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 /*
 175  * ieee80211_enable_ht should be called only after the operating band
 176  * has been determined as ht configuration depends on the hw's
 177  * HT abilities for a specific band.
 178  */
 179 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 180                                struct ieee80211_ht_info *hti,
 181                                const u8 *bssid, u16 ap_ht_cap_flags,
 182                                bool beacon_htcap_ie)
 183 {
 184         struct ieee80211_local *local = sdata->local;
 185         struct ieee80211_supported_band *sband;
 186         struct sta_info *sta;
 187         u32 changed = 0;
 188         int hti_cfreq;
 189         u16 ht_opmode;
 190         bool enable_ht = true;
 191         enum nl80211_channel_type prev_chantype;
 192         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 193
 194         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 195
 196         prev_chantype = sdata->vif.bss_conf.channel_type;
 197
 198         /* HT is not supported */
 199         if (!sband->ht_cap.ht_supported)
 200                 enable_ht = false;
 201
 202         if (enable_ht) {
 203                 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
 204                                                            sband->band);
 205                 /* check that channel matches the right operating channel */
 206                 if (local->hw.conf.channel->center_freq != hti_cfreq) {
 207                         /* Some APs mess this up, evidently.
 208                          * Netgear WNDR3700 sometimes reports 4 higher than
 209                          * the actual channel, for instance.
 210                          */
 211                         printk(KERN_DEBUG
 212                                "%s: Wrong control channel in association"
 213                                " response: configured center-freq: %d"
 214                                " hti-cfreq: %d  hti->control_chan: %d"
 215                                " band: %d.  Disabling HT.\n",
 216                                sdata->name,
 217                                local->hw.conf.channel->center_freq,
 218                                hti_cfreq, hti->control_chan,
 219                                sband->band);
 220                         enable_ht = false;
 221                 }
 222         }
 223
 224         if (enable_ht) {
 225                 channel_type = NL80211_CHAN_HT20;
 226
 227                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 228                     !ieee80111_cfg_override_disables_ht40(sdata) &&
 229                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 230                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 231                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 232                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 233                                 if (!(local->hw.conf.channel->flags &
 234                                     IEEE80211_CHAN_NO_HT40PLUS))
 235                                         channel_type = NL80211_CHAN_HT40PLUS;
 236                                 break;
 237                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 238                                 if (!(local->hw.conf.channel->flags &
 239                                     IEEE80211_CHAN_NO_HT40MINUS))
 240                                         channel_type = NL80211_CHAN_HT40MINUS;
 241                                 break;
 242                         }
 243                 }
 244         }
 245
 246         if (local->tmp_channel)
 247                 local->tmp_channel_type = channel_type;
 248
 249         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 250                 /* can only fail due to HT40+/- mismatch */
 251                 channel_type = NL80211_CHAN_HT20;
 252                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 253         }
 254
 255         if (beacon_htcap_ie && (prev_chantype != channel_type)) {
 256                 /*
 257                  * Whenever the AP announces the HT mode change that can be
 258                  * 40MHz intolerant or etc., it would be safer to stop tx
 259                  * queues before doing hw config to avoid buffer overflow.
 260                  */
 261                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 262                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
 263
 264                 /* flush out all packets */
 265                 synchronize_net();
 266
 267                 drv_flush(local, false);
 268         }
 269
 270         /* channel_type change automatically detected */
 271         ieee80211_hw_config(local, 0);
 272
 273         if (prev_chantype != channel_type) {
 274                 rcu_read_lock();
 275                 sta = sta_info_get(sdata, bssid);
 276                 if (sta)
 277                         rate_control_rate_update(local, sband, sta,
 278                                                  IEEE80211_RC_HT_CHANGED,
 279                                                  channel_type);
 280                 rcu_read_unlock();
 281
 282                 if (beacon_htcap_ie)
 283                         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 284                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
 285         }
 286
 287         ht_opmode = le16_to_cpu(hti->operation_mode);
 288
 289         /* if bss configuration changed store the new one */
 290         if (sdata->ht_opmode_valid != enable_ht ||
 291             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 292             prev_chantype != channel_type) {
 293                 changed |= BSS_CHANGED_HT;
 294                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 295                 sdata->ht_opmode_valid = enable_ht;
 296         }
 297
 298         return changed;
 299 }
 300
 301 /* frame sending functions */
 302
 303 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 304                                       struct ieee80211_supported_band *sband,
 305                                       u32 *rates)
 306 {
 307         int i, j, count;
 308         *rates = 0;
 309         count = 0;
 310         for (i = 0; i < supp_rates_len; i++) {
 311                 int rate = (supp_rates[i] & 0x7F) * 5;
 312
 313                 for (j = 0; j < sband->n_bitrates; j++)
 314                         if (sband->bitrates[j].bitrate == rate) {
 315                                 *rates |= BIT(j);
 316                                 count++;
 317                                 break;
 318                         }
 319         }
 320
 321         return count;
 322 }
 323
 324 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 325                                 struct sk_buff *skb, const u8 *ht_info_ie,
 326                                 struct ieee80211_supported_band *sband,
 327                                 struct ieee80211_channel *channel,
 328                                 enum ieee80211_smps_mode smps)
 329 {
 330         struct ieee80211_ht_info *ht_info;
 331         u8 *pos;
 332         u32 flags = channel->flags;
 333         u16 cap;
 334         struct ieee80211_sta_ht_cap ht_cap;
 335
 336         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 337
 338         if (!sband->ht_cap.ht_supported)
 339                 return;
 340
 341         if (!ht_info_ie)
 342                 return;
 343
 344         if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
 345                 return;
 346
 347         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 348         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 349
 350         ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
 351
 352         /* determine capability flags */
 353         cap = ht_cap.cap;
 354
 355         switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 356         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 357                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 358                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 359                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 360                 }
 361                 break;
 362         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 363                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 364                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 365                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 366                 }
 367                 break;
 368         }
 369
 370         /* set SM PS mode properly */
 371         cap &= ~IEEE80211_HT_CAP_SM_PS;
 372         switch (smps) {
 373         case IEEE80211_SMPS_AUTOMATIC:
 374         case IEEE80211_SMPS_NUM_MODES:
 375                 WARN_ON(1);
 376         case IEEE80211_SMPS_OFF:
 377                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 378                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 379                 break;
 380         case IEEE80211_SMPS_STATIC:
 381                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 382                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 383                 break;
 384         case IEEE80211_SMPS_DYNAMIC:
 385                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 386                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 387                 break;
 388         }
 389
 390         /* reserve and fill IE */
 391         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 392         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 393 }
 394
 395 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 396 {
 397         struct ieee80211_local *local = sdata->local;
 398         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 399         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 400         struct sk_buff *skb;
 401         struct ieee80211_mgmt *mgmt;
 402         u8 *pos, qos_info;
 403         size_t offset = 0, noffset;
 404         int i, count, rates_len, supp_rates_len;
 405         u16 capab;
 406         struct ieee80211_supported_band *sband;
 407         u32 rates = 0;
 408         struct ieee80211_bss *bss = (void *)assoc_data->bss->priv;
 409
 410         lockdep_assert_held(&ifmgd->mtx);
 411
 412         sband = local->hw.wiphy->bands[local->oper_channel->band];
 413
 414         if (assoc_data->supp_rates_len) {
 415                 /*
 416                  * Get all rates supported by the device and the AP as
 417                  * some APs don't like getting a superset of their rates
 418                  * in the association request (e.g. D-Link DAP 1353 in
 419                  * b-only mode)...
 420                  */
 421                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 422                                                        assoc_data->supp_rates_len,
 423                                                        sband, &rates);
 424         } else {
 425                 /*
 426                  * In case AP not provide any supported rates information
 427                  * before association, we send information element(s) with
 428                  * all rates that we support.
 429                  */
 430                 rates = ~0;
 431                 rates_len = sband->n_bitrates;
 432         }
 433
 434         skb = alloc_skb(local->hw.extra_tx_headroom +
 435                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 436                         2 + assoc_data->ssid_len + /* SSID */
 437                         4 + rates_len + /* (extended) rates */
 438                         4 + /* power capability */
 439                         2 + 2 * sband->n_channels + /* supported channels */
 440                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 441                         assoc_data->ie_len + /* extra IEs */
 442                         9, /* WMM */
 443                         GFP_KERNEL);
 444         if (!skb)
 445                 return;
 446
 447         skb_reserve(skb, local->hw.extra_tx_headroom);
 448
 449         capab = WLAN_CAPABILITY_ESS;
 450
 451         if (sband->band == IEEE80211_BAND_2GHZ) {
 452                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 453                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 454                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 455                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 456         }
 457
 458         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 459                 capab |= WLAN_CAPABILITY_PRIVACY;
 460
 461         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 462             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 463                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 464
 465         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 466         memset(mgmt, 0, 24);
 467         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 468         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 469         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 470
 471         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 472                 skb_put(skb, 10);
 473                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 474                                                   IEEE80211_STYPE_REASSOC_REQ);
 475                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 476                 mgmt->u.reassoc_req.listen_interval =
 477                                 cpu_to_le16(local->hw.conf.listen_interval);
 478                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 479                        ETH_ALEN);
 480         } else {
 481                 skb_put(skb, 4);
 482                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 483                                                   IEEE80211_STYPE_ASSOC_REQ);
 484                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 485                 mgmt->u.assoc_req.listen_interval =
 486                                 cpu_to_le16(local->hw.conf.listen_interval);
 487         }
 488
 489         /* SSID */
 490         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 491         *pos++ = WLAN_EID_SSID;
 492         *pos++ = assoc_data->ssid_len;
 493         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 494
 495         /* add all rates which were marked to be used above */
 496         supp_rates_len = rates_len;
 497         if (supp_rates_len > 8)
 498                 supp_rates_len = 8;
 499
 500         pos = skb_put(skb, supp_rates_len + 2);
 501         *pos++ = WLAN_EID_SUPP_RATES;
 502         *pos++ = supp_rates_len;
 503
 504         count = 0;
 505         for (i = 0; i < sband->n_bitrates; i++) {
 506                 if (BIT(i) & rates) {
 507                         int rate = sband->bitrates[i].bitrate;
 508                         *pos++ = (u8) (rate / 5);
 509                         if (++count == 8)
 510                                 break;
 511                 }
 512         }
 513
 514         if (rates_len > count) {
 515                 pos = skb_put(skb, rates_len - count + 2);
 516                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 517                 *pos++ = rates_len - count;
 518
 519                 for (i++; i < sband->n_bitrates; i++) {
 520                         if (BIT(i) & rates) {
 521                                 int rate = sband->bitrates[i].bitrate;
 522                                 *pos++ = (u8) (rate / 5);
 523                         }
 524                 }
 525         }
 526
 527         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 528                 /* 1. power capabilities */
 529                 pos = skb_put(skb, 4);
 530                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 531                 *pos++ = 2;
 532                 *pos++ = 0; /* min tx power */
 533                 *pos++ = local->oper_channel->max_power; /* max tx power */
 534
 535                 /* 2. supported channels */
 536                 /* TODO: get this in reg domain format */
 537                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 538                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 539                 *pos++ = 2 * sband->n_channels;
 540                 for (i = 0; i < sband->n_channels; i++) {
 541                         *pos++ = ieee80211_frequency_to_channel(
 542                                         sband->channels[i].center_freq);
 543                         *pos++ = 1; /* one channel in the subband*/
 544                 }
 545         }
 546
 547         /* if present, add any custom IEs that go before HT */
 548         if (assoc_data->ie_len && assoc_data->ie) {
 549                 static const u8 before_ht[] = {
 550                         WLAN_EID_SSID,
 551                         WLAN_EID_SUPP_RATES,
 552                         WLAN_EID_EXT_SUPP_RATES,
 553                         WLAN_EID_PWR_CAPABILITY,
 554                         WLAN_EID_SUPPORTED_CHANNELS,
 555                         WLAN_EID_RSN,
 556                         WLAN_EID_QOS_CAPA,
 557                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 558                         WLAN_EID_MOBILITY_DOMAIN,
 559                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 560                 };
 561                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 562                                              before_ht, ARRAY_SIZE(before_ht),
 563                                              offset);
 564                 pos = skb_put(skb, noffset - offset);
 565                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 566                 offset = noffset;
 567         }
 568
 569         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N) &&
 570             bss->wmm_used && local->hw.queues >= 4)
 571                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ht_information_ie,
 572                                     sband, local->oper_channel, ifmgd->ap_smps);
 573
 574         /* if present, add any custom non-vendor IEs that go after HT */
 575         if (assoc_data->ie_len && assoc_data->ie) {
 576                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 577                                                     assoc_data->ie_len,
 578                                                     offset);
 579                 pos = skb_put(skb, noffset - offset);
 580                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 581                 offset = noffset;
 582         }
 583
 584         if (assoc_data->wmm_used && local->hw.queues >= 4) {
 585                 if (assoc_data->uapsd_used) {
 586                         qos_info = local->uapsd_queues;
 587                         qos_info |= (local->uapsd_max_sp_len <<
 588                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 589                 } else {
 590                         qos_info = 0;
 591                 }
 592
 593                 pos = skb_put(skb, 9);
 594                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 595                 *pos++ = 7; /* len */
 596                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 597                 *pos++ = 0x50;
 598                 *pos++ = 0xf2;
 599                 *pos++ = 2; /* WME */
 600                 *pos++ = 0; /* WME info */
 601                 *pos++ = 1; /* WME ver */
 602                 *pos++ = qos_info;
 603         }
 604
 605         /* add any remaining custom (i.e. vendor specific here) IEs */
 606         if (assoc_data->ie_len && assoc_data->ie) {
 607                 noffset = assoc_data->ie_len;
 608                 pos = skb_put(skb, noffset - offset);
 609                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 610         }
 611
 612         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 613         ieee80211_tx_skb(sdata, skb);
 614 }
 615
 616 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 617                                            const u8 *bssid, u16 stype,
 618                                            u16 reason, bool send_frame,
 619                                            u8 *frame_buf)
 620 {
 621         struct ieee80211_local *local = sdata->local;
 622         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 623         struct sk_buff *skb;
 624         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 625
 626         /* build frame */
 627         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 628         mgmt->duration = 0; /* initialize only */
 629         mgmt->seq_ctrl = 0; /* initialize only */
 630         memcpy(mgmt->da, bssid, ETH_ALEN);
 631         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 632         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 633         /* u.deauth.reason_code == u.disassoc.reason_code */
 634         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 635
 636         if (send_frame) {
 637                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 638                                     DEAUTH_DISASSOC_LEN);
 639                 if (!skb)
 640                         return;
 641
 642                 skb_reserve(skb, local->hw.extra_tx_headroom);
 643
 644                 /* copy in frame */
 645                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 646                        mgmt, DEAUTH_DISASSOC_LEN);
 647
 648                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 649                         IEEE80211_SKB_CB(skb)->flags |=
 650                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
 651                 ieee80211_tx_skb(sdata, skb);
 652         }
 653 }
 654
 655 void ieee80211_send_pspoll(struct ieee80211_local *local,
 656                            struct ieee80211_sub_if_data *sdata)
 657 {
 658         struct ieee80211_pspoll *pspoll;
 659         struct sk_buff *skb;
 660
 661         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 662         if (!skb)
 663                 return;
 664
 665         pspoll = (struct ieee80211_pspoll *) skb->data;
 666         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 667
 668         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 669         ieee80211_tx_skb(sdata, skb);
 670 }
 671
 672 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 673                              struct ieee80211_sub_if_data *sdata,
 674                              int powersave)
 675 {
 676         struct sk_buff *skb;
 677         struct ieee80211_hdr_3addr *nullfunc;
 678         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 679
 680         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 681         if (!skb)
 682                 return;
 683
 684         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 685         if (powersave)
 686                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 687
 688         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 689         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 690                             IEEE80211_STA_CONNECTION_POLL))
 691                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 692
 693         ieee80211_tx_skb(sdata, skb);
 694 }
 695
 696 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 697                                           struct ieee80211_sub_if_data *sdata)
 698 {
 699         struct sk_buff *skb;
 700         struct ieee80211_hdr *nullfunc;
 701         __le16 fc;
 702
 703         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 704                 return;
 705
 706         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 707         if (!skb)
 708                 return;
 709
 710         skb_reserve(skb, local->hw.extra_tx_headroom);
 711
 712         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 713         memset(nullfunc, 0, 30);
 714         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 715                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 716         nullfunc->frame_control = fc;
 717         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 718         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 719         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 720         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 721
 722         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 723         ieee80211_tx_skb(sdata, skb);
 724 }
 725
 726 /* spectrum management related things */
 727 static void ieee80211_chswitch_work(struct work_struct *work)
 728 {
 729         struct ieee80211_sub_if_data *sdata =
 730                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 731         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 732
 733         if (!ieee80211_sdata_running(sdata))
 734                 return;
 735
 736         mutex_lock(&ifmgd->mtx);
 737         if (!ifmgd->associated)
 738                 goto out;
 739
 740         sdata->local->oper_channel = sdata->local->csa_channel;
 741         if (!sdata->local->ops->channel_switch) {
 742                 /* call "hw_config" only if doing sw channel switch */
 743                 ieee80211_hw_config(sdata->local,
 744                         IEEE80211_CONF_CHANGE_CHANNEL);
 745         } else {
 746                 /* update the device channel directly */
 747                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 748         }
 749
 750         /* XXX: shouldn't really modify cfg80211-owned data! */
 751         ifmgd->associated->channel = sdata->local->oper_channel;
 752
 753         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 754                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 755  out:
 756         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 757         mutex_unlock(&ifmgd->mtx);
 758 }
 759
 760 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 761 {
 762         struct ieee80211_sub_if_data *sdata;
 763         struct ieee80211_if_managed *ifmgd;
 764
 765         sdata = vif_to_sdata(vif);
 766         ifmgd = &sdata->u.mgd;
 767
 768         trace_api_chswitch_done(sdata, success);
 769         if (!success) {
 770                 /*
 771                  * If the channel switch was not successful, stay
 772                  * around on the old channel. We currently lack
 773                  * good handling of this situation, possibly we
 774                  * should just drop the association.
 775                  */
 776                 sdata->local->csa_channel = sdata->local->oper_channel;
 777         }
 778
 779         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 780 }
 781 EXPORT_SYMBOL(ieee80211_chswitch_done);
 782
 783 static void ieee80211_chswitch_timer(unsigned long data)
 784 {
 785         struct ieee80211_sub_if_data *sdata =
 786                 (struct ieee80211_sub_if_data *) data;
 787         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 788
 789         if (sdata->local->quiescing) {
 790                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 791                 return;
 792         }
 793
 794         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 795 }
 796
 797 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 798                                       struct ieee80211_channel_sw_ie *sw_elem,
 799                                       struct ieee80211_bss *bss,
 800                                       u64 timestamp)
 801 {
 802         struct cfg80211_bss *cbss =
 803                 container_of((void *)bss, struct cfg80211_bss, priv);
 804         struct ieee80211_channel *new_ch;
 805         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 806         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 807                                                       cbss->channel->band);
 808
 809         ASSERT_MGD_MTX(ifmgd);
 810
 811         if (!ifmgd->associated)
 812                 return;
 813
 814         if (sdata->local->scanning)
 815                 return;
 816
 817         /* Disregard subsequent beacons if we are already running a timer
 818            processing a CSA */
 819
 820         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 821                 return;
 822
 823         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 824         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 825                 return;
 826
 827         sdata->local->csa_channel = new_ch;
 828
 829         if (sdata->local->ops->channel_switch) {
 830                 /* use driver's channel switch callback */
 831                 struct ieee80211_channel_switch ch_switch;
 832                 memset(&ch_switch, 0, sizeof(ch_switch));
 833                 ch_switch.timestamp = timestamp;
 834                 if (sw_elem->mode) {
 835                         ch_switch.block_tx = true;
 836                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 837                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 838                 }
 839                 ch_switch.channel = new_ch;
 840                 ch_switch.count = sw_elem->count;
 841                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 842                 drv_channel_switch(sdata->local, &ch_switch);
 843                 return;
 844         }
 845
 846         /* channel switch handled in software */
 847         if (sw_elem->count <= 1) {
 848                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 849         } else {
 850                 if (sw_elem->mode)
 851                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 852                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 853                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 854                 mod_timer(&ifmgd->chswitch_timer,
 855                           jiffies +
 856                           msecs_to_jiffies(sw_elem->count *
 857                                            cbss->beacon_interval));
 858         }
 859 }
 860
 861 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 862                                         u16 capab_info, u8 *pwr_constr_elem,
 863                                         u8 pwr_constr_elem_len)
 864 {
 865         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 866
 867         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 868                 return;
 869
 870         /* Power constraint IE length should be 1 octet */
 871         if (pwr_constr_elem_len != 1)
 872                 return;
 873
 874         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 875             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 876                 sdata->local->power_constr_level = *pwr_constr_elem;
 877                 ieee80211_hw_config(sdata->local, 0);
 878         }
 879 }
 880
 881 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 882 {
 883         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 884         struct ieee80211_local *local = sdata->local;
 885         struct ieee80211_conf *conf = &local->hw.conf;
 886
 887         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 888                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 889                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 890
 891         local->disable_dynamic_ps = false;
 892         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 893 }
 894 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 895
 896 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 897 {
 898         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 899         struct ieee80211_local *local = sdata->local;
 900         struct ieee80211_conf *conf = &local->hw.conf;
 901
 902         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 903                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 904                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 905
 906         local->disable_dynamic_ps = true;
 907         conf->dynamic_ps_timeout = 0;
 908         del_timer_sync(&local->dynamic_ps_timer);
 909         ieee80211_queue_work(&local->hw,
 910                              &local->dynamic_ps_enable_work);
 911 }
 912 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 913
 914 /* powersave */
 915 static void ieee80211_enable_ps(struct ieee80211_local *local,
 916                                 struct ieee80211_sub_if_data *sdata)
 917 {
 918         struct ieee80211_conf *conf = &local->hw.conf;
 919
 920         /*
 921          * If we are scanning right now then the parameters will
 922          * take effect when scan finishes.
 923          */
 924         if (local->scanning)
 925                 return;
 926
 927         if (conf->dynamic_ps_timeout > 0 &&
 928             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 929                 mod_timer(&local->dynamic_ps_timer, jiffies +
 930                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 931         } else {
 932                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 933                         ieee80211_send_nullfunc(local, sdata, 1);
 934
 935                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 936                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 937                         return;
 938
 939                 conf->flags |= IEEE80211_CONF_PS;
 940                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 941         }
 942 }
 943
 944 static void ieee80211_change_ps(struct ieee80211_local *local)
 945 {
 946         struct ieee80211_conf *conf = &local->hw.conf;
 947
 948         if (local->ps_sdata) {
 949                 ieee80211_enable_ps(local, local->ps_sdata);
 950         } else if (conf->flags & IEEE80211_CONF_PS) {
 951                 conf->flags &= ~IEEE80211_CONF_PS;
 952                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 953                 del_timer_sync(&local->dynamic_ps_timer);
 954                 cancel_work_sync(&local->dynamic_ps_enable_work);
 955         }
 956 }
 957
 958 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 959 {
 960         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 961         struct sta_info *sta = NULL;
 962         bool authorized = false;
 963
 964         if (!mgd->powersave)
 965                 return false;
 966
 967         if (mgd->broken_ap)
 968                 return false;
 969
 970         if (!mgd->associated)
 971                 return false;
 972
 973         if (!mgd->associated->beacon_ies)
 974                 return false;
 975
 976         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 977                           IEEE80211_STA_CONNECTION_POLL))
 978                 return false;
 979
 980         rcu_read_lock();
 981         sta = sta_info_get(sdata, mgd->bssid);
 982         if (sta)
 983                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 984         rcu_read_unlock();
 985
 986         return authorized;
 987 }
 988
 989 /* need to hold RTNL or interface lock */
 990 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 991 {
 992         struct ieee80211_sub_if_data *sdata, *found = NULL;
 993         int count = 0;
 994         int timeout;
 995
 996         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 997                 local->ps_sdata = NULL;
 998                 return;
 999         }
1000
1001         if (!list_empty(&local->work_list)) {
1002                 local->ps_sdata = NULL;
1003                 goto change;
1004         }
1005
1006         list_for_each_entry(sdata, &local->interfaces, list) {
1007                 if (!ieee80211_sdata_running(sdata))
1008                         continue;
1009                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1010                         /* If an AP vif is found, then disable PS
1011                          * by setting the count to zero thereby setting
1012                          * ps_sdata to NULL.
1013                          */
1014                         count = 0;
1015                         break;
1016                 }
1017                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1018                         continue;
1019                 found = sdata;
1020                 count++;
1021         }
1022
1023         if (count == 1 && ieee80211_powersave_allowed(found)) {
1024                 struct ieee80211_conf *conf = &local->hw.conf;
1025                 s32 beaconint_us;
1026
1027                 if (latency < 0)
1028                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1029
1030                 beaconint_us = ieee80211_tu_to_usec(
1031                                         found->vif.bss_conf.beacon_int);
1032
1033                 timeout = local->dynamic_ps_forced_timeout;
1034                 if (timeout < 0) {
1035                         /*
1036                          * Go to full PSM if the user configures a very low
1037                          * latency requirement.
1038                          * The 2000 second value is there for compatibility
1039                          * until the PM_QOS_NETWORK_LATENCY is configured
1040                          * with real values.
1041                          */
1042                         if (latency > (1900 * USEC_PER_MSEC) &&
1043                             latency != (2000 * USEC_PER_SEC))
1044                                 timeout = 0;
1045                         else
1046                                 timeout = 100;
1047                 }
1048                 local->dynamic_ps_user_timeout = timeout;
1049                 if (!local->disable_dynamic_ps)
1050                         conf->dynamic_ps_timeout =
1051                                 local->dynamic_ps_user_timeout;
1052
1053                 if (beaconint_us > latency) {
1054                         local->ps_sdata = NULL;
1055                 } else {
1056                         struct ieee80211_bss *bss;
1057                         int maxslp = 1;
1058                         u8 dtimper;
1059
1060                         bss = (void *)found->u.mgd.associated->priv;
1061                         dtimper = bss->dtim_period;
1062
1063                         /* If the TIM IE is invalid, pretend the value is 1 */
1064                         if (!dtimper)
1065                                 dtimper = 1;
1066                         else if (dtimper > 1)
1067                                 maxslp = min_t(int, dtimper,
1068                                                     latency / beaconint_us);
1069
1070                         local->hw.conf.max_sleep_period = maxslp;
1071                         local->hw.conf.ps_dtim_period = dtimper;
1072                         local->ps_sdata = found;
1073                 }
1074         } else {
1075                 local->ps_sdata = NULL;
1076         }
1077
1078  change:
1079         ieee80211_change_ps(local);
1080 }
1081
1082 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1083 {
1084         struct ieee80211_local *local =
1085                 container_of(work, struct ieee80211_local,
1086                              dynamic_ps_disable_work);
1087
1088         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1089                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1090                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1091         }
1092
1093         ieee80211_wake_queues_by_reason(&local->hw,
1094                                         IEEE80211_QUEUE_STOP_REASON_PS);
1095 }
1096
1097 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1098 {
1099         struct ieee80211_local *local =
1100                 container_of(work, struct ieee80211_local,
1101                              dynamic_ps_enable_work);
1102         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1103         struct ieee80211_if_managed *ifmgd;
1104         unsigned long flags;
1105         int q;
1106
1107         /* can only happen when PS was just disabled anyway */
1108         if (!sdata)
1109                 return;
1110
1111         ifmgd = &sdata->u.mgd;
1112
1113         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1114                 return;
1115
1116         if (!local->disable_dynamic_ps &&
1117             local->hw.conf.dynamic_ps_timeout > 0) {
1118                 /* don't enter PS if TX frames are pending */
1119                 if (drv_tx_frames_pending(local)) {
1120                         mod_timer(&local->dynamic_ps_timer, jiffies +
1121                                   msecs_to_jiffies(
1122                                   local->hw.conf.dynamic_ps_timeout));
1123                         return;
1124                 }
1125
1126                 /*
1127                  * transmission can be stopped by others which leads to
1128                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1129                  * is not the actual idle state.
1130                  */
1131                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1132                 for (q = 0; q < local->hw.queues; q++) {
1133                         if (local->queue_stop_reasons[q]) {
1134                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1135                                                        flags);
1136                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1137                                           msecs_to_jiffies(
1138                                           local->hw.conf.dynamic_ps_timeout));
1139                                 return;
1140                         }
1141                 }
1142                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1143         }
1144
1145         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1146             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1147                 netif_tx_stop_all_queues(sdata->dev);
1148
1149                 if (drv_tx_frames_pending(local))
1150                         mod_timer(&local->dynamic_ps_timer, jiffies +
1151                                   msecs_to_jiffies(
1152                                   local->hw.conf.dynamic_ps_timeout));
1153                 else {
1154                         ieee80211_send_nullfunc(local, sdata, 1);
1155                         /* Flush to get the tx status of nullfunc frame */
1156                         drv_flush(local, false);
1157                 }
1158         }
1159
1160         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1161               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1162             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1163                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1164                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1165                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1166         }
1167
1168         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1169                 netif_tx_wake_all_queues(sdata->dev);
1170 }
1171
1172 void ieee80211_dynamic_ps_timer(unsigned long data)
1173 {
1174         struct ieee80211_local *local = (void *) data;
1175
1176         if (local->quiescing || local->suspended)
1177                 return;
1178
1179         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1180 }
1181
1182 /* MLME */
1183 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
1184                                      struct ieee80211_sub_if_data *sdata,
1185                                      u8 *wmm_param, size_t wmm_param_len)
1186 {
1187         struct ieee80211_tx_queue_params params;
1188         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1189         size_t left;
1190         int count;
1191         u8 *pos, uapsd_queues = 0;
1192
1193         if (!local->ops->conf_tx)
1194                 return;
1195
1196         if (local->hw.queues < 4)
1197                 return;
1198
1199         if (!wmm_param)
1200                 return;
1201
1202         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1203                 return;
1204
1205         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1206                 uapsd_queues = local->uapsd_queues;
1207
1208         count = wmm_param[6] & 0x0f;
1209         if (count == ifmgd->wmm_last_param_set)
1210                 return;
1211         ifmgd->wmm_last_param_set = count;
1212
1213         pos = wmm_param + 8;
1214         left = wmm_param_len - 8;
1215
1216         memset(&params, 0, sizeof(params));
1217
1218         local->wmm_acm = 0;
1219         for (; left >= 4; left -= 4, pos += 4) {
1220                 int aci = (pos[0] >> 5) & 0x03;
1221                 int acm = (pos[0] >> 4) & 0x01;
1222                 bool uapsd = false;
1223                 int queue;
1224
1225                 switch (aci) {
1226                 case 1: /* AC_BK */
1227                         queue = 3;
1228                         if (acm)
1229                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1230                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1231                                 uapsd = true;
1232                         break;
1233                 case 2: /* AC_VI */
1234                         queue = 1;
1235                         if (acm)
1236                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1237                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1238                                 uapsd = true;
1239                         break;
1240                 case 3: /* AC_VO */
1241                         queue = 0;
1242                         if (acm)
1243                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1244                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1245                                 uapsd = true;
1246                         break;
1247                 case 0: /* AC_BE */
1248                 default:
1249                         queue = 2;
1250                         if (acm)
1251                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1252                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1253                                 uapsd = true;
1254                         break;
1255                 }
1256
1257                 params.aifs = pos[0] & 0x0f;
1258                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1259                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1260                 params.txop = get_unaligned_le16(pos + 2);
1261                 params.uapsd = uapsd;
1262
1263 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1264                 wiphy_debug(local->hw.wiphy,
1265                             "WMM queue=%d aci=%d acm=%d aifs=%d "
1266                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1267                             queue, aci, acm,
1268                             params.aifs, params.cw_min, params.cw_max,
1269                             params.txop, params.uapsd);
1270 #endif
1271                 sdata->tx_conf[queue] = params;
1272                 if (drv_conf_tx(local, sdata, queue, &params))
1273                         wiphy_debug(local->hw.wiphy,
1274                                     "failed to set TX queue parameters for queue %d\n",
1275                                     queue);
1276         }
1277
1278         /* enable WMM or activate new settings */
1279         sdata->vif.bss_conf.qos = true;
1280 }
1281
1282 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1283                                            u16 capab, bool erp_valid, u8 erp)
1284 {
1285         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1286         u32 changed = 0;
1287         bool use_protection;
1288         bool use_short_preamble;
1289         bool use_short_slot;
1290
1291         if (erp_valid) {
1292                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1293                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1294         } else {
1295                 use_protection = false;
1296                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1297         }
1298
1299         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1300         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1301                 use_short_slot = true;
1302
1303         if (use_protection != bss_conf->use_cts_prot) {
1304                 bss_conf->use_cts_prot = use_protection;
1305                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1306         }
1307
1308         if (use_short_preamble != bss_conf->use_short_preamble) {
1309                 bss_conf->use_short_preamble = use_short_preamble;
1310                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1311         }
1312
1313         if (use_short_slot != bss_conf->use_short_slot) {
1314                 bss_conf->use_short_slot = use_short_slot;
1315                 changed |= BSS_CHANGED_ERP_SLOT;
1316         }
1317
1318         return changed;
1319 }
1320
1321 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1322                                      struct cfg80211_bss *cbss,
1323                                      u32 bss_info_changed)
1324 {
1325         struct ieee80211_bss *bss = (void *)cbss->priv;
1326         struct ieee80211_local *local = sdata->local;
1327         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1328
1329         bss_info_changed |= BSS_CHANGED_ASSOC;
1330         /* set timing information */
1331         bss_conf->beacon_int = cbss->beacon_interval;
1332         bss_conf->timestamp = cbss->tsf;
1333
1334         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1335         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1336                 cbss->capability, bss->has_erp_value, bss->erp_value);
1337
1338         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1339                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1340
1341         sdata->u.mgd.associated = cbss;
1342         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1343
1344         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1345
1346         /* just to be sure */
1347         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1348                                 IEEE80211_STA_BEACON_POLL);
1349
1350         ieee80211_led_assoc(local, 1);
1351
1352         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1353                 bss_conf->dtim_period = bss->dtim_period;
1354         else
1355                 bss_conf->dtim_period = 0;
1356
1357         bss_conf->assoc = 1;
1358         /*
1359          * For now just always ask the driver to update the basic rateset
1360          * when we have associated, we aren't checking whether it actually
1361          * changed or not.
1362          */
1363         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1364
1365         /* And the BSSID changed - we're associated now */
1366         bss_info_changed |= BSS_CHANGED_BSSID;
1367
1368         /* Tell the driver to monitor connection quality (if supported) */
1369         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1370             bss_conf->cqm_rssi_thold)
1371                 bss_info_changed |= BSS_CHANGED_CQM;
1372
1373         /* Enable ARP filtering */
1374         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1375                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1376                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1377         }
1378
1379         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1380
1381         mutex_lock(&local->iflist_mtx);
1382         ieee80211_recalc_ps(local, -1);
1383         ieee80211_recalc_smps(local);
1384         mutex_unlock(&local->iflist_mtx);
1385
1386         netif_tx_start_all_queues(sdata->dev);
1387         netif_carrier_on(sdata->dev);
1388 }
1389
1390 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1391                                    u16 stype, u16 reason, bool tx,
1392                                    u8 *frame_buf)
1393 {
1394         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1395         struct ieee80211_local *local = sdata->local;
1396         struct sta_info *sta;
1397         u32 changed = 0;
1398         u8 bssid[ETH_ALEN];
1399
1400         ASSERT_MGD_MTX(ifmgd);
1401
1402         if (WARN_ON_ONCE(tx && !frame_buf))
1403                 return;
1404
1405         if (WARN_ON(!ifmgd->associated))
1406                 return;
1407
1408         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1409
1410         ifmgd->associated = NULL;
1411         memset(ifmgd->bssid, 0, ETH_ALEN);
1412
1413         /*
1414          * we need to commit the associated = NULL change because the
1415          * scan code uses that to determine whether this iface should
1416          * go to/wake up from powersave or not -- and could otherwise
1417          * wake the queues erroneously.
1418          */
1419         smp_mb();
1420
1421         /*
1422          * Thus, we can only afterwards stop the queues -- to account
1423          * for the case where another CPU is finishing a scan at this
1424          * time -- we don't want the scan code to enable queues.
1425          */
1426
1427         netif_tx_stop_all_queues(sdata->dev);
1428         netif_carrier_off(sdata->dev);
1429
1430         mutex_lock(&local->sta_mtx);
1431         sta = sta_info_get(sdata, bssid);
1432         if (sta) {
1433                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1434                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1435         }
1436         mutex_unlock(&local->sta_mtx);
1437
1438         /* deauthenticate/disassociate now */
1439         if (tx || frame_buf)
1440                 ieee80211_send_deauth_disassoc(sdata, bssid, stype, reason,
1441                                                tx, frame_buf);
1442
1443         /* flush out frame */
1444         if (tx)
1445                 drv_flush(local, false);
1446
1447         /* remove AP and TDLS peers */
1448         sta_info_flush(local, sdata);
1449
1450         /* finally reset all BSS / config parameters */
1451         changed |= ieee80211_reset_erp_info(sdata);
1452
1453         ieee80211_led_assoc(local, 0);
1454         changed |= BSS_CHANGED_ASSOC;
1455         sdata->vif.bss_conf.assoc = false;
1456
1457         /* on the next assoc, re-program HT parameters */
1458         sdata->ht_opmode_valid = false;
1459         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1460         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1461
1462         local->power_constr_level = 0;
1463
1464         del_timer_sync(&local->dynamic_ps_timer);
1465         cancel_work_sync(&local->dynamic_ps_enable_work);
1466
1467         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1468                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1469                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1470         }
1471         local->ps_sdata = NULL;
1472
1473         /* Disable ARP filtering */
1474         if (sdata->vif.bss_conf.arp_filter_enabled) {
1475                 sdata->vif.bss_conf.arp_filter_enabled = false;
1476                 changed |= BSS_CHANGED_ARP_FILTER;
1477         }
1478
1479         sdata->vif.bss_conf.qos = false;
1480         changed |= BSS_CHANGED_QOS;
1481
1482         /* The BSSID (not really interesting) and HT changed */
1483         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1484         ieee80211_bss_info_change_notify(sdata, changed);
1485
1486         /* channel(_type) changes are handled by ieee80211_hw_config */
1487         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1488         ieee80211_hw_config(local, 0);
1489
1490         /* disassociated - set to defaults now */
1491         ieee80211_set_wmm_default(sdata, false);
1492
1493         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1494         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1495         del_timer_sync(&sdata->u.mgd.timer);
1496         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1497 }
1498
1499 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1500                              struct ieee80211_hdr *hdr)
1501 {
1502         /*
1503          * We can postpone the mgd.timer whenever receiving unicast frames
1504          * from AP because we know that the connection is working both ways
1505          * at that time. But multicast frames (and hence also beacons) must
1506          * be ignored here, because we need to trigger the timer during
1507          * data idle periods for sending the periodic probe request to the
1508          * AP we're connected to.
1509          */
1510         if (is_multicast_ether_addr(hdr->addr1))
1511                 return;
1512
1513         ieee80211_sta_reset_conn_monitor(sdata);
1514 }
1515
1516 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1517 {
1518         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1519
1520         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1521                               IEEE80211_STA_CONNECTION_POLL)))
1522             return;
1523
1524         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1525                           IEEE80211_STA_BEACON_POLL);
1526         mutex_lock(&sdata->local->iflist_mtx);
1527         ieee80211_recalc_ps(sdata->local, -1);
1528         mutex_unlock(&sdata->local->iflist_mtx);
1529
1530         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1531                 return;
1532
1533         /*
1534          * We've received a probe response, but are not sure whether
1535          * we have or will be receiving any beacons or data, so let's
1536          * schedule the timers again, just in case.
1537          */
1538         ieee80211_sta_reset_beacon_monitor(sdata);
1539
1540         mod_timer(&ifmgd->conn_mon_timer,
1541                   round_jiffies_up(jiffies +
1542                                    IEEE80211_CONNECTION_IDLE_TIME));
1543 }
1544
1545 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1546                              struct ieee80211_hdr *hdr, bool ack)
1547 {
1548         if (!ieee80211_is_data(hdr->frame_control))
1549             return;
1550
1551         if (ack)
1552                 ieee80211_sta_reset_conn_monitor(sdata);
1553
1554         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1555             sdata->u.mgd.probe_send_count > 0) {
1556                 if (ack)
1557                         sdata->u.mgd.probe_send_count = 0;
1558                 else
1559                         sdata->u.mgd.nullfunc_failed = true;
1560                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1561         }
1562 }
1563
1564 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1565 {
1566         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1567         const u8 *ssid;
1568         u8 *dst = ifmgd->associated->bssid;
1569         u8 unicast_limit = max(1, max_probe_tries - 3);
1570
1571         /*
1572          * Try sending broadcast probe requests for the last three
1573          * probe requests after the first ones failed since some
1574          * buggy APs only support broadcast probe requests.
1575          */
1576         if (ifmgd->probe_send_count >= unicast_limit)
1577                 dst = NULL;
1578
1579         /*
1580          * When the hardware reports an accurate Tx ACK status, it's
1581          * better to send a nullfunc frame instead of a probe request,
1582          * as it will kick us off the AP quickly if we aren't associated
1583          * anymore. The timeout will be reset if the frame is ACKed by
1584          * the AP.
1585          */
1586         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1587                 ifmgd->nullfunc_failed = false;
1588                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1589         } else {
1590                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1591                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1592                                          (u32) -1, true, false);
1593         }
1594
1595         ifmgd->probe_send_count++;
1596         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1597         run_again(ifmgd, ifmgd->probe_timeout);
1598 }
1599
1600 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1601                                    bool beacon)
1602 {
1603         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1604         bool already = false;
1605
1606         if (!ieee80211_sdata_running(sdata))
1607                 return;
1608
1609         if (sdata->local->scanning)
1610                 return;
1611
1612         if (sdata->local->tmp_channel)
1613                 return;
1614
1615         mutex_lock(&ifmgd->mtx);
1616
1617         if (!ifmgd->associated)
1618                 goto out;
1619
1620 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1621         if (beacon && net_ratelimit())
1622                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1623                        "- sending probe request\n", sdata->name);
1624 #endif
1625
1626         /*
1627          * The driver/our work has already reported this event or the
1628          * connection monitoring has kicked in and we have already sent
1629          * a probe request. Or maybe the AP died and the driver keeps
1630          * reporting until we disassociate...
1631          *
1632          * In either case we have to ignore the current call to this
1633          * function (except for setting the correct probe reason bit)
1634          * because otherwise we would reset the timer every time and
1635          * never check whether we received a probe response!
1636          */
1637         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1638                             IEEE80211_STA_CONNECTION_POLL))
1639                 already = true;
1640
1641         if (beacon)
1642                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1643         else
1644                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1645
1646         if (already)
1647                 goto out;
1648
1649         mutex_lock(&sdata->local->iflist_mtx);
1650         ieee80211_recalc_ps(sdata->local, -1);
1651         mutex_unlock(&sdata->local->iflist_mtx);
1652
1653         ifmgd->probe_send_count = 0;
1654         ieee80211_mgd_probe_ap_send(sdata);
1655  out:
1656         mutex_unlock(&ifmgd->mtx);
1657 }
1658
1659 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1660                                           struct ieee80211_vif *vif)
1661 {
1662         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1663         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1664         struct sk_buff *skb;
1665         const u8 *ssid;
1666
1667         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1668                 return NULL;
1669
1670         ASSERT_MGD_MTX(ifmgd);
1671
1672         if (!ifmgd->associated)
1673                 return NULL;
1674
1675         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1676         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1677                                         (u32) -1, ssid + 2, ssid[1],
1678                                         NULL, 0, true);
1679
1680         return skb;
1681 }
1682 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1683
1684 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1685 {
1686         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1687         struct ieee80211_local *local = sdata->local;
1688         u8 bssid[ETH_ALEN];
1689         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1690
1691         mutex_lock(&ifmgd->mtx);
1692         if (!ifmgd->associated) {
1693                 mutex_unlock(&ifmgd->mtx);
1694                 return;
1695         }
1696
1697         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1698
1699         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1700                sdata->name, bssid);
1701
1702         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1703                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1704                                false, frame_buf);
1705         mutex_unlock(&ifmgd->mtx);
1706
1707         /*
1708          * must be outside lock due to cfg80211,
1709          * but that's not a problem.
1710          */
1711         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1712
1713         mutex_lock(&local->mtx);
1714         ieee80211_recalc_idle(local);
1715         mutex_unlock(&local->mtx);
1716 }
1717
1718 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1719 {
1720         struct ieee80211_sub_if_data *sdata =
1721                 container_of(work, struct ieee80211_sub_if_data,
1722                              u.mgd.beacon_connection_loss_work);
1723         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1724         struct sta_info *sta;
1725
1726         if (ifmgd->associated) {
1727                 rcu_read_lock();
1728                 sta = sta_info_get(sdata, ifmgd->bssid);
1729                 if (sta)
1730                         sta->beacon_loss_count++;
1731                 rcu_read_unlock();
1732         }
1733
1734         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1735                 __ieee80211_connection_loss(sdata);
1736         else
1737                 ieee80211_mgd_probe_ap(sdata, true);
1738 }
1739
1740 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1741 {
1742         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1743         struct ieee80211_hw *hw = &sdata->local->hw;
1744
1745         trace_api_beacon_loss(sdata);
1746
1747         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1748         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1749 }
1750 EXPORT_SYMBOL(ieee80211_beacon_loss);
1751
1752 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1753 {
1754         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1755         struct ieee80211_hw *hw = &sdata->local->hw;
1756
1757         trace_api_connection_loss(sdata);
1758
1759         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1760         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1761 }
1762 EXPORT_SYMBOL(ieee80211_connection_loss);
1763
1764
1765 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1766                                         bool assoc)
1767 {
1768         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1769
1770         lockdep_assert_held(&sdata->u.mgd.mtx);
1771
1772         if (!assoc) {
1773                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1774
1775                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1776                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1777         }
1778
1779         cfg80211_put_bss(auth_data->bss);
1780         kfree(auth_data);
1781         sdata->u.mgd.auth_data = NULL;
1782 }
1783
1784 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1785                                      struct ieee80211_mgmt *mgmt, size_t len)
1786 {
1787         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1788         u8 *pos;
1789         struct ieee802_11_elems elems;
1790
1791         pos = mgmt->u.auth.variable;
1792         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1793         if (!elems.challenge)
1794                 return;
1795         auth_data->expected_transaction = 4;
1796         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1797                             elems.challenge - 2, elems.challenge_len + 2,
1798                             auth_data->bss->bssid, auth_data->bss->bssid,
1799                             auth_data->key, auth_data->key_len,
1800                             auth_data->key_idx);
1801 }
1802
1803 static enum rx_mgmt_action __must_check
1804 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1805                        struct ieee80211_mgmt *mgmt, size_t len)
1806 {
1807         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1808         u8 bssid[ETH_ALEN];
1809         u16 auth_alg, auth_transaction, status_code;
1810         struct sta_info *sta;
1811
1812         lockdep_assert_held(&ifmgd->mtx);
1813
1814         if (len < 24 + 6)
1815                 return RX_MGMT_NONE;
1816
1817         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1818                 return RX_MGMT_NONE;
1819
1820         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1821
1822         if (compare_ether_addr(bssid, mgmt->bssid))
1823                 return RX_MGMT_NONE;
1824
1825         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1826         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1827         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1828
1829         if (auth_alg != ifmgd->auth_data->algorithm ||
1830             auth_transaction != ifmgd->auth_data->expected_transaction)
1831                 return RX_MGMT_NONE;
1832
1833         if (status_code != WLAN_STATUS_SUCCESS) {
1834                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
1835                        sdata->name, mgmt->sa, status_code);
1836                 goto out;
1837         }
1838
1839         switch (ifmgd->auth_data->algorithm) {
1840         case WLAN_AUTH_OPEN:
1841         case WLAN_AUTH_LEAP:
1842         case WLAN_AUTH_FT:
1843                 break;
1844         case WLAN_AUTH_SHARED_KEY:
1845                 if (ifmgd->auth_data->expected_transaction != 4) {
1846                         ieee80211_auth_challenge(sdata, mgmt, len);
1847                         /* need another frame */
1848                         return RX_MGMT_NONE;
1849                 }
1850                 break;
1851         default:
1852                 WARN_ONCE(1, "invalid auth alg %d",
1853                           ifmgd->auth_data->algorithm);
1854                 return RX_MGMT_NONE;
1855         }
1856
1857         printk(KERN_DEBUG "%s: authenticated\n", sdata->name);
1858  out:
1859         ifmgd->auth_data->done = true;
1860         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1861         run_again(ifmgd, ifmgd->auth_data->timeout);
1862
1863         /* move station state to auth */
1864         mutex_lock(&sdata->local->sta_mtx);
1865         sta = sta_info_get(sdata, bssid);
1866         if (!sta) {
1867                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1868                 goto out_err;
1869         }
1870         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1871                 printk(KERN_DEBUG "%s: failed moving %pM to auth\n",
1872                        sdata->name, bssid);
1873                 goto out_err;
1874         }
1875         mutex_unlock(&sdata->local->sta_mtx);
1876
1877         return RX_MGMT_CFG80211_RX_AUTH;
1878  out_err:
1879         mutex_unlock(&sdata->local->sta_mtx);
1880         /* ignore frame -- wait for timeout */
1881         return RX_MGMT_NONE;
1882 }
1883
1884
1885 static enum rx_mgmt_action __must_check
1886 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1887                          struct ieee80211_mgmt *mgmt, size_t len)
1888 {
1889         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1890         const u8 *bssid = NULL;
1891         u16 reason_code;
1892
1893         lockdep_assert_held(&ifmgd->mtx);
1894
1895         if (len < 24 + 2)
1896                 return RX_MGMT_NONE;
1897
1898         if (!ifmgd->associated ||
1899             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
1900                 return RX_MGMT_NONE;
1901
1902         bssid = ifmgd->associated->bssid;
1903
1904         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1905
1906         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1907                         sdata->name, bssid, reason_code);
1908
1909         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1910
1911         mutex_lock(&sdata->local->mtx);
1912         ieee80211_recalc_idle(sdata->local);
1913         mutex_unlock(&sdata->local->mtx);
1914
1915         return RX_MGMT_CFG80211_DEAUTH;
1916 }
1917
1918
1919 static enum rx_mgmt_action __must_check
1920 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1921                            struct ieee80211_mgmt *mgmt, size_t len)
1922 {
1923         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1924         u16 reason_code;
1925
1926         lockdep_assert_held(&ifmgd->mtx);
1927
1928         if (len < 24 + 2)
1929                 return RX_MGMT_NONE;
1930
1931         if (!ifmgd->associated ||
1932             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
1933                 return RX_MGMT_NONE;
1934
1935         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1936
1937         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1938                         sdata->name, mgmt->sa, reason_code);
1939
1940         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1941
1942         mutex_lock(&sdata->local->mtx);
1943         ieee80211_recalc_idle(sdata->local);
1944         mutex_unlock(&sdata->local->mtx);
1945
1946         return RX_MGMT_CFG80211_DISASSOC;
1947 }
1948
1949 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1950                                 u8 *supp_rates, unsigned int supp_rates_len,
1951                                 u32 *rates, u32 *basic_rates,
1952                                 bool *have_higher_than_11mbit,
1953                                 int *min_rate, int *min_rate_index)
1954 {
1955         int i, j;
1956
1957         for (i = 0; i < supp_rates_len; i++) {
1958                 int rate = (supp_rates[i] & 0x7f) * 5;
1959                 bool is_basic = !!(supp_rates[i] & 0x80);
1960
1961                 if (rate > 110)
1962                         *have_higher_than_11mbit = true;
1963
1964                 /*
1965                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1966                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1967                  *
1968                  * Note: Even through the membership selector and the basic
1969                  *       rate flag share the same bit, they are not exactly
1970                  *       the same.
1971                  */
1972                 if (!!(supp_rates[i] & 0x80) &&
1973                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1974                         continue;
1975
1976                 for (j = 0; j < sband->n_bitrates; j++) {
1977                         if (sband->bitrates[j].bitrate == rate) {
1978                                 *rates |= BIT(j);
1979                                 if (is_basic)
1980                                         *basic_rates |= BIT(j);
1981                                 if (rate < *min_rate) {
1982                                         *min_rate = rate;
1983                                         *min_rate_index = j;
1984                                 }
1985                                 break;
1986                         }
1987                 }
1988         }
1989 }
1990
1991 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1992                                          bool assoc)
1993 {
1994         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1995
1996         lockdep_assert_held(&sdata->u.mgd.mtx);
1997
1998         if (!assoc) {
1999                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2000
2001                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2002                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2003         }
2004
2005         kfree(assoc_data);
2006         sdata->u.mgd.assoc_data = NULL;
2007 }
2008
2009 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2010                                     struct cfg80211_bss *cbss,
2011                                     struct ieee80211_mgmt *mgmt, size_t len)
2012 {
2013         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2014         struct ieee80211_local *local = sdata->local;
2015         struct ieee80211_supported_band *sband;
2016         struct sta_info *sta;
2017         u8 *pos;
2018         u32 rates, basic_rates;
2019         u16 capab_info, aid;
2020         struct ieee802_11_elems elems;
2021         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2022         u32 changed = 0;
2023         int err;
2024         bool have_higher_than_11mbit = false;
2025         u16 ap_ht_cap_flags;
2026         int min_rate = INT_MAX, min_rate_index = -1;
2027
2028         /* AssocResp and ReassocResp have identical structure */
2029
2030         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2031         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2032
2033         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2034                 printk(KERN_DEBUG
2035                        "%s: invalid AID value 0x%x; bits 15:14 not set\n",
2036                        sdata->name, aid);
2037         aid &= ~(BIT(15) | BIT(14));
2038
2039         ifmgd->broken_ap = false;
2040
2041         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2042                 printk(KERN_DEBUG
2043                        "%s: invalid AID value %d (out of range), turn off PS\n",
2044                        sdata->name, aid);
2045                 aid = 0;
2046                 ifmgd->broken_ap = true;
2047         }
2048
2049         pos = mgmt->u.assoc_resp.variable;
2050         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2051
2052         if (!elems.supp_rates) {
2053                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2054                        sdata->name);
2055                 return false;
2056         }
2057
2058         ifmgd->aid = aid;
2059
2060         mutex_lock(&sdata->local->sta_mtx);
2061         /*
2062          * station info was already allocated and inserted before
2063          * the association and should be available to us
2064          */
2065         sta = sta_info_get(sdata, cbss->bssid);
2066         if (WARN_ON(!sta)) {
2067                 mutex_unlock(&sdata->local->sta_mtx);
2068                 return false;
2069         }
2070
2071         rates = 0;
2072         basic_rates = 0;
2073         sband = local->hw.wiphy->bands[local->oper_channel->band];
2074
2075         ieee80211_get_rates(sband, elems.supp_rates, elems.supp_rates_len,
2076                             &rates, &basic_rates, &have_higher_than_11mbit,
2077                             &min_rate, &min_rate_index);
2078
2079         ieee80211_get_rates(sband, elems.ext_supp_rates,
2080                             elems.ext_supp_rates_len, &rates, &basic_rates,
2081                             &have_higher_than_11mbit,
2082                             &min_rate, &min_rate_index);
2083
2084         /*
2085          * some buggy APs don't advertise basic_rates. use the lowest
2086          * supported rate instead.
2087          */
2088         if (unlikely(!basic_rates) && min_rate_index >= 0) {
2089                 printk(KERN_DEBUG "%s: No basic rates in AssocResp. "
2090                        "Using min supported rate instead.\n", sdata->name);
2091                 basic_rates = BIT(min_rate_index);
2092         }
2093
2094         sta->sta.supp_rates[local->oper_channel->band] = rates;
2095         sdata->vif.bss_conf.basic_rates = basic_rates;
2096
2097         /* cf. IEEE 802.11 9.2.12 */
2098         if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
2099             have_higher_than_11mbit)
2100                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2101         else
2102                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2103
2104         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2105                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2106                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2107
2108         ap_ht_cap_flags = sta->sta.ht_cap.cap;
2109
2110         rate_control_rate_init(sta);
2111
2112         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2113                 set_sta_flag(sta, WLAN_STA_MFP);
2114
2115         if (elems.wmm_param)
2116                 set_sta_flag(sta, WLAN_STA_WME);
2117
2118         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2119         if (!err)
2120                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2121         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2122                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2123         if (err) {
2124                 printk(KERN_DEBUG
2125                        "%s: failed to move station %pM to desired state\n",
2126                        sdata->name, sta->sta.addr);
2127                 WARN_ON(__sta_info_destroy(sta));
2128                 mutex_unlock(&sdata->local->sta_mtx);
2129                 return false;
2130         }
2131
2132         mutex_unlock(&sdata->local->sta_mtx);
2133
2134         /*
2135          * Always handle WMM once after association regardless
2136          * of the first value the AP uses. Setting -1 here has
2137          * that effect because the AP values is an unsigned
2138          * 4-bit value.
2139          */
2140         ifmgd->wmm_last_param_set = -1;
2141
2142         if (elems.wmm_param)
2143                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2144                                          elems.wmm_param_len);
2145         else
2146                 ieee80211_set_wmm_default(sdata, false);
2147         changed |= BSS_CHANGED_QOS;
2148
2149         if (elems.ht_info_elem && elems.wmm_param &&
2150             (sdata->local->hw.queues >= 4) &&
2151             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2152                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2153                                                cbss->bssid, ap_ht_cap_flags,
2154                                                false);
2155
2156         /* set AID and assoc capability,
2157          * ieee80211_set_associated() will tell the driver */
2158         bss_conf->aid = aid;
2159         bss_conf->assoc_capability = capab_info;
2160         ieee80211_set_associated(sdata, cbss, changed);
2161
2162         /*
2163          * If we're using 4-addr mode, let the AP know that we're
2164          * doing so, so that it can create the STA VLAN on its side
2165          */
2166         if (ifmgd->use_4addr)
2167                 ieee80211_send_4addr_nullfunc(local, sdata);
2168
2169         /*
2170          * Start timer to probe the connection to the AP now.
2171          * Also start the timer that will detect beacon loss.
2172          */
2173         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2174         ieee80211_sta_reset_beacon_monitor(sdata);
2175
2176         return true;
2177 }
2178
2179 static enum rx_mgmt_action __must_check
2180 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2181                              struct ieee80211_mgmt *mgmt, size_t len,
2182                              struct cfg80211_bss **bss)
2183 {
2184         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2185         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2186         u16 capab_info, status_code, aid;
2187         struct ieee802_11_elems elems;
2188         u8 *pos;
2189         bool reassoc;
2190
2191         lockdep_assert_held(&ifmgd->mtx);
2192
2193         if (!assoc_data)
2194                 return RX_MGMT_NONE;
2195         if (compare_ether_addr(assoc_data->bss->bssid, mgmt->bssid))
2196                 return RX_MGMT_NONE;
2197
2198         /*
2199          * AssocResp and ReassocResp have identical structure, so process both
2200          * of them in this function.
2201          */
2202
2203         if (len < 24 + 6)
2204                 return RX_MGMT_NONE;
2205
2206         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2207         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2208         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2209         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2210
2211         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
2212                "status=%d aid=%d)\n",
2213                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
2214                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2215
2216         pos = mgmt->u.assoc_resp.variable;
2217         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2218
2219         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2220             elems.timeout_int && elems.timeout_int_len == 5 &&
2221             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2222                 u32 tu, ms;
2223                 tu = get_unaligned_le32(elems.timeout_int + 1);
2224                 ms = tu * 1024 / 1000;
2225                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
2226                        "comeback duration %u TU (%u ms)\n",
2227                        sdata->name, mgmt->sa, tu, ms);
2228                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2229                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2230                         run_again(ifmgd, assoc_data->timeout);
2231                 return RX_MGMT_NONE;
2232         }
2233
2234         *bss = assoc_data->bss;
2235
2236         if (status_code != WLAN_STATUS_SUCCESS) {
2237                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
2238                        sdata->name, mgmt->sa, status_code);
2239                 ieee80211_destroy_assoc_data(sdata, false);
2240         } else {
2241                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
2242
2243                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2244                         /* oops -- internal error -- send timeout for now */
2245                         ieee80211_destroy_assoc_data(sdata, true);
2246                         sta_info_destroy_addr(sdata, mgmt->bssid);
2247                         cfg80211_put_bss(*bss);
2248                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2249                 }
2250
2251                 /*
2252                  * destroy assoc_data afterwards, as otherwise an idle
2253                  * recalc after assoc_data is NULL but before associated
2254                  * is set can cause the interface to go idle
2255                  */
2256                 ieee80211_destroy_assoc_data(sdata, true);
2257         }
2258
2259         return RX_MGMT_CFG80211_RX_ASSOC;
2260 }
2261 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2262                                   struct ieee80211_mgmt *mgmt,
2263                                   size_t len,
2264                                   struct ieee80211_rx_status *rx_status,
2265                                   struct ieee802_11_elems *elems,
2266                                   bool beacon)
2267 {
2268         struct ieee80211_local *local = sdata->local;
2269         int freq;
2270         struct ieee80211_bss *bss;
2271         struct ieee80211_channel *channel;
2272         bool need_ps = false;
2273
2274         if (sdata->u.mgd.associated &&
2275             compare_ether_addr(mgmt->bssid, sdata->u.mgd.associated->bssid)
2276             == 0) {
2277                 bss = (void *)sdata->u.mgd.associated->priv;
2278                 /* not previously set so we may need to recalc */
2279                 need_ps = !bss->dtim_period;
2280         }
2281
2282         if (elems->ds_params && elems->ds_params_len == 1)
2283                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2284                                                       rx_status->band);
2285         else
2286                 freq = rx_status->freq;
2287
2288         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2289
2290         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2291                 return;
2292
2293         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2294                                         channel, beacon);
2295         if (bss)
2296                 ieee80211_rx_bss_put(local, bss);
2297
2298         if (!sdata->u.mgd.associated)
2299                 return;
2300
2301         if (need_ps) {
2302                 mutex_lock(&local->iflist_mtx);
2303                 ieee80211_recalc_ps(local, -1);
2304                 mutex_unlock(&local->iflist_mtx);
2305         }
2306
2307         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2308             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2309                                                         ETH_ALEN) == 0)) {
2310                 struct ieee80211_channel_sw_ie *sw_elem =
2311                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2312                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2313                                                  bss, rx_status->mactime);
2314         }
2315 }
2316
2317
2318 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2319                                          struct sk_buff *skb)
2320 {
2321         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2322         struct ieee80211_if_managed *ifmgd;
2323         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2324         size_t baselen, len = skb->len;
2325         struct ieee802_11_elems elems;
2326
2327         ifmgd = &sdata->u.mgd;
2328
2329         ASSERT_MGD_MTX(ifmgd);
2330
2331         if (compare_ether_addr(mgmt->da, sdata->vif.addr))
2332                 return; /* ignore ProbeResp to foreign address */
2333
2334         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2335         if (baselen > len)
2336                 return;
2337
2338         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2339                                 &elems);
2340
2341         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2342
2343         if (ifmgd->associated &&
2344             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid) == 0)
2345                 ieee80211_reset_ap_probe(sdata);
2346
2347         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2348             compare_ether_addr(mgmt->bssid, ifmgd->auth_data->bss->bssid)
2349             == 0) {
2350                 /* got probe response, continue with auth */
2351                 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
2352                 ifmgd->auth_data->tries = 0;
2353                 ifmgd->auth_data->timeout = jiffies;
2354                 run_again(ifmgd, ifmgd->auth_data->timeout);
2355         }
2356 }
2357
2358 /*
2359  * This is the canonical list of information elements we care about,
2360  * the filter code also gives us all changes to the Microsoft OUI
2361  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2362  *
2363  * We implement beacon filtering in software since that means we can
2364  * avoid processing the frame here and in cfg80211, and userspace
2365  * will not be able to tell whether the hardware supports it or not.
2366  *
2367  * XXX: This list needs to be dynamic -- userspace needs to be able to
2368  *      add items it requires. It also needs to be able to tell us to
2369  *      look out for other vendor IEs.
2370  */
2371 static const u64 care_about_ies =
2372         (1ULL << WLAN_EID_COUNTRY) |
2373         (1ULL << WLAN_EID_ERP_INFO) |
2374         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2375         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2376         (1ULL << WLAN_EID_HT_CAPABILITY) |
2377         (1ULL << WLAN_EID_HT_INFORMATION);
2378
2379 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2380                                      struct ieee80211_mgmt *mgmt,
2381                                      size_t len,
2382                                      struct ieee80211_rx_status *rx_status)
2383 {
2384         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2385         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2386         size_t baselen;
2387         struct ieee802_11_elems elems;
2388         struct ieee80211_local *local = sdata->local;
2389         u32 changed = 0;
2390         bool erp_valid, directed_tim = false;
2391         u8 erp_value = 0;
2392         u32 ncrc;
2393         u8 *bssid;
2394
2395         lockdep_assert_held(&ifmgd->mtx);
2396
2397         /* Process beacon from the current BSS */
2398         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2399         if (baselen > len)
2400                 return;
2401
2402         if (rx_status->freq != local->hw.conf.channel->center_freq)
2403                 return;
2404
2405         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2406             compare_ether_addr(mgmt->bssid, ifmgd->assoc_data->bss->bssid)
2407             == 0) {
2408                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2409                                        len - baselen, &elems);
2410
2411                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2412                                       false);
2413                 ifmgd->assoc_data->have_beacon = true;
2414                 ifmgd->assoc_data->sent_assoc = false;
2415                 /* continue assoc process */
2416                 ifmgd->assoc_data->timeout = jiffies;
2417                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2418                 return;
2419         }
2420
2421         if (!ifmgd->associated ||
2422             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
2423                 return;
2424         bssid = ifmgd->associated->bssid;
2425
2426         /* Track average RSSI from the Beacon frames of the current AP */
2427         ifmgd->last_beacon_signal = rx_status->signal;
2428         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2429                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2430                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2431                 ifmgd->last_cqm_event_signal = 0;
2432                 ifmgd->count_beacon_signal = 1;
2433                 ifmgd->last_ave_beacon_signal = 0;
2434         } else {
2435                 ifmgd->ave_beacon_signal =
2436                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2437                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2438                          ifmgd->ave_beacon_signal) / 16;
2439                 ifmgd->count_beacon_signal++;
2440         }
2441
2442         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2443             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2444                 int sig = ifmgd->ave_beacon_signal;
2445                 int last_sig = ifmgd->last_ave_beacon_signal;
2446
2447                 /*
2448                  * if signal crosses either of the boundaries, invoke callback
2449                  * with appropriate parameters
2450                  */
2451                 if (sig > ifmgd->rssi_max_thold &&
2452                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2453                         ifmgd->last_ave_beacon_signal = sig;
2454                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2455                 } else if (sig < ifmgd->rssi_min_thold &&
2456                            (last_sig >= ifmgd->rssi_max_thold ||
2457                            last_sig == 0)) {
2458                         ifmgd->last_ave_beacon_signal = sig;
2459                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2460                 }
2461         }
2462
2463         if (bss_conf->cqm_rssi_thold &&
2464             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2465             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2466                 int sig = ifmgd->ave_beacon_signal / 16;
2467                 int last_event = ifmgd->last_cqm_event_signal;
2468                 int thold = bss_conf->cqm_rssi_thold;
2469                 int hyst = bss_conf->cqm_rssi_hyst;
2470                 if (sig < thold &&
2471                     (last_event == 0 || sig < last_event - hyst)) {
2472                         ifmgd->last_cqm_event_signal = sig;
2473                         ieee80211_cqm_rssi_notify(
2474                                 &sdata->vif,
2475                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2476                                 GFP_KERNEL);
2477                 } else if (sig > thold &&
2478                            (last_event == 0 || sig > last_event + hyst)) {
2479                         ifmgd->last_cqm_event_signal = sig;
2480                         ieee80211_cqm_rssi_notify(
2481                                 &sdata->vif,
2482                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2483                                 GFP_KERNEL);
2484                 }
2485         }
2486
2487         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2488 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2489                 if (net_ratelimit()) {
2490                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
2491                                "to a received beacon\n", sdata->name);
2492                 }
2493 #endif
2494                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2495                 mutex_lock(&local->iflist_mtx);
2496                 ieee80211_recalc_ps(local, -1);
2497                 mutex_unlock(&local->iflist_mtx);
2498         }
2499
2500         /*
2501          * Push the beacon loss detection into the future since
2502          * we are processing a beacon from the AP just now.
2503          */
2504         ieee80211_sta_reset_beacon_monitor(sdata);
2505
2506         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2507         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2508                                           len - baselen, &elems,
2509                                           care_about_ies, ncrc);
2510
2511         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2512                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2513                                                    ifmgd->aid);
2514
2515         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
2516                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2517                                       true);
2518
2519                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2520                                          elems.wmm_param_len);
2521         }
2522
2523         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2524                 if (directed_tim) {
2525                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2526                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2527                                 ieee80211_hw_config(local,
2528                                                     IEEE80211_CONF_CHANGE_PS);
2529                                 ieee80211_send_nullfunc(local, sdata, 0);
2530                         } else {
2531                                 local->pspolling = true;
2532
2533                                 /*
2534                                  * Here is assumed that the driver will be
2535                                  * able to send ps-poll frame and receive a
2536                                  * response even though power save mode is
2537                                  * enabled, but some drivers might require
2538                                  * to disable power save here. This needs
2539                                  * to be investigated.
2540                                  */
2541                                 ieee80211_send_pspoll(local, sdata);
2542                         }
2543                 }
2544         }
2545
2546         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2547                 return;
2548         ifmgd->beacon_crc = ncrc;
2549         ifmgd->beacon_crc_valid = true;
2550
2551         if (elems.erp_info && elems.erp_info_len >= 1) {
2552                 erp_valid = true;
2553                 erp_value = elems.erp_info[0];
2554         } else {
2555                 erp_valid = false;
2556         }
2557         changed |= ieee80211_handle_bss_capability(sdata,
2558                         le16_to_cpu(mgmt->u.beacon.capab_info),
2559                         erp_valid, erp_value);
2560
2561
2562         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2563             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2564                 struct sta_info *sta;
2565                 struct ieee80211_supported_band *sband;
2566                 u16 ap_ht_cap_flags;
2567
2568                 rcu_read_lock();
2569
2570                 sta = sta_info_get(sdata, bssid);
2571                 if (WARN_ON(!sta)) {
2572                         rcu_read_unlock();
2573                         return;
2574                 }
2575
2576                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2577
2578                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2579                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2580
2581                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
2582
2583                 rcu_read_unlock();
2584
2585                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2586                                                bssid, ap_ht_cap_flags, true);
2587         }
2588
2589         /* Note: country IE parsing is done for us by cfg80211 */
2590         if (elems.country_elem) {
2591                 /* TODO: IBSS also needs this */
2592                 if (elems.pwr_constr_elem)
2593                         ieee80211_handle_pwr_constr(sdata,
2594                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2595                                 elems.pwr_constr_elem,
2596                                 elems.pwr_constr_elem_len);
2597         }
2598
2599         ieee80211_bss_info_change_notify(sdata, changed);
2600 }
2601
2602 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2603                                   struct sk_buff *skb)
2604 {
2605         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2606         struct ieee80211_rx_status *rx_status;
2607         struct ieee80211_mgmt *mgmt;
2608         struct cfg80211_bss *bss = NULL;
2609         enum rx_mgmt_action rma = RX_MGMT_NONE;
2610         u16 fc;
2611
2612         rx_status = (struct ieee80211_rx_status *) skb->cb;
2613         mgmt = (struct ieee80211_mgmt *) skb->data;
2614         fc = le16_to_cpu(mgmt->frame_control);
2615
2616         mutex_lock(&ifmgd->mtx);
2617
2618         switch (fc & IEEE80211_FCTL_STYPE) {
2619         case IEEE80211_STYPE_BEACON:
2620                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2621                 break;
2622         case IEEE80211_STYPE_PROBE_RESP:
2623                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2624                 break;
2625         case IEEE80211_STYPE_AUTH:
2626                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2627                 break;
2628         case IEEE80211_STYPE_DEAUTH:
2629                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2630                 break;
2631         case IEEE80211_STYPE_DISASSOC:
2632                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2633                 break;
2634         case IEEE80211_STYPE_ASSOC_RESP:
2635         case IEEE80211_STYPE_REASSOC_RESP:
2636                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2637                 break;
2638         case IEEE80211_STYPE_ACTION:
2639                 switch (mgmt->u.action.category) {
2640                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2641                         ieee80211_sta_process_chanswitch(sdata,
2642                                         &mgmt->u.action.u.chan_switch.sw_elem,
2643                                         (void *)ifmgd->associated->priv,
2644                                         rx_status->mactime);
2645                         break;
2646                 }
2647         }
2648         mutex_unlock(&ifmgd->mtx);
2649
2650         switch (rma) {
2651         case RX_MGMT_NONE:
2652                 /* no action */
2653                 break;
2654         case RX_MGMT_CFG80211_DEAUTH:
2655                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2656                 break;
2657         case RX_MGMT_CFG80211_DISASSOC:
2658                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2659                 break;
2660         case RX_MGMT_CFG80211_RX_AUTH:
2661                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2662                 break;
2663         case RX_MGMT_CFG80211_RX_ASSOC:
2664                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2665                 break;
2666         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2667                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2668                 break;
2669         default:
2670                 WARN(1, "unexpected: %d", rma);
2671         }
2672 }
2673
2674 static void ieee80211_sta_timer(unsigned long data)
2675 {
2676         struct ieee80211_sub_if_data *sdata =
2677                 (struct ieee80211_sub_if_data *) data;
2678         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2679         struct ieee80211_local *local = sdata->local;
2680
2681         if (local->quiescing) {
2682                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2683                 return;
2684         }
2685
2686         ieee80211_queue_work(&local->hw, &sdata->work);
2687 }
2688
2689 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2690                                           u8 *bssid, u8 reason)
2691 {
2692         struct ieee80211_local *local = sdata->local;
2693         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2694         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2695
2696         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2697                           IEEE80211_STA_BEACON_POLL);
2698
2699         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2700                                false, frame_buf);
2701         mutex_unlock(&ifmgd->mtx);
2702
2703         /*
2704          * must be outside lock due to cfg80211,
2705          * but that's not a problem.
2706          */
2707         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2708
2709         mutex_lock(&local->mtx);
2710         ieee80211_recalc_idle(local);
2711         mutex_unlock(&local->mtx);
2712
2713         mutex_lock(&ifmgd->mtx);
2714 }
2715
2716 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2717 {
2718         struct ieee80211_local *local = sdata->local;
2719         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2720         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2721
2722         lockdep_assert_held(&ifmgd->mtx);
2723
2724         if (WARN_ON_ONCE(!auth_data))
2725                 return -EINVAL;
2726
2727         auth_data->tries++;
2728
2729         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2730                 printk(KERN_DEBUG "%s: authentication with %pM timed out\n",
2731                        sdata->name, auth_data->bss->bssid);
2732
2733                 /*
2734                  * Most likely AP is not in the range so remove the
2735                  * bss struct for that AP.
2736                  */
2737                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2738
2739                 return -ETIMEDOUT;
2740         }
2741
2742         if (auth_data->bss->proberesp_ies) {
2743                 printk(KERN_DEBUG "%s: send auth to %pM (try %d/%d)\n",
2744                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2745                        IEEE80211_AUTH_MAX_TRIES);
2746
2747                 auth_data->expected_transaction = 2;
2748                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2749                                     auth_data->ie, auth_data->ie_len,
2750                                     auth_data->bss->bssid,
2751                                     auth_data->bss->bssid, NULL, 0, 0);
2752         } else {
2753                 const u8 *ssidie;
2754
2755                 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
2756                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2757                        IEEE80211_AUTH_MAX_TRIES);
2758
2759                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2760                 if (!ssidie)
2761                         return -EINVAL;
2762                 /*
2763                  * Direct probe is sent to broadcast address as some APs
2764                  * will not answer to direct packet in unassociated state.
2765                  */
2766                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2767                                          NULL, 0, (u32) -1, true, false);
2768         }
2769
2770         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2771         run_again(ifmgd, auth_data->timeout);
2772
2773         return 0;
2774 }
2775
2776 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2777 {
2778         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2779         struct ieee80211_local *local = sdata->local;
2780
2781         lockdep_assert_held(&sdata->u.mgd.mtx);
2782
2783         assoc_data->tries++;
2784         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2785                 printk(KERN_DEBUG "%s: association with %pM timed out\n",
2786                        sdata->name, assoc_data->bss->bssid);
2787
2788                 /*
2789                  * Most likely AP is not in the range so remove the
2790                  * bss struct for that AP.
2791                  */
2792                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2793
2794                 return -ETIMEDOUT;
2795         }
2796
2797         printk(KERN_DEBUG "%s: associate with %pM (try %d/%d)\n",
2798                sdata->name, assoc_data->bss->bssid, assoc_data->tries,
2799                IEEE80211_ASSOC_MAX_TRIES);
2800         ieee80211_send_assoc(sdata);
2801
2802         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2803         run_again(&sdata->u.mgd, assoc_data->timeout);
2804
2805         return 0;
2806 }
2807
2808 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2809 {
2810         struct ieee80211_local *local = sdata->local;
2811         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2812
2813         mutex_lock(&ifmgd->mtx);
2814
2815         if (ifmgd->auth_data &&
2816             time_after(jiffies, ifmgd->auth_data->timeout)) {
2817                 if (ifmgd->auth_data->done) {
2818                         /*
2819                          * ok ... we waited for assoc but userspace didn't,
2820                          * so let's just kill the auth data
2821                          */
2822                         ieee80211_destroy_auth_data(sdata, false);
2823                 } else if (ieee80211_probe_auth(sdata)) {
2824                         u8 bssid[ETH_ALEN];
2825
2826                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2827
2828                         ieee80211_destroy_auth_data(sdata, false);
2829
2830                         mutex_unlock(&ifmgd->mtx);
2831                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2832                         mutex_lock(&ifmgd->mtx);
2833                 }
2834         } else if (ifmgd->auth_data)
2835                 run_again(ifmgd, ifmgd->auth_data->timeout);
2836
2837         if (ifmgd->assoc_data &&
2838             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2839                 if (!ifmgd->assoc_data->have_beacon ||
2840                     ieee80211_do_assoc(sdata)) {
2841                         u8 bssid[ETH_ALEN];
2842
2843                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2844
2845                         ieee80211_destroy_assoc_data(sdata, false);
2846
2847                         mutex_unlock(&ifmgd->mtx);
2848                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2849                         mutex_lock(&ifmgd->mtx);
2850                 }
2851         } else if (ifmgd->assoc_data)
2852                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2853
2854         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2855                             IEEE80211_STA_CONNECTION_POLL) &&
2856             ifmgd->associated) {
2857                 u8 bssid[ETH_ALEN];
2858                 int max_tries;
2859
2860                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2861
2862                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2863                         max_tries = max_nullfunc_tries;
2864                 else
2865                         max_tries = max_probe_tries;
2866
2867                 /* ACK received for nullfunc probing frame */
2868                 if (!ifmgd->probe_send_count)
2869                         ieee80211_reset_ap_probe(sdata);
2870                 else if (ifmgd->nullfunc_failed) {
2871                         if (ifmgd->probe_send_count < max_tries) {
2872 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2873                                 wiphy_debug(local->hw.wiphy,
2874                                             "%s: No ack for nullfunc frame to"
2875                                             " AP %pM, try %d/%i\n",
2876                                             sdata->name, bssid,
2877                                             ifmgd->probe_send_count, max_tries);
2878 #endif
2879                                 ieee80211_mgd_probe_ap_send(sdata);
2880                         } else {
2881 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2882                                 wiphy_debug(local->hw.wiphy,
2883                                             "%s: No ack for nullfunc frame to"
2884                                             " AP %pM, disconnecting.\n",
2885                                             sdata->name, bssid);
2886 #endif
2887                                 ieee80211_sta_connection_lost(sdata, bssid,
2888                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2889                         }
2890                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2891                         run_again(ifmgd, ifmgd->probe_timeout);
2892                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2893 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2894                         wiphy_debug(local->hw.wiphy,
2895                                     "%s: Failed to send nullfunc to AP %pM"
2896                                     " after %dms, disconnecting.\n",
2897                                     sdata->name,
2898                                     bssid, probe_wait_ms);
2899 #endif
2900                         ieee80211_sta_connection_lost(sdata, bssid,
2901                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2902                 } else if (ifmgd->probe_send_count < max_tries) {
2903 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2904                         wiphy_debug(local->hw.wiphy,
2905                                     "%s: No probe response from AP %pM"
2906                                     " after %dms, try %d/%i\n",
2907                                     sdata->name,
2908                                     bssid, probe_wait_ms,
2909                                     ifmgd->probe_send_count, max_tries);
2910 #endif
2911                         ieee80211_mgd_probe_ap_send(sdata);
2912                 } else {
2913                         /*
2914                          * We actually lost the connection ... or did we?
2915                          * Let's make sure!
2916                          */
2917                         wiphy_debug(local->hw.wiphy,
2918                                     "%s: No probe response from AP %pM"
2919                                     " after %dms, disconnecting.\n",
2920                                     sdata->name,
2921                                     bssid, probe_wait_ms);
2922
2923                         ieee80211_sta_connection_lost(sdata, bssid,
2924                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2925                 }
2926         }
2927
2928         mutex_unlock(&ifmgd->mtx);
2929
2930         mutex_lock(&local->mtx);
2931         ieee80211_recalc_idle(local);
2932         mutex_unlock(&local->mtx);
2933 }
2934
2935 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2936 {
2937         struct ieee80211_sub_if_data *sdata =
2938                 (struct ieee80211_sub_if_data *) data;
2939         struct ieee80211_local *local = sdata->local;
2940
2941         if (local->quiescing)
2942                 return;
2943
2944         ieee80211_queue_work(&sdata->local->hw,
2945                              &sdata->u.mgd.beacon_connection_loss_work);
2946 }
2947
2948 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2949 {
2950         struct ieee80211_sub_if_data *sdata =
2951                 (struct ieee80211_sub_if_data *) data;
2952         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2953         struct ieee80211_local *local = sdata->local;
2954
2955         if (local->quiescing)
2956                 return;
2957
2958         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2959 }
2960
2961 static void ieee80211_sta_monitor_work(struct work_struct *work)
2962 {
2963         struct ieee80211_sub_if_data *sdata =
2964                 container_of(work, struct ieee80211_sub_if_data,
2965                              u.mgd.monitor_work);
2966
2967         ieee80211_mgd_probe_ap(sdata, false);
2968 }
2969
2970 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2971 {
2972         u32 flags;
2973
2974         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2975                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2976                                         IEEE80211_STA_CONNECTION_POLL);
2977
2978                 /* let's probe the connection once */
2979                 flags = sdata->local->hw.flags;
2980                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2981                         ieee80211_queue_work(&sdata->local->hw,
2982                                              &sdata->u.mgd.monitor_work);
2983                 /* and do all the other regular work too */
2984                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2985         }
2986 }
2987
2988 #ifdef CONFIG_PM
2989 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2990 {
2991         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2992
2993         /*
2994          * we need to use atomic bitops for the running bits
2995          * only because both timers might fire at the same
2996          * time -- the code here is properly synchronised.
2997          */
2998
2999         cancel_work_sync(&ifmgd->request_smps_work);
3000
3001         cancel_work_sync(&ifmgd->monitor_work);
3002         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
3003         if (del_timer_sync(&ifmgd->timer))
3004                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
3005
3006         cancel_work_sync(&ifmgd->chswitch_work);
3007         if (del_timer_sync(&ifmgd->chswitch_timer))
3008                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
3009
3010         /* these will just be re-established on connection */
3011         del_timer_sync(&ifmgd->conn_mon_timer);
3012         del_timer_sync(&ifmgd->bcn_mon_timer);
3013 }
3014
3015 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3016 {
3017         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3018
3019         if (!ifmgd->associated)
3020                 return;
3021
3022         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3023                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3024                 mutex_lock(&ifmgd->mtx);
3025                 if (ifmgd->associated) {
3026 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
3027                         wiphy_debug(sdata->local->hw.wiphy,
3028                                     "%s: driver requested disconnect after resume.\n",
3029                                     sdata->name);
3030 #endif
3031                         ieee80211_sta_connection_lost(sdata,
3032                                 ifmgd->associated->bssid,
3033                                 WLAN_REASON_UNSPECIFIED);
3034                         mutex_unlock(&ifmgd->mtx);
3035                         return;
3036                 }
3037                 mutex_unlock(&ifmgd->mtx);
3038         }
3039
3040         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
3041                 add_timer(&ifmgd->timer);
3042         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
3043                 add_timer(&ifmgd->chswitch_timer);
3044         ieee80211_sta_reset_beacon_monitor(sdata);
3045         ieee80211_restart_sta_timer(sdata);
3046 }
3047 #endif
3048
3049 /* interface setup */
3050 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3051 {
3052         struct ieee80211_if_managed *ifmgd;
3053
3054         ifmgd = &sdata->u.mgd;
3055         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3056         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3057         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3058                   ieee80211_beacon_connection_loss_work);
3059         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3060         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3061                     (unsigned long) sdata);
3062         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3063                     (unsigned long) sdata);
3064         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3065                     (unsigned long) sdata);
3066         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3067                     (unsigned long) sdata);
3068
3069         ifmgd->flags = 0;
3070         ifmgd->powersave = sdata->wdev.ps;
3071
3072         mutex_init(&ifmgd->mtx);
3073
3074         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3075                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3076         else
3077                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3078 }
3079
3080 /* scan finished notification */
3081 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3082 {
3083         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
3084
3085         /* Restart STA timers */
3086         rcu_read_lock();
3087         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3088                 ieee80211_restart_sta_timer(sdata);
3089         rcu_read_unlock();
3090 }
3091
3092 int ieee80211_max_network_latency(struct notifier_block *nb,
3093                                   unsigned long data, void *dummy)
3094 {
3095         s32 latency_usec = (s32) data;
3096         struct ieee80211_local *local =
3097                 container_of(nb, struct ieee80211_local,
3098                              network_latency_notifier);
3099
3100         mutex_lock(&local->iflist_mtx);
3101         ieee80211_recalc_ps(local, latency_usec);
3102         mutex_unlock(&local->iflist_mtx);
3103
3104         return 0;
3105 }
3106
3107 /* config hooks */
3108 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3109                        struct cfg80211_auth_request *req)
3110 {
3111         struct ieee80211_local *local = sdata->local;
3112         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3113         struct ieee80211_mgd_auth_data *auth_data;
3114         struct sta_info *sta;
3115         u16 auth_alg;
3116         int err;
3117
3118         /* prepare auth data structure */
3119
3120         switch (req->auth_type) {
3121         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3122                 auth_alg = WLAN_AUTH_OPEN;
3123                 break;
3124         case NL80211_AUTHTYPE_SHARED_KEY:
3125                 if (IS_ERR(local->wep_tx_tfm))
3126                         return -EOPNOTSUPP;
3127                 auth_alg = WLAN_AUTH_SHARED_KEY;
3128                 break;
3129         case NL80211_AUTHTYPE_FT:
3130                 auth_alg = WLAN_AUTH_FT;
3131                 break;
3132         case NL80211_AUTHTYPE_NETWORK_EAP:
3133                 auth_alg = WLAN_AUTH_LEAP;
3134                 break;
3135         default:
3136                 return -EOPNOTSUPP;
3137         }
3138
3139         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3140         if (!auth_data)
3141                 return -ENOMEM;
3142
3143         auth_data->bss = req->bss;
3144
3145         if (req->ie && req->ie_len) {
3146                 memcpy(auth_data->ie, req->ie, req->ie_len);
3147                 auth_data->ie_len = req->ie_len;
3148         }
3149
3150         if (req->key && req->key_len) {
3151                 auth_data->key_len = req->key_len;
3152                 auth_data->key_idx = req->key_idx;
3153                 memcpy(auth_data->key, req->key, req->key_len);
3154         }
3155
3156         auth_data->algorithm = auth_alg;
3157
3158         /* try to authenticate/probe */
3159
3160         mutex_lock(&ifmgd->mtx);
3161
3162         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3163             ifmgd->assoc_data) {
3164                 err = -EBUSY;
3165                 goto err_free;
3166         }
3167
3168         if (ifmgd->auth_data)
3169                 ieee80211_destroy_auth_data(sdata, false);
3170
3171         /* prep auth_data so we don't go into idle on disassoc */
3172         ifmgd->auth_data = auth_data;
3173
3174         if (ifmgd->associated)
3175                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3176
3177         printk(KERN_DEBUG "%s: authenticate with %pM\n",
3178                sdata->name, req->bss->bssid);
3179
3180         mutex_lock(&local->mtx);
3181         ieee80211_recalc_idle(sdata->local);
3182         mutex_unlock(&local->mtx);
3183
3184         /* switch to the right channel */
3185         local->oper_channel = req->bss->channel;
3186         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3187
3188         /* set BSSID */
3189         memcpy(ifmgd->bssid, req->bss->bssid, ETH_ALEN);
3190         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3191
3192         /* add station entry */
3193         sta = sta_info_alloc(sdata, req->bss->bssid, GFP_KERNEL);
3194         if (!sta) {
3195                 err = -ENOMEM;
3196                 goto err_clear;
3197         }
3198
3199         err = sta_info_insert(sta);
3200         if (err) {
3201                 printk(KERN_DEBUG
3202                        "%s: failed to insert STA entry for the AP %pM (error %d)\n",
3203                        sdata->name, req->bss->bssid, err);
3204                 goto err_clear;
3205         }
3206
3207         err = ieee80211_probe_auth(sdata);
3208         if (err) {
3209                 sta_info_destroy_addr(sdata, req->bss->bssid);
3210                 goto err_clear;
3211         }
3212
3213         /* hold our own reference */
3214         cfg80211_ref_bss(auth_data->bss);
3215         err = 0;
3216         goto out_unlock;
3217
3218  err_clear:
3219         ifmgd->auth_data = NULL;
3220  err_free:
3221         kfree(auth_data);
3222  out_unlock:
3223         mutex_unlock(&ifmgd->mtx);
3224
3225         return err;
3226 }
3227
3228 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3229                         struct cfg80211_assoc_request *req)
3230 {
3231         struct ieee80211_local *local = sdata->local;
3232         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3233         struct ieee80211_bss *bss = (void *)req->bss->priv;
3234         struct ieee80211_mgd_assoc_data *assoc_data;
3235         struct sta_info *sta;
3236         const u8 *ssidie;
3237         int i, err;
3238
3239         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3240         if (!ssidie)
3241                 return -EINVAL;
3242
3243         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3244         if (!assoc_data)
3245                 return -ENOMEM;
3246
3247         mutex_lock(&ifmgd->mtx);
3248
3249         if (ifmgd->associated)
3250                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3251
3252         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3253                 err = -EBUSY;
3254                 goto err_free;
3255         }
3256
3257         if (ifmgd->assoc_data) {
3258                 err = -EBUSY;
3259                 goto err_free;
3260         }
3261
3262         if (ifmgd->auth_data) {
3263                 bool match;
3264
3265                 /* keep sta info, bssid if matching */
3266                 match = compare_ether_addr(ifmgd->bssid, req->bss->bssid) == 0;
3267                 ieee80211_destroy_auth_data(sdata, match);
3268         }
3269
3270         /* prepare assoc data */
3271
3272         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3273         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3274
3275         ifmgd->beacon_crc_valid = false;
3276
3277         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
3278                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3279                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3280                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
3281                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3282
3283         if (req->flags & ASSOC_REQ_DISABLE_HT)
3284                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3285
3286         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3287         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3288                sizeof(ifmgd->ht_capa_mask));
3289
3290         if (req->ie && req->ie_len) {
3291                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3292                 assoc_data->ie_len = req->ie_len;
3293         }
3294
3295         assoc_data->bss = req->bss;
3296
3297         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3298                 if (ifmgd->powersave)
3299                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3300                 else
3301                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3302         } else
3303                 ifmgd->ap_smps = ifmgd->req_smps;
3304
3305         /*
3306          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3307          * We still associate in non-HT mode (11a/b/g) if any one of these
3308          * ciphers is configured as pairwise.
3309          * We can set this to true for non-11n hardware, that'll be checked
3310          * separately along with the peer capabilities.
3311          */
3312         assoc_data->capability = req->bss->capability;
3313         assoc_data->wmm_used = bss->wmm_used;
3314         assoc_data->supp_rates = bss->supp_rates;
3315         assoc_data->supp_rates_len = bss->supp_rates_len;
3316         assoc_data->ht_information_ie =
3317                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
3318
3319         if (bss->wmm_used && bss->uapsd_supported &&
3320             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3321                 assoc_data->uapsd_used = true;
3322                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3323         } else {
3324                 assoc_data->uapsd_used = false;
3325                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3326         }
3327
3328         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3329         assoc_data->ssid_len = ssidie[1];
3330
3331         if (req->prev_bssid)
3332                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3333
3334         if (req->use_mfp) {
3335                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3336                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3337         } else {
3338                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3339                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3340         }
3341
3342         if (req->crypto.control_port)
3343                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3344         else
3345                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3346
3347         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3348         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3349
3350         /* kick off associate process */
3351
3352         ifmgd->assoc_data = assoc_data;
3353
3354         mutex_lock(&local->mtx);
3355         ieee80211_recalc_idle(sdata->local);
3356         mutex_unlock(&local->mtx);
3357
3358         /* switch to the right channel */
3359         local->oper_channel = req->bss->channel;
3360         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3361
3362         rcu_read_lock();
3363         sta = sta_info_get(sdata, req->bss->bssid);
3364         rcu_read_unlock();
3365
3366         if (!sta) {
3367                 /* set BSSID */
3368                 memcpy(ifmgd->bssid, req->bss->bssid, ETH_ALEN);
3369                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3370
3371                 sta = sta_info_alloc(sdata, req->bss->bssid, GFP_KERNEL);
3372                 if (!sta) {
3373                         err = -ENOMEM;
3374                         goto err_clear;
3375                 }
3376
3377                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3378
3379                 err = sta_info_insert(sta);
3380                 sta = NULL;
3381                 if (err) {
3382                         printk(KERN_DEBUG
3383                                "%s: failed to insert STA entry for the AP (error %d)\n",
3384                                sdata->name, err);
3385                         goto err_clear;
3386                 }
3387         } else
3388                 WARN_ON_ONCE(compare_ether_addr(ifmgd->bssid, req->bss->bssid));
3389
3390         if (!bss->dtim_period &&
3391             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3392                 /*
3393                  * Wait up to one beacon interval ...
3394                  * should this be more if we miss one?
3395                  */
3396                 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
3397                        sdata->name, ifmgd->bssid);
3398                 assoc_data->timeout = jiffies +
3399                                 TU_TO_EXP_TIME(req->bss->beacon_interval);
3400         } else {
3401                 assoc_data->have_beacon = true;
3402                 assoc_data->sent_assoc = false;
3403                 assoc_data->timeout = jiffies;
3404         }
3405         run_again(ifmgd, assoc_data->timeout);
3406
3407         if (bss->corrupt_data) {
3408                 char *corrupt_type = "data";
3409                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3410                         if (bss->corrupt_data &
3411                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3412                                 corrupt_type = "beacon and probe response";
3413                         else
3414                                 corrupt_type = "beacon";
3415                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3416                         corrupt_type = "probe response";
3417                 printk(KERN_DEBUG "%s: associating with AP with corrupt %s\n",
3418                        sdata->name, corrupt_type);
3419         }
3420
3421         err = 0;
3422         goto out;
3423  err_clear:
3424         ifmgd->assoc_data = NULL;
3425  err_free:
3426         kfree(assoc_data);
3427  out:
3428         mutex_unlock(&ifmgd->mtx);
3429
3430         return err;
3431 }
3432
3433 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3434                          struct cfg80211_deauth_request *req)
3435 {
3436         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3437         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3438
3439         mutex_lock(&ifmgd->mtx);
3440
3441         if (ifmgd->auth_data) {
3442                 ieee80211_destroy_auth_data(sdata, false);
3443                 mutex_unlock(&ifmgd->mtx);
3444                 return 0;
3445         }
3446
3447         printk(KERN_DEBUG
3448                "%s: deauthenticating from %pM by local choice (reason=%d)\n",
3449                sdata->name, req->bssid, req->reason_code);
3450
3451         if (ifmgd->associated &&
3452             compare_ether_addr(ifmgd->associated->bssid, req->bssid) == 0)
3453                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3454                                        req->reason_code, true, frame_buf);
3455         else
3456                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3457                                                IEEE80211_STYPE_DEAUTH,
3458                                                req->reason_code, true,
3459                                                frame_buf);
3460         mutex_unlock(&ifmgd->mtx);
3461
3462         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3463
3464         mutex_lock(&sdata->local->mtx);
3465         ieee80211_recalc_idle(sdata->local);
3466         mutex_unlock(&sdata->local->mtx);
3467
3468         return 0;
3469 }
3470
3471 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3472                            struct cfg80211_disassoc_request *req)
3473 {
3474         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3475         u8 bssid[ETH_ALEN];
3476         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3477
3478         mutex_lock(&ifmgd->mtx);
3479
3480         /*
3481          * cfg80211 should catch this ... but it's racy since
3482          * we can receive a disassoc frame, process it, hand it
3483          * to cfg80211 while that's in a locked section already
3484          * trying to tell us that the user wants to disconnect.
3485          */
3486         if (ifmgd->associated != req->bss) {
3487                 mutex_unlock(&ifmgd->mtx);
3488                 return -ENOLINK;
3489         }
3490
3491         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
3492                sdata->name, req->bss->bssid, req->reason_code);
3493
3494         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3495         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3496                                req->reason_code, !req->local_state_change,
3497                                frame_buf);
3498         mutex_unlock(&ifmgd->mtx);
3499
3500         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3501
3502         mutex_lock(&sdata->local->mtx);
3503         ieee80211_recalc_idle(sdata->local);
3504         mutex_unlock(&sdata->local->mtx);
3505
3506         return 0;
3507 }
3508
3509 void ieee80211_mgd_teardown(struct ieee80211_sub_if_data *sdata)
3510 {
3511         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3512
3513         mutex_lock(&ifmgd->mtx);
3514         if (ifmgd->assoc_data)
3515                 ieee80211_destroy_assoc_data(sdata, false);
3516         if (ifmgd->auth_data)
3517                 ieee80211_destroy_auth_data(sdata, false);
3518         del_timer_sync(&ifmgd->timer);
3519         mutex_unlock(&ifmgd->mtx);
3520 }
3521
3522 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3523                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3524                                gfp_t gfp)
3525 {
3526         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3527
3528         trace_api_cqm_rssi_notify(sdata, rssi_event);
3529
3530         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3531 }
3532 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
3533
3534 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
3535 {
3536         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3537         return sdata->dev->operstate;
3538 }
3539 EXPORT_SYMBOL(ieee80211_get_operstate);