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         /* XXX: wait for a beacon first? */
 716         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 717                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 718  out:
 719         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 720         mutex_unlock(&ifmgd->mtx);
 721 }
 722
 723 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 724 {
 725         struct ieee80211_sub_if_data *sdata;
 726         struct ieee80211_if_managed *ifmgd;
 727
 728         sdata = vif_to_sdata(vif);
 729         ifmgd = &sdata->u.mgd;
 730
 731         trace_api_chswitch_done(sdata, success);
 732         if (!success) {
 733                 sdata_info(sdata,
 734                            "driver channel switch failed, disconnecting\n");
 735                 ieee80211_queue_work(&sdata->local->hw,
 736                                      &ifmgd->csa_connection_drop_work);
 737         } else {
 738                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 739         }
 740 }
 741 EXPORT_SYMBOL(ieee80211_chswitch_done);
 742
 743 static void ieee80211_chswitch_timer(unsigned long data)
 744 {
 745         struct ieee80211_sub_if_data *sdata =
 746                 (struct ieee80211_sub_if_data *) data;
 747         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 748
 749         if (sdata->local->quiescing) {
 750                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 751                 return;
 752         }
 753
 754         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 755 }
 756
 757 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 758                                       struct ieee80211_channel_sw_ie *sw_elem,
 759                                       struct ieee80211_bss *bss,
 760                                       u64 timestamp)
 761 {
 762         struct cfg80211_bss *cbss =
 763                 container_of((void *)bss, struct cfg80211_bss, priv);
 764         struct ieee80211_channel *new_ch;
 765         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 766         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 767                                                       cbss->channel->band);
 768
 769         ASSERT_MGD_MTX(ifmgd);
 770
 771         if (!ifmgd->associated)
 772                 return;
 773
 774         if (sdata->local->scanning)
 775                 return;
 776
 777         /* Disregard subsequent beacons if we are already running a timer
 778            processing a CSA */
 779
 780         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 781                 return;
 782
 783         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 784         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
 785                 sdata_info(sdata,
 786                            "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
 787                            ifmgd->associated->bssid, new_freq);
 788                 ieee80211_queue_work(&sdata->local->hw,
 789                                      &ifmgd->csa_connection_drop_work);
 790                 return;
 791         }
 792
 793         sdata->local->csa_channel = new_ch;
 794
 795         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 796
 797         if (sw_elem->mode)
 798                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 799                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 800
 801         if (sdata->local->ops->channel_switch) {
 802                 /* use driver's channel switch callback */
 803                 struct ieee80211_channel_switch ch_switch = {
 804                         .timestamp = timestamp,
 805                         .block_tx = sw_elem->mode,
 806                         .channel = new_ch,
 807                         .count = sw_elem->count,
 808                 };
 809
 810                 drv_channel_switch(sdata->local, &ch_switch);
 811                 return;
 812         }
 813
 814         /* channel switch handled in software */
 815         if (sw_elem->count <= 1)
 816                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 817         else
 818                 mod_timer(&ifmgd->chswitch_timer,
 819                           TU_TO_EXP_TIME(sw_elem->count *
 820                                          cbss->beacon_interval));
 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         sdata->u.mgd.timers_running = 0;
1475 }
1476
1477 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1478                              struct ieee80211_hdr *hdr)
1479 {
1480         /*
1481          * We can postpone the mgd.timer whenever receiving unicast frames
1482          * from AP because we know that the connection is working both ways
1483          * at that time. But multicast frames (and hence also beacons) must
1484          * be ignored here, because we need to trigger the timer during
1485          * data idle periods for sending the periodic probe request to the
1486          * AP we're connected to.
1487          */
1488         if (is_multicast_ether_addr(hdr->addr1))
1489                 return;
1490
1491         ieee80211_sta_reset_conn_monitor(sdata);
1492 }
1493
1494 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1495 {
1496         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1497         struct ieee80211_local *local = sdata->local;
1498
1499         mutex_lock(&local->mtx);
1500         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1501                               IEEE80211_STA_CONNECTION_POLL))) {
1502                 mutex_unlock(&local->mtx);
1503                 return;
1504         }
1505
1506         __ieee80211_stop_poll(sdata);
1507
1508         mutex_lock(&local->iflist_mtx);
1509         ieee80211_recalc_ps(local, -1);
1510         mutex_unlock(&local->iflist_mtx);
1511
1512         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1513                 goto out;
1514
1515         /*
1516          * We've received a probe response, but are not sure whether
1517          * we have or will be receiving any beacons or data, so let's
1518          * schedule the timers again, just in case.
1519          */
1520         ieee80211_sta_reset_beacon_monitor(sdata);
1521
1522         mod_timer(&ifmgd->conn_mon_timer,
1523                   round_jiffies_up(jiffies +
1524                                    IEEE80211_CONNECTION_IDLE_TIME));
1525 out:
1526         mutex_unlock(&local->mtx);
1527 }
1528
1529 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1530                              struct ieee80211_hdr *hdr, bool ack)
1531 {
1532         if (!ieee80211_is_data(hdr->frame_control))
1533             return;
1534
1535         if (ack)
1536                 ieee80211_sta_reset_conn_monitor(sdata);
1537
1538         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1539             sdata->u.mgd.probe_send_count > 0) {
1540                 if (ack)
1541                         sdata->u.mgd.probe_send_count = 0;
1542                 else
1543                         sdata->u.mgd.nullfunc_failed = true;
1544                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1545         }
1546 }
1547
1548 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1549 {
1550         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1551         const u8 *ssid;
1552         u8 *dst = ifmgd->associated->bssid;
1553         u8 unicast_limit = max(1, max_probe_tries - 3);
1554
1555         /*
1556          * Try sending broadcast probe requests for the last three
1557          * probe requests after the first ones failed since some
1558          * buggy APs only support broadcast probe requests.
1559          */
1560         if (ifmgd->probe_send_count >= unicast_limit)
1561                 dst = NULL;
1562
1563         /*
1564          * When the hardware reports an accurate Tx ACK status, it's
1565          * better to send a nullfunc frame instead of a probe request,
1566          * as it will kick us off the AP quickly if we aren't associated
1567          * anymore. The timeout will be reset if the frame is ACKed by
1568          * the AP.
1569          */
1570         ifmgd->probe_send_count++;
1571
1572         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1573                 ifmgd->nullfunc_failed = false;
1574                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1575         } else {
1576                 int ssid_len;
1577
1578                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1579                 if (WARN_ON_ONCE(ssid == NULL))
1580                         ssid_len = 0;
1581                 else
1582                         ssid_len = ssid[1];
1583
1584                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1585                                          0, (u32) -1, true, false,
1586                                          ifmgd->associated->channel);
1587         }
1588
1589         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1590         run_again(ifmgd, ifmgd->probe_timeout);
1591         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1592                 drv_flush(sdata->local, false);
1593 }
1594
1595 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1596                                    bool beacon)
1597 {
1598         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1599         bool already = false;
1600
1601         if (!ieee80211_sdata_running(sdata))
1602                 return;
1603
1604         mutex_lock(&ifmgd->mtx);
1605
1606         if (!ifmgd->associated)
1607                 goto out;
1608
1609         mutex_lock(&sdata->local->mtx);
1610
1611         if (sdata->local->tmp_channel || sdata->local->scanning) {
1612                 mutex_unlock(&sdata->local->mtx);
1613                 goto out;
1614         }
1615
1616         if (beacon)
1617                 mlme_dbg_ratelimited(sdata,
1618                                      "detected beacon loss from AP - sending probe request\n");
1619
1620         ieee80211_cqm_rssi_notify(&sdata->vif,
1621                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1622
1623         /*
1624          * The driver/our work has already reported this event or the
1625          * connection monitoring has kicked in and we have already sent
1626          * a probe request. Or maybe the AP died and the driver keeps
1627          * reporting until we disassociate...
1628          *
1629          * In either case we have to ignore the current call to this
1630          * function (except for setting the correct probe reason bit)
1631          * because otherwise we would reset the timer every time and
1632          * never check whether we received a probe response!
1633          */
1634         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1635                             IEEE80211_STA_CONNECTION_POLL))
1636                 already = true;
1637
1638         if (beacon)
1639                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1640         else
1641                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1642
1643         mutex_unlock(&sdata->local->mtx);
1644
1645         if (already)
1646                 goto out;
1647
1648         mutex_lock(&sdata->local->iflist_mtx);
1649         ieee80211_recalc_ps(sdata->local, -1);
1650         mutex_unlock(&sdata->local->iflist_mtx);
1651
1652         ifmgd->probe_send_count = 0;
1653         ieee80211_mgd_probe_ap_send(sdata);
1654  out:
1655         mutex_unlock(&ifmgd->mtx);
1656 }
1657
1658 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1659                                           struct ieee80211_vif *vif)
1660 {
1661         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1662         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1663         struct cfg80211_bss *cbss;
1664         struct sk_buff *skb;
1665         const u8 *ssid;
1666         int ssid_len;
1667
1668         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1669                 return NULL;
1670
1671         ASSERT_MGD_MTX(ifmgd);
1672
1673         if (ifmgd->associated)
1674                 cbss = ifmgd->associated;
1675         else if (ifmgd->auth_data)
1676                 cbss = ifmgd->auth_data->bss;
1677         else if (ifmgd->assoc_data)
1678                 cbss = ifmgd->assoc_data->bss;
1679         else
1680                 return NULL;
1681
1682         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1683         if (WARN_ON_ONCE(ssid == NULL))
1684                 ssid_len = 0;
1685         else
1686                 ssid_len = ssid[1];
1687
1688         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1689                                         (u32) -1,
1690                                         sdata->local->oper_channel,
1691                                         ssid + 2, ssid_len,
1692                                         NULL, 0, true);
1693
1694         return skb;
1695 }
1696 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1697
1698 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata,
1699                                    bool transmit_frame)
1700 {
1701         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1702         struct ieee80211_local *local = sdata->local;
1703         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1704
1705         mutex_lock(&ifmgd->mtx);
1706         if (!ifmgd->associated) {
1707                 mutex_unlock(&ifmgd->mtx);
1708                 return;
1709         }
1710
1711         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1712                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1713                                transmit_frame, frame_buf);
1714         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
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 static 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                 sdata_info(sdata, "Connection to AP %pM lost\n",
1746                            ifmgd->bssid);
1747                 __ieee80211_disconnect(sdata, false);
1748         } else {
1749                 ieee80211_mgd_probe_ap(sdata, true);
1750         }
1751 }
1752
1753 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
1754 {
1755         struct ieee80211_sub_if_data *sdata =
1756                 container_of(work, struct ieee80211_sub_if_data,
1757                              u.mgd.csa_connection_drop_work);
1758
1759         ieee80211_wake_queues_by_reason(&sdata->local->hw,
1760                                         IEEE80211_QUEUE_STOP_REASON_CSA);
1761         __ieee80211_disconnect(sdata, true);
1762 }
1763
1764 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1765 {
1766         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1767         struct ieee80211_hw *hw = &sdata->local->hw;
1768
1769         trace_api_beacon_loss(sdata);
1770
1771         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1772         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1773 }
1774 EXPORT_SYMBOL(ieee80211_beacon_loss);
1775
1776 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1777 {
1778         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1779         struct ieee80211_hw *hw = &sdata->local->hw;
1780
1781         trace_api_connection_loss(sdata);
1782
1783         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1784         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1785 }
1786 EXPORT_SYMBOL(ieee80211_connection_loss);
1787
1788
1789 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1790                                         bool assoc)
1791 {
1792         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1793
1794         lockdep_assert_held(&sdata->u.mgd.mtx);
1795
1796         if (!assoc) {
1797                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1798
1799                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1800                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1801         }
1802
1803         cfg80211_put_bss(auth_data->bss);
1804         kfree(auth_data);
1805         sdata->u.mgd.auth_data = NULL;
1806 }
1807
1808 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1809                                      struct ieee80211_mgmt *mgmt, size_t len)
1810 {
1811         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1812         u8 *pos;
1813         struct ieee802_11_elems elems;
1814
1815         pos = mgmt->u.auth.variable;
1816         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1817         if (!elems.challenge)
1818                 return;
1819         auth_data->expected_transaction = 4;
1820         drv_mgd_prepare_tx(sdata->local, sdata);
1821         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1822                             elems.challenge - 2, elems.challenge_len + 2,
1823                             auth_data->bss->bssid, auth_data->bss->bssid,
1824                             auth_data->key, auth_data->key_len,
1825                             auth_data->key_idx);
1826 }
1827
1828 static enum rx_mgmt_action __must_check
1829 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1830                        struct ieee80211_mgmt *mgmt, size_t len)
1831 {
1832         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1833         u8 bssid[ETH_ALEN];
1834         u16 auth_alg, auth_transaction, status_code;
1835         struct sta_info *sta;
1836
1837         lockdep_assert_held(&ifmgd->mtx);
1838
1839         if (len < 24 + 6)
1840                 return RX_MGMT_NONE;
1841
1842         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1843                 return RX_MGMT_NONE;
1844
1845         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1846
1847         if (!ether_addr_equal(bssid, mgmt->bssid))
1848                 return RX_MGMT_NONE;
1849
1850         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1851         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1852         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1853
1854         if (auth_alg != ifmgd->auth_data->algorithm ||
1855             auth_transaction != ifmgd->auth_data->expected_transaction)
1856                 return RX_MGMT_NONE;
1857
1858         if (status_code != WLAN_STATUS_SUCCESS) {
1859                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1860                            mgmt->sa, status_code);
1861                 ieee80211_destroy_auth_data(sdata, false);
1862                 return RX_MGMT_CFG80211_RX_AUTH;
1863         }
1864
1865         switch (ifmgd->auth_data->algorithm) {
1866         case WLAN_AUTH_OPEN:
1867         case WLAN_AUTH_LEAP:
1868         case WLAN_AUTH_FT:
1869                 break;
1870         case WLAN_AUTH_SHARED_KEY:
1871                 if (ifmgd->auth_data->expected_transaction != 4) {
1872                         ieee80211_auth_challenge(sdata, mgmt, len);
1873                         /* need another frame */
1874                         return RX_MGMT_NONE;
1875                 }
1876                 break;
1877         default:
1878                 WARN_ONCE(1, "invalid auth alg %d",
1879                           ifmgd->auth_data->algorithm);
1880                 return RX_MGMT_NONE;
1881         }
1882
1883         sdata_info(sdata, "authenticated\n");
1884         ifmgd->auth_data->done = true;
1885         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1886         run_again(ifmgd, ifmgd->auth_data->timeout);
1887
1888         /* move station state to auth */
1889         mutex_lock(&sdata->local->sta_mtx);
1890         sta = sta_info_get(sdata, bssid);
1891         if (!sta) {
1892                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1893                 goto out_err;
1894         }
1895         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1896                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1897                 goto out_err;
1898         }
1899         mutex_unlock(&sdata->local->sta_mtx);
1900
1901         return RX_MGMT_CFG80211_RX_AUTH;
1902  out_err:
1903         mutex_unlock(&sdata->local->sta_mtx);
1904         /* ignore frame -- wait for timeout */
1905         return RX_MGMT_NONE;
1906 }
1907
1908
1909 static enum rx_mgmt_action __must_check
1910 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1911                          struct ieee80211_mgmt *mgmt, size_t len)
1912 {
1913         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1914         const u8 *bssid = NULL;
1915         u16 reason_code;
1916
1917         lockdep_assert_held(&ifmgd->mtx);
1918
1919         if (len < 24 + 2)
1920                 return RX_MGMT_NONE;
1921
1922         if (!ifmgd->associated ||
1923             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1924                 return RX_MGMT_NONE;
1925
1926         bssid = ifmgd->associated->bssid;
1927
1928         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1929
1930         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1931                    bssid, reason_code);
1932
1933         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1934
1935         mutex_lock(&sdata->local->mtx);
1936         ieee80211_recalc_idle(sdata->local);
1937         mutex_unlock(&sdata->local->mtx);
1938
1939         return RX_MGMT_CFG80211_DEAUTH;
1940 }
1941
1942
1943 static enum rx_mgmt_action __must_check
1944 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1945                            struct ieee80211_mgmt *mgmt, size_t len)
1946 {
1947         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1948         u16 reason_code;
1949
1950         lockdep_assert_held(&ifmgd->mtx);
1951
1952         if (len < 24 + 2)
1953                 return RX_MGMT_NONE;
1954
1955         if (!ifmgd->associated ||
1956             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1957                 return RX_MGMT_NONE;
1958
1959         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1960
1961         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1962                    mgmt->sa, reason_code);
1963
1964         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1965
1966         mutex_lock(&sdata->local->mtx);
1967         ieee80211_recalc_idle(sdata->local);
1968         mutex_unlock(&sdata->local->mtx);
1969
1970         return RX_MGMT_CFG80211_DISASSOC;
1971 }
1972
1973 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1974                                 u8 *supp_rates, unsigned int supp_rates_len,
1975                                 u32 *rates, u32 *basic_rates,
1976                                 bool *have_higher_than_11mbit,
1977                                 int *min_rate, int *min_rate_index)
1978 {
1979         int i, j;
1980
1981         for (i = 0; i < supp_rates_len; i++) {
1982                 int rate = (supp_rates[i] & 0x7f) * 5;
1983                 bool is_basic = !!(supp_rates[i] & 0x80);
1984
1985                 if (rate > 110)
1986                         *have_higher_than_11mbit = true;
1987
1988                 /*
1989                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1990                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1991                  *
1992                  * Note: Even through the membership selector and the basic
1993                  *       rate flag share the same bit, they are not exactly
1994                  *       the same.
1995                  */
1996                 if (!!(supp_rates[i] & 0x80) &&
1997                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1998                         continue;
1999
2000                 for (j = 0; j < sband->n_bitrates; j++) {
2001                         if (sband->bitrates[j].bitrate == rate) {
2002                                 *rates |= BIT(j);
2003                                 if (is_basic)
2004                                         *basic_rates |= BIT(j);
2005                                 if (rate < *min_rate) {
2006                                         *min_rate = rate;
2007                                         *min_rate_index = j;
2008                                 }
2009                                 break;
2010                         }
2011                 }
2012         }
2013 }
2014
2015 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2016                                          bool assoc)
2017 {
2018         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2019
2020         lockdep_assert_held(&sdata->u.mgd.mtx);
2021
2022         if (!assoc) {
2023                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2024
2025                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2026                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2027         }
2028
2029         kfree(assoc_data);
2030         sdata->u.mgd.assoc_data = NULL;
2031 }
2032
2033 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2034                                     struct cfg80211_bss *cbss,
2035                                     struct ieee80211_mgmt *mgmt, size_t len)
2036 {
2037         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2038         struct ieee80211_local *local = sdata->local;
2039         struct ieee80211_supported_band *sband;
2040         struct sta_info *sta;
2041         u8 *pos;
2042         u16 capab_info, aid;
2043         struct ieee802_11_elems elems;
2044         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2045         u32 changed = 0;
2046         int err;
2047
2048         /* AssocResp and ReassocResp have identical structure */
2049
2050         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2051         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2052
2053         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2054                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2055                            aid);
2056         aid &= ~(BIT(15) | BIT(14));
2057
2058         ifmgd->broken_ap = false;
2059
2060         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2061                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2062                            aid);
2063                 aid = 0;
2064                 ifmgd->broken_ap = true;
2065         }
2066
2067         pos = mgmt->u.assoc_resp.variable;
2068         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2069
2070         if (!elems.supp_rates) {
2071                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2072                 return false;
2073         }
2074
2075         ifmgd->aid = aid;
2076
2077         mutex_lock(&sdata->local->sta_mtx);
2078         /*
2079          * station info was already allocated and inserted before
2080          * the association and should be available to us
2081          */
2082         sta = sta_info_get(sdata, cbss->bssid);
2083         if (WARN_ON(!sta)) {
2084                 mutex_unlock(&sdata->local->sta_mtx);
2085                 return false;
2086         }
2087
2088         sband = local->hw.wiphy->bands[local->oper_channel->band];
2089
2090         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2091                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2092                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2093
2094         sta->supports_40mhz =
2095                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2096
2097         rate_control_rate_init(sta);
2098
2099         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2100                 set_sta_flag(sta, WLAN_STA_MFP);
2101
2102         if (elems.wmm_param)
2103                 set_sta_flag(sta, WLAN_STA_WME);
2104
2105         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2106         if (!err)
2107                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2108         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2109                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2110         if (err) {
2111                 sdata_info(sdata,
2112                            "failed to move station %pM to desired state\n",
2113                            sta->sta.addr);
2114                 WARN_ON(__sta_info_destroy(sta));
2115                 mutex_unlock(&sdata->local->sta_mtx);
2116                 return false;
2117         }
2118
2119         mutex_unlock(&sdata->local->sta_mtx);
2120
2121         /*
2122          * Always handle WMM once after association regardless
2123          * of the first value the AP uses. Setting -1 here has
2124          * that effect because the AP values is an unsigned
2125          * 4-bit value.
2126          */
2127         ifmgd->wmm_last_param_set = -1;
2128
2129         if (elems.wmm_param)
2130                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2131                                          elems.wmm_param_len);
2132         else
2133                 ieee80211_set_wmm_default(sdata, false);
2134         changed |= BSS_CHANGED_QOS;
2135
2136         if (elems.ht_operation && elems.wmm_param &&
2137             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2138                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2139                                                   cbss->bssid, false);
2140
2141         /* set AID and assoc capability,
2142          * ieee80211_set_associated() will tell the driver */
2143         bss_conf->aid = aid;
2144         bss_conf->assoc_capability = capab_info;
2145         ieee80211_set_associated(sdata, cbss, changed);
2146
2147         /*
2148          * If we're using 4-addr mode, let the AP know that we're
2149          * doing so, so that it can create the STA VLAN on its side
2150          */
2151         if (ifmgd->use_4addr)
2152                 ieee80211_send_4addr_nullfunc(local, sdata);
2153
2154         /*
2155          * Start timer to probe the connection to the AP now.
2156          * Also start the timer that will detect beacon loss.
2157          */
2158         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2159         ieee80211_sta_reset_beacon_monitor(sdata);
2160
2161         return true;
2162 }
2163
2164 static enum rx_mgmt_action __must_check
2165 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2166                              struct ieee80211_mgmt *mgmt, size_t len,
2167                              struct cfg80211_bss **bss)
2168 {
2169         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2170         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2171         u16 capab_info, status_code, aid;
2172         struct ieee802_11_elems elems;
2173         u8 *pos;
2174         bool reassoc;
2175
2176         lockdep_assert_held(&ifmgd->mtx);
2177
2178         if (!assoc_data)
2179                 return RX_MGMT_NONE;
2180         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2181                 return RX_MGMT_NONE;
2182
2183         /*
2184          * AssocResp and ReassocResp have identical structure, so process both
2185          * of them in this function.
2186          */
2187
2188         if (len < 24 + 6)
2189                 return RX_MGMT_NONE;
2190
2191         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2192         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2193         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2194         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2195
2196         sdata_info(sdata,
2197                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2198                    reassoc ? "Rea" : "A", mgmt->sa,
2199                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2200
2201         pos = mgmt->u.assoc_resp.variable;
2202         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2203
2204         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2205             elems.timeout_int && elems.timeout_int_len == 5 &&
2206             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2207                 u32 tu, ms;
2208                 tu = get_unaligned_le32(elems.timeout_int + 1);
2209                 ms = tu * 1024 / 1000;
2210                 sdata_info(sdata,
2211                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2212                            mgmt->sa, tu, ms);
2213                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2214                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2215                         run_again(ifmgd, assoc_data->timeout);
2216                 return RX_MGMT_NONE;
2217         }
2218
2219         *bss = assoc_data->bss;
2220
2221         if (status_code != WLAN_STATUS_SUCCESS) {
2222                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2223                            mgmt->sa, status_code);
2224                 ieee80211_destroy_assoc_data(sdata, false);
2225         } else {
2226                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2227                         /* oops -- internal error -- send timeout for now */
2228                         ieee80211_destroy_assoc_data(sdata, false);
2229                         cfg80211_put_bss(*bss);
2230                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2231                 }
2232                 sdata_info(sdata, "associated\n");
2233
2234                 /*
2235                  * destroy assoc_data afterwards, as otherwise an idle
2236                  * recalc after assoc_data is NULL but before associated
2237                  * is set can cause the interface to go idle
2238                  */
2239                 ieee80211_destroy_assoc_data(sdata, true);
2240         }
2241
2242         return RX_MGMT_CFG80211_RX_ASSOC;
2243 }
2244 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2245                                   struct ieee80211_mgmt *mgmt,
2246                                   size_t len,
2247                                   struct ieee80211_rx_status *rx_status,
2248                                   struct ieee802_11_elems *elems,
2249                                   bool beacon)
2250 {
2251         struct ieee80211_local *local = sdata->local;
2252         int freq;
2253         struct ieee80211_bss *bss;
2254         struct ieee80211_channel *channel;
2255         bool need_ps = false;
2256
2257         if (sdata->u.mgd.associated &&
2258             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2259                 bss = (void *)sdata->u.mgd.associated->priv;
2260                 /* not previously set so we may need to recalc */
2261                 need_ps = !bss->dtim_period;
2262         }
2263
2264         if (elems->ds_params && elems->ds_params_len == 1)
2265                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2266                                                       rx_status->band);
2267         else
2268                 freq = rx_status->freq;
2269
2270         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2271
2272         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2273                 return;
2274
2275         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2276                                         channel, beacon);
2277         if (bss)
2278                 ieee80211_rx_bss_put(local, bss);
2279
2280         if (!sdata->u.mgd.associated)
2281                 return;
2282
2283         if (need_ps) {
2284                 mutex_lock(&local->iflist_mtx);
2285                 ieee80211_recalc_ps(local, -1);
2286                 mutex_unlock(&local->iflist_mtx);
2287         }
2288
2289         if (elems->ch_switch_ie &&
2290             memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2291                 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2292                                                  bss, rx_status->mactime);
2293 }
2294
2295
2296 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2297                                          struct sk_buff *skb)
2298 {
2299         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2300         struct ieee80211_if_managed *ifmgd;
2301         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2302         size_t baselen, len = skb->len;
2303         struct ieee802_11_elems elems;
2304
2305         ifmgd = &sdata->u.mgd;
2306
2307         ASSERT_MGD_MTX(ifmgd);
2308
2309         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2310                 return; /* ignore ProbeResp to foreign address */
2311
2312         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2313         if (baselen > len)
2314                 return;
2315
2316         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2317                                 &elems);
2318
2319         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2320
2321         if (ifmgd->associated &&
2322             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2323                 ieee80211_reset_ap_probe(sdata);
2324
2325         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2326             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2327                 /* got probe response, continue with auth */
2328                 sdata_info(sdata, "direct probe responded\n");
2329                 ifmgd->auth_data->tries = 0;
2330                 ifmgd->auth_data->timeout = jiffies;
2331                 run_again(ifmgd, ifmgd->auth_data->timeout);
2332         }
2333 }
2334
2335 /*
2336  * This is the canonical list of information elements we care about,
2337  * the filter code also gives us all changes to the Microsoft OUI
2338  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2339  *
2340  * We implement beacon filtering in software since that means we can
2341  * avoid processing the frame here and in cfg80211, and userspace
2342  * will not be able to tell whether the hardware supports it or not.
2343  *
2344  * XXX: This list needs to be dynamic -- userspace needs to be able to
2345  *      add items it requires. It also needs to be able to tell us to
2346  *      look out for other vendor IEs.
2347  */
2348 static const u64 care_about_ies =
2349         (1ULL << WLAN_EID_COUNTRY) |
2350         (1ULL << WLAN_EID_ERP_INFO) |
2351         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2352         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2353         (1ULL << WLAN_EID_HT_CAPABILITY) |
2354         (1ULL << WLAN_EID_HT_OPERATION);
2355
2356 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2357                                      struct ieee80211_mgmt *mgmt,
2358                                      size_t len,
2359                                      struct ieee80211_rx_status *rx_status)
2360 {
2361         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2362         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2363         size_t baselen;
2364         struct ieee802_11_elems elems;
2365         struct ieee80211_local *local = sdata->local;
2366         u32 changed = 0;
2367         bool erp_valid, directed_tim = false;
2368         u8 erp_value = 0;
2369         u32 ncrc;
2370         u8 *bssid;
2371
2372         lockdep_assert_held(&ifmgd->mtx);
2373
2374         /* Process beacon from the current BSS */
2375         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2376         if (baselen > len)
2377                 return;
2378
2379         if (rx_status->freq != local->oper_channel->center_freq)
2380                 return;
2381
2382         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2383             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2384                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2385                                        len - baselen, &elems);
2386
2387                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2388                                       false);
2389                 ifmgd->assoc_data->have_beacon = true;
2390                 ifmgd->assoc_data->sent_assoc = false;
2391                 /* continue assoc process */
2392                 ifmgd->assoc_data->timeout = jiffies;
2393                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2394                 return;
2395         }
2396
2397         if (!ifmgd->associated ||
2398             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2399                 return;
2400         bssid = ifmgd->associated->bssid;
2401
2402         /* Track average RSSI from the Beacon frames of the current AP */
2403         ifmgd->last_beacon_signal = rx_status->signal;
2404         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2405                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2406                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2407                 ifmgd->last_cqm_event_signal = 0;
2408                 ifmgd->count_beacon_signal = 1;
2409                 ifmgd->last_ave_beacon_signal = 0;
2410         } else {
2411                 ifmgd->ave_beacon_signal =
2412                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2413                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2414                          ifmgd->ave_beacon_signal) / 16;
2415                 ifmgd->count_beacon_signal++;
2416         }
2417
2418         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2419             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2420                 int sig = ifmgd->ave_beacon_signal;
2421                 int last_sig = ifmgd->last_ave_beacon_signal;
2422
2423                 /*
2424                  * if signal crosses either of the boundaries, invoke callback
2425                  * with appropriate parameters
2426                  */
2427                 if (sig > ifmgd->rssi_max_thold &&
2428                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2429                         ifmgd->last_ave_beacon_signal = sig;
2430                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2431                 } else if (sig < ifmgd->rssi_min_thold &&
2432                            (last_sig >= ifmgd->rssi_max_thold ||
2433                            last_sig == 0)) {
2434                         ifmgd->last_ave_beacon_signal = sig;
2435                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2436                 }
2437         }
2438
2439         if (bss_conf->cqm_rssi_thold &&
2440             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2441             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2442                 int sig = ifmgd->ave_beacon_signal / 16;
2443                 int last_event = ifmgd->last_cqm_event_signal;
2444                 int thold = bss_conf->cqm_rssi_thold;
2445                 int hyst = bss_conf->cqm_rssi_hyst;
2446                 if (sig < thold &&
2447                     (last_event == 0 || sig < last_event - hyst)) {
2448                         ifmgd->last_cqm_event_signal = sig;
2449                         ieee80211_cqm_rssi_notify(
2450                                 &sdata->vif,
2451                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2452                                 GFP_KERNEL);
2453                 } else if (sig > thold &&
2454                            (last_event == 0 || sig > last_event + hyst)) {
2455                         ifmgd->last_cqm_event_signal = sig;
2456                         ieee80211_cqm_rssi_notify(
2457                                 &sdata->vif,
2458                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2459                                 GFP_KERNEL);
2460                 }
2461         }
2462
2463         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2464                 mlme_dbg_ratelimited(sdata,
2465                                      "cancelling probereq poll due to a received beacon\n");
2466                 mutex_lock(&local->mtx);
2467                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2468                 ieee80211_run_deferred_scan(local);
2469                 mutex_unlock(&local->mtx);
2470
2471                 mutex_lock(&local->iflist_mtx);
2472                 ieee80211_recalc_ps(local, -1);
2473                 mutex_unlock(&local->iflist_mtx);
2474         }
2475
2476         /*
2477          * Push the beacon loss detection into the future since
2478          * we are processing a beacon from the AP just now.
2479          */
2480         ieee80211_sta_reset_beacon_monitor(sdata);
2481
2482         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2483         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2484                                           len - baselen, &elems,
2485                                           care_about_ies, ncrc);
2486
2487         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2488                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2489                                                    ifmgd->aid);
2490
2491         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2492                 if (directed_tim) {
2493                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2494                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2495                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2496                                         ieee80211_hw_config(local,
2497                                                             IEEE80211_CONF_CHANGE_PS);
2498                                 }
2499                                 ieee80211_send_nullfunc(local, sdata, 0);
2500                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2501                                 local->pspolling = true;
2502
2503                                 /*
2504                                  * Here is assumed that the driver will be
2505                                  * able to send ps-poll frame and receive a
2506                                  * response even though power save mode is
2507                                  * enabled, but some drivers might require
2508                                  * to disable power save here. This needs
2509                                  * to be investigated.
2510                                  */
2511                                 ieee80211_send_pspoll(local, sdata);
2512                         }
2513                 }
2514         }
2515
2516         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2517                 return;
2518         ifmgd->beacon_crc = ncrc;
2519         ifmgd->beacon_crc_valid = true;
2520
2521         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2522                               true);
2523
2524         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2525                                      elems.wmm_param_len))
2526                 changed |= BSS_CHANGED_QOS;
2527
2528         if (elems.erp_info && elems.erp_info_len >= 1) {
2529                 erp_valid = true;
2530                 erp_value = elems.erp_info[0];
2531         } else {
2532                 erp_valid = false;
2533         }
2534         changed |= ieee80211_handle_bss_capability(sdata,
2535                         le16_to_cpu(mgmt->u.beacon.capab_info),
2536                         erp_valid, erp_value);
2537
2538
2539         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2540             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2541                 struct ieee80211_supported_band *sband;
2542
2543                 sband = local->hw.wiphy->bands[local->oper_channel->band];
2544
2545                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2546                                                   bssid, true);
2547         }
2548
2549         /* Note: country IE parsing is done for us by cfg80211 */
2550         if (elems.country_elem) {
2551                 /* TODO: IBSS also needs this */
2552                 if (elems.pwr_constr_elem)
2553                         ieee80211_handle_pwr_constr(sdata,
2554                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2555                                 elems.pwr_constr_elem,
2556                                 elems.pwr_constr_elem_len);
2557         }
2558
2559         ieee80211_bss_info_change_notify(sdata, changed);
2560 }
2561
2562 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2563                                   struct sk_buff *skb)
2564 {
2565         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2566         struct ieee80211_rx_status *rx_status;
2567         struct ieee80211_mgmt *mgmt;
2568         struct cfg80211_bss *bss = NULL;
2569         enum rx_mgmt_action rma = RX_MGMT_NONE;
2570         u16 fc;
2571
2572         rx_status = (struct ieee80211_rx_status *) skb->cb;
2573         mgmt = (struct ieee80211_mgmt *) skb->data;
2574         fc = le16_to_cpu(mgmt->frame_control);
2575
2576         mutex_lock(&ifmgd->mtx);
2577
2578         switch (fc & IEEE80211_FCTL_STYPE) {
2579         case IEEE80211_STYPE_BEACON:
2580                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2581                 break;
2582         case IEEE80211_STYPE_PROBE_RESP:
2583                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2584                 break;
2585         case IEEE80211_STYPE_AUTH:
2586                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2587                 break;
2588         case IEEE80211_STYPE_DEAUTH:
2589                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2590                 break;
2591         case IEEE80211_STYPE_DISASSOC:
2592                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2593                 break;
2594         case IEEE80211_STYPE_ASSOC_RESP:
2595         case IEEE80211_STYPE_REASSOC_RESP:
2596                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2597                 break;
2598         case IEEE80211_STYPE_ACTION:
2599                 switch (mgmt->u.action.category) {
2600                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2601                         ieee80211_sta_process_chanswitch(sdata,
2602                                         &mgmt->u.action.u.chan_switch.sw_elem,
2603                                         (void *)ifmgd->associated->priv,
2604                                         rx_status->mactime);
2605                         break;
2606                 }
2607         }
2608         mutex_unlock(&ifmgd->mtx);
2609
2610         switch (rma) {
2611         case RX_MGMT_NONE:
2612                 /* no action */
2613                 break;
2614         case RX_MGMT_CFG80211_DEAUTH:
2615                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2616                 break;
2617         case RX_MGMT_CFG80211_DISASSOC:
2618                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2619                 break;
2620         case RX_MGMT_CFG80211_RX_AUTH:
2621                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2622                 break;
2623         case RX_MGMT_CFG80211_RX_ASSOC:
2624                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2625                 break;
2626         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2627                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2628                 break;
2629         default:
2630                 WARN(1, "unexpected: %d", rma);
2631         }
2632 }
2633
2634 static void ieee80211_sta_timer(unsigned long data)
2635 {
2636         struct ieee80211_sub_if_data *sdata =
2637                 (struct ieee80211_sub_if_data *) data;
2638         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2639         struct ieee80211_local *local = sdata->local;
2640
2641         if (local->quiescing) {
2642                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2643                 return;
2644         }
2645
2646         ieee80211_queue_work(&local->hw, &sdata->work);
2647 }
2648
2649 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2650                                           u8 *bssid, u8 reason)
2651 {
2652         struct ieee80211_local *local = sdata->local;
2653         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2654         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2655
2656         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2657                                false, frame_buf);
2658         mutex_unlock(&ifmgd->mtx);
2659
2660         /*
2661          * must be outside lock due to cfg80211,
2662          * but that's not a problem.
2663          */
2664         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2665
2666         mutex_lock(&local->mtx);
2667         ieee80211_recalc_idle(local);
2668         mutex_unlock(&local->mtx);
2669
2670         mutex_lock(&ifmgd->mtx);
2671 }
2672
2673 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2674 {
2675         struct ieee80211_local *local = sdata->local;
2676         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2677         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2678
2679         lockdep_assert_held(&ifmgd->mtx);
2680
2681         if (WARN_ON_ONCE(!auth_data))
2682                 return -EINVAL;
2683
2684         auth_data->tries++;
2685
2686         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2687                 sdata_info(sdata, "authentication with %pM timed out\n",
2688                            auth_data->bss->bssid);
2689
2690                 /*
2691                  * Most likely AP is not in the range so remove the
2692                  * bss struct for that AP.
2693                  */
2694                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2695
2696                 return -ETIMEDOUT;
2697         }
2698
2699         drv_mgd_prepare_tx(local, sdata);
2700
2701         if (auth_data->bss->proberesp_ies) {
2702                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2703                            auth_data->bss->bssid, auth_data->tries,
2704                            IEEE80211_AUTH_MAX_TRIES);
2705
2706                 auth_data->expected_transaction = 2;
2707                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2708                                     auth_data->ie, auth_data->ie_len,
2709                                     auth_data->bss->bssid,
2710                                     auth_data->bss->bssid, NULL, 0, 0);
2711         } else {
2712                 const u8 *ssidie;
2713
2714                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2715                            auth_data->bss->bssid, auth_data->tries,
2716                            IEEE80211_AUTH_MAX_TRIES);
2717
2718                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2719                 if (!ssidie)
2720                         return -EINVAL;
2721                 /*
2722                  * Direct probe is sent to broadcast address as some APs
2723                  * will not answer to direct packet in unassociated state.
2724                  */
2725                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2726                                          NULL, 0, (u32) -1, true, false,
2727                                          auth_data->bss->channel);
2728         }
2729
2730         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2731         run_again(ifmgd, auth_data->timeout);
2732
2733         return 0;
2734 }
2735
2736 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2737 {
2738         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2739         struct ieee80211_local *local = sdata->local;
2740
2741         lockdep_assert_held(&sdata->u.mgd.mtx);
2742
2743         assoc_data->tries++;
2744         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2745                 sdata_info(sdata, "association with %pM timed out\n",
2746                            assoc_data->bss->bssid);
2747
2748                 /*
2749                  * Most likely AP is not in the range so remove the
2750                  * bss struct for that AP.
2751                  */
2752                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2753
2754                 return -ETIMEDOUT;
2755         }
2756
2757         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2758                    assoc_data->bss->bssid, assoc_data->tries,
2759                    IEEE80211_ASSOC_MAX_TRIES);
2760         ieee80211_send_assoc(sdata);
2761
2762         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2763         run_again(&sdata->u.mgd, assoc_data->timeout);
2764
2765         return 0;
2766 }
2767
2768 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2769 {
2770         struct ieee80211_local *local = sdata->local;
2771         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2772
2773         mutex_lock(&ifmgd->mtx);
2774
2775         if (ifmgd->auth_data &&
2776             time_after(jiffies, ifmgd->auth_data->timeout)) {
2777                 if (ifmgd->auth_data->done) {
2778                         /*
2779                          * ok ... we waited for assoc but userspace didn't,
2780                          * so let's just kill the auth data
2781                          */
2782                         ieee80211_destroy_auth_data(sdata, false);
2783                 } else if (ieee80211_probe_auth(sdata)) {
2784                         u8 bssid[ETH_ALEN];
2785
2786                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2787
2788                         ieee80211_destroy_auth_data(sdata, false);
2789
2790                         mutex_unlock(&ifmgd->mtx);
2791                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2792                         mutex_lock(&ifmgd->mtx);
2793                 }
2794         } else if (ifmgd->auth_data)
2795                 run_again(ifmgd, ifmgd->auth_data->timeout);
2796
2797         if (ifmgd->assoc_data &&
2798             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2799                 if (!ifmgd->assoc_data->have_beacon ||
2800                     ieee80211_do_assoc(sdata)) {
2801                         u8 bssid[ETH_ALEN];
2802
2803                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2804
2805                         ieee80211_destroy_assoc_data(sdata, false);
2806
2807                         mutex_unlock(&ifmgd->mtx);
2808                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2809                         mutex_lock(&ifmgd->mtx);
2810                 }
2811         } else if (ifmgd->assoc_data)
2812                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2813
2814         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2815                             IEEE80211_STA_CONNECTION_POLL) &&
2816             ifmgd->associated) {
2817                 u8 bssid[ETH_ALEN];
2818                 int max_tries;
2819
2820                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2821
2822                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2823                         max_tries = max_nullfunc_tries;
2824                 else
2825                         max_tries = max_probe_tries;
2826
2827                 /* ACK received for nullfunc probing frame */
2828                 if (!ifmgd->probe_send_count)
2829                         ieee80211_reset_ap_probe(sdata);
2830                 else if (ifmgd->nullfunc_failed) {
2831                         if (ifmgd->probe_send_count < max_tries) {
2832                                 mlme_dbg(sdata,
2833                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2834                                          bssid, ifmgd->probe_send_count,
2835                                          max_tries);
2836                                 ieee80211_mgd_probe_ap_send(sdata);
2837                         } else {
2838                                 mlme_dbg(sdata,
2839                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2840                                          bssid);
2841                                 ieee80211_sta_connection_lost(sdata, bssid,
2842                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2843                         }
2844                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2845                         run_again(ifmgd, ifmgd->probe_timeout);
2846                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2847                         mlme_dbg(sdata,
2848                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2849                                  bssid, probe_wait_ms);
2850                         ieee80211_sta_connection_lost(sdata, bssid,
2851                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2852                 } else if (ifmgd->probe_send_count < max_tries) {
2853                         mlme_dbg(sdata,
2854                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2855                                  bssid, probe_wait_ms,
2856                                  ifmgd->probe_send_count, max_tries);
2857                         ieee80211_mgd_probe_ap_send(sdata);
2858                 } else {
2859                         /*
2860                          * We actually lost the connection ... or did we?
2861                          * Let's make sure!
2862                          */
2863                         wiphy_debug(local->hw.wiphy,
2864                                     "%s: No probe response from AP %pM"
2865                                     " after %dms, disconnecting.\n",
2866                                     sdata->name,
2867                                     bssid, probe_wait_ms);
2868
2869                         ieee80211_sta_connection_lost(sdata, bssid,
2870                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2871                 }
2872         }
2873
2874         mutex_unlock(&ifmgd->mtx);
2875
2876         mutex_lock(&local->mtx);
2877         ieee80211_recalc_idle(local);
2878         mutex_unlock(&local->mtx);
2879 }
2880
2881 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2882 {
2883         struct ieee80211_sub_if_data *sdata =
2884                 (struct ieee80211_sub_if_data *) data;
2885         struct ieee80211_local *local = sdata->local;
2886
2887         if (local->quiescing)
2888                 return;
2889
2890         ieee80211_queue_work(&sdata->local->hw,
2891                              &sdata->u.mgd.beacon_connection_loss_work);
2892 }
2893
2894 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2895 {
2896         struct ieee80211_sub_if_data *sdata =
2897                 (struct ieee80211_sub_if_data *) data;
2898         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2899         struct ieee80211_local *local = sdata->local;
2900
2901         if (local->quiescing)
2902                 return;
2903
2904         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2905 }
2906
2907 static void ieee80211_sta_monitor_work(struct work_struct *work)
2908 {
2909         struct ieee80211_sub_if_data *sdata =
2910                 container_of(work, struct ieee80211_sub_if_data,
2911                              u.mgd.monitor_work);
2912
2913         ieee80211_mgd_probe_ap(sdata, false);
2914 }
2915
2916 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2917 {
2918         u32 flags;
2919
2920         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2921                 __ieee80211_stop_poll(sdata);
2922
2923                 /* let's probe the connection once */
2924                 flags = sdata->local->hw.flags;
2925                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2926                         ieee80211_queue_work(&sdata->local->hw,
2927                                              &sdata->u.mgd.monitor_work);
2928                 /* and do all the other regular work too */
2929                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2930         }
2931 }
2932
2933 #ifdef CONFIG_PM
2934 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2935 {
2936         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2937
2938         /*
2939          * we need to use atomic bitops for the running bits
2940          * only because both timers might fire at the same
2941          * time -- the code here is properly synchronised.
2942          */
2943
2944         cancel_work_sync(&ifmgd->request_smps_work);
2945
2946         cancel_work_sync(&ifmgd->monitor_work);
2947         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2948         cancel_work_sync(&ifmgd->csa_connection_drop_work);
2949         if (del_timer_sync(&ifmgd->timer))
2950                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2951
2952         cancel_work_sync(&ifmgd->chswitch_work);
2953         if (del_timer_sync(&ifmgd->chswitch_timer))
2954                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2955
2956         /* these will just be re-established on connection */
2957         del_timer_sync(&ifmgd->conn_mon_timer);
2958         del_timer_sync(&ifmgd->bcn_mon_timer);
2959 }
2960
2961 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2962 {
2963         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2964
2965         if (!ifmgd->associated)
2966                 return;
2967
2968         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2969                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2970                 mutex_lock(&ifmgd->mtx);
2971                 if (ifmgd->associated) {
2972                         mlme_dbg(sdata,
2973                                  "driver requested disconnect after resume\n");
2974                         ieee80211_sta_connection_lost(sdata,
2975                                 ifmgd->associated->bssid,
2976                                 WLAN_REASON_UNSPECIFIED);
2977                         mutex_unlock(&ifmgd->mtx);
2978                         return;
2979                 }
2980                 mutex_unlock(&ifmgd->mtx);
2981         }
2982
2983         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2984                 add_timer(&ifmgd->timer);
2985         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2986                 add_timer(&ifmgd->chswitch_timer);
2987         ieee80211_sta_reset_beacon_monitor(sdata);
2988
2989         mutex_lock(&sdata->local->mtx);
2990         ieee80211_restart_sta_timer(sdata);
2991         mutex_unlock(&sdata->local->mtx);
2992 }
2993 #endif
2994
2995 /* interface setup */
2996 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2997 {
2998         struct ieee80211_if_managed *ifmgd;
2999
3000         ifmgd = &sdata->u.mgd;
3001         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3002         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3003         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3004                   ieee80211_beacon_connection_loss_work);
3005         INIT_WORK(&ifmgd->csa_connection_drop_work,
3006                   ieee80211_csa_connection_drop_work);
3007         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3008         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3009                     (unsigned long) sdata);
3010         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3011                     (unsigned long) sdata);
3012         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3013                     (unsigned long) sdata);
3014         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3015                     (unsigned long) sdata);
3016
3017         ifmgd->flags = 0;
3018         ifmgd->powersave = sdata->wdev.ps;
3019         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3020         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3021
3022         mutex_init(&ifmgd->mtx);
3023
3024         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3025                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3026         else
3027                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3028 }
3029
3030 /* scan finished notification */
3031 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3032 {
3033         struct ieee80211_sub_if_data *sdata;
3034
3035         /* Restart STA timers */
3036         rcu_read_lock();
3037         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3038                 ieee80211_restart_sta_timer(sdata);
3039         rcu_read_unlock();
3040 }
3041
3042 int ieee80211_max_network_latency(struct notifier_block *nb,
3043                                   unsigned long data, void *dummy)
3044 {
3045         s32 latency_usec = (s32) data;
3046         struct ieee80211_local *local =
3047                 container_of(nb, struct ieee80211_local,
3048                              network_latency_notifier);
3049
3050         mutex_lock(&local->iflist_mtx);
3051         ieee80211_recalc_ps(local, latency_usec);
3052         mutex_unlock(&local->iflist_mtx);
3053
3054         return 0;
3055 }
3056
3057 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3058                                   struct cfg80211_bss *cbss)
3059 {
3060         struct ieee80211_local *local = sdata->local;
3061         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3062         int ht_cfreq;
3063         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3064         const u8 *ht_oper_ie;
3065         const struct ieee80211_ht_operation *ht_oper = NULL;
3066         struct ieee80211_supported_band *sband;
3067
3068         sband = local->hw.wiphy->bands[cbss->channel->band];
3069
3070         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3071
3072         if (sband->ht_cap.ht_supported) {
3073                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3074                                               cbss->information_elements,
3075                                               cbss->len_information_elements);
3076                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3077                         ht_oper = (void *)(ht_oper_ie + 2);
3078         }
3079
3080         if (ht_oper) {
3081                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3082                                                           cbss->channel->band);
3083                 /* check that channel matches the right operating channel */
3084                 if (cbss->channel->center_freq != ht_cfreq) {
3085                         /*
3086                          * It's possible that some APs are confused here;
3087                          * Netgear WNDR3700 sometimes reports 4 higher than
3088                          * the actual channel in association responses, but
3089                          * since we look at probe response/beacon data here
3090                          * it should be OK.
3091                          */
3092                         sdata_info(sdata,
3093                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3094                                    cbss->channel->center_freq,
3095                                    ht_cfreq, ht_oper->primary_chan,
3096                                    cbss->channel->band);
3097                         ht_oper = NULL;
3098                 }
3099         }
3100
3101         if (ht_oper) {
3102                 channel_type = NL80211_CHAN_HT20;
3103
3104                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3105                         switch (ht_oper->ht_param &
3106                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3107                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3108                                 channel_type = NL80211_CHAN_HT40PLUS;
3109                                 break;
3110                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3111                                 channel_type = NL80211_CHAN_HT40MINUS;
3112                                 break;
3113                         }
3114                 }
3115         }
3116
3117         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3118                 /* can only fail due to HT40+/- mismatch */
3119                 channel_type = NL80211_CHAN_HT20;
3120                 sdata_info(sdata,
3121                            "disabling 40 MHz due to multi-vif mismatch\n");
3122                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3123                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3124                                                     channel_type));
3125         }
3126
3127         local->oper_channel = cbss->channel;
3128         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3129
3130         return 0;
3131 }
3132
3133 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3134                                      struct cfg80211_bss *cbss, bool assoc)
3135 {
3136         struct ieee80211_local *local = sdata->local;
3137         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3138         struct ieee80211_bss *bss = (void *)cbss->priv;
3139         struct sta_info *new_sta = NULL;
3140         bool have_sta = false;
3141         int err;
3142
3143         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3144                 return -EINVAL;
3145
3146         if (assoc) {
3147                 rcu_read_lock();
3148                 have_sta = sta_info_get(sdata, cbss->bssid);
3149                 rcu_read_unlock();
3150         }
3151
3152         if (!have_sta) {
3153                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3154                 if (!new_sta)
3155                         return -ENOMEM;
3156         }
3157
3158         mutex_lock(&local->mtx);
3159         ieee80211_recalc_idle(sdata->local);
3160         mutex_unlock(&local->mtx);
3161
3162         if (new_sta) {
3163                 u32 rates = 0, basic_rates = 0;
3164                 bool have_higher_than_11mbit;
3165                 int min_rate = INT_MAX, min_rate_index = -1;
3166                 struct ieee80211_supported_band *sband;
3167
3168                 sband = local->hw.wiphy->bands[cbss->channel->band];
3169
3170                 err = ieee80211_prep_channel(sdata, cbss);
3171                 if (err) {
3172                         sta_info_free(local, new_sta);
3173                         return err;
3174                 }
3175
3176                 ieee80211_get_rates(sband, bss->supp_rates,
3177                                     bss->supp_rates_len,
3178                                     &rates, &basic_rates,
3179                                     &have_higher_than_11mbit,
3180                                     &min_rate, &min_rate_index);
3181
3182                 /*
3183                  * This used to be a workaround for basic rates missing
3184                  * in the association response frame. Now that we no
3185                  * longer use the basic rates from there, it probably
3186                  * doesn't happen any more, but keep the workaround so
3187                  * in case some *other* APs are buggy in different ways
3188                  * we can connect -- with a warning.
3189                  */
3190                 if (!basic_rates && min_rate_index >= 0) {
3191                         sdata_info(sdata,
3192                                    "No basic rates, using min rate instead\n");
3193                         basic_rates = BIT(min_rate_index);
3194                 }
3195
3196                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3197                 sdata->vif.bss_conf.basic_rates = basic_rates;
3198
3199                 /* cf. IEEE 802.11 9.2.12 */
3200                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3201                     have_higher_than_11mbit)
3202                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3203                 else
3204                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3205
3206                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3207
3208                 /* set timing information */
3209                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3210                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3211                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3212
3213                 /* tell driver about BSSID, basic rates and timing */
3214                 ieee80211_bss_info_change_notify(sdata,
3215                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3216                         BSS_CHANGED_BEACON_INT);
3217
3218                 if (assoc)
3219                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3220
3221                 err = sta_info_insert(new_sta);
3222                 new_sta = NULL;
3223                 if (err) {
3224                         sdata_info(sdata,
3225                                    "failed to insert STA entry for the AP (error %d)\n",
3226                                    err);
3227                         return err;
3228                 }
3229         } else
3230                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3231
3232         return 0;
3233 }
3234
3235 /* config hooks */
3236 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3237                        struct cfg80211_auth_request *req)
3238 {
3239         struct ieee80211_local *local = sdata->local;
3240         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3241         struct ieee80211_mgd_auth_data *auth_data;
3242         u16 auth_alg;
3243         int err;
3244
3245         /* prepare auth data structure */
3246
3247         switch (req->auth_type) {
3248         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3249                 auth_alg = WLAN_AUTH_OPEN;
3250                 break;
3251         case NL80211_AUTHTYPE_SHARED_KEY:
3252                 if (IS_ERR(local->wep_tx_tfm))
3253                         return -EOPNOTSUPP;
3254                 auth_alg = WLAN_AUTH_SHARED_KEY;
3255                 break;
3256         case NL80211_AUTHTYPE_FT:
3257                 auth_alg = WLAN_AUTH_FT;
3258                 break;
3259         case NL80211_AUTHTYPE_NETWORK_EAP:
3260                 auth_alg = WLAN_AUTH_LEAP;
3261                 break;
3262         default:
3263                 return -EOPNOTSUPP;
3264         }
3265
3266         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3267         if (!auth_data)
3268                 return -ENOMEM;
3269
3270         auth_data->bss = req->bss;
3271
3272         if (req->ie && req->ie_len) {
3273                 memcpy(auth_data->ie, req->ie, req->ie_len);
3274                 auth_data->ie_len = req->ie_len;
3275         }
3276
3277         if (req->key && req->key_len) {
3278                 auth_data->key_len = req->key_len;
3279                 auth_data->key_idx = req->key_idx;
3280                 memcpy(auth_data->key, req->key, req->key_len);
3281         }
3282
3283         auth_data->algorithm = auth_alg;
3284
3285         /* try to authenticate/probe */
3286
3287         mutex_lock(&ifmgd->mtx);
3288
3289         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3290             ifmgd->assoc_data) {
3291                 err = -EBUSY;
3292                 goto err_free;
3293         }
3294
3295         if (ifmgd->auth_data)
3296                 ieee80211_destroy_auth_data(sdata, false);
3297
3298         /* prep auth_data so we don't go into idle on disassoc */
3299         ifmgd->auth_data = auth_data;
3300
3301         if (ifmgd->associated)
3302                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3303
3304         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3305
3306         err = ieee80211_prep_connection(sdata, req->bss, false);
3307         if (err)
3308                 goto err_clear;
3309
3310         err = ieee80211_probe_auth(sdata);
3311         if (err) {
3312                 sta_info_destroy_addr(sdata, req->bss->bssid);
3313                 goto err_clear;
3314         }
3315
3316         /* hold our own reference */
3317         cfg80211_ref_bss(auth_data->bss);
3318         err = 0;
3319         goto out_unlock;
3320
3321  err_clear:
3322         memset(ifmgd->bssid, 0, ETH_ALEN);
3323         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3324         ifmgd->auth_data = NULL;
3325  err_free:
3326         kfree(auth_data);
3327  out_unlock:
3328         mutex_unlock(&ifmgd->mtx);
3329
3330         return err;
3331 }
3332
3333 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3334                         struct cfg80211_assoc_request *req)
3335 {
3336         struct ieee80211_local *local = sdata->local;
3337         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3338         struct ieee80211_bss *bss = (void *)req->bss->priv;
3339         struct ieee80211_mgd_assoc_data *assoc_data;
3340         struct ieee80211_supported_band *sband;
3341         const u8 *ssidie, *ht_ie;
3342         int i, err;
3343
3344         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3345         if (!ssidie)
3346                 return -EINVAL;
3347
3348         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3349         if (!assoc_data)
3350                 return -ENOMEM;
3351
3352         mutex_lock(&ifmgd->mtx);
3353
3354         if (ifmgd->associated)
3355                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3356
3357         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3358                 err = -EBUSY;
3359                 goto err_free;
3360         }
3361
3362         if (ifmgd->assoc_data) {
3363                 err = -EBUSY;
3364                 goto err_free;
3365         }
3366
3367         if (ifmgd->auth_data) {
3368                 bool match;
3369
3370                 /* keep sta info, bssid if matching */
3371                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3372                 ieee80211_destroy_auth_data(sdata, match);
3373         }
3374
3375         /* prepare assoc data */
3376
3377         /*
3378          * keep only the 40 MHz disable bit set as it might have
3379          * been set during authentication already, all other bits
3380          * should be reset for a new connection
3381          */
3382         ifmgd->flags &= IEEE80211_STA_DISABLE_40MHZ;
3383
3384         ifmgd->beacon_crc_valid = false;
3385
3386         /*
3387          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3388          * We still associate in non-HT mode (11a/b/g) if any one of these
3389          * ciphers is configured as pairwise.
3390          * We can set this to true for non-11n hardware, that'll be checked
3391          * separately along with the peer capabilities.
3392          */
3393         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3394                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3395                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3396                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3397                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3398                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3399                         netdev_info(sdata->dev,
3400                                     "disabling HT/VHT due to WEP/TKIP use\n");
3401                 }
3402         }
3403
3404         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3405                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3406                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3407         }
3408
3409         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3410         sband = local->hw.wiphy->bands[req->bss->channel->band];
3411         if (!sband->ht_cap.ht_supported ||
3412             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3413                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3414                 if (!bss->wmm_used)
3415                         netdev_info(sdata->dev,
3416                                     "disabling HT as WMM/QoS is not supported by the AP\n");
3417         }
3418
3419         /* disable VHT if we don't support it or the AP doesn't use WMM */
3420         if (!sband->vht_cap.vht_supported ||
3421             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3422                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3423                 if (!bss->wmm_used)
3424                         netdev_info(sdata->dev,
3425                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
3426         }
3427
3428         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3429         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3430                sizeof(ifmgd->ht_capa_mask));
3431
3432         if (req->ie && req->ie_len) {
3433                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3434                 assoc_data->ie_len = req->ie_len;
3435         }
3436
3437         assoc_data->bss = req->bss;
3438
3439         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3440                 if (ifmgd->powersave)
3441                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3442                 else
3443                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3444         } else
3445                 ifmgd->ap_smps = ifmgd->req_smps;
3446
3447         assoc_data->capability = req->bss->capability;
3448         assoc_data->wmm = bss->wmm_used &&
3449                           (local->hw.queues >= IEEE80211_NUM_ACS);
3450         assoc_data->supp_rates = bss->supp_rates;
3451         assoc_data->supp_rates_len = bss->supp_rates_len;
3452
3453         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3454         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3455                 assoc_data->ap_ht_param =
3456                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3457         else
3458                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3459
3460         if (bss->wmm_used && bss->uapsd_supported &&
3461             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3462                 assoc_data->uapsd = true;
3463                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3464         } else {
3465                 assoc_data->uapsd = false;
3466                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3467         }
3468
3469         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3470         assoc_data->ssid_len = ssidie[1];
3471
3472         if (req->prev_bssid)
3473                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3474
3475         if (req->use_mfp) {
3476                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3477                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3478         } else {
3479                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3480                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3481         }
3482
3483         if (req->crypto.control_port)
3484                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3485         else
3486                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3487
3488         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3489         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3490
3491         /* kick off associate process */
3492
3493         ifmgd->assoc_data = assoc_data;
3494
3495         err = ieee80211_prep_connection(sdata, req->bss, true);
3496         if (err)
3497                 goto err_clear;
3498
3499         if (!bss->dtim_period &&
3500             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3501                 /*
3502                  * Wait up to one beacon interval ...
3503                  * should this be more if we miss one?
3504                  */
3505                 sdata_info(sdata, "waiting for beacon from %pM\n",
3506                            ifmgd->bssid);
3507                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3508         } else {
3509                 assoc_data->have_beacon = true;
3510                 assoc_data->sent_assoc = false;
3511                 assoc_data->timeout = jiffies;
3512         }
3513         run_again(ifmgd, assoc_data->timeout);
3514
3515         if (bss->corrupt_data) {
3516                 char *corrupt_type = "data";
3517                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3518                         if (bss->corrupt_data &
3519                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3520                                 corrupt_type = "beacon and probe response";
3521                         else
3522                                 corrupt_type = "beacon";
3523                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3524                         corrupt_type = "probe response";
3525                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3526                            corrupt_type);
3527         }
3528
3529         err = 0;
3530         goto out;
3531  err_clear:
3532         memset(ifmgd->bssid, 0, ETH_ALEN);
3533         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3534         ifmgd->assoc_data = NULL;
3535  err_free:
3536         kfree(assoc_data);
3537  out:
3538         mutex_unlock(&ifmgd->mtx);
3539
3540         return err;
3541 }
3542
3543 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3544                          struct cfg80211_deauth_request *req)
3545 {
3546         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3547         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3548
3549         mutex_lock(&ifmgd->mtx);
3550
3551         if (ifmgd->auth_data) {
3552                 ieee80211_destroy_auth_data(sdata, false);
3553                 mutex_unlock(&ifmgd->mtx);
3554                 return 0;
3555         }
3556
3557         sdata_info(sdata,
3558                    "deauthenticating from %pM by local choice (reason=%d)\n",
3559                    req->bssid, req->reason_code);
3560
3561         if (ifmgd->associated &&
3562             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
3563                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3564                                        req->reason_code, true, frame_buf);
3565         } else {
3566                 drv_mgd_prepare_tx(sdata->local, sdata);
3567                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3568                                                IEEE80211_STYPE_DEAUTH,
3569                                                req->reason_code, true,
3570                                                frame_buf);
3571         }
3572
3573         mutex_unlock(&ifmgd->mtx);
3574
3575         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3576
3577         mutex_lock(&sdata->local->mtx);
3578         ieee80211_recalc_idle(sdata->local);
3579         mutex_unlock(&sdata->local->mtx);
3580
3581         return 0;
3582 }
3583
3584 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3585                            struct cfg80211_disassoc_request *req)
3586 {
3587         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3588         u8 bssid[ETH_ALEN];
3589         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3590
3591         mutex_lock(&ifmgd->mtx);
3592
3593         /*
3594          * cfg80211 should catch this ... but it's racy since
3595          * we can receive a disassoc frame, process it, hand it
3596          * to cfg80211 while that's in a locked section already
3597          * trying to tell us that the user wants to disconnect.
3598          */
3599         if (ifmgd->associated != req->bss) {
3600                 mutex_unlock(&ifmgd->mtx);
3601                 return -ENOLINK;
3602         }
3603
3604         sdata_info(sdata,
3605                    "disassociating from %pM by local choice (reason=%d)\n",
3606                    req->bss->bssid, req->reason_code);
3607
3608         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3609         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3610                                req->reason_code, !req->local_state_change,
3611                                frame_buf);
3612         mutex_unlock(&ifmgd->mtx);
3613
3614         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3615
3616         mutex_lock(&sdata->local->mtx);
3617         ieee80211_recalc_idle(sdata->local);
3618         mutex_unlock(&sdata->local->mtx);
3619
3620         return 0;
3621 }
3622
3623 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3624 {
3625         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3626
3627         mutex_lock(&ifmgd->mtx);
3628         if (ifmgd->assoc_data)
3629                 ieee80211_destroy_assoc_data(sdata, false);
3630         if (ifmgd->auth_data)
3631                 ieee80211_destroy_auth_data(sdata, false);
3632         del_timer_sync(&ifmgd->timer);
3633         mutex_unlock(&ifmgd->mtx);
3634 }
3635
3636 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3637                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3638                                gfp_t gfp)
3639 {
3640         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3641
3642         trace_api_cqm_rssi_notify(sdata, rssi_event);
3643
3644         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3645 }
3646 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);