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