net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/pm_qos.h>
  22 #include <linux/crc32.h>
  23 #include <linux/slab.h>
  24 #include <linux/export.h>
  25 #include <net/mac80211.h>
  26 #include <asm/unaligned.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "led.h"
  32
  33 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
  34 #define IEEE80211_AUTH_MAX_TRIES 3
  35 #define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
  36 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
  37 #define IEEE80211_ASSOC_MAX_TRIES 3
  38
  39 static int max_nullfunc_tries = 2;
  40 module_param(max_nullfunc_tries, int, 0644);
  41 MODULE_PARM_DESC(max_nullfunc_tries,
  42                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
  43
  44 static int max_probe_tries = 5;
  45 module_param(max_probe_tries, int, 0644);
  46 MODULE_PARM_DESC(max_probe_tries,
  47                  "Maximum probe tries before disconnecting (reason 4).");
  48
  49 /*
  50  * Beacon loss timeout is calculated as N frames times the
  51  * advertised beacon interval.  This may need to be somewhat
  52  * higher than what hardware might detect to account for
  53  * delays in the host processing frames. But since we also
  54  * probe on beacon miss before declaring the connection lost
  55  * default to what we want.
  56  */
  57 #define IEEE80211_BEACON_LOSS_COUNT     7
  58
  59 /*
  60  * Time the connection can be idle before we probe
  61  * it to see if we can still talk to the AP.
  62  */
  63 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  64 /*
  65  * Time we wait for a probe response after sending
  66  * a probe request because of beacon loss or for
  67  * checking the connection still works.
  68  */
  69 static int probe_wait_ms = 500;
  70 module_param(probe_wait_ms, int, 0644);
  71 MODULE_PARM_DESC(probe_wait_ms,
  72                  "Maximum time(ms) to wait for probe response"
  73                  " before disconnecting (reason 4).");
  74
  75 /*
  76  * Weight given to the latest Beacon frame when calculating average signal
  77  * strength for Beacon frames received in the current BSS. This must be
  78  * between 1 and 15.
  79  */
  80 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
  81
  82 /*
  83  * How many Beacon frames need to have been used in average signal strength
  84  * before starting to indicate signal change events.
  85  */
  86 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
  87
  88 #define TMR_RUNNING_TIMER       0
  89 #define TMR_RUNNING_CHANSW      1
  90
  91 #define DEAUTH_DISASSOC_LEN     (24 /* hdr */ + 2 /* reason */)
  92
  93 /*
  94  * All cfg80211 functions have to be called outside a locked
  95  * section so that they can acquire a lock themselves... This
  96  * is much simpler than queuing up things in cfg80211, but we
  97  * do need some indirection for that here.
  98  */
  99 enum rx_mgmt_action {
 100         /* no action required */
 101         RX_MGMT_NONE,
 102
 103         /* caller must call cfg80211_send_deauth() */
 104         RX_MGMT_CFG80211_DEAUTH,
 105
 106         /* caller must call cfg80211_send_disassoc() */
 107         RX_MGMT_CFG80211_DISASSOC,
 108
 109         /* caller must call cfg80211_send_rx_auth() */
 110         RX_MGMT_CFG80211_RX_AUTH,
 111
 112         /* caller must call cfg80211_send_rx_assoc() */
 113         RX_MGMT_CFG80211_RX_ASSOC,
 114
 115         /* caller must call cfg80211_send_assoc_timeout() */
 116         RX_MGMT_CFG80211_ASSOC_TIMEOUT,
 117 };
 118
 119 /* utils */
 120 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 121 {
 122         lockdep_assert_held(&ifmgd->mtx);
 123 }
 124
 125 /*
 126  * We can have multiple work items (and connection probing)
 127  * scheduling this timer, but we need to take care to only
 128  * reschedule it when it should fire _earlier_ than it was
 129  * asked for before, or if it's not pending right now. This
 130  * function ensures that. Note that it then is required to
 131  * run this function for all timeouts after the first one
 132  * has happened -- the work that runs from this timer will
 133  * do that.
 134  */
 135 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
 136 {
 137         ASSERT_MGD_MTX(ifmgd);
 138
 139         if (!timer_pending(&ifmgd->timer) ||
 140             time_before(timeout, ifmgd->timer.expires))
 141                 mod_timer(&ifmgd->timer, timeout);
 142 }
 143
 144 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 145 {
 146         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 147                 return;
 148
 149         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 150                 return;
 151
 152         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 153                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 154 }
 155
 156 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 157 {
 158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 159
 160         if (unlikely(!sdata->u.mgd.associated))
 161                 return;
 162
 163         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 164                 return;
 165
 166         mod_timer(&sdata->u.mgd.conn_mon_timer,
 167                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 168
 169         ifmgd->probe_send_count = 0;
 170 }
 171
 172 static int ecw2cw(int ecw)
 173 {
 174         return (1 << ecw) - 1;
 175 }
 176
 177 static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
 178                                   struct ieee80211_ht_operation *ht_oper,
 179                                   const u8 *bssid, bool reconfig)
 180 {
 181         struct ieee80211_local *local = sdata->local;
 182         struct ieee80211_supported_band *sband;
 183         struct sta_info *sta;
 184         u32 changed = 0;
 185         u16 ht_opmode;
 186         bool disable_40 = false;
 187
 188         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 189
 190         switch (sdata->vif.bss_conf.channel_type) {
 191         case NL80211_CHAN_HT40PLUS:
 192                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
 193                         disable_40 = true;
 194                 break;
 195         case NL80211_CHAN_HT40MINUS:
 196                 if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
 197                         disable_40 = true;
 198                 break;
 199         default:
 200                 break;
 201         }
 202
 203         /* This can change during the lifetime of the BSS */
 204         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 205                 disable_40 = true;
 206
 207         mutex_lock(&local->sta_mtx);
 208         sta = sta_info_get(sdata, bssid);
 209
 210         WARN_ON_ONCE(!sta);
 211
 212         if (sta && !sta->supports_40mhz)
 213                 disable_40 = true;
 214
 215         if (sta && (!reconfig ||
 216                     (disable_40 != !(sta->sta.ht_cap.cap &
 217                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 218
 219                 if (disable_40)
 220                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 221                 else
 222                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 223
 224                 rate_control_rate_update(local, sband, sta,
 225                                          IEEE80211_RC_BW_CHANGED);
 226         }
 227         mutex_unlock(&local->sta_mtx);
 228
 229         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 230
 231         /* if bss configuration changed store the new one */
 232         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 233                 changed |= BSS_CHANGED_HT;
 234                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 235         }
 236
 237         return changed;
 238 }
 239
 240 /* frame sending functions */
 241
 242 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 243                                       struct ieee80211_supported_band *sband,
 244                                       u32 *rates)
 245 {
 246         int i, j, count;
 247         *rates = 0;
 248         count = 0;
 249         for (i = 0; i < supp_rates_len; i++) {
 250                 int rate = (supp_rates[i] & 0x7F) * 5;
 251
 252                 for (j = 0; j < sband->n_bitrates; j++)
 253                         if (sband->bitrates[j].bitrate == rate) {
 254                                 *rates |= BIT(j);
 255                                 count++;
 256                                 break;
 257                         }
 258         }
 259
 260         return count;
 261 }
 262
 263 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 264                                 struct sk_buff *skb, u8 ap_ht_param,
 265                                 struct ieee80211_supported_band *sband,
 266                                 struct ieee80211_channel *channel,
 267                                 enum ieee80211_smps_mode smps)
 268 {
 269         u8 *pos;
 270         u32 flags = channel->flags;
 271         u16 cap;
 272         struct ieee80211_sta_ht_cap ht_cap;
 273
 274         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 275
 276         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 277         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 278
 279         /* determine capability flags */
 280         cap = ht_cap.cap;
 281
 282         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 283         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 284                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 285                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 286                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 287                 }
 288                 break;
 289         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 290                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 291                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 292                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 293                 }
 294                 break;
 295         }
 296
 297         /*
 298          * If 40 MHz was disabled associate as though we weren't
 299          * capable of 40 MHz -- some broken APs will never fall
 300          * back to trying to transmit in 20 MHz.
 301          */
 302         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 303                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 304                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 305         }
 306
 307         /* set SM PS mode properly */
 308         cap &= ~IEEE80211_HT_CAP_SM_PS;
 309         switch (smps) {
 310         case IEEE80211_SMPS_AUTOMATIC:
 311         case IEEE80211_SMPS_NUM_MODES:
 312                 WARN_ON(1);
 313         case IEEE80211_SMPS_OFF:
 314                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 315                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 316                 break;
 317         case IEEE80211_SMPS_STATIC:
 318                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 319                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 320                 break;
 321         case IEEE80211_SMPS_DYNAMIC:
 322                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 323                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 324                 break;
 325         }
 326
 327         /* reserve and fill IE */
 328         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 329         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 330 }
 331
 332 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 333                                  struct sk_buff *skb,
 334                                  struct ieee80211_supported_band *sband)
 335 {
 336         u8 *pos;
 337         u32 cap;
 338         struct ieee80211_sta_vht_cap vht_cap;
 339
 340         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 341
 342         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 343
 344         /* determine capability flags */
 345         cap = vht_cap.cap;
 346
 347         /* reserve and fill IE */
 348         pos = skb_put(skb, sizeof(struct ieee80211_vht_capabilities) + 2);
 349         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 350 }
 351
 352 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 353 {
 354         struct ieee80211_local *local = sdata->local;
 355         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 356         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 357         struct sk_buff *skb;
 358         struct ieee80211_mgmt *mgmt;
 359         u8 *pos, qos_info;
 360         size_t offset = 0, noffset;
 361         int i, count, rates_len, supp_rates_len;
 362         u16 capab;
 363         struct ieee80211_supported_band *sband;
 364         u32 rates = 0;
 365
 366         lockdep_assert_held(&ifmgd->mtx);
 367
 368         sband = local->hw.wiphy->bands[local->oper_channel->band];
 369
 370         if (assoc_data->supp_rates_len) {
 371                 /*
 372                  * Get all rates supported by the device and the AP as
 373                  * some APs don't like getting a superset of their rates
 374                  * in the association request (e.g. D-Link DAP 1353 in
 375                  * b-only mode)...
 376                  */
 377                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 378                                                        assoc_data->supp_rates_len,
 379                                                        sband, &rates);
 380         } else {
 381                 /*
 382                  * In case AP not provide any supported rates information
 383                  * before association, we send information element(s) with
 384                  * all rates that we support.
 385                  */
 386                 rates = ~0;
 387                 rates_len = sband->n_bitrates;
 388         }
 389
 390         skb = alloc_skb(local->hw.extra_tx_headroom +
 391                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 392                         2 + assoc_data->ssid_len + /* SSID */
 393                         4 + rates_len + /* (extended) rates */
 394                         4 + /* power capability */
 395                         2 + 2 * sband->n_channels + /* supported channels */
 396                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 397                         2 + sizeof(struct ieee80211_vht_capabilities) + /* VHT */
 398                         assoc_data->ie_len + /* extra IEs */
 399                         9, /* WMM */
 400                         GFP_KERNEL);
 401         if (!skb)
 402                 return;
 403
 404         skb_reserve(skb, local->hw.extra_tx_headroom);
 405
 406         capab = WLAN_CAPABILITY_ESS;
 407
 408         if (sband->band == IEEE80211_BAND_2GHZ) {
 409                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 410                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 411                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 412                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 413         }
 414
 415         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 416                 capab |= WLAN_CAPABILITY_PRIVACY;
 417
 418         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 419             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 420                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 421
 422         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 423         memset(mgmt, 0, 24);
 424         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 425         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 426         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 427
 428         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 429                 skb_put(skb, 10);
 430                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 431                                                   IEEE80211_STYPE_REASSOC_REQ);
 432                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 433                 mgmt->u.reassoc_req.listen_interval =
 434                                 cpu_to_le16(local->hw.conf.listen_interval);
 435                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 436                        ETH_ALEN);
 437         } else {
 438                 skb_put(skb, 4);
 439                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 440                                                   IEEE80211_STYPE_ASSOC_REQ);
 441                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 442                 mgmt->u.assoc_req.listen_interval =
 443                                 cpu_to_le16(local->hw.conf.listen_interval);
 444         }
 445
 446         /* SSID */
 447         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 448         *pos++ = WLAN_EID_SSID;
 449         *pos++ = assoc_data->ssid_len;
 450         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 451
 452         /* add all rates which were marked to be used above */
 453         supp_rates_len = rates_len;
 454         if (supp_rates_len > 8)
 455                 supp_rates_len = 8;
 456
 457         pos = skb_put(skb, supp_rates_len + 2);
 458         *pos++ = WLAN_EID_SUPP_RATES;
 459         *pos++ = supp_rates_len;
 460
 461         count = 0;
 462         for (i = 0; i < sband->n_bitrates; i++) {
 463                 if (BIT(i) & rates) {
 464                         int rate = sband->bitrates[i].bitrate;
 465                         *pos++ = (u8) (rate / 5);
 466                         if (++count == 8)
 467                                 break;
 468                 }
 469         }
 470
 471         if (rates_len > count) {
 472                 pos = skb_put(skb, rates_len - count + 2);
 473                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 474                 *pos++ = rates_len - count;
 475
 476                 for (i++; i < sband->n_bitrates; i++) {
 477                         if (BIT(i) & rates) {
 478                                 int rate = sband->bitrates[i].bitrate;
 479                                 *pos++ = (u8) (rate / 5);
 480                         }
 481                 }
 482         }
 483
 484         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 485                 /* 1. power capabilities */
 486                 pos = skb_put(skb, 4);
 487                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 488                 *pos++ = 2;
 489                 *pos++ = 0; /* min tx power */
 490                 *pos++ = local->oper_channel->max_power; /* max tx power */
 491
 492                 /* 2. supported channels */
 493                 /* TODO: get this in reg domain format */
 494                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 495                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 496                 *pos++ = 2 * sband->n_channels;
 497                 for (i = 0; i < sband->n_channels; i++) {
 498                         *pos++ = ieee80211_frequency_to_channel(
 499                                         sband->channels[i].center_freq);
 500                         *pos++ = 1; /* one channel in the subband*/
 501                 }
 502         }
 503
 504         /* if present, add any custom IEs that go before HT */
 505         if (assoc_data->ie_len && assoc_data->ie) {
 506                 static const u8 before_ht[] = {
 507                         WLAN_EID_SSID,
 508                         WLAN_EID_SUPP_RATES,
 509                         WLAN_EID_EXT_SUPP_RATES,
 510                         WLAN_EID_PWR_CAPABILITY,
 511                         WLAN_EID_SUPPORTED_CHANNELS,
 512                         WLAN_EID_RSN,
 513                         WLAN_EID_QOS_CAPA,
 514                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 515                         WLAN_EID_MOBILITY_DOMAIN,
 516                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 517                 };
 518                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 519                                              before_ht, ARRAY_SIZE(before_ht),
 520                                              offset);
 521                 pos = skb_put(skb, noffset - offset);
 522                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 523                 offset = noffset;
 524         }
 525
 526         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 527                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 528                                     sband, local->oper_channel, ifmgd->ap_smps);
 529
 530         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 531                 ieee80211_add_vht_ie(sdata, skb, sband);
 532
 533         /* if present, add any custom non-vendor IEs that go after HT */
 534         if (assoc_data->ie_len && assoc_data->ie) {
 535                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 536                                                     assoc_data->ie_len,
 537                                                     offset);
 538                 pos = skb_put(skb, noffset - offset);
 539                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 540                 offset = noffset;
 541         }
 542
 543         if (assoc_data->wmm) {
 544                 if (assoc_data->uapsd) {
 545                         qos_info = ifmgd->uapsd_queues;
 546                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 547                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 548                 } else {
 549                         qos_info = 0;
 550                 }
 551
 552                 pos = skb_put(skb, 9);
 553                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 554                 *pos++ = 7; /* len */
 555                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 556                 *pos++ = 0x50;
 557                 *pos++ = 0xf2;
 558                 *pos++ = 2; /* WME */
 559                 *pos++ = 0; /* WME info */
 560                 *pos++ = 1; /* WME ver */
 561                 *pos++ = qos_info;
 562         }
 563
 564         /* add any remaining custom (i.e. vendor specific here) IEs */
 565         if (assoc_data->ie_len && assoc_data->ie) {
 566                 noffset = assoc_data->ie_len;
 567                 pos = skb_put(skb, noffset - offset);
 568                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 569         }
 570
 571         drv_mgd_prepare_tx(local, sdata);
 572
 573         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 574         ieee80211_tx_skb(sdata, skb);
 575 }
 576
 577 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 578                                            const u8 *bssid, u16 stype,
 579                                            u16 reason, bool send_frame,
 580                                            u8 *frame_buf)
 581 {
 582         struct ieee80211_local *local = sdata->local;
 583         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 584         struct sk_buff *skb;
 585         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
 586
 587         /* build frame */
 588         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 589         mgmt->duration = 0; /* initialize only */
 590         mgmt->seq_ctrl = 0; /* initialize only */
 591         memcpy(mgmt->da, bssid, ETH_ALEN);
 592         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 593         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 594         /* u.deauth.reason_code == u.disassoc.reason_code */
 595         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 596
 597         if (send_frame) {
 598                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 599                                     DEAUTH_DISASSOC_LEN);
 600                 if (!skb)
 601                         return;
 602
 603                 skb_reserve(skb, local->hw.extra_tx_headroom);
 604
 605                 /* copy in frame */
 606                 memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
 607                        mgmt, DEAUTH_DISASSOC_LEN);
 608
 609                 if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 610                         IEEE80211_SKB_CB(skb)->flags |=
 611                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
 612
 613                 drv_mgd_prepare_tx(local, sdata);
 614
 615                 ieee80211_tx_skb(sdata, skb);
 616         }
 617 }
 618
 619 void ieee80211_send_pspoll(struct ieee80211_local *local,
 620                            struct ieee80211_sub_if_data *sdata)
 621 {
 622         struct ieee80211_pspoll *pspoll;
 623         struct sk_buff *skb;
 624
 625         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 626         if (!skb)
 627                 return;
 628
 629         pspoll = (struct ieee80211_pspoll *) skb->data;
 630         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 631
 632         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 633         ieee80211_tx_skb(sdata, skb);
 634 }
 635
 636 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 637                              struct ieee80211_sub_if_data *sdata,
 638                              int powersave)
 639 {
 640         struct sk_buff *skb;
 641         struct ieee80211_hdr_3addr *nullfunc;
 642         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 643
 644         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 645         if (!skb)
 646                 return;
 647
 648         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 649         if (powersave)
 650                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 651
 652         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 653         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 654                             IEEE80211_STA_CONNECTION_POLL))
 655                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 656
 657         ieee80211_tx_skb(sdata, skb);
 658 }
 659
 660 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 661                                           struct ieee80211_sub_if_data *sdata)
 662 {
 663         struct sk_buff *skb;
 664         struct ieee80211_hdr *nullfunc;
 665         __le16 fc;
 666
 667         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 668                 return;
 669
 670         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 671         if (!skb)
 672                 return;
 673
 674         skb_reserve(skb, local->hw.extra_tx_headroom);
 675
 676         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 677         memset(nullfunc, 0, 30);
 678         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 679                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 680         nullfunc->frame_control = fc;
 681         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 682         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 683         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 684         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 685
 686         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 687         ieee80211_tx_skb(sdata, skb);
 688 }
 689
 690 /* spectrum management related things */
 691 static void ieee80211_chswitch_work(struct work_struct *work)
 692 {
 693         struct ieee80211_sub_if_data *sdata =
 694                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 695         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 696
 697         if (!ieee80211_sdata_running(sdata))
 698                 return;
 699
 700         mutex_lock(&ifmgd->mtx);
 701         if (!ifmgd->associated)
 702                 goto out;
 703
 704         sdata->local->oper_channel = sdata->local->csa_channel;
 705         if (!sdata->local->ops->channel_switch) {
 706                 /* call "hw_config" only if doing sw channel switch */
 707                 ieee80211_hw_config(sdata->local,
 708                         IEEE80211_CONF_CHANGE_CHANNEL);
 709         } else {
 710                 /* update the device channel directly */
 711                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 712         }
 713
 714         /* XXX: shouldn't really modify cfg80211-owned data! */
 715         ifmgd->associated->channel = sdata->local->oper_channel;
 716
 717         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 718                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 719  out:
 720         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 721         mutex_unlock(&ifmgd->mtx);
 722 }
 723
 724 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 725 {
 726         struct ieee80211_sub_if_data *sdata;
 727         struct ieee80211_if_managed *ifmgd;
 728
 729         sdata = vif_to_sdata(vif);
 730         ifmgd = &sdata->u.mgd;
 731
 732         trace_api_chswitch_done(sdata, success);
 733         if (!success) {
 734                 /*
 735                  * If the channel switch was not successful, stay
 736                  * around on the old channel. We currently lack
 737                  * good handling of this situation, possibly we
 738                  * should just drop the association.
 739                  */
 740                 sdata->local->csa_channel = sdata->local->oper_channel;
 741         }
 742
 743         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 744 }
 745 EXPORT_SYMBOL(ieee80211_chswitch_done);
 746
 747 static void ieee80211_chswitch_timer(unsigned long data)
 748 {
 749         struct ieee80211_sub_if_data *sdata =
 750                 (struct ieee80211_sub_if_data *) data;
 751         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 752
 753         if (sdata->local->quiescing) {
 754                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 755                 return;
 756         }
 757
 758         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 759 }
 760
 761 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 762                                       struct ieee80211_channel_sw_ie *sw_elem,
 763                                       struct ieee80211_bss *bss,
 764                                       u64 timestamp)
 765 {
 766         struct cfg80211_bss *cbss =
 767                 container_of((void *)bss, struct cfg80211_bss, priv);
 768         struct ieee80211_channel *new_ch;
 769         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 770         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 771                                                       cbss->channel->band);
 772
 773         ASSERT_MGD_MTX(ifmgd);
 774
 775         if (!ifmgd->associated)
 776                 return;
 777
 778         if (sdata->local->scanning)
 779                 return;
 780
 781         /* Disregard subsequent beacons if we are already running a timer
 782            processing a CSA */
 783
 784         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 785                 return;
 786
 787         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 788         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 789                 return;
 790
 791         sdata->local->csa_channel = new_ch;
 792
 793         if (sdata->local->ops->channel_switch) {
 794                 /* use driver's channel switch callback */
 795                 struct ieee80211_channel_switch ch_switch;
 796                 memset(&ch_switch, 0, sizeof(ch_switch));
 797                 ch_switch.timestamp = timestamp;
 798                 if (sw_elem->mode) {
 799                         ch_switch.block_tx = true;
 800                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 801                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 802                 }
 803                 ch_switch.channel = new_ch;
 804                 ch_switch.count = sw_elem->count;
 805                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 806                 drv_channel_switch(sdata->local, &ch_switch);
 807                 return;
 808         }
 809
 810         /* channel switch handled in software */
 811         if (sw_elem->count <= 1) {
 812                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 813         } else {
 814                 if (sw_elem->mode)
 815                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 816                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 817                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 818                 mod_timer(&ifmgd->chswitch_timer,
 819                           jiffies +
 820                           msecs_to_jiffies(sw_elem->count *
 821                                            cbss->beacon_interval));
 822         }
 823 }
 824
 825 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 826                                         u16 capab_info, u8 *pwr_constr_elem,
 827                                         u8 pwr_constr_elem_len)
 828 {
 829         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 830
 831         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 832                 return;
 833
 834         /* Power constraint IE length should be 1 octet */
 835         if (pwr_constr_elem_len != 1)
 836                 return;
 837
 838         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 839             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 840                 sdata->local->power_constr_level = *pwr_constr_elem;
 841                 ieee80211_hw_config(sdata->local, 0);
 842         }
 843 }
 844
 845 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 846 {
 847         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 848         struct ieee80211_local *local = sdata->local;
 849         struct ieee80211_conf *conf = &local->hw.conf;
 850
 851         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 852                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 853                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 854
 855         local->disable_dynamic_ps = false;
 856         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 857 }
 858 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 859
 860 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 861 {
 862         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 863         struct ieee80211_local *local = sdata->local;
 864         struct ieee80211_conf *conf = &local->hw.conf;
 865
 866         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 867                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 868                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 869
 870         local->disable_dynamic_ps = true;
 871         conf->dynamic_ps_timeout = 0;
 872         del_timer_sync(&local->dynamic_ps_timer);
 873         ieee80211_queue_work(&local->hw,
 874                              &local->dynamic_ps_enable_work);
 875 }
 876 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 877
 878 /* powersave */
 879 static void ieee80211_enable_ps(struct ieee80211_local *local,
 880                                 struct ieee80211_sub_if_data *sdata)
 881 {
 882         struct ieee80211_conf *conf = &local->hw.conf;
 883
 884         /*
 885          * If we are scanning right now then the parameters will
 886          * take effect when scan finishes.
 887          */
 888         if (local->scanning)
 889                 return;
 890
 891         if (conf->dynamic_ps_timeout > 0 &&
 892             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 893                 mod_timer(&local->dynamic_ps_timer, jiffies +
 894                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 895         } else {
 896                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 897                         ieee80211_send_nullfunc(local, sdata, 1);
 898
 899                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 900                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 901                         return;
 902
 903                 conf->flags |= IEEE80211_CONF_PS;
 904                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 905         }
 906 }
 907
 908 static void ieee80211_change_ps(struct ieee80211_local *local)
 909 {
 910         struct ieee80211_conf *conf = &local->hw.conf;
 911
 912         if (local->ps_sdata) {
 913                 ieee80211_enable_ps(local, local->ps_sdata);
 914         } else if (conf->flags & IEEE80211_CONF_PS) {
 915                 conf->flags &= ~IEEE80211_CONF_PS;
 916                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 917                 del_timer_sync(&local->dynamic_ps_timer);
 918                 cancel_work_sync(&local->dynamic_ps_enable_work);
 919         }
 920 }
 921
 922 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 923 {
 924         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 925         struct sta_info *sta = NULL;
 926         bool authorized = false;
 927
 928         if (!mgd->powersave)
 929                 return false;
 930
 931         if (mgd->broken_ap)
 932                 return false;
 933
 934         if (!mgd->associated)
 935                 return false;
 936
 937         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 938                           IEEE80211_STA_CONNECTION_POLL))
 939                 return false;
 940
 941         rcu_read_lock();
 942         sta = sta_info_get(sdata, mgd->bssid);
 943         if (sta)
 944                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 945         rcu_read_unlock();
 946
 947         return authorized;
 948 }
 949
 950 /* need to hold RTNL or interface lock */
 951 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 952 {
 953         struct ieee80211_sub_if_data *sdata, *found = NULL;
 954         int count = 0;
 955         int timeout;
 956
 957         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 958                 local->ps_sdata = NULL;
 959                 return;
 960         }
 961
 962         list_for_each_entry(sdata, &local->interfaces, list) {
 963                 if (!ieee80211_sdata_running(sdata))
 964                         continue;
 965                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 966                         /* If an AP vif is found, then disable PS
 967                          * by setting the count to zero thereby setting
 968                          * ps_sdata to NULL.
 969                          */
 970                         count = 0;
 971                         break;
 972                 }
 973                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 974                         continue;
 975                 found = sdata;
 976                 count++;
 977         }
 978
 979         if (count == 1 && ieee80211_powersave_allowed(found)) {
 980                 struct ieee80211_conf *conf = &local->hw.conf;
 981                 s32 beaconint_us;
 982
 983                 if (latency < 0)
 984                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 985
 986                 beaconint_us = ieee80211_tu_to_usec(
 987                                         found->vif.bss_conf.beacon_int);
 988
 989                 timeout = local->dynamic_ps_forced_timeout;
 990                 if (timeout < 0) {
 991                         /*
 992                          * Go to full PSM if the user configures a very low
 993                          * latency requirement.
 994                          * The 2000 second value is there for compatibility
 995                          * until the PM_QOS_NETWORK_LATENCY is configured
 996                          * with real values.
 997                          */
 998                         if (latency > (1900 * USEC_PER_MSEC) &&
 999                             latency != (2000 * USEC_PER_SEC))
1000                                 timeout = 0;
1001                         else
1002                                 timeout = 100;
1003                 }
1004                 local->dynamic_ps_user_timeout = timeout;
1005                 if (!local->disable_dynamic_ps)
1006                         conf->dynamic_ps_timeout =
1007                                 local->dynamic_ps_user_timeout;
1008
1009                 if (beaconint_us > latency) {
1010                         local->ps_sdata = NULL;
1011                 } else {
1012                         struct ieee80211_bss *bss;
1013                         int maxslp = 1;
1014                         u8 dtimper;
1015
1016                         bss = (void *)found->u.mgd.associated->priv;
1017                         dtimper = bss->dtim_period;
1018
1019                         /* If the TIM IE is invalid, pretend the value is 1 */
1020                         if (!dtimper)
1021                                 dtimper = 1;
1022                         else if (dtimper > 1)
1023                                 maxslp = min_t(int, dtimper,
1024                                                     latency / beaconint_us);
1025
1026                         local->hw.conf.max_sleep_period = maxslp;
1027                         local->hw.conf.ps_dtim_period = dtimper;
1028                         local->ps_sdata = found;
1029                 }
1030         } else {
1031                 local->ps_sdata = NULL;
1032         }
1033
1034         ieee80211_change_ps(local);
1035 }
1036
1037 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1038 {
1039         struct ieee80211_local *local =
1040                 container_of(work, struct ieee80211_local,
1041                              dynamic_ps_disable_work);
1042
1043         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1044                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1045                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1046         }
1047
1048         ieee80211_wake_queues_by_reason(&local->hw,
1049                                         IEEE80211_QUEUE_STOP_REASON_PS);
1050 }
1051
1052 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1053 {
1054         struct ieee80211_local *local =
1055                 container_of(work, struct ieee80211_local,
1056                              dynamic_ps_enable_work);
1057         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1058         struct ieee80211_if_managed *ifmgd;
1059         unsigned long flags;
1060         int q;
1061
1062         /* can only happen when PS was just disabled anyway */
1063         if (!sdata)
1064                 return;
1065
1066         ifmgd = &sdata->u.mgd;
1067
1068         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1069                 return;
1070
1071         if (!local->disable_dynamic_ps &&
1072             local->hw.conf.dynamic_ps_timeout > 0) {
1073                 /* don't enter PS if TX frames are pending */
1074                 if (drv_tx_frames_pending(local)) {
1075                         mod_timer(&local->dynamic_ps_timer, jiffies +
1076                                   msecs_to_jiffies(
1077                                   local->hw.conf.dynamic_ps_timeout));
1078                         return;
1079                 }
1080
1081                 /*
1082                  * transmission can be stopped by others which leads to
1083                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1084                  * is not the actual idle state.
1085                  */
1086                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1087                 for (q = 0; q < local->hw.queues; q++) {
1088                         if (local->queue_stop_reasons[q]) {
1089                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1090                                                        flags);
1091                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1092                                           msecs_to_jiffies(
1093                                           local->hw.conf.dynamic_ps_timeout));
1094                                 return;
1095                         }
1096                 }
1097                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1098         }
1099
1100         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1101             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1102                 netif_tx_stop_all_queues(sdata->dev);
1103
1104                 if (drv_tx_frames_pending(local))
1105                         mod_timer(&local->dynamic_ps_timer, jiffies +
1106                                   msecs_to_jiffies(
1107                                   local->hw.conf.dynamic_ps_timeout));
1108                 else {
1109                         ieee80211_send_nullfunc(local, sdata, 1);
1110                         /* Flush to get the tx status of nullfunc frame */
1111                         drv_flush(local, false);
1112                 }
1113         }
1114
1115         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1116               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1117             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1118                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1119                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1120                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1121         }
1122
1123         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1124                 netif_tx_wake_all_queues(sdata->dev);
1125 }
1126
1127 void ieee80211_dynamic_ps_timer(unsigned long data)
1128 {
1129         struct ieee80211_local *local = (void *) data;
1130
1131         if (local->quiescing || local->suspended)
1132                 return;
1133
1134         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1135 }
1136
1137 /* MLME */
1138 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1139                                      struct ieee80211_sub_if_data *sdata,
1140                                      u8 *wmm_param, size_t wmm_param_len)
1141 {
1142         struct ieee80211_tx_queue_params params;
1143         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1144         size_t left;
1145         int count;
1146         u8 *pos, uapsd_queues = 0;
1147
1148         if (!local->ops->conf_tx)
1149                 return false;
1150
1151         if (local->hw.queues < IEEE80211_NUM_ACS)
1152                 return false;
1153
1154         if (!wmm_param)
1155                 return false;
1156
1157         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1158                 return false;
1159
1160         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1161                 uapsd_queues = ifmgd->uapsd_queues;
1162
1163         count = wmm_param[6] & 0x0f;
1164         if (count == ifmgd->wmm_last_param_set)
1165                 return false;
1166         ifmgd->wmm_last_param_set = count;
1167
1168         pos = wmm_param + 8;
1169         left = wmm_param_len - 8;
1170
1171         memset(&params, 0, sizeof(params));
1172
1173         sdata->wmm_acm = 0;
1174         for (; left >= 4; left -= 4, pos += 4) {
1175                 int aci = (pos[0] >> 5) & 0x03;
1176                 int acm = (pos[0] >> 4) & 0x01;
1177                 bool uapsd = false;
1178                 int queue;
1179
1180                 switch (aci) {
1181                 case 1: /* AC_BK */
1182                         queue = 3;
1183                         if (acm)
1184                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1185                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1186                                 uapsd = true;
1187                         break;
1188                 case 2: /* AC_VI */
1189                         queue = 1;
1190                         if (acm)
1191                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1192                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1193                                 uapsd = true;
1194                         break;
1195                 case 3: /* AC_VO */
1196                         queue = 0;
1197                         if (acm)
1198                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1199                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1200                                 uapsd = true;
1201                         break;
1202                 case 0: /* AC_BE */
1203                 default:
1204                         queue = 2;
1205                         if (acm)
1206                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1207                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1208                                 uapsd = true;
1209                         break;
1210                 }
1211
1212                 params.aifs = pos[0] & 0x0f;
1213                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1214                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1215                 params.txop = get_unaligned_le16(pos + 2);
1216                 params.uapsd = uapsd;
1217
1218                 mlme_dbg(sdata,
1219                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1220                          queue, aci, acm,
1221                          params.aifs, params.cw_min, params.cw_max,
1222                          params.txop, params.uapsd);
1223                 sdata->tx_conf[queue] = params;
1224                 if (drv_conf_tx(local, sdata, queue, &params))
1225                         sdata_err(sdata,
1226                                   "failed to set TX queue parameters for queue %d\n",
1227                                   queue);
1228         }
1229
1230         /* enable WMM or activate new settings */
1231         sdata->vif.bss_conf.qos = true;
1232         return true;
1233 }
1234
1235 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1236 {
1237         lockdep_assert_held(&sdata->local->mtx);
1238
1239         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1240                                 IEEE80211_STA_BEACON_POLL);
1241         ieee80211_run_deferred_scan(sdata->local);
1242 }
1243
1244 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1245 {
1246         mutex_lock(&sdata->local->mtx);
1247         __ieee80211_stop_poll(sdata);
1248         mutex_unlock(&sdata->local->mtx);
1249 }
1250
1251 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1252                                            u16 capab, bool erp_valid, u8 erp)
1253 {
1254         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1255         u32 changed = 0;
1256         bool use_protection;
1257         bool use_short_preamble;
1258         bool use_short_slot;
1259
1260         if (erp_valid) {
1261                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1262                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1263         } else {
1264                 use_protection = false;
1265                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1266         }
1267
1268         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1269         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1270                 use_short_slot = true;
1271
1272         if (use_protection != bss_conf->use_cts_prot) {
1273                 bss_conf->use_cts_prot = use_protection;
1274                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1275         }
1276
1277         if (use_short_preamble != bss_conf->use_short_preamble) {
1278                 bss_conf->use_short_preamble = use_short_preamble;
1279                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1280         }
1281
1282         if (use_short_slot != bss_conf->use_short_slot) {
1283                 bss_conf->use_short_slot = use_short_slot;
1284                 changed |= BSS_CHANGED_ERP_SLOT;
1285         }
1286
1287         return changed;
1288 }
1289
1290 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1291                                      struct cfg80211_bss *cbss,
1292                                      u32 bss_info_changed)
1293 {
1294         struct ieee80211_bss *bss = (void *)cbss->priv;
1295         struct ieee80211_local *local = sdata->local;
1296         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1297
1298         bss_info_changed |= BSS_CHANGED_ASSOC;
1299         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1300                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1301
1302         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1303                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1304
1305         sdata->u.mgd.associated = cbss;
1306         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1307
1308         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1309
1310         /* just to be sure */
1311         ieee80211_stop_poll(sdata);
1312
1313         ieee80211_led_assoc(local, 1);
1314
1315         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1316                 bss_conf->dtim_period = bss->dtim_period;
1317         else
1318                 bss_conf->dtim_period = 0;
1319
1320         bss_conf->assoc = 1;
1321
1322         /* Tell the driver to monitor connection quality (if supported) */
1323         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1324             bss_conf->cqm_rssi_thold)
1325                 bss_info_changed |= BSS_CHANGED_CQM;
1326
1327         /* Enable ARP filtering */
1328         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1329                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1330                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1331         }
1332
1333         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1334
1335         mutex_lock(&local->iflist_mtx);
1336         ieee80211_recalc_ps(local, -1);
1337         ieee80211_recalc_smps(local);
1338         mutex_unlock(&local->iflist_mtx);
1339
1340         netif_tx_start_all_queues(sdata->dev);
1341         netif_carrier_on(sdata->dev);
1342 }
1343
1344 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1345                                    u16 stype, u16 reason, bool tx,
1346                                    u8 *frame_buf)
1347 {
1348         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1349         struct ieee80211_local *local = sdata->local;
1350         struct sta_info *sta;
1351         u32 changed = 0;
1352
1353         ASSERT_MGD_MTX(ifmgd);
1354
1355         if (WARN_ON_ONCE(tx && !frame_buf))
1356                 return;
1357
1358         if (WARN_ON(!ifmgd->associated))
1359                 return;
1360
1361         ieee80211_stop_poll(sdata);
1362
1363         ifmgd->associated = NULL;
1364
1365         /*
1366          * we need to commit the associated = NULL change because the
1367          * scan code uses that to determine whether this iface should
1368          * go to/wake up from powersave or not -- and could otherwise
1369          * wake the queues erroneously.
1370          */
1371         smp_mb();
1372
1373         /*
1374          * Thus, we can only afterwards stop the queues -- to account
1375          * for the case where another CPU is finishing a scan at this
1376          * time -- we don't want the scan code to enable queues.
1377          */
1378
1379         netif_tx_stop_all_queues(sdata->dev);
1380         netif_carrier_off(sdata->dev);
1381
1382         mutex_lock(&local->sta_mtx);
1383         sta = sta_info_get(sdata, ifmgd->bssid);
1384         if (sta) {
1385                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1386                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1387         }
1388         mutex_unlock(&local->sta_mtx);
1389
1390         /*
1391          * if we want to get out of ps before disassoc (why?) we have
1392          * to do it before sending disassoc, as otherwise the null-packet
1393          * won't be valid.
1394          */
1395         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1396                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1397                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1398         }
1399         local->ps_sdata = NULL;
1400
1401         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1402         if (tx)
1403                 drv_flush(local, false);
1404
1405         /* deauthenticate/disassociate now */
1406         if (tx || frame_buf)
1407                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1408                                                reason, tx, frame_buf);
1409
1410         /* flush out frame */
1411         if (tx)
1412                 drv_flush(local, false);
1413
1414         /* clear bssid only after building the needed mgmt frames */
1415         memset(ifmgd->bssid, 0, ETH_ALEN);
1416
1417         /* remove AP and TDLS peers */
1418         sta_info_flush(local, sdata);
1419
1420         /* finally reset all BSS / config parameters */
1421         changed |= ieee80211_reset_erp_info(sdata);
1422
1423         ieee80211_led_assoc(local, 0);
1424         changed |= BSS_CHANGED_ASSOC;
1425         sdata->vif.bss_conf.assoc = false;
1426
1427         /* on the next assoc, re-program HT parameters */
1428         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1429         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1430
1431         local->power_constr_level = 0;
1432
1433         del_timer_sync(&local->dynamic_ps_timer);
1434         cancel_work_sync(&local->dynamic_ps_enable_work);
1435
1436         /* Disable ARP filtering */
1437         if (sdata->vif.bss_conf.arp_filter_enabled) {
1438                 sdata->vif.bss_conf.arp_filter_enabled = false;
1439                 changed |= BSS_CHANGED_ARP_FILTER;
1440         }
1441
1442         sdata->vif.bss_conf.qos = false;
1443         changed |= BSS_CHANGED_QOS;
1444
1445         /* The BSSID (not really interesting) and HT changed */
1446         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1447         ieee80211_bss_info_change_notify(sdata, changed);
1448
1449         /* channel(_type) changes are handled by ieee80211_hw_config */
1450         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1451         ieee80211_hw_config(local, 0);
1452
1453         /* disassociated - set to defaults now */
1454         ieee80211_set_wmm_default(sdata, false);
1455
1456         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1457         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1458         del_timer_sync(&sdata->u.mgd.timer);
1459         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1460 }
1461
1462 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1463                              struct ieee80211_hdr *hdr)
1464 {
1465         /*
1466          * We can postpone the mgd.timer whenever receiving unicast frames
1467          * from AP because we know that the connection is working both ways
1468          * at that time. But multicast frames (and hence also beacons) must
1469          * be ignored here, because we need to trigger the timer during
1470          * data idle periods for sending the periodic probe request to the
1471          * AP we're connected to.
1472          */
1473         if (is_multicast_ether_addr(hdr->addr1))
1474                 return;
1475
1476         ieee80211_sta_reset_conn_monitor(sdata);
1477 }
1478
1479 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1480 {
1481         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1482         struct ieee80211_local *local = sdata->local;
1483
1484         mutex_lock(&local->mtx);
1485         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1486                               IEEE80211_STA_CONNECTION_POLL))) {
1487                 mutex_unlock(&local->mtx);
1488                 return;
1489         }
1490
1491         __ieee80211_stop_poll(sdata);
1492
1493         mutex_lock(&local->iflist_mtx);
1494         ieee80211_recalc_ps(local, -1);
1495         mutex_unlock(&local->iflist_mtx);
1496
1497         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1498                 goto out;
1499
1500         /*
1501          * We've received a probe response, but are not sure whether
1502          * we have or will be receiving any beacons or data, so let's
1503          * schedule the timers again, just in case.
1504          */
1505         ieee80211_sta_reset_beacon_monitor(sdata);
1506
1507         mod_timer(&ifmgd->conn_mon_timer,
1508                   round_jiffies_up(jiffies +
1509                                    IEEE80211_CONNECTION_IDLE_TIME));
1510 out:
1511         mutex_unlock(&local->mtx);
1512 }
1513
1514 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1515                              struct ieee80211_hdr *hdr, bool ack)
1516 {
1517         if (!ieee80211_is_data(hdr->frame_control))
1518             return;
1519
1520         if (ack)
1521                 ieee80211_sta_reset_conn_monitor(sdata);
1522
1523         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1524             sdata->u.mgd.probe_send_count > 0) {
1525                 if (ack)
1526                         sdata->u.mgd.probe_send_count = 0;
1527                 else
1528                         sdata->u.mgd.nullfunc_failed = true;
1529                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1530         }
1531 }
1532
1533 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1534 {
1535         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1536         const u8 *ssid;
1537         u8 *dst = ifmgd->associated->bssid;
1538         u8 unicast_limit = max(1, max_probe_tries - 3);
1539
1540         /*
1541          * Try sending broadcast probe requests for the last three
1542          * probe requests after the first ones failed since some
1543          * buggy APs only support broadcast probe requests.
1544          */
1545         if (ifmgd->probe_send_count >= unicast_limit)
1546                 dst = NULL;
1547
1548         /*
1549          * When the hardware reports an accurate Tx ACK status, it's
1550          * better to send a nullfunc frame instead of a probe request,
1551          * as it will kick us off the AP quickly if we aren't associated
1552          * anymore. The timeout will be reset if the frame is ACKed by
1553          * the AP.
1554          */
1555         ifmgd->probe_send_count++;
1556
1557         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1558                 ifmgd->nullfunc_failed = false;
1559                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1560         } else {
1561                 int ssid_len;
1562
1563                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1564                 if (WARN_ON_ONCE(ssid == NULL))
1565                         ssid_len = 0;
1566                 else
1567                         ssid_len = ssid[1];
1568
1569                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1570                                          0, (u32) -1, true, false);
1571         }
1572
1573         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1574         run_again(ifmgd, ifmgd->probe_timeout);
1575         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1576                 drv_flush(sdata->local, false);
1577 }
1578
1579 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1580                                    bool beacon)
1581 {
1582         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1583         bool already = false;
1584
1585         if (!ieee80211_sdata_running(sdata))
1586                 return;
1587
1588         mutex_lock(&ifmgd->mtx);
1589
1590         if (!ifmgd->associated)
1591                 goto out;
1592
1593         mutex_lock(&sdata->local->mtx);
1594
1595         if (sdata->local->tmp_channel || sdata->local->scanning) {
1596                 mutex_unlock(&sdata->local->mtx);
1597                 goto out;
1598         }
1599
1600         if (beacon)
1601                 mlme_dbg_ratelimited(sdata,
1602                                      "detected beacon loss from AP - sending probe request\n");
1603
1604         ieee80211_cqm_rssi_notify(&sdata->vif,
1605                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1606
1607         /*
1608          * The driver/our work has already reported this event or the
1609          * connection monitoring has kicked in and we have already sent
1610          * a probe request. Or maybe the AP died and the driver keeps
1611          * reporting until we disassociate...
1612          *
1613          * In either case we have to ignore the current call to this
1614          * function (except for setting the correct probe reason bit)
1615          * because otherwise we would reset the timer every time and
1616          * never check whether we received a probe response!
1617          */
1618         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1619                             IEEE80211_STA_CONNECTION_POLL))
1620                 already = true;
1621
1622         if (beacon)
1623                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1624         else
1625                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1626
1627         mutex_unlock(&sdata->local->mtx);
1628
1629         if (already)
1630                 goto out;
1631
1632         mutex_lock(&sdata->local->iflist_mtx);
1633         ieee80211_recalc_ps(sdata->local, -1);
1634         mutex_unlock(&sdata->local->iflist_mtx);
1635
1636         ifmgd->probe_send_count = 0;
1637         ieee80211_mgd_probe_ap_send(sdata);
1638  out:
1639         mutex_unlock(&ifmgd->mtx);
1640 }
1641
1642 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1643                                           struct ieee80211_vif *vif)
1644 {
1645         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1646         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1647         struct cfg80211_bss *cbss;
1648         struct sk_buff *skb;
1649         const u8 *ssid;
1650         int ssid_len;
1651
1652         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1653                 return NULL;
1654
1655         ASSERT_MGD_MTX(ifmgd);
1656
1657         if (ifmgd->associated)
1658                 cbss = ifmgd->associated;
1659         else if (ifmgd->auth_data)
1660                 cbss = ifmgd->auth_data->bss;
1661         else if (ifmgd->assoc_data)
1662                 cbss = ifmgd->assoc_data->bss;
1663         else
1664                 return NULL;
1665
1666         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1667         if (WARN_ON_ONCE(ssid == NULL))
1668                 ssid_len = 0;
1669         else
1670                 ssid_len = ssid[1];
1671
1672         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1673                                         (u32) -1, ssid + 2, ssid_len,
1674                                         NULL, 0, true);
1675
1676         return skb;
1677 }
1678 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1679
1680 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1681 {
1682         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1683         struct ieee80211_local *local = sdata->local;
1684         u8 bssid[ETH_ALEN];
1685         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1686
1687         mutex_lock(&ifmgd->mtx);
1688         if (!ifmgd->associated) {
1689                 mutex_unlock(&ifmgd->mtx);
1690                 return;
1691         }
1692
1693         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1694
1695         sdata_info(sdata, "Connection to AP %pM lost\n", bssid);
1696
1697         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1698                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1699                                false, frame_buf);
1700         mutex_unlock(&ifmgd->mtx);
1701
1702         /*
1703          * must be outside lock due to cfg80211,
1704          * but that's not a problem.
1705          */
1706         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1707
1708         mutex_lock(&local->mtx);
1709         ieee80211_recalc_idle(local);
1710         mutex_unlock(&local->mtx);
1711 }
1712
1713 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1714 {
1715         struct ieee80211_sub_if_data *sdata =
1716                 container_of(work, struct ieee80211_sub_if_data,
1717                              u.mgd.beacon_connection_loss_work);
1718         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1719         struct sta_info *sta;
1720
1721         if (ifmgd->associated) {
1722                 rcu_read_lock();
1723                 sta = sta_info_get(sdata, ifmgd->bssid);
1724                 if (sta)
1725                         sta->beacon_loss_count++;
1726                 rcu_read_unlock();
1727         }
1728
1729         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1730                 __ieee80211_connection_loss(sdata);
1731         else
1732                 ieee80211_mgd_probe_ap(sdata, true);
1733 }
1734
1735 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1736 {
1737         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1738         struct ieee80211_hw *hw = &sdata->local->hw;
1739
1740         trace_api_beacon_loss(sdata);
1741
1742         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1743         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1744 }
1745 EXPORT_SYMBOL(ieee80211_beacon_loss);
1746
1747 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1748 {
1749         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1750         struct ieee80211_hw *hw = &sdata->local->hw;
1751
1752         trace_api_connection_loss(sdata);
1753
1754         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1755         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1756 }
1757 EXPORT_SYMBOL(ieee80211_connection_loss);
1758
1759
1760 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1761                                         bool assoc)
1762 {
1763         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1764
1765         lockdep_assert_held(&sdata->u.mgd.mtx);
1766
1767         if (!assoc) {
1768                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1769
1770                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1771                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1772         }
1773
1774         cfg80211_put_bss(auth_data->bss);
1775         kfree(auth_data);
1776         sdata->u.mgd.auth_data = NULL;
1777 }
1778
1779 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1780                                      struct ieee80211_mgmt *mgmt, size_t len)
1781 {
1782         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1783         u8 *pos;
1784         struct ieee802_11_elems elems;
1785
1786         pos = mgmt->u.auth.variable;
1787         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1788         if (!elems.challenge)
1789                 return;
1790         auth_data->expected_transaction = 4;
1791         drv_mgd_prepare_tx(sdata->local, sdata);
1792         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1793                             elems.challenge - 2, elems.challenge_len + 2,
1794                             auth_data->bss->bssid, auth_data->bss->bssid,
1795                             auth_data->key, auth_data->key_len,
1796                             auth_data->key_idx);
1797 }
1798
1799 static enum rx_mgmt_action __must_check
1800 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1801                        struct ieee80211_mgmt *mgmt, size_t len)
1802 {
1803         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1804         u8 bssid[ETH_ALEN];
1805         u16 auth_alg, auth_transaction, status_code;
1806         struct sta_info *sta;
1807
1808         lockdep_assert_held(&ifmgd->mtx);
1809
1810         if (len < 24 + 6)
1811                 return RX_MGMT_NONE;
1812
1813         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1814                 return RX_MGMT_NONE;
1815
1816         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1817
1818         if (!ether_addr_equal(bssid, mgmt->bssid))
1819                 return RX_MGMT_NONE;
1820
1821         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1822         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1823         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1824
1825         if (auth_alg != ifmgd->auth_data->algorithm ||
1826             auth_transaction != ifmgd->auth_data->expected_transaction)
1827                 return RX_MGMT_NONE;
1828
1829         if (status_code != WLAN_STATUS_SUCCESS) {
1830                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1831                            mgmt->sa, status_code);
1832                 ieee80211_destroy_auth_data(sdata, false);
1833                 return RX_MGMT_CFG80211_RX_AUTH;
1834         }
1835
1836         switch (ifmgd->auth_data->algorithm) {
1837         case WLAN_AUTH_OPEN:
1838         case WLAN_AUTH_LEAP:
1839         case WLAN_AUTH_FT:
1840                 break;
1841         case WLAN_AUTH_SHARED_KEY:
1842                 if (ifmgd->auth_data->expected_transaction != 4) {
1843                         ieee80211_auth_challenge(sdata, mgmt, len);
1844                         /* need another frame */
1845                         return RX_MGMT_NONE;
1846                 }
1847                 break;
1848         default:
1849                 WARN_ONCE(1, "invalid auth alg %d",
1850                           ifmgd->auth_data->algorithm);
1851                 return RX_MGMT_NONE;
1852         }
1853
1854         sdata_info(sdata, "authenticated\n");
1855         ifmgd->auth_data->done = true;
1856         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1857         run_again(ifmgd, ifmgd->auth_data->timeout);
1858
1859         /* move station state to auth */
1860         mutex_lock(&sdata->local->sta_mtx);
1861         sta = sta_info_get(sdata, bssid);
1862         if (!sta) {
1863                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1864                 goto out_err;
1865         }
1866         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1867                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1868                 goto out_err;
1869         }
1870         mutex_unlock(&sdata->local->sta_mtx);
1871
1872         return RX_MGMT_CFG80211_RX_AUTH;
1873  out_err:
1874         mutex_unlock(&sdata->local->sta_mtx);
1875         /* ignore frame -- wait for timeout */
1876         return RX_MGMT_NONE;
1877 }
1878
1879
1880 static enum rx_mgmt_action __must_check
1881 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1882                          struct ieee80211_mgmt *mgmt, size_t len)
1883 {
1884         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1885         const u8 *bssid = NULL;
1886         u16 reason_code;
1887
1888         lockdep_assert_held(&ifmgd->mtx);
1889
1890         if (len < 24 + 2)
1891                 return RX_MGMT_NONE;
1892
1893         if (!ifmgd->associated ||
1894             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1895                 return RX_MGMT_NONE;
1896
1897         bssid = ifmgd->associated->bssid;
1898
1899         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1900
1901         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1902                    bssid, reason_code);
1903
1904         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1905
1906         mutex_lock(&sdata->local->mtx);
1907         ieee80211_recalc_idle(sdata->local);
1908         mutex_unlock(&sdata->local->mtx);
1909
1910         return RX_MGMT_CFG80211_DEAUTH;
1911 }
1912
1913
1914 static enum rx_mgmt_action __must_check
1915 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1916                            struct ieee80211_mgmt *mgmt, size_t len)
1917 {
1918         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1919         u16 reason_code;
1920
1921         lockdep_assert_held(&ifmgd->mtx);
1922
1923         if (len < 24 + 2)
1924                 return RX_MGMT_NONE;
1925
1926         if (!ifmgd->associated ||
1927             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1928                 return RX_MGMT_NONE;
1929
1930         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1931
1932         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1933                    mgmt->sa, reason_code);
1934
1935         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1936
1937         mutex_lock(&sdata->local->mtx);
1938         ieee80211_recalc_idle(sdata->local);
1939         mutex_unlock(&sdata->local->mtx);
1940
1941         return RX_MGMT_CFG80211_DISASSOC;
1942 }
1943
1944 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1945                                 u8 *supp_rates, unsigned int supp_rates_len,
1946                                 u32 *rates, u32 *basic_rates,
1947                                 bool *have_higher_than_11mbit,
1948                                 int *min_rate, int *min_rate_index)
1949 {
1950         int i, j;
1951
1952         for (i = 0; i < supp_rates_len; i++) {
1953                 int rate = (supp_rates[i] & 0x7f) * 5;
1954                 bool is_basic = !!(supp_rates[i] & 0x80);
1955
1956                 if (rate > 110)
1957                         *have_higher_than_11mbit = true;
1958
1959                 /*
1960                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1961                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1962                  *
1963                  * Note: Even through the membership selector and the basic
1964                  *       rate flag share the same bit, they are not exactly
1965                  *       the same.
1966                  */
1967                 if (!!(supp_rates[i] & 0x80) &&
1968                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1969                         continue;
1970
1971                 for (j = 0; j < sband->n_bitrates; j++) {
1972                         if (sband->bitrates[j].bitrate == rate) {
1973                                 *rates |= BIT(j);
1974                                 if (is_basic)
1975                                         *basic_rates |= BIT(j);
1976                                 if (rate < *min_rate) {
1977                                         *min_rate = rate;
1978                                         *min_rate_index = j;
1979                                 }
1980                                 break;
1981                         }
1982                 }
1983         }
1984 }
1985
1986 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1987                                          bool assoc)
1988 {
1989         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1990
1991         lockdep_assert_held(&sdata->u.mgd.mtx);
1992
1993         if (!assoc) {
1994                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1995
1996                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1997                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1998         }
1999
2000         kfree(assoc_data);
2001         sdata->u.mgd.assoc_data = NULL;
2002 }
2003
2004 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2005                                     struct cfg80211_bss *cbss,
2006                                     struct ieee80211_mgmt *mgmt, size_t len)
2007 {
2008         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2009         struct ieee80211_local *local = sdata->local;
2010         struct ieee80211_supported_band *sband;
2011         struct sta_info *sta;
2012         u8 *pos;
2013         u16 capab_info, aid;
2014         struct ieee802_11_elems elems;
2015         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2016         u32 changed = 0;
2017         int err;
2018
2019         /* AssocResp and ReassocResp have identical structure */
2020
2021         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2022         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2023
2024         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2025                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2026                            aid);
2027         aid &= ~(BIT(15) | BIT(14));
2028
2029         ifmgd->broken_ap = false;
2030
2031         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2032                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2033                            aid);
2034                 aid = 0;
2035                 ifmgd->broken_ap = true;
2036         }
2037
2038         pos = mgmt->u.assoc_resp.variable;
2039         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2040
2041         if (!elems.supp_rates) {
2042                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2043                 return false;
2044         }
2045
2046         ifmgd->aid = aid;
2047
2048         mutex_lock(&sdata->local->sta_mtx);
2049         /*
2050          * station info was already allocated and inserted before
2051          * the association and should be available to us
2052          */
2053         sta = sta_info_get(sdata, cbss->bssid);
2054         if (WARN_ON(!sta)) {
2055                 mutex_unlock(&sdata->local->sta_mtx);
2056                 return false;
2057         }
2058
2059         sband = local->hw.wiphy->bands[local->oper_channel->band];
2060
2061         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2062                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2063                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2064
2065         sta->supports_40mhz =
2066                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2067
2068         rate_control_rate_init(sta);
2069
2070         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2071                 set_sta_flag(sta, WLAN_STA_MFP);
2072
2073         if (elems.wmm_param)
2074                 set_sta_flag(sta, WLAN_STA_WME);
2075
2076         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2077         if (!err)
2078                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2079         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2080                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2081         if (err) {
2082                 sdata_info(sdata,
2083                            "failed to move station %pM to desired state\n",
2084                            sta->sta.addr);
2085                 WARN_ON(__sta_info_destroy(sta));
2086                 mutex_unlock(&sdata->local->sta_mtx);
2087                 return false;
2088         }
2089
2090         mutex_unlock(&sdata->local->sta_mtx);
2091
2092         /*
2093          * Always handle WMM once after association regardless
2094          * of the first value the AP uses. Setting -1 here has
2095          * that effect because the AP values is an unsigned
2096          * 4-bit value.
2097          */
2098         ifmgd->wmm_last_param_set = -1;
2099
2100         if (elems.wmm_param)
2101                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2102                                          elems.wmm_param_len);
2103         else
2104                 ieee80211_set_wmm_default(sdata, false);
2105         changed |= BSS_CHANGED_QOS;
2106
2107         if (elems.ht_operation && elems.wmm_param &&
2108             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2109                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2110                                                   cbss->bssid, false);
2111
2112         /* set AID and assoc capability,
2113          * ieee80211_set_associated() will tell the driver */
2114         bss_conf->aid = aid;
2115         bss_conf->assoc_capability = capab_info;
2116         ieee80211_set_associated(sdata, cbss, changed);
2117
2118         /*
2119          * If we're using 4-addr mode, let the AP know that we're
2120          * doing so, so that it can create the STA VLAN on its side
2121          */
2122         if (ifmgd->use_4addr)
2123                 ieee80211_send_4addr_nullfunc(local, sdata);
2124
2125         /*
2126          * Start timer to probe the connection to the AP now.
2127          * Also start the timer that will detect beacon loss.
2128          */
2129         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2130         ieee80211_sta_reset_beacon_monitor(sdata);
2131
2132         return true;
2133 }
2134
2135 static enum rx_mgmt_action __must_check
2136 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2137                              struct ieee80211_mgmt *mgmt, size_t len,
2138                              struct cfg80211_bss **bss)
2139 {
2140         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2141         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2142         u16 capab_info, status_code, aid;
2143         struct ieee802_11_elems elems;
2144         u8 *pos;
2145         bool reassoc;
2146
2147         lockdep_assert_held(&ifmgd->mtx);
2148
2149         if (!assoc_data)
2150                 return RX_MGMT_NONE;
2151         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2152                 return RX_MGMT_NONE;
2153
2154         /*
2155          * AssocResp and ReassocResp have identical structure, so process both
2156          * of them in this function.
2157          */
2158
2159         if (len < 24 + 6)
2160                 return RX_MGMT_NONE;
2161
2162         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2163         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2164         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2165         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2166
2167         sdata_info(sdata,
2168                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2169                    reassoc ? "Rea" : "A", mgmt->sa,
2170                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2171
2172         pos = mgmt->u.assoc_resp.variable;
2173         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2174
2175         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2176             elems.timeout_int && elems.timeout_int_len == 5 &&
2177             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2178                 u32 tu, ms;
2179                 tu = get_unaligned_le32(elems.timeout_int + 1);
2180                 ms = tu * 1024 / 1000;
2181                 sdata_info(sdata,
2182                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2183                            mgmt->sa, tu, ms);
2184                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2185                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2186                         run_again(ifmgd, assoc_data->timeout);
2187                 return RX_MGMT_NONE;
2188         }
2189
2190         *bss = assoc_data->bss;
2191
2192         if (status_code != WLAN_STATUS_SUCCESS) {
2193                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2194                            mgmt->sa, status_code);
2195                 ieee80211_destroy_assoc_data(sdata, false);
2196         } else {
2197                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2198                         /* oops -- internal error -- send timeout for now */
2199                         ieee80211_destroy_assoc_data(sdata, false);
2200                         cfg80211_put_bss(*bss);
2201                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2202                 }
2203                 sdata_info(sdata, "associated\n");
2204
2205                 /*
2206                  * destroy assoc_data afterwards, as otherwise an idle
2207                  * recalc after assoc_data is NULL but before associated
2208                  * is set can cause the interface to go idle
2209                  */
2210                 ieee80211_destroy_assoc_data(sdata, true);
2211         }
2212
2213         return RX_MGMT_CFG80211_RX_ASSOC;
2214 }
2215 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2216                                   struct ieee80211_mgmt *mgmt,
2217                                   size_t len,
2218                                   struct ieee80211_rx_status *rx_status,
2219                                   struct ieee802_11_elems *elems,
2220                                   bool beacon)
2221 {
2222         struct ieee80211_local *local = sdata->local;
2223         int freq;
2224         struct ieee80211_bss *bss;
2225         struct ieee80211_channel *channel;
2226         bool need_ps = false;
2227
2228         if (sdata->u.mgd.associated &&
2229             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2230                 bss = (void *)sdata->u.mgd.associated->priv;
2231                 /* not previously set so we may need to recalc */
2232                 need_ps = !bss->dtim_period;
2233         }
2234
2235         if (elems->ds_params && elems->ds_params_len == 1)
2236                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2237                                                       rx_status->band);
2238         else
2239                 freq = rx_status->freq;
2240
2241         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2242
2243         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2244                 return;
2245
2246         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2247                                         channel, beacon);
2248         if (bss)
2249                 ieee80211_rx_bss_put(local, bss);
2250
2251         if (!sdata->u.mgd.associated)
2252                 return;
2253
2254         if (need_ps) {
2255                 mutex_lock(&local->iflist_mtx);
2256                 ieee80211_recalc_ps(local, -1);
2257                 mutex_unlock(&local->iflist_mtx);
2258         }
2259
2260         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2261             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2262                                                         ETH_ALEN) == 0)) {
2263                 struct ieee80211_channel_sw_ie *sw_elem =
2264                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2265                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2266                                                  bss, rx_status->mactime);
2267         }
2268 }
2269
2270
2271 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2272                                          struct sk_buff *skb)
2273 {
2274         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2275         struct ieee80211_if_managed *ifmgd;
2276         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2277         size_t baselen, len = skb->len;
2278         struct ieee802_11_elems elems;
2279
2280         ifmgd = &sdata->u.mgd;
2281
2282         ASSERT_MGD_MTX(ifmgd);
2283
2284         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2285                 return; /* ignore ProbeResp to foreign address */
2286
2287         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2288         if (baselen > len)
2289                 return;
2290
2291         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2292                                 &elems);
2293
2294         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2295
2296         if (ifmgd->associated &&
2297             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2298                 ieee80211_reset_ap_probe(sdata);
2299
2300         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2301             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2302                 /* got probe response, continue with auth */
2303                 sdata_info(sdata, "direct probe responded\n");
2304                 ifmgd->auth_data->tries = 0;
2305                 ifmgd->auth_data->timeout = jiffies;
2306                 run_again(ifmgd, ifmgd->auth_data->timeout);
2307         }
2308 }
2309
2310 /*
2311  * This is the canonical list of information elements we care about,
2312  * the filter code also gives us all changes to the Microsoft OUI
2313  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2314  *
2315  * We implement beacon filtering in software since that means we can
2316  * avoid processing the frame here and in cfg80211, and userspace
2317  * will not be able to tell whether the hardware supports it or not.
2318  *
2319  * XXX: This list needs to be dynamic -- userspace needs to be able to
2320  *      add items it requires. It also needs to be able to tell us to
2321  *      look out for other vendor IEs.
2322  */
2323 static const u64 care_about_ies =
2324         (1ULL << WLAN_EID_COUNTRY) |
2325         (1ULL << WLAN_EID_ERP_INFO) |
2326         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2327         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2328         (1ULL << WLAN_EID_HT_CAPABILITY) |
2329         (1ULL << WLAN_EID_HT_OPERATION);
2330
2331 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2332                                      struct ieee80211_mgmt *mgmt,
2333                                      size_t len,
2334                                      struct ieee80211_rx_status *rx_status)
2335 {
2336         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2337         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2338         size_t baselen;
2339         struct ieee802_11_elems elems;
2340         struct ieee80211_local *local = sdata->local;
2341         u32 changed = 0;
2342         bool erp_valid, directed_tim = false;
2343         u8 erp_value = 0;
2344         u32 ncrc;
2345         u8 *bssid;
2346
2347         lockdep_assert_held(&ifmgd->mtx);
2348
2349         /* Process beacon from the current BSS */
2350         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2351         if (baselen > len)
2352                 return;
2353
2354         if (rx_status->freq != local->hw.conf.channel->center_freq)
2355                 return;
2356
2357         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2358             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2359                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2360                                        len - baselen, &elems);
2361
2362                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2363                                       false);
2364                 ifmgd->assoc_data->have_beacon = true;
2365                 ifmgd->assoc_data->sent_assoc = false;
2366                 /* continue assoc process */
2367                 ifmgd->assoc_data->timeout = jiffies;
2368                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2369                 return;
2370         }
2371
2372         if (!ifmgd->associated ||
2373             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2374                 return;
2375         bssid = ifmgd->associated->bssid;
2376
2377         /* Track average RSSI from the Beacon frames of the current AP */
2378         ifmgd->last_beacon_signal = rx_status->signal;
2379         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2380                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2381                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2382                 ifmgd->last_cqm_event_signal = 0;
2383                 ifmgd->count_beacon_signal = 1;
2384                 ifmgd->last_ave_beacon_signal = 0;
2385         } else {
2386                 ifmgd->ave_beacon_signal =
2387                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2388                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2389                          ifmgd->ave_beacon_signal) / 16;
2390                 ifmgd->count_beacon_signal++;
2391         }
2392
2393         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2394             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2395                 int sig = ifmgd->ave_beacon_signal;
2396                 int last_sig = ifmgd->last_ave_beacon_signal;
2397
2398                 /*
2399                  * if signal crosses either of the boundaries, invoke callback
2400                  * with appropriate parameters
2401                  */
2402                 if (sig > ifmgd->rssi_max_thold &&
2403                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2404                         ifmgd->last_ave_beacon_signal = sig;
2405                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2406                 } else if (sig < ifmgd->rssi_min_thold &&
2407                            (last_sig >= ifmgd->rssi_max_thold ||
2408                            last_sig == 0)) {
2409                         ifmgd->last_ave_beacon_signal = sig;
2410                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2411                 }
2412         }
2413
2414         if (bss_conf->cqm_rssi_thold &&
2415             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2416             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2417                 int sig = ifmgd->ave_beacon_signal / 16;
2418                 int last_event = ifmgd->last_cqm_event_signal;
2419                 int thold = bss_conf->cqm_rssi_thold;
2420                 int hyst = bss_conf->cqm_rssi_hyst;
2421                 if (sig < thold &&
2422                     (last_event == 0 || sig < last_event - hyst)) {
2423                         ifmgd->last_cqm_event_signal = sig;
2424                         ieee80211_cqm_rssi_notify(
2425                                 &sdata->vif,
2426                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2427                                 GFP_KERNEL);
2428                 } else if (sig > thold &&
2429                            (last_event == 0 || sig > last_event + hyst)) {
2430                         ifmgd->last_cqm_event_signal = sig;
2431                         ieee80211_cqm_rssi_notify(
2432                                 &sdata->vif,
2433                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2434                                 GFP_KERNEL);
2435                 }
2436         }
2437
2438         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2439                 mlme_dbg_ratelimited(sdata,
2440                                      "cancelling probereq poll due to a received beacon\n");
2441                 mutex_lock(&local->mtx);
2442                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2443                 ieee80211_run_deferred_scan(local);
2444                 mutex_unlock(&local->mtx);
2445
2446                 mutex_lock(&local->iflist_mtx);
2447                 ieee80211_recalc_ps(local, -1);
2448                 mutex_unlock(&local->iflist_mtx);
2449         }
2450
2451         /*
2452          * Push the beacon loss detection into the future since
2453          * we are processing a beacon from the AP just now.
2454          */
2455         ieee80211_sta_reset_beacon_monitor(sdata);
2456
2457         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2458         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2459                                           len - baselen, &elems,
2460                                           care_about_ies, ncrc);
2461
2462         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2463                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2464                                                    ifmgd->aid);
2465
2466         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2467                 if (directed_tim) {
2468                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2469                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2470                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2471                                         ieee80211_hw_config(local,
2472                                                             IEEE80211_CONF_CHANGE_PS);
2473                                 }
2474                                 ieee80211_send_nullfunc(local, sdata, 0);
2475                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2476                                 local->pspolling = true;
2477
2478                                 /*
2479                                  * Here is assumed that the driver will be
2480                                  * able to send ps-poll frame and receive a
2481                                  * response even though power save mode is
2482                                  * enabled, but some drivers might require
2483                                  * to disable power save here. This needs
2484                                  * to be investigated.
2485                                  */
2486                                 ieee80211_send_pspoll(local, sdata);
2487                         }
2488                 }
2489         }
2490
2491         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2492                 return;
2493         ifmgd->beacon_crc = ncrc;
2494         ifmgd->beacon_crc_valid = true;
2495
2496         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2497                               true);
2498
2499         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2500                                      elems.wmm_param_len))
2501                 changed |= BSS_CHANGED_QOS;
2502
2503         if (elems.erp_info && elems.erp_info_len >= 1) {
2504                 erp_valid = true;
2505                 erp_value = elems.erp_info[0];
2506         } else {
2507                 erp_valid = false;
2508         }
2509         changed |= ieee80211_handle_bss_capability(sdata,
2510                         le16_to_cpu(mgmt->u.beacon.capab_info),
2511                         erp_valid, erp_value);
2512
2513
2514         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2515             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2516                 struct ieee80211_supported_band *sband;
2517
2518                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2519
2520                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2521                                                   bssid, true);
2522         }
2523
2524         /* Note: country IE parsing is done for us by cfg80211 */
2525         if (elems.country_elem) {
2526                 /* TODO: IBSS also needs this */
2527                 if (elems.pwr_constr_elem)
2528                         ieee80211_handle_pwr_constr(sdata,
2529                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2530                                 elems.pwr_constr_elem,
2531                                 elems.pwr_constr_elem_len);
2532         }
2533
2534         ieee80211_bss_info_change_notify(sdata, changed);
2535 }
2536
2537 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2538                                   struct sk_buff *skb)
2539 {
2540         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2541         struct ieee80211_rx_status *rx_status;
2542         struct ieee80211_mgmt *mgmt;
2543         struct cfg80211_bss *bss = NULL;
2544         enum rx_mgmt_action rma = RX_MGMT_NONE;
2545         u16 fc;
2546
2547         rx_status = (struct ieee80211_rx_status *) skb->cb;
2548         mgmt = (struct ieee80211_mgmt *) skb->data;
2549         fc = le16_to_cpu(mgmt->frame_control);
2550
2551         mutex_lock(&ifmgd->mtx);
2552
2553         switch (fc & IEEE80211_FCTL_STYPE) {
2554         case IEEE80211_STYPE_BEACON:
2555                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2556                 break;
2557         case IEEE80211_STYPE_PROBE_RESP:
2558                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2559                 break;
2560         case IEEE80211_STYPE_AUTH:
2561                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2562                 break;
2563         case IEEE80211_STYPE_DEAUTH:
2564                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2565                 break;
2566         case IEEE80211_STYPE_DISASSOC:
2567                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2568                 break;
2569         case IEEE80211_STYPE_ASSOC_RESP:
2570         case IEEE80211_STYPE_REASSOC_RESP:
2571                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2572                 break;
2573         case IEEE80211_STYPE_ACTION:
2574                 switch (mgmt->u.action.category) {
2575                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2576                         ieee80211_sta_process_chanswitch(sdata,
2577                                         &mgmt->u.action.u.chan_switch.sw_elem,
2578                                         (void *)ifmgd->associated->priv,
2579                                         rx_status->mactime);
2580                         break;
2581                 }
2582         }
2583         mutex_unlock(&ifmgd->mtx);
2584
2585         switch (rma) {
2586         case RX_MGMT_NONE:
2587                 /* no action */
2588                 break;
2589         case RX_MGMT_CFG80211_DEAUTH:
2590                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2591                 break;
2592         case RX_MGMT_CFG80211_DISASSOC:
2593                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2594                 break;
2595         case RX_MGMT_CFG80211_RX_AUTH:
2596                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2597                 break;
2598         case RX_MGMT_CFG80211_RX_ASSOC:
2599                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2600                 break;
2601         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2602                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2603                 break;
2604         default:
2605                 WARN(1, "unexpected: %d", rma);
2606         }
2607 }
2608
2609 static void ieee80211_sta_timer(unsigned long data)
2610 {
2611         struct ieee80211_sub_if_data *sdata =
2612                 (struct ieee80211_sub_if_data *) data;
2613         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2614         struct ieee80211_local *local = sdata->local;
2615
2616         if (local->quiescing) {
2617                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2618                 return;
2619         }
2620
2621         ieee80211_queue_work(&local->hw, &sdata->work);
2622 }
2623
2624 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2625                                           u8 *bssid, u8 reason)
2626 {
2627         struct ieee80211_local *local = sdata->local;
2628         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2629         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2630
2631         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2632                                false, frame_buf);
2633         mutex_unlock(&ifmgd->mtx);
2634
2635         /*
2636          * must be outside lock due to cfg80211,
2637          * but that's not a problem.
2638          */
2639         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2640
2641         mutex_lock(&local->mtx);
2642         ieee80211_recalc_idle(local);
2643         mutex_unlock(&local->mtx);
2644
2645         mutex_lock(&ifmgd->mtx);
2646 }
2647
2648 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2649 {
2650         struct ieee80211_local *local = sdata->local;
2651         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2652         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2653
2654         lockdep_assert_held(&ifmgd->mtx);
2655
2656         if (WARN_ON_ONCE(!auth_data))
2657                 return -EINVAL;
2658
2659         auth_data->tries++;
2660
2661         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2662                 sdata_info(sdata, "authentication with %pM timed out\n",
2663                            auth_data->bss->bssid);
2664
2665                 /*
2666                  * Most likely AP is not in the range so remove the
2667                  * bss struct for that AP.
2668                  */
2669                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2670
2671                 return -ETIMEDOUT;
2672         }
2673
2674         drv_mgd_prepare_tx(local, sdata);
2675
2676         if (auth_data->bss->proberesp_ies) {
2677                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2678                            auth_data->bss->bssid, auth_data->tries,
2679                            IEEE80211_AUTH_MAX_TRIES);
2680
2681                 auth_data->expected_transaction = 2;
2682                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2683                                     auth_data->ie, auth_data->ie_len,
2684                                     auth_data->bss->bssid,
2685                                     auth_data->bss->bssid, NULL, 0, 0);
2686         } else {
2687                 const u8 *ssidie;
2688
2689                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2690                            auth_data->bss->bssid, auth_data->tries,
2691                            IEEE80211_AUTH_MAX_TRIES);
2692
2693                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2694                 if (!ssidie)
2695                         return -EINVAL;
2696                 /*
2697                  * Direct probe is sent to broadcast address as some APs
2698                  * will not answer to direct packet in unassociated state.
2699                  */
2700                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2701                                          NULL, 0, (u32) -1, true, false);
2702         }
2703
2704         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2705         run_again(ifmgd, auth_data->timeout);
2706
2707         return 0;
2708 }
2709
2710 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2711 {
2712         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2713         struct ieee80211_local *local = sdata->local;
2714
2715         lockdep_assert_held(&sdata->u.mgd.mtx);
2716
2717         assoc_data->tries++;
2718         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2719                 sdata_info(sdata, "association with %pM timed out\n",
2720                            assoc_data->bss->bssid);
2721
2722                 /*
2723                  * Most likely AP is not in the range so remove the
2724                  * bss struct for that AP.
2725                  */
2726                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2727
2728                 return -ETIMEDOUT;
2729         }
2730
2731         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2732                    assoc_data->bss->bssid, assoc_data->tries,
2733                    IEEE80211_ASSOC_MAX_TRIES);
2734         ieee80211_send_assoc(sdata);
2735
2736         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2737         run_again(&sdata->u.mgd, assoc_data->timeout);
2738
2739         return 0;
2740 }
2741
2742 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2743 {
2744         struct ieee80211_local *local = sdata->local;
2745         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2746
2747         mutex_lock(&ifmgd->mtx);
2748
2749         if (ifmgd->auth_data &&
2750             time_after(jiffies, ifmgd->auth_data->timeout)) {
2751                 if (ifmgd->auth_data->done) {
2752                         /*
2753                          * ok ... we waited for assoc but userspace didn't,
2754                          * so let's just kill the auth data
2755                          */
2756                         ieee80211_destroy_auth_data(sdata, false);
2757                 } else if (ieee80211_probe_auth(sdata)) {
2758                         u8 bssid[ETH_ALEN];
2759
2760                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2761
2762                         ieee80211_destroy_auth_data(sdata, false);
2763
2764                         mutex_unlock(&ifmgd->mtx);
2765                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2766                         mutex_lock(&ifmgd->mtx);
2767                 }
2768         } else if (ifmgd->auth_data)
2769                 run_again(ifmgd, ifmgd->auth_data->timeout);
2770
2771         if (ifmgd->assoc_data &&
2772             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2773                 if (!ifmgd->assoc_data->have_beacon ||
2774                     ieee80211_do_assoc(sdata)) {
2775                         u8 bssid[ETH_ALEN];
2776
2777                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2778
2779                         ieee80211_destroy_assoc_data(sdata, false);
2780
2781                         mutex_unlock(&ifmgd->mtx);
2782                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2783                         mutex_lock(&ifmgd->mtx);
2784                 }
2785         } else if (ifmgd->assoc_data)
2786                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2787
2788         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2789                             IEEE80211_STA_CONNECTION_POLL) &&
2790             ifmgd->associated) {
2791                 u8 bssid[ETH_ALEN];
2792                 int max_tries;
2793
2794                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2795
2796                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2797                         max_tries = max_nullfunc_tries;
2798                 else
2799                         max_tries = max_probe_tries;
2800
2801                 /* ACK received for nullfunc probing frame */
2802                 if (!ifmgd->probe_send_count)
2803                         ieee80211_reset_ap_probe(sdata);
2804                 else if (ifmgd->nullfunc_failed) {
2805                         if (ifmgd->probe_send_count < max_tries) {
2806                                 mlme_dbg(sdata,
2807                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2808                                          bssid, ifmgd->probe_send_count,
2809                                          max_tries);
2810                                 ieee80211_mgd_probe_ap_send(sdata);
2811                         } else {
2812                                 mlme_dbg(sdata,
2813                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2814                                          bssid);
2815                                 ieee80211_sta_connection_lost(sdata, bssid,
2816                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2817                         }
2818                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2819                         run_again(ifmgd, ifmgd->probe_timeout);
2820                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2821                         mlme_dbg(sdata,
2822                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2823                                  bssid, probe_wait_ms);
2824                         ieee80211_sta_connection_lost(sdata, bssid,
2825                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2826                 } else if (ifmgd->probe_send_count < max_tries) {
2827                         mlme_dbg(sdata,
2828                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2829                                  bssid, probe_wait_ms,
2830                                  ifmgd->probe_send_count, max_tries);
2831                         ieee80211_mgd_probe_ap_send(sdata);
2832                 } else {
2833                         /*
2834                          * We actually lost the connection ... or did we?
2835                          * Let's make sure!
2836                          */
2837                         wiphy_debug(local->hw.wiphy,
2838                                     "%s: No probe response from AP %pM"
2839                                     " after %dms, disconnecting.\n",
2840                                     sdata->name,
2841                                     bssid, probe_wait_ms);
2842
2843                         ieee80211_sta_connection_lost(sdata, bssid,
2844                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2845                 }
2846         }
2847
2848         mutex_unlock(&ifmgd->mtx);
2849
2850         mutex_lock(&local->mtx);
2851         ieee80211_recalc_idle(local);
2852         mutex_unlock(&local->mtx);
2853 }
2854
2855 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2856 {
2857         struct ieee80211_sub_if_data *sdata =
2858                 (struct ieee80211_sub_if_data *) data;
2859         struct ieee80211_local *local = sdata->local;
2860
2861         if (local->quiescing)
2862                 return;
2863
2864         ieee80211_queue_work(&sdata->local->hw,
2865                              &sdata->u.mgd.beacon_connection_loss_work);
2866 }
2867
2868 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2869 {
2870         struct ieee80211_sub_if_data *sdata =
2871                 (struct ieee80211_sub_if_data *) data;
2872         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2873         struct ieee80211_local *local = sdata->local;
2874
2875         if (local->quiescing)
2876                 return;
2877
2878         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2879 }
2880
2881 static void ieee80211_sta_monitor_work(struct work_struct *work)
2882 {
2883         struct ieee80211_sub_if_data *sdata =
2884                 container_of(work, struct ieee80211_sub_if_data,
2885                              u.mgd.monitor_work);
2886
2887         ieee80211_mgd_probe_ap(sdata, false);
2888 }
2889
2890 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2891 {
2892         u32 flags;
2893
2894         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2895                 __ieee80211_stop_poll(sdata);
2896
2897                 /* let's probe the connection once */
2898                 flags = sdata->local->hw.flags;
2899                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2900                         ieee80211_queue_work(&sdata->local->hw,
2901                                              &sdata->u.mgd.monitor_work);
2902                 /* and do all the other regular work too */
2903                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2904         }
2905 }
2906
2907 #ifdef CONFIG_PM
2908 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2909 {
2910         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2911
2912         /*
2913          * we need to use atomic bitops for the running bits
2914          * only because both timers might fire at the same
2915          * time -- the code here is properly synchronised.
2916          */
2917
2918         cancel_work_sync(&ifmgd->request_smps_work);
2919
2920         cancel_work_sync(&ifmgd->monitor_work);
2921         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2922         if (del_timer_sync(&ifmgd->timer))
2923                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2924
2925         cancel_work_sync(&ifmgd->chswitch_work);
2926         if (del_timer_sync(&ifmgd->chswitch_timer))
2927                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2928
2929         /* these will just be re-established on connection */
2930         del_timer_sync(&ifmgd->conn_mon_timer);
2931         del_timer_sync(&ifmgd->bcn_mon_timer);
2932 }
2933
2934 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2935 {
2936         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2937
2938         if (!ifmgd->associated)
2939                 return;
2940
2941         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2942                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2943                 mutex_lock(&ifmgd->mtx);
2944                 if (ifmgd->associated) {
2945                         mlme_dbg(sdata,
2946                                  "driver requested disconnect after resume\n");
2947                         ieee80211_sta_connection_lost(sdata,
2948                                 ifmgd->associated->bssid,
2949                                 WLAN_REASON_UNSPECIFIED);
2950                         mutex_unlock(&ifmgd->mtx);
2951                         return;
2952                 }
2953                 mutex_unlock(&ifmgd->mtx);
2954         }
2955
2956         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2957                 add_timer(&ifmgd->timer);
2958         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2959                 add_timer(&ifmgd->chswitch_timer);
2960         ieee80211_sta_reset_beacon_monitor(sdata);
2961
2962         mutex_lock(&sdata->local->mtx);
2963         ieee80211_restart_sta_timer(sdata);
2964         mutex_unlock(&sdata->local->mtx);
2965 }
2966 #endif
2967
2968 /* interface setup */
2969 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2970 {
2971         struct ieee80211_if_managed *ifmgd;
2972
2973         ifmgd = &sdata->u.mgd;
2974         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2975         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2976         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2977                   ieee80211_beacon_connection_loss_work);
2978         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2979         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2980                     (unsigned long) sdata);
2981         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2982                     (unsigned long) sdata);
2983         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2984                     (unsigned long) sdata);
2985         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2986                     (unsigned long) sdata);
2987
2988         ifmgd->flags = 0;
2989         ifmgd->powersave = sdata->wdev.ps;
2990         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
2991         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
2992
2993         mutex_init(&ifmgd->mtx);
2994
2995         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2996                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2997         else
2998                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2999 }
3000
3001 /* scan finished notification */
3002 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3003 {
3004         struct ieee80211_sub_if_data *sdata;
3005
3006         /* Restart STA timers */
3007         rcu_read_lock();
3008         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3009                 ieee80211_restart_sta_timer(sdata);
3010         rcu_read_unlock();
3011 }
3012
3013 int ieee80211_max_network_latency(struct notifier_block *nb,
3014                                   unsigned long data, void *dummy)
3015 {
3016         s32 latency_usec = (s32) data;
3017         struct ieee80211_local *local =
3018                 container_of(nb, struct ieee80211_local,
3019                              network_latency_notifier);
3020
3021         mutex_lock(&local->iflist_mtx);
3022         ieee80211_recalc_ps(local, latency_usec);
3023         mutex_unlock(&local->iflist_mtx);
3024
3025         return 0;
3026 }
3027
3028 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3029                                      struct cfg80211_bss *cbss, bool assoc)
3030 {
3031         struct ieee80211_local *local = sdata->local;
3032         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3033         struct ieee80211_bss *bss = (void *)cbss->priv;
3034         struct sta_info *sta = NULL;
3035         bool have_sta = false;
3036         int err;
3037         int ht_cfreq;
3038         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3039         const u8 *ht_oper_ie;
3040         const struct ieee80211_ht_operation *ht_oper = NULL;
3041         struct ieee80211_supported_band *sband;
3042
3043         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3044                 return -EINVAL;
3045
3046         if (assoc) {
3047                 rcu_read_lock();
3048                 have_sta = sta_info_get(sdata, cbss->bssid);
3049                 rcu_read_unlock();
3050         }
3051
3052         if (!have_sta) {
3053                 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3054                 if (!sta)
3055                         return -ENOMEM;
3056         }
3057
3058         mutex_lock(&local->mtx);
3059         ieee80211_recalc_idle(sdata->local);
3060         mutex_unlock(&local->mtx);
3061
3062         /* switch to the right channel */
3063         sband = local->hw.wiphy->bands[cbss->channel->band];
3064
3065         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3066
3067         if (sband->ht_cap.ht_supported) {
3068                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3069                                               cbss->information_elements,
3070                                               cbss->len_information_elements);
3071                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3072                         ht_oper = (void *)(ht_oper_ie + 2);
3073         }
3074
3075         if (ht_oper) {
3076                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3077                                                           cbss->channel->band);
3078                 /* check that channel matches the right operating channel */
3079                 if (cbss->channel->center_freq != ht_cfreq) {
3080                         /*
3081                          * It's possible that some APs are confused here;
3082                          * Netgear WNDR3700 sometimes reports 4 higher than
3083                          * the actual channel in association responses, but
3084                          * since we look at probe response/beacon data here
3085                          * it should be OK.
3086                          */
3087                         sdata_info(sdata,
3088                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3089                                    cbss->channel->center_freq,
3090                                    ht_cfreq, ht_oper->primary_chan,
3091                                    cbss->channel->band);
3092                         ht_oper = NULL;
3093                 }
3094         }
3095
3096         if (ht_oper) {
3097                 channel_type = NL80211_CHAN_HT20;
3098
3099                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3100                         switch (ht_oper->ht_param &
3101                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3102                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3103                                 channel_type = NL80211_CHAN_HT40PLUS;
3104                                 break;
3105                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3106                                 channel_type = NL80211_CHAN_HT40MINUS;
3107                                 break;
3108                         }
3109                 }
3110         }
3111
3112         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3113                 /* can only fail due to HT40+/- mismatch */
3114                 channel_type = NL80211_CHAN_HT20;
3115                 sdata_info(sdata,
3116                            "disabling 40 MHz due to multi-vif mismatch\n");
3117                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3118                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3119                                                     channel_type));
3120         }
3121
3122         local->oper_channel = cbss->channel;
3123         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3124
3125         if (sta) {
3126                 u32 rates = 0, basic_rates = 0;
3127                 bool have_higher_than_11mbit;
3128                 int min_rate = INT_MAX, min_rate_index = -1;
3129
3130                 ieee80211_get_rates(sband, bss->supp_rates,
3131                                     bss->supp_rates_len,
3132                                     &rates, &basic_rates,
3133                                     &have_higher_than_11mbit,
3134                                     &min_rate, &min_rate_index);
3135
3136                 /*
3137                  * This used to be a workaround for basic rates missing
3138                  * in the association response frame. Now that we no
3139                  * longer use the basic rates from there, it probably
3140                  * doesn't happen any more, but keep the workaround so
3141                  * in case some *other* APs are buggy in different ways
3142                  * we can connect -- with a warning.
3143                  */
3144                 if (!basic_rates && min_rate_index >= 0) {
3145                         sdata_info(sdata,
3146                                    "No basic rates, using min rate instead\n");
3147                         basic_rates = BIT(min_rate_index);
3148                 }
3149
3150                 sta->sta.supp_rates[cbss->channel->band] = rates;
3151                 sdata->vif.bss_conf.basic_rates = basic_rates;
3152
3153                 /* cf. IEEE 802.11 9.2.12 */
3154                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3155                     have_higher_than_11mbit)
3156                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3157                 else
3158                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3159
3160                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3161
3162                 /* set timing information */
3163                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3164                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3165                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3166
3167                 /* tell driver about BSSID, basic rates and timing */
3168                 ieee80211_bss_info_change_notify(sdata,
3169                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3170                         BSS_CHANGED_BEACON_INT);
3171
3172                 if (assoc)
3173                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3174
3175                 err = sta_info_insert(sta);
3176                 sta = NULL;
3177                 if (err) {
3178                         sdata_info(sdata,
3179                                    "failed to insert STA entry for the AP (error %d)\n",
3180                                    err);
3181                         return err;
3182                 }
3183         } else
3184                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3185
3186         return 0;
3187 }
3188
3189 /* config hooks */
3190 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3191                        struct cfg80211_auth_request *req)
3192 {
3193         struct ieee80211_local *local = sdata->local;
3194         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3195         struct ieee80211_mgd_auth_data *auth_data;
3196         u16 auth_alg;
3197         int err;
3198
3199         /* prepare auth data structure */
3200
3201         switch (req->auth_type) {
3202         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3203                 auth_alg = WLAN_AUTH_OPEN;
3204                 break;
3205         case NL80211_AUTHTYPE_SHARED_KEY:
3206                 if (IS_ERR(local->wep_tx_tfm))
3207                         return -EOPNOTSUPP;
3208                 auth_alg = WLAN_AUTH_SHARED_KEY;
3209                 break;
3210         case NL80211_AUTHTYPE_FT:
3211                 auth_alg = WLAN_AUTH_FT;
3212                 break;
3213         case NL80211_AUTHTYPE_NETWORK_EAP:
3214                 auth_alg = WLAN_AUTH_LEAP;
3215                 break;
3216         default:
3217                 return -EOPNOTSUPP;
3218         }
3219
3220         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3221         if (!auth_data)
3222                 return -ENOMEM;
3223
3224         auth_data->bss = req->bss;
3225
3226         if (req->ie && req->ie_len) {
3227                 memcpy(auth_data->ie, req->ie, req->ie_len);
3228                 auth_data->ie_len = req->ie_len;
3229         }
3230
3231         if (req->key && req->key_len) {
3232                 auth_data->key_len = req->key_len;
3233                 auth_data->key_idx = req->key_idx;
3234                 memcpy(auth_data->key, req->key, req->key_len);
3235         }
3236
3237         auth_data->algorithm = auth_alg;
3238
3239         /* try to authenticate/probe */
3240
3241         mutex_lock(&ifmgd->mtx);
3242
3243         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3244             ifmgd->assoc_data) {
3245                 err = -EBUSY;
3246                 goto err_free;
3247         }
3248
3249         if (ifmgd->auth_data)
3250                 ieee80211_destroy_auth_data(sdata, false);
3251
3252         /* prep auth_data so we don't go into idle on disassoc */
3253         ifmgd->auth_data = auth_data;
3254
3255         if (ifmgd->associated)
3256                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3257
3258         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3259
3260         err = ieee80211_prep_connection(sdata, req->bss, false);
3261         if (err)
3262                 goto err_clear;
3263
3264         err = ieee80211_probe_auth(sdata);
3265         if (err) {
3266                 sta_info_destroy_addr(sdata, req->bss->bssid);
3267                 goto err_clear;
3268         }
3269
3270         /* hold our own reference */
3271         cfg80211_ref_bss(auth_data->bss);
3272         err = 0;
3273         goto out_unlock;
3274
3275  err_clear:
3276         ifmgd->auth_data = NULL;
3277  err_free:
3278         kfree(auth_data);
3279  out_unlock:
3280         mutex_unlock(&ifmgd->mtx);
3281
3282         return err;
3283 }
3284
3285 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3286                         struct cfg80211_assoc_request *req)
3287 {
3288         struct ieee80211_local *local = sdata->local;
3289         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3290         struct ieee80211_bss *bss = (void *)req->bss->priv;
3291         struct ieee80211_mgd_assoc_data *assoc_data;
3292         struct ieee80211_supported_band *sband;
3293         const u8 *ssidie, *ht_ie;
3294         int i, err;
3295
3296         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3297         if (!ssidie)
3298                 return -EINVAL;
3299
3300         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3301         if (!assoc_data)
3302                 return -ENOMEM;
3303
3304         mutex_lock(&ifmgd->mtx);
3305
3306         if (ifmgd->associated)
3307                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3308
3309         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3310                 err = -EBUSY;
3311                 goto err_free;
3312         }
3313
3314         if (ifmgd->assoc_data) {
3315                 err = -EBUSY;
3316                 goto err_free;
3317         }
3318
3319         if (ifmgd->auth_data) {
3320                 bool match;
3321
3322                 /* keep sta info, bssid if matching */
3323                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3324                 ieee80211_destroy_auth_data(sdata, match);
3325         }
3326
3327         /* prepare assoc data */
3328
3329         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3330         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3331         ifmgd->flags &= ~IEEE80211_STA_DISABLE_VHT;
3332
3333         ifmgd->beacon_crc_valid = false;
3334
3335         /*
3336          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3337          * We still associate in non-HT mode (11a/b/g) if any one of these
3338          * ciphers is configured as pairwise.
3339          * We can set this to true for non-11n hardware, that'll be checked
3340          * separately along with the peer capabilities.
3341          */
3342         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3343                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3344                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3345                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3346                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3347                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3348                         netdev_info(sdata->dev,
3349                                     "disabling HT/VHT due to WEP/TKIP use\n");
3350                 }
3351         }
3352
3353         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3354                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3355                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3356         }
3357
3358         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3359         sband = local->hw.wiphy->bands[req->bss->channel->band];
3360         if (!sband->ht_cap.ht_supported ||
3361             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3362                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3363                 netdev_info(sdata->dev,
3364                             "disabling HT as WMM/QoS is not supported\n");
3365         }
3366
3367         /* disable VHT if we don't support it or the AP doesn't use WMM */
3368         if (!sband->vht_cap.vht_supported ||
3369             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3370                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3371                 netdev_info(sdata->dev,
3372                             "disabling VHT as WMM/QoS is not supported\n");
3373         }
3374
3375         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3376         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3377                sizeof(ifmgd->ht_capa_mask));
3378
3379         if (req->ie && req->ie_len) {
3380                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3381                 assoc_data->ie_len = req->ie_len;
3382         }
3383
3384         assoc_data->bss = req->bss;
3385
3386         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3387                 if (ifmgd->powersave)
3388                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3389                 else
3390                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3391         } else
3392                 ifmgd->ap_smps = ifmgd->req_smps;
3393
3394         assoc_data->capability = req->bss->capability;
3395         assoc_data->wmm = bss->wmm_used &&
3396                           (local->hw.queues >= IEEE80211_NUM_ACS);
3397         assoc_data->supp_rates = bss->supp_rates;
3398         assoc_data->supp_rates_len = bss->supp_rates_len;
3399
3400         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3401         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3402                 assoc_data->ap_ht_param =
3403                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3404         else
3405                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3406
3407         if (bss->wmm_used && bss->uapsd_supported &&
3408             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3409                 assoc_data->uapsd = true;
3410                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3411         } else {
3412                 assoc_data->uapsd = false;
3413                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3414         }
3415
3416         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3417         assoc_data->ssid_len = ssidie[1];
3418
3419         if (req->prev_bssid)
3420                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3421
3422         if (req->use_mfp) {
3423                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3424                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3425         } else {
3426                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3427                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3428         }
3429
3430         if (req->crypto.control_port)
3431                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3432         else
3433                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3434
3435         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3436         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3437
3438         /* kick off associate process */
3439
3440         ifmgd->assoc_data = assoc_data;
3441
3442         err = ieee80211_prep_connection(sdata, req->bss, true);
3443         if (err)
3444                 goto err_clear;
3445
3446         if (!bss->dtim_period &&
3447             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3448                 /*
3449                  * Wait up to one beacon interval ...
3450                  * should this be more if we miss one?
3451                  */
3452                 sdata_info(sdata, "waiting for beacon from %pM\n",
3453                            ifmgd->bssid);
3454                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3455         } else {
3456                 assoc_data->have_beacon = true;
3457                 assoc_data->sent_assoc = false;
3458                 assoc_data->timeout = jiffies;
3459         }
3460         run_again(ifmgd, assoc_data->timeout);
3461
3462         if (bss->corrupt_data) {
3463                 char *corrupt_type = "data";
3464                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3465                         if (bss->corrupt_data &
3466                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3467                                 corrupt_type = "beacon and probe response";
3468                         else
3469                                 corrupt_type = "beacon";
3470                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3471                         corrupt_type = "probe response";
3472                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3473                            corrupt_type);
3474         }
3475
3476         err = 0;
3477         goto out;
3478  err_clear:
3479         ifmgd->assoc_data = NULL;
3480  err_free:
3481         kfree(assoc_data);
3482  out:
3483         mutex_unlock(&ifmgd->mtx);
3484
3485         return err;
3486 }
3487
3488 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3489                          struct cfg80211_deauth_request *req)
3490 {
3491         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3492         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3493
3494         mutex_lock(&ifmgd->mtx);
3495
3496         if (ifmgd->auth_data) {
3497                 ieee80211_destroy_auth_data(sdata, false);
3498                 mutex_unlock(&ifmgd->mtx);
3499                 return 0;
3500         }
3501
3502         sdata_info(sdata,
3503                    "deauthenticating from %pM by local choice (reason=%d)\n",
3504                    req->bssid, req->reason_code);
3505
3506         if (ifmgd->associated &&
3507             ether_addr_equal(ifmgd->associated->bssid, req->bssid))
3508                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3509                                        req->reason_code, true, frame_buf);
3510         else
3511                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3512                                                IEEE80211_STYPE_DEAUTH,
3513                                                req->reason_code, true,
3514                                                frame_buf);
3515         mutex_unlock(&ifmgd->mtx);
3516
3517         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3518
3519         mutex_lock(&sdata->local->mtx);
3520         ieee80211_recalc_idle(sdata->local);
3521         mutex_unlock(&sdata->local->mtx);
3522
3523         return 0;
3524 }
3525
3526 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3527                            struct cfg80211_disassoc_request *req)
3528 {
3529         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3530         u8 bssid[ETH_ALEN];
3531         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3532
3533         mutex_lock(&ifmgd->mtx);
3534
3535         /*
3536          * cfg80211 should catch this ... but it's racy since
3537          * we can receive a disassoc frame, process it, hand it
3538          * to cfg80211 while that's in a locked section already
3539          * trying to tell us that the user wants to disconnect.
3540          */
3541         if (ifmgd->associated != req->bss) {
3542                 mutex_unlock(&ifmgd->mtx);
3543                 return -ENOLINK;
3544         }
3545
3546         sdata_info(sdata,
3547                    "disassociating from %pM by local choice (reason=%d)\n",
3548                    req->bss->bssid, req->reason_code);
3549
3550         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3551         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3552                                req->reason_code, !req->local_state_change,
3553                                frame_buf);
3554         mutex_unlock(&ifmgd->mtx);
3555
3556         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3557
3558         mutex_lock(&sdata->local->mtx);
3559         ieee80211_recalc_idle(sdata->local);
3560         mutex_unlock(&sdata->local->mtx);
3561
3562         return 0;
3563 }
3564
3565 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3566 {
3567         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3568
3569         mutex_lock(&ifmgd->mtx);
3570         if (ifmgd->assoc_data)
3571                 ieee80211_destroy_assoc_data(sdata, false);
3572         if (ifmgd->auth_data)
3573                 ieee80211_destroy_auth_data(sdata, false);
3574         del_timer_sync(&ifmgd->timer);
3575         mutex_unlock(&ifmgd->mtx);
3576 }
3577
3578 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3579                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3580                                gfp_t gfp)
3581 {
3582         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3583
3584         trace_api_cqm_rssi_notify(sdata, rssi_event);
3585
3586         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3587 }
3588 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);