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
1435 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1436                              struct ieee80211_hdr *hdr)
1437 {
1438         /*
1439          * We can postpone the mgd.timer whenever receiving unicast frames
1440          * from AP because we know that the connection is working both ways
1441          * at that time. But multicast frames (and hence also beacons) must
1442          * be ignored here, because we need to trigger the timer during
1443          * data idle periods for sending the periodic probe request to the
1444          * AP we're connected to.
1445          */
1446         if (is_multicast_ether_addr(hdr->addr1))
1447                 return;
1448
1449         ieee80211_sta_reset_conn_monitor(sdata);
1450 }
1451
1452 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1453 {
1454         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1455         struct ieee80211_local *local = sdata->local;
1456
1457         mutex_lock(&local->mtx);
1458         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1459                               IEEE80211_STA_CONNECTION_POLL))) {
1460                 mutex_unlock(&local->mtx);
1461                 return;
1462         }
1463
1464         __ieee80211_stop_poll(sdata);
1465
1466         mutex_lock(&local->iflist_mtx);
1467         ieee80211_recalc_ps(local, -1);
1468         mutex_unlock(&local->iflist_mtx);
1469
1470         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1471                 goto out;
1472
1473         /*
1474          * We've received a probe response, but are not sure whether
1475          * we have or will be receiving any beacons or data, so let's
1476          * schedule the timers again, just in case.
1477          */
1478         ieee80211_sta_reset_beacon_monitor(sdata);
1479
1480         mod_timer(&ifmgd->conn_mon_timer,
1481                   round_jiffies_up(jiffies +
1482                                    IEEE80211_CONNECTION_IDLE_TIME));
1483 out:
1484         mutex_unlock(&local->mtx);
1485 }
1486
1487 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1488                              struct ieee80211_hdr *hdr, bool ack)
1489 {
1490         if (!ieee80211_is_data(hdr->frame_control))
1491             return;
1492
1493         if (ack)
1494                 ieee80211_sta_reset_conn_monitor(sdata);
1495
1496         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1497             sdata->u.mgd.probe_send_count > 0) {
1498                 if (ack)
1499                         sdata->u.mgd.probe_send_count = 0;
1500                 else
1501                         sdata->u.mgd.nullfunc_failed = true;
1502                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1503         }
1504 }
1505
1506 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1507 {
1508         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1509         const u8 *ssid;
1510         u8 *dst = ifmgd->associated->bssid;
1511         u8 unicast_limit = max(1, max_probe_tries - 3);
1512
1513         /*
1514          * Try sending broadcast probe requests for the last three
1515          * probe requests after the first ones failed since some
1516          * buggy APs only support broadcast probe requests.
1517          */
1518         if (ifmgd->probe_send_count >= unicast_limit)
1519                 dst = NULL;
1520
1521         /*
1522          * When the hardware reports an accurate Tx ACK status, it's
1523          * better to send a nullfunc frame instead of a probe request,
1524          * as it will kick us off the AP quickly if we aren't associated
1525          * anymore. The timeout will be reset if the frame is ACKed by
1526          * the AP.
1527          */
1528         ifmgd->probe_send_count++;
1529
1530         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1531                 ifmgd->nullfunc_failed = false;
1532                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1533         } else {
1534                 int ssid_len;
1535
1536                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1537                 if (WARN_ON_ONCE(ssid == NULL))
1538                         ssid_len = 0;
1539                 else
1540                         ssid_len = ssid[1];
1541
1542                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1543                                          0, (u32) -1, true, false);
1544         }
1545
1546         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1547         run_again(ifmgd, ifmgd->probe_timeout);
1548         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1549                 drv_flush(sdata->local, false);
1550 }
1551
1552 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1553                                    bool beacon)
1554 {
1555         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1556         bool already = false;
1557
1558         if (!ieee80211_sdata_running(sdata))
1559                 return;
1560
1561         mutex_lock(&ifmgd->mtx);
1562
1563         if (!ifmgd->associated)
1564                 goto out;
1565
1566         mutex_lock(&sdata->local->mtx);
1567
1568         if (sdata->local->tmp_channel || sdata->local->scanning) {
1569                 mutex_unlock(&sdata->local->mtx);
1570                 goto out;
1571         }
1572
1573         if (beacon)
1574                 mlme_dbg_ratelimited(sdata,
1575                                      "detected beacon loss from AP - sending probe request\n");
1576
1577         ieee80211_cqm_rssi_notify(&sdata->vif,
1578                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1579
1580         /*
1581          * The driver/our work has already reported this event or the
1582          * connection monitoring has kicked in and we have already sent
1583          * a probe request. Or maybe the AP died and the driver keeps
1584          * reporting until we disassociate...
1585          *
1586          * In either case we have to ignore the current call to this
1587          * function (except for setting the correct probe reason bit)
1588          * because otherwise we would reset the timer every time and
1589          * never check whether we received a probe response!
1590          */
1591         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1592                             IEEE80211_STA_CONNECTION_POLL))
1593                 already = true;
1594
1595         if (beacon)
1596                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1597         else
1598                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1599
1600         mutex_unlock(&sdata->local->mtx);
1601
1602         if (already)
1603                 goto out;
1604
1605         mutex_lock(&sdata->local->iflist_mtx);
1606         ieee80211_recalc_ps(sdata->local, -1);
1607         mutex_unlock(&sdata->local->iflist_mtx);
1608
1609         ifmgd->probe_send_count = 0;
1610         ieee80211_mgd_probe_ap_send(sdata);
1611  out:
1612         mutex_unlock(&ifmgd->mtx);
1613 }
1614
1615 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1616                                           struct ieee80211_vif *vif)
1617 {
1618         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1619         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1620         struct cfg80211_bss *cbss;
1621         struct sk_buff *skb;
1622         const u8 *ssid;
1623         int ssid_len;
1624
1625         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1626                 return NULL;
1627
1628         ASSERT_MGD_MTX(ifmgd);
1629
1630         if (ifmgd->associated)
1631                 cbss = ifmgd->associated;
1632         else if (ifmgd->auth_data)
1633                 cbss = ifmgd->auth_data->bss;
1634         else if (ifmgd->assoc_data)
1635                 cbss = ifmgd->assoc_data->bss;
1636         else
1637                 return NULL;
1638
1639         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1640         if (WARN_ON_ONCE(ssid == NULL))
1641                 ssid_len = 0;
1642         else
1643                 ssid_len = ssid[1];
1644
1645         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1646                                         (u32) -1, ssid + 2, ssid_len,
1647                                         NULL, 0, true);
1648
1649         return skb;
1650 }
1651 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1652
1653 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1654 {
1655         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1656         struct ieee80211_local *local = sdata->local;
1657         u8 bssid[ETH_ALEN];
1658         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1659
1660         mutex_lock(&ifmgd->mtx);
1661         if (!ifmgd->associated) {
1662                 mutex_unlock(&ifmgd->mtx);
1663                 return;
1664         }
1665
1666         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1667
1668         sdata_info(sdata, "Connection to AP %pM lost\n", bssid);
1669
1670         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1671                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1672                                false, frame_buf);
1673         mutex_unlock(&ifmgd->mtx);
1674
1675         /*
1676          * must be outside lock due to cfg80211,
1677          * but that's not a problem.
1678          */
1679         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1680
1681         mutex_lock(&local->mtx);
1682         ieee80211_recalc_idle(local);
1683         mutex_unlock(&local->mtx);
1684 }
1685
1686 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1687 {
1688         struct ieee80211_sub_if_data *sdata =
1689                 container_of(work, struct ieee80211_sub_if_data,
1690                              u.mgd.beacon_connection_loss_work);
1691         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1692         struct sta_info *sta;
1693
1694         if (ifmgd->associated) {
1695                 rcu_read_lock();
1696                 sta = sta_info_get(sdata, ifmgd->bssid);
1697                 if (sta)
1698                         sta->beacon_loss_count++;
1699                 rcu_read_unlock();
1700         }
1701
1702         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1703                 __ieee80211_connection_loss(sdata);
1704         else
1705                 ieee80211_mgd_probe_ap(sdata, true);
1706 }
1707
1708 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1709 {
1710         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1711         struct ieee80211_hw *hw = &sdata->local->hw;
1712
1713         trace_api_beacon_loss(sdata);
1714
1715         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1716         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1717 }
1718 EXPORT_SYMBOL(ieee80211_beacon_loss);
1719
1720 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1721 {
1722         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1723         struct ieee80211_hw *hw = &sdata->local->hw;
1724
1725         trace_api_connection_loss(sdata);
1726
1727         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1728         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1729 }
1730 EXPORT_SYMBOL(ieee80211_connection_loss);
1731
1732
1733 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1734                                         bool assoc)
1735 {
1736         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1737
1738         lockdep_assert_held(&sdata->u.mgd.mtx);
1739
1740         if (!assoc) {
1741                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1742
1743                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1744                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1745         }
1746
1747         cfg80211_put_bss(auth_data->bss);
1748         kfree(auth_data);
1749         sdata->u.mgd.auth_data = NULL;
1750 }
1751
1752 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1753                                      struct ieee80211_mgmt *mgmt, size_t len)
1754 {
1755         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1756         u8 *pos;
1757         struct ieee802_11_elems elems;
1758
1759         pos = mgmt->u.auth.variable;
1760         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1761         if (!elems.challenge)
1762                 return;
1763         auth_data->expected_transaction = 4;
1764         drv_mgd_prepare_tx(sdata->local, sdata);
1765         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1766                             elems.challenge - 2, elems.challenge_len + 2,
1767                             auth_data->bss->bssid, auth_data->bss->bssid,
1768                             auth_data->key, auth_data->key_len,
1769                             auth_data->key_idx);
1770 }
1771
1772 static enum rx_mgmt_action __must_check
1773 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1774                        struct ieee80211_mgmt *mgmt, size_t len)
1775 {
1776         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1777         u8 bssid[ETH_ALEN];
1778         u16 auth_alg, auth_transaction, status_code;
1779         struct sta_info *sta;
1780
1781         lockdep_assert_held(&ifmgd->mtx);
1782
1783         if (len < 24 + 6)
1784                 return RX_MGMT_NONE;
1785
1786         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1787                 return RX_MGMT_NONE;
1788
1789         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1790
1791         if (!ether_addr_equal(bssid, mgmt->bssid))
1792                 return RX_MGMT_NONE;
1793
1794         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1795         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1796         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1797
1798         if (auth_alg != ifmgd->auth_data->algorithm ||
1799             auth_transaction != ifmgd->auth_data->expected_transaction)
1800                 return RX_MGMT_NONE;
1801
1802         if (status_code != WLAN_STATUS_SUCCESS) {
1803                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1804                            mgmt->sa, status_code);
1805                 ieee80211_destroy_auth_data(sdata, false);
1806                 return RX_MGMT_CFG80211_RX_AUTH;
1807         }
1808
1809         switch (ifmgd->auth_data->algorithm) {
1810         case WLAN_AUTH_OPEN:
1811         case WLAN_AUTH_LEAP:
1812         case WLAN_AUTH_FT:
1813                 break;
1814         case WLAN_AUTH_SHARED_KEY:
1815                 if (ifmgd->auth_data->expected_transaction != 4) {
1816                         ieee80211_auth_challenge(sdata, mgmt, len);
1817                         /* need another frame */
1818                         return RX_MGMT_NONE;
1819                 }
1820                 break;
1821         default:
1822                 WARN_ONCE(1, "invalid auth alg %d",
1823                           ifmgd->auth_data->algorithm);
1824                 return RX_MGMT_NONE;
1825         }
1826
1827         sdata_info(sdata, "authenticated\n");
1828         ifmgd->auth_data->done = true;
1829         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1830         run_again(ifmgd, ifmgd->auth_data->timeout);
1831
1832         /* move station state to auth */
1833         mutex_lock(&sdata->local->sta_mtx);
1834         sta = sta_info_get(sdata, bssid);
1835         if (!sta) {
1836                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1837                 goto out_err;
1838         }
1839         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1840                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1841                 goto out_err;
1842         }
1843         mutex_unlock(&sdata->local->sta_mtx);
1844
1845         return RX_MGMT_CFG80211_RX_AUTH;
1846  out_err:
1847         mutex_unlock(&sdata->local->sta_mtx);
1848         /* ignore frame -- wait for timeout */
1849         return RX_MGMT_NONE;
1850 }
1851
1852
1853 static enum rx_mgmt_action __must_check
1854 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1855                          struct ieee80211_mgmt *mgmt, size_t len)
1856 {
1857         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1858         const u8 *bssid = NULL;
1859         u16 reason_code;
1860
1861         lockdep_assert_held(&ifmgd->mtx);
1862
1863         if (len < 24 + 2)
1864                 return RX_MGMT_NONE;
1865
1866         if (!ifmgd->associated ||
1867             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1868                 return RX_MGMT_NONE;
1869
1870         bssid = ifmgd->associated->bssid;
1871
1872         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1873
1874         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1875                    bssid, reason_code);
1876
1877         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1878
1879         mutex_lock(&sdata->local->mtx);
1880         ieee80211_recalc_idle(sdata->local);
1881         mutex_unlock(&sdata->local->mtx);
1882
1883         return RX_MGMT_CFG80211_DEAUTH;
1884 }
1885
1886
1887 static enum rx_mgmt_action __must_check
1888 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1889                            struct ieee80211_mgmt *mgmt, size_t len)
1890 {
1891         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1892         u16 reason_code;
1893
1894         lockdep_assert_held(&ifmgd->mtx);
1895
1896         if (len < 24 + 2)
1897                 return RX_MGMT_NONE;
1898
1899         if (!ifmgd->associated ||
1900             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1901                 return RX_MGMT_NONE;
1902
1903         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1904
1905         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1906                    mgmt->sa, reason_code);
1907
1908         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1909
1910         mutex_lock(&sdata->local->mtx);
1911         ieee80211_recalc_idle(sdata->local);
1912         mutex_unlock(&sdata->local->mtx);
1913
1914         return RX_MGMT_CFG80211_DISASSOC;
1915 }
1916
1917 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1918                                 u8 *supp_rates, unsigned int supp_rates_len,
1919                                 u32 *rates, u32 *basic_rates,
1920                                 bool *have_higher_than_11mbit,
1921                                 int *min_rate, int *min_rate_index)
1922 {
1923         int i, j;
1924
1925         for (i = 0; i < supp_rates_len; i++) {
1926                 int rate = (supp_rates[i] & 0x7f) * 5;
1927                 bool is_basic = !!(supp_rates[i] & 0x80);
1928
1929                 if (rate > 110)
1930                         *have_higher_than_11mbit = true;
1931
1932                 /*
1933                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1934                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1935                  *
1936                  * Note: Even through the membership selector and the basic
1937                  *       rate flag share the same bit, they are not exactly
1938                  *       the same.
1939                  */
1940                 if (!!(supp_rates[i] & 0x80) &&
1941                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1942                         continue;
1943
1944                 for (j = 0; j < sband->n_bitrates; j++) {
1945                         if (sband->bitrates[j].bitrate == rate) {
1946                                 *rates |= BIT(j);
1947                                 if (is_basic)
1948                                         *basic_rates |= BIT(j);
1949                                 if (rate < *min_rate) {
1950                                         *min_rate = rate;
1951                                         *min_rate_index = j;
1952                                 }
1953                                 break;
1954                         }
1955                 }
1956         }
1957 }
1958
1959 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1960                                          bool assoc)
1961 {
1962         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1963
1964         lockdep_assert_held(&sdata->u.mgd.mtx);
1965
1966         if (!assoc) {
1967                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1968
1969                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1970                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1971         }
1972
1973         kfree(assoc_data);
1974         sdata->u.mgd.assoc_data = NULL;
1975 }
1976
1977 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
1978                                     struct cfg80211_bss *cbss,
1979                                     struct ieee80211_mgmt *mgmt, size_t len)
1980 {
1981         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1982         struct ieee80211_local *local = sdata->local;
1983         struct ieee80211_supported_band *sband;
1984         struct sta_info *sta;
1985         u8 *pos;
1986         u16 capab_info, aid;
1987         struct ieee802_11_elems elems;
1988         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1989         u32 changed = 0;
1990         int err;
1991
1992         /* AssocResp and ReassocResp have identical structure */
1993
1994         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1995         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1996
1997         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1998                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
1999                            aid);
2000         aid &= ~(BIT(15) | BIT(14));
2001
2002         ifmgd->broken_ap = false;
2003
2004         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2005                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2006                            aid);
2007                 aid = 0;
2008                 ifmgd->broken_ap = true;
2009         }
2010
2011         pos = mgmt->u.assoc_resp.variable;
2012         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2013
2014         if (!elems.supp_rates) {
2015                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2016                 return false;
2017         }
2018
2019         ifmgd->aid = aid;
2020
2021         mutex_lock(&sdata->local->sta_mtx);
2022         /*
2023          * station info was already allocated and inserted before
2024          * the association and should be available to us
2025          */
2026         sta = sta_info_get(sdata, cbss->bssid);
2027         if (WARN_ON(!sta)) {
2028                 mutex_unlock(&sdata->local->sta_mtx);
2029                 return false;
2030         }
2031
2032         sband = local->hw.wiphy->bands[local->oper_channel->band];
2033
2034         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2035                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2036                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2037
2038         sta->supports_40mhz =
2039                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2040
2041         rate_control_rate_init(sta);
2042
2043         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2044                 set_sta_flag(sta, WLAN_STA_MFP);
2045
2046         if (elems.wmm_param)
2047                 set_sta_flag(sta, WLAN_STA_WME);
2048
2049         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2050         if (!err)
2051                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2052         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2053                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2054         if (err) {
2055                 sdata_info(sdata,
2056                            "failed to move station %pM to desired state\n",
2057                            sta->sta.addr);
2058                 WARN_ON(__sta_info_destroy(sta));
2059                 mutex_unlock(&sdata->local->sta_mtx);
2060                 return false;
2061         }
2062
2063         mutex_unlock(&sdata->local->sta_mtx);
2064
2065         /*
2066          * Always handle WMM once after association regardless
2067          * of the first value the AP uses. Setting -1 here has
2068          * that effect because the AP values is an unsigned
2069          * 4-bit value.
2070          */
2071         ifmgd->wmm_last_param_set = -1;
2072
2073         if (elems.wmm_param)
2074                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2075                                          elems.wmm_param_len);
2076         else
2077                 ieee80211_set_wmm_default(sdata, false);
2078         changed |= BSS_CHANGED_QOS;
2079
2080         if (elems.ht_operation && elems.wmm_param &&
2081             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2082                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2083                                                   cbss->bssid, false);
2084
2085         /* set AID and assoc capability,
2086          * ieee80211_set_associated() will tell the driver */
2087         bss_conf->aid = aid;
2088         bss_conf->assoc_capability = capab_info;
2089         ieee80211_set_associated(sdata, cbss, changed);
2090
2091         /*
2092          * If we're using 4-addr mode, let the AP know that we're
2093          * doing so, so that it can create the STA VLAN on its side
2094          */
2095         if (ifmgd->use_4addr)
2096                 ieee80211_send_4addr_nullfunc(local, sdata);
2097
2098         /*
2099          * Start timer to probe the connection to the AP now.
2100          * Also start the timer that will detect beacon loss.
2101          */
2102         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2103         ieee80211_sta_reset_beacon_monitor(sdata);
2104
2105         return true;
2106 }
2107
2108 static enum rx_mgmt_action __must_check
2109 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2110                              struct ieee80211_mgmt *mgmt, size_t len,
2111                              struct cfg80211_bss **bss)
2112 {
2113         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2114         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2115         u16 capab_info, status_code, aid;
2116         struct ieee802_11_elems elems;
2117         u8 *pos;
2118         bool reassoc;
2119
2120         lockdep_assert_held(&ifmgd->mtx);
2121
2122         if (!assoc_data)
2123                 return RX_MGMT_NONE;
2124         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2125                 return RX_MGMT_NONE;
2126
2127         /*
2128          * AssocResp and ReassocResp have identical structure, so process both
2129          * of them in this function.
2130          */
2131
2132         if (len < 24 + 6)
2133                 return RX_MGMT_NONE;
2134
2135         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2136         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2137         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2138         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2139
2140         sdata_info(sdata,
2141                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2142                    reassoc ? "Rea" : "A", mgmt->sa,
2143                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2144
2145         pos = mgmt->u.assoc_resp.variable;
2146         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2147
2148         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2149             elems.timeout_int && elems.timeout_int_len == 5 &&
2150             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2151                 u32 tu, ms;
2152                 tu = get_unaligned_le32(elems.timeout_int + 1);
2153                 ms = tu * 1024 / 1000;
2154                 sdata_info(sdata,
2155                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2156                            mgmt->sa, tu, ms);
2157                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2158                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2159                         run_again(ifmgd, assoc_data->timeout);
2160                 return RX_MGMT_NONE;
2161         }
2162
2163         *bss = assoc_data->bss;
2164
2165         if (status_code != WLAN_STATUS_SUCCESS) {
2166                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2167                            mgmt->sa, status_code);
2168                 ieee80211_destroy_assoc_data(sdata, false);
2169         } else {
2170                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2171                         /* oops -- internal error -- send timeout for now */
2172                         ieee80211_destroy_assoc_data(sdata, false);
2173                         cfg80211_put_bss(*bss);
2174                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2175                 }
2176                 sdata_info(sdata, "associated\n");
2177
2178                 /*
2179                  * destroy assoc_data afterwards, as otherwise an idle
2180                  * recalc after assoc_data is NULL but before associated
2181                  * is set can cause the interface to go idle
2182                  */
2183                 ieee80211_destroy_assoc_data(sdata, true);
2184         }
2185
2186         return RX_MGMT_CFG80211_RX_ASSOC;
2187 }
2188 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2189                                   struct ieee80211_mgmt *mgmt,
2190                                   size_t len,
2191                                   struct ieee80211_rx_status *rx_status,
2192                                   struct ieee802_11_elems *elems,
2193                                   bool beacon)
2194 {
2195         struct ieee80211_local *local = sdata->local;
2196         int freq;
2197         struct ieee80211_bss *bss;
2198         struct ieee80211_channel *channel;
2199         bool need_ps = false;
2200
2201         if (sdata->u.mgd.associated &&
2202             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2203                 bss = (void *)sdata->u.mgd.associated->priv;
2204                 /* not previously set so we may need to recalc */
2205                 need_ps = !bss->dtim_period;
2206         }
2207
2208         if (elems->ds_params && elems->ds_params_len == 1)
2209                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2210                                                       rx_status->band);
2211         else
2212                 freq = rx_status->freq;
2213
2214         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2215
2216         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2217                 return;
2218
2219         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2220                                         channel, beacon);
2221         if (bss)
2222                 ieee80211_rx_bss_put(local, bss);
2223
2224         if (!sdata->u.mgd.associated)
2225                 return;
2226
2227         if (need_ps) {
2228                 mutex_lock(&local->iflist_mtx);
2229                 ieee80211_recalc_ps(local, -1);
2230                 mutex_unlock(&local->iflist_mtx);
2231         }
2232
2233         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2234             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2235                                                         ETH_ALEN) == 0)) {
2236                 struct ieee80211_channel_sw_ie *sw_elem =
2237                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2238                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2239                                                  bss, rx_status->mactime);
2240         }
2241 }
2242
2243
2244 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2245                                          struct sk_buff *skb)
2246 {
2247         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2248         struct ieee80211_if_managed *ifmgd;
2249         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2250         size_t baselen, len = skb->len;
2251         struct ieee802_11_elems elems;
2252
2253         ifmgd = &sdata->u.mgd;
2254
2255         ASSERT_MGD_MTX(ifmgd);
2256
2257         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2258                 return; /* ignore ProbeResp to foreign address */
2259
2260         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2261         if (baselen > len)
2262                 return;
2263
2264         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2265                                 &elems);
2266
2267         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2268
2269         if (ifmgd->associated &&
2270             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2271                 ieee80211_reset_ap_probe(sdata);
2272
2273         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2274             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2275                 /* got probe response, continue with auth */
2276                 sdata_info(sdata, "direct probe responded\n");
2277                 ifmgd->auth_data->tries = 0;
2278                 ifmgd->auth_data->timeout = jiffies;
2279                 run_again(ifmgd, ifmgd->auth_data->timeout);
2280         }
2281 }
2282
2283 /*
2284  * This is the canonical list of information elements we care about,
2285  * the filter code also gives us all changes to the Microsoft OUI
2286  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2287  *
2288  * We implement beacon filtering in software since that means we can
2289  * avoid processing the frame here and in cfg80211, and userspace
2290  * will not be able to tell whether the hardware supports it or not.
2291  *
2292  * XXX: This list needs to be dynamic -- userspace needs to be able to
2293  *      add items it requires. It also needs to be able to tell us to
2294  *      look out for other vendor IEs.
2295  */
2296 static const u64 care_about_ies =
2297         (1ULL << WLAN_EID_COUNTRY) |
2298         (1ULL << WLAN_EID_ERP_INFO) |
2299         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2300         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2301         (1ULL << WLAN_EID_HT_CAPABILITY) |
2302         (1ULL << WLAN_EID_HT_OPERATION);
2303
2304 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2305                                      struct ieee80211_mgmt *mgmt,
2306                                      size_t len,
2307                                      struct ieee80211_rx_status *rx_status)
2308 {
2309         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2310         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2311         size_t baselen;
2312         struct ieee802_11_elems elems;
2313         struct ieee80211_local *local = sdata->local;
2314         u32 changed = 0;
2315         bool erp_valid, directed_tim = false;
2316         u8 erp_value = 0;
2317         u32 ncrc;
2318         u8 *bssid;
2319
2320         lockdep_assert_held(&ifmgd->mtx);
2321
2322         /* Process beacon from the current BSS */
2323         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2324         if (baselen > len)
2325                 return;
2326
2327         if (rx_status->freq != local->hw.conf.channel->center_freq)
2328                 return;
2329
2330         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2331             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2332                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2333                                        len - baselen, &elems);
2334
2335                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2336                                       false);
2337                 ifmgd->assoc_data->have_beacon = true;
2338                 ifmgd->assoc_data->sent_assoc = false;
2339                 /* continue assoc process */
2340                 ifmgd->assoc_data->timeout = jiffies;
2341                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2342                 return;
2343         }
2344
2345         if (!ifmgd->associated ||
2346             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2347                 return;
2348         bssid = ifmgd->associated->bssid;
2349
2350         /* Track average RSSI from the Beacon frames of the current AP */
2351         ifmgd->last_beacon_signal = rx_status->signal;
2352         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2353                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2354                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2355                 ifmgd->last_cqm_event_signal = 0;
2356                 ifmgd->count_beacon_signal = 1;
2357                 ifmgd->last_ave_beacon_signal = 0;
2358         } else {
2359                 ifmgd->ave_beacon_signal =
2360                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2361                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2362                          ifmgd->ave_beacon_signal) / 16;
2363                 ifmgd->count_beacon_signal++;
2364         }
2365
2366         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2367             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2368                 int sig = ifmgd->ave_beacon_signal;
2369                 int last_sig = ifmgd->last_ave_beacon_signal;
2370
2371                 /*
2372                  * if signal crosses either of the boundaries, invoke callback
2373                  * with appropriate parameters
2374                  */
2375                 if (sig > ifmgd->rssi_max_thold &&
2376                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2377                         ifmgd->last_ave_beacon_signal = sig;
2378                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2379                 } else if (sig < ifmgd->rssi_min_thold &&
2380                            (last_sig >= ifmgd->rssi_max_thold ||
2381                            last_sig == 0)) {
2382                         ifmgd->last_ave_beacon_signal = sig;
2383                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2384                 }
2385         }
2386
2387         if (bss_conf->cqm_rssi_thold &&
2388             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2389             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2390                 int sig = ifmgd->ave_beacon_signal / 16;
2391                 int last_event = ifmgd->last_cqm_event_signal;
2392                 int thold = bss_conf->cqm_rssi_thold;
2393                 int hyst = bss_conf->cqm_rssi_hyst;
2394                 if (sig < thold &&
2395                     (last_event == 0 || sig < last_event - hyst)) {
2396                         ifmgd->last_cqm_event_signal = sig;
2397                         ieee80211_cqm_rssi_notify(
2398                                 &sdata->vif,
2399                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2400                                 GFP_KERNEL);
2401                 } else if (sig > thold &&
2402                            (last_event == 0 || sig > last_event + hyst)) {
2403                         ifmgd->last_cqm_event_signal = sig;
2404                         ieee80211_cqm_rssi_notify(
2405                                 &sdata->vif,
2406                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2407                                 GFP_KERNEL);
2408                 }
2409         }
2410
2411         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2412                 mlme_dbg_ratelimited(sdata,
2413                                      "cancelling probereq poll due to a received beacon\n");
2414                 mutex_lock(&local->mtx);
2415                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2416                 ieee80211_run_deferred_scan(local);
2417                 mutex_unlock(&local->mtx);
2418
2419                 mutex_lock(&local->iflist_mtx);
2420                 ieee80211_recalc_ps(local, -1);
2421                 mutex_unlock(&local->iflist_mtx);
2422         }
2423
2424         /*
2425          * Push the beacon loss detection into the future since
2426          * we are processing a beacon from the AP just now.
2427          */
2428         ieee80211_sta_reset_beacon_monitor(sdata);
2429
2430         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2431         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2432                                           len - baselen, &elems,
2433                                           care_about_ies, ncrc);
2434
2435         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2436                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2437                                                    ifmgd->aid);
2438
2439         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2440                 if (directed_tim) {
2441                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2442                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2443                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2444                                         ieee80211_hw_config(local,
2445                                                             IEEE80211_CONF_CHANGE_PS);
2446                                 }
2447                                 ieee80211_send_nullfunc(local, sdata, 0);
2448                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2449                                 local->pspolling = true;
2450
2451                                 /*
2452                                  * Here is assumed that the driver will be
2453                                  * able to send ps-poll frame and receive a
2454                                  * response even though power save mode is
2455                                  * enabled, but some drivers might require
2456                                  * to disable power save here. This needs
2457                                  * to be investigated.
2458                                  */
2459                                 ieee80211_send_pspoll(local, sdata);
2460                         }
2461                 }
2462         }
2463
2464         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2465                 return;
2466         ifmgd->beacon_crc = ncrc;
2467         ifmgd->beacon_crc_valid = true;
2468
2469         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2470                               true);
2471
2472         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2473                                      elems.wmm_param_len))
2474                 changed |= BSS_CHANGED_QOS;
2475
2476         if (elems.erp_info && elems.erp_info_len >= 1) {
2477                 erp_valid = true;
2478                 erp_value = elems.erp_info[0];
2479         } else {
2480                 erp_valid = false;
2481         }
2482         changed |= ieee80211_handle_bss_capability(sdata,
2483                         le16_to_cpu(mgmt->u.beacon.capab_info),
2484                         erp_valid, erp_value);
2485
2486
2487         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2488             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2489                 struct ieee80211_supported_band *sband;
2490
2491                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2492
2493                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2494                                                   bssid, true);
2495         }
2496
2497         /* Note: country IE parsing is done for us by cfg80211 */
2498         if (elems.country_elem) {
2499                 /* TODO: IBSS also needs this */
2500                 if (elems.pwr_constr_elem)
2501                         ieee80211_handle_pwr_constr(sdata,
2502                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2503                                 elems.pwr_constr_elem,
2504                                 elems.pwr_constr_elem_len);
2505         }
2506
2507         ieee80211_bss_info_change_notify(sdata, changed);
2508 }
2509
2510 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2511                                   struct sk_buff *skb)
2512 {
2513         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2514         struct ieee80211_rx_status *rx_status;
2515         struct ieee80211_mgmt *mgmt;
2516         struct cfg80211_bss *bss = NULL;
2517         enum rx_mgmt_action rma = RX_MGMT_NONE;
2518         u16 fc;
2519
2520         rx_status = (struct ieee80211_rx_status *) skb->cb;
2521         mgmt = (struct ieee80211_mgmt *) skb->data;
2522         fc = le16_to_cpu(mgmt->frame_control);
2523
2524         mutex_lock(&ifmgd->mtx);
2525
2526         switch (fc & IEEE80211_FCTL_STYPE) {
2527         case IEEE80211_STYPE_BEACON:
2528                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2529                 break;
2530         case IEEE80211_STYPE_PROBE_RESP:
2531                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2532                 break;
2533         case IEEE80211_STYPE_AUTH:
2534                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2535                 break;
2536         case IEEE80211_STYPE_DEAUTH:
2537                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2538                 break;
2539         case IEEE80211_STYPE_DISASSOC:
2540                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2541                 break;
2542         case IEEE80211_STYPE_ASSOC_RESP:
2543         case IEEE80211_STYPE_REASSOC_RESP:
2544                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2545                 break;
2546         case IEEE80211_STYPE_ACTION:
2547                 switch (mgmt->u.action.category) {
2548                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2549                         ieee80211_sta_process_chanswitch(sdata,
2550                                         &mgmt->u.action.u.chan_switch.sw_elem,
2551                                         (void *)ifmgd->associated->priv,
2552                                         rx_status->mactime);
2553                         break;
2554                 }
2555         }
2556         mutex_unlock(&ifmgd->mtx);
2557
2558         switch (rma) {
2559         case RX_MGMT_NONE:
2560                 /* no action */
2561                 break;
2562         case RX_MGMT_CFG80211_DEAUTH:
2563                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2564                 break;
2565         case RX_MGMT_CFG80211_DISASSOC:
2566                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2567                 break;
2568         case RX_MGMT_CFG80211_RX_AUTH:
2569                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2570                 break;
2571         case RX_MGMT_CFG80211_RX_ASSOC:
2572                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2573                 break;
2574         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2575                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2576                 break;
2577         default:
2578                 WARN(1, "unexpected: %d", rma);
2579         }
2580 }
2581
2582 static void ieee80211_sta_timer(unsigned long data)
2583 {
2584         struct ieee80211_sub_if_data *sdata =
2585                 (struct ieee80211_sub_if_data *) data;
2586         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2587         struct ieee80211_local *local = sdata->local;
2588
2589         if (local->quiescing) {
2590                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2591                 return;
2592         }
2593
2594         ieee80211_queue_work(&local->hw, &sdata->work);
2595 }
2596
2597 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2598                                           u8 *bssid, u8 reason)
2599 {
2600         struct ieee80211_local *local = sdata->local;
2601         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2602         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2603
2604         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2605                                false, frame_buf);
2606         mutex_unlock(&ifmgd->mtx);
2607
2608         /*
2609          * must be outside lock due to cfg80211,
2610          * but that's not a problem.
2611          */
2612         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2613
2614         mutex_lock(&local->mtx);
2615         ieee80211_recalc_idle(local);
2616         mutex_unlock(&local->mtx);
2617
2618         mutex_lock(&ifmgd->mtx);
2619 }
2620
2621 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2622 {
2623         struct ieee80211_local *local = sdata->local;
2624         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2625         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2626
2627         lockdep_assert_held(&ifmgd->mtx);
2628
2629         if (WARN_ON_ONCE(!auth_data))
2630                 return -EINVAL;
2631
2632         auth_data->tries++;
2633
2634         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2635                 sdata_info(sdata, "authentication with %pM timed out\n",
2636                            auth_data->bss->bssid);
2637
2638                 /*
2639                  * Most likely AP is not in the range so remove the
2640                  * bss struct for that AP.
2641                  */
2642                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2643
2644                 return -ETIMEDOUT;
2645         }
2646
2647         drv_mgd_prepare_tx(local, sdata);
2648
2649         if (auth_data->bss->proberesp_ies) {
2650                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2651                            auth_data->bss->bssid, auth_data->tries,
2652                            IEEE80211_AUTH_MAX_TRIES);
2653
2654                 auth_data->expected_transaction = 2;
2655                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2656                                     auth_data->ie, auth_data->ie_len,
2657                                     auth_data->bss->bssid,
2658                                     auth_data->bss->bssid, NULL, 0, 0);
2659         } else {
2660                 const u8 *ssidie;
2661
2662                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2663                            auth_data->bss->bssid, auth_data->tries,
2664                            IEEE80211_AUTH_MAX_TRIES);
2665
2666                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2667                 if (!ssidie)
2668                         return -EINVAL;
2669                 /*
2670                  * Direct probe is sent to broadcast address as some APs
2671                  * will not answer to direct packet in unassociated state.
2672                  */
2673                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2674                                          NULL, 0, (u32) -1, true, false);
2675         }
2676
2677         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2678         run_again(ifmgd, auth_data->timeout);
2679
2680         return 0;
2681 }
2682
2683 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2684 {
2685         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2686         struct ieee80211_local *local = sdata->local;
2687
2688         lockdep_assert_held(&sdata->u.mgd.mtx);
2689
2690         assoc_data->tries++;
2691         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2692                 sdata_info(sdata, "association with %pM timed out\n",
2693                            assoc_data->bss->bssid);
2694
2695                 /*
2696                  * Most likely AP is not in the range so remove the
2697                  * bss struct for that AP.
2698                  */
2699                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2700
2701                 return -ETIMEDOUT;
2702         }
2703
2704         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2705                    assoc_data->bss->bssid, assoc_data->tries,
2706                    IEEE80211_ASSOC_MAX_TRIES);
2707         ieee80211_send_assoc(sdata);
2708
2709         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2710         run_again(&sdata->u.mgd, assoc_data->timeout);
2711
2712         return 0;
2713 }
2714
2715 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2716 {
2717         struct ieee80211_local *local = sdata->local;
2718         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2719
2720         mutex_lock(&ifmgd->mtx);
2721
2722         if (ifmgd->auth_data &&
2723             time_after(jiffies, ifmgd->auth_data->timeout)) {
2724                 if (ifmgd->auth_data->done) {
2725                         /*
2726                          * ok ... we waited for assoc but userspace didn't,
2727                          * so let's just kill the auth data
2728                          */
2729                         ieee80211_destroy_auth_data(sdata, false);
2730                 } else if (ieee80211_probe_auth(sdata)) {
2731                         u8 bssid[ETH_ALEN];
2732
2733                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2734
2735                         ieee80211_destroy_auth_data(sdata, false);
2736
2737                         mutex_unlock(&ifmgd->mtx);
2738                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2739                         mutex_lock(&ifmgd->mtx);
2740                 }
2741         } else if (ifmgd->auth_data)
2742                 run_again(ifmgd, ifmgd->auth_data->timeout);
2743
2744         if (ifmgd->assoc_data &&
2745             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2746                 if (!ifmgd->assoc_data->have_beacon ||
2747                     ieee80211_do_assoc(sdata)) {
2748                         u8 bssid[ETH_ALEN];
2749
2750                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2751
2752                         ieee80211_destroy_assoc_data(sdata, false);
2753
2754                         mutex_unlock(&ifmgd->mtx);
2755                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2756                         mutex_lock(&ifmgd->mtx);
2757                 }
2758         } else if (ifmgd->assoc_data)
2759                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2760
2761         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2762                             IEEE80211_STA_CONNECTION_POLL) &&
2763             ifmgd->associated) {
2764                 u8 bssid[ETH_ALEN];
2765                 int max_tries;
2766
2767                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2768
2769                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2770                         max_tries = max_nullfunc_tries;
2771                 else
2772                         max_tries = max_probe_tries;
2773
2774                 /* ACK received for nullfunc probing frame */
2775                 if (!ifmgd->probe_send_count)
2776                         ieee80211_reset_ap_probe(sdata);
2777                 else if (ifmgd->nullfunc_failed) {
2778                         if (ifmgd->probe_send_count < max_tries) {
2779                                 mlme_dbg(sdata,
2780                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2781                                          bssid, ifmgd->probe_send_count,
2782                                          max_tries);
2783                                 ieee80211_mgd_probe_ap_send(sdata);
2784                         } else {
2785                                 mlme_dbg(sdata,
2786                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2787                                          bssid);
2788                                 ieee80211_sta_connection_lost(sdata, bssid,
2789                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2790                         }
2791                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2792                         run_again(ifmgd, ifmgd->probe_timeout);
2793                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2794                         mlme_dbg(sdata,
2795                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2796                                  bssid, probe_wait_ms);
2797                         ieee80211_sta_connection_lost(sdata, bssid,
2798                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2799                 } else if (ifmgd->probe_send_count < max_tries) {
2800                         mlme_dbg(sdata,
2801                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2802                                  bssid, probe_wait_ms,
2803                                  ifmgd->probe_send_count, max_tries);
2804                         ieee80211_mgd_probe_ap_send(sdata);
2805                 } else {
2806                         /*
2807                          * We actually lost the connection ... or did we?
2808                          * Let's make sure!
2809                          */
2810                         wiphy_debug(local->hw.wiphy,
2811                                     "%s: No probe response from AP %pM"
2812                                     " after %dms, disconnecting.\n",
2813                                     sdata->name,
2814                                     bssid, probe_wait_ms);
2815
2816                         ieee80211_sta_connection_lost(sdata, bssid,
2817                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2818                 }
2819         }
2820
2821         mutex_unlock(&ifmgd->mtx);
2822
2823         mutex_lock(&local->mtx);
2824         ieee80211_recalc_idle(local);
2825         mutex_unlock(&local->mtx);
2826 }
2827
2828 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2829 {
2830         struct ieee80211_sub_if_data *sdata =
2831                 (struct ieee80211_sub_if_data *) data;
2832         struct ieee80211_local *local = sdata->local;
2833
2834         if (local->quiescing)
2835                 return;
2836
2837         ieee80211_queue_work(&sdata->local->hw,
2838                              &sdata->u.mgd.beacon_connection_loss_work);
2839 }
2840
2841 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2842 {
2843         struct ieee80211_sub_if_data *sdata =
2844                 (struct ieee80211_sub_if_data *) data;
2845         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2846         struct ieee80211_local *local = sdata->local;
2847
2848         if (local->quiescing)
2849                 return;
2850
2851         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2852 }
2853
2854 static void ieee80211_sta_monitor_work(struct work_struct *work)
2855 {
2856         struct ieee80211_sub_if_data *sdata =
2857                 container_of(work, struct ieee80211_sub_if_data,
2858                              u.mgd.monitor_work);
2859
2860         ieee80211_mgd_probe_ap(sdata, false);
2861 }
2862
2863 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2864 {
2865         u32 flags;
2866
2867         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2868                 __ieee80211_stop_poll(sdata);
2869
2870                 /* let's probe the connection once */
2871                 flags = sdata->local->hw.flags;
2872                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2873                         ieee80211_queue_work(&sdata->local->hw,
2874                                              &sdata->u.mgd.monitor_work);
2875                 /* and do all the other regular work too */
2876                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2877         }
2878 }
2879
2880 #ifdef CONFIG_PM
2881 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2882 {
2883         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2884
2885         /*
2886          * we need to use atomic bitops for the running bits
2887          * only because both timers might fire at the same
2888          * time -- the code here is properly synchronised.
2889          */
2890
2891         cancel_work_sync(&ifmgd->request_smps_work);
2892
2893         cancel_work_sync(&ifmgd->monitor_work);
2894         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2895         if (del_timer_sync(&ifmgd->timer))
2896                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2897
2898         cancel_work_sync(&ifmgd->chswitch_work);
2899         if (del_timer_sync(&ifmgd->chswitch_timer))
2900                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2901
2902         /* these will just be re-established on connection */
2903         del_timer_sync(&ifmgd->conn_mon_timer);
2904         del_timer_sync(&ifmgd->bcn_mon_timer);
2905 }
2906
2907 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2908 {
2909         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2910
2911         if (!ifmgd->associated)
2912                 return;
2913
2914         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2915                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2916                 mutex_lock(&ifmgd->mtx);
2917                 if (ifmgd->associated) {
2918                         mlme_dbg(sdata,
2919                                  "driver requested disconnect after resume\n");
2920                         ieee80211_sta_connection_lost(sdata,
2921                                 ifmgd->associated->bssid,
2922                                 WLAN_REASON_UNSPECIFIED);
2923                         mutex_unlock(&ifmgd->mtx);
2924                         return;
2925                 }
2926                 mutex_unlock(&ifmgd->mtx);
2927         }
2928
2929         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2930                 add_timer(&ifmgd->timer);
2931         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2932                 add_timer(&ifmgd->chswitch_timer);
2933         ieee80211_sta_reset_beacon_monitor(sdata);
2934
2935         mutex_lock(&sdata->local->mtx);
2936         ieee80211_restart_sta_timer(sdata);
2937         mutex_unlock(&sdata->local->mtx);
2938 }
2939 #endif
2940
2941 /* interface setup */
2942 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2943 {
2944         struct ieee80211_if_managed *ifmgd;
2945
2946         ifmgd = &sdata->u.mgd;
2947         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2948         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2949         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2950                   ieee80211_beacon_connection_loss_work);
2951         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2952         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2953                     (unsigned long) sdata);
2954         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2955                     (unsigned long) sdata);
2956         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2957                     (unsigned long) sdata);
2958         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2959                     (unsigned long) sdata);
2960
2961         ifmgd->flags = 0;
2962         ifmgd->powersave = sdata->wdev.ps;
2963         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
2964         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
2965
2966         mutex_init(&ifmgd->mtx);
2967
2968         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2969                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2970         else
2971                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2972 }
2973
2974 /* scan finished notification */
2975 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2976 {
2977         struct ieee80211_sub_if_data *sdata;
2978
2979         /* Restart STA timers */
2980         rcu_read_lock();
2981         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2982                 ieee80211_restart_sta_timer(sdata);
2983         rcu_read_unlock();
2984 }
2985
2986 int ieee80211_max_network_latency(struct notifier_block *nb,
2987                                   unsigned long data, void *dummy)
2988 {
2989         s32 latency_usec = (s32) data;
2990         struct ieee80211_local *local =
2991                 container_of(nb, struct ieee80211_local,
2992                              network_latency_notifier);
2993
2994         mutex_lock(&local->iflist_mtx);
2995         ieee80211_recalc_ps(local, latency_usec);
2996         mutex_unlock(&local->iflist_mtx);
2997
2998         return 0;
2999 }
3000
3001 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3002                                      struct cfg80211_bss *cbss, bool assoc)
3003 {
3004         struct ieee80211_local *local = sdata->local;
3005         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3006         struct ieee80211_bss *bss = (void *)cbss->priv;
3007         struct sta_info *sta = NULL;
3008         bool have_sta = false;
3009         int err;
3010         int ht_cfreq;
3011         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3012         const u8 *ht_oper_ie;
3013         const struct ieee80211_ht_operation *ht_oper = NULL;
3014         struct ieee80211_supported_band *sband;
3015
3016         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3017                 return -EINVAL;
3018
3019         if (assoc) {
3020                 rcu_read_lock();
3021                 have_sta = sta_info_get(sdata, cbss->bssid);
3022                 rcu_read_unlock();
3023         }
3024
3025         if (!have_sta) {
3026                 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3027                 if (!sta)
3028                         return -ENOMEM;
3029         }
3030
3031         mutex_lock(&local->mtx);
3032         ieee80211_recalc_idle(sdata->local);
3033         mutex_unlock(&local->mtx);
3034
3035         /* switch to the right channel */
3036         sband = local->hw.wiphy->bands[cbss->channel->band];
3037
3038         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3039
3040         if (sband->ht_cap.ht_supported) {
3041                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3042                                               cbss->information_elements,
3043                                               cbss->len_information_elements);
3044                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3045                         ht_oper = (void *)(ht_oper_ie + 2);
3046         }
3047
3048         if (ht_oper) {
3049                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3050                                                           cbss->channel->band);
3051                 /* check that channel matches the right operating channel */
3052                 if (cbss->channel->center_freq != ht_cfreq) {
3053                         /*
3054                          * It's possible that some APs are confused here;
3055                          * Netgear WNDR3700 sometimes reports 4 higher than
3056                          * the actual channel in association responses, but
3057                          * since we look at probe response/beacon data here
3058                          * it should be OK.
3059                          */
3060                         sdata_info(sdata,
3061                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3062                                    cbss->channel->center_freq,
3063                                    ht_cfreq, ht_oper->primary_chan,
3064                                    cbss->channel->band);
3065                         ht_oper = NULL;
3066                 }
3067         }
3068
3069         if (ht_oper) {
3070                 channel_type = NL80211_CHAN_HT20;
3071
3072                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3073                         switch (ht_oper->ht_param &
3074                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3075                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3076                                 channel_type = NL80211_CHAN_HT40PLUS;
3077                                 break;
3078                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3079                                 channel_type = NL80211_CHAN_HT40MINUS;
3080                                 break;
3081                         }
3082                 }
3083         }
3084
3085         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3086                 /* can only fail due to HT40+/- mismatch */
3087                 channel_type = NL80211_CHAN_HT20;
3088                 sdata_info(sdata,
3089                            "disabling 40 MHz due to multi-vif mismatch\n");
3090                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3091                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3092                                                     channel_type));
3093         }
3094
3095         local->oper_channel = cbss->channel;
3096         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3097
3098         if (sta) {
3099                 u32 rates = 0, basic_rates = 0;
3100                 bool have_higher_than_11mbit;
3101                 int min_rate = INT_MAX, min_rate_index = -1;
3102
3103                 ieee80211_get_rates(sband, bss->supp_rates,
3104                                     bss->supp_rates_len,
3105                                     &rates, &basic_rates,
3106                                     &have_higher_than_11mbit,
3107                                     &min_rate, &min_rate_index);
3108
3109                 /*
3110                  * This used to be a workaround for basic rates missing
3111                  * in the association response frame. Now that we no
3112                  * longer use the basic rates from there, it probably
3113                  * doesn't happen any more, but keep the workaround so
3114                  * in case some *other* APs are buggy in different ways
3115                  * we can connect -- with a warning.
3116                  */
3117                 if (!basic_rates && min_rate_index >= 0) {
3118                         sdata_info(sdata,
3119                                    "No basic rates, using min rate instead\n");
3120                         basic_rates = BIT(min_rate_index);
3121                 }
3122
3123                 sta->sta.supp_rates[cbss->channel->band] = rates;
3124                 sdata->vif.bss_conf.basic_rates = basic_rates;
3125
3126                 /* cf. IEEE 802.11 9.2.12 */
3127                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3128                     have_higher_than_11mbit)
3129                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3130                 else
3131                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3132
3133                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3134
3135                 /* set timing information */
3136                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3137                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3138                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3139
3140                 /* tell driver about BSSID, basic rates and timing */
3141                 ieee80211_bss_info_change_notify(sdata,
3142                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3143                         BSS_CHANGED_BEACON_INT);
3144
3145                 if (assoc)
3146                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3147
3148                 err = sta_info_insert(sta);
3149                 sta = NULL;
3150                 if (err) {
3151                         sdata_info(sdata,
3152                                    "failed to insert STA entry for the AP (error %d)\n",
3153                                    err);
3154                         return err;
3155                 }
3156         } else
3157                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3158
3159         return 0;
3160 }
3161
3162 /* config hooks */
3163 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3164                        struct cfg80211_auth_request *req)
3165 {
3166         struct ieee80211_local *local = sdata->local;
3167         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3168         struct ieee80211_mgd_auth_data *auth_data;
3169         u16 auth_alg;
3170         int err;
3171
3172         /* prepare auth data structure */
3173
3174         switch (req->auth_type) {
3175         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3176                 auth_alg = WLAN_AUTH_OPEN;
3177                 break;
3178         case NL80211_AUTHTYPE_SHARED_KEY:
3179                 if (IS_ERR(local->wep_tx_tfm))
3180                         return -EOPNOTSUPP;
3181                 auth_alg = WLAN_AUTH_SHARED_KEY;
3182                 break;
3183         case NL80211_AUTHTYPE_FT:
3184                 auth_alg = WLAN_AUTH_FT;
3185                 break;
3186         case NL80211_AUTHTYPE_NETWORK_EAP:
3187                 auth_alg = WLAN_AUTH_LEAP;
3188                 break;
3189         default:
3190                 return -EOPNOTSUPP;
3191         }
3192
3193         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3194         if (!auth_data)
3195                 return -ENOMEM;
3196
3197         auth_data->bss = req->bss;
3198
3199         if (req->ie && req->ie_len) {
3200                 memcpy(auth_data->ie, req->ie, req->ie_len);
3201                 auth_data->ie_len = req->ie_len;
3202         }
3203
3204         if (req->key && req->key_len) {
3205                 auth_data->key_len = req->key_len;
3206                 auth_data->key_idx = req->key_idx;
3207                 memcpy(auth_data->key, req->key, req->key_len);
3208         }
3209
3210         auth_data->algorithm = auth_alg;
3211
3212         /* try to authenticate/probe */
3213
3214         mutex_lock(&ifmgd->mtx);
3215
3216         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3217             ifmgd->assoc_data) {
3218                 err = -EBUSY;
3219                 goto err_free;
3220         }
3221
3222         if (ifmgd->auth_data)
3223                 ieee80211_destroy_auth_data(sdata, false);
3224
3225         /* prep auth_data so we don't go into idle on disassoc */
3226         ifmgd->auth_data = auth_data;
3227
3228         if (ifmgd->associated)
3229                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3230
3231         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3232
3233         err = ieee80211_prep_connection(sdata, req->bss, false);
3234         if (err)
3235                 goto err_clear;
3236
3237         err = ieee80211_probe_auth(sdata);
3238         if (err) {
3239                 sta_info_destroy_addr(sdata, req->bss->bssid);
3240                 goto err_clear;
3241         }
3242
3243         /* hold our own reference */
3244         cfg80211_ref_bss(auth_data->bss);
3245         err = 0;
3246         goto out_unlock;
3247
3248  err_clear:
3249         ifmgd->auth_data = NULL;
3250  err_free:
3251         kfree(auth_data);
3252  out_unlock:
3253         mutex_unlock(&ifmgd->mtx);
3254
3255         return err;
3256 }
3257
3258 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3259                         struct cfg80211_assoc_request *req)
3260 {
3261         struct ieee80211_local *local = sdata->local;
3262         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3263         struct ieee80211_bss *bss = (void *)req->bss->priv;
3264         struct ieee80211_mgd_assoc_data *assoc_data;
3265         struct ieee80211_supported_band *sband;
3266         const u8 *ssidie, *ht_ie;
3267         int i, err;
3268
3269         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3270         if (!ssidie)
3271                 return -EINVAL;
3272
3273         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3274         if (!assoc_data)
3275                 return -ENOMEM;
3276
3277         mutex_lock(&ifmgd->mtx);
3278
3279         if (ifmgd->associated)
3280                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3281
3282         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3283                 err = -EBUSY;
3284                 goto err_free;
3285         }
3286
3287         if (ifmgd->assoc_data) {
3288                 err = -EBUSY;
3289                 goto err_free;
3290         }
3291
3292         if (ifmgd->auth_data) {
3293                 bool match;
3294
3295                 /* keep sta info, bssid if matching */
3296                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3297                 ieee80211_destroy_auth_data(sdata, match);
3298         }
3299
3300         /* prepare assoc data */
3301
3302         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3303         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3304
3305         ifmgd->beacon_crc_valid = false;
3306
3307         /*
3308          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3309          * We still associate in non-HT mode (11a/b/g) if any one of these
3310          * ciphers is configured as pairwise.
3311          * We can set this to true for non-11n hardware, that'll be checked
3312          * separately along with the peer capabilities.
3313          */
3314         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3315                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3316                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3317                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3318                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3319                         netdev_info(sdata->dev,
3320                                     "disabling HT due to WEP/TKIP use\n");
3321                 }
3322         }
3323
3324         if (req->flags & ASSOC_REQ_DISABLE_HT)
3325                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3326
3327         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3328         sband = local->hw.wiphy->bands[req->bss->channel->band];
3329         if (!sband->ht_cap.ht_supported ||
3330             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3331                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3332                 netdev_info(sdata->dev,
3333                             "disabling HT as WMM/QoS is not supported\n");
3334         }
3335
3336         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3337         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3338                sizeof(ifmgd->ht_capa_mask));
3339
3340         if (req->ie && req->ie_len) {
3341                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3342                 assoc_data->ie_len = req->ie_len;
3343         }
3344
3345         assoc_data->bss = req->bss;
3346
3347         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3348                 if (ifmgd->powersave)
3349                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3350                 else
3351                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3352         } else
3353                 ifmgd->ap_smps = ifmgd->req_smps;
3354
3355         assoc_data->capability = req->bss->capability;
3356         assoc_data->wmm = bss->wmm_used &&
3357                           (local->hw.queues >= IEEE80211_NUM_ACS);
3358         assoc_data->supp_rates = bss->supp_rates;
3359         assoc_data->supp_rates_len = bss->supp_rates_len;
3360
3361         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3362         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3363                 assoc_data->ap_ht_param =
3364                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3365         else
3366                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3367
3368         if (bss->wmm_used && bss->uapsd_supported &&
3369             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3370                 assoc_data->uapsd = true;
3371                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3372         } else {
3373                 assoc_data->uapsd = false;
3374                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3375         }
3376
3377         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3378         assoc_data->ssid_len = ssidie[1];
3379
3380         if (req->prev_bssid)
3381                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3382
3383         if (req->use_mfp) {
3384                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3385                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3386         } else {
3387                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3388                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3389         }
3390
3391         if (req->crypto.control_port)
3392                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3393         else
3394                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3395
3396         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3397         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3398
3399         /* kick off associate process */
3400
3401         ifmgd->assoc_data = assoc_data;
3402
3403         err = ieee80211_prep_connection(sdata, req->bss, true);
3404         if (err)
3405                 goto err_clear;
3406
3407         if (!bss->dtim_period &&
3408             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3409                 /*
3410                  * Wait up to one beacon interval ...
3411                  * should this be more if we miss one?
3412                  */
3413                 sdata_info(sdata, "waiting for beacon from %pM\n",
3414                            ifmgd->bssid);
3415                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3416         } else {
3417                 assoc_data->have_beacon = true;
3418                 assoc_data->sent_assoc = false;
3419                 assoc_data->timeout = jiffies;
3420         }
3421         run_again(ifmgd, assoc_data->timeout);
3422
3423         if (bss->corrupt_data) {
3424                 char *corrupt_type = "data";
3425                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3426                         if (bss->corrupt_data &
3427                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3428                                 corrupt_type = "beacon and probe response";
3429                         else
3430                                 corrupt_type = "beacon";
3431                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3432                         corrupt_type = "probe response";
3433                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3434                            corrupt_type);
3435         }
3436
3437         err = 0;
3438         goto out;
3439  err_clear:
3440         ifmgd->assoc_data = NULL;
3441  err_free:
3442         kfree(assoc_data);
3443  out:
3444         mutex_unlock(&ifmgd->mtx);
3445
3446         return err;
3447 }
3448
3449 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3450                          struct cfg80211_deauth_request *req)
3451 {
3452         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3453         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3454
3455         mutex_lock(&ifmgd->mtx);
3456
3457         if (ifmgd->auth_data) {
3458                 ieee80211_destroy_auth_data(sdata, false);
3459                 mutex_unlock(&ifmgd->mtx);
3460                 return 0;
3461         }
3462
3463         sdata_info(sdata,
3464                    "deauthenticating from %pM by local choice (reason=%d)\n",
3465                    req->bssid, req->reason_code);
3466
3467         if (ifmgd->associated &&
3468             ether_addr_equal(ifmgd->associated->bssid, req->bssid))
3469                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3470                                        req->reason_code, true, frame_buf);
3471         else
3472                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3473                                                IEEE80211_STYPE_DEAUTH,
3474                                                req->reason_code, true,
3475                                                frame_buf);
3476         mutex_unlock(&ifmgd->mtx);
3477
3478         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3479
3480         mutex_lock(&sdata->local->mtx);
3481         ieee80211_recalc_idle(sdata->local);
3482         mutex_unlock(&sdata->local->mtx);
3483
3484         return 0;
3485 }
3486
3487 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3488                            struct cfg80211_disassoc_request *req)
3489 {
3490         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3491         u8 bssid[ETH_ALEN];
3492         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3493
3494         mutex_lock(&ifmgd->mtx);
3495
3496         /*
3497          * cfg80211 should catch this ... but it's racy since
3498          * we can receive a disassoc frame, process it, hand it
3499          * to cfg80211 while that's in a locked section already
3500          * trying to tell us that the user wants to disconnect.
3501          */
3502         if (ifmgd->associated != req->bss) {
3503                 mutex_unlock(&ifmgd->mtx);
3504                 return -ENOLINK;
3505         }
3506
3507         sdata_info(sdata,
3508                    "disassociating from %pM by local choice (reason=%d)\n",
3509                    req->bss->bssid, req->reason_code);
3510
3511         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3512         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3513                                req->reason_code, !req->local_state_change,
3514                                frame_buf);
3515         mutex_unlock(&ifmgd->mtx);
3516
3517         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3518
3519         mutex_lock(&sdata->local->mtx);
3520         ieee80211_recalc_idle(sdata->local);
3521         mutex_unlock(&sdata->local->mtx);
3522
3523         return 0;
3524 }
3525
3526 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3527 {
3528         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3529
3530         mutex_lock(&ifmgd->mtx);
3531         if (ifmgd->assoc_data)
3532                 ieee80211_destroy_assoc_data(sdata, false);
3533         if (ifmgd->auth_data)
3534                 ieee80211_destroy_auth_data(sdata, false);
3535         del_timer_sync(&ifmgd->timer);
3536         mutex_unlock(&ifmgd->mtx);
3537 }
3538
3539 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3540                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3541                                gfp_t gfp)
3542 {
3543         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3544
3545         trace_api_cqm_rssi_notify(sdata, rssi_event);
3546
3547         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3548 }
3549 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);