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         prev_chantype = sdata->vif.bss_conf.channel_type;
 196
 197
 198         hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
 199                                                    sband->band);
 200         /* check that channel matches the right operating channel */
 201         if (local->hw.conf.channel->center_freq != hti_cfreq) {
 202                 /* Some APs mess this up, evidently.
 203                  * Netgear WNDR3700 sometimes reports 4 higher than
 204                  * the actual channel, for instance.
 205                  */
 206                 printk(KERN_DEBUG
 207                        "%s: Wrong control channel in association"
 208                        " response: configured center-freq: %d"
 209                        " hti-cfreq: %d  hti->control_chan: %d"
 210                        " band: %d.  Disabling HT.\n",
 211                        sdata->name,
 212                        local->hw.conf.channel->center_freq,
 213                        hti_cfreq, hti->control_chan,
 214                        sband->band);
 215                 enable_ht = false;
 216         }
 217
 218         if (enable_ht) {
 219                 channel_type = NL80211_CHAN_HT20;
 220
 221                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 222                     !ieee80111_cfg_override_disables_ht40(sdata) &&
 223                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 224                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 225                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 226                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 227                                 if (!(local->hw.conf.channel->flags &
 228                                     IEEE80211_CHAN_NO_HT40PLUS))
 229                                         channel_type = NL80211_CHAN_HT40PLUS;
 230                                 break;
 231                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 232                                 if (!(local->hw.conf.channel->flags &
 233                                     IEEE80211_CHAN_NO_HT40MINUS))
 234                                         channel_type = NL80211_CHAN_HT40MINUS;
 235                                 break;
 236                         }
 237                 }
 238         }
 239
 240         if (local->tmp_channel)
 241                 local->tmp_channel_type = channel_type;
 242
 243         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
 244                 /* can only fail due to HT40+/- mismatch */
 245                 channel_type = NL80211_CHAN_HT20;
 246                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
 247         }
 248
 249         if (beacon_htcap_ie && (prev_chantype != channel_type)) {
 250                 /*
 251                  * Whenever the AP announces the HT mode change that can be
 252                  * 40MHz intolerant or etc., it would be safer to stop tx
 253                  * queues before doing hw config to avoid buffer overflow.
 254                  */
 255                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 256                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
 257
 258                 /* flush out all packets */
 259                 synchronize_net();
 260
 261                 drv_flush(local, false);
 262         }
 263
 264         /* channel_type change automatically detected */
 265         ieee80211_hw_config(local, 0);
 266
 267         if (prev_chantype != channel_type) {
 268                 rcu_read_lock();
 269                 sta = sta_info_get(sdata, bssid);
 270                 if (sta)
 271                         rate_control_rate_update(local, sband, sta,
 272                                                  IEEE80211_RC_HT_CHANGED,
 273                                                  channel_type);
 274                 rcu_read_unlock();
 275
 276                 if (beacon_htcap_ie)
 277                         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 278                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
 279         }
 280
 281         ht_opmode = le16_to_cpu(hti->operation_mode);
 282
 283         /* if bss configuration changed store the new one */
 284         if (sdata->ht_opmode_valid != enable_ht ||
 285             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
 286             prev_chantype != channel_type) {
 287                 changed |= BSS_CHANGED_HT;
 288                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 289                 sdata->ht_opmode_valid = enable_ht;
 290         }
 291
 292         return changed;
 293 }
 294
 295 /* frame sending functions */
 296
 297 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 298                                       struct ieee80211_supported_band *sband,
 299                                       u32 *rates)
 300 {
 301         int i, j, count;
 302         *rates = 0;
 303         count = 0;
 304         for (i = 0; i < supp_rates_len; i++) {
 305                 int rate = (supp_rates[i] & 0x7F) * 5;
 306
 307                 for (j = 0; j < sband->n_bitrates; j++)
 308                         if (sband->bitrates[j].bitrate == rate) {
 309                                 *rates |= BIT(j);
 310                                 count++;
 311                                 break;
 312                         }
 313         }
 314
 315         return count;
 316 }
 317
 318 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 319                                 struct sk_buff *skb, const u8 *ht_info_ie,
 320                                 struct ieee80211_supported_band *sband,
 321                                 struct ieee80211_channel *channel,
 322                                 enum ieee80211_smps_mode smps)
 323 {
 324         struct ieee80211_ht_info *ht_info;
 325         u8 *pos;
 326         u32 flags = channel->flags;
 327         u16 cap;
 328         struct ieee80211_sta_ht_cap ht_cap;
 329
 330         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 331
 332         if (!ht_info_ie)
 333                 return;
 334
 335         if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
 336                 return;
 337
 338         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 339         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 340
 341         ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
 342
 343         /* determine capability flags */
 344         cap = ht_cap.cap;
 345
 346         switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 347         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 348                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 349                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 350                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 351                 }
 352                 break;
 353         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 354                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 355                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 356                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 357                 }
 358                 break;
 359         }
 360
 361         /* set SM PS mode properly */
 362         cap &= ~IEEE80211_HT_CAP_SM_PS;
 363         switch (smps) {
 364         case IEEE80211_SMPS_AUTOMATIC:
 365         case IEEE80211_SMPS_NUM_MODES:
 366                 WARN_ON(1);
 367         case IEEE80211_SMPS_OFF:
 368                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 369                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 370                 break;
 371         case IEEE80211_SMPS_STATIC:
 372                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 373                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 374                 break;
 375         case IEEE80211_SMPS_DYNAMIC:
 376                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 377                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 378                 break;
 379         }
 380
 381         /* reserve and fill IE */
 382         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 383         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 384 }
 385
 386 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 387 {
 388         struct ieee80211_local *local = sdata->local;
 389         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 390         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 391         struct sk_buff *skb;
 392         struct ieee80211_mgmt *mgmt;
 393         u8 *pos, qos_info;
 394         size_t offset = 0, noffset;
 395         int i, count, rates_len, supp_rates_len;
 396         u16 capab;
 397         struct ieee80211_supported_band *sband;
 398         u32 rates = 0;
 399
 400         lockdep_assert_held(&ifmgd->mtx);
 401
 402         sband = local->hw.wiphy->bands[local->oper_channel->band];
 403
 404         if (assoc_data->supp_rates_len) {
 405                 /*
 406                  * Get all rates supported by the device and the AP as
 407                  * some APs don't like getting a superset of their rates
 408                  * in the association request (e.g. D-Link DAP 1353 in
 409                  * b-only mode)...
 410                  */
 411                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 412                                                        assoc_data->supp_rates_len,
 413                                                        sband, &rates);
 414         } else {
 415                 /*
 416                  * In case AP not provide any supported rates information
 417                  * before association, we send information element(s) with
 418                  * all rates that we support.
 419                  */
 420                 rates = ~0;
 421                 rates_len = sband->n_bitrates;
 422         }
 423
 424         skb = alloc_skb(local->hw.extra_tx_headroom +
 425                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 426                         2 + assoc_data->ssid_len + /* SSID */
 427                         4 + rates_len + /* (extended) rates */
 428                         4 + /* power capability */
 429                         2 + 2 * sband->n_channels + /* supported channels */
 430                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 431                         assoc_data->ie_len + /* extra IEs */
 432                         9, /* WMM */
 433                         GFP_KERNEL);
 434         if (!skb)
 435                 return;
 436
 437         skb_reserve(skb, local->hw.extra_tx_headroom);
 438
 439         capab = WLAN_CAPABILITY_ESS;
 440
 441         if (sband->band == IEEE80211_BAND_2GHZ) {
 442                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 443                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 444                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 445                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 446         }
 447
 448         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 449                 capab |= WLAN_CAPABILITY_PRIVACY;
 450
 451         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 452             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 453                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 454
 455         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 456         memset(mgmt, 0, 24);
 457         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 458         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 459         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 460
 461         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 462                 skb_put(skb, 10);
 463                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 464                                                   IEEE80211_STYPE_REASSOC_REQ);
 465                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 466                 mgmt->u.reassoc_req.listen_interval =
 467                                 cpu_to_le16(local->hw.conf.listen_interval);
 468                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 469                        ETH_ALEN);
 470         } else {
 471                 skb_put(skb, 4);
 472                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 473                                                   IEEE80211_STYPE_ASSOC_REQ);
 474                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 475                 mgmt->u.assoc_req.listen_interval =
 476                                 cpu_to_le16(local->hw.conf.listen_interval);
 477         }
 478
 479         /* SSID */
 480         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 481         *pos++ = WLAN_EID_SSID;
 482         *pos++ = assoc_data->ssid_len;
 483         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 484
 485         /* add all rates which were marked to be used above */
 486         supp_rates_len = rates_len;
 487         if (supp_rates_len > 8)
 488                 supp_rates_len = 8;
 489
 490         pos = skb_put(skb, supp_rates_len + 2);
 491         *pos++ = WLAN_EID_SUPP_RATES;
 492         *pos++ = supp_rates_len;
 493
 494         count = 0;
 495         for (i = 0; i < sband->n_bitrates; i++) {
 496                 if (BIT(i) & rates) {
 497                         int rate = sband->bitrates[i].bitrate;
 498                         *pos++ = (u8) (rate / 5);
 499                         if (++count == 8)
 500                                 break;
 501                 }
 502         }
 503
 504         if (rates_len > count) {
 505                 pos = skb_put(skb, rates_len - count + 2);
 506                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 507                 *pos++ = rates_len - count;
 508
 509                 for (i++; i < sband->n_bitrates; i++) {
 510                         if (BIT(i) & rates) {
 511                                 int rate = sband->bitrates[i].bitrate;
 512                                 *pos++ = (u8) (rate / 5);
 513                         }
 514                 }
 515         }
 516
 517         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 518                 /* 1. power capabilities */
 519                 pos = skb_put(skb, 4);
 520                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 521                 *pos++ = 2;
 522                 *pos++ = 0; /* min tx power */
 523                 *pos++ = local->oper_channel->max_power; /* max tx power */
 524
 525                 /* 2. supported channels */
 526                 /* TODO: get this in reg domain format */
 527                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 528                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 529                 *pos++ = 2 * sband->n_channels;
 530                 for (i = 0; i < sband->n_channels; i++) {
 531                         *pos++ = ieee80211_frequency_to_channel(
 532                                         sband->channels[i].center_freq);
 533                         *pos++ = 1; /* one channel in the subband*/
 534                 }
 535         }
 536
 537         /* if present, add any custom IEs that go before HT */
 538         if (assoc_data->ie_len && assoc_data->ie) {
 539                 static const u8 before_ht[] = {
 540                         WLAN_EID_SSID,
 541                         WLAN_EID_SUPP_RATES,
 542                         WLAN_EID_EXT_SUPP_RATES,
 543                         WLAN_EID_PWR_CAPABILITY,
 544                         WLAN_EID_SUPPORTED_CHANNELS,
 545                         WLAN_EID_RSN,
 546                         WLAN_EID_QOS_CAPA,
 547                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 548                         WLAN_EID_MOBILITY_DOMAIN,
 549                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 550                 };
 551                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 552                                              before_ht, ARRAY_SIZE(before_ht),
 553                                              offset);
 554                 pos = skb_put(skb, noffset - offset);
 555                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 556                 offset = noffset;
 557         }
 558
 559         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 560                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ht_information_ie,
 561                                     sband, local->oper_channel, ifmgd->ap_smps);
 562
 563         /* if present, add any custom non-vendor IEs that go after HT */
 564         if (assoc_data->ie_len && assoc_data->ie) {
 565                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 566                                                     assoc_data->ie_len,
 567                                                     offset);
 568                 pos = skb_put(skb, noffset - offset);
 569                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 570                 offset = noffset;
 571         }
 572
 573         if (assoc_data->wmm) {
 574                 if (assoc_data->uapsd) {
 575                         qos_info = local->uapsd_queues;
 576                         qos_info |= (local->uapsd_max_sp_len <<
 577                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 578                 } else {
 579                         qos_info = 0;
 580                 }
 581
 582                 pos = skb_put(skb, 9);
 583                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 584                 *pos++ = 7; /* len */
 585                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 586                 *pos++ = 0x50;
 587                 *pos++ = 0xf2;
 588                 *pos++ = 2; /* WME */
 589                 *pos++ = 0; /* WME info */
 590                 *pos++ = 1; /* WME ver */
 591                 *pos++ = qos_info;
 592         }
 593
 594         /* add any remaining custom (i.e. vendor specific here) IEs */
 595         if (assoc_data->ie_len && assoc_data->ie) {
 596                 noffset = assoc_data->ie_len;
 597                 pos = skb_put(skb, noffset - offset);
 598                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 599         }
 600
 601         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 602         ieee80211_tx_skb(sdata, skb);
 603 }
 604
 605 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 606                                            const u8 *bssid, u16 stype,
 607                                            u16 reason, bool send_frame,
 608                                            u8 *frame_buf)
 609 {
 610         struct ieee80211_local *local = sdata->local;
 611         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 612         struct sk_buff *skb;
 613         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 614
 615         /* build frame */
 616         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 617         mgmt->duration = 0; /* initialize only */
 618         mgmt->seq_ctrl = 0; /* initialize only */
 619         memcpy(mgmt->da, bssid, ETH_ALEN);
 620         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 621         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 622         /* u.deauth.reason_code == u.disassoc.reason_code */
 623         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 624
 625         if (send_frame) {
 626                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 627                                     DEAUTH_DISASSOC_LEN);
 628                 if (!skb)
 629                         return;
 630
 631                 skb_reserve(skb, local->hw.extra_tx_headroom);
 632
 633                 /* copy in frame */
 634                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 635                        mgmt, DEAUTH_DISASSOC_LEN);
 636
 637                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 638                         IEEE80211_SKB_CB(skb)->flags |=
 639                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
 640                 ieee80211_tx_skb(sdata, skb);
 641         }
 642 }
 643
 644 void ieee80211_send_pspoll(struct ieee80211_local *local,
 645                            struct ieee80211_sub_if_data *sdata)
 646 {
 647         struct ieee80211_pspoll *pspoll;
 648         struct sk_buff *skb;
 649
 650         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 651         if (!skb)
 652                 return;
 653
 654         pspoll = (struct ieee80211_pspoll *) skb->data;
 655         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 656
 657         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 658         ieee80211_tx_skb(sdata, skb);
 659 }
 660
 661 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 662                              struct ieee80211_sub_if_data *sdata,
 663                              int powersave)
 664 {
 665         struct sk_buff *skb;
 666         struct ieee80211_hdr_3addr *nullfunc;
 667         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 668
 669         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 670         if (!skb)
 671                 return;
 672
 673         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 674         if (powersave)
 675                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 676
 677         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 678         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 679                             IEEE80211_STA_CONNECTION_POLL))
 680                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 681
 682         ieee80211_tx_skb(sdata, skb);
 683 }
 684
 685 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 686                                           struct ieee80211_sub_if_data *sdata)
 687 {
 688         struct sk_buff *skb;
 689         struct ieee80211_hdr *nullfunc;
 690         __le16 fc;
 691
 692         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 693                 return;
 694
 695         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 696         if (!skb)
 697                 return;
 698
 699         skb_reserve(skb, local->hw.extra_tx_headroom);
 700
 701         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 702         memset(nullfunc, 0, 30);
 703         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 704                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 705         nullfunc->frame_control = fc;
 706         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 707         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 708         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 709         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 710
 711         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 712         ieee80211_tx_skb(sdata, skb);
 713 }
 714
 715 /* spectrum management related things */
 716 static void ieee80211_chswitch_work(struct work_struct *work)
 717 {
 718         struct ieee80211_sub_if_data *sdata =
 719                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 720         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 721
 722         if (!ieee80211_sdata_running(sdata))
 723                 return;
 724
 725         mutex_lock(&ifmgd->mtx);
 726         if (!ifmgd->associated)
 727                 goto out;
 728
 729         sdata->local->oper_channel = sdata->local->csa_channel;
 730         if (!sdata->local->ops->channel_switch) {
 731                 /* call "hw_config" only if doing sw channel switch */
 732                 ieee80211_hw_config(sdata->local,
 733                         IEEE80211_CONF_CHANGE_CHANNEL);
 734         } else {
 735                 /* update the device channel directly */
 736                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 737         }
 738
 739         /* XXX: shouldn't really modify cfg80211-owned data! */
 740         ifmgd->associated->channel = sdata->local->oper_channel;
 741
 742         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 743                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 744  out:
 745         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 746         mutex_unlock(&ifmgd->mtx);
 747 }
 748
 749 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 750 {
 751         struct ieee80211_sub_if_data *sdata;
 752         struct ieee80211_if_managed *ifmgd;
 753
 754         sdata = vif_to_sdata(vif);
 755         ifmgd = &sdata->u.mgd;
 756
 757         trace_api_chswitch_done(sdata, success);
 758         if (!success) {
 759                 /*
 760                  * If the channel switch was not successful, stay
 761                  * around on the old channel. We currently lack
 762                  * good handling of this situation, possibly we
 763                  * should just drop the association.
 764                  */
 765                 sdata->local->csa_channel = sdata->local->oper_channel;
 766         }
 767
 768         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 769 }
 770 EXPORT_SYMBOL(ieee80211_chswitch_done);
 771
 772 static void ieee80211_chswitch_timer(unsigned long data)
 773 {
 774         struct ieee80211_sub_if_data *sdata =
 775                 (struct ieee80211_sub_if_data *) data;
 776         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 777
 778         if (sdata->local->quiescing) {
 779                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 780                 return;
 781         }
 782
 783         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 784 }
 785
 786 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 787                                       struct ieee80211_channel_sw_ie *sw_elem,
 788                                       struct ieee80211_bss *bss,
 789                                       u64 timestamp)
 790 {
 791         struct cfg80211_bss *cbss =
 792                 container_of((void *)bss, struct cfg80211_bss, priv);
 793         struct ieee80211_channel *new_ch;
 794         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 795         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 796                                                       cbss->channel->band);
 797
 798         ASSERT_MGD_MTX(ifmgd);
 799
 800         if (!ifmgd->associated)
 801                 return;
 802
 803         if (sdata->local->scanning)
 804                 return;
 805
 806         /* Disregard subsequent beacons if we are already running a timer
 807            processing a CSA */
 808
 809         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 810                 return;
 811
 812         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 813         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 814                 return;
 815
 816         sdata->local->csa_channel = new_ch;
 817
 818         if (sdata->local->ops->channel_switch) {
 819                 /* use driver's channel switch callback */
 820                 struct ieee80211_channel_switch ch_switch;
 821                 memset(&ch_switch, 0, sizeof(ch_switch));
 822                 ch_switch.timestamp = timestamp;
 823                 if (sw_elem->mode) {
 824                         ch_switch.block_tx = true;
 825                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 826                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 827                 }
 828                 ch_switch.channel = new_ch;
 829                 ch_switch.count = sw_elem->count;
 830                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 831                 drv_channel_switch(sdata->local, &ch_switch);
 832                 return;
 833         }
 834
 835         /* channel switch handled in software */
 836         if (sw_elem->count <= 1) {
 837                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 838         } else {
 839                 if (sw_elem->mode)
 840                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 841                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 842                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 843                 mod_timer(&ifmgd->chswitch_timer,
 844                           jiffies +
 845                           msecs_to_jiffies(sw_elem->count *
 846                                            cbss->beacon_interval));
 847         }
 848 }
 849
 850 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 851                                         u16 capab_info, u8 *pwr_constr_elem,
 852                                         u8 pwr_constr_elem_len)
 853 {
 854         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 855
 856         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 857                 return;
 858
 859         /* Power constraint IE length should be 1 octet */
 860         if (pwr_constr_elem_len != 1)
 861                 return;
 862
 863         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 864             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 865                 sdata->local->power_constr_level = *pwr_constr_elem;
 866                 ieee80211_hw_config(sdata->local, 0);
 867         }
 868 }
 869
 870 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 871 {
 872         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 873         struct ieee80211_local *local = sdata->local;
 874         struct ieee80211_conf *conf = &local->hw.conf;
 875
 876         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 877                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 878                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 879
 880         local->disable_dynamic_ps = false;
 881         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 882 }
 883 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 884
 885 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 886 {
 887         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 888         struct ieee80211_local *local = sdata->local;
 889         struct ieee80211_conf *conf = &local->hw.conf;
 890
 891         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 892                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 893                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 894
 895         local->disable_dynamic_ps = true;
 896         conf->dynamic_ps_timeout = 0;
 897         del_timer_sync(&local->dynamic_ps_timer);
 898         ieee80211_queue_work(&local->hw,
 899                              &local->dynamic_ps_enable_work);
 900 }
 901 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 902
 903 /* powersave */
 904 static void ieee80211_enable_ps(struct ieee80211_local *local,
 905                                 struct ieee80211_sub_if_data *sdata)
 906 {
 907         struct ieee80211_conf *conf = &local->hw.conf;
 908
 909         /*
 910          * If we are scanning right now then the parameters will
 911          * take effect when scan finishes.
 912          */
 913         if (local->scanning)
 914                 return;
 915
 916         if (conf->dynamic_ps_timeout > 0 &&
 917             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 918                 mod_timer(&local->dynamic_ps_timer, jiffies +
 919                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 920         } else {
 921                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 922                         ieee80211_send_nullfunc(local, sdata, 1);
 923
 924                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 925                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 926                         return;
 927
 928                 conf->flags |= IEEE80211_CONF_PS;
 929                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 930         }
 931 }
 932
 933 static void ieee80211_change_ps(struct ieee80211_local *local)
 934 {
 935         struct ieee80211_conf *conf = &local->hw.conf;
 936
 937         if (local->ps_sdata) {
 938                 ieee80211_enable_ps(local, local->ps_sdata);
 939         } else if (conf->flags & IEEE80211_CONF_PS) {
 940                 conf->flags &= ~IEEE80211_CONF_PS;
 941                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 942                 del_timer_sync(&local->dynamic_ps_timer);
 943                 cancel_work_sync(&local->dynamic_ps_enable_work);
 944         }
 945 }
 946
 947 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 948 {
 949         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 950         struct sta_info *sta = NULL;
 951         bool authorized = false;
 952
 953         if (!mgd->powersave)
 954                 return false;
 955
 956         if (mgd->broken_ap)
 957                 return false;
 958
 959         if (!mgd->associated)
 960                 return false;
 961
 962         if (!mgd->associated->beacon_ies)
 963                 return false;
 964
 965         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 966                           IEEE80211_STA_CONNECTION_POLL))
 967                 return false;
 968
 969         rcu_read_lock();
 970         sta = sta_info_get(sdata, mgd->bssid);
 971         if (sta)
 972                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 973         rcu_read_unlock();
 974
 975         return authorized;
 976 }
 977
 978 /* need to hold RTNL or interface lock */
 979 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 980 {
 981         struct ieee80211_sub_if_data *sdata, *found = NULL;
 982         int count = 0;
 983         int timeout;
 984
 985         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 986                 local->ps_sdata = NULL;
 987                 return;
 988         }
 989
 990         if (!list_empty(&local->work_list)) {
 991                 local->ps_sdata = NULL;
 992                 goto change;
 993         }
 994
 995         list_for_each_entry(sdata, &local->interfaces, list) {
 996                 if (!ieee80211_sdata_running(sdata))
 997                         continue;
 998                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 999                         /* If an AP vif is found, then disable PS
1000                          * by setting the count to zero thereby setting
1001                          * ps_sdata to NULL.
1002                          */
1003                         count = 0;
1004                         break;
1005                 }
1006                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1007                         continue;
1008                 found = sdata;
1009                 count++;
1010         }
1011
1012         if (count == 1 && ieee80211_powersave_allowed(found)) {
1013                 struct ieee80211_conf *conf = &local->hw.conf;
1014                 s32 beaconint_us;
1015
1016                 if (latency < 0)
1017                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1018
1019                 beaconint_us = ieee80211_tu_to_usec(
1020                                         found->vif.bss_conf.beacon_int);
1021
1022                 timeout = local->dynamic_ps_forced_timeout;
1023                 if (timeout < 0) {
1024                         /*
1025                          * Go to full PSM if the user configures a very low
1026                          * latency requirement.
1027                          * The 2000 second value is there for compatibility
1028                          * until the PM_QOS_NETWORK_LATENCY is configured
1029                          * with real values.
1030                          */
1031                         if (latency > (1900 * USEC_PER_MSEC) &&
1032                             latency != (2000 * USEC_PER_SEC))
1033                                 timeout = 0;
1034                         else
1035                                 timeout = 100;
1036                 }
1037                 local->dynamic_ps_user_timeout = timeout;
1038                 if (!local->disable_dynamic_ps)
1039                         conf->dynamic_ps_timeout =
1040                                 local->dynamic_ps_user_timeout;
1041
1042                 if (beaconint_us > latency) {
1043                         local->ps_sdata = NULL;
1044                 } else {
1045                         struct ieee80211_bss *bss;
1046                         int maxslp = 1;
1047                         u8 dtimper;
1048
1049                         bss = (void *)found->u.mgd.associated->priv;
1050                         dtimper = bss->dtim_period;
1051
1052                         /* If the TIM IE is invalid, pretend the value is 1 */
1053                         if (!dtimper)
1054                                 dtimper = 1;
1055                         else if (dtimper > 1)
1056                                 maxslp = min_t(int, dtimper,
1057                                                     latency / beaconint_us);
1058
1059                         local->hw.conf.max_sleep_period = maxslp;
1060                         local->hw.conf.ps_dtim_period = dtimper;
1061                         local->ps_sdata = found;
1062                 }
1063         } else {
1064                 local->ps_sdata = NULL;
1065         }
1066
1067  change:
1068         ieee80211_change_ps(local);
1069 }
1070
1071 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1072 {
1073         struct ieee80211_local *local =
1074                 container_of(work, struct ieee80211_local,
1075                              dynamic_ps_disable_work);
1076
1077         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1078                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1079                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1080         }
1081
1082         ieee80211_wake_queues_by_reason(&local->hw,
1083                                         IEEE80211_QUEUE_STOP_REASON_PS);
1084 }
1085
1086 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1087 {
1088         struct ieee80211_local *local =
1089                 container_of(work, struct ieee80211_local,
1090                              dynamic_ps_enable_work);
1091         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1092         struct ieee80211_if_managed *ifmgd;
1093         unsigned long flags;
1094         int q;
1095
1096         /* can only happen when PS was just disabled anyway */
1097         if (!sdata)
1098                 return;
1099
1100         ifmgd = &sdata->u.mgd;
1101
1102         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1103                 return;
1104
1105         if (!local->disable_dynamic_ps &&
1106             local->hw.conf.dynamic_ps_timeout > 0) {
1107                 /* don't enter PS if TX frames are pending */
1108                 if (drv_tx_frames_pending(local)) {
1109                         mod_timer(&local->dynamic_ps_timer, jiffies +
1110                                   msecs_to_jiffies(
1111                                   local->hw.conf.dynamic_ps_timeout));
1112                         return;
1113                 }
1114
1115                 /*
1116                  * transmission can be stopped by others which leads to
1117                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1118                  * is not the actual idle state.
1119                  */
1120                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1121                 for (q = 0; q < local->hw.queues; q++) {
1122                         if (local->queue_stop_reasons[q]) {
1123                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1124                                                        flags);
1125                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1126                                           msecs_to_jiffies(
1127                                           local->hw.conf.dynamic_ps_timeout));
1128                                 return;
1129                         }
1130                 }
1131                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1132         }
1133
1134         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1135             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1136                 netif_tx_stop_all_queues(sdata->dev);
1137
1138                 if (drv_tx_frames_pending(local))
1139                         mod_timer(&local->dynamic_ps_timer, jiffies +
1140                                   msecs_to_jiffies(
1141                                   local->hw.conf.dynamic_ps_timeout));
1142                 else {
1143                         ieee80211_send_nullfunc(local, sdata, 1);
1144                         /* Flush to get the tx status of nullfunc frame */
1145                         drv_flush(local, false);
1146                 }
1147         }
1148
1149         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1150               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1151             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1152                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1153                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1154                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1155         }
1156
1157         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1158                 netif_tx_wake_all_queues(sdata->dev);
1159 }
1160
1161 void ieee80211_dynamic_ps_timer(unsigned long data)
1162 {
1163         struct ieee80211_local *local = (void *) data;
1164
1165         if (local->quiescing || local->suspended)
1166                 return;
1167
1168         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1169 }
1170
1171 /* MLME */
1172 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
1173                                      struct ieee80211_sub_if_data *sdata,
1174                                      u8 *wmm_param, size_t wmm_param_len)
1175 {
1176         struct ieee80211_tx_queue_params params;
1177         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1178         size_t left;
1179         int count;
1180         u8 *pos, uapsd_queues = 0;
1181
1182         if (!local->ops->conf_tx)
1183                 return;
1184
1185         if (local->hw.queues < 4)
1186                 return;
1187
1188         if (!wmm_param)
1189                 return;
1190
1191         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1192                 return;
1193
1194         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1195                 uapsd_queues = local->uapsd_queues;
1196
1197         count = wmm_param[6] & 0x0f;
1198         if (count == ifmgd->wmm_last_param_set)
1199                 return;
1200         ifmgd->wmm_last_param_set = count;
1201
1202         pos = wmm_param + 8;
1203         left = wmm_param_len - 8;
1204
1205         memset(&params, 0, sizeof(params));
1206
1207         local->wmm_acm = 0;
1208         for (; left >= 4; left -= 4, pos += 4) {
1209                 int aci = (pos[0] >> 5) & 0x03;
1210                 int acm = (pos[0] >> 4) & 0x01;
1211                 bool uapsd = false;
1212                 int queue;
1213
1214                 switch (aci) {
1215                 case 1: /* AC_BK */
1216                         queue = 3;
1217                         if (acm)
1218                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1219                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1220                                 uapsd = true;
1221                         break;
1222                 case 2: /* AC_VI */
1223                         queue = 1;
1224                         if (acm)
1225                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1226                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1227                                 uapsd = true;
1228                         break;
1229                 case 3: /* AC_VO */
1230                         queue = 0;
1231                         if (acm)
1232                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1233                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1234                                 uapsd = true;
1235                         break;
1236                 case 0: /* AC_BE */
1237                 default:
1238                         queue = 2;
1239                         if (acm)
1240                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1241                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1242                                 uapsd = true;
1243                         break;
1244                 }
1245
1246                 params.aifs = pos[0] & 0x0f;
1247                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1248                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1249                 params.txop = get_unaligned_le16(pos + 2);
1250                 params.uapsd = uapsd;
1251
1252 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1253                 wiphy_debug(local->hw.wiphy,
1254                             "WMM queue=%d aci=%d acm=%d aifs=%d "
1255                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1256                             queue, aci, acm,
1257                             params.aifs, params.cw_min, params.cw_max,
1258                             params.txop, params.uapsd);
1259 #endif
1260                 sdata->tx_conf[queue] = params;
1261                 if (drv_conf_tx(local, sdata, queue, &params))
1262                         wiphy_debug(local->hw.wiphy,
1263                                     "failed to set TX queue parameters for queue %d\n",
1264                                     queue);
1265         }
1266
1267         /* enable WMM or activate new settings */
1268         sdata->vif.bss_conf.qos = true;
1269 }
1270
1271 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1272                                            u16 capab, bool erp_valid, u8 erp)
1273 {
1274         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1275         u32 changed = 0;
1276         bool use_protection;
1277         bool use_short_preamble;
1278         bool use_short_slot;
1279
1280         if (erp_valid) {
1281                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1282                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1283         } else {
1284                 use_protection = false;
1285                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1286         }
1287
1288         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1289         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1290                 use_short_slot = true;
1291
1292         if (use_protection != bss_conf->use_cts_prot) {
1293                 bss_conf->use_cts_prot = use_protection;
1294                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1295         }
1296
1297         if (use_short_preamble != bss_conf->use_short_preamble) {
1298                 bss_conf->use_short_preamble = use_short_preamble;
1299                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1300         }
1301
1302         if (use_short_slot != bss_conf->use_short_slot) {
1303                 bss_conf->use_short_slot = use_short_slot;
1304                 changed |= BSS_CHANGED_ERP_SLOT;
1305         }
1306
1307         return changed;
1308 }
1309
1310 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1311                                      struct cfg80211_bss *cbss,
1312                                      u32 bss_info_changed)
1313 {
1314         struct ieee80211_bss *bss = (void *)cbss->priv;
1315         struct ieee80211_local *local = sdata->local;
1316         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1317
1318         bss_info_changed |= BSS_CHANGED_ASSOC;
1319         /* set timing information */
1320         bss_conf->beacon_int = cbss->beacon_interval;
1321         bss_conf->timestamp = cbss->tsf;
1322
1323         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1324         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1325                 cbss->capability, bss->has_erp_value, bss->erp_value);
1326
1327         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1328                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1329
1330         sdata->u.mgd.associated = cbss;
1331         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1332
1333         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1334
1335         /* just to be sure */
1336         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1337                                 IEEE80211_STA_BEACON_POLL);
1338
1339         ieee80211_led_assoc(local, 1);
1340
1341         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1342                 bss_conf->dtim_period = bss->dtim_period;
1343         else
1344                 bss_conf->dtim_period = 0;
1345
1346         bss_conf->assoc = 1;
1347         /*
1348          * For now just always ask the driver to update the basic rateset
1349          * when we have associated, we aren't checking whether it actually
1350          * changed or not.
1351          */
1352         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1353
1354         /* Tell the driver to monitor connection quality (if supported) */
1355         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1356             bss_conf->cqm_rssi_thold)
1357                 bss_info_changed |= BSS_CHANGED_CQM;
1358
1359         /* Enable ARP filtering */
1360         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1361                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1362                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1363         }
1364
1365         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1366
1367         mutex_lock(&local->iflist_mtx);
1368         ieee80211_recalc_ps(local, -1);
1369         ieee80211_recalc_smps(local);
1370         mutex_unlock(&local->iflist_mtx);
1371
1372         netif_tx_start_all_queues(sdata->dev);
1373         netif_carrier_on(sdata->dev);
1374 }
1375
1376 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1377                                    u16 stype, u16 reason, bool tx,
1378                                    u8 *frame_buf)
1379 {
1380         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1381         struct ieee80211_local *local = sdata->local;
1382         struct sta_info *sta;
1383         u32 changed = 0;
1384         u8 bssid[ETH_ALEN];
1385
1386         ASSERT_MGD_MTX(ifmgd);
1387
1388         if (WARN_ON_ONCE(tx && !frame_buf))
1389                 return;
1390
1391         if (WARN_ON(!ifmgd->associated))
1392                 return;
1393
1394         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1395
1396         ifmgd->associated = NULL;
1397         memset(ifmgd->bssid, 0, ETH_ALEN);
1398
1399         /*
1400          * we need to commit the associated = NULL change because the
1401          * scan code uses that to determine whether this iface should
1402          * go to/wake up from powersave or not -- and could otherwise
1403          * wake the queues erroneously.
1404          */
1405         smp_mb();
1406
1407         /*
1408          * Thus, we can only afterwards stop the queues -- to account
1409          * for the case where another CPU is finishing a scan at this
1410          * time -- we don't want the scan code to enable queues.
1411          */
1412
1413         netif_tx_stop_all_queues(sdata->dev);
1414         netif_carrier_off(sdata->dev);
1415
1416         mutex_lock(&local->sta_mtx);
1417         sta = sta_info_get(sdata, bssid);
1418         if (sta) {
1419                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1420                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1421         }
1422         mutex_unlock(&local->sta_mtx);
1423
1424         /* deauthenticate/disassociate now */
1425         if (tx || frame_buf)
1426                 ieee80211_send_deauth_disassoc(sdata, bssid, stype, reason,
1427                                                tx, frame_buf);
1428
1429         /* flush out frame */
1430         if (tx)
1431                 drv_flush(local, false);
1432
1433         /* remove AP and TDLS peers */
1434         sta_info_flush(local, sdata);
1435
1436         /* finally reset all BSS / config parameters */
1437         changed |= ieee80211_reset_erp_info(sdata);
1438
1439         ieee80211_led_assoc(local, 0);
1440         changed |= BSS_CHANGED_ASSOC;
1441         sdata->vif.bss_conf.assoc = false;
1442
1443         /* on the next assoc, re-program HT parameters */
1444         sdata->ht_opmode_valid = false;
1445         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1446         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1447
1448         local->power_constr_level = 0;
1449
1450         del_timer_sync(&local->dynamic_ps_timer);
1451         cancel_work_sync(&local->dynamic_ps_enable_work);
1452
1453         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1454                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1455                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1456         }
1457         local->ps_sdata = NULL;
1458
1459         /* Disable ARP filtering */
1460         if (sdata->vif.bss_conf.arp_filter_enabled) {
1461                 sdata->vif.bss_conf.arp_filter_enabled = false;
1462                 changed |= BSS_CHANGED_ARP_FILTER;
1463         }
1464
1465         sdata->vif.bss_conf.qos = false;
1466         changed |= BSS_CHANGED_QOS;
1467
1468         /* The BSSID (not really interesting) and HT changed */
1469         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1470         ieee80211_bss_info_change_notify(sdata, changed);
1471
1472         /* channel(_type) changes are handled by ieee80211_hw_config */
1473         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1474         ieee80211_hw_config(local, 0);
1475
1476         /* disassociated - set to defaults now */
1477         ieee80211_set_wmm_default(sdata, false);
1478
1479         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1480         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1481         del_timer_sync(&sdata->u.mgd.timer);
1482         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1483 }
1484
1485 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1486                              struct ieee80211_hdr *hdr)
1487 {
1488         /*
1489          * We can postpone the mgd.timer whenever receiving unicast frames
1490          * from AP because we know that the connection is working both ways
1491          * at that time. But multicast frames (and hence also beacons) must
1492          * be ignored here, because we need to trigger the timer during
1493          * data idle periods for sending the periodic probe request to the
1494          * AP we're connected to.
1495          */
1496         if (is_multicast_ether_addr(hdr->addr1))
1497                 return;
1498
1499         ieee80211_sta_reset_conn_monitor(sdata);
1500 }
1501
1502 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1503 {
1504         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1505
1506         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1507                               IEEE80211_STA_CONNECTION_POLL)))
1508             return;
1509
1510         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1511                           IEEE80211_STA_BEACON_POLL);
1512         mutex_lock(&sdata->local->iflist_mtx);
1513         ieee80211_recalc_ps(sdata->local, -1);
1514         mutex_unlock(&sdata->local->iflist_mtx);
1515
1516         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1517                 return;
1518
1519         /*
1520          * We've received a probe response, but are not sure whether
1521          * we have or will be receiving any beacons or data, so let's
1522          * schedule the timers again, just in case.
1523          */
1524         ieee80211_sta_reset_beacon_monitor(sdata);
1525
1526         mod_timer(&ifmgd->conn_mon_timer,
1527                   round_jiffies_up(jiffies +
1528                                    IEEE80211_CONNECTION_IDLE_TIME));
1529 }
1530
1531 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1532                              struct ieee80211_hdr *hdr, bool ack)
1533 {
1534         if (!ieee80211_is_data(hdr->frame_control))
1535             return;
1536
1537         if (ack)
1538                 ieee80211_sta_reset_conn_monitor(sdata);
1539
1540         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1541             sdata->u.mgd.probe_send_count > 0) {
1542                 if (ack)
1543                         sdata->u.mgd.probe_send_count = 0;
1544                 else
1545                         sdata->u.mgd.nullfunc_failed = true;
1546                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1547         }
1548 }
1549
1550 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1551 {
1552         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1553         const u8 *ssid;
1554         u8 *dst = ifmgd->associated->bssid;
1555         u8 unicast_limit = max(1, max_probe_tries - 3);
1556
1557         /*
1558          * Try sending broadcast probe requests for the last three
1559          * probe requests after the first ones failed since some
1560          * buggy APs only support broadcast probe requests.
1561          */
1562         if (ifmgd->probe_send_count >= unicast_limit)
1563                 dst = NULL;
1564
1565         /*
1566          * When the hardware reports an accurate Tx ACK status, it's
1567          * better to send a nullfunc frame instead of a probe request,
1568          * as it will kick us off the AP quickly if we aren't associated
1569          * anymore. The timeout will be reset if the frame is ACKed by
1570          * the AP.
1571          */
1572         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1573                 ifmgd->nullfunc_failed = false;
1574                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1575         } else {
1576                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1577                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1578                                          (u32) -1, true, false);
1579         }
1580
1581         ifmgd->probe_send_count++;
1582         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1583         run_again(ifmgd, ifmgd->probe_timeout);
1584 }
1585
1586 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1587                                    bool beacon)
1588 {
1589         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1590         bool already = false;
1591
1592         if (!ieee80211_sdata_running(sdata))
1593                 return;
1594
1595         if (sdata->local->scanning)
1596                 return;
1597
1598         if (sdata->local->tmp_channel)
1599                 return;
1600
1601         mutex_lock(&ifmgd->mtx);
1602
1603         if (!ifmgd->associated)
1604                 goto out;
1605
1606 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1607         if (beacon && net_ratelimit())
1608                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1609                        "- sending probe request\n", sdata->name);
1610 #endif
1611
1612         /*
1613          * The driver/our work has already reported this event or the
1614          * connection monitoring has kicked in and we have already sent
1615          * a probe request. Or maybe the AP died and the driver keeps
1616          * reporting until we disassociate...
1617          *
1618          * In either case we have to ignore the current call to this
1619          * function (except for setting the correct probe reason bit)
1620          * because otherwise we would reset the timer every time and
1621          * never check whether we received a probe response!
1622          */
1623         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1624                             IEEE80211_STA_CONNECTION_POLL))
1625                 already = true;
1626
1627         if (beacon)
1628                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1629         else
1630                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1631
1632         if (already)
1633                 goto out;
1634
1635         mutex_lock(&sdata->local->iflist_mtx);
1636         ieee80211_recalc_ps(sdata->local, -1);
1637         mutex_unlock(&sdata->local->iflist_mtx);
1638
1639         ifmgd->probe_send_count = 0;
1640         ieee80211_mgd_probe_ap_send(sdata);
1641  out:
1642         mutex_unlock(&ifmgd->mtx);
1643 }
1644
1645 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1646                                           struct ieee80211_vif *vif)
1647 {
1648         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1649         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1650         struct sk_buff *skb;
1651         const u8 *ssid;
1652
1653         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1654                 return NULL;
1655
1656         ASSERT_MGD_MTX(ifmgd);
1657
1658         if (!ifmgd->associated)
1659                 return NULL;
1660
1661         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1662         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1663                                         (u32) -1, ssid + 2, ssid[1],
1664                                         NULL, 0, true);
1665
1666         return skb;
1667 }
1668 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1669
1670 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1671 {
1672         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1673         struct ieee80211_local *local = sdata->local;
1674         u8 bssid[ETH_ALEN];
1675         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1676
1677         mutex_lock(&ifmgd->mtx);
1678         if (!ifmgd->associated) {
1679                 mutex_unlock(&ifmgd->mtx);
1680                 return;
1681         }
1682
1683         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1684
1685         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1686                sdata->name, bssid);
1687
1688         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1689                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1690                                false, frame_buf);
1691         mutex_unlock(&ifmgd->mtx);
1692
1693         /*
1694          * must be outside lock due to cfg80211,
1695          * but that's not a problem.
1696          */
1697         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1698
1699         mutex_lock(&local->mtx);
1700         ieee80211_recalc_idle(local);
1701         mutex_unlock(&local->mtx);
1702 }
1703
1704 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1705 {
1706         struct ieee80211_sub_if_data *sdata =
1707                 container_of(work, struct ieee80211_sub_if_data,
1708                              u.mgd.beacon_connection_loss_work);
1709         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1710         struct sta_info *sta;
1711
1712         if (ifmgd->associated) {
1713                 rcu_read_lock();
1714                 sta = sta_info_get(sdata, ifmgd->bssid);
1715                 if (sta)
1716                         sta->beacon_loss_count++;
1717                 rcu_read_unlock();
1718         }
1719
1720         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1721                 __ieee80211_connection_loss(sdata);
1722         else
1723                 ieee80211_mgd_probe_ap(sdata, true);
1724 }
1725
1726 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1727 {
1728         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1729         struct ieee80211_hw *hw = &sdata->local->hw;
1730
1731         trace_api_beacon_loss(sdata);
1732
1733         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1734         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1735 }
1736 EXPORT_SYMBOL(ieee80211_beacon_loss);
1737
1738 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1739 {
1740         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1741         struct ieee80211_hw *hw = &sdata->local->hw;
1742
1743         trace_api_connection_loss(sdata);
1744
1745         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1746         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1747 }
1748 EXPORT_SYMBOL(ieee80211_connection_loss);
1749
1750
1751 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1752                                         bool assoc)
1753 {
1754         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1755
1756         lockdep_assert_held(&sdata->u.mgd.mtx);
1757
1758         if (!assoc) {
1759                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1760
1761                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1762                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1763         }
1764
1765         cfg80211_put_bss(auth_data->bss);
1766         kfree(auth_data);
1767         sdata->u.mgd.auth_data = NULL;
1768 }
1769
1770 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1771                                      struct ieee80211_mgmt *mgmt, size_t len)
1772 {
1773         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1774         u8 *pos;
1775         struct ieee802_11_elems elems;
1776
1777         pos = mgmt->u.auth.variable;
1778         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1779         if (!elems.challenge)
1780                 return;
1781         auth_data->expected_transaction = 4;
1782         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1783                             elems.challenge - 2, elems.challenge_len + 2,
1784                             auth_data->bss->bssid, auth_data->bss->bssid,
1785                             auth_data->key, auth_data->key_len,
1786                             auth_data->key_idx);
1787 }
1788
1789 static enum rx_mgmt_action __must_check
1790 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1791                        struct ieee80211_mgmt *mgmt, size_t len)
1792 {
1793         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1794         u8 bssid[ETH_ALEN];
1795         u16 auth_alg, auth_transaction, status_code;
1796         struct sta_info *sta;
1797
1798         lockdep_assert_held(&ifmgd->mtx);
1799
1800         if (len < 24 + 6)
1801                 return RX_MGMT_NONE;
1802
1803         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1804                 return RX_MGMT_NONE;
1805
1806         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1807
1808         if (compare_ether_addr(bssid, mgmt->bssid))
1809                 return RX_MGMT_NONE;
1810
1811         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1812         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1813         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1814
1815         if (auth_alg != ifmgd->auth_data->algorithm ||
1816             auth_transaction != ifmgd->auth_data->expected_transaction)
1817                 return RX_MGMT_NONE;
1818
1819         if (status_code != WLAN_STATUS_SUCCESS) {
1820                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
1821                        sdata->name, mgmt->sa, status_code);
1822                 goto out;
1823         }
1824
1825         switch (ifmgd->auth_data->algorithm) {
1826         case WLAN_AUTH_OPEN:
1827         case WLAN_AUTH_LEAP:
1828         case WLAN_AUTH_FT:
1829                 break;
1830         case WLAN_AUTH_SHARED_KEY:
1831                 if (ifmgd->auth_data->expected_transaction != 4) {
1832                         ieee80211_auth_challenge(sdata, mgmt, len);
1833                         /* need another frame */
1834                         return RX_MGMT_NONE;
1835                 }
1836                 break;
1837         default:
1838                 WARN_ONCE(1, "invalid auth alg %d",
1839                           ifmgd->auth_data->algorithm);
1840                 return RX_MGMT_NONE;
1841         }
1842
1843         printk(KERN_DEBUG "%s: authenticated\n", sdata->name);
1844  out:
1845         ifmgd->auth_data->done = true;
1846         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1847         run_again(ifmgd, ifmgd->auth_data->timeout);
1848
1849         /* move station state to auth */
1850         mutex_lock(&sdata->local->sta_mtx);
1851         sta = sta_info_get(sdata, bssid);
1852         if (!sta) {
1853                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1854                 goto out_err;
1855         }
1856         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1857                 printk(KERN_DEBUG "%s: failed moving %pM to auth\n",
1858                        sdata->name, bssid);
1859                 goto out_err;
1860         }
1861         mutex_unlock(&sdata->local->sta_mtx);
1862
1863         return RX_MGMT_CFG80211_RX_AUTH;
1864  out_err:
1865         mutex_unlock(&sdata->local->sta_mtx);
1866         /* ignore frame -- wait for timeout */
1867         return RX_MGMT_NONE;
1868 }
1869
1870
1871 static enum rx_mgmt_action __must_check
1872 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1873                          struct ieee80211_mgmt *mgmt, size_t len)
1874 {
1875         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1876         const u8 *bssid = NULL;
1877         u16 reason_code;
1878
1879         lockdep_assert_held(&ifmgd->mtx);
1880
1881         if (len < 24 + 2)
1882                 return RX_MGMT_NONE;
1883
1884         if (!ifmgd->associated ||
1885             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
1886                 return RX_MGMT_NONE;
1887
1888         bssid = ifmgd->associated->bssid;
1889
1890         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1891
1892         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1893                         sdata->name, bssid, reason_code);
1894
1895         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1896
1897         mutex_lock(&sdata->local->mtx);
1898         ieee80211_recalc_idle(sdata->local);
1899         mutex_unlock(&sdata->local->mtx);
1900
1901         return RX_MGMT_CFG80211_DEAUTH;
1902 }
1903
1904
1905 static enum rx_mgmt_action __must_check
1906 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1907                            struct ieee80211_mgmt *mgmt, size_t len)
1908 {
1909         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1910         u16 reason_code;
1911
1912         lockdep_assert_held(&ifmgd->mtx);
1913
1914         if (len < 24 + 2)
1915                 return RX_MGMT_NONE;
1916
1917         if (!ifmgd->associated ||
1918             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
1919                 return RX_MGMT_NONE;
1920
1921         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1922
1923         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1924                         sdata->name, mgmt->sa, reason_code);
1925
1926         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1927
1928         mutex_lock(&sdata->local->mtx);
1929         ieee80211_recalc_idle(sdata->local);
1930         mutex_unlock(&sdata->local->mtx);
1931
1932         return RX_MGMT_CFG80211_DISASSOC;
1933 }
1934
1935 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1936                                 u8 *supp_rates, unsigned int supp_rates_len,
1937                                 u32 *rates, u32 *basic_rates,
1938                                 bool *have_higher_than_11mbit,
1939                                 int *min_rate, int *min_rate_index)
1940 {
1941         int i, j;
1942
1943         for (i = 0; i < supp_rates_len; i++) {
1944                 int rate = (supp_rates[i] & 0x7f) * 5;
1945                 bool is_basic = !!(supp_rates[i] & 0x80);
1946
1947                 if (rate > 110)
1948                         *have_higher_than_11mbit = true;
1949
1950                 /*
1951                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1952                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1953                  *
1954                  * Note: Even through the membership selector and the basic
1955                  *       rate flag share the same bit, they are not exactly
1956                  *       the same.
1957                  */
1958                 if (!!(supp_rates[i] & 0x80) &&
1959                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1960                         continue;
1961
1962                 for (j = 0; j < sband->n_bitrates; j++) {
1963                         if (sband->bitrates[j].bitrate == rate) {
1964                                 *rates |= BIT(j);
1965                                 if (is_basic)
1966                                         *basic_rates |= BIT(j);
1967                                 if (rate < *min_rate) {
1968                                         *min_rate = rate;
1969                                         *min_rate_index = j;
1970                                 }
1971                                 break;
1972                         }
1973                 }
1974         }
1975 }
1976
1977 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1978                                          bool assoc)
1979 {
1980         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1981
1982         lockdep_assert_held(&sdata->u.mgd.mtx);
1983
1984         if (!assoc) {
1985                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1986
1987                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1988                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1989         }
1990
1991         kfree(assoc_data);
1992         sdata->u.mgd.assoc_data = NULL;
1993 }
1994
1995 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
1996                                     struct cfg80211_bss *cbss,
1997                                     struct ieee80211_mgmt *mgmt, size_t len)
1998 {
1999         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2000         struct ieee80211_local *local = sdata->local;
2001         struct ieee80211_supported_band *sband;
2002         struct sta_info *sta;
2003         u8 *pos;
2004         u32 rates, basic_rates;
2005         u16 capab_info, aid;
2006         struct ieee802_11_elems elems;
2007         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2008         u32 changed = 0;
2009         int err;
2010         bool have_higher_than_11mbit = false;
2011         u16 ap_ht_cap_flags;
2012         int min_rate = INT_MAX, min_rate_index = -1;
2013
2014         /* AssocResp and ReassocResp have identical structure */
2015
2016         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2017         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2018
2019         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2020                 printk(KERN_DEBUG
2021                        "%s: invalid AID value 0x%x; bits 15:14 not set\n",
2022                        sdata->name, aid);
2023         aid &= ~(BIT(15) | BIT(14));
2024
2025         ifmgd->broken_ap = false;
2026
2027         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2028                 printk(KERN_DEBUG
2029                        "%s: invalid AID value %d (out of range), turn off PS\n",
2030                        sdata->name, aid);
2031                 aid = 0;
2032                 ifmgd->broken_ap = true;
2033         }
2034
2035         pos = mgmt->u.assoc_resp.variable;
2036         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2037
2038         if (!elems.supp_rates) {
2039                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2040                        sdata->name);
2041                 return false;
2042         }
2043
2044         ifmgd->aid = aid;
2045
2046         mutex_lock(&sdata->local->sta_mtx);
2047         /*
2048          * station info was already allocated and inserted before
2049          * the association and should be available to us
2050          */
2051         sta = sta_info_get(sdata, cbss->bssid);
2052         if (WARN_ON(!sta)) {
2053                 mutex_unlock(&sdata->local->sta_mtx);
2054                 return false;
2055         }
2056
2057         rates = 0;
2058         basic_rates = 0;
2059         sband = local->hw.wiphy->bands[local->oper_channel->band];
2060
2061         ieee80211_get_rates(sband, elems.supp_rates, elems.supp_rates_len,
2062                             &rates, &basic_rates, &have_higher_than_11mbit,
2063                             &min_rate, &min_rate_index);
2064
2065         ieee80211_get_rates(sband, elems.ext_supp_rates,
2066                             elems.ext_supp_rates_len, &rates, &basic_rates,
2067                             &have_higher_than_11mbit,
2068                             &min_rate, &min_rate_index);
2069
2070         /*
2071          * some buggy APs don't advertise basic_rates. use the lowest
2072          * supported rate instead.
2073          */
2074         if (unlikely(!basic_rates) && min_rate_index >= 0) {
2075                 printk(KERN_DEBUG "%s: No basic rates in AssocResp. "
2076                        "Using min supported rate instead.\n", sdata->name);
2077                 basic_rates = BIT(min_rate_index);
2078         }
2079
2080         sta->sta.supp_rates[local->oper_channel->band] = rates;
2081         sdata->vif.bss_conf.basic_rates = basic_rates;
2082
2083         /* cf. IEEE 802.11 9.2.12 */
2084         if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
2085             have_higher_than_11mbit)
2086                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
2087         else
2088                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
2089
2090         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2091                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2092                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2093
2094         ap_ht_cap_flags = sta->sta.ht_cap.cap;
2095
2096         rate_control_rate_init(sta);
2097
2098         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2099                 set_sta_flag(sta, WLAN_STA_MFP);
2100
2101         if (elems.wmm_param)
2102                 set_sta_flag(sta, WLAN_STA_WME);
2103
2104         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2105         if (!err)
2106                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2107         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2108                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2109         if (err) {
2110                 printk(KERN_DEBUG
2111                        "%s: failed to move station %pM to desired state\n",
2112                        sdata->name, sta->sta.addr);
2113                 WARN_ON(__sta_info_destroy(sta));
2114                 mutex_unlock(&sdata->local->sta_mtx);
2115                 return false;
2116         }
2117
2118         mutex_unlock(&sdata->local->sta_mtx);
2119
2120         /*
2121          * Always handle WMM once after association regardless
2122          * of the first value the AP uses. Setting -1 here has
2123          * that effect because the AP values is an unsigned
2124          * 4-bit value.
2125          */
2126         ifmgd->wmm_last_param_set = -1;
2127
2128         if (elems.wmm_param)
2129                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2130                                          elems.wmm_param_len);
2131         else
2132                 ieee80211_set_wmm_default(sdata, false);
2133         changed |= BSS_CHANGED_QOS;
2134
2135         if (elems.ht_info_elem && elems.wmm_param &&
2136             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2137                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2138                                                cbss->bssid, ap_ht_cap_flags,
2139                                                false);
2140
2141         /* set AID and assoc capability,
2142          * ieee80211_set_associated() will tell the driver */
2143         bss_conf->aid = aid;
2144         bss_conf->assoc_capability = capab_info;
2145         ieee80211_set_associated(sdata, cbss, changed);
2146
2147         /*
2148          * If we're using 4-addr mode, let the AP know that we're
2149          * doing so, so that it can create the STA VLAN on its side
2150          */
2151         if (ifmgd->use_4addr)
2152                 ieee80211_send_4addr_nullfunc(local, sdata);
2153
2154         /*
2155          * Start timer to probe the connection to the AP now.
2156          * Also start the timer that will detect beacon loss.
2157          */
2158         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2159         ieee80211_sta_reset_beacon_monitor(sdata);
2160
2161         return true;
2162 }
2163
2164 static enum rx_mgmt_action __must_check
2165 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2166                              struct ieee80211_mgmt *mgmt, size_t len,
2167                              struct cfg80211_bss **bss)
2168 {
2169         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2170         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2171         u16 capab_info, status_code, aid;
2172         struct ieee802_11_elems elems;
2173         u8 *pos;
2174         bool reassoc;
2175
2176         lockdep_assert_held(&ifmgd->mtx);
2177
2178         if (!assoc_data)
2179                 return RX_MGMT_NONE;
2180         if (compare_ether_addr(assoc_data->bss->bssid, mgmt->bssid))
2181                 return RX_MGMT_NONE;
2182
2183         /*
2184          * AssocResp and ReassocResp have identical structure, so process both
2185          * of them in this function.
2186          */
2187
2188         if (len < 24 + 6)
2189                 return RX_MGMT_NONE;
2190
2191         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2192         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2193         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2194         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2195
2196         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
2197                "status=%d aid=%d)\n",
2198                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
2199                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2200
2201         pos = mgmt->u.assoc_resp.variable;
2202         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2203
2204         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2205             elems.timeout_int && elems.timeout_int_len == 5 &&
2206             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2207                 u32 tu, ms;
2208                 tu = get_unaligned_le32(elems.timeout_int + 1);
2209                 ms = tu * 1024 / 1000;
2210                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
2211                        "comeback duration %u TU (%u ms)\n",
2212                        sdata->name, mgmt->sa, tu, ms);
2213                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2214                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2215                         run_again(ifmgd, assoc_data->timeout);
2216                 return RX_MGMT_NONE;
2217         }
2218
2219         *bss = assoc_data->bss;
2220
2221         if (status_code != WLAN_STATUS_SUCCESS) {
2222                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
2223                        sdata->name, mgmt->sa, status_code);
2224                 ieee80211_destroy_assoc_data(sdata, false);
2225         } else {
2226                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
2227
2228                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2229                         /* oops -- internal error -- send timeout for now */
2230                         ieee80211_destroy_assoc_data(sdata, true);
2231                         sta_info_destroy_addr(sdata, mgmt->bssid);
2232                         cfg80211_put_bss(*bss);
2233                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2234                 }
2235
2236                 /*
2237                  * destroy assoc_data afterwards, as otherwise an idle
2238                  * recalc after assoc_data is NULL but before associated
2239                  * is set can cause the interface to go idle
2240                  */
2241                 ieee80211_destroy_assoc_data(sdata, true);
2242         }
2243
2244         return RX_MGMT_CFG80211_RX_ASSOC;
2245 }
2246 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2247                                   struct ieee80211_mgmt *mgmt,
2248                                   size_t len,
2249                                   struct ieee80211_rx_status *rx_status,
2250                                   struct ieee802_11_elems *elems,
2251                                   bool beacon)
2252 {
2253         struct ieee80211_local *local = sdata->local;
2254         int freq;
2255         struct ieee80211_bss *bss;
2256         struct ieee80211_channel *channel;
2257         bool need_ps = false;
2258
2259         if (sdata->u.mgd.associated &&
2260             compare_ether_addr(mgmt->bssid, sdata->u.mgd.associated->bssid)
2261             == 0) {
2262                 bss = (void *)sdata->u.mgd.associated->priv;
2263                 /* not previously set so we may need to recalc */
2264                 need_ps = !bss->dtim_period;
2265         }
2266
2267         if (elems->ds_params && elems->ds_params_len == 1)
2268                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2269                                                       rx_status->band);
2270         else
2271                 freq = rx_status->freq;
2272
2273         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2274
2275         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2276                 return;
2277
2278         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2279                                         channel, beacon);
2280         if (bss)
2281                 ieee80211_rx_bss_put(local, bss);
2282
2283         if (!sdata->u.mgd.associated)
2284                 return;
2285
2286         if (need_ps) {
2287                 mutex_lock(&local->iflist_mtx);
2288                 ieee80211_recalc_ps(local, -1);
2289                 mutex_unlock(&local->iflist_mtx);
2290         }
2291
2292         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2293             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2294                                                         ETH_ALEN) == 0)) {
2295                 struct ieee80211_channel_sw_ie *sw_elem =
2296                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2297                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2298                                                  bss, rx_status->mactime);
2299         }
2300 }
2301
2302
2303 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2304                                          struct sk_buff *skb)
2305 {
2306         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2307         struct ieee80211_if_managed *ifmgd;
2308         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2309         size_t baselen, len = skb->len;
2310         struct ieee802_11_elems elems;
2311
2312         ifmgd = &sdata->u.mgd;
2313
2314         ASSERT_MGD_MTX(ifmgd);
2315
2316         if (compare_ether_addr(mgmt->da, sdata->vif.addr))
2317                 return; /* ignore ProbeResp to foreign address */
2318
2319         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2320         if (baselen > len)
2321                 return;
2322
2323         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2324                                 &elems);
2325
2326         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2327
2328         if (ifmgd->associated &&
2329             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid) == 0)
2330                 ieee80211_reset_ap_probe(sdata);
2331
2332         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2333             compare_ether_addr(mgmt->bssid, ifmgd->auth_data->bss->bssid)
2334             == 0) {
2335                 /* got probe response, continue with auth */
2336                 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
2337                 ifmgd->auth_data->tries = 0;
2338                 ifmgd->auth_data->timeout = jiffies;
2339                 run_again(ifmgd, ifmgd->auth_data->timeout);
2340         }
2341 }
2342
2343 /*
2344  * This is the canonical list of information elements we care about,
2345  * the filter code also gives us all changes to the Microsoft OUI
2346  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2347  *
2348  * We implement beacon filtering in software since that means we can
2349  * avoid processing the frame here and in cfg80211, and userspace
2350  * will not be able to tell whether the hardware supports it or not.
2351  *
2352  * XXX: This list needs to be dynamic -- userspace needs to be able to
2353  *      add items it requires. It also needs to be able to tell us to
2354  *      look out for other vendor IEs.
2355  */
2356 static const u64 care_about_ies =
2357         (1ULL << WLAN_EID_COUNTRY) |
2358         (1ULL << WLAN_EID_ERP_INFO) |
2359         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2360         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2361         (1ULL << WLAN_EID_HT_CAPABILITY) |
2362         (1ULL << WLAN_EID_HT_INFORMATION);
2363
2364 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2365                                      struct ieee80211_mgmt *mgmt,
2366                                      size_t len,
2367                                      struct ieee80211_rx_status *rx_status)
2368 {
2369         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2370         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2371         size_t baselen;
2372         struct ieee802_11_elems elems;
2373         struct ieee80211_local *local = sdata->local;
2374         u32 changed = 0;
2375         bool erp_valid, directed_tim = false;
2376         u8 erp_value = 0;
2377         u32 ncrc;
2378         u8 *bssid;
2379
2380         lockdep_assert_held(&ifmgd->mtx);
2381
2382         /* Process beacon from the current BSS */
2383         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2384         if (baselen > len)
2385                 return;
2386
2387         if (rx_status->freq != local->hw.conf.channel->center_freq)
2388                 return;
2389
2390         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2391             compare_ether_addr(mgmt->bssid, ifmgd->assoc_data->bss->bssid)
2392             == 0) {
2393                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2394                                        len - baselen, &elems);
2395
2396                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2397                                       false);
2398                 ifmgd->assoc_data->have_beacon = true;
2399                 ifmgd->assoc_data->sent_assoc = false;
2400                 /* continue assoc process */
2401                 ifmgd->assoc_data->timeout = jiffies;
2402                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2403                 return;
2404         }
2405
2406         if (!ifmgd->associated ||
2407             compare_ether_addr(mgmt->bssid, ifmgd->associated->bssid))
2408                 return;
2409         bssid = ifmgd->associated->bssid;
2410
2411         /* Track average RSSI from the Beacon frames of the current AP */
2412         ifmgd->last_beacon_signal = rx_status->signal;
2413         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2414                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2415                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2416                 ifmgd->last_cqm_event_signal = 0;
2417                 ifmgd->count_beacon_signal = 1;
2418                 ifmgd->last_ave_beacon_signal = 0;
2419         } else {
2420                 ifmgd->ave_beacon_signal =
2421                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2422                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2423                          ifmgd->ave_beacon_signal) / 16;
2424                 ifmgd->count_beacon_signal++;
2425         }
2426
2427         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2428             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2429                 int sig = ifmgd->ave_beacon_signal;
2430                 int last_sig = ifmgd->last_ave_beacon_signal;
2431
2432                 /*
2433                  * if signal crosses either of the boundaries, invoke callback
2434                  * with appropriate parameters
2435                  */
2436                 if (sig > ifmgd->rssi_max_thold &&
2437                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2438                         ifmgd->last_ave_beacon_signal = sig;
2439                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2440                 } else if (sig < ifmgd->rssi_min_thold &&
2441                            (last_sig >= ifmgd->rssi_max_thold ||
2442                            last_sig == 0)) {
2443                         ifmgd->last_ave_beacon_signal = sig;
2444                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2445                 }
2446         }
2447
2448         if (bss_conf->cqm_rssi_thold &&
2449             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2450             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2451                 int sig = ifmgd->ave_beacon_signal / 16;
2452                 int last_event = ifmgd->last_cqm_event_signal;
2453                 int thold = bss_conf->cqm_rssi_thold;
2454                 int hyst = bss_conf->cqm_rssi_hyst;
2455                 if (sig < thold &&
2456                     (last_event == 0 || sig < last_event - hyst)) {
2457                         ifmgd->last_cqm_event_signal = sig;
2458                         ieee80211_cqm_rssi_notify(
2459                                 &sdata->vif,
2460                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2461                                 GFP_KERNEL);
2462                 } else if (sig > thold &&
2463                            (last_event == 0 || sig > last_event + hyst)) {
2464                         ifmgd->last_cqm_event_signal = sig;
2465                         ieee80211_cqm_rssi_notify(
2466                                 &sdata->vif,
2467                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2468                                 GFP_KERNEL);
2469                 }
2470         }
2471
2472         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2473 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2474                 if (net_ratelimit()) {
2475                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
2476                                "to a received beacon\n", sdata->name);
2477                 }
2478 #endif
2479                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2480                 mutex_lock(&local->iflist_mtx);
2481                 ieee80211_recalc_ps(local, -1);
2482                 mutex_unlock(&local->iflist_mtx);
2483         }
2484
2485         /*
2486          * Push the beacon loss detection into the future since
2487          * we are processing a beacon from the AP just now.
2488          */
2489         ieee80211_sta_reset_beacon_monitor(sdata);
2490
2491         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2492         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2493                                           len - baselen, &elems,
2494                                           care_about_ies, ncrc);
2495
2496         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2497                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2498                                                    ifmgd->aid);
2499
2500         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
2501                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2502                                       true);
2503
2504                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2505                                          elems.wmm_param_len);
2506         }
2507
2508         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2509                 if (directed_tim) {
2510                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2511                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2512                                 ieee80211_hw_config(local,
2513                                                     IEEE80211_CONF_CHANGE_PS);
2514                                 ieee80211_send_nullfunc(local, sdata, 0);
2515                         } else {
2516                                 local->pspolling = true;
2517
2518                                 /*
2519                                  * Here is assumed that the driver will be
2520                                  * able to send ps-poll frame and receive a
2521                                  * response even though power save mode is
2522                                  * enabled, but some drivers might require
2523                                  * to disable power save here. This needs
2524                                  * to be investigated.
2525                                  */
2526                                 ieee80211_send_pspoll(local, sdata);
2527                         }
2528                 }
2529         }
2530
2531         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2532                 return;
2533         ifmgd->beacon_crc = ncrc;
2534         ifmgd->beacon_crc_valid = true;
2535
2536         if (elems.erp_info && elems.erp_info_len >= 1) {
2537                 erp_valid = true;
2538                 erp_value = elems.erp_info[0];
2539         } else {
2540                 erp_valid = false;
2541         }
2542         changed |= ieee80211_handle_bss_capability(sdata,
2543                         le16_to_cpu(mgmt->u.beacon.capab_info),
2544                         erp_valid, erp_value);
2545
2546
2547         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
2548             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2549                 struct sta_info *sta;
2550                 struct ieee80211_supported_band *sband;
2551                 u16 ap_ht_cap_flags;
2552
2553                 rcu_read_lock();
2554
2555                 sta = sta_info_get(sdata, bssid);
2556                 if (WARN_ON(!sta)) {
2557                         rcu_read_unlock();
2558                         return;
2559                 }
2560
2561                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2562
2563                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2564                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2565
2566                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
2567
2568                 rcu_read_unlock();
2569
2570                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
2571                                                bssid, ap_ht_cap_flags, true);
2572         }
2573
2574         /* Note: country IE parsing is done for us by cfg80211 */
2575         if (elems.country_elem) {
2576                 /* TODO: IBSS also needs this */
2577                 if (elems.pwr_constr_elem)
2578                         ieee80211_handle_pwr_constr(sdata,
2579                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2580                                 elems.pwr_constr_elem,
2581                                 elems.pwr_constr_elem_len);
2582         }
2583
2584         ieee80211_bss_info_change_notify(sdata, changed);
2585 }
2586
2587 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2588                                   struct sk_buff *skb)
2589 {
2590         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2591         struct ieee80211_rx_status *rx_status;
2592         struct ieee80211_mgmt *mgmt;
2593         struct cfg80211_bss *bss = NULL;
2594         enum rx_mgmt_action rma = RX_MGMT_NONE;
2595         u16 fc;
2596
2597         rx_status = (struct ieee80211_rx_status *) skb->cb;
2598         mgmt = (struct ieee80211_mgmt *) skb->data;
2599         fc = le16_to_cpu(mgmt->frame_control);
2600
2601         mutex_lock(&ifmgd->mtx);
2602
2603         switch (fc & IEEE80211_FCTL_STYPE) {
2604         case IEEE80211_STYPE_BEACON:
2605                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2606                 break;
2607         case IEEE80211_STYPE_PROBE_RESP:
2608                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2609                 break;
2610         case IEEE80211_STYPE_AUTH:
2611                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2612                 break;
2613         case IEEE80211_STYPE_DEAUTH:
2614                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2615                 break;
2616         case IEEE80211_STYPE_DISASSOC:
2617                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2618                 break;
2619         case IEEE80211_STYPE_ASSOC_RESP:
2620         case IEEE80211_STYPE_REASSOC_RESP:
2621                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2622                 break;
2623         case IEEE80211_STYPE_ACTION:
2624                 switch (mgmt->u.action.category) {
2625                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2626                         ieee80211_sta_process_chanswitch(sdata,
2627                                         &mgmt->u.action.u.chan_switch.sw_elem,
2628                                         (void *)ifmgd->associated->priv,
2629                                         rx_status->mactime);
2630                         break;
2631                 }
2632         }
2633         mutex_unlock(&ifmgd->mtx);
2634
2635         switch (rma) {
2636         case RX_MGMT_NONE:
2637                 /* no action */
2638                 break;
2639         case RX_MGMT_CFG80211_DEAUTH:
2640                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2641                 break;
2642         case RX_MGMT_CFG80211_DISASSOC:
2643                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2644                 break;
2645         case RX_MGMT_CFG80211_RX_AUTH:
2646                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2647                 break;
2648         case RX_MGMT_CFG80211_RX_ASSOC:
2649                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2650                 break;
2651         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2652                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2653                 break;
2654         default:
2655                 WARN(1, "unexpected: %d", rma);
2656         }
2657 }
2658
2659 static void ieee80211_sta_timer(unsigned long data)
2660 {
2661         struct ieee80211_sub_if_data *sdata =
2662                 (struct ieee80211_sub_if_data *) data;
2663         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2664         struct ieee80211_local *local = sdata->local;
2665
2666         if (local->quiescing) {
2667                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2668                 return;
2669         }
2670
2671         ieee80211_queue_work(&local->hw, &sdata->work);
2672 }
2673
2674 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2675                                           u8 *bssid, u8 reason)
2676 {
2677         struct ieee80211_local *local = sdata->local;
2678         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2679         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2680
2681         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2682                           IEEE80211_STA_BEACON_POLL);
2683
2684         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2685                                false, frame_buf);
2686         mutex_unlock(&ifmgd->mtx);
2687
2688         /*
2689          * must be outside lock due to cfg80211,
2690          * but that's not a problem.
2691          */
2692         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2693
2694         mutex_lock(&local->mtx);
2695         ieee80211_recalc_idle(local);
2696         mutex_unlock(&local->mtx);
2697
2698         mutex_lock(&ifmgd->mtx);
2699 }
2700
2701 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2702 {
2703         struct ieee80211_local *local = sdata->local;
2704         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2705         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2706
2707         lockdep_assert_held(&ifmgd->mtx);
2708
2709         if (WARN_ON_ONCE(!auth_data))
2710                 return -EINVAL;
2711
2712         auth_data->tries++;
2713
2714         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2715                 printk(KERN_DEBUG "%s: authentication with %pM timed out\n",
2716                        sdata->name, auth_data->bss->bssid);
2717
2718                 /*
2719                  * Most likely AP is not in the range so remove the
2720                  * bss struct for that AP.
2721                  */
2722                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2723
2724                 return -ETIMEDOUT;
2725         }
2726
2727         if (auth_data->bss->proberesp_ies) {
2728                 printk(KERN_DEBUG "%s: send auth to %pM (try %d/%d)\n",
2729                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2730                        IEEE80211_AUTH_MAX_TRIES);
2731
2732                 auth_data->expected_transaction = 2;
2733                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2734                                     auth_data->ie, auth_data->ie_len,
2735                                     auth_data->bss->bssid,
2736                                     auth_data->bss->bssid, NULL, 0, 0);
2737         } else {
2738                 const u8 *ssidie;
2739
2740                 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
2741                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2742                        IEEE80211_AUTH_MAX_TRIES);
2743
2744                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2745                 if (!ssidie)
2746                         return -EINVAL;
2747                 /*
2748                  * Direct probe is sent to broadcast address as some APs
2749                  * will not answer to direct packet in unassociated state.
2750                  */
2751                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2752                                          NULL, 0, (u32) -1, true, false);
2753         }
2754
2755         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2756         run_again(ifmgd, auth_data->timeout);
2757
2758         return 0;
2759 }
2760
2761 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2762 {
2763         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2764         struct ieee80211_local *local = sdata->local;
2765
2766         lockdep_assert_held(&sdata->u.mgd.mtx);
2767
2768         assoc_data->tries++;
2769         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2770                 printk(KERN_DEBUG "%s: association with %pM timed out\n",
2771                        sdata->name, assoc_data->bss->bssid);
2772
2773                 /*
2774                  * Most likely AP is not in the range so remove the
2775                  * bss struct for that AP.
2776                  */
2777                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2778
2779                 return -ETIMEDOUT;
2780         }
2781
2782         printk(KERN_DEBUG "%s: associate with %pM (try %d/%d)\n",
2783                sdata->name, assoc_data->bss->bssid, assoc_data->tries,
2784                IEEE80211_ASSOC_MAX_TRIES);
2785         ieee80211_send_assoc(sdata);
2786
2787         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2788         run_again(&sdata->u.mgd, assoc_data->timeout);
2789
2790         return 0;
2791 }
2792
2793 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2794 {
2795         struct ieee80211_local *local = sdata->local;
2796         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2797
2798         mutex_lock(&ifmgd->mtx);
2799
2800         if (ifmgd->auth_data &&
2801             time_after(jiffies, ifmgd->auth_data->timeout)) {
2802                 if (ifmgd->auth_data->done) {
2803                         /*
2804                          * ok ... we waited for assoc but userspace didn't,
2805                          * so let's just kill the auth data
2806                          */
2807                         ieee80211_destroy_auth_data(sdata, false);
2808                 } else if (ieee80211_probe_auth(sdata)) {
2809                         u8 bssid[ETH_ALEN];
2810
2811                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2812
2813                         ieee80211_destroy_auth_data(sdata, false);
2814
2815                         mutex_unlock(&ifmgd->mtx);
2816                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2817                         mutex_lock(&ifmgd->mtx);
2818                 }
2819         } else if (ifmgd->auth_data)
2820                 run_again(ifmgd, ifmgd->auth_data->timeout);
2821
2822         if (ifmgd->assoc_data &&
2823             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2824                 if (!ifmgd->assoc_data->have_beacon ||
2825                     ieee80211_do_assoc(sdata)) {
2826                         u8 bssid[ETH_ALEN];
2827
2828                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2829
2830                         ieee80211_destroy_assoc_data(sdata, false);
2831
2832                         mutex_unlock(&ifmgd->mtx);
2833                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2834                         mutex_lock(&ifmgd->mtx);
2835                 }
2836         } else if (ifmgd->assoc_data)
2837                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2838
2839         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2840                             IEEE80211_STA_CONNECTION_POLL) &&
2841             ifmgd->associated) {
2842                 u8 bssid[ETH_ALEN];
2843                 int max_tries;
2844
2845                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2846
2847                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2848                         max_tries = max_nullfunc_tries;
2849                 else
2850                         max_tries = max_probe_tries;
2851
2852                 /* ACK received for nullfunc probing frame */
2853                 if (!ifmgd->probe_send_count)
2854                         ieee80211_reset_ap_probe(sdata);
2855                 else if (ifmgd->nullfunc_failed) {
2856                         if (ifmgd->probe_send_count < max_tries) {
2857 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2858                                 wiphy_debug(local->hw.wiphy,
2859                                             "%s: No ack for nullfunc frame to"
2860                                             " AP %pM, try %d/%i\n",
2861                                             sdata->name, bssid,
2862                                             ifmgd->probe_send_count, max_tries);
2863 #endif
2864                                 ieee80211_mgd_probe_ap_send(sdata);
2865                         } else {
2866 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2867                                 wiphy_debug(local->hw.wiphy,
2868                                             "%s: No ack for nullfunc frame to"
2869                                             " AP %pM, disconnecting.\n",
2870                                             sdata->name, bssid);
2871 #endif
2872                                 ieee80211_sta_connection_lost(sdata, bssid,
2873                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2874                         }
2875                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2876                         run_again(ifmgd, ifmgd->probe_timeout);
2877                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2878 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2879                         wiphy_debug(local->hw.wiphy,
2880                                     "%s: Failed to send nullfunc to AP %pM"
2881                                     " after %dms, disconnecting.\n",
2882                                     sdata->name,
2883                                     bssid, probe_wait_ms);
2884 #endif
2885                         ieee80211_sta_connection_lost(sdata, bssid,
2886                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2887                 } else if (ifmgd->probe_send_count < max_tries) {
2888 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2889                         wiphy_debug(local->hw.wiphy,
2890                                     "%s: No probe response from AP %pM"
2891                                     " after %dms, try %d/%i\n",
2892                                     sdata->name,
2893                                     bssid, probe_wait_ms,
2894                                     ifmgd->probe_send_count, max_tries);
2895 #endif
2896                         ieee80211_mgd_probe_ap_send(sdata);
2897                 } else {
2898                         /*
2899                          * We actually lost the connection ... or did we?
2900                          * Let's make sure!
2901                          */
2902                         wiphy_debug(local->hw.wiphy,
2903                                     "%s: No probe response from AP %pM"
2904                                     " after %dms, disconnecting.\n",
2905                                     sdata->name,
2906                                     bssid, probe_wait_ms);
2907
2908                         ieee80211_sta_connection_lost(sdata, bssid,
2909                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2910                 }
2911         }
2912
2913         mutex_unlock(&ifmgd->mtx);
2914
2915         mutex_lock(&local->mtx);
2916         ieee80211_recalc_idle(local);
2917         mutex_unlock(&local->mtx);
2918 }
2919
2920 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2921 {
2922         struct ieee80211_sub_if_data *sdata =
2923                 (struct ieee80211_sub_if_data *) data;
2924         struct ieee80211_local *local = sdata->local;
2925
2926         if (local->quiescing)
2927                 return;
2928
2929         ieee80211_queue_work(&sdata->local->hw,
2930                              &sdata->u.mgd.beacon_connection_loss_work);
2931 }
2932
2933 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2934 {
2935         struct ieee80211_sub_if_data *sdata =
2936                 (struct ieee80211_sub_if_data *) data;
2937         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2938         struct ieee80211_local *local = sdata->local;
2939
2940         if (local->quiescing)
2941                 return;
2942
2943         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2944 }
2945
2946 static void ieee80211_sta_monitor_work(struct work_struct *work)
2947 {
2948         struct ieee80211_sub_if_data *sdata =
2949                 container_of(work, struct ieee80211_sub_if_data,
2950                              u.mgd.monitor_work);
2951
2952         ieee80211_mgd_probe_ap(sdata, false);
2953 }
2954
2955 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2956 {
2957         u32 flags;
2958
2959         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2960                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2961                                         IEEE80211_STA_CONNECTION_POLL);
2962
2963                 /* let's probe the connection once */
2964                 flags = sdata->local->hw.flags;
2965                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2966                         ieee80211_queue_work(&sdata->local->hw,
2967                                              &sdata->u.mgd.monitor_work);
2968                 /* and do all the other regular work too */
2969                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2970         }
2971 }
2972
2973 #ifdef CONFIG_PM
2974 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2975 {
2976         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2977
2978         /*
2979          * we need to use atomic bitops for the running bits
2980          * only because both timers might fire at the same
2981          * time -- the code here is properly synchronised.
2982          */
2983
2984         cancel_work_sync(&ifmgd->request_smps_work);
2985
2986         cancel_work_sync(&ifmgd->monitor_work);
2987         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2988         if (del_timer_sync(&ifmgd->timer))
2989                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2990
2991         cancel_work_sync(&ifmgd->chswitch_work);
2992         if (del_timer_sync(&ifmgd->chswitch_timer))
2993                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2994
2995         /* these will just be re-established on connection */
2996         del_timer_sync(&ifmgd->conn_mon_timer);
2997         del_timer_sync(&ifmgd->bcn_mon_timer);
2998 }
2999
3000 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
3001 {
3002         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3003
3004         if (!ifmgd->associated)
3005                 return;
3006
3007         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
3008                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
3009                 mutex_lock(&ifmgd->mtx);
3010                 if (ifmgd->associated) {
3011 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
3012                         wiphy_debug(sdata->local->hw.wiphy,
3013                                     "%s: driver requested disconnect after resume.\n",
3014                                     sdata->name);
3015 #endif
3016                         ieee80211_sta_connection_lost(sdata,
3017                                 ifmgd->associated->bssid,
3018                                 WLAN_REASON_UNSPECIFIED);
3019                         mutex_unlock(&ifmgd->mtx);
3020                         return;
3021                 }
3022                 mutex_unlock(&ifmgd->mtx);
3023         }
3024
3025         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
3026                 add_timer(&ifmgd->timer);
3027         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
3028                 add_timer(&ifmgd->chswitch_timer);
3029         ieee80211_sta_reset_beacon_monitor(sdata);
3030         ieee80211_restart_sta_timer(sdata);
3031 }
3032 #endif
3033
3034 /* interface setup */
3035 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3036 {
3037         struct ieee80211_if_managed *ifmgd;
3038
3039         ifmgd = &sdata->u.mgd;
3040         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3041         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3042         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3043                   ieee80211_beacon_connection_loss_work);
3044         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3045         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3046                     (unsigned long) sdata);
3047         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3048                     (unsigned long) sdata);
3049         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3050                     (unsigned long) sdata);
3051         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3052                     (unsigned long) sdata);
3053
3054         ifmgd->flags = 0;
3055         ifmgd->powersave = sdata->wdev.ps;
3056
3057         mutex_init(&ifmgd->mtx);
3058
3059         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3060                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3061         else
3062                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3063 }
3064
3065 /* scan finished notification */
3066 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3067 {
3068         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
3069
3070         /* Restart STA timers */
3071         rcu_read_lock();
3072         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3073                 ieee80211_restart_sta_timer(sdata);
3074         rcu_read_unlock();
3075 }
3076
3077 int ieee80211_max_network_latency(struct notifier_block *nb,
3078                                   unsigned long data, void *dummy)
3079 {
3080         s32 latency_usec = (s32) data;
3081         struct ieee80211_local *local =
3082                 container_of(nb, struct ieee80211_local,
3083                              network_latency_notifier);
3084
3085         mutex_lock(&local->iflist_mtx);
3086         ieee80211_recalc_ps(local, latency_usec);
3087         mutex_unlock(&local->iflist_mtx);
3088
3089         return 0;
3090 }
3091
3092 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3093                                      struct cfg80211_bss *bss, bool assoc)
3094 {
3095         struct ieee80211_local *local = sdata->local;
3096         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3097         struct sta_info *sta;
3098         bool have_sta = false;
3099         int err;
3100
3101         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3102                 return -EINVAL;
3103
3104         if (assoc) {
3105                 rcu_read_lock();
3106                 have_sta = sta_info_get(sdata, bss->bssid);
3107                 rcu_read_unlock();
3108         }
3109
3110         if (!have_sta) {
3111                 sta = sta_info_alloc(sdata, bss->bssid, GFP_KERNEL);
3112                 if (!sta)
3113                         return -ENOMEM;
3114         }
3115
3116         mutex_lock(&local->mtx);
3117         ieee80211_recalc_idle(sdata->local);
3118         mutex_unlock(&local->mtx);
3119
3120         /* switch to the right channel */
3121         local->oper_channel = bss->channel;
3122         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3123
3124         if (!have_sta) {
3125                 /* set BSSID - if STA already there this will be set too */
3126                 memcpy(ifmgd->bssid, bss->bssid, ETH_ALEN);
3127                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3128
3129                 if (assoc)
3130                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3131
3132                 err = sta_info_insert(sta);
3133                 sta = NULL;
3134                 if (err) {
3135                         printk(KERN_DEBUG
3136                                "%s: failed to insert STA entry for the AP (error %d)\n",
3137                                sdata->name, err);
3138                         return err;
3139                 }
3140         } else
3141                 WARN_ON_ONCE(compare_ether_addr(ifmgd->bssid, bss->bssid));
3142
3143         return 0;
3144 }
3145
3146 /* config hooks */
3147 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3148                        struct cfg80211_auth_request *req)
3149 {
3150         struct ieee80211_local *local = sdata->local;
3151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3152         struct ieee80211_mgd_auth_data *auth_data;
3153         u16 auth_alg;
3154         int err;
3155
3156         /* prepare auth data structure */
3157
3158         switch (req->auth_type) {
3159         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3160                 auth_alg = WLAN_AUTH_OPEN;
3161                 break;
3162         case NL80211_AUTHTYPE_SHARED_KEY:
3163                 if (IS_ERR(local->wep_tx_tfm))
3164                         return -EOPNOTSUPP;
3165                 auth_alg = WLAN_AUTH_SHARED_KEY;
3166                 break;
3167         case NL80211_AUTHTYPE_FT:
3168                 auth_alg = WLAN_AUTH_FT;
3169                 break;
3170         case NL80211_AUTHTYPE_NETWORK_EAP:
3171                 auth_alg = WLAN_AUTH_LEAP;
3172                 break;
3173         default:
3174                 return -EOPNOTSUPP;
3175         }
3176
3177         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3178         if (!auth_data)
3179                 return -ENOMEM;
3180
3181         auth_data->bss = req->bss;
3182
3183         if (req->ie && req->ie_len) {
3184                 memcpy(auth_data->ie, req->ie, req->ie_len);
3185                 auth_data->ie_len = req->ie_len;
3186         }
3187
3188         if (req->key && req->key_len) {
3189                 auth_data->key_len = req->key_len;
3190                 auth_data->key_idx = req->key_idx;
3191                 memcpy(auth_data->key, req->key, req->key_len);
3192         }
3193
3194         auth_data->algorithm = auth_alg;
3195
3196         /* try to authenticate/probe */
3197
3198         mutex_lock(&ifmgd->mtx);
3199
3200         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3201             ifmgd->assoc_data) {
3202                 err = -EBUSY;
3203                 goto err_free;
3204         }
3205
3206         if (ifmgd->auth_data)
3207                 ieee80211_destroy_auth_data(sdata, false);
3208
3209         /* prep auth_data so we don't go into idle on disassoc */
3210         ifmgd->auth_data = auth_data;
3211
3212         if (ifmgd->associated)
3213                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3214
3215         printk(KERN_DEBUG "%s: authenticate with %pM\n",
3216                sdata->name, req->bss->bssid);
3217
3218         err = ieee80211_prep_connection(sdata, req->bss, false);
3219         if (err)
3220                 goto err_clear;
3221
3222         err = ieee80211_probe_auth(sdata);
3223         if (err) {
3224                 sta_info_destroy_addr(sdata, req->bss->bssid);
3225                 goto err_clear;
3226         }
3227
3228         /* hold our own reference */
3229         cfg80211_ref_bss(auth_data->bss);
3230         err = 0;
3231         goto out_unlock;
3232
3233  err_clear:
3234         ifmgd->auth_data = NULL;
3235  err_free:
3236         kfree(auth_data);
3237  out_unlock:
3238         mutex_unlock(&ifmgd->mtx);
3239
3240         return err;
3241 }
3242
3243 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3244                         struct cfg80211_assoc_request *req)
3245 {
3246         struct ieee80211_local *local = sdata->local;
3247         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3248         struct ieee80211_bss *bss = (void *)req->bss->priv;
3249         struct ieee80211_mgd_assoc_data *assoc_data;
3250         struct ieee80211_supported_band *sband;
3251         const u8 *ssidie;
3252         int i, err;
3253
3254         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3255         if (!ssidie)
3256                 return -EINVAL;
3257
3258         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3259         if (!assoc_data)
3260                 return -ENOMEM;
3261
3262         mutex_lock(&ifmgd->mtx);
3263
3264         if (ifmgd->associated)
3265                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3266
3267         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3268                 err = -EBUSY;
3269                 goto err_free;
3270         }
3271
3272         if (ifmgd->assoc_data) {
3273                 err = -EBUSY;
3274                 goto err_free;
3275         }
3276
3277         if (ifmgd->auth_data) {
3278                 bool match;
3279
3280                 /* keep sta info, bssid if matching */
3281                 match = compare_ether_addr(ifmgd->bssid, req->bss->bssid) == 0;
3282                 ieee80211_destroy_auth_data(sdata, match);
3283         }
3284
3285         /* prepare assoc data */
3286
3287         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3288         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3289
3290         ifmgd->beacon_crc_valid = false;
3291
3292         /*
3293          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3294          * We still associate in non-HT mode (11a/b/g) if any one of these
3295          * ciphers is configured as pairwise.
3296          * We can set this to true for non-11n hardware, that'll be checked
3297          * separately along with the peer capabilities.
3298          */
3299         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
3300                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3301                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3302                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
3303                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3304
3305         if (req->flags & ASSOC_REQ_DISABLE_HT)
3306                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3307
3308         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3309         sband = local->hw.wiphy->bands[req->bss->channel->band];
3310         if (!sband->ht_cap.ht_supported ||
3311             local->hw.queues < 4 || !bss->wmm_used)
3312                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3313
3314         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3315         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3316                sizeof(ifmgd->ht_capa_mask));
3317
3318         if (req->ie && req->ie_len) {
3319                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3320                 assoc_data->ie_len = req->ie_len;
3321         }
3322
3323         assoc_data->bss = req->bss;
3324
3325         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3326                 if (ifmgd->powersave)
3327                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3328                 else
3329                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3330         } else
3331                 ifmgd->ap_smps = ifmgd->req_smps;
3332
3333         assoc_data->capability = req->bss->capability;
3334         assoc_data->wmm = bss->wmm_used && (local->hw.queues >= 4);
3335         assoc_data->supp_rates = bss->supp_rates;
3336         assoc_data->supp_rates_len = bss->supp_rates_len;
3337         assoc_data->ht_information_ie =
3338                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
3339
3340         if (bss->wmm_used && bss->uapsd_supported &&
3341             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3342                 assoc_data->uapsd = true;
3343                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3344         } else {
3345                 assoc_data->uapsd = false;
3346                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3347         }
3348
3349         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3350         assoc_data->ssid_len = ssidie[1];
3351
3352         if (req->prev_bssid)
3353                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3354
3355         if (req->use_mfp) {
3356                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3357                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3358         } else {
3359                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3360                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3361         }
3362
3363         if (req->crypto.control_port)
3364                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3365         else
3366                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3367
3368         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3369         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3370
3371         /* kick off associate process */
3372
3373         ifmgd->assoc_data = assoc_data;
3374
3375         err = ieee80211_prep_connection(sdata, req->bss, true);
3376         if (err)
3377                 goto err_clear;
3378
3379         if (!bss->dtim_period &&
3380             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3381                 /*
3382                  * Wait up to one beacon interval ...
3383                  * should this be more if we miss one?
3384                  */
3385                 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
3386                        sdata->name, ifmgd->bssid);
3387                 assoc_data->timeout = jiffies +
3388                                 TU_TO_EXP_TIME(req->bss->beacon_interval);
3389         } else {
3390                 assoc_data->have_beacon = true;
3391                 assoc_data->sent_assoc = false;
3392                 assoc_data->timeout = jiffies;
3393         }
3394         run_again(ifmgd, assoc_data->timeout);
3395
3396         if (bss->corrupt_data) {
3397                 char *corrupt_type = "data";
3398                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3399                         if (bss->corrupt_data &
3400                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3401                                 corrupt_type = "beacon and probe response";
3402                         else
3403                                 corrupt_type = "beacon";
3404                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3405                         corrupt_type = "probe response";
3406                 printk(KERN_DEBUG "%s: associating with AP with corrupt %s\n",
3407                        sdata->name, corrupt_type);
3408         }
3409
3410         err = 0;
3411         goto out;
3412  err_clear:
3413         ifmgd->assoc_data = NULL;
3414  err_free:
3415         kfree(assoc_data);
3416  out:
3417         mutex_unlock(&ifmgd->mtx);
3418
3419         return err;
3420 }
3421
3422 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3423                          struct cfg80211_deauth_request *req)
3424 {
3425         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3426         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3427
3428         mutex_lock(&ifmgd->mtx);
3429
3430         if (ifmgd->auth_data) {
3431                 ieee80211_destroy_auth_data(sdata, false);
3432                 mutex_unlock(&ifmgd->mtx);
3433                 return 0;
3434         }
3435
3436         printk(KERN_DEBUG
3437                "%s: deauthenticating from %pM by local choice (reason=%d)\n",
3438                sdata->name, req->bssid, req->reason_code);
3439
3440         if (ifmgd->associated &&
3441             compare_ether_addr(ifmgd->associated->bssid, req->bssid) == 0)
3442                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3443                                        req->reason_code, true, frame_buf);
3444         else
3445                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3446                                                IEEE80211_STYPE_DEAUTH,
3447                                                req->reason_code, true,
3448                                                frame_buf);
3449         mutex_unlock(&ifmgd->mtx);
3450
3451         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3452
3453         mutex_lock(&sdata->local->mtx);
3454         ieee80211_recalc_idle(sdata->local);
3455         mutex_unlock(&sdata->local->mtx);
3456
3457         return 0;
3458 }
3459
3460 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3461                            struct cfg80211_disassoc_request *req)
3462 {
3463         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3464         u8 bssid[ETH_ALEN];
3465         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3466
3467         mutex_lock(&ifmgd->mtx);
3468
3469         /*
3470          * cfg80211 should catch this ... but it's racy since
3471          * we can receive a disassoc frame, process it, hand it
3472          * to cfg80211 while that's in a locked section already
3473          * trying to tell us that the user wants to disconnect.
3474          */
3475         if (ifmgd->associated != req->bss) {
3476                 mutex_unlock(&ifmgd->mtx);
3477                 return -ENOLINK;
3478         }
3479
3480         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
3481                sdata->name, req->bss->bssid, req->reason_code);
3482
3483         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3484         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3485                                req->reason_code, !req->local_state_change,
3486                                frame_buf);
3487         mutex_unlock(&ifmgd->mtx);
3488
3489         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3490
3491         mutex_lock(&sdata->local->mtx);
3492         ieee80211_recalc_idle(sdata->local);
3493         mutex_unlock(&sdata->local->mtx);
3494
3495         return 0;
3496 }
3497
3498 void ieee80211_mgd_teardown(struct ieee80211_sub_if_data *sdata)
3499 {
3500         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3501
3502         mutex_lock(&ifmgd->mtx);
3503         if (ifmgd->assoc_data)
3504                 ieee80211_destroy_assoc_data(sdata, false);
3505         if (ifmgd->auth_data)
3506                 ieee80211_destroy_auth_data(sdata, false);
3507         del_timer_sync(&ifmgd->timer);
3508         mutex_unlock(&ifmgd->mtx);
3509 }
3510
3511 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3512                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3513                                gfp_t gfp)
3514 {
3515         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3516
3517         trace_api_cqm_rssi_notify(sdata, rssi_event);
3518
3519         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3520 }
3521 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
3522
3523 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
3524 {
3525         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3526         return sdata->dev->operstate;
3527 }
3528 EXPORT_SYMBOL(ieee80211_get_operstate);