net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  34 #define IEEE80211_AUTH_MAX_TRIES 3
  35 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
  36 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  37 #define IEEE80211_ASSOC_MAX_TRIES 3
  38
  39 static int max_nullfunc_tries = 2;
  40 module_param(max_nullfunc_tries, int, 0644);
  41 MODULE_PARM_DESC(max_nullfunc_tries,
  42                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  43
  44 static int max_probe_tries = 5;
  45 module_param(max_probe_tries, int, 0644);
  46 MODULE_PARM_DESC(max_probe_tries,
  47                  "Maximum probe tries before disconnecting (reason 4).");
  48
  49 /*
  50  * Beacon loss timeout is calculated as N frames times the
  51  * advertised beacon interval.  This may need to be somewhat
  52  * higher than what hardware might detect to account for
  53  * delays in the host processing frames. But since we also
  54  * probe on beacon miss before declaring the connection lost
  55  * default to what we want.
  56  */
  57 #define IEEE80211_BEACON_LOSS_COUNT     7
  58
  59 /*
  60  * Time the connection can be idle before we probe
  61  * it to see if we can still talk to the AP.
  62  */
  63 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  64 /*
  65  * Time we wait for a probe response after sending
  66  * a probe request because of beacon loss or for
  67  * checking the connection still works.
  68  */
  69 static int probe_wait_ms = 500;
  70 module_param(probe_wait_ms, int, 0644);
  71 MODULE_PARM_DESC(probe_wait_ms,
  72                  "Maximum time(ms) to wait for probe response"
  73                  " before disconnecting (reason 4).");
  74
  75 /*
  76  * Weight given to the latest Beacon frame when calculating average signal
  77  * strength for Beacon frames received in the current BSS. This must be
  78  * between 1 and 15.
  79  */
  80 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  81
  82 /*
  83  * How many Beacon frames need to have been used in average signal strength
  84  * before starting to indicate signal change events.
  85  */
  86 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  87
  88 #define TMR_RUNNING_TIMER       0
  89 #define TMR_RUNNING_CHANSW      1
  90
  91 #define DEAUTH_DISASSOC_LEN     (24 /* hdr */ + 2 /* reason */)
  92
  93 /*
  94  * All cfg80211 functions have to be called outside a locked
  95  * section so that they can acquire a lock themselves... This
  96  * is much simpler than queuing up things in cfg80211, but we
  97  * do need some indirection for that here.
  98  */
  99 enum rx_mgmt_action {
 100         /* no action required */
 101         RX_MGMT_NONE,
 102
 103         /* caller must call cfg80211_send_deauth() */
 104         RX_MGMT_CFG80211_DEAUTH,
 105
 106         /* caller must call cfg80211_send_disassoc() */
 107         RX_MGMT_CFG80211_DISASSOC,
 108
 109         /* caller must call cfg80211_send_rx_auth() */
 110         RX_MGMT_CFG80211_RX_AUTH,
 111
 112         /* caller must call cfg80211_send_rx_assoc() */
 113         RX_MGMT_CFG80211_RX_ASSOC,
 114
 115         /* caller must call cfg80211_send_assoc_timeout() */
 116         RX_MGMT_CFG80211_ASSOC_TIMEOUT,
 117 };
 118
 119 /* utils */
 120 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 121 {
 122         lockdep_assert_held(&ifmgd->mtx);
 123 }
 124
 125 /*
 126  * We can have multiple work items (and connection probing)
 127  * scheduling this timer, but we need to take care to only
 128  * reschedule it when it should fire _earlier_ than it was
 129  * asked for before, or if it's not pending right now. This
 130  * function ensures that. Note that it then is required to
 131  * run this function for all timeouts after the first one
 132  * has happened -- the work that runs from this timer will
 133  * do that.
 134  */
 135 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
 136 {
 137         ASSERT_MGD_MTX(ifmgd);
 138
 139         if (!timer_pending(&ifmgd->timer) ||
 140             time_before(timeout, ifmgd->timer.expires))
 141                 mod_timer(&ifmgd->timer, timeout);
 142 }
 143
 144 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 145 {
 146         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 147                 return;
 148
 149         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 150                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 151 }
 152
 153 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 154 {
 155         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 156
 157         if (unlikely(!sdata->u.mgd.associated))
 158                 return;
 159
 160         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 161                 return;
 162
 163         mod_timer(&sdata->u.mgd.conn_mon_timer,
 164                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 165
 166         ifmgd->probe_send_count = 0;
 167 }
 168
 169 static int ecw2cw(int ecw)
 170 {
 171         return (1 << ecw) - 1;
 172 }
 173
 174 static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
 175                                   struct ieee80211_ht_operation *ht_oper,
 176                                   const u8 *bssid, bool reconfig)
 177 {
 178         struct ieee80211_local *local = sdata->local;
 179         struct ieee80211_supported_band *sband;
 180         struct sta_info *sta;
 181         u32 changed = 0;
 182         u16 ht_opmode;
 183         bool disable_40 = false;
 184
 185         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 186
 187         switch (sdata->vif.bss_conf.channel_type) {
 188         case NL80211_CHAN_HT40PLUS:
 189                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
 190                         disable_40 = true;
 191                 break;
 192         case NL80211_CHAN_HT40MINUS:
 193                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
 194                         disable_40 = true;
 195                 break;
 196         default:
 197                 break;
 198         }
 199
 200         /* This can change during the lifetime of the BSS */
 201         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 202                 disable_40 = true;
 203
 204         mutex_lock(&local->sta_mtx);
 205         sta = sta_info_get(sdata, bssid);
 206
 207         WARN_ON_ONCE(!sta);
 208
 209         if (sta && !sta->supports_40mhz)
 210                 disable_40 = true;
 211
 212         if (sta && (!reconfig ||
 213                     (disable_40 != !(sta->sta.ht_cap.cap &
 214                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 215
 216                 if (disable_40)
 217                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 218                 else
 219                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 220
 221                 rate_control_rate_update(local, sband, sta,
 222                                          IEEE80211_RC_BW_CHANGED);
 223         }
 224         mutex_unlock(&local->sta_mtx);
 225
 226         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 227
 228         /* if bss configuration changed store the new one */
 229         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 230                 changed |= BSS_CHANGED_HT;
 231                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 232         }
 233
 234         return changed;
 235 }
 236
 237 /* frame sending functions */
 238
 239 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 240                                       struct ieee80211_supported_band *sband,
 241                                       u32 *rates)
 242 {
 243         int i, j, count;
 244         *rates = 0;
 245         count = 0;
 246         for (i = 0; i < supp_rates_len; i++) {
 247                 int rate = (supp_rates[i] & 0x7F) * 5;
 248
 249                 for (j = 0; j < sband->n_bitrates; j++)
 250                         if (sband->bitrates[j].bitrate == rate) {
 251                                 *rates |= BIT(j);
 252                                 count++;
 253                                 break;
 254                         }
 255         }
 256
 257         return count;
 258 }
 259
 260 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 261                                 struct sk_buff *skb, const u8 *ht_oper_ie,
 262                                 struct ieee80211_supported_band *sband,
 263                                 struct ieee80211_channel *channel,
 264                                 enum ieee80211_smps_mode smps)
 265 {
 266         struct ieee80211_ht_operation *ht_oper;
 267         u8 *pos;
 268         u32 flags = channel->flags;
 269         u16 cap;
 270         struct ieee80211_sta_ht_cap ht_cap;
 271
 272         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 273
 274         if (!ht_oper_ie)
 275                 return;
 276
 277         if (ht_oper_ie[1] < sizeof(struct ieee80211_ht_operation))
 278                 return;
 279
 280         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 281         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 282
 283         ht_oper = (struct ieee80211_ht_operation *)(ht_oper_ie + 2);
 284
 285         /* determine capability flags */
 286         cap = ht_cap.cap;
 287
 288         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 289         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 290                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 291                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 292                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 293                 }
 294                 break;
 295         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 296                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 297                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 298                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 299                 }
 300                 break;
 301         }
 302
 303         /*
 304          * If 40 MHz was disabled associate as though we weren't
 305          * capable of 40 MHz -- some broken APs will never fall
 306          * back to trying to transmit in 20 MHz.
 307          */
 308         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 309                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 310                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 311         }
 312
 313         /* set SM PS mode properly */
 314         cap &= ~IEEE80211_HT_CAP_SM_PS;
 315         switch (smps) {
 316         case IEEE80211_SMPS_AUTOMATIC:
 317         case IEEE80211_SMPS_NUM_MODES:
 318                 WARN_ON(1);
 319         case IEEE80211_SMPS_OFF:
 320                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 321                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 322                 break;
 323         case IEEE80211_SMPS_STATIC:
 324                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 325                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 326                 break;
 327         case IEEE80211_SMPS_DYNAMIC:
 328                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 329                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 330                 break;
 331         }
 332
 333         /* reserve and fill IE */
 334         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 335         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 336 }
 337
 338 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 339 {
 340         struct ieee80211_local *local = sdata->local;
 341         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 342         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 343         struct sk_buff *skb;
 344         struct ieee80211_mgmt *mgmt;
 345         u8 *pos, qos_info;
 346         size_t offset = 0, noffset;
 347         int i, count, rates_len, supp_rates_len;
 348         u16 capab;
 349         struct ieee80211_supported_band *sband;
 350         u32 rates = 0;
 351
 352         lockdep_assert_held(&ifmgd->mtx);
 353
 354         sband = local->hw.wiphy->bands[local->oper_channel->band];
 355
 356         if (assoc_data->supp_rates_len) {
 357                 /*
 358                  * Get all rates supported by the device and the AP as
 359                  * some APs don't like getting a superset of their rates
 360                  * in the association request (e.g. D-Link DAP 1353 in
 361                  * b-only mode)...
 362                  */
 363                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 364                                                        assoc_data->supp_rates_len,
 365                                                        sband, &rates);
 366         } else {
 367                 /*
 368                  * In case AP not provide any supported rates information
 369                  * before association, we send information element(s) with
 370                  * all rates that we support.
 371                  */
 372                 rates = ~0;
 373                 rates_len = sband->n_bitrates;
 374         }
 375
 376         skb = alloc_skb(local->hw.extra_tx_headroom +
 377                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 378                         2 + assoc_data->ssid_len + /* SSID */
 379                         4 + rates_len + /* (extended) rates */
 380                         4 + /* power capability */
 381                         2 + 2 * sband->n_channels + /* supported channels */
 382                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 383                         assoc_data->ie_len + /* extra IEs */
 384                         9, /* WMM */
 385                         GFP_KERNEL);
 386         if (!skb)
 387                 return;
 388
 389         skb_reserve(skb, local->hw.extra_tx_headroom);
 390
 391         capab = WLAN_CAPABILITY_ESS;
 392
 393         if (sband->band == IEEE80211_BAND_2GHZ) {
 394                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 395                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 396                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 397                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 398         }
 399
 400         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 401                 capab |= WLAN_CAPABILITY_PRIVACY;
 402
 403         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 404             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 405                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 406
 407         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 408         memset(mgmt, 0, 24);
 409         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 410         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 411         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 412
 413         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 414                 skb_put(skb, 10);
 415                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 416                                                   IEEE80211_STYPE_REASSOC_REQ);
 417                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 418                 mgmt->u.reassoc_req.listen_interval =
 419                                 cpu_to_le16(local->hw.conf.listen_interval);
 420                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 421                        ETH_ALEN);
 422         } else {
 423                 skb_put(skb, 4);
 424                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 425                                                   IEEE80211_STYPE_ASSOC_REQ);
 426                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 427                 mgmt->u.assoc_req.listen_interval =
 428                                 cpu_to_le16(local->hw.conf.listen_interval);
 429         }
 430
 431         /* SSID */
 432         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 433         *pos++ = WLAN_EID_SSID;
 434         *pos++ = assoc_data->ssid_len;
 435         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 436
 437         /* add all rates which were marked to be used above */
 438         supp_rates_len = rates_len;
 439         if (supp_rates_len > 8)
 440                 supp_rates_len = 8;
 441
 442         pos = skb_put(skb, supp_rates_len + 2);
 443         *pos++ = WLAN_EID_SUPP_RATES;
 444         *pos++ = supp_rates_len;
 445
 446         count = 0;
 447         for (i = 0; i < sband->n_bitrates; i++) {
 448                 if (BIT(i) & rates) {
 449                         int rate = sband->bitrates[i].bitrate;
 450                         *pos++ = (u8) (rate / 5);
 451                         if (++count == 8)
 452                                 break;
 453                 }
 454         }
 455
 456         if (rates_len > count) {
 457                 pos = skb_put(skb, rates_len - count + 2);
 458                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 459                 *pos++ = rates_len - count;
 460
 461                 for (i++; i < sband->n_bitrates; i++) {
 462                         if (BIT(i) & rates) {
 463                                 int rate = sband->bitrates[i].bitrate;
 464                                 *pos++ = (u8) (rate / 5);
 465                         }
 466                 }
 467         }
 468
 469         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 470                 /* 1. power capabilities */
 471                 pos = skb_put(skb, 4);
 472                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 473                 *pos++ = 2;
 474                 *pos++ = 0; /* min tx power */
 475                 *pos++ = local->oper_channel->max_power; /* max tx power */
 476
 477                 /* 2. supported channels */
 478                 /* TODO: get this in reg domain format */
 479                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 480                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 481                 *pos++ = 2 * sband->n_channels;
 482                 for (i = 0; i < sband->n_channels; i++) {
 483                         *pos++ = ieee80211_frequency_to_channel(
 484                                         sband->channels[i].center_freq);
 485                         *pos++ = 1; /* one channel in the subband*/
 486                 }
 487         }
 488
 489         /* if present, add any custom IEs that go before HT */
 490         if (assoc_data->ie_len && assoc_data->ie) {
 491                 static const u8 before_ht[] = {
 492                         WLAN_EID_SSID,
 493                         WLAN_EID_SUPP_RATES,
 494                         WLAN_EID_EXT_SUPP_RATES,
 495                         WLAN_EID_PWR_CAPABILITY,
 496                         WLAN_EID_SUPPORTED_CHANNELS,
 497                         WLAN_EID_RSN,
 498                         WLAN_EID_QOS_CAPA,
 499                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 500                         WLAN_EID_MOBILITY_DOMAIN,
 501                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 502                 };
 503                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 504                                              before_ht, ARRAY_SIZE(before_ht),
 505                                              offset);
 506                 pos = skb_put(skb, noffset - offset);
 507                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 508                 offset = noffset;
 509         }
 510
 511         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 512                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ht_operation_ie,
 513                                     sband, local->oper_channel, ifmgd->ap_smps);
 514
 515         /* if present, add any custom non-vendor IEs that go after HT */
 516         if (assoc_data->ie_len && assoc_data->ie) {
 517                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 518                                                     assoc_data->ie_len,
 519                                                     offset);
 520                 pos = skb_put(skb, noffset - offset);
 521                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 522                 offset = noffset;
 523         }
 524
 525         if (assoc_data->wmm) {
 526                 if (assoc_data->uapsd) {
 527                         qos_info = ifmgd->uapsd_queues;
 528                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 529                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 530                 } else {
 531                         qos_info = 0;
 532                 }
 533
 534                 pos = skb_put(skb, 9);
 535                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 536                 *pos++ = 7; /* len */
 537                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 538                 *pos++ = 0x50;
 539                 *pos++ = 0xf2;
 540                 *pos++ = 2; /* WME */
 541                 *pos++ = 0; /* WME info */
 542                 *pos++ = 1; /* WME ver */
 543                 *pos++ = qos_info;
 544         }
 545
 546         /* add any remaining custom (i.e. vendor specific here) IEs */
 547         if (assoc_data->ie_len && assoc_data->ie) {
 548                 noffset = assoc_data->ie_len;
 549                 pos = skb_put(skb, noffset - offset);
 550                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 551         }
 552
 553         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 554         ieee80211_tx_skb(sdata, skb);
 555 }
 556
 557 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 558                                            const u8 *bssid, u16 stype,
 559                                            u16 reason, bool send_frame,
 560                                            u8 *frame_buf)
 561 {
 562         struct ieee80211_local *local = sdata->local;
 563         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 564         struct sk_buff *skb;
 565         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 566
 567         /* build frame */
 568         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 569         mgmt->duration = 0; /* initialize only */
 570         mgmt->seq_ctrl = 0; /* initialize only */
 571         memcpy(mgmt->da, bssid, ETH_ALEN);
 572         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 573         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 574         /* u.deauth.reason_code == u.disassoc.reason_code */
 575         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 576
 577         if (send_frame) {
 578                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 579                                     DEAUTH_DISASSOC_LEN);
 580                 if (!skb)
 581                         return;
 582
 583                 skb_reserve(skb, local->hw.extra_tx_headroom);
 584
 585                 /* copy in frame */
 586                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 587                        mgmt, DEAUTH_DISASSOC_LEN);
 588
 589                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 590                         IEEE80211_SKB_CB(skb)->flags |=
 591                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
 592                 ieee80211_tx_skb(sdata, skb);
 593         }
 594 }
 595
 596 void ieee80211_send_pspoll(struct ieee80211_local *local,
 597                            struct ieee80211_sub_if_data *sdata)
 598 {
 599         struct ieee80211_pspoll *pspoll;
 600         struct sk_buff *skb;
 601
 602         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 603         if (!skb)
 604                 return;
 605
 606         pspoll = (struct ieee80211_pspoll *) skb->data;
 607         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 608
 609         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 610         ieee80211_tx_skb(sdata, skb);
 611 }
 612
 613 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 614                              struct ieee80211_sub_if_data *sdata,
 615                              int powersave)
 616 {
 617         struct sk_buff *skb;
 618         struct ieee80211_hdr_3addr *nullfunc;
 619         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 620
 621         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 622         if (!skb)
 623                 return;
 624
 625         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 626         if (powersave)
 627                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 628
 629         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 630         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 631                             IEEE80211_STA_CONNECTION_POLL))
 632                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 633
 634         ieee80211_tx_skb(sdata, skb);
 635 }
 636
 637 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 638                                           struct ieee80211_sub_if_data *sdata)
 639 {
 640         struct sk_buff *skb;
 641         struct ieee80211_hdr *nullfunc;
 642         __le16 fc;
 643
 644         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 645                 return;
 646
 647         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 648         if (!skb)
 649                 return;
 650
 651         skb_reserve(skb, local->hw.extra_tx_headroom);
 652
 653         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 654         memset(nullfunc, 0, 30);
 655         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 656                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 657         nullfunc->frame_control = fc;
 658         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 659         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 660         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 661         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 662
 663         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 664         ieee80211_tx_skb(sdata, skb);
 665 }
 666
 667 /* spectrum management related things */
 668 static void ieee80211_chswitch_work(struct work_struct *work)
 669 {
 670         struct ieee80211_sub_if_data *sdata =
 671                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 672         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 673
 674         if (!ieee80211_sdata_running(sdata))
 675                 return;
 676
 677         mutex_lock(&ifmgd->mtx);
 678         if (!ifmgd->associated)
 679                 goto out;
 680
 681         sdata->local->oper_channel = sdata->local->csa_channel;
 682         if (!sdata->local->ops->channel_switch) {
 683                 /* call "hw_config" only if doing sw channel switch */
 684                 ieee80211_hw_config(sdata->local,
 685                         IEEE80211_CONF_CHANGE_CHANNEL);
 686         } else {
 687                 /* update the device channel directly */
 688                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 689         }
 690
 691         /* XXX: shouldn't really modify cfg80211-owned data! */
 692         ifmgd->associated->channel = sdata->local->oper_channel;
 693
 694         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 695                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 696  out:
 697         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 698         mutex_unlock(&ifmgd->mtx);
 699 }
 700
 701 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 702 {
 703         struct ieee80211_sub_if_data *sdata;
 704         struct ieee80211_if_managed *ifmgd;
 705
 706         sdata = vif_to_sdata(vif);
 707         ifmgd = &sdata->u.mgd;
 708
 709         trace_api_chswitch_done(sdata, success);
 710         if (!success) {
 711                 /*
 712                  * If the channel switch was not successful, stay
 713                  * around on the old channel. We currently lack
 714                  * good handling of this situation, possibly we
 715                  * should just drop the association.
 716                  */
 717                 sdata->local->csa_channel = sdata->local->oper_channel;
 718         }
 719
 720         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 721 }
 722 EXPORT_SYMBOL(ieee80211_chswitch_done);
 723
 724 static void ieee80211_chswitch_timer(unsigned long data)
 725 {
 726         struct ieee80211_sub_if_data *sdata =
 727                 (struct ieee80211_sub_if_data *) data;
 728         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 729
 730         if (sdata->local->quiescing) {
 731                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 732                 return;
 733         }
 734
 735         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 736 }
 737
 738 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 739                                       struct ieee80211_channel_sw_ie *sw_elem,
 740                                       struct ieee80211_bss *bss,
 741                                       u64 timestamp)
 742 {
 743         struct cfg80211_bss *cbss =
 744                 container_of((void *)bss, struct cfg80211_bss, priv);
 745         struct ieee80211_channel *new_ch;
 746         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 747         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 748                                                       cbss->channel->band);
 749
 750         ASSERT_MGD_MTX(ifmgd);
 751
 752         if (!ifmgd->associated)
 753                 return;
 754
 755         if (sdata->local->scanning)
 756                 return;
 757
 758         /* Disregard subsequent beacons if we are already running a timer
 759            processing a CSA */
 760
 761         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 762                 return;
 763
 764         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 765         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 766                 return;
 767
 768         sdata->local->csa_channel = new_ch;
 769
 770         if (sdata->local->ops->channel_switch) {
 771                 /* use driver's channel switch callback */
 772                 struct ieee80211_channel_switch ch_switch;
 773                 memset(&ch_switch, 0, sizeof(ch_switch));
 774                 ch_switch.timestamp = timestamp;
 775                 if (sw_elem->mode) {
 776                         ch_switch.block_tx = true;
 777                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 778                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 779                 }
 780                 ch_switch.channel = new_ch;
 781                 ch_switch.count = sw_elem->count;
 782                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 783                 drv_channel_switch(sdata->local, &ch_switch);
 784                 return;
 785         }
 786
 787         /* channel switch handled in software */
 788         if (sw_elem->count <= 1) {
 789                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 790         } else {
 791                 if (sw_elem->mode)
 792                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 793                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 794                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 795                 mod_timer(&ifmgd->chswitch_timer,
 796                           jiffies +
 797                           msecs_to_jiffies(sw_elem->count *
 798                                            cbss->beacon_interval));
 799         }
 800 }
 801
 802 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 803                                         u16 capab_info, u8 *pwr_constr_elem,
 804                                         u8 pwr_constr_elem_len)
 805 {
 806         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 807
 808         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 809                 return;
 810
 811         /* Power constraint IE length should be 1 octet */
 812         if (pwr_constr_elem_len != 1)
 813                 return;
 814
 815         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 816             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 817                 sdata->local->power_constr_level = *pwr_constr_elem;
 818                 ieee80211_hw_config(sdata->local, 0);
 819         }
 820 }
 821
 822 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 823 {
 824         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 825         struct ieee80211_local *local = sdata->local;
 826         struct ieee80211_conf *conf = &local->hw.conf;
 827
 828         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 829                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 830                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 831
 832         local->disable_dynamic_ps = false;
 833         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 834 }
 835 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 836
 837 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 838 {
 839         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 840         struct ieee80211_local *local = sdata->local;
 841         struct ieee80211_conf *conf = &local->hw.conf;
 842
 843         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 844                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 845                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 846
 847         local->disable_dynamic_ps = true;
 848         conf->dynamic_ps_timeout = 0;
 849         del_timer_sync(&local->dynamic_ps_timer);
 850         ieee80211_queue_work(&local->hw,
 851                              &local->dynamic_ps_enable_work);
 852 }
 853 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 854
 855 /* powersave */
 856 static void ieee80211_enable_ps(struct ieee80211_local *local,
 857                                 struct ieee80211_sub_if_data *sdata)
 858 {
 859         struct ieee80211_conf *conf = &local->hw.conf;
 860
 861         /*
 862          * If we are scanning right now then the parameters will
 863          * take effect when scan finishes.
 864          */
 865         if (local->scanning)
 866                 return;
 867
 868         if (conf->dynamic_ps_timeout > 0 &&
 869             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 870                 mod_timer(&local->dynamic_ps_timer, jiffies +
 871                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 872         } else {
 873                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 874                         ieee80211_send_nullfunc(local, sdata, 1);
 875
 876                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 877                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 878                         return;
 879
 880                 conf->flags |= IEEE80211_CONF_PS;
 881                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 882         }
 883 }
 884
 885 static void ieee80211_change_ps(struct ieee80211_local *local)
 886 {
 887         struct ieee80211_conf *conf = &local->hw.conf;
 888
 889         if (local->ps_sdata) {
 890                 ieee80211_enable_ps(local, local->ps_sdata);
 891         } else if (conf->flags & IEEE80211_CONF_PS) {
 892                 conf->flags &= ~IEEE80211_CONF_PS;
 893                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 894                 del_timer_sync(&local->dynamic_ps_timer);
 895                 cancel_work_sync(&local->dynamic_ps_enable_work);
 896         }
 897 }
 898
 899 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 900 {
 901         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 902         struct sta_info *sta = NULL;
 903         bool authorized = false;
 904
 905         if (!mgd->powersave)
 906                 return false;
 907
 908         if (mgd->broken_ap)
 909                 return false;
 910
 911         if (!mgd->associated)
 912                 return false;
 913
 914         if (!mgd->associated->beacon_ies)
 915                 return false;
 916
 917         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 918                           IEEE80211_STA_CONNECTION_POLL))
 919                 return false;
 920
 921         rcu_read_lock();
 922         sta = sta_info_get(sdata, mgd->bssid);
 923         if (sta)
 924                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 925         rcu_read_unlock();
 926
 927         return authorized;
 928 }
 929
 930 /* need to hold RTNL or interface lock */
 931 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 932 {
 933         struct ieee80211_sub_if_data *sdata, *found = NULL;
 934         int count = 0;
 935         int timeout;
 936
 937         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 938                 local->ps_sdata = NULL;
 939                 return;
 940         }
 941
 942         if (!list_empty(&local->work_list)) {
 943                 local->ps_sdata = NULL;
 944                 goto change;
 945         }
 946
 947         list_for_each_entry(sdata, &local->interfaces, list) {
 948                 if (!ieee80211_sdata_running(sdata))
 949                         continue;
 950                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 951                         /* If an AP vif is found, then disable PS
 952                          * by setting the count to zero thereby setting
 953                          * ps_sdata to NULL.
 954                          */
 955                         count = 0;
 956                         break;
 957                 }
 958                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 959                         continue;
 960                 found = sdata;
 961                 count++;
 962         }
 963
 964         if (count == 1 && ieee80211_powersave_allowed(found)) {
 965                 struct ieee80211_conf *conf = &local->hw.conf;
 966                 s32 beaconint_us;
 967
 968                 if (latency < 0)
 969                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 970
 971                 beaconint_us = ieee80211_tu_to_usec(
 972                                         found->vif.bss_conf.beacon_int);
 973
 974                 timeout = local->dynamic_ps_forced_timeout;
 975                 if (timeout < 0) {
 976                         /*
 977                          * Go to full PSM if the user configures a very low
 978                          * latency requirement.
 979                          * The 2000 second value is there for compatibility
 980                          * until the PM_QOS_NETWORK_LATENCY is configured
 981                          * with real values.
 982                          */
 983                         if (latency > (1900 * USEC_PER_MSEC) &&
 984                             latency != (2000 * USEC_PER_SEC))
 985                                 timeout = 0;
 986                         else
 987                                 timeout = 100;
 988                 }
 989                 local->dynamic_ps_user_timeout = timeout;
 990                 if (!local->disable_dynamic_ps)
 991                         conf->dynamic_ps_timeout =
 992                                 local->dynamic_ps_user_timeout;
 993
 994                 if (beaconint_us > latency) {
 995                         local->ps_sdata = NULL;
 996                 } else {
 997                         struct ieee80211_bss *bss;
 998                         int maxslp = 1;
 999                         u8 dtimper;
1000
1001                         bss = (void *)found->u.mgd.associated->priv;
1002                         dtimper = bss->dtim_period;
1003
1004                         /* If the TIM IE is invalid, pretend the value is 1 */
1005                         if (!dtimper)
1006                                 dtimper = 1;
1007                         else if (dtimper > 1)
1008                                 maxslp = min_t(int, dtimper,
1009                                                     latency / beaconint_us);
1010
1011                         local->hw.conf.max_sleep_period = maxslp;
1012                         local->hw.conf.ps_dtim_period = dtimper;
1013                         local->ps_sdata = found;
1014                 }
1015         } else {
1016                 local->ps_sdata = NULL;
1017         }
1018
1019  change:
1020         ieee80211_change_ps(local);
1021 }
1022
1023 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1024 {
1025         struct ieee80211_local *local =
1026                 container_of(work, struct ieee80211_local,
1027                              dynamic_ps_disable_work);
1028
1029         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1030                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1031                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1032         }
1033
1034         ieee80211_wake_queues_by_reason(&local->hw,
1035                                         IEEE80211_QUEUE_STOP_REASON_PS);
1036 }
1037
1038 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1039 {
1040         struct ieee80211_local *local =
1041                 container_of(work, struct ieee80211_local,
1042                              dynamic_ps_enable_work);
1043         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1044         struct ieee80211_if_managed *ifmgd;
1045         unsigned long flags;
1046         int q;
1047
1048         /* can only happen when PS was just disabled anyway */
1049         if (!sdata)
1050                 return;
1051
1052         ifmgd = &sdata->u.mgd;
1053
1054         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1055                 return;
1056
1057         if (!local->disable_dynamic_ps &&
1058             local->hw.conf.dynamic_ps_timeout > 0) {
1059                 /* don't enter PS if TX frames are pending */
1060                 if (drv_tx_frames_pending(local)) {
1061                         mod_timer(&local->dynamic_ps_timer, jiffies +
1062                                   msecs_to_jiffies(
1063                                   local->hw.conf.dynamic_ps_timeout));
1064                         return;
1065                 }
1066
1067                 /*
1068                  * transmission can be stopped by others which leads to
1069                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1070                  * is not the actual idle state.
1071                  */
1072                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1073                 for (q = 0; q < local->hw.queues; q++) {
1074                         if (local->queue_stop_reasons[q]) {
1075                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1076                                                        flags);
1077                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1078                                           msecs_to_jiffies(
1079                                           local->hw.conf.dynamic_ps_timeout));
1080                                 return;
1081                         }
1082                 }
1083                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1084         }
1085
1086         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1087             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1088                 netif_tx_stop_all_queues(sdata->dev);
1089
1090                 if (drv_tx_frames_pending(local))
1091                         mod_timer(&local->dynamic_ps_timer, jiffies +
1092                                   msecs_to_jiffies(
1093                                   local->hw.conf.dynamic_ps_timeout));
1094                 else {
1095                         ieee80211_send_nullfunc(local, sdata, 1);
1096                         /* Flush to get the tx status of nullfunc frame */
1097                         drv_flush(local, false);
1098                 }
1099         }
1100
1101         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1102               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1103             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1104                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1105                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1106                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1107         }
1108
1109         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1110                 netif_tx_wake_all_queues(sdata->dev);
1111 }
1112
1113 void ieee80211_dynamic_ps_timer(unsigned long data)
1114 {
1115         struct ieee80211_local *local = (void *) data;
1116
1117         if (local->quiescing || local->suspended)
1118                 return;
1119
1120         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1121 }
1122
1123 /* MLME */
1124 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
1125                                      struct ieee80211_sub_if_data *sdata,
1126                                      u8 *wmm_param, size_t wmm_param_len)
1127 {
1128         struct ieee80211_tx_queue_params params;
1129         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1130         size_t left;
1131         int count;
1132         u8 *pos, uapsd_queues = 0;
1133
1134         if (!local->ops->conf_tx)
1135                 return;
1136
1137         if (local->hw.queues < IEEE80211_NUM_ACS)
1138                 return;
1139
1140         if (!wmm_param)
1141                 return;
1142
1143         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1144                 return;
1145
1146         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1147                 uapsd_queues = ifmgd->uapsd_queues;
1148
1149         count = wmm_param[6] & 0x0f;
1150         if (count == ifmgd->wmm_last_param_set)
1151                 return;
1152         ifmgd->wmm_last_param_set = count;
1153
1154         pos = wmm_param + 8;
1155         left = wmm_param_len - 8;
1156
1157         memset(&params, 0, sizeof(params));
1158
1159         local->wmm_acm = 0;
1160         for (; left >= 4; left -= 4, pos += 4) {
1161                 int aci = (pos[0] >> 5) & 0x03;
1162                 int acm = (pos[0] >> 4) & 0x01;
1163                 bool uapsd = false;
1164                 int queue;
1165
1166                 switch (aci) {
1167                 case 1: /* AC_BK */
1168                         queue = 3;
1169                         if (acm)
1170                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1171                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1172                                 uapsd = true;
1173                         break;
1174                 case 2: /* AC_VI */
1175                         queue = 1;
1176                         if (acm)
1177                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1178                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1179                                 uapsd = true;
1180                         break;
1181                 case 3: /* AC_VO */
1182                         queue = 0;
1183                         if (acm)
1184                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1185                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1186                                 uapsd = true;
1187                         break;
1188                 case 0: /* AC_BE */
1189                 default:
1190                         queue = 2;
1191                         if (acm)
1192                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1193                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1194                                 uapsd = true;
1195                         break;
1196                 }
1197
1198                 params.aifs = pos[0] & 0x0f;
1199                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1200                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1201                 params.txop = get_unaligned_le16(pos + 2);
1202                 params.uapsd = uapsd;
1203
1204 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1205                 wiphy_debug(local->hw.wiphy,
1206                             "WMM queue=%d aci=%d acm=%d aifs=%d "
1207                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1208                             queue, aci, acm,
1209                             params.aifs, params.cw_min, params.cw_max,
1210                             params.txop, params.uapsd);
1211 #endif
1212                 sdata->tx_conf[queue] = params;
1213                 if (drv_conf_tx(local, sdata, queue, &params))
1214                         wiphy_debug(local->hw.wiphy,
1215                                     "failed to set TX queue parameters for queue %d\n",
1216                                     queue);
1217         }
1218
1219         /* enable WMM or activate new settings */
1220         sdata->vif.bss_conf.qos = true;
1221 }
1222
1223 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1224                                            u16 capab, bool erp_valid, u8 erp)
1225 {
1226         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1227         u32 changed = 0;
1228         bool use_protection;
1229         bool use_short_preamble;
1230         bool use_short_slot;
1231
1232         if (erp_valid) {
1233                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1234                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1235         } else {
1236                 use_protection = false;
1237                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1238         }
1239
1240         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1241         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1242                 use_short_slot = true;
1243
1244         if (use_protection != bss_conf->use_cts_prot) {
1245                 bss_conf->use_cts_prot = use_protection;
1246                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1247         }
1248
1249         if (use_short_preamble != bss_conf->use_short_preamble) {
1250                 bss_conf->use_short_preamble = use_short_preamble;
1251                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1252         }
1253
1254         if (use_short_slot != bss_conf->use_short_slot) {
1255                 bss_conf->use_short_slot = use_short_slot;
1256                 changed |= BSS_CHANGED_ERP_SLOT;
1257         }
1258
1259         return changed;
1260 }
1261
1262 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1263                                      struct cfg80211_bss *cbss,
1264                                      u32 bss_info_changed)
1265 {
1266         struct ieee80211_bss *bss = (void *)cbss->priv;
1267         struct ieee80211_local *local = sdata->local;
1268         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1269
1270         bss_info_changed |= BSS_CHANGED_ASSOC;
1271         /* set timing information */
1272         bss_conf->beacon_int = cbss->beacon_interval;
1273         bss_conf->last_tsf = cbss->tsf;
1274
1275         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1276         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1277                 cbss->capability, bss->has_erp_value, bss->erp_value);
1278
1279         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1280                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1281
1282         sdata->u.mgd.associated = cbss;
1283         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1284
1285         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1286
1287         /* just to be sure */
1288         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1289                                 IEEE80211_STA_BEACON_POLL);
1290
1291         ieee80211_led_assoc(local, 1);
1292
1293         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1294                 bss_conf->dtim_period = bss->dtim_period;
1295         else
1296                 bss_conf->dtim_period = 0;
1297
1298         bss_conf->assoc = 1;
1299
1300         /* Tell the driver to monitor connection quality (if supported) */
1301         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1302             bss_conf->cqm_rssi_thold)
1303                 bss_info_changed |= BSS_CHANGED_CQM;
1304
1305         /* Enable ARP filtering */
1306         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1307                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1308                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1309         }
1310
1311         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1312
1313         mutex_lock(&local->iflist_mtx);
1314         ieee80211_recalc_ps(local, -1);
1315         ieee80211_recalc_smps(local);
1316         mutex_unlock(&local->iflist_mtx);
1317
1318         netif_tx_start_all_queues(sdata->dev);
1319         netif_carrier_on(sdata->dev);
1320 }
1321
1322 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1323                                    u16 stype, u16 reason, bool tx,
1324                                    u8 *frame_buf)
1325 {
1326         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1327         struct ieee80211_local *local = sdata->local;
1328         struct sta_info *sta;
1329         u32 changed = 0;
1330         u8 bssid[ETH_ALEN];
1331
1332         ASSERT_MGD_MTX(ifmgd);
1333
1334         if (WARN_ON_ONCE(tx && !frame_buf))
1335                 return;
1336
1337         if (WARN_ON(!ifmgd->associated))
1338                 return;
1339
1340         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1341
1342         ifmgd->associated = NULL;
1343         memset(ifmgd->bssid, 0, ETH_ALEN);
1344
1345         /*
1346          * we need to commit the associated = NULL change because the
1347          * scan code uses that to determine whether this iface should
1348          * go to/wake up from powersave or not -- and could otherwise
1349          * wake the queues erroneously.
1350          */
1351         smp_mb();
1352
1353         /*
1354          * Thus, we can only afterwards stop the queues -- to account
1355          * for the case where another CPU is finishing a scan at this
1356          * time -- we don't want the scan code to enable queues.
1357          */
1358
1359         netif_tx_stop_all_queues(sdata->dev);
1360         netif_carrier_off(sdata->dev);
1361
1362         mutex_lock(&local->sta_mtx);
1363         sta = sta_info_get(sdata, bssid);
1364         if (sta) {
1365                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1366                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1367         }
1368         mutex_unlock(&local->sta_mtx);
1369
1370         /* deauthenticate/disassociate now */
1371         if (tx || frame_buf)
1372                 ieee80211_send_deauth_disassoc(sdata, bssid, stype, reason,
1373                                                tx, frame_buf);
1374
1375         /* flush out frame */
1376         if (tx)
1377                 drv_flush(local, false);
1378
1379         /* remove AP and TDLS peers */
1380         sta_info_flush(local, sdata);
1381
1382         /* finally reset all BSS / config parameters */
1383         changed |= ieee80211_reset_erp_info(sdata);
1384
1385         ieee80211_led_assoc(local, 0);
1386         changed |= BSS_CHANGED_ASSOC;
1387         sdata->vif.bss_conf.assoc = false;
1388
1389         /* on the next assoc, re-program HT parameters */
1390         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1391         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1392
1393         local->power_constr_level = 0;
1394
1395         del_timer_sync(&local->dynamic_ps_timer);
1396         cancel_work_sync(&local->dynamic_ps_enable_work);
1397
1398         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1399                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1400                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1401         }
1402         local->ps_sdata = NULL;
1403
1404         /* Disable ARP filtering */
1405         if (sdata->vif.bss_conf.arp_filter_enabled) {
1406                 sdata->vif.bss_conf.arp_filter_enabled = false;
1407                 changed |= BSS_CHANGED_ARP_FILTER;
1408         }
1409
1410         sdata->vif.bss_conf.qos = false;
1411         changed |= BSS_CHANGED_QOS;
1412
1413         /* The BSSID (not really interesting) and HT changed */
1414         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1415         ieee80211_bss_info_change_notify(sdata, changed);
1416
1417         /* channel(_type) changes are handled by ieee80211_hw_config */
1418         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1419         ieee80211_hw_config(local, 0);
1420
1421         /* disassociated - set to defaults now */
1422         ieee80211_set_wmm_default(sdata, false);
1423
1424         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1425         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1426         del_timer_sync(&sdata->u.mgd.timer);
1427         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1428 }
1429
1430 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1431                              struct ieee80211_hdr *hdr)
1432 {
1433         /*
1434          * We can postpone the mgd.timer whenever receiving unicast frames
1435          * from AP because we know that the connection is working both ways
1436          * at that time. But multicast frames (and hence also beacons) must
1437          * be ignored here, because we need to trigger the timer during
1438          * data idle periods for sending the periodic probe request to the
1439          * AP we're connected to.
1440          */
1441         if (is_multicast_ether_addr(hdr->addr1))
1442                 return;
1443
1444         ieee80211_sta_reset_conn_monitor(sdata);
1445 }
1446
1447 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1448 {
1449         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1450         struct ieee80211_local *local = sdata->local;
1451
1452         mutex_lock(&local->mtx);
1453         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1454                               IEEE80211_STA_CONNECTION_POLL))) {
1455                 mutex_unlock(&local->mtx);
1456                 return;
1457         }
1458
1459         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1460                           IEEE80211_STA_BEACON_POLL);
1461
1462         mutex_lock(&local->iflist_mtx);
1463         ieee80211_recalc_ps(local, -1);
1464         mutex_unlock(&local->iflist_mtx);
1465
1466         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1467                 goto out;
1468
1469         /*
1470          * We've received a probe response, but are not sure whether
1471          * we have or will be receiving any beacons or data, so let's
1472          * schedule the timers again, just in case.
1473          */
1474         ieee80211_sta_reset_beacon_monitor(sdata);
1475
1476         mod_timer(&ifmgd->conn_mon_timer,
1477                   round_jiffies_up(jiffies +
1478                                    IEEE80211_CONNECTION_IDLE_TIME));
1479 out:
1480         ieee80211_run_deferred_scan(local);
1481         mutex_unlock(&local->mtx);
1482 }
1483
1484 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1485                              struct ieee80211_hdr *hdr, bool ack)
1486 {
1487         if (!ieee80211_is_data(hdr->frame_control))
1488             return;
1489
1490         if (ack)
1491                 ieee80211_sta_reset_conn_monitor(sdata);
1492
1493         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1494             sdata->u.mgd.probe_send_count > 0) {
1495                 if (ack)
1496                         sdata->u.mgd.probe_send_count = 0;
1497                 else
1498                         sdata->u.mgd.nullfunc_failed = true;
1499                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1500         }
1501 }
1502
1503 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1504 {
1505         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1506         const u8 *ssid;
1507         u8 *dst = ifmgd->associated->bssid;
1508         u8 unicast_limit = max(1, max_probe_tries - 3);
1509
1510         /*
1511          * Try sending broadcast probe requests for the last three
1512          * probe requests after the first ones failed since some
1513          * buggy APs only support broadcast probe requests.
1514          */
1515         if (ifmgd->probe_send_count >= unicast_limit)
1516                 dst = NULL;
1517
1518         /*
1519          * When the hardware reports an accurate Tx ACK status, it's
1520          * better to send a nullfunc frame instead of a probe request,
1521          * as it will kick us off the AP quickly if we aren't associated
1522          * anymore. The timeout will be reset if the frame is ACKed by
1523          * the AP.
1524          */
1525         ifmgd->probe_send_count++;
1526
1527         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1528                 ifmgd->nullfunc_failed = false;
1529                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1530         } else {
1531                 int ssid_len;
1532
1533                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1534                 if (WARN_ON_ONCE(ssid == NULL))
1535                         ssid_len = 0;
1536                 else
1537                         ssid_len = ssid[1];
1538
1539                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1540                                          0, (u32) -1, true, false);
1541         }
1542
1543         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1544         run_again(ifmgd, ifmgd->probe_timeout);
1545         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1546                 drv_flush(sdata->local, false);
1547 }
1548
1549 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1550                                    bool beacon)
1551 {
1552         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1553         bool already = false;
1554
1555         if (!ieee80211_sdata_running(sdata))
1556                 return;
1557
1558         mutex_lock(&ifmgd->mtx);
1559
1560         if (!ifmgd->associated)
1561                 goto out;
1562
1563         mutex_lock(&sdata->local->mtx);
1564
1565         if (sdata->local->tmp_channel || sdata->local->scanning) {
1566                 mutex_unlock(&sdata->local->mtx);
1567                 goto out;
1568         }
1569
1570 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1571         if (beacon)
1572                 net_dbg_ratelimited("%s: detected beacon loss from AP - sending probe request\n",
1573                                     sdata->name);
1574 #endif
1575
1576         /*
1577          * The driver/our work has already reported this event or the
1578          * connection monitoring has kicked in and we have already sent
1579          * a probe request. Or maybe the AP died and the driver keeps
1580          * reporting until we disassociate...
1581          *
1582          * In either case we have to ignore the current call to this
1583          * function (except for setting the correct probe reason bit)
1584          * because otherwise we would reset the timer every time and
1585          * never check whether we received a probe response!
1586          */
1587         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1588                             IEEE80211_STA_CONNECTION_POLL))
1589                 already = true;
1590
1591         if (beacon)
1592                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1593         else
1594                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1595
1596         mutex_unlock(&sdata->local->mtx);
1597
1598         if (already)
1599                 goto out;
1600
1601         mutex_lock(&sdata->local->iflist_mtx);
1602         ieee80211_recalc_ps(sdata->local, -1);
1603         mutex_unlock(&sdata->local->iflist_mtx);
1604
1605         ifmgd->probe_send_count = 0;
1606         ieee80211_mgd_probe_ap_send(sdata);
1607  out:
1608         mutex_unlock(&ifmgd->mtx);
1609 }
1610
1611 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1612                                           struct ieee80211_vif *vif)
1613 {
1614         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1615         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1616         struct sk_buff *skb;
1617         const u8 *ssid;
1618         int ssid_len;
1619
1620         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1621                 return NULL;
1622
1623         ASSERT_MGD_MTX(ifmgd);
1624
1625         if (!ifmgd->associated)
1626                 return NULL;
1627
1628         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1629         if (WARN_ON_ONCE(ssid == NULL))
1630                 ssid_len = 0;
1631         else
1632                 ssid_len = ssid[1];
1633
1634         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1635                                         (u32) -1, ssid + 2, ssid_len,
1636                                         NULL, 0, true);
1637
1638         return skb;
1639 }
1640 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1641
1642 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1643 {
1644         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1645         struct ieee80211_local *local = sdata->local;
1646         u8 bssid[ETH_ALEN];
1647         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1648
1649         mutex_lock(&ifmgd->mtx);
1650         if (!ifmgd->associated) {
1651                 mutex_unlock(&ifmgd->mtx);
1652                 return;
1653         }
1654
1655         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1656
1657         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1658                sdata->name, bssid);
1659
1660         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1661                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1662                                false, frame_buf);
1663         mutex_unlock(&ifmgd->mtx);
1664
1665         /*
1666          * must be outside lock due to cfg80211,
1667          * but that's not a problem.
1668          */
1669         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1670
1671         mutex_lock(&local->mtx);
1672         ieee80211_recalc_idle(local);
1673         mutex_unlock(&local->mtx);
1674 }
1675
1676 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1677 {
1678         struct ieee80211_sub_if_data *sdata =
1679                 container_of(work, struct ieee80211_sub_if_data,
1680                              u.mgd.beacon_connection_loss_work);
1681         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1682         struct sta_info *sta;
1683
1684         if (ifmgd->associated) {
1685                 rcu_read_lock();
1686                 sta = sta_info_get(sdata, ifmgd->bssid);
1687                 if (sta)
1688                         sta->beacon_loss_count++;
1689                 rcu_read_unlock();
1690         }
1691
1692         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1693                 __ieee80211_connection_loss(sdata);
1694         else
1695                 ieee80211_mgd_probe_ap(sdata, true);
1696 }
1697
1698 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1699 {
1700         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1701         struct ieee80211_hw *hw = &sdata->local->hw;
1702
1703         trace_api_beacon_loss(sdata);
1704
1705         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1706         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1707 }
1708 EXPORT_SYMBOL(ieee80211_beacon_loss);
1709
1710 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1711 {
1712         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1713         struct ieee80211_hw *hw = &sdata->local->hw;
1714
1715         trace_api_connection_loss(sdata);
1716
1717         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1718         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1719 }
1720 EXPORT_SYMBOL(ieee80211_connection_loss);
1721
1722
1723 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1724                                         bool assoc)
1725 {
1726         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1727
1728         lockdep_assert_held(&sdata->u.mgd.mtx);
1729
1730         if (!assoc) {
1731                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1732
1733                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1734                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1735         }
1736
1737         cfg80211_put_bss(auth_data->bss);
1738         kfree(auth_data);
1739         sdata->u.mgd.auth_data = NULL;
1740 }
1741
1742 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1743                                      struct ieee80211_mgmt *mgmt, size_t len)
1744 {
1745         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1746         u8 *pos;
1747         struct ieee802_11_elems elems;
1748
1749         pos = mgmt->u.auth.variable;
1750         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1751         if (!elems.challenge)
1752                 return;
1753         auth_data->expected_transaction = 4;
1754         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1755                             elems.challenge - 2, elems.challenge_len + 2,
1756                             auth_data->bss->bssid, auth_data->bss->bssid,
1757                             auth_data->key, auth_data->key_len,
1758                             auth_data->key_idx);
1759 }
1760
1761 static enum rx_mgmt_action __must_check
1762 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1763                        struct ieee80211_mgmt *mgmt, size_t len)
1764 {
1765         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1766         u8 bssid[ETH_ALEN];
1767         u16 auth_alg, auth_transaction, status_code;
1768         struct sta_info *sta;
1769
1770         lockdep_assert_held(&ifmgd->mtx);
1771
1772         if (len < 24 + 6)
1773                 return RX_MGMT_NONE;
1774
1775         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1776                 return RX_MGMT_NONE;
1777
1778         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1779
1780         if (!ether_addr_equal(bssid, mgmt->bssid))
1781                 return RX_MGMT_NONE;
1782
1783         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1784         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1785         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1786
1787         if (auth_alg != ifmgd->auth_data->algorithm ||
1788             auth_transaction != ifmgd->auth_data->expected_transaction)
1789                 return RX_MGMT_NONE;
1790
1791         if (status_code != WLAN_STATUS_SUCCESS) {
1792                 printk(KERN_DEBUG "%s: %pM denied authentication (status %d)\n",
1793                        sdata->name, mgmt->sa, status_code);
1794                 goto out;
1795         }
1796
1797         switch (ifmgd->auth_data->algorithm) {
1798         case WLAN_AUTH_OPEN:
1799         case WLAN_AUTH_LEAP:
1800         case WLAN_AUTH_FT:
1801                 break;
1802         case WLAN_AUTH_SHARED_KEY:
1803                 if (ifmgd->auth_data->expected_transaction != 4) {
1804                         ieee80211_auth_challenge(sdata, mgmt, len);
1805                         /* need another frame */
1806                         return RX_MGMT_NONE;
1807                 }
1808                 break;
1809         default:
1810                 WARN_ONCE(1, "invalid auth alg %d",
1811                           ifmgd->auth_data->algorithm);
1812                 return RX_MGMT_NONE;
1813         }
1814
1815         printk(KERN_DEBUG "%s: authenticated\n", sdata->name);
1816  out:
1817         ifmgd->auth_data->done = true;
1818         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1819         run_again(ifmgd, ifmgd->auth_data->timeout);
1820
1821         /* move station state to auth */
1822         mutex_lock(&sdata->local->sta_mtx);
1823         sta = sta_info_get(sdata, bssid);
1824         if (!sta) {
1825                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1826                 goto out_err;
1827         }
1828         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1829                 printk(KERN_DEBUG "%s: failed moving %pM to auth\n",
1830                        sdata->name, bssid);
1831                 goto out_err;
1832         }
1833         mutex_unlock(&sdata->local->sta_mtx);
1834
1835         return RX_MGMT_CFG80211_RX_AUTH;
1836  out_err:
1837         mutex_unlock(&sdata->local->sta_mtx);
1838         /* ignore frame -- wait for timeout */
1839         return RX_MGMT_NONE;
1840 }
1841
1842
1843 static enum rx_mgmt_action __must_check
1844 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1845                          struct ieee80211_mgmt *mgmt, size_t len)
1846 {
1847         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1848         const u8 *bssid = NULL;
1849         u16 reason_code;
1850
1851         lockdep_assert_held(&ifmgd->mtx);
1852
1853         if (len < 24 + 2)
1854                 return RX_MGMT_NONE;
1855
1856         if (!ifmgd->associated ||
1857             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1858                 return RX_MGMT_NONE;
1859
1860         bssid = ifmgd->associated->bssid;
1861
1862         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1863
1864         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1865                         sdata->name, bssid, reason_code);
1866
1867         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1868
1869         mutex_lock(&sdata->local->mtx);
1870         ieee80211_recalc_idle(sdata->local);
1871         mutex_unlock(&sdata->local->mtx);
1872
1873         return RX_MGMT_CFG80211_DEAUTH;
1874 }
1875
1876
1877 static enum rx_mgmt_action __must_check
1878 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1879                            struct ieee80211_mgmt *mgmt, size_t len)
1880 {
1881         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1882         u16 reason_code;
1883
1884         lockdep_assert_held(&ifmgd->mtx);
1885
1886         if (len < 24 + 2)
1887                 return RX_MGMT_NONE;
1888
1889         if (!ifmgd->associated ||
1890             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1891                 return RX_MGMT_NONE;
1892
1893         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1894
1895         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1896                         sdata->name, mgmt->sa, reason_code);
1897
1898         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1899
1900         mutex_lock(&sdata->local->mtx);
1901         ieee80211_recalc_idle(sdata->local);
1902         mutex_unlock(&sdata->local->mtx);
1903
1904         return RX_MGMT_CFG80211_DISASSOC;
1905 }
1906
1907 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1908                                 u8 *supp_rates, unsigned int supp_rates_len,
1909                                 u32 *rates, u32 *basic_rates,
1910                                 bool *have_higher_than_11mbit,
1911                                 int *min_rate, int *min_rate_index)
1912 {
1913         int i, j;
1914
1915         for (i = 0; i < supp_rates_len; i++) {
1916                 int rate = (supp_rates[i] & 0x7f) * 5;
1917                 bool is_basic = !!(supp_rates[i] & 0x80);
1918
1919                 if (rate > 110)
1920                         *have_higher_than_11mbit = true;
1921
1922                 /*
1923                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1924                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1925                  *
1926                  * Note: Even through the membership selector and the basic
1927                  *       rate flag share the same bit, they are not exactly
1928                  *       the same.
1929                  */
1930                 if (!!(supp_rates[i] & 0x80) &&
1931                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1932                         continue;
1933
1934                 for (j = 0; j < sband->n_bitrates; j++) {
1935                         if (sband->bitrates[j].bitrate == rate) {
1936                                 *rates |= BIT(j);
1937                                 if (is_basic)
1938                                         *basic_rates |= BIT(j);
1939                                 if (rate < *min_rate) {
1940                                         *min_rate = rate;
1941                                         *min_rate_index = j;
1942                                 }
1943                                 break;
1944                         }
1945                 }
1946         }
1947 }
1948
1949 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1950                                          bool assoc)
1951 {
1952         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1953
1954         lockdep_assert_held(&sdata->u.mgd.mtx);
1955
1956         if (!assoc) {
1957                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1958
1959                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1960                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1961         }
1962
1963         kfree(assoc_data);
1964         sdata->u.mgd.assoc_data = NULL;
1965 }
1966
1967 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
1968                                     struct cfg80211_bss *cbss,
1969                                     struct ieee80211_mgmt *mgmt, size_t len)
1970 {
1971         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1972         struct ieee80211_local *local = sdata->local;
1973         struct ieee80211_supported_band *sband;
1974         struct sta_info *sta;
1975         u8 *pos;
1976         u16 capab_info, aid;
1977         struct ieee802_11_elems elems;
1978         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1979         u32 changed = 0;
1980         int err;
1981
1982         /* AssocResp and ReassocResp have identical structure */
1983
1984         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1985         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1986
1987         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1988                 printk(KERN_DEBUG
1989                        "%s: invalid AID value 0x%x; bits 15:14 not set\n",
1990                        sdata->name, aid);
1991         aid &= ~(BIT(15) | BIT(14));
1992
1993         ifmgd->broken_ap = false;
1994
1995         if (aid == 0 || aid > IEEE80211_MAX_AID) {
1996                 printk(KERN_DEBUG
1997                        "%s: invalid AID value %d (out of range), turn off PS\n",
1998                        sdata->name, aid);
1999                 aid = 0;
2000                 ifmgd->broken_ap = true;
2001         }
2002
2003         pos = mgmt->u.assoc_resp.variable;
2004         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2005
2006         if (!elems.supp_rates) {
2007                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
2008                        sdata->name);
2009                 return false;
2010         }
2011
2012         ifmgd->aid = aid;
2013
2014         mutex_lock(&sdata->local->sta_mtx);
2015         /*
2016          * station info was already allocated and inserted before
2017          * the association and should be available to us
2018          */
2019         sta = sta_info_get(sdata, cbss->bssid);
2020         if (WARN_ON(!sta)) {
2021                 mutex_unlock(&sdata->local->sta_mtx);
2022                 return false;
2023         }
2024
2025         sband = local->hw.wiphy->bands[local->oper_channel->band];
2026
2027         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2028                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2029                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2030
2031         sta->supports_40mhz =
2032                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2033
2034         rate_control_rate_init(sta);
2035
2036         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2037                 set_sta_flag(sta, WLAN_STA_MFP);
2038
2039         if (elems.wmm_param)
2040                 set_sta_flag(sta, WLAN_STA_WME);
2041
2042         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2043         if (!err)
2044                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2045         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2046                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2047         if (err) {
2048                 printk(KERN_DEBUG
2049                        "%s: failed to move station %pM to desired state\n",
2050                        sdata->name, sta->sta.addr);
2051                 WARN_ON(__sta_info_destroy(sta));
2052                 mutex_unlock(&sdata->local->sta_mtx);
2053                 return false;
2054         }
2055
2056         mutex_unlock(&sdata->local->sta_mtx);
2057
2058         /*
2059          * Always handle WMM once after association regardless
2060          * of the first value the AP uses. Setting -1 here has
2061          * that effect because the AP values is an unsigned
2062          * 4-bit value.
2063          */
2064         ifmgd->wmm_last_param_set = -1;
2065
2066         if (elems.wmm_param)
2067                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2068                                          elems.wmm_param_len);
2069         else
2070                 ieee80211_set_wmm_default(sdata, false);
2071         changed |= BSS_CHANGED_QOS;
2072
2073         if (elems.ht_operation && elems.wmm_param &&
2074             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2075                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2076                                                   cbss->bssid, false);
2077
2078         /* set AID and assoc capability,
2079          * ieee80211_set_associated() will tell the driver */
2080         bss_conf->aid = aid;
2081         bss_conf->assoc_capability = capab_info;
2082         ieee80211_set_associated(sdata, cbss, changed);
2083
2084         /*
2085          * If we're using 4-addr mode, let the AP know that we're
2086          * doing so, so that it can create the STA VLAN on its side
2087          */
2088         if (ifmgd->use_4addr)
2089                 ieee80211_send_4addr_nullfunc(local, sdata);
2090
2091         /*
2092          * Start timer to probe the connection to the AP now.
2093          * Also start the timer that will detect beacon loss.
2094          */
2095         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2096         ieee80211_sta_reset_beacon_monitor(sdata);
2097
2098         return true;
2099 }
2100
2101 static enum rx_mgmt_action __must_check
2102 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2103                              struct ieee80211_mgmt *mgmt, size_t len,
2104                              struct cfg80211_bss **bss)
2105 {
2106         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2107         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2108         u16 capab_info, status_code, aid;
2109         struct ieee802_11_elems elems;
2110         u8 *pos;
2111         bool reassoc;
2112
2113         lockdep_assert_held(&ifmgd->mtx);
2114
2115         if (!assoc_data)
2116                 return RX_MGMT_NONE;
2117         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2118                 return RX_MGMT_NONE;
2119
2120         /*
2121          * AssocResp and ReassocResp have identical structure, so process both
2122          * of them in this function.
2123          */
2124
2125         if (len < 24 + 6)
2126                 return RX_MGMT_NONE;
2127
2128         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2129         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2130         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2131         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2132
2133         printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x "
2134                "status=%d aid=%d)\n",
2135                sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
2136                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2137
2138         pos = mgmt->u.assoc_resp.variable;
2139         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2140
2141         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2142             elems.timeout_int && elems.timeout_int_len == 5 &&
2143             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2144                 u32 tu, ms;
2145                 tu = get_unaligned_le32(elems.timeout_int + 1);
2146                 ms = tu * 1024 / 1000;
2147                 printk(KERN_DEBUG "%s: %pM rejected association temporarily; "
2148                        "comeback duration %u TU (%u ms)\n",
2149                        sdata->name, mgmt->sa, tu, ms);
2150                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2151                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2152                         run_again(ifmgd, assoc_data->timeout);
2153                 return RX_MGMT_NONE;
2154         }
2155
2156         *bss = assoc_data->bss;
2157
2158         if (status_code != WLAN_STATUS_SUCCESS) {
2159                 printk(KERN_DEBUG "%s: %pM denied association (code=%d)\n",
2160                        sdata->name, mgmt->sa, status_code);
2161                 ieee80211_destroy_assoc_data(sdata, false);
2162         } else {
2163                 printk(KERN_DEBUG "%s: associated\n", sdata->name);
2164
2165                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2166                         /* oops -- internal error -- send timeout for now */
2167                         ieee80211_destroy_assoc_data(sdata, true);
2168                         sta_info_destroy_addr(sdata, mgmt->bssid);
2169                         cfg80211_put_bss(*bss);
2170                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2171                 }
2172
2173                 /*
2174                  * destroy assoc_data afterwards, as otherwise an idle
2175                  * recalc after assoc_data is NULL but before associated
2176                  * is set can cause the interface to go idle
2177                  */
2178                 ieee80211_destroy_assoc_data(sdata, true);
2179         }
2180
2181         return RX_MGMT_CFG80211_RX_ASSOC;
2182 }
2183 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2184                                   struct ieee80211_mgmt *mgmt,
2185                                   size_t len,
2186                                   struct ieee80211_rx_status *rx_status,
2187                                   struct ieee802_11_elems *elems,
2188                                   bool beacon)
2189 {
2190         struct ieee80211_local *local = sdata->local;
2191         int freq;
2192         struct ieee80211_bss *bss;
2193         struct ieee80211_channel *channel;
2194         bool need_ps = false;
2195
2196         if (sdata->u.mgd.associated &&
2197             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2198                 bss = (void *)sdata->u.mgd.associated->priv;
2199                 /* not previously set so we may need to recalc */
2200                 need_ps = !bss->dtim_period;
2201         }
2202
2203         if (elems->ds_params && elems->ds_params_len == 1)
2204                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2205                                                       rx_status->band);
2206         else
2207                 freq = rx_status->freq;
2208
2209         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2210
2211         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2212                 return;
2213
2214         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2215                                         channel, beacon);
2216         if (bss)
2217                 ieee80211_rx_bss_put(local, bss);
2218
2219         if (!sdata->u.mgd.associated)
2220                 return;
2221
2222         if (need_ps) {
2223                 mutex_lock(&local->iflist_mtx);
2224                 ieee80211_recalc_ps(local, -1);
2225                 mutex_unlock(&local->iflist_mtx);
2226         }
2227
2228         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2229             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2230                                                         ETH_ALEN) == 0)) {
2231                 struct ieee80211_channel_sw_ie *sw_elem =
2232                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2233                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2234                                                  bss, rx_status->mactime);
2235         }
2236 }
2237
2238
2239 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2240                                          struct sk_buff *skb)
2241 {
2242         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2243         struct ieee80211_if_managed *ifmgd;
2244         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2245         size_t baselen, len = skb->len;
2246         struct ieee802_11_elems elems;
2247
2248         ifmgd = &sdata->u.mgd;
2249
2250         ASSERT_MGD_MTX(ifmgd);
2251
2252         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2253                 return; /* ignore ProbeResp to foreign address */
2254
2255         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2256         if (baselen > len)
2257                 return;
2258
2259         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2260                                 &elems);
2261
2262         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2263
2264         if (ifmgd->associated &&
2265             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2266                 ieee80211_reset_ap_probe(sdata);
2267
2268         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2269             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2270                 /* got probe response, continue with auth */
2271                 printk(KERN_DEBUG "%s: direct probe responded\n", sdata->name);
2272                 ifmgd->auth_data->tries = 0;
2273                 ifmgd->auth_data->timeout = jiffies;
2274                 run_again(ifmgd, ifmgd->auth_data->timeout);
2275         }
2276 }
2277
2278 /*
2279  * This is the canonical list of information elements we care about,
2280  * the filter code also gives us all changes to the Microsoft OUI
2281  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2282  *
2283  * We implement beacon filtering in software since that means we can
2284  * avoid processing the frame here and in cfg80211, and userspace
2285  * will not be able to tell whether the hardware supports it or not.
2286  *
2287  * XXX: This list needs to be dynamic -- userspace needs to be able to
2288  *      add items it requires. It also needs to be able to tell us to
2289  *      look out for other vendor IEs.
2290  */
2291 static const u64 care_about_ies =
2292         (1ULL << WLAN_EID_COUNTRY) |
2293         (1ULL << WLAN_EID_ERP_INFO) |
2294         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2295         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2296         (1ULL << WLAN_EID_HT_CAPABILITY) |
2297         (1ULL << WLAN_EID_HT_OPERATION);
2298
2299 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2300                                      struct ieee80211_mgmt *mgmt,
2301                                      size_t len,
2302                                      struct ieee80211_rx_status *rx_status)
2303 {
2304         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2305         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2306         size_t baselen;
2307         struct ieee802_11_elems elems;
2308         struct ieee80211_local *local = sdata->local;
2309         u32 changed = 0;
2310         bool erp_valid, directed_tim = false;
2311         u8 erp_value = 0;
2312         u32 ncrc;
2313         u8 *bssid;
2314
2315         lockdep_assert_held(&ifmgd->mtx);
2316
2317         /* Process beacon from the current BSS */
2318         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2319         if (baselen > len)
2320                 return;
2321
2322         if (rx_status->freq != local->hw.conf.channel->center_freq)
2323                 return;
2324
2325         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2326             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2327                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2328                                        len - baselen, &elems);
2329
2330                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2331                                       false);
2332                 ifmgd->assoc_data->have_beacon = true;
2333                 ifmgd->assoc_data->sent_assoc = false;
2334                 /* continue assoc process */
2335                 ifmgd->assoc_data->timeout = jiffies;
2336                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2337                 return;
2338         }
2339
2340         if (!ifmgd->associated ||
2341             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2342                 return;
2343         bssid = ifmgd->associated->bssid;
2344
2345         /* Track average RSSI from the Beacon frames of the current AP */
2346         ifmgd->last_beacon_signal = rx_status->signal;
2347         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2348                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2349                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2350                 ifmgd->last_cqm_event_signal = 0;
2351                 ifmgd->count_beacon_signal = 1;
2352                 ifmgd->last_ave_beacon_signal = 0;
2353         } else {
2354                 ifmgd->ave_beacon_signal =
2355                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2356                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2357                          ifmgd->ave_beacon_signal) / 16;
2358                 ifmgd->count_beacon_signal++;
2359         }
2360
2361         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2362             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2363                 int sig = ifmgd->ave_beacon_signal;
2364                 int last_sig = ifmgd->last_ave_beacon_signal;
2365
2366                 /*
2367                  * if signal crosses either of the boundaries, invoke callback
2368                  * with appropriate parameters
2369                  */
2370                 if (sig > ifmgd->rssi_max_thold &&
2371                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2372                         ifmgd->last_ave_beacon_signal = sig;
2373                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2374                 } else if (sig < ifmgd->rssi_min_thold &&
2375                            (last_sig >= ifmgd->rssi_max_thold ||
2376                            last_sig == 0)) {
2377                         ifmgd->last_ave_beacon_signal = sig;
2378                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2379                 }
2380         }
2381
2382         if (bss_conf->cqm_rssi_thold &&
2383             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2384             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2385                 int sig = ifmgd->ave_beacon_signal / 16;
2386                 int last_event = ifmgd->last_cqm_event_signal;
2387                 int thold = bss_conf->cqm_rssi_thold;
2388                 int hyst = bss_conf->cqm_rssi_hyst;
2389                 if (sig < thold &&
2390                     (last_event == 0 || sig < last_event - hyst)) {
2391                         ifmgd->last_cqm_event_signal = sig;
2392                         ieee80211_cqm_rssi_notify(
2393                                 &sdata->vif,
2394                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2395                                 GFP_KERNEL);
2396                 } else if (sig > thold &&
2397                            (last_event == 0 || sig > last_event + hyst)) {
2398                         ifmgd->last_cqm_event_signal = sig;
2399                         ieee80211_cqm_rssi_notify(
2400                                 &sdata->vif,
2401                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2402                                 GFP_KERNEL);
2403                 }
2404         }
2405
2406         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2407 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2408                 net_dbg_ratelimited("%s: cancelling probereq poll due to a received beacon\n",
2409                                     sdata->name);
2410 #endif
2411                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2412                 mutex_lock(&local->iflist_mtx);
2413                 ieee80211_recalc_ps(local, -1);
2414                 mutex_unlock(&local->iflist_mtx);
2415         }
2416
2417         /*
2418          * Push the beacon loss detection into the future since
2419          * we are processing a beacon from the AP just now.
2420          */
2421         ieee80211_sta_reset_beacon_monitor(sdata);
2422
2423         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2424         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2425                                           len - baselen, &elems,
2426                                           care_about_ies, ncrc);
2427
2428         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2429                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2430                                                    ifmgd->aid);
2431
2432         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
2433                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2434                                       true);
2435
2436                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2437                                          elems.wmm_param_len);
2438         }
2439
2440         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2441                 if (directed_tim) {
2442                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2443                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2444                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2445                                         ieee80211_hw_config(local,
2446                                                             IEEE80211_CONF_CHANGE_PS);
2447                                 }
2448                                 ieee80211_send_nullfunc(local, sdata, 0);
2449                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2450                                 local->pspolling = true;
2451
2452                                 /*
2453                                  * Here is assumed that the driver will be
2454                                  * able to send ps-poll frame and receive a
2455                                  * response even though power save mode is
2456                                  * enabled, but some drivers might require
2457                                  * to disable power save here. This needs
2458                                  * to be investigated.
2459                                  */
2460                                 ieee80211_send_pspoll(local, sdata);
2461                         }
2462                 }
2463         }
2464
2465         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2466                 return;
2467         ifmgd->beacon_crc = ncrc;
2468         ifmgd->beacon_crc_valid = true;
2469
2470         if (elems.erp_info && elems.erp_info_len >= 1) {
2471                 erp_valid = true;
2472                 erp_value = elems.erp_info[0];
2473         } else {
2474                 erp_valid = false;
2475         }
2476         changed |= ieee80211_handle_bss_capability(sdata,
2477                         le16_to_cpu(mgmt->u.beacon.capab_info),
2478                         erp_valid, erp_value);
2479
2480
2481         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2482             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2483                 struct ieee80211_supported_band *sband;
2484
2485                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2486
2487                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2488                                                   bssid, true);
2489         }
2490
2491         /* Note: country IE parsing is done for us by cfg80211 */
2492         if (elems.country_elem) {
2493                 /* TODO: IBSS also needs this */
2494                 if (elems.pwr_constr_elem)
2495                         ieee80211_handle_pwr_constr(sdata,
2496                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2497                                 elems.pwr_constr_elem,
2498                                 elems.pwr_constr_elem_len);
2499         }
2500
2501         ieee80211_bss_info_change_notify(sdata, changed);
2502 }
2503
2504 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2505                                   struct sk_buff *skb)
2506 {
2507         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2508         struct ieee80211_rx_status *rx_status;
2509         struct ieee80211_mgmt *mgmt;
2510         struct cfg80211_bss *bss = NULL;
2511         enum rx_mgmt_action rma = RX_MGMT_NONE;
2512         u16 fc;
2513
2514         rx_status = (struct ieee80211_rx_status *) skb->cb;
2515         mgmt = (struct ieee80211_mgmt *) skb->data;
2516         fc = le16_to_cpu(mgmt->frame_control);
2517
2518         mutex_lock(&ifmgd->mtx);
2519
2520         switch (fc & IEEE80211_FCTL_STYPE) {
2521         case IEEE80211_STYPE_BEACON:
2522                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2523                 break;
2524         case IEEE80211_STYPE_PROBE_RESP:
2525                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2526                 break;
2527         case IEEE80211_STYPE_AUTH:
2528                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2529                 break;
2530         case IEEE80211_STYPE_DEAUTH:
2531                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2532                 break;
2533         case IEEE80211_STYPE_DISASSOC:
2534                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2535                 break;
2536         case IEEE80211_STYPE_ASSOC_RESP:
2537         case IEEE80211_STYPE_REASSOC_RESP:
2538                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2539                 break;
2540         case IEEE80211_STYPE_ACTION:
2541                 switch (mgmt->u.action.category) {
2542                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2543                         ieee80211_sta_process_chanswitch(sdata,
2544                                         &mgmt->u.action.u.chan_switch.sw_elem,
2545                                         (void *)ifmgd->associated->priv,
2546                                         rx_status->mactime);
2547                         break;
2548                 }
2549         }
2550         mutex_unlock(&ifmgd->mtx);
2551
2552         switch (rma) {
2553         case RX_MGMT_NONE:
2554                 /* no action */
2555                 break;
2556         case RX_MGMT_CFG80211_DEAUTH:
2557                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2558                 break;
2559         case RX_MGMT_CFG80211_DISASSOC:
2560                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2561                 break;
2562         case RX_MGMT_CFG80211_RX_AUTH:
2563                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2564                 break;
2565         case RX_MGMT_CFG80211_RX_ASSOC:
2566                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2567                 break;
2568         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2569                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2570                 break;
2571         default:
2572                 WARN(1, "unexpected: %d", rma);
2573         }
2574 }
2575
2576 static void ieee80211_sta_timer(unsigned long data)
2577 {
2578         struct ieee80211_sub_if_data *sdata =
2579                 (struct ieee80211_sub_if_data *) data;
2580         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2581         struct ieee80211_local *local = sdata->local;
2582
2583         if (local->quiescing) {
2584                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2585                 return;
2586         }
2587
2588         ieee80211_queue_work(&local->hw, &sdata->work);
2589 }
2590
2591 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2592                                           u8 *bssid, u8 reason)
2593 {
2594         struct ieee80211_local *local = sdata->local;
2595         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2596         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2597
2598         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2599                           IEEE80211_STA_BEACON_POLL);
2600
2601         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2602                                false, frame_buf);
2603         mutex_unlock(&ifmgd->mtx);
2604
2605         /*
2606          * must be outside lock due to cfg80211,
2607          * but that's not a problem.
2608          */
2609         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2610
2611         mutex_lock(&local->mtx);
2612         ieee80211_recalc_idle(local);
2613         mutex_unlock(&local->mtx);
2614
2615         mutex_lock(&ifmgd->mtx);
2616 }
2617
2618 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2619 {
2620         struct ieee80211_local *local = sdata->local;
2621         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2622         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2623
2624         lockdep_assert_held(&ifmgd->mtx);
2625
2626         if (WARN_ON_ONCE(!auth_data))
2627                 return -EINVAL;
2628
2629         auth_data->tries++;
2630
2631         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2632                 printk(KERN_DEBUG "%s: authentication with %pM timed out\n",
2633                        sdata->name, auth_data->bss->bssid);
2634
2635                 /*
2636                  * Most likely AP is not in the range so remove the
2637                  * bss struct for that AP.
2638                  */
2639                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2640
2641                 return -ETIMEDOUT;
2642         }
2643
2644         if (auth_data->bss->proberesp_ies) {
2645                 printk(KERN_DEBUG "%s: send auth to %pM (try %d/%d)\n",
2646                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2647                        IEEE80211_AUTH_MAX_TRIES);
2648
2649                 auth_data->expected_transaction = 2;
2650                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2651                                     auth_data->ie, auth_data->ie_len,
2652                                     auth_data->bss->bssid,
2653                                     auth_data->bss->bssid, NULL, 0, 0);
2654         } else {
2655                 const u8 *ssidie;
2656
2657                 printk(KERN_DEBUG "%s: direct probe to %pM (try %d/%i)\n",
2658                        sdata->name, auth_data->bss->bssid, auth_data->tries,
2659                        IEEE80211_AUTH_MAX_TRIES);
2660
2661                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2662                 if (!ssidie)
2663                         return -EINVAL;
2664                 /*
2665                  * Direct probe is sent to broadcast address as some APs
2666                  * will not answer to direct packet in unassociated state.
2667                  */
2668                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2669                                          NULL, 0, (u32) -1, true, false);
2670         }
2671
2672         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2673         run_again(ifmgd, auth_data->timeout);
2674
2675         return 0;
2676 }
2677
2678 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2679 {
2680         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2681         struct ieee80211_local *local = sdata->local;
2682
2683         lockdep_assert_held(&sdata->u.mgd.mtx);
2684
2685         assoc_data->tries++;
2686         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2687                 printk(KERN_DEBUG "%s: association with %pM timed out\n",
2688                        sdata->name, assoc_data->bss->bssid);
2689
2690                 /*
2691                  * Most likely AP is not in the range so remove the
2692                  * bss struct for that AP.
2693                  */
2694                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2695
2696                 return -ETIMEDOUT;
2697         }
2698
2699         printk(KERN_DEBUG "%s: associate with %pM (try %d/%d)\n",
2700                sdata->name, assoc_data->bss->bssid, assoc_data->tries,
2701                IEEE80211_ASSOC_MAX_TRIES);
2702         ieee80211_send_assoc(sdata);
2703
2704         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2705         run_again(&sdata->u.mgd, assoc_data->timeout);
2706
2707         return 0;
2708 }
2709
2710 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2711 {
2712         struct ieee80211_local *local = sdata->local;
2713         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2714
2715         mutex_lock(&ifmgd->mtx);
2716
2717         if (ifmgd->auth_data &&
2718             time_after(jiffies, ifmgd->auth_data->timeout)) {
2719                 if (ifmgd->auth_data->done) {
2720                         /*
2721                          * ok ... we waited for assoc but userspace didn't,
2722                          * so let's just kill the auth data
2723                          */
2724                         ieee80211_destroy_auth_data(sdata, false);
2725                 } else if (ieee80211_probe_auth(sdata)) {
2726                         u8 bssid[ETH_ALEN];
2727
2728                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2729
2730                         ieee80211_destroy_auth_data(sdata, false);
2731
2732                         mutex_unlock(&ifmgd->mtx);
2733                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2734                         mutex_lock(&ifmgd->mtx);
2735                 }
2736         } else if (ifmgd->auth_data)
2737                 run_again(ifmgd, ifmgd->auth_data->timeout);
2738
2739         if (ifmgd->assoc_data &&
2740             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2741                 if (!ifmgd->assoc_data->have_beacon ||
2742                     ieee80211_do_assoc(sdata)) {
2743                         u8 bssid[ETH_ALEN];
2744
2745                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2746
2747                         ieee80211_destroy_assoc_data(sdata, false);
2748
2749                         mutex_unlock(&ifmgd->mtx);
2750                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2751                         mutex_lock(&ifmgd->mtx);
2752                 }
2753         } else if (ifmgd->assoc_data)
2754                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2755
2756         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2757                             IEEE80211_STA_CONNECTION_POLL) &&
2758             ifmgd->associated) {
2759                 u8 bssid[ETH_ALEN];
2760                 int max_tries;
2761
2762                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2763
2764                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2765                         max_tries = max_nullfunc_tries;
2766                 else
2767                         max_tries = max_probe_tries;
2768
2769                 /* ACK received for nullfunc probing frame */
2770                 if (!ifmgd->probe_send_count)
2771                         ieee80211_reset_ap_probe(sdata);
2772                 else if (ifmgd->nullfunc_failed) {
2773                         if (ifmgd->probe_send_count < max_tries) {
2774 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2775                                 wiphy_debug(local->hw.wiphy,
2776                                             "%s: No ack for nullfunc frame to"
2777                                             " AP %pM, try %d/%i\n",
2778                                             sdata->name, bssid,
2779                                             ifmgd->probe_send_count, max_tries);
2780 #endif
2781                                 ieee80211_mgd_probe_ap_send(sdata);
2782                         } else {
2783 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2784                                 wiphy_debug(local->hw.wiphy,
2785                                             "%s: No ack for nullfunc frame to"
2786                                             " AP %pM, disconnecting.\n",
2787                                             sdata->name, bssid);
2788 #endif
2789                                 ieee80211_sta_connection_lost(sdata, bssid,
2790                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2791                         }
2792                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2793                         run_again(ifmgd, ifmgd->probe_timeout);
2794                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2795 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2796                         wiphy_debug(local->hw.wiphy,
2797                                     "%s: Failed to send nullfunc to AP %pM"
2798                                     " after %dms, disconnecting.\n",
2799                                     sdata->name,
2800                                     bssid, probe_wait_ms);
2801 #endif
2802                         ieee80211_sta_connection_lost(sdata, bssid,
2803                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2804                 } else if (ifmgd->probe_send_count < max_tries) {
2805 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2806                         wiphy_debug(local->hw.wiphy,
2807                                     "%s: No probe response from AP %pM"
2808                                     " after %dms, try %d/%i\n",
2809                                     sdata->name,
2810                                     bssid, probe_wait_ms,
2811                                     ifmgd->probe_send_count, max_tries);
2812 #endif
2813                         ieee80211_mgd_probe_ap_send(sdata);
2814                 } else {
2815                         /*
2816                          * We actually lost the connection ... or did we?
2817                          * Let's make sure!
2818                          */
2819                         wiphy_debug(local->hw.wiphy,
2820                                     "%s: No probe response from AP %pM"
2821                                     " after %dms, disconnecting.\n",
2822                                     sdata->name,
2823                                     bssid, probe_wait_ms);
2824
2825                         ieee80211_sta_connection_lost(sdata, bssid,
2826                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2827                 }
2828         }
2829
2830         mutex_unlock(&ifmgd->mtx);
2831
2832         mutex_lock(&local->mtx);
2833         ieee80211_recalc_idle(local);
2834         mutex_unlock(&local->mtx);
2835 }
2836
2837 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2838 {
2839         struct ieee80211_sub_if_data *sdata =
2840                 (struct ieee80211_sub_if_data *) data;
2841         struct ieee80211_local *local = sdata->local;
2842
2843         if (local->quiescing)
2844                 return;
2845
2846         ieee80211_queue_work(&sdata->local->hw,
2847                              &sdata->u.mgd.beacon_connection_loss_work);
2848 }
2849
2850 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2851 {
2852         struct ieee80211_sub_if_data *sdata =
2853                 (struct ieee80211_sub_if_data *) data;
2854         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2855         struct ieee80211_local *local = sdata->local;
2856
2857         if (local->quiescing)
2858                 return;
2859
2860         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2861 }
2862
2863 static void ieee80211_sta_monitor_work(struct work_struct *work)
2864 {
2865         struct ieee80211_sub_if_data *sdata =
2866                 container_of(work, struct ieee80211_sub_if_data,
2867                              u.mgd.monitor_work);
2868
2869         ieee80211_mgd_probe_ap(sdata, false);
2870 }
2871
2872 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2873 {
2874         u32 flags;
2875
2876         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2877                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2878                                         IEEE80211_STA_CONNECTION_POLL);
2879
2880                 /* let's probe the connection once */
2881                 flags = sdata->local->hw.flags;
2882                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2883                         ieee80211_queue_work(&sdata->local->hw,
2884                                              &sdata->u.mgd.monitor_work);
2885                 /* and do all the other regular work too */
2886                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2887         }
2888 }
2889
2890 #ifdef CONFIG_PM
2891 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2892 {
2893         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2894
2895         /*
2896          * we need to use atomic bitops for the running bits
2897          * only because both timers might fire at the same
2898          * time -- the code here is properly synchronised.
2899          */
2900
2901         cancel_work_sync(&ifmgd->request_smps_work);
2902
2903         cancel_work_sync(&ifmgd->monitor_work);
2904         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2905         if (del_timer_sync(&ifmgd->timer))
2906                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2907
2908         cancel_work_sync(&ifmgd->chswitch_work);
2909         if (del_timer_sync(&ifmgd->chswitch_timer))
2910                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2911
2912         /* these will just be re-established on connection */
2913         del_timer_sync(&ifmgd->conn_mon_timer);
2914         del_timer_sync(&ifmgd->bcn_mon_timer);
2915 }
2916
2917 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2918 {
2919         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2920
2921         if (!ifmgd->associated)
2922                 return;
2923
2924         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2925                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2926                 mutex_lock(&ifmgd->mtx);
2927                 if (ifmgd->associated) {
2928 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2929                         wiphy_debug(sdata->local->hw.wiphy,
2930                                     "%s: driver requested disconnect after resume.\n",
2931                                     sdata->name);
2932 #endif
2933                         ieee80211_sta_connection_lost(sdata,
2934                                 ifmgd->associated->bssid,
2935                                 WLAN_REASON_UNSPECIFIED);
2936                         mutex_unlock(&ifmgd->mtx);
2937                         return;
2938                 }
2939                 mutex_unlock(&ifmgd->mtx);
2940         }
2941
2942         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2943                 add_timer(&ifmgd->timer);
2944         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2945                 add_timer(&ifmgd->chswitch_timer);
2946         ieee80211_sta_reset_beacon_monitor(sdata);
2947         ieee80211_restart_sta_timer(sdata);
2948 }
2949 #endif
2950
2951 /* interface setup */
2952 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2953 {
2954         struct ieee80211_if_managed *ifmgd;
2955
2956         ifmgd = &sdata->u.mgd;
2957         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2958         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2959         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2960                   ieee80211_beacon_connection_loss_work);
2961         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2962         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2963                     (unsigned long) sdata);
2964         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2965                     (unsigned long) sdata);
2966         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2967                     (unsigned long) sdata);
2968         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2969                     (unsigned long) sdata);
2970
2971         ifmgd->flags = 0;
2972         ifmgd->powersave = sdata->wdev.ps;
2973         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
2974         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
2975
2976         mutex_init(&ifmgd->mtx);
2977
2978         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2979                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2980         else
2981                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2982 }
2983
2984 /* scan finished notification */
2985 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2986 {
2987         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2988
2989         /* Restart STA timers */
2990         rcu_read_lock();
2991         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2992                 ieee80211_restart_sta_timer(sdata);
2993         rcu_read_unlock();
2994 }
2995
2996 int ieee80211_max_network_latency(struct notifier_block *nb,
2997                                   unsigned long data, void *dummy)
2998 {
2999         s32 latency_usec = (s32) data;
3000         struct ieee80211_local *local =
3001                 container_of(nb, struct ieee80211_local,
3002                              network_latency_notifier);
3003
3004         mutex_lock(&local->iflist_mtx);
3005         ieee80211_recalc_ps(local, latency_usec);
3006         mutex_unlock(&local->iflist_mtx);
3007
3008         return 0;
3009 }
3010
3011 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3012                                      struct cfg80211_bss *cbss, bool assoc)
3013 {
3014         struct ieee80211_local *local = sdata->local;
3015         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3016         struct ieee80211_bss *bss = (void *)cbss->priv;
3017         struct sta_info *sta;
3018         bool have_sta = false;
3019         int err;
3020         int ht_cfreq;
3021         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3022         const u8 *ht_oper_ie;
3023         const struct ieee80211_ht_operation *ht_oper = NULL;
3024         struct ieee80211_supported_band *sband;
3025
3026         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3027                 return -EINVAL;
3028
3029         if (assoc) {
3030                 rcu_read_lock();
3031                 have_sta = sta_info_get(sdata, cbss->bssid);
3032                 rcu_read_unlock();
3033         }
3034
3035         if (!have_sta) {
3036                 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3037                 if (!sta)
3038                         return -ENOMEM;
3039         }
3040
3041         mutex_lock(&local->mtx);
3042         ieee80211_recalc_idle(sdata->local);
3043         mutex_unlock(&local->mtx);
3044
3045         /* switch to the right channel */
3046         sband = local->hw.wiphy->bands[cbss->channel->band];
3047
3048         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3049
3050         if (sband->ht_cap.ht_supported) {
3051                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3052                                               cbss->information_elements,
3053                                               cbss->len_information_elements);
3054                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3055                         ht_oper = (void *)(ht_oper_ie + 2);
3056         }
3057
3058         if (ht_oper) {
3059                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3060                                                           cbss->channel->band);
3061                 /* check that channel matches the right operating channel */
3062                 if (cbss->channel->center_freq != ht_cfreq) {
3063                         /*
3064                          * It's possible that some APs are confused here;
3065                          * Netgear WNDR3700 sometimes reports 4 higher than
3066                          * the actual channel in association responses, but
3067                          * since we look at probe response/beacon data here
3068                          * it should be OK.
3069                          */
3070                         printk(KERN_DEBUG
3071                                "%s: Wrong control channel: center-freq: %d"
3072                                " ht-cfreq: %d ht->primary_chan: %d"
3073                                " band: %d. Disabling HT.\n",
3074                                sdata->name, cbss->channel->center_freq,
3075                                ht_cfreq, ht_oper->primary_chan,
3076                                cbss->channel->band);
3077                         ht_oper = NULL;
3078                 }
3079         }
3080
3081         if (ht_oper) {
3082                 channel_type = NL80211_CHAN_HT20;
3083
3084                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3085                         switch (ht_oper->ht_param &
3086                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3087                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3088                                 channel_type = NL80211_CHAN_HT40PLUS;
3089                                 break;
3090                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3091                                 channel_type = NL80211_CHAN_HT40MINUS;
3092                                 break;
3093                         }
3094                 }
3095         }
3096
3097         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3098                 /* can only fail due to HT40+/- mismatch */
3099                 channel_type = NL80211_CHAN_HT20;
3100                 printk(KERN_DEBUG
3101                        "%s: disabling 40 MHz due to multi-vif mismatch\n",
3102                        sdata->name);
3103                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3104                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3105                                                     channel_type));
3106         }
3107
3108         local->oper_channel = cbss->channel;
3109         ieee80211_hw_config(local, 0);
3110
3111         if (!have_sta) {
3112                 u32 rates = 0, basic_rates = 0;
3113                 bool have_higher_than_11mbit;
3114                 int min_rate = INT_MAX, min_rate_index = -1;
3115
3116                 ieee80211_get_rates(sband, bss->supp_rates,
3117                                     bss->supp_rates_len,
3118                                     &rates, &basic_rates,
3119                                     &have_higher_than_11mbit,
3120                                     &min_rate, &min_rate_index);
3121
3122                 /*
3123                  * This used to be a workaround for basic rates missing
3124                  * in the association response frame. Now that we no
3125                  * longer use the basic rates from there, it probably
3126                  * doesn't happen any more, but keep the workaround so
3127                  * in case some *other* APs are buggy in different ways
3128                  * we can connect -- with a warning.
3129                  */
3130                 if (!basic_rates && min_rate_index >= 0) {
3131                         printk(KERN_DEBUG
3132                                "%s: No basic rates, using min rate instead.\n",
3133                                sdata->name);
3134                         basic_rates = BIT(min_rate_index);
3135                 }
3136
3137                 sta->sta.supp_rates[cbss->channel->band] = rates;
3138                 sdata->vif.bss_conf.basic_rates = basic_rates;
3139
3140                 /* cf. IEEE 802.11 9.2.12 */
3141                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3142                     have_higher_than_11mbit)
3143                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3144                 else
3145                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3146
3147                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3148
3149                 /* tell driver about BSSID and basic rates */
3150                 ieee80211_bss_info_change_notify(sdata,
3151                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES);
3152
3153                 if (assoc)
3154                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3155
3156                 err = sta_info_insert(sta);
3157                 sta = NULL;
3158                 if (err) {
3159                         printk(KERN_DEBUG
3160                                "%s: failed to insert STA entry for the AP (error %d)\n",
3161                                sdata->name, err);
3162                         return err;
3163                 }
3164         } else
3165                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3166
3167         return 0;
3168 }
3169
3170 /* config hooks */
3171 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3172                        struct cfg80211_auth_request *req)
3173 {
3174         struct ieee80211_local *local = sdata->local;
3175         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3176         struct ieee80211_mgd_auth_data *auth_data;
3177         u16 auth_alg;
3178         int err;
3179
3180         /* prepare auth data structure */
3181
3182         switch (req->auth_type) {
3183         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3184                 auth_alg = WLAN_AUTH_OPEN;
3185                 break;
3186         case NL80211_AUTHTYPE_SHARED_KEY:
3187                 if (IS_ERR(local->wep_tx_tfm))
3188                         return -EOPNOTSUPP;
3189                 auth_alg = WLAN_AUTH_SHARED_KEY;
3190                 break;
3191         case NL80211_AUTHTYPE_FT:
3192                 auth_alg = WLAN_AUTH_FT;
3193                 break;
3194         case NL80211_AUTHTYPE_NETWORK_EAP:
3195                 auth_alg = WLAN_AUTH_LEAP;
3196                 break;
3197         default:
3198                 return -EOPNOTSUPP;
3199         }
3200
3201         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3202         if (!auth_data)
3203                 return -ENOMEM;
3204
3205         auth_data->bss = req->bss;
3206
3207         if (req->ie && req->ie_len) {
3208                 memcpy(auth_data->ie, req->ie, req->ie_len);
3209                 auth_data->ie_len = req->ie_len;
3210         }
3211
3212         if (req->key && req->key_len) {
3213                 auth_data->key_len = req->key_len;
3214                 auth_data->key_idx = req->key_idx;
3215                 memcpy(auth_data->key, req->key, req->key_len);
3216         }
3217
3218         auth_data->algorithm = auth_alg;
3219
3220         /* try to authenticate/probe */
3221
3222         mutex_lock(&ifmgd->mtx);
3223
3224         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3225             ifmgd->assoc_data) {
3226                 err = -EBUSY;
3227                 goto err_free;
3228         }
3229
3230         if (ifmgd->auth_data)
3231                 ieee80211_destroy_auth_data(sdata, false);
3232
3233         /* prep auth_data so we don't go into idle on disassoc */
3234         ifmgd->auth_data = auth_data;
3235
3236         if (ifmgd->associated)
3237                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3238
3239         printk(KERN_DEBUG "%s: authenticate with %pM\n",
3240                sdata->name, req->bss->bssid);
3241
3242         err = ieee80211_prep_connection(sdata, req->bss, false);
3243         if (err)
3244                 goto err_clear;
3245
3246         err = ieee80211_probe_auth(sdata);
3247         if (err) {
3248                 sta_info_destroy_addr(sdata, req->bss->bssid);
3249                 goto err_clear;
3250         }
3251
3252         /* hold our own reference */
3253         cfg80211_ref_bss(auth_data->bss);
3254         err = 0;
3255         goto out_unlock;
3256
3257  err_clear:
3258         ifmgd->auth_data = NULL;
3259  err_free:
3260         kfree(auth_data);
3261  out_unlock:
3262         mutex_unlock(&ifmgd->mtx);
3263
3264         return err;
3265 }
3266
3267 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3268                         struct cfg80211_assoc_request *req)
3269 {
3270         struct ieee80211_local *local = sdata->local;
3271         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3272         struct ieee80211_bss *bss = (void *)req->bss->priv;
3273         struct ieee80211_mgd_assoc_data *assoc_data;
3274         struct ieee80211_supported_band *sband;
3275         const u8 *ssidie;
3276         int i, err;
3277
3278         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3279         if (!ssidie)
3280                 return -EINVAL;
3281
3282         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3283         if (!assoc_data)
3284                 return -ENOMEM;
3285
3286         mutex_lock(&ifmgd->mtx);
3287
3288         if (ifmgd->associated)
3289                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3290
3291         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3292                 err = -EBUSY;
3293                 goto err_free;
3294         }
3295
3296         if (ifmgd->assoc_data) {
3297                 err = -EBUSY;
3298                 goto err_free;
3299         }
3300
3301         if (ifmgd->auth_data) {
3302                 bool match;
3303
3304                 /* keep sta info, bssid if matching */
3305                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3306                 ieee80211_destroy_auth_data(sdata, match);
3307         }
3308
3309         /* prepare assoc data */
3310
3311         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3312         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3313
3314         ifmgd->beacon_crc_valid = false;
3315
3316         /*
3317          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3318          * We still associate in non-HT mode (11a/b/g) if any one of these
3319          * ciphers is configured as pairwise.
3320          * We can set this to true for non-11n hardware, that'll be checked
3321          * separately along with the peer capabilities.
3322          */
3323         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
3324                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3325                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3326                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
3327                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3328
3329         if (req->flags & ASSOC_REQ_DISABLE_HT)
3330                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3331
3332         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3333         sband = local->hw.wiphy->bands[req->bss->channel->band];
3334         if (!sband->ht_cap.ht_supported ||
3335             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used)
3336                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3337
3338         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3339         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3340                sizeof(ifmgd->ht_capa_mask));
3341
3342         if (req->ie && req->ie_len) {
3343                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3344                 assoc_data->ie_len = req->ie_len;
3345         }
3346
3347         assoc_data->bss = req->bss;
3348
3349         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3350                 if (ifmgd->powersave)
3351                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3352                 else
3353                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3354         } else
3355                 ifmgd->ap_smps = ifmgd->req_smps;
3356
3357         assoc_data->capability = req->bss->capability;
3358         assoc_data->wmm = bss->wmm_used &&
3359                           (local->hw.queues >= IEEE80211_NUM_ACS);
3360         assoc_data->supp_rates = bss->supp_rates;
3361         assoc_data->supp_rates_len = bss->supp_rates_len;
3362         assoc_data->ht_operation_ie =
3363                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3364
3365         if (bss->wmm_used && bss->uapsd_supported &&
3366             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3367                 assoc_data->uapsd = true;
3368                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3369         } else {
3370                 assoc_data->uapsd = false;
3371                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3372         }
3373
3374         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3375         assoc_data->ssid_len = ssidie[1];
3376
3377         if (req->prev_bssid)
3378                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3379
3380         if (req->use_mfp) {
3381                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3382                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3383         } else {
3384                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3385                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3386         }
3387
3388         if (req->crypto.control_port)
3389                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3390         else
3391                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3392
3393         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3394         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3395
3396         /* kick off associate process */
3397
3398         ifmgd->assoc_data = assoc_data;
3399
3400         err = ieee80211_prep_connection(sdata, req->bss, true);
3401         if (err)
3402                 goto err_clear;
3403
3404         if (!bss->dtim_period &&
3405             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3406                 /*
3407                  * Wait up to one beacon interval ...
3408                  * should this be more if we miss one?
3409                  */
3410                 printk(KERN_DEBUG "%s: waiting for beacon from %pM\n",
3411                        sdata->name, ifmgd->bssid);
3412                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3413         } else {
3414                 assoc_data->have_beacon = true;
3415                 assoc_data->sent_assoc = false;
3416                 assoc_data->timeout = jiffies;
3417         }
3418         run_again(ifmgd, assoc_data->timeout);
3419
3420         if (bss->corrupt_data) {
3421                 char *corrupt_type = "data";
3422                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3423                         if (bss->corrupt_data &
3424                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3425                                 corrupt_type = "beacon and probe response";
3426                         else
3427                                 corrupt_type = "beacon";
3428                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3429                         corrupt_type = "probe response";
3430                 printk(KERN_DEBUG "%s: associating with AP with corrupt %s\n",
3431                        sdata->name, corrupt_type);
3432         }
3433
3434         err = 0;
3435         goto out;
3436  err_clear:
3437         ifmgd->assoc_data = NULL;
3438  err_free:
3439         kfree(assoc_data);
3440  out:
3441         mutex_unlock(&ifmgd->mtx);
3442
3443         return err;
3444 }
3445
3446 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3447                          struct cfg80211_deauth_request *req)
3448 {
3449         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3450         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3451
3452         mutex_lock(&ifmgd->mtx);
3453
3454         if (ifmgd->auth_data) {
3455                 ieee80211_destroy_auth_data(sdata, false);
3456                 mutex_unlock(&ifmgd->mtx);
3457                 return 0;
3458         }
3459
3460         printk(KERN_DEBUG
3461                "%s: deauthenticating from %pM by local choice (reason=%d)\n",
3462                sdata->name, req->bssid, req->reason_code);
3463
3464         if (ifmgd->associated &&
3465             ether_addr_equal(ifmgd->associated->bssid, req->bssid))
3466                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3467                                        req->reason_code, true, frame_buf);
3468         else
3469                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3470                                                IEEE80211_STYPE_DEAUTH,
3471                                                req->reason_code, true,
3472                                                frame_buf);
3473         mutex_unlock(&ifmgd->mtx);
3474
3475         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3476
3477         mutex_lock(&sdata->local->mtx);
3478         ieee80211_recalc_idle(sdata->local);
3479         mutex_unlock(&sdata->local->mtx);
3480
3481         return 0;
3482 }
3483
3484 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3485                            struct cfg80211_disassoc_request *req)
3486 {
3487         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3488         u8 bssid[ETH_ALEN];
3489         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3490
3491         mutex_lock(&ifmgd->mtx);
3492
3493         /*
3494          * cfg80211 should catch this ... but it's racy since
3495          * we can receive a disassoc frame, process it, hand it
3496          * to cfg80211 while that's in a locked section already
3497          * trying to tell us that the user wants to disconnect.
3498          */
3499         if (ifmgd->associated != req->bss) {
3500                 mutex_unlock(&ifmgd->mtx);
3501                 return -ENOLINK;
3502         }
3503
3504         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
3505                sdata->name, req->bss->bssid, req->reason_code);
3506
3507         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3508         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3509                                req->reason_code, !req->local_state_change,
3510                                frame_buf);
3511         mutex_unlock(&ifmgd->mtx);
3512
3513         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3514
3515         mutex_lock(&sdata->local->mtx);
3516         ieee80211_recalc_idle(sdata->local);
3517         mutex_unlock(&sdata->local->mtx);
3518
3519         return 0;
3520 }
3521
3522 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3523 {
3524         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3525
3526         mutex_lock(&ifmgd->mtx);
3527         if (ifmgd->assoc_data)
3528                 ieee80211_destroy_assoc_data(sdata, false);
3529         if (ifmgd->auth_data)
3530                 ieee80211_destroy_auth_data(sdata, false);
3531         del_timer_sync(&ifmgd->timer);
3532         mutex_unlock(&ifmgd->mtx);
3533 }
3534
3535 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3536                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3537                                gfp_t gfp)
3538 {
3539         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3540
3541         trace_api_cqm_rssi_notify(sdata, rssi_event);
3542
3543         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3544 }
3545 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
3546
3547 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
3548 {
3549         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3550         return sdata->dev->operstate;
3551 }
3552 EXPORT_SYMBOL(ieee80211_get_operstate);