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         local->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                                 local->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                                 local->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                                 local->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                                 local->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 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1190                 wiphy_debug(local->hw.wiphy,
1191                             "WMM queue=%d aci=%d acm=%d aifs=%d "
1192                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1193                             queue, aci, acm,
1194                             params.aifs, params.cw_min, params.cw_max,
1195                             params.txop, params.uapsd);
1196 #endif
1197                 sdata->tx_conf[queue] = params;
1198                 if (drv_conf_tx(local, sdata, queue, &params))
1199                         wiphy_debug(local->hw.wiphy,
1200                                     "failed to set TX queue parameters for queue %d\n",
1201                                     queue);
1202         }
1203
1204         /* enable WMM or activate new settings */
1205         sdata->vif.bss_conf.qos = true;
1206 }
1207
1208 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1209 {
1210         lockdep_assert_held(&sdata->local->mtx);
1211
1212         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1213                                 IEEE80211_STA_BEACON_POLL);
1214         ieee80211_run_deferred_scan(sdata->local);
1215 }
1216
1217 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1218 {
1219         mutex_lock(&sdata->local->mtx);
1220         __ieee80211_stop_poll(sdata);
1221         mutex_unlock(&sdata->local->mtx);
1222 }
1223
1224 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1225                                            u16 capab, bool erp_valid, u8 erp)
1226 {
1227         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1228         u32 changed = 0;
1229         bool use_protection;
1230         bool use_short_preamble;
1231         bool use_short_slot;
1232
1233         if (erp_valid) {
1234                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1235                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1236         } else {
1237                 use_protection = false;
1238                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1239         }
1240
1241         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1242         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
1243                 use_short_slot = true;
1244
1245         if (use_protection != bss_conf->use_cts_prot) {
1246                 bss_conf->use_cts_prot = use_protection;
1247                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1248         }
1249
1250         if (use_short_preamble != bss_conf->use_short_preamble) {
1251                 bss_conf->use_short_preamble = use_short_preamble;
1252                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1253         }
1254
1255         if (use_short_slot != bss_conf->use_short_slot) {
1256                 bss_conf->use_short_slot = use_short_slot;
1257                 changed |= BSS_CHANGED_ERP_SLOT;
1258         }
1259
1260         return changed;
1261 }
1262
1263 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1264                                      struct cfg80211_bss *cbss,
1265                                      u32 bss_info_changed)
1266 {
1267         struct ieee80211_bss *bss = (void *)cbss->priv;
1268         struct ieee80211_local *local = sdata->local;
1269         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1270
1271         bss_info_changed |= BSS_CHANGED_ASSOC;
1272         /* set timing information */
1273         bss_conf->beacon_int = cbss->beacon_interval;
1274         bss_conf->last_tsf = cbss->tsf;
1275
1276         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1277         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1278                 cbss->capability, bss->has_erp_value, bss->erp_value);
1279
1280         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1281                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1282
1283         sdata->u.mgd.associated = cbss;
1284         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1285
1286         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1287
1288         /* just to be sure */
1289         ieee80211_stop_poll(sdata);
1290
1291         ieee80211_led_assoc(local, 1);
1292
1293         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1294                 bss_conf->dtim_period = bss->dtim_period;
1295         else
1296                 bss_conf->dtim_period = 0;
1297
1298         bss_conf->assoc = 1;
1299
1300         /* Tell the driver to monitor connection quality (if supported) */
1301         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1302             bss_conf->cqm_rssi_thold)
1303                 bss_info_changed |= BSS_CHANGED_CQM;
1304
1305         /* Enable ARP filtering */
1306         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1307                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1308                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1309         }
1310
1311         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1312
1313         mutex_lock(&local->iflist_mtx);
1314         ieee80211_recalc_ps(local, -1);
1315         ieee80211_recalc_smps(local);
1316         mutex_unlock(&local->iflist_mtx);
1317
1318         netif_tx_start_all_queues(sdata->dev);
1319         netif_carrier_on(sdata->dev);
1320 }
1321
1322 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1323                                    u16 stype, u16 reason, bool tx,
1324                                    u8 *frame_buf)
1325 {
1326         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1327         struct ieee80211_local *local = sdata->local;
1328         struct sta_info *sta;
1329         u32 changed = 0;
1330         u8 bssid[ETH_ALEN];
1331
1332         ASSERT_MGD_MTX(ifmgd);
1333
1334         if (WARN_ON_ONCE(tx && !frame_buf))
1335                 return;
1336
1337         if (WARN_ON(!ifmgd->associated))
1338                 return;
1339
1340         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1341
1342         ifmgd->associated = NULL;
1343         memset(ifmgd->bssid, 0, ETH_ALEN);
1344
1345         /*
1346          * we need to commit the associated = NULL change because the
1347          * scan code uses that to determine whether this iface should
1348          * go to/wake up from powersave or not -- and could otherwise
1349          * wake the queues erroneously.
1350          */
1351         smp_mb();
1352
1353         /*
1354          * Thus, we can only afterwards stop the queues -- to account
1355          * for the case where another CPU is finishing a scan at this
1356          * time -- we don't want the scan code to enable queues.
1357          */
1358
1359         netif_tx_stop_all_queues(sdata->dev);
1360         netif_carrier_off(sdata->dev);
1361
1362         mutex_lock(&local->sta_mtx);
1363         sta = sta_info_get(sdata, bssid);
1364         if (sta) {
1365                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1366                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1367         }
1368         mutex_unlock(&local->sta_mtx);
1369
1370         /* deauthenticate/disassociate now */
1371         if (tx || frame_buf)
1372                 ieee80211_send_deauth_disassoc(sdata, bssid, stype, reason,
1373                                                tx, frame_buf);
1374
1375         /* flush out frame */
1376         if (tx)
1377                 drv_flush(local, false);
1378
1379         /* remove AP and TDLS peers */
1380         sta_info_flush(local, sdata);
1381
1382         /* finally reset all BSS / config parameters */
1383         changed |= ieee80211_reset_erp_info(sdata);
1384
1385         ieee80211_led_assoc(local, 0);
1386         changed |= BSS_CHANGED_ASSOC;
1387         sdata->vif.bss_conf.assoc = false;
1388
1389         /* on the next assoc, re-program HT parameters */
1390         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1391         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1392
1393         local->power_constr_level = 0;
1394
1395         del_timer_sync(&local->dynamic_ps_timer);
1396         cancel_work_sync(&local->dynamic_ps_enable_work);
1397
1398         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1399                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1400                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1401         }
1402         local->ps_sdata = NULL;
1403
1404         /* Disable ARP filtering */
1405         if (sdata->vif.bss_conf.arp_filter_enabled) {
1406                 sdata->vif.bss_conf.arp_filter_enabled = false;
1407                 changed |= BSS_CHANGED_ARP_FILTER;
1408         }
1409
1410         sdata->vif.bss_conf.qos = false;
1411         changed |= BSS_CHANGED_QOS;
1412
1413         /* The BSSID (not really interesting) and HT changed */
1414         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1415         ieee80211_bss_info_change_notify(sdata, changed);
1416
1417         /* channel(_type) changes are handled by ieee80211_hw_config */
1418         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1419         ieee80211_hw_config(local, 0);
1420
1421         /* disassociated - set to defaults now */
1422         ieee80211_set_wmm_default(sdata, false);
1423
1424         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1425         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1426         del_timer_sync(&sdata->u.mgd.timer);
1427         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1428 }
1429
1430 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1431                              struct ieee80211_hdr *hdr)
1432 {
1433         /*
1434          * We can postpone the mgd.timer whenever receiving unicast frames
1435          * from AP because we know that the connection is working both ways
1436          * at that time. But multicast frames (and hence also beacons) must
1437          * be ignored here, because we need to trigger the timer during
1438          * data idle periods for sending the periodic probe request to the
1439          * AP we're connected to.
1440          */
1441         if (is_multicast_ether_addr(hdr->addr1))
1442                 return;
1443
1444         ieee80211_sta_reset_conn_monitor(sdata);
1445 }
1446
1447 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1448 {
1449         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1450         struct ieee80211_local *local = sdata->local;
1451
1452         mutex_lock(&local->mtx);
1453         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1454                               IEEE80211_STA_CONNECTION_POLL))) {
1455                 mutex_unlock(&local->mtx);
1456                 return;
1457         }
1458
1459         __ieee80211_stop_poll(sdata);
1460
1461         mutex_lock(&local->iflist_mtx);
1462         ieee80211_recalc_ps(local, -1);
1463         mutex_unlock(&local->iflist_mtx);
1464
1465         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1466                 goto out;
1467
1468         /*
1469          * We've received a probe response, but are not sure whether
1470          * we have or will be receiving any beacons or data, so let's
1471          * schedule the timers again, just in case.
1472          */
1473         ieee80211_sta_reset_beacon_monitor(sdata);
1474
1475         mod_timer(&ifmgd->conn_mon_timer,
1476                   round_jiffies_up(jiffies +
1477                                    IEEE80211_CONNECTION_IDLE_TIME));
1478 out:
1479         mutex_unlock(&local->mtx);
1480 }
1481
1482 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1483                              struct ieee80211_hdr *hdr, bool ack)
1484 {
1485         if (!ieee80211_is_data(hdr->frame_control))
1486             return;
1487
1488         if (ack)
1489                 ieee80211_sta_reset_conn_monitor(sdata);
1490
1491         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1492             sdata->u.mgd.probe_send_count > 0) {
1493                 if (ack)
1494                         sdata->u.mgd.probe_send_count = 0;
1495                 else
1496                         sdata->u.mgd.nullfunc_failed = true;
1497                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1498         }
1499 }
1500
1501 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1502 {
1503         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1504         const u8 *ssid;
1505         u8 *dst = ifmgd->associated->bssid;
1506         u8 unicast_limit = max(1, max_probe_tries - 3);
1507
1508         /*
1509          * Try sending broadcast probe requests for the last three
1510          * probe requests after the first ones failed since some
1511          * buggy APs only support broadcast probe requests.
1512          */
1513         if (ifmgd->probe_send_count >= unicast_limit)
1514                 dst = NULL;
1515
1516         /*
1517          * When the hardware reports an accurate Tx ACK status, it's
1518          * better to send a nullfunc frame instead of a probe request,
1519          * as it will kick us off the AP quickly if we aren't associated
1520          * anymore. The timeout will be reset if the frame is ACKed by
1521          * the AP.
1522          */
1523         ifmgd->probe_send_count++;
1524
1525         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1526                 ifmgd->nullfunc_failed = false;
1527                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1528         } else {
1529                 int ssid_len;
1530
1531                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1532                 if (WARN_ON_ONCE(ssid == NULL))
1533                         ssid_len = 0;
1534                 else
1535                         ssid_len = ssid[1];
1536
1537                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1538                                          0, (u32) -1, true, false);
1539         }
1540
1541         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1542         run_again(ifmgd, ifmgd->probe_timeout);
1543         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1544                 drv_flush(sdata->local, false);
1545 }
1546
1547 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1548                                    bool beacon)
1549 {
1550         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1551         bool already = false;
1552
1553         if (!ieee80211_sdata_running(sdata))
1554                 return;
1555
1556         mutex_lock(&ifmgd->mtx);
1557
1558         if (!ifmgd->associated)
1559                 goto out;
1560
1561         mutex_lock(&sdata->local->mtx);
1562
1563         if (sdata->local->tmp_channel || sdata->local->scanning) {
1564                 mutex_unlock(&sdata->local->mtx);
1565                 goto out;
1566         }
1567
1568 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1569         if (beacon)
1570                 net_dbg_ratelimited("%s: detected beacon loss from AP - sending probe request\n",
1571                                     sdata->name);
1572 #endif
1573         ieee80211_cqm_rssi_notify(&sdata->vif,
1574                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1575
1576         /*
1577          * The driver/our work has already reported this event or the
1578          * connection monitoring has kicked in and we have already sent
1579          * a probe request. Or maybe the AP died and the driver keeps
1580          * reporting until we disassociate...
1581          *
1582          * In either case we have to ignore the current call to this
1583          * function (except for setting the correct probe reason bit)
1584          * because otherwise we would reset the timer every time and
1585          * never check whether we received a probe response!
1586          */
1587         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1588                             IEEE80211_STA_CONNECTION_POLL))
1589                 already = true;
1590
1591         if (beacon)
1592                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1593         else
1594                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1595
1596         mutex_unlock(&sdata->local->mtx);
1597
1598         if (already)
1599                 goto out;
1600
1601         mutex_lock(&sdata->local->iflist_mtx);
1602         ieee80211_recalc_ps(sdata->local, -1);
1603         mutex_unlock(&sdata->local->iflist_mtx);
1604
1605         ifmgd->probe_send_count = 0;
1606         ieee80211_mgd_probe_ap_send(sdata);
1607  out:
1608         mutex_unlock(&ifmgd->mtx);
1609 }
1610
1611 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1612                                           struct ieee80211_vif *vif)
1613 {
1614         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1615         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1616         struct sk_buff *skb;
1617         const u8 *ssid;
1618         int ssid_len;
1619
1620         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1621                 return NULL;
1622
1623         ASSERT_MGD_MTX(ifmgd);
1624
1625         if (!ifmgd->associated)
1626                 return NULL;
1627
1628         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1629         if (WARN_ON_ONCE(ssid == NULL))
1630                 ssid_len = 0;
1631         else
1632                 ssid_len = ssid[1];
1633
1634         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1635                                         (u32) -1, ssid + 2, ssid_len,
1636                                         NULL, 0, true);
1637
1638         return skb;
1639 }
1640 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1641
1642 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1643 {
1644         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1645         struct ieee80211_local *local = sdata->local;
1646         u8 bssid[ETH_ALEN];
1647         u8 frame_buf[DEAUTH_DISASSOC_LEN];
1648
1649         mutex_lock(&ifmgd->mtx);
1650         if (!ifmgd->associated) {
1651                 mutex_unlock(&ifmgd->mtx);
1652                 return;
1653         }
1654
1655         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1656
1657         pr_debug("%s: Connection to AP %pM lost\n", sdata->name, bssid);
1658
1659         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1660                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1661                                false, frame_buf);
1662         mutex_unlock(&ifmgd->mtx);
1663
1664         /*
1665          * must be outside lock due to cfg80211,
1666          * but that's not a problem.
1667          */
1668         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
1669
1670         mutex_lock(&local->mtx);
1671         ieee80211_recalc_idle(local);
1672         mutex_unlock(&local->mtx);
1673 }
1674
1675 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1676 {
1677         struct ieee80211_sub_if_data *sdata =
1678                 container_of(work, struct ieee80211_sub_if_data,
1679                              u.mgd.beacon_connection_loss_work);
1680         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1681         struct sta_info *sta;
1682
1683         if (ifmgd->associated) {
1684                 rcu_read_lock();
1685                 sta = sta_info_get(sdata, ifmgd->bssid);
1686                 if (sta)
1687                         sta->beacon_loss_count++;
1688                 rcu_read_unlock();
1689         }
1690
1691         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1692                 __ieee80211_connection_loss(sdata);
1693         else
1694                 ieee80211_mgd_probe_ap(sdata, true);
1695 }
1696
1697 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1698 {
1699         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1700         struct ieee80211_hw *hw = &sdata->local->hw;
1701
1702         trace_api_beacon_loss(sdata);
1703
1704         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1705         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1706 }
1707 EXPORT_SYMBOL(ieee80211_beacon_loss);
1708
1709 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1710 {
1711         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1712         struct ieee80211_hw *hw = &sdata->local->hw;
1713
1714         trace_api_connection_loss(sdata);
1715
1716         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1717         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1718 }
1719 EXPORT_SYMBOL(ieee80211_connection_loss);
1720
1721
1722 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1723                                         bool assoc)
1724 {
1725         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1726
1727         lockdep_assert_held(&sdata->u.mgd.mtx);
1728
1729         if (!assoc) {
1730                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1731
1732                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1733                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1734         }
1735
1736         cfg80211_put_bss(auth_data->bss);
1737         kfree(auth_data);
1738         sdata->u.mgd.auth_data = NULL;
1739 }
1740
1741 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1742                                      struct ieee80211_mgmt *mgmt, size_t len)
1743 {
1744         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1745         u8 *pos;
1746         struct ieee802_11_elems elems;
1747
1748         pos = mgmt->u.auth.variable;
1749         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1750         if (!elems.challenge)
1751                 return;
1752         auth_data->expected_transaction = 4;
1753         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1754                             elems.challenge - 2, elems.challenge_len + 2,
1755                             auth_data->bss->bssid, auth_data->bss->bssid,
1756                             auth_data->key, auth_data->key_len,
1757                             auth_data->key_idx);
1758 }
1759
1760 static enum rx_mgmt_action __must_check
1761 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1762                        struct ieee80211_mgmt *mgmt, size_t len)
1763 {
1764         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1765         u8 bssid[ETH_ALEN];
1766         u16 auth_alg, auth_transaction, status_code;
1767         struct sta_info *sta;
1768
1769         lockdep_assert_held(&ifmgd->mtx);
1770
1771         if (len < 24 + 6)
1772                 return RX_MGMT_NONE;
1773
1774         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1775                 return RX_MGMT_NONE;
1776
1777         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1778
1779         if (!ether_addr_equal(bssid, mgmt->bssid))
1780                 return RX_MGMT_NONE;
1781
1782         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1783         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1784         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1785
1786         if (auth_alg != ifmgd->auth_data->algorithm ||
1787             auth_transaction != ifmgd->auth_data->expected_transaction)
1788                 return RX_MGMT_NONE;
1789
1790         if (status_code != WLAN_STATUS_SUCCESS) {
1791                 pr_debug("%s: %pM denied authentication (status %d)\n",
1792                          sdata->name, mgmt->sa, status_code);
1793                 ieee80211_destroy_auth_data(sdata, false);
1794                 return RX_MGMT_CFG80211_RX_AUTH;
1795         }
1796
1797         switch (ifmgd->auth_data->algorithm) {
1798         case WLAN_AUTH_OPEN:
1799         case WLAN_AUTH_LEAP:
1800         case WLAN_AUTH_FT:
1801                 break;
1802         case WLAN_AUTH_SHARED_KEY:
1803                 if (ifmgd->auth_data->expected_transaction != 4) {
1804                         ieee80211_auth_challenge(sdata, mgmt, len);
1805                         /* need another frame */
1806                         return RX_MGMT_NONE;
1807                 }
1808                 break;
1809         default:
1810                 WARN_ONCE(1, "invalid auth alg %d",
1811                           ifmgd->auth_data->algorithm);
1812                 return RX_MGMT_NONE;
1813         }
1814
1815         pr_debug("%s: authenticated\n", sdata->name);
1816         ifmgd->auth_data->done = true;
1817         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1818         run_again(ifmgd, ifmgd->auth_data->timeout);
1819
1820         /* move station state to auth */
1821         mutex_lock(&sdata->local->sta_mtx);
1822         sta = sta_info_get(sdata, bssid);
1823         if (!sta) {
1824                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1825                 goto out_err;
1826         }
1827         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1828                 pr_debug("%s: failed moving %pM to auth\n", sdata->name, bssid);
1829                 goto out_err;
1830         }
1831         mutex_unlock(&sdata->local->sta_mtx);
1832
1833         return RX_MGMT_CFG80211_RX_AUTH;
1834  out_err:
1835         mutex_unlock(&sdata->local->sta_mtx);
1836         /* ignore frame -- wait for timeout */
1837         return RX_MGMT_NONE;
1838 }
1839
1840
1841 static enum rx_mgmt_action __must_check
1842 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1843                          struct ieee80211_mgmt *mgmt, size_t len)
1844 {
1845         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1846         const u8 *bssid = NULL;
1847         u16 reason_code;
1848
1849         lockdep_assert_held(&ifmgd->mtx);
1850
1851         if (len < 24 + 2)
1852                 return RX_MGMT_NONE;
1853
1854         if (!ifmgd->associated ||
1855             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1856                 return RX_MGMT_NONE;
1857
1858         bssid = ifmgd->associated->bssid;
1859
1860         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1861
1862         pr_debug("%s: deauthenticated from %pM (Reason: %u)\n",
1863                  sdata->name, bssid, reason_code);
1864
1865         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1866
1867         mutex_lock(&sdata->local->mtx);
1868         ieee80211_recalc_idle(sdata->local);
1869         mutex_unlock(&sdata->local->mtx);
1870
1871         return RX_MGMT_CFG80211_DEAUTH;
1872 }
1873
1874
1875 static enum rx_mgmt_action __must_check
1876 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1877                            struct ieee80211_mgmt *mgmt, size_t len)
1878 {
1879         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1880         u16 reason_code;
1881
1882         lockdep_assert_held(&ifmgd->mtx);
1883
1884         if (len < 24 + 2)
1885                 return RX_MGMT_NONE;
1886
1887         if (!ifmgd->associated ||
1888             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1889                 return RX_MGMT_NONE;
1890
1891         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1892
1893         pr_debug("%s: disassociated from %pM (Reason: %u)\n",
1894                  sdata->name, mgmt->sa, reason_code);
1895
1896         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1897
1898         mutex_lock(&sdata->local->mtx);
1899         ieee80211_recalc_idle(sdata->local);
1900         mutex_unlock(&sdata->local->mtx);
1901
1902         return RX_MGMT_CFG80211_DISASSOC;
1903 }
1904
1905 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1906                                 u8 *supp_rates, unsigned int supp_rates_len,
1907                                 u32 *rates, u32 *basic_rates,
1908                                 bool *have_higher_than_11mbit,
1909                                 int *min_rate, int *min_rate_index)
1910 {
1911         int i, j;
1912
1913         for (i = 0; i < supp_rates_len; i++) {
1914                 int rate = (supp_rates[i] & 0x7f) * 5;
1915                 bool is_basic = !!(supp_rates[i] & 0x80);
1916
1917                 if (rate > 110)
1918                         *have_higher_than_11mbit = true;
1919
1920                 /*
1921                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1922                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1923                  *
1924                  * Note: Even through the membership selector and the basic
1925                  *       rate flag share the same bit, they are not exactly
1926                  *       the same.
1927                  */
1928                 if (!!(supp_rates[i] & 0x80) &&
1929                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1930                         continue;
1931
1932                 for (j = 0; j < sband->n_bitrates; j++) {
1933                         if (sband->bitrates[j].bitrate == rate) {
1934                                 *rates |= BIT(j);
1935                                 if (is_basic)
1936                                         *basic_rates |= BIT(j);
1937                                 if (rate < *min_rate) {
1938                                         *min_rate = rate;
1939                                         *min_rate_index = j;
1940                                 }
1941                                 break;
1942                         }
1943                 }
1944         }
1945 }
1946
1947 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
1948                                          bool assoc)
1949 {
1950         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
1951
1952         lockdep_assert_held(&sdata->u.mgd.mtx);
1953
1954         if (!assoc) {
1955                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
1956
1957                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1958                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1959         }
1960
1961         kfree(assoc_data);
1962         sdata->u.mgd.assoc_data = NULL;
1963 }
1964
1965 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
1966                                     struct cfg80211_bss *cbss,
1967                                     struct ieee80211_mgmt *mgmt, size_t len)
1968 {
1969         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1970         struct ieee80211_local *local = sdata->local;
1971         struct ieee80211_supported_band *sband;
1972         struct sta_info *sta;
1973         u8 *pos;
1974         u16 capab_info, aid;
1975         struct ieee802_11_elems elems;
1976         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1977         u32 changed = 0;
1978         int err;
1979
1980         /* AssocResp and ReassocResp have identical structure */
1981
1982         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1983         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1984
1985         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1986                 pr_debug("%s: invalid AID value 0x%x; bits 15:14 not set\n",
1987                          sdata->name, aid);
1988         aid &= ~(BIT(15) | BIT(14));
1989
1990         ifmgd->broken_ap = false;
1991
1992         if (aid == 0 || aid > IEEE80211_MAX_AID) {
1993                 pr_debug("%s: invalid AID value %d (out of range), turn off PS\n",
1994                          sdata->name, aid);
1995                 aid = 0;
1996                 ifmgd->broken_ap = true;
1997         }
1998
1999         pos = mgmt->u.assoc_resp.variable;
2000         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2001
2002         if (!elems.supp_rates) {
2003                 pr_debug("%s: no SuppRates element in AssocResp\n",
2004                          sdata->name);
2005                 return false;
2006         }
2007
2008         ifmgd->aid = aid;
2009
2010         mutex_lock(&sdata->local->sta_mtx);
2011         /*
2012          * station info was already allocated and inserted before
2013          * the association and should be available to us
2014          */
2015         sta = sta_info_get(sdata, cbss->bssid);
2016         if (WARN_ON(!sta)) {
2017                 mutex_unlock(&sdata->local->sta_mtx);
2018                 return false;
2019         }
2020
2021         sband = local->hw.wiphy->bands[local->oper_channel->band];
2022
2023         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2024                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2025                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2026
2027         sta->supports_40mhz =
2028                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2029
2030         rate_control_rate_init(sta);
2031
2032         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2033                 set_sta_flag(sta, WLAN_STA_MFP);
2034
2035         if (elems.wmm_param)
2036                 set_sta_flag(sta, WLAN_STA_WME);
2037
2038         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2039         if (!err)
2040                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2041         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2042                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2043         if (err) {
2044                 pr_debug("%s: failed to move station %pM to desired state\n",
2045                          sdata->name, sta->sta.addr);
2046                 WARN_ON(__sta_info_destroy(sta));
2047                 mutex_unlock(&sdata->local->sta_mtx);
2048                 return false;
2049         }
2050
2051         mutex_unlock(&sdata->local->sta_mtx);
2052
2053         /*
2054          * Always handle WMM once after association regardless
2055          * of the first value the AP uses. Setting -1 here has
2056          * that effect because the AP values is an unsigned
2057          * 4-bit value.
2058          */
2059         ifmgd->wmm_last_param_set = -1;
2060
2061         if (elems.wmm_param)
2062                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2063                                          elems.wmm_param_len);
2064         else
2065                 ieee80211_set_wmm_default(sdata, false);
2066         changed |= BSS_CHANGED_QOS;
2067
2068         if (elems.ht_operation && elems.wmm_param &&
2069             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2070                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2071                                                   cbss->bssid, false);
2072
2073         /* set AID and assoc capability,
2074          * ieee80211_set_associated() will tell the driver */
2075         bss_conf->aid = aid;
2076         bss_conf->assoc_capability = capab_info;
2077         ieee80211_set_associated(sdata, cbss, changed);
2078
2079         /*
2080          * If we're using 4-addr mode, let the AP know that we're
2081          * doing so, so that it can create the STA VLAN on its side
2082          */
2083         if (ifmgd->use_4addr)
2084                 ieee80211_send_4addr_nullfunc(local, sdata);
2085
2086         /*
2087          * Start timer to probe the connection to the AP now.
2088          * Also start the timer that will detect beacon loss.
2089          */
2090         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2091         ieee80211_sta_reset_beacon_monitor(sdata);
2092
2093         return true;
2094 }
2095
2096 static enum rx_mgmt_action __must_check
2097 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2098                              struct ieee80211_mgmt *mgmt, size_t len,
2099                              struct cfg80211_bss **bss)
2100 {
2101         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2102         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2103         u16 capab_info, status_code, aid;
2104         struct ieee802_11_elems elems;
2105         u8 *pos;
2106         bool reassoc;
2107
2108         lockdep_assert_held(&ifmgd->mtx);
2109
2110         if (!assoc_data)
2111                 return RX_MGMT_NONE;
2112         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2113                 return RX_MGMT_NONE;
2114
2115         /*
2116          * AssocResp and ReassocResp have identical structure, so process both
2117          * of them in this function.
2118          */
2119
2120         if (len < 24 + 6)
2121                 return RX_MGMT_NONE;
2122
2123         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2124         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2125         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2126         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2127
2128         pr_debug("%s: RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2129                  sdata->name, reassoc ? "Rea" : "A", mgmt->sa,
2130                  capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2131
2132         pos = mgmt->u.assoc_resp.variable;
2133         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2134
2135         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2136             elems.timeout_int && elems.timeout_int_len == 5 &&
2137             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2138                 u32 tu, ms;
2139                 tu = get_unaligned_le32(elems.timeout_int + 1);
2140                 ms = tu * 1024 / 1000;
2141                 pr_debug("%s: %pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2142                          sdata->name, mgmt->sa, tu, ms);
2143                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2144                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2145                         run_again(ifmgd, assoc_data->timeout);
2146                 return RX_MGMT_NONE;
2147         }
2148
2149         *bss = assoc_data->bss;
2150
2151         if (status_code != WLAN_STATUS_SUCCESS) {
2152                 pr_debug("%s: %pM denied association (code=%d)\n",
2153                          sdata->name, mgmt->sa, status_code);
2154                 ieee80211_destroy_assoc_data(sdata, false);
2155         } else {
2156                 pr_debug("%s: associated\n", sdata->name);
2157
2158                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2159                         /* oops -- internal error -- send timeout for now */
2160                         ieee80211_destroy_assoc_data(sdata, true);
2161                         sta_info_destroy_addr(sdata, mgmt->bssid);
2162                         cfg80211_put_bss(*bss);
2163                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2164                 }
2165
2166                 /*
2167                  * destroy assoc_data afterwards, as otherwise an idle
2168                  * recalc after assoc_data is NULL but before associated
2169                  * is set can cause the interface to go idle
2170                  */
2171                 ieee80211_destroy_assoc_data(sdata, true);
2172         }
2173
2174         return RX_MGMT_CFG80211_RX_ASSOC;
2175 }
2176 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2177                                   struct ieee80211_mgmt *mgmt,
2178                                   size_t len,
2179                                   struct ieee80211_rx_status *rx_status,
2180                                   struct ieee802_11_elems *elems,
2181                                   bool beacon)
2182 {
2183         struct ieee80211_local *local = sdata->local;
2184         int freq;
2185         struct ieee80211_bss *bss;
2186         struct ieee80211_channel *channel;
2187         bool need_ps = false;
2188
2189         if (sdata->u.mgd.associated &&
2190             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2191                 bss = (void *)sdata->u.mgd.associated->priv;
2192                 /* not previously set so we may need to recalc */
2193                 need_ps = !bss->dtim_period;
2194         }
2195
2196         if (elems->ds_params && elems->ds_params_len == 1)
2197                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2198                                                       rx_status->band);
2199         else
2200                 freq = rx_status->freq;
2201
2202         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2203
2204         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2205                 return;
2206
2207         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2208                                         channel, beacon);
2209         if (bss)
2210                 ieee80211_rx_bss_put(local, bss);
2211
2212         if (!sdata->u.mgd.associated)
2213                 return;
2214
2215         if (need_ps) {
2216                 mutex_lock(&local->iflist_mtx);
2217                 ieee80211_recalc_ps(local, -1);
2218                 mutex_unlock(&local->iflist_mtx);
2219         }
2220
2221         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
2222             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
2223                                                         ETH_ALEN) == 0)) {
2224                 struct ieee80211_channel_sw_ie *sw_elem =
2225                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
2226                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
2227                                                  bss, rx_status->mactime);
2228         }
2229 }
2230
2231
2232 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2233                                          struct sk_buff *skb)
2234 {
2235         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2236         struct ieee80211_if_managed *ifmgd;
2237         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2238         size_t baselen, len = skb->len;
2239         struct ieee802_11_elems elems;
2240
2241         ifmgd = &sdata->u.mgd;
2242
2243         ASSERT_MGD_MTX(ifmgd);
2244
2245         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2246                 return; /* ignore ProbeResp to foreign address */
2247
2248         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2249         if (baselen > len)
2250                 return;
2251
2252         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2253                                 &elems);
2254
2255         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2256
2257         if (ifmgd->associated &&
2258             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2259                 ieee80211_reset_ap_probe(sdata);
2260
2261         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2262             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2263                 /* got probe response, continue with auth */
2264                 pr_debug("%s: direct probe responded\n", sdata->name);
2265                 ifmgd->auth_data->tries = 0;
2266                 ifmgd->auth_data->timeout = jiffies;
2267                 run_again(ifmgd, ifmgd->auth_data->timeout);
2268         }
2269 }
2270
2271 /*
2272  * This is the canonical list of information elements we care about,
2273  * the filter code also gives us all changes to the Microsoft OUI
2274  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2275  *
2276  * We implement beacon filtering in software since that means we can
2277  * avoid processing the frame here and in cfg80211, and userspace
2278  * will not be able to tell whether the hardware supports it or not.
2279  *
2280  * XXX: This list needs to be dynamic -- userspace needs to be able to
2281  *      add items it requires. It also needs to be able to tell us to
2282  *      look out for other vendor IEs.
2283  */
2284 static const u64 care_about_ies =
2285         (1ULL << WLAN_EID_COUNTRY) |
2286         (1ULL << WLAN_EID_ERP_INFO) |
2287         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2288         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2289         (1ULL << WLAN_EID_HT_CAPABILITY) |
2290         (1ULL << WLAN_EID_HT_OPERATION);
2291
2292 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2293                                      struct ieee80211_mgmt *mgmt,
2294                                      size_t len,
2295                                      struct ieee80211_rx_status *rx_status)
2296 {
2297         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2298         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2299         size_t baselen;
2300         struct ieee802_11_elems elems;
2301         struct ieee80211_local *local = sdata->local;
2302         u32 changed = 0;
2303         bool erp_valid, directed_tim = false;
2304         u8 erp_value = 0;
2305         u32 ncrc;
2306         u8 *bssid;
2307
2308         lockdep_assert_held(&ifmgd->mtx);
2309
2310         /* Process beacon from the current BSS */
2311         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2312         if (baselen > len)
2313                 return;
2314
2315         if (rx_status->freq != local->hw.conf.channel->center_freq)
2316                 return;
2317
2318         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2319             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2320                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2321                                        len - baselen, &elems);
2322
2323                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2324                                       false);
2325                 ifmgd->assoc_data->have_beacon = true;
2326                 ifmgd->assoc_data->sent_assoc = false;
2327                 /* continue assoc process */
2328                 ifmgd->assoc_data->timeout = jiffies;
2329                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2330                 return;
2331         }
2332
2333         if (!ifmgd->associated ||
2334             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2335                 return;
2336         bssid = ifmgd->associated->bssid;
2337
2338         /* Track average RSSI from the Beacon frames of the current AP */
2339         ifmgd->last_beacon_signal = rx_status->signal;
2340         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2341                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2342                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2343                 ifmgd->last_cqm_event_signal = 0;
2344                 ifmgd->count_beacon_signal = 1;
2345                 ifmgd->last_ave_beacon_signal = 0;
2346         } else {
2347                 ifmgd->ave_beacon_signal =
2348                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2349                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2350                          ifmgd->ave_beacon_signal) / 16;
2351                 ifmgd->count_beacon_signal++;
2352         }
2353
2354         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2355             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2356                 int sig = ifmgd->ave_beacon_signal;
2357                 int last_sig = ifmgd->last_ave_beacon_signal;
2358
2359                 /*
2360                  * if signal crosses either of the boundaries, invoke callback
2361                  * with appropriate parameters
2362                  */
2363                 if (sig > ifmgd->rssi_max_thold &&
2364                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2365                         ifmgd->last_ave_beacon_signal = sig;
2366                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2367                 } else if (sig < ifmgd->rssi_min_thold &&
2368                            (last_sig >= ifmgd->rssi_max_thold ||
2369                            last_sig == 0)) {
2370                         ifmgd->last_ave_beacon_signal = sig;
2371                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2372                 }
2373         }
2374
2375         if (bss_conf->cqm_rssi_thold &&
2376             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2377             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2378                 int sig = ifmgd->ave_beacon_signal / 16;
2379                 int last_event = ifmgd->last_cqm_event_signal;
2380                 int thold = bss_conf->cqm_rssi_thold;
2381                 int hyst = bss_conf->cqm_rssi_hyst;
2382                 if (sig < thold &&
2383                     (last_event == 0 || sig < last_event - hyst)) {
2384                         ifmgd->last_cqm_event_signal = sig;
2385                         ieee80211_cqm_rssi_notify(
2386                                 &sdata->vif,
2387                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2388                                 GFP_KERNEL);
2389                 } else if (sig > thold &&
2390                            (last_event == 0 || sig > last_event + hyst)) {
2391                         ifmgd->last_cqm_event_signal = sig;
2392                         ieee80211_cqm_rssi_notify(
2393                                 &sdata->vif,
2394                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2395                                 GFP_KERNEL);
2396                 }
2397         }
2398
2399         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2400 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2401                 net_dbg_ratelimited("%s: cancelling probereq poll due to a received beacon\n",
2402                                     sdata->name);
2403 #endif
2404                 mutex_lock(&local->mtx);
2405                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2406                 ieee80211_run_deferred_scan(local);
2407                 mutex_unlock(&local->mtx);
2408
2409                 mutex_lock(&local->iflist_mtx);
2410                 ieee80211_recalc_ps(local, -1);
2411                 mutex_unlock(&local->iflist_mtx);
2412         }
2413
2414         /*
2415          * Push the beacon loss detection into the future since
2416          * we are processing a beacon from the AP just now.
2417          */
2418         ieee80211_sta_reset_beacon_monitor(sdata);
2419
2420         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2421         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2422                                           len - baselen, &elems,
2423                                           care_about_ies, ncrc);
2424
2425         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2426                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2427                                                    ifmgd->aid);
2428
2429         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
2430                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2431                                       true);
2432
2433                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2434                                          elems.wmm_param_len);
2435         }
2436
2437         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2438                 if (directed_tim) {
2439                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2440                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2441                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2442                                         ieee80211_hw_config(local,
2443                                                             IEEE80211_CONF_CHANGE_PS);
2444                                 }
2445                                 ieee80211_send_nullfunc(local, sdata, 0);
2446                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2447                                 local->pspolling = true;
2448
2449                                 /*
2450                                  * Here is assumed that the driver will be
2451                                  * able to send ps-poll frame and receive a
2452                                  * response even though power save mode is
2453                                  * enabled, but some drivers might require
2454                                  * to disable power save here. This needs
2455                                  * to be investigated.
2456                                  */
2457                                 ieee80211_send_pspoll(local, sdata);
2458                         }
2459                 }
2460         }
2461
2462         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2463                 return;
2464         ifmgd->beacon_crc = ncrc;
2465         ifmgd->beacon_crc_valid = true;
2466
2467         if (elems.erp_info && elems.erp_info_len >= 1) {
2468                 erp_valid = true;
2469                 erp_value = elems.erp_info[0];
2470         } else {
2471                 erp_valid = false;
2472         }
2473         changed |= ieee80211_handle_bss_capability(sdata,
2474                         le16_to_cpu(mgmt->u.beacon.capab_info),
2475                         erp_valid, erp_value);
2476
2477
2478         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2479             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2480                 struct ieee80211_supported_band *sband;
2481
2482                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2483
2484                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2485                                                   bssid, true);
2486         }
2487
2488         /* Note: country IE parsing is done for us by cfg80211 */
2489         if (elems.country_elem) {
2490                 /* TODO: IBSS also needs this */
2491                 if (elems.pwr_constr_elem)
2492                         ieee80211_handle_pwr_constr(sdata,
2493                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2494                                 elems.pwr_constr_elem,
2495                                 elems.pwr_constr_elem_len);
2496         }
2497
2498         ieee80211_bss_info_change_notify(sdata, changed);
2499 }
2500
2501 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2502                                   struct sk_buff *skb)
2503 {
2504         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2505         struct ieee80211_rx_status *rx_status;
2506         struct ieee80211_mgmt *mgmt;
2507         struct cfg80211_bss *bss = NULL;
2508         enum rx_mgmt_action rma = RX_MGMT_NONE;
2509         u16 fc;
2510
2511         rx_status = (struct ieee80211_rx_status *) skb->cb;
2512         mgmt = (struct ieee80211_mgmt *) skb->data;
2513         fc = le16_to_cpu(mgmt->frame_control);
2514
2515         mutex_lock(&ifmgd->mtx);
2516
2517         switch (fc & IEEE80211_FCTL_STYPE) {
2518         case IEEE80211_STYPE_BEACON:
2519                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2520                 break;
2521         case IEEE80211_STYPE_PROBE_RESP:
2522                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2523                 break;
2524         case IEEE80211_STYPE_AUTH:
2525                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2526                 break;
2527         case IEEE80211_STYPE_DEAUTH:
2528                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2529                 break;
2530         case IEEE80211_STYPE_DISASSOC:
2531                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2532                 break;
2533         case IEEE80211_STYPE_ASSOC_RESP:
2534         case IEEE80211_STYPE_REASSOC_RESP:
2535                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2536                 break;
2537         case IEEE80211_STYPE_ACTION:
2538                 switch (mgmt->u.action.category) {
2539                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2540                         ieee80211_sta_process_chanswitch(sdata,
2541                                         &mgmt->u.action.u.chan_switch.sw_elem,
2542                                         (void *)ifmgd->associated->priv,
2543                                         rx_status->mactime);
2544                         break;
2545                 }
2546         }
2547         mutex_unlock(&ifmgd->mtx);
2548
2549         switch (rma) {
2550         case RX_MGMT_NONE:
2551                 /* no action */
2552                 break;
2553         case RX_MGMT_CFG80211_DEAUTH:
2554                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2555                 break;
2556         case RX_MGMT_CFG80211_DISASSOC:
2557                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2558                 break;
2559         case RX_MGMT_CFG80211_RX_AUTH:
2560                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2561                 break;
2562         case RX_MGMT_CFG80211_RX_ASSOC:
2563                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2564                 break;
2565         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2566                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2567                 break;
2568         default:
2569                 WARN(1, "unexpected: %d", rma);
2570         }
2571 }
2572
2573 static void ieee80211_sta_timer(unsigned long data)
2574 {
2575         struct ieee80211_sub_if_data *sdata =
2576                 (struct ieee80211_sub_if_data *) data;
2577         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2578         struct ieee80211_local *local = sdata->local;
2579
2580         if (local->quiescing) {
2581                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2582                 return;
2583         }
2584
2585         ieee80211_queue_work(&local->hw, &sdata->work);
2586 }
2587
2588 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2589                                           u8 *bssid, u8 reason)
2590 {
2591         struct ieee80211_local *local = sdata->local;
2592         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2593         u8 frame_buf[DEAUTH_DISASSOC_LEN];
2594
2595         ieee80211_stop_poll(sdata);
2596
2597         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2598                                false, frame_buf);
2599         mutex_unlock(&ifmgd->mtx);
2600
2601         /*
2602          * must be outside lock due to cfg80211,
2603          * but that's not a problem.
2604          */
2605         cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
2606
2607         mutex_lock(&local->mtx);
2608         ieee80211_recalc_idle(local);
2609         mutex_unlock(&local->mtx);
2610
2611         mutex_lock(&ifmgd->mtx);
2612 }
2613
2614 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2615 {
2616         struct ieee80211_local *local = sdata->local;
2617         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2618         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2619
2620         lockdep_assert_held(&ifmgd->mtx);
2621
2622         if (WARN_ON_ONCE(!auth_data))
2623                 return -EINVAL;
2624
2625         auth_data->tries++;
2626
2627         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2628                 pr_debug("%s: authentication with %pM timed out\n",
2629                          sdata->name, auth_data->bss->bssid);
2630
2631                 /*
2632                  * Most likely AP is not in the range so remove the
2633                  * bss struct for that AP.
2634                  */
2635                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2636
2637                 return -ETIMEDOUT;
2638         }
2639
2640         if (auth_data->bss->proberesp_ies) {
2641                 pr_debug("%s: send auth to %pM (try %d/%d)\n",
2642                          sdata->name, auth_data->bss->bssid, auth_data->tries,
2643                          IEEE80211_AUTH_MAX_TRIES);
2644
2645                 auth_data->expected_transaction = 2;
2646                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2647                                     auth_data->ie, auth_data->ie_len,
2648                                     auth_data->bss->bssid,
2649                                     auth_data->bss->bssid, NULL, 0, 0);
2650         } else {
2651                 const u8 *ssidie;
2652
2653                 pr_debug("%s: direct probe to %pM (try %d/%i)\n",
2654                          sdata->name, auth_data->bss->bssid, auth_data->tries,
2655                          IEEE80211_AUTH_MAX_TRIES);
2656
2657                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2658                 if (!ssidie)
2659                         return -EINVAL;
2660                 /*
2661                  * Direct probe is sent to broadcast address as some APs
2662                  * will not answer to direct packet in unassociated state.
2663                  */
2664                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2665                                          NULL, 0, (u32) -1, true, false);
2666         }
2667
2668         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2669         run_again(ifmgd, auth_data->timeout);
2670
2671         return 0;
2672 }
2673
2674 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2675 {
2676         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2677         struct ieee80211_local *local = sdata->local;
2678
2679         lockdep_assert_held(&sdata->u.mgd.mtx);
2680
2681         assoc_data->tries++;
2682         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2683                 pr_debug("%s: association with %pM timed out\n",
2684                          sdata->name, assoc_data->bss->bssid);
2685
2686                 /*
2687                  * Most likely AP is not in the range so remove the
2688                  * bss struct for that AP.
2689                  */
2690                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2691
2692                 return -ETIMEDOUT;
2693         }
2694
2695         pr_debug("%s: associate with %pM (try %d/%d)\n",
2696                  sdata->name, assoc_data->bss->bssid, assoc_data->tries,
2697                  IEEE80211_ASSOC_MAX_TRIES);
2698         ieee80211_send_assoc(sdata);
2699
2700         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2701         run_again(&sdata->u.mgd, assoc_data->timeout);
2702
2703         return 0;
2704 }
2705
2706 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2707 {
2708         struct ieee80211_local *local = sdata->local;
2709         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2710
2711         mutex_lock(&ifmgd->mtx);
2712
2713         if (ifmgd->auth_data &&
2714             time_after(jiffies, ifmgd->auth_data->timeout)) {
2715                 if (ifmgd->auth_data->done) {
2716                         /*
2717                          * ok ... we waited for assoc but userspace didn't,
2718                          * so let's just kill the auth data
2719                          */
2720                         ieee80211_destroy_auth_data(sdata, false);
2721                 } else if (ieee80211_probe_auth(sdata)) {
2722                         u8 bssid[ETH_ALEN];
2723
2724                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2725
2726                         ieee80211_destroy_auth_data(sdata, false);
2727
2728                         mutex_unlock(&ifmgd->mtx);
2729                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2730                         mutex_lock(&ifmgd->mtx);
2731                 }
2732         } else if (ifmgd->auth_data)
2733                 run_again(ifmgd, ifmgd->auth_data->timeout);
2734
2735         if (ifmgd->assoc_data &&
2736             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2737                 if (!ifmgd->assoc_data->have_beacon ||
2738                     ieee80211_do_assoc(sdata)) {
2739                         u8 bssid[ETH_ALEN];
2740
2741                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2742
2743                         ieee80211_destroy_assoc_data(sdata, false);
2744
2745                         mutex_unlock(&ifmgd->mtx);
2746                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2747                         mutex_lock(&ifmgd->mtx);
2748                 }
2749         } else if (ifmgd->assoc_data)
2750                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2751
2752         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2753                             IEEE80211_STA_CONNECTION_POLL) &&
2754             ifmgd->associated) {
2755                 u8 bssid[ETH_ALEN];
2756                 int max_tries;
2757
2758                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2759
2760                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2761                         max_tries = max_nullfunc_tries;
2762                 else
2763                         max_tries = max_probe_tries;
2764
2765                 /* ACK received for nullfunc probing frame */
2766                 if (!ifmgd->probe_send_count)
2767                         ieee80211_reset_ap_probe(sdata);
2768                 else if (ifmgd->nullfunc_failed) {
2769                         if (ifmgd->probe_send_count < max_tries) {
2770 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2771                                 wiphy_debug(local->hw.wiphy,
2772                                             "%s: No ack for nullfunc frame to"
2773                                             " AP %pM, try %d/%i\n",
2774                                             sdata->name, bssid,
2775                                             ifmgd->probe_send_count, max_tries);
2776 #endif
2777                                 ieee80211_mgd_probe_ap_send(sdata);
2778                         } else {
2779 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2780                                 wiphy_debug(local->hw.wiphy,
2781                                             "%s: No ack for nullfunc frame to"
2782                                             " AP %pM, disconnecting.\n",
2783                                             sdata->name, bssid);
2784 #endif
2785                                 ieee80211_sta_connection_lost(sdata, bssid,
2786                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2787                         }
2788                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2789                         run_again(ifmgd, ifmgd->probe_timeout);
2790                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2791 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2792                         wiphy_debug(local->hw.wiphy,
2793                                     "%s: Failed to send nullfunc to AP %pM"
2794                                     " after %dms, disconnecting.\n",
2795                                     sdata->name,
2796                                     bssid, probe_wait_ms);
2797 #endif
2798                         ieee80211_sta_connection_lost(sdata, bssid,
2799                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2800                 } else if (ifmgd->probe_send_count < max_tries) {
2801 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2802                         wiphy_debug(local->hw.wiphy,
2803                                     "%s: No probe response from AP %pM"
2804                                     " after %dms, try %d/%i\n",
2805                                     sdata->name,
2806                                     bssid, probe_wait_ms,
2807                                     ifmgd->probe_send_count, max_tries);
2808 #endif
2809                         ieee80211_mgd_probe_ap_send(sdata);
2810                 } else {
2811                         /*
2812                          * We actually lost the connection ... or did we?
2813                          * Let's make sure!
2814                          */
2815                         wiphy_debug(local->hw.wiphy,
2816                                     "%s: No probe response from AP %pM"
2817                                     " after %dms, disconnecting.\n",
2818                                     sdata->name,
2819                                     bssid, probe_wait_ms);
2820
2821                         ieee80211_sta_connection_lost(sdata, bssid,
2822                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2823                 }
2824         }
2825
2826         mutex_unlock(&ifmgd->mtx);
2827
2828         mutex_lock(&local->mtx);
2829         ieee80211_recalc_idle(local);
2830         mutex_unlock(&local->mtx);
2831 }
2832
2833 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2834 {
2835         struct ieee80211_sub_if_data *sdata =
2836                 (struct ieee80211_sub_if_data *) data;
2837         struct ieee80211_local *local = sdata->local;
2838
2839         if (local->quiescing)
2840                 return;
2841
2842         ieee80211_queue_work(&sdata->local->hw,
2843                              &sdata->u.mgd.beacon_connection_loss_work);
2844 }
2845
2846 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2847 {
2848         struct ieee80211_sub_if_data *sdata =
2849                 (struct ieee80211_sub_if_data *) data;
2850         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2851         struct ieee80211_local *local = sdata->local;
2852
2853         if (local->quiescing)
2854                 return;
2855
2856         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2857 }
2858
2859 static void ieee80211_sta_monitor_work(struct work_struct *work)
2860 {
2861         struct ieee80211_sub_if_data *sdata =
2862                 container_of(work, struct ieee80211_sub_if_data,
2863                              u.mgd.monitor_work);
2864
2865         ieee80211_mgd_probe_ap(sdata, false);
2866 }
2867
2868 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2869 {
2870         u32 flags;
2871
2872         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2873                 __ieee80211_stop_poll(sdata);
2874
2875                 /* let's probe the connection once */
2876                 flags = sdata->local->hw.flags;
2877                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2878                         ieee80211_queue_work(&sdata->local->hw,
2879                                              &sdata->u.mgd.monitor_work);
2880                 /* and do all the other regular work too */
2881                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2882         }
2883 }
2884
2885 #ifdef CONFIG_PM
2886 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2887 {
2888         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2889
2890         /*
2891          * we need to use atomic bitops for the running bits
2892          * only because both timers might fire at the same
2893          * time -- the code here is properly synchronised.
2894          */
2895
2896         cancel_work_sync(&ifmgd->request_smps_work);
2897
2898         cancel_work_sync(&ifmgd->monitor_work);
2899         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2900         if (del_timer_sync(&ifmgd->timer))
2901                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2902
2903         cancel_work_sync(&ifmgd->chswitch_work);
2904         if (del_timer_sync(&ifmgd->chswitch_timer))
2905                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2906
2907         /* these will just be re-established on connection */
2908         del_timer_sync(&ifmgd->conn_mon_timer);
2909         del_timer_sync(&ifmgd->bcn_mon_timer);
2910 }
2911
2912 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2913 {
2914         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2915
2916         if (!ifmgd->associated)
2917                 return;
2918
2919         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2920                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2921                 mutex_lock(&ifmgd->mtx);
2922                 if (ifmgd->associated) {
2923 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2924                         wiphy_debug(sdata->local->hw.wiphy,
2925                                     "%s: driver requested disconnect after resume.\n",
2926                                     sdata->name);
2927 #endif
2928                         ieee80211_sta_connection_lost(sdata,
2929                                 ifmgd->associated->bssid,
2930                                 WLAN_REASON_UNSPECIFIED);
2931                         mutex_unlock(&ifmgd->mtx);
2932                         return;
2933                 }
2934                 mutex_unlock(&ifmgd->mtx);
2935         }
2936
2937         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2938                 add_timer(&ifmgd->timer);
2939         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2940                 add_timer(&ifmgd->chswitch_timer);
2941         ieee80211_sta_reset_beacon_monitor(sdata);
2942
2943         mutex_lock(&sdata->local->mtx);
2944         ieee80211_restart_sta_timer(sdata);
2945         mutex_unlock(&sdata->local->mtx);
2946 }
2947 #endif
2948
2949 /* interface setup */
2950 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2951 {
2952         struct ieee80211_if_managed *ifmgd;
2953
2954         ifmgd = &sdata->u.mgd;
2955         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2956         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2957         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2958                   ieee80211_beacon_connection_loss_work);
2959         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2960         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2961                     (unsigned long) sdata);
2962         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2963                     (unsigned long) sdata);
2964         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2965                     (unsigned long) sdata);
2966         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2967                     (unsigned long) sdata);
2968
2969         ifmgd->flags = 0;
2970         ifmgd->powersave = sdata->wdev.ps;
2971         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
2972         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
2973
2974         mutex_init(&ifmgd->mtx);
2975
2976         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2977                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2978         else
2979                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2980 }
2981
2982 /* scan finished notification */
2983 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2984 {
2985         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2986
2987         /* Restart STA timers */
2988         rcu_read_lock();
2989         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2990                 ieee80211_restart_sta_timer(sdata);
2991         rcu_read_unlock();
2992 }
2993
2994 int ieee80211_max_network_latency(struct notifier_block *nb,
2995                                   unsigned long data, void *dummy)
2996 {
2997         s32 latency_usec = (s32) data;
2998         struct ieee80211_local *local =
2999                 container_of(nb, struct ieee80211_local,
3000                              network_latency_notifier);
3001
3002         mutex_lock(&local->iflist_mtx);
3003         ieee80211_recalc_ps(local, latency_usec);
3004         mutex_unlock(&local->iflist_mtx);
3005
3006         return 0;
3007 }
3008
3009 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3010                                      struct cfg80211_bss *cbss, bool assoc)
3011 {
3012         struct ieee80211_local *local = sdata->local;
3013         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3014         struct ieee80211_bss *bss = (void *)cbss->priv;
3015         struct sta_info *sta = NULL;
3016         bool have_sta = false;
3017         int err;
3018         int ht_cfreq;
3019         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3020         const u8 *ht_oper_ie;
3021         const struct ieee80211_ht_operation *ht_oper = NULL;
3022         struct ieee80211_supported_band *sband;
3023
3024         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3025                 return -EINVAL;
3026
3027         if (assoc) {
3028                 rcu_read_lock();
3029                 have_sta = sta_info_get(sdata, cbss->bssid);
3030                 rcu_read_unlock();
3031         }
3032
3033         if (!have_sta) {
3034                 sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3035                 if (!sta)
3036                         return -ENOMEM;
3037         }
3038
3039         mutex_lock(&local->mtx);
3040         ieee80211_recalc_idle(sdata->local);
3041         mutex_unlock(&local->mtx);
3042
3043         /* switch to the right channel */
3044         sband = local->hw.wiphy->bands[cbss->channel->band];
3045
3046         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3047
3048         if (sband->ht_cap.ht_supported) {
3049                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3050                                               cbss->information_elements,
3051                                               cbss->len_information_elements);
3052                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3053                         ht_oper = (void *)(ht_oper_ie + 2);
3054         }
3055
3056         if (ht_oper) {
3057                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3058                                                           cbss->channel->band);
3059                 /* check that channel matches the right operating channel */
3060                 if (cbss->channel->center_freq != ht_cfreq) {
3061                         /*
3062                          * It's possible that some APs are confused here;
3063                          * Netgear WNDR3700 sometimes reports 4 higher than
3064                          * the actual channel in association responses, but
3065                          * since we look at probe response/beacon data here
3066                          * it should be OK.
3067                          */
3068                         pr_debug("%s: Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3069                                  sdata->name, cbss->channel->center_freq,
3070                                  ht_cfreq, ht_oper->primary_chan,
3071                                  cbss->channel->band);
3072                         ht_oper = NULL;
3073                 }
3074         }
3075
3076         if (ht_oper) {
3077                 channel_type = NL80211_CHAN_HT20;
3078
3079                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3080                         switch (ht_oper->ht_param &
3081                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3082                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3083                                 channel_type = NL80211_CHAN_HT40PLUS;
3084                                 break;
3085                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3086                                 channel_type = NL80211_CHAN_HT40MINUS;
3087                                 break;
3088                         }
3089                 }
3090         }
3091
3092         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3093                 /* can only fail due to HT40+/- mismatch */
3094                 channel_type = NL80211_CHAN_HT20;
3095                 pr_debug("%s: disabling 40 MHz due to multi-vif mismatch\n",
3096                          sdata->name);
3097                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3098                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3099                                                     channel_type));
3100         }
3101
3102         local->oper_channel = cbss->channel;
3103         ieee80211_hw_config(local, 0);
3104
3105         if (sta) {
3106                 u32 rates = 0, basic_rates = 0;
3107                 bool have_higher_than_11mbit;
3108                 int min_rate = INT_MAX, min_rate_index = -1;
3109
3110                 ieee80211_get_rates(sband, bss->supp_rates,
3111                                     bss->supp_rates_len,
3112                                     &rates, &basic_rates,
3113                                     &have_higher_than_11mbit,
3114                                     &min_rate, &min_rate_index);
3115
3116                 /*
3117                  * This used to be a workaround for basic rates missing
3118                  * in the association response frame. Now that we no
3119                  * longer use the basic rates from there, it probably
3120                  * doesn't happen any more, but keep the workaround so
3121                  * in case some *other* APs are buggy in different ways
3122                  * we can connect -- with a warning.
3123                  */
3124                 if (!basic_rates && min_rate_index >= 0) {
3125                         pr_debug("%s: No basic rates, using min rate instead\n",
3126                                  sdata->name);
3127                         basic_rates = BIT(min_rate_index);
3128                 }
3129
3130                 sta->sta.supp_rates[cbss->channel->band] = rates;
3131                 sdata->vif.bss_conf.basic_rates = basic_rates;
3132
3133                 /* cf. IEEE 802.11 9.2.12 */
3134                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3135                     have_higher_than_11mbit)
3136                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3137                 else
3138                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3139
3140                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3141
3142                 /* tell driver about BSSID and basic rates */
3143                 ieee80211_bss_info_change_notify(sdata,
3144                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES);
3145
3146                 if (assoc)
3147                         sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
3148
3149                 err = sta_info_insert(sta);
3150                 sta = NULL;
3151                 if (err) {
3152                         pr_debug("%s: failed to insert STA entry for the AP (error %d)\n",
3153                                  sdata->name, err);
3154                         return err;
3155                 }
3156         } else
3157                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3158
3159         return 0;
3160 }
3161
3162 /* config hooks */
3163 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3164                        struct cfg80211_auth_request *req)
3165 {
3166         struct ieee80211_local *local = sdata->local;
3167         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3168         struct ieee80211_mgd_auth_data *auth_data;
3169         u16 auth_alg;
3170         int err;
3171
3172         /* prepare auth data structure */
3173
3174         switch (req->auth_type) {
3175         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3176                 auth_alg = WLAN_AUTH_OPEN;
3177                 break;
3178         case NL80211_AUTHTYPE_SHARED_KEY:
3179                 if (IS_ERR(local->wep_tx_tfm))
3180                         return -EOPNOTSUPP;
3181                 auth_alg = WLAN_AUTH_SHARED_KEY;
3182                 break;
3183         case NL80211_AUTHTYPE_FT:
3184                 auth_alg = WLAN_AUTH_FT;
3185                 break;
3186         case NL80211_AUTHTYPE_NETWORK_EAP:
3187                 auth_alg = WLAN_AUTH_LEAP;
3188                 break;
3189         default:
3190                 return -EOPNOTSUPP;
3191         }
3192
3193         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3194         if (!auth_data)
3195                 return -ENOMEM;
3196
3197         auth_data->bss = req->bss;
3198
3199         if (req->ie && req->ie_len) {
3200                 memcpy(auth_data->ie, req->ie, req->ie_len);
3201                 auth_data->ie_len = req->ie_len;
3202         }
3203
3204         if (req->key && req->key_len) {
3205                 auth_data->key_len = req->key_len;
3206                 auth_data->key_idx = req->key_idx;
3207                 memcpy(auth_data->key, req->key, req->key_len);
3208         }
3209
3210         auth_data->algorithm = auth_alg;
3211
3212         /* try to authenticate/probe */
3213
3214         mutex_lock(&ifmgd->mtx);
3215
3216         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3217             ifmgd->assoc_data) {
3218                 err = -EBUSY;
3219                 goto err_free;
3220         }
3221
3222         if (ifmgd->auth_data)
3223                 ieee80211_destroy_auth_data(sdata, false);
3224
3225         /* prep auth_data so we don't go into idle on disassoc */
3226         ifmgd->auth_data = auth_data;
3227
3228         if (ifmgd->associated)
3229                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3230
3231         pr_debug("%s: authenticate with %pM\n", sdata->name, req->bss->bssid);
3232
3233         err = ieee80211_prep_connection(sdata, req->bss, false);
3234         if (err)
3235                 goto err_clear;
3236
3237         err = ieee80211_probe_auth(sdata);
3238         if (err) {
3239                 sta_info_destroy_addr(sdata, req->bss->bssid);
3240                 goto err_clear;
3241         }
3242
3243         /* hold our own reference */
3244         cfg80211_ref_bss(auth_data->bss);
3245         err = 0;
3246         goto out_unlock;
3247
3248  err_clear:
3249         ifmgd->auth_data = NULL;
3250  err_free:
3251         kfree(auth_data);
3252  out_unlock:
3253         mutex_unlock(&ifmgd->mtx);
3254
3255         return err;
3256 }
3257
3258 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3259                         struct cfg80211_assoc_request *req)
3260 {
3261         struct ieee80211_local *local = sdata->local;
3262         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3263         struct ieee80211_bss *bss = (void *)req->bss->priv;
3264         struct ieee80211_mgd_assoc_data *assoc_data;
3265         struct ieee80211_supported_band *sband;
3266         const u8 *ssidie, *ht_ie;
3267         int i, err;
3268
3269         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3270         if (!ssidie)
3271                 return -EINVAL;
3272
3273         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3274         if (!assoc_data)
3275                 return -ENOMEM;
3276
3277         mutex_lock(&ifmgd->mtx);
3278
3279         if (ifmgd->associated)
3280                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3281
3282         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3283                 err = -EBUSY;
3284                 goto err_free;
3285         }
3286
3287         if (ifmgd->assoc_data) {
3288                 err = -EBUSY;
3289                 goto err_free;
3290         }
3291
3292         if (ifmgd->auth_data) {
3293                 bool match;
3294
3295                 /* keep sta info, bssid if matching */
3296                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3297                 ieee80211_destroy_auth_data(sdata, match);
3298         }
3299
3300         /* prepare assoc data */
3301
3302         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
3303         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
3304
3305         ifmgd->beacon_crc_valid = false;
3306
3307         /*
3308          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3309          * We still associate in non-HT mode (11a/b/g) if any one of these
3310          * ciphers is configured as pairwise.
3311          * We can set this to true for non-11n hardware, that'll be checked
3312          * separately along with the peer capabilities.
3313          */
3314         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3315                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3316                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3317                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3318                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3319                         netdev_info(sdata->dev,
3320                                     "disabling HT due to WEP/TKIP use\n");
3321                 }
3322         }
3323
3324         if (req->flags & ASSOC_REQ_DISABLE_HT)
3325                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3326
3327         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3328         sband = local->hw.wiphy->bands[req->bss->channel->band];
3329         if (!sband->ht_cap.ht_supported ||
3330             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3331                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3332                 netdev_info(sdata->dev,
3333                             "disabling HT as WMM/QoS is not supported\n");
3334         }
3335
3336         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3337         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3338                sizeof(ifmgd->ht_capa_mask));
3339
3340         if (req->ie && req->ie_len) {
3341                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3342                 assoc_data->ie_len = req->ie_len;
3343         }
3344
3345         assoc_data->bss = req->bss;
3346
3347         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3348                 if (ifmgd->powersave)
3349                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3350                 else
3351                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3352         } else
3353                 ifmgd->ap_smps = ifmgd->req_smps;
3354
3355         assoc_data->capability = req->bss->capability;
3356         assoc_data->wmm = bss->wmm_used &&
3357                           (local->hw.queues >= IEEE80211_NUM_ACS);
3358         assoc_data->supp_rates = bss->supp_rates;
3359         assoc_data->supp_rates_len = bss->supp_rates_len;
3360
3361         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3362         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3363                 assoc_data->ap_ht_param =
3364                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3365         else
3366                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3367
3368         if (bss->wmm_used && bss->uapsd_supported &&
3369             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3370                 assoc_data->uapsd = true;
3371                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3372         } else {
3373                 assoc_data->uapsd = false;
3374                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3375         }
3376
3377         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3378         assoc_data->ssid_len = ssidie[1];
3379
3380         if (req->prev_bssid)
3381                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3382
3383         if (req->use_mfp) {
3384                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3385                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3386         } else {
3387                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3388                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3389         }
3390
3391         if (req->crypto.control_port)
3392                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3393         else
3394                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3395
3396         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3397         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3398
3399         /* kick off associate process */
3400
3401         ifmgd->assoc_data = assoc_data;
3402
3403         err = ieee80211_prep_connection(sdata, req->bss, true);
3404         if (err)
3405                 goto err_clear;
3406
3407         if (!bss->dtim_period &&
3408             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3409                 /*
3410                  * Wait up to one beacon interval ...
3411                  * should this be more if we miss one?
3412                  */
3413                 pr_debug("%s: waiting for beacon from %pM\n",
3414                          sdata->name, ifmgd->bssid);
3415                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3416         } else {
3417                 assoc_data->have_beacon = true;
3418                 assoc_data->sent_assoc = false;
3419                 assoc_data->timeout = jiffies;
3420         }
3421         run_again(ifmgd, assoc_data->timeout);
3422
3423         if (bss->corrupt_data) {
3424                 char *corrupt_type = "data";
3425                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3426                         if (bss->corrupt_data &
3427                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3428                                 corrupt_type = "beacon and probe response";
3429                         else
3430                                 corrupt_type = "beacon";
3431                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3432                         corrupt_type = "probe response";
3433                 pr_debug("%s: associating with AP with corrupt %s\n",
3434                          sdata->name, corrupt_type);
3435         }
3436
3437         err = 0;
3438         goto out;
3439  err_clear:
3440         ifmgd->assoc_data = NULL;
3441  err_free:
3442         kfree(assoc_data);
3443  out:
3444         mutex_unlock(&ifmgd->mtx);
3445
3446         return err;
3447 }
3448
3449 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3450                          struct cfg80211_deauth_request *req)
3451 {
3452         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3453         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3454
3455         mutex_lock(&ifmgd->mtx);
3456
3457         if (ifmgd->auth_data) {
3458                 ieee80211_destroy_auth_data(sdata, false);
3459                 mutex_unlock(&ifmgd->mtx);
3460                 return 0;
3461         }
3462
3463         pr_debug("%s: deauthenticating from %pM by local choice (reason=%d)\n",
3464                  sdata->name, req->bssid, req->reason_code);
3465
3466         if (ifmgd->associated &&
3467             ether_addr_equal(ifmgd->associated->bssid, req->bssid))
3468                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3469                                        req->reason_code, true, frame_buf);
3470         else
3471                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3472                                                IEEE80211_STYPE_DEAUTH,
3473                                                req->reason_code, true,
3474                                                frame_buf);
3475         mutex_unlock(&ifmgd->mtx);
3476
3477         __cfg80211_send_deauth(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3478
3479         mutex_lock(&sdata->local->mtx);
3480         ieee80211_recalc_idle(sdata->local);
3481         mutex_unlock(&sdata->local->mtx);
3482
3483         return 0;
3484 }
3485
3486 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3487                            struct cfg80211_disassoc_request *req)
3488 {
3489         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3490         u8 bssid[ETH_ALEN];
3491         u8 frame_buf[DEAUTH_DISASSOC_LEN];
3492
3493         mutex_lock(&ifmgd->mtx);
3494
3495         /*
3496          * cfg80211 should catch this ... but it's racy since
3497          * we can receive a disassoc frame, process it, hand it
3498          * to cfg80211 while that's in a locked section already
3499          * trying to tell us that the user wants to disconnect.
3500          */
3501         if (ifmgd->associated != req->bss) {
3502                 mutex_unlock(&ifmgd->mtx);
3503                 return -ENOLINK;
3504         }
3505
3506         pr_debug("%s: disassociating from %pM by local choice (reason=%d)\n",
3507                  sdata->name, req->bss->bssid, req->reason_code);
3508
3509         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3510         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3511                                req->reason_code, !req->local_state_change,
3512                                frame_buf);
3513         mutex_unlock(&ifmgd->mtx);
3514
3515         __cfg80211_send_disassoc(sdata->dev, frame_buf, DEAUTH_DISASSOC_LEN);
3516
3517         mutex_lock(&sdata->local->mtx);
3518         ieee80211_recalc_idle(sdata->local);
3519         mutex_unlock(&sdata->local->mtx);
3520
3521         return 0;
3522 }
3523
3524 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3525 {
3526         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3527
3528         mutex_lock(&ifmgd->mtx);
3529         if (ifmgd->assoc_data)
3530                 ieee80211_destroy_assoc_data(sdata, false);
3531         if (ifmgd->auth_data)
3532                 ieee80211_destroy_auth_data(sdata, false);
3533         del_timer_sync(&ifmgd->timer);
3534         mutex_unlock(&ifmgd->mtx);
3535 }
3536
3537 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3538                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3539                                gfp_t gfp)
3540 {
3541         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3542
3543         trace_api_cqm_rssi_notify(sdata, rssi_event);
3544
3545         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3546 }
3547 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);