net/mac80211/mlme.c

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