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         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1364         if (tx)
1365                 drv_flush(local, false);
1366
1367         /* deauthenticate/disassociate now */
1368         if (tx || frame_buf)
1369                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1370                                                reason, tx, frame_buf);
1371
1372         /* flush out frame */
1373         if (tx)
1374                 drv_flush(local, false);
1375
1376         /* clear bssid only after building the needed mgmt frames */
1377         memset(ifmgd->bssid, 0, ETH_ALEN);
1378
1379         /* remove AP and TDLS peers */
1380         sta_info_flush(local, sdata);
1381
1382         /* finally reset all BSS / config parameters */
1383         changed |= ieee80211_reset_erp_info(sdata);
1384
1385         ieee80211_led_assoc(local, 0);
1386         changed |= BSS_CHANGED_ASSOC;
1387         sdata->vif.bss_conf.assoc = false;
1388
1389         /* on the next assoc, re-program HT parameters */
1390         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1391         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1392
1393         local->power_constr_level = 0;
1394
1395         del_timer_sync(&local->dynamic_ps_timer);
1396         cancel_work_sync(&local->dynamic_ps_enable_work);
1397
1398         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1399                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1400                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1401         }
1402         local->ps_sdata = NULL;
1403
1404         /* Disable ARP filtering */
1405         if (sdata->vif.bss_conf.arp_filter_enabled) {
1406                 sdata->vif.bss_conf.arp_filter_enabled = false;
1407                 changed |= BSS_CHANGED_ARP_FILTER;
1408         }
1409
1410         sdata->vif.bss_conf.qos = false;
1411         changed |= BSS_CHANGED_QOS;
1412
1413         /* The BSSID (not really interesting) and HT changed */
1414         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1415         ieee80211_bss_info_change_notify(sdata, changed);
1416
1417         /* channel(_type) changes are handled by ieee80211_hw_config */
1418         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1419         ieee80211_hw_config(local, 0);
1420
1421         /* disassociated - set to defaults now */
1422         ieee80211_set_wmm_default(sdata, false);
1423
1424         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1425         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1426         del_timer_sync(&sdata->u.mgd.timer);
1427         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1428 }
1429
1430 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1431                              struct ieee80211_hdr *hdr)
1432 {
1433         /*
1434          * We can postpone the mgd.timer whenever receiving unicast frames
1435          * from AP because we know that the connection is working both ways
1436          * at that time. But multicast frames (and hence also beacons) must
1437          * be ignored here, because we need to trigger the timer during
1438          * data idle periods for sending the periodic probe request to the
1439          * AP we're connected to.
1440          */
1441         if (is_multicast_ether_addr(hdr->addr1))
1442                 return;
1443
1444         ieee80211_sta_reset_conn_monitor(sdata);
1445 }
1446
1447 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1448 {
1449         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1450         struct ieee80211_local *local = sdata->local;
1451
1452         mutex_lock(&local->mtx);
1453         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1454                               IEEE80211_STA_CONNECTION_POLL))) {
1455                 mutex_unlock(&local->mtx);
1456                 return;
1457         }
1458
1459         __ieee80211_stop_poll(sdata);
1460
1461         mutex_lock(&local->iflist_mtx);
1462         ieee80211_recalc_ps(local, -1);
1463         mutex_unlock(&local->iflist_mtx);
1464
1465         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1466                 goto out;
1467
1468         /*
1469          * We've received a probe response, but are not sure whether
1470          * we have or will be receiving any beacons or data, so let's
1471          * schedule the timers again, just in case.
1472          */
1473         ieee80211_sta_reset_beacon_monitor(sdata);
1474
1475         mod_timer(&ifmgd->conn_mon_timer,
1476                   round_jiffies_up(jiffies +
1477                                    IEEE80211_CONNECTION_IDLE_TIME));
1478 out:
1479         mutex_unlock(&local->mtx);
1480 }
1481
1482 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1483                              struct ieee80211_hdr *hdr, bool ack)
1484 {
1485         if (!ieee80211_is_data(hdr->frame_control))
1486             return;
1487
1488         if (ack)
1489                 ieee80211_sta_reset_conn_monitor(sdata);
1490
1491         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1492             sdata->u.mgd.probe_send_count > 0) {
1493                 if (ack)
1494                         sdata->u.mgd.probe_send_count = 0;
1495                 else
1496                         sdata->u.mgd.nullfunc_failed = true;
1497                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1498         }
1499 }
1500
1501 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1502 {
1503         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1504         const u8 *ssid;
1505         u8 *dst = ifmgd->associated->bssid;
1506         u8 unicast_limit = max(1, max_probe_tries - 3);
1507
1508         /*
1509          * Try sending broadcast probe requests for the last three
1510          * probe requests after the first ones failed since some
1511          * buggy APs only support broadcast probe requests.
1512          */
1513         if (ifmgd->probe_send_count >= unicast_limit)
1514                 dst = NULL;
1515
1516         /*
1517          * When the hardware reports an accurate Tx ACK status, it's
1518          * better to send a nullfunc frame instead of a probe request,
1519          * as it will kick us off the AP quickly if we aren't associated
1520          * anymore. The timeout will be reset if the frame is ACKed by
1521          * the AP.
1522          */
1523         ifmgd->probe_send_count++;
1524
1525         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1526                 ifmgd->nullfunc_failed = false;
1527                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1528         } else {
1529                 int ssid_len;
1530
1531                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1532                 if (WARN_ON_ONCE(ssid == NULL))
1533                         ssid_len = 0;
1534                 else
1535                         ssid_len = ssid[1];
1536
1537                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1538                                          0, (u32) -1, true, false);
1539         }
1540
1541         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1542         run_again(ifmgd, ifmgd->probe_timeout);
1543         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1544                 drv_flush(sdata->local, false);
1545 }
1546
1547 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1548                                    bool beacon)
1549 {
1550         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1551         bool already = false;
1552
1553         if (!ieee80211_sdata_running(sdata))
1554                 return;
1555
1556         mutex_lock(&ifmgd->mtx);
1557
1558         if (!ifmgd->associated)
1559                 goto out;
1560
1561         mutex_lock(&sdata->local->mtx);
1562
1563         if (sdata->local->tmp_channel || sdata->local->scanning) {
1564                 mutex_unlock(&sdata->local->mtx);
1565                 goto out;
1566         }
1567
1568         if (beacon)
1569                 mlme_dbg_ratelimited(sdata,
1570                                      "detected beacon loss from AP - sending probe request\n");
1571
1572         ieee80211_cqm_rssi_notify(&sdata->vif,
1573                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1574
1575         /*
1576          * The driver/our work has already reported this event or the
1577          * connection monitoring has kicked in and we have already sent
1578          * a probe request. Or maybe the AP died and the driver keeps
1579          * reporting until we disassociate...
1580          *
1581          * In either case we have to ignore the current call to this
1582          * function (except for setting the correct probe reason bit)
1583          * because otherwise we would reset the timer every time and
1584          * never check whether we received a probe response!
1585          */
1586         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1587                             IEEE80211_STA_CONNECTION_POLL))
1588                 already = true;
1589
1590         if (beacon)
1591                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1592         else
1593                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1594
1595         mutex_unlock(&sdata->local->mtx);
1596
1597         if (already)
1598                 goto out;
1599
1600         mutex_lock(&sdata->local->iflist_mtx);
1601         ieee80211_recalc_ps(sdata->local, -1);
1602         mutex_unlock(&sdata->local->iflist_mtx);
1603
1604         ifmgd->probe_send_count = 0;
1605         ieee80211_mgd_probe_ap_send(sdata);
1606  out:
1607         mutex_unlock(&ifmgd->mtx);
1608 }
1609
1610 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1611                                           struct ieee80211_vif *vif)
1612 {
1613         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1614         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1615         struct cfg80211_bss *cbss;
1616         struct sk_buff *skb;
1617         const u8 *ssid;
1618         int ssid_len;
1619
1620         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1621                 return NULL;
1622
1623         ASSERT_MGD_MTX(ifmgd);
1624
1625         if (ifmgd->associated)
1626                 cbss = ifmgd->associated;
1627         else if (ifmgd->auth_data)
1628                 cbss = ifmgd->auth_data->bss;
1629         else if (ifmgd->assoc_data)
1630                 cbss = ifmgd->assoc_data->bss;
1631         else
1632                 return NULL;
1633
1634         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1635         if (WARN_ON_ONCE(ssid == NULL))
1636                 ssid_len = 0;
1637         else
1638                 ssid_len = ssid[1];
1639
1640         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1641                                         (u32) -1, ssid + 2, ssid_len,
1642                                         NULL, 0, true);
1643
1644         return skb;
1645 }
1646 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1647
1648 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1649 {
1650         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1651         struct ieee80211_local *local = sdata->local;
1652         u8 bssid[ETH_ALEN];
1653         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1654
1655         mutex_lock(&ifmgd->mtx);
1656         if (!ifmgd->associated) {
1657                 mutex_unlock(&ifmgd->mtx);
1658                 return;
1659         }
1660
1661         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1662
1663         sdata_info(sdata, "Connection to AP %pM lost\n", bssid);
1664
1665         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1666                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1667                                false, frame_buf);
1668         mutex_unlock(&ifmgd->mtx);
1669
1670         /*
1671          * must be outside lock due to cfg80211,
1672          * but that's not a problem.
1673          */
1674         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1675
1676         mutex_lock(&local->mtx);
1677         ieee80211_recalc_idle(local);
1678         mutex_unlock(&local->mtx);
1679 }
1680
1681 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1682 {
1683         struct ieee80211_sub_if_data *sdata =
1684                 container_of(work, struct ieee80211_sub_if_data,
1685                              u.mgd.beacon_connection_loss_work);
1686         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1687         struct sta_info *sta;
1688
1689         if (ifmgd->associated) {
1690                 rcu_read_lock();
1691                 sta = sta_info_get(sdata, ifmgd->bssid);
1692                 if (sta)
1693                         sta->beacon_loss_count++;
1694                 rcu_read_unlock();
1695         }
1696
1697         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1698                 __ieee80211_connection_loss(sdata);
1699         else
1700                 ieee80211_mgd_probe_ap(sdata, true);
1701 }
1702
1703 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1704 {
1705         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1706         struct ieee80211_hw *hw = &sdata->local->hw;
1707
1708         trace_api_beacon_loss(sdata);
1709
1710         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1711         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1712 }
1713 EXPORT_SYMBOL(ieee80211_beacon_loss);
1714
1715 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1716 {
1717         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1718         struct ieee80211_hw *hw = &sdata->local->hw;
1719
1720         trace_api_connection_loss(sdata);
1721
1722         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1723         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1724 }
1725 EXPORT_SYMBOL(ieee80211_connection_loss);
1726
1727
1728 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1729                                         bool assoc)
1730 {
1731         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1732
1733         lockdep_assert_held(&sdata->u.mgd.mtx);
1734
1735         if (!assoc) {
1736                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1737
1738                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1739                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1740         }
1741
1742         cfg80211_put_bss(auth_data->bss);
1743         kfree(auth_data);
1744         sdata->u.mgd.auth_data = NULL;
1745 }
1746
1747 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1748                                      struct ieee80211_mgmt *mgmt, size_t len)
1749 {
1750         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1751         u8 *pos;
1752         struct ieee802_11_elems elems;
1753
1754         pos = mgmt->u.auth.variable;
1755         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1756         if (!elems.challenge)
1757                 return;
1758         auth_data->expected_transaction = 4;
1759         drv_mgd_prepare_tx(sdata->local, sdata);
1760         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1761                             elems.challenge - 2, elems.challenge_len + 2,
1762                             auth_data->bss->bssid, auth_data->bss->bssid,
1763                             auth_data->key, auth_data->key_len,
1764                             auth_data->key_idx);
1765 }
1766
1767 static enum rx_mgmt_action __must_check
1768 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1769                        struct ieee80211_mgmt *mgmt, size_t len)
1770 {
1771         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1772         u8 bssid[ETH_ALEN];
1773         u16 auth_alg, auth_transaction, status_code;
1774         struct sta_info *sta;
1775
1776         lockdep_assert_held(&ifmgd->mtx);
1777
1778         if (len < 24 + 6)
1779                 return RX_MGMT_NONE;
1780
1781         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1782                 return RX_MGMT_NONE;
1783
1784         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1785
1786         if (!ether_addr_equal(bssid, mgmt->bssid))
1787                 return RX_MGMT_NONE;
1788
1789         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1790         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1791         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1792
1793         if (auth_alg != ifmgd->auth_data->algorithm ||
1794             auth_transaction != ifmgd->auth_data->expected_transaction)
1795                 return RX_MGMT_NONE;
1796
1797         if (status_code != WLAN_STATUS_SUCCESS) {
1798                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1799                            mgmt->sa, status_code);
1800                 ieee80211_destroy_auth_data(sdata, false);
1801                 return RX_MGMT_CFG80211_RX_AUTH;
1802         }
1803
1804         switch (ifmgd->auth_data->algorithm) {
1805         case WLAN_AUTH_OPEN:
1806         case WLAN_AUTH_LEAP:
1807         case WLAN_AUTH_FT:
1808                 break;
1809         case WLAN_AUTH_SHARED_KEY:
1810                 if (ifmgd->auth_data->expected_transaction != 4) {
1811                         ieee80211_auth_challenge(sdata, mgmt, len);
1812                         /* need another frame */
1813                         return RX_MGMT_NONE;
1814                 }
1815                 break;
1816         default:
1817                 WARN_ONCE(1, "invalid auth alg %d",
1818                           ifmgd->auth_data->algorithm);
1819                 return RX_MGMT_NONE;
1820         }
1821
1822         sdata_info(sdata, "authenticated\n");
1823         ifmgd->auth_data->done = true;
1824         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1825         run_again(ifmgd, ifmgd->auth_data->timeout);
1826
1827         /* move station state to auth */
1828         mutex_lock(&sdata->local->sta_mtx);
1829         sta = sta_info_get(sdata, bssid);
1830         if (!sta) {
1831                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1832                 goto out_err;
1833         }
1834         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1835                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1836                 goto out_err;
1837         }
1838         mutex_unlock(&sdata->local->sta_mtx);
1839
1840         return RX_MGMT_CFG80211_RX_AUTH;
1841  out_err:
1842         mutex_unlock(&sdata->local->sta_mtx);
1843         /* ignore frame -- wait for timeout */
1844         return RX_MGMT_NONE;
1845 }
1846
1847
1848 static enum rx_mgmt_action __must_check
1849 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1850                          struct ieee80211_mgmt *mgmt, size_t len)
1851 {
1852         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1853         const u8 *bssid = NULL;
1854         u16 reason_code;
1855
1856         lockdep_assert_held(&ifmgd->mtx);
1857
1858         if (len < 24 + 2)
1859                 return RX_MGMT_NONE;
1860
1861         if (!ifmgd->associated ||
1862             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1863                 return RX_MGMT_NONE;
1864
1865         bssid = ifmgd->associated->bssid;
1866
1867         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1868
1869         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1870                    bssid, reason_code);
1871
1872         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1873
1874         mutex_lock(&sdata->local->mtx);
1875         ieee80211_recalc_idle(sdata->local);
1876         mutex_unlock(&sdata->local->mtx);
1877
1878         return RX_MGMT_CFG80211_DEAUTH;
1879 }
1880
1881
1882 static enum rx_mgmt_action __must_check
1883 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1884                            struct ieee80211_mgmt *mgmt, size_t len)
1885 {
1886         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1887         u16 reason_code;
1888
1889         lockdep_assert_held(&ifmgd->mtx);
1890
1891         if (len < 24 + 2)
1892                 return RX_MGMT_NONE;
1893
1894         if (!ifmgd->associated ||
1895             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1896                 return RX_MGMT_NONE;
1897
1898         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1899
1900         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1901                    mgmt->sa, reason_code);
1902
1903         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1904
1905         mutex_lock(&sdata->local->mtx);
1906         ieee80211_recalc_idle(sdata->local);
1907         mutex_unlock(&sdata->local->mtx);
1908
1909         return RX_MGMT_CFG80211_DISASSOC;
1910 }
1911
1912 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1913                                 u8 *supp_rates, unsigned int supp_rates_len,
1914                                 u32 *rates, u32 *basic_rates,
1915                                 bool *have_higher_than_11mbit,
1916                                 int *min_rate, int *min_rate_index)
1917 {
1918         int i, j;
1919
1920         for (i = 0; i < supp_rates_len; i++) {
1921                 int rate = (supp_rates[i] & 0x7f) * 5;
1922                 bool is_basic = !!(supp_rates[i] & 0x80);
1923
1924                 if (rate > 110)
1925                         *have_higher_than_11mbit = true;
1926
1927                 /*
1928                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1929                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1930                  *
1931                  * Note: Even through the membership selector and the basic
1932                  *       rate flag share the same bit, they are not exactly
1933                  *       the same.
1934                  */
1935                 if (!!(supp_rates[i] & 0x80) &&
1936                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1937                         continue;
1938
1939                 for (j = 0; j < sband->n_bitrates; j++) {
1940                         if (sband->bitrates[j].bitrate == rate) {
1941                                 *rates |= BIT(j);
1942                                 if (is_basic)
1943                                         *basic_rates |= BIT(j);
1944                                 if (rate < *min_rate) {
1945                                         *min_rate = rate;
1946                                         *min_rate_index = j;
1947                                 }
1948                                 break;
1949                         }
1950                 }
1951         }
1952 }
1953
1954 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1955                                          bool assoc)
1956 {
1957         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1958
1959         lockdep_assert_held(&sdata->u.mgd.mtx);
1960
1961         if (!assoc) {
1962                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1963
1964                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1965                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1966         }
1967
1968         kfree(assoc_data);
1969         sdata->u.mgd.assoc_data = NULL;
1970 }
1971
1972 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
1973                                     struct cfg80211_bss *cbss,
1974                                     struct ieee80211_mgmt *mgmt, size_t len)
1975 {
1976         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1977         struct ieee80211_local *local = sdata->local;
1978         struct ieee80211_supported_band *sband;
1979         struct sta_info *sta;
1980         u8 *pos;
1981         u16 capab_info, aid;
1982         struct ieee802_11_elems elems;
1983         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1984         u32 changed = 0;
1985         int err;
1986
1987         /* AssocResp and ReassocResp have identical structure */
1988
1989         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1990         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1991
1992         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1993                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
1994                            aid);
1995         aid &= ~(BIT(15) | BIT(14));
1996
1997         ifmgd->broken_ap = false;
1998
1999         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2000                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2001                            aid);
2002                 aid = 0;
2003                 ifmgd->broken_ap = true;
2004         }
2005
2006         pos = mgmt->u.assoc_resp.variable;
2007         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2008
2009         if (!elems.supp_rates) {
2010                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2011                 return false;
2012         }
2013
2014         ifmgd->aid = aid;
2015
2016         mutex_lock(&sdata->local->sta_mtx);
2017         /*
2018          * station info was already allocated and inserted before
2019          * the association and should be available to us
2020          */
2021         sta = sta_info_get(sdata, cbss->bssid);
2022         if (WARN_ON(!sta)) {
2023                 mutex_unlock(&sdata->local->sta_mtx);
2024                 return false;
2025         }
2026
2027         sband = local->hw.wiphy->bands[local->oper_channel->band];
2028
2029         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2030                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2031                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2032
2033         sta->supports_40mhz =
2034                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2035
2036         rate_control_rate_init(sta);
2037
2038         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2039                 set_sta_flag(sta, WLAN_STA_MFP);
2040
2041         if (elems.wmm_param)
2042                 set_sta_flag(sta, WLAN_STA_WME);
2043
2044         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2045         if (!err)
2046                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2047         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2048                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2049         if (err) {
2050                 sdata_info(sdata,
2051                            "failed to move station %pM to desired state\n",
2052                            sta->sta.addr);
2053                 WARN_ON(__sta_info_destroy(sta));
2054                 mutex_unlock(&sdata->local->sta_mtx);
2055                 return false;
2056         }
2057
2058         mutex_unlock(&sdata->local->sta_mtx);
2059
2060         /*
2061          * Always handle WMM once after association regardless
2062          * of the first value the AP uses. Setting -1 here has
2063          * that effect because the AP values is an unsigned
2064          * 4-bit value.
2065          */
2066         ifmgd->wmm_last_param_set = -1;
2067
2068         if (elems.wmm_param)
2069                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2070                                          elems.wmm_param_len);
2071         else
2072                 ieee80211_set_wmm_default(sdata, false);
2073         changed |= BSS_CHANGED_QOS;
2074
2075         if (elems.ht_operation && elems.wmm_param &&
2076             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2077                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2078                                                   cbss->bssid, false);
2079
2080         /* set AID and assoc capability,
2081          * ieee80211_set_associated() will tell the driver */
2082         bss_conf->aid = aid;
2083         bss_conf->assoc_capability = capab_info;
2084         ieee80211_set_associated(sdata, cbss, changed);
2085
2086         /*
2087          * If we're using 4-addr mode, let the AP know that we're
2088          * doing so, so that it can create the STA VLAN on its side
2089          */
2090         if (ifmgd->use_4addr)
2091                 ieee80211_send_4addr_nullfunc(local, sdata);
2092
2093         /*
2094          * Start timer to probe the connection to the AP now.
2095          * Also start the timer that will detect beacon loss.
2096          */
2097         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2098         ieee80211_sta_reset_beacon_monitor(sdata);
2099
2100         return true;
2101 }
2102
2103 static enum rx_mgmt_action __must_check
2104 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2105                              struct ieee80211_mgmt *mgmt, size_t len,
2106                              struct cfg80211_bss **bss)
2107 {
2108         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2109         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2110         u16 capab_info, status_code, aid;
2111         struct ieee802_11_elems elems;
2112         u8 *pos;
2113         bool reassoc;
2114
2115         lockdep_assert_held(&ifmgd->mtx);
2116
2117         if (!assoc_data)
2118                 return RX_MGMT_NONE;
2119         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2120                 return RX_MGMT_NONE;
2121
2122         /*
2123          * AssocResp and ReassocResp have identical structure, so process both
2124          * of them in this function.
2125          */
2126
2127         if (len < 24 + 6)
2128                 return RX_MGMT_NONE;
2129
2130         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2131         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2132         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2133         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2134
2135         sdata_info(sdata,
2136                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2137                    reassoc ? "Rea" : "A", mgmt->sa,
2138                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2139
2140         pos = mgmt->u.assoc_resp.variable;
2141         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2142
2143         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2144             elems.timeout_int && elems.timeout_int_len == 5 &&
2145             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2146                 u32 tu, ms;
2147                 tu = get_unaligned_le32(elems.timeout_int + 1);
2148                 ms = tu * 1024 / 1000;
2149                 sdata_info(sdata,
2150                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2151                            mgmt->sa, tu, ms);
2152                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2153                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2154                         run_again(ifmgd, assoc_data->timeout);
2155                 return RX_MGMT_NONE;
2156         }
2157
2158         *bss = assoc_data->bss;
2159
2160         if (status_code != WLAN_STATUS_SUCCESS) {
2161                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2162                            mgmt->sa, status_code);
2163                 ieee80211_destroy_assoc_data(sdata, false);
2164         } else {
2165                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2166                         /* oops -- internal error -- send timeout for now */
2167                         ieee80211_destroy_assoc_data(sdata, false);
2168                         cfg80211_put_bss(*bss);
2169                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2170                 }
2171                 sdata_info(sdata, "associated\n");
2172
2173                 /*
2174                  * destroy assoc_data afterwards, as otherwise an idle
2175                  * recalc after assoc_data is NULL but before associated
2176                  * is set can cause the interface to go idle
2177                  */
2178                 ieee80211_destroy_assoc_data(sdata, true);
2179         }
2180
2181         return RX_MGMT_CFG80211_RX_ASSOC;
2182 }
2183 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2184                                   struct ieee80211_mgmt *mgmt,
2185                                   size_t len,
2186                                   struct ieee80211_rx_status *rx_status,
2187                                   struct ieee802_11_elems *elems,
2188                                   bool beacon)
2189 {
2190         struct ieee80211_local *local = sdata->local;
2191         int freq;
2192         struct ieee80211_bss *bss;
2193         struct ieee80211_channel *channel;
2194         bool need_ps = false;
2195
2196         if (sdata->u.mgd.associated &&
2197             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2198                 bss = (void *)sdata->u.mgd.associated->priv;
2199                 /* not previously set so we may need to recalc */
2200                 need_ps = !bss->dtim_period;
2201         }
2202
2203         if (elems->ds_params && elems->ds_params_len == 1)
2204                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2205                                                       rx_status->band);
2206         else
2207                 freq = rx_status->freq;
2208
2209         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2210
2211         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2212                 return;
2213
2214         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2215                                         channel, beacon);
2216         if (bss)
2217                 ieee80211_rx_bss_put(local, bss);
2218
2219         if (!sdata->u.mgd.associated)
2220                 return;
2221
2222         if (need_ps) {
2223                 mutex_lock(&local->iflist_mtx);
2224                 ieee80211_recalc_ps(local, -1);
2225                 mutex_unlock(&local->iflist_mtx);
2226         }
2227
2228         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2229             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2230                                                         ETH_ALEN) == 0)) {
2231                 struct ieee80211_channel_sw_ie *sw_elem =
2232                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2233                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2234                                                  bss, rx_status->mactime);
2235         }
2236 }
2237
2238
2239 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2240                                          struct sk_buff *skb)
2241 {
2242         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2243         struct ieee80211_if_managed *ifmgd;
2244         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2245         size_t baselen, len = skb->len;
2246         struct ieee802_11_elems elems;
2247
2248         ifmgd = &sdata->u.mgd;
2249
2250         ASSERT_MGD_MTX(ifmgd);
2251
2252         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2253                 return; /* ignore ProbeResp to foreign address */
2254
2255         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2256         if (baselen > len)
2257                 return;
2258
2259         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2260                                 &elems);
2261
2262         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2263
2264         if (ifmgd->associated &&
2265             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2266                 ieee80211_reset_ap_probe(sdata);
2267
2268         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2269             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2270                 /* got probe response, continue with auth */
2271                 sdata_info(sdata, "direct probe responded\n");
2272                 ifmgd->auth_data->tries = 0;
2273                 ifmgd->auth_data->timeout = jiffies;
2274                 run_again(ifmgd, ifmgd->auth_data->timeout);
2275         }
2276 }
2277
2278 /*
2279  * This is the canonical list of information elements we care about,
2280  * the filter code also gives us all changes to the Microsoft OUI
2281  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2282  *
2283  * We implement beacon filtering in software since that means we can
2284  * avoid processing the frame here and in cfg80211, and userspace
2285  * will not be able to tell whether the hardware supports it or not.
2286  *
2287  * XXX: This list needs to be dynamic -- userspace needs to be able to
2288  *      add items it requires. It also needs to be able to tell us to
2289  *      look out for other vendor IEs.
2290  */
2291 static const u64 care_about_ies =
2292         (1ULL << WLAN_EID_COUNTRY) |
2293         (1ULL << WLAN_EID_ERP_INFO) |
2294         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2295         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2296         (1ULL << WLAN_EID_HT_CAPABILITY) |
2297         (1ULL << WLAN_EID_HT_OPERATION);
2298
2299 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2300                                      struct ieee80211_mgmt *mgmt,
2301                                      size_t len,
2302                                      struct ieee80211_rx_status *rx_status)
2303 {
2304         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2305         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2306         size_t baselen;
2307         struct ieee802_11_elems elems;
2308         struct ieee80211_local *local = sdata->local;
2309         u32 changed = 0;
2310         bool erp_valid, directed_tim = false;
2311         u8 erp_value = 0;
2312         u32 ncrc;
2313         u8 *bssid;
2314
2315         lockdep_assert_held(&ifmgd->mtx);
2316
2317         /* Process beacon from the current BSS */
2318         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2319         if (baselen > len)
2320                 return;
2321
2322         if (rx_status->freq != local->hw.conf.channel->center_freq)
2323                 return;
2324
2325         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2326             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2327                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2328                                        len - baselen, &elems);
2329
2330                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2331                                       false);
2332                 ifmgd->assoc_data->have_beacon = true;
2333                 ifmgd->assoc_data->sent_assoc = false;
2334                 /* continue assoc process */
2335                 ifmgd->assoc_data->timeout = jiffies;
2336                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2337                 return;
2338         }
2339
2340         if (!ifmgd->associated ||
2341             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2342                 return;
2343         bssid = ifmgd->associated->bssid;
2344
2345         /* Track average RSSI from the Beacon frames of the current AP */
2346         ifmgd->last_beacon_signal = rx_status->signal;
2347         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2348                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2349                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2350                 ifmgd->last_cqm_event_signal = 0;
2351                 ifmgd->count_beacon_signal = 1;
2352                 ifmgd->last_ave_beacon_signal = 0;
2353         } else {
2354                 ifmgd->ave_beacon_signal =
2355                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2356                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2357                          ifmgd->ave_beacon_signal) / 16;
2358                 ifmgd->count_beacon_signal++;
2359         }
2360
2361         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2362             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2363                 int sig = ifmgd->ave_beacon_signal;
2364                 int last_sig = ifmgd->last_ave_beacon_signal;
2365
2366                 /*
2367                  * if signal crosses either of the boundaries, invoke callback
2368                  * with appropriate parameters
2369                  */
2370                 if (sig > ifmgd->rssi_max_thold &&
2371                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2372                         ifmgd->last_ave_beacon_signal = sig;
2373                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2374                 } else if (sig < ifmgd->rssi_min_thold &&
2375                            (last_sig >= ifmgd->rssi_max_thold ||
2376                            last_sig == 0)) {
2377                         ifmgd->last_ave_beacon_signal = sig;
2378                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2379                 }
2380         }
2381
2382         if (bss_conf->cqm_rssi_thold &&
2383             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2384             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2385                 int sig = ifmgd->ave_beacon_signal / 16;
2386                 int last_event = ifmgd->last_cqm_event_signal;
2387                 int thold = bss_conf->cqm_rssi_thold;
2388                 int hyst = bss_conf->cqm_rssi_hyst;
2389                 if (sig < thold &&
2390                     (last_event == 0 || sig < last_event - hyst)) {
2391                         ifmgd->last_cqm_event_signal = sig;
2392                         ieee80211_cqm_rssi_notify(
2393                                 &sdata->vif,
2394                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2395                                 GFP_KERNEL);
2396                 } else if (sig > thold &&
2397                            (last_event == 0 || sig > last_event + hyst)) {
2398                         ifmgd->last_cqm_event_signal = sig;
2399                         ieee80211_cqm_rssi_notify(
2400                                 &sdata->vif,
2401                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2402                                 GFP_KERNEL);
2403                 }
2404         }
2405
2406         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2407                 mlme_dbg_ratelimited(sdata,
2408                                      "cancelling probereq poll due to a received beacon\n");
2409                 mutex_lock(&local->mtx);
2410                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2411                 ieee80211_run_deferred_scan(local);
2412                 mutex_unlock(&local->mtx);
2413
2414                 mutex_lock(&local->iflist_mtx);
2415                 ieee80211_recalc_ps(local, -1);
2416                 mutex_unlock(&local->iflist_mtx);
2417         }
2418
2419         /*
2420          * Push the beacon loss detection into the future since
2421          * we are processing a beacon from the AP just now.
2422          */
2423         ieee80211_sta_reset_beacon_monitor(sdata);
2424
2425         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2426         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2427                                           len - baselen, &elems,
2428                                           care_about_ies, ncrc);
2429
2430         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2431                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2432                                                    ifmgd->aid);
2433
2434         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2435                 if (directed_tim) {
2436                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2437                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2438                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2439                                         ieee80211_hw_config(local,
2440                                                             IEEE80211_CONF_CHANGE_PS);
2441                                 }
2442                                 ieee80211_send_nullfunc(local, sdata, 0);
2443                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2444                                 local->pspolling = true;
2445
2446                                 /*
2447                                  * Here is assumed that the driver will be
2448                                  * able to send ps-poll frame and receive a
2449                                  * response even though power save mode is
2450                                  * enabled, but some drivers might require
2451                                  * to disable power save here. This needs
2452                                  * to be investigated.
2453                                  */
2454                                 ieee80211_send_pspoll(local, sdata);
2455                         }
2456                 }
2457         }
2458
2459         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2460                 return;
2461         ifmgd->beacon_crc = ncrc;
2462         ifmgd->beacon_crc_valid = true;
2463
2464         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2465                               true);
2466
2467         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2468                                      elems.wmm_param_len))
2469                 changed |= BSS_CHANGED_QOS;
2470
2471         if (elems.erp_info && elems.erp_info_len >= 1) {
2472                 erp_valid = true;
2473                 erp_value = elems.erp_info[0];
2474         } else {
2475                 erp_valid = false;
2476         }
2477         changed |= ieee80211_handle_bss_capability(sdata,
2478                         le16_to_cpu(mgmt->u.beacon.capab_info),
2479                         erp_valid, erp_value);
2480
2481
2482         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2483             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2484                 struct ieee80211_supported_band *sband;
2485
2486                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2487
2488                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2489                                                   bssid, true);
2490         }
2491
2492         /* Note: country IE parsing is done for us by cfg80211 */
2493         if (elems.country_elem) {
2494                 /* TODO: IBSS also needs this */
2495                 if (elems.pwr_constr_elem)
2496                         ieee80211_handle_pwr_constr(sdata,
2497                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2498                                 elems.pwr_constr_elem,
2499                                 elems.pwr_constr_elem_len);
2500         }
2501
2502         ieee80211_bss_info_change_notify(sdata, changed);
2503 }
2504
2505 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2506                                   struct sk_buff *skb)
2507 {
2508         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2509         struct ieee80211_rx_status *rx_status;
2510         struct ieee80211_mgmt *mgmt;
2511         struct cfg80211_bss *bss = NULL;
2512         enum rx_mgmt_action rma = RX_MGMT_NONE;
2513         u16 fc;
2514
2515         rx_status = (struct ieee80211_rx_status *) skb->cb;
2516         mgmt = (struct ieee80211_mgmt *) skb->data;
2517         fc = le16_to_cpu(mgmt->frame_control);
2518
2519         mutex_lock(&ifmgd->mtx);
2520
2521         switch (fc & IEEE80211_FCTL_STYPE) {
2522         case IEEE80211_STYPE_BEACON:
2523                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2524                 break;
2525         case IEEE80211_STYPE_PROBE_RESP:
2526                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2527                 break;
2528         case IEEE80211_STYPE_AUTH:
2529                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2530                 break;
2531         case IEEE80211_STYPE_DEAUTH:
2532                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2533                 break;
2534         case IEEE80211_STYPE_DISASSOC:
2535                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2536                 break;
2537         case IEEE80211_STYPE_ASSOC_RESP:
2538         case IEEE80211_STYPE_REASSOC_RESP:
2539                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2540                 break;
2541         case IEEE80211_STYPE_ACTION:
2542                 switch (mgmt->u.action.category) {
2543                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2544                         ieee80211_sta_process_chanswitch(sdata,
2545                                         &mgmt->u.action.u.chan_switch.sw_elem,
2546                                         (void *)ifmgd->associated->priv,
2547                                         rx_status->mactime);
2548                         break;
2549                 }
2550         }
2551         mutex_unlock(&ifmgd->mtx);
2552
2553         switch (rma) {
2554         case RX_MGMT_NONE:
2555                 /* no action */
2556                 break;
2557         case RX_MGMT_CFG80211_DEAUTH:
2558                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2559                 break;
2560         case RX_MGMT_CFG80211_DISASSOC:
2561                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2562                 break;
2563         case RX_MGMT_CFG80211_RX_AUTH:
2564                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2565                 break;
2566         case RX_MGMT_CFG80211_RX_ASSOC:
2567                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2568                 break;
2569         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2570                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2571                 break;
2572         default:
2573                 WARN(1, "unexpected: %d", rma);
2574         }
2575 }
2576
2577 static void ieee80211_sta_timer(unsigned long data)
2578 {
2579         struct ieee80211_sub_if_data *sdata =
2580                 (struct ieee80211_sub_if_data *) data;
2581         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2582         struct ieee80211_local *local = sdata->local;
2583
2584         if (local->quiescing) {
2585                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2586                 return;
2587         }
2588
2589         ieee80211_queue_work(&local->hw, &sdata->work);
2590 }
2591
2592 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2593                                           u8 *bssid, u8 reason)
2594 {
2595         struct ieee80211_local *local = sdata->local;
2596         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2597         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2598
2599         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2600                                false, frame_buf);
2601         mutex_unlock(&ifmgd->mtx);
2602
2603         /*
2604          * must be outside lock due to cfg80211,
2605          * but that's not a problem.
2606          */
2607         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2608
2609         mutex_lock(&local->mtx);
2610         ieee80211_recalc_idle(local);
2611         mutex_unlock(&local->mtx);
2612
2613         mutex_lock(&ifmgd->mtx);
2614 }
2615
2616 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2617 {
2618         struct ieee80211_local *local = sdata->local;
2619         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2620         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2621
2622         lockdep_assert_held(&ifmgd->mtx);
2623
2624         if (WARN_ON_ONCE(!auth_data))
2625                 return -EINVAL;
2626
2627         auth_data->tries++;
2628
2629         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2630                 sdata_info(sdata, "authentication with %pM timed out\n",
2631                            auth_data->bss->bssid);
2632
2633                 /*
2634                  * Most likely AP is not in the range so remove the
2635                  * bss struct for that AP.
2636                  */
2637                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2638
2639                 return -ETIMEDOUT;
2640         }
2641
2642         drv_mgd_prepare_tx(local, sdata);
2643
2644         if (auth_data->bss->proberesp_ies) {
2645                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2646                            auth_data->bss->bssid, auth_data->tries,
2647                            IEEE80211_AUTH_MAX_TRIES);
2648
2649                 auth_data->expected_transaction = 2;
2650                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2651                                     auth_data->ie, auth_data->ie_len,
2652                                     auth_data->bss->bssid,
2653                                     auth_data->bss->bssid, NULL, 0, 0);
2654         } else {
2655                 const u8 *ssidie;
2656
2657                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2658                            auth_data->bss->bssid, auth_data->tries,
2659                            IEEE80211_AUTH_MAX_TRIES);
2660
2661                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2662                 if (!ssidie)
2663                         return -EINVAL;
2664                 /*
2665                  * Direct probe is sent to broadcast address as some APs
2666                  * will not answer to direct packet in unassociated state.
2667                  */
2668                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2669                                          NULL, 0, (u32) -1, true, false);
2670         }
2671
2672         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2673         run_again(ifmgd, auth_data->timeout);
2674
2675         return 0;
2676 }
2677
2678 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2679 {
2680         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2681         struct ieee80211_local *local = sdata->local;
2682
2683         lockdep_assert_held(&sdata->u.mgd.mtx);
2684
2685         assoc_data->tries++;
2686         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2687                 sdata_info(sdata, "association with %pM timed out\n",
2688                            assoc_data->bss->bssid);
2689
2690                 /*
2691                  * Most likely AP is not in the range so remove the
2692                  * bss struct for that AP.
2693                  */
2694                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2695
2696                 return -ETIMEDOUT;
2697         }
2698
2699         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2700                    assoc_data->bss->bssid, assoc_data->tries,
2701                    IEEE80211_ASSOC_MAX_TRIES);
2702         ieee80211_send_assoc(sdata);
2703
2704         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2705         run_again(&sdata->u.mgd, assoc_data->timeout);
2706
2707         return 0;
2708 }
2709
2710 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2711 {
2712         struct ieee80211_local *local = sdata->local;
2713         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2714
2715         mutex_lock(&ifmgd->mtx);
2716
2717         if (ifmgd->auth_data &&
2718             time_after(jiffies, ifmgd->auth_data->timeout)) {
2719                 if (ifmgd->auth_data->done) {
2720                         /*
2721                          * ok ... we waited for assoc but userspace didn't,
2722                          * so let's just kill the auth data
2723                          */
2724                         ieee80211_destroy_auth_data(sdata, false);
2725                 } else if (ieee80211_probe_auth(sdata)) {
2726                         u8 bssid[ETH_ALEN];
2727
2728                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2729
2730                         ieee80211_destroy_auth_data(sdata, false);
2731
2732                         mutex_unlock(&ifmgd->mtx);
2733                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2734                         mutex_lock(&ifmgd->mtx);
2735                 }
2736         } else if (ifmgd->auth_data)
2737                 run_again(ifmgd, ifmgd->auth_data->timeout);
2738
2739         if (ifmgd->assoc_data &&
2740             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2741                 if (!ifmgd->assoc_data->have_beacon ||
2742                     ieee80211_do_assoc(sdata)) {
2743                         u8 bssid[ETH_ALEN];
2744
2745                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2746
2747                         ieee80211_destroy_assoc_data(sdata, false);
2748
2749                         mutex_unlock(&ifmgd->mtx);
2750                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2751                         mutex_lock(&ifmgd->mtx);
2752                 }
2753         } else if (ifmgd->assoc_data)
2754                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2755
2756         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2757                             IEEE80211_STA_CONNECTION_POLL) &&
2758             ifmgd->associated) {
2759                 u8 bssid[ETH_ALEN];
2760                 int max_tries;
2761
2762                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2763
2764                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2765                         max_tries = max_nullfunc_tries;
2766                 else
2767                         max_tries = max_probe_tries;
2768
2769                 /* ACK received for nullfunc probing frame */
2770                 if (!ifmgd->probe_send_count)
2771                         ieee80211_reset_ap_probe(sdata);
2772                 else if (ifmgd->nullfunc_failed) {
2773                         if (ifmgd->probe_send_count < max_tries) {
2774                                 mlme_dbg(sdata,
2775                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2776                                          bssid, ifmgd->probe_send_count,
2777                                          max_tries);
2778                                 ieee80211_mgd_probe_ap_send(sdata);
2779                         } else {
2780                                 mlme_dbg(sdata,
2781                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2782                                          bssid);
2783                                 ieee80211_sta_connection_lost(sdata, bssid,
2784                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2785                         }
2786                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2787                         run_again(ifmgd, ifmgd->probe_timeout);
2788                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2789                         mlme_dbg(sdata,
2790                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2791                                  bssid, probe_wait_ms);
2792                         ieee80211_sta_connection_lost(sdata, bssid,
2793                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2794                 } else if (ifmgd->probe_send_count < max_tries) {
2795                         mlme_dbg(sdata,
2796                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2797                                  bssid, probe_wait_ms,
2798                                  ifmgd->probe_send_count, max_tries);
2799                         ieee80211_mgd_probe_ap_send(sdata);
2800                 } else {
2801                         /*
2802                          * We actually lost the connection ... or did we?
2803                          * Let's make sure!
2804                          */
2805                         wiphy_debug(local->hw.wiphy,
2806                                     "%s: No probe response from AP %pM"
2807                                     " after %dms, disconnecting.\n",
2808                                     sdata->name,
2809                                     bssid, probe_wait_ms);
2810
2811                         ieee80211_sta_connection_lost(sdata, bssid,
2812                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2813                 }
2814         }
2815
2816         mutex_unlock(&ifmgd->mtx);
2817
2818         mutex_lock(&local->mtx);
2819         ieee80211_recalc_idle(local);
2820         mutex_unlock(&local->mtx);
2821 }
2822
2823 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2824 {
2825         struct ieee80211_sub_if_data *sdata =
2826                 (struct ieee80211_sub_if_data *) data;
2827         struct ieee80211_local *local = sdata->local;
2828
2829         if (local->quiescing)
2830                 return;
2831
2832         ieee80211_queue_work(&sdata->local->hw,
2833                              &sdata->u.mgd.beacon_connection_loss_work);
2834 }
2835
2836 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2837 {
2838         struct ieee80211_sub_if_data *sdata =
2839                 (struct ieee80211_sub_if_data *) data;
2840         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2841         struct ieee80211_local *local = sdata->local;
2842
2843         if (local->quiescing)
2844                 return;
2845
2846         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2847 }
2848
2849 static void ieee80211_sta_monitor_work(struct work_struct *work)
2850 {
2851         struct ieee80211_sub_if_data *sdata =
2852                 container_of(work, struct ieee80211_sub_if_data,
2853                              u.mgd.monitor_work);
2854
2855         ieee80211_mgd_probe_ap(sdata, false);
2856 }
2857
2858 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2859 {
2860         u32 flags;
2861
2862         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2863                 __ieee80211_stop_poll(sdata);
2864
2865                 /* let's probe the connection once */
2866                 flags = sdata->local->hw.flags;
2867                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2868                         ieee80211_queue_work(&sdata->local->hw,
2869                                              &sdata->u.mgd.monitor_work);
2870                 /* and do all the other regular work too */
2871                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2872         }
2873 }
2874
2875 #ifdef CONFIG_PM
2876 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2877 {
2878         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2879
2880         /*
2881          * we need to use atomic bitops for the running bits
2882          * only because both timers might fire at the same
2883          * time -- the code here is properly synchronised.
2884          */
2885
2886         cancel_work_sync(&ifmgd->request_smps_work);
2887
2888         cancel_work_sync(&ifmgd->monitor_work);
2889         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2890         if (del_timer_sync(&ifmgd->timer))
2891                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2892
2893         cancel_work_sync(&ifmgd->chswitch_work);
2894         if (del_timer_sync(&ifmgd->chswitch_timer))
2895                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2896
2897         /* these will just be re-established on connection */
2898         del_timer_sync(&ifmgd->conn_mon_timer);
2899         del_timer_sync(&ifmgd->bcn_mon_timer);
2900 }
2901
2902 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2903 {
2904         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2905
2906         if (!ifmgd->associated)
2907                 return;
2908
2909         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2910                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2911                 mutex_lock(&ifmgd->mtx);
2912                 if (ifmgd->associated) {
2913                         mlme_dbg(sdata,
2914                                  "driver requested disconnect after resume\n");
2915                         ieee80211_sta_connection_lost(sdata,
2916                                 ifmgd->associated->bssid,
2917                                 WLAN_REASON_UNSPECIFIED);
2918                         mutex_unlock(&ifmgd->mtx);
2919                         return;
2920                 }
2921                 mutex_unlock(&ifmgd->mtx);
2922         }
2923
2924         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2925                 add_timer(&ifmgd->timer);
2926         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2927                 add_timer(&ifmgd->chswitch_timer);
2928         ieee80211_sta_reset_beacon_monitor(sdata);
2929
2930         mutex_lock(&sdata->local->mtx);
2931         ieee80211_restart_sta_timer(sdata);
2932         mutex_unlock(&sdata->local->mtx);
2933 }
2934 #endif
2935
2936 /* interface setup */
2937 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2938 {
2939         struct ieee80211_if_managed *ifmgd;
2940
2941         ifmgd = &sdata->u.mgd;
2942         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2943         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2944         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2945                   ieee80211_beacon_connection_loss_work);
2946         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2947         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2948                     (unsigned long) sdata);
2949         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2950                     (unsigned long) sdata);
2951         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2952                     (unsigned long) sdata);
2953         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2954                     (unsigned long) sdata);
2955
2956         ifmgd->flags = 0;
2957         ifmgd->powersave = sdata->wdev.ps;
2958         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
2959         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
2960
2961         mutex_init(&ifmgd->mtx);
2962
2963         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2964                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2965         else
2966                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2967 }
2968
2969 /* scan finished notification */
2970 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2971 {
2972         struct ieee80211_sub_if_data *sdata;
2973
2974         /* Restart STA timers */
2975         rcu_read_lock();
2976         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2977                 ieee80211_restart_sta_timer(sdata);
2978         rcu_read_unlock();
2979 }
2980
2981 int ieee80211_max_network_latency(struct notifier_block *nb,
2982                                   unsigned long data, void *dummy)
2983 {
2984         s32 latency_usec = (s32) data;
2985         struct ieee80211_local *local =
2986                 container_of(nb, struct ieee80211_local,
2987                              network_latency_notifier);
2988
2989         mutex_lock(&local->iflist_mtx);
2990         ieee80211_recalc_ps(local, latency_usec);
2991         mutex_unlock(&local->iflist_mtx);
2992
2993         return 0;
2994 }
2995
2996 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
2997                                      struct cfg80211_bss *cbss, bool assoc)
2998 {
2999         struct ieee80211_local *local = sdata->local;
3000         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3001         struct ieee80211_bss *bss = (void *)cbss->priv;
3002         struct sta_info *sta = NULL;
3003         bool have_sta = false;
3004         int err;
3005         int ht_cfreq;
3006         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3007         const u8 *ht_oper_ie;
3008         const struct ieee80211_ht_operation *ht_oper = NULL;
3009         struct ieee80211_supported_band *sband;
3010
3011         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3012                 return -EINVAL;
3013
3014         if (assoc) {
3015                 rcu_read_lock();
3016                 have_sta = sta_info_get(sdata, cbss->bssid);
3017                 rcu_read_unlock();
3018         }
3019
3020         if (!have_sta) {
3021                 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3022                 if (!sta)
3023                         return -ENOMEM;
3024         }
3025
3026         mutex_lock(&local->mtx);
3027         ieee80211_recalc_idle(sdata->local);
3028         mutex_unlock(&local->mtx);
3029
3030         /* switch to the right channel */
3031         sband = local->hw.wiphy->bands[cbss->channel->band];
3032
3033         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3034
3035         if (sband->ht_cap.ht_supported) {
3036                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3037                                               cbss->information_elements,
3038                                               cbss->len_information_elements);
3039                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3040                         ht_oper = (void *)(ht_oper_ie + 2);
3041         }
3042
3043         if (ht_oper) {
3044                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3045                                                           cbss->channel->band);
3046                 /* check that channel matches the right operating channel */
3047                 if (cbss->channel->center_freq != ht_cfreq) {
3048                         /*
3049                          * It's possible that some APs are confused here;
3050                          * Netgear WNDR3700 sometimes reports 4 higher than
3051                          * the actual channel in association responses, but
3052                          * since we look at probe response/beacon data here
3053                          * it should be OK.
3054                          */
3055                         sdata_info(sdata,
3056                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3057                                    cbss->channel->center_freq,
3058                                    ht_cfreq, ht_oper->primary_chan,
3059                                    cbss->channel->band);
3060                         ht_oper = NULL;
3061                 }
3062         }
3063
3064         if (ht_oper) {
3065                 channel_type = NL80211_CHAN_HT20;
3066
3067                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3068                         switch (ht_oper->ht_param &
3069                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3070                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3071                                 channel_type = NL80211_CHAN_HT40PLUS;
3072                                 break;
3073                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3074                                 channel_type = NL80211_CHAN_HT40MINUS;
3075                                 break;
3076                         }
3077                 }
3078         }
3079
3080         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3081                 /* can only fail due to HT40+/- mismatch */
3082                 channel_type = NL80211_CHAN_HT20;
3083                 sdata_info(sdata,
3084                            "disabling 40 MHz due to multi-vif mismatch\n");
3085                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3086                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3087                                                     channel_type));
3088         }
3089
3090         local->oper_channel = cbss->channel;
3091         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3092
3093         if (sta) {
3094                 u32 rates = 0, basic_rates = 0;
3095                 bool have_higher_than_11mbit;
3096                 int min_rate = INT_MAX, min_rate_index = -1;
3097
3098                 ieee80211_get_rates(sband, bss->supp_rates,
3099                                     bss->supp_rates_len,
3100                                     &rates, &basic_rates,
3101                                     &have_higher_than_11mbit,
3102                                     &min_rate, &min_rate_index);
3103
3104                 /*
3105                  * This used to be a workaround for basic rates missing
3106                  * in the association response frame. Now that we no
3107                  * longer use the basic rates from there, it probably
3108                  * doesn't happen any more, but keep the workaround so
3109                  * in case some *other* APs are buggy in different ways
3110                  * we can connect -- with a warning.
3111                  */
3112                 if (!basic_rates && min_rate_index >= 0) {
3113                         sdata_info(sdata,
3114                                    "No basic rates, using min rate instead\n");
3115                         basic_rates = BIT(min_rate_index);
3116                 }
3117
3118                 sta->sta.supp_rates[cbss->channel->band] = rates;
3119                 sdata->vif.bss_conf.basic_rates = basic_rates;
3120
3121                 /* cf. IEEE 802.11 9.2.12 */
3122                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3123                     have_higher_than_11mbit)
3124                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3125                 else
3126                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3127
3128                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3129
3130                 /* set timing information */
3131                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3132                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3133                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3134
3135                 /* tell driver about BSSID, basic rates and timing */
3136                 ieee80211_bss_info_change_notify(sdata,
3137                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3138                         BSS_CHANGED_BEACON_INT);
3139
3140                 if (assoc)
3141                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3142
3143                 err = sta_info_insert(sta);
3144                 sta = NULL;
3145                 if (err) {
3146                         sdata_info(sdata,
3147                                    "failed to insert STA entry for the AP (error %d)\n",
3148                                    err);
3149                         return err;
3150                 }
3151         } else
3152                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3153
3154         return 0;
3155 }
3156
3157 /* config hooks */
3158 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3159                        struct cfg80211_auth_request *req)
3160 {
3161         struct ieee80211_local *local = sdata->local;
3162         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3163         struct ieee80211_mgd_auth_data *auth_data;
3164         u16 auth_alg;
3165         int err;
3166
3167         /* prepare auth data structure */
3168
3169         switch (req->auth_type) {
3170         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3171                 auth_alg = WLAN_AUTH_OPEN;
3172                 break;
3173         case NL80211_AUTHTYPE_SHARED_KEY:
3174                 if (IS_ERR(local->wep_tx_tfm))
3175                         return -EOPNOTSUPP;
3176                 auth_alg = WLAN_AUTH_SHARED_KEY;
3177                 break;
3178         case NL80211_AUTHTYPE_FT:
3179                 auth_alg = WLAN_AUTH_FT;
3180                 break;
3181         case NL80211_AUTHTYPE_NETWORK_EAP:
3182                 auth_alg = WLAN_AUTH_LEAP;
3183                 break;
3184         default:
3185                 return -EOPNOTSUPP;
3186         }
3187
3188         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3189         if (!auth_data)
3190                 return -ENOMEM;
3191
3192         auth_data->bss = req->bss;
3193
3194         if (req->ie && req->ie_len) {
3195                 memcpy(auth_data->ie, req->ie, req->ie_len);
3196                 auth_data->ie_len = req->ie_len;
3197         }
3198
3199         if (req->key && req->key_len) {
3200                 auth_data->key_len = req->key_len;
3201                 auth_data->key_idx = req->key_idx;
3202                 memcpy(auth_data->key, req->key, req->key_len);
3203         }
3204
3205         auth_data->algorithm = auth_alg;
3206
3207         /* try to authenticate/probe */
3208
3209         mutex_lock(&ifmgd->mtx);
3210
3211         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3212             ifmgd->assoc_data) {
3213                 err = -EBUSY;
3214                 goto err_free;
3215         }
3216
3217         if (ifmgd->auth_data)
3218                 ieee80211_destroy_auth_data(sdata, false);
3219
3220         /* prep auth_data so we don't go into idle on disassoc */
3221         ifmgd->auth_data = auth_data;
3222
3223         if (ifmgd->associated)
3224                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3225
3226         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3227
3228         err = ieee80211_prep_connection(sdata, req->bss, false);
3229         if (err)
3230                 goto err_clear;
3231
3232         err = ieee80211_probe_auth(sdata);
3233         if (err) {
3234                 sta_info_destroy_addr(sdata, req->bss->bssid);
3235                 goto err_clear;
3236         }
3237
3238         /* hold our own reference */
3239         cfg80211_ref_bss(auth_data->bss);
3240         err = 0;
3241         goto out_unlock;
3242
3243  err_clear:
3244         ifmgd->auth_data = NULL;
3245  err_free:
3246         kfree(auth_data);
3247  out_unlock:
3248         mutex_unlock(&ifmgd->mtx);
3249
3250         return err;
3251 }
3252
3253 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3254                         struct cfg80211_assoc_request *req)
3255 {
3256         struct ieee80211_local *local = sdata->local;
3257         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3258         struct ieee80211_bss *bss = (void *)req->bss->priv;
3259         struct ieee80211_mgd_assoc_data *assoc_data;
3260         struct ieee80211_supported_band *sband;
3261         const u8 *ssidie, *ht_ie;
3262         int i, err;
3263
3264         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3265         if (!ssidie)
3266                 return -EINVAL;
3267
3268         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3269         if (!assoc_data)
3270                 return -ENOMEM;
3271
3272         mutex_lock(&ifmgd->mtx);
3273
3274         if (ifmgd->associated)
3275                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3276
3277         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3278                 err = -EBUSY;
3279                 goto err_free;
3280         }
3281
3282         if (ifmgd->assoc_data) {
3283                 err = -EBUSY;
3284                 goto err_free;
3285         }
3286
3287         if (ifmgd->auth_data) {
3288                 bool match;
3289
3290                 /* keep sta info, bssid if matching */
3291                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3292                 ieee80211_destroy_auth_data(sdata, match);
3293         }
3294
3295         /* prepare assoc data */
3296
3297         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3298         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3299
3300         ifmgd->beacon_crc_valid = false;
3301
3302         /*
3303          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3304          * We still associate in non-HT mode (11a/b/g) if any one of these
3305          * ciphers is configured as pairwise.
3306          * We can set this to true for non-11n hardware, that'll be checked
3307          * separately along with the peer capabilities.
3308          */
3309         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3310                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3311                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3312                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3313                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3314                         netdev_info(sdata->dev,
3315                                     "disabling HT due to WEP/TKIP use\n");
3316                 }
3317         }
3318
3319         if (req->flags & ASSOC_REQ_DISABLE_HT)
3320                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3321
3322         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3323         sband = local->hw.wiphy->bands[req->bss->channel->band];
3324         if (!sband->ht_cap.ht_supported ||
3325             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3326                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3327                 netdev_info(sdata->dev,
3328                             "disabling HT as WMM/QoS is not supported\n");
3329         }
3330
3331         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3332         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3333                sizeof(ifmgd->ht_capa_mask));
3334
3335         if (req->ie && req->ie_len) {
3336                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3337                 assoc_data->ie_len = req->ie_len;
3338         }
3339
3340         assoc_data->bss = req->bss;
3341
3342         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3343                 if (ifmgd->powersave)
3344                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3345                 else
3346                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3347         } else
3348                 ifmgd->ap_smps = ifmgd->req_smps;
3349
3350         assoc_data->capability = req->bss->capability;
3351         assoc_data->wmm = bss->wmm_used &&
3352                           (local->hw.queues >= IEEE80211_NUM_ACS);
3353         assoc_data->supp_rates = bss->supp_rates;
3354         assoc_data->supp_rates_len = bss->supp_rates_len;
3355
3356         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3357         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3358                 assoc_data->ap_ht_param =
3359                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3360         else
3361                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3362
3363         if (bss->wmm_used && bss->uapsd_supported &&
3364             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3365                 assoc_data->uapsd = true;
3366                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3367         } else {
3368                 assoc_data->uapsd = false;
3369                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3370         }
3371
3372         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3373         assoc_data->ssid_len = ssidie[1];
3374
3375         if (req->prev_bssid)
3376                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3377
3378         if (req->use_mfp) {
3379                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3380                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3381         } else {
3382                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3383                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3384         }
3385
3386         if (req->crypto.control_port)
3387                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3388         else
3389                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3390
3391         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3392         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3393
3394         /* kick off associate process */
3395
3396         ifmgd->assoc_data = assoc_data;
3397
3398         err = ieee80211_prep_connection(sdata, req->bss, true);
3399         if (err)
3400                 goto err_clear;
3401
3402         if (!bss->dtim_period &&
3403             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3404                 /*
3405                  * Wait up to one beacon interval ...
3406                  * should this be more if we miss one?
3407                  */
3408                 sdata_info(sdata, "waiting for beacon from %pM\n",
3409                            ifmgd->bssid);
3410                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3411         } else {
3412                 assoc_data->have_beacon = true;
3413                 assoc_data->sent_assoc = false;
3414                 assoc_data->timeout = jiffies;
3415         }
3416         run_again(ifmgd, assoc_data->timeout);
3417
3418         if (bss->corrupt_data) {
3419                 char *corrupt_type = "data";
3420                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3421                         if (bss->corrupt_data &
3422                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3423                                 corrupt_type = "beacon and probe response";
3424                         else
3425                                 corrupt_type = "beacon";
3426                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3427                         corrupt_type = "probe response";
3428                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3429                            corrupt_type);
3430         }
3431
3432         err = 0;
3433         goto out;
3434  err_clear:
3435         ifmgd->assoc_data = NULL;
3436  err_free:
3437         kfree(assoc_data);
3438  out:
3439         mutex_unlock(&ifmgd->mtx);
3440
3441         return err;
3442 }
3443
3444 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3445                          struct cfg80211_deauth_request *req)
3446 {
3447         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3448         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3449
3450         mutex_lock(&ifmgd->mtx);
3451
3452         if (ifmgd->auth_data) {
3453                 ieee80211_destroy_auth_data(sdata, false);
3454                 mutex_unlock(&ifmgd->mtx);
3455                 return 0;
3456         }
3457
3458         sdata_info(sdata,
3459                    "deauthenticating from %pM by local choice (reason=%d)\n",
3460                    req->bssid, req->reason_code);
3461
3462         if (ifmgd->associated &&
3463             ether_addr_equal(ifmgd->associated->bssid, req->bssid))
3464                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3465                                        req->reason_code, true, frame_buf);
3466         else
3467                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3468                                                IEEE80211_STYPE_DEAUTH,
3469                                                req->reason_code, true,
3470                                                frame_buf);
3471         mutex_unlock(&ifmgd->mtx);
3472
3473         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3474
3475         mutex_lock(&sdata->local->mtx);
3476         ieee80211_recalc_idle(sdata->local);
3477         mutex_unlock(&sdata->local->mtx);
3478
3479         return 0;
3480 }
3481
3482 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3483                            struct cfg80211_disassoc_request *req)
3484 {
3485         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3486         u8 bssid[ETH_ALEN];
3487         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3488
3489         mutex_lock(&ifmgd->mtx);
3490
3491         /*
3492          * cfg80211 should catch this ... but it's racy since
3493          * we can receive a disassoc frame, process it, hand it
3494          * to cfg80211 while that's in a locked section already
3495          * trying to tell us that the user wants to disconnect.
3496          */
3497         if (ifmgd->associated != req->bss) {
3498                 mutex_unlock(&ifmgd->mtx);
3499                 return -ENOLINK;
3500         }
3501
3502         sdata_info(sdata,
3503                    "disassociating from %pM by local choice (reason=%d)\n",
3504                    req->bss->bssid, req->reason_code);
3505
3506         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3507         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3508                                req->reason_code, !req->local_state_change,
3509                                frame_buf);
3510         mutex_unlock(&ifmgd->mtx);
3511
3512         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3513
3514         mutex_lock(&sdata->local->mtx);
3515         ieee80211_recalc_idle(sdata->local);
3516         mutex_unlock(&sdata->local->mtx);
3517
3518         return 0;
3519 }
3520
3521 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3522 {
3523         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3524
3525         mutex_lock(&ifmgd->mtx);
3526         if (ifmgd->assoc_data)
3527                 ieee80211_destroy_assoc_data(sdata, false);
3528         if (ifmgd->auth_data)
3529                 ieee80211_destroy_auth_data(sdata, false);
3530         del_timer_sync(&ifmgd->timer);
3531         mutex_unlock(&ifmgd->mtx);
3532 }
3533
3534 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3535                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3536                                gfp_t gfp)
3537 {
3538         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3539
3540         trace_api_cqm_rssi_notify(sdata, rssi_event);
3541
3542         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3543 }
3544 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);