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         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 150                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 151 }
 152
 153 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 154 {
 155         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 156
 157         if (unlikely(!sdata->u.mgd.associated))
 158                 return;
 159
 160         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 161                 return;
 162
 163         mod_timer(&sdata->u.mgd.conn_mon_timer,
 164                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 165
 166         ifmgd->probe_send_count = 0;
 167 }
 168
 169 static int ecw2cw(int ecw)
 170 {
 171         return (1 << ecw) - 1;
 172 }
 173
 174 static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
 175                                   struct ieee80211_ht_operation *ht_oper,
 176                                   const u8 *bssid, bool reconfig)
 177 {
 178         struct ieee80211_local *local = sdata->local;
 179         struct ieee80211_supported_band *sband;
 180         struct sta_info *sta;
 181         u32 changed = 0;
 182         u16 ht_opmode;
 183         bool disable_40 = false;
 184
 185         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 186
 187         switch (sdata->vif.bss_conf.channel_type) {
 188         case NL80211_CHAN_HT40PLUS:
 189                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
 190                         disable_40 = true;
 191                 break;
 192         case NL80211_CHAN_HT40MINUS:
 193                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
 194                         disable_40 = true;
 195                 break;
 196         default:
 197                 break;
 198         }
 199
 200         /* This can change during the lifetime of the BSS */
 201         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 202                 disable_40 = true;
 203
 204         mutex_lock(&local->sta_mtx);
 205         sta = sta_info_get(sdata, bssid);
 206
 207         WARN_ON_ONCE(!sta);
 208
 209         if (sta && !sta->supports_40mhz)
 210                 disable_40 = true;
 211
 212         if (sta && (!reconfig ||
 213                     (disable_40 != !!(sta->sta.ht_cap.cap &
 214                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 215
 216                 if (disable_40)
 217                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 218                 else
 219                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 220
 221                 rate_control_rate_update(local, sband, sta,
 222                                          IEEE80211_RC_BW_CHANGED);
 223         }
 224         mutex_unlock(&local->sta_mtx);
 225
 226         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 227
 228         /* if bss configuration changed store the new one */
 229         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 230                 changed |= BSS_CHANGED_HT;
 231                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 232         }
 233
 234         return changed;
 235 }
 236
 237 /* frame sending functions */
 238
 239 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 240                                       struct ieee80211_supported_band *sband,
 241                                       u32 *rates)
 242 {
 243         int i, j, count;
 244         *rates = 0;
 245         count = 0;
 246         for (i = 0; i < supp_rates_len; i++) {
 247                 int rate = (supp_rates[i] & 0x7F) * 5;
 248
 249                 for (j = 0; j < sband->n_bitrates; j++)
 250                         if (sband->bitrates[j].bitrate == rate) {
 251                                 *rates |= BIT(j);
 252                                 count++;
 253                                 break;
 254                         }
 255         }
 256
 257         return count;
 258 }
 259
 260 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 261                                 struct sk_buff *skb, const u8 *ht_oper_ie,
 262                                 struct ieee80211_supported_band *sband,
 263                                 struct ieee80211_channel *channel,
 264                                 enum ieee80211_smps_mode smps)
 265 {
 266         struct ieee80211_ht_operation *ht_oper;
 267         u8 *pos;
 268         u32 flags = channel->flags;
 269         u16 cap;
 270         struct ieee80211_sta_ht_cap ht_cap;
 271
 272         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 273
 274         if (!ht_oper_ie)
 275                 return;
 276
 277         if (ht_oper_ie[1] < sizeof(struct ieee80211_ht_operation))
 278                 return;
 279
 280         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 281         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 282
 283         ht_oper = (struct ieee80211_ht_operation *)(ht_oper_ie + 2);
 284
 285         /* determine capability flags */
 286         cap = ht_cap.cap;
 287
 288         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 289         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 290                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 291                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 292                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 293                 }
 294                 break;
 295         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 296                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 297                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 298                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 299                 }
 300                 break;
 301         }
 302
 303         /*
 304          * If 40 MHz was disabled associate as though we weren't
 305          * capable of 40 MHz -- some broken APs will never fall
 306          * back to trying to transmit in 20 MHz.
 307          */
 308         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 309                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 310                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 311         }
 312
 313         /* set SM PS mode properly */
 314         cap &= ~IEEE80211_HT_CAP_SM_PS;
 315         switch (smps) {
 316         case IEEE80211_SMPS_AUTOMATIC:
 317         case IEEE80211_SMPS_NUM_MODES:
 318                 WARN_ON(1);
 319         case IEEE80211_SMPS_OFF:
 320                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 321                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 322                 break;
 323         case IEEE80211_SMPS_STATIC:
 324                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 325                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 326                 break;
 327         case IEEE80211_SMPS_DYNAMIC:
 328                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 329                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 330                 break;
 331         }
 332
 333         /* reserve and fill IE */
 334         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 335         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 336 }
 337
 338 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 339 {
 340         struct ieee80211_local *local = sdata->local;
 341         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 342         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 343         struct sk_buff *skb;
 344         struct ieee80211_mgmt *mgmt;
 345         u8 *pos, qos_info;
 346         size_t offset = 0, noffset;
 347         int i, count, rates_len, supp_rates_len;
 348         u16 capab;
 349         struct ieee80211_supported_band *sband;
 350         u32 rates = 0;
 351
 352         lockdep_assert_held(&ifmgd->mtx);
 353
 354         sband = local->hw.wiphy->bands[local->oper_channel->band];
 355
 356         if (assoc_data->supp_rates_len) {
 357                 /*
 358                  * Get all rates supported by the device and the AP as
 359                  * some APs don't like getting a superset of their rates
 360                  * in the association request (e.g. D-Link DAP 1353 in
 361                  * b-only mode)...
 362                  */
 363                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 364                                                        assoc_data->supp_rates_len,
 365                                                        sband, &rates);
 366         } else {
 367                 /*
 368                  * In case AP not provide any supported rates information
 369                  * before association, we send information element(s) with
 370                  * all rates that we support.
 371                  */
 372                 rates = ~0;
 373                 rates_len = sband->n_bitrates;
 374         }
 375
 376         skb = alloc_skb(local->hw.extra_tx_headroom +
 377                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 378                         2 + assoc_data->ssid_len + /* SSID */
 379                         4 + rates_len + /* (extended) rates */
 380                         4 + /* power capability */
 381                         2 + 2 * sband->n_channels + /* supported channels */
 382                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 383                         assoc_data->ie_len + /* extra IEs */
 384                         9, /* WMM */
 385                         GFP_KERNEL);
 386         if (!skb)
 387                 return;
 388
 389         skb_reserve(skb, local->hw.extra_tx_headroom);
 390
 391         capab = WLAN_CAPABILITY_ESS;
 392
 393         if (sband->band == IEEE80211_BAND_2GHZ) {
 394                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 395                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 396                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 397                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 398         }
 399
 400         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 401                 capab |= WLAN_CAPABILITY_PRIVACY;
 402
 403         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 404             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 405                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 406
 407         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 408         memset(mgmt, 0, 24);
 409         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 410         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 411         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 412
 413         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 414                 skb_put(skb, 10);
 415                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 416                                                   IEEE80211_STYPE_REASSOC_REQ);
 417                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 418                 mgmt->u.reassoc_req.listen_interval =
 419                                 cpu_to_le16(local->hw.conf.listen_interval);
 420                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 421                        ETH_ALEN);
 422         } else {
 423                 skb_put(skb, 4);
 424                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 425                                                   IEEE80211_STYPE_ASSOC_REQ);
 426                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 427                 mgmt->u.assoc_req.listen_interval =
 428                                 cpu_to_le16(local->hw.conf.listen_interval);
 429         }
 430
 431         /* SSID */
 432         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 433         *pos++ = WLAN_EID_SSID;
 434         *pos++ = assoc_data->ssid_len;
 435         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 436
 437         /* add all rates which were marked to be used above */
 438         supp_rates_len = rates_len;
 439         if (supp_rates_len > 8)
 440                 supp_rates_len = 8;
 441
 442         pos = skb_put(skb, supp_rates_len + 2);
 443         *pos++ = WLAN_EID_SUPP_RATES;
 444         *pos++ = supp_rates_len;
 445
 446         count = 0;
 447         for (i = 0; i < sband->n_bitrates; i++) {
 448                 if (BIT(i) & rates) {
 449                         int rate = sband->bitrates[i].bitrate;
 450                         *pos++ = (u8) (rate / 5);
 451                         if (++count == 8)
 452                                 break;
 453                 }
 454         }
 455
 456         if (rates_len > count) {
 457                 pos = skb_put(skb, rates_len - count + 2);
 458                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 459                 *pos++ = rates_len - count;
 460
 461                 for (i++; i < sband->n_bitrates; i++) {
 462                         if (BIT(i) & rates) {
 463                                 int rate = sband->bitrates[i].bitrate;
 464                                 *pos++ = (u8) (rate / 5);
 465                         }
 466                 }
 467         }
 468
 469         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 470                 /* 1. power capabilities */
 471                 pos = skb_put(skb, 4);
 472                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 473                 *pos++ = 2;
 474                 *pos++ = 0; /* min tx power */
 475                 *pos++ = local->oper_channel->max_power; /* max tx power */
 476
 477                 /* 2. supported channels */
 478                 /* TODO: get this in reg domain format */
 479                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 480                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 481                 *pos++ = 2 * sband->n_channels;
 482                 for (i = 0; i < sband->n_channels; i++) {
 483                         *pos++ = ieee80211_frequency_to_channel(
 484                                         sband->channels[i].center_freq);
 485                         *pos++ = 1; /* one channel in the subband*/
 486                 }
 487         }
 488
 489         /* if present, add any custom IEs that go before HT */
 490         if (assoc_data->ie_len && assoc_data->ie) {
 491                 static const u8 before_ht[] = {
 492                         WLAN_EID_SSID,
 493                         WLAN_EID_SUPP_RATES,
 494                         WLAN_EID_EXT_SUPP_RATES,
 495                         WLAN_EID_PWR_CAPABILITY,
 496                         WLAN_EID_SUPPORTED_CHANNELS,
 497                         WLAN_EID_RSN,
 498                         WLAN_EID_QOS_CAPA,
 499                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 500                         WLAN_EID_MOBILITY_DOMAIN,
 501                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 502                 };
 503                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 504                                              before_ht, ARRAY_SIZE(before_ht),
 505                                              offset);
 506                 pos = skb_put(skb, noffset - offset);
 507                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 508                 offset = noffset;
 509         }
 510
 511         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 512                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ht_operation_ie,
 513                                     sband, local->oper_channel, ifmgd->ap_smps);
 514
 515         /* if present, add any custom non-vendor IEs that go after HT */
 516         if (assoc_data->ie_len && assoc_data->ie) {
 517                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 518                                                     assoc_data->ie_len,
 519                                                     offset);
 520                 pos = skb_put(skb, noffset - offset);
 521                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 522                 offset = noffset;
 523         }
 524
 525         if (assoc_data->wmm) {
 526                 if (assoc_data->uapsd) {
 527                         qos_info = ifmgd->uapsd_queues;
 528                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 529                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 530                 } else {
 531                         qos_info = 0;
 532                 }
 533
 534                 pos = skb_put(skb, 9);
 535                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 536                 *pos++ = 7; /* len */
 537                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 538                 *pos++ = 0x50;
 539                 *pos++ = 0xf2;
 540                 *pos++ = 2; /* WME */
 541                 *pos++ = 0; /* WME info */
 542                 *pos++ = 1; /* WME ver */
 543                 *pos++ = qos_info;
 544         }
 545
 546         /* add any remaining custom (i.e. vendor specific here) IEs */
 547         if (assoc_data->ie_len && assoc_data->ie) {
 548                 noffset = assoc_data->ie_len;
 549                 pos = skb_put(skb, noffset - offset);
 550                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 551         }
 552
 553         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 554         ieee80211_tx_skb(sdata, skb);
 555 }
 556
 557 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 558                                            const u8 *bssid, u16 stype,
 559                                            u16 reason, bool send_frame,
 560                                            u8 *frame_buf)
 561 {
 562         struct ieee80211_local *local = sdata->local;
 563         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 564         struct sk_buff *skb;
 565         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 566
 567         /* build frame */
 568         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 569         mgmt->duration = 0; /* initialize only */
 570         mgmt->seq_ctrl = 0; /* initialize only */
 571         memcpy(mgmt->da, bssid, ETH_ALEN);
 572         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 573         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 574         /* u.deauth.reason_code == u.disassoc.reason_code */
 575         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 576
 577         if (send_frame) {
 578                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 579                                     DEAUTH_DISASSOC_LEN);
 580                 if (!skb)
 581                         return;
 582
 583                 skb_reserve(skb, local->hw.extra_tx_headroom);
 584
 585                 /* copy in frame */
 586                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 587                        mgmt, DEAUTH_DISASSOC_LEN);
 588
 589                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 590                         IEEE80211_SKB_CB(skb)->flags |=
 591                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
 592                 ieee80211_tx_skb(sdata, skb);
 593         }
 594 }
 595
 596 void ieee80211_send_pspoll(struct ieee80211_local *local,
 597                            struct ieee80211_sub_if_data *sdata)
 598 {
 599         struct ieee80211_pspoll *pspoll;
 600         struct sk_buff *skb;
 601
 602         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 603         if (!skb)
 604                 return;
 605
 606         pspoll = (struct ieee80211_pspoll *) skb->data;
 607         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 608
 609         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 610         ieee80211_tx_skb(sdata, skb);
 611 }
 612
 613 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 614                              struct ieee80211_sub_if_data *sdata,
 615                              int powersave)
 616 {
 617         struct sk_buff *skb;
 618         struct ieee80211_hdr_3addr *nullfunc;
 619         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 620
 621         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 622         if (!skb)
 623                 return;
 624
 625         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 626         if (powersave)
 627                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 628
 629         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 630         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 631                             IEEE80211_STA_CONNECTION_POLL))
 632                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 633
 634         ieee80211_tx_skb(sdata, skb);
 635 }
 636
 637 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 638                                           struct ieee80211_sub_if_data *sdata)
 639 {
 640         struct sk_buff *skb;
 641         struct ieee80211_hdr *nullfunc;
 642         __le16 fc;
 643
 644         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 645                 return;
 646
 647         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 648         if (!skb)
 649                 return;
 650
 651         skb_reserve(skb, local->hw.extra_tx_headroom);
 652
 653         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 654         memset(nullfunc, 0, 30);
 655         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 656                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 657         nullfunc->frame_control = fc;
 658         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 659         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 660         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 661         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 662
 663         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 664         ieee80211_tx_skb(sdata, skb);
 665 }
 666
 667 /* spectrum management related things */
 668 static void ieee80211_chswitch_work(struct work_struct *work)
 669 {
 670         struct ieee80211_sub_if_data *sdata =
 671                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 672         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 673
 674         if (!ieee80211_sdata_running(sdata))
 675                 return;
 676
 677         mutex_lock(&ifmgd->mtx);
 678         if (!ifmgd->associated)
 679                 goto out;
 680
 681         sdata->local->oper_channel = sdata->local->csa_channel;
 682         if (!sdata->local->ops->channel_switch) {
 683                 /* call "hw_config" only if doing sw channel switch */
 684                 ieee80211_hw_config(sdata->local,
 685                         IEEE80211_CONF_CHANGE_CHANNEL);
 686         } else {
 687                 /* update the device channel directly */
 688                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 689         }
 690
 691         /* XXX: shouldn't really modify cfg80211-owned data! */
 692         ifmgd->associated->channel = sdata->local->oper_channel;
 693
 694         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 695                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 696  out:
 697         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 698         mutex_unlock(&ifmgd->mtx);
 699 }
 700
 701 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 702 {
 703         struct ieee80211_sub_if_data *sdata;
 704         struct ieee80211_if_managed *ifmgd;
 705
 706         sdata = vif_to_sdata(vif);
 707         ifmgd = &sdata->u.mgd;
 708
 709         trace_api_chswitch_done(sdata, success);
 710         if (!success) {
 711                 /*
 712                  * If the channel switch was not successful, stay
 713                  * around on the old channel. We currently lack
 714                  * good handling of this situation, possibly we
 715                  * should just drop the association.
 716                  */
 717                 sdata->local->csa_channel = sdata->local->oper_channel;
 718         }
 719
 720         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 721 }
 722 EXPORT_SYMBOL(ieee80211_chswitch_done);
 723
 724 static void ieee80211_chswitch_timer(unsigned long data)
 725 {
 726         struct ieee80211_sub_if_data *sdata =
 727                 (struct ieee80211_sub_if_data *) data;
 728         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 729
 730         if (sdata->local->quiescing) {
 731                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 732                 return;
 733         }
 734
 735         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 736 }
 737
 738 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 739                                       struct ieee80211_channel_sw_ie *sw_elem,
 740                                       struct ieee80211_bss *bss,
 741                                       u64 timestamp)
 742 {
 743         struct cfg80211_bss *cbss =
 744                 container_of((void *)bss, struct cfg80211_bss, priv);
 745         struct ieee80211_channel *new_ch;
 746         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 747         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 748                                                       cbss->channel->band);
 749
 750         ASSERT_MGD_MTX(ifmgd);
 751
 752         if (!ifmgd->associated)
 753                 return;
 754
 755         if (sdata->local->scanning)
 756                 return;
 757
 758         /* Disregard subsequent beacons if we are already running a timer
 759            processing a CSA */
 760
 761         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 762                 return;
 763
 764         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 765         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 766                 return;
 767
 768         sdata->local->csa_channel = new_ch;
 769
 770         if (sdata->local->ops->channel_switch) {
 771                 /* use driver's channel switch callback */
 772                 struct ieee80211_channel_switch ch_switch;
 773                 memset(&ch_switch, 0, sizeof(ch_switch));
 774                 ch_switch.timestamp = timestamp;
 775                 if (sw_elem->mode) {
 776                         ch_switch.block_tx = true;
 777                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 778                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 779                 }
 780                 ch_switch.channel = new_ch;
 781                 ch_switch.count = sw_elem->count;
 782                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 783                 drv_channel_switch(sdata->local, &ch_switch);
 784                 return;
 785         }
 786
 787         /* channel switch handled in software */
 788         if (sw_elem->count <= 1) {
 789                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 790         } else {
 791                 if (sw_elem->mode)
 792                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 793                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 794                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 795                 mod_timer(&ifmgd->chswitch_timer,
 796                           jiffies +
 797                           msecs_to_jiffies(sw_elem->count *
 798                                            cbss->beacon_interval));
 799         }
 800 }
 801
 802 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 803                                         u16 capab_info, u8 *pwr_constr_elem,
 804                                         u8 pwr_constr_elem_len)
 805 {
 806         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 807
 808         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 809                 return;
 810
 811         /* Power constraint IE length should be 1 octet */
 812         if (pwr_constr_elem_len != 1)
 813                 return;
 814
 815         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 816             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 817                 sdata->local->power_constr_level = *pwr_constr_elem;
 818                 ieee80211_hw_config(sdata->local, 0);
 819         }
 820 }
 821
 822 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 823 {
 824         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 825         struct ieee80211_local *local = sdata->local;
 826         struct ieee80211_conf *conf = &local->hw.conf;
 827
 828         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 829                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 830                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 831
 832         local->disable_dynamic_ps = false;
 833         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 834 }
 835 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 836
 837 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 838 {
 839         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 840         struct ieee80211_local *local = sdata->local;
 841         struct ieee80211_conf *conf = &local->hw.conf;
 842
 843         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 844                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 845                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 846
 847         local->disable_dynamic_ps = true;
 848         conf->dynamic_ps_timeout = 0;
 849         del_timer_sync(&local->dynamic_ps_timer);
 850         ieee80211_queue_work(&local->hw,
 851                              &local->dynamic_ps_enable_work);
 852 }
 853 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 854
 855 /* powersave */
 856 static void ieee80211_enable_ps(struct ieee80211_local *local,
 857                                 struct ieee80211_sub_if_data *sdata)
 858 {
 859         struct ieee80211_conf *conf = &local->hw.conf;
 860
 861         /*
 862          * If we are scanning right now then the parameters will
 863          * take effect when scan finishes.
 864          */
 865         if (local->scanning)
 866                 return;
 867
 868         if (conf->dynamic_ps_timeout > 0 &&
 869             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 870                 mod_timer(&local->dynamic_ps_timer, jiffies +
 871                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 872         } else {
 873                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 874                         ieee80211_send_nullfunc(local, sdata, 1);
 875
 876                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 877                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 878                         return;
 879
 880                 conf->flags |= IEEE80211_CONF_PS;
 881                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 882         }
 883 }
 884
 885 static void ieee80211_change_ps(struct ieee80211_local *local)
 886 {
 887         struct ieee80211_conf *conf = &local->hw.conf;
 888
 889         if (local->ps_sdata) {
 890                 ieee80211_enable_ps(local, local->ps_sdata);
 891         } else if (conf->flags & IEEE80211_CONF_PS) {
 892                 conf->flags &= ~IEEE80211_CONF_PS;
 893                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 894                 del_timer_sync(&local->dynamic_ps_timer);
 895                 cancel_work_sync(&local->dynamic_ps_enable_work);
 896         }
 897 }
 898
 899 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 900 {
 901         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 902         struct sta_info *sta = NULL;
 903         bool authorized = false;
 904
 905         if (!mgd->powersave)
 906                 return false;
 907
 908         if (mgd->broken_ap)
 909                 return false;
 910
 911         if (!mgd->associated)
 912                 return false;
 913
 914         if (!mgd->associated->beacon_ies)
 915                 return false;
 916
 917         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 918                           IEEE80211_STA_CONNECTION_POLL))
 919                 return false;
 920
 921         rcu_read_lock();
 922         sta = sta_info_get(sdata, mgd->bssid);
 923         if (sta)
 924                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 925         rcu_read_unlock();
 926
 927         return authorized;
 928 }
 929
 930 /* need to hold RTNL or interface lock */
 931 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 932 {
 933         struct ieee80211_sub_if_data *sdata, *found = NULL;
 934         int count = 0;
 935         int timeout;
 936
 937         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 938                 local->ps_sdata = NULL;
 939                 return;
 940         }
 941
 942         if (!list_empty(&local->work_list)) {
 943                 local->ps_sdata = NULL;
 944                 goto change;
 945         }
 946
 947         list_for_each_entry(sdata, &local->interfaces, list) {
 948                 if (!ieee80211_sdata_running(sdata))
 949                         continue;
 950                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 951                         /* If an AP vif is found, then disable PS
 952                          * by setting the count to zero thereby setting
 953                          * ps_sdata to NULL.
 954                          */
 955                         count = 0;
 956                         break;
 957                 }
 958                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 959                         continue;
 960                 found = sdata;
 961                 count++;
 962         }
 963
 964         if (count == 1 && ieee80211_powersave_allowed(found)) {
 965                 struct ieee80211_conf *conf = &local->hw.conf;
 966                 s32 beaconint_us;
 967
 968                 if (latency < 0)
 969                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 970
 971                 beaconint_us = ieee80211_tu_to_usec(
 972                                         found->vif.bss_conf.beacon_int);
 973
 974                 timeout = local->dynamic_ps_forced_timeout;
 975                 if (timeout < 0) {
 976                         /*
 977                          * Go to full PSM if the user configures a very low
 978                          * latency requirement.
 979                          * The 2000 second value is there for compatibility
 980                          * until the PM_QOS_NETWORK_LATENCY is configured
 981                          * with real values.
 982                          */
 983                         if (latency > (1900 * USEC_PER_MSEC) &&
 984                             latency != (2000 * USEC_PER_SEC))
 985                                 timeout = 0;
 986                         else
 987                                 timeout = 100;
 988                 }
 989                 local->dynamic_ps_user_timeout = timeout;
 990                 if (!local->disable_dynamic_ps)
 991                         conf->dynamic_ps_timeout =
 992                                 local->dynamic_ps_user_timeout;
 993
 994                 if (beaconint_us > latency) {
 995                         local->ps_sdata = NULL;
 996                 } else {
 997                         struct ieee80211_bss *bss;
 998                         int maxslp = 1;
 999                         u8 dtimper;
1000
1001                         bss = (void *)found->u.mgd.associated->priv;
1002                         dtimper = bss->dtim_period;
1003
1004                         /* If the TIM IE is invalid, pretend the value is 1 */
1005                         if (!dtimper)
1006                                 dtimper = 1;
1007                         else if (dtimper > 1)
1008                                 maxslp = min_t(int, dtimper,
1009                                                     latency / beaconint_us);
1010
1011                         local->hw.conf.max_sleep_period = maxslp;
1012                         local->hw.conf.ps_dtim_period = dtimper;
1013                         local->ps_sdata = found;
1014                 }
1015         } else {
1016                 local->ps_sdata = NULL;
1017         }
1018
1019  change:
1020         ieee80211_change_ps(local);
1021 }
1022
1023 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1024 {
1025         struct ieee80211_local *local =
1026                 container_of(work, struct ieee80211_local,
1027                              dynamic_ps_disable_work);
1028
1029         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1030                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1031                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1032         }
1033
1034         ieee80211_wake_queues_by_reason(&local->hw,
1035                                         IEEE80211_QUEUE_STOP_REASON_PS);
1036 }
1037
1038 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1039 {
1040         struct ieee80211_local *local =
1041                 container_of(work, struct ieee80211_local,
1042                              dynamic_ps_enable_work);
1043         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1044         struct ieee80211_if_managed *ifmgd;
1045         unsigned long flags;
1046         int q;
1047
1048         /* can only happen when PS was just disabled anyway */
1049         if (!sdata)
1050                 return;
1051
1052         ifmgd = &sdata->u.mgd;
1053
1054         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1055                 return;
1056
1057         if (!local->disable_dynamic_ps &&
1058             local->hw.conf.dynamic_ps_timeout > 0) {
1059                 /* don't enter PS if TX frames are pending */
1060                 if (drv_tx_frames_pending(local)) {
1061                         mod_timer(&local->dynamic_ps_timer, jiffies +
1062                                   msecs_to_jiffies(
1063                                   local->hw.conf.dynamic_ps_timeout));
1064                         return;
1065                 }
1066
1067                 /*
1068                  * transmission can be stopped by others which leads to
1069                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1070                  * is not the actual idle state.
1071                  */
1072                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1073                 for (q = 0; q < local->hw.queues; q++) {
1074                         if (local->queue_stop_reasons[q]) {
1075                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1076                                                        flags);
1077                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1078                                           msecs_to_jiffies(
1079                                           local->hw.conf.dynamic_ps_timeout));
1080                                 return;
1081                         }
1082                 }
1083                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1084         }
1085
1086         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1087             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1088                 netif_tx_stop_all_queues(sdata->dev);
1089
1090                 if (drv_tx_frames_pending(local))
1091                         mod_timer(&local->dynamic_ps_timer, jiffies +
1092                                   msecs_to_jiffies(
1093                                   local->hw.conf.dynamic_ps_timeout));
1094                 else {
1095                         ieee80211_send_nullfunc(local, sdata, 1);
1096                         /* Flush to get the tx status of nullfunc frame */
1097                         drv_flush(local, false);
1098                 }
1099         }
1100
1101         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1102               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1103             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1104                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1105                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1106                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1107         }
1108
1109         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1110                 netif_tx_wake_all_queues(sdata->dev);
1111 }
1112
1113 void ieee80211_dynamic_ps_timer(unsigned long data)
1114 {
1115         struct ieee80211_local *local = (void *) data;
1116
1117         if (local->quiescing || local->suspended)
1118                 return;
1119
1120         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1121 }
1122
1123 /* MLME */
1124 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
1125                                      struct ieee80211_sub_if_data *sdata,
1126                                      u8 *wmm_param, size_t wmm_param_len)
1127 {
1128         struct ieee80211_tx_queue_params params;
1129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1130         size_t left;
1131         int count;
1132         u8 *pos, uapsd_queues = 0;
1133
1134         if (!local->ops->conf_tx)
1135                 return;
1136
1137         if (local->hw.queues < 4)
1138                 return;
1139
1140         if (!wmm_param)
1141                 return;
1142
1143         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1144                 return;
1145
1146         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1147                 uapsd_queues = ifmgd->uapsd_queues;
1148
1149         count = wmm_param[6] & 0x0f;
1150         if (count == ifmgd->wmm_last_param_set)
1151                 return;
1152         ifmgd->wmm_last_param_set = count;
1153
1154         pos = wmm_param + 8;
1155         left = wmm_param_len - 8;
1156
1157         memset(&params, 0, sizeof(params));
1158
1159         local->wmm_acm = 0;
1160         for (; left >= 4; left -= 4, pos += 4) {
1161                 int aci = (pos[0] >> 5) & 0x03;
1162                 int acm = (pos[0] >> 4) & 0x01;
1163                 bool uapsd = false;
1164                 int queue;
1165
1166                 switch (aci) {
1167                 case 1: /* AC_BK */
1168                         queue = 3;
1169                         if (acm)
1170                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1171                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1172                                 uapsd = true;
1173                         break;
1174                 case 2: /* AC_VI */
1175                         queue = 1;
1176                         if (acm)
1177                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1178                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1179                                 uapsd = true;
1180                         break;
1181                 case 3: /* AC_VO */
1182                         queue = 0;
1183                         if (acm)
1184                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1185                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1186                                 uapsd = true;
1187                         break;
1188                 case 0: /* AC_BE */
1189                 default:
1190                         queue = 2;
1191                         if (acm)
1192                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1193                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1194                                 uapsd = true;
1195                         break;
1196                 }
1197
1198                 params.aifs = pos[0] & 0x0f;
1199                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1200                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1201                 params.txop = get_unaligned_le16(pos + 2);
1202                 params.uapsd = uapsd;
1203
1204 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1205                 wiphy_debug(local->hw.wiphy,
1206                             "WMM queue=%d aci=%d acm=%d aifs=%d "
1207                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1208                             queue, aci, acm,
1209                             params.aifs, params.cw_min, params.cw_max,
1210                             params.txop, params.uapsd);
1211 #endif
1212                 sdata->tx_conf[queue] = params;
1213                 if (drv_conf_tx(local, sdata, queue, &params))
1214                         wiphy_debug(local->hw.wiphy,
1215                                     "failed to set TX queue parameters for queue %d\n",
1216                                     queue);
1217         }
1218
1219         /* enable WMM or activate new settings */
1220         sdata->vif.bss_conf.qos = true;
1221 }
1222
1223 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1224                                            u16 capab, bool erp_valid, u8 erp)
1225 {
1226         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1227         u32 changed = 0;
1228         bool use_protection;
1229         bool use_short_preamble;
1230         bool use_short_slot;
1231
1232         if (erp_valid) {
1233                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1234                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1235         } else {
1236                 use_protection = false;
1237                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1238         }
1239
1240         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1241         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1242                 use_short_slot = true;
1243
1244         if (use_protection != bss_conf->use_cts_prot) {
1245                 bss_conf->use_cts_prot = use_protection;
1246                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1247         }
1248
1249         if (use_short_preamble != bss_conf->use_short_preamble) {
1250                 bss_conf->use_short_preamble = use_short_preamble;
1251                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1252         }
1253
1254         if (use_short_slot != bss_conf->use_short_slot) {
1255                 bss_conf->use_short_slot = use_short_slot;
1256                 changed |= BSS_CHANGED_ERP_SLOT;
1257         }
1258
1259         return changed;
1260 }
1261
1262 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1263                                      struct cfg80211_bss *cbss,
1264                                      u32 bss_info_changed)
1265 {
1266         struct ieee80211_bss *bss = (void *)cbss->priv;
1267         struct ieee80211_local *local = sdata->local;
1268         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1269
1270         bss_info_changed |= BSS_CHANGED_ASSOC;
1271         /* set timing information */
1272         bss_conf->beacon_int = cbss->beacon_interval;
1273         bss_conf->last_tsf = cbss->tsf;
1274
1275         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1276         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1277                 cbss->capability, bss->has_erp_value, bss->erp_value);
1278
1279         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1280                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1281
1282         sdata->u.mgd.associated = cbss;
1283         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1284
1285         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1286
1287         /* just to be sure */
1288         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1289                                 IEEE80211_STA_BEACON_POLL);
1290
1291         ieee80211_led_assoc(local, 1);
1292
1293         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1294                 bss_conf->dtim_period = bss->dtim_period;
1295         else
1296                 bss_conf->dtim_period = 0;
1297
1298         bss_conf->assoc = 1;
1299
1300         /* Tell the driver to monitor connection quality (if supported) */
1301         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1302             bss_conf->cqm_rssi_thold)
1303                 bss_info_changed |= BSS_CHANGED_CQM;
1304
1305         /* Enable ARP filtering */
1306         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1307                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1308                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1309         }
1310
1311         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1312
1313         mutex_lock(&local->iflist_mtx);
1314         ieee80211_recalc_ps(local, -1);
1315         ieee80211_recalc_smps(local);
1316         mutex_unlock(&local->iflist_mtx);
1317
1318         netif_tx_start_all_queues(sdata->dev);
1319         netif_carrier_on(sdata->dev);
1320 }
1321
1322 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1323                                    u16 stype, u16 reason, bool tx,
1324                                    u8 *frame_buf)
1325 {
1326         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1327         struct ieee80211_local *local = sdata->local;
1328         struct sta_info *sta;
1329         u32 changed = 0;
1330         u8 bssid[ETH_ALEN];
1331
1332         ASSERT_MGD_MTX(ifmgd);
1333
1334         if (WARN_ON_ONCE(tx && !frame_buf))
1335                 return;
1336
1337         if (WARN_ON(!ifmgd->associated))
1338                 return;
1339
1340         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1341
1342         ifmgd->associated = NULL;
1343         memset(ifmgd->bssid, 0, ETH_ALEN);
1344
1345         /*
1346          * we need to commit the associated = NULL change because the
1347          * scan code uses that to determine whether this iface should
1348          * go to/wake up from powersave or not -- and could otherwise
1349          * wake the queues erroneously.
1350          */
1351         smp_mb();
1352
1353         /*
1354          * Thus, we can only afterwards stop the queues -- to account
1355          * for the case where another CPU is finishing a scan at this
1356          * time -- we don't want the scan code to enable queues.
1357          */
1358
1359         netif_tx_stop_all_queues(sdata->dev);
1360         netif_carrier_off(sdata->dev);
1361
1362         mutex_lock(&local->sta_mtx);
1363         sta = sta_info_get(sdata, bssid);
1364         if (sta) {
1365                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1366                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1367         }
1368         mutex_unlock(&local->sta_mtx);
1369
1370         /* deauthenticate/disassociate now */
1371         if (tx || frame_buf)
1372                 ieee80211_send_deauth_disassoc(sdata, bssid, stype, reason,
1373                                                tx, frame_buf);
1374
1375         /* flush out frame */
1376         if (tx)
1377                 drv_flush(local, false);
1378
1379         /* remove AP and TDLS peers */
1380         sta_info_flush(local, sdata);
1381
1382         /* finally reset all BSS / config parameters */
1383         changed |= ieee80211_reset_erp_info(sdata);
1384
1385         ieee80211_led_assoc(local, 0);
1386         changed |= BSS_CHANGED_ASSOC;
1387         sdata->vif.bss_conf.assoc = false;
1388
1389         /* on the next assoc, re-program HT parameters */
1390         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1391         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1392
1393         local->power_constr_level = 0;
1394
1395         del_timer_sync(&local->dynamic_ps_timer);
1396         cancel_work_sync(&local->dynamic_ps_enable_work);
1397
1398         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1399                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1400                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1401         }
1402         local->ps_sdata = NULL;
1403
1404         /* Disable ARP filtering */
1405         if (sdata->vif.bss_conf.arp_filter_enabled) {
1406                 sdata->vif.bss_conf.arp_filter_enabled = false;
1407                 changed |= BSS_CHANGED_ARP_FILTER;
1408         }
1409
1410         sdata->vif.bss_conf.qos = false;
1411         changed |= BSS_CHANGED_QOS;
1412
1413         /* The BSSID (not really interesting) and HT changed */
1414         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1415         ieee80211_bss_info_change_notify(sdata, changed);
1416
1417         /* channel(_type) changes are handled by ieee80211_hw_config */
1418         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1419         ieee80211_hw_config(local, 0);
1420
1421         /* disassociated - set to defaults now */
1422         ieee80211_set_wmm_default(sdata, false);
1423
1424         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1425         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1426         del_timer_sync(&sdata->u.mgd.timer);
1427         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1428 }
1429
1430 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1431                              struct ieee80211_hdr *hdr)
1432 {
1433         /*
1434          * We can postpone the mgd.timer whenever receiving unicast frames
1435          * from AP because we know that the connection is working both ways
1436          * at that time. But multicast frames (and hence also beacons) must
1437          * be ignored here, because we need to trigger the timer during
1438          * data idle periods for sending the periodic probe request to the
1439          * AP we're connected to.
1440          */
1441         if (is_multicast_ether_addr(hdr->addr1))
1442                 return;
1443
1444         ieee80211_sta_reset_conn_monitor(sdata);
1445 }
1446
1447 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1448 {
1449         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1450
1451         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1452                               IEEE80211_STA_CONNECTION_POLL)))
1453             return;
1454
1455         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1456                           IEEE80211_STA_BEACON_POLL);
1457         mutex_lock(&sdata->local->iflist_mtx);
1458         ieee80211_recalc_ps(sdata->local, -1);
1459         mutex_unlock(&sdata->local->iflist_mtx);
1460
1461         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1462                 return;
1463
1464         /*
1465          * We've received a probe response, but are not sure whether
1466          * we have or will be receiving any beacons or data, so let's
1467          * schedule the timers again, just in case.
1468          */
1469         ieee80211_sta_reset_beacon_monitor(sdata);
1470
1471         mod_timer(&ifmgd->conn_mon_timer,
1472                   round_jiffies_up(jiffies +
1473                                    IEEE80211_CONNECTION_IDLE_TIME));
1474 }
1475
1476 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1477                              struct ieee80211_hdr *hdr, bool ack)
1478 {
1479         if (!ieee80211_is_data(hdr->frame_control))
1480             return;
1481
1482         if (ack)
1483                 ieee80211_sta_reset_conn_monitor(sdata);
1484
1485         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1486             sdata->u.mgd.probe_send_count > 0) {
1487                 if (ack)
1488                         sdata->u.mgd.probe_send_count = 0;
1489                 else
1490                         sdata->u.mgd.nullfunc_failed = true;
1491                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1492         }
1493 }
1494
1495 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1496 {
1497         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1498         const u8 *ssid;
1499         u8 *dst = ifmgd->associated->bssid;
1500         u8 unicast_limit = max(1, max_probe_tries - 3);
1501
1502         /*
1503          * Try sending broadcast probe requests for the last three
1504          * probe requests after the first ones failed since some
1505          * buggy APs only support broadcast probe requests.
1506          */
1507         if (ifmgd->probe_send_count >= unicast_limit)
1508                 dst = NULL;
1509
1510         /*
1511          * When the hardware reports an accurate Tx ACK status, it's
1512          * better to send a nullfunc frame instead of a probe request,
1513          * as it will kick us off the AP quickly if we aren't associated
1514          * anymore. The timeout will be reset if the frame is ACKed by
1515          * the AP.
1516          */
1517         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1518                 ifmgd->nullfunc_failed = false;
1519                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1520         } else {
1521                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1522                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1523                                          (u32) -1, true, false);
1524         }
1525
1526         ifmgd->probe_send_count++;
1527         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1528         run_again(ifmgd, ifmgd->probe_timeout);
1529         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1530                 drv_flush(sdata->local, false);
1531 }
1532
1533 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1534                                    bool beacon)
1535 {
1536         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1537         bool already = false;
1538
1539         if (!ieee80211_sdata_running(sdata))
1540                 return;
1541
1542         if (sdata->local->scanning)
1543                 return;
1544
1545         if (sdata->local->tmp_channel)
1546                 return;
1547
1548         mutex_lock(&ifmgd->mtx);
1549
1550         if (!ifmgd->associated)
1551                 goto out;
1552
1553 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1554         if (beacon && net_ratelimit())
1555                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1556                        "- sending probe request\n", sdata->name);
1557 #endif
1558
1559         /*
1560          * The driver/our work has already reported this event or the
1561          * connection monitoring has kicked in and we have already sent
1562          * a probe request. Or maybe the AP died and the driver keeps
1563          * reporting until we disassociate...
1564          *
1565          * In either case we have to ignore the current call to this
1566          * function (except for setting the correct probe reason bit)
1567          * because otherwise we would reset the timer every time and
1568          * never check whether we received a probe response!
1569          */
1570         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1571                             IEEE80211_STA_CONNECTION_POLL))
1572                 already = true;
1573
1574         if (beacon)
1575                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1576         else
1577                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1578
1579         if (already)
1580                 goto out;
1581
1582         mutex_lock(&sdata->local->iflist_mtx);
1583         ieee80211_recalc_ps(sdata->local, -1);
1584         mutex_unlock(&sdata->local->iflist_mtx);
1585
1586         ifmgd->probe_send_count = 0;
1587         ieee80211_mgd_probe_ap_send(sdata);
1588  out:
1589         mutex_unlock(&ifmgd->mtx);
1590 }
1591
1592 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1593                                           struct ieee80211_vif *vif)
1594 {
1595         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1596         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1597         struct sk_buff *skb;
1598         const u8 *ssid;
1599
1600         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1601                 return NULL;
1602
1603         ASSERT_MGD_MTX(ifmgd);
1604
1605         if (!ifmgd->associated)
1606                 return NULL;
1607
1608         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1609         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1610                                         (u32) -1, ssid + 2, ssid[1],
1611                                         NULL, 0, true);
1612
1613         return skb;
1614 }
1615 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1616
1617 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1618 {
1619         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1620         struct ieee80211_local *local = sdata->local;
1621         u8 bssid[ETH_ALEN];
1622         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1623
1624         mutex_lock(&ifmgd->mtx);
1625         if (!ifmgd->associated) {
1626                 mutex_unlock(&ifmgd->mtx);
1627                 return;
1628         }
1629
1630         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1631
1632         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1633                sdata->name, bssid);
1634
1635         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1636                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1637                                false, frame_buf);
1638         mutex_unlock(&ifmgd->mtx);
1639
1640         /*
1641          * must be outside lock due to cfg80211,
1642          * but that's not a problem.
1643          */
1644         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1645
1646         mutex_lock(&local->mtx);
1647         ieee80211_recalc_idle(local);
1648         mutex_unlock(&local->mtx);
1649 }
1650
1651 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1652 {
1653         struct ieee80211_sub_if_data *sdata =
1654                 container_of(work, struct ieee80211_sub_if_data,
1655                              u.mgd.beacon_connection_loss_work);
1656         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1657         struct sta_info *sta;
1658
1659         if (ifmgd->associated) {
1660                 rcu_read_lock();
1661                 sta = sta_info_get(sdata, ifmgd->bssid);
1662                 if (sta)
1663                         sta->beacon_loss_count++;
1664                 rcu_read_unlock();
1665         }
1666
1667         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1668                 __ieee80211_connection_loss(sdata);
1669         else
1670                 ieee80211_mgd_probe_ap(sdata, true);
1671 }
1672
1673 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1674 {
1675         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1676         struct ieee80211_hw *hw = &sdata->local->hw;
1677
1678         trace_api_beacon_loss(sdata);
1679
1680         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1681         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1682 }
1683 EXPORT_SYMBOL(ieee80211_beacon_loss);
1684
1685 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1686 {
1687         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1688         struct ieee80211_hw *hw = &sdata->local->hw;
1689
1690         trace_api_connection_loss(sdata);
1691
1692         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1693         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1694 }
1695 EXPORT_SYMBOL(ieee80211_connection_loss);
1696
1697
1698 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1699                                         bool assoc)
1700 {
1701         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1702
1703         lockdep_assert_held(&sdata->u.mgd.mtx);
1704
1705         if (!assoc) {
1706                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1707
1708                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1709                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1710         }
1711
1712         cfg80211_put_bss(auth_data->bss);
1713         kfree(auth_data);
1714         sdata->u.mgd.auth_data = NULL;
1715 }
1716
1717 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1718                                      struct ieee80211_mgmt *mgmt, size_t len)
1719 {
1720         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1721         u8 *pos;
1722         struct ieee802_11_elems elems;
1723
1724         pos = mgmt->u.auth.variable;
1725         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1726         if (!elems.challenge)
1727                 return;
1728         auth_data->expected_transaction = 4;
1729         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1730                             elems.challenge - 2, elems.challenge_len + 2,
1731                             auth_data->bss->bssid, auth_data->bss->bssid,
1732                             auth_data->key, auth_data->key_len,
1733                             auth_data->key_idx);
1734 }
1735
1736 static enum rx_mgmt_action __must_check
1737 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1738                        struct ieee80211_mgmt *mgmt, size_t len)
1739 {
1740         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1741         u8 bssid[ETH_ALEN];
1742         u16 auth_alg, auth_transaction, status_code;
1743         struct sta_info *sta;
1744
1745         lockdep_assert_held(&ifmgd->mtx);
1746
1747         if (len < 24 + 6)
1748                 return RX_MGMT_NONE;
1749
1750         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1751                 return RX_MGMT_NONE;
1752
1753         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1754
1755         if (compare_ether_addr(bssid, mgmt->bssid))
1756                 return RX_MGMT_NONE;
1757
1758         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1759         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1760         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1761
1762         if (auth_alg != ifmgd->auth_data->algorithm ||
1763             auth_transaction != ifmgd->auth_data->expected_transaction)
1764                 return RX_MGMT_NONE;
1765
1766         if (status_code != WLAN_STATUS_SUCCESS) {
1767                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
1768                        sdata->name, mgmt->sa, status_code);
1769                 goto out;
1770         }
1771
1772         switch (ifmgd->auth_data->algorithm) {
1773         case WLAN_AUTH_OPEN:
1774         case WLAN_AUTH_LEAP:
1775         case WLAN_AUTH_FT:
1776                 break;
1777         case WLAN_AUTH_SHARED_KEY:
1778                 if (ifmgd->auth_data->expected_transaction != 4) {
1779                         ieee80211_auth_challenge(sdata, mgmt, len);
1780                         /* need another frame */
1781                         return RX_MGMT_NONE;
1782                 }
1783                 break;
1784         default:
1785                 WARN_ONCE(1, "invalid auth alg %d",
1786                           ifmgd->auth_data->algorithm);
1787                 return RX_MGMT_NONE;
1788         }
1789
1790         printk(KERN_DEBUG "%s: authenticated\n", sdata->name);
1791  out:
1792         ifmgd->auth_data->done = true;
1793         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1794         run_again(ifmgd, ifmgd->auth_data->timeout);
1795
1796         /* move station state to auth */
1797         mutex_lock(&sdata->local->sta_mtx);
1798         sta = sta_info_get(sdata, bssid);
1799         if (!sta) {
1800                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1801                 goto out_err;
1802         }
1803         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1804                 printk(KERN_DEBUG "%s: failed moving %pM to auth\n",
1805                        sdata->name, bssid);
1806                 goto out_err;
1807         }
1808         mutex_unlock(&sdata->local->sta_mtx);
1809
1810         return RX_MGMT_CFG80211_RX_AUTH;
1811  out_err:
1812         mutex_unlock(&sdata->local->sta_mtx);
1813         /* ignore frame -- wait for timeout */
1814         return RX_MGMT_NONE;
1815 }
1816
1817
1818 static enum rx_mgmt_action __must_check
1819 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1820                          struct ieee80211_mgmt *mgmt, size_t len)
1821 {
1822         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1823         const u8 *bssid = NULL;
1824         u16 reason_code;
1825
1826         lockdep_assert_held(&ifmgd->mtx);
1827
1828         if (len < 24 + 2)
1829                 return RX_MGMT_NONE;
1830
1831         if (!ifmgd->associated ||
1832             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
1833                 return RX_MGMT_NONE;
1834
1835         bssid = ifmgd->associated->bssid;
1836
1837         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1838
1839         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1840                         sdata->name, bssid, reason_code);
1841
1842         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1843
1844         mutex_lock(&sdata->local->mtx);
1845         ieee80211_recalc_idle(sdata->local);
1846         mutex_unlock(&sdata->local->mtx);
1847
1848         return RX_MGMT_CFG80211_DEAUTH;
1849 }
1850
1851
1852 static enum rx_mgmt_action __must_check
1853 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1854                            struct ieee80211_mgmt *mgmt, size_t len)
1855 {
1856         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1857         u16 reason_code;
1858
1859         lockdep_assert_held(&ifmgd->mtx);
1860
1861         if (len < 24 + 2)
1862                 return RX_MGMT_NONE;
1863
1864         if (!ifmgd->associated ||
1865             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
1866                 return RX_MGMT_NONE;
1867
1868         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1869
1870         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1871                         sdata->name, mgmt->sa, reason_code);
1872
1873         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1874
1875         mutex_lock(&sdata->local->mtx);
1876         ieee80211_recalc_idle(sdata->local);
1877         mutex_unlock(&sdata->local->mtx);
1878
1879         return RX_MGMT_CFG80211_DISASSOC;
1880 }
1881
1882 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1883                                 u8 *supp_rates, unsigned int supp_rates_len,
1884                                 u32 *rates, u32 *basic_rates,
1885                                 bool *have_higher_than_11mbit,
1886                                 int *min_rate, int *min_rate_index)
1887 {
1888         int i, j;
1889
1890         for (i = 0; i < supp_rates_len; i++) {
1891                 int rate = (supp_rates[i] & 0x7f) * 5;
1892                 bool is_basic = !!(supp_rates[i] & 0x80);
1893
1894                 if (rate > 110)
1895                         *have_higher_than_11mbit = true;
1896
1897                 /*
1898                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1899                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1900                  *
1901                  * Note: Even through the membership selector and the basic
1902                  *       rate flag share the same bit, they are not exactly
1903                  *       the same.
1904                  */
1905                 if (!!(supp_rates[i] & 0x80) &&
1906                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1907                         continue;
1908
1909                 for (j = 0; j < sband->n_bitrates; j++) {
1910                         if (sband->bitrates[j].bitrate == rate) {
1911                                 *rates |= BIT(j);
1912                                 if (is_basic)
1913                                         *basic_rates |= BIT(j);
1914                                 if (rate < *min_rate) {
1915                                         *min_rate = rate;
1916                                         *min_rate_index = j;
1917                                 }
1918                                 break;
1919                         }
1920                 }
1921         }
1922 }
1923
1924 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1925                                          bool assoc)
1926 {
1927         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1928
1929         lockdep_assert_held(&sdata->u.mgd.mtx);
1930
1931         if (!assoc) {
1932                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1933
1934                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1935                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1936         }
1937
1938         kfree(assoc_data);
1939         sdata->u.mgd.assoc_data = NULL;
1940 }
1941
1942 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
1943                                     struct cfg80211_bss *cbss,
1944                                     struct ieee80211_mgmt *mgmt, size_t len)
1945 {
1946         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1947         struct ieee80211_local *local = sdata->local;
1948         struct ieee80211_supported_band *sband;
1949         struct sta_info *sta;
1950         u8 *pos;
1951         u16 capab_info, aid;
1952         struct ieee802_11_elems elems;
1953         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1954         u32 changed = 0;
1955         int err;
1956
1957         /* AssocResp and ReassocResp have identical structure */
1958
1959         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1960         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1961
1962         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1963                 printk(KERN_DEBUG
1964                        "%s: invalid AID value 0x%x; bits 15:14 not set\n",
1965                        sdata->name, aid);
1966         aid &= ~(BIT(15) | BIT(14));
1967
1968         ifmgd->broken_ap = false;
1969
1970         if (aid == 0 || aid > IEEE80211_MAX_AID) {
1971                 printk(KERN_DEBUG
1972                        "%s: invalid AID value %d (out of range), turn off PS\n",
1973                        sdata->name, aid);
1974                 aid = 0;
1975                 ifmgd->broken_ap = true;
1976         }
1977
1978         pos = mgmt->u.assoc_resp.variable;
1979         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1980
1981         if (!elems.supp_rates) {
1982                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1983                        sdata->name);
1984                 return false;
1985         }
1986
1987         ifmgd->aid = aid;
1988
1989         mutex_lock(&sdata->local->sta_mtx);
1990         /*
1991          * station info was already allocated and inserted before
1992          * the association and should be available to us
1993          */
1994         sta = sta_info_get(sdata, cbss->bssid);
1995         if (WARN_ON(!sta)) {
1996                 mutex_unlock(&sdata->local->sta_mtx);
1997                 return false;
1998         }
1999
2000         sband = local->hw.wiphy->bands[local->oper_channel->band];
2001
2002         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2003                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2004                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2005
2006         sta->supports_40mhz =
2007                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2008
2009         rate_control_rate_init(sta);
2010
2011         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2012                 set_sta_flag(sta, WLAN_STA_MFP);
2013
2014         if (elems.wmm_param)
2015                 set_sta_flag(sta, WLAN_STA_WME);
2016
2017         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2018         if (!err)
2019                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2020         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2021                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2022         if (err) {
2023                 printk(KERN_DEBUG
2024                        "%s: failed to move station %pM to desired state\n",
2025                        sdata->name, sta->sta.addr);
2026                 WARN_ON(__sta_info_destroy(sta));
2027                 mutex_unlock(&sdata->local->sta_mtx);
2028                 return false;
2029         }
2030
2031         mutex_unlock(&sdata->local->sta_mtx);
2032
2033         /*
2034          * Always handle WMM once after association regardless
2035          * of the first value the AP uses. Setting -1 here has
2036          * that effect because the AP values is an unsigned
2037          * 4-bit value.
2038          */
2039         ifmgd->wmm_last_param_set = -1;
2040
2041         if (elems.wmm_param)
2042                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2043                                          elems.wmm_param_len);
2044         else
2045                 ieee80211_set_wmm_default(sdata, false);
2046         changed |= BSS_CHANGED_QOS;
2047
2048         if (elems.ht_operation && elems.wmm_param &&
2049             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2050                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2051                                                   cbss->bssid, false);
2052
2053         /* set AID and assoc capability,
2054          * ieee80211_set_associated() will tell the driver */
2055         bss_conf->aid = aid;
2056         bss_conf->assoc_capability = capab_info;
2057         ieee80211_set_associated(sdata, cbss, changed);
2058
2059         /*
2060          * If we're using 4-addr mode, let the AP know that we're
2061          * doing so, so that it can create the STA VLAN on its side
2062          */
2063         if (ifmgd->use_4addr)
2064                 ieee80211_send_4addr_nullfunc(local, sdata);
2065
2066         /*
2067          * Start timer to probe the connection to the AP now.
2068          * Also start the timer that will detect beacon loss.
2069          */
2070         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2071         ieee80211_sta_reset_beacon_monitor(sdata);
2072
2073         return true;
2074 }
2075
2076 static enum rx_mgmt_action __must_check
2077 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2078                              struct ieee80211_mgmt *mgmt, size_t len,
2079                              struct cfg80211_bss **bss)
2080 {
2081         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2082         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2083         u16 capab_info, status_code, aid;
2084         struct ieee802_11_elems elems;
2085         u8 *pos;
2086         bool reassoc;
2087
2088         lockdep_assert_held(&ifmgd->mtx);
2089
2090         if (!assoc_data)
2091                 return RX_MGMT_NONE;
2092         if (compare_ether_addr(assoc_data->bss->bssid, mgmt->bssid))
2093                 return RX_MGMT_NONE;
2094
2095         /*
2096          * AssocResp and ReassocResp have identical structure, so process both
2097          * of them in this function.
2098          */
2099
2100         if (len < 24 + 6)
2101                 return RX_MGMT_NONE;
2102
2103         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2104         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2105         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2106         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2107
2108         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
2109                "status=%d aid=%d)\n",
2110                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
2111                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2112
2113         pos = mgmt->u.assoc_resp.variable;
2114         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2115
2116         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2117             elems.timeout_int && elems.timeout_int_len == 5 &&
2118             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2119                 u32 tu, ms;
2120                 tu = get_unaligned_le32(elems.timeout_int + 1);
2121                 ms = tu * 1024 / 1000;
2122                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
2123                        "comeback duration %u TU (%u ms)\n",
2124                        sdata->name, mgmt->sa, tu, ms);
2125                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2126                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2127                         run_again(ifmgd, assoc_data->timeout);
2128                 return RX_MGMT_NONE;
2129         }
2130
2131         *bss = assoc_data->bss;
2132
2133         if (status_code != WLAN_STATUS_SUCCESS) {
2134                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
2135                        sdata->name, mgmt->sa, status_code);
2136                 ieee80211_destroy_assoc_data(sdata, false);
2137         } else {
2138                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
2139
2140                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2141                         /* oops -- internal error -- send timeout for now */
2142                         ieee80211_destroy_assoc_data(sdata, true);
2143                         sta_info_destroy_addr(sdata, mgmt->bssid);
2144                         cfg80211_put_bss(*bss);
2145                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2146                 }
2147
2148                 /*
2149                  * destroy assoc_data afterwards, as otherwise an idle
2150                  * recalc after assoc_data is NULL but before associated
2151                  * is set can cause the interface to go idle
2152                  */
2153                 ieee80211_destroy_assoc_data(sdata, true);
2154         }
2155
2156         return RX_MGMT_CFG80211_RX_ASSOC;
2157 }
2158 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2159                                   struct ieee80211_mgmt *mgmt,
2160                                   size_t len,
2161                                   struct ieee80211_rx_status *rx_status,
2162                                   struct ieee802_11_elems *elems,
2163                                   bool beacon)
2164 {
2165         struct ieee80211_local *local = sdata->local;
2166         int freq;
2167         struct ieee80211_bss *bss;
2168         struct ieee80211_channel *channel;
2169         bool need_ps = false;
2170
2171         if (sdata->u.mgd.associated &&
2172             compare_ether_addr(mgmt->bssid, sdata->u.mgd.associated->bssid)
2173             == 0) {
2174                 bss = (void *)sdata->u.mgd.associated->priv;
2175                 /* not previously set so we may need to recalc */
2176                 need_ps = !bss->dtim_period;
2177         }
2178
2179         if (elems->ds_params && elems->ds_params_len == 1)
2180                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2181                                                       rx_status->band);
2182         else
2183                 freq = rx_status->freq;
2184
2185         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2186
2187         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2188                 return;
2189
2190         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2191                                         channel, beacon);
2192         if (bss)
2193                 ieee80211_rx_bss_put(local, bss);
2194
2195         if (!sdata->u.mgd.associated)
2196                 return;
2197
2198         if (need_ps) {
2199                 mutex_lock(&local->iflist_mtx);
2200                 ieee80211_recalc_ps(local, -1);
2201                 mutex_unlock(&local->iflist_mtx);
2202         }
2203
2204         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2205             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2206                                                         ETH_ALEN) == 0)) {
2207                 struct ieee80211_channel_sw_ie *sw_elem =
2208                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2209                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2210                                                  bss, rx_status->mactime);
2211         }
2212 }
2213
2214
2215 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2216                                          struct sk_buff *skb)
2217 {
2218         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2219         struct ieee80211_if_managed *ifmgd;
2220         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2221         size_t baselen, len = skb->len;
2222         struct ieee802_11_elems elems;
2223
2224         ifmgd = &sdata->u.mgd;
2225
2226         ASSERT_MGD_MTX(ifmgd);
2227
2228         if (compare_ether_addr(mgmt->da, sdata->vif.addr))
2229                 return; /* ignore ProbeResp to foreign address */
2230
2231         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2232         if (baselen > len)
2233                 return;
2234
2235         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2236                                 &elems);
2237
2238         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2239
2240         if (ifmgd->associated &&
2241             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid) == 0)
2242                 ieee80211_reset_ap_probe(sdata);
2243
2244         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2245             compare_ether_addr(mgmt->bssid, ifmgd->auth_data->bss->bssid)
2246             == 0) {
2247                 /* got probe response, continue with auth */
2248                 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
2249                 ifmgd->auth_data->tries = 0;
2250                 ifmgd->auth_data->timeout = jiffies;
2251                 run_again(ifmgd, ifmgd->auth_data->timeout);
2252         }
2253 }
2254
2255 /*
2256  * This is the canonical list of information elements we care about,
2257  * the filter code also gives us all changes to the Microsoft OUI
2258  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2259  *
2260  * We implement beacon filtering in software since that means we can
2261  * avoid processing the frame here and in cfg80211, and userspace
2262  * will not be able to tell whether the hardware supports it or not.
2263  *
2264  * XXX: This list needs to be dynamic -- userspace needs to be able to
2265  *      add items it requires. It also needs to be able to tell us to
2266  *      look out for other vendor IEs.
2267  */
2268 static const u64 care_about_ies =
2269         (1ULL << WLAN_EID_COUNTRY) |
2270         (1ULL << WLAN_EID_ERP_INFO) |
2271         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2272         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2273         (1ULL << WLAN_EID_HT_CAPABILITY) |
2274         (1ULL << WLAN_EID_HT_OPERATION);
2275
2276 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2277                                      struct ieee80211_mgmt *mgmt,
2278                                      size_t len,
2279                                      struct ieee80211_rx_status *rx_status)
2280 {
2281         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2282         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2283         size_t baselen;
2284         struct ieee802_11_elems elems;
2285         struct ieee80211_local *local = sdata->local;
2286         u32 changed = 0;
2287         bool erp_valid, directed_tim = false;
2288         u8 erp_value = 0;
2289         u32 ncrc;
2290         u8 *bssid;
2291
2292         lockdep_assert_held(&ifmgd->mtx);
2293
2294         /* Process beacon from the current BSS */
2295         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2296         if (baselen > len)
2297                 return;
2298
2299         if (rx_status->freq != local->hw.conf.channel->center_freq)
2300                 return;
2301
2302         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2303             compare_ether_addr(mgmt->bssid, ifmgd->assoc_data->bss->bssid)
2304             == 0) {
2305                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2306                                        len - baselen, &elems);
2307
2308                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2309                                       false);
2310                 ifmgd->assoc_data->have_beacon = true;
2311                 ifmgd->assoc_data->sent_assoc = false;
2312                 /* continue assoc process */
2313                 ifmgd->assoc_data->timeout = jiffies;
2314                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2315                 return;
2316         }
2317
2318         if (!ifmgd->associated ||
2319             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
2320                 return;
2321         bssid = ifmgd->associated->bssid;
2322
2323         /* Track average RSSI from the Beacon frames of the current AP */
2324         ifmgd->last_beacon_signal = rx_status->signal;
2325         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2326                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2327                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2328                 ifmgd->last_cqm_event_signal = 0;
2329                 ifmgd->count_beacon_signal = 1;
2330                 ifmgd->last_ave_beacon_signal = 0;
2331         } else {
2332                 ifmgd->ave_beacon_signal =
2333                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2334                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2335                          ifmgd->ave_beacon_signal) / 16;
2336                 ifmgd->count_beacon_signal++;
2337         }
2338
2339         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2340             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2341                 int sig = ifmgd->ave_beacon_signal;
2342                 int last_sig = ifmgd->last_ave_beacon_signal;
2343
2344                 /*
2345                  * if signal crosses either of the boundaries, invoke callback
2346                  * with appropriate parameters
2347                  */
2348                 if (sig > ifmgd->rssi_max_thold &&
2349                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2350                         ifmgd->last_ave_beacon_signal = sig;
2351                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2352                 } else if (sig < ifmgd->rssi_min_thold &&
2353                            (last_sig >= ifmgd->rssi_max_thold ||
2354                            last_sig == 0)) {
2355                         ifmgd->last_ave_beacon_signal = sig;
2356                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2357                 }
2358         }
2359
2360         if (bss_conf->cqm_rssi_thold &&
2361             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2362             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2363                 int sig = ifmgd->ave_beacon_signal / 16;
2364                 int last_event = ifmgd->last_cqm_event_signal;
2365                 int thold = bss_conf->cqm_rssi_thold;
2366                 int hyst = bss_conf->cqm_rssi_hyst;
2367                 if (sig < thold &&
2368                     (last_event == 0 || sig < last_event - hyst)) {
2369                         ifmgd->last_cqm_event_signal = sig;
2370                         ieee80211_cqm_rssi_notify(
2371                                 &sdata->vif,
2372                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2373                                 GFP_KERNEL);
2374                 } else if (sig > thold &&
2375                            (last_event == 0 || sig > last_event + hyst)) {
2376                         ifmgd->last_cqm_event_signal = sig;
2377                         ieee80211_cqm_rssi_notify(
2378                                 &sdata->vif,
2379                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2380                                 GFP_KERNEL);
2381                 }
2382         }
2383
2384         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2385 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2386                 if (net_ratelimit()) {
2387                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
2388                                "to a received beacon\n", sdata->name);
2389                 }
2390 #endif
2391                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2392                 mutex_lock(&local->iflist_mtx);
2393                 ieee80211_recalc_ps(local, -1);
2394                 mutex_unlock(&local->iflist_mtx);
2395         }
2396
2397         /*
2398          * Push the beacon loss detection into the future since
2399          * we are processing a beacon from the AP just now.
2400          */
2401         ieee80211_sta_reset_beacon_monitor(sdata);
2402
2403         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2404         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2405                                           len - baselen, &elems,
2406                                           care_about_ies, ncrc);
2407
2408         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2409                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2410                                                    ifmgd->aid);
2411
2412         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
2413                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2414                                       true);
2415
2416                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2417                                          elems.wmm_param_len);
2418         }
2419
2420         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2421                 if (directed_tim) {
2422                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2423                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2424                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2425                                         ieee80211_hw_config(local,
2426                                                             IEEE80211_CONF_CHANGE_PS);
2427                                 }
2428                                 ieee80211_send_nullfunc(local, sdata, 0);
2429                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2430                                 local->pspolling = true;
2431
2432                                 /*
2433                                  * Here is assumed that the driver will be
2434                                  * able to send ps-poll frame and receive a
2435                                  * response even though power save mode is
2436                                  * enabled, but some drivers might require
2437                                  * to disable power save here. This needs
2438                                  * to be investigated.
2439                                  */
2440                                 ieee80211_send_pspoll(local, sdata);
2441                         }
2442                 }
2443         }
2444
2445         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2446                 return;
2447         ifmgd->beacon_crc = ncrc;
2448         ifmgd->beacon_crc_valid = true;
2449
2450         if (elems.erp_info && elems.erp_info_len >= 1) {
2451                 erp_valid = true;
2452                 erp_value = elems.erp_info[0];
2453         } else {
2454                 erp_valid = false;
2455         }
2456         changed |= ieee80211_handle_bss_capability(sdata,
2457                         le16_to_cpu(mgmt->u.beacon.capab_info),
2458                         erp_valid, erp_value);
2459
2460
2461         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2462             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2463                 struct ieee80211_supported_band *sband;
2464
2465                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2466
2467                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2468                                                   bssid, true);
2469         }
2470
2471         /* Note: country IE parsing is done for us by cfg80211 */
2472         if (elems.country_elem) {
2473                 /* TODO: IBSS also needs this */
2474                 if (elems.pwr_constr_elem)
2475                         ieee80211_handle_pwr_constr(sdata,
2476                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2477                                 elems.pwr_constr_elem,
2478                                 elems.pwr_constr_elem_len);
2479         }
2480
2481         ieee80211_bss_info_change_notify(sdata, changed);
2482 }
2483
2484 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2485                                   struct sk_buff *skb)
2486 {
2487         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2488         struct ieee80211_rx_status *rx_status;
2489         struct ieee80211_mgmt *mgmt;
2490         struct cfg80211_bss *bss = NULL;
2491         enum rx_mgmt_action rma = RX_MGMT_NONE;
2492         u16 fc;
2493
2494         rx_status = (struct ieee80211_rx_status *) skb->cb;
2495         mgmt = (struct ieee80211_mgmt *) skb->data;
2496         fc = le16_to_cpu(mgmt->frame_control);
2497
2498         mutex_lock(&ifmgd->mtx);
2499
2500         switch (fc & IEEE80211_FCTL_STYPE) {
2501         case IEEE80211_STYPE_BEACON:
2502                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2503                 break;
2504         case IEEE80211_STYPE_PROBE_RESP:
2505                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2506                 break;
2507         case IEEE80211_STYPE_AUTH:
2508                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2509                 break;
2510         case IEEE80211_STYPE_DEAUTH:
2511                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2512                 break;
2513         case IEEE80211_STYPE_DISASSOC:
2514                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2515                 break;
2516         case IEEE80211_STYPE_ASSOC_RESP:
2517         case IEEE80211_STYPE_REASSOC_RESP:
2518                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2519                 break;
2520         case IEEE80211_STYPE_ACTION:
2521                 switch (mgmt->u.action.category) {
2522                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2523                         ieee80211_sta_process_chanswitch(sdata,
2524                                         &mgmt->u.action.u.chan_switch.sw_elem,
2525                                         (void *)ifmgd->associated->priv,
2526                                         rx_status->mactime);
2527                         break;
2528                 }
2529         }
2530         mutex_unlock(&ifmgd->mtx);
2531
2532         switch (rma) {
2533         case RX_MGMT_NONE:
2534                 /* no action */
2535                 break;
2536         case RX_MGMT_CFG80211_DEAUTH:
2537                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2538                 break;
2539         case RX_MGMT_CFG80211_DISASSOC:
2540                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2541                 break;
2542         case RX_MGMT_CFG80211_RX_AUTH:
2543                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2544                 break;
2545         case RX_MGMT_CFG80211_RX_ASSOC:
2546                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2547                 break;
2548         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2549                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2550                 break;
2551         default:
2552                 WARN(1, "unexpected: %d", rma);
2553         }
2554 }
2555
2556 static void ieee80211_sta_timer(unsigned long data)
2557 {
2558         struct ieee80211_sub_if_data *sdata =
2559                 (struct ieee80211_sub_if_data *) data;
2560         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2561         struct ieee80211_local *local = sdata->local;
2562
2563         if (local->quiescing) {
2564                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2565                 return;
2566         }
2567
2568         ieee80211_queue_work(&local->hw, &sdata->work);
2569 }
2570
2571 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2572                                           u8 *bssid, u8 reason)
2573 {
2574         struct ieee80211_local *local = sdata->local;
2575         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2576         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2577
2578         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2579                           IEEE80211_STA_BEACON_POLL);
2580
2581         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2582                                false, frame_buf);
2583         mutex_unlock(&ifmgd->mtx);
2584
2585         /*
2586          * must be outside lock due to cfg80211,
2587          * but that's not a problem.
2588          */
2589         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2590
2591         mutex_lock(&local->mtx);
2592         ieee80211_recalc_idle(local);
2593         mutex_unlock(&local->mtx);
2594
2595         mutex_lock(&ifmgd->mtx);
2596 }
2597
2598 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2599 {
2600         struct ieee80211_local *local = sdata->local;
2601         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2602         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2603
2604         lockdep_assert_held(&ifmgd->mtx);
2605
2606         if (WARN_ON_ONCE(!auth_data))
2607                 return -EINVAL;
2608
2609         auth_data->tries++;
2610
2611         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2612                 printk(KERN_DEBUG "%s: authentication with %pM timed out\n",
2613                        sdata->name, auth_data->bss->bssid);
2614
2615                 /*
2616                  * Most likely AP is not in the range so remove the
2617                  * bss struct for that AP.
2618                  */
2619                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2620
2621                 return -ETIMEDOUT;
2622         }
2623
2624         if (auth_data->bss->proberesp_ies) {
2625                 printk(KERN_DEBUG "%s: send auth to %pM (try %d/%d)\n",
2626                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2627                        IEEE80211_AUTH_MAX_TRIES);
2628
2629                 auth_data->expected_transaction = 2;
2630                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2631                                     auth_data->ie, auth_data->ie_len,
2632                                     auth_data->bss->bssid,
2633                                     auth_data->bss->bssid, NULL, 0, 0);
2634         } else {
2635                 const u8 *ssidie;
2636
2637                 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
2638                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2639                        IEEE80211_AUTH_MAX_TRIES);
2640
2641                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2642                 if (!ssidie)
2643                         return -EINVAL;
2644                 /*
2645                  * Direct probe is sent to broadcast address as some APs
2646                  * will not answer to direct packet in unassociated state.
2647                  */
2648                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2649                                          NULL, 0, (u32) -1, true, false);
2650         }
2651
2652         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2653         run_again(ifmgd, auth_data->timeout);
2654
2655         return 0;
2656 }
2657
2658 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2659 {
2660         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2661         struct ieee80211_local *local = sdata->local;
2662
2663         lockdep_assert_held(&sdata->u.mgd.mtx);
2664
2665         assoc_data->tries++;
2666         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2667                 printk(KERN_DEBUG "%s: association with %pM timed out\n",
2668                        sdata->name, assoc_data->bss->bssid);
2669
2670                 /*
2671                  * Most likely AP is not in the range so remove the
2672                  * bss struct for that AP.
2673                  */
2674                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2675
2676                 return -ETIMEDOUT;
2677         }
2678
2679         printk(KERN_DEBUG "%s: associate with %pM (try %d/%d)\n",
2680                sdata->name, assoc_data->bss->bssid, assoc_data->tries,
2681                IEEE80211_ASSOC_MAX_TRIES);
2682         ieee80211_send_assoc(sdata);
2683
2684         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2685         run_again(&sdata->u.mgd, assoc_data->timeout);
2686
2687         return 0;
2688 }
2689
2690 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2691 {
2692         struct ieee80211_local *local = sdata->local;
2693         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2694
2695         mutex_lock(&ifmgd->mtx);
2696
2697         if (ifmgd->auth_data &&
2698             time_after(jiffies, ifmgd->auth_data->timeout)) {
2699                 if (ifmgd->auth_data->done) {
2700                         /*
2701                          * ok ... we waited for assoc but userspace didn't,
2702                          * so let's just kill the auth data
2703                          */
2704                         ieee80211_destroy_auth_data(sdata, false);
2705                 } else if (ieee80211_probe_auth(sdata)) {
2706                         u8 bssid[ETH_ALEN];
2707
2708                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2709
2710                         ieee80211_destroy_auth_data(sdata, false);
2711
2712                         mutex_unlock(&ifmgd->mtx);
2713                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2714                         mutex_lock(&ifmgd->mtx);
2715                 }
2716         } else if (ifmgd->auth_data)
2717                 run_again(ifmgd, ifmgd->auth_data->timeout);
2718
2719         if (ifmgd->assoc_data &&
2720             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2721                 if (!ifmgd->assoc_data->have_beacon ||
2722                     ieee80211_do_assoc(sdata)) {
2723                         u8 bssid[ETH_ALEN];
2724
2725                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2726
2727                         ieee80211_destroy_assoc_data(sdata, false);
2728
2729                         mutex_unlock(&ifmgd->mtx);
2730                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2731                         mutex_lock(&ifmgd->mtx);
2732                 }
2733         } else if (ifmgd->assoc_data)
2734                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2735
2736         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2737                             IEEE80211_STA_CONNECTION_POLL) &&
2738             ifmgd->associated) {
2739                 u8 bssid[ETH_ALEN];
2740                 int max_tries;
2741
2742                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2743
2744                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2745                         max_tries = max_nullfunc_tries;
2746                 else
2747                         max_tries = max_probe_tries;
2748
2749                 /* ACK received for nullfunc probing frame */
2750                 if (!ifmgd->probe_send_count)
2751                         ieee80211_reset_ap_probe(sdata);
2752                 else if (ifmgd->nullfunc_failed) {
2753                         if (ifmgd->probe_send_count < max_tries) {
2754 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2755                                 wiphy_debug(local->hw.wiphy,
2756                                             "%s: No ack for nullfunc frame to"
2757                                             " AP %pM, try %d/%i\n",
2758                                             sdata->name, bssid,
2759                                             ifmgd->probe_send_count, max_tries);
2760 #endif
2761                                 ieee80211_mgd_probe_ap_send(sdata);
2762                         } else {
2763 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2764                                 wiphy_debug(local->hw.wiphy,
2765                                             "%s: No ack for nullfunc frame to"
2766                                             " AP %pM, disconnecting.\n",
2767                                             sdata->name, bssid);
2768 #endif
2769                                 ieee80211_sta_connection_lost(sdata, bssid,
2770                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2771                         }
2772                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2773                         run_again(ifmgd, ifmgd->probe_timeout);
2774                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2775 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2776                         wiphy_debug(local->hw.wiphy,
2777                                     "%s: Failed to send nullfunc to AP %pM"
2778                                     " after %dms, disconnecting.\n",
2779                                     sdata->name,
2780                                     bssid, probe_wait_ms);
2781 #endif
2782                         ieee80211_sta_connection_lost(sdata, bssid,
2783                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2784                 } else if (ifmgd->probe_send_count < max_tries) {
2785 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2786                         wiphy_debug(local->hw.wiphy,
2787                                     "%s: No probe response from AP %pM"
2788                                     " after %dms, try %d/%i\n",
2789                                     sdata->name,
2790                                     bssid, probe_wait_ms,
2791                                     ifmgd->probe_send_count, max_tries);
2792 #endif
2793                         ieee80211_mgd_probe_ap_send(sdata);
2794                 } else {
2795                         /*
2796                          * We actually lost the connection ... or did we?
2797                          * Let's make sure!
2798                          */
2799                         wiphy_debug(local->hw.wiphy,
2800                                     "%s: No probe response from AP %pM"
2801                                     " after %dms, disconnecting.\n",
2802                                     sdata->name,
2803                                     bssid, probe_wait_ms);
2804
2805                         ieee80211_sta_connection_lost(sdata, bssid,
2806                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2807                 }
2808         }
2809
2810         mutex_unlock(&ifmgd->mtx);
2811
2812         mutex_lock(&local->mtx);
2813         ieee80211_recalc_idle(local);
2814         mutex_unlock(&local->mtx);
2815 }
2816
2817 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2818 {
2819         struct ieee80211_sub_if_data *sdata =
2820                 (struct ieee80211_sub_if_data *) data;
2821         struct ieee80211_local *local = sdata->local;
2822
2823         if (local->quiescing)
2824                 return;
2825
2826         ieee80211_queue_work(&sdata->local->hw,
2827                              &sdata->u.mgd.beacon_connection_loss_work);
2828 }
2829
2830 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2831 {
2832         struct ieee80211_sub_if_data *sdata =
2833                 (struct ieee80211_sub_if_data *) data;
2834         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2835         struct ieee80211_local *local = sdata->local;
2836
2837         if (local->quiescing)
2838                 return;
2839
2840         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2841 }
2842
2843 static void ieee80211_sta_monitor_work(struct work_struct *work)
2844 {
2845         struct ieee80211_sub_if_data *sdata =
2846                 container_of(work, struct ieee80211_sub_if_data,
2847                              u.mgd.monitor_work);
2848
2849         ieee80211_mgd_probe_ap(sdata, false);
2850 }
2851
2852 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2853 {
2854         u32 flags;
2855
2856         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2857                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2858                                         IEEE80211_STA_CONNECTION_POLL);
2859
2860                 /* let's probe the connection once */
2861                 flags = sdata->local->hw.flags;
2862                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2863                         ieee80211_queue_work(&sdata->local->hw,
2864                                              &sdata->u.mgd.monitor_work);
2865                 /* and do all the other regular work too */
2866                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2867         }
2868 }
2869
2870 #ifdef CONFIG_PM
2871 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2872 {
2873         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2874
2875         /*
2876          * we need to use atomic bitops for the running bits
2877          * only because both timers might fire at the same
2878          * time -- the code here is properly synchronised.
2879          */
2880
2881         cancel_work_sync(&ifmgd->request_smps_work);
2882
2883         cancel_work_sync(&ifmgd->monitor_work);
2884         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2885         if (del_timer_sync(&ifmgd->timer))
2886                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2887
2888         cancel_work_sync(&ifmgd->chswitch_work);
2889         if (del_timer_sync(&ifmgd->chswitch_timer))
2890                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2891
2892         /* these will just be re-established on connection */
2893         del_timer_sync(&ifmgd->conn_mon_timer);
2894         del_timer_sync(&ifmgd->bcn_mon_timer);
2895 }
2896
2897 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2898 {
2899         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2900
2901         if (!ifmgd->associated)
2902                 return;
2903
2904         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2905                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2906                 mutex_lock(&ifmgd->mtx);
2907                 if (ifmgd->associated) {
2908 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2909                         wiphy_debug(sdata->local->hw.wiphy,
2910                                     "%s: driver requested disconnect after resume.\n",
2911                                     sdata->name);
2912 #endif
2913                         ieee80211_sta_connection_lost(sdata,
2914                                 ifmgd->associated->bssid,
2915                                 WLAN_REASON_UNSPECIFIED);
2916                         mutex_unlock(&ifmgd->mtx);
2917                         return;
2918                 }
2919                 mutex_unlock(&ifmgd->mtx);
2920         }
2921
2922         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2923                 add_timer(&ifmgd->timer);
2924         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2925                 add_timer(&ifmgd->chswitch_timer);
2926         ieee80211_sta_reset_beacon_monitor(sdata);
2927         ieee80211_restart_sta_timer(sdata);
2928 }
2929 #endif
2930
2931 /* interface setup */
2932 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2933 {
2934         struct ieee80211_if_managed *ifmgd;
2935
2936         ifmgd = &sdata->u.mgd;
2937         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2938         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2939         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2940                   ieee80211_beacon_connection_loss_work);
2941         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2942         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2943                     (unsigned long) sdata);
2944         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2945                     (unsigned long) sdata);
2946         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2947                     (unsigned long) sdata);
2948         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2949                     (unsigned long) sdata);
2950
2951         ifmgd->flags = 0;
2952         ifmgd->powersave = sdata->wdev.ps;
2953         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
2954         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
2955
2956         mutex_init(&ifmgd->mtx);
2957
2958         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2959                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2960         else
2961                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2962 }
2963
2964 /* scan finished notification */
2965 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2966 {
2967         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2968
2969         /* Restart STA timers */
2970         rcu_read_lock();
2971         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2972                 ieee80211_restart_sta_timer(sdata);
2973         rcu_read_unlock();
2974 }
2975
2976 int ieee80211_max_network_latency(struct notifier_block *nb,
2977                                   unsigned long data, void *dummy)
2978 {
2979         s32 latency_usec = (s32) data;
2980         struct ieee80211_local *local =
2981                 container_of(nb, struct ieee80211_local,
2982                              network_latency_notifier);
2983
2984         mutex_lock(&local->iflist_mtx);
2985         ieee80211_recalc_ps(local, latency_usec);
2986         mutex_unlock(&local->iflist_mtx);
2987
2988         return 0;
2989 }
2990
2991 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
2992                                      struct cfg80211_bss *cbss, bool assoc)
2993 {
2994         struct ieee80211_local *local = sdata->local;
2995         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2996         struct ieee80211_bss *bss = (void *)cbss->priv;
2997         struct sta_info *sta;
2998         bool have_sta = false;
2999         int err;
3000         int ht_cfreq;
3001         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3002         const u8 *ht_oper_ie;
3003         const struct ieee80211_ht_operation *ht_oper = NULL;
3004         struct ieee80211_supported_band *sband;
3005
3006         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3007                 return -EINVAL;
3008
3009         if (assoc) {
3010                 rcu_read_lock();
3011                 have_sta = sta_info_get(sdata, cbss->bssid);
3012                 rcu_read_unlock();
3013         }
3014
3015         if (!have_sta) {
3016                 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3017                 if (!sta)
3018                         return -ENOMEM;
3019         }
3020
3021         mutex_lock(&local->mtx);
3022         ieee80211_recalc_idle(sdata->local);
3023         mutex_unlock(&local->mtx);
3024
3025         /* switch to the right channel */
3026         sband = local->hw.wiphy->bands[cbss->channel->band];
3027
3028         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3029
3030         if (sband->ht_cap.ht_supported) {
3031                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3032                                               cbss->information_elements,
3033                                               cbss->len_information_elements);
3034                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3035                         ht_oper = (void *)(ht_oper_ie + 2);
3036         }
3037
3038         if (ht_oper) {
3039                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3040                                                           cbss->channel->band);
3041                 /* check that channel matches the right operating channel */
3042                 if (cbss->channel->center_freq != ht_cfreq) {
3043                         /*
3044                          * It's possible that some APs are confused here;
3045                          * Netgear WNDR3700 sometimes reports 4 higher than
3046                          * the actual channel in association responses, but
3047                          * since we look at probe response/beacon data here
3048                          * it should be OK.
3049                          */
3050                         printk(KERN_DEBUG
3051                                "%s: Wrong control channel: center-freq: %d"
3052                                " ht-cfreq: %d ht->primary_chan: %d"
3053                                " band: %d. Disabling HT.\n",
3054                                sdata->name, cbss->channel->center_freq,
3055                                ht_cfreq, ht_oper->primary_chan,
3056                                cbss->channel->band);
3057                         ht_oper = NULL;
3058                 }
3059         }
3060
3061         if (ht_oper) {
3062                 channel_type = NL80211_CHAN_HT20;
3063
3064                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3065                         switch (ht_oper->ht_param &
3066                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3067                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3068                                 channel_type = NL80211_CHAN_HT40PLUS;
3069                                 break;
3070                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3071                                 channel_type = NL80211_CHAN_HT40MINUS;
3072                                 break;
3073                         }
3074                 }
3075         }
3076
3077         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3078                 /* can only fail due to HT40+/- mismatch */
3079                 channel_type = NL80211_CHAN_HT20;
3080                 printk(KERN_DEBUG
3081                        "%s: disabling 40 MHz due to multi-vif mismatch\n",
3082                        sdata->name);
3083                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3084                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3085                                                     channel_type));
3086         }
3087
3088         local->oper_channel = cbss->channel;
3089         ieee80211_hw_config(local, 0);
3090
3091         if (!have_sta) {
3092                 u32 rates = 0, basic_rates = 0;
3093                 bool have_higher_than_11mbit;
3094                 int min_rate = INT_MAX, min_rate_index = -1;
3095
3096                 ieee80211_get_rates(sband, bss->supp_rates,
3097                                     bss->supp_rates_len,
3098                                     &rates, &basic_rates,
3099                                     &have_higher_than_11mbit,
3100                                     &min_rate, &min_rate_index);
3101
3102                 /*
3103                  * This used to be a workaround for basic rates missing
3104                  * in the association response frame. Now that we no
3105                  * longer use the basic rates from there, it probably
3106                  * doesn't happen any more, but keep the workaround so
3107                  * in case some *other* APs are buggy in different ways
3108                  * we can connect -- with a warning.
3109                  */
3110                 if (!basic_rates && min_rate_index >= 0) {
3111                         printk(KERN_DEBUG
3112                                "%s: No basic rates, using min rate instead.\n",
3113                                sdata->name);
3114                         basic_rates = BIT(min_rate_index);
3115                 }
3116
3117                 sta->sta.supp_rates[cbss->channel->band] = rates;
3118                 sdata->vif.bss_conf.basic_rates = basic_rates;
3119
3120                 /* cf. IEEE 802.11 9.2.12 */
3121                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3122                     have_higher_than_11mbit)
3123                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3124                 else
3125                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3126
3127                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3128
3129                 /* tell driver about BSSID and basic rates */
3130                 ieee80211_bss_info_change_notify(sdata,
3131                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES);
3132
3133                 if (assoc)
3134                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3135
3136                 err = sta_info_insert(sta);
3137                 sta = NULL;
3138                 if (err) {
3139                         printk(KERN_DEBUG
3140                                "%s: failed to insert STA entry for the AP (error %d)\n",
3141                                sdata->name, err);
3142                         return err;
3143                 }
3144         } else
3145                 WARN_ON_ONCE(compare_ether_addr(ifmgd->bssid, cbss->bssid));
3146
3147         return 0;
3148 }
3149
3150 /* config hooks */
3151 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3152                        struct cfg80211_auth_request *req)
3153 {
3154         struct ieee80211_local *local = sdata->local;
3155         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3156         struct ieee80211_mgd_auth_data *auth_data;
3157         u16 auth_alg;
3158         int err;
3159
3160         /* prepare auth data structure */
3161
3162         switch (req->auth_type) {
3163         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3164                 auth_alg = WLAN_AUTH_OPEN;
3165                 break;
3166         case NL80211_AUTHTYPE_SHARED_KEY:
3167                 if (IS_ERR(local->wep_tx_tfm))
3168                         return -EOPNOTSUPP;
3169                 auth_alg = WLAN_AUTH_SHARED_KEY;
3170                 break;
3171         case NL80211_AUTHTYPE_FT:
3172                 auth_alg = WLAN_AUTH_FT;
3173                 break;
3174         case NL80211_AUTHTYPE_NETWORK_EAP:
3175                 auth_alg = WLAN_AUTH_LEAP;
3176                 break;
3177         default:
3178                 return -EOPNOTSUPP;
3179         }
3180
3181         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3182         if (!auth_data)
3183                 return -ENOMEM;
3184
3185         auth_data->bss = req->bss;
3186
3187         if (req->ie && req->ie_len) {
3188                 memcpy(auth_data->ie, req->ie, req->ie_len);
3189                 auth_data->ie_len = req->ie_len;
3190         }
3191
3192         if (req->key && req->key_len) {
3193                 auth_data->key_len = req->key_len;
3194                 auth_data->key_idx = req->key_idx;
3195                 memcpy(auth_data->key, req->key, req->key_len);
3196         }
3197
3198         auth_data->algorithm = auth_alg;
3199
3200         /* try to authenticate/probe */
3201
3202         mutex_lock(&ifmgd->mtx);
3203
3204         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3205             ifmgd->assoc_data) {
3206                 err = -EBUSY;
3207                 goto err_free;
3208         }
3209
3210         if (ifmgd->auth_data)
3211                 ieee80211_destroy_auth_data(sdata, false);
3212
3213         /* prep auth_data so we don't go into idle on disassoc */
3214         ifmgd->auth_data = auth_data;
3215
3216         if (ifmgd->associated)
3217                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3218
3219         printk(KERN_DEBUG "%s: authenticate with %pM\n",
3220                sdata->name, req->bss->bssid);
3221
3222         err = ieee80211_prep_connection(sdata, req->bss, false);
3223         if (err)
3224                 goto err_clear;
3225
3226         err = ieee80211_probe_auth(sdata);
3227         if (err) {
3228                 sta_info_destroy_addr(sdata, req->bss->bssid);
3229                 goto err_clear;
3230         }
3231
3232         /* hold our own reference */
3233         cfg80211_ref_bss(auth_data->bss);
3234         err = 0;
3235         goto out_unlock;
3236
3237  err_clear:
3238         ifmgd->auth_data = NULL;
3239  err_free:
3240         kfree(auth_data);
3241  out_unlock:
3242         mutex_unlock(&ifmgd->mtx);
3243
3244         return err;
3245 }
3246
3247 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3248                         struct cfg80211_assoc_request *req)
3249 {
3250         struct ieee80211_local *local = sdata->local;
3251         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3252         struct ieee80211_bss *bss = (void *)req->bss->priv;
3253         struct ieee80211_mgd_assoc_data *assoc_data;
3254         struct ieee80211_supported_band *sband;
3255         const u8 *ssidie;
3256         int i, err;
3257
3258         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3259         if (!ssidie)
3260                 return -EINVAL;
3261
3262         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3263         if (!assoc_data)
3264                 return -ENOMEM;
3265
3266         mutex_lock(&ifmgd->mtx);
3267
3268         if (ifmgd->associated)
3269                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3270
3271         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3272                 err = -EBUSY;
3273                 goto err_free;
3274         }
3275
3276         if (ifmgd->assoc_data) {
3277                 err = -EBUSY;
3278                 goto err_free;
3279         }
3280
3281         if (ifmgd->auth_data) {
3282                 bool match;
3283
3284                 /* keep sta info, bssid if matching */
3285                 match = compare_ether_addr(ifmgd->bssid, req->bss->bssid) == 0;
3286                 ieee80211_destroy_auth_data(sdata, match);
3287         }
3288
3289         /* prepare assoc data */
3290
3291         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3292         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3293
3294         ifmgd->beacon_crc_valid = false;
3295
3296         /*
3297          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3298          * We still associate in non-HT mode (11a/b/g) if any one of these
3299          * ciphers is configured as pairwise.
3300          * We can set this to true for non-11n hardware, that'll be checked
3301          * separately along with the peer capabilities.
3302          */
3303         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
3304                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3305                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3306                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
3307                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3308
3309         if (req->flags & ASSOC_REQ_DISABLE_HT)
3310                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3311
3312         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3313         sband = local->hw.wiphy->bands[req->bss->channel->band];
3314         if (!sband->ht_cap.ht_supported ||
3315             local->hw.queues < 4 || !bss->wmm_used)
3316                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3317
3318         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3319         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3320                sizeof(ifmgd->ht_capa_mask));
3321
3322         if (req->ie && req->ie_len) {
3323                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3324                 assoc_data->ie_len = req->ie_len;
3325         }
3326
3327         assoc_data->bss = req->bss;
3328
3329         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3330                 if (ifmgd->powersave)
3331                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3332                 else
3333                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3334         } else
3335                 ifmgd->ap_smps = ifmgd->req_smps;
3336
3337         assoc_data->capability = req->bss->capability;
3338         assoc_data->wmm = bss->wmm_used && (local->hw.queues >= 4);
3339         assoc_data->supp_rates = bss->supp_rates;
3340         assoc_data->supp_rates_len = bss->supp_rates_len;
3341         assoc_data->ht_operation_ie =
3342                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3343
3344         if (bss->wmm_used && bss->uapsd_supported &&
3345             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3346                 assoc_data->uapsd = true;
3347                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3348         } else {
3349                 assoc_data->uapsd = false;
3350                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3351         }
3352
3353         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3354         assoc_data->ssid_len = ssidie[1];
3355
3356         if (req->prev_bssid)
3357                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3358
3359         if (req->use_mfp) {
3360                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3361                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3362         } else {
3363                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3364                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3365         }
3366
3367         if (req->crypto.control_port)
3368                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3369         else
3370                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3371
3372         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3373         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3374
3375         /* kick off associate process */
3376
3377         ifmgd->assoc_data = assoc_data;
3378
3379         err = ieee80211_prep_connection(sdata, req->bss, true);
3380         if (err)
3381                 goto err_clear;
3382
3383         if (!bss->dtim_period &&
3384             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3385                 /*
3386                  * Wait up to one beacon interval ...
3387                  * should this be more if we miss one?
3388                  */
3389                 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
3390                        sdata->name, ifmgd->bssid);
3391                 assoc_data->timeout = jiffies +
3392                                 TU_TO_EXP_TIME(req->bss->beacon_interval);
3393         } else {
3394                 assoc_data->have_beacon = true;
3395                 assoc_data->sent_assoc = false;
3396                 assoc_data->timeout = jiffies;
3397         }
3398         run_again(ifmgd, assoc_data->timeout);
3399
3400         if (bss->corrupt_data) {
3401                 char *corrupt_type = "data";
3402                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3403                         if (bss->corrupt_data &
3404                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3405                                 corrupt_type = "beacon and probe response";
3406                         else
3407                                 corrupt_type = "beacon";
3408                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3409                         corrupt_type = "probe response";
3410                 printk(KERN_DEBUG "%s: associating with AP with corrupt %s\n",
3411                        sdata->name, corrupt_type);
3412         }
3413
3414         err = 0;
3415         goto out;
3416  err_clear:
3417         ifmgd->assoc_data = NULL;
3418  err_free:
3419         kfree(assoc_data);
3420  out:
3421         mutex_unlock(&ifmgd->mtx);
3422
3423         return err;
3424 }
3425
3426 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3427                          struct cfg80211_deauth_request *req)
3428 {
3429         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3430         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3431
3432         mutex_lock(&ifmgd->mtx);
3433
3434         if (ifmgd->auth_data) {
3435                 ieee80211_destroy_auth_data(sdata, false);
3436                 mutex_unlock(&ifmgd->mtx);
3437                 return 0;
3438         }
3439
3440         printk(KERN_DEBUG
3441                "%s: deauthenticating from %pM by local choice (reason=%d)\n",
3442                sdata->name, req->bssid, req->reason_code);
3443
3444         if (ifmgd->associated &&
3445             compare_ether_addr(ifmgd->associated->bssid, req->bssid) == 0)
3446                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3447                                        req->reason_code, true, frame_buf);
3448         else
3449                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3450                                                IEEE80211_STYPE_DEAUTH,
3451                                                req->reason_code, true,
3452                                                frame_buf);
3453         mutex_unlock(&ifmgd->mtx);
3454
3455         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3456
3457         mutex_lock(&sdata->local->mtx);
3458         ieee80211_recalc_idle(sdata->local);
3459         mutex_unlock(&sdata->local->mtx);
3460
3461         return 0;
3462 }
3463
3464 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3465                            struct cfg80211_disassoc_request *req)
3466 {
3467         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3468         u8 bssid[ETH_ALEN];
3469         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3470
3471         mutex_lock(&ifmgd->mtx);
3472
3473         /*
3474          * cfg80211 should catch this ... but it's racy since
3475          * we can receive a disassoc frame, process it, hand it
3476          * to cfg80211 while that's in a locked section already
3477          * trying to tell us that the user wants to disconnect.
3478          */
3479         if (ifmgd->associated != req->bss) {
3480                 mutex_unlock(&ifmgd->mtx);
3481                 return -ENOLINK;
3482         }
3483
3484         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
3485                sdata->name, req->bss->bssid, req->reason_code);
3486
3487         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3488         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3489                                req->reason_code, !req->local_state_change,
3490                                frame_buf);
3491         mutex_unlock(&ifmgd->mtx);
3492
3493         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3494
3495         mutex_lock(&sdata->local->mtx);
3496         ieee80211_recalc_idle(sdata->local);
3497         mutex_unlock(&sdata->local->mtx);
3498
3499         return 0;
3500 }
3501
3502 void ieee80211_mgd_teardown(struct ieee80211_sub_if_data *sdata)
3503 {
3504         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3505
3506         mutex_lock(&ifmgd->mtx);
3507         if (ifmgd->assoc_data)
3508                 ieee80211_destroy_assoc_data(sdata, false);
3509         if (ifmgd->auth_data)
3510                 ieee80211_destroy_auth_data(sdata, false);
3511         del_timer_sync(&ifmgd->timer);
3512         mutex_unlock(&ifmgd->mtx);
3513 }
3514
3515 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3516                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3517                                gfp_t gfp)
3518 {
3519         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3520
3521         trace_api_cqm_rssi_notify(sdata, rssi_event);
3522
3523         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3524 }
3525 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
3526
3527 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
3528 {
3529         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3530         return sdata->dev->operstate;
3531 }
3532 EXPORT_SYMBOL(ieee80211_get_operstate);