517                               true);
2518
2519         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2520                                      elems.wmm_param_len))
2521                 changed |= BSS_CHANGED_QOS;
2522
2523         if (elems.erp_info && elems.erp_info_len >= 1) {
2524                 erp_valid = true;
2525                 erp_value = elems.erp_info[0];
2526         } else {
2527                 erp_valid = false;
2528         }
2529         changed |= ieee80211_handle_bss_capability(sdata,
2530                         le16_to_cpu(mgmt->u.beacon.capab_info),
2531                         erp_valid, erp_value);
2532
2533
2534         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2535             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2536                 struct ieee80211_supported_band *sband;
2537
2538                 sband = local->hw.wiphy->bands[local->oper_channel->band];
2539
2540                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2541                                                   bssid, true);
2542         }
2543
2544         /* Note: country IE parsing is done for us by cfg80211 */
2545         if (elems.country_elem) {
2546                 /* TODO: IBSS also needs this */
2547                 if (elems.pwr_constr_elem)
2548                         ieee80211_handle_pwr_constr(sdata,
2549                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2550                                 elems.pwr_constr_elem);
2551         }
2552
2553         ieee80211_bss_info_change_notify(sdata, changed);
2554 }
2555
2556 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2557                                   struct sk_buff *skb)
2558 {
2559         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2560         struct ieee80211_rx_status *rx_status;
2561         struct ieee80211_mgmt *mgmt;
2562         struct cfg80211_bss *bss = NULL;
2563         enum rx_mgmt_action rma = RX_MGMT_NONE;
2564         u16 fc;
2565
2566         rx_status = (struct ieee80211_rx_status *) skb->cb;
2567         mgmt = (struct ieee80211_mgmt *) skb->data;
2568         fc = le16_to_cpu(mgmt->frame_control);
2569
2570         mutex_lock(&ifmgd->mtx);
2571
2572         switch (fc & IEEE80211_FCTL_STYPE) {
2573         case IEEE80211_STYPE_BEACON:
2574                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2575                 break;
2576         case IEEE80211_STYPE_PROBE_RESP:
2577                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2578                 break;
2579         case IEEE80211_STYPE_AUTH:
2580                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2581                 break;
2582         case IEEE80211_STYPE_DEAUTH:
2583                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2584                 break;
2585         case IEEE80211_STYPE_DISASSOC:
2586                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2587                 break;
2588         case IEEE80211_STYPE_ASSOC_RESP:
2589         case IEEE80211_STYPE_REASSOC_RESP:
2590                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2591                 break;
2592         case IEEE80211_STYPE_ACTION:
2593                 switch (mgmt->u.action.category) {
2594                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2595                         ieee80211_sta_process_chanswitch(sdata,
2596                                         &mgmt->u.action.u.chan_switch.sw_elem,
2597                                         (void *)ifmgd->associated->priv,
2598                                         rx_status->mactime);
2599                         break;
2600                 }
2601         }
2602         mutex_unlock(&ifmgd->mtx);
2603
2604         switch (rma) {
2605         case RX_MGMT_NONE:
2606                 /* no action */
2607                 break;
2608         case RX_MGMT_CFG80211_DEAUTH:
2609                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2610                 break;
2611         case RX_MGMT_CFG80211_DISASSOC:
2612                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2613                 break;
2614         case RX_MGMT_CFG80211_RX_AUTH:
2615                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2616                 break;
2617         case RX_MGMT_CFG80211_RX_ASSOC:
2618                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2619                 break;
2620         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2621                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2622                 break;
2623         default:
2624                 WARN(1, "unexpected: %d", rma);
2625         }
2626 }
2627
2628 static void ieee80211_sta_timer(unsigned long data)
2629 {
2630         struct ieee80211_sub_if_data *sdata =
2631                 (struct ieee80211_sub_if_data *) data;
2632         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2633         struct ieee80211_local *local = sdata->local;
2634
2635         if (local->quiescing) {
2636                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2637                 return;
2638         }
2639
2640         ieee80211_queue_work(&local->hw, &sdata->work);
2641 }
2642
2643 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2644                                           u8 *bssid, u8 reason)
2645 {
2646         struct ieee80211_local *local = sdata->local;
2647         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2648         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2649
2650         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2651                                false, frame_buf);
2652         mutex_unlock(&ifmgd->mtx);
2653
2654         /*
2655          * must be outside lock due to cfg80211,
2656          * but that's not a problem.
2657          */
2658         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2659
2660         mutex_lock(&local->mtx);
2661         ieee80211_recalc_idle(local);
2662         mutex_unlock(&local->mtx);
2663
2664         mutex_lock(&ifmgd->mtx);
2665 }
2666
2667 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2668 {
2669         struct ieee80211_local *local = sdata->local;
2670         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2671         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2672
2673         lockdep_assert_held(&ifmgd->mtx);
2674
2675         if (WARN_ON_ONCE(!auth_data))
2676                 return -EINVAL;
2677
2678         auth_data->tries++;
2679
2680         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2681                 sdata_info(sdata, "authentication with %pM timed out\n",
2682                            auth_data->bss->bssid);
2683
2684                 /*
2685                  * Most likely AP is not in the range so remove the
2686                  * bss struct for that AP.
2687                  */
2688                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2689
2690                 return -ETIMEDOUT;
2691         }
2692
2693         drv_mgd_prepare_tx(local, sdata);
2694
2695         if (auth_data->bss->proberesp_ies) {
2696                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2697                            auth_data->bss->bssid, auth_data->tries,
2698                            IEEE80211_AUTH_MAX_TRIES);
2699
2700                 auth_data->expected_transaction = 2;
2701                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2702                                     auth_data->ie, auth_data->ie_len,
2703                                     auth_data->bss->bssid,
2704                                     auth_data->bss->bssid, NULL, 0, 0);
2705         } else {
2706                 const u8 *ssidie;
2707
2708                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2709                            auth_data->bss->bssid, auth_data->tries,
2710                            IEEE80211_AUTH_MAX_TRIES);
2711
2712                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2713                 if (!ssidie)
2714                         return -EINVAL;
2715                 /*
2716                  * Direct probe is sent to broadcast address as some APs
2717                  * will not answer to direct packet in unassociated state.
2718                  */
2719                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2720                                          NULL, 0, (u32) -1, true, false,
2721                                          auth_data->bss->channel);
2722         }
2723
2724         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2725         run_again(ifmgd, auth_data->timeout);
2726
2727         return 0;
2728 }
2729
2730 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2731 {
2732         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2733         struct ieee80211_local *local = sdata->local;
2734
2735         lockdep_assert_held(&sdata->u.mgd.mtx);
2736
2737         assoc_data->tries++;
2738         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2739                 sdata_info(sdata, "association with %pM timed out\n",
2740                            assoc_data->bss->bssid);
2741
2742                 /*
2743                  * Most likely AP is not in the range so remove the
2744                  * bss struct for that AP.
2745                  */
2746                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2747
2748                 return -ETIMEDOUT;
2749         }
2750
2751         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2752                    assoc_data->bss->bssid, assoc_data->tries,
2753                    IEEE80211_ASSOC_MAX_TRIES);
2754         ieee80211_send_assoc(sdata);
2755
2756         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2757         run_again(&sdata->u.mgd, assoc_data->timeout);
2758
2759         return 0;
2760 }
2761
2762 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2763 {
2764         struct ieee80211_local *local = sdata->local;
2765         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2766
2767         mutex_lock(&ifmgd->mtx);
2768
2769         if (ifmgd->auth_data &&
2770             time_after(jiffies, ifmgd->auth_data->timeout)) {
2771                 if (ifmgd->auth_data->done) {
2772                         /*
2773                          * ok ... we waited for assoc but userspace didn't,
2774                          * so let's just kill the auth data
2775                          */
2776                         ieee80211_destroy_auth_data(sdata, false);
2777                 } else if (ieee80211_probe_auth(sdata)) {
2778                         u8 bssid[ETH_ALEN];
2779
2780                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2781
2782                         ieee80211_destroy_auth_data(sdata, false);
2783
2784                         mutex_unlock(&ifmgd->mtx);
2785                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2786                         mutex_lock(&ifmgd->mtx);
2787                 }
2788         } else if (ifmgd->auth_data)
2789                 run_again(ifmgd, ifmgd->auth_data->timeout);
2790
2791         if (ifmgd->assoc_data &&
2792             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2793                 if (!ifmgd->assoc_data->have_beacon ||
2794                     ieee80211_do_assoc(sdata)) {
2795                         u8 bssid[ETH_ALEN];
2796
2797                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2798
2799                         ieee80211_destroy_assoc_data(sdata, false);
2800
2801                         mutex_unlock(&ifmgd->mtx);
2802                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2803                         mutex_lock(&ifmgd->mtx);
2804                 }
2805         } else if (ifmgd->assoc_data)
2806                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2807
2808         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2809                             IEEE80211_STA_CONNECTION_POLL) &&
2810             ifmgd->associated) {
2811                 u8 bssid[ETH_ALEN];
2812                 int max_tries;
2813
2814                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2815
2816                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2817                         max_tries = max_nullfunc_tries;
2818                 else
2819                         max_tries = max_probe_tries;
2820
2821                 /* ACK received for nullfunc probing frame */
2822                 if (!ifmgd->probe_send_count)
2823                         ieee80211_reset_ap_probe(sdata);
2824                 else if (ifmgd->nullfunc_failed) {
2825                         if (ifmgd->probe_send_count < max_tries) {
2826                                 mlme_dbg(sdata,
2827                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2828                                          bssid, ifmgd->probe_send_count,
2829                                          max_tries);
2830                                 ieee80211_mgd_probe_ap_send(sdata);
2831                         } else {
2832                                 mlme_dbg(sdata,
2833                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2834                                          bssid);
2835                                 ieee80211_sta_connection_lost(sdata, bssid,
2836                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2837                         }
2838                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2839                         run_again(ifmgd, ifmgd->probe_timeout);
2840                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2841                         mlme_dbg(sdata,
2842                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2843                                  bssid, probe_wait_ms);
2844                         ieee80211_sta_connection_lost(sdata, bssid,
2845                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2846                 } else if (ifmgd->probe_send_count < max_tries) {
2847                         mlme_dbg(sdata,
2848                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2849                                  bssid, probe_wait_ms,
2850                                  ifmgd->probe_send_count, max_tries);
2851                         ieee80211_mgd_probe_ap_send(sdata);
2852                 } else {
2853                         /*
2854                          * We actually lost the connection ... or did we?
2855                          * Let's make sure!
2856                          */
2857                         wiphy_debug(local->hw.wiphy,
2858                                     "%s: No probe response from AP %pM"
2859                                     " after %dms, disconnecting.\n",
2860                                     sdata->name,
2861                                     bssid, probe_wait_ms);
2862
2863                         ieee80211_sta_connection_lost(sdata, bssid,
2864                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2865                 }
2866         }
2867
2868         mutex_unlock(&ifmgd->mtx);
2869
2870         mutex_lock(&local->mtx);
2871         ieee80211_recalc_idle(local);
2872         mutex_unlock(&local->mtx);
2873 }
2874
2875 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2876 {
2877         struct ieee80211_sub_if_data *sdata =
2878                 (struct ieee80211_sub_if_data *) data;
2879         struct ieee80211_local *local = sdata->local;
2880
2881         if (local->quiescing)
2882                 return;
2883
2884         ieee80211_queue_work(&sdata->local->hw,
2885                              &sdata->u.mgd.beacon_connection_loss_work);
2886 }
2887
2888 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2889 {
2890         struct ieee80211_sub_if_data *sdata =
2891                 (struct ieee80211_sub_if_data *) data;
2892         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2893         struct ieee80211_local *local = sdata->local;
2894
2895         if (local->quiescing)
2896                 return;
2897
2898         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2899 }
2900
2901 static void ieee80211_sta_monitor_work(struct work_struct *work)
2902 {
2903         struct ieee80211_sub_if_data *sdata =
2904                 container_of(work, struct ieee80211_sub_if_data,
2905                              u.mgd.monitor_work);
2906
2907         ieee80211_mgd_probe_ap(sdata, false);
2908 }
2909
2910 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2911 {
2912         u32 flags;
2913
2914         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2915                 __ieee80211_stop_poll(sdata);
2916
2917                 /* let's probe the connection once */
2918                 flags = sdata->local->hw.flags;
2919                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2920                         ieee80211_queue_work(&sdata->local->hw,
2921                                              &sdata->u.mgd.monitor_work);
2922                 /* and do all the other regular work too */
2923                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2924         }
2925 }
2926
2927 #ifdef CONFIG_PM
2928 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2929 {
2930         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2931
2932         /*
2933          * we need to use atomic bitops for the running bits
2934          * only because both timers might fire at the same
2935          * time -- the code here is properly synchronised.
2936          */
2937
2938         cancel_work_sync(&ifmgd->request_smps_work);
2939
2940         cancel_work_sync(&ifmgd->monitor_work);
2941         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2942         cancel_work_sync(&ifmgd->csa_connection_drop_work);
2943         if (del_timer_sync(&ifmgd->timer))
2944                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2945
2946         cancel_work_sync(&ifmgd->chswitch_work);
2947         if (del_timer_sync(&ifmgd->chswitch_timer))
2948                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2949
2950         /* these will just be re-established on connection */
2951         del_timer_sync(&ifmgd->conn_mon_timer);
2952         del_timer_sync(&ifmgd->bcn_mon_timer);
2953 }
2954
2955 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2956 {
2957         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2958
2959         if (!ifmgd->associated)
2960                 return;
2961
2962         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2963                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2964                 mutex_lock(&ifmgd->mtx);
2965                 if (ifmgd->associated) {
2966                         mlme_dbg(sdata,
2967                                  "driver requested disconnect after resume\n");
2968                         ieee80211_sta_connection_lost(sdata,
2969                                 ifmgd->associated->bssid,
2970                                 WLAN_REASON_UNSPECIFIED);
2971                         mutex_unlock(&ifmgd->mtx);
2972                         return;
2973                 }
2974                 mutex_unlock(&ifmgd->mtx);
2975         }
2976
2977         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2978                 add_timer(&ifmgd->timer);
2979         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2980                 add_timer(&ifmgd->chswitch_timer);
2981         ieee80211_sta_reset_beacon_monitor(sdata);
2982
2983         mutex_lock(&sdata->local->mtx);
2984         ieee80211_restart_sta_timer(sdata);
2985         mutex_unlock(&sdata->local->mtx);
2986 }
2987 #endif
2988
2989 /* interface setup */
2990 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2991 {
2992         struct ieee80211_if_managed *ifmgd;
2993
2994         ifmgd = &sdata->u.mgd;
2995         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2996         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2997         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2998                   ieee80211_beacon_connection_loss_work);
2999         INIT_WORK(&ifmgd->csa_connection_drop_work,
3000                   ieee80211_csa_connection_drop_work);
3001         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3002         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3003                     (unsigned long) sdata);
3004         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3005                     (unsigned long) sdata);
3006         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3007                     (unsigned long) sdata);
3008         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3009                     (unsigned long) sdata);
3010
3011         ifmgd->flags = 0;
3012         ifmgd->powersave = sdata->wdev.ps;
3013         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3014         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3015
3016         mutex_init(&ifmgd->mtx);
3017
3018         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3019                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3020         else
3021                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3022 }
3023
3024 /* scan finished notification */
3025 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3026 {
3027         struct ieee80211_sub_if_data *sdata;
3028
3029         /* Restart STA timers */
3030         rcu_read_lock();
3031         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3032                 ieee80211_restart_sta_timer(sdata);
3033         rcu_read_unlock();
3034 }
3035
3036 int ieee80211_max_network_latency(struct notifier_block *nb,
3037                                   unsigned long data, void *dummy)
3038 {
3039         s32 latency_usec = (s32) data;
3040         struct ieee80211_local *local =
3041                 container_of(nb, struct ieee80211_local,
3042                              network_latency_notifier);
3043
3044         mutex_lock(&local->iflist_mtx);
3045         ieee80211_recalc_ps(local, latency_usec);
3046         mutex_unlock(&local->iflist_mtx);
3047
3048         return 0;
3049 }
3050
3051 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3052                                   struct cfg80211_bss *cbss)
3053 {
3054         struct ieee80211_local *local = sdata->local;
3055         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3056         int ht_cfreq;
3057         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3058         const u8 *ht_oper_ie;
3059         const struct ieee80211_ht_operation *ht_oper = NULL;
3060         struct ieee80211_supported_band *sband;
3061
3062         sband = local->hw.wiphy->bands[cbss->channel->band];
3063
3064         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3065
3066         if (sband->ht_cap.ht_supported) {
3067                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3068                                               cbss->information_elements,
3069                                               cbss->len_information_elements);
3070                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3071                         ht_oper = (void *)(ht_oper_ie + 2);
3072         }
3073
3074         if (ht_oper) {
3075                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3076                                                           cbss->channel->band);
3077                 /* check that channel matches the right operating channel */
3078                 if (cbss->channel->center_freq != ht_cfreq) {
3079                         /*
3080                          * It's possible that some APs are confused here;
3081                          * Netgear WNDR3700 sometimes reports 4 higher than
3082                          * the actual channel in association responses, but
3083                          * since we look at probe response/beacon data here
3084                          * it should be OK.
3085                          */
3086                         sdata_info(sdata,
3087                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3088                                    cbss->channel->center_freq,
3089                                    ht_cfreq, ht_oper->primary_chan,
3090                                    cbss->channel->band);
3091                         ht_oper = NULL;
3092                 }
3093         }
3094
3095         if (ht_oper) {
3096                 channel_type = NL80211_CHAN_HT20;
3097
3098                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3099                         switch (ht_oper->ht_param &
3100                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3101                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3102                                 channel_type = NL80211_CHAN_HT40PLUS;
3103                                 break;
3104                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3105                                 channel_type = NL80211_CHAN_HT40MINUS;
3106                                 break;
3107                         }
3108                 }
3109         }
3110
3111         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3112                 /* can only fail due to HT40+/- mismatch */
3113                 channel_type = NL80211_CHAN_HT20;
3114                 sdata_info(sdata,
3115                            "disabling 40 MHz due to multi-vif mismatch\n");
3116                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3117                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3118                                                     channel_type));
3119         }
3120
3121         local->oper_channel = cbss->channel;
3122         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3123
3124         return 0;
3125 }
3126
3127 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3128                                      struct cfg80211_bss *cbss, bool assoc)
3129 {
3130         struct ieee80211_local *local = sdata->local;
3131         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3132         struct ieee80211_bss *bss = (void *)cbss->priv;
3133         struct sta_info *new_sta = NULL;
3134         bool have_sta = false;
3135         int err;
3136
3137         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3138                 return -EINVAL;
3139
3140         if (assoc) {
3141                 rcu_read_lock();
3142                 have_sta = sta_info_get(sdata, cbss->bssid);
3143                 rcu_read_unlock();
3144         }
3145
3146         if (!have_sta) {
3147                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3148                 if (!new_sta)
3149                         return -ENOMEM;
3150         }
3151
3152         mutex_lock(&local->mtx);
3153         ieee80211_recalc_idle(sdata->local);
3154         mutex_unlock(&local->mtx);
3155
3156         if (new_sta) {
3157                 u32 rates = 0, basic_rates = 0;
3158                 bool have_higher_than_11mbit;
3159                 int min_rate = INT_MAX, min_rate_index = -1;
3160                 struct ieee80211_supported_band *sband;
3161
3162                 sband = local->hw.wiphy->bands[cbss->channel->band];
3163
3164                 err = ieee80211_prep_channel(sdata, cbss);
3165                 if (err) {
3166                         sta_info_free(local, new_sta);
3167                         return err;
3168                 }
3169
3170                 ieee80211_get_rates(sband, bss->supp_rates,
3171                                     bss->supp_rates_len,
3172                                     &rates, &basic_rates,
3173                                     &have_higher_than_11mbit,
3174                                     &min_rate, &min_rate_index);
3175
3176                 /*
3177                  * This used to be a workaround for basic rates missing
3178                  * in the association response frame. Now that we no
3179                  * longer use the basic rates from there, it probably
3180                  * doesn't happen any more, but keep the workaround so
3181                  * in case some *other* APs are buggy in different ways
3182                  * we can connect -- with a warning.
3183                  */
3184                 if (!basic_rates && min_rate_index >= 0) {
3185                         sdata_info(sdata,
3186                                    "No basic rates, using min rate instead\n");
3187                         basic_rates = BIT(min_rate_index);
3188                 }
3189
3190                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3191                 sdata->vif.bss_conf.basic_rates = basic_rates;
3192
3193                 /* cf. IEEE 802.11 9.2.12 */
3194                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3195                     have_higher_than_11mbit)
3196                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3197                 else
3198                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3199
3200                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3201
3202                 /* set timing information */
3203                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3204                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3205                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3206
3207                 /* tell driver about BSSID, basic rates and timing */
3208                 ieee80211_bss_info_change_notify(sdata,
3209                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3210                         BSS_CHANGED_BEACON_INT);
3211
3212                 if (assoc)
3213                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3214
3215                 err = sta_info_insert(new_sta);
3216                 new_sta = NULL;
3217                 if (err) {
3218                         sdata_info(sdata,
3219                                    "failed to insert STA entry for the AP (error %d)\n",
3220                                    err);
3221                         return err;
3222                 }
3223         } else
3224                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3225
3226         return 0;
3227 }
3228
3229 /* config hooks */
3230 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3231                        struct cfg80211_auth_request *req)
3232 {
3233         struct ieee80211_local *local = sdata->local;
3234         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3235         struct ieee80211_mgd_auth_data *auth_data;
3236         u16 auth_alg;
3237         int err;
3238
3239         /* prepare auth data structure */
3240
3241         switch (req->auth_type) {
3242         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3243                 auth_alg = WLAN_AUTH_OPEN;
3244                 break;
3245         case NL80211_AUTHTYPE_SHARED_KEY:
3246                 if (IS_ERR(local->wep_tx_tfm))
3247                         return -EOPNOTSUPP;
3248                 auth_alg = WLAN_AUTH_SHARED_KEY;
3249                 break;
3250         case NL80211_AUTHTYPE_FT:
3251                 auth_alg = WLAN_AUTH_FT;
3252                 break;
3253         case NL80211_AUTHTYPE_NETWORK_EAP:
3254                 auth_alg = WLAN_AUTH_LEAP;
3255                 break;
3256         default:
3257                 return -EOPNOTSUPP;
3258         }
3259
3260         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3261         if (!auth_data)
3262                 return -ENOMEM;
3263
3264         auth_data->bss = req->bss;
3265
3266         if (req->ie && req->ie_len) {
3267                 memcpy(auth_data->ie, req->ie, req->ie_len);
3268                 auth_data->ie_len = req->ie_len;
3269         }
3270
3271         if (req->key && req->key_len) {
3272                 auth_data->key_len = req->key_len;
3273                 auth_data->key_idx = req->key_idx;
3274                 memcpy(auth_data->key, req->key, req->key_len);
3275         }
3276
3277         auth_data->algorithm = auth_alg;
3278
3279         /* try to authenticate/probe */
3280
3281         mutex_lock(&ifmgd->mtx);
3282
3283         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3284             ifmgd->assoc_data) {
3285                 err = -EBUSY;
3286                 goto err_free;
3287         }
3288
3289         if (ifmgd->auth_data)
3290                 ieee80211_destroy_auth_data(sdata, false);
3291
3292         /* prep auth_data so we don't go into idle on disassoc */
3293         ifmgd->auth_data = auth_data;
3294
3295         if (ifmgd->associated)
3296                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3297
3298         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3299
3300         err = ieee80211_prep_connection(sdata, req->bss, false);
3301         if (err)
3302                 goto err_clear;
3303
3304         err = ieee80211_probe_auth(sdata);
3305         if (err) {
3306                 sta_info_destroy_addr(sdata, req->bss->bssid);
3307                 goto err_clear;
3308         }
3309
3310         /* hold our own reference */
3311         cfg80211_ref_bss(auth_data->bss);
3312         err = 0;
3313         goto out_unlock;
3314
3315  err_clear:
3316         memset(ifmgd->bssid, 0, ETH_ALEN);
3317         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3318         ifmgd->auth_data = NULL;
3319  err_free:
3320         kfree(auth_data);
3321  out_unlock:
3322         mutex_unlock(&ifmgd->mtx);
3323
3324         return err;
3325 }
3326
3327 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3328                         struct cfg80211_assoc_request *req)
3329 {
3330         struct ieee80211_local *local = sdata->local;
3331         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3332         struct ieee80211_bss *bss = (void *)req->bss->priv;
3333         struct ieee80211_mgd_assoc_data *assoc_data;
3334         struct ieee80211_supported_band *sband;
3335         const u8 *ssidie, *ht_ie;
3336         int i, err;
3337
3338         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3339         if (!ssidie)
3340                 return -EINVAL;
3341
3342         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3343         if (!assoc_data)
3344                 return -ENOMEM;
3345
3346         mutex_lock(&ifmgd->mtx);
3347
3348         if (ifmgd->associated)
3349                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3350
3351         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3352                 err = -EBUSY;
3353                 goto err_free;
3354         }
3355
3356         if (ifmgd->assoc_data) {
3357                 err = -EBUSY;
3358                 goto err_free;
3359         }
3360
3361         if (ifmgd->auth_data) {
3362                 bool match;
3363
3364                 /* keep sta info, bssid if matching */
3365                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3366                 ieee80211_destroy_auth_data(sdata, match);
3367         }
3368
3369         /* prepare assoc data */
3370
3371         /*
3372          * keep only the 40 MHz disable bit set as it might have
3373          * been set during authentication already, all other bits
3374          * should be reset for a new connection
3375          */
3376         ifmgd->flags &= IEEE80211_STA_DISABLE_40MHZ;
3377
3378         ifmgd->beacon_crc_valid = false;
3379
3380         /*
3381          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3382          * We still associate in non-HT mode (11a/b/g) if any one of these
3383          * ciphers is configured as pairwise.
3384          * We can set this to true for non-11n hardware, that'll be checked
3385          * separately along with the peer capabilities.
3386          */
3387         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3388                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3389                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3390                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3391                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3392                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3393                         netdev_info(sdata->dev,
3394                                     "disabling HT/VHT due to WEP/TKIP use\n");
3395                 }
3396         }
3397
3398         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3399                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3400                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3401         }
3402
3403         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3404         sband = local->hw.wiphy->bands[req->bss->channel->band];
3405         if (!sband->ht_cap.ht_supported ||
3406             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3407                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3408                 if (!bss->wmm_used)
3409                         netdev_info(sdata->dev,
3410                                     "disabling HT as WMM/QoS is not supported by the AP\n");
3411         }
3412
3413         /* disable VHT if we don't support it or the AP doesn't use WMM */
3414         if (!sband->vht_cap.vht_supported ||
3415             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3416                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3417                 if (!bss->wmm_used)
3418                         netdev_info(sdata->dev,
3419                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
3420         }
3421
3422         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3423         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3424                sizeof(ifmgd->ht_capa_mask));
3425
3426         if (req->ie && req->ie_len) {
3427                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3428                 assoc_data->ie_len = req->ie_len;
3429         }
3430
3431         assoc_data->bss = req->bss;
3432
3433         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3434                 if (ifmgd->powersave)
3435                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3436                 else
3437                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3438         } else
3439                 ifmgd->ap_smps = ifmgd->req_smps;
3440
3441         assoc_data->capability = req->bss->capability;
3442         assoc_data->wmm = bss->wmm_used &&
3443                           (local->hw.queues >= IEEE80211_NUM_ACS);
3444         assoc_data->supp_rates = bss->supp_rates;
3445         assoc_data->supp_rates_len = bss->supp_rates_len;
3446
3447         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3448         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3449                 assoc_data->ap_ht_param =
3450                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3451         else
3452                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3453
3454         if (bss->wmm_used && bss->uapsd_supported &&
3455             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3456                 assoc_data->uapsd = true;
3457                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3458         } else {
3459                 assoc_data->uapsd = false;
3460                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3461         }
3462
3463         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3464         assoc_data->ssid_len = ssidie[1];
3465
3466         if (req->prev_bssid)
3467                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3468
3469         if (req->use_mfp) {
3470                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3471                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3472         } else {
3473                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3474                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3475         }
3476
3477         if (req->crypto.control_port)
3478                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3479         else
3480                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3481
3482         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3483         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3484
3485         /* kick off associate process */
3486
3487         ifmgd->assoc_data = assoc_data;
3488
3489         err = ieee80211_prep_connection(sdata, req->bss, true);
3490         if (err)
3491                 goto err_clear;
3492
3493         if (!bss->dtim_period &&
3494             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3495                 /*
3496                  * Wait up to one beacon interval ...
3497                  * should this be more if we miss one?
3498                  */
3499                 sdata_info(sdata, "waiting for beacon from %pM\n",
3500                            ifmgd->bssid);
3501                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3502         } else {
3503                 assoc_data->have_beacon = true;
3504                 assoc_data->sent_assoc = false;
3505                 assoc_data->timeout = jiffies;
3506         }
3507         run_again(ifmgd, assoc_data->timeout);
3508
3509         if (bss->corrupt_data) {
3510                 char *corrupt_type = "data";
3511                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3512                         if (bss->corrupt_data &
3513                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3514                                 corrupt_type = "beacon and probe response";
3515                         else
3516                                 corrupt_type = "beacon";
3517                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3518                         corrupt_type = "probe response";
3519                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3520                            corrupt_type);
3521         }
3522
3523         err = 0;
3524         goto out;
3525  err_clear:
3526         memset(ifmgd->bssid, 0, ETH_ALEN);
3527         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3528         ifmgd->assoc_data = NULL;
3529  err_free:
3530         kfree(assoc_data);
3531  out:
3532         mutex_unlock(&ifmgd->mtx);
3533
3534         return err;
3535 }
3536
3537 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3538                          struct cfg80211_deauth_request *req)
3539 {
3540         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3541         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3542
3543         mutex_lock(&ifmgd->mtx);
3544
3545         if (ifmgd->auth_data) {
3546                 ieee80211_destroy_auth_data(sdata, false);
3547                 mutex_unlock(&ifmgd->mtx);
3548                 return 0;
3549         }
3550
3551         sdata_info(sdata,
3552                    "deauthenticating from %pM by local choice (reason=%d)\n",
3553                    req->bssid, req->reason_code);
3554
3555         if (ifmgd->associated &&
3556             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
3557                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3558                                        req->reason_code, true, frame_buf);
3559         } else {
3560                 drv_mgd_prepare_tx(sdata->local, sdata);
3561                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3562                                                IEEE80211_STYPE_DEAUTH,
3563                                                req->reason_code, true,
3564                                                frame_buf);
3565         }
3566
3567         mutex_unlock(&ifmgd->mtx);
3568
3569         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3570
3571         mutex_lock(&sdata->local->mtx);
3572         ieee80211_recalc_idle(sdata->local);
3573         mutex_unlock(&sdata->local->mtx);
3574
3575         return 0;
3576 }
3577
3578 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3579                            struct cfg80211_disassoc_request *req)
3580 {
3581         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3582         u8 bssid[ETH_ALEN];
3583         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3584
3585         mutex_lock(&ifmgd->mtx);
3586
3587         /*
3588          * cfg80211 should catch this ... but it's racy since
3589          * we can receive a disassoc frame, process it, hand it
3590          * to cfg80211 while that's in a locked section already
3591          * trying to tell us that the user wants to disconnect.
3592          */
3593         if (ifmgd->associated != req->bss) {
3594                 mutex_unlock(&ifmgd->mtx);
3595                 return -ENOLINK;
3596         }
3597
3598         sdata_info(sdata,
3599                    "disassociating from %pM by local choice (reason=%d)\n",
3600                    req->bss->bssid, req->reason_code);
3601
3602         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3603         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3604                                req->reason_code, !req->local_state_change,
3605                                frame_buf);
3606         mutex_unlock(&ifmgd->mtx);
3607
3608         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3609
3610         mutex_lock(&sdata->local->mtx);
3611         ieee80211_recalc_idle(sdata->local);
3612         mutex_unlock(&sdata->local->mtx);
3613
3614         return 0;
3615 }
3616
3617 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3618 {
3619         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3620
3621         mutex_lock(&ifmgd->mtx);
3622         if (ifmgd->assoc_data)
3623                 ieee80211_destroy_assoc_data(sdata, false);
3624         if (ifmgd->auth_data)
3625                 ieee80211_destroy_auth_data(sdata, false);
3626         del_timer_sync(&ifmgd->timer);
3627         mutex_unlock(&ifmgd->mtx);
3628 }
3629
3630 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3631                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3632                                gfp_t gfp)
3633 {
3634         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3635
3636         trace_api_cqm_rssi_notify(sdata, rssi_event);
3637
3638         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3639 }
3640 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);