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 /*
  92  * All cfg80211 functions have to be called outside a locked
  93  * section so that they can acquire a lock themselves... This
  94  * is much simpler than queuing up things in cfg80211, but we
  95  * do need some indirection for that here.
  96  */
  97 enum rx_mgmt_action {
  98         /* no action required */
  99         RX_MGMT_NONE,
 100
 101         /* caller must call cfg80211_send_deauth() */
 102         RX_MGMT_CFG80211_DEAUTH,
 103
 104         /* caller must call cfg80211_send_disassoc() */
 105         RX_MGMT_CFG80211_DISASSOC,
 106
 107         /* caller must call cfg80211_send_rx_auth() */
 108         RX_MGMT_CFG80211_RX_AUTH,
 109
 110         /* caller must call cfg80211_send_rx_assoc() */
 111         RX_MGMT_CFG80211_RX_ASSOC,
 112
 113         /* caller must call cfg80211_send_assoc_timeout() */
 114         RX_MGMT_CFG80211_ASSOC_TIMEOUT,
 115 };
 116
 117 /* utils */
 118 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
 119 {
 120         lockdep_assert_held(&ifmgd->mtx);
 121 }
 122
 123 /*
 124  * We can have multiple work items (and connection probing)
 125  * scheduling this timer, but we need to take care to only
 126  * reschedule it when it should fire _earlier_ than it was
 127  * asked for before, or if it's not pending right now. This
 128  * function ensures that. Note that it then is required to
 129  * run this function for all timeouts after the first one
 130  * has happened -- the work that runs from this timer will
 131  * do that.
 132  */
 133 static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
 134 {
 135         ASSERT_MGD_MTX(ifmgd);
 136
 137         if (!timer_pending(&ifmgd->timer) ||
 138             time_before(timeout, ifmgd->timer.expires))
 139                 mod_timer(&ifmgd->timer, timeout);
 140 }
 141
 142 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
 143 {
 144         if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
 145                 return;
 146
 147         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 148                 return;
 149
 150         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 151                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
 152 }
 153
 154 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
 155 {
 156         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 157
 158         if (unlikely(!sdata->u.mgd.associated))
 159                 return;
 160
 161         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 162                 return;
 163
 164         mod_timer(&sdata->u.mgd.conn_mon_timer,
 165                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 166
 167         ifmgd->probe_send_count = 0;
 168 }
 169
 170 static int ecw2cw(int ecw)
 171 {
 172         return (1 << ecw) - 1;
 173 }
 174
 175 static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
 176                                   struct ieee80211_ht_operation *ht_oper,
 177                                   const u8 *bssid, bool reconfig)
 178 {
 179         struct ieee80211_local *local = sdata->local;
 180         struct ieee80211_supported_band *sband;
 181         struct sta_info *sta;
 182         u32 changed = 0;
 183         u16 ht_opmode;
 184         bool disable_40 = false;
 185
 186         sband = local->hw.wiphy->bands[local->oper_channel->band];
 187
 188         switch (sdata->vif.bss_conf.channel_type) {
 189         case NL80211_CHAN_HT40PLUS:
 190                 if (local->oper_channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
 191                         disable_40 = true;
 192                 break;
 193         case NL80211_CHAN_HT40MINUS:
 194                 if (local->oper_channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
 195                         disable_40 = true;
 196                 break;
 197         default:
 198                 break;
 199         }
 200
 201         /* This can change during the lifetime of the BSS */
 202         if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
 203                 disable_40 = true;
 204
 205         mutex_lock(&local->sta_mtx);
 206         sta = sta_info_get(sdata, bssid);
 207
 208         WARN_ON_ONCE(!sta);
 209
 210         if (sta && !sta->supports_40mhz)
 211                 disable_40 = true;
 212
 213         if (sta && (!reconfig ||
 214                     (disable_40 != !(sta->sta.ht_cap.cap &
 215                                         IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
 216
 217                 if (disable_40)
 218                         sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 219                 else
 220                         sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 221
 222                 rate_control_rate_update(local, sband, sta,
 223                                          IEEE80211_RC_BW_CHANGED);
 224         }
 225         mutex_unlock(&local->sta_mtx);
 226
 227         ht_opmode = le16_to_cpu(ht_oper->operation_mode);
 228
 229         /* if bss configuration changed store the new one */
 230         if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
 231                 changed |= BSS_CHANGED_HT;
 232                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 233         }
 234
 235         return changed;
 236 }
 237
 238 /* frame sending functions */
 239
 240 static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
 241                                       struct ieee80211_supported_band *sband,
 242                                       u32 *rates)
 243 {
 244         int i, j, count;
 245         *rates = 0;
 246         count = 0;
 247         for (i = 0; i < supp_rates_len; i++) {
 248                 int rate = (supp_rates[i] & 0x7F) * 5;
 249
 250                 for (j = 0; j < sband->n_bitrates; j++)
 251                         if (sband->bitrates[j].bitrate == rate) {
 252                                 *rates |= BIT(j);
 253                                 count++;
 254                                 break;
 255                         }
 256         }
 257
 258         return count;
 259 }
 260
 261 static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
 262                                 struct sk_buff *skb, u8 ap_ht_param,
 263                                 struct ieee80211_supported_band *sband,
 264                                 struct ieee80211_channel *channel,
 265                                 enum ieee80211_smps_mode smps)
 266 {
 267         u8 *pos;
 268         u32 flags = channel->flags;
 269         u16 cap;
 270         struct ieee80211_sta_ht_cap ht_cap;
 271
 272         BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
 273
 274         memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
 275         ieee80211_apply_htcap_overrides(sdata, &ht_cap);
 276
 277         /* determine capability flags */
 278         cap = ht_cap.cap;
 279
 280         switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 281         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 282                 if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
 283                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 284                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 285                 }
 286                 break;
 287         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 288                 if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
 289                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 290                         cap &= ~IEEE80211_HT_CAP_SGI_40;
 291                 }
 292                 break;
 293         }
 294
 295         /*
 296          * If 40 MHz was disabled associate as though we weren't
 297          * capable of 40 MHz -- some broken APs will never fall
 298          * back to trying to transmit in 20 MHz.
 299          */
 300         if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
 301                 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 302                 cap &= ~IEEE80211_HT_CAP_SGI_40;
 303         }
 304
 305         /* set SM PS mode properly */
 306         cap &= ~IEEE80211_HT_CAP_SM_PS;
 307         switch (smps) {
 308         case IEEE80211_SMPS_AUTOMATIC:
 309         case IEEE80211_SMPS_NUM_MODES:
 310                 WARN_ON(1);
 311         case IEEE80211_SMPS_OFF:
 312                 cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
 313                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 314                 break;
 315         case IEEE80211_SMPS_STATIC:
 316                 cap |= WLAN_HT_CAP_SM_PS_STATIC <<
 317                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 318                 break;
 319         case IEEE80211_SMPS_DYNAMIC:
 320                 cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
 321                         IEEE80211_HT_CAP_SM_PS_SHIFT;
 322                 break;
 323         }
 324
 325         /* reserve and fill IE */
 326         pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
 327         ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
 328 }
 329
 330 static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 331                                  struct sk_buff *skb,
 332                                  struct ieee80211_supported_band *sband)
 333 {
 334         u8 *pos;
 335         u32 cap;
 336         struct ieee80211_sta_vht_cap vht_cap;
 337
 338         BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
 339
 340         memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
 341
 342         /* determine capability flags */
 343         cap = vht_cap.cap;
 344
 345         /* reserve and fill IE */
 346         pos = skb_put(skb, sizeof(struct ieee80211_vht_capabilities) + 2);
 347         ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
 348 }
 349
 350 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
 351 {
 352         struct ieee80211_local *local = sdata->local;
 353         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 354         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
 355         struct sk_buff *skb;
 356         struct ieee80211_mgmt *mgmt;
 357         u8 *pos, qos_info;
 358         size_t offset = 0, noffset;
 359         int i, count, rates_len, supp_rates_len;
 360         u16 capab;
 361         struct ieee80211_supported_band *sband;
 362         u32 rates = 0;
 363
 364         lockdep_assert_held(&ifmgd->mtx);
 365
 366         sband = local->hw.wiphy->bands[local->oper_channel->band];
 367
 368         if (assoc_data->supp_rates_len) {
 369                 /*
 370                  * Get all rates supported by the device and the AP as
 371                  * some APs don't like getting a superset of their rates
 372                  * in the association request (e.g. D-Link DAP 1353 in
 373                  * b-only mode)...
 374                  */
 375                 rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
 376                                                        assoc_data->supp_rates_len,
 377                                                        sband, &rates);
 378         } else {
 379                 /*
 380                  * In case AP not provide any supported rates information
 381                  * before association, we send information element(s) with
 382                  * all rates that we support.
 383                  */
 384                 rates = ~0;
 385                 rates_len = sband->n_bitrates;
 386         }
 387
 388         skb = alloc_skb(local->hw.extra_tx_headroom +
 389                         sizeof(*mgmt) + /* bit too much but doesn't matter */
 390                         2 + assoc_data->ssid_len + /* SSID */
 391                         4 + rates_len + /* (extended) rates */
 392                         4 + /* power capability */
 393                         2 + 2 * sband->n_channels + /* supported channels */
 394                         2 + sizeof(struct ieee80211_ht_cap) + /* HT */
 395                         2 + sizeof(struct ieee80211_vht_capabilities) + /* VHT */
 396                         assoc_data->ie_len + /* extra IEs */
 397                         9, /* WMM */
 398                         GFP_KERNEL);
 399         if (!skb)
 400                 return;
 401
 402         skb_reserve(skb, local->hw.extra_tx_headroom);
 403
 404         capab = WLAN_CAPABILITY_ESS;
 405
 406         if (sband->band == IEEE80211_BAND_2GHZ) {
 407                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
 408                         capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
 409                 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
 410                         capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
 411         }
 412
 413         if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
 414                 capab |= WLAN_CAPABILITY_PRIVACY;
 415
 416         if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
 417             (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
 418                 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 419
 420         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 421         memset(mgmt, 0, 24);
 422         memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
 423         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 424         memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);
 425
 426         if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
 427                 skb_put(skb, 10);
 428                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 429                                                   IEEE80211_STYPE_REASSOC_REQ);
 430                 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
 431                 mgmt->u.reassoc_req.listen_interval =
 432                                 cpu_to_le16(local->hw.conf.listen_interval);
 433                 memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
 434                        ETH_ALEN);
 435         } else {
 436                 skb_put(skb, 4);
 437                 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 438                                                   IEEE80211_STYPE_ASSOC_REQ);
 439                 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
 440                 mgmt->u.assoc_req.listen_interval =
 441                                 cpu_to_le16(local->hw.conf.listen_interval);
 442         }
 443
 444         /* SSID */
 445         pos = skb_put(skb, 2 + assoc_data->ssid_len);
 446         *pos++ = WLAN_EID_SSID;
 447         *pos++ = assoc_data->ssid_len;
 448         memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);
 449
 450         /* add all rates which were marked to be used above */
 451         supp_rates_len = rates_len;
 452         if (supp_rates_len > 8)
 453                 supp_rates_len = 8;
 454
 455         pos = skb_put(skb, supp_rates_len + 2);
 456         *pos++ = WLAN_EID_SUPP_RATES;
 457         *pos++ = supp_rates_len;
 458
 459         count = 0;
 460         for (i = 0; i < sband->n_bitrates; i++) {
 461                 if (BIT(i) & rates) {
 462                         int rate = sband->bitrates[i].bitrate;
 463                         *pos++ = (u8) (rate / 5);
 464                         if (++count == 8)
 465                                 break;
 466                 }
 467         }
 468
 469         if (rates_len > count) {
 470                 pos = skb_put(skb, rates_len - count + 2);
 471                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 472                 *pos++ = rates_len - count;
 473
 474                 for (i++; i < sband->n_bitrates; i++) {
 475                         if (BIT(i) & rates) {
 476                                 int rate = sband->bitrates[i].bitrate;
 477                                 *pos++ = (u8) (rate / 5);
 478                         }
 479                 }
 480         }
 481
 482         if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
 483                 /* 1. power capabilities */
 484                 pos = skb_put(skb, 4);
 485                 *pos++ = WLAN_EID_PWR_CAPABILITY;
 486                 *pos++ = 2;
 487                 *pos++ = 0; /* min tx power */
 488                 *pos++ = local->oper_channel->max_power; /* max tx power */
 489
 490                 /* 2. supported channels */
 491                 /* TODO: get this in reg domain format */
 492                 pos = skb_put(skb, 2 * sband->n_channels + 2);
 493                 *pos++ = WLAN_EID_SUPPORTED_CHANNELS;
 494                 *pos++ = 2 * sband->n_channels;
 495                 for (i = 0; i < sband->n_channels; i++) {
 496                         *pos++ = ieee80211_frequency_to_channel(
 497                                         sband->channels[i].center_freq);
 498                         *pos++ = 1; /* one channel in the subband*/
 499                 }
 500         }
 501
 502         /* if present, add any custom IEs that go before HT */
 503         if (assoc_data->ie_len && assoc_data->ie) {
 504                 static const u8 before_ht[] = {
 505                         WLAN_EID_SSID,
 506                         WLAN_EID_SUPP_RATES,
 507                         WLAN_EID_EXT_SUPP_RATES,
 508                         WLAN_EID_PWR_CAPABILITY,
 509                         WLAN_EID_SUPPORTED_CHANNELS,
 510                         WLAN_EID_RSN,
 511                         WLAN_EID_QOS_CAPA,
 512                         WLAN_EID_RRM_ENABLED_CAPABILITIES,
 513                         WLAN_EID_MOBILITY_DOMAIN,
 514                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
 515                 };
 516                 noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
 517                                              before_ht, ARRAY_SIZE(before_ht),
 518                                              offset);
 519                 pos = skb_put(skb, noffset - offset);
 520                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 521                 offset = noffset;
 522         }
 523
 524         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
 525                 ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
 526                                     sband, local->oper_channel, ifmgd->ap_smps);
 527
 528         if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
 529                 ieee80211_add_vht_ie(sdata, skb, sband);
 530
 531         /* if present, add any custom non-vendor IEs that go after HT */
 532         if (assoc_data->ie_len && assoc_data->ie) {
 533                 noffset = ieee80211_ie_split_vendor(assoc_data->ie,
 534                                                     assoc_data->ie_len,
 535                                                     offset);
 536                 pos = skb_put(skb, noffset - offset);
 537                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 538                 offset = noffset;
 539         }
 540
 541         if (assoc_data->wmm) {
 542                 if (assoc_data->uapsd) {
 543                         qos_info = ifmgd->uapsd_queues;
 544                         qos_info |= (ifmgd->uapsd_max_sp_len <<
 545                                      IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
 546                 } else {
 547                         qos_info = 0;
 548                 }
 549
 550                 pos = skb_put(skb, 9);
 551                 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 552                 *pos++ = 7; /* len */
 553                 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
 554                 *pos++ = 0x50;
 555                 *pos++ = 0xf2;
 556                 *pos++ = 2; /* WME */
 557                 *pos++ = 0; /* WME info */
 558                 *pos++ = 1; /* WME ver */
 559                 *pos++ = qos_info;
 560         }
 561
 562         /* add any remaining custom (i.e. vendor specific here) IEs */
 563         if (assoc_data->ie_len && assoc_data->ie) {
 564                 noffset = assoc_data->ie_len;
 565                 pos = skb_put(skb, noffset - offset);
 566                 memcpy(pos, assoc_data->ie + offset, noffset - offset);
 567         }
 568
 569         drv_mgd_prepare_tx(local, sdata);
 570
 571         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 572         ieee80211_tx_skb(sdata, skb);
 573 }
 574
 575 void ieee80211_send_pspoll(struct ieee80211_local *local,
 576                            struct ieee80211_sub_if_data *sdata)
 577 {
 578         struct ieee80211_pspoll *pspoll;
 579         struct sk_buff *skb;
 580
 581         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 582         if (!skb)
 583                 return;
 584
 585         pspoll = (struct ieee80211_pspoll *) skb->data;
 586         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 587
 588         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 589         ieee80211_tx_skb(sdata, skb);
 590 }
 591
 592 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 593                              struct ieee80211_sub_if_data *sdata,
 594                              int powersave)
 595 {
 596         struct sk_buff *skb;
 597         struct ieee80211_hdr_3addr *nullfunc;
 598         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 599
 600         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 601         if (!skb)
 602                 return;
 603
 604         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 605         if (powersave)
 606                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 607
 608         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 609         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 610                             IEEE80211_STA_CONNECTION_POLL))
 611                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 612
 613         ieee80211_tx_skb(sdata, skb);
 614 }
 615
 616 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 617                                           struct ieee80211_sub_if_data *sdata)
 618 {
 619         struct sk_buff *skb;
 620         struct ieee80211_hdr *nullfunc;
 621         __le16 fc;
 622
 623         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 624                 return;
 625
 626         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 627         if (!skb)
 628                 return;
 629
 630         skb_reserve(skb, local->hw.extra_tx_headroom);
 631
 632         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 633         memset(nullfunc, 0, 30);
 634         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 635                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 636         nullfunc->frame_control = fc;
 637         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 638         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 639         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 640         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 641
 642         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 643         ieee80211_tx_skb(sdata, skb);
 644 }
 645
 646 /* spectrum management related things */
 647 static void ieee80211_chswitch_work(struct work_struct *work)
 648 {
 649         struct ieee80211_sub_if_data *sdata =
 650                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 651         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 652
 653         if (!ieee80211_sdata_running(sdata))
 654                 return;
 655
 656         mutex_lock(&ifmgd->mtx);
 657         if (!ifmgd->associated)
 658                 goto out;
 659
 660         sdata->local->oper_channel = sdata->local->csa_channel;
 661         if (!sdata->local->ops->channel_switch) {
 662                 /* call "hw_config" only if doing sw channel switch */
 663                 ieee80211_hw_config(sdata->local,
 664                         IEEE80211_CONF_CHANGE_CHANNEL);
 665         } else {
 666                 /* update the device channel directly */
 667                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
 668         }
 669
 670         /* XXX: shouldn't really modify cfg80211-owned data! */
 671         ifmgd->associated->channel = sdata->local->oper_channel;
 672
 673         /* XXX: wait for a beacon first? */
 674         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 675                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 676  out:
 677         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 678         mutex_unlock(&ifmgd->mtx);
 679 }
 680
 681 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
 682 {
 683         struct ieee80211_sub_if_data *sdata;
 684         struct ieee80211_if_managed *ifmgd;
 685
 686         sdata = vif_to_sdata(vif);
 687         ifmgd = &sdata->u.mgd;
 688
 689         trace_api_chswitch_done(sdata, success);
 690         if (!success) {
 691                 sdata_info(sdata,
 692                            "driver channel switch failed, disconnecting\n");
 693                 ieee80211_queue_work(&sdata->local->hw,
 694                                      &ifmgd->csa_connection_drop_work);
 695         } else {
 696                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 697         }
 698 }
 699 EXPORT_SYMBOL(ieee80211_chswitch_done);
 700
 701 static void ieee80211_chswitch_timer(unsigned long data)
 702 {
 703         struct ieee80211_sub_if_data *sdata =
 704                 (struct ieee80211_sub_if_data *) data;
 705         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 706
 707         if (sdata->local->quiescing) {
 708                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 709                 return;
 710         }
 711
 712         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 713 }
 714
 715 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 716                                       struct ieee80211_channel_sw_ie *sw_elem,
 717                                       struct ieee80211_bss *bss,
 718                                       u64 timestamp)
 719 {
 720         struct cfg80211_bss *cbss =
 721                 container_of((void *)bss, struct cfg80211_bss, priv);
 722         struct ieee80211_channel *new_ch;
 723         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 724         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
 725                                                       cbss->channel->band);
 726
 727         ASSERT_MGD_MTX(ifmgd);
 728
 729         if (!ifmgd->associated)
 730                 return;
 731
 732         if (sdata->local->scanning)
 733                 return;
 734
 735         /* Disregard subsequent beacons if we are already running a timer
 736            processing a CSA */
 737
 738         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 739                 return;
 740
 741         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 742         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED) {
 743                 sdata_info(sdata,
 744                            "AP %pM switches to unsupported channel (%d MHz), disconnecting\n",
 745                            ifmgd->associated->bssid, new_freq);
 746                 ieee80211_queue_work(&sdata->local->hw,
 747                                      &ifmgd->csa_connection_drop_work);
 748                 return;
 749         }
 750
 751         sdata->local->csa_channel = new_ch;
 752
 753         ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 754
 755         if (sw_elem->mode)
 756                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 757                                 IEEE80211_QUEUE_STOP_REASON_CSA);
 758
 759         if (sdata->local->ops->channel_switch) {
 760                 /* use driver's channel switch callback */
 761                 struct ieee80211_channel_switch ch_switch = {
 762                         .timestamp = timestamp,
 763                         .block_tx = sw_elem->mode,
 764                         .channel = new_ch,
 765                         .count = sw_elem->count,
 766                 };
 767
 768                 drv_channel_switch(sdata->local, &ch_switch);
 769                 return;
 770         }
 771
 772         /* channel switch handled in software */
 773         if (sw_elem->count <= 1)
 774                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 775         else
 776                 mod_timer(&ifmgd->chswitch_timer,
 777                           TU_TO_EXP_TIME(sw_elem->count *
 778                                          cbss->beacon_interval));
 779 }
 780
 781 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 782                                         struct ieee80211_channel *channel,
 783                                         const u8 *country_ie, u8 country_ie_len,
 784                                         const u8 *pwr_constr_elem)
 785 {
 786         struct ieee80211_country_ie_triplet *triplet;
 787         int chan = ieee80211_frequency_to_channel(channel->center_freq);
 788         int i, chan_pwr, chan_increment, new_ap_level;
 789         bool have_chan_pwr = false;
 790
 791         /* Invalid IE */
 792         if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
 793                 return;
 794
 795         triplet = (void *)(country_ie + 3);
 796         country_ie_len -= 3;
 797
 798         switch (channel->band) {
 799         default:
 800                 WARN_ON_ONCE(1);
 801                 /* fall through */
 802         case IEEE80211_BAND_2GHZ:
 803         case IEEE80211_BAND_60GHZ:
 804                 chan_increment = 1;
 805                 break;
 806         case IEEE80211_BAND_5GHZ:
 807                 chan_increment = 4;
 808                 break;
 809         }
 810
 811         /* find channel */
 812         while (country_ie_len >= 3) {
 813                 u8 first_channel = triplet->chans.first_channel;
 814
 815                 if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
 816                         goto next;
 817
 818                 for (i = 0; i < triplet->chans.num_channels; i++) {
 819                         if (first_channel + i * chan_increment == chan) {
 820                                 have_chan_pwr = true;
 821                                 chan_pwr = triplet->chans.max_power;
 822                                 break;
 823                         }
 824                 }
 825                 if (have_chan_pwr)
 826                         break;
 827
 828  next:
 829                 triplet++;
 830                 country_ie_len -= 3;
 831         }
 832
 833         if (!have_chan_pwr)
 834                 return;
 835
 836         new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
 837
 838         if (sdata->local->ap_power_level == new_ap_level)
 839                 return;
 840
 841         sdata_info(sdata,
 842                    "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
 843                    new_ap_level, chan_pwr, *pwr_constr_elem,
 844                    sdata->u.mgd.bssid);
 845         sdata->local->ap_power_level = new_ap_level;
 846         ieee80211_hw_config(sdata->local, 0);
 847 }
 848
 849 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
 850 {
 851         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 852         struct ieee80211_local *local = sdata->local;
 853         struct ieee80211_conf *conf = &local->hw.conf;
 854
 855         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 856                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 857                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 858
 859         local->disable_dynamic_ps = false;
 860         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
 861 }
 862 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
 863
 864 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
 865 {
 866         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 867         struct ieee80211_local *local = sdata->local;
 868         struct ieee80211_conf *conf = &local->hw.conf;
 869
 870         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
 871                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
 872                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
 873
 874         local->disable_dynamic_ps = true;
 875         conf->dynamic_ps_timeout = 0;
 876         del_timer_sync(&local->dynamic_ps_timer);
 877         ieee80211_queue_work(&local->hw,
 878                              &local->dynamic_ps_enable_work);
 879 }
 880 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
 881
 882 /* powersave */
 883 static void ieee80211_enable_ps(struct ieee80211_local *local,
 884                                 struct ieee80211_sub_if_data *sdata)
 885 {
 886         struct ieee80211_conf *conf = &local->hw.conf;
 887
 888         /*
 889          * If we are scanning right now then the parameters will
 890          * take effect when scan finishes.
 891          */
 892         if (local->scanning)
 893                 return;
 894
 895         if (conf->dynamic_ps_timeout > 0 &&
 896             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 897                 mod_timer(&local->dynamic_ps_timer, jiffies +
 898                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 899         } else {
 900                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 901                         ieee80211_send_nullfunc(local, sdata, 1);
 902
 903                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 904                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 905                         return;
 906
 907                 conf->flags |= IEEE80211_CONF_PS;
 908                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 909         }
 910 }
 911
 912 static void ieee80211_change_ps(struct ieee80211_local *local)
 913 {
 914         struct ieee80211_conf *conf = &local->hw.conf;
 915
 916         if (local->ps_sdata) {
 917                 ieee80211_enable_ps(local, local->ps_sdata);
 918         } else if (conf->flags & IEEE80211_CONF_PS) {
 919                 conf->flags &= ~IEEE80211_CONF_PS;
 920                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 921                 del_timer_sync(&local->dynamic_ps_timer);
 922                 cancel_work_sync(&local->dynamic_ps_enable_work);
 923         }
 924 }
 925
 926 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
 927 {
 928         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
 929         struct sta_info *sta = NULL;
 930         bool authorized = false;
 931
 932         if (!mgd->powersave)
 933                 return false;
 934
 935         if (mgd->broken_ap)
 936                 return false;
 937
 938         if (!mgd->associated)
 939                 return false;
 940
 941         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
 942                           IEEE80211_STA_CONNECTION_POLL))
 943                 return false;
 944
 945         rcu_read_lock();
 946         sta = sta_info_get(sdata, mgd->bssid);
 947         if (sta)
 948                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
 949         rcu_read_unlock();
 950
 951         return authorized;
 952 }
 953
 954 /* need to hold RTNL or interface lock */
 955 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 956 {
 957         struct ieee80211_sub_if_data *sdata, *found = NULL;
 958         int count = 0;
 959         int timeout;
 960
 961         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 962                 local->ps_sdata = NULL;
 963                 return;
 964         }
 965
 966         list_for_each_entry(sdata, &local->interfaces, list) {
 967                 if (!ieee80211_sdata_running(sdata))
 968                         continue;
 969                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 970                         /* If an AP vif is found, then disable PS
 971                          * by setting the count to zero thereby setting
 972                          * ps_sdata to NULL.
 973                          */
 974                         count = 0;
 975                         break;
 976                 }
 977                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 978                         continue;
 979                 found = sdata;
 980                 count++;
 981         }
 982
 983         if (count == 1 && ieee80211_powersave_allowed(found)) {
 984                 struct ieee80211_conf *conf = &local->hw.conf;
 985                 s32 beaconint_us;
 986
 987                 if (latency < 0)
 988                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
 989
 990                 beaconint_us = ieee80211_tu_to_usec(
 991                                         found->vif.bss_conf.beacon_int);
 992
 993                 timeout = local->dynamic_ps_forced_timeout;
 994                 if (timeout < 0) {
 995                         /*
 996                          * Go to full PSM if the user configures a very low
 997                          * latency requirement.
 998                          * The 2000 second value is there for compatibility
 999                          * until the PM_QOS_NETWORK_LATENCY is configured
1000                          * with real values.
1001                          */
1002                         if (latency > (1900 * USEC_PER_MSEC) &&
1003                             latency != (2000 * USEC_PER_SEC))
1004                                 timeout = 0;
1005                         else
1006                                 timeout = 100;
1007                 }
1008                 local->dynamic_ps_user_timeout = timeout;
1009                 if (!local->disable_dynamic_ps)
1010                         conf->dynamic_ps_timeout =
1011                                 local->dynamic_ps_user_timeout;
1012
1013                 if (beaconint_us > latency) {
1014                         local->ps_sdata = NULL;
1015                 } else {
1016                         struct ieee80211_bss *bss;
1017                         int maxslp = 1;
1018                         u8 dtimper;
1019
1020                         bss = (void *)found->u.mgd.associated->priv;
1021                         dtimper = bss->dtim_period;
1022
1023                         /* If the TIM IE is invalid, pretend the value is 1 */
1024                         if (!dtimper)
1025                                 dtimper = 1;
1026                         else if (dtimper > 1)
1027                                 maxslp = min_t(int, dtimper,
1028                                                     latency / beaconint_us);
1029
1030                         local->hw.conf.max_sleep_period = maxslp;
1031                         local->hw.conf.ps_dtim_period = dtimper;
1032                         local->ps_sdata = found;
1033                 }
1034         } else {
1035                 local->ps_sdata = NULL;
1036         }
1037
1038         ieee80211_change_ps(local);
1039 }
1040
1041 void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
1042 {
1043         bool ps_allowed = ieee80211_powersave_allowed(sdata);
1044
1045         if (sdata->vif.bss_conf.ps != ps_allowed) {
1046                 sdata->vif.bss_conf.ps = ps_allowed;
1047                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
1048         }
1049 }
1050
1051 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
1052 {
1053         struct ieee80211_local *local =
1054                 container_of(work, struct ieee80211_local,
1055                              dynamic_ps_disable_work);
1056
1057         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1058                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1059                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1060         }
1061
1062         ieee80211_wake_queues_by_reason(&local->hw,
1063                                         IEEE80211_QUEUE_STOP_REASON_PS);
1064 }
1065
1066 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
1067 {
1068         struct ieee80211_local *local =
1069                 container_of(work, struct ieee80211_local,
1070                              dynamic_ps_enable_work);
1071         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
1072         struct ieee80211_if_managed *ifmgd;
1073         unsigned long flags;
1074         int q;
1075
1076         /* can only happen when PS was just disabled anyway */
1077         if (!sdata)
1078                 return;
1079
1080         ifmgd = &sdata->u.mgd;
1081
1082         if (local->hw.conf.flags & IEEE80211_CONF_PS)
1083                 return;
1084
1085         if (!local->disable_dynamic_ps &&
1086             local->hw.conf.dynamic_ps_timeout > 0) {
1087                 /* don't enter PS if TX frames are pending */
1088                 if (drv_tx_frames_pending(local)) {
1089                         mod_timer(&local->dynamic_ps_timer, jiffies +
1090                                   msecs_to_jiffies(
1091                                   local->hw.conf.dynamic_ps_timeout));
1092                         return;
1093                 }
1094
1095                 /*
1096                  * transmission can be stopped by others which leads to
1097                  * dynamic_ps_timer expiry. Postpone the ps timer if it
1098                  * is not the actual idle state.
1099                  */
1100                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1101                 for (q = 0; q < local->hw.queues; q++) {
1102                         if (local->queue_stop_reasons[q]) {
1103                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1104                                                        flags);
1105                                 mod_timer(&local->dynamic_ps_timer, jiffies +
1106                                           msecs_to_jiffies(
1107                                           local->hw.conf.dynamic_ps_timeout));
1108                                 return;
1109                         }
1110                 }
1111                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1112         }
1113
1114         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1115             !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1116                 netif_tx_stop_all_queues(sdata->dev);
1117
1118                 if (drv_tx_frames_pending(local))
1119                         mod_timer(&local->dynamic_ps_timer, jiffies +
1120                                   msecs_to_jiffies(
1121                                   local->hw.conf.dynamic_ps_timeout));
1122                 else {
1123                         ieee80211_send_nullfunc(local, sdata, 1);
1124                         /* Flush to get the tx status of nullfunc frame */
1125                         drv_flush(local, false);
1126                 }
1127         }
1128
1129         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
1130               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1131             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1132                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1133                 local->hw.conf.flags |= IEEE80211_CONF_PS;
1134                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1135         }
1136
1137         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1138                 netif_tx_wake_all_queues(sdata->dev);
1139 }
1140
1141 void ieee80211_dynamic_ps_timer(unsigned long data)
1142 {
1143         struct ieee80211_local *local = (void *) data;
1144
1145         if (local->quiescing || local->suspended)
1146                 return;
1147
1148         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1149 }
1150
1151 /* MLME */
1152 static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1153                                      struct ieee80211_sub_if_data *sdata,
1154                                      u8 *wmm_param, size_t wmm_param_len)
1155 {
1156         struct ieee80211_tx_queue_params params;
1157         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1158         size_t left;
1159         int count;
1160         u8 *pos, uapsd_queues = 0;
1161
1162         if (!local->ops->conf_tx)
1163                 return false;
1164
1165         if (local->hw.queues < IEEE80211_NUM_ACS)
1166                 return false;
1167
1168         if (!wmm_param)
1169                 return false;
1170
1171         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1172                 return false;
1173
1174         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1175                 uapsd_queues = ifmgd->uapsd_queues;
1176
1177         count = wmm_param[6] & 0x0f;
1178         if (count == ifmgd->wmm_last_param_set)
1179                 return false;
1180         ifmgd->wmm_last_param_set = count;
1181
1182         pos = wmm_param + 8;
1183         left = wmm_param_len - 8;
1184
1185         memset(&params, 0, sizeof(params));
1186
1187         sdata->wmm_acm = 0;
1188         for (; left >= 4; left -= 4, pos += 4) {
1189                 int aci = (pos[0] >> 5) & 0x03;
1190                 int acm = (pos[0] >> 4) & 0x01;
1191                 bool uapsd = false;
1192                 int queue;
1193
1194                 switch (aci) {
1195                 case 1: /* AC_BK */
1196                         queue = 3;
1197                         if (acm)
1198                                 sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1199                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
1200                                 uapsd = true;
1201                         break;
1202                 case 2: /* AC_VI */
1203                         queue = 1;
1204                         if (acm)
1205                                 sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1206                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
1207                                 uapsd = true;
1208                         break;
1209                 case 3: /* AC_VO */
1210                         queue = 0;
1211                         if (acm)
1212                                 sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1213                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
1214                                 uapsd = true;
1215                         break;
1216                 case 0: /* AC_BE */
1217                 default:
1218                         queue = 2;
1219                         if (acm)
1220                                 sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1221                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
1222                                 uapsd = true;
1223                         break;
1224                 }
1225
1226                 params.aifs = pos[0] & 0x0f;
1227                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
1228                 params.cw_min = ecw2cw(pos[1] & 0x0f);
1229                 params.txop = get_unaligned_le16(pos + 2);
1230                 params.uapsd = uapsd;
1231
1232                 mlme_dbg(sdata,
1233                          "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
1234                          queue, aci, acm,
1235                          params.aifs, params.cw_min, params.cw_max,
1236                          params.txop, params.uapsd);
1237                 sdata->tx_conf[queue] = params;
1238                 if (drv_conf_tx(local, sdata, queue, &params))
1239                         sdata_err(sdata,
1240                                   "failed to set TX queue parameters for queue %d\n",
1241                                   queue);
1242         }
1243
1244         /* enable WMM or activate new settings */
1245         sdata->vif.bss_conf.qos = true;
1246         return true;
1247 }
1248
1249 static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1250 {
1251         lockdep_assert_held(&sdata->local->mtx);
1252
1253         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1254                                 IEEE80211_STA_BEACON_POLL);
1255         ieee80211_run_deferred_scan(sdata->local);
1256 }
1257
1258 static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
1259 {
1260         mutex_lock(&sdata->local->mtx);
1261         __ieee80211_stop_poll(sdata);
1262         mutex_unlock(&sdata->local->mtx);
1263 }
1264
1265 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
1266                                            u16 capab, bool erp_valid, u8 erp)
1267 {
1268         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1269         u32 changed = 0;
1270         bool use_protection;
1271         bool use_short_preamble;
1272         bool use_short_slot;
1273
1274         if (erp_valid) {
1275                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
1276                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
1277         } else {
1278                 use_protection = false;
1279                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
1280         }
1281
1282         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
1283         if (sdata->local->oper_channel->band == IEEE80211_BAND_5GHZ)
1284                 use_short_slot = true;
1285
1286         if (use_protection != bss_conf->use_cts_prot) {
1287                 bss_conf->use_cts_prot = use_protection;
1288                 changed |= BSS_CHANGED_ERP_CTS_PROT;
1289         }
1290
1291         if (use_short_preamble != bss_conf->use_short_preamble) {
1292                 bss_conf->use_short_preamble = use_short_preamble;
1293                 changed |= BSS_CHANGED_ERP_PREAMBLE;
1294         }
1295
1296         if (use_short_slot != bss_conf->use_short_slot) {
1297                 bss_conf->use_short_slot = use_short_slot;
1298                 changed |= BSS_CHANGED_ERP_SLOT;
1299         }
1300
1301         return changed;
1302 }
1303
1304 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1305                                      struct cfg80211_bss *cbss,
1306                                      u32 bss_info_changed)
1307 {
1308         struct ieee80211_bss *bss = (void *)cbss->priv;
1309         struct ieee80211_local *local = sdata->local;
1310         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1311
1312         bss_info_changed |= BSS_CHANGED_ASSOC;
1313         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1314                 bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1315
1316         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1317                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1318
1319         sdata->u.mgd.associated = cbss;
1320         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1321
1322         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1323
1324         /* just to be sure */
1325         ieee80211_stop_poll(sdata);
1326
1327         ieee80211_led_assoc(local, 1);
1328
1329         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1330                 bss_conf->dtim_period = bss->dtim_period;
1331         else
1332                 bss_conf->dtim_period = 0;
1333
1334         bss_conf->assoc = 1;
1335
1336         /* Tell the driver to monitor connection quality (if supported) */
1337         if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1338             bss_conf->cqm_rssi_thold)
1339                 bss_info_changed |= BSS_CHANGED_CQM;
1340
1341         /* Enable ARP filtering */
1342         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1343                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1344                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1345         }
1346
1347         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1348
1349         mutex_lock(&local->iflist_mtx);
1350         ieee80211_recalc_ps(local, -1);
1351         mutex_unlock(&local->iflist_mtx);
1352
1353         ieee80211_recalc_smps(local);
1354         ieee80211_recalc_ps_vif(sdata);
1355
1356         netif_tx_start_all_queues(sdata->dev);
1357         netif_carrier_on(sdata->dev);
1358 }
1359
1360 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1361                                    u16 stype, u16 reason, bool tx,
1362                                    u8 *frame_buf)
1363 {
1364         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1365         struct ieee80211_local *local = sdata->local;
1366         struct sta_info *sta;
1367         u32 changed = 0;
1368
1369         ASSERT_MGD_MTX(ifmgd);
1370
1371         if (WARN_ON_ONCE(tx && !frame_buf))
1372                 return;
1373
1374         if (WARN_ON(!ifmgd->associated))
1375                 return;
1376
1377         ieee80211_stop_poll(sdata);
1378
1379         ifmgd->associated = NULL;
1380
1381         /*
1382          * we need to commit the associated = NULL change because the
1383          * scan code uses that to determine whether this iface should
1384          * go to/wake up from powersave or not -- and could otherwise
1385          * wake the queues erroneously.
1386          */
1387         smp_mb();
1388
1389         /*
1390          * Thus, we can only afterwards stop the queues -- to account
1391          * for the case where another CPU is finishing a scan at this
1392          * time -- we don't want the scan code to enable queues.
1393          */
1394
1395         netif_tx_stop_all_queues(sdata->dev);
1396         netif_carrier_off(sdata->dev);
1397
1398         mutex_lock(&local->sta_mtx);
1399         sta = sta_info_get(sdata, ifmgd->bssid);
1400         if (sta) {
1401                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1402                 ieee80211_sta_tear_down_BA_sessions(sta, false);
1403         }
1404         mutex_unlock(&local->sta_mtx);
1405
1406         /*
1407          * if we want to get out of ps before disassoc (why?) we have
1408          * to do it before sending disassoc, as otherwise the null-packet
1409          * won't be valid.
1410          */
1411         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1412                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1413                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1414         }
1415         local->ps_sdata = NULL;
1416
1417         /* disable per-vif ps */
1418         ieee80211_recalc_ps_vif(sdata);
1419
1420         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
1421         if (tx)
1422                 drv_flush(local, false);
1423
1424         /* deauthenticate/disassociate now */
1425         if (tx || frame_buf)
1426                 ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
1427                                                reason, tx, frame_buf);
1428
1429         /* flush out frame */
1430         if (tx)
1431                 drv_flush(local, false);
1432
1433         /* clear bssid only after building the needed mgmt frames */
1434         memset(ifmgd->bssid, 0, ETH_ALEN);
1435
1436         /* remove AP and TDLS peers */
1437         sta_info_flush(local, sdata);
1438
1439         /* finally reset all BSS / config parameters */
1440         changed |= ieee80211_reset_erp_info(sdata);
1441
1442         ieee80211_led_assoc(local, 0);
1443         changed |= BSS_CHANGED_ASSOC;
1444         sdata->vif.bss_conf.assoc = false;
1445
1446         /* on the next assoc, re-program HT parameters */
1447         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1448         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1449
1450         local->ap_power_level = 0;
1451
1452         del_timer_sync(&local->dynamic_ps_timer);
1453         cancel_work_sync(&local->dynamic_ps_enable_work);
1454
1455         /* Disable ARP filtering */
1456         if (sdata->vif.bss_conf.arp_filter_enabled) {
1457                 sdata->vif.bss_conf.arp_filter_enabled = false;
1458                 changed |= BSS_CHANGED_ARP_FILTER;
1459         }
1460
1461         sdata->vif.bss_conf.qos = false;
1462         changed |= BSS_CHANGED_QOS;
1463
1464         /* The BSSID (not really interesting) and HT changed */
1465         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1466         ieee80211_bss_info_change_notify(sdata, changed);
1467
1468         /* channel(_type) changes are handled by ieee80211_hw_config */
1469         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1470         ieee80211_hw_config(local, 0);
1471
1472         /* disassociated - set to defaults now */
1473         ieee80211_set_wmm_default(sdata, false);
1474
1475         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1476         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1477         del_timer_sync(&sdata->u.mgd.timer);
1478         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1479
1480         sdata->u.mgd.timers_running = 0;
1481 }
1482
1483 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1484                              struct ieee80211_hdr *hdr)
1485 {
1486         /*
1487          * We can postpone the mgd.timer whenever receiving unicast frames
1488          * from AP because we know that the connection is working both ways
1489          * at that time. But multicast frames (and hence also beacons) must
1490          * be ignored here, because we need to trigger the timer during
1491          * data idle periods for sending the periodic probe request to the
1492          * AP we're connected to.
1493          */
1494         if (is_multicast_ether_addr(hdr->addr1))
1495                 return;
1496
1497         ieee80211_sta_reset_conn_monitor(sdata);
1498 }
1499
1500 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1501 {
1502         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1503         struct ieee80211_local *local = sdata->local;
1504
1505         mutex_lock(&local->mtx);
1506         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1507                               IEEE80211_STA_CONNECTION_POLL))) {
1508                 mutex_unlock(&local->mtx);
1509                 return;
1510         }
1511
1512         __ieee80211_stop_poll(sdata);
1513
1514         mutex_lock(&local->iflist_mtx);
1515         ieee80211_recalc_ps(local, -1);
1516         mutex_unlock(&local->iflist_mtx);
1517
1518         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1519                 goto out;
1520
1521         /*
1522          * We've received a probe response, but are not sure whether
1523          * we have or will be receiving any beacons or data, so let's
1524          * schedule the timers again, just in case.
1525          */
1526         ieee80211_sta_reset_beacon_monitor(sdata);
1527
1528         mod_timer(&ifmgd->conn_mon_timer,
1529                   round_jiffies_up(jiffies +
1530                                    IEEE80211_CONNECTION_IDLE_TIME));
1531 out:
1532         mutex_unlock(&local->mtx);
1533 }
1534
1535 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1536                              struct ieee80211_hdr *hdr, bool ack)
1537 {
1538         if (!ieee80211_is_data(hdr->frame_control))
1539             return;
1540
1541         if (ack)
1542                 ieee80211_sta_reset_conn_monitor(sdata);
1543
1544         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1545             sdata->u.mgd.probe_send_count > 0) {
1546                 if (ack)
1547                         sdata->u.mgd.probe_send_count = 0;
1548                 else
1549                         sdata->u.mgd.nullfunc_failed = true;
1550                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1551         }
1552 }
1553
1554 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1555 {
1556         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1557         const u8 *ssid;
1558         u8 *dst = ifmgd->associated->bssid;
1559         u8 unicast_limit = max(1, max_probe_tries - 3);
1560
1561         /*
1562          * Try sending broadcast probe requests for the last three
1563          * probe requests after the first ones failed since some
1564          * buggy APs only support broadcast probe requests.
1565          */
1566         if (ifmgd->probe_send_count >= unicast_limit)
1567                 dst = NULL;
1568
1569         /*
1570          * When the hardware reports an accurate Tx ACK status, it's
1571          * better to send a nullfunc frame instead of a probe request,
1572          * as it will kick us off the AP quickly if we aren't associated
1573          * anymore. The timeout will be reset if the frame is ACKed by
1574          * the AP.
1575          */
1576         ifmgd->probe_send_count++;
1577
1578         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1579                 ifmgd->nullfunc_failed = false;
1580                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1581         } else {
1582                 int ssid_len;
1583
1584                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1585                 if (WARN_ON_ONCE(ssid == NULL))
1586                         ssid_len = 0;
1587                 else
1588                         ssid_len = ssid[1];
1589
1590                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1591                                          0, (u32) -1, true, false,
1592                                          ifmgd->associated->channel);
1593         }
1594
1595         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1596         run_again(ifmgd, ifmgd->probe_timeout);
1597         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1598                 drv_flush(sdata->local, false);
1599 }
1600
1601 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1602                                    bool beacon)
1603 {
1604         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1605         bool already = false;
1606
1607         if (!ieee80211_sdata_running(sdata))
1608                 return;
1609
1610         mutex_lock(&ifmgd->mtx);
1611
1612         if (!ifmgd->associated)
1613                 goto out;
1614
1615         mutex_lock(&sdata->local->mtx);
1616
1617         if (sdata->local->tmp_channel || sdata->local->scanning) {
1618                 mutex_unlock(&sdata->local->mtx);
1619                 goto out;
1620         }
1621
1622         if (beacon)
1623                 mlme_dbg_ratelimited(sdata,
1624                                      "detected beacon loss from AP - sending probe request\n");
1625
1626         ieee80211_cqm_rssi_notify(&sdata->vif,
1627                 NL80211_CQM_RSSI_BEACON_LOSS_EVENT, GFP_KERNEL);
1628
1629         /*
1630          * The driver/our work has already reported this event or the
1631          * connection monitoring has kicked in and we have already sent
1632          * a probe request. Or maybe the AP died and the driver keeps
1633          * reporting until we disassociate...
1634          *
1635          * In either case we have to ignore the current call to this
1636          * function (except for setting the correct probe reason bit)
1637          * because otherwise we would reset the timer every time and
1638          * never check whether we received a probe response!
1639          */
1640         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1641                             IEEE80211_STA_CONNECTION_POLL))
1642                 already = true;
1643
1644         if (beacon)
1645                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1646         else
1647                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1648
1649         mutex_unlock(&sdata->local->mtx);
1650
1651         if (already)
1652                 goto out;
1653
1654         mutex_lock(&sdata->local->iflist_mtx);
1655         ieee80211_recalc_ps(sdata->local, -1);
1656         mutex_unlock(&sdata->local->iflist_mtx);
1657
1658         ifmgd->probe_send_count = 0;
1659         ieee80211_mgd_probe_ap_send(sdata);
1660  out:
1661         mutex_unlock(&ifmgd->mtx);
1662 }
1663
1664 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1665                                           struct ieee80211_vif *vif)
1666 {
1667         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1668         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1669         struct cfg80211_bss *cbss;
1670         struct sk_buff *skb;
1671         const u8 *ssid;
1672         int ssid_len;
1673
1674         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1675                 return NULL;
1676
1677         ASSERT_MGD_MTX(ifmgd);
1678
1679         if (ifmgd->associated)
1680                 cbss = ifmgd->associated;
1681         else if (ifmgd->auth_data)
1682                 cbss = ifmgd->auth_data->bss;
1683         else if (ifmgd->assoc_data)
1684                 cbss = ifmgd->assoc_data->bss;
1685         else
1686                 return NULL;
1687
1688         ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1689         if (WARN_ON_ONCE(ssid == NULL))
1690                 ssid_len = 0;
1691         else
1692                 ssid_len = ssid[1];
1693
1694         skb = ieee80211_build_probe_req(sdata, cbss->bssid,
1695                                         (u32) -1,
1696                                         sdata->local->oper_channel,
1697                                         ssid + 2, ssid_len,
1698                                         NULL, 0, true);
1699
1700         return skb;
1701 }
1702 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1703
1704 static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata,
1705                                    bool transmit_frame)
1706 {
1707         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1708         struct ieee80211_local *local = sdata->local;
1709         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
1710
1711         mutex_lock(&ifmgd->mtx);
1712         if (!ifmgd->associated) {
1713                 mutex_unlock(&ifmgd->mtx);
1714                 return;
1715         }
1716
1717         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
1718                                WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1719                                transmit_frame, frame_buf);
1720         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
1721         mutex_unlock(&ifmgd->mtx);
1722
1723         /*
1724          * must be outside lock due to cfg80211,
1725          * but that's not a problem.
1726          */
1727         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
1728
1729         mutex_lock(&local->mtx);
1730         ieee80211_recalc_idle(local);
1731         mutex_unlock(&local->mtx);
1732 }
1733
1734 static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1735 {
1736         struct ieee80211_sub_if_data *sdata =
1737                 container_of(work, struct ieee80211_sub_if_data,
1738                              u.mgd.beacon_connection_loss_work);
1739         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1740         struct sta_info *sta;
1741
1742         if (ifmgd->associated) {
1743                 rcu_read_lock();
1744                 sta = sta_info_get(sdata, ifmgd->bssid);
1745                 if (sta)
1746                         sta->beacon_loss_count++;
1747                 rcu_read_unlock();
1748         }
1749
1750         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR) {
1751                 sdata_info(sdata, "Connection to AP %pM lost\n",
1752                            ifmgd->bssid);
1753                 __ieee80211_disconnect(sdata, false);
1754         } else {
1755                 ieee80211_mgd_probe_ap(sdata, true);
1756         }
1757 }
1758
1759 static void ieee80211_csa_connection_drop_work(struct work_struct *work)
1760 {
1761         struct ieee80211_sub_if_data *sdata =
1762                 container_of(work, struct ieee80211_sub_if_data,
1763                              u.mgd.csa_connection_drop_work);
1764
1765         ieee80211_wake_queues_by_reason(&sdata->local->hw,
1766                                         IEEE80211_QUEUE_STOP_REASON_CSA);
1767         __ieee80211_disconnect(sdata, true);
1768 }
1769
1770 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1771 {
1772         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1773         struct ieee80211_hw *hw = &sdata->local->hw;
1774
1775         trace_api_beacon_loss(sdata);
1776
1777         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1778         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1779 }
1780 EXPORT_SYMBOL(ieee80211_beacon_loss);
1781
1782 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1783 {
1784         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1785         struct ieee80211_hw *hw = &sdata->local->hw;
1786
1787         trace_api_connection_loss(sdata);
1788
1789         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1790         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1791 }
1792 EXPORT_SYMBOL(ieee80211_connection_loss);
1793
1794
1795 static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
1796                                         bool assoc)
1797 {
1798         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1799
1800         lockdep_assert_held(&sdata->u.mgd.mtx);
1801
1802         if (!assoc) {
1803                 sta_info_destroy_addr(sdata, auth_data->bss->bssid);
1804
1805                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
1806                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
1807         }
1808
1809         cfg80211_put_bss(auth_data->bss);
1810         kfree(auth_data);
1811         sdata->u.mgd.auth_data = NULL;
1812 }
1813
1814 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1815                                      struct ieee80211_mgmt *mgmt, size_t len)
1816 {
1817         struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
1818         u8 *pos;
1819         struct ieee802_11_elems elems;
1820
1821         pos = mgmt->u.auth.variable;
1822         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1823         if (!elems.challenge)
1824                 return;
1825         auth_data->expected_transaction = 4;
1826         drv_mgd_prepare_tx(sdata->local, sdata);
1827         ieee80211_send_auth(sdata, 3, auth_data->algorithm,
1828                             elems.challenge - 2, elems.challenge_len + 2,
1829                             auth_data->bss->bssid, auth_data->bss->bssid,
1830                             auth_data->key, auth_data->key_len,
1831                             auth_data->key_idx);
1832 }
1833
1834 static enum rx_mgmt_action __must_check
1835 ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1836                        struct ieee80211_mgmt *mgmt, size_t len)
1837 {
1838         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1839         u8 bssid[ETH_ALEN];
1840         u16 auth_alg, auth_transaction, status_code;
1841         struct sta_info *sta;
1842
1843         lockdep_assert_held(&ifmgd->mtx);
1844
1845         if (len < 24 + 6)
1846                 return RX_MGMT_NONE;
1847
1848         if (!ifmgd->auth_data || ifmgd->auth_data->done)
1849                 return RX_MGMT_NONE;
1850
1851         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
1852
1853         if (!ether_addr_equal(bssid, mgmt->bssid))
1854                 return RX_MGMT_NONE;
1855
1856         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
1857         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
1858         status_code = le16_to_cpu(mgmt->u.auth.status_code);
1859
1860         if (auth_alg != ifmgd->auth_data->algorithm ||
1861             auth_transaction != ifmgd->auth_data->expected_transaction)
1862                 return RX_MGMT_NONE;
1863
1864         if (status_code != WLAN_STATUS_SUCCESS) {
1865                 sdata_info(sdata, "%pM denied authentication (status %d)\n",
1866                            mgmt->sa, status_code);
1867                 ieee80211_destroy_auth_data(sdata, false);
1868                 return RX_MGMT_CFG80211_RX_AUTH;
1869         }
1870
1871         switch (ifmgd->auth_data->algorithm) {
1872         case WLAN_AUTH_OPEN:
1873         case WLAN_AUTH_LEAP:
1874         case WLAN_AUTH_FT:
1875                 break;
1876         case WLAN_AUTH_SHARED_KEY:
1877                 if (ifmgd->auth_data->expected_transaction != 4) {
1878                         ieee80211_auth_challenge(sdata, mgmt, len);
1879                         /* need another frame */
1880                         return RX_MGMT_NONE;
1881                 }
1882                 break;
1883         default:
1884                 WARN_ONCE(1, "invalid auth alg %d",
1885                           ifmgd->auth_data->algorithm);
1886                 return RX_MGMT_NONE;
1887         }
1888
1889         sdata_info(sdata, "authenticated\n");
1890         ifmgd->auth_data->done = true;
1891         ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
1892         run_again(ifmgd, ifmgd->auth_data->timeout);
1893
1894         /* move station state to auth */
1895         mutex_lock(&sdata->local->sta_mtx);
1896         sta = sta_info_get(sdata, bssid);
1897         if (!sta) {
1898                 WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
1899                 goto out_err;
1900         }
1901         if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
1902                 sdata_info(sdata, "failed moving %pM to auth\n", bssid);
1903                 goto out_err;
1904         }
1905         mutex_unlock(&sdata->local->sta_mtx);
1906
1907         return RX_MGMT_CFG80211_RX_AUTH;
1908  out_err:
1909         mutex_unlock(&sdata->local->sta_mtx);
1910         /* ignore frame -- wait for timeout */
1911         return RX_MGMT_NONE;
1912 }
1913
1914
1915 static enum rx_mgmt_action __must_check
1916 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1917                          struct ieee80211_mgmt *mgmt, size_t len)
1918 {
1919         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1920         const u8 *bssid = NULL;
1921         u16 reason_code;
1922
1923         lockdep_assert_held(&ifmgd->mtx);
1924
1925         if (len < 24 + 2)
1926                 return RX_MGMT_NONE;
1927
1928         if (!ifmgd->associated ||
1929             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1930                 return RX_MGMT_NONE;
1931
1932         bssid = ifmgd->associated->bssid;
1933
1934         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1935
1936         sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
1937                    bssid, reason_code);
1938
1939         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1940
1941         mutex_lock(&sdata->local->mtx);
1942         ieee80211_recalc_idle(sdata->local);
1943         mutex_unlock(&sdata->local->mtx);
1944
1945         return RX_MGMT_CFG80211_DEAUTH;
1946 }
1947
1948
1949 static enum rx_mgmt_action __must_check
1950 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1951                            struct ieee80211_mgmt *mgmt, size_t len)
1952 {
1953         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1954         u16 reason_code;
1955
1956         lockdep_assert_held(&ifmgd->mtx);
1957
1958         if (len < 24 + 2)
1959                 return RX_MGMT_NONE;
1960
1961         if (!ifmgd->associated ||
1962             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
1963                 return RX_MGMT_NONE;
1964
1965         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1966
1967         sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
1968                    mgmt->sa, reason_code);
1969
1970         ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
1971
1972         mutex_lock(&sdata->local->mtx);
1973         ieee80211_recalc_idle(sdata->local);
1974         mutex_unlock(&sdata->local->mtx);
1975
1976         return RX_MGMT_CFG80211_DISASSOC;
1977 }
1978
1979 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1980                                 u8 *supp_rates, unsigned int supp_rates_len,
1981                                 u32 *rates, u32 *basic_rates,
1982                                 bool *have_higher_than_11mbit,
1983                                 int *min_rate, int *min_rate_index)
1984 {
1985         int i, j;
1986
1987         for (i = 0; i < supp_rates_len; i++) {
1988                 int rate = (supp_rates[i] & 0x7f) * 5;
1989                 bool is_basic = !!(supp_rates[i] & 0x80);
1990
1991                 if (rate > 110)
1992                         *have_higher_than_11mbit = true;
1993
1994                 /*
1995                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1996                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1997                  *
1998                  * Note: Even through the membership selector and the basic
1999                  *       rate flag share the same bit, they are not exactly
2000                  *       the same.
2001                  */
2002                 if (!!(supp_rates[i] & 0x80) &&
2003                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
2004                         continue;
2005
2006                 for (j = 0; j < sband->n_bitrates; j++) {
2007                         if (sband->bitrates[j].bitrate == rate) {
2008                                 *rates |= BIT(j);
2009                                 if (is_basic)
2010                                         *basic_rates |= BIT(j);
2011                                 if (rate < *min_rate) {
2012                                         *min_rate = rate;
2013                                         *min_rate_index = j;
2014                                 }
2015                                 break;
2016                         }
2017                 }
2018         }
2019 }
2020
2021 static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2022                                          bool assoc)
2023 {
2024         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2025
2026         lockdep_assert_held(&sdata->u.mgd.mtx);
2027
2028         if (!assoc) {
2029                 sta_info_destroy_addr(sdata, assoc_data->bss->bssid);
2030
2031                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
2032                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2033         }
2034
2035         kfree(assoc_data);
2036         sdata->u.mgd.assoc_data = NULL;
2037 }
2038
2039 static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
2040                                     struct cfg80211_bss *cbss,
2041                                     struct ieee80211_mgmt *mgmt, size_t len)
2042 {
2043         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2044         struct ieee80211_local *local = sdata->local;
2045         struct ieee80211_supported_band *sband;
2046         struct sta_info *sta;
2047         u8 *pos;
2048         u16 capab_info, aid;
2049         struct ieee802_11_elems elems;
2050         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2051         u32 changed = 0;
2052         int err;
2053
2054         /* AssocResp and ReassocResp have identical structure */
2055
2056         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2057         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2058
2059         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
2060                 sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
2061                            aid);
2062         aid &= ~(BIT(15) | BIT(14));
2063
2064         ifmgd->broken_ap = false;
2065
2066         if (aid == 0 || aid > IEEE80211_MAX_AID) {
2067                 sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
2068                            aid);
2069                 aid = 0;
2070                 ifmgd->broken_ap = true;
2071         }
2072
2073         pos = mgmt->u.assoc_resp.variable;
2074         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2075
2076         if (!elems.supp_rates) {
2077                 sdata_info(sdata, "no SuppRates element in AssocResp\n");
2078                 return false;
2079         }
2080
2081         ifmgd->aid = aid;
2082
2083         mutex_lock(&sdata->local->sta_mtx);
2084         /*
2085          * station info was already allocated and inserted before
2086          * the association and should be available to us
2087          */
2088         sta = sta_info_get(sdata, cbss->bssid);
2089         if (WARN_ON(!sta)) {
2090                 mutex_unlock(&sdata->local->sta_mtx);
2091                 return false;
2092         }
2093
2094         sband = local->hw.wiphy->bands[local->oper_channel->band];
2095
2096         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2097                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2098                                 elems.ht_cap_elem, &sta->sta.ht_cap);
2099
2100         sta->supports_40mhz =
2101                 sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
2102
2103         rate_control_rate_init(sta);
2104
2105         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
2106                 set_sta_flag(sta, WLAN_STA_MFP);
2107
2108         if (elems.wmm_param)
2109                 set_sta_flag(sta, WLAN_STA_WME);
2110
2111         err = sta_info_move_state(sta, IEEE80211_STA_AUTH);
2112         if (!err)
2113                 err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2114         if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
2115                 err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
2116         if (err) {
2117                 sdata_info(sdata,
2118                            "failed to move station %pM to desired state\n",
2119                            sta->sta.addr);
2120                 WARN_ON(__sta_info_destroy(sta));
2121                 mutex_unlock(&sdata->local->sta_mtx);
2122                 return false;
2123         }
2124
2125         mutex_unlock(&sdata->local->sta_mtx);
2126
2127         /*
2128          * Always handle WMM once after association regardless
2129          * of the first value the AP uses. Setting -1 here has
2130          * that effect because the AP values is an unsigned
2131          * 4-bit value.
2132          */
2133         ifmgd->wmm_last_param_set = -1;
2134
2135         if (elems.wmm_param)
2136                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2137                                          elems.wmm_param_len);
2138         else
2139                 ieee80211_set_wmm_default(sdata, false);
2140         changed |= BSS_CHANGED_QOS;
2141
2142         if (elems.ht_operation && elems.wmm_param &&
2143             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
2144                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2145                                                   cbss->bssid, false);
2146
2147         /* set AID and assoc capability,
2148          * ieee80211_set_associated() will tell the driver */
2149         bss_conf->aid = aid;
2150         bss_conf->assoc_capability = capab_info;
2151         ieee80211_set_associated(sdata, cbss, changed);
2152
2153         /*
2154          * If we're using 4-addr mode, let the AP know that we're
2155          * doing so, so that it can create the STA VLAN on its side
2156          */
2157         if (ifmgd->use_4addr)
2158                 ieee80211_send_4addr_nullfunc(local, sdata);
2159
2160         /*
2161          * Start timer to probe the connection to the AP now.
2162          * Also start the timer that will detect beacon loss.
2163          */
2164         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2165         ieee80211_sta_reset_beacon_monitor(sdata);
2166
2167         return true;
2168 }
2169
2170 static enum rx_mgmt_action __must_check
2171 ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
2172                              struct ieee80211_mgmt *mgmt, size_t len,
2173                              struct cfg80211_bss **bss)
2174 {
2175         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2176         struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
2177         u16 capab_info, status_code, aid;
2178         struct ieee802_11_elems elems;
2179         u8 *pos;
2180         bool reassoc;
2181
2182         lockdep_assert_held(&ifmgd->mtx);
2183
2184         if (!assoc_data)
2185                 return RX_MGMT_NONE;
2186         if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2187                 return RX_MGMT_NONE;
2188
2189         /*
2190          * AssocResp and ReassocResp have identical structure, so process both
2191          * of them in this function.
2192          */
2193
2194         if (len < 24 + 6)
2195                 return RX_MGMT_NONE;
2196
2197         reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
2198         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2199         status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2200         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
2201
2202         sdata_info(sdata,
2203                    "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
2204                    reassoc ? "Rea" : "A", mgmt->sa,
2205                    capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
2206
2207         pos = mgmt->u.assoc_resp.variable;
2208         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
2209
2210         if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2211             elems.timeout_int && elems.timeout_int_len == 5 &&
2212             elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
2213                 u32 tu, ms;
2214                 tu = get_unaligned_le32(elems.timeout_int + 1);
2215                 ms = tu * 1024 / 1000;
2216                 sdata_info(sdata,
2217                            "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
2218                            mgmt->sa, tu, ms);
2219                 assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2220                 if (ms > IEEE80211_ASSOC_TIMEOUT)
2221                         run_again(ifmgd, assoc_data->timeout);
2222                 return RX_MGMT_NONE;
2223         }
2224
2225         *bss = assoc_data->bss;
2226
2227         if (status_code != WLAN_STATUS_SUCCESS) {
2228                 sdata_info(sdata, "%pM denied association (code=%d)\n",
2229                            mgmt->sa, status_code);
2230                 ieee80211_destroy_assoc_data(sdata, false);
2231         } else {
2232                 if (!ieee80211_assoc_success(sdata, *bss, mgmt, len)) {
2233                         /* oops -- internal error -- send timeout for now */
2234                         ieee80211_destroy_assoc_data(sdata, false);
2235                         cfg80211_put_bss(*bss);
2236                         return RX_MGMT_CFG80211_ASSOC_TIMEOUT;
2237                 }
2238                 sdata_info(sdata, "associated\n");
2239
2240                 /*
2241                  * destroy assoc_data afterwards, as otherwise an idle
2242                  * recalc after assoc_data is NULL but before associated
2243                  * is set can cause the interface to go idle
2244                  */
2245                 ieee80211_destroy_assoc_data(sdata, true);
2246         }
2247
2248         return RX_MGMT_CFG80211_RX_ASSOC;
2249 }
2250 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
2251                                   struct ieee80211_mgmt *mgmt,
2252                                   size_t len,
2253                                   struct ieee80211_rx_status *rx_status,
2254                                   struct ieee802_11_elems *elems,
2255                                   bool beacon)
2256 {
2257         struct ieee80211_local *local = sdata->local;
2258         int freq;
2259         struct ieee80211_bss *bss;
2260         struct ieee80211_channel *channel;
2261         bool need_ps = false;
2262
2263         if (sdata->u.mgd.associated &&
2264             ether_addr_equal(mgmt->bssid, sdata->u.mgd.associated->bssid)) {
2265                 bss = (void *)sdata->u.mgd.associated->priv;
2266                 /* not previously set so we may need to recalc */
2267                 need_ps = !bss->dtim_period;
2268         }
2269
2270         if (elems->ds_params && elems->ds_params_len == 1)
2271                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
2272                                                       rx_status->band);
2273         else
2274                 freq = rx_status->freq;
2275
2276         channel = ieee80211_get_channel(local->hw.wiphy, freq);
2277
2278         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
2279                 return;
2280
2281         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2282                                         channel, beacon);
2283         if (bss)
2284                 ieee80211_rx_bss_put(local, bss);
2285
2286         if (!sdata->u.mgd.associated)
2287                 return;
2288
2289         if (need_ps) {
2290                 mutex_lock(&local->iflist_mtx);
2291                 ieee80211_recalc_ps(local, -1);
2292                 mutex_unlock(&local->iflist_mtx);
2293         }
2294
2295         if (elems->ch_switch_ie &&
2296             memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
2297                 ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
2298                                                  bss, rx_status->mactime);
2299 }
2300
2301
2302 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
2303                                          struct sk_buff *skb)
2304 {
2305         struct ieee80211_mgmt *mgmt = (void *)skb->data;
2306         struct ieee80211_if_managed *ifmgd;
2307         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
2308         size_t baselen, len = skb->len;
2309         struct ieee802_11_elems elems;
2310
2311         ifmgd = &sdata->u.mgd;
2312
2313         ASSERT_MGD_MTX(ifmgd);
2314
2315         if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2316                 return; /* ignore ProbeResp to foreign address */
2317
2318         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
2319         if (baselen > len)
2320                 return;
2321
2322         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2323                                 &elems);
2324
2325         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
2326
2327         if (ifmgd->associated &&
2328             ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2329                 ieee80211_reset_ap_probe(sdata);
2330
2331         if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2332             ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
2333                 /* got probe response, continue with auth */
2334                 sdata_info(sdata, "direct probe responded\n");
2335                 ifmgd->auth_data->tries = 0;
2336                 ifmgd->auth_data->timeout = jiffies;
2337                 run_again(ifmgd, ifmgd->auth_data->timeout);
2338         }
2339 }
2340
2341 /*
2342  * This is the canonical list of information elements we care about,
2343  * the filter code also gives us all changes to the Microsoft OUI
2344  * (00:50:F2) vendor IE which is used for WMM which we need to track.
2345  *
2346  * We implement beacon filtering in software since that means we can
2347  * avoid processing the frame here and in cfg80211, and userspace
2348  * will not be able to tell whether the hardware supports it or not.
2349  *
2350  * XXX: This list needs to be dynamic -- userspace needs to be able to
2351  *      add items it requires. It also needs to be able to tell us to
2352  *      look out for other vendor IEs.
2353  */
2354 static const u64 care_about_ies =
2355         (1ULL << WLAN_EID_COUNTRY) |
2356         (1ULL << WLAN_EID_ERP_INFO) |
2357         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
2358         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
2359         (1ULL << WLAN_EID_HT_CAPABILITY) |
2360         (1ULL << WLAN_EID_HT_OPERATION);
2361
2362 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
2363                                      struct ieee80211_mgmt *mgmt,
2364                                      size_t len,
2365                                      struct ieee80211_rx_status *rx_status)
2366 {
2367         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2368         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2369         size_t baselen;
2370         struct ieee802_11_elems elems;
2371         struct ieee80211_local *local = sdata->local;
2372         u32 changed = 0;
2373         bool erp_valid, directed_tim = false;
2374         u8 erp_value = 0;
2375         u32 ncrc;
2376         u8 *bssid;
2377
2378         lockdep_assert_held(&ifmgd->mtx);
2379
2380         /* Process beacon from the current BSS */
2381         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
2382         if (baselen > len)
2383                 return;
2384
2385         if (rx_status->freq != local->oper_channel->center_freq)
2386                 return;
2387
2388         if (ifmgd->assoc_data && !ifmgd->assoc_data->have_beacon &&
2389             ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
2390                 ieee802_11_parse_elems(mgmt->u.beacon.variable,
2391                                        len - baselen, &elems);
2392
2393                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2394                                       false);
2395                 ifmgd->assoc_data->have_beacon = true;
2396                 ifmgd->assoc_data->sent_assoc = false;
2397                 /* continue assoc process */
2398                 ifmgd->assoc_data->timeout = jiffies;
2399                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2400                 return;
2401         }
2402
2403         if (!ifmgd->associated ||
2404             !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2405                 return;
2406         bssid = ifmgd->associated->bssid;
2407
2408         /* Track average RSSI from the Beacon frames of the current AP */
2409         ifmgd->last_beacon_signal = rx_status->signal;
2410         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
2411                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2412                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
2413                 ifmgd->last_cqm_event_signal = 0;
2414                 ifmgd->count_beacon_signal = 1;
2415                 ifmgd->last_ave_beacon_signal = 0;
2416         } else {
2417                 ifmgd->ave_beacon_signal =
2418                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
2419                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
2420                          ifmgd->ave_beacon_signal) / 16;
2421                 ifmgd->count_beacon_signal++;
2422         }
2423
2424         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
2425             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
2426                 int sig = ifmgd->ave_beacon_signal;
2427                 int last_sig = ifmgd->last_ave_beacon_signal;
2428
2429                 /*
2430                  * if signal crosses either of the boundaries, invoke callback
2431                  * with appropriate parameters
2432                  */
2433                 if (sig > ifmgd->rssi_max_thold &&
2434                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
2435                         ifmgd->last_ave_beacon_signal = sig;
2436                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
2437                 } else if (sig < ifmgd->rssi_min_thold &&
2438                            (last_sig >= ifmgd->rssi_max_thold ||
2439                            last_sig == 0)) {
2440                         ifmgd->last_ave_beacon_signal = sig;
2441                         drv_rssi_callback(local, RSSI_EVENT_LOW);
2442                 }
2443         }
2444
2445         if (bss_conf->cqm_rssi_thold &&
2446             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2447             !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2448                 int sig = ifmgd->ave_beacon_signal / 16;
2449                 int last_event = ifmgd->last_cqm_event_signal;
2450                 int thold = bss_conf->cqm_rssi_thold;
2451                 int hyst = bss_conf->cqm_rssi_hyst;
2452                 if (sig < thold &&
2453                     (last_event == 0 || sig < last_event - hyst)) {
2454                         ifmgd->last_cqm_event_signal = sig;
2455                         ieee80211_cqm_rssi_notify(
2456                                 &sdata->vif,
2457                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
2458                                 GFP_KERNEL);
2459                 } else if (sig > thold &&
2460                            (last_event == 0 || sig > last_event + hyst)) {
2461                         ifmgd->last_cqm_event_signal = sig;
2462                         ieee80211_cqm_rssi_notify(
2463                                 &sdata->vif,
2464                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
2465                                 GFP_KERNEL);
2466                 }
2467         }
2468
2469         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
2470                 mlme_dbg_ratelimited(sdata,
2471                                      "cancelling probereq poll due to a received beacon\n");
2472                 mutex_lock(&local->mtx);
2473                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
2474                 ieee80211_run_deferred_scan(local);
2475                 mutex_unlock(&local->mtx);
2476
2477                 mutex_lock(&local->iflist_mtx);
2478                 ieee80211_recalc_ps(local, -1);
2479                 mutex_unlock(&local->iflist_mtx);
2480         }
2481
2482         /*
2483          * Push the beacon loss detection into the future since
2484          * we are processing a beacon from the AP just now.
2485          */
2486         ieee80211_sta_reset_beacon_monitor(sdata);
2487
2488         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
2489         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2490                                           len - baselen, &elems,
2491                                           care_about_ies, ncrc);
2492
2493         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
2494                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
2495                                                    ifmgd->aid);
2496
2497         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2498                 if (directed_tim) {
2499                         if (local->hw.conf.dynamic_ps_timeout > 0) {
2500                                 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
2501                                         local->hw.conf.flags &= ~IEEE80211_CONF_PS;
2502                                         ieee80211_hw_config(local,
2503                                                             IEEE80211_CONF_CHANGE_PS);
2504                                 }
2505                                 ieee80211_send_nullfunc(local, sdata, 0);
2506                         } else if (!local->pspolling && sdata->u.mgd.powersave) {
2507                                 local->pspolling = true;
2508
2509                                 /*
2510                                  * Here is assumed that the driver will be
2511                                  * able to send ps-poll frame and receive a
2512                                  * response even though power save mode is
2513                                  * enabled, but some drivers might require
2514                                  * to disable power save here. This needs
2515                                  * to be investigated.
2516                                  */
2517                                 ieee80211_send_pspoll(local, sdata);
2518                         }
2519                 }
2520         }
2521
2522         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2523                 return;
2524         ifmgd->beacon_crc = ncrc;
2525         ifmgd->beacon_crc_valid = true;
2526
2527         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
2528                               true);
2529
2530         if (ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2531                                      elems.wmm_param_len))
2532                 changed |= BSS_CHANGED_QOS;
2533
2534         if (elems.erp_info && elems.erp_info_len >= 1) {
2535                 erp_valid = true;
2536                 erp_value = elems.erp_info[0];
2537         } else {
2538                 erp_valid = false;
2539         }
2540         changed |= ieee80211_handle_bss_capability(sdata,
2541                         le16_to_cpu(mgmt->u.beacon.capab_info),
2542                         erp_valid, erp_value);
2543
2544
2545         if (elems.ht_cap_elem && elems.ht_operation && elems.wmm_param &&
2546             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
2547                 struct ieee80211_supported_band *sband;
2548
2549                 sband = local->hw.wiphy->bands[local->oper_channel->band];
2550
2551                 changed |= ieee80211_config_ht_tx(sdata, elems.ht_operation,
2552                                                   bssid, true);
2553         }
2554
2555         if (elems.country_elem && elems.pwr_constr_elem &&
2556             mgmt->u.probe_resp.capab_info &
2557                                 cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
2558                 ieee80211_handle_pwr_constr(sdata, local->oper_channel,
2559                                             elems.country_elem,
2560                                             elems.country_elem_len,
2561                                             elems.pwr_constr_elem);
2562
2563         ieee80211_bss_info_change_notify(sdata, changed);
2564 }
2565
2566 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2567                                   struct sk_buff *skb)
2568 {
2569         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2570         struct ieee80211_rx_status *rx_status;
2571         struct ieee80211_mgmt *mgmt;
2572         struct cfg80211_bss *bss = NULL;
2573         enum rx_mgmt_action rma = RX_MGMT_NONE;
2574         u16 fc;
2575
2576         rx_status = (struct ieee80211_rx_status *) skb->cb;
2577         mgmt = (struct ieee80211_mgmt *) skb->data;
2578         fc = le16_to_cpu(mgmt->frame_control);
2579
2580         mutex_lock(&ifmgd->mtx);
2581
2582         switch (fc & IEEE80211_FCTL_STYPE) {
2583         case IEEE80211_STYPE_BEACON:
2584                 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
2585                 break;
2586         case IEEE80211_STYPE_PROBE_RESP:
2587                 ieee80211_rx_mgmt_probe_resp(sdata, skb);
2588                 break;
2589         case IEEE80211_STYPE_AUTH:
2590                 rma = ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
2591                 break;
2592         case IEEE80211_STYPE_DEAUTH:
2593                 rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2594                 break;
2595         case IEEE80211_STYPE_DISASSOC:
2596                 rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2597                 break;
2598         case IEEE80211_STYPE_ASSOC_RESP:
2599         case IEEE80211_STYPE_REASSOC_RESP:
2600                 rma = ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len, &bss);
2601                 break;
2602         case IEEE80211_STYPE_ACTION:
2603                 switch (mgmt->u.action.category) {
2604                 case WLAN_CATEGORY_SPECTRUM_MGMT:
2605                         ieee80211_sta_process_chanswitch(sdata,
2606                                         &mgmt->u.action.u.chan_switch.sw_elem,
2607                                         (void *)ifmgd->associated->priv,
2608                                         rx_status->mactime);
2609                         break;
2610                 }
2611         }
2612         mutex_unlock(&ifmgd->mtx);
2613
2614         switch (rma) {
2615         case RX_MGMT_NONE:
2616                 /* no action */
2617                 break;
2618         case RX_MGMT_CFG80211_DEAUTH:
2619                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2620                 break;
2621         case RX_MGMT_CFG80211_DISASSOC:
2622                 cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2623                 break;
2624         case RX_MGMT_CFG80211_RX_AUTH:
2625                 cfg80211_send_rx_auth(sdata->dev, (u8 *)mgmt, skb->len);
2626                 break;
2627         case RX_MGMT_CFG80211_RX_ASSOC:
2628                 cfg80211_send_rx_assoc(sdata->dev, bss, (u8 *)mgmt, skb->len);
2629                 break;
2630         case RX_MGMT_CFG80211_ASSOC_TIMEOUT:
2631                 cfg80211_send_assoc_timeout(sdata->dev, mgmt->bssid);
2632                 break;
2633         default:
2634                 WARN(1, "unexpected: %d", rma);
2635         }
2636 }
2637
2638 static void ieee80211_sta_timer(unsigned long data)
2639 {
2640         struct ieee80211_sub_if_data *sdata =
2641                 (struct ieee80211_sub_if_data *) data;
2642         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2643         struct ieee80211_local *local = sdata->local;
2644
2645         if (local->quiescing) {
2646                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2647                 return;
2648         }
2649
2650         ieee80211_queue_work(&local->hw, &sdata->work);
2651 }
2652
2653 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2654                                           u8 *bssid, u8 reason)
2655 {
2656         struct ieee80211_local *local = sdata->local;
2657         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2658         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2659
2660         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
2661                                false, frame_buf);
2662         mutex_unlock(&ifmgd->mtx);
2663
2664         /*
2665          * must be outside lock due to cfg80211,
2666          * but that's not a problem.
2667          */
2668         cfg80211_send_deauth(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);
2669
2670         mutex_lock(&local->mtx);
2671         ieee80211_recalc_idle(local);
2672         mutex_unlock(&local->mtx);
2673
2674         mutex_lock(&ifmgd->mtx);
2675 }
2676
2677 static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
2678 {
2679         struct ieee80211_local *local = sdata->local;
2680         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2681         struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
2682
2683         lockdep_assert_held(&ifmgd->mtx);
2684
2685         if (WARN_ON_ONCE(!auth_data))
2686                 return -EINVAL;
2687
2688         auth_data->tries++;
2689
2690         if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
2691                 sdata_info(sdata, "authentication with %pM timed out\n",
2692                            auth_data->bss->bssid);
2693
2694                 /*
2695                  * Most likely AP is not in the range so remove the
2696                  * bss struct for that AP.
2697                  */
2698                 cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);
2699
2700                 return -ETIMEDOUT;
2701         }
2702
2703         drv_mgd_prepare_tx(local, sdata);
2704
2705         if (auth_data->bss->proberesp_ies) {
2706                 sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
2707                            auth_data->bss->bssid, auth_data->tries,
2708                            IEEE80211_AUTH_MAX_TRIES);
2709
2710                 auth_data->expected_transaction = 2;
2711                 ieee80211_send_auth(sdata, 1, auth_data->algorithm,
2712                                     auth_data->ie, auth_data->ie_len,
2713                                     auth_data->bss->bssid,
2714                                     auth_data->bss->bssid, NULL, 0, 0);
2715         } else {
2716                 const u8 *ssidie;
2717
2718                 sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
2719                            auth_data->bss->bssid, auth_data->tries,
2720                            IEEE80211_AUTH_MAX_TRIES);
2721
2722                 ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
2723                 if (!ssidie)
2724                         return -EINVAL;
2725                 /*
2726                  * Direct probe is sent to broadcast address as some APs
2727                  * will not answer to direct packet in unassociated state.
2728                  */
2729                 ieee80211_send_probe_req(sdata, NULL, ssidie + 2, ssidie[1],
2730                                          NULL, 0, (u32) -1, true, false,
2731                                          auth_data->bss->channel);
2732         }
2733
2734         auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
2735         run_again(ifmgd, auth_data->timeout);
2736
2737         return 0;
2738 }
2739
2740 static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
2741 {
2742         struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
2743         struct ieee80211_local *local = sdata->local;
2744
2745         lockdep_assert_held(&sdata->u.mgd.mtx);
2746
2747         assoc_data->tries++;
2748         if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
2749                 sdata_info(sdata, "association with %pM timed out\n",
2750                            assoc_data->bss->bssid);
2751
2752                 /*
2753                  * Most likely AP is not in the range so remove the
2754                  * bss struct for that AP.
2755                  */
2756                 cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);
2757
2758                 return -ETIMEDOUT;
2759         }
2760
2761         sdata_info(sdata, "associate with %pM (try %d/%d)\n",
2762                    assoc_data->bss->bssid, assoc_data->tries,
2763                    IEEE80211_ASSOC_MAX_TRIES);
2764         ieee80211_send_assoc(sdata);
2765
2766         assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
2767         run_again(&sdata->u.mgd, assoc_data->timeout);
2768
2769         return 0;
2770 }
2771
2772 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2773 {
2774         struct ieee80211_local *local = sdata->local;
2775         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2776
2777         mutex_lock(&ifmgd->mtx);
2778
2779         if (ifmgd->auth_data &&
2780             time_after(jiffies, ifmgd->auth_data->timeout)) {
2781                 if (ifmgd->auth_data->done) {
2782                         /*
2783                          * ok ... we waited for assoc but userspace didn't,
2784                          * so let's just kill the auth data
2785                          */
2786                         ieee80211_destroy_auth_data(sdata, false);
2787                 } else if (ieee80211_probe_auth(sdata)) {
2788                         u8 bssid[ETH_ALEN];
2789
2790                         memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);
2791
2792                         ieee80211_destroy_auth_data(sdata, false);
2793
2794                         mutex_unlock(&ifmgd->mtx);
2795                         cfg80211_send_auth_timeout(sdata->dev, bssid);
2796                         mutex_lock(&ifmgd->mtx);
2797                 }
2798         } else if (ifmgd->auth_data)
2799                 run_again(ifmgd, ifmgd->auth_data->timeout);
2800
2801         if (ifmgd->assoc_data &&
2802             time_after(jiffies, ifmgd->assoc_data->timeout)) {
2803                 if (!ifmgd->assoc_data->have_beacon ||
2804                     ieee80211_do_assoc(sdata)) {
2805                         u8 bssid[ETH_ALEN];
2806
2807                         memcpy(bssid, ifmgd->assoc_data->bss->bssid, ETH_ALEN);
2808
2809                         ieee80211_destroy_assoc_data(sdata, false);
2810
2811                         mutex_unlock(&ifmgd->mtx);
2812                         cfg80211_send_assoc_timeout(sdata->dev, bssid);
2813                         mutex_lock(&ifmgd->mtx);
2814                 }
2815         } else if (ifmgd->assoc_data)
2816                 run_again(ifmgd, ifmgd->assoc_data->timeout);
2817
2818         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2819                             IEEE80211_STA_CONNECTION_POLL) &&
2820             ifmgd->associated) {
2821                 u8 bssid[ETH_ALEN];
2822                 int max_tries;
2823
2824                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2825
2826                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2827                         max_tries = max_nullfunc_tries;
2828                 else
2829                         max_tries = max_probe_tries;
2830
2831                 /* ACK received for nullfunc probing frame */
2832                 if (!ifmgd->probe_send_count)
2833                         ieee80211_reset_ap_probe(sdata);
2834                 else if (ifmgd->nullfunc_failed) {
2835                         if (ifmgd->probe_send_count < max_tries) {
2836                                 mlme_dbg(sdata,
2837                                          "No ack for nullfunc frame to AP %pM, try %d/%i\n",
2838                                          bssid, ifmgd->probe_send_count,
2839                                          max_tries);
2840                                 ieee80211_mgd_probe_ap_send(sdata);
2841                         } else {
2842                                 mlme_dbg(sdata,
2843                                          "No ack for nullfunc frame to AP %pM, disconnecting.\n",
2844                                          bssid);
2845                                 ieee80211_sta_connection_lost(sdata, bssid,
2846                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2847                         }
2848                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2849                         run_again(ifmgd, ifmgd->probe_timeout);
2850                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2851                         mlme_dbg(sdata,
2852                                  "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
2853                                  bssid, probe_wait_ms);
2854                         ieee80211_sta_connection_lost(sdata, bssid,
2855                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2856                 } else if (ifmgd->probe_send_count < max_tries) {
2857                         mlme_dbg(sdata,
2858                                  "No probe response from AP %pM after %dms, try %d/%i\n",
2859                                  bssid, probe_wait_ms,
2860                                  ifmgd->probe_send_count, max_tries);
2861                         ieee80211_mgd_probe_ap_send(sdata);
2862                 } else {
2863                         /*
2864                          * We actually lost the connection ... or did we?
2865                          * Let's make sure!
2866                          */
2867                         wiphy_debug(local->hw.wiphy,
2868                                     "%s: No probe response from AP %pM"
2869                                     " after %dms, disconnecting.\n",
2870                                     sdata->name,
2871                                     bssid, probe_wait_ms);
2872
2873                         ieee80211_sta_connection_lost(sdata, bssid,
2874                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2875                 }
2876         }
2877
2878         mutex_unlock(&ifmgd->mtx);
2879
2880         mutex_lock(&local->mtx);
2881         ieee80211_recalc_idle(local);
2882         mutex_unlock(&local->mtx);
2883 }
2884
2885 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2886 {
2887         struct ieee80211_sub_if_data *sdata =
2888                 (struct ieee80211_sub_if_data *) data;
2889         struct ieee80211_local *local = sdata->local;
2890
2891         if (local->quiescing)
2892                 return;
2893
2894         ieee80211_queue_work(&sdata->local->hw,
2895                              &sdata->u.mgd.beacon_connection_loss_work);
2896 }
2897
2898 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2899 {
2900         struct ieee80211_sub_if_data *sdata =
2901                 (struct ieee80211_sub_if_data *) data;
2902         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2903         struct ieee80211_local *local = sdata->local;
2904
2905         if (local->quiescing)
2906                 return;
2907
2908         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2909 }
2910
2911 static void ieee80211_sta_monitor_work(struct work_struct *work)
2912 {
2913         struct ieee80211_sub_if_data *sdata =
2914                 container_of(work, struct ieee80211_sub_if_data,
2915                              u.mgd.monitor_work);
2916
2917         ieee80211_mgd_probe_ap(sdata, false);
2918 }
2919
2920 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2921 {
2922         u32 flags;
2923
2924         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2925                 __ieee80211_stop_poll(sdata);
2926
2927                 /* let's probe the connection once */
2928                 flags = sdata->local->hw.flags;
2929                 if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
2930                         ieee80211_queue_work(&sdata->local->hw,
2931                                              &sdata->u.mgd.monitor_work);
2932                 /* and do all the other regular work too */
2933                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2934         }
2935 }
2936
2937 #ifdef CONFIG_PM
2938 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2939 {
2940         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2941
2942         /*
2943          * we need to use atomic bitops for the running bits
2944          * only because both timers might fire at the same
2945          * time -- the code here is properly synchronised.
2946          */
2947
2948         cancel_work_sync(&ifmgd->request_smps_work);
2949
2950         cancel_work_sync(&ifmgd->monitor_work);
2951         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2952         cancel_work_sync(&ifmgd->csa_connection_drop_work);
2953         if (del_timer_sync(&ifmgd->timer))
2954                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2955
2956         cancel_work_sync(&ifmgd->chswitch_work);
2957         if (del_timer_sync(&ifmgd->chswitch_timer))
2958                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2959
2960         /* these will just be re-established on connection */
2961         del_timer_sync(&ifmgd->conn_mon_timer);
2962         del_timer_sync(&ifmgd->bcn_mon_timer);
2963 }
2964
2965 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2966 {
2967         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2968
2969         if (!ifmgd->associated)
2970                 return;
2971
2972         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2973                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2974                 mutex_lock(&ifmgd->mtx);
2975                 if (ifmgd->associated) {
2976                         mlme_dbg(sdata,
2977                                  "driver requested disconnect after resume\n");
2978                         ieee80211_sta_connection_lost(sdata,
2979                                 ifmgd->associated->bssid,
2980                                 WLAN_REASON_UNSPECIFIED);
2981                         mutex_unlock(&ifmgd->mtx);
2982                         return;
2983                 }
2984                 mutex_unlock(&ifmgd->mtx);
2985         }
2986
2987         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2988                 add_timer(&ifmgd->timer);
2989         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2990                 add_timer(&ifmgd->chswitch_timer);
2991         ieee80211_sta_reset_beacon_monitor(sdata);
2992
2993         mutex_lock(&sdata->local->mtx);
2994         ieee80211_restart_sta_timer(sdata);
2995         mutex_unlock(&sdata->local->mtx);
2996 }
2997 #endif
2998
2999 /* interface setup */
3000 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3001 {
3002         struct ieee80211_if_managed *ifmgd;
3003
3004         ifmgd = &sdata->u.mgd;
3005         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3006         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3007         INIT_WORK(&ifmgd->beacon_connection_loss_work,
3008                   ieee80211_beacon_connection_loss_work);
3009         INIT_WORK(&ifmgd->csa_connection_drop_work,
3010                   ieee80211_csa_connection_drop_work);
3011         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
3012         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
3013                     (unsigned long) sdata);
3014         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
3015                     (unsigned long) sdata);
3016         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
3017                     (unsigned long) sdata);
3018         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
3019                     (unsigned long) sdata);
3020
3021         ifmgd->flags = 0;
3022         ifmgd->powersave = sdata->wdev.ps;
3023         ifmgd->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
3024         ifmgd->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
3025
3026         mutex_init(&ifmgd->mtx);
3027
3028         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
3029                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
3030         else
3031                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
3032 }
3033
3034 /* scan finished notification */
3035 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
3036 {
3037         struct ieee80211_sub_if_data *sdata;
3038
3039         /* Restart STA timers */
3040         rcu_read_lock();
3041         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3042                 ieee80211_restart_sta_timer(sdata);
3043         rcu_read_unlock();
3044 }
3045
3046 int ieee80211_max_network_latency(struct notifier_block *nb,
3047                                   unsigned long data, void *dummy)
3048 {
3049         s32 latency_usec = (s32) data;
3050         struct ieee80211_local *local =
3051                 container_of(nb, struct ieee80211_local,
3052                              network_latency_notifier);
3053
3054         mutex_lock(&local->iflist_mtx);
3055         ieee80211_recalc_ps(local, latency_usec);
3056         mutex_unlock(&local->iflist_mtx);
3057
3058         return 0;
3059 }
3060
3061 static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
3062                                   struct cfg80211_bss *cbss)
3063 {
3064         struct ieee80211_local *local = sdata->local;
3065         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3066         int ht_cfreq;
3067         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
3068         const u8 *ht_oper_ie;
3069         const struct ieee80211_ht_operation *ht_oper = NULL;
3070         struct ieee80211_supported_band *sband;
3071
3072         sband = local->hw.wiphy->bands[cbss->channel->band];
3073
3074         ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
3075
3076         if (sband->ht_cap.ht_supported) {
3077                 ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
3078                                               cbss->information_elements,
3079                                               cbss->len_information_elements);
3080                 if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
3081                         ht_oper = (void *)(ht_oper_ie + 2);
3082         }
3083
3084         if (ht_oper) {
3085                 ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
3086                                                           cbss->channel->band);
3087                 /* check that channel matches the right operating channel */
3088                 if (cbss->channel->center_freq != ht_cfreq) {
3089                         /*
3090                          * It's possible that some APs are confused here;
3091                          * Netgear WNDR3700 sometimes reports 4 higher than
3092                          * the actual channel in association responses, but
3093                          * since we look at probe response/beacon data here
3094                          * it should be OK.
3095                          */
3096                         sdata_info(sdata,
3097                                    "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
3098                                    cbss->channel->center_freq,
3099                                    ht_cfreq, ht_oper->primary_chan,
3100                                    cbss->channel->band);
3101                         ht_oper = NULL;
3102                 }
3103         }
3104
3105         if (ht_oper) {
3106                 channel_type = NL80211_CHAN_HT20;
3107
3108                 if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
3109                         switch (ht_oper->ht_param &
3110                                         IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
3111                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
3112                                 channel_type = NL80211_CHAN_HT40PLUS;
3113                                 break;
3114                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
3115                                 channel_type = NL80211_CHAN_HT40MINUS;
3116                                 break;
3117                         }
3118                 }
3119         }
3120
3121         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
3122                 /* can only fail due to HT40+/- mismatch */
3123                 channel_type = NL80211_CHAN_HT20;
3124                 sdata_info(sdata,
3125                            "disabling 40 MHz due to multi-vif mismatch\n");
3126                 ifmgd->flags |= IEEE80211_STA_DISABLE_40MHZ;
3127                 WARN_ON(!ieee80211_set_channel_type(local, sdata,
3128                                                     channel_type));
3129         }
3130
3131         local->oper_channel = cbss->channel;
3132         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
3133
3134         return 0;
3135 }
3136
3137 static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
3138                                      struct cfg80211_bss *cbss, bool assoc)
3139 {
3140         struct ieee80211_local *local = sdata->local;
3141         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3142         struct ieee80211_bss *bss = (void *)cbss->priv;
3143         struct sta_info *new_sta = NULL;
3144         bool have_sta = false;
3145         int err;
3146
3147         if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
3148                 return -EINVAL;
3149
3150         if (assoc) {
3151                 rcu_read_lock();
3152                 have_sta = sta_info_get(sdata, cbss->bssid);
3153                 rcu_read_unlock();
3154         }
3155
3156         if (!have_sta) {
3157                 new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
3158                 if (!new_sta)
3159                         return -ENOMEM;
3160         }
3161
3162         mutex_lock(&local->mtx);
3163         ieee80211_recalc_idle(sdata->local);
3164         mutex_unlock(&local->mtx);
3165
3166         if (new_sta) {
3167                 u32 rates = 0, basic_rates = 0;
3168                 bool have_higher_than_11mbit;
3169                 int min_rate = INT_MAX, min_rate_index = -1;
3170                 struct ieee80211_supported_band *sband;
3171
3172                 sband = local->hw.wiphy->bands[cbss->channel->band];
3173
3174                 err = ieee80211_prep_channel(sdata, cbss);
3175                 if (err) {
3176                         sta_info_free(local, new_sta);
3177                         return err;
3178                 }
3179
3180                 ieee80211_get_rates(sband, bss->supp_rates,
3181                                     bss->supp_rates_len,
3182                                     &rates, &basic_rates,
3183                                     &have_higher_than_11mbit,
3184                                     &min_rate, &min_rate_index);
3185
3186                 /*
3187                  * This used to be a workaround for basic rates missing
3188                  * in the association response frame. Now that we no
3189                  * longer use the basic rates from there, it probably
3190                  * doesn't happen any more, but keep the workaround so
3191                  * in case some *other* APs are buggy in different ways
3192                  * we can connect -- with a warning.
3193                  */
3194                 if (!basic_rates && min_rate_index >= 0) {
3195                         sdata_info(sdata,
3196                                    "No basic rates, using min rate instead\n");
3197                         basic_rates = BIT(min_rate_index);
3198                 }
3199
3200                 new_sta->sta.supp_rates[cbss->channel->band] = rates;
3201                 sdata->vif.bss_conf.basic_rates = basic_rates;
3202
3203                 /* cf. IEEE 802.11 9.2.12 */
3204                 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
3205                     have_higher_than_11mbit)
3206                         sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
3207                 else
3208                         sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
3209
3210                 memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);
3211
3212                 /* set timing information */
3213                 sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
3214                 sdata->vif.bss_conf.sync_tsf = cbss->tsf;
3215                 sdata->vif.bss_conf.sync_device_ts = bss->device_ts;
3216
3217                 /* tell driver about BSSID, basic rates and timing */
3218                 ieee80211_bss_info_change_notify(sdata,
3219                         BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
3220                         BSS_CHANGED_BEACON_INT);
3221
3222                 if (assoc)
3223                         sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3224
3225                 err = sta_info_insert(new_sta);
3226                 new_sta = NULL;
3227                 if (err) {
3228                         sdata_info(sdata,
3229                                    "failed to insert STA entry for the AP (error %d)\n",
3230                                    err);
3231                         return err;
3232                 }
3233         } else
3234                 WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3235
3236         return 0;
3237 }
3238
3239 /* config hooks */
3240 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
3241                        struct cfg80211_auth_request *req)
3242 {
3243         struct ieee80211_local *local = sdata->local;
3244         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3245         struct ieee80211_mgd_auth_data *auth_data;
3246         u16 auth_alg;
3247         int err;
3248
3249         /* prepare auth data structure */
3250
3251         switch (req->auth_type) {
3252         case NL80211_AUTHTYPE_OPEN_SYSTEM:
3253                 auth_alg = WLAN_AUTH_OPEN;
3254                 break;
3255         case NL80211_AUTHTYPE_SHARED_KEY:
3256                 if (IS_ERR(local->wep_tx_tfm))
3257                         return -EOPNOTSUPP;
3258                 auth_alg = WLAN_AUTH_SHARED_KEY;
3259                 break;
3260         case NL80211_AUTHTYPE_FT:
3261                 auth_alg = WLAN_AUTH_FT;
3262                 break;
3263         case NL80211_AUTHTYPE_NETWORK_EAP:
3264                 auth_alg = WLAN_AUTH_LEAP;
3265                 break;
3266         default:
3267                 return -EOPNOTSUPP;
3268         }
3269
3270         auth_data = kzalloc(sizeof(*auth_data) + req->ie_len, GFP_KERNEL);
3271         if (!auth_data)
3272                 return -ENOMEM;
3273
3274         auth_data->bss = req->bss;
3275
3276         if (req->ie && req->ie_len) {
3277                 memcpy(auth_data->ie, req->ie, req->ie_len);
3278                 auth_data->ie_len = req->ie_len;
3279         }
3280
3281         if (req->key && req->key_len) {
3282                 auth_data->key_len = req->key_len;
3283                 auth_data->key_idx = req->key_idx;
3284                 memcpy(auth_data->key, req->key, req->key_len);
3285         }
3286
3287         auth_data->algorithm = auth_alg;
3288
3289         /* try to authenticate/probe */
3290
3291         mutex_lock(&ifmgd->mtx);
3292
3293         if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
3294             ifmgd->assoc_data) {
3295                 err = -EBUSY;
3296                 goto err_free;
3297         }
3298
3299         if (ifmgd->auth_data)
3300                 ieee80211_destroy_auth_data(sdata, false);
3301
3302         /* prep auth_data so we don't go into idle on disassoc */
3303         ifmgd->auth_data = auth_data;
3304
3305         if (ifmgd->associated)
3306                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3307
3308         sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3309
3310         err = ieee80211_prep_connection(sdata, req->bss, false);
3311         if (err)
3312                 goto err_clear;
3313
3314         err = ieee80211_probe_auth(sdata);
3315         if (err) {
3316                 sta_info_destroy_addr(sdata, req->bss->bssid);
3317                 goto err_clear;
3318         }
3319
3320         /* hold our own reference */
3321         cfg80211_ref_bss(auth_data->bss);
3322         err = 0;
3323         goto out_unlock;
3324
3325  err_clear:
3326         memset(ifmgd->bssid, 0, ETH_ALEN);
3327         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3328         ifmgd->auth_data = NULL;
3329  err_free:
3330         kfree(auth_data);
3331  out_unlock:
3332         mutex_unlock(&ifmgd->mtx);
3333
3334         return err;
3335 }
3336
3337 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
3338                         struct cfg80211_assoc_request *req)
3339 {
3340         struct ieee80211_local *local = sdata->local;
3341         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3342         struct ieee80211_bss *bss = (void *)req->bss->priv;
3343         struct ieee80211_mgd_assoc_data *assoc_data;
3344         struct ieee80211_supported_band *sband;
3345         const u8 *ssidie, *ht_ie;
3346         int i, err;
3347
3348         ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
3349         if (!ssidie)
3350                 return -EINVAL;
3351
3352         assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
3353         if (!assoc_data)
3354                 return -ENOMEM;
3355
3356         mutex_lock(&ifmgd->mtx);
3357
3358         if (ifmgd->associated)
3359                 ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
3360
3361         if (ifmgd->auth_data && !ifmgd->auth_data->done) {
3362                 err = -EBUSY;
3363                 goto err_free;
3364         }
3365
3366         if (ifmgd->assoc_data) {
3367                 err = -EBUSY;
3368                 goto err_free;
3369         }
3370
3371         if (ifmgd->auth_data) {
3372                 bool match;
3373
3374                 /* keep sta info, bssid if matching */
3375                 match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
3376                 ieee80211_destroy_auth_data(sdata, match);
3377         }
3378
3379         /* prepare assoc data */
3380
3381         /*
3382          * keep only the 40 MHz disable bit set as it might have
3383          * been set during authentication already, all other bits
3384          * should be reset for a new connection
3385          */
3386         ifmgd->flags &= IEEE80211_STA_DISABLE_40MHZ;
3387
3388         ifmgd->beacon_crc_valid = false;
3389
3390         /*
3391          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
3392          * We still associate in non-HT mode (11a/b/g) if any one of these
3393          * ciphers is configured as pairwise.
3394          * We can set this to true for non-11n hardware, that'll be checked
3395          * separately along with the peer capabilities.
3396          */
3397         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
3398                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
3399                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
3400                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
3401                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3402                         ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3403                         netdev_info(sdata->dev,
3404                                     "disabling HT/VHT due to WEP/TKIP use\n");
3405                 }
3406         }
3407
3408         if (req->flags & ASSOC_REQ_DISABLE_HT) {
3409                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3410                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3411         }
3412
3413         /* Also disable HT if we don't support it or the AP doesn't use WMM */
3414         sband = local->hw.wiphy->bands[req->bss->channel->band];
3415         if (!sband->ht_cap.ht_supported ||
3416             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3417                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3418                 if (!bss->wmm_used)
3419                         netdev_info(sdata->dev,
3420                                     "disabling HT as WMM/QoS is not supported by the AP\n");
3421         }
3422
3423         /* disable VHT if we don't support it or the AP doesn't use WMM */
3424         if (!sband->vht_cap.vht_supported ||
3425             local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used) {
3426                 ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3427                 if (!bss->wmm_used)
3428                         netdev_info(sdata->dev,
3429                                     "disabling VHT as WMM/QoS is not supported by the AP\n");
3430         }
3431
3432         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
3433         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
3434                sizeof(ifmgd->ht_capa_mask));
3435
3436         if (req->ie && req->ie_len) {
3437                 memcpy(assoc_data->ie, req->ie, req->ie_len);
3438                 assoc_data->ie_len = req->ie_len;
3439         }
3440
3441         assoc_data->bss = req->bss;
3442
3443         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
3444                 if (ifmgd->powersave)
3445                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
3446                 else
3447                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
3448         } else
3449                 ifmgd->ap_smps = ifmgd->req_smps;
3450
3451         assoc_data->capability = req->bss->capability;
3452         assoc_data->wmm = bss->wmm_used &&
3453                           (local->hw.queues >= IEEE80211_NUM_ACS);
3454         assoc_data->supp_rates = bss->supp_rates;
3455         assoc_data->supp_rates_len = bss->supp_rates_len;
3456
3457         ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
3458         if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
3459                 assoc_data->ap_ht_param =
3460                         ((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
3461         else
3462                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
3463
3464         if (bss->wmm_used && bss->uapsd_supported &&
3465             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
3466                 assoc_data->uapsd = true;
3467                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
3468         } else {
3469                 assoc_data->uapsd = false;
3470                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
3471         }
3472
3473         memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
3474         assoc_data->ssid_len = ssidie[1];
3475
3476         if (req->prev_bssid)
3477                 memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
3478
3479         if (req->use_mfp) {
3480                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
3481                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
3482         } else {
3483                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
3484                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
3485         }
3486
3487         if (req->crypto.control_port)
3488                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
3489         else
3490                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
3491
3492         sdata->control_port_protocol = req->crypto.control_port_ethertype;
3493         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
3494
3495         /* kick off associate process */
3496
3497         ifmgd->assoc_data = assoc_data;
3498
3499         err = ieee80211_prep_connection(sdata, req->bss, true);
3500         if (err)
3501                 goto err_clear;
3502
3503         if (!bss->dtim_period &&
3504             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD) {
3505                 /*
3506                  * Wait up to one beacon interval ...
3507                  * should this be more if we miss one?
3508                  */
3509                 sdata_info(sdata, "waiting for beacon from %pM\n",
3510                            ifmgd->bssid);
3511                 assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
3512         } else {
3513                 assoc_data->have_beacon = true;
3514                 assoc_data->sent_assoc = false;
3515                 assoc_data->timeout = jiffies;
3516         }
3517         run_again(ifmgd, assoc_data->timeout);
3518
3519         if (bss->corrupt_data) {
3520                 char *corrupt_type = "data";
3521                 if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
3522                         if (bss->corrupt_data &
3523                                         IEEE80211_BSS_CORRUPT_PROBE_RESP)
3524                                 corrupt_type = "beacon and probe response";
3525                         else
3526                                 corrupt_type = "beacon";
3527                 } else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
3528                         corrupt_type = "probe response";
3529                 sdata_info(sdata, "associating with AP with corrupt %s\n",
3530                            corrupt_type);
3531         }
3532
3533         err = 0;
3534         goto out;
3535  err_clear:
3536         memset(ifmgd->bssid, 0, ETH_ALEN);
3537         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
3538         ifmgd->assoc_data = NULL;
3539  err_free:
3540         kfree(assoc_data);
3541  out:
3542         mutex_unlock(&ifmgd->mtx);
3543
3544         return err;
3545 }
3546
3547 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
3548                          struct cfg80211_deauth_request *req)
3549 {
3550         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3551         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3552
3553         mutex_lock(&ifmgd->mtx);
3554
3555         if (ifmgd->auth_data) {
3556                 ieee80211_destroy_auth_data(sdata, false);
3557                 mutex_unlock(&ifmgd->mtx);
3558                 return 0;
3559         }
3560
3561         sdata_info(sdata,
3562                    "deauthenticating from %pM by local choice (reason=%d)\n",
3563                    req->bssid, req->reason_code);
3564
3565         if (ifmgd->associated &&
3566             ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
3567                 ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
3568                                        req->reason_code, true, frame_buf);
3569         } else {
3570                 drv_mgd_prepare_tx(sdata->local, sdata);
3571                 ieee80211_send_deauth_disassoc(sdata, req->bssid,
3572                                                IEEE80211_STYPE_DEAUTH,
3573                                                req->reason_code, true,
3574                                                frame_buf);
3575         }
3576
3577         mutex_unlock(&ifmgd->mtx);
3578
3579         __cfg80211_send_deauth(sdata->dev, frame_buf,
3580                                IEEE80211_DEAUTH_FRAME_LEN);
3581
3582         mutex_lock(&sdata->local->mtx);
3583         ieee80211_recalc_idle(sdata->local);
3584         mutex_unlock(&sdata->local->mtx);
3585
3586         return 0;
3587 }
3588
3589 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
3590                            struct cfg80211_disassoc_request *req)
3591 {
3592         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3593         u8 bssid[ETH_ALEN];
3594         u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3595
3596         mutex_lock(&ifmgd->mtx);
3597
3598         /*
3599          * cfg80211 should catch this ... but it's racy since
3600          * we can receive a disassoc frame, process it, hand it
3601          * to cfg80211 while that's in a locked section already
3602          * trying to tell us that the user wants to disconnect.
3603          */
3604         if (ifmgd->associated != req->bss) {
3605                 mutex_unlock(&ifmgd->mtx);
3606                 return -ENOLINK;
3607         }
3608
3609         sdata_info(sdata,
3610                    "disassociating from %pM by local choice (reason=%d)\n",
3611                    req->bss->bssid, req->reason_code);
3612
3613         memcpy(bssid, req->bss->bssid, ETH_ALEN);
3614         ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
3615                                req->reason_code, !req->local_state_change,
3616                                frame_buf);
3617         mutex_unlock(&ifmgd->mtx);
3618
3619         __cfg80211_send_disassoc(sdata->dev, frame_buf,
3620                                  IEEE80211_DEAUTH_FRAME_LEN);
3621
3622         mutex_lock(&sdata->local->mtx);
3623         ieee80211_recalc_idle(sdata->local);
3624         mutex_unlock(&sdata->local->mtx);
3625
3626         return 0;
3627 }
3628
3629 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
3630 {
3631         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3632
3633         mutex_lock(&ifmgd->mtx);
3634         if (ifmgd->assoc_data)
3635                 ieee80211_destroy_assoc_data(sdata, false);
3636         if (ifmgd->auth_data)
3637                 ieee80211_destroy_auth_data(sdata, false);
3638         del_timer_sync(&ifmgd->timer);
3639         mutex_unlock(&ifmgd->mtx);
3640 }
3641
3642 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
3643                                enum nl80211_cqm_rssi_threshold_event rssi_event,
3644                                gfp_t gfp)
3645 {
3646         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3647
3648         trace_api_cqm_rssi_notify(sdata, rssi_event);
3649
3650         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
3651 }
3652 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);