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                 /*
 734                  * If the channel switch was not successful, stay
 735                  * around on the old channel. We currently lack
 736                  * good handling of this situation, possibly we
 737                  * should just drop the association.
 738                  */
 739                 sdata->local->csa_channel = sdata->local->oper_channel;
 740         }
 741
 742         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 743 }
 744 EXPORT_SYMBOL(ieee80211_chswitch_done);
 745
 746 static void ieee80211_chswitch_timer(unsigned long data)
 747 {
 748         struct ieee80211_sub_if_data *sdata =
 749                 (struct ieee80211_sub_if_data *) data;
 750         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 751
 752         if (sdata->local->quiescing) {
 753                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 754                 return;
 755         }
 756
 757         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 758 }
 759
 760 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 761                                       struct ieee80211_channel_sw_ie *sw_elem,
 762                                       struct ieee80211_bss *bss,
 763                                       u64 timestamp)
 764 {
 765         struct cfg80211_bss *cbss =
 766                 container_of((void *)bss, struct cfg80211_bss, priv);
 767         struct ieee80211_channel *new_ch;
 768         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 769         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 770                                                       cbss->channel->band);
 771
 772         ASSERT_MGD_MTX(ifmgd);
 773
 774         if (!ifmgd->associated)
 775                 return;
 776
 777         if (sdata->local->scanning)
 778                 return;
 779
 780         /* Disregard subsequent beacons if we are already running a timer
 781            processing a CSA */
 782
 783         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 784                 return;
 785
 786         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 787         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 788                 return;
 789
 790         sdata->local->csa_channel = new_ch;
 791
 792         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 793
 794         if (sw_elem->mode)
 795                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 796                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 797
 798         if (sdata->local->ops->channel_switch) {
 799                 /* use driver's channel switch callback */
 800                 struct ieee80211_channel_switch ch_switch = {
 801                         .timestamp = timestamp,
 802                         .block_tx = sw_elem->mode,
 803                         .channel = new_ch,
 804                         .count = sw_elem->count,
 805                 };
 806
 807                 drv_channel_switch(sdata->local, &ch_switch);
 808                 return;
 809         }
 810
 811         /* channel switch handled in software */
 812         if (sw_elem->count <= 1)
 813                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 814         else
 815                 mod_timer(&ifmgd->chswitch_timer,
 816                           jiffies +
 817                           msecs_to_jiffies(sw_elem->count *
 818                                            cbss->beacon_interval));
 819 }
 820
 821 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 822                                         u16 capab_info, u8 *pwr_constr_elem,
 823                                         u8 pwr_constr_elem_len)
 824 {
 825         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 826
 827         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 828                 return;
 829
 830         /* Power constraint IE length should be 1 octet */
 831         if (pwr_constr_elem_len != 1)
 832                 return;
 833
 834         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 835             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 836                 sdata->local->power_constr_level = *pwr_constr_elem;
 837                 ieee80211_hw_config(sdata->local, 0);
 838         }
 839 }
 840
 841 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 842 {
 843         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 844         struct ieee80211_local *local = sdata->local;
 845         struct ieee80211_conf *conf = &local->hw.conf;
 846
 847         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 848                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 849                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 850
 851         local->disable_dynamic_ps = false;
 852         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 853 }
 854 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 855
 856 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 857 {
 858         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 859         struct ieee80211_local *local = sdata->local;
 860         struct ieee80211_conf *conf = &local->hw.conf;
 861
 862         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 863                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 864                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 865
 866         local->disable_dynamic_ps = true;
 867         conf->dynamic_ps_timeout = 0;
 868         del_timer_sync(&local->dynamic_ps_timer);
 869         ieee80211_queue_work(&local->hw,
 870                              &local->dynamic_ps_enable_work);
 871 }
 872 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 873
 874 /* powersave */
 875 static void ieee80211_enable_ps(struct ieee80211_local *local,
 876                                 struct ieee80211_sub_if_data *sdata)
 877 {
 878         struct ieee80211_conf *conf = &local->hw.conf;
 879
 880         /*
 881          * If we are scanning right now then the parameters will
 882          * take effect when scan finishes.
 883          */
 884         if (local->scanning)
 885                 return;
 886
 887         if (conf->dynamic_ps_timeout > 0 &&
 888             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 889                 mod_timer(&local->dynamic_ps_timer, jiffies +
 890                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 891         } else {
 892                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 893                         ieee80211_send_nullfunc(local, sdata, 1);
 894
 895                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 896                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 897                         return;
 898
 899                 conf->flags |= IEEE80211_CONF_PS;
 900                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 901         }
 902 }
 903
 904 static void ieee80211_change_ps(struct ieee80211_local *local)
 905 {
 906         struct ieee80211_conf *conf = &local->hw.conf;
 907
 908         if (local->ps_sdata) {
 909                 ieee80211_enable_ps(local, local->ps_sdata);
 910         } else if (conf->flags & IEEE80211_CONF_PS) {
 911                 conf->flags &= ~IEEE80211_CONF_PS;
 912                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 913                 del_timer_sync(&local->dynamic_ps_timer);
 914                 cancel_work_sync(&local->dynamic_ps_enable_work);
 915         }
 916 }
 917
 918 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 919 {
 920         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 921         struct sta_info *sta = NULL;
 922         bool authorized = false;
 923
 924         if (!mgd->powersave)
 925                 return false;
 926
 927         if (mgd->broken_ap)
 928                 return false;
 929
 930         if (!mgd->associated)
 931                 return false;
 932
 933         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 934                           IEEE80211_STA_CONNECTION_POLL))
 935                 return false;
 936
 937         rcu_read_lock();
 938         sta = sta_info_get(sdata, mgd->bssid);
 939         if (sta)
 940                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 941         rcu_read_unlock();
 942
 943         return authorized;
 944 }
 945
 946 /* need to hold RTNL or interface lock */
 947 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 948 {
 949         struct ieee80211_sub_if_data *sdata, *found = NULL;
 950         int count = 0;
 951         int timeout;
 952
 953         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 954                 local->ps_sdata = NULL;
 955                 return;
 956         }
 957
 958         list_for_each_entry(sdata, &local->interfaces, list) {
 959                 if (!ieee80211_sdata_running(sdata))
 960                         continue;
 961                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 962                         /* If an AP vif is found, then disable PS
 963                          * by setting the count to zero thereby setting
 964                          * ps_sdata to NULL.
 965                          */
 966                         count = 0;
 967                         break;
 968                 }
 969                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 970                         continue;
 971                 found = sdata;
 972                 count++;
 973         }
 974
 975         if (count == 1 && ieee80211_powersave_allowed(found)) {
 976                 struct ieee80211_conf *conf = &local->hw.conf;
 977                 s32 beaconint_us;
 978
 979                 if (latency < 0)
 980                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 981
 982                 beaconint_us = ieee80211_tu_to_usec(
 983                                         found->vif.bss_conf.beacon_int);
 984
 985                 timeout = local->dynamic_ps_forced_timeout;
 986                 if (timeout < 0) {
 987                         /*
 988                          * Go to full PSM if the user configures a very low
 989                          * latency requirement.
 990                          * The 2000 second value is there for compatibility
 991                          * until the PM_QOS_NETWORK_LATENCY is configured
 992                          * with real values.
 993                          */
 994                         if (latency > (1900 * USEC_PER_MSEC) &&
 995                             latency != (2000 * USEC_PER_SEC))
 996                                 timeout = 0;
 997                         else
 998                                 timeout = 100;
 999                 }
1000                 local->dynamic_ps_user_timeout = timeout;
1001                 if (!local->disable_dynamic_ps)
1002                         conf->dynamic_ps_timeout =
1003                                 local->dynamic_ps_user_timeout;
1004
1005                 if (beaconint_us > latency) {
1006                         local->ps_sdata = NULL;
1007                 } else {
1008                         struct ieee80211_bss *bss;
1009                         int maxslp = 1;
1010                         u8 dtimper;
1011
1012                         bss = (void *)found->u.mgd.associated->priv;
1013                         dtimper = bss->dtim_period;
1014
1015                         /* If the TIM IE is invalid, pretend the value is 1 */
1016                         if (!dtimper)
1017                                 dtimper = 1;
1018                         else if (dtimper > 1)
1019                                 maxslp = min_t(int, dtimper,
1020                                                     latency / beaconint_us);
1021
1022                         local->hw.conf.max_sleep_period = maxslp;
1023                         local->hw.conf.ps_dtim_period = dtimper;
1024                         local->ps_sdata = found;
1025                 }
1026         } else {
1027                 local->ps_sdata = NULL;
1028         }
1029
1030         ieee80211_change_ps(local);
1031 }
1032
1033 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1034 {
1035         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1036
1037         if (sdata->vif.bss_conf.ps != ps_allowed) {
1038                 sdata->vif.bss_conf.ps = ps_allowed;
1039                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1040         }
1041 }
1042
1043 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1044 {
1045         struct ieee80211_local *local =
1046                 container_of(work, struct ieee80211_local,
1047                              dynamic_ps_disable_work);
1048
1049         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1050                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1051                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1052         }
1053
1054         ieee80211_wake_queues_by_reason(&local->hw,
1055                                         IEEE80211_QUEUE_STOP_REASON_PS);
1056 }
1057
1058 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1059 {
1060         struct ieee80211_local *local =
1061                 container_of(work, struct ieee80211_local,
1062                              dynamic_ps_enable_work);
1063         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1064         struct ieee80211_if_managed *ifmgd;
1065         unsigned long flags;
1066         int q;
1067
1068         /* can only happen when PS was just disabled anyway */
1069         if (!sdata)
1070                 return;
1071
1072         ifmgd = &sdata->u.mgd;
1073
1074         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1075                 return;
1076
1077         if (!local->disable_dynamic_ps &&
1078             local->hw.conf.dynamic_ps_timeout > 0) {
1079                 /* don't enter PS if TX frames are pending */
1080                 if (drv_tx_frames_pending(local)) {
1081                         mod_timer(&local->dynamic_ps_timer, jiffies +
1082                                   msecs_to_jiffies(
1083                                   local->hw.conf.dynamic_ps_timeout));
1084                         return;
1085                 }
1086
1087                 /*
1088                  * transmission can be stopped by others which leads to
1089                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1090                  * is not the actual idle state.
1091                  */
1092                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1093                 for (q = 0; q < local->hw.queues; q++) {
1094                         if (local->queue_stop_reasons[q]) {
1095                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1096                                                        flags);
1097                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1098                                           msecs_to_jiffies(
1099                                           local->hw.conf.dynamic_ps_timeout));
1100                                 return;
1101                         }
1102                 }
1103                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1104         }
1105
1106         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1107             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1108                 netif_tx_stop_all_queues(sdata->dev);
1109
1110                 if (drv_tx_frames_pending(local))
1111                         mod_timer(&local->dynamic_ps_timer, jiffies +
1112                                   msecs_to_jiffies(
1113                                   local->hw.conf.dynamic_ps_timeout));
1114                 else {
1115                         ieee80211_send_nullfunc(local, sdata, 1);
1116                         /* Flush to get the tx status of nullfunc frame */
1117                         drv_flush(local, false);
1118                 }
1119         }
1120
1121         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1122               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1123             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1124                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1125                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1126                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1127         }
1128
1129         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1130                 netif_tx_wake_all_queues(sdata->dev);
1131 }
1132
1133 void ieee80211_dynamic_ps_timer(unsigned long data)
1134 {
1135         struct ieee80211_local *local = (void *) data;
1136
1137         if (local->quiescing || local->suspended)
1138                 return;
1139
1140         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1141 }
1142
1143 /* MLME */
1144 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1145                                      struct ieee80211_sub_if_data *sdata,
1146                                      u8 *wmm_param, size_t wmm_param_len)
1147 {
1148         struct ieee80211_tx_queue_params params;
1149         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1150         size_t left;
1151         int count;
1152         u8 *pos, uapsd_queues = 0;
1153
1154         if (!local->ops->conf_tx)
1155                 return false;
1156
1157         if (local->hw.queues < IEEE80211_NUM_ACS)
1158                 return false;
1159
1160         if (!wmm_param)
1161                 return false;
1162
1163         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1164                 return false;
1165
1166         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1167                 uapsd_queues = ifmgd->uapsd_queues;
1168
1169         count = wmm_param[6] & 0x0f;
1170         if (count == ifmgd->wmm_last_param_set)
1171                 return false;
1172         ifmgd->wmm_last_param_set = count;
1173
1174         pos = wmm_param + 8;
1175         left = wmm_param_len - 8;
1176
1177         memset(&params, 0, sizeof(params));
1178
1179         sdata->wmm_acm = 0;
1180         for (; left >= 4; left -= 4, pos += 4) {
1181                 int aci = (pos[0] >> 5) & 0x03;
1182                 int acm = (pos[0] >> 4) & 0x01;
1183                 bool uapsd = false;
1184                 int queue;
1185
1186                 switch (aci) {
1187                 case 1: /* AC_BK */
1188                         queue = 3;
1189                         if (acm)
1190                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1191                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1192                                 uapsd = true;
1193                         break;
1194                 case 2: /* AC_VI */
1195                         queue = 1;
1196                         if (acm)
1197                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1198                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1199                                 uapsd = true;
1200                         break;
1201                 case 3: /* AC_VO */
1202                         queue = 0;
1203                         if (acm)
1204                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1205                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1206                                 uapsd = true;
1207                         break;
1208                 case 0: /* AC_BE */
1209                 default:
1210                         queue = 2;
1211                         if (acm)
1212                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1213                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1214                                 uapsd = true;
1215                         break;
1216                 }
1217
1218                 params.aifs = pos[0] & 0x0f;
1219                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1220                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1221                 params.txop = get_unaligned_le16(pos + 2);
1222                 params.uapsd = uapsd;
1223
1224                 mlme_dbg(sdata,
1225                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1226                          queue, aci, acm,
1227                          params.aifs, params.cw_min, params.cw_max,
1228                          params.txop, params.uapsd);
1229                 sdata->tx_conf[queue] = params;
1230                 if (drv_conf_tx(local, sdata, queue, &params))
1231                         sdata_err(sdata,
1232                                   "failed to set TX queue parameters for queue %d\n",
1233                                   queue);
1234         }
1235
1236         /* enable WMM or activate new settings */
1237         sdata->vif.bss_conf.qos = true;
1238         return true;
1239 }
1240
1241 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1242 {
1243         lockdep_assert_held(&sdata->local->mtx);
1244
1245         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1246                                 IEEE80211_STA_BEACON_POLL);
1247         ieee80211_run_deferred_scan(sdata->local);
1248 }
1249
1250 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1251 {
1252         mutex_lock(&sdata->local->mtx);
1253         __ieee80211_stop_poll(sdata);
1254         mutex_unlock(&sdata->local->mtx);
1255 }
1256
1257 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1258                                            u16 capab, bool erp_valid, u8 erp)
1259 {
1260         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1261         u32 changed = 0;
1262         bool use_protection;
1263         bool use_short_preamble;
1264         bool use_short_slot;
1265
1266         if (erp_valid) {
1267                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1268                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1269         } else {
1270                 use_protection = false;
1271                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1272         }
1273
1274         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1275         if (sdata->local->oper_channel->band == IEEE80211_BAND_5GHZ)
1276                 use_short_slot = true;
1277
1278         if (use_protection != bss_conf->use_cts_prot) {
1279                 bss_conf->use_cts_prot = use_protection;
1280                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1281         }
1282
1283         if (use_short_preamble != bss_conf->use_short_preamble) {
1284                 bss_conf->use_short_preamble = use_short_preamble;
1285                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1286         }
1287
1288         if (use_short_slot != bss_conf->use_short_slot) {
1289                 bss_conf->use_short_slot = use_short_slot;
1290                 changed |= BSS_CHANGED_ERP_SLOT;
1291         }
1292
1293         return changed;
1294 }
1295
1296 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1297                                      struct cfg80211_bss *cbss,
1298                                      u32 bss_info_changed)
1299 {
1300         struct ieee80211_bss *bss = (void *)cbss->priv;
1301         struct ieee80211_local *local = sdata->local;
1302         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1303
1304         bss_info_changed |= BSS_CHANGED_ASSOC;
1305         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1306                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1307
1308         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1309                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1310
1311         sdata->u.mgd.associated = cbss;
1312         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1313
1314         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1315
1316         /* just to be sure */
1317         ieee80211_stop_poll(sdata);
1318
1319         ieee80211_led_assoc(local, 1);
1320
1321         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1322                 bss_conf->dtim_period = bss->dtim_period;
1323         else
1324                 bss_conf->dtim_period = 0;
1325
1326         bss_conf->assoc = 1;
1327
1328         /* Tell the driver to monitor connection quality (if supported) */
1329         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1330             bss_conf->cqm_rssi_thold)
1331                 bss_info_changed |= BSS_CHANGED_CQM;
1332
1333         /* Enable ARP filtering */
1334         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1335                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1336                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1337         }
1338
1339         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1340
1341         mutex_lock(&local->iflist_mtx);
1342         ieee80211_recalc_ps(local, -1);
1343         ieee80211_recalc_smps(local);
1344         mutex_unlock(&local->iflist_mtx);
1345
1346         ieee80211_recalc_ps_vif(sdata);
1347
1348         netif_tx_start_all_queues(sdata->dev);
1349         netif_carrier_on(sdata->dev);
1350 }
1351
1352 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1353                                    u16 stype, u16 reason, bool tx,
1354                                    u8 *frame_buf)
1355 {
1356         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1357         struct ieee80211_local *local = sdata->local;
1358         struct sta_info *sta;
1359         u32 changed = 0;
1360
1361         ASSERT_MGD_MTX(ifmgd);
1362
1363         if (WARN_ON_ONCE(tx && !frame_buf))
1364                 return;
1365
1366         if (WARN_ON(!ifmgd->associated))
1367                 return;
1368
1369         ieee80211_stop_poll(sdata);
1370
1371         ifmgd->associated = NULL;
1372
1373         /*
1374          * we need to commit the associated = NULL change because the
1375          * scan code uses that to determine whether this iface should
1376          * go to/wake up from powersave or not -- and could otherwise
1377          * wake the queues erroneously.
1378          */
1379         smp_mb();
1380
1381         /*
1382          * Thus, we can only afterwards stop the queues -- to account
1383          * for the case where another CPU is finishing a scan at this
1384          * time -- we don't want the scan code to enable queues.
1385          */
1386
1387         netif_tx_stop_all_queues(sdata->dev);
1388         netif_carrier_off(sdata->dev);
1389
1390         mutex_lock(&local->sta_mtx);
1391         sta = sta_info_get(sdata, ifmgd->bssid);
1392         if (sta) {
1393                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1394                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1395         }
1396         mutex_unlock(&local->sta_mtx);
1397
1398         /*
1399          * if we want to get out of ps before disassoc (why?) we have
1400          * to do it before sending disassoc, as otherwise the null-packet
1401          * won't be valid.
1402          */
1403         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1404                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1405                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1406         }
1407         local->ps_sdata = NULL;
1408
1409         /* disable per-vif ps */
1410         ieee80211_recalc_ps_vif(sdata);
1411
1412         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1413         if (tx)
1414                 drv_flush(local, false);
1415
1416         /* deauthenticate/disassociate now */
1417         if (tx || frame_buf)
1418                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1419                                                reason, tx, frame_buf);
1420
1421         /* flush out frame */
1422         if (tx)
1423                 drv_flush(local, false);
1424
1425         /* clear bssid only after building the needed mgmt frames */
1426         memset(ifmgd->bssid, 0, ETH_ALEN);
1427
1428         /* remove AP and TDLS peers */
1429         sta_info_flush(local, sdata);
1430
1431         /* finally reset all BSS / config parameters */
1432         changed |= ieee80211_reset_erp_info(sdata);
1433
1434         ieee80211_led_assoc(local, 0);
1435         changed |= BSS_CHANGED_ASSOC;
1436         sdata->vif.bss_conf.assoc = false;
1437
1438         /* on the next assoc, re-program HT parameters */
1439         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1440         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1441
1442         local->power_constr_level = 0;
1443
1444         del_timer_sync(&local->dynamic_ps_timer);
1445         cancel_work_sync(&local->dynamic_ps_enable_work);
1446
1447         /* Disable ARP filtering */
1448         if (sdata->vif.bss_conf.arp_filter_enabled) {
1449                 sdata->vif.bss_conf.arp_filter_enabled = false;
1450                 changed |= BSS_CHANGED_ARP_FILTER;
1451         }
1452
1453         sdata->vif.bss_conf.qos = false;
1454         changed |= BSS_CHANGED_QOS;
1455
1456         /* The BSSID (not really interesting) and HT changed */
1457         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1458         ieee80211_bss_info_change_notify(sdata, changed);
1459
1460         /* channel(_type) changes are handled by ieee80211_hw_config */
1461         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1462         ieee80211_hw_config(local, 0);
1463
1464         /* disassociated - set to defaults now */
1465         ieee80211_set_wmm_default(sdata, false);
1466
1467         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1468         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1469         del_timer_sync(&sdata->u.mgd.timer);
1470         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1471 }
1472
1473 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1474                              struct ieee80211_hdr *hdr)
1475 {
1476         /*
1477          * We can postpone the mgd.timer whenever receiving unicast frames
1478          * from AP because we know that the connection is working both ways
1479          * at that time. But multicast frames (and hence also beacons) must
1480          * be ignored here, because we need to trigger the timer during
1481          * data idle periods for sending the periodic probe request to the
1482          * AP we're connected to.
1483          */
1484         if (is_multicast_ether_addr(hdr->addr1))
1485                 return;
1486
1487         ieee80211_sta_reset_conn_monitor(sdata);
1488 }
1489
1490 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1491 {
1492         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1493         struct ieee80211_local *local = sdata->local;
1494
1495         mutex_lock(&local->mtx);
1496         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1497                               IEEE80211_STA_CONNECTION_POLL))) {
1498                 mutex_unlock(&local->mtx);
1499                 return;
1500         }
1501
1502         __ieee80211_stop_poll(sdata);
1503
1504         mutex_lock(&local->iflist_mtx);
1505         ieee80211_recalc_ps(local, -1);
1506         mutex_unlock(&local->iflist_mtx);
1507
1508         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1509                 goto out;
1510
1511         /*
1512          * We've received a probe response, but are not sure whether
1513          * we have or will be receiving any beacons or data, so let's
1514          * schedule the timers again, just in case.
1515          */
1516         ieee80211_sta_reset_beacon_monitor(sdata);
1517
1518         mod_timer(&ifmgd->conn_mon_timer,
1519                   round_jiffies_up(jiffies +
1520                                    IEEE80211_CONNECTION_IDLE_TIME));
1521 out:
1522         mutex_unlock(&local->mtx);
1523 }
1524
1525 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1526                              struct ieee80211_hdr *hdr, bool ack)
1527 {
1528         if (!ieee80211_is_data(hdr->frame_control))
1529             return;
1530
1531         if (ack)
1532                 ieee80211_sta_reset_conn_monitor(sdata);
1533
1534         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1535             sdata->u.mgd.probe_send_count > 0) {
1536                 if (ack)
1537                         sdata->u.mgd.probe_send_count = 0;
1538                 else
1539                         sdata->u.mgd.nullfunc_failed = true;
1540                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1541         }
1542 }
1543
1544 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1545 {
1546         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1547         const u8 *ssid;
1548         u8 *dst = ifmgd->associated->bssid;
1549         u8 unicast_limit = max(1, max_probe_tries - 3);
1550
1551         /*
1552          * Try sending broadcast probe requests for the last three
1553          * probe requests after the first ones failed since some
1554          * buggy APs only support broadcast probe requests.
1555          */
1556         if (ifmgd->probe_send_count >= unicast_limit)
1557                 dst = NULL;
1558
1559         /*
1560          * When the hardware reports an accurate Tx ACK status, it's
1561          * better to send a nullfunc frame instead of a probe request,
1562          * as it will kick us off the AP quickly if we aren't associated
1563          * anymore. The timeout will be reset if the frame is ACKed by
1564          * the AP.
1565          */
1566         ifmgd->probe_send_count++;
1567
1568         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1569                 ifmgd->nullfunc_failed = false;
1570                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1571         } else {
1572                 int ssid_len;
1573
1574                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1575                 if (WARN_ON_ONCE(ssid == NULL))
1576                         ssid_len = 0;
1577                 else
1578                         ssid_len = ssid[1];
1579
1580                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1581                                          0, (u32) -1, true, false);
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_connection_loss(struct ieee80211_sub_if_data *sdata)
1694 {
1695         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1696         struct ieee80211_local *local = sdata->local;
1697         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1698
1699         mutex_lock(&ifmgd->mtx);
1700         if (!ifmgd->associated) {
1701                 mutex_unlock(&ifmgd->mtx);
1702                 return;
1703         }
1704
1705         sdata_info(sdata, "Connection to AP %pM lost\n",
1706                    ifmgd->associated->bssid);
1707
1708         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1709                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1710                                false, frame_buf);
1711         mutex_unlock(&ifmgd->mtx);
1712
1713         /*
1714          * must be outside lock due to cfg80211,
1715          * but that's not a problem.
1716          */
1717         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1718
1719         mutex_lock(&local->mtx);
1720         ieee80211_recalc_idle(local);
1721         mutex_unlock(&local->mtx);
1722 }
1723
1724 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1725 {
1726         struct ieee80211_sub_if_data *sdata =
1727                 container_of(work, struct ieee80211_sub_if_data,
1728                              u.mgd.beacon_connection_loss_work);
1729         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1730         struct sta_info *sta;
1731
1732         if (ifmgd->associated) {
1733                 rcu_read_lock();
1734                 sta = sta_info_get(sdata, ifmgd->bssid);
1735                 if (sta)
1736                         sta->beacon_loss_count++;
1737                 rcu_read_unlock();
1738         }
1739
1740         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1741                 __ieee80211_connection_loss(sdata);
1742         else
1743                 ieee80211_mgd_probe_ap(sdata, true);
1744 }
1745
1746 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1747 {
1748         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1749         struct ieee80211_hw *hw = &sdata->local->hw;
1750
1751         trace_api_beacon_loss(sdata);
1752
1753         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1754         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1755 }
1756 EXPORT_SYMBOL(ieee80211_beacon_loss);
1757
1758 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1759 {
1760         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1761         struct ieee80211_hw *hw = &sdata->local->hw;
1762
1763         trace_api_connection_loss(sdata);
1764
1765         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1766         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1767 }
1768 EXPORT_SYMBOL(ieee80211_connection_loss);
1769
1770
1771 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1772                                         bool assoc)
1773 {
1774         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1775
1776         lockdep_assert_held(&sdata->u.mgd.mtx);
1777
1778         if (!assoc) {
1779                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1780
1781                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1782                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1783         }
1784
1785         cfg80211_put_bss(auth_data->bss);
1786         kfree(auth_data);
1787         sdata->u.mgd.auth_data = NULL;
1788 }
1789
1790 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1791                                      struct ieee80211_mgmt *mgmt, size_t len)
1792 {
1793         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1794         u8 *pos;
1795         struct ieee802_11_elems elems;
1796
1797         pos = mgmt->u.auth.variable;
1798         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1799         if (!elems.challenge)
1800                 return;
1801         auth_data->expected_transaction = 4;
1802         drv_mgd_prepare_tx(sdata->local, sdata);
1803         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1804                             elems.challenge - 2, elems.challenge_len + 2,
1805                             auth_data->bss->bssid, auth_data->bss->bssid,
1806                             auth_data->key, auth_data->key_len,
1807                             auth_data->key_idx);
1808 }
1809
1810 static enum rx_mgmt_action __must_check
1811 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1812                        struct ieee80211_mgmt *mgmt, size_t len)
1813 {
1814         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1815         u8 bssid[ETH_ALEN];
1816         u16 auth_alg, auth_transaction, status_code;
1817         struct sta_info *sta;
1818
1819         lockdep_assert_held(&ifmgd->mtx);
1820
1821         if (len < 24 + 6)
1822                 return RX_MGMT_NONE;
1823
1824         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1825                 return RX_MGMT_NONE;
1826
1827         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1828
1829         if (!ether_addr_equal(bssid, mgmt->bssid))
1830                 return RX_MGMT_NONE;
1831
1832         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1833         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1834         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1835
1836         if (auth_alg != ifmgd->auth_data->algorithm ||
1837             auth_transaction != ifmgd->auth_data->expected_transaction)
1838                 return RX_MGMT_NONE;
1839
1840         if (status_code != WLAN_STATUS_SUCCESS) {
1841                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1842                            mgmt->sa, status_code);
1843                 ieee80211_destroy_auth_data(sdata, false);
1844                 return RX_MGMT_CFG80211_RX_AUTH;
1845         }
1846
1847         switch (ifmgd->auth_data->algorithm) {
1848         case WLAN_AUTH_OPEN:
1849         case WLAN_AUTH_LEAP:
1850         case WLAN_AUTH_FT:
1851                 break;
1852         case WLAN_AUTH_SHARED_KEY:
1853                 if (ifmgd->auth_data->expected_transaction != 4) {
1854                         ieee80211_auth_challenge(sdata, mgmt, len);
1855                         /* need another frame */
1856                         return RX_MGMT_NONE;
1857                 }
1858                 break;
1859         default:
1860                 WARN_ONCE(1, "invalid auth alg %d",
1861                           ifmgd->auth_data->algorithm);
1862                 return RX_MGMT_NONE;
1863         }
1864
1865         sdata_info(sdata, "authenticated\n");
1866         ifmgd->auth_data->done = true;
1867         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1868         run_again(ifmgd, ifmgd->auth_data->timeout);
1869
1870         /* move station state to auth */
1871         mutex_lock(&sdata->local->sta_mtx);
1872         sta = sta_info_get(sdata, bssid);
1873         if (!sta) {
1874                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1875                 goto out_err;
1876         }
1877         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1878                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1879                 goto out_err;
1880         }
1881         mutex_unlock(&sdata->local->sta_mtx);
1882
1883         return RX_MGMT_CFG80211_RX_AUTH;
1884  out_err:
1885         mutex_unlock(&sdata->local->sta_mtx);
1886         /* ignore frame -- wait for timeout */
1887         return RX_MGMT_NONE;
1888 }
1889
1890
1891 static enum rx_mgmt_action __must_check
1892 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1893                          struct ieee80211_mgmt *mgmt, size_t len)
1894 {
1895         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1896         const u8 *bssid = NULL;
1897         u16 reason_code;
1898
1899         lockdep_assert_held(&ifmgd->mtx);
1900
1901         if (len < 24 + 2)
1902                 return RX_MGMT_NONE;
1903
1904         if (!ifmgd->associated ||
1905             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1906                 return RX_MGMT_NONE;
1907
1908         bssid = ifmgd->associated->bssid;
1909
1910         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1911
1912         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1913                    bssid, reason_code);
1914
1915         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1916
1917         mutex_lock(&sdata->local->mtx);
1918         ieee80211_recalc_idle(sdata->local);
1919         mutex_unlock(&sdata->local->mtx);
1920
1921         return RX_MGMT_CFG80211_DEAUTH;
1922 }
1923
1924
1925 static enum rx_mgmt_action __must_check
1926 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1927                            struct ieee80211_mgmt *mgmt, size_t len)
1928 {
1929         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1930         u16 reason_code;
1931
1932         lockdep_assert_held(&ifmgd->mtx);
1933
1934         if (len < 24 + 2)
1935                 return RX_MGMT_NONE;
1936
1937         if (!ifmgd->associated ||
1938             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1939                 return RX_MGMT_NONE;
1940
1941         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1942
1943         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1944                    mgmt->sa, reason_code);
1945
1946         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1947
1948         mutex_lock(&sdata->local->mtx);
1949         ieee80211_recalc_idle(sdata->local);
1950         mutex_unlock(&sdata->local->mtx);
1951
1952         return RX_MGMT_CFG80211_DISASSOC;
1953 }
1954
1955 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1956                                 u8 *supp_rates, unsigned int supp_rates_len,
1957                                 u32 *rates, u32 *basic_rates,
1958                                 bool *have_higher_than_11mbit,
1959                                 int *min_rate, int *min_rate_index)
1960 {
1961         int i, j;
1962
1963         for (i = 0; i < supp_rates_len; i++) {
1964                 int rate = (supp_rates[i] & 0x7f) * 5;
1965                 bool is_basic = !!(supp_rates[i] & 0x80);
1966
1967                 if (rate > 110)
1968                         *have_higher_than_11mbit = true;
1969
1970                 /*
1971                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1972                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1973                  *
1974                  * Note: Even through the membership selector and the basic
1975                  *       rate flag share the same bit, they are not exactly
1976                  *       the same.
1977                  */
1978                 if (!!(supp_rates[i] & 0x80) &&
1979                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1980                         continue;
1981
1982                 for (j = 0; j < sband->n_bitrates; j++) {
1983                         if (sband->bitrates[j].bitrate == rate) {
1984                                 *rates |= BIT(j);
1985                                 if (is_basic)
1986                                         *basic_rates |= BIT(j);
1987                                 if (rate < *min_rate) {
1988                                         *min_rate = rate;
1989                                         *min_rate_index = j;
1990                                 }
1991                                 break;
1992                         }
1993                 }
1994         }
1995 }
1996
1997 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1998                                          bool assoc)
1999 {
2000         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2001
2002         lockdep_assert_held(&sdata->u.mgd.mtx);
2003
2004         if (!assoc) {
2005                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2006
2007                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2008                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2009         }
2010
2011         kfree(assoc_data);
2012         sdata->u.mgd.assoc_data = NULL;
2013 }
2014
2015 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2016                                     struct cfg80211_bss *cbss,
2017                                     struct ieee80211_mgmt *mgmt, size_t len)
2018 {
2019         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2020         struct ieee80211_local *local = sdata->local;
2021         struct ieee80211_supported_band *sband;
2022         struct sta_info *sta;
2023         u8 *pos;
2024         u16 capab_info, aid;
2025         struct ieee802_11_elems elems;
2026         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2027         u32 changed = 0;
2028         int err;
2029
2030         /* AssocResp and ReassocResp have identical structure */
2031
2032         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2033         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2034
2035         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2036                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2037                            aid);
2038         aid &= ~(BIT(15) | BIT(14));
2039
2040         ifmgd->broken_ap = false;
2041
2042         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2043                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2044                            aid);
2045                 aid = 0;
2046                 ifmgd->broken_ap = true;
2047         }
2048
2049         pos = mgmt->u.assoc_resp.variable;
2050         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2051
2052         if (!elems.supp_rates) {
2053                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2054                 return false;
2055         }
2056
2057         ifmgd->aid = aid;
2058
2059         mutex_lock(&sdata->local->sta_mtx);
2060         /*
2061          * station info was already allocated and inserted before
2062          * the association and should be available to us
2063          */
2064         sta = sta_info_get(sdata, cbss->bssid);
2065         if (WARN_ON(!sta)) {
2066                 mutex_unlock(&sdata->local->sta_mtx);
2067                 return false;
2068         }
2069
2070         sband = local->hw.wiphy->bands[local->oper_channel->band];
2071
2072         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2073                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2074                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2075
2076         sta->supports_40mhz =
2077                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2078
2079         rate_control_rate_init(sta);
2080
2081         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2082                 set_sta_flag(sta, WLAN_STA_MFP);
2083
2084         if (elems.wmm_param)
2085                 set_sta_flag(sta, WLAN_STA_WME);
2086
2087         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2088         if (!err)
2089                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2090         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2091                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2092         if (err) {
2093                 sdata_info(sdata,
2094                            "failed to move station %pM to desired state\n",
2095                            sta->sta.addr);
2096                 WARN_ON(__sta_info_destroy(sta));
2097                 mutex_unlock(&sdata->local->sta_mtx);
2098                 return false;
2099         }
2100
2101         mutex_unlock(&sdata->local->sta_mtx);
2102
2103         /*
2104          * Always handle WMM once after association regardless
2105          * of the first value the AP uses. Setting -1 here has
2106          * that effect because the AP values is an unsigned
2107          * 4-bit value.
2108          */
2109         ifmgd->wmm_last_param_set = -1;
2110
2111         if (elems.wmm_param)
2112                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2113                                          elems.wmm_param_len);
2114         else
2115                 ieee80211_set_wmm_default(sdata, false);
2116         changed |= BSS_CHANGED_QOS;
2117
2118         if (elems.ht_operation && elems.wmm_param &&
2119             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2120                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2121                                                   cbss->bssid, false);
2122
2123         /* set AID and assoc capability,
2124          * ieee80211_set_associated() will tell the driver */
2125         bss_conf->aid = aid;
2126         bss_conf->assoc_capability = capab_info;
2127         ieee80211_set_associated(sdata, cbss, changed);
2128
2129         /*
2130          * If we're using 4-addr mode, let the AP know that we're
2131          * doing so, so that it can create the STA VLAN on its side
2132          */
2133         if (ifmgd->use_4addr)
2134                 ieee80211_send_4addr_nullfunc(local, sdata);
2135
2136         /*
2137          * Start timer to probe the connection to the AP now.
2138          * Also start the timer that will detect beacon loss.
2139          */
2140         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2141         ieee80211_sta_reset_beacon_monitor(sdata);
2142
2143         return true;
2144 }
2145
2146 static enum rx_mgmt_action __must_check
2147 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2148                              struct ieee80211_mgmt *mgmt, size_t len,
2149                              struct cfg80211_bss **bss)
2150 {
2151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2152         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2153         u16 capab_info, status_code, aid;
2154         struct ieee802_11_elems elems;
2155         u8 *pos;
2156         bool reassoc;
2157
2158         lockdep_assert_held(&ifmgd->mtx);
2159
2160         if (!assoc_data)
2161                 return RX_MGMT_NONE;
2162         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2163                 return RX_MGMT_NONE;
2164
2165         /*
2166          * AssocResp and ReassocResp have identical structure, so process both
2167          * of them in this function.
2168          */
2169
2170         if (len < 24 + 6)
2171                 return RX_MGMT_NONE;
2172
2173         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2174         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2175         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2176         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2177
2178         sdata_info(sdata,
2179                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2180                    reassoc ? "Rea" : "A", mgmt->sa,
2181                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2182
2183         pos = mgmt->u.assoc_resp.variable;
2184         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2185
2186         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2187             elems.timeout_int && elems.timeout_int_len == 5 &&
2188             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2189                 u32 tu, ms;
2190                 tu = get_unaligned_le32(elems.timeout_int + 1);
2191                 ms = tu * 1024 / 1000;
2192                 sdata_info(sdata,
2193                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2194                            mgmt->sa, tu, ms);
2195                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2196                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2197                         run_again(ifmgd, assoc_data->timeout);
2198                 return RX_MGMT_NONE;
2199         }
2200
2201         *bss = assoc_data->bss;
2202
2203         if (status_code != WLAN_STATUS_SUCCESS) {
2204                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2205                            mgmt->sa, status_code);
2206                 ieee80211_destroy_assoc_data(sdata, false);
2207         } else {
2208                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2209                         /* oops -- internal error -- send timeout for now */
2210                         ieee80211_destroy_assoc_data(sdata, false);
2211                         cfg80211_put_bss(*bss);
2212                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2213                 }
2214                 sdata_info(sdata, "associated\n");
2215
2216                 /*
2217                  * destroy assoc_data afterwards, as otherwise an idle
2218                  * recalc after assoc_data is NULL but before associated
2219                  * is set can cause the interface to go idle
2220                  */
2221                 ieee80211_destroy_assoc_data(sdata, true);
2222         }
2223
2224         return RX_MGMT_CFG80211_RX_ASSOC;
2225 }
2226 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2227                                   struct ieee80211_mgmt *mgmt,
2228                                   size_t len,
2229                                   struct ieee80211_rx_status *rx_status,
2230                                   struct ieee802_11_elems *elems,
2231                                   bool beacon)
2232 {
2233         struct ieee80211_local *local = sdata->local;
2234         int freq;
2235         struct ieee80211_bss *bss;
2236         struct ieee80211_channel *channel;
2237         bool need_ps = false;
2238
2239         if (sdata->u.mgd.associated &&
2240             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2241                 bss = (void *)sdata->u.mgd.associated->priv;
2242                 /* not previously set so we may need to recalc */
2243                 need_ps = !bss->dtim_period;
2244         }
2245
2246         if (elems->ds_params && elems->ds_params_len == 1)
2247                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2248                                                       rx_status->band);
2249         else
2250                 freq = rx_status->freq;
2251
2252         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2253
2254         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2255                 return;
2256
2257         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2258                                         channel, beacon);
2259         if (bss)
2260                 ieee80211_rx_bss_put(local, bss);
2261
2262         if (!sdata->u.mgd.associated)
2263                 return;
2264
2265         if (need_ps) {
2266                 mutex_lock(&local->iflist_mtx);
2267                 ieee80211_recalc_ps(local, -1);
2268                 mutex_unlock(&local->iflist_mtx);
2269         }
2270
2271         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2272             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2273                                                         ETH_ALEN) == 0)) {
2274                 struct ieee80211_channel_sw_ie *sw_elem =
2275                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2276                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2277                                                  bss, rx_status->mactime);
2278         }
2279 }
2280
2281
2282 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2283                                          struct sk_buff *skb)
2284 {
2285         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2286         struct ieee80211_if_managed *ifmgd;
2287         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2288         size_t baselen, len = skb->len;
2289         struct ieee802_11_elems elems;
2290
2291         ifmgd = &sdata->u.mgd;
2292
2293         ASSERT_MGD_MTX(ifmgd);
2294
2295         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2296                 return; /* ignore ProbeResp to foreign address */
2297
2298         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2299         if (baselen > len)
2300                 return;
2301
2302         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2303                                 &elems);
2304
2305         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2306
2307         if (ifmgd->associated &&
2308             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2309                 ieee80211_reset_ap_probe(sdata);
2310
2311         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2312             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2313                 /* got probe response, continue with auth */
2314                 sdata_info(sdata, "direct probe responded\n");
2315                 ifmgd->auth_data->tries = 0;
2316                 ifmgd->auth_data->timeout = jiffies;
2317                 run_again(ifmgd, ifmgd->auth_data->timeout);
2318         }
2319 }
2320
2321 /*
2322  * This is the canonical list of information elements we care about,
2323  * the filter code also gives us all changes to the Microsoft OUI
2324  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2325  *
2326  * We implement beacon filtering in software since that means we can
2327  * avoid processing the frame here and in cfg80211, and userspace
2328  * will not be able to tell whether the hardware supports it or not.
2329  *
2330  * XXX: This list needs to be dynamic -- userspace needs to be able to
2331  *      add items it requires. It also needs to be able to tell us to
2332  *      look out for other vendor IEs.
2333  */
2334 static const u64 care_about_ies =
2335         (1ULL << WLAN_EID_COUNTRY) |
2336         (1ULL << WLAN_EID_ERP_INFO) |
2337         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2338         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2339         (1ULL << WLAN_EID_HT_CAPABILITY) |
2340         (1ULL << WLAN_EID_HT_OPERATION);
2341
2342 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2343                                      struct ieee80211_mgmt *mgmt,
2344                                      size_t len,
2345                                      struct ieee80211_rx_status *rx_status)
2346 {
2347         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2348         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2349         size_t baselen;
2350         struct ieee802_11_elems elems;
2351         struct ieee80211_local *local = sdata->local;
2352         u32 changed = 0;
2353         bool erp_valid, directed_tim = false;
2354         u8 erp_value = 0;
2355         u32 ncrc;
2356         u8 *bssid;
2357
2358         lockdep_assert_held(&ifmgd->mtx);
2359
2360         /* Process beacon from the current BSS */
2361         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2362         if (baselen > len)
2363                 return;
2364
2365         if (rx_status->freq != local->oper_channel->center_freq)
2366                 return;
2367
2368         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2369             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2370                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2371                                        len - baselen, &elems);
2372
2373                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2374                                       false);
2375                 ifmgd->assoc_data->have_beacon = true;
2376                 ifmgd->assoc_data->sent_assoc = false;
2377                 /* continue assoc process */
2378                 ifmgd->assoc_data->timeout = jiffies;
2379                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2380                 return;
2381         }
2382
2383         if (!ifmgd->associated ||
2384             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2385                 return;
2386         bssid = ifmgd->associated->bssid;
2387
2388         /* Track average RSSI from the Beacon frames of the current AP */
2389         ifmgd->last_beacon_signal = rx_status->signal;
2390         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2391                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2392                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2393                 ifmgd->last_cqm_event_signal = 0;
2394                 ifmgd->count_beacon_signal = 1;
2395                 ifmgd->last_ave_beacon_signal = 0;
2396         } else {
2397                 ifmgd->ave_beacon_signal =
2398                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2399                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2400                          ifmgd->ave_beacon_signal) / 16;
2401                 ifmgd->count_beacon_signal++;
2402         }
2403
2404         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2405             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2406                 int sig = ifmgd->ave_beacon_signal;
2407                 int last_sig = ifmgd->last_ave_beacon_signal;
2408
2409                 /*
2410                  * if signal crosses either of the boundaries, invoke callback
2411                  * with appropriate parameters
2412                  */
2413                 if (sig > ifmgd->rssi_max_thold &&
2414                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2415                         ifmgd->last_ave_beacon_signal = sig;
2416                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2417                 } else if (sig < ifmgd->rssi_min_thold &&
2418                            (last_sig >= ifmgd->rssi_max_thold ||
2419                            last_sig == 0)) {
2420                         ifmgd->last_ave_beacon_signal = sig;
2421                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2422                 }
2423         }
2424
2425         if (bss_conf->cqm_rssi_thold &&
2426             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2427             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2428                 int sig = ifmgd->ave_beacon_signal / 16;
2429                 int last_event = ifmgd->last_cqm_event_signal;
2430                 int thold = bss_conf->cqm_rssi_thold;
2431                 int hyst = bss_conf->cqm_rssi_hyst;
2432                 if (sig < thold &&
2433                     (last_event == 0 || sig < last_event - hyst)) {
2434                         ifmgd->last_cqm_event_signal = sig;
2435                         ieee80211_cqm_rssi_notify(
2436                                 &sdata->vif,
2437                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2438                                 GFP_KERNEL);
2439                 } else if (sig > thold &&
2440                            (last_event == 0 || sig > last_event + hyst)) {
2441                         ifmgd->last_cqm_event_signal = sig;
2442                         ieee80211_cqm_rssi_notify(
2443                                 &sdata->vif,
2444                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2445                                 GFP_KERNEL);
2446                 }
2447         }
2448
2449         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2450                 mlme_dbg_ratelimited(sdata,
2451                                      "cancelling probereq poll due to a received beacon\n");
2452                 mutex_lock(&local->mtx);
2453                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2454                 ieee80211_run_deferred_scan(local);
2455                 mutex_unlock(&local->mtx);
2456
2457                 mutex_lock(&local->iflist_mtx);
2458                 ieee80211_recalc_ps(local, -1);
2459                 mutex_unlock(&local->iflist_mtx);
2460         }
2461
2462         /*
2463          * Push the beacon loss detection into the future since
2464          * we are processing a beacon from the AP just now.
2465          */
2466         ieee80211_sta_reset_beacon_monitor(sdata);
2467
2468         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2469         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2470                                           len - baselen, &elems,
2471                                           care_about_ies, ncrc);
2472
2473         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2474                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2475                                                    ifmgd->aid);
2476
2477         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2478                 if (directed_tim) {
2479                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2480                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2481                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2482                                         ieee80211_hw_config(local,
2483                                                             IEEE80211_CONF_CHANGE_PS);
2484                                 }
2485                                 ieee80211_send_nullfunc(local, sdata, 0);
2486                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2487                                 local->pspolling = true;
2488
2489                                 /*
2490                                  * Here is assumed that the driver will be
2491                                  * able to send ps-poll frame and receive a
2492                                  * response even though power save mode is
2493                                  * enabled, but some drivers might require
2494                                  * to disable power save here. This needs
2495                                  * to be investigated.
2496                                  */
2497                                 ieee80211_send_pspoll(local, sdata);
2498                         }
2499                 }
2500         }
2501
2502         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2503                 return;
2504         ifmgd->beacon_crc = ncrc;
2505         ifmgd->beacon_crc_valid = true;
2506
2507         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2508                               true);
2509
2510         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2511                                      elems.wmm_param_len))
2512                 changed |= BSS_CHANGED_QOS;
2513
2514         if (elems.erp_info && elems.erp_info_len >= 1) {
2515                 erp_valid = true;
2516                 erp_value = elems.erp_info[0];
2517         } else {
2518                 erp_valid = false;
2519         }
2520         changed |= ieee80211_handle_bss_capability(sdata,
2521                         le16_to_cpu(mgmt->u.beacon.capab_info),
2522                         erp_valid, erp_value);
2523
2524
2525         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2526             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2527                 struct ieee80211_supported_band *sband;
2528
2529                 sband = local->hw.wiphy->bands[local->oper_channel->band];
2530
2531                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2532                                                   bssid, true);
2533         }
2534
2535         /* Note: country IE parsing is done for us by cfg80211 */
2536         if (elems.country_elem) {
2537                 /* TODO: IBSS also needs this */
2538                 if (elems.pwr_constr_elem)
2539                         ieee80211_handle_pwr_constr(sdata,
2540                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2541                                 elems.pwr_constr_elem,
2542                                 elems.pwr_constr_elem_len);
2543         }
2544
2545         ieee80211_bss_info_change_notify(sdata, changed);
2546 }
2547
2548 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2549                                   struct sk_buff *skb)
2550 {
2551         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2552         struct ieee80211_rx_status *rx_status;
2553         struct ieee80211_mgmt *mgmt;
2554         struct cfg80211_bss *bss = NULL;
2555         enum rx_mgmt_action rma = RX_MGMT_NONE;
2556         u16 fc;
2557
2558         rx_status = (struct ieee80211_rx_status *) skb->cb;
2559         mgmt = (struct ieee80211_mgmt *) skb->data;
2560         fc = le16_to_cpu(mgmt->frame_control);
2561
2562         mutex_lock(&ifmgd->mtx);
2563
2564         switch (fc & IEEE80211_FCTL_STYPE) {
2565         case IEEE80211_STYPE_BEACON:
2566                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2567                 break;
2568         case IEEE80211_STYPE_PROBE_RESP:
2569                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2570                 break;
2571         case IEEE80211_STYPE_AUTH:
2572                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2573                 break;
2574         case IEEE80211_STYPE_DEAUTH:
2575                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2576                 break;
2577         case IEEE80211_STYPE_DISASSOC:
2578                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2579                 break;
2580         case IEEE80211_STYPE_ASSOC_RESP:
2581         case IEEE80211_STYPE_REASSOC_RESP:
2582                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2583                 break;
2584         case IEEE80211_STYPE_ACTION:
2585                 switch (mgmt->u.action.category) {
2586                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2587                         ieee80211_sta_process_chanswitch(sdata,
2588                                         &mgmt->u.action.u.chan_switch.sw_elem,
2589                                         (void *)ifmgd->associated->priv,
2590                                         rx_status->mactime);
2591                         break;
2592                 }
2593         }
2594         mutex_unlock(&ifmgd->mtx);
2595
2596         switch (rma) {
2597         case RX_MGMT_NONE:
2598                 /* no action */
2599                 break;
2600         case RX_MGMT_CFG80211_DEAUTH:
2601                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2602                 break;
2603         case RX_MGMT_CFG80211_DISASSOC:
2604                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2605                 break;
2606         case RX_MGMT_CFG80211_RX_AUTH:
2607                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2608                 break;
2609         case RX_MGMT_CFG80211_RX_ASSOC:
2610                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2611                 break;
2612         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2613                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2614                 break;
2615         default:
2616                 WARN(1, "unexpected: %d", rma);
2617         }
2618 }
2619
2620 static void ieee80211_sta_timer(unsigned long data)
2621 {
2622         struct ieee80211_sub_if_data *sdata =
2623                 (struct ieee80211_sub_if_data *) data;
2624         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2625         struct ieee80211_local *local = sdata->local;
2626
2627         if (local->quiescing) {
2628                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2629                 return;
2630         }
2631
2632         ieee80211_queue_work(&local->hw, &sdata->work);
2633 }
2634
2635 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2636                                           u8 *bssid, u8 reason)
2637 {
2638         struct ieee80211_local *local = sdata->local;
2639         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2640         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2641
2642         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2643                                false, frame_buf);
2644         mutex_unlock(&ifmgd->mtx);
2645
2646         /*
2647          * must be outside lock due to cfg80211,
2648          * but that's not a problem.
2649          */
2650         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2651
2652         mutex_lock(&local->mtx);
2653         ieee80211_recalc_idle(local);
2654         mutex_unlock(&local->mtx);
2655
2656         mutex_lock(&ifmgd->mtx);
2657 }
2658
2659 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2660 {
2661         struct ieee80211_local *local = sdata->local;
2662         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2663         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2664
2665         lockdep_assert_held(&ifmgd->mtx);
2666
2667         if (WARN_ON_ONCE(!auth_data))
2668                 return -EINVAL;
2669
2670         auth_data->tries++;
2671
2672         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2673                 sdata_info(sdata, "authentication with %pM timed out\n",
2674                            auth_data->bss->bssid);
2675
2676                 /*
2677                  * Most likely AP is not in the range so remove the
2678                  * bss struct for that AP.
2679                  */
2680                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2681
2682                 return -ETIMEDOUT;
2683         }
2684
2685         drv_mgd_prepare_tx(local, sdata);
2686
2687         if (auth_data->bss->proberesp_ies) {
2688                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2689                            auth_data->bss->bssid, auth_data->tries,
2690                            IEEE80211_AUTH_MAX_TRIES);
2691
2692                 auth_data->expected_transaction = 2;
2693                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2694                                     auth_data->ie, auth_data->ie_len,
2695                                     auth_data->bss->bssid,
2696                                     auth_data->bss->bssid, NULL, 0, 0);
2697         } else {
2698                 const u8 *ssidie;
2699
2700                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2701                            auth_data->bss->bssid, auth_data->tries,
2702                            IEEE80211_AUTH_MAX_TRIES);
2703
2704                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2705                 if (!ssidie)
2706                         return -EINVAL;
2707                 /*
2708                  * Direct probe is sent to broadcast address as some APs
2709                  * will not answer to direct packet in unassociated state.
2710                  */
2711                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2712                                          NULL, 0, (u32) -1, true, false);
2713         }
2714
2715         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2716         run_again(ifmgd, auth_data->timeout);
2717
2718         return 0;
2719 }
2720
2721 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2722 {
2723         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2724         struct ieee80211_local *local = sdata->local;
2725
2726         lockdep_assert_held(&sdata->u.mgd.mtx);
2727
2728         assoc_data->tries++;
2729         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2730                 sdata_info(sdata, "association with %pM timed out\n",
2731                            assoc_data->bss->bssid);
2732
2733                 /*
2734                  * Most likely AP is not in the range so remove the
2735                  * bss struct for that AP.
2736                  */
2737                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2738
2739                 return -ETIMEDOUT;
2740         }
2741
2742         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2743                    assoc_data->bss->bssid, assoc_data->tries,
2744                    IEEE80211_ASSOC_MAX_TRIES);
2745         ieee80211_send_assoc(sdata);
2746
2747         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2748         run_again(&sdata->u.mgd, assoc_data->timeout);
2749
2750         return 0;
2751 }
2752
2753 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2754 {
2755         struct ieee80211_local *local = sdata->local;
2756         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2757
2758         mutex_lock(&ifmgd->mtx);
2759
2760         if (ifmgd->auth_data &&
2761             time_after(jiffies, ifmgd->auth_data->timeout)) {
2762                 if (ifmgd->auth_data->done) {
2763                         /*
2764                          * ok ... we waited for assoc but userspace didn't,
2765                          * so let's just kill the auth data
2766                          */
2767                         ieee80211_destroy_auth_data(sdata, false);
2768                 } else if (ieee80211_probe_auth(sdata)) {
2769                         u8 bssid[ETH_ALEN];
2770
2771                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2772
2773                         ieee80211_destroy_auth_data(sdata, false);
2774
2775                         mutex_unlock(&ifmgd->mtx);
2776                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2777                         mutex_lock(&ifmgd->mtx);
2778                 }
2779         } else if (ifmgd->auth_data)
2780                 run_again(ifmgd, ifmgd->auth_data->timeout);
2781
2782         if (ifmgd->assoc_data &&
2783             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2784                 if (!ifmgd->assoc_data->have_beacon ||
2785                     ieee80211_do_assoc(sdata)) {
2786                         u8 bssid[ETH_ALEN];
2787
2788                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2789
2790                         ieee80211_destroy_assoc_data(sdata, false);
2791
2792                         mutex_unlock(&ifmgd->mtx);
2793                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2794                         mutex_lock(&ifmgd->mtx);
2795                 }
2796         } else if (ifmgd->assoc_data)
2797                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2798
2799         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2800                             IEEE80211_STA_CONNECTION_POLL) &&
2801             ifmgd->associated) {
2802                 u8 bssid[ETH_ALEN];
2803                 int max_tries;
2804
2805                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2806
2807                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2808                         max_tries = max_nullfunc_tries;
2809                 else
2810                         max_tries = max_probe_tries;
2811
2812                 /* ACK received for nullfunc probing frame */
2813                 if (!ifmgd->probe_send_count)
2814                         ieee80211_reset_ap_probe(sdata);
2815                 else if (ifmgd->nullfunc_failed) {
2816                         if (ifmgd->probe_send_count < max_tries) {
2817                                 mlme_dbg(sdata,
2818                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2819                                          bssid, ifmgd->probe_send_count,
2820                                          max_tries);
2821                                 ieee80211_mgd_probe_ap_send(sdata);
2822                         } else {
2823                                 mlme_dbg(sdata,
2824                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2825                                          bssid);
2826                                 ieee80211_sta_connection_lost(sdata, bssid,
2827                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2828                         }
2829                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2830                         run_again(ifmgd, ifmgd->probe_timeout);
2831                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2832                         mlme_dbg(sdata,
2833                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2834                                  bssid, probe_wait_ms);
2835                         ieee80211_sta_connection_lost(sdata, bssid,
2836                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2837                 } else if (ifmgd->probe_send_count < max_tries) {
2838                         mlme_dbg(sdata,
2839                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2840                                  bssid, probe_wait_ms,
2841                                  ifmgd->probe_send_count, max_tries);
2842                         ieee80211_mgd_probe_ap_send(sdata);
2843                 } else {
2844                         /*
2845                          * We actually lost the connection ... or did we?
2846                          * Let's make sure!
2847                          */
2848                         wiphy_debug(local->hw.wiphy,
2849                                     "%s: No probe response from AP %pM"
2850                                     " after %dms, disconnecting.\n",
2851                                     sdata->name,
2852                                     bssid, probe_wait_ms);
2853
2854                         ieee80211_sta_connection_lost(sdata, bssid,
2855                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2856                 }
2857         }
2858
2859         mutex_unlock(&ifmgd->mtx);
2860
2861         mutex_lock(&local->mtx);
2862         ieee80211_recalc_idle(local);
2863         mutex_unlock(&local->mtx);
2864 }
2865
2866 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2867 {
2868         struct ieee80211_sub_if_data *sdata =
2869                 (struct ieee80211_sub_if_data *) data;
2870         struct ieee80211_local *local = sdata->local;
2871
2872         if (local->quiescing)
2873                 return;
2874
2875         ieee80211_queue_work(&sdata->local->hw,
2876                              &sdata->u.mgd.beacon_connection_loss_work);
2877 }
2878
2879 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2880 {
2881         struct ieee80211_sub_if_data *sdata =
2882                 (struct ieee80211_sub_if_data *) data;
2883         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2884         struct ieee80211_local *local = sdata->local;
2885
2886         if (local->quiescing)
2887                 return;
2888
2889         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2890 }
2891
2892 static void ieee80211_sta_monitor_work(struct work_struct *work)
2893 {
2894         struct ieee80211_sub_if_data *sdata =
2895                 container_of(work, struct ieee80211_sub_if_data,
2896                              u.mgd.monitor_work);
2897
2898         ieee80211_mgd_probe_ap(sdata, false);
2899 }
2900
2901 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2902 {
2903         u32 flags;
2904
2905         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2906                 __ieee80211_stop_poll(sdata);
2907
2908                 /* let's probe the connection once */
2909                 flags = sdata->local->hw.flags;
2910                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2911                         ieee80211_queue_work(&sdata->local->hw,
2912                                              &sdata->u.mgd.monitor_work);
2913                 /* and do all the other regular work too */
2914                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2915         }
2916 }
2917
2918 #ifdef CONFIG_PM
2919 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2920 {
2921         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2922
2923         /*
2924          * we need to use atomic bitops for the running bits
2925          * only because both timers might fire at the same
2926          * time -- the code here is properly synchronised.
2927          */
2928
2929         cancel_work_sync(&ifmgd->request_smps_work);
2930
2931         cancel_work_sync(&ifmgd->monitor_work);
2932         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2933         if (del_timer_sync(&ifmgd->timer))
2934                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2935
2936         cancel_work_sync(&ifmgd->chswitch_work);
2937         if (del_timer_sync(&ifmgd->chswitch_timer))
2938                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2939
2940         /* these will just be re-established on connection */
2941         del_timer_sync(&ifmgd->conn_mon_timer);
2942         del_timer_sync(&ifmgd->bcn_mon_timer);
2943 }
2944
2945 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2946 {
2947         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2948
2949         if (!ifmgd->associated)
2950                 return;
2951
2952         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2953                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2954                 mutex_lock(&ifmgd->mtx);
2955                 if (ifmgd->associated) {
2956                         mlme_dbg(sdata,
2957                                  "driver requested disconnect after resume\n");
2958                         ieee80211_sta_connection_lost(sdata,
2959                                 ifmgd->associated->bssid,
2960                                 WLAN_REASON_UNSPECIFIED);
2961                         mutex_unlock(&ifmgd->mtx);
2962                         return;
2963                 }
2964                 mutex_unlock(&ifmgd->mtx);
2965         }
2966
2967         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2968                 add_timer(&ifmgd->timer);
2969         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2970                 add_timer(&ifmgd->chswitch_timer);
2971         ieee80211_sta_reset_beacon_monitor(sdata);
2972
2973         mutex_lock(&sdata->local->mtx);
2974         ieee80211_restart_sta_timer(sdata);
2975         mutex_unlock(&sdata->local->mtx);
2976 }
2977 #endif
2978
2979 /* interface setup */
2980 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2981 {
2982         struct ieee80211_if_managed *ifmgd;
2983
2984         ifmgd = &sdata->u.mgd;
2985         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2986         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2987         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2988                   ieee80211_beacon_connection_loss_work);
2989         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2990         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2991                     (unsigned long) sdata);
2992         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2993                     (unsigned long) sdata);
2994         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2995                     (unsigned long) sdata);
2996         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2997                     (unsigned long) sdata);
2998
2999         ifmgd->flags = 0;
3000         ifmgd->powersave = sdata->wdev.ps;
3001         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3002         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3003
3004         mutex_init(&ifmgd->mtx);
3005
3006         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3007                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3008         else
3009                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3010 }
3011
3012 /* scan finished notification */
3013 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3014 {
3015         struct ieee80211_sub_if_data *sdata;
3016
3017         /* Restart STA timers */
3018         rcu_read_lock();
3019         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3020                 ieee80211_restart_sta_timer(sdata);
3021         rcu_read_unlock();
3022 }
3023
3024 int ieee80211_max_network_latency(struct notifier_block *nb,
3025                                   unsigned long data, void *dummy)
3026 {
3027         s32 latency_usec = (s32) data;
3028         struct ieee80211_local *local =
3029                 container_of(nb, struct ieee80211_local,
3030                              network_latency_notifier);
3031
3032         mutex_lock(&local->iflist_mtx);
3033         ieee80211_recalc_ps(local, latency_usec);
3034         mutex_unlock(&local->iflist_mtx);
3035
3036         return 0;
3037 }
3038
3039 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3040                                   struct cfg80211_bss *cbss)
3041 {
3042         struct ieee80211_local *local = sdata->local;
3043         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3044         int ht_cfreq;
3045         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3046         const u8 *ht_oper_ie;
3047         const struct ieee80211_ht_operation *ht_oper = NULL;
3048         struct ieee80211_supported_band *sband;
3049
3050         sband = local->hw.wiphy->bands[cbss->channel->band];
3051
3052         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3053
3054         if (sband->ht_cap.ht_supported) {
3055                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3056                                               cbss->information_elements,
3057                                               cbss->len_information_elements);
3058                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3059                         ht_oper = (void *)(ht_oper_ie + 2);
3060         }
3061
3062         if (ht_oper) {
3063                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3064                                                           cbss->channel->band);
3065                 /* check that channel matches the right operating channel */
3066                 if (cbss->channel->center_freq != ht_cfreq) {
3067                         /*
3068                          * It's possible that some APs are confused here;
3069                          * Netgear WNDR3700 sometimes reports 4 higher than
3070                          * the actual channel in association responses, but
3071                          * since we look at probe response/beacon data here
3072                          * it should be OK.
3073                          */
3074                         sdata_info(sdata,
3075                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3076                                    cbss->channel->center_freq,
3077                                    ht_cfreq, ht_oper->primary_chan,
3078                                    cbss->channel->band);
3079                         ht_oper = NULL;
3080                 }
3081         }
3082
3083         if (ht_oper) {
3084                 channel_type = NL80211_CHAN_HT20;
3085
3086                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3087                         switch (ht_oper->ht_param &
3088                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3089                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3090                                 channel_type = NL80211_CHAN_HT40PLUS;
3091                                 break;
3092                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3093                                 channel_type = NL80211_CHAN_HT40MINUS;
3094                                 break;
3095                         }
3096                 }
3097         }
3098
3099         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3100                 /* can only fail due to HT40+/- mismatch */
3101                 channel_type = NL80211_CHAN_HT20;
3102                 sdata_info(sdata,
3103                            "disabling 40 MHz due to multi-vif mismatch\n");
3104                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3105                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3106                                                     channel_type));
3107         }
3108
3109         local->oper_channel = cbss->channel;
3110         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3111
3112         return 0;
3113 }
3114
3115 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3116                                      struct cfg80211_bss *cbss, bool assoc)
3117 {
3118         struct ieee80211_local *local = sdata->local;
3119         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3120         struct ieee80211_bss *bss = (void *)cbss->priv;
3121         struct sta_info *new_sta = NULL;
3122         bool have_sta = false;
3123         int err;
3124
3125         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3126                 return -EINVAL;
3127
3128         if (assoc) {
3129                 rcu_read_lock();
3130                 have_sta = sta_info_get(sdata, cbss->bssid);
3131                 rcu_read_unlock();
3132         }
3133
3134         if (!have_sta) {
3135                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3136                 if (!new_sta)
3137                         return -ENOMEM;
3138         }
3139
3140         mutex_lock(&local->mtx);
3141         ieee80211_recalc_idle(sdata->local);
3142         mutex_unlock(&local->mtx);
3143
3144         if (new_sta) {
3145                 u32 rates = 0, basic_rates = 0;
3146                 bool have_higher_than_11mbit;
3147                 int min_rate = INT_MAX, min_rate_index = -1;
3148                 struct ieee80211_supported_band *sband;
3149
3150                 sband = local->hw.wiphy->bands[cbss->channel->band];
3151
3152                 err = ieee80211_prep_channel(sdata, cbss);
3153                 if (err) {
3154                         sta_info_free(local, new_sta);
3155                         return err;
3156                 }
3157
3158                 ieee80211_get_rates(sband, bss->supp_rates,
3159                                     bss->supp_rates_len,
3160                                     &rates, &basic_rates,
3161                                     &have_higher_than_11mbit,
3162                                     &min_rate, &min_rate_index);
3163
3164                 /*
3165                  * This used to be a workaround for basic rates missing
3166                  * in the association response frame. Now that we no
3167                  * longer use the basic rates from there, it probably
3168                  * doesn't happen any more, but keep the workaround so
3169                  * in case some *other* APs are buggy in different ways
3170                  * we can connect -- with a warning.
3171                  */
3172                 if (!basic_rates && min_rate_index >= 0) {
3173                         sdata_info(sdata,
3174                                    "No basic rates, using min rate instead\n");
3175                         basic_rates = BIT(min_rate_index);
3176                 }
3177
3178                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3179                 sdata->vif.bss_conf.basic_rates = basic_rates;
3180
3181                 /* cf. IEEE 802.11 9.2.12 */
3182                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3183                     have_higher_than_11mbit)
3184                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3185                 else
3186                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3187
3188                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3189
3190                 /* set timing information */
3191                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3192                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3193                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3194
3195                 /* tell driver about BSSID, basic rates and timing */
3196                 ieee80211_bss_info_change_notify(sdata,
3197                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3198                         BSS_CHANGED_BEACON_INT);
3199
3200                 if (assoc)
3201                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3202
3203                 err = sta_info_insert(new_sta);
3204                 new_sta = NULL;
3205                 if (err) {
3206                         sdata_info(sdata,
3207                                    "failed to insert STA entry for the AP (error %d)\n",
3208                                    err);
3209                         return err;
3210                 }
3211         } else
3212                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3213
3214         return 0;
3215 }
3216
3217 /* config hooks */
3218 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3219                        struct cfg80211_auth_request *req)
3220 {
3221         struct ieee80211_local *local = sdata->local;
3222         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3223         struct ieee80211_mgd_auth_data *auth_data;
3224         u16 auth_alg;
3225         int err;
3226
3227         /* prepare auth data structure */
3228
3229         switch (req->auth_type) {
3230         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3231                 auth_alg = WLAN_AUTH_OPEN;
3232                 break;
3233         case NL80211_AUTHTYPE_SHARED_KEY:
3234                 if (IS_ERR(local->wep_tx_tfm))
3235                         return -EOPNOTSUPP;
3236                 auth_alg = WLAN_AUTH_SHARED_KEY;
3237                 break;
3238         case NL80211_AUTHTYPE_FT:
3239                 auth_alg = WLAN_AUTH_FT;
3240                 break;
3241         case NL80211_AUTHTYPE_NETWORK_EAP:
3242                 auth_alg = WLAN_AUTH_LEAP;
3243                 break;
3244         default:
3245                 return -EOPNOTSUPP;
3246         }
3247
3248         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3249         if (!auth_data)
3250                 return -ENOMEM;
3251
3252         auth_data->bss = req->bss;
3253
3254         if (req->ie && req->ie_len) {
3255                 memcpy(auth_data->ie, req->ie, req->ie_len);
3256                 auth_data->ie_len = req->ie_len;
3257         }
3258
3259         if (req->key && req->key_len) {
3260                 auth_data->key_len = req->key_len;
3261                 auth_data->key_idx = req->key_idx;
3262                 memcpy(auth_data->key, req->key, req->key_len);
3263         }
3264
3265         auth_data->algorithm = auth_alg;
3266
3267         /* try to authenticate/probe */
3268
3269         mutex_lock(&ifmgd->mtx);
3270
3271         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3272             ifmgd->assoc_data) {
3273                 err = -EBUSY;
3274                 goto err_free;
3275         }
3276
3277         if (ifmgd->auth_data)
3278                 ieee80211_destroy_auth_data(sdata, false);
3279
3280         /* prep auth_data so we don't go into idle on disassoc */
3281         ifmgd->auth_data = auth_data;
3282
3283         if (ifmgd->associated)
3284                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3285
3286         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3287
3288         err = ieee80211_prep_connection(sdata, req->bss, false);
3289         if (err)
3290                 goto err_clear;
3291
3292         err = ieee80211_probe_auth(sdata);
3293         if (err) {
3294                 sta_info_destroy_addr(sdata, req->bss->bssid);
3295                 goto err_clear;
3296         }
3297
3298         /* hold our own reference */
3299         cfg80211_ref_bss(auth_data->bss);
3300         err = 0;
3301         goto out_unlock;
3302
3303  err_clear:
3304         ifmgd->auth_data = NULL;
3305  err_free:
3306         kfree(auth_data);
3307  out_unlock:
3308         mutex_unlock(&ifmgd->mtx);
3309
3310         return err;
3311 }
3312
3313 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3314                         struct cfg80211_assoc_request *req)
3315 {
3316         struct ieee80211_local *local = sdata->local;
3317         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3318         struct ieee80211_bss *bss = (void *)req->bss->priv;
3319         struct ieee80211_mgd_assoc_data *assoc_data;
3320         struct ieee80211_supported_band *sband;
3321         const u8 *ssidie, *ht_ie;
3322         int i, err;
3323
3324         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3325         if (!ssidie)
3326                 return -EINVAL;
3327
3328         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3329         if (!assoc_data)
3330                 return -ENOMEM;
3331
3332         mutex_lock(&ifmgd->mtx);
3333
3334         if (ifmgd->associated)
3335                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3336
3337         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3338                 err = -EBUSY;
3339                 goto err_free;
3340         }
3341
3342         if (ifmgd->assoc_data) {
3343                 err = -EBUSY;
3344                 goto err_free;
3345         }
3346
3347         if (ifmgd->auth_data) {
3348                 bool match;
3349
3350                 /* keep sta info, bssid if matching */
3351                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3352                 ieee80211_destroy_auth_data(sdata, match);
3353         }
3354
3355         /* prepare assoc data */
3356
3357         /*
3358          * keep only the 40 MHz disable bit set as it might have
3359          * been set during authentication already, all other bits
3360          * should be reset for a new connection
3361          */
3362         ifmgd->flags &= IEEE80211_STA_DISABLE_40MHZ;
3363
3364         ifmgd->beacon_crc_valid = false;
3365
3366         /*
3367          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3368          * We still associate in non-HT mode (11a/b/g) if any one of these
3369          * ciphers is configured as pairwise.
3370          * We can set this to true for non-11n hardware, that'll be checked
3371          * separately along with the peer capabilities.
3372          */
3373         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3374                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3375                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3376                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3377                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3378                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3379                         netdev_info(sdata->dev,
3380                                     "disabling HT/VHT due to WEP/TKIP use\n");
3381                 }
3382         }
3383
3384         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3385                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3386                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3387         }
3388
3389         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3390         sband = local->hw.wiphy->bands[req->bss->channel->band];
3391         if (!sband->ht_cap.ht_supported ||
3392             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3393                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3394                 if (!bss->wmm_used)
3395                         netdev_info(sdata->dev,
3396                                     "disabling HT as WMM/QoS is not supported by the AP\n");
3397         }
3398
3399         /* disable VHT if we don't support it or the AP doesn't use WMM */
3400         if (!sband->vht_cap.vht_supported ||
3401             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3402                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3403                 if (!bss->wmm_used)
3404                         netdev_info(sdata->dev,
3405                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
3406         }
3407
3408         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3409         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3410                sizeof(ifmgd->ht_capa_mask));
3411
3412         if (req->ie && req->ie_len) {
3413                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3414                 assoc_data->ie_len = req->ie_len;
3415         }
3416
3417         assoc_data->bss = req->bss;
3418
3419         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3420                 if (ifmgd->powersave)
3421                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3422                 else
3423                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3424         } else
3425                 ifmgd->ap_smps = ifmgd->req_smps;
3426
3427         assoc_data->capability = req->bss->capability;
3428         assoc_data->wmm = bss->wmm_used &&
3429                           (local->hw.queues >= IEEE80211_NUM_ACS);
3430         assoc_data->supp_rates = bss->supp_rates;
3431         assoc_data->supp_rates_len = bss->supp_rates_len;
3432
3433         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3434         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3435                 assoc_data->ap_ht_param =
3436                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3437         else
3438                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3439
3440         if (bss->wmm_used && bss->uapsd_supported &&
3441             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3442                 assoc_data->uapsd = true;
3443                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3444         } else {
3445                 assoc_data->uapsd = false;
3446                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3447         }
3448
3449         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3450         assoc_data->ssid_len = ssidie[1];
3451
3452         if (req->prev_bssid)
3453                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3454
3455         if (req->use_mfp) {
3456                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3457                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3458         } else {
3459                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3460                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3461         }
3462
3463         if (req->crypto.control_port)
3464                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3465         else
3466                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3467
3468         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3469         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3470
3471         /* kick off associate process */
3472
3473         ifmgd->assoc_data = assoc_data;
3474
3475         err = ieee80211_prep_connection(sdata, req->bss, true);
3476         if (err)
3477                 goto err_clear;
3478
3479         if (!bss->dtim_period &&
3480             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3481                 /*
3482                  * Wait up to one beacon interval ...
3483                  * should this be more if we miss one?
3484                  */
3485                 sdata_info(sdata, "waiting for beacon from %pM\n",
3486                            ifmgd->bssid);
3487                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3488         } else {
3489                 assoc_data->have_beacon = true;
3490                 assoc_data->sent_assoc = false;
3491                 assoc_data->timeout = jiffies;
3492         }
3493         run_again(ifmgd, assoc_data->timeout);
3494
3495         if (bss->corrupt_data) {
3496                 char *corrupt_type = "data";
3497                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3498                         if (bss->corrupt_data &
3499                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3500                                 corrupt_type = "beacon and probe response";
3501                         else
3502                                 corrupt_type = "beacon";
3503                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3504                         corrupt_type = "probe response";
3505                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3506                            corrupt_type);
3507         }
3508
3509         err = 0;
3510         goto out;
3511  err_clear:
3512         ifmgd->assoc_data = NULL;
3513  err_free:
3514         kfree(assoc_data);
3515  out:
3516         mutex_unlock(&ifmgd->mtx);
3517
3518         return err;
3519 }
3520
3521 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3522                          struct cfg80211_deauth_request *req)
3523 {
3524         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3525         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3526
3527         mutex_lock(&ifmgd->mtx);
3528
3529         if (ifmgd->auth_data) {
3530                 ieee80211_destroy_auth_data(sdata, false);
3531                 mutex_unlock(&ifmgd->mtx);
3532                 return 0;
3533         }
3534
3535         sdata_info(sdata,
3536                    "deauthenticating from %pM by local choice (reason=%d)\n",
3537                    req->bssid, req->reason_code);
3538
3539         if (ifmgd->associated &&
3540             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
3541                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3542                                        req->reason_code, true, frame_buf);
3543         } else {
3544                 drv_mgd_prepare_tx(sdata->local, sdata);
3545                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3546                                                IEEE80211_STYPE_DEAUTH,
3547                                                req->reason_code, true,
3548                                                frame_buf);
3549         }
3550
3551         mutex_unlock(&ifmgd->mtx);
3552
3553         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3554
3555         mutex_lock(&sdata->local->mtx);
3556         ieee80211_recalc_idle(sdata->local);
3557         mutex_unlock(&sdata->local->mtx);
3558
3559         return 0;
3560 }
3561
3562 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3563                            struct cfg80211_disassoc_request *req)
3564 {
3565         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3566         u8 bssid[ETH_ALEN];
3567         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3568
3569         mutex_lock(&ifmgd->mtx);
3570
3571         /*
3572          * cfg80211 should catch this ... but it's racy since
3573          * we can receive a disassoc frame, process it, hand it
3574          * to cfg80211 while that's in a locked section already
3575          * trying to tell us that the user wants to disconnect.
3576          */
3577         if (ifmgd->associated != req->bss) {
3578                 mutex_unlock(&ifmgd->mtx);
3579                 return -ENOLINK;
3580         }
3581
3582         sdata_info(sdata,
3583                    "disassociating from %pM by local choice (reason=%d)\n",
3584                    req->bss->bssid, req->reason_code);
3585
3586         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3587         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3588                                req->reason_code, !req->local_state_change,
3589                                frame_buf);
3590         mutex_unlock(&ifmgd->mtx);
3591
3592         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3593
3594         mutex_lock(&sdata->local->mtx);
3595         ieee80211_recalc_idle(sdata->local);
3596         mutex_unlock(&sdata->local->mtx);
3597
3598         return 0;
3599 }
3600
3601 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3602 {
3603         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3604
3605         mutex_lock(&ifmgd->mtx);
3606         if (ifmgd->assoc_data)
3607                 ieee80211_destroy_assoc_data(sdata, false);
3608         if (ifmgd->auth_data)
3609                 ieee80211_destroy_auth_data(sdata, false);
3610         del_timer_sync(&ifmgd->timer);
3611         mutex_unlock(&ifmgd->mtx);
3612 }
3613
3614 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3615                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3616                                gfp_t gfp)
3617 {
3618         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3619
3620         trace_api_cqm_rssi_notify(sdata, rssi_event);
3621
3622         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3623 }
3624 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);