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->oper_channel->band];
 189
 190         switch (sdata->vif.bss_conf.channel_type) {
 191         case NL80211_CHAN_HT40PLUS:
 192                 if (local->oper_channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
 193                         disable_40 = true;
 194                 break;
 195         case NL80211_CHAN_HT40MINUS:
 196                 if (local->oper_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                 ieee80211_tx_skb(sdata, skb);
 614         }
 615 }
 616
 617 void ieee80211_send_pspoll(struct ieee80211_local *local,
 618                            struct ieee80211_sub_if_data *sdata)
 619 {
 620         struct ieee80211_pspoll *pspoll;
 621         struct sk_buff *skb;
 622
 623         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 624         if (!skb)
 625                 return;
 626
 627         pspoll = (struct ieee80211_pspoll *) skb->data;
 628         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 629
 630         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 631         ieee80211_tx_skb(sdata, skb);
 632 }
 633
 634 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 635                              struct ieee80211_sub_if_data *sdata,
 636                              int powersave)
 637 {
 638         struct sk_buff *skb;
 639         struct ieee80211_hdr_3addr *nullfunc;
 640         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 641
 642         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 643         if (!skb)
 644                 return;
 645
 646         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 647         if (powersave)
 648                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 649
 650         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 651         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 652                             IEEE80211_STA_CONNECTION_POLL))
 653                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 654
 655         ieee80211_tx_skb(sdata, skb);
 656 }
 657
 658 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 659                                           struct ieee80211_sub_if_data *sdata)
 660 {
 661         struct sk_buff *skb;
 662         struct ieee80211_hdr *nullfunc;
 663         __le16 fc;
 664
 665         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 666                 return;
 667
 668         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 669         if (!skb)
 670                 return;
 671
 672         skb_reserve(skb, local->hw.extra_tx_headroom);
 673
 674         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 675         memset(nullfunc, 0, 30);
 676         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 677                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 678         nullfunc->frame_control = fc;
 679         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 680         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 681         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 682         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 683
 684         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 685         ieee80211_tx_skb(sdata, skb);
 686 }
 687
 688 /* spectrum management related things */
 689 static void ieee80211_chswitch_work(struct work_struct *work)
 690 {
 691         struct ieee80211_sub_if_data *sdata =
 692                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 693         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 694
 695         if (!ieee80211_sdata_running(sdata))
 696                 return;
 697
 698         mutex_lock(&ifmgd->mtx);
 699         if (!ifmgd->associated)
 700                 goto out;
 701
 702         sdata->local->oper_channel = sdata->local->csa_channel;
 703         if (!sdata->local->ops->channel_switch) {
 704                 /* call "hw_config" only if doing sw channel switch */
 705                 ieee80211_hw_config(sdata->local,
 706                         IEEE80211_CONF_CHANGE_CHANNEL);
 707         } else {
 708                 /* update the device channel directly */
 709                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 710         }
 711
 712         /* XXX: shouldn't really modify cfg80211-owned data! */
 713         ifmgd->associated->channel = sdata->local->oper_channel;
 714
 715         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 716                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 717  out:
 718         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 719         mutex_unlock(&ifmgd->mtx);
 720 }
 721
 722 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 723 {
 724         struct ieee80211_sub_if_data *sdata;
 725         struct ieee80211_if_managed *ifmgd;
 726
 727         sdata = vif_to_sdata(vif);
 728         ifmgd = &sdata->u.mgd;
 729
 730         trace_api_chswitch_done(sdata, success);
 731         if (!success) {
 732                 /*
 733                  * If the channel switch was not successful, stay
 734                  * around on the old channel. We currently lack
 735                  * good handling of this situation, possibly we
 736                  * should just drop the association.
 737                  */
 738                 sdata->local->csa_channel = sdata->local->oper_channel;
 739         }
 740
 741         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 742 }
 743 EXPORT_SYMBOL(ieee80211_chswitch_done);
 744
 745 static void ieee80211_chswitch_timer(unsigned long data)
 746 {
 747         struct ieee80211_sub_if_data *sdata =
 748                 (struct ieee80211_sub_if_data *) data;
 749         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 750
 751         if (sdata->local->quiescing) {
 752                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 753                 return;
 754         }
 755
 756         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 757 }
 758
 759 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 760                                       struct ieee80211_channel_sw_ie *sw_elem,
 761                                       struct ieee80211_bss *bss,
 762                                       u64 timestamp)
 763 {
 764         struct cfg80211_bss *cbss =
 765                 container_of((void *)bss, struct cfg80211_bss, priv);
 766         struct ieee80211_channel *new_ch;
 767         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 768         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 769                                                       cbss->channel->band);
 770
 771         ASSERT_MGD_MTX(ifmgd);
 772
 773         if (!ifmgd->associated)
 774                 return;
 775
 776         if (sdata->local->scanning)
 777                 return;
 778
 779         /* Disregard subsequent beacons if we are already running a timer
 780            processing a CSA */
 781
 782         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 783                 return;
 784
 785         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 786         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 787                 return;
 788
 789         sdata->local->csa_channel = new_ch;
 790
 791         if (sdata->local->ops->channel_switch) {
 792                 /* use driver's channel switch callback */
 793                 struct ieee80211_channel_switch ch_switch;
 794                 memset(&ch_switch, 0, sizeof(ch_switch));
 795                 ch_switch.timestamp = timestamp;
 796                 if (sw_elem->mode) {
 797                         ch_switch.block_tx = true;
 798                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 799                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 800                 }
 801                 ch_switch.channel = new_ch;
 802                 ch_switch.count = sw_elem->count;
 803                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 804                 drv_channel_switch(sdata->local, &ch_switch);
 805                 return;
 806         }
 807
 808         /* channel switch handled in software */
 809         if (sw_elem->count <= 1) {
 810                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 811         } else {
 812                 if (sw_elem->mode)
 813                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
 814                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 815                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 816                 mod_timer(&ifmgd->chswitch_timer,
 817                           jiffies +
 818                           msecs_to_jiffies(sw_elem->count *
 819                                            cbss->beacon_interval));
 820         }
 821 }
 822
 823 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 824                                         u16 capab_info, u8 *pwr_constr_elem,
 825                                         u8 pwr_constr_elem_len)
 826 {
 827         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 828
 829         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 830                 return;
 831
 832         /* Power constraint IE length should be 1 octet */
 833         if (pwr_constr_elem_len != 1)
 834                 return;
 835
 836         if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
 837             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 838                 sdata->local->power_constr_level = *pwr_constr_elem;
 839                 ieee80211_hw_config(sdata->local, 0);
 840         }
 841 }
 842
 843 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 844 {
 845         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 846         struct ieee80211_local *local = sdata->local;
 847         struct ieee80211_conf *conf = &local->hw.conf;
 848
 849         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 850                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 851                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 852
 853         local->disable_dynamic_ps = false;
 854         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 855 }
 856 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 857
 858 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 859 {
 860         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 861         struct ieee80211_local *local = sdata->local;
 862         struct ieee80211_conf *conf = &local->hw.conf;
 863
 864         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 865                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 866                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 867
 868         local->disable_dynamic_ps = true;
 869         conf->dynamic_ps_timeout = 0;
 870         del_timer_sync(&local->dynamic_ps_timer);
 871         ieee80211_queue_work(&local->hw,
 872                              &local->dynamic_ps_enable_work);
 873 }
 874 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 875
 876 /* powersave */
 877 static void ieee80211_enable_ps(struct ieee80211_local *local,
 878                                 struct ieee80211_sub_if_data *sdata)
 879 {
 880         struct ieee80211_conf *conf = &local->hw.conf;
 881
 882         /*
 883          * If we are scanning right now then the parameters will
 884          * take effect when scan finishes.
 885          */
 886         if (local->scanning)
 887                 return;
 888
 889         if (conf->dynamic_ps_timeout > 0 &&
 890             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 891                 mod_timer(&local->dynamic_ps_timer, jiffies +
 892                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 893         } else {
 894                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 895                         ieee80211_send_nullfunc(local, sdata, 1);
 896
 897                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 898                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 899                         return;
 900
 901                 conf->flags |= IEEE80211_CONF_PS;
 902                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 903         }
 904 }
 905
 906 static void ieee80211_change_ps(struct ieee80211_local *local)
 907 {
 908         struct ieee80211_conf *conf = &local->hw.conf;
 909
 910         if (local->ps_sdata) {
 911                 ieee80211_enable_ps(local, local->ps_sdata);
 912         } else if (conf->flags & IEEE80211_CONF_PS) {
 913                 conf->flags &= ~IEEE80211_CONF_PS;
 914                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 915                 del_timer_sync(&local->dynamic_ps_timer);
 916                 cancel_work_sync(&local->dynamic_ps_enable_work);
 917         }
 918 }
 919
 920 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 921 {
 922         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 923         struct sta_info *sta = NULL;
 924         bool authorized = false;
 925
 926         if (!mgd->powersave)
 927                 return false;
 928
 929         if (mgd->broken_ap)
 930                 return false;
 931
 932         if (!mgd->associated)
 933                 return false;
 934
 935         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 936                           IEEE80211_STA_CONNECTION_POLL))
 937                 return false;
 938
 939         rcu_read_lock();
 940         sta = sta_info_get(sdata, mgd->bssid);
 941         if (sta)
 942                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 943         rcu_read_unlock();
 944
 945         return authorized;
 946 }
 947
 948 /* need to hold RTNL or interface lock */
 949 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 950 {
 951         struct ieee80211_sub_if_data *sdata, *found = NULL;
 952         int count = 0;
 953         int timeout;
 954
 955         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 956                 local->ps_sdata = NULL;
 957                 return;
 958         }
 959
 960         list_for_each_entry(sdata, &local->interfaces, list) {
 961                 if (!ieee80211_sdata_running(sdata))
 962                         continue;
 963                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 964                         /* If an AP vif is found, then disable PS
 965                          * by setting the count to zero thereby setting
 966                          * ps_sdata to NULL.
 967                          */
 968                         count = 0;
 969                         break;
 970                 }
 971                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 972                         continue;
 973                 found = sdata;
 974                 count++;
 975         }
 976
 977         if (count == 1 && ieee80211_powersave_allowed(found)) {
 978                 struct ieee80211_conf *conf = &local->hw.conf;
 979                 s32 beaconint_us;
 980
 981                 if (latency < 0)
 982                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 983
 984                 beaconint_us = ieee80211_tu_to_usec(
 985                                         found->vif.bss_conf.beacon_int);
 986
 987                 timeout = local->dynamic_ps_forced_timeout;
 988                 if (timeout < 0) {
 989                         /*
 990                          * Go to full PSM if the user configures a very low
 991                          * latency requirement.
 992                          * The 2000 second value is there for compatibility
 993                          * until the PM_QOS_NETWORK_LATENCY is configured
 994                          * with real values.
 995                          */
 996                         if (latency > (1900 * USEC_PER_MSEC) &&
 997                             latency != (2000 * USEC_PER_SEC))
 998                                 timeout = 0;
 999                         else
1000                                 timeout = 100;
1001                 }
1002                 local->dynamic_ps_user_timeout = timeout;
1003                 if (!local->disable_dynamic_ps)
1004                         conf->dynamic_ps_timeout =
1005                                 local->dynamic_ps_user_timeout;
1006
1007                 if (beaconint_us > latency) {
1008                         local->ps_sdata = NULL;
1009                 } else {
1010                         struct ieee80211_bss *bss;
1011                         int maxslp = 1;
1012                         u8 dtimper;
1013
1014                         bss = (void *)found->u.mgd.associated->priv;
1015                         dtimper = bss->dtim_period;
1016
1017                         /* If the TIM IE is invalid, pretend the value is 1 */
1018                         if (!dtimper)
1019                                 dtimper = 1;
1020                         else if (dtimper > 1)
1021                                 maxslp = min_t(int, dtimper,
1022                                                     latency / beaconint_us);
1023
1024                         local->hw.conf.max_sleep_period = maxslp;
1025                         local->hw.conf.ps_dtim_period = dtimper;
1026                         local->ps_sdata = found;
1027                 }
1028         } else {
1029                 local->ps_sdata = NULL;
1030         }
1031
1032         ieee80211_change_ps(local);
1033 }
1034
1035 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1036 {
1037         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1038
1039         if (sdata->vif.bss_conf.ps != ps_allowed) {
1040                 sdata->vif.bss_conf.ps = ps_allowed;
1041                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1042         }
1043 }
1044
1045 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1046 {
1047         struct ieee80211_local *local =
1048                 container_of(work, struct ieee80211_local,
1049                              dynamic_ps_disable_work);
1050
1051         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1052                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1053                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1054         }
1055
1056         ieee80211_wake_queues_by_reason(&local->hw,
1057                                         IEEE80211_QUEUE_STOP_REASON_PS);
1058 }
1059
1060 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1061 {
1062         struct ieee80211_local *local =
1063                 container_of(work, struct ieee80211_local,
1064                              dynamic_ps_enable_work);
1065         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1066         struct ieee80211_if_managed *ifmgd;
1067         unsigned long flags;
1068         int q;
1069
1070         /* can only happen when PS was just disabled anyway */
1071         if (!sdata)
1072                 return;
1073
1074         ifmgd = &sdata->u.mgd;
1075
1076         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1077                 return;
1078
1079         if (!local->disable_dynamic_ps &&
1080             local->hw.conf.dynamic_ps_timeout > 0) {
1081                 /* don't enter PS if TX frames are pending */
1082                 if (drv_tx_frames_pending(local)) {
1083                         mod_timer(&local->dynamic_ps_timer, jiffies +
1084                                   msecs_to_jiffies(
1085                                   local->hw.conf.dynamic_ps_timeout));
1086                         return;
1087                 }
1088
1089                 /*
1090                  * transmission can be stopped by others which leads to
1091                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1092                  * is not the actual idle state.
1093                  */
1094                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1095                 for (q = 0; q < local->hw.queues; q++) {
1096                         if (local->queue_stop_reasons[q]) {
1097                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1098                                                        flags);
1099                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1100                                           msecs_to_jiffies(
1101                                           local->hw.conf.dynamic_ps_timeout));
1102                                 return;
1103                         }
1104                 }
1105                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1106         }
1107
1108         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1109             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1110                 netif_tx_stop_all_queues(sdata->dev);
1111
1112                 if (drv_tx_frames_pending(local))
1113                         mod_timer(&local->dynamic_ps_timer, jiffies +
1114                                   msecs_to_jiffies(
1115                                   local->hw.conf.dynamic_ps_timeout));
1116                 else {
1117                         ieee80211_send_nullfunc(local, sdata, 1);
1118                         /* Flush to get the tx status of nullfunc frame */
1119                         drv_flush(local, false);
1120                 }
1121         }
1122
1123         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1124               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1125             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1126                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1127                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1128                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1129         }
1130
1131         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1132                 netif_tx_wake_all_queues(sdata->dev);
1133 }
1134
1135 void ieee80211_dynamic_ps_timer(unsigned long data)
1136 {
1137         struct ieee80211_local *local = (void *) data;
1138
1139         if (local->quiescing || local->suspended)
1140                 return;
1141
1142         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1143 }
1144
1145 /* MLME */
1146 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1147                                      struct ieee80211_sub_if_data *sdata,
1148                                      u8 *wmm_param, size_t wmm_param_len)
1149 {
1150         struct ieee80211_tx_queue_params params;
1151         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1152         size_t left;
1153         int count;
1154         u8 *pos, uapsd_queues = 0;
1155
1156         if (!local->ops->conf_tx)
1157                 return false;
1158
1159         if (local->hw.queues < IEEE80211_NUM_ACS)
1160                 return false;
1161
1162         if (!wmm_param)
1163                 return false;
1164
1165         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1166                 return false;
1167
1168         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1169                 uapsd_queues = ifmgd->uapsd_queues;
1170
1171         count = wmm_param[6] & 0x0f;
1172         if (count == ifmgd->wmm_last_param_set)
1173                 return false;
1174         ifmgd->wmm_last_param_set = count;
1175
1176         pos = wmm_param + 8;
1177         left = wmm_param_len - 8;
1178
1179         memset(&params, 0, sizeof(params));
1180
1181         sdata->wmm_acm = 0;
1182         for (; left >= 4; left -= 4, pos += 4) {
1183                 int aci = (pos[0] >> 5) & 0x03;
1184                 int acm = (pos[0] >> 4) & 0x01;
1185                 bool uapsd = false;
1186                 int queue;
1187
1188                 switch (aci) {
1189                 case 1: /* AC_BK */
1190                         queue = 3;
1191                         if (acm)
1192                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1193                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1194                                 uapsd = true;
1195                         break;
1196                 case 2: /* AC_VI */
1197                         queue = 1;
1198                         if (acm)
1199                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1200                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1201                                 uapsd = true;
1202                         break;
1203                 case 3: /* AC_VO */
1204                         queue = 0;
1205                         if (acm)
1206                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1207                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1208                                 uapsd = true;
1209                         break;
1210                 case 0: /* AC_BE */
1211                 default:
1212                         queue = 2;
1213                         if (acm)
1214                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1215                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1216                                 uapsd = true;
1217                         break;
1218                 }
1219
1220                 params.aifs = pos[0] & 0x0f;
1221                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1222                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1223                 params.txop = get_unaligned_le16(pos + 2);
1224                 params.uapsd = uapsd;
1225
1226                 mlme_dbg(sdata,
1227                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1228                          queue, aci, acm,
1229                          params.aifs, params.cw_min, params.cw_max,
1230                          params.txop, params.uapsd);
1231                 sdata->tx_conf[queue] = params;
1232                 if (drv_conf_tx(local, sdata, queue, &params))
1233                         sdata_err(sdata,
1234                                   "failed to set TX queue parameters for queue %d\n",
1235                                   queue);
1236         }
1237
1238         /* enable WMM or activate new settings */
1239         sdata->vif.bss_conf.qos = true;
1240         return true;
1241 }
1242
1243 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1244 {
1245         lockdep_assert_held(&sdata->local->mtx);
1246
1247         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1248                                 IEEE80211_STA_BEACON_POLL);
1249         ieee80211_run_deferred_scan(sdata->local);
1250 }
1251
1252 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1253 {
1254         mutex_lock(&sdata->local->mtx);
1255         __ieee80211_stop_poll(sdata);
1256         mutex_unlock(&sdata->local->mtx);
1257 }
1258
1259 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1260                                            u16 capab, bool erp_valid, u8 erp)
1261 {
1262         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1263         u32 changed = 0;
1264         bool use_protection;
1265         bool use_short_preamble;
1266         bool use_short_slot;
1267
1268         if (erp_valid) {
1269                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1270                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1271         } else {
1272                 use_protection = false;
1273                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1274         }
1275
1276         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1277         if (sdata->local->oper_channel->band == IEEE80211_BAND_5GHZ)
1278                 use_short_slot = true;
1279
1280         if (use_protection != bss_conf->use_cts_prot) {
1281                 bss_conf->use_cts_prot = use_protection;
1282                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1283         }
1284
1285         if (use_short_preamble != bss_conf->use_short_preamble) {
1286                 bss_conf->use_short_preamble = use_short_preamble;
1287                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1288         }
1289
1290         if (use_short_slot != bss_conf->use_short_slot) {
1291                 bss_conf->use_short_slot = use_short_slot;
1292                 changed |= BSS_CHANGED_ERP_SLOT;
1293         }
1294
1295         return changed;
1296 }
1297
1298 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1299                                      struct cfg80211_bss *cbss,
1300                                      u32 bss_info_changed)
1301 {
1302         struct ieee80211_bss *bss = (void *)cbss->priv;
1303         struct ieee80211_local *local = sdata->local;
1304         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1305
1306         bss_info_changed |= BSS_CHANGED_ASSOC;
1307         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1308                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1309
1310         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1311                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1312
1313         sdata->u.mgd.associated = cbss;
1314         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1315
1316         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1317
1318         /* just to be sure */
1319         ieee80211_stop_poll(sdata);
1320
1321         ieee80211_led_assoc(local, 1);
1322
1323         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1324                 bss_conf->dtim_period = bss->dtim_period;
1325         else
1326                 bss_conf->dtim_period = 0;
1327
1328         bss_conf->assoc = 1;
1329
1330         /* Tell the driver to monitor connection quality (if supported) */
1331         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1332             bss_conf->cqm_rssi_thold)
1333                 bss_info_changed |= BSS_CHANGED_CQM;
1334
1335         /* Enable ARP filtering */
1336         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1337                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1338                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1339         }
1340
1341         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1342
1343         mutex_lock(&local->iflist_mtx);
1344         ieee80211_recalc_ps(local, -1);
1345         ieee80211_recalc_smps(local);
1346         mutex_unlock(&local->iflist_mtx);
1347
1348         ieee80211_recalc_ps_vif(sdata);
1349
1350         netif_tx_start_all_queues(sdata->dev);
1351         netif_carrier_on(sdata->dev);
1352 }
1353
1354 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1355                                    u16 stype, u16 reason, bool tx,
1356                                    u8 *frame_buf)
1357 {
1358         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1359         struct ieee80211_local *local = sdata->local;
1360         struct sta_info *sta;
1361         u32 changed = 0;
1362
1363         ASSERT_MGD_MTX(ifmgd);
1364
1365         if (WARN_ON_ONCE(tx && !frame_buf))
1366                 return;
1367
1368         if (WARN_ON(!ifmgd->associated))
1369                 return;
1370
1371         ieee80211_stop_poll(sdata);
1372
1373         ifmgd->associated = NULL;
1374
1375         /*
1376          * we need to commit the associated = NULL change because the
1377          * scan code uses that to determine whether this iface should
1378          * go to/wake up from powersave or not -- and could otherwise
1379          * wake the queues erroneously.
1380          */
1381         smp_mb();
1382
1383         /*
1384          * Thus, we can only afterwards stop the queues -- to account
1385          * for the case where another CPU is finishing a scan at this
1386          * time -- we don't want the scan code to enable queues.
1387          */
1388
1389         netif_tx_stop_all_queues(sdata->dev);
1390         netif_carrier_off(sdata->dev);
1391
1392         mutex_lock(&local->sta_mtx);
1393         sta = sta_info_get(sdata, ifmgd->bssid);
1394         if (sta) {
1395                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1396                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1397         }
1398         mutex_unlock(&local->sta_mtx);
1399
1400         /*
1401          * if we want to get out of ps before disassoc (why?) we have
1402          * to do it before sending disassoc, as otherwise the null-packet
1403          * won't be valid.
1404          */
1405         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1406                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1407                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1408         }
1409         local->ps_sdata = NULL;
1410
1411         /* disable per-vif ps */
1412         ieee80211_recalc_ps_vif(sdata);
1413
1414         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1415         if (tx)
1416                 drv_flush(local, false);
1417
1418         /* deauthenticate/disassociate now */
1419         if (tx || frame_buf)
1420                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1421                                                reason, tx, frame_buf);
1422
1423         /* flush out frame */
1424         if (tx)
1425                 drv_flush(local, false);
1426
1427         /* clear bssid only after building the needed mgmt frames */
1428         memset(ifmgd->bssid, 0, ETH_ALEN);
1429
1430         /* remove AP and TDLS peers */
1431         sta_info_flush(local, sdata);
1432
1433         /* finally reset all BSS / config parameters */
1434         changed |= ieee80211_reset_erp_info(sdata);
1435
1436         ieee80211_led_assoc(local, 0);
1437         changed |= BSS_CHANGED_ASSOC;
1438         sdata->vif.bss_conf.assoc = false;
1439
1440         /* on the next assoc, re-program HT parameters */
1441         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1442         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1443
1444         local->power_constr_level = 0;
1445
1446         del_timer_sync(&local->dynamic_ps_timer);
1447         cancel_work_sync(&local->dynamic_ps_enable_work);
1448
1449         /* Disable ARP filtering */
1450         if (sdata->vif.bss_conf.arp_filter_enabled) {
1451                 sdata->vif.bss_conf.arp_filter_enabled = false;
1452                 changed |= BSS_CHANGED_ARP_FILTER;
1453         }
1454
1455         sdata->vif.bss_conf.qos = false;
1456         changed |= BSS_CHANGED_QOS;
1457
1458         /* The BSSID (not really interesting) and HT changed */
1459         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1460         ieee80211_bss_info_change_notify(sdata, changed);
1461
1462         /* channel(_type) changes are handled by ieee80211_hw_config */
1463         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1464         ieee80211_hw_config(local, 0);
1465
1466         /* disassociated - set to defaults now */
1467         ieee80211_set_wmm_default(sdata, false);
1468
1469         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1470         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1471         del_timer_sync(&sdata->u.mgd.timer);
1472         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1473 }
1474
1475 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1476                              struct ieee80211_hdr *hdr)
1477 {
1478         /*
1479          * We can postpone the mgd.timer whenever receiving unicast frames
1480          * from AP because we know that the connection is working both ways
1481          * at that time. But multicast frames (and hence also beacons) must
1482          * be ignored here, because we need to trigger the timer during
1483          * data idle periods for sending the periodic probe request to the
1484          * AP we're connected to.
1485          */
1486         if (is_multicast_ether_addr(hdr->addr1))
1487                 return;
1488
1489         ieee80211_sta_reset_conn_monitor(sdata);
1490 }
1491
1492 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1493 {
1494         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1495         struct ieee80211_local *local = sdata->local;
1496
1497         mutex_lock(&local->mtx);
1498         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1499                               IEEE80211_STA_CONNECTION_POLL))) {
1500                 mutex_unlock(&local->mtx);
1501                 return;
1502         }
1503
1504         __ieee80211_stop_poll(sdata);
1505
1506         mutex_lock(&local->iflist_mtx);
1507         ieee80211_recalc_ps(local, -1);
1508         mutex_unlock(&local->iflist_mtx);
1509
1510         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1511                 goto out;
1512
1513         /*
1514          * We've received a probe response, but are not sure whether
1515          * we have or will be receiving any beacons or data, so let's
1516          * schedule the timers again, just in case.
1517          */
1518         ieee80211_sta_reset_beacon_monitor(sdata);
1519
1520         mod_timer(&ifmgd->conn_mon_timer,
1521                   round_jiffies_up(jiffies +
1522                                    IEEE80211_CONNECTION_IDLE_TIME));
1523 out:
1524         mutex_unlock(&local->mtx);
1525 }
1526
1527 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1528                              struct ieee80211_hdr *hdr, bool ack)
1529 {
1530         if (!ieee80211_is_data(hdr->frame_control))
1531             return;
1532
1533         if (ack)
1534                 ieee80211_sta_reset_conn_monitor(sdata);
1535
1536         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1537             sdata->u.mgd.probe_send_count > 0) {
1538                 if (ack)
1539                         sdata->u.mgd.probe_send_count = 0;
1540                 else
1541                         sdata->u.mgd.nullfunc_failed = true;
1542                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1543         }
1544 }
1545
1546 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1547 {
1548         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1549         const u8 *ssid;
1550         u8 *dst = ifmgd->associated->bssid;
1551         u8 unicast_limit = max(1, max_probe_tries - 3);
1552
1553         /*
1554          * Try sending broadcast probe requests for the last three
1555          * probe requests after the first ones failed since some
1556          * buggy APs only support broadcast probe requests.
1557          */
1558         if (ifmgd->probe_send_count >= unicast_limit)
1559                 dst = NULL;
1560
1561         /*
1562          * When the hardware reports an accurate Tx ACK status, it's
1563          * better to send a nullfunc frame instead of a probe request,
1564          * as it will kick us off the AP quickly if we aren't associated
1565          * anymore. The timeout will be reset if the frame is ACKed by
1566          * the AP.
1567          */
1568         ifmgd->probe_send_count++;
1569
1570         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1571                 ifmgd->nullfunc_failed = false;
1572                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1573         } else {
1574                 int ssid_len;
1575
1576                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1577                 if (WARN_ON_ONCE(ssid == NULL))
1578                         ssid_len = 0;
1579                 else
1580                         ssid_len = ssid[1];
1581
1582                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1583                                          0, (u32) -1, true, false);
1584         }
1585
1586         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1587         run_again(ifmgd, ifmgd->probe_timeout);
1588         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1589                 drv_flush(sdata->local, false);
1590 }
1591
1592 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1593                                    bool beacon)
1594 {
1595         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1596         bool already = false;
1597
1598         if (!ieee80211_sdata_running(sdata))
1599                 return;
1600
1601         mutex_lock(&ifmgd->mtx);
1602
1603         if (!ifmgd->associated)
1604                 goto out;
1605
1606         mutex_lock(&sdata->local->mtx);
1607
1608         if (sdata->local->tmp_channel || sdata->local->scanning) {
1609                 mutex_unlock(&sdata->local->mtx);
1610                 goto out;
1611         }
1612
1613         if (beacon)
1614                 mlme_dbg_ratelimited(sdata,
1615                                      "detected beacon loss from AP - sending probe request\n");
1616
1617         ieee80211_cqm_rssi_notify(&sdata->vif,
1618                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1619
1620         /*
1621          * The driver/our work has already reported this event or the
1622          * connection monitoring has kicked in and we have already sent
1623          * a probe request. Or maybe the AP died and the driver keeps
1624          * reporting until we disassociate...
1625          *
1626          * In either case we have to ignore the current call to this
1627          * function (except for setting the correct probe reason bit)
1628          * because otherwise we would reset the timer every time and
1629          * never check whether we received a probe response!
1630          */
1631         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1632                             IEEE80211_STA_CONNECTION_POLL))
1633                 already = true;
1634
1635         if (beacon)
1636                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1637         else
1638                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1639
1640         mutex_unlock(&sdata->local->mtx);
1641
1642         if (already)
1643                 goto out;
1644
1645         mutex_lock(&sdata->local->iflist_mtx);
1646         ieee80211_recalc_ps(sdata->local, -1);
1647         mutex_unlock(&sdata->local->iflist_mtx);
1648
1649         ifmgd->probe_send_count = 0;
1650         ieee80211_mgd_probe_ap_send(sdata);
1651  out:
1652         mutex_unlock(&ifmgd->mtx);
1653 }
1654
1655 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1656                                           struct ieee80211_vif *vif)
1657 {
1658         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1659         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1660         struct cfg80211_bss *cbss;
1661         struct sk_buff *skb;
1662         const u8 *ssid;
1663         int ssid_len;
1664
1665         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1666                 return NULL;
1667
1668         ASSERT_MGD_MTX(ifmgd);
1669
1670         if (ifmgd->associated)
1671                 cbss = ifmgd->associated;
1672         else if (ifmgd->auth_data)
1673                 cbss = ifmgd->auth_data->bss;
1674         else if (ifmgd->assoc_data)
1675                 cbss = ifmgd->assoc_data->bss;
1676         else
1677                 return NULL;
1678
1679         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1680         if (WARN_ON_ONCE(ssid == NULL))
1681                 ssid_len = 0;
1682         else
1683                 ssid_len = ssid[1];
1684
1685         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1686                                         (u32) -1,
1687                                         sdata->local->oper_channel,
1688                                         ssid + 2, ssid_len,
1689                                         NULL, 0, true);
1690
1691         return skb;
1692 }
1693 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1694
1695 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1696 {
1697         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1698         struct ieee80211_local *local = sdata->local;
1699         u8 bssid[ETH_ALEN];
1700         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1701
1702         mutex_lock(&ifmgd->mtx);
1703         if (!ifmgd->associated) {
1704                 mutex_unlock(&ifmgd->mtx);
1705                 return;
1706         }
1707
1708         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1709
1710         sdata_info(sdata, "Connection to AP %pM lost\n", bssid);
1711
1712         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1713                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1714                                false, frame_buf);
1715         mutex_unlock(&ifmgd->mtx);
1716
1717         /*
1718          * must be outside lock due to cfg80211,
1719          * but that's not a problem.
1720          */
1721         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1722
1723         mutex_lock(&local->mtx);
1724         ieee80211_recalc_idle(local);
1725         mutex_unlock(&local->mtx);
1726 }
1727
1728 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1729 {
1730         struct ieee80211_sub_if_data *sdata =
1731                 container_of(work, struct ieee80211_sub_if_data,
1732                              u.mgd.beacon_connection_loss_work);
1733         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1734         struct sta_info *sta;
1735
1736         if (ifmgd->associated) {
1737                 rcu_read_lock();
1738                 sta = sta_info_get(sdata, ifmgd->bssid);
1739                 if (sta)
1740                         sta->beacon_loss_count++;
1741                 rcu_read_unlock();
1742         }
1743
1744         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1745                 __ieee80211_connection_loss(sdata);
1746         else
1747                 ieee80211_mgd_probe_ap(sdata, true);
1748 }
1749
1750 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1751 {
1752         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1753         struct ieee80211_hw *hw = &sdata->local->hw;
1754
1755         trace_api_beacon_loss(sdata);
1756
1757         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1758         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1759 }
1760 EXPORT_SYMBOL(ieee80211_beacon_loss);
1761
1762 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1763 {
1764         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1765         struct ieee80211_hw *hw = &sdata->local->hw;
1766
1767         trace_api_connection_loss(sdata);
1768
1769         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1770         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1771 }
1772 EXPORT_SYMBOL(ieee80211_connection_loss);
1773
1774
1775 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1776                                         bool assoc)
1777 {
1778         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1779
1780         lockdep_assert_held(&sdata->u.mgd.mtx);
1781
1782         if (!assoc) {
1783                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1784
1785                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1786                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1787         }
1788
1789         cfg80211_put_bss(auth_data->bss);
1790         kfree(auth_data);
1791         sdata->u.mgd.auth_data = NULL;
1792 }
1793
1794 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1795                                      struct ieee80211_mgmt *mgmt, size_t len)
1796 {
1797         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1798         u8 *pos;
1799         struct ieee802_11_elems elems;
1800
1801         pos = mgmt->u.auth.variable;
1802         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1803         if (!elems.challenge)
1804                 return;
1805         auth_data->expected_transaction = 4;
1806         drv_mgd_prepare_tx(sdata->local, sdata);
1807         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1808                             elems.challenge - 2, elems.challenge_len + 2,
1809                             auth_data->bss->bssid, auth_data->bss->bssid,
1810                             auth_data->key, auth_data->key_len,
1811                             auth_data->key_idx);
1812 }
1813
1814 static enum rx_mgmt_action __must_check
1815 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1816                        struct ieee80211_mgmt *mgmt, size_t len)
1817 {
1818         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1819         u8 bssid[ETH_ALEN];
1820         u16 auth_alg, auth_transaction, status_code;
1821         struct sta_info *sta;
1822
1823         lockdep_assert_held(&ifmgd->mtx);
1824
1825         if (len < 24 + 6)
1826                 return RX_MGMT_NONE;
1827
1828         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1829                 return RX_MGMT_NONE;
1830
1831         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1832
1833         if (!ether_addr_equal(bssid, mgmt->bssid))
1834                 return RX_MGMT_NONE;
1835
1836         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1837         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1838         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1839
1840         if (auth_alg != ifmgd->auth_data->algorithm ||
1841             auth_transaction != ifmgd->auth_data->expected_transaction)
1842                 return RX_MGMT_NONE;
1843
1844         if (status_code != WLAN_STATUS_SUCCESS) {
1845                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1846                            mgmt->sa, status_code);
1847                 ieee80211_destroy_auth_data(sdata, false);
1848                 return RX_MGMT_CFG80211_RX_AUTH;
1849         }
1850
1851         switch (ifmgd->auth_data->algorithm) {
1852         case WLAN_AUTH_OPEN:
1853         case WLAN_AUTH_LEAP:
1854         case WLAN_AUTH_FT:
1855                 break;
1856         case WLAN_AUTH_SHARED_KEY:
1857                 if (ifmgd->auth_data->expected_transaction != 4) {
1858                         ieee80211_auth_challenge(sdata, mgmt, len);
1859                         /* need another frame */
1860                         return RX_MGMT_NONE;
1861                 }
1862                 break;
1863         default:
1864                 WARN_ONCE(1, "invalid auth alg %d",
1865                           ifmgd->auth_data->algorithm);
1866                 return RX_MGMT_NONE;
1867         }
1868
1869         sdata_info(sdata, "authenticated\n");
1870         ifmgd->auth_data->done = true;
1871         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1872         run_again(ifmgd, ifmgd->auth_data->timeout);
1873
1874         /* move station state to auth */
1875         mutex_lock(&sdata->local->sta_mtx);
1876         sta = sta_info_get(sdata, bssid);
1877         if (!sta) {
1878                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1879                 goto out_err;
1880         }
1881         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1882                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1883                 goto out_err;
1884         }
1885         mutex_unlock(&sdata->local->sta_mtx);
1886
1887         return RX_MGMT_CFG80211_RX_AUTH;
1888  out_err:
1889         mutex_unlock(&sdata->local->sta_mtx);
1890         /* ignore frame -- wait for timeout */
1891         return RX_MGMT_NONE;
1892 }
1893
1894
1895 static enum rx_mgmt_action __must_check
1896 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1897                          struct ieee80211_mgmt *mgmt, size_t len)
1898 {
1899         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1900         const u8 *bssid = NULL;
1901         u16 reason_code;
1902
1903         lockdep_assert_held(&ifmgd->mtx);
1904
1905         if (len < 24 + 2)
1906                 return RX_MGMT_NONE;
1907
1908         if (!ifmgd->associated ||
1909             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1910                 return RX_MGMT_NONE;
1911
1912         bssid = ifmgd->associated->bssid;
1913
1914         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1915
1916         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1917                    bssid, reason_code);
1918
1919         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1920
1921         mutex_lock(&sdata->local->mtx);
1922         ieee80211_recalc_idle(sdata->local);
1923         mutex_unlock(&sdata->local->mtx);
1924
1925         return RX_MGMT_CFG80211_DEAUTH;
1926 }
1927
1928
1929 static enum rx_mgmt_action __must_check
1930 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1931                            struct ieee80211_mgmt *mgmt, size_t len)
1932 {
1933         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1934         u16 reason_code;
1935
1936         lockdep_assert_held(&ifmgd->mtx);
1937
1938         if (len < 24 + 2)
1939                 return RX_MGMT_NONE;
1940
1941         if (!ifmgd->associated ||
1942             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1943                 return RX_MGMT_NONE;
1944
1945         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1946
1947         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1948                    mgmt->sa, reason_code);
1949
1950         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1951
1952         mutex_lock(&sdata->local->mtx);
1953         ieee80211_recalc_idle(sdata->local);
1954         mutex_unlock(&sdata->local->mtx);
1955
1956         return RX_MGMT_CFG80211_DISASSOC;
1957 }
1958
1959 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1960                                 u8 *supp_rates, unsigned int supp_rates_len,
1961                                 u32 *rates, u32 *basic_rates,
1962                                 bool *have_higher_than_11mbit,
1963                                 int *min_rate, int *min_rate_index)
1964 {
1965         int i, j;
1966
1967         for (i = 0; i < supp_rates_len; i++) {
1968                 int rate = (supp_rates[i] & 0x7f) * 5;
1969                 bool is_basic = !!(supp_rates[i] & 0x80);
1970
1971                 if (rate > 110)
1972                         *have_higher_than_11mbit = true;
1973
1974                 /*
1975                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1976                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1977                  *
1978                  * Note: Even through the membership selector and the basic
1979                  *       rate flag share the same bit, they are not exactly
1980                  *       the same.
1981                  */
1982                 if (!!(supp_rates[i] & 0x80) &&
1983                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1984                         continue;
1985
1986                 for (j = 0; j < sband->n_bitrates; j++) {
1987                         if (sband->bitrates[j].bitrate == rate) {
1988                                 *rates |= BIT(j);
1989                                 if (is_basic)
1990                                         *basic_rates |= BIT(j);
1991                                 if (rate < *min_rate) {
1992                                         *min_rate = rate;
1993                                         *min_rate_index = j;
1994                                 }
1995                                 break;
1996                         }
1997                 }
1998         }
1999 }
2000
2001 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2002                                          bool assoc)
2003 {
2004         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2005
2006         lockdep_assert_held(&sdata->u.mgd.mtx);
2007
2008         if (!assoc) {
2009                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2010
2011                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2012                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2013         }
2014
2015         kfree(assoc_data);
2016         sdata->u.mgd.assoc_data = NULL;
2017 }
2018
2019 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2020                                     struct cfg80211_bss *cbss,
2021                                     struct ieee80211_mgmt *mgmt, size_t len)
2022 {
2023         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2024         struct ieee80211_local *local = sdata->local;
2025         struct ieee80211_supported_band *sband;
2026         struct sta_info *sta;
2027         u8 *pos;
2028         u16 capab_info, aid;
2029         struct ieee802_11_elems elems;
2030         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2031         u32 changed = 0;
2032         int err;
2033
2034         /* AssocResp and ReassocResp have identical structure */
2035
2036         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2037         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2038
2039         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2040                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2041                            aid);
2042         aid &= ~(BIT(15) | BIT(14));
2043
2044         ifmgd->broken_ap = false;
2045
2046         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2047                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2048                            aid);
2049                 aid = 0;
2050                 ifmgd->broken_ap = true;
2051         }
2052
2053         pos = mgmt->u.assoc_resp.variable;
2054         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2055
2056         if (!elems.supp_rates) {
2057                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2058                 return false;
2059         }
2060
2061         ifmgd->aid = aid;
2062
2063         mutex_lock(&sdata->local->sta_mtx);
2064         /*
2065          * station info was already allocated and inserted before
2066          * the association and should be available to us
2067          */
2068         sta = sta_info_get(sdata, cbss->bssid);
2069         if (WARN_ON(!sta)) {
2070                 mutex_unlock(&sdata->local->sta_mtx);
2071                 return false;
2072         }
2073
2074         sband = local->hw.wiphy->bands[local->oper_channel->band];
2075
2076         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2077                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2078                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2079
2080         sta->supports_40mhz =
2081                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2082
2083         rate_control_rate_init(sta);
2084
2085         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2086                 set_sta_flag(sta, WLAN_STA_MFP);
2087
2088         if (elems.wmm_param)
2089                 set_sta_flag(sta, WLAN_STA_WME);
2090
2091         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2092         if (!err)
2093                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2094         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2095                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2096         if (err) {
2097                 sdata_info(sdata,
2098                            "failed to move station %pM to desired state\n",
2099                            sta->sta.addr);
2100                 WARN_ON(__sta_info_destroy(sta));
2101                 mutex_unlock(&sdata->local->sta_mtx);
2102                 return false;
2103         }
2104
2105         mutex_unlock(&sdata->local->sta_mtx);
2106
2107         /*
2108          * Always handle WMM once after association regardless
2109          * of the first value the AP uses. Setting -1 here has
2110          * that effect because the AP values is an unsigned
2111          * 4-bit value.
2112          */
2113         ifmgd->wmm_last_param_set = -1;
2114
2115         if (elems.wmm_param)
2116                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2117                                          elems.wmm_param_len);
2118         else
2119                 ieee80211_set_wmm_default(sdata, false);
2120         changed |= BSS_CHANGED_QOS;
2121
2122         if (elems.ht_operation && elems.wmm_param &&
2123             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2124                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2125                                                   cbss->bssid, false);
2126
2127         /* set AID and assoc capability,
2128          * ieee80211_set_associated() will tell the driver */
2129         bss_conf->aid = aid;
2130         bss_conf->assoc_capability = capab_info;
2131         ieee80211_set_associated(sdata, cbss, changed);
2132
2133         /*
2134          * If we're using 4-addr mode, let the AP know that we're
2135          * doing so, so that it can create the STA VLAN on its side
2136          */
2137         if (ifmgd->use_4addr)
2138                 ieee80211_send_4addr_nullfunc(local, sdata);
2139
2140         /*
2141          * Start timer to probe the connection to the AP now.
2142          * Also start the timer that will detect beacon loss.
2143          */
2144         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2145         ieee80211_sta_reset_beacon_monitor(sdata);
2146
2147         return true;
2148 }
2149
2150 static enum rx_mgmt_action __must_check
2151 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2152                              struct ieee80211_mgmt *mgmt, size_t len,
2153                              struct cfg80211_bss **bss)
2154 {
2155         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2156         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2157         u16 capab_info, status_code, aid;
2158         struct ieee802_11_elems elems;
2159         u8 *pos;
2160         bool reassoc;
2161
2162         lockdep_assert_held(&ifmgd->mtx);
2163
2164         if (!assoc_data)
2165                 return RX_MGMT_NONE;
2166         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2167                 return RX_MGMT_NONE;
2168
2169         /*
2170          * AssocResp and ReassocResp have identical structure, so process both
2171          * of them in this function.
2172          */
2173
2174         if (len < 24 + 6)
2175                 return RX_MGMT_NONE;
2176
2177         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2178         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2179         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2180         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2181
2182         sdata_info(sdata,
2183                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2184                    reassoc ? "Rea" : "A", mgmt->sa,
2185                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2186
2187         pos = mgmt->u.assoc_resp.variable;
2188         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2189
2190         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2191             elems.timeout_int && elems.timeout_int_len == 5 &&
2192             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2193                 u32 tu, ms;
2194                 tu = get_unaligned_le32(elems.timeout_int + 1);
2195                 ms = tu * 1024 / 1000;
2196                 sdata_info(sdata,
2197                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2198                            mgmt->sa, tu, ms);
2199                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2200                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2201                         run_again(ifmgd, assoc_data->timeout);
2202                 return RX_MGMT_NONE;
2203         }
2204
2205         *bss = assoc_data->bss;
2206
2207         if (status_code != WLAN_STATUS_SUCCESS) {
2208                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2209                            mgmt->sa, status_code);
2210                 ieee80211_destroy_assoc_data(sdata, false);
2211         } else {
2212                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2213                         /* oops -- internal error -- send timeout for now */
2214                         ieee80211_destroy_assoc_data(sdata, false);
2215                         cfg80211_put_bss(*bss);
2216                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2217                 }
2218                 sdata_info(sdata, "associated\n");
2219
2220                 /*
2221                  * destroy assoc_data afterwards, as otherwise an idle
2222                  * recalc after assoc_data is NULL but before associated
2223                  * is set can cause the interface to go idle
2224                  */
2225                 ieee80211_destroy_assoc_data(sdata, true);
2226         }
2227
2228         return RX_MGMT_CFG80211_RX_ASSOC;
2229 }
2230 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2231                                   struct ieee80211_mgmt *mgmt,
2232                                   size_t len,
2233                                   struct ieee80211_rx_status *rx_status,
2234                                   struct ieee802_11_elems *elems,
2235                                   bool beacon)
2236 {
2237         struct ieee80211_local *local = sdata->local;
2238         int freq;
2239         struct ieee80211_bss *bss;
2240         struct ieee80211_channel *channel;
2241         bool need_ps = false;
2242
2243         if (sdata->u.mgd.associated &&
2244             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2245                 bss = (void *)sdata->u.mgd.associated->priv;
2246                 /* not previously set so we may need to recalc */
2247                 need_ps = !bss->dtim_period;
2248         }
2249
2250         if (elems->ds_params && elems->ds_params_len == 1)
2251                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2252                                                       rx_status->band);
2253         else
2254                 freq = rx_status->freq;
2255
2256         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2257
2258         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2259                 return;
2260
2261         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2262                                         channel, beacon);
2263         if (bss)
2264                 ieee80211_rx_bss_put(local, bss);
2265
2266         if (!sdata->u.mgd.associated)
2267                 return;
2268
2269         if (need_ps) {
2270                 mutex_lock(&local->iflist_mtx);
2271                 ieee80211_recalc_ps(local, -1);
2272                 mutex_unlock(&local->iflist_mtx);
2273         }
2274
2275         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2276             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2277                                                         ETH_ALEN) == 0)) {
2278                 struct ieee80211_channel_sw_ie *sw_elem =
2279                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2280                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2281                                                  bss, rx_status->mactime);
2282         }
2283 }
2284
2285
2286 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2287                                          struct sk_buff *skb)
2288 {
2289         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2290         struct ieee80211_if_managed *ifmgd;
2291         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2292         size_t baselen, len = skb->len;
2293         struct ieee802_11_elems elems;
2294
2295         ifmgd = &sdata->u.mgd;
2296
2297         ASSERT_MGD_MTX(ifmgd);
2298
2299         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2300                 return; /* ignore ProbeResp to foreign address */
2301
2302         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2303         if (baselen > len)
2304                 return;
2305
2306         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2307                                 &elems);
2308
2309         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2310
2311         if (ifmgd->associated &&
2312             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2313                 ieee80211_reset_ap_probe(sdata);
2314
2315         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2316             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2317                 /* got probe response, continue with auth */
2318                 sdata_info(sdata, "direct probe responded\n");
2319                 ifmgd->auth_data->tries = 0;
2320                 ifmgd->auth_data->timeout = jiffies;
2321                 run_again(ifmgd, ifmgd->auth_data->timeout);
2322         }
2323 }
2324
2325 /*
2326  * This is the canonical list of information elements we care about,
2327  * the filter code also gives us all changes to the Microsoft OUI
2328  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2329  *
2330  * We implement beacon filtering in software since that means we can
2331  * avoid processing the frame here and in cfg80211, and userspace
2332  * will not be able to tell whether the hardware supports it or not.
2333  *
2334  * XXX: This list needs to be dynamic -- userspace needs to be able to
2335  *      add items it requires. It also needs to be able to tell us to
2336  *      look out for other vendor IEs.
2337  */
2338 static const u64 care_about_ies =
2339         (1ULL << WLAN_EID_COUNTRY) |
2340         (1ULL << WLAN_EID_ERP_INFO) |
2341         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2342         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2343         (1ULL << WLAN_EID_HT_CAPABILITY) |
2344         (1ULL << WLAN_EID_HT_OPERATION);
2345
2346 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2347                                      struct ieee80211_mgmt *mgmt,
2348                                      size_t len,
2349                                      struct ieee80211_rx_status *rx_status)
2350 {
2351         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2352         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2353         size_t baselen;
2354         struct ieee802_11_elems elems;
2355         struct ieee80211_local *local = sdata->local;
2356         u32 changed = 0;
2357         bool erp_valid, directed_tim = false;
2358         u8 erp_value = 0;
2359         u32 ncrc;
2360         u8 *bssid;
2361
2362         lockdep_assert_held(&ifmgd->mtx);
2363
2364         /* Process beacon from the current BSS */
2365         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2366         if (baselen > len)
2367                 return;
2368
2369         if (rx_status->freq != local->oper_channel->center_freq)
2370                 return;
2371
2372         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2373             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2374                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2375                                        len - baselen, &elems);
2376
2377                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2378                                       false);
2379                 ifmgd->assoc_data->have_beacon = true;
2380                 ifmgd->assoc_data->sent_assoc = false;
2381                 /* continue assoc process */
2382                 ifmgd->assoc_data->timeout = jiffies;
2383                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2384                 return;
2385         }
2386
2387         if (!ifmgd->associated ||
2388             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2389                 return;
2390         bssid = ifmgd->associated->bssid;
2391
2392         /* Track average RSSI from the Beacon frames of the current AP */
2393         ifmgd->last_beacon_signal = rx_status->signal;
2394         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2395                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2396                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2397                 ifmgd->last_cqm_event_signal = 0;
2398                 ifmgd->count_beacon_signal = 1;
2399                 ifmgd->last_ave_beacon_signal = 0;
2400         } else {
2401                 ifmgd->ave_beacon_signal =
2402                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2403                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2404                          ifmgd->ave_beacon_signal) / 16;
2405                 ifmgd->count_beacon_signal++;
2406         }
2407
2408         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2409             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2410                 int sig = ifmgd->ave_beacon_signal;
2411                 int last_sig = ifmgd->last_ave_beacon_signal;
2412
2413                 /*
2414                  * if signal crosses either of the boundaries, invoke callback
2415                  * with appropriate parameters
2416                  */
2417                 if (sig > ifmgd->rssi_max_thold &&
2418                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2419                         ifmgd->last_ave_beacon_signal = sig;
2420                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2421                 } else if (sig < ifmgd->rssi_min_thold &&
2422                            (last_sig >= ifmgd->rssi_max_thold ||
2423                            last_sig == 0)) {
2424                         ifmgd->last_ave_beacon_signal = sig;
2425                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2426                 }
2427         }
2428
2429         if (bss_conf->cqm_rssi_thold &&
2430             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2431             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2432                 int sig = ifmgd->ave_beacon_signal / 16;
2433                 int last_event = ifmgd->last_cqm_event_signal;
2434                 int thold = bss_conf->cqm_rssi_thold;
2435                 int hyst = bss_conf->cqm_rssi_hyst;
2436                 if (sig < thold &&
2437                     (last_event == 0 || sig < last_event - hyst)) {
2438                         ifmgd->last_cqm_event_signal = sig;
2439                         ieee80211_cqm_rssi_notify(
2440                                 &sdata->vif,
2441                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2442                                 GFP_KERNEL);
2443                 } else if (sig > thold &&
2444                            (last_event == 0 || sig > last_event + hyst)) {
2445                         ifmgd->last_cqm_event_signal = sig;
2446                         ieee80211_cqm_rssi_notify(
2447                                 &sdata->vif,
2448                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2449                                 GFP_KERNEL);
2450                 }
2451         }
2452
2453         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2454                 mlme_dbg_ratelimited(sdata,
2455                                      "cancelling probereq poll due to a received beacon\n");
2456                 mutex_lock(&local->mtx);
2457                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2458                 ieee80211_run_deferred_scan(local);
2459                 mutex_unlock(&local->mtx);
2460
2461                 mutex_lock(&local->iflist_mtx);
2462                 ieee80211_recalc_ps(local, -1);
2463                 mutex_unlock(&local->iflist_mtx);
2464         }
2465
2466         /*
2467          * Push the beacon loss detection into the future since
2468          * we are processing a beacon from the AP just now.
2469          */
2470         ieee80211_sta_reset_beacon_monitor(sdata);
2471
2472         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2473         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2474                                           len - baselen, &elems,
2475                                           care_about_ies, ncrc);
2476
2477         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2478                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2479                                                    ifmgd->aid);
2480
2481         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2482                 if (directed_tim) {
2483                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2484                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2485                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2486                                         ieee80211_hw_config(local,
2487                                                             IEEE80211_CONF_CHANGE_PS);
2488                                 }
2489                                 ieee80211_send_nullfunc(local, sdata, 0);
2490                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2491                                 local->pspolling = true;
2492
2493                                 /*
2494                                  * Here is assumed that the driver will be
2495                                  * able to send ps-poll frame and receive a
2496                                  * response even though power save mode is
2497                                  * enabled, but some drivers might require
2498                                  * to disable power save here. This needs
2499                                  * to be investigated.
2500                                  */
2501                                 ieee80211_send_pspoll(local, sdata);
2502                         }
2503                 }
2504         }
2505
2506         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2507                 return;
2508         ifmgd->beacon_crc = ncrc;
2509         ifmgd->beacon_crc_valid = true;
2510
2511         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2512                               true);
2513
2514         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2515                                      elems.wmm_param_len))
2516                 changed |= BSS_CHANGED_QOS;
2517
2518         if (elems.erp_info && elems.erp_info_len >= 1) {
2519                 erp_valid = true;
2520                 erp_value = elems.erp_info[0];
2521         } else {
2522                 erp_valid = false;
2523         }
2524         changed |= ieee80211_handle_bss_capability(sdata,
2525                         le16_to_cpu(mgmt->u.beacon.capab_info),
2526                         erp_valid, erp_value);
2527
2528
2529         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2530             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2531                 struct ieee80211_supported_band *sband;
2532
2533                 sband = local->hw.wiphy->bands[local->oper_channel->band];
2534
2535                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2536                                                   bssid, true);
2537         }
2538
2539         /* Note: country IE parsing is done for us by cfg80211 */
2540         if (elems.country_elem) {
2541                 /* TODO: IBSS also needs this */
2542                 if (elems.pwr_constr_elem)
2543                         ieee80211_handle_pwr_constr(sdata,
2544                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2545                                 elems.pwr_constr_elem,
2546                                 elems.pwr_constr_elem_len);
2547         }
2548
2549         ieee80211_bss_info_change_notify(sdata, changed);
2550 }
2551
2552 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2553                                   struct sk_buff *skb)
2554 {
2555         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2556         struct ieee80211_rx_status *rx_status;
2557         struct ieee80211_mgmt *mgmt;
2558         struct cfg80211_bss *bss = NULL;
2559         enum rx_mgmt_action rma = RX_MGMT_NONE;
2560         u16 fc;
2561
2562         rx_status = (struct ieee80211_rx_status *) skb->cb;
2563         mgmt = (struct ieee80211_mgmt *) skb->data;
2564         fc = le16_to_cpu(mgmt->frame_control);
2565
2566         mutex_lock(&ifmgd->mtx);
2567
2568         switch (fc & IEEE80211_FCTL_STYPE) {
2569         case IEEE80211_STYPE_BEACON:
2570                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2571                 break;
2572         case IEEE80211_STYPE_PROBE_RESP:
2573                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2574                 break;
2575         case IEEE80211_STYPE_AUTH:
2576                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2577                 break;
2578         case IEEE80211_STYPE_DEAUTH:
2579                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2580                 break;
2581         case IEEE80211_STYPE_DISASSOC:
2582                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2583                 break;
2584         case IEEE80211_STYPE_ASSOC_RESP:
2585         case IEEE80211_STYPE_REASSOC_RESP:
2586                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2587                 break;
2588         case IEEE80211_STYPE_ACTION:
2589                 switch (mgmt->u.action.category) {
2590                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2591                         ieee80211_sta_process_chanswitch(sdata,
2592                                         &mgmt->u.action.u.chan_switch.sw_elem,
2593                                         (void *)ifmgd->associated->priv,
2594                                         rx_status->mactime);
2595                         break;
2596                 }
2597         }
2598         mutex_unlock(&ifmgd->mtx);
2599
2600         switch (rma) {
2601         case RX_MGMT_NONE:
2602                 /* no action */
2603                 break;
2604         case RX_MGMT_CFG80211_DEAUTH:
2605                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2606                 break;
2607         case RX_MGMT_CFG80211_DISASSOC:
2608                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2609                 break;
2610         case RX_MGMT_CFG80211_RX_AUTH:
2611                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2612                 break;
2613         case RX_MGMT_CFG80211_RX_ASSOC:
2614                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2615                 break;
2616         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2617                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2618                 break;
2619         default:
2620                 WARN(1, "unexpected: %d", rma);
2621         }
2622 }
2623
2624 static void ieee80211_sta_timer(unsigned long data)
2625 {
2626         struct ieee80211_sub_if_data *sdata =
2627                 (struct ieee80211_sub_if_data *) data;
2628         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2629         struct ieee80211_local *local = sdata->local;
2630
2631         if (local->quiescing) {
2632                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2633                 return;
2634         }
2635
2636         ieee80211_queue_work(&local->hw, &sdata->work);
2637 }
2638
2639 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2640                                           u8 *bssid, u8 reason)
2641 {
2642         struct ieee80211_local *local = sdata->local;
2643         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2644         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2645
2646         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2647                                false, frame_buf);
2648         mutex_unlock(&ifmgd->mtx);
2649
2650         /*
2651          * must be outside lock due to cfg80211,
2652          * but that's not a problem.
2653          */
2654         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2655
2656         mutex_lock(&local->mtx);
2657         ieee80211_recalc_idle(local);
2658         mutex_unlock(&local->mtx);
2659
2660         mutex_lock(&ifmgd->mtx);
2661 }
2662
2663 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2664 {
2665         struct ieee80211_local *local = sdata->local;
2666         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2667         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2668
2669         lockdep_assert_held(&ifmgd->mtx);
2670
2671         if (WARN_ON_ONCE(!auth_data))
2672                 return -EINVAL;
2673
2674         auth_data->tries++;
2675
2676         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2677                 sdata_info(sdata, "authentication with %pM timed out\n",
2678                            auth_data->bss->bssid);
2679
2680                 /*
2681                  * Most likely AP is not in the range so remove the
2682                  * bss struct for that AP.
2683                  */
2684                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2685
2686                 return -ETIMEDOUT;
2687         }
2688
2689         drv_mgd_prepare_tx(local, sdata);
2690
2691         if (auth_data->bss->proberesp_ies) {
2692                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2693                            auth_data->bss->bssid, auth_data->tries,
2694                            IEEE80211_AUTH_MAX_TRIES);
2695
2696                 auth_data->expected_transaction = 2;
2697                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2698                                     auth_data->ie, auth_data->ie_len,
2699                                     auth_data->bss->bssid,
2700                                     auth_data->bss->bssid, NULL, 0, 0);
2701         } else {
2702                 const u8 *ssidie;
2703
2704                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2705                            auth_data->bss->bssid, auth_data->tries,
2706                            IEEE80211_AUTH_MAX_TRIES);
2707
2708                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2709                 if (!ssidie)
2710                         return -EINVAL;
2711                 /*
2712                  * Direct probe is sent to broadcast address as some APs
2713                  * will not answer to direct packet in unassociated state.
2714                  */
2715                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2716                                          NULL, 0, (u32) -1, true, false);
2717         }
2718
2719         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2720         run_again(ifmgd, auth_data->timeout);
2721
2722         return 0;
2723 }
2724
2725 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2726 {
2727         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2728         struct ieee80211_local *local = sdata->local;
2729
2730         lockdep_assert_held(&sdata->u.mgd.mtx);
2731
2732         assoc_data->tries++;
2733         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2734                 sdata_info(sdata, "association with %pM timed out\n",
2735                            assoc_data->bss->bssid);
2736
2737                 /*
2738                  * Most likely AP is not in the range so remove the
2739                  * bss struct for that AP.
2740                  */
2741                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2742
2743                 return -ETIMEDOUT;
2744         }
2745
2746         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2747                    assoc_data->bss->bssid, assoc_data->tries,
2748                    IEEE80211_ASSOC_MAX_TRIES);
2749         ieee80211_send_assoc(sdata);
2750
2751         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2752         run_again(&sdata->u.mgd, assoc_data->timeout);
2753
2754         return 0;
2755 }
2756
2757 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2758 {
2759         struct ieee80211_local *local = sdata->local;
2760         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2761
2762         mutex_lock(&ifmgd->mtx);
2763
2764         if (ifmgd->auth_data &&
2765             time_after(jiffies, ifmgd->auth_data->timeout)) {
2766                 if (ifmgd->auth_data->done) {
2767                         /*
2768                          * ok ... we waited for assoc but userspace didn't,
2769                          * so let's just kill the auth data
2770                          */
2771                         ieee80211_destroy_auth_data(sdata, false);
2772                 } else if (ieee80211_probe_auth(sdata)) {
2773                         u8 bssid[ETH_ALEN];
2774
2775                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2776
2777                         ieee80211_destroy_auth_data(sdata, false);
2778
2779                         mutex_unlock(&ifmgd->mtx);
2780                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2781                         mutex_lock(&ifmgd->mtx);
2782                 }
2783         } else if (ifmgd->auth_data)
2784                 run_again(ifmgd, ifmgd->auth_data->timeout);
2785
2786         if (ifmgd->assoc_data &&
2787             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2788                 if (!ifmgd->assoc_data->have_beacon ||
2789                     ieee80211_do_assoc(sdata)) {
2790                         u8 bssid[ETH_ALEN];
2791
2792                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2793
2794                         ieee80211_destroy_assoc_data(sdata, false);
2795
2796                         mutex_unlock(&ifmgd->mtx);
2797                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2798                         mutex_lock(&ifmgd->mtx);
2799                 }
2800         } else if (ifmgd->assoc_data)
2801                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2802
2803         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2804                             IEEE80211_STA_CONNECTION_POLL) &&
2805             ifmgd->associated) {
2806                 u8 bssid[ETH_ALEN];
2807                 int max_tries;
2808
2809                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2810
2811                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2812                         max_tries = max_nullfunc_tries;
2813                 else
2814                         max_tries = max_probe_tries;
2815
2816                 /* ACK received for nullfunc probing frame */
2817                 if (!ifmgd->probe_send_count)
2818                         ieee80211_reset_ap_probe(sdata);
2819                 else if (ifmgd->nullfunc_failed) {
2820                         if (ifmgd->probe_send_count < max_tries) {
2821                                 mlme_dbg(sdata,
2822                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2823                                          bssid, ifmgd->probe_send_count,
2824                                          max_tries);
2825                                 ieee80211_mgd_probe_ap_send(sdata);
2826                         } else {
2827                                 mlme_dbg(sdata,
2828                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2829                                          bssid);
2830                                 ieee80211_sta_connection_lost(sdata, bssid,
2831                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2832                         }
2833                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2834                         run_again(ifmgd, ifmgd->probe_timeout);
2835                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2836                         mlme_dbg(sdata,
2837                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2838                                  bssid, probe_wait_ms);
2839                         ieee80211_sta_connection_lost(sdata, bssid,
2840                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2841                 } else if (ifmgd->probe_send_count < max_tries) {
2842                         mlme_dbg(sdata,
2843                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2844                                  bssid, probe_wait_ms,
2845                                  ifmgd->probe_send_count, max_tries);
2846                         ieee80211_mgd_probe_ap_send(sdata);
2847                 } else {
2848                         /*
2849                          * We actually lost the connection ... or did we?
2850                          * Let's make sure!
2851                          */
2852                         wiphy_debug(local->hw.wiphy,
2853                                     "%s: No probe response from AP %pM"
2854                                     " after %dms, disconnecting.\n",
2855                                     sdata->name,
2856                                     bssid, probe_wait_ms);
2857
2858                         ieee80211_sta_connection_lost(sdata, bssid,
2859                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2860                 }
2861         }
2862
2863         mutex_unlock(&ifmgd->mtx);
2864
2865         mutex_lock(&local->mtx);
2866         ieee80211_recalc_idle(local);
2867         mutex_unlock(&local->mtx);
2868 }
2869
2870 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2871 {
2872         struct ieee80211_sub_if_data *sdata =
2873                 (struct ieee80211_sub_if_data *) data;
2874         struct ieee80211_local *local = sdata->local;
2875
2876         if (local->quiescing)
2877                 return;
2878
2879         ieee80211_queue_work(&sdata->local->hw,
2880                              &sdata->u.mgd.beacon_connection_loss_work);
2881 }
2882
2883 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2884 {
2885         struct ieee80211_sub_if_data *sdata =
2886                 (struct ieee80211_sub_if_data *) data;
2887         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2888         struct ieee80211_local *local = sdata->local;
2889
2890         if (local->quiescing)
2891                 return;
2892
2893         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2894 }
2895
2896 static void ieee80211_sta_monitor_work(struct work_struct *work)
2897 {
2898         struct ieee80211_sub_if_data *sdata =
2899                 container_of(work, struct ieee80211_sub_if_data,
2900                              u.mgd.monitor_work);
2901
2902         ieee80211_mgd_probe_ap(sdata, false);
2903 }
2904
2905 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2906 {
2907         u32 flags;
2908
2909         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2910                 __ieee80211_stop_poll(sdata);
2911
2912                 /* let's probe the connection once */
2913                 flags = sdata->local->hw.flags;
2914                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2915                         ieee80211_queue_work(&sdata->local->hw,
2916                                              &sdata->u.mgd.monitor_work);
2917                 /* and do all the other regular work too */
2918                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2919         }
2920 }
2921
2922 #ifdef CONFIG_PM
2923 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2924 {
2925         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2926
2927         /*
2928          * we need to use atomic bitops for the running bits
2929          * only because both timers might fire at the same
2930          * time -- the code here is properly synchronised.
2931          */
2932
2933         cancel_work_sync(&ifmgd->request_smps_work);
2934
2935         cancel_work_sync(&ifmgd->monitor_work);
2936         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2937         if (del_timer_sync(&ifmgd->timer))
2938                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2939
2940         cancel_work_sync(&ifmgd->chswitch_work);
2941         if (del_timer_sync(&ifmgd->chswitch_timer))
2942                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2943
2944         /* these will just be re-established on connection */
2945         del_timer_sync(&ifmgd->conn_mon_timer);
2946         del_timer_sync(&ifmgd->bcn_mon_timer);
2947 }
2948
2949 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2950 {
2951         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2952
2953         if (!ifmgd->associated)
2954                 return;
2955
2956         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2957                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2958                 mutex_lock(&ifmgd->mtx);
2959                 if (ifmgd->associated) {
2960                         mlme_dbg(sdata,
2961                                  "driver requested disconnect after resume\n");
2962                         ieee80211_sta_connection_lost(sdata,
2963                                 ifmgd->associated->bssid,
2964                                 WLAN_REASON_UNSPECIFIED);
2965                         mutex_unlock(&ifmgd->mtx);
2966                         return;
2967                 }
2968                 mutex_unlock(&ifmgd->mtx);
2969         }
2970
2971         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2972                 add_timer(&ifmgd->timer);
2973         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2974                 add_timer(&ifmgd->chswitch_timer);
2975         ieee80211_sta_reset_beacon_monitor(sdata);
2976
2977         mutex_lock(&sdata->local->mtx);
2978         ieee80211_restart_sta_timer(sdata);
2979         mutex_unlock(&sdata->local->mtx);
2980 }
2981 #endif
2982
2983 /* interface setup */
2984 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2985 {
2986         struct ieee80211_if_managed *ifmgd;
2987
2988         ifmgd = &sdata->u.mgd;
2989         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2990         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2991         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2992                   ieee80211_beacon_connection_loss_work);
2993         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2994         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2995                     (unsigned long) sdata);
2996         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2997                     (unsigned long) sdata);
2998         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2999                     (unsigned long) sdata);
3000         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3001                     (unsigned long) sdata);
3002
3003         ifmgd->flags = 0;
3004         ifmgd->powersave = sdata->wdev.ps;
3005         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3006         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3007
3008         mutex_init(&ifmgd->mtx);
3009
3010         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3011                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3012         else
3013                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3014 }
3015
3016 /* scan finished notification */
3017 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3018 {
3019         struct ieee80211_sub_if_data *sdata;
3020
3021         /* Restart STA timers */
3022         rcu_read_lock();
3023         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3024                 ieee80211_restart_sta_timer(sdata);
3025         rcu_read_unlock();
3026 }
3027
3028 int ieee80211_max_network_latency(struct notifier_block *nb,
3029                                   unsigned long data, void *dummy)
3030 {
3031         s32 latency_usec = (s32) data;
3032         struct ieee80211_local *local =
3033                 container_of(nb, struct ieee80211_local,
3034                              network_latency_notifier);
3035
3036         mutex_lock(&local->iflist_mtx);
3037         ieee80211_recalc_ps(local, latency_usec);
3038         mutex_unlock(&local->iflist_mtx);
3039
3040         return 0;
3041 }
3042
3043 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3044                                   struct cfg80211_bss *cbss)
3045 {
3046         struct ieee80211_local *local = sdata->local;
3047         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3048         int ht_cfreq;
3049         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3050         const u8 *ht_oper_ie;
3051         const struct ieee80211_ht_operation *ht_oper = NULL;
3052         struct ieee80211_supported_band *sband;
3053
3054         sband = local->hw.wiphy->bands[cbss->channel->band];
3055
3056         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3057
3058         if (sband->ht_cap.ht_supported) {
3059                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3060                                               cbss->information_elements,
3061                                               cbss->len_information_elements);
3062                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3063                         ht_oper = (void *)(ht_oper_ie + 2);
3064         }
3065
3066         if (ht_oper) {
3067                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3068                                                           cbss->channel->band);
3069                 /* check that channel matches the right operating channel */
3070                 if (cbss->channel->center_freq != ht_cfreq) {
3071                         /*
3072                          * It's possible that some APs are confused here;
3073                          * Netgear WNDR3700 sometimes reports 4 higher than
3074                          * the actual channel in association responses, but
3075                          * since we look at probe response/beacon data here
3076                          * it should be OK.
3077                          */
3078                         sdata_info(sdata,
3079                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3080                                    cbss->channel->center_freq,
3081                                    ht_cfreq, ht_oper->primary_chan,
3082                                    cbss->channel->band);
3083                         ht_oper = NULL;
3084                 }
3085         }
3086
3087         if (ht_oper) {
3088                 channel_type = NL80211_CHAN_HT20;
3089
3090                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3091                         switch (ht_oper->ht_param &
3092                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3093                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3094                                 channel_type = NL80211_CHAN_HT40PLUS;
3095                                 break;
3096                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3097                                 channel_type = NL80211_CHAN_HT40MINUS;
3098                                 break;
3099                         }
3100                 }
3101         }
3102
3103         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3104                 /* can only fail due to HT40+/- mismatch */
3105                 channel_type = NL80211_CHAN_HT20;
3106                 sdata_info(sdata,
3107                            "disabling 40 MHz due to multi-vif mismatch\n");
3108                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3109                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3110                                                     channel_type));
3111         }
3112
3113         local->oper_channel = cbss->channel;
3114         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3115
3116         return 0;
3117 }
3118
3119 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3120                                      struct cfg80211_bss *cbss, bool assoc)
3121 {
3122         struct ieee80211_local *local = sdata->local;
3123         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3124         struct ieee80211_bss *bss = (void *)cbss->priv;
3125         struct sta_info *new_sta = NULL;
3126         bool have_sta = false;
3127         int err;
3128
3129         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3130                 return -EINVAL;
3131
3132         if (assoc) {
3133                 rcu_read_lock();
3134                 have_sta = sta_info_get(sdata, cbss->bssid);
3135                 rcu_read_unlock();
3136         }
3137
3138         if (!have_sta) {
3139                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3140                 if (!new_sta)
3141                         return -ENOMEM;
3142         }
3143
3144         mutex_lock(&local->mtx);
3145         ieee80211_recalc_idle(sdata->local);
3146         mutex_unlock(&local->mtx);
3147
3148         if (new_sta) {
3149                 u32 rates = 0, basic_rates = 0;
3150                 bool have_higher_than_11mbit;
3151                 int min_rate = INT_MAX, min_rate_index = -1;
3152                 struct ieee80211_supported_band *sband;
3153
3154                 sband = local->hw.wiphy->bands[cbss->channel->band];
3155
3156                 err = ieee80211_prep_channel(sdata, cbss);
3157                 if (err) {
3158                         sta_info_free(local, new_sta);
3159                         return err;
3160                 }
3161
3162                 ieee80211_get_rates(sband, bss->supp_rates,
3163                                     bss->supp_rates_len,
3164                                     &rates, &basic_rates,
3165                                     &have_higher_than_11mbit,
3166                                     &min_rate, &min_rate_index);
3167
3168                 /*
3169                  * This used to be a workaround for basic rates missing
3170                  * in the association response frame. Now that we no
3171                  * longer use the basic rates from there, it probably
3172                  * doesn't happen any more, but keep the workaround so
3173                  * in case some *other* APs are buggy in different ways
3174                  * we can connect -- with a warning.
3175                  */
3176                 if (!basic_rates && min_rate_index >= 0) {
3177                         sdata_info(sdata,
3178                                    "No basic rates, using min rate instead\n");
3179                         basic_rates = BIT(min_rate_index);
3180                 }
3181
3182                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3183                 sdata->vif.bss_conf.basic_rates = basic_rates;
3184
3185                 /* cf. IEEE 802.11 9.2.12 */
3186                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3187                     have_higher_than_11mbit)
3188                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3189                 else
3190                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3191
3192                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3193
3194                 /* set timing information */
3195                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3196                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3197                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3198
3199                 /* tell driver about BSSID, basic rates and timing */
3200                 ieee80211_bss_info_change_notify(sdata,
3201                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3202                         BSS_CHANGED_BEACON_INT);
3203
3204                 if (assoc)
3205                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3206
3207                 err = sta_info_insert(new_sta);
3208                 new_sta = NULL;
3209                 if (err) {
3210                         sdata_info(sdata,
3211                                    "failed to insert STA entry for the AP (error %d)\n",
3212                                    err);
3213                         return err;
3214                 }
3215         } else
3216                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3217
3218         return 0;
3219 }
3220
3221 /* config hooks */
3222 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3223                        struct cfg80211_auth_request *req)
3224 {
3225         struct ieee80211_local *local = sdata->local;
3226         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3227         struct ieee80211_mgd_auth_data *auth_data;
3228         u16 auth_alg;
3229         int err;
3230
3231         /* prepare auth data structure */
3232
3233         switch (req->auth_type) {
3234         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3235                 auth_alg = WLAN_AUTH_OPEN;
3236                 break;
3237         case NL80211_AUTHTYPE_SHARED_KEY:
3238                 if (IS_ERR(local->wep_tx_tfm))
3239                         return -EOPNOTSUPP;
3240                 auth_alg = WLAN_AUTH_SHARED_KEY;
3241                 break;
3242         case NL80211_AUTHTYPE_FT:
3243                 auth_alg = WLAN_AUTH_FT;
3244                 break;
3245         case NL80211_AUTHTYPE_NETWORK_EAP:
3246                 auth_alg = WLAN_AUTH_LEAP;
3247                 break;
3248         default:
3249                 return -EOPNOTSUPP;
3250         }
3251
3252         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3253         if (!auth_data)
3254                 return -ENOMEM;
3255
3256         auth_data->bss = req->bss;
3257
3258         if (req->ie && req->ie_len) {
3259                 memcpy(auth_data->ie, req->ie, req->ie_len);
3260                 auth_data->ie_len = req->ie_len;
3261         }
3262
3263         if (req->key && req->key_len) {
3264                 auth_data->key_len = req->key_len;
3265                 auth_data->key_idx = req->key_idx;
3266                 memcpy(auth_data->key, req->key, req->key_len);
3267         }
3268
3269         auth_data->algorithm = auth_alg;
3270
3271         /* try to authenticate/probe */
3272
3273         mutex_lock(&ifmgd->mtx);
3274
3275         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3276             ifmgd->assoc_data) {
3277                 err = -EBUSY;
3278                 goto err_free;
3279         }
3280
3281         if (ifmgd->auth_data)
3282                 ieee80211_destroy_auth_data(sdata, false);
3283
3284         /* prep auth_data so we don't go into idle on disassoc */
3285         ifmgd->auth_data = auth_data;
3286
3287         if (ifmgd->associated)
3288                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3289
3290         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3291
3292         err = ieee80211_prep_connection(sdata, req->bss, false);
3293         if (err)
3294                 goto err_clear;
3295
3296         err = ieee80211_probe_auth(sdata);
3297         if (err) {
3298                 sta_info_destroy_addr(sdata, req->bss->bssid);
3299                 goto err_clear;
3300         }
3301
3302         /* hold our own reference */
3303         cfg80211_ref_bss(auth_data->bss);
3304         err = 0;
3305         goto out_unlock;
3306
3307  err_clear:
3308         ifmgd->auth_data = NULL;
3309  err_free:
3310         kfree(auth_data);
3311  out_unlock:
3312         mutex_unlock(&ifmgd->mtx);
3313
3314         return err;
3315 }
3316
3317 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3318                         struct cfg80211_assoc_request *req)
3319 {
3320         struct ieee80211_local *local = sdata->local;
3321         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3322         struct ieee80211_bss *bss = (void *)req->bss->priv;
3323         struct ieee80211_mgd_assoc_data *assoc_data;
3324         struct ieee80211_supported_band *sband;
3325         const u8 *ssidie, *ht_ie;
3326         int i, err;
3327
3328         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3329         if (!ssidie)
3330                 return -EINVAL;
3331
3332         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3333         if (!assoc_data)
3334                 return -ENOMEM;
3335
3336         mutex_lock(&ifmgd->mtx);
3337
3338         if (ifmgd->associated)
3339                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3340
3341         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3342                 err = -EBUSY;
3343                 goto err_free;
3344         }
3345
3346         if (ifmgd->assoc_data) {
3347                 err = -EBUSY;
3348                 goto err_free;
3349         }
3350
3351         if (ifmgd->auth_data) {
3352                 bool match;
3353
3354                 /* keep sta info, bssid if matching */
3355                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3356                 ieee80211_destroy_auth_data(sdata, match);
3357         }
3358
3359         /* prepare assoc data */
3360
3361         /*
3362          * keep only the 40 MHz disable bit set as it might have
3363          * been set during authentication already, all other bits
3364          * should be reset for a new connection
3365          */
3366         ifmgd->flags &= IEEE80211_STA_DISABLE_40MHZ;
3367
3368         ifmgd->beacon_crc_valid = false;
3369
3370         /*
3371          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3372          * We still associate in non-HT mode (11a/b/g) if any one of these
3373          * ciphers is configured as pairwise.
3374          * We can set this to true for non-11n hardware, that'll be checked
3375          * separately along with the peer capabilities.
3376          */
3377         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3378                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3379                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3380                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3381                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3382                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3383                         netdev_info(sdata->dev,
3384                                     "disabling HT/VHT due to WEP/TKIP use\n");
3385                 }
3386         }
3387
3388         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3389                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3390                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3391         }
3392
3393         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3394         sband = local->hw.wiphy->bands[req->bss->channel->band];
3395         if (!sband->ht_cap.ht_supported ||
3396             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3397                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3398                 if (!bss->wmm_used)
3399                         netdev_info(sdata->dev,
3400                                     "disabling HT as WMM/QoS is not supported by the AP\n");
3401         }
3402
3403         /* disable VHT if we don't support it or the AP doesn't use WMM */
3404         if (!sband->vht_cap.vht_supported ||
3405             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3406                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3407                 if (!bss->wmm_used)
3408                         netdev_info(sdata->dev,
3409                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
3410         }
3411
3412         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3413         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3414                sizeof(ifmgd->ht_capa_mask));
3415
3416         if (req->ie && req->ie_len) {
3417                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3418                 assoc_data->ie_len = req->ie_len;
3419         }
3420
3421         assoc_data->bss = req->bss;
3422
3423         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3424                 if (ifmgd->powersave)
3425                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3426                 else
3427                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3428         } else
3429                 ifmgd->ap_smps = ifmgd->req_smps;
3430
3431         assoc_data->capability = req->bss->capability;
3432         assoc_data->wmm = bss->wmm_used &&
3433                           (local->hw.queues >= IEEE80211_NUM_ACS);
3434         assoc_data->supp_rates = bss->supp_rates;
3435         assoc_data->supp_rates_len = bss->supp_rates_len;
3436
3437         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3438         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3439                 assoc_data->ap_ht_param =
3440                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3441         else
3442                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3443
3444         if (bss->wmm_used && bss->uapsd_supported &&
3445             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3446                 assoc_data->uapsd = true;
3447                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3448         } else {
3449                 assoc_data->uapsd = false;
3450                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3451         }
3452
3453         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3454         assoc_data->ssid_len = ssidie[1];
3455
3456         if (req->prev_bssid)
3457                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3458
3459         if (req->use_mfp) {
3460                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3461                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3462         } else {
3463                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3464                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3465         }
3466
3467         if (req->crypto.control_port)
3468                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3469         else
3470                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3471
3472         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3473         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3474
3475         /* kick off associate process */
3476
3477         ifmgd->assoc_data = assoc_data;
3478
3479         err = ieee80211_prep_connection(sdata, req->bss, true);
3480         if (err)
3481                 goto err_clear;
3482
3483         if (!bss->dtim_period &&
3484             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3485                 /*
3486                  * Wait up to one beacon interval ...
3487                  * should this be more if we miss one?
3488                  */
3489                 sdata_info(sdata, "waiting for beacon from %pM\n",
3490                            ifmgd->bssid);
3491                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3492         } else {
3493                 assoc_data->have_beacon = true;
3494                 assoc_data->sent_assoc = false;
3495                 assoc_data->timeout = jiffies;
3496         }
3497         run_again(ifmgd, assoc_data->timeout);
3498
3499         if (bss->corrupt_data) {
3500                 char *corrupt_type = "data";
3501                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3502                         if (bss->corrupt_data &
3503                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3504                                 corrupt_type = "beacon and probe response";
3505                         else
3506                                 corrupt_type = "beacon";
3507                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3508                         corrupt_type = "probe response";
3509                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3510                            corrupt_type);
3511         }
3512
3513         err = 0;
3514         goto out;
3515  err_clear:
3516         ifmgd->assoc_data = NULL;
3517  err_free:
3518         kfree(assoc_data);
3519  out:
3520         mutex_unlock(&ifmgd->mtx);
3521
3522         return err;
3523 }
3524
3525 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3526                          struct cfg80211_deauth_request *req)
3527 {
3528         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3529         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3530
3531         mutex_lock(&ifmgd->mtx);
3532
3533         if (ifmgd->auth_data) {
3534                 ieee80211_destroy_auth_data(sdata, false);
3535                 mutex_unlock(&ifmgd->mtx);
3536                 return 0;
3537         }
3538
3539         sdata_info(sdata,
3540                    "deauthenticating from %pM by local choice (reason=%d)\n",
3541                    req->bssid, req->reason_code);
3542
3543         if (ifmgd->associated &&
3544             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
3545                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3546                                        req->reason_code, true, frame_buf);
3547         } else {
3548                 drv_mgd_prepare_tx(sdata->local, sdata);
3549                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3550                                                IEEE80211_STYPE_DEAUTH,
3551                                                req->reason_code, true,
3552                                                frame_buf);
3553         }
3554
3555         mutex_unlock(&ifmgd->mtx);
3556
3557         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3558
3559         mutex_lock(&sdata->local->mtx);
3560         ieee80211_recalc_idle(sdata->local);
3561         mutex_unlock(&sdata->local->mtx);
3562
3563         return 0;
3564 }
3565
3566 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3567                            struct cfg80211_disassoc_request *req)
3568 {
3569         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3570         u8 bssid[ETH_ALEN];
3571         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3572
3573         mutex_lock(&ifmgd->mtx);
3574
3575         /*
3576          * cfg80211 should catch this ... but it's racy since
3577          * we can receive a disassoc frame, process it, hand it
3578          * to cfg80211 while that's in a locked section already
3579          * trying to tell us that the user wants to disconnect.
3580          */
3581         if (ifmgd->associated != req->bss) {
3582                 mutex_unlock(&ifmgd->mtx);
3583                 return -ENOLINK;
3584         }
3585
3586         sdata_info(sdata,
3587                    "disassociating from %pM by local choice (reason=%d)\n",
3588                    req->bss->bssid, req->reason_code);
3589
3590         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3591         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3592                                req->reason_code, !req->local_state_change,
3593                                frame_buf);
3594         mutex_unlock(&ifmgd->mtx);
3595
3596         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3597
3598         mutex_lock(&sdata->local->mtx);
3599         ieee80211_recalc_idle(sdata->local);
3600         mutex_unlock(&sdata->local->mtx);
3601
3602         return 0;
3603 }
3604
3605 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3606 {
3607         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3608
3609         mutex_lock(&ifmgd->mtx);
3610         if (ifmgd->assoc_data)
3611                 ieee80211_destroy_assoc_data(sdata, false);
3612         if (ifmgd->auth_data)
3613                 ieee80211_destroy_auth_data(sdata, false);
3614         del_timer_sync(&ifmgd->timer);
3615         mutex_unlock(&ifmgd->mtx);
3616 }
3617
3618 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3619                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3620                                gfp_t gfp)
3621 {
3622         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3623
3624         trace_api_cqm_rssi_notify(sdata, rssi_event);
3625
3626         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3627 }
3628 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);